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> | |
8b92e17e | 23 | #include <linux/compat.h> |
3c702e99 | 24 | #include <uapi/linux/gpio.h> |
d2876d08 | 25 | |
664e3e5a MW |
26 | #include "gpiolib.h" |
27 | ||
3f397c21 UKK |
28 | #define CREATE_TRACE_POINTS |
29 | #include <trace/events/gpio.h> | |
d2876d08 | 30 | |
79a9becd | 31 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 32 | * |
79a9becd AC |
33 | * The GPIO programming interface allows for inlining speed-critical |
34 | * get/set operations for common cases, so that access to SOC-integrated | |
35 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
36 | */ |
37 | ||
38 | ||
39 | /* When debugging, extend minimal trust to callers and platform code. | |
40 | * Also emit diagnostic messages that may help initial bringup, when | |
41 | * board setup or driver bugs are most common. | |
42 | * | |
43 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
44 | */ | |
45 | #ifdef DEBUG | |
46 | #define extra_checks 1 | |
47 | #else | |
48 | #define extra_checks 0 | |
49 | #endif | |
50 | ||
ff2b1359 LW |
51 | /* Device and char device-related information */ |
52 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
53 | static dev_t gpio_devt; |
54 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
55 | static struct bus_type gpio_bus_type = { | |
56 | .name = "gpio", | |
57 | }; | |
ff2b1359 | 58 | |
d2876d08 DB |
59 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
60 | * While any GPIO is requested, its gpio_chip is not removable; | |
61 | * each GPIO's "requested" flag serves as a lock and refcount. | |
62 | */ | |
0eb4c6c2 | 63 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 64 | |
bae48da2 AC |
65 | static DEFINE_MUTEX(gpio_lookup_lock); |
66 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 67 | LIST_HEAD(gpio_devices); |
6d86750c JH |
68 | |
69 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
70 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
71 | ||
159f3cd9 | 72 | static bool gpiolib_initialized; |
6d86750c | 73 | |
d2876d08 DB |
74 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
75 | { | |
d2876d08 | 76 | d->label = label; |
d2876d08 DB |
77 | } |
78 | ||
372e722e AC |
79 | /** |
80 | * Convert a GPIO number to its descriptor | |
81 | */ | |
79a9becd | 82 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 83 | { |
ff2b1359 | 84 | struct gpio_device *gdev; |
14e85c0e AC |
85 | unsigned long flags; |
86 | ||
87 | spin_lock_irqsave(&gpio_lock, flags); | |
88 | ||
ff2b1359 | 89 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
90 | if (gdev->base <= gpio && |
91 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 92 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 93 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
94 | } |
95 | } | |
96 | ||
97 | spin_unlock_irqrestore(&gpio_lock, flags); | |
98 | ||
0e9a5edf AC |
99 | if (!gpio_is_valid(gpio)) |
100 | WARN(1, "invalid GPIO %d\n", gpio); | |
101 | ||
14e85c0e | 102 | return NULL; |
372e722e | 103 | } |
79a9becd | 104 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 105 | |
d468bf9e | 106 | /** |
bb1e88cc | 107 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 108 | */ |
bb1e88cc AC |
109 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
110 | u16 hwnum) | |
d468bf9e | 111 | { |
fdeb8e15 LW |
112 | struct gpio_device *gdev = chip->gpiodev; |
113 | ||
114 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 115 | return ERR_PTR(-EINVAL); |
d468bf9e | 116 | |
fdeb8e15 | 117 | return &gdev->descs[hwnum]; |
d468bf9e | 118 | } |
372e722e AC |
119 | |
120 | /** | |
121 | * Convert a GPIO descriptor to the integer namespace. | |
122 | * This should disappear in the future but is needed since we still | |
123 | * use GPIO numbers for error messages and sysfs nodes | |
124 | */ | |
79a9becd | 125 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 126 | { |
fdeb8e15 | 127 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 128 | } |
79a9becd | 129 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
130 | |
131 | ||
79a9becd AC |
132 | /** |
133 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
134 | * @desc: descriptor to return the chip of | |
135 | */ | |
136 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 137 | { |
fdeb8e15 LW |
138 | if (!desc || !desc->gdev || !desc->gdev->chip) |
139 | return NULL; | |
140 | return desc->gdev->chip; | |
372e722e | 141 | } |
79a9becd | 142 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 143 | |
8d0aab2f AV |
144 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
145 | static int gpiochip_find_base(int ngpio) | |
146 | { | |
ff2b1359 | 147 | struct gpio_device *gdev; |
83cabe33 | 148 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 149 | |
ff2b1359 | 150 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 151 | /* found a free space? */ |
fdeb8e15 | 152 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
153 | break; |
154 | else | |
155 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 156 | base = gdev->base - ngpio; |
8d0aab2f AV |
157 | } |
158 | ||
83cabe33 | 159 | if (gpio_is_valid(base)) { |
8d0aab2f | 160 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
161 | return base; |
162 | } else { | |
163 | pr_err("%s: cannot find free range\n", __func__); | |
164 | return -ENOSPC; | |
169b6a7a | 165 | } |
169b6a7a AV |
166 | } |
167 | ||
79a9becd AC |
168 | /** |
169 | * gpiod_get_direction - return the current direction of a GPIO | |
170 | * @desc: GPIO to get the direction of | |
171 | * | |
172 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
173 | * | |
174 | * This function may sleep if gpiod_cansleep() is true. | |
175 | */ | |
8e53b0f1 | 176 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
177 | { |
178 | struct gpio_chip *chip; | |
372e722e | 179 | unsigned offset; |
80b0a602 MN |
180 | int status = -EINVAL; |
181 | ||
372e722e AC |
182 | chip = gpiod_to_chip(desc); |
183 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
184 | |
185 | if (!chip->get_direction) | |
186 | return status; | |
187 | ||
372e722e | 188 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
189 | if (status > 0) { |
190 | /* GPIOF_DIR_IN, or other positive */ | |
191 | status = 1; | |
8e53b0f1 | 192 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
193 | } |
194 | if (status == 0) { | |
195 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 196 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
197 | } |
198 | return status; | |
199 | } | |
79a9becd | 200 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 201 | |
1a989d0f AC |
202 | /* |
203 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 204 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
205 | * |
206 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
207 | * space. | |
208 | */ | |
ff2b1359 | 209 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 210 | { |
a961f9b4 | 211 | struct gpio_device *prev, *next; |
1a989d0f | 212 | |
ff2b1359 | 213 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 214 | /* initial entry in list */ |
ff2b1359 | 215 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 216 | return 0; |
1a989d0f AC |
217 | } |
218 | ||
a961f9b4 BJZ |
219 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
220 | if (gdev->base + gdev->ngpio <= next->base) { | |
221 | /* add before first entry */ | |
222 | list_add(&gdev->list, &gpio_devices); | |
223 | return 0; | |
1a989d0f AC |
224 | } |
225 | ||
a961f9b4 BJZ |
226 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
227 | if (prev->base + prev->ngpio <= gdev->base) { | |
228 | /* add behind last entry */ | |
229 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 230 | return 0; |
1a989d0f AC |
231 | } |
232 | ||
a961f9b4 BJZ |
233 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
234 | /* at the end of the list */ | |
235 | if (&next->list == &gpio_devices) | |
236 | break; | |
1a989d0f | 237 | |
a961f9b4 BJZ |
238 | /* add between prev and next */ |
239 | if (prev->base + prev->ngpio <= gdev->base | |
240 | && gdev->base + gdev->ngpio <= next->base) { | |
241 | list_add(&gdev->list, &prev->list); | |
242 | return 0; | |
243 | } | |
244 | } | |
245 | ||
246 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
247 | return -EBUSY; | |
1a989d0f AC |
248 | } |
249 | ||
f881bab0 LW |
250 | /** |
251 | * Convert a GPIO name to its descriptor | |
252 | */ | |
253 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
254 | { | |
ff2b1359 | 255 | struct gpio_device *gdev; |
f881bab0 LW |
256 | unsigned long flags; |
257 | ||
258 | spin_lock_irqsave(&gpio_lock, flags); | |
259 | ||
ff2b1359 | 260 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
261 | int i; |
262 | ||
fdeb8e15 LW |
263 | for (i = 0; i != gdev->ngpio; ++i) { |
264 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 265 | |
fdeb8e15 | 266 | if (!desc->name || !name) |
f881bab0 LW |
267 | continue; |
268 | ||
fdeb8e15 | 269 | if (!strcmp(desc->name, name)) { |
f881bab0 | 270 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 271 | return desc; |
f881bab0 LW |
272 | } |
273 | } | |
274 | } | |
275 | ||
276 | spin_unlock_irqrestore(&gpio_lock, flags); | |
277 | ||
278 | return NULL; | |
279 | } | |
280 | ||
5f3ca732 MP |
281 | /* |
282 | * Takes the names from gc->names and checks if they are all unique. If they | |
283 | * are, they are assigned to their gpio descriptors. | |
284 | * | |
ed37915c | 285 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
286 | */ |
287 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
288 | { | |
fdeb8e15 | 289 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
290 | int i; |
291 | ||
292 | if (!gc->names) | |
293 | return 0; | |
294 | ||
295 | /* First check all names if they are unique */ | |
296 | for (i = 0; i != gc->ngpio; ++i) { | |
297 | struct gpio_desc *gpio; | |
298 | ||
299 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 300 | if (gpio) |
fdeb8e15 | 301 | dev_warn(&gdev->dev, |
34ffd85d | 302 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 303 | gc->names[i]); |
5f3ca732 MP |
304 | } |
305 | ||
306 | /* Then add all names to the GPIO descriptors */ | |
307 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 308 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
309 | |
310 | return 0; | |
311 | } | |
312 | ||
3c702e99 LW |
313 | /** |
314 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
315 | */ | |
316 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
317 | { | |
318 | struct gpio_device *gdev = filp->private_data; | |
319 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 320 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
321 | |
322 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
323 | if (!chip) | |
324 | return -ENODEV; | |
325 | ||
521a2ad6 | 326 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 327 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
328 | struct gpiochip_info chipinfo; |
329 | ||
3c702e99 LW |
330 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
331 | sizeof(chipinfo.name)); | |
332 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
333 | strncpy(chipinfo.label, gdev->label, |
334 | sizeof(chipinfo.label)); | |
335 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 336 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
337 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
338 | return -EFAULT; | |
339 | return 0; | |
521a2ad6 LW |
340 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
341 | struct gpioline_info lineinfo; | |
342 | struct gpio_desc *desc; | |
343 | ||
344 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
345 | return -EFAULT; | |
346 | if (lineinfo.line_offset > gdev->ngpio) | |
347 | return -EINVAL; | |
348 | ||
349 | desc = &gdev->descs[lineinfo.line_offset]; | |
350 | if (desc->name) { | |
351 | strncpy(lineinfo.name, desc->name, | |
352 | sizeof(lineinfo.name)); | |
353 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
354 | } else { | |
355 | lineinfo.name[0] = '\0'; | |
356 | } | |
357 | if (desc->label) { | |
214338e3 LW |
358 | strncpy(lineinfo.consumer, desc->label, |
359 | sizeof(lineinfo.consumer)); | |
360 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 361 | } else { |
214338e3 | 362 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
363 | } |
364 | ||
365 | /* | |
366 | * Userspace only need to know that the kernel is using | |
367 | * this GPIO so it can't use it. | |
368 | */ | |
369 | lineinfo.flags = 0; | |
9d8cc89c LW |
370 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
371 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
372 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
373 | test_bit(FLAG_EXPORT, &desc->flags) || | |
374 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 375 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 376 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 377 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 378 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 379 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 380 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 381 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 382 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
383 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
384 | ||
385 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
386 | return -EFAULT; | |
387 | return 0; | |
3c702e99 LW |
388 | } |
389 | return -EINVAL; | |
390 | } | |
391 | ||
8b92e17e LW |
392 | #ifdef CONFIG_COMPAT |
393 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
394 | unsigned long arg) | |
395 | { | |
396 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
397 | } | |
398 | #endif | |
399 | ||
3c702e99 LW |
400 | /** |
401 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
402 | * @inode: inode for this chardev | |
403 | * @filp: file struct for storing private data | |
404 | * Returns 0 on success | |
405 | */ | |
406 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
407 | { | |
408 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
409 | struct gpio_device, chrdev); | |
410 | ||
411 | /* Fail on open if the backing gpiochip is gone */ | |
412 | if (!gdev || !gdev->chip) | |
413 | return -ENODEV; | |
414 | get_device(&gdev->dev); | |
415 | filp->private_data = gdev; | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /** | |
420 | * gpio_chrdev_release() - close chardev after ioctl operations | |
421 | * @inode: inode for this chardev | |
422 | * @filp: file struct for storing private data | |
