From 7d3d88401fb75081e731d62c1c79584413525aa6 Mon Sep 17 00:00:00 2001 From: Haridhar Kalvala Date: Wed, 28 Mar 2018 14:16:10 +0800 Subject: [PATCH] HID: google: Enable PM Full On mode when adjusting backlight hammer LED backlight brightness is not getting set when USB device is in suspend state. This patch fixes the issue by requesting USB HID device to be in FULLON mode, so that sending hardware output report and hardware raw request won't fail to set brightness, and set device back to NORMAL mode once this call returns. Signed-off-by: Haridhar Kalvala Reviewed-by: Dmitry Torokhov Signed-off-by: Nicolas Boichat Signed-off-by: Jiri Kosina --- drivers/hid/hid-google-hammer.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) 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; }