[PATCH v3 1/2] hwmon: (nct6775) Directly call ASUS ACPI WMI method

[PATCH v3 1/2] hwmon: (nct6775) Directly call ASUS ACPI WMI method

[Denis Pauk]

New ASUS B650/B660/X670 boards firmware have not exposed WMI monitoring
GUID  and entrypoint method WMBD could be implemented for different device
UID.

Implement the direct call to entrypoint method for monitoring the device
UID of B550/X570 boards.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Co-developed-by: Ahmad Khalifa <ahmad@khalifa.ws>
Signed-off-by: Ahmad Khalifa <ahmad@khalifa.ws>
---
Changes:
v1:
  Rename each_port_arg to each_device_arg
  Rename nct6775_find_asus_acpi to nct6775_asuswmi_device_match
  Remove unrequired return -EEXIST, and iterate whole list of devices
  Make asus_acpi_dev static
v2:
  Restore break iteration logic in nct6775_asuswmi_device_match
  Add config check if ACPI disabled and acpi_device_* are undefined
  Pass device_id as data parameter of acpi_bus_for_each_dev

>> Also, the use of a static variable makes me wonder: would asus_acpi_dev
   be the same for both chips if there are two Super-IO chips in the system ?

Available B550/X570/B650/B660/X670 firmwares have contained only one device 
with WMBD method and provided proxy only to 0x0270 port. Difference between 
board generation is only in name of the such device.

 drivers/hwmon/Kconfig            |  2 +-
 drivers/hwmon/nct6775-platform.c | 97 ++++++++++++++++++++++----------
 2 files changed, 69 insertions(+), 30 deletions(-)

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 3176c33af6c6..300ce8115ce4 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1516,7 +1516,7 @@ config SENSORS_NCT6775_CORE
 config SENSORS_NCT6775
 	tristate "Platform driver for Nuvoton NCT6775F and compatibles"
 	depends on !PPC
-	depends on ACPI_WMI || ACPI_WMI=n
+	depends on ACPI || ACPI=n
 	select HWMON_VID
 	select SENSORS_NCT6775_CORE
 	help
diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
index bf43f73dc835..082f48785999 100644
--- a/drivers/hwmon/nct6775-platform.c
+++ b/drivers/hwmon/nct6775-platform.c
@@ -17,7 +17,6 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
-#include <linux/wmi.h>
 
 #include "nct6775.h"
 
@@ -107,40 +106,48 @@ struct nct6775_sio_data {
 	void (*sio_exit)(struct nct6775_sio_data *sio_data);
 };
 
-#define ASUSWMI_MONITORING_GUID		"466747A0-70EC-11DE-8A39-0800200C9A66"
+#define ASUSWMI_METHOD			"WMBD"
 #define ASUSWMI_METHODID_RSIO		0x5253494F
 #define ASUSWMI_METHODID_WSIO		0x5753494F
 #define ASUSWMI_METHODID_RHWM		0x5248574D
 #define ASUSWMI_METHODID_WHWM		0x5748574D
 #define ASUSWMI_UNSUPPORTED_METHOD	0xFFFFFFFE
+#define ASUSWMI_DEVICE_HID		"PNP0C14"
+#define ASUSWMI_DEVICE_UID		"ASUSWMI"
+
+/*
+ * ASUS boards have only one device with WMI "WMBD" method and have provided
+ * access to only one SuperIO chip at 0x0290.
+ */
+static struct acpi_device *asus_acpi_dev;
 
 static int nct6775_asuswmi_evaluate_method(u32 method_id, u8 bank, u8 reg, u8 val, u32 *retval)
 {
-#if IS_ENABLED(CONFIG_ACPI_WMI)
+#if IS_ENABLED(CONFIG_ACPI)
+	acpi_handle handle = acpi_device_handle(asus_acpi_dev);
 	u32 args = bank | (reg << 8) | (val << 16);
-	struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
-	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_object_list input;
+	union acpi_object params[3];
+	unsigned long long result;
 	acpi_status status;
-	union acpi_object *obj;
-	u32 tmp = ASUSWMI_UNSUPPORTED_METHOD;
-
-	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
-				     method_id, &input, &output);
 
