Date:   Fri, 27 Aug 2021 15:26:11 +0000
From:   Barnabás Pőcze <pobrn@...tonmail.com>
To:     "Luke D. Jones" <luke@...nes.dev>
Cc:     linux-kernel@...r.kernel.org, hdegoede@...hat.com,
        hadess@...ess.net, platform-driver-x86@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v5] asus-wmi: Add support for custom fan curves

Hi


+CC Guenter Roeck as he may be able to tell us if there's an established
way to export fan curves.

I have added a couple comments.
There are places where spaces are used instead of tabs.


2021. augusztus 27., péntek 1:42 keltezéssel, Luke D. Jones írta:
> Add support for custom fan curves found on some ASUS ROG laptops.
>
> These laptops have the ability to set a custom curve for the CPU
> and GPU fans via an ACPI method call. This patch enables this,
> additionally enabling custom fan curves per-profile, where profile
> here means each of the 3 levels of "throttle_thermal_policy".
>
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
>  drivers/platform/x86/asus-wmi.c            | 616 ++++++++++++++++++++-
>  include/linux/platform_data/x86/asus-wmi.h |   2 +
>  2 files changed, 616 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index cc5811844012..944644ae0acd 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -108,6 +108,11 @@ module_param(fnlock_default, bool, 0444);
>
>  static const char * const ashs_ids[] = { "ATK4001", "ATK4002", NULL };
>
> +static int throttle_thermal_policy_write(struct asus_wmi*);
> +static ssize_t fan_curve_store(struct asus_wmi *asus, const char *buf,
> +								size_t count, u32 dev, char **curve,
> +								char *default_curve);
> +
>  static bool ashs_present(void)
>  {
>  	int i = 0;
> @@ -122,7 +127,8 @@ struct bios_args {
>  	u32 arg0;
>  	u32 arg1;
>  	u32 arg2; /* At least TUF Gaming series uses 3 dword input buffer. */
> -	u32 arg4;
> +	u32 arg3;
> +	u32 arg4; /* Some ROG laptops require a full 5 input args */
>  	u32 arg5;
>  } __packed;
>
> @@ -173,6 +179,21 @@ enum fan_type {
>  	FAN_TYPE_SPEC83,	/* starting in Spec 8.3, use CPU_FAN_CTRL */
>  };
>
> +struct fan_curve {
> +	char *balanced;
> +	char *balanced_default;
> +	char *performance;
> +	char *performance_default;
> +	char *quiet;
> +	char *quiet_default;
> +};
> +
> +struct enabled_fan_curves {
> +	bool balanced;
> +	bool performance;
> +	bool quiet;
> +};
> +
>  struct asus_wmi {
>  	int dsts_id;
>  	int spec;
> @@ -220,6 +241,14 @@ struct asus_wmi {
>  	bool throttle_thermal_policy_available;
>  	u8 throttle_thermal_policy_mode;
>
> +	bool cpu_fan_curve_available;
> +	struct fan_curve cpu_fan_curve;
> +
> +    bool gpu_fan_curve_available;
> +	struct fan_curve gpu_fan_curve;
> +
> +	struct enabled_fan_curves enabled_fan_curve_profiles;

I would suggest something like the following:

  struct fan_curve {
    /* bool enabled; */
    u8 temps[FAN_CURVE_SIZE];
    u8 percents[FAN_CURVE_SIZE];
  };

  struct fan {
    bool available;
    struct fan_curve curves[NUM_PERF_PROFILES];
  };

  struct asus_wmi {
    ...

    struct fan fans[NUM_FANS];

    bool fan_curve_enabled_for_profile[NUM_PERF_PROFILES];
    /* or maybe you could add it as `bool enabled;` into the inner struct */
  };

see the reason later.


> +
>  	struct platform_profile_handler platform_profile_handler;
>  	bool platform_profile_support;
>
> @@ -285,6 +314,85 @@ int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1, u32 *retval)
>  }
>  EXPORT_SYMBOL_GPL(asus_wmi_evaluate_method);
>
> +static int asus_wmi_evaluate_method5(u32 method_id,
> +		u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4, u32 *retval)
> +{
> +	struct bios_args args = {
> +		.arg0 = arg0,
> +		.arg1 = arg1,
> +		.arg2 = arg2,
> +		.arg3 = arg3,
> +		.arg4 = arg4,
> +	};
> +	struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	acpi_status status;
> +	union acpi_object *obj;
> +	u32 tmp = 0;
> +
> +	status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 0, method_id,
> +				     &input, &output);
> +
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	obj = (union acpi_object *)output.pointer;

Small thing, but this cast is unnecessary.