423 | * Returns 0 on success | |
424 | */ | |
425 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
426 | { | |
427 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
428 | struct gpio_device, chrdev); | |
429 | ||
430 | if (!gdev) | |
431 | return -ENODEV; | |
432 | put_device(&gdev->dev); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | ||
437 | static const struct file_operations gpio_fileops = { | |
438 | .release = gpio_chrdev_release, | |
439 | .open = gpio_chrdev_open, | |
440 | .owner = THIS_MODULE, | |
441 | .llseek = noop_llseek, | |
442 | .unlocked_ioctl = gpio_ioctl, | |
8b92e17e LW |
443 | #ifdef CONFIG_COMPAT |
444 | .compat_ioctl = gpio_ioctl_compat, | |
445 | #endif | |
3c702e99 LW |
446 | }; |
447 | ||
ff2b1359 LW |
448 | static void gpiodevice_release(struct device *dev) |
449 | { | |
450 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
451 | ||
452 | list_del(&gdev->list); | |
453 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
454 | kfree(gdev->label); |
455 | kfree(gdev->descs); | |
9efd9e69 | 456 | kfree(gdev); |
ff2b1359 LW |
457 | } |
458 | ||
159f3cd9 GR |
459 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
460 | { | |
461 | int status; | |
462 | ||
463 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
464 | gdev->chrdev.owner = THIS_MODULE; | |
465 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
466 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
467 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
468 | if (status < 0) | |
469 | chip_warn(gdev->chip, "failed to add char device %d:%d\n", | |
470 | MAJOR(gpio_devt), gdev->id); | |
471 | else | |
472 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
473 | MAJOR(gpio_devt), gdev->id); | |
474 | status = device_add(&gdev->dev); | |
475 | if (status) | |
476 | goto err_remove_chardev; | |
477 | ||
478 | status = gpiochip_sysfs_register(gdev); | |
479 | if (status) | |
480 | goto err_remove_device; | |
481 | ||
482 | /* From this point, the .release() function cleans up gpio_device */ | |
483 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
484 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
485 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
486 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
487 | ||
488 | return 0; | |
489 | ||
490 | err_remove_device: | |
491 | device_del(&gdev->dev); | |
492 | err_remove_chardev: | |
493 | cdev_del(&gdev->chrdev); | |
494 | return status; | |
495 | } | |
496 | ||
497 | static void gpiochip_setup_devs(void) | |
498 | { | |
499 | struct gpio_device *gdev; | |
500 | int err; | |
501 | ||
502 | list_for_each_entry(gdev, &gpio_devices, list) { | |
503 | err = gpiochip_setup_dev(gdev); | |
504 | if (err) | |
505 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
506 | dev_name(&gdev->dev), err); | |
507 | } | |
508 | } | |
509 | ||
d2876d08 | 510 | /** |
b08ea35a | 511 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 512 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 513 | * Context: potentially before irqs will work |
d2876d08 DB |
514 | * |
515 | * Returns a negative errno if the chip can't be registered, such as | |
516 | * because the chip->base is invalid or already associated with a | |
517 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 518 | * |
b08ea35a | 519 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 520 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
521 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
522 | * for GPIOs will fail rudely. | |
523 | * | |
159f3cd9 GR |
524 | * gpiochip_add_data() must only be called after gpiolib initialization, |
525 | * ie after core_initcall(). | |
526 | * | |
8d0aab2f AV |
527 | * If chip->base is negative, this requests dynamic assignment of |
528 | * a range of valid GPIOs. | |
d2876d08 | 529 | */ |
b08ea35a | 530 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
531 | { |
532 | unsigned long flags; | |
533 | int status = 0; | |
ff2b1359 | 534 | unsigned i; |
8d0aab2f | 535 | int base = chip->base; |
ff2b1359 | 536 | struct gpio_device *gdev; |
d2876d08 | 537 | |
ff2b1359 LW |
538 | /* |
539 | * First: allocate and populate the internal stat container, and | |
540 | * set up the struct device. | |
541 | */ | |
969f07b4 | 542 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 543 | if (!gdev) |
14e85c0e | 544 | return -ENOMEM; |
3c702e99 | 545 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
546 | gdev->chip = chip; |
547 | chip->gpiodev = gdev; | |
548 | if (chip->parent) { | |
549 | gdev->dev.parent = chip->parent; | |
550 | gdev->dev.of_node = chip->parent->of_node; | |
551 | } else { | |
552 | #ifdef CONFIG_OF_GPIO | |
553 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
554 | if (chip->of_node) | |
555 | gdev->dev.of_node = chip->of_node; | |
556 | #endif | |
557 | } | |
558 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); | |
559 | if (gdev->id < 0) { | |
560 | status = gdev->id; | |
561 | goto err_free_gdev; | |
562 | } | |
563 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
564 | device_initialize(&gdev->dev); | |
565 | dev_set_drvdata(&gdev->dev, gdev); | |
566 | if (chip->parent && chip->parent->driver) | |
567 | gdev->owner = chip->parent->driver->owner; | |
568 | else if (chip->owner) | |
569 | /* TODO: remove chip->owner */ | |
570 | gdev->owner = chip->owner; | |
571 | else | |
572 | gdev->owner = THIS_MODULE; | |
d2876d08 | 573 | |
476e2fc5 | 574 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 575 | if (!gdev->descs) { |
ff2b1359 LW |
576 | status = -ENOMEM; |
577 | goto err_free_gdev; | |
578 | } | |
579 | ||
5ed41cc4 BJZ |
580 | if (chip->ngpio == 0) { |
581 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 582 | status = -EINVAL; |
159f3cd9 | 583 | goto err_free_descs; |
5ed41cc4 | 584 | } |
df4878e9 LW |
585 | |
586 | if (chip->label) | |
476e2fc5 | 587 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 588 | else |
476e2fc5 | 589 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
590 | if (!gdev->label) { |
591 | status = -ENOMEM; | |
476e2fc5 | 592 | goto err_free_descs; |
df4878e9 LW |
593 | } |
594 | ||
fdeb8e15 | 595 | gdev->ngpio = chip->ngpio; |
43c54eca | 596 | gdev->data = data; |
5ed41cc4 | 597 | |
d2876d08 DB |
598 | spin_lock_irqsave(&gpio_lock, flags); |
599 | ||
fdeb8e15 LW |
600 | /* |
601 | * TODO: this allocates a Linux GPIO number base in the global | |
602 | * GPIO numberspace for this chip. In the long run we want to | |
603 | * get *rid* of this numberspace and use only descriptors, but | |
604 | * it may be a pipe dream. It will not happen before we get rid | |
605 | * of the sysfs interface anyways. | |
606 | */ | |
8d0aab2f AV |
607 | if (base < 0) { |
608 | base = gpiochip_find_base(chip->ngpio); | |
609 | if (base < 0) { | |
610 | status = base; | |
225fce83 | 611 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 612 | goto err_free_label; |
8d0aab2f | 613 | } |
fdeb8e15 LW |
614 | /* |
615 | * TODO: it should not be necessary to reflect the assigned | |
616 | * base outside of the GPIO subsystem. Go over drivers and | |
617 | * see if anyone makes use of this, else drop this and assign | |
618 | * a poison instead. | |
619 | */ | |
8d0aab2f AV |
620 | chip->base = base; |
621 | } | |
fdeb8e15 | 622 | gdev->base = base; |
8d0aab2f | 623 | |
ff2b1359 | 624 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
625 | if (status) { |
626 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 627 | goto err_free_label; |
05aa5203 | 628 | } |
1a989d0f | 629 | |
545ebd9a LW |
630 | spin_unlock_irqrestore(&gpio_lock, flags); |
631 | ||
ff2b1359 | 632 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 633 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 634 | |
fdeb8e15 | 635 | desc->gdev = gdev; |
72d32000 LW |
636 | /* |
637 | * REVISIT: most hardware initializes GPIOs as inputs | |
638 | * (often with pullups enabled) so power usage is | |
639 | * minimized. Linux code should set the gpio direction | |
640 | * first thing; but until it does, and in case | |
641 | * chip->get_direction is not set, we may expose the | |
642 | * wrong direction in sysfs. | |
05aa5203 | 643 | */ |
72d32000 LW |
644 | |
645 | if (chip->get_direction) { | |
646 | /* | |
647 | * If we have .get_direction, set up the initial | |
648 | * direction flag from the hardware. | |
649 | */ | |
650 | int dir = chip->get_direction(chip, i); | |
651 | ||
652 | if (!dir) | |
653 | set_bit(FLAG_IS_OUT, &desc->flags); | |
654 | } else if (!chip->direction_input) { | |
655 | /* | |
656 | * If the chip lacks the .direction_input callback | |
657 | * we logically assume all lines are outputs. | |
658 | */ | |
659 | set_bit(FLAG_IS_OUT, &desc->flags); | |
660 | } | |
d2876d08 | 661 | } |
14e85c0e | 662 | |
f23f1516 | 663 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 664 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
665 | #endif |
666 | ||
5f3ca732 MP |
667 | status = gpiochip_set_desc_names(chip); |
668 | if (status) | |
669 | goto err_remove_from_list; | |
670 | ||
28355f81 TV |
671 | status = of_gpiochip_add(chip); |
672 | if (status) | |
673 | goto err_remove_chip; | |
674 | ||
664e3e5a | 675 | acpi_gpiochip_add(chip); |
391c970c | 676 | |
3c702e99 LW |
677 | /* |
678 | * By first adding the chardev, and then adding the device, | |
679 | * we get a device node entry in sysfs under | |
680 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
681 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
682 | * We can do this only if gpiolib has been initialized. |
683 | * Otherwise, defer until later. | |
3c702e99 | 684 | */ |
159f3cd9 GR |
685 | if (gpiolib_initialized) { |
686 | status = gpiochip_setup_dev(gdev); | |
687 | if (status) | |
688 | goto err_remove_chip; | |
689 | } | |
cedb1881 | 690 | return 0; |
3bae4811 | 691 | |
225fce83 JH |
692 | err_remove_chip: |
693 | acpi_gpiochip_remove(chip); | |
6d86750c | 694 | gpiochip_free_hogs(chip); |
225fce83 | 695 | of_gpiochip_remove(chip); |
5f3ca732 | 696 | err_remove_from_list: |
225fce83 | 697 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 698 | list_del(&gdev->list); |
3bae4811 | 699 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
700 | err_free_label: |
701 | kfree(gdev->label); | |
702 | err_free_descs: | |
703 | kfree(gdev->descs); | |
ff2b1359 LW |
704 | err_free_gdev: |
705 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 706 | /* failures here can mean systems won't boot... */ |
7589e59f | 707 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
708 | gdev->base, gdev->base + gdev->ngpio - 1, |
709 | chip->label ? : "generic"); | |
710 | kfree(gdev); | |
d2876d08 DB |
711 | return status; |
712 | } | |
b08ea35a | 713 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 714 | |
43c54eca LW |
715 | /** |
716 | * gpiochip_get_data() - get per-subdriver data for the chip | |
717 | */ | |
718 | void *gpiochip_get_data(struct gpio_chip *chip) | |
719 | { | |
720 | return chip->gpiodev->data; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
723 | ||
d2876d08 DB |
724 | /** |
725 | * gpiochip_remove() - unregister a gpio_chip | |
726 | * @chip: the chip to unregister | |
727 | * | |
728 | * A gpio_chip with any GPIOs still requested may not be removed. | |
729 | */ | |
e1db1706 | 730 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 731 | { |
ff2b1359 | 732 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 733 | struct gpio_desc *desc; |
d2876d08 | 734 | unsigned long flags; |
1c3cdb18 | 735 | unsigned i; |
fab28b89 | 736 | bool requested = false; |
d2876d08 | 737 | |
ff2b1359 | 738 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 739 | gpiochip_sysfs_unregister(gdev); |
bd203bd5 BJZ |
740 | /* Numb the device, cancelling all outstanding operations */ |
741 | gdev->chip = NULL; | |
00acc3dc | 742 | gpiochip_irqchip_remove(chip); |
6072b9dc | 743 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 744 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 745 | gpiochip_free_hogs(chip); |
391c970c | 746 | of_gpiochip_remove(chip); |
43c54eca LW |
747 | /* |
748 | * We accept no more calls into the driver from this point, so | |
749 | * NULL the driver data pointer | |
750 | */ | |
751 | gdev->data = NULL; | |
391c970c | 752 | |
6798acaa | 753 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 754 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 755 | desc = &gdev->descs[i]; |
fab28b89 JH |
756 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
757 | requested = true; | |
d2876d08 | 758 | } |
d2876d08 | 759 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 760 | |
fab28b89 | 761 | if (requested) |
fdeb8e15 | 762 | dev_crit(&gdev->dev, |
58383c78 | 763 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 764 | |
ff2b1359 LW |
765 | /* |
766 | * The gpiochip side puts its use of the device to rest here: | |
767 | * if there are no userspace clients, the chardev and device will | |
768 | * be removed, else it will be dangling until the last user is | |
769 | * gone. | |
770 | */ | |
f4833b8c RRD |
771 | cdev_del(&gdev->chrdev); |
772 | device_del(&gdev->dev); | |
ff2b1359 | 773 | put_device(&gdev->dev); |
d2876d08 DB |
774 | } |
775 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
776 | ||
0cf3292c LD |
777 | static void devm_gpio_chip_release(struct device *dev, void *res) |
778 | { | |
779 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
780 | ||
781 | gpiochip_remove(chip); | |
782 | } | |
783 | ||
784 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
785 | ||
786 | { | |
787 | struct gpio_chip **r = res; | |
788 | ||
789 | if (!r || !*r) { | |
790 | WARN_ON(!r || !*r); | |
791 | return 0; | |
792 | } | |
793 | ||
794 | return *r == data; | |
795 | } | |
796 | ||
797 | /** | |
798 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
799 | * @dev: the device pointer on which irq_chip belongs to. | |
800 | * @chip: the chip to register, with chip->base initialized | |
801 | * Context: potentially before irqs will work | |
802 | * | |
803 | * Returns a negative errno if the chip can't be registered, such as | |
804 | * because the chip->base is invalid or already associated with a | |
805 | * different chip. Otherwise it returns zero as a success code. | |
806 | * | |
807 | * The gpio chip automatically be released when the device is unbound. | |
808 | */ | |
809 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
810 | void *data) | |
811 | { | |
812 | struct gpio_chip **ptr; | |
813 | int ret; | |
814 | ||
