How it's possible to unlock GPIO pins allocated by /sys/class/leds/? How can I get name of module that is using device?

recently, i had the inverse question: how to add gpios as leds

and i guess the answer i got is your answer too:
by compiling your own fw after removing the gpios from

target/linux/ar71xx/files/arch/mips/ath79/mach-gl-inet.c

my question was specific for the gl-inet, so you have to find the corresponding Source-file for your hardware

Thank you verry much, it was easy. For WR2543ND it's necessary to comment lines (/build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/linux-3.10.49/arch/mips/ath79/mach-tl-wr2543n.c) 24-59, for LEDs USB and WPS, next 69-85, for Reset and WPS buttons, and 121-125.

/*static struct gpio_led tl_wr2543n_leds_gpio[] __initdata = {
    {
        .name        = "tp-link:green:usb",
        .gpio        = TL_WR2543N_GPIO_LED_USB,
        .active_low    = 1,
    }, {
        .name        = "tp-link:green:wps",
        .gpio        = TL_WR2543N_GPIO_LED_WPS,
        .active_low    = 1,
    }
};*/

...

/*static struct gpio_keys_button tl_wr2543n_gpio_keys[] __initdata = {
    {
        .desc        = "reset",
        .type        = EV_KEY,
        .code        = KEY_RESTART,
        .debounce_interval = TL_WR2543N_KEYS_DEBOUNCE_INTERVAL,
        .gpio        = TL_WR2543N_GPIO_BTN_RESET,
        .active_low    = 1,
    }, {
        .desc        = "wps",
        .type        = EV_KEY,
        .code        = KEY_WPS_BUTTON,
        .debounce_interval = TL_WR2543N_KEYS_DEBOUNCE_INTERVAL,
        .gpio        = TL_WR2543N_GPIO_BTN_WPS,
        .active_low    = 1,
    }
};*/

...

static void __init tl_wr2543n_setup(void)
{
    u8 *mac = (u8 *) KSEG1ADDR(0x1f01fc00);
    u8 *eeprom = (u8 *) KSEG1ADDR(0x1fff1000);

    ath79_register_m25p80(&tl_wr2543n_flash_data);
    /*ath79_register_leds_gpio(-1, ARRAY_SIZE(tl_wr2543n_leds_gpio),
                 tl_wr2543n_leds_gpio);
    ath79_register_gpio_keys_polled(-1, TL_WR2543N_KEYS_POLL_INTERVAL,
                    ARRAY_SIZE(tl_wr2543n_gpio_keys),
                    tl_wr2543n_gpio_keys);*/
    ath79_register_usb();

(Last edited by jfila on 13 Nov 2014, 18:33)