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w1-gpio: add GPIO w1 bus master driver

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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 <[email protected]>
Cc: Evgeniy Polyakov <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ville Syrjala 2008-02-06 01:39:01 -08:00 • committed by Linus Torvalds
commit ad8dc96e3b
6 changed files with 193 additions and 0 deletions
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2
Documentation/w1/masters/00-INDEX
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@ -4,3 +4,5 @@ ds2482
- The Maxim/Dallas Semiconductor DS2482 provides 1-wire busses.
ds2490
- The Maxim/Dallas Semiconductor DS2490 builds USB <-> W1 bridges.
w1-gpio
- GPIO 1-wire bus master driver.

33
Documentation/w1/masters/w1-gpio Normal file
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@ -0,0 +1,33 @@
Kernel driver w1-gpio
=====================
Author: Ville Syrjala <[email protected]>
Description
-----------
GPIO 1-wire bus master driver. The driver uses the GPIO API to control the
wire and the GPIO pin can be specified using platform data.
Example (mach-at91)
-------------------
#include <linux/w1-gpio.h>
static struct w1_gpio_platform_data foo_w1_gpio_pdata = {
.pin = AT91_PIN_PB20,
.is_open_drain = 1,
};
static struct platform_device foo_w1_device = {
.name = "w1-gpio",
.id = -1,
.dev.platform_data = &foo_w1_gpio_pdata,
};
...
at91_set_GPIO_periph(foo_w1_gpio_pdata.pin, 1);
at91_set_multi_drive(foo_w1_gpio_pdata.pin, 1);
platform_device_register(&foo_w1_device);