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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> |
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24 | #include <sound/jack.h> |
25 | #include <sound/core.h> | |
26 | ||
1c6e555c | 27 | static int jack_switch_types[] = { |
bd8a71a7 MB |
28 | SW_HEADPHONE_INSERT, |
29 | SW_MICROPHONE_INSERT, | |
30 | SW_LINEOUT_INSERT, | |
31 | SW_JACK_PHYSICAL_INSERT, | |
d506fc32 | 32 | SW_VIDEOOUT_INSERT, |
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33 | }; |
34 | ||
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35 | static int snd_jack_dev_free(struct snd_device *device) |
36 | { | |
37 | struct snd_jack *jack = device->device_data; | |
38 | ||
9d59065c TI |
39 | if (jack->private_free) |
40 | jack->private_free(jack); | |
41 | ||
e76d8cea MB |
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); | |
48 | ||
282cd76f | 49 | kfree(jack->id); |
e76d8cea MB |
50 | kfree(jack); |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int snd_jack_dev_register(struct snd_device *device) | |
56 | { | |
57 | struct snd_jack *jack = device->device_data; | |
58 | struct snd_card *card = device->card; | |
ebb812cb | 59 | int err, i; |
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60 | |
61 | snprintf(jack->name, sizeof(jack->name), "%s %s", | |
2678f60d | 62 | card->shortname, jack->id); |
e76d8cea MB |
63 | jack->input_dev->name = jack->name; |
64 | ||
65 | /* Default to the sound card device. */ | |
66 | if (!jack->input_dev->dev.parent) | |
1f3fff7b | 67 | jack->input_dev->dev.parent = snd_card_get_device_link(card); |
e76d8cea | 68 | |
ebb812cb MB |
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; | |
72 | ||
73 | if (!(jack->type & testbit)) | |
74 | continue; | |
75 | ||
76 | if (!jack->key[i]) | |
77 | jack->key[i] = BTN_0 + i; | |
78 | ||
79 | input_set_capability(jack->input_dev, EV_KEY, jack->key[i]); | |
80 | } | |
81 | ||
e76d8cea MB |
82 | err = input_register_device(jack->input_dev); |
83 | if (err == 0) | |
84 | jack->registered = 1; | |
85 | ||
86 | return err; | |
87 | } | |
88 | ||
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. | |
96 | * | |
97 | * Creates a new jack object. | |
98 | * | |
99 | * Returns zero if successful, or a negative error code on failure. | |
100 | * On success jjack will be initialised. | |
101 | */ | |
102 | int snd_jack_new(struct snd_card *card, const char *id, int type, | |
103 | struct snd_jack **jjack) | |
104 | { | |
105 | struct snd_jack *jack; | |
106 | int err; | |
bd8a71a7 | 107 | int i; |
e76d8cea MB |
108 | static struct snd_device_ops ops = { |
109 | .dev_free = snd_jack_dev_free, | |
110 | .dev_register = snd_jack_dev_register, | |
111 | }; | |
112 | ||
113 | jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL); | |
114 | if (jack == NULL) | |
115 | return -ENOMEM; | |
116 | ||
282cd76f | 117 | jack->id = kstrdup(id, GFP_KERNEL); |
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118 | |
119 | jack->input_dev = input_allocate_device(); | |
120 | if (jack->input_dev == NULL) { | |
121 | err = -ENOMEM; | |
122 | goto fail_input; | |
123 | } | |
124 | ||
125 | jack->input_dev->phys = "ALSA"; | |
126 | ||
127 | jack->type = type; | |
128 | ||
1c6e555c | 129 | for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) |
bd8a71a7 MB |
130 | if (type & (1 << i)) |
131 | input_set_capability(jack->input_dev, EV_SW, | |
1c6e555c | 132 | jack_switch_types[i]); |
e76d8cea MB |
133 | |
134 | err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops); | |
135 | if (err < 0) | |
136 | goto fail_input; | |
137 | ||
138 | *jjack = jack; | |
139 | ||
140 | return 0; | |
141 | ||
142 | fail_input: | |
143 | input_free_device(jack->input_dev); | |
eeda276b | 144 | kfree(jack->id); |
e76d8cea MB |
145 | kfree(jack); |
146 | return err; | |
147 | } | |
148 | EXPORT_SYMBOL(snd_jack_new); | |
149 | ||
150 | /** | |
151 | * snd_jack_set_parent - Set the parent device for a jack | |
152 | * | |
153 | * @jack: The jack to configure | |
154 | * @parent: The device to set as parent for the jack. | |
155 | * | |
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. | |
159 | */ | |
160 | void snd_jack_set_parent(struct snd_jack *jack, struct device *parent) | |
161 | { | |
162 | WARN_ON(jack->registered); | |
163 | ||
164 | jack->input_dev->dev.parent = parent; | |
165 | } | |
166 | EXPORT_SYMBOL(snd_jack_set_parent); | |
167 | ||
ebb812cb MB |
168 | /** |
169 | * snd_jack_set_key - Set a key mapping on a jack | |
170 | * | |
171 | * @jack: The jack to configure | |
172 | * @type: Jack report type for this key | |
173 | * @keytype: Input layer key type to be reported | |
174 | * | |
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. | |
179 | * | |
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. | |
185 | * | |
186 | * This function may only be called prior to registration of the jack. | |
187 | */ | |
188 | int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type, | |
189 | int keytype) | |
190 | { | |
191 | int key = fls(SND_JACK_BTN_0) - fls(type); | |
192 | ||
193 | WARN_ON(jack->registered); | |
194 | ||
195 | if (!keytype || key >= ARRAY_SIZE(jack->key)) | |
196 | return -EINVAL; | |
197 | ||
198 | jack->type |= type; | |
199 | jack->key[key] = keytype; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | EXPORT_SYMBOL(snd_jack_set_key); | |
204 | ||
e76d8cea MB |
205 | /** |
206 | * snd_jack_report - Report the current status of a jack | |
207 | * | |
208 | * @jack: The jack to report status for | |
209 | * @status: The current status of the jack | |
210 | */ | |
211 | void snd_jack_report(struct snd_jack *jack, int status) | |
212 | { | |
bd8a71a7 MB |
213 | int i; |
214 | ||
9a3f371e MB |
215 | if (!jack) |
216 | return; | |
217 | ||
ebb812cb MB |
218 | for (i = 0; i < ARRAY_SIZE(jack->key); i++) { |
219 | int testbit = SND_JACK_BTN_0 >> i; | |
220 | ||
221 | if (jack->type & testbit) | |
222 | input_report_key(jack->input_dev, jack->key[i], | |
223 | status & testbit); | |
224 | } | |
225 | ||
1c6e555c | 226 | for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) { |
bd8a71a7 MB |
227 | int testbit = 1 << i; |
228 | if (jack->type & testbit) | |
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229 | input_report_switch(jack->input_dev, |
230 | jack_switch_types[i], | |
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231 | status & testbit); |
232 | } | |
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233 | |
234 | input_sync(jack->input_dev); | |
235 | } | |
236 | EXPORT_SYMBOL(snd_jack_report); | |
237 | ||
238 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
239 | MODULE_DESCRIPTION("Jack detection support for ALSA"); | |
240 | MODULE_LICENSE("GPL"); |