Commit | Line | Data |
---|---|---|
923a654c | 1 | #include <linux/bitmap.h> |
d2876d08 DB |
2 | #include <linux/kernel.h> |
3 | #include <linux/module.h> | |
ff77c352 | 4 | #include <linux/interrupt.h> |
d2876d08 DB |
5 | #include <linux/irq.h> |
6 | #include <linux/spinlock.h> | |
1a989d0f | 7 | #include <linux/list.h> |
d8f388d8 DB |
8 | #include <linux/device.h> |
9 | #include <linux/err.h> | |
10 | #include <linux/debugfs.h> | |
11 | #include <linux/seq_file.h> | |
12 | #include <linux/gpio.h> | |
391c970c | 13 | #include <linux/of_gpio.h> |
ff77c352 | 14 | #include <linux/idr.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
7b199811 | 16 | #include <linux/acpi.h> |
53e7cac3 | 17 | #include <linux/gpio/driver.h> |
0a6d3158 | 18 | #include <linux/gpio/machine.h> |
c771c2f4 | 19 | #include <linux/pinctrl/consumer.h> |
3c702e99 LW |
20 | #include <linux/cdev.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/uaccess.h> | |
8b92e17e | 23 | #include <linux/compat.h> |
d7c51b47 | 24 | #include <linux/anon_inodes.h> |
953b956a | 25 | #include <linux/file.h> |
61f922db LW |
26 | #include <linux/kfifo.h> |
27 | #include <linux/poll.h> | |
28 | #include <linux/timekeeping.h> | |
3c702e99 | 29 | #include <uapi/linux/gpio.h> |
d2876d08 | 30 | |
664e3e5a MW |
31 | #include "gpiolib.h" |
32 | ||
3f397c21 UKK |
33 | #define CREATE_TRACE_POINTS |
34 | #include <trace/events/gpio.h> | |
d2876d08 | 35 | |
79a9becd | 36 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 37 | * |
79a9becd AC |
38 | * The GPIO programming interface allows for inlining speed-critical |
39 | * get/set operations for common cases, so that access to SOC-integrated | |
40 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
41 | */ |
42 | ||
43 | ||
44 | /* When debugging, extend minimal trust to callers and platform code. | |
45 | * Also emit diagnostic messages that may help initial bringup, when | |
46 | * board setup or driver bugs are most common. | |
47 | * | |
48 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
49 | */ | |
50 | #ifdef DEBUG | |
51 | #define extra_checks 1 | |
52 | #else | |
53 | #define extra_checks 0 | |
54 | #endif | |
55 | ||
ff2b1359 LW |
56 | /* Device and char device-related information */ |
57 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
58 | static dev_t gpio_devt; |
59 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
60 | static struct bus_type gpio_bus_type = { | |
61 | .name = "gpio", | |
62 | }; | |
ff2b1359 | 63 | |
3027743f LA |
64 | /* |
65 | * Number of GPIOs to use for the fast path in set array | |
66 | */ | |
67 | #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT | |
68 | ||
d2876d08 DB |
69 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
70 | * While any GPIO is requested, its gpio_chip is not removable; | |
71 | * each GPIO's "requested" flag serves as a lock and refcount. | |
72 | */ | |
0eb4c6c2 | 73 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 74 | |
bae48da2 AC |
75 | static DEFINE_MUTEX(gpio_lookup_lock); |
76 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 77 | LIST_HEAD(gpio_devices); |
6d86750c | 78 | |
a411e81e BG |
79 | static DEFINE_MUTEX(gpio_machine_hogs_mutex); |
80 | static LIST_HEAD(gpio_machine_hogs); | |
81 | ||
6d86750c | 82 | static void gpiochip_free_hogs(struct gpio_chip *chip); |
959bc7b2 | 83 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
84 | struct lock_class_key *lock_key, |
85 | struct lock_class_key *request_key); | |
6d86750c | 86 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); |
79b804cb MW |
87 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
88 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); | |
6d86750c | 89 | |
159f3cd9 | 90 | static bool gpiolib_initialized; |
6d86750c | 91 | |
d2876d08 DB |
92 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
93 | { | |
d2876d08 | 94 | d->label = label; |
d2876d08 DB |
95 | } |
96 | ||
372e722e | 97 | /** |
950d55f5 TR |
98 | * gpio_to_desc - Convert a GPIO number to its descriptor |
99 | * @gpio: global GPIO number | |
100 | * | |
101 | * Returns: | |
102 | * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO | |
103 | * with the given number exists in the system. | |
372e722e | 104 | */ |
79a9becd | 105 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 106 | { |
ff2b1359 | 107 | struct gpio_device *gdev; |
14e85c0e AC |
108 | unsigned long flags; |
109 | ||
110 | spin_lock_irqsave(&gpio_lock, flags); | |
111 | ||
ff2b1359 | 112 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
113 | if (gdev->base <= gpio && |
114 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 115 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 116 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
117 | } |
118 | } | |
119 | ||
120 | spin_unlock_irqrestore(&gpio_lock, flags); | |
121 | ||
0e9a5edf AC |
122 | if (!gpio_is_valid(gpio)) |
123 | WARN(1, "invalid GPIO %d\n", gpio); | |
124 | ||
14e85c0e | 125 | return NULL; |
372e722e | 126 | } |
79a9becd | 127 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 128 | |
d468bf9e | 129 | /** |
950d55f5 TR |
130 | * gpiochip_get_desc - get the GPIO descriptor corresponding to the given |
131 | * hardware number for this chip | |
132 | * @chip: GPIO chip | |
133 | * @hwnum: hardware number of the GPIO for this chip | |
134 | * | |
135 | * Returns: | |
136 | * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists | |
137 | * in the given chip for the specified hardware number. | |
d468bf9e | 138 | */ |
bb1e88cc AC |
139 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
140 | u16 hwnum) | |
d468bf9e | 141 | { |
fdeb8e15 LW |
142 | struct gpio_device *gdev = chip->gpiodev; |
143 | ||
144 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 145 | return ERR_PTR(-EINVAL); |
d468bf9e | 146 | |
fdeb8e15 | 147 | return &gdev->descs[hwnum]; |
d468bf9e | 148 | } |
372e722e AC |
149 | |
150 | /** | |
950d55f5 TR |
151 | * desc_to_gpio - convert a GPIO descriptor to the integer namespace |
152 | * @desc: GPIO descriptor | |
153 | * | |
372e722e | 154 | * This should disappear in the future but is needed since we still |
950d55f5 TR |
155 | * use GPIO numbers for error messages and sysfs nodes. |
156 | * | |
157 | * Returns: | |
158 | * The global GPIO number for the GPIO specified by its descriptor. | |
372e722e | 159 | */ |
79a9becd | 160 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 161 | { |
fdeb8e15 | 162 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 163 | } |
79a9becd | 164 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
165 | |
166 | ||
79a9becd AC |
167 | /** |
168 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
169 | * @desc: descriptor to return the chip of | |
170 | */ | |
171 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 172 | { |
dd3b9a44 | 173 | if (!desc || !desc->gdev) |
fdeb8e15 LW |
174 | return NULL; |
175 | return desc->gdev->chip; | |
372e722e | 176 | } |
79a9becd | 177 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 178 | |
8d0aab2f AV |
179 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
180 | static int gpiochip_find_base(int ngpio) | |
181 | { | |
ff2b1359 | 182 | struct gpio_device *gdev; |
83cabe33 | 183 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 184 | |
ff2b1359 | 185 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 186 | /* found a free space? */ |
fdeb8e15 | 187 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
188 | break; |
189 | else | |
190 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 191 | base = gdev->base - ngpio; |
8d0aab2f AV |
192 | } |
193 | ||
83cabe33 | 194 | if (gpio_is_valid(base)) { |
8d0aab2f | 195 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
196 | return base; |
197 | } else { | |
198 | pr_err("%s: cannot find free range\n", __func__); | |
199 | return -ENOSPC; | |
169b6a7a | 200 | } |
169b6a7a AV |
201 | } |
202 | ||
79a9becd AC |
203 | /** |
204 | * gpiod_get_direction - return the current direction of a GPIO | |
205 | * @desc: GPIO to get the direction of | |
206 | * | |
94fc7309 | 207 | * Returns 0 for output, 1 for input, or an error code in case of error. |
79a9becd AC |
208 | * |
209 | * This function may sleep if gpiod_cansleep() is true. | |
210 | */ | |
8e53b0f1 | 211 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
212 | { |
213 | struct gpio_chip *chip; | |
372e722e | 214 | unsigned offset; |
80b0a602 MN |
215 | int status = -EINVAL; |
216 | ||
372e722e AC |
217 | chip = gpiod_to_chip(desc); |
218 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
219 | |
220 | if (!chip->get_direction) | |
221 | return status; | |
222 | ||
372e722e | 223 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
224 | if (status > 0) { |
225 | /* GPIOF_DIR_IN, or other positive */ | |
226 | status = 1; | |
8e53b0f1 | 227 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
228 | } |
229 | if (status == 0) { | |
230 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 231 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
232 | } |
233 | return status; | |
234 | } | |
79a9becd | 235 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 236 | |
1a989d0f AC |
237 | /* |
238 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 239 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
240 | * |
241 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
242 | * space. | |
243 | */ | |
ff2b1359 | 244 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 245 | { |
a961f9b4 | 246 | struct gpio_device *prev, *next; |
1a989d0f | 247 | |
ff2b1359 | 248 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 249 | /* initial entry in list */ |
ff2b1359 | 250 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 251 | return 0; |
1a989d0f AC |
252 | } |
253 | ||
a961f9b4 BJZ |
254 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
255 | if (gdev->base + gdev->ngpio <= next->base) { | |
256 | /* add before first entry */ | |
257 | list_add(&gdev->list, &gpio_devices); | |
258 | return 0; | |
1a989d0f AC |
259 | } |
260 | ||
a961f9b4 BJZ |
261 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
262 | if (prev->base + prev->ngpio <= gdev->base) { | |
263 | /* add behind last entry */ | |
264 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 265 | return 0; |
1a989d0f AC |
266 | } |
267 | ||
a961f9b4 BJZ |
268 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
269 | /* at the end of the list */ | |
270 | if (&next->list == &gpio_devices) | |
271 | break; | |
1a989d0f | 272 | |
a961f9b4 BJZ |
273 | /* add between prev and next */ |
274 | if (prev->base + prev->ngpio <= gdev->base | |
275 | && gdev->base + gdev->ngpio <= next->base) { | |
276 | list_add(&gdev->list, &prev->list); | |
277 | return 0; | |
278 | } | |
279 | } | |
280 | ||
281 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
282 | return -EBUSY; | |
1a989d0f AC |
283 | } |
284 | ||
950d55f5 | 285 | /* |
f881bab0 LW |
286 | * Convert a GPIO name to its descriptor |
287 | */ | |
288 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
289 | { | |
ff2b1359 | 290 | struct gpio_device *gdev; |
f881bab0 LW |
291 | unsigned long flags; |
292 | ||
293 | spin_lock_irqsave(&gpio_lock, flags); | |
294 | ||
ff2b1359 | 295 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
296 | int i; |
297 | ||
fdeb8e15 LW |
298 | for (i = 0; i != gdev->ngpio; ++i) { |
299 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 300 | |
fdeb8e15 | 301 | if (!desc->name || !name) |
f881bab0 LW |
302 | continue; |
303 | ||
fdeb8e15 | 304 | if (!strcmp(desc->name, name)) { |
f881bab0 | 305 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 306 | return desc; |
f881bab0 LW |
307 | } |
308 | } | |
309 | } | |
310 | ||
311 | spin_unlock_irqrestore(&gpio_lock, flags); | |
312 | ||
313 | return NULL; | |
314 | } | |
315 | ||
5f3ca732 MP |
316 | /* |
317 | * Takes the names from gc->names and checks if they are all unique. If they | |
318 | * are, they are assigned to their gpio descriptors. | |
319 | * | |
ed37915c | 320 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
321 | */ |
322 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
323 | { | |
fdeb8e15 | 324 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
325 | int i; |
326 | ||
327 | if (!gc->names) | |
328 | return 0; | |
329 | ||
330 | /* First check all names if they are unique */ | |
331 | for (i = 0; i != gc->ngpio; ++i) { | |
332 | struct gpio_desc *gpio; | |
333 | ||
334 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 335 | if (gpio) |
fdeb8e15 | 336 | dev_warn(&gdev->dev, |
34ffd85d | 337 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 338 | gc->names[i]); |
5f3ca732 MP |
339 | } |
340 | ||
341 | /* Then add all names to the GPIO descriptors */ | |
342 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 343 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
344 | |
345 | return 0; | |
346 | } | |
347 | ||
e4371f6e SB |
348 | static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip) |
349 | { | |
350 | unsigned long *p; | |
351 | ||
ace56935 | 352 | p = kmalloc_array(BITS_TO_LONGS(chip->ngpio), sizeof(*p), GFP_KERNEL); |
e4371f6e SB |
353 | if (!p) |
354 | return NULL; | |
355 | ||
356 | /* Assume by default all GPIOs are valid */ | |
357 | bitmap_fill(p, chip->ngpio); | |
358 | ||
359 | return p; | |
360 | } | |
361 | ||
726cb3ba SB |
362 | static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip) |
363 | { | |
364 | #ifdef CONFIG_OF_GPIO | |
365 | int size; | |
366 | struct device_node *np = gpiochip->of_node; | |
367 | ||
368 | size = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
369 | if (size > 0 && size % 2 == 0) | |
370 | gpiochip->need_valid_mask = true; | |
371 | #endif | |
372 | ||
373 | if (!gpiochip->need_valid_mask) | |
374 | return 0; | |
375 | ||
376 | gpiochip->valid_mask = gpiochip_allocate_mask(gpiochip); | |
377 | if (!gpiochip->valid_mask) | |
378 | return -ENOMEM; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip) | |
384 | { | |
385 | kfree(gpiochip->valid_mask); | |
386 | gpiochip->valid_mask = NULL; | |
387 | } | |
388 | ||
389 | bool gpiochip_line_is_valid(const struct gpio_chip *gpiochip, | |
390 | unsigned int offset) | |
391 | { | |
392 | /* No mask means all valid */ | |
393 | if (likely(!gpiochip->valid_mask)) | |
394 | return true; | |
395 | return test_bit(offset, gpiochip->valid_mask); | |
396 | } | |
397 | EXPORT_SYMBOL_GPL(gpiochip_line_is_valid); | |
398 | ||
d7c51b47 LW |
399 | /* |
400 | * GPIO line handle management | |
401 | */ | |
402 | ||
403 | /** | |
404 | * struct linehandle_state - contains the state of a userspace handle | |
405 | * @gdev: the GPIO device the handle pertains to | |
406 | * @label: consumer label used to tag descriptors | |
407 | * @descs: the GPIO descriptors held by this handle | |
408 | * @numdescs: the number of descriptors held in the descs array | |
409 | */ | |
410 | struct linehandle_state { | |
411 | struct gpio_device *gdev; | |
412 | const char *label; | |
413 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
414 | u32 numdescs; | |
415 | }; | |
416 | ||
e3e847c7 LPC |
417 | #define GPIOHANDLE_REQUEST_VALID_FLAGS \ |
418 | (GPIOHANDLE_REQUEST_INPUT | \ | |
419 | GPIOHANDLE_REQUEST_OUTPUT | \ | |
420 | GPIOHANDLE_REQUEST_ACTIVE_LOW | \ | |
421 | GPIOHANDLE_REQUEST_OPEN_DRAIN | \ | |
422 | GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
423 | ||
d7c51b47 LW |
424 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, |
425 | unsigned long arg) | |
426 | { | |
427 | struct linehandle_state *lh = filep->private_data; | |
428 | void __user *ip = (void __user *)arg; | |
429 | struct gpiohandle_data ghd; | |
eec1d566 | 430 | int vals[GPIOHANDLES_MAX]; |
d7c51b47 LW |
431 | int i; |
432 | ||
433 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
2b955b34 | 434 | /* NOTE: It's ok to read values of output lines. */ |
eec1d566 LW |
435 | int ret = gpiod_get_array_value_complex(false, |
436 | true, | |
437 | lh->numdescs, | |
438 | lh->descs, | |
439 | vals); | |
440 | if (ret) | |
441 | return ret; | |
d7c51b47 | 442 | |
3eded5d8 | 443 | memset(&ghd, 0, sizeof(ghd)); |
eec1d566 LW |
444 | for (i = 0; i < lh->numdescs; i++) |
445 | ghd.values[i] = vals[i]; | |
d7c51b47 LW |
446 | |
447 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
448 | return -EFAULT; | |
449 | ||
450 | return 0; | |
451 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
e5332d54 BG |
452 | /* |
453 | * All line descriptors were created at once with the same | |
454 | * flags so just check if the first one is really output. | |
455 | */ | |
456 | if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags)) | |
457 | return -EPERM; | |
458 | ||
d7c51b47 LW |
459 | if (copy_from_user(&ghd, ip, sizeof(ghd))) |
460 | return -EFAULT; | |
461 | ||
462 | /* Clamp all values to [0,1] */ | |
463 | for (i = 0; i < lh->numdescs; i++) | |
464 | vals[i] = !!ghd.values[i]; | |
465 | ||
466 | /* Reuse the array setting function */ | |
3027743f | 467 | return gpiod_set_array_value_complex(false, |
d7c51b47 LW |
468 | true, |
469 | lh->numdescs, | |
470 | lh->descs, | |
471 | vals); | |
d7c51b47 LW |
472 | } |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | #ifdef CONFIG_COMPAT | |
477 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
478 | unsigned long arg) | |
479 | { | |
480 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
481 | } | |
482 | #endif | |
483 | ||
484 | static int linehandle_release(struct inode *inode, struct file *filep) | |
485 | { | |
486 | struct linehandle_state *lh = filep->private_data; | |
487 | struct gpio_device *gdev = lh->gdev; | |
488 | int i; | |
489 | ||
490 | for (i = 0; i < lh->numdescs; i++) | |
491 | gpiod_free(lh->descs[i]); | |
492 | kfree(lh->label); | |
493 | kfree(lh); | |
494 | put_device(&gdev->dev); | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static const struct file_operations linehandle_fileops = { | |
499 | .release = linehandle_release, | |
500 | .owner = THIS_MODULE, | |
501 | .llseek = noop_llseek, | |
502 | .unlocked_ioctl = linehandle_ioctl, | |
503 | #ifdef CONFIG_COMPAT | |
504 | .compat_ioctl = linehandle_ioctl_compat, | |
505 | #endif | |
506 | }; | |
507 | ||
508 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
509 | { | |
510 | struct gpiohandle_request handlereq; | |
511 | struct linehandle_state *lh; | |
953b956a | 512 | struct file *file; |
ab3dbcf7 | 513 | int fd, i, count = 0, ret; |
418ee8e9 | 514 | u32 lflags; |
d7c51b47 LW |
515 | |
516 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
517 | return -EFAULT; | |
518 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
519 | return -EINVAL; | |
520 | ||
418ee8e9 BG |
521 | lflags = handlereq.flags; |
522 | ||
523 | /* Return an error if an unknown flag is set */ | |
524 | if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) | |
525 | return -EINVAL; | |
526 | ||
588fc3bc BG |
527 | /* |
528 | * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If | |
529 | * the hardware actually supports enabling both at the same time the | |
530 | * electrical result would be disastrous. | |
531 | */ | |
532 | if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) && | |
533 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)) | |
534 | return -EINVAL; | |
535 | ||
609aaf6a BG |
536 | /* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */ |
537 | if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) && | |
538 | ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || | |
539 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))) | |
540 | return -EINVAL; | |
541 | ||
d7c51b47 LW |
542 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); |
543 | if (!lh) | |
544 | return -ENOMEM; | |
545 | lh->gdev = gdev; | |
546 | get_device(&gdev->dev); | |
547 | ||
548 | /* Make sure this is terminated */ | |
549 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
550 | if (strlen(handlereq.consumer_label)) { | |
551 | lh->label = kstrdup(handlereq.consumer_label, | |
552 | GFP_KERNEL); | |
553 | if (!lh->label) { | |
554 | ret = -ENOMEM; | |
555 | goto out_free_lh; | |
556 | } | |
557 | } | |
558 | ||
559 | /* Request each GPIO */ | |
560 | for (i = 0; i < handlereq.lines; i++) { | |
561 | u32 offset = handlereq.lineoffsets[i]; | |
d7c51b47 LW |
562 | struct gpio_desc *desc; |
563 | ||
e405f9fc LPC |
564 | if (offset >= gdev->ngpio) { |
565 | ret = -EINVAL; | |
566 | goto out_free_descs; | |
567 | } | |
568 | ||
d7c51b47 LW |
569 | desc = &gdev->descs[offset]; |
570 | ret = gpiod_request(desc, lh->label); | |
571 | if (ret) | |
572 | goto out_free_descs; | |
573 | lh->descs[i] = desc; | |
ab3dbcf7 | 574 | count = i; |
d7c51b47 LW |
575 | |
576 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
577 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
578 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
579 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
580 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
581 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
582 | ||
e10f72bf AJ |
583 | ret = gpiod_set_transitory(desc, false); |
