1 // SPDX-License-Identifier: GPL-2.0+
3 // soc-jack.c -- ALSA SoC jack handling
5 // Copyright 2008 Wolfson Microelectronics PLC.
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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>
20 struct jack_gpio_tbl {
22 struct snd_soc_jack *jack;
23 struct snd_soc_jack_gpio *gpios;
27 * snd_soc_jack_report - Report the current status for a jack
30 * @status: a bitmask of enum snd_jack_type values that are currently detected.
31 * @mask: a bitmask of enum snd_jack_type values that being reported.
33 * If configured using snd_soc_jack_add_pins() then the associated
34 * DAPM pins will be enabled or disabled as appropriate and DAPM
37 * Note: This function uses mutexes and should be called from a
38 * context which can sleep (such as a workqueue).
40 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
42 struct snd_soc_dapm_context *dapm;
43 struct snd_soc_jack_pin *pin;
44 unsigned int sync = 0;
49 trace_snd_soc_jack_report(jack, mask, status);
51 dapm = &jack->card->dapm;
53 mutex_lock(&jack->mutex);
55 jack->status &= ~mask;
56 jack->status |= status & mask;
58 trace_snd_soc_jack_notify(jack, status);
60 list_for_each_entry(pin, &jack->pins, list) {
61 enable = pin->mask & jack->status;
67 snd_soc_dapm_enable_pin(dapm, pin->pin);
69 snd_soc_dapm_disable_pin(dapm, pin->pin);
71 /* we need to sync for this case only */
75 /* Report before the DAPM sync to help users updating micbias status */
76 blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
79 snd_soc_dapm_sync(dapm);
81 snd_jack_report(jack->jack, jack->status);
83 mutex_unlock(&jack->mutex);
85 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
88 * snd_soc_jack_add_zones - Associate voltage zones with jack
91 * @count: Number of zones
92 * @zones: Array of zones
94 * After this function has been called the zones specified in the
95 * array will be associated with the jack.
97 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
98 struct snd_soc_jack_zone *zones)
102 for (i = 0; i < count; i++) {
103 INIT_LIST_HEAD(&zones[i].list);
104 list_add(&(zones[i].list), &jack->jack_zones);
108 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
111 * snd_soc_jack_get_type - Based on the mic bias value, this function returns
112 * the type of jack from the zones declared in the jack type
115 * @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
117 * Based on the mic bias value passed, this function helps identify
118 * the type of jack from the already declared jack zones
120 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
122 struct snd_soc_jack_zone *zone;
124 list_for_each_entry(zone, &jack->jack_zones, list) {
125 if (micbias_voltage >= zone->min_mv &&
126 micbias_voltage < zone->max_mv)
127 return zone->jack_type;
131 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
134 * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
137 * @count: Number of pins
138 * @pins: Array of pins
140 * After this function has been called the DAPM pins specified in the
141 * pins array will have their status updated to reflect the current
142 * state of the jack whenever the jack status is updated.
144 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
145 struct snd_soc_jack_pin *pins)
149 for (i = 0; i < count; i++) {
151 dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
156 dev_err(jack->card->dev, "ASoC: No mask for pin %d"
157 " (%s)\n", i, pins[i].pin);
161 INIT_LIST_HEAD(&pins[i].list);
162 list_add(&(pins[i].list), &jack->pins);
163 snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask);
166 /* Update to reflect the last reported status; canned jack
167 * implementations are likely to set their state before the
168 * card has an opportunity to associate pins.
170 snd_soc_jack_report(jack, 0, 0);
174 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
177 * snd_soc_jack_notifier_register - Register a notifier for jack status
180 * @nb: Notifier block to register
182 * Register for notification of the current status of the jack. Note
183 * that it is not possible to report additional jack events in the
184 * callback from the notifier, this is intended to support
185 * applications such as enabling electrical detection only when a
186 * mechanical detection event has occurred.
188 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
189 struct notifier_block *nb)
191 blocking_notifier_chain_register(&jack->notifier, nb);
193 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
196 * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
199 * @nb: Notifier block to unregister
201 * Stop notifying for status changes.
