2008-01-10 08:52:42 -07:00
|
|
|
/*
|
|
|
|
* Virtual master and slave controls
|
|
|
|
*
|
|
|
|
* Copyright (c) 2008 by Takashi Iwai <tiwai@suse.de>
|
|
|
|
*
|
|
|
|
* 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, version 2.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/slab.h>
|
2011-09-22 07:34:58 -06:00
|
|
|
#include <linux/export.h>
|
2008-01-10 08:52:42 -07:00
|
|
|
#include <sound/core.h>
|
|
|
|
#include <sound/control.h>
|
2008-02-18 05:05:50 -07:00
|
|
|
#include <sound/tlv.h>
|
2008-01-10 08:52:42 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* a subset of information returned via ctl info callback
|
|
|
|
*/
|
|
|
|
struct link_ctl_info {
|
2011-02-14 03:00:47 -07:00
|
|
|
snd_ctl_elem_type_t type; /* value type */
|
2008-01-10 08:52:42 -07:00
|
|
|
int count; /* item count */
|
|
|
|
int min_val, max_val; /* min, max values */
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* link master - this contains a list of slave controls that are
|
|
|
|
* identical types, i.e. info returns the same value type and value
|
|
|
|
* ranges, but may have different number of counts.
|
|
|
|
*
|
|
|
|
* The master control is so far only mono volume/switch for simplicity.
|
|
|
|
* The same value will be applied to all slaves.
|
|
|
|
*/
|
|
|
|
struct link_master {
|
|
|
|
struct list_head slaves;
|
|
|
|
struct link_ctl_info info;
|
|
|
|
int val; /* the master value */
|
2008-02-18 05:05:50 -07:00
|
|
|
unsigned int tlv[4];
|
2012-03-12 05:18:37 -06:00
|
|
|
void (*hook)(void *private_data, int);
|
|
|
|
void *hook_private_data;
|
2008-01-10 08:52:42 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* link slave - this contains a slave control element
|
|
|
|
*
|
|
|
|
* It fakes the control callbacsk with additional attenuation by the
|
|
|
|
* master control. A slave may have either one or two channels.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct link_slave {
|
|
|
|
struct list_head list;
|
|
|
|
struct link_master *master;
|
|
|
|
struct link_ctl_info info;
|
|
|
|
int vals[2]; /* current values */
|
2009-01-16 10:15:22 -07:00
|
|
|
unsigned int flags;
|
2011-11-10 04:34:24 -07:00
|
|
|
struct snd_kcontrol *kctl; /* original kcontrol pointer */
|
2008-01-10 08:52:42 -07:00
|
|
|
struct snd_kcontrol slave; /* the copy of original control entry */
|
|
|
|
};
|
|
|
|
|
2009-01-16 10:15:22 -07:00
|
|
|
static int slave_update(struct link_slave *slave)
|
|
|
|
{
|
|
|
|
struct snd_ctl_elem_value *uctl;
|
|
|
|
int err, ch;
|
|
|
|
|
2018-03-08 00:32:41 -07:00
|
|
|
uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
|
2009-01-16 10:15:22 -07:00
|
|
|
if (!uctl)
|
|
|
|
return -ENOMEM;
|
|
|
|
uctl->id = slave->slave.id;
|
|
|
|
err = slave->slave.get(&slave->slave, uctl);
|
2018-03-08 00:26:48 -07:00
|
|
|
if (err < 0)
|
|
|
|
goto error;
|
2009-01-16 10:15:22 -07:00
|
|
|
for (ch = 0; ch < slave->info.count; ch++)
|
|
|
|
slave->vals[ch] = uctl->value.integer.value[ch];
|
2018-03-08 00:26:48 -07:00
|
|
|
error:
|
2009-01-16 10:15:22 -07:00
|
|
|
kfree(uctl);
|
2018-03-08 00:26:48 -07:00
|
|
|
return err < 0 ? err : 0;
|
2009-01-16 10:15:22 -07:00
|
|
|
}
|
|
|
|
|
2008-01-10 08:52:42 -07:00
|
|
|
/* get the slave ctl info and save the initial values */
|
|
|
|
static int slave_init(struct link_slave *slave)
|
|
|
|
{
|
|
|
|
struct snd_ctl_elem_info *uinfo;
|
2009-01-16 10:15:22 -07:00
|
|
|
int err;
|
2008-01-10 08:52:42 -07:00
|
|
|
|
2009-01-16 10:15:22 -07:00
|
|
|
if (slave->info.count) {
|
|
|
|
/* already initialized */
|
|
|
|
if (slave->flags & SND_CTL_SLAVE_NEED_UPDATE)
|
|
|
|
return slave_update(slave);
