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esp8089

ESP8089 Linux driver

v1.9 imported from the Rockchip Linux kernel github repo

Modified to build as a standalone module for SDIO devices.

Building:

make
sudo make install

Using:

modprobe should autoload the module as the ESP8089 should be detected by the SDIO driver and loaded as a dependency.

The ESP8089 requires that the CH_PD signal be reset before the driver can load properly, so a GPIO is used by the driver to assert this signal for 200ms. The GPIO defaults to 0 (ID_SD on the Raspberry Pi) but this can be changed to any GPIO mapped by the kernel GPIO driver through the esp_reset_gpio module parameter. This can be accomplished by creating a new modprobe.d config file. For example, to use GPIO 5 instead, create as root /etc/modprobe.d/esp.conf and add the line:

options esp8089 esp_reset_gpio=5

which changes the GPIO from 0 to 5.

Building a Debian source package:

To build a source package for release, first install the following:

apt-get install debhelper dkms raspberrypi-kernel-headers

Then build the package:

sudo make dkmsdeb

The module will be named esp8089-dkms_*.deb. Don't forget to update the version in dkms.conf and committing before making a release!

If the build fails to create a source package, try installing dkms from github:

sudo apt-get remove dkms
sudo apt-get install devscripts quilt
git clone https://github.com/dell/dkms.git
cd dkms
sed -ie "s/module-init-tools/kmod/g" debian/control
make debs

and install the resulting package in dist/