linux-kernel - Re: [PATCH v10 5/8] Loongson: YeeLoong: add hardware monitoring driver

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Date:	Thu, 17 Dec 2009 09:16:10 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	akpm@...ux-foundation.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, zhangfx@...ote.com,
	linux-laptop@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH v10 5/8] Loongson: YeeLoong: add hardware monitoring
 driver

Hi,

On Tue, 2009-12-15 at 17:24 +0800, Wu Zhangjin wrote:
> From: Wu Zhangjin <wuzhangjin@...il.com>
> 
> This can be applied between v9 4/8 and v9 6/8.
> 
> Changes from v9 5/8:
> 
> 	o ensure the fan controlling interface is compatible with the
> 	one described in Documentation/hwmon/sysfs-interface
[...]
> +/* hwmon subdriver */
> +
> +#define MIN_FAN_SPEED 0
> +#define MAX_FAN_SPEED 3
> +
> +static int get_fan_pwm_enable(void)
> +{
> +	int level, mode;
> +
> +	level = ec_read(REG_FAN_SPEED_LEVEL);
> +	mode = ec_read(REG_FAN_AUTO_MAN_SWITCH);
> +
> +	if (level == MAX_FAN_SPEED && mode == BIT_FAN_MANUAL)
> +		mode = 0;
> +	else if (mode == BIT_FAN_MANUAL)
> +		mode = 1;
> +	else
> +		mode = 2;
> +
> +	return mode;
> +}
> +
> +static void set_fan_pwm_enable(int mode)
> +{
> +	switch (mode) {
> +	case 0:
> +		/* fullspeed */
> +		ec_write(REG_FAN_AUTO_MAN_SWITCH, BIT_FAN_MANUAL);
> +		ec_write(REG_FAN_SPEED_LEVEL, MAX_FAN_SPEED);
> +		break;
> +	case 1:
> +		ec_write(REG_FAN_AUTO_MAN_SWITCH, BIT_FAN_MANUAL);
> +		break;
> +	case 2:
> +		ec_write(REG_FAN_AUTO_MAN_SWITCH, BIT_FAN_AUTO);
> +		break;
> +	default:
> +		break;
> +	}
> +}
> +
[...]
> +
> +static int yeeloong_hwmon_init(void)
> +{
> +	int ret;
> +
> +	yeeloong_hwmon_dev = hwmon_device_register(NULL);
> +	if (IS_ERR(yeeloong_hwmon_dev)) {
> +		pr_err("Fail to register yeeloong hwmon device\n");
> +		yeeloong_hwmon_dev = NULL;
> +		return PTR_ERR(yeeloong_hwmon_dev);
> +	}
> +	ret = sysfs_create_group(&yeeloong_hwmon_dev->kobj,
> +				 &hwmon_attribute_group);
> +	if (ret) {
> +		hwmon_device_unregister(yeeloong_hwmon_dev);
> +		yeeloong_hwmon_dev = NULL;
> +		return ret;
> +	}
> +	/* ensure fan is set to auto mode */
> +	set_fan_pwm_enable(BIT_FAN_AUTO);
> +

We need to change the above line to:

set_fan_pwm_enable(2);

to ensure it is compatible to the hwmon interface too.

Best Regards,
	Wu Zhangjin

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