2 it87.c - Part of lm_sensors, Linux kernel modules for hardware
5 Supports: IT8705F Super I/O chip w/LPC interface
6 IT8712F Super I/O chip w/LPC interface & SMBus
7 Sis950 A clone of the IT8705F
9 Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com>
10 Largely inspired by lm78.c of the same package
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 djg@pdp8.net David Gesswein 7/18/01
29 Modified to fix bug with not all alarms enabled.
30 Added ability to read battery voltage and select temperature sensor
31 type at module load time.
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/slab.h>
37 #include <linux/jiffies.h>
38 #include <linux/i2c.h>
39 #include <linux/i2c-isa.h>
40 #include <linux/hwmon.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/hwmon-vid.h>
43 #include <linux/err.h>
47 /* Addresses to scan */
48 static unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
49 static unsigned short isa_address;
51 /* Insmod parameters */
52 I2C_CLIENT_INSMOD_2(it87, it8712);
54 #define REG 0x2e /* The register to read/write */
55 #define DEV 0x07 /* Register: Logical device select */
56 #define VAL 0x2f /* The value to read/write */
57 #define PME 0x04 /* The device with the fan registers in it */
58 #define DEVID 0x20 /* Register: Device ID */
59 #define DEVREV 0x22 /* Register: Device Revision */
68 static int superio_inw(int reg)
101 #define IT8712F_DEVID 0x8712
102 #define IT8705F_DEVID 0x8705
103 #define IT87_ACT_REG 0x30
104 #define IT87_BASE_REG 0x60
106 /* Update battery voltage after every reading if true */
107 static int update_vbat;
109 /* Not all BIOSes properly configure the PWM registers */
110 static int fix_pwm_polarity;
114 static u16 chip_type;
116 /* Many IT87 constants specified below */
118 /* Length of ISA address segment */
119 #define IT87_EXTENT 8
121 /* Where are the ISA address/data registers relative to the base address */
122 #define IT87_ADDR_REG_OFFSET 5
123 #define IT87_DATA_REG_OFFSET 6
125 /*----- The IT87 registers -----*/
127 #define IT87_REG_CONFIG 0x00
129 #define IT87_REG_ALARM1 0x01
130 #define IT87_REG_ALARM2 0x02
131 #define IT87_REG_ALARM3 0x03
133 #define IT87_REG_VID 0x0a
134 #define IT87_REG_FAN_DIV 0x0b
136 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
138 #define IT87_REG_FAN(nr) (0x0d + (nr))
139 #define IT87_REG_FAN_MIN(nr) (0x10 + (nr))
140 #define IT87_REG_FAN_MAIN_CTRL 0x13
141 #define IT87_REG_FAN_CTL 0x14
142 #define IT87_REG_PWM(nr) (0x15 + (nr))
144 #define IT87_REG_VIN(nr) (0x20 + (nr))
145 #define IT87_REG_TEMP(nr) (0x29 + (nr))
147 #define IT87_REG_VIN_MAX(nr) (0x30 + (nr) * 2)
148 #define IT87_REG_VIN_MIN(nr) (0x31 + (nr) * 2)
149 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
150 #define IT87_REG_TEMP_LOW(nr) (0x41 + (nr) * 2)
152 #define IT87_REG_I2C_ADDR 0x48
154 #define IT87_REG_VIN_ENABLE 0x50
155 #define IT87_REG_TEMP_ENABLE 0x51
157 #define IT87_REG_CHIPID 0x58
159 #define IN_TO_REG(val) (SENSORS_LIMIT((((val) + 8)/16),0,255))
160 #define IN_FROM_REG(val) ((val) * 16)
162 static inline u8 FAN_TO_REG(long rpm, int div)
166 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
167 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
171 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
173 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
174 ((val)+500)/1000),-128,127))
175 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
177 #define PWM_TO_REG(val) ((val) >> 1)
178 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
180 static int DIV_TO_REG(int val)
183 while ((val >>= 1) != 0)
187 #define DIV_FROM_REG(val) (1 << (val))
190 /* For each registered IT87, we need to keep some data in memory. That
191 data is pointed to by it87_list[NR]->data. The structure itself is
192 dynamically allocated, at the same time when a new it87 client is
195 struct i2c_client client;
196 struct class_device *class_dev;
197 struct semaphore lock;
200 struct semaphore update_lock;
201 char valid; /* !=0 if following fields are valid */
202 unsigned long last_updated; /* In jiffies */
204 u8 in[9]; /* Register value */
205 u8 in_max[9]; /* Register value */
206 u8 in_min[9]; /* Register value */
207 u8 fan[3]; /* Register value */
208 u8 fan_min[3]; /* Register value */
209 u8 temp[3]; /* Register value */
210 u8 temp_high[3]; /* Register value */
211 u8 temp_low[3]; /* Register value */
212 u8 sensor; /* Register value */
213 u8 fan_div[3]; /* Register encoding, shifted right */
214 u8 vid; /* Register encoding, combined */
216 u32 alarms; /* Register encoding, combined */
217 u8 fan_main_ctrl; /* Register value */
218 u8 manual_pwm_ctl[3]; /* manual PWM value set by user */
222 static int it87_attach_adapter(struct i2c_adapter *adapter);
223 static int it87_isa_attach_adapter(struct i2c_adapter *adapter);
