From 4374573008df08a3a7a84cd827ed8f1ceee9901b Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Tue, 21 Jun 2016 21:48:46 +0200
Subject: 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>
---
drivers/hid/hid-led.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
(limited to 'drivers/hid')
diff --git a/drivers/hid/hid-led.c b/drivers/hid/hid-led.c
index d5d8d941c4b0..4075f095c2a2 100644
--- a/drivers/hid/hid-led.c
+++ b/drivers/hid/hid-led.c
@@ -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;
--
cgit