/* * Jack abstraction layer * * Copyright 2008 Wolfson Microelectronics * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <linux/input.h> #include <linux/slab.h> #include <linux/module.h> #include <sound/jack.h> #include <sound/core.h> static int jack_switch_types[SND_JACK_SWITCH_TYPES] = { SW_HEADPHONE_INSERT, SW_MICROPHONE_INSERT, SW_LINEOUT_INSERT, SW_JACK_PHYSICAL_INSERT, SW_VIDEOOUT_INSERT, SW_LINEIN_INSERT, }; static int snd_jack_dev_disconnect(struct snd_device *device) { struct snd_jack *jack = device->device_data; if (!jack->input_dev) return 0; /* If the input device is registered with the input subsystem * then we need to use a different deallocator. */ if (jack->registered) input_unregister_device(jack->input_dev); else input_free_device(jack->input_dev); jack->input_dev = NULL; return 0; } static int snd_jack_dev_free(struct snd_device *device) { struct snd_jack *jack = device->device_data; if (jack->private_free) jack->private_free(jack); snd_jack_dev_disconnect(device); kfree(jack->id); kfree(jack); return 0; } static int snd_jack_dev_register(struct snd_device *device) { struct snd_jack *jack = device->device_data; struct snd_card *card = device->card; int err, i; snprintf(jack->name, sizeof(jack->name), "%s %s", card->shortname, jack->id); jack->input_dev->name = jack->name; /* Default to the sound card device. */ if (!jack->input_dev->dev.parent) jack->input_dev->dev.parent = snd_card_get_device_link(card); /* Add capabilities for any keys that are enabled */ for (i = 0; i < ARRAY_SIZE(jack->key); i++) { int testbit = SND_JACK_BTN_0 >> i; if (!(jack->type & testbit)) continue; if (!jack->key[i]) jack->key[i] = BTN_0 + i; input_set_capability(jack->input_dev, EV_KEY, jack->key[i]); } err = input_register_device(jack->input_dev); if (err == 0) jack->registered = 1; return err; } /** * snd_jack_new - Create a new jack * @card: the card instance * @id: an identifying string for this jack * @type: a bitmask of enum snd_jack_type values that can be detected by * this jack * @jjack: Used to provide the allocated jack object to the caller. * * Creates a new jack object. * * Return: Zero if successful, or a negative error code on failure. * On success @jjack will be initialised. */ int snd_jack_new(struct snd_card *card, const char *id, int type, struct snd_jack **jjack) { struct snd_jack *jack; int err; int i; static struct snd_device_ops ops = { .dev_free = snd_jack_dev_free, .dev_register = snd_jack_dev_register, .dev_disconnect = snd_jack_dev_disconnect, }; jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL); if (jack == NULL) return -ENOMEM; jack->id = kstrdup(id, GFP_KERNEL); jack->input_dev = input_allocate_device(); if (jack->input_dev == NULL) { err = -ENOMEM; goto fail_input; } jack->input_dev->phys = "ALSA"; jack->type = type; for (i = 0; i < SND_JACK_SWITCH_TYPES; i++) if (type & (1 << i)) input_set_capability(jack->input_dev, EV_SW, jack_switch_types[i]); err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops); if (err < 0) goto fail_input; *jjack = jack; return 0; fail_input: input_free_device(jack->input_dev); kfree(jack->id); kfree(jack); return err; } EXPORT_SYMBOL(snd_jack_new); /** * snd_jack_set_parent - Set the parent device for a jack * * @jack: The jack to configure * @parent: The device to set as parent for the jack. * * Set the parent for the jack devices in the device tree. This * function is only valid prior to registration of the jack. If no * parent is configured then the parent device will be the sound card. */ void snd_jack_set_parent(struct snd_jack *jack, struct device *parent) { WARN_ON(jack->registered); jack->input_dev->dev.parent = parent; } EXPORT_SYMBOL(snd_jack_set_parent); /** * snd_jack_set_key - Set a key mapping on a jack * * @jack: The jack to configure * @type: Jack report type for this key * @keytype: Input layer key type to be reported * * Map a SND_JACK_BTN_ button type to an input layer key, allowing * reporting of keys on accessories via the jack abstraction. If no * mapping is provided but keys are enabled in the jack type then * BTN_n numeric buttons will be reported. * * If jacks are not reporting via the input API this call will have no * effect. * * Note that this is intended to be use by simple devices with small * numbers of keys that can be reported. It is also possible to * access the input device directly - devices with complex input * capabilities on accessories should consider doing this rather than * using this abstraction. * * This function may only be called prior to registration of the jack. * * Return: Zero if successful, or a negative error code on failure. */ int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type, int keytype) { int key = fls(SND_JACK_BTN_0) - fls(type); WARN_ON(jack->registered); if (!keytype || key >= ARRAY_SIZE(jack->key)) return -EINVAL; jack->type |= type; jack->key[key] = keytype; return 0; } EXPORT_SYMBOL(snd_jack_set_key); /** * snd_jack_report - Report the current status of a jack * * @jack: The jack to report status for * @status: The current status of the jack */ void snd_jack_report(struct snd_jack *jack, int status) { int i; if (!jack) return; for (i = 0; i < ARRAY_SIZE(jack->key); i++) { int testbit = SND_JACK_BTN_0 >> i; if (jack->type & testbit) input_report_key(jack->input_dev, jack->key[i], status & testbit); } for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) { int testbit = 1 << i; if (jack->type & testbit) input_report_switch(jack->input_dev, jack_switch_types[i], status & testbit); } input_sync(jack->input_dev); } EXPORT_SYMBOL(snd_jack_report); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("Jack detection support for ALSA"); MODULE_LICENSE("GPL");