Commit | Line | Data |
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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> |
ff2b1359 | 19 | #include <linux/idr.h> |
3c702e99 LW |
20 | #include <linux/cdev.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <uapi/linux/gpio.h> | |
d2876d08 | 24 | |
664e3e5a MW |
25 | #include "gpiolib.h" |
26 | ||
3f397c21 UKK |
27 | #define CREATE_TRACE_POINTS |
28 | #include <trace/events/gpio.h> | |
d2876d08 | 29 | |
79a9becd | 30 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 31 | * |
79a9becd AC |
32 | * The GPIO programming interface allows for inlining speed-critical |
33 | * get/set operations for common cases, so that access to SOC-integrated | |
34 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
35 | */ |
36 | ||
37 | ||
38 | /* When debugging, extend minimal trust to callers and platform code. | |
39 | * Also emit diagnostic messages that may help initial bringup, when | |
40 | * board setup or driver bugs are most common. | |
41 | * | |
42 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
43 | */ | |
44 | #ifdef DEBUG | |
45 | #define extra_checks 1 | |
46 | #else | |
47 | #define extra_checks 0 | |
48 | #endif | |
49 | ||
ff2b1359 LW |
50 | /* Device and char device-related information */ |
51 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
52 | static dev_t gpio_devt; |
53 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
54 | static struct bus_type gpio_bus_type = { | |
55 | .name = "gpio", | |
56 | }; | |
ff2b1359 | 57 | |
d2876d08 DB |
58 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
59 | * While any GPIO is requested, its gpio_chip is not removable; | |
60 | * each GPIO's "requested" flag serves as a lock and refcount. | |
61 | */ | |
0eb4c6c2 | 62 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 63 | |
bae48da2 AC |
64 | static DEFINE_MUTEX(gpio_lookup_lock); |
65 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 66 | LIST_HEAD(gpio_devices); |
6d86750c JH |
67 | |
68 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
69 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
70 | ||
71 | ||
d2876d08 DB |
72 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
73 | { | |
d2876d08 | 74 | d->label = label; |
d2876d08 DB |
75 | } |
76 | ||
372e722e AC |
77 | /** |
78 | * Convert a GPIO number to its descriptor | |
79 | */ | |
79a9becd | 80 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 81 | { |
ff2b1359 | 82 | struct gpio_device *gdev; |
14e85c0e AC |
83 | unsigned long flags; |
84 | ||
85 | spin_lock_irqsave(&gpio_lock, flags); | |
86 | ||
ff2b1359 | 87 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
88 | if (gdev->base <= gpio && |
89 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 90 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 91 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
92 | } |
93 | } | |
94 | ||
95 | spin_unlock_irqrestore(&gpio_lock, flags); | |
96 | ||
0e9a5edf AC |
97 | if (!gpio_is_valid(gpio)) |
98 | WARN(1, "invalid GPIO %d\n", gpio); | |
99 | ||
14e85c0e | 100 | return NULL; |
372e722e | 101 | } |
79a9becd | 102 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 103 | |
d468bf9e | 104 | /** |
bb1e88cc | 105 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 106 | */ |
bb1e88cc AC |
107 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
108 | u16 hwnum) | |
d468bf9e | 109 | { |
fdeb8e15 LW |
110 | struct gpio_device *gdev = chip->gpiodev; |
111 | ||
112 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 113 | return ERR_PTR(-EINVAL); |
d468bf9e | 114 | |
fdeb8e15 | 115 | return &gdev->descs[hwnum]; |
d468bf9e | 116 | } |
372e722e AC |
117 | |
118 | /** | |
119 | * Convert a GPIO descriptor to the integer namespace. | |
120 | * This should disappear in the future but is needed since we still | |
121 | * use GPIO numbers for error messages and sysfs nodes | |
122 | */ | |
79a9becd | 123 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 124 | { |
fdeb8e15 | 125 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 126 | } |
79a9becd | 127 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
128 | |
129 | ||
79a9becd AC |
130 | /** |
131 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
132 | * @desc: descriptor to return the chip of | |
133 | */ | |
134 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 135 | { |
fdeb8e15 LW |
136 | if (!desc || !desc->gdev || !desc->gdev->chip) |
137 | return NULL; | |
138 | return desc->gdev->chip; | |
372e722e | 139 | } |
79a9becd | 140 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 141 | |
8d0aab2f AV |
142 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
143 | static int gpiochip_find_base(int ngpio) | |
144 | { | |
ff2b1359 | 145 | struct gpio_device *gdev; |
83cabe33 | 146 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 147 | |
ff2b1359 | 148 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 149 | /* found a free space? */ |
fdeb8e15 | 150 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
151 | break; |
152 | else | |
153 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 154 | base = gdev->base - ngpio; |
8d0aab2f AV |
155 | } |
156 | ||
83cabe33 | 157 | if (gpio_is_valid(base)) { |
8d0aab2f | 158 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
159 | return base; |
160 | } else { | |
161 | pr_err("%s: cannot find free range\n", __func__); | |
162 | return -ENOSPC; | |
169b6a7a | 163 | } |
169b6a7a AV |
164 | } |
165 | ||
79a9becd AC |
166 | /** |
167 | * gpiod_get_direction - return the current direction of a GPIO | |
168 | * @desc: GPIO to get the direction of | |
169 | * | |
170 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
171 | * | |
172 | * This function may sleep if gpiod_cansleep() is true. | |
173 | */ | |
8e53b0f1 | 174 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
175 | { |
176 | struct gpio_chip *chip; | |
372e722e | 177 | unsigned offset; |
80b0a602 MN |
178 | int status = -EINVAL; |
179 | ||
372e722e AC |
180 | chip = gpiod_to_chip(desc); |
181 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
182 | |
183 | if (!chip->get_direction) | |
184 | return status; | |
185 | ||
372e722e | 186 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
187 | if (status > 0) { |
188 | /* GPIOF_DIR_IN, or other positive */ | |
189 | status = 1; | |
8e53b0f1 | 190 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
191 | } |
192 | if (status == 0) { | |
193 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 194 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
195 | } |
196 | return status; | |
197 | } | |
79a9becd | 198 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 199 | |
1a989d0f AC |
200 | /* |
201 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 202 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
203 | * |
204 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
205 | * space. | |
206 | */ | |
ff2b1359 | 207 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 208 | { |
ff2b1359 LW |
209 | struct gpio_device *iterator; |
210 | struct gpio_device *previous = NULL; | |
211 | ||
212 | if (!gdev->chip) | |
213 | return -EINVAL; | |
1a989d0f | 214 | |
ff2b1359 LW |
215 | if (list_empty(&gpio_devices)) { |
216 | list_add_tail(&gdev->list, &gpio_devices); | |
e28ecca6 | 217 | return 0; |
1a989d0f AC |
218 | } |
219 | ||
ff2b1359 | 220 | list_for_each_entry(iterator, &gpio_devices, list) { |
fdeb8e15 | 221 | if (iterator->base >= gdev->base + gdev->ngpio) { |
ef7c7553 BJZ |
222 | /* |
223 | * Iterator is the first GPIO chip so there is no | |
224 | * previous one | |
225 | */ | |
e28ecca6 | 226 | if (!previous) { |
ef7c7553 BJZ |
227 | goto found; |
228 | } else { | |
229 | /* | |
230 | * We found a valid range(means | |
231 | * [base, base + ngpio - 1]) between previous | |
232 | * and iterator chip. | |
233 | */ | |
fdeb8e15 LW |
234 | if (previous->base + previous->ngpio |
235 | <= gdev->base) | |
ef7c7553 BJZ |
236 | goto found; |
237 | } | |
1a989d0f | 238 | } |
ef7c7553 | 239 | previous = iterator; |
1a989d0f AC |
240 | } |
241 | ||
e28ecca6 SM |
242 | /* |
243 | * We are beyond the last chip in the list and iterator now | |
244 | * points to the head. | |
245 | * Let iterator point to the last chip in the list. | |
246 | */ | |
247 | ||
ff2b1359 | 248 | iterator = list_last_entry(&gpio_devices, struct gpio_device, list); |
fdeb8e15 | 249 | if (iterator->base + iterator->ngpio <= gdev->base) { |
ff2b1359 | 250 | list_add(&gdev->list, &iterator->list); |
96098df1 | 251 | return 0; |
1a989d0f AC |
252 | } |
253 | ||
ff2b1359 | 254 | dev_err(&gdev->dev, |
ef7c7553 BJZ |
255 | "GPIO integer space overlap, cannot add chip\n"); |
256 | return -EBUSY; | |
1a989d0f | 257 | |
ef7c7553 | 258 | found: |
ff2b1359 | 259 | list_add_tail(&gdev->list, &iterator->list); |
ef7c7553 | 260 | return 0; |
1a989d0f AC |
261 | } |
262 | ||
f881bab0 LW |
263 | /** |
264 | * Convert a GPIO name to its descriptor | |
265 | */ | |
266 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
267 | { | |
ff2b1359 | 268 | struct gpio_device *gdev; |
f881bab0 LW |
269 | unsigned long flags; |
270 | ||
271 | spin_lock_irqsave(&gpio_lock, flags); | |
272 | ||
ff2b1359 | 273 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
274 | int i; |
275 | ||
fdeb8e15 LW |
276 | for (i = 0; i != gdev->ngpio; ++i) { |
277 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 278 | |
fdeb8e15 | 279 | if (!desc->name || !name) |
f881bab0 LW |
280 | continue; |
281 | ||
fdeb8e15 | 282 | if (!strcmp(desc->name, name)) { |
f881bab0 | 283 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 284 | return desc; |
f881bab0 LW |
285 | } |
286 | } | |
287 | } | |
288 | ||
289 | spin_unlock_irqrestore(&gpio_lock, flags); | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
5f3ca732 MP |
294 | /* |
295 | * Takes the names from gc->names and checks if they are all unique. If they | |
296 | * are, they are assigned to their gpio descriptors. | |
297 | * | |
ed37915c | 298 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
299 | */ |
300 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
301 | { | |
fdeb8e15 | 302 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
303 | int i; |
304 | ||
305 | if (!gc->names) | |
306 | return 0; | |
307 | ||
308 | /* First check all names if they are unique */ | |
309 | for (i = 0; i != gc->ngpio; ++i) { | |
310 | struct gpio_desc *gpio; | |
311 | ||
312 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 313 | if (gpio) |
fdeb8e15 | 314 | dev_warn(&gdev->dev, |
34ffd85d | 315 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 316 | gc->names[i]); |
5f3ca732 MP |
317 | } |
318 | ||
319 | /* Then add all names to the GPIO descriptors */ | |
320 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 321 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
3c702e99 LW |
326 | /** |
327 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
328 | */ | |
329 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
330 | { | |
331 | struct gpio_device *gdev = filp->private_data; | |
332 | struct gpio_chip *chip = gdev->chip; | |
333 | int __user *ip = (int __user *)arg; | |
3c702e99 LW |
334 | |
335 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
336 | if (!chip) | |
337 | return -ENODEV; | |
338 | ||
521a2ad6 | 339 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 340 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
341 | struct gpiochip_info chipinfo; |
342 | ||
3c702e99 LW |
343 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
344 | sizeof(chipinfo.name)); | |
345 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
346 | strncpy(chipinfo.label, gdev->label, |
347 | sizeof(chipinfo.label)); | |
348 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 349 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
350 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
351 | return -EFAULT; | |
352 | return 0; | |
521a2ad6 LW |
353 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
354 | struct gpioline_info lineinfo; | |
355 | struct gpio_desc *desc; | |
356 | ||
357 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
358 | return -EFAULT; | |
359 | if (lineinfo.line_offset > gdev->ngpio) | |
360 | return -EINVAL; | |
361 | ||
362 | desc = &gdev->descs[lineinfo.line_offset]; | |
363 | if (desc->name) { | |
364 | strncpy(lineinfo.name, desc->name, | |
365 | sizeof(lineinfo.name)); | |
366 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
367 | } else { | |
368 | lineinfo.name[0] = '\0'; | |
369 | } | |
370 | if (desc->label) { | |
371 | strncpy(lineinfo.label, desc->label, | |
372 | sizeof(lineinfo.label)); | |
373 | lineinfo.label[sizeof(lineinfo.label)-1] = '\0'; | |
374 | } else { | |
375 | lineinfo.label[0] = '\0'; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Userspace only need to know that the kernel is using | |
380 | * this GPIO so it can't use it. | |
381 | */ | |
382 | lineinfo.flags = 0; | |
383 | if (desc->flags & (FLAG_REQUESTED | FLAG_IS_HOGGED | | |
384 | FLAG_USED_AS_IRQ | FLAG_EXPORT | | |
385 | FLAG_SYSFS)) | |
386 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; | |
387 | if (desc->flags & FLAG_IS_OUT) | |
388 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; | |
389 | if (desc->flags & FLAG_ACTIVE_LOW) | |
390 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; | |
391 | if (desc->flags & FLAG_OPEN_DRAIN) | |
392 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; | |
393 | if (desc->flags & FLAG_OPEN_SOURCE) | |
394 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; | |
395 | ||
396 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
397 | return -EFAULT; | |
398 | return 0; | |
3c702e99 LW |
399 | } |
400 | return -EINVAL; | |
401 | } | |
402 | ||
403 | /** | |
404 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
405 | * @inode: inode for this chardev | |
