linux-kernel - Re: [PATCH] i8k: increase fan limit to 3

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Date:	Wed, 21 May 2014 20:32:24 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Flavio Leitner <fbl@...hat.com>, linux-kernel@...r.kernel.org
CC:	Arnd Bergmann <arnd@...db.de>, Flavio Leitner <fbl@...close.org>
Subject: Re: [PATCH] i8k: increase fan limit to 3

On 05/21/2014 07:19 PM, Flavio Leitner wrote:
> From: Flavio Leitner <fbl@...close.org>
>
> It is possible to increase left fan speed on a
> DELL Precision 490n system up to 3.
>
>      value    fan rpm
>        1      35460
>        2      64740
>        3      78510
>
Guess the speed factor 30 doesn't apply here.

> Signed-off-by: Flavio Leitner <fbl@...close.org>
> ---
>   drivers/char/i8k.c       | 4 ++--
>   include/uapi/linux/i8k.h | 3 ++-
>   2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
> index d915707..99180f0 100644
> --- a/drivers/char/i8k.c
> +++ b/drivers/char/i8k.c
> @@ -519,7 +519,7 @@ static ssize_t i8k_hwmon_show_pwm(struct device *dev,
>   	status = i8k_get_fan_status(index);
>   	if (status < 0)
>   		return -EIO;
> -	return sprintf(buf, "%d\n", clamp_val(status * 128, 0, 255));
> +	return sprintf(buf, "%d\n", clamp_val(status * 128, 0, 384));
>   }
>
>   static ssize_t i8k_hwmon_set_pwm(struct device *dev,
> @@ -533,7 +533,7 @@ static ssize_t i8k_hwmon_set_pwm(struct device *dev,
>   	err = kstrtoul(buf, 10, &val);
>   	if (err)
>   		return err;
> -	val = clamp_val(DIV_ROUND_CLOSEST(val, 128), 0, 2);
> +	val = clamp_val(DIV_ROUND_CLOSEST(val, 128), 0, 3);
>
>   	mutex_lock(&i8k_mutex);
>   	err = i8k_set_fan(index, val);
> diff --git a/include/uapi/linux/i8k.h b/include/uapi/linux/i8k.h
> index 1c45ba5..133d02f 100644
> --- a/include/uapi/linux/i8k.h
> +++ b/include/uapi/linux/i8k.h
> @@ -34,7 +34,8 @@
>   #define I8K_FAN_OFF		0
>   #define I8K_FAN_LOW		1
>   #define I8K_FAN_HIGH		2
> -#define I8K_FAN_MAX		I8K_FAN_HIGH
> +#define I8K_FAN_TURBO		3
> +#define I8K_FAN_MAX		I8K_FAN_TURBO
>
>   #define I8K_VOL_UP		1
>   #define I8K_VOL_DOWN		2
>

I'll have to test this on older systems to make sure it doesn't cause problems there.

Guenter

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