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1// SPDX-License-Identifier: GPL-2.0+
2//
3// soc-jack.c -- ALSA SoC jack handling
4//
5// Copyright 2008 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9#include <sound/jack.h>
10#include <sound/soc.h>
11#include <linux/gpio.h>
12#include <linux/gpio/consumer.h>
13#include <linux/interrupt.h>
14#include <linux/workqueue.h>
15#include <linux/delay.h>
16#include <linux/export.h>
17#include <linux/suspend.h>
18#include <trace/events/asoc.h>
19
20/**
21 * snd_soc_jack_report - Report the current status for a jack
22 *
23 * @jack: the jack
24 * @status: a bitmask of enum snd_jack_type values that are currently detected.
25 * @mask: a bitmask of enum snd_jack_type values that being reported.
26 *
27 * If configured using snd_soc_jack_add_pins() then the associated
28 * DAPM pins will be enabled or disabled as appropriate and DAPM
29 * synchronised.
30 *
31 * Note: This function uses mutexes and should be called from a
32 * context which can sleep (such as a workqueue).
33 */
34void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
35{
36 struct snd_soc_dapm_context *dapm;
37 struct snd_soc_jack_pin *pin;
38 unsigned int sync = 0;
39
40 if (!jack)
41 return;
42 trace_snd_soc_jack_report(jack, mask, status);
43
44 dapm = &jack->card->dapm;
45
46 mutex_lock(&jack->mutex);
47
48 jack->status &= ~mask;
49 jack->status |= status & mask;
50
51 trace_snd_soc_jack_notify(jack, status);
52
53 list_for_each_entry(pin, &jack->pins, list) {
54 int enable = pin->mask & jack->status;
55
56 if (pin->invert)
57 enable = !enable;
58
59 if (enable)
60 snd_soc_dapm_enable_pin(dapm, pin->pin);
61 else
62 snd_soc_dapm_disable_pin(dapm, pin->pin);
63
64 /* we need to sync for this case only */
65 sync = 1;
66 }
67
68 /* Report before the DAPM sync to help users updating micbias status */
69 blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
70
71 if (sync)
72 snd_soc_dapm_sync(dapm);
73
74 snd_jack_report(jack->jack, jack->status);
75
76 mutex_unlock(&jack->mutex);
77}
78EXPORT_SYMBOL_GPL(snd_soc_jack_report);
79
80/**
81 * snd_soc_jack_add_zones - Associate voltage zones with jack
82 *
83 * @jack: ASoC jack
84 * @count: Number of zones
85 * @zones: Array of zones
86 *
87 * After this function has been called the zones specified in the
88 * array will be associated with the jack.
89 */
90int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
91 struct snd_soc_jack_zone *zones)
92{
93 int i;
94
95 for (i = 0; i < count; i++) {
96 INIT_LIST_HEAD(&zones[i].list);
97 list_add(&(zones[i].list), &jack->jack_zones);
98 }
99 return 0;
100}
101EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
102
103/**
104 * snd_soc_jack_get_type - Based on the mic bias value, this function returns
105 * the type of jack from the zones declared in the jack type
106 *
107 * @jack: ASoC jack
108 * @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
109 *
110 * Based on the mic bias value passed, this function helps identify
111 * the type of jack from the already declared jack zones
112 */
113int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
114{
115 struct snd_soc_jack_zone *zone;
116
117 list_for_each_entry(zone, &jack->jack_zones, list) {
118 if (micbias_voltage >= zone->min_mv &&
119 micbias_voltage < zone->max_mv)
120 return zone->jack_type;
121 }
122 return 0;
123}
124EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
125
126/**
127 * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
128 *
129 * @jack: ASoC jack created with snd_soc_card_jack_new_pins()
130 * @count: Number of pins
131 * @pins: Array of pins
132 *
133 * After this function has been called the DAPM pins specified in the
134 * pins array will have their status updated to reflect the current
135 * state of the jack whenever the jack status is updated.
