#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, /* 0=read,1=write,-1=command */				    unsigned int size,				    unsigned int __user *tlv);  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; struct snd_ctl_file {	struct list_head list;		/* list of all control files */	struct snd_card *card;	struct pid *pid;	int prefer_pcm_subdevice;	int prefer_rawmidi_subdevice;	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_COMPATint 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 static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id){	return id->numid - kctl->id.numid;} static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id){	return id->index - kctl->id.index;} 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);	}} 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;} /* * 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 intsnd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave){	return _snd_ctl_add_slave(master, slave, 0);} /** * 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 quried 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 intsnd_ctl_add_slave_uncached(struct snd_kcontrol *master,			   struct snd_kcontrol *slave){	return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);} 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, int idx, void *private_data);void snd_kctl_jack_report(struct snd_card *card,			  struct snd_kcontrol *kctl, bool status); #endif	/* __SOUND_CONTROL_H */