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