2 * lm63.c - driver for the National Semiconductor LM63 temperature sensor
3 * with integrated fan control
4 * Copyright (C) 2004-2005 Jean Delvare <khali@linux-fr.org>
5 * Based on the lm90 driver.
7 * The LM63 is a sensor chip made by National Semiconductor. It measures
8 * two temperatures (its own and one external one) and the speed of one
9 * fan, those speed it can additionally control. Complete datasheet can be
10 * obtained from National's website at:
11 * http://www.national.com/pf/LM/LM63.html
13 * The LM63 is basically an LM86 with fan speed monitoring and control
14 * capabilities added. It misses some of the LM86 features though:
15 * - No low limit for local temperature.
16 * - No critical limit for local temperature.
17 * - Critical limit for remote temperature can be changed only once. We
18 * will consider that the critical limit is read-only.
20 * The datasheet isn't very clear about what the tachometer reading is.
21 * I had a explanation from National Semiconductor though. The two lower
22 * bits of the read value have to be masked out. The value is still 16 bit
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation; either version 2 of the License, or
28 * (at your option) any later version.
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
35 * You should have received a copy of the GNU General Public License
36 * along with this program; if not, write to the Free Software
37 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/jiffies.h>
44 #include <linux/i2c.h>
45 #include <linux/hwmon-sysfs.h>
46 #include <linux/hwmon.h>
47 #include <linux/err.h>
51 * Address is fully defined internally and cannot be changed.
54 static unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
60 I2C_CLIENT_INSMOD_1(lm63);
66 #define LM63_REG_CONFIG1 0x03
67 #define LM63_REG_CONFIG2 0xBF
68 #define LM63_REG_CONFIG_FAN 0x4A
70 #define LM63_REG_TACH_COUNT_MSB 0x47
71 #define LM63_REG_TACH_COUNT_LSB 0x46
72 #define LM63_REG_TACH_LIMIT_MSB 0x49
73 #define LM63_REG_TACH_LIMIT_LSB 0x48
75 #define LM63_REG_PWM_VALUE 0x4C
76 #define LM63_REG_PWM_FREQ 0x4D
78 #define LM63_REG_LOCAL_TEMP 0x00
79 #define LM63_REG_LOCAL_HIGH 0x05
81 #define LM63_REG_REMOTE_TEMP_MSB 0x01
82 #define LM63_REG_REMOTE_TEMP_LSB 0x10
83 #define LM63_REG_REMOTE_OFFSET_MSB 0x11
84 #define LM63_REG_REMOTE_OFFSET_LSB 0x12
85 #define LM63_REG_REMOTE_HIGH_MSB 0x07
86 #define LM63_REG_REMOTE_HIGH_LSB 0x13
87 #define LM63_REG_REMOTE_LOW_MSB 0x08
88 #define LM63_REG_REMOTE_LOW_LSB 0x14
89 #define LM63_REG_REMOTE_TCRIT 0x19
90 #define LM63_REG_REMOTE_TCRIT_HYST 0x21
92 #define LM63_REG_ALERT_STATUS 0x02
93 #define LM63_REG_ALERT_MASK 0x16
95 #define LM63_REG_MAN_ID 0xFE
96 #define LM63_REG_CHIP_ID 0xFF
99 * Conversions and various macros
100 * For tachometer counts, the LM63 uses 16-bit values.
101 * For local temperature and high limit, remote critical limit and hysteresis
102 * value, it uses signed 8-bit values with LSB = 1 degree Celsius.
