Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / gpio / gpiolib-devres.c
blob4a517e5dedf0ae4aaecbaf10ce8c8077b058fd24
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * devres.c - managed gpio resources
4 * This file is based on kernel/irq/devres.c
6 * Copyright (c) 2011 John Crispin <john@phrozen.org>
7 */
9 #include <linux/module.h>
10 #include <linux/err.h>
11 #include <linux/gpio.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/device.h>
14 #include <linux/gfp.h>
16 #include "gpiolib.h"
18 static void devm_gpiod_release(struct device *dev, void *res)
20 struct gpio_desc **desc = res;
22 gpiod_put(*desc);
25 static int devm_gpiod_match(struct device *dev, void *res, void *data)
27 struct gpio_desc **this = res, **gpio = data;
29 return *this == *gpio;
32 static void devm_gpiod_release_array(struct device *dev, void *res)
34 struct gpio_descs **descs = res;
36 gpiod_put_array(*descs);
39 static int devm_gpiod_match_array(struct device *dev, void *res, void *data)
41 struct gpio_descs **this = res, **gpios = data;
43 return *this == *gpios;
46 /**
47 * devm_gpiod_get - Resource-managed gpiod_get()
48 * @dev: GPIO consumer
49 * @con_id: function within the GPIO consumer
50 * @flags: optional GPIO initialization flags
52 * Managed gpiod_get(). GPIO descriptors returned from this function are
53 * automatically disposed on driver detach. See gpiod_get() for detailed
54 * information about behavior and return values.
56 struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
57 const char *con_id,
58 enum gpiod_flags flags)
60 return devm_gpiod_get_index(dev, con_id, 0, flags);
62 EXPORT_SYMBOL_GPL(devm_gpiod_get);
64 /**
65 * devm_gpiod_get_optional - Resource-managed gpiod_get_optional()
66 * @dev: GPIO consumer
67 * @con_id: function within the GPIO consumer
68 * @flags: optional GPIO initialization flags
70 * Managed gpiod_get_optional(). GPIO descriptors returned from this function
71 * are automatically disposed on driver detach. See gpiod_get_optional() for
72 * detailed information about behavior and return values.
74 struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
75 const char *con_id,
76 enum gpiod_flags flags)
78 return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
80 EXPORT_SYMBOL_GPL(devm_gpiod_get_optional);
82 /**
83 * devm_gpiod_get_index - Resource-managed gpiod_get_index()
84 * @dev: GPIO consumer
85 * @con_id: function within the GPIO consumer
86 * @idx: index of the GPIO to obtain in the consumer
87 * @flags: optional GPIO initialization flags
89 * Managed gpiod_get_index(). GPIO descriptors returned from this function are
90 * automatically disposed on driver detach. See gpiod_get_index() for detailed
91 * information about behavior and return values.
93 struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
94 const char *con_id,
95 unsigned int idx,
96 enum gpiod_flags flags)
98 struct gpio_desc **dr;
99 struct gpio_desc *desc;
101 desc = gpiod_get_index(dev, con_id, idx, flags);
102 if (IS_ERR(desc))
103 return desc;
106 * For non-exclusive GPIO descriptors, check if this descriptor is
107 * already under resource management by this device.
109 if (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
110 struct devres *dres;
112 dres = devres_find(dev, devm_gpiod_release,
113 devm_gpiod_match, &desc);
114 if (dres)
115 return desc;
118 dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
119 GFP_KERNEL);
120 if (!dr) {
121 gpiod_put(desc);
122 return ERR_PTR(-ENOMEM);
125 *dr = desc;
126 devres_add(dev, dr);
128 return desc;
130 EXPORT_SYMBOL_GPL(devm_gpiod_get_index);
133 * devm_gpiod_get_from_of_node() - obtain a GPIO from an OF node
134 * @dev: device for lifecycle management
135 * @node: handle of the OF node
136 * @propname: name of the DT property representing the GPIO
137 * @index: index of the GPIO to obtain for the consumer
138 * @dflags: GPIO initialization flags
139 * @label: label to attach to the requested GPIO
141 * Returns:
142 * On successful request the GPIO pin is configured in accordance with
143 * provided @dflags.
145 * In case of error an ERR_PTR() is returned.
147 struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
148 struct device_node *node,
149 const char *propname, int index,
150 enum gpiod_flags dflags,
151 const char *label)
153 struct gpio_desc **dr;
154 struct gpio_desc *desc;
156 desc = gpiod_get_from_of_node(node, propname, index, dflags, label);
157 if (IS_ERR(desc))
158 return desc;
161 * For non-exclusive GPIO descriptors, check if this descriptor is
162 * already under resource management by this device.