224 static int it87_detect(struct i2c_adapter *adapter, int address, int kind);
225 static int it87_detach_client(struct i2c_client *client);
227 static int it87_read_value(struct i2c_client *client, u8 register);
228 static int it87_write_value(struct i2c_client *client, u8 register,
230 static struct it87_data *it87_update_device(struct device *dev);
231 static int it87_check_pwm(struct i2c_client *client);
232 static void it87_init_client(struct i2c_client *client, struct it87_data *data);
235 static struct i2c_driver it87_driver = {
239 .id = I2C_DRIVERID_IT87,
240 .attach_adapter = it87_attach_adapter,
241 .detach_client = it87_detach_client,
244 static struct i2c_driver it87_isa_driver = {
248 .attach_adapter = it87_isa_attach_adapter,
249 .detach_client = it87_detach_client,
253 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
256 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
257 int nr = sensor_attr->index;
259 struct it87_data *data = it87_update_device(dev);
260 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
263 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
266 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
267 int nr = sensor_attr->index;
269 struct it87_data *data = it87_update_device(dev);
270 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
273 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
276 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
277 int nr = sensor_attr->index;
279 struct it87_data *data = it87_update_device(dev);
280 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
283 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
284 const char *buf, size_t count)
286 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
287 int nr = sensor_attr->index;
289 struct i2c_client *client = to_i2c_client(dev);
290 struct it87_data *data = i2c_get_clientdata(client);
291 unsigned long val = simple_strtoul(buf, NULL, 10);
293 down(&data->update_lock);
294 data->in_min[nr] = IN_TO_REG(val);
295 it87_write_value(client, IT87_REG_VIN_MIN(nr),
297 up(&data->update_lock);
300 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
301 const char *buf, size_t count)
303 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
304 int nr = sensor_attr->index;
306 struct i2c_client *client = to_i2c_client(dev);
307 struct it87_data *data = i2c_get_clientdata(client);
308 unsigned long val = simple_strtoul(buf, NULL, 10);
310 down(&data->update_lock);
311 data->in_max[nr] = IN_TO_REG(val);
312 it87_write_value(client, IT87_REG_VIN_MAX(nr),
314 up(&data->update_lock);
318 #define show_in_offset(offset) \
319 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
320 show_in, NULL, offset);
322 #define limit_in_offset(offset) \
323 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
324 show_in_min, set_in_min, offset); \
325 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
326 show_in_max, set_in_max, offset);
347 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
350 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
351 int nr = sensor_attr->index;
353 struct it87_data *data = it87_update_device(dev);
354 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
356 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
359 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
360 int nr = sensor_attr->index;
362 struct it87_data *data = it87_update_device(dev);
363 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
365 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
368 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
369 int nr = sensor_attr->index;
371 struct it87_data *data = it87_update_device(dev);
372 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
374 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
375 const char *buf, size_t count)
377 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
378 int nr = sensor_attr->index;
380 struct i2c_client *client = to_i2c_client(dev);
381 struct it87_data *data = i2c_get_clientdata(client);
382 int val = simple_strtol(buf, NULL, 10);
384 down(&data->update_lock);
385 data->temp_high[nr] = TEMP_TO_REG(val);
386 it87_write_value(client, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
387 up(&data->update_lock);
390 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
391 const char *buf, size_t count)
393 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
394 int nr = sensor_attr->index;
396 struct i2c_client *client = to_i2c_client(dev);
397 struct it87_data *data = i2c_get_clientdata(client);
398 int val = simple_strtol(buf, NULL, 10);
400 down(&data->update_lock);
401 data->temp_low[nr] = TEMP_TO_REG(val);
402 it87_write_value(client, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
403 up(&data->update_lock);
406 #define show_temp_offset(offset) \