103 * For remote temperature, low and high limits, it uses signed 11-bit values
104 * with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
107 #define FAN_FROM_REG(reg) ((reg) == 0xFFFC || (reg) == 0 ? 0 : \
109 #define FAN_TO_REG(val) ((val) <= 82 ? 0xFFFC : \
110 (5400000 / (val)) & 0xFFFC)
111 #define TEMP8_FROM_REG(reg) ((reg) * 1000)
112 #define TEMP8_TO_REG(val) ((val) <= -128000 ? -128 : \
113 (val) >= 127000 ? 127 : \
114 (val) < 0 ? ((val) - 500) / 1000 : \
115 ((val) + 500) / 1000)
116 #define TEMP11_FROM_REG(reg) ((reg) / 32 * 125)
117 #define TEMP11_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
118 (val) >= 127875 ? 0x7FE0 : \
119 (val) < 0 ? ((val) - 62) / 125 * 32 : \
120 ((val) + 62) / 125 * 32)
121 #define HYST_TO_REG(val) ((val) <= 0 ? 0 : \
122 (val) >= 127000 ? 127 : \
123 ((val) + 500) / 1000)
126 * Functions declaration
129 static int lm63_attach_adapter(struct i2c_adapter *adapter);
130 static int lm63_detach_client(struct i2c_client *client);
132 static struct lm63_data *lm63_update_device(struct device *dev);
134 static int lm63_detect(struct i2c_adapter *adapter, int address, int kind);
135 static void lm63_init_client(struct i2c_client *client);
138 * Driver data (common to all clients)
141 static struct i2c_driver lm63_driver = {
142 .owner = THIS_MODULE,
144 .flags = I2C_DF_NOTIFY,
145 .attach_adapter = lm63_attach_adapter,
146 .detach_client = lm63_detach_client,
150 * Client data (each client gets its own)
154 struct i2c_client client;
155 struct class_device *class_dev;
156 struct semaphore update_lock;
157 char valid; /* zero until following fields are valid */
158 unsigned long last_updated; /* in jiffies */
160 /* registers values */
161 u8 config, config_fan;
162 u16 fan[2]; /* 0: input
166 s8 temp8[3]; /* 0: local input
168 2: remote critical limit */
169 s16 temp11[3]; /* 0: remote input
171 2: remote high limit */
177 * Sysfs callback functions and files
180 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
183 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
184 struct lm63_data *data = lm63_update_device(dev);
185 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index]));
188 static ssize_t set_fan(struct device *dev, struct device_attribute *dummy,
189 const char *buf, size_t count)
191 struct i2c_client *client = to_i2c_client(dev);
192 struct lm63_data *data = i2c_get_clientdata(client);
193 unsigned long val = simple_strtoul(buf, NULL, 10);
195 down(&data->update_lock);
196 data->fan[1] = FAN_TO_REG(val);
197 i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_LSB,
198 data->fan[1] & 0xFF);
199 i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_MSB,
201 up(&data->update_lock);
205 static ssize_t show_pwm1(struct device *dev, struct device_attribute *dummy,
208 struct lm63_data *data = lm63_update_device(dev);
209 return sprintf(buf, "%d\n", data->pwm1_value >= 2 * data->pwm1_freq ?
210 255 : (data->pwm1_value * 255 + data->pwm1_freq) /
211 (2 * data->pwm1_freq));
214 static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy,
215 const char *buf, size_t count)
217 struct i2c_client *client = to_i2c_client(dev);
218 struct lm63_data *data = i2c_get_clientdata(client);
221 if (!(data->config_fan & 0x20)) /* register is read-only */
224 val = simple_strtoul(buf, NULL, 10);
225 down(&data->update_lock);
226 data->pwm1_value = val <= 0 ? 0 :
227 val >= 255 ? 2 * data->pwm1_freq :
228 (val * data->pwm1_freq * 2 + 127) / 255;
229 i2c_smbus_write_byte_data(client, LM63_REG_PWM_VALUE, data->pwm1_value);
230 up(&data->update_lock);
234 static ssize_t show_pwm1_enable(struct device *dev, struct device_attribute *dummy,
237 struct lm63_data *data = lm63_update_device(dev);
238 return sprintf(buf, "%d\n", data->config_fan & 0x20 ? 1 : 2);
241 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
244 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
245 struct lm63_data *data = lm63_update_device(dev);
246 return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index]));
249 static ssize_t set_temp8(struct device *dev, struct device_attribute *dummy,
250 const char *buf, size_t count)
252 struct i2c_client *client = to_i2c_client(dev);
253 struct lm63_data *data = i2c_get_clientdata(client);
254 long val = simple_strtol(buf, NULL, 10);
256 down(&data->update_lock);
257 data->temp8[1] = TEMP8_TO_REG(val);
258 i2c_smbus_write_byte_data(client, LM63_REG_LOCAL_HIGH, data->temp8[1]);
259 up(&data->update_lock);
263 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
266 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
267 struct lm63_data *data = lm63_update_device(dev);
268 return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index]));
271 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
272 const char *buf, size_t count)
274 static const u8 reg[4] = {
275 LM63_REG_REMOTE_LOW_MSB,
276 LM63_REG_REMOTE_LOW_LSB,
277 LM63_REG_REMOTE_HIGH_MSB,
278 LM63_REG_REMOTE_HIGH_LSB,
281 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
282 struct i2c_client *client = to_i2c_client(dev);
283 struct lm63_data *data = i2c_get_clientdata(client);
284 long val = simple_strtol(buf, NULL, 10);
285 int nr = attr->index;
287 down(&data->update_lock);
288 data->temp11[nr] = TEMP11_TO_REG(val);
289 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
290 data->temp11[nr] >> 8);
291 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
292 data->temp11[nr] & 0xff);
293 up(&data->update_lock);
297 /* Hysteresis register holds a relative value, while we want to present
298 an absolute to user-space */
299 static ssize_t show_temp2_crit_hyst(struct device *dev, struct device_attribute *dummy,
302 struct lm63_data *data = lm63_update_device(dev);
303 return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[2])
304 - TEMP8_FROM_REG(data->temp2_crit_hyst));
307 /* And now the other way around, user-space provides an absolute
308 hysteresis value and we have to store a relative one */
309 static ssize_t set_temp2_crit_hyst(struct device *dev, struct device_attribute *dummy,
310 const char *buf, size_t count)
312 struct i2c_client *client = to_i2c_client(dev);
313 struct lm63_data *data = i2c_get_clientdata(client);
314 long val = simple_strtol(buf, NULL, 10);
317 down(&data->update_lock);
318 hyst = TEMP8_FROM_REG(data->temp8[2]) - val;
319 i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
321 up(&data->update_lock);
325 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
328 struct lm63_data *data = lm63_update_device(dev);
329 return sprintf(buf, "%u\n", data->alarms);
332 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
333 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
336 static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1);
337 static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);
339 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
340 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
343 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
344 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
346 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
348 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp8, NULL, 2);
349 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
350 set_temp2_crit_hyst);
352 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
358 static int lm63_attach_adapter(struct i2c_adapter *adapter)
360 if (!(adapter->class & I2C_CLASS_HWMON))
362 return i2c_probe(adapter, &addr_data, lm63_detect);
366 * The following function does more than just detection. If detection
367 * succeeds, it also registers the new chip.
