add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/thermal/thermal-generic-adc.c
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@@ -1,13 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Generic ADC thermal driver
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  *
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  * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
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  *
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  * Author: Laxman Dewangan <ldewangan@nvidia.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/iio/consumer.h>
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 #include <linux/kernel.h>
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@@ -28,6 +25,9 @@
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 {
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 	int temp, temp_hi, temp_lo, adc_hi, adc_lo;
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 	int i;
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+
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+	if (!gti->lookup_table)
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+		return val;
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 	for (i = 0; i < gti->nlookup_table; i++) {
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 		if (val >= gti->lookup_table[2 * i + 1])
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@@ -76,14 +76,18 @@
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 						 struct gadc_thermal_info *gti)
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 {
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 	struct device_node *np = dev->of_node;
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+	enum iio_chan_type chan_type;
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 	int ntable;
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 	int ret;
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 	ntable = of_property_count_elems_of_size(np, "temperature-lookup-table",
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 						 sizeof(u32));
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-	if (ntable < 0) {
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-		dev_err(dev, "Lookup table is not provided\n");
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-		return ntable;
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+	if (ntable <= 0) {
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+		ret = iio_get_channel_type(gti->channel, &chan_type);
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+		if (ret || chan_type != IIO_TEMP)
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+			dev_notice(dev,
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+				   "no lookup table, assuming DAC channel returns milliCelcius\n");
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+		return 0;
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 	}
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 	if (ntable % 2) {
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@@ -124,6 +128,14 @@
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 	if (!gti)
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 		return -ENOMEM;
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+	gti->channel = devm_iio_channel_get(&pdev->dev, "sensor-channel");
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+	if (IS_ERR(gti->channel)) {
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+		ret = PTR_ERR(gti->channel);
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+		if (ret != -EPROBE_DEFER)
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+			dev_err(&pdev->dev, "IIO channel not found: %d\n", ret);
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+		return ret;
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+	}
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+
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 	ret = gadc_thermal_read_linear_lookup_table(&pdev->dev, gti);
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 	if (ret < 0)
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 		return ret;
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@@ -131,19 +143,14 @@
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 	gti->dev = &pdev->dev;
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 	platform_set_drvdata(pdev, gti);
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-	gti->channel = devm_iio_channel_get(&pdev->dev, "sensor-channel");
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-	if (IS_ERR(gti->channel)) {
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-		ret = PTR_ERR(gti->channel);
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-		dev_err(&pdev->dev, "IIO channel not found: %d\n", ret);
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-		return ret;
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-	}
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-
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 	gti->tz_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, gti,
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 							   &gadc_thermal_ops);
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 	if (IS_ERR(gti->tz_dev)) {
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 		ret = PTR_ERR(gti->tz_dev);
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-		dev_err(&pdev->dev, "Thermal zone sensor register failed: %d\n",
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-			ret);
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+		if (ret != -EPROBE_DEFER)
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+			dev_err(&pdev->dev,
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+				"Thermal zone sensor register failed: %d\n",
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+				ret);
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 		return ret;
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 	}
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