Hi, On Tue, Jun 28, 2016 at 4:45 PM, Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx> wrote: > The Allwinner SoCs all have an ADC that can also act as a touchscreen controller > and a thermal sensor. The first four channels can be used either for the ADC or > the touchscreen and the fifth channel is used for the thermal sensor. We > currently have a driver for the two latter functions in > drivers/input/touchscreen/sun4i-ts.c but we don't have access to the ADC feature > at all. > > This adds initial support for Allwinner SoCs ADC with all features. Yet, the > touchscreen is not implemented but will be added later. To switch between > touchscreen and ADC modes, you need to poke few bits in registers and > (de)activate an interrupt (pen-up). > A MFD is provided to let the input driver activate the pen-up interrupt through > virtual interrupt, poke few bits via regmap and read data from the ADC driver > while both (and iio_hwmon) are probed by the MFD. I take it that we are going to replace the original sun4i-ts driver with this new mfd one, and various sub device drivers? > There exists slight modifications between the different SoCs ADC like the > address of some registers and the scale and offset to apply to thermal sensor > raw values. These modifications are done by drivers on different > platform_device_id passed by the MFD when probing subdrivers. > > This also modifies iio-hwmon to allow probe deferring when no iio channel is > found. Currently when no iio channel is found, the probing of iio-hwmon fails. > This is problematic when iio-hwmon probes before the iio driver could register > iio channels to share. One thing about iio-hwmon is that it doesn't support hwmon labels. Any chance you could improve this, so we see the same names in userspace? Thanks ChenYu > > Quentin Schulz (3): > mfd: add support for Allwinner SoCs ADC > iio: adc: add support for Allwinner SoCs ADC > hwmon: iio_hwmon: defer probe when no channel is found > > drivers/hwmon/iio_hwmon.c | 5 +- > drivers/iio/adc/Kconfig | 12 ++ > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/sunxi-gpadc-iio.c | 371 ++++++++++++++++++++++++++++++++++++ > drivers/mfd/Kconfig | 14 ++ > drivers/mfd/Makefile | 2 + > drivers/mfd/sunxi-gpadc-mfd.c | 188 ++++++++++++++++++ > include/linux/mfd/sunxi-gpadc-mfd.h | 14 ++ > 8 files changed, 606 insertions(+), 1 deletion(-) > create mode 100644 drivers/iio/adc/sunxi-gpadc-iio.c > create mode 100644 drivers/mfd/sunxi-gpadc-mfd.c > create mode 100644 include/linux/mfd/sunxi-gpadc-mfd.h > > -- > 2.5.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
