Commit dbcfcb23 authored by Kurt Borja's avatar Kurt Borja Committed by Guenter Roeck
Browse files

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



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

Tested on an Alienware x15 r1.

Signed-off-by: default avatarKurt Borja <kuurtb@gmail.com>
Link: https://lore.kernel.org/r/20250304055249.51940-2-kuurtb@gmail.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 79536059

Documentation/hwmon/dell-smm-hwmon.rst

+7 −7
Original line number Diff line number Diff line
@@ -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

drivers/hwmon/dell-smm-hwmon.c

+4 −1
Original line number Diff line number Diff line
@@ -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