Commit | Line | Data |
---|---|---|
d2876d08 DB |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
ff77c352 | 3 | #include <linux/interrupt.h> |
d2876d08 DB |
4 | #include <linux/irq.h> |
5 | #include <linux/spinlock.h> | |
1a989d0f | 6 | #include <linux/list.h> |
d8f388d8 DB |
7 | #include <linux/device.h> |
8 | #include <linux/err.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/gpio.h> | |
391c970c | 12 | #include <linux/of_gpio.h> |
ff77c352 | 13 | #include <linux/idr.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7b199811 | 15 | #include <linux/acpi.h> |
53e7cac3 | 16 | #include <linux/gpio/driver.h> |
0a6d3158 | 17 | #include <linux/gpio/machine.h> |
c771c2f4 | 18 | #include <linux/pinctrl/consumer.h> |
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 | ||
159f3cd9 | 71 | static bool gpiolib_initialized; |
6d86750c | 72 | |
d2876d08 DB |
73 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
74 | { | |
d2876d08 | 75 | d->label = label; |
d2876d08 DB |
76 | } |
77 | ||
372e722e AC |
78 | /** |
79 | * Convert a GPIO number to its descriptor | |
80 | */ | |
79a9becd | 81 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 82 | { |
ff2b1359 | 83 | struct gpio_device *gdev; |
14e85c0e AC |
84 | unsigned long flags; |
85 | ||
86 | spin_lock_irqsave(&gpio_lock, flags); | |
87 | ||
ff2b1359 | 88 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
89 | if (gdev->base <= gpio && |
90 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 91 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 92 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
93 | } |
94 | } | |
95 | ||
96 | spin_unlock_irqrestore(&gpio_lock, flags); | |
97 | ||
0e9a5edf AC |
98 | if (!gpio_is_valid(gpio)) |
99 | WARN(1, "invalid GPIO %d\n", gpio); | |
100 | ||
14e85c0e | 101 | return NULL; |
372e722e | 102 | } |
79a9becd | 103 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 104 | |
d468bf9e | 105 | /** |
bb1e88cc | 106 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 107 | */ |
bb1e88cc AC |
108 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
109 | u16 hwnum) | |
d468bf9e | 110 | { |
fdeb8e15 LW |
111 | struct gpio_device *gdev = chip->gpiodev; |
112 | ||
113 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 114 | return ERR_PTR(-EINVAL); |
d468bf9e | 115 | |
fdeb8e15 | 116 | return &gdev->descs[hwnum]; |
d468bf9e | 117 | } |
372e722e AC |
118 | |
119 | /** | |
120 | * Convert a GPIO descriptor to the integer namespace. | |
121 | * This should disappear in the future but is needed since we still | |
122 | * use GPIO numbers for error messages and sysfs nodes | |
123 | */ | |
79a9becd | 124 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 125 | { |
fdeb8e15 | 126 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 127 | } |
79a9becd | 128 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
129 | |
130 | ||
79a9becd AC |
131 | /** |
132 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
133 | * @desc: descriptor to return the chip of | |
134 | */ | |
135 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 136 | { |
fdeb8e15 LW |
137 | if (!desc || !desc->gdev || !desc->gdev->chip) |
138 | return NULL; | |
139 | return desc->gdev->chip; | |
372e722e | 140 | } |
79a9becd | 141 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 142 | |
8d0aab2f AV |
143 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
144 | static int gpiochip_find_base(int ngpio) | |
145 | { | |
ff2b1359 | 146 | struct gpio_device *gdev; |
83cabe33 | 147 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 148 | |
ff2b1359 | 149 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 150 | /* found a free space? */ |
fdeb8e15 | 151 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
152 | break; |
153 | else | |
154 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 155 | base = gdev->base - ngpio; |
8d0aab2f AV |
156 | } |
157 | ||
83cabe33 | 158 | if (gpio_is_valid(base)) { |
8d0aab2f | 159 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
160 | return base; |
161 | } else { | |
162 | pr_err("%s: cannot find free range\n", __func__); | |
163 | return -ENOSPC; | |
169b6a7a | 164 | } |
169b6a7a AV |
165 | } |
166 | ||
79a9becd AC |
167 | /** |
168 | * gpiod_get_direction - return the current direction of a GPIO | |
169 | * @desc: GPIO to get the direction of | |
170 | * | |
171 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
172 | * | |
173 | * This function may sleep if gpiod_cansleep() is true. | |
174 | */ | |
8e53b0f1 | 175 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
176 | { |
177 | struct gpio_chip *chip; | |
372e722e | 178 | unsigned offset; |
80b0a602 MN |
179 | int status = -EINVAL; |
180 | ||
372e722e AC |
181 | chip = gpiod_to_chip(desc); |
182 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
183 | |
184 | if (!chip->get_direction) | |
185 | return status; | |
186 | ||
372e722e | 187 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
188 | if (status > 0) { |
189 | /* GPIOF_DIR_IN, or other positive */ | |
190 | status = 1; | |
8e53b0f1 | 191 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
192 | } |
193 | if (status == 0) { | |
194 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 195 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
196 | } |
197 | return status; | |
198 | } | |
79a9becd | 199 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 200 | |
1a989d0f AC |
201 | /* |
202 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 203 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
204 | * |
205 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
206 | * space. | |
207 | */ | |
ff2b1359 | 208 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 209 | { |
a961f9b4 | 210 | struct gpio_device *prev, *next; |
1a989d0f | 211 | |
ff2b1359 | 212 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 213 | /* initial entry in list */ |
ff2b1359 | 214 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 215 | return 0; |
1a989d0f AC |
216 | } |
217 | ||
a961f9b4 BJZ |
218 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
219 | if (gdev->base + gdev->ngpio <= next->base) { | |
220 | /* add before first entry */ | |
221 | list_add(&gdev->list, &gpio_devices); | |
222 | return 0; | |
1a989d0f AC |
223 | } |
224 | ||
a961f9b4 BJZ |
225 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
226 | if (prev->base + prev->ngpio <= gdev->base) { | |
227 | /* add behind last entry */ | |
228 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 229 | return 0; |
1a989d0f AC |
230 | } |
231 | ||
a961f9b4 BJZ |
232 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
233 | /* at the end of the list */ | |
234 | if (&next->list == &gpio_devices) | |
235 | break; | |
1a989d0f | 236 | |
a961f9b4 BJZ |
237 | /* add between prev and next */ |
238 | if (prev->base + prev->ngpio <= gdev->base | |
239 | && gdev->base + gdev->ngpio <= next->base) { | |
240 | list_add(&gdev->list, &prev->list); | |
241 | return 0; | |
242 | } | |
243 | } | |
244 | ||
245 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
246 | return -EBUSY; | |
1a989d0f AC |
247 | } |
248 | ||
f881bab0 LW |
249 | /** |
250 | * Convert a GPIO name to its descriptor | |
251 | */ | |
252 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
253 | { | |
ff2b1359 | 254 | struct gpio_device *gdev; |
f881bab0 LW |
255 | unsigned long flags; |
256 | ||
257 | spin_lock_irqsave(&gpio_lock, flags); | |
258 | ||
ff2b1359 | 259 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
260 | int i; |
261 | ||
fdeb8e15 LW |
262 | for (i = 0; i != gdev->ngpio; ++i) { |
263 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 264 | |
fdeb8e15 | 265 | if (!desc->name || !name) |
f881bab0 LW |
266 | continue; |
267 | ||
fdeb8e15 | 268 | if (!strcmp(desc->name, name)) { |
f881bab0 | 269 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 270 | return desc; |
f881bab0 LW |
271 | } |
272 | } | |
273 | } | |
274 | ||
275 | spin_unlock_irqrestore(&gpio_lock, flags); | |
276 | ||
277 | return NULL; | |
278 | } | |
279 | ||
5f3ca732 MP |
280 | /* |
281 | * Takes the names from gc->names and checks if they are all unique. If they | |
282 | * are, they are assigned to their gpio descriptors. | |
283 | * | |
ed37915c | 284 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
285 | */ |
286 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
287 | { | |
fdeb8e15 | 288 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
289 | int i; |
290 | ||
291 | if (!gc->names) | |
292 | return 0; | |
293 | ||
294 | /* First check all names if they are unique */ | |
295 | for (i = 0; i != gc->ngpio; ++i) { | |
296 | struct gpio_desc *gpio; | |
297 | ||
298 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 299 | if (gpio) |
fdeb8e15 | 300 | dev_warn(&gdev->dev, |
34ffd85d | 301 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 302 | gc->names[i]); |
5f3ca732 MP |
303 | } |
304 | ||
305 | /* Then add all names to the GPIO descriptors */ | |
306 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 307 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
308 | |
309 | return 0; | |
310 | } | |
311 | ||
3c702e99 LW |
312 | /** |
313 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
314 | */ | |
315 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
316 | { | |
317 | struct gpio_device *gdev = filp->private_data; | |
318 | struct gpio_chip *chip = gdev->chip; | |
319 | int __user *ip = (int __user *)arg; | |
3c702e99 LW |
320 | |
321 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
322 | if (!chip) | |
323 | return -ENODEV; | |
324 | ||
521a2ad6 | 325 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 326 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
327 | struct gpiochip_info chipinfo; |
328 | ||
3c702e99 LW |
329 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
330 | sizeof(chipinfo.name)); | |
331 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
332 | strncpy(chipinfo.label, gdev->label, |
333 | sizeof(chipinfo.label)); | |
334 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 335 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
336 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
337 | return -EFAULT; | |
338 | return 0; | |
521a2ad6 LW |
339 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
340 | struct gpioline_info lineinfo; | |
341 | struct gpio_desc *desc; | |
342 | ||
343 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
344 | return -EFAULT; | |
345 | if (lineinfo.line_offset > gdev->ngpio) | |
346 | return -EINVAL; | |
347 | ||
348 | desc = &gdev->descs[lineinfo.line_offset]; | |
349 | if (desc->name) { | |
350 | strncpy(lineinfo.name, desc->name, | |
351 | sizeof(lineinfo.name)); | |
352 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
353 | } else { | |
354 | lineinfo.name[0] = '\0'; | |
355 | } | |
356 | if (desc->label) { | |
214338e3 LW |
357 | strncpy(lineinfo.consumer, desc->label, |
358 | sizeof(lineinfo.consumer)); | |
359 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 360 | } else { |
214338e3 | 361 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
362 | } |
363 | ||
364 | /* | |
365 | * Userspace only need to know that the kernel is using | |
366 | * this GPIO so it can't use it. | |
367 | */ | |
368 | lineinfo.flags = 0; | |
9d8cc89c LW |
369 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
370 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
371 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
372 | test_bit(FLAG_EXPORT, &desc->flags) || | |
373 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 374 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 375 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 376 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 377 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 378 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 379 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 380 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 381 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
382 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
383 | ||
384 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
385 | return -EFAULT; | |
386 | return 0; | |
3c702e99 LW |
387 | } |
388 | return -EINVAL; | |
389 | } | |
390 | ||
391 | /** | |
392 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
393 | * @inode: inode for this chardev | |
394 | * @filp: file struct for storing private data | |
395 | * Returns 0 on success | |
396 | */ | |
397 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
398 | { | |
399 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
400 | struct gpio_device, chrdev); | |
401 | ||
402 | /* Fail on open if the backing gpiochip is gone */ | |
403 | if (!gdev || !gdev->chip) | |
404 | return -ENODEV; | |
405 | get_device(&gdev->dev); | |
406 | filp->private_data = gdev; | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /** | |
411 | * gpio_chrdev_release() - close chardev after ioctl operations | |
412 | * @inode: inode for this chardev | |
413 | * @filp: file struct for storing private data | |
414 | * Returns 0 on success | |
415 | */ | |
416 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
417 | { | |
418 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
419 | struct gpio_device, chrdev); | |
420 | ||
421 | if (!gdev) | |
422 | return -ENODEV; | |
423 | put_device(&gdev->dev); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | ||
428 | static const struct file_operations gpio_fileops = { | |
429 | .release = gpio_chrdev_release, | |
430 | .open = gpio_chrdev_open, | |
431 | .owner = THIS_MODULE, | |
432 | .llseek = noop_llseek, | |
433 | .unlocked_ioctl = gpio_ioctl, | |
434 | .compat_ioctl = gpio_ioctl, | |
435 | }; | |
436 | ||
ff2b1359 LW |
437 | static void gpiodevice_release(struct device *dev) |
438 | { | |
439 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
440 | ||
3c702e99 | 441 | cdev_del(&gdev->chrdev); |
ff2b1359 LW |
442 | list_del(&gdev->list); |
443 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
444 | kfree(gdev->label); |
445 | kfree(gdev->descs); | |
9efd9e69 | 446 | kfree(gdev); |
ff2b1359 LW |
447 | } |
448 | ||
159f3cd9 GR |
449 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
450 | { | |
451 | int status; | |
452 | ||
