Commit | Line | Data |
---|---|---|
d2876d08 DB |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
ff77c352 | 3 | #include <linux/interrupt.h> |
d2876d08 DB |
4 | #include <linux/irq.h> |
5 | #include <linux/spinlock.h> | |
1a989d0f | 6 | #include <linux/list.h> |
d8f388d8 DB |
7 | #include <linux/device.h> |
8 | #include <linux/err.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/gpio.h> | |
391c970c | 12 | #include <linux/of_gpio.h> |
ff77c352 | 13 | #include <linux/idr.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7b199811 | 15 | #include <linux/acpi.h> |
53e7cac3 | 16 | #include <linux/gpio/driver.h> |
0a6d3158 | 17 | #include <linux/gpio/machine.h> |
c771c2f4 | 18 | #include <linux/pinctrl/consumer.h> |
3c702e99 LW |
19 | #include <linux/cdev.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/uaccess.h> | |
8b92e17e | 22 | #include <linux/compat.h> |
d7c51b47 | 23 | #include <linux/anon_inodes.h> |
61f922db LW |
24 | #include <linux/kfifo.h> |
25 | #include <linux/poll.h> | |
26 | #include <linux/timekeeping.h> | |
3c702e99 | 27 | #include <uapi/linux/gpio.h> |
d2876d08 | 28 | |
664e3e5a MW |
29 | #include "gpiolib.h" |
30 | ||
3f397c21 UKK |
31 | #define CREATE_TRACE_POINTS |
32 | #include <trace/events/gpio.h> | |
d2876d08 | 33 | |
79a9becd | 34 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 35 | * |
79a9becd AC |
36 | * The GPIO programming interface allows for inlining speed-critical |
37 | * get/set operations for common cases, so that access to SOC-integrated | |
38 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
39 | */ |
40 | ||
41 | ||
42 | /* When debugging, extend minimal trust to callers and platform code. | |
43 | * Also emit diagnostic messages that may help initial bringup, when | |
44 | * board setup or driver bugs are most common. | |
45 | * | |
46 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
47 | */ | |
48 | #ifdef DEBUG | |
49 | #define extra_checks 1 | |
50 | #else | |
51 | #define extra_checks 0 | |
52 | #endif | |
53 | ||
ff2b1359 LW |
54 | /* Device and char device-related information */ |
55 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
56 | static dev_t gpio_devt; |
57 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
58 | static struct bus_type gpio_bus_type = { | |
59 | .name = "gpio", | |
60 | }; | |
ff2b1359 | 61 | |
d2876d08 DB |
62 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
63 | * While any GPIO is requested, its gpio_chip is not removable; | |
64 | * each GPIO's "requested" flag serves as a lock and refcount. | |
65 | */ | |
0eb4c6c2 | 66 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 67 | |
bae48da2 AC |
68 | static DEFINE_MUTEX(gpio_lookup_lock); |
69 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 70 | LIST_HEAD(gpio_devices); |
6d86750c JH |
71 | |
72 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
73 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
79b804cb MW |
74 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
75 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); | |
6d86750c | 76 | |
159f3cd9 | 77 | static bool gpiolib_initialized; |
6d86750c | 78 | |
d2876d08 DB |
79 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
80 | { | |
d2876d08 | 81 | d->label = label; |
d2876d08 DB |
82 | } |
83 | ||
372e722e AC |
84 | /** |
85 | * Convert a GPIO number to its descriptor | |
86 | */ | |
79a9becd | 87 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 88 | { |
ff2b1359 | 89 | struct gpio_device *gdev; |
14e85c0e AC |
90 | unsigned long flags; |
91 | ||
92 | spin_lock_irqsave(&gpio_lock, flags); | |
93 | ||
ff2b1359 | 94 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
95 | if (gdev->base <= gpio && |
96 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 97 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 98 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
99 | } |
100 | } | |
101 | ||
102 | spin_unlock_irqrestore(&gpio_lock, flags); | |
103 | ||
0e9a5edf AC |
104 | if (!gpio_is_valid(gpio)) |
105 | WARN(1, "invalid GPIO %d\n", gpio); | |
106 | ||
14e85c0e | 107 | return NULL; |
372e722e | 108 | } |
79a9becd | 109 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 110 | |
d468bf9e | 111 | /** |
bb1e88cc | 112 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 113 | */ |
bb1e88cc AC |
114 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
115 | u16 hwnum) | |
d468bf9e | 116 | { |
fdeb8e15 LW |
117 | struct gpio_device *gdev = chip->gpiodev; |
118 | ||
119 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 120 | return ERR_PTR(-EINVAL); |
d468bf9e | 121 | |
fdeb8e15 | 122 | return &gdev->descs[hwnum]; |
d468bf9e | 123 | } |
372e722e AC |
124 | |
125 | /** | |
126 | * Convert a GPIO descriptor to the integer namespace. | |
127 | * This should disappear in the future but is needed since we still | |
128 | * use GPIO numbers for error messages and sysfs nodes | |
129 | */ | |
79a9becd | 130 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 131 | { |
fdeb8e15 | 132 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 133 | } |
79a9becd | 134 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
135 | |
136 | ||
79a9becd AC |
137 | /** |
138 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
139 | * @desc: descriptor to return the chip of | |
140 | */ | |
141 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 142 | { |
fdeb8e15 LW |
143 | if (!desc || !desc->gdev || !desc->gdev->chip) |
144 | return NULL; | |
145 | return desc->gdev->chip; | |
372e722e | 146 | } |
79a9becd | 147 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 148 | |
8d0aab2f AV |
149 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
150 | static int gpiochip_find_base(int ngpio) | |
151 | { | |
ff2b1359 | 152 | struct gpio_device *gdev; |
83cabe33 | 153 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 154 | |
ff2b1359 | 155 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 156 | /* found a free space? */ |
fdeb8e15 | 157 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
158 | break; |
159 | else | |
160 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 161 | base = gdev->base - ngpio; |
8d0aab2f AV |
162 | } |
163 | ||
83cabe33 | 164 | if (gpio_is_valid(base)) { |
8d0aab2f | 165 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
166 | return base; |
167 | } else { | |
168 | pr_err("%s: cannot find free range\n", __func__); | |
169 | return -ENOSPC; | |
169b6a7a | 170 | } |
169b6a7a AV |
171 | } |
172 | ||
79a9becd AC |
173 | /** |
174 | * gpiod_get_direction - return the current direction of a GPIO | |
175 | * @desc: GPIO to get the direction of | |
176 | * | |
177 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
178 | * | |
179 | * This function may sleep if gpiod_cansleep() is true. | |
180 | */ | |
8e53b0f1 | 181 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
182 | { |
183 | struct gpio_chip *chip; | |
372e722e | 184 | unsigned offset; |
80b0a602 MN |
185 | int status = -EINVAL; |
186 | ||
372e722e AC |
187 | chip = gpiod_to_chip(desc); |
188 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
189 | |
190 | if (!chip->get_direction) | |
191 | return status; | |
192 | ||
372e722e | 193 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
194 | if (status > 0) { |
195 | /* GPIOF_DIR_IN, or other positive */ | |
196 | status = 1; | |
8e53b0f1 | 197 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
198 | } |
199 | if (status == 0) { | |
200 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 201 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
202 | } |
203 | return status; | |
204 | } | |
79a9becd | 205 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 206 | |
1a989d0f AC |
207 | /* |
208 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 209 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
210 | * |
211 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
212 | * space. | |
213 | */ | |
ff2b1359 | 214 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 215 | { |
a961f9b4 | 216 | struct gpio_device *prev, *next; |
1a989d0f | 217 | |
ff2b1359 | 218 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 219 | /* initial entry in list */ |
ff2b1359 | 220 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 221 | return 0; |
1a989d0f AC |
222 | } |
223 | ||
a961f9b4 BJZ |
224 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
225 | if (gdev->base + gdev->ngpio <= next->base) { | |
226 | /* add before first entry */ | |
227 | list_add(&gdev->list, &gpio_devices); | |
228 | return 0; | |
1a989d0f AC |
229 | } |
230 | ||
a961f9b4 BJZ |
231 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
232 | if (prev->base + prev->ngpio <= gdev->base) { | |
233 | /* add behind last entry */ | |
234 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 235 | return 0; |
1a989d0f AC |
236 | } |
237 | ||
a961f9b4 BJZ |
238 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
239 | /* at the end of the list */ | |
240 | if (&next->list == &gpio_devices) | |
241 | break; | |
1a989d0f | 242 | |
a961f9b4 BJZ |
243 | /* add between prev and next */ |
244 | if (prev->base + prev->ngpio <= gdev->base | |
245 | && gdev->base + gdev->ngpio <= next->base) { | |
246 | list_add(&gdev->list, &prev->list); | |
247 | return 0; | |
248 | } | |
249 | } | |
250 | ||
251 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
252 | return -EBUSY; | |
1a989d0f AC |
253 | } |
254 | ||
f881bab0 LW |
255 | /** |
256 | * Convert a GPIO name to its descriptor | |
257 | */ | |
258 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
259 | { | |
ff2b1359 | 260 | struct gpio_device *gdev; |
f881bab0 LW |
261 | unsigned long flags; |
262 | ||
263 | spin_lock_irqsave(&gpio_lock, flags); | |
264 | ||
ff2b1359 | 265 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
266 | int i; |
267 | ||
fdeb8e15 LW |
268 | for (i = 0; i != gdev->ngpio; ++i) { |
269 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 270 | |
fdeb8e15 | 271 | if (!desc->name || !name) |
f881bab0 LW |
272 | continue; |
273 | ||
fdeb8e15 | 274 | if (!strcmp(desc->name, name)) { |
f881bab0 | 275 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 276 | return desc; |
f881bab0 LW |
277 | } |
278 | } | |
279 | } | |
280 | ||
281 | spin_unlock_irqrestore(&gpio_lock, flags); | |
282 | ||
283 | return NULL; | |
284 | } | |
285 | ||
5f3ca732 MP |
286 | /* |
287 | * Takes the names from gc->names and checks if they are all unique. If they | |
288 | * are, they are assigned to their gpio descriptors. | |
289 | * | |
ed37915c | 290 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
291 | */ |
292 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
293 | { | |
fdeb8e15 | 294 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
295 | int i; |
296 | ||
297 | if (!gc->names) | |
298 | return 0; | |
299 | ||
300 | /* First check all names if they are unique */ | |
301 | for (i = 0; i != gc->ngpio; ++i) { | |
302 | struct gpio_desc *gpio; | |
303 | ||
304 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 305 | if (gpio) |
fdeb8e15 | 306 | dev_warn(&gdev->dev, |
34ffd85d | 307 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 308 | gc->names[i]); |
5f3ca732 MP |
309 | } |
310 | ||
311 | /* Then add all names to the GPIO descriptors */ | |
312 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 313 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
314 | |
315 | return 0; | |
316 | } | |
317 | ||
d7c51b47 LW |
318 | /* |
319 | * GPIO line handle management | |
320 | */ | |
321 | ||
322 | /** | |
323 | * struct linehandle_state - contains the state of a userspace handle | |
324 | * @gdev: the GPIO device the handle pertains to | |
325 | * @label: consumer label used to tag descriptors | |
326 | * @descs: the GPIO descriptors held by this handle | |
327 | * @numdescs: the number of descriptors held in the descs array | |
328 | */ | |
329 | struct linehandle_state { | |
330 | struct gpio_device *gdev; | |
331 | const char *label; | |
332 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
333 | u32 numdescs; | |
334 | }; | |
335 | ||
336 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, | |
337 | unsigned long arg) | |
338 | { | |
339 | struct linehandle_state *lh = filep->private_data; | |
340 | void __user *ip = (void __user *)arg; | |
341 | struct gpiohandle_data ghd; | |
342 | int i; | |
343 | ||
344 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
345 | int val; | |
346 | ||
347 | /* TODO: check if descriptors are really input */ | |
348 | for (i = 0; i < lh->numdescs; i++) { | |
349 | val = gpiod_get_value_cansleep(lh->descs[i]); | |
350 | if (val < 0) | |
351 | return val; | |
352 | ghd.values[i] = val; | |
353 | } | |
354 | ||
355 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
356 | return -EFAULT; | |
357 | ||
358 | return 0; | |
359 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
360 | int vals[GPIOHANDLES_MAX]; | |
361 | ||
362 | /* TODO: check if descriptors are really output */ | |
363 | if (copy_from_user(&ghd, ip, sizeof(ghd))) | |
364 | return -EFAULT; | |
365 | ||
366 | /* Clamp all values to [0,1] */ | |
367 | for (i = 0; i < lh->numdescs; i++) | |
368 | vals[i] = !!ghd.values[i]; | |
369 | ||
370 | /* Reuse the array setting function */ | |
371 | gpiod_set_array_value_complex(false, | |
372 | true, | |
373 | lh->numdescs, | |
374 | lh->descs, | |
375 | vals); | |
376 | return 0; | |
377 | } | |
378 | return -EINVAL; | |
379 | } | |
380 | ||
381 | #ifdef CONFIG_COMPAT | |
382 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
383 | unsigned long arg) | |
384 | { | |
385 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
386 | } | |
387 | #endif | |
388 | ||
389 | static int linehandle_release(struct inode *inode, struct file *filep) | |
390 | { | |
391 | struct linehandle_state *lh = filep->private_data; | |
392 | struct gpio_device *gdev = lh->gdev; | |
393 | int i; | |
394 | ||
395 | for (i = 0; i < lh->numdescs; i++) | |
396 | gpiod_free(lh->descs[i]); | |
397 | kfree(lh->label); | |
398 | kfree(lh); | |
399 | put_device(&gdev->dev); | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static const struct file_operations linehandle_fileops = { | |
404 | .release = linehandle_release, | |
405 | .owner = THIS_MODULE, | |
406 | .llseek = noop_llseek, | |
407 | .unlocked_ioctl = linehandle_ioctl, | |
408 | #ifdef CONFIG_COMPAT | |
409 | .compat_ioctl = linehandle_ioctl_compat, | |
410 | #endif | |
411 | }; | |
412 | ||
413 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
414 | { | |
415 | struct gpiohandle_request handlereq; | |
416 | struct linehandle_state *lh; | |
417 | int fd, i, ret; | |
418 | ||
419 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
420 | return -EFAULT; | |
421 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
422 | return -EINVAL; | |
423 | ||
424 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); | |
425 | if (!lh) | |
426 | return -ENOMEM; | |
427 | lh->gdev = gdev; | |
428 | get_device(&gdev->dev); | |
429 | ||
430 | /* Make sure this is terminated */ | |
431 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
432 | if (strlen(handlereq.consumer_label)) { | |
433 | lh->label = kstrdup(handlereq.consumer_label, | |
434 | GFP_KERNEL); | |
435 | if (!lh->label) { | |
436 | ret = -ENOMEM; | |
437 | goto out_free_lh; | |
438 | } | |
439 | } | |
440 | ||
441 | /* Request each GPIO */ | |
442 | for (i = 0; i < handlereq.lines; i++) { | |
443 | u32 offset = handlereq.lineoffsets[i]; | |
444 | u32 lflags = handlereq.flags; | |
445 | struct gpio_desc *desc; | |
446 | ||
e405f9fc LPC |
447 | if (offset >= gdev->ngpio) { |
448 | ret = -EINVAL; | |
449 | goto out_free_descs; | |
450 | } | |
451 | ||
d7c51b47 LW |
452 | desc = &gdev->descs[offset]; |
453 | ret = gpiod_request(desc, lh->label); | |
454 | if (ret) | |
455 | goto out_free_descs; | |
456 | lh->descs[i] = desc; | |
457 | ||
458 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
459 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
460 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
461 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
462 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
463 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
464 | ||
465 | /* | |
466 | * Lines have to be requested explicitly for input | |
467 | * or output, else the line will be treated "as is". | |
468 | */ | |
469 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
470 | int val = !!handlereq.default_values[i]; | |
471 | ||
472 | ret = gpiod_direction_output(desc, val); | |
473 | if (ret) | |
474 | goto out_free_descs; | |
475 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
