[PATCH 3/5] thermal: intel: int340x: Add module parameter for balanced Slider

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

By default, the SoC slider value for the "balanced" platform profile is
set to 3. A new module parameter is introduced to allow users to change
this default value. After modifying the module parameter, users must call
an update to the "profile" sysfs attribute for the change to take effect.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 .../processor_thermal_soc_slider.c            | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_soc_slider.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_soc_slider.c
index c492ee937dc7..ffc538c9b9e3 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_soc_slider.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_soc_slider.c
@@ -50,6 +50,43 @@ static u8 slider_values[] = {
 	[SOC_POWER_SLIDER_POWERSAVE] = SOC_SLIDER_VALUE_MAXIMUM,
 };
 
+/* Lock to protect module param updates */
+static DEFINE_MUTEX(slider_param_lock);
+
+static int slider_balanced_param = SOC_SLIDER_VALUE_BALANCE;
+
+static int slider_def_balance_set(const char *arg, const struct kernel_param *kp)
+{
+	u8 slider_val;
+	int ret;
+
+	guard(mutex)(&slider_param_lock);
+
+	ret = kstrtou8(arg, 16, &slider_val);
+	if (!ret) {
+		if (slider_val > SOC_SLIDER_VALUE_MAXIMUM)
+			return -EINVAL;
+
+		slider_balanced_param = slider_val;
+	}
+
+	return ret;
+}
+
+static int slider_def_balance_get(char *buf, const struct kernel_param *kp)
+{
+	guard(mutex)(&slider_param_lock);
+	return sysfs_emit(buf, "%02x\n", slider_values[SOC_POWER_SLIDER_BALANCE]);
+}
+
+static const struct kernel_param_ops slider_def_balance_ops = {
+	.set = slider_def_balance_set,
+	.get = slider_def_balance_get,
+};
+
+module_param_cb(slider_balance, &slider_def_balance_ops, NULL, 0644);
+MODULE_PARM_DESC(slider_balance, "Set slider default value for balance.");
+
 /* Convert from platform power profile option to SoC slider value */
 static int convert_profile_to_power_slider(enum platform_profile_option profile)
 {
@@ -106,6 +143,10 @@ static int power_slider_platform_profile_set(struct device *dev,
 	if (!proc_priv)
 		return -EOPNOTSUPP;
 
+	guard(mutex)(&slider_param_lock);
+
+	slider_values[SOC_POWER_SLIDER_BALANCE] = slider_balanced_param;
+
 	slider = convert_profile_to_power_slider(profile);
 	if (slider < 0)
 		return slider;
-- 
2.43.0