2 lm78.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/jiffies.h>
25 #include <linux/i2c.h>
26 #include <linux/i2c-isa.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-vid.h>
29 #include <linux/err.h>
30 #include <linux/mutex.h>
33 /* Addresses to scan */
34 static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
35 0x25, 0x26, 0x27, 0x28, 0x29,
36 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
37 0x2f, I2C_CLIENT_END };
38 static unsigned short isa_address = 0x290;
40 /* Insmod parameters */
41 I2C_CLIENT_INSMOD_2(lm78, lm79);
43 /* Many LM78 constants specified below */
45 /* Length of ISA address segment */
48 /* Where are the ISA address/data registers relative to the base address */
49 #define LM78_ADDR_REG_OFFSET 5
50 #define LM78_DATA_REG_OFFSET 6
52 /* The LM78 registers */
53 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
54 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
55 #define LM78_REG_IN(nr) (0x20 + (nr))
57 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
58 #define LM78_REG_FAN(nr) (0x28 + (nr))
60 #define LM78_REG_TEMP 0x27
61 #define LM78_REG_TEMP_OVER 0x39
62 #define LM78_REG_TEMP_HYST 0x3a
64 #define LM78_REG_ALARM1 0x41
65 #define LM78_REG_ALARM2 0x42
67 #define LM78_REG_VID_FANDIV 0x47
69 #define LM78_REG_CONFIG 0x40
70 #define LM78_REG_CHIPID 0x49
71 #define LM78_REG_I2C_ADDR 0x48
74 /* Conversions. Rounding and limit checking is only done on the TO_REG
77 /* IN: mV, (0V to 4.08V)
79 static inline u8 IN_TO_REG(unsigned long val)
81 unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
82 return (nval + 8) / 16;
84 #define IN_FROM_REG(val) ((val) * 16)
86 static inline u8 FAN_TO_REG(long rpm, int div)
90 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
93 static inline int FAN_FROM_REG(u8 val, int div)
95 return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
98 /* TEMP: mC (-128C to +127C)
99 REG: 1C/bit, two's complement */
100 static inline s8 TEMP_TO_REG(int val)
102 int nval = SENSORS_LIMIT(val, -128000, 127000) ;
103 return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
106 static inline int TEMP_FROM_REG(s8 val)
111 #define DIV_FROM_REG(val) (1 << (val))
113 /* There are some complications in a module like this. First off, LM78 chips
114 may be both present on the SMBus and the ISA bus, and we have to handle
115 those cases separately at some places. Second, there might be several
116 LM78 chips available (well, actually, that is probably never done; but
117 it is a clean illustration of how to handle a case like that). Finally,
118 a specific chip may be attached to *both* ISA and SMBus, and we would
119 not like to detect it double. Fortunately, in the case of the LM78 at
120 least, a register tells us what SMBus address we are on, so that helps
121 a bit - except if there could be more than one SMBus. Groan. No solution
124 /* This module may seem overly long and complicated. In fact, it is not so
125 bad. Quite a lot of bookkeeping is done. A real driver can often cut
128 /* For each registered LM78, we need to keep some data in memory. That
129 data is pointed to by lm78_list[NR]->data. The structure itself is
130 dynamically allocated, at the same time when a new lm78 client is
133 struct i2c_client client;
134 struct class_device *class_dev;
138 struct mutex update_lock;
139 char valid; /* !=0 if following fields are valid */
140 unsigned long last_updated; /* In jiffies */
142 u8 in[7]; /* Register value */
143 u8 in_max[7]; /* Register value */
144 u8 in_min[7]; /* Register value */
145 u8 fan[3]; /* Register value */
146 u8 fan_min[3]; /* Register value */
147 s8 temp; /* Register value */
148 s8 temp_over; /* Register value */
149 s8 temp_hyst; /* Register value */
150 u8 fan_div[3]; /* Register encoding, shifted right */
151 u8 vid; /* Register encoding, combined */
152 u16 alarms; /* Register encoding, combined */
156 static int lm78_attach_adapter(struct i2c_adapter *adapter);
157 static int lm78_isa_attach_adapter(struct i2c_adapter *adapter);
158 static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
159 static int lm78_detach_client(struct i2c_client *client);
161 static int lm78_read_value(struct i2c_client *client, u8 reg);
162 static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value);
163 static struct lm78_data *lm78_update_device(struct device *dev);
164 static void lm78_init_client(struct i2c_client *client);
167 static struct i2c_driver lm78_driver = {
171 .id = I2C_DRIVERID_LM78,
172 .attach_adapter = lm78_attach_adapter,
173 .detach_client = lm78_detach_client,
176 static struct i2c_driver lm78_isa_driver = {
178 .owner = THIS_MODULE,
181 .attach_adapter = lm78_isa_attach_adapter,
182 .detach_client = lm78_detach_client,
187 static ssize_t show_in(struct device *dev, char *buf, int nr)
