[PATCH v8 0/3] Update ASUS WMI supported boards

[PATCH v8 0/3] Update ASUS WMI supported boards

[Denis Pauk]

Update ASUS WMI supported boards

Add support by WMI interface privided by Asus for B550/X570 boards: 
* PRIME X570-PRO,
* ROG CROSSHAIR VIII HERO
* ROG CROSSHAIR VIII DARK HERO
* ROG CROSSHAIR VIII FORMULA
* ROG STRIX X570-E GAMING
* ROG STRIX B550-E GAMING

Add support by WMI interface privided by Asus for X370/X470/
B450/X399 boards:
* ROG CROSSHAIR VI HERO,
* PRIME X399-A,
* PRIME X470-PRO,
* ROG CROSSHAIR VI EXTREME,
* ROG CROSSHAIR VI HERO (WI-FI AC),
* ROG CROSSHAIR VII HERO,
* ROG CROSSHAIR VII HERO (WI-FI),
* ROG STRIX B450-E GAMING,
* ROG STRIX B450-F GAMING,
* ROG STRIX B450-I GAMING,
* ROG STRIX X399-E GAMING,
* ROG STRIX X470-F GAMING,
* ROG STRIX X470-I GAMING,
* ROG ZENITH EXTREME,
* ROG ZENITH EXTREME ALPHA.

Add support to nct6775:
* ProArt X570-CREATOR WIFI.

Could you please review?

Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Signed-off-by: Ed Brindley <kernel@maidavale.org>
Signed-off-by: Eugene Shalygin <eugene.shalygin@gmail.com>

---
Changes in v8:
- Add seprate patch for ProArt X570-CREATOR WIFI support.
- Fix codestyle in defines and comments.
- Fix buffer length calculation.
- Use hex2bin/bin2hex for convert values in buffers.
- Remove unrequired acpi_os_free usage.
- Call mutex_lock inside of functions.

Changes in v7:
- Use  for directly get sensors list by board.
- Add depends on ACPI_WMI to Kconfig.
- Add response buffer size check in asus_wmi_ec_decode_reply_buffer.
- Clean up defines names.

Changes in v6:
- asus_wmi_ec_sensors: Generate query for all sensors on sensors setup
- asus_wmi_ec_sensors: Move binary to sensor value logic to separate 
  get_sensor_value (by Eugene Shalygin)
- asus_wmi_ec_sensors: Use acpi_os_free without NULL pointer check.
- Add asus_wmi_sensor to documentation index.
- Add asus_wmi_ec_sensor to documentation index.

Changes in v5:
- Fixes build issue reported by kernel test robot with disabled ACPI_WMI.
- asus_wmi_sensors: Remove sensor->name check as always evaluated to true.

Changes in v4:
 - Implement wmi driver instead platform driver.
 - Update documentation with known issues.

Changes in v3:
 - Use MODULE_DEVICE_TABLE for match devices.
 - asus_wmi_ec_sensors: Use get_unaligned_be32 instead incorrectly used 
   get_unaligned_le32.
 - Add documentaion for drivers.

Changes in v2:
 - asus_wmi_ec_sensors: Rename asus_wmi_sensors to asus_wmi_ec_sensors for 
   B550/X570 boards.
 - asus_wmi_ec_sensors: Use utf8s_to_utf16s/utf16s_to_utf8s instead handmade 
   fuctions.
 - asus_wmi_ec_sensors: Use post increment.
 - asus_wmi_ec_sensors: Use get_unaligned* for convert values.
 - asus_wmi_ec_sensors: Use PTR_ERR_OR_ZERO.
 - asus_wmi_ec_sensors: Specify per-board sensors in a declarative way 
   (by Eugene Shalygin).
 - asus_wmi_sensors: Add support for X370/X470/B450/X399 boards.

---


Denis Pauk (3):
  hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.
  hwmon: (asus_wmi_sensors) Support X370 Asus WMI.
  hwmon: (nct6775) Add ProArt X570-CREATOR WIFI support.

 Documentation/hwmon/asus_wmi_ec_sensors.rst |  35 ++
 Documentation/hwmon/asus_wmi_sensors.rst    |  74 +++
 Documentation/hwmon/index.rst               |   2 +
 MAINTAINERS                                 |   8 +
 drivers/hwmon/Kconfig                       |  24 +
 drivers/hwmon/Makefile                      |   2 +
 drivers/hwmon/asus_wmi_ec_sensors.c         | 618 ++++++++++++++++++++
 drivers/hwmon/asus_wmi_sensors.c            | 616 +++++++++++++++++++
 drivers/hwmon/nct6775.c                     |   1 +
 9 files changed, 1380 insertions(+)
 create mode 100644 Documentation/hwmon/asus_wmi_ec_sensors.rst
 create mode 100644 Documentation/hwmon/asus_wmi_sensors.rst
 create mode 100644 drivers/hwmon/asus_wmi_ec_sensors.c
 create mode 100644 drivers/hwmon/asus_wmi_sensors.c


base-commit: c0d79987a0d82671bff374c07f2201f9bdf4aaa2
-- 
2.33.0

[PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Denis Pauk]

Linux HWMON sensors driver for ASUS motherboards to read
sensors from the embedded controller.

Many ASUS motherboards do not publish all the available
sensors via the Super I/O chip but the missing ones are
available through the embedded controller (EC) registers.

This driver implements reading those sensor data via the
WMI method BREC, which is known to be present in all ASUS
motherboards based on the AMD 500 series chipsets (and
probably is available in other models too). The driver
needs to know exact register addresses for the sensors and
thus support for each motherboard has to be added explicitly.

The EC registers do not provide critical values for the
sensors and as such they are not published to the HWMON.

Supported motherboards:
* PRIME X570-PRO
* Pro WS X570-ACE
* ROG CROSSHAIR VIII HERO
* ROG CROSSHAIR VIII DARK HERO
* ROG CROSSHAIR VIII FORMULA
* ROG STRIX X570-E GAMING
* ROG STRIX B550-E GAMING

Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Co-developed-by: Eugene Shalygin <eugene.shalygin@gmail.com>
Signed-off-by: Eugene Shalygin <eugene.shalygin@gmail.com>
Tested-by: Tor Vic <torvic9@mailbox.org>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>

---
Changes in v8:
- Fix codestyle in defines and comments.
- Fix buffer length calculation.
- Use hex2bin/bin2hex for convert values in buffers.
- Remove unrequired acpi_os_free usage.
- Call mutex_lock inside of functions.

Changes in v7:
- Use dmi_first_match for directly get sensors list by board.
- Add depends on ACPI_WMI to Kconfig.
- Add response buffer size check in asus_wmi_ec_decode_reply_buffer.
- Clean up defines names.

Changes in v6:
- Generate query for all sensors on sensors setup
- Move binary to sensor value logic to separate get_sensor_value
  (by Eugene Shalygin)
- Add asus_wmi_ec_sensor to documentation index.
- Use acpi_os_free without NULL pointer check.

Changes in v5:
- Fixes build issue reported by kernel test robot with disabled ACPI_WMI.

Changes in v4:
 - implement wmi driver instead platform driver.

Changes in v3:
 - Use MODULE_DEVICE_TABLE for match devices.
 - Use get_unaligned_be32 instead incorrectly used get_unaligned_le32.
 - Add documentaion for driver.

Changes in v2:
 - Use utf8s_to_utf16s/utf16s_to_utf8s instead handmade fuctions.
 - Use post increment.
 - Use get_unaligned* for convert values.
 - Use PTR_ERR_OR_ZERO.
 - Specify per-board sensors in a declarative way (by Eugene Shalygin).
---
 Documentation/hwmon/asus_wmi_ec_sensors.rst |  35 ++
 Documentation/hwmon/index.rst               |   1 +
 MAINTAINERS                                 |   7 +
 drivers/hwmon/Kconfig                       |  12 +
 drivers/hwmon/Makefile                      |   1 +
 drivers/hwmon/asus_wmi_ec_sensors.c         | 618 ++++++++++++++++++++
 6 files changed, 674 insertions(+)
 create mode 100644 Documentation/hwmon/asus_wmi_ec_sensors.rst
 create mode 100644 drivers/hwmon/asus_wmi_ec_sensors.c

diff --git a/Documentation/hwmon/asus_wmi_ec_sensors.rst b/Documentation/hwmon/asus_wmi_ec_sensors.rst
new file mode 100644
index 000000000000..7edf08579baa
--- /dev/null
+++ b/Documentation/hwmon/asus_wmi_ec_sensors.rst
@@ -0,0 +1,35 @@
+Kernel driver asus_wmi_ec_sensors
+=================================
+
+Supported boards:
+ * PRIME X570-PRO,
+ * Pro WS X570-ACE,
+ * ROG CROSSHAIR VIII DARK HERO,
+ * ROG CROSSHAIR VIII FORMULA,
+ * ROG CROSSHAIR VIII HERO,
+ * ROG STRIX B550-E GAMING,
+ * ROG STRIX X570-E GAMING.
+
+Authors:
+    - Eugene Shalygin <eugene.shalygin@gmail.com>
+
+Description:
+------------
+ASUS mainboards publish hardware monitoring information via Super I/O
+chip and the ACPI embedded controller (EC) registers. Some of the sensors
+are only available via the EC.
+
+ASUS WMI interface provides a method (BREC) to read data from EC registers,
+which is utilized by this driver to publish those sensor readings to the
+HWMON system. The driver is aware of and reads the following sensors:
+
+1. Chipset (PCH) temperature
+2. CPU package temperature
+3. Motherboard temperature
+4. Readings from the T_Sensor header
+5. VRM temperature
+6. CPU_Opt fan RPM
+7. Chipset fan RPM
+8. Readings from the "Water flow meter" header (RPM)
+9. Readings from the "Water In" and "Water Out" temperature headers
+10. CPU current
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 7046bf1870d9..23deb1a1202f 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -43,6 +43,7 @@ Hardware Monitoring Kernel Drivers
    asb100
    asc7621
    aspeed-pwm-tacho
+   asus_wmi_ec_sensors
    bcm54140
    bel-pfe
    bpa-rs600
diff --git a/MAINTAINERS b/MAINTAINERS
index cc5eaf4e65dc..05448435991d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2937,6 +2937,13 @@ W:	http://acpi4asus.sf.net
 F:	drivers/platform/x86/asus*.c
 F:	drivers/platform/x86/eeepc*.c
 
+ASUS WMI HARDWARE MONITOR DRIVER
+M:	Eugene Shalygin <eugene.shalygin@gmail.com>
+M:	Denis Pauk <pauk.denis@gmail.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Maintained
+F:	drivers/hwmon/asus_wmi_ec_sensors.c
+
 ASUS WIRELESS RADIO CONTROL DRIVER
 M:	João Paulo Rechi Vita <jprvita@gmail.com>
 L:	platform-driver-x86@vger.kernel.org
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 7fde4c6e1e7f..01b6338d70ff 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2215,6 +2215,18 @@ config SENSORS_ATK0110
 	  This driver can also be built as a module. If so, the module
 	  will be called asus_atk0110.
 
+config SENSORS_ASUS_WMI_EC
+	tristate "ASUS WMI B550/X570"
+	depends on ACPI_WMI
+	help
+	  If you say yes here you get support for the ACPI embedded controller
+	  hardware monitoring interface found in B550/X570 ASUS motherboards.
+	  This driver will provide readings of fans, voltages and temperatures
+	  through the system firmware.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called asus_wmi_sensors_ec.
+
 endif # ACPI
 
 endif # HWMON
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index baee6a8d4dd1..aae2ff5c7335 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_HWMON_VID)		+= hwmon-vid.o
 # APCI drivers
 obj-$(CONFIG_SENSORS_ACPI_POWER) += acpi_power_meter.o
 obj-$(CONFIG_SENSORS_ATK0110)	+= asus_atk0110.o
+obj-$(CONFIG_SENSORS_ASUS_WMI_EC)	+= asus_wmi_ec_sensors.o
 
