On Wed, May 21, 2014 at 11:19:28PM -0300, Flavio Leitner wrote: > From: Flavio Leitner <f...@sysclose.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 > > Signed-off-by: Flavio Leitner <f...@sysclose.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));
pwm value range is limited to (0, 255), so we'll have to find another solution. I think we'll have to define a per-system data structure which holds the fan speed range and the fan multiplier, and attach it to the dmi data. Currently, .driver_data is used directly to override the fan multiplier; it will have to point to a configuration data structure with both fan multiplier and maximum fan speed value. Unless someone has a better idea, of course. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
