linux-kernel - Re: [PATCH 3/3] watchdog: Add Congatec CGEB watchdog driver

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Date:	Tue, 7 Feb 2012 16:08:56 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Jean Delvare <khali@...ux-fr.org>, linux-i2c@...r.kernel.org,
	linux-watchdog@...r.kernel.org, Ben Dooks <ben-linux@...ff.org>,
	kernel@...gutronix.de
Subject: Re: [PATCH 3/3] watchdog: Add Congatec CGEB watchdog driver

Hi Sascha,

> +struct cgeb_watchdog_stage {
> +	unsigned long timeout;
> +	unsigned long event;
> +};
> +
> +struct cgeb_watchdog_config {
> +	unsigned long size;
> +	unsigned long timeout; /* not used in staged mode */
> +	unsigned long delay;
> +	unsigned long mode;
> +	/* optional parameters for staged watchdog */
> +	unsigned long op_mode;
> +	unsigned long stage_count;
> +	struct cgeb_watchdog_stage stages[CGOS_WDOG_EVENT_MAX_STAGES];
> +};
> +

There is some unused stuff in here.

> +struct cgeb_watchdog_priv {
> +	struct cgeb_board_data	*board;
> +	struct watchdog_device	wdd;
> +	unsigned int		timeout_s;

Is wdd->timeout not sufficent?

> +	int unit;
> +};
> +
> +static int cgeb_watchdog_set_timeout(struct watchdog_device *wdd,
> +		unsigned int timeout_s)
> +{
> +	struct cgeb_watchdog_priv *priv = watchdog_get_drvdata(wdd);
> +
> +	if (!timeout_s)
> +		return -EINVAL;

Is this possible? You have min_timeout = 1.

> +static int __devinit cgeb_watchdog_probe(struct platform_device *pdev)
> +{
> +	struct cgeb_watchdog_priv *priv;
> +	struct cgeb_pdata *pdata = pdev->dev.platform_data;
> +	int ret;
> +
> +	dev_info(&pdev->dev, "registering\n");

"registered" on success would be more useful?

> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->wdd.ops = &cgeb_watchdog_ops;
> +	priv->wdd.info = &cgeb_wdd_info;
> +	priv->wdd.min_timeout = 1;
> +	priv->wdd.max_timeout = 3600;
> +	priv->board = pdata->board;
> +	priv->unit = pdata->unit;
> +
> +	watchdog_set_drvdata(&priv->wdd, priv);
> +	platform_set_drvdata(pdev, priv);
> +
> +	ret = watchdog_register_device(&priv->wdd);
> +	if (ret)
> +		return ret;
> +
> +	return 0;

return watchdog_register_device();

> +}
> +
> +static int __devexit cgeb_watchdog_remove(struct platform_device *pdev)
> +{
> +	struct cgeb_watchdog_priv *priv = platform_get_drvdata(pdev);
> +
> +	watchdog_unregister_device(&priv->wdd);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver cgeb_watchdog_driver = {
> +	.probe		= cgeb_watchdog_probe,
> +	.remove		= __exit_p(cgeb_watchdog_remove),

__devexit_p

> +	.driver	= {
> +		.name	= "cgeb-watchdog",
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +static int __init cgeb_watchdog_driver_init(void)
> +{
> +	return platform_driver_register(&cgeb_watchdog_driver);
> +}
> +
> +static void __exit cgeb_watchdog_driver_exit(void)
> +{
> +	platform_driver_unregister(&cgeb_watchdog_driver);
> +}
> +
> +module_init(cgeb_watchdog_driver_init);
> +module_exit(cgeb_watchdog_driver_exit);

module_platform_driver()

> +
> +MODULE_AUTHOR("Sascha Hauer <s.hauer@...gutronix.de>");
> +MODULE_DESCRIPTION("cgeb watchdog driver");
> +MODULE_LICENSE("GPL");

GPL v2 according to header

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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