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 | ||
b8b0e3d3 LPC |
736 | if (offset >= gdev->ngpio) { |
737 | ret = -EINVAL; | |
738 | goto out_free_label; | |
739 | } | |
740 | ||
61f922db LW |
741 | /* This is just wrong: we don't look for events on output lines */ |
742 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
743 | ret = -EINVAL; | |
744 | goto out_free_label; | |
745 | } | |
746 | ||
747 | desc = &gdev->descs[offset]; | |
748 | ret = gpiod_request(desc, le->label); | |
749 | if (ret) | |
750 | goto out_free_desc; | |
751 | le->desc = desc; | |
752 | le->eflags = eflags; | |
753 | ||
754 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
755 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
756 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
757 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
758 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
759 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
760 | ||
761 | ret = gpiod_direction_input(desc); | |
762 | if (ret) | |
763 | goto out_free_desc; | |
764 | ||
765 | le->irq = gpiod_to_irq(desc); | |
766 | if (le->irq <= 0) { | |
767 | ret = -ENODEV; | |
768 | goto out_free_desc; | |
769 | } | |
770 | ||
771 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
772 | irqflags |= IRQF_TRIGGER_RISING; | |
773 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
774 | irqflags |= IRQF_TRIGGER_FALLING; | |
775 | irqflags |= IRQF_ONESHOT; | |
776 | irqflags |= IRQF_SHARED; | |
777 | ||
778 | INIT_KFIFO(le->events); | |
779 | init_waitqueue_head(&le->wait); | |
780 | mutex_init(&le->read_lock); | |
781 | ||
782 | /* Request a thread to read the events */ | |
783 | ret = request_threaded_irq(le->irq, | |
784 | NULL, | |
785 | lineevent_irq_thread, | |
786 | irqflags, | |
787 | le->label, | |
788 | le); | |
789 | if (ret) | |
790 | goto out_free_desc; | |
791 | ||
792 | fd = anon_inode_getfd("gpio-event", | |
793 | &lineevent_fileops, | |
794 | le, | |
795 | O_RDONLY | O_CLOEXEC); | |
796 | if (fd < 0) { | |
797 | ret = fd; | |
798 | goto out_free_irq; | |
799 | } | |
800 | ||
801 | eventreq.fd = fd; | |
d932cd49 LW |
802 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
803 | ret = -EFAULT; | |
804 | goto out_free_irq; | |
805 | } | |
61f922db LW |
806 | |
807 | return 0; | |
808 | ||
809 | out_free_irq: | |
810 | free_irq(le->irq, le); | |
811 | out_free_desc: | |
812 | gpiod_free(le->desc); | |
813 | out_free_label: | |
814 | kfree(le->label); | |
815 | out_free_le: | |
816 | kfree(le); | |
817 | put_device(&gdev->dev); | |
818 | return ret; | |
819 | } | |
820 | ||
3c702e99 LW |
821 | /** |
822 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
823 | */ | |
824 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
825 | { | |
826 | struct gpio_device *gdev = filp->private_data; | |
827 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 828 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
829 | |
830 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
831 | if (!chip) | |
832 | return -ENODEV; | |
833 | ||
521a2ad6 | 834 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 835 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
836 | struct gpiochip_info chipinfo; |
837 | ||
0f4bbb23 LPC |
838 | memset(&chipinfo, 0, sizeof(chipinfo)); |
839 | ||
3c702e99 LW |
840 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
841 | sizeof(chipinfo.name)); | |
842 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
843 | strncpy(chipinfo.label, gdev->label, |
844 | sizeof(chipinfo.label)); | |
845 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 846 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
847 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
848 | return -EFAULT; | |
849 | return 0; | |
521a2ad6 LW |
850 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
851 | struct gpioline_info lineinfo; | |
852 | struct gpio_desc *desc; | |
853 | ||
854 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
855 | return -EFAULT; | |
1f1cc456 | 856 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
857 | return -EINVAL; |
858 | ||
859 | desc = &gdev->descs[lineinfo.line_offset]; | |
860 | if (desc->name) { | |
861 | strncpy(lineinfo.name, desc->name, | |
862 | sizeof(lineinfo.name)); | |
863 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
864 | } else { | |
865 | lineinfo.name[0] = '\0'; | |
866 | } | |
867 | if (desc->label) { | |
214338e3 LW |
868 | strncpy(lineinfo.consumer, desc->label, |
869 | sizeof(lineinfo.consumer)); | |
870 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 871 | } else { |
214338e3 | 872 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
873 | } |
874 | ||
875 | /* | |
876 | * Userspace only need to know that the kernel is using | |
877 | * this GPIO so it can't use it. | |
878 | */ | |
879 | lineinfo.flags = 0; | |
9d8cc89c LW |
880 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
881 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
882 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
883 | test_bit(FLAG_EXPORT, &desc->flags) || | |
884 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 885 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 886 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 887 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 888 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 889 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 890 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 891 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 892 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
893 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
894 | ||
895 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
896 | return -EFAULT; | |
897 | return 0; | |
d7c51b47 LW |
898 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
899 | return linehandle_create(gdev, ip); | |
61f922db LW |
900 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
901 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
902 | } |
903 | return -EINVAL; | |
904 | } | |
905 | ||
8b92e17e LW |
906 | #ifdef CONFIG_COMPAT |
907 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
908 | unsigned long arg) | |
909 | { | |
910 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
911 | } | |
912 | #endif | |
913 | ||
3c702e99 LW |
914 | /** |
915 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
916 | * @inode: inode for this chardev | |
917 | * @filp: file struct for storing private data | |
918 | * Returns 0 on success | |
919 | */ | |
920 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
921 | { | |
922 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
923 | struct gpio_device, chrdev); | |
924 | ||
925 | /* Fail on open if the backing gpiochip is gone */ | |
926 | if (!gdev || !gdev->chip) | |
927 | return -ENODEV; | |
928 | get_device(&gdev->dev); | |
929 | filp->private_data = gdev; | |
930 | return 0; | |
931 | } | |
932 | ||
933 | /** | |
934 | * gpio_chrdev_release() - close chardev after ioctl operations | |
935 | * @inode: inode for this chardev | |
936 | * @filp: file struct for storing private data | |
937 | * Returns 0 on success | |
938 | */ | |
939 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
940 | { | |
941 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
942 | struct gpio_device, chrdev); | |
943 | ||
944 | if (!gdev) | |
945 | return -ENODEV; | |
946 | put_device(&gdev->dev); | |
947 | return 0; | |
948 | } | |
949 | ||
950 | ||
951 | static const struct file_operations gpio_fileops = { | |
952 | .release = gpio_chrdev_release, | |
953 | .open = gpio_chrdev_open, | |
954 | .owner = THIS_MODULE, | |
955 | .llseek = noop_llseek, | |
956 | .unlocked_ioctl = gpio_ioctl, | |
8b92e17e LW |
957 | #ifdef CONFIG_COMPAT |
958 | .compat_ioctl = gpio_ioctl_compat, | |
959 | #endif | |
3c702e99 LW |
960 | }; |
961 | ||
ff2b1359 LW |
962 | static void gpiodevice_release(struct device *dev) |
963 | { | |
964 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
965 | ||
966 | list_del(&gdev->list); | |
967 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
968 | kfree(gdev->label); |
969 | kfree(gdev->descs); | |
9efd9e69 | 970 | kfree(gdev); |
ff2b1359 LW |
971 | } |
972 | ||
159f3cd9 GR |
973 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
974 | { | |
975 | int status; | |
976 | ||
977 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
978 | gdev->chrdev.owner = THIS_MODULE; | |
979 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
980 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
981 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
982 | if (status < 0) | |
983 | chip_warn(gdev->chip, "failed to add char device %d:%d\n", | |
984 | MAJOR(gpio_devt), gdev->id); | |
985 | else | |
986 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
987 | MAJOR(gpio_devt), gdev->id); | |
988 | status = device_add(&gdev->dev); | |
989 | if (status) | |
990 | goto err_remove_chardev; | |
991 | ||
992 | status = gpiochip_sysfs_register(gdev); | |
993 | if (status) | |
994 | goto err_remove_device; | |
995 | ||
996 | /* From this point, the .release() function cleans up gpio_device */ | |
997 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
998 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
999 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1000 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1001 | ||
1002 | return 0; | |
1003 | ||
1004 | err_remove_device: | |
1005 | device_del(&gdev->dev); | |
1006 | err_remove_chardev: | |
1007 | cdev_del(&gdev->chrdev); | |
1008 | return status; | |
1009 | } | |
1010 | ||
1011 | static void gpiochip_setup_devs(void) | |
1012 | { | |
1013 | struct gpio_device *gdev; | |
1014 | int err; | |
1015 | ||
1016 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1017 | err = gpiochip_setup_dev(gdev); | |
1018 | if (err) | |
1019 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1020 | dev_name(&gdev->dev), err); | |
1021 | } | |
1022 | } | |
1023 | ||
d2876d08 | 1024 | /** |
b08ea35a | 1025 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 1026 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 1027 | * Context: potentially before irqs will work |
d2876d08 DB |
1028 | * |
1029 | * Returns a negative errno if the chip can't be registered, such as | |
1030 | * because the chip->base is invalid or already associated with a | |
1031 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 1032 | * |
b08ea35a | 1033 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 1034 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
1035 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
1036 | * for GPIOs will fail rudely. | |
1037 | * | |
159f3cd9 GR |
1038 | * gpiochip_add_data() must only be called after gpiolib initialization, |
1039 | * ie after core_initcall(). | |
1040 | * | |
8d0aab2f AV |
1041 | * If chip->base is negative, this requests dynamic assignment of |
1042 | * a range of valid GPIOs. | |
d2876d08 | 1043 | */ |
b08ea35a | 1044 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
1045 | { |
1046 | unsigned long flags; | |
1047 | int status = 0; | |
ff2b1359 | 1048 | unsigned i; |
8d0aab2f | 1049 | int base = chip->base; |
ff2b1359 | 1050 | struct gpio_device *gdev; |
d2876d08 | 1051 | |
ff2b1359 LW |
1052 | /* |
1053 | * First: allocate and populate the internal stat container, and | |
1054 | * set up the struct device. | |
1055 | */ | |
969f07b4 | 1056 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1057 | if (!gdev) |
14e85c0e | 1058 | return -ENOMEM; |
3c702e99 | 1059 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1060 | gdev->chip = chip; |
1061 | chip->gpiodev = gdev; | |
1062 | if (chip->parent) { | |
1063 | gdev->dev.parent = chip->parent; | |
1064 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1065 | } |
1066 | ||
ff2b1359 LW |
1067 | #ifdef CONFIG_OF_GPIO |
1068 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1069 | if (chip->of_node) |
1070 | gdev->dev.of_node = chip->of_node; | |
ff2b1359 | 1071 | #endif |
acc6e331 | 1072 | |
ff2b1359 LW |
1073 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1074 | if (gdev->id < 0) { | |
1075 | status = gdev->id; | |
1076 | goto err_free_gdev; | |
1077 | } | |
1078 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1079 | device_initialize(&gdev->dev); | |
1080 | dev_set_drvdata(&gdev->dev, gdev); | |
1081 | if (chip->parent && chip->parent->driver) | |
1082 | gdev->owner = chip->parent->driver->owner; | |
1083 | else if (chip->owner) | |
1084 | /* TODO: remove chip->owner */ | |
1085 | gdev->owner = chip->owner; | |
1086 | else | |
1087 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1088 | |
476e2fc5 | 1089 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1090 | if (!gdev->descs) { |
ff2b1359 LW |
1091 | status = -ENOMEM; |
1092 | goto err_free_gdev; | |
1093 | } | |
1094 | ||
5ed41cc4 BJZ |
1095 | if (chip->ngpio == 0) { |
1096 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1097 | status = -EINVAL; |
159f3cd9 | 1098 | goto err_free_descs; |
5ed41cc4 | 1099 | } |
df4878e9 LW |
1100 | |
1101 | if (chip->label) | |
476e2fc5 | 1102 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 1103 | else |
476e2fc5 | 1104 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
1105 | if (!gdev->label) { |
1106 | status = -ENOMEM; | |
476e2fc5 | 1107 | goto err_free_descs; |
df4878e9 LW |
1108 | } |
1109 | ||
fdeb8e15 | 1110 | gdev->ngpio = chip->ngpio; |
43c54eca | 1111 | gdev->data = data; |
5ed41cc4 | 1112 | |
d2876d08 DB |
