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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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
da155d5b | 24 | #include <linux/module.h> |
e76d8cea MB |
25 | #include <sound/jack.h> |
26 | #include <sound/core.h> | |
27 | ||
53803aea | 28 | static int jack_switch_types[SND_JACK_SWITCH_TYPES] = { |
bd8a71a7 MB |
29 | SW_HEADPHONE_INSERT, |
30 | SW_MICROPHONE_INSERT, | |
31 | SW_LINEOUT_INSERT, | |
32 | SW_JACK_PHYSICAL_INSERT, | |
d506fc32 | 33 | SW_VIDEOOUT_INSERT, |
7c2f8e40 | 34 | SW_LINEIN_INSERT, |
bd8a71a7 MB |
35 | }; |
36 | ||
32b85442 | 37 | static int snd_jack_dev_disconnect(struct snd_device *device) |
e76d8cea MB |
38 | { |
39 | struct snd_jack *jack = device->device_data; | |
40 | ||
32b85442 TI |
41 | if (!jack->input_dev) |
42 | return 0; | |
9d59065c | 43 | |
e76d8cea MB |
44 | /* If the input device is registered with the input subsystem |
45 | * then we need to use a different deallocator. */ | |
46 | if (jack->registered) | |
47 | input_unregister_device(jack->input_dev); | |
48 | else | |
49 | input_free_device(jack->input_dev); | |
32b85442 TI |
50 | jack->input_dev = NULL; |
51 | return 0; | |
52 | } | |
53 | ||
54 | static int snd_jack_dev_free(struct snd_device *device) | |
55 | { | |
56 | struct snd_jack *jack = device->device_data; | |
57 | ||
58 | if (jack->private_free) | |
59 | jack->private_free(jack); | |
60 | ||
61 | snd_jack_dev_disconnect(device); | |
e76d8cea | 62 | |
282cd76f | 63 | kfree(jack->id); |
e76d8cea MB |
64 | kfree(jack); |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static int snd_jack_dev_register(struct snd_device *device) | |
70 | { | |
71 | struct snd_jack *jack = device->device_data; | |
72 | struct snd_card *card = device->card; | |
ebb812cb | 73 | int err, i; |
e76d8cea MB |
74 | |
75 | snprintf(jack->name, sizeof(jack->name), "%s %s", | |
2678f60d | 76 | card->shortname, jack->id); |
e76d8cea MB |
77 | jack->input_dev->name = jack->name; |
78 | ||
79 | /* Default to the sound card device. */ | |
80 | if (!jack->input_dev->dev.parent) | |
1f3fff7b | 81 | jack->input_dev->dev.parent = snd_card_get_device_link(card); |
e76d8cea | 82 | |
ebb812cb MB |
83 | /* Add capabilities for any keys that are enabled */ |
84 | for (i = 0; i < ARRAY_SIZE(jack->key); i++) { | |
85 | int testbit = SND_JACK_BTN_0 >> i; | |
86 | ||
87 | if (!(jack->type & testbit)) | |
88 | continue; | |
89 | ||
90 | if (!jack->key[i]) | |
91 | jack->key[i] = BTN_0 + i; | |
92 | ||
93 | input_set_capability(jack->input_dev, EV_KEY, jack->key[i]); | |
94 | } | |
95 | ||
e76d8cea MB |
96 | err = input_register_device(jack->input_dev); |
97 | if (err == 0) | |
98 | jack->registered = 1; | |
99 | ||
100 | return err; | |
101 | } | |
102 | ||
103 | /** | |
104 | * snd_jack_new - Create a new jack | |
105 | * @card: the card instance | |
106 | * @id: an identifying string for this jack | |
107 | * @type: a bitmask of enum snd_jack_type values that can be detected by | |
108 | * this jack | |
109 | * @jjack: Used to provide the allocated jack object to the caller. | |
110 | * | |
111 | * Creates a new jack object. | |
112 | * | |
eb7c06e8 YB |
113 | * Return: Zero if successful, or a negative error code on failure. |
114 | * On success @jjack will be initialised. | |
e76d8cea MB |
115 | */ |
116 | int snd_jack_new(struct snd_card *card, const char *id, int type, | |
117 | struct snd_jack **jjack) | |
118 | { | |
119 | struct snd_jack *jack; | |
120 | int err; | |
bd8a71a7 | 121 | int i; |
e76d8cea MB |
122 | static struct snd_device_ops ops = { |
123 | .dev_free = snd_jack_dev_free, | |
124 | .dev_register = snd_jack_dev_register, | |
32b85442 | 125 | .dev_disconnect = snd_jack_dev_disconnect, |
e76d8cea MB |
126 | }; |
127 | ||
128 | jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL); | |
129 | if (jack == NULL) | |
130 | return -ENOMEM; | |
131 | ||
282cd76f | 132 | jack->id = kstrdup(id, GFP_KERNEL); |
e76d8cea MB |
133 | |
134 | jack->input_dev = input_allocate_device(); | |
135 | if (jack->input_dev == NULL) { | |
136 | err = -ENOMEM; | |
137 | goto fail_input; | |
138 | } | |
139 | ||
140 | jack->input_dev->phys = "ALSA"; | |
141 | ||
142 | jack->type = type; | |
143 | ||
53803aea | 144 | for (i = 0; i < SND_JACK_SWITCH_TYPES; i++) |