584 | if (ret < 0) | |
585 | goto out_free_descs; | |
586 | ||
d7c51b47 LW |
587 | /* |
588 | * Lines have to be requested explicitly for input | |
589 | * or output, else the line will be treated "as is". | |
590 | */ | |
591 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
592 | int val = !!handlereq.default_values[i]; | |
593 | ||
594 | ret = gpiod_direction_output(desc, val); | |
595 | if (ret) | |
596 | goto out_free_descs; | |
597 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
598 | ret = gpiod_direction_input(desc); | |
599 | if (ret) | |
600 | goto out_free_descs; | |
601 | } | |
602 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
603 | offset); | |
604 | } | |
e2f608be LW |
605 | /* Let i point at the last handle */ |
606 | i--; | |
d7c51b47 LW |
607 | lh->numdescs = handlereq.lines; |
608 | ||
953b956a | 609 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
d7c51b47 LW |
610 | if (fd < 0) { |
611 | ret = fd; | |
612 | goto out_free_descs; | |
613 | } | |
614 | ||
953b956a LPC |
615 | file = anon_inode_getfile("gpio-linehandle", |
616 | &linehandle_fileops, | |
617 | lh, | |
618 | O_RDONLY | O_CLOEXEC); | |
619 | if (IS_ERR(file)) { | |
620 | ret = PTR_ERR(file); | |
621 | goto out_put_unused_fd; | |
622 | } | |
623 | ||
d7c51b47 | 624 | handlereq.fd = fd; |
d932cd49 | 625 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
953b956a LPC |
626 | /* |
627 | * fput() will trigger the release() callback, so do not go onto | |
628 | * the regular error cleanup path here. | |
629 | */ | |
630 | fput(file); | |
631 | put_unused_fd(fd); | |
632 | return -EFAULT; | |
d932cd49 | 633 | } |
d7c51b47 | 634 | |
953b956a LPC |
635 | fd_install(fd, file); |
636 | ||
d7c51b47 LW |
637 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", |
638 | lh->numdescs); | |
639 | ||
640 | return 0; | |
641 | ||
953b956a LPC |
642 | out_put_unused_fd: |
643 | put_unused_fd(fd); | |
d7c51b47 | 644 | out_free_descs: |
ab3dbcf7 | 645 | for (i = 0; i < count; i++) |
d7c51b47 LW |
646 | gpiod_free(lh->descs[i]); |
647 | kfree(lh->label); | |
648 | out_free_lh: | |
649 | kfree(lh); | |
650 | put_device(&gdev->dev); | |
651 | return ret; | |
652 | } | |
653 | ||
61f922db LW |
654 | /* |
655 | * GPIO line event management | |
656 | */ | |
657 | ||
658 | /** | |
659 | * struct lineevent_state - contains the state of a userspace event | |
660 | * @gdev: the GPIO device the event pertains to | |
661 | * @label: consumer label used to tag descriptors | |
662 | * @desc: the GPIO descriptor held by this event | |
663 | * @eflags: the event flags this line was requested with | |
664 | * @irq: the interrupt that trigger in response to events on this GPIO | |
665 | * @wait: wait queue that handles blocking reads of events | |
666 | * @events: KFIFO for the GPIO events | |
667 | * @read_lock: mutex lock to protect reads from colliding with adding | |
668 | * new events to the FIFO | |
d58f2bf2 LW |
669 | * @timestamp: cache for the timestamp storing it between hardirq |
670 | * and IRQ thread, used to bring the timestamp close to the actual | |
671 | * event | |
61f922db LW |
672 | */ |
673 | struct lineevent_state { | |
674 | struct gpio_device *gdev; | |
675 | const char *label; | |
676 | struct gpio_desc *desc; | |
677 | u32 eflags; | |
678 | int irq; | |
679 | wait_queue_head_t wait; | |
680 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
681 | struct mutex read_lock; | |
d58f2bf2 | 682 | u64 timestamp; |
61f922db LW |
683 | }; |
684 | ||
ac7dbb99 LPC |
685 | #define GPIOEVENT_REQUEST_VALID_FLAGS \ |
686 | (GPIOEVENT_REQUEST_RISING_EDGE | \ | |
687 | GPIOEVENT_REQUEST_FALLING_EDGE) | |
688 | ||
afc9a42b | 689 | static __poll_t lineevent_poll(struct file *filep, |
61f922db LW |
690 | struct poll_table_struct *wait) |
691 | { | |
692 | struct lineevent_state *le = filep->private_data; | |
afc9a42b | 693 | __poll_t events = 0; |
61f922db LW |
694 | |
695 | poll_wait(filep, &le->wait, wait); | |
696 | ||
697 | if (!kfifo_is_empty(&le->events)) | |
a9a08845 | 698 | events = EPOLLIN | EPOLLRDNORM; |
61f922db LW |
699 | |
700 | return events; | |
701 | } | |
702 | ||
703 | ||
704 | static ssize_t lineevent_read(struct file *filep, | |
705 | char __user *buf, | |
706 | size_t count, | |
707 | loff_t *f_ps) | |
708 | { | |
709 | struct lineevent_state *le = filep->private_data; | |
710 | unsigned int copied; | |
711 | int ret; | |
712 | ||
713 | if (count < sizeof(struct gpioevent_data)) | |
714 | return -EINVAL; | |
715 | ||
716 | do { | |
717 | if (kfifo_is_empty(&le->events)) { | |
718 | if (filep->f_flags & O_NONBLOCK) | |
719 | return -EAGAIN; | |
720 | ||
721 | ret = wait_event_interruptible(le->wait, | |
722 | !kfifo_is_empty(&le->events)); | |
723 | if (ret) | |
724 | return ret; | |
725 | } | |
726 | ||
727 | if (mutex_lock_interruptible(&le->read_lock)) | |
728 | return -ERESTARTSYS; | |
729 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
730 | mutex_unlock(&le->read_lock); | |
731 | ||
732 | if (ret) | |
733 | return ret; | |
734 | ||
735 | /* | |
736 | * If we couldn't read anything from the fifo (a different | |
737 | * thread might have been faster) we either return -EAGAIN if | |
738 | * the file descriptor is non-blocking, otherwise we go back to | |
739 | * sleep and wait for more data to arrive. | |
740 | */ | |
741 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
742 | return -EAGAIN; | |
743 | ||
744 | } while (copied == 0); | |
745 | ||
746 | return copied; | |
747 | } | |
748 | ||
749 | static int lineevent_release(struct inode *inode, struct file *filep) | |
750 | { | |
751 | struct lineevent_state *le = filep->private_data; | |
752 | struct gpio_device *gdev = le->gdev; | |
753 | ||
754 | free_irq(le->irq, le); | |
755 | gpiod_free(le->desc); | |
756 | kfree(le->label); | |
757 | kfree(le); | |
758 | put_device(&gdev->dev); | |
759 | return 0; | |
760 | } | |
761 | ||
762 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
763 | unsigned long arg) | |
764 | { | |
765 | struct lineevent_state *le = filep->private_data; | |
766 | void __user *ip = (void __user *)arg; | |
767 | struct gpiohandle_data ghd; | |
768 | ||
769 | /* | |
770 | * We can get the value for an event line but not set it, | |
771 | * because it is input by definition. | |
772 | */ | |
773 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
774 | int val; | |
775 | ||
d82aa4a8 LPC |
776 | memset(&ghd, 0, sizeof(ghd)); |
777 | ||
61f922db LW |
778 | val = gpiod_get_value_cansleep(le->desc); |
779 | if (val < 0) | |
780 | return val; | |
781 | ghd.values[0] = val; | |
782 | ||
783 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
784 | return -EFAULT; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | return -EINVAL; | |
789 | } | |
790 | ||
791 | #ifdef CONFIG_COMPAT | |
792 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
793 | unsigned long arg) | |
794 | { | |
795 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
796 | } | |
797 | #endif | |
798 | ||
799 | static const struct file_operations lineevent_fileops = { | |
800 | .release = lineevent_release, | |
801 | .read = lineevent_read, | |
802 | .poll = lineevent_poll, | |
803 | .owner = THIS_MODULE, | |
804 | .llseek = noop_llseek, | |
805 | .unlocked_ioctl = lineevent_ioctl, | |
806 | #ifdef CONFIG_COMPAT | |
807 | .compat_ioctl = lineevent_ioctl_compat, | |
808 | #endif | |
809 | }; | |
810 | ||
33265b17 | 811 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
812 | { |
813 | struct lineevent_state *le = p; | |
814 | struct gpioevent_data ge; | |
df1e76f2 | 815 | int ret, level; |
61f922db | 816 | |
24bd3efc LW |
817 | /* Do not leak kernel stack to userspace */ |
818 | memset(&ge, 0, sizeof(ge)); | |
819 | ||
d58f2bf2 | 820 | ge.timestamp = le->timestamp; |
df1e76f2 | 821 | level = gpiod_get_value_cansleep(le->desc); |
61f922db | 822 | |
ad537b82 BG |
823 | if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE |
824 | && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
61f922db LW |
825 | if (level) |
826 | /* Emit low-to-high event */ | |
827 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
828 | else | |
829 | /* Emit high-to-low event */ | |
830 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
df1e76f2 | 831 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE && level) { |
61f922db LW |
832 | /* Emit low-to-high event */ |
833 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
df1e76f2 | 834 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE && !level) { |
61f922db LW |
835 | /* Emit high-to-low event */ |
836 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
837 | } else { |
838 | return IRQ_NONE; | |
61f922db LW |
839 | } |
840 | ||
841 | ret = kfifo_put(&le->events, ge); | |
842 | if (ret != 0) | |
a9a08845 | 843 | wake_up_poll(&le->wait, EPOLLIN); |
61f922db LW |
844 | |
845 | return IRQ_HANDLED; | |
846 | } | |
847 | ||
d58f2bf2 LW |
848 | static irqreturn_t lineevent_irq_handler(int irq, void *p) |
849 | { | |
850 | struct lineevent_state *le = p; | |
851 | ||
852 | /* | |
853 | * Just store the timestamp in hardirq context so we get it as | |
854 | * close in time as possible to the actual event. | |
855 | */ | |
856 | le->timestamp = ktime_get_real_ns(); | |
857 | ||
858 | return IRQ_WAKE_THREAD; | |
859 | } | |
860 | ||
61f922db LW |
861 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) |
862 | { | |
863 | struct gpioevent_request eventreq; | |
864 | struct lineevent_state *le; | |
865 | struct gpio_desc *desc; | |
953b956a | 866 | struct file *file; |
61f922db LW |
867 | u32 offset; |
868 | u32 lflags; | |
869 | u32 eflags; | |
870 | int fd; | |
871 | int ret; | |
872 | int irqflags = 0; | |
873 | ||
874 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
875 | return -EFAULT; | |
876 | ||
877 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
878 | if (!le) | |
879 | return -ENOMEM; | |
880 | le->gdev = gdev; | |
881 | get_device(&gdev->dev); | |
882 | ||
883 | /* Make sure this is terminated */ | |
884 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
885 | if (strlen(eventreq.consumer_label)) { | |
886 | le->label = kstrdup(eventreq.consumer_label, | |
887 | GFP_KERNEL); | |
888 | if (!le->label) { | |
889 | ret = -ENOMEM; | |
890 | goto out_free_le; | |
891 | } | |
892 | } | |
893 | ||
894 | offset = eventreq.lineoffset; | |
895 | lflags = eventreq.handleflags; | |
896 | eflags = eventreq.eventflags; | |
897 | ||
b8b0e3d3 LPC |
898 | if (offset >= gdev->ngpio) { |
899 | ret = -EINVAL; | |
900 | goto out_free_label; | |
901 | } | |
902 | ||
ac7dbb99 LPC |
903 | /* Return an error if a unknown flag is set */ |
904 | if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || | |
905 | (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { | |
906 | ret = -EINVAL; | |
907 | goto out_free_label; | |
908 | } | |
909 | ||
61f922db LW |
910 | /* This is just wrong: we don't look for events on output lines */ |
911 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
912 | ret = -EINVAL; | |
913 | goto out_free_label; | |
914 | } | |
915 | ||
916 | desc = &gdev->descs[offset]; | |
917 | ret = gpiod_request(desc, le->label); | |
918 | if (ret) | |
f001cc35 | 919 | goto out_free_label; |
61f922db LW |
920 | le->desc = desc; |
921 | le->eflags = eflags; | |
922 | ||
923 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
924 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
925 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
926 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
927 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
928 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
929 | ||
930 | ret = gpiod_direction_input(desc); | |
931 | if (ret) | |
932 | goto out_free_desc; | |
933 | ||
934 | le->irq = gpiod_to_irq(desc); | |
935 | if (le->irq <= 0) { | |
936 | ret = -ENODEV; | |
937 | goto out_free_desc; | |
938 | } | |
939 | ||
940 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
941 | irqflags |= IRQF_TRIGGER_RISING; | |
942 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
943 | irqflags |= IRQF_TRIGGER_FALLING; | |
944 | irqflags |= IRQF_ONESHOT; | |
945 | irqflags |= IRQF_SHARED; | |
946 | ||
947 | INIT_KFIFO(le->events); | |
948 | init_waitqueue_head(&le->wait); | |
949 | mutex_init(&le->read_lock); | |
950 | ||
951 | /* Request a thread to read the events */ | |
952 | ret = request_threaded_irq(le->irq, | |
d58f2bf2 | 953 | lineevent_irq_handler, |
61f922db LW |
954 | lineevent_irq_thread, |
955 | irqflags, | |
956 | le->label, | |
957 | le); | |
958 | if (ret) | |
959 | goto out_free_desc; | |
960 | ||
953b956a | 961 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
61f922db LW |
962 | if (fd < 0) { |
963 | ret = fd; | |
964 | goto out_free_irq; | |
965 | } | |
966 | ||
953b956a LPC |
967 | file = anon_inode_getfile("gpio-event", |
968 | &lineevent_fileops, | |
969 | le, | |
970 | O_RDONLY | O_CLOEXEC); | |
971 | if (IS_ERR(file)) { | |
972 | ret = PTR_ERR(file); | |
973 | goto out_put_unused_fd; | |
974 | } | |
975 | ||
61f922db | 976 | eventreq.fd = fd; |
d932cd49 | 977 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
953b956a LPC |
978 | /* |
979 | * fput() will trigger the release() callback, so do not go onto | |
980 | * the regular error cleanup path here. | |
981 | */ | |
982 | fput(file); | |
983 | put_unused_fd(fd); | |
984 | return -EFAULT; | |
d932cd49 | 985 | } |
61f922db | 986 | |
953b956a LPC |
987 | fd_install(fd, file); |
988 | ||
61f922db LW |
989 | return 0; |
990 | ||
953b956a LPC |
991 | out_put_unused_fd: |
992 | put_unused_fd(fd); | |
61f922db LW |
993 | out_free_irq: |
994 | free_irq(le->irq, le); | |
995 | out_free_desc: | |
996 | gpiod_free(le->desc); | |
997 | out_free_label: | |
998 | kfree(le->label); | |
999 | out_free_le: | |
1000 | kfree(le); | |
1001 | put_device(&gdev->dev); | |
1002 | return ret; | |
1003 | } | |
1004 | ||
950d55f5 | 1005 | /* |
3c702e99 LW |
1006 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
1007 | */ | |
1008 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1009 | { | |
1010 | struct gpio_device *gdev = filp->private_data; | |
1011 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 1012 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
1013 | |
1014 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
1015 | if (!chip) | |
1016 | return -ENODEV; | |
1017 | ||
521a2ad6 | 1018 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 1019 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
1020 | struct gpiochip_info chipinfo; |
1021 | ||
0f4bbb23 LPC |
1022 | memset(&chipinfo, 0, sizeof(chipinfo)); |
1023 | ||
3c702e99 LW |
1024 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
1025 | sizeof(chipinfo.name)); | |
1026 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
1027 | strncpy(chipinfo.label, gdev->label, |
1028 | sizeof(chipinfo.label)); | |
1029 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 1030 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
1031 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
1032 | return -EFAULT; | |
1033 | return 0; | |
521a2ad6 LW |
1034 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
1035 | struct gpioline_info lineinfo; | |
1036 | struct gpio_desc *desc; | |
1037 | ||
1038 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
1039 | return -EFAULT; | |
1f1cc456 | 1040 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
1041 | return -EINVAL; |
1042 | ||
1043 | desc = &gdev->descs[lineinfo.line_offset]; | |
1044 | if (desc->name) { | |
1045 | strncpy(lineinfo.name, desc->name, | |
1046 | sizeof(lineinfo.name)); | |
1047 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
1048 | } else { | |
1049 | lineinfo.name[0] = '\0'; | |
1050 | } | |
1051 | if (desc->label) { | |
214338e3 LW |
1052 | strncpy(lineinfo.consumer, desc->label, |
1053 | sizeof(lineinfo.consumer)); | |
1054 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 1055 | } else { |
214338e3 | 1056 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
1057 | } |
1058 | ||
1059 | /* | |
1060 | * Userspace only need to know that the kernel is using | |
1061 | * this GPIO so it can't use it. | |
1062 | */ | |
1063 | lineinfo.flags = 0; | |
9d8cc89c LW |
1064 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
1065 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
1066 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
1067 | test_bit(FLAG_EXPORT, &desc->flags) || | |
1068 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 1069 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 1070 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 1071 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 1072 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 1073 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 1074 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 1075 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 1076 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
1077 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
1078 | ||
1079 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
1080 | return -EFAULT; | |
1081 | return 0; | |
d7c51b47 LW |
1082 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
1083 | return linehandle_create(gdev, ip); | |
61f922db LW |
1084 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
1085 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
1086 | } |
1087 | return -EINVAL; | |
1088 | } | |
1089 | ||
8b92e17e LW |
1090 | #ifdef CONFIG_COMPAT |
1091 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
1092 | unsigned long arg) | |
1093 | { | |
1094 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1095 | } | |
1096 | #endif | |
1097 | ||
3c702e99 LW |
1098 | /** |
1099 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
1100 | * @inode: inode for this chardev | |
1101 | * @filp: file struct for storing private data | |
1102 | * Returns 0 on success | |
1103 | */ | |
1104 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
1105 | { | |
1106 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1107 | struct gpio_device, chrdev); | |
1108 | ||
1109 | /* Fail on open if the backing gpiochip is gone */ | |
fb505747 | 1110 | if (!gdev->chip) |
3c702e99 LW |
1111 | return -ENODEV; |
1112 | get_device(&gdev->dev); | |
1113 | filp->private_data = gdev; | |
f4e81c52 LPC |
1114 | |
1115 | return nonseekable_open(inode, filp); | |
3c702e99 LW |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * gpio_chrdev_release() - close chardev after ioctl operations | |
1120 | * @inode: inode for this chardev | |
1121 | * @filp: file struct for storing private data | |
1122 | * Returns 0 on success | |
1123 | */ | |
1124 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
1125 | { | |
1126 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1127 | struct gpio_device, chrdev); | |
1128 | ||
3c702e99 LW |
1129 | put_device(&gdev->dev); |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | ||
1134 | static const struct file_operations gpio_fileops = { | |
1135 | .release = gpio_chrdev_release, | |
1136 | .open = gpio_chrdev_open, | |
1137 | .owner = THIS_MODULE, | |
f4e81c52 | 1138 | .llseek = no_llseek, |
3c702e99 | 1139 | .unlocked_ioctl = gpio_ioctl, |
8b92e17e LW |
1140 | #ifdef CONFIG_COMPAT |
1141 | .compat_ioctl = gpio_ioctl_compat, | |
1142 | #endif | |
3c702e99 LW |
1143 | }; |
1144 | ||
ff2b1359 LW |
1145 | static void gpiodevice_release(struct device *dev) |
1146 | { | |
1147 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
1148 | ||
1149 | list_del(&gdev->list); | |
1150 | ida_simple_remove(&gpio_ida, gdev->id); | |
fcf273e5 | 1151 | kfree_const(gdev->label); |
476e2fc5 | 1152 | kfree(gdev->descs); |
9efd9e69 | 1153 | kfree(gdev); |
ff2b1359 LW |
1154 | } |
1155 | ||
159f3cd9 GR |
1156 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
1157 | { | |
1158 | int status; | |
1159 | ||
1160 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
1161 | gdev->chrdev.owner = THIS_MODULE; | |
159f3cd9 | 1162 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
111379dc LG |
1163 | |
1164 | status = cdev_device_add(&gdev->chrdev, &gdev->dev); | |
159f3cd9 | 1165 | if (status) |
111379dc LG |
1166 | return status; |
1167 | ||
1168 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
1169 | MAJOR(gpio_devt), gdev->id); | |
159f3cd9 GR |
1170 | |
1171 | status = gpiochip_sysfs_register(gdev); | |
1172 | if (status) | |
1173 | goto err_remove_device; | |
1174 | ||
1175 | /* From this point, the .release() function cleans up gpio_device */ | |
1176 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
1177 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
1178 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1179 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1180 | ||
1181 | return 0; | |
1182 | ||
1183 | err_remove_device: | |
111379dc | 1184 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
159f3cd9 GR |
1185 | return status; |
1186 | } | |
1187 | ||
a411e81e BG |
1188 | static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog) |
