sound/soc/soc-jack.c

   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  * @card:  ASoC card
  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         jack->codec = codec;
  40         INIT_LIST_HEAD(&jack->pins);
  41         INIT_LIST_HEAD(&jack->jack_zones);
  42         BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
  43
  44         return snd_jack_new(codec->card->snd_card, id, type, &jack->jack);
  45 }
  46 EXPORT_SYMBOL_GPL(snd_soc_jack_new);
  47
  48 /**
  49  * snd_soc_jack_report - Report the current status for a jack
  50  *
  51  * @jack:   the jack
  52  * @status: a bitmask of enum snd_jack_type values that are currently detected.
  53  * @mask:   a bitmask of enum snd_jack_type values that being reported.
  54  *
  55  * If configured using snd_soc_jack_add_pins() then the associated
  56  * DAPM pins will be enabled or disabled as appropriate and DAPM
  57  * synchronised.
  58  *
  59  * Note: This function uses mutexes and should be called from a
  60  * context which can sleep (such as a workqueue).
  61  */
  62 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
  63 {
  64         struct snd_soc_codec *codec;
  65         struct snd_soc_dapm_context *dapm;
  66         struct snd_soc_jack_pin *pin;
  67         int enable;
  68         int oldstatus;
  69
  70         trace_snd_soc_jack_report(jack, mask, status);
  71
  72         if (!jack)
  73                 return;
  74
  75         codec = jack->codec;
  76         dapm =  &codec->dapm;
  77
  78         mutex_lock(&codec->mutex);
  79
  80         oldstatus = jack->status;
  81
  82         jack->status &= ~mask;
  83         jack->status |= status & mask;
  84
  85         /* The DAPM sync is expensive enough to be worth skipping.
  86          * However, empty mask means pin synchronization is desired. */
  87         if (mask && (jack->status == oldstatus))
  88                 goto out;
  89
  90         trace_snd_soc_jack_notify(jack, status);
  91
  92         list_for_each_entry(pin, &jack->pins, list) {
  93                 enable = pin->mask & jack->status;
  94
  95                 if (pin->invert)
  96                         enable = !enable;
  97
  98                 if (enable)
  99                         snd_soc_dapm_enable_pin(dapm, pin->pin);
 100                 else
 101                         snd_soc_dapm_disable_pin(dapm, pin->pin);
 102         }
 103
 104         /* Report before the DAPM sync to help users updating micbias status */
 105         blocking_notifier_call_chain(&jack->notifier, status, jack);
 106
 107         snd_soc_dapm_sync(dapm);
 108
 109         snd_jack_report(jack->jack, jack->status);
 110
 111 out:
 112         mutex_unlock(&codec->mutex);
 113 }
 114 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
 115
 116 /**
 117  * snd_soc_jack_add_zones - Associate voltage zones with jack
 118  *
 119  * @jack:  ASoC jack
 120  * @count: Number of zones
 121  * @zone:  Array of zones
 122  *
 123  * After this function has been called the zones specified in the
 124  * array will be associated with the jack.
 125  */
 126 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
 127                           struct snd_soc_jack_zone *zones)
 128 {
 129         int i;
 130
 131         for (i = 0; i < count; i++) {
 132                 INIT_LIST_HEAD(&zones[i].list);
 133                 list_add(&(zones[i].list), &jack->jack_zones);
 134         }
 135         return 0;
 136 }
 137 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
 138
 139 /**
 140  * snd_soc_jack_get_type - Based on the mic bias value, this function returns
 141  * the type of jack from the zones delcared in the jack type
 142  *
 143  * @micbias_voltage:  mic bias voltage at adc channel when jack is plugged in
 144  *
 145  * Based on the mic bias value passed, this function helps identify
 146  * the type of jack from the already delcared jack zones
 147  */
 148 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
 149 {
 150         struct snd_soc_jack_zone *zone;
 151
 152         list_for_each_entry(zone, &jack->jack_zones, list) {
 153                 if (micbias_voltage >= zone->min_mv &&
 154                         micbias_voltage < zone->max_mv)
 155                                 return zone->jack_type;
 156         }
 157         return 0;
 158 }
 159 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
 160
 161 /**
 162  * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
 163  *
 164  * @jack:  ASoC jack
 165  * @count: Number of pins
 166  * @pins:  Array of pins
 167  *
 168  * After this function has been called the DAPM pins specified in the
 169  * pins array will have their status updated to reflect the current
 170  * state of the jack whenever the jack status is updated.
 171  */
 172 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
 173                           struct snd_soc_jack_pin *pins)
 174 {
 175         int i;
 176
 177         for (i = 0; i < count; i++) {
 178                 if (!pins[i].pin) {
 179                         printk(KERN_ERR "No name for pin %d\n", i);
 180                         return -EINVAL;
 181                 }
 182                 if (!pins[i].mask) {
 183                         printk(KERN_ERR "No mask for pin %d (%s)\n", i,
 184                                pins[i].pin);
 185                         return -EINVAL;
 186                 }
 187
 188                 INIT_LIST_HEAD(&pins[i].list);
 189                 list_add(&(pins[i].list), &jack->pins);
 190         }
 191
 192         snd_soc_dapm_new_widgets(&jack->codec->card->dapm);
 193
 194         /* Update to reflect the last reported status; canned jack
 195          * implementations are likely to set their state before the
 196          * card has an opportunity to associate pins.