 # Native drivers
 # asb100, then w83781d go first, as they can override other drivers' addresses.
diff --git a/drivers/hwmon/asus_wmi_ec_sensors.c b/drivers/hwmon/asus_wmi_ec_sensors.c
new file mode 100644
index 000000000000..87bd32487926
--- /dev/null
+++ b/drivers/hwmon/asus_wmi_ec_sensors.c
@@ -0,0 +1,618 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HWMON driver for ASUS B550/X570 motherboards that publish sensor
+ * values via the embedded controller registers.
+ *
+ * Copyright (C) 2021 Eugene Shalygin <eugene.shalygin@gmail.com>
+ * Copyright (C) 2018-2019 Ed Brindley <kernel@maidavale.org>
+ *
+ * EC provides:
+ * Chipset temperature,
+ * CPU temperature,
+ * Motherboard temperature,
+ * T_Sensor temperature,
+ * VRM  temperature,
+ * Water In temperature,
+ * Water Out temperature,
+ * CPU Optional Fan RPM,
+ * Chipset Fan RPM,
+ * Water Flow Fan RPM,
+ * CPU current.
+ */
+
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/nls.h>
+#include <linux/units.h>
+#include <linux/wmi.h>
+#include <asm/unaligned.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#define ASUSWMI_MONITORING_GUID	"466747A0-70EC-11DE-8A39-0800200C9A66"
+#define ASUSWMI_METHODID_BLOCK_READ_EC	0x42524543 /* BREC */
+/* From the ASUS DSDT source */
+#define ASUSWMI_BREC_REGISTERS_MAX	0x10
+#define ASUSWMI_MAX_BUF_LEN	0x80
+#define SENSOR_LABEL_LEN	0x10
+
+static u32 hwmon_attributes[] = {
+	[hwmon_chip] = HWMON_C_REGISTER_TZ,
+	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
+	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
+	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
+	[hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
+};
+
+struct asus_wmi_ec_sensor_address {
+	u8 index;
+	u8 bank;
+	u8 size;
+};
+
+#define MAKE_SENSOR_ADDRESS(size_i, bank_i, index_i) {	\
+	.size = size_i,					\
+	.bank = bank_i,					\
+	.index = index_i				\
+}
+
+struct ec_sensor_info {
+	char label[SENSOR_LABEL_LEN];
+	enum hwmon_sensor_types type;
+	struct asus_wmi_ec_sensor_address addr;
+};
+
+#define EC_SENSOR(sensor_label, sensor_type, size, bank, index) {	\
+	.label = sensor_label,						\
+	.type = sensor_type,						\
+	.addr = MAKE_SENSOR_ADDRESS(size, bank, index)			\
+}
+
+enum known_ec_sensor {
+	SENSOR_TEMP_CHIPSET,
+	SENSOR_TEMP_CPU,
+	SENSOR_TEMP_MB,
+	SENSOR_TEMP_T_SENSOR,
+	SENSOR_TEMP_VRM,
+	SENSOR_FAN_CPU_OPT,
+	SENSOR_FAN_CHIPSET,
+	SENSOR_FAN_WATER_FLOW,
+	SENSOR_CURR_CPU,
+	SENSOR_TEMP_WATER_IN,
+	SENSOR_TEMP_WATER_OUT,
+	SENSOR_MAX
+};
+
+/* All known sensors for ASUS EC controllers */
+static const struct ec_sensor_info known_ec_sensors[] = {
+	[SENSOR_TEMP_CHIPSET] = EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
+	[SENSOR_TEMP_CPU] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
+	[SENSOR_TEMP_MB] = EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
+	[SENSOR_TEMP_T_SENSOR] = EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
+	[SENSOR_TEMP_VRM] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
+	[SENSOR_FAN_CPU_OPT] = EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
+	[SENSOR_FAN_CHIPSET] = EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4),
+	[SENSOR_FAN_WATER_FLOW] = EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
+	[SENSOR_CURR_CPU] = EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
+	[SENSOR_TEMP_WATER_IN] = EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
+	[SENSOR_TEMP_WATER_OUT] = EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
+};
+
+struct asus_wmi_data {
+	const enum known_ec_sensor known_board_sensors[SENSOR_MAX + 1];
+};
+
+/* boards with EC support */
+static struct asus_wmi_data sensors_board_PW_X570_P = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB, SENSOR_TEMP_VRM,
+		SENSOR_FAN_CHIPSET,
+		SENSOR_MAX
+	},
+};
+
+static struct asus_wmi_data sensors_board_PW_X570_A = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB, SENSOR_TEMP_VRM,
+		SENSOR_FAN_CHIPSET,
+		SENSOR_CURR_CPU,
+		SENSOR_MAX
+	},
+};
+
+static struct asus_wmi_data sensors_board_R_C8H = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
+		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
+		SENSOR_TEMP_WATER_IN, SENSOR_TEMP_WATER_OUT,
+		SENSOR_FAN_CPU_OPT, SENSOR_FAN_CHIPSET, SENSOR_FAN_WATER_FLOW,
+		SENSOR_CURR_CPU,
+		SENSOR_MAX
+	},
+};
+
+/* Same as Hero but without chipset fan */
+static struct asus_wmi_data sensors_board_R_C8DH = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
+		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
+		SENSOR_TEMP_WATER_IN, SENSOR_TEMP_WATER_OUT,
+		SENSOR_FAN_CPU_OPT, SENSOR_FAN_WATER_FLOW,
+		SENSOR_CURR_CPU,
+		SENSOR_MAX
+	},
+};
+
+/* Same as Hero but without water */
+static struct asus_wmi_data sensors_board_R_C8F = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
+		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
+		SENSOR_FAN_CPU_OPT, SENSOR_FAN_CHIPSET,
+		SENSOR_CURR_CPU,
+		SENSOR_MAX
+	},
+};
+
+static struct asus_wmi_data sensors_board_RS_B550_E_G = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
+		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
+		SENSOR_FAN_CPU_OPT,
+		SENSOR_MAX
+	},
+};
+
+static struct asus_wmi_data sensors_board_RS_X570_E_G = {
+	.known_board_sensors = {
+		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
+		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
+		SENSOR_FAN_CHIPSET,
+		SENSOR_CURR_CPU,
+		SENSOR_MAX
+	},
+};
+
+#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name, sensors) {	\
+	.matches = {						\
+		DMI_EXACT_MATCH(DMI_BOARD_VENDOR,		\
+				"ASUSTeK COMPUTER INC."),	\
+		DMI_EXACT_MATCH(DMI_BOARD_NAME, name),		\
+	},							\
+	.driver_data = sensors,					\
+}
+
+static const struct dmi_system_id asus_wmi_ec_dmi_table[] = {
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X570-PRO", &sensors_board_PW_X570_P),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("Pro WS X570-ACE", &sensors_board_PW_X570_A),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII DARK HERO", &sensors_board_R_C8DH),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII FORMULA", &sensors_board_R_C8F),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII HERO", &sensors_board_R_C8H),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B550-E GAMING", &sensors_board_RS_B550_E_G),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-E GAMING", &sensors_board_RS_X570_E_G),
+	{}
+};
+MODULE_DEVICE_TABLE(dmi, asus_wmi_ec_dmi_table);
+
+struct ec_sensor {
+	enum known_ec_sensor info_index;
+	u32 cached_value;
+};
+
+/**
+ * struct asus_wmi_ec_info - sensor info.
+ * @sensors: list of sensors.
+ * @read_arg: UTF-16 string to pass to BRxx() WMI function.
+ * @read_buffer: decoded output from WMI result.
+ * @nr_sensors: number of board EC sensors.
+ * @nr_registers: number of EC registers to read (sensor might span more than
+ *                         1 register).
+ * @last_updated: in jiffies.
+ */
+struct asus_wmi_ec_info {
+	struct ec_sensor sensors[SENSOR_MAX];
+	char read_arg[(ASUSWMI_BREC_REGISTERS_MAX * 4 + 1) * 2];
+	u8 read_buffer[ASUSWMI_BREC_REGISTERS_MAX];
+	unsigned int nr_sensors;
+	unsigned int nr_registers;
+	unsigned long last_updated;
+};
+
+struct asus_wmi_sensors {
+	/* lock access to internal cache */
+	struct mutex lock;
+	struct asus_wmi_ec_info ec;
+};
+
+static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
+					  const enum known_ec_sensor *bsi)
+{
+	struct ec_sensor *s = ec->sensors;
+	int i;
+
+	ec->nr_sensors = 0;
+	ec->nr_registers = 0;
+
+	for (i = 0; i < SENSOR_MAX && bsi[i] != SENSOR_MAX; i++) {
+		s[i].info_index = bsi[i];
+		ec->nr_sensors++;
+		ec->nr_registers += known_ec_sensors[bsi[i]].addr.size;
+	}
+
+	return 0;
+}
+
+/*
+ * The next four functions converts to/from BRxx string argument format.
+ * The format of the string is as follows:
+ * * The string consists of two-byte UTF-16 characters.
+ * * The value of the very first byte int the string is equal to the total
+ *   length of the next string in bytes, thus excluding the first two-byte
+ *   character.
+ * * The rest of the string encodes pairs of (bank, index) pairs, where both
+ *   values are byte-long (0x00 to 0xFF).
+ * * Numbers are encoded as UTF-16 hex values.
+ */
+static int asus_wmi_ec_decode_reply_buffer(const u8 *inp, u8 *out, u32 length)
+{
+	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
+	const char *pos = buffer;
+	const u8 *data = inp + 2;
+	u32 len;
+
+	/* Minimum of size of response and size of ACPI result*/
+	len = min_t(u32, inp[0] / 4, (length - 2) / 4);
+	len = min_t(u32, len, ASUSWMI_MAX_BUF_LEN);
+
+	utf16s_to_utf8s((wchar_t *)data, len * 2,  UTF16_LITTLE_ENDIAN, buffer, len * 2);
+
+	return hex2bin(out, pos, len);
+}
+
+static void asus_wmi_ec_encode_registers(const u16 *registers, u8 len, char *out)
+{
+	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
+	char *pos = buffer;
+	unsigned int i;
+	u8 byte;
+
+	*out++ = len * 8;
+	*out++ = 0;
+
+	for (i = 0; i < len; i++) {
+		byte = registers[i] >> 8;
+		pos = bin2hex(pos, &byte, 1);
+		byte = registers[i];
+		pos = bin2hex(pos, &byte, 1);
+	}
+
+	utf8s_to_utf16s(buffer, len * 4, UTF16_LITTLE_ENDIAN, (wchar_t *)out, len * 4);
+}
+
+static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
+{
+	u16 registers[ASUSWMI_BREC_REGISTERS_MAX];
+	const struct ec_sensor_info *si;
+	int i, j, register_idx = 0;
+
+	for (i = 0; i < ec->nr_sensors; i++) {
+		si = &known_ec_sensors[ec->sensors[i].info_index];
+		for (j = 0; j < si->addr.size; j++, register_idx++)
+			registers[register_idx] = (si->addr.bank << 8) + si->addr.index + j;
+	}
+
+	asus_wmi_ec_encode_registers(registers, ec->nr_registers, ec->read_arg);
+}
+
+static int asus_wmi_ec_block_read(u32 method_id, char *query, u8 *out)
+{
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_buffer input;
+	union acpi_object *obj;
+	acpi_status status;
+
+	/* The first byte of the BRxx() argument string has to be the string size. */
+	input.length = query[0] + 2;
+	input.pointer = query;
+	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
+				     method_id, &input, &output);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	obj = output.pointer;
+	if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 2)
+		return -EIO;
+
+	return asus_wmi_ec_decode_reply_buffer(obj->buffer.pointer, out, obj->buffer.length);
+}
+
+static inline u32 get_sensor_value(const struct ec_sensor_info *si, u8 *data)
+{
+	switch (si->addr.size) {
+	case 1:
+		return *data;
+	case 2:
+		return get_unaligned_be16(data);
+	case 4:
+		return get_unaligned_be32(data);
+	default:
+		return 0;
+	}
+}
+
+static void asus_wmi_ec_update_ec_sensors(struct asus_wmi_ec_info *ec)
+{
+	const struct ec_sensor_info *si;
+	u8 i_sensor;
+	struct ec_sensor *s;
+	u8 *data;
+
+	data = ec->read_buffer;
+	for (i_sensor = 0; i_sensor < ec->nr_sensors; i_sensor++) {
+		s = &ec->sensors[i_sensor];
+		si = &known_ec_sensors[s->info_index];
+		s->cached_value = get_sensor_value(si, data);
+		data += si->addr.size;
+	}
+}
+
+static int asus_wmi_ec_scale_sensor_value(u32 value, int data_type)
+{
+	switch (data_type) {
+	case hwmon_curr:
+	case hwmon_temp:
+	case hwmon_in:
+		return value * MILLI;
+	default:
+		return value;
+	}
+}
+
+static int asus_wmi_ec_find_sensor_index(const struct asus_wmi_ec_info *ec,
+					 enum hwmon_sensor_types type, int channel)
+{
+	int i;
+
+	for (i = 0; i < ec->nr_sensors; i++) {
+		if (known_ec_sensors[ec->sensors[i].info_index].type == type) {
+			if (channel == 0)
+				return i;
+
+			channel--;
+		}
+	}
+	return -EINVAL;
+}
+
+static int asus_wmi_ec_get_cached_value_or_update(int sensor_index,
+						  struct asus_wmi_sensors *state,
+						  u32 *value)
+{
+	int ret;
+
+	mutex_lock(&state->lock);
+
+	if (time_after(jiffies, state->ec.last_updated + HZ)) {
+		ret = asus_wmi_ec_block_read(ASUSWMI_METHODID_BLOCK_READ_EC,
+					     state->ec.read_arg,
+					     state->ec.read_buffer);
+		if (ret) {
+			mutex_unlock(&state->lock);
+			return ret;
+		}
+
+		asus_wmi_ec_update_ec_sensors(&state->ec);
+		state->ec.last_updated = jiffies;
+	}
+
+	*value = state->ec.sensors[sensor_index].cached_value;
+
+	mutex_unlock(&state->lock);
+
+	return 0;
+}
+
+/* Now follow the functions that implement the hwmon interface */
+
+static int asus_wmi_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+				  u32 attr, int channel, long *val)
+{
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+	int ret, sidx, info_index;
+	u32 value = 0;
+
+	sidx = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+	if (sidx < 0)
+		return sidx;
+
+	ret = asus_wmi_ec_get_cached_value_or_update(sidx, sensor_data, &value);
+	if (ret)
+		return ret;
+
+	info_index = sensor_data->ec.sensors[sidx].info_index;
+	*val = asus_wmi_ec_scale_sensor_value(value,
+					      known_ec_sensors[info_index].type);
+
+	return ret;
+}
+
+static int asus_wmi_ec_hwmon_read_string(struct device *dev,
+					 enum hwmon_sensor_types type, u32 attr,
+					 int channel, const char **str)
+{
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+	int sensor_index;
+
+	sensor_index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+	*str = known_ec_sensors[sensor_data->ec.sensors[sensor_index].info_index].label;
+
+	return 0;
+}
+
+static umode_t asus_wmi_ec_hwmon_is_visible(const void *drvdata,
+					    enum hwmon_sensor_types type, u32 attr,
+					    int channel)
+{
+	const struct asus_wmi_sensors *sensor_data = drvdata;
+	int index;
+
+	index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+
+	return index < 0 ? 0 : 0444;
+}
+
+static int asus_wmi_hwmon_add_chan_info(struct hwmon_channel_info *asus_wmi_hwmon_chan,
+					struct device *dev, int num,
+					enum hwmon_sensor_types type, u32 config)
+{
+	u32 *cfg;
+
+	cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
+	if (!cfg)
+		return -ENOMEM;
+
+	asus_wmi_hwmon_chan->type = type;
+	asus_wmi_hwmon_chan->config = cfg;
+	memset32(cfg, config, num);
+
+	return 0;
+}
+
+static const struct hwmon_ops asus_wmi_ec_hwmon_ops = {
+	.is_visible = asus_wmi_ec_hwmon_is_visible,
+	.read = asus_wmi_ec_hwmon_read,
+	.read_string = asus_wmi_ec_hwmon_read_string,
+};
+
+static struct hwmon_chip_info asus_wmi_ec_chip_info = {
+	.ops = &asus_wmi_ec_hwmon_ops,
+};
+
+static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
+					      struct asus_wmi_sensors *sensor_data,
+					      const enum known_ec_sensor *bsi)
+{
+	struct hwmon_channel_info *asus_wmi_hwmon_chan;
+	const struct hwmon_channel_info **ptr_asus_wmi_ci;
+	int nr_count[hwmon_max] = {}, nr_types = 0;
+	const struct hwmon_chip_info *chip_info;
+	const struct ec_sensor_info *si;
+	enum hwmon_sensor_types type;
+	struct device *hwdev;
+	int i, ret;
+
+	ret = asus_wmi_ec_fill_board_sensors(&sensor_data->ec, bsi);
+	if (ret)
+		return ret;
+
+	if (!sensor_data->ec.nr_sensors)
+		return -ENODEV;
+
+	for (i = 0; i < sensor_data->ec.nr_sensors; i++) {
+		si = &known_ec_sensors[sensor_data->ec.sensors[i].info_index];
+		if (!nr_count[si->type])
+			nr_types++;
+		nr_count[si->type]++;
+	}
+
+	if (nr_count[hwmon_temp]) {
+		nr_count[hwmon_chip]++;
+		nr_types++;
+	}
+
+	/*
+	 * If we can get values for all the registers in a single query,
+	 * the query will not change from call to call.
+	 */
+	asus_wmi_ec_make_block_read_query(&sensor_data->ec);
+
+	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types,
+					   sizeof(*asus_wmi_hwmon_chan),
+					   GFP_KERNEL);
+	if (!asus_wmi_hwmon_chan)
+		return -ENOMEM;
+
+	ptr_asus_wmi_ci = devm_kcalloc(dev, nr_types + 1,
+				       sizeof(*ptr_asus_wmi_ci), GFP_KERNEL);
+	if (!ptr_asus_wmi_ci)
+		return -ENOMEM;
+
+	asus_wmi_ec_chip_info.info = ptr_asus_wmi_ci;
+	chip_info = &asus_wmi_ec_chip_info;
+
+	for (type = 0; type < hwmon_max; type++) {
+		if (!nr_count[type])
+			continue;
+
+		ret = asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
+						   nr_count[type], type,
+						   hwmon_attributes[type]);
+		if (ret)
+			return ret;
+
+		*ptr_asus_wmi_ci++ = asus_wmi_hwmon_chan++;
+	}
+
+	dev_dbg(dev, "board has %d EC sensors that span %d registers",
+		sensor_data->ec.nr_sensors,
+		sensor_data->ec.nr_registers);
+
+	hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_ec_sensors",
+						     sensor_data, chip_info, NULL);
+
+	return PTR_ERR_OR_ZERO(hwdev);
+}
+
+static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+	struct asus_wmi_sensors *sensor_data;
+	struct asus_wmi_data *board_sensors;
+	const enum known_ec_sensor *bsi;
+	const struct dmi_system_id *dmi_id;
+	struct device *dev = &wdev->dev;
+
+	dmi_id = dmi_first_match(asus_wmi_ec_dmi_table);
+	if (!dmi_id)
+		return -ENODEV;
+
+	board_sensors = dmi_id->driver_data;
+	if (!board_sensors)
+		return -ENODEV;
+
+	bsi = board_sensors->known_board_sensors;
+
+	sensor_data = devm_kzalloc(dev, sizeof(*sensor_data), GFP_KERNEL);
+	if (!sensor_data)
+		return -ENOMEM;
+
+	mutex_init(&sensor_data->lock);
+
+	dev_set_drvdata(dev, sensor_data);
+
+	return asus_wmi_ec_configure_sensor_setup(dev,
+						  sensor_data, bsi);
+}
+
+static const struct wmi_device_id asus_ec_wmi_id_table[] = {
+	{ ASUSWMI_MONITORING_GUID, NULL },
+	{ }
+};
+
+static struct wmi_driver asus_sensors_wmi_driver = {
+	.driver = {
+		.name = "asus_wmi_ec_sensors",
+	},
+	.id_table = asus_ec_wmi_id_table,
+	.probe = asus_wmi_probe,
+};
+module_wmi_driver(asus_sensors_wmi_driver);
+
+MODULE_AUTHOR("Ed Brindley <kernel@maidavale.org>");
+MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@gmail.com>");
+MODULE_DESCRIPTION("Asus WMI Sensors Driver");
+MODULE_LICENSE("GPL");
-- 
2.33.0

[PATCH v8 2/3] hwmon: (asus_wmi_sensors) Support X370 Asus WMI.

[Denis Pauk]

Provides a Linux kernel module "asus_wmi_sensors" that provides sensor
readouts via ASUS' WMI interface present in the UEFI of
X370/X470/B450/X399 Ryzen motherboards.

Supported motherboards:
* ROG CROSSHAIR VI HERO,
* PRIME X399-A,
* PRIME X470-PRO,
* ROG CROSSHAIR VI EXTREME,
* ROG CROSSHAIR VI HERO (WI-FI AC),
* ROG CROSSHAIR VII HERO,
* ROG CROSSHAIR VII HERO (WI-FI),
* ROG STRIX B450-E GAMING,
* ROG STRIX B450-F GAMING,
* ROG STRIX B450-I GAMING,
* ROG STRIX X399-E GAMING,
* ROG STRIX X470-F GAMING,
* ROG STRIX X470-I GAMING,
* ROG ZENITH EXTREME,
* ROG ZENITH EXTREME ALPHA.

Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Co-developed-by: Ed Brindley <kernel@maidavale.org>
Signed-off-by: Ed Brindley <kernel@maidavale.org>

---
Changes in v8:
- Fix codestyle in defines and comments.
- Call mutex_lock inside of functions.

Changes in v7:
- Add depends on ACPI_WMI to Kconfig.
- Clean up defines names.

Changes in v6:
- Add asus_wmi_sensor to documentation index.

Changes in v5:
- Fixes build issue reported by kernel test robot with disabled ACPI_WMI.
- Remove sensor->name check as always eevaluated to true.

Changes in v4:
- Implement wmi driver instead platform driver.
- Update documentation.

Changes in v3:
- Use MODULE_DEVICE_TABLE for match devices.
- Add documentaion for driver.

Changes in v2:
- Add module for boards with support of WMI interface returned sensor name and
  value of sensor..
---
 Documentation/hwmon/asus_wmi_sensors.rst |  74 +++
 Documentation/hwmon/index.rst            |   1 +
 MAINTAINERS                              |   1 +
 drivers/hwmon/Kconfig                    |  12 +
 drivers/hwmon/Makefile                   |   1 +
 drivers/hwmon/asus_wmi_sensors.c         | 616 +++++++++++++++++++++++
 6 files changed, 705 insertions(+)
 create mode 100644 Documentation/hwmon/asus_wmi_sensors.rst
 create mode 100644 drivers/hwmon/asus_wmi_sensors.c

diff --git a/Documentation/hwmon/asus_wmi_sensors.rst b/Documentation/hwmon/asus_wmi_sensors.rst
new file mode 100644
index 000000000000..cc88adc8915f
--- /dev/null
+++ b/Documentation/hwmon/asus_wmi_sensors.rst
@@ -0,0 +1,74 @@
+Kernel driver asus_wmi_sensors
+=================================
+
+Supported boards:
+ * PRIME X399-A,
+ * PRIME X470-PRO,
+ * ROG CROSSHAIR VI EXTREME,
+ * ROG CROSSHAIR VI HERO,
+ * ROG CROSSHAIR VI HERO (WI-FI AC),
+ * ROG CROSSHAIR VII HERO,
+ * ROG CROSSHAIR VII HERO (WI-FI),
+ * ROG STRIX B450-E GAMING,
+ * ROG STRIX B450-F GAMING,
+ * ROG STRIX B450-I GAMING,
+ * ROG STRIX X399-E GAMING,
+ * ROG STRIX X470-F GAMING,
+ * ROG STRIX X470-I GAMING,
+ * ROG ZENITH EXTREME,
+ * ROG ZENITH EXTREME ALPHA.
+
+Authors:
+    - Ed Brindley <kernel@maidavale.org>
+
+Description:
+------------
+ASUS mainboards publish hardware monitoring information via WMI interface.
+
+ASUS WMI interface provides a methods to get list of sensors and values of
+such, which is utilized by this driver to publish those sensor readings to the
+HWMON system. The driver is aware of and reads the following sensors:
+ * CPU Core Voltage,
+ * CPU SOC Voltage,
+ * DRAM Voltage,
+ * VDDP Voltage,
+ * 1.8V PLL Voltage,
+ * +12V Voltage,
+ * +5V Voltage,
+ * 3VSB Voltage,
+ * VBAT Voltage,
+ * AVCC3 Voltage,
+ * SB 1.05V Voltage,
+ * CPU Core Voltage,
+ * CPU SOC Voltage,
+ * DRAM Voltage,
+ * CPU Fan RPM,
+ * Chassis Fan 1 RPM,
+ * Chassis Fan 2 RPM,
+ * Chassis Fan 3 RPM,
+ * HAMP Fan RPM,
+ * Water Pump RPM,
+ * CPU OPT RPM,
+ * Water Flow RPM,
+ * AIO Pump RPM,
+ * CPU Temperature,
+ * CPU Socket Temperature,
+ * Motherboard Temperature,
+ * Chipset Temperature,
+ * Tsensor 1 Temperature,
+ * CPU VRM Temperature,
+ * Water In,
+ * Water Out,
+ * CPU VRM Output Current.
+
+Known Issues:
+* The WMI implementation in some of Asus' BIOSes is buggy. This can result in
+   fans stopping, fans getting stuck at max speed, or temperature readouts
+   getting stuck. This is not an issue with the driver, but the BIOS. The Prime
+   X470 Pro seems particularly bad for this. The more frequently the WMI
+   interface is polled the greater the potential for this to happen. Until you
+   have subjected your computer to an extended soak test while polling the
+   sensors frequently, don't leave you computer unattended. Upgrading to new
+   BIOS version with method version greater than or equal to two should
+   rectify the issue.
+* A few boards report 12v voltages to be ~10v.
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 23deb1a1202f..6dca9df9d24a 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -44,6 +44,7 @@ Hardware Monitoring Kernel Drivers
    asc7621
    aspeed-pwm-tacho
    asus_wmi_ec_sensors
+   asus_wmi_sensors
    bcm54140
    bel-pfe
    bpa-rs600
diff --git a/MAINTAINERS b/MAINTAINERS
index 05448435991d..46036c184330 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2943,6 +2943,7 @@ M:	Denis Pauk <pauk.denis@gmail.com>
 L:	linux-hwmon@vger.kernel.org
 S:	Maintained
 F:	drivers/hwmon/asus_wmi_ec_sensors.c
+F:	drivers/hwmon/asus_wmi_sensors.c
 
 ASUS WIRELESS RADIO CONTROL DRIVER
 M:	João Paulo Rechi Vita <jprvita@gmail.com>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 01b6338d70ff..f4e53d02d3d7 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2215,6 +2215,18 @@ config SENSORS_ATK0110
 	  This driver can also be built as a module. If so, the module
 	  will be called asus_atk0110.
 