476 | ret = gpiod_direction_input(desc); | |
477 | if (ret) | |
478 | goto out_free_descs; | |
479 | } | |
480 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
481 | offset); | |
482 | } | |
e2f608be LW |
483 | /* Let i point at the last handle */ |
484 | i--; | |
d7c51b47 LW |
485 | lh->numdescs = handlereq.lines; |
486 | ||
487 | fd = anon_inode_getfd("gpio-linehandle", | |
488 | &linehandle_fileops, | |
489 | lh, | |
490 | O_RDONLY | O_CLOEXEC); | |
491 | if (fd < 0) { | |
492 | ret = fd; | |
493 | goto out_free_descs; | |
494 | } | |
495 | ||
496 | handlereq.fd = fd; | |
d932cd49 LW |
497 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
498 | ret = -EFAULT; | |
499 | goto out_free_descs; | |
500 | } | |
d7c51b47 LW |
501 | |
502 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", | |
503 | lh->numdescs); | |
504 | ||
505 | return 0; | |
506 | ||
507 | out_free_descs: | |
508 | for (; i >= 0; i--) | |
509 | gpiod_free(lh->descs[i]); | |
510 | kfree(lh->label); | |
511 | out_free_lh: | |
512 | kfree(lh); | |
513 | put_device(&gdev->dev); | |
514 | return ret; | |
515 | } | |
516 | ||
61f922db LW |
517 | /* |
518 | * GPIO line event management | |
519 | */ | |
520 | ||
521 | /** | |
522 | * struct lineevent_state - contains the state of a userspace event | |
523 | * @gdev: the GPIO device the event pertains to | |
524 | * @label: consumer label used to tag descriptors | |
525 | * @desc: the GPIO descriptor held by this event | |
526 | * @eflags: the event flags this line was requested with | |
527 | * @irq: the interrupt that trigger in response to events on this GPIO | |
528 | * @wait: wait queue that handles blocking reads of events | |
529 | * @events: KFIFO for the GPIO events | |
530 | * @read_lock: mutex lock to protect reads from colliding with adding | |
531 | * new events to the FIFO | |
532 | */ | |
533 | struct lineevent_state { | |
534 | struct gpio_device *gdev; | |
535 | const char *label; | |
536 | struct gpio_desc *desc; | |
537 | u32 eflags; | |
538 | int irq; | |
539 | wait_queue_head_t wait; | |
540 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
541 | struct mutex read_lock; | |
542 | }; | |
543 | ||
544 | static unsigned int lineevent_poll(struct file *filep, | |
545 | struct poll_table_struct *wait) | |
546 | { | |
547 | struct lineevent_state *le = filep->private_data; | |
548 | unsigned int events = 0; | |
549 | ||
550 | poll_wait(filep, &le->wait, wait); | |
551 | ||
552 | if (!kfifo_is_empty(&le->events)) | |
553 | events = POLLIN | POLLRDNORM; | |
554 | ||
555 | return events; | |
556 | } | |
557 | ||
558 | ||
559 | static ssize_t lineevent_read(struct file *filep, | |
560 | char __user *buf, | |
561 | size_t count, | |
562 | loff_t *f_ps) | |
563 | { | |
564 | struct lineevent_state *le = filep->private_data; | |
565 | unsigned int copied; | |
566 | int ret; | |
567 | ||
568 | if (count < sizeof(struct gpioevent_data)) | |
569 | return -EINVAL; | |
570 | ||
571 | do { | |
572 | if (kfifo_is_empty(&le->events)) { | |
573 | if (filep->f_flags & O_NONBLOCK) | |
574 | return -EAGAIN; | |
575 | ||
576 | ret = wait_event_interruptible(le->wait, | |
577 | !kfifo_is_empty(&le->events)); | |
578 | if (ret) | |
579 | return ret; | |
580 | } | |
581 | ||
582 | if (mutex_lock_interruptible(&le->read_lock)) | |
583 | return -ERESTARTSYS; | |
584 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
585 | mutex_unlock(&le->read_lock); | |
586 | ||
587 | if (ret) | |
588 | return ret; | |
589 | ||
590 | /* | |
591 | * If we couldn't read anything from the fifo (a different | |
592 | * thread might have been faster) we either return -EAGAIN if | |
593 | * the file descriptor is non-blocking, otherwise we go back to | |
594 | * sleep and wait for more data to arrive. | |
595 | */ | |
596 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
597 | return -EAGAIN; | |
598 | ||
599 | } while (copied == 0); | |
600 | ||
601 | return copied; | |
602 | } | |
603 | ||
604 | static int lineevent_release(struct inode *inode, struct file *filep) | |
605 | { | |
606 | struct lineevent_state *le = filep->private_data; | |
607 | struct gpio_device *gdev = le->gdev; | |
608 | ||
609 | free_irq(le->irq, le); | |
610 | gpiod_free(le->desc); | |
611 | kfree(le->label); | |
612 | kfree(le); | |
613 | put_device(&gdev->dev); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
618 | unsigned long arg) | |
619 | { | |
620 | struct lineevent_state *le = filep->private_data; | |
621 | void __user *ip = (void __user *)arg; | |
622 | struct gpiohandle_data ghd; | |
623 | ||
624 | /* | |
625 | * We can get the value for an event line but not set it, | |
626 | * because it is input by definition. | |
627 | */ | |
628 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
629 | int val; | |
630 | ||
d82aa4a8 LPC |
631 | memset(&ghd, 0, sizeof(ghd)); |
632 | ||
61f922db LW |
633 | val = gpiod_get_value_cansleep(le->desc); |
634 | if (val < 0) | |
635 | return val; | |
636 | ghd.values[0] = val; | |
637 | ||
638 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
639 | return -EFAULT; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | #ifdef CONFIG_COMPAT | |
647 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
648 | unsigned long arg) | |
649 | { | |
650 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
651 | } | |
652 | #endif | |
653 | ||
654 | static const struct file_operations lineevent_fileops = { | |
655 | .release = lineevent_release, | |
656 | .read = lineevent_read, | |
657 | .poll = lineevent_poll, | |
658 | .owner = THIS_MODULE, | |
659 | .llseek = noop_llseek, | |
660 | .unlocked_ioctl = lineevent_ioctl, | |
661 | #ifdef CONFIG_COMPAT | |
662 | .compat_ioctl = lineevent_ioctl_compat, | |
663 | #endif | |
664 | }; | |
665 | ||
33265b17 | 666 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
667 | { |
668 | struct lineevent_state *le = p; | |
669 | struct gpioevent_data ge; | |
670 | int ret; | |
671 | ||
672 | ge.timestamp = ktime_get_real_ns(); | |
673 | ||
674 | if (le->eflags & GPIOEVENT_REQUEST_BOTH_EDGES) { | |
675 | int level = gpiod_get_value_cansleep(le->desc); | |
676 | ||
677 | if (level) | |
678 | /* Emit low-to-high event */ | |
679 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
680 | else | |
681 | /* Emit high-to-low event */ | |
682 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
683 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) { | |
684 | /* Emit low-to-high event */ | |
685 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
686 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
687 | /* Emit high-to-low event */ | |
688 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
689 | } else { |
690 | return IRQ_NONE; | |
61f922db LW |
691 | } |
692 | ||
693 | ret = kfifo_put(&le->events, ge); | |
694 | if (ret != 0) | |
695 | wake_up_poll(&le->wait, POLLIN); | |
696 | ||
697 | return IRQ_HANDLED; | |
698 | } | |
699 | ||
700 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) | |
701 | { | |
702 | struct gpioevent_request eventreq; | |
703 | struct lineevent_state *le; | |
704 | struct gpio_desc *desc; | |
705 | u32 offset; | |
706 | u32 lflags; | |
707 | u32 eflags; | |
708 | int fd; | |
709 | int ret; | |
710 | int irqflags = 0; | |
711 | ||
712 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
713 | return -EFAULT; | |
714 | ||
715 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
716 | if (!le) | |
717 | return -ENOMEM; | |
718 | le->gdev = gdev; | |
719 | get_device(&gdev->dev); | |
720 | ||
721 | /* Make sure this is terminated */ | |
722 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
723 | if (strlen(eventreq.consumer_label)) { | |
724 | le->label = kstrdup(eventreq.consumer_label, | |
725 | GFP_KERNEL); | |
726 | if (!le->label) { | |
727 | ret = -ENOMEM; | |
728 | goto out_free_le; | |
729 | } | |
730 | } | |
731 | ||
732 | offset = eventreq.lineoffset; | |
733 | lflags = eventreq.handleflags; | |
734 | eflags = eventreq.eventflags; | |
735 | ||
736 | /* This is just wrong: we don't look for events on output lines */ | |
737 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
738 | ret = -EINVAL; | |
739 | goto out_free_label; | |
740 | } | |
741 | ||
742 | desc = &gdev->descs[offset]; | |
743 | ret = gpiod_request(desc, le->label); | |
744 | if (ret) | |
745 | goto out_free_desc; | |
746 | le->desc = desc; | |
747 | le->eflags = eflags; | |
748 | ||
749 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
750 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
751 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
752 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
753 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
754 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
755 | ||
756 | ret = gpiod_direction_input(desc); | |
757 | if (ret) | |
758 | goto out_free_desc; | |
759 | ||
760 | le->irq = gpiod_to_irq(desc); | |
761 | if (le->irq <= 0) { | |
762 | ret = -ENODEV; | |
763 | goto out_free_desc; | |
764 | } | |
765 | ||
766 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
767 | irqflags |= IRQF_TRIGGER_RISING; | |
768 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
769 | irqflags |= IRQF_TRIGGER_FALLING; | |
770 | irqflags |= IRQF_ONESHOT; | |
771 | irqflags |= IRQF_SHARED; | |
772 | ||
773 | INIT_KFIFO(le->events); | |
774 | init_waitqueue_head(&le->wait); | |
775 | mutex_init(&le->read_lock); | |
776 | ||
777 | /* Request a thread to read the events */ | |
778 | ret = request_threaded_irq(le->irq, | |
779 | NULL, | |
780 | lineevent_irq_thread, | |
781 | irqflags, | |
782 | le->label, | |
783 | le); | |
784 | if (ret) | |
785 | goto out_free_desc; | |
786 | ||
787 | fd = anon_inode_getfd("gpio-event", | |
788 | &lineevent_fileops, | |
789 | le, | |
790 | O_RDONLY | O_CLOEXEC); | |
791 | if (fd < 0) { | |
792 | ret = fd; | |
793 | goto out_free_irq; | |
794 | } | |
795 | ||
796 | eventreq.fd = fd; | |
d932cd49 LW |
797 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
798 | ret = -EFAULT; | |
799 | goto out_free_irq; | |
800 | } | |
61f922db LW |
801 | |
802 | return 0; | |
803 | ||
804 | out_free_irq: | |
805 | free_irq(le->irq, le); | |
806 | out_free_desc: | |
807 | gpiod_free(le->desc); | |
808 | out_free_label: | |
809 | kfree(le->label); | |
810 | out_free_le: | |
811 | kfree(le); | |
812 | put_device(&gdev->dev); | |
813 | return ret; | |
814 | } | |
815 | ||
3c702e99 LW |
816 | /** |
817 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
818 | */ | |
819 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
820 | { | |
821 | struct gpio_device *gdev = filp->private_data; | |
822 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 823 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
824 | |
825 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
826 | if (!chip) | |
827 | return -ENODEV; | |
828 | ||
521a2ad6 | 829 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 830 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
831 | struct gpiochip_info chipinfo; |
832 | ||
0f4bbb23 LPC |
833 | memset(&chipinfo, 0, sizeof(chipinfo)); |
834 | ||
3c702e99 LW |
835 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
836 | sizeof(chipinfo.name)); | |
837 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
838 | strncpy(chipinfo.label, gdev->label, |
839 | sizeof(chipinfo.label)); | |
840 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 841 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
842 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
843 | return -EFAULT; | |
844 | return 0; | |
521a2ad6 LW |
845 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
846 | struct gpioline_info lineinfo; | |
847 | struct gpio_desc *desc; | |
848 | ||
849 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
850 | return -EFAULT; | |
1f1cc456 | 851 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
852 | return -EINVAL; |
853 | ||
854 | desc = &gdev->descs[lineinfo.line_offset]; | |
855 | if (desc->name) { | |
856 | strncpy(lineinfo.name, desc->name, | |
857 | sizeof(lineinfo.name)); | |
858 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
859 | } else { | |
860 | lineinfo.name[0] = '\0'; | |
861 | } | |
862 | if (desc->label) { | |
214338e3 LW |
863 | strncpy(lineinfo.consumer, desc->label, |
864 | sizeof(lineinfo.consumer)); | |
865 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 866 | } else { |
214338e3 | 867 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
868 | } |
869 | ||
870 | /* | |
871 | * Userspace only need to know that the kernel is using | |
872 | * this GPIO so it can't use it. | |
873 | */ | |
874 | lineinfo.flags = 0; | |
9d8cc89c LW |
875 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
876 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
877 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
878 | test_bit(FLAG_EXPORT, &desc->flags) || | |
879 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 880 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 881 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 882 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 883 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 884 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 885 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 886 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 887 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
888 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
889 | ||
890 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
891 | return -EFAULT; | |
892 | return 0; | |
d7c51b47 LW |
893 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
894 | return linehandle_create(gdev, ip); | |
61f922db LW |
895 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
896 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
897 | } |
898 | return -EINVAL; | |
899 | } | |
900 | ||
8b92e17e LW |
901 | #ifdef CONFIG_COMPAT |
902 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
903 | unsigned long arg) | |
904 | { | |
905 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
906 | } | |
907 | #endif | |
908 | ||
3c702e99 LW |
909 | /** |
910 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
911 | * @inode: inode for this chardev | |
912 | * @filp: file struct for storing private data | |
913 | * Returns 0 on success | |
914 | */ | |
915 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
916 | { | |
917 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
918 | struct gpio_device, chrdev); | |
919 | ||
920 | /* Fail on open if the backing gpiochip is gone */ | |
921 | if (!gdev || !gdev->chip) | |
922 | return -ENODEV; | |
923 | get_device(&gdev->dev); | |
924 | filp->private_data = gdev; | |
925 | return 0; | |
926 | } | |
927 | ||
928 | /** | |
929 | * gpio_chrdev_release() - close chardev after ioctl operations | |
930 | * @inode: inode for this chardev | |
931 | * @filp: file struct for storing private data | |
932 | * Returns 0 on success | |
933 | */ | |
934 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
935 | { | |
936 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
937 | struct gpio_device, chrdev); | |
938 | ||
939 | if (!gdev) | |
940 | return -ENODEV; | |
941 | put_device(&gdev->dev); | |
942 | return 0; | |
943 | } | |
944 | ||
945 | ||
946 | static const struct file_operations gpio_fileops = { | |
947 | .release = gpio_chrdev_release, | |
948 | .open = gpio_chrdev_open, | |
949 | .owner = THIS_MODULE, | |
950 | .llseek = noop_llseek, | |
951 | .unlocked_ioctl = gpio_ioctl, | |
8b92e17e LW |
952 | #ifdef CONFIG_COMPAT |
953 | .compat_ioctl = gpio_ioctl_compat, | |
954 | #endif | |
3c702e99 LW |
955 | }; |
956 | ||
ff2b1359 LW |
957 | static void gpiodevice_release(struct device *dev) |
958 | { | |
959 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
960 | ||
961 | list_del(&gdev->list); | |
962 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
963 | kfree(gdev->label); |
964 | kfree(gdev->descs); | |
9efd9e69 | 965 | kfree(gdev); |
ff2b1359 LW |
966 | } |
967 | ||
159f3cd9 GR |
968 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
969 | { | |
970 | int status; | |
971 | ||
972 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
973 | gdev->chrdev.owner = THIS_MODULE; | |
974 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
975 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
976 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
977 | if (status < 0) | |
978 | chip_warn(gdev->chip, "failed to add char device %d:%d\n", | |
979 | MAJOR(gpio_devt), gdev->id); | |
980 | else | |
981 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
