Merge master.kernel.org:/home/rmk/linux-2.6-arm (ff914453) · Commits · 戴 / test

Documentation/arm/Sharp-LH/ADC-LH7-Touchscreen

0 → 100644

+61 −0

Original line number	Diff line number	Diff line
		README on the ADC/Touchscreen Controller
		========================================

		The LH79524 and LH7A404 include a built-in Analog to Digital
		controller (ADC) that is used to process input from a touchscreen.
		The driver only implements a four-wire touch panel protocol.

		The touchscreen driver is maintenance free except for the pen-down or
		touch threshold. Some resistive displays and board combinations may
		require tuning of this threshold. The driver exposes some of it's
		internal state in the sys filesystem. If the kernel is configured
		with it, CONFIG_SYSFS, and sysfs is mounted at /sys, there will be a
		directory

		/sys/devices/platform/adc-lh7.0

		containing these files.

		-r--r--r-- 1 root root 4096 Jan 1 00:00 samples
		-rw-r--r-- 1 root root 4096 Jan 1 00:00 threshold
		-r--r--r-- 1 root root 4096 Jan 1 00:00 threshold_range

		The threshold is the current touch threshold. It defaults to 750 on
		most targets.

		# cat threshold
		750

		The threshold_range contains the range of valid values for the
		threshold. Values outside of this range will be silently ignored.

		# cat threshold_range
		0 1023

		To change the threshold, write a value to the threshold file.

		# echo 500 > threshold
		# cat threshold
		500

		The samples file contains the most recently sampled values from the
		ADC. There are 12. Below are typical of the last sampled values when
		the pen has been released. The first two and last two samples are for
		detecting whether or not the pen is down. The third through sixth are
		X coordinate samples. The seventh through tenth are Y coordinate
		samples.

		# cat samples
		1023 1023 0 0 0 0 530 529 530 529 1023 1023

		To determine a reasonable threshold, press on the touch panel with an
		appropriate stylus and read the values from samples.

		# cat samples
		1023 676 92 103 101 102 855 919 922 922 1023 679

		The first and eleventh samples are discarded. Thus, the important
		values are the second and twelfth which are used to determine if the
		pen is down. When both are below the threshold, the driver registers
		that the pen is down. When either is above the threshold, it
		registers then pen is up.

Documentation/arm/Sharp-LH/LCDPanels

0 → 100644

+59 −0

Original line number	Diff line number	Diff line
		README on the LCD Panels
		========================

		Configuration options for several LCD panels, available from Logic PD,
		are included in the kernel source. This README will help you
		understand the configuration data and give you some guidance for
		adding support for other panels if you wish.


		lcd-panels.h
		------------

		There is no way, at present, to detect which panel is attached to the
		system at runtime. Thus the kernel configuration is static. The file
		arch/arm/mach-ld7a40x/lcd-panels.h (or similar) defines all of the
		panel specific parameters.

		It should be possible for this data to be shared among several device
		families. The current layout may be insufficiently general, but it is
		amenable to improvement.


		PIXEL_CLOCK
		-----------

		The panel data sheets will give a range of acceptable pixel clocks.
		The fundamental LCDCLK input frequency is divided down by a PCD
		constant in field '.tim2'. It may happen that it is impossible to set
		the pixel clock within this range. A clock which is too slow will
		tend to flicker. For the highest quality image, set the clock as high
		as possible.


		MARGINS
		-------

		These values may be difficult to glean from the panel data sheet. In
		the case of the Sharp panels, the upper margin is explicitly called
		out as a specific number of lines from the top of the frame. The
		other values may not matter as much as the panels tend to
		automatically center the image.


		Sync Sense
		----------

		The sense of the hsync and vsync pulses may be called out in the data
		sheet. On one panel, the sense of these pulses determine the height
		of the visible region on the panel. Most of the Sharp panels use
		negative sense sync pulses set by the TIM2_IHS and TIM2_IVS bits in
		'.tim2'.


		Pel Layout
		----------

		The Sharp color TFT panels are all configured for 16 bit direct color
		modes. The amba-lcd driver sets the pel mode to 565 for 5 bits of
		each red and blue and 6 bits of green.

arch/arm/Kconfig

+5 −0

Original line number	Diff line number	Diff line
		@@ -270,6 +270,11 @@ config ARCH_AT91RM9200
		Say Y here if you intend to run this kernel on an Atmel
		AT91RM9200-based board.

		config ARCH_PNX4008
		bool "Philips Nexperia PNX4008 Mobile"
		help
		This enables support for Philips PNX4008 mobile platform.

		endchoice

		source "arch/arm/mach-clps711x/Kconfig"

arch/arm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -116,6 +116,7 @@ endif
		machine-$(CONFIG_ARCH_REALVIEW) := realview
		machine-$(CONFIG_ARCH_AT91RM9200) := at91rm9200
		machine-$(CONFIG_ARCH_EP93XX) := ep93xx
		machine-$(CONFIG_ARCH_PNX4008) := pnx4008

		ifeq ($(CONFIG_ARCH_EBSA110),y)
		# This is what happens if you forget the IOCS16 line.

arch/arm/boot/compressed/head.S

+2 −2

Original line number	Diff line number	Diff line
		@@ -605,8 +605,8 @@ proc_types:
		b __armv4_mmu_cache_off
		b __armv4_mmu_cache_flush

		.word 0x00070000 @ ARMv6
		.word 0x000f0000
		.word 0x0007b000 @ ARMv6
		.word 0x0007f000
		b __armv4_mmu_cache_on
		b __armv4_mmu_cache_off
		b __armv6_mmu_cache_flush

Admin message