Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arjan/linux...
[sfrench/cifs-2.6.git] / 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 <sound/jack.h>
24 #include <sound/core.h>
25
26 static 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
42 static 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  */
76 int 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
117 fail_input:
118         input_free_device(jack->input_dev);
119         kfree(jack);
120         return err;
121 }
122 EXPORT_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  */
134 void 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 }
140 EXPORT_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  */
148 void snd_jack_report(struct snd_jack *jack, int status)
149 {
150         if (jack->type & SND_JACK_HEADPHONE)
151                 input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
152                                     status & SND_JACK_HEADPHONE);
153         if (jack->type & SND_JACK_MICROPHONE)
154                 input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
155                                     status & SND_JACK_MICROPHONE);
156
157         input_sync(jack->input_dev);
158 }
159 EXPORT_SYMBOL(snd_jack_report);
160
161 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
162 MODULE_DESCRIPTION("Jack detection support for ALSA");
163 MODULE_LICENSE("GPL");