406 | * @filp: file struct for storing private data | |
407 | * Returns 0 on success | |
408 | */ | |
409 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
410 | { | |
411 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
412 | struct gpio_device, chrdev); | |
413 | ||
414 | /* Fail on open if the backing gpiochip is gone */ | |
415 | if (!gdev || !gdev->chip) | |
416 | return -ENODEV; | |
417 | get_device(&gdev->dev); | |
418 | filp->private_data = gdev; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | /** | |
423 | * gpio_chrdev_release() - close chardev after ioctl operations | |
424 | * @inode: inode for this chardev | |
425 | * @filp: file struct for storing private data | |
426 | * Returns 0 on success | |
427 | */ | |
428 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
429 | { | |
430 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
431 | struct gpio_device, chrdev); | |
432 | ||
433 | if (!gdev) | |
434 | return -ENODEV; | |
435 | put_device(&gdev->dev); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | ||
440 | static const struct file_operations gpio_fileops = { | |
441 | .release = gpio_chrdev_release, | |
442 | .open = gpio_chrdev_open, | |
443 | .owner = THIS_MODULE, | |
444 | .llseek = noop_llseek, | |
445 | .unlocked_ioctl = gpio_ioctl, | |
446 | .compat_ioctl = gpio_ioctl, | |
447 | }; | |
448 | ||
ff2b1359 LW |
449 | static void gpiodevice_release(struct device *dev) |
450 | { | |
451 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
452 | ||
3c702e99 | 453 | cdev_del(&gdev->chrdev); |
ff2b1359 LW |
454 | list_del(&gdev->list); |
455 | ida_simple_remove(&gpio_ida, gdev->id); | |
9efd9e69 | 456 | kfree(gdev); |
ff2b1359 LW |
457 | } |
458 | ||
d2876d08 | 459 | /** |
b08ea35a | 460 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 461 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 462 | * Context: potentially before irqs will work |
d2876d08 DB |
463 | * |
464 | * Returns a negative errno if the chip can't be registered, such as | |
465 | * because the chip->base is invalid or already associated with a | |
466 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 467 | * |
b08ea35a | 468 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 469 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
470 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
471 | * for GPIOs will fail rudely. | |
472 | * | |
8d0aab2f AV |
473 | * If chip->base is negative, this requests dynamic assignment of |
474 | * a range of valid GPIOs. | |
d2876d08 | 475 | */ |
b08ea35a | 476 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
477 | { |
478 | unsigned long flags; | |
479 | int status = 0; | |
ff2b1359 | 480 | unsigned i; |
8d0aab2f | 481 | int base = chip->base; |
ff2b1359 | 482 | struct gpio_device *gdev; |
d2876d08 | 483 | |
ff2b1359 LW |
484 | /* |
485 | * First: allocate and populate the internal stat container, and | |
486 | * set up the struct device. | |
487 | */ | |
969f07b4 | 488 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 489 | if (!gdev) |
14e85c0e | 490 | return -ENOMEM; |
3c702e99 | 491 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
492 | gdev->chip = chip; |
493 | chip->gpiodev = gdev; | |
494 | if (chip->parent) { | |
495 | gdev->dev.parent = chip->parent; | |
496 | gdev->dev.of_node = chip->parent->of_node; | |
497 | } else { | |
498 | #ifdef CONFIG_OF_GPIO | |
499 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
500 | if (chip->of_node) | |
501 | gdev->dev.of_node = chip->of_node; | |
502 | #endif | |
503 | } | |
504 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); | |
505 | if (gdev->id < 0) { | |
506 | status = gdev->id; | |
507 | goto err_free_gdev; | |
508 | } | |
509 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
510 | device_initialize(&gdev->dev); | |
511 | dev_set_drvdata(&gdev->dev, gdev); | |
512 | if (chip->parent && chip->parent->driver) | |
513 | gdev->owner = chip->parent->driver->owner; | |
514 | else if (chip->owner) | |
515 | /* TODO: remove chip->owner */ | |
516 | gdev->owner = chip->owner; | |
517 | else | |
518 | gdev->owner = THIS_MODULE; | |
d2876d08 | 519 | |
1c3cdb18 LW |
520 | gdev->descs = devm_kcalloc(&gdev->dev, chip->ngpio, |
521 | sizeof(gdev->descs[0]), GFP_KERNEL); | |
522 | if (!gdev->descs) { | |
ff2b1359 LW |
523 | status = -ENOMEM; |
524 | goto err_free_gdev; | |
525 | } | |
526 | ||
5ed41cc4 BJZ |
527 | if (chip->ngpio == 0) { |
528 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 529 | status = -EINVAL; |
1c3cdb18 | 530 | goto err_free_gdev; |
5ed41cc4 | 531 | } |
df4878e9 LW |
532 | |
533 | if (chip->label) | |
534 | gdev->label = devm_kstrdup(&gdev->dev, chip->label, GFP_KERNEL); | |
535 | else | |
536 | gdev->label = devm_kstrdup(&gdev->dev, "unknown", GFP_KERNEL); | |
537 | if (!gdev->label) { | |
538 | status = -ENOMEM; | |
539 | goto err_free_gdev; | |
540 | } | |
541 | ||
fdeb8e15 | 542 | gdev->ngpio = chip->ngpio; |
43c54eca | 543 | gdev->data = data; |
5ed41cc4 | 544 | |
d2876d08 DB |
545 | spin_lock_irqsave(&gpio_lock, flags); |
546 | ||
fdeb8e15 LW |
547 | /* |
548 | * TODO: this allocates a Linux GPIO number base in the global | |
549 | * GPIO numberspace for this chip. In the long run we want to | |
550 | * get *rid* of this numberspace and use only descriptors, but | |
551 | * it may be a pipe dream. It will not happen before we get rid | |
552 | * of the sysfs interface anyways. | |
553 | */ | |
8d0aab2f AV |
554 | if (base < 0) { |
555 | base = gpiochip_find_base(chip->ngpio); | |
556 | if (base < 0) { | |
557 | status = base; | |
225fce83 | 558 | spin_unlock_irqrestore(&gpio_lock, flags); |
1c3cdb18 | 559 | goto err_free_gdev; |
8d0aab2f | 560 | } |
fdeb8e15 LW |
561 | /* |
562 | * TODO: it should not be necessary to reflect the assigned | |
563 | * base outside of the GPIO subsystem. Go over drivers and | |
564 | * see if anyone makes use of this, else drop this and assign | |
565 | * a poison instead. | |
566 | */ | |
8d0aab2f AV |
567 | chip->base = base; |
568 | } | |
fdeb8e15 | 569 | gdev->base = base; |
8d0aab2f | 570 | |
ff2b1359 | 571 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
572 | if (status) { |
573 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1c3cdb18 | 574 | goto err_free_gdev; |
05aa5203 | 575 | } |
1a989d0f | 576 | |
ff2b1359 | 577 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 578 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 579 | |
fdeb8e15 | 580 | desc->gdev = gdev; |
05aa5203 JH |
581 | |
582 | /* REVISIT: most hardware initializes GPIOs as inputs (often | |
583 | * with pullups enabled) so power usage is minimized. Linux | |
584 | * code should set the gpio direction first thing; but until | |
585 | * it does, and in case chip->get_direction is not set, we may | |
586 | * expose the wrong direction in sysfs. | |
587 | */ | |
588 | desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; | |
d2876d08 | 589 | } |
14e85c0e | 590 | |
3bae4811 ZG |
591 | spin_unlock_irqrestore(&gpio_lock, flags); |
592 | ||
f23f1516 | 593 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 594 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
595 | #endif |
596 | ||
5f3ca732 MP |
597 | status = gpiochip_set_desc_names(chip); |
598 | if (status) | |
599 | goto err_remove_from_list; | |
600 | ||
28355f81 TV |
601 | status = of_gpiochip_add(chip); |
602 | if (status) | |
603 | goto err_remove_chip; | |
604 | ||
664e3e5a | 605 | acpi_gpiochip_add(chip); |
391c970c | 606 | |
3c702e99 LW |
607 | /* |
608 | * By first adding the chardev, and then adding the device, | |
609 | * we get a device node entry in sysfs under | |
610 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
611 | * coldplug of device nodes and other udev business. | |
612 | */ | |
613 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
614 | gdev->chrdev.owner = THIS_MODULE; | |
615 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
616 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
617 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
618 | if (status < 0) | |
619 | chip_warn(chip, "failed to add char device %d:%d\n", | |
620 | MAJOR(gpio_devt), gdev->id); | |
621 | else | |
622 | chip_dbg(chip, "added GPIO chardev (%d:%d)\n", | |
623 | MAJOR(gpio_devt), gdev->id); | |
ff2b1359 | 624 | status = device_add(&gdev->dev); |
225fce83 | 625 | if (status) |
3c702e99 | 626 | goto err_remove_chardev; |
cedb1881 | 627 | |
afbc4f31 | 628 | status = gpiochip_sysfs_register(gdev); |
ff2b1359 LW |
629 | if (status) |
630 | goto err_remove_device; | |
631 | ||
632 | /* From this point, the .release() function cleans up gpio_device */ | |
633 | gdev->dev.release = gpiodevice_release; | |
634 | get_device(&gdev->dev); | |
fdeb8e15 LW |
635 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
636 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
637 | dev_name(&gdev->dev), chip->label ? : "generic"); | |
64842aad | 638 | |
cedb1881 | 639 | return 0; |
3bae4811 | 640 | |
ff2b1359 LW |
641 | err_remove_device: |
642 | device_del(&gdev->dev); | |
3c702e99 LW |
643 | err_remove_chardev: |
644 | cdev_del(&gdev->chrdev); | |
225fce83 JH |
645 | err_remove_chip: |
646 | acpi_gpiochip_remove(chip); | |
6d86750c | 647 | gpiochip_free_hogs(chip); |
225fce83 | 648 | of_gpiochip_remove(chip); |
5f3ca732 | 649 | err_remove_from_list: |
225fce83 | 650 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 651 | list_del(&gdev->list); |
3bae4811 | 652 | spin_unlock_irqrestore(&gpio_lock, flags); |
ff2b1359 LW |
653 | err_free_gdev: |
654 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 655 | /* failures here can mean systems won't boot... */ |
7589e59f | 656 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
657 | gdev->base, gdev->base + gdev->ngpio - 1, |
658 | chip->label ? : "generic"); | |
659 | kfree(gdev); | |
d2876d08 DB |
660 | return status; |
661 | } | |
b08ea35a | 662 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 663 | |
43c54eca LW |
664 | /** |
665 | * gpiochip_get_data() - get per-subdriver data for the chip | |
666 | */ | |
667 | void *gpiochip_get_data(struct gpio_chip *chip) | |
668 | { | |
669 | return chip->gpiodev->data; | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
672 | ||
d2876d08 DB |
673 | /** |
674 | * gpiochip_remove() - unregister a gpio_chip | |
675 | * @chip: the chip to unregister | |
676 | * | |
677 | * A gpio_chip with any GPIOs still requested may not be removed. | |
678 | */ | |
e1db1706 | 679 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 680 | { |
ff2b1359 | 681 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 682 | struct gpio_desc *desc; |
d2876d08 | 683 | unsigned long flags; |
1c3cdb18 | 684 | unsigned i; |
fab28b89 | 685 | bool requested = false; |
d2876d08 | 686 | |
ff2b1359 | 687 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 688 | gpiochip_sysfs_unregister(gdev); |
bd203bd5 BJZ |
689 | /* Numb the device, cancelling all outstanding operations */ |
690 | gdev->chip = NULL; | |
00acc3dc | 691 | gpiochip_irqchip_remove(chip); |
6072b9dc | 692 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 693 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 694 | gpiochip_free_hogs(chip); |
391c970c | 695 | of_gpiochip_remove(chip); |
43c54eca LW |
696 | /* |
697 | * We accept no more calls into the driver from this point, so | |
698 | * NULL the driver data pointer | |
699 | */ | |
700 | gdev->data = NULL; | |
391c970c | 701 | |
6798acaa | 702 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 703 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 704 | desc = &gdev->descs[i]; |
fab28b89 JH |
705 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
706 | requested = true; | |
d2876d08 | 707 | } |
d2876d08 | 708 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 709 | |
fab28b89 | 710 | if (requested) |
fdeb8e15 | 711 | dev_crit(&gdev->dev, |
58383c78 | 712 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 713 | |
ff2b1359 LW |
714 | /* |
715 | * The gpiochip side puts its use of the device to rest here: | |
716 | * if there are no userspace clients, the chardev and device will | |
717 | * be removed, else it will be dangling until the last user is | |
718 | * gone. | |
719 | */ | |
720 | put_device(&gdev->dev); | |
d2876d08 DB |
721 | } |
722 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
723 | ||
594fa265 GL |
724 | /** |
725 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
726 | * @data: data to pass to match function | |
727 | * @callback: Callback function to check gpio_chip | |
728 | * | |
729 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
730 | * determined by a user supplied @match callback. The callback should return | |
731 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
732 | * non-zero, this function will return to the caller and not iterate over any | |
733 | * more gpio_chips. | |
734 | */ | |
07ce8ec7 | 735 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 736 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 737 | void *data)) |
594fa265 | 738 | { |
ff2b1359 | 739 | struct gpio_device *gdev; |
125eef96 | 740 | struct gpio_chip *chip; |
594fa265 | 741 | unsigned long flags; |
594fa265 GL |
742 | |
743 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 LW |
744 | list_for_each_entry(gdev, &gpio_devices, list) |
745 | if (match(gdev->chip, data)) | |
594fa265 | 746 | break; |
125eef96 AC |
747 | |
748 | /* No match? */ | |
ff2b1359 | 749 | if (&gdev->list == &gpio_devices) |
125eef96 | 750 | chip = NULL; |
ff2b1359 LW |
751 | else |
752 | chip = gdev->chip; | |
753 | ||
594fa265 GL |
754 | spin_unlock_irqrestore(&gpio_lock, flags); |
755 | ||
756 | return chip; | |
757 | } | |
8fa0c9bf | 758 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 759 | |
79697ef9 AC |
760 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
