w1-gpio: add GPIO w1 bus master driver

Add a GPIO 1-wire bus master driver.  The driver used the GPIO API to
control the wire and the GPIO pin can be specified using platform data
similar to i2c-gpio.  The driver was tested with AT91SAM9260 + DS2401.

Signed-off-by: Ville Syrjala <syrjala@sci.fi>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/w1/masters/Kconfig b/drivers/w1/masters/Kconfig
index 8236d447adf5..c4493091c655 100644
--- a/drivers/w1/masters/Kconfig
+++ b/drivers/w1/masters/Kconfig
@@ -42,5 +42,15 @@ config W1_MASTER_DS1WM
           in HP iPAQ devices like h5xxx, h2200, and ASIC3-based like
           hx4700.
 
+config W1_MASTER_GPIO
+        tristate "GPIO 1-wire busmaster"
+        depends on GENERIC_GPIO
+        help
+          Say Y here if you want to communicate with your 1-wire devices using
+          GPIO pins. This driver uses the GPIO API to control the wire.
+
+          This support is also available as a module.  If so, the module
+          will be called w1-gpio.ko.
+
 endmenu