136 */
137int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
138 struct snd_soc_jack_pin *pins)
139{
140 int i;
141
142 for (i = 0; i < count; i++) {
143 if (!pins[i].pin) {
144 dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
145 i);
146 return -EINVAL;
147 }
148 if (!pins[i].mask) {
149 dev_err(jack->card->dev, "ASoC: No mask for pin %d"
150 " (%s)\n", i, pins[i].pin);
151 return -EINVAL;
152 }
153
154 INIT_LIST_HEAD(&pins[i].list);
155 list_add(&(pins[i].list), &jack->pins);
156 snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask);
157 }
158
159 /* Update to reflect the last reported status; canned jack
160 * implementations are likely to set their state before the
161 * card has an opportunity to associate pins.
162 */
163 snd_soc_jack_report(jack, 0, 0);
164
165 return 0;
166}
167EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
168
169/**
170 * snd_soc_jack_notifier_register - Register a notifier for jack status
171 *
172 * @jack: ASoC jack
173 * @nb: Notifier block to register
174 *
175 * Register for notification of the current status of the jack. Note
176 * that it is not possible to report additional jack events in the
177 * callback from the notifier, this is intended to support
178 * applications such as enabling electrical detection only when a
179 * mechanical detection event has occurred.
180 */
181void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
182 struct notifier_block *nb)
183{
184 blocking_notifier_chain_register(&jack->notifier, nb);
185}
186EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
187
188/**
189 * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
190 *
191 * @jack: ASoC jack
192 * @nb: Notifier block to unregister
193 *
194 * Stop notifying for status changes.
195 */
196void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
197 struct notifier_block *nb)
198{
199 blocking_notifier_chain_unregister(&jack->notifier, nb);
200}
201EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
202
203#ifdef CONFIG_GPIOLIB
204struct jack_gpio_tbl {
205 int count;
206 struct snd_soc_jack *jack;
207 struct snd_soc_jack_gpio *gpios;
208};
209
210/* gpio detect */
211static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
212{
213 struct snd_soc_jack *jack = gpio->jack;
214 int enable;
215 int report;
216
217 enable = gpiod_get_value_cansleep(gpio->desc);
218 if (gpio->invert)
219 enable = !enable;
220
221 if (enable)
222 report = gpio->report;
223 else
224 report = 0;
225
226 if (gpio->jack_status_check)
227 report = gpio->jack_status_check(gpio->data);
228
229 snd_soc_jack_report(jack, report, gpio->report);
230}
231
232/* irq handler for gpio pin */
233static irqreturn_t gpio_handler(int irq, void *data)
234{
235 struct snd_soc_jack_gpio *gpio = data;
236 struct device *dev = gpio->jack->card->dev;
237
238 trace_snd_soc_jack_irq(gpio->name);
239
240 if (device_may_wakeup(dev))
241 pm_wakeup_event(dev, gpio->debounce_time + 50);
242
243 queue_delayed_work(system_power_efficient_wq, &gpio->work,
244 msecs_to_jiffies(gpio->debounce_time));
245
246 return IRQ_HANDLED;
247}
248
249/* gpio work */
250static void gpio_work(struct work_struct *work)
251{
252 struct snd_soc_jack_gpio *gpio;
253
254 gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
255 snd_soc_jack_gpio_detect(gpio);
256}
257
258static int snd_soc_jack_pm_notifier(struct notifier_block *nb,
259 unsigned long action, void *data)
260{
261 struct snd_soc_jack_gpio *gpio =
262 container_of(nb, struct snd_soc_jack_gpio, pm_notifier);
263
264 switch (action) {
265 case PM_POST_SUSPEND:
266 case PM_POST_HIBERNATION:
267 case PM_POST_RESTORE:
268 /*
269 * Use workqueue so we do not have to care about running
270 * concurrently with work triggered by the interrupt handler.
