DevKit8500D/A User Manual - DMCS Pages for Students

GFP_KERNEL);
…
for (i = 0; i < pdata->num_leds; i++) {
ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
&pdev->dev, pdata->gpio_blink_set);
if (ret < 0)
goto err;
}
…
}
static int __devinit create_gpio_led(const struct gpio_led *template,
struct gpio_led_data *led_dat, struct device *parent,
int (*blink_set)(unsigned, unsigned long *, unsigned long *))
{
…
ret = gpio_request(template->gpio, template->name);
…
ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
…
ret = led_classdev_register(parent, &led_dat->cdev);
…
}
c) User can access brightness file on the directory of /sys/class/leds/xxx/, called function
gpio_led_set to configure led states.
static void gpio_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
…
gpio_set_value(led_dat->gpio, level);
}
55