diff options
| author | Ville Syrjala <syrjala@sci.fi> | 2008-02-06 01:39:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:15 -0800 |
| commit | ad8dc96e3b2c3e28854e0de4ab49351ed547b30c (patch) | |
| tree | 6faab05e76206f130333ccff4c080600ed00d332 /Documentation/w1 | |
| parent | 4cdf854f7d60498bbda436068a118b95059b244b (diff) | |
| download | lwn-ad8dc96e3b2c3e28854e0de4ab49351ed547b30c.tar.gz lwn-ad8dc96e3b2c3e28854e0de4ab49351ed547b30c.zip | |
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>
Diffstat (limited to 'Documentation/w1')
| -rw-r--r-- | Documentation/w1/masters/00-INDEX | 2 | ||||
| -rw-r--r-- | Documentation/w1/masters/w1-gpio | 33 |
2 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/w1/masters/00-INDEX b/Documentation/w1/masters/00-INDEX index 752613c4cea2..7b0ceaaad7af 100644 --- a/Documentation/w1/masters/00-INDEX +++ b/Documentation/w1/masters/00-INDEX @@ -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. diff --git a/Documentation/w1/masters/w1-gpio b/Documentation/w1/masters/w1-gpio new file mode 100644 index 000000000000..af5d3b4aa851 --- /dev/null +++ b/Documentation/w1/masters/w1-gpio @@ -0,0 +1,33 @@ +Kernel driver w1-gpio +===================== + +Author: Ville Syrjala <syrjala@sci.fi> + + +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); |