+config SENSORS_ASUS_WMI
+	tristate "ASUS WMI X370/X470/B450/X399"
+	depends on ACPI_WMI
+	help
+	  If you say yes here you get support for the ACPI hardware monitoring
+	  interface found in X370/X470/B450/X399 ASUS motherboards. This driver
+	  will provide readings of fans, voltages and temperatures through the system
+	  firmware.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called asus_wmi_sensors.
+
 config SENSORS_ASUS_WMI_EC
 	tristate "ASUS WMI B550/X570"
 	depends on ACPI_WMI
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index aae2ff5c7335..656a6191a0f8 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_HWMON_VID)		+= hwmon-vid.o
 # APCI drivers
 obj-$(CONFIG_SENSORS_ACPI_POWER) += acpi_power_meter.o
 obj-$(CONFIG_SENSORS_ATK0110)	+= asus_atk0110.o
+obj-$(CONFIG_SENSORS_ASUS_WMI)	+= asus_wmi_sensors.o
 obj-$(CONFIG_SENSORS_ASUS_WMI_EC)	+= asus_wmi_ec_sensors.o
 
 # Native drivers
diff --git a/drivers/hwmon/asus_wmi_sensors.c b/drivers/hwmon/asus_wmi_sensors.c
new file mode 100644
index 000000000000..45709b6cbbf5
--- /dev/null
+++ b/drivers/hwmon/asus_wmi_sensors.c
@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HWMON driver for ASUS motherboards that provides sensor readouts via WMI
+ * interface present in the UEFI of the X370/X470/B450/X399 Ryzen motherboards.
+ *
+ * Copyright (C) 2018-2019 Ed Brindley <kernel@maidavale.org>
+ *
+ * WMI interface provides:
+ * CPU Core Voltage,
+ * CPU SOC Voltage,
+ * DRAM Voltage,
+ * VDDP Voltage,
+ * 1.8V PLL Voltage,
+ * +12V Voltage,
+ * +5V Voltage,
+ * 3VSB Voltage,
+ * VBAT Voltage,
+ * AVCC3 Voltage,
+ * SB 1.05V Voltage,
+ * CPU Core Voltage,
+ * CPU SOC Voltage,
+ * DRAM Voltage,
+ * CPU Fan RPM,
+ * Chassis Fan 1 RPM,
+ * Chassis Fan 2 RPM,
+ * Chassis Fan 3 RPM,
+ * HAMP Fan RPM,
+ * Water Pump RPM,
+ * CPU OPT RPM,
+ * Water Flow RPM,
+ * AIO Pump RPM,
+ * CPU Temperature,
+ * CPU Socket Temperature,
+ * Motherboard Temperature,
+ * Chipset Temperature,
+ * Tsensor 1 Temperature,
+ * CPU VRM Temperature,
+ * Water In,
+ * Water Out,
+ * CPU VRM Output Current.
+ */
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/units.h>
+#include <linux/wmi.h>
+
+#define ASUSWMI_MONITORING_GUID	"466747A0-70EC-11DE-8A39-0800200C9A66"
+#define ASUSWMI_METHODID_GET_VALUE	0x52574543 /* RWEC */
+#define ASUSWMI_METHODID_UPDATE_BUFFER	0x51574543 /* QWEC */
+#define ASUSWMI_METHODID_GET_INFO	0x50574543 /* PWEC */
+#define ASUSWMI_METHODID_GET_NUMBER	0x50574572 /* PWEr */
+#define ASUSWMI_METHODID_GET_VERSION	0x50574574 /* PWEt */
+
+#define ASUS_WMI_MAX_STR_SIZE	32
+
+#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name) {			\
+	.matches = {						\
+		DMI_EXACT_MATCH(DMI_BOARD_VENDOR,		\
+				"ASUSTeK COMPUTER INC."),	\
+		DMI_EXACT_MATCH(DMI_BOARD_NAME, name),		\
+	},							\
+}
+
+static const struct dmi_system_id asus_wmi_dmi_table[] = {
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X399-A"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X470-PRO"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI EXTREME"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI HERO"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI HERO (WI-FI AC)"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VII HERO"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VII HERO (WI-FI)"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-E GAMING"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-F GAMING"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-I GAMING"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X399-E GAMING"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X470-F GAMING"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X470-I GAMING"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH EXTREME"),
+	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH EXTREME ALPHA"),
+	{}
+};
+MODULE_DEVICE_TABLE(dmi, asus_wmi_dmi_table);
+
+enum asus_wmi_sensor_class {
+	VOLTAGE = 0x0,
+	TEMPERATURE_C = 0x1,
+	FAN_RPM = 0x2,
+	CURRENT = 0x3,
+	WATER_FLOW = 0x4,
+};
+
+enum asus_wmi_location {
+	CPU = 0x0,
+	CPU_SOC = 0x1,
+	DRAM = 0x2,
+	MOTHERBOARD = 0x3,
+	CHIPSET = 0x4,
+	AUX = 0x5,
+	VRM = 0x6,
+	COOLER = 0x7
+};
+
+enum asus_wmi_type {
+	SIGNED_INT = 0x0,
+	UNSIGNED_INT = 0x1,
+	SCALED = 0x3,
+};
+
+enum asus_wmi_source {
+	SIO = 0x1,
+	EC = 0x2
+};
+
+static enum hwmon_sensor_types asus_data_types[] = {
+	[VOLTAGE] = hwmon_in,
+	[TEMPERATURE_C] = hwmon_temp,
+	[FAN_RPM] = hwmon_fan,
+	[CURRENT] = hwmon_curr,
+	[WATER_FLOW] = hwmon_fan,
+};
+
+static u32 hwmon_attributes[] = {
+	[hwmon_chip] = HWMON_C_REGISTER_TZ,
+	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
+	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
+	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
+	[hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
+};
+
+/**
+ * struct asus_wmi_sensor_info - sensor info.
+ * @id: sensor id.
+ * @data_type: sensor class e.g. voltage, temp etc.
+ * @location: sensor location.
+ * @name: sensor name.
+ * @source: sensor source.
+ * @type: sensor type signed, unsigned etc.
+ * @cached_value: cached sensor value.
+ */
+struct asus_wmi_sensor_info {
+	u32 id;
+	int data_type;
+	int location;
+	char name[ASUS_WMI_MAX_STR_SIZE];
+	int source;
+	int type;
+	u32 cached_value;
+};
+
+struct asus_wmi_wmi_info {
+	u8 buffer;
+	unsigned long source_last_updated[3];	/* in jiffies */
+	int sensor_count;
+
+	const struct asus_wmi_sensor_info **info[hwmon_max];
+	struct asus_wmi_sensor_info **info_by_id;
+};
+
+struct asus_wmi_sensors {
+	/* lock access to internal cache */
+	struct mutex lock;
+	struct asus_wmi_wmi_info wmi;
+};
+
+/*
+ * Universal method for calling WMI method
+ */
+static int asus_wmi_call_method(u32 method_id, u32 *args, struct acpi_buffer *output)
+{
+	struct acpi_buffer input = {(acpi_size) sizeof(*args), args };
+	acpi_status status;
+
+	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
+				     method_id, &input, output);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * Gets the version of the ASUS sensors interface implemented
+ */
+static int asus_wmi_get_version(u32 *version)
+{
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	u32 args[] = {0, 0, 0};
+	union acpi_object *obj;
+	int err;
+
+	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_VERSION, args, &output);
+	if (err)
+		return err;
+
+	obj = output.pointer;
+	if (!obj || obj->type != ACPI_TYPE_INTEGER)
+		return -EIO;
+
+	*version = obj->integer.value;
+
+	return 0;
+}
+
+/*
+ * Gets the number of sensor items
+ */
+static int asus_wmi_get_item_count(u32 *count)
+{
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	u32 args[] = {0, 0, 0};
+	union acpi_object *obj;
+	int err;
+
+	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_NUMBER, args, &output);
+	if (err)
+		return err;
+
+	obj = output.pointer;
+	if (!obj || obj->type != ACPI_TYPE_INTEGER)
+		return -EIO;
+
+	*count = obj->integer.value;
+
+	return 0;
+}
+
+static int asus_wmi_hwmon_add_chan_info(struct hwmon_channel_info *asus_wmi_hwmon_chan,
+					struct device *dev, int num,
+					enum hwmon_sensor_types type, u32 config)
+{
+	u32 *cfg;
+
+	cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
+	if (!cfg)
+		return -ENOMEM;
+
+	asus_wmi_hwmon_chan->type = type;
+	asus_wmi_hwmon_chan->config = cfg;
+	memset32(cfg, config, num);
+
+	return 0;
+}
+
+/*
+ * For a given sensor item returns details e.g. type (voltage/temperature/fan speed etc), bank etc
+ */
+static int asus_wmi_sensor_info(int index, struct asus_wmi_sensor_info *s)
+{
+	union acpi_object name_obj, data_type_obj, location_obj, source_obj, type_obj;
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	u32 args[] = {index, 0};
+	union acpi_object *obj;
+	int err;
+
+	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_INFO, args, &output);
+	if (err)
+		return err;
+
+	s->id = index;
+
+	obj = output.pointer;
+	if (!obj || obj->type != ACPI_TYPE_PACKAGE)
+		return -EIO;
+
+	if (obj->package.count != 5)
+		return 1;
+
+	name_obj = obj->package.elements[0];
+
+	if (name_obj.type != ACPI_TYPE_STRING)
+		return 1;
+
+	strncpy(s->name, name_obj.string.pointer, sizeof(s->name) - 1);
+
+	data_type_obj = obj->package.elements[1];
+
+	if (data_type_obj.type != ACPI_TYPE_INTEGER)
+		return 1;
+
+	s->data_type = data_type_obj.integer.value;
+
+	location_obj = obj->package.elements[2];
+
+	if (location_obj.type != ACPI_TYPE_INTEGER)
+		return 1;
+
+	s->location = location_obj.integer.value;
+
+	source_obj = obj->package.elements[3];
+
+	if (source_obj.type != ACPI_TYPE_INTEGER)
+		return 1;
+
+	s->source = source_obj.integer.value;
+
+	type_obj = obj->package.elements[4];
+
+	if (type_obj.type != ACPI_TYPE_INTEGER)
+		return 1;
+
+	s->type = type_obj.integer.value;
+
+	return 0;
+}
+
+static int asus_wmi_update_buffer(u8 source)
+{
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	u32 args[] = {source, 0};
+
+	return asus_wmi_call_method(ASUSWMI_METHODID_UPDATE_BUFFER, args, &output);
+}
+
+static int asus_wmi_get_sensor_value(u8 index, u32 *value)
+{
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	u32 args[] = {index, 0};
+	union acpi_object *obj;
+	int err;
+
+	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_VALUE, args, &output);
+	if (err)
+		return err;
+
+	obj = output.pointer;
+	if (!obj || obj->type != ACPI_TYPE_INTEGER)
+		return -EIO;
+
+	*value = obj->integer.value;
+
+	return 0;
+}
+
+static void asus_wmi_update_values_for_source(u8 source, struct asus_wmi_sensors *sensor_data)
+{
+	struct asus_wmi_sensor_info *sensor;
+	int value = 0;
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < sensor_data->wmi.sensor_count; i++) {
+		sensor = sensor_data->wmi.info_by_id[i];
+		if (sensor && sensor->source == source) {
+			ret = asus_wmi_get_sensor_value(sensor->id, &value);
+			if (!ret)
+				sensor->cached_value = value;
+		}
+	}
+}
+
+static int asus_wmi_scale_sensor_value(u32 value, int data_type)
+{
+	/* FAN_RPM and WATER_FLOW don't need scaling */
+	switch (data_type) {
+	case VOLTAGE:
+		return DIV_ROUND_CLOSEST(value,  MILLI);
+	case TEMPERATURE_C:
+		return value * MILLI;
+	case CURRENT:
+		return value * MILLI;
+	}
+	return value;
+}
+
+static int asus_wmi_get_cached_value_or_update(const struct asus_wmi_sensor_info *sensor,
+					       struct asus_wmi_sensors *sensor_data,
+					       u32 *value)
+{
+	int ret;
+
+	mutex_lock(&sensor_data->lock);
+
+	if (time_after(jiffies, sensor_data->wmi.source_last_updated[sensor->source] + HZ)) {
+		ret = asus_wmi_update_buffer(sensor->source);
+		if (ret) {
+			mutex_unlock(&sensor_data->lock);
+			return -EIO;
+		}
+
+		sensor_data->wmi.buffer = sensor->source;
+
+		asus_wmi_update_values_for_source(sensor->source, sensor_data);
+		sensor_data->wmi.source_last_updated[sensor->source] = jiffies;
+	}
+
+	*value = sensor->cached_value;
+
+	mutex_unlock(&sensor_data->lock);
+
+	return 0;
+}
+
+/* Now follow the functions that implement the hwmon interface */
+static int asus_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+			       u32 attr, int channel, long *val)
+{
+	const struct asus_wmi_sensor_info *sensor;
+	u32 value = 0;
+	int ret;
+
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+
+	sensor = *(sensor_data->wmi.info[type] + channel);
+
+	ret = asus_wmi_get_cached_value_or_update(sensor, sensor_data, &value);
+	if (!ret)
+		*val = asus_wmi_scale_sensor_value(value, sensor->data_type);
+
+	return ret;
+}
+
+static int asus_wmi_hwmon_read_string(struct device *dev,
+				      enum hwmon_sensor_types type, u32 attr,
+				      int channel, const char **str)
+{
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+	const struct asus_wmi_sensor_info *sensor;
+
+	sensor = *(sensor_data->wmi.info[type] + channel);
+	*str = sensor->name;
+
+	return 0;
+}
+
+static umode_t asus_wmi_hwmon_is_visible(const void *drvdata,
+					 enum hwmon_sensor_types type, u32 attr,
+					 int channel)
+{
+	const struct asus_wmi_sensors *sensor_data = drvdata;
+	const struct asus_wmi_sensor_info *sensor;
+
+	sensor = *(sensor_data->wmi.info[type] + channel);
+	if (sensor)
+		return 0444;
+
+	return 0;
+}
+
+static const struct hwmon_ops asus_wmi_hwmon_ops = {
+	.is_visible = asus_wmi_hwmon_is_visible,
+	.read = asus_wmi_hwmon_read,
+	.read_string = asus_wmi_hwmon_read_string,
+};
+
+static struct hwmon_chip_info asus_wmi_chip_info = {
+	.ops = &asus_wmi_hwmon_ops,
+	.info = NULL,
+};
+
+static int asus_wmi_configure_sensor_setup(struct device *dev,
+					   struct asus_wmi_sensors *sensor_data)
+{
+	const struct hwmon_channel_info **ptr_asus_wmi_ci;
+	struct hwmon_channel_info *asus_wmi_hwmon_chan;
+	int nr_count[hwmon_max] = {}, nr_types = 0;
+	struct asus_wmi_sensor_info *temp_sensor;
+	const struct hwmon_chip_info *chip_info;
+	enum hwmon_sensor_types type;
+	struct device *hwdev;
+	int i, idx;
+	int err;
+
+	sensor_data->wmi.buffer = -1;
+	temp_sensor = devm_kcalloc(dev, 1, sizeof(*temp_sensor), GFP_KERNEL);
+	if (!temp_sensor)
+		return -ENOMEM;
+
+	for (i = 0; i < sensor_data->wmi.sensor_count; i++) {
+		err = asus_wmi_sensor_info(i, temp_sensor);
+		if (err)
+			return -EINVAL;
+
+		switch (temp_sensor->data_type) {
+		case TEMPERATURE_C:
+		case VOLTAGE:
+		case CURRENT:
+		case FAN_RPM:
+		case WATER_FLOW:
+			type = asus_data_types[temp_sensor->data_type];
+			if (!nr_count[type])
+				nr_types++;
+			nr_count[type]++;
+			break;
+		}
+	}
+
+	if (nr_count[hwmon_temp])
+		nr_count[hwmon_chip]++, nr_types++;
+
+	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types,
+					   sizeof(*asus_wmi_hwmon_chan),
+					   GFP_KERNEL);
+	if (!asus_wmi_hwmon_chan)
+		return -ENOMEM;
+
+	ptr_asus_wmi_ci = devm_kcalloc(dev, nr_types + 1,
+				       sizeof(*ptr_asus_wmi_ci), GFP_KERNEL);
+	if (!ptr_asus_wmi_ci)
+		return -ENOMEM;
+
+	asus_wmi_chip_info.info = ptr_asus_wmi_ci;
+	chip_info = &asus_wmi_chip_info;
+
+	sensor_data->wmi.info_by_id = devm_kcalloc(dev, sensor_data->wmi.sensor_count,
+						   sizeof(*sensor_data->wmi.info_by_id),
+						   GFP_KERNEL);
+
+	if (!sensor_data->wmi.info_by_id)
+		return -ENOMEM;
+
+	for (type = 0; type < hwmon_max; type++) {
+		if (!nr_count[type])
+			continue;
+
+		asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
+					     nr_count[type], type,
+					     hwmon_attributes[type]);
+		*ptr_asus_wmi_ci++ = asus_wmi_hwmon_chan++;
+
+		sensor_data->wmi.info[type] = devm_kcalloc(dev,
+							   nr_count[type],
+							   sizeof(*sensor_data->wmi.info),
+							   GFP_KERNEL);
+		if (!sensor_data->wmi.info[type])
+			return -ENOMEM;
+	}
+
+	for (i = sensor_data->wmi.sensor_count - 1; i >= 0; i--) {
+		temp_sensor = devm_kzalloc(dev, sizeof(*temp_sensor), GFP_KERNEL);
+		if (!temp_sensor)
+			return -ENOMEM;
+
+		err = asus_wmi_sensor_info(i, temp_sensor);
+		if (err)
+			continue;
+
+		switch (temp_sensor->data_type) {
+		case TEMPERATURE_C:
+		case VOLTAGE:
+		case CURRENT:
+		case FAN_RPM:
+		case WATER_FLOW:
+			type = asus_data_types[temp_sensor->data_type];
+			idx = --nr_count[type];
+			*(sensor_data->wmi.info[type] + idx) = temp_sensor;
+			sensor_data->wmi.info_by_id[i] = temp_sensor;
+			break;
+		}
+	}
+
+	dev_dbg(dev, "board has %d sensors",
+		sensor_data->wmi.sensor_count);
+
+	hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_sensors",
+						     sensor_data, chip_info, NULL);
+
+	return PTR_ERR_OR_ZERO(hwdev);
+}
+
+static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+	struct asus_wmi_sensors *sensor_data;
+	struct device *dev = &wdev->dev;
+	u32 version = 0;
+
+	if (!dmi_check_system(asus_wmi_dmi_table))
+		return -ENODEV;
+
+	sensor_data = devm_kzalloc(dev, sizeof(*sensor_data), GFP_KERNEL);
+	if (!sensor_data)
+		return -ENOMEM;
+
+	if (asus_wmi_get_version(&version))
+		return -ENODEV;
+
+	if (asus_wmi_get_item_count(&sensor_data->wmi.sensor_count))
+		return -ENODEV;
+
+	if (sensor_data->wmi.sensor_count  <= 0 || version < 2) {
+		dev_info(dev, "version: %u with %d sensors is unsupported\n",
+			 version, sensor_data->wmi.sensor_count);
+
+		return -ENODEV;
+	}
+
+	mutex_init(&sensor_data->lock);
+
+	dev_set_drvdata(dev, sensor_data);
+
+	return asus_wmi_configure_sensor_setup(dev, sensor_data);
+}
+
+static const struct wmi_device_id asus_wmi_id_table[] = {
+	{ ASUSWMI_MONITORING_GUID, NULL },
+	{ }
+};
+
+static struct wmi_driver asus_sensors_wmi_driver = {
+	.driver = {
+		.name = "asus_wmi_sensors",
+	},
+	.id_table = asus_wmi_id_table,
+	.probe = asus_wmi_probe,
+};
+module_wmi_driver(asus_sensors_wmi_driver);
+
+MODULE_AUTHOR("Ed Brindley <kernel@maidavale.org>");
+MODULE_DESCRIPTION("Asus WMI Sensors Driver");
+MODULE_LICENSE("GPL");
-- 
2.33.0