761 | { | |
762 | const char *name = data; | |
763 | ||
764 | return !strcmp(chip->label, name); | |
765 | } | |
766 | ||
767 | static struct gpio_chip *find_chip_by_name(const char *name) | |
768 | { | |
769 | return gpiochip_find((void *)name, gpiochip_match_name); | |
770 | } | |
771 | ||
14250520 LW |
772 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
773 | ||
774 | /* | |
775 | * The following is irqchip helper code for gpiochips. | |
776 | */ | |
777 | ||
778 | /** | |
3f97d5fc LW |
779 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
780 | * @gpiochip: the gpiochip to set the irqchip chain to | |
781 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
782 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
783 | * chained irqchip | |
784 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
785 | * coming out of the gpiochip. If the interrupt is nested rather than |
786 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
787 | */ |
788 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
789 | struct irq_chip *irqchip, | |
790 | int parent_irq, | |
791 | irq_flow_handler_t parent_handler) | |
792 | { | |
83141a77 LW |
793 | unsigned int offset; |
794 | ||
83141a77 LW |
795 | if (!gpiochip->irqdomain) { |
796 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
797 | __func__); | |
1c8732bb LW |
798 | return; |
799 | } | |
800 | ||
3f97d5fc LW |
801 | if (parent_handler) { |
802 | if (gpiochip->can_sleep) { | |
803 | chip_err(gpiochip, | |
804 | "you cannot have chained interrupts on a " | |
805 | "chip that may sleep\n"); | |
806 | return; | |
807 | } | |
3f97d5fc LW |
808 | /* |
809 | * The parent irqchip is already using the chip_data for this | |
810 | * irqchip, so our callbacks simply use the handler_data. | |
811 | */ | |
f7f87753 TG |
812 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
813 | gpiochip); | |
25e4fe92 DES |
814 | |
815 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 816 | } |
83141a77 LW |
817 | |
818 | /* Set the parent IRQ for all affected IRQs */ | |
819 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
820 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
821 | parent_irq); | |
14250520 LW |
822 | } |
823 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
824 | ||
825 | /** | |
826 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
827 | * @d: the irqdomain used by this irqchip | |
828 | * @irq: the global irq number used by this GPIO irqchip irq | |
829 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
830 | * | |
831 | * This function will set up the mapping for a certain IRQ line on a | |
832 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
833 | * stored inside the gpiochip. | |
834 | */ | |
835 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
836 | irq_hw_number_t hwirq) | |
837 | { | |
838 | struct gpio_chip *chip = d->host_data; | |
839 | ||
14250520 | 840 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
841 | /* |
842 | * This lock class tells lockdep that GPIO irqs are in a different | |
843 | * category than their parents, so it won't report false recursion. | |
844 | */ | |
845 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 846 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 847 | /* Chips that can sleep need nested thread handlers */ |
295494af | 848 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 849 | irq_set_nested_thread(irq, 1); |
14250520 | 850 | irq_set_noprobe(irq); |
23393d49 | 851 | |
1333b90f LW |
852 | /* |
853 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
854 | * is passed as default type. | |
855 | */ | |
856 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
857 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
858 | |
859 | return 0; | |
860 | } | |
861 | ||
c3626fde LW |
862 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
863 | { | |
1c8732bb LW |
864 | struct gpio_chip *chip = d->host_data; |
865 | ||
1c8732bb LW |
866 | if (chip->can_sleep) |
867 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
868 | irq_set_chip_and_handler(irq, NULL, NULL); |
869 | irq_set_chip_data(irq, NULL); | |
870 | } | |
871 | ||
14250520 LW |
872 | static const struct irq_domain_ops gpiochip_domain_ops = { |
873 | .map = gpiochip_irq_map, | |
c3626fde | 874 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
875 | /* Virtually all GPIO irqchips are twocell:ed */ |
876 | .xlate = irq_domain_xlate_twocell, | |
877 | }; | |
878 | ||
879 | static int gpiochip_irq_reqres(struct irq_data *d) | |
880 | { | |
881 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
882 | ||
ff2b1359 | 883 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
884 | return -ENODEV; |
885 | ||
e3a2e878 | 886 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
887 | chip_err(chip, |
888 | "unable to lock HW IRQ %lu for IRQ\n", | |
889 | d->hwirq); | |
ff2b1359 | 890 | module_put(chip->gpiodev->owner); |
14250520 LW |
891 | return -EINVAL; |
892 | } | |
893 | return 0; | |
894 | } | |
895 | ||
896 | static void gpiochip_irq_relres(struct irq_data *d) | |
897 | { | |
898 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
899 | ||
e3a2e878 | 900 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 901 | module_put(chip->gpiodev->owner); |
14250520 LW |
902 | } |
903 | ||
904 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
905 | { | |
906 | return irq_find_mapping(chip->irqdomain, offset); | |
907 | } | |
908 | ||
909 | /** | |
910 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
911 | * @gpiochip: the gpiochip to remove the irqchip from | |
912 | * | |
913 | * This is called only from gpiochip_remove() | |
914 | */ | |
915 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
916 | { | |
c3626fde LW |
917 | unsigned int offset; |
918 | ||
afa82fab MW |
919 | acpi_gpiochip_free_interrupts(gpiochip); |
920 | ||
25e4fe92 DES |
921 | if (gpiochip->irq_parent) { |
922 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
923 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
924 | } | |
925 | ||
c3626fde LW |
926 | /* Remove all IRQ mappings and delete the domain */ |
927 | if (gpiochip->irqdomain) { | |
928 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
929 | irq_dispose_mapping( |
930 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 931 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 932 | } |
14250520 LW |
933 | |
934 | if (gpiochip->irqchip) { | |
935 | gpiochip->irqchip->irq_request_resources = NULL; | |
936 | gpiochip->irqchip->irq_release_resources = NULL; | |
937 | gpiochip->irqchip = NULL; | |
938 | } | |
939 | } | |
940 | ||
941 | /** | |
942 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
943 | * @gpiochip: the gpiochip to add the irqchip to | |
944 | * @irqchip: the irqchip to add to the gpiochip | |
945 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
946 | * allocate gpiochip irqs from | |
947 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
948 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
949 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 950 | * @lock_key: lockdep class |
14250520 LW |
951 | * |
952 | * This function closely associates a certain irqchip with a certain | |
953 | * gpiochip, providing an irq domain to translate the local IRQs to | |
954 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
955 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 956 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
957 | * from the gpiochip passed as chip data. An irqdomain will be stored |
958 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
959 | * translation. The gpiochip will need to be initialized and registered | |
960 | * before calling this function. | |
961 | * | |
c3626fde LW |
962 | * This function will handle two cell:ed simple IRQs and assumes all |
963 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
964 | * need to be open coded. |
965 | */ | |
a0a8bcf4 GS |
966 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
967 | struct irq_chip *irqchip, | |
968 | unsigned int first_irq, | |
969 | irq_flow_handler_t handler, | |
970 | unsigned int type, | |
971 | struct lock_class_key *lock_key) | |
14250520 LW |
972 | { |
973 | struct device_node *of_node; | |
974 | unsigned int offset; | |
c3626fde | 975 | unsigned irq_base = 0; |
14250520 LW |
976 | |
977 | if (!gpiochip || !irqchip) | |
978 | return -EINVAL; | |
979 | ||
58383c78 | 980 | if (!gpiochip->parent) { |
14250520 LW |
981 | pr_err("missing gpiochip .dev parent pointer\n"); |
982 | return -EINVAL; | |
983 | } | |
58383c78 | 984 | of_node = gpiochip->parent->of_node; |
14250520 LW |
985 | #ifdef CONFIG_OF_GPIO |
986 | /* | |
20a8a968 | 987 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
988 | * FIXME: get rid of this and use gpiochip->parent->of_node |
989 | * everywhere | |
14250520 LW |
990 | */ |
991 | if (gpiochip->of_node) | |
992 | of_node = gpiochip->of_node; | |
993 | #endif | |
994 | gpiochip->irqchip = irqchip; | |
995 | gpiochip->irq_handler = handler; | |
996 | gpiochip->irq_default_type = type; | |
997 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 998 | gpiochip->lock_key = lock_key; |
14250520 LW |
999 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1000 | gpiochip->ngpio, first_irq, | |
1001 | &gpiochip_domain_ops, gpiochip); | |
1002 | if (!gpiochip->irqdomain) { | |
1003 | gpiochip->irqchip = NULL; | |
1004 | return -EINVAL; | |
1005 | } | |
8b67a1f0 RV |
1006 | |
1007 | /* | |
1008 | * It is possible for a driver to override this, but only if the | |
1009 | * alternative functions are both implemented. | |
1010 | */ | |
1011 | if (!irqchip->irq_request_resources && | |
1012 | !irqchip->irq_release_resources) { | |
1013 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1014 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1015 | } | |
14250520 LW |
1016 | |
1017 | /* | |
1018 | * Prepare the mapping since the irqchip shall be orthogonal to | |
1019 | * any gpiochip calls. If the first_irq was zero, this is | |
1020 | * necessary to allocate descriptors for all IRQs. | |
1021 | */ | |
c3626fde LW |
1022 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1023 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
1024 | if (offset == 0) | |
1025 | /* | |
1026 | * Store the base into the gpiochip to be used when | |
1027 | * unmapping the irqs. | |
1028 | */ | |
1029 | gpiochip->irq_base = irq_base; | |
1030 | } | |
14250520 | 1031 | |
afa82fab MW |
1032 | acpi_gpiochip_request_interrupts(gpiochip); |
1033 | ||
14250520 LW |
1034 | return 0; |
1035 | } | |
a0a8bcf4 | 1036 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
1037 | |
1038 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1039 | ||
1040 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
1041 | ||
1042 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1043 | ||
c771c2f4 JG |
1044 | /** |
1045 | * gpiochip_generic_request() - request the gpio function for a pin | |
1046 | * @chip: the gpiochip owning the GPIO | |
1047 | * @offset: the offset of the GPIO to request for GPIO function | |
1048 | */ | |
1049 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1050 | { | |
fdeb8e15 | 1051 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1052 | } |
1053 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1054 | ||
1055 | /** | |
1056 | * gpiochip_generic_free() - free the gpio function from a pin | |
1057 | * @chip: the gpiochip to request the gpio function for | |
1058 | * @offset: the offset of the GPIO to free from GPIO function | |
1059 | */ | |
1060 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1061 | { | |
fdeb8e15 | 1062 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1063 | } |
1064 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1065 | ||
f23f1516 | 1066 | #ifdef CONFIG_PINCTRL |
165adc9c | 1067 | |
586a87e6 CR |
1068 | /** |
1069 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1070 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1071 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1072 | * @gpio_offset: the start offset in the current gpio_chip number space |
1073 | * @pin_group: name of the pin group inside the pin controller | |
1074 | */ | |
1075 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1076 | struct pinctrl_dev *pctldev, | |
1077 | unsigned int gpio_offset, const char *pin_group) | |
1078 | { | |
1079 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1080 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1081 | int ret; |
1082 | ||
1083 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1084 | if (!pin_range) { | |
1a2a99c6 | 1085 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1086 | return -ENOMEM; |
1087 | } | |
1088 | ||
1089 | /* Use local offset as range ID */ | |
1090 | pin_range->range.id = gpio_offset; | |
1091 | pin_range->range.gc = chip; | |
1092 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1093 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1094 | pin_range->pctldev = pctldev; |
1095 | ||
1096 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1097 | &pin_range->range.pins, | |
1098 | &pin_range->range.npins); | |
61c6375d MN |
1099 | if (ret < 0) { |
1100 | kfree(pin_range); | |
586a87e6 | 1101 | return ret; |
61c6375d | 1102 | } |
586a87e6 CR |
1103 | |
1104 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1105 | ||
1a2a99c6 AS |
1106 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1107 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1108 | pinctrl_dev_get_devname(pctldev), pin_group); |
1109 | ||
20ec3e39 | 1110 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1111 | |
1112 | return 0; | |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1115 | ||
3f0f8670 LW |
1116 | /** |
1117 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1118 | * @chip: the gpiochip to add the range for | |
