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