> +	if (obj && obj->type == ACPI_TYPE_INTEGER)
> +		tmp = (u32) obj->integer.value;

Same here.


> +
> +	if (retval)
> +		*retval = tmp;
> +
> +	kfree(obj);
> +
> +	if (tmp == ASUS_WMI_UNSUPPORTED_METHOD)
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
> +/*
> + * Returns as an error if the method output is not a buffer. Typically this
> + * means that the method called is unsupported.
> +*/
> +static int asus_wmi_evaluate_method_buf(u32 method_id,
> +		u32 arg0, u32 arg1, u8 *ret_buffer)
> +{
> +	struct bios_args args = {
> +		.arg0 = arg0,
> +		.arg1 = arg1,
> +		.arg2 = 0,
> +	};
> +	struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	acpi_status status;
> +	union acpi_object *obj;
> +	u32 int_tmp = 0;
> +
> +	status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 0, method_id,
> +				     &input, &output);
> +
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	obj = (union acpi_object *)output.pointer;
> +
> +	if (obj && obj->type == ACPI_TYPE_INTEGER) {
> +		int_tmp = (u32) obj->integer.value;
> +		if (int_tmp == ASUS_WMI_UNSUPPORTED_METHOD)
> +			return -ENODEV;
> +		return int_tmp;
> +	}
> +
> +	if (obj && obj->type == ACPI_TYPE_BUFFER) {
> +		memcpy(ret_buffer, obj->buffer.pointer, obj->buffer.length);
> +	}
> +
> +	kfree(obj);
> +
> +	return 0;
> +}
> +
>  static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
>  {
>  	struct acpi_buffer input;
> @@ -1813,7 +1921,7 @@ static ssize_t fan1_label_show(struct device *dev,
>  					  struct device_attribute *attr,
>  					  char *buf)
>  {
> -	return sprintf(buf, "%s\n", ASUS_FAN_DESC);
> +	return sprintf(buf, "%s", ASUS_FAN_DESC);

What is the reason for this change?


>  }
>
>  static ssize_t asus_hwmon_temp1(struct device *dev,
> @@ -2043,6 +2151,458 @@ static ssize_t fan_boost_mode_store(struct device *dev,
>  // Fan boost mode: 0 - normal, 1 - overboost, 2 - silent
>  static DEVICE_ATTR_RW(fan_boost_mode);
>
> +/* Custom fan curves per-profile **********************************************/
> +
> +/*
> + * Check if the ability to set fan curves on either fan exists, and store the
> + * defaults for recall later plus to provide users with a starting point.
> + *
> + * "dev" is either CPU_FAN_CURVE or GPU_FAN_CURVE.
> +*/
> +static int custom_fan_check_present(struct asus_wmi *asus,
> +									bool *available, u32 dev)
> +{
> +	struct fan_curve *curves = &asus->cpu_fan_curve;
> +	u8 *buf = kzalloc(16 * sizeof(u8), GFP_KERNEL);

Is dynamic allocation needed here? No early return frees it.


> +	/* 15 punctuation marks + 16 sets of numbers up to 3 char each */
> +	int str_len = 15 + 16 * 3;

It appears to me that the terminating null byte is not accounted for. E.g.:

  255:255,255:255,255:255,255:255,255:255,255:255,255:255,255:255

is itself already 63 (= 15 + 16 x 3) characters.

And if the maximum length is known, and it's reasonably small, why is it not
part of the struct as a char array? E.g.:

  struct fan_curve {
    char balanced[FAN_CURVE_STR_SIZE]; /* #define FAN_CURVE_STR_SIZE 64 */
    ...
  };

I would actually suggest storing the u8 array itself in the fan curve struct,
and not a string representation of it. I think the data is easier to deal with
that way, and the price of formatting it for the sysfs attribute is not
significant.


