linux/sound/core/jack.c
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   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
  26static 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
  43static 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->shortname, 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 */
  77int 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        if (type & SND_JACK_MECHANICAL)
 113                input_set_capability(jack->input_dev, EV_SW,
 114                                     SW_JACK_PHYSICAL_INSERT);
 115
 116        err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
 117        if (err < 0)
 118                goto fail_input;
 119
 120        *jjack = jack;
 121
 122        return 0;
 123
 124fail_input:
 125        input_free_device(jack->input_dev);
 126        kfree(jack);
 127        return err;
 128}
 129EXPORT_SYMBOL(snd_jack_new);
 130
 131/**
 132 * snd_jack_set_parent - Set the parent device for a jack
 133 *
 134 * @jack:   The jack to configure
 135 * @parent: The device to set as parent for the jack.
 136 *
 137 * Set the parent for the jack input device in the device tree.  This
 138 * function is only valid prior to registration of the jack.  If no
 139 * parent is configured then the parent device will be the sound card.
 140 */
 141void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 142{
 143        WARN_ON(jack->registered);
 144
 145        jack->input_dev->dev.parent = parent;
 146}
 147EXPORT_SYMBOL(snd_jack_set_parent);
 148
 149/**
 150 * snd_jack_report - Report the current status of a jack
 151 *
 152 * @jack:   The jack to report status for
 153 * @status: The current status of the jack
 154 */
 155void snd_jack_report(struct snd_jack *jack, int status)
 156{
 157        if (!jack)
 158                return;
 159
 160        if (jack->type & SND_JACK_HEADPHONE)
 161                input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
 162                                    status & SND_JACK_HEADPHONE);
 163        if (jack->type & SND_JACK_LINEOUT)
 164                input_report_switch(jack->input_dev, SW_LINEOUT_INSERT,
 165                                    status & SND_JACK_LINEOUT);
 166        if (jack->type & SND_JACK_MICROPHONE)
 167                input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
 168                                    status & SND_JACK_MICROPHONE);
 169        if (jack->type & SND_JACK_MECHANICAL)
 170                input_report_switch(jack->input_dev, SW_JACK_PHYSICAL_INSERT,
 171                                    status & SND_JACK_MECHANICAL);
 172
 173        input_sync(jack->input_dev);
 174}
 175EXPORT_SYMBOL(snd_jack_report);
 176
 177MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 178MODULE_DESCRIPTION("Jack detection support for ALSA");
 179MODULE_LICENSE("GPL");
 180