453 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
454 | gdev->chrdev.owner = THIS_MODULE; | |
455 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
456 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
457 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
458 | if (status < 0) | |
459 | chip_warn(gdev->chip, "failed to add char device %d:%d\n", | |
460 | MAJOR(gpio_devt), gdev->id); | |
461 | else | |
462 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
463 | MAJOR(gpio_devt), gdev->id); | |
464 | status = device_add(&gdev->dev); | |
465 | if (status) | |
466 | goto err_remove_chardev; | |
467 | ||
468 | status = gpiochip_sysfs_register(gdev); | |
469 | if (status) | |
470 | goto err_remove_device; | |
471 | ||
472 | /* From this point, the .release() function cleans up gpio_device */ | |
473 | gdev->dev.release = gpiodevice_release; | |
474 | get_device(&gdev->dev); | |
475 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", | |
476 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
477 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
478 | ||
479 | return 0; | |
480 | ||
481 | err_remove_device: | |
482 | device_del(&gdev->dev); | |
483 | err_remove_chardev: | |
484 | cdev_del(&gdev->chrdev); | |
485 | return status; | |
486 | } | |
487 | ||
488 | static void gpiochip_setup_devs(void) | |
489 | { | |
490 | struct gpio_device *gdev; | |
491 | int err; | |
492 | ||
493 | list_for_each_entry(gdev, &gpio_devices, list) { | |
494 | err = gpiochip_setup_dev(gdev); | |
495 | if (err) | |
496 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
497 | dev_name(&gdev->dev), err); | |
498 | } | |
499 | } | |
500 | ||
d2876d08 | 501 | /** |
b08ea35a | 502 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 503 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 504 | * Context: potentially before irqs will work |
d2876d08 DB |
505 | * |
506 | * Returns a negative errno if the chip can't be registered, such as | |
507 | * because the chip->base is invalid or already associated with a | |
508 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 509 | * |
b08ea35a | 510 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 511 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
512 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
513 | * for GPIOs will fail rudely. | |
514 | * | |
159f3cd9 GR |
515 | * gpiochip_add_data() must only be called after gpiolib initialization, |
516 | * ie after core_initcall(). | |
517 | * | |
8d0aab2f AV |
518 | * If chip->base is negative, this requests dynamic assignment of |
519 | * a range of valid GPIOs. | |
d2876d08 | 520 | */ |
b08ea35a | 521 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
522 | { |
523 | unsigned long flags; | |
524 | int status = 0; | |
ff2b1359 | 525 | unsigned i; |
8d0aab2f | 526 | int base = chip->base; |
ff2b1359 | 527 | struct gpio_device *gdev; |
d2876d08 | 528 | |
ff2b1359 LW |
529 | /* |
530 | * First: allocate and populate the internal stat container, and | |
531 | * set up the struct device. | |
532 | */ | |
969f07b4 | 533 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 534 | if (!gdev) |
14e85c0e | 535 | return -ENOMEM; |
3c702e99 | 536 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
537 | gdev->chip = chip; |
538 | chip->gpiodev = gdev; | |
539 | if (chip->parent) { | |
540 | gdev->dev.parent = chip->parent; | |
541 | gdev->dev.of_node = chip->parent->of_node; | |
542 | } else { | |
543 | #ifdef CONFIG_OF_GPIO | |
544 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
545 | if (chip->of_node) | |
546 | gdev->dev.of_node = chip->of_node; | |
547 | #endif | |
548 | } | |
549 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); | |
550 | if (gdev->id < 0) { | |
551 | status = gdev->id; | |
552 | goto err_free_gdev; | |
553 | } | |
554 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
555 | device_initialize(&gdev->dev); | |
556 | dev_set_drvdata(&gdev->dev, gdev); | |
557 | if (chip->parent && chip->parent->driver) | |
558 | gdev->owner = chip->parent->driver->owner; | |
559 | else if (chip->owner) | |
560 | /* TODO: remove chip->owner */ | |
561 | gdev->owner = chip->owner; | |
562 | else | |
563 | gdev->owner = THIS_MODULE; | |
d2876d08 | 564 | |
476e2fc5 | 565 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 566 | if (!gdev->descs) { |
ff2b1359 LW |
567 | status = -ENOMEM; |
568 | goto err_free_gdev; | |
569 | } | |
570 | ||
5ed41cc4 BJZ |
571 | if (chip->ngpio == 0) { |
572 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 573 | status = -EINVAL; |
159f3cd9 | 574 | goto err_free_descs; |
5ed41cc4 | 575 | } |
df4878e9 LW |
576 | |
577 | if (chip->label) | |
476e2fc5 | 578 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 579 | else |
476e2fc5 | 580 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
581 | if (!gdev->label) { |
582 | status = -ENOMEM; | |
476e2fc5 | 583 | goto err_free_descs; |
df4878e9 LW |
584 | } |
585 | ||
fdeb8e15 | 586 | gdev->ngpio = chip->ngpio; |
43c54eca | 587 | gdev->data = data; |
5ed41cc4 | 588 | |
d2876d08 DB |
589 | spin_lock_irqsave(&gpio_lock, flags); |
590 | ||
fdeb8e15 LW |
591 | /* |
592 | * TODO: this allocates a Linux GPIO number base in the global | |
593 | * GPIO numberspace for this chip. In the long run we want to | |
594 | * get *rid* of this numberspace and use only descriptors, but | |
595 | * it may be a pipe dream. It will not happen before we get rid | |
596 | * of the sysfs interface anyways. | |
597 | */ | |
8d0aab2f AV |
598 | if (base < 0) { |
599 | base = gpiochip_find_base(chip->ngpio); | |
600 | if (base < 0) { | |
601 | status = base; | |
225fce83 | 602 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 603 | goto err_free_label; |
8d0aab2f | 604 | } |
fdeb8e15 LW |
605 | /* |
606 | * TODO: it should not be necessary to reflect the assigned | |
607 | * base outside of the GPIO subsystem. Go over drivers and | |
608 | * see if anyone makes use of this, else drop this and assign | |
609 | * a poison instead. | |
610 | */ | |
8d0aab2f AV |
611 | chip->base = base; |
612 | } | |
fdeb8e15 | 613 | gdev->base = base; |
8d0aab2f | 614 | |
ff2b1359 | 615 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
616 | if (status) { |
617 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 618 | goto err_free_label; |
05aa5203 | 619 | } |
1a989d0f | 620 | |
ff2b1359 | 621 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 622 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 623 | |
fdeb8e15 | 624 | desc->gdev = gdev; |
72d32000 LW |
625 | /* |
626 | * REVISIT: most hardware initializes GPIOs as inputs | |
627 | * (often with pullups enabled) so power usage is | |
628 | * minimized. Linux code should set the gpio direction | |
629 | * first thing; but until it does, and in case | |
630 | * chip->get_direction is not set, we may expose the | |
631 | * wrong direction in sysfs. | |
05aa5203 | 632 | */ |
72d32000 LW |
633 | |
634 | if (chip->get_direction) { | |
635 | /* | |
636 | * If we have .get_direction, set up the initial | |
637 | * direction flag from the hardware. | |
638 | */ | |
639 | int dir = chip->get_direction(chip, i); | |
640 | ||
641 | if (!dir) | |
642 | set_bit(FLAG_IS_OUT, &desc->flags); | |
643 | } else if (!chip->direction_input) { | |
644 | /* | |
645 | * If the chip lacks the .direction_input callback | |
646 | * we logically assume all lines are outputs. | |
647 | */ | |
648 | set_bit(FLAG_IS_OUT, &desc->flags); | |
649 | } | |
d2876d08 | 650 | } |
14e85c0e | 651 | |
3bae4811 ZG |
652 | spin_unlock_irqrestore(&gpio_lock, flags); |
653 | ||
f23f1516 | 654 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 655 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
656 | #endif |
657 | ||
5f3ca732 MP |
658 | status = gpiochip_set_desc_names(chip); |
659 | if (status) | |
660 | goto err_remove_from_list; | |
661 | ||
28355f81 TV |
662 | status = of_gpiochip_add(chip); |
663 | if (status) | |
664 | goto err_remove_chip; | |
665 | ||
664e3e5a | 666 | acpi_gpiochip_add(chip); |
391c970c | 667 | |
3c702e99 LW |
668 | /* |
669 | * By first adding the chardev, and then adding the device, | |
670 | * we get a device node entry in sysfs under | |
671 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
672 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
673 | * We can do this only if gpiolib has been initialized. |
674 | * Otherwise, defer until later. | |
3c702e99 | 675 | */ |
159f3cd9 GR |
676 | if (gpiolib_initialized) { |
677 | status = gpiochip_setup_dev(gdev); | |
678 | if (status) | |
679 | goto err_remove_chip; | |
680 | } | |
cedb1881 | 681 | return 0; |
3bae4811 | 682 | |
225fce83 JH |
683 | err_remove_chip: |
684 | acpi_gpiochip_remove(chip); | |
6d86750c | 685 | gpiochip_free_hogs(chip); |
225fce83 | 686 | of_gpiochip_remove(chip); |
5f3ca732 | 687 | err_remove_from_list: |
225fce83 | 688 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 689 | list_del(&gdev->list); |
3bae4811 | 690 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
691 | err_free_label: |
692 | kfree(gdev->label); | |
693 | err_free_descs: | |
694 | kfree(gdev->descs); | |
ff2b1359 LW |
695 | err_free_gdev: |
696 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 697 | /* failures here can mean systems won't boot... */ |
7589e59f | 698 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
699 | gdev->base, gdev->base + gdev->ngpio - 1, |
700 | chip->label ? : "generic"); | |
701 | kfree(gdev); | |
d2876d08 DB |
702 | return status; |
703 | } | |
b08ea35a | 704 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 705 | |
43c54eca LW |
706 | /** |
707 | * gpiochip_get_data() - get per-subdriver data for the chip | |
708 | */ | |
709 | void *gpiochip_get_data(struct gpio_chip *chip) | |
710 | { | |
711 | return chip->gpiodev->data; | |
712 | } | |
713 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
714 | ||
d2876d08 DB |
715 | /** |
716 | * gpiochip_remove() - unregister a gpio_chip | |
717 | * @chip: the chip to unregister | |
718 | * | |
719 | * A gpio_chip with any GPIOs still requested may not be removed. | |
720 | */ | |
e1db1706 | 721 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 722 | { |
ff2b1359 | 723 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 724 | struct gpio_desc *desc; |
d2876d08 | 725 | unsigned long flags; |
1c3cdb18 | 726 | unsigned i; |
fab28b89 | 727 | bool requested = false; |
d2876d08 | 728 | |
ff2b1359 | 729 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 730 | gpiochip_sysfs_unregister(gdev); |
bd203bd5 BJZ |
731 | /* Numb the device, cancelling all outstanding operations */ |
732 | gdev->chip = NULL; | |
00acc3dc | 733 | gpiochip_irqchip_remove(chip); |
6072b9dc | 734 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 735 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 736 | gpiochip_free_hogs(chip); |
391c970c | 737 | of_gpiochip_remove(chip); |
43c54eca LW |
738 | /* |
739 | * We accept no more calls into the driver from this point, so | |
740 | * NULL the driver data pointer | |
741 | */ | |
742 | gdev->data = NULL; | |
391c970c | 743 | |
6798acaa | 744 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 745 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 746 | desc = &gdev->descs[i]; |
fab28b89 JH |
747 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
748 | requested = true; | |
d2876d08 | 749 | } |
d2876d08 | 750 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 751 | |
fab28b89 | 752 | if (requested) |
fdeb8e15 | 753 | dev_crit(&gdev->dev, |
58383c78 | 754 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 755 | |
ff2b1359 LW |
756 | /* |
757 | * The gpiochip side puts its use of the device to rest here: | |
758 | * if there are no userspace clients, the chardev and device will | |
759 | * be removed, else it will be dangling until the last user is | |
760 | * gone. | |
761 | */ | |
762 | put_device(&gdev->dev); | |
d2876d08 DB |
763 | } |
764 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
765 | ||
0cf3292c LD |
766 | static void devm_gpio_chip_release(struct device *dev, void *res) |
767 | { | |
768 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
769 | ||
770 | gpiochip_remove(chip); | |
771 | } | |
772 | ||
773 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
774 | ||
775 | { | |
776 | struct gpio_chip **r = res; | |
777 | ||
778 | if (!r || !*r) { | |
779 | WARN_ON(!r || !*r); | |
780 | return 0; | |
781 | } | |
782 | ||
783 | return *r == data; | |
784 | } | |
785 | ||
786 | /** | |
787 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
788 | * @dev: the device pointer on which irq_chip belongs to. | |
789 | * @chip: the chip to register, with chip->base initialized | |
790 | * Context: potentially before irqs will work | |
791 | * | |
792 | * Returns a negative errno if the chip can't be registered, such as | |
793 | * because the chip->base is invalid or already associated with a | |
794 | * different chip. Otherwise it returns zero as a success code. | |
795 | * | |
796 | * The gpio chip automatically be released when the device is unbound. | |
797 | */ | |
798 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
799 | void *data) | |
800 | { | |
801 | struct gpio_chip **ptr; | |
802 | int ret; | |
803 | ||
804 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
805 | GFP_KERNEL); | |
806 | if (!ptr) | |
807 | return -ENOMEM; | |
808 | ||
809 | ret = gpiochip_add_data(chip, data); | |
810 | if (ret < 0) { | |
811 | devres_free(ptr); | |
812 | return ret; | |
813 | } | |
814 | ||
815 | *ptr = chip; | |
816 | devres_add(dev, ptr); | |
817 | ||
818 | return 0; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
821 | ||
822 | /** | |
823 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
824 | * @dev: device for which which resource was allocated | |
825 | * @chip: the chip to remove | |
826 | * | |
827 | * A gpio_chip with any GPIOs still requested may not be removed. | |
828 | */ | |
829 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
830 | { | |
831 | int ret; | |
832 | ||
833 | ret = devres_release(dev, devm_gpio_chip_release, | |
834 | devm_gpio_chip_match, chip); | |
835 | if (!ret) | |
836 | WARN_ON(ret); | |
837 | } | |
838 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
839 | ||
594fa265 GL |
840 | /** |