982 | MAJOR(gpio_devt), gdev->id); | |
983 | status = device_add(&gdev->dev); | |
984 | if (status) | |
985 | goto err_remove_chardev; | |
986 | ||
987 | status = gpiochip_sysfs_register(gdev); | |
988 | if (status) | |
989 | goto err_remove_device; | |
990 | ||
991 | /* From this point, the .release() function cleans up gpio_device */ | |
992 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
993 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
994 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
995 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
996 | ||
997 | return 0; | |
998 | ||
999 | err_remove_device: | |
1000 | device_del(&gdev->dev); | |
1001 | err_remove_chardev: | |
1002 | cdev_del(&gdev->chrdev); | |
1003 | return status; | |
1004 | } | |
1005 | ||
1006 | static void gpiochip_setup_devs(void) | |
1007 | { | |
1008 | struct gpio_device *gdev; | |
1009 | int err; | |
1010 | ||
1011 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1012 | err = gpiochip_setup_dev(gdev); | |
1013 | if (err) | |
1014 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1015 | dev_name(&gdev->dev), err); | |
1016 | } | |
1017 | } | |
1018 | ||
d2876d08 | 1019 | /** |
b08ea35a | 1020 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 1021 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 1022 | * Context: potentially before irqs will work |
d2876d08 DB |
1023 | * |
1024 | * Returns a negative errno if the chip can't be registered, such as | |
1025 | * because the chip->base is invalid or already associated with a | |
1026 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 1027 | * |
b08ea35a | 1028 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 1029 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
1030 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
1031 | * for GPIOs will fail rudely. | |
1032 | * | |
159f3cd9 GR |
1033 | * gpiochip_add_data() must only be called after gpiolib initialization, |
1034 | * ie after core_initcall(). | |
1035 | * | |
8d0aab2f AV |
1036 | * If chip->base is negative, this requests dynamic assignment of |
1037 | * a range of valid GPIOs. | |
d2876d08 | 1038 | */ |
b08ea35a | 1039 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
1040 | { |
1041 | unsigned long flags; | |
1042 | int status = 0; | |
ff2b1359 | 1043 | unsigned i; |
8d0aab2f | 1044 | int base = chip->base; |
ff2b1359 | 1045 | struct gpio_device *gdev; |
d2876d08 | 1046 | |
ff2b1359 LW |
1047 | /* |
1048 | * First: allocate and populate the internal stat container, and | |
1049 | * set up the struct device. | |
1050 | */ | |
969f07b4 | 1051 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1052 | if (!gdev) |
14e85c0e | 1053 | return -ENOMEM; |
3c702e99 | 1054 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1055 | gdev->chip = chip; |
1056 | chip->gpiodev = gdev; | |
1057 | if (chip->parent) { | |
1058 | gdev->dev.parent = chip->parent; | |
1059 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1060 | } |
1061 | ||
ff2b1359 LW |
1062 | #ifdef CONFIG_OF_GPIO |
1063 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1064 | if (chip->of_node) |
1065 | gdev->dev.of_node = chip->of_node; | |
ff2b1359 | 1066 | #endif |
acc6e331 | 1067 | |
ff2b1359 LW |
1068 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1069 | if (gdev->id < 0) { | |
1070 | status = gdev->id; | |
1071 | goto err_free_gdev; | |
1072 | } | |
1073 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1074 | device_initialize(&gdev->dev); | |
1075 | dev_set_drvdata(&gdev->dev, gdev); | |
1076 | if (chip->parent && chip->parent->driver) | |
1077 | gdev->owner = chip->parent->driver->owner; | |
1078 | else if (chip->owner) | |
1079 | /* TODO: remove chip->owner */ | |
1080 | gdev->owner = chip->owner; | |
1081 | else | |
1082 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1083 | |
476e2fc5 | 1084 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1085 | if (!gdev->descs) { |
ff2b1359 LW |
1086 | status = -ENOMEM; |
1087 | goto err_free_gdev; | |
1088 | } | |
1089 | ||
5ed41cc4 BJZ |
1090 | if (chip->ngpio == 0) { |
1091 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1092 | status = -EINVAL; |
159f3cd9 | 1093 | goto err_free_descs; |
5ed41cc4 | 1094 | } |
df4878e9 LW |
1095 | |
1096 | if (chip->label) | |
476e2fc5 | 1097 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 1098 | else |
476e2fc5 | 1099 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
1100 | if (!gdev->label) { |
1101 | status = -ENOMEM; | |
476e2fc5 | 1102 | goto err_free_descs; |
df4878e9 LW |
1103 | } |
1104 | ||
fdeb8e15 | 1105 | gdev->ngpio = chip->ngpio; |
43c54eca | 1106 | gdev->data = data; |
5ed41cc4 | 1107 | |
d2876d08 DB |
1108 | spin_lock_irqsave(&gpio_lock, flags); |
1109 | ||
fdeb8e15 LW |
1110 | /* |
1111 | * TODO: this allocates a Linux GPIO number base in the global | |
1112 | * GPIO numberspace for this chip. In the long run we want to | |
1113 | * get *rid* of this numberspace and use only descriptors, but | |
1114 | * it may be a pipe dream. It will not happen before we get rid | |
1115 | * of the sysfs interface anyways. | |
1116 | */ | |
8d0aab2f AV |
1117 | if (base < 0) { |
1118 | base = gpiochip_find_base(chip->ngpio); | |
1119 | if (base < 0) { | |
1120 | status = base; | |
225fce83 | 1121 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1122 | goto err_free_label; |
8d0aab2f | 1123 | } |
fdeb8e15 LW |
1124 | /* |
1125 | * TODO: it should not be necessary to reflect the assigned | |
1126 | * base outside of the GPIO subsystem. Go over drivers and | |
1127 | * see if anyone makes use of this, else drop this and assign | |
1128 | * a poison instead. | |
1129 | */ | |
8d0aab2f AV |
1130 | chip->base = base; |
1131 | } | |
fdeb8e15 | 1132 | gdev->base = base; |
8d0aab2f | 1133 | |
ff2b1359 | 1134 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1135 | if (status) { |
1136 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1137 | goto err_free_label; |
05aa5203 | 1138 | } |
1a989d0f | 1139 | |
545ebd9a LW |
1140 | spin_unlock_irqrestore(&gpio_lock, flags); |
1141 | ||
ff2b1359 | 1142 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1143 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1144 | |
fdeb8e15 | 1145 | desc->gdev = gdev; |
72d32000 LW |
1146 | /* |
1147 | * REVISIT: most hardware initializes GPIOs as inputs | |
1148 | * (often with pullups enabled) so power usage is | |
1149 | * minimized. Linux code should set the gpio direction | |
1150 | * first thing; but until it does, and in case | |
1151 | * chip->get_direction is not set, we may expose the | |
1152 | * wrong direction in sysfs. | |
05aa5203 | 1153 | */ |
72d32000 LW |
1154 | |
1155 | if (chip->get_direction) { | |
1156 | /* | |
1157 | * If we have .get_direction, set up the initial | |
1158 | * direction flag from the hardware. | |
1159 | */ | |
1160 | int dir = chip->get_direction(chip, i); | |
1161 | ||
1162 | if (!dir) | |
1163 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1164 | } else if (!chip->direction_input) { | |
1165 | /* | |
1166 | * If the chip lacks the .direction_input callback | |
1167 | * we logically assume all lines are outputs. | |
1168 | */ | |
1169 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1170 | } | |
d2876d08 | 1171 | } |
14e85c0e | 1172 | |
f23f1516 | 1173 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1174 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1175 | #endif |
1176 | ||
5f3ca732 MP |
1177 | status = gpiochip_set_desc_names(chip); |
1178 | if (status) | |
1179 | goto err_remove_from_list; | |
1180 | ||
79b804cb MW |
1181 | status = gpiochip_irqchip_init_valid_mask(chip); |
1182 | if (status) | |
1183 | goto err_remove_from_list; | |
1184 | ||
28355f81 TV |
1185 | status = of_gpiochip_add(chip); |
1186 | if (status) | |
1187 | goto err_remove_chip; | |
1188 | ||
664e3e5a | 1189 | acpi_gpiochip_add(chip); |
391c970c | 1190 | |
3c702e99 LW |
1191 | /* |
1192 | * By first adding the chardev, and then adding the device, | |
1193 | * we get a device node entry in sysfs under | |
1194 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1195 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1196 | * We can do this only if gpiolib has been initialized. |
1197 | * Otherwise, defer until later. | |
3c702e99 | 1198 | */ |
159f3cd9 GR |
1199 | if (gpiolib_initialized) { |
1200 | status = gpiochip_setup_dev(gdev); | |
1201 | if (status) | |
1202 | goto err_remove_chip; | |
1203 | } | |
cedb1881 | 1204 | return 0; |
3bae4811 | 1205 | |
225fce83 JH |
1206 | err_remove_chip: |
1207 | acpi_gpiochip_remove(chip); | |
6d86750c | 1208 | gpiochip_free_hogs(chip); |
225fce83 | 1209 | of_gpiochip_remove(chip); |
79b804cb | 1210 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1211 | err_remove_from_list: |
225fce83 | 1212 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1213 | list_del(&gdev->list); |
3bae4811 | 1214 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
1215 | err_free_label: |
1216 | kfree(gdev->label); | |
1217 | err_free_descs: | |
1218 | kfree(gdev->descs); | |
ff2b1359 LW |
1219 | err_free_gdev: |
1220 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1221 | /* failures here can mean systems won't boot... */ |
7589e59f | 1222 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
1223 | gdev->base, gdev->base + gdev->ngpio - 1, |
1224 | chip->label ? : "generic"); | |
1225 | kfree(gdev); | |
d2876d08 DB |
1226 | return status; |
1227 | } | |
b08ea35a | 1228 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 1229 | |
43c54eca LW |
1230 | /** |
1231 | * gpiochip_get_data() - get per-subdriver data for the chip | |
1232 | */ | |
1233 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1234 | { | |
1235 | return chip->gpiodev->data; | |
1236 | } | |
1237 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1238 | ||
d2876d08 DB |
1239 | /** |
1240 | * gpiochip_remove() - unregister a gpio_chip | |
1241 | * @chip: the chip to unregister | |
1242 | * | |
1243 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1244 | */ | |
e1db1706 | 1245 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1246 | { |
ff2b1359 | 1247 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1248 | struct gpio_desc *desc; |
d2876d08 | 1249 | unsigned long flags; |
1c3cdb18 | 1250 | unsigned i; |
fab28b89 | 1251 | bool requested = false; |
d2876d08 | 1252 | |
ff2b1359 | 1253 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1254 | gpiochip_sysfs_unregister(gdev); |
bd203bd5 BJZ |
1255 | /* Numb the device, cancelling all outstanding operations */ |
1256 | gdev->chip = NULL; | |
00acc3dc | 1257 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1258 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1259 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 1260 | gpiochip_free_hogs(chip); |
391c970c | 1261 | of_gpiochip_remove(chip); |
43c54eca LW |
1262 | /* |
1263 | * We accept no more calls into the driver from this point, so | |
1264 | * NULL the driver data pointer | |
1265 | */ | |
1266 | gdev->data = NULL; | |
391c970c | 1267 | |
6798acaa | 1268 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1269 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1270 | desc = &gdev->descs[i]; |
fab28b89 JH |
1271 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1272 | requested = true; | |
d2876d08 | 1273 | } |
d2876d08 | 1274 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1275 | |
fab28b89 | 1276 | if (requested) |
fdeb8e15 | 1277 | dev_crit(&gdev->dev, |
58383c78 | 1278 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1279 | |
ff2b1359 LW |
1280 | /* |
1281 | * The gpiochip side puts its use of the device to rest here: | |
1282 | * if there are no userspace clients, the chardev and device will | |
1283 | * be removed, else it will be dangling until the last user is | |
1284 | * gone. | |
1285 | */ | |
f4833b8c RRD |
1286 | cdev_del(&gdev->chrdev); |
1287 | device_del(&gdev->dev); | |
ff2b1359 | 1288 | put_device(&gdev->dev); |
d2876d08 DB |
1289 | } |
1290 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1291 | ||
0cf3292c LD |
1292 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1293 | { | |
1294 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1295 | ||
1296 | gpiochip_remove(chip); | |
1297 | } | |
1298 | ||
1299 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1300 | ||
1301 | { | |
1302 | struct gpio_chip **r = res; | |
1303 | ||
1304 | if (!r || !*r) { | |
1305 | WARN_ON(!r || !*r); | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | return *r == data; | |
1310 | } | |
1311 | ||
1312 | /** | |
1313 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
1314 | * @dev: the device pointer on which irq_chip belongs to. | |
1315 | * @chip: the chip to register, with chip->base initialized | |
1316 | * Context: potentially before irqs will work | |
1317 | * | |
1318 | * Returns a negative errno if the chip can't be registered, such as | |
1319 | * because the chip->base is invalid or already associated with a | |
1320 | * different chip. Otherwise it returns zero as a success code. | |
1321 | * | |
1322 | * The gpio chip automatically be released when the device is unbound. | |
1323 | */ | |
1324 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1325 | void *data) | |
1326 | { | |
1327 | struct gpio_chip **ptr; | |
1328 | int ret; | |
1329 | ||
1330 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1331 | GFP_KERNEL); | |
1332 | if (!ptr) | |
1333 | return -ENOMEM; | |
1334 | ||
1335 | ret = gpiochip_add_data(chip, data); | |
1336 | if (ret < 0) { | |
1337 | devres_free(ptr); | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | *ptr = chip; | |
1342 | devres_add(dev, ptr); | |
1343 | ||
1344 | return 0; | |
1345 | } | |
1346 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1347 | ||
1348 | /** | |
1349 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1350 | * @dev: device for which which resource was allocated | |
1351 | * @chip: the chip to remove | |
1352 | * | |
1353 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1354 | */ | |
1355 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1356 | { | |
1357 | int ret; | |
1358 | ||
1359 | ret = devres_release(dev, devm_gpio_chip_release, | |
1360 | devm_gpio_chip_match, chip); | |
1361 | if (!ret) | |
1362 | WARN_ON(ret); | |
1363 | } | |
1364 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1365 | ||
594fa265 GL |
1366 | /** |
1367 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1368 | * @data: data to pass to match function | |
1369 | * @callback: Callback function to check gpio_chip | |
1370 | * | |
1371 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1372 | * determined by a user supplied @match callback. The callback should return | |
1373 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1374 | * non-zero, this function will return to the caller and not iterate over any | |
1375 | * more gpio_chips. | |
1376 | */ | |
07ce8ec7 | 1377 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1378 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1379 | void *data)) |
594fa265 | 1380 | { |
ff2b1359 | 1381 | struct gpio_device *gdev; |
acf06ff7 | 1382 | struct gpio_chip *chip = NULL; |
594fa265 | 1383 | unsigned long flags; |
594fa265 GL |
1384 | |
1385 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1386 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1387 | if (gdev->chip && match(gdev->chip, data)) { |
1388 | chip = gdev->chip; | |
594fa265 | 1389 | break; |
acf06ff7 | 1390 | } |
ff2b1359 | 1391 | |
594fa265 GL |
1392 | spin_unlock_irqrestore(&gpio_lock, flags); |
1393 | ||
1394 | return chip; | |
1395 | } | |
8fa0c9bf | 1396 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1397 | |
79697ef9 AC |
1398 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1399 | { | |
1400 | const char *name = data; | |
1401 | ||
1402 | return !strcmp(chip->label, name); | |
1403 | } | |
1404 | ||
1405 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1406 | { | |
1407 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1408 | } | |
1409 | ||
14250520 LW |
1410 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1411 | ||
1412 | /* | |
1413 | * The following is irqchip helper code for gpiochips. | |
1414 | */ | |
1415 | ||
79b804cb MW |
1416 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1417 | { | |
1418 | int i; | |
1419 | ||
1420 | if (!gpiochip->irq_need_valid_mask) | |
1421 | return 0; | |
1422 | ||
1423 | gpiochip->irq_valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio), | |
1424 | sizeof(long), GFP_KERNEL); | |
1425 | if (!gpiochip->irq_valid_mask) | |
