Re: [PATCH v2] hwmon: (aquacomputer_d5next) Add support for Aquacomputer Octo

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On 3/26/22 03:12, Aleksa Savic wrote:
Extend aquacomputer_d5next driver to expose hardware temperature sensors
and fans of the Aquacomputer Octo fan controller, which communicates
through a proprietary USB HID protocol.

Four temperature sensors and eight PWM controllable fans are available.
Additionally, serial number, firmware version and power-on count are
exposed through debugfs.

This driver has been tested on x86_64.

Signed-off-by: Aleksa Savic <savicaleksa83@xxxxxxxxx>
---
Changes in v2:
- Fixed formatting
- HID report values from device are now being converted sooner
- aqc_pwm_to_percent() is now range checked
- Put pointers to labels in aqc_data
- Simplified checksum calculation call
---
  Documentation/hwmon/aquacomputer_d5next.rst |   4 +
  drivers/hwmon/Kconfig                       |   7 +-
  drivers/hwmon/aquacomputer_d5next.c         | 446 +++++++++++++++++---
  3 files changed, 404 insertions(+), 53 deletions(-)

diff --git a/Documentation/hwmon/aquacomputer_d5next.rst b/Documentation/hwmon/aquacomputer_d5next.rst
index 3373e27b707d..e69f718caf5b 100644
--- a/Documentation/hwmon/aquacomputer_d5next.rst
+++ b/Documentation/hwmon/aquacomputer_d5next.rst
@@ -7,6 +7,7 @@ Supported devices:
* Aquacomputer D5 Next watercooling pump
  * Aquacomputer Farbwerk 360 RGB controller
+* Aquacomputer Octo fan controller
Author: Aleksa Savic @@ -28,6 +29,9 @@ seems to require sending it a complete configuration. That includes addressable
  RGB LEDs, for which there is no standard sysfs interface. Thus, that task is
  better suited for userspace tools.
+The Octo exposes four temperature sensors and eight PWM controllable fans, along
+with their speed (in RPM), power, voltage and current.
+
  The Farbwerk 360 exposes four temperature sensors. Depending on the device,
  not all sysfs and debugfs entries will be available.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index db8bc55e5f50..5beadd8a0932 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -256,11 +256,12 @@ config SENSORS_AHT10
  	  will be called aht10.
config SENSORS_AQUACOMPUTER_D5NEXT
-	tristate "Aquacomputer D5 Next watercooling pump"
+	tristate "Aquacomputer D5 Next, Octo and Farbwerk 360"
  	depends on USB_HID
  	help
-	  If you say yes here you get support for the Aquacomputer D5 Next
-	  watercooling pump sensors.
+	  If you say yes here you get support for sensors and fans of
+	  the Aquacomputer D5 Next watercooling pump, Octo fan
+	  controller and Farbwerk 360 RGB controller, where available.
This driver can also be built as a module. If so, the module
  	  will be called aquacomputer_d5next.
diff --git a/drivers/hwmon/aquacomputer_d5next.c b/drivers/hwmon/aquacomputer_d5next.c
index 525809cf7c95..1711957a9ea7 100644
--- a/drivers/hwmon/aquacomputer_d5next.c
+++ b/drivers/hwmon/aquacomputer_d5next.c
@@ -1,6 +1,6 @@
  // SPDX-License-Identifier: GPL-2.0+
  /*
- * hwmon driver for Aquacomputer devices (D5 Next, Farbwerk 360)
+ * hwmon driver for Aquacomputer devices (D5 Next, Farbwerk 360, Octo)
   *
   * Aquacomputer devices send HID reports (with ID 0x01) every second to report
   * sensor values.
@@ -8,23 +8,27 @@
   * Copyright 2021 Aleksa Savic <savicaleksa83@xxxxxxxxx>
   */
+#include <linux/crc16.h>
  #include <linux/debugfs.h>
  #include <linux/hid.h>
  #include <linux/hwmon.h>
  #include <linux/jiffies.h>
  #include <linux/module.h>
+#include <linux/mutex.h>
  #include <linux/seq_file.h>
  #include <asm/unaligned.h>
#define USB_VENDOR_ID_AQUACOMPUTER 0x0c70
  #define USB_PRODUCT_ID_D5NEXT		0xf00e
  #define USB_PRODUCT_ID_FARBWERK360	0xf010
+#define USB_PRODUCT_ID_OCTO		0xf011
-enum kinds { d5next, farbwerk360 };
+enum kinds { d5next, farbwerk360, octo };
static const char *const aqc_device_names[] = {
  	[d5next] = "d5next",
-	[farbwerk360] = "farbwerk360"
+	[farbwerk360] = "farbwerk360",
+	[octo] = "octo"
  };
#define DRIVER_NAME "aquacomputer_d5next"
@@ -35,6 +39,18 @@ static const char *const aqc_device_names[] = {
  #define SERIAL_SECOND_PART		5
  #define FIRMWARE_VERSION		13
+#define CTRL_REPORT_ID 0x03
+
+/* The HID report that the official software always sends
