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March 2010

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[RFC][PATCH v2 0/5] omap1: Amstrad Delta: add support for external keyboard
by Janusz Krzysztofik 12 Apr '10

12 Apr '10

This series of patches adds support for an external keyboard (called mailboard) connected to the Amstrad Delta (E3) videophone. The series is based on a patch by Matt Callow, created against linux-omap-2.6.19[1], initially submitted to the e3-hacking mailing list in April 2006[2]. Since the keyboard serial clock line is connected to a GPIO line, it generates interrupts every single bit received. In order to handle this correctly, the code makes use of a FIQ hardware feature. Since all GPIO generated interrupts would be converted to FIQ, the handler must include support for all supported GPIO connected devices: the keyboard, a modem and a hook switch. My modifications to the original patch include: - split into several patches, - refresh against a recent linux version, - a lot of cleanups, mainly to get rid of checkpatch reported issues, - add support for handling interrupts generated by a GPIO line that the meanwhile activated hook switch hangs off. v2 changes: - remove scan code to key code mapping from the serio driver, that doesn't belong here and should be set up from userspace; thanks to Dmitry Torokhov for advising this, - no funtional changes in FIQ part (there were no comments in round 1). There is still one minor issue that I was not able to deal with: when built with CONFIG_OMAP_RESET_CLOCKS=y, the keyboard driver stops working. I have no idea how I could find which clock I should enable to get it working regardless of boot loader used. Any suggestions? Created and tested against linux-2.6.34-rc2. Janusz Krzysztofik(5) omap1: Amstrad Delta: add FIQ handler for serial keyboard port interrupt processing omap1: Amstrad Delta: add a handler for processing interrupts generated by the FIQ routine omap1: Amstrad Delta: use FIQ for processing GPIO interrupts input: serio: add support for Amstrad Delta serial keyboard port omap1: Amstrad Delta: modify defconfig for external keyboard support arch/arm/configs/ams_delta_defconfig | 2 arch/arm/mach-omap1/Kconfig | 8 arch/arm/mach-omap1/Makefile | 3 arch/arm/mach-omap1/ams-delta-fiq-handler.S | 342 +++++++++++++++++++++++ arch/arm/mach-omap1/ams-delta-fiq.c | 175 +++++++++++ arch/arm/mach-omap1/board-ams-delta.c | 6 arch/arm/mach-omap1/include/mach/ams-delta-fiq.h | 57 +++ arch/arm/plat-omap/include/plat/irqs.h | 4 drivers/input/serio/Kconfig | 9 drivers/input/serio/Makefile | 1 drivers/input/serio/ams_delta_keyboard.c | 171 +++++++++++ 11 files changed, 777 insertions(+), 1 deletion(-) Thanks, Janusz [1] http://the.earth.li/pub/e3/2.6.19/ams-delta-keyboard.patch [2] http://www.earth.li/pipermail/e3-hacking/2006-April/000453.html

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