nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / sound / core / jack.c
blob53b53e97c8960e4415b7c45801d5368cb611690c
1 /*
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 <linux/slab.h>
24 #include <sound/jack.h>
25 #include <sound/core.h>
27 static int jack_switch_types[] = {
28 SW_HEADPHONE_INSERT,
29 SW_MICROPHONE_INSERT,
30 SW_LINEOUT_INSERT,
31 SW_JACK_PHYSICAL_INSERT,
32 SW_VIDEOOUT_INSERT,
35 static int snd_jack_dev_free(struct snd_device *device)
37 struct snd_jack *jack = device->device_data;
39 if (jack->private_free)
40 jack->private_free(jack);
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);
49 kfree(jack->id);
50 kfree(jack);
52 return 0;
55 static int snd_jack_dev_register(struct snd_device *device)
57 struct snd_jack *jack = device->device_data;
58 struct snd_card *card = device->card;
59 int err, i;
61 snprintf(jack->name, sizeof(jack->name), "%s %s",
62 card->shortname, jack->id);
63 jack->input_dev->name = jack->name;
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);
69 /* Add capabilities for any keys that are enabled */
70 for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
71 int testbit = SND_JACK_BTN_0 >> i;
73 if (!(jack->type & testbit))
74 continue;
76 if (!jack->key[i])
77 jack->key[i] = BTN_0 + i;
79 input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
82 err = input_register_device(jack->input_dev);
83 if (err == 0)
84 jack->registered = 1;
86 return err;
89 /**
90 * snd_jack_new - Create a new jack
91 * @card: the card instance
92 * @id: an identifying string for this jack
93 * @type: a bitmask of enum snd_jack_type values that can be detected by
94 * this jack
95 * @jjack: Used to provide the allocated jack object to the caller.
97 * Creates a new jack object.
99 * Returns zero if successful, or a negative error code on failure.
100 * On success jjack will be initialised.
102 int snd_jack_new(struct snd_card *card, const char *id, int type,
103 struct snd_jack **jjack)
105 struct snd_jack *jack;
106 int err;
107 int i;
108 static struct snd_device_ops ops = {
109 .dev_free = snd_jack_dev_free,
110 .dev_register = snd_jack_dev_register,
113 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
114 if (jack == NULL)
115 return -ENOMEM;
117 jack->id = kstrdup(id, GFP_KERNEL);
119 jack->input_dev = input_allocate_device();
120 if (jack->input_dev == NULL) {
121 err = -ENOMEM;
122 goto fail_input;
125 jack->input_dev->phys = "ALSA";
127 jack->type = type;
129 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++)
130 if (type & (1 << i))
131 input_set_capability(jack->input_dev, EV_SW,
132 jack_switch_types[i]);
134 err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
135 if (err < 0)
136 goto fail_input;
138 *jjack = jack;
140 return 0;
142 fail_input:
143 input_free_device(jack->input_dev);
144 kfree(jack->id);
145 kfree(jack);
146 return err;
148 EXPORT_SYMBOL(snd_jack_new);
151 * snd_jack_set_parent - Set the parent device for a jack
153 * @jack: The jack to configure
154 * @parent: The device to set as parent for the jack.
156 * Set the parent for the jack input device in the device tree. This
157 * function is only valid prior to registration of the jack. If no
158 * parent is configured then the parent device will be the sound card.
160 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
162 WARN_ON(jack->registered);
164 jack->input_dev->dev.parent = parent;
166 EXPORT_SYMBOL(snd_jack_set_parent);
169 * snd_jack_set_key - Set a key mapping on a jack
171 * @jack: The jack to configure
172 * @type: Jack report type for this key
173 * @keytype: Input layer key type to be reported
175 * Map a SND_JACK_BTN_ button type to an input layer key, allowing
176 * reporting of keys on accessories via the jack abstraction. If no
177 * mapping is provided but keys are enabled in the jack type then
178 * BTN_n numeric buttons will be reported.
180 * Note that this is intended to be use by simple devices with small
181 * numbers of keys that can be reported. It is also possible to
182 * access the input device directly - devices with complex input
183 * capabilities on accessories should consider doing this rather than
184 * using this abstraction.
186 * This function may only be called prior to registration of the jack.
188 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
189 int keytype)
191 int key = fls(SND_JACK_BTN_0) - fls(type);
193 WARN_ON(jack->registered);
195 if (!keytype || key >= ARRAY_SIZE(jack->key))
196 return -EINVAL;
198 jack->type |= type;
199 jack->key[key] = keytype;
201 return 0;
203 EXPORT_SYMBOL(snd_jack_set_key);
206 * snd_jack_report - Report the current status of a jack
208 * @jack: The jack to report status for
209 * @status: The current status of the jack
211 void snd_jack_report(struct snd_jack *jack, int status)
213 int i;
215 if (!jack)
216 return;
218 for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
219 int testbit = SND_JACK_BTN_0 >> i;
221 if (jack->type & testbit)
222 input_report_key(jack->input_dev, jack->key[i],
223 status & testbit);
226 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
227 int testbit = 1 << i;
228 if (jack->type & testbit)
229 input_report_switch(jack->input_dev,
230 jack_switch_types[i],
231 status & testbit);
234 input_sync(jack->input_dev);
236 EXPORT_SYMBOL(snd_jack_report);
238 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
239 MODULE_DESCRIPTION("Jack detection support for ALSA");
240 MODULE_LICENSE("GPL");