|
|
|
|
return 0;
|
|
|
|
}
|
2008-01-10 08:52:42 -07:00
|
|
|
|
|
|
|
uinfo = kmalloc(sizeof(*uinfo), GFP_KERNEL);
|
|
|
|
if (!uinfo)
|
|
|
|
return -ENOMEM;
|
|
|
|
uinfo->id = slave->slave.id;
|
|
|
|
err = slave->slave.info(&slave->slave, uinfo);
|
|
|
|
if (err < 0) {
|
|
|
|
kfree(uinfo);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
slave->info.type = uinfo->type;
|
|
|
|
slave->info.count = uinfo->count;
|
|
|
|
if (slave->info.count > 2 ||
|
|
|
|
(slave->info.type != SNDRV_CTL_ELEM_TYPE_INTEGER &&
|
|
|
|
slave->info.type != SNDRV_CTL_ELEM_TYPE_BOOLEAN)) {
|
2014-02-04 10:21:03 -07:00
|
|
|
pr_err("ALSA: vmaster: invalid slave element\n");
|
2008-01-10 08:52:42 -07:00
|
|
|
kfree(uinfo);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
slave->info.min_val = uinfo->value.integer.min;
|
|
|
|
slave->info.max_val = uinfo->value.integer.max;
|
|
|
|
kfree(uinfo);
|
|
|
|
|
2009-01-16 10:15:22 -07:00
|
|
|
return slave_update(slave);
|
2008-01-10 08:52:42 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
/* initialize master volume */
|
|
|
|
static int master_init(struct link_master *master)
|
|
|
|
{
|
|
|
|
struct link_slave *slave;
|
|
|
|
|
|
|
|
if (master->info.count)
|
|
|
|
return 0; /* already initialized */
|
|
|
|
|
|
|
|
list_for_each_entry(slave, &master->slaves, list) {
|
|
|
|
int err = slave_init(slave);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
master->info = slave->info;
|
|
|
|
master->info.count = 1; /* always mono */
|
|
|
|
/* set full volume as default (= no attenuation) */
|
|
|
|
master->val = master->info.max_val;
|
2012-03-12 05:18:37 -06:00
|
|
|
if (master->hook)
|
|
|
|
master->hook(master->hook_private_data, master->val);
|
|
|
|
return 1;
|
2008-01-10 08:52:42 -07:00
|
|
|
}
|
|
|
|
return -ENOENT;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int slave_get_val(struct link_slave *slave,
|
|
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
|
|
{
|
|
|
|
int err, ch;
|
|
|
|
|
|
|
|
err = slave_init(slave);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
for (ch = 0; ch < slave->info.count; ch++)
|
|
|
|
ucontrol->value.integer.value[ch] = slave->vals[ch];
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int slave_put_val(struct link_slave *slave,
|
|
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
|
|
{
|
|
|
|
int err, ch, vol;
|
|
|
|
|
|
|
|
err = master_init(slave->master);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
switch (slave->info.type) {
|
|
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
|
|
for (ch = 0; ch < slave->info.count; ch++)
|
|
|
|
ucontrol->value.integer.value[ch] &=
|
|
|
|
!!slave->master->val;
|
|
|
|
break;
|
|
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER:
|
|
|
|
for (ch = 0; ch < slave->info.count; ch++) {
|
|
|
|
/* max master volume is supposed to be 0 dB */
|
|
|
|
vol = ucontrol->value.integer.value[ch];
|
|
|
|
vol += slave->master->val - slave->master->info.max_val;
|
|
|
|
if (vol < slave->info.min_val)
|
|
|
|
vol = slave->info.min_val;
|
|
|
|
else if (vol > slave->info.max_val)
|
|
|
|
vol = slave->info.max_val;
|
|
|
|
ucontrol->value.integer.value[ch] = vol;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return slave->slave.put(&slave->slave, ucontrol);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ctl callbacks for slaves
|
|
|
|
*/
|
|
|
|
static int slave_info(struct snd_kcontrol *kcontrol,
|
|
|
|
struct snd_ctl_elem_info *uinfo)
|
|
|
|
{
|
|
|
|
struct link_slave *slave = snd_kcontrol_chip(kcontrol);
|
|
|
|
return slave->slave.info(&slave->slave, uinfo);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int slave_get(struct snd_kcontrol *kcontrol,