1113 | spin_lock_irqsave(&gpio_lock, flags); |
1114 | ||
fdeb8e15 LW |
1115 | /* |
1116 | * TODO: this allocates a Linux GPIO number base in the global | |
1117 | * GPIO numberspace for this chip. In the long run we want to | |
1118 | * get *rid* of this numberspace and use only descriptors, but | |
1119 | * it may be a pipe dream. It will not happen before we get rid | |
1120 | * of the sysfs interface anyways. | |
1121 | */ | |
8d0aab2f AV |
1122 | if (base < 0) { |
1123 | base = gpiochip_find_base(chip->ngpio); | |
1124 | if (base < 0) { | |
1125 | status = base; | |
225fce83 | 1126 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1127 | goto err_free_label; |
8d0aab2f | 1128 | } |
fdeb8e15 LW |
1129 | /* |
1130 | * TODO: it should not be necessary to reflect the assigned | |
1131 | * base outside of the GPIO subsystem. Go over drivers and | |
1132 | * see if anyone makes use of this, else drop this and assign | |
1133 | * a poison instead. | |
1134 | */ | |
8d0aab2f AV |
1135 | chip->base = base; |
1136 | } | |
fdeb8e15 | 1137 | gdev->base = base; |
8d0aab2f | 1138 | |
ff2b1359 | 1139 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1140 | if (status) { |
1141 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1142 | goto err_free_label; |
05aa5203 | 1143 | } |
1a989d0f | 1144 | |
545ebd9a LW |
1145 | spin_unlock_irqrestore(&gpio_lock, flags); |
1146 | ||
ff2b1359 | 1147 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1148 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1149 | |
fdeb8e15 | 1150 | desc->gdev = gdev; |
72d32000 LW |
1151 | /* |
1152 | * REVISIT: most hardware initializes GPIOs as inputs | |
1153 | * (often with pullups enabled) so power usage is | |
1154 | * minimized. Linux code should set the gpio direction | |
1155 | * first thing; but until it does, and in case | |
1156 | * chip->get_direction is not set, we may expose the | |
1157 | * wrong direction in sysfs. | |
05aa5203 | 1158 | */ |
72d32000 LW |
1159 | |
1160 | if (chip->get_direction) { | |
1161 | /* | |
1162 | * If we have .get_direction, set up the initial | |
1163 | * direction flag from the hardware. | |
1164 | */ | |
1165 | int dir = chip->get_direction(chip, i); | |
1166 | ||
1167 | if (!dir) | |
1168 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1169 | } else if (!chip->direction_input) { | |
1170 | /* | |
1171 | * If the chip lacks the .direction_input callback | |
1172 | * we logically assume all lines are outputs. | |
1173 | */ | |
1174 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1175 | } | |
d2876d08 | 1176 | } |
14e85c0e | 1177 | |
f23f1516 | 1178 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1179 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1180 | #endif |
1181 | ||
5f3ca732 MP |
1182 | status = gpiochip_set_desc_names(chip); |
1183 | if (status) | |
1184 | goto err_remove_from_list; | |
1185 | ||
79b804cb MW |
1186 | status = gpiochip_irqchip_init_valid_mask(chip); |
1187 | if (status) | |
1188 | goto err_remove_from_list; | |
1189 | ||
28355f81 TV |
1190 | status = of_gpiochip_add(chip); |
1191 | if (status) | |
1192 | goto err_remove_chip; | |
1193 | ||
664e3e5a | 1194 | acpi_gpiochip_add(chip); |
391c970c | 1195 | |
3c702e99 LW |
1196 | /* |
1197 | * By first adding the chardev, and then adding the device, | |
1198 | * we get a device node entry in sysfs under | |
1199 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1200 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1201 | * We can do this only if gpiolib has been initialized. |
1202 | * Otherwise, defer until later. | |
3c702e99 | 1203 | */ |
159f3cd9 GR |
1204 | if (gpiolib_initialized) { |
1205 | status = gpiochip_setup_dev(gdev); | |
1206 | if (status) | |
1207 | goto err_remove_chip; | |
1208 | } | |
cedb1881 | 1209 | return 0; |
3bae4811 | 1210 | |
225fce83 JH |
1211 | err_remove_chip: |
1212 | acpi_gpiochip_remove(chip); | |
6d86750c | 1213 | gpiochip_free_hogs(chip); |
225fce83 | 1214 | of_gpiochip_remove(chip); |
79b804cb | 1215 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1216 | err_remove_from_list: |
225fce83 | 1217 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1218 | list_del(&gdev->list); |
3bae4811 | 1219 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
1220 | err_free_label: |
1221 | kfree(gdev->label); | |
1222 | err_free_descs: | |
1223 | kfree(gdev->descs); | |
ff2b1359 LW |
1224 | err_free_gdev: |
1225 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1226 | /* failures here can mean systems won't boot... */ |
7589e59f | 1227 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
1228 | gdev->base, gdev->base + gdev->ngpio - 1, |
1229 | chip->label ? : "generic"); | |
1230 | kfree(gdev); | |
d2876d08 DB |
1231 | return status; |
1232 | } | |
b08ea35a | 1233 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 1234 | |
43c54eca LW |
1235 | /** |
1236 | * gpiochip_get_data() - get per-subdriver data for the chip | |
1237 | */ | |
1238 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1239 | { | |
1240 | return chip->gpiodev->data; | |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1243 | ||
d2876d08 DB |
1244 | /** |
1245 | * gpiochip_remove() - unregister a gpio_chip | |
1246 | * @chip: the chip to unregister | |
1247 | * | |
1248 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1249 | */ | |
e1db1706 | 1250 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1251 | { |
ff2b1359 | 1252 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1253 | struct gpio_desc *desc; |
d2876d08 | 1254 | unsigned long flags; |
1c3cdb18 | 1255 | unsigned i; |
fab28b89 | 1256 | bool requested = false; |
d2876d08 | 1257 | |
ff2b1359 | 1258 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1259 | gpiochip_sysfs_unregister(gdev); |
bd203bd5 BJZ |
1260 | /* Numb the device, cancelling all outstanding operations */ |
1261 | gdev->chip = NULL; | |
00acc3dc | 1262 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1263 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1264 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 1265 | gpiochip_free_hogs(chip); |
391c970c | 1266 | of_gpiochip_remove(chip); |
43c54eca LW |
1267 | /* |
1268 | * We accept no more calls into the driver from this point, so | |
1269 | * NULL the driver data pointer | |
1270 | */ | |
1271 | gdev->data = NULL; | |
391c970c | 1272 | |
6798acaa | 1273 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1274 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1275 | desc = &gdev->descs[i]; |
fab28b89 JH |
1276 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1277 | requested = true; | |
d2876d08 | 1278 | } |
d2876d08 | 1279 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1280 | |
fab28b89 | 1281 | if (requested) |
fdeb8e15 | 1282 | dev_crit(&gdev->dev, |
58383c78 | 1283 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1284 | |
ff2b1359 LW |
1285 | /* |
1286 | * The gpiochip side puts its use of the device to rest here: | |
1287 | * if there are no userspace clients, the chardev and device will | |
1288 | * be removed, else it will be dangling until the last user is | |
1289 | * gone. | |
1290 | */ | |
f4833b8c RRD |
1291 | cdev_del(&gdev->chrdev); |
1292 | device_del(&gdev->dev); | |
ff2b1359 | 1293 | put_device(&gdev->dev); |
d2876d08 DB |
1294 | } |
1295 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1296 | ||
0cf3292c LD |
1297 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1298 | { | |
1299 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1300 | ||
1301 | gpiochip_remove(chip); | |
1302 | } | |
1303 | ||
1304 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1305 | ||
1306 | { | |
1307 | struct gpio_chip **r = res; | |
1308 | ||
1309 | if (!r || !*r) { | |
1310 | WARN_ON(!r || !*r); | |
1311 | return 0; | |
1312 | } | |
1313 | ||
1314 | return *r == data; | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
1319 | * @dev: the device pointer on which irq_chip belongs to. | |
1320 | * @chip: the chip to register, with chip->base initialized | |
1321 | * Context: potentially before irqs will work | |
1322 | * | |
1323 | * Returns a negative errno if the chip can't be registered, such as | |
1324 | * because the chip->base is invalid or already associated with a | |
1325 | * different chip. Otherwise it returns zero as a success code. | |
1326 | * | |
1327 | * The gpio chip automatically be released when the device is unbound. | |
1328 | */ | |
1329 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1330 | void *data) | |
1331 | { | |
1332 | struct gpio_chip **ptr; | |
1333 | int ret; | |
1334 | ||
1335 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1336 | GFP_KERNEL); | |
1337 | if (!ptr) | |
1338 | return -ENOMEM; | |
1339 | ||
1340 | ret = gpiochip_add_data(chip, data); | |
1341 | if (ret < 0) { | |
1342 | devres_free(ptr); | |
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | *ptr = chip; | |
1347 | devres_add(dev, ptr); | |
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1352 | ||
1353 | /** | |
1354 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1355 | * @dev: device for which which resource was allocated | |
1356 | * @chip: the chip to remove | |
1357 | * | |
1358 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1359 | */ | |
1360 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1361 | { | |
1362 | int ret; | |
1363 | ||
1364 | ret = devres_release(dev, devm_gpio_chip_release, | |
1365 | devm_gpio_chip_match, chip); | |
1366 | if (!ret) | |
1367 | WARN_ON(ret); | |
1368 | } | |
1369 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1370 | ||
594fa265 GL |
1371 | /** |
1372 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1373 | * @data: data to pass to match function | |
1374 | * @callback: Callback function to check gpio_chip | |
1375 | * | |
1376 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1377 | * determined by a user supplied @match callback. The callback should return | |
1378 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1379 | * non-zero, this function will return to the caller and not iterate over any | |
1380 | * more gpio_chips. | |
1381 | */ | |
07ce8ec7 | 1382 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1383 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1384 | void *data)) |
594fa265 | 1385 | { |
ff2b1359 | 1386 | struct gpio_device *gdev; |
acf06ff7 | 1387 | struct gpio_chip *chip = NULL; |
594fa265 | 1388 | unsigned long flags; |
594fa265 GL |
1389 | |
1390 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1391 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1392 | if (gdev->chip && match(gdev->chip, data)) { |
1393 | chip = gdev->chip; | |
594fa265 | 1394 | break; |
acf06ff7 | 1395 | } |
ff2b1359 | 1396 | |
594fa265 GL |
1397 | spin_unlock_irqrestore(&gpio_lock, flags); |
1398 | ||
1399 | return chip; | |
1400 | } | |
8fa0c9bf | 1401 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1402 | |
79697ef9 AC |
1403 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1404 | { | |
1405 | const char *name = data; | |
1406 | ||
1407 | return !strcmp(chip->label, name); | |
1408 | } | |
1409 | ||
1410 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1411 | { | |
1412 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1413 | } | |
1414 | ||
14250520 LW |
1415 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1416 | ||
1417 | /* | |
1418 | * The following is irqchip helper code for gpiochips. | |
1419 | */ | |
1420 | ||
79b804cb MW |
1421 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1422 | { | |
1423 | int i; | |
1424 | ||
1425 | if (!gpiochip->irq_need_valid_mask) | |
1426 | return 0; | |
1427 | ||
1428 | gpiochip->irq_valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio), | |
1429 | sizeof(long), GFP_KERNEL); | |
1430 | if (!gpiochip->irq_valid_mask) | |
1431 | return -ENOMEM; | |
1432 | ||
1433 | /* Assume by default all GPIOs are valid */ | |
1434 | for (i = 0; i < gpiochip->ngpio; i++) | |
1435 | set_bit(i, gpiochip->irq_valid_mask); | |
1436 | ||
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1441 | { | |
1442 | kfree(gpiochip->irq_valid_mask); | |
1443 | gpiochip->irq_valid_mask = NULL; | |
1444 | } | |
1445 | ||
1446 | static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, | |
1447 | unsigned int offset) | |
1448 | { | |
1449 | /* No mask means all valid */ | |
1450 | if (likely(!gpiochip->irq_valid_mask)) | |
1451 | return true; | |
1452 | return test_bit(offset, gpiochip->irq_valid_mask); | |
1453 | } | |
1454 | ||
14250520 | 1455 | /** |
3f97d5fc LW |
1456 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
1457 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1458 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1459 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1460 | * chained irqchip | |
1461 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1462 | * coming out of the gpiochip. If the interrupt is nested rather than |
1463 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
1464 | */ |
1465 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1466 | struct irq_chip *irqchip, | |
1467 | int parent_irq, | |
1468 | irq_flow_handler_t parent_handler) | |
1469 | { | |
83141a77 LW |
1470 | unsigned int offset; |
1471 | ||
83141a77 LW |
1472 | if (!gpiochip->irqdomain) { |
1473 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
1474 | __func__); | |
1c8732bb LW |
1475 | return; |
1476 | } | |
1477 | ||
3f97d5fc LW |
1478 | if (parent_handler) { |
1479 | if (gpiochip->can_sleep) { | |
1480 | chip_err(gpiochip, | |
1481 | "you cannot have chained interrupts on a " | |
