2 * soc-jack.c -- ALSA SoC jack handling
4 * Copyright 2008 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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 <linux/export.h>
21 #include <trace/events/asoc.h>
24 * snd_soc_jack_new - Create a new jack
26 * @id: an identifying string for this jack
27 * @type: a bitmask of enum snd_jack_type values that can be detected by
29 * @jack: structure to use for the jack
31 * Creates a new jack object.
33 * Returns zero if successful, or a negative error code on failure.
34 * On success jack will be initialised.
36 int snd_soc_jack_new(struct snd_soc_codec *codec, const char *id, int type,
37 struct snd_soc_jack *jack)
39 mutex_init(&jack->mutex);
41 INIT_LIST_HEAD(&jack->pins);
42 INIT_LIST_HEAD(&jack->jack_zones);
43 BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
45 return snd_jack_new(codec->card->snd_card, id, type, &jack->jack);
47 EXPORT_SYMBOL_GPL(snd_soc_jack_new);
50 * snd_soc_jack_report - Report the current status for a jack
53 * @status: a bitmask of enum snd_jack_type values that are currently detected.
54 * @mask: a bitmask of enum snd_jack_type values that being reported.
56 * If configured using snd_soc_jack_add_pins() then the associated
57 * DAPM pins will be enabled or disabled as appropriate and DAPM
60 * Note: This function uses mutexes and should be called from a
61 * context which can sleep (such as a workqueue).
63 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
65 struct snd_soc_codec *codec;
66 struct snd_soc_dapm_context *dapm;
67 struct snd_soc_jack_pin *pin;
68 unsigned int sync = 0;
71 trace_snd_soc_jack_report(jack, mask, status);
79 mutex_lock(&jack->mutex);
81 jack->status &= ~mask;
82 jack->status |= status & mask;
84 trace_snd_soc_jack_notify(jack, status);
86 list_for_each_entry(pin, &jack->pins, list) {
87 enable = pin->mask & jack->status;
93 snd_soc_dapm_enable_pin(dapm, pin->pin);
95 snd_soc_dapm_disable_pin(dapm, pin->pin);
97 /* we need to sync for this case only */
101 /* Report before the DAPM sync to help users updating micbias status */
102 blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
105 snd_soc_dapm_sync(dapm);
107 snd_jack_report(jack->jack, jack->status);
109 mutex_unlock(&jack->mutex);
111 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
114 * snd_soc_jack_add_zones - Associate voltage zones with jack
117 * @count: Number of zones
118 * @zone: Array of zones
120 * After this function has been called the zones specified in the
121 * array will be associated with the jack.
123 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
124 struct snd_soc_jack_zone *zones)
128 for (i = 0; i < count; i++) {
129 INIT_LIST_HEAD(&zones[i].list);
130 list_add(&(zones[i].list), &jack->jack_zones);
134 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
137 * snd_soc_jack_get_type - Based on the mic bias value, this function returns
138 * the type of jack from the zones declared in the jack type
141 * @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
143 * Based on the mic bias value passed, this function helps identify
144 * the type of jack from the already declared jack zones
146 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
148 struct snd_soc_jack_zone *zone;
150 list_for_each_entry(zone, &jack->jack_zones, list) {
151 if (micbias_voltage >= zone->min_mv &&
152 micbias_voltage < zone->max_mv)
153 return zone->jack_type;
157 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
160 * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
163 * @count: Number of pins
164 * @pins: Array of pins
166 * After this function has been called the DAPM pins specified in the
167 * pins array will have their status updated to reflect the current
168 * state of the jack whenever the jack status is updated.
170 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
171 struct snd_soc_jack_pin *pins)
175 for (i = 0; i < count; i++) {
177 dev_err(jack->codec->dev, "ASoC: No name for pin %d\n",
182 dev_err(jack->codec->dev, "ASoC: No mask for pin %d"
183 " (%s)\n", i, pins[i].pin);
187 INIT_LIST_HEAD(&pins[i].list);
188 list_add(&(pins[i].list), &jack->pins);
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.
195 snd_soc_jack_report(jack, 0, 0);
199 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
202 * snd_soc_jack_notifier_register - Register a notifier for jack status
205 * @nb: Notifier block to register
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.
213 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
214 struct notifier_block *nb)
216 blocking_notifier_chain_register(&jack->notifier, nb);
218 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
221 * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
224 * @nb: Notifier block to unregister
226 * Stop notifying for status changes.
228 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
229 struct notifier_block *nb)
231 blocking_notifier_chain_unregister(&jack->notifier, nb);
233 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
235 #ifdef CONFIG_GPIOLIB
237 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
239 struct snd_soc_jack *jack = gpio->jack;
243 enable = gpio_get_value_cansleep(gpio->gpio);
248 report = gpio->report;
252 if (gpio->jack_status_check)
253 report = gpio->jack_status_check();
255 snd_soc_jack_report(jack, report, gpio->report);
258 /* irq handler for gpio pin */
259 static irqreturn_t gpio_handler(int irq, void *data)
261 struct snd_soc_jack_gpio *gpio = data;
262 struct device *dev = gpio->jack->codec->card->dev;
264 trace_snd_soc_jack_irq(gpio->name);
266 if (device_may_wakeup(dev))
267 pm_wakeup_event(dev, gpio->debounce_time + 50);
269 queue_delayed_work(system_power_efficient_wq, &gpio->work,
270 msecs_to_jiffies(gpio->debounce_time));
276 static void gpio_work(struct work_struct *work)
278 struct snd_soc_jack_gpio *gpio;
280 gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
281 snd_soc_jack_gpio_detect(gpio);
285 * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
288 * @count: number of pins
289 * @gpios: array of gpio pins
291 * This function will request gpio, set data direction and request irq
292 * for each gpio in the array.
294 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
295 struct snd_soc_jack_gpio *gpios)
299 for (i = 0; i < count; i++) {
300 if (!gpio_is_valid(gpios[i].gpio)) {
301 dev_err(jack->codec->dev, "ASoC: Invalid gpio %d\n",
306 if (!gpios[i].name) {
307 dev_err(jack->codec->dev, "ASoC: No name for gpio %d\n",
313 ret = gpio_request(gpios[i].gpio, gpios[i].name);
317 ret = gpio_direction_input(gpios[i].gpio);
321 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
322 gpios[i].jack = jack;
324 ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
326 IRQF_TRIGGER_RISING |
327 IRQF_TRIGGER_FALLING,
334 ret = irq_set_irq_wake(gpio_to_irq(gpios[i].gpio), 1);
336 dev_err(jack->codec->dev, "ASoC: "
337 "Failed to mark GPIO %d as wake source: %d\n",
341 /* Expose GPIO value over sysfs for diagnostic purposes */
342 gpio_export(gpios[i].gpio, false);
344 /* Update initial jack status */
345 snd_soc_jack_gpio_detect(&gpios[i]);
351 gpio_free(gpios[i].gpio);
353 snd_soc_jack_free_gpios(jack, i, gpios);
357 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
360 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
363 * @count: number of pins
364 * @gpios: array of gpio pins
366 * Release gpio and irq resources for gpio pins associated with an ASoC jack.
368 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
369 struct snd_soc_jack_gpio *gpios)
373 for (i = 0; i < count; i++) {
374 gpio_unexport(gpios[i].gpio);
375 free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
376 cancel_delayed_work_sync(&gpios[i].work);
377 gpio_free(gpios[i].gpio);
378 gpios[i].jack = NULL;
381 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
382 #endif /* CONFIG_GPIOLIB */