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: 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>

Author: kuu-rt

Documentation/hwmon/dell-smm-hwmon.rst

@@ -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

@@ -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