1482 | "chip that may sleep\n"); | |
1483 | return; | |
1484 | } | |
3f97d5fc LW |
1485 | /* |
1486 | * The parent irqchip is already using the chip_data for this | |
1487 | * irqchip, so our callbacks simply use the handler_data. | |
1488 | */ | |
f7f87753 TG |
1489 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1490 | gpiochip); | |
25e4fe92 DES |
1491 | |
1492 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 1493 | } |
83141a77 LW |
1494 | |
1495 | /* Set the parent IRQ for all affected IRQs */ | |
79b804cb MW |
1496 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1497 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1498 | continue; | |
83141a77 LW |
1499 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), |
1500 | parent_irq); | |
79b804cb | 1501 | } |
14250520 LW |
1502 | } |
1503 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
1504 | ||
1505 | /** | |
1506 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1507 | * @d: the irqdomain used by this irqchip | |
1508 | * @irq: the global irq number used by this GPIO irqchip irq | |
1509 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1510 | * | |
1511 | * This function will set up the mapping for a certain IRQ line on a | |
1512 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1513 | * stored inside the gpiochip. | |
1514 | */ | |
1515 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
1516 | irq_hw_number_t hwirq) | |
1517 | { | |
1518 | struct gpio_chip *chip = d->host_data; | |
1519 | ||
14250520 | 1520 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1521 | /* |
1522 | * This lock class tells lockdep that GPIO irqs are in a different | |
1523 | * category than their parents, so it won't report false recursion. | |
1524 | */ | |
1525 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 1526 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 1527 | /* Chips that can sleep need nested thread handlers */ |
295494af | 1528 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 1529 | irq_set_nested_thread(irq, 1); |
14250520 | 1530 | irq_set_noprobe(irq); |
23393d49 | 1531 | |
1333b90f LW |
1532 | /* |
1533 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1534 | * is passed as default type. | |
1535 | */ | |
1536 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
1537 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
1538 | |
1539 | return 0; | |
1540 | } | |
1541 | ||
c3626fde LW |
1542 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
1543 | { | |
1c8732bb LW |
1544 | struct gpio_chip *chip = d->host_data; |
1545 | ||
1c8732bb LW |
1546 | if (chip->can_sleep) |
1547 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
1548 | irq_set_chip_and_handler(irq, NULL, NULL); |
1549 | irq_set_chip_data(irq, NULL); | |
1550 | } | |
1551 | ||
14250520 LW |
1552 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1553 | .map = gpiochip_irq_map, | |
c3626fde | 1554 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1555 | /* Virtually all GPIO irqchips are twocell:ed */ |
1556 | .xlate = irq_domain_xlate_twocell, | |
1557 | }; | |
1558 | ||
1559 | static int gpiochip_irq_reqres(struct irq_data *d) | |
1560 | { | |
1561 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1562 | ||
ff2b1359 | 1563 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1564 | return -ENODEV; |
1565 | ||
e3a2e878 | 1566 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1567 | chip_err(chip, |
1568 | "unable to lock HW IRQ %lu for IRQ\n", | |
1569 | d->hwirq); | |
ff2b1359 | 1570 | module_put(chip->gpiodev->owner); |
14250520 LW |
1571 | return -EINVAL; |
1572 | } | |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | static void gpiochip_irq_relres(struct irq_data *d) | |
1577 | { | |
1578 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1579 | ||
e3a2e878 | 1580 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1581 | module_put(chip->gpiodev->owner); |
14250520 LW |
1582 | } |
1583 | ||
1584 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1585 | { | |
1586 | return irq_find_mapping(chip->irqdomain, offset); | |
1587 | } | |
1588 | ||
1589 | /** | |
1590 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1591 | * @gpiochip: the gpiochip to remove the irqchip from | |
1592 | * | |
1593 | * This is called only from gpiochip_remove() | |
1594 | */ | |
1595 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1596 | { | |
c3626fde LW |
1597 | unsigned int offset; |
1598 | ||
afa82fab MW |
1599 | acpi_gpiochip_free_interrupts(gpiochip); |
1600 | ||
25e4fe92 DES |
1601 | if (gpiochip->irq_parent) { |
1602 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
1603 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
1604 | } | |
1605 | ||
c3626fde LW |
1606 | /* Remove all IRQ mappings and delete the domain */ |
1607 | if (gpiochip->irqdomain) { | |
79b804cb MW |
1608 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1609 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1610 | continue; | |
e3893386 GS |
1611 | irq_dispose_mapping( |
1612 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
79b804cb | 1613 | } |
14250520 | 1614 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 1615 | } |
14250520 LW |
1616 | |
1617 | if (gpiochip->irqchip) { | |
1618 | gpiochip->irqchip->irq_request_resources = NULL; | |
1619 | gpiochip->irqchip->irq_release_resources = NULL; | |
1620 | gpiochip->irqchip = NULL; | |
1621 | } | |
79b804cb MW |
1622 | |
1623 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
1624 | } |
1625 | ||
1626 | /** | |
1627 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
1628 | * @gpiochip: the gpiochip to add the irqchip to | |
1629 | * @irqchip: the irqchip to add to the gpiochip | |
1630 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1631 | * allocate gpiochip irqs from | |
1632 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1633 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1634 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 1635 | * @lock_key: lockdep class |
14250520 LW |
1636 | * |
1637 | * This function closely associates a certain irqchip with a certain | |
1638 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1639 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1640 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1641 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1642 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1643 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1644 | * translation. The gpiochip will need to be initialized and registered | |
1645 | * before calling this function. | |
1646 | * | |
c3626fde LW |
1647 | * This function will handle two cell:ed simple IRQs and assumes all |
1648 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1649 | * need to be open coded. |
1650 | */ | |
a0a8bcf4 GS |
1651 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
1652 | struct irq_chip *irqchip, | |
1653 | unsigned int first_irq, | |
1654 | irq_flow_handler_t handler, | |
1655 | unsigned int type, | |
1656 | struct lock_class_key *lock_key) | |
14250520 LW |
1657 | { |
1658 | struct device_node *of_node; | |
79b804cb | 1659 | bool irq_base_set = false; |
14250520 | 1660 | unsigned int offset; |
c3626fde | 1661 | unsigned irq_base = 0; |
14250520 LW |
1662 | |
1663 | if (!gpiochip || !irqchip) | |
1664 | return -EINVAL; | |
1665 | ||
58383c78 | 1666 | if (!gpiochip->parent) { |
14250520 LW |
1667 | pr_err("missing gpiochip .dev parent pointer\n"); |
1668 | return -EINVAL; | |
1669 | } | |
58383c78 | 1670 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1671 | #ifdef CONFIG_OF_GPIO |
1672 | /* | |
20a8a968 | 1673 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1674 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1675 | * everywhere | |
14250520 LW |
1676 | */ |
1677 | if (gpiochip->of_node) | |
1678 | of_node = gpiochip->of_node; | |
1679 | #endif | |
332e99d5 | 1680 | /* |
0a1e0053 | 1681 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
1682 | * used to configure the interrupts, as you may end-up with |
1683 | * conflicting triggers. Tell the user, and reset to NONE. | |
1684 | */ | |
1685 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
1686 | "%s: Ignoring %d default trigger\n", of_node->full_name, type)) | |
1687 | type = IRQ_TYPE_NONE; | |
0a1e0053 MW |
1688 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
1689 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1690 | "Ignoring %d default trigger\n", type); | |
1691 | type = IRQ_TYPE_NONE; | |
1692 | } | |
332e99d5 | 1693 | |
14250520 LW |
1694 | gpiochip->irqchip = irqchip; |
1695 | gpiochip->irq_handler = handler; | |
1696 | gpiochip->irq_default_type = type; | |
1697 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 1698 | gpiochip->lock_key = lock_key; |
14250520 LW |
1699 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1700 | gpiochip->ngpio, first_irq, | |
1701 | &gpiochip_domain_ops, gpiochip); | |
1702 | if (!gpiochip->irqdomain) { | |
1703 | gpiochip->irqchip = NULL; | |
1704 | return -EINVAL; | |
1705 | } | |
8b67a1f0 RV |
1706 | |
1707 | /* | |
1708 | * It is possible for a driver to override this, but only if the | |
1709 | * alternative functions are both implemented. | |
1710 | */ | |
1711 | if (!irqchip->irq_request_resources && | |
1712 | !irqchip->irq_release_resources) { | |
1713 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1714 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1715 | } | |
14250520 LW |
1716 | |
1717 | /* | |
1718 | * Prepare the mapping since the irqchip shall be orthogonal to | |
1719 | * any gpiochip calls. If the first_irq was zero, this is | |
1720 | * necessary to allocate descriptors for all IRQs. | |
1721 | */ | |
c3626fde | 1722 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
79b804cb MW |
1723 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) |
1724 | continue; | |
c3626fde | 1725 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); |
79b804cb | 1726 | if (!irq_base_set) { |
c3626fde LW |
1727 | /* |
1728 | * Store the base into the gpiochip to be used when | |
1729 | * unmapping the irqs. | |
1730 | */ | |
1731 | gpiochip->irq_base = irq_base; | |
79b804cb MW |
1732 | irq_base_set = true; |
1733 | } | |
c3626fde | 1734 | } |
14250520 | 1735 | |
afa82fab MW |
1736 | acpi_gpiochip_request_interrupts(gpiochip); |
1737 | ||
14250520 LW |
1738 | return 0; |
1739 | } | |
a0a8bcf4 | 1740 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
1741 | |
1742 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1743 | ||
1744 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
79b804cb MW |
1745 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1746 | { | |
1747 | return 0; | |
1748 | } | |
1749 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1750 | { } | |
14250520 LW |
1751 | |
1752 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1753 | ||
c771c2f4 JG |
1754 | /** |
1755 | * gpiochip_generic_request() - request the gpio function for a pin | |
1756 | * @chip: the gpiochip owning the GPIO | |
1757 | * @offset: the offset of the GPIO to request for GPIO function | |
1758 | */ | |
1759 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1760 | { | |
fdeb8e15 | 1761 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1762 | } |
1763 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1764 | ||
1765 | /** | |
1766 | * gpiochip_generic_free() - free the gpio function from a pin | |
1767 | * @chip: the gpiochip to request the gpio function for | |
1768 | * @offset: the offset of the GPIO to free from GPIO function | |
1769 | */ | |
1770 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1771 | { | |
fdeb8e15 | 1772 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1773 | } |
1774 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1775 | ||
f23f1516 | 1776 | #ifdef CONFIG_PINCTRL |
165adc9c | 1777 | |
586a87e6 CR |
1778 | /** |
1779 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1780 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1781 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1782 | * @gpio_offset: the start offset in the current gpio_chip number space |
1783 | * @pin_group: name of the pin group inside the pin controller | |
1784 | */ | |
1785 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1786 | struct pinctrl_dev *pctldev, | |
1787 | unsigned int gpio_offset, const char *pin_group) | |
1788 | { | |
1789 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1790 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1791 | int ret; |
1792 | ||
1793 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1794 | if (!pin_range) { | |
1a2a99c6 | 1795 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1796 | return -ENOMEM; |
1797 | } | |
1798 | ||
1799 | /* Use local offset as range ID */ | |
1800 | pin_range->range.id = gpio_offset; | |
1801 | pin_range->range.gc = chip; | |
1802 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1803 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1804 | pin_range->pctldev = pctldev; |
1805 | ||
1806 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1807 | &pin_range->range.pins, | |
1808 | &pin_range->range.npins); | |
61c6375d MN |
1809 | if (ret < 0) { |
1810 | kfree(pin_range); | |
586a87e6 | 1811 | return ret; |
61c6375d | 1812 | } |
586a87e6 CR |
1813 | |
1814 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1815 | ||
1a2a99c6 AS |
1816 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1817 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1818 | pinctrl_dev_get_devname(pctldev), pin_group); |
