2 * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
4 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5 * Philip Edelbrock <phil@netroedge.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/err.h>
30 #include <linux/mutex.h>
33 /* Addresses to scan */
34 static const unsigned short normal_i2c[] = {
35 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
38 adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
40 /* adm1021 constants specified below */
42 /* The adm1021 registers */
45 #define ADM1021_REG_TEMP(nr) (nr)
46 #define ADM1021_REG_STATUS 0x02
47 /* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
48 #define ADM1021_REG_MAN_ID 0xFE
49 /* ADM1021 = 0x0X, ADM1023 = 0x3X */
50 #define ADM1021_REG_DEV_ID 0xFF
51 /* These use different addresses for reading/writing */
52 #define ADM1021_REG_CONFIG_R 0x03
53 #define ADM1021_REG_CONFIG_W 0x09
54 #define ADM1021_REG_CONV_RATE_R 0x04
55 #define ADM1021_REG_CONV_RATE_W 0x0A
56 /* These are for the ADM1023's additional precision on the remote temp sensor */
57 #define ADM1023_REG_REM_TEMP_PREC 0x10
58 #define ADM1023_REG_REM_OFFSET 0x11
59 #define ADM1023_REG_REM_OFFSET_PREC 0x12
60 #define ADM1023_REG_REM_TOS_PREC 0x13
61 #define ADM1023_REG_REM_THYST_PREC 0x14
64 #define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
65 #define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
66 #define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
67 #define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
69 #define ADM1021_REG_ONESHOT 0x0F
74 * Note: Even though I left the low and high limits named os and hyst,
75 * they don't quite work like a thermostat the way the LM75 does. I.e.,
76 * a lower temp than THYST actually triggers an alarm instead of
77 * clearing it. Weird, ey? --Phil
80 /* Each client has this additional data */
82 struct device *hwmon_dev;
85 struct mutex update_lock;
86 char valid; /* !=0 if following fields are valid */
87 char low_power; /* !=0 if device in low power mode */
88 unsigned long last_updated; /* In jiffies */
90 int temp_max[2]; /* Register values */
94 /* Special values for ADM1023 only */
95 u8 remote_temp_offset;
96 u8 remote_temp_offset_prec;
99 static int adm1021_probe(struct i2c_client *client,
100 const struct i2c_device_id *id);
101 static int adm1021_detect(struct i2c_client *client,
102 struct i2c_board_info *info);
103 static void adm1021_init_client(struct i2c_client *client);
104 static int adm1021_remove(struct i2c_client *client);
105 static struct adm1021_data *adm1021_update_device(struct device *dev);
107 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
108 static bool read_only;
111 static const struct i2c_device_id adm1021_id[] = {
112 { "adm1021", adm1021 },
113 { "adm1023", adm1023 },
114 { "max1617", max1617 },
115 { "max1617a", max1617a },
116 { "thmc10", thmc10 },
118 { "gl523sm", gl523sm },
119 { "mc1066", mc1066 },
122 MODULE_DEVICE_TABLE(i2c, adm1021_id);
124 /* This is the driver that will be inserted */
125 static struct i2c_driver adm1021_driver = {
126 .class = I2C_CLASS_HWMON,
130 .probe = adm1021_probe,
131 .remove = adm1021_remove,
132 .id_table = adm1021_id,
133 .detect = adm1021_detect,
134 .address_list = normal_i2c,
137 static ssize_t show_temp(struct device *dev,
138 struct device_attribute *devattr, char *buf)
140 int index = to_sensor_dev_attr(devattr)->index;
141 struct adm1021_data *data = adm1021_update_device(dev);
143 return sprintf(buf, "%d\n", data->temp[index]);
146 static ssize_t show_temp_max(struct device *dev,
147 struct device_attribute *devattr, char *buf)
149 int index = to_sensor_dev_attr(devattr)->index;
150 struct adm1021_data *data = adm1021_update_device(dev);
152 return sprintf(buf, "%d\n", data->temp_max[index]);
155 static ssize_t show_temp_min(struct device *dev,
156 struct device_attribute *devattr, char *buf)
158 int index = to_sensor_dev_attr(devattr)->index;
159 struct adm1021_data *data = adm1021_update_device(dev);
161 return sprintf(buf, "%d\n", data->temp_min[index]);
164 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
167 int index = to_sensor_dev_attr(attr)->index;
168 struct adm1021_data *data = adm1021_update_device(dev);
169 return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
172 static ssize_t show_alarms(struct device *dev,
173 struct device_attribute *attr,
176 struct adm1021_data *data = adm1021_update_device(dev);
177 return sprintf(buf, "%u\n", data->alarms);
180 static ssize_t set_temp_max(struct device *dev,
181 struct device_attribute *devattr,
182 const char *buf, size_t count)
184 int index = to_sensor_dev_attr(devattr)->index;
185 struct i2c_client *client = to_i2c_client(dev);
186 struct adm1021_data *data = i2c_get_clientdata(client);
190 err = kstrtol(buf, 10, &temp);
195 mutex_lock(&data->update_lock);
196 data->temp_max[index] = clamp_val(temp, -128, 127);
198 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