407 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
408 show_temp, NULL, offset - 1); \
409 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
410 show_temp_max, set_temp_max, offset - 1); \
411 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
412 show_temp_min, set_temp_min, offset - 1);
418 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
421 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
422 int nr = sensor_attr->index;
424 struct it87_data *data = it87_update_device(dev);
425 u8 reg = data->sensor; /* In case the value is updated while we use it */
428 return sprintf(buf, "3\n"); /* thermal diode */
430 return sprintf(buf, "2\n"); /* thermistor */
431 return sprintf(buf, "0\n"); /* disabled */
433 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
434 const char *buf, size_t count)
436 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
437 int nr = sensor_attr->index;
439 struct i2c_client *client = to_i2c_client(dev);
440 struct it87_data *data = i2c_get_clientdata(client);
441 int val = simple_strtol(buf, NULL, 10);
443 down(&data->update_lock);
445 data->sensor &= ~(1 << nr);
446 data->sensor &= ~(8 << nr);
447 /* 3 = thermal diode; 2 = thermistor; 0 = disabled */
449 data->sensor |= 1 << nr;
451 data->sensor |= 8 << nr;
453 up(&data->update_lock);
456 it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);
457 up(&data->update_lock);
460 #define show_sensor_offset(offset) \
461 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR, \
462 show_sensor, set_sensor, offset - 1);
464 show_sensor_offset(1);
465 show_sensor_offset(2);
466 show_sensor_offset(3);
469 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
472 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
473 int nr = sensor_attr->index;
475 struct it87_data *data = it87_update_device(dev);
476 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
477 DIV_FROM_REG(data->fan_div[nr])));
479 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
482 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
483 int nr = sensor_attr->index;
485 struct it87_data *data = it87_update_device(dev);
486 return sprintf(buf,"%d\n",
487 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
489 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
492 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
493 int nr = sensor_attr->index;
495 struct it87_data *data = it87_update_device(dev);
496 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
498 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
501 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
502 int nr = sensor_attr->index;
504 struct it87_data *data = it87_update_device(dev);
505 return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
507 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
510 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
511 int nr = sensor_attr->index;
513 struct it87_data *data = it87_update_device(dev);
514 return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
516 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
517 const char *buf, size_t count)
519 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
520 int nr = sensor_attr->index;
522 struct i2c_client *client = to_i2c_client(dev);
523 struct it87_data *data = i2c_get_clientdata(client);
524 int val = simple_strtol(buf, NULL, 10);
525 u8 reg = it87_read_value(client, IT87_REG_FAN_DIV);
527 down(&data->update_lock);
529 case 0: data->fan_div[nr] = reg & 0x07; break;
530 case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
531 case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
534 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
535 it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
536 up(&data->update_lock);
539 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
540 const char *buf, size_t count)
542 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
543 int nr = sensor_attr->index;
545 struct i2c_client *client = to_i2c_client(dev);
546 struct it87_data *data = i2c_get_clientdata(client);
547 int val = simple_strtol(buf, NULL, 10);
551 down(&data->update_lock);
552 old = it87_read_value(client, IT87_REG_FAN_DIV);
554 for (i = 0; i < 3; i++)
555 min[i] = FAN_FROM_REG(data->fan_min[i], DIV_FROM_REG(data->fan_div[i]));
560 data->fan_div[nr] = DIV_TO_REG(val);
564 data->fan_div[nr] = 1;
566 data->fan_div[nr] = 3;
569 val |= (data->fan_div[0] & 0x07);
570 val |= (data->fan_div[1] & 0x07) << 3;
571 if (data->fan_div[2] == 3)
573 it87_write_value(client, IT87_REG_FAN_DIV, val);
575 for (i = 0; i < 3; i++) {
576 data->fan_min[i]=FAN_TO_REG(min[i], DIV_FROM_REG(data->fan_div[i]));
577 it87_write_value(client, IT87_REG_FAN_MIN(i), data->fan_min[i]);
579 up(&data->update_lock);
582 static ssize_t set_pwm_enable(struct device *dev,
