thermal: tsens: Update TSENS property for reading efuse data

TSENS (temperature sensor) controller provides capability
to program the gain and offset for individual sensors so that
the controller reports the temperature. The efuse information
for gain and offset can be read during boot and programmed
at boot initialization and the application TSENS driver
does not need to support reading from the efuse region.
Update the property for reading the tsens efuse as optional
for such cases.

Change-Id: Icd637fcd264565b06bcb90f8e6f7b26c8d112f24
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>

1 files changed, 33 insertions, 27 deletions

diff --git a/drivers/thermal/msm-tsens.c b/drivers/thermal/msm-tsens.c
index 73d7435d2eb8..97ab02dfc753 100644
--- a/drivers/thermal/msm-tsens.c
+++ b/drivers/thermal/msm-tsens.c
@@ -831,6 +831,7 @@ struct tsens_tm_device {
 	bool				prev_reading_avail;
 	bool				calibration_less_mode;
 	bool				tsens_local_init;
+	bool				gain_offset_programmed;
 	int				tsens_factor;
 	uint32_t			tsens_num_sensor;
 	int				tsens_irq;
@@ -5341,17 +5342,25 @@ static int get_device_tree_data(struct platform_device *pdev,
 		return -ENODEV;
 	}
 
-	tsens_slope_data = devm_kzalloc(&pdev->dev,
+	/* TSENS calibration region */
+	tmdev->res_calib_mem = platform_get_resource_byname(pdev,
+				IORESOURCE_MEM, "tsens_eeprom_physical");
+	if (!tmdev->res_calib_mem) {
+		pr_debug("Using controller programmed gain and offset\n");
+		tmdev->gain_offset_programmed = true;
+	} else {
+		tsens_slope_data = devm_kzalloc(&pdev->dev,
 			tsens_num_sensors * sizeof(u32), GFP_KERNEL);
-	if (!tsens_slope_data)
-		return -ENOMEM;
+		if (!tsens_slope_data)
+			return -ENOMEM;
 
-	rc = of_property_read_u32_array(of_node,
-		"qcom,slope", tsens_slope_data, tsens_num_sensors);
-	if (rc) {
-		dev_err(&pdev->dev, "invalid or missing property: tsens-slope\n");
-		return rc;
-	};
+		rc = of_property_read_u32_array(of_node,
+			"qcom,slope", tsens_slope_data, tsens_num_sensors);
+		if (rc) {
+			dev_err(&pdev->dev, "missing property: tsens-slope\n");
+			return rc;
+		};
+	}
 
 	if (!of_match_node(tsens_match, of_node)) {
 		pr_err("Need to read SoC specific fuse map\n");
@@ -5364,9 +5373,13 @@ static int get_device_tree_data(struct platform_device *pdev,
 		return -ENODEV;
 	}
 
-	for (i = 0; i < tsens_num_sensors; i++)
-		tmdev->sensor[i].slope_mul_tsens_factor = tsens_slope_data[i];
-	tmdev->tsens_factor = TSENS_SLOPE_FACTOR;
+	if (!tmdev->gain_offset_programmed) {
+		for (i = 0; i < tsens_num_sensors; i++)
+			tmdev->sensor[i].slope_mul_tsens_factor =
+							tsens_slope_data[i];
+		tmdev->tsens_factor = TSENS_SLOPE_FACTOR;
+	}
+
 	tmdev->tsens_num_sensor = tsens_num_sensors;
 	tmdev->calibration_less_mode = of_property_read_bool(of_node,
 				"qcom,calibration-less-mode");
@@ -5536,24 +5549,17 @@ static int get_device_tree_data(struct platform_device *pdev,
 		goto fail_unmap_tsens_region;
 	}
 
-	/* TSENS calibration region */
-	tmdev->res_calib_mem = platform_get_resource_byname(pdev,
-				IORESOURCE_MEM, "tsens_eeprom_physical");
-	if (!tmdev->res_calib_mem) {
-		pr_err("Could not get qfprom physical address resource\n");
-		rc = -EINVAL;
-		goto fail_unmap_tsens;
-	}
-
-	tmdev->calib_len = tmdev->res_calib_mem->end -
+	if (!tmdev->gain_offset_programmed) {
+		tmdev->calib_len = tmdev->res_calib_mem->end -
 					tmdev->res_calib_mem->start + 1;
 
-	tmdev->tsens_calib_addr = ioremap(tmdev->res_calib_mem->start,
+		tmdev->tsens_calib_addr = ioremap(tmdev->res_calib_mem->start,
 						tmdev->calib_len);
-	if (!tmdev->tsens_calib_addr) {
-		pr_err("Failed to IO map EEPROM registers.\n");
-		rc = -EINVAL;
-		goto fail_unmap_tsens;
+		if (!tmdev->tsens_calib_addr) {
+			pr_err("Failed to IO map EEPROM registers.\n");
+			rc = -EINVAL;
+			goto fail_unmap_tsens;
+		}
 	}
 
 	return 0;