[PATCH v8 3/3] hwmon: (nct6775) Add ProArt X570-CREATOR WIFI support.

[Denis Pauk]

Tested on:
```
BIOS Information
    Vendor: American Megatrends Inc.
    Version: 0402
    Release Date: 08/04/2021
```

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Tested-by: Joel Wirāmu Pauling <jwp@redhat.com>

---
Changes in v8:
- Add ProArt X570 support.
---
 drivers/hwmon/nct6775.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index f345e1902ad9..93dca471972e 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -4986,6 +4986,7 @@ static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
 static struct platform_device *pdev[2];
 
 static const char * const asus_wmi_boards[] = {
+	"ProArt X570-CREATOR WIFI",
 	"Pro WS X570-ACE",
 	"PRIME B360-PLUS",
 	"PRIME B460-PLUS",
-- 
2.33.0

Re: [PATCH v8 0/3] Update ASUS WMI supported boards

[Andy Shevchenko]

On Fri, Oct 22, 2021 at 11:01 PM Denis Pauk <pauk.denis@gmail.com> wrote:
>
> Update ASUS WMI supported boards
>
> Add support by WMI interface privided by Asus for B550/X570 boards:

provided

> * PRIME X570-PRO,
> * ROG CROSSHAIR VIII HERO
> * ROG CROSSHAIR VIII DARK HERO
> * ROG CROSSHAIR VIII FORMULA
> * ROG STRIX X570-E GAMING
> * ROG STRIX B550-E GAMING
>
> Add support by WMI interface privided by Asus for X370/X470/

provided

> B450/X399 boards:
> * ROG CROSSHAIR VI HERO,
> * PRIME X399-A,
> * PRIME X470-PRO,
> * ROG CROSSHAIR VI EXTREME,
> * ROG CROSSHAIR VI HERO (WI-FI AC),
> * ROG CROSSHAIR VII HERO,
> * ROG CROSSHAIR VII HERO (WI-FI),
> * ROG STRIX B450-E GAMING,
> * ROG STRIX B450-F GAMING,
> * ROG STRIX B450-I GAMING,
> * ROG STRIX X399-E GAMING,
> * ROG STRIX X470-F GAMING,
> * ROG STRIX X470-I GAMING,
> * ROG ZENITH EXTREME,
> * ROG ZENITH EXTREME ALPHA.
>
> Add support to nct6775:
> * ProArt X570-CREATOR WIFI.
>
> Could you please review?

> Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
> Signed-off-by: Ed Brindley <kernel@maidavale.org>
> Signed-off-by: Eugene Shalygin <eugene.shalygin@gmail.com>

No need to have this in cover letter. But it's harmless, so up to you.

I will look at it this week, I think we can still improve utf conversion code.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v8 3/3] hwmon: (nct6775) Add ProArt X570-CREATOR WIFI support.

[Guenter Roeck]

On Fri, Oct 22, 2021 at 11:00:31PM +0300, Denis Pauk wrote:
> Tested on:
> ```
> BIOS Information
>     Vendor: American Megatrends Inc.
>     Version: 0402
>     Release Date: 08/04/2021
> ```
> 

This is not an appropriate patch description. Also. it should be an independent
patch and not be tied to the other patches of the series.

Guenter

> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204807
> Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
> Tested-by: Joel Wirāmu Pauling <jwp@redhat.com>
> 
> ---
> Changes in v8:
> - Add ProArt X570 support.
> ---
>  drivers/hwmon/nct6775.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
> index f345e1902ad9..93dca471972e 100644
> --- a/drivers/hwmon/nct6775.c
> +++ b/drivers/hwmon/nct6775.c
> @@ -4986,6 +4986,7 @@ static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
>  static struct platform_device *pdev[2];
>  
>  static const char * const asus_wmi_boards[] = {
> +	"ProArt X570-CREATOR WIFI",
>  	"Pro WS X570-ACE",
>  	"PRIME B360-PLUS",
>  	"PRIME B460-PLUS",
> -- 
> 2.33.0
> 

Re: [PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Guenter Roeck]

On Fri, Oct 22, 2021 at 11:00:29PM +0300, Denis Pauk wrote:
> Linux HWMON sensors driver for ASUS motherboards to read
> sensors from the embedded controller.
> 
> Many ASUS motherboards do not publish all the available
> sensors via the Super I/O chip but the missing ones are
> available through the embedded controller (EC) registers.
> 
> This driver implements reading those sensor data via the
> WMI method BREC, which is known to be present in all ASUS
> motherboards based on the AMD 500 series chipsets (and
> probably is available in other models too). The driver
> needs to know exact register addresses for the sensors and
> thus support for each motherboard has to be added explicitly.
> 
> The EC registers do not provide critical values for the
> sensors and as such they are not published to the HWMON.
> 
> Supported motherboards:
> * PRIME X570-PRO
> * Pro WS X570-ACE
> * ROG CROSSHAIR VIII HERO
> * ROG CROSSHAIR VIII DARK HERO
> * ROG CROSSHAIR VIII FORMULA
> * ROG STRIX X570-E GAMING
> * ROG STRIX B550-E GAMING
> 
> Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
> Co-developed-by: Eugene Shalygin <eugene.shalygin@gmail.com>
> Signed-off-by: Eugene Shalygin <eugene.shalygin@gmail.com>
> Tested-by: Tor Vic <torvic9@mailbox.org>
> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
> 
> ---
> Changes in v8:
> - Fix codestyle in defines and comments.
> - Fix buffer length calculation.
> - Use hex2bin/bin2hex for convert values in buffers.
> - Remove unrequired acpi_os_free usage.
> - Call mutex_lock inside of functions.
> 
> Changes in v7:
> - Use dmi_first_match for directly get sensors list by board.
> - Add depends on ACPI_WMI to Kconfig.
> - Add response buffer size check in asus_wmi_ec_decode_reply_buffer.
> - Clean up defines names.
> 
> Changes in v6:
> - Generate query for all sensors on sensors setup
> - Move binary to sensor value logic to separate get_sensor_value
>   (by Eugene Shalygin)
> - Add asus_wmi_ec_sensor to documentation index.
> - Use acpi_os_free without NULL pointer check.
> 
> Changes in v5:
> - Fixes build issue reported by kernel test robot with disabled ACPI_WMI.
> 
> Changes in v4:
>  - implement wmi driver instead platform driver.
> 
> Changes in v3:
>  - Use MODULE_DEVICE_TABLE for match devices.
>  - Use get_unaligned_be32 instead incorrectly used get_unaligned_le32.
>  - Add documentaion for driver.
> 
> Changes in v2:
>  - Use utf8s_to_utf16s/utf16s_to_utf8s instead handmade fuctions.
>  - Use post increment.
>  - Use get_unaligned* for convert values.
>  - Use PTR_ERR_OR_ZERO.
>  - Specify per-board sensors in a declarative way (by Eugene Shalygin).
> ---
>  Documentation/hwmon/asus_wmi_ec_sensors.rst |  35 ++
>  Documentation/hwmon/index.rst               |   1 +
>  MAINTAINERS                                 |   7 +
>  drivers/hwmon/Kconfig                       |  12 +
>  drivers/hwmon/Makefile                      |   1 +
>  drivers/hwmon/asus_wmi_ec_sensors.c         | 618 ++++++++++++++++++++
>  6 files changed, 674 insertions(+)
>  create mode 100644 Documentation/hwmon/asus_wmi_ec_sensors.rst
>  create mode 100644 drivers/hwmon/asus_wmi_ec_sensors.c
> 
> diff --git a/Documentation/hwmon/asus_wmi_ec_sensors.rst b/Documentation/hwmon/asus_wmi_ec_sensors.rst
> new file mode 100644
> index 000000000000..7edf08579baa
> --- /dev/null
> +++ b/Documentation/hwmon/asus_wmi_ec_sensors.rst
> @@ -0,0 +1,35 @@
> +Kernel driver asus_wmi_ec_sensors
> +=================================
> +
> +Supported boards:
> + * PRIME X570-PRO,
> + * Pro WS X570-ACE,
> + * ROG CROSSHAIR VIII DARK HERO,
> + * ROG CROSSHAIR VIII FORMULA,
> + * ROG CROSSHAIR VIII HERO,
> + * ROG STRIX B550-E GAMING,
> + * ROG STRIX X570-E GAMING.
> +
> +Authors:
> +    - Eugene Shalygin <eugene.shalygin@gmail.com>
> +
> +Description:
> +------------
> +ASUS mainboards publish hardware monitoring information via Super I/O
> +chip and the ACPI embedded controller (EC) registers. Some of the sensors
> +are only available via the EC.
> +
> +ASUS WMI interface provides a method (BREC) to read data from EC registers,
> +which is utilized by this driver to publish those sensor readings to the
> +HWMON system. The driver is aware of and reads the following sensors:
> +
> +1. Chipset (PCH) temperature
> +2. CPU package temperature
> +3. Motherboard temperature
> +4. Readings from the T_Sensor header
> +5. VRM temperature
> +6. CPU_Opt fan RPM
> +7. Chipset fan RPM
> +8. Readings from the "Water flow meter" header (RPM)
> +9. Readings from the "Water In" and "Water Out" temperature headers
> +10. CPU current
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 7046bf1870d9..23deb1a1202f 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -43,6 +43,7 @@ Hardware Monitoring Kernel Drivers
>     asb100
>     asc7621
>     aspeed-pwm-tacho
> +   asus_wmi_ec_sensors
>     bcm54140
>     bel-pfe
>     bpa-rs600
> diff --git a/MAINTAINERS b/MAINTAINERS
> index cc5eaf4e65dc..05448435991d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2937,6 +2937,13 @@ W:	http://acpi4asus.sf.net
>  F:	drivers/platform/x86/asus*.c
>  F:	drivers/platform/x86/eeepc*.c
>  
> +ASUS WMI HARDWARE MONITOR DRIVER
> +M:	Eugene Shalygin <eugene.shalygin@gmail.com>
> +M:	Denis Pauk <pauk.denis@gmail.com>
> +L:	linux-hwmon@vger.kernel.org
> +S:	Maintained
> +F:	drivers/hwmon/asus_wmi_ec_sensors.c
> +
>  ASUS WIRELESS RADIO CONTROL DRIVER
>  M:	João Paulo Rechi Vita <jprvita@gmail.com>
>  L:	platform-driver-x86@vger.kernel.org
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 7fde4c6e1e7f..01b6338d70ff 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -2215,6 +2215,18 @@ config SENSORS_ATK0110
>  	  This driver can also be built as a module. If so, the module
>  	  will be called asus_atk0110.
>  
> +config SENSORS_ASUS_WMI_EC
> +	tristate "ASUS WMI B550/X570"
> +	depends on ACPI_WMI
> +	help
> +	  If you say yes here you get support for the ACPI embedded controller
> +	  hardware monitoring interface found in B550/X570 ASUS motherboards.
> +	  This driver will provide readings of fans, voltages and temperatures
> +	  through the system firmware.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called asus_wmi_sensors_ec.
> +
>  endif # ACPI
>  
>  endif # HWMON
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index baee6a8d4dd1..aae2ff5c7335 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_HWMON_VID)		+= hwmon-vid.o
>  # APCI drivers
>  obj-$(CONFIG_SENSORS_ACPI_POWER) += acpi_power_meter.o
>  obj-$(CONFIG_SENSORS_ATK0110)	+= asus_atk0110.o
> +obj-$(CONFIG_SENSORS_ASUS_WMI_EC)	+= asus_wmi_ec_sensors.o
>  
>  # Native drivers
>  # asb100, then w83781d go first, as they can override other drivers' addresses.
> diff --git a/drivers/hwmon/asus_wmi_ec_sensors.c b/drivers/hwmon/asus_wmi_ec_sensors.c
> new file mode 100644
> index 000000000000..87bd32487926
> --- /dev/null
> +++ b/drivers/hwmon/asus_wmi_ec_sensors.c
> @@ -0,0 +1,618 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * HWMON driver for ASUS B550/X570 motherboards that publish sensor
> + * values via the embedded controller registers.
> + *
> + * Copyright (C) 2021 Eugene Shalygin <eugene.shalygin@gmail.com>
> + * Copyright (C) 2018-2019 Ed Brindley <kernel@maidavale.org>
> + *
> + * EC provides:
> + * Chipset temperature,
> + * CPU temperature,
> + * Motherboard temperature,
> + * T_Sensor temperature,
> + * VRM  temperature,
> + * Water In temperature,
> + * Water Out temperature,
> + * CPU Optional Fan RPM,
> + * Chipset Fan RPM,
> + * Water Flow Fan RPM,
> + * CPU current.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/dmi.h>
> +#include <linux/init.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/nls.h>
> +#include <linux/units.h>
> +#include <linux/wmi.h>
> +#include <asm/unaligned.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +
> +#define ASUSWMI_MONITORING_GUID	"466747A0-70EC-11DE-8A39-0800200C9A66"
> +#define ASUSWMI_METHODID_BLOCK_READ_EC	0x42524543 /* BREC */
> +/* From the ASUS DSDT source */
> +#define ASUSWMI_BREC_REGISTERS_MAX	0x10
> +#define ASUSWMI_MAX_BUF_LEN	0x80
> +#define SENSOR_LABEL_LEN	0x10
> +
> +static u32 hwmon_attributes[] = {
> +	[hwmon_chip] = HWMON_C_REGISTER_TZ,
> +	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
> +	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
> +	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
> +	[hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
> +};
> +
> +struct asus_wmi_ec_sensor_address {
> +	u8 index;
> +	u8 bank;
> +	u8 size;
> +};
> +
> +#define MAKE_SENSOR_ADDRESS(size_i, bank_i, index_i) {	\
> +	.size = size_i,					\
> +	.bank = bank_i,					\
> +	.index = index_i				\
> +}
> +
> +struct ec_sensor_info {
> +	char label[SENSOR_LABEL_LEN];
> +	enum hwmon_sensor_types type;
> +	struct asus_wmi_ec_sensor_address addr;
> +};
> +
> +#define EC_SENSOR(sensor_label, sensor_type, size, bank, index) {	\
> +	.label = sensor_label,						\
> +	.type = sensor_type,						\
> +	.addr = MAKE_SENSOR_ADDRESS(size, bank, index)			\
> +}
> +
> +enum known_ec_sensor {
> +	SENSOR_TEMP_CHIPSET,
> +	SENSOR_TEMP_CPU,
> +	SENSOR_TEMP_MB,
> +	SENSOR_TEMP_T_SENSOR,
> +	SENSOR_TEMP_VRM,
> +	SENSOR_FAN_CPU_OPT,
> +	SENSOR_FAN_CHIPSET,
> +	SENSOR_FAN_WATER_FLOW,
> +	SENSOR_CURR_CPU,
> +	SENSOR_TEMP_WATER_IN,
> +	SENSOR_TEMP_WATER_OUT,
> +	SENSOR_MAX
> +};
> +
> +/* All known sensors for ASUS EC controllers */
> +static const struct ec_sensor_info known_ec_sensors[] = {
> +	[SENSOR_TEMP_CHIPSET] = EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
> +	[SENSOR_TEMP_CPU] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
> +	[SENSOR_TEMP_MB] = EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
> +	[SENSOR_TEMP_T_SENSOR] = EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
> +	[SENSOR_TEMP_VRM] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
> +	[SENSOR_FAN_CPU_OPT] = EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
> +	[SENSOR_FAN_CHIPSET] = EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4),
> +	[SENSOR_FAN_WATER_FLOW] = EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
> +	[SENSOR_CURR_CPU] = EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
> +	[SENSOR_TEMP_WATER_IN] = EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
> +	[SENSOR_TEMP_WATER_OUT] = EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
> +};
> +
> +struct asus_wmi_data {
> +	const enum known_ec_sensor known_board_sensors[SENSOR_MAX + 1];
> +};
> +
> +/* boards with EC support */
> +static struct asus_wmi_data sensors_board_PW_X570_P = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB, SENSOR_TEMP_VRM,
> +		SENSOR_FAN_CHIPSET,
> +		SENSOR_MAX
> +	},
> +};
> +
> +static struct asus_wmi_data sensors_board_PW_X570_A = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB, SENSOR_TEMP_VRM,
> +		SENSOR_FAN_CHIPSET,
> +		SENSOR_CURR_CPU,
> +		SENSOR_MAX
> +	},
> +};
> +
> +static struct asus_wmi_data sensors_board_R_C8H = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
> +		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
> +		SENSOR_TEMP_WATER_IN, SENSOR_TEMP_WATER_OUT,
> +		SENSOR_FAN_CPU_OPT, SENSOR_FAN_CHIPSET, SENSOR_FAN_WATER_FLOW,
> +		SENSOR_CURR_CPU,
> +		SENSOR_MAX
> +	},
> +};
> +
> +/* Same as Hero but without chipset fan */
> +static struct asus_wmi_data sensors_board_R_C8DH = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
> +		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
> +		SENSOR_TEMP_WATER_IN, SENSOR_TEMP_WATER_OUT,
> +		SENSOR_FAN_CPU_OPT, SENSOR_FAN_WATER_FLOW,
> +		SENSOR_CURR_CPU,
> +		SENSOR_MAX
> +	},
> +};
> +
> +/* Same as Hero but without water */
> +static struct asus_wmi_data sensors_board_R_C8F = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
> +		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
> +		SENSOR_FAN_CPU_OPT, SENSOR_FAN_CHIPSET,
> +		SENSOR_CURR_CPU,
> +		SENSOR_MAX
> +	},
> +};
> +
> +static struct asus_wmi_data sensors_board_RS_B550_E_G = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
> +		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
> +		SENSOR_FAN_CPU_OPT,
> +		SENSOR_MAX
> +	},
> +};
> +
> +static struct asus_wmi_data sensors_board_RS_X570_E_G = {
> +	.known_board_sensors = {
> +		SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
> +		SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
> +		SENSOR_FAN_CHIPSET,
> +		SENSOR_CURR_CPU,
> +		SENSOR_MAX
> +	},
> +};
> +
> +#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name, sensors) {	\
> +	.matches = {						\
> +		DMI_EXACT_MATCH(DMI_BOARD_VENDOR,		\
> +				"ASUSTeK COMPUTER INC."),	\
> +		DMI_EXACT_MATCH(DMI_BOARD_NAME, name),		\
> +	},							\
> +	.driver_data = sensors,					\
> +}
> +
> +static const struct dmi_system_id asus_wmi_ec_dmi_table[] = {
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X570-PRO", &sensors_board_PW_X570_P),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("Pro WS X570-ACE", &sensors_board_PW_X570_A),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII DARK HERO", &sensors_board_R_C8DH),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII FORMULA", &sensors_board_R_C8F),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII HERO", &sensors_board_R_C8H),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B550-E GAMING", &sensors_board_RS_B550_E_G),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-E GAMING", &sensors_board_RS_X570_E_G),
> +	{}
> +};
> +MODULE_DEVICE_TABLE(dmi, asus_wmi_ec_dmi_table);
> +
> +struct ec_sensor {
> +	enum known_ec_sensor info_index;
> +	u32 cached_value;
> +};
> +
> +/**
> + * struct asus_wmi_ec_info - sensor info.
> + * @sensors: list of sensors.
> + * @read_arg: UTF-16 string to pass to BRxx() WMI function.
> + * @read_buffer: decoded output from WMI result.
> + * @nr_sensors: number of board EC sensors.
> + * @nr_registers: number of EC registers to read (sensor might span more than
> + *                         1 register).
> + * @last_updated: in jiffies.
> + */
> +struct asus_wmi_ec_info {
> +	struct ec_sensor sensors[SENSOR_MAX];
> +	char read_arg[(ASUSWMI_BREC_REGISTERS_MAX * 4 + 1) * 2];
> +	u8 read_buffer[ASUSWMI_BREC_REGISTERS_MAX];
> +	unsigned int nr_sensors;
> +	unsigned int nr_registers;
> +	unsigned long last_updated;
> +};
> +
> +struct asus_wmi_sensors {
> +	/* lock access to internal cache */
> +	struct mutex lock;
> +	struct asus_wmi_ec_info ec;
> +};
> +
> +static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
> +					  const enum known_ec_sensor *bsi)
> +{
> +	struct ec_sensor *s = ec->sensors;
> +	int i;
> +
> +	ec->nr_sensors = 0;
> +	ec->nr_registers = 0;
> +
> +	for (i = 0; i < SENSOR_MAX && bsi[i] != SENSOR_MAX; i++) {
> +		s[i].info_index = bsi[i];
> +		ec->nr_sensors++;
> +		ec->nr_registers += known_ec_sensors[bsi[i]].addr.size;
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * The next four functions converts to/from BRxx string argument format.
> + * The format of the string is as follows:
> + * * The string consists of two-byte UTF-16 characters.
> + * * The value of the very first byte int the string is equal to the total
> + *   length of the next string in bytes, thus excluding the first two-byte
> + *   character.
> + * * The rest of the string encodes pairs of (bank, index) pairs, where both
> + *   values are byte-long (0x00 to 0xFF).
> + * * Numbers are encoded as UTF-16 hex values.
> + */
> +static int asus_wmi_ec_decode_reply_buffer(const u8 *inp, u8 *out, u32 length)
> +{
> +	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
> +	const char *pos = buffer;
> +	const u8 *data = inp + 2;
> +	u32 len;
> +
> +	/* Minimum of size of response and size of ACPI result*/
> +	len = min_t(u32, inp[0] / 4, (length - 2) / 4);
> +	len = min_t(u32, len, ASUSWMI_MAX_BUF_LEN);
> +
> +	utf16s_to_utf8s((wchar_t *)data, len * 2,  UTF16_LITTLE_ENDIAN, buffer, len * 2);
> +
> +	return hex2bin(out, pos, len);
> +}
> +
> +static void asus_wmi_ec_encode_registers(const u16 *registers, u8 len, char *out)
> +{
> +	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
> +	char *pos = buffer;
> +	unsigned int i;
> +	u8 byte;
> +
> +	*out++ = len * 8;
> +	*out++ = 0;
> +
> +	for (i = 0; i < len; i++) {
> +		byte = registers[i] >> 8;
> +		pos = bin2hex(pos, &byte, 1);
> +		byte = registers[i];
> +		pos = bin2hex(pos, &byte, 1);
> +	}
> +
> +	utf8s_to_utf16s(buffer, len * 4, UTF16_LITTLE_ENDIAN, (wchar_t *)out, len * 4);
> +}
> +
> +static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
> +{
> +	u16 registers[ASUSWMI_BREC_REGISTERS_MAX];
> +	const struct ec_sensor_info *si;
> +	int i, j, register_idx = 0;
> +
> +	for (i = 0; i < ec->nr_sensors; i++) {
> +		si = &known_ec_sensors[ec->sensors[i].info_index];
> +		for (j = 0; j < si->addr.size; j++, register_idx++)
> +			registers[register_idx] = (si->addr.bank << 8) + si->addr.index + j;
> +	}
> +
> +	asus_wmi_ec_encode_registers(registers, ec->nr_registers, ec->read_arg);
> +}
> +
> +static int asus_wmi_ec_block_read(u32 method_id, char *query, u8 *out)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	struct acpi_buffer input;
> +	union acpi_object *obj;
> +	acpi_status status;
> +
> +	/* The first byte of the BRxx() argument string has to be the string size. */
> +	input.length = query[0] + 2;
> +	input.pointer = query;
> +	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
> +				     method_id, &input, &output);

