Author: markj
Date: Mon Jun 22 12:36:05 2020
New Revision: 362496
URL: https://svnweb.freebsd.org/changeset/base/362496
Log:
acpi_ibm(4): Add support for putting fans in disengaged mode.
PR: 247306
Submitted by: Ali Abdallah <ali.abdal...@suse.com>
MFC after: 2 weeks
Modified:
head/share/man/man4/acpi_ibm.4
head/sys/dev/acpi_support/acpi_ibm.c
Modified: head/share/man/man4/acpi_ibm.4
==============================================================================
--- head/share/man/man4/acpi_ibm.4 Mon Jun 22 11:03:36 2020
(r362495)
+++ head/share/man/man4/acpi_ibm.4 Mon Jun 22 12:36:05 2020
(r362496)
@@ -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 pe
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)
Modified: head/sys/dev/acpi_support/acpi_ibm.c
==============================================================================
--- head/sys/dev/acpi_support/acpi_ibm.c Mon Jun 22 11:03:36 2020
(r362495)
+++ head/sys/dev/acpi_support/acpi_ibm.c Mon Jun 22 12:36:05 2020
(r362496)
@@ -2,6 +2,7 @@
* Copyright (c) 2004 Takanori Watanabe
* Copyright (c) 2005 Markus Brueffer <mar...@freebsd.org>
* All rights reserved.
+ * Copyright (c) 2020 Ali Abdallah <ali.abdal...@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 met
*/
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 met
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;
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