815 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
816 | GFP_KERNEL); | |
817 | if (!ptr) | |
818 | return -ENOMEM; | |
819 | ||
820 | ret = gpiochip_add_data(chip, data); | |
821 | if (ret < 0) { | |
822 | devres_free(ptr); | |
823 | return ret; | |
824 | } | |
825 | ||
826 | *ptr = chip; | |
827 | devres_add(dev, ptr); | |
828 | ||
829 | return 0; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
832 | ||
833 | /** | |
834 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
835 | * @dev: device for which which resource was allocated | |
836 | * @chip: the chip to remove | |
837 | * | |
838 | * A gpio_chip with any GPIOs still requested may not be removed. | |
839 | */ | |
840 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
841 | { | |
842 | int ret; | |
843 | ||
844 | ret = devres_release(dev, devm_gpio_chip_release, | |
845 | devm_gpio_chip_match, chip); | |
846 | if (!ret) | |
847 | WARN_ON(ret); | |
848 | } | |
849 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
850 | ||
594fa265 GL |
851 | /** |
852 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
853 | * @data: data to pass to match function | |
854 | * @callback: Callback function to check gpio_chip | |
855 | * | |
856 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
857 | * determined by a user supplied @match callback. The callback should return | |
858 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
859 | * non-zero, this function will return to the caller and not iterate over any | |
860 | * more gpio_chips. | |
861 | */ | |
07ce8ec7 | 862 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 863 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 864 | void *data)) |
594fa265 | 865 | { |
ff2b1359 | 866 | struct gpio_device *gdev; |
125eef96 | 867 | struct gpio_chip *chip; |
594fa265 | 868 | unsigned long flags; |
594fa265 GL |
869 | |
870 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 871 | list_for_each_entry(gdev, &gpio_devices, list) |
11f33a6d | 872 | if (gdev->chip && match(gdev->chip, data)) |
594fa265 | 873 | break; |
125eef96 AC |
874 | |
875 | /* No match? */ | |
ff2b1359 | 876 | if (&gdev->list == &gpio_devices) |
125eef96 | 877 | chip = NULL; |
ff2b1359 LW |
878 | else |
879 | chip = gdev->chip; | |
880 | ||
594fa265 GL |
881 | spin_unlock_irqrestore(&gpio_lock, flags); |
882 | ||
883 | return chip; | |
884 | } | |
8fa0c9bf | 885 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 886 | |
79697ef9 AC |
887 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
888 | { | |
889 | const char *name = data; | |
890 | ||
891 | return !strcmp(chip->label, name); | |
892 | } | |
893 | ||
894 | static struct gpio_chip *find_chip_by_name(const char *name) | |
895 | { | |
896 | return gpiochip_find((void *)name, gpiochip_match_name); | |
897 | } | |
898 | ||
14250520 LW |
899 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
900 | ||
901 | /* | |
902 | * The following is irqchip helper code for gpiochips. | |
903 | */ | |
904 | ||
905 | /** | |
3f97d5fc LW |
906 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
907 | * @gpiochip: the gpiochip to set the irqchip chain to | |
908 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
909 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
910 | * chained irqchip | |
911 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
912 | * coming out of the gpiochip. If the interrupt is nested rather than |
913 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
914 | */ |
915 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
916 | struct irq_chip *irqchip, | |
917 | int parent_irq, | |
918 | irq_flow_handler_t parent_handler) | |
919 | { | |
83141a77 LW |
920 | unsigned int offset; |
921 | ||
83141a77 LW |
922 | if (!gpiochip->irqdomain) { |
923 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
924 | __func__); | |
1c8732bb LW |
925 | return; |
926 | } | |
927 | ||
3f97d5fc LW |
928 | if (parent_handler) { |
929 | if (gpiochip->can_sleep) { | |
930 | chip_err(gpiochip, | |
931 | "you cannot have chained interrupts on a " | |
932 | "chip that may sleep\n"); | |
933 | return; | |
934 | } | |
3f97d5fc LW |
935 | /* |
936 | * The parent irqchip is already using the chip_data for this | |
937 | * irqchip, so our callbacks simply use the handler_data. | |
938 | */ | |
f7f87753 TG |
939 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
940 | gpiochip); | |
25e4fe92 DES |
941 | |
942 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 943 | } |
83141a77 LW |
944 | |
945 | /* Set the parent IRQ for all affected IRQs */ | |
946 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
947 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
948 | parent_irq); | |
14250520 LW |
949 | } |
950 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
951 | ||
952 | /** | |
953 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
954 | * @d: the irqdomain used by this irqchip | |
955 | * @irq: the global irq number used by this GPIO irqchip irq | |
956 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
957 | * | |
958 | * This function will set up the mapping for a certain IRQ line on a | |
959 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
960 | * stored inside the gpiochip. | |
961 | */ | |
962 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
963 | irq_hw_number_t hwirq) | |
964 | { | |
965 | struct gpio_chip *chip = d->host_data; | |
966 | ||
14250520 | 967 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
968 | /* |
969 | * This lock class tells lockdep that GPIO irqs are in a different | |
970 | * category than their parents, so it won't report false recursion. | |
971 | */ | |
972 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 973 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 974 | /* Chips that can sleep need nested thread handlers */ |
295494af | 975 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 976 | irq_set_nested_thread(irq, 1); |
14250520 | 977 | irq_set_noprobe(irq); |
23393d49 | 978 | |
1333b90f LW |
979 | /* |
980 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
981 | * is passed as default type. | |
982 | */ | |
983 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
984 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
985 | |
986 | return 0; | |
987 | } | |
988 | ||
c3626fde LW |
989 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
990 | { | |
1c8732bb LW |
991 | struct gpio_chip *chip = d->host_data; |
992 | ||
1c8732bb LW |
993 | if (chip->can_sleep) |
994 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
995 | irq_set_chip_and_handler(irq, NULL, NULL); |
996 | irq_set_chip_data(irq, NULL); | |
997 | } | |
998 | ||
14250520 LW |
999 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1000 | .map = gpiochip_irq_map, | |
c3626fde | 1001 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1002 | /* Virtually all GPIO irqchips are twocell:ed */ |
1003 | .xlate = irq_domain_xlate_twocell, | |
1004 | }; | |
1005 | ||
1006 | static int gpiochip_irq_reqres(struct irq_data *d) | |
1007 | { | |
1008 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1009 | ||
ff2b1359 | 1010 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1011 | return -ENODEV; |
1012 | ||
e3a2e878 | 1013 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1014 | chip_err(chip, |
1015 | "unable to lock HW IRQ %lu for IRQ\n", | |
1016 | d->hwirq); | |
ff2b1359 | 1017 | module_put(chip->gpiodev->owner); |
14250520 LW |
1018 | return -EINVAL; |
1019 | } | |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | static void gpiochip_irq_relres(struct irq_data *d) | |
1024 | { | |
1025 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1026 | ||
e3a2e878 | 1027 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1028 | module_put(chip->gpiodev->owner); |
14250520 LW |
1029 | } |
1030 | ||
1031 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1032 | { | |
1033 | return irq_find_mapping(chip->irqdomain, offset); | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1038 | * @gpiochip: the gpiochip to remove the irqchip from | |
1039 | * | |
1040 | * This is called only from gpiochip_remove() | |
1041 | */ | |
1042 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1043 | { | |
c3626fde LW |
1044 | unsigned int offset; |
1045 | ||
afa82fab MW |
1046 | acpi_gpiochip_free_interrupts(gpiochip); |
1047 | ||
25e4fe92 DES |
1048 | if (gpiochip->irq_parent) { |
1049 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
1050 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
1051 | } | |
1052 | ||
c3626fde LW |
1053 | /* Remove all IRQ mappings and delete the domain */ |
1054 | if (gpiochip->irqdomain) { | |
1055 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
1056 | irq_dispose_mapping( |
1057 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 1058 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 1059 | } |
14250520 LW |
1060 | |
1061 | if (gpiochip->irqchip) { | |
1062 | gpiochip->irqchip->irq_request_resources = NULL; | |
1063 | gpiochip->irqchip->irq_release_resources = NULL; | |
1064 | gpiochip->irqchip = NULL; | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
1070 | * @gpiochip: the gpiochip to add the irqchip to | |
1071 | * @irqchip: the irqchip to add to the gpiochip | |
1072 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1073 | * allocate gpiochip irqs from | |
1074 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1075 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1076 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 1077 | * @lock_key: lockdep class |
14250520 LW |
1078 | * |
1079 | * This function closely associates a certain irqchip with a certain | |
1080 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1081 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1082 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1083 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1084 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1085 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1086 | * translation. The gpiochip will need to be initialized and registered | |
1087 | * before calling this function. | |
1088 | * | |
c3626fde LW |
1089 | * This function will handle two cell:ed simple IRQs and assumes all |
1090 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1091 | * need to be open coded. |
1092 | */ | |
a0a8bcf4 GS |
1093 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
1094 | struct irq_chip *irqchip, | |
1095 | unsigned int first_irq, | |
1096 | irq_flow_handler_t handler, | |
1097 | unsigned int type, | |
1098 | struct lock_class_key *lock_key) | |
14250520 LW |
1099 | { |
1100 | struct device_node *of_node; | |
1101 | unsigned int offset; | |
c3626fde | 1102 | unsigned irq_base = 0; |
14250520 LW |
1103 | |
1104 | if (!gpiochip || !irqchip) | |
1105 | return -EINVAL; | |
1106 | ||
58383c78 | 1107 | if (!gpiochip->parent) { |
14250520 LW |
1108 | pr_err("missing gpiochip .dev parent pointer\n"); |
1109 | return -EINVAL; | |
1110 | } | |
58383c78 | 1111 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1112 | #ifdef CONFIG_OF_GPIO |
1113 | /* | |
20a8a968 | 1114 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1115 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1116 | * everywhere | |
14250520 LW |
1117 | */ |
1118 | if (gpiochip->of_node) | |
1119 | of_node = gpiochip->of_node; | |
1120 | #endif | |
1121 | gpiochip->irqchip = irqchip; | |
1122 | gpiochip->irq_handler = handler; | |
1123 | gpiochip->irq_default_type = type; | |
1124 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 1125 | gpiochip->lock_key = lock_key; |
14250520 LW |
1126 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1127 | gpiochip->ngpio, first_irq, | |
1128 | &gpiochip_domain_ops, gpiochip); | |
1129 | if (!gpiochip->irqdomain) { | |
1130 | gpiochip->irqchip = NULL; | |
1131 | return -EINVAL; | |
1132 | } | |
8b67a1f0 RV |
1133 | |
1134 | /* | |
1135 | * It is possible for a driver to override this, but only if the | |
1136 | * alternative functions are both implemented. | |
1137 | */ | |
1138 | if (!irqchip->irq_request_resources && | |
1139 | !irqchip->irq_release_resources) { | |
1140 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1141 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1142 | } | |
14250520 LW |
1143 | |
1144 | /* | |
1145 | * Prepare the mapping since the irqchip shall be orthogonal to | |
1146 | * any gpiochip calls. If the first_irq was zero, this is | |
1147 | * necessary to allocate descriptors for all IRQs. | |
1148 | */ | |
c3626fde LW |
1149 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1150 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
1151 | if (offset == 0) | |
1152 | /* | |
1153 | * Store the base into the gpiochip to be used when | |
1154 | * unmapping the irqs. | |
1155 | */ | |
1156 | gpiochip->irq_base = irq_base; | |
1157 | } | |
14250520 | 1158 | |
afa82fab MW |
1159 | acpi_gpiochip_request_interrupts(gpiochip); |
1160 | ||
14250520 LW |
1161 | return 0; |
1162 | } | |
a0a8bcf4 | 1163 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
1164 | |
1165 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1166 | ||
1167 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
1168 | ||
1169 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1170 | ||
c771c2f4 JG |
1171 | /** |
1172 | * gpiochip_generic_request() - request the gpio function for a pin | |
1173 | * @chip: the gpiochip owning the GPIO | |
1174 | * @offset: the offset of the GPIO to request for GPIO function | |
1175 | */ | |
1176 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1177 | { | |
fdeb8e15 | 1178 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1179 | } |
1180 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1181 | ||
1182 | /** | |
1183 | * gpiochip_generic_free() - free the gpio function from a pin | |
1184 | * @chip: the gpiochip to request the gpio function for | |
1185 | * @offset: the offset of the GPIO to free from GPIO function | |
1186 | */ | |
1187 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1188 | { | |
fdeb8e15 | 1189 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1190 | } |
1191 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1192 | ||
f23f1516 | 1193 | #ifdef CONFIG_PINCTRL |
165adc9c | 1194 | |
586a87e6 CR |
1195 | /** |
1196 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1197 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1198 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1199 | * @gpio_offset: the start offset in the current gpio_chip number space |