|
|
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
|
|
{
|
|
|
|
struct link_slave *slave = snd_kcontrol_chip(kcontrol);
|
|
|
|
return slave_get_val(slave, ucontrol);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int slave_put(struct snd_kcontrol *kcontrol,
|
|
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
|
|
{
|
|
|
|
struct link_slave *slave = snd_kcontrol_chip(kcontrol);
|
|
|
|
int err, ch, changed = 0;
|
|
|
|
|
|
|
|
err = slave_init(slave);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
for (ch = 0; ch < slave->info.count; ch++) {
|
|
|
|
if (slave->vals[ch] != ucontrol->value.integer.value[ch]) {
|
|
|
|
changed = 1;
|
|
|
|
slave->vals[ch] = ucontrol->value.integer.value[ch];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (!changed)
|
|
|
|
return 0;
|
2013-03-05 07:43:39 -07:00
|
|
|
err = slave_put_val(slave, ucontrol);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
return 1;
|
2008-01-10 08:52:42 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static int slave_tlv_cmd(struct snd_kcontrol *kcontrol,
|
|
|
|
int op_flag, unsigned int size,
|
|
|
|
unsigned int __user *tlv)
|
|
|
|
{
|
|
|
|
struct link_slave *slave = snd_kcontrol_chip(kcontrol);
|
|
|
|
/* FIXME: this assumes that the max volume is 0 dB */
|
|
|
|
return slave->slave.tlv.c(&slave->slave, op_flag, size, tlv);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void slave_free(struct snd_kcontrol *kcontrol)
|
|
|
|
{
|
|
|
|
struct link_slave *slave = snd_kcontrol_chip(kcontrol);
|
|
|
|
if (slave->slave.private_free)
|
|
|
|
slave->slave.private_free(&slave->slave);
|
|
|
|
if (slave->master)
|
|
|
|
list_del(&slave->list);
|
|
|
|
kfree(slave);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Add a slave control to the group with the given master control
|
|
|
|
*
|
|
|
|
* All slaves must be the same type (returning the same information
|
2011-03-30 19:57:33 -06:00
|
|
|
* via info callback). The function doesn't check it, so it's your
|
2008-01-10 08:52:42 -07:00
|
|
|
* responsibility.
|
|
|
|
*
|
|
|
|
* Also, some additional limitations:
|
|
|
|
* - at most two channels
|
|
|
|
* - logarithmic volume control (dB level), no linear volume
|
|
|
|
* - master can only attenuate the volume, no gain
|
|
|
|
*/
|
2009-01-16 10:15:22 -07:00
|
|
|
int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
|
|
|
|
unsigned int flags)
|
2008-01-10 08:52:42 -07:00
|
|
|
{
|
|
|
|
struct link_master *master_link = snd_kcontrol_chip(master);
|
|
|
|
struct link_slave *srec;
|
|
|
|
|
|
|
|
srec = kzalloc(sizeof(*srec) +
|
|
|
|
slave->count * sizeof(*slave->vd), GFP_KERNEL);
|
|
|
|
if (!srec)
|
|
|
|
return -ENOMEM;
|
2011-11-10 04:34:24 -07:00
|
|
|
srec->kctl = slave;
|
2008-01-10 08:52:42 -07:00
|
|
|
srec->slave = *slave;
|
|
|
|
memcpy(srec->slave.vd, slave->vd, slave->count * sizeof(*slave->vd));
|
|
|
|
srec->master = master_link;
|
2009-01-16 10:15:22 -07:00
|
|
|
srec->flags = flags;
|
2008-01-10 08:52:42 -07:00
|
|
|
|
|
|
|
/* override callbacks */
|
|
|
|
slave->info = slave_info;
|
|
|
|
slave->get = slave_get;
|
|
|
|
slave->put = slave_put;
|
|
|
|
if (slave->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)
|
|
|
|
slave->tlv.c = slave_tlv_cmd;
|
|
|
|
slave->private_data = srec;
|
|
|
|
slave->private_free = slave_free;
|
|
|
|
|
|
|
|
list_add_tail(&srec->list, &master_link->slaves);
|
|
|
|
return 0;
|
|
|
|
}
|
2009-01-16 10:15:22 -07:00
|
|
|
EXPORT_SYMBOL(_snd_ctl_add_slave);
|
2008-02-18 05:03:13 -07:00
|
|
|
|
2008-01-10 08:52:42 -07:00
|
|
|
/*
|