1119 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1120 | * @gpio_offset: the start offset in the current gpio_chip number space |
1121 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1122 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1123 | * pin controller) to accumulate in this range | |
1124 | */ | |
1e63d7b9 | 1125 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1126 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1127 | unsigned int npins) |
f23f1516 SH |
1128 | { |
1129 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1130 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1131 | int ret; |
f23f1516 | 1132 | |
3f0f8670 | 1133 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1134 | if (!pin_range) { |
1a2a99c6 | 1135 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1136 | return -ENOMEM; |
f23f1516 SH |
1137 | } |
1138 | ||
3f0f8670 | 1139 | /* Use local offset as range ID */ |
316511c0 | 1140 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1141 | pin_range->range.gc = chip; |
f23f1516 | 1142 | pin_range->range.name = chip->label; |
fdeb8e15 | 1143 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1144 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1145 | pin_range->range.npins = npins; |
192c369c | 1146 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1147 | &pin_range->range); |
8f23ca1a | 1148 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1149 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1150 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1151 | kfree(pin_range); |
b4d4b1f0 | 1152 | return ret; |
3f0f8670 | 1153 | } |
1a2a99c6 AS |
1154 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1155 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1156 | pinctl_name, |
1157 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1158 | |
20ec3e39 | 1159 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1160 | |
1161 | return 0; | |
f23f1516 | 1162 | } |
165adc9c | 1163 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1164 | |
3f0f8670 LW |
1165 | /** |
1166 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1167 | * @chip: the chip to remove all the mappings for | |
1168 | */ | |
f23f1516 SH |
1169 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1170 | { | |
1171 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1172 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1173 | |
20ec3e39 | 1174 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1175 | list_del(&pin_range->node); |
1176 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1177 | &pin_range->range); | |
3f0f8670 | 1178 | kfree(pin_range); |
f23f1516 SH |
1179 | } |
1180 | } | |
165adc9c LW |
1181 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1182 | ||
1183 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1184 | |
d2876d08 DB |
1185 | /* These "optional" allocation calls help prevent drivers from stomping |
1186 | * on each other, and help provide better diagnostics in debugfs. | |
1187 | * They're called even less than the "set direction" calls. | |
1188 | */ | |
77c2d792 | 1189 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1190 | { |
fdeb8e15 | 1191 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1192 | int status; |
d2876d08 DB |
1193 | unsigned long flags; |
1194 | ||
bcabdef1 AC |
1195 | spin_lock_irqsave(&gpio_lock, flags); |
1196 | ||
d2876d08 | 1197 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1198 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1199 | */ |
1200 | ||
1201 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1202 | desc_set_label(desc, label ? : "?"); | |
1203 | status = 0; | |
438d8908 | 1204 | } else { |
d2876d08 | 1205 | status = -EBUSY; |
7460db56 | 1206 | goto done; |
35e8bb51 DB |
1207 | } |
1208 | ||
1209 | if (chip->request) { | |
1210 | /* chip->request may sleep */ | |
1211 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1212 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1213 | spin_lock_irqsave(&gpio_lock, flags); |
1214 | ||
1215 | if (status < 0) { | |
1216 | desc_set_label(desc, NULL); | |
35e8bb51 | 1217 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1218 | goto done; |
35e8bb51 | 1219 | } |
438d8908 | 1220 | } |
80b0a602 MN |
1221 | if (chip->get_direction) { |
1222 | /* chip->get_direction may sleep */ | |
1223 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1224 | gpiod_get_direction(desc); |
80b0a602 MN |
1225 | spin_lock_irqsave(&gpio_lock, flags); |
1226 | } | |
77c2d792 | 1227 | done: |
923b93e4 LP |
1228 | if (status < 0) { |
1229 | /* Clear flags that might have been set by the caller before | |
1230 | * requesting the GPIO. | |
1231 | */ | |
1232 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
1233 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
1234 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
1235 | } | |
77c2d792 MW |
1236 | spin_unlock_irqrestore(&gpio_lock, flags); |
1237 | return status; | |
1238 | } | |
1239 | ||
fdeb8e15 LW |
1240 | /* |
1241 | * This descriptor validation needs to be inserted verbatim into each | |
1242 | * function taking a descriptor, so we need to use a preprocessor | |
1243 | * macro to avoid endless duplication. | |
1244 | */ | |
1245 | #define VALIDATE_DESC(desc) do { \ | |
1246 | if (!desc || !desc->gdev) { \ | |
1247 | pr_warn("%s: invalid GPIO\n", __func__); \ | |
1248 | return -EINVAL; \ | |
1249 | } \ | |
1250 | if ( !desc->gdev->chip ) { \ | |
1251 | dev_warn(&desc->gdev->dev, \ | |
1252 | "%s: backing chip is gone\n", __func__); \ | |
1253 | return 0; \ | |
1254 | } } while (0) | |
1255 | ||
1256 | #define VALIDATE_DESC_VOID(desc) do { \ | |
1257 | if (!desc || !desc->gdev) { \ | |
1258 | pr_warn("%s: invalid GPIO\n", __func__); \ | |
1259 | return; \ | |
1260 | } \ | |
1261 | if (!desc->gdev->chip) { \ | |
1262 | dev_warn(&desc->gdev->dev, \ | |
1263 | "%s: backing chip is gone\n", __func__); \ | |
1264 | return; \ | |
1265 | } } while (0) | |
1266 | ||
1267 | ||
0eb4c6c2 | 1268 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1269 | { |
1270 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1271 | struct gpio_device *gdev; |
77c2d792 | 1272 | |
fdeb8e15 LW |
1273 | VALIDATE_DESC(desc); |
1274 | gdev = desc->gdev; | |
77c2d792 | 1275 | |
fdeb8e15 | 1276 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1277 | status = __gpiod_request(desc, label); |
1278 | if (status < 0) | |
fdeb8e15 | 1279 | module_put(gdev->owner); |
33a68e86 LW |
1280 | else |
1281 | get_device(&gdev->dev); | |
77c2d792 MW |
1282 | } |
1283 | ||
d2876d08 | 1284 | if (status) |
7589e59f | 1285 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 1286 | |
d2876d08 DB |
1287 | return status; |
1288 | } | |
372e722e | 1289 | |
77c2d792 | 1290 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 1291 | { |
77c2d792 | 1292 | bool ret = false; |
d2876d08 | 1293 | unsigned long flags; |
35e8bb51 | 1294 | struct gpio_chip *chip; |
d2876d08 | 1295 | |
3d599d1c UKK |
1296 | might_sleep(); |
1297 | ||
372e722e | 1298 | gpiod_unexport(desc); |
d8f388d8 | 1299 | |
d2876d08 DB |
1300 | spin_lock_irqsave(&gpio_lock, flags); |
1301 | ||
fdeb8e15 | 1302 | chip = desc->gdev->chip; |
35e8bb51 DB |
1303 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
1304 | if (chip->free) { | |
1305 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 1306 | might_sleep_if(chip->can_sleep); |
372e722e | 1307 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1308 | spin_lock_irqsave(&gpio_lock, flags); |
1309 | } | |
d2876d08 | 1310 | desc_set_label(desc, NULL); |
07697461 | 1311 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 1312 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 1313 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 1314 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 1315 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
1316 | ret = true; |
1317 | } | |
d2876d08 DB |
1318 | |
1319 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
1320 | return ret; |
1321 | } | |
1322 | ||
0eb4c6c2 | 1323 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 1324 | { |
33a68e86 | 1325 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 1326 | module_put(desc->gdev->owner); |
33a68e86 LW |
1327 | put_device(&desc->gdev->dev); |
1328 | } else { | |
77c2d792 | 1329 | WARN_ON(extra_checks); |
33a68e86 | 1330 | } |
d2876d08 | 1331 | } |
372e722e | 1332 | |
d2876d08 DB |
1333 | /** |
1334 | * gpiochip_is_requested - return string iff signal was requested | |
1335 | * @chip: controller managing the signal | |
1336 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1337 | * | |
1338 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
1339 | * The string returned is the label passed to gpio_request(); if none has been |
1340 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
1341 | * |
1342 | * This function is for use by GPIO controller drivers. The label can | |
1343 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1344 | * can help avoid accidentally multiplexing it to another controller. | |
1345 | */ | |
1346 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1347 | { | |
6c0b4e6c | 1348 | struct gpio_desc *desc; |
d2876d08 | 1349 | |
48b5953e | 1350 | if (offset >= chip->ngpio) |
d2876d08 | 1351 | return NULL; |
6c0b4e6c | 1352 | |
1c3cdb18 | 1353 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 1354 | |
372e722e | 1355 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1356 | return NULL; |
372e722e | 1357 | return desc->label; |
d2876d08 DB |
1358 | } |
1359 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1360 | ||
77c2d792 MW |
1361 | /** |
1362 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1363 | * @desc: GPIO descriptor to request | |
1364 | * @label: label for the GPIO | |
1365 | * | |
1366 | * Function allows GPIO chip drivers to request and use their own GPIO | |
1367 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
1368 | * function will not increase reference count of the GPIO chip module. This | |
1369 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
1370 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
1371 | */ | |
abdc08a3 AC |
1372 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
1373 | const char *label) | |
77c2d792 | 1374 | { |
abdc08a3 AC |
1375 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
1376 | int err; | |
77c2d792 | 1377 | |
abdc08a3 AC |
1378 | if (IS_ERR(desc)) { |
1379 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
1380 | return desc; | |
1381 | } | |
1382 | ||
1383 | err = __gpiod_request(desc, label); | |
1384 | if (err < 0) | |
1385 | return ERR_PTR(err); | |
77c2d792 | 1386 | |
abdc08a3 | 1387 | return desc; |
77c2d792 | 1388 | } |
f7d4ad98 | 1389 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
1390 | |
1391 | /** | |
1392 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
1393 | * @desc: GPIO descriptor to free | |
1394 | * | |
1395 | * Function frees the given GPIO requested previously with | |
1396 | * gpiochip_request_own_desc(). | |
1397 | */ | |
1398 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
1399 | { | |
1400 | if (desc) | |
1401 | __gpiod_free(desc); | |
1402 | } | |
f7d4ad98 | 1403 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 1404 | |
fdeb8e15 LW |
1405 | /* |
1406 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
1407 | * some cases this is done in early boot, before IRQs are enabled. |
1408 | * | |
1409 | * As a rule these aren't called more than once (except for drivers | |
1410 | * using the open-drain emulation idiom) so these are natural places | |
1411 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1412 | * rely on gpio_request() having been called beforehand. | |
1413 | */ | |
1414 | ||
79a9becd AC |
1415 | /** |
1416 | * gpiod_direction_input - set the GPIO direction to input | |
1417 | * @desc: GPIO to set to input | |
1418 | * | |
1419 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1420 | * be called safely on it. | |
1421 | * | |
1422 | * Return 0 in case of success, else an error code. | |
1423 | */ | |
1424 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 1425 | { |
d2876d08 | 1426 | struct gpio_chip *chip; |
d2876d08 DB |
1427 | int status = -EINVAL; |
1428 | ||
fdeb8e15 LW |
1429 | VALIDATE_DESC(desc); |
1430 | chip = desc->gdev->chip; | |
bcabdef1 | 1431 | |
be1a4b13 | 1432 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
1433 | gpiod_warn(desc, |
1434 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 1435 | __func__); |
be1a4b13 LW |
1436 | return -EIO; |
1437 | } | |
1438 | ||
d82da797 | 1439 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
1440 | if (status == 0) |
1441 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1442 | |
372e722e | 1443 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 1444 | |
d2876d08 DB |
1445 | return status; |
1446 | } | |
79a9becd | 1447 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1448 | |
ef70bbe1 | 1449 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 1450 | { |
d2876d08 | 1451 | struct gpio_chip *chip; |
d2876d08 DB |
1452 | int status = -EINVAL; |
1453 | ||
d468bf9e LW |
1454 | /* GPIOs used for IRQs shall not be set as output */ |
1455 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1456 | gpiod_err(desc, | |
1457 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1458 | __func__); | |
1459 | return -EIO; | |
1460 | } | |
1461 | ||
aca5ce14 LD |
1462 | /* Open drain pin should not be driven to 1 */ |
1463 | if (value && test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
372e722e | 1464 | return gpiod_direction_input(desc); |
aca5ce14 | 1465 | |
25553ff0 LD |
1466 | /* Open source pin should not be driven to 0 */ |
1467 | if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
372e722e | 1468 | return gpiod_direction_input(desc); |
