linux-kernel - Re: [PATCH v4 1/2] hwmon: (ads7828) driver cleanup

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Date:	Tue, 2 Oct 2012 21:48:54 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	lm-sensors@...sensors.org, Jean Delvare <khali@...ux-fr.org>,
	linux-kernel@...r.kernel.org, Steve Hardy <shardy@...hat.com>
Subject: Re: [PATCH v4 1/2] hwmon: (ads7828) driver cleanup

On Tue, Oct 02, 2012 at 11:33:26PM -0400, Vivien Didelot wrote:
> * Remove module parameters, add a ads7828_platform_data;
> * Move driver declaration to avoid adding function prototypes;
> * Remove unused macros;
> * Coding Style fixes.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

Hi Vivien,

nice cleanup.

One more comment below. No need to re-send; I'll fix that and apply the patch to
-next.

Guenter

[ ... ]

>  /* Return 0 if detection is successful, -ENODEV otherwise */
>  static int ads7828_detect(struct i2c_client *client,
>  			  struct i2c_board_info *info)
>  {
>  	struct i2c_adapter *adapter = client->adapter;
> +	u8 default_cmd_byte = ADS7828_CMD_SD_SE | ADS7828_CMD_PD3;
>  	int ch;
>  
>  	/* Check we have a valid client */
> @@ -195,9 +161,12 @@ static int ads7828_detect(struct i2c_client *client,
>  	 * - Check the top 4 bits of each result are not set (12 data bits)
>  	 */
>  	for (ch = 0; ch < ADS7828_NCH; ch++) {
> -		u16 in_data;
> -		u8 cmd = channel_cmd_byte(ch);
> -		in_data = i2c_smbus_read_word_swapped(client, cmd);
> +		u8 cmd = ads7828_cmd_byte(default_cmd_byte, ch);
> +		u16 in_data = i2c_smbus_read_word_swapped(client, cmd);

s/u16/int/

Otherwise in_data can never be < 0.

Guenter
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