[ALSA] echoaudio, add TLV support

This patch adds TLV support to the echoaudio driver.
All gains are in the range -127dB to +6dB with steps of 1dB, and -128 is
mute. VU-meters levels go from -128 to 0dB. The input gain of the Layla20
ranges from -25dB to +25dB in steps of 0.5dB.

Signed-off-by: Giuliano Pochini <pochini@shiny.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 17 insertions, 1 deletions

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 047e0b5bf15d..3410bd4450ad 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -34,6 +34,7 @@ module_param_array(enable, bool, NULL, 0444);
 MODULE_PARM_DESC(enable, "Enable " ECHOCARD_NAME " soundcard.");
 
 static unsigned int channels_list[10] = {1, 2, 4, 6, 8, 10, 12, 14, 16, 999999};
+static DECLARE_TLV_DB_SCALE(db_scale_output_gain, -12800, 100, 1);
 
 static int get_firmware(const struct firmware **fw_entry,
                         const struct firmware *frm, struct echoaudio *chip)
@@ -1011,17 +1012,21 @@ static int snd_echo_output_gain_put(struct snd_kcontrol *kcontrol,
 static struct snd_kcontrol_new snd_echo_line_output_gain __devinitdata = {
         .name = "Line Playback Volume",
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
         .info = snd_echo_output_gain_info,
         .get = snd_echo_output_gain_get,
         .put = snd_echo_output_gain_put,
+        .tlv = {.p = db_scale_output_gain},
 };
 #else
 static struct snd_kcontrol_new snd_echo_pcm_output_gain __devinitdata = {
         .name = "PCM Playback Volume",
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
         .info = snd_echo_output_gain_info,
         .get = snd_echo_output_gain_get,
         .put = snd_echo_output_gain_put,
+        .tlv = {.p = db_scale_output_gain},
 };
 #endif
 
@@ -1080,12 +1085,16 @@ static int snd_echo_input_gain_put(struct snd_kcontrol *kcontrol,
         return changed;
 }
 
+static DECLARE_TLV_DB_SCALE(db_scale_input_gain, -2500, 50, 0);
+
 static struct snd_kcontrol_new snd_echo_line_input_gain __devinitdata = {
         .name = "Line Capture Volume",
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
         .info = snd_echo_input_gain_info,
         .get = snd_echo_input_gain_get,
         .put = snd_echo_input_gain_put,
+        .tlv = {.p = db_scale_input_gain},
 };
 
 #endif /* ECHOCARD_HAS_INPUT_GAIN */
@@ -1277,9 +1286,11 @@ static int snd_echo_mixer_put(struct snd_kcontrol *kcontrol,
 static struct snd_kcontrol_new snd_echo_monitor_mixer __devinitdata = {
         .name = "Monitor Mixer Volume",
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
         .info = snd_echo_mixer_info,
         .get = snd_echo_mixer_get,
         .put = snd_echo_mixer_put,
+        .tlv = {.p = db_scale_output_gain},
 };
 
 #endif /* ECHOCARD_HAS_MONITOR */
@@ -1343,9 +1354,11 @@ static int snd_echo_vmixer_put(struct snd_kcontrol *kcontrol,
 static struct snd_kcontrol_new snd_echo_vmixer __devinitdata = {
         .name = "VMixer Volume",
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
         .info = snd_echo_vmixer_info,
         .get = snd_echo_vmixer_get,
         .put = snd_echo_vmixer_put,
+        .tlv = {.p = db_scale_output_gain},
 };
 
 #endif /* ECHOCARD_HAS_VMIXER */
@@ -1753,9 +1766,12 @@ static int snd_echo_vumeters_get(struct snd_kcontrol *kcontrol,
 static struct snd_kcontrol_new snd_echo_vumeters __devinitdata = {
         .name = "VU-meters",
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-        .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+        .access = SNDRV_CTL_ELEM_ACCESS_READ |
+                  SNDRV_CTL_ELEM_ACCESS_VOLATILE |
+                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
         .info = snd_echo_vumeters_info,
         .get = snd_echo_vumeters_get,
+        .tlv = {.p = db_scale_output_gain},
 };