|
|
|
* ctl callbacks for master controls
|
|
|
|
*/
|
|
|
|
static int master_info(struct snd_kcontrol *kcontrol,
|
|
|
|
struct snd_ctl_elem_info *uinfo)
|
|
|
|
{
|
|
|
|
struct link_master *master = snd_kcontrol_chip(kcontrol);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = master_init(master);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
uinfo->type = master->info.type;
|
|
|
|
uinfo->count = master->info.count;
|
|
|
|
uinfo->value.integer.min = master->info.min_val;
|
|
|
|
uinfo->value.integer.max = master->info.max_val;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int master_get(struct snd_kcontrol *kcontrol,
|
|
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
|
|
{
|
|
|
|
struct link_master *master = snd_kcontrol_chip(kcontrol);
|
|
|
|
int err = master_init(master);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
ucontrol->value.integer.value[0] = master->val;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-06-24 07:51:54 -06:00
|
|
|
static int sync_slaves(struct link_master *master, int old_val, int new_val)
|
2008-01-10 08:52:42 -07:00
|
|
|
{
|
|
|
|
struct link_slave *slave;
|
|
|
|
struct snd_ctl_elem_value *uval;
|
|
|
|
|
|
|
|
uval = kmalloc(sizeof(*uval), GFP_KERNEL);
|
|
|
|
if (!uval)
|
|
|
|
return -ENOMEM;
|
|
|
|
list_for_each_entry(slave, &master->slaves, list) {
|
|
|
|
master->val = old_val;
|
|
|
|
uval->id = slave->slave.id;
|
|
|
|
slave_get_val(slave, uval);
|
2013-06-24 07:51:54 -06:00
|
|
|
master->val = new_val;
|
2008-01-10 08:52:42 -07:00
|
|
|
slave_put_val(slave, uval);
|
|
|
|
}
|
|
|
|
kfree(uval);
|
2013-06-24 07:51:54 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int master_put(struct snd_kcontrol *kcontrol,
|
|
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
|
|
{
|
|
|
|
struct link_master *master = snd_kcontrol_chip(kcontrol);
|
|
|
|
int err, new_val, old_val;
|
|
|
|
bool first_init;
|
|
|
|
|
|
|
|
err = master_init(master);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
first_init = err;
|
|
|
|
old_val = master->val;
|
|
|
|
new_val = ucontrol->value.integer.value[0];
|
|
|
|
if (new_val == old_val)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err = sync_slaves(master, old_val, new_val);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
2013-07-03 06:01:32 -06:00
|
|
|
if (master->hook && !first_init)
|
2012-03-12 05:18:37 -06:00
|
|
|
master->hook(master->hook_private_data, master->val);
|
2008-01-10 08:52:42 -07:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void master_free(struct snd_kcontrol *kcontrol)
|
|
|
|
{
|
|
|
|
struct link_master *master = snd_kcontrol_chip(kcontrol);
|
2011-11-10 04:34:24 -07:00
|
|
|
struct link_slave *slave, *n;
|
|
|
|
|
|
|
|
/* free all slave links and retore the original slave kctls */
|
|
|
|
list_for_each_entry_safe(slave, n, &master->slaves, list) {
|
|
|
|
struct snd_kcontrol *sctl = slave->kctl;
|
|
|
|
struct list_head olist = sctl->list;
|
|
|
|
memcpy(sctl, &slave->slave, sizeof(*sctl));
|
|
|
|
memcpy(sctl->vd, slave->slave.vd,
|
|
|
|
sctl->count * sizeof(*sctl->vd));
|
|
|
|
sctl->list = olist; /* keep the current linked-list */
|
|
|
|
kfree(slave);
|
|
|
|
}
|
2008-01-10 08:52:42 -07:00
|
|
|
kfree(master);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-02-09 06:47:19 -07:00
|
|
|
/**
|
|
|
|
* snd_ctl_make_virtual_master - Create a virtual master control
|
|
|
|
* @name: name string of the control element to create
|
|
|
|
* @tlv: optional TLV int array for dB information
|
|
|
|
*
|
2013-03-11 15:05:14 -06:00
|
|
|
* Creates a virtual master control with the given name string.
