1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) ST-Ericsson 2010 - 2013
17 #include <linux/hwmon-sysfs.h>
19 #include <linux/mfd/abx500/ab8500-bm.h>
57  * VCC----[ R_up ]-----[ NTC ]----GND
58  * where R_up is pull-up resistance, and GPADC measures voltage on NTC.
59  * and res_to_temp table is strictly sorted by falling resistance values.
62 		int v_ntc, int *temp)  in ab8500_voltage_to_temp()  argument
64 	int r_ntc, i = 0, tbl_sz = cfg->tbl_sz;  in ab8500_voltage_to_temp()
65 	const struct abx500_res_to_temp *tbl = cfg->temp_tbl;  in ab8500_voltage_to_temp()
67 	if (cfg->vcc < 0 || v_ntc >= cfg->vcc)  in ab8500_voltage_to_temp()
68 		return -EINVAL;  in ab8500_voltage_to_temp()
70 	r_ntc = v_ntc * cfg->r_up / (cfg->vcc - v_ntc);  in ab8500_voltage_to_temp()
71 	if (r_ntc > tbl[0].resist || r_ntc < tbl[tbl_sz - 1].resist)  in ab8500_voltage_to_temp()
72 		return -EINVAL;  in ab8500_voltage_to_temp()
75 			i < tbl_sz - 2)  in ab8500_voltage_to_temp()
78 	/* return milli-Celsius */  in ab8500_voltage_to_temp()
79 	*temp = tbl[i].temp * 1000 + ((tbl[i + 1].temp - tbl[i].temp) * 1000 *  in ab8500_voltage_to_temp()
80 		(r_ntc - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);  in ab8500_voltage_to_temp()
85 static int ab8500_read_sensor(struct abx500_temp *data, u8 sensor, int *temp)  in ab8500_read_sensor()  argument
88 	struct ab8500_temp *ab8500_data = data->plat_data;  in ab8500_read_sensor()
91 		*temp = ab8500_btemp_get_temp(ab8500_data->btemp);  in ab8500_read_sensor()
93 		*temp = ab8500_btemp_get_batctrl_temp(ab8500_data->btemp);  in ab8500_read_sensor()
95 		ret = iio_read_channel_processed(ab8500_data->aux1, &voltage);  in ab8500_read_sensor()
98 		ret = ab8500_voltage_to_temp(&ab8500_data->cfg, voltage, temp);  in ab8500_read_sensor()
102 		ret = iio_read_channel_processed(ab8500_data->aux2, &voltage);  in ab8500_read_sensor()
105 		ret = ab8500_voltage_to_temp(&ab8500_data->cfg, voltage, temp);  in ab8500_read_sensor()
117 	struct abx500_temp *abx500_data = ab8500_data->abx500_data;  in ab8500_thermal_power_off()
119 	dev_warn(&abx500_data->pdev->dev, "Power off due to critical temp\n");  in ab8500_thermal_power_off()
135 	int index = attr->index;  in ab8500_show_label()
151 		return -EINVAL;  in ab8500_show_label()
159 	struct ab8500_temp *ab8500_data = data->plat_data;  in ab8500_temp_irq_handler()
161 	dev_warn(&data->pdev->dev, "Power off in %d s\n",  in ab8500_temp_irq_handler()
164 	schedule_delayed_work(&ab8500_data->power_off_work,  in ab8500_temp_irq_handler()
173 	ab8500_data = devm_kzalloc(&data->pdev->dev, sizeof(*ab8500_data),  in abx500_hwmon_init()
176 		return -ENOMEM;  in abx500_hwmon_init()
178 	ab8500_data->btemp = ab8500_btemp_get();  in abx500_hwmon_init()
179 	if (IS_ERR(ab8500_data->btemp))  in abx500_hwmon_init()
180 		return PTR_ERR(ab8500_data->btemp);  in abx500_hwmon_init()
182 	INIT_DELAYED_WORK(&ab8500_data->power_off_work,  in abx500_hwmon_init()
185 	ab8500_data->cfg.vcc = THERMAL_VCC;  in abx500_hwmon_init()
186 	ab8500_data->cfg.r_up = PULL_UP_RESISTOR;  in abx500_hwmon_init()
187 	ab8500_data->cfg.temp_tbl = ab8500_temp_tbl_a_thermistor;  in abx500_hwmon_init()
188 	ab8500_data->cfg.tbl_sz = ab8500_temp_tbl_a_size;  in abx500_hwmon_init()
190 	data->plat_data = ab8500_data;  in abx500_hwmon_init()
191 	ab8500_data->aux1 = devm_iio_channel_get(&data->pdev->dev, "aux1");  in abx500_hwmon_init()
192 	if (IS_ERR(ab8500_data->aux1)) {  in abx500_hwmon_init()
193 		if (PTR_ERR(ab8500_data->aux1) == -ENODEV)  in abx500_hwmon_init()
194 			return -EPROBE_DEFER;  in abx500_hwmon_init()
195 		dev_err(&data->pdev->dev, "failed to get AUX1 ADC channel\n");  in abx500_hwmon_init()
196 		return PTR_ERR(ab8500_data->aux1);  in abx500_hwmon_init()
198 	ab8500_data->aux2 = devm_iio_channel_get(&data->pdev->dev, "aux2");  in abx500_hwmon_init()
199 	if (IS_ERR(ab8500_data->aux2)) {  in abx500_hwmon_init()
200 		if (PTR_ERR(ab8500_data->aux2) == -ENODEV)  in abx500_hwmon_init()
201 			return -EPROBE_DEFER;  in abx500_hwmon_init()
202 		dev_err(&data->pdev->dev, "failed to get AUX2 ADC channel\n");  in abx500_hwmon_init()
203 		return PTR_ERR(ab8500_data->aux2);  in abx500_hwmon_init()
206 	data->gpadc_addr[0] = AB8500_SENSOR_AUX1;  in abx500_hwmon_init()
207 	data->gpadc_addr[1] = AB8500_SENSOR_AUX2;  in abx500_hwmon_init()
208 	data->gpadc_addr[2] = AB8500_SENSOR_BTEMP_BALL;  in abx500_hwmon_init()
209 	data->gpadc_addr[3] = AB8500_SENSOR_BAT_CTRL;  in abx500_hwmon_init()
210 	data->monitored_sensors = NUM_MONITORED_SENSORS;  in abx500_hwmon_init()
212 	data->ops.read_sensor = ab8500_read_sensor;  in abx500_hwmon_init()
213 	data->ops.irq_handler = ab8500_temp_irq_handler;  in abx500_hwmon_init()
214 	data->ops.show_name = ab8500_show_name;  in abx500_hwmon_init()
215 	data->ops.show_label = ab8500_show_label;  in abx500_hwmon_init()
216 	data->ops.is_visible = NULL;  in abx500_hwmon_init()