> +	int err;
> +
> +	*available = false;
> +
> +	if (dev == ASUS_WMI_DEVID_GPU_FAN_CURVE)
> +		curves = &asus->gpu_fan_curve;
> +
> +	/* Balanced default */
> +	err = asus_wmi_evaluate_method_buf(asus->dsts_id, dev, 0, buf);
> +	if (err) {
> +		if (err == -ENODEV)
> +			return 0;
> +		return err;
> +	}
> +
> +	curves->balanced = kzalloc(str_len * sizeof(char), GFP_KERNEL);
> +	if (!curves->balanced)
> +		return -ENOMEM;
> +
> +	curves->balanced_default = kzalloc(str_len * sizeof(char), GFP_KERNEL);
> +	if (!curves->balanced_default)
> +		return -ENOMEM;
> +
> +	sprintf(curves->balanced, "%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d",
> +		buf[0], buf[8], buf[1], buf[9], buf[2], buf[10], buf[3], buf[11],
> +		buf[4], buf[12], buf[5], buf[13], buf[6], buf[14], buf[7], buf[15]);
> +	sprintf(curves->balanced_default, curves->balanced);
> +
> +	/* Quiet default */
> +	err = asus_wmi_evaluate_method_buf(asus->dsts_id, dev, 1, buf);
> +	if (err) {
> +		if (err == -ENODEV)
> +			return 0;
> +		return err;
> +	}
> +
> +	curves->quiet = kzalloc(str_len * sizeof(char), GFP_KERNEL);
> +	if (!curves->quiet)
> +		return -ENOMEM;
> +
> +	curves->quiet_default = kzalloc(str_len * sizeof(char), GFP_KERNEL);
> +	if (!curves->quiet_default)
> +		return -ENOMEM;
> +
> +	sprintf(curves->quiet, "%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d",
> +		buf[0], buf[8], buf[1], buf[9], buf[2], buf[10], buf[3], buf[11],
> +		buf[4], buf[12], buf[5], buf[13], buf[6], buf[14], buf[7], buf[15]);
> +	sprintf(curves->quiet_default, curves->quiet);
> +
> +	/* Performance default */
> +	err = asus_wmi_evaluate_method_buf(asus->dsts_id, dev, 2, buf);
> +	if (err) {
> +		if (err == -ENODEV)
> +			return 0;
> +		return err;
> +	}
> +
> +	curves->performance = kzalloc(str_len * sizeof(char), GFP_KERNEL);
> +	if (!curves->performance)
> +		return -ENOMEM;
> +
> +	curves->performance_default = kzalloc(str_len * sizeof(char), GFP_KERNEL);
> +	if (!curves->performance_default)
> +		return -ENOMEM;
> +
> +	sprintf(curves->performance,
> +		"%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d,%d:%d",
> +		buf[0], buf[8], buf[1], buf[9], buf[2], buf[10], buf[3], buf[11],
> +		buf[4], buf[12], buf[5], buf[13], buf[6], buf[14], buf[7], buf[15]);
> +	sprintf(curves->performance_default, curves->performance);

More or less the same code is repeated three times, I'd consider adding an e.g.

  void fan_curve_to_str(..., char[static FAN_CURVE_STR_SIZE]);

function.


> +
> +	kfree(buf);
> +
> +	*available = true;
> +	return 0;
> +}
> +
> +/*
> + * The expected input is of the format
> + *     "30:1,49:2,59:3,69:4,79:31,89:49,99:56,109:58"
> + * where a pair is 30:1, with 30 = temperature, and 1 = percentage
> +*/
> +static int fan_curve_write(struct asus_wmi *asus, u32 dev, char *curve)
> +{
> +    char * buf, *set, *pair_tmp, *pair, *set_end, *pair_end;
> +    int err, ret;
> +
> +	char *set_delimiter = ",";
> +	char *pair_delimiter = ":";
> +	bool half_complete = false;
> +	bool pair_start = true;
> +	u32 prev_percent = 0;
> +	u32 prev_temp = 0;
> +	u32 percent = 0;
> +	u32 shift = 0;
> +	u32 temp = 0;
> +    u32 arg1 = 0;
> +    u32 arg2 = 0;
> +    u32 arg3 = 0;
> +    u32 arg4 = 0;
> +
> +    buf = set_end = pair_end = kstrdup(curve, GFP_KERNEL);
> +
> +	while( (set = strsep(&set_end, set_delimiter)) != NULL ) {
> +		pair_tmp = kstrdup(set, GFP_KERNEL);
> +        pair_start = true;
> +		while( (pair = strsep(&pair_tmp, pair_delimiter)) != NULL ) {
> +			err = kstrtouint(pair, 10, &ret);
> +            if (err) {
> +                kfree(pair_tmp);
> +                kfree(buf);
> +                return err;
> +            }
> +
> +            if (pair_start) {
> +                temp = ret;
> +                pair_start = false;
> +            } else {
> +                percent = ret;
> +            }
> +		}
> +		kfree(pair_tmp);
> +
> +		if (temp < prev_temp || percent < prev_percent || percent > 100) {
> +            pr_info("Fan curve invalid");
> +			pr_info("A value is sequentially lower or percentage is > 100");
> +            kfree(buf);
> +            return -EINVAL;
> +        }
> +
> +        prev_temp = temp;
> +        prev_percent = percent;
> +
> +        if (!half_complete) {
> +            arg1 += temp << shift;
> +            arg3 += percent << shift;
> +        } else {
> +            arg2 += temp << shift;
> +            arg4 += percent << shift;
> +        }

