Commit 9b2bbe34 authored by Peter Seiderer's avatar Peter Seiderer Committed by Thomas Petazzoni
Browse files

linux: add fbtft kernel extension 

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: default avatarPeter Seiderer <ps.report@gmx.net>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent ce36c35c

linux/Config.ext.in

+18 −0
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@@ -42,4 +42,22 @@ config BR2_LINUX_KERNEL_EXT_RTAI_PATCH 
	help

	  Optionally, explicitly specify the RTAI patch to use.



# fbtft

config BR2_LINUX_KERNEL_EXT_FBTFT

	bool "FB TFT drivers"

	select BR2_PACKAGE_FBTFT

	help

	  Linux Framebuffer drivers for small TFT LCD display modules,

	  e.g. Adafruit PiTFT displays for Raspberry Pi.



	  To enable fbtft, e.g. for Adafruit 2.8 PiTFT, enable the

	  following kernel configurations:

	  - CONFIG_SPI

	  - CONFIG_GPIOLIB

	  - CONFIG_FB

	  - CONFIG_FB_TFT

	  - CONFIG_FB_TFT_ILI9341



	  https://github.com/notro/fbtft



endmenu

linux/linux-ext-fbtft.mk

0 → 100644
+28 −0
Original line number Diff line number Diff line 
################################################################################

# 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

package/Config.in

+1 −0
Original line number Diff line number Diff line
@@ -313,6 +313,7 @@ endif 
	source "package/evemu/Config.in"

	source "package/evtest/Config.in"

	source "package/fan-ctrl/Config.in"

	source "package/fbtft/Config.in"

	source "package/fconfig/Config.in"

	source "package/fis/Config.in"

	source "package/flashrom/Config.in"

package/fbtft/Config.in

0 → 100644
+13 −0
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# Prompt-less option, because this package is not doing anything

# except downloading the FB TFT sources. The real work is done by a

# Linux extension.

config BR2_PACKAGE_FBTFT

	bool

	depends on BR2_LINUX_KERNEL

	help

	  Linux Framebuffer drivers for small TFT LCD display modules,

	  e.g. Adafruit PiTFT displays for Raspberry Pi.



	  This is only the download helper for the kernel patch.



	  https://github.com/notro/fbtft

package/fbtft/fbtft.mk

0 → 100644
+11 −0
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################################################################################

#

# fbtft

#

################################################################################



FBTFT_VERSION = 274035404701245e7491c0c6471c5b72ade4d491

FBTFT_SITE = $(call github,notro,fbtft,$(FBTFT_VERSION))

FBTFT_LICENSE = GPLv2



$(eval $(generic-package))