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iio: sx9324: Add Setting for internal analog gain 

Based on device tree setting, set the internal analog gain.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220429220144.1476049-9-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Gwendal Grignou 2022-04-29 15:01:42 -07:00 committed by Jonathan Cameron
parent 67ac843324
commit 71783b07aa
1 changed files with 22 additions and 0 deletions
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22
drivers/iio/proximity/sx9324.c
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@ -79,6 +79,7 @@
#define SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM 0x02
#define SX9324_REG_AFE_CTRL8_RESFILTIN_MASK GENMASK(3, 0)
#define SX9324_REG_AFE_CTRL9 0x2d
#define SX9324_REG_AFE_CTRL9_AGAIN_MASK GENMASK(3, 0)
#define SX9324_REG_AFE_CTRL9_AGAIN_1 0x08
#define SX9324_REG_PROX_CTRL0 0x30
@ -941,6 +942,27 @@ sx9324_get_default_reg(struct device *dev, int idx,
raw / 2000);
break;
case SX9324_REG_AFE_CTRL9:
ret = device_property_read_u32(dev,
"semtech,input-analog-gain", &raw);
if (ret)
break;
/*
* The analog gain has the following setting:
* +---------+----------------+----------------+
* | dt(raw) | physical value | register value |
* +---------+----------------+----------------+
* | 0 | x1.247 | 6 |
* | 1 | x1 | 8 |
* | 2 | x0.768 | 11 |
* | 3 | x0.552 | 15 |
* +---------+----------------+----------------+
*/
reg_def->def &= ~SX9324_REG_AFE_CTRL9_AGAIN_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL9_AGAIN_MASK,
6 + raw * (raw + 3) / 2);
break;
case SX9324_REG_ADV_CTRL5:
ret = device_property_read_u32(dev, "semtech,startup-sensor",
&start);