841 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
842 | * @data: data to pass to match function | |
843 | * @callback: Callback function to check gpio_chip | |
844 | * | |
845 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
846 | * determined by a user supplied @match callback. The callback should return | |
847 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
848 | * non-zero, this function will return to the caller and not iterate over any | |
849 | * more gpio_chips. | |
850 | */ | |
07ce8ec7 | 851 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 852 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 853 | void *data)) |
594fa265 | 854 | { |
ff2b1359 | 855 | struct gpio_device *gdev; |
125eef96 | 856 | struct gpio_chip *chip; |
594fa265 | 857 | unsigned long flags; |
594fa265 GL |
858 | |
859 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 LW |
860 | list_for_each_entry(gdev, &gpio_devices, list) |
861 | if (match(gdev->chip, data)) | |
594fa265 | 862 | break; |
125eef96 AC |
863 | |
864 | /* No match? */ | |
ff2b1359 | 865 | if (&gdev->list == &gpio_devices) |
125eef96 | 866 | chip = NULL; |
ff2b1359 LW |
867 | else |
868 | chip = gdev->chip; | |
869 | ||
594fa265 GL |
870 | spin_unlock_irqrestore(&gpio_lock, flags); |
871 | ||
872 | return chip; | |
873 | } | |
8fa0c9bf | 874 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 875 | |
79697ef9 AC |
876 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
877 | { | |
878 | const char *name = data; | |
879 | ||
880 | return !strcmp(chip->label, name); | |
881 | } | |
882 | ||
883 | static struct gpio_chip *find_chip_by_name(const char *name) | |
884 | { | |
885 | return gpiochip_find((void *)name, gpiochip_match_name); | |
886 | } | |
887 | ||
14250520 LW |
888 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
889 | ||
890 | /* | |
891 | * The following is irqchip helper code for gpiochips. | |
892 | */ | |
893 | ||
894 | /** | |
3f97d5fc LW |
895 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
896 | * @gpiochip: the gpiochip to set the irqchip chain to | |
897 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
898 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
899 | * chained irqchip | |
900 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
901 | * coming out of the gpiochip. If the interrupt is nested rather than |
902 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
903 | */ |
904 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
905 | struct irq_chip *irqchip, | |
906 | int parent_irq, | |
907 | irq_flow_handler_t parent_handler) | |
908 | { | |
83141a77 LW |
909 | unsigned int offset; |
910 | ||
83141a77 LW |
911 | if (!gpiochip->irqdomain) { |
912 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
913 | __func__); | |
1c8732bb LW |
914 | return; |
915 | } | |
916 | ||
3f97d5fc LW |
917 | if (parent_handler) { |
918 | if (gpiochip->can_sleep) { | |
919 | chip_err(gpiochip, | |
920 | "you cannot have chained interrupts on a " | |
921 | "chip that may sleep\n"); | |
922 | return; | |
923 | } | |
3f97d5fc LW |
924 | /* |
925 | * The parent irqchip is already using the chip_data for this | |
926 | * irqchip, so our callbacks simply use the handler_data. | |
927 | */ | |
f7f87753 TG |
928 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
929 | gpiochip); | |
25e4fe92 DES |
930 | |
931 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 932 | } |
83141a77 LW |
933 | |
934 | /* Set the parent IRQ for all affected IRQs */ | |
935 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
936 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
937 | parent_irq); | |
14250520 LW |
938 | } |
939 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
940 | ||
941 | /** | |
942 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
943 | * @d: the irqdomain used by this irqchip | |
944 | * @irq: the global irq number used by this GPIO irqchip irq | |
945 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
946 | * | |
947 | * This function will set up the mapping for a certain IRQ line on a | |
948 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
949 | * stored inside the gpiochip. | |
950 | */ | |
951 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
952 | irq_hw_number_t hwirq) | |
953 | { | |
954 | struct gpio_chip *chip = d->host_data; | |
955 | ||
14250520 | 956 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
957 | /* |
958 | * This lock class tells lockdep that GPIO irqs are in a different | |
959 | * category than their parents, so it won't report false recursion. | |
960 | */ | |
961 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 962 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 963 | /* Chips that can sleep need nested thread handlers */ |
295494af | 964 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 965 | irq_set_nested_thread(irq, 1); |
14250520 | 966 | irq_set_noprobe(irq); |
23393d49 | 967 | |
1333b90f LW |
968 | /* |
969 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
970 | * is passed as default type. | |
971 | */ | |
972 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
973 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
974 | |
975 | return 0; | |
976 | } | |
977 | ||
c3626fde LW |
978 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
979 | { | |
1c8732bb LW |
980 | struct gpio_chip *chip = d->host_data; |
981 | ||
1c8732bb LW |
982 | if (chip->can_sleep) |
983 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
984 | irq_set_chip_and_handler(irq, NULL, NULL); |
985 | irq_set_chip_data(irq, NULL); | |
986 | } | |
987 | ||
14250520 LW |
988 | static const struct irq_domain_ops gpiochip_domain_ops = { |
989 | .map = gpiochip_irq_map, | |
c3626fde | 990 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
991 | /* Virtually all GPIO irqchips are twocell:ed */ |
992 | .xlate = irq_domain_xlate_twocell, | |
993 | }; | |
994 | ||
995 | static int gpiochip_irq_reqres(struct irq_data *d) | |
996 | { | |
997 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
998 | ||
ff2b1359 | 999 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1000 | return -ENODEV; |
1001 | ||
e3a2e878 | 1002 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1003 | chip_err(chip, |
1004 | "unable to lock HW IRQ %lu for IRQ\n", | |
1005 | d->hwirq); | |
ff2b1359 | 1006 | module_put(chip->gpiodev->owner); |
14250520 LW |
1007 | return -EINVAL; |
1008 | } | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static void gpiochip_irq_relres(struct irq_data *d) | |
1013 | { | |
1014 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1015 | ||
e3a2e878 | 1016 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1017 | module_put(chip->gpiodev->owner); |
14250520 LW |
1018 | } |
1019 | ||
1020 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1021 | { | |
1022 | return irq_find_mapping(chip->irqdomain, offset); | |
1023 | } | |
1024 | ||
1025 | /** | |
1026 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1027 | * @gpiochip: the gpiochip to remove the irqchip from | |
1028 | * | |
1029 | * This is called only from gpiochip_remove() | |
1030 | */ | |
1031 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1032 | { | |
c3626fde LW |
1033 | unsigned int offset; |
1034 | ||
afa82fab MW |
1035 | acpi_gpiochip_free_interrupts(gpiochip); |
1036 | ||
25e4fe92 DES |
1037 | if (gpiochip->irq_parent) { |
1038 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
1039 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
1040 | } | |
1041 | ||
c3626fde LW |
1042 | /* Remove all IRQ mappings and delete the domain */ |
1043 | if (gpiochip->irqdomain) { | |
1044 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
1045 | irq_dispose_mapping( |
1046 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 1047 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 1048 | } |
14250520 LW |
1049 | |
1050 | if (gpiochip->irqchip) { | |
1051 | gpiochip->irqchip->irq_request_resources = NULL; | |
1052 | gpiochip->irqchip->irq_release_resources = NULL; | |
1053 | gpiochip->irqchip = NULL; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
1059 | * @gpiochip: the gpiochip to add the irqchip to | |
1060 | * @irqchip: the irqchip to add to the gpiochip | |
1061 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1062 | * allocate gpiochip irqs from | |
1063 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1064 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1065 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 1066 | * @lock_key: lockdep class |
14250520 LW |
1067 | * |
1068 | * This function closely associates a certain irqchip with a certain | |
1069 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1070 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1071 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1072 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1073 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1074 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1075 | * translation. The gpiochip will need to be initialized and registered | |
1076 | * before calling this function. | |
1077 | * | |
c3626fde LW |
1078 | * This function will handle two cell:ed simple IRQs and assumes all |
1079 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1080 | * need to be open coded. |
1081 | */ | |
a0a8bcf4 GS |
1082 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
1083 | struct irq_chip *irqchip, | |
1084 | unsigned int first_irq, | |
1085 | irq_flow_handler_t handler, | |
1086 | unsigned int type, | |
1087 | struct lock_class_key *lock_key) | |
14250520 LW |
1088 | { |
1089 | struct device_node *of_node; | |
1090 | unsigned int offset; | |
c3626fde | 1091 | unsigned irq_base = 0; |
14250520 LW |
1092 | |
1093 | if (!gpiochip || !irqchip) | |
1094 | return -EINVAL; | |
1095 | ||
58383c78 | 1096 | if (!gpiochip->parent) { |
14250520 LW |
1097 | pr_err("missing gpiochip .dev parent pointer\n"); |
1098 | return -EINVAL; | |
1099 | } | |
58383c78 | 1100 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1101 | #ifdef CONFIG_OF_GPIO |
1102 | /* | |
20a8a968 | 1103 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1104 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1105 | * everywhere | |
14250520 LW |
1106 | */ |
1107 | if (gpiochip->of_node) | |
1108 | of_node = gpiochip->of_node; | |
1109 | #endif | |
1110 | gpiochip->irqchip = irqchip; | |
1111 | gpiochip->irq_handler = handler; | |
1112 | gpiochip->irq_default_type = type; | |
1113 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 1114 | gpiochip->lock_key = lock_key; |
14250520 LW |
1115 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1116 | gpiochip->ngpio, first_irq, | |
1117 | &gpiochip_domain_ops, gpiochip); | |
1118 | if (!gpiochip->irqdomain) { | |
1119 | gpiochip->irqchip = NULL; | |
1120 | return -EINVAL; | |
1121 | } | |
8b67a1f0 RV |
1122 | |
1123 | /* | |
1124 | * It is possible for a driver to override this, but only if the | |
1125 | * alternative functions are both implemented. | |
1126 | */ | |
1127 | if (!irqchip->irq_request_resources && | |
1128 | !irqchip->irq_release_resources) { | |
1129 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1130 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1131 | } | |
14250520 LW |
1132 | |
1133 | /* | |
1134 | * Prepare the mapping since the irqchip shall be orthogonal to | |
1135 | * any gpiochip calls. If the first_irq was zero, this is | |
1136 | * necessary to allocate descriptors for all IRQs. | |
1137 | */ | |
c3626fde LW |
1138 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1139 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
1140 | if (offset == 0) | |
1141 | /* | |
1142 | * Store the base into the gpiochip to be used when | |
1143 | * unmapping the irqs. | |
1144 | */ | |
1145 | gpiochip->irq_base = irq_base; | |
1146 | } | |
14250520 | 1147 | |
afa82fab MW |
1148 | acpi_gpiochip_request_interrupts(gpiochip); |
1149 | ||
14250520 LW |
1150 | return 0; |
1151 | } | |
a0a8bcf4 | 1152 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
1153 | |
1154 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1155 | ||
1156 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
1157 | ||
1158 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1159 | ||
c771c2f4 JG |
1160 | /** |
1161 | * gpiochip_generic_request() - request the gpio function for a pin | |
1162 | * @chip: the gpiochip owning the GPIO | |
1163 | * @offset: the offset of the GPIO to request for GPIO function | |
1164 | */ | |
1165 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1166 | { | |
fdeb8e15 | 1167 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1168 | } |
1169 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1170 | ||
1171 | /** | |
1172 | * gpiochip_generic_free() - free the gpio function from a pin | |
1173 | * @chip: the gpiochip to request the gpio function for | |
1174 | * @offset: the offset of the GPIO to free from GPIO function | |
1175 | */ | |
1176 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1177 | { | |
fdeb8e15 | 1178 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1179 | } |
1180 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1181 | ||
f23f1516 | 1182 | #ifdef CONFIG_PINCTRL |
165adc9c | 1183 | |
586a87e6 CR |
1184 | /** |
1185 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1186 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1187 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1188 | * @gpio_offset: the start offset in the current gpio_chip number space |
1189 | * @pin_group: name of the pin group inside the pin controller | |
1190 | */ | |
1191 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1192 | struct pinctrl_dev *pctldev, | |
1193 | unsigned int gpio_offset, const char *pin_group) | |
1194 | { | |
1195 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1196 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1197 | int ret; |
1198 | ||
1199 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1200 | if (!pin_range) { | |
1a2a99c6 | 1201 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1202 | return -ENOMEM; |
1203 | } | |
1204 | ||
1205 | /* Use local offset as range ID */ | |
1206 | pin_range->range.id = gpio_offset; | |
1207 | pin_range->range.gc = chip; | |
