[alsa-devel] [PATCH 1/2] ASoC: Implement new DC servo readback mode for late WM8994 revisions

[Liam Girdwood]

On 01/08/11 06:12, Mark Brown wrote:
> Later WM8994 devices implement a new DC servo readback mode with the
> register used to access the offset moved to register 0x59. Implement
> support for this and enable it on the appropriate devices.
> 
> Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>

both 

Acked-by: Liam Girdwood <lrg at ti.com>
 
> ---
>  include/linux/mfd/wm8994/registers.h |    1 +
>  sound/soc/codecs/wm8994.c            |    3 ++-
>  sound/soc/codecs/wm_hubs.c           |   19 +++++++++++++++----
>  3 files changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/mfd/wm8994/registers.h b/include/linux/mfd/wm8994/registers.h
> index f3ee842..6152914 100644
> --- a/include/linux/mfd/wm8994/registers.h
> +++ b/include/linux/mfd/wm8994/registers.h
> @@ -72,6 +72,7 @@
>  #define WM8994_DC_SERVO_2                       0x55
>  #define WM8994_DC_SERVO_4                       0x57
>  #define WM8994_DC_SERVO_READBACK                0x58
> +#define WM8994_DC_SERVO_4E			0x59
>  #define WM8994_ANALOGUE_HP_1                    0x60
>  #define WM8958_MIC_DETECT_1                     0xD0
>  #define WM8958_MIC_DETECT_2                     0xD1
> diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
> index cc8222c..e1e9aca 100644
> --- a/sound/soc/codecs/wm8994.c
> +++ b/sound/soc/codecs/wm8994.c
> @@ -107,6 +107,7 @@ static int wm8994_volatile(struct snd_soc_codec *codec, unsigned int reg)
>  	case WM8994_LDO_2:
>  	case WM8958_DSP2_EXECCONTROL:
>  	case WM8958_MIC_DETECT_3:
> +	case WM8994_DC_SERVO_4E:
>  		return 1;
>  	default:
>  		return 0;
> @@ -2965,7 +2966,7 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
>  			wm8994->hubs.series_startup = 1;
>  			break;
>  		default:
> -			wm8994->hubs.dcs_readback_mode = 1;
> +			wm8994->hubs.dcs_readback_mode = 2;
>  			break;
>  		}
>  
> diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
> index 4416a76..524bdc6 100644
> --- a/sound/soc/codecs/wm_hubs.c
> +++ b/sound/soc/codecs/wm_hubs.c
> @@ -18,6 +18,7 @@
>  #include <linux/pm.h>
>  #include <linux/i2c.h>
>  #include <linux/platform_device.h>
> +#include <linux/mfd/wm8994/registers.h>
>  #include <sound/core.h>
>  #include <sound/pcm.h>
>  #include <sound/pcm_params.h>
> @@ -116,14 +117,23 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
>  {
>  	struct wm_hubs_data *hubs = snd_soc_codec_get_drvdata(codec);
>  	s8 offset;
> -	u16 reg, reg_l, reg_r, dcs_cfg;
> +	u16 reg, reg_l, reg_r, dcs_cfg, dcs_reg;
> +
> +	switch (hubs->dcs_readback_mode) {
> +	case 2:
> +		dcs_reg = WM8994_DC_SERVO_4E;
> +		break;
> +	default:
> +		dcs_reg = WM8993_DC_SERVO_3;
> +		break;
> +	}
>  
>  	/* If we're using a digital only path and have a previously
>  	 * callibrated DC servo offset stored then use that. */
>  	if (hubs->class_w && hubs->class_w_dcs) {
>  		dev_dbg(codec->dev, "Using cached DC servo offset %x\n",
>  			hubs->class_w_dcs);
> -		snd_soc_write(codec, WM8993_DC_SERVO_3, hubs->class_w_dcs);
> +		snd_soc_write(codec, dcs_reg, hubs->class_w_dcs);
>  		wait_for_dc_servo(codec,
>  				  WM8993_DCS_TRIG_DAC_WR_0 |
>  				  WM8993_DCS_TRIG_DAC_WR_1);
> @@ -154,8 +164,9 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
>  		reg_r = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_2)
>  			& WM8993_DCS_INTEG_CHAN_1_MASK;
>  		break;
> +	case 2:
>  	case 1:
> -		reg = snd_soc_read(codec, WM8993_DC_SERVO_3);
> +		reg = snd_soc_read(codec, dcs_reg);
>  		reg_r = (reg & WM8993_DCS_DAC_WR_VAL_1_MASK)
>  			>> WM8993_DCS_DAC_WR_VAL_1_SHIFT;
>  		reg_l = reg & WM8993_DCS_DAC_WR_VAL_0_MASK;
> @@ -185,7 +196,7 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
>  		dev_dbg(codec->dev, "DCS result: %x\n", dcs_cfg);
>  
>  		/* Do it */
> -		snd_soc_write(codec, WM8993_DC_SERVO_3, dcs_cfg);
> +		snd_soc_write(codec, dcs_reg, dcs_cfg);
>  		wait_for_dc_servo(codec,
>  				  WM8993_DCS_TRIG_DAC_WR_0 |
>  				  WM8993_DCS_TRIG_DAC_WR_1);