diff options
| -rw-r--r-- | drivers/hid/hid-google-hammer.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c index 6486469ce0f6..7b8e17b03cb8 100644 --- a/drivers/hid/hid-google-hammer.c +++ b/drivers/hid/hid-google-hammer.c @@ -41,6 +41,16 @@ static int hammer_kbd_brightness_set_blocking(struct led_classdev *cdev, led->buf[0] = 0; led->buf[1] = br; + /* + * Request USB HID device to be in Full On mode, so that sending + * hardware output report and hardware raw request won't fail. + */ + ret = hid_hw_power(led->hdev, PM_HINT_FULLON); + if (ret < 0) { + hid_err(led->hdev, "failed: device not resumed %d\n", ret); + return ret; + } + ret = hid_hw_output_report(led->hdev, led->buf, sizeof(led->buf)); if (ret == -ENOSYS) ret = hid_hw_raw_request(led->hdev, 0, led->buf, @@ -50,6 +60,10 @@ static int hammer_kbd_brightness_set_blocking(struct led_classdev *cdev, if (ret < 0) hid_err(led->hdev, "failed to set keyboard backlight: %d\n", ret); + + /* Request USB HID device back to Normal Mode. */ + hid_hw_power(led->hdev, PM_HINT_NORMAL); + return ret; } |