hwmon: (aquacomputer_d5next) Add support for Aquacomputer High Flow USB and MPS Flow

Extend aquacomputer_d5next driver to expose various hardware sensors of the
Aquacomputer High Flow USB flow sensor, which communicates through a
proprietary USB HID protocol. This commit also adds support for the sensors
of the MPS Flow devices, as they have the same USB product ID and sensor
layouts. Implemented by Leonard Anderweit [1].

Internal and external temp sensor readings are available, along with
the flow sensor.

Additionally, serial number and firmware version are exposed through
debugfs.

[1] https://github.com/aleksamagicka/aquacomputer_d5next-hwmon/pull/90

Originally-from: Leonard Anderweit <leonard.anderweit@gmail.com>
Signed-off-by: Aleksa Savic <savicaleksa83@gmail.com>
Link: https://lore.kernel.org/r/20231016083559.139341-3-savicaleksa83@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/aquacomputer_d5next.rst

@@ -16,6 +16,8 @@ Supported devices:
 * Aquacomputer Aquastream XT watercooling pump
 * Aquacomputer Aquastream Ultimate watercooling pump
 * Aquacomputer Poweradjust 3 fan controller
+* Aquacomputer High Flow USB flow meter
+* Aquacomputer MPS Flow devices
 
 Author: Aleksa Savic
 
@@ -73,6 +75,11 @@ It also exposes pressure and flow speed readings.
 
 The Poweradjust 3 controller exposes a single external temperature sensor.
 
+The High Flow USB exposes an internal and external temperature sensor, and a flow meter.
+
+The MPS Flow devices expose the same entries as the High Flow USB because they have
+the same USB product ID and report sensors equivalently.
+
 Depending on the device, not all sysfs and debugfs entries will be available.
 Writing to virtual temperature sensors is not currently supported.
 

drivers/hwmon/aquacomputer_d5next.c

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * hwmon driver for Aquacomputer devices (D5 Next, Farbwerk, Farbwerk 360, Octo,
- * Quadro, High Flow Next, Aquaero, Aquastream Ultimate, Leakshield)
+ * Quadro, High Flow Next, Aquaero, Aquastream Ultimate, Leakshield,
+ * High Flow USB/MPS Flow family)
  *
  * Aquacomputer devices send HID reports (with ID 0x01) every second to report
  * sensor values, except for devices that communicate through the
- * legacy way (currently, Poweradjust 3).
+ * legacy way (currently, Poweradjust 3 and High Flow USB/MPS Flow family).
  *
  * Copyright 2021 Aleksa Savic <savicaleksa83@gmail.com>
  * Copyright 2022 Jack Doan <me@jackdoan.com>
@@ -35,11 +36,12 @@
 #define USB_PRODUCT_ID_AQUASTREAMXT	0xf0b6
 #define USB_PRODUCT_ID_AQUASTREAMULT	0xf00b
 #define USB_PRODUCT_ID_POWERADJUST3	0xf0bd
+#define USB_PRODUCT_ID_HIGHFLOW		0xf003
 
 enum kinds {
 	d5next, farbwerk, farbwerk360, octo, quadro,
 	highflownext, aquaero, poweradjust3, aquastreamult,
-	aquastreamxt, leakshield
+	aquastreamxt, leakshield, highflow
 };
 
 static const char *const aqc_device_names[] = {
@@ -53,7 +55,8 @@ static const char *const aqc_device_names[] = {
 	[aquastreamxt] = "aquastreamxt",
 	[aquaero] = "aquaero",
 	[aquastreamult] = "aquastreamultimate",
-	[poweradjust3] = "poweradjust3"
+	[poweradjust3] = "poweradjust3",
+	[highflow] = "highflow" /* Covers MPS Flow devices */
 };
 
 #define DRIVER_NAME			"aquacomputer_d5next"
@@ -90,6 +93,8 @@ static u8 aquaero_secondary_ctrl_report[] = {
 
 #define POWERADJUST3_STATUS_REPORT_ID	0x03
 
+#define HIGHFLOW_STATUS_REPORT_ID	0x02
+
 /* Data types for reading and writing control reports */
 #define AQC_8		0
 #define AQC_BE16	1
@@ -282,6 +287,17 @@ static u16 aquastreamxt_sensor_fan_offsets[] = { 0x13, 0x1b };
 /* Sensor report offsets for the Poweradjust 3 */
 #define POWERADJUST3_SENSOR_START	0x03
 