+ * after writing values, currently same for all devices
+ */
+#define SECONDARY_CTRL_REPORT_ID	0x02
+#define SECONDARY_CTRL_REPORT_SIZE	0x0B
+
+static u8 secondary_ctrl_report[] = {
+	0x02, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x34, 0xC6
+};
+
  /* Register offsets for the D5 Next pump */
  #define D5NEXT_POWER_CYCLES		24
@@ -55,12 +71,38 @@ static const char *const aqc_device_names[] = { /* Register offsets for the Farbwerk 360 RGB controller */
  #define FARBWERK360_NUM_SENSORS		4
-#define FARBWERK360_SENSOR_START		0x32
+#define FARBWERK360_SENSOR_START	0x32
  #define FARBWERK360_SENSOR_SIZE		0x02
  #define FARBWERK360_SENSOR_DISCONNECTED	0x7FFF
+/* Register offsets for the Octo fan controller */
+#define OCTO_POWER_CYCLES		0x18
+#define OCTO_NUM_FANS			8
+#define OCTO_FAN_PERCENT_OFFSET		0x00
+#define OCTO_FAN_VOLTAGE_OFFSET		0x02
+#define OCTO_FAN_CURRENT_OFFSET		0x04
+#define OCTO_FAN_POWER_OFFSET		0x06
+#define OCTO_FAN_SPEED_OFFSET		0x08
+
+static u8 octo_sensor_fan_offsets[] = { 0x7D, 0x8A, 0x97, 0xA4, 0xB1, 0xBE, 0xCB, 0xD8 };
+
+#define OCTO_NUM_SENSORS		4
+#define OCTO_SENSOR_START		0x3D
+#define OCTO_SENSOR_SIZE		0x02
+#define OCTO_SENSOR_DISCONNECTED	0x7FFF
+
+#define OCTO_CTRL_REPORT_SIZE			0x65F
+#define OCTO_CTRL_REPORT_CHECKSUM_OFFSET	0x65D
+#define OCTO_CTRL_REPORT_CHECKSUM_START		0x01
+#define OCTO_CTRL_REPORT_CHECKSUM_LENGTH	0x65C
+
+/* Fan speed registers in Octo control report (from 0-100%) */
+static u16 octo_ctrl_fan_offsets[] = { 0x5B, 0xB0, 0x105, 0x15A, 0x1AF, 0x204, 0x259, 0x2AE };
+
  /* Labels for D5 Next */
-#define L_D5NEXT_COOLANT_TEMP		"Coolant temp"
+static const char *const label_d5next_temp[] = {
+	"Coolant temp"
+};
static const char *const label_d5next_speeds[] = {
  	"Pump speed",
@@ -83,7 +125,7 @@ static const char *const label_d5next_current[] = {
  	"Fan current"
  };
-/* Labels for Farbwerk 360 temperature sensors */
+/* Labels for Farbwerk 360 and Octo temperature sensors */
  static const char *const label_temp_sensors[] = {
  	"Sensor 1",
  	"Sensor 2",
@@ -91,32 +133,196 @@ static const char *const label_temp_sensors[] = {
  	"Sensor 4"
  };
+/* Labels for Octo */
+static const char *const label_fan_speed[] = {
+	"Fan 1 speed",
+	"Fan 2 speed",
+	"Fan 3 speed",
+	"Fan 4 speed",
+	"Fan 5 speed",
+	"Fan 6 speed",
+	"Fan 7 speed",
+	"Fan 8 speed"
+};
+
+static const char *const label_fan_power[] = {
+	"Fan 1 power",
+	"Fan 2 power",
+	"Fan 3 power",
+	"Fan 4 power",
+	"Fan 5 power",
+	"Fan 6 power",
+	"Fan 7 power",
+	"Fan 8 power"
+};
+
+static const char *const label_fan_voltage[] = {
+	"Fan 1 voltage",
+	"Fan 2 voltage",
+	"Fan 3 voltage",
+	"Fan 4 voltage",
+	"Fan 5 voltage",
+	"Fan 6 voltage",
+	"Fan 7 voltage",
+	"Fan 8 voltage"
+};
+
+static const char *const label_fan_current[] = {
+	"Fan 1 current",
+	"Fan 2 current",
+	"Fan 3 current",
+	"Fan 4 current",
+	"Fan 5 current",
+	"Fan 6 current",
+	"Fan 7 current",
+	"Fan 8 current"
+};
+
  struct aqc_data {
  	struct hid_device *hdev;
  	struct device *hwmon_dev;
  	struct dentry *debugfs;
+	struct mutex mutex;	/* Used for locking access when reading and writing PWM values */
  	enum kinds kind;
  	const char *name;
+ int buffer_size;
+	u8 *buffer;
+	int checksum_start;
+	int checksum_length;
+	int checksum_offset;
+
  	/* General info, same across all devices */
  	u32 serial_number[2];
  	u16 firmware_version;
- /* D5 Next specific - how many times the device was powered on */
+	/* How many times the device was powered on */
  	u32 power_cycles;
/* Sensor values */
  	s32 temp_input[4];
-	u16 speed_input[2];
-	u32 power_input[2];
-	u16 voltage_input[3];
-	u16 current_input[2];
+	u16 speed_input[8];
+	u32 power_input[8];
+	u16 voltage_input[8];
+	u16 current_input[8];
+
+	/* Label values */
+	const char *const *temp_label;
+	const char *const *speed_label;
+	const char *const *power_label;
+	const char *const *voltage_label;
+	const char *const *current_label;
unsigned long updated;
  };
-static umode_t aqc_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
-			      int channel)
+static int aqc_percent_to_pwm(u16 val)
+{
+	return DIV_ROUND_CLOSEST(val * 255, 100 * 100);
+}
+
+static int aqc_pwm_to_percent(long val)
+{
+	if (val < 0 || val > 255)
+		return -EINVAL;
+
+	return DIV_ROUND_CLOSEST(val * 100 * 100, 255);

