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 <linux/module.h>
25 #include <sound/jack.h>
26 #include <sound/core.h>
27 #include <sound/control.h>
29 struct snd_jack_kctl {
30 struct snd_kcontrol *kctl;
31 struct list_head list; /* list of controls belong to the same jack */
32 unsigned int mask_bits; /* only masked status bits are reported via kctl */
35 static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
39 SW_JACK_PHYSICAL_INSERT,
44 static int snd_jack_dev_disconnect(struct snd_device *device)
46 struct snd_jack *jack = device->device_data;
51 /* If the input device is registered with the input subsystem
52 * then we need to use a different deallocator. */
54 input_unregister_device(jack->input_dev);
56 input_free_device(jack->input_dev);
57 jack->input_dev = NULL;
61 static int snd_jack_dev_free(struct snd_device *device)
63 struct snd_jack *jack = device->device_data;
64 struct snd_card *card = device->card;
65 struct snd_jack_kctl *jack_kctl, *tmp_jack_kctl;
67 list_for_each_entry_safe(jack_kctl, tmp_jack_kctl, &jack->kctl_list, list) {
68 list_del_init(&jack_kctl->list);
69 snd_ctl_remove(card, jack_kctl->kctl);
71 if (jack->private_free)
72 jack->private_free(jack);
74 snd_jack_dev_disconnect(device);
82 static int snd_jack_dev_register(struct snd_device *device)
84 struct snd_jack *jack = device->device_data;
85 struct snd_card *card = device->card;
88 snprintf(jack->name, sizeof(jack->name), "%s %s",
89 card->shortname, jack->id);
90 jack->input_dev->name = jack->name;
92 /* Default to the sound card device. */
93 if (!jack->input_dev->dev.parent)
94 jack->input_dev->dev.parent = snd_card_get_device_link(card);
96 /* Add capabilities for any keys that are enabled */
97 for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
98 int testbit = SND_JACK_BTN_0 >> i;
100 if (!(jack->type & testbit))
104 jack->key[i] = BTN_0 + i;
106 input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
109 err = input_register_device(jack->input_dev);
111 jack->registered = 1;
116 static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
118 struct snd_jack_kctl *jack_kctl;
120 jack_kctl = kctl->private_data;
122 list_del(&jack_kctl->list);
127 static void snd_jack_kctl_add(struct snd_jack *jack, struct snd_jack_kctl *jack_kctl)
129 list_add_tail(&jack_kctl->list, &jack->kctl_list);
132 static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const char *name, unsigned int mask)
134 struct snd_kcontrol *kctl;
135 struct snd_jack_kctl *jack_kctl;
138 kctl = snd_kctl_jack_new(name, card);
142 err = snd_ctl_add(card, kctl);
146 jack_kctl = kzalloc(sizeof(*jack_kctl), GFP_KERNEL);
151 jack_kctl->kctl = kctl;
152 jack_kctl->mask_bits = mask;
154 kctl->private_data = jack_kctl;
155 kctl->private_free = snd_jack_kctl_private_free;
159 snd_ctl_free_one(kctl);
164 * snd_jack_add_new_kctl - Create a new snd_jack_kctl and add it to jack
165 * @jack: the jack instance which the kctl will attaching to
166 * @name: the name for the snd_kcontrol object
167 * @mask: a bitmask of enum snd_jack_type values that can be detected
168 * by this snd_jack_kctl object.
170 * Creates a new snd_kcontrol object and adds it to the jack kctl_list.
172 * Return: Zero if successful, or a negative error code on failure.
174 int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
176 struct snd_jack_kctl *jack_kctl;
178 jack_kctl = snd_jack_kctl_new(jack->card, name, mask);
182 snd_jack_kctl_add(jack, jack_kctl);
185 EXPORT_SYMBOL(snd_jack_add_new_kctl);
188 * snd_jack_new - Create a new jack
189 * @card: the card instance
190 * @id: an identifying string for this jack
191 * @type: a bitmask of enum snd_jack_type values that can be detected by
193 * @jjack: Used to provide the allocated jack object to the caller.