1189 | { | |
1190 | struct gpio_desc *desc; | |
1191 | int rv; | |
1192 | ||
1193 | desc = gpiochip_get_desc(chip, hog->chip_hwnum); | |
1194 | if (IS_ERR(desc)) { | |
1195 | pr_err("%s: unable to get GPIO desc: %ld\n", | |
1196 | __func__, PTR_ERR(desc)); | |
1197 | return; | |
1198 | } | |
1199 | ||
ba3efdff | 1200 | if (test_bit(FLAG_IS_HOGGED, &desc->flags)) |
a411e81e BG |
1201 | return; |
1202 | ||
1203 | rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags); | |
1204 | if (rv) | |
1205 | pr_err("%s: unable to hog GPIO line (%s:%u): %d\n", | |
1206 | __func__, chip->label, hog->chip_hwnum, rv); | |
1207 | } | |
1208 | ||
1209 | static void machine_gpiochip_add(struct gpio_chip *chip) | |
1210 | { | |
1211 | struct gpiod_hog *hog; | |
1212 | ||
1213 | mutex_lock(&gpio_machine_hogs_mutex); | |
1214 | ||
1215 | list_for_each_entry(hog, &gpio_machine_hogs, list) { | |
1216 | if (!strcmp(chip->label, hog->chip_label)) | |
1217 | gpiochip_machine_hog(chip, hog); | |
1218 | } | |
1219 | ||
1220 | mutex_unlock(&gpio_machine_hogs_mutex); | |
1221 | } | |
1222 | ||
159f3cd9 GR |
1223 | static void gpiochip_setup_devs(void) |
1224 | { | |
1225 | struct gpio_device *gdev; | |
1226 | int err; | |
1227 | ||
1228 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1229 | err = gpiochip_setup_dev(gdev); | |
1230 | if (err) | |
1231 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1232 | dev_name(&gdev->dev), err); | |
1233 | } | |
1234 | } | |
1235 | ||
959bc7b2 | 1236 | int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, |
39c3fd58 AL |
1237 | struct lock_class_key *lock_key, |
1238 | struct lock_class_key *request_key) | |
d2876d08 DB |
1239 | { |
1240 | unsigned long flags; | |
1241 | int status = 0; | |
ff2b1359 | 1242 | unsigned i; |
8d0aab2f | 1243 | int base = chip->base; |
ff2b1359 | 1244 | struct gpio_device *gdev; |
d2876d08 | 1245 | |
ff2b1359 LW |
1246 | /* |
1247 | * First: allocate and populate the internal stat container, and | |
1248 | * set up the struct device. | |
1249 | */ | |
969f07b4 | 1250 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1251 | if (!gdev) |
14e85c0e | 1252 | return -ENOMEM; |
3c702e99 | 1253 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1254 | gdev->chip = chip; |
1255 | chip->gpiodev = gdev; | |
1256 | if (chip->parent) { | |
1257 | gdev->dev.parent = chip->parent; | |
1258 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1259 | } |
1260 | ||
ff2b1359 LW |
1261 | #ifdef CONFIG_OF_GPIO |
1262 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1263 | if (chip->of_node) |
1264 | gdev->dev.of_node = chip->of_node; | |
6ff04974 BD |
1265 | else |
1266 | chip->of_node = gdev->dev.of_node; | |
ff2b1359 | 1267 | #endif |
acc6e331 | 1268 | |
ff2b1359 LW |
1269 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1270 | if (gdev->id < 0) { | |
1271 | status = gdev->id; | |
1272 | goto err_free_gdev; | |
1273 | } | |
1274 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1275 | device_initialize(&gdev->dev); | |
1276 | dev_set_drvdata(&gdev->dev, gdev); | |
1277 | if (chip->parent && chip->parent->driver) | |
1278 | gdev->owner = chip->parent->driver->owner; | |
1279 | else if (chip->owner) | |
1280 | /* TODO: remove chip->owner */ | |
1281 | gdev->owner = chip->owner; | |
1282 | else | |
1283 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1284 | |
476e2fc5 | 1285 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1286 | if (!gdev->descs) { |
ff2b1359 LW |
1287 | status = -ENOMEM; |
1288 | goto err_free_gdev; | |
1289 | } | |
1290 | ||
5ed41cc4 BJZ |
1291 | if (chip->ngpio == 0) { |
1292 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1293 | status = -EINVAL; |
159f3cd9 | 1294 | goto err_free_descs; |
5ed41cc4 | 1295 | } |
df4878e9 | 1296 | |
3027743f LA |
1297 | if (chip->ngpio > FASTPATH_NGPIO) |
1298 | chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n", | |
1299 | chip->ngpio, FASTPATH_NGPIO); | |
1300 | ||
fcf273e5 | 1301 | gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL); |
df4878e9 LW |
1302 | if (!gdev->label) { |
1303 | status = -ENOMEM; | |
476e2fc5 | 1304 | goto err_free_descs; |
df4878e9 LW |
1305 | } |
1306 | ||
fdeb8e15 | 1307 | gdev->ngpio = chip->ngpio; |
43c54eca | 1308 | gdev->data = data; |
5ed41cc4 | 1309 | |
d2876d08 DB |
1310 | spin_lock_irqsave(&gpio_lock, flags); |
1311 | ||
fdeb8e15 LW |
1312 | /* |
1313 | * TODO: this allocates a Linux GPIO number base in the global | |
1314 | * GPIO numberspace for this chip. In the long run we want to | |
1315 | * get *rid* of this numberspace and use only descriptors, but | |
1316 | * it may be a pipe dream. It will not happen before we get rid | |
1317 | * of the sysfs interface anyways. | |
1318 | */ | |
8d0aab2f AV |
1319 | if (base < 0) { |
1320 | base = gpiochip_find_base(chip->ngpio); | |
1321 | if (base < 0) { | |
1322 | status = base; | |
225fce83 | 1323 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1324 | goto err_free_label; |
8d0aab2f | 1325 | } |
fdeb8e15 LW |
1326 | /* |
1327 | * TODO: it should not be necessary to reflect the assigned | |
1328 | * base outside of the GPIO subsystem. Go over drivers and | |
1329 | * see if anyone makes use of this, else drop this and assign | |
1330 | * a poison instead. | |
1331 | */ | |
8d0aab2f AV |
1332 | chip->base = base; |
1333 | } | |
fdeb8e15 | 1334 | gdev->base = base; |
8d0aab2f | 1335 | |
ff2b1359 | 1336 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1337 | if (status) { |
1338 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1339 | goto err_free_label; |
05aa5203 | 1340 | } |
1a989d0f | 1341 | |
545ebd9a LW |
1342 | spin_unlock_irqrestore(&gpio_lock, flags); |
1343 | ||
ff2b1359 | 1344 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1345 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1346 | |
fdeb8e15 | 1347 | desc->gdev = gdev; |
72d32000 | 1348 | |
1ca2a92b TT |
1349 | /* REVISIT: most hardware initializes GPIOs as inputs (often |
1350 | * with pullups enabled) so power usage is minimized. Linux | |
1351 | * code should set the gpio direction first thing; but until | |
1352 | * it does, and in case chip->get_direction is not set, we may | |
1353 | * expose the wrong direction in sysfs. | |
1354 | */ | |
1355 | desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; | |
d2876d08 | 1356 | } |
14e85c0e | 1357 | |
f23f1516 | 1358 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1359 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1360 | #endif |
1361 | ||
5f3ca732 MP |
1362 | status = gpiochip_set_desc_names(chip); |
1363 | if (status) | |
1364 | goto err_remove_from_list; | |
1365 | ||
79b804cb MW |
1366 | status = gpiochip_irqchip_init_valid_mask(chip); |
1367 | if (status) | |
1368 | goto err_remove_from_list; | |
1369 | ||
726cb3ba SB |
1370 | status = gpiochip_init_valid_mask(chip); |
1371 | if (status) | |
1372 | goto err_remove_irqchip_mask; | |
1373 | ||
39c3fd58 | 1374 | status = gpiochip_add_irqchip(chip, lock_key, request_key); |
e0d89728 TR |
1375 | if (status) |
1376 | goto err_remove_chip; | |
1377 | ||
28355f81 TV |
1378 | status = of_gpiochip_add(chip); |
1379 | if (status) | |
1380 | goto err_remove_chip; | |
1381 | ||
664e3e5a | 1382 | acpi_gpiochip_add(chip); |
391c970c | 1383 | |
a411e81e BG |
1384 | machine_gpiochip_add(chip); |
1385 | ||
3c702e99 LW |
1386 | /* |
1387 | * By first adding the chardev, and then adding the device, | |
1388 | * we get a device node entry in sysfs under | |
1389 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1390 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1391 | * We can do this only if gpiolib has been initialized. |
1392 | * Otherwise, defer until later. | |
3c702e99 | 1393 | */ |
159f3cd9 GR |
1394 | if (gpiolib_initialized) { |
1395 | status = gpiochip_setup_dev(gdev); | |
1396 | if (status) | |
1397 | goto err_remove_chip; | |
1398 | } | |
cedb1881 | 1399 | return 0; |
3bae4811 | 1400 | |
225fce83 JH |
1401 | err_remove_chip: |
1402 | acpi_gpiochip_remove(chip); | |
6d86750c | 1403 | gpiochip_free_hogs(chip); |
225fce83 | 1404 | of_gpiochip_remove(chip); |
726cb3ba SB |
1405 | gpiochip_free_valid_mask(chip); |
1406 | err_remove_irqchip_mask: | |
79b804cb | 1407 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1408 | err_remove_from_list: |
225fce83 | 1409 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1410 | list_del(&gdev->list); |
3bae4811 | 1411 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1412 | err_free_label: |
fcf273e5 | 1413 | kfree_const(gdev->label); |
476e2fc5 GR |
1414 | err_free_descs: |
1415 | kfree(gdev->descs); | |
ff2b1359 LW |
1416 | err_free_gdev: |
1417 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1418 | /* failures here can mean systems won't boot... */ |
1777fc97 | 1419 | pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, |
fdeb8e15 | 1420 | gdev->base, gdev->base + gdev->ngpio - 1, |
1777fc97 | 1421 | chip->label ? : "generic", status); |
fdeb8e15 | 1422 | kfree(gdev); |
d2876d08 DB |
1423 | return status; |
1424 | } | |
959bc7b2 | 1425 | EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); |
d2876d08 | 1426 | |
43c54eca LW |
1427 | /** |
1428 | * gpiochip_get_data() - get per-subdriver data for the chip | |
950d55f5 TR |
1429 | * @chip: GPIO chip |
1430 | * | |
1431 | * Returns: | |
1432 | * The per-subdriver data for the chip. | |
43c54eca LW |
1433 | */ |
1434 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1435 | { | |
1436 | return chip->gpiodev->data; | |
1437 | } | |
1438 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1439 | ||
d2876d08 DB |
1440 | /** |
1441 | * gpiochip_remove() - unregister a gpio_chip | |
1442 | * @chip: the chip to unregister | |
1443 | * | |
1444 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1445 | */ | |
e1db1706 | 1446 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1447 | { |
ff2b1359 | 1448 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1449 | struct gpio_desc *desc; |
d2876d08 | 1450 | unsigned long flags; |
1c3cdb18 | 1451 | unsigned i; |
fab28b89 | 1452 | bool requested = false; |
d2876d08 | 1453 | |
ff2b1359 | 1454 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1455 | gpiochip_sysfs_unregister(gdev); |
5018ada6 | 1456 | gpiochip_free_hogs(chip); |
bd203bd5 BJZ |
1457 | /* Numb the device, cancelling all outstanding operations */ |
1458 | gdev->chip = NULL; | |
00acc3dc | 1459 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1460 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1461 | gpiochip_remove_pin_ranges(chip); |
391c970c | 1462 | of_gpiochip_remove(chip); |
726cb3ba | 1463 | gpiochip_free_valid_mask(chip); |
43c54eca LW |
1464 | /* |
1465 | * We accept no more calls into the driver from this point, so | |
1466 | * NULL the driver data pointer | |
1467 | */ | |
1468 | gdev->data = NULL; | |
391c970c | 1469 | |
6798acaa | 1470 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1471 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1472 | desc = &gdev->descs[i]; |
fab28b89 JH |
1473 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1474 | requested = true; | |
d2876d08 | 1475 | } |
d2876d08 | 1476 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1477 | |
fab28b89 | 1478 | if (requested) |
fdeb8e15 | 1479 | dev_crit(&gdev->dev, |
58383c78 | 1480 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1481 | |
ff2b1359 LW |
1482 | /* |
1483 | * The gpiochip side puts its use of the device to rest here: | |
1484 | * if there are no userspace clients, the chardev and device will | |
1485 | * be removed, else it will be dangling until the last user is | |
1486 | * gone. | |
1487 | */ | |
111379dc | 1488 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
ff2b1359 | 1489 | put_device(&gdev->dev); |
d2876d08 DB |
1490 | } |
1491 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1492 | ||
0cf3292c LD |
1493 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1494 | { | |
1495 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1496 | ||
1497 | gpiochip_remove(chip); | |
1498 | } | |
1499 | ||
1500 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1501 | ||
1502 | { | |
1503 | struct gpio_chip **r = res; | |
1504 | ||
1505 | if (!r || !*r) { | |
1506 | WARN_ON(!r || !*r); | |
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | return *r == data; | |
1511 | } | |
1512 | ||
1513 | /** | |
689fd02e | 1514 | * devm_gpiochip_add_data() - Resource manager gpiochip_add_data() |
0cf3292c LD |
1515 | * @dev: the device pointer on which irq_chip belongs to. |
1516 | * @chip: the chip to register, with chip->base initialized | |
950d55f5 | 1517 | * @data: driver-private data associated with this chip |
0cf3292c | 1518 | * |
950d55f5 | 1519 | * Context: potentially before irqs will work |
0cf3292c LD |
1520 | * |
1521 | * The gpio chip automatically be released when the device is unbound. | |
950d55f5 TR |
1522 | * |
1523 | * Returns: | |
1524 | * A negative errno if the chip can't be registered, such as because the | |
1525 | * chip->base is invalid or already associated with a different chip. | |
1526 | * Otherwise it returns zero as a success code. | |
0cf3292c LD |
1527 | */ |
1528 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1529 | void *data) | |
1530 | { | |
1531 | struct gpio_chip **ptr; | |
1532 | int ret; | |
1533 | ||
1534 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1535 | GFP_KERNEL); | |
1536 | if (!ptr) | |
1537 | return -ENOMEM; | |
1538 | ||
1539 | ret = gpiochip_add_data(chip, data); | |
1540 | if (ret < 0) { | |
1541 | devres_free(ptr); | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | *ptr = chip; | |
1546 | devres_add(dev, ptr); | |
1547 | ||
1548 | return 0; | |
1549 | } | |
1550 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1551 | ||
1552 | /** | |
1553 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1554 | * @dev: device for which which resource was allocated | |
1555 | * @chip: the chip to remove | |
1556 | * | |
1557 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1558 | */ | |
1559 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1560 | { | |
1561 | int ret; | |
1562 | ||
1563 | ret = devres_release(dev, devm_gpio_chip_release, | |
1564 | devm_gpio_chip_match, chip); | |
3988d663 | 1565 | WARN_ON(ret); |
0cf3292c LD |
1566 | } |
1567 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1568 | ||
594fa265 GL |
1569 | /** |
1570 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1571 | * @data: data to pass to match function | |
950d55f5 | 1572 | * @match: Callback function to check gpio_chip |
594fa265 GL |
1573 | * |
1574 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1575 | * determined by a user supplied @match callback. The callback should return | |
1576 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1577 | * non-zero, this function will return to the caller and not iterate over any | |
1578 | * more gpio_chips. | |
1579 | */ | |
07ce8ec7 | 1580 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1581 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1582 | void *data)) |
594fa265 | 1583 | { |
ff2b1359 | 1584 | struct gpio_device *gdev; |
acf06ff7 | 1585 | struct gpio_chip *chip = NULL; |
594fa265 | 1586 | unsigned long flags; |
594fa265 GL |
1587 | |
1588 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1589 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1590 | if (gdev->chip && match(gdev->chip, data)) { |
1591 | chip = gdev->chip; | |
594fa265 | 1592 | break; |
acf06ff7 | 1593 | } |
ff2b1359 | 1594 | |
594fa265 GL |
1595 | spin_unlock_irqrestore(&gpio_lock, flags); |
1596 | ||
1597 | return chip; | |
1598 | } | |
8fa0c9bf | 1599 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1600 | |
79697ef9 AC |
1601 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1602 | { | |
1603 | const char *name = data; | |
1604 | ||
1605 | return !strcmp(chip->label, name); | |
1606 | } | |
1607 | ||
1608 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1609 | { | |
1610 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1611 | } | |
1612 | ||
14250520 LW |
1613 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1614 | ||
1615 | /* | |
1616 | * The following is irqchip helper code for gpiochips. | |
1617 | */ | |
1618 | ||
79b804cb MW |
1619 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1620 | { | |
dc7b0387 | 1621 | if (!gpiochip->irq.need_valid_mask) |
79b804cb MW |
1622 | return 0; |
1623 | ||
e4371f6e | 1624 | gpiochip->irq.valid_mask = gpiochip_allocate_mask(gpiochip); |
dc7b0387 | 1625 | if (!gpiochip->irq.valid_mask) |
79b804cb MW |
1626 | return -ENOMEM; |
1627 | ||
79b804cb MW |
1628 | return 0; |
1629 | } | |
1630 | ||
1631 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1632 | { | |
dc7b0387 TR |
1633 | kfree(gpiochip->irq.valid_mask); |
1634 | gpiochip->irq.valid_mask = NULL; | |
79b804cb MW |
1635 | } |
1636 | ||
64ff2c8e SB |
1637 | bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, |
1638 | unsigned int offset) | |
79b804cb | 1639 | { |
726cb3ba SB |
1640 | if (!gpiochip_line_is_valid(gpiochip, offset)) |
1641 | return false; | |
79b804cb | 1642 | /* No mask means all valid */ |
dc7b0387 | 1643 | if (likely(!gpiochip->irq.valid_mask)) |
79b804cb | 1644 | return true; |
dc7b0387 | 1645 | return test_bit(offset, gpiochip->irq.valid_mask); |
79b804cb | 1646 | } |
64ff2c8e | 1647 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid); |
79b804cb | 1648 | |
14250520 | 1649 | /** |
d245b3f9 | 1650 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
3f97d5fc LW |
1651 | * @gpiochip: the gpiochip to set the irqchip chain to |
1652 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1653 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1654 | * chained irqchip | |
1655 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1656 | * coming out of the gpiochip. If the interrupt is nested rather than |
1657 | * cascaded, pass NULL in this handler argument | |
14250520 | 1658 | */ |
d245b3f9 LW |
1659 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, |
1660 | struct irq_chip *irqchip, | |
6f79309a | 1661 | unsigned int parent_irq, |
d245b3f9 | 1662 | irq_flow_handler_t parent_handler) |
14250520 | 1663 | { |
83141a77 LW |
1664 | unsigned int offset; |
1665 | ||
f0fbe7bc | 1666 | if (!gpiochip->irq.domain) { |
83141a77 LW |
1667 | chip_err(gpiochip, "called %s before setting up irqchip\n", |
1668 | __func__); | |
1c8732bb LW |
1669 | return; |
1670 | } | |
1671 | ||
3f97d5fc LW |
1672 | if (parent_handler) { |
1673 | if (gpiochip->can_sleep) { | |
1674 | chip_err(gpiochip, | |
b1911710 | 1675 | "you cannot have chained interrupts on a chip that may sleep\n"); |
3f97d5fc LW |
1676 | return; |
1677 | } | |
3f97d5fc LW |
1678 | /* |
1679 | * The parent irqchip is already using the chip_data for this | |
1680 | * irqchip, so our callbacks simply use the handler_data. | |
1681 | */ | |
f7f87753 TG |
1682 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1683 | gpiochip); | |
25e4fe92 | 1684 | |
39e5f096 TR |
1685 | gpiochip->irq.parents = &parent_irq; |
1686 | gpiochip->irq.num_parents = 1; | |
3f97d5fc | 1687 | } |
83141a77 LW |
1688 | |
1689 | /* Set the parent IRQ for all affected IRQs */ | |
79b804cb MW |
1690 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1691 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1692 | continue; | |
f0fbe7bc | 1693 | irq_set_parent(irq_find_mapping(gpiochip->irq.domain, offset), |
83141a77 | 1694 | parent_irq); |
79b804cb | 1695 | } |
14250520 | 1696 | } |
d245b3f9 LW |
1697 | |
1698 | /** | |
1699 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip | |
1700 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1701 | * @irqchip: the irqchip to chain to the gpiochip | |
1702 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1703 | * chained irqchip | |
1704 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
1705 | * coming out of the gpiochip. If the interrupt is nested rather than | |
1706 | * cascaded, pass NULL in this handler argument | |
1707 | */ | |
1708 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1709 | struct irq_chip *irqchip, | |
6f79309a | 1710 | unsigned int parent_irq, |
d245b3f9 LW |
1711 | irq_flow_handler_t parent_handler) |
1712 | { | |
60ed54ca TR |
1713 | if (gpiochip->irq.threaded) { |
1714 | chip_err(gpiochip, "tried to chain a threaded gpiochip\n"); | |
1715 | return; | |
1716 | } | |
1717 | ||
d245b3f9 LW |
1718 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, |
1719 | parent_handler); | |
1720 | } | |
14250520 LW |
1721 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
1722 | ||
d245b3f9 LW |
1723 | /** |
1724 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip | |
1725 | * @gpiochip: the gpiochip to set the irqchip nested handler to | |
1726 | * @irqchip: the irqchip to nest to the gpiochip | |
1727 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1728 | * nested irqchip | |
1729 | */ | |
1730 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, | |
1731 | struct irq_chip *irqchip, | |