1200 | * @pin_group: name of the pin group inside the pin controller | |
1201 | */ | |
1202 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1203 | struct pinctrl_dev *pctldev, | |
1204 | unsigned int gpio_offset, const char *pin_group) | |
1205 | { | |
1206 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1207 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1208 | int ret; |
1209 | ||
1210 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1211 | if (!pin_range) { | |
1a2a99c6 | 1212 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1213 | return -ENOMEM; |
1214 | } | |
1215 | ||
1216 | /* Use local offset as range ID */ | |
1217 | pin_range->range.id = gpio_offset; | |
1218 | pin_range->range.gc = chip; | |
1219 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1220 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1221 | pin_range->pctldev = pctldev; |
1222 | ||
1223 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1224 | &pin_range->range.pins, | |
1225 | &pin_range->range.npins); | |
61c6375d MN |
1226 | if (ret < 0) { |
1227 | kfree(pin_range); | |
586a87e6 | 1228 | return ret; |
61c6375d | 1229 | } |
586a87e6 CR |
1230 | |
1231 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1232 | ||
1a2a99c6 AS |
1233 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1234 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1235 | pinctrl_dev_get_devname(pctldev), pin_group); |
1236 | ||
20ec3e39 | 1237 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1238 | |
1239 | return 0; | |
1240 | } | |
1241 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1242 | ||
3f0f8670 LW |
1243 | /** |
1244 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1245 | * @chip: the gpiochip to add the range for | |
1246 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1247 | * @gpio_offset: the start offset in the current gpio_chip number space |
1248 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1249 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1250 | * pin controller) to accumulate in this range | |
1251 | */ | |
1e63d7b9 | 1252 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1253 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1254 | unsigned int npins) |
f23f1516 SH |
1255 | { |
1256 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1257 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1258 | int ret; |
f23f1516 | 1259 | |
3f0f8670 | 1260 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1261 | if (!pin_range) { |
1a2a99c6 | 1262 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1263 | return -ENOMEM; |
f23f1516 SH |
1264 | } |
1265 | ||
3f0f8670 | 1266 | /* Use local offset as range ID */ |
316511c0 | 1267 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1268 | pin_range->range.gc = chip; |
f23f1516 | 1269 | pin_range->range.name = chip->label; |
fdeb8e15 | 1270 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1271 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1272 | pin_range->range.npins = npins; |
192c369c | 1273 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1274 | &pin_range->range); |
8f23ca1a | 1275 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1276 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1277 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1278 | kfree(pin_range); |
b4d4b1f0 | 1279 | return ret; |
3f0f8670 | 1280 | } |
1a2a99c6 AS |
1281 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1282 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1283 | pinctl_name, |
1284 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1285 | |
20ec3e39 | 1286 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1287 | |
1288 | return 0; | |
f23f1516 | 1289 | } |
165adc9c | 1290 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1291 | |
3f0f8670 LW |
1292 | /** |
1293 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1294 | * @chip: the chip to remove all the mappings for | |
1295 | */ | |
f23f1516 SH |
1296 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1297 | { | |
1298 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1299 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1300 | |
20ec3e39 | 1301 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1302 | list_del(&pin_range->node); |
1303 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1304 | &pin_range->range); | |
3f0f8670 | 1305 | kfree(pin_range); |
f23f1516 SH |
1306 | } |
1307 | } | |
165adc9c LW |
1308 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1309 | ||
1310 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1311 | |
d2876d08 DB |
1312 | /* These "optional" allocation calls help prevent drivers from stomping |
1313 | * on each other, and help provide better diagnostics in debugfs. | |
1314 | * They're called even less than the "set direction" calls. | |
1315 | */ | |
77c2d792 | 1316 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1317 | { |
fdeb8e15 | 1318 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1319 | int status; |
d2876d08 DB |
1320 | unsigned long flags; |
1321 | ||
bcabdef1 AC |
1322 | spin_lock_irqsave(&gpio_lock, flags); |
1323 | ||
d2876d08 | 1324 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1325 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1326 | */ |
1327 | ||
1328 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1329 | desc_set_label(desc, label ? : "?"); | |
1330 | status = 0; | |
438d8908 | 1331 | } else { |
d2876d08 | 1332 | status = -EBUSY; |
7460db56 | 1333 | goto done; |
35e8bb51 DB |
1334 | } |
1335 | ||
1336 | if (chip->request) { | |
1337 | /* chip->request may sleep */ | |
1338 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1339 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1340 | spin_lock_irqsave(&gpio_lock, flags); |
1341 | ||
1342 | if (status < 0) { | |
1343 | desc_set_label(desc, NULL); | |
35e8bb51 | 1344 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1345 | goto done; |
35e8bb51 | 1346 | } |
438d8908 | 1347 | } |
80b0a602 MN |
1348 | if (chip->get_direction) { |
1349 | /* chip->get_direction may sleep */ | |
1350 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1351 | gpiod_get_direction(desc); |
80b0a602 MN |
1352 | spin_lock_irqsave(&gpio_lock, flags); |
1353 | } | |
77c2d792 MW |
1354 | done: |
1355 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1356 | return status; | |
1357 | } | |
1358 | ||
fdeb8e15 LW |
1359 | /* |
1360 | * This descriptor validation needs to be inserted verbatim into each | |
1361 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
1362 | * macro to avoid endless duplication. If the desc is NULL it is an |
1363 | * optional GPIO and calls should just bail out. | |
fdeb8e15 LW |
1364 | */ |
1365 | #define VALIDATE_DESC(desc) do { \ | |
54d77198 LW |
1366 | if (!desc) \ |
1367 | return 0; \ | |
bfbbe44d LW |
1368 | if (IS_ERR(desc)) { \ |
1369 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1370 | return PTR_ERR(desc); \ | |
1371 | } \ | |
54d77198 | 1372 | if (!desc->gdev) { \ |
bfbbe44d | 1373 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1374 | return -EINVAL; \ |
1375 | } \ | |
1376 | if ( !desc->gdev->chip ) { \ | |
1377 | dev_warn(&desc->gdev->dev, \ | |
1378 | "%s: backing chip is gone\n", __func__); \ | |
1379 | return 0; \ | |
1380 | } } while (0) | |
1381 | ||
1382 | #define VALIDATE_DESC_VOID(desc) do { \ | |
54d77198 LW |
1383 | if (!desc) \ |
1384 | return; \ | |
bfbbe44d LW |
1385 | if (IS_ERR(desc)) { \ |
1386 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1387 | return; \ | |
1388 | } \ | |
54d77198 | 1389 | if (!desc->gdev) { \ |
bfbbe44d | 1390 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1391 | return; \ |
1392 | } \ | |
1393 | if (!desc->gdev->chip) { \ | |
1394 | dev_warn(&desc->gdev->dev, \ | |
1395 | "%s: backing chip is gone\n", __func__); \ | |
1396 | return; \ | |
1397 | } } while (0) | |
1398 | ||
1399 | ||
0eb4c6c2 | 1400 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1401 | { |
1402 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1403 | struct gpio_device *gdev; |
77c2d792 | 1404 | |
fdeb8e15 LW |
1405 | VALIDATE_DESC(desc); |
1406 | gdev = desc->gdev; | |
77c2d792 | 1407 | |
fdeb8e15 | 1408 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1409 | status = __gpiod_request(desc, label); |
1410 | if (status < 0) | |
fdeb8e15 | 1411 | module_put(gdev->owner); |
33a68e86 LW |
1412 | else |
1413 | get_device(&gdev->dev); | |
77c2d792 MW |
1414 | } |
1415 | ||
d2876d08 | 1416 | if (status) |
7589e59f | 1417 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 1418 | |
d2876d08 DB |
1419 | return status; |
1420 | } | |
372e722e | 1421 | |
77c2d792 | 1422 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 1423 | { |
77c2d792 | 1424 | bool ret = false; |
d2876d08 | 1425 | unsigned long flags; |
35e8bb51 | 1426 | struct gpio_chip *chip; |
d2876d08 | 1427 | |
3d599d1c UKK |
1428 | might_sleep(); |
1429 | ||
372e722e | 1430 | gpiod_unexport(desc); |
d8f388d8 | 1431 | |
d2876d08 DB |
1432 | spin_lock_irqsave(&gpio_lock, flags); |
1433 | ||
fdeb8e15 | 1434 | chip = desc->gdev->chip; |
35e8bb51 DB |
1435 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
1436 | if (chip->free) { | |
1437 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 1438 | might_sleep_if(chip->can_sleep); |
372e722e | 1439 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1440 | spin_lock_irqsave(&gpio_lock, flags); |
1441 | } | |
d2876d08 | 1442 | desc_set_label(desc, NULL); |
07697461 | 1443 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 1444 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 1445 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 1446 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 1447 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
1448 | ret = true; |
1449 | } | |
d2876d08 DB |
1450 | |
1451 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
1452 | return ret; |
1453 | } | |
1454 | ||
0eb4c6c2 | 1455 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 1456 | { |
33a68e86 | 1457 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 1458 | module_put(desc->gdev->owner); |
33a68e86 LW |
1459 | put_device(&desc->gdev->dev); |
1460 | } else { | |
77c2d792 | 1461 | WARN_ON(extra_checks); |
33a68e86 | 1462 | } |
d2876d08 | 1463 | } |
372e722e | 1464 | |
d2876d08 DB |
1465 | /** |
1466 | * gpiochip_is_requested - return string iff signal was requested | |
1467 | * @chip: controller managing the signal | |
1468 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1469 | * | |
1470 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
1471 | * The string returned is the label passed to gpio_request(); if none has been |
1472 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
1473 | * |
1474 | * This function is for use by GPIO controller drivers. The label can | |
1475 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1476 | * can help avoid accidentally multiplexing it to another controller. | |
1477 | */ | |
1478 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1479 | { | |
6c0b4e6c | 1480 | struct gpio_desc *desc; |
d2876d08 | 1481 | |
48b5953e | 1482 | if (offset >= chip->ngpio) |
d2876d08 | 1483 | return NULL; |
6c0b4e6c | 1484 | |
1c3cdb18 | 1485 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 1486 | |
372e722e | 1487 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1488 | return NULL; |
372e722e | 1489 | return desc->label; |
d2876d08 DB |
1490 | } |
1491 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1492 | ||
77c2d792 MW |
1493 | /** |
1494 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1495 | * @desc: GPIO descriptor to request | |
1496 | * @label: label for the GPIO | |
1497 | * | |
1498 | * Function allows GPIO chip drivers to request and use their own GPIO | |
1499 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
1500 | * function will not increase reference count of the GPIO chip module. This | |
1501 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
1502 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
1503 | */ | |
abdc08a3 AC |
1504 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
1505 | const char *label) | |
77c2d792 | 1506 | { |
abdc08a3 AC |
1507 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
1508 | int err; | |
77c2d792 | 1509 | |
abdc08a3 AC |
1510 | if (IS_ERR(desc)) { |
1511 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
1512 | return desc; | |
1513 | } | |
1514 | ||
1515 | err = __gpiod_request(desc, label); | |
1516 | if (err < 0) | |
1517 | return ERR_PTR(err); | |
77c2d792 | 1518 | |
abdc08a3 | 1519 | return desc; |
77c2d792 | 1520 | } |
f7d4ad98 | 1521 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
1522 | |
1523 | /** | |
1524 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
1525 | * @desc: GPIO descriptor to free | |
1526 | * | |
1527 | * Function frees the given GPIO requested previously with | |
1528 | * gpiochip_request_own_desc(). | |
1529 | */ | |
1530 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
1531 | { | |
1532 | if (desc) | |
1533 | __gpiod_free(desc); | |
1534 | } | |
f7d4ad98 | 1535 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 1536 | |
fdeb8e15 LW |
1537 | /* |
1538 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
1539 | * some cases this is done in early boot, before IRQs are enabled. |
1540 | * | |
1541 | * As a rule these aren't called more than once (except for drivers | |
1542 | * using the open-drain emulation idiom) so these are natural places | |
1543 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1544 | * rely on gpio_request() having been called beforehand. | |
1545 | */ | |
1546 | ||
79a9becd AC |
1547 | /** |
1548 | * gpiod_direction_input - set the GPIO direction to input | |
1549 | * @desc: GPIO to set to input | |
1550 | * | |
1551 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1552 | * be called safely on it. | |
1553 | * | |
1554 | * Return 0 in case of success, else an error code. | |
1555 | */ | |
1556 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 1557 | { |
d2876d08 | 1558 | struct gpio_chip *chip; |
d2876d08 DB |
1559 | int status = -EINVAL; |
1560 | ||
fdeb8e15 LW |
1561 | VALIDATE_DESC(desc); |
1562 | chip = desc->gdev->chip; | |
bcabdef1 | 1563 | |
be1a4b13 | 1564 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
1565 | gpiod_warn(desc, |
1566 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 1567 | __func__); |
be1a4b13 LW |
1568 | return -EIO; |
1569 | } | |
1570 | ||
