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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"); |