Merge branch 'topic/jack-mechanical' into to-push
[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->id);
38         kfree(jack);
39
40         return 0;
41 }
42
43 static 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  */
77 int 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
91         jack->id = kstrdup(id, GFP_KERNEL);
92
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);
106         if (type & SND_JACK_LINEOUT)
107                 input_set_capability(jack->input_dev, EV_SW,
108                                      SW_LINEOUT_INSERT);
109         if (type & SND_JACK_MICROPHONE)
110                 input_set_capability(jack->input_dev, EV_SW,
111                                      SW_MICROPHONE_INSERT);
112         if (type & SND_JACK_MECHANICAL)
113                 input_set_capability(jack->input_dev, EV_SW,
114                                      SW_JACK_PHYSICAL_INSERT);
115
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
124 fail_input:
125         input_free_device(jack->input_dev);
126         kfree(jack);
127         return err;
128 }
129 EXPORT_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  */
141 void 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 }
147 EXPORT_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  */
155 void snd_jack_report(struct snd_jack *jack, int status)
156 {
157         if (!jack)
158                 return;
159
160         if (jack->type & SND_JACK_HEADPHONE)
161                 input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
162                                     status & SND_JACK_HEADPHONE);
163         if (jack->type & SND_JACK_LINEOUT)
164                 input_report_switch(jack->input_dev, SW_LINEOUT_INSERT,
165                                     status & SND_JACK_LINEOUT);
166         if (jack->type & SND_JACK_MICROPHONE)
167                 input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
168                                     status & SND_JACK_MICROPHONE);
169         if (jack->type & SND_JACK_MECHANICAL)
170                 input_report_switch(jack->input_dev, SW_JACK_PHYSICAL_INSERT,
171                                     status & SND_JACK_MECHANICAL);
172
173         input_sync(jack->input_dev);
174 }
175 EXPORT_SYMBOL(snd_jack_report);
176
177 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
178 MODULE_DESCRIPTION("Jack detection support for ALSA");
179 MODULE_LICENSE("GPL");