[Buildroot] Fwd: Fwd: Fwd: Fwd: [PATCH v3] linux: add fbtft kernel extension

[Peter Seiderer]

Hello Lou,

On Mon, Jan 12, 2015 at 11:58:16PM -0600, Lou Crittenden wrote:
> As for the drivers starting up @ boot, I followed the advice of this page:
> http://unix.stackexchange.com/questions/59018/create-and-control-start-up-scripts-in-busybox
> (I have busybox enabled) and attempted to make a simple script in the
> /etc/init.d/ folder called fbtft, but no go.
> 
> here it is (and I did make sure to run chmod +x on it to make it
> executable):
> 
> #!/bin/sh
> 
> exec insmod /lib/modules/3.12.28/kernel/drivers/video/fbtft/fbtft_device.ko
> name=waveshare32b rotate=270
> 
> exec insmod /lib/modules/3.12.28/kernel/drivers/input/touchscreen/ads7846.ko
> 

The following script '/etc/init.d/S30fbtft' should work:
--- begin ----
#!/bin/sh
#
# Start waveshare32b (fbtft_device, ads7846_device)
#

case "$1" in
  start)
        echo -n "Starting waveshare32b: "
        modprobe fbtft_device name=waveshare32b rotate=270
        # from https://github.com/notro/fbtft/issues/181
        modprobe ads7846_device model=7846 cs=1 gpio_pendown=17 speed=1000000 keep_vref_on=1 swap_xy=0 pressure_max=255 x_plate_ohms=60 x_min=200 x_max=3900 y_min=200 y_max=3900
        # from http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=95231
        # modprobe ads7846_device model=7846 cs=1 gpio_pendown=17 speed=1000000 keep_vref_on=1 swap_xy=0
        echo "OK"
        ;;
  stop)
        echo -n "Stopping waveshare32b: "
        rmmod fbtft_device
        rmmod fb_ili9340
        rmmod ads7846_device
        rmmod ads7846
        echo "OK"
        ;;
  restart|reload)
        ;;
  *)
        echo "Usage: $0 {start|stop|restart}"
        exit 1
esac

exit $?
--- end ---

For testing use
$ /etc/init.d/S30fbtft start
or
$ /etc/init.d/S30fbtft stop

On success there should be a second framebuffer device /dev/fb1 and an additional
input device e.g. /dev/input/event3

For testing the the touch I use
$ cat /dev/input/event3 | hexdump
or
$ evtest
which shows all input event devices with name and gives nice human readable output
(your have to enable the buildroot package first)...
 
Regards,
Peter