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 snd_jack_dev_free(struct snd_device *device)
  27 {
  28         struct snd_jack *jack = device->device_data;
  29
  30         /* If the input device is registered with the input subsystem
  31          * then we need to use a different deallocator. */
  32         if (jack->registered)
  33                 input_unregister_device(jack->input_dev);
  34         else
  35                 input_free_device(jack->input_dev);
  36
  37         kfree(jack->id);
  38         kfree(jack);
  39
  40         return 0;
  41 }
  42
  43 static int snd_jack_dev_register(struct snd_device *device)
  44 {
  45         struct snd_jack *jack = device->device_data;
  46         struct snd_card *card = device->card;
  47         int err;
  48
  49         snprintf(jack->name, sizeof(jack->name), "%s %s",
  50                  card->longname, jack->id);
  51         jack->input_dev->name = jack->name;
  52
  53         /* Default to the sound card device. */
  54         if (!jack->input_dev->dev.parent)
  55                 jack->input_dev->dev.parent = card->dev;
  56
  57         err = input_register_device(jack->input_dev);
  58         if (err == 0)
  59                 jack->registered = 1;
  60
  61         return err;
  62 }
  63
  64 /**
  65  * snd_jack_new - Create a new jack
  66  * @card:  the card instance
  67  * @id:    an identifying string for this jack
  68  * @type:  a bitmask of enum snd_jack_type values that can be detected by
  69  *         this jack
  70  * @jjack: Used to provide the allocated jack object to the caller.
  71  *
  72  * Creates a new jack object.
  73  *
  74  * Returns zero if successful, or a negative error code on failure.
  75  * On success jjack will be initialised.
  76  */
  77 int snd_jack_new(struct snd_card *card, const char *id, int type,
  78                  struct snd_jack **jjack)
  79 {
  80         struct snd_jack *jack;
  81         int err;
  82         static struct snd_device_ops ops = {
  83                 .dev_free = snd_jack_dev_free,
  84                 .dev_register = snd_jack_dev_register,
  85         };
  86
  87         jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
  88         if (jack == NULL)
  89                 return -ENOMEM;
  90
  91         jack->id = kstrdup(id, GFP_KERNEL);
  92
  93         jack->input_dev = input_allocate_device();
  94         if (jack->input_dev == NULL) {
  95                 err = -ENOMEM;
  96                 goto fail_input;
  97         }
  98
  99         jack->input_dev->phys = "ALSA";
 100
 101         jack->type = type;
 102
 103         if (type & SND_JACK_HEADPHONE)
 104                 input_set_capability(jack->input_dev, EV_SW,
 105                                      SW_HEADPHONE_INSERT);
 106         if (type & SND_JACK_LINEOUT)
 107                 input_set_capability(jack->input_dev, EV_SW,
 108                                      SW_LINEOUT_INSERT);
 109         if (type & SND_JACK_MICROPHONE)
 110                 input_set_capability(jack->input_dev, EV_SW,
 111                                      SW_MICROPHONE_INSERT);
 112
 113         err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
 114         if (err < 0)
 115                 goto fail_input;
 116
 117         *jjack = jack;
 118
 119         return 0;
 120
 121 fail_input:
 122         input_free_device(jack->input_dev);
 123         kfree(jack);
 124         return err;
 125 }
 126 EXPORT_SYMBOL(snd_jack_new);
 127
 128 /**
 129  * snd_jack_set_parent - Set the parent device for a jack
 130  *
 131  * @jack:   The jack to configure
 132  * @parent: The device to set as parent for the jack.
 133  *
 134  * Set the parent for the jack input device in the device tree.  This
 135  * function is only valid prior to registration of the jack.  If no
 136  * parent is configured then the parent device will be the sound card.
 137  */
 138 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 139 {
 140         WARN_ON(jack->registered);
 141
 142         jack->input_dev->dev.parent = parent;
 143 }
 144 EXPORT_SYMBOL(snd_jack_set_parent);
 145
 146 /**
 147  * snd_jack_report - Report the current status of a jack
 148  *
 149  * @jack:   The jack to report status for
 150  * @status: The current status of the jack
 151  */
 152 void snd_jack_report(struct snd_jack *jack, int status)
 153 {
 154         if (jack->type & SND_JACK_HEADPHONE)
 155                 input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
 156                                     status & SND_JACK_HEADPHONE);
 157         if (jack->type & SND_JACK_LINEOUT)
 158                 input_report_switch(jack->input_dev, SW_LINEOUT_INSERT,
 159                                     status & SND_JACK_LINEOUT);
 160         if (jack->type & SND_JACK_MICROPHONE)
 161                 input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
 162                                     status & SND_JACK_MICROPHONE);
 163
 164         input_sync(jack->input_dev);
 165 }
 166 EXPORT_SYMBOL(snd_jack_report);
 167
 168 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 169 MODULE_DESCRIPTION("Jack detection support for ALSA");
 170 MODULE_LICENSE("GPL");