ALSA: snd-usb-6fire: add tlv to controls

Remove the soft log-conversion and add a dB scale according to
the DAC documentation instead.

Signed-off-by: Torsten Schenk <torsten.schenk@zoho.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 9 insertions, 25 deletions

diff --git a/sound/usb/6fire/control.c b/sound/usb/6fire/control.c
index 8111844c4b16..b00b8bb88c63 100644
--- a/sound/usb/6fire/control.c
+++ b/sound/usb/6fire/control.c
@@ -15,6 +15,7 @@
 
 #include <linux/interrupt.h>
 #include <sound/control.h>
+#include <sound/tlv.h>
 
 #include "control.h"
 #include "comm.h"
@@ -24,26 +25,6 @@ static char *opt_coax_texts[2] = { "Optical", "Coax" };
 static char *line_phono_texts[2] = { "Line", "Phono" };
 
 /*
- * calculated with $value\[i\] = 128 \cdot sqrt[3]{\frac{i}{128}}$
- * this is done because the linear values cause rapid degredation
- * of volume in the uppermost region.
- */
-static const u8 log_volume_table[128] = {
-        0x00, 0x19, 0x20, 0x24, 0x28, 0x2b, 0x2e, 0x30, 0x32, 0x34,
-        0x36, 0x38, 0x3a, 0x3b, 0x3d, 0x3e, 0x40, 0x41, 0x42, 0x43,
-        0x44, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e,
-        0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x53, 0x54, 0x55, 0x56,
-        0x56, 0x57, 0x58, 0x58, 0x59, 0x5a, 0x5b, 0x5b, 0x5c, 0x5c,
-        0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x60, 0x61, 0x61, 0x62, 0x62,
-        0x63, 0x63, 0x64, 0x65, 0x65, 0x66, 0x66, 0x67, 0x67, 0x68,
-        0x68, 0x69, 0x69, 0x6a, 0x6a, 0x6b, 0x6b, 0x6c, 0x6c, 0x6c,
-        0x6d, 0x6d, 0x6e, 0x6e, 0x6f, 0x6f, 0x70, 0x70, 0x70, 0x71,
-        0x71, 0x72, 0x72, 0x73, 0x73, 0x73, 0x74, 0x74, 0x75, 0x75,
-        0x75, 0x76, 0x76, 0x77, 0x77, 0x77, 0x78, 0x78, 0x78, 0x79,
-        0x79, 0x7a, 0x7a, 0x7a, 0x7b, 0x7b, 0x7b, 0x7c, 0x7c, 0x7c,
-        0x7d, 0x7d, 0x7d, 0x7e, 0x7e, 0x7e, 0x7f, 0x7f };
-
-/*
  * data that needs to be sent to device. sets up card internal stuff.
  * values dumped from windows driver and filtered by trial'n'error.
  */
@@ -69,6 +50,8 @@ static const int rates_altsetting[] = { 1, 1, 2, 2, 3, 3 };
 static const u16 rates_6fire_vl[] = {0x00, 0x01, 0x00, 0x01, 0x00, 0x01};
 static const u16 rates_6fire_vh[] = {0x11, 0x11, 0x10, 0x10, 0x00, 0x00};
 
+static DECLARE_TLV_DB_MINMAX(tlv_output, -9000, 0);
+
 enum {
         DIGITAL_THRU_ONLY_SAMPLERATE = 3
 };
@@ -78,8 +61,7 @@ static void usb6fire_control_master_vol_update(struct control_runtime *rt)
         struct comm_runtime *comm_rt = rt->chip->comm;
         if (comm_rt) {
                 /* set volume */
-                comm_rt->write8(comm_rt, 0x12, 0x0f, 0x7f -
-                                log_volume_table[rt->master_vol]);
+                comm_rt->write8(comm_rt, 0x12, 0x0f, 180 - rt->master_vol);
                  /* unmute */
                 comm_rt->write8(comm_rt, 0x12, 0x0e, 0x00);
         }
@@ -170,7 +152,7 @@ static int usb6fire_control_master_vol_info(struct snd_kcontrol *kcontrol,
         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
         uinfo->count = 1;
         uinfo->value.integer.min = 0;
-        uinfo->value.integer.max = 127;
+        uinfo->value.integer.max = 180;
         return 0;
 }
 
@@ -291,10 +273,12 @@ static struct __devinitdata snd_kcontrol_new elements[] = {
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                 .name = "Master Playback Volume",
                 .index = 0,
-                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+                        SNDRV_CTL_ELEM_ACCESS_TLV_READ,
                 .info = usb6fire_control_master_vol_info,
                 .get = usb6fire_control_master_vol_get,
-                .put = usb6fire_control_master_vol_put
+                .put = usb6fire_control_master_vol_put,
+                .tlv = { .p = tlv_output }
         },
         {
                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,