1208 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1209 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1210 | pin_range->pctldev = pctldev; |
1211 | ||
1212 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1213 | &pin_range->range.pins, | |
1214 | &pin_range->range.npins); | |
61c6375d MN |
1215 | if (ret < 0) { |
1216 | kfree(pin_range); | |
586a87e6 | 1217 | return ret; |
61c6375d | 1218 | } |
586a87e6 CR |
1219 | |
1220 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1221 | ||
1a2a99c6 AS |
1222 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1223 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1224 | pinctrl_dev_get_devname(pctldev), pin_group); |
1225 | ||
20ec3e39 | 1226 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1227 | |
1228 | return 0; | |
1229 | } | |
1230 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1231 | ||
3f0f8670 LW |
1232 | /** |
1233 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1234 | * @chip: the gpiochip to add the range for | |
1235 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1236 | * @gpio_offset: the start offset in the current gpio_chip number space |
1237 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1238 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1239 | * pin controller) to accumulate in this range | |
1240 | */ | |
1e63d7b9 | 1241 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1242 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1243 | unsigned int npins) |
f23f1516 SH |
1244 | { |
1245 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1246 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1247 | int ret; |
f23f1516 | 1248 | |
3f0f8670 | 1249 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1250 | if (!pin_range) { |
1a2a99c6 | 1251 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1252 | return -ENOMEM; |
f23f1516 SH |
1253 | } |
1254 | ||
3f0f8670 | 1255 | /* Use local offset as range ID */ |
316511c0 | 1256 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1257 | pin_range->range.gc = chip; |
f23f1516 | 1258 | pin_range->range.name = chip->label; |
fdeb8e15 | 1259 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1260 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1261 | pin_range->range.npins = npins; |
192c369c | 1262 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1263 | &pin_range->range); |
8f23ca1a | 1264 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1265 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1266 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1267 | kfree(pin_range); |
b4d4b1f0 | 1268 | return ret; |
3f0f8670 | 1269 | } |
1a2a99c6 AS |
1270 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1271 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1272 | pinctl_name, |
1273 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1274 | |
20ec3e39 | 1275 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1276 | |
1277 | return 0; | |
f23f1516 | 1278 | } |
165adc9c | 1279 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1280 | |
3f0f8670 LW |
1281 | /** |
1282 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1283 | * @chip: the chip to remove all the mappings for | |
1284 | */ | |
f23f1516 SH |
1285 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1286 | { | |
1287 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1288 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1289 | |
20ec3e39 | 1290 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1291 | list_del(&pin_range->node); |
1292 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1293 | &pin_range->range); | |
3f0f8670 | 1294 | kfree(pin_range); |
f23f1516 SH |
1295 | } |
1296 | } | |
165adc9c LW |
1297 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1298 | ||
1299 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1300 | |
d2876d08 DB |
1301 | /* These "optional" allocation calls help prevent drivers from stomping |
1302 | * on each other, and help provide better diagnostics in debugfs. | |
1303 | * They're called even less than the "set direction" calls. | |
1304 | */ | |
77c2d792 | 1305 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1306 | { |
fdeb8e15 | 1307 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1308 | int status; |
d2876d08 DB |
1309 | unsigned long flags; |
1310 | ||
bcabdef1 AC |
1311 | spin_lock_irqsave(&gpio_lock, flags); |
1312 | ||
d2876d08 | 1313 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1314 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1315 | */ |
1316 | ||
1317 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1318 | desc_set_label(desc, label ? : "?"); | |
1319 | status = 0; | |
438d8908 | 1320 | } else { |
d2876d08 | 1321 | status = -EBUSY; |
7460db56 | 1322 | goto done; |
35e8bb51 DB |
1323 | } |
1324 | ||
1325 | if (chip->request) { | |
1326 | /* chip->request may sleep */ | |
1327 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1328 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1329 | spin_lock_irqsave(&gpio_lock, flags); |
1330 | ||
1331 | if (status < 0) { | |
1332 | desc_set_label(desc, NULL); | |
35e8bb51 | 1333 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1334 | goto done; |
35e8bb51 | 1335 | } |
438d8908 | 1336 | } |
80b0a602 MN |
1337 | if (chip->get_direction) { |
1338 | /* chip->get_direction may sleep */ | |
1339 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1340 | gpiod_get_direction(desc); |
80b0a602 MN |
1341 | spin_lock_irqsave(&gpio_lock, flags); |
1342 | } | |
77c2d792 | 1343 | done: |
923b93e4 LP |
1344 | if (status < 0) { |
1345 | /* Clear flags that might have been set by the caller before | |
1346 | * requesting the GPIO. | |
1347 | */ | |
1348 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
1349 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
1350 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
1351 | } | |
77c2d792 MW |
1352 | spin_unlock_irqrestore(&gpio_lock, flags); |
1353 | return status; | |
1354 | } | |
1355 | ||
fdeb8e15 LW |
1356 | /* |
1357 | * This descriptor validation needs to be inserted verbatim into each | |
1358 | * function taking a descriptor, so we need to use a preprocessor | |
1359 | * macro to avoid endless duplication. | |
1360 | */ | |
1361 | #define VALIDATE_DESC(desc) do { \ | |
1362 | if (!desc || !desc->gdev) { \ | |
1363 | pr_warn("%s: invalid GPIO\n", __func__); \ | |
1364 | return -EINVAL; \ | |
1365 | } \ | |
1366 | if ( !desc->gdev->chip ) { \ | |
1367 | dev_warn(&desc->gdev->dev, \ | |
1368 | "%s: backing chip is gone\n", __func__); \ | |
1369 | return 0; \ | |
1370 | } } while (0) | |
1371 | ||
1372 | #define VALIDATE_DESC_VOID(desc) do { \ | |
1373 | if (!desc || !desc->gdev) { \ | |
1374 | pr_warn("%s: invalid GPIO\n", __func__); \ | |
1375 | return; \ | |
1376 | } \ | |
1377 | if (!desc->gdev->chip) { \ | |
1378 | dev_warn(&desc->gdev->dev, \ | |
1379 | "%s: backing chip is gone\n", __func__); \ | |
1380 | return; \ | |
1381 | } } while (0) | |
1382 | ||
1383 | ||
0eb4c6c2 | 1384 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1385 | { |
1386 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1387 | struct gpio_device *gdev; |
77c2d792 | 1388 | |
fdeb8e15 LW |
1389 | VALIDATE_DESC(desc); |
1390 | gdev = desc->gdev; | |
77c2d792 | 1391 | |
fdeb8e15 | 1392 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1393 | status = __gpiod_request(desc, label); |
1394 | if (status < 0) | |
fdeb8e15 | 1395 | module_put(gdev->owner); |
33a68e86 LW |
1396 | else |
1397 | get_device(&gdev->dev); | |
77c2d792 MW |
1398 | } |
1399 | ||
d2876d08 | 1400 | if (status) |
7589e59f | 1401 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 1402 | |
d2876d08 DB |
1403 | return status; |
1404 | } | |
372e722e | 1405 | |
77c2d792 | 1406 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 1407 | { |
77c2d792 | 1408 | bool ret = false; |
d2876d08 | 1409 | unsigned long flags; |
35e8bb51 | 1410 | struct gpio_chip *chip; |
d2876d08 | 1411 | |
3d599d1c UKK |
1412 | might_sleep(); |
1413 | ||
372e722e | 1414 | gpiod_unexport(desc); |
d8f388d8 | 1415 | |
d2876d08 DB |
1416 | spin_lock_irqsave(&gpio_lock, flags); |
1417 | ||
fdeb8e15 | 1418 | chip = desc->gdev->chip; |
35e8bb51 DB |
1419 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
1420 | if (chip->free) { | |
1421 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 1422 | might_sleep_if(chip->can_sleep); |
372e722e | 1423 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1424 | spin_lock_irqsave(&gpio_lock, flags); |
1425 | } | |
d2876d08 | 1426 | desc_set_label(desc, NULL); |
07697461 | 1427 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 1428 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 1429 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 1430 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 1431 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
1432 | ret = true; |
1433 | } | |
d2876d08 DB |
1434 | |
1435 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
1436 | return ret; |
1437 | } | |
1438 | ||
0eb4c6c2 | 1439 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 1440 | { |
33a68e86 | 1441 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 1442 | module_put(desc->gdev->owner); |
33a68e86 LW |
1443 | put_device(&desc->gdev->dev); |
1444 | } else { | |
77c2d792 | 1445 | WARN_ON(extra_checks); |
33a68e86 | 1446 | } |
d2876d08 | 1447 | } |
372e722e | 1448 | |
d2876d08 DB |
1449 | /** |
1450 | * gpiochip_is_requested - return string iff signal was requested | |
1451 | * @chip: controller managing the signal | |
1452 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1453 | * | |
1454 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
1455 | * The string returned is the label passed to gpio_request(); if none has been |
1456 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
1457 | * |
1458 | * This function is for use by GPIO controller drivers. The label can | |
1459 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1460 | * can help avoid accidentally multiplexing it to another controller. | |
1461 | */ | |
1462 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1463 | { | |
6c0b4e6c | 1464 | struct gpio_desc *desc; |
d2876d08 | 1465 | |
48b5953e | 1466 | if (offset >= chip->ngpio) |
d2876d08 | 1467 | return NULL; |
6c0b4e6c | 1468 | |
1c3cdb18 | 1469 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 1470 | |
372e722e | 1471 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1472 | return NULL; |
372e722e | 1473 | return desc->label; |
d2876d08 DB |
1474 | } |
1475 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1476 | ||
77c2d792 MW |
1477 | /** |
1478 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1479 | * @desc: GPIO descriptor to request | |
1480 | * @label: label for the GPIO | |
1481 | * | |
1482 | * Function allows GPIO chip drivers to request and use their own GPIO | |
1483 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
1484 | * function will not increase reference count of the GPIO chip module. This | |
1485 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
1486 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
1487 | */ | |
abdc08a3 AC |
1488 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
1489 | const char *label) | |
77c2d792 | 1490 | { |
abdc08a3 AC |
1491 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
1492 | int err; | |
77c2d792 | 1493 | |
abdc08a3 AC |
1494 | if (IS_ERR(desc)) { |
1495 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
1496 | return desc; | |
1497 | } | |
1498 | ||
1499 | err = __gpiod_request(desc, label); | |
1500 | if (err < 0) | |
1501 | return ERR_PTR(err); | |
77c2d792 | 1502 | |
abdc08a3 | 1503 | return desc; |
77c2d792 | 1504 | } |
f7d4ad98 | 1505 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
1506 | |
1507 | /** | |
1508 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
1509 | * @desc: GPIO descriptor to free | |
1510 | * | |
1511 | * Function frees the given GPIO requested previously with | |
1512 | * gpiochip_request_own_desc(). | |
1513 | */ | |
1514 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
1515 | { | |
1516 | if (desc) | |
1517 | __gpiod_free(desc); | |
1518 | } | |
f7d4ad98 | 1519 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 1520 | |
fdeb8e15 LW |
1521 | /* |
1522 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
1523 | * some cases this is done in early boot, before IRQs are enabled. |
1524 | * | |
1525 | * As a rule these aren't called more than once (except for drivers | |
1526 | * using the open-drain emulation idiom) so these are natural places | |
1527 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1528 | * rely on gpio_request() having been called beforehand. | |
1529 | */ | |
1530 | ||
79a9becd AC |
1531 | /** |
1532 | * gpiod_direction_input - set the GPIO direction to input | |
1533 | * @desc: GPIO to set to input | |
1534 | * | |
1535 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1536 | * be called safely on it. | |
1537 | * | |
1538 | * Return 0 in case of success, else an error code. | |
1539 | */ | |
1540 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 1541 | { |
d2876d08 | 1542 | struct gpio_chip *chip; |
d2876d08 DB |
1543 | int status = -EINVAL; |
1544 | ||
fdeb8e15 LW |
1545 | VALIDATE_DESC(desc); |
1546 | chip = desc->gdev->chip; | |
bcabdef1 | 1547 | |
be1a4b13 | 1548 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
1549 | gpiod_warn(desc, |
1550 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 1551 | __func__); |
be1a4b13 LW |
1552 | return -EIO; |
1553 | } | |
1554 | ||
d82da797 | 1555 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
1556 | if (status == 0) |
1557 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1558 | |
372e722e | 1559 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 1560 | |
d2876d08 DB |
1561 | return status; |
1562 | } | |
79a9becd | 1563 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1564 | |
ef70bbe1 | 1565 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 1566 | { |
c663e5f5 LW |
1567 | struct gpio_chip *gc = desc->gdev->chip; |
1568 | int ret; | |
d2876d08 | 1569 | |
d468bf9e LW |
1570 | /* GPIOs used for IRQs shall not be set as output */ |
1571 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1572 | gpiod_err(desc, | |