|
2009-02-09 06:47:19 -07:00
|
|
|
*
|
|
|
|
* After creating a vmaster element, you can add the slave controls
|
|
|
|
* via snd_ctl_add_slave() or snd_ctl_add_slave_uncached().
|
|
|
|
*
|
|
|
|
* The optional argument @tlv can be used to specify the TLV information
|
|
|
|
* for dB scale of the master control. It should be a single element
|
2009-06-16 05:57:07 -06:00
|
|
|
* with #SNDRV_CTL_TLVT_DB_SCALE, #SNDRV_CTL_TLV_DB_MINMAX or
|
|
|
|
* #SNDRV_CTL_TLVT_DB_MINMAX_MUTE type, and should be the max 0dB.
|
2013-03-11 15:05:14 -06:00
|
|
|
*
|
|
|
|
* Return: The created control element, or %NULL for errors (ENOMEM).
|
2008-01-10 08:52:42 -07:00
|
|
|
*/
|
|
|
|
struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
|
|
|
|
const unsigned int *tlv)
|
|
|
|
{
|
|
|
|
struct link_master *master;
|
|
|
|
struct snd_kcontrol *kctl;
|
|
|
|
struct snd_kcontrol_new knew;
|
|
|
|
|
|
|
|
memset(&knew, 0, sizeof(knew));
|
|
|
|
knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
|
|
|
|
knew.name = name;
|
|
|
|
knew.info = master_info;
|
|
|
|
|
|
|
|
master = kzalloc(sizeof(*master), GFP_KERNEL);
|
|
|
|
if (!master)
|
|
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&master->slaves);
|
|
|
|
|
|
|
|
kctl = snd_ctl_new1(&knew, master);
|
|
|
|
if (!kctl) {
|
|
|
|
kfree(master);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
/* override some callbacks */
|
|
|
|
kctl->info = master_info;
|
|
|
|
kctl->get = master_get;
|
|
|
|
kctl->put = master_put;
|
|
|
|
kctl->private_free = master_free;
|
|
|
|
|
|
|
|
/* additional (constant) TLV read */
|
2009-06-16 05:57:07 -06:00
|
|
|
if (tlv &&
|
|
|
|
(tlv[0] == SNDRV_CTL_TLVT_DB_SCALE ||
|
|
|
|
tlv[0] == SNDRV_CTL_TLVT_DB_MINMAX ||
|
|
|
|
tlv[0] == SNDRV_CTL_TLVT_DB_MINMAX_MUTE)) {
|
2008-01-10 08:52:42 -07:00
|
|
|
kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
|
2008-02-18 05:05:50 -07:00
|
|
|
memcpy(master->tlv, tlv, sizeof(master->tlv));
|
|
|
|
kctl->tlv.p = master->tlv;
|
2008-01-10 08:52:42 -07:00
|
|
|
}
|
2008-02-18 05:05:50 -07:00
|
|
|
|
2008-01-10 08:52:42 -07:00
|
|
|
return kctl;
|
|
|
|
}
|
2008-02-18 05:03:13 -07:00
|
|
|
EXPORT_SYMBOL(snd_ctl_make_virtual_master);
|
2012-03-12 05:18:37 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* snd_ctl_add_vmaster_hook - Add a hook to a vmaster control
|
|
|
|
* @kcontrol: vmaster kctl element
|
|
|
|
* @hook: the hook function
|
2012-04-17 18:03:42 -06:00
|
|
|
* @private_data: the private_data pointer to be saved
|
2012-03-12 05:18:37 -06:00
|
|
|
*
|
|
|
|
* Adds the given hook to the vmaster control element so that it's called
|
|
|
|
* at each time when the value is changed.
|
2013-03-11 15:05:14 -06:00
|
|
|
*
|
|
|
|
* Return: Zero.
|
2012-03-12 05:18:37 -06:00
|
|
|
*/
|
|
|
|
int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kcontrol,
|
|
|
|
void (*hook)(void *private_data, int),
|
|
|
|
void *private_data)
|
|
|
|
{
|
|
|
|
struct link_master *master = snd_kcontrol_chip(kcontrol);
|
|
|
|
master->hook = hook;
|
|
|
|
master->hook_private_data = private_data;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(snd_ctl_add_vmaster_hook);
|
|
|
|
|
|
|
|
/**
|
2013-06-24 07:51:54 -06:00
|
|
|
* snd_ctl_sync_vmaster - Sync the vmaster slaves and hook
|
2012-03-12 05:18:37 -06:00
|
|
|
* @kcontrol: vmaster kctl element
|
2013-06-24 07:51:54 -06:00
|
|
|
* @hook_only: sync only the hook
|
2012-03-12 05:18:37 -06:00
|
|
|
*
|
2013-06-24 07:51:54 -06:00
|
|
|
* Forcibly call the put callback of each slave and call the hook function
|
|
|
|
* to synchronize with the current value of the given vmaster element.