As far as I see using 64-bit integers would avoid the need for `half_complete`, et al.


> +        shift += 8;
> +
> +        if (shift == 32) {
> +            shift = 0;
> +            half_complete = true;
> +        }
> +	}
> +	kfree(buf);
> +

If you don't insist on using commas, I think it is much simpler to
parse it using `sscanf()`, e.g.:

  unsigned int temp, prct;
  int at = 0, len;

  while (sscanf(&buf[at], "%u:%u %n", &temp, &prct, &len) == 2) {
    /* process `temp` and `prct` */

    at += len;
  }

  if (buf[at] != '\0')
    /* error */;

This also has the advantage that you don't need dynamic memory allocation.


> +    return asus_wmi_evaluate_method5(ASUS_WMI_METHODID_DEVS, dev,
> +									 arg1, arg2, arg3, arg4, &ret);
> +}
> +
> +static int fan_curve_cpu_write(struct asus_wmi *asus)
> +{
> +	char *curve = NULL;
> +	int err, mode;
> +
> +	mode = asus->throttle_thermal_policy_mode;
> +
> +	if (mode == ASUS_THROTTLE_THERMAL_POLICY_DEFAULT
> +					&& asus->enabled_fan_curve_profiles.balanced) {
> +		curve = asus->cpu_fan_curve.balanced;
> +	} else if (mode == ASUS_THROTTLE_THERMAL_POLICY_OVERBOOST
> +					&& asus->enabled_fan_curve_profiles.performance) {
> +		curve = asus->cpu_fan_curve.performance;
> +	} else if (mode == ASUS_THROTTLE_THERMAL_POLICY_SILENT
> +					&& asus->enabled_fan_curve_profiles.quiet) {
> +		curve = asus->cpu_fan_curve.quiet;
> +	}
> +
> +	if (curve != NULL) {
> +		err = fan_curve_write(asus, ASUS_WMI_DEVID_CPU_FAN_CURVE, curve);
> +		if (err)
> +			return err;
> +	}
> +	return 0;
> +}
> +
> +
> +static int fan_curve_gpu_write(struct asus_wmi *asus)
> +{
> +	char *curve = NULL;
> +	int err, mode;
> +
> +	mode = asus->throttle_thermal_policy_mode;
> +
> +	if (mode == ASUS_THROTTLE_THERMAL_POLICY_DEFAULT
> +					&& asus->enabled_fan_curve_profiles.balanced) {
> +		curve = asus->gpu_fan_curve.balanced;
> +	} else if (mode == ASUS_THROTTLE_THERMAL_POLICY_OVERBOOST
> +					&& asus->enabled_fan_curve_profiles.performance) {
> +		curve = asus->gpu_fan_curve.performance;
> +	} else if (mode == ASUS_THROTTLE_THERMAL_POLICY_SILENT
> +					&& asus->enabled_fan_curve_profiles.quiet) {
> +		curve = asus->gpu_fan_curve.quiet;
> +	}
> +
> +	if (curve != NULL) {
> +		err = fan_curve_write(asus, ASUS_WMI_DEVID_GPU_FAN_CURVE, curve);
> +		if (err)
> +			return err;
> +	}
> +	return 0;
> +}
> +
> +static ssize_t fan_curve_store(struct asus_wmi *asus, const char *buf,
> +								size_t count, u32 dev, char **curve,
> +								char *default_curve)
> +{
> +    int err;
> +
> +	/* Allow a user to write "" or " " to erase a curve setting */
> +	if (strlen(buf) <= 1 || strcmp(buf, " \n") == 0) {
> +		kfree(*curve);
> +		*curve = kstrdup(default_curve, GFP_KERNEL);
> +		err = throttle_thermal_policy_write(asus);
> +		if (err)
> +			return err;
> +		return count;
> +	}
> +
> +	if (*curve)
> +		kfree(*curve);
> +    *curve = kstrdup(buf, GFP_KERNEL);
> +
> +	/* Maybe activate fan curve if in associated mode */
> +	err = throttle_thermal_policy_write(asus);
> +	if (err) {
> +		kfree(*curve);
> +		*curve = kstrdup(default_curve, GFP_KERNEL);
