2 * Jack abstraction layer
4 * Copyright 2008 Wolfson Microelectronics
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.
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.
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
22 #include <linux/input.h>
23 #include <sound/jack.h>
24 #include <sound/core.h>
26 static int snd_jack_dev_free(struct snd_device *device)
28 struct snd_jack *jack = device->device_data;
30 /* If the input device is registered with the input subsystem
31 * then we need to use a different deallocator. */
33 input_unregister_device(jack->input_dev);
35 input_free_device(jack->input_dev);
42 static int snd_jack_dev_register(struct snd_device *device)
44 struct snd_jack *jack = device->device_data;
45 struct snd_card *card = device->card;
48 snprintf(jack->name, sizeof(jack->name), "%s %s",
49 card->longname, jack->id);
50 jack->input_dev->name = jack->name;
52 /* Default to the sound card device. */
53 if (!jack->input_dev->dev.parent)
54 jack->input_dev->dev.parent = card->dev;
56 err = input_register_device(jack->input_dev);
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
69 * @jjack: Used to provide the allocated jack object to the caller.
71 * Creates a new jack object.
73 * Returns zero if successful, or a negative error code on failure.
74 * On success jjack will be initialised.
76 int snd_jack_new(struct snd_card *card, const char *id, int type,
77 struct snd_jack **jjack)
79 struct snd_jack *jack;
81 static struct snd_device_ops ops = {
82 .dev_free = snd_jack_dev_free,
83 .dev_register = snd_jack_dev_register,
86 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
92 jack->input_dev = input_allocate_device();
93 if (jack->input_dev == NULL) {
98 jack->input_dev->phys = "ALSA";
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);
109 err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
118 input_free_device(jack->input_dev);
122 EXPORT_SYMBOL(snd_jack_new);
125 * snd_jack_set_parent - Set the parent device for a jack
127 * @jack: The jack to configure
128 * @parent: The device to set as parent for the jack.
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.
134 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
136 WARN_ON(jack->registered);
138 jack->input_dev->dev.parent = parent;
140 EXPORT_SYMBOL(snd_jack_set_parent);
143 * snd_jack_report - Report the current status of a jack
145 * @jack: The jack to report status for
146 * @status: The current status of the jack
148 void snd_jack_report(struct snd_jack *jack, int status)
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);
157 input_sync(jack->input_dev);
159 EXPORT_SYMBOL(snd_jack_report);
161 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
162 MODULE_DESCRIPTION("Jack detection support for ALSA");
163 MODULE_LICENSE("GPL");