189 struct lm78_data *data = lm78_update_device(dev);
190 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
193 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
195 struct lm78_data *data = lm78_update_device(dev);
196 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
199 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
201 struct lm78_data *data = lm78_update_device(dev);
202 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
205 static ssize_t set_in_min(struct device *dev, const char *buf,
206 size_t count, int nr)
208 struct i2c_client *client = to_i2c_client(dev);
209 struct lm78_data *data = i2c_get_clientdata(client);
210 unsigned long val = simple_strtoul(buf, NULL, 10);
212 mutex_lock(&data->update_lock);
213 data->in_min[nr] = IN_TO_REG(val);
214 lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]);
215 mutex_unlock(&data->update_lock);
219 static ssize_t set_in_max(struct device *dev, const char *buf,
220 size_t count, int nr)
222 struct i2c_client *client = to_i2c_client(dev);
223 struct lm78_data *data = i2c_get_clientdata(client);
224 unsigned long val = simple_strtoul(buf, NULL, 10);
226 mutex_lock(&data->update_lock);
227 data->in_max[nr] = IN_TO_REG(val);
228 lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]);
229 mutex_unlock(&data->update_lock);
233 #define show_in_offset(offset) \
235 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
237 return show_in(dev, buf, offset); \
239 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
240 show_in##offset, NULL); \
242 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
244 return show_in_min(dev, buf, offset); \
247 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
249 return show_in_max(dev, buf, offset); \
251 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
252 const char *buf, size_t count) \
254 return set_in_min(dev, buf, count, offset); \
256 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
257 const char *buf, size_t count) \
259 return set_in_max(dev, buf, count, offset); \
261 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
262 show_in##offset##_min, set_in##offset##_min); \
263 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
264 show_in##offset##_max, set_in##offset##_max);
275 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
277 struct lm78_data *data = lm78_update_device(dev);
278 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
281 static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, char *buf)
283 struct lm78_data *data = lm78_update_device(dev);
284 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
287 static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
289 struct i2c_client *client = to_i2c_client(dev);
290 struct lm78_data *data = i2c_get_clientdata(client);
291 long val = simple_strtol(buf, NULL, 10);
293 mutex_lock(&data->update_lock);
294 data->temp_over = TEMP_TO_REG(val);
295 lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over);
296 mutex_unlock(&data->update_lock);
300 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf)
302 struct lm78_data *data = lm78_update_device(dev);
303 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
306 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
308 struct i2c_client *client = to_i2c_client(dev);
309 struct lm78_data *data = i2c_get_clientdata(client);
310 long val = simple_strtol(buf, NULL, 10);
312 mutex_lock(&data->update_lock);
313 data->temp_hyst = TEMP_TO_REG(val);
314 lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst);
315 mutex_unlock(&data->update_lock);
319 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
320 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
321 show_temp_over, set_temp_over);
322 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
323 show_temp_hyst, set_temp_hyst);
326 static ssize_t show_fan(struct device *dev, char *buf, int nr)
328 struct lm78_data *data = lm78_update_device(dev);
329 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
330 DIV_FROM_REG(data->fan_div[nr])) );
333 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
335 struct lm78_data *data = lm78_update_device(dev);
336 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr],
337 DIV_FROM_REG(data->fan_div[nr])) );
340 static ssize_t set_fan_min(struct device *dev, const char *buf,
341 size_t count, int nr)
343 struct i2c_client *client = to_i2c_client(dev);
344 struct lm78_data *data = i2c_get_clientdata(client);
345 unsigned long val = simple_strtoul(buf, NULL, 10);
347 mutex_lock(&data->update_lock);
348 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
349 lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
350 mutex_unlock(&data->update_lock);
354 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