25553ff0 | 1469 | |
fdeb8e15 | 1470 | chip = desc->gdev->chip; |
be1a4b13 | 1471 | if (!chip->set || !chip->direction_output) { |
6424de5a MB |
1472 | gpiod_warn(desc, |
1473 | "%s: missing set() or direction_output() operations\n", | |
1474 | __func__); | |
be1a4b13 LW |
1475 | return -EIO; |
1476 | } | |
1477 | ||
d82da797 | 1478 | status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value); |
d2876d08 DB |
1479 | if (status == 0) |
1480 | set_bit(FLAG_IS_OUT, &desc->flags); | |
372e722e AC |
1481 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1482 | trace_gpio_direction(desc_to_gpio(desc), 0, status); | |
d2876d08 DB |
1483 | return status; |
1484 | } | |
ef70bbe1 PZ |
1485 | |
1486 | /** | |
1487 | * gpiod_direction_output_raw - set the GPIO direction to output | |
1488 | * @desc: GPIO to set to output | |
1489 | * @value: initial output value of the GPIO | |
1490 | * | |
1491 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1492 | * be called safely on it. The initial value of the output must be specified | |
1493 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
1494 | * | |
1495 | * Return 0 in case of success, else an error code. | |
1496 | */ | |
1497 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
1498 | { | |
fdeb8e15 | 1499 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1500 | return _gpiod_direction_output_raw(desc, value); |
1501 | } | |
1502 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
1503 | ||
1504 | /** | |
90df4fe0 | 1505 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
1506 | * @desc: GPIO to set to output |
1507 | * @value: initial output value of the GPIO | |
1508 | * | |
1509 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1510 | * be called safely on it. The initial value of the output must be specified | |
1511 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1512 | * account. | |
1513 | * | |
1514 | * Return 0 in case of success, else an error code. | |
1515 | */ | |
1516 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
1517 | { | |
fdeb8e15 | 1518 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1519 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1520 | value = !value; | |
1521 | return _gpiod_direction_output_raw(desc, value); | |
1522 | } | |
79a9becd | 1523 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1524 | |
c4b5be98 | 1525 | /** |
79a9becd | 1526 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1527 | * @gpio: the gpio to set debounce time |
1528 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1529 | * |
1530 | * returns -ENOTSUPP if the controller does not support setting | |
1531 | * debounce. | |
c4b5be98 | 1532 | */ |
79a9becd | 1533 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 1534 | { |
c4b5be98 | 1535 | struct gpio_chip *chip; |
c4b5be98 | 1536 | |
fdeb8e15 LW |
1537 | VALIDATE_DESC(desc); |
1538 | chip = desc->gdev->chip; | |
be1a4b13 | 1539 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1540 | gpiod_dbg(desc, |
1541 | "%s: missing set() or set_debounce() operations\n", | |
1542 | __func__); | |
65d87656 | 1543 | return -ENOTSUPP; |
be1a4b13 LW |
1544 | } |
1545 | ||
d82da797 | 1546 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 1547 | } |
79a9becd | 1548 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1549 | |
79a9becd AC |
1550 | /** |
1551 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1552 | * @desc: the gpio descriptor to test | |
1553 | * | |
1554 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1555 | */ | |
1556 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1557 | { |
fdeb8e15 | 1558 | VALIDATE_DESC(desc); |
79a9becd | 1559 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1560 | } |
79a9becd | 1561 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1562 | |
1563 | /* I/O calls are only valid after configuration completed; the relevant | |
1564 | * "is this a valid GPIO" error checks should already have been done. | |
1565 | * | |
1566 | * "Get" operations are often inlinable as reading a pin value register, | |
1567 | * and masking the relevant bit in that register. | |
1568 | * | |
1569 | * When "set" operations are inlinable, they involve writing that mask to | |
1570 | * one register to set a low value, or a different register to set it high. | |
1571 | * Otherwise locking is needed, so there may be little value to inlining. | |
1572 | * | |
1573 | *------------------------------------------------------------------------ | |
1574 | * | |
1575 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1576 | * have requested the GPIO. That can include implicit requesting by | |
1577 | * a direction setting call. Marking a gpio as requested locks its chip | |
1578 | * in memory, guaranteeing that these table lookups need no more locking | |
1579 | * and that gpiochip_remove() will fail. | |
1580 | * | |
1581 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1582 | * that the GPIO was actually requested. | |
1583 | */ | |
1584 | ||
e20538b8 | 1585 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
1586 | { |
1587 | struct gpio_chip *chip; | |
372e722e | 1588 | int offset; |
e20538b8 | 1589 | int value; |
d2876d08 | 1590 | |
fdeb8e15 | 1591 | chip = desc->gdev->chip; |
372e722e | 1592 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 1593 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 1594 | value = value < 0 ? value : !!value; |
372e722e | 1595 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 1596 | return value; |
d2876d08 | 1597 | } |
372e722e | 1598 | |
d2876d08 | 1599 | /** |
79a9becd AC |
1600 | * gpiod_get_raw_value() - return a gpio's raw value |
1601 | * @desc: gpio whose value will be returned | |
d2876d08 | 1602 | * |
79a9becd | 1603 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 1604 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1605 | * |
1606 | * This function should be called from contexts where we cannot sleep, and will | |
1607 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1608 | */ |
79a9becd | 1609 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1610 | { |
fdeb8e15 | 1611 | VALIDATE_DESC(desc); |
e4e449e8 | 1612 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1613 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1614 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1615 | } |
79a9becd | 1616 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1617 | |
79a9becd AC |
1618 | /** |
1619 | * gpiod_get_value() - return a gpio's value | |
1620 | * @desc: gpio whose value will be returned | |
1621 | * | |
1622 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1623 | * account, or negative errno on failure. |
79a9becd AC |
1624 | * |
1625 | * This function should be called from contexts where we cannot sleep, and will | |
1626 | * complain if the GPIO chip functions potentially sleep. | |
1627 | */ | |
1628 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1629 | { |
79a9becd | 1630 | int value; |
fdeb8e15 LW |
1631 | |
1632 | VALIDATE_DESC(desc); | |
79a9becd | 1633 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1634 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1635 | |
1636 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1637 | if (value < 0) |
1638 | return value; | |
1639 | ||
79a9becd AC |
1640 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1641 | value = !value; | |
1642 | ||
1643 | return value; | |
372e722e | 1644 | } |
79a9becd | 1645 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1646 | |
aca5ce14 LD |
1647 | /* |
1648 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1649 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 1650 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 1651 | */ |
23600969 | 1652 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
1653 | { |
1654 | int err = 0; | |
fdeb8e15 | 1655 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1656 | int offset = gpio_chip_hwgpio(desc); |
1657 | ||
aca5ce14 | 1658 | if (value) { |
372e722e | 1659 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1660 | if (!err) |
372e722e | 1661 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1662 | } else { |
372e722e | 1663 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1664 | if (!err) |
372e722e | 1665 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1666 | } |
372e722e | 1667 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1668 | if (err < 0) |
6424de5a MB |
1669 | gpiod_err(desc, |
1670 | "%s: Error in set_value for open drain err %d\n", | |
1671 | __func__, err); | |
aca5ce14 LD |
1672 | } |
1673 | ||
25553ff0 | 1674 | /* |
79a9becd AC |
1675 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1676 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 1677 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 1678 | */ |
23600969 | 1679 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
1680 | { |
1681 | int err = 0; | |
fdeb8e15 | 1682 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1683 | int offset = gpio_chip_hwgpio(desc); |
1684 | ||
25553ff0 | 1685 | if (value) { |
372e722e | 1686 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1687 | if (!err) |
372e722e | 1688 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1689 | } else { |
372e722e | 1690 | err = chip->direction_input(chip, offset); |
25553ff0 | 1691 | if (!err) |
372e722e | 1692 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1693 | } |
372e722e | 1694 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1695 | if (err < 0) |
6424de5a MB |
1696 | gpiod_err(desc, |
1697 | "%s: Error in set_value for open source err %d\n", | |
1698 | __func__, err); | |
25553ff0 LD |
1699 | } |
1700 | ||
23600969 | 1701 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
1702 | { |
1703 | struct gpio_chip *chip; | |
1704 | ||
fdeb8e15 | 1705 | chip = desc->gdev->chip; |
372e722e AC |
1706 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1707 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1708 | _gpio_set_open_drain_value(desc, value); | |
1709 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1710 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 1711 | else |
372e722e AC |
1712 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
1713 | } | |
1714 | ||
5f424243 RI |
1715 | /* |
1716 | * set multiple outputs on the same chip; | |
1717 | * use the chip's set_multiple function if available; | |
1718 | * otherwise set the outputs sequentially; | |
1719 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
1720 | * defines which outputs are to be changed | |
1721 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
1722 | * defines the values the outputs specified by mask are to be set to | |
1723 | */ | |
1724 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
1725 | unsigned long *mask, unsigned long *bits) | |
1726 | { | |
1727 | if (chip->set_multiple) { | |
1728 | chip->set_multiple(chip, mask, bits); | |
1729 | } else { | |
1730 | int i; | |
1731 | for (i = 0; i < chip->ngpio; i++) { | |
1732 | if (mask[BIT_WORD(i)] == 0) { | |
1733 | /* no more set bits in this mask word; | |
1734 | * skip ahead to the next word */ | |
1735 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
1736 | continue; | |
1737 | } | |
1738 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 1739 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 1740 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
1741 | } |
1742 | } | |
1743 | } | |
1744 | ||
3fff99bc RI |
1745 | static void gpiod_set_array_value_priv(bool raw, bool can_sleep, |
1746 | unsigned int array_size, | |
1747 | struct gpio_desc **desc_array, | |
1748 | int *value_array) | |
5f424243 RI |
1749 | { |
1750 | int i = 0; | |
1751 | ||
1752 | while (i < array_size) { | |
fdeb8e15 | 1753 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
1754 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
1755 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
1756 | int count = 0; | |
1757 | ||
38e003f4 | 1758 | if (!can_sleep) |
5f424243 | 1759 | WARN_ON(chip->can_sleep); |
38e003f4 | 1760 | |
5f424243 RI |
1761 | memset(mask, 0, sizeof(mask)); |
1762 | do { | |
1763 | struct gpio_desc *desc = desc_array[i]; | |
1764 | int hwgpio = gpio_chip_hwgpio(desc); | |
1765 | int value = value_array[i]; | |
1766 | ||
1767 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1768 | value = !value; | |
1769 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1770 | /* | |
1771 | * collect all normal outputs belonging to the same chip | |
1772 | * open drain and open source outputs are set individually | |
1773 | */ | |
1774 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 1775 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
1776 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
1777 | _gpio_set_open_source_value(desc, value); | |
1778 | } else { | |
1779 | __set_bit(hwgpio, mask); | |
38e003f4 | 1780 | if (value) |
5f424243 | 1781 | __set_bit(hwgpio, bits); |
38e003f4 | 1782 | else |
5f424243 | 1783 | __clear_bit(hwgpio, bits); |
5f424243 RI |
1784 | count++; |
1785 | } | |
1786 | i++; | |
fdeb8e15 LW |
1787 | } while ((i < array_size) && |
1788 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 1789 | /* push collected bits to outputs */ |
38e003f4 | 1790 | if (count != 0) |
5f424243 | 1791 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
1792 | } |
1793 | } | |
1794 | ||
d2876d08 | 1795 | /** |
79a9becd AC |
1796 | * gpiod_set_raw_value() - assign a gpio's raw value |
1797 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1798 | * @value: value to assign |
d2876d08 | 1799 | * |
79a9becd AC |
1800 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1801 | * regard for its ACTIVE_LOW status. | |
1802 | * | |
1803 | * This function should be called from contexts where we cannot sleep, and will | |
1804 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1805 | */ |