271 */
272 queue_delayed_work(system_power_efficient_wq, &gpio->work, 0);
273 break;
274 }
275
276 return NOTIFY_DONE;
277}
278
279static void jack_free_gpios(struct snd_soc_jack *jack, int count,
280 struct snd_soc_jack_gpio *gpios)
281{
282 int i;
283
284 for (i = 0; i < count; i++) {
285 gpiod_unexport(gpios[i].desc);
286 unregister_pm_notifier(&gpios[i].pm_notifier);
287 free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
288 cancel_delayed_work_sync(&gpios[i].work);
289 gpiod_put(gpios[i].desc);
290 gpios[i].jack = NULL;
291 }
292}
293
294static void jack_devres_free_gpios(struct device *dev, void *res)
295{
296 struct jack_gpio_tbl *tbl = res;
297
298 jack_free_gpios(tbl->jack, tbl->count, tbl->gpios);
299}
300
301/**
302 * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
303 *
304 * @jack: ASoC jack
305 * @count: number of pins
306 * @gpios: array of gpio pins
307 *
308 * This function will request gpio, set data direction and request irq
309 * for each gpio in the array.
310 */
311int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
312 struct snd_soc_jack_gpio *gpios)
313{
314 int i, ret;
315 struct jack_gpio_tbl *tbl;
316
317 tbl = devres_alloc(jack_devres_free_gpios, sizeof(*tbl), GFP_KERNEL);
318 if (!tbl)
319 return -ENOMEM;
320 tbl->jack = jack;
321 tbl->count = count;
322 tbl->gpios = gpios;
323
324 for (i = 0; i < count; i++) {
325 if (!gpios[i].name) {
326 dev_err(jack->card->dev,
327 "ASoC: No name for gpio at index %d\n", i);
328 ret = -EINVAL;
329 goto undo;
330 }
331
332 if (gpios[i].desc) {
333 /* Already have a GPIO descriptor. */
334 goto got_gpio;
335 } else if (gpios[i].gpiod_dev) {
336 /* Get a GPIO descriptor */
337 gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
338 gpios[i].name,
339 gpios[i].idx, GPIOD_IN);
340 if (IS_ERR(gpios[i].desc)) {
341 ret = PTR_ERR(gpios[i].desc);
342 dev_err(gpios[i].gpiod_dev,
343 "ASoC: Cannot get gpio at index %d: %d",
344 i, ret);
345 goto undo;
346 }
347 } else {
348 /* legacy GPIO number */
349 if (!gpio_is_valid(gpios[i].gpio)) {
350 dev_err(jack->card->dev,
351 "ASoC: Invalid gpio %d\n",
352 gpios[i].gpio);
353 ret = -EINVAL;
354 goto undo;
355 }
356
357 ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
358 gpios[i].name);
359 if (ret)
360 goto undo;
361
362 gpios[i].desc = gpio_to_desc(gpios[i].gpio);
363 }
364got_gpio:
365 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
366 gpios[i].jack = jack;
367
368 ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
369 gpio_handler,
370 IRQF_TRIGGER_RISING |
371 IRQF_TRIGGER_FALLING,
372 gpios[i].name,
373 &gpios[i]);
374 if (ret < 0)
375 goto err;
376
377 if (gpios[i].wake) {
378 ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
379 if (ret != 0)
380 dev_err(jack->card->dev,
381 "ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
382 i, ret);
383 }
384
385 /*
386 * Register PM notifier so we do not miss state transitions
387 * happening while system is asleep.
388 */
389 gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier;
390 register_pm_notifier(&gpios[i].pm_notifier);
391
392 /* Expose GPIO value over sysfs for diagnostic purposes */
393 gpiod_export(gpios[i].desc, false);
394
395 /* Update initial jack status */
396 schedule_delayed_work(&gpios[i].work,
397 msecs_to_jiffies(gpios[i].debounce_time));
398 }
399
400 devres_add(jack->card->dev, tbl);
401 return 0;
402
403err:
404 gpio_free(gpios[i].gpio);
405undo:
406 jack_free_gpios(jack, i, gpios);
407 devres_free(tbl);
408
409 return ret;
410}
411EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
412
413/**
414 * snd_soc_jack_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
415 *
416 * @gpiod_dev: GPIO consumer device
417 * @jack: ASoC jack
418 * @count: number of pins
419 * @gpios: array of gpio pins
420 *
421 * This function will request gpio, set data direction and request irq
422 * for each gpio in the array.