356 struct lm78_data *data = lm78_update_device(dev);
357 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
360 /* Note: we save and restore the fan minimum here, because its value is
361 determined in part by the fan divisor. This follows the principle of
362 least surprise; the user doesn't expect the fan minimum to change just
363 because the divisor changed. */
364 static ssize_t set_fan_div(struct device *dev, const char *buf,
365 size_t count, int nr)
367 struct i2c_client *client = to_i2c_client(dev);
368 struct lm78_data *data = i2c_get_clientdata(client);
369 unsigned long val = simple_strtoul(buf, NULL, 10);
373 mutex_lock(&data->update_lock);
374 min = FAN_FROM_REG(data->fan_min[nr],
375 DIV_FROM_REG(data->fan_div[nr]));
378 case 1: data->fan_div[nr] = 0; break;
379 case 2: data->fan_div[nr] = 1; break;
380 case 4: data->fan_div[nr] = 2; break;
381 case 8: data->fan_div[nr] = 3; break;
383 dev_err(&client->dev, "fan_div value %ld not "
384 "supported. Choose one of 1, 2, 4 or 8!\n", val);
385 mutex_unlock(&data->update_lock);
389 reg = lm78_read_value(client, LM78_REG_VID_FANDIV);
392 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
395 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
398 lm78_write_value(client, LM78_REG_VID_FANDIV, reg);
401 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
402 lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
403 mutex_unlock(&data->update_lock);
408 #define show_fan_offset(offset) \
409 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
411 return show_fan(dev, buf, offset - 1); \
413 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
415 return show_fan_min(dev, buf, offset - 1); \
417 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
419 return show_fan_div(dev, buf, offset - 1); \
421 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
422 const char *buf, size_t count) \
424 return set_fan_min(dev, buf, count, offset - 1); \
426 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
427 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
428 show_fan_##offset##_min, set_fan_##offset##_min);
430 static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf,
433 return set_fan_div(dev, buf, count, 0) ;
436 static ssize_t set_fan_2_div(struct device *dev, struct device_attribute *attr, const char *buf,
439 return set_fan_div(dev, buf, count, 1) ;
446 /* Fan 3 divisor is locked in H/W */
447 static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
448 show_fan_1_div, set_fan_1_div);
449 static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
450 show_fan_2_div, set_fan_2_div);
451 static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL);
454 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
456 struct lm78_data *data = lm78_update_device(dev);
457 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
459 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
462 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
464 struct lm78_data *data = lm78_update_device(dev);
465 return sprintf(buf, "%u\n", data->alarms);
467 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
469 /* This function is called when:
470 * lm78_driver is inserted (when this module is loaded), for each
472 * when a new adapter is inserted (and lm78_driver is still present) */
473 static int lm78_attach_adapter(struct i2c_adapter *adapter)
475 if (!(adapter->class & I2C_CLASS_HWMON))
477 return i2c_probe(adapter, &addr_data, lm78_detect);
480 static int lm78_isa_attach_adapter(struct i2c_adapter *adapter)
482 return lm78_detect(adapter, isa_address, -1);
485 /* This function is called by i2c_probe */
486 static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
489 struct i2c_client *new_client;
490 struct lm78_data *data;
491 const char *client_name = "";
492 int is_isa = i2c_is_isa_adapter(adapter);
495 !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
500 /* Reserve the ISA region */
502 if (!request_region(address, LM78_EXTENT,
503 lm78_isa_driver.driver.name)) {
508 /* Probe whether there is anything available on this address. Already
509 done for SMBus clients */
513 #define REALLY_SLOW_IO
514 /* We need the timeouts for at least some LM78-like
515 chips. But only if we read 'undefined' registers. */
516 i = inb_p(address + 1);
517 if (inb_p(address + 2) != i) {
521 if (inb_p(address + 3) != i) {
525 if (inb_p(address + 7) != i) {
529 #undef REALLY_SLOW_IO
531 /* Let's just hope nothing breaks here */
532 i = inb_p(address + 5) & 0x7f;
533 outb_p(~i & 0x7f, address + 5);
534 if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
535 outb_p(i, address + 5);
542 /* OK. For now, we presume we have a valid client. We now create the
543 client structure, even though we cannot fill it completely yet.