+	params[0].type = ACPI_TYPE_INTEGER;
+	params[0].integer.value = 0;
+	params[1].type = ACPI_TYPE_INTEGER;
+	params[1].integer.value = method_id;
+	params[2].type = ACPI_TYPE_BUFFER;
+	params[2].buffer.length = sizeof(args);
+	params[2].buffer.pointer = (void *)&args;
+	input.count = 3;
+	input.pointer = params;
+
+	status = acpi_evaluate_integer(handle, ASUSWMI_METHOD, &input, &result);
 	if (ACPI_FAILURE(status))
 		return -EIO;
 
-	obj = output.pointer;
-	if (obj && obj->type == ACPI_TYPE_INTEGER)
-		tmp = obj->integer.value;
-
 	if (retval)
-		*retval = tmp;
-
-	kfree(obj);
+		*retval = (u32)result & 0xFFFFFFFF;
 
-	if (tmp == ASUSWMI_UNSUPPORTED_METHOD)
-		return -ENODEV;
 	return 0;
 #else
 	return -EOPNOTSUPP;
@@ -1099,6 +1106,46 @@ static const char * const asus_wmi_boards[] = {
 	"TUF GAMING Z490-PLUS (WI-FI)",
 };
 
+#if IS_ENABLED(CONFIG_ACPI)
+/*
+ * Callback for acpi_bus_for_each_dev() to find the right device
+ * by _UID and _HID and return 1 to stop iteration.
+ */
+static int nct6775_asuswmi_device_match(struct device *dev, void *data)
+{
+	struct acpi_device *adev = to_acpi_device(dev);
+	const char *uid = acpi_device_uid(adev);
+	const char *hid = acpi_device_hid(adev);
+
+	if (hid && !strcmp(hid, ASUSWMI_DEVICE_HID) &&
+		uid && !strcmp(uid, data)) {
+		asus_acpi_dev = adev;
+		return 1;
+	}
+
+	return 0;
+}
+#endif
+
+static enum sensor_access nct6775_determine_access(const char *device_uid)
+{
+#if IS_ENABLED(CONFIG_ACPI)
+	u8 tmp;
+
+	acpi_bus_for_each_dev(nct6775_asuswmi_device_match, (void *)device_uid);
+	if (!asus_acpi_dev)
+		return access_direct;
+
+	/* if reading chip id via ACPI succeeds, use WMI "WMBD" method for access */
+	if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp) && tmp) {
+		pr_debug("Using Asus WMBD method of %s to access %#x chip.\n", device_uid, tmp);
+		return access_asuswmi;
+	}
+#endif
+
+	return access_direct;
+}
+
 static int __init sensors_nct6775_platform_init(void)
 {
 	int i, err;
@@ -1109,7 +1156,6 @@ static int __init sensors_nct6775_platform_init(void)
 	int sioaddr[2] = { 0x2e, 0x4e };
 	enum sensor_access access = access_direct;
 	const char *board_vendor, *board_name;
-	u8 tmp;
 
 	err = platform_driver_register(&nct6775_driver);
 	if (err)
@@ -1122,15 +1168,8 @@ static int __init sensors_nct6775_platform_init(void)
 	    !strcmp(board_vendor, "ASUSTeK COMPUTER INC.")) {
 		err = match_string(asus_wmi_boards, ARRAY_SIZE(asus_wmi_boards),
 				   board_name);
-		if (err >= 0) {
-			/* if reading chip id via WMI succeeds, use WMI */
-			if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp) && tmp) {
-				pr_info("Using Asus WMI to access %#x chip.\n", tmp);
-				access = access_asuswmi;
-			} else {
-				pr_err("Can't read ChipID by Asus WMI.\n");
-			}
-		}
+		if (err >= 0)
+			access = nct6775_determine_access(ASUSWMI_DEVICE_UID);
 	}
 
