linux-kernel - Re: [PATCH 03/14 v3] Input: atmel_mxt_ts - refactor mxt_read/write

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Message-ID: <20120509055411.GG10514@core.coreip.homeip.net>
Date:	Tue, 8 May 2012 22:54:11 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Nick Dyer <nick.dyer@...ev.co.uk>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>, khali@...ux-fr.org
Subject: Re: [PATCH 03/14 v3] Input: atmel_mxt_ts - refactor
 mxt_read/write_reg to take a length

Hi Daniel,

On Wed, Apr 18, 2012 at 09:21:48PM +0800, Daniel Kurtz wrote:
> +	ret = i2c_transfer(client->adapter, xfer, 2);
> +	if (ret != 2) {
> +		dev_err(&client->dev, "i2c read reg failed (%d)\n", ret);
> +		if (ret >= 0)
> +			ret = -EIO;
>  	}
>  
> -	return 0;
> +	return (ret == 2) ? 0 : ret;
>  }

Would prefer:

	ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
	if (ret != ARRAY_SIZE(xfer)) {
		if (ret >= 0)
			ret = -EIO;
		dev_err(&client->dev, "i2c read reg failed (%d)\n", ret);
		return ret;
	}

	return 0;


Or maybe we need i2c_transfer_exact() wrapper? Jean?

Thanks.

-- 
Dmitry
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