1573 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1574 | __func__); | |
1575 | return -EIO; | |
1576 | } | |
1577 | ||
c663e5f5 LW |
1578 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
1579 | /* First see if we can enable open drain in hardware */ | |
1580 | if (gc->set_single_ended) { | |
1581 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
1582 | LINE_MODE_OPEN_DRAIN); | |
1583 | if (!ret) | |
1584 | goto set_output_value; | |
1585 | } | |
1586 | /* Emulate open drain by not actively driving the line high */ | |
1587 | if (value) | |
1588 | return gpiod_direction_input(desc); | |
1589 | } | |
1590 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
1591 | if (gc->set_single_ended) { | |
1592 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
1593 | LINE_MODE_OPEN_SOURCE); | |
1594 | if (!ret) | |
1595 | goto set_output_value; | |
1596 | } | |
1597 | /* Emulate open source by not actively driving the line low */ | |
1598 | if (!value) | |
1599 | return gpiod_direction_input(desc); | |
1600 | } else { | |
1601 | /* Make sure to disable open drain/source hardware, if any */ | |
1602 | if (gc->set_single_ended) | |
1603 | gc->set_single_ended(gc, | |
1604 | gpio_chip_hwgpio(desc), | |
1605 | LINE_MODE_PUSH_PULL); | |
1606 | } | |
25553ff0 | 1607 | |
c663e5f5 LW |
1608 | set_output_value: |
1609 | if (!gc->set || !gc->direction_output) { | |
6424de5a MB |
1610 | gpiod_warn(desc, |
1611 | "%s: missing set() or direction_output() operations\n", | |
1612 | __func__); | |
be1a4b13 LW |
1613 | return -EIO; |
1614 | } | |
1615 | ||
c663e5f5 LW |
1616 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), value); |
1617 | if (!ret) | |
d2876d08 | 1618 | set_bit(FLAG_IS_OUT, &desc->flags); |
372e722e | 1619 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
c663e5f5 LW |
1620 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
1621 | return ret; | |
d2876d08 | 1622 | } |
ef70bbe1 PZ |
1623 | |
1624 | /** | |
1625 | * gpiod_direction_output_raw - set the GPIO direction to output | |
1626 | * @desc: GPIO to set to output | |
1627 | * @value: initial output value of the GPIO | |
1628 | * | |
1629 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1630 | * be called safely on it. The initial value of the output must be specified | |
1631 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
1632 | * | |
1633 | * Return 0 in case of success, else an error code. | |
1634 | */ | |
1635 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
1636 | { | |
fdeb8e15 | 1637 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1638 | return _gpiod_direction_output_raw(desc, value); |
1639 | } | |
1640 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
1641 | ||
1642 | /** | |
90df4fe0 | 1643 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
1644 | * @desc: GPIO to set to output |
1645 | * @value: initial output value of the GPIO | |
1646 | * | |
1647 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1648 | * be called safely on it. The initial value of the output must be specified | |
1649 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1650 | * account. | |
1651 | * | |
1652 | * Return 0 in case of success, else an error code. | |
1653 | */ | |
1654 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
1655 | { | |
fdeb8e15 | 1656 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1657 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1658 | value = !value; | |
1659 | return _gpiod_direction_output_raw(desc, value); | |
1660 | } | |
79a9becd | 1661 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1662 | |
c4b5be98 | 1663 | /** |
79a9becd | 1664 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1665 | * @gpio: the gpio to set debounce time |
1666 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1667 | * |
1668 | * returns -ENOTSUPP if the controller does not support setting | |
1669 | * debounce. | |
c4b5be98 | 1670 | */ |
79a9becd | 1671 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 1672 | { |
c4b5be98 | 1673 | struct gpio_chip *chip; |
c4b5be98 | 1674 | |
fdeb8e15 LW |
1675 | VALIDATE_DESC(desc); |
1676 | chip = desc->gdev->chip; | |
be1a4b13 | 1677 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1678 | gpiod_dbg(desc, |
1679 | "%s: missing set() or set_debounce() operations\n", | |
1680 | __func__); | |
65d87656 | 1681 | return -ENOTSUPP; |
be1a4b13 LW |
1682 | } |
1683 | ||
d82da797 | 1684 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 1685 | } |
79a9becd | 1686 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1687 | |
79a9becd AC |
1688 | /** |
1689 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1690 | * @desc: the gpio descriptor to test | |
1691 | * | |
1692 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1693 | */ | |
1694 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1695 | { |
fdeb8e15 | 1696 | VALIDATE_DESC(desc); |
79a9becd | 1697 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1698 | } |
79a9becd | 1699 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1700 | |
1701 | /* I/O calls are only valid after configuration completed; the relevant | |
1702 | * "is this a valid GPIO" error checks should already have been done. | |
1703 | * | |
1704 | * "Get" operations are often inlinable as reading a pin value register, | |
1705 | * and masking the relevant bit in that register. | |
1706 | * | |
1707 | * When "set" operations are inlinable, they involve writing that mask to | |
1708 | * one register to set a low value, or a different register to set it high. | |
1709 | * Otherwise locking is needed, so there may be little value to inlining. | |
1710 | * | |
1711 | *------------------------------------------------------------------------ | |
1712 | * | |
1713 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1714 | * have requested the GPIO. That can include implicit requesting by | |
1715 | * a direction setting call. Marking a gpio as requested locks its chip | |
1716 | * in memory, guaranteeing that these table lookups need no more locking | |
1717 | * and that gpiochip_remove() will fail. | |
1718 | * | |
1719 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1720 | * that the GPIO was actually requested. | |
1721 | */ | |
1722 | ||
e20538b8 | 1723 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
1724 | { |
1725 | struct gpio_chip *chip; | |
372e722e | 1726 | int offset; |
e20538b8 | 1727 | int value; |
d2876d08 | 1728 | |
fdeb8e15 | 1729 | chip = desc->gdev->chip; |
372e722e | 1730 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 1731 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 1732 | value = value < 0 ? value : !!value; |
372e722e | 1733 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 1734 | return value; |
d2876d08 | 1735 | } |
372e722e | 1736 | |
d2876d08 | 1737 | /** |
79a9becd AC |
1738 | * gpiod_get_raw_value() - return a gpio's raw value |
1739 | * @desc: gpio whose value will be returned | |
d2876d08 | 1740 | * |
79a9becd | 1741 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 1742 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1743 | * |
1744 | * This function should be called from contexts where we cannot sleep, and will | |
1745 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1746 | */ |
79a9becd | 1747 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1748 | { |
fdeb8e15 | 1749 | VALIDATE_DESC(desc); |
e4e449e8 | 1750 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1751 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1752 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1753 | } |
79a9becd | 1754 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1755 | |
79a9becd AC |
1756 | /** |
1757 | * gpiod_get_value() - return a gpio's value | |
1758 | * @desc: gpio whose value will be returned | |
1759 | * | |
1760 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1761 | * account, or negative errno on failure. |
79a9becd AC |
1762 | * |
1763 | * This function should be called from contexts where we cannot sleep, and will | |
1764 | * complain if the GPIO chip functions potentially sleep. | |
1765 | */ | |
1766 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1767 | { |
79a9becd | 1768 | int value; |
fdeb8e15 LW |
1769 | |
1770 | VALIDATE_DESC(desc); | |
79a9becd | 1771 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1772 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1773 | |
1774 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1775 | if (value < 0) |
1776 | return value; | |
1777 | ||
79a9becd AC |
1778 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1779 | value = !value; | |
1780 | ||
1781 | return value; | |
372e722e | 1782 | } |
79a9becd | 1783 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1784 | |
aca5ce14 LD |
1785 | /* |
1786 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1787 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 1788 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 1789 | */ |
23600969 | 1790 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
1791 | { |
1792 | int err = 0; | |
fdeb8e15 | 1793 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1794 | int offset = gpio_chip_hwgpio(desc); |
1795 | ||
aca5ce14 | 1796 | if (value) { |
372e722e | 1797 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1798 | if (!err) |
372e722e | 1799 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1800 | } else { |
372e722e | 1801 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1802 | if (!err) |
372e722e | 1803 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1804 | } |
372e722e | 1805 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1806 | if (err < 0) |
6424de5a MB |
1807 | gpiod_err(desc, |
1808 | "%s: Error in set_value for open drain err %d\n", | |
1809 | __func__, err); | |
aca5ce14 LD |
1810 | } |
1811 | ||
25553ff0 | 1812 | /* |
79a9becd AC |
1813 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1814 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 1815 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 1816 | */ |
23600969 | 1817 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
1818 | { |
1819 | int err = 0; | |
fdeb8e15 | 1820 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1821 | int offset = gpio_chip_hwgpio(desc); |
1822 | ||
25553ff0 | 1823 | if (value) { |
372e722e | 1824 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1825 | if (!err) |
372e722e | 1826 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1827 | } else { |
372e722e | 1828 | err = chip->direction_input(chip, offset); |
25553ff0 | 1829 | if (!err) |
372e722e | 1830 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1831 | } |
372e722e | 1832 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1833 | if (err < 0) |
6424de5a MB |
1834 | gpiod_err(desc, |
1835 | "%s: Error in set_value for open source err %d\n", | |
1836 | __func__, err); | |
25553ff0 LD |
1837 | } |
1838 | ||
23600969 | 1839 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
1840 | { |
1841 | struct gpio_chip *chip; | |
1842 | ||
fdeb8e15 | 1843 | chip = desc->gdev->chip; |
372e722e AC |
1844 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1845 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1846 | _gpio_set_open_drain_value(desc, value); | |
1847 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1848 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 1849 | else |
372e722e AC |
1850 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
1851 | } | |
1852 | ||
5f424243 RI |
1853 | /* |
1854 | * set multiple outputs on the same chip; | |
1855 | * use the chip's set_multiple function if available; | |
1856 | * otherwise set the outputs sequentially; | |
1857 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
1858 | * defines which outputs are to be changed | |
1859 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
1860 | * defines the values the outputs specified by mask are to be set to | |
1861 | */ | |
1862 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
1863 | unsigned long *mask, unsigned long *bits) | |
1864 | { | |
1865 | if (chip->set_multiple) { | |
1866 | chip->set_multiple(chip, mask, bits); | |
1867 | } else { | |
1868 | int i; | |
1869 | for (i = 0; i < chip->ngpio; i++) { | |
1870 | if (mask[BIT_WORD(i)] == 0) { | |
1871 | /* no more set bits in this mask word; | |
1872 | * skip ahead to the next word */ | |
1873 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
1874 | continue; | |
1875 | } | |
1876 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 1877 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 1878 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
1879 | } |
1880 | } | |
1881 | } | |
1882 | ||
44c7288f LW |
1883 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
1884 | unsigned int array_size, | |
1885 | struct gpio_desc **desc_array, | |
1886 | int *value_array) | |
5f424243 RI |
1887 | { |
1888 | int i = 0; | |
1889 | ||
1890 | while (i < array_size) { | |
fdeb8e15 | 1891 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
1892 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
1893 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
1894 | int count = 0; | |
1895 | ||
38e003f4 | 1896 | if (!can_sleep) |
5f424243 | 1897 | WARN_ON(chip->can_sleep); |
38e003f4 | 1898 | |
5f424243 RI |
1899 | memset(mask, 0, sizeof(mask)); |
1900 | do { | |
1901 | struct gpio_desc *desc = desc_array[i]; | |
1902 | int hwgpio = gpio_chip_hwgpio(desc); | |
1903 | int value = value_array[i]; | |
1904 | ||
1905 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1906 | value = !value; | |
1907 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1908 | /* | |
1909 | * collect all normal outputs belonging to the same chip | |
1910 | * open drain and open source outputs are set individually | |
1911 | */ | |
1912 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 1913 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
1914 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
1915 | _gpio_set_open_source_value(desc, value); | |
1916 | } else { | |
1917 | __set_bit(hwgpio, mask); | |
38e003f4 | 1918 | if (value) |
5f424243 | 1919 | __set_bit(hwgpio, bits); |
38e003f4 | 1920 | else |
5f424243 | 1921 | __clear_bit(hwgpio, bits); |
5f424243 RI |
1922 | count++; |
1923 | } | |
1924 | i++; | |
fdeb8e15 LW |
1925 | } while ((i < array_size) && |