 	/*

base-commit: b0587c87abc891e313d63946ff8c9f4939d1ea1a
-- 
2.39.0

[PATCH v3 2/2] hwmon: (nct6775) B650/B660/X670 ASUS boards support

[Denis Pauk]

Boards such as:
  "EX-B660M-V5 PRO D4",
  "PRIME B650-PLUS",
  "PRIME B650M-A",
  "PRIME B650M-A AX",
  "PRIME B650M-A II",
  "PRIME B650M-A WIFI",
  "PRIME B650M-A WIFI II",
  "PRIME B660M-A D4",
  "PRIME B660M-A WIFI D4",
  "PRIME X670-P",
  "PRIME X670-P WIFI",
  "PRIME X670E-PRO WIFI",
  "Pro B660M-C-D4",
  "ProArt B660-CREATOR D4",
  "ProArt X670E-CREATOR WIFI",
  "ROG CROSSHAIR X670E EXTREME",
  "ROG CROSSHAIR X670E GENE",
  "ROG CROSSHAIR X670E HERO",
  "ROG MAXIMUS XIII EXTREME GLACIAL",
  "ROG MAXIMUS Z690 EXTREME",
  "ROG MAXIMUS Z690 EXTREME GLACIAL",
  "ROG STRIX B650-A GAMING WIFI",
  "ROG STRIX B650E-E GAMING WIFI",
  "ROG STRIX B650E-F GAMING WIFI",
  "ROG STRIX B650E-I GAMING WIFI",
  "ROG STRIX B660-A GAMING WIFI D4",
  "ROG STRIX B660-F GAMING WIFI",
  "ROG STRIX B660-G GAMING WIFI",
  "ROG STRIX B660-I GAMING WIFI",
  "ROG STRIX X670E-A GAMING WIFI",
  "ROG STRIX X670E-E GAMING WIFI",
  "ROG STRIX X670E-F GAMING WIFI",
  "ROG STRIX X670E-I GAMING WIFI",
  "ROG STRIX Z590-A GAMING WIFI II",
  "ROG STRIX Z690-A GAMING WIFI D4",
  "TUF GAMING B650-PLUS",
  "TUF GAMING B650-PLUS WIFI",
  "TUF GAMING B650M-PLUS",
  "TUF GAMING B650M-PLUS WIFI",
  "TUF GAMING B660M-PLUS WIFI",
  "TUF GAMING X670E-PLUS",
  "TUF GAMING X670E-PLUS WIFI",
  "TUF GAMING Z590-PLUS WIFI",
have got a nct6775 chip, but by default there's no use of it
because of resource conflict with WMI method.

This commit adds such boards to the monitoring list with new ACPI device
UID.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Co-developed-by: Ahmad Khalifa <ahmad@khalifa.ws>
Signed-off-by: Ahmad Khalifa <ahmad@khalifa.ws>
Tested-by: Jeroen Beerstra <jeroen@beerstra.org>
Tested-by: Slawomir Stepien <sst@poczta.fm>
---
Changes:
v1: no changes
v2: no changes

 drivers/hwmon/nct6775-platform.c | 52 ++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
index 082f48785999..e7412ce3fab9 100644
--- a/drivers/hwmon/nct6775-platform.c
+++ b/drivers/hwmon/nct6775-platform.c
@@ -114,6 +114,7 @@ struct nct6775_sio_data {
 #define ASUSWMI_UNSUPPORTED_METHOD	0xFFFFFFFE
 #define ASUSWMI_DEVICE_HID		"PNP0C14"
 #define ASUSWMI_DEVICE_UID		"ASUSWMI"
+#define ASUSMSI_DEVICE_UID		"AsusMbSwInterface"
 
 /*
  * ASUS boards have only one device with WMI "WMBD" method and have provided
@@ -1106,6 +1107,52 @@ static const char * const asus_wmi_boards[] = {
 	"TUF GAMING Z490-PLUS (WI-FI)",
 };
 