1819 | ||
20ec3e39 | 1820 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1821 | |
1822 | return 0; | |
1823 | } | |
1824 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1825 | ||
3f0f8670 LW |
1826 | /** |
1827 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1828 | * @chip: the gpiochip to add the range for | |
1829 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1830 | * @gpio_offset: the start offset in the current gpio_chip number space |
1831 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1832 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1833 | * pin controller) to accumulate in this range | |
1834 | */ | |
1e63d7b9 | 1835 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1836 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1837 | unsigned int npins) |
f23f1516 SH |
1838 | { |
1839 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1840 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1841 | int ret; |
f23f1516 | 1842 | |
3f0f8670 | 1843 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1844 | if (!pin_range) { |
1a2a99c6 | 1845 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1846 | return -ENOMEM; |
f23f1516 SH |
1847 | } |
1848 | ||
3f0f8670 | 1849 | /* Use local offset as range ID */ |
316511c0 | 1850 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1851 | pin_range->range.gc = chip; |
f23f1516 | 1852 | pin_range->range.name = chip->label; |
fdeb8e15 | 1853 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1854 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1855 | pin_range->range.npins = npins; |
192c369c | 1856 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1857 | &pin_range->range); |
8f23ca1a | 1858 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1859 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1860 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1861 | kfree(pin_range); |
b4d4b1f0 | 1862 | return ret; |
3f0f8670 | 1863 | } |
1a2a99c6 AS |
1864 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1865 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1866 | pinctl_name, |
1867 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1868 | |
20ec3e39 | 1869 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1870 | |
1871 | return 0; | |
f23f1516 | 1872 | } |
165adc9c | 1873 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1874 | |
3f0f8670 LW |
1875 | /** |
1876 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1877 | * @chip: the chip to remove all the mappings for | |
1878 | */ | |
f23f1516 SH |
1879 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1880 | { | |
1881 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1882 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1883 | |
20ec3e39 | 1884 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1885 | list_del(&pin_range->node); |
1886 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1887 | &pin_range->range); | |
3f0f8670 | 1888 | kfree(pin_range); |
f23f1516 SH |
1889 | } |
1890 | } | |
165adc9c LW |
1891 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1892 | ||
1893 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1894 | |
d2876d08 DB |
1895 | /* These "optional" allocation calls help prevent drivers from stomping |
1896 | * on each other, and help provide better diagnostics in debugfs. | |
1897 | * They're called even less than the "set direction" calls. | |
1898 | */ | |
77c2d792 | 1899 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1900 | { |
fdeb8e15 | 1901 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1902 | int status; |
d2876d08 DB |
1903 | unsigned long flags; |
1904 | ||
bcabdef1 AC |
1905 | spin_lock_irqsave(&gpio_lock, flags); |
1906 | ||
d2876d08 | 1907 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1908 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1909 | */ |
1910 | ||
1911 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1912 | desc_set_label(desc, label ? : "?"); | |
1913 | status = 0; | |
438d8908 | 1914 | } else { |
d2876d08 | 1915 | status = -EBUSY; |
7460db56 | 1916 | goto done; |
35e8bb51 DB |
1917 | } |
1918 | ||
1919 | if (chip->request) { | |
1920 | /* chip->request may sleep */ | |
1921 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1922 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1923 | spin_lock_irqsave(&gpio_lock, flags); |
1924 | ||
1925 | if (status < 0) { | |
1926 | desc_set_label(desc, NULL); | |
35e8bb51 | 1927 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1928 | goto done; |
35e8bb51 | 1929 | } |
438d8908 | 1930 | } |
80b0a602 MN |
1931 | if (chip->get_direction) { |
1932 | /* chip->get_direction may sleep */ | |
1933 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1934 | gpiod_get_direction(desc); |
80b0a602 MN |
1935 | spin_lock_irqsave(&gpio_lock, flags); |
1936 | } | |
77c2d792 MW |
1937 | done: |
1938 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1939 | return status; | |
1940 | } | |
1941 | ||
fdeb8e15 LW |
1942 | /* |
1943 | * This descriptor validation needs to be inserted verbatim into each | |
1944 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
1945 | * macro to avoid endless duplication. If the desc is NULL it is an |
1946 | * optional GPIO and calls should just bail out. | |
fdeb8e15 LW |
1947 | */ |
1948 | #define VALIDATE_DESC(desc) do { \ | |
54d77198 LW |
1949 | if (!desc) \ |
1950 | return 0; \ | |
bfbbe44d LW |
1951 | if (IS_ERR(desc)) { \ |
1952 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1953 | return PTR_ERR(desc); \ | |
1954 | } \ | |
54d77198 | 1955 | if (!desc->gdev) { \ |
bfbbe44d | 1956 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1957 | return -EINVAL; \ |
1958 | } \ | |
1959 | if ( !desc->gdev->chip ) { \ | |
1960 | dev_warn(&desc->gdev->dev, \ | |
1961 | "%s: backing chip is gone\n", __func__); \ | |
1962 | return 0; \ | |
1963 | } } while (0) | |
1964 | ||
1965 | #define VALIDATE_DESC_VOID(desc) do { \ | |
54d77198 LW |
1966 | if (!desc) \ |
1967 | return; \ | |
bfbbe44d LW |
1968 | if (IS_ERR(desc)) { \ |
1969 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1970 | return; \ | |
1971 | } \ | |
54d77198 | 1972 | if (!desc->gdev) { \ |
bfbbe44d | 1973 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1974 | return; \ |
1975 | } \ | |
1976 | if (!desc->gdev->chip) { \ | |
1977 | dev_warn(&desc->gdev->dev, \ | |
1978 | "%s: backing chip is gone\n", __func__); \ | |
1979 | return; \ | |
1980 | } } while (0) | |
1981 | ||
1982 | ||
0eb4c6c2 | 1983 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1984 | { |
1985 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1986 | struct gpio_device *gdev; |
77c2d792 | 1987 | |
fdeb8e15 LW |
1988 | VALIDATE_DESC(desc); |
1989 | gdev = desc->gdev; | |
77c2d792 | 1990 | |
fdeb8e15 | 1991 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1992 | status = __gpiod_request(desc, label); |
1993 | if (status < 0) | |
fdeb8e15 | 1994 | module_put(gdev->owner); |
33a68e86 LW |
1995 | else |
1996 | get_device(&gdev->dev); | |
77c2d792 MW |
1997 | } |
1998 | ||
d2876d08 | 1999 | if (status) |
7589e59f | 2000 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2001 | |
d2876d08 DB |
2002 | return status; |
2003 | } | |
372e722e | 2004 | |
77c2d792 | 2005 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 2006 | { |
77c2d792 | 2007 | bool ret = false; |
d2876d08 | 2008 | unsigned long flags; |
35e8bb51 | 2009 | struct gpio_chip *chip; |
d2876d08 | 2010 | |
3d599d1c UKK |
2011 | might_sleep(); |
2012 | ||
372e722e | 2013 | gpiod_unexport(desc); |
d8f388d8 | 2014 | |
d2876d08 DB |
2015 | spin_lock_irqsave(&gpio_lock, flags); |
2016 | ||
fdeb8e15 | 2017 | chip = desc->gdev->chip; |
35e8bb51 DB |
2018 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2019 | if (chip->free) { | |
2020 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2021 | might_sleep_if(chip->can_sleep); |
372e722e | 2022 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2023 | spin_lock_irqsave(&gpio_lock, flags); |
2024 | } | |
d2876d08 | 2025 | desc_set_label(desc, NULL); |
07697461 | 2026 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2027 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2028 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2029 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2030 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2031 | ret = true; |
2032 | } | |
d2876d08 DB |
2033 | |
2034 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2035 | return ret; |
2036 | } | |
2037 | ||
0eb4c6c2 | 2038 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2039 | { |
33a68e86 | 2040 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 2041 | module_put(desc->gdev->owner); |
33a68e86 LW |
2042 | put_device(&desc->gdev->dev); |
2043 | } else { | |
77c2d792 | 2044 | WARN_ON(extra_checks); |
33a68e86 | 2045 | } |
d2876d08 | 2046 | } |
372e722e | 2047 | |
d2876d08 DB |
2048 | /** |
2049 | * gpiochip_is_requested - return string iff signal was requested | |
2050 | * @chip: controller managing the signal | |
2051 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2052 | * | |
2053 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2054 | * The string returned is the label passed to gpio_request(); if none has been |
2055 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2056 | * |
2057 | * This function is for use by GPIO controller drivers. The label can | |
2058 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2059 | * can help avoid accidentally multiplexing it to another controller. | |
2060 | */ | |
2061 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2062 | { | |
6c0b4e6c | 2063 | struct gpio_desc *desc; |
d2876d08 | 2064 | |
48b5953e | 2065 | if (offset >= chip->ngpio) |
d2876d08 | 2066 | return NULL; |
6c0b4e6c | 2067 | |
1c3cdb18 | 2068 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2069 | |
372e722e | 2070 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2071 | return NULL; |
372e722e | 2072 | return desc->label; |
d2876d08 DB |
2073 | } |
2074 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2075 | ||
77c2d792 MW |
2076 | /** |
2077 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
2078 | * @desc: GPIO descriptor to request | |
2079 | * @label: label for the GPIO | |
2080 | * | |
2081 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2082 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2083 | * function will not increase reference count of the GPIO chip module. This | |
2084 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2085 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
2086 | */ | |
abdc08a3 AC |
2087 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2088 | const char *label) | |
77c2d792 | 2089 | { |
abdc08a3 AC |
2090 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2091 | int err; | |
77c2d792 | 2092 | |
abdc08a3 AC |
2093 | if (IS_ERR(desc)) { |
2094 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2095 | return desc; | |
2096 | } | |
2097 | ||
2098 | err = __gpiod_request(desc, label); | |
2099 | if (err < 0) | |
2100 | return ERR_PTR(err); | |
77c2d792 | 2101 | |
abdc08a3 | 2102 | return desc; |
77c2d792 | 2103 | } |
f7d4ad98 | 2104 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2105 | |
2106 | /** | |
2107 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2108 | * @desc: GPIO descriptor to free | |
2109 | * | |
2110 | * Function frees the given GPIO requested previously with | |
2111 | * gpiochip_request_own_desc(). | |
2112 | */ | |
2113 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2114 | { | |
2115 | if (desc) | |
2116 | __gpiod_free(desc); | |
2117 | } | |
f7d4ad98 | 2118 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2119 | |
fdeb8e15 LW |
2120 | /* |
2121 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2122 | * some cases this is done in early boot, before IRQs are enabled. |
2123 | * | |
2124 | * As a rule these aren't called more than once (except for drivers | |
2125 | * using the open-drain emulation idiom) so these are natural places | |
2126 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2127 | * rely on gpio_request() having been called beforehand. | |
2128 | */ | |
2129 | ||
79a9becd AC |
2130 | /** |
2131 | * gpiod_direction_input - set the GPIO direction to input | |
2132 | * @desc: GPIO to set to input | |
2133 | * | |
2134 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2135 | * be called safely on it. | |
2136 | * | |
2137 | * Return 0 in case of success, else an error code. | |
2138 | */ | |
2139 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2140 | { |
d2876d08 | 2141 | struct gpio_chip *chip; |
d2876d08 DB |
2142 | int status = -EINVAL; |
2143 | ||
fdeb8e15 LW |
2144 | VALIDATE_DESC(desc); |
2145 | chip = desc->gdev->chip; | |
bcabdef1 | 2146 | |
be1a4b13 | 2147 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2148 | gpiod_warn(desc, |
2149 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2150 | __func__); |
be1a4b13 LW |
2151 | return -EIO; |
2152 | } | |
2153 | ||
d82da797 | 2154 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2155 | if (status == 0) |
2156 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2157 | |
372e722e | 2158 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2159 | |
d2876d08 DB |
2160 | return status; |
2161 | } | |
79a9becd | 2162 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2163 | |
ef70bbe1 | 2164 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 2165 | { |
c663e5f5 LW |
2166 | struct gpio_chip *gc = desc->gdev->chip; |