> +		return err;
> +	}
> +
> +    return count;
> +}
> +
> +/*
> + * CPU Fan Curves
> +*/
> +
> +static ssize_t cpu_fan_curve_balanced_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	return scnprintf(buf, PAGE_SIZE, "%s", asus->cpu_fan_curve.balanced);
> +}
> +
> +static ssize_t cpu_fan_curve_balanced_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +    return fan_curve_store(asus, buf, count, ASUS_WMI_DEVID_CPU_FAN_CURVE,
> +							&asus->cpu_fan_curve.balanced,
> +							asus->cpu_fan_curve.balanced_default);
> +}
> +
> +static DEVICE_ATTR_RW(cpu_fan_curve_balanced);
> +
> +static ssize_t cpu_fan_curve_performance_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	return scnprintf(buf, PAGE_SIZE, "%s", asus->cpu_fan_curve.performance);
> +}
> +
> +static ssize_t cpu_fan_curve_performance_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +    return fan_curve_store(asus, buf, count, ASUS_WMI_DEVID_CPU_FAN_CURVE,
> +							&asus->cpu_fan_curve.performance,
> +							asus->cpu_fan_curve.performance_default);
> +}
> +
> +static DEVICE_ATTR_RW(cpu_fan_curve_performance);
> +
> +static ssize_t cpu_fan_curve_quiet_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	return scnprintf(buf, PAGE_SIZE, "%s", asus->cpu_fan_curve.quiet);
> +}
> +
> +static ssize_t cpu_fan_curve_quiet_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +    return fan_curve_store(asus, buf, count, ASUS_WMI_DEVID_CPU_FAN_CURVE,
> +							&asus->cpu_fan_curve.quiet,
> +							asus->cpu_fan_curve.quiet_default);
> +}
> +
> +static DEVICE_ATTR_RW(cpu_fan_curve_quiet);
> +
> +/*
> + * GPU Fan Curves
> +*/
> +
> +static ssize_t gpu_fan_curve_balanced_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	return scnprintf(buf, PAGE_SIZE, "%s", asus->gpu_fan_curve.balanced);
> +}
> +
> +static ssize_t gpu_fan_curve_balanced_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +    return fan_curve_store(asus, buf, count, ASUS_WMI_DEVID_GPU_FAN_CURVE,
> +							&asus->gpu_fan_curve.balanced,
> +							asus->gpu_fan_curve.balanced_default);
> +}
> +
> +static DEVICE_ATTR_RW(gpu_fan_curve_balanced);
> +
> +static ssize_t gpu_fan_curve_performance_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	return scnprintf(buf, PAGE_SIZE, "%s", asus->gpu_fan_curve.performance);
> +}
> +
> +static ssize_t gpu_fan_curve_performance_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +    return fan_curve_store(asus, buf, count, ASUS_WMI_DEVID_GPU_FAN_CURVE,
> +							&asus->gpu_fan_curve.performance,
> +							asus->gpu_fan_curve.performance_default);
> +}
> +
> +static DEVICE_ATTR_RW(gpu_fan_curve_performance);
> +
> +static ssize_t gpu_fan_curve_quiet_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	return scnprintf(buf, PAGE_SIZE, "%s", asus->gpu_fan_curve.quiet);
> +}
> +
> +static ssize_t gpu_fan_curve_quiet_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +    return fan_curve_store(asus, buf, count, ASUS_WMI_DEVID_GPU_FAN_CURVE,
> +							&asus->gpu_fan_curve.quiet,
> +							asus->gpu_fan_curve.quiet_default);
> +}
> +
> +static DEVICE_ATTR_RW(gpu_fan_curve_quiet);

