thinkpad_acpi: add the ability setting TPACPI_LED_NONE by quirk

Some new Lenovo or ThinkPad laptops don't have EC controllable LEDs,
their LED quirks are 0. This patch set led_supported=TPACPI_LED_NONE
when quirk equals 0.
Signed-off-by: Adam Lee <adam.lee@canonical.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

drivers/platform/x86/thinkpad_acpi.c

@@ -5296,6 +5296,16 @@ static int __init led_init(struct ibm_init_struct *iibm)
 
 	led_supported = led_init_detect_mode();
 
+	if (led_supported != TPACPI_LED_NONE) {
+		useful_leds = tpacpi_check_quirks(led_useful_qtable,
+				ARRAY_SIZE(led_useful_qtable));
+
+		if (!useful_leds) {
+			led_handle = NULL;
+			led_supported = TPACPI_LED_NONE;
+		}
+	}
+
 	vdbg_printk(TPACPI_DBG_INIT, "LED commands are %s, mode %d\n",
 		str_supported(led_supported), led_supported);
 
@@ -5309,9 +5319,6 @@ static int __init led_init(struct ibm_init_struct *iibm)
 		return -ENOMEM;
 	}
 
-	useful_leds = tpacpi_check_quirks(led_useful_qtable,
-					  ARRAY_SIZE(led_useful_qtable));
-
 	for (i = 0; i < TPACPI_LED_NUMLEDS; i++) {
 		tpacpi_leds[i].led = -1;