1426 | return -ENOMEM; | |
1427 | ||
1428 | /* Assume by default all GPIOs are valid */ | |
1429 | for (i = 0; i < gpiochip->ngpio; i++) | |
1430 | set_bit(i, gpiochip->irq_valid_mask); | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1436 | { | |
1437 | kfree(gpiochip->irq_valid_mask); | |
1438 | gpiochip->irq_valid_mask = NULL; | |
1439 | } | |
1440 | ||
1441 | static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, | |
1442 | unsigned int offset) | |
1443 | { | |
1444 | /* No mask means all valid */ | |
1445 | if (likely(!gpiochip->irq_valid_mask)) | |
1446 | return true; | |
1447 | return test_bit(offset, gpiochip->irq_valid_mask); | |
1448 | } | |
1449 | ||
14250520 | 1450 | /** |
3f97d5fc LW |
1451 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
1452 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1453 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1454 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1455 | * chained irqchip | |
1456 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1457 | * coming out of the gpiochip. If the interrupt is nested rather than |
1458 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
1459 | */ |
1460 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1461 | struct irq_chip *irqchip, | |
1462 | int parent_irq, | |
1463 | irq_flow_handler_t parent_handler) | |
1464 | { | |
83141a77 LW |
1465 | unsigned int offset; |
1466 | ||
83141a77 LW |
1467 | if (!gpiochip->irqdomain) { |
1468 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
1469 | __func__); | |
1c8732bb LW |
1470 | return; |
1471 | } | |
1472 | ||
3f97d5fc LW |
1473 | if (parent_handler) { |
1474 | if (gpiochip->can_sleep) { | |
1475 | chip_err(gpiochip, | |
1476 | "you cannot have chained interrupts on a " | |
1477 | "chip that may sleep\n"); | |
1478 | return; | |
1479 | } | |
3f97d5fc LW |
1480 | /* |
1481 | * The parent irqchip is already using the chip_data for this | |
1482 | * irqchip, so our callbacks simply use the handler_data. | |
1483 | */ | |
f7f87753 TG |
1484 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1485 | gpiochip); | |
25e4fe92 DES |
1486 | |
1487 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 1488 | } |
83141a77 LW |
1489 | |
1490 | /* Set the parent IRQ for all affected IRQs */ | |
79b804cb MW |
1491 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1492 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1493 | continue; | |
83141a77 LW |
1494 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), |
1495 | parent_irq); | |
79b804cb | 1496 | } |
14250520 LW |
1497 | } |
1498 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
1499 | ||
1500 | /** | |
1501 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1502 | * @d: the irqdomain used by this irqchip | |
1503 | * @irq: the global irq number used by this GPIO irqchip irq | |
1504 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1505 | * | |
1506 | * This function will set up the mapping for a certain IRQ line on a | |
1507 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1508 | * stored inside the gpiochip. | |
1509 | */ | |
1510 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
1511 | irq_hw_number_t hwirq) | |
1512 | { | |
1513 | struct gpio_chip *chip = d->host_data; | |
1514 | ||
14250520 | 1515 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1516 | /* |
1517 | * This lock class tells lockdep that GPIO irqs are in a different | |
1518 | * category than their parents, so it won't report false recursion. | |
1519 | */ | |
1520 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 1521 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 1522 | /* Chips that can sleep need nested thread handlers */ |
295494af | 1523 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 1524 | irq_set_nested_thread(irq, 1); |
14250520 | 1525 | irq_set_noprobe(irq); |
23393d49 | 1526 | |
1333b90f LW |
1527 | /* |
1528 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1529 | * is passed as default type. | |
1530 | */ | |
1531 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
1532 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
1533 | |
1534 | return 0; | |
1535 | } | |
1536 | ||
c3626fde LW |
1537 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
1538 | { | |
1c8732bb LW |
1539 | struct gpio_chip *chip = d->host_data; |
1540 | ||
1c8732bb LW |
1541 | if (chip->can_sleep) |
1542 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
1543 | irq_set_chip_and_handler(irq, NULL, NULL); |
1544 | irq_set_chip_data(irq, NULL); | |
1545 | } | |
1546 | ||
14250520 LW |
1547 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1548 | .map = gpiochip_irq_map, | |
c3626fde | 1549 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1550 | /* Virtually all GPIO irqchips are twocell:ed */ |
1551 | .xlate = irq_domain_xlate_twocell, | |
1552 | }; | |
1553 | ||
1554 | static int gpiochip_irq_reqres(struct irq_data *d) | |
1555 | { | |
1556 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1557 | ||
ff2b1359 | 1558 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1559 | return -ENODEV; |
1560 | ||
e3a2e878 | 1561 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1562 | chip_err(chip, |
1563 | "unable to lock HW IRQ %lu for IRQ\n", | |
1564 | d->hwirq); | |
ff2b1359 | 1565 | module_put(chip->gpiodev->owner); |
14250520 LW |
1566 | return -EINVAL; |
1567 | } | |
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | static void gpiochip_irq_relres(struct irq_data *d) | |
1572 | { | |
1573 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1574 | ||
e3a2e878 | 1575 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1576 | module_put(chip->gpiodev->owner); |
14250520 LW |
1577 | } |
1578 | ||
1579 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1580 | { | |
1581 | return irq_find_mapping(chip->irqdomain, offset); | |
1582 | } | |
1583 | ||
1584 | /** | |
1585 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1586 | * @gpiochip: the gpiochip to remove the irqchip from | |
1587 | * | |
1588 | * This is called only from gpiochip_remove() | |
1589 | */ | |
1590 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1591 | { | |
c3626fde LW |
1592 | unsigned int offset; |
1593 | ||
afa82fab MW |
1594 | acpi_gpiochip_free_interrupts(gpiochip); |
1595 | ||
25e4fe92 DES |
1596 | if (gpiochip->irq_parent) { |
1597 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
1598 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
1599 | } | |
1600 | ||
c3626fde LW |
1601 | /* Remove all IRQ mappings and delete the domain */ |
1602 | if (gpiochip->irqdomain) { | |
79b804cb MW |
1603 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1604 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1605 | continue; | |
e3893386 GS |
1606 | irq_dispose_mapping( |
1607 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
79b804cb | 1608 | } |
14250520 | 1609 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 1610 | } |
14250520 LW |
1611 | |
1612 | if (gpiochip->irqchip) { | |
1613 | gpiochip->irqchip->irq_request_resources = NULL; | |
1614 | gpiochip->irqchip->irq_release_resources = NULL; | |
1615 | gpiochip->irqchip = NULL; | |
1616 | } | |
79b804cb MW |
1617 | |
1618 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
1619 | } |
1620 | ||
1621 | /** | |
1622 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
1623 | * @gpiochip: the gpiochip to add the irqchip to | |
1624 | * @irqchip: the irqchip to add to the gpiochip | |
1625 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1626 | * allocate gpiochip irqs from | |
1627 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1628 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1629 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 1630 | * @lock_key: lockdep class |
14250520 LW |
1631 | * |
1632 | * This function closely associates a certain irqchip with a certain | |
1633 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1634 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1635 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1636 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1637 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1638 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1639 | * translation. The gpiochip will need to be initialized and registered | |
1640 | * before calling this function. | |
1641 | * | |
c3626fde LW |
1642 | * This function will handle two cell:ed simple IRQs and assumes all |
1643 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1644 | * need to be open coded. |
1645 | */ | |
a0a8bcf4 GS |
1646 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
1647 | struct irq_chip *irqchip, | |
1648 | unsigned int first_irq, | |
1649 | irq_flow_handler_t handler, | |
1650 | unsigned int type, | |
1651 | struct lock_class_key *lock_key) | |
14250520 LW |
1652 | { |
1653 | struct device_node *of_node; | |
79b804cb | 1654 | bool irq_base_set = false; |
14250520 | 1655 | unsigned int offset; |
c3626fde | 1656 | unsigned irq_base = 0; |
14250520 LW |
1657 | |
1658 | if (!gpiochip || !irqchip) | |
1659 | return -EINVAL; | |
1660 | ||
58383c78 | 1661 | if (!gpiochip->parent) { |
14250520 LW |
1662 | pr_err("missing gpiochip .dev parent pointer\n"); |
1663 | return -EINVAL; | |
1664 | } | |
58383c78 | 1665 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1666 | #ifdef CONFIG_OF_GPIO |
1667 | /* | |
20a8a968 | 1668 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1669 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1670 | * everywhere | |
14250520 LW |
1671 | */ |
1672 | if (gpiochip->of_node) | |
1673 | of_node = gpiochip->of_node; | |
1674 | #endif | |
332e99d5 | 1675 | /* |
0a1e0053 | 1676 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
1677 | * used to configure the interrupts, as you may end-up with |
1678 | * conflicting triggers. Tell the user, and reset to NONE. | |
1679 | */ | |
1680 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
1681 | "%s: Ignoring %d default trigger\n", of_node->full_name, type)) | |
1682 | type = IRQ_TYPE_NONE; | |
0a1e0053 MW |
1683 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
1684 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1685 | "Ignoring %d default trigger\n", type); | |
1686 | type = IRQ_TYPE_NONE; | |
1687 | } | |
332e99d5 | 1688 | |
14250520 LW |
1689 | gpiochip->irqchip = irqchip; |
1690 | gpiochip->irq_handler = handler; | |
1691 | gpiochip->irq_default_type = type; | |
1692 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 1693 | gpiochip->lock_key = lock_key; |
14250520 LW |
1694 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1695 | gpiochip->ngpio, first_irq, | |
1696 | &gpiochip_domain_ops, gpiochip); | |
1697 | if (!gpiochip->irqdomain) { | |
1698 | gpiochip->irqchip = NULL; | |
1699 | return -EINVAL; | |
1700 | } | |
8b67a1f0 RV |
1701 | |
1702 | /* | |
1703 | * It is possible for a driver to override this, but only if the | |
1704 | * alternative functions are both implemented. | |
1705 | */ | |
1706 | if (!irqchip->irq_request_resources && | |
1707 | !irqchip->irq_release_resources) { | |
1708 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1709 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1710 | } | |
14250520 LW |
1711 | |
1712 | /* | |
1713 | * Prepare the mapping since the irqchip shall be orthogonal to | |
1714 | * any gpiochip calls. If the first_irq was zero, this is | |
1715 | * necessary to allocate descriptors for all IRQs. | |
1716 | */ | |
c3626fde | 1717 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
79b804cb MW |
1718 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) |
1719 | continue; | |
c3626fde | 1720 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); |
79b804cb | 1721 | if (!irq_base_set) { |
c3626fde LW |
1722 | /* |
1723 | * Store the base into the gpiochip to be used when | |
1724 | * unmapping the irqs. | |
1725 | */ | |
1726 | gpiochip->irq_base = irq_base; | |
79b804cb MW |
1727 | irq_base_set = true; |
1728 | } | |
c3626fde | 1729 | } |
14250520 | 1730 | |
afa82fab MW |
1731 | acpi_gpiochip_request_interrupts(gpiochip); |
1732 | ||
14250520 LW |
1733 | return 0; |
1734 | } | |
a0a8bcf4 | 1735 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
1736 | |
1737 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1738 | ||
1739 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
79b804cb MW |
1740 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1741 | { | |
1742 | return 0; | |
1743 | } | |
1744 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1745 | { } | |
14250520 LW |
1746 | |
1747 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1748 | ||
c771c2f4 JG |
1749 | /** |
1750 | * gpiochip_generic_request() - request the gpio function for a pin | |
1751 | * @chip: the gpiochip owning the GPIO | |
1752 | * @offset: the offset of the GPIO to request for GPIO function | |
1753 | */ | |
1754 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1755 | { | |
fdeb8e15 | 1756 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1757 | } |
1758 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1759 | ||
1760 | /** | |
1761 | * gpiochip_generic_free() - free the gpio function from a pin | |
1762 | * @chip: the gpiochip to request the gpio function for | |
1763 | * @offset: the offset of the GPIO to free from GPIO function | |
1764 | */ | |
1765 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1766 | { | |
fdeb8e15 | 1767 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1768 | } |
1769 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1770 | ||
f23f1516 | 1771 | #ifdef CONFIG_PINCTRL |
165adc9c | 1772 | |
586a87e6 CR |
1773 | /** |
1774 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1775 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1776 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1777 | * @gpio_offset: the start offset in the current gpio_chip number space |
1778 | * @pin_group: name of the pin group inside the pin controller | |
1779 | */ | |
1780 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1781 | struct pinctrl_dev *pctldev, | |
1782 | unsigned int gpio_offset, const char *pin_group) | |
1783 | { | |
1784 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1785 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1786 | int ret; |
1787 | ||
1788 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1789 | if (!pin_range) { | |
1a2a99c6 | 1790 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1791 | return -ENOMEM; |
1792 | } | |
1793 | ||
1794 | /* Use local offset as range ID */ | |
1795 | pin_range->range.id = gpio_offset; | |
1796 | pin_range->range.gc = chip; | |
1797 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1798 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1799 | pin_range->pctldev = pctldev; |
1800 | ||
1801 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1802 | &pin_range->range.pins, | |
1803 | &pin_range->range.npins); | |
61c6375d MN |
1804 | if (ret < 0) { |
1805 | kfree(pin_range); | |
586a87e6 | 1806 | return ret; |
61c6375d | 1807 | } |
586a87e6 CR |
1808 | |
1809 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1810 | ||
1a2a99c6 AS |
1811 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1812 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1813 | pinctrl_dev_get_devname(pctldev), pin_group); |
1814 | ||
20ec3e39 | 1815 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1816 | |
1817 | return 0; | |
1818 | } | |
1819 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1820 | ||
3f0f8670 LW |
1821 | /** |
1822 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1823 | * @chip: the gpiochip to add the range for | |
1824 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1825 | * @gpio_offset: the start offset in the current gpio_chip number space |
1826 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1827 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1828 | * pin controller) to accumulate in this range | |
1829 | */ | |
1e63d7b9 | 1830 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1831 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1832 | unsigned int npins) |
f23f1516 SH |
1833 | { |
1834 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1835 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1836 | int ret; |
f23f1516 | 1837 | |
3f0f8670 | 1838 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1839 | if (!pin_range) { |
1a2a99c6 | 1840 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1841 | return -ENOMEM; |
f23f1516 SH |
1842 | } |
1843 | ||
3f0f8670 | 1844 | /* Use local offset as range ID */ |
