224 lines
7.4 KiB
C
224 lines
7.4 KiB
C
#ifndef __SOUND_CONTROL_H
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#define __SOUND_CONTROL_H
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/*
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* Header file for control interface
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/asound.h>
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#define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data)
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struct snd_kcontrol;
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typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);
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typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
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typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
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typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
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int op_flag, /* 0=read,1=write,-1=command */
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unsigned int size,
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unsigned int __user *tlv);
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struct snd_kcontrol_new {
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snd_ctl_elem_iface_t iface; /* interface identifier */
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unsigned int device; /* device/client number */
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unsigned int subdevice; /* subdevice (substream) number */
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unsigned char *name; /* ASCII name of item */
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unsigned int index; /* index of item */
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unsigned int access; /* access rights */
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unsigned int count; /* count of same elements */
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snd_kcontrol_info_t *info;
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snd_kcontrol_get_t *get;
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snd_kcontrol_put_t *put;
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union {
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snd_kcontrol_tlv_rw_t *c;
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const unsigned int *p;
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} tlv;
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unsigned long private_value;
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};
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struct snd_kcontrol_volatile {
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struct snd_ctl_file *owner; /* locked */
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pid_t owner_pid;
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unsigned int access; /* access rights */
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};
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struct snd_kcontrol {
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struct list_head list; /* list of controls */
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struct snd_ctl_elem_id id;
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unsigned int count; /* count of same elements */
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snd_kcontrol_info_t *info;
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snd_kcontrol_get_t *get;
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snd_kcontrol_put_t *put;
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union {
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snd_kcontrol_tlv_rw_t *c;
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const unsigned int *p;
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} tlv;
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unsigned long private_value;
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void *private_data;
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void (*private_free)(struct snd_kcontrol *kcontrol);
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struct snd_kcontrol_volatile vd[0]; /* volatile data */
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};
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#define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list)
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struct snd_kctl_event {
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struct list_head list; /* list of events */
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struct snd_ctl_elem_id id;
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unsigned int mask;
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};
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#define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list)
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struct snd_ctl_file {
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struct list_head list; /* list of all control files */
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struct snd_card *card;
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pid_t pid;
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int prefer_pcm_subdevice;
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int prefer_rawmidi_subdevice;
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wait_queue_head_t change_sleep;
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spinlock_t read_lock;
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struct fasync_struct *fasync;
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int subscribed; /* read interface is activated */
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struct list_head events; /* waiting events for read */
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};
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#define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list)
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typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card,
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struct snd_ctl_file * control,
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unsigned int cmd, unsigned long arg);
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void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id);
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struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data);
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void snd_ctl_free_one(struct snd_kcontrol * kcontrol);
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int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol);
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int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);
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int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);
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int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);
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struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid);
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struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id);
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int snd_ctl_create(struct snd_card *card);
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int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
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int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
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#ifdef CONFIG_COMPAT
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int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
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int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
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#else
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#define snd_ctl_register_ioctl_compat(fcn)
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#define snd_ctl_unregister_ioctl_compat(fcn)
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#endif
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static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
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{
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return id->numid - kctl->id.numid;
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}
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static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
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{
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return id->index - kctl->id.index;
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}
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static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
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{
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if (id->numid) {
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return snd_ctl_get_ioffnum(kctl, id);
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} else {
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return snd_ctl_get_ioffidx(kctl, id);
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}
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}
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static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id,
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struct snd_kcontrol *src_kctl,
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unsigned int offset)
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{
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*dst_id = src_kctl->id;
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dst_id->index += offset;
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dst_id->numid += offset;
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return dst_id;
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}
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/*
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* Frequently used control callbacks
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*/
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int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo);
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int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo);
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/*
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* virtual master control
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*/
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struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
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const unsigned int *tlv);
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int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
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unsigned int flags);
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/* optional flags for slave */
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#define SND_CTL_SLAVE_NEED_UPDATE (1 << 0)
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/**
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* snd_ctl_add_slave - Add a virtual slave control
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* @master: vmaster element
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* @slave: slave element to add
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*
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* Add a virtual slave control to the given master element created via
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* snd_ctl_create_virtual_master() beforehand.
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* Returns zero if successful or a negative error code.
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*
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* All slaves must be the same type (returning the same information
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* via info callback). The fucntion doesn't check it, so it's your
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* responsibility.
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*
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* Also, some additional limitations:
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* at most two channels,
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* logarithmic volume control (dB level) thus no linear volume,
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* master can only attenuate the volume without gain
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*/
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static inline int
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snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
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{
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return _snd_ctl_add_slave(master, slave, 0);
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}
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/**
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* snd_ctl_add_slave_uncached - Add a virtual slave control
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* @master: vmaster element
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* @slave: slave element to add
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*
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* Add a virtual slave control to the given master.
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* Unlike snd_ctl_add_slave(), the element added via this function
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* is supposed to have volatile values, and get callback is called
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* at each time quried from the master.
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*
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* When the control peeks the hardware values directly and the value
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* can be changed by other means than the put callback of the element,
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* this function should be used to keep the value always up-to-date.
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*/
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static inline int
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snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
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struct snd_kcontrol *slave)
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{
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return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
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}
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#endif /* __SOUND_CONTROL_H */
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