[PATCH 5/5] hwmon: (aquacomputer_d5next) Add PWM mode control for Aquaero

[Leonard Anderweit <leonard.anderweit@gmail.com>]

Add PWM mode control for the Aquacomputer Aquaero. On the Aquaero 6 all four
ports can switch between DC and PWM control. On the Aquaero 5 this is only
supported for the fourth port, but changing the setting for the other ports has
no consequences.

Signed-off-by: Leonard Anderweit <leonard.anderweit@gmail.com>
---
 Documentation/hwmon/aquacomputer_d5next.rst |  4 +-
 drivers/hwmon/aquacomputer_d5next.c         | 86 ++++++++++++++++-----
 2 files changed, 70 insertions(+), 20 deletions(-)

diff --git a/Documentation/hwmon/aquacomputer_d5next.rst b/Documentation/hwmon/aquacomputer_d5next.rst
index 2dbb3bd37878..002cb9eecdf5 100644
--- a/Documentation/hwmon/aquacomputer_d5next.rst
+++ b/Documentation/hwmon/aquacomputer_d5next.rst
@@ -26,7 +26,8 @@ communicate through proprietary USB HID protocols.
 The Aquaero devices expose eight physical, eight virtual and four calculated
 virtual temperature sensors, as well as two flow sensors. The fans expose their
 speed (in RPM), power, voltage and current. The temperature offset and the fan speed
-can be controlled.
+can be controlled. The fan PWM mode (DC/PWM) can be controlled. The Aquaero 6 supports
+this on all four fan connectors and the Aquaero 5 only on the fourth connector.
 
 For the D5 Next pump, available sensors are pump and fan speed, power, voltage
 and current, as well as coolant temperature and eight virtual temp sensors. Also
@@ -83,6 +84,7 @@ power[1-8]_input Pump/fan power (in micro Watts)
 in[0-7]_input    Pump/fan voltage (in milli Volts)
 curr[1-8]_input  Pump/fan current (in milli Amperes)
 pwm[1-8]         Fan PWM (0 - 255)
+pwm[1-4]_mode    Fan control mode (0: DC mode; 1: PWM mode)
 ================ ==============================================================
 
 Debugfs entries
diff --git a/drivers/hwmon/aquacomputer_d5next.c b/drivers/hwmon/aquacomputer_d5next.c
index 02551c26918a..2ec00124785f 100644
--- a/drivers/hwmon/aquacomputer_d5next.c
+++ b/drivers/hwmon/aquacomputer_d5next.c
@@ -123,6 +123,7 @@ static u16 aquaero_sensor_fan_offsets[] = { 0x167, 0x173, 0x17f, 0x18B };
 #define AQUAERO_TEMP_CTRL_OFFSET	0xdb
 #define AQUAERO_FAN_CTRL_MIN_PWR_OFFSET	0x04
 #define AQUAERO_FAN_CTRL_MAX_PWR_OFFSET	0x06
+#define AQUAERO_FAN_CTRL_MODE_OFFSET	0x0f
 #define AQUAERO_FAN_CTRL_SRC_OFFSET	0x10
 static u16 aquaero_ctrl_fan_offsets[] = { 0x20c, 0x220, 0x234, 0x248 };
 
@@ -672,10 +673,23 @@ static umode_t aqc_is_visible(const void *data, enum hwmon_sensor_types type, u3
 		break;
 	case hwmon_pwm:
 		if (priv->fan_ctrl_offsets && channel < priv->num_fans) {
-			switch (attr) {
-			case hwmon_pwm_input:
-				return 0644;
+			switch (priv->kind) {
+			case aquaero:
+				switch (attr) {
+				case hwmon_pwm_input:
+				case hwmon_pwm_mode:
+					return 0644;
+				default:
+					break;
+				}
+				break;
 			default:
+				switch (attr) {
+				case hwmon_pwm_input:
+					return 0644;
+				default:
+					break;
+				}
 				break;
 			}
 		}
@@ -863,22 +877,46 @@ static int aqc_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 		*val = priv->power_input[channel];
 		break;
 	case hwmon_pwm:
-		switch (priv->kind) {
-		case aquaero:
-			ret = aqc_get_ctrl_val(priv, AQUAERO_CTRL_PRESET_START + channel * AQUAERO_CTRL_PRESET_SIZE,
-					       val, AQC_BE16);
-			if (ret < 0)
-				return ret;
-			*val = aqc_percent_to_pwm(*val);
+		switch (attr) {
+		case hwmon_pwm_input:
+			switch (priv->kind) {
+			case aquaero:
+				ret = aqc_get_ctrl_val(priv, AQUAERO_CTRL_PRESET_START +
+						       channel * AQUAERO_CTRL_PRESET_SIZE,
+						       val, AQC_BE16);
+				if (ret < 0)
+					return ret;
+				*val = aqc_percent_to_pwm(*val);
+				break;
+			default:
+				ret = aqc_get_ctrl_val(priv, priv->fan_ctrl_offsets[channel],
+						       val, AQC_BE16);
+				if (ret < 0)
+					return ret;
+
+				*val = aqc_percent_to_pwm(ret);
+				break;
+			}
 			break;
-		default:
-			ret = aqc_get_ctrl_val(priv, priv->fan_ctrl_offsets[channel],
-					       val, AQC_BE16);
+		case hwmon_pwm_mode:
+			ret = aqc_get_ctrl_val(priv,
+					       priv->fan_ctrl_offsets[channel] +
+					       AQUAERO_FAN_CTRL_MODE_OFFSET, val, AQC_8);
 			if (ret < 0)
 				return ret;
 
-			*val = aqc_percent_to_pwm(ret);
+			switch (*val) {
+			case 0:	/* DC mode */
+				break;
+			case 2:	/* PWM mode */
+				*val = 1;
+				break;
+			default:
+				break;
+			}
 			break;
+		default:
+			return -EOPNOTSUPP;
 		}
 		break;
 	case hwmon_in:
@@ -936,7 +974,7 @@ static int aqc_read_string(struct device *dev, enum hwmon_sensor_types type, u32
 static int aqc_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
 		     long val)
 {
-	int ret, pwm_value;
+	int ret, pwm_value, ctrl_mode;
 	/* Arrays for setting multiple values at once in the control report */
 	int ctrl_values_offsets[4];
 	long ctrl_values[4];
@@ -1018,6 +1056,16 @@ static int aqc_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 				break;
 			}
 			break;
+		case hwmon_pwm_mode:
+			if (val > 1 || val < 0)
+				return -EINVAL;
+			ctrl_mode = 2 * val;
+			ret = aqc_set_ctrl_val(priv,
+					       priv->fan_ctrl_offsets[channel] +
+					       AQUAERO_FAN_CTRL_MODE_OFFSET, ctrl_mode, AQC_8);
+			if (ret < 0)
+				return ret;
+			break;
 		default:
 			break;
 		}
@@ -1077,10 +1125,10 @@ static const struct hwmon_channel_info *aqc_info[] = {
 			   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_MODE,
+			   HWMON_PWM_INPUT | HWMON_PWM_MODE,
+			   HWMON_PWM_INPUT | HWMON_PWM_MODE,
+			   HWMON_PWM_INPUT | HWMON_PWM_MODE,
 			   HWMON_PWM_INPUT,
 			   HWMON_PWM_INPUT,
 			   HWMON_PWM_INPUT,
-- 
2.39.1