6f79309a | 1732 | unsigned int parent_irq) |
d245b3f9 | 1733 | { |
d245b3f9 LW |
1734 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, |
1735 | NULL); | |
1736 | } | |
1737 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); | |
1738 | ||
14250520 LW |
1739 | /** |
1740 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1741 | * @d: the irqdomain used by this irqchip | |
1742 | * @irq: the global irq number used by this GPIO irqchip irq | |
1743 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1744 | * | |
1745 | * This function will set up the mapping for a certain IRQ line on a | |
1746 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1747 | * stored inside the gpiochip. | |
1748 | */ | |
1b95b4eb TR |
1749 | int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
1750 | irq_hw_number_t hwirq) | |
14250520 LW |
1751 | { |
1752 | struct gpio_chip *chip = d->host_data; | |
e0d89728 | 1753 | int err = 0; |
14250520 | 1754 | |
dc749a09 GS |
1755 | if (!gpiochip_irqchip_irq_valid(chip, hwirq)) |
1756 | return -ENXIO; | |
1757 | ||
14250520 | 1758 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1759 | /* |
1760 | * This lock class tells lockdep that GPIO irqs are in a different | |
1761 | * category than their parents, so it won't report false recursion. | |
1762 | */ | |
39c3fd58 | 1763 | irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key); |
c7a0aa59 | 1764 | irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler); |
d245b3f9 | 1765 | /* Chips that use nested thread handlers have them marked */ |
60ed54ca | 1766 | if (chip->irq.threaded) |
1c8732bb | 1767 | irq_set_nested_thread(irq, 1); |
14250520 | 1768 | irq_set_noprobe(irq); |
23393d49 | 1769 | |
e0d89728 TR |
1770 | if (chip->irq.num_parents == 1) |
1771 | err = irq_set_parent(irq, chip->irq.parents[0]); | |
1772 | else if (chip->irq.map) | |
1773 | err = irq_set_parent(irq, chip->irq.map[hwirq]); | |
1774 | ||
1775 | if (err < 0) | |
1776 | return err; | |
1777 | ||
1333b90f LW |
1778 | /* |
1779 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1780 | * is passed as default type. | |
1781 | */ | |
3634eeb0 TR |
1782 | if (chip->irq.default_type != IRQ_TYPE_NONE) |
1783 | irq_set_irq_type(irq, chip->irq.default_type); | |
14250520 LW |
1784 | |
1785 | return 0; | |
1786 | } | |
1b95b4eb | 1787 | EXPORT_SYMBOL_GPL(gpiochip_irq_map); |
14250520 | 1788 | |
1b95b4eb | 1789 | void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
c3626fde | 1790 | { |
1c8732bb LW |
1791 | struct gpio_chip *chip = d->host_data; |
1792 | ||
60ed54ca | 1793 | if (chip->irq.threaded) |
1c8732bb | 1794 | irq_set_nested_thread(irq, 0); |
c3626fde LW |
1795 | irq_set_chip_and_handler(irq, NULL, NULL); |
1796 | irq_set_chip_data(irq, NULL); | |
1797 | } | |
1b95b4eb | 1798 | EXPORT_SYMBOL_GPL(gpiochip_irq_unmap); |
c3626fde | 1799 | |
14250520 LW |
1800 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1801 | .map = gpiochip_irq_map, | |
c3626fde | 1802 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1803 | /* Virtually all GPIO irqchips are twocell:ed */ |
1804 | .xlate = irq_domain_xlate_twocell, | |
1805 | }; | |
1806 | ||
4e6b8238 | 1807 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) |
14250520 | 1808 | { |
4e6b8238 HV |
1809 | if (!gpiochip_irqchip_irq_valid(chip, offset)) |
1810 | return -ENXIO; | |
5b76e79c | 1811 | |
4e6b8238 | 1812 | return irq_create_mapping(chip->irq.domain, offset); |
14250520 LW |
1813 | } |
1814 | ||
4e6b8238 | 1815 | static int gpiochip_irq_reqres(struct irq_data *d) |
14250520 LW |
1816 | { |
1817 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1818 | ||
4e6b8238 | 1819 | return gpiochip_reqres_irq(chip, d->hwirq); |
14250520 LW |
1820 | } |
1821 | ||
4e6b8238 | 1822 | static void gpiochip_irq_relres(struct irq_data *d) |
14250520 | 1823 | { |
4e6b8238 | 1824 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
e0d89728 | 1825 | |
4e6b8238 | 1826 | gpiochip_relres_irq(chip, d->hwirq); |
14250520 LW |
1827 | } |
1828 | ||
e0d89728 TR |
1829 | /** |
1830 | * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip | |
1831 | * @gpiochip: the GPIO chip to add the IRQ chip to | |
39c3fd58 AL |
1832 | * @lock_key: lockdep class for IRQ lock |
1833 | * @request_key: lockdep class for IRQ request | |
e0d89728 | 1834 | */ |
959bc7b2 | 1835 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
1836 | struct lock_class_key *lock_key, |
1837 | struct lock_class_key *request_key) | |
e0d89728 TR |
1838 | { |
1839 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1840 | const struct irq_domain_ops *ops; | |
1841 | struct device_node *np; | |
1842 | unsigned int type; | |
1843 | unsigned int i; | |
1844 | ||
1845 | if (!irqchip) | |
1846 | return 0; | |
1847 | ||
1848 | if (gpiochip->irq.parent_handler && gpiochip->can_sleep) { | |
b1911710 | 1849 | chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n"); |
e0d89728 TR |
1850 | return -EINVAL; |
1851 | } | |
1852 | ||
1853 | np = gpiochip->gpiodev->dev.of_node; | |
1854 | type = gpiochip->irq.default_type; | |
1855 | ||
1856 | /* | |
1857 | * Specifying a default trigger is a terrible idea if DT or ACPI is | |
1858 | * used to configure the interrupts, as you may end up with | |
1859 | * conflicting triggers. Tell the user, and reset to NONE. | |
1860 | */ | |
1861 | if (WARN(np && type != IRQ_TYPE_NONE, | |
1862 | "%s: Ignoring %u default trigger\n", np->full_name, type)) | |
1863 | type = IRQ_TYPE_NONE; | |
1864 | ||
1865 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { | |
1866 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1867 | "Ignoring %u default trigger\n", type); | |
1868 | type = IRQ_TYPE_NONE; | |
1869 | } | |
1870 | ||
1871 | gpiochip->to_irq = gpiochip_to_irq; | |
1872 | gpiochip->irq.default_type = type; | |
959bc7b2 | 1873 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 1874 | gpiochip->irq.request_key = request_key; |
e0d89728 TR |
1875 | |
1876 | if (gpiochip->irq.domain_ops) | |
1877 | ops = gpiochip->irq.domain_ops; | |
1878 | else | |
1879 | ops = &gpiochip_domain_ops; | |
1880 | ||
1881 | gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, | |
8302cf58 TR |
1882 | gpiochip->irq.first, |
1883 | ops, gpiochip); | |
e0d89728 TR |
1884 | if (!gpiochip->irq.domain) |
1885 | return -EINVAL; | |
1886 | ||
1887 | /* | |
1888 | * It is possible for a driver to override this, but only if the | |
1889 | * alternative functions are both implemented. | |
1890 | */ | |
1891 | if (!irqchip->irq_request_resources && | |
1892 | !irqchip->irq_release_resources) { | |
1893 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1894 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1895 | } | |
1896 | ||
1897 | if (gpiochip->irq.parent_handler) { | |
1898 | void *data = gpiochip->irq.parent_handler_data ?: gpiochip; | |
1899 | ||
1900 | for (i = 0; i < gpiochip->irq.num_parents; i++) { | |
1901 | /* | |
1902 | * The parent IRQ chip is already using the chip_data | |
1903 | * for this IRQ chip, so our callbacks simply use the | |
1904 | * handler_data. | |
1905 | */ | |
1906 | irq_set_chained_handler_and_data(gpiochip->irq.parents[i], | |
1907 | gpiochip->irq.parent_handler, | |
1908 | data); | |
1909 | } | |
e0d89728 TR |
1910 | } |
1911 | ||
1912 | acpi_gpiochip_request_interrupts(gpiochip); | |
1913 | ||
1914 | return 0; | |
1915 | } | |
1916 | ||
14250520 LW |
1917 | /** |
1918 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1919 | * @gpiochip: the gpiochip to remove the irqchip from | |
1920 | * | |
1921 | * This is called only from gpiochip_remove() | |
1922 | */ | |
1923 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1924 | { | |
39e5f096 | 1925 | unsigned int offset; |
c3626fde | 1926 | |
afa82fab MW |
1927 | acpi_gpiochip_free_interrupts(gpiochip); |
1928 | ||
e0d89728 | 1929 | if (gpiochip->irq.chip && gpiochip->irq.parent_handler) { |
39e5f096 TR |
1930 | struct gpio_irq_chip *irq = &gpiochip->irq; |
1931 | unsigned int i; | |
1932 | ||
1933 | for (i = 0; i < irq->num_parents; i++) | |
1934 | irq_set_chained_handler_and_data(irq->parents[i], | |
1935 | NULL, NULL); | |
25e4fe92 DES |
1936 | } |
1937 | ||
c3626fde | 1938 | /* Remove all IRQ mappings and delete the domain */ |
f0fbe7bc | 1939 | if (gpiochip->irq.domain) { |
39e5f096 TR |
1940 | unsigned int irq; |
1941 | ||
79b804cb MW |
1942 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1943 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1944 | continue; | |
f0fbe7bc TR |
1945 | |
1946 | irq = irq_find_mapping(gpiochip->irq.domain, offset); | |
1947 | irq_dispose_mapping(irq); | |
79b804cb | 1948 | } |
f0fbe7bc TR |
1949 | |
1950 | irq_domain_remove(gpiochip->irq.domain); | |
c3626fde | 1951 | } |
14250520 | 1952 | |
da80ff81 TR |
1953 | if (gpiochip->irq.chip) { |
1954 | gpiochip->irq.chip->irq_request_resources = NULL; | |
1955 | gpiochip->irq.chip->irq_release_resources = NULL; | |
1956 | gpiochip->irq.chip = NULL; | |
14250520 | 1957 | } |
79b804cb MW |
1958 | |
1959 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
1960 | } |
1961 | ||
1962 | /** | |
739e6f59 | 1963 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
14250520 LW |
1964 | * @gpiochip: the gpiochip to add the irqchip to |
1965 | * @irqchip: the irqchip to add to the gpiochip | |
1966 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1967 | * allocate gpiochip irqs from | |
1968 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1969 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1970 | * to have the core avoid setting up any default type in the hardware. | |
60ed54ca | 1971 | * @threaded: whether this irqchip uses a nested thread handler |
39c3fd58 AL |
1972 | * @lock_key: lockdep class for IRQ lock |
1973 | * @request_key: lockdep class for IRQ request | |
14250520 LW |
1974 | * |
1975 | * This function closely associates a certain irqchip with a certain | |
1976 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1977 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1978 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1979 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1980 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1981 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1982 | * translation. The gpiochip will need to be initialized and registered | |
1983 | * before calling this function. | |
1984 | * | |
c3626fde LW |
1985 | * This function will handle two cell:ed simple IRQs and assumes all |
1986 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1987 | * need to be open coded. |
1988 | */ | |
739e6f59 LW |
1989 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
1990 | struct irq_chip *irqchip, | |
1991 | unsigned int first_irq, | |
1992 | irq_flow_handler_t handler, | |
1993 | unsigned int type, | |
60ed54ca | 1994 | bool threaded, |
39c3fd58 AL |
1995 | struct lock_class_key *lock_key, |
1996 | struct lock_class_key *request_key) | |
14250520 LW |
1997 | { |
1998 | struct device_node *of_node; | |
14250520 LW |
1999 | |
2000 | if (!gpiochip || !irqchip) | |
2001 | return -EINVAL; | |
2002 | ||
58383c78 | 2003 | if (!gpiochip->parent) { |
14250520 LW |
2004 | pr_err("missing gpiochip .dev parent pointer\n"); |
2005 | return -EINVAL; | |
2006 | } | |
60ed54ca | 2007 | gpiochip->irq.threaded = threaded; |
58383c78 | 2008 | of_node = gpiochip->parent->of_node; |
14250520 LW |
2009 | #ifdef CONFIG_OF_GPIO |
2010 | /* | |
20a8a968 | 2011 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
2012 | * FIXME: get rid of this and use gpiochip->parent->of_node |
2013 | * everywhere | |
14250520 LW |
2014 | */ |
2015 | if (gpiochip->of_node) | |
2016 | of_node = gpiochip->of_node; | |
2017 | #endif | |
332e99d5 | 2018 | /* |
0a1e0053 | 2019 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
2020 | * used to configure the interrupts, as you may end-up with |
2021 | * conflicting triggers. Tell the user, and reset to NONE. | |
2022 | */ | |
2023 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
7eb6ce2f | 2024 | "%pOF: Ignoring %d default trigger\n", of_node, type)) |
332e99d5 | 2025 | type = IRQ_TYPE_NONE; |
0a1e0053 MW |
2026 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
2027 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
2028 | "Ignoring %d default trigger\n", type); | |
2029 | type = IRQ_TYPE_NONE; | |
2030 | } | |
332e99d5 | 2031 | |
da80ff81 | 2032 | gpiochip->irq.chip = irqchip; |
c7a0aa59 | 2033 | gpiochip->irq.handler = handler; |
3634eeb0 | 2034 | gpiochip->irq.default_type = type; |
14250520 | 2035 | gpiochip->to_irq = gpiochip_to_irq; |
ca9df053 | 2036 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 2037 | gpiochip->irq.request_key = request_key; |
f0fbe7bc | 2038 | gpiochip->irq.domain = irq_domain_add_simple(of_node, |
14250520 LW |
2039 | gpiochip->ngpio, first_irq, |
2040 | &gpiochip_domain_ops, gpiochip); | |
f0fbe7bc | 2041 | if (!gpiochip->irq.domain) { |
da80ff81 | 2042 | gpiochip->irq.chip = NULL; |
14250520 LW |
2043 | return -EINVAL; |
2044 | } | |
8b67a1f0 RV |
2045 | |
2046 | /* | |
2047 | * It is possible for a driver to override this, but only if the | |
2048 | * alternative functions are both implemented. | |
2049 | */ | |
2050 | if (!irqchip->irq_request_resources && | |
2051 | !irqchip->irq_release_resources) { | |
2052 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
2053 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
2054 | } | |
14250520 | 2055 | |
afa82fab MW |
2056 | acpi_gpiochip_request_interrupts(gpiochip); |
2057 | ||
14250520 LW |
2058 | return 0; |
2059 | } | |
739e6f59 | 2060 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
14250520 LW |
2061 | |
2062 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
2063 | ||
959bc7b2 | 2064 | static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
2065 | struct lock_class_key *lock_key, |
2066 | struct lock_class_key *request_key) | |
e0d89728 TR |
2067 | { |
2068 | return 0; | |
2069 | } | |
2070 | ||
14250520 | 2071 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} |
79b804cb MW |
2072 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
2073 | { | |
2074 | return 0; | |
2075 | } | |
2076 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
2077 | { } | |
14250520 LW |
2078 | |
2079 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
2080 | ||
c771c2f4 JG |
2081 | /** |
2082 | * gpiochip_generic_request() - request the gpio function for a pin | |
2083 | * @chip: the gpiochip owning the GPIO | |
2084 | * @offset: the offset of the GPIO to request for GPIO function | |
2085 | */ | |
2086 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
2087 | { | |
a9a1d2a7 | 2088 | return pinctrl_gpio_request(chip->gpiodev->base + offset); |
c771c2f4 JG |
2089 | } |
2090 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
2091 | ||
2092 | /** | |
2093 | * gpiochip_generic_free() - free the gpio function from a pin | |
2094 | * @chip: the gpiochip to request the gpio function for | |
2095 | * @offset: the offset of the GPIO to free from GPIO function | |
2096 | */ | |
2097 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
2098 | { | |
a9a1d2a7 | 2099 | pinctrl_gpio_free(chip->gpiodev->base + offset); |
c771c2f4 JG |
2100 | } |
2101 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
2102 | ||
2956b5d9 MW |
2103 | /** |
2104 | * gpiochip_generic_config() - apply configuration for a pin | |
2105 | * @chip: the gpiochip owning the GPIO | |
2106 | * @offset: the offset of the GPIO to apply the configuration | |
2107 | * @config: the configuration to be applied | |
2108 | */ | |
2109 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, | |
2110 | unsigned long config) | |
2111 | { | |
2112 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); | |
2113 | } | |
2114 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); | |
2115 | ||
f23f1516 | 2116 | #ifdef CONFIG_PINCTRL |
165adc9c | 2117 | |
586a87e6 CR |
2118 | /** |
2119 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
2120 | * @chip: the gpiochip to add the range for | |
d32651f6 | 2121 | * @pctldev: the pin controller to map to |
586a87e6 CR |
2122 | * @gpio_offset: the start offset in the current gpio_chip number space |
2123 | * @pin_group: name of the pin group inside the pin controller | |
973c1714 CL |
2124 | * |
2125 | * Calling this function directly from a DeviceTree-supported | |
2126 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2127 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2128 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
586a87e6 CR |
2129 | */ |
2130 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
2131 | struct pinctrl_dev *pctldev, | |
2132 | unsigned int gpio_offset, const char *pin_group) | |
2133 | { | |
2134 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2135 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
2136 | int ret; |
2137 | ||
2138 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
2139 | if (!pin_range) { | |
1a2a99c6 | 2140 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
2141 | return -ENOMEM; |
2142 | } | |
2143 | ||
2144 | /* Use local offset as range ID */ | |
2145 | pin_range->range.id = gpio_offset; | |
2146 | pin_range->range.gc = chip; | |
2147 | pin_range->range.name = chip->label; | |
fdeb8e15 | 2148 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
2149 | pin_range->pctldev = pctldev; |
2150 | ||
2151 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
2152 | &pin_range->range.pins, | |
2153 | &pin_range->range.npins); | |
61c6375d MN |
2154 | if (ret < 0) { |
2155 | kfree(pin_range); | |
586a87e6 | 2156 | return ret; |
61c6375d | 2157 | } |
586a87e6 CR |
2158 | |
2159 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
2160 | ||
1a2a99c6 AS |
2161 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
2162 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
2163 | pinctrl_dev_get_devname(pctldev), pin_group); |
2164 | ||
20ec3e39 | 2165 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
2166 | |
2167 | return 0; | |
2168 | } | |
2169 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
2170 | ||
3f0f8670 LW |
2171 | /** |
2172 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
2173 | * @chip: the gpiochip to add the range for | |
950d55f5 | 2174 | * @pinctl_name: the dev_name() of the pin controller to map to |
316511c0 LW |
2175 | * @gpio_offset: the start offset in the current gpio_chip number space |
2176 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
2177 | * @npins: the number of pins from the offset of each pin space (GPIO and |
2178 | * pin controller) to accumulate in this range | |
950d55f5 TR |
2179 | * |
2180 | * Returns: | |
2181 | * 0 on success, or a negative error-code on failure. | |
973c1714 CL |
2182 | * |
2183 | * Calling this function directly from a DeviceTree-supported | |
2184 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2185 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2186 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
3f0f8670 | 2187 | */ |
1e63d7b9 | 2188 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 2189 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 2190 | unsigned int npins) |
f23f1516 SH |
2191 | { |
2192 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2193 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 2194 | int ret; |
f23f1516 | 2195 | |
3f0f8670 | 2196 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 2197 | if (!pin_range) { |
1a2a99c6 | 2198 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 2199 | return -ENOMEM; |
f23f1516 SH |
2200 | } |
2201 | ||
3f0f8670 | 2202 | /* Use local offset as range ID */ |
316511c0 | 2203 | pin_range->range.id = gpio_offset; |
3f0f8670 | 2204 | pin_range->range.gc = chip; |
f23f1516 | 2205 | pin_range->range.name = chip->label; |
fdeb8e15 | 2206 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 2207 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 2208 | pin_range->range.npins = npins; |
192c369c | 2209 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 2210 | &pin_range->range); |
8f23ca1a | 2211 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 2212 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 2213 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 2214 | kfree(pin_range); |
b4d4b1f0 | 2215 | return ret; |
3f0f8670 | 2216 | } |
1a2a99c6 AS |
2217 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
2218 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
2219 | pinctl_name, |
2220 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 2221 | |
20ec3e39 | 2222 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
2223 | |
2224 | return 0; | |
f23f1516 | 2225 | } |
165adc9c | 2226 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 2227 | |
3f0f8670 LW |
2228 | /** |
2229 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
2230 | * @chip: the chip to remove all the mappings for | |
2231 | */ | |
f23f1516 SH |
2232 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
2233 | { | |