d82da797 | 1571 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
1572 | if (status == 0) |
1573 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1574 | |
372e722e | 1575 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 1576 | |
d2876d08 DB |
1577 | return status; |
1578 | } | |
79a9becd | 1579 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1580 | |
ef70bbe1 | 1581 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 1582 | { |
c663e5f5 LW |
1583 | struct gpio_chip *gc = desc->gdev->chip; |
1584 | int ret; | |
d2876d08 | 1585 | |
d468bf9e LW |
1586 | /* GPIOs used for IRQs shall not be set as output */ |
1587 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1588 | gpiod_err(desc, | |
1589 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1590 | __func__); | |
1591 | return -EIO; | |
1592 | } | |
1593 | ||
c663e5f5 LW |
1594 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
1595 | /* First see if we can enable open drain in hardware */ | |
1596 | if (gc->set_single_ended) { | |
1597 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
1598 | LINE_MODE_OPEN_DRAIN); | |
1599 | if (!ret) | |
1600 | goto set_output_value; | |
1601 | } | |
1602 | /* Emulate open drain by not actively driving the line high */ | |
1603 | if (value) | |
1604 | return gpiod_direction_input(desc); | |
1605 | } | |
1606 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
1607 | if (gc->set_single_ended) { | |
1608 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
1609 | LINE_MODE_OPEN_SOURCE); | |
1610 | if (!ret) | |
1611 | goto set_output_value; | |
1612 | } | |
1613 | /* Emulate open source by not actively driving the line low */ | |
1614 | if (!value) | |
1615 | return gpiod_direction_input(desc); | |
1616 | } else { | |
1617 | /* Make sure to disable open drain/source hardware, if any */ | |
1618 | if (gc->set_single_ended) | |
1619 | gc->set_single_ended(gc, | |
1620 | gpio_chip_hwgpio(desc), | |
1621 | LINE_MODE_PUSH_PULL); | |
1622 | } | |
25553ff0 | 1623 | |
c663e5f5 LW |
1624 | set_output_value: |
1625 | if (!gc->set || !gc->direction_output) { | |
6424de5a MB |
1626 | gpiod_warn(desc, |
1627 | "%s: missing set() or direction_output() operations\n", | |
1628 | __func__); | |
be1a4b13 LW |
1629 | return -EIO; |
1630 | } | |
1631 | ||
c663e5f5 LW |
1632 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), value); |
1633 | if (!ret) | |
d2876d08 | 1634 | set_bit(FLAG_IS_OUT, &desc->flags); |
372e722e | 1635 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
c663e5f5 LW |
1636 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
1637 | return ret; | |
d2876d08 | 1638 | } |
ef70bbe1 PZ |
1639 | |
1640 | /** | |
1641 | * gpiod_direction_output_raw - set the GPIO direction to output | |
1642 | * @desc: GPIO to set to output | |
1643 | * @value: initial output value of the GPIO | |
1644 | * | |
1645 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1646 | * be called safely on it. The initial value of the output must be specified | |
1647 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
1648 | * | |
1649 | * Return 0 in case of success, else an error code. | |
1650 | */ | |
1651 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
1652 | { | |
fdeb8e15 | 1653 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1654 | return _gpiod_direction_output_raw(desc, value); |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
1657 | ||
1658 | /** | |
90df4fe0 | 1659 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
1660 | * @desc: GPIO to set to output |
1661 | * @value: initial output value of the GPIO | |
1662 | * | |
1663 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1664 | * be called safely on it. The initial value of the output must be specified | |
1665 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1666 | * account. | |
1667 | * | |
1668 | * Return 0 in case of success, else an error code. | |
1669 | */ | |
1670 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
1671 | { | |
fdeb8e15 | 1672 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1673 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1674 | value = !value; | |
1675 | return _gpiod_direction_output_raw(desc, value); | |
1676 | } | |
79a9becd | 1677 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1678 | |
c4b5be98 | 1679 | /** |
79a9becd | 1680 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1681 | * @gpio: the gpio to set debounce time |
1682 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1683 | * |
1684 | * returns -ENOTSUPP if the controller does not support setting | |
1685 | * debounce. | |
c4b5be98 | 1686 | */ |
79a9becd | 1687 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 1688 | { |
c4b5be98 | 1689 | struct gpio_chip *chip; |
c4b5be98 | 1690 | |
fdeb8e15 LW |
1691 | VALIDATE_DESC(desc); |
1692 | chip = desc->gdev->chip; | |
be1a4b13 | 1693 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1694 | gpiod_dbg(desc, |
1695 | "%s: missing set() or set_debounce() operations\n", | |
1696 | __func__); | |
65d87656 | 1697 | return -ENOTSUPP; |
be1a4b13 LW |
1698 | } |
1699 | ||
d82da797 | 1700 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 1701 | } |
79a9becd | 1702 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1703 | |
79a9becd AC |
1704 | /** |
1705 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1706 | * @desc: the gpio descriptor to test | |
1707 | * | |
1708 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1709 | */ | |
1710 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1711 | { |
fdeb8e15 | 1712 | VALIDATE_DESC(desc); |
79a9becd | 1713 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1714 | } |
79a9becd | 1715 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1716 | |
1717 | /* I/O calls are only valid after configuration completed; the relevant | |
1718 | * "is this a valid GPIO" error checks should already have been done. | |
1719 | * | |
1720 | * "Get" operations are often inlinable as reading a pin value register, | |
1721 | * and masking the relevant bit in that register. | |
1722 | * | |
1723 | * When "set" operations are inlinable, they involve writing that mask to | |
1724 | * one register to set a low value, or a different register to set it high. | |
1725 | * Otherwise locking is needed, so there may be little value to inlining. | |
1726 | * | |
1727 | *------------------------------------------------------------------------ | |
1728 | * | |
1729 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1730 | * have requested the GPIO. That can include implicit requesting by | |
1731 | * a direction setting call. Marking a gpio as requested locks its chip | |
1732 | * in memory, guaranteeing that these table lookups need no more locking | |
1733 | * and that gpiochip_remove() will fail. | |
1734 | * | |
1735 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1736 | * that the GPIO was actually requested. | |
1737 | */ | |
1738 | ||
e20538b8 | 1739 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
1740 | { |
1741 | struct gpio_chip *chip; | |
372e722e | 1742 | int offset; |
e20538b8 | 1743 | int value; |
d2876d08 | 1744 | |
fdeb8e15 | 1745 | chip = desc->gdev->chip; |
372e722e | 1746 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 1747 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 1748 | value = value < 0 ? value : !!value; |
372e722e | 1749 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 1750 | return value; |
d2876d08 | 1751 | } |
372e722e | 1752 | |
d2876d08 | 1753 | /** |
79a9becd AC |
1754 | * gpiod_get_raw_value() - return a gpio's raw value |
1755 | * @desc: gpio whose value will be returned | |
d2876d08 | 1756 | * |
79a9becd | 1757 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 1758 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1759 | * |
1760 | * This function should be called from contexts where we cannot sleep, and will | |
1761 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1762 | */ |
79a9becd | 1763 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1764 | { |
fdeb8e15 | 1765 | VALIDATE_DESC(desc); |
e4e449e8 | 1766 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1767 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1768 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1769 | } |
79a9becd | 1770 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1771 | |
79a9becd AC |
1772 | /** |
1773 | * gpiod_get_value() - return a gpio's value | |
1774 | * @desc: gpio whose value will be returned | |
1775 | * | |
1776 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1777 | * account, or negative errno on failure. |
79a9becd AC |
1778 | * |
1779 | * This function should be called from contexts where we cannot sleep, and will | |
1780 | * complain if the GPIO chip functions potentially sleep. | |
1781 | */ | |
1782 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1783 | { |
79a9becd | 1784 | int value; |
fdeb8e15 LW |
1785 | |
1786 | VALIDATE_DESC(desc); | |
79a9becd | 1787 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1788 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1789 | |
1790 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1791 | if (value < 0) |
1792 | return value; | |
1793 | ||
79a9becd AC |
1794 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1795 | value = !value; | |
1796 | ||
1797 | return value; | |
372e722e | 1798 | } |
79a9becd | 1799 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1800 | |
aca5ce14 LD |
1801 | /* |
1802 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1803 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 1804 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 1805 | */ |
23600969 | 1806 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
1807 | { |
1808 | int err = 0; | |
fdeb8e15 | 1809 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1810 | int offset = gpio_chip_hwgpio(desc); |
1811 | ||
aca5ce14 | 1812 | if (value) { |
372e722e | 1813 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1814 | if (!err) |
372e722e | 1815 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1816 | } else { |
372e722e | 1817 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1818 | if (!err) |
372e722e | 1819 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1820 | } |
372e722e | 1821 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1822 | if (err < 0) |
6424de5a MB |
1823 | gpiod_err(desc, |
1824 | "%s: Error in set_value for open drain err %d\n", | |
1825 | __func__, err); | |
aca5ce14 LD |
1826 | } |
1827 | ||
25553ff0 | 1828 | /* |
79a9becd AC |
1829 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1830 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 1831 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 1832 | */ |
23600969 | 1833 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
1834 | { |
1835 | int err = 0; | |
fdeb8e15 | 1836 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1837 | int offset = gpio_chip_hwgpio(desc); |
1838 | ||
25553ff0 | 1839 | if (value) { |
372e722e | 1840 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1841 | if (!err) |
372e722e | 1842 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1843 | } else { |
372e722e | 1844 | err = chip->direction_input(chip, offset); |
25553ff0 | 1845 | if (!err) |
372e722e | 1846 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1847 | } |
372e722e | 1848 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1849 | if (err < 0) |
6424de5a MB |
1850 | gpiod_err(desc, |
1851 | "%s: Error in set_value for open source err %d\n", | |
1852 | __func__, err); | |
25553ff0 LD |
1853 | } |
1854 | ||
23600969 | 1855 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
1856 | { |
1857 | struct gpio_chip *chip; | |
1858 | ||
fdeb8e15 | 1859 | chip = desc->gdev->chip; |
372e722e AC |
1860 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1861 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1862 | _gpio_set_open_drain_value(desc, value); | |
1863 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1864 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 1865 | else |
372e722e AC |
1866 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
1867 | } | |
1868 | ||
5f424243 RI |
1869 | /* |
1870 | * set multiple outputs on the same chip; | |
1871 | * use the chip's set_multiple function if available; | |
1872 | * otherwise set the outputs sequentially; | |
1873 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
1874 | * defines which outputs are to be changed | |
1875 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
1876 | * defines the values the outputs specified by mask are to be set to | |
1877 | */ | |
1878 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
1879 | unsigned long *mask, unsigned long *bits) | |
1880 | { | |
1881 | if (chip->set_multiple) { | |
1882 | chip->set_multiple(chip, mask, bits); | |
1883 | } else { | |
1884 | int i; | |
1885 | for (i = 0; i < chip->ngpio; i++) { | |
1886 | if (mask[BIT_WORD(i)] == 0) { | |
1887 | /* no more set bits in this mask word; | |
1888 | * skip ahead to the next word */ | |
1889 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
1890 | continue; | |
1891 | } | |
1892 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 1893 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 1894 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
1895 | } |
1896 | } | |
1897 | } | |
1898 | ||
44c7288f LW |
1899 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
1900 | unsigned int array_size, | |
1901 | struct gpio_desc **desc_array, | |
1902 | int *value_array) | |
5f424243 RI |
1903 | { |
1904 | int i = 0; | |
1905 | ||
1906 | while (i < array_size) { | |
fdeb8e15 | 1907 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
1908 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
1909 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
1910 | int count = 0; | |
1911 | ||
38e003f4 | 1912 | if (!can_sleep) |
5f424243 | 1913 | WARN_ON(chip->can_sleep); |
38e003f4 | 1914 | |
5f424243 RI |
1915 | memset(mask, 0, sizeof(mask)); |
1916 | do { | |
1917 | struct gpio_desc *desc = desc_array[i]; | |
1918 | int hwgpio = gpio_chip_hwgpio(desc); | |
1919 | int value = value_array[i]; | |
1920 | ||
1921 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1922 | value = !value; | |
1923 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1924 | /* | |
1925 | * collect all normal outputs belonging to the same chip | |
1926 | * open drain and open source outputs are set individually | |
1927 | */ | |
