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 #ifdef CONFIG_SND_JACK_INPUT_DEV
36 static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
40 SW_JACK_PHYSICAL_INSERT,
44 #endif /* CONFIG_SND_JACK_INPUT_DEV */
46 static int snd_jack_dev_disconnect(struct snd_device *device)
48 #ifdef CONFIG_SND_JACK_INPUT_DEV
49 struct snd_jack *jack = device->device_data;
54 /* If the input device is registered with the input subsystem
55 * then we need to use a different deallocator. */
57 input_unregister_device(jack->input_dev);
59 input_free_device(jack->input_dev);
60 jack->input_dev = NULL;
61 #endif /* CONFIG_SND_JACK_INPUT_DEV */
65 static int snd_jack_dev_free(struct snd_device *device)
67 struct snd_jack *jack = device->device_data;
68 struct snd_card *card = device->card;
69 struct snd_jack_kctl *jack_kctl, *tmp_jack_kctl;
71 list_for_each_entry_safe(jack_kctl, tmp_jack_kctl, &jack->kctl_list, list) {
72 list_del_init(&jack_kctl->list);
73 snd_ctl_remove(card, jack_kctl->kctl);
75 if (jack->private_free)
76 jack->private_free(jack);
78 snd_jack_dev_disconnect(device);
86 #ifdef CONFIG_SND_JACK_INPUT_DEV
87 static int snd_jack_dev_register(struct snd_device *device)
89 struct snd_jack *jack = device->device_data;
90 struct snd_card *card = device->card;
93 snprintf(jack->name, sizeof(jack->name), "%s %s",
94 card->shortname, jack->id);
99 jack->input_dev->name = jack->name;
101 /* Default to the sound card device. */
102 if (!jack->input_dev->dev.parent)
103 jack->input_dev->dev.parent = snd_card_get_device_link(card);
105 /* Add capabilities for any keys that are enabled */
106 for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
107 int testbit = SND_JACK_BTN_0 >> i;
109 if (!(jack->type & testbit))
113 jack->key[i] = BTN_0 + i;
115 input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
118 err = input_register_device(jack->input_dev);
120 jack->registered = 1;
124 #endif /* CONFIG_SND_JACK_INPUT_DEV */
126 static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
128 struct snd_jack_kctl *jack_kctl;
130 jack_kctl = kctl->private_data;
132 list_del(&jack_kctl->list);
137 static void snd_jack_kctl_add(struct snd_jack *jack, struct snd_jack_kctl *jack_kctl)
139 list_add_tail(&jack_kctl->list, &jack->kctl_list);
142 static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const char *name, unsigned int mask)
144 struct snd_kcontrol *kctl;
145 struct snd_jack_kctl *jack_kctl;
148 kctl = snd_kctl_jack_new(name, card);
152 err = snd_ctl_add(card, kctl);
156 jack_kctl = kzalloc(sizeof(*jack_kctl), GFP_KERNEL);
161 jack_kctl->kctl = kctl;
162 jack_kctl->mask_bits = mask;
164 kctl->private_data = jack_kctl;
165 kctl->private_free = snd_jack_kctl_private_free;
169 snd_ctl_free_one(kctl);
174 * snd_jack_add_new_kctl - Create a new snd_jack_kctl and add it to jack
175 * @jack: the jack instance which the kctl will attaching to
176 * @name: the name for the snd_kcontrol object
177 * @mask: a bitmask of enum snd_jack_type values that can be detected
178 * by this snd_jack_kctl object.
180 * Creates a new snd_kcontrol object and adds it to the jack kctl_list.
182 * Return: Zero if successful, or a negative error code on failure.
184 int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
186 struct snd_jack_kctl *jack_kctl;
188 jack_kctl = snd_jack_kctl_new(jack->card, name, mask);
192 snd_jack_kctl_add(jack, jack_kctl);
195 EXPORT_SYMBOL(snd_jack_add_new_kctl);
198 * snd_jack_new - Create a new jack
199 * @card: the card instance
200 * @id: an identifying string for this jack
201 * @type: a bitmask of enum snd_jack_type values that can be detected by
203 * @jjack: Used to provide the allocated jack object to the caller.
204 * @initial_kctl: if true, create a kcontrol and add it to the jack list.
205 * @phantom_jack: Don't create a input device for phantom jacks.
207 * Creates a new jack object.
209 * Return: Zero if successful, or a negative error code on failure.
210 * On success @jjack will be initialised.
