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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * devres.c - managed gpio resources
4 * This file is based on kernel/irq/devres.c
5 *
6 * Copyright (c) 2011 John Crispin <john@phrozen.org>
7 */
8
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>
15
16#include "gpiolib.h"
17
18static void devm_gpiod_release(struct device *dev, void *res)
19{
20 struct gpio_desc **desc = res;
21
22 gpiod_put(*desc);
23}
24
25static int devm_gpiod_match(struct device *dev, void *res, void *data)
26{
27 struct gpio_desc **this = res, **gpio = data;
28
29 return *this == *gpio;
30}
31
32static void devm_gpiod_release_array(struct device *dev, void *res)
33{
34 struct gpio_descs **descs = res;
35
36 gpiod_put_array(*descs);
37}
38
39static int devm_gpiod_match_array(struct device *dev, void *res, void *data)
40{
41 struct gpio_descs **this = res, **gpios = data;
42
43 return *this == *gpios;
44}
45
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
51 *
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.
55 */
56struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
57 const char *con_id,
58 enum gpiod_flags flags)
59{
60 return devm_gpiod_get_index(dev, con_id, 0, flags);
61}
62EXPORT_SYMBOL_GPL(devm_gpiod_get);
63
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
69 *
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.
73 */
74struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
75 const char *con_id,
76 enum gpiod_flags flags)
77{
78 return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
79}
80EXPORT_SYMBOL_GPL(devm_gpiod_get_optional);
81
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
88 *
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.
92 */
93struct 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)
97{
98 struct gpio_desc **dr;
99 struct gpio_desc *desc;
100
101 desc = gpiod_get_index(dev, con_id, idx, flags);
102 if (IS_ERR(desc))
103 return desc;
104
105 /*
106 * For non-exclusive GPIO descriptors, check if this descriptor is
107 * already under resource management by this device.
108 */
109 if (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
110 struct devres *dres;
111
112 dres = devres_find(dev, devm_gpiod_release,
113 devm_gpiod_match, &desc);
114 if (dres)
115 return desc;
116 }
117
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);
123 }
124
125 *dr = desc;
126 devres_add(dev, dr);
127
128 return desc;
129}
130EXPORT_SYMBOL_GPL(devm_gpiod_get_index);
131
132/**
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
140 *
141 * Returns:
142 * On successful request the GPIO pin is configured in accordance with
143 * provided @dflags.
144 *
145 * In case of error an ERR_PTR() is returned.
146 */
147struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
148 const struct device_node *node,
149 const char *propname, int index,
150 enum gpiod_flags dflags,
151 const char *label)
152{
153 struct gpio_desc **dr;
154 struct gpio_desc *desc;
155
156 desc = gpiod_get_from_of_node(node, propname, index, dflags, label);
157 if (IS_ERR(desc))
158 return desc;
159
160 /*
161 * For non-exclusive GPIO descriptors, check if this descriptor is
162 * already under resource management by this device.
163 */
164 if (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
165 struct devres *dres;
166
167 dres = devres_find(dev, devm_gpiod_release,
168 devm_gpiod_match, &desc);
169 if (dres)
170 return desc;
171 }
172
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);
178 }
179
180 *dr = desc;
181 devres_add(dev, dr);
182
183 return desc;
184}
185EXPORT_SYMBOL_GPL(devm_gpiod_get_from_of_node);
186
187/**
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
195 *
196 * GPIO descriptors returned from this function are automatically disposed on
197 * driver detach.
198 *
199 * On successful request the GPIO pin is configured in accordance with
200 * provided @flags.
201 */
202struct 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)
207{
208 struct gpio_desc **dr;
209 struct gpio_desc *desc;
210
211 dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
212 GFP_KERNEL);
213 if (!dr)
214 return ERR_PTR(-ENOMEM);
215
216 desc = fwnode_gpiod_get_index(fwnode, con_id, index, flags, label);
217 if (IS_ERR(desc)) {
218 devres_free(dr);
219 return desc;
220 }
221
222 *dr = desc;
223 devres_add(dev, dr);
224
225 return desc;
226}
227EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_index);
228
229/**
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
235 *
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.
240 */
241struct 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)
245{
246 struct gpio_desc *desc;
247
248 desc = devm_gpiod_get_index(dev, con_id, index, flags);
249 if (gpiod_not_found(desc))
250 return NULL;
251
252 return desc;
253}
254EXPORT_SYMBOL_GPL(devm_gpiod_get_index_optional);
255
256/**
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
261 *
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.