2167 | int ret; | |
d2876d08 | 2168 | |
d468bf9e LW |
2169 | /* GPIOs used for IRQs shall not be set as output */ |
2170 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
2171 | gpiod_err(desc, | |
2172 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2173 | __func__); | |
2174 | return -EIO; | |
2175 | } | |
2176 | ||
c663e5f5 LW |
2177 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2178 | /* First see if we can enable open drain in hardware */ | |
2179 | if (gc->set_single_ended) { | |
2180 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
2181 | LINE_MODE_OPEN_DRAIN); | |
2182 | if (!ret) | |
2183 | goto set_output_value; | |
2184 | } | |
2185 | /* Emulate open drain by not actively driving the line high */ | |
2186 | if (value) | |
2187 | return gpiod_direction_input(desc); | |
2188 | } | |
2189 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2190 | if (gc->set_single_ended) { | |
2191 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
2192 | LINE_MODE_OPEN_SOURCE); | |
2193 | if (!ret) | |
2194 | goto set_output_value; | |
2195 | } | |
2196 | /* Emulate open source by not actively driving the line low */ | |
2197 | if (!value) | |
2198 | return gpiod_direction_input(desc); | |
2199 | } else { | |
2200 | /* Make sure to disable open drain/source hardware, if any */ | |
2201 | if (gc->set_single_ended) | |
2202 | gc->set_single_ended(gc, | |
2203 | gpio_chip_hwgpio(desc), | |
2204 | LINE_MODE_PUSH_PULL); | |
2205 | } | |
25553ff0 | 2206 | |
c663e5f5 LW |
2207 | set_output_value: |
2208 | if (!gc->set || !gc->direction_output) { | |
6424de5a MB |
2209 | gpiod_warn(desc, |
2210 | "%s: missing set() or direction_output() operations\n", | |
2211 | __func__); | |
be1a4b13 LW |
2212 | return -EIO; |
2213 | } | |
2214 | ||
c663e5f5 LW |
2215 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), value); |
2216 | if (!ret) | |
d2876d08 | 2217 | set_bit(FLAG_IS_OUT, &desc->flags); |
372e722e | 2218 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
c663e5f5 LW |
2219 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2220 | return ret; | |
d2876d08 | 2221 | } |
ef70bbe1 PZ |
2222 | |
2223 | /** | |
2224 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2225 | * @desc: GPIO to set to output | |
2226 | * @value: initial output value of the GPIO | |
2227 | * | |
2228 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2229 | * be called safely on it. The initial value of the output must be specified | |
2230 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2231 | * | |
2232 | * Return 0 in case of success, else an error code. | |
2233 | */ | |
2234 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2235 | { | |
fdeb8e15 | 2236 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2237 | return _gpiod_direction_output_raw(desc, value); |
2238 | } | |
2239 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2240 | ||
2241 | /** | |
90df4fe0 | 2242 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2243 | * @desc: GPIO to set to output |
2244 | * @value: initial output value of the GPIO | |
2245 | * | |
2246 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2247 | * be called safely on it. The initial value of the output must be specified | |
2248 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2249 | * account. | |
2250 | * | |
2251 | * Return 0 in case of success, else an error code. | |
2252 | */ | |
2253 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2254 | { | |
fdeb8e15 | 2255 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2256 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2257 | value = !value; | |
2258 | return _gpiod_direction_output_raw(desc, value); | |
2259 | } | |
79a9becd | 2260 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2261 | |
c4b5be98 | 2262 | /** |
79a9becd | 2263 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
2264 | * @gpio: the gpio to set debounce time |
2265 | * @debounce: debounce time is microseconds | |
65d87656 LW |
2266 | * |
2267 | * returns -ENOTSUPP if the controller does not support setting | |
2268 | * debounce. | |
c4b5be98 | 2269 | */ |
79a9becd | 2270 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2271 | { |
c4b5be98 | 2272 | struct gpio_chip *chip; |
c4b5be98 | 2273 | |
fdeb8e15 LW |
2274 | VALIDATE_DESC(desc); |
2275 | chip = desc->gdev->chip; | |
be1a4b13 | 2276 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
2277 | gpiod_dbg(desc, |
2278 | "%s: missing set() or set_debounce() operations\n", | |
2279 | __func__); | |
65d87656 | 2280 | return -ENOTSUPP; |
be1a4b13 LW |
2281 | } |
2282 | ||
d82da797 | 2283 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 2284 | } |
79a9becd | 2285 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2286 | |
79a9becd AC |
2287 | /** |
2288 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2289 | * @desc: the gpio descriptor to test | |
2290 | * | |
2291 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2292 | */ | |
2293 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2294 | { |
fdeb8e15 | 2295 | VALIDATE_DESC(desc); |
79a9becd | 2296 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2297 | } |
79a9becd | 2298 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2299 | |
2300 | /* I/O calls are only valid after configuration completed; the relevant | |
2301 | * "is this a valid GPIO" error checks should already have been done. | |
2302 | * | |
2303 | * "Get" operations are often inlinable as reading a pin value register, | |
2304 | * and masking the relevant bit in that register. | |
2305 | * | |
2306 | * When "set" operations are inlinable, they involve writing that mask to | |
2307 | * one register to set a low value, or a different register to set it high. | |
2308 | * Otherwise locking is needed, so there may be little value to inlining. | |
2309 | * | |
2310 | *------------------------------------------------------------------------ | |
2311 | * | |
2312 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2313 | * have requested the GPIO. That can include implicit requesting by | |
2314 | * a direction setting call. Marking a gpio as requested locks its chip | |
2315 | * in memory, guaranteeing that these table lookups need no more locking | |
2316 | * and that gpiochip_remove() will fail. | |
2317 | * | |
2318 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2319 | * that the GPIO was actually requested. | |
2320 | */ | |
2321 | ||
e20538b8 | 2322 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
2323 | { |
2324 | struct gpio_chip *chip; | |
372e722e | 2325 | int offset; |
e20538b8 | 2326 | int value; |
d2876d08 | 2327 | |
fdeb8e15 | 2328 | chip = desc->gdev->chip; |
372e722e | 2329 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2330 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2331 | value = value < 0 ? value : !!value; |
372e722e | 2332 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2333 | return value; |
d2876d08 | 2334 | } |
372e722e | 2335 | |
d2876d08 | 2336 | /** |
79a9becd AC |
2337 | * gpiod_get_raw_value() - return a gpio's raw value |
2338 | * @desc: gpio whose value will be returned | |
d2876d08 | 2339 | * |
79a9becd | 2340 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2341 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2342 | * |
2343 | * This function should be called from contexts where we cannot sleep, and will | |
2344 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2345 | */ |
79a9becd | 2346 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2347 | { |
fdeb8e15 | 2348 | VALIDATE_DESC(desc); |
e4e449e8 | 2349 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2350 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2351 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2352 | } |
79a9becd | 2353 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2354 | |
79a9becd AC |
2355 | /** |
2356 | * gpiod_get_value() - return a gpio's value | |
2357 | * @desc: gpio whose value will be returned | |
2358 | * | |
2359 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2360 | * account, or negative errno on failure. |
79a9becd AC |
2361 | * |
2362 | * This function should be called from contexts where we cannot sleep, and will | |
2363 | * complain if the GPIO chip functions potentially sleep. | |
2364 | */ | |
2365 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2366 | { |
79a9becd | 2367 | int value; |
fdeb8e15 LW |
2368 | |
2369 | VALIDATE_DESC(desc); | |
79a9becd | 2370 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2371 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2372 | |
2373 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
2374 | if (value < 0) |
2375 | return value; | |
2376 | ||
79a9becd AC |
2377 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2378 | value = !value; | |
2379 | ||
2380 | return value; | |
372e722e | 2381 | } |
79a9becd | 2382 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2383 | |
aca5ce14 LD |
2384 | /* |
2385 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 2386 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 2387 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 2388 | */ |
23600969 | 2389 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
2390 | { |
2391 | int err = 0; | |
fdeb8e15 | 2392 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2393 | int offset = gpio_chip_hwgpio(desc); |
2394 | ||
aca5ce14 | 2395 | if (value) { |
372e722e | 2396 | err = chip->direction_input(chip, offset); |
aca5ce14 | 2397 | if (!err) |
372e722e | 2398 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2399 | } else { |
372e722e | 2400 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 2401 | if (!err) |
372e722e | 2402 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2403 | } |
372e722e | 2404 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 2405 | if (err < 0) |
6424de5a MB |
2406 | gpiod_err(desc, |
2407 | "%s: Error in set_value for open drain err %d\n", | |
2408 | __func__, err); | |
aca5ce14 LD |
2409 | } |
2410 | ||
25553ff0 | 2411 | /* |
79a9becd AC |
2412 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
2413 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 2414 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 2415 | */ |
23600969 | 2416 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
2417 | { |
2418 | int err = 0; | |
fdeb8e15 | 2419 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2420 | int offset = gpio_chip_hwgpio(desc); |
2421 | ||
25553ff0 | 2422 | if (value) { |
372e722e | 2423 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 2424 | if (!err) |
372e722e | 2425 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2426 | } else { |
372e722e | 2427 | err = chip->direction_input(chip, offset); |
25553ff0 | 2428 | if (!err) |
372e722e | 2429 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2430 | } |
372e722e | 2431 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 2432 | if (err < 0) |
6424de5a MB |
2433 | gpiod_err(desc, |
2434 | "%s: Error in set_value for open source err %d\n", | |
2435 | __func__, err); | |
25553ff0 LD |
2436 | } |
2437 | ||
23600969 | 2438 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
2439 | { |
2440 | struct gpio_chip *chip; | |
2441 | ||
fdeb8e15 | 2442 | chip = desc->gdev->chip; |
372e722e AC |
2443 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
2444 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
2445 | _gpio_set_open_drain_value(desc, value); | |
2446 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
2447 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 2448 | else |
372e722e AC |
2449 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
2450 | } | |
2451 | ||
5f424243 RI |
2452 | /* |
2453 | * set multiple outputs on the same chip; | |
2454 | * use the chip's set_multiple function if available; | |
2455 | * otherwise set the outputs sequentially; | |
2456 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
2457 | * defines which outputs are to be changed | |
2458 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
2459 | * defines the values the outputs specified by mask are to be set to | |
2460 | */ | |
2461 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
2462 | unsigned long *mask, unsigned long *bits) | |
2463 | { | |
2464 | if (chip->set_multiple) { | |
2465 | chip->set_multiple(chip, mask, bits); | |
2466 | } else { | |
2467 | int i; | |
2468 | for (i = 0; i < chip->ngpio; i++) { | |
2469 | if (mask[BIT_WORD(i)] == 0) { | |
2470 | /* no more set bits in this mask word; | |
2471 | * skip ahead to the next word */ | |
2472 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
2473 | continue; | |
2474 | } | |
2475 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 2476 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 2477 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
2478 | } |
2479 | } | |
2480 | } | |
2481 | ||
44c7288f LW |
2482 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
2483 | unsigned int array_size, | |
2484 | struct gpio_desc **desc_array, | |
2485 | int *value_array) | |
5f424243 RI |
2486 | { |
2487 | int i = 0; | |
2488 | ||
2489 | while (i < array_size) { | |
fdeb8e15 | 2490 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
2491 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
2492 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
2493 | int count = 0; | |
2494 | ||
38e003f4 | 2495 | if (!can_sleep) |
5f424243 | 2496 | WARN_ON(chip->can_sleep); |
38e003f4 | 2497 | |
5f424243 RI |
2498 | memset(mask, 0, sizeof(mask)); |
2499 | do { | |
