include/sound/control.h

   1 #ifndef __SOUND_CONTROL_H
   2 #define __SOUND_CONTROL_H
   3
   4 /*
   5  *  Header file for control interface
   6  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   7  *
   8  *
   9  *   This program is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU General Public License as published by
  11  *   the Free Software Foundation; either version 2 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This program is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with this program; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  *
  23  */
  24
  25 #include <sound/asound.h>
  26
  27 typedef struct sndrv_aes_iec958 snd_aes_iec958_t;
  28 typedef struct sndrv_ctl_card_info snd_ctl_card_info_t;
  29 typedef enum sndrv_ctl_elem_type snd_ctl_elem_type_t;
  30 typedef enum sndrv_ctl_elem_iface snd_ctl_elem_iface_t;
  31 typedef struct sndrv_ctl_elem_id snd_ctl_elem_id_t;
  32 typedef struct sndrv_ctl_elem_list snd_ctl_elem_list_t;
  33 typedef struct sndrv_ctl_elem_info snd_ctl_elem_info_t;
  34 typedef struct sndrv_ctl_elem_value snd_ctl_elem_value_t;
  35 typedef enum sndrv_ctl_event_type snd_ctl_event_type_t;
  36 typedef struct sndrv_ctl_event snd_ctl_event_t;
  37
  38 #define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data)
  39
  40 typedef int (snd_kcontrol_info_t) (snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo);
  41 typedef int (snd_kcontrol_get_t) (snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol);
  42 typedef int (snd_kcontrol_put_t) (snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol);
  43
  44 typedef struct _snd_kcontrol_new {
  45         snd_ctl_elem_iface_t iface;     /* interface identifier */
  46         unsigned int device;            /* device/client number */
  47         unsigned int subdevice;         /* subdevice (substream) number */
  48         unsigned char *name;            /* ASCII name of item */
  49         unsigned int index;             /* index of item */
  50         unsigned int access;            /* access rights */
  51         unsigned int count;             /* count of same elements */
  52         snd_kcontrol_info_t *info;
  53         snd_kcontrol_get_t *get;
  54         snd_kcontrol_put_t *put;
  55         unsigned long private_value;
  56 } snd_kcontrol_new_t;
  57
  58 typedef struct _snd_kcontrol_volatile {
  59         snd_ctl_file_t *owner;  /* locked */
  60         pid_t owner_pid;
  61         unsigned int access;    /* access rights */
  62 } snd_kcontrol_volatile_t;
  63
  64 struct _snd_kcontrol {
  65         struct list_head list;          /* list of controls */
  66         snd_ctl_elem_id_t id;
  67         unsigned int count;             /* count of same elements */
  68         snd_kcontrol_info_t *info;
  69         snd_kcontrol_get_t *get;
  70         snd_kcontrol_put_t *put;
  71         unsigned long private_value;
  72         void *private_data;
  73         void (*private_free)(snd_kcontrol_t *kcontrol);
  74         snd_kcontrol_volatile_t vd[0];  /* volatile data */
  75 };
  76
  77 #define snd_kcontrol(n) list_entry(n, snd_kcontrol_t, list)
  78
  79 typedef struct _snd_kctl_event {
  80         struct list_head list;  /* list of events */
  81         snd_ctl_elem_id_t id;
  82         unsigned int mask;
  83 } snd_kctl_event_t;
  84
  85 #define snd_kctl_event(n) list_entry(n, snd_kctl_event_t, list)
  86
  87 struct _snd_ctl_file {
  88         struct list_head list;          /* list of all control files */
  89         snd_card_t *card;
  90         pid_t pid;
  91         int prefer_pcm_subdevice;
  92         int prefer_rawmidi_subdevice;
  93         wait_queue_head_t change_sleep;
  94         spinlock_t read_lock;
  95         struct fasync_struct *fasync;
  96         int subscribed;                 /* read interface is activated */
  97         struct list_head events;        /* waiting events for read */
  98 };
  99
 100 #define snd_ctl_file(n) list_entry(n, snd_ctl_file_t, list)
 101
 102 typedef int (*snd_kctl_ioctl_func_t) (snd_card_t * card,
 103                                  snd_ctl_file_t * control,
 104                                  unsigned int cmd, unsigned long arg);
 105
 106 void snd_ctl_notify(snd_card_t * card, unsigned int mask, snd_ctl_elem_id_t * id);
 107
 108 snd_kcontrol_t *snd_ctl_new(snd_kcontrol_t * kcontrol, unsigned int access);
 109 snd_kcontrol_t *snd_ctl_new1(snd_kcontrol_new_t * kcontrolnew, void * private_data);
 110 void snd_ctl_free_one(snd_kcontrol_t * kcontrol);
 111 int snd_ctl_add(snd_card_t * card, snd_kcontrol_t * kcontrol);
 112 int snd_ctl_remove(snd_card_t * card, snd_kcontrol_t * kcontrol);
 113 int snd_ctl_remove_id(snd_card_t * card, snd_ctl_elem_id_t *id);
 114 int snd_ctl_rename_id(snd_card_t * card, snd_ctl_elem_id_t *src_id, snd_ctl_elem_id_t *dst_id);
 115 snd_kcontrol_t *snd_ctl_find_numid(snd_card_t * card, unsigned int numid);
 116 snd_kcontrol_t *snd_ctl_find_id(snd_card_t * card, snd_ctl_elem_id_t *id);
 117
 118 int snd_ctl_create(snd_card_t *card);
 119
 120 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
 121 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
 122 #ifdef CONFIG_COMPAT
 123 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
 124 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
 125 #else
 126 #define snd_ctl_register_ioctl_compat(fcn)
 127 #define snd_ctl_unregister_ioctl_compat(fcn)
 128 #endif
 129
 130 int snd_ctl_elem_read(snd_card_t *card, snd_ctl_elem_value_t *control);
 131 int snd_ctl_elem_write(snd_card_t *card, snd_ctl_file_t *file, snd_ctl_elem_value_t *control);
 132
 133 static inline unsigned int snd_ctl_get_ioffnum(snd_kcontrol_t *kctl, snd_ctl_elem_id_t *id)
 134 {
 135         return id->numid - kctl->id.numid;
 136 }
 137
 138 static inline unsigned int snd_ctl_get_ioffidx(snd_kcontrol_t *kctl, snd_ctl_elem_id_t *id)
 139 {
 140         return id->index - kctl->id.index;
 141 }
 142
 143 static inline unsigned int snd_ctl_get_ioff(snd_kcontrol_t *kctl, snd_ctl_elem_id_t *id)
 144 {
 145         if (id->numid) {
 146                 return snd_ctl_get_ioffnum(kctl, id);
 147         } else {
 148                 return snd_ctl_get_ioffidx(kctl, id);
 149         }
 150 }
 151
 152 static inline snd_ctl_elem_id_t *snd_ctl_build_ioff(snd_ctl_elem_id_t *dst_id,
 153                                                     snd_kcontrol_t *src_kctl,
 154                                                     unsigned int offset)
 155 {
 156         *dst_id = src_kctl->id;
 157         dst_id->index += offset;
 158         dst_id->numid += offset;
 159         return dst_id;
 160 }
 161
 162 #endif  /* __SOUND_CONTROL_H */