[PATCH] platform/x86: dell-laptop: don't register platform::micmute if the related tokens don't exist.

[koba . ko]

From: Koba Ko <koba...@canonical.com>

First, 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...@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 1e46022fb2c5..afc1ded83e56 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -2208,10 +2208,13 @@ 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