+/* Specs of the High Flow USB */
+#define HIGHFLOW_NUM_SENSORS		2
+#define HIGHFLOW_NUM_FLOW_SENSORS	1
+#define HIGHFLOW_SENSOR_REPORT_SIZE	0x76
+
+/* Sensor report offsets for the High Flow USB */
+#define HIGHFLOW_FIRMWARE_VERSION	0x3
+#define HIGHFLOW_SERIAL_START		0x9
+#define HIGHFLOW_FLOW_SENSOR_OFFSET	0x23
+#define HIGHFLOW_SENSOR_START		0x2b
+
 /* Labels for D5 Next */
 static const char *const label_d5next_temp[] = {
 	"Coolant temp"
@@ -486,6 +502,16 @@ static const char *const label_poweradjust3_temp_sensors[] = {
 	"External sensor"
 };
 
+/* Labels for Highflow */
+static const char *const label_highflow_temp[] = {
+	"External temp",
+	"Internal temp"
+};
+
+static const char *const label_highflow_speeds[] = {
+	"Flow speed [dL/h]"
+};
+
 struct aqc_fan_structure_offsets {
 	u8 voltage;
 	u8 curr;
@@ -819,6 +845,7 @@ static umode_t aqc_is_visible(const void *data, enum hwmon_sensor_types type, u3
 				break;
 			case aquaero:
 			case quadro:
+			case highflow:
 				/* Special case to support flow sensors */
 				if (channel < priv->num_fans + priv->num_flow_sensors)
 					return 0444;
@@ -962,6 +989,17 @@ static int aqc_legacy_read(struct aqc_data *priv)
 		sensor_value = get_unaligned_le16(priv->buffer + AQUASTREAMXT_FAN_VOLTAGE_OFFSET);
 		priv->voltage_input[1] = DIV_ROUND_CLOSEST(sensor_value * 1000, 63);
 		break;
+	case highflow:
+		/* Info provided with every report */
+		priv->serial_number[0] = get_unaligned_le16(priv->buffer +
+							    priv->serial_number_start_offset);
+		priv->firmware_version =
+		    get_unaligned_le16(priv->buffer + priv->firmware_version_offset);
+
+		/* Read flow speed */
+		priv->speed_input[0] = get_unaligned_le16(priv->buffer +
+							  priv->flow_sensors_start_offset);
+		break;
 	default:
 		break;
 	}
@@ -1747,6 +1785,20 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 		priv->temp_label = label_poweradjust3_temp_sensors;
 		break;
+	case USB_PRODUCT_ID_HIGHFLOW:
+		priv->kind = highflow;
+
+		priv->num_fans = 0;
+
+		priv->num_temp_sensors = HIGHFLOW_NUM_SENSORS;
+		priv->temp_sensor_start_offset = HIGHFLOW_SENSOR_START;
+		priv->num_flow_sensors = HIGHFLOW_NUM_FLOW_SENSORS;
+		priv->flow_sensors_start_offset = HIGHFLOW_FLOW_SENSOR_OFFSET;
+		priv->buffer_size = HIGHFLOW_SENSOR_REPORT_SIZE;
+
+		priv->temp_label = label_highflow_temp;
+		priv->speed_label = label_highflow_speeds;
+		break;
 	default:
 		break;
 	}
@@ -1772,6 +1824,12 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 		priv->status_report_id = AQUASTREAMXT_STATUS_REPORT_ID;
 		break;
+	case highflow:
+		priv->serial_number_start_offset = HIGHFLOW_SERIAL_START;
+		priv->firmware_version_offset = HIGHFLOW_FIRMWARE_VERSION;
+
+		priv->status_report_id = HIGHFLOW_STATUS_REPORT_ID;
+		break;
 	default:
 		priv->serial_number_start_offset = AQC_SERIAL_START;
 		priv->firmware_version_offset = AQC_FIRMWARE_VERSION;
@@ -1846,6 +1904,7 @@ static const struct hid_device_id aqc_table[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_AQUASTREAMXT) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_AQUASTREAMULT) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_POWERADJUST3) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_AQUACOMPUTER, USB_PRODUCT_ID_HIGHFLOW) },
 	{ }
 };