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 (jack->private_free)
  39                 jack->private_free(jack);
  40
  41         /* If the input device is registered with the input subsystem
  42          * then we need to use a different deallocator. */
  43         if (jack->registered)
  44                 input_unregister_device(jack->input_dev);
  45         else
  46                 input_free_device(jack->input_dev);
  47
  48         kfree(jack->id);
  49         kfree(jack);
  50
  51         return 0;
  52 }
  53
  54 static int snd_jack_dev_register(struct snd_device *device)
  55 {
  56         struct snd_jack *jack = device->device_data;
  57         struct snd_card *card = device->card;
  58         int err;
  59
  60         snprintf(jack->name, sizeof(jack->name), "%s %s",
  61                  card->shortname, jack->id);
  62         jack->input_dev->name = jack->name;
  63
  64         /* Default to the sound card device. */
  65         if (!jack->input_dev->dev.parent)
  66                 jack->input_dev->dev.parent = snd_card_get_device_link(card);
  67
  68         err = input_register_device(jack->input_dev);
  69         if (err == 0)
  70                 jack->registered = 1;
  71
  72         return err;
  73 }
  74
  75 /**
  76  * snd_jack_new - Create a new jack
  77  * @card:  the card instance
  78  * @id:    an identifying string for this jack
  79  * @type:  a bitmask of enum snd_jack_type values that can be detected by
  80  *         this jack
  81  * @jjack: Used to provide the allocated jack object to the caller.
  82  *
  83  * Creates a new jack object.
  84  *
  85  * Returns zero if successful, or a negative error code on failure.
  86  * On success jjack will be initialised.
  87  */
  88 int snd_jack_new(struct snd_card *card, const char *id, int type,
  89                  struct snd_jack **jjack)
  90 {
  91         struct snd_jack *jack;
  92         int err;
  93         int i;
  94         static struct snd_device_ops ops = {
  95                 .dev_free = snd_jack_dev_free,
  96                 .dev_register = snd_jack_dev_register,
  97         };
  98
  99         jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
 100         if (jack == NULL)
 101                 return -ENOMEM;
 102
 103         jack->id = kstrdup(id, GFP_KERNEL);
 104
 105         jack->input_dev = input_allocate_device();
 106         if (jack->input_dev == NULL) {
 107                 err = -ENOMEM;
 108                 goto fail_input;
 109         }
 110
 111         jack->input_dev->phys = "ALSA";
 112
 113         jack->type = type;
 114
 115         for (i = 0; i < ARRAY_SIZE(jack_types); i++)
 116                 if (type & (1 << i))
 117                         input_set_capability(jack->input_dev, EV_SW,
 118                                              jack_types[i]);
 119
 120         err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
 121         if (err < 0)
 122                 goto fail_input;
 123
 124         *jjack = jack;
 125
 126         return 0;
 127
 128 fail_input:
 129         input_free_device(jack->input_dev);
 130         kfree(jack);
 131         return err;
 132 }
 133 EXPORT_SYMBOL(snd_jack_new);
 134
 135 /**
 136  * snd_jack_set_parent - Set the parent device for a jack
 137  *
 138  * @jack:   The jack to configure
 139  * @parent: The device to set as parent for the jack.
 140  *
 141  * Set the parent for the jack input device in the device tree.  This
 142  * function is only valid prior to registration of the jack.  If no
 143  * parent is configured then the parent device will be the sound card.
 144  */
 145 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 146 {
 147         WARN_ON(jack->registered);
 148
 149         jack->input_dev->dev.parent = parent;
 150 }
 151 EXPORT_SYMBOL(snd_jack_set_parent);
 152
 153 /**
 154  * snd_jack_report - Report the current status of a jack
 155  *
 156  * @jack:   The jack to report status for
 157  * @status: The current status of the jack
 158  */
 159 void snd_jack_report(struct snd_jack *jack, int status)
 160 {
 161         int i;
 162
 163         if (!jack)
 164                 return;
 165
 166         for (i = 0; i < ARRAY_SIZE(jack_types); i++) {
 167                 int testbit = 1 << i;
 168                 if (jack->type & testbit)
 169                         input_report_switch(jack->input_dev, jack_types[i],
 170                                             status & testbit);
 171         }
 172
 173         input_sync(jack->input_dev);
 174 }
 175 EXPORT_SYMBOL(snd_jack_report);
 176
 177 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 178 MODULE_DESCRIPTION("Jack detection support for ALSA");
 179 MODULE_LICENSE("GPL");