Even though it is a hwmon thing, I think `SENSOR_ATTR_2()` (from linux/hwmon-sysfs.h)
would be very useful here as you'd avoid creating n+1 functions, e.g:

  static ssize_t fan_curve_show(struct device *dev, struct device_attribute *attr, char *buf)
  {
    struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
    struct asus_wmi *asus = dev_get_drvdata(dev);

    /*
     * if you stored fan curves in an array, you could then access the fan
     * curve in `asus->fans[sattr->index].curves[sattr->nr]`
     * /
  }

  static SENSOR_DEVICE_ATTR_2(some_name1, 0644, fan_curve_show, fan_curve_store,
                              FAN_CPU /* index in the "fans" array */,
                              ASUS_THROTTLE_THERMAL_POLICY_SILENT /* index in the "curves" array */);


> +
> +/*
> + * Profiles with enabled fan curve setting
> +*/
> +
> +static int enabled_fan_curve_profiles_write(struct asus_wmi *asus,
> +											const char *names)
> +{
> +    char *buf, *set, *set_end;
> +    int err;
> +
> +    buf = set_end = kstrdup(names, GFP_KERNEL);
> +
> +	/* Reset before checking */
> +	asus->enabled_fan_curve_profiles.balanced = false;
> +	asus->enabled_fan_curve_profiles.quiet = false;
> +	asus->enabled_fan_curve_profiles.performance = false;
> +
> +	while( (set = strsep(&set_end, " ")) != NULL ) {
> +		if (set == NULL)

When is this possible?


> +			set = buf;
> +
> +		if (strcmp(set, "balanced") == 0
> +				|| strcmp(set, "balanced\n") == 0)
> +			asus->enabled_fan_curve_profiles.balanced = true;
> +
> +		if (strcmp(set, "quiet") == 0
> +				|| strcmp(set, "quiet\n") == 0)
> +			asus->enabled_fan_curve_profiles.quiet = true;
> +
> +		if (strcmp(set, "performance") == 0
> +				|| strcmp(set, "performance\n") == 0)
> +			asus->enabled_fan_curve_profiles.performance = true;

If you store the enabled curves in an array, and you have a list of profile names,
then `sysfs_match_string()`, will be very helpful here. You could do something like:

  int profile = sysfs_match_string(profile_names, set);
  if (profile < 0) {
    /* not found */
  }

  asus->fan_curve_enabled_for_profile[profile] = true;