bd8a71a7 MB |
145 | if (type & (1 << i)) |
146 | input_set_capability(jack->input_dev, EV_SW, | |
1c6e555c | 147 | jack_switch_types[i]); |
e76d8cea MB |
148 | |
149 | err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops); | |
150 | if (err < 0) | |
151 | goto fail_input; | |
152 | ||
153 | *jjack = jack; | |
154 | ||
155 | return 0; | |
156 | ||
157 | fail_input: | |
158 | input_free_device(jack->input_dev); | |
eeda276b | 159 | kfree(jack->id); |
e76d8cea MB |
160 | kfree(jack); |
161 | return err; | |
162 | } | |
163 | EXPORT_SYMBOL(snd_jack_new); | |
164 | ||
165 | /** | |
166 | * snd_jack_set_parent - Set the parent device for a jack | |
167 | * | |
168 | * @jack: The jack to configure | |
169 | * @parent: The device to set as parent for the jack. | |
170 | * | |
a2e888f0 | 171 | * Set the parent for the jack devices in the device tree. This |
e76d8cea MB |
172 | * function is only valid prior to registration of the jack. If no |
173 | * parent is configured then the parent device will be the sound card. | |
174 | */ | |
175 | void snd_jack_set_parent(struct snd_jack *jack, struct device *parent) | |
176 | { | |
177 | WARN_ON(jack->registered); | |
178 | ||
179 | jack->input_dev->dev.parent = parent; | |
180 | } | |
181 | EXPORT_SYMBOL(snd_jack_set_parent); | |
182 | ||
ebb812cb MB |
183 | /** |
184 | * snd_jack_set_key - Set a key mapping on a jack | |
185 | * | |
186 | * @jack: The jack to configure | |
187 | * @type: Jack report type for this key | |
188 | * @keytype: Input layer key type to be reported | |
189 | * | |
190 | * Map a SND_JACK_BTN_ button type to an input layer key, allowing | |
191 | * reporting of keys on accessories via the jack abstraction. If no | |
192 | * mapping is provided but keys are enabled in the jack type then | |
193 | * BTN_n numeric buttons will be reported. | |
194 | * | |
a2e888f0 MB |
195 | * If jacks are not reporting via the input API this call will have no |
196 | * effect. | |
197 | * | |
ebb812cb MB |
198 | * Note that this is intended to be use by simple devices with small |
199 | * numbers of keys that can be reported. It is also possible to | |
200 | * access the input device directly - devices with complex input | |
201 | * capabilities on accessories should consider doing this rather than | |
202 | * using this abstraction. | |
203 | * | |
204 | * This function may only be called prior to registration of the jack. | |
eb7c06e8 YB |
205 | * |
206 | * Return: Zero if successful, or a negative error code on failure. | |
ebb812cb MB |
207 | */ |
208 | int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type, | |
209 | int keytype) | |
210 | { | |
211 | int key = fls(SND_JACK_BTN_0) - fls(type); | |
212 | ||
213 | WARN_ON(jack->registered); | |
214 | ||
215 | if (!keytype || key >= ARRAY_SIZE(jack->key)) | |
216 | return -EINVAL; | |
217 | ||
218 | jack->type |= type; | |
219 | jack->key[key] = keytype; | |
220 | ||
221 | return 0; | |
222 | } | |
223 | EXPORT_SYMBOL(snd_jack_set_key); | |
224 | ||
e76d8cea MB |
225 | /** |
226 | * snd_jack_report - Report the current status of a jack | |
227 | * | |
228 | * @jack: The jack to report status for | |
229 | * @status: The current status of the jack | |
230 | */ | |
231 | void snd_jack_report(struct snd_jack *jack, int status) | |
232 | { | |
bd8a71a7 MB |
233 | int i; |
234 | ||
9a3f371e MB |
235 | if (!jack) |
236 | return; | |
237 | ||
ebb812cb MB |
238 | for (i = 0; i < ARRAY_SIZE(jack->key); i++) { |
239 | int testbit = SND_JACK_BTN_0 >> i; | |
240 | ||
241 | if (jack->type & testbit) | |
242 | input_report_key(jack->input_dev, jack->key[i], | |
243 | status & testbit); | |
244 | } | |
245 | ||
1c6e555c | 246 | for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) { |
bd8a71a7 MB |
247 | int testbit = 1 << i; |
248 | if (jack->type & testbit) | |
1c6e555c MB |
249 | input_report_switch(jack->input_dev, |
250 | jack_switch_types[i], | |
bd8a71a7 MB |
251 | status & testbit); |
252 | } | |
e76d8cea MB |
253 | |
254 | input_sync(jack->input_dev); | |
255 | } | |
256 | EXPORT_SYMBOL(snd_jack_report); | |
257 | ||
258 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
259 | MODULE_DESCRIPTION("Jack detection support for ALSA"); | |
260 | MODULE_LICENSE("GPL"); |