2234 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 2235 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 2236 | |
20ec3e39 | 2237 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
2238 | list_del(&pin_range->node); |
2239 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
2240 | &pin_range->range); | |
3f0f8670 | 2241 | kfree(pin_range); |
f23f1516 SH |
2242 | } |
2243 | } | |
165adc9c LW |
2244 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
2245 | ||
2246 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 2247 | |
d2876d08 DB |
2248 | /* These "optional" allocation calls help prevent drivers from stomping |
2249 | * on each other, and help provide better diagnostics in debugfs. | |
2250 | * They're called even less than the "set direction" calls. | |
2251 | */ | |
fac9d885 | 2252 | static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
d2876d08 | 2253 | { |
fdeb8e15 | 2254 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 2255 | int status; |
d2876d08 | 2256 | unsigned long flags; |
3789f5ac | 2257 | unsigned offset; |
d2876d08 | 2258 | |
bcabdef1 AC |
2259 | spin_lock_irqsave(&gpio_lock, flags); |
2260 | ||
d2876d08 | 2261 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 2262 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
2263 | */ |
2264 | ||
2265 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
2266 | desc_set_label(desc, label ? : "?"); | |
2267 | status = 0; | |
438d8908 | 2268 | } else { |
d2876d08 | 2269 | status = -EBUSY; |
7460db56 | 2270 | goto done; |
35e8bb51 DB |
2271 | } |
2272 | ||
2273 | if (chip->request) { | |
2274 | /* chip->request may sleep */ | |
2275 | spin_unlock_irqrestore(&gpio_lock, flags); | |
3789f5ac BD |
2276 | offset = gpio_chip_hwgpio(desc); |
2277 | if (gpiochip_line_is_valid(chip, offset)) | |
2278 | status = chip->request(chip, offset); | |
2279 | else | |
2280 | status = -EINVAL; | |
35e8bb51 DB |
2281 | spin_lock_irqsave(&gpio_lock, flags); |
2282 | ||
2283 | if (status < 0) { | |
2284 | desc_set_label(desc, NULL); | |
35e8bb51 | 2285 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 2286 | goto done; |
35e8bb51 | 2287 | } |
438d8908 | 2288 | } |
80b0a602 MN |
2289 | if (chip->get_direction) { |
2290 | /* chip->get_direction may sleep */ | |
2291 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2292 | gpiod_get_direction(desc); |
80b0a602 MN |
2293 | spin_lock_irqsave(&gpio_lock, flags); |
2294 | } | |
77c2d792 MW |
2295 | done: |
2296 | spin_unlock_irqrestore(&gpio_lock, flags); | |
2297 | return status; | |
2298 | } | |
2299 | ||
fdeb8e15 LW |
2300 | /* |
2301 | * This descriptor validation needs to be inserted verbatim into each | |
2302 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
2303 | * macro to avoid endless duplication. If the desc is NULL it is an |
2304 | * optional GPIO and calls should just bail out. | |
fdeb8e15 | 2305 | */ |
a746a232 RV |
2306 | static int validate_desc(const struct gpio_desc *desc, const char *func) |
2307 | { | |
2308 | if (!desc) | |
2309 | return 0; | |
2310 | if (IS_ERR(desc)) { | |
2311 | pr_warn("%s: invalid GPIO (errorpointer)\n", func); | |
2312 | return PTR_ERR(desc); | |
2313 | } | |
2314 | if (!desc->gdev) { | |
2315 | pr_warn("%s: invalid GPIO (no device)\n", func); | |
2316 | return -EINVAL; | |
2317 | } | |
2318 | if (!desc->gdev->chip) { | |
2319 | dev_warn(&desc->gdev->dev, | |
2320 | "%s: backing chip is gone\n", func); | |
2321 | return 0; | |
2322 | } | |
2323 | return 1; | |
2324 | } | |
2325 | ||
fdeb8e15 | 2326 | #define VALIDATE_DESC(desc) do { \ |
a746a232 RV |
2327 | int __valid = validate_desc(desc, __func__); \ |
2328 | if (__valid <= 0) \ | |
2329 | return __valid; \ | |
2330 | } while (0) | |
fdeb8e15 LW |
2331 | |
2332 | #define VALIDATE_DESC_VOID(desc) do { \ | |
a746a232 RV |
2333 | int __valid = validate_desc(desc, __func__); \ |
2334 | if (__valid <= 0) \ | |
fdeb8e15 | 2335 | return; \ |
a746a232 | 2336 | } while (0) |
fdeb8e15 | 2337 | |
0eb4c6c2 | 2338 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
2339 | { |
2340 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 2341 | struct gpio_device *gdev; |
77c2d792 | 2342 | |
fdeb8e15 LW |
2343 | VALIDATE_DESC(desc); |
2344 | gdev = desc->gdev; | |
77c2d792 | 2345 | |
fdeb8e15 | 2346 | if (try_module_get(gdev->owner)) { |
fac9d885 | 2347 | status = gpiod_request_commit(desc, label); |
77c2d792 | 2348 | if (status < 0) |
fdeb8e15 | 2349 | module_put(gdev->owner); |
33a68e86 LW |
2350 | else |
2351 | get_device(&gdev->dev); | |
77c2d792 MW |
2352 | } |
2353 | ||
d2876d08 | 2354 | if (status) |
7589e59f | 2355 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2356 | |
d2876d08 DB |
2357 | return status; |
2358 | } | |
372e722e | 2359 | |
fac9d885 | 2360 | static bool gpiod_free_commit(struct gpio_desc *desc) |
d2876d08 | 2361 | { |
77c2d792 | 2362 | bool ret = false; |
d2876d08 | 2363 | unsigned long flags; |
35e8bb51 | 2364 | struct gpio_chip *chip; |
d2876d08 | 2365 | |
3d599d1c UKK |
2366 | might_sleep(); |
2367 | ||
372e722e | 2368 | gpiod_unexport(desc); |
d8f388d8 | 2369 | |
d2876d08 DB |
2370 | spin_lock_irqsave(&gpio_lock, flags); |
2371 | ||
fdeb8e15 | 2372 | chip = desc->gdev->chip; |
35e8bb51 DB |
2373 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2374 | if (chip->free) { | |
2375 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2376 | might_sleep_if(chip->can_sleep); |
372e722e | 2377 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2378 | spin_lock_irqsave(&gpio_lock, flags); |
2379 | } | |
d2876d08 | 2380 | desc_set_label(desc, NULL); |
07697461 | 2381 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2382 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2383 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2384 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2385 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2386 | ret = true; |
2387 | } | |
d2876d08 DB |
2388 | |
2389 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2390 | return ret; |
2391 | } | |
2392 | ||
0eb4c6c2 | 2393 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2394 | { |
fac9d885 | 2395 | if (desc && desc->gdev && gpiod_free_commit(desc)) { |
fdeb8e15 | 2396 | module_put(desc->gdev->owner); |
33a68e86 LW |
2397 | put_device(&desc->gdev->dev); |
2398 | } else { | |
77c2d792 | 2399 | WARN_ON(extra_checks); |
33a68e86 | 2400 | } |
d2876d08 | 2401 | } |
372e722e | 2402 | |
d2876d08 DB |
2403 | /** |
2404 | * gpiochip_is_requested - return string iff signal was requested | |
2405 | * @chip: controller managing the signal | |
2406 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2407 | * | |
2408 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2409 | * The string returned is the label passed to gpio_request(); if none has been |
2410 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2411 | * |
2412 | * This function is for use by GPIO controller drivers. The label can | |
2413 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2414 | * can help avoid accidentally multiplexing it to another controller. | |
2415 | */ | |
2416 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2417 | { | |
6c0b4e6c | 2418 | struct gpio_desc *desc; |
d2876d08 | 2419 | |
48b5953e | 2420 | if (offset >= chip->ngpio) |
d2876d08 | 2421 | return NULL; |
6c0b4e6c | 2422 | |
1c3cdb18 | 2423 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2424 | |
372e722e | 2425 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2426 | return NULL; |
372e722e | 2427 | return desc->label; |
d2876d08 DB |
2428 | } |
2429 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2430 | ||
77c2d792 MW |
2431 | /** |
2432 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
950d55f5 TR |
2433 | * @chip: GPIO chip |
2434 | * @hwnum: hardware number of the GPIO for which to request the descriptor | |
77c2d792 MW |
2435 | * @label: label for the GPIO |
2436 | * | |
2437 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2438 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2439 | * function will not increase reference count of the GPIO chip module. This | |
2440 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2441 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
950d55f5 TR |
2442 | * |
2443 | * Returns: | |
2444 | * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error | |
2445 | * code on failure. | |
77c2d792 | 2446 | */ |
abdc08a3 AC |
2447 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2448 | const char *label) | |
77c2d792 | 2449 | { |
abdc08a3 AC |
2450 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2451 | int err; | |
77c2d792 | 2452 | |
abdc08a3 AC |
2453 | if (IS_ERR(desc)) { |
2454 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2455 | return desc; | |
2456 | } | |
2457 | ||
fac9d885 | 2458 | err = gpiod_request_commit(desc, label); |
abdc08a3 AC |
2459 | if (err < 0) |
2460 | return ERR_PTR(err); | |
77c2d792 | 2461 | |
abdc08a3 | 2462 | return desc; |
77c2d792 | 2463 | } |
f7d4ad98 | 2464 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2465 | |
2466 | /** | |
2467 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2468 | * @desc: GPIO descriptor to free | |
2469 | * | |
2470 | * Function frees the given GPIO requested previously with | |
2471 | * gpiochip_request_own_desc(). | |
2472 | */ | |
2473 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2474 | { | |
2475 | if (desc) | |
fac9d885 | 2476 | gpiod_free_commit(desc); |
77c2d792 | 2477 | } |
f7d4ad98 | 2478 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2479 | |
fdeb8e15 LW |
2480 | /* |
2481 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2482 | * some cases this is done in early boot, before IRQs are enabled. |
2483 | * | |
2484 | * As a rule these aren't called more than once (except for drivers | |
2485 | * using the open-drain emulation idiom) so these are natural places | |
2486 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2487 | * rely on gpio_request() having been called beforehand. | |
2488 | */ | |
2489 | ||
79a9becd AC |
2490 | /** |
2491 | * gpiod_direction_input - set the GPIO direction to input | |
2492 | * @desc: GPIO to set to input | |
2493 | * | |
2494 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2495 | * be called safely on it. | |
2496 | * | |
2497 | * Return 0 in case of success, else an error code. | |
2498 | */ | |
2499 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2500 | { |
d2876d08 | 2501 | struct gpio_chip *chip; |
d2876d08 DB |
2502 | int status = -EINVAL; |
2503 | ||
fdeb8e15 LW |
2504 | VALIDATE_DESC(desc); |
2505 | chip = desc->gdev->chip; | |
bcabdef1 | 2506 | |
be1a4b13 | 2507 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2508 | gpiod_warn(desc, |
2509 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2510 | __func__); |
be1a4b13 LW |
2511 | return -EIO; |
2512 | } | |
2513 | ||
d82da797 | 2514 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2515 | if (status == 0) |
2516 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2517 | |
372e722e | 2518 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2519 | |
d2876d08 DB |
2520 | return status; |
2521 | } | |
79a9becd | 2522 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2523 | |
2956b5d9 MW |
2524 | static int gpio_set_drive_single_ended(struct gpio_chip *gc, unsigned offset, |
2525 | enum pin_config_param mode) | |
2526 | { | |
2527 | unsigned long config = { PIN_CONF_PACKED(mode, 0) }; | |
2528 | ||
2529 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; | |
2530 | } | |
2531 | ||
fac9d885 | 2532 | static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
d2876d08 | 2533 | { |
c663e5f5 | 2534 | struct gpio_chip *gc = desc->gdev->chip; |
ad17731d | 2535 | int val = !!value; |
c663e5f5 | 2536 | int ret; |
d2876d08 | 2537 | |
c663e5f5 | 2538 | if (!gc->set || !gc->direction_output) { |
6424de5a MB |
2539 | gpiod_warn(desc, |
2540 | "%s: missing set() or direction_output() operations\n", | |
2541 | __func__); | |
be1a4b13 LW |
2542 | return -EIO; |
2543 | } | |
2544 | ||
ad17731d | 2545 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); |
c663e5f5 | 2546 | if (!ret) |
d2876d08 | 2547 | set_bit(FLAG_IS_OUT, &desc->flags); |
ad17731d | 2548 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
c663e5f5 LW |
2549 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2550 | return ret; | |
d2876d08 | 2551 | } |
ef70bbe1 PZ |
2552 | |
2553 | /** | |
2554 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2555 | * @desc: GPIO to set to output | |
2556 | * @value: initial output value of the GPIO | |
2557 | * | |
2558 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2559 | * be called safely on it. The initial value of the output must be specified | |
2560 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2561 | * | |
2562 | * Return 0 in case of success, else an error code. | |
2563 | */ | |
2564 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2565 | { | |
fdeb8e15 | 2566 | VALIDATE_DESC(desc); |
fac9d885 | 2567 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 PZ |
2568 | } |
2569 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2570 | ||
2571 | /** | |
90df4fe0 | 2572 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2573 | * @desc: GPIO to set to output |
2574 | * @value: initial output value of the GPIO | |
2575 | * | |
2576 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2577 | * be called safely on it. The initial value of the output must be specified | |
2578 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2579 | * account. | |
2580 | * | |
2581 | * Return 0 in case of success, else an error code. | |
2582 | */ | |
2583 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2584 | { | |
30322bcf | 2585 | struct gpio_chip *gc; |
02e47980 LW |
2586 | int ret; |
2587 | ||
fdeb8e15 | 2588 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2589 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2590 | value = !value; | |
ad17731d LW |
2591 | else |
2592 | value = !!value; | |
02e47980 LW |
2593 | |
2594 | /* GPIOs used for IRQs shall not be set as output */ | |
2595 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
2596 | gpiod_err(desc, | |
2597 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2598 | __func__); | |
2599 | return -EIO; | |
2600 | } | |
2601 | ||
30322bcf | 2602 | gc = desc->gdev->chip; |
02e47980 LW |
2603 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2604 | /* First see if we can enable open drain in hardware */ | |
2605 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2606 | PIN_CONFIG_DRIVE_OPEN_DRAIN); | |
2607 | if (!ret) | |
2608 | goto set_output_value; | |
2609 | /* Emulate open drain by not actively driving the line high */ | |
2610 | if (value) | |
2611 | return gpiod_direction_input(desc); | |
2612 | } | |
2613 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2614 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2615 | PIN_CONFIG_DRIVE_OPEN_SOURCE); | |
2616 | if (!ret) | |
2617 | goto set_output_value; | |
2618 | /* Emulate open source by not actively driving the line low */ | |
2619 | if (!value) | |
2620 | return gpiod_direction_input(desc); | |
2621 | } else { | |
2622 | gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2623 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
2624 | } | |
2625 | ||
2626 | set_output_value: | |
fac9d885 | 2627 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 | 2628 | } |
79a9becd | 2629 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2630 | |
c4b5be98 | 2631 | /** |
950d55f5 TR |
2632 | * gpiod_set_debounce - sets @debounce time for a GPIO |
2633 | * @desc: descriptor of the GPIO for which to set debounce time | |
2634 | * @debounce: debounce time in microseconds | |
65d87656 | 2635 | * |
950d55f5 TR |
2636 | * Returns: |
2637 | * 0 on success, %-ENOTSUPP if the controller doesn't support setting the | |
2638 | * debounce time. | |
c4b5be98 | 2639 | */ |
79a9becd | 2640 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2641 | { |
c4b5be98 | 2642 | struct gpio_chip *chip; |
2956b5d9 | 2643 | unsigned long config; |
c4b5be98 | 2644 | |
fdeb8e15 LW |
2645 | VALIDATE_DESC(desc); |
2646 | chip = desc->gdev->chip; | |
2956b5d9 | 2647 | if (!chip->set || !chip->set_config) { |
6424de5a | 2648 | gpiod_dbg(desc, |
2956b5d9 | 2649 | "%s: missing set() or set_config() operations\n", |
6424de5a | 2650 | __func__); |
65d87656 | 2651 | return -ENOTSUPP; |
be1a4b13 LW |
2652 | } |
2653 | ||
2956b5d9 MW |
2654 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
2655 | return chip->set_config(chip, gpio_chip_hwgpio(desc), config); | |
c4b5be98 | 2656 | } |
79a9becd | 2657 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2658 | |
e10f72bf AJ |
2659 | /** |
2660 | * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset | |
2661 | * @desc: descriptor of the GPIO for which to configure persistence | |
2662 | * @transitory: True to lose state on suspend or reset, false for persistence | |
2663 | * | |
2664 | * Returns: | |
2665 | * 0 on success, otherwise a negative error code. | |
2666 | */ | |
2667 | int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) | |
2668 | { | |
2669 | struct gpio_chip *chip; | |
2670 | unsigned long packed; | |
2671 | int gpio; | |
2672 | int rc; | |
2673 | ||
156dd392 | 2674 | VALIDATE_DESC(desc); |
e10f72bf AJ |
2675 | /* |
2676 | * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for | |
2677 | * persistence state. | |
2678 | */ | |
2679 | if (transitory) | |
2680 | set_bit(FLAG_TRANSITORY, &desc->flags); | |
2681 | else | |
2682 | clear_bit(FLAG_TRANSITORY, &desc->flags); | |
2683 | ||
2684 | /* If the driver supports it, set the persistence state now */ | |
2685 | chip = desc->gdev->chip; | |
2686 | if (!chip->set_config) | |
2687 | return 0; | |
2688 | ||
2689 | packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE, | |
2690 | !transitory); | |
2691 | gpio = gpio_chip_hwgpio(desc); | |
2692 | rc = chip->set_config(chip, gpio, packed); | |
2693 | if (rc == -ENOTSUPP) { | |
2694 | dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n", | |
2695 | gpio); | |
2696 | return 0; | |
2697 | } | |
2698 | ||
2699 | return rc; | |
2700 | } | |
2701 | EXPORT_SYMBOL_GPL(gpiod_set_transitory); | |
2702 | ||
79a9becd AC |
2703 | /** |
2704 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2705 | * @desc: the gpio descriptor to test | |
2706 | * | |
2707 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2708 | */ | |
2709 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2710 | { |
fdeb8e15 | 2711 | VALIDATE_DESC(desc); |
79a9becd | 2712 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2713 | } |
79a9becd | 2714 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2715 | |
2716 | /* I/O calls are only valid after configuration completed; the relevant | |
2717 | * "is this a valid GPIO" error checks should already have been done. | |
2718 | * | |
2719 | * "Get" operations are often inlinable as reading a pin value register, | |
2720 | * and masking the relevant bit in that register. | |
2721 | * | |
2722 | * When "set" operations are inlinable, they involve writing that mask to | |
2723 | * one register to set a low value, or a different register to set it high. | |
2724 | * Otherwise locking is needed, so there may be little value to inlining. | |
2725 | * | |
2726 | *------------------------------------------------------------------------ | |
2727 | * | |
2728 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2729 | * have requested the GPIO. That can include implicit requesting by | |
2730 | * a direction setting call. Marking a gpio as requested locks its chip | |
2731 | * in memory, guaranteeing that these table lookups need no more locking | |
2732 | * and that gpiochip_remove() will fail. | |
2733 | * | |
2734 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2735 | * that the GPIO was actually requested. | |
2736 | */ | |
2737 | ||
fac9d885 | 2738 | static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
d2876d08 DB |
2739 | { |
2740 | struct gpio_chip *chip; | |
372e722e | 2741 | int offset; |
e20538b8 | 2742 | int value; |
d2876d08 | 2743 | |
fdeb8e15 | 2744 | chip = desc->gdev->chip; |
372e722e | 2745 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2746 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2747 | value = value < 0 ? value : !!value; |
372e722e | 2748 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2749 | return value; |
d2876d08 | 2750 | } |
372e722e | 2751 | |
eec1d566 LW |
2752 | static int gpio_chip_get_multiple(struct gpio_chip *chip, |
2753 | unsigned long *mask, unsigned long *bits) | |
2754 | { | |
2755 | if (chip->get_multiple) { | |
2756 | return chip->get_multiple(chip, mask, bits); | |
2757 | } else if (chip->get) { | |
2758 | int i, value; | |
2759 | ||
2760 | for_each_set_bit(i, mask, chip->ngpio) { | |
2761 | value = chip->get(chip, i); | |
2762 | if (value < 0) | |
2763 | return value; | |
2764 | __assign_bit(i, bits, value); | |
2765 | } | |
2766 | return 0; | |
2767 | } | |
2768 | return -EIO; | |
2769 | } | |
2770 | ||