583 struct device_attribute *attr, const char *buf, size_t count)
585 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
586 int nr = sensor_attr->index;
588 struct i2c_client *client = to_i2c_client(dev);
589 struct it87_data *data = i2c_get_clientdata(client);
590 int val = simple_strtol(buf, NULL, 10);
592 down(&data->update_lock);
596 /* make sure the fan is on when in on/off mode */
597 tmp = it87_read_value(client, IT87_REG_FAN_CTL);
598 it87_write_value(client, IT87_REG_FAN_CTL, tmp | (1 << nr));
599 /* set on/off mode */
600 data->fan_main_ctrl &= ~(1 << nr);
601 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
602 } else if (val == 1) {
603 /* set SmartGuardian mode */
604 data->fan_main_ctrl |= (1 << nr);
605 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
606 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
607 it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
609 up(&data->update_lock);
613 up(&data->update_lock);
616 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
617 const char *buf, size_t count)
619 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
620 int nr = sensor_attr->index;
622 struct i2c_client *client = to_i2c_client(dev);
623 struct it87_data *data = i2c_get_clientdata(client);
624 int val = simple_strtol(buf, NULL, 10);
626 if (val < 0 || val > 255)
629 down(&data->update_lock);
630 data->manual_pwm_ctl[nr] = val;
631 if (data->fan_main_ctrl & (1 << nr))
632 it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
633 up(&data->update_lock);
637 #define show_fan_offset(offset) \
638 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
639 show_fan, NULL, offset - 1); \
640 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
641 show_fan_min, set_fan_min, offset - 1); \
642 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
643 show_fan_div, set_fan_div, offset - 1);
649 #define show_pwm_offset(offset) \
650 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
651 show_pwm_enable, set_pwm_enable, offset - 1); \
652 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
653 show_pwm, set_pwm, offset - 1);
660 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
662 struct it87_data *data = it87_update_device(dev);
663 return sprintf(buf, "%u\n", data->alarms);
665 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
668 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
670 struct it87_data *data = it87_update_device(dev);
671 return sprintf(buf, "%u\n", data->vrm);
674 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
676 struct i2c_client *client = to_i2c_client(dev);
677 struct it87_data *data = i2c_get_clientdata(client);
680 val = simple_strtoul(buf, NULL, 10);
685 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
686 #define device_create_file_vrm(client) \
687 device_create_file(&client->dev, &dev_attr_vrm)
690 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
692 struct it87_data *data = it87_update_device(dev);
693 return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
695 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
696 #define device_create_file_vid(client) \
697 device_create_file(&client->dev, &dev_attr_cpu0_vid)
699 /* This function is called when:
700 * it87_driver is inserted (when this module is loaded), for each
702 * when a new adapter is inserted (and it87_driver is still present) */
703 static int it87_attach_adapter(struct i2c_adapter *adapter)
705 if (!(adapter->class & I2C_CLASS_HWMON))
707 return i2c_probe(adapter, &addr_data, it87_detect);
710 static int it87_isa_attach_adapter(struct i2c_adapter *adapter)
712 return it87_detect(adapter, isa_address, -1);
715 /* SuperIO detection - will change isa_address if a chip is found */
716 static int __init it87_find(unsigned short *address)
721 chip_type = superio_inw(DEVID);
722 if (chip_type != IT8712F_DEVID
723 && chip_type != IT8705F_DEVID)
727 if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
728 pr_info("it87: Device not activated, skipping\n");
732 *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
734 pr_info("it87: Base address not set, skipping\n");
739 pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
740 chip_type, *address, superio_inb(DEVREV) & 0x0f);
747 /* This function is called by i2c_probe */
748 static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
751 struct i2c_client *new_client;
752 struct it87_data *data;
754 const char *name = "";
755 int is_isa = i2c_is_isa_adapter(adapter);
756 int enable_pwm_interface;
759 !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
762 /* Reserve the ISA region */
764 if (!request_region(address, IT87_EXTENT,
765 it87_isa_driver.driver.name))
768 /* For now, we presume we have a valid client. We create the
769 client structure, even though we cannot fill it completely yet.