212 int snd_jack_new(struct snd_card *card, const char *id, int type,
213 struct snd_jack **jjack, bool initial_kctl, bool phantom_jack)
215 struct snd_jack *jack;
216 struct snd_jack_kctl *jack_kctl = NULL;
218 static struct snd_device_ops ops = {
219 .dev_free = snd_jack_dev_free,
220 #ifdef CONFIG_SND_JACK_INPUT_DEV
221 .dev_register = snd_jack_dev_register,
222 .dev_disconnect = snd_jack_dev_disconnect,
223 #endif /* CONFIG_SND_JACK_INPUT_DEV */
227 jack_kctl = snd_jack_kctl_new(card, id, type);
232 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
236 jack->id = kstrdup(id, GFP_KERNEL);
238 /* don't creat input device for phantom jack */
240 #ifdef CONFIG_SND_JACK_INPUT_DEV
243 jack->input_dev = input_allocate_device();
244 if (jack->input_dev == NULL) {
249 jack->input_dev->phys = "ALSA";
253 for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
255 input_set_capability(jack->input_dev, EV_SW,
256 jack_switch_types[i]);
258 #endif /* CONFIG_SND_JACK_INPUT_DEV */
261 err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
266 INIT_LIST_HEAD(&jack->kctl_list);
269 snd_jack_kctl_add(jack, jack_kctl);
276 #ifdef CONFIG_SND_JACK_INPUT_DEV
277 input_free_device(jack->input_dev);
283 EXPORT_SYMBOL(snd_jack_new);
285 #ifdef CONFIG_SND_JACK_INPUT_DEV
287 * snd_jack_set_parent - Set the parent device for a jack
289 * @jack: The jack to configure
290 * @parent: The device to set as parent for the jack.
292 * Set the parent for the jack devices in the device tree. This
293 * function is only valid prior to registration of the jack. If no
294 * parent is configured then the parent device will be the sound card.
296 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
298 WARN_ON(jack->registered);
299 if (!jack->input_dev)
302 jack->input_dev->dev.parent = parent;
304 EXPORT_SYMBOL(snd_jack_set_parent);
307 * snd_jack_set_key - Set a key mapping on a jack
309 * @jack: The jack to configure
310 * @type: Jack report type for this key
311 * @keytype: Input layer key type to be reported
313 * Map a SND_JACK_BTN_ button type to an input layer key, allowing
314 * reporting of keys on accessories via the jack abstraction. If no
315 * mapping is provided but keys are enabled in the jack type then
316 * BTN_n numeric buttons will be reported.
318 * If jacks are not reporting via the input API this call will have no
321 * Note that this is intended to be use by simple devices with small
322 * numbers of keys that can be reported. It is also possible to
323 * access the input device directly - devices with complex input
324 * capabilities on accessories should consider doing this rather than
325 * using this abstraction.
327 * This function may only be called prior to registration of the jack.
329 * Return: Zero if successful, or a negative error code on failure.
331 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
334 int key = fls(SND_JACK_BTN_0) - fls(type);
336 WARN_ON(jack->registered);
338 if (!keytype || key >= ARRAY_SIZE(jack->key))
342 jack->key[key] = keytype;
345 EXPORT_SYMBOL(snd_jack_set_key);
346 #endif /* CONFIG_SND_JACK_INPUT_DEV */
349 * snd_jack_report - Report the current status of a jack
351 * @jack: The jack to report status for
352 * @status: The current status of the jack
354 void snd_jack_report(struct snd_jack *jack, int status)
356 struct snd_jack_kctl *jack_kctl;
357 #ifdef CONFIG_SND_JACK_INPUT_DEV
364 list_for_each_entry(jack_kctl, &jack->kctl_list, list)
365 snd_kctl_jack_report(jack->card, jack_kctl->kctl,
366 status & jack_kctl->mask_bits);
368 #ifdef CONFIG_SND_JACK_INPUT_DEV
369 if (!jack->input_dev)
372 for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
373 int testbit = SND_JACK_BTN_0 >> i;
375 if (jack->type & testbit)
376 input_report_key(jack->input_dev, jack->key[i],
380 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
381 int testbit = 1 << i;
382 if (jack->type & testbit)
383 input_report_switch(jack->input_dev,
384 jack_switch_types[i],
388 input_sync(jack->input_dev);
389 #endif /* CONFIG_SND_JACK_INPUT_DEV */
391 EXPORT_SYMBOL(snd_jack_report);