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ASoC: Implement new DC servo readback mode for late WM8994 revisions

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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@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2011-08-01 13:02:17 +09:00
parent 25032c119e
commit 79ef0abcd8
3 changed files with 18 additions and 5 deletions
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1
include/linux/mfd/wm8994/registers.h
View file

@ -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

3
sound/soc/codecs/wm8994.c
View file

@ -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;
@ -2978,7 +2979,7 @@ 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;
}

19
sound/soc/codecs/wm_hubs.c
View file

@ -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);