79a9becd | 1806 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 1807 | { |
fdeb8e15 | 1808 | VALIDATE_DESC_VOID(desc); |
e4e449e8 | 1809 | /* Should be using gpio_set_value_cansleep() */ |
fdeb8e15 | 1810 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1811 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 1812 | } |
79a9becd | 1813 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
1814 | |
1815 | /** | |
79a9becd AC |
1816 | * gpiod_set_value() - assign a gpio's value |
1817 | * @desc: gpio whose value will be assigned | |
1818 | * @value: value to assign | |
1819 | * | |
1820 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1821 | * account | |
d2876d08 | 1822 | * |
79a9becd AC |
1823 | * This function should be called from contexts where we cannot sleep, and will |
1824 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1825 | */ |
79a9becd | 1826 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 1827 | { |
fdeb8e15 | 1828 | VALIDATE_DESC_VOID(desc); |
79a9becd | 1829 | /* Should be using gpio_set_value_cansleep() */ |
fdeb8e15 | 1830 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1831 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1832 | value = !value; | |
1833 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1834 | } |
79a9becd | 1835 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 1836 | |
5f424243 | 1837 | /** |
3fff99bc | 1838 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1839 | * @array_size: number of elements in the descriptor / value arrays |
1840 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1841 | * @value_array: array of values to assign | |
1842 | * | |
1843 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1844 | * without regard for their ACTIVE_LOW status. | |
1845 | * | |
1846 | * This function should be called from contexts where we cannot sleep, and will | |
1847 | * complain if the GPIO chip functions potentially sleep. | |
1848 | */ | |
3fff99bc | 1849 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
1850 | struct gpio_desc **desc_array, int *value_array) |
1851 | { | |
1852 | if (!desc_array) | |
1853 | return; | |
3fff99bc RI |
1854 | gpiod_set_array_value_priv(true, false, array_size, desc_array, |
1855 | value_array); | |
5f424243 | 1856 | } |
3fff99bc | 1857 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
1858 | |
1859 | /** | |
3fff99bc | 1860 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1861 | * @array_size: number of elements in the descriptor / value arrays |
1862 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1863 | * @value_array: array of values to assign | |
1864 | * | |
1865 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
1866 | * into account. | |
1867 | * | |
1868 | * This function should be called from contexts where we cannot sleep, and will | |
1869 | * complain if the GPIO chip functions potentially sleep. | |
1870 | */ | |
3fff99bc RI |
1871 | void gpiod_set_array_value(unsigned int array_size, |
1872 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
1873 | { |
1874 | if (!desc_array) | |
1875 | return; | |
3fff99bc RI |
1876 | gpiod_set_array_value_priv(false, false, array_size, desc_array, |
1877 | value_array); | |
5f424243 | 1878 | } |
3fff99bc | 1879 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 1880 | |
d2876d08 | 1881 | /** |
79a9becd AC |
1882 | * gpiod_cansleep() - report whether gpio value access may sleep |
1883 | * @desc: gpio to check | |
d2876d08 | 1884 | * |
d2876d08 | 1885 | */ |
79a9becd | 1886 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 1887 | { |
fdeb8e15 LW |
1888 | VALIDATE_DESC(desc); |
1889 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 1890 | } |
79a9becd | 1891 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 1892 | |
0f6d504e | 1893 | /** |
79a9becd AC |
1894 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
1895 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 1896 | * |
79a9becd AC |
1897 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
1898 | * error. | |
0f6d504e | 1899 | */ |
79a9becd | 1900 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e DB |
1901 | { |
1902 | struct gpio_chip *chip; | |
372e722e | 1903 | int offset; |
0f6d504e | 1904 | |
fdeb8e15 LW |
1905 | VALIDATE_DESC(desc); |
1906 | chip = desc->gdev->chip; | |
372e722e AC |
1907 | offset = gpio_chip_hwgpio(desc); |
1908 | return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO; | |
0f6d504e | 1909 | } |
79a9becd | 1910 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 1911 | |
d468bf9e | 1912 | /** |
e3a2e878 | 1913 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
1914 | * @chip: the chip the GPIO to lock belongs to |
1915 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1916 | * |
1917 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 1918 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 1919 | */ |
e3a2e878 | 1920 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 1921 | { |
d74be6df | 1922 | if (offset >= chip->ngpio) |
d468bf9e LW |
1923 | return -EINVAL; |
1924 | ||
1c3cdb18 | 1925 | if (test_bit(FLAG_IS_OUT, &chip->gpiodev->descs[offset].flags)) { |
d74be6df | 1926 | chip_err(chip, |
d468bf9e LW |
1927 | "%s: tried to flag a GPIO set as output for IRQ\n", |
1928 | __func__); | |
1929 | return -EIO; | |
1930 | } | |
1931 | ||
1c3cdb18 | 1932 | set_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 1933 | return 0; |
372e722e | 1934 | } |
e3a2e878 | 1935 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 1936 | |
d468bf9e | 1937 | /** |
e3a2e878 | 1938 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
1939 | * @chip: the chip the GPIO to lock belongs to |
1940 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1941 | * |
1942 | * This is used directly by GPIO drivers that want to indicate | |
1943 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 1944 | */ |
e3a2e878 | 1945 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 1946 | { |
d74be6df | 1947 | if (offset >= chip->ngpio) |
d468bf9e | 1948 | return; |
d2876d08 | 1949 | |
1c3cdb18 | 1950 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 1951 | } |
e3a2e878 | 1952 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 1953 | |
6cee3821 LW |
1954 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
1955 | { | |
1956 | if (offset >= chip->ngpio) | |
1957 | return false; | |
1958 | ||
1959 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
1960 | } | |
1961 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
1962 | ||
143b65d6 LW |
1963 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
1964 | { | |
1965 | if (offset >= chip->ngpio) | |
1966 | return false; | |
1967 | ||
1968 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
1969 | } | |
1970 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
1971 | ||
1972 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
1973 | { | |
1974 | if (offset >= chip->ngpio) | |
1975 | return false; | |
1976 | ||
1977 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
1978 | } | |
1979 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
1980 | ||
79a9becd AC |
1981 | /** |
1982 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
1983 | * @desc: gpio whose value will be returned | |
1984 | * | |
1985 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 1986 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1987 | * |
1988 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 1989 | */ |
79a9becd | 1990 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 1991 | { |
d2876d08 | 1992 | might_sleep_if(extra_checks); |
fdeb8e15 | 1993 | VALIDATE_DESC(desc); |
79a9becd | 1994 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1995 | } |
79a9becd | 1996 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 1997 | |
79a9becd AC |
1998 | /** |
1999 | * gpiod_get_value_cansleep() - return a gpio's value | |
2000 | * @desc: gpio whose value will be returned | |
2001 | * | |
2002 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2003 | * account, or negative errno on failure. |
79a9becd AC |
2004 | * |
2005 | * This function is to be called from contexts that can sleep. | |
2006 | */ | |
2007 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2008 | { |
3f397c21 | 2009 | int value; |
d2876d08 DB |
2010 | |
2011 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2012 | VALIDATE_DESC(desc); |
79a9becd | 2013 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
2014 | if (value < 0) |
2015 | return value; | |
2016 | ||
79a9becd AC |
2017 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2018 | value = !value; | |
2019 | ||
3f397c21 | 2020 | return value; |
d2876d08 | 2021 | } |
79a9becd | 2022 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2023 | |
79a9becd AC |
2024 | /** |
2025 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2026 | * @desc: gpio whose value will be assigned | |
2027 | * @value: value to assign | |
2028 | * | |
2029 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2030 | * regard for its ACTIVE_LOW status. | |
2031 | * | |
2032 | * This function is to be called from contexts that can sleep. | |
2033 | */ | |
2034 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2035 | { |
d2876d08 | 2036 | might_sleep_if(extra_checks); |
fdeb8e15 | 2037 | VALIDATE_DESC_VOID(desc); |
79a9becd | 2038 | _gpiod_set_raw_value(desc, value); |
372e722e | 2039 | } |
79a9becd | 2040 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2041 | |
79a9becd AC |
2042 | /** |
2043 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2044 | * @desc: gpio whose value will be assigned | |
2045 | * @value: value to assign | |
2046 | * | |
2047 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2048 | * account | |
2049 | * | |
2050 | * This function is to be called from contexts that can sleep. | |
2051 | */ | |
2052 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2053 | { |
d2876d08 | 2054 | might_sleep_if(extra_checks); |
fdeb8e15 | 2055 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2056 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2057 | value = !value; | |
2058 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2059 | } |
79a9becd | 2060 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2061 | |
5f424243 | 2062 | /** |
3fff99bc | 2063 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2064 | * @array_size: number of elements in the descriptor / value arrays |
2065 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2066 | * @value_array: array of values to assign | |
2067 | * | |
2068 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2069 | * without regard for their ACTIVE_LOW status. | |
2070 | * | |
2071 | * This function is to be called from contexts that can sleep. | |
2072 | */ | |
3fff99bc RI |
2073 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2074 | struct gpio_desc **desc_array, | |
2075 | int *value_array) | |
5f424243 RI |
2076 | { |
2077 | might_sleep_if(extra_checks); | |
2078 | if (!desc_array) | |
2079 | return; | |
3fff99bc RI |
2080 | gpiod_set_array_value_priv(true, true, array_size, desc_array, |
2081 | value_array); | |
5f424243 | 2082 | } |
3fff99bc | 2083 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2084 | |
2085 | /** | |
3fff99bc | 2086 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2087 | * @array_size: number of elements in the descriptor / value arrays |
2088 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2089 | * @value_array: array of values to assign | |
2090 | * | |
2091 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2092 | * into account. | |
2093 | * | |
2094 | * This function is to be called from contexts that can sleep. | |
2095 | */ | |
3fff99bc RI |
2096 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2097 | struct gpio_desc **desc_array, | |
2098 | int *value_array) | |
5f424243 RI |
2099 | { |
2100 | might_sleep_if(extra_checks); | |
2101 | if (!desc_array) | |
2102 | return; | |
3fff99bc RI |
2103 | gpiod_set_array_value_priv(false, true, array_size, desc_array, |
2104 | value_array); | |
5f424243 | 2105 | } |
3fff99bc | 2106 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2107 | |
bae48da2 | 2108 | /** |
ad824783 AC |
2109 | * gpiod_add_lookup_table() - register GPIO device consumers |
2110 | * @table: table of consumers to register | |
bae48da2 | 2111 | */ |
ad824783 | 2112 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2113 | { |
2114 | mutex_lock(&gpio_lookup_lock); | |
2115 | ||
ad824783 | 2116 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2117 | |
2118 | mutex_unlock(&gpio_lookup_lock); | |
2119 | } | |
2120 | ||
be9015ab SK |
2121 | /** |
2122 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2123 | * @table: table of consumers to unregister | |
2124 | */ | |
2125 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2126 | { | |
2127 | mutex_lock(&gpio_lookup_lock); | |
2128 | ||
2129 | list_del(&table->list); | |
2130 | ||
2131 | mutex_unlock(&gpio_lookup_lock); | |
2132 | } | |
2133 | ||
bae48da2 | 2134 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2135 | unsigned int idx, |
2136 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
2137 | { |
2138 | char prop_name[32]; /* 32 is max size of property name */ | |
2139 | enum of_gpio_flags of_flags; | |
2140 | struct gpio_desc *desc; | |
dd34c37a | 2141 | unsigned int i; |
bae48da2 | 2142 | |
7f2e553a | 2143 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 2144 | if (con_id) |
9e089246 | 2145 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 2146 | gpio_suffixes[i]); |
dd34c37a | 2147 | else |
9e089246 | 2148 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 2149 | gpio_suffixes[i]); |
bae48da2 | 2150 | |
dd34c37a TR |
2151 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
2152 | &of_flags); | |