369 static int lm63_detect(struct i2c_adapter *adapter, int address, int kind)
371 struct i2c_client *new_client;
372 struct lm63_data *data;
375 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
378 if (!(data = kmalloc(sizeof(struct lm63_data), GFP_KERNEL))) {
382 memset(data, 0, sizeof(struct lm63_data));
384 /* The common I2C client data is placed right before the
385 LM63-specific data. */
386 new_client = &data->client;
387 i2c_set_clientdata(new_client, data);
388 new_client->addr = address;
389 new_client->adapter = adapter;
390 new_client->driver = &lm63_driver;
391 new_client->flags = 0;
393 /* Default to an LM63 if forced */
397 if (kind < 0) { /* must identify */
398 u8 man_id, chip_id, reg_config1, reg_config2;
399 u8 reg_alert_status, reg_alert_mask;
401 man_id = i2c_smbus_read_byte_data(new_client,
403 chip_id = i2c_smbus_read_byte_data(new_client,
405 reg_config1 = i2c_smbus_read_byte_data(new_client,
407 reg_config2 = i2c_smbus_read_byte_data(new_client,
409 reg_alert_status = i2c_smbus_read_byte_data(new_client,
410 LM63_REG_ALERT_STATUS);
411 reg_alert_mask = i2c_smbus_read_byte_data(new_client,
412 LM63_REG_ALERT_MASK);
414 if (man_id == 0x01 /* National Semiconductor */
415 && chip_id == 0x41 /* LM63 */
416 && (reg_config1 & 0x18) == 0x00
417 && (reg_config2 & 0xF8) == 0x00
418 && (reg_alert_status & 0x20) == 0x00
419 && (reg_alert_mask & 0xA4) == 0xA4) {
421 } else { /* failed */
422 dev_dbg(&adapter->dev, "Unsupported chip "
423 "(man_id=0x%02X, chip_id=0x%02X).\n",
429 strlcpy(new_client->name, "lm63", I2C_NAME_SIZE);
431 init_MUTEX(&data->update_lock);
433 /* Tell the I2C layer a new client has arrived */
434 if ((err = i2c_attach_client(new_client)))
437 /* Initialize the LM63 chip */
438 lm63_init_client(new_client);
440 /* Register sysfs hooks */
441 data->class_dev = hwmon_device_register(&new_client->dev);
442 if (IS_ERR(data->class_dev)) {
443 err = PTR_ERR(data->class_dev);
447 if (data->config & 0x04) { /* tachometer enabled */
448 device_create_file(&new_client->dev,
449 &sensor_dev_attr_fan1_input.dev_attr);
450 device_create_file(&new_client->dev,
451 &sensor_dev_attr_fan1_min.dev_attr);
453 device_create_file(&new_client->dev, &dev_attr_pwm1);
454 device_create_file(&new_client->dev, &dev_attr_pwm1_enable);
455 device_create_file(&new_client->dev,
456 &sensor_dev_attr_temp1_input.dev_attr);
457 device_create_file(&new_client->dev,
458 &sensor_dev_attr_temp2_input.dev_attr);
459 device_create_file(&new_client->dev,
460 &sensor_dev_attr_temp2_min.dev_attr);
461 device_create_file(&new_client->dev,
462 &sensor_dev_attr_temp1_max.dev_attr);
463 device_create_file(&new_client->dev,
464 &sensor_dev_attr_temp2_max.dev_attr);
465 device_create_file(&new_client->dev,
466 &sensor_dev_attr_temp2_crit.dev_attr);
467 device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
468 device_create_file(&new_client->dev, &dev_attr_alarms);
473 i2c_detach_client(new_client);
480 /* Idealy we shouldn't have to initialize anything, since the BIOS
481 should have taken care of everything */
482 static void lm63_init_client(struct i2c_client *client)
484 struct lm63_data *data = i2c_get_clientdata(client);
486 data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
487 data->config_fan = i2c_smbus_read_byte_data(client,
488 LM63_REG_CONFIG_FAN);