|
|
|
|
* NOP when NULL is passed to @kcontrol.
|
2012-03-12 05:18:37 -06:00
|
|
|
*/
|
2013-06-24 07:51:54 -06:00
|
|
|
void snd_ctl_sync_vmaster(struct snd_kcontrol *kcontrol, bool hook_only)
|
2012-03-12 05:18:37 -06:00
|
|
|
{
|
|
|
|
struct link_master *master;
|
2013-06-24 07:51:54 -06:00
|
|
|
bool first_init = false;
|
|
|
|
|
2012-03-12 05:18:37 -06:00
|
|
|
if (!kcontrol)
|
|
|
|
return;
|
|
|
|
master = snd_kcontrol_chip(kcontrol);
|
2013-06-24 07:51:54 -06:00
|
|
|
if (!hook_only) {
|
|
|
|
int err = master_init(master);
|
|
|
|
if (err < 0)
|
|
|
|
return;
|
|
|
|
first_init = err;
|
|
|
|
err = sync_slaves(master, master->val, master->val);
|
|
|
|
if (err < 0)
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (master->hook && !first_init)
|
2012-03-12 05:18:37 -06:00
|
|
|
master->hook(master->hook_private_data, master->val);
|
|
|
|
}
|
2013-06-24 07:51:54 -06:00
|
|
|
EXPORT_SYMBOL_GPL(snd_ctl_sync_vmaster);
|
ALSA: hda - Fix incorrect TLV callback check introduced during set_fs() removal
The commit 99b5c5bb9a54 ("ALSA: hda - Remove the use of set_fs()")
converted the get_kctl_0dB_offset() call for killing set_fs() usage in
HD-audio codec code. The conversion assumed that the TLV callback
used in HD-audio code is only snd_hda_mixer_amp() and applies the TLV
calculation locally.
Although this assumption is correct, and all slave kctls are actually
with that callback, the current code is still utterly buggy; it
doesn't hit this condition and falls back to the next check. It's
because the function gets called after adding slave kctls to vmaster.
By assigning a slave kctl, the slave kctl object is faked inside
vmaster code, and the whole kctl ops are overridden. Thus the
callback op points to a different value from what we've assumed.
More badly, as reported by the KERNEXEC and UDEREF features of PaX,
the code flow turns into the unexpected pitfall. The next fallback
check is SNDRV_CTL_ELEM_ACCESS_TLV_READ access bit, and this always
hits for each kctl with TLV. Then it evaluates the callback function
pointer wrongly as if it were a TLV array. Although currently its
side-effect is fairly limited, this incorrect reference may lead to an
unpleasant result.
For addressing the regression, this patch introduces a new helper to
vmaster code, snd_ctl_apply_vmaster_slaves(). This works similarly
like the existing map_slaves() in hda_codec.c: it loops over the slave
list of the given master, and applies the given function to each
slave. Then the initializer function receives the right kctl object
and we can compare the correct pointer instead of the faked one.
Also, for catching the similar breakage in future, give an error
message when the unexpected TLV callback is found and bail out
immediately.
Fixes: 99b5c5bb9a54 ("ALSA: hda - Remove the use of set_fs()")
Reported-by: PaX Team <pageexec@freemail.hu>
Cc: <stable@vger.kernel.org> # v4.13
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-10-16 03:39:28 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* snd_ctl_apply_vmaster_slaves - Apply function to each vmaster slave
|
|
|
|
* @kctl: vmaster kctl element
|
|
|
|
* @func: function to apply
|
|
|
|
* @arg: optional function argument
|
|
|
|
*
|
|
|
|
* Apply the function @func to each slave kctl of the given vmaster kctl.
|
|
|
|
* Returns 0 if successful, or a negative error code.
|
|
|
|
*/
|
|
|
|
int snd_ctl_apply_vmaster_slaves(struct snd_kcontrol *kctl,
|
2017-11-22 04:34:56 -07:00
|
|
|
int (*func)(struct snd_kcontrol *vslave,
|
|
|
|
struct snd_kcontrol *slave,
|
|
|
|
void *arg),
|
ALSA: hda - Fix incorrect TLV callback check introduced during set_fs() removal
The commit 99b5c5bb9a54 ("ALSA: hda - Remove the use of set_fs()")
converted the get_kctl_0dB_offset() call for killing set_fs() usage in
HD-audio codec code. The conversion assumed that the TLV callback
used in HD-audio code is only snd_hda_mixer_amp() and applies the TLV
calculation locally.
