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

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Date:	Thu, 10 May 2012 12:09:45 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Przemo Firszt <przemo@...szt.eu>
Cc:	pinglinux@...il.com, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, linuxwacom-devel@...ts.sourceforge.net
Subject: Re: [PATCH] HID: wacom: Add LED selector control for Wacom Intuos4
 WL

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 <przemo@...szt.eu>
[ ... snip ... ]
> @@ -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.

>  /*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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