423 */
424int snd_soc_jack_add_gpiods(struct device *gpiod_dev,
425 struct snd_soc_jack *jack,
426 int count, struct snd_soc_jack_gpio *gpios)
427{
428 int i;
429
430 for (i = 0; i < count; i++)
431 gpios[i].gpiod_dev = gpiod_dev;
432
433 return snd_soc_jack_add_gpios(jack, count, gpios);
434}
435EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);
436
437/**
438 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
439 *
440 * @jack: ASoC jack
441 * @count: number of pins
442 * @gpios: array of gpio pins
443 *
444 * Release gpio and irq resources for gpio pins associated with an ASoC jack.
445 */
446void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
447 struct snd_soc_jack_gpio *gpios)
448{
449 jack_free_gpios(jack, count, gpios);
450 devres_destroy(jack->card->dev, jack_devres_free_gpios, NULL, NULL);
451}
452EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
453#endif /* CONFIG_GPIOLIB */
1/*
2 * soc-jack.c -- ALSA SoC jack handling
3 *
4 * Copyright 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <sound/jack.h>
15#include <sound/soc.h>
16#include <linux/gpio.h>
17#include <linux/interrupt.h>
18#include <linux/workqueue.h>
19#include <linux/delay.h>
20#include <trace/events/asoc.h>
21
22/**
23 * snd_soc_jack_new - Create a new jack
24 * @card: ASoC card
25 * @id: an identifying string for this jack
26 * @type: a bitmask of enum snd_jack_type values that can be detected by
27 * this jack
28 * @jack: structure to use for the jack
29 *
30 * Creates a new jack object.
31 *
32 * Returns zero if successful, or a negative error code on failure.
33 * On success jack will be initialised.
34 */
35int snd_soc_jack_new(struct snd_soc_codec *codec, const char *id, int type,
36 struct snd_soc_jack *jack)
37{
38 jack->codec = codec;
39 INIT_LIST_HEAD(&jack->pins);
40 INIT_LIST_HEAD(&jack->jack_zones);
41 BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
42
43 return snd_jack_new(codec->card->snd_card, id, type, &jack->jack);
44}
45EXPORT_SYMBOL_GPL(snd_soc_jack_new);
46
47/**
48 * snd_soc_jack_report - Report the current status for a jack
49 *
50 * @jack: the jack
51 * @status: a bitmask of enum snd_jack_type values that are currently detected.
52 * @mask: a bitmask of enum snd_jack_type values that being reported.
53 *
54 * If configured using snd_soc_jack_add_pins() then the associated
55 * DAPM pins will be enabled or disabled as appropriate and DAPM
56 * synchronised.
57 *
58 * Note: This function uses mutexes and should be called from a
59 * context which can sleep (such as a workqueue).
60 */
61void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
62{
63 struct snd_soc_codec *codec;
64 struct snd_soc_dapm_context *dapm;
65 struct snd_soc_jack_pin *pin;
66 int enable;
67 int oldstatus;
68
69 trace_snd_soc_jack_report(jack, mask, status);
70
71 if (!jack)
72 return;
73
74 codec = jack->codec;
75 dapm = &codec->dapm;
76
77 mutex_lock(&codec->mutex);
78
79 oldstatus = jack->status;
80
81 jack->status &= ~mask;
82 jack->status |= status & mask;
83
84 /* The DAPM sync is expensive enough to be worth skipping.
