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Mark Brown8a2cd612009-01-07 17:31:10 +00001/*
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>
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -060016#include <linux/gpio.h>
17#include <linux/interrupt.h>
18#include <linux/workqueue.h>
19#include <linux/delay.h>
Mark Brown3028eb82010-12-05 12:22:46 +000020#include <trace/events/asoc.h>
Mark Brown8a2cd612009-01-07 17:31:10 +000021
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 */
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +000035int snd_soc_jack_new(struct snd_soc_codec *codec, const char *id, int type,
Mark Brown8a2cd612009-01-07 17:31:10 +000036 struct snd_soc_jack *jack)
37{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +000038 jack->codec = codec;
Mark Brown8a2cd612009-01-07 17:31:10 +000039 INIT_LIST_HEAD(&jack->pins);
Vinod Koulfa9879e2011-02-09 14:44:17 +053040 INIT_LIST_HEAD(&jack->jack_zones);
Mark Brownd5021ec2010-03-22 12:06:30 +000041 BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
Mark Brown8a2cd612009-01-07 17:31:10 +000042
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +000043 return snd_jack_new(codec->card->snd_card, id, type, &jack->jack);
Mark Brown8a2cd612009-01-07 17:31:10 +000044}
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{
Julia Lawall4f066172009-10-17 08:32:56 +020063 struct snd_soc_codec *codec;
Liam Girdwoodce6120c2010-11-05 15:53:46 +020064 struct snd_soc_dapm_context *dapm;
Mark Brown8a2cd612009-01-07 17:31:10 +000065 struct snd_soc_jack_pin *pin;
66 int enable;
67 int oldstatus;
68
Mark Brown3028eb82010-12-05 12:22:46 +000069 trace_snd_soc_jack_report(jack, mask, status);
70
Mark Brown3a278a02010-03-29 20:31:14 +010071 if (!jack)
Mark Brown8a2cd612009-01-07 17:31:10 +000072 return;
Mark Brown3a278a02010-03-29 20:31:14 +010073
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +000074 codec = jack->codec;
Liam Girdwoodce6120c2010-11-05 15:53:46 +020075 dapm = &codec->dapm;
Mark Brown8a2cd612009-01-07 17:31:10 +000076
77 mutex_lock(&codec->mutex);
78
79 oldstatus = jack->status;
80
81 jack->status &= ~mask;
Janusz Krzysztofik178b6992009-07-24 02:48:57 +020082 jack->status |= status & mask;
Mark Brown8a2cd612009-01-07 17:31:10 +000083
Janusz Krzysztofik178b6992009-07-24 02:48:57 +020084 /* 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))
Mark Brown8a2cd612009-01-07 17:31:10 +000087 goto out;
88
Mark Brown3028eb82010-12-05 12:22:46 +000089 trace_snd_soc_jack_notify(jack, status);
90
Mark Brown8a2cd612009-01-07 17:31:10 +000091 list_for_each_entry(pin, &jack->pins, list) {
Janusz Krzysztofik178b6992009-07-24 02:48:57 +020092 enable = pin->mask & jack->status;
Mark Brown8a2cd612009-01-07 17:31:10 +000093
94 if (pin->invert)
95 enable = !enable;
96
97 if (enable)
Liam Girdwoodce6120c2010-11-05 15:53:46 +020098 snd_soc_dapm_enable_pin(dapm, pin->pin);
Mark Brown8a2cd612009-01-07 17:31:10 +000099 else
Liam Girdwoodce6120c2010-11-05 15:53:46 +0200100 snd_soc_dapm_disable_pin(dapm, pin->pin);
Mark Brown8a2cd612009-01-07 17:31:10 +0000101 }
102
Mark Brownd5021ec2010-03-22 12:06:30 +0000103 /* Report before the DAPM sync to help users updating micbias status */
104 blocking_notifier_call_chain(&jack->notifier, status, NULL);
105
Liam Girdwoodce6120c2010-11-05 15:53:46 +0200106 snd_soc_dapm_sync(dapm);
Mark Brown8a2cd612009-01-07 17:31:10 +0000107
108 snd_jack_report(jack->jack, status);
109
110out:
111 mutex_unlock(&codec->mutex);
112}
113EXPORT_SYMBOL_GPL(snd_soc_jack_report);
114
115/**
Vinod Koulfa9879e2011-02-09 14:44:17 +0530116 * 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/**
Mark Brown8a2cd612009-01-07 17:31:10 +0000161 * 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);
