[PATCH 2/3] hwmon: (cros_ec) Add reading target fan RPM function
From: Sung-Chi Li
Date: Thu Mar 13 2025 - 00:48:31 EST
Implement the functionality of reading the target fan RPM setting from
ChromeOS embedded controller under framework.
Signed-off-by: Sung-Chi Li <lschyi@xxxxxxxxxxxx>
---
drivers/hwmon/cros_ec_hwmon.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/hwmon/cros_ec_hwmon.c b/drivers/hwmon/cros_ec_hwmon.c
index b2fec0768301f116f49c57b8dbfb042b98a573e1..73bfcbbaf9531be6b753cfef8045fd5dab5b2ab3 100644
--- a/drivers/hwmon/cros_ec_hwmon.c
+++ b/drivers/hwmon/cros_ec_hwmon.c
@@ -36,6 +36,19 @@ static int cros_ec_hwmon_read_fan_speed(struct cros_ec_device *cros_ec, u8 index
return 0;
}
+static int cros_ec_hwmon_read_fan_target(struct cros_ec_device *cros_ec, u8 index, int32_t *speed)
+{
+ int ret;
+ struct ec_response_pwm_get_fan_rpm r;
+
+ ret = cros_ec_cmd(cros_ec, 0, EC_CMD_PWM_GET_FAN_TARGET_RPM, NULL, 0, &r, sizeof(r));
+ if (ret < 0)
+ return ret;
+
+ *speed = le32_to_cpu(r.rpm);
+ return 0;
+}
+
static int cros_ec_hwmon_read_temp(struct cros_ec_device *cros_ec, u8 index, u8 *temp)
{
unsigned int offset;
@@ -95,6 +108,7 @@ static int cros_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
{
struct cros_ec_hwmon_priv *priv = dev_get_drvdata(dev);
int ret = -EOPNOTSUPP;
+ int32_t target_rpm;
u16 speed;
u8 temp;
@@ -111,6 +125,10 @@ static int cros_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
ret = cros_ec_hwmon_read_fan_speed(priv->cros_ec, channel, &speed);
if (ret == 0)
*val = cros_ec_hwmon_is_error_fan(speed);
+ } else if (attr == hwmon_fan_target) {
+ ret = cros_ec_hwmon_read_fan_target(priv->cros_ec, channel, &target_rpm);
+ if (ret == 0)
+ *val = target_rpm;
}
} else if (type == hwmon_temp) {
if (attr == hwmon_temp_input) {
--
2.49.0.rc0.332.g42c0ae87b1-goog