linux-kernel - Re: [PATCH] hwmon: add Maxim MAX197 support

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Message-ID: <20120830210959.GA11153@roeck-us.net>
Date:	Thu, 30 Aug 2012 14:09:59 -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
Subject: Re: [PATCH] hwmon: add Maxim MAX197 support

On Thu, Aug 30, 2012 at 02:39:55PM -0400, Vivien Didelot wrote:
> The MAX197 is an A/D converter, made by Maxim. This driver currently
> supports the MAX197, and MAX199. They are both 8-Channel, Multi-Range,
> 5V, 12-Bit DAS with 8+4 Bus Interface and Fault Protection.
> 
> The available ranges for the MAX197 are {0,-5V} to 5V, and {0,-10V} to
> 10V, while they are {0,-2V} to 2V, and {0,-4V} to 4V on the MAX199.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

Hi Vivien,

I have the solution for the platform driver.

enum chips { max197, max199 };

[ ... ]

static struct platform_device_id max197_driver_ids[] = {
        {
		.name = "max197",
		.driver_data = max197,
	}, {
		.name = "max199",
		.driver_data = max199,
	}
};
MODULE_DEVICE_TABLE(platform, max197_driver_ids);

In the probe function:

	enum chips chip = platform_get_device_id(pdev)->driver_data;

This way you only need a single platform driver, no module alias, and you don't
need strcmp() in the probe function to detect the chip type.

Guenter
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