Presumably wmi_evaluate_method() allocates the response bufer since
ACPI_ALLOCATE_BUFFER is set. How is it released ? If there is some
infrastructure magic involved here, it should be documented in a comment,
especially since other similar code does release the buffer, and I don't
immediately see how this code is different.

/* releasing the buffer is not needed because that is handed in ... */

> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 2)
> +		return -EIO;
> +
> +	return asus_wmi_ec_decode_reply_buffer(obj->buffer.pointer, out, obj->buffer.length);
> +}
> +
> +static inline u32 get_sensor_value(const struct ec_sensor_info *si, u8 *data)
> +{
> +	switch (si->addr.size) {
> +	case 1:
> +		return *data;
> +	case 2:
> +		return get_unaligned_be16(data);
> +	case 4:
> +		return get_unaligned_be32(data);
> +	default:
> +		return 0;
> +	}
> +}
> +
> +static void asus_wmi_ec_update_ec_sensors(struct asus_wmi_ec_info *ec)
> +{
> +	const struct ec_sensor_info *si;
> +	u8 i_sensor;
> +	struct ec_sensor *s;
> +	u8 *data;
> +
> +	data = ec->read_buffer;
> +	for (i_sensor = 0; i_sensor < ec->nr_sensors; i_sensor++) {
> +		s = &ec->sensors[i_sensor];
> +		si = &known_ec_sensors[s->info_index];
> +		s->cached_value = get_sensor_value(si, data);
> +		data += si->addr.size;
> +	}
> +}
> +
> +static int asus_wmi_ec_scale_sensor_value(u32 value, int data_type)
> +{
> +	switch (data_type) {
> +	case hwmon_curr:
> +	case hwmon_temp:
> +	case hwmon_in:
> +		return value * MILLI;
> +	default:
> +		return value;
> +	}
> +}
> +
> +static int asus_wmi_ec_find_sensor_index(const struct asus_wmi_ec_info *ec,
> +					 enum hwmon_sensor_types type, int channel)
> +{
> +	int i;
> +
> +	for (i = 0; i < ec->nr_sensors; i++) {
> +		if (known_ec_sensors[ec->sensors[i].info_index].type == type) {
> +			if (channel == 0)
> +				return i;
> +
> +			channel--;
> +		}
> +	}
> +	return -EINVAL;
> +}
> +
> +static int asus_wmi_ec_get_cached_value_or_update(int sensor_index,
> +						  struct asus_wmi_sensors *state,
> +						  u32 *value)
> +{
> +	int ret;
> +
> +	mutex_lock(&state->lock);
> +
> +	if (time_after(jiffies, state->ec.last_updated + HZ)) {
> +		ret = asus_wmi_ec_block_read(ASUSWMI_METHODID_BLOCK_READ_EC,
> +					     state->ec.read_arg,
> +					     state->ec.read_buffer);
> +		if (ret) {
> +			mutex_unlock(&state->lock);
> +			return ret;
> +		}

Why not follow coding style guidelines ?

	int ret = 0;
	...
		if (ret)
			goto unlock:

> +
> +		asus_wmi_ec_update_ec_sensors(&state->ec);
> +		state->ec.last_updated = jiffies;
> +	}
> +
> +	*value = state->ec.sensors[sensor_index].cached_value;
> +
unlock:
> +	mutex_unlock(&state->lock);
> +
> +	return 0;
> +}
> +
> +/* Now follow the functions that implement the hwmon interface */
> +
> +static int asus_wmi_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
> +				  u32 attr, int channel, long *val)
> +{
> +	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
> +	int ret, sidx, info_index;
> +	u32 value = 0;
> +
> +	sidx = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
> +	if (sidx < 0)
> +		return sidx;
> +
> +	ret = asus_wmi_ec_get_cached_value_or_update(sidx, sensor_data, &value);
> +	if (ret)
> +		return ret;
> +
> +	info_index = sensor_data->ec.sensors[sidx].info_index;
> +	*val = asus_wmi_ec_scale_sensor_value(value,
> +					      known_ec_sensors[info_index].type);
> +
> +	return ret;
> +}
> +
> +static int asus_wmi_ec_hwmon_read_string(struct device *dev,
> +					 enum hwmon_sensor_types type, u32 attr,
> +					 int channel, const char **str)
> +{
> +	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
> +	int sensor_index;
> +
> +	sensor_index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
> +	*str = known_ec_sensors[sensor_data->ec.sensors[sensor_index].info_index].label;
> +
> +	return 0;
> +}
> +
> +static umode_t asus_wmi_ec_hwmon_is_visible(const void *drvdata,
> +					    enum hwmon_sensor_types type, u32 attr,
> +					    int channel)
> +{
> +	const struct asus_wmi_sensors *sensor_data = drvdata;
> +	int index;
> +
> +	index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
> +
> +	return index < 0 ? 0 : 0444;
> +}
> +
> +static int asus_wmi_hwmon_add_chan_info(struct hwmon_channel_info *asus_wmi_hwmon_chan,
> +					struct device *dev, int num,
> +					enum hwmon_sensor_types type, u32 config)
> +{
> +	u32 *cfg;
> +
> +	cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
> +	if (!cfg)
> +		return -ENOMEM;
> +
> +	asus_wmi_hwmon_chan->type = type;
> +	asus_wmi_hwmon_chan->config = cfg;
> +	memset32(cfg, config, num);
> +
> +	return 0;
> +}
> +
> +static const struct hwmon_ops asus_wmi_ec_hwmon_ops = {
> +	.is_visible = asus_wmi_ec_hwmon_is_visible,
> +	.read = asus_wmi_ec_hwmon_read,
> +	.read_string = asus_wmi_ec_hwmon_read_string,
> +};
> +
> +static struct hwmon_chip_info asus_wmi_ec_chip_info = {
> +	.ops = &asus_wmi_ec_hwmon_ops,
> +};
> +
> +static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
> +					      struct asus_wmi_sensors *sensor_data,
> +					      const enum known_ec_sensor *bsi)
> +{
> +	struct hwmon_channel_info *asus_wmi_hwmon_chan;
> +	const struct hwmon_channel_info **ptr_asus_wmi_ci;
> +	int nr_count[hwmon_max] = {}, nr_types = 0;
> +	const struct hwmon_chip_info *chip_info;
> +	const struct ec_sensor_info *si;
> +	enum hwmon_sensor_types type;
> +	struct device *hwdev;
> +	int i, ret;
> +
> +	ret = asus_wmi_ec_fill_board_sensors(&sensor_data->ec, bsi);
> +	if (ret)
> +		return ret;
> +
> +	if (!sensor_data->ec.nr_sensors)
> +		return -ENODEV;
> +
> +	for (i = 0; i < sensor_data->ec.nr_sensors; i++) {
> +		si = &known_ec_sensors[sensor_data->ec.sensors[i].info_index];
> +		if (!nr_count[si->type])
> +			nr_types++;
> +		nr_count[si->type]++;
> +	}
> +
> +	if (nr_count[hwmon_temp]) {
> +		nr_count[hwmon_chip]++;
> +		nr_types++;
> +	}
> +
> +	/*
> +	 * If we can get values for all the registers in a single query,
> +	 * the query will not change from call to call.
> +	 */
> +	asus_wmi_ec_make_block_read_query(&sensor_data->ec);
> +
> +	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types,
> +					   sizeof(*asus_wmi_hwmon_chan),
> +					   GFP_KERNEL);
> +	if (!asus_wmi_hwmon_chan)
> +		return -ENOMEM;
> +
> +	ptr_asus_wmi_ci = devm_kcalloc(dev, nr_types + 1,
> +				       sizeof(*ptr_asus_wmi_ci), GFP_KERNEL);
> +	if (!ptr_asus_wmi_ci)
> +		return -ENOMEM;
> +
> +	asus_wmi_ec_chip_info.info = ptr_asus_wmi_ci;
> +	chip_info = &asus_wmi_ec_chip_info;
> +
> +	for (type = 0; type < hwmon_max; type++) {
> +		if (!nr_count[type])
> +			continue;
> +
> +		ret = asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
> +						   nr_count[type], type,
> +						   hwmon_attributes[type]);
> +		if (ret)
> +			return ret;
> +
> +		*ptr_asus_wmi_ci++ = asus_wmi_hwmon_chan++;
> +	}
> +
> +	dev_dbg(dev, "board has %d EC sensors that span %d registers",
> +		sensor_data->ec.nr_sensors,
> +		sensor_data->ec.nr_registers);
> +
> +	hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_ec_sensors",
> +						     sensor_data, chip_info, NULL);
> +
> +	return PTR_ERR_OR_ZERO(hwdev);
> +}
> +
> +static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
> +{
> +	struct asus_wmi_sensors *sensor_data;
> +	struct asus_wmi_data *board_sensors;
> +	const enum known_ec_sensor *bsi;
> +	const struct dmi_system_id *dmi_id;
> +	struct device *dev = &wdev->dev;
> +
> +	dmi_id = dmi_first_match(asus_wmi_ec_dmi_table);
> +	if (!dmi_id)
> +		return -ENODEV;
> +
> +	board_sensors = dmi_id->driver_data;
> +	if (!board_sensors)
> +		return -ENODEV;
> +
> +	bsi = board_sensors->known_board_sensors;
> +
> +	sensor_data = devm_kzalloc(dev, sizeof(*sensor_data), GFP_KERNEL);
> +	if (!sensor_data)
> +		return -ENOMEM;
> +
> +	mutex_init(&sensor_data->lock);
> +
> +	dev_set_drvdata(dev, sensor_data);
> +
> +	return asus_wmi_ec_configure_sensor_setup(dev,
> +						  sensor_data, bsi);
> +}
> +
> +static const struct wmi_device_id asus_ec_wmi_id_table[] = {
> +	{ ASUSWMI_MONITORING_GUID, NULL },
> +	{ }
> +};
> +
> +static struct wmi_driver asus_sensors_wmi_driver = {
> +	.driver = {
> +		.name = "asus_wmi_ec_sensors",
> +	},
> +	.id_table = asus_ec_wmi_id_table,
> +	.probe = asus_wmi_probe,
> +};
> +module_wmi_driver(asus_sensors_wmi_driver);
> +
> +MODULE_AUTHOR("Ed Brindley <kernel@maidavale.org>");
> +MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@gmail.com>");
> +MODULE_DESCRIPTION("Asus WMI Sensors Driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.33.0
> 

Re: [PATCH v8 2/3] hwmon: (asus_wmi_sensors) Support X370 Asus WMI.