+static const char * const asus_msi_boards[] = {
+	"EX-B660M-V5 PRO D4",
+	"PRIME B650-PLUS",
+	"PRIME B650M-A",
+	"PRIME B650M-A AX",
+	"PRIME B650M-A II",
+	"PRIME B650M-A WIFI",
+	"PRIME B650M-A WIFI II",
+	"PRIME B660M-A D4",
+	"PRIME B660M-A WIFI D4",
+	"PRIME X670-P",
+	"PRIME X670-P WIFI",
+	"PRIME X670E-PRO WIFI",
+	"Pro B660M-C-D4",
+	"ProArt B660-CREATOR D4",
+	"ProArt X670E-CREATOR WIFI",
+	"ROG CROSSHAIR X670E EXTREME",
+	"ROG CROSSHAIR X670E GENE",
+	"ROG CROSSHAIR X670E HERO",
+	"ROG MAXIMUS XIII EXTREME GLACIAL",
+	"ROG MAXIMUS Z690 EXTREME",
+	"ROG MAXIMUS Z690 EXTREME GLACIAL",
+	"ROG STRIX B650-A GAMING WIFI",
+	"ROG STRIX B650E-E GAMING WIFI",
+	"ROG STRIX B650E-F GAMING WIFI",
+	"ROG STRIX B650E-I GAMING WIFI",
+	"ROG STRIX B660-A GAMING WIFI D4",
+	"ROG STRIX B660-F GAMING WIFI",
+	"ROG STRIX B660-G GAMING WIFI",
+	"ROG STRIX B660-I GAMING WIFI",
+	"ROG STRIX X670E-A GAMING WIFI",
+	"ROG STRIX X670E-E GAMING WIFI",
+	"ROG STRIX X670E-F GAMING WIFI",
+	"ROG STRIX X670E-I GAMING WIFI",
+	"ROG STRIX Z590-A GAMING WIFI II",
+	"ROG STRIX Z690-A GAMING WIFI D4",
+	"TUF GAMING B650-PLUS",
+	"TUF GAMING B650-PLUS WIFI",
+	"TUF GAMING B650M-PLUS",
+	"TUF GAMING B650M-PLUS WIFI",
+	"TUF GAMING B660M-PLUS WIFI",
+	"TUF GAMING X670E-PLUS",
+	"TUF GAMING X670E-PLUS WIFI",
+	"TUF GAMING Z590-PLUS WIFI",
+};
+
 #if IS_ENABLED(CONFIG_ACPI)
 /*
  * Callback for acpi_bus_for_each_dev() to find the right device
@@ -1170,6 +1217,11 @@ static int __init sensors_nct6775_platform_init(void)
 				   board_name);
 		if (err >= 0)
 			access = nct6775_determine_access(ASUSWMI_DEVICE_UID);
+
+		err = match_string(asus_msi_boards, ARRAY_SIZE(asus_msi_boards),
+				   board_name);
+		if (err >= 0)
+			access = nct6775_determine_access(ASUSMSI_DEVICE_UID);
 	}
 
 	/*
-- 
2.39.0

Re: [PATCH v3 1/2] hwmon: (nct6775) Directly call ASUS ACPI WMI method

[Guenter Roeck]

