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Mark Browne76d8ce2008-07-28 19:05:35 +01001/*
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
Matthew Ranostay282cd762008-10-25 01:05:29 -040037 kfree(jack->id);
Mark Browne76d8ce2008-07-28 19:05:35 +010038 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->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 */
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
Matthew Ranostay282cd762008-10-25 01:05:29 -040091 jack->id = kstrdup(id, GFP_KERNEL);
Mark Browne76d8ce2008-07-28 19:05:35 +010092
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);
Matthew Ranostaya53ccab2008-10-25 01:05:04 -0400106 if (type & SND_JACK_LINEOUT)
107 input_set_capability(jack->input_dev, EV_SW,
108 SW_LINEOUT_INSERT);
Mark Browne76d8ce2008-07-28 19:05:35 +0100109 if (type & SND_JACK_MICROPHONE)
110 input_set_capability(jack->input_dev, EV_SW,
111 SW_MICROPHONE_INSERT);
Mark Browncdc69362008-12-10 13:55:49 +0000112 if (type & SND_JACK_MECHANICAL)
113 input_set_capability(jack->input_dev, EV_SW,
114 SW_JACK_PHYSICAL_INSERT);
Mark Browne76d8ce2008-07-28 19:05:35 +0100115
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{
Mark Brown9a3f3712008-10-15 17:07:47 +0100157 if (!jack)
158 return;
159
Mark Browne76d8ce2008-07-28 19:05:35 +0100160 if (jack->type & SND_JACK_HEADPHONE)
161 input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
162 status & SND_JACK_HEADPHONE);
Matthew Ranostaya53ccab2008-10-25 01:05:04 -0400163 if (jack->type & SND_JACK_LINEOUT)
164 input_report_switch(jack->input_dev, SW_LINEOUT_INSERT,
165 status & SND_JACK_LINEOUT);
Mark Browne76d8ce2008-07-28 19:05:35 +0100166 if (jack->type & SND_JACK_MICROPHONE)
167 input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
168 status & SND_JACK_MICROPHONE);
Mark Browncdc69362008-12-10 13:55:49 +0000169 if (jack->type & SND_JACK_MECHANICAL)
170 input_report_switch(jack->input_dev, SW_JACK_PHYSICAL_INSERT,
171 status & SND_JACK_MECHANICAL);
Mark Browne76d8ce2008-07-28 19:05:35 +0100172
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");