2500 | struct gpio_desc *desc = desc_array[i]; | |
2501 | int hwgpio = gpio_chip_hwgpio(desc); | |
2502 | int value = value_array[i]; | |
2503 | ||
2504 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2505 | value = !value; | |
2506 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
2507 | /* | |
2508 | * collect all normal outputs belonging to the same chip | |
2509 | * open drain and open source outputs are set individually | |
2510 | */ | |
2511 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 2512 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
2513 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
2514 | _gpio_set_open_source_value(desc, value); | |
2515 | } else { | |
2516 | __set_bit(hwgpio, mask); | |
38e003f4 | 2517 | if (value) |
5f424243 | 2518 | __set_bit(hwgpio, bits); |
38e003f4 | 2519 | else |
5f424243 | 2520 | __clear_bit(hwgpio, bits); |
5f424243 RI |
2521 | count++; |
2522 | } | |
2523 | i++; | |
fdeb8e15 LW |
2524 | } while ((i < array_size) && |
2525 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 2526 | /* push collected bits to outputs */ |
38e003f4 | 2527 | if (count != 0) |
5f424243 | 2528 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
2529 | } |
2530 | } | |
2531 | ||
d2876d08 | 2532 | /** |
79a9becd AC |
2533 | * gpiod_set_raw_value() - assign a gpio's raw value |
2534 | * @desc: gpio whose value will be assigned | |
d2876d08 | 2535 | * @value: value to assign |
d2876d08 | 2536 | * |
79a9becd AC |
2537 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
2538 | * regard for its ACTIVE_LOW status. | |
2539 | * | |
2540 | * This function should be called from contexts where we cannot sleep, and will | |
2541 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2542 | */ |
79a9becd | 2543 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 2544 | { |
fdeb8e15 | 2545 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2546 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2547 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2548 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 2549 | } |
79a9becd | 2550 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
2551 | |
2552 | /** | |
79a9becd AC |
2553 | * gpiod_set_value() - assign a gpio's value |
2554 | * @desc: gpio whose value will be assigned | |
2555 | * @value: value to assign | |
2556 | * | |
2557 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2558 | * account | |
d2876d08 | 2559 | * |
79a9becd AC |
2560 | * This function should be called from contexts where we cannot sleep, and will |
2561 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2562 | */ |
79a9becd | 2563 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 2564 | { |
fdeb8e15 | 2565 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2566 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2567 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2568 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2569 | value = !value; | |
2570 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2571 | } |
79a9becd | 2572 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 2573 | |
5f424243 | 2574 | /** |
3fff99bc | 2575 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2576 | * @array_size: number of elements in the descriptor / value arrays |
2577 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2578 | * @value_array: array of values to assign | |
2579 | * | |
2580 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2581 | * without regard for their ACTIVE_LOW status. | |
2582 | * | |
2583 | * This function should be called from contexts where we cannot sleep, and will | |
2584 | * complain if the GPIO chip functions potentially sleep. | |
2585 | */ | |
3fff99bc | 2586 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
2587 | struct gpio_desc **desc_array, int *value_array) |
2588 | { | |
2589 | if (!desc_array) | |
2590 | return; | |
44c7288f LW |
2591 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
2592 | value_array); | |
5f424243 | 2593 | } |
3fff99bc | 2594 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
2595 | |
2596 | /** | |
3fff99bc | 2597 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2598 | * @array_size: number of elements in the descriptor / value arrays |
2599 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2600 | * @value_array: array of values to assign | |
2601 | * | |
2602 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2603 | * into account. | |
2604 | * | |
2605 | * This function should be called from contexts where we cannot sleep, and will | |
2606 | * complain if the GPIO chip functions potentially sleep. | |
2607 | */ | |
3fff99bc RI |
2608 | void gpiod_set_array_value(unsigned int array_size, |
2609 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2610 | { |
2611 | if (!desc_array) | |
2612 | return; | |
44c7288f LW |
2613 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2614 | value_array); | |
5f424243 | 2615 | } |
3fff99bc | 2616 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2617 | |
d2876d08 | 2618 | /** |
79a9becd AC |
2619 | * gpiod_cansleep() - report whether gpio value access may sleep |
2620 | * @desc: gpio to check | |
d2876d08 | 2621 | * |
d2876d08 | 2622 | */ |
79a9becd | 2623 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2624 | { |
fdeb8e15 LW |
2625 | VALIDATE_DESC(desc); |
2626 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2627 | } |
79a9becd | 2628 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2629 | |
0f6d504e | 2630 | /** |
79a9becd AC |
2631 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2632 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2633 | * |
79a9becd AC |
2634 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2635 | * error. | |
0f6d504e | 2636 | */ |
79a9becd | 2637 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2638 | { |
4c37ce86 LW |
2639 | struct gpio_chip *chip; |
2640 | int offset; | |
0f6d504e | 2641 | |
79bb71bd LW |
2642 | /* |
2643 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
2644 | * requires this function to not return zero on an invalid descriptor | |
2645 | * but rather a negative error number. | |
2646 | */ | |
bfbbe44d | 2647 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
2648 | return -EINVAL; |
2649 | ||
fdeb8e15 | 2650 | chip = desc->gdev->chip; |
372e722e | 2651 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
2652 | if (chip->to_irq) { |
2653 | int retirq = chip->to_irq(chip, offset); | |
2654 | ||
2655 | /* Zero means NO_IRQ */ | |
2656 | if (!retirq) | |
2657 | return -ENXIO; | |
2658 | ||
2659 | return retirq; | |
2660 | } | |
2661 | return -ENXIO; | |
0f6d504e | 2662 | } |
79a9becd | 2663 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 2664 | |
d468bf9e | 2665 | /** |
e3a2e878 | 2666 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
2667 | * @chip: the chip the GPIO to lock belongs to |
2668 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2669 | * |
2670 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 2671 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 2672 | */ |
e3a2e878 | 2673 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 2674 | { |
9c10280d LW |
2675 | struct gpio_desc *desc; |
2676 | ||
2677 | desc = gpiochip_get_desc(chip, offset); | |
2678 | if (IS_ERR(desc)) | |
2679 | return PTR_ERR(desc); | |
2680 | ||
2681 | /* Flush direction if something changed behind our back */ | |
2682 | if (chip->get_direction) { | |
2683 | int dir = chip->get_direction(chip, offset); | |
2684 | ||
2685 | if (dir) | |
2686 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
2687 | else | |
2688 | set_bit(FLAG_IS_OUT, &desc->flags); | |
2689 | } | |
d468bf9e | 2690 | |
9c10280d | 2691 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 2692 | chip_err(chip, |
d468bf9e LW |
2693 | "%s: tried to flag a GPIO set as output for IRQ\n", |
2694 | __func__); | |
2695 | return -EIO; | |
2696 | } | |
2697 | ||
9c10280d | 2698 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
d468bf9e | 2699 | return 0; |
372e722e | 2700 | } |
e3a2e878 | 2701 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 2702 | |
d468bf9e | 2703 | /** |
e3a2e878 | 2704 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
2705 | * @chip: the chip the GPIO to lock belongs to |
2706 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2707 | * |
2708 | * This is used directly by GPIO drivers that want to indicate | |
2709 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 2710 | */ |
e3a2e878 | 2711 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 2712 | { |
d74be6df | 2713 | if (offset >= chip->ngpio) |
d468bf9e | 2714 | return; |
d2876d08 | 2715 | |
1c3cdb18 | 2716 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 2717 | } |
e3a2e878 | 2718 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 2719 | |
6cee3821 LW |
2720 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
2721 | { | |
2722 | if (offset >= chip->ngpio) | |
2723 | return false; | |
2724 | ||
2725 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
2726 | } | |
2727 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
2728 | ||
143b65d6 LW |
2729 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
2730 | { | |
2731 | if (offset >= chip->ngpio) | |
2732 | return false; | |
2733 | ||
2734 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
2735 | } | |
2736 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
2737 | ||
2738 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
2739 | { | |
2740 | if (offset >= chip->ngpio) | |
2741 | return false; | |
2742 | ||
2743 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
2744 | } | |
2745 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
2746 | ||
79a9becd AC |
2747 | /** |
2748 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2749 | * @desc: gpio whose value will be returned | |
2750 | * | |
2751 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 2752 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2753 | * |
2754 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2755 | */ |
79a9becd | 2756 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2757 | { |
d2876d08 | 2758 | might_sleep_if(extra_checks); |
fdeb8e15 | 2759 | VALIDATE_DESC(desc); |
79a9becd | 2760 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2761 | } |
79a9becd | 2762 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2763 | |
79a9becd AC |
2764 | /** |
2765 | * gpiod_get_value_cansleep() - return a gpio's value | |
2766 | * @desc: gpio whose value will be returned | |
2767 | * | |
2768 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2769 | * account, or negative errno on failure. |
79a9becd AC |
2770 | * |
2771 | * This function is to be called from contexts that can sleep. | |
2772 | */ | |
2773 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2774 | { |
3f397c21 | 2775 | int value; |
d2876d08 DB |
2776 | |
2777 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2778 | VALIDATE_DESC(desc); |
79a9becd | 2779 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
2780 | if (value < 0) |
2781 | return value; | |
2782 | ||
79a9becd AC |
2783 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2784 | value = !value; | |
2785 | ||
3f397c21 | 2786 | return value; |
d2876d08 | 2787 | } |
79a9becd | 2788 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2789 | |
79a9becd AC |
2790 | /** |
2791 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2792 | * @desc: gpio whose value will be assigned | |
2793 | * @value: value to assign | |
2794 | * | |
2795 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2796 | * regard for its ACTIVE_LOW status. | |
2797 | * | |
2798 | * This function is to be called from contexts that can sleep. | |
2799 | */ | |
2800 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2801 | { |
d2876d08 | 2802 | might_sleep_if(extra_checks); |
fdeb8e15 | 2803 | VALIDATE_DESC_VOID(desc); |
79a9becd | 2804 | _gpiod_set_raw_value(desc, value); |
372e722e | 2805 | } |
79a9becd | 2806 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2807 | |
79a9becd AC |
2808 | /** |
2809 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2810 | * @desc: gpio whose value will be assigned | |
2811 | * @value: value to assign | |
2812 | * | |
2813 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2814 | * account | |
2815 | * | |
2816 | * This function is to be called from contexts that can sleep. | |
2817 | */ | |
2818 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2819 | { |
d2876d08 | 2820 | might_sleep_if(extra_checks); |
fdeb8e15 | 2821 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2822 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2823 | value = !value; | |
2824 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2825 | } |
79a9becd | 2826 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2827 | |
5f424243 | 2828 | /** |
3fff99bc | 2829 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2830 | * @array_size: number of elements in the descriptor / value arrays |
2831 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2832 | * @value_array: array of values to assign | |
2833 | * | |
2834 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2835 | * without regard for their ACTIVE_LOW status. | |
2836 | * | |
2837 | * This function is to be called from contexts that can sleep. | |
2838 | */ | |
3fff99bc RI |
2839 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2840 | struct gpio_desc **desc_array, | |
2841 | int *value_array) | |
5f424243 RI |
2842 | { |
2843 | might_sleep_if(extra_checks); | |
