From 9e60fdcf0c2905d7a8fc4cb2b3711ea5c5acaae1 Mon Sep 17 00:00:00 2001 From: eric miao Date: Mon, 4 Feb 2008 22:28:26 -0800 Subject: gpiolib: pca9539 i2c gpio expander support This adds a new-style I2C driver with basic support for the sixteen bit PCA9539 GPIO expanders. These chips have multiple registers, push-pull output drivers, and (not supported in this patch) pin change interrupts. Board-specific code must provide "pca9539_platform_data" with each chip's "i2c_board_info". That provides the GPIO numbers to be used by that chip, and callbacks for board-specific setup/teardown logic. Derived from drivers/i2c/chips/pca9539.c (which has no current known users). This is faster and simpler; it uses 16-bit register access, and cache the OUTPUT and DIRECTION registers for fast access Signed-off-by: eric miao Signed-off-by: David Brownell Acked-by: Jean Delvare Cc: Sam Ravnborg Cc: Haavard Skinnemoen Cc: Philipp Zabel Cc: Russell King Cc: Ben Gardner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/gpio/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/gpio/Kconfig') diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index d924a32c089..74fac0f5c34 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -27,6 +27,16 @@ config DEBUG_GPIO comment "I2C GPIO expanders:" +config GPIO_PCA9539 + tristate "PCA9539 16-bit I/O port" + depends on I2C + help + Say yes here to support the PCA9539 16-bit I/O port. These + parts are made by NXP and TI. + + This driver can also be built as a module. If so, the module + will be called pca9539. + config GPIO_PCF857X tristate "PCF857x, PCA857x, and PCA967x I2C GPIO expanders" depends on I2C -- cgit v1.2.3