1926 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 1927 | /* push collected bits to outputs */ |
38e003f4 | 1928 | if (count != 0) |
5f424243 | 1929 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
1930 | } |
1931 | } | |
1932 | ||
d2876d08 | 1933 | /** |
79a9becd AC |
1934 | * gpiod_set_raw_value() - assign a gpio's raw value |
1935 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1936 | * @value: value to assign |
d2876d08 | 1937 | * |
79a9becd AC |
1938 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1939 | * regard for its ACTIVE_LOW status. | |
1940 | * | |
1941 | * This function should be called from contexts where we cannot sleep, and will | |
1942 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1943 | */ |
79a9becd | 1944 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 1945 | { |
fdeb8e15 | 1946 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 1947 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 1948 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1949 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 1950 | } |
79a9becd | 1951 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
1952 | |
1953 | /** | |
79a9becd AC |
1954 | * gpiod_set_value() - assign a gpio's value |
1955 | * @desc: gpio whose value will be assigned | |
1956 | * @value: value to assign | |
1957 | * | |
1958 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1959 | * account | |
d2876d08 | 1960 | * |
79a9becd AC |
1961 | * This function should be called from contexts where we cannot sleep, and will |
1962 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1963 | */ |
79a9becd | 1964 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 1965 | { |
fdeb8e15 | 1966 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 1967 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 1968 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1969 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1970 | value = !value; | |
1971 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1972 | } |
79a9becd | 1973 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 1974 | |
5f424243 | 1975 | /** |
3fff99bc | 1976 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1977 | * @array_size: number of elements in the descriptor / value arrays |
1978 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1979 | * @value_array: array of values to assign | |
1980 | * | |
1981 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1982 | * without regard for their ACTIVE_LOW status. | |
1983 | * | |
1984 | * This function should be called from contexts where we cannot sleep, and will | |
1985 | * complain if the GPIO chip functions potentially sleep. | |
1986 | */ | |
3fff99bc | 1987 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
1988 | struct gpio_desc **desc_array, int *value_array) |
1989 | { | |
1990 | if (!desc_array) | |
1991 | return; | |
44c7288f LW |
1992 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
1993 | value_array); | |
5f424243 | 1994 | } |
3fff99bc | 1995 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
1996 | |
1997 | /** | |
3fff99bc | 1998 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1999 | * @array_size: number of elements in the descriptor / value arrays |
2000 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2001 | * @value_array: array of values to assign | |
2002 | * | |
2003 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2004 | * into account. | |
2005 | * | |
2006 | * This function should be called from contexts where we cannot sleep, and will | |
2007 | * complain if the GPIO chip functions potentially sleep. | |
2008 | */ | |
3fff99bc RI |
2009 | void gpiod_set_array_value(unsigned int array_size, |
2010 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2011 | { |
2012 | if (!desc_array) | |
2013 | return; | |
44c7288f LW |
2014 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2015 | value_array); | |
5f424243 | 2016 | } |
3fff99bc | 2017 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2018 | |
d2876d08 | 2019 | /** |
79a9becd AC |
2020 | * gpiod_cansleep() - report whether gpio value access may sleep |
2021 | * @desc: gpio to check | |
d2876d08 | 2022 | * |
d2876d08 | 2023 | */ |
79a9becd | 2024 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2025 | { |
fdeb8e15 LW |
2026 | VALIDATE_DESC(desc); |
2027 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2028 | } |
79a9becd | 2029 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2030 | |
0f6d504e | 2031 | /** |
79a9becd AC |
2032 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2033 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2034 | * |
79a9becd AC |
2035 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2036 | * error. | |
0f6d504e | 2037 | */ |
79a9becd | 2038 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2039 | { |
4c37ce86 LW |
2040 | struct gpio_chip *chip; |
2041 | int offset; | |
0f6d504e | 2042 | |
fdeb8e15 LW |
2043 | VALIDATE_DESC(desc); |
2044 | chip = desc->gdev->chip; | |
372e722e | 2045 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
2046 | if (chip->to_irq) { |
2047 | int retirq = chip->to_irq(chip, offset); | |
2048 | ||
2049 | /* Zero means NO_IRQ */ | |
2050 | if (!retirq) | |
2051 | return -ENXIO; | |
2052 | ||
2053 | return retirq; | |
2054 | } | |
2055 | return -ENXIO; | |
0f6d504e | 2056 | } |
79a9becd | 2057 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 2058 | |
d468bf9e | 2059 | /** |
e3a2e878 | 2060 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
2061 | * @chip: the chip the GPIO to lock belongs to |
2062 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2063 | * |
2064 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 2065 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 2066 | */ |
e3a2e878 | 2067 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 2068 | { |
d74be6df | 2069 | if (offset >= chip->ngpio) |
d468bf9e LW |
2070 | return -EINVAL; |
2071 | ||
1c3cdb18 | 2072 | if (test_bit(FLAG_IS_OUT, &chip->gpiodev->descs[offset].flags)) { |
d74be6df | 2073 | chip_err(chip, |
d468bf9e LW |
2074 | "%s: tried to flag a GPIO set as output for IRQ\n", |
2075 | __func__); | |
2076 | return -EIO; | |
2077 | } | |
2078 | ||
1c3cdb18 | 2079 | set_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 2080 | return 0; |
372e722e | 2081 | } |
e3a2e878 | 2082 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 2083 | |
d468bf9e | 2084 | /** |
e3a2e878 | 2085 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
2086 | * @chip: the chip the GPIO to lock belongs to |
2087 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2088 | * |
2089 | * This is used directly by GPIO drivers that want to indicate | |
2090 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 2091 | */ |
e3a2e878 | 2092 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 2093 | { |
d74be6df | 2094 | if (offset >= chip->ngpio) |
d468bf9e | 2095 | return; |
d2876d08 | 2096 | |
1c3cdb18 | 2097 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 2098 | } |
e3a2e878 | 2099 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 2100 | |
6cee3821 LW |
2101 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
2102 | { | |
2103 | if (offset >= chip->ngpio) | |
2104 | return false; | |
2105 | ||
2106 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
2107 | } | |
2108 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
2109 | ||
143b65d6 LW |
2110 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
2111 | { | |
2112 | if (offset >= chip->ngpio) | |
2113 | return false; | |
2114 | ||
2115 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
2116 | } | |
2117 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
2118 | ||
2119 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
2120 | { | |
2121 | if (offset >= chip->ngpio) | |
2122 | return false; | |
2123 | ||
2124 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
2125 | } | |
2126 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
2127 | ||
79a9becd AC |
2128 | /** |
2129 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2130 | * @desc: gpio whose value will be returned | |
2131 | * | |
2132 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 2133 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2134 | * |
2135 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2136 | */ |
79a9becd | 2137 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2138 | { |
d2876d08 | 2139 | might_sleep_if(extra_checks); |
fdeb8e15 | 2140 | VALIDATE_DESC(desc); |
79a9becd | 2141 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2142 | } |
79a9becd | 2143 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2144 | |
79a9becd AC |
2145 | /** |
2146 | * gpiod_get_value_cansleep() - return a gpio's value | |
2147 | * @desc: gpio whose value will be returned | |
2148 | * | |
2149 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2150 | * account, or negative errno on failure. |
79a9becd AC |
2151 | * |
2152 | * This function is to be called from contexts that can sleep. | |
2153 | */ | |
2154 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2155 | { |
3f397c21 | 2156 | int value; |
d2876d08 DB |
2157 | |
2158 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2159 | VALIDATE_DESC(desc); |
79a9becd | 2160 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
2161 | if (value < 0) |
2162 | return value; | |
2163 | ||
79a9becd AC |
2164 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2165 | value = !value; | |
2166 | ||
3f397c21 | 2167 | return value; |
d2876d08 | 2168 | } |
79a9becd | 2169 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2170 | |
79a9becd AC |
2171 | /** |
2172 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2173 | * @desc: gpio whose value will be assigned | |
2174 | * @value: value to assign | |
2175 | * | |
2176 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2177 | * regard for its ACTIVE_LOW status. | |
2178 | * | |
2179 | * This function is to be called from contexts that can sleep. | |
2180 | */ | |
2181 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2182 | { |
d2876d08 | 2183 | might_sleep_if(extra_checks); |
fdeb8e15 | 2184 | VALIDATE_DESC_VOID(desc); |
79a9becd | 2185 | _gpiod_set_raw_value(desc, value); |
372e722e | 2186 | } |
79a9becd | 2187 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2188 | |
79a9becd AC |
2189 | /** |
2190 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2191 | * @desc: gpio whose value will be assigned | |
2192 | * @value: value to assign | |
2193 | * | |
2194 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2195 | * account | |
2196 | * | |
2197 | * This function is to be called from contexts that can sleep. | |
2198 | */ | |
2199 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2200 | { |
d2876d08 | 2201 | might_sleep_if(extra_checks); |
fdeb8e15 | 2202 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2203 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2204 | value = !value; | |
2205 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2206 | } |
79a9becd | 2207 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2208 | |
5f424243 | 2209 | /** |
3fff99bc | 2210 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2211 | * @array_size: number of elements in the descriptor / value arrays |
2212 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2213 | * @value_array: array of values to assign | |
2214 | * | |
2215 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2216 | * without regard for their ACTIVE_LOW status. | |
2217 | * | |
2218 | * This function is to be called from contexts that can sleep. | |
2219 | */ | |
3fff99bc RI |
2220 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2221 | struct gpio_desc **desc_array, | |
2222 | int *value_array) | |
5f424243 RI |
2223 | { |
2224 | might_sleep_if(extra_checks); | |
2225 | if (!desc_array) | |
2226 | return; | |
44c7288f LW |
2227 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
2228 | value_array); | |
5f424243 | 2229 | } |
3fff99bc | 2230 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2231 | |
2232 | /** | |
3fff99bc | 2233 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2234 | * @array_size: number of elements in the descriptor / value arrays |
2235 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2236 | * @value_array: array of values to assign | |
2237 | * | |
2238 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2239 | * into account. | |
2240 | * | |
2241 | * This function is to be called from contexts that can sleep. | |
2242 | */ | |
3fff99bc RI |
2243 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2244 | struct gpio_desc **desc_array, | |
2245 | int *value_array) | |
5f424243 RI |
2246 | { |
2247 | might_sleep_if(extra_checks); | |
2248 | if (!desc_array) | |
2249 | return; | |
44c7288f LW |
2250 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
2251 | value_array); | |
5f424243 | 2252 | } |
3fff99bc | 2253 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2254 | |
bae48da2 | 2255 | /** |
ad824783 AC |
2256 | * gpiod_add_lookup_table() - register GPIO device consumers |
2257 | * @table: table of consumers to register | |
bae48da2 | 2258 | */ |
ad824783 | 2259 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2260 | { |
2261 | mutex_lock(&gpio_lookup_lock); | |
2262 | ||
ad824783 | 2263 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2264 | |
2265 | mutex_unlock(&gpio_lookup_lock); | |
2266 | } | |
2267 | ||
be9015ab SK |
2268 | /** |
2269 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2270 | * @table: table of consumers to unregister | |
2271 | */ | |
2272 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2273 | { | |
2274 | mutex_lock(&gpio_lookup_lock); | |
2275 | ||
2276 | list_del(&table->list); | |
2277 | ||
2278 | mutex_unlock(&gpio_lookup_lock); | |
2279 | } | |
2280 | ||
bae48da2 | 2281 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2282 | unsigned int idx, |
2283 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
2284 | { |
2285 | char prop_name[32]; /* 32 is max size of property name */ | |
2286 | enum of_gpio_flags of_flags; | |
2287 | struct gpio_desc *desc; | |
dd34c37a | 2288 | unsigned int i; |
bae48da2 | 2289 | |
7f2e553a | 2290 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 2291 | if (con_id) |