2844 | if (!desc_array) | |
2845 | return; | |
44c7288f LW |
2846 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
2847 | value_array); | |
5f424243 | 2848 | } |
3fff99bc | 2849 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2850 | |
2851 | /** | |
3fff99bc | 2852 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2853 | * @array_size: number of elements in the descriptor / value arrays |
2854 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2855 | * @value_array: array of values to assign | |
2856 | * | |
2857 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2858 | * into account. | |
2859 | * | |
2860 | * This function is to be called from contexts that can sleep. | |
2861 | */ | |
3fff99bc RI |
2862 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2863 | struct gpio_desc **desc_array, | |
2864 | int *value_array) | |
5f424243 RI |
2865 | { |
2866 | might_sleep_if(extra_checks); | |
2867 | if (!desc_array) | |
2868 | return; | |
44c7288f LW |
2869 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
2870 | value_array); | |
5f424243 | 2871 | } |
3fff99bc | 2872 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2873 | |
bae48da2 | 2874 | /** |
ad824783 AC |
2875 | * gpiod_add_lookup_table() - register GPIO device consumers |
2876 | * @table: table of consumers to register | |
bae48da2 | 2877 | */ |
ad824783 | 2878 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2879 | { |
2880 | mutex_lock(&gpio_lookup_lock); | |
2881 | ||
ad824783 | 2882 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2883 | |
2884 | mutex_unlock(&gpio_lookup_lock); | |
2885 | } | |
2886 | ||
be9015ab SK |
2887 | /** |
2888 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2889 | * @table: table of consumers to unregister | |
2890 | */ | |
2891 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2892 | { | |
2893 | mutex_lock(&gpio_lookup_lock); | |
2894 | ||
2895 | list_del(&table->list); | |
2896 | ||
2897 | mutex_unlock(&gpio_lookup_lock); | |
2898 | } | |
2899 | ||
ad824783 | 2900 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2901 | { |
2902 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2903 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2904 | |
2905 | mutex_lock(&gpio_lookup_lock); | |
2906 | ||
ad824783 AC |
2907 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2908 | if (table->dev_id && dev_id) { | |
2909 | /* | |
2910 | * Valid strings on both ends, must be identical to have | |
2911 | * a match | |
2912 | */ | |
2913 | if (!strcmp(table->dev_id, dev_id)) | |
2914 | goto found; | |
2915 | } else { | |
2916 | /* | |
2917 | * One of the pointers is NULL, so both must be to have | |
2918 | * a match | |
2919 | */ | |
2920 | if (dev_id == table->dev_id) | |
2921 | goto found; | |
2922 | } | |
2923 | } | |
2924 | table = NULL; | |
bae48da2 | 2925 | |
ad824783 AC |
2926 | found: |
2927 | mutex_unlock(&gpio_lookup_lock); | |
2928 | return table; | |
2929 | } | |
bae48da2 | 2930 | |
ad824783 AC |
2931 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2932 | unsigned int idx, | |
2933 | enum gpio_lookup_flags *flags) | |
2934 | { | |
2a3cf6a3 | 2935 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2936 | struct gpiod_lookup_table *table; |
2937 | struct gpiod_lookup *p; | |
bae48da2 | 2938 | |
ad824783 AC |
2939 | table = gpiod_find_lookup_table(dev); |
2940 | if (!table) | |
2941 | return desc; | |
bae48da2 | 2942 | |
ad824783 AC |
2943 | for (p = &table->table[0]; p->chip_label; p++) { |
2944 | struct gpio_chip *chip; | |
bae48da2 | 2945 | |
ad824783 | 2946 | /* idx must always match exactly */ |
bae48da2 AC |
2947 | if (p->idx != idx) |
2948 | continue; | |
2949 | ||
ad824783 AC |
2950 | /* If the lookup entry has a con_id, require exact match */ |
2951 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2952 | continue; | |
bae48da2 | 2953 | |
ad824783 | 2954 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2955 | |
ad824783 | 2956 | if (!chip) { |
2a3cf6a3 AC |
2957 | dev_err(dev, "cannot find GPIO chip %s\n", |
2958 | p->chip_label); | |
2959 | return ERR_PTR(-ENODEV); | |
ad824783 | 2960 | } |
bae48da2 | 2961 | |
ad824783 | 2962 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2963 | dev_err(dev, |
2964 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2965 | idx, chip->ngpio, chip->label); | |
2966 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2967 | } |
bae48da2 | 2968 | |
bb1e88cc | 2969 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2970 | *flags = p->flags; |
bae48da2 | 2971 | |
2a3cf6a3 | 2972 | return desc; |
bae48da2 AC |
2973 | } |
2974 | ||
bae48da2 AC |
2975 | return desc; |
2976 | } | |
2977 | ||
66858527 RI |
2978 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2979 | { | |
2980 | int ret; | |
2981 | char propname[32]; | |
2982 | unsigned int i; | |
2983 | ||
2984 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2985 | if (con_id) | |
2986 | snprintf(propname, sizeof(propname), "%s-%s", | |
2987 | con_id, gpio_suffixes[i]); | |
2988 | else | |
2989 | snprintf(propname, sizeof(propname), "%s", | |
2990 | gpio_suffixes[i]); | |
2991 | ||
2992 | ret = of_gpio_named_count(dev->of_node, propname); | |
2993 | if (ret >= 0) | |
2994 | break; | |
2995 | } | |
2996 | return ret; | |
2997 | } | |
2998 | ||
2999 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3000 | { | |
3001 | struct gpiod_lookup_table *table; | |
3002 | struct gpiod_lookup *p; | |
3003 | unsigned int count = 0; | |
3004 | ||
3005 | table = gpiod_find_lookup_table(dev); | |
3006 | if (!table) | |
3007 | return -ENOENT; | |
3008 | ||
3009 | for (p = &table->table[0]; p->chip_label; p++) { | |
3010 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3011 | (!con_id && !p->con_id)) | |
3012 | count++; | |
3013 | } | |
3014 | if (!count) | |
3015 | return -ENOENT; | |
3016 | ||
3017 | return count; | |
3018 | } | |
3019 | ||
3020 | /** | |
3021 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3022 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3023 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3024 | * @con_id: function within the GPIO consumer | |
3025 | */ | |
3026 | int gpiod_count(struct device *dev, const char *con_id) | |
3027 | { | |
3028 | int count = -ENOENT; | |
3029 | ||
3030 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3031 | count = dt_gpio_count(dev, con_id); | |
3032 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3033 | count = acpi_gpio_count(dev, con_id); | |
3034 | ||
3035 | if (count < 0) | |
3036 | count = platform_gpio_count(dev, con_id); | |
3037 | ||
3038 | return count; | |
3039 | } | |
3040 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3041 | ||
bae48da2 | 3042 | /** |
0879162f | 3043 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3044 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3045 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3046 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3047 | * |
3048 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3049 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3050 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3051 | */ |
b17d1bf1 | 3052 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3053 | enum gpiod_flags flags) |
bae48da2 | 3054 | { |
39b2bbe3 | 3055 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3056 | } |
b17d1bf1 | 3057 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3058 | |
29a1f233 TR |
3059 | /** |
3060 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3061 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3062 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3063 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3064 | * |
3065 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3066 | * the requested function it will return NULL. This is convenient for drivers | |
3067 | * that need to handle optional GPIOs. | |
3068 | */ | |
b17d1bf1 | 3069 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3070 | const char *con_id, |
3071 | enum gpiod_flags flags) | |
29a1f233 | 3072 | { |
39b2bbe3 | 3073 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3074 | } |
b17d1bf1 | 3075 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3076 | |
f625d460 BP |
3077 | |
3078 | /** | |
3079 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3080 | * @desc: gpio whose value will be assigned | |
3081 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3082 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3083 | * of_get_gpio_hog() | |
f625d460 BP |
3084 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3085 | * | |
3086 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3087 | * requested function and/or index, or another IS_ERR() code if an error | |
3088 | * occurred while trying to acquire the GPIO. | |
3089 | */ | |
3090 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
85b03b30 | 3091 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3092 | { |
3093 | int status; | |
3094 | ||
85b03b30 JH |
3095 | if (lflags & GPIO_ACTIVE_LOW) |
3096 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3097 | if (lflags & GPIO_OPEN_DRAIN) | |
3098 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3099 | if (lflags & GPIO_OPEN_SOURCE) | |
3100 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
3101 | ||
f625d460 BP |
3102 | /* No particular flag request, return here... */ |
3103 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
3104 | pr_debug("no flags found for %s\n", con_id); | |
3105 | return 0; | |
3106 | } | |
3107 | ||
3108 | /* Process flags */ | |
3109 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
3110 | status = gpiod_direction_output(desc, | |
3111 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
3112 | else | |
3113 | status = gpiod_direction_input(desc); | |
3114 | ||
3115 | return status; | |
3116 | } | |
3117 | ||
bae48da2 AC |
3118 | /** |
3119 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 3120 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
3121 | * @con_id: function within the GPIO consumer |
3122 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3123 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3124 | * |
3125 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
3126 | * defined one for functions that define several GPIOs. | |
3127 | * | |
2a3cf6a3 AC |
3128 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
3129 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 3130 | * occurred while trying to acquire the GPIO. |
bae48da2 | 3131 | */ |
b17d1bf1 | 3132 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 3133 | const char *con_id, |
39b2bbe3 AC |
3134 | unsigned int idx, |
3135 | enum gpiod_flags flags) | |
bae48da2 | 3136 | { |
35c5d7fd | 3137 | struct gpio_desc *desc = NULL; |
bae48da2 | 3138 | int status; |
39b2bbe3 | 3139 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
3140 | |
3141 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
3142 | ||
4d8440b9 RW |
3143 | if (dev) { |
3144 | /* Using device tree? */ | |
3145 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
3146 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
3147 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
3148 | } else if (ACPI_COMPANION(dev)) { | |
3149 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
25487533 | 3150 | desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); |
4d8440b9 | 3151 | } |
35c5d7fd AC |
3152 | } |
3153 | ||
3154 | /* | |
3155 | * Either we are not using DT or ACPI, or their lookup did not return | |
3156 | * a result. In that case, use platform lookup as a fallback. | |
3157 | */ | |
2a3cf6a3 | 3158 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 3159 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 3160 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
3161 | } |
3162 | ||
3163 | if (IS_ERR(desc)) { | |
351cfe0f | 3164 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
3165 | return desc; |
3166 | } | |
3167 | ||
3168 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
3169 | if (status < 0) |
3170 | return ERR_PTR(status); | |
3171 | ||
85b03b30 | 3172 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
3173 | if (status < 0) { |
3174 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
3175 | gpiod_put(desc); | |
3176 | return ERR_PTR(status); | |
3177 | } | |
3178 | ||
bae48da2 AC |
3179 | return desc; |
3180 | } | |
b17d1bf1 | 3181 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 3182 | |
40b73183 MW |
3183 | /** |
3184 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
3185 | * @fwnode: handle of the firmware node | |
3186 | * @propname: name of the firmware property representing the GPIO | |
3187 | * | |
3188 | * This function can be used for drivers that get their configuration | |
3189 | * from firmware. | |
3190 | * | |
3191 | * Function properly finds the corresponding GPIO using whatever is the | |
3192 | * underlying firmware interface and then makes sure that the GPIO | |
3193 | * descriptor is requested before it is returned to the caller. | |
3194 | * | |
3195 | * In case of error an ERR_PTR() is returned. | |
3196 | */ | |
3197 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
3198 | const char *propname) | |
3199 | { | |
3200 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
3201 | bool active_low = false; | |
90b665f6 | 3202 | bool single_ended = false; |
40b73183 MW |
3203 | int ret; |
3204 | ||
3205 | if (!fwnode) | |
3206 | return ERR_PTR(-EINVAL); | |
3207 | ||
3208 | if (is_of_node(fwnode)) { | |
3209 | enum of_gpio_flags flags; | |
3210 | ||
