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hwmon: (dell-smm) Increment the number of fans

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Some Alienware laptops that support the SMM interface, may have up to 4
fans.

Tested on an Alienware x15 r1.

Signed-off-by: Kurt Borja <kuurtb@gmail.com>
Link: https://lore.kernel.org/r/20250304055249.51940-2-kuurtb@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Kurt Borja 2025-03-04 00:52:50 -05:00 committed by Guenter Roeck
parent 7953605976
commit dbcfcb239b
2 changed files with 11 additions and 8 deletions
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14
Documentation/hwmon/dell-smm-hwmon.rst
View File

@ -32,12 +32,12 @@ Temperature sensors and fans can be queried and set via the standard
=============================== ======= =======================================
Name Perm Description
=============================== ======= =======================================
fan[1-3]_input RO Fan speed in RPM.
fan[1-3]_label RO Fan label.
fan[1-3]_min RO Minimal Fan speed in RPM
fan[1-3]_max RO Maximal Fan speed in RPM
fan[1-3]_target RO Expected Fan speed in RPM
pwm[1-3] RW Control the fan PWM duty-cycle.
fan[1-4]_input RO Fan speed in RPM.
fan[1-4]_label RO Fan label.
fan[1-4]_min RO Minimal Fan speed in RPM
fan[1-4]_max RO Maximal Fan speed in RPM
fan[1-4]_target RO Expected Fan speed in RPM
pwm[1-4] RW Control the fan PWM duty-cycle.
pwm1_enable WO Enable or disable automatic BIOS fan
control (not supported on all laptops,
see below for details).
@ -93,7 +93,7 @@ Again, when you find new codes, we'd be happy to have your patches!
---------------------------
The driver also exports the fans as thermal cooling devices with
``type`` set to ``dell-smm-fan[1-3]``. This allows for easy fan control
``type`` set to ``dell-smm-fan[1-4]``. This allows for easy fan control
using one of the thermal governors.
Module parameters

5
drivers/hwmon/dell-smm-hwmon.c
View File

@ -73,7 +73,7 @@
#define DELL_SMM_LEGACY_EXECUTE 0x1
#define DELL_SMM_NO_TEMP 10
#define DELL_SMM_NO_FANS 3
#define DELL_SMM_NO_FANS 4
struct smm_regs {
unsigned int eax;
@ -1074,11 +1074,14 @@ static const struct hwmon_channel_info * const dell_smm_info[] = {
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET
),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT
),
NULL