diff options
| author |   Quentin Schulz <quentin.schulz@free-electrons.com> | 2016-12-13 15:33:32 +0100 |
|---|---|---|
| committer |   Jonathan Cameron <jic23@kernel.org> | 2017-03-08 20:27:25 +0000 |
| commit | d1caa99055382c91b57244343020ea37c4fa4d09 (patch) | |
| tree | 1a6fb4b789e201c0bb1368e29076121c2682ec49 /include/linux/mfd | |
| parent | MAINTAINERS: drop broken reference to i2c/trivial-devices (diff) | |
| download | linux-dev-d1caa99055382c91b57244343020ea37c4fa4d09.tar.xz linux-dev-d1caa99055382c91b57244343020ea37c4fa4d09.zip | |
iio: adc: add support for Allwinner SoCs ADC
The Allwinner SoCs all have an ADC that can also act as a touchscreen
controller and a thermal sensor. This patch adds the ADC driver which is
based on the MFD for the same SoCs ADC.
This also registers the thermal adc channel in the iio map array so
iio_hwmon could use it without modifying the Device Tree. This registers
the driver in the thermal framework.
The thermal sensor requires the IP to be in touchscreen mode to return
correct values. Therefore, if the user is continuously reading the ADC
channel(s), the thermal framework in which the thermal sensor is
registered will switch the IP in touchscreen mode to get a temperature
value and requires a delay of 100ms (because of the mode switching),
then the ADC will switch back to ADC mode and requires also a delay of
100ms. If the ADC readings are critical to user and the SoC temperature
is not, this driver is capable of not registering the thermal sensor in
the thermal framework and thus, "quicken" the ADC readings.
This driver probes on three different platform_device_id to take into
account slight differences (registers bit and temperature computation)
between Allwinner SoCs ADCs.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'include/linux/mfd')
| -rw-r--r-- | include/linux/mfd/sun4i-gpadc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mfd/sun4i-gpadc.h b/include/linux/mfd/sun4i-gpadc.h index d7a29f246d64..509e736d27fb 100644 --- a/include/linux/mfd/sun4i-gpadc.h +++ b/include/linux/mfd/sun4i-gpadc.h @@ -28,6 +28,7 @@ #define SUN4I_GPADC_CTRL1_TP_MODE_EN BIT(4) #define SUN4I_GPADC_CTRL1_TP_ADC_SELECT BIT(3) #define SUN4I_GPADC_CTRL1_ADC_CHAN_SELECT(x) (GENMASK(2, 0) & (x)) +#define SUN4I_GPADC_CTRL1_ADC_CHAN_MASK GENMASK(2, 0) /* TP_CTRL1 bits for sun6i SOCs */ #define SUN6I_GPADC_CTRL1_TOUCH_PAN_CALI_EN BIT(7) @@ -35,6 +36,7 @@ #define SUN6I_GPADC_CTRL1_TP_MODE_EN BIT(5) #define SUN6I_GPADC_CTRL1_TP_ADC_SELECT BIT(4) #define SUN6I_GPADC_CTRL1_ADC_CHAN_SELECT(x) (GENMASK(3, 0) & BIT(x)) +#define SUN6I_GPADC_CTRL1_ADC_CHAN_MASK GENMASK(3, 0) #define SUN4I_GPADC_CTRL2 0x08 |