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linux: add fbtft kernel extension

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Tested with RaspberryPi B+ and PiTFT Mini Kit - 320x240 2.8" TFT
(see [1] and [2]) and the following target configuration changes:
- cmdline.txt: add 'fbcon=map:10 fbcon=font:VGA8x8'
- add /etc/modules-load.d/fbtft.conf with 'fbtft_device'
- add /etc/modprobe.d/00-fbtft.conf with 'options fbtft_device name=adafruit28 rotate=90 gpios=dc:25'

[1] http://h65951.serverkompetenz.net/PeterSeiderer/upload/PiTFT_2_8_ct/Image9893.jpg
[2] http://h65951.serverkompetenz.net/PeterSeiderer/upload/PiTFT_2_8_ct/Image9897.jpg

[Thomas:
  - Rename prompt of the Linux extension to "FB TFT drivers"
  - Remove the full name of the kernel config options in the help
    text. Giving their CONFIG_<foo> name is enough.
  - Remove the mention of CONFIG_SPI_BCM2708, since this makes the
    description RaspberryPi specific, while these drivers can work
    with any SPI controller.
  - Refactor the code in linux-ext-fbtft.mk to avoid duplication
    between the < 3.15 and >= 3.15 cases.
  - Make the fbtft package a promptless package, since there is no
    point in selecting only this package, without the kernel
    extension.
  - Change the license to GPLv2, since it's kernel code.]

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Peter Seiderer
2015-01-03 21:01:47 +01:00
committed by Thomas Petazzoni
parent ce36c35c42
commit 9b2bbe3422
5 changed files with 71 additions and 0 deletions
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28
linux/linux-ext-fbtft.mk Normal file
View File

@@ -0,0 +1,28 @@
################################################################################
# Linux fbtft extensions
#
# Patch the linux kernel with fbtft extension
################################################################################
ifeq ($(BR2_LINUX_KERNEL_EXT_FBTFT),y)
# Add dependency to fbtft package (download helper for the fbtft source)
LINUX_DEPENDENCIES += fbtft
# for linux >= 3.15 install to drivers/video/fbdev/fbtft
# for linux < 3.15 install to drivers/video/fbtft
define FBTFT_PREPARE_KERNEL
if [ -e $(LINUX_DIR)/drivers/video/fbdev ]; then \
dest=$(LINUX_DIR)/drivers/video/fbdev ; \
else \
dest=$(LINUX_DIR)/drivers/video/ ; \
fi ; \
mkdir -p $${dest}/fbtft; \
cp -dpfr $(FBTFT_DIR)/* $${dest}/fbtft/ ; \
echo 'source "drivers/video/fbdev/fbtft/Kconfig"' \
>> $${dest}/Kconfig ; \
echo 'obj-y += fbtft/' >> $${dest}/Makefile
endef
LINUX_PRE_PATCH_HOOKS += FBTFT_PREPARE_KERNEL
endif #BR2_LINUX_KERNEL_EXT_FBTFT