linux-kernel - Re: [RFC ebeam PATCH v2 3/3] input: misc: New USB eBeam input driver.

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Date:	Fri, 03 Aug 2012 17:30:48 +0200
From:	Yann Cantin <yann.cantin@...oste.net>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	gregkh@...uxfoundation.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC ebeam PATCH v2 3/3] input: misc: New USB eBeam input driver.

Hi,

>> +#include <linux/hid.h>
> 
> As this driver is not a HID bus driver, why do you need this include?

Cinder, removed

>> +#define DRIVER_VERSION	"v0.7"
> 
> I don't think we need to be tracking driver versions for newly submitted 
> drivers, git is much better at tracking changes.

Old habit, removed.

>> +	u16			 X, Y;		/* raw coordinates	     */
>> +	int			 x, y;		/* computed coordinates      */
> 
> X,x being different fields seems confusing to me. How about, let's say, x, 
> raw_x?

Done.
 
>> +DEVICE_H_ATTR(1);
>> +DEVICE_H_ATTR(2);
>> +DEVICE_H_ATTR(3);
>> +DEVICE_H_ATTR(4);
>> +DEVICE_H_ATTR(5);
>> +DEVICE_H_ATTR(6);
>> +DEVICE_H_ATTR(7);
>> +DEVICE_H_ATTR(8);
>> +DEVICE_H_ATTR(9);
> 
> You are adding a number of sysfs files. If they are really necessary, 
> you'll probably need to document those in Documentation/ABI.

Will do, in testing i suppose.

BTW : The driver need lot of parameters to be passed from user-space calibration
tool. The best way to do it isn't decided yet : one sysfs file per parameter, or
one sysfs file for all, with a big sscanf parsing. Any idea ?

>> +		strlcat(ebeam->name, ")", sizeof(ebeam->name));
> 
> I'd suggest checking the length, making sure that you don't overflow the 
> ->name buffer.

Something like this ? :

if (strlcat(ebeam->name, ")", sizeof(ebeam->name))>=sizeof(ebeam->name)) {
	// overflowed, closing ) anyway
	ebeam->name[sizeof(ebeam->name)-2] = ')';

Thanks.
-- 
Yann Cantin
A4FEB47F
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