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HID: hid-led: add support for reading from LED devices 

Add support for reading data from LED devices.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Heiner Kallweit 2016-06-21 21:48:46 +02:00 committed by Jiri Kosina
parent 5bc839367b
commit 4374573008
1 changed files with 29 additions and 0 deletions
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29
drivers/hid/hid-led.c
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@ -115,6 +115,35 @@ static int hidled_send(struct hidled_device *ldev, __u8 *buf)
return ret == ldev->config->report_size ? 0 : -EMSGSIZE;
}
/* reading data is supported for report type RAW_REQUEST only */
static int hidled_recv(struct hidled_device *ldev, __u8 *buf)
{
int ret;
if (ldev->config->report_type != RAW_REQUEST)
return -EINVAL;
buf[0] = ldev->config->report_id;
mutex_lock(&ldev->lock);
ret = hid_hw_raw_request(ldev->hdev, buf[0], buf,
ldev->config->report_size,
HID_FEATURE_REPORT,
HID_REQ_SET_REPORT);
if (ret < 0)
goto err;
ret = hid_hw_raw_request(ldev->hdev, buf[0], buf,
ldev->config->report_size,
HID_FEATURE_REPORT,
HID_REQ_GET_REPORT);
err:
mutex_unlock(&ldev->lock);
return ret < 0 ? ret : 0;
}
static u8 riso_kagaku_index(struct hidled_rgb *rgb)
{
enum led_brightness r, g, b;