2771 | int gpiod_get_array_value_complex(bool raw, bool can_sleep, | |
2772 | unsigned int array_size, | |
2773 | struct gpio_desc **desc_array, | |
2774 | int *value_array) | |
2775 | { | |
2776 | int i = 0; | |
2777 | ||
2778 | while (i < array_size) { | |
2779 | struct gpio_chip *chip = desc_array[i]->gdev->chip; | |
3027743f LA |
2780 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
2781 | unsigned long *mask, *bits; | |
eec1d566 LW |
2782 | int first, j, ret; |
2783 | ||
3027743f LA |
2784 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
2785 | mask = fastpath; | |
2786 | } else { | |
2787 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
2788 | sizeof(*mask), | |
2789 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
2790 | if (!mask) | |
2791 | return -ENOMEM; | |
2792 | } | |
2793 | ||
2794 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
2795 | bitmap_zero(mask, chip->ngpio); | |
2796 | ||
eec1d566 LW |
2797 | if (!can_sleep) |
2798 | WARN_ON(chip->can_sleep); | |
2799 | ||
2800 | /* collect all inputs belonging to the same chip */ | |
2801 | first = i; | |
eec1d566 LW |
2802 | do { |
2803 | const struct gpio_desc *desc = desc_array[i]; | |
2804 | int hwgpio = gpio_chip_hwgpio(desc); | |
2805 | ||
2806 | __set_bit(hwgpio, mask); | |
2807 | i++; | |
2808 | } while ((i < array_size) && | |
2809 | (desc_array[i]->gdev->chip == chip)); | |
2810 | ||
2811 | ret = gpio_chip_get_multiple(chip, mask, bits); | |
3027743f LA |
2812 | if (ret) { |
2813 | if (mask != fastpath) | |
2814 | kfree(mask); | |
eec1d566 | 2815 | return ret; |
3027743f | 2816 | } |
eec1d566 LW |
2817 | |
2818 | for (j = first; j < i; j++) { | |
2819 | const struct gpio_desc *desc = desc_array[j]; | |
2820 | int hwgpio = gpio_chip_hwgpio(desc); | |
2821 | int value = test_bit(hwgpio, bits); | |
2822 | ||
2823 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2824 | value = !value; | |
2825 | value_array[j] = value; | |
2826 | trace_gpio_value(desc_to_gpio(desc), 1, value); | |
2827 | } | |
3027743f LA |
2828 | |
2829 | if (mask != fastpath) | |
2830 | kfree(mask); | |
eec1d566 LW |
2831 | } |
2832 | return 0; | |
2833 | } | |
2834 | ||
d2876d08 | 2835 | /** |
79a9becd AC |
2836 | * gpiod_get_raw_value() - return a gpio's raw value |
2837 | * @desc: gpio whose value will be returned | |
d2876d08 | 2838 | * |
79a9becd | 2839 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2840 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2841 | * |
2842 | * This function should be called from contexts where we cannot sleep, and will | |
2843 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2844 | */ |
79a9becd | 2845 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2846 | { |
fdeb8e15 | 2847 | VALIDATE_DESC(desc); |
e4e449e8 | 2848 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2849 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 2850 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 2851 | } |
79a9becd | 2852 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2853 | |
79a9becd AC |
2854 | /** |
2855 | * gpiod_get_value() - return a gpio's value | |
2856 | * @desc: gpio whose value will be returned | |
2857 | * | |
2858 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2859 | * account, or negative errno on failure. |
79a9becd AC |
2860 | * |
2861 | * This function should be called from contexts where we cannot sleep, and will | |
2862 | * complain if the GPIO chip functions potentially sleep. | |
2863 | */ | |
2864 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2865 | { |
79a9becd | 2866 | int value; |
fdeb8e15 LW |
2867 | |
2868 | VALIDATE_DESC(desc); | |
79a9becd | 2869 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2870 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2871 | |
fac9d885 | 2872 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
2873 | if (value < 0) |
2874 | return value; | |
2875 | ||
79a9becd AC |
2876 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2877 | value = !value; | |
2878 | ||
2879 | return value; | |
372e722e | 2880 | } |
79a9becd | 2881 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2882 | |
eec1d566 LW |
2883 | /** |
2884 | * gpiod_get_raw_array_value() - read raw values from an array of GPIOs | |
2885 | * @array_size: number of elements in the descriptor / value arrays | |
2886 | * @desc_array: array of GPIO descriptors whose values will be read | |
2887 | * @value_array: array to store the read values | |
2888 | * | |
2889 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
2890 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
2891 | * else an error code. | |
2892 | * | |
2893 | * This function should be called from contexts where we cannot sleep, | |
2894 | * and it will complain if the GPIO chip functions potentially sleep. | |
2895 | */ | |
2896 | int gpiod_get_raw_array_value(unsigned int array_size, | |
2897 | struct gpio_desc **desc_array, int *value_array) | |
2898 | { | |
2899 | if (!desc_array) | |
2900 | return -EINVAL; | |
2901 | return gpiod_get_array_value_complex(true, false, array_size, | |
2902 | desc_array, value_array); | |
2903 | } | |
2904 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); | |
2905 | ||
2906 | /** | |
2907 | * gpiod_get_array_value() - read values from an array of GPIOs | |
2908 | * @array_size: number of elements in the descriptor / value arrays | |
2909 | * @desc_array: array of GPIO descriptors whose values will be read | |
2910 | * @value_array: array to store the read values | |
2911 | * | |
2912 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2913 | * into account. Return 0 in case of success, else an error code. | |
2914 | * | |
2915 | * This function should be called from contexts where we cannot sleep, | |
2916 | * and it will complain if the GPIO chip functions potentially sleep. | |
2917 | */ | |
2918 | int gpiod_get_array_value(unsigned int array_size, | |
2919 | struct gpio_desc **desc_array, int *value_array) | |
2920 | { | |
2921 | if (!desc_array) | |
2922 | return -EINVAL; | |
2923 | return gpiod_get_array_value_complex(false, false, array_size, | |
2924 | desc_array, value_array); | |
2925 | } | |
2926 | EXPORT_SYMBOL_GPL(gpiod_get_array_value); | |
2927 | ||
aca5ce14 | 2928 | /* |
fac9d885 | 2929 | * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
79a9becd | 2930 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 2931 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 2932 | */ |
fac9d885 | 2933 | static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
2934 | { |
2935 | int err = 0; | |
fdeb8e15 | 2936 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2937 | int offset = gpio_chip_hwgpio(desc); |
2938 | ||
aca5ce14 | 2939 | if (value) { |
372e722e | 2940 | err = chip->direction_input(chip, offset); |
aca5ce14 | 2941 | if (!err) |
372e722e | 2942 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2943 | } else { |
372e722e | 2944 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 2945 | if (!err) |
372e722e | 2946 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2947 | } |
372e722e | 2948 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 2949 | if (err < 0) |
6424de5a MB |
2950 | gpiod_err(desc, |
2951 | "%s: Error in set_value for open drain err %d\n", | |
2952 | __func__, err); | |
aca5ce14 LD |
2953 | } |
2954 | ||
25553ff0 | 2955 | /* |
79a9becd AC |
2956 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
2957 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 2958 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 2959 | */ |
fac9d885 | 2960 | static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
25553ff0 LD |
2961 | { |
2962 | int err = 0; | |
fdeb8e15 | 2963 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2964 | int offset = gpio_chip_hwgpio(desc); |
2965 | ||
25553ff0 | 2966 | if (value) { |
372e722e | 2967 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 2968 | if (!err) |
372e722e | 2969 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2970 | } else { |
372e722e | 2971 | err = chip->direction_input(chip, offset); |
25553ff0 | 2972 | if (!err) |
372e722e | 2973 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2974 | } |
372e722e | 2975 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 2976 | if (err < 0) |
6424de5a MB |
2977 | gpiod_err(desc, |
2978 | "%s: Error in set_value for open source err %d\n", | |
2979 | __func__, err); | |
25553ff0 LD |
2980 | } |
2981 | ||
fac9d885 | 2982 | static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
d2876d08 DB |
2983 | { |
2984 | struct gpio_chip *chip; | |
2985 | ||
fdeb8e15 | 2986 | chip = desc->gdev->chip; |
372e722e | 2987 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
02e47980 | 2988 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
372e722e AC |
2989 | } |
2990 | ||
5f424243 RI |
2991 | /* |
2992 | * set multiple outputs on the same chip; | |
2993 | * use the chip's set_multiple function if available; | |
2994 | * otherwise set the outputs sequentially; | |
2995 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
2996 | * defines which outputs are to be changed | |
2997 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
2998 | * defines the values the outputs specified by mask are to be set to | |
2999 | */ | |
3000 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
3001 | unsigned long *mask, unsigned long *bits) | |
3002 | { | |
3003 | if (chip->set_multiple) { | |
3004 | chip->set_multiple(chip, mask, bits); | |
3005 | } else { | |
5e4e6fb3 AS |
3006 | unsigned int i; |
3007 | ||
3008 | /* set outputs if the corresponding mask bit is set */ | |
3009 | for_each_set_bit(i, mask, chip->ngpio) | |
3010 | chip->set(chip, i, test_bit(i, bits)); | |
5f424243 RI |
3011 | } |
3012 | } | |
3013 | ||
3027743f | 3014 | int gpiod_set_array_value_complex(bool raw, bool can_sleep, |
44c7288f LW |
3015 | unsigned int array_size, |
3016 | struct gpio_desc **desc_array, | |
3017 | int *value_array) | |
5f424243 RI |
3018 | { |
3019 | int i = 0; | |
3020 | ||
3021 | while (i < array_size) { | |
fdeb8e15 | 3022 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
3027743f LA |
3023 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
3024 | unsigned long *mask, *bits; | |
5f424243 RI |
3025 | int count = 0; |
3026 | ||
3027743f LA |
3027 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
3028 | mask = fastpath; | |
3029 | } else { | |
3030 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
3031 | sizeof(*mask), | |
3032 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
3033 | if (!mask) | |
3034 | return -ENOMEM; | |
3035 | } | |
3036 | ||
3037 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
3038 | bitmap_zero(mask, chip->ngpio); | |
3039 | ||
38e003f4 | 3040 | if (!can_sleep) |
5f424243 | 3041 | WARN_ON(chip->can_sleep); |
38e003f4 | 3042 | |
5f424243 RI |
3043 | do { |
3044 | struct gpio_desc *desc = desc_array[i]; | |
3045 | int hwgpio = gpio_chip_hwgpio(desc); | |
3046 | int value = value_array[i]; | |
3047 | ||
3048 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
3049 | value = !value; | |
3050 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
3051 | /* | |
3052 | * collect all normal outputs belonging to the same chip | |
3053 | * open drain and open source outputs are set individually | |
3054 | */ | |
02e47980 | 3055 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
fac9d885 | 3056 | gpio_set_open_drain_value_commit(desc, value); |
02e47980 | 3057 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
fac9d885 | 3058 | gpio_set_open_source_value_commit(desc, value); |
5f424243 RI |
3059 | } else { |
3060 | __set_bit(hwgpio, mask); | |
38e003f4 | 3061 | if (value) |
5f424243 | 3062 | __set_bit(hwgpio, bits); |
38e003f4 | 3063 | else |
5f424243 | 3064 | __clear_bit(hwgpio, bits); |
5f424243 RI |
3065 | count++; |
3066 | } | |
3067 | i++; | |
fdeb8e15 LW |
3068 | } while ((i < array_size) && |
3069 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 3070 | /* push collected bits to outputs */ |
38e003f4 | 3071 | if (count != 0) |
5f424243 | 3072 | gpio_chip_set_multiple(chip, mask, bits); |
3027743f LA |
3073 | |
3074 | if (mask != fastpath) | |
3075 | kfree(mask); | |
5f424243 | 3076 | } |
3027743f | 3077 | return 0; |
5f424243 RI |
3078 | } |
3079 | ||
d2876d08 | 3080 | /** |
79a9becd AC |
3081 | * gpiod_set_raw_value() - assign a gpio's raw value |
3082 | * @desc: gpio whose value will be assigned | |
d2876d08 | 3083 | * @value: value to assign |
d2876d08 | 3084 | * |
79a9becd AC |
3085 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
3086 | * regard for its ACTIVE_LOW status. | |
3087 | * | |
3088 | * This function should be called from contexts where we cannot sleep, and will | |
3089 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3090 | */ |
79a9becd | 3091 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 3092 | { |
fdeb8e15 | 3093 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 3094 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 3095 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 3096 | gpiod_set_raw_value_commit(desc, value); |
d2876d08 | 3097 | } |
79a9becd | 3098 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 | 3099 | |
1e77fc82 GU |
3100 | /** |
3101 | * gpiod_set_value_nocheck() - set a GPIO line value without checking | |
3102 | * @desc: the descriptor to set the value on | |
3103 | * @value: value to set | |
3104 | * | |
3105 | * This sets the value of a GPIO line backing a descriptor, applying | |
3106 | * different semantic quirks like active low and open drain/source | |
3107 | * handling. | |
3108 | */ | |
3109 | static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value) | |
3110 | { | |
3111 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
3112 | value = !value; | |
3113 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
3114 | gpio_set_open_drain_value_commit(desc, value); | |
3115 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
3116 | gpio_set_open_source_value_commit(desc, value); | |
3117 | else | |
3118 | gpiod_set_raw_value_commit(desc, value); | |
3119 | } | |
3120 | ||
d2876d08 | 3121 | /** |
79a9becd AC |
3122 | * gpiod_set_value() - assign a gpio's value |
3123 | * @desc: gpio whose value will be assigned | |
3124 | * @value: value to assign | |
3125 | * | |
02e47980 LW |
3126 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
3127 | * OPEN_DRAIN and OPEN_SOURCE flags into account. | |
d2876d08 | 3128 | * |
79a9becd AC |
3129 | * This function should be called from contexts where we cannot sleep, and will |
3130 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3131 | */ |
79a9becd | 3132 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 3133 | { |
fdeb8e15 | 3134 | VALIDATE_DESC_VOID(desc); |
fdeb8e15 | 3135 | WARN_ON(desc->gdev->chip->can_sleep); |
1e77fc82 | 3136 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3137 | } |
79a9becd | 3138 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 3139 | |
5f424243 | 3140 | /** |
3fff99bc | 3141 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
3142 | * @array_size: number of elements in the descriptor / value arrays |
3143 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3144 | * @value_array: array of values to assign | |
3145 | * | |
3146 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3147 | * without regard for their ACTIVE_LOW status. | |
3148 | * | |
3149 | * This function should be called from contexts where we cannot sleep, and will | |
3150 | * complain if the GPIO chip functions potentially sleep. | |
3151 | */ | |
3027743f | 3152 | int gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
3153 | struct gpio_desc **desc_array, int *value_array) |
3154 | { | |
3155 | if (!desc_array) | |
3027743f LA |
3156 | return -EINVAL; |
3157 | return gpiod_set_array_value_complex(true, false, array_size, | |
3158 | desc_array, value_array); | |
5f424243 | 3159 | } |
3fff99bc | 3160 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
3161 | |
3162 | /** | |
3fff99bc | 3163 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
3164 | * @array_size: number of elements in the descriptor / value arrays |
3165 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3166 | * @value_array: array of values to assign | |
3167 | * | |
3168 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3169 | * into account. | |
3170 | * | |
3171 | * This function should be called from contexts where we cannot sleep, and will | |
3172 | * complain if the GPIO chip functions potentially sleep. | |
3173 | */ | |
3fff99bc RI |
3174 | void gpiod_set_array_value(unsigned int array_size, |
3175 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
3176 | { |
3177 | if (!desc_array) | |
3178 | return; | |
44c7288f LW |
3179 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
3180 | value_array); | |
5f424243 | 3181 | } |
3fff99bc | 3182 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 3183 | |
d2876d08 | 3184 | /** |
79a9becd AC |
3185 | * gpiod_cansleep() - report whether gpio value access may sleep |
3186 | * @desc: gpio to check | |
d2876d08 | 3187 | * |
d2876d08 | 3188 | */ |
79a9becd | 3189 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 3190 | { |
fdeb8e15 LW |
3191 | VALIDATE_DESC(desc); |
3192 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 3193 | } |
79a9becd | 3194 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 3195 | |
90b39402 LW |
3196 | /** |
3197 | * gpiod_set_consumer_name() - set the consumer name for the descriptor | |
3198 | * @desc: gpio to set the consumer name on | |
3199 | * @name: the new consumer name | |
3200 | */ | |
3201 | void gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) | |
3202 | { | |
3203 | VALIDATE_DESC_VOID(desc); | |
3204 | /* Just overwrite whatever the previous name was */ | |
3205 | desc->label = name; | |
3206 | } | |
3207 | EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); | |
3208 | ||
0f6d504e | 3209 | /** |
79a9becd AC |
3210 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
3211 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 3212 | * |
79a9becd AC |
3213 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
3214 | * error. | |
0f6d504e | 3215 | */ |
79a9becd | 3216 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 3217 | { |
4c37ce86 LW |
3218 | struct gpio_chip *chip; |
3219 | int offset; | |
0f6d504e | 3220 | |
79bb71bd LW |
3221 | /* |
3222 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
3223 | * requires this function to not return zero on an invalid descriptor | |
3224 | * but rather a negative error number. | |
3225 | */ | |
bfbbe44d | 3226 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
3227 | return -EINVAL; |
3228 | ||
fdeb8e15 | 3229 | chip = desc->gdev->chip; |
372e722e | 3230 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
3231 | if (chip->to_irq) { |
3232 | int retirq = chip->to_irq(chip, offset); | |
3233 | ||
3234 | /* Zero means NO_IRQ */ | |
3235 | if (!retirq) | |
3236 | return -ENXIO; | |
3237 | ||
3238 | return retirq; | |
3239 | } | |
3240 | return -ENXIO; | |
0f6d504e | 3241 | } |
79a9becd | 3242 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 3243 | |
d468bf9e | 3244 | /** |
e3a2e878 | 3245 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
3246 | * @chip: the chip the GPIO to lock belongs to |
3247 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3248 | * |
3249 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 3250 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 3251 | */ |
e3a2e878 | 3252 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 3253 | { |
9c10280d LW |
3254 | struct gpio_desc *desc; |
3255 | ||
3256 | desc = gpiochip_get_desc(chip, offset); | |
3257 | if (IS_ERR(desc)) | |
3258 | return PTR_ERR(desc); | |
3259 | ||
60f8339e LW |
3260 | /* |
3261 | * If it's fast: flush the direction setting if something changed | |
3262 | * behind our back | |
3263 | */ | |
3264 | if (!chip->can_sleep && chip->get_direction) { | |
80956790 | 3265 | int dir = gpiod_get_direction(desc); |
9c10280d | 3266 | |
36b31279 AS |
3267 | if (dir < 0) { |
3268 | chip_err(chip, "%s: cannot get GPIO direction\n", | |
3269 | __func__); | |
3270 | return dir; | |
3271 | } | |
9c10280d | 3272 | } |
d468bf9e | 3273 | |
9c10280d | 3274 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 3275 | chip_err(chip, |
b1911710 AS |
3276 | "%s: tried to flag a GPIO set as output for IRQ\n", |
3277 | __func__); | |
d468bf9e LW |
3278 | return -EIO; |
3279 | } | |
3280 | ||
9c10280d | 3281 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
3940c34a LW |
3282 | |
3283 | /* | |
3284 | * If the consumer has not set up a label (such as when the | |
3285 | * IRQ is referenced from .to_irq()) we set up a label here | |
3286 | * so it is clear this is used as an interrupt. | |
3287 | */ | |
3288 | if (!desc->label) | |
3289 | desc_set_label(desc, "interrupt"); | |
3290 | ||
d468bf9e | 3291 | return 0; |
372e722e | 3292 | } |
e3a2e878 | 3293 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 3294 | |
