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