summaryrefslogtreecommitdiff
path: root/drivers/iio
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2017-07-08 15:11:57 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2017-07-09 21:16:28 +0100
commit3091141d7803608950adc001518ffb544a4e3308 (patch)
tree96f6118bacbc5c0ac8a231004296d74ebf23747c /drivers/iio
parentd466d3c1217406b14b834335b5b4b33c0d45bd09 (diff)
iio: adc: axp288: Fix the GPADC pin reading often wrongly returning 0
I noticed in its DSDT that one of my tablets actually is using the GPADC pin for temperature monitoring. The whole axp288_adc_set_ts() function is a bit weird, in the past it was removed because it seems to make no sense, then this was reverted because of regressions. So I decided to test the special GPADC pin handling on this tablet. Conclusion: not only is axp288_adc_set_ts() necessary, we need to sleep a bit after making the AXP288_ADC_TS_PIN_CTRL changes before sampling the GPADC, otherwise it will often (about 80% of the time) read 0 instead of its actual value. It seems that there is only 1 bias current source and to be able to use it for the GPIO0 pin in GPADC mode it must be temporarily turned off for the TS pin, but the datasheet does not mention this. This commit adds a sleep after disabling the TS pin bias current, fixing the GPADC more often then not wrongly returning 0. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/axp288_adc.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c
index 7fd24949c0c1..462a99c13e7a 100644
--- a/drivers/iio/adc/axp288_adc.c
+++ b/drivers/iio/adc/axp288_adc.c
@@ -126,11 +126,21 @@ static int axp288_adc_read_channel(int *val, unsigned long address,
static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,
unsigned long address)
{
+ int ret;
+
/* channels other than GPADC do not need to switch TS pin */
if (address != AXP288_GP_ADC_H)
return 0;
- return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
+ ret = regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
+ if (ret)
+ return ret;
+
+ /* When switching to the GPADC pin give things some time to settle */
+ if (mode == AXP288_ADC_TS_PIN_GPADC)
+ usleep_range(6000, 10000);
+
+ return 0;
}
static int axp288_adc_read_raw(struct iio_dev *indio_dev,