265 */
266struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
267 const char *con_id,
268 enum gpiod_flags flags)
269{
270 struct gpio_descs **dr;
271 struct gpio_descs *descs;
272
273 dr = devres_alloc(devm_gpiod_release_array,
274 sizeof(struct gpio_descs *), GFP_KERNEL);
275 if (!dr)
276 return ERR_PTR(-ENOMEM);
277
278 descs = gpiod_get_array(dev, con_id, flags);
279 if (IS_ERR(descs)) {
280 devres_free(dr);
281 return descs;
282 }
283
284 *dr = descs;
285 devres_add(dev, dr);
286
287 return descs;
288}
289EXPORT_SYMBOL_GPL(devm_gpiod_get_array);
290
291/**
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
296 *
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.
301 */
302struct gpio_descs *__must_check
303devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
304 enum gpiod_flags flags)
305{
306 struct gpio_descs *descs;
307
308 descs = devm_gpiod_get_array(dev, con_id, flags);
309 if (gpiod_not_found(descs))
310 return NULL;
311
312 return descs;
313}
314EXPORT_SYMBOL_GPL(devm_gpiod_get_array_optional);
315
316/**
317 * devm_gpiod_put - Resource-managed gpiod_put()
318 * @dev: GPIO consumer
319 * @desc: GPIO descriptor to dispose of
320 *
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.
324 */
325void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
326{
327 WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match,
328 &desc));
329}
330EXPORT_SYMBOL_GPL(devm_gpiod_put);
331
332/**
333 * devm_gpiod_unhinge - Remove resource management from a gpio descriptor
334 * @dev: GPIO consumer
335 * @desc: GPIO descriptor to remove resource management from
336 *
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.
340 */
341
342void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc)
343{
344 int ret;
345
346 if (IS_ERR_OR_NULL(desc))
347 return;
348 ret = devres_destroy(dev, devm_gpiod_release,
349 devm_gpiod_match, &desc);
350 /*
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.
354 */
355 if (ret == -ENOENT)
356 return;
357 /* Anything else we should warn about */
358 WARN_ON(ret);
359}
360EXPORT_SYMBOL_GPL(devm_gpiod_unhinge);
361
362/**
363 * devm_gpiod_put_array - Resource-managed gpiod_put_array()
364 * @dev: GPIO consumer
365 * @descs: GPIO descriptor array to dispose of
366 *
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.
370 */
371void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs)
372{
373 WARN_ON(devres_release(dev, devm_gpiod_release_array,
374 devm_gpiod_match_array, &descs));
375}
376EXPORT_SYMBOL_GPL(devm_gpiod_put_array);
377
378static void devm_gpio_release(struct device *dev, void *res)
379{
380 unsigned *gpio = res;
381
382 gpio_free(*gpio);
383}
384
385/**
386 * devm_gpio_request - request a GPIO for a managed device
387 * @dev: device to request the GPIO for
388 * @gpio: GPIO to allocate
389 * @label: the name of the requested GPIO
390 *
391 * Except for the extra @dev argument, this function takes the
392 * same arguments and performs the same function as
393 * gpio_request(). GPIOs requested with this function will be
394 * automatically freed on driver detach.
395 */
396int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
397{
398 unsigned *dr;
399 int rc;
400
401 dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
402 if (!dr)
403 return -ENOMEM;
404
405 rc = gpio_request(gpio, label);
406 if (rc) {
407 devres_free(dr);
408 return rc;
409 }
410
411 *dr = gpio;
412 devres_add(dev, dr);
413
414 return 0;
415}
416EXPORT_SYMBOL_GPL(devm_gpio_request);
417
418/**
419 * devm_gpio_request_one - request a single GPIO with initial setup
420 * @dev: device to request for
421 * @gpio: the GPIO number
422 * @flags: GPIO configuration as specified by GPIOF_*
423 * @label: a literal description string of this GPIO
424 */
425int devm_gpio_request_one(struct device *dev, unsigned gpio,
426 unsigned long flags, const char *label)
427{
428 unsigned *dr;
429 int rc;
430
431 dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
432 if (!dr)
433 return -ENOMEM;
434
435 rc = gpio_request_one(gpio, flags, label);
436 if (rc) {
437 devres_free(dr);
438 return rc;
439 }
440
441 *dr = gpio;
442 devres_add(dev, dr);
443
444 return 0;
445}
446EXPORT_SYMBOL_GPL(devm_gpio_request_one);
447
448static void devm_gpio_chip_release(void *data)
449{
450 struct gpio_chip *gc = data;
451
452 gpiochip_remove(gc);
453}
454
455/**
456 * devm_gpiochip_add_data_with_key() - Resource managed gpiochip_add_data_with_key()
457 * @dev: pointer to the device that gpio_chip belongs to.