316511c0 | 1845 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1846 | pin_range->range.gc = chip; |
f23f1516 | 1847 | pin_range->range.name = chip->label; |
fdeb8e15 | 1848 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1849 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1850 | pin_range->range.npins = npins; |
192c369c | 1851 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1852 | &pin_range->range); |
8f23ca1a | 1853 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1854 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1855 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1856 | kfree(pin_range); |
b4d4b1f0 | 1857 | return ret; |
3f0f8670 | 1858 | } |
1a2a99c6 AS |
1859 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1860 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1861 | pinctl_name, |
1862 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1863 | |
20ec3e39 | 1864 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1865 | |
1866 | return 0; | |
f23f1516 | 1867 | } |
165adc9c | 1868 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1869 | |
3f0f8670 LW |
1870 | /** |
1871 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1872 | * @chip: the chip to remove all the mappings for | |
1873 | */ | |
f23f1516 SH |
1874 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1875 | { | |
1876 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1877 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1878 | |
20ec3e39 | 1879 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1880 | list_del(&pin_range->node); |
1881 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1882 | &pin_range->range); | |
3f0f8670 | 1883 | kfree(pin_range); |
f23f1516 SH |
1884 | } |
1885 | } | |
165adc9c LW |
1886 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1887 | ||
1888 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1889 | |
d2876d08 DB |
1890 | /* These "optional" allocation calls help prevent drivers from stomping |
1891 | * on each other, and help provide better diagnostics in debugfs. | |
1892 | * They're called even less than the "set direction" calls. | |
1893 | */ | |
77c2d792 | 1894 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1895 | { |
fdeb8e15 | 1896 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1897 | int status; |
d2876d08 DB |
1898 | unsigned long flags; |
1899 | ||
bcabdef1 AC |
1900 | spin_lock_irqsave(&gpio_lock, flags); |
1901 | ||
d2876d08 | 1902 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1903 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1904 | */ |
1905 | ||
1906 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1907 | desc_set_label(desc, label ? : "?"); | |
1908 | status = 0; | |
438d8908 | 1909 | } else { |
d2876d08 | 1910 | status = -EBUSY; |
7460db56 | 1911 | goto done; |
35e8bb51 DB |
1912 | } |
1913 | ||
1914 | if (chip->request) { | |
1915 | /* chip->request may sleep */ | |
1916 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1917 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1918 | spin_lock_irqsave(&gpio_lock, flags); |
1919 | ||
1920 | if (status < 0) { | |
1921 | desc_set_label(desc, NULL); | |
35e8bb51 | 1922 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1923 | goto done; |
35e8bb51 | 1924 | } |
438d8908 | 1925 | } |
80b0a602 MN |
1926 | if (chip->get_direction) { |
1927 | /* chip->get_direction may sleep */ | |
1928 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1929 | gpiod_get_direction(desc); |
80b0a602 MN |
1930 | spin_lock_irqsave(&gpio_lock, flags); |
1931 | } | |
77c2d792 MW |
1932 | done: |
1933 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1934 | return status; | |
1935 | } | |
1936 | ||
fdeb8e15 LW |
1937 | /* |
1938 | * This descriptor validation needs to be inserted verbatim into each | |
1939 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
1940 | * macro to avoid endless duplication. If the desc is NULL it is an |
1941 | * optional GPIO and calls should just bail out. | |
fdeb8e15 LW |
1942 | */ |
1943 | #define VALIDATE_DESC(desc) do { \ | |
54d77198 LW |
1944 | if (!desc) \ |
1945 | return 0; \ | |
bfbbe44d LW |
1946 | if (IS_ERR(desc)) { \ |
1947 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1948 | return PTR_ERR(desc); \ | |
1949 | } \ | |
54d77198 | 1950 | if (!desc->gdev) { \ |
bfbbe44d | 1951 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1952 | return -EINVAL; \ |
1953 | } \ | |
1954 | if ( !desc->gdev->chip ) { \ | |
1955 | dev_warn(&desc->gdev->dev, \ | |
1956 | "%s: backing chip is gone\n", __func__); \ | |
1957 | return 0; \ | |
1958 | } } while (0) | |
1959 | ||
1960 | #define VALIDATE_DESC_VOID(desc) do { \ | |
54d77198 LW |
1961 | if (!desc) \ |
1962 | return; \ | |
bfbbe44d LW |
1963 | if (IS_ERR(desc)) { \ |
1964 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1965 | return; \ | |
1966 | } \ | |
54d77198 | 1967 | if (!desc->gdev) { \ |
bfbbe44d | 1968 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1969 | return; \ |
1970 | } \ | |
1971 | if (!desc->gdev->chip) { \ | |
1972 | dev_warn(&desc->gdev->dev, \ | |
1973 | "%s: backing chip is gone\n", __func__); \ | |
1974 | return; \ | |
1975 | } } while (0) | |
1976 | ||
1977 | ||
0eb4c6c2 | 1978 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1979 | { |
1980 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1981 | struct gpio_device *gdev; |
77c2d792 | 1982 | |
fdeb8e15 LW |
1983 | VALIDATE_DESC(desc); |
1984 | gdev = desc->gdev; | |
77c2d792 | 1985 | |
fdeb8e15 | 1986 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1987 | status = __gpiod_request(desc, label); |
1988 | if (status < 0) | |
fdeb8e15 | 1989 | module_put(gdev->owner); |
33a68e86 LW |
1990 | else |
1991 | get_device(&gdev->dev); | |
77c2d792 MW |
1992 | } |
1993 | ||
d2876d08 | 1994 | if (status) |
7589e59f | 1995 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 1996 | |
d2876d08 DB |
1997 | return status; |
1998 | } | |
372e722e | 1999 | |
77c2d792 | 2000 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 2001 | { |
77c2d792 | 2002 | bool ret = false; |
d2876d08 | 2003 | unsigned long flags; |
35e8bb51 | 2004 | struct gpio_chip *chip; |
d2876d08 | 2005 | |
3d599d1c UKK |
2006 | might_sleep(); |
2007 | ||
372e722e | 2008 | gpiod_unexport(desc); |
d8f388d8 | 2009 | |
d2876d08 DB |
2010 | spin_lock_irqsave(&gpio_lock, flags); |
2011 | ||
fdeb8e15 | 2012 | chip = desc->gdev->chip; |
35e8bb51 DB |
2013 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2014 | if (chip->free) { | |
2015 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2016 | might_sleep_if(chip->can_sleep); |
372e722e | 2017 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2018 | spin_lock_irqsave(&gpio_lock, flags); |
2019 | } | |
d2876d08 | 2020 | desc_set_label(desc, NULL); |
07697461 | 2021 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2022 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2023 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2024 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2025 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2026 | ret = true; |
2027 | } | |
d2876d08 DB |
2028 | |
2029 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2030 | return ret; |
2031 | } | |
2032 | ||
0eb4c6c2 | 2033 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2034 | { |
33a68e86 | 2035 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 2036 | module_put(desc->gdev->owner); |
33a68e86 LW |
2037 | put_device(&desc->gdev->dev); |
2038 | } else { | |
77c2d792 | 2039 | WARN_ON(extra_checks); |
33a68e86 | 2040 | } |
d2876d08 | 2041 | } |
372e722e | 2042 | |
d2876d08 DB |
2043 | /** |
2044 | * gpiochip_is_requested - return string iff signal was requested | |
2045 | * @chip: controller managing the signal | |
2046 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2047 | * | |
2048 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2049 | * The string returned is the label passed to gpio_request(); if none has been |
2050 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2051 | * |
2052 | * This function is for use by GPIO controller drivers. The label can | |
2053 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2054 | * can help avoid accidentally multiplexing it to another controller. | |
2055 | */ | |
2056 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2057 | { | |
6c0b4e6c | 2058 | struct gpio_desc *desc; |
d2876d08 | 2059 | |
48b5953e | 2060 | if (offset >= chip->ngpio) |
d2876d08 | 2061 | return NULL; |
6c0b4e6c | 2062 | |
1c3cdb18 | 2063 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2064 | |
372e722e | 2065 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2066 | return NULL; |
372e722e | 2067 | return desc->label; |
d2876d08 DB |
2068 | } |
2069 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2070 | ||
77c2d792 MW |
2071 | /** |
2072 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
2073 | * @desc: GPIO descriptor to request | |
2074 | * @label: label for the GPIO | |
2075 | * | |
2076 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2077 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2078 | * function will not increase reference count of the GPIO chip module. This | |
2079 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2080 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
2081 | */ | |
abdc08a3 AC |
2082 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2083 | const char *label) | |
77c2d792 | 2084 | { |
abdc08a3 AC |
2085 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2086 | int err; | |
77c2d792 | 2087 | |
abdc08a3 AC |
2088 | if (IS_ERR(desc)) { |
2089 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2090 | return desc; | |
2091 | } | |
2092 | ||
2093 | err = __gpiod_request(desc, label); | |
2094 | if (err < 0) | |
2095 | return ERR_PTR(err); | |
77c2d792 | 2096 | |
abdc08a3 | 2097 | return desc; |
77c2d792 | 2098 | } |
f7d4ad98 | 2099 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2100 | |
2101 | /** | |
2102 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2103 | * @desc: GPIO descriptor to free | |
2104 | * | |
2105 | * Function frees the given GPIO requested previously with | |
2106 | * gpiochip_request_own_desc(). | |
2107 | */ | |
2108 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2109 | { | |
2110 | if (desc) | |
2111 | __gpiod_free(desc); | |
2112 | } | |
f7d4ad98 | 2113 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2114 | |
fdeb8e15 LW |
2115 | /* |
2116 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2117 | * some cases this is done in early boot, before IRQs are enabled. |
2118 | * | |
2119 | * As a rule these aren't called more than once (except for drivers | |
2120 | * using the open-drain emulation idiom) so these are natural places | |
2121 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2122 | * rely on gpio_request() having been called beforehand. | |
2123 | */ | |
2124 | ||
79a9becd AC |
2125 | /** |
2126 | * gpiod_direction_input - set the GPIO direction to input | |
2127 | * @desc: GPIO to set to input | |
2128 | * | |
2129 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2130 | * be called safely on it. | |
2131 | * | |
2132 | * Return 0 in case of success, else an error code. | |
2133 | */ | |
2134 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2135 | { |
d2876d08 | 2136 | struct gpio_chip *chip; |
d2876d08 DB |
2137 | int status = -EINVAL; |
2138 | ||
fdeb8e15 LW |
2139 | VALIDATE_DESC(desc); |
2140 | chip = desc->gdev->chip; | |
bcabdef1 | 2141 | |
be1a4b13 | 2142 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2143 | gpiod_warn(desc, |
2144 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2145 | __func__); |
be1a4b13 LW |
2146 | return -EIO; |
2147 | } | |
2148 | ||
d82da797 | 2149 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2150 | if (status == 0) |
2151 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2152 | |
372e722e | 2153 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2154 | |
d2876d08 DB |
2155 | return status; |
2156 | } | |
79a9becd | 2157 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2158 | |
ef70bbe1 | 2159 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 2160 | { |
c663e5f5 LW |
2161 | struct gpio_chip *gc = desc->gdev->chip; |
2162 | int ret; | |
d2876d08 | 2163 | |
d468bf9e LW |
2164 | /* GPIOs used for IRQs shall not be set as output */ |
2165 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
2166 | gpiod_err(desc, | |
2167 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2168 | __func__); | |
2169 | return -EIO; | |
2170 | } | |
2171 | ||
c663e5f5 LW |
2172 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2173 | /* First see if we can enable open drain in hardware */ | |
2174 | if (gc->set_single_ended) { | |
2175 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
2176 | LINE_MODE_OPEN_DRAIN); | |
2177 | if (!ret) | |
2178 | goto set_output_value; | |
2179 | } | |
2180 | /* Emulate open drain by not actively driving the line high */ | |
2181 | if (value) | |
2182 | return gpiod_direction_input(desc); | |
2183 | } | |
2184 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2185 | if (gc->set_single_ended) { | |
2186 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
2187 | LINE_MODE_OPEN_SOURCE); | |
2188 | if (!ret) | |
2189 | goto set_output_value; | |
2190 | } | |
2191 | /* Emulate open source by not actively driving the line low */ | |
2192 | if (!value) | |
2193 | return gpiod_direction_input(desc); | |
2194 | } else { | |
2195 | /* Make sure to disable open drain/source hardware, if any */ | |
2196 | if (gc->set_single_ended) | |
2197 | gc->set_single_ended(gc, | |
2198 | gpio_chip_hwgpio(desc), | |
2199 | LINE_MODE_PUSH_PULL); | |
2200 | } | |
25553ff0 | 2201 | |
c663e5f5 LW |
2202 | set_output_value: |
2203 | if (!gc->set || !gc->direction_output) { | |
6424de5a MB |
2204 | gpiod_warn(desc, |
2205 | "%s: missing set() or direction_output() operations\n", | |
2206 | __func__); | |
be1a4b13 LW |
2207 | return -EIO; |
2208 | } | |
2209 | ||
c663e5f5 LW |
2210 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), value); |
2211 | if (!ret) | |
d2876d08 | 2212 | set_bit(FLAG_IS_OUT, &desc->flags); |
372e722e | 2213 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
c663e5f5 LW |
2214 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2215 | return ret; | |
d2876d08 | 2216 | } |
ef70bbe1 PZ |
2217 | |
2218 | /** | |
2219 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2220 | * @desc: GPIO to set to output | |
2221 | * @value: initial output value of the GPIO | |
2222 | * | |
2223 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2224 | * be called safely on it. The initial value of the output must be specified | |
2225 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2226 | * | |
2227 | * Return 0 in case of success, else an error code. | |
2228 | */ | |
2229 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2230 | { | |
fdeb8e15 | 2231 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2232 | return _gpiod_direction_output_raw(desc, value); |
2233 | } | |
2234 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2235 | ||
2236 | /** | |
90df4fe0 | 2237 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2238 | * @desc: GPIO to set to output |
2239 | * @value: initial output value of the GPIO | |
2240 | * | |
2241 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2242 | * be called safely on it. The initial value of the output must be specified | |
2243 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2244 | * account. | |
2245 | * | |
2246 | * Return 0 in case of success, else an error code. | |
2247 | */ | |
2248 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2249 | { | |
fdeb8e15 | 2250 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2251 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2252 | value = !value; | |
2253 | return _gpiod_direction_output_raw(desc, value); | |
2254 | } | |
79a9becd | 2255 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2256 | |
c4b5be98 | 2257 | /** |
79a9becd | 2258 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
2259 | * @gpio: the gpio to set debounce time |
2260 | * @debounce: debounce time is microseconds | |
65d87656 LW |
2261 | * |
2262 | * returns -ENOTSUPP if the controller does not support setting | |
2263 | * debounce. | |
c4b5be98 | 2264 | */ |
79a9becd | 2265 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2266 | { |
c4b5be98 | 2267 | struct gpio_chip *chip; |
c4b5be98 | 2268 | |
fdeb8e15 LW |
2269 | VALIDATE_DESC(desc); |
2270 | chip = desc->gdev->chip; | |