[Guenter Roeck]

On 10/22/21 1:00 PM, Denis Pauk wrote:
> Provides a Linux kernel module "asus_wmi_sensors" that provides sensor
> readouts via ASUS' WMI interface present in the UEFI of
> X370/X470/B450/X399 Ryzen motherboards.
> 
> Supported motherboards:
> * ROG CROSSHAIR VI HERO,
> * PRIME X399-A,
> * PRIME X470-PRO,
> * ROG CROSSHAIR VI EXTREME,
> * ROG CROSSHAIR VI HERO (WI-FI AC),
> * ROG CROSSHAIR VII HERO,
> * ROG CROSSHAIR VII HERO (WI-FI),
> * ROG STRIX B450-E GAMING,
> * ROG STRIX B450-F GAMING,
> * ROG STRIX B450-I GAMING,
> * ROG STRIX X399-E GAMING,
> * ROG STRIX X470-F GAMING,
> * ROG STRIX X470-I GAMING,
> * ROG ZENITH EXTREME,
> * ROG ZENITH EXTREME ALPHA.
> 
> Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
> Co-developed-by: Ed Brindley <kernel@maidavale.org>
> Signed-off-by: Ed Brindley <kernel@maidavale.org>
> 
> ---
> Changes in v8:
> - Fix codestyle in defines and comments.
> - Call mutex_lock inside of functions.
> 
> Changes in v7:
> - Add depends on ACPI_WMI to Kconfig.
> - Clean up defines names.
> 
> Changes in v6:
> - Add asus_wmi_sensor to documentation index.
> 
> Changes in v5:
> - Fixes build issue reported by kernel test robot with disabled ACPI_WMI.
> - Remove sensor->name check as always eevaluated to true.
> 
> Changes in v4:
> - Implement wmi driver instead platform driver.
> - Update documentation.
> 
> Changes in v3:
> - Use MODULE_DEVICE_TABLE for match devices.
> - Add documentaion for driver.
> 
> Changes in v2:
> - Add module for boards with support of WMI interface returned sensor name and
>    value of sensor..
> ---
>   Documentation/hwmon/asus_wmi_sensors.rst |  74 +++
>   Documentation/hwmon/index.rst            |   1 +
>   MAINTAINERS                              |   1 +
>   drivers/hwmon/Kconfig                    |  12 +
>   drivers/hwmon/Makefile                   |   1 +
>   drivers/hwmon/asus_wmi_sensors.c         | 616 +++++++++++++++++++++++
>   6 files changed, 705 insertions(+)
>   create mode 100644 Documentation/hwmon/asus_wmi_sensors.rst
>   create mode 100644 drivers/hwmon/asus_wmi_sensors.c
> 
> diff --git a/Documentation/hwmon/asus_wmi_sensors.rst b/Documentation/hwmon/asus_wmi_sensors.rst
> new file mode 100644
> index 000000000000..cc88adc8915f
> --- /dev/null
> +++ b/Documentation/hwmon/asus_wmi_sensors.rst
> @@ -0,0 +1,74 @@
> +Kernel driver asus_wmi_sensors
> +=================================
> +
> +Supported boards:
> + * PRIME X399-A,
> + * PRIME X470-PRO,
> + * ROG CROSSHAIR VI EXTREME,
> + * ROG CROSSHAIR VI HERO,
> + * ROG CROSSHAIR VI HERO (WI-FI AC),
> + * ROG CROSSHAIR VII HERO,
> + * ROG CROSSHAIR VII HERO (WI-FI),
> + * ROG STRIX B450-E GAMING,
> + * ROG STRIX B450-F GAMING,
> + * ROG STRIX B450-I GAMING,
> + * ROG STRIX X399-E GAMING,
> + * ROG STRIX X470-F GAMING,
> + * ROG STRIX X470-I GAMING,
> + * ROG ZENITH EXTREME,
> + * ROG ZENITH EXTREME ALPHA.
> +
> +Authors:
> +    - Ed Brindley <kernel@maidavale.org>
> +
> +Description:
> +------------
> +ASUS mainboards publish hardware monitoring information via WMI interface.
> +
> +ASUS WMI interface provides a methods to get list of sensors and values of
> +such, which is utilized by this driver to publish those sensor readings to the
> +HWMON system. The driver is aware of and reads the following sensors:
> + * CPU Core Voltage,
> + * CPU SOC Voltage,
> + * DRAM Voltage,
> + * VDDP Voltage,
> + * 1.8V PLL Voltage,
> + * +12V Voltage,
> + * +5V Voltage,
> + * 3VSB Voltage,
> + * VBAT Voltage,
> + * AVCC3 Voltage,
> + * SB 1.05V Voltage,
> + * CPU Core Voltage,
> + * CPU SOC Voltage,
> + * DRAM Voltage,
> + * CPU Fan RPM,
> + * Chassis Fan 1 RPM,
> + * Chassis Fan 2 RPM,
> + * Chassis Fan 3 RPM,
> + * HAMP Fan RPM,
> + * Water Pump RPM,
> + * CPU OPT RPM,
> + * Water Flow RPM,
> + * AIO Pump RPM,
> + * CPU Temperature,
> + * CPU Socket Temperature,
> + * Motherboard Temperature,
> + * Chipset Temperature,
> + * Tsensor 1 Temperature,
> + * CPU VRM Temperature,
> + * Water In,
> + * Water Out,
> + * CPU VRM Output Current.
> +
> +Known Issues:
> +* The WMI implementation in some of Asus' BIOSes is buggy. This can result in
> +   fans stopping, fans getting stuck at max speed, or temperature readouts
> +   getting stuck. This is not an issue with the driver, but the BIOS. The Prime
> +   X470 Pro seems particularly bad for this. The more frequently the WMI
> +   interface is polled the greater the potential for this to happen. Until you
> +   have subjected your computer to an extended soak test while polling the
> +   sensors frequently, don't leave you computer unattended. Upgrading to new
> +   BIOS version with method version greater than or equal to two should
> +   rectify the issue.
> +* A few boards report 12v voltages to be ~10v.
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 23deb1a1202f..6dca9df9d24a 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -44,6 +44,7 @@ Hardware Monitoring Kernel Drivers
>      asc7621
>      aspeed-pwm-tacho
>      asus_wmi_ec_sensors
> +   asus_wmi_sensors
>      bcm54140
>      bel-pfe
>      bpa-rs600
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 05448435991d..46036c184330 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2943,6 +2943,7 @@ M:	Denis Pauk <pauk.denis@gmail.com>
>   L:	linux-hwmon@vger.kernel.org
>   S:	Maintained
>   F:	drivers/hwmon/asus_wmi_ec_sensors.c
> +F:	drivers/hwmon/asus_wmi_sensors.c
>   
>   ASUS WIRELESS RADIO CONTROL DRIVER
>   M:	João Paulo Rechi Vita <jprvita@gmail.com>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 01b6338d70ff..f4e53d02d3d7 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -2215,6 +2215,18 @@ config SENSORS_ATK0110
>   	  This driver can also be built as a module. If so, the module
>   	  will be called asus_atk0110.
>   
> +config SENSORS_ASUS_WMI
> +	tristate "ASUS WMI X370/X470/B450/X399"
> +	depends on ACPI_WMI
> +	help
> +	  If you say yes here you get support for the ACPI hardware monitoring
> +	  interface found in X370/X470/B450/X399 ASUS motherboards. This driver
> +	  will provide readings of fans, voltages and temperatures through the system
> +	  firmware.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called asus_wmi_sensors.
> +
>   config SENSORS_ASUS_WMI_EC
>   	tristate "ASUS WMI B550/X570"
>   	depends on ACPI_WMI
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index aae2ff5c7335..656a6191a0f8 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_HWMON_VID)		+= hwmon-vid.o
>   # APCI drivers
>   obj-$(CONFIG_SENSORS_ACPI_POWER) += acpi_power_meter.o
>   obj-$(CONFIG_SENSORS_ATK0110)	+= asus_atk0110.o
> +obj-$(CONFIG_SENSORS_ASUS_WMI)	+= asus_wmi_sensors.o
>   obj-$(CONFIG_SENSORS_ASUS_WMI_EC)	+= asus_wmi_ec_sensors.o
>   
>   # Native drivers
> diff --git a/drivers/hwmon/asus_wmi_sensors.c b/drivers/hwmon/asus_wmi_sensors.c
> new file mode 100644
> index 000000000000..45709b6cbbf5
> --- /dev/null
> +++ b/drivers/hwmon/asus_wmi_sensors.c
> @@ -0,0 +1,616 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * HWMON driver for ASUS motherboards that provides sensor readouts via WMI
> + * interface present in the UEFI of the X370/X470/B450/X399 Ryzen motherboards.
> + *
> + * Copyright (C) 2018-2019 Ed Brindley <kernel@maidavale.org>
> + *
> + * WMI interface provides:
> + * CPU Core Voltage,
> + * CPU SOC Voltage,
> + * DRAM Voltage,
> + * VDDP Voltage,
> + * 1.8V PLL Voltage,
> + * +12V Voltage,
> + * +5V Voltage,
> + * 3VSB Voltage,
> + * VBAT Voltage,
> + * AVCC3 Voltage,
> + * SB 1.05V Voltage,
> + * CPU Core Voltage,
> + * CPU SOC Voltage,
> + * DRAM Voltage,
> + * CPU Fan RPM,
> + * Chassis Fan 1 RPM,
> + * Chassis Fan 2 RPM,
> + * Chassis Fan 3 RPM,
> + * HAMP Fan RPM,
> + * Water Pump RPM,
> + * CPU OPT RPM,
> + * Water Flow RPM,
> + * AIO Pump RPM,
> + * CPU Temperature,
> + * CPU Socket Temperature,
> + * Motherboard Temperature,
> + * Chipset Temperature,
> + * Tsensor 1 Temperature,
> + * CPU VRM Temperature,
> + * Water In,
> + * Water Out,
> + * CPU VRM Output Current.
> + */
> +#include <linux/acpi.h>
> +#include <linux/dmi.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/init.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/units.h>
> +#include <linux/wmi.h>
> +
> +#define ASUSWMI_MONITORING_GUID	"466747A0-70EC-11DE-8A39-0800200C9A66"
> +#define ASUSWMI_METHODID_GET_VALUE	0x52574543 /* RWEC */
> +#define ASUSWMI_METHODID_UPDATE_BUFFER	0x51574543 /* QWEC */
> +#define ASUSWMI_METHODID_GET_INFO	0x50574543 /* PWEC */
> +#define ASUSWMI_METHODID_GET_NUMBER	0x50574572 /* PWEr */
> +#define ASUSWMI_METHODID_GET_VERSION	0x50574574 /* PWEt */
> +
> +#define ASUS_WMI_MAX_STR_SIZE	32
> +
> +#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name) {			\
> +	.matches = {						\
> +		DMI_EXACT_MATCH(DMI_BOARD_VENDOR,		\
> +				"ASUSTeK COMPUTER INC."),	\
> +		DMI_EXACT_MATCH(DMI_BOARD_NAME, name),		\
> +	},							\
> +}
> +
> +static const struct dmi_system_id asus_wmi_dmi_table[] = {
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X399-A"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X470-PRO"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI EXTREME"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI HERO"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VI HERO (WI-FI AC)"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VII HERO"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VII HERO (WI-FI)"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-E GAMING"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-F GAMING"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B450-I GAMING"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X399-E GAMING"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X470-F GAMING"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X470-I GAMING"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH EXTREME"),
> +	DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH EXTREME ALPHA"),
> +	{}
> +};
> +MODULE_DEVICE_TABLE(dmi, asus_wmi_dmi_table);
> +
> +enum asus_wmi_sensor_class {
> +	VOLTAGE = 0x0,
> +	TEMPERATURE_C = 0x1,
> +	FAN_RPM = 0x2,
> +	CURRENT = 0x3,
> +	WATER_FLOW = 0x4,
> +};
> +
> +enum asus_wmi_location {
> +	CPU = 0x0,
> +	CPU_SOC = 0x1,
> +	DRAM = 0x2,
> +	MOTHERBOARD = 0x3,
> +	CHIPSET = 0x4,
> +	AUX = 0x5,
> +	VRM = 0x6,
> +	COOLER = 0x7
> +};
> +
> +enum asus_wmi_type {
> +	SIGNED_INT = 0x0,
> +	UNSIGNED_INT = 0x1,
> +	SCALED = 0x3,
> +};
> +
> +enum asus_wmi_source {
> +	SIO = 0x1,
> +	EC = 0x2
> +};
> +
> +static enum hwmon_sensor_types asus_data_types[] = {
> +	[VOLTAGE] = hwmon_in,
> +	[TEMPERATURE_C] = hwmon_temp,
> +	[FAN_RPM] = hwmon_fan,
> +	[CURRENT] = hwmon_curr,
> +	[WATER_FLOW] = hwmon_fan,
> +};
> +
> +static u32 hwmon_attributes[] = {
> +	[hwmon_chip] = HWMON_C_REGISTER_TZ,
> +	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
> +	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
> +	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
> +	[hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
> +};
> +
> +/**
> + * struct asus_wmi_sensor_info - sensor info.
> + * @id: sensor id.
> + * @data_type: sensor class e.g. voltage, temp etc.
> + * @location: sensor location.
> + * @name: sensor name.
> + * @source: sensor source.
> + * @type: sensor type signed, unsigned etc.
> + * @cached_value: cached sensor value.
> + */
> +struct asus_wmi_sensor_info {
> +	u32 id;
> +	int data_type;
> +	int location;
> +	char name[ASUS_WMI_MAX_STR_SIZE];
> +	int source;
> +	int type;
> +	u32 cached_value;
> +};
> +
> +struct asus_wmi_wmi_info {
> +	u8 buffer;
> +	unsigned long source_last_updated[3];	/* in jiffies */
> +	int sensor_count;
> +
> +	const struct asus_wmi_sensor_info **info[hwmon_max];
> +	struct asus_wmi_sensor_info **info_by_id;
> +};
> +
> +struct asus_wmi_sensors {
> +	/* lock access to internal cache */
> +	struct mutex lock;
> +	struct asus_wmi_wmi_info wmi;
> +};
> +
> +/*
> + * Universal method for calling WMI method
> + */
> +static int asus_wmi_call_method(u32 method_id, u32 *args, struct acpi_buffer *output)
> +{
> +	struct acpi_buffer input = {(acpi_size) sizeof(*args), args };
> +	acpi_status status;
> +
> +	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
> +				     method_id, &input, output);
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	return 0;
> +}
> +
> +/*
> + * Gets the version of the ASUS sensors interface implemented
> + */
> +static int asus_wmi_get_version(u32 *version)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {0, 0, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_VERSION, args, &output);
> +	if (err)
> +		return err;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
> +		return -EIO;
> +
> +	*version = obj->integer.value;
> +
> +	return 0;
> +}
> +
> +/*
> + * Gets the number of sensor items
> + */
> +static int asus_wmi_get_item_count(u32 *count)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {0, 0, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_NUMBER, args, &output);
> +	if (err)
> +		return err;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
> +		return -EIO;
> +
> +	*count = obj->integer.value;
> +
> +	return 0;
> +}
> +
> +static int asus_wmi_hwmon_add_chan_info(struct hwmon_channel_info *asus_wmi_hwmon_chan,
> +					struct device *dev, int num,
> +					enum hwmon_sensor_types type, u32 config)
> +{
> +	u32 *cfg;
> +
> +	cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
> +	if (!cfg)
> +		return -ENOMEM;
> +
> +	asus_wmi_hwmon_chan->type = type;
> +	asus_wmi_hwmon_chan->config = cfg;
> +	memset32(cfg, config, num);
> +
> +	return 0;
> +}
> +
> +/*
> + * For a given sensor item returns details e.g. type (voltage/temperature/fan speed etc), bank etc
> + */
> +static int asus_wmi_sensor_info(int index, struct asus_wmi_sensor_info *s)
> +{
> +	union acpi_object name_obj, data_type_obj, location_obj, source_obj, type_obj;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {index, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_INFO, args, &output);
> +	if (err)
> +		return err;
> +
> +	s->id = index;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_PACKAGE)
> +		return -EIO;
> +
Similar to the other driver, it needs to be explained why it is not necessary to
release output.pointer even though ACPI_ALLOCATE_BUFFER is set.

> +	if (obj->package.count != 5)
> +		return 1;
> +
> +	name_obj = obj->package.elements[0];
> +
> +	if (name_obj.type != ACPI_TYPE_STRING)
> +		return 1;
> +
> +	strncpy(s->name, name_obj.string.pointer, sizeof(s->name) - 1);
> +
> +	data_type_obj = obj->package.elements[1];
> +
> +	if (data_type_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->data_type = data_type_obj.integer.value;
> +
> +	location_obj = obj->package.elements[2];
> +
> +	if (location_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->location = location_obj.integer.value;
> +
> +	source_obj = obj->package.elements[3];
> +
> +	if (source_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->source = source_obj.integer.value;
> +
> +	type_obj = obj->package.elements[4];
> +
> +	if (type_obj.type != ACPI_TYPE_INTEGER)
> +		return 1;
> +
> +	s->type = type_obj.integer.value;
> +
> +	return 0;
> +}
> +
> +static int asus_wmi_update_buffer(u8 source)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {source, 0};
> +
> +	return asus_wmi_call_method(ASUSWMI_METHODID_UPDATE_BUFFER, args, &output);
> +}
> +
> +static int asus_wmi_get_sensor_value(u8 index, u32 *value)
> +{
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	u32 args[] = {index, 0};
> +	union acpi_object *obj;
> +	int err;
> +
> +	err = asus_wmi_call_method(ASUSWMI_METHODID_GET_VALUE, args, &output);
> +	if (err)
> +		return err;
> +
> +	obj = output.pointer;
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
> +		return -EIO;
> +
> +	*value = obj->integer.value;
> +
> +	return 0;
> +}
> +
> +static void asus_wmi_update_values_for_source(u8 source, struct asus_wmi_sensors *sensor_data)
> +{
> +	struct asus_wmi_sensor_info *sensor;
> +	int value = 0;
> +	int ret = 0;
> +	int i;
> +
> +	for (i = 0; i < sensor_data->wmi.sensor_count; i++) {
> +		sensor = sensor_data->wmi.info_by_id[i];
> +		if (sensor && sensor->source == source) {
> +			ret = asus_wmi_get_sensor_value(sensor->id, &value);
> +			if (!ret)
> +				sensor->cached_value = value;

Errors are ignored ? That warrants an explanation.

> +		}
> +	}
> +}
> +
> +static int asus_wmi_scale_sensor_value(u32 value, int data_type)
> +{
> +	/* FAN_RPM and WATER_FLOW don't need scaling */
> +	switch (data_type) {
> +	case VOLTAGE:
> +		return DIV_ROUND_CLOSEST(value,  MILLI);

voltage is provided in uV ? Just asking.