490 /* Start converting if needed */
491 if (data->config & 0x40) { /* standby */
492 dev_dbg(&client->dev, "Switching to operational mode");
493 data->config &= 0xA7;
494 i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,
498 /* We may need pwm1_freq before ever updating the client data */
499 data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
500 if (data->pwm1_freq == 0)
503 /* Show some debug info about the LM63 configuration */
504 dev_dbg(&client->dev, "Alert/tach pin configured for %s\n",
505 (data->config & 0x04) ? "tachometer input" :
507 dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n",
508 (data->config_fan & 0x08) ? "1.4" : "360",
509 ((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq);
510 dev_dbg(&client->dev, "PWM output active %s, %s mode\n",
511 (data->config_fan & 0x10) ? "low" : "high",
512 (data->config_fan & 0x20) ? "manual" : "auto");
515 static int lm63_detach_client(struct i2c_client *client)
517 struct lm63_data *data = i2c_get_clientdata(client);
520 hwmon_device_unregister(data->class_dev);
522 if ((err = i2c_detach_client(client)))
529 static struct lm63_data *lm63_update_device(struct device *dev)
531 struct i2c_client *client = to_i2c_client(dev);
532 struct lm63_data *data = i2c_get_clientdata(client);
534 down(&data->update_lock);
536 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
537 if (data->config & 0x04) { /* tachometer enabled */
538 /* order matters for fan1_input */
539 data->fan[0] = i2c_smbus_read_byte_data(client,
540 LM63_REG_TACH_COUNT_LSB) & 0xFC;
541 data->fan[0] |= i2c_smbus_read_byte_data(client,
542 LM63_REG_TACH_COUNT_MSB) << 8;
543 data->fan[1] = (i2c_smbus_read_byte_data(client,
544 LM63_REG_TACH_LIMIT_LSB) & 0xFC)
545 | (i2c_smbus_read_byte_data(client,
546 LM63_REG_TACH_LIMIT_MSB) << 8);
549 data->pwm1_freq = i2c_smbus_read_byte_data(client,
551 if (data->pwm1_freq == 0)
553 data->pwm1_value = i2c_smbus_read_byte_data(client,
556 data->temp8[0] = i2c_smbus_read_byte_data(client,
557 LM63_REG_LOCAL_TEMP);
558 data->temp8[1] = i2c_smbus_read_byte_data(client,
559 LM63_REG_LOCAL_HIGH);
561 /* order matters for temp2_input */
562 data->temp11[0] = i2c_smbus_read_byte_data(client,
563 LM63_REG_REMOTE_TEMP_MSB) << 8;
564 data->temp11[0] |= i2c_smbus_read_byte_data(client,
565 LM63_REG_REMOTE_TEMP_LSB);
566 data->temp11[1] = (i2c_smbus_read_byte_data(client,
567 LM63_REG_REMOTE_LOW_MSB) << 8)
568 | i2c_smbus_read_byte_data(client,
569 LM63_REG_REMOTE_LOW_LSB);
570 data->temp11[2] = (i2c_smbus_read_byte_data(client,
571 LM63_REG_REMOTE_HIGH_MSB) << 8)
572 | i2c_smbus_read_byte_data(client,
573 LM63_REG_REMOTE_HIGH_LSB);
574 data->temp8[2] = i2c_smbus_read_byte_data(client,
575 LM63_REG_REMOTE_TCRIT);
576 data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,
577 LM63_REG_REMOTE_TCRIT_HYST);
579 data->alarms = i2c_smbus_read_byte_data(client,
580 LM63_REG_ALERT_STATUS) & 0x7F;
582 data->last_updated = jiffies;
586 up(&data->update_lock);
591 static int __init sensors_lm63_init(void)
593 return i2c_add_driver(&lm63_driver);
596 static void __exit sensors_lm63_exit(void)
598 i2c_del_driver(&lm63_driver);
601 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
602 MODULE_DESCRIPTION("LM63 driver");
603 MODULE_LICENSE("GPL");
605 module_init(sensors_lm63_init);
606 module_exit(sensors_lm63_exit);