jack.c revision 9d59065cd6fae841ca56c281189d5b8d0817d35f 
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 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
34static 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
54static 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 = card->dev;
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 */
88int 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
128fail_input:
129	input_free_device(jack->input_dev);
130	kfree(jack);
131	return err;
132}
133EXPORT_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 */
145void 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}
151EXPORT_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 */
159void 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}
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