194 * @initial_kctl: if true, create a kcontrol and add it to the jack list.
195 * @phantom_jack: Don't create a input device for phantom jacks.
197 * Creates a new jack object.
199 * Return: Zero if successful, or a negative error code on failure.
200 * On success @jjack will be initialised.
202 int snd_jack_new(struct snd_card *card, const char *id, int type,
203 struct snd_jack **jjack, bool initial_kctl, bool phantom_jack)
205 struct snd_jack *jack;
206 struct snd_jack_kctl *jack_kctl = NULL;
209 static struct snd_device_ops ops = {
210 .dev_free = snd_jack_dev_free,
211 .dev_register = snd_jack_dev_register,
212 .dev_disconnect = snd_jack_dev_disconnect,
216 jack_kctl = snd_jack_kctl_new(card, id, type);
221 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
225 jack->id = kstrdup(id, GFP_KERNEL);
227 /* don't creat input device for phantom jack */
229 jack->input_dev = input_allocate_device();
230 if (jack->input_dev == NULL) {
235 jack->input_dev->phys = "ALSA";
239 for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
241 input_set_capability(jack->input_dev, EV_SW,
242 jack_switch_types[i]);
246 err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
251 INIT_LIST_HEAD(&jack->kctl_list);
254 snd_jack_kctl_add(jack, jack_kctl);
261 input_free_device(jack->input_dev);
266 EXPORT_SYMBOL(snd_jack_new);
269 * snd_jack_set_parent - Set the parent device for a jack
271 * @jack: The jack to configure
272 * @parent: The device to set as parent for the jack.
274 * Set the parent for the jack devices in the device tree. This
275 * function is only valid prior to registration of the jack. If no
276 * parent is configured then the parent device will be the sound card.
278 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
280 WARN_ON(jack->registered);
282 jack->input_dev->dev.parent = parent;
284 EXPORT_SYMBOL(snd_jack_set_parent);
287 * snd_jack_set_key - Set a key mapping on a jack
289 * @jack: The jack to configure
290 * @type: Jack report type for this key
291 * @keytype: Input layer key type to be reported
293 * Map a SND_JACK_BTN_ button type to an input layer key, allowing
294 * reporting of keys on accessories via the jack abstraction. If no
295 * mapping is provided but keys are enabled in the jack type then
296 * BTN_n numeric buttons will be reported.
298 * If jacks are not reporting via the input API this call will have no
301 * Note that this is intended to be use by simple devices with small
302 * numbers of keys that can be reported. It is also possible to
303 * access the input device directly - devices with complex input
304 * capabilities on accessories should consider doing this rather than
305 * using this abstraction.
307 * This function may only be called prior to registration of the jack.
309 * Return: Zero if successful, or a negative error code on failure.
311 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
314 int key = fls(SND_JACK_BTN_0) - fls(type);
316 WARN_ON(jack->registered);
318 if (!keytype || key >= ARRAY_SIZE(jack->key))
322 jack->key[key] = keytype;
326 EXPORT_SYMBOL(snd_jack_set_key);
329 * snd_jack_report - Report the current status of a jack
331 * @jack: The jack to report status for
332 * @status: The current status of the jack
334 void snd_jack_report(struct snd_jack *jack, int status)
336 struct snd_jack_kctl *jack_kctl;
342 for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
343 int testbit = SND_JACK_BTN_0 >> i;
345 if (jack->type & testbit)
346 input_report_key(jack->input_dev, jack->key[i],
350 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
351 int testbit = 1 << i;
352 if (jack->type & testbit)
353 input_report_switch(jack->input_dev,
354 jack_switch_types[i],
358 input_sync(jack->input_dev);
360 list_for_each_entry(jack_kctl, &jack->kctl_list, list)
361 snd_kctl_jack_report(jack->card, jack_kctl->kctl,
362 status & jack_kctl->mask_bits);
365 EXPORT_SYMBOL(snd_jack_report);
367 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
368 MODULE_DESCRIPTION("Jack detection support for ALSA");
369 MODULE_LICENSE("GPL");