mfd: cros_ec: Fix temperature API

Improve API to retrieve temperature information.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

include/linux/mfd/cros_ec_commands.h

@@ -2945,9 +2945,28 @@ enum ec_temp_thresholds {
 /*
  * Thermal configuration for one temperature sensor. Temps are in degrees K.
  * Zero values will be silently ignored by the thermal task.
+ *
+ * Set 'temp_host' value allows thermal task to trigger some event with 1 degree
+ * hysteresis.
+ * For example,
+ *	temp_host[EC_TEMP_THRESH_HIGH] = 300 K
+ *	temp_host_release[EC_TEMP_THRESH_HIGH] = 0 K
+ * EC will throttle ap when temperature >= 301 K, and release throttling when
+ * temperature <= 299 K.
+ *
+ * Set 'temp_host_release' value allows thermal task has a custom hysteresis.
+ * For example,
+ *	temp_host[EC_TEMP_THRESH_HIGH] = 300 K
+ *	temp_host_release[EC_TEMP_THRESH_HIGH] = 295 K
+ * EC will throttle ap when temperature >= 301 K, and release throttling when
+ * temperature <= 294 K.
+ *
+ * Note that this structure is a sub-structure of
+ * ec_params_thermal_set_threshold_v1, but maintains its alignment there.
  */
 struct ec_thermal_config {
 	uint32_t temp_host[EC_TEMP_THRESH_COUNT]; /* levels of hotness */
+	uint32_t temp_host_release[EC_TEMP_THRESH_COUNT]; /* release levels */
 	uint32_t temp_fan_off;		/* no active cooling needed */
 	uint32_t temp_fan_max;		/* max active cooling needed */
 } __ec_align4;
@@ -2973,32 +2992,63 @@ struct ec_params_thermal_set_threshold_v1 {
 /* Toggle automatic fan control */
 #define EC_CMD_THERMAL_AUTO_FAN_CTRL 0x0052
 
-/* Get TMP006 calibration data */
+/* Version 1 of input params */
+struct ec_params_auto_fan_ctrl_v1 {
+	uint8_t fan_idx;
+} __ec_align1;
+
+/* Get/Set TMP006 calibration data */
 #define EC_CMD_TMP006_GET_CALIBRATION 0x0053
+#define EC_CMD_TMP006_SET_CALIBRATION 0x0054
+
+/*
+ * The original TMP006 calibration only needed four params, but now we need
+ * more. Since the algorithm is nothing but magic numbers anyway, we'll leave
+ * the params opaque. The v1 "get" response will include the algorithm number
+ * and how many params it requires. That way we can change the EC code without
+ * needing to update this file. We can also use a different algorithm on each
+ * sensor.
+ */
 
+/* This is the same struct for both v0 and v1. */
 struct ec_params_tmp006_get_calibration {
 	uint8_t index;
 } __ec_align1;
 
-struct ec_response_tmp006_get_calibration {
+/* Version 0 */
+struct ec_response_tmp006_get_calibration_v0 {
 	float s0;
 	float b0;
 	float b1;
 	float b2;
 } __ec_align4;
 
-/* Set TMP006 calibration data */
-#define EC_CMD_TMP006_SET_CALIBRATION 0x0054
-
-struct ec_params_tmp006_set_calibration {
+struct ec_params_tmp006_set_calibration_v0 {
 	uint8_t index;
-	uint8_t reserved[3];  /* Reserved; set 0 */
+	uint8_t reserved[3];
 	float s0;
 	float b0;
 	float b1;
 	float b2;
 } __ec_align4;
 
+/* Version 1 */
+struct ec_response_tmp006_get_calibration_v1 {
+	uint8_t algorithm;
+	uint8_t num_params;
+	uint8_t reserved[2];
+	float val[0];
+} __ec_align4;
+
+struct ec_params_tmp006_set_calibration_v1 {
+	uint8_t index;
+	uint8_t algorithm;
+	uint8_t num_params;
+	uint8_t reserved;
+	float val[0];
+} __ec_align4;
+
+
 /* Read raw TMP006 data */
 #define EC_CMD_TMP006_GET_RAW 0x0055