ALSA: add snd_ctl_add_slave_uncached()

[linux-2.6-omap-h63xx.git] / sound / core / vmaster.c

diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 4cc57f902e2c9ac03f8b8e6216be27738430d385..d51b198d06d9ee9e0e556417bfc14a3216b82174 100644 (file)
--- 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
@@ -367,5 +380,4 @@ struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
 
        return kctl;
 }
-
 EXPORT_SYMBOL(snd_ctl_make_virtual_master);