Thread (3 messages) flat view 3 messages, 2 authors, 2012-05-10

Re: [PATCH] HID: wacom: Add LED selector control for Wacom Intuos4 WL

From: Jiri Kosina <hidden>
Date: 2012-05-10 10:09:54
Also in: lkml

On Mon, 7 May 2012, Przemo Firszt wrote:
Add sysfs attribute to control LED selector on Wacom Intuos4. There are 4
different LEDs on the tablet and they can be turned on by something like:

echo 50 > /sys/class/leds/(device # here)\:selector\:1/brightness

Only one can be lit at a time. The brightness range is 0 to 127. This patch
also contains short ABI description.

Signed-off-by: Przemo Firszt <redacted>
[ ... snip ... ]
quoted hunk ↗ jump to hunk
@@ -44,6 +47,8 @@ struct wacom_data {
 	__u8 ps_connected;
 	struct power_supply battery;
 	struct power_supply ac;
+	__u8 led_selector;
+	struct led_classdev *leds[3];
Here you define the leds[] array to have 3 members.
quoted hunk ↗ jump to hunk
 /*percent of battery capacity for Graphire
@@ -64,6 +69,117 @@ static enum power_supply_property wacom_ac_props[] = {
 	POWER_SUPPLY_PROP_SCOPE,
 };
 
+static void wacom_leds_set_brightness(struct led_classdev *led_dev,
+						enum led_brightness value)
+{
+	struct device *dev = led_dev->dev->parent;
+	struct hid_device *hdev;
+	struct wacom_data *wdata;
+	unsigned char *buf;
+	__u8 led = 0;
+	int i;
+
+	hdev = container_of(dev, struct hid_device, dev);
+	wdata = hid_get_drvdata(hdev);
+	for (i = 0; i < 4; ++i) {
And here you are going off-by-one.
+		if (wdata->leds[i] == led_dev)
+			wdata->led_selector = i;
+	}
+
+	led = wdata->led_selector | 0x04;
+	buf = kzalloc(9, GFP_KERNEL);
+	if (buf) {
+		buf[0] = WAC_CMD_LED_CONTROL;
+		buf[1] = led;
+		buf[2] = value;
+		hdev->hid_output_raw_report(hdev, buf, 9, HID_FEATURE_REPORT);
+		kfree(buf);
+	}
+
+	return;
+}
+
+static enum led_brightness wacom_leds_get_brightness(struct led_classdev *led_dev)
+{
+	struct wacom_data *wdata;
+	struct device *dev = led_dev->dev->parent;
+	int value = 0;
+	int i;
+
+	wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));
+
+	for (i = 0; i < 4; ++i) {
And here as well.

Otherwise the patch looks fine, and once you fix this, I will apply it. 
Thanks,

-- 
Jiri Kosina
SUSE Labs
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