1928 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 1929 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
1930 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
1931 | _gpio_set_open_source_value(desc, value); | |
1932 | } else { | |
1933 | __set_bit(hwgpio, mask); | |
38e003f4 | 1934 | if (value) |
5f424243 | 1935 | __set_bit(hwgpio, bits); |
38e003f4 | 1936 | else |
5f424243 | 1937 | __clear_bit(hwgpio, bits); |
5f424243 RI |
1938 | count++; |
1939 | } | |
1940 | i++; | |
fdeb8e15 LW |
1941 | } while ((i < array_size) && |
1942 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 1943 | /* push collected bits to outputs */ |
38e003f4 | 1944 | if (count != 0) |
5f424243 | 1945 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
1946 | } |
1947 | } | |
1948 | ||
d2876d08 | 1949 | /** |
79a9becd AC |
1950 | * gpiod_set_raw_value() - assign a gpio's raw value |
1951 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1952 | * @value: value to assign |
d2876d08 | 1953 | * |
79a9becd AC |
1954 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1955 | * regard for its ACTIVE_LOW status. | |
1956 | * | |
1957 | * This function should be called from contexts where we cannot sleep, and will | |
1958 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1959 | */ |
79a9becd | 1960 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 1961 | { |
fdeb8e15 | 1962 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 1963 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 1964 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1965 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 1966 | } |
79a9becd | 1967 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
1968 | |
1969 | /** | |
79a9becd AC |
1970 | * gpiod_set_value() - assign a gpio's value |
1971 | * @desc: gpio whose value will be assigned | |
1972 | * @value: value to assign | |
1973 | * | |
1974 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1975 | * account | |
d2876d08 | 1976 | * |
79a9becd AC |
1977 | * This function should be called from contexts where we cannot sleep, and will |
1978 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1979 | */ |
79a9becd | 1980 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 1981 | { |
fdeb8e15 | 1982 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 1983 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 1984 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1985 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1986 | value = !value; | |
1987 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1988 | } |
79a9becd | 1989 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 1990 | |
5f424243 | 1991 | /** |
3fff99bc | 1992 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1993 | * @array_size: number of elements in the descriptor / value arrays |
1994 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1995 | * @value_array: array of values to assign | |
1996 | * | |
1997 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1998 | * without regard for their ACTIVE_LOW status. | |
1999 | * | |
2000 | * This function should be called from contexts where we cannot sleep, and will | |
2001 | * complain if the GPIO chip functions potentially sleep. | |
2002 | */ | |
3fff99bc | 2003 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
2004 | struct gpio_desc **desc_array, int *value_array) |
2005 | { | |
2006 | if (!desc_array) | |
2007 | return; | |
44c7288f LW |
2008 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
2009 | value_array); | |
5f424243 | 2010 | } |
3fff99bc | 2011 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
2012 | |
2013 | /** | |
3fff99bc | 2014 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2015 | * @array_size: number of elements in the descriptor / value arrays |
2016 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2017 | * @value_array: array of values to assign | |
2018 | * | |
2019 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2020 | * into account. | |
2021 | * | |
2022 | * This function should be called from contexts where we cannot sleep, and will | |
2023 | * complain if the GPIO chip functions potentially sleep. | |
2024 | */ | |
3fff99bc RI |
2025 | void gpiod_set_array_value(unsigned int array_size, |
2026 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2027 | { |
2028 | if (!desc_array) | |
2029 | return; | |
44c7288f LW |
2030 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2031 | value_array); | |
5f424243 | 2032 | } |
3fff99bc | 2033 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2034 | |
d2876d08 | 2035 | /** |
79a9becd AC |
2036 | * gpiod_cansleep() - report whether gpio value access may sleep |
2037 | * @desc: gpio to check | |
d2876d08 | 2038 | * |
d2876d08 | 2039 | */ |
79a9becd | 2040 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2041 | { |
fdeb8e15 LW |
2042 | VALIDATE_DESC(desc); |
2043 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2044 | } |
79a9becd | 2045 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2046 | |
0f6d504e | 2047 | /** |
79a9becd AC |
2048 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2049 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2050 | * |
79a9becd AC |
2051 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2052 | * error. | |
0f6d504e | 2053 | */ |
79a9becd | 2054 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2055 | { |
4c37ce86 LW |
2056 | struct gpio_chip *chip; |
2057 | int offset; | |
0f6d504e | 2058 | |
79bb71bd LW |
2059 | /* |
2060 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
2061 | * requires this function to not return zero on an invalid descriptor | |
2062 | * but rather a negative error number. | |
2063 | */ | |
bfbbe44d | 2064 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
2065 | return -EINVAL; |
2066 | ||
fdeb8e15 | 2067 | chip = desc->gdev->chip; |
372e722e | 2068 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
2069 | if (chip->to_irq) { |
2070 | int retirq = chip->to_irq(chip, offset); | |
2071 | ||
2072 | /* Zero means NO_IRQ */ | |
2073 | if (!retirq) | |
2074 | return -ENXIO; | |
2075 | ||
2076 | return retirq; | |
2077 | } | |
2078 | return -ENXIO; | |
0f6d504e | 2079 | } |
79a9becd | 2080 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 2081 | |
d468bf9e | 2082 | /** |
e3a2e878 | 2083 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
2084 | * @chip: the chip the GPIO to lock belongs to |
2085 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2086 | * |
2087 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 2088 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 2089 | */ |
e3a2e878 | 2090 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 2091 | { |
9c10280d LW |
2092 | struct gpio_desc *desc; |
2093 | ||
2094 | desc = gpiochip_get_desc(chip, offset); | |
2095 | if (IS_ERR(desc)) | |
2096 | return PTR_ERR(desc); | |
2097 | ||
2098 | /* Flush direction if something changed behind our back */ | |
2099 | if (chip->get_direction) { | |
2100 | int dir = chip->get_direction(chip, offset); | |
2101 | ||
2102 | if (dir) | |
2103 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
2104 | else | |
2105 | set_bit(FLAG_IS_OUT, &desc->flags); | |
2106 | } | |
d468bf9e | 2107 | |
9c10280d | 2108 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 2109 | chip_err(chip, |
d468bf9e LW |
2110 | "%s: tried to flag a GPIO set as output for IRQ\n", |
2111 | __func__); | |
2112 | return -EIO; | |
2113 | } | |
2114 | ||
9c10280d | 2115 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
d468bf9e | 2116 | return 0; |
372e722e | 2117 | } |
e3a2e878 | 2118 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 2119 | |
d468bf9e | 2120 | /** |
e3a2e878 | 2121 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
2122 | * @chip: the chip the GPIO to lock belongs to |
2123 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2124 | * |
2125 | * This is used directly by GPIO drivers that want to indicate | |
2126 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 2127 | */ |
e3a2e878 | 2128 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 2129 | { |
d74be6df | 2130 | if (offset >= chip->ngpio) |
d468bf9e | 2131 | return; |
d2876d08 | 2132 | |
1c3cdb18 | 2133 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 2134 | } |
e3a2e878 | 2135 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 2136 | |
6cee3821 LW |
2137 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
2138 | { | |
2139 | if (offset >= chip->ngpio) | |
2140 | return false; | |
2141 | ||
2142 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
2143 | } | |
2144 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
2145 | ||
143b65d6 LW |
2146 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
2147 | { | |
2148 | if (offset >= chip->ngpio) | |
2149 | return false; | |
2150 | ||
2151 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
2152 | } | |
2153 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
2154 | ||
2155 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
2156 | { | |
2157 | if (offset >= chip->ngpio) | |
2158 | return false; | |
2159 | ||
2160 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
2161 | } | |
2162 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
2163 | ||
79a9becd AC |
2164 | /** |
2165 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2166 | * @desc: gpio whose value will be returned | |
2167 | * | |
2168 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 2169 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2170 | * |
2171 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2172 | */ |
79a9becd | 2173 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2174 | { |
d2876d08 | 2175 | might_sleep_if(extra_checks); |
fdeb8e15 | 2176 | VALIDATE_DESC(desc); |
79a9becd | 2177 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2178 | } |
79a9becd | 2179 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2180 | |
79a9becd AC |
2181 | /** |
2182 | * gpiod_get_value_cansleep() - return a gpio's value | |
2183 | * @desc: gpio whose value will be returned | |
2184 | * | |
2185 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2186 | * account, or negative errno on failure. |
79a9becd AC |
2187 | * |
2188 | * This function is to be called from contexts that can sleep. | |
2189 | */ | |
2190 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2191 | { |
3f397c21 | 2192 | int value; |
d2876d08 DB |
2193 | |
2194 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2195 | VALIDATE_DESC(desc); |
79a9becd | 2196 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
2197 | if (value < 0) |
2198 | return value; | |
2199 | ||
79a9becd AC |
2200 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2201 | value = !value; | |
2202 | ||
3f397c21 | 2203 | return value; |
d2876d08 | 2204 | } |
79a9becd | 2205 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2206 | |
79a9becd AC |
2207 | /** |
2208 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2209 | * @desc: gpio whose value will be assigned | |
2210 | * @value: value to assign | |
2211 | * | |
2212 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2213 | * regard for its ACTIVE_LOW status. | |
2214 | * | |
2215 | * This function is to be called from contexts that can sleep. | |
2216 | */ | |
2217 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2218 | { |
d2876d08 | 2219 | might_sleep_if(extra_checks); |
fdeb8e15 | 2220 | VALIDATE_DESC_VOID(desc); |
79a9becd | 2221 | _gpiod_set_raw_value(desc, value); |
372e722e | 2222 | } |
79a9becd | 2223 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2224 | |
79a9becd AC |
2225 | /** |
2226 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2227 | * @desc: gpio whose value will be assigned | |
2228 | * @value: value to assign | |
2229 | * | |
2230 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2231 | * account | |
2232 | * | |
2233 | * This function is to be called from contexts that can sleep. | |
2234 | */ | |
2235 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2236 | { |
d2876d08 | 2237 | might_sleep_if(extra_checks); |
fdeb8e15 | 2238 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2239 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2240 | value = !value; | |
2241 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2242 | } |
79a9becd | 2243 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2244 | |
5f424243 | 2245 | /** |
3fff99bc | 2246 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2247 | * @array_size: number of elements in the descriptor / value arrays |
2248 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2249 | * @value_array: array of values to assign | |
2250 | * | |
2251 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2252 | * without regard for their ACTIVE_LOW status. | |
2253 | * | |
2254 | * This function is to be called from contexts that can sleep. | |
2255 | */ | |
3fff99bc RI |
2256 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2257 | struct gpio_desc **desc_array, | |
2258 | int *value_array) | |
5f424243 RI |
2259 | { |
2260 | might_sleep_if(extra_checks); | |
2261 | if (!desc_array) | |
2262 | return; | |
44c7288f LW |
2263 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
2264 | value_array); | |
5f424243 | 2265 | } |
3fff99bc | 2266 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2267 | |
2268 | /** | |
3fff99bc | 2269 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2270 | * @array_size: number of elements in the descriptor / value arrays |
2271 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2272 | * @value_array: array of values to assign | |
2273 | * | |
2274 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2275 | * into account. | |
2276 | * | |
2277 | * This function is to be called from contexts that can sleep. | |
2278 | */ | |
3fff99bc RI |
2279 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2280 | struct gpio_desc **desc_array, | |
2281 | int *value_array) | |
5f424243 RI |
2282 | { |
2283 | might_sleep_if(extra_checks); | |
2284 | if (!desc_array) | |
2285 | return; | |
44c7288f LW |
2286 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
2287 | value_array); | |
5f424243 | 2288 | } |
3fff99bc | 2289 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2290 | |
bae48da2 | 2291 | /** |
ad824783 AC |
2292 | * gpiod_add_lookup_table() - register GPIO device consumers |
2293 | * @table: table of consumers to register | |
bae48da2 | 2294 | */ |
ad824783 | 2295 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2296 | { |
2297 | mutex_lock(&gpio_lookup_lock); | |
