1 files changed, 364 insertions, 0 deletions

diff --git a/sound/pci/hda/vmaster.c b/sound/pci/hda/vmaster.c
new file mode 100644
index 000000000000..2da49d20a1fc
--- /dev/null
+++ b/sound/pci/hda/vmaster.c
@@ -0,0 +1,364 @@
+/*
+ * 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>
+#include <sound/core.h>
+#include <sound/control.h>
+
+/*
+ * a subset of information returned via ctl info callback
+ */
+struct link_ctl_info {
+        int type;               /* value type */
+        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 */
+};
+
+/*
+ * 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 */
+        struct snd_kcontrol slave; /* the copy of original control entry */
+};
+
+/* 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;
+
+        if (slave->info.count)
+                return 0; /* already initialized */
+
+        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)) {
+                snd_printk(KERN_ERR "invalid slave element\n");
+                kfree(uinfo);
+                return -EINVAL;
+        }
+        slave->info.min_val = uinfo->value.integer.min;
+        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;
+}
+
+/* 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;
+                return 0;
+        }
+        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;
+        return slave_put_val(slave, ucontrol);
+}
+
+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
+ * via info callback).  The fucntion doesn't check it, so it's your
+ * 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
+ */
+int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
+{
+        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;
+        srec->slave = *slave;
+        memcpy(srec->slave.vd, slave->vd, slave->count * sizeof(*slave->vd));
+        srec->master = master_link;
+
+        /* 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;
+}
+
+/*
+ * 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;
+}
+
+static int master_put(struct snd_kcontrol *kcontrol,
+                      struct snd_ctl_elem_value *ucontrol)
+{
+        struct link_master *master = snd_kcontrol_chip(kcontrol);
+        struct link_slave *slave;
+        struct snd_ctl_elem_value *uval;
+        int err, old_val;
+
+        err = master_init(master);
+        if (err < 0)
+                return err;
+        old_val = master->val;
+        if (ucontrol->value.integer.value[0] == old_val)
+                return 0;
+
+        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);
+                master->val = ucontrol->value.integer.value[0];
+                slave_put_val(slave, uval);
+        }
+        kfree(uval);
+        return 1;
+}
+
+static void master_free(struct snd_kcontrol *kcontrol)
+{
+        struct link_master *master = snd_kcontrol_chip(kcontrol);
+        struct link_slave *slave;
+
+        list_for_each_entry(slave, &master->slaves, list)
+                slave->master = NULL;
+        kfree(master);
+}
+
+
+/*
+ * Create a virtual master control with the given name
+ */
+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 */
+        if (tlv) {
+                /* FIXME: this assumes that the max volume is 0 dB */
+                kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
+                kctl->tlv.p = tlv;
+        }
+        return kctl;
+}