199 data->temp_max[index]);
200 mutex_unlock(&data->update_lock);
205 static ssize_t set_temp_min(struct device *dev,
206 struct device_attribute *devattr,
207 const char *buf, size_t count)
209 int index = to_sensor_dev_attr(devattr)->index;
210 struct i2c_client *client = to_i2c_client(dev);
211 struct adm1021_data *data = i2c_get_clientdata(client);
215 err = kstrtol(buf, 10, &temp);
220 mutex_lock(&data->update_lock);
221 data->temp_min[index] = clamp_val(temp, -128, 127);
223 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
224 data->temp_min[index]);
225 mutex_unlock(&data->update_lock);
230 static ssize_t show_low_power(struct device *dev,
231 struct device_attribute *devattr, char *buf)
233 struct adm1021_data *data = adm1021_update_device(dev);
234 return sprintf(buf, "%d\n", data->low_power);
237 static ssize_t set_low_power(struct device *dev,
238 struct device_attribute *devattr,
239 const char *buf, size_t count)
241 struct i2c_client *client = to_i2c_client(dev);
242 struct adm1021_data *data = i2c_get_clientdata(client);
247 err = kstrtoul(buf, 10, &val);
250 low_power = val != 0;
252 mutex_lock(&data->update_lock);
253 if (low_power != data->low_power) {
254 int config = i2c_smbus_read_byte_data(
255 client, ADM1021_REG_CONFIG_R);
256 data->low_power = low_power;
257 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
258 (config & 0xBF) | (low_power << 6));
260 mutex_unlock(&data->update_lock);
266 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
267 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
269 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
271 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
272 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
274 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
276 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
277 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
278 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
279 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
280 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
282 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
283 static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power);
285 static struct attribute *adm1021_attributes[] = {
286 &sensor_dev_attr_temp1_max.dev_attr.attr,
287 &sensor_dev_attr_temp1_min.dev_attr.attr,
288 &sensor_dev_attr_temp1_input.dev_attr.attr,
289 &sensor_dev_attr_temp2_max.dev_attr.attr,
290 &sensor_dev_attr_temp2_min.dev_attr.attr,
291 &sensor_dev_attr_temp2_input.dev_attr.attr,
292 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
293 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
294 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
295 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
296 &sensor_dev_attr_temp2_fault.dev_attr.attr,
297 &dev_attr_alarms.attr,
298 &dev_attr_low_power.attr,
302 static const struct attribute_group adm1021_group = {
303 .attrs = adm1021_attributes,
306 /* Return 0 if detection is successful, -ENODEV otherwise */
307 static int adm1021_detect(struct i2c_client *client,
308 struct i2c_board_info *info)
310 struct i2c_adapter *adapter = client->adapter;
311 const char *type_name;
312 int conv_rate, status, config, man_id, dev_id;
314 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
315 pr_debug("detect failed, smbus byte data not supported!\n");
319 status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
320 conv_rate = i2c_smbus_read_byte_data(client,
321 ADM1021_REG_CONV_RATE_R);
322 config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
324 /* Check unused bits */
325 if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
326 pr_debug("detect failed, chip not detected!\n");
330 /* Determine the chip type. */
331 man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
332 dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
334 if (man_id < 0 || dev_id < 0)
337 if (man_id == 0x4d && dev_id == 0x01)
338 type_name = "max1617a";
339 else if (man_id == 0x41) {
340 if ((dev_id & 0xF0) == 0x30)
341 type_name = "adm1023";
342 else if ((dev_id & 0xF0) == 0x00)
343 type_name = "adm1021";
346 } else if (man_id == 0x49)
347 type_name = "thmc10";
348 else if (man_id == 0x23)
349 type_name = "gl523sm";
350 else if (man_id == 0x54)
351 type_name = "mc1066";
353 int lte, rte, lhi, rhi, llo, rlo;
355 /* extra checks for LM84 and MAX1617 to avoid misdetections */
357 llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
358 rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
360 /* fail if any of the additional register reads failed */
361 if (llo < 0 || rlo < 0)
364 lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
365 rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
366 lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
367 rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
370 * Fail for negative temperatures and negative high limits.