On 1/10/23 14:48, Denis Pauk wrote:
> New ASUS B650/B660/X670 boards firmware have not exposed WMI monitoring
> GUID  and entrypoint method WMBD could be implemented for different device
> UID.
> 
> Implement the direct call to entrypoint method for monitoring the device
> UID of B550/X570 boards.
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
> Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
> Co-developed-by: Ahmad Khalifa <ahmad@khalifa.ws>
> Signed-off-by: Ahmad Khalifa <ahmad@khalifa.ws>
> ---
> Changes:
> v1:
>    Rename each_port_arg to each_device_arg
>    Rename nct6775_find_asus_acpi to nct6775_asuswmi_device_match
>    Remove unrequired return -EEXIST, and iterate whole list of devices
>    Make asus_acpi_dev static
> v2:
>    Restore break iteration logic in nct6775_asuswmi_device_match
>    Add config check if ACPI disabled and acpi_device_* are undefined
>    Pass device_id as data parameter of acpi_bus_for_each_dev
> 
>>> Also, the use of a static variable makes me wonder: would asus_acpi_dev
>     be the same for both chips if there are two Super-IO chips in the system ?
> 
> Available B550/X570/B650/B660/X670 firmwares have contained only one device
> with WMBD method and provided proxy only to 0x0270 port. Difference between
> board generation is only in name of the such device.
> 
>   drivers/hwmon/Kconfig            |  2 +-
>   drivers/hwmon/nct6775-platform.c | 97 ++++++++++++++++++++++----------
>   2 files changed, 69 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 3176c33af6c6..300ce8115ce4 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1516,7 +1516,7 @@ config SENSORS_NCT6775_CORE
>   config SENSORS_NCT6775
>   	tristate "Platform driver for Nuvoton NCT6775F and compatibles"
>   	depends on !PPC
> -	depends on ACPI_WMI || ACPI_WMI=n
> +	depends on ACPI || ACPI=n
>   	select HWMON_VID
>   	select SENSORS_NCT6775_CORE
>   	help
> diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
> index bf43f73dc835..082f48785999 100644
> --- a/drivers/hwmon/nct6775-platform.c
> +++ b/drivers/hwmon/nct6775-platform.c
> @@ -17,7 +17,6 @@
>   #include <linux/module.h>
>   #include <linux/platform_device.h>
>   #include <linux/regmap.h>
> -#include <linux/wmi.h>

0-day reported various errors. I suspect those are seen with CONFIG_ACPI=n.
Have you tried the build reported as problematic ?

I get

drivers/hwmon/nct6775-platform.c:122:28: error: ‘asus_acpi_dev’ defined but not used [-Werror=unused-variable]
   122 | static struct acpi_device *asus_acpi_dev;

if I try to build nct6775-platform.o with W=1 and CONFIG_ACPI=n.

Overall the #ifdefs in the driver get a bit out of hand. I think it
may be time to consolidate that. Not necessarily now, but sometime soon.

