static int create_simple_config_led_proc_entry(void)
{
if (simple_config_entry != NULL) {
printk("Already have a proc entry for /proc/simple_config!\n");
return -ENOENT;
}
simple_config_entry = proc_mkdir("simple_config", NULL);
if (!simple_config_entry)
return -ENOENT;
simulate_push_button_entry = create_proc_entry("push_button", 0644, simple_config_entry);
if (!simulate_push_button_entry)
return -ENOENT;
simulate_push_button_entry->write_proc = push_button_write;
simulate_push_button_entry->read_proc = push_button_read;
tricolor_led_entry = create_proc_entry("tricolor_led", 0644, simple_config_entry);
if (!tricolor_led_entry)
return -ENOENT;
tricolor_led_entry->write_proc = gpio_tricolor_led_write;
tricolor_led_entry->read_proc = gpio_tricolor_led_read;
/* configure gpio as outputs */
ar7100_gpio_config_output(TRICOLOR_LED_GREEN_PIN);
ar7100_gpio_config_output(TRICOLOR_LED_YELLOW_PIN);
/* switch off the led */
ar7100_gpio_out_val(TRICOLOR_LED_GREEN_PIN, OFF);
ar7100_gpio_out_val(TRICOLOR_LED_YELLOW_PIN, OFF);
return 0;
}
static int gpio_tricolor_led_write (struct file *file, const char *buf,
unsigned long count, void *data)
{
u_int32_t val, green_led_onoff = 0, yellow_led_onoff = 0;
if (sscanf(buf, "%d", &val) != 1)
return -EINVAL;
if (val >= LED_STATE_MAX)
return -EINVAL;
if (val == gpio_tricolorled)
return count;
switch (val) {
case LED_STATE_OFF :
green_led_onoff = OFF; /* both LEDs OFF */
yellow_led_onoff = OFF;
break;
case LED_STATE_GREEN:
green_led_onoff = ON; /* green ON, Yellow OFF */
yellow_led_onoff = OFF;
break;
case LED_STATE_YELLOW:
green_led_onoff = OFF; /* green OFF, Yellow ON */
yellow_led_onoff = ON;
break;
case LED_STATE_ORANGE:
green_led_onoff = ON; /* both LEDs ON */
yellow_led_onoff = ON;
break;
}
ar7100_gpio_out_val (TRICOLOR_LED_GREEN_PIN, green_led_onoff);
ar7100_gpio_out_val (TRICOLOR_LED_YELLOW_PIN, yellow_led_onoff);
gpio_tricolorled = val;
return count;
}