458 * @gc: the GPIO chip to register
459 * @data: driver-private data associated with this chip
460 * @lock_key: lockdep class for IRQ lock
461 * @request_key: lockdep class for IRQ request
462 *
463 * Context: potentially before irqs will work
464 *
465 * The gpio chip automatically be released when the device is unbound.
466 *
467 * Returns:
468 * A negative errno if the chip can't be registered, such as because the
469 * gc->base is invalid or already associated with a different chip.
470 * Otherwise it returns zero as a success code.
471 */
472int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data,
473 struct lock_class_key *lock_key,
474 struct lock_class_key *request_key)
475{
476 int ret;
477
478 ret = gpiochip_add_data_with_key(gc, data, lock_key, request_key);
479 if (ret < 0)
480 return ret;
481
482 return devm_add_action_or_reset(dev, devm_gpio_chip_release, gc);
483}
484EXPORT_SYMBOL_GPL(devm_gpiochip_add_data_with_key);
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * devres.c - managed gpio resources
4 * This file is based on kernel/irq/devres.c
5 *
6 * Copyright (c) 2011 John Crispin <john@phrozen.org>
7 */
8
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>
15
16#include "gpiolib.h"
17
18static void devm_gpiod_release(struct device *dev, void *res)
19{
20 struct gpio_desc **desc = res;
21
22 gpiod_put(*desc);
23}
24
25static int devm_gpiod_match(struct device *dev, void *res, void *data)
26{
27 struct gpio_desc **this = res, **gpio = data;
28
29 return *this == *gpio;
30}
31
32static void devm_gpiod_release_array(struct device *dev, void *res)
33{
34 struct gpio_descs **descs = res;
35
36 gpiod_put_array(*descs);
37}
38
39static int devm_gpiod_match_array(struct device *dev, void *res, void *data)
40{
41 struct gpio_descs **this = res, **gpios = data;
42
43 return *this == *gpios;
44}
45
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
51 *
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.
55 */
56struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
57 const char *con_id,
58 enum gpiod_flags flags)
59{
60 return devm_gpiod_get_index(dev, con_id, 0, flags);
61}
62EXPORT_SYMBOL_GPL(devm_gpiod_get);
63
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
69 *
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.
73 */
74struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
75 const char *con_id,
76 enum gpiod_flags flags)
77{
78 return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
79}
80EXPORT_SYMBOL_GPL(devm_gpiod_get_optional);
81
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
88 *
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.
92 */
93struct 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)
97{
98 struct gpio_desc **dr;
99 struct gpio_desc *desc;
100
101 desc = gpiod_get_index(dev, con_id, idx, flags);
102 if (IS_ERR(desc))
103 return desc;
104
105 /*
106 * For non-exclusive GPIO descriptors, check if this descriptor is
107 * already under resource management by this device.
108 */
109 if (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
110 struct devres *dres;
111
112 dres = devres_find(dev, devm_gpiod_release,
113 devm_gpiod_match, &desc);
114 if (dres)
115 return desc;
116 }
117
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);
123 }
124
125 *dr = desc;
126 devres_add(dev, dr);
127
128 return desc;
129}
130EXPORT_SYMBOL_GPL(devm_gpiod_get_index);
131
132/**
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
140 *
141 * Returns:
142 * On successful request the GPIO pin is configured in accordance with
143 * provided @dflags.
144 *
145 * In case of error an ERR_PTR() is returned.
146 */
147struct 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)
152{
153 struct gpio_desc **dr;
154 struct gpio_desc *desc;
155
156 desc = gpiod_get_from_of_node(node, propname, index, dflags, label);
157 if (IS_ERR(desc))
158 return desc;
159
160 /*
161 * For non-exclusive GPIO descriptors, check if this descriptor is
162 * already under resource management by this device.
163 */
164 if (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
165 struct devres *dres;
166
167 dres = devres_find(dev, devm_gpiod_release,
168 devm_gpiod_match, &desc);
169 if (dres)
170 return desc;
171 }
172
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);
178 }
179
180 *dr = desc;
181 devres_add(dev, dr);
182
183 return desc;
184}
185EXPORT_SYMBOL_GPL(devm_gpiod_get_from_of_node);
186
187/**
188 * devm_fwnode_get_index_gpiod_from_child - get a GPIO descriptor from a
189 * device's child node
190 * @dev: GPIO consumer
191 * @con_id: function within the GPIO consumer
192 * @index: index of the GPIO to obtain in the consumer
193 * @child: firmware node (child of @dev)
194 * @flags: GPIO initialization flags
195 * @label: label to attach to the requested GPIO
196 *
197 * GPIO descriptors returned from this function are automatically disposed on
198 * driver detach.