164 if (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
165 struct devres *dres;
167 dres = devres_find(dev, devm_gpiod_release,
168 devm_gpiod_match, &desc);
169 if (dres)
170 return desc;
173 dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
174 GFP_KERNEL);
175 if (!dr) {
176 gpiod_put(desc);
177 return ERR_PTR(-ENOMEM);
180 *dr = desc;
181 devres_add(dev, dr);
183 return desc;
185 EXPORT_SYMBOL_GPL(devm_gpiod_get_from_of_node);
188 * devm_fwnode_gpiod_get_index - get a GPIO descriptor from a given node
189 * @dev: GPIO consumer
190 * @fwnode: firmware node containing GPIO reference
191 * @con_id: function within the GPIO consumer
192 * @index: index of the GPIO to obtain in the consumer
193 * @flags: GPIO initialization flags
194 * @label: label to attach to the requested GPIO
196 * GPIO descriptors returned from this function are automatically disposed on
197 * driver detach.
199 * On successful request the GPIO pin is configured in accordance with
200 * provided @flags.
202 struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
203 struct fwnode_handle *fwnode,
204 const char *con_id, int index,
205 enum gpiod_flags flags,
206 const char *label)
208 struct gpio_desc **dr;
209 struct gpio_desc *desc;
211 dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
212 GFP_KERNEL);
213 if (!dr)
214 return ERR_PTR(-ENOMEM);
216 desc = fwnode_gpiod_get_index(fwnode, con_id, index, flags, label);
217 if (IS_ERR(desc)) {
218 devres_free(dr);
219 return desc;
222 *dr = desc;
223 devres_add(dev, dr);
225 return desc;
227 EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_index);
230 * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
231 * @dev: GPIO consumer
232 * @con_id: function within the GPIO consumer
233 * @index: index of the GPIO to obtain in the consumer
234 * @flags: optional GPIO initialization flags
236 * Managed gpiod_get_index_optional(). GPIO descriptors returned from this
237 * function are automatically disposed on driver detach. See
238 * gpiod_get_index_optional() for detailed information about behavior and
239 * return values.
241 struct gpio_desc *__must_check devm_gpiod_get_index_optional(struct device *dev,
242 const char *con_id,
243 unsigned int index,
244 enum gpiod_flags flags)
246 struct gpio_desc *desc;
248 desc = devm_gpiod_get_index(dev, con_id, index, flags);
249 if (gpiod_not_found(desc))
250 return NULL;
252 return desc;
254 EXPORT_SYMBOL_GPL(devm_gpiod_get_index_optional);
257 * devm_gpiod_get_array - Resource-managed gpiod_get_array()
258 * @dev: GPIO consumer
259 * @con_id: function within the GPIO consumer
260 * @flags: optional GPIO initialization flags
262 * Managed gpiod_get_array(). GPIO descriptors returned from this function are
263 * automatically disposed on driver detach. See gpiod_get_array() for detailed
264 * information about behavior and return values.
266 struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
267 const char *con_id,
268 enum gpiod_flags flags)
270 struct gpio_descs **dr;
271 struct gpio_descs *descs;
273 dr = devres_alloc(devm_gpiod_release_array,
274 sizeof(struct gpio_descs *), GFP_KERNEL);
275 if (!dr)
276 return ERR_PTR(-ENOMEM);
278 descs = gpiod_get_array(dev, con_id, flags);
279 if (IS_ERR(descs)) {
280 devres_free(dr);
281 return descs;
284 *dr = descs;
285 devres_add(dev, dr);
287 return descs;
289 EXPORT_SYMBOL_GPL(devm_gpiod_get_array);
292 * devm_gpiod_get_array_optional - Resource-managed gpiod_get_array_optional()
293 * @dev: GPIO consumer
294 * @con_id: function within the GPIO consumer
295 * @flags: optional GPIO initialization flags
297 * Managed gpiod_get_array_optional(). GPIO descriptors returned from this
298 * function are automatically disposed on driver detach.
299 * See gpiod_get_array_optional() for detailed information about behavior and
300 * return values.
302 struct gpio_descs *__must_check
303 devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
304 enum gpiod_flags flags)
306 struct gpio_descs *descs;
308 descs = devm_gpiod_get_array(dev, con_id, flags);
309 if (gpiod_not_found(descs))
310 return NULL;
312 return descs;
314 EXPORT_SYMBOL_GPL(devm_gpiod_get_array_optional);
317 * devm_gpiod_put - Resource-managed gpiod_put()
318 * @dev: GPIO consumer
319 * @desc: GPIO descriptor to dispose of
321 * Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
322 * devm_gpiod_get_index(). Normally this function will not be called as the GPIO
323 * will be disposed of by the resource management code.
325 void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
327 WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match,
328 &desc));
330 EXPORT_SYMBOL_GPL(devm_gpiod_put);
333 * devm_gpiod_unhinge - Remove resource management from a gpio descriptor
334 * @dev: GPIO consumer
335 * @desc: GPIO descriptor to remove resource management from
337 * Remove resource management from a GPIO descriptor. This is needed when
338 * you want to hand over lifecycle management of a descriptor to another
339 * mechanism.