d468bf9e | 3295 | /** |
e3a2e878 | 3296 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
3297 | * @chip: the chip the GPIO to lock belongs to |
3298 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3299 | * |
3300 | * This is used directly by GPIO drivers that want to indicate | |
3301 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 3302 | */ |
e3a2e878 | 3303 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 3304 | { |
3940c34a LW |
3305 | struct gpio_desc *desc; |
3306 | ||
3307 | desc = gpiochip_get_desc(chip, offset); | |
3308 | if (IS_ERR(desc)) | |
d468bf9e | 3309 | return; |
d2876d08 | 3310 | |
3940c34a LW |
3311 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
3312 | ||
3313 | /* If we only had this marking, erase it */ | |
3314 | if (desc->label && !strcmp(desc->label, "interrupt")) | |
3315 | desc_set_label(desc, NULL); | |
d468bf9e | 3316 | } |
e3a2e878 | 3317 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 3318 | |
6cee3821 LW |
3319 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
3320 | { | |
3321 | if (offset >= chip->ngpio) | |
3322 | return false; | |
3323 | ||
3324 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
3325 | } | |
3326 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
3327 | ||
4e6b8238 HV |
3328 | int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset) |
3329 | { | |
3330 | int ret; | |
3331 | ||
3332 | if (!try_module_get(chip->gpiodev->owner)) | |
3333 | return -ENODEV; | |
3334 | ||
3335 | ret = gpiochip_lock_as_irq(chip, offset); | |
3336 | if (ret) { | |
3337 | chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset); | |
3338 | module_put(chip->gpiodev->owner); | |
3339 | return ret; | |
3340 | } | |
3341 | return 0; | |
3342 | } | |
3343 | EXPORT_SYMBOL_GPL(gpiochip_reqres_irq); | |
3344 | ||
3345 | void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset) | |
3346 | { | |
3347 | gpiochip_unlock_as_irq(chip, offset); | |
3348 | module_put(chip->gpiodev->owner); | |
3349 | } | |
3350 | EXPORT_SYMBOL_GPL(gpiochip_relres_irq); | |
3351 | ||
143b65d6 LW |
3352 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
3353 | { | |
3354 | if (offset >= chip->ngpio) | |
3355 | return false; | |
3356 | ||
3357 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
3358 | } | |
3359 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
3360 | ||
3361 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
3362 | { | |
3363 | if (offset >= chip->ngpio) | |
3364 | return false; | |
3365 | ||
3366 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
3367 | } | |
3368 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
3369 | ||
05f479bf CK |
3370 | bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) |
3371 | { | |
3372 | if (offset >= chip->ngpio) | |
3373 | return false; | |
3374 | ||
e10f72bf | 3375 | return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags); |
05f479bf CK |
3376 | } |
3377 | EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); | |
3378 | ||
79a9becd AC |
3379 | /** |
3380 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
3381 | * @desc: gpio whose value will be returned | |
3382 | * | |
3383 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 3384 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
3385 | * |
3386 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 3387 | */ |
79a9becd | 3388 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 3389 | { |
d2876d08 | 3390 | might_sleep_if(extra_checks); |
fdeb8e15 | 3391 | VALIDATE_DESC(desc); |
fac9d885 | 3392 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3393 | } |
79a9becd | 3394 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 3395 | |
79a9becd AC |
3396 | /** |
3397 | * gpiod_get_value_cansleep() - return a gpio's value | |
3398 | * @desc: gpio whose value will be returned | |
3399 | * | |
3400 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3401 | * account, or negative errno on failure. |
79a9becd AC |
3402 | * |
3403 | * This function is to be called from contexts that can sleep. | |
3404 | */ | |
3405 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 3406 | { |
3f397c21 | 3407 | int value; |
d2876d08 DB |
3408 | |
3409 | might_sleep_if(extra_checks); | |
fdeb8e15 | 3410 | VALIDATE_DESC(desc); |
fac9d885 | 3411 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3412 | if (value < 0) |
3413 | return value; | |
3414 | ||
79a9becd AC |
3415 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3416 | value = !value; | |
3417 | ||
3f397c21 | 3418 | return value; |
d2876d08 | 3419 | } |
79a9becd | 3420 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 3421 | |
eec1d566 LW |
3422 | /** |
3423 | * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs | |
3424 | * @array_size: number of elements in the descriptor / value arrays | |
3425 | * @desc_array: array of GPIO descriptors whose values will be read | |
3426 | * @value_array: array to store the read values | |
3427 | * | |
3428 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3429 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3430 | * else an error code. | |
3431 | * | |
3432 | * This function is to be called from contexts that can sleep. | |
3433 | */ | |
3434 | int gpiod_get_raw_array_value_cansleep(unsigned int array_size, | |
3435 | struct gpio_desc **desc_array, | |
3436 | int *value_array) | |
3437 | { | |
3438 | might_sleep_if(extra_checks); | |
3439 | if (!desc_array) | |
3440 | return -EINVAL; | |
3441 | return gpiod_get_array_value_complex(true, true, array_size, | |
3442 | desc_array, value_array); | |
3443 | } | |
3444 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); | |
3445 | ||
3446 | /** | |
3447 | * gpiod_get_array_value_cansleep() - read values from an array of GPIOs | |
3448 | * @array_size: number of elements in the descriptor / value arrays | |
3449 | * @desc_array: array of GPIO descriptors whose values will be read | |
3450 | * @value_array: array to store the read values | |
3451 | * | |
3452 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3453 | * into account. Return 0 in case of success, else an error code. | |
3454 | * | |
3455 | * This function is to be called from contexts that can sleep. | |
3456 | */ | |
3457 | int gpiod_get_array_value_cansleep(unsigned int array_size, | |
3458 | struct gpio_desc **desc_array, | |
3459 | int *value_array) | |
3460 | { | |
3461 | might_sleep_if(extra_checks); | |
3462 | if (!desc_array) | |
3463 | return -EINVAL; | |
3464 | return gpiod_get_array_value_complex(false, true, array_size, | |
3465 | desc_array, value_array); | |
3466 | } | |
3467 | EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep); | |
3468 | ||
79a9becd AC |
3469 | /** |
3470 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
3471 | * @desc: gpio whose value will be assigned | |
3472 | * @value: value to assign | |
3473 | * | |
3474 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
3475 | * regard for its ACTIVE_LOW status. | |
3476 | * | |
3477 | * This function is to be called from contexts that can sleep. | |
3478 | */ | |
3479 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 3480 | { |
d2876d08 | 3481 | might_sleep_if(extra_checks); |
fdeb8e15 | 3482 | VALIDATE_DESC_VOID(desc); |
fac9d885 | 3483 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 3484 | } |
79a9becd | 3485 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 3486 | |
79a9becd AC |
3487 | /** |
3488 | * gpiod_set_value_cansleep() - assign a gpio's value | |
3489 | * @desc: gpio whose value will be assigned | |
3490 | * @value: value to assign | |
3491 | * | |
3492 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
3493 | * account | |
3494 | * | |
3495 | * This function is to be called from contexts that can sleep. | |
3496 | */ | |
3497 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 3498 | { |
d2876d08 | 3499 | might_sleep_if(extra_checks); |
fdeb8e15 | 3500 | VALIDATE_DESC_VOID(desc); |
1e77fc82 | 3501 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3502 | } |
79a9becd | 3503 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 3504 | |
5f424243 | 3505 | /** |
3fff99bc | 3506 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
3507 | * @array_size: number of elements in the descriptor / value arrays |
3508 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3509 | * @value_array: array of values to assign | |
3510 | * | |
3511 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3512 | * without regard for their ACTIVE_LOW status. | |
3513 | * | |
3514 | * This function is to be called from contexts that can sleep. | |
3515 | */ | |
3027743f | 3516 | int gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
3fff99bc RI |
3517 | struct gpio_desc **desc_array, |
3518 | int *value_array) | |
5f424243 RI |
3519 | { |
3520 | might_sleep_if(extra_checks); | |
3521 | if (!desc_array) | |
3027743f LA |
3522 | return -EINVAL; |
3523 | return gpiod_set_array_value_complex(true, true, array_size, desc_array, | |
44c7288f | 3524 | value_array); |
5f424243 | 3525 | } |
3fff99bc | 3526 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 | 3527 | |
3946d187 DT |
3528 | /** |
3529 | * gpiod_add_lookup_tables() - register GPIO device consumers | |
3530 | * @tables: list of tables of consumers to register | |
3531 | * @n: number of tables in the list | |
3532 | */ | |
3533 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) | |
3534 | { | |
3535 | unsigned int i; | |
3536 | ||
3537 | mutex_lock(&gpio_lookup_lock); | |
3538 | ||
3539 | for (i = 0; i < n; i++) | |
3540 | list_add_tail(&tables[i]->list, &gpio_lookup_list); | |
3541 | ||
3542 | mutex_unlock(&gpio_lookup_lock); | |
3543 | } | |
3544 | ||
5f424243 | 3545 | /** |
3fff99bc | 3546 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
3547 | * @array_size: number of elements in the descriptor / value arrays |
3548 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3549 | * @value_array: array of values to assign | |
3550 | * | |
3551 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3552 | * into account. | |
3553 | * | |
3554 | * This function is to be called from contexts that can sleep. | |
3555 | */ | |
3fff99bc RI |
3556 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
3557 | struct gpio_desc **desc_array, | |
3558 | int *value_array) | |
5f424243 RI |
3559 | { |
3560 | might_sleep_if(extra_checks); | |
3561 | if (!desc_array) | |
3562 | return; | |
44c7288f LW |
3563 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
3564 | value_array); | |
5f424243 | 3565 | } |
3fff99bc | 3566 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 3567 | |
bae48da2 | 3568 | /** |
ad824783 AC |
3569 | * gpiod_add_lookup_table() - register GPIO device consumers |
3570 | * @table: table of consumers to register | |
bae48da2 | 3571 | */ |
ad824783 | 3572 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
3573 | { |
3574 | mutex_lock(&gpio_lookup_lock); | |
3575 | ||
ad824783 | 3576 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
3577 | |
3578 | mutex_unlock(&gpio_lookup_lock); | |
3579 | } | |
226b2242 | 3580 | EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
bae48da2 | 3581 | |
be9015ab SK |
3582 | /** |
3583 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
3584 | * @table: table of consumers to unregister | |
3585 | */ | |
3586 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
3587 | { | |
3588 | mutex_lock(&gpio_lookup_lock); | |
3589 | ||
3590 | list_del(&table->list); | |
3591 | ||
3592 | mutex_unlock(&gpio_lookup_lock); | |
3593 | } | |
226b2242 | 3594 | EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
be9015ab | 3595 | |
a411e81e BG |
3596 | /** |
3597 | * gpiod_add_hogs() - register a set of GPIO hogs from machine code | |
3598 | * @hogs: table of gpio hog entries with a zeroed sentinel at the end | |
3599 | */ | |
3600 | void gpiod_add_hogs(struct gpiod_hog *hogs) | |
3601 | { | |
3602 | struct gpio_chip *chip; | |
3603 | struct gpiod_hog *hog; | |
3604 | ||
3605 | mutex_lock(&gpio_machine_hogs_mutex); | |
3606 | ||
3607 | for (hog = &hogs[0]; hog->chip_label; hog++) { | |
3608 | list_add_tail(&hog->list, &gpio_machine_hogs); | |
3609 | ||
3610 | /* | |
3611 | * The chip may have been registered earlier, so check if it | |
3612 | * exists and, if so, try to hog the line now. | |
3613 | */ | |
3614 | chip = find_chip_by_name(hog->chip_label); | |
3615 | if (chip) | |
3616 | gpiochip_machine_hog(chip, hog); | |
3617 | } | |
3618 | ||
3619 | mutex_unlock(&gpio_machine_hogs_mutex); | |
3620 | } | |
3621 | EXPORT_SYMBOL_GPL(gpiod_add_hogs); | |
3622 | ||
ad824783 | 3623 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
3624 | { |
3625 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 3626 | struct gpiod_lookup_table *table; |
bae48da2 AC |
3627 | |
3628 | mutex_lock(&gpio_lookup_lock); | |
3629 | ||
ad824783 AC |
3630 | list_for_each_entry(table, &gpio_lookup_list, list) { |
3631 | if (table->dev_id && dev_id) { | |
3632 | /* | |
3633 | * Valid strings on both ends, must be identical to have | |
3634 | * a match | |
3635 | */ | |
3636 | if (!strcmp(table->dev_id, dev_id)) | |
3637 | goto found; | |
3638 | } else { | |
3639 | /* | |
3640 | * One of the pointers is NULL, so both must be to have | |
3641 | * a match | |
3642 | */ | |
3643 | if (dev_id == table->dev_id) | |
3644 | goto found; | |
3645 | } | |
3646 | } | |
3647 | table = NULL; | |
bae48da2 | 3648 | |
ad824783 AC |
3649 | found: |
3650 | mutex_unlock(&gpio_lookup_lock); | |
3651 | return table; | |
3652 | } | |
bae48da2 | 3653 | |
ad824783 AC |
3654 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
3655 | unsigned int idx, | |
3656 | enum gpio_lookup_flags *flags) | |
3657 | { | |
2a3cf6a3 | 3658 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
3659 | struct gpiod_lookup_table *table; |
3660 | struct gpiod_lookup *p; | |
bae48da2 | 3661 | |
ad824783 AC |
3662 | table = gpiod_find_lookup_table(dev); |
3663 | if (!table) | |
3664 | return desc; | |
bae48da2 | 3665 | |
ad824783 AC |
3666 | for (p = &table->table[0]; p->chip_label; p++) { |
3667 | struct gpio_chip *chip; | |
bae48da2 | 3668 | |
ad824783 | 3669 | /* idx must always match exactly */ |
bae48da2 AC |
3670 | if (p->idx != idx) |
3671 | continue; | |
3672 | ||
ad824783 AC |
3673 | /* If the lookup entry has a con_id, require exact match */ |
3674 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
3675 | continue; | |
bae48da2 | 3676 | |
ad824783 | 3677 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 3678 | |
ad824783 | 3679 | if (!chip) { |
8853daf3 JK |
3680 | /* |
3681 | * As the lookup table indicates a chip with | |
3682 | * p->chip_label should exist, assume it may | |
3683 | * still appear later and let the interested | |
3684 | * consumer be probed again or let the Deferred | |
3685 | * Probe infrastructure handle the error. | |
3686 | */ | |
3687 | dev_warn(dev, "cannot find GPIO chip %s, deferring\n", | |
3688 | p->chip_label); | |
3689 | return ERR_PTR(-EPROBE_DEFER); | |
ad824783 | 3690 | } |
bae48da2 | 3691 | |
ad824783 | 3692 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
3693 | dev_err(dev, |
3694 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
3695 | idx, chip->ngpio, chip->label); | |
3696 | return ERR_PTR(-EINVAL); | |
bae48da2 | 3697 | } |
bae48da2 | 3698 | |
bb1e88cc | 3699 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 3700 | *flags = p->flags; |
bae48da2 | 3701 | |
2a3cf6a3 | 3702 | return desc; |
bae48da2 AC |
3703 | } |
3704 | ||
bae48da2 AC |
3705 | return desc; |
3706 | } | |
3707 | ||
66858527 RI |
3708 | static int dt_gpio_count(struct device *dev, const char *con_id) |
3709 | { | |
3710 | int ret; | |
3711 | char propname[32]; | |
3712 | unsigned int i; | |
3713 | ||
3714 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
3715 | if (con_id) | |
3716 | snprintf(propname, sizeof(propname), "%s-%s", | |
3717 | con_id, gpio_suffixes[i]); | |
3718 | else | |
3719 | snprintf(propname, sizeof(propname), "%s", | |
3720 | gpio_suffixes[i]); | |
3721 | ||
3722 | ret = of_gpio_named_count(dev->of_node, propname); | |
4033d4a4 | 3723 | if (ret > 0) |
66858527 RI |
3724 | break; |
3725 | } | |
4033d4a4 | 3726 | return ret ? ret : -ENOENT; |
66858527 RI |
3727 | } |
3728 | ||
3729 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3730 | { | |
3731 | struct gpiod_lookup_table *table; | |
3732 | struct gpiod_lookup *p; | |
3733 | unsigned int count = 0; | |
3734 | ||
3735 | table = gpiod_find_lookup_table(dev); | |
3736 | if (!table) | |
3737 | return -ENOENT; | |
3738 | ||
3739 | for (p = &table->table[0]; p->chip_label; p++) { | |
3740 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3741 | (!con_id && !p->con_id)) | |
3742 | count++; | |
3743 | } | |
3744 | if (!count) | |
3745 | return -ENOENT; | |
3746 | ||
3747 | return count; | |
3748 | } | |
3749 | ||
3750 | /** | |
3751 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3752 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3753 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3754 | * @con_id: function within the GPIO consumer | |
3755 | */ | |
3756 | int gpiod_count(struct device *dev, const char *con_id) | |
3757 | { | |
3758 | int count = -ENOENT; | |
3759 | ||
3760 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3761 | count = dt_gpio_count(dev, con_id); | |
3762 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3763 | count = acpi_gpio_count(dev, con_id); | |
3764 | ||
3765 | if (count < 0) | |
3766 | count = platform_gpio_count(dev, con_id); | |
3767 | ||
3768 | return count; | |
3769 | } | |
3770 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3771 | ||
bae48da2 | 3772 | /** |
0879162f | 3773 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3774 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3775 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3776 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3777 | * |
3778 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3779 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3780 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3781 | */ |
b17d1bf1 | 3782 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3783 | enum gpiod_flags flags) |
bae48da2 | 3784 | { |
39b2bbe3 | 3785 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3786 | } |
b17d1bf1 | 3787 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3788 | |
29a1f233 TR |
3789 | /** |
3790 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3791 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3792 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3793 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3794 | * |
3795 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3796 | * the requested function it will return NULL. This is convenient for drivers | |
3797 | * that need to handle optional GPIOs. | |
3798 | */ | |
b17d1bf1 | 3799 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3800 | const char *con_id, |
3801 | enum gpiod_flags flags) | |
29a1f233 | 3802 | { |
39b2bbe3 | 3803 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3804 | } |
b17d1bf1 | 3805 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3806 | |
f625d460 BP |
3807 | |
3808 | /** | |
3809 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3810 | * @desc: gpio whose value will be assigned | |
3811 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3812 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3813 | * of_get_gpio_hog() | |
f625d460 BP |
3814 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3815 | * | |
3816 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3817 | * requested function and/or index, or another IS_ERR() code if an error | |
3818 | * occurred while trying to acquire the GPIO. | |
3819 | */ | |
c29fd9eb | 3820 | int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
85b03b30 | 3821 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3822 | { |
3823 | int status; | |
3824 | ||
85b03b30 JH |
3825 | if (lflags & GPIO_ACTIVE_LOW) |
3826 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
f926dfc1 | 3827 | |
85b03b30 JH |
3828 | if (lflags & GPIO_OPEN_DRAIN) |
3829 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
f926dfc1 LW |
3830 | else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) { |
3831 | /* | |
3832 | * This enforces open drain mode from the consumer side. | |
3833 | * This is necessary for some busses like I2C, but the lookup | |
3834 | * should *REALLY* have specified them as open drain in the | |
3835 | * first place, so print a little warning here. | |
3836 | */ | |
3837 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3838 | gpiod_warn(desc, | |
3839 | "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n"); | |
3840 | } | |
3841 | ||
85b03b30 JH |
3842 | if (lflags & GPIO_OPEN_SOURCE) |
3843 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
e10f72bf AJ |
3844 | |
3845 | status = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY)); | |
3846 | if (status < 0) | |
3847 | return status; | |
85b03b30 | 3848 | |
f625d460 BP |
