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authorVille Syrjala <syrjala@sci.fi>2008-02-06 04:39:01 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 13:41:15 -0500
commitad8dc96e3b2c3e28854e0de4ab49351ed547b30c (patch)
tree6faab05e76206f130333ccff4c080600ed00d332 /Documentation/w1
parent4cdf854f7d60498bbda436068a118b95059b244b (diff)
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-INDEX2
-rw-r--r--Documentation/w1/masters/w1-gpio33
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
4 - The Maxim/Dallas Semiconductor DS2482 provides 1-wire busses. 4 - The Maxim/Dallas Semiconductor DS2482 provides 1-wire busses.
5ds2490 5ds2490
6 - The Maxim/Dallas Semiconductor DS2490 builds USB <-> W1 bridges. 6 - The Maxim/Dallas Semiconductor DS2490 builds USB <-> W1 bridges.
7w1-gpio
8 - 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 @@
1Kernel driver w1-gpio
2=====================
3
4Author: Ville Syrjala <syrjala@sci.fi>
5
6
7Description
8-----------
9
10GPIO 1-wire bus master driver. The driver uses the GPIO API to control the
11wire and the GPIO pin can be specified using platform data.
12
13
14Example (mach-at91)
15-------------------
16
17#include <linux/w1-gpio.h>
18
19static struct w1_gpio_platform_data foo_w1_gpio_pdata = {
20 .pin = AT91_PIN_PB20,
21 .is_open_drain = 1,
22};
23
24static struct platform_device foo_w1_device = {
25 .name = "w1-gpio",
26 .id = -1,
27 .dev.platform_data = &foo_w1_gpio_pdata,
28};
29
30...
31 at91_set_GPIO_periph(foo_w1_gpio_pdata.pin, 1);
32 at91_set_multi_drive(foo_w1_gpio_pdata.pin, 1);
33 platform_device_register(&foo_w1_device);