[PATCH 1/1][SRU][OEM-5.6] UBUNTU: SAUCE: platform/x86: dell-laptop: don't register platform::micmute if the related tokens don't exist.

[koba.ko at canonical.com]

From: Koba Ko <koba.ko at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1877275

Error messge is issued,
"platform::micmute: Setting an LED's brightness failed (-19)",
Even the device isn't presented.

Get the related tokens of SMBIOS, GLOBAL_MIC_MUTE_DISABLE/ENABLE.
If one of two tokens doesn't exist, don't register platform::micmute.

Signed-off-by: Koba Ko <koba.ko at canonical.com>
(cherry picked from commit f0a165c6311a4b8c7b45bafcb4806f105f0e7aa1)
Signed-off-by: Koba Ko <koba.ko at canonical.com>
---
 drivers/platform/x86/dell-laptop.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 74e988f839e8..4c1dd1d4e60b 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -2204,10 +2204,13 @@ static int __init dell_init(void)
 
 	dell_laptop_register_notifier(&dell_laptop_notifier);
 
-	micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
-	ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
-	if (ret < 0)
-		goto fail_led;
+	if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
+	    dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE)) {
+		micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
+		ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
+		if (ret < 0)
+			goto fail_led;
+	}
 
 	if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
 		return 0;
-- 
2.17.1