be1a4b13 | 2271 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
2272 | gpiod_dbg(desc, |
2273 | "%s: missing set() or set_debounce() operations\n", | |
2274 | __func__); | |
65d87656 | 2275 | return -ENOTSUPP; |
be1a4b13 LW |
2276 | } |
2277 | ||
d82da797 | 2278 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 2279 | } |
79a9becd | 2280 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2281 | |
79a9becd AC |
2282 | /** |
2283 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2284 | * @desc: the gpio descriptor to test | |
2285 | * | |
2286 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2287 | */ | |
2288 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2289 | { |
fdeb8e15 | 2290 | VALIDATE_DESC(desc); |
79a9becd | 2291 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2292 | } |
79a9becd | 2293 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2294 | |
2295 | /* I/O calls are only valid after configuration completed; the relevant | |
2296 | * "is this a valid GPIO" error checks should already have been done. | |
2297 | * | |
2298 | * "Get" operations are often inlinable as reading a pin value register, | |
2299 | * and masking the relevant bit in that register. | |
2300 | * | |
2301 | * When "set" operations are inlinable, they involve writing that mask to | |
2302 | * one register to set a low value, or a different register to set it high. | |
2303 | * Otherwise locking is needed, so there may be little value to inlining. | |
2304 | * | |
2305 | *------------------------------------------------------------------------ | |
2306 | * | |
2307 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2308 | * have requested the GPIO. That can include implicit requesting by | |
2309 | * a direction setting call. Marking a gpio as requested locks its chip | |
2310 | * in memory, guaranteeing that these table lookups need no more locking | |
2311 | * and that gpiochip_remove() will fail. | |
2312 | * | |
2313 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2314 | * that the GPIO was actually requested. | |
2315 | */ | |
2316 | ||
e20538b8 | 2317 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
2318 | { |
2319 | struct gpio_chip *chip; | |
372e722e | 2320 | int offset; |
e20538b8 | 2321 | int value; |
d2876d08 | 2322 | |
fdeb8e15 | 2323 | chip = desc->gdev->chip; |
372e722e | 2324 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2325 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2326 | value = value < 0 ? value : !!value; |
372e722e | 2327 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2328 | return value; |
d2876d08 | 2329 | } |
372e722e | 2330 | |
d2876d08 | 2331 | /** |
79a9becd AC |
2332 | * gpiod_get_raw_value() - return a gpio's raw value |
2333 | * @desc: gpio whose value will be returned | |
d2876d08 | 2334 | * |
79a9becd | 2335 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2336 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2337 | * |
2338 | * This function should be called from contexts where we cannot sleep, and will | |
2339 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2340 | */ |
79a9becd | 2341 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2342 | { |
fdeb8e15 | 2343 | VALIDATE_DESC(desc); |
e4e449e8 | 2344 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2345 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2346 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2347 | } |
79a9becd | 2348 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2349 | |
79a9becd AC |
2350 | /** |
2351 | * gpiod_get_value() - return a gpio's value | |
2352 | * @desc: gpio whose value will be returned | |
2353 | * | |
2354 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2355 | * account, or negative errno on failure. |
79a9becd AC |
2356 | * |
2357 | * This function should be called from contexts where we cannot sleep, and will | |
2358 | * complain if the GPIO chip functions potentially sleep. | |
2359 | */ | |
2360 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2361 | { |
79a9becd | 2362 | int value; |
fdeb8e15 LW |
2363 | |
2364 | VALIDATE_DESC(desc); | |
79a9becd | 2365 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2366 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2367 | |
2368 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
2369 | if (value < 0) |
2370 | return value; | |
2371 | ||
79a9becd AC |
2372 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2373 | value = !value; | |
2374 | ||
2375 | return value; | |
372e722e | 2376 | } |
79a9becd | 2377 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2378 | |
aca5ce14 LD |
2379 | /* |
2380 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 2381 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 2382 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 2383 | */ |
23600969 | 2384 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
2385 | { |
2386 | int err = 0; | |
fdeb8e15 | 2387 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2388 | int offset = gpio_chip_hwgpio(desc); |
2389 | ||
aca5ce14 | 2390 | if (value) { |
372e722e | 2391 | err = chip->direction_input(chip, offset); |
aca5ce14 | 2392 | if (!err) |
372e722e | 2393 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2394 | } else { |
372e722e | 2395 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 2396 | if (!err) |
372e722e | 2397 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2398 | } |
372e722e | 2399 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 2400 | if (err < 0) |
6424de5a MB |
2401 | gpiod_err(desc, |
2402 | "%s: Error in set_value for open drain err %d\n", | |
2403 | __func__, err); | |
aca5ce14 LD |
2404 | } |
2405 | ||
25553ff0 | 2406 | /* |
79a9becd AC |
2407 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
2408 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 2409 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 2410 | */ |
23600969 | 2411 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
2412 | { |
2413 | int err = 0; | |
fdeb8e15 | 2414 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2415 | int offset = gpio_chip_hwgpio(desc); |
2416 | ||
25553ff0 | 2417 | if (value) { |
372e722e | 2418 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 2419 | if (!err) |
372e722e | 2420 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2421 | } else { |
372e722e | 2422 | err = chip->direction_input(chip, offset); |
25553ff0 | 2423 | if (!err) |
372e722e | 2424 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2425 | } |
372e722e | 2426 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 2427 | if (err < 0) |
6424de5a MB |
2428 | gpiod_err(desc, |
2429 | "%s: Error in set_value for open source err %d\n", | |
2430 | __func__, err); | |
25553ff0 LD |
2431 | } |
2432 | ||
23600969 | 2433 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
2434 | { |
2435 | struct gpio_chip *chip; | |
2436 | ||
fdeb8e15 | 2437 | chip = desc->gdev->chip; |
372e722e AC |
2438 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
2439 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
2440 | _gpio_set_open_drain_value(desc, value); | |
2441 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
2442 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 2443 | else |
372e722e AC |
2444 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
2445 | } | |
2446 | ||
5f424243 RI |
2447 | /* |
2448 | * set multiple outputs on the same chip; | |
2449 | * use the chip's set_multiple function if available; | |
2450 | * otherwise set the outputs sequentially; | |
2451 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
2452 | * defines which outputs are to be changed | |
2453 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
2454 | * defines the values the outputs specified by mask are to be set to | |
2455 | */ | |
2456 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
2457 | unsigned long *mask, unsigned long *bits) | |
2458 | { | |
2459 | if (chip->set_multiple) { | |
2460 | chip->set_multiple(chip, mask, bits); | |
2461 | } else { | |
2462 | int i; | |
2463 | for (i = 0; i < chip->ngpio; i++) { | |
2464 | if (mask[BIT_WORD(i)] == 0) { | |
2465 | /* no more set bits in this mask word; | |
2466 | * skip ahead to the next word */ | |
2467 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
2468 | continue; | |
2469 | } | |
2470 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 2471 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 2472 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
2473 | } |
2474 | } | |
2475 | } | |
2476 | ||
44c7288f LW |
2477 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
2478 | unsigned int array_size, | |
2479 | struct gpio_desc **desc_array, | |
2480 | int *value_array) | |
5f424243 RI |
2481 | { |
2482 | int i = 0; | |
2483 | ||
2484 | while (i < array_size) { | |
fdeb8e15 | 2485 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
2486 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
2487 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
2488 | int count = 0; | |
2489 | ||
38e003f4 | 2490 | if (!can_sleep) |
5f424243 | 2491 | WARN_ON(chip->can_sleep); |
38e003f4 | 2492 | |
5f424243 RI |
2493 | memset(mask, 0, sizeof(mask)); |
2494 | do { | |
2495 | struct gpio_desc *desc = desc_array[i]; | |
2496 | int hwgpio = gpio_chip_hwgpio(desc); | |
2497 | int value = value_array[i]; | |
2498 | ||
2499 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2500 | value = !value; | |
2501 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
2502 | /* | |
2503 | * collect all normal outputs belonging to the same chip | |
2504 | * open drain and open source outputs are set individually | |
2505 | */ | |
2506 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 2507 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
2508 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
2509 | _gpio_set_open_source_value(desc, value); | |
2510 | } else { | |
2511 | __set_bit(hwgpio, mask); | |
38e003f4 | 2512 | if (value) |
5f424243 | 2513 | __set_bit(hwgpio, bits); |
38e003f4 | 2514 | else |
5f424243 | 2515 | __clear_bit(hwgpio, bits); |
5f424243 RI |
2516 | count++; |
2517 | } | |
2518 | i++; | |
fdeb8e15 LW |
2519 | } while ((i < array_size) && |
2520 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 2521 | /* push collected bits to outputs */ |
38e003f4 | 2522 | if (count != 0) |
5f424243 | 2523 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
2524 | } |
2525 | } | |
2526 | ||
d2876d08 | 2527 | /** |
79a9becd AC |
2528 | * gpiod_set_raw_value() - assign a gpio's raw value |
2529 | * @desc: gpio whose value will be assigned | |
d2876d08 | 2530 | * @value: value to assign |
d2876d08 | 2531 | * |
79a9becd AC |
2532 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
2533 | * regard for its ACTIVE_LOW status. | |
2534 | * | |
2535 | * This function should be called from contexts where we cannot sleep, and will | |
2536 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2537 | */ |
79a9becd | 2538 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 2539 | { |
fdeb8e15 | 2540 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2541 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2542 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2543 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 2544 | } |
79a9becd | 2545 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
2546 | |
2547 | /** | |
79a9becd AC |
2548 | * gpiod_set_value() - assign a gpio's value |
2549 | * @desc: gpio whose value will be assigned | |
2550 | * @value: value to assign | |
2551 | * | |
2552 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2553 | * account | |
d2876d08 | 2554 | * |
79a9becd AC |
2555 | * This function should be called from contexts where we cannot sleep, and will |
2556 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2557 | */ |
79a9becd | 2558 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 2559 | { |
fdeb8e15 | 2560 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2561 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2562 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2563 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2564 | value = !value; | |
2565 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2566 | } |
79a9becd | 2567 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 2568 | |
5f424243 | 2569 | /** |
3fff99bc | 2570 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2571 | * @array_size: number of elements in the descriptor / value arrays |
2572 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2573 | * @value_array: array of values to assign | |
2574 | * | |
2575 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2576 | * without regard for their ACTIVE_LOW status. | |
2577 | * | |
2578 | * This function should be called from contexts where we cannot sleep, and will | |
2579 | * complain if the GPIO chip functions potentially sleep. | |
2580 | */ | |
3fff99bc | 2581 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
2582 | struct gpio_desc **desc_array, int *value_array) |
2583 | { | |
2584 | if (!desc_array) | |
2585 | return; | |
44c7288f LW |
2586 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
2587 | value_array); | |
5f424243 | 2588 | } |
3fff99bc | 2589 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
2590 | |
2591 | /** | |
3fff99bc | 2592 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2593 | * @array_size: number of elements in the descriptor / value arrays |
2594 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2595 | * @value_array: array of values to assign | |
2596 | * | |
2597 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2598 | * into account. | |
2599 | * | |
2600 | * This function should be called from contexts where we cannot sleep, and will | |
2601 | * complain if the GPIO chip functions potentially sleep. | |
2602 | */ | |
3fff99bc RI |
2603 | void gpiod_set_array_value(unsigned int array_size, |
2604 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2605 | { |
2606 | if (!desc_array) | |
2607 | return; | |
44c7288f LW |
2608 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2609 | value_array); | |
5f424243 | 2610 | } |
3fff99bc | 2611 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2612 | |
d2876d08 | 2613 | /** |
79a9becd AC |
2614 | * gpiod_cansleep() - report whether gpio value access may sleep |
2615 | * @desc: gpio to check | |
d2876d08 | 2616 | * |
d2876d08 | 2617 | */ |
79a9becd | 2618 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2619 | { |
fdeb8e15 LW |
2620 | VALIDATE_DESC(desc); |
2621 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2622 | } |
79a9becd | 2623 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2624 | |
0f6d504e | 2625 | /** |
79a9becd AC |
2626 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2627 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2628 | * |
79a9becd AC |
2629 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2630 | * error. | |
0f6d504e | 2631 | */ |
79a9becd | 2632 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2633 | { |
4c37ce86 LW |
2634 | struct gpio_chip *chip; |
2635 | int offset; | |
0f6d504e | 2636 | |
79bb71bd LW |
2637 | /* |
2638 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
2639 | * requires this function to not return zero on an invalid descriptor | |
2640 | * but rather a negative error number. | |
2641 | */ | |
bfbbe44d | 2642 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
2643 | return -EINVAL; |
2644 | ||
fdeb8e15 | 2645 | chip = desc->gdev->chip; |
372e722e | 2646 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
2647 | if (chip->to_irq) { |
2648 | int retirq = chip->to_irq(chip, offset); | |
2649 | ||
2650 | /* Zero means NO_IRQ */ | |
2651 | if (!retirq) | |
2652 | return -ENXIO; | |
2653 | ||
2654 | return retirq; | |
2655 | } | |
2656 | return -ENXIO; | |
0f6d504e | 2657 | } |
79a9becd | 2658 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 2659 | |
d468bf9e | 2660 | /** |
e3a2e878 | 2661 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
2662 | * @chip: the chip the GPIO to lock belongs to |
2663 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2664 | * |
2665 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 2666 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 2667 | */ |
e3a2e878 | 2668 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 2669 | { |
9c10280d LW |
2670 | struct gpio_desc *desc; |
2671 | ||
2672 | desc = gpiochip_get_desc(chip, offset); | |
2673 | if (IS_ERR(desc)) | |
2674 | return PTR_ERR(desc); | |
2675 | ||
2676 | /* Flush direction if something changed behind our back */ | |
