[PATCH 4/5] scsi: ufs-thermal: implement thermal file ops

[Avi Shchislowski <avi.shchislowski@wdc.com>]

The thermal interface adds a new thermal zone device sensor under
/sys/class/thermal/ folder.

Signed-off-by: Uri Yanai <uri.yanai@wdc.com>
Signed-off-by: Avi Shchislowski <avi.shchislowski@wdc.com>
---
 drivers/scsi/ufs/ufs-thermal.c | 122 ++++++++++++++++++++++++++++++++++++++---
 drivers/scsi/ufs/ufs.h         |   3 +
 2 files changed, 117 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-thermal.c b/drivers/scsi/ufs/ufs-thermal.c
index dfa5d68..23e4ac1 100644
--- a/drivers/scsi/ufs/ufs-thermal.c
+++ b/drivers/scsi/ufs/ufs-thermal.c
@@ -31,6 +31,99 @@ enum {
 		}
 };
 
+#define attr2milicelcius(attr) (((0xFF & attr) - 80) * 1000)
+
+static int ufs_thermal_get_temp(struct thermal_zone_device *device,
+				  int *temperature)
+{
+	struct ufs_hba *hba = (struct ufs_hba *)device->devdata;
+	u32 temp;
+	int err;
+
+	err = ufshcd_query_attr(hba,
+			UPIU_QUERY_OPCODE_READ_ATTR,
+			QUERY_ATTR_IDN_ROUGH_TEMP,
+			0, 0, &temp);
+	if (err)
+		return -EINVAL;
+
+	*temperature = attr2milicelcius(temp);
+	return 0;
+}
+
+static int ufs_thermal_get_trip_temp(
+		struct thermal_zone_device *device,
+				 int trip, int *temp)
+{
+
+	if (trip < 0 || trip >= UFS_THERM_MAX_TRIPS)
+		return -EINVAL;
+
+	*temp = thermal.trip[trip];
+
+	return 0;
+}
+
+static int ufs_thermal_get_trip_type(
+		struct thermal_zone_device *device,
+		int trip, enum thermal_trip_type *type)
+{
+	if (trip < 0 || trip >= UFS_THERM_MAX_TRIPS)
+		return -EINVAL;
+
+	*type = THERMAL_TRIP_PASSIVE;
+
+	return 0;
+}
+
+static int ufs_thermal_get_boundary(struct ufs_hba *hba,
+					int trip, int *boundary)
+{
+	enum attr_idn idn;
+	int err = 0;
+	u32 val;
+
+	idn = trip == UFS_THERM_HIGH_TEMP ?
+			QUERY_ATTR_IDN_TOO_HIGH_TEMP :
+			QUERY_ATTR_IDN_TOO_LOW_TEMP;
+
+	err = ufshcd_query_attr(hba,
+			UPIU_QUERY_OPCODE_READ_ATTR,
+			idn, 0, 0, &val);
+	if (err) {
+		dev_err(hba->dev,
+		"Failed to get device too %s temperature boundary\n",
+		trip == UFS_THERM_HIGH_TEMP ? "high" : "low");
+		goto out;
+	}
+
+	if (val < 1 || val > 250) {
+		dev_err(hba->dev, "out of device temperature boundary\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	*boundary = attr2milicelcius(val);
+
+out:
+	return err;
+}
+
+static int ufs_thermal_set_trip(struct ufs_hba *hba, int trip)
+{
+	int temp;
+	int err = 0;
+
+	err = ufs_thermal_get_boundary(hba, trip, &temp);
+	if (err)
+		return err;
+
+	thermal.trip[trip] = temp;
+
+	return err;
+
+}
+
 void ufs_thermal_exception_event_handler(struct ufs_hba *hba,
 		u32 exception_status)
 {
@@ -46,17 +139,12 @@ void ufs_thermal_exception_event_handler(struct ufs_hba *hba,
 	}
 }
 
-static  struct thermal_zone_device_ops ufs_thermal_ops = {
-	.get_temp = NULL,
-	.get_trip_temp = NULL,
-	.get_trip_type = NULL,
-};
-
 static int ufs_thermal_enable_ee(struct ufs_hba *hba)
 {
 	return ufshcd_enable_ee(hba, MASK_EE_URGENT_TEMP);
 }
 
+
 static void ufs_thermal_zone_unregister(struct ufs_hba *hba)
 {
 	if (thermal.zone) {
@@ -66,7 +154,13 @@ static void ufs_thermal_zone_unregister(struct ufs_hba *hba)
 	}
 }
 
-static int ufs_thermal_register(struct ufs_hba *hba)
+static  struct thermal_zone_device_ops ufs_thermal_ops = {
+	.get_temp = ufs_thermal_get_temp,
+	.get_trip_temp = ufs_thermal_get_trip_temp,
+	.get_trip_type = ufs_thermal_get_trip_type,
+};
+
+static int ufs_thermal_register(struct ufs_hba *hba, u8 ufs_features)
 {
 	int err = 0;
 	char name[THERMAL_NAME_LENGTH] = {};
@@ -74,6 +168,18 @@ static int ufs_thermal_register(struct ufs_hba *hba)
 	snprintf(name, THERMAL_NAME_LENGTH, "ufs_storage_%d",
 			hba->host->host_no);
 
+	if (ufs_features & UFS_FEATURE_HTEMP) {
+		err = ufs_thermal_set_trip(hba, UFS_THERM_HIGH_TEMP);
+		if (err)
+			goto out;
+	}
+
+	if (ufs_features & UFS_FEATURE_LTEMP) {
+		err = ufs_thermal_set_trip(hba, UFS_THERM_LOW_TEMP);
+		if (err)
+			goto out;
+	}
+
 	thermal.zone = thermal_zone_device_register(name, UFS_THERM_MAX_TRIPS,
 			0, hba, &ufs_thermal_ops, NULL, 0, 0);
 	if (IS_ERR(thermal.zone)) {
@@ -122,7 +228,7 @@ int ufs_thermal_probe(struct ufs_hba *hba)
 	if (!ufs_features)
 		goto out;
 
-	err = ufs_thermal_register(hba);
+	err = ufs_thermal_register(hba, ufs_features);
 	if (err)
 		goto out;
 
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 8fc0b0c..9f8224b 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -167,6 +167,9 @@ enum attr_idn {
 	QUERY_ATTR_IDN_FFU_STATUS		= 0x14,
 	QUERY_ATTR_IDN_PSA_STATE		= 0x15,
 	QUERY_ATTR_IDN_PSA_DATA_SIZE		= 0x16,
+	QUERY_ATTR_IDN_ROUGH_TEMP		= 0x18,
+	QUERY_ATTR_IDN_TOO_HIGH_TEMP		= 0x19,
+	QUERY_ATTR_IDN_TOO_LOW_TEMP		= 0x1A,
 };
 
 /* Descriptor idn for Query requests */
-- 
1.9.1