I suspect this will find a better home in drivers/iio that subsystem did not exist when driver was originally written. It would need converted to new API. Graeme On 27/06/13 11:43, Oleksandr Kozaruk wrote: > Hello > > TWL603[02] GPADC is used to measure battery voltage, > battery temperature, battery presence ID, and could > be used to measure twl603[02] die temperature. > This is used on TI blaze, blaze tablet platforms. > > The TWL6030 and TWL6032 have GPADC with 17 and 19 > channels respectively. Some channels have current > source and are used for measuring voltage drop > on resistive load for detecting battery ID resistance, > or measuring voltage drop on NTC resistors for external > temperature measurements. Some channels measure voltage, > (i.e. battery voltage), and have inbuilt voltage dividers, > thus, capable to scale voltage. Some channels are dedicated > for measuring die temperature. > > Some channels could be calibrated in 2 points, having > offsets from ideal values in trim registers. > > The difference between GPADC in TWL6030 and TWL6032: > - 10 bit vs 12 bit ADC; > - 17 vs 19 channels; > - channels have different purpose(i. e. battery voltage > channel 8 vs channel 18); > - trim values are interpreted differently. > > The driver exports function returning converted value for > requested channels: raw code, corrected code, and converted > to mV result. > > Sysfs entries are added to start and read conversion result > in millivolts for channel if it has calibration data, or > ADC code(for temperature and test network channels). > > The driver is derived from git://git.omapzoom.org/kernel/omap.git > The original driver's authors and contributors are Balaji T K, > Graeme Gregory, Ambresh K, Girish S Ghongdemath. > > The changes to the original driver: > - device tree adaptation; > - drop ioctl support - never been used; > - unified measurement method for both devices; > - get rid of "if (device == X)" code style to data driven; > - drop polling end of conversion and use interrupt instead; > - simplified (hopefully) exported external function interface to the driver. > > Tested with on blaze tablet 2 with OMAP4430(twl6030), and > OMAP4470(twl6032) SOMs. > > The patches were tested against 3.10-rc7 > > Oleksandr Kozaruk (2): > ARM: dts: twl: Add GPADC data to device tree > mfd: twl6030-gpadc: TWL6030, TWL6032 GPADC driver > > .../testing/sysfs-devices-platform-twl6030_gpadc | 5 + > arch/arm/boot/dts/twl6030.dtsi | 5 + > drivers/mfd/Kconfig | 8 + > drivers/mfd/Makefile | 1 + > drivers/mfd/twl6030-gpadc.c | 1053 ++++++++++++++++++++ > include/linux/i2c/twl6030-gpadc.h | 51 + > 6 files changed, 1123 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-devices-platform-twl6030_gpadc > create mode 100644 drivers/mfd/twl6030-gpadc.c > create mode 100644 include/linux/i2c/twl6030-gpadc.h > -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