199 *
200 * On successful request the GPIO pin is configured in accordance with
201 * provided @flags.
202 */
203struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
204 const char *con_id, int index,
205 struct fwnode_handle *child,
206 enum gpiod_flags flags,
207 const char *label)
208{
209 char prop_name[32]; /* 32 is max size of property name */
210 struct gpio_desc **dr;
211 struct gpio_desc *desc;
212 unsigned int i;
213
214 dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
215 GFP_KERNEL);
216 if (!dr)
217 return ERR_PTR(-ENOMEM);
218
219 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
220 if (con_id)
221 snprintf(prop_name, sizeof(prop_name), "%s-%s",
222 con_id, gpio_suffixes[i]);
223 else
224 snprintf(prop_name, sizeof(prop_name), "%s",
225 gpio_suffixes[i]);
226
227 desc = fwnode_get_named_gpiod(child, prop_name, index, flags,
228 label);
229 if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
230 break;
231 }
232 if (IS_ERR(desc)) {
233 devres_free(dr);
234 return desc;
235 }
236
237 *dr = desc;
238 devres_add(dev, dr);
239
240 return desc;
241}
242EXPORT_SYMBOL_GPL(devm_fwnode_get_index_gpiod_from_child);
243
244/**
245 * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
246 * @dev: GPIO consumer
247 * @con_id: function within the GPIO consumer
248 * @index: index of the GPIO to obtain in the consumer
249 * @flags: optional GPIO initialization flags
250 *
251 * Managed gpiod_get_index_optional(). GPIO descriptors returned from this
252 * function are automatically disposed on driver detach. See
253 * gpiod_get_index_optional() for detailed information about behavior and
254 * return values.
255 */
256struct gpio_desc *__must_check devm_gpiod_get_index_optional(struct device *dev,
257 const char *con_id,
258 unsigned int index,
259 enum gpiod_flags flags)
260{
261 struct gpio_desc *desc;
262
263 desc = devm_gpiod_get_index(dev, con_id, index, flags);
264 if (IS_ERR(desc)) {
265 if (PTR_ERR(desc) == -ENOENT)
266 return NULL;
267 }
268
269 return desc;
270}
271EXPORT_SYMBOL_GPL(devm_gpiod_get_index_optional);
272
273/**
274 * devm_gpiod_get_array - Resource-managed gpiod_get_array()
275 * @dev: GPIO consumer
276 * @con_id: function within the GPIO consumer
277 * @flags: optional GPIO initialization flags
278 *
279 * Managed gpiod_get_array(). GPIO descriptors returned from this function are
280 * automatically disposed on driver detach. See gpiod_get_array() for detailed
281 * information about behavior and return values.
282 */
283struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
284 const char *con_id,
285 enum gpiod_flags flags)
286{
287 struct gpio_descs **dr;
288 struct gpio_descs *descs;
289
290 dr = devres_alloc(devm_gpiod_release_array,
291 sizeof(struct gpio_descs *), GFP_KERNEL);
292 if (!dr)
293 return ERR_PTR(-ENOMEM);
294
295 descs = gpiod_get_array(dev, con_id, flags);
296 if (IS_ERR(descs)) {
297 devres_free(dr);
298 return descs;
299 }
300
301 *dr = descs;
302 devres_add(dev, dr);
303
304 return descs;
305}
306EXPORT_SYMBOL_GPL(devm_gpiod_get_array);
307
308/**
309 * devm_gpiod_get_array_optional - Resource-managed gpiod_get_array_optional()
310 * @dev: GPIO consumer
311 * @con_id: function within the GPIO consumer
312 * @flags: optional GPIO initialization flags
313 *
314 * Managed gpiod_get_array_optional(). GPIO descriptors returned from this
315 * function are automatically disposed on driver detach.
316 * See gpiod_get_array_optional() for detailed information about behavior and
317 * return values.
318 */
319struct gpio_descs *__must_check
320devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
321 enum gpiod_flags flags)
322{
323 struct gpio_descs *descs;
324
325 descs = devm_gpiod_get_array(dev, con_id, flags);
326 if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
327 return NULL;
328
329 return descs;
330}
331EXPORT_SYMBOL_GPL(devm_gpiod_get_array_optional);
332
333/**
334 * devm_gpiod_put - Resource-managed gpiod_put()
335 * @dev: GPIO consumer
336 * @desc: GPIO descriptor to dispose of
337 *
338 * Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
339 * devm_gpiod_get_index(). Normally this function will not be called as the GPIO
340 * will be disposed of by the resource management code.
