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i8k: make fan multiplier tunable with a module parameter 

The i8k driver multiplies the fan speed reported by the BIOS with a factor of
30.  On my Dell Latitude D800, this factor is not required.

I'd suggest to make this configurable.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Jochen Eisinger 2008-05-01 04:34:58 -07:00 committed by Linus Torvalds
parent af8e2a4cb9
commit 4ed99a27d1
1 changed files with 5 additions and 1 deletions
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6
drivers/char/i8k.c
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@ -77,6 +77,10 @@ static int power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
static int fan_mult = I8K_FAN_MULT;
module_param(fan_mult, int, 0);
MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
static int i8k_open_fs(struct inode *inode, struct file *file);
static int i8k_ioctl(struct inode *, struct file *, unsigned int,
unsigned long);
@ -239,7 +243,7 @@ static int i8k_get_fan_speed(int fan)
struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
regs.ebx = fan & 0xff;
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * fan_mult;
}
/*