FogBugz #84276: lcd driver on i2c

Supports the Newhaven NHD‐0216K3Z‐NSW‐BBW 2x16 LCD module as i2c slave.
Device will show up as a ttyLCD*

 * Backspace is supported to the beginning of the current line.
    * i.e. printf '\b' > /dev/ttyLCD0

 * ESC [ 2 J
    * erase whole display and reset cursor to home.
    * i.e. printf '\e[2J' > /dev/ttyLCD0

 * ESC [ 2 K
    * erase current line and set cursor to beginning of line.
    * i.e. printf '\e[2K' > /dev/ttyLCD0

 * CR and LF are supported.

 * Vertical scroll when cursor is on bottom line and receive end of line.

Set the I2C0 I2C adapter to standard speed as LCD supports 100KHz I2C.

Signed-off-by: Alan Tull <[email protected]>

Author: Alan Tull

Documentation/devicetree/bindings/tty/newhaven_lcd.txt

@@ -0,0 +1,21 @@
+* TTY on a Newhaven NHD‐0216K3Z‐NSW‐BBW LCD connected to I2C
+
+Required properties:
+- compatible: Should be "newhaven,nhd‐0216k3z‐nsw‐bbw";
+- reg: i2c address
+- height: should be 2 lines
+- width: should be 16 characters
+- brightness: backlight brightness. Range is 1 to 8, where
+              1=OFF and 8=maximum brightness.
+
+Example:
+
+&i2c0 {
+	lcd: lcd@28 {
+		compatible = "newhaven,nhd‐0216k3z‐nsw‐bbw";
+		reg = <0x28>;
+		height = <2>;
+		width = <16>;
+		brightness = <8>;
+	};
+

drivers/tty/Kconfig

@@ -151,6 +151,25 @@ config LEGACY_PTY_COUNT
 	  When not in use, each legacy PTY occupies 12 bytes on 32-bit
 	  architectures and 24 bytes on 64-bit architectures.
 
+config BFIN_JTAG_COMM
+	tristate "Blackfin JTAG Communication"
+	depends on BLACKFIN
+	help
+	  Add support for emulating a TTY device over the Blackfin JTAG.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bfin_jtag_comm.
+
+config BFIN_JTAG_COMM_CONSOLE
+	bool "Console on Blackfin JTAG"
+	depends on BFIN_JTAG_COMM=y
+
+config NEWHAVEN_LCD
+       tristate "NEWHAVEN LCD"
+       depends on I2C
+       help
+         Add support for a TTY device on a Newhaven I2C LCD device.
+
 config SERIAL_NONSTANDARD
 	bool "Non-standard serial port support"
 	depends on HAS_IOMEM

drivers/tty/Makefile

@@ -34,5 +34,6 @@ obj-$(CONFIG_PPC_EPAPR_HV_BYTECHAN) += ehv_bytechan.o
 obj-$(CONFIG_GOLDFISH_TTY)	+= goldfish.o
 obj-$(CONFIG_MIPS_EJTAG_FDC_TTY) += mips_ejtag_fdc.o
 obj-$(CONFIG_VCC)		+= vcc.o
+obj-$(CONFIG_NEWHAVEN_LCD)	+= newhaven_lcd.o
 
 obj-y += ipwireless/