2298 | ||
ad824783 | 2299 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2300 | |
2301 | mutex_unlock(&gpio_lookup_lock); | |
2302 | } | |
2303 | ||
be9015ab SK |
2304 | /** |
2305 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2306 | * @table: table of consumers to unregister | |
2307 | */ | |
2308 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2309 | { | |
2310 | mutex_lock(&gpio_lookup_lock); | |
2311 | ||
2312 | list_del(&table->list); | |
2313 | ||
2314 | mutex_unlock(&gpio_lookup_lock); | |
2315 | } | |
2316 | ||
bae48da2 | 2317 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2318 | unsigned int idx, |
2319 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
2320 | { |
2321 | char prop_name[32]; /* 32 is max size of property name */ | |
2322 | enum of_gpio_flags of_flags; | |
2323 | struct gpio_desc *desc; | |
dd34c37a | 2324 | unsigned int i; |
bae48da2 | 2325 | |
7f2e553a | 2326 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 2327 | if (con_id) |
9e089246 | 2328 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 2329 | gpio_suffixes[i]); |
dd34c37a | 2330 | else |
9e089246 | 2331 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 2332 | gpio_suffixes[i]); |
bae48da2 | 2333 | |
dd34c37a TR |
2334 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
2335 | &of_flags); | |
06fc3b70 | 2336 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) |
dd34c37a TR |
2337 | break; |
2338 | } | |
bae48da2 AC |
2339 | |
2340 | if (IS_ERR(desc)) | |
2341 | return desc; | |
2342 | ||
2343 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 2344 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 | 2345 | |
90b665f6 LP |
2346 | if (of_flags & OF_GPIO_SINGLE_ENDED) { |
2347 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
2348 | *flags |= GPIO_OPEN_DRAIN; | |
2349 | else | |
2350 | *flags |= GPIO_OPEN_SOURCE; | |
2351 | } | |
2352 | ||
bae48da2 AC |
2353 | return desc; |
2354 | } | |
d2876d08 | 2355 | |
25487533 DT |
2356 | static struct gpio_desc *acpi_find_gpio(struct device *dev, |
2357 | const char *con_id, | |
53e7cac3 | 2358 | unsigned int idx, |
25487533 DT |
2359 | enum gpiod_flags flags, |
2360 | enum gpio_lookup_flags *lookupflags) | |
372e722e | 2361 | { |
0d9a693c | 2362 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
2363 | struct acpi_gpio_info info; |
2364 | struct gpio_desc *desc; | |
0d9a693c MW |
2365 | char propname[32]; |
2366 | int i; | |
e01f440a | 2367 | |
0d9a693c | 2368 | /* Try first from _DSD */ |
7f2e553a | 2369 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
2370 | if (con_id && strcmp(con_id, "gpios")) { |
2371 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 2372 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
2373 | } else { |
2374 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 2375 | gpio_suffixes[i]); |
0d9a693c MW |
2376 | } |
2377 | ||
2378 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
2379 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
2380 | break; | |
2381 | } | |
2382 | ||
2383 | /* Then from plain _CRS GPIOs */ | |
2384 | if (IS_ERR(desc)) { | |
10cf4899 DT |
2385 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
2386 | return ERR_PTR(-ENOENT); | |
2387 | ||
0d9a693c MW |
2388 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); |
2389 | if (IS_ERR(desc)) | |
2390 | return desc; | |
25487533 DT |
2391 | |
2392 | if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) && | |
2393 | info.gpioint) { | |
2394 | dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); | |
2395 | return ERR_PTR(-ENOENT); | |
2396 | } | |
0d9a693c | 2397 | } |
e01f440a | 2398 | |
52044723 | 2399 | if (info.polarity == GPIO_ACTIVE_LOW) |
25487533 | 2400 | *lookupflags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
2401 | |
2402 | return desc; | |
81f59e9d MW |
2403 | } |
2404 | ||
ad824783 | 2405 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2406 | { |
2407 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2408 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2409 | |
2410 | mutex_lock(&gpio_lookup_lock); | |
2411 | ||
ad824783 AC |
2412 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2413 | if (table->dev_id && dev_id) { | |
2414 | /* | |
2415 | * Valid strings on both ends, must be identical to have | |
2416 | * a match | |
2417 | */ | |
2418 | if (!strcmp(table->dev_id, dev_id)) | |
2419 | goto found; | |
2420 | } else { | |
2421 | /* | |
2422 | * One of the pointers is NULL, so both must be to have | |
2423 | * a match | |
2424 | */ | |
2425 | if (dev_id == table->dev_id) | |
2426 | goto found; | |
2427 | } | |
2428 | } | |
2429 | table = NULL; | |
bae48da2 | 2430 | |
ad824783 AC |
2431 | found: |
2432 | mutex_unlock(&gpio_lookup_lock); | |
2433 | return table; | |
2434 | } | |
bae48da2 | 2435 | |
ad824783 AC |
2436 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2437 | unsigned int idx, | |
2438 | enum gpio_lookup_flags *flags) | |
2439 | { | |
2a3cf6a3 | 2440 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2441 | struct gpiod_lookup_table *table; |
2442 | struct gpiod_lookup *p; | |
bae48da2 | 2443 | |
ad824783 AC |
2444 | table = gpiod_find_lookup_table(dev); |
2445 | if (!table) | |
2446 | return desc; | |
bae48da2 | 2447 | |
ad824783 AC |
2448 | for (p = &table->table[0]; p->chip_label; p++) { |
2449 | struct gpio_chip *chip; | |
bae48da2 | 2450 | |
ad824783 | 2451 | /* idx must always match exactly */ |
bae48da2 AC |
2452 | if (p->idx != idx) |
2453 | continue; | |
2454 | ||
ad824783 AC |
2455 | /* If the lookup entry has a con_id, require exact match */ |
2456 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2457 | continue; | |
bae48da2 | 2458 | |
ad824783 | 2459 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2460 | |
ad824783 | 2461 | if (!chip) { |
2a3cf6a3 AC |
2462 | dev_err(dev, "cannot find GPIO chip %s\n", |
2463 | p->chip_label); | |
2464 | return ERR_PTR(-ENODEV); | |
ad824783 | 2465 | } |
bae48da2 | 2466 | |
ad824783 | 2467 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2468 | dev_err(dev, |
2469 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2470 | idx, chip->ngpio, chip->label); | |
2471 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2472 | } |
bae48da2 | 2473 | |
bb1e88cc | 2474 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2475 | *flags = p->flags; |
bae48da2 | 2476 | |
2a3cf6a3 | 2477 | return desc; |
bae48da2 AC |
2478 | } |
2479 | ||
bae48da2 AC |
2480 | return desc; |
2481 | } | |
2482 | ||
66858527 RI |
2483 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2484 | { | |
2485 | int ret; | |
2486 | char propname[32]; | |
2487 | unsigned int i; | |
2488 | ||
2489 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2490 | if (con_id) | |
2491 | snprintf(propname, sizeof(propname), "%s-%s", | |
2492 | con_id, gpio_suffixes[i]); | |
2493 | else | |
2494 | snprintf(propname, sizeof(propname), "%s", | |
2495 | gpio_suffixes[i]); | |
2496 | ||
2497 | ret = of_gpio_named_count(dev->of_node, propname); | |
2498 | if (ret >= 0) | |
2499 | break; | |
2500 | } | |
2501 | return ret; | |
2502 | } | |
2503 | ||
2504 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
2505 | { | |
2506 | struct gpiod_lookup_table *table; | |
2507 | struct gpiod_lookup *p; | |
2508 | unsigned int count = 0; | |
2509 | ||
2510 | table = gpiod_find_lookup_table(dev); | |
2511 | if (!table) | |
2512 | return -ENOENT; | |
2513 | ||
2514 | for (p = &table->table[0]; p->chip_label; p++) { | |
2515 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
2516 | (!con_id && !p->con_id)) | |
2517 | count++; | |
2518 | } | |
2519 | if (!count) | |
2520 | return -ENOENT; | |
2521 | ||
2522 | return count; | |
2523 | } | |
2524 | ||
2525 | /** | |
2526 | * gpiod_count - return the number of GPIOs associated with a device / function | |
2527 | * or -ENOENT if no GPIO has been assigned to the requested function | |
2528 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2529 | * @con_id: function within the GPIO consumer | |
2530 | */ | |
2531 | int gpiod_count(struct device *dev, const char *con_id) | |
2532 | { | |
2533 | int count = -ENOENT; | |
2534 | ||
2535 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
2536 | count = dt_gpio_count(dev, con_id); | |
2537 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
2538 | count = acpi_gpio_count(dev, con_id); | |
2539 | ||
2540 | if (count < 0) | |
2541 | count = platform_gpio_count(dev, con_id); | |
2542 | ||
2543 | return count; | |
2544 | } | |
2545 | EXPORT_SYMBOL_GPL(gpiod_count); | |
2546 | ||
bae48da2 | 2547 | /** |
0879162f | 2548 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 2549 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 2550 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 2551 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2552 | * |
2553 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 2554 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 2555 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 2556 | */ |
b17d1bf1 | 2557 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 2558 | enum gpiod_flags flags) |
bae48da2 | 2559 | { |
39b2bbe3 | 2560 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 2561 | } |
b17d1bf1 | 2562 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 2563 | |
29a1f233 TR |
2564 | /** |
2565 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
2566 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2567 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 2568 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2569 | * |
2570 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
2571 | * the requested function it will return NULL. This is convenient for drivers | |
2572 | * that need to handle optional GPIOs. | |
2573 | */ | |
b17d1bf1 | 2574 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
2575 | const char *con_id, |
2576 | enum gpiod_flags flags) | |
29a1f233 | 2577 | { |
39b2bbe3 | 2578 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 2579 | } |
b17d1bf1 | 2580 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 2581 | |
f625d460 BP |
2582 | |
2583 | /** | |
2584 | * gpiod_configure_flags - helper function to configure a given GPIO | |
2585 | * @desc: gpio whose value will be assigned | |
2586 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
2587 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
2588 | * of_get_gpio_hog() | |
f625d460 BP |
2589 | * @dflags: gpiod_flags - optional GPIO initialization flags |
2590 | * | |
2591 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
2592 | * requested function and/or index, or another IS_ERR() code if an error | |
2593 | * occurred while trying to acquire the GPIO. | |
2594 | */ | |
2595 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
85b03b30 | 2596 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
2597 | { |
2598 | int status; | |
2599 | ||
85b03b30 JH |
2600 | if (lflags & GPIO_ACTIVE_LOW) |
2601 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2602 | if (lflags & GPIO_OPEN_DRAIN) | |
2603 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2604 | if (lflags & GPIO_OPEN_SOURCE) | |
2605 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2606 | ||
f625d460 BP |
2607 | /* No particular flag request, return here... */ |
2608 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
2609 | pr_debug("no flags found for %s\n", con_id); | |
2610 | return 0; | |
2611 | } | |
2612 | ||
2613 | /* Process flags */ | |
2614 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
2615 | status = gpiod_direction_output(desc, | |
2616 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
2617 | else | |
2618 | status = gpiod_direction_input(desc); | |
2619 | ||
2620 | return status; | |
2621 | } | |
2622 | ||
bae48da2 AC |
2623 | /** |
2624 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 2625 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
2626 | * @con_id: function within the GPIO consumer |
2627 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2628 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2629 | * |
2630 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2631 | * defined one for functions that define several GPIOs. | |
2632 | * | |
2a3cf6a3 AC |
2633 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
2634 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 2635 | * occurred while trying to acquire the GPIO. |
bae48da2 | 2636 | */ |
b17d1bf1 | 2637 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 2638 | const char *con_id, |
39b2bbe3 AC |
2639 | unsigned int idx, |
2640 | enum gpiod_flags flags) | |
bae48da2 | 2641 | { |
35c5d7fd | 2642 | struct gpio_desc *desc = NULL; |
bae48da2 | 2643 | int status; |
39b2bbe3 | 2644 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
2645 | |
2646 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2647 | ||
4d8440b9 RW |
2648 | if (dev) { |
2649 | /* Using device tree? */ | |
2650 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
2651 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2652 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
2653 | } else if (ACPI_COMPANION(dev)) { | |
2654 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
25487533 | 2655 | desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); |
4d8440b9 | 2656 | } |
35c5d7fd AC |
2657 | } |
2658 | ||
2659 | /* | |
2660 | * Either we are not using DT or ACPI, or their lookup did not return | |
2661 | * a result. In that case, use platform lookup as a fallback. | |
2662 | */ | |
2a3cf6a3 | 2663 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 2664 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 2665 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
2666 | } |
2667 | ||
2668 | if (IS_ERR(desc)) { | |
351cfe0f | 2669 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
2670 | return desc; |
2671 | } | |
2672 | ||
2673 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
2674 | if (status < 0) |
2675 | return ERR_PTR(status); | |
2676 | ||
85b03b30 | 2677 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
2678 | if (status < 0) { |
2679 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
2680 | gpiod_put(desc); | |
2681 | return ERR_PTR(status); | |
2682 | } | |
2683 | ||
bae48da2 AC |
2684 | return desc; |
2685 | } | |
b17d1bf1 | 2686 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 2687 | |
40b73183 MW |
2688 | /** |
2689 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
2690 | * @fwnode: handle of the firmware node | |
