i2c: Bitbanging I2C bus driver using the GPIO API

This is a very simple bitbanging I2C bus driver utilizing the new
arch-neutral GPIO API. Useful for chips that don't have a built-in
I2C controller, additional I2C busses, or testing purposes.

To use, include something similar to the following in the
board-specific setup code:

  #include <linux/i2c-gpio.h>

  static struct i2c_gpio_platform_data i2c_gpio_data = {
	.sda_pin	= GPIO_PIN_FOO,
	.scl_pin	= GPIO_PIN_BAR,
  };
  static struct platform_device i2c_gpio_device = {
	.name		= "i2c-gpio",
	.id		= 0,
	.dev		= {
		.platform_data	= &i2c_gpio_data,
	},
  };

Register this platform_device, set up the I2C pins as GPIO if
required and you're ready to go. This will use default values for
udelay and timeout, and will work with GPIO hardware that does not
support open drain mode, but allows sensing of the SDA and SCL lines
even when they are being driven.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 8ccf6e4e91d0..33a8a67f161b 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -117,6 +117,14 @@ config I2C_ELEKTOR
           This support is also available as a module.  If so, the module 
           will be called i2c-elektor.
 
+config I2C_GPIO
+        tristate "GPIO-based bitbanging I2C"
+        depends on GENERIC_GPIO
+        select I2C_ALGOBIT
+        help
+          This is a very simple bitbanging I2C driver utilizing the
+          arch-neutral GPIO API to control the SCL and SDA lines.
+
 config I2C_HYDRA
         tristate "CHRP Apple Hydra Mac I/O I2C interface"
         depends on PCI && PPC_CHRP && EXPERIMENTAL