[alsa-devel] [PATCH 1/2] ASoC: wm8960: correct the min gain value of some PGA
The min gain is the corresponding gain value when the register value is 0 instead of 1, just correct it.
Signed-off-by: Zidan Wang zidan.wang@freescale.com --- sound/soc/codecs/wm8960.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index e3b7d0c..6163474 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -211,11 +211,11 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, return wm8960_set_deemph(codec); }
-static const DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 50, 0); -static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 50, 1); +static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1); static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1200, 300, 1); +static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL,
The input PGAs have a gain range from -17.25dB to +30dB in 0.75dB steps.
The boost stage can provide additional gain. For line inputs, -12dB to +6dB gain is available on the boost mixer. For micphone inputs, it can provide up to +29dB additional gain from the microphone PGA.
Signed-off-by: Zidan Wang zidan.wang@freescale.com --- sound/soc/codecs/wm8960.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index 6163474..6975390 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -212,27 +212,37 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, }
static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1725, 75, 0); static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1); static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1); +static const DECLARE_TLV_DB_SCALE(lineinboost_tlv, -1500, 300, 1); +static const unsigned int micboost_tlv[] = { + TLV_DB_RANGE_HEAD(2), + 0, 1, TLV_DB_SCALE_ITEM(0, 1300, 0), + 2, 3, TLV_DB_SCALE_ITEM(2000, 900, 0), +};
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL, - 0, 63, 0, adc_tlv), + 0, 63, 0, inpga_tlv), SOC_DOUBLE_R("Capture Volume ZC Switch", WM8960_LINVOL, WM8960_RINVOL, 6, 1, 0), SOC_DOUBLE_R("Capture Switch", WM8960_LINVOL, WM8960_RINVOL, 7, 1, 0),
SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT3 Volume", - WM8960_INBMIX1, 4, 7, 0, boost_tlv), + WM8960_INBMIX1, 4, 7, 0, lineinboost_tlv), SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT2 Volume", - WM8960_INBMIX1, 1, 7, 0, boost_tlv), + WM8960_INBMIX1, 1, 7, 0, lineinboost_tlv), SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT3 Volume", - WM8960_INBMIX2, 4, 7, 0, boost_tlv), + WM8960_INBMIX2, 4, 7, 0, lineinboost_tlv), SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT2 Volume", - WM8960_INBMIX2, 1, 7, 0, boost_tlv), + WM8960_INBMIX2, 1, 7, 0, lineinboost_tlv), +SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT1 Volume", + WM8960_RINPATH, 4, 4, 0, micboost_tlv), +SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT1 Volume", + WM8960_LINPATH, 4, 4, 0, micboost_tlv),
SOC_DOUBLE_R_TLV("Playback Volume", WM8960_LDAC, WM8960_RDAC, 0, 255, 0, dac_tlv),
On Wed, Sep 09, 2015 at 07:29:11PM +0800, Zidan Wang wrote:
The input PGAs have a gain range from -17.25dB to +30dB in 0.75dB steps.
The boost stage can provide additional gain. For line inputs, -12dB to +6dB gain is available on the boost mixer. For micphone inputs, it can provide up to +29dB additional gain from the microphone PGA.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
sound/soc/codecs/wm8960.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index 6163474..6975390 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -212,27 +212,37 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, }
static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1725, 75, 0); static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1); static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1); +static const DECLARE_TLV_DB_SCALE(lineinboost_tlv, -1500, 300, 1); +static const unsigned int micboost_tlv[] = {
- TLV_DB_RANGE_HEAD(2),
- 0, 1, TLV_DB_SCALE_ITEM(0, 1300, 0),
- 2, 3, TLV_DB_SCALE_ITEM(2000, 900, 0),
+};
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL,
0, 63, 0, adc_tlv),
0, 63, 0, inpga_tlv),
This would make adc_tlv unused so you should probably remove it.
Although looking at this, it does looks a bit to me like the registers are just specified wrong here and this was intended to be the ADC volumes rather than the PGA volumes. In which case the current TLV would be correct, the registers should be correct and a new control should be added if you need to use the PGA volume.