Guenter

>   
>   #include "nct6775.h"
>   
> @@ -107,40 +106,48 @@ struct nct6775_sio_data {
>   	void (*sio_exit)(struct nct6775_sio_data *sio_data);
>   };
>   
> -#define ASUSWMI_MONITORING_GUID		"466747A0-70EC-11DE-8A39-0800200C9A66"
> +#define ASUSWMI_METHOD			"WMBD"
>   #define ASUSWMI_METHODID_RSIO		0x5253494F
>   #define ASUSWMI_METHODID_WSIO		0x5753494F
>   #define ASUSWMI_METHODID_RHWM		0x5248574D
>   #define ASUSWMI_METHODID_WHWM		0x5748574D
>   #define ASUSWMI_UNSUPPORTED_METHOD	0xFFFFFFFE
> +#define ASUSWMI_DEVICE_HID		"PNP0C14"
> +#define ASUSWMI_DEVICE_UID		"ASUSWMI"
> +
> +/*
> + * ASUS boards have only one device with WMI "WMBD" method and have provided
> + * access to only one SuperIO chip at 0x0290.
> + */
> +static struct acpi_device *asus_acpi_dev;
>   
>   static int nct6775_asuswmi_evaluate_method(u32 method_id, u8 bank, u8 reg, u8 val, u32 *retval)
>   {
> -#if IS_ENABLED(CONFIG_ACPI_WMI)
> +#if IS_ENABLED(CONFIG_ACPI)
> +	acpi_handle handle = acpi_device_handle(asus_acpi_dev);
>   	u32 args = bank | (reg << 8) | (val << 16);
> -	struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
> -	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	struct acpi_object_list input;
> +	union acpi_object params[3];
> +	unsigned long long result;
>   	acpi_status status;
> -	union acpi_object *obj;
> -	u32 tmp = ASUSWMI_UNSUPPORTED_METHOD;
> -
> -	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
> -				     method_id, &input, &output);
>   
> +	params[0].type = ACPI_TYPE_INTEGER;
> +	params[0].integer.value = 0;
> +	params[1].type = ACPI_TYPE_INTEGER;
> +	params[1].integer.value = method_id;
> +	params[2].type = ACPI_TYPE_BUFFER;
> +	params[2].buffer.length = sizeof(args);
> +	params[2].buffer.pointer = (void *)&args;
> +	input.count = 3;
> +	input.pointer = params;
> +
> +	status = acpi_evaluate_integer(handle, ASUSWMI_METHOD, &input, &result);
>   	if (ACPI_FAILURE(status))
>   		return -EIO;
>   
> -	obj = output.pointer;
> -	if (obj && obj->type == ACPI_TYPE_INTEGER)
> -		tmp = obj->integer.value;
> -
>   	if (retval)
> -		*retval = tmp;
> -
> -	kfree(obj);
> +		*retval = (u32)result & 0xFFFFFFFF;
>   
> -	if (tmp == ASUSWMI_UNSUPPORTED_METHOD)
> -		return -ENODEV;
>   	return 0;
>   #else
>   	return -EOPNOTSUPP;
> @@ -1099,6 +1106,46 @@ static const char * const asus_wmi_boards[] = {
>   	"TUF GAMING Z490-PLUS (WI-FI)",
>   };
>   
> +#if IS_ENABLED(CONFIG_ACPI)
> +/*
> + * Callback for acpi_bus_for_each_dev() to find the right device
> + * by _UID and _HID and return 1 to stop iteration.
> + */
> +static int nct6775_asuswmi_device_match(struct device *dev, void *data)
> +{
> +	struct acpi_device *adev = to_acpi_device(dev);
> +	const char *uid = acpi_device_uid(adev);
> +	const char *hid = acpi_device_hid(adev);
> +
> +	if (hid && !strcmp(hid, ASUSWMI_DEVICE_HID) &&
> +		uid && !strcmp(uid, data)) {
> +		asus_acpi_dev = adev;
> +		return 1;
> +	}
> +
> +	return 0;
> +}
> +#endif
> +
> +static enum sensor_access nct6775_determine_access(const char *device_uid)
> +{
> +#if IS_ENABLED(CONFIG_ACPI)
> +	u8 tmp;
> +
> +	acpi_bus_for_each_dev(nct6775_asuswmi_device_match, (void *)device_uid);
> +	if (!asus_acpi_dev)
> +		return access_direct;
> +
> +	/* if reading chip id via ACPI succeeds, use WMI "WMBD" method for access */
> +	if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp) && tmp) {
> +		pr_debug("Using Asus WMBD method of %s to access %#x chip.\n", device_uid, tmp);
> +		return access_asuswmi;
> +	}
> +#endif
> +
> +	return access_direct;
> +}
> +
>   static int __init sensors_nct6775_platform_init(void)
>   {
>   	int i, err;
> @@ -1109,7 +1156,6 @@ static int __init sensors_nct6775_platform_init(void)
>   	int sioaddr[2] = { 0x2e, 0x4e };
>   	enum sensor_access access = access_direct;
>   	const char *board_vendor, *board_name;
> -	u8 tmp;
>   
>   	err = platform_driver_register(&nct6775_driver);
>   	if (err)
> @@ -1122,15 +1168,8 @@ static int __init sensors_nct6775_platform_init(void)
>   	    !strcmp(board_vendor, "ASUSTeK COMPUTER INC.")) {
>   		err = match_string(asus_wmi_boards, ARRAY_SIZE(asus_wmi_boards),
>   				   board_name);
> -		if (err >= 0) {
> -			/* if reading chip id via WMI succeeds, use WMI */
> -			if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp) && tmp) {
> -				pr_info("Using Asus WMI to access %#x chip.\n", tmp);
> -				access = access_asuswmi;
> -			} else {
> -				pr_err("Can't read ChipID by Asus WMI.\n");
> -			}
> -		}
> +		if (err >= 0)
> +			access = nct6775_determine_access(ASUSWMI_DEVICE_UID);
>   	}
>   
>   	/*
> 
> base-commit: b0587c87abc891e313d63946ff8c9f4939d1ea1a