06fc3b70 | 2153 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) |
dd34c37a TR |
2154 | break; |
2155 | } | |
bae48da2 AC |
2156 | |
2157 | if (IS_ERR(desc)) | |
2158 | return desc; | |
2159 | ||
2160 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 2161 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 | 2162 | |
90b665f6 LP |
2163 | if (of_flags & OF_GPIO_SINGLE_ENDED) { |
2164 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
2165 | *flags |= GPIO_OPEN_DRAIN; | |
2166 | else | |
2167 | *flags |= GPIO_OPEN_SOURCE; | |
2168 | } | |
2169 | ||
bae48da2 AC |
2170 | return desc; |
2171 | } | |
d2876d08 | 2172 | |
81f59e9d | 2173 | static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2174 | unsigned int idx, |
2175 | enum gpio_lookup_flags *flags) | |
372e722e | 2176 | { |
0d9a693c | 2177 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
2178 | struct acpi_gpio_info info; |
2179 | struct gpio_desc *desc; | |
0d9a693c MW |
2180 | char propname[32]; |
2181 | int i; | |
e01f440a | 2182 | |
0d9a693c | 2183 | /* Try first from _DSD */ |
7f2e553a | 2184 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
2185 | if (con_id && strcmp(con_id, "gpios")) { |
2186 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 2187 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
2188 | } else { |
2189 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 2190 | gpio_suffixes[i]); |
0d9a693c MW |
2191 | } |
2192 | ||
2193 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
2194 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
2195 | break; | |
2196 | } | |
2197 | ||
2198 | /* Then from plain _CRS GPIOs */ | |
2199 | if (IS_ERR(desc)) { | |
10cf4899 DT |
2200 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
2201 | return ERR_PTR(-ENOENT); | |
2202 | ||
0d9a693c MW |
2203 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); |
2204 | if (IS_ERR(desc)) | |
2205 | return desc; | |
2206 | } | |
e01f440a | 2207 | |
52044723 | 2208 | if (info.polarity == GPIO_ACTIVE_LOW) |
53e7cac3 | 2209 | *flags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
2210 | |
2211 | return desc; | |
81f59e9d MW |
2212 | } |
2213 | ||
ad824783 | 2214 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2215 | { |
2216 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2217 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2218 | |
2219 | mutex_lock(&gpio_lookup_lock); | |
2220 | ||
ad824783 AC |
2221 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2222 | if (table->dev_id && dev_id) { | |
2223 | /* | |
2224 | * Valid strings on both ends, must be identical to have | |
2225 | * a match | |
2226 | */ | |
2227 | if (!strcmp(table->dev_id, dev_id)) | |
2228 | goto found; | |
2229 | } else { | |
2230 | /* | |
2231 | * One of the pointers is NULL, so both must be to have | |
2232 | * a match | |
2233 | */ | |
2234 | if (dev_id == table->dev_id) | |
2235 | goto found; | |
2236 | } | |
2237 | } | |
2238 | table = NULL; | |
bae48da2 | 2239 | |
ad824783 AC |
2240 | found: |
2241 | mutex_unlock(&gpio_lookup_lock); | |
2242 | return table; | |
2243 | } | |
bae48da2 | 2244 | |
ad824783 AC |
2245 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2246 | unsigned int idx, | |
2247 | enum gpio_lookup_flags *flags) | |
2248 | { | |
2a3cf6a3 | 2249 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2250 | struct gpiod_lookup_table *table; |
2251 | struct gpiod_lookup *p; | |
bae48da2 | 2252 | |
ad824783 AC |
2253 | table = gpiod_find_lookup_table(dev); |
2254 | if (!table) | |
2255 | return desc; | |
bae48da2 | 2256 | |
ad824783 AC |
2257 | for (p = &table->table[0]; p->chip_label; p++) { |
2258 | struct gpio_chip *chip; | |
bae48da2 | 2259 | |
ad824783 | 2260 | /* idx must always match exactly */ |
bae48da2 AC |
2261 | if (p->idx != idx) |
2262 | continue; | |
2263 | ||
ad824783 AC |
2264 | /* If the lookup entry has a con_id, require exact match */ |
2265 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2266 | continue; | |
bae48da2 | 2267 | |
ad824783 | 2268 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2269 | |
ad824783 | 2270 | if (!chip) { |
2a3cf6a3 AC |
2271 | dev_err(dev, "cannot find GPIO chip %s\n", |
2272 | p->chip_label); | |
2273 | return ERR_PTR(-ENODEV); | |
ad824783 | 2274 | } |
bae48da2 | 2275 | |
ad824783 | 2276 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2277 | dev_err(dev, |
2278 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2279 | idx, chip->ngpio, chip->label); | |
2280 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2281 | } |
bae48da2 | 2282 | |
bb1e88cc | 2283 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2284 | *flags = p->flags; |
bae48da2 | 2285 | |
2a3cf6a3 | 2286 | return desc; |
bae48da2 AC |
2287 | } |
2288 | ||
bae48da2 AC |
2289 | return desc; |
2290 | } | |
2291 | ||
66858527 RI |
2292 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2293 | { | |
2294 | int ret; | |
2295 | char propname[32]; | |
2296 | unsigned int i; | |
2297 | ||
2298 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2299 | if (con_id) | |
2300 | snprintf(propname, sizeof(propname), "%s-%s", | |
2301 | con_id, gpio_suffixes[i]); | |
2302 | else | |
2303 | snprintf(propname, sizeof(propname), "%s", | |
2304 | gpio_suffixes[i]); | |
2305 | ||
2306 | ret = of_gpio_named_count(dev->of_node, propname); | |
2307 | if (ret >= 0) | |
2308 | break; | |
2309 | } | |
2310 | return ret; | |
2311 | } | |
2312 | ||
2313 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
2314 | { | |
2315 | struct gpiod_lookup_table *table; | |
2316 | struct gpiod_lookup *p; | |
2317 | unsigned int count = 0; | |
2318 | ||
2319 | table = gpiod_find_lookup_table(dev); | |
2320 | if (!table) | |
2321 | return -ENOENT; | |
2322 | ||
2323 | for (p = &table->table[0]; p->chip_label; p++) { | |
2324 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
2325 | (!con_id && !p->con_id)) | |
2326 | count++; | |
2327 | } | |
2328 | if (!count) | |
2329 | return -ENOENT; | |
2330 | ||
2331 | return count; | |
2332 | } | |
2333 | ||
2334 | /** | |
2335 | * gpiod_count - return the number of GPIOs associated with a device / function | |
2336 | * or -ENOENT if no GPIO has been assigned to the requested function | |
2337 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2338 | * @con_id: function within the GPIO consumer | |
2339 | */ | |
2340 | int gpiod_count(struct device *dev, const char *con_id) | |
2341 | { | |
2342 | int count = -ENOENT; | |
2343 | ||
2344 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
2345 | count = dt_gpio_count(dev, con_id); | |
2346 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
2347 | count = acpi_gpio_count(dev, con_id); | |
2348 | ||
2349 | if (count < 0) | |
2350 | count = platform_gpio_count(dev, con_id); | |
2351 | ||
2352 | return count; | |
2353 | } | |
2354 | EXPORT_SYMBOL_GPL(gpiod_count); | |
2355 | ||
bae48da2 | 2356 | /** |
0879162f | 2357 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 2358 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 2359 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 2360 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2361 | * |
2362 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 2363 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 2364 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 2365 | */ |
b17d1bf1 | 2366 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 2367 | enum gpiod_flags flags) |
bae48da2 | 2368 | { |
39b2bbe3 | 2369 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 2370 | } |
b17d1bf1 | 2371 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 2372 | |
29a1f233 TR |
2373 | /** |
2374 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
2375 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2376 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 2377 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2378 | * |
2379 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
2380 | * the requested function it will return NULL. This is convenient for drivers | |
2381 | * that need to handle optional GPIOs. | |
2382 | */ | |
b17d1bf1 | 2383 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
2384 | const char *con_id, |
2385 | enum gpiod_flags flags) | |
29a1f233 | 2386 | { |
39b2bbe3 | 2387 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 2388 | } |
b17d1bf1 | 2389 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 2390 | |
923b93e4 LP |
2391 | /** |
2392 | * gpiod_parse_flags - helper function to parse GPIO lookup flags | |
2393 | * @desc: gpio to be setup | |
2394 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2395 | * of_get_gpio_hog() | |
2396 | * | |
2397 | * Set the GPIO descriptor flags based on the given GPIO lookup flags. | |
2398 | */ | |
2399 | static void gpiod_parse_flags(struct gpio_desc *desc, unsigned long lflags) | |
2400 | { | |
2401 | if (lflags & GPIO_ACTIVE_LOW) | |
2402 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2403 | if (lflags & GPIO_OPEN_DRAIN) | |
2404 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2405 | if (lflags & GPIO_OPEN_SOURCE) | |
2406 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2407 | } | |
f625d460 BP |
2408 | |
2409 | /** | |
2410 | * gpiod_configure_flags - helper function to configure a given GPIO | |
2411 | * @desc: gpio whose value will be assigned | |
2412 | * @con_id: function within the GPIO consumer | |
f625d460 BP |
2413 | * @dflags: gpiod_flags - optional GPIO initialization flags |
2414 | * | |
2415 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
2416 | * requested function and/or index, or another IS_ERR() code if an error | |
2417 | * occurred while trying to acquire the GPIO. | |
2418 | */ | |
2419 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
923b93e4 | 2420 | enum gpiod_flags dflags) |
f625d460 BP |
2421 | { |
2422 | int status; | |
2423 | ||
f625d460 BP |
2424 | /* No particular flag request, return here... */ |
2425 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
2426 | pr_debug("no flags found for %s\n", con_id); | |
2427 | return 0; | |
2428 | } | |
2429 | ||
2430 | /* Process flags */ | |
2431 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
2432 | status = gpiod_direction_output(desc, | |
2433 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
2434 | else | |
2435 | status = gpiod_direction_input(desc); | |
2436 | ||
2437 | return status; | |
2438 | } | |
2439 | ||
bae48da2 AC |
2440 | /** |
2441 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 2442 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
2443 | * @con_id: function within the GPIO consumer |
2444 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2445 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2446 | * |
2447 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2448 | * defined one for functions that define several GPIOs. | |
2449 | * | |
2a3cf6a3 AC |
2450 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
2451 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 2452 | * occurred while trying to acquire the GPIO. |
bae48da2 | 2453 | */ |
b17d1bf1 | 2454 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 2455 | const char *con_id, |
39b2bbe3 AC |
2456 | unsigned int idx, |
2457 | enum gpiod_flags flags) | |
bae48da2 | 2458 | { |
35c5d7fd | 2459 | struct gpio_desc *desc = NULL; |
bae48da2 | 2460 | int status; |
39b2bbe3 | 2461 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
2462 | |
2463 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2464 | ||
4d8440b9 RW |
2465 | if (dev) { |
2466 | /* Using device tree? */ | |
2467 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
2468 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2469 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
2470 | } else if (ACPI_COMPANION(dev)) { | |
2471 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
2472 | desc = acpi_find_gpio(dev, con_id, idx, &lookupflags); | |
2473 | } | |
35c5d7fd AC |
2474 | } |
2475 | ||
2476 | /* | |
2477 | * Either we are not using DT or ACPI, or their lookup did not return | |
2478 | * a result. In that case, use platform lookup as a fallback. | |
2479 | */ | |
2a3cf6a3 | 2480 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 2481 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 2482 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
2483 | } |
2484 | ||
2485 | if (IS_ERR(desc)) { | |
351cfe0f | 2486 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
2487 | return desc; |
2488 | } | |
2489 | ||
923b93e4 LP |
2490 | gpiod_parse_flags(desc, lookupflags); |
2491 | ||
bae48da2 | 2492 | status = gpiod_request(desc, con_id); |
bae48da2 AC |
2493 | if (status < 0) |
2494 | return ERR_PTR(status); | |
2495 | ||
923b93e4 | 2496 | status = gpiod_configure_flags(desc, con_id, flags); |
39b2bbe3 AC |
2497 | if (status < 0) { |
2498 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
2499 | gpiod_put(desc); | |
2500 | return ERR_PTR(status); | |
2501 | } | |
2502 | ||
bae48da2 AC |
2503 | return desc; |
2504 | } | |
b17d1bf1 | 2505 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 2506 | |
40b73183 MW |
2507 | /** |
2508 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
2509 | * @fwnode: handle of the firmware node | |
2510 | * @propname: name of the firmware property representing the GPIO | |
2511 | * | |
2512 | * This function can be used for drivers that get their configuration | |
2513 | * from firmware. | |
2514 | * | |
2515 | * Function properly finds the corresponding GPIO using whatever is the | |
2516 | * underlying firmware interface and then makes sure that the GPIO | |
2517 | * descriptor is requested before it is returned to the caller. | |
2518 | * | |
2519 | * In case of error an ERR_PTR() is returned. | |
2520 | */ | |
2521 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
2522 | const char *propname) | |
2523 | { | |