770 But it allows us to access it87_{read,write}_value. */
772 if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
777 new_client = &data->client;
779 init_MUTEX(&data->lock);
780 i2c_set_clientdata(new_client, data);
781 new_client->addr = address;
782 new_client->adapter = adapter;
783 new_client->driver = is_isa ? &it87_isa_driver : &it87_driver;
784 new_client->flags = 0;
786 /* Now, we do the remaining detection. */
789 if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
791 && it87_read_value(new_client, IT87_REG_I2C_ADDR) != address)) {
797 /* Determine the chip type. */
799 i = it87_read_value(new_client, IT87_REG_CHIPID);
802 if ((is_isa) && (chip_type == IT8712F_DEVID))
807 dev_info(&adapter->dev,
808 "Ignoring 'force' parameter for unknown chip at "
809 "adapter %d, address 0x%02x\n",
810 i2c_adapter_id(adapter), address);
818 } else if (kind == it8712) {
822 /* Fill in the remaining client fields and put it into the global list */
823 strlcpy(new_client->name, name, I2C_NAME_SIZE);
826 init_MUTEX(&data->update_lock);
828 /* Tell the I2C layer a new client has arrived */
829 if ((err = i2c_attach_client(new_client)))
833 dev_info(&new_client->dev, "The I2C interface to IT87xxF "
834 "hardware monitoring chips is deprecated. Please "
835 "report if you still rely on it.\n");
837 /* Check PWM configuration */
838 enable_pwm_interface = it87_check_pwm(new_client);
840 /* Initialize the IT87 chip */
841 it87_init_client(new_client, data);
843 /* Register sysfs hooks */
844 data->class_dev = hwmon_device_register(&new_client->dev);
845 if (IS_ERR(data->class_dev)) {
846 err = PTR_ERR(data->class_dev);
850 device_create_file(&new_client->dev, &sensor_dev_attr_in0_input.dev_attr);
851 device_create_file(&new_client->dev, &sensor_dev_attr_in1_input.dev_attr);
852 device_create_file(&new_client->dev, &sensor_dev_attr_in2_input.dev_attr);
853 device_create_file(&new_client->dev, &sensor_dev_attr_in3_input.dev_attr);
854 device_create_file(&new_client->dev, &sensor_dev_attr_in4_input.dev_attr);
855 device_create_file(&new_client->dev, &sensor_dev_attr_in5_input.dev_attr);
856 device_create_file(&new_client->dev, &sensor_dev_attr_in6_input.dev_attr);
857 device_create_file(&new_client->dev, &sensor_dev_attr_in7_input.dev_attr);
858 device_create_file(&new_client->dev, &sensor_dev_attr_in8_input.dev_attr);
859 device_create_file(&new_client->dev, &sensor_dev_attr_in0_min.dev_attr);
860 device_create_file(&new_client->dev, &sensor_dev_attr_in1_min.dev_attr);
861 device_create_file(&new_client->dev, &sensor_dev_attr_in2_min.dev_attr);
862 device_create_file(&new_client->dev, &sensor_dev_attr_in3_min.dev_attr);
863 device_create_file(&new_client->dev, &sensor_dev_attr_in4_min.dev_attr);
864 device_create_file(&new_client->dev, &sensor_dev_attr_in5_min.dev_attr);
865 device_create_file(&new_client->dev, &sensor_dev_attr_in6_min.dev_attr);
866 device_create_file(&new_client->dev, &sensor_dev_attr_in7_min.dev_attr);
867 device_create_file(&new_client->dev, &sensor_dev_attr_in0_max.dev_attr);
868 device_create_file(&new_client->dev, &sensor_dev_attr_in1_max.dev_attr);
869 device_create_file(&new_client->dev, &sensor_dev_attr_in2_max.dev_attr);