342 void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc)
344 int ret;
346 if (IS_ERR_OR_NULL(desc))
347 return;
348 ret = devres_destroy(dev, devm_gpiod_release,
349 devm_gpiod_match, &desc);
351 * If the GPIO descriptor is requested as nonexclusive, we
352 * may call this function several times on the same descriptor
353 * so it is OK if devres_destroy() returns -ENOENT.
355 if (ret == -ENOENT)
356 return;
357 /* Anything else we should warn about */
358 WARN_ON(ret);
360 EXPORT_SYMBOL_GPL(devm_gpiod_unhinge);
363 * devm_gpiod_put_array - Resource-managed gpiod_put_array()
364 * @dev: GPIO consumer
365 * @descs: GPIO descriptor array to dispose of
367 * Dispose of an array of GPIO descriptors obtained with devm_gpiod_get_array().
368 * Normally this function will not be called as the GPIOs will be disposed of
369 * by the resource management code.
371 void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs)
373 WARN_ON(devres_release(dev, devm_gpiod_release_array,
374 devm_gpiod_match_array, &descs));
376 EXPORT_SYMBOL_GPL(devm_gpiod_put_array);
381 static void devm_gpio_release(struct device *dev, void *res)
383 unsigned *gpio = res;
385 gpio_free(*gpio);
388 static int devm_gpio_match(struct device *dev, void *res, void *data)
390 unsigned *this = res, *gpio = data;
392 return *this == *gpio;
396 * devm_gpio_request - request a GPIO for a managed device
397 * @dev: device to request the GPIO for
398 * @gpio: GPIO to allocate
399 * @label: the name of the requested GPIO
401 * Except for the extra @dev argument, this function takes the
402 * same arguments and performs the same function as
403 * gpio_request(). GPIOs requested with this function will be
404 * automatically freed on driver detach.
406 * If an GPIO allocated with this function needs to be freed
407 * separately, devm_gpio_free() must be used.
410 int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
412 unsigned *dr;
413 int rc;
415 dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
416 if (!dr)
417 return -ENOMEM;
419 rc = gpio_request(gpio, label);
420 if (rc) {
421 devres_free(dr);
422 return rc;
425 *dr = gpio;
426 devres_add(dev, dr);
428 return 0;
430 EXPORT_SYMBOL_GPL(devm_gpio_request);
433 * devm_gpio_request_one - request a single GPIO with initial setup
434 * @dev: device to request for
435 * @gpio: the GPIO number
436 * @flags: GPIO configuration as specified by GPIOF_*
437 * @label: a literal description string of this GPIO
439 int devm_gpio_request_one(struct device *dev, unsigned gpio,
440 unsigned long flags, const char *label)
442 unsigned *dr;
443 int rc;
445 dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
446 if (!dr)
447 return -ENOMEM;
449 rc = gpio_request_one(gpio, flags, label);
450 if (rc) {
451 devres_free(dr);
452 return rc;
455 *dr = gpio;
456 devres_add(dev, dr);
458 return 0;
460 EXPORT_SYMBOL_GPL(devm_gpio_request_one);
463 * devm_gpio_free - free a GPIO
464 * @dev: device to free GPIO for
465 * @gpio: GPIO to free
467 * Except for the extra @dev argument, this function takes the
468 * same arguments and performs the same function as gpio_free().
469 * This function instead of gpio_free() should be used to manually
470 * free GPIOs allocated with devm_gpio_request().
472 void devm_gpio_free(struct device *dev, unsigned int gpio)
475 WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match,
476 &gpio));
478 EXPORT_SYMBOL_GPL(devm_gpio_free);
480 static void devm_gpio_chip_release(void *data)
482 struct gpio_chip *gc = data;
484 gpiochip_remove(gc);
488 * devm_gpiochip_add_data_with_key() - Resource managed gpiochip_add_data_with_key()
489 * @dev: pointer to the device that gpio_chip belongs to.
490 * @gc: the GPIO chip to register
491 * @data: driver-private data associated with this chip
492 * @lock_key: lockdep class for IRQ lock
493 * @request_key: lockdep class for IRQ request
495 * Context: potentially before irqs will work
497 * The gpio chip automatically be released when the device is unbound.
499 * Returns:
500 * A negative errno if the chip can't be registered, such as because the
501 * gc->base is invalid or already associated with a different chip.
502 * Otherwise it returns zero as a success code.
504 int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data,
505 struct lock_class_key *lock_key,
506 struct lock_class_key *request_key)
508 int ret;
510 ret = gpiochip_add_data_with_key(gc, data, lock_key, request_key);
511 if (ret < 0)
512 return ret;
514 return devm_add_action_or_reset(dev, devm_gpio_chip_release, gc);
516 EXPORT_SYMBOL_GPL(devm_gpiochip_add_data_with_key);