 197          */
 198         snd_soc_jack_report(jack, 0, 0);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
 203
 204 /**
 205  * snd_soc_jack_notifier_register - Register a notifier for jack status
 206  *
 207  * @jack:  ASoC jack
 208  * @nb:    Notifier block to register
 209  *
 210  * Register for notification of the current status of the jack.  Note
 211  * that it is not possible to report additional jack events in the
 212  * callback from the notifier, this is intended to support
 213  * applications such as enabling electrical detection only when a
 214  * mechanical detection event has occurred.
 215  */
 216 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
 217                                     struct notifier_block *nb)
 218 {
 219         blocking_notifier_chain_register(&jack->notifier, nb);
 220 }
 221 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
 222
 223 /**
 224  * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
 225  *
 226  * @jack:  ASoC jack
 227  * @nb:    Notifier block to unregister
 228  *
 229  * Stop notifying for status changes.
 230  */
 231 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
 232                                       struct notifier_block *nb)
 233 {
 234         blocking_notifier_chain_unregister(&jack->notifier, nb);
 235 }
 236 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
 237
 238 #ifdef CONFIG_GPIOLIB
 239 /* gpio detect */
 240 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
 241 {
 242         struct snd_soc_jack *jack = gpio->jack;
 243         int enable;
 244         int report;
 245
 246         enable = gpio_get_value_cansleep(gpio->gpio);
 247         if (gpio->invert)
 248                 enable = !enable;
 249
 250         if (enable)
 251                 report = gpio->report;
 252         else
 253                 report = 0;
 254
 255         if (gpio->jack_status_check)
 256                 report = gpio->jack_status_check();
 257
 258         snd_soc_jack_report(jack, report, gpio->report);
 259 }
 260
 261 /* irq handler for gpio pin */
 262 static irqreturn_t gpio_handler(int irq, void *data)
 263 {
 264         struct snd_soc_jack_gpio *gpio = data;
 265         struct device *dev = gpio->jack->codec->card->dev;
 266
 267         trace_snd_soc_jack_irq(gpio->name);
 268
 269         if (device_may_wakeup(dev))
 270                 pm_wakeup_event(dev, gpio->debounce_time + 50);
 271
 272         schedule_delayed_work(&gpio->work,
 273                               msecs_to_jiffies(gpio->debounce_time));
 274
 275         return IRQ_HANDLED;
 276 }
 277
 278 /* gpio work */
 279 static void gpio_work(struct work_struct *work)
 280 {
 281         struct snd_soc_jack_gpio *gpio;
 282
 283         gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
 284         snd_soc_jack_gpio_detect(gpio);
 285 }
 286
 287 /**
 288  * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
 289  *
 290  * @jack:  ASoC jack
 291  * @count: number of pins
 292  * @gpios: array of gpio pins
 293  *
 294  * This function will request gpio, set data direction and request irq
 295  * for each gpio in the array.
 296  */
 297 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
 298                         struct snd_soc_jack_gpio *gpios)
 299 {
 300         int i, ret;
 301
 302         for (i = 0; i < count; i++) {
 303                 if (!gpio_is_valid(gpios[i].gpio)) {
 304                         printk(KERN_ERR "Invalid gpio %d\n",
 305                                 gpios[i].gpio);
 306                         ret = -EINVAL;
 307                         goto undo;
 308                 }
 309                 if (!gpios[i].name) {
 310                         printk(KERN_ERR "No name for gpio %d\n",
 311                                 gpios[i].gpio);
 312                         ret = -EINVAL;
 313                         goto undo;
 314                 }
 315
 316                 ret = gpio_request(gpios[i].gpio, gpios[i].name);
 317                 if (ret)
 318                         goto undo;
 319
 320                 ret = gpio_direction_input(gpios[i].gpio);
 321                 if (ret)
 322                         goto err;
 323
 324                 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
 325                 gpios[i].jack = jack;
 326
 327                 ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
 328                                               gpio_handler,
 329                                               IRQF_TRIGGER_RISING |
 330                                               IRQF_TRIGGER_FALLING,
 331                                               gpios[i].name,
 332                                               &gpios[i]);
 333                 if (ret < 0)
 334                         goto err;
 335
 336                 if (gpios[i].wake) {
 337                         ret = irq_set_irq_wake(gpio_to_irq(gpios[i].gpio), 1);
 338                         if (ret != 0)
 339                                 printk(KERN_ERR
 340                                   "Failed to mark GPIO %d as wake source: %d\n",
 341                                         gpios[i].gpio, ret);
 342                 }
 343
 344                 /* Expose GPIO value over sysfs for diagnostic purposes */
 345                 gpio_export(gpios[i].gpio, false);
 346
 347                 /* Update initial jack status */
 348                 snd_soc_jack_gpio_detect(&gpios[i]);
 349         }
 350
 351         return 0;
 352
 353 err:
 354         gpio_free(gpios[i].gpio);
 355 undo:
 356         snd_soc_jack_free_gpios(jack, i, gpios);
 357
 358         return ret;
 359 }
 360 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
 361
 362 /**
 363  * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
 364  *
 365  * @jack:  ASoC jack
 366  * @count: number of pins
 367  * @gpios: array of gpio pins
 368  *
 369  * Release gpio and irq resources for gpio pins associated with an ASoC jack.
 370  */
 371 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 372                         struct snd_soc_jack_gpio *gpios)
 373 {
 374         int i;
 375
 376         for (i = 0; i < count; i++) {
 377                 gpio_unexport(gpios[i].gpio);
 378                 free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
 379                 cancel_delayed_work_sync(&gpios[i].work);
 380                 gpio_free(gpios[i].gpio);
 381                 gpios[i].jack = NULL;
 382         }
 383 }
 384 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
 385 #endif  /* CONFIG_GPIOLIB */