341 */
342void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
343{
344 WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match,
345 &desc));
346}
347EXPORT_SYMBOL_GPL(devm_gpiod_put);
348
349/**
350 * devm_gpiod_unhinge - Remove resource management from a gpio descriptor
351 * @dev: GPIO consumer
352 * @desc: GPIO descriptor to remove resource management from
353 *
354 * Remove resource management from a GPIO descriptor. This is needed when
355 * you want to hand over lifecycle management of a descriptor to another
356 * mechanism.
357 */
358
359void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc)
360{
361 int ret;
362
363 if (IS_ERR_OR_NULL(desc))
364 return;
365 ret = devres_destroy(dev, devm_gpiod_release,
366 devm_gpiod_match, &desc);
367 /*
368 * If the GPIO descriptor is requested as nonexclusive, we
369 * may call this function several times on the same descriptor
370 * so it is OK if devres_destroy() returns -ENOENT.
371 */
372 if (ret == -ENOENT)
373 return;
374 /* Anything else we should warn about */
375 WARN_ON(ret);
376}
377EXPORT_SYMBOL_GPL(devm_gpiod_unhinge);
378
379/**
380 * devm_gpiod_put_array - Resource-managed gpiod_put_array()
381 * @dev: GPIO consumer
382 * @descs: GPIO descriptor array to dispose of
383 *
384 * Dispose of an array of GPIO descriptors obtained with devm_gpiod_get_array().
385 * Normally this function will not be called as the GPIOs will be disposed of
386 * by the resource management code.
387 */
388void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs)
389{
390 WARN_ON(devres_release(dev, devm_gpiod_release_array,
391 devm_gpiod_match_array, &descs));
392}
393EXPORT_SYMBOL_GPL(devm_gpiod_put_array);
394
395
396
397
398static void devm_gpio_release(struct device *dev, void *res)
399{
400 unsigned *gpio = res;
401
402 gpio_free(*gpio);
403}
404
405static int devm_gpio_match(struct device *dev, void *res, void *data)
406{
407 unsigned *this = res, *gpio = data;
408
409 return *this == *gpio;
410}
411
412/**
413 * devm_gpio_request - request a GPIO for a managed device
414 * @dev: device to request the GPIO for
415 * @gpio: GPIO to allocate
416 * @label: the name of the requested GPIO
417 *
418 * Except for the extra @dev argument, this function takes the
419 * same arguments and performs the same function as
420 * gpio_request(). GPIOs requested with this function will be
421 * automatically freed on driver detach.
422 *
423 * If an GPIO allocated with this function needs to be freed
424 * separately, devm_gpio_free() must be used.
425 */
426
427int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
428{
429 unsigned *dr;
430 int rc;
431
432 dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
433 if (!dr)
434 return -ENOMEM;
435
436 rc = gpio_request(gpio, label);
437 if (rc) {
438 devres_free(dr);
439 return rc;
440 }
441
442 *dr = gpio;
443 devres_add(dev, dr);
444
445 return 0;
446}
447EXPORT_SYMBOL_GPL(devm_gpio_request);
448
449/**
450 * devm_gpio_request_one - request a single GPIO with initial setup
451 * @dev: device to request for
452 * @gpio: the GPIO number
453 * @flags: GPIO configuration as specified by GPIOF_*
454 * @label: a literal description string of this GPIO
455 */
456int devm_gpio_request_one(struct device *dev, unsigned gpio,
457 unsigned long flags, const char *label)
458{
459 unsigned *dr;
460 int rc;
461
462 dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
463 if (!dr)
464 return -ENOMEM;
465
466 rc = gpio_request_one(gpio, flags, label);
467 if (rc) {
468 devres_free(dr);
469 return rc;
470 }
471
472 *dr = gpio;
473 devres_add(dev, dr);
474
475 return 0;
476}
477EXPORT_SYMBOL_GPL(devm_gpio_request_one);
478
479/**
480 * devm_gpio_free - free a GPIO
481 * @dev: device to free GPIO for
482 * @gpio: GPIO to free
483 *
484 * Except for the extra @dev argument, this function takes the
485 * same arguments and performs the same function as gpio_free().
486 * This function instead of gpio_free() should be used to manually
487 * free GPIOs allocated with devm_gpio_request().
488 */
489void devm_gpio_free(struct device *dev, unsigned int gpio)
490{
491
492 WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match,
493 &gpio));
494}
495EXPORT_SYMBOL_GPL(devm_gpio_free);