a2e888f0d7
Since this is a generic API which should support any userspace interface for reporting jacks update the documentation a little to make that a bit clearer. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
246 lines
6.2 KiB
C
246 lines
6.2 KiB
C
/*
|
|
* 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_free(struct snd_device *device)
|
|
{
|
|
struct snd_jack *jack = device->device_data;
|
|
|
|
if (jack->private_free)
|
|
jack->private_free(jack);
|
|
|
|
/* 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);
|
|
|
|
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.
|
|
*
|
|
* Returns 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,
|
|
};
|
|
|
|
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.
|
|
*/
|
|
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");
|