3849 | /* No particular flag request, return here... */ |
3850 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
3851 | pr_debug("no flags found for %s\n", con_id); | |
3852 | return 0; | |
3853 | } | |
3854 | ||
3855 | /* Process flags */ | |
3856 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
3857 | status = gpiod_direction_output(desc, | |
ad17731d | 3858 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
f625d460 BP |
3859 | else |
3860 | status = gpiod_direction_input(desc); | |
3861 | ||
3862 | return status; | |
3863 | } | |
3864 | ||
bae48da2 AC |
3865 | /** |
3866 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 3867 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
3868 | * @con_id: function within the GPIO consumer |
3869 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3870 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3871 | * |
3872 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
3873 | * defined one for functions that define several GPIOs. | |
3874 | * | |
2a3cf6a3 AC |
3875 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
3876 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 3877 | * occurred while trying to acquire the GPIO. |
bae48da2 | 3878 | */ |
b17d1bf1 | 3879 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 3880 | const char *con_id, |
39b2bbe3 AC |
3881 | unsigned int idx, |
3882 | enum gpiod_flags flags) | |
bae48da2 | 3883 | { |
35c5d7fd | 3884 | struct gpio_desc *desc = NULL; |
bae48da2 | 3885 | int status; |
39b2bbe3 | 3886 | enum gpio_lookup_flags lookupflags = 0; |
7d18f0a1 LW |
3887 | /* Maybe we have a device name, maybe not */ |
3888 | const char *devname = dev ? dev_name(dev) : "?"; | |
bae48da2 AC |
3889 | |
3890 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
3891 | ||
4d8440b9 RW |
3892 | if (dev) { |
3893 | /* Using device tree? */ | |
3894 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
3895 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
3896 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
3897 | } else if (ACPI_COMPANION(dev)) { | |
3898 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
a31f5c3a | 3899 | desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
4d8440b9 | 3900 | } |
35c5d7fd AC |
3901 | } |
3902 | ||
3903 | /* | |
3904 | * Either we are not using DT or ACPI, or their lookup did not return | |
3905 | * a result. In that case, use platform lookup as a fallback. | |
3906 | */ | |
2a3cf6a3 | 3907 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 3908 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 3909 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
3910 | } |
3911 | ||
3912 | if (IS_ERR(desc)) { | |
9d5a1f2c | 3913 | dev_dbg(dev, "No GPIO consumer %s found\n", con_id); |
bae48da2 AC |
3914 | return desc; |
3915 | } | |
3916 | ||
7d18f0a1 LW |
3917 | /* |
3918 | * If a connection label was passed use that, else attempt to use | |
3919 | * the device name as label | |
3920 | */ | |
3921 | status = gpiod_request(desc, con_id ? con_id : devname); | |
bae48da2 AC |
3922 | if (status < 0) |
3923 | return ERR_PTR(status); | |
3924 | ||
85b03b30 | 3925 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
3926 | if (status < 0) { |
3927 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
3928 | gpiod_put(desc); | |
3929 | return ERR_PTR(status); | |
3930 | } | |
3931 | ||
bae48da2 AC |
3932 | return desc; |
3933 | } | |
b17d1bf1 | 3934 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 3935 | |
6392cca4 LW |
3936 | /** |
3937 | * gpiod_get_from_of_node() - obtain a GPIO from an OF node | |
3938 | * @node: handle of the OF node | |
3939 | * @propname: name of the DT property representing the GPIO | |
3940 | * @index: index of the GPIO to obtain for the consumer | |
3941 | * @dflags: GPIO initialization flags | |
3942 | * @label: label to attach to the requested GPIO | |
3943 | * | |
3944 | * Returns: | |
3945 | * On successful request the GPIO pin is configured in accordance with | |
3946 | * provided @dflags. If the node does not have the requested GPIO | |
3947 | * property, NULL is returned. | |
3948 | * | |
3949 | * In case of error an ERR_PTR() is returned. | |
3950 | */ | |
92542edc LW |
3951 | struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, |
3952 | const char *propname, int index, | |
3953 | enum gpiod_flags dflags, | |
3954 | const char *label) | |
6392cca4 | 3955 | { |
40a3c9db | 3956 | struct gpio_desc *desc; |
6392cca4 LW |
3957 | unsigned long lflags = 0; |
3958 | enum of_gpio_flags flags; | |
3959 | bool active_low = false; | |
3960 | bool single_ended = false; | |
3961 | bool open_drain = false; | |
3962 | bool transitory = false; | |
3963 | int ret; | |
3964 | ||
3965 | desc = of_get_named_gpiod_flags(node, propname, | |
3966 | index, &flags); | |
3967 | ||
3968 | if (!desc || IS_ERR(desc)) { | |
3969 | /* If it is not there, just return NULL */ | |
3970 | if (PTR_ERR(desc) == -ENOENT) | |
3971 | return NULL; | |
3972 | return desc; | |
3973 | } | |
3974 | ||
3975 | active_low = flags & OF_GPIO_ACTIVE_LOW; | |
3976 | single_ended = flags & OF_GPIO_SINGLE_ENDED; | |
3977 | open_drain = flags & OF_GPIO_OPEN_DRAIN; | |
3978 | transitory = flags & OF_GPIO_TRANSITORY; | |
3979 | ||
3980 | ret = gpiod_request(desc, label); | |
3981 | if (ret) | |
3982 | return ERR_PTR(ret); | |
3983 | ||
3984 | if (active_low) | |
3985 | lflags |= GPIO_ACTIVE_LOW; | |
3986 | ||
3987 | if (single_ended) { | |
3988 | if (open_drain) | |
3989 | lflags |= GPIO_OPEN_DRAIN; | |
3990 | else | |
3991 | lflags |= GPIO_OPEN_SOURCE; | |
3992 | } | |
3993 | ||
3994 | if (transitory) | |
3995 | lflags |= GPIO_TRANSITORY; | |
3996 | ||
3997 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); | |
3998 | if (ret < 0) { | |
3999 | gpiod_put(desc); | |
4000 | return ERR_PTR(ret); | |
4001 | } | |
4002 | ||
4003 | return desc; | |
4004 | } | |
92542edc | 4005 | EXPORT_SYMBOL(gpiod_get_from_of_node); |
6392cca4 | 4006 | |
40b73183 MW |
4007 | /** |
4008 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
4009 | * @fwnode: handle of the firmware node | |
4010 | * @propname: name of the firmware property representing the GPIO | |
6392cca4 | 4011 | * @index: index of the GPIO to obtain for the consumer |
a264d10f | 4012 | * @dflags: GPIO initialization flags |
950d55f5 | 4013 | * @label: label to attach to the requested GPIO |
40b73183 MW |
4014 | * |
4015 | * This function can be used for drivers that get their configuration | |
6392cca4 | 4016 | * from opaque firmware. |
40b73183 | 4017 | * |
6392cca4 | 4018 | * The function properly finds the corresponding GPIO using whatever is the |
40b73183 MW |
4019 | * underlying firmware interface and then makes sure that the GPIO |
4020 | * descriptor is requested before it is returned to the caller. | |
4021 | * | |
950d55f5 | 4022 | * Returns: |
ff21378a | 4023 | * On successful request the GPIO pin is configured in accordance with |
a264d10f AS |
4024 | * provided @dflags. |
4025 | * | |
40b73183 MW |
4026 | * In case of error an ERR_PTR() is returned. |
4027 | */ | |
4028 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
537b94da | 4029 | const char *propname, int index, |
b2987d74 AS |
4030 | enum gpiod_flags dflags, |
4031 | const char *label) | |
40b73183 MW |
4032 | { |
4033 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
a264d10f | 4034 | unsigned long lflags = 0; |
40b73183 MW |
4035 | int ret; |
4036 | ||
4037 | if (!fwnode) | |
4038 | return ERR_PTR(-EINVAL); | |
4039 | ||
4040 | if (is_of_node(fwnode)) { | |
6392cca4 LW |
4041 | desc = gpiod_get_from_of_node(to_of_node(fwnode), |
4042 | propname, index, | |
4043 | dflags, | |
4044 | label); | |
4045 | return desc; | |
40b73183 MW |
4046 | } else if (is_acpi_node(fwnode)) { |
4047 | struct acpi_gpio_info info; | |
4048 | ||
537b94da | 4049 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
6392cca4 LW |
4050 | if (IS_ERR(desc)) |
4051 | return desc; | |
40b73183 | 4052 | |
6392cca4 | 4053 | acpi_gpio_update_gpiod_flags(&dflags, &info); |
40b73183 | 4054 | |
6392cca4 LW |
4055 | if (info.polarity == GPIO_ACTIVE_LOW) |
4056 | lflags |= GPIO_ACTIVE_LOW; | |
4057 | } | |
40b73183 | 4058 | |
6392cca4 | 4059 | /* Currently only ACPI takes this path */ |
b2987d74 | 4060 | ret = gpiod_request(desc, label); |
85b03b30 JH |
4061 | if (ret) |
4062 | return ERR_PTR(ret); | |
4063 | ||
a264d10f AS |
4064 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
4065 | if (ret < 0) { | |
4066 | gpiod_put(desc); | |
4067 | return ERR_PTR(ret); | |
90b665f6 LP |
4068 | } |
4069 | ||
40b73183 MW |
4070 | return desc; |
4071 | } | |
4072 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
4073 | ||
29a1f233 TR |
4074 | /** |
4075 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
4076 | * function | |
4077 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4078 | * @con_id: function within the GPIO consumer | |
4079 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4080 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
4081 | * |
4082 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
4083 | * specified index was assigned to the requested function it will return NULL. | |
4084 | * This is convenient for drivers that need to handle optional GPIOs. | |
4085 | */ | |
b17d1bf1 | 4086 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 4087 | const char *con_id, |
39b2bbe3 AC |
4088 | unsigned int index, |
4089 | enum gpiod_flags flags) | |
29a1f233 TR |
4090 | { |
4091 | struct gpio_desc *desc; | |
4092 | ||
39b2bbe3 | 4093 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
4094 | if (IS_ERR(desc)) { |
4095 | if (PTR_ERR(desc) == -ENOENT) | |
4096 | return NULL; | |
4097 | } | |
4098 | ||
4099 | return desc; | |
4100 | } | |
b17d1bf1 | 4101 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 4102 | |
f625d460 BP |
4103 | /** |
4104 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
4105 | * @desc: gpio whose value will be assigned | |
4106 | * @name: gpio line name | |
4107 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
4108 | * of_get_gpio_hog() | |
4109 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
4110 | */ | |
4111 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
4112 | unsigned long lflags, enum gpiod_flags dflags) | |
4113 | { | |
4114 | struct gpio_chip *chip; | |
4115 | struct gpio_desc *local_desc; | |
4116 | int hwnum; | |
4117 | int status; | |
4118 | ||
4119 | chip = gpiod_to_chip(desc); | |
4120 | hwnum = gpio_chip_hwgpio(desc); | |
4121 | ||
4122 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
4123 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
4124 | status = PTR_ERR(local_desc); |
4125 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
4126 | name, chip->label, hwnum, status); | |
4127 | return status; | |
f625d460 BP |
4128 | } |
4129 | ||
85b03b30 | 4130 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 4131 | if (status < 0) { |
c31a571d LD |
4132 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
4133 | name, chip->label, hwnum, status); | |
f625d460 BP |
4134 | gpiochip_free_own_desc(desc); |
4135 | return status; | |
4136 | } | |
4137 | ||
4138 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
4139 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
4140 | ||
4141 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
4142 | desc_to_gpio(desc), name, | |
4143 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
4144 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
4145 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
4146 | ||
4147 | return 0; | |
4148 | } | |
4149 | ||
4150 | /** | |
4151 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
4152 | * @chip: gpio chip to act on | |
4153 | * | |
4154 | * This is only used by of_gpiochip_remove to free hogged gpios | |
4155 | */ | |
4156 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
4157 | { | |
4158 | int id; | |
4159 | ||
4160 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
4161 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
4162 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
4163 | } |
4164 | } | |
4165 | ||
66858527 RI |
4166 | /** |
4167 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
4168 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4169 | * @con_id: function within the GPIO consumer | |
4170 | * @flags: optional GPIO initialization flags | |
4171 | * | |
4172 | * This function acquires all the GPIOs defined under a given function. | |
4173 | * | |
4174 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
4175 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
4176 | * code if an error occurred while trying to acquire the GPIOs. | |
4177 | */ | |
4178 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
4179 | const char *con_id, | |
4180 | enum gpiod_flags flags) | |
4181 | { | |
4182 | struct gpio_desc *desc; | |
4183 | struct gpio_descs *descs; | |
4184 | int count; | |
4185 | ||
4186 | count = gpiod_count(dev, con_id); | |
4187 | if (count < 0) | |
4188 | return ERR_PTR(count); | |
4189 | ||
acafe7e3 | 4190 | descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL); |
66858527 RI |
4191 | if (!descs) |
4192 | return ERR_PTR(-ENOMEM); | |
4193 | ||
4194 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
4195 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
4196 | if (IS_ERR(desc)) { | |
4197 | gpiod_put_array(descs); | |
4198 | return ERR_CAST(desc); | |
4199 | } | |
4200 | descs->desc[descs->ndescs] = desc; | |
4201 | descs->ndescs++; | |
4202 | } | |
4203 | return descs; | |
4204 | } | |
4205 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
4206 | ||
4207 | /** | |
4208 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
4209 | * function | |
4210 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4211 | * @con_id: function within the GPIO consumer | |
4212 | * @flags: optional GPIO initialization flags | |
4213 | * | |
4214 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
4215 | * assigned to the requested function it will return NULL. | |
4216 | */ | |
4217 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
4218 | const char *con_id, | |
4219 | enum gpiod_flags flags) | |
4220 | { | |
4221 | struct gpio_descs *descs; | |
4222 | ||
4223 | descs = gpiod_get_array(dev, con_id, flags); | |
4224 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
4225 | return NULL; | |
4226 | ||
4227 | return descs; | |
4228 | } | |
4229 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
4230 | ||
bae48da2 AC |
4231 | /** |
4232 | * gpiod_put - dispose of a GPIO descriptor | |
4233 | * @desc: GPIO descriptor to dispose of | |
4234 | * | |
4235 | * No descriptor can be used after gpiod_put() has been called on it. | |
4236 | */ | |
4237 | void gpiod_put(struct gpio_desc *desc) | |
4238 | { | |
4239 | gpiod_free(desc); | |
372e722e | 4240 | } |
bae48da2 | 4241 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 4242 | |
66858527 RI |
4243 | /** |
4244 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
4245 | * @descs: struct gpio_descs containing an array of descriptors | |
4246 | */ | |
4247 | void gpiod_put_array(struct gpio_descs *descs) | |
4248 | { | |
4249 | unsigned int i; | |
4250 | ||
4251 | for (i = 0; i < descs->ndescs; i++) | |
4252 | gpiod_put(descs->desc[i]); | |
4253 | ||
4254 | kfree(descs); | |
4255 | } | |
4256 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
4257 | ||
3c702e99 LW |
4258 | static int __init gpiolib_dev_init(void) |
4259 | { | |
4260 | int ret; | |
4261 | ||
4262 | /* Register GPIO sysfs bus */ | |
b1911710 | 4263 | ret = bus_register(&gpio_bus_type); |
3c702e99 LW |
4264 | if (ret < 0) { |
4265 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
4266 | return ret; | |
4267 | } | |
4268 | ||
4269 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
4270 | if (ret < 0) { | |
4271 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
4272 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
4273 | } else { |
4274 | gpiolib_initialized = true; | |
4275 | gpiochip_setup_devs(); | |
3c702e99 LW |
4276 | } |
4277 | return ret; | |
4278 | } | |
4279 | core_initcall(gpiolib_dev_init); | |
4280 | ||
d2876d08 DB |
4281 | #ifdef CONFIG_DEBUG_FS |
4282 | ||
fdeb8e15 | 4283 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
4284 | { |
4285 | unsigned i; | |
fdeb8e15 LW |
4286 | struct gpio_chip *chip = gdev->chip; |
4287 | unsigned gpio = gdev->base; | |
4288 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 4289 | int is_out; |
d468bf9e | 4290 | int is_irq; |
d2876d08 | 4291 | |
fdeb8e15 | 4292 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
4293 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
4294 | if (gdesc->name) { | |
4295 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
4296 | gpio, gdesc->name); | |
4297 | } | |
d2876d08 | 4298 | continue; |
ced433e2 | 4299 | } |
d2876d08 | 4300 | |
372e722e | 4301 | gpiod_get_direction(gdesc); |
d2876d08 | 4302 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 4303 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
4304 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
4305 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 | 4306 | is_out ? "out" : "in ", |
1c22a252 | 4307 | chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ", |
d468bf9e | 4308 | is_irq ? "IRQ" : " "); |
d2876d08 DB |
4309 | seq_printf(s, "\n"); |
4310 | } | |
4311 | } | |
4312 | ||
f9c4a31f | 4313 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 4314 | { |
362432ae | 4315 | unsigned long flags; |
ff2b1359 | 4316 | struct gpio_device *gdev = NULL; |
cb1650d4 | 4317 | loff_t index = *pos; |
d2876d08 | 4318 | |
f9c4a31f | 4319 | s->private = ""; |
d2876d08 | 4320 | |
362432ae | 4321 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4322 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
4323 | if (index-- == 0) { |
4324 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 4325 | return gdev; |
f9c4a31f | 4326 | } |
362432ae | 4327 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 4328 | |
cb1650d4 | 4329 | return NULL; |
f9c4a31f TR |
4330 | } |
4331 | ||
4332 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
4333 | { | |
362432ae | 4334 | unsigned long flags; |
ff2b1359 | 4335 | struct gpio_device *gdev = v; |
f9c4a31f TR |
4336 | void *ret = NULL; |
4337 | ||
362432ae | 4338 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4339 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
4340 | ret = NULL; |
4341 | else | |
ff2b1359 | 4342 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 4343 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
4344 | |
4345 | s->private = "\n"; | |
4346 | ++*pos; | |
4347 | ||
4348 | return ret; | |
4349 | } | |
4350 | ||
4351 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
4352 | { | |
4353 | } | |
4354 | ||
4355 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
4356 | { | |
ff2b1359 LW |
4357 | struct gpio_device *gdev = v; |
4358 | struct gpio_chip *chip = gdev->chip; | |
4359 | struct device *parent; | |
4360 | ||
4361 | if (!chip) { | |
4362 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
4363 | dev_name(&gdev->dev)); | |
4364 | return 0; | |
4365 | } | |
f9c4a31f | 4366 | |
ff2b1359 LW |
4367 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
4368 | dev_name(&gdev->dev), | |
fdeb8e15 | 4369 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
4370 | parent = chip->parent; |
4371 | if (parent) | |
4372 | seq_printf(s, ", parent: %s/%s", | |
4373 | parent->bus ? parent->bus->name : "no-bus", | |
4374 | dev_name(parent)); | |
f9c4a31f TR |
4375 | if (chip->label) |
4376 | seq_printf(s, ", %s", chip->label); | |
4377 | if (chip->can_sleep) | |
4378 | seq_printf(s, ", can sleep"); | |
4379 | seq_printf(s, ":\n"); | |
4380 | ||
4381 | if (chip->dbg_show) | |
4382 | chip->dbg_show(s, chip); | |
4383 | else | |
fdeb8e15 | 4384 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 4385 | |
d2876d08 DB |
4386 | return 0; |
4387 | } | |
4388 | ||
f9c4a31f TR |
4389 | static const struct seq_operations gpiolib_seq_ops = { |
4390 | .start = gpiolib_seq_start, | |
4391 | .next = gpiolib_seq_next, | |
4392 | .stop = gpiolib_seq_stop, | |
4393 | .show = gpiolib_seq_show, | |
4394 | }; | |
4395 | ||
d2876d08 DB |
4396 | static int gpiolib_open(struct inode *inode, struct file *file) |
4397 | { | |
f9c4a31f | 4398 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
4399 | } |
4400 | ||
828c0950 | 4401 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 4402 | .owner = THIS_MODULE, |
d2876d08 DB |
4403 | .open = gpiolib_open, |
4404 | .read = seq_read, | |
4405 | .llseek = seq_lseek, | |
f9c4a31f | 4406 | .release = seq_release, |
d2876d08 DB |
4407 | }; |
4408 | ||
4409 | static int __init gpiolib_debugfs_init(void) | |
4410 | { | |
4411 | /* /sys/kernel/debug/gpio */ | |
4412 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
4413 | NULL, NULL, &gpiolib_operations); | |
4414 | return 0; | |
4415 | } | |
4416 | subsys_initcall(gpiolib_debugfs_init); | |
4417 | ||
4418 | #endif /* DEBUG_FS */ |