544 But it allows us to access lm78_{read,write}_value. */
546 if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
551 new_client = &data->client;
553 mutex_init(&data->lock);
554 i2c_set_clientdata(new_client, data);
555 new_client->addr = address;
556 new_client->adapter = adapter;
557 new_client->driver = is_isa ? &lm78_isa_driver : &lm78_driver;
558 new_client->flags = 0;
560 /* Now, we do the remaining detection. */
562 if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) {
566 if (!is_isa && (lm78_read_value(
567 new_client, LM78_REG_I2C_ADDR) != address)) {
573 /* Determine the chip type. */
575 i = lm78_read_value(new_client, LM78_REG_CHIPID);
576 if (i == 0x00 || i == 0x20 /* LM78 */
577 || i == 0x40) /* LM78-J */
579 else if ((i & 0xfe) == 0xc0)
583 dev_warn(&adapter->dev, "Ignoring 'force' "
584 "parameter for unknown chip at "
585 "adapter %d, address 0x%02x\n",
586 i2c_adapter_id(adapter), address);
593 client_name = "lm78";
594 } else if (kind == lm79) {
595 client_name = "lm79";
598 /* Fill in the remaining client fields and put into the global list */
599 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
603 mutex_init(&data->update_lock);
605 /* Tell the I2C layer a new client has arrived */
606 if ((err = i2c_attach_client(new_client)))
609 /* Initialize the LM78 chip */
610 lm78_init_client(new_client);
612 /* A few vars need to be filled upon startup */
613 for (i = 0; i < 3; i++) {
614 data->fan_min[i] = lm78_read_value(new_client,
615 LM78_REG_FAN_MIN(i));
618 /* Register sysfs hooks */
619 data->class_dev = hwmon_device_register(&new_client->dev);
620 if (IS_ERR(data->class_dev)) {
621 err = PTR_ERR(data->class_dev);
625 device_create_file(&new_client->dev, &dev_attr_in0_input);
626 device_create_file(&new_client->dev, &dev_attr_in0_min);
627 device_create_file(&new_client->dev, &dev_attr_in0_max);
628 device_create_file(&new_client->dev, &dev_attr_in1_input);
629 device_create_file(&new_client->dev, &dev_attr_in1_min);
630 device_create_file(&new_client->dev, &dev_attr_in1_max);
631 device_create_file(&new_client->dev, &dev_attr_in2_input);
632 device_create_file(&new_client->dev, &dev_attr_in2_min);
633 device_create_file(&new_client->dev, &dev_attr_in2_max);
634 device_create_file(&new_client->dev, &dev_attr_in3_input);
635 device_create_file(&new_client->dev, &dev_attr_in3_min);
636 device_create_file(&new_client->dev, &dev_attr_in3_max);
637 device_create_file(&new_client->dev, &dev_attr_in4_input);
638 device_create_file(&new_client->dev, &dev_attr_in4_min);
639 device_create_file(&new_client->dev, &dev_attr_in4_max);
640 device_create_file(&new_client->dev, &dev_attr_in5_input);
641 device_create_file(&new_client->dev, &dev_attr_in5_min);
642 device_create_file(&new_client->dev, &dev_attr_in5_max);
643 device_create_file(&new_client->dev, &dev_attr_in6_input);
644 device_create_file(&new_client->dev, &dev_attr_in6_min);
645 device_create_file(&new_client->dev, &dev_attr_in6_max);
646 device_create_file(&new_client->dev, &dev_attr_temp1_input);
647 device_create_file(&new_client->dev, &dev_attr_temp1_max);
648 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
649 device_create_file(&new_client->dev, &dev_attr_fan1_input);
650 device_create_file(&new_client->dev, &dev_attr_fan1_min);
651 device_create_file(&new_client->dev, &dev_attr_fan1_div);
652 device_create_file(&new_client->dev, &dev_attr_fan2_input);
653 device_create_file(&new_client->dev, &dev_attr_fan2_min);
654 device_create_file(&new_client->dev, &dev_attr_fan2_div);
655 device_create_file(&new_client->dev, &dev_attr_fan3_input);
656 device_create_file(&new_client->dev, &dev_attr_fan3_min);
657 device_create_file(&new_client->dev, &dev_attr_fan3_div);
658 device_create_file(&new_client->dev, &dev_attr_alarms);
659 device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
664 i2c_detach_client(new_client);
669 release_region(address, LM78_EXTENT);
674 static int lm78_detach_client(struct i2c_client *client)
676 struct lm78_data *data = i2c_get_clientdata(client);
679 hwmon_device_unregister(data->class_dev);
681 if ((err = i2c_detach_client(client)))
684 if(i2c_is_isa_client(client))
685 release_region(client->addr, LM78_EXTENT);
692 /* The SMBus locks itself, but ISA access must be locked explicitly!
693 We don't want to lock the whole ISA bus, so we lock each client
695 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
696 would slow down the LM78 access and should not be necessary. */
697 static int lm78_read_value(struct i2c_client *client, u8 reg)
700 if (i2c_is_isa_client(client)) {
701 struct lm78_data *data = i2c_get_clientdata(client);
702 mutex_lock(&data->lock);
703 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
704 res = inb_p(client->addr + LM78_DATA_REG_OFFSET);
705 mutex_unlock(&data->lock);
708 return i2c_smbus_read_byte_data(client, reg);
711 /* The SMBus locks itself, but ISA access muse be locked explicitly!
712 We don't want to lock the whole ISA bus, so we lock each client
714 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
715 would slow down the LM78 access and should not be necessary.
716 There are some ugly typecasts here, but the good new is - they should
717 nowhere else be necessary! */
718 static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
720 if (i2c_is_isa_client(client)) {
721 struct lm78_data *data = i2c_get_clientdata(client);
722 mutex_lock(&data->lock);
723 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
724 outb_p(value, client->addr + LM78_DATA_REG_OFFSET);
725 mutex_unlock(&data->lock);
728 return i2c_smbus_write_byte_data(client, reg, value);
731 static void lm78_init_client(struct i2c_client *client)
733 u8 config = lm78_read_value(client, LM78_REG_CONFIG);