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Linux/sound/soc/soc-jack.c

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  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 <linux/export.h>
 21 #include <trace/events/asoc.h>
 22 
 23 /**
 24  * snd_soc_jack_new - Create a new jack
 25  * @codec: ASoC codec
 26  * @id:    an identifying string for this jack
 27  * @type:  a bitmask of enum snd_jack_type values that can be detected by
 28  *         this jack
 29  * @jack:  structure to use for the jack
 30  *
 31  * Creates a new jack object.
 32  *
 33  * Returns zero if successful, or a negative error code on failure.
 34  * On success jack will be initialised.
 35  */
 36 int snd_soc_jack_new(struct snd_soc_codec *codec, const char *id, int type,
 37                      struct snd_soc_jack *jack)
 38 {
 39         mutex_init(&jack->mutex);
 40         jack->codec = codec;
 41         INIT_LIST_HEAD(&jack->pins);
 42         INIT_LIST_HEAD(&jack->jack_zones);
 43         BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
 44 
 45         return snd_jack_new(codec->card->snd_card, id, type, &jack->jack);
 46 }
 47 EXPORT_SYMBOL_GPL(snd_soc_jack_new);
 48 
 49 /**
 50  * snd_soc_jack_report - Report the current status for a jack
 51  *
 52  * @jack:   the 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.
 55  *
 56  * If configured using snd_soc_jack_add_pins() then the associated
 57  * DAPM pins will be enabled or disabled as appropriate and DAPM
 58  * synchronised.
 59  *
 60  * Note: This function uses mutexes and should be called from a
 61  * context which can sleep (such as a workqueue).
 62  */
 63 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
 64 {
 65         struct snd_soc_codec *codec;
 66         struct snd_soc_dapm_context *dapm;
 67         struct snd_soc_jack_pin *pin;
 68         int enable;
 69         int oldstatus;
 70 
 71         trace_snd_soc_jack_report(jack, mask, status);
 72 
 73         if (!jack)
 74                 return;
 75 
 76         codec = jack->codec;
 77         dapm =  &codec->dapm;
 78 
 79         mutex_lock(&jack->mutex);
 80 
 81         oldstatus = jack->status;
 82 
 83         jack->status &= ~mask;
 84         jack->status |= status & mask;
 85 
 86         trace_snd_soc_jack_notify(jack, status);
 87 
 88         list_for_each_entry(pin, &jack->pins, list) {
 89                 enable = pin->mask & jack->status;
 90 
 91                 if (pin->invert)
 92                         enable = !enable;
 93 
 94                 if (enable)
 95                         snd_soc_dapm_enable_pin(dapm, pin->pin);
 96                 else
 97                         snd_soc_dapm_disable_pin(dapm, pin->pin);
 98         }
 99 
100         /* Report before the DAPM sync to help users updating micbias status */
101         blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
102 
103         snd_soc_dapm_sync(dapm);
104 
105         snd_jack_report(jack->jack, jack->status);
106 
107         mutex_unlock(&jack->mutex);
108 }
109 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
110 
111 /**
112  * snd_soc_jack_add_zones - Associate voltage zones with jack
113  *
114  * @jack:  ASoC jack
115  * @count: Number of zones
116  * @zone:  Array of zones
117  *
118  * After this function has been called the zones specified in the
119  * array will be associated with the jack.
120  */
121 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
122                           struct snd_soc_jack_zone *zones)
123 {
124         int i;
125 
126         for (i = 0; i < count; i++) {
127                 INIT_LIST_HEAD(&zones[i].list);
128                 list_add(&(zones[i].list), &jack->jack_zones);
129         }
130         return 0;
131 }
132 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
133 
134 /**
135  * snd_soc_jack_get_type - Based on the mic bias value, this function returns
136  * the type of jack from the zones declared in the jack type
137  *
138  * @jack:  ASoC jack
139  * @micbias_voltage:  mic bias voltage at adc channel when jack is plugged in
140  *
141  * Based on the mic bias value passed, this function helps identify
142  * the type of jack from the already declared jack zones
143  */
144 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
145 {
146         struct snd_soc_jack_zone *zone;
147 
148         list_for_each_entry(zone, &jack->jack_zones, list) {
149                 if (micbias_voltage >= zone->min_mv &&
150                         micbias_voltage < zone->max_mv)
151                                 return zone->jack_type;
152         }
153         return 0;
154 }
155 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
156 
157 /**
158  * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
159  *
160  * @jack:  ASoC jack
161  * @count: Number of pins
162  * @pins:  Array of pins
163  *
164  * After this function has been called the DAPM pins specified in the
165  * pins array will have their status updated to reflect the current
166  * state of the jack whenever the jack status is updated.
167  */
168 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
169                           struct snd_soc_jack_pin *pins)
170 {
171         int i;
172 
173         for (i = 0; i < count; i++) {
174                 if (!pins[i].pin) {
175                         printk(KERN_ERR "No name for pin %d\n", i);
176                         return -EINVAL;
177                 }
178                 if (!pins[i].mask) {
179                         printk(KERN_ERR "No mask for pin %d (%s)\n", i,
180                                pins[i].pin);
181                         return -EINVAL;
182                 }
183 
184                 INIT_LIST_HEAD(&pins[i].list);
185                 list_add(&(pins[i].list), &jack->pins);
186         }
187 
188         snd_soc_dapm_new_widgets(&jack->codec->card->dapm);
189 
190         /* Update to reflect the last reported status; canned jack
191          * implementations are likely to set their state before the
192          * card has an opportunity to associate pins.
