1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * ST Thermal Sensor Driver core routines
6  * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
17 #define mcelsius(temp)			((temp) * 1000)  argument
23 static int st_thermal_alloc_regfields(struct st_thermal_sensor *sensor)  in st_thermal_alloc_regfields()  argument
25 	struct device *dev = sensor->dev;  in st_thermal_alloc_regfields()
26 	struct regmap *regmap = sensor->regmap;  in st_thermal_alloc_regfields()
27 	const struct reg_field *reg_fields = sensor->cdata->reg_fields;  in st_thermal_alloc_regfields()
29 	sensor->dcorrect = devm_regmap_field_alloc(dev, regmap,  in st_thermal_alloc_regfields()
32 	sensor->overflow = devm_regmap_field_alloc(dev, regmap,  in st_thermal_alloc_regfields()
35 	sensor->temp_data = devm_regmap_field_alloc(dev, regmap,  in st_thermal_alloc_regfields()
38 	if (IS_ERR(sensor->dcorrect) ||  in st_thermal_alloc_regfields()
39 	    IS_ERR(sensor->overflow) ||  in st_thermal_alloc_regfields()
40 	    IS_ERR(sensor->temp_data)) {  in st_thermal_alloc_regfields()
42 		return -EINVAL;  in st_thermal_alloc_regfields()
45 	return sensor->ops->alloc_regfields(sensor);  in st_thermal_alloc_regfields()
48 static int st_thermal_sensor_on(struct st_thermal_sensor *sensor)  in st_thermal_sensor_on()  argument
51 	struct device *dev = sensor->dev;  in st_thermal_sensor_on()
53 	ret = clk_prepare_enable(sensor->clk);  in st_thermal_sensor_on()
59 	ret = sensor->ops->power_ctrl(sensor, POWER_ON);  in st_thermal_sensor_on()
61 		dev_err(dev, "failed to power on sensor\n");  in st_thermal_sensor_on()
62 		clk_disable_unprepare(sensor->clk);  in st_thermal_sensor_on()
68 static int st_thermal_sensor_off(struct st_thermal_sensor *sensor)  in st_thermal_sensor_off()  argument
72 	ret = sensor->ops->power_ctrl(sensor, POWER_OFF);  in st_thermal_sensor_off()
76 	clk_disable_unprepare(sensor->clk);  in st_thermal_sensor_off()
81 static int st_thermal_calibration(struct st_thermal_sensor *sensor)  in st_thermal_calibration()  argument
85 	struct device *dev = sensor->dev;  in st_thermal_calibration()
87 	/* Check if sensor calibration data is already written */  in st_thermal_calibration()
88 	ret = regmap_field_read(sensor->dcorrect, &val);  in st_thermal_calibration()
96 		 * Sensor calibration value not set by bootloader,  in st_thermal_calibration()
99 		ret = regmap_field_write(sensor->dcorrect,  in st_thermal_calibration()
100 					 sensor->cdata->calibration_val);  in st_thermal_calibration()
111 	struct st_thermal_sensor *sensor = thermal_zone_device_priv(th);  in st_thermal_get_temp()  local
112 	unsigned int temp;  in st_thermal_get_temp()  local
116 	ret = regmap_field_read(sensor->overflow, &overflow);  in st_thermal_get_temp()
120 		return -EIO;  in st_thermal_get_temp()
122 	ret = regmap_field_read(sensor->temp_data, &temp);  in st_thermal_get_temp()
126 	temp += sensor->cdata->temp_adjust_val;  in st_thermal_get_temp()
127 	temp = mcelsius(temp);  in st_thermal_get_temp()
129 	*temperature = temp;  in st_thermal_get_temp()
143 	struct st_thermal_sensor *sensor;  in st_thermal_register()  local
144 	struct device *dev = &pdev->dev;  in st_thermal_register()
145 	struct device_node *np = dev->of_node;  in st_thermal_register()
153 		return -EINVAL;  in st_thermal_register()
156 	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);  in st_thermal_register()
157 	if (!sensor)  in st_thermal_register()
158 		return -ENOMEM;  in st_thermal_register()
160 	sensor->dev = dev;  in st_thermal_register()
163 	if (!(match && match->data))  in st_thermal_register()
164 		return -EINVAL;  in st_thermal_register()
166 	sensor->cdata = match->data;  in st_thermal_register()
167 	if (!sensor->cdata->ops)  in st_thermal_register()
168 		return -EINVAL;  in st_thermal_register()
170 	sensor->ops = sensor->cdata->ops;  in st_thermal_register()
172 	ret = (sensor->ops->regmap_init)(sensor);  in st_thermal_register()
176 	ret = st_thermal_alloc_regfields(sensor);  in st_thermal_register()
180 	sensor->clk = devm_clk_get(dev, "thermal");  in st_thermal_register()
181 	if (IS_ERR(sensor->clk)) {  in st_thermal_register()
183 		return PTR_ERR(sensor->clk);  in st_thermal_register()
186 	if (sensor->ops->register_enable_irq) {  in st_thermal_register()
187 		ret = sensor->ops->register_enable_irq(sensor);  in st_thermal_register()
192 	ret = st_thermal_sensor_on(sensor);  in st_thermal_register()
196 	ret = st_thermal_calibration(sensor);  in st_thermal_register()
200 	polling_delay = sensor->ops->register_enable_irq ? 0 : 1000;  in st_thermal_register()
202 	trip.temperature = sensor->cdata->crit_temp;  in st_thermal_register()
205 	sensor->thermal_dev =  in st_thermal_register()
206 		thermal_zone_device_register_with_trips(dev_name(dev), &trip, 1, 0, sensor,  in st_thermal_register()
208 	if (IS_ERR(sensor->thermal_dev)) {  in st_thermal_register()
210 		ret = PTR_ERR(sensor->thermal_dev);  in st_thermal_register()
213 	ret = thermal_zone_device_enable(sensor->thermal_dev);  in st_thermal_register()
217 	platform_set_drvdata(pdev, sensor);  in st_thermal_register()
222 	thermal_zone_device_unregister(sensor->thermal_dev);  in st_thermal_register()
224 	st_thermal_sensor_off(sensor);  in st_thermal_register()
232 	struct st_thermal_sensor *sensor = platform_get_drvdata(pdev);  in st_thermal_unregister()  local
234 	st_thermal_sensor_off(sensor);  in st_thermal_unregister()
235 	thermal_zone_device_unregister(sensor->thermal_dev);  in st_thermal_unregister()
242 	struct st_thermal_sensor *sensor = dev_get_drvdata(dev);  in st_thermal_suspend()  local
244 	return st_thermal_sensor_off(sensor);  in st_thermal_suspend()
250 	struct st_thermal_sensor *sensor = dev_get_drvdata(dev);  in st_thermal_resume()  local
252 	ret = st_thermal_sensor_on(sensor);  in st_thermal_resume()
256 	ret = st_thermal_calibration(sensor);  in st_thermal_resume()
260 	if (sensor->ops->enable_irq) {  in st_thermal_resume()
261 		ret = sensor->ops->enable_irq(sensor);  in st_thermal_resume()
274 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");