85 * However, empty mask means pin synchronization is desired. */
86 if (mask && (jack->status == oldstatus))
87 goto out;
88
89 trace_snd_soc_jack_notify(jack, status);
90
91 list_for_each_entry(pin, &jack->pins, list) {
92 enable = pin->mask & jack->status;
93
94 if (pin->invert)
95 enable = !enable;
96
97 if (enable)
98 snd_soc_dapm_enable_pin(dapm, pin->pin);
99 else
100 snd_soc_dapm_disable_pin(dapm, pin->pin);
101 }
102
103 /* Report before the DAPM sync to help users updating micbias status */
104 blocking_notifier_call_chain(&jack->notifier, status, jack);
105
106 snd_soc_dapm_sync(dapm);
107
108 snd_jack_report(jack->jack, jack->status);
109
110out:
111 mutex_unlock(&codec->mutex);
112}
113EXPORT_SYMBOL_GPL(snd_soc_jack_report);
114
115/**
116 * snd_soc_jack_add_zones - Associate voltage zones with jack
117 *
118 * @jack: ASoC jack
119 * @count: Number of zones
120 * @zone: Array of zones
121 *
122 * After this function has been called the zones specified in the
123 * array will be associated with the jack.
124 */
125int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
126 struct snd_soc_jack_zone *zones)
127{
128 int i;
129
130 for (i = 0; i < count; i++) {
131 INIT_LIST_HEAD(&zones[i].list);
132 list_add(&(zones[i].list), &jack->jack_zones);
133 }
134 return 0;
135}
136EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
137
138/**
139 * snd_soc_jack_get_type - Based on the mic bias value, this function returns
140 * the type of jack from the zones delcared in the jack type
141 *
142 * @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
143 *
144 * Based on the mic bias value passed, this function helps identify
145 * the type of jack from the already delcared jack zones
146 */
147int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
148{
149 struct snd_soc_jack_zone *zone;
150
151 list_for_each_entry(zone, &jack->jack_zones, list) {
152 if (micbias_voltage >= zone->min_mv &&
153 micbias_voltage < zone->max_mv)
154 return zone->jack_type;
155 }
156 return 0;
157}
158EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
159
160/**
161 * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
162 *
163 * @jack: ASoC jack
164 * @count: Number of pins
165 * @pins: Array of pins
166 *
167 * After this function has been called the DAPM pins specified in the
168 * pins array will have their status updated to reflect the current
169 * state of the jack whenever the jack status is updated.
170 */
171int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
172 struct snd_soc_jack_pin *pins)
173{
174 int i;
175
176 for (i = 0; i < count; i++) {
177 if (!pins[i].pin) {
178 printk(KERN_ERR "No name for pin %d\n", i);
179 return -EINVAL;
180 }
181 if (!pins[i].mask) {
182 printk(KERN_ERR "No mask for pin %d (%s)\n", i,
183 pins[i].pin);
184 return -EINVAL;
185 }
186
187 INIT_LIST_HEAD(&pins[i].list);
188 list_add(&(pins[i].list), &jack->pins);
189 }
190
191 /* Update to reflect the last reported status; canned jack
192 * implementations are likely to set their state before the
193 * card has an opportunity to associate pins.
194 */
195 snd_soc_jack_report(jack, 0, 0);
196
197 return 0;
198}
199EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
200
201/**
202 * snd_soc_jack_notifier_register - Register a notifier for jack status
203 *
204 * @jack: ASoC jack
205 * @nb: Notifier block to register
206 *
207 * Register for notification of the current status of the jack. Note
208 * that it is not possible to report additional jack events in the
209 * callback from the notifier, this is intended to support
210 * applications such as enabling electrical detection only when a
211 * mechanical detection event has occurred.
212 */
213void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
214 struct notifier_block *nb)
215{
216 blocking_notifier_chain_register(&jack->notifier, nb);
217}
218EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
219
220/**
221 * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
222 *
223 * @jack: ASoC jack
224 * @nb: Notifier block to unregister
225 *
226 * Stop notifying for status changes.
