Release 4.7 include/sound/control.h

#ifndef __SOUND_CONTROL_H

#define __SOUND_CONTROL_H

/*
 *  Header file for control interface
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   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 <sound/asound.h>


#define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data)

struct snd_kcontrol;

typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);

typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);

typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);

typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
				    int op_flag, /* SNDRV_CTL_TLV_OP_XXX */
				    unsigned int size,
				    unsigned int __user *tlv);

enum {
	
SNDRV_CTL_TLV_OP_READ = 0,
	
SNDRV_CTL_TLV_OP_WRITE = 1,
	
SNDRV_CTL_TLV_OP_CMD = -1,
};


struct snd_kcontrol_new {
	
snd_ctl_elem_iface_t iface;	/* interface identifier */
	
unsigned int device;		/* device/client number */
	
unsigned int subdevice;		/* subdevice (substream) number */
	
const unsigned char *name;	/* ASCII name of item */
	
unsigned int index;		/* index of item */
	
unsigned int access;		/* access rights */
	
unsigned int count;		/* count of same elements */
	
snd_kcontrol_info_t *info;
	
snd_kcontrol_get_t *get;
	
snd_kcontrol_put_t *put;
	union {
		
snd_kcontrol_tlv_rw_t *c;
		
const unsigned int *p;
	} 
tlv;
	
unsigned long private_value;
};


struct snd_kcontrol_volatile {
	
struct snd_ctl_file *owner;	/* locked */
	
unsigned int access;	/* access rights */
};


struct snd_kcontrol {
	
struct list_head list;		/* list of controls */
	
struct snd_ctl_elem_id id;
	
unsigned int count;		/* count of same elements */
	
snd_kcontrol_info_t *info;
	
snd_kcontrol_get_t *get;
	
snd_kcontrol_put_t *put;
	union {
		
snd_kcontrol_tlv_rw_t *c;
		
const unsigned int *p;
	} 
tlv;
	
unsigned long private_value;
	
void *private_data;
	
void (*private_free)(struct snd_kcontrol *kcontrol);
	
struct snd_kcontrol_volatile vd[0];	/* volatile data */
};


#define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list)


struct snd_kctl_event {
	
struct list_head list;	/* list of events */
	
struct snd_ctl_elem_id id;
	
unsigned int mask;
};


#define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list)

struct pid;

enum {
	
SND_CTL_SUBDEV_PCM,
	
SND_CTL_SUBDEV_RAWMIDI,
	
SND_CTL_SUBDEV_ITEMS,
};


struct snd_ctl_file {
	
struct list_head list;		/* list of all control files */
	
struct snd_card *card;
	
struct pid *pid;
	
int preferred_subdevice[SND_CTL_SUBDEV_ITEMS];
	
wait_queue_head_t change_sleep;
	
spinlock_t read_lock;
	
struct fasync_struct *fasync;
	
int subscribed;			/* read interface is activated */
	
struct list_head events;	/* waiting events for read */
};


#define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list)


typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card,
				      struct snd_ctl_file * control,
				      unsigned int cmd, unsigned long arg);

void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id);

struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data);
void snd_ctl_free_one(struct snd_kcontrol * kcontrol);
int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol);
int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);
int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, bool add_on_replace);
int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);
int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);
int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
			int active);
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid);
struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id);

int snd_ctl_create(struct snd_card *card);

int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
#ifdef CONFIG_COMPAT
int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
#else

#define snd_ctl_register_ioctl_compat(fcn)

#define snd_ctl_unregister_ioctl_compat(fcn)
#endif

int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type);



static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
{
	return id->numid - kctl->id.numid;
}

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static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
{
	return id->index - kctl->id.index;
}

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static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
{
	if (id->numid) {
		return snd_ctl_get_ioffnum(kctl, id);
	} else {
		return snd_ctl_get_ioffidx(kctl, id);
	}
}

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static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id,
						    struct snd_kcontrol *src_kctl,
						    unsigned int offset)
{
	*dst_id = src_kctl->id;
	dst_id->index += offset;
	dst_id->numid += offset;
	return dst_id;
}

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/*
 * Frequently used control callbacks/helpers
 */
int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_info *uinfo);
int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
				struct snd_ctl_elem_info *uinfo);
int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
		      unsigned int items, const char *const names[]);

/*
 * virtual master control
 */
struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
						 const unsigned int *tlv);
int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
		       unsigned int flags);
/* optional flags for slave */

#define SND_CTL_SLAVE_NEED_UPDATE	(1 << 0)

/**
 * snd_ctl_add_slave - Add a virtual slave control
 * @master: vmaster element
 * @slave: slave element to add
 *
 * Add a virtual slave control to the given master element created via
 * snd_ctl_create_virtual_master() beforehand.
 *
 * All slaves must be the same type (returning the same information
 * via info callback).  The function doesn't check it, so it's your
 * responsibility.
 *
 * Also, some additional limitations:
 * at most two channels,
 * logarithmic volume control (dB level) thus no linear volume,
 * master can only attenuate the volume without gain
 *
 * Return: Zero if successful or a negative error code.
 */

static inline int

snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
{
	return _snd_ctl_add_slave(master, slave, 0);
}

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/**
 * snd_ctl_add_slave_uncached - Add a virtual slave control
 * @master: vmaster element
 * @slave: slave element to add
 *
 * Add a virtual slave control to the given master.
 * Unlike snd_ctl_add_slave(), the element added via this function
 * is supposed to have volatile values, and get callback is called
 * at each time queried from the master.
 *
 * When the control peeks the hardware values directly and the value
 * can be changed by other means than the put callback of the element,
 * this function should be used to keep the value always up-to-date.
 *
 * Return: Zero if successful or a negative error code.
 */

static inline int

snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
			   struct snd_kcontrol *slave)
{
	return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
}

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int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kctl,
			     void (*hook)(void *private_data, int),
			     void *private_data);
void snd_ctl_sync_vmaster(struct snd_kcontrol *kctl, bool hook_only);

#define snd_ctl_sync_vmaster_hook(kctl)	snd_ctl_sync_vmaster(kctl, true)

/*
 * Helper functions for jack-detection controls
 */
struct snd_kcontrol *
snd_kctl_jack_new(const char *name, struct snd_card *card);
void snd_kctl_jack_report(struct snd_card *card,
			  struct snd_kcontrol *kctl, bool status);

#endif	/* __SOUND_CONTROL_H */
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Directory: include/sound

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