870 device_create_file(&new_client->dev, &sensor_dev_attr_in3_max.dev_attr);
871 device_create_file(&new_client->dev, &sensor_dev_attr_in4_max.dev_attr);
872 device_create_file(&new_client->dev, &sensor_dev_attr_in5_max.dev_attr);
873 device_create_file(&new_client->dev, &sensor_dev_attr_in6_max.dev_attr);
874 device_create_file(&new_client->dev, &sensor_dev_attr_in7_max.dev_attr);
875 device_create_file(&new_client->dev, &sensor_dev_attr_temp1_input.dev_attr);
876 device_create_file(&new_client->dev, &sensor_dev_attr_temp2_input.dev_attr);
877 device_create_file(&new_client->dev, &sensor_dev_attr_temp3_input.dev_attr);
878 device_create_file(&new_client->dev, &sensor_dev_attr_temp1_max.dev_attr);
879 device_create_file(&new_client->dev, &sensor_dev_attr_temp2_max.dev_attr);
880 device_create_file(&new_client->dev, &sensor_dev_attr_temp3_max.dev_attr);
881 device_create_file(&new_client->dev, &sensor_dev_attr_temp1_min.dev_attr);
882 device_create_file(&new_client->dev, &sensor_dev_attr_temp2_min.dev_attr);
883 device_create_file(&new_client->dev, &sensor_dev_attr_temp3_min.dev_attr);
884 device_create_file(&new_client->dev, &sensor_dev_attr_temp1_type.dev_attr);
885 device_create_file(&new_client->dev, &sensor_dev_attr_temp2_type.dev_attr);
886 device_create_file(&new_client->dev, &sensor_dev_attr_temp3_type.dev_attr);
887 device_create_file(&new_client->dev, &sensor_dev_attr_fan1_input.dev_attr);
888 device_create_file(&new_client->dev, &sensor_dev_attr_fan2_input.dev_attr);
889 device_create_file(&new_client->dev, &sensor_dev_attr_fan3_input.dev_attr);
890 device_create_file(&new_client->dev, &sensor_dev_attr_fan1_min.dev_attr);
891 device_create_file(&new_client->dev, &sensor_dev_attr_fan2_min.dev_attr);
892 device_create_file(&new_client->dev, &sensor_dev_attr_fan3_min.dev_attr);
893 device_create_file(&new_client->dev, &sensor_dev_attr_fan1_div.dev_attr);
894 device_create_file(&new_client->dev, &sensor_dev_attr_fan2_div.dev_attr);
895 device_create_file(&new_client->dev, &sensor_dev_attr_fan3_div.dev_attr);
896 device_create_file(&new_client->dev, &dev_attr_alarms);
897 if (enable_pwm_interface) {
898 device_create_file(&new_client->dev, &sensor_dev_attr_pwm1_enable.dev_attr);
899 device_create_file(&new_client->dev, &sensor_dev_attr_pwm2_enable.dev_attr);
900 device_create_file(&new_client->dev, &sensor_dev_attr_pwm3_enable.dev_attr);
901 device_create_file(&new_client->dev, &sensor_dev_attr_pwm1.dev_attr);
902 device_create_file(&new_client->dev, &sensor_dev_attr_pwm2.dev_attr);
903 device_create_file(&new_client->dev, &sensor_dev_attr_pwm3.dev_attr);
906 if (data->type == it8712) {
907 data->vrm = vid_which_vrm();
908 device_create_file_vrm(new_client);
909 device_create_file_vid(new_client);
915 i2c_detach_client(new_client);
920 release_region(address, IT87_EXTENT);
925 static int it87_detach_client(struct i2c_client *client)
927 struct it87_data *data = i2c_get_clientdata(client);
930 hwmon_device_unregister(data->class_dev);
932 if ((err = i2c_detach_client(client)))
935 if(i2c_is_isa_client(client))
936 release_region(client->addr, IT87_EXTENT);
942 /* The SMBus locks itself, but ISA access must be locked explicitly!
