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@perex.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 #define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data)
  28
  29 struct snd_kcontrol;
  30 typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);
  31 typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
  32 typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
  33 typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
  34                                     int op_flag, /* 0=read,1=write,-1=command */
  35                                     unsigned int size,
  36                                     unsigned int __user *tlv);
  37
  38
  39 struct snd_kcontrol_new {
  40         snd_ctl_elem_iface_t iface;     /* interface identifier */
  41         unsigned int device;            /* device/client number */
  42         unsigned int subdevice;         /* subdevice (substream) number */
  43         unsigned char *name;            /* ASCII name of item */
  44         unsigned int index;             /* index of item */
  45         unsigned int access;            /* access rights */
  46         unsigned int count;             /* count of same elements */
  47         snd_kcontrol_info_t *info;
  48         snd_kcontrol_get_t *get;
  49         snd_kcontrol_put_t *put;
  50         union {
  51                 snd_kcontrol_tlv_rw_t *c;
  52                 const unsigned int *p;
  53         } tlv;
  54         unsigned long private_value;
  55 };
  56
  57 struct snd_kcontrol_volatile {
  58         struct snd_ctl_file *owner;     /* locked */
  59         unsigned int access;    /* access rights */
  60 };
  61
  62 struct snd_kcontrol {
  63         struct list_head list;          /* list of controls */
  64         struct snd_ctl_elem_id id;
  65         unsigned int count;             /* count of same elements */
  66         snd_kcontrol_info_t *info;
  67         snd_kcontrol_get_t *get;
  68         snd_kcontrol_put_t *put;
  69         union {
  70                 snd_kcontrol_tlv_rw_t *c;
  71                 const unsigned int *p;
  72         } tlv;
  73         unsigned long private_value;
  74         void *private_data;
  75         void (*private_free)(struct snd_kcontrol *kcontrol);
  76         struct snd_kcontrol_volatile vd[0];     /* volatile data */
  77 };
  78
  79 #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list)
  80
  81 struct snd_kctl_event {
  82         struct list_head list;  /* list of events */
  83         struct snd_ctl_elem_id id;
  84         unsigned int mask;
  85 };
  86
  87 #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list)
  88
  89 struct snd_ctl_file {
  90         struct list_head list;          /* list of all control files */
  91         struct snd_card *card;
  92         pid_t pid;
  93         int prefer_pcm_subdevice;
  94         int prefer_rawmidi_subdevice;
  95         wait_queue_head_t change_sleep;
  96         spinlock_t read_lock;
  97         struct fasync_struct *fasync;
  98         int subscribed;                 /* read interface is activated */
  99         struct list_head events;        /* waiting events for read */
 100 };
 101
 102 #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list)
 103
 104 typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card,
 105                                       struct snd_ctl_file * control,
 106                                       unsigned int cmd, unsigned long arg);
 107
 108 void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id);
 109
 110 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data);
 111 void snd_ctl_free_one(struct snd_kcontrol * kcontrol);
 112 int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol);
 113 int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);
 114 int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);
 115 int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);
 116 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid);
 117 struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id);
 118
 119 int snd_ctl_create(struct snd_card *card);
 120
 121 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
 122 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
 123 #ifdef CONFIG_COMPAT
 124 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
 125 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
 126 #else
 127 #define snd_ctl_register_ioctl_compat(fcn)
 128 #define snd_ctl_unregister_ioctl_compat(fcn)
 129 #endif
 130
 131 static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
 132 {
 133         return id->numid - kctl->id.numid;
 134 }
 135
 136 static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
 137 {
 138         return id->index - kctl->id.index;
 139 }
 140
 141 static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
 142 {
 143         if (id->numid) {
 144                 return snd_ctl_get_ioffnum(kctl, id);
 145         } else {
 146                 return snd_ctl_get_ioffidx(kctl, id);
 147         }
 148 }
 149
 150 static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id,
 151                                                     struct snd_kcontrol *src_kctl,
 152                                                     unsigned int offset)
 153 {
 154         *dst_id = src_kctl->id;
 155         dst_id->index += offset;
 156         dst_id->numid += offset;
 157         return dst_id;
 158 }
 159
 160 /*
 161  * Frequently used control callbacks
 162  */
 163 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
 164                               struct snd_ctl_elem_info *uinfo);
 165 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
 166                                 struct snd_ctl_elem_info *uinfo);
 167
 168 /*
 169  * virtual master control
 170  */
 171 struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
 172                                                  const unsigned int *tlv);
 173 int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
 174                        unsigned int flags);
 175 /* optional flags for slave */
 176 #define SND_CTL_SLAVE_NEED_UPDATE       (1 << 0)
 177
 178 /**
 179  * snd_ctl_add_slave - Add a virtual slave control
 180  * @master: vmaster element
 181  * @slave: slave element to add
 182  *
 183  * Add a virtual slave control to the given master element created via
 184  * snd_ctl_create_virtual_master() beforehand.
 185  * Returns zero if successful or a negative error code.
 186  *
 187  * All slaves must be the same type (returning the same information
 188  * via info callback).  The fucntion doesn't check it, so it's your
 189  * responsibility.
 190  *
 191  * Also, some additional limitations:
 192  * at most two channels,
 193  * logarithmic volume control (dB level) thus no linear volume,
 194  * master can only attenuate the volume without gain
 195  */
 196 static inline int
 197 snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
 198 {
 199         return _snd_ctl_add_slave(master, slave, 0);
 200 }
 201
 202 /**
 203  * snd_ctl_add_slave_uncached - Add a virtual slave control
 204  * @master: vmaster element
 205  * @slave: slave element to add
 206  *
 207  * Add a virtual slave control to the given master.
 208  * Unlike snd_ctl_add_slave(), the element added via this function
 209  * is supposed to have volatile values, and get callback is called
 210  * at each time quried from the master.
 211  *
 212  * When the control peeks the hardware values directly and the value
 213  * can be changed by other means than the put callback of the element,
 214  * this function should be used to keep the value always up-to-date.
 215  */
 216 static inline int
 217 snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
 218                            struct snd_kcontrol *slave)
 219 {
 220         return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
 221 }
 222
 223 #endif  /* __SOUND_CONTROL_H */