/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 <linux/slab.h>
 24#include <sound/jack.h>
 25#include <sound/core.h>
 26
 27static int jack_types[] = {
 28	SW_HEADPHONE_INSERT,
 29	SW_MICROPHONE_INSERT,
 30	SW_LINEOUT_INSERT,
 31	SW_JACK_PHYSICAL_INSERT,
 32	SW_VIDEOOUT_INSERT,
 33};
 34
 35static int snd_jack_dev_free(struct snd_device *device)
 36{
 37	struct snd_jack *jack = device->device_data;
 38
 39	if (jack->private_free)
 40		jack->private_free(jack);
 41
 42	/* If the input device is registered with the input subsystem
 43	 * then we need to use a different deallocator. */
 44	if (jack->registered)
 45		input_unregister_device(jack->input_dev);
 46	else
 47		input_free_device(jack->input_dev);
 48
 49	kfree(jack->id);
 50	kfree(jack);
 51
 52	return 0;
 53}
 54
 55static int snd_jack_dev_register(struct snd_device *device)
 56{
 57	struct snd_jack *jack = device->device_data;
 58	struct snd_card *card = device->card;
 59	int err;
 60
 61	snprintf(jack->name, sizeof(jack->name), "%s %s",
 62		 card->shortname, jack->id);
 63	jack->input_dev->name = jack->name;
 64
 65	/* Default to the sound card device. */
 66	if (!jack->input_dev->dev.parent)
 67		jack->input_dev->dev.parent = snd_card_get_device_link(card);
 68
 69	err = input_register_device(jack->input_dev);
 70	if (err == 0)
 71		jack->registered = 1;
 72
 73	return err;
 74}
 75
 76/**
 77 * snd_jack_new - Create a new jack
 78 * @card:  the card instance
 79 * @id:    an identifying string for this jack
 80 * @type:  a bitmask of enum snd_jack_type values that can be detected by
 81 *         this jack
 82 * @jjack: Used to provide the allocated jack object to the caller.
 83 *
 84 * Creates a new jack object.
 85 *
 86 * Returns zero if successful, or a negative error code on failure.
 87 * On success jjack will be initialised.
 88 */
 89int snd_jack_new(struct snd_card *card, const char *id, int type,
 90		 struct snd_jack **jjack)
 91{
 92	struct snd_jack *jack;
 93	int err;
 94	int i;
 95	static struct snd_device_ops ops = {
 96		.dev_free = snd_jack_dev_free,
 97		.dev_register = snd_jack_dev_register,
 98	};
 99
100	jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
101	if (jack == NULL)
102		return -ENOMEM;
103
104	jack->id = kstrdup(id, GFP_KERNEL);
105
106	jack->input_dev = input_allocate_device();
107	if (jack->input_dev == NULL) {
108		err = -ENOMEM;
109		goto fail_input;
110	}
111
112	jack->input_dev->phys = "ALSA";
113
114	jack->type = type;
115
116	for (i = 0; i < ARRAY_SIZE(jack_types); i++)
117		if (type & (1 << i))
118			input_set_capability(jack->input_dev, EV_SW,
119					     jack_types[i]);
120
121	err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
122	if (err < 0)
123		goto fail_input;
124
125	*jjack = jack;
126
127	return 0;
128
129fail_input:
130	input_free_device(jack->input_dev);
131	kfree(jack);
132	return err;
133}
134EXPORT_SYMBOL(snd_jack_new);
135
136/**
137 * snd_jack_set_parent - Set the parent device for a jack
138 *
139 * @jack:   The jack to configure
140 * @parent: The device to set as parent for the jack.
141 *
142 * Set the parent for the jack input device in the device tree.  This
143 * function is only valid prior to registration of the jack.  If no
144 * parent is configured then the parent device will be the sound card.
145 */
146void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
147{
148	WARN_ON(jack->registered);
149
150	jack->input_dev->dev.parent = parent;
151}
152EXPORT_SYMBOL(snd_jack_set_parent);
153
154/**
155 * snd_jack_report - Report the current status of a jack
156 *
157 * @jack:   The jack to report status for
158 * @status: The current status of the jack
159 */
160void snd_jack_report(struct snd_jack *jack, int status)
161{
162	int i;
163
164	if (!jack)
165		return;
166
167	for (i = 0; i < ARRAY_SIZE(jack_types); i++) {
168		int testbit = 1 << i;
169		if (jack->type & testbit)
170			input_report_switch(jack->input_dev, jack_types[i],
171					    status & testbit);
172	}
173
174	input_sync(jack->input_dev);
175}
176EXPORT_SYMBOL(snd_jack_report);
177
178MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
179MODULE_DESCRIPTION("Jack detection support for ALSA");
180MODULE_LICENSE("GPL");