> +	}
> +
> +	err = throttle_thermal_policy_write(asus);
> +	if (err)
> +		return err;
> +
> +	kfree(buf);
> +
> +	return 0;
> +}
> +
> +static ssize_t enabled_fan_curve_profiles_show(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	int len = 0;
> +
> +	if (asus->enabled_fan_curve_profiles.balanced)
> +		len += sysfs_emit_at(buf, len, "balanced ");
> +
> +	if (asus->enabled_fan_curve_profiles.performance)
> +		len += sysfs_emit_at(buf, len, "performance ");
> +
> +	if (asus->enabled_fan_curve_profiles.quiet)
> +		len += sysfs_emit_at(buf, len, "quiet ");
> +
> +	len += sysfs_emit_at(buf, len, "\n");
> +	return len;
> +}
> +
> +static ssize_t enabled_fan_curve_profiles_store(struct device *dev,
> +				    struct device_attribute *attr,
> +				    const char *buf, size_t count)
> +{
> +    struct asus_wmi *asus = dev_get_drvdata(dev);
> +	int err;
> +
> +	err = enabled_fan_curve_profiles_write(asus, buf);
> +	if (err)
> +		return err;
> +
> +    return count;
> +}
> +
> +static DEVICE_ATTR_RW(enabled_fan_curve_profiles);
> +
>  /* Throttle thermal policy ****************************************************/
>
>  static int throttle_thermal_policy_check_present(struct asus_wmi *asus)
> @@ -2092,6 +2652,26 @@ static int throttle_thermal_policy_write(struct asus_wmi *asus)
>  		return -EIO;
>  	}
>
> +	if (asus->cpu_fan_curve_available) {
> +		err = fan_curve_cpu_write(asus);
> +		if (err) {
> +			dev_warn(&asus->platform_device->dev,
> +				"Failed to set custom CPU curve for thermal policy: %d\n",
> +				err);
> +			return err;
> +		}
> +	}
> +
> +	if (asus->gpu_fan_curve_available) {
> +		err = fan_curve_gpu_write(asus);
> +		if (err) {
> +			dev_warn(&asus->platform_device->dev,
> +				"Failed to set custom GPU curve for thermal policy: %d\n",
> +				err);
> +			return err;
> +		}
> +	}
> +
>  	return 0;
>  }
>
> @@ -2711,6 +3291,13 @@ static struct attribute *platform_attributes[] = {
>  	&dev_attr_als_enable.attr,
>  	&dev_attr_fan_boost_mode.attr,
>  	&dev_attr_throttle_thermal_policy.attr,
> +	&dev_attr_cpu_fan_curve_balanced.attr,
> +	&dev_attr_cpu_fan_curve_performance.attr,
> +	&dev_attr_cpu_fan_curve_quiet.attr,
> +    &dev_attr_gpu_fan_curve_balanced.attr,
> +	&dev_attr_gpu_fan_curve_performance.attr,
> +	&dev_attr_gpu_fan_curve_quiet.attr,
> +	&dev_attr_enabled_fan_curve_profiles.attr,
>  	&dev_attr_panel_od.attr,
>  	NULL
>  };
> @@ -2741,6 +3328,20 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
>  		ok = asus->fan_boost_mode_available;
>  	else if (attr == &dev_attr_throttle_thermal_policy.attr)
>  		ok = asus->throttle_thermal_policy_available;
> +	else if (attr == &dev_attr_cpu_fan_curve_balanced.attr)
> +		ok = asus->cpu_fan_curve_available;
> +	else if (attr == &dev_attr_cpu_fan_curve_performance.attr)
> +		ok = asus->cpu_fan_curve_available;
> +	else if (attr == &dev_attr_cpu_fan_curve_quiet.attr)
> +		ok = asus->cpu_fan_curve_available;
> +    else if (attr == &dev_attr_gpu_fan_curve_balanced.attr)
> +		ok = asus->gpu_fan_curve_available;
> +	else if (attr == &dev_attr_gpu_fan_curve_performance.attr)
> +		ok = asus->gpu_fan_curve_available;
> +	else if (attr == &dev_attr_gpu_fan_curve_quiet.attr)
> +		ok = asus->gpu_fan_curve_available;
> +	else if (attr == &dev_attr_enabled_fan_curve_profiles.attr)
> +		ok = asus->cpu_fan_curve_available || asus->gpu_fan_curve_available;
>  	else if (attr == &dev_attr_panel_od.attr)
>  		ok = asus->panel_overdrive_available;
>
> @@ -3016,6 +3617,16 @@ static int asus_wmi_add(struct platform_device *pdev)
>  	else
>  		throttle_thermal_policy_set_default(asus);
>
> +	err = custom_fan_check_present(asus, &asus->cpu_fan_curve_available,
> +			ASUS_WMI_DEVID_CPU_FAN_CURVE);
> +	if (err)
> +		goto fail_custom_fan_curve;
> +
> +    err = custom_fan_check_present(asus, &asus->gpu_fan_curve_available,
> +			ASUS_WMI_DEVID_GPU_FAN_CURVE);
> +	if (err)
> +		goto fail_custom_fan_curve;
> +
>  	err = platform_profile_setup(asus);
>  	if (err)
>  		goto fail_platform_profile_setup;
> @@ -3109,6 +3720,7 @@ static int asus_wmi_add(struct platform_device *pdev)
>  	asus_wmi_sysfs_exit(asus->platform_device);
>  fail_sysfs:
>  fail_throttle_thermal_policy:
> +fail_custom_fan_curve:
>  fail_platform_profile_setup:
>  	if (asus->platform_profile_support)
>  		platform_profile_remove();
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 17dc5cb6f3f2..a571b47ff362 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -77,6 +77,8 @@
>  #define ASUS_WMI_DEVID_THERMAL_CTRL	0x00110011
>  #define ASUS_WMI_DEVID_FAN_CTRL		0x00110012 /* deprecated */
>  #define ASUS_WMI_DEVID_CPU_FAN_CTRL	0x00110013
> +#define ASUS_WMI_DEVID_CPU_FAN_CURVE	0x00110024
> +#define ASUS_WMI_DEVID_GPU_FAN_CURVE	0x00110025
>
>  /* Power */
>  #define ASUS_WMI_DEVID_PROCESSOR_STATE	0x00120012
> --
> 2.31.1


Best regards,
Barnabás Pőcze

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