Thanks, Charles
SOC_DOUBLE_R("Capture Volume ZC Switch", WM8960_LINVOL, WM8960_RINVOL, 6, 1, 0), SOC_DOUBLE_R("Capture Switch", WM8960_LINVOL, WM8960_RINVOL, 7, 1, 0),
SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT3 Volume",
WM8960_INBMIX1, 4, 7, 0, boost_tlv),
WM8960_INBMIX1, 4, 7, 0, lineinboost_tlv),SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT2 Volume",
WM8960_INBMIX1, 1, 7, 0, boost_tlv),
WM8960_INBMIX1, 1, 7, 0, lineinboost_tlv),SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT3 Volume",
WM8960_INBMIX2, 4, 7, 0, boost_tlv),
WM8960_INBMIX2, 4, 7, 0, lineinboost_tlv),SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT2 Volume",
WM8960_INBMIX2, 1, 7, 0, boost_tlv),
WM8960_INBMIX2, 1, 7, 0, lineinboost_tlv),+SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT1 Volume",
WM8960_RINPATH, 4, 4, 0, micboost_tlv),+SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT1 Volume",
WM8960_LINPATH, 4, 4, 0, micboost_tlv),SOC_DOUBLE_R_TLV("Playback Volume", WM8960_LDAC, WM8960_RDAC, 0, 255, 0, dac_tlv), -- 1.9.1
On Wed, Sep 09, 2015 at 01:02:06PM +0100, Charles Keepax wrote:
On Wed, Sep 09, 2015 at 07:29:11PM +0800, Zidan Wang wrote:
The input PGAs have a gain range from -17.25dB to +30dB in 0.75dB steps.
The boost stage can provide additional gain. For line inputs, -12dB to +6dB gain is available on the boost mixer. For micphone inputs, it can provide up to +29dB additional gain from the microphone PGA.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
sound/soc/codecs/wm8960.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index 6163474..6975390 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -212,27 +212,37 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, }
static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1725, 75, 0); static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1); static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1); +static const DECLARE_TLV_DB_SCALE(lineinboost_tlv, -1500, 300, 1); +static const unsigned int micboost_tlv[] = {
- TLV_DB_RANGE_HEAD(2),
- 0, 1, TLV_DB_SCALE_ITEM(0, 1300, 0),
- 2, 3, TLV_DB_SCALE_ITEM(2000, 900, 0),
+};
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL,
0, 63, 0, adc_tlv),
0, 63, 0, inpga_tlv),This would make adc_tlv unused so you should probably remove it.
Although looking at this, it does looks a bit to me like the registers are just specified wrong here and this was intended to be the ADC volumes rather than the PGA volumes. In which case the current TLV would be correct, the registers should be correct and a new control should be added if you need to use the PGA volume.
Thanks, Charles
adc_tlv is used for "ADC PCM Capture Volume", so i can't remove it. SOC_DOUBLE_R_TLV("ADC PCM Capture Volume", WM8960_LADC, WM8960_RADC, 0, 255, 0, adc_tlv),
Best Regards, Zidan Wang
SOC_DOUBLE_R("Capture Volume ZC Switch", WM8960_LINVOL, WM8960_RINVOL, 6, 1, 0), SOC_DOUBLE_R("Capture Switch", WM8960_LINVOL, WM8960_RINVOL, 7, 1, 0),
SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT3 Volume",
WM8960_INBMIX1, 4, 7, 0, boost_tlv),
WM8960_INBMIX1, 4, 7, 0, lineinboost_tlv),SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT2 Volume",
WM8960_INBMIX1, 1, 7, 0, boost_tlv),
WM8960_INBMIX1, 1, 7, 0, lineinboost_tlv),SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT3 Volume",
WM8960_INBMIX2, 4, 7, 0, boost_tlv),
WM8960_INBMIX2, 4, 7, 0, lineinboost_tlv),SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT2 Volume",
WM8960_INBMIX2, 1, 7, 0, boost_tlv),
WM8960_INBMIX2, 1, 7, 0, lineinboost_tlv),+SOC_SINGLE_TLV("Right Input Boost Mixer RINPUT1 Volume",
WM8960_RINPATH, 4, 4, 0, micboost_tlv),+SOC_SINGLE_TLV("Left Input Boost Mixer LINPUT1 Volume",
WM8960_LINPATH, 4, 4, 0, micboost_tlv),SOC_DOUBLE_R_TLV("Playback Volume", WM8960_LDAC, WM8960_RDAC, 0, 255, 0, dac_tlv), -- 1.9.1
On Thu, Sep 10, 2015 at 09:20:26AM +0800, Zidan Wang wrote:
On Wed, Sep 09, 2015 at 01:02:06PM +0100, Charles Keepax wrote:
On Wed, Sep 09, 2015 at 07:29:11PM +0800, Zidan Wang wrote:
The input PGAs have a gain range from -17.25dB to +30dB in 0.75dB steps.
