sound/core/jack.c

   1 /*
   2  *  Jack abstraction layer
   3  *
   4  *  Copyright 2008 Wolfson Microelectronics
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/input.h>
  23 #include <sound/jack.h>
  24 #include <sound/core.h>
  25
  26 static int jack_types[] = {
  27         SW_HEADPHONE_INSERT,
  28         SW_MICROPHONE_INSERT,
  29         SW_LINEOUT_INSERT,
  30         SW_JACK_PHYSICAL_INSERT,
  31         SW_VIDEOOUT_INSERT,
  32 };
  33
  34 static int snd_jack_dev_free(struct snd_device *device)
  35 {
  36         struct snd_jack *jack = device->device_data;
  37
  38         /* If the input device is registered with the input subsystem
  39          * then we need to use a different deallocator. */
  40         if (jack->registered)
  41                 input_unregister_device(jack->input_dev);
  42         else
  43                 input_free_device(jack->input_dev);
  44
  45         kfree(jack->id);
  46         kfree(jack);
  47
  48         return 0;
  49 }
  50
  51 static int snd_jack_dev_register(struct snd_device *device)
  52 {
  53         struct snd_jack *jack = device->device_data;
  54         struct snd_card *card = device->card;
  55         int err;
  56
  57         snprintf(jack->name, sizeof(jack->name), "%s %s",
  58                  card->shortname, jack->id);
  59         jack->input_dev->name = jack->name;
  60
  61         /* Default to the sound card device. */
  62         if (!jack->input_dev->dev.parent)
  63                 jack->input_dev->dev.parent = card->dev;
  64
  65         err = input_register_device(jack->input_dev);
  66         if (err == 0)
  67                 jack->registered = 1;
  68
  69         return err;
  70 }
  71
  72 /**
  73  * snd_jack_new - Create a new jack
  74  * @card:  the card instance
  75  * @id:    an identifying string for this jack
  76  * @type:  a bitmask of enum snd_jack_type values that can be detected by
  77  *         this jack
  78  * @jjack: Used to provide the allocated jack object to the caller.
  79  *
  80  * Creates a new jack object.
  81  *
  82  * Returns zero if successful, or a negative error code on failure.
  83  * On success jjack will be initialised.
  84  */
  85 int snd_jack_new(struct snd_card *card, const char *id, int type,
  86                  struct snd_jack **jjack)
  87 {
  88         struct snd_jack *jack;
  89         int err;
  90         int i;
  91         static struct snd_device_ops ops = {
  92                 .dev_free = snd_jack_dev_free,
  93                 .dev_register = snd_jack_dev_register,
  94         };
  95
  96         jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
  97         if (jack == NULL)
  98                 return -ENOMEM;
  99
 100         jack->id = kstrdup(id, GFP_KERNEL);
 101
 102         jack->input_dev = input_allocate_device();
 103         if (jack->input_dev == NULL) {
 104                 err = -ENOMEM;
 105                 goto fail_input;
 106         }
 107
 108         jack->input_dev->phys = "ALSA";
 109
 110         jack->type = type;
 111
 112         for (i = 0; i < ARRAY_SIZE(jack_types); i++)
 113                 if (type & (1 << i))
 114                         input_set_capability(jack->input_dev, EV_SW,
 115                                              jack_types[i]);
 116
 117         err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
 118         if (err < 0)
 119                 goto fail_input;
 120
 121         *jjack = jack;
 122
 123         return 0;
 124
 125 fail_input:
 126         input_free_device(jack->input_dev);
 127         kfree(jack);
 128         return err;
 129 }
 130 EXPORT_SYMBOL(snd_jack_new);
 131
 132 /**
 133  * snd_jack_set_parent - Set the parent device for a jack
 134  *
 135  * @jack:   The jack to configure
 136  * @parent: The device to set as parent for the jack.
 137  *
 138  * Set the parent for the jack input device in the device tree.  This
 139  * function is only valid prior to registration of the jack.  If no
 140  * parent is configured then the parent device will be the sound card.
 141  */
 142 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 143 {
 144         WARN_ON(jack->registered);
 145
 146         jack->input_dev->dev.parent = parent;
 147 }
 148 EXPORT_SYMBOL(snd_jack_set_parent);
 149
 150 /**
 151  * snd_jack_report - Report the current status of a jack
 152  *
 153  * @jack:   The jack to report status for
 154  * @status: The current status of the jack
 155  */
 156 void snd_jack_report(struct snd_jack *jack, int status)
 157 {
 158         int i;
 159
 160         if (!jack)
 161                 return;
 162
 163         for (i = 0; i < ARRAY_SIZE(jack_types); i++) {
 164                 int testbit = 1 << i;
 165                 if (jack->type & testbit)
 166                         input_report_switch(jack->input_dev, jack_types[i],
 167                                             status & testbit);
 168         }
 169
 170         input_sync(jack->input_dev);
 171 }
 172 EXPORT_SYMBOL(snd_jack_report);
 173
 174 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 175 MODULE_DESCRIPTION("Jack detection support for ALSA");
 176 MODULE_LICENSE("GPL");