9e089246 | 2292 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 2293 | gpio_suffixes[i]); |
dd34c37a | 2294 | else |
9e089246 | 2295 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 2296 | gpio_suffixes[i]); |
bae48da2 | 2297 | |
dd34c37a TR |
2298 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
2299 | &of_flags); | |
06fc3b70 | 2300 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) |
dd34c37a TR |
2301 | break; |
2302 | } | |
bae48da2 AC |
2303 | |
2304 | if (IS_ERR(desc)) | |
2305 | return desc; | |
2306 | ||
2307 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 2308 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 | 2309 | |
90b665f6 LP |
2310 | if (of_flags & OF_GPIO_SINGLE_ENDED) { |
2311 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
2312 | *flags |= GPIO_OPEN_DRAIN; | |
2313 | else | |
2314 | *flags |= GPIO_OPEN_SOURCE; | |
2315 | } | |
2316 | ||
bae48da2 AC |
2317 | return desc; |
2318 | } | |
d2876d08 | 2319 | |
25487533 DT |
2320 | static struct gpio_desc *acpi_find_gpio(struct device *dev, |
2321 | const char *con_id, | |
53e7cac3 | 2322 | unsigned int idx, |
25487533 DT |
2323 | enum gpiod_flags flags, |
2324 | enum gpio_lookup_flags *lookupflags) | |
372e722e | 2325 | { |
0d9a693c | 2326 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
2327 | struct acpi_gpio_info info; |
2328 | struct gpio_desc *desc; | |
0d9a693c MW |
2329 | char propname[32]; |
2330 | int i; | |
e01f440a | 2331 | |
0d9a693c | 2332 | /* Try first from _DSD */ |
7f2e553a | 2333 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
2334 | if (con_id && strcmp(con_id, "gpios")) { |
2335 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 2336 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
2337 | } else { |
2338 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 2339 | gpio_suffixes[i]); |
0d9a693c MW |
2340 | } |
2341 | ||
2342 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
2343 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
2344 | break; | |
2345 | } | |
2346 | ||
2347 | /* Then from plain _CRS GPIOs */ | |
2348 | if (IS_ERR(desc)) { | |
10cf4899 DT |
2349 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
2350 | return ERR_PTR(-ENOENT); | |
2351 | ||
0d9a693c MW |
2352 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); |
2353 | if (IS_ERR(desc)) | |
2354 | return desc; | |
25487533 DT |
2355 | |
2356 | if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) && | |
2357 | info.gpioint) { | |
2358 | dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); | |
2359 | return ERR_PTR(-ENOENT); | |
2360 | } | |
0d9a693c | 2361 | } |
e01f440a | 2362 | |
52044723 | 2363 | if (info.polarity == GPIO_ACTIVE_LOW) |
25487533 | 2364 | *lookupflags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
2365 | |
2366 | return desc; | |
81f59e9d MW |
2367 | } |
2368 | ||
ad824783 | 2369 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2370 | { |
2371 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2372 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2373 | |
2374 | mutex_lock(&gpio_lookup_lock); | |
2375 | ||
ad824783 AC |
2376 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2377 | if (table->dev_id && dev_id) { | |
2378 | /* | |
2379 | * Valid strings on both ends, must be identical to have | |
2380 | * a match | |
2381 | */ | |
2382 | if (!strcmp(table->dev_id, dev_id)) | |
2383 | goto found; | |
2384 | } else { | |
2385 | /* | |
2386 | * One of the pointers is NULL, so both must be to have | |
2387 | * a match | |
2388 | */ | |
2389 | if (dev_id == table->dev_id) | |
2390 | goto found; | |
2391 | } | |
2392 | } | |
2393 | table = NULL; | |
bae48da2 | 2394 | |
ad824783 AC |
2395 | found: |
2396 | mutex_unlock(&gpio_lookup_lock); | |
2397 | return table; | |
2398 | } | |
bae48da2 | 2399 | |
ad824783 AC |
2400 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2401 | unsigned int idx, | |
2402 | enum gpio_lookup_flags *flags) | |
2403 | { | |
2a3cf6a3 | 2404 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2405 | struct gpiod_lookup_table *table; |
2406 | struct gpiod_lookup *p; | |
bae48da2 | 2407 | |
ad824783 AC |
2408 | table = gpiod_find_lookup_table(dev); |
2409 | if (!table) | |
2410 | return desc; | |
bae48da2 | 2411 | |
ad824783 AC |
2412 | for (p = &table->table[0]; p->chip_label; p++) { |
2413 | struct gpio_chip *chip; | |
bae48da2 | 2414 | |
ad824783 | 2415 | /* idx must always match exactly */ |
bae48da2 AC |
2416 | if (p->idx != idx) |
2417 | continue; | |
2418 | ||
ad824783 AC |
2419 | /* If the lookup entry has a con_id, require exact match */ |
2420 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2421 | continue; | |
bae48da2 | 2422 | |
ad824783 | 2423 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2424 | |
ad824783 | 2425 | if (!chip) { |
2a3cf6a3 AC |
2426 | dev_err(dev, "cannot find GPIO chip %s\n", |
2427 | p->chip_label); | |
2428 | return ERR_PTR(-ENODEV); | |
ad824783 | 2429 | } |
bae48da2 | 2430 | |
ad824783 | 2431 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2432 | dev_err(dev, |
2433 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2434 | idx, chip->ngpio, chip->label); | |
2435 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2436 | } |
bae48da2 | 2437 | |
bb1e88cc | 2438 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2439 | *flags = p->flags; |
bae48da2 | 2440 | |
2a3cf6a3 | 2441 | return desc; |
bae48da2 AC |
2442 | } |
2443 | ||
bae48da2 AC |
2444 | return desc; |
2445 | } | |
2446 | ||
66858527 RI |
2447 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2448 | { | |
2449 | int ret; | |
2450 | char propname[32]; | |
2451 | unsigned int i; | |
2452 | ||
2453 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2454 | if (con_id) | |
2455 | snprintf(propname, sizeof(propname), "%s-%s", | |
2456 | con_id, gpio_suffixes[i]); | |
2457 | else | |
2458 | snprintf(propname, sizeof(propname), "%s", | |
2459 | gpio_suffixes[i]); | |
2460 | ||
2461 | ret = of_gpio_named_count(dev->of_node, propname); | |
2462 | if (ret >= 0) | |
2463 | break; | |
2464 | } | |
2465 | return ret; | |
2466 | } | |
2467 | ||
2468 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
2469 | { | |
2470 | struct gpiod_lookup_table *table; | |
2471 | struct gpiod_lookup *p; | |
2472 | unsigned int count = 0; | |
2473 | ||
2474 | table = gpiod_find_lookup_table(dev); | |
2475 | if (!table) | |
2476 | return -ENOENT; | |
2477 | ||
2478 | for (p = &table->table[0]; p->chip_label; p++) { | |
2479 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
2480 | (!con_id && !p->con_id)) | |
2481 | count++; | |
2482 | } | |
2483 | if (!count) | |
2484 | return -ENOENT; | |
2485 | ||
2486 | return count; | |
2487 | } | |
2488 | ||
2489 | /** | |
2490 | * gpiod_count - return the number of GPIOs associated with a device / function | |
2491 | * or -ENOENT if no GPIO has been assigned to the requested function | |
2492 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2493 | * @con_id: function within the GPIO consumer | |
2494 | */ | |
2495 | int gpiod_count(struct device *dev, const char *con_id) | |
2496 | { | |
2497 | int count = -ENOENT; | |
2498 | ||
2499 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
2500 | count = dt_gpio_count(dev, con_id); | |
2501 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
2502 | count = acpi_gpio_count(dev, con_id); | |
2503 | ||
2504 | if (count < 0) | |
2505 | count = platform_gpio_count(dev, con_id); | |
2506 | ||
2507 | return count; | |
2508 | } | |
2509 | EXPORT_SYMBOL_GPL(gpiod_count); | |
2510 | ||
bae48da2 | 2511 | /** |
0879162f | 2512 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 2513 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 2514 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 2515 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2516 | * |
2517 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 2518 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 2519 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 2520 | */ |
b17d1bf1 | 2521 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 2522 | enum gpiod_flags flags) |
bae48da2 | 2523 | { |
39b2bbe3 | 2524 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 2525 | } |
b17d1bf1 | 2526 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 2527 | |
29a1f233 TR |
2528 | /** |
2529 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
2530 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2531 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 2532 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2533 | * |
2534 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
2535 | * the requested function it will return NULL. This is convenient for drivers | |
2536 | * that need to handle optional GPIOs. | |
2537 | */ | |
b17d1bf1 | 2538 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
2539 | const char *con_id, |
2540 | enum gpiod_flags flags) | |
29a1f233 | 2541 | { |
39b2bbe3 | 2542 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 2543 | } |
b17d1bf1 | 2544 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 2545 | |
923b93e4 LP |
2546 | /** |
2547 | * gpiod_parse_flags - helper function to parse GPIO lookup flags | |
2548 | * @desc: gpio to be setup | |
2549 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2550 | * of_get_gpio_hog() | |
2551 | * | |
2552 | * Set the GPIO descriptor flags based on the given GPIO lookup flags. | |
2553 | */ | |
2554 | static void gpiod_parse_flags(struct gpio_desc *desc, unsigned long lflags) | |
2555 | { | |
2556 | if (lflags & GPIO_ACTIVE_LOW) | |
2557 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2558 | if (lflags & GPIO_OPEN_DRAIN) | |
2559 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2560 | if (lflags & GPIO_OPEN_SOURCE) | |
2561 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2562 | } | |
f625d460 BP |
2563 | |
2564 | /** | |
2565 | * gpiod_configure_flags - helper function to configure a given GPIO | |
2566 | * @desc: gpio whose value will be assigned | |
2567 | * @con_id: function within the GPIO consumer | |
f625d460 BP |
2568 | * @dflags: gpiod_flags - optional GPIO initialization flags |
2569 | * | |
2570 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
2571 | * requested function and/or index, or another IS_ERR() code if an error | |
2572 | * occurred while trying to acquire the GPIO. | |
2573 | */ | |
2574 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
923b93e4 | 2575 | enum gpiod_flags dflags) |
f625d460 BP |
2576 | { |
2577 | int status; | |
2578 | ||
f625d460 BP |
2579 | /* No particular flag request, return here... */ |
2580 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
2581 | pr_debug("no flags found for %s\n", con_id); | |
2582 | return 0; | |
2583 | } | |
2584 | ||
2585 | /* Process flags */ | |
2586 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
2587 | status = gpiod_direction_output(desc, | |
2588 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
2589 | else | |
2590 | status = gpiod_direction_input(desc); | |
2591 | ||
2592 | return status; | |
2593 | } | |
2594 | ||
bae48da2 AC |
2595 | /** |
2596 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 2597 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
2598 | * @con_id: function within the GPIO consumer |
2599 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2600 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2601 | * |
2602 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2603 | * defined one for functions that define several GPIOs. | |
2604 | * | |
2a3cf6a3 AC |
2605 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
2606 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 2607 | * occurred while trying to acquire the GPIO. |
bae48da2 | 2608 | */ |
b17d1bf1 | 2609 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 2610 | const char *con_id, |
39b2bbe3 AC |
2611 | unsigned int idx, |
2612 | enum gpiod_flags flags) | |
bae48da2 | 2613 | { |
35c5d7fd | 2614 | struct gpio_desc *desc = NULL; |
bae48da2 | 2615 | int status; |
39b2bbe3 | 2616 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
2617 | |
2618 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2619 | ||
4d8440b9 RW |
2620 | if (dev) { |
2621 | /* Using device tree? */ | |
2622 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
2623 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2624 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
2625 | } else if (ACPI_COMPANION(dev)) { | |
2626 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
25487533 | 2627 | desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); |
4d8440b9 | 2628 | } |
35c5d7fd AC |
2629 | } |
2630 | ||
2631 | /* | |
2632 | * Either we are not using DT or ACPI, or their lookup did not return | |
2633 | * a result. In that case, use platform lookup as a fallback. | |
2634 | */ | |
2a3cf6a3 | 2635 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 2636 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 2637 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
2638 | } |
2639 | ||
2640 | if (IS_ERR(desc)) { | |
351cfe0f | 2641 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
2642 | return desc; |
2643 | } | |
2644 | ||
923b93e4 LP |
2645 | gpiod_parse_flags(desc, lookupflags); |
2646 | ||
bae48da2 | 2647 | status = gpiod_request(desc, con_id); |
bae48da2 AC |
2648 | if (status < 0) |
2649 | return ERR_PTR(status); | |
2650 | ||
923b93e4 | 2651 | status = gpiod_configure_flags(desc, con_id, flags); |
39b2bbe3 AC |
2652 | if (status < 0) { |
2653 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
2654 | gpiod_put(desc); | |
2655 | return ERR_PTR(status); | |
2656 | } | |
2657 | ||
bae48da2 AC |
2658 | return desc; |
2659 | } | |
b17d1bf1 | 2660 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 2661 | |
40b73183 MW |
2662 | /** |
2663 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
2664 | * @fwnode: handle of the firmware node | |
2665 | * @propname: name of the firmware property representing the GPIO | |
2666 | * | |
2667 | * This function can be used for drivers that get their configuration | |
2668 | * from firmware. | |
2669 | * | |
2670 | * Function properly finds the corresponding GPIO using whatever is the | |