The boost stage can provide additional gain. For line inputs, -12dB to +6dB gain is available on the boost mixer. For micphone inputs, it can provide up to +29dB additional gain from the microphone PGA.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
sound/soc/codecs/wm8960.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index 6163474..6975390 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -212,27 +212,37 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, }
static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1725, 75, 0); static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1); static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1); +static const DECLARE_TLV_DB_SCALE(lineinboost_tlv, -1500, 300, 1); +static const unsigned int micboost_tlv[] = {
- TLV_DB_RANGE_HEAD(2),
- 0, 1, TLV_DB_SCALE_ITEM(0, 1300, 0),
- 2, 3, TLV_DB_SCALE_ITEM(2000, 900, 0),
+};
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL,
0, 63, 0, adc_tlv),
0, 63, 0, inpga_tlv),This would make adc_tlv unused so you should probably remove it.
Although looking at this, it does looks a bit to me like the registers are just specified wrong here and this was intended to be the ADC volumes rather than the PGA volumes. In which case the current TLV would be correct, the registers should be correct and a new control should be added if you need to use the PGA volume.
Thanks, Charles
adc_tlv is used for "ADC PCM Capture Volume", so i can't remove it. SOC_DOUBLE_R_TLV("ADC PCM Capture Volume", WM8960_LADC, WM8960_RADC, 0, 255, 0, adc_tlv),
Oops... some how I missed that control, this patch probably looks good then.
Thanks, Charles
On Wed, Sep 09, 2015 at 07:29:11PM +0800, Zidan Wang wrote:
The input PGAs have a gain range from -17.25dB to +30dB in 0.75dB steps.
The boost stage can provide additional gain. For line inputs, -12dB to +6dB gain is available on the boost mixer. For micphone inputs, it can provide up to +29dB additional gain from the microphone PGA.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
Acked-by: Charles Keepax ckeepax@opensource.wolfsonmicro.com
Thanks, Charles
On Wed, Sep 09, 2015 at 07:29:10PM +0800, Zidan Wang wrote:
The min gain is the corresponding gain value when the register value is 0 instead of 1, just correct it.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
sound/soc/codecs/wm8960.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index e3b7d0c..6163474 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -211,11 +211,11 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, return wm8960_set_deemph(codec); }
-static const DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 50, 0); -static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 50, 1); +static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
The value zero is used for digital mute here. So I don't think it is really appropriate to extend the TLV to show it as -97.5dB or -127.5dB.
static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1200, 300, 1); +static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
Same here.
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL, -- 1.9.1
Thanks, Charles
On Wed, Sep 09, 2015 at 12:49:54PM +0100, Charles Keepax wrote:
On Wed, Sep 09, 2015 at 07:29:10PM +0800, Zidan Wang wrote:
The min gain is the corresponding gain value when the register value is 0 instead of 1, just correct it.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
sound/soc/codecs/wm8960.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index e3b7d0c..6163474 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -211,11 +211,11 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, return wm8960_set_deemph(codec); }
-static const DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 50, 0); -static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 50, 1); +static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
The value zero is used for digital mute here. So I don't think it is really appropriate to extend the TLV to show it as -97.5dB or -127.5dB.
I think the min register value will corresponding to the min gain. So value 0 will also have a gain value, although it's for digital mute.
