sound/core/jack.c - kernel/lockdown - Git at Google

 /*
  *  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");
	/*
	* 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");