linux-kernel - [PATCH v6 1/3] platform/chrome: update pwm fan control host commands

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Message-Id: <20250911-cros_ec_fan-v6-1-a1446cc098af@google.com>
Date: Thu, 11 Sep 2025 06:56:34 +0000
From: Sung-Chi Li via B4 Relay <devnull+lschyi.google.com@...nel.org>
To: Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Guenter Roeck <linux@...ck-us.net>, Jonathan Corbet <corbet@....net>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org, 
 Sung-Chi Li <lschyi@...gle.com>, Sung-Chi Li <lschyi@...omium.org>, 
 Tzung-Bi Shih <tzungbi@...nel.org>
Subject: [PATCH v6 1/3] platform/chrome: update pwm fan control host
 commands

From: Sung-Chi Li <lschyi@...omium.org>

Update cros_ec_commands.h to include definitions for getting PWM fan
duty, getting and setting the fan control mode.

Signed-off-by: Sung-Chi Li <lschyi@...omium.org>
Acked-by: Tzung-Bi Shih <tzungbi@...nel.org>
Reviewed-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 include/linux/platform_data/cros_ec_commands.h | 29 +++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index c19b404e3d8d9ec895a17838aa6e271e235f0823..69294f79cc88aaa6289af3f104743ff0d93ab753 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -1825,6 +1825,16 @@ struct ec_response_pwm_get_duty {
 	uint16_t duty;     /* Duty cycle, EC_PWM_MAX_DUTY = 100% */
 } __ec_align2;
 
+#define EC_CMD_PWM_GET_FAN_DUTY 0x0027
+
+struct ec_params_pwm_get_fan_duty {
+	uint8_t fan_idx;
+} __ec_align1;
+
+struct ec_response_pwm_get_fan_duty {
+	uint32_t percent; /* Percentage of duty cycle, ranging from 0 ~ 100 */
+} __ec_align4;
+
 /*****************************************************************************/
 /*
  * Lightbar commands. This looks worse than it is. Since we only use one HOST
@@ -3127,14 +3137,31 @@ struct ec_params_thermal_set_threshold_v1 {
 
 /****************************************************************************/
 
-/* Toggle automatic fan control */
+/* Set or get fan control mode */
 #define EC_CMD_THERMAL_AUTO_FAN_CTRL 0x0052
 
+enum ec_auto_fan_ctrl_cmd {
+	EC_AUTO_FAN_CONTROL_CMD_SET = 0,
+	EC_AUTO_FAN_CONTROL_CMD_GET,
+};
+
 /* Version 1 of input params */
 struct ec_params_auto_fan_ctrl_v1 {
 	uint8_t fan_idx;
 } __ec_align1;
 
+/* Version 2 of input params */
+struct ec_params_auto_fan_ctrl_v2 {
+	uint8_t fan_idx;
+	uint8_t cmd; /* enum ec_auto_fan_ctrl_cmd */
+	uint8_t set_auto; /* only used with EC_AUTO_FAN_CONTROL_CMD_SET - bool
+			   */
+} __ec_align4;
+
+struct ec_response_auto_fan_control {
+	uint8_t is_auto; /* bool */
+} __ec_align1;
+
 /* Get/Set TMP006 calibration data */
 #define EC_CMD_TMP006_GET_CALIBRATION 0x0053
 #define EC_CMD_TMP006_SET_CALIBRATION 0x0054

-- 
2.51.0.384.g4c02a37b29-goog