Refer to wm8962 codec driver, beep gain range is -90db~-6db, step in 6db, but it define the beep gain like below: static const DECLARE_TLV_DB_SCALE(beep_tlv, -9600, 600, 1);
Best Regards, Zidan Wang
static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); -static const DECLARE_TLV_DB_SCALE(boost_tlv, -1200, 300, 1); +static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
Same here.
static const struct snd_kcontrol_new wm8960_snd_controls[] = { SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL, -- 1.9.1
Thanks, Charles
On Thu, Sep 10, 2015 at 09:15:32AM +0800, Zidan Wang wrote:
On Wed, Sep 09, 2015 at 12:49:54PM +0100, Charles Keepax wrote:
On Wed, Sep 09, 2015 at 07:29:10PM +0800, Zidan Wang wrote:
The min gain is the corresponding gain value when the register value is 0 instead of 1, just correct it.
Signed-off-by: Zidan Wang zidan.wang@freescale.com
sound/soc/codecs/wm8960.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index e3b7d0c..6163474 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -211,11 +211,11 @@ static int wm8960_put_deemph(struct snd_kcontrol *kcontrol, return wm8960_set_deemph(codec); }
-static const DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 50, 0); -static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 50, 1); +static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
The value zero is used for digital mute here. So I don't think it is really appropriate to extend the TLV to show it as -97.5dB or -127.5dB.
I think the min register value will corresponding to the min gain. So value 0 will also have a gain value, although it's for digital mute.
Refer to wm8962 codec driver, beep gain range is -90db~-6db, step in 6db, but it define the beep gain like below: static const DECLARE_TLV_DB_SCALE(beep_tlv, -9600, 600, 1);
I might have to defer to Mark on this one then, if it is normal to just use an additional gain value for mute in this type of situation then it is ok with me. But it doesn't seem like that would be a sensible thing, as you are asking for -97.5dB but that is not what you are getting which doesn't seem like the nicest interface.
Thanks, Charles
On Thu, Sep 10, 2015 at 09:24:20AM +0100, Charles Keepax wrote:
On Thu, Sep 10, 2015 at 09:15:32AM +0800, Zidan Wang wrote:
+static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
I think the min register value will corresponding to the min gain. So value 0 will also have a gain value, although it's for digital mute.
Refer to wm8962 codec driver, beep gain range is -90db~-6db, step in 6db, but it define the beep gain like below: static const DECLARE_TLV_DB_SCALE(beep_tlv, -9600, 600, 1);
I might have to defer to Mark on this one then, if it is normal to just use an additional gain value for mute in this type of situation then it is ok with me. But it doesn't seem like that would be a sensible thing, as you are asking for -97.5dB but that is not what you are getting which doesn't seem like the nicest interface.
The last value in the scale macro is a flag saying if the minimum value is mute - if it's set to 1 userspace should know this is what's going on.
On Thu, Sep 10, 2015 at 11:58:21AM +0100, Mark Brown wrote:
On Thu, Sep 10, 2015 at 09:24:20AM +0100, Charles Keepax wrote:
On Thu, Sep 10, 2015 at 09:15:32AM +0800, Zidan Wang wrote:
+static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1); +static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
I think the min register value will corresponding to the min gain. So value 0 will also have a gain value, although it's for digital mute.
Refer to wm8962 codec driver, beep gain range is -90db~-6db, step in 6db, but it define the beep gain like below: static const DECLARE_TLV_DB_SCALE(beep_tlv, -9600, 600, 1);
I might have to defer to Mark on this one then, if it is normal to just use an additional gain value for mute in this type of situation then it is ok with me. But it doesn't seem like that would be a sensible thing, as you are asking for -97.5dB but that is not what you are getting which doesn't seem like the nicest interface.
The last value in the scale macro is a flag saying if the minimum value is mute - if it's set to 1 userspace should know this is what's going on.
Ah sorry my bad, thanks.
In that case:
Acked-by: Charles Keepax ckeepax@opensource.wolfsonmicro.com
Thanks, Charles
participants (3)
-
Charles Keepax -
Mark Brown -
Zidan Wang