1 // SPDX-License-Identifier: GPL-2.0-only
29 	if (!gti->lookup_table)  in gadc_thermal_adc_to_temp()
32 	for (i = 0; i < gti->nlookup_table; i++) {  in gadc_thermal_adc_to_temp()
33 		if (val >= gti->lookup_table[2 * i + 1])  in gadc_thermal_adc_to_temp()
38 		temp = gti->lookup_table[0];  in gadc_thermal_adc_to_temp()
39 	} else if (i >= gti->nlookup_table) {  in gadc_thermal_adc_to_temp()
40 		temp = gti->lookup_table[2 * (gti->nlookup_table - 1)];  in gadc_thermal_adc_to_temp()
42 		adc_hi = gti->lookup_table[2 * i - 1];  in gadc_thermal_adc_to_temp()
43 		adc_lo = gti->lookup_table[2 * i + 1];  in gadc_thermal_adc_to_temp()
45 		temp_hi = gti->lookup_table[2 * i - 2];  in gadc_thermal_adc_to_temp()
46 		temp_lo = gti->lookup_table[2 * i];  in gadc_thermal_adc_to_temp()
48 		temp = temp_hi + mult_frac(temp_lo - temp_hi, val - adc_hi,  in gadc_thermal_adc_to_temp()
49 					   adc_lo - adc_hi);  in gadc_thermal_adc_to_temp()
61 	ret = iio_read_channel_processed(gti->channel, &val);  in gadc_thermal_get_temp()
63 		dev_err(gti->dev, "IIO channel read failed %d\n", ret);  in gadc_thermal_get_temp()
78 	struct device_node *np = dev->of_node;  in gadc_thermal_read_linear_lookup_table()
83 	ntable = of_property_count_elems_of_size(np, "temperature-lookup-table",  in gadc_thermal_read_linear_lookup_table()
86 		ret = iio_get_channel_type(gti->channel, &chan_type);  in gadc_thermal_read_linear_lookup_table()
89 				   "no lookup table, assuming DAC channel returns milliCelcius\n");  in gadc_thermal_read_linear_lookup_table()
94 		dev_err(dev, "Pair of temperature vs ADC read value missing\n");  in gadc_thermal_read_linear_lookup_table()
95 		return -EINVAL;  in gadc_thermal_read_linear_lookup_table()
98 	gti->lookup_table = devm_kcalloc(dev,  in gadc_thermal_read_linear_lookup_table()
99 					 ntable, sizeof(*gti->lookup_table),  in gadc_thermal_read_linear_lookup_table()
101 	if (!gti->lookup_table)  in gadc_thermal_read_linear_lookup_table()
102 		return -ENOMEM;  in gadc_thermal_read_linear_lookup_table()
104 	ret = of_property_read_u32_array(np, "temperature-lookup-table",  in gadc_thermal_read_linear_lookup_table()
105 					 (u32 *)gti->lookup_table, ntable);  in gadc_thermal_read_linear_lookup_table()
107 		dev_err(dev, "Failed to read temperature lookup table: %d\n",  in gadc_thermal_read_linear_lookup_table()
112 	gti->nlookup_table = ntable / 2;  in gadc_thermal_read_linear_lookup_table()
122 	if (!pdev->dev.of_node) {  in gadc_thermal_probe()
123 		dev_err(&pdev->dev, "Only DT based supported\n");  in gadc_thermal_probe()
124 		return -ENODEV;  in gadc_thermal_probe()
127 	gti = devm_kzalloc(&pdev->dev, sizeof(*gti), GFP_KERNEL);  in gadc_thermal_probe()
129 		return -ENOMEM;  in gadc_thermal_probe()
131 	gti->channel = devm_iio_channel_get(&pdev->dev, "sensor-channel");  in gadc_thermal_probe()
132 	if (IS_ERR(gti->channel)) {  in gadc_thermal_probe()
133 		ret = PTR_ERR(gti->channel);  in gadc_thermal_probe()
134 		if (ret != -EPROBE_DEFER)  in gadc_thermal_probe()
135 			dev_err(&pdev->dev, "IIO channel not found: %d\n", ret);  in gadc_thermal_probe()
139 	ret = gadc_thermal_read_linear_lookup_table(&pdev->dev, gti);  in gadc_thermal_probe()
143 	gti->dev = &pdev->dev;  in gadc_thermal_probe()
146 	gti->tz_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, gti,  in gadc_thermal_probe()
148 	if (IS_ERR(gti->tz_dev)) {  in gadc_thermal_probe()
149 		ret = PTR_ERR(gti->tz_dev);  in gadc_thermal_probe()
150 		if (ret != -EPROBE_DEFER)  in gadc_thermal_probe()
151 			dev_err(&pdev->dev,  in gadc_thermal_probe()
161 	{ .compatible = "generic-adc-thermal", },
168 		.name = "generic-adc-thermal",