This is really centi-percent, or am I missing something ?

+}
+
+/* Expects the mutex to be locked */
+static int aqc_get_ctrl_data(struct aqc_data *priv)
+{
+	int ret;
+
+	memset(priv->buffer, 0x00, priv->buffer_size);
+	ret = hid_hw_raw_request(priv->hdev, CTRL_REPORT_ID, priv->buffer, priv->buffer_size,
+				 HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+	if (ret < 0)
+		ret = -ENODATA;
+
+	return ret;
+}
+
+/* Expects the mutex to be locked */
+static int aqc_send_ctrl_data(struct aqc_data *priv)
+{
+	int ret;
+	u16 checksum;
+
+	/* Init and xorout value for CRC-16/USB is 0xffff */
+	checksum = crc16(0xffff, priv->buffer + priv->checksum_start, priv->checksum_length);
+	checksum ^= 0xffff;
+
+	/* Place the new checksum at the end of the report */
+	put_unaligned_be16(checksum, priv->buffer + priv->checksum_offset);
+
+	/* Send the patched up report back to the device */
+	ret = hid_hw_raw_request(priv->hdev, CTRL_REPORT_ID, priv->buffer, priv->buffer_size,
+				 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+	if (ret < 0)
+		goto exit;

Please return directly.

+
+	/* The official software sends this report after every change, so do it here as well */
+	ret = hid_hw_raw_request(priv->hdev, SECONDARY_CTRL_REPORT_ID, secondary_ctrl_report,
+				 SECONDARY_CTRL_REPORT_SIZE, HID_FEATURE_REPORT,
+				 HID_REQ_SET_REPORT);
+exit:
+	return ret;
+}
+
+/* Refreshes the control buffer and returns value at offset */
+static int aqc_get_ctrl_val(struct aqc_data *priv, int offset)
+{
+	int ret;
+
+	mutex_lock(&priv->mutex);
+
+	ret = aqc_get_ctrl_data(priv);
+	if (ret < 0)
+		goto unlock_and_return;
+
+	ret = get_unaligned_be16(priv->buffer + offset);
+
+unlock_and_return:
+	mutex_unlock(&priv->mutex);
+	return ret;
+}
+
+static int aqc_set_ctrl_val(struct aqc_data *priv, int offset, long val, size_t size)
+{
+	int ret;
+
+	if (size < 1 || size > 4)
+		return -EINVAL;
+

I am sure I mentioned this before: The calling code controls this, and it is a constant.
The check is pointless, and so is the size parameter in the first place as it is always
called with a length of 2. Besides, it accepts a size of 3 without error and is
thus wrong anyway.

+	mutex_lock(&priv->mutex);
+
+	ret = aqc_get_ctrl_data(priv);
+	if (ret < 0)
+		goto unlock_and_return;
+
+	switch (size) {
+	case 4:
+		put_unaligned_be32(val, priv->buffer + offset);
+		break;
+	case 2:
+		put_unaligned_be16((u16)val, priv->buffer + offset);
+		break;
+	case 1:
+		priv->buffer[offset] = val;
+		break;

Same here: values other than 2 are not used. I am not inclined to accept this.
If there is future code that needs sizes other than 2, add it when needed, not now.

+	default:
+		break;
+	}
+
+	ret = aqc_send_ctrl_data(priv);
+
+unlock_and_return:
+	mutex_unlock(&priv->mutex);
+	return ret;
+}
+
+static umode_t aqc_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel)
  {
  	const struct aqc_data *priv = data;
@@ -128,17 +334,47 @@ static umode_t aqc_is_visible(const void *data, enum hwmon_sensor_types type, u3
  				return 0444;
  			break;
  		case farbwerk360:
+		case octo:
  			return 0444;
  		default:
  			break;
  		}
  		break;
+	case hwmon_pwm:
+		switch (priv->kind) {
+		case octo:
+			switch (attr) {
+			case hwmon_pwm_input:
+				return 0644;
+			default:
+				break;
+			}
+			break;
+		default:
+			break;
+		}
+		break;
  	case hwmon_fan:
  	case hwmon_power:
-	case hwmon_in:
  	case hwmon_curr:
  		switch (priv->kind) {
  		case d5next:
+			if (channel < 2)
+				return 0444;
+			break;
+		case octo:
+			return 0444;
+		default:
+			break;
+		}
+		break;
+	case hwmon_in:
+		switch (priv->kind) {
+		case d5next:
+			if (channel < 3)
+				return 0444;
+			break;
+		case octo:
  			return 0444;
  		default:
  			break;
@@ -154,6 +390,7 @@ static umode_t aqc_is_visible(const void *data, enum hwmon_sensor_types type, u3
  static int aqc_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
  		    int channel, long *val)
  {
+	int ret;
  	struct aqc_data *priv = dev_get_drvdata(dev);
if (time_after(jiffies, priv->updated + STATUS_UPDATE_INTERVAL))
@@ -172,6 +409,18 @@ static int aqc_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
  	case hwmon_power:
  		*val = priv->power_input[channel];
  		break;
+	case hwmon_pwm:
+		switch (priv->kind) {
+		case octo:
+			ret = aqc_get_ctrl_val(priv, octo_ctrl_fan_offsets[channel]);
+			if (ret < 0)
+				return ret;
+
+			*val = aqc_percent_to_pwm(ret);
+		default:
+			break;

Please don't do that. While it  saves a line of code,
the additional break; statement after the case statement doesn't really hurt,
and you'd have to add a fallthrough; otherwise anyway. Same further below.