2671 | * underlying firmware interface and then makes sure that the GPIO | |
2672 | * descriptor is requested before it is returned to the caller. | |
2673 | * | |
2674 | * In case of error an ERR_PTR() is returned. | |
2675 | */ | |
2676 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
2677 | const char *propname) | |
2678 | { | |
2679 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2680 | bool active_low = false; | |
90b665f6 | 2681 | bool single_ended = false; |
40b73183 MW |
2682 | int ret; |
2683 | ||
2684 | if (!fwnode) | |
2685 | return ERR_PTR(-EINVAL); | |
2686 | ||
2687 | if (is_of_node(fwnode)) { | |
2688 | enum of_gpio_flags flags; | |
2689 | ||
c181fb3e | 2690 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 2691 | &flags); |
90b665f6 | 2692 | if (!IS_ERR(desc)) { |
40b73183 | 2693 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
2694 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
2695 | } | |
40b73183 MW |
2696 | } else if (is_acpi_node(fwnode)) { |
2697 | struct acpi_gpio_info info; | |
2698 | ||
504a3374 | 2699 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 2700 | if (!IS_ERR(desc)) |
52044723 | 2701 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
2702 | } |
2703 | ||
2704 | if (IS_ERR(desc)) | |
2705 | return desc; | |
2706 | ||
40b73183 MW |
2707 | if (active_low) |
2708 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2709 | ||
90b665f6 LP |
2710 | if (single_ended) { |
2711 | if (active_low) | |
2712 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2713 | else | |
2714 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2715 | } | |
2716 | ||
923b93e4 LP |
2717 | ret = gpiod_request(desc, NULL); |
2718 | if (ret) | |
2719 | return ERR_PTR(ret); | |
2720 | ||
40b73183 MW |
2721 | return desc; |
2722 | } | |
2723 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
2724 | ||
29a1f233 TR |
2725 | /** |
2726 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
2727 | * function | |
2728 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2729 | * @con_id: function within the GPIO consumer | |
2730 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2731 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2732 | * |
2733 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
2734 | * specified index was assigned to the requested function it will return NULL. | |
2735 | * This is convenient for drivers that need to handle optional GPIOs. | |
2736 | */ | |
b17d1bf1 | 2737 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 2738 | const char *con_id, |
39b2bbe3 AC |
2739 | unsigned int index, |
2740 | enum gpiod_flags flags) | |
29a1f233 TR |
2741 | { |
2742 | struct gpio_desc *desc; | |
2743 | ||
39b2bbe3 | 2744 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
2745 | if (IS_ERR(desc)) { |
2746 | if (PTR_ERR(desc) == -ENOENT) | |
2747 | return NULL; | |
2748 | } | |
2749 | ||
2750 | return desc; | |
2751 | } | |
b17d1bf1 | 2752 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 2753 | |
f625d460 BP |
2754 | /** |
2755 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
2756 | * @desc: gpio whose value will be assigned | |
2757 | * @name: gpio line name | |
2758 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2759 | * of_get_gpio_hog() | |
2760 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2761 | */ | |
2762 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
2763 | unsigned long lflags, enum gpiod_flags dflags) | |
2764 | { | |
2765 | struct gpio_chip *chip; | |
2766 | struct gpio_desc *local_desc; | |
2767 | int hwnum; | |
2768 | int status; | |
2769 | ||
2770 | chip = gpiod_to_chip(desc); | |
2771 | hwnum = gpio_chip_hwgpio(desc); | |
2772 | ||
923b93e4 LP |
2773 | gpiod_parse_flags(desc, lflags); |
2774 | ||
f625d460 BP |
2775 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); |
2776 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
2777 | status = PTR_ERR(local_desc); |
2778 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
2779 | name, chip->label, hwnum, status); | |
2780 | return status; | |
f625d460 BP |
2781 | } |
2782 | ||
923b93e4 | 2783 | status = gpiod_configure_flags(desc, name, dflags); |
f625d460 | 2784 | if (status < 0) { |
c31a571d LD |
2785 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
2786 | name, chip->label, hwnum, status); | |
f625d460 BP |
2787 | gpiochip_free_own_desc(desc); |
2788 | return status; | |
2789 | } | |
2790 | ||
2791 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
2792 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
2793 | ||
2794 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
2795 | desc_to_gpio(desc), name, | |
2796 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
2797 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
2798 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
2799 | ||
2800 | return 0; | |
2801 | } | |
2802 | ||
2803 | /** | |
2804 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
2805 | * @chip: gpio chip to act on | |
2806 | * | |
2807 | * This is only used by of_gpiochip_remove to free hogged gpios | |
2808 | */ | |
2809 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
2810 | { | |
2811 | int id; | |
2812 | ||
2813 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
2814 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
2815 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
2816 | } |
2817 | } | |
2818 | ||
66858527 RI |
2819 | /** |
2820 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
2821 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2822 | * @con_id: function within the GPIO consumer | |
2823 | * @flags: optional GPIO initialization flags | |
2824 | * | |
2825 | * This function acquires all the GPIOs defined under a given function. | |
2826 | * | |
2827 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
2828 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
2829 | * code if an error occurred while trying to acquire the GPIOs. | |
2830 | */ | |
2831 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
2832 | const char *con_id, | |
2833 | enum gpiod_flags flags) | |
2834 | { | |
2835 | struct gpio_desc *desc; | |
2836 | struct gpio_descs *descs; | |
2837 | int count; | |
2838 | ||
2839 | count = gpiod_count(dev, con_id); | |
2840 | if (count < 0) | |
2841 | return ERR_PTR(count); | |
2842 | ||
2843 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
2844 | GFP_KERNEL); | |
2845 | if (!descs) | |
2846 | return ERR_PTR(-ENOMEM); | |
2847 | ||
2848 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
2849 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
2850 | if (IS_ERR(desc)) { | |
2851 | gpiod_put_array(descs); | |
2852 | return ERR_CAST(desc); | |
2853 | } | |
2854 | descs->desc[descs->ndescs] = desc; | |
2855 | descs->ndescs++; | |
2856 | } | |
2857 | return descs; | |
2858 | } | |
2859 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
2860 | ||
2861 | /** | |
2862 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
2863 | * function | |
2864 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2865 | * @con_id: function within the GPIO consumer | |
2866 | * @flags: optional GPIO initialization flags | |
2867 | * | |
2868 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
2869 | * assigned to the requested function it will return NULL. | |
2870 | */ | |
2871 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
2872 | const char *con_id, | |
2873 | enum gpiod_flags flags) | |
2874 | { | |
2875 | struct gpio_descs *descs; | |
2876 | ||
2877 | descs = gpiod_get_array(dev, con_id, flags); | |
2878 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
2879 | return NULL; | |
2880 | ||
2881 | return descs; | |
2882 | } | |
2883 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
2884 | ||
bae48da2 AC |
2885 | /** |
2886 | * gpiod_put - dispose of a GPIO descriptor | |
2887 | * @desc: GPIO descriptor to dispose of | |
2888 | * | |
2889 | * No descriptor can be used after gpiod_put() has been called on it. | |
2890 | */ | |
2891 | void gpiod_put(struct gpio_desc *desc) | |
2892 | { | |
2893 | gpiod_free(desc); | |
372e722e | 2894 | } |
bae48da2 | 2895 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 2896 | |
66858527 RI |
2897 | /** |
2898 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
2899 | * @descs: struct gpio_descs containing an array of descriptors | |
2900 | */ | |
2901 | void gpiod_put_array(struct gpio_descs *descs) | |
2902 | { | |
2903 | unsigned int i; | |
2904 | ||
2905 | for (i = 0; i < descs->ndescs; i++) | |
2906 | gpiod_put(descs->desc[i]); | |
2907 | ||
2908 | kfree(descs); | |
2909 | } | |
2910 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
2911 | ||
3c702e99 LW |
2912 | static int __init gpiolib_dev_init(void) |
2913 | { | |
2914 | int ret; | |
2915 | ||
2916 | /* Register GPIO sysfs bus */ | |
2917 | ret = bus_register(&gpio_bus_type); | |
2918 | if (ret < 0) { | |
2919 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
2920 | return ret; | |
2921 | } | |
2922 | ||
2923 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
2924 | if (ret < 0) { | |
2925 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
2926 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
2927 | } else { |
2928 | gpiolib_initialized = true; | |
2929 | gpiochip_setup_devs(); | |
3c702e99 LW |
2930 | } |
2931 | return ret; | |
2932 | } | |
2933 | core_initcall(gpiolib_dev_init); | |
2934 | ||
d2876d08 DB |
2935 | #ifdef CONFIG_DEBUG_FS |
2936 | ||
fdeb8e15 | 2937 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
2938 | { |
2939 | unsigned i; | |
fdeb8e15 LW |
2940 | struct gpio_chip *chip = gdev->chip; |
2941 | unsigned gpio = gdev->base; | |
2942 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 2943 | int is_out; |
d468bf9e | 2944 | int is_irq; |
d2876d08 | 2945 | |
fdeb8e15 | 2946 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
2947 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
2948 | if (gdesc->name) { | |
2949 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
2950 | gpio, gdesc->name); | |
2951 | } | |
d2876d08 | 2952 | continue; |
ced433e2 | 2953 | } |
d2876d08 | 2954 | |
372e722e | 2955 | gpiod_get_direction(gdesc); |
d2876d08 | 2956 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 2957 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
2958 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
2959 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
2960 | is_out ? "out" : "in ", |
2961 | chip->get | |
2962 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2963 | : "? ", |
2964 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2965 | seq_printf(s, "\n"); |
2966 | } | |
2967 | } | |
2968 | ||
f9c4a31f | 2969 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2970 | { |
362432ae | 2971 | unsigned long flags; |
ff2b1359 | 2972 | struct gpio_device *gdev = NULL; |
cb1650d4 | 2973 | loff_t index = *pos; |
d2876d08 | 2974 | |
f9c4a31f | 2975 | s->private = ""; |
d2876d08 | 2976 | |
362432ae | 2977 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 2978 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
2979 | if (index-- == 0) { |
2980 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 2981 | return gdev; |
f9c4a31f | 2982 | } |
362432ae | 2983 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 2984 | |
cb1650d4 | 2985 | return NULL; |
f9c4a31f TR |
2986 | } |
2987 | ||
2988 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2989 | { | |
362432ae | 2990 | unsigned long flags; |
ff2b1359 | 2991 | struct gpio_device *gdev = v; |
f9c4a31f TR |
2992 | void *ret = NULL; |
2993 | ||
362432ae | 2994 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 2995 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
2996 | ret = NULL; |
2997 | else | |
ff2b1359 | 2998 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 2999 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3000 | |
3001 | s->private = "\n"; | |
3002 | ++*pos; | |
3003 | ||
3004 | return ret; | |
3005 | } | |
3006 | ||
3007 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
3008 | { | |
3009 | } | |
3010 | ||
3011 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
3012 | { | |
ff2b1359 LW |
3013 | struct gpio_device *gdev = v; |
3014 | struct gpio_chip *chip = gdev->chip; | |
3015 | struct device *parent; | |
3016 | ||
3017 | if (!chip) { | |
3018 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
3019 | dev_name(&gdev->dev)); | |
3020 | return 0; | |
3021 | } | |
f9c4a31f | 3022 | |
ff2b1359 LW |
3023 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
3024 | dev_name(&gdev->dev), | |
fdeb8e15 | 3025 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
3026 | parent = chip->parent; |
3027 | if (parent) | |
3028 | seq_printf(s, ", parent: %s/%s", | |
3029 | parent->bus ? parent->bus->name : "no-bus", | |
3030 | dev_name(parent)); | |
f9c4a31f TR |
3031 | if (chip->label) |
3032 | seq_printf(s, ", %s", chip->label); | |
3033 | if (chip->can_sleep) | |
3034 | seq_printf(s, ", can sleep"); | |
3035 | seq_printf(s, ":\n"); | |
3036 | ||
3037 | if (chip->dbg_show) | |
3038 | chip->dbg_show(s, chip); | |
3039 | else | |
fdeb8e15 | 3040 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 3041 | |
d2876d08 DB |
3042 | return 0; |
3043 | } | |
3044 | ||
f9c4a31f TR |
3045 | static const struct seq_operations gpiolib_seq_ops = { |
3046 | .start = gpiolib_seq_start, | |
3047 | .next = gpiolib_seq_next, | |
3048 | .stop = gpiolib_seq_stop, | |
3049 | .show = gpiolib_seq_show, | |
3050 | }; | |
3051 | ||
d2876d08 DB |
3052 | static int gpiolib_open(struct inode *inode, struct file *file) |
3053 | { | |
f9c4a31f | 3054 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
3055 | } |
3056 | ||
828c0950 | 3057 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 3058 | .owner = THIS_MODULE, |
d2876d08 DB |
3059 | .open = gpiolib_open, |
3060 | .read = seq_read, | |
3061 | .llseek = seq_lseek, | |
f9c4a31f | 3062 | .release = seq_release, |
d2876d08 DB |
3063 | }; |
3064 | ||
3065 | static int __init gpiolib_debugfs_init(void) | |
3066 | { | |
3067 | /* /sys/kernel/debug/gpio */ | |
3068 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
3069 | NULL, NULL, &gpiolib_operations); | |
3070 | return 0; | |
3071 | } | |
3072 | subsys_initcall(gpiolib_debugfs_init); | |
3073 | ||
3074 | #endif /* DEBUG_FS */ |