193          */
194         snd_soc_jack_report(jack, 0, 0);
195 
196         return 0;
197 }
198 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
199 
200 /**
201  * snd_soc_jack_notifier_register - Register a notifier for jack status
202  *
203  * @jack:  ASoC jack
204  * @nb:    Notifier block to register
205  *
206  * Register for notification of the current status of the jack.  Note
207  * that it is not possible to report additional jack events in the
208  * callback from the notifier, this is intended to support
209  * applications such as enabling electrical detection only when a
210  * mechanical detection event has occurred.
211  */
212 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
213                                     struct notifier_block *nb)
214 {
215         blocking_notifier_chain_register(&jack->notifier, nb);
216 }
217 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
218 
219 /**
220  * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
221  *
222  * @jack:  ASoC jack
223  * @nb:    Notifier block to unregister
224  *
225  * Stop notifying for status changes.
226  */
227 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
228                                       struct notifier_block *nb)
229 {
230         blocking_notifier_chain_unregister(&jack->notifier, nb);
231 }
232 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
233 
234 #ifdef CONFIG_GPIOLIB
235 /* gpio detect */
236 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
237 {
238         struct snd_soc_jack *jack = gpio->jack;
239         int enable;
240         int report;
241 
242         enable = gpio_get_value_cansleep(gpio->gpio);
243         if (gpio->invert)
244                 enable = !enable;
245 
246         if (enable)
247                 report = gpio->report;
248         else
249                 report = 0;
250 
251         if (gpio->jack_status_check)
252                 report = gpio->jack_status_check();
253 
254         snd_soc_jack_report(jack, report, gpio->report);
255 }
256 
257 /* irq handler for gpio pin */
258 static irqreturn_t gpio_handler(int irq, void *data)
259 {
260         struct snd_soc_jack_gpio *gpio = data;
261         struct device *dev = gpio->jack->codec->card->dev;
262 
263         trace_snd_soc_jack_irq(gpio->name);
264 
265         if (device_may_wakeup(dev))
266                 pm_wakeup_event(dev, gpio->debounce_time + 50);
267 
268         schedule_delayed_work(&gpio->work,
269                               msecs_to_jiffies(gpio->debounce_time));
270 
271         return IRQ_HANDLED;
272 }
273 
274 /* gpio work */
275 static void gpio_work(struct work_struct *work)
276 {
277         struct snd_soc_jack_gpio *gpio;
278 
279         gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
280         snd_soc_jack_gpio_detect(gpio);
281 }
282 
283 /**
284  * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
285  *
286  * @jack:  ASoC jack
287  * @count: number of pins
288  * @gpios: array of gpio pins
289  *
290  * This function will request gpio, set data direction and request irq
291  * for each gpio in the array.
292  */
293 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
294                         struct snd_soc_jack_gpio *gpios)
295 {
296         int i, ret;
297 
298         for (i = 0; i < count; i++) {
299                 if (!gpio_is_valid(gpios[i].gpio)) {
300                         printk(KERN_ERR "Invalid gpio %d\n",
301                                 gpios[i].gpio);
302                         ret = -EINVAL;
303                         goto undo;
304                 }
305                 if (!gpios[i].name) {
306                         printk(KERN_ERR "No name for gpio %d\n",
307                                 gpios[i].gpio);
308                         ret = -EINVAL;
309                         goto undo;
310                 }
311 
312                 ret = gpio_request(gpios[i].gpio, gpios[i].name);
313                 if (ret)
314                         goto undo;
315 
316                 ret = gpio_direction_input(gpios[i].gpio);
317                 if (ret)
318                         goto err;
319 
320                 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
321                 gpios[i].jack = jack;
322 
323                 ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
324                                               gpio_handler,
325                                               IRQF_TRIGGER_RISING |
326                                               IRQF_TRIGGER_FALLING,
327                                               gpios[i].name,
328                                               &gpios[i]);
329                 if (ret < 0)
330                         goto err;
331 
332                 if (gpios[i].wake) {
333                         ret = irq_set_irq_wake(gpio_to_irq(gpios[i].gpio), 1);
334                         if (ret != 0)
335                                 printk(KERN_ERR
336                                   "Failed to mark GPIO %d as wake source: %d\n",
337                                         gpios[i].gpio, ret);
338                 }
339 
340                 /* Expose GPIO value over sysfs for diagnostic purposes */
341                 gpio_export(gpios[i].gpio, false);
342 
343                 /* Update initial jack status */
344                 snd_soc_jack_gpio_detect(&gpios[i]);
345         }
346 
347         return 0;
348 
349 err:
350         gpio_free(gpios[i].gpio);
351 undo:
352         snd_soc_jack_free_gpios(jack, i, gpios);
353 
354         return ret;
355 }
356 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
357 
358 /**
359  * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
360  *
361  * @jack:  ASoC jack
362  * @count: number of pins
363  * @gpios: array of gpio pins
364  *
365  * Release gpio and irq resources for gpio pins associated with an ASoC jack.
366  */
367 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
368                         struct snd_soc_jack_gpio *gpios)
369 {
370         int i;
371 
372         for (i = 0; i < count; i++) {
373                 gpio_unexport(gpios[i].gpio);
374                 free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
375                 cancel_delayed_work_sync(&gpios[i].work);
376                 gpio_free(gpios[i].gpio);
377                 gpios[i].jack = NULL;
378         }
379 }
380 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
381 #endif  /* CONFIG_GPIOLIB */
382 

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