#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_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
  
  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 int
  snd_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 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);
  }
  
  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 */