c181fb3e | 3211 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 3212 | &flags); |
90b665f6 | 3213 | if (!IS_ERR(desc)) { |
40b73183 | 3214 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
3215 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
3216 | } | |
40b73183 MW |
3217 | } else if (is_acpi_node(fwnode)) { |
3218 | struct acpi_gpio_info info; | |
3219 | ||
504a3374 | 3220 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 3221 | if (!IS_ERR(desc)) |
52044723 | 3222 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
3223 | } |
3224 | ||
3225 | if (IS_ERR(desc)) | |
3226 | return desc; | |
3227 | ||
85b03b30 JH |
3228 | ret = gpiod_request(desc, NULL); |
3229 | if (ret) | |
3230 | return ERR_PTR(ret); | |
3231 | ||
40b73183 MW |
3232 | if (active_low) |
3233 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3234 | ||
90b665f6 LP |
3235 | if (single_ended) { |
3236 | if (active_low) | |
3237 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3238 | else | |
3239 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
3240 | } | |
3241 | ||
40b73183 MW |
3242 | return desc; |
3243 | } | |
3244 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
3245 | ||
29a1f233 TR |
3246 | /** |
3247 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
3248 | * function | |
3249 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3250 | * @con_id: function within the GPIO consumer | |
3251 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3252 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3253 | * |
3254 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
3255 | * specified index was assigned to the requested function it will return NULL. | |
3256 | * This is convenient for drivers that need to handle optional GPIOs. | |
3257 | */ | |
b17d1bf1 | 3258 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 3259 | const char *con_id, |
39b2bbe3 AC |
3260 | unsigned int index, |
3261 | enum gpiod_flags flags) | |
29a1f233 TR |
3262 | { |
3263 | struct gpio_desc *desc; | |
3264 | ||
39b2bbe3 | 3265 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
3266 | if (IS_ERR(desc)) { |
3267 | if (PTR_ERR(desc) == -ENOENT) | |
3268 | return NULL; | |
3269 | } | |
3270 | ||
3271 | return desc; | |
3272 | } | |
b17d1bf1 | 3273 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 3274 | |
f625d460 BP |
3275 | /** |
3276 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
3277 | * @desc: gpio whose value will be assigned | |
3278 | * @name: gpio line name | |
3279 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
3280 | * of_get_gpio_hog() | |
3281 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
3282 | */ | |
3283 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
3284 | unsigned long lflags, enum gpiod_flags dflags) | |
3285 | { | |
3286 | struct gpio_chip *chip; | |
3287 | struct gpio_desc *local_desc; | |
3288 | int hwnum; | |
3289 | int status; | |
3290 | ||
3291 | chip = gpiod_to_chip(desc); | |
3292 | hwnum = gpio_chip_hwgpio(desc); | |
3293 | ||
3294 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
3295 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
3296 | status = PTR_ERR(local_desc); |
3297 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
3298 | name, chip->label, hwnum, status); | |
3299 | return status; | |
f625d460 BP |
3300 | } |
3301 | ||
85b03b30 | 3302 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 3303 | if (status < 0) { |
c31a571d LD |
3304 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
3305 | name, chip->label, hwnum, status); | |
f625d460 BP |
3306 | gpiochip_free_own_desc(desc); |
3307 | return status; | |
3308 | } | |
3309 | ||
3310 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
3311 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
3312 | ||
3313 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
3314 | desc_to_gpio(desc), name, | |
3315 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
3316 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
3317 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
3318 | ||
3319 | return 0; | |
3320 | } | |
3321 | ||
3322 | /** | |
3323 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
3324 | * @chip: gpio chip to act on | |
3325 | * | |
3326 | * This is only used by of_gpiochip_remove to free hogged gpios | |
3327 | */ | |
3328 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
3329 | { | |
3330 | int id; | |
3331 | ||
3332 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
3333 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
3334 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
3335 | } |
3336 | } | |
3337 | ||
66858527 RI |
3338 | /** |
3339 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
3340 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3341 | * @con_id: function within the GPIO consumer | |
3342 | * @flags: optional GPIO initialization flags | |
3343 | * | |
3344 | * This function acquires all the GPIOs defined under a given function. | |
3345 | * | |
3346 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
3347 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
3348 | * code if an error occurred while trying to acquire the GPIOs. | |
3349 | */ | |
3350 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
3351 | const char *con_id, | |
3352 | enum gpiod_flags flags) | |
3353 | { | |
3354 | struct gpio_desc *desc; | |
3355 | struct gpio_descs *descs; | |
3356 | int count; | |
3357 | ||
3358 | count = gpiod_count(dev, con_id); | |
3359 | if (count < 0) | |
3360 | return ERR_PTR(count); | |
3361 | ||
3362 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
3363 | GFP_KERNEL); | |
3364 | if (!descs) | |
3365 | return ERR_PTR(-ENOMEM); | |
3366 | ||
3367 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
3368 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
3369 | if (IS_ERR(desc)) { | |
3370 | gpiod_put_array(descs); | |
3371 | return ERR_CAST(desc); | |
3372 | } | |
3373 | descs->desc[descs->ndescs] = desc; | |
3374 | descs->ndescs++; | |
3375 | } | |
3376 | return descs; | |
3377 | } | |
3378 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
3379 | ||
3380 | /** | |
3381 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
3382 | * function | |
3383 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3384 | * @con_id: function within the GPIO consumer | |
3385 | * @flags: optional GPIO initialization flags | |
3386 | * | |
3387 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
3388 | * assigned to the requested function it will return NULL. | |
3389 | */ | |
3390 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
3391 | const char *con_id, | |
3392 | enum gpiod_flags flags) | |
3393 | { | |
3394 | struct gpio_descs *descs; | |
3395 | ||
3396 | descs = gpiod_get_array(dev, con_id, flags); | |
3397 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
3398 | return NULL; | |
3399 | ||
3400 | return descs; | |
3401 | } | |
3402 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
3403 | ||
bae48da2 AC |
3404 | /** |
3405 | * gpiod_put - dispose of a GPIO descriptor | |
3406 | * @desc: GPIO descriptor to dispose of | |
3407 | * | |
3408 | * No descriptor can be used after gpiod_put() has been called on it. | |
3409 | */ | |
3410 | void gpiod_put(struct gpio_desc *desc) | |
3411 | { | |
3412 | gpiod_free(desc); | |
372e722e | 3413 | } |
bae48da2 | 3414 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 3415 | |
66858527 RI |
3416 | /** |
3417 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
3418 | * @descs: struct gpio_descs containing an array of descriptors | |
3419 | */ | |
3420 | void gpiod_put_array(struct gpio_descs *descs) | |
3421 | { | |
3422 | unsigned int i; | |
3423 | ||
3424 | for (i = 0; i < descs->ndescs; i++) | |
3425 | gpiod_put(descs->desc[i]); | |
3426 | ||
3427 | kfree(descs); | |
3428 | } | |
3429 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
3430 | ||
3c702e99 LW |
3431 | static int __init gpiolib_dev_init(void) |
3432 | { | |
3433 | int ret; | |
3434 | ||
3435 | /* Register GPIO sysfs bus */ | |
3436 | ret = bus_register(&gpio_bus_type); | |
3437 | if (ret < 0) { | |
3438 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
3439 | return ret; | |
3440 | } | |
3441 | ||
3442 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
3443 | if (ret < 0) { | |
3444 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
3445 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
3446 | } else { |
3447 | gpiolib_initialized = true; | |
3448 | gpiochip_setup_devs(); | |
3c702e99 LW |
3449 | } |
3450 | return ret; | |
3451 | } | |
3452 | core_initcall(gpiolib_dev_init); | |
3453 | ||
d2876d08 DB |
3454 | #ifdef CONFIG_DEBUG_FS |
3455 | ||
fdeb8e15 | 3456 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
3457 | { |
3458 | unsigned i; | |
fdeb8e15 LW |
3459 | struct gpio_chip *chip = gdev->chip; |
3460 | unsigned gpio = gdev->base; | |
3461 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 3462 | int is_out; |
d468bf9e | 3463 | int is_irq; |
d2876d08 | 3464 | |
fdeb8e15 | 3465 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
3466 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
3467 | if (gdesc->name) { | |
3468 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
3469 | gpio, gdesc->name); | |
3470 | } | |
d2876d08 | 3471 | continue; |
ced433e2 | 3472 | } |
d2876d08 | 3473 | |
372e722e | 3474 | gpiod_get_direction(gdesc); |
d2876d08 | 3475 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 3476 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
3477 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
3478 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
3479 | is_out ? "out" : "in ", |
3480 | chip->get | |
3481 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
3482 | : "? ", |
3483 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
3484 | seq_printf(s, "\n"); |
3485 | } | |
3486 | } | |
3487 | ||
f9c4a31f | 3488 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 3489 | { |
362432ae | 3490 | unsigned long flags; |
ff2b1359 | 3491 | struct gpio_device *gdev = NULL; |
cb1650d4 | 3492 | loff_t index = *pos; |
d2876d08 | 3493 | |
f9c4a31f | 3494 | s->private = ""; |
d2876d08 | 3495 | |
362432ae | 3496 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3497 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
3498 | if (index-- == 0) { |
3499 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 3500 | return gdev; |
f9c4a31f | 3501 | } |
362432ae | 3502 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 3503 | |
cb1650d4 | 3504 | return NULL; |
f9c4a31f TR |
3505 | } |
3506 | ||
3507 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
3508 | { | |
362432ae | 3509 | unsigned long flags; |
ff2b1359 | 3510 | struct gpio_device *gdev = v; |
f9c4a31f TR |
3511 | void *ret = NULL; |
3512 | ||
362432ae | 3513 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3514 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
3515 | ret = NULL; |
3516 | else | |
ff2b1359 | 3517 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 3518 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3519 | |
3520 | s->private = "\n"; | |
3521 | ++*pos; | |
3522 | ||
3523 | return ret; | |
3524 | } | |
3525 | ||
3526 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
3527 | { | |
3528 | } | |
3529 | ||
3530 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
3531 | { | |
ff2b1359 LW |
3532 | struct gpio_device *gdev = v; |
3533 | struct gpio_chip *chip = gdev->chip; | |
3534 | struct device *parent; | |
3535 | ||
3536 | if (!chip) { | |
3537 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
3538 | dev_name(&gdev->dev)); | |
3539 | return 0; | |
3540 | } | |
f9c4a31f | 3541 | |
ff2b1359 LW |
3542 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
3543 | dev_name(&gdev->dev), | |
fdeb8e15 | 3544 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
3545 | parent = chip->parent; |
3546 | if (parent) | |
3547 | seq_printf(s, ", parent: %s/%s", | |
3548 | parent->bus ? parent->bus->name : "no-bus", | |
3549 | dev_name(parent)); | |
f9c4a31f TR |
3550 | if (chip->label) |
3551 | seq_printf(s, ", %s", chip->label); | |
3552 | if (chip->can_sleep) | |
3553 | seq_printf(s, ", can sleep"); | |
3554 | seq_printf(s, ":\n"); | |
3555 | ||
3556 | if (chip->dbg_show) | |
3557 | chip->dbg_show(s, chip); | |
3558 | else | |
fdeb8e15 | 3559 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 3560 | |
d2876d08 DB |
3561 | return 0; |
3562 | } | |
3563 | ||
f9c4a31f TR |
3564 | static const struct seq_operations gpiolib_seq_ops = { |
3565 | .start = gpiolib_seq_start, | |
3566 | .next = gpiolib_seq_next, | |
3567 | .stop = gpiolib_seq_stop, | |
3568 | .show = gpiolib_seq_show, | |
3569 | }; | |
3570 | ||
d2876d08 DB |
3571 | static int gpiolib_open(struct inode *inode, struct file *file) |
3572 | { | |
f9c4a31f | 3573 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
3574 | } |
3575 | ||
828c0950 | 3576 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 3577 | .owner = THIS_MODULE, |
d2876d08 DB |
3578 | .open = gpiolib_open, |
3579 | .read = seq_read, | |
3580 | .llseek = seq_lseek, | |
f9c4a31f | 3581 | .release = seq_release, |
d2876d08 DB |
3582 | }; |
3583 | ||
3584 | static int __init gpiolib_debugfs_init(void) | |
3585 | { | |
3586 | /* /sys/kernel/debug/gpio */ | |
3587 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
3588 | NULL, NULL, &gpiolib_operations); | |
3589 | return 0; | |
3590 | } | |
3591 | subsys_initcall(gpiolib_debugfs_init); | |
3592 | ||
3593 | #endif /* DEBUG_FS */ |