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Diffstat (limited to 'sound')
-rw-r--r--sound/core/vmaster.c62
1 files changed, 43 insertions, 19 deletions
diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 4cc57f902e2c..257624bd1997 100644
--- a/sound/core/vmaster.c
+++ b/sound/core/vmaster.c
@@ -50,18 +50,38 @@ struct link_slave {
struct link_master *master;
struct link_ctl_info info;
int vals[2]; /* current values */
+ unsigned int flags;
struct snd_kcontrol slave; /* the copy of original control entry */
};
+static int slave_update(struct link_slave *slave)
+{
+ struct snd_ctl_elem_value *uctl;
+ int err, ch;
+
+ uctl = kmalloc(sizeof(*uctl), GFP_KERNEL);
+ if (!uctl)
+ return -ENOMEM;
+ uctl->id = slave->slave.id;
+ err = slave->slave.get(&slave->slave, uctl);
+ for (ch = 0; ch < slave->info.count; ch++)
+ slave->vals[ch] = uctl->value.integer.value[ch];
+ kfree(uctl);
+ return 0;
+}
+
/* get the slave ctl info and save the initial values */
static int slave_init(struct link_slave *slave)
{
struct snd_ctl_elem_info *uinfo;
- struct snd_ctl_elem_value *uctl;
- int err, ch;
+ int err;
- if (slave->info.count)
- return 0; /* already initialized */
+ if (slave->info.count) {
+ /* already initialized */
+ if (slave->flags & SND_CTL_SLAVE_NEED_UPDATE)
+ return slave_update(slave);
+ return 0;
+ }
uinfo = kmalloc(sizeof(*uinfo), GFP_KERNEL);
if (!uinfo)
@@ -85,15 +105,7 @@ static int slave_init(struct link_slave *slave)
slave->info.max_val = uinfo->value.integer.max;
kfree(uinfo);
- uctl = kmalloc(sizeof(*uctl), GFP_KERNEL);
- if (!uctl)
- return -ENOMEM;
- uctl->id = slave->slave.id;
- err = slave->slave.get(&slave->slave, uctl);
- for (ch = 0; ch < slave->info.count; ch++)
- slave->vals[ch] = uctl->value.integer.value[ch];
- kfree(uctl);
- return 0;
+ return slave_update(slave);
}
/* initialize master volume */
@@ -229,7 +241,8 @@ static void slave_free(struct snd_kcontrol *kcontrol)
* - logarithmic volume control (dB level), no linear volume
* - master can only attenuate the volume, no gain
*/
-int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
+int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
+ unsigned int flags)
{
struct link_master *master_link = snd_kcontrol_chip(master);
struct link_slave *srec;
@@ -241,6 +254,7 @@ int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
srec->slave = *slave;
memcpy(srec->slave.vd, slave->vd, slave->count * sizeof(*slave->vd));
srec->master = master_link;
+ srec->flags = flags;
/* override callbacks */
slave->info = slave_info;
@@ -254,8 +268,7 @@ int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
list_add_tail(&srec->list, &master_link->slaves);
return 0;
}
-
-EXPORT_SYMBOL(snd_ctl_add_slave);
+EXPORT_SYMBOL(_snd_ctl_add_slave);
/*
* ctl callbacks for master controls
@@ -327,8 +340,20 @@ static void master_free(struct snd_kcontrol *kcontrol)
}
-/*
- * Create a virtual master control with the given name
+/**
+ * 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
+ *
+ * Creates a virtual matster control with the given name string.
+ * Returns the created control element, or NULL for errors (ENOMEM).
+ *
+ * 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
+ * with #SNDRV_CTL_TLVT_DB_SCALE type, and should be the max 0dB.
*/
struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
const unsigned int *tlv)
@@ -367,5 +392,4 @@ struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
return kctl;
}
-
EXPORT_SYMBOL(snd_ctl_make_virtual_master);