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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 <linux/slab.h> |
24 | #include <sound/jack.h> |
25 | #include <sound/core.h> |
26 | |
27 | static int jack_types[] = { |
28 | SW_HEADPHONE_INSERT, |
29 | SW_MICROPHONE_INSERT, |
30 | SW_LINEOUT_INSERT, |
31 | SW_JACK_PHYSICAL_INSERT, |
32 | SW_VIDEOOUT_INSERT, |
33 | }; |
34 | |
35 | static int snd_jack_dev_free(struct snd_device *device) |
36 | { |
37 | struct snd_jack *jack = device->device_data; |
38 | |
39 | if (jack->private_free) |
40 | jack->private_free(jack); |
41 | |
42 | /* If the input device is registered with the input subsystem |
43 | * then we need to use a different deallocator. */ |
44 | if (jack->registered) |
45 | input_unregister_device(jack->input_dev); |
46 | else |
47 | input_free_device(jack->input_dev); |
48 | |
49 | kfree(jack->id); |
50 | kfree(jack); |
51 | |
52 | return 0; |
53 | } |
54 | |
55 | static int snd_jack_dev_register(struct snd_device *device) |
56 | { |
57 | struct snd_jack *jack = device->device_data; |
58 | struct snd_card *card = device->card; |
59 | int err; |
60 | |
61 | snprintf(jack->name, sizeof(jack->name), "%s %s", |
62 | card->shortname, jack->id); |
63 | jack->input_dev->name = jack->name; |
64 | |
65 | /* Default to the sound card device. */ |
66 | if (!jack->input_dev->dev.parent) |
67 | jack->input_dev->dev.parent = snd_card_get_device_link(card); |
68 | |
69 | err = input_register_device(jack->input_dev); |
70 | if (err == 0) |
71 | jack->registered = 1; |
72 | |
73 | return err; |
74 | } |
75 | |
76 | /** |
77 | * snd_jack_new - Create a new jack |
78 | * @card: the card instance |
79 | * @id: an identifying string for this jack |
80 | * @type: a bitmask of enum snd_jack_type values that can be detected by |
81 | * this jack |
82 | * @jjack: Used to provide the allocated jack object to the caller. |
83 | * |
84 | * Creates a new jack object. |
85 | * |
86 | * Returns zero if successful, or a negative error code on failure. |
87 | * On success jjack will be initialised. |
88 | */ |
89 | int snd_jack_new(struct snd_card *card, const char *id, int type, |
90 | struct snd_jack **jjack) |
91 | { |
92 | struct snd_jack *jack; |
93 | int err; |
94 | int i; |
95 | static struct snd_device_ops ops = { |
96 | .dev_free = snd_jack_dev_free, |
97 | .dev_register = snd_jack_dev_register, |
98 | }; |
99 | |
100 | jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL); |
101 | if (jack == NULL) |
102 | return -ENOMEM; |
103 | |
104 | jack->id = kstrdup(id, GFP_KERNEL); |
105 | |
106 | jack->input_dev = input_allocate_device(); |
107 | if (jack->input_dev == NULL) { |
108 | err = -ENOMEM; |
109 | goto fail_input; |
110 | } |
111 | |
112 | jack->input_dev->phys = "ALSA"; |
113 | |
114 | jack->type = type; |
115 | |
116 | for (i = 0; i < ARRAY_SIZE(jack_types); i++) |
117 | if (type & (1 << i)) |
118 | input_set_capability(jack->input_dev, EV_SW, |
119 | jack_types[i]); |
120 | |
121 | err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops); |
122 | if (err < 0) |
123 | goto fail_input; |
124 | |
125 | *jjack = jack; |
126 | |
127 | return 0; |
128 | |
129 | fail_input: |
130 | input_free_device(jack->input_dev); |
131 | kfree(jack); |
132 | return err; |
133 | } |
134 | EXPORT_SYMBOL(snd_jack_new); |
135 | |
136 | /** |
137 | * snd_jack_set_parent - Set the parent device for a jack |
138 | * |
139 | * @jack: The jack to configure |
140 | * @parent: The device to set as parent for the jack. |
141 | * |
142 | * Set the parent for the jack input device in the device tree. This |
143 | * function is only valid prior to registration of the jack. If no |
144 | * parent is configured then the parent device will be the sound card. |
145 | */ |
146 | void snd_jack_set_parent(struct snd_jack *jack, struct device *parent) |
147 | { |
148 | WARN_ON(jack->registered); |
149 | |
150 | jack->input_dev->dev.parent = parent; |
151 | } |
152 | EXPORT_SYMBOL(snd_jack_set_parent); |
153 | |
154 | /** |
155 | * snd_jack_report - Report the current status of a jack |
156 | * |
157 | * @jack: The jack to report status for |
158 | * @status: The current status of the jack |
159 | */ |
160 | void snd_jack_report(struct snd_jack *jack, int status) |
161 | { |
162 | int i; |
163 | |
164 | if (!jack) |
165 | return; |
166 | |
167 | for (i = 0; i < ARRAY_SIZE(jack_types); i++) { |
168 | int testbit = 1 << i; |
169 | if (jack->type & testbit) |
170 | input_report_switch(jack->input_dev, jack_types[i], |
171 | status & testbit); |
172 | } |
173 | |
174 | input_sync(jack->input_dev); |
175 | } |
176 | EXPORT_SYMBOL(snd_jack_report); |
177 | |
178 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
179 | MODULE_DESCRIPTION("Jack detection support for ALSA"); |
180 | MODULE_LICENSE("GPL"); |
181 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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