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600200
Mark Brownd5021ec2010-03-22 12:06:30 +0000201/**
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
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600235#ifdef CONFIG_GPIOLIB
236/* gpio detect */
Mark Brown26bd7b42009-03-06 11:32:17 +0000237static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600238{
239 struct snd_soc_jack *jack = gpio->jack;
240 int enable;
241 int report;
242
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600243 enable = gpio_get_value(gpio->gpio);
244 if (gpio->invert)
245 enable = !enable;
246
247 if (enable)
248 report = gpio->report;
249 else
250 report = 0;
251
Joonyoung Shimc871a052009-11-12 17:14:04 +0900252 if (gpio->jack_status_check)
253 report = gpio->jack_status_check();
254
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600255 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;
Mark Brownf9a67052010-11-14 19:25:09 +0000262 struct device *dev = gpio->jack->codec->card->dev;
263
Mark Brown3028eb82010-12-05 12:22:46 +0000264 trace_snd_soc_jack_irq(gpio->name);
265
Mark Brownf9a67052010-11-14 19:25:09 +0000266 if (device_may_wakeup(dev))
267 pm_wakeup_event(dev, gpio->debounce_time + 50);
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600268
Mark Brown4c14d782010-10-06 15:54:28 -0700269 schedule_delayed_work(&gpio->work,
270 msecs_to_jiffies(gpio->debounce_time));
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600271
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
Mark Brown4c14d782010-10-06 15:54:28 -0700280 gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600281 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
Mark Brown4c14d782010-10-06 15:54:28 -0700321 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
Lars-Peter Clausenb8e22c12009-07-31 21:15:25 +0200322 gpios[i].jack = jack;
323
Mark Brown3f58fd82010-11-03 09:35:31 -0400324 ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
325 gpio_handler,
326 IRQF_TRIGGER_RISING |
327 IRQF_TRIGGER_FALLING,
328 jack->codec->dev->driver->name,
329 &gpios[i]);
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600330 if (ret)
331 goto err;
332
Janusz Krzysztofik178b6992009-07-24 02:48:57 +0200333#ifdef CONFIG_GPIO_SYSFS
334 /* Expose GPIO value over sysfs for diagnostic purposes */
335 gpio_export(gpios[i].gpio, false);
336#endif
337
Janusz Krzysztofik178b6992009-07-24 02:48:57 +0200338 /* Update initial jack status */
339 snd_soc_jack_gpio_detect(&gpios[i]);
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600340 }
341
342 return 0;
343
344err:
345 gpio_free(gpios[i].gpio);
346undo:
347 snd_soc_jack_free_gpios(jack, i, gpios);
348
349 return ret;
350}
351EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
352
353/**
354 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
355 *
356 * @jack: ASoC jack
357 * @count: number of pins
358 * @gpios: array of gpio pins
359 *
360 * Release gpio and irq resources for gpio pins associated with an ASoC jack.
361 */
362void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
363 struct snd_soc_jack_gpio *gpios)
364{
365 int i;
366
367 for (i = 0; i < count; i++) {
Janusz Krzysztofik178b6992009-07-24 02:48:57 +0200368#ifdef CONFIG_GPIO_SYSFS
369 gpio_unexport(gpios[i].gpio);
370#endif
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600371 free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
Mark Brown4c14d782010-10-06 15:54:28 -0700372 cancel_delayed_work_sync(&gpios[i].work);
Lopez Cruz, Misaelec676242009-03-03 15:25:04 -0600373 gpio_free(gpios[i].gpio);
374 gpios[i].jack = NULL;
375 }
376}
377EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
378#endif /* CONFIG_GPIOLIB */