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acpi_ibm(4): Add support for putting fans in disengaged mode.

Browse Source 
PR:		247306
Submitted by:	Ali Abdallah <ali.abdallah@suse.com>
MFC after:	2 weeks
This commit is contained in:
Mark Johnston 2020-06-22 12:36:05 +00:00
parent 2abf05c4c6
commit 9f763f0092
2 changed files with 28 additions and 8 deletions
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11
share/man/man4/acpi_ibm.4
View File

@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd June 19, 2015
.Dd June 19, 2020
.Dt ACPI_IBM 4
.Os
.Sh NAME
@ -292,7 +292,12 @@ fan control might overheat the ThinkPad and lead to permanent damage if the
is not set accordingly.
.It Va dev.acpi_ibm.0.fan_level
Indicates at what speed the fan should run when being in manual mode.
Values are ranging from 0 (off) to 7 (max).
Valid values range from 0 (off) to 7 (max) and 8.
Level 8 is used by the driver to set the fan in disengaged mode.
In this mode, the fan is set to spin freely and will quickly reach a very
high speed.
Use this mode only if absolutely necessary, e.g., if the system has reached its
critical temperature and it is about to shut down.
The resulting speed differs from model to model.
On a T41p this is as follows:
.Pp
@ -305,6 +310,8 @@ off
~3600 RPM
.It Li 6, 7
~4300 RPM
.It Li 8
~6400 RPM (Full-speed, disengaged)
.El
.It Va dev.acpi_ibm.0.fan_speed
(read-only)

25
sys/dev/acpi_support/acpi_ibm.c
View File

@ -2,6 +2,7 @@
* Copyright (c) 2004 Takanori Watanabe
* Copyright (c) 2005 Markus Brueffer <markus@FreeBSD.org>
* All rights reserved.
* Copyright (c) 2020 Ali Abdallah <ali.abdallah@suse.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -263,7 +264,8 @@ static struct {
{
.name = "fan_level",
.method = ACPI_IBM_METHOD_FANLEVEL,
.description = "Fan level",
.description = "Fan level, 0-7 (recommended max), "
"8 (disengaged, full-speed)",
},
{
.name = "fan",
@ -829,7 +831,10 @@ acpi_ibm_sysctl_get(struct acpi_ibm_softc *sc, int method)
*/
if (!sc->fan_handle) {
ACPI_EC_READ(sc->ec_dev, IBM_EC_FANSTATUS, &val_ec, 1);
val = val_ec & IBM_EC_MASK_FANLEVEL;
if (val_ec & IBM_EC_MASK_FANDISENGAGED)
val = 8;
else
val = val_ec & IBM_EC_MASK_FANLEVEL;
}
break;
@ -912,15 +917,23 @@ acpi_ibm_sysctl_set(struct acpi_ibm_softc *sc, int method, int arg)
break;
case ACPI_IBM_METHOD_FANLEVEL:
if (arg < 0 || arg > 7)
if (arg < 0 || arg > 8)
return (EINVAL);
if (!sc->fan_handle) {
/* Read the current fanstatus */
/* Read the current fan status. */
ACPI_EC_READ(sc->ec_dev, IBM_EC_FANSTATUS, &val_ec, 1);
val = val_ec & (~IBM_EC_MASK_FANLEVEL);
val = val_ec & ~(IBM_EC_MASK_FANLEVEL |
IBM_EC_MASK_FANDISENGAGED);
return ACPI_EC_WRITE(sc->ec_dev, IBM_EC_FANSTATUS, val | arg, 1);
if (arg == 8)
/* Full speed, set the disengaged bit. */
val |= 7 | IBM_EC_MASK_FANDISENGAGED;
else
val |= arg;
return (ACPI_EC_WRITE(sc->ec_dev, IBM_EC_FANSTATUS, val,
1));
}
break;