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Diffstat (limited to 'include/sound/control.h')
| -rw-r--r-- | include/sound/control.h | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/include/sound/control.h b/include/sound/control.h new file mode 100644 index 00000000..1a94a216 --- /dev/null +++ b/include/sound/control.h @@ -0,0 +1,230 @@ +#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 */ + 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. + * Returns zero if successful or a negative error code. + * + * 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 + */ +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. + */ +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); +} + +#endif /* __SOUND_CONTROL_H */ |