Guenter

+		}
+		break;
  	case hwmon_in:
  		*val = priv->voltage_input[channel];
  		break;
@@ -192,49 +441,51 @@ static int aqc_read_string(struct device *dev, enum hwmon_sensor_types type, u32
switch (type) {
  	case hwmon_temp:
-		switch (priv->kind) {
-		case d5next:
-			*str = L_D5NEXT_COOLANT_TEMP;
-			break;
-		case farbwerk360:
-			*str = label_temp_sensors[channel];
-			break;
-		default:
-			break;
-		}
+		*str = priv->temp_label[channel];
  		break;
  	case hwmon_fan:
-		switch (priv->kind) {
-		case d5next:
-			*str = label_d5next_speeds[channel];
-			break;
-		default:
-			break;
-		}
+		*str = priv->speed_label[channel];
  		break;
  	case hwmon_power:
-		switch (priv->kind) {
-		case d5next:
-			*str = label_d5next_power[channel];
-			break;
-		default:
-			break;
-		}
+		*str = priv->power_label[channel];
  		break;
  	case hwmon_in:
-		switch (priv->kind) {
-		case d5next:
-			*str = label_d5next_voltages[channel];
-			break;
-		default:
-			break;
-		}
+		*str = priv->voltage_label[channel];
  		break;
  	case hwmon_curr:
-		switch (priv->kind) {
-		case d5next:
-			*str = label_d5next_current[channel];
-			break;
+		*str = priv->current_label[channel];
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int aqc_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+		     long val)
+{
+	int ret, pwm_value;
+	struct aqc_data *priv = dev_get_drvdata(dev);
+
+	switch (type) {
+	case hwmon_pwm:
+		switch (attr) {
+		case hwmon_pwm_input:
+			switch (priv->kind) {
+			case octo:
+				pwm_value = aqc_pwm_to_percent(val);
+				if (pwm_value < 0)
+					return pwm_value;
+
+				ret = aqc_set_ctrl_val(priv, octo_ctrl_fan_offsets[channel],
+						       pwm_value, 2);
+				if (ret < 0)
+					return ret;
+				break;
+			default:
+				break;
+			}
  		default:
  			break;
  		}
@@ -250,6 +501,7 @@ static const struct hwmon_ops aqc_hwmon_ops = {
  	.is_visible = aqc_is_visible,
  	.read = aqc_read,
  	.read_string = aqc_read_string,
+	.write = aqc_write
  };
static const struct hwmon_channel_info *aqc_info[] = {
@@ -259,16 +511,48 @@ static const struct hwmon_channel_info *aqc_info[] = {
  			   HWMON_T_INPUT | HWMON_T_LABEL,
  			   HWMON_T_INPUT | HWMON_T_LABEL),
  	HWMON_CHANNEL_INFO(fan,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
  			   HWMON_F_INPUT | HWMON_F_LABEL,
  			   HWMON_F_INPUT | HWMON_F_LABEL),
  	HWMON_CHANNEL_INFO(power,
+			   HWMON_P_INPUT | HWMON_P_LABEL,
+			   HWMON_P_INPUT | HWMON_P_LABEL,
+			   HWMON_P_INPUT | HWMON_P_LABEL,
+			   HWMON_P_INPUT | HWMON_P_LABEL,
