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authorMauro Carvalho Chehab2011-06-19 13:06:40 -0300
committerMauro Carvalho Chehab2011-07-27 17:53:03 -0300
commit850d24a5a861238f583f59cd39de4dfe5142a4c9 (patch)
treee59192ee359e36dcb42b26a79ba00e804f8ba4a9
parent5b89ecf98998911f397fa913b06ee2304a373e54 (diff)
[media] em28xx-alsa: add mixer support for AC97 volume controls
Export ac97 volume controls via mixer. Pulseaudio will probably handle it very badly, as it has no idea about how volumes are wired, and how are they associated with each TV input. Those wirings are card model dependent, and we don't have the wiring mappings for each supported device. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/video/em28xx/em28xx-audio.c103
-rw-r--r--drivers/media/video/em28xx/em28xx-core.c2
2 files changed, 105 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index a24e1770db48..a75c779640df 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -41,6 +41,7 @@
#include <sound/info.h>
#include <sound/initval.h>
#include <sound/control.h>
+#include <sound/tlv.h>
#include <media/v4l2-common.h>
#include "em28xx.h"
@@ -433,6 +434,92 @@ static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
return vmalloc_to_page(pageptr);
}
+/*
+ * AC97 volume control support
+ */
+static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *info)
+{
+ info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ info->count = 2;
+ info->value.integer.min = 0;
+ info->value.integer.max = 0x1f;
+
+ return 0;
+}
+
+/* FIXME: should also add mute controls for each */
+
+static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *value)
+{
+ struct em28xx *dev = snd_kcontrol_chip(kcontrol);
+ u16 val = (value->value.integer.value[0] & 0x1f) |
+ (value->value.integer.value[1] & 0x1f) << 8;
+ int rc;
+
+ mutex_lock(&dev->lock);
+ rc = em28xx_read_ac97(dev, kcontrol->private_value);
+ if (rc < 0)
+ goto err;
+
+ val |= rc & 0x8080; /* Preserve the mute flags */
+
+ rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
+
+err:
+ mutex_unlock(&dev->lock);
+ return rc;
+}
+
+static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *value)
+{
+ struct em28xx *dev = snd_kcontrol_chip(kcontrol);
+ int val;
+
+ mutex_lock(&dev->lock);
+ val = em28xx_read_ac97(dev, kcontrol->private_value);
+ mutex_unlock(&dev->lock);
+ if (val < 0)
+ return val;
+
+ value->value.integer.value[0] = val & 0x1f;
+ value->value.integer.value[1] = (val << 8) & 0x1f;
+
+ return 0;
+}
+
+static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
+
+static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
+ char *name, int id)
+{
+ int err;
+ struct snd_kcontrol *kctl;
+ struct snd_kcontrol_new tmp = {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = name,
+ .info = em28xx_vol_info,
+ .get = em28xx_vol_get,
+ .put = em28xx_vol_put,
+ .private_value = id,
+ .tlv.p = em28xx_db_scale,
+ };
+
+ kctl = snd_ctl_new1(&tmp, dev);
+
+ err = snd_ctl_add(card, kctl);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+
+/*
+ * register/unregister code and data
+ */
static struct snd_pcm_ops snd_em28xx_pcm_capture = {
.open = snd_em28xx_capture_open,
.close = snd_em28xx_pcm_close,
@@ -489,6 +576,22 @@ static int em28xx_audio_init(struct em28xx *dev)
INIT_WORK(&dev->wq_trigger, audio_trigger);
+ if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
+ em28xx_cvol_new(card, dev, "Video", AC97_VIDEO_VOL);
+ em28xx_cvol_new(card, dev, "Line In", AC97_LINEIN_VOL);
+ em28xx_cvol_new(card, dev, "Phone", AC97_PHONE_VOL);
+ em28xx_cvol_new(card, dev, "Microphone", AC97_PHONE_VOL);
+ em28xx_cvol_new(card, dev, "CD", AC97_CD_VOL);
+ em28xx_cvol_new(card, dev, "AUX", AC97_AUX_VOL);
+ em28xx_cvol_new(card, dev, "PCM", AC97_PCM_OUT_VOL);
+
+ em28xx_cvol_new(card, dev, "Master", AC97_MASTER_VOL);
+ em28xx_cvol_new(card, dev, "Line", AC97_LINE_LEVEL_VOL);
+ em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO_VOL);
+ em28xx_cvol_new(card, dev, "LFE", AC97_LFE_MASTER_VOL);
+ em28xx_cvol_new(card, dev, "Surround", AC97_SURR_MASTER_VOL);
+ }
+
err = snd_card_register(card);
if (err < 0) {
snd_card_free(card);
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c
index 7bf3a86902b0..752d4ed7f828 100644
--- a/drivers/media/video/em28xx/em28xx-core.c
+++ b/drivers/media/video/em28xx/em28xx-core.c
@@ -286,6 +286,7 @@ int em28xx_read_ac97(struct em28xx *dev, u8 reg)
return ret;
return le16_to_cpu(val);
}
+EXPORT_SYMBOL_GPL(em28xx_read_ac97);
/*
* em28xx_write_ac97()
@@ -313,6 +314,7 @@ int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
return 0;
}
+EXPORT_SYMBOL_GPL(em28xx_write_ac97);
struct em28xx_vol_itable {
enum em28xx_amux mux;