943 We don't want to lock the whole ISA bus, so we lock each client
945 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
946 would slow down the IT87 access and should not be necessary. */
947 static int it87_read_value(struct i2c_client *client, u8 reg)
949 struct it87_data *data = i2c_get_clientdata(client);
952 if (i2c_is_isa_client(client)) {
954 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
955 res = inb_p(client->addr + IT87_DATA_REG_OFFSET);
959 return i2c_smbus_read_byte_data(client, reg);
962 /* The SMBus locks itself, but ISA access muse be locked explicitly!
963 We don't want to lock the whole ISA bus, so we lock each client
965 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
966 would slow down the IT87 access and should not be necessary. */
967 static int it87_write_value(struct i2c_client *client, u8 reg, u8 value)
969 struct it87_data *data = i2c_get_clientdata(client);
971 if (i2c_is_isa_client(client)) {
973 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
974 outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
978 return i2c_smbus_write_byte_data(client, reg, value);
981 /* Return 1 if and only if the PWM interface is safe to use */
982 static int it87_check_pwm(struct i2c_client *client)
984 /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
985 * and polarity set to active low is sign that this is the case so we
986 * disable pwm control to protect the user. */
987 int tmp = it87_read_value(client, IT87_REG_FAN_CTL);
988 if ((tmp & 0x87) == 0) {
989 if (fix_pwm_polarity) {
990 /* The user asks us to attempt a chip reconfiguration.
991 * This means switching to active high polarity and
992 * inverting all fan speed values. */
996 for (i = 0; i < 3; i++)
997 pwm[i] = it87_read_value(client,
1000 /* If any fan is in automatic pwm mode, the polarity
1001 * might be correct, as suspicious as it seems, so we
1002 * better don't change anything (but still disable the
1003 * PWM interface). */
1004 if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1005 dev_info(&client->dev, "Reconfiguring PWM to "
1006 "active high polarity\n");
1007 it87_write_value(client, IT87_REG_FAN_CTL,
1009 for (i = 0; i < 3; i++)
1010 it87_write_value(client,
1016 dev_info(&client->dev, "PWM configuration is "
1017 "too broken to be fixed\n");
1020 dev_info(&client->dev, "Detected broken BIOS "
1021 "defaults, disabling PWM interface\n");
1023 } else if (fix_pwm_polarity) {
1024 dev_info(&client->dev, "PWM configuration looks "
1025 "sane, won't touch\n");
1031 /* Called when we have found a new IT87. */
1032 static void it87_init_client(struct i2c_client *client, struct it87_data *data)
1036 /* initialize to sane defaults:
1037 * - if the chip is in manual pwm mode, this will be overwritten with
1038 * the actual settings on the chip (so in this case, initialization
1040 * - if in automatic or on/off mode, we could switch to manual mode,
1041 * read the registers and set manual_pwm_ctl accordingly, but currently
1042 * this is not implemented, so we initialize to something sane */
1043 for (i = 0; i < 3; i++) {
1044 data->manual_pwm_ctl[i] = 0xff;
1047 /* Check if temperature channnels are reset manually or by some reason */
1048 tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1049 if ((tmp & 0x3f) == 0) {
1050 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1051 tmp = (tmp & 0xc0) | 0x2a;
1052 it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
1056 /* Check if voltage monitors are reset manually or by some reason */
1057 tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
1058 if ((tmp & 0xff) == 0) {