2691 | * @propname: name of the firmware property representing the GPIO | |
2692 | * | |
2693 | * This function can be used for drivers that get their configuration | |
2694 | * from firmware. | |
2695 | * | |
2696 | * Function properly finds the corresponding GPIO using whatever is the | |
2697 | * underlying firmware interface and then makes sure that the GPIO | |
2698 | * descriptor is requested before it is returned to the caller. | |
2699 | * | |
2700 | * In case of error an ERR_PTR() is returned. | |
2701 | */ | |
2702 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
2703 | const char *propname) | |
2704 | { | |
2705 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2706 | bool active_low = false; | |
90b665f6 | 2707 | bool single_ended = false; |
40b73183 MW |
2708 | int ret; |
2709 | ||
2710 | if (!fwnode) | |
2711 | return ERR_PTR(-EINVAL); | |
2712 | ||
2713 | if (is_of_node(fwnode)) { | |
2714 | enum of_gpio_flags flags; | |
2715 | ||
c181fb3e | 2716 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 2717 | &flags); |
90b665f6 | 2718 | if (!IS_ERR(desc)) { |
40b73183 | 2719 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
2720 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
2721 | } | |
40b73183 MW |
2722 | } else if (is_acpi_node(fwnode)) { |
2723 | struct acpi_gpio_info info; | |
2724 | ||
504a3374 | 2725 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 2726 | if (!IS_ERR(desc)) |
52044723 | 2727 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
2728 | } |
2729 | ||
2730 | if (IS_ERR(desc)) | |
2731 | return desc; | |
2732 | ||
85b03b30 JH |
2733 | ret = gpiod_request(desc, NULL); |
2734 | if (ret) | |
2735 | return ERR_PTR(ret); | |
2736 | ||
40b73183 MW |
2737 | if (active_low) |
2738 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2739 | ||
90b665f6 LP |
2740 | if (single_ended) { |
2741 | if (active_low) | |
2742 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2743 | else | |
2744 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2745 | } | |
2746 | ||
40b73183 MW |
2747 | return desc; |
2748 | } | |
2749 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
2750 | ||
29a1f233 TR |
2751 | /** |
2752 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
2753 | * function | |
2754 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2755 | * @con_id: function within the GPIO consumer | |
2756 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2757 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2758 | * |
2759 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
2760 | * specified index was assigned to the requested function it will return NULL. | |
2761 | * This is convenient for drivers that need to handle optional GPIOs. | |
2762 | */ | |
b17d1bf1 | 2763 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 2764 | const char *con_id, |
39b2bbe3 AC |
2765 | unsigned int index, |
2766 | enum gpiod_flags flags) | |
29a1f233 TR |
2767 | { |
2768 | struct gpio_desc *desc; | |
2769 | ||
39b2bbe3 | 2770 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
2771 | if (IS_ERR(desc)) { |
2772 | if (PTR_ERR(desc) == -ENOENT) | |
2773 | return NULL; | |
2774 | } | |
2775 | ||
2776 | return desc; | |
2777 | } | |
b17d1bf1 | 2778 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 2779 | |
f625d460 BP |
2780 | /** |
2781 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
2782 | * @desc: gpio whose value will be assigned | |
2783 | * @name: gpio line name | |
2784 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2785 | * of_get_gpio_hog() | |
2786 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2787 | */ | |
2788 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
2789 | unsigned long lflags, enum gpiod_flags dflags) | |
2790 | { | |
2791 | struct gpio_chip *chip; | |
2792 | struct gpio_desc *local_desc; | |
2793 | int hwnum; | |
2794 | int status; | |
2795 | ||
2796 | chip = gpiod_to_chip(desc); | |
2797 | hwnum = gpio_chip_hwgpio(desc); | |
2798 | ||
2799 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
2800 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
2801 | status = PTR_ERR(local_desc); |
2802 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
2803 | name, chip->label, hwnum, status); | |
2804 | return status; | |
f625d460 BP |
2805 | } |
2806 | ||
85b03b30 | 2807 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 2808 | if (status < 0) { |
c31a571d LD |
2809 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
2810 | name, chip->label, hwnum, status); | |
f625d460 BP |
2811 | gpiochip_free_own_desc(desc); |
2812 | return status; | |
2813 | } | |
2814 | ||
2815 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
2816 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
2817 | ||
2818 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
2819 | desc_to_gpio(desc), name, | |
2820 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
2821 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
2822 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
2823 | ||
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | /** | |
2828 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
2829 | * @chip: gpio chip to act on | |
2830 | * | |
2831 | * This is only used by of_gpiochip_remove to free hogged gpios | |
2832 | */ | |
2833 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
2834 | { | |
2835 | int id; | |
2836 | ||
2837 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
2838 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
2839 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
2840 | } |
2841 | } | |
2842 | ||
66858527 RI |
2843 | /** |
2844 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
2845 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2846 | * @con_id: function within the GPIO consumer | |
2847 | * @flags: optional GPIO initialization flags | |
2848 | * | |
2849 | * This function acquires all the GPIOs defined under a given function. | |
2850 | * | |
2851 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
2852 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
2853 | * code if an error occurred while trying to acquire the GPIOs. | |
2854 | */ | |
2855 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
2856 | const char *con_id, | |
2857 | enum gpiod_flags flags) | |
2858 | { | |
2859 | struct gpio_desc *desc; | |
2860 | struct gpio_descs *descs; | |
2861 | int count; | |
2862 | ||
2863 | count = gpiod_count(dev, con_id); | |
2864 | if (count < 0) | |
2865 | return ERR_PTR(count); | |
2866 | ||
2867 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
2868 | GFP_KERNEL); | |
2869 | if (!descs) | |
2870 | return ERR_PTR(-ENOMEM); | |
2871 | ||
2872 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
2873 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
2874 | if (IS_ERR(desc)) { | |
2875 | gpiod_put_array(descs); | |
2876 | return ERR_CAST(desc); | |
2877 | } | |
2878 | descs->desc[descs->ndescs] = desc; | |
2879 | descs->ndescs++; | |
2880 | } | |
2881 | return descs; | |
2882 | } | |
2883 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
2884 | ||
2885 | /** | |
2886 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
2887 | * function | |
2888 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2889 | * @con_id: function within the GPIO consumer | |
2890 | * @flags: optional GPIO initialization flags | |
2891 | * | |
2892 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
2893 | * assigned to the requested function it will return NULL. | |
2894 | */ | |
2895 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
2896 | const char *con_id, | |
2897 | enum gpiod_flags flags) | |
2898 | { | |
2899 | struct gpio_descs *descs; | |
2900 | ||
2901 | descs = gpiod_get_array(dev, con_id, flags); | |
2902 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
2903 | return NULL; | |
2904 | ||
2905 | return descs; | |
2906 | } | |
2907 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
2908 | ||
bae48da2 AC |
2909 | /** |
2910 | * gpiod_put - dispose of a GPIO descriptor | |
2911 | * @desc: GPIO descriptor to dispose of | |
2912 | * | |
2913 | * No descriptor can be used after gpiod_put() has been called on it. | |
2914 | */ | |
2915 | void gpiod_put(struct gpio_desc *desc) | |
2916 | { | |
2917 | gpiod_free(desc); | |
372e722e | 2918 | } |
bae48da2 | 2919 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 2920 | |
66858527 RI |
2921 | /** |
2922 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
2923 | * @descs: struct gpio_descs containing an array of descriptors | |
2924 | */ | |
2925 | void gpiod_put_array(struct gpio_descs *descs) | |
2926 | { | |
2927 | unsigned int i; | |
2928 | ||
2929 | for (i = 0; i < descs->ndescs; i++) | |
2930 | gpiod_put(descs->desc[i]); | |
2931 | ||
2932 | kfree(descs); | |
2933 | } | |
2934 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
2935 | ||
3c702e99 LW |
2936 | static int __init gpiolib_dev_init(void) |
2937 | { | |
2938 | int ret; | |
2939 | ||
2940 | /* Register GPIO sysfs bus */ | |
2941 | ret = bus_register(&gpio_bus_type); | |
2942 | if (ret < 0) { | |
2943 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
2944 | return ret; | |
2945 | } | |
2946 | ||
2947 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
2948 | if (ret < 0) { | |
2949 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
2950 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
2951 | } else { |
2952 | gpiolib_initialized = true; | |
2953 | gpiochip_setup_devs(); | |
3c702e99 LW |
2954 | } |
2955 | return ret; | |
2956 | } | |
2957 | core_initcall(gpiolib_dev_init); | |
2958 | ||
d2876d08 DB |
2959 | #ifdef CONFIG_DEBUG_FS |
2960 | ||
fdeb8e15 | 2961 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
2962 | { |
2963 | unsigned i; | |
fdeb8e15 LW |
2964 | struct gpio_chip *chip = gdev->chip; |
2965 | unsigned gpio = gdev->base; | |
2966 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 2967 | int is_out; |
d468bf9e | 2968 | int is_irq; |
d2876d08 | 2969 | |
fdeb8e15 | 2970 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
2971 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
2972 | if (gdesc->name) { | |
2973 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
2974 | gpio, gdesc->name); | |
2975 | } | |
d2876d08 | 2976 | continue; |
ced433e2 | 2977 | } |
d2876d08 | 2978 | |
372e722e | 2979 | gpiod_get_direction(gdesc); |
d2876d08 | 2980 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 2981 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
2982 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
2983 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
2984 | is_out ? "out" : "in ", |
2985 | chip->get | |
2986 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2987 | : "? ", |
2988 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2989 | seq_printf(s, "\n"); |
2990 | } | |
2991 | } | |
2992 | ||
f9c4a31f | 2993 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2994 | { |
362432ae | 2995 | unsigned long flags; |
ff2b1359 | 2996 | struct gpio_device *gdev = NULL; |
cb1650d4 | 2997 | loff_t index = *pos; |
d2876d08 | 2998 | |
f9c4a31f | 2999 | s->private = ""; |
d2876d08 | 3000 | |
362432ae | 3001 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3002 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
3003 | if (index-- == 0) { |
3004 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 3005 | return gdev; |
f9c4a31f | 3006 | } |
362432ae | 3007 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 3008 | |
cb1650d4 | 3009 | return NULL; |
f9c4a31f TR |
3010 | } |
3011 | ||
3012 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
3013 | { | |
362432ae | 3014 | unsigned long flags; |
ff2b1359 | 3015 | struct gpio_device *gdev = v; |
f9c4a31f TR |
3016 | void *ret = NULL; |
3017 | ||
362432ae | 3018 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3019 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
3020 | ret = NULL; |
3021 | else | |
ff2b1359 | 3022 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 3023 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3024 | |
3025 | s->private = "\n"; | |
3026 | ++*pos; | |
3027 | ||
3028 | return ret; | |
3029 | } | |
3030 | ||
3031 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
3032 | { | |
3033 | } | |
3034 | ||
3035 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
3036 | { | |
ff2b1359 LW |
3037 | struct gpio_device *gdev = v; |
3038 | struct gpio_chip *chip = gdev->chip; | |
3039 | struct device *parent; | |
3040 | ||
3041 | if (!chip) { | |
3042 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
3043 | dev_name(&gdev->dev)); | |
3044 | return 0; | |
3045 | } | |
f9c4a31f | 3046 | |
ff2b1359 LW |
3047 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
3048 | dev_name(&gdev->dev), | |
fdeb8e15 | 3049 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
3050 | parent = chip->parent; |
3051 | if (parent) | |
3052 | seq_printf(s, ", parent: %s/%s", | |
3053 | parent->bus ? parent->bus->name : "no-bus", | |
3054 | dev_name(parent)); | |
f9c4a31f TR |
3055 | if (chip->label) |
3056 | seq_printf(s, ", %s", chip->label); | |
3057 | if (chip->can_sleep) | |
3058 | seq_printf(s, ", can sleep"); | |
3059 | seq_printf(s, ":\n"); | |
3060 | ||
3061 | if (chip->dbg_show) | |
3062 | chip->dbg_show(s, chip); | |
3063 | else | |
fdeb8e15 | 3064 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 3065 | |
d2876d08 DB |
3066 | return 0; |
3067 | } | |
3068 | ||
f9c4a31f TR |
3069 | static const struct seq_operations gpiolib_seq_ops = { |
3070 | .start = gpiolib_seq_start, | |
3071 | .next = gpiolib_seq_next, | |
3072 | .stop = gpiolib_seq_stop, | |
3073 | .show = gpiolib_seq_show, | |
3074 | }; | |
3075 | ||
d2876d08 DB |
3076 | static int gpiolib_open(struct inode *inode, struct file *file) |
3077 | { | |
f9c4a31f | 3078 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
3079 | } |
3080 | ||
828c0950 | 3081 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 3082 | .owner = THIS_MODULE, |
d2876d08 DB |
3083 | .open = gpiolib_open, |
3084 | .read = seq_read, | |
3085 | .llseek = seq_lseek, | |
f9c4a31f | 3086 | .release = seq_release, |
d2876d08 DB |
3087 | }; |
3088 | ||
3089 | static int __init gpiolib_debugfs_init(void) | |
3090 | { | |
3091 | /* /sys/kernel/debug/gpio */ | |
3092 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
3093 | NULL, NULL, &gpiolib_operations); | |
3094 | return 0; | |
3095 | } | |
3096 | subsys_initcall(gpiolib_debugfs_init); | |
3097 | ||
3098 | #endif /* DEBUG_FS */ |