+			   HWMON_P_INPUT | HWMON_P_LABEL,
+			   HWMON_P_INPUT | HWMON_P_LABEL,
  			   HWMON_P_INPUT | HWMON_P_LABEL,
  			   HWMON_P_INPUT | HWMON_P_LABEL),
+	HWMON_CHANNEL_INFO(pwm,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT),
  	HWMON_CHANNEL_INFO(in,
+			   HWMON_I_INPUT | HWMON_I_LABEL,
+			   HWMON_I_INPUT | HWMON_I_LABEL,
+			   HWMON_I_INPUT | HWMON_I_LABEL,
+			   HWMON_I_INPUT | HWMON_I_LABEL,
+			   HWMON_I_INPUT | HWMON_I_LABEL,
  			   HWMON_I_INPUT | HWMON_I_LABEL,
  			   HWMON_I_INPUT | HWMON_I_LABEL,
  			   HWMON_I_INPUT | HWMON_I_LABEL),
  	HWMON_CHANNEL_INFO(curr,
+			   HWMON_C_INPUT | HWMON_C_LABEL,
+			   HWMON_C_INPUT | HWMON_C_LABEL,
+			   HWMON_C_INPUT | HWMON_C_LABEL,
+			   HWMON_C_INPUT | HWMON_C_LABEL,
+			   HWMON_C_INPUT | HWMON_C_LABEL,
+			   HWMON_C_INPUT | HWMON_C_LABEL,
  			   HWMON_C_INPUT | HWMON_C_LABEL,
  			   HWMON_C_INPUT | HWMON_C_LABEL),
  	NULL
@@ -326,6 +610,35 @@ static int aqc_raw_event(struct hid_device *hdev, struct hid_report *report, u8
  				priv->temp_input[i] = sensor_value * 10;
  		}
  		break;
+	case octo:
+		priv->power_cycles = get_unaligned_be32(data + OCTO_POWER_CYCLES);
+
+		/* Fan speed and related readings */
+		for (i = 0; i < OCTO_NUM_FANS; i++) {
+			priv->speed_input[i] =
+			    get_unaligned_be16(data + octo_sensor_fan_offsets[i] +
+					       OCTO_FAN_SPEED_OFFSET);
+			priv->power_input[i] =
+			    get_unaligned_be16(data + octo_sensor_fan_offsets[i] +
+					       OCTO_FAN_POWER_OFFSET) * 10000;
+			priv->voltage_input[i] =
+			    get_unaligned_be16(data + octo_sensor_fan_offsets[i] +
+					       OCTO_FAN_VOLTAGE_OFFSET) * 10;
+			priv->current_input[i] =
+			    get_unaligned_be16(data + octo_sensor_fan_offsets[i] +
+					       OCTO_FAN_CURRENT_OFFSET);
+		}
+
+		/* Temperature sensor readings */
+		for (i = 0; i < OCTO_NUM_SENSORS; i++) {
+			sensor_value = get_unaligned_be16(data + OCTO_SENSOR_START +
+							  i * OCTO_SENSOR_SIZE);
+			if (sensor_value == OCTO_SENSOR_DISCONNECTED)
+				priv->temp_input[i] = -ENODATA;
+			else
+				priv->temp_input[i] = sensor_value * 10;
+		}
+		break;
  	default:
  		break;
  	}
@@ -378,8 +691,13 @@ static void aqc_debugfs_init(struct aqc_data *priv)
  	debugfs_create_file("serial_number", 0444, priv->debugfs, priv, &serial_number_fops);
  	debugfs_create_file("firmware_version", 0444, priv->debugfs, priv, &firmware_version_fops);
- if (priv->kind == d5next)
+	switch (priv->kind) {
+	case d5next:
+	case octo:
  		debugfs_create_file("power_cycles", 0444, priv->debugfs, priv, &power_cycles_fops);

