[ALSA] Control API - TLV implementation for additional information like dB scale
This patch implements a TLV mechanism to transfer an additional information like dB scale to the user space. The types might be extended in future. Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Jaroslav Kysela
parent
3eeab61aa3
commit
42750b04c5
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@ -688,7 +688,7 @@ struct snd_timer_tread {
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* *
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****************************************************************************/
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#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 3)
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#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 4)
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struct snd_ctl_card_info {
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int card; /* card number */
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@ -818,6 +818,12 @@ struct snd_ctl_elem_value {
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unsigned char reserved[128-sizeof(struct timespec)];
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};
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struct snd_ctl_tlv {
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unsigned int numid; /* control element numeric identification */
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unsigned int length; /* in bytes aligned to 4 */
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unsigned int tlv[0]; /* first TLV */
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};
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enum {
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SNDRV_CTL_IOCTL_PVERSION = _IOR('U', 0x00, int),
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SNDRV_CTL_IOCTL_CARD_INFO = _IOR('U', 0x01, struct snd_ctl_card_info),
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@ -831,6 +837,7 @@ enum {
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SNDRV_CTL_IOCTL_ELEM_ADD = _IOWR('U', 0x17, struct snd_ctl_elem_info),
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SNDRV_CTL_IOCTL_ELEM_REPLACE = _IOWR('U', 0x18, struct snd_ctl_elem_info),
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SNDRV_CTL_IOCTL_ELEM_REMOVE = _IOWR('U', 0x19, struct snd_ctl_elem_id),
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SNDRV_CTL_IOCTL_TLV_READ = _IOWR('U', 0x1a, struct snd_ctl_tlv),
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SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE = _IOWR('U', 0x20, int),
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SNDRV_CTL_IOCTL_HWDEP_INFO = _IOR('U', 0x21, struct snd_hwdep_info),
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SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE = _IOR('U', 0x30, int),
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@ -42,6 +42,7 @@ struct snd_kcontrol_new {
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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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unsigned int *tlv;
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unsigned long private_value;
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};
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@ -58,6 +59,7 @@ struct snd_kcontrol {
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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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unsigned int *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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@ -0,0 +1,43 @@
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#ifndef __SOUND_TLV_H
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#define __SOUND_TLV_H
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/*
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* Advanced Linux Sound Architecture - ALSA - Driver
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* Copyright (c) 2006 by Jaroslav Kysela <perex@suse.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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/*
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* TLV structure is right behind the struct snd_ctl_tlv:
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* unsigned int type - see SNDRV_CTL_TLVT_*
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* unsigned int length
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* .... data aligned to sizeof(unsigned int), use
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* block_length = (length + (sizeof(unsigned int) - 1)) &
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* ~(sizeof(unsigned int) - 1)) ....
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*/
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#define SNDRV_CTL_TLVT_CONTAINER 0 /* one level down - group of TLVs */
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#define SNDRV_CTL_TLVT_DB_SCALE 1 /* dB scale */
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#define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVT_DB_SCALE, 2 * sizeof(unsigned int), \
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(min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0) \
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}
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#endif /* __SOUND_TLV_H */
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@ -241,6 +241,7 @@ struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
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kctl.info = ncontrol->info;
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kctl.get = ncontrol->get;
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kctl.put = ncontrol->put;
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kctl.tlv = ncontrol->tlv;
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kctl.private_value = ncontrol->private_value;
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kctl.private_data = private_data;
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return snd_ctl_new(&kctl, access);
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@ -1067,6 +1068,40 @@ static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
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return 0;
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}
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static int snd_ctl_tlv_read(struct snd_card *card,
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struct snd_ctl_tlv __user *_tlv)
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{
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struct snd_ctl_tlv tlv;
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struct snd_kcontrol *kctl;
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unsigned int len;
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int err = 0;
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if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
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return -EFAULT;
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if (tlv.length < sizeof(unsigned int) * 3)
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return -EINVAL;
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down_read(&card->controls_rwsem);
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kctl = snd_ctl_find_numid(card, tlv.numid);
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if (kctl == NULL) {
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err = -ENOENT;
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goto __kctl_end;
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}
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if (kctl->tlv == NULL) {
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err = -ENXIO;
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goto __kctl_end;
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}
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len = kctl->tlv[1] + 2 * sizeof(unsigned int);
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if (tlv.length < len) {
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err = -ENOMEM;
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goto __kctl_end;
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}
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if (copy_to_user(_tlv->tlv, kctl->tlv, len))
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err = -EFAULT;
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__kctl_end:
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up_read(&card->controls_rwsem);
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return err;
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}
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static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct snd_ctl_file *ctl;
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@ -1086,11 +1121,11 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg
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case SNDRV_CTL_IOCTL_CARD_INFO:
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return snd_ctl_card_info(card, ctl, cmd, argp);
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case SNDRV_CTL_IOCTL_ELEM_LIST:
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return snd_ctl_elem_list(ctl->card, argp);
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return snd_ctl_elem_list(card, argp);
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case SNDRV_CTL_IOCTL_ELEM_INFO:
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return snd_ctl_elem_info_user(ctl, argp);
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case SNDRV_CTL_IOCTL_ELEM_READ:
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return snd_ctl_elem_read_user(ctl->card, argp);
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return snd_ctl_elem_read_user(card, argp);
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case SNDRV_CTL_IOCTL_ELEM_WRITE:
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return snd_ctl_elem_write_user(ctl, argp);
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case SNDRV_CTL_IOCTL_ELEM_LOCK:
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@ -1105,6 +1140,8 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg
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return snd_ctl_elem_remove(ctl, argp);
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case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
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return snd_ctl_subscribe_events(ctl, ip);
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case SNDRV_CTL_IOCTL_TLV_READ:
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return snd_ctl_tlv_read(card, argp);
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case SNDRV_CTL_IOCTL_POWER:
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return -ENOPROTOOPT;
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case SNDRV_CTL_IOCTL_POWER_STATE:
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@ -70,9 +70,12 @@
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#include <sound/pcm.h>
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#include <sound/ac97_codec.h>
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#include <sound/info.h>
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#include <sound/tlv.h>
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#include "ca0106.h"
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static DECLARE_TLV_DB_SCALE(snd_ca0106_db_scale, -5150, 75, 1);
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static int snd_ca0106_shared_spdif_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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@ -472,6 +475,7 @@ static int snd_ca0106_i2c_volume_put(struct snd_kcontrol *kcontrol,
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.info = snd_ca0106_volume_info, \
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.get = snd_ca0106_volume_get, \
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.put = snd_ca0106_volume_put, \
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.tlv = snd_ca0106_db_scale, \
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.private_value = ((chid) << 8) | (reg) \
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}
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