2677 | if (chip->get_direction) { | |
2678 | int dir = chip->get_direction(chip, offset); | |
2679 | ||
2680 | if (dir) | |
2681 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
2682 | else | |
2683 | set_bit(FLAG_IS_OUT, &desc->flags); | |
2684 | } | |
d468bf9e | 2685 | |
9c10280d | 2686 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 2687 | chip_err(chip, |
d468bf9e LW |
2688 | "%s: tried to flag a GPIO set as output for IRQ\n", |
2689 | __func__); | |
2690 | return -EIO; | |
2691 | } | |
2692 | ||
9c10280d | 2693 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
d468bf9e | 2694 | return 0; |
372e722e | 2695 | } |
e3a2e878 | 2696 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 2697 | |
d468bf9e | 2698 | /** |
e3a2e878 | 2699 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
2700 | * @chip: the chip the GPIO to lock belongs to |
2701 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2702 | * |
2703 | * This is used directly by GPIO drivers that want to indicate | |
2704 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 2705 | */ |
e3a2e878 | 2706 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 2707 | { |
d74be6df | 2708 | if (offset >= chip->ngpio) |
d468bf9e | 2709 | return; |
d2876d08 | 2710 | |
1c3cdb18 | 2711 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 2712 | } |
e3a2e878 | 2713 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 2714 | |
6cee3821 LW |
2715 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
2716 | { | |
2717 | if (offset >= chip->ngpio) | |
2718 | return false; | |
2719 | ||
2720 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
2721 | } | |
2722 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
2723 | ||
143b65d6 LW |
2724 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
2725 | { | |
2726 | if (offset >= chip->ngpio) | |
2727 | return false; | |
2728 | ||
2729 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
2730 | } | |
2731 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
2732 | ||
2733 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
2734 | { | |
2735 | if (offset >= chip->ngpio) | |
2736 | return false; | |
2737 | ||
2738 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
2739 | } | |
2740 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
2741 | ||
79a9becd AC |
2742 | /** |
2743 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2744 | * @desc: gpio whose value will be returned | |
2745 | * | |
2746 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 2747 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2748 | * |
2749 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2750 | */ |
79a9becd | 2751 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2752 | { |
d2876d08 | 2753 | might_sleep_if(extra_checks); |
fdeb8e15 | 2754 | VALIDATE_DESC(desc); |
79a9becd | 2755 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2756 | } |
79a9becd | 2757 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2758 | |
79a9becd AC |
2759 | /** |
2760 | * gpiod_get_value_cansleep() - return a gpio's value | |
2761 | * @desc: gpio whose value will be returned | |
2762 | * | |
2763 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2764 | * account, or negative errno on failure. |
79a9becd AC |
2765 | * |
2766 | * This function is to be called from contexts that can sleep. | |
2767 | */ | |
2768 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2769 | { |
3f397c21 | 2770 | int value; |
d2876d08 DB |
2771 | |
2772 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2773 | VALIDATE_DESC(desc); |
79a9becd | 2774 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
2775 | if (value < 0) |
2776 | return value; | |
2777 | ||
79a9becd AC |
2778 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2779 | value = !value; | |
2780 | ||
3f397c21 | 2781 | return value; |
d2876d08 | 2782 | } |
79a9becd | 2783 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2784 | |
79a9becd AC |
2785 | /** |
2786 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2787 | * @desc: gpio whose value will be assigned | |
2788 | * @value: value to assign | |
2789 | * | |
2790 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2791 | * regard for its ACTIVE_LOW status. | |
2792 | * | |
2793 | * This function is to be called from contexts that can sleep. | |
2794 | */ | |
2795 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2796 | { |
d2876d08 | 2797 | might_sleep_if(extra_checks); |
fdeb8e15 | 2798 | VALIDATE_DESC_VOID(desc); |
79a9becd | 2799 | _gpiod_set_raw_value(desc, value); |
372e722e | 2800 | } |
79a9becd | 2801 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2802 | |
79a9becd AC |
2803 | /** |
2804 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2805 | * @desc: gpio whose value will be assigned | |
2806 | * @value: value to assign | |
2807 | * | |
2808 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2809 | * account | |
2810 | * | |
2811 | * This function is to be called from contexts that can sleep. | |
2812 | */ | |
2813 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2814 | { |
d2876d08 | 2815 | might_sleep_if(extra_checks); |
fdeb8e15 | 2816 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2817 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2818 | value = !value; | |
2819 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2820 | } |
79a9becd | 2821 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2822 | |
5f424243 | 2823 | /** |
3fff99bc | 2824 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2825 | * @array_size: number of elements in the descriptor / value arrays |
2826 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2827 | * @value_array: array of values to assign | |
2828 | * | |
2829 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2830 | * without regard for their ACTIVE_LOW status. | |
2831 | * | |
2832 | * This function is to be called from contexts that can sleep. | |
2833 | */ | |
3fff99bc RI |
2834 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2835 | struct gpio_desc **desc_array, | |
2836 | int *value_array) | |
5f424243 RI |
2837 | { |
2838 | might_sleep_if(extra_checks); | |
2839 | if (!desc_array) | |
2840 | return; | |
44c7288f LW |
2841 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
2842 | value_array); | |
5f424243 | 2843 | } |
3fff99bc | 2844 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2845 | |
2846 | /** | |
3fff99bc | 2847 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2848 | * @array_size: number of elements in the descriptor / value arrays |
2849 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2850 | * @value_array: array of values to assign | |
2851 | * | |
2852 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2853 | * into account. | |
2854 | * | |
2855 | * This function is to be called from contexts that can sleep. | |
2856 | */ | |
3fff99bc RI |
2857 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2858 | struct gpio_desc **desc_array, | |
2859 | int *value_array) | |
5f424243 RI |
2860 | { |
2861 | might_sleep_if(extra_checks); | |
2862 | if (!desc_array) | |
2863 | return; | |
44c7288f LW |
2864 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
2865 | value_array); | |
5f424243 | 2866 | } |
3fff99bc | 2867 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2868 | |
bae48da2 | 2869 | /** |
ad824783 AC |
2870 | * gpiod_add_lookup_table() - register GPIO device consumers |
2871 | * @table: table of consumers to register | |
bae48da2 | 2872 | */ |
ad824783 | 2873 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2874 | { |
2875 | mutex_lock(&gpio_lookup_lock); | |
2876 | ||
ad824783 | 2877 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2878 | |
2879 | mutex_unlock(&gpio_lookup_lock); | |
2880 | } | |
2881 | ||
be9015ab SK |
2882 | /** |
2883 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2884 | * @table: table of consumers to unregister | |
2885 | */ | |
2886 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2887 | { | |
2888 | mutex_lock(&gpio_lookup_lock); | |
2889 | ||
2890 | list_del(&table->list); | |
2891 | ||
2892 | mutex_unlock(&gpio_lookup_lock); | |
2893 | } | |
2894 | ||
ad824783 | 2895 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2896 | { |
2897 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2898 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2899 | |
2900 | mutex_lock(&gpio_lookup_lock); | |
2901 | ||
ad824783 AC |
2902 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2903 | if (table->dev_id && dev_id) { | |
2904 | /* | |
2905 | * Valid strings on both ends, must be identical to have | |
2906 | * a match | |
2907 | */ | |
2908 | if (!strcmp(table->dev_id, dev_id)) | |
2909 | goto found; | |
2910 | } else { | |
2911 | /* | |
2912 | * One of the pointers is NULL, so both must be to have | |
2913 | * a match | |
2914 | */ | |
2915 | if (dev_id == table->dev_id) | |
2916 | goto found; | |
2917 | } | |
2918 | } | |
2919 | table = NULL; | |
bae48da2 | 2920 | |
ad824783 AC |
2921 | found: |
2922 | mutex_unlock(&gpio_lookup_lock); | |
2923 | return table; | |
2924 | } | |
bae48da2 | 2925 | |
ad824783 AC |
2926 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2927 | unsigned int idx, | |
2928 | enum gpio_lookup_flags *flags) | |
2929 | { | |
2a3cf6a3 | 2930 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2931 | struct gpiod_lookup_table *table; |
2932 | struct gpiod_lookup *p; | |
bae48da2 | 2933 | |
ad824783 AC |
2934 | table = gpiod_find_lookup_table(dev); |
2935 | if (!table) | |
2936 | return desc; | |
bae48da2 | 2937 | |
ad824783 AC |
2938 | for (p = &table->table[0]; p->chip_label; p++) { |
2939 | struct gpio_chip *chip; | |
bae48da2 | 2940 | |
ad824783 | 2941 | /* idx must always match exactly */ |
bae48da2 AC |
2942 | if (p->idx != idx) |
2943 | continue; | |
2944 | ||
ad824783 AC |
2945 | /* If the lookup entry has a con_id, require exact match */ |
2946 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2947 | continue; | |
bae48da2 | 2948 | |
ad824783 | 2949 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2950 | |
ad824783 | 2951 | if (!chip) { |
2a3cf6a3 AC |
2952 | dev_err(dev, "cannot find GPIO chip %s\n", |
2953 | p->chip_label); | |
2954 | return ERR_PTR(-ENODEV); | |
ad824783 | 2955 | } |
bae48da2 | 2956 | |
ad824783 | 2957 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2958 | dev_err(dev, |
2959 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2960 | idx, chip->ngpio, chip->label); | |
2961 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2962 | } |
bae48da2 | 2963 | |
bb1e88cc | 2964 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2965 | *flags = p->flags; |
bae48da2 | 2966 | |
2a3cf6a3 | 2967 | return desc; |
bae48da2 AC |
2968 | } |
2969 | ||
bae48da2 AC |
2970 | return desc; |
2971 | } | |
2972 | ||
66858527 RI |
2973 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2974 | { | |
2975 | int ret; | |
2976 | char propname[32]; | |
2977 | unsigned int i; | |
2978 | ||
2979 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2980 | if (con_id) | |
2981 | snprintf(propname, sizeof(propname), "%s-%s", | |
2982 | con_id, gpio_suffixes[i]); | |
2983 | else | |
2984 | snprintf(propname, sizeof(propname), "%s", | |
2985 | gpio_suffixes[i]); | |
2986 | ||
2987 | ret = of_gpio_named_count(dev->of_node, propname); | |
2988 | if (ret >= 0) | |
2989 | break; | |
2990 | } | |
2991 | return ret; | |
2992 | } | |
2993 | ||
2994 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
2995 | { | |
2996 | struct gpiod_lookup_table *table; | |
2997 | struct gpiod_lookup *p; | |
2998 | unsigned int count = 0; | |
2999 | ||
3000 | table = gpiod_find_lookup_table(dev); | |
3001 | if (!table) | |
3002 | return -ENOENT; | |
3003 | ||
3004 | for (p = &table->table[0]; p->chip_label; p++) { | |
3005 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3006 | (!con_id && !p->con_id)) | |
3007 | count++; | |
3008 | } | |
3009 | if (!count) | |
3010 | return -ENOENT; | |
3011 | ||
3012 | return count; | |
3013 | } | |
3014 | ||
3015 | /** | |
3016 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3017 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3018 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3019 | * @con_id: function within the GPIO consumer | |
3020 | */ | |
3021 | int gpiod_count(struct device *dev, const char *con_id) | |
3022 | { | |
3023 | int count = -ENOENT; | |
3024 | ||
3025 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3026 | count = dt_gpio_count(dev, con_id); | |
3027 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3028 | count = acpi_gpio_count(dev, con_id); | |
3029 | ||
3030 | if (count < 0) | |
3031 | count = platform_gpio_count(dev, con_id); | |
3032 | ||
3033 | return count; | |
3034 | } | |
3035 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3036 | ||
bae48da2 | 3037 | /** |
0879162f | 3038 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3039 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3040 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3041 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3042 | * |
3043 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3044 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3045 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3046 | */ |
b17d1bf1 | 3047 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3048 | enum gpiod_flags flags) |
bae48da2 | 3049 | { |
39b2bbe3 | 3050 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3051 | } |
b17d1bf1 | 3052 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3053 | |
29a1f233 TR |
3054 | /** |
3055 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3056 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3057 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3058 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3059 | * |
3060 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3061 | * the requested function it will return NULL. This is convenient for drivers | |
3062 | * that need to handle optional GPIOs. | |
3063 | */ | |
b17d1bf1 | 3064 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3065 | const char *con_id, |
3066 | enum gpiod_flags flags) | |
29a1f233 | 3067 | { |
39b2bbe3 | 3068 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3069 | } |
b17d1bf1 | 3070 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3071 | |
f625d460 BP |
3072 | |
3073 | /** | |
3074 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3075 | * @desc: gpio whose value will be assigned | |
3076 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3077 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3078 | * of_get_gpio_hog() | |
f625d460 BP |
3079 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3080 | * | |
3081 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3082 | * requested function and/or index, or another IS_ERR() code if an error | |
3083 | * occurred while trying to acquire the GPIO. | |
3084 | */ | |
3085 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
85b03b30 | 3086 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3087 | { |
3088 | int status; | |
3089 | ||
85b03b30 JH |
3090 | if (lflags & GPIO_ACTIVE_LOW) |
3091 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3092 | if (lflags & GPIO_OPEN_DRAIN) | |
3093 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3094 | if (lflags & GPIO_OPEN_SOURCE) | |
3095 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
3096 | ||
f625d460 BP |
3097 | /* No particular flag request, return here... */ |
3098 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
3099 | pr_debug("no flags found for %s\n", con_id); | |
3100 | return 0; | |
3101 | } | |
3102 | ||
3103 | /* Process flags */ | |
3104 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
3105 | status = gpiod_direction_output(desc, | |
3106 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
3107 | else | |
3108 | status = gpiod_direction_input(desc); | |
3109 | ||
3110 | return status; | |
3111 | } | |
3112 | ||
bae48da2 AC |
3113 | /** |
3114 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 3115 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
3116 | * @con_id: function within the GPIO consumer |
3117 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3118 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3119 | * |
3120 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
3121 | * defined one for functions that define several GPIOs. | |
3122 | * | |
2a3cf6a3 AC |
3123 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
3124 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 3125 | * occurred while trying to acquire the GPIO. |