227 */
228void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
229 struct notifier_block *nb)
230{
231 blocking_notifier_chain_unregister(&jack->notifier, nb);
232}
233EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
234
235#ifdef CONFIG_GPIOLIB
236/* gpio detect */
237static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
238{
239 struct snd_soc_jack *jack = gpio->jack;
240 int enable;
241 int report;
242
243 enable = gpio_get_value_cansleep(gpio->gpio);
244 if (gpio->invert)
245 enable = !enable;
246
247 if (enable)
248 report = gpio->report;
249 else
250 report = 0;
251
252 if (gpio->jack_status_check)
253 report = gpio->jack_status_check();
254
255 snd_soc_jack_report(jack, report, gpio->report);
256}
257
258/* irq handler for gpio pin */
259static irqreturn_t gpio_handler(int irq, void *data)
260{
261 struct snd_soc_jack_gpio *gpio = data;
262 struct device *dev = gpio->jack->codec->card->dev;
263
264 trace_snd_soc_jack_irq(gpio->name);
265
266 if (device_may_wakeup(dev))
267 pm_wakeup_event(dev, gpio->debounce_time + 50);
268
269 schedule_delayed_work(&gpio->work,
270 msecs_to_jiffies(gpio->debounce_time));
271
272 return IRQ_HANDLED;
273}
274
275/* gpio work */
276static void gpio_work(struct work_struct *work)
277{
278 struct snd_soc_jack_gpio *gpio;
279
280 gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
281 snd_soc_jack_gpio_detect(gpio);
282}
283
284/**
285 * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
286 *
287 * @jack: ASoC jack
288 * @count: number of pins
289 * @gpios: array of gpio pins
290 *
291 * This function will request gpio, set data direction and request irq
292 * for each gpio in the array.
293 */
294int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
295 struct snd_soc_jack_gpio *gpios)
296{
297 int i, ret;
298
299 for (i = 0; i < count; i++) {
300 if (!gpio_is_valid(gpios[i].gpio)) {
301 printk(KERN_ERR "Invalid gpio %d\n",
302 gpios[i].gpio);
303 ret = -EINVAL;
304 goto undo;
305 }
306 if (!gpios[i].name) {
307 printk(KERN_ERR "No name for gpio %d\n",
308 gpios[i].gpio);
309 ret = -EINVAL;
310 goto undo;
311 }
312
313 ret = gpio_request(gpios[i].gpio, gpios[i].name);
314 if (ret)
315 goto undo;
316
317 ret = gpio_direction_input(gpios[i].gpio);
318 if (ret)
319 goto err;
320
321 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
322 gpios[i].jack = jack;
323
324 ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
325 gpio_handler,
326 IRQF_TRIGGER_RISING |
327 IRQF_TRIGGER_FALLING,
328 gpios[i].name,
329 &gpios[i]);
330 if (ret < 0)
331 goto err;
332
333 if (gpios[i].wake) {
334 ret = irq_set_irq_wake(gpio_to_irq(gpios[i].gpio), 1);
335 if (ret != 0)
336 printk(KERN_ERR
337 "Failed to mark GPIO %d as wake source: %d\n",
338 gpios[i].gpio, ret);
339 }
340
341#ifdef CONFIG_GPIO_SYSFS
342 /* Expose GPIO value over sysfs for diagnostic purposes */
343 gpio_export(gpios[i].gpio, false);
344#endif
345
346 /* Update initial jack status */
347 snd_soc_jack_gpio_detect(&gpios[i]);
348 }
349
350 return 0;
351
352err:
353 gpio_free(gpios[i].gpio);
354undo:
355 snd_soc_jack_free_gpios(jack, i, gpios);
356
357 return ret;
358}
359EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
360
361/**
362 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
363 *
364 * @jack: ASoC jack
365 * @count: number of pins
366 * @gpios: array of gpio pins
367 *
368 * Release gpio and irq resources for gpio pins associated with an ASoC jack.
369 */
370void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
371 struct snd_soc_jack_gpio *gpios)
372{
373 int i;
374
375 for (i = 0; i < count; i++) {
376#ifdef CONFIG_GPIO_SYSFS
377 gpio_unexport(gpios[i].gpio);
378#endif
379 free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
380 cancel_delayed_work_sync(&gpios[i].work);
381 gpio_free(gpios[i].gpio);
382 gpios[i].jack = NULL;
383 }
384}
385EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
386#endif /* CONFIG_GPIOLIB */