Although this assumption is correct, and all slave kctls are actually
with that callback, the current code is still utterly buggy; it
doesn't hit this condition and falls back to the next check. It's
because the function gets called after adding slave kctls to vmaster.
By assigning a slave kctl, the slave kctl object is faked inside
vmaster code, and the whole kctl ops are overridden. Thus the
callback op points to a different value from what we've assumed.
More badly, as reported by the KERNEXEC and UDEREF features of PaX,
the code flow turns into the unexpected pitfall. The next fallback
check is SNDRV_CTL_ELEM_ACCESS_TLV_READ access bit, and this always
hits for each kctl with TLV. Then it evaluates the callback function
pointer wrongly as if it were a TLV array. Although currently its
side-effect is fairly limited, this incorrect reference may lead to an
unpleasant result.
For addressing the regression, this patch introduces a new helper to
vmaster code, snd_ctl_apply_vmaster_slaves(). This works similarly
like the existing map_slaves() in hda_codec.c: it loops over the slave
list of the given master, and applies the given function to each
slave. Then the initializer function receives the right kctl object
and we can compare the correct pointer instead of the faked one.
Also, for catching the similar breakage in future, give an error
message when the unexpected TLV callback is found and bail out
immediately.
Fixes: 99b5c5bb9a54 ("ALSA: hda - Remove the use of set_fs()")
Reported-by: PaX Team <pageexec@freemail.hu>
Cc: <stable@vger.kernel.org> # v4.13
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-10-16 03:39:28 -06:00
|
|
|
void *arg)
|
|
|
|
{
|
|
|
|
struct link_master *master;
|
|
|
|
struct link_slave *slave;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
master = snd_kcontrol_chip(kctl);
|
|
|
|
err = master_init(master);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
list_for_each_entry(slave, &master->slaves, list) {
|
2017-11-22 04:34:56 -07:00
|
|
|
err = func(slave->kctl, &slave->slave, arg);
|
ALSA: hda - Fix incorrect TLV callback check introduced during set_fs() removal
The commit 99b5c5bb9a54 ("ALSA: hda - Remove the use of set_fs()")
converted the get_kctl_0dB_offset() call for killing set_fs() usage in
HD-audio codec code. The conversion assumed that the TLV callback
used in HD-audio code is only snd_hda_mixer_amp() and applies the TLV
calculation locally.
Although this assumption is correct, and all slave kctls are actually
with that callback, the current code is still utterly buggy; it
doesn't hit this condition and falls back to the next check. It's
because the function gets called after adding slave kctls to vmaster.
By assigning a slave kctl, the slave kctl object is faked inside
vmaster code, and the whole kctl ops are overridden. Thus the
callback op points to a different value from what we've assumed.
More badly, as reported by the KERNEXEC and UDEREF features of PaX,
the code flow turns into the unexpected pitfall. The next fallback
check is SNDRV_CTL_ELEM_ACCESS_TLV_READ access bit, and this always
hits for each kctl with TLV. Then it evaluates the callback function
pointer wrongly as if it were a TLV array. Although currently its
side-effect is fairly limited, this incorrect reference may lead to an
unpleasant result.
For addressing the regression, this patch introduces a new helper to
vmaster code, snd_ctl_apply_vmaster_slaves(). This works similarly
like the existing map_slaves() in hda_codec.c: it loops over the slave
list of the given master, and applies the given function to each
slave. Then the initializer function receives the right kctl object
and we can compare the correct pointer instead of the faked one.
Also, for catching the similar breakage in future, give an error
message when the unexpected TLV callback is found and bail out
immediately.
Fixes: 99b5c5bb9a54 ("ALSA: hda - Remove the use of set_fs()")
Reported-by: PaX Team <pageexec@freemail.hu>
Cc: <stable@vger.kernel.org> # v4.13
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-10-16 03:39:28 -06:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(snd_ctl_apply_vmaster_slaves);
|