bae48da2 | 3126 | */ |
b17d1bf1 | 3127 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 3128 | const char *con_id, |
39b2bbe3 AC |
3129 | unsigned int idx, |
3130 | enum gpiod_flags flags) | |
bae48da2 | 3131 | { |
35c5d7fd | 3132 | struct gpio_desc *desc = NULL; |
bae48da2 | 3133 | int status; |
39b2bbe3 | 3134 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
3135 | |
3136 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
3137 | ||
4d8440b9 RW |
3138 | if (dev) { |
3139 | /* Using device tree? */ | |
3140 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
3141 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
3142 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
3143 | } else if (ACPI_COMPANION(dev)) { | |
3144 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
25487533 | 3145 | desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); |
4d8440b9 | 3146 | } |
35c5d7fd AC |
3147 | } |
3148 | ||
3149 | /* | |
3150 | * Either we are not using DT or ACPI, or their lookup did not return | |
3151 | * a result. In that case, use platform lookup as a fallback. | |
3152 | */ | |
2a3cf6a3 | 3153 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 3154 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 3155 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
3156 | } |
3157 | ||
3158 | if (IS_ERR(desc)) { | |
351cfe0f | 3159 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
3160 | return desc; |
3161 | } | |
3162 | ||
3163 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
3164 | if (status < 0) |
3165 | return ERR_PTR(status); | |
3166 | ||
85b03b30 | 3167 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
3168 | if (status < 0) { |
3169 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
3170 | gpiod_put(desc); | |
3171 | return ERR_PTR(status); | |
3172 | } | |
3173 | ||
bae48da2 AC |
3174 | return desc; |
3175 | } | |
b17d1bf1 | 3176 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 3177 | |
40b73183 MW |
3178 | /** |
3179 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
3180 | * @fwnode: handle of the firmware node | |
3181 | * @propname: name of the firmware property representing the GPIO | |
3182 | * | |
3183 | * This function can be used for drivers that get their configuration | |
3184 | * from firmware. | |
3185 | * | |
3186 | * Function properly finds the corresponding GPIO using whatever is the | |
3187 | * underlying firmware interface and then makes sure that the GPIO | |
3188 | * descriptor is requested before it is returned to the caller. | |
3189 | * | |
3190 | * In case of error an ERR_PTR() is returned. | |
3191 | */ | |
3192 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
3193 | const char *propname) | |
3194 | { | |
3195 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
3196 | bool active_low = false; | |
90b665f6 | 3197 | bool single_ended = false; |
40b73183 MW |
3198 | int ret; |
3199 | ||
3200 | if (!fwnode) | |
3201 | return ERR_PTR(-EINVAL); | |
3202 | ||
3203 | if (is_of_node(fwnode)) { | |
3204 | enum of_gpio_flags flags; | |
3205 | ||
c181fb3e | 3206 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 3207 | &flags); |
90b665f6 | 3208 | if (!IS_ERR(desc)) { |
40b73183 | 3209 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
3210 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
3211 | } | |
40b73183 MW |
3212 | } else if (is_acpi_node(fwnode)) { |
3213 | struct acpi_gpio_info info; | |
3214 | ||
504a3374 | 3215 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 3216 | if (!IS_ERR(desc)) |
52044723 | 3217 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
3218 | } |
3219 | ||
3220 | if (IS_ERR(desc)) | |
3221 | return desc; | |
3222 | ||
85b03b30 JH |
3223 | ret = gpiod_request(desc, NULL); |
3224 | if (ret) | |
3225 | return ERR_PTR(ret); | |
3226 | ||
40b73183 MW |
3227 | if (active_low) |
3228 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3229 | ||
90b665f6 LP |
3230 | if (single_ended) { |
3231 | if (active_low) | |
3232 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3233 | else | |
3234 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
3235 | } | |
3236 | ||
40b73183 MW |
3237 | return desc; |
3238 | } | |
3239 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
3240 | ||
29a1f233 TR |
3241 | /** |
3242 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
3243 | * function | |
3244 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3245 | * @con_id: function within the GPIO consumer | |
3246 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3247 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3248 | * |
3249 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
3250 | * specified index was assigned to the requested function it will return NULL. | |
3251 | * This is convenient for drivers that need to handle optional GPIOs. | |
3252 | */ | |
b17d1bf1 | 3253 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 3254 | const char *con_id, |
39b2bbe3 AC |
3255 | unsigned int index, |
3256 | enum gpiod_flags flags) | |
29a1f233 TR |
3257 | { |
3258 | struct gpio_desc *desc; | |
3259 | ||
39b2bbe3 | 3260 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
3261 | if (IS_ERR(desc)) { |
3262 | if (PTR_ERR(desc) == -ENOENT) | |
3263 | return NULL; | |
3264 | } | |
3265 | ||
3266 | return desc; | |
3267 | } | |
b17d1bf1 | 3268 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 3269 | |
f625d460 BP |
3270 | /** |
3271 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
3272 | * @desc: gpio whose value will be assigned | |
3273 | * @name: gpio line name | |
3274 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
3275 | * of_get_gpio_hog() | |
3276 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
3277 | */ | |
3278 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
3279 | unsigned long lflags, enum gpiod_flags dflags) | |
3280 | { | |
3281 | struct gpio_chip *chip; | |
3282 | struct gpio_desc *local_desc; | |
3283 | int hwnum; | |
3284 | int status; | |
3285 | ||
3286 | chip = gpiod_to_chip(desc); | |
3287 | hwnum = gpio_chip_hwgpio(desc); | |
3288 | ||
3289 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
3290 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
3291 | status = PTR_ERR(local_desc); |
3292 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
3293 | name, chip->label, hwnum, status); | |
3294 | return status; | |
f625d460 BP |
3295 | } |
3296 | ||
85b03b30 | 3297 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 3298 | if (status < 0) { |
c31a571d LD |
3299 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
3300 | name, chip->label, hwnum, status); | |
f625d460 BP |
3301 | gpiochip_free_own_desc(desc); |
3302 | return status; | |
3303 | } | |
3304 | ||
3305 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
3306 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
3307 | ||
3308 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
3309 | desc_to_gpio(desc), name, | |
3310 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
3311 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
3312 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
3313 | ||
3314 | return 0; | |
3315 | } | |
3316 | ||
3317 | /** | |
3318 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
3319 | * @chip: gpio chip to act on | |
3320 | * | |
3321 | * This is only used by of_gpiochip_remove to free hogged gpios | |
3322 | */ | |
3323 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
3324 | { | |
3325 | int id; | |
3326 | ||
3327 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
3328 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
3329 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
3330 | } |
3331 | } | |
3332 | ||
66858527 RI |
3333 | /** |
3334 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
3335 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3336 | * @con_id: function within the GPIO consumer | |
3337 | * @flags: optional GPIO initialization flags | |
3338 | * | |
3339 | * This function acquires all the GPIOs defined under a given function. | |
3340 | * | |
3341 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
3342 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
3343 | * code if an error occurred while trying to acquire the GPIOs. | |
3344 | */ | |
3345 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
3346 | const char *con_id, | |
3347 | enum gpiod_flags flags) | |
3348 | { | |
3349 | struct gpio_desc *desc; | |
3350 | struct gpio_descs *descs; | |
3351 | int count; | |
3352 | ||
3353 | count = gpiod_count(dev, con_id); | |
3354 | if (count < 0) | |
3355 | return ERR_PTR(count); | |
3356 | ||
3357 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
3358 | GFP_KERNEL); | |
3359 | if (!descs) | |
3360 | return ERR_PTR(-ENOMEM); | |
3361 | ||
3362 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
3363 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
3364 | if (IS_ERR(desc)) { | |
3365 | gpiod_put_array(descs); | |
3366 | return ERR_CAST(desc); | |
3367 | } | |
3368 | descs->desc[descs->ndescs] = desc; | |
3369 | descs->ndescs++; | |
3370 | } | |
3371 | return descs; | |
3372 | } | |
3373 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
3374 | ||
3375 | /** | |
3376 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
3377 | * function | |
3378 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3379 | * @con_id: function within the GPIO consumer | |
3380 | * @flags: optional GPIO initialization flags | |
3381 | * | |
3382 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
3383 | * assigned to the requested function it will return NULL. | |
3384 | */ | |
3385 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
3386 | const char *con_id, | |
3387 | enum gpiod_flags flags) | |
3388 | { | |
3389 | struct gpio_descs *descs; | |
3390 | ||
3391 | descs = gpiod_get_array(dev, con_id, flags); | |
3392 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
3393 | return NULL; | |
3394 | ||
3395 | return descs; | |
3396 | } | |
3397 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
3398 | ||
bae48da2 AC |
3399 | /** |
3400 | * gpiod_put - dispose of a GPIO descriptor | |
3401 | * @desc: GPIO descriptor to dispose of | |
3402 | * | |
3403 | * No descriptor can be used after gpiod_put() has been called on it. | |
3404 | */ | |
3405 | void gpiod_put(struct gpio_desc *desc) | |
3406 | { | |
3407 | gpiod_free(desc); | |
372e722e | 3408 | } |
bae48da2 | 3409 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 3410 | |
66858527 RI |
3411 | /** |
3412 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
3413 | * @descs: struct gpio_descs containing an array of descriptors | |
3414 | */ | |
3415 | void gpiod_put_array(struct gpio_descs *descs) | |
3416 | { | |
3417 | unsigned int i; | |
3418 | ||
3419 | for (i = 0; i < descs->ndescs; i++) | |
3420 | gpiod_put(descs->desc[i]); | |
3421 | ||
3422 | kfree(descs); | |
3423 | } | |
3424 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
3425 | ||
3c702e99 LW |
3426 | static int __init gpiolib_dev_init(void) |
3427 | { | |
3428 | int ret; | |
3429 | ||
3430 | /* Register GPIO sysfs bus */ | |
3431 | ret = bus_register(&gpio_bus_type); | |
3432 | if (ret < 0) { | |
3433 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
3434 | return ret; | |
3435 | } | |
3436 | ||
3437 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
3438 | if (ret < 0) { | |
3439 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
3440 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
3441 | } else { |
3442 | gpiolib_initialized = true; | |
3443 | gpiochip_setup_devs(); | |
3c702e99 LW |
3444 | } |
3445 | return ret; | |
3446 | } | |
3447 | core_initcall(gpiolib_dev_init); | |
3448 | ||
d2876d08 DB |
3449 | #ifdef CONFIG_DEBUG_FS |
3450 | ||
fdeb8e15 | 3451 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
3452 | { |
3453 | unsigned i; | |
fdeb8e15 LW |
3454 | struct gpio_chip *chip = gdev->chip; |
3455 | unsigned gpio = gdev->base; | |
3456 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 3457 | int is_out; |
d468bf9e | 3458 | int is_irq; |
d2876d08 | 3459 | |
fdeb8e15 | 3460 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
3461 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
3462 | if (gdesc->name) { | |
3463 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
3464 | gpio, gdesc->name); | |
3465 | } | |
d2876d08 | 3466 | continue; |
ced433e2 | 3467 | } |
d2876d08 | 3468 | |
372e722e | 3469 | gpiod_get_direction(gdesc); |
d2876d08 | 3470 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 3471 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
3472 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
3473 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
3474 | is_out ? "out" : "in ", |
3475 | chip->get | |
3476 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
3477 | : "? ", |
3478 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
3479 | seq_printf(s, "\n"); |
3480 | } | |
3481 | } | |
3482 | ||
f9c4a31f | 3483 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 3484 | { |
362432ae | 3485 | unsigned long flags; |
ff2b1359 | 3486 | struct gpio_device *gdev = NULL; |
cb1650d4 | 3487 | loff_t index = *pos; |
d2876d08 | 3488 | |
f9c4a31f | 3489 | s->private = ""; |
d2876d08 | 3490 | |
362432ae | 3491 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3492 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
3493 | if (index-- == 0) { |
3494 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 3495 | return gdev; |
f9c4a31f | 3496 | } |
362432ae | 3497 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 3498 | |
cb1650d4 | 3499 | return NULL; |
f9c4a31f TR |
3500 | } |
3501 | ||
3502 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
3503 | { | |
362432ae | 3504 | unsigned long flags; |
ff2b1359 | 3505 | struct gpio_device *gdev = v; |
f9c4a31f TR |
3506 | void *ret = NULL; |
3507 | ||
362432ae | 3508 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3509 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
3510 | ret = NULL; |
3511 | else | |
ff2b1359 | 3512 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 3513 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3514 | |
3515 | s->private = "\n"; | |
3516 | ++*pos; | |
3517 | ||
3518 | return ret; | |
3519 | } | |
3520 | ||
3521 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
3522 | { | |
3523 | } | |
3524 | ||
3525 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
3526 | { | |
ff2b1359 LW |
3527 | struct gpio_device *gdev = v; |
3528 | struct gpio_chip *chip = gdev->chip; | |
3529 | struct device *parent; | |
3530 | ||
3531 | if (!chip) { | |
3532 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
3533 | dev_name(&gdev->dev)); | |
3534 | return 0; | |
3535 | } | |
f9c4a31f | 3536 | |
ff2b1359 LW |
3537 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
3538 | dev_name(&gdev->dev), | |
fdeb8e15 | 3539 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
3540 | parent = chip->parent; |
3541 | if (parent) | |
3542 | seq_printf(s, ", parent: %s/%s", | |
3543 | parent->bus ? parent->bus->name : "no-bus", | |
3544 | dev_name(parent)); | |
f9c4a31f TR |
3545 | if (chip->label) |
3546 | seq_printf(s, ", %s", chip->label); | |
3547 | if (chip->can_sleep) | |
3548 | seq_printf(s, ", can sleep"); | |
3549 | seq_printf(s, ":\n"); | |
3550 | ||
3551 | if (chip->dbg_show) | |
3552 | chip->dbg_show(s, chip); | |
3553 | else | |
fdeb8e15 | 3554 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 3555 | |
d2876d08 DB |
3556 | return 0; |
3557 | } | |
3558 | ||
f9c4a31f TR |
3559 | static const struct seq_operations gpiolib_seq_ops = { |
3560 | .start = gpiolib_seq_start, | |
3561 | .next = gpiolib_seq_next, | |
3562 | .stop = gpiolib_seq_stop, | |
3563 | .show = gpiolib_seq_show, | |
3564 | }; | |
3565 | ||
d2876d08 DB |
3566 | static int gpiolib_open(struct inode *inode, struct file *file) |
3567 | { | |
f9c4a31f | 3568 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
3569 | } |
3570 | ||
828c0950 | 3571 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 3572 | .owner = THIS_MODULE, |
d2876d08 DB |
3573 | .open = gpiolib_open, |
3574 | .read = seq_read, | |
3575 | .llseek = seq_lseek, | |
f9c4a31f | 3576 | .release = seq_release, |
d2876d08 DB |
3577 | }; |
3578 | ||
3579 | static int __init gpiolib_debugfs_init(void) | |
3580 | { | |
3581 | /* /sys/kernel/debug/gpio */ | |
3582 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
3583 | NULL, NULL, &gpiolib_operations); | |
3584 | return 0; | |
3585 | } | |
3586 | subsys_initcall(gpiolib_debugfs_init); | |
3587 | ||
3588 | #endif /* DEBUG_FS */ |