2524 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2525 | bool active_low = false; | |
90b665f6 | 2526 | bool single_ended = false; |
40b73183 MW |
2527 | int ret; |
2528 | ||
2529 | if (!fwnode) | |
2530 | return ERR_PTR(-EINVAL); | |
2531 | ||
2532 | if (is_of_node(fwnode)) { | |
2533 | enum of_gpio_flags flags; | |
2534 | ||
c181fb3e | 2535 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 2536 | &flags); |
90b665f6 | 2537 | if (!IS_ERR(desc)) { |
40b73183 | 2538 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
2539 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
2540 | } | |
40b73183 MW |
2541 | } else if (is_acpi_node(fwnode)) { |
2542 | struct acpi_gpio_info info; | |
2543 | ||
504a3374 | 2544 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 2545 | if (!IS_ERR(desc)) |
52044723 | 2546 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
2547 | } |
2548 | ||
2549 | if (IS_ERR(desc)) | |
2550 | return desc; | |
2551 | ||
40b73183 MW |
2552 | if (active_low) |
2553 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2554 | ||
90b665f6 LP |
2555 | if (single_ended) { |
2556 | if (active_low) | |
2557 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2558 | else | |
2559 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2560 | } | |
2561 | ||
923b93e4 LP |
2562 | ret = gpiod_request(desc, NULL); |
2563 | if (ret) | |
2564 | return ERR_PTR(ret); | |
2565 | ||
40b73183 MW |
2566 | return desc; |
2567 | } | |
2568 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
2569 | ||
29a1f233 TR |
2570 | /** |
2571 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
2572 | * function | |
2573 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2574 | * @con_id: function within the GPIO consumer | |
2575 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2576 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2577 | * |
2578 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
2579 | * specified index was assigned to the requested function it will return NULL. | |
2580 | * This is convenient for drivers that need to handle optional GPIOs. | |
2581 | */ | |
b17d1bf1 | 2582 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 2583 | const char *con_id, |
39b2bbe3 AC |
2584 | unsigned int index, |
2585 | enum gpiod_flags flags) | |
29a1f233 TR |
2586 | { |
2587 | struct gpio_desc *desc; | |
2588 | ||
39b2bbe3 | 2589 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
2590 | if (IS_ERR(desc)) { |
2591 | if (PTR_ERR(desc) == -ENOENT) | |
2592 | return NULL; | |
2593 | } | |
2594 | ||
2595 | return desc; | |
2596 | } | |
b17d1bf1 | 2597 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 2598 | |
f625d460 BP |
2599 | /** |
2600 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
2601 | * @desc: gpio whose value will be assigned | |
2602 | * @name: gpio line name | |
2603 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2604 | * of_get_gpio_hog() | |
2605 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2606 | */ | |
2607 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
2608 | unsigned long lflags, enum gpiod_flags dflags) | |
2609 | { | |
2610 | struct gpio_chip *chip; | |
2611 | struct gpio_desc *local_desc; | |
2612 | int hwnum; | |
2613 | int status; | |
2614 | ||
2615 | chip = gpiod_to_chip(desc); | |
2616 | hwnum = gpio_chip_hwgpio(desc); | |
2617 | ||
923b93e4 LP |
2618 | gpiod_parse_flags(desc, lflags); |
2619 | ||
f625d460 BP |
2620 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); |
2621 | if (IS_ERR(local_desc)) { | |
a713890d LW |
2622 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed\n", |
2623 | name, chip->label, hwnum); | |
f625d460 BP |
2624 | return PTR_ERR(local_desc); |
2625 | } | |
2626 | ||
923b93e4 | 2627 | status = gpiod_configure_flags(desc, name, dflags); |
f625d460 | 2628 | if (status < 0) { |
a713890d LW |
2629 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed\n", |
2630 | name, chip->label, hwnum); | |
f625d460 BP |
2631 | gpiochip_free_own_desc(desc); |
2632 | return status; | |
2633 | } | |
2634 | ||
2635 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
2636 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
2637 | ||
2638 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
2639 | desc_to_gpio(desc), name, | |
2640 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
2641 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
2642 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
2643 | ||
2644 | return 0; | |
2645 | } | |
2646 | ||
2647 | /** | |
2648 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
2649 | * @chip: gpio chip to act on | |
2650 | * | |
2651 | * This is only used by of_gpiochip_remove to free hogged gpios | |
2652 | */ | |
2653 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
2654 | { | |
2655 | int id; | |
2656 | ||
2657 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
2658 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
2659 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
2660 | } |
2661 | } | |
2662 | ||
66858527 RI |
2663 | /** |
2664 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
2665 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2666 | * @con_id: function within the GPIO consumer | |
2667 | * @flags: optional GPIO initialization flags | |
2668 | * | |
2669 | * This function acquires all the GPIOs defined under a given function. | |
2670 | * | |
2671 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
2672 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
2673 | * code if an error occurred while trying to acquire the GPIOs. | |
2674 | */ | |
2675 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
2676 | const char *con_id, | |
2677 | enum gpiod_flags flags) | |
2678 | { | |
2679 | struct gpio_desc *desc; | |
2680 | struct gpio_descs *descs; | |
2681 | int count; | |
2682 | ||
2683 | count = gpiod_count(dev, con_id); | |
2684 | if (count < 0) | |
2685 | return ERR_PTR(count); | |
2686 | ||
2687 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
2688 | GFP_KERNEL); | |
2689 | if (!descs) | |
2690 | return ERR_PTR(-ENOMEM); | |
2691 | ||
2692 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
2693 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
2694 | if (IS_ERR(desc)) { | |
2695 | gpiod_put_array(descs); | |
2696 | return ERR_CAST(desc); | |
2697 | } | |
2698 | descs->desc[descs->ndescs] = desc; | |
2699 | descs->ndescs++; | |
2700 | } | |
2701 | return descs; | |
2702 | } | |
2703 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
2704 | ||
2705 | /** | |
2706 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
2707 | * function | |
2708 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2709 | * @con_id: function within the GPIO consumer | |
2710 | * @flags: optional GPIO initialization flags | |
2711 | * | |
2712 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
2713 | * assigned to the requested function it will return NULL. | |
2714 | */ | |
2715 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
2716 | const char *con_id, | |
2717 | enum gpiod_flags flags) | |
2718 | { | |
2719 | struct gpio_descs *descs; | |
2720 | ||
2721 | descs = gpiod_get_array(dev, con_id, flags); | |
2722 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
2723 | return NULL; | |
2724 | ||
2725 | return descs; | |
2726 | } | |
2727 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
2728 | ||
bae48da2 AC |
2729 | /** |
2730 | * gpiod_put - dispose of a GPIO descriptor | |
2731 | * @desc: GPIO descriptor to dispose of | |
2732 | * | |
2733 | * No descriptor can be used after gpiod_put() has been called on it. | |
2734 | */ | |
2735 | void gpiod_put(struct gpio_desc *desc) | |
2736 | { | |
2737 | gpiod_free(desc); | |
372e722e | 2738 | } |
bae48da2 | 2739 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 2740 | |
66858527 RI |
2741 | /** |
2742 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
2743 | * @descs: struct gpio_descs containing an array of descriptors | |
2744 | */ | |
2745 | void gpiod_put_array(struct gpio_descs *descs) | |
2746 | { | |
2747 | unsigned int i; | |
2748 | ||
2749 | for (i = 0; i < descs->ndescs; i++) | |
2750 | gpiod_put(descs->desc[i]); | |
2751 | ||
2752 | kfree(descs); | |
2753 | } | |
2754 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
2755 | ||
3c702e99 LW |
2756 | static int __init gpiolib_dev_init(void) |
2757 | { | |
2758 | int ret; | |
2759 | ||
2760 | /* Register GPIO sysfs bus */ | |
2761 | ret = bus_register(&gpio_bus_type); | |
2762 | if (ret < 0) { | |
2763 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
2764 | return ret; | |
2765 | } | |
2766 | ||
2767 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
2768 | if (ret < 0) { | |
2769 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
2770 | bus_unregister(&gpio_bus_type); | |
2771 | } | |
2772 | return ret; | |
2773 | } | |
2774 | core_initcall(gpiolib_dev_init); | |
2775 | ||
d2876d08 DB |
2776 | #ifdef CONFIG_DEBUG_FS |
2777 | ||
fdeb8e15 | 2778 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
2779 | { |
2780 | unsigned i; | |
fdeb8e15 LW |
2781 | struct gpio_chip *chip = gdev->chip; |
2782 | unsigned gpio = gdev->base; | |
2783 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 2784 | int is_out; |
d468bf9e | 2785 | int is_irq; |
d2876d08 | 2786 | |
fdeb8e15 | 2787 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
2788 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
2789 | if (gdesc->name) { | |
2790 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
2791 | gpio, gdesc->name); | |
2792 | } | |
d2876d08 | 2793 | continue; |
ced433e2 | 2794 | } |
d2876d08 | 2795 | |
372e722e | 2796 | gpiod_get_direction(gdesc); |
d2876d08 | 2797 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 2798 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
2799 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
2800 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
2801 | is_out ? "out" : "in ", |
2802 | chip->get | |
2803 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2804 | : "? ", |
2805 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2806 | seq_printf(s, "\n"); |
2807 | } | |
2808 | } | |
2809 | ||
f9c4a31f | 2810 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2811 | { |
362432ae | 2812 | unsigned long flags; |
ff2b1359 | 2813 | struct gpio_device *gdev = NULL; |
cb1650d4 | 2814 | loff_t index = *pos; |
d2876d08 | 2815 | |
f9c4a31f | 2816 | s->private = ""; |
d2876d08 | 2817 | |
362432ae | 2818 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 2819 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
2820 | if (index-- == 0) { |
2821 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 2822 | return gdev; |
f9c4a31f | 2823 | } |
362432ae | 2824 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 2825 | |
cb1650d4 | 2826 | return NULL; |
f9c4a31f TR |
2827 | } |
2828 | ||
2829 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2830 | { | |
362432ae | 2831 | unsigned long flags; |
ff2b1359 | 2832 | struct gpio_device *gdev = v; |
f9c4a31f TR |
2833 | void *ret = NULL; |
2834 | ||
362432ae | 2835 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 2836 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
2837 | ret = NULL; |
2838 | else | |
ff2b1359 | 2839 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 2840 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
2841 | |
2842 | s->private = "\n"; | |
2843 | ++*pos; | |
2844 | ||
2845 | return ret; | |
2846 | } | |
2847 | ||
2848 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
2849 | { | |
2850 | } | |
2851 | ||
2852 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
2853 | { | |
ff2b1359 LW |
2854 | struct gpio_device *gdev = v; |
2855 | struct gpio_chip *chip = gdev->chip; | |
2856 | struct device *parent; | |
2857 | ||
2858 | if (!chip) { | |
2859 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
2860 | dev_name(&gdev->dev)); | |
2861 | return 0; | |
2862 | } | |
f9c4a31f | 2863 | |
ff2b1359 LW |
2864 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
2865 | dev_name(&gdev->dev), | |
fdeb8e15 | 2866 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
2867 | parent = chip->parent; |
2868 | if (parent) | |
2869 | seq_printf(s, ", parent: %s/%s", | |
2870 | parent->bus ? parent->bus->name : "no-bus", | |
2871 | dev_name(parent)); | |
f9c4a31f TR |
2872 | if (chip->label) |
2873 | seq_printf(s, ", %s", chip->label); | |
2874 | if (chip->can_sleep) | |
2875 | seq_printf(s, ", can sleep"); | |
2876 | seq_printf(s, ":\n"); | |
2877 | ||
2878 | if (chip->dbg_show) | |
2879 | chip->dbg_show(s, chip); | |
2880 | else | |
fdeb8e15 | 2881 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 2882 | |
d2876d08 DB |
2883 | return 0; |
2884 | } | |
2885 | ||
f9c4a31f TR |
2886 | static const struct seq_operations gpiolib_seq_ops = { |
2887 | .start = gpiolib_seq_start, | |
2888 | .next = gpiolib_seq_next, | |
2889 | .stop = gpiolib_seq_stop, | |
2890 | .show = gpiolib_seq_show, | |
2891 | }; | |
2892 | ||
d2876d08 DB |
2893 | static int gpiolib_open(struct inode *inode, struct file *file) |
2894 | { | |
f9c4a31f | 2895 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
2896 | } |
2897 | ||
828c0950 | 2898 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 2899 | .owner = THIS_MODULE, |
d2876d08 DB |
2900 | .open = gpiolib_open, |
2901 | .read = seq_read, | |
2902 | .llseek = seq_lseek, | |
f9c4a31f | 2903 | .release = seq_release, |
d2876d08 DB |
2904 | }; |
2905 | ||
2906 | static int __init gpiolib_debugfs_init(void) | |
2907 | { | |
2908 | /* /sys/kernel/debug/gpio */ | |
2909 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
2910 | NULL, NULL, &gpiolib_operations); | |
2911 | return 0; | |
2912 | } | |
2913 | subsys_initcall(gpiolib_debugfs_init); | |
2914 | ||
2915 | #endif /* DEBUG_FS */ |