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I want to use a DS18B20 which is a temperature sensor with one wire bus. Because the Sheevaplug hat many useable gpios I want to try it with one of them since now without success
(i use a debian kernel: 2.6.36-rc6)I added this to the /usr/src/linux-source-2.6.36-rc6/arch/arm/mach-kirkwood/sheevaplug-setup.c:
Code:
#include <linux/w1-gpio.h>
...
static struct w1_gpio_platform_data w1_gpio_pdata = {
.pin = MPP30_GPIO,
.is_open_drain = 1,
};
static struct platform_device foo_device_w1 = {
.name = "w1-gpio",
.id = -1,
.dev.platform_data = &w1_gpio_pdata,
};
...
static unsigned int sheevaplug_mpp_config[] __initdata = {
MPP29_GPIO, /* USB Power Enable */
MPP46_GPIO, /* LED green*/
MPP47_GPIO, /* LED orange*/
MPP30_GPIO, /* GPIO for w1-gpio */
0,
};
...
static void __init sheevaplug_init(void)
{
...
/* setup w1-gpio */
platform_device_register(&foo_device_w1);
}
...
static struct w1_gpio_platform_data w1_gpio_pdata = {
.pin = MPP30_GPIO,
.is_open_drain = 1,
};
static struct platform_device foo_device_w1 = {
.name = "w1-gpio",
.id = -1,
.dev.platform_data = &w1_gpio_pdata,
};
...
static unsigned int sheevaplug_mpp_config[] __initdata = {
MPP29_GPIO, /* USB Power Enable */
MPP46_GPIO, /* LED green*/
MPP47_GPIO, /* LED orange*/
MPP30_GPIO, /* GPIO for w1-gpio */
0,
};
...
static void __init sheevaplug_init(void)
{
...
/* setup w1-gpio */
platform_device_register(&foo_device_w1);
}
I also enabled one wire master gpio support in the kernel config
# modprobe w1-gpio
FATAL: Error inserting w1_gpio (/lib/modules/2.6.36-rc6/kernel/drivers/w1/masters/w1-gpio.ko): No such device
and demsg says:
# dmesg
[ 5977.291208] gpio_request: gpio-503838 (w1) status -22
[ 5977.291227] w1-gpio: probe of w1-gpio failed with error -22
I have no idea how to solve this problem.