jack.c revision ebb812cb8df48e299b3d4ab75cbb0042384ef70d
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 <sound/jack.h> 24#include <sound/core.h> 25 26static int jack_switch_types[] = { 27 SW_HEADPHONE_INSERT, 28 SW_MICROPHONE_INSERT, 29 SW_LINEOUT_INSERT, 30 SW_JACK_PHYSICAL_INSERT, 31 SW_VIDEOOUT_INSERT, 32}; 33 34static int snd_jack_dev_free(struct snd_device *device) 35{ 36 struct snd_jack *jack = device->device_data; 37 38 if (jack->private_free) 39 jack->private_free(jack); 40 41 /* If the input device is registered with the input subsystem 42 * then we need to use a different deallocator. */ 43 if (jack->registered) 44 input_unregister_device(jack->input_dev); 45 else 46 input_free_device(jack->input_dev); 47 48 kfree(jack->id); 49 kfree(jack); 50 51 return 0; 52} 53 54static int snd_jack_dev_register(struct snd_device *device) 55{ 56 struct snd_jack *jack = device->device_data; 57 struct snd_card *card = device->card; 58 int err, i; 59 60 snprintf(jack->name, sizeof(jack->name), "%s %s", 61 card->shortname, jack->id); 62 jack->input_dev->name = jack->name; 63 64 /* Default to the sound card device. */ 65 if (!jack->input_dev->dev.parent) 66 jack->input_dev->dev.parent = snd_card_get_device_link(card); 67 68 /* Add capabilities for any keys that are enabled */ 69 for (i = 0; i < ARRAY_SIZE(jack->key); i++) { 70 int testbit = SND_JACK_BTN_0 >> i; 71 72 if (!(jack->type & testbit)) 73 continue; 74 75 if (!jack->key[i]) 76 jack->key[i] = BTN_0 + i; 77 78 input_set_capability(jack->input_dev, EV_KEY, jack->key[i]); 79 } 80 81 err = input_register_device(jack->input_dev); 82 if (err == 0) 83 jack->registered = 1; 84 85 return err; 86} 87 88/** 89 * snd_jack_new - Create a new jack 90 * @card: the card instance 91 * @id: an identifying string for this jack 92 * @type: a bitmask of enum snd_jack_type values that can be detected by 93 * this jack 94 * @jjack: Used to provide the allocated jack object to the caller. 95 * 96 * Creates a new jack object. 97 * 98 * Returns zero if successful, or a negative error code on failure. 99 * On success jjack will be initialised. 100 */ 101int snd_jack_new(struct snd_card *card, const char *id, int type, 102 struct snd_jack **jjack) 103{ 104 struct snd_jack *jack; 105 int err; 106 int i; 107 static struct snd_device_ops ops = { 108 .dev_free = snd_jack_dev_free, 109 .dev_register = snd_jack_dev_register, 110 }; 111 112 jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL); 113 if (jack == NULL) 114 return -ENOMEM; 115 116 jack->id = kstrdup(id, GFP_KERNEL); 117 118 jack->input_dev = input_allocate_device(); 119 if (jack->input_dev == NULL) { 120 err = -ENOMEM; 121 goto fail_input; 122 } 123 124 jack->input_dev->phys = "ALSA"; 125 126 jack->type = type; 127 128 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) 129 if (type & (1 << i)) 130 input_set_capability(jack->input_dev, EV_SW, 131 jack_switch_types[i]); 132 133 err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops); 134 if (err < 0) 135 goto fail_input; 136 137 *jjack = jack; 138 139 return 0; 140 141fail_input: 142 input_free_device(jack->input_dev); 143 kfree(jack); 144 return err; 145} 146EXPORT_SYMBOL(snd_jack_new); 147 148/** 149 * snd_jack_set_parent - Set the parent device for a jack 150 * 151 * @jack: The jack to configure 152 * @parent: The device to set as parent for the jack. 153 * 154 * Set the parent for the jack input device in the device tree. This 155 * function is only valid prior to registration of the jack. If no 156 * parent is configured then the parent device will be the sound card. 157 */ 158void snd_jack_set_parent(struct snd_jack *jack, struct device *parent) 159{ 160 WARN_ON(jack->registered); 161 162 jack->input_dev->dev.parent = parent; 163} 164EXPORT_SYMBOL(snd_jack_set_parent); 165 166/** 167 * snd_jack_set_key - Set a key mapping on a jack 168 * 169 * @jack: The jack to configure 170 * @type: Jack report type for this key 171 * @keytype: Input layer key type to be reported 172 * 173 * Map a SND_JACK_BTN_ button type to an input layer key, allowing 174 * reporting of keys on accessories via the jack abstraction. If no 175 * mapping is provided but keys are enabled in the jack type then 176 * BTN_n numeric buttons will be reported. 177 * 178 * Note that this is intended to be use by simple devices with small 179 * numbers of keys that can be reported. It is also possible to 180 * access the input device directly - devices with complex input 181 * capabilities on accessories should consider doing this rather than 182 * using this abstraction. 183 * 184 * This function may only be called prior to registration of the jack. 185 */ 186int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type, 187 int keytype) 188{ 189 int key = fls(SND_JACK_BTN_0) - fls(type); 190 191 WARN_ON(jack->registered); 192 193 if (!keytype || key >= ARRAY_SIZE(jack->key)) 194 return -EINVAL; 195 196 jack->type |= type; 197 jack->key[key] = keytype; 198 199 return 0; 200} 201EXPORT_SYMBOL(snd_jack_set_key); 202 203/** 204 * snd_jack_report - Report the current status of a jack 205 * 206 * @jack: The jack to report status for 207 * @status: The current status of the jack 208 */ 209void snd_jack_report(struct snd_jack *jack, int status) 210{ 211 int i; 212 213 if (!jack) 214 return; 215 216 for (i = 0; i < ARRAY_SIZE(jack->key); i++) { 217 int testbit = SND_JACK_BTN_0 >> i; 218 219 if (jack->type & testbit) 220 input_report_key(jack->input_dev, jack->key[i], 221 status & testbit); 222 } 223 224 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) { 225 int testbit = 1 << i; 226 if (jack->type & testbit) 227 input_report_switch(jack->input_dev, 228 jack_switch_types[i], 229 status & testbit); 230 } 231 232 input_sync(jack->input_dev); 233} 234EXPORT_SYMBOL(snd_jack_report); 235 236MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 237MODULE_DESCRIPTION("Jack detection support for ALSA"); 238MODULE_LICENSE("GPL"); 239