1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  ds620.c - Support for temperature sensor and thermostat DS620
16 #include <linux/hwmon-sysfs.h>
52 #define DS620_COM_START		0x51	/* no data */
53 #define DS620_COM_STOP		0x22	/* no data */
62 	s16 temp[3];		/* Register values, word */  member
67 	struct ds620_platform_data *ds620_info = dev_get_platdata(&client->dev);  in ds620_init_client()
75 	/* already high at power-on, but don't trust the BIOS! */  in ds620_init_client()
78 	if (ds620_info && ds620_info->pomode == 1)  in ds620_init_client()
80 	else if (ds620_info && ds620_info->pomode == 2)  in ds620_init_client()
97 	struct i2c_client *client = data->client;  in ds620_update_client()
100 	mutex_lock(&data->update_lock);  in ds620_update_client()
102 	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)  in ds620_update_client()
103 	    || !data->valid) {  in ds620_update_client()
107 		dev_dbg(&client->dev, "Starting ds620 update\n");  in ds620_update_client()
109 		for (i = 0; i < ARRAY_SIZE(data->temp); i++) {  in ds620_update_client()
117 			data->temp[i] = res;  in ds620_update_client()
120 		data->last_updated = jiffies;  in ds620_update_client()
121 		data->valid = true;  in ds620_update_client()
124 	mutex_unlock(&data->update_lock);  in ds620_update_client()
138 	return sprintf(buf, "%d\n", ((data->temp[attr->index] / 8) * 625) / 10);  in temp_show()
149 	struct i2c_client *client = data->client;  in temp_store()
156 	val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8;  in temp_store()
158 	mutex_lock(&data->update_lock);  in temp_store()
159 	data->temp[attr->index] = val;  in temp_store()
160 	i2c_smbus_write_word_swapped(client, DS620_REG_TEMP[attr->index],  in temp_store()
161 				     data->temp[attr->index]);  in temp_store()
162 	mutex_unlock(&data->update_lock);  in temp_store()
178 	client = data->client;  in alarm_show()
186 	new_conf &= ~attr->index;  in alarm_show()
194 	return sprintf(buf, "%d\n", !!(conf & attr->index));  in alarm_show()
197 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
198 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 1);
199 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2);
216 	struct device *dev = &client->dev;  in ds620_probe()
222 		return -ENOMEM;  in ds620_probe()
224 	data->client = client;  in ds620_probe()
225 	mutex_init(&data->update_lock);  in ds620_probe()
230 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in ds620_probe()