1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
5  * Christian W. Zuckschwerdt  <zany@triq.net>  2000-11-23
10  * The DS1621 device is a digital temperature/thermometer with 9-bit
11  * resolution, a thermal alarm output (Tout), and user-defined minimum
30 #include <linux/hwmon-sysfs.h>
40 static int polarity = -1;
47  * - DS1621:
49  * |Done|THF |TLF |NVB | X  | X  |POL |1SHOT|
51  * - DS1625:
53  * |Done|THF |TLF |NVB | 1  | 0  |POL |1SHOT|
55  * - DS1631, DS1731:
57  * |Done|THF |TLF |NVB | R1 | R0 |POL |1SHOT|
59  * - DS1721:
61  * |Done| X  | X  | U  | R1 | R0 |POL |1SHOT|
64  * - 'X' is Reserved
65  * - 'U' is Undefined
77 	94,	/*  9-bits (0.5,  93.75, RES[0..1] = 0 */
78 	188,	/* 10-bits (0.25, 187.5, RES[0..1] = 1 */
79 	375,	/* 11-bits (0.125,  375, RES[0..1] = 2 */
80 	750,	/* 12-bits (0.0625, 750, RES[0..1] = 3 */
87 #define DS1621_TEMP_MIN	(-55000)
129  * TEMP: 0.001C/bit (-55C to +125C)
131  *  - 1621, 1625: 0.5C/bit, 7 zero-bits
132  *  - 1631, 1721, 1731: 0.0625C/bit, 4 zero-bits
137 	temp = DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;  in DS1621_TEMP_TO_REG()
159 	switch (data->kind) {  in ds1621_init_client()
161 		data->update_interval = DS1625_CONVERSION_MAX;  in ds1621_init_client()
162 		data->zbits = 7;  in ds1621_init_client()
170 		data->update_interval = ds1721_convrates[resol];  in ds1621_init_client()
171 		data->zbits = 7 - resol;  in ds1621_init_client()
175 		data->update_interval = DS1621_CONVERSION_MAX;  in ds1621_init_client()
176 		data->zbits = 7;  in ds1621_init_client()
188 	struct i2c_client *client = data->client;  in ds1621_update_client()
191 	mutex_lock(&data->update_lock);  in ds1621_update_client()
193 	if (time_after(jiffies, data->last_updated + data->update_interval) ||  in ds1621_update_client()
194 	    !data->valid) {  in ds1621_update_client()
197 		dev_dbg(&client->dev, "Starting ds1621 update\n");  in ds1621_update_client()
199 		data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);  in ds1621_update_client()
201 		for (i = 0; i < ARRAY_SIZE(data->temp); i++)  in ds1621_update_client()
202 			data->temp[i] = i2c_smbus_read_word_swapped(client,  in ds1621_update_client()
206 		new_conf = data->conf;  in ds1621_update_client()
207 		if (data->temp[0] > data->temp[1])	/* input > min */  in ds1621_update_client()
209 		if (data->temp[0] < data->temp[2])	/* input < max */  in ds1621_update_client()
211 		if (data->conf != new_conf)  in ds1621_update_client()
215 		data->last_updated = jiffies;  in ds1621_update_client()
216 		data->valid = true;  in ds1621_update_client()
219 	mutex_unlock(&data->update_lock);  in ds1621_update_client()
230 		       DS1621_TEMP_FROM_REG(data->temp[attr->index]));  in temp_show()
245 	mutex_lock(&data->update_lock);  in temp_store()
246 	data->temp[attr->index] = DS1621_TEMP_TO_REG(val, data->zbits);  in temp_store()
247 	i2c_smbus_write_word_swapped(data->client, DS1621_REG_TEMP[attr->index],  in temp_store()
248 				     data->temp[attr->index]);  in temp_store()
249 	mutex_unlock(&data->update_lock);  in temp_store()
257 	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));  in alarms_show()
265 	return sprintf(buf, "%d\n", !!(data->conf & attr->index));  in alarm_show()
272 	return sysfs_emit(buf, "%hu\n", data->update_interval);  in update_interval_show()
280 	struct i2c_client *client = data->client;  in update_interval_store()
290 	while (resol < (ARRAY_SIZE(ds1721_convrates) - 1) &&  in update_interval_store()
294 	mutex_lock(&data->update_lock);  in update_interval_store()
295 	data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);  in update_interval_store()
296 	data->conf &= ~DS1621_REG_CONFIG_RESOL;  in update_interval_store()
297 	data->conf |= (resol << DS1621_REG_CONFIG_RESOL_SHIFT);  in update_interval_store()
298 	i2c_smbus_write_byte_data(client, DS1621_REG_CONF, data->conf);  in update_interval_store()
299 	data->update_interval = ds1721_convrates[resol];  in update_interval_store()
300 	data->zbits = 7 - resol;  in update_interval_store()
301 	mutex_unlock(&data->update_lock);  in update_interval_store()
312 static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, DS1621_ALARM_TEMP_LOW);
313 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, DS1621_ALARM_TEMP_HIGH);
333 		if (data->kind == ds1621 || data->kind == ds1625)  in ds1621_attribute_visible()
336 	return attr->mode;  in ds1621_attribute_visible()
350 	data = devm_kzalloc(&client->dev, sizeof(struct ds1621_data),  in ds1621_probe()
353 		return -ENOMEM;  in ds1621_probe()
355 	mutex_init(&data->update_lock);  in ds1621_probe()
357 	data->kind = (uintptr_t)i2c_get_match_data(client);  in ds1621_probe()
358 	data->client = client;  in ds1621_probe()
363 	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,  in ds1621_probe()
364 							   client->name, data,  in ds1621_probe()