371 * This check also catches read errors on the tested registers.
373 if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
376 /* fail if all registers hold the same value */
377 if (lte == rte && lte == lhi && lte == rhi && lte == llo
382 * LM84 Mfr ID is in a different place,
383 * and it has more unused bits.
385 if (conv_rate == 0x00
386 && (config & 0x7F) == 0x00
387 && (status & 0xAB) == 0x00) {
390 /* fail if low limits are larger than high limits */
391 if ((s8)llo > lhi || (s8)rlo > rhi)
393 type_name = "max1617";
397 pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
398 type_name, i2c_adapter_id(adapter), client->addr);
399 strlcpy(info->type, type_name, I2C_NAME_SIZE);
404 static int adm1021_probe(struct i2c_client *client,
405 const struct i2c_device_id *id)
407 struct adm1021_data *data;
410 data = devm_kzalloc(&client->dev, sizeof(struct adm1021_data),
415 i2c_set_clientdata(client, data);
416 data->type = id->driver_data;
417 mutex_init(&data->update_lock);
419 /* Initialize the ADM1021 chip */
420 if (data->type != lm84 && !read_only)
421 adm1021_init_client(client);
423 /* Register sysfs hooks */
424 err = sysfs_create_group(&client->dev.kobj, &adm1021_group);
428 data->hwmon_dev = hwmon_device_register(&client->dev);
429 if (IS_ERR(data->hwmon_dev)) {
430 err = PTR_ERR(data->hwmon_dev);
437 sysfs_remove_group(&client->dev.kobj, &adm1021_group);
441 static void adm1021_init_client(struct i2c_client *client)
443 /* Enable ADC and disable suspend mode */
444 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
445 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
446 /* Set Conversion rate to 1/sec (this can be tinkered with) */
447 i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
450 static int adm1021_remove(struct i2c_client *client)
452 struct adm1021_data *data = i2c_get_clientdata(client);
454 hwmon_device_unregister(data->hwmon_dev);
455 sysfs_remove_group(&client->dev.kobj, &adm1021_group);
460 static struct adm1021_data *adm1021_update_device(struct device *dev)
462 struct i2c_client *client = to_i2c_client(dev);
463 struct adm1021_data *data = i2c_get_clientdata(client);
465 mutex_lock(&data->update_lock);
467 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
471 dev_dbg(&client->dev, "Starting adm1021 update\n");
473 for (i = 0; i < 2; i++) {
474 data->temp[i] = 1000 *
475 (s8) i2c_smbus_read_byte_data(
476 client, ADM1021_REG_TEMP(i));
477 data->temp_max[i] = 1000 *
478 (s8) i2c_smbus_read_byte_data(
479 client, ADM1021_REG_TOS_R(i));
480 data->temp_min[i] = 1000 *
481 (s8) i2c_smbus_read_byte_data(
482 client, ADM1021_REG_THYST_R(i));
484 data->alarms = i2c_smbus_read_byte_data(client,
485 ADM1021_REG_STATUS) & 0x7c;
486 if (data->type == adm1023) {
488 * The ADM1023 provides 3 extra bits of precision for
489 * the remote sensor in extra registers.
491 data->temp[1] += 125 * (i2c_smbus_read_byte_data(
492 client, ADM1023_REG_REM_TEMP_PREC) >> 5);
493 data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
494 client, ADM1023_REG_REM_TOS_PREC) >> 5);
495 data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
496 client, ADM1023_REG_REM_THYST_PREC) >> 5);
497 data->remote_temp_offset =
498 i2c_smbus_read_byte_data(client,
499 ADM1023_REG_REM_OFFSET);
500 data->remote_temp_offset_prec =
501 i2c_smbus_read_byte_data(client,
502 ADM1023_REG_REM_OFFSET_PREC);
504 data->last_updated = jiffies;
508 mutex_unlock(&data->update_lock);
513 module_i2c_driver(adm1021_driver);
515 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
516 "Philip Edelbrock <phil@netroedge.com>");
517 MODULE_DESCRIPTION("adm1021 driver");
518 MODULE_LICENSE("GPL");
520 module_param(read_only, bool, 0);
521 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");