> +	case TEMPERATURE_C:
> +		return value * MILLI;
> +	case CURRENT:
> +		return value * MILLI;
> +	}
> +	return value;
> +}
> +
> +static int asus_wmi_get_cached_value_or_update(const struct asus_wmi_sensor_info *sensor,
> +					       struct asus_wmi_sensors *sensor_data,
> +					       u32 *value)
> +{
> +	int ret;
> +
> +	mutex_lock(&sensor_data->lock);
> +
> +	if (time_after(jiffies, sensor_data->wmi.source_last_updated[sensor->source] + HZ)) {
> +		ret = asus_wmi_update_buffer(sensor->source);
> +		if (ret) {
> +			mutex_unlock(&sensor_data->lock);
> +			return -EIO;
> +		}
> +
> +		sensor_data->wmi.buffer = sensor->source;
> +
> +		asus_wmi_update_values_for_source(sensor->source, sensor_data);
> +		sensor_data->wmi.source_last_updated[sensor->source] = jiffies;
> +	}
> +
> +	*value = sensor->cached_value;
> +
> +	mutex_unlock(&sensor_data->lock);
> +
> +	return 0;
> +}
> +
> +/* Now follow the functions that implement the hwmon interface */
> +static int asus_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
> +			       u32 attr, int channel, long *val)
> +{
> +	const struct asus_wmi_sensor_info *sensor;
> +	u32 value = 0;
> +	int ret;
> +
> +	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
> +
> +	sensor = *(sensor_data->wmi.info[type] + channel);
> +
> +	ret = asus_wmi_get_cached_value_or_update(sensor, sensor_data, &value);
> +	if (!ret)
> +		*val = asus_wmi_scale_sensor_value(value, sensor->data_type);
> +
> +	return ret;
> +}
> +
> +static int asus_wmi_hwmon_read_string(struct device *dev,
> +				      enum hwmon_sensor_types type, u32 attr,
> +				      int channel, const char **str)
> +{
> +	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
> +	const struct asus_wmi_sensor_info *sensor;
> +
> +	sensor = *(sensor_data->wmi.info[type] + channel);
> +	*str = sensor->name;
> +
> +	return 0;
> +}
> +
> +static umode_t asus_wmi_hwmon_is_visible(const void *drvdata,
> +					 enum hwmon_sensor_types type, u32 attr,
> +					 int channel)
> +{
> +	const struct asus_wmi_sensors *sensor_data = drvdata;
> +	const struct asus_wmi_sensor_info *sensor;
> +
> +	sensor = *(sensor_data->wmi.info[type] + channel);
> +	if (sensor)
> +		return 0444;
> +
> +	return 0;
> +}
> +
> +static const struct hwmon_ops asus_wmi_hwmon_ops = {
> +	.is_visible = asus_wmi_hwmon_is_visible,
> +	.read = asus_wmi_hwmon_read,
> +	.read_string = asus_wmi_hwmon_read_string,
> +};
> +
> +static struct hwmon_chip_info asus_wmi_chip_info = {
> +	.ops = &asus_wmi_hwmon_ops,
> +	.info = NULL,
> +};
> +
> +static int asus_wmi_configure_sensor_setup(struct device *dev,
> +					   struct asus_wmi_sensors *sensor_data)
> +{
> +	const struct hwmon_channel_info **ptr_asus_wmi_ci;
> +	struct hwmon_channel_info *asus_wmi_hwmon_chan;
> +	int nr_count[hwmon_max] = {}, nr_types = 0;
> +	struct asus_wmi_sensor_info *temp_sensor;
> +	const struct hwmon_chip_info *chip_info;
> +	enum hwmon_sensor_types type;
> +	struct device *hwdev;
> +	int i, idx;
> +	int err;
> +
> +	sensor_data->wmi.buffer = -1;
> +	temp_sensor = devm_kcalloc(dev, 1, sizeof(*temp_sensor), GFP_KERNEL);
> +	if (!temp_sensor)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < sensor_data->wmi.sensor_count; i++) {
> +		err = asus_wmi_sensor_info(i, temp_sensor);
> +		if (err)
> +			return -EINVAL;
> +
Please have asus_wmi_sensor_info() always return a proper error code
and return that instead of replacing it.

> +		switch (temp_sensor->data_type) {
> +		case TEMPERATURE_C:
> +		case VOLTAGE:
> +		case CURRENT:
> +		case FAN_RPM:
> +		case WATER_FLOW:
> +			type = asus_data_types[temp_sensor->data_type];
> +			if (!nr_count[type])
> +				nr_types++;
> +			nr_count[type]++;
> +			break;
> +		}
> +	}
> +
> +	if (nr_count[hwmon_temp])
> +		nr_count[hwmon_chip]++, nr_types++;
> +
> +	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types,
> +					   sizeof(*asus_wmi_hwmon_chan),
> +					   GFP_KERNEL);
> +	if (!asus_wmi_hwmon_chan)
> +		return -ENOMEM;
> +
> +	ptr_asus_wmi_ci = devm_kcalloc(dev, nr_types + 1,
> +				       sizeof(*ptr_asus_wmi_ci), GFP_KERNEL);
> +	if (!ptr_asus_wmi_ci)
> +		return -ENOMEM;
> +
> +	asus_wmi_chip_info.info = ptr_asus_wmi_ci;
> +	chip_info = &asus_wmi_chip_info;
> +
> +	sensor_data->wmi.info_by_id = devm_kcalloc(dev, sensor_data->wmi.sensor_count,
> +						   sizeof(*sensor_data->wmi.info_by_id),
> +						   GFP_KERNEL);
> +
> +	if (!sensor_data->wmi.info_by_id)
> +		return -ENOMEM;
> +
> +	for (type = 0; type < hwmon_max; type++) {
> +		if (!nr_count[type])
> +			continue;
> +
> +		asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
> +					     nr_count[type], type,
> +					     hwmon_attributes[type]);
> +		*ptr_asus_wmi_ci++ = asus_wmi_hwmon_chan++;
> +
> +		sensor_data->wmi.info[type] = devm_kcalloc(dev,
> +							   nr_count[type],
> +							   sizeof(*sensor_data->wmi.info),
> +							   GFP_KERNEL);
> +		if (!sensor_data->wmi.info[type])
> +			return -ENOMEM;
> +	}
> +
> +	for (i = sensor_data->wmi.sensor_count - 1; i >= 0; i--) {
> +		temp_sensor = devm_kzalloc(dev, sizeof(*temp_sensor), GFP_KERNEL);
> +		if (!temp_sensor)
> +			return -ENOMEM;
> +
> +		err = asus_wmi_sensor_info(i, temp_sensor);
> +		if (err)
> +			continue;
> +
> +		switch (temp_sensor->data_type) {
> +		case TEMPERATURE_C:
> +		case VOLTAGE:
> +		case CURRENT:
> +		case FAN_RPM:
> +		case WATER_FLOW:
> +			type = asus_data_types[temp_sensor->data_type];
> +			idx = --nr_count[type];
> +			*(sensor_data->wmi.info[type] + idx) = temp_sensor;
> +			sensor_data->wmi.info_by_id[i] = temp_sensor;
> +			break;
> +		}
> +	}
> +
> +	dev_dbg(dev, "board has %d sensors",
> +		sensor_data->wmi.sensor_count);
> +
> +	hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_sensors",
> +						     sensor_data, chip_info, NULL);
> +
> +	return PTR_ERR_OR_ZERO(hwdev);
> +}
> +
> +static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
> +{
> +	struct asus_wmi_sensors *sensor_data;
> +	struct device *dev = &wdev->dev;
> +	u32 version = 0;
> +
> +	if (!dmi_check_system(asus_wmi_dmi_table))
> +		return -ENODEV;
> +
> +	sensor_data = devm_kzalloc(dev, sizeof(*sensor_data), GFP_KERNEL);
> +	if (!sensor_data)
> +		return -ENOMEM;
> +
> +	if (asus_wmi_get_version(&version))
> +		return -ENODEV;
> +
> +	if (asus_wmi_get_item_count(&sensor_data->wmi.sensor_count))
> +		return -ENODEV;
> +
> +	if (sensor_data->wmi.sensor_count  <= 0 || version < 2) {
> +		dev_info(dev, "version: %u with %d sensors is unsupported\n",
> +			 version, sensor_data->wmi.sensor_count);
> +
> +		return -ENODEV;
> +	}
> +
> +	mutex_init(&sensor_data->lock);
> +
> +	dev_set_drvdata(dev, sensor_data);
> +
> +	return asus_wmi_configure_sensor_setup(dev, sensor_data);
> +}
> +
> +static const struct wmi_device_id asus_wmi_id_table[] = {
> +	{ ASUSWMI_MONITORING_GUID, NULL },
> +	{ }
> +};
> +
> +static struct wmi_driver asus_sensors_wmi_driver = {
> +	.driver = {
> +		.name = "asus_wmi_sensors",
> +	},
> +	.id_table = asus_wmi_id_table,
> +	.probe = asus_wmi_probe,
> +};
> +module_wmi_driver(asus_sensors_wmi_driver);
> +
> +MODULE_AUTHOR("Ed Brindley <kernel@maidavale.org>");
> +MODULE_DESCRIPTION("Asus WMI Sensors Driver");
> +MODULE_LICENSE("GPL");
> 

Re: [PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Andy Shevchenko]

On Fri, Oct 22, 2021 at 11:00:29PM +0300, Denis Pauk wrote:
> Linux HWMON sensors driver for ASUS motherboards to read
> sensors from the embedded controller.
> 
> Many ASUS motherboards do not publish all the available
> sensors via the Super I/O chip but the missing ones are
> available through the embedded controller (EC) registers.
> 
> This driver implements reading those sensor data via the
> WMI method BREC, which is known to be present in all ASUS
> motherboards based on the AMD 500 series chipsets (and
> probably is available in other models too). The driver
> needs to know exact register addresses for the sensors and
> thus support for each motherboard has to be added explicitly.
> 
> The EC registers do not provide critical values for the
> sensors and as such they are not published to the HWMON.
> 
> Supported motherboards:
> * PRIME X570-PRO
> * Pro WS X570-ACE
> * ROG CROSSHAIR VIII HERO
> * ROG CROSSHAIR VIII DARK HERO
> * ROG CROSSHAIR VIII FORMULA
> * ROG STRIX X570-E GAMING
> * ROG STRIX B550-E GAMING

Below is a follow up, I have not compiled it.
Feel free to take fully or partially.

From 2128d5443cab11eed4710d30a5c477e3e95567cb Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 25 Oct 2021 19:13:38 +0300
Subject: [PATCH 1/1] hwmon: asus_wmi_ec_sensors: Multiple amendments

- Fix memory leaks in asus_wmi_ec_block_read()

- Fix buffer and parameter lengths in decode and encode algorithms

- Simplify encoding in read query

- Reshuffle structures to make pointer arithmetics simpler or
  no-op in some cases

- Shuffle parameters in some functions to make it more logical

- Use temporary variable for EC info data structure

- Many indentation fixes to improve readability (breaks 80 characters rule)

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/hwmon/asus_wmi_ec_sensors.c | 244 ++++++++++++++--------------
 1 file changed, 122 insertions(+), 122 deletions(-)

diff --git a/drivers/hwmon/asus_wmi_ec_sensors.c b/drivers/hwmon/asus_wmi_ec_sensors.c
index 87bd32487926..870de5a7f20d 100644
--- a/drivers/hwmon/asus_wmi_ec_sensors.c
+++ b/drivers/hwmon/asus_wmi_ec_sensors.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * HWMON driver for ASUS B550/X570 motherboards that publish sensor
  * values via the embedded controller registers.
@@ -7,17 +7,17 @@
  * Copyright (C) 2018-2019 Ed Brindley <kernel@maidavale.org>
  *
  * EC provides:
- * Chipset temperature,
- * CPU temperature,
- * Motherboard temperature,
- * T_Sensor temperature,
- * VRM  temperature,
- * Water In temperature,
- * Water Out temperature,
- * CPU Optional Fan RPM,
- * Chipset Fan RPM,
- * Water Flow Fan RPM,
- * CPU current.
+ * - Chipset temperature
+ * - CPU temperature
+ * - Motherboard temperature
+ * - T_Sensor temperature
+ * - VRM temperature
+ * - Water In temperature
+ * - Water Out temperature
+ * - CPU Optional Fan RPM
+ * - Chipset Fan RPM
+ * - Water Flow Fan RPM
+ * - CPU current
  */
 
 #include <linux/acpi.h>
@@ -30,23 +30,25 @@
 #include <linux/nls.h>
 #include <linux/units.h>
 #include <linux/wmi.h>
+
 #include <asm/unaligned.h>
+
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 
-#define ASUSWMI_MONITORING_GUID	"466747A0-70EC-11DE-8A39-0800200C9A66"
+#define ASUSWMI_MONITORING_GUID		"466747A0-70EC-11DE-8A39-0800200C9A66"
 #define ASUSWMI_METHODID_BLOCK_READ_EC	0x42524543 /* BREC */
 /* From the ASUS DSDT source */
-#define ASUSWMI_BREC_REGISTERS_MAX	0x10
-#define ASUSWMI_MAX_BUF_LEN	0x80
-#define SENSOR_LABEL_LEN	0x10
+#define ASUSWMI_BREC_REGISTERS_MAX	16
+#define ASUSWMI_MAX_BUF_LEN		128
+#define SENSOR_LABEL_LEN		16
 
 static u32 hwmon_attributes[] = {
-	[hwmon_chip] = HWMON_C_REGISTER_TZ,
-	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
-	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
-	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
-	[hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
+	[hwmon_chip]	= HWMON_C_REGISTER_TZ,
+	[hwmon_temp]	= HWMON_T_INPUT | HWMON_T_LABEL,
+	[hwmon_in]	= HWMON_I_INPUT | HWMON_I_LABEL,
+	[hwmon_curr]	= HWMON_C_INPUT | HWMON_C_LABEL,
+	[hwmon_fan]	= HWMON_F_INPUT | HWMON_F_LABEL,
 };
 
 struct asus_wmi_ec_sensor_address {
@@ -58,19 +60,19 @@ struct asus_wmi_ec_sensor_address {
 #define MAKE_SENSOR_ADDRESS(size_i, bank_i, index_i) {	\
 	.size = size_i,					\
 	.bank = bank_i,					\
-	.index = index_i				\
+	.index = index_i,				\
 }
 
 struct ec_sensor_info {
+	struct asus_wmi_ec_sensor_address addr;
 	char label[SENSOR_LABEL_LEN];
 	enum hwmon_sensor_types type;
-	struct asus_wmi_ec_sensor_address addr;
 };
 
 #define EC_SENSOR(sensor_label, sensor_type, size, bank, index) {	\
+	.addr = MAKE_SENSOR_ADDRESS(size, bank, index),			\
 	.label = sensor_label,						\
 	.type = sensor_type,						\
-	.addr = MAKE_SENSOR_ADDRESS(size, bank, index)			\
 }
 
 enum known_ec_sensor {
@@ -90,17 +92,17 @@ enum known_ec_sensor {
 
 /* All known sensors for ASUS EC controllers */
 static const struct ec_sensor_info known_ec_sensors[] = {
-	[SENSOR_TEMP_CHIPSET] = EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
-	[SENSOR_TEMP_CPU] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
-	[SENSOR_TEMP_MB] = EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
-	[SENSOR_TEMP_T_SENSOR] = EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
-	[SENSOR_TEMP_VRM] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
-	[SENSOR_FAN_CPU_OPT] = EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
-	[SENSOR_FAN_CHIPSET] = EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4),
-	[SENSOR_FAN_WATER_FLOW] = EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
-	[SENSOR_CURR_CPU] = EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
-	[SENSOR_TEMP_WATER_IN] = EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
-	[SENSOR_TEMP_WATER_OUT] = EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
+	[SENSOR_TEMP_CHIPSET]	= EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
+	[SENSOR_TEMP_CPU]	= EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
+	[SENSOR_TEMP_MB]	= EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
+	[SENSOR_TEMP_T_SENSOR]	= EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
+	[SENSOR_TEMP_VRM]	= EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
+	[SENSOR_FAN_CPU_OPT]	= EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
+	[SENSOR_FAN_CHIPSET]	= EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4),
+	[SENSOR_FAN_WATER_FLOW]	= EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
+	[SENSOR_CURR_CPU]	= EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
+	[SENSOR_TEMP_WATER_IN]	= EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
+	[SENSOR_TEMP_WATER_OUT]	= EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
 };
 
 struct asus_wmi_data {
@@ -178,13 +180,12 @@ static struct asus_wmi_data sensors_board_RS_X570_E_G = {
 	},
 };
 
-#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name, sensors) {	\
-	.matches = {						\
-		DMI_EXACT_MATCH(DMI_BOARD_VENDOR,		\
-				"ASUSTeK COMPUTER INC."),	\
-		DMI_EXACT_MATCH(DMI_BOARD_NAME, name),		\
-	},							\
-	.driver_data = sensors,					\
+#define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name, sensors) {			\
+	.matches = {								\
+		DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC."),	\
+		DMI_EXACT_MATCH(DMI_BOARD_NAME, name),				\
+	},									\
+	.driver_data = sensors,							\
 }
 
 static const struct dmi_system_id asus_wmi_ec_dmi_table[] = {
@@ -207,11 +208,10 @@ struct ec_sensor {
 /**
  * struct asus_wmi_ec_info - sensor info.
  * @sensors: list of sensors.
- * @read_arg: UTF-16 string to pass to BRxx() WMI function.
+ * @read_arg: UTF-16LE string to pass to BRxx() WMI function.
  * @read_buffer: decoded output from WMI result.
  * @nr_sensors: number of board EC sensors.
- * @nr_registers: number of EC registers to read (sensor might span more than
- *                         1 register).
+ * @nr_registers: number of EC registers to read (sensor might span more than 1 register).
  * @last_updated: in jiffies.
  */
 struct asus_wmi_ec_info {
@@ -224,9 +224,9 @@ struct asus_wmi_ec_info {
 };
 
 struct asus_wmi_sensors {
+	struct asus_wmi_ec_info ec;
 	/* lock access to internal cache */
 	struct mutex lock;
-	struct asus_wmi_ec_info ec;
 };
 
 static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
@@ -238,7 +238,7 @@ static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
 	ec->nr_sensors = 0;
 	ec->nr_registers = 0;
 
-	for (i = 0; i < SENSOR_MAX && bsi[i] != SENSOR_MAX; i++) {
+	for (i = 0; bsi[i] != SENSOR_MAX; i++) {
 		s[i].info_index = bsi[i];
 		ec->nr_sensors++;
 		ec->nr_registers += known_ec_sensors[bsi[i]].addr.size;
@@ -248,62 +248,54 @@ static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
 }
 
 /*
- * The next four functions converts to/from BRxx string argument format.
+ * The next four functions convert to or from BRxx string argument format.
  * The format of the string is as follows:
- * * The string consists of two-byte UTF-16 characters.
- * * The value of the very first byte int the string is equal to the total
+ * - The string consists of two-byte UTF-16LE characters.
+ * - The value of the very first byte in the string is equal to the total
  *   length of the next string in bytes, thus excluding the first two-byte
  *   character.
- * * The rest of the string encodes pairs of (bank, index) pairs, where both
- *   values are byte-long (0x00 to 0xFF).
- * * Numbers are encoded as UTF-16 hex values.
+ * - The rest of the string encodes the pairs of (bank, index) pairs, where
+ *   both values are byte-long (0x00 to 0xFF).
+ * - Numbers are encoded as UTF-16LE hex values.
  */
-static int asus_wmi_ec_decode_reply_buffer(const u8 *inp, u8 *out, u32 length)
+static int asus_wmi_ec_decode_reply_buffer(const u8 *in, u32 length, u8 *out)
 {
 	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
-	const char *pos = buffer;
-	const u8 *data = inp + 2;
 	u32 len;
 