Same as above.

+	default:
+		break;
+	}
  }
#else
@@ -419,9 +737,30 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
  	switch (hdev->product) {
  	case USB_PRODUCT_ID_D5NEXT:
  		priv->kind = d5next;
+
+		priv->temp_label = label_d5next_temp;
+		priv->speed_label = label_d5next_speeds;
+		priv->power_label = label_d5next_power;
+		priv->voltage_label = label_d5next_voltages;
+		priv->current_label = label_d5next_current;
  		break;
  	case USB_PRODUCT_ID_FARBWERK360:
  		priv->kind = farbwerk360;
+
+		priv->temp_label = label_temp_sensors;
+		break;
+	case USB_PRODUCT_ID_OCTO:
+		priv->kind = octo;
+		priv->buffer_size = OCTO_CTRL_REPORT_SIZE;
+		priv->checksum_start = OCTO_CTRL_REPORT_CHECKSUM_START;
+		priv->checksum_length = OCTO_CTRL_REPORT_CHECKSUM_LENGTH;
+		priv->checksum_offset = OCTO_CTRL_REPORT_CHECKSUM_OFFSET;
+
+		priv->temp_label = label_temp_sensors;
+		priv->speed_label = label_fan_speed;
+		priv->power_label = label_fan_power;
+		priv->voltage_label = label_fan_voltage;
+		priv->current_label = label_fan_current;
  		break;
  	default:
  		break;
@@ -429,6 +768,12 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
priv->name = aqc_device_names[priv->kind]; + priv->buffer = devm_kzalloc(&hdev->dev, priv->buffer_size, GFP_KERNEL);
+	if (!priv->buffer)
+		return -ENOMEM;
+
+	mutex_init(&priv->mutex);
+
  	priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, priv->name, priv,
  							  &aqc_chip_info, NULL);
@@ -462,6 +807,7 @@ static void aqc_remove(struct hid_device *hdev)
  static const struct hid_device_id aqc_table[] = {
  	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_D5NEXT) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_FARBWERK360) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_OCTO) },
  	{ }
  };




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