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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
37 kfree(jack);
38
39 return 0;
40}
41
42static int snd_jack_dev_register(struct snd_device *device)
43{
44 struct snd_jack *jack = device->device_data;
45 struct snd_card *card = device->card;
46 int err;
47
48 snprintf(jack->name, sizeof(jack->name), "%s %s",
49 card->longname, jack->id);
50 jack->input_dev->name = jack->name;
51
52 /* Default to the sound card device. */
53 if (!jack->input_dev->dev.parent)
54 jack->input_dev->dev.parent = card->dev;
55
56 err = input_register_device(jack->input_dev);
57 if (err == 0)
58 jack->registered = 1;
59
60 return err;
61}
62
63/**
64 * snd_jack_new - Create a new jack
65 * @card: the card instance
66 * @id: an identifying string for this jack
67 * @type: a bitmask of enum snd_jack_type values that can be detected by
68 * this jack
69 * @jjack: Used to provide the allocated jack object to the caller.
70 *
71 * Creates a new jack object.
72 *
73 * Returns zero if successful, or a negative error code on failure.
74 * On success jjack will be initialised.
75 */
76int snd_jack_new(struct snd_card *card, const char *id, int type,
77 struct snd_jack **jjack)
78{
79 struct snd_jack *jack;
80 int err;
81 static struct snd_device_ops ops = {
82 .dev_free = snd_jack_dev_free,
83 .dev_register = snd_jack_dev_register,
84 };
85
86 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
87 if (jack == NULL)
88 return -ENOMEM;
89
90 jack->id = id;
91
92 jack->input_dev = input_allocate_device();
93 if (jack->input_dev == NULL) {
94 err = -ENOMEM;
95 goto fail_input;
96 }
97
98 jack->input_dev->phys = "ALSA";
99
100 jack->type = type;
101
102 if (type & SND_JACK_HEADPHONE)
103 input_set_capability(jack->input_dev, EV_SW,
104 SW_HEADPHONE_INSERT);
105 if (type & SND_JACK_MICROPHONE)
106 input_set_capability(jack->input_dev, EV_SW,
107 SW_MICROPHONE_INSERT);
108
109 err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
110 if (err < 0)
111 goto fail_input;
112
113 *jjack = jack;
114
115 return 0;
116
117fail_input:
118 input_free_device(jack->input_dev);
119 kfree(jack);
120 return err;
121}
122EXPORT_SYMBOL(snd_jack_new);
123
124/**
125 * snd_jack_set_parent - Set the parent device for a jack
126 *
127 * @jack: The jack to configure
128 * @parent: The device to set as parent for the jack.
129 *
130 * Set the parent for the jack input device in the device tree. This
131 * function is only valid prior to registration of the jack. If no
132 * parent is configured then the parent device will be the sound card.
133 */
134void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
135{
136 WARN_ON(jack->registered);
137
138 jack->input_dev->dev.parent = parent;
139}
140EXPORT_SYMBOL(snd_jack_set_parent);
141
142/**
143 * snd_jack_report - Report the current status of a jack
144 *
145 * @jack: The jack to report status for
146 * @status: The current status of the jack
147 */
148void snd_jack_report(struct snd_jack *jack, int status)
149{
Mark Brown9a3f3712008-10-15 17:07:47 +0100150 if (!jack)
151 return;
152
Mark Browne76d8ce2008-07-28 19:05:35 +0100153 if (jack->type & SND_JACK_HEADPHONE)
154 input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
155 status & SND_JACK_HEADPHONE);
156 if (jack->type & SND_JACK_MICROPHONE)
157 input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
158 status & SND_JACK_MICROPHONE);
159
160 input_sync(jack->input_dev);
161}
162EXPORT_SYMBOL(snd_jack_report);
163
164MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
165MODULE_DESCRIPTION("Jack detection support for ALSA");
166MODULE_LICENSE("GPL");