-	/* Minimum of size of response and size of ACPI result*/
-	len = min_t(u32, inp[0] / 4, (length - 2) / 4);
-	len = min_t(u32, len, ASUSWMI_MAX_BUF_LEN);
+	/* Minimum of size of response and size of ACPI result (in bytes) */
+	len = min_t(u32, in[0], length - 2);
 
-	utf16s_to_utf8s((wchar_t *)data, len * 2,  UTF16_LITTLE_ENDIAN, buffer, len * 2);
+	utf16s_to_utf8s((wchar_t *)(in + 2), len / 2, UTF16_LITTLE_ENDIAN, buffer, sizeof(buffer));
 
-	return hex2bin(out, pos, len);
+	return hex2bin(out, buffer, len / 2);
 }
 
-static void asus_wmi_ec_encode_registers(const u16 *registers, u8 len, char *out)
+static void asus_wmi_ec_encode_registers(const u8 *in, u32 length, char *out)
 {
 	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
-	char *pos = buffer;
-	unsigned int i;
-	u8 byte;
-
-	*out++ = len * 8;
-	*out++ = 0;
-
-	for (i = 0; i < len; i++) {
-		byte = registers[i] >> 8;
-		pos = bin2hex(pos, &byte, 1);
-		byte = registers[i];
-		pos = bin2hex(pos, &byte, 1);
-	}
+	u16 len = nr_registers * 2;
+
+	put_unaligned_le16(len * 2, out);
+
+	bin2hex(buffer, in, len);
 
-	utf8s_to_utf16s(buffer, len * 4, UTF16_LITTLE_ENDIAN, (wchar_t *)out, len * 4);
+	utf8s_to_utf16s(buffer, len * 2, UTF16_LITTLE_ENDIAN, (wchar_t *)(out + 2), len);
 }
 
 static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
 {
-	u16 registers[ASUSWMI_BREC_REGISTERS_MAX];
+	u8 registers[ASUSWMI_BREC_REGISTERS_MAX * 2];
 	const struct ec_sensor_info *si;
-	int i, j, register_idx = 0;
+	int i, j, offset;
 
+	offset = 0;
 	for (i = 0; i < ec->nr_sensors; i++) {
 		si = &known_ec_sensors[ec->sensors[i].info_index];
-		for (j = 0; j < si->addr.size; j++, register_idx++)
-			registers[register_idx] = (si->addr.bank << 8) + si->addr.index + j;
+		for (j = 0; j < si->addr.size; j++) {
+			registers[offset++] = si->addr.bank;
+			registers[offset++] = si->addr.index + j;
+		}
 	}
 
 	asus_wmi_ec_encode_registers(registers, ec->nr_registers, ec->read_arg);
@@ -315,20 +307,28 @@ static int asus_wmi_ec_block_read(u32 method_id, char *query, u8 *out)
 	struct acpi_buffer input;
 	union acpi_object *obj;
 	acpi_status status;
+	int ret;
 
 	/* The first byte of the BRxx() argument string has to be the string size. */
 	input.length = query[0] + 2;
 	input.pointer = query;
-	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
-				     method_id, &input, &output);
+	status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0, method_id, &input, &output);
 	if (ACPI_FAILURE(status))
 		return -EIO;
 
 	obj = output.pointer;
-	if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 2)
+	if (!obj)
 		return -EIO;
 
-	return asus_wmi_ec_decode_reply_buffer(obj->buffer.pointer, out, obj->buffer.length);
+	ret = -EIO;
+	if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 2)
+		goto out_free_obj;
+
+	ret = asus_wmi_ec_decode_reply_buffer(obj->buffer.pointer, obj->buffer.length, out);
+
+out_free_obj:
+	ACPI_FREE(obj);
+	return ret;
 }
 
 static inline u32 get_sensor_value(const struct ec_sensor_info *si, u8 *data)
@@ -348,8 +348,8 @@ static inline u32 get_sensor_value(const struct ec_sensor_info *si, u8 *data)
 static void asus_wmi_ec_update_ec_sensors(struct asus_wmi_ec_info *ec)
 {
 	const struct ec_sensor_info *si;
-	u8 i_sensor;
 	struct ec_sensor *s;
+	u8 i_sensor;
 	u8 *data;
 
 	data = ec->read_buffer;
@@ -389,30 +389,30 @@ static int asus_wmi_ec_find_sensor_index(const struct asus_wmi_ec_info *ec,
 	return -EINVAL;
 }
 
-static int asus_wmi_ec_get_cached_value_or_update(int sensor_index,
-						  struct asus_wmi_sensors *state,
+static int asus_wmi_ec_get_cached_value_or_update(struct asus_wmi_sensors *sensor_data,
+						  int sensor_index,
 						  u32 *value)
 {
+	struct asus_wmi_ec_info *ec = &sensor_data->ec;
 	int ret;
 
-	mutex_lock(&state->lock);
+	mutex_lock(&sensor_data->lock);
 
-	if (time_after(jiffies, state->ec.last_updated + HZ)) {
+	if (time_after(jiffies, ec->last_updated + HZ)) {
 		ret = asus_wmi_ec_block_read(ASUSWMI_METHODID_BLOCK_READ_EC,
-					     state->ec.read_arg,
-					     state->ec.read_buffer);
+					     ec->read_arg, ec->read_buffer);
 		if (ret) {
-			mutex_unlock(&state->lock);
+			mutex_unlock(&sensors_data->lock);
 			return ret;
 		}
 
-		asus_wmi_ec_update_ec_sensors(&state->ec);
-		state->ec.last_updated = jiffies;
+		asus_wmi_ec_update_ec_sensors(ec);
+		ec->last_updated = jiffies;
 	}
 
-	*value = state->ec.sensors[sensor_index].cached_value;
+	*value = ec->sensors[sensor_index].cached_value;
 
-	mutex_unlock(&state->lock);
+	mutex_unlock(&sensor_data->lock);
 
 	return 0;
 }
@@ -423,20 +423,20 @@ static int asus_wmi_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types ty
 				  u32 attr, int channel, long *val)
 {
 	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+	struct asus_wmi_ec_info *ec = &sensor_data->ec;
 	int ret, sidx, info_index;
 	u32 value = 0;
 
-	sidx = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+	sidx = asus_wmi_ec_find_sensor_index(ec, type, channel);
 	if (sidx < 0)
 		return sidx;
 
-	ret = asus_wmi_ec_get_cached_value_or_update(sidx, sensor_data, &value);
+	ret = asus_wmi_ec_get_cached_value_or_update(sensor_data, sidx, &value);
 	if (ret)
 		return ret;
 
-	info_index = sensor_data->ec.sensors[sidx].info_index;
-	*val = asus_wmi_ec_scale_sensor_value(value,
-					      known_ec_sensors[info_index].type);
+	info_index = ec->sensors[sidx].info_index;
+	*val = asus_wmi_ec_scale_sensor_value(value, known_ec_sensors[info_index].type);
 
 	return ret;
 }
@@ -446,10 +446,11 @@ static int asus_wmi_ec_hwmon_read_string(struct device *dev,
 					 int channel, const char **str)
 {
 	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+	struct asus_wmi_ec_info *ec = &sensor_data->ec;
 	int sensor_index;
 
-	sensor_index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
-	*str = known_ec_sensors[sensor_data->ec.sensors[sensor_index].info_index].label;
+	sensor_index = asus_wmi_ec_find_sensor_index(ec, type, channel);
+	*str = known_ec_sensors[ec->sensors[sensor_index].info_index].label;
 
 	return 0;
 }
@@ -459,9 +460,10 @@ static umode_t asus_wmi_ec_hwmon_is_visible(const void *drvdata,
 					    int channel)
 {
 	const struct asus_wmi_sensors *sensor_data = drvdata;
+	struct asus_wmi_ec_info *ec = &sensor_data->ec;
 	int index;
 
-	index = asus_wmi_ec_find_sensor_index(&sensor_data->ec, type, channel);
+	index = asus_wmi_ec_find_sensor_index(ec, type, channel);
 
 	return index < 0 ? 0 : 0444;
 }
@@ -494,11 +496,12 @@ static struct hwmon_chip_info asus_wmi_ec_chip_info = {
 };
 
 static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
-					      struct asus_wmi_sensors *sensor_data,
 					      const enum known_ec_sensor *bsi)
 {
+	struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
+	struct asus_wmi_ec_info *ec = &sensor_data->ec;
 	struct hwmon_channel_info *asus_wmi_hwmon_chan;
-	const struct hwmon_channel_info **ptr_asus_wmi_ci;
+	const struct hwmon_channel_info **asus_wmi_ci;
 	int nr_count[hwmon_max] = {}, nr_types = 0;
 	const struct hwmon_chip_info *chip_info;
 	const struct ec_sensor_info *si;
@@ -506,15 +509,15 @@ static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
 	struct device *hwdev;
 	int i, ret;
 
-	ret = asus_wmi_ec_fill_board_sensors(&sensor_data->ec, bsi);
+	ret = asus_wmi_ec_fill_board_sensors(ec, bsi);
 	if (ret)
 		return ret;
 
 	if (!sensor_data->ec.nr_sensors)
 		return -ENODEV;
 
-	for (i = 0; i < sensor_data->ec.nr_sensors; i++) {
-		si = &known_ec_sensors[sensor_data->ec.sensors[i].info_index];
+	for (i = 0; i < ec->nr_sensors; i++) {
+		si = &known_ec_sensors[ec->sensors[i].info_index];
 		if (!nr_count[si->type])
 			nr_types++;
 		nr_count[si->type]++;
@@ -529,20 +532,18 @@ static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
 	 * If we can get values for all the registers in a single query,
 	 * the query will not change from call to call.
 	 */
-	asus_wmi_ec_make_block_read_query(&sensor_data->ec);
+	asus_wmi_ec_make_block_read_query(ec);
 
-	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types,
-					   sizeof(*asus_wmi_hwmon_chan),
+	asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*asus_wmi_hwmon_chan),
 					   GFP_KERNEL);
 	if (!asus_wmi_hwmon_chan)
 		return -ENOMEM;
 
-	ptr_asus_wmi_ci = devm_kcalloc(dev, nr_types + 1,
-				       sizeof(*ptr_asus_wmi_ci), GFP_KERNEL);
-	if (!ptr_asus_wmi_ci)
+	asus_wmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*asus_wmi_ci), GFP_KERNEL);
+	if (!asus_wmi_ci)
 		return -ENOMEM;
 
-	asus_wmi_ec_chip_info.info = ptr_asus_wmi_ci;
+	asus_wmi_ec_chip_info.info = asus_wmi_ci;
 	chip_info = &asus_wmi_ec_chip_info;
 
 	for (type = 0; type < hwmon_max; type++) {
@@ -555,12 +556,11 @@ static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
 		if (ret)
 			return ret;
 
-		*ptr_asus_wmi_ci++ = asus_wmi_hwmon_chan++;
+		*asus_wmi_ci++ = asus_wmi_hwmon_chan++;
 	}
 
 	dev_dbg(dev, "board has %d EC sensors that span %d registers",
-		sensor_data->ec.nr_sensors,
-		sensor_data->ec.nr_registers);
+		ec->nr_sensors, ec->nr_registers);
 
 	hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_ec_sensors",
 						     sensor_data, chip_info, NULL);
@@ -572,8 +572,8 @@ static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
 {
 	struct asus_wmi_sensors *sensor_data;
 	struct asus_wmi_data *board_sensors;
-	const enum known_ec_sensor *bsi;
 	const struct dmi_system_id *dmi_id;
+	const enum known_ec_sensor *bsi;
 	struct device *dev = &wdev->dev;
 
 	dmi_id = dmi_first_match(asus_wmi_ec_dmi_table);
@@ -591,11 +591,11 @@ static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
 		return -ENOMEM;
 
 	mutex_init(&sensor_data->lock);
+	sensor_data->dev = dev;
 
 	dev_set_drvdata(dev, sensor_data);
 
-	return asus_wmi_ec_configure_sensor_setup(dev,
-						  sensor_data, bsi);
+	return asus_wmi_ec_configure_sensor_setup(dev, bsi);
 }
 
 static const struct wmi_device_id asus_ec_wmi_id_table[] = {
-- 
2.33.0



-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Andy Shevchenko]

On Mon, Oct 25, 2021 at 10:20:17PM +0300, Andy Shevchenko wrote:
> On Fri, Oct 22, 2021 at 11:00:29PM +0300, Denis Pauk wrote:
> > Linux HWMON sensors driver for ASUS motherboards to read
> > sensors from the embedded controller.
> > 
> > Many ASUS motherboards do not publish all the available
> > sensors via the Super I/O chip but the missing ones are
> > available through the embedded controller (EC) registers.
> > 
> > This driver implements reading those sensor data via the
> > WMI method BREC, which is known to be present in all ASUS
> > motherboards based on the AMD 500 series chipsets (and
> > probably is available in other models too). The driver
> > needs to know exact register addresses for the sensors and
> > thus support for each motherboard has to be added explicitly.
> > 
> > The EC registers do not provide critical values for the
> > sensors and as such they are not published to the HWMON.
> > 
> > Supported motherboards:
> > * PRIME X570-PRO
> > * Pro WS X570-ACE
> > * ROG CROSSHAIR VIII HERO
> > * ROG CROSSHAIR VIII DARK HERO
> > * ROG CROSSHAIR VIII FORMULA
> > * ROG STRIX X570-E GAMING
> > * ROG STRIX B550-E GAMING
> 
> Below is a follow up, I have not compiled it.
> Feel free to take fully or partially.

...

> -static int asus_wmi_ec_decode_reply_buffer(const u8 *inp, u8 *out, u32 length)
> +static int asus_wmi_ec_decode_reply_buffer(const u8 *in, u32 length, u8 *out)
>  {
>  	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
> -	const char *pos = buffer;
> -	const u8 *data = inp + 2;
>  	u32 len;
>  
> -	/* Minimum of size of response and size of ACPI result*/
> -	len = min_t(u32, inp[0] / 4, (length - 2) / 4);
> -	len = min_t(u32, len, ASUSWMI_MAX_BUF_LEN);
> +	/* Minimum of size of response and size of ACPI result (in bytes) */
> +	len = min_t(u32, in[0], length - 2);

Of course this should be

        len = min_t(u32, get_unaligned_le16(in), length - 2);

(compare to the opposite below).

> -	utf16s_to_utf8s((wchar_t *)data, len * 2,  UTF16_LITTLE_ENDIAN, buffer, len * 2);
> +	utf16s_to_utf8s((wchar_t *)(in + 2), len / 2, UTF16_LITTLE_ENDIAN, buffer, sizeof(buffer));
>  
> -	return hex2bin(out, pos, len);
> +	return hex2bin(out, buffer, len / 2);
>  }
>  
> -static void asus_wmi_ec_encode_registers(const u16 *registers, u8 len, char *out)
> +static void asus_wmi_ec_encode_registers(const u8 *in, u32 length, char *out)
>  {
>  	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
> -	char *pos = buffer;
> -	unsigned int i;
> -	u8 byte;
> -
> -	*out++ = len * 8;
> -	*out++ = 0;
> -
> -	for (i = 0; i < len; i++) {
> -		byte = registers[i] >> 8;
> -		pos = bin2hex(pos, &byte, 1);
> -		byte = registers[i];
> -		pos = bin2hex(pos, &byte, 1);
> -	}
> +	u16 len = nr_registers * 2;
> +
> +	put_unaligned_le16(len * 2, out);
> +
> +	bin2hex(buffer, in, len);
>  
> -	utf8s_to_utf16s(buffer, len * 4, UTF16_LITTLE_ENDIAN, (wchar_t *)out, len * 4);
> +	utf8s_to_utf16s(buffer, len * 2, UTF16_LITTLE_ENDIAN, (wchar_t *)(out + 2), len);
>  }

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Andy Shevchenko]

On Mon, Oct 25, 2021 at 10:37:06PM +0300, Andy Shevchenko wrote:
> On Mon, Oct 25, 2021 at 10:20:17PM +0300, Andy Shevchenko wrote:
> > On Fri, Oct 22, 2021 at 11:00:29PM +0300, Denis Pauk wrote:

...

> > Below is a follow up, I have not compiled it.
> > Feel free to take fully or partially.

Okay, here a few additional fixes (make them symmetrical and hope that
it will compile now):

diff --git a/drivers/hwmon/asus_wmi_ec_sensors.c b/drivers/hwmon/asus_wmi_ec_sensors.c
index 870de5a7f20d..d39271b5e50c 100644
--- a/drivers/hwmon/asus_wmi_ec_sensors.c
+++ b/drivers/hwmon/asus_wmi_ec_sensors.c
@@ -261,10 +261,7 @@ static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
 static int asus_wmi_ec_decode_reply_buffer(const u8 *in, u32 length, u8 *out)
 {
 	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
-	u32 len;
-
-	/* Minimum of size of response and size of ACPI result (in bytes) */
-	len = min_t(u32, in[0], length - 2);
+	u32 len = min_t(u32, get_unaligned_le16(in), length - 2);
 
 	utf16s_to_utf8s((wchar_t *)(in + 2), len / 2, UTF16_LITTLE_ENDIAN, buffer, sizeof(buffer));
 
@@ -274,13 +271,13 @@ static int asus_wmi_ec_decode_reply_buffer(const u8 *in, u32 length, u8 *out)
 static void asus_wmi_ec_encode_registers(const u8 *in, u32 length, char *out)
 {
 	char buffer[ASUSWMI_MAX_BUF_LEN * 2];
-	u16 len = nr_registers * 2;
-
-	put_unaligned_le16(len * 2, out);
+	u32 len = length;
 
 	bin2hex(buffer, in, len);
 
 	utf8s_to_utf16s(buffer, len * 2, UTF16_LITTLE_ENDIAN, (wchar_t *)(out + 2), len);
+
+	put_unaligned_le16(len * 2, out);
 }
 
 static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
@@ -298,7 +295,7 @@ static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
 		}
 	}
 
-	asus_wmi_ec_encode_registers(registers, ec->nr_registers, ec->read_arg);
+	asus_wmi_ec_encode_registers(registers, offset, ec->read_arg);
 }
 
 static int asus_wmi_ec_block_read(u32 method_id, char *query, u8 *out)

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Denis Pauk]

Hi Andy,

Thank you, currently code has returned N/A by some reason. I will search
place of regression.

On Mon, 25 Oct 2021 22:49:02 +0300
Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
...
> 
> Okay, here a few additional fixes (make them symmetrical and hope that
> it will compile now):
> 
...

Best regards,
    Denis.

Re: [PATCH v8 1/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

[Andy Shevchenko]

On Tue, Oct 26, 2021 at 10:58 PM Denis Pauk <pauk.denis@gmail.com> wrote:

> Thank you, currently code has returned N/A by some reason. I will search
> place of regression.

The code I issued is a complete draft and basically it's just an idea
on how to improve in the form of a patch.
I'm pretty sure there may be some bugs lurking.

-- 
With Best Regards,
Andy Shevchenko