1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
5 * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
6 * Jean Delvare <jdelvare@suse.de>
8 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
9 * It reports up to two temperatures (its own plus up to
10 * one external one). Complete datasheet can be
11 * obtained from Maxim's website at:
12 * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
15 #include <linux/err.h>
16 #include <linux/hwmon.h>
17 #include <linux/i2c.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/regmap.h>
21 #include <linux/util_macros.h>
23 static const unsigned short normal_i2c[] = {
24 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
26 #define MAX1619_REG_LOCAL_TEMP 0x00
27 #define MAX1619_REG_REMOTE_TEMP 0x01
28 #define MAX1619_REG_STATUS 0x02
29 #define MAX1619_REG_CONFIG 0x03
30 #define MAX1619_REG_CONVRATE 0x04
31 #define MAX1619_REG_REMOTE_HIGH 0x07
32 #define MAX1619_REG_REMOTE_LOW 0x08
33 #define MAX1619_REG_REMOTE_CRIT 0x10
34 #define MAX1619_REG_REMOTE_CRIT_HYST 0x11
35 #define MAX1619_REG_MAN_ID 0xFE
36 #define MAX1619_REG_CHIP_ID 0xFF
38 static int get_alarms(struct regmap *regmap)
40 static u32 regs[2] = { MAX1619_REG_STATUS, MAX1619_REG_CONFIG };
44 ret = regmap_multi_reg_read(regmap, regs, regdata, 2);
48 /* OVERT status bit may be reversed */
49 if (!(regdata[1] & 0x20))
52 return regdata[0] & 0x1e;
55 static int max1619_temp_read(struct regmap *regmap, u32 attr, int channel, long *val)
57 int reg = -1, alarm_bit = 0;
62 case hwmon_temp_input:
63 reg = channel ? MAX1619_REG_REMOTE_TEMP : MAX1619_REG_LOCAL_TEMP;
66 reg = MAX1619_REG_REMOTE_LOW;
69 reg = MAX1619_REG_REMOTE_HIGH;
72 reg = MAX1619_REG_REMOTE_CRIT;
74 case hwmon_temp_crit_hyst:
75 reg = MAX1619_REG_REMOTE_CRIT_HYST;
77 case hwmon_temp_min_alarm:
80 case hwmon_temp_max_alarm:
83 case hwmon_temp_crit_alarm:
86 case hwmon_temp_fault:
93 ret = regmap_read(regmap, reg, &temp);
96 *val = sign_extend32(temp, 7) * 1000;
98 ret = get_alarms(regmap);
101 *val = !!(ret & BIT(alarm_bit));
106 static u16 update_intervals[] = { 16000, 8000, 4000, 2000, 1000, 500, 250, 125 };
108 static int max1619_chip_read(struct regmap *regmap, u32 attr, long *val)
114 case hwmon_chip_update_interval:
115 ret = regmap_read(regmap, MAX1619_REG_CONVRATE, ®val);
118 *val = update_intervals[regval & 7];
120 case hwmon_chip_alarms:
121 alarms = get_alarms(regmap);
132 static int max1619_read(struct device *dev, enum hwmon_sensor_types type,
133 u32 attr, int channel, long *val)
135 struct regmap *regmap = dev_get_drvdata(dev);
139 return max1619_chip_read(regmap, attr, val);
141 return max1619_temp_read(regmap, attr, channel, val);
147 static int max1619_chip_write(struct regmap *regmap, u32 attr, long val)
150 case hwmon_chip_update_interval:
151 val = find_closest_descending(val, update_intervals, ARRAY_SIZE(update_intervals));
152 return regmap_write(regmap, MAX1619_REG_CONVRATE, val);
158 static int max1619_temp_write(struct regmap *regmap,
159 u32 attr, int channel, long val)
165 reg = MAX1619_REG_REMOTE_LOW;
168 reg = MAX1619_REG_REMOTE_HIGH;
170 case hwmon_temp_crit:
171 reg = MAX1619_REG_REMOTE_CRIT;
173 case hwmon_temp_crit_hyst:
174 reg = MAX1619_REG_REMOTE_CRIT_HYST;
179 val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
180 return regmap_write(regmap, reg, val);
183 static int max1619_write(struct device *dev, enum hwmon_sensor_types type,
184 u32 attr, int channel, long val)
186 struct regmap *regmap = dev_get_drvdata(dev);
190 return max1619_chip_write(regmap, attr, val);
192 return max1619_temp_write(regmap, attr, channel, val);
198 static umode_t max1619_is_visible(const void *_data, enum hwmon_sensor_types type,
199 u32 attr, int channel)
204 case hwmon_chip_update_interval:
206 case hwmon_chip_alarms:
214 case hwmon_temp_input:
218 case hwmon_temp_crit:
219 case hwmon_temp_crit_hyst:
221 case hwmon_temp_min_alarm:
222 case hwmon_temp_max_alarm:
223 case hwmon_temp_crit_alarm:
224 case hwmon_temp_fault:
236 static const struct hwmon_channel_info * const max1619_info[] = {
237 HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS | HWMON_C_UPDATE_INTERVAL),
238 HWMON_CHANNEL_INFO(temp,
240 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
241 HWMON_T_CRIT | HWMON_T_CRIT_HYST |
242 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
243 HWMON_T_CRIT_ALARM | HWMON_T_FAULT),
247 static const struct hwmon_ops max1619_hwmon_ops = {
248 .is_visible = max1619_is_visible,
249 .read = max1619_read,
250 .write = max1619_write,
253 static const struct hwmon_chip_info max1619_chip_info = {
254 .ops = &max1619_hwmon_ops,
255 .info = max1619_info,
258 /* Return 0 if detection is successful, -ENODEV otherwise */
259 static int max1619_detect(struct i2c_client *client,
260 struct i2c_board_info *info)
262 struct i2c_adapter *adapter = client->adapter;
265 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
268 regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONFIG);
269 if (regval < 0 || (regval & 0x03))
271 regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE);
272 if (regval < 0 || regval > 0x07)
274 regval = i2c_smbus_read_byte_data(client, MAX1619_REG_STATUS);
275 if (regval < 0 || (regval & 0x61))
278 regval = i2c_smbus_read_byte_data(client, MAX1619_REG_MAN_ID);
281 regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CHIP_ID);
285 strscpy(info->type, "max1619", I2C_NAME_SIZE);
290 static int max1619_init_chip(struct regmap *regmap)
294 ret = regmap_write(regmap, MAX1619_REG_CONVRATE, 5); /* 2 Hz */
298 /* Start conversions */
299 return regmap_clear_bits(regmap, MAX1619_REG_CONFIG, 0x40);
304 static int max1619_reg_read(void *context, unsigned int reg, unsigned int *val)
308 ret = i2c_smbus_read_byte_data(context, reg);
316 static int max1619_reg_write(void *context, unsigned int reg, unsigned int val)
318 int offset = reg < MAX1619_REG_REMOTE_CRIT ? 6 : 2;
320 return i2c_smbus_write_byte_data(context, reg + offset, val);
323 static bool max1619_regmap_is_volatile(struct device *dev, unsigned int reg)
325 return reg <= MAX1619_REG_STATUS;
328 static bool max1619_regmap_is_writeable(struct device *dev, unsigned int reg)
330 return reg > MAX1619_REG_STATUS && reg <= MAX1619_REG_REMOTE_CRIT_HYST;
333 static const struct regmap_config max1619_regmap_config = {
336 .max_register = MAX1619_REG_REMOTE_CRIT_HYST,
337 .cache_type = REGCACHE_MAPLE,
338 .volatile_reg = max1619_regmap_is_volatile,
339 .writeable_reg = max1619_regmap_is_writeable,
342 static const struct regmap_bus max1619_regmap_bus = {
343 .reg_write = max1619_reg_write,
344 .reg_read = max1619_reg_read,
347 static int max1619_probe(struct i2c_client *client)
349 struct device *dev = &client->dev;
350 struct device *hwmon_dev;
351 struct regmap *regmap;
354 regmap = devm_regmap_init(dev, &max1619_regmap_bus, client,
355 &max1619_regmap_config);
357 return PTR_ERR(regmap);
359 ret = max1619_init_chip(regmap);
363 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
364 regmap, &max1619_chip_info, NULL);
365 return PTR_ERR_OR_ZERO(hwmon_dev);
368 static const struct i2c_device_id max1619_id[] = {
372 MODULE_DEVICE_TABLE(i2c, max1619_id);
375 static const struct of_device_id max1619_of_match[] = {
376 { .compatible = "maxim,max1619", },
380 MODULE_DEVICE_TABLE(of, max1619_of_match);
383 static struct i2c_driver max1619_driver = {
384 .class = I2C_CLASS_HWMON,
387 .of_match_table = of_match_ptr(max1619_of_match),
389 .probe = max1619_probe,
390 .id_table = max1619_id,
391 .detect = max1619_detect,
392 .address_list = normal_i2c,
395 module_i2c_driver(max1619_driver);
397 MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
398 MODULE_DESCRIPTION("MAX1619 sensor driver");
399 MODULE_LICENSE("GPL");