This reduces the needed modifications to the mainline Linux kernel and
also makes the regmap package work with an out of tree kernel which
does not have these modifications.
The regmap-core is only added when it is really build as a module.
The regmap-core is normally bool so it cannot be built as a module in an
unmodified kernel. When it is selected by on other kernel module it will
always be selected as build in and it also does not show up in
$(LINUX_DIR)/modules.builtin as it is not supposed to be a kernel module.
When it is not in $(LINUX_DIR)/modules.builtin the build system expects
it to be built as a .ko file.
Just check if the module is really there and only add it in that case.
This splits the regmap package into multiple packages, one for each bus type.
This way only the bus maps which are really needed have to be added.
This also splits the I2C, SPI and MMIO regmap into separate packages to not
require all these subsystems to build them, on an unmodified upstream kernel
this also causes problems in some situations.
Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>
Add support for the Silicon Labs Si7020 family of relative humidity and
temperature sensors using the I2C bus.
Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
This adds support for the htu21 humidity and temperature sensor.
To get it to work you have to do something like this:
echo "htu21 0x40" >/sys/class/i2c-dev/i2c-1/device/new_device
for example by adding it to rc.local
Compile tested on brcm2708 and I have used an earlier version of this
patch for more than a year.
Signed-off-by: Torbjörn Jansson <torbjorn.jansson@mbox200.swipnet.se>
This driver supports the Bosch Sensortec BMP180/BMP280 pressure and
temperature sensors. It also supports the BME280 sensors with an
additional humidity channel.
Tested I2C and SPI modes with a BME280 sensor on a Raspberry Pi Zero W.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Stijn Tintel
Hauke Mehrtens
Roman Bazalevsky
Rosen Penev
Hartmut Knaack
Torbjörn Jansson
Zoltan HERPAI
Michael Heimpold
Hauke Mehrtens