1059 /* Enable all voltage monitors */
1060 it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
1063 /* Check if tachometers are reset manually or by some reason */
1064 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1065 if ((data->fan_main_ctrl & 0x70) == 0) {
1066 /* Enable all fan tachometers */
1067 data->fan_main_ctrl |= 0x70;
1068 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1071 /* Set current fan mode registers and the default settings for the
1072 * other mode registers */
1073 for (i = 0; i < 3; i++) {
1074 if (data->fan_main_ctrl & (1 << i)) {
1076 tmp = it87_read_value(client, IT87_REG_PWM(i));
1078 /* automatic pwm - not yet implemented, but
1079 * leave the settings made by the BIOS alone
1080 * until a change is requested via the sysfs
1084 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1089 /* Start monitoring */
1090 it87_write_value(client, IT87_REG_CONFIG,
1091 (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
1092 | (update_vbat ? 0x41 : 0x01));
1095 static struct it87_data *it87_update_device(struct device *dev)
1097 struct i2c_client *client = to_i2c_client(dev);
1098 struct it87_data *data = i2c_get_clientdata(client);
1101 down(&data->update_lock);
1103 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1107 /* Cleared after each update, so reenable. Value
1108 returned by this read will be previous value */
1109 it87_write_value(client, IT87_REG_CONFIG,
1110 it87_read_value(client, IT87_REG_CONFIG) | 0x40);
1112 for (i = 0; i <= 7; i++) {
1114 it87_read_value(client, IT87_REG_VIN(i));
1116 it87_read_value(client, IT87_REG_VIN_MIN(i));
1118 it87_read_value(client, IT87_REG_VIN_MAX(i));
1121 it87_read_value(client, IT87_REG_VIN(8));
1122 /* Temperature sensor doesn't have limit registers, set
1123 to min and max value */
1124 data->in_min[8] = 0;
1125 data->in_max[8] = 255;
1127 for (i = 0; i < 3; i++) {
1129 it87_read_value(client, IT87_REG_FAN(i));
1131 it87_read_value(client, IT87_REG_FAN_MIN(i));
1133 for (i = 0; i < 3; i++) {
1135 it87_read_value(client, IT87_REG_TEMP(i));
1136 data->temp_high[i] =
1137 it87_read_value(client, IT87_REG_TEMP_HIGH(i));
1139 it87_read_value(client, IT87_REG_TEMP_LOW(i));
1142 i = it87_read_value(client, IT87_REG_FAN_DIV);
1143 data->fan_div[0] = i & 0x07;
1144 data->fan_div[1] = (i >> 3) & 0x07;
1145 data->fan_div[2] = (i & 0x40) ? 3 : 1;
1148 it87_read_value(client, IT87_REG_ALARM1) |
1149 (it87_read_value(client, IT87_REG_ALARM2) << 8) |
1150 (it87_read_value(client, IT87_REG_ALARM3) << 16);
1151 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1153 data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1154 /* The 8705 does not have VID capability */
1155 if (data->type == it8712) {
1156 data->vid = it87_read_value(client, IT87_REG_VID);
1159 data->last_updated = jiffies;
1163 up(&data->update_lock);
1168 static int __init sm_it87_init(void)
1172 res = i2c_add_driver(&it87_driver);
1176 if (!it87_find(&isa_address)) {
1177 res = i2c_isa_add_driver(&it87_isa_driver);
1179 i2c_del_driver(&it87_driver);
1187 static void __exit sm_it87_exit(void)
1190 i2c_isa_del_driver(&it87_isa_driver);
1191 i2c_del_driver(&it87_driver);
1195 MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>");
1196 MODULE_DESCRIPTION("IT8705F, IT8712F, Sis950 driver");
1197 module_param(update_vbat, bool, 0);
1198 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1199 module_param(fix_pwm_polarity, bool, 0);
1200 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1201 MODULE_LICENSE("GPL");
1203 module_init(sm_it87_init);
1204 module_exit(sm_it87_exit);