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include/sound/control.h
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#ifndef __SOUND_CONTROL_H #define __SOUND_CONTROL_H /* * Header file for control interface |
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
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* * * 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> |
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#define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data) |
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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); |
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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); |
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struct snd_kcontrol_new { |
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snd_ctl_elem_iface_t iface; /* interface identifier */ unsigned int device; /* device/client number */ unsigned int subdevice; /* subdevice (substream) number */ 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; |
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union { 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 { struct snd_ctl_file *owner; /* locked */ |
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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 */ snd_kcontrol_info_t *info; snd_kcontrol_get_t *get; snd_kcontrol_put_t *put; |
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union { 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; void *private_data; |
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void (*private_free)(struct snd_kcontrol *kcontrol); 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 pid; |
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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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struct pid *pid; |
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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 */ }; |
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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, struct snd_ctl_file * control, 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); 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_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); 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); |
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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); 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 |
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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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{ return id->numid - kctl->id.numid; } |
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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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{ return id->index - kctl->id.index; } |
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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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{ if (id->numid) { return snd_ctl_get_ioffnum(kctl, id); } else { return snd_ctl_get_ioffidx(kctl, id); } } |
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static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id, struct snd_kcontrol *src_kctl, |
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unsigned int offset) { *dst_id = src_kctl->id; dst_id->index += offset; dst_id->numid += offset; return dst_id; } |
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/* * Frequently used control callbacks */ 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); |
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/* * virtual master control */ struct snd_kcontrol *snd_ctl_make_virtual_master(char *name, const unsigned int *tlv); |
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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) |
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/** * 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. * Returns zero if successful or a negative error code. * * All slaves must be the same type (returning the same information * via info callback). The fucntion 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 */ |
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static inline int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave) { return _snd_ctl_add_slave(master, slave, 0); } |
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/** * 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. */ |
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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); } |
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#endif /* __SOUND_CONTROL_H */ |