203 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
204 struct notifier_block *nb)
206 blocking_notifier_chain_unregister(&jack->notifier, nb);
208 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
210 #ifdef CONFIG_GPIOLIB
212 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
214 struct snd_soc_jack *jack = gpio->jack;
218 enable = gpiod_get_value_cansleep(gpio->desc);
223 report = gpio->report;
227 if (gpio->jack_status_check)
228 report = gpio->jack_status_check(gpio->data);
230 snd_soc_jack_report(jack, report, gpio->report);
233 /* irq handler for gpio pin */
234 static irqreturn_t gpio_handler(int irq, void *data)
236 struct snd_soc_jack_gpio *gpio = data;
237 struct device *dev = gpio->jack->card->dev;
239 trace_snd_soc_jack_irq(gpio->name);
241 if (device_may_wakeup(dev))
242 pm_wakeup_event(dev, gpio->debounce_time + 50);
244 queue_delayed_work(system_power_efficient_wq, &gpio->work,
245 msecs_to_jiffies(gpio->debounce_time));
251 static void gpio_work(struct work_struct *work)
253 struct snd_soc_jack_gpio *gpio;
255 gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
256 snd_soc_jack_gpio_detect(gpio);
259 static int snd_soc_jack_pm_notifier(struct notifier_block *nb,
260 unsigned long action, void *data)
262 struct snd_soc_jack_gpio *gpio =
263 container_of(nb, struct snd_soc_jack_gpio, pm_notifier);
266 case PM_POST_SUSPEND:
267 case PM_POST_HIBERNATION:
268 case PM_POST_RESTORE:
270 * Use workqueue so we do not have to care about running
271 * concurrently with work triggered by the interrupt handler.
273 queue_delayed_work(system_power_efficient_wq, &gpio->work, 0);
280 static void jack_free_gpios(struct snd_soc_jack *jack, int count,
281 struct snd_soc_jack_gpio *gpios)
285 for (i = 0; i < count; i++) {
286 gpiod_unexport(gpios[i].desc);
287 unregister_pm_notifier(&gpios[i].pm_notifier);
288 free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
289 cancel_delayed_work_sync(&gpios[i].work);
290 gpiod_put(gpios[i].desc);
291 gpios[i].jack = NULL;
295 static void jack_devres_free_gpios(struct device *dev, void *res)
297 struct jack_gpio_tbl *tbl = res;
299 jack_free_gpios(tbl->jack, tbl->count, tbl->gpios);
303 * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
306 * @count: number of pins
307 * @gpios: array of gpio pins
309 * This function will request gpio, set data direction and request irq
310 * for each gpio in the array.
312 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
313 struct snd_soc_jack_gpio *gpios)
316 struct jack_gpio_tbl *tbl;
318 tbl = devres_alloc(jack_devres_free_gpios, sizeof(*tbl), GFP_KERNEL);
325 for (i = 0; i < count; i++) {
326 if (!gpios[i].name) {
327 dev_err(jack->card->dev,
328 "ASoC: No name for gpio at index %d\n", i);
334 /* Already have a GPIO descriptor. */
336 } else if (gpios[i].gpiod_dev) {
337 /* Get a GPIO descriptor */
338 gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
340 gpios[i].idx, GPIOD_IN);
341 if (IS_ERR(gpios[i].desc)) {
342 ret = PTR_ERR(gpios[i].desc);
343 dev_err(gpios[i].gpiod_dev,
344 "ASoC: Cannot get gpio at index %d: %d",
349 /* legacy GPIO number */
350 if (!gpio_is_valid(gpios[i].gpio)) {
351 dev_err(jack->card->dev,
352 "ASoC: Invalid gpio %d\n",
358 ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
363 gpios[i].desc = gpio_to_desc(gpios[i].gpio);
366 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
367 gpios[i].jack = jack;
369 ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
371 IRQF_TRIGGER_RISING |
372 IRQF_TRIGGER_FALLING,
379 ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
381 dev_err(jack->card->dev,
382 "ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
387 * Register PM notifier so we do not miss state transitions
388 * happening while system is asleep.
390 gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier;
391 register_pm_notifier(&gpios[i].pm_notifier);
393 /* Expose GPIO value over sysfs for diagnostic purposes */
394 gpiod_export(gpios[i].desc, false);
396 /* Update initial jack status */
397 schedule_delayed_work(&gpios[i].work,
398 msecs_to_jiffies(gpios[i].debounce_time));
401 devres_add(jack->card->dev, tbl);
405 gpio_free(gpios[i].gpio);
407 jack_free_gpios(jack, i, gpios);
412 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
415 * snd_soc_jack_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
417 * @gpiod_dev: GPIO consumer device
419 * @count: number of pins
420 * @gpios: array of gpio pins
422 * This function will request gpio, set data direction and request irq
423 * for each gpio in the array.
425 int snd_soc_jack_add_gpiods(struct device *gpiod_dev,
426 struct snd_soc_jack *jack,
427 int count, struct snd_soc_jack_gpio *gpios)
431 for (i = 0; i < count; i++)
432 gpios[i].gpiod_dev = gpiod_dev;
434 return snd_soc_jack_add_gpios(jack, count, gpios);
436 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);
439 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
442 * @count: number of pins
443 * @gpios: array of gpio pins
445 * Release gpio and irq resources for gpio pins associated with an ASoC jack.
447 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
448 struct snd_soc_jack_gpio *gpios)
450 jack_free_gpios(jack, count, gpios);
451 devres_destroy(jack->card->dev, jack_devres_free_gpios, NULL, NULL);
453 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
454 #endif /* CONFIG_GPIOLIB */