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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>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <sound/jack.h>
26#include <sound/core.h>
27
28static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
29 SW_HEADPHONE_INSERT,
30 SW_MICROPHONE_INSERT,
31 SW_LINEOUT_INSERT,
32 SW_JACK_PHYSICAL_INSERT,
33 SW_VIDEOOUT_INSERT,
34 SW_LINEIN_INSERT,
35};
36
37static int snd_jack_dev_disconnect(struct snd_device *device)
38{
39 struct snd_jack *jack = device->device_data;
40
41 if (!jack->input_dev)
42 return 0;
43
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);
50 jack->input_dev = NULL;
51 return 0;
52}
53
54static 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);
62
63 kfree(jack->id);
64 kfree(jack);
65
66 return 0;
67}
68
69static 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;
73 int err, i;
74
75 snprintf(jack->name, sizeof(jack->name), "%s %s",
76 card->shortname, jack->id);
77 jack->input_dev->name = jack->name;
78
79 /* Default to the sound card device. */
80 if (!jack->input_dev->dev.parent)
81 jack->input_dev->dev.parent = snd_card_get_device_link(card);
82
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
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 *
113 * Return: Zero if successful, or a negative error code on failure.
114 * On success @jjack will be initialised.
115 */
116int 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;
121 int i;
122 static struct snd_device_ops ops = {
123 .dev_free = snd_jack_dev_free,
124 .dev_register = snd_jack_dev_register,
125 .dev_disconnect = snd_jack_dev_disconnect,
126 };
127
128 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
129 if (jack == NULL)
130 return -ENOMEM;
131
132 jack->id = kstrdup(id, GFP_KERNEL);
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
144 for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
145 if (type & (1 << i))
146 input_set_capability(jack->input_dev, EV_SW,
147 jack_switch_types[i]);
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
157fail_input:
158 input_free_device(jack->input_dev);
159 kfree(jack->id);
160 kfree(jack);
161 return err;
162}
163EXPORT_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 *
171 * Set the parent for the jack devices in the device tree. This
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 */
175void 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}
181EXPORT_SYMBOL(snd_jack_set_parent);
182
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 *
195 * If jacks are not reporting via the input API this call will have no
196 * effect.
197 *
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.
205 *
206 * Return: Zero if successful, or a negative error code on failure.
207 */
208int 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}
223EXPORT_SYMBOL(snd_jack_set_key);
224
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 */
231void snd_jack_report(struct snd_jack *jack, int status)
232{
233 int i;
234
235 if (!jack)
236 return;
237
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
246 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
247 int testbit = 1 << i;
248 if (jack->type & testbit)
249 input_report_switch(jack->input_dev,
250 jack_switch_types[i],
251 status & testbit);
252 }
253
254 input_sync(jack->input_dev);
255}
256EXPORT_SYMBOL(snd_jack_report);
257
258MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
259MODULE_DESCRIPTION("Jack detection support for ALSA");
260MODULE_LICENSE("GPL");
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>
23#include <linux/slab.h>
24#include <sound/jack.h>
25#include <sound/core.h>
26
27static 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,
33};
34
35static int snd_jack_dev_free(struct snd_device *device)
36{
37 struct snd_jack *jack = device->device_data;
38
39 if (jack->private_free)
40 jack->private_free(jack);
41
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
49 kfree(jack->id);
50 kfree(jack);
51
52 return 0;
53}
54
55static 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;
59 int err, i;
60
61 snprintf(jack->name, sizeof(jack->name), "%s %s",
62 card->shortname, jack->id);
63 jack->input_dev->name = jack->name;
64
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);
68
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
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 */
102int 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;
107 int i;
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
117 jack->id = kstrdup(id, GFP_KERNEL);
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
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]);
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
142fail_input:
143 input_free_device(jack->input_dev);
144 kfree(jack->id);
145 kfree(jack);
146 return err;
147}
148EXPORT_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 */
160void 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}
166EXPORT_SYMBOL(snd_jack_set_parent);
167
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 */
188int 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}
203EXPORT_SYMBOL(snd_jack_set_key);
204
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 */
211void snd_jack_report(struct snd_jack *jack, int status)
212{
213 int i;
214
215 if (!jack)
216 return;
217
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
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);
232 }
233
234 input_sync(jack->input_dev);
235}
236EXPORT_SYMBOL(snd_jack_report);
237
238MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
239MODULE_DESCRIPTION("Jack detection support for ALSA");
240MODULE_LICENSE("GPL");