linux-kernel - Re: [PATCH] identify firmware version

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Message-ID: <4C7EB3A3.7050402@gmail.com>
Date:	Wed, 01 Sep 2010 22:12:19 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Rafi Rubin <rafi@...s.upenn.edu>
CC:	dmitry.torokhov@...il.com, jkosina@...e.cz,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	micki@...rig.com, rydberg@...omail.se, chatty@...c.fr
Subject: Re: [PATCH] identify firmware version

On 09/01/2010 11:48 AM, Rafi Rubin wrote:
> --- a/drivers/hid/hid-ntrig.c
> +++ b/drivers/hid/hid-ntrig.c
> @@ -90,6 +90,26 @@ struct ntrig_data {
>  };
>  
>  
> +/*
> + * This function converts the 4 byte raw firmware code into
> + * a string containing 5 comma separated numbers.
> + */
> +static int ntrig_version_string(unsigned char *raw, char *buf)
> +{
> +	__u8 a =  (raw[1] & 0b00001110) >> 1;
> +	__u8 b =  (raw[0] & 0b00111100) >> 2;
> +	__u8 c = ((raw[0] & 0b00000011) << 3) | ((raw[3] & 0b11100000) >> 5);
> +	__u8 d = ((raw[3] & 0b00000111) << 3) | ((raw[2] & 0b11100000) >> 5);
> +	__u8 e =   raw[2] & 0b00000111;

This won't compile with gcc 3.4 which we still support. Maybe time to
kill the support?

...
> @@ -848,10 +871,39 @@ static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
>  	if (report)
>  		usbhid_submit_report(hdev, report, USB_DIR_OUT);
>  
> +	data = kmalloc(8, GFP_KERNEL);
> +	if (!data) {
> +		ret = -ENOMEM;
> +		goto err_free;
> +	}
> +
> +	ret = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
> +			      USB_REQ_CLEAR_FEATURE,
> +			      USB_TYPE_CLASS | USB_RECIP_INTERFACE |
> +			      USB_DIR_IN,
> +			      0x30c, 1, data, 8,
> +			      USB_CTRL_SET_TIMEOUT);
> +
> +	if (ret == 8) {
> +		buf = kmalloc(20, GFP_KERNEL);
> +		if (!buf) {
> +			ret = -ENOMEM;
> +			goto err_free_data;
> +		}
> +
> +		ret = ntrig_version_string(&data[2], buf);
> +
> +		dev_info(&hdev->dev,
> +			 "Firmware version: %s (%02x%02x %02x%02x)\n",
> +			 buf, data[2], data[3], data[4], data[5]);
> +	}
> +
>  	ret = sysfs_create_group(&hdev->dev.kobj,
>  			&ntrig_attribute_group);
>  
>  	return 0;

Two leaks here.

> +err_free_data:
> +	kfree(data);
>  err_free:
>  	kfree(nd);
>  	return ret;


-- 
js
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