thinkpad-acpi: don't depend on led_path for led firmware type (v2)

Don't depend on the contents of led_path to know which LED interface
the firmware wants.

This removes the only user of *_path for the thinkpad-acpi ACPI
handlers, which will simplify future code.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>

1 files changed, 28 insertions, 19 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index a39f159d4f2f..29ad27346443 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -5009,11 +5009,7 @@ enum {	/* For TPACPI_LED_OLD */
 
 static enum led_access_mode led_supported;
 
-TPACPI_HANDLE(led, ec, "SLED",  /* 570 */
-           "SYSL",              /* 600e/x, 770e, 770x, A21e, A2xm/p, */
-                                /* T20-22, X20-21 */
-           "LED",               /* all others */
-           );                   /* R30, R31 */
+static acpi_handle led_handle;
 
 #define TPACPI_LED_NUMLEDS 16
 static struct tpacpi_led_classdev *tpacpi_leds;
@@ -5273,6 +5269,32 @@ static const struct tpacpi_quirk led_useful_qtable[] __initconst = {
 #undef TPACPI_LEDQ_IBM
 #undef TPACPI_LEDQ_LNV
 
+static enum led_access_mode __init led_init_detect_mode(void)
+{
+        acpi_status status;
+
+        if (tpacpi_is_ibm()) {
+                /* 570 */
+                status = acpi_get_handle(ec_handle, "SLED", &led_handle);
+                if (ACPI_SUCCESS(status))
+                        return TPACPI_LED_570;
+
+                /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
+                status = acpi_get_handle(ec_handle, "SYSL", &led_handle);
+                if (ACPI_SUCCESS(status))
+                        return TPACPI_LED_OLD;
+        }
+
+        /* most others */
+        status = acpi_get_handle(ec_handle, "LED", &led_handle);
+        if (ACPI_SUCCESS(status))
+                return TPACPI_LED_NEW;
+
+        /* R30, R31, and unknown firmwares */
+        led_handle = NULL;
+        return TPACPI_LED_NONE;
+}
+
 static int __init led_init(struct ibm_init_struct *iibm)
 {
         unsigned int i;
@@ -5281,20 +5303,7 @@ static int __init led_init(struct ibm_init_struct *iibm)
 
         vdbg_printk(TPACPI_DBG_INIT, "initializing LED subdriver\n");
 
-        TPACPI_ACPIHANDLE_INIT(led);
-
-        if (!led_handle)
-                /* led not supported on R30, R31 */
-                led_supported = TPACPI_LED_NONE;
-        else if (tpacpi_is_ibm() && strlencmp(led_path, "SLED") == 0)
-                /* 570 */
-                led_supported = TPACPI_LED_570;
-        else if (tpacpi_is_ibm() && strlencmp(led_path, "SYSL") == 0)
-                /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
-                led_supported = TPACPI_LED_OLD;
-        else
-                /* all others */
-                led_supported = TPACPI_LED_NEW;
+        led_supported = led_init_detect_mode();
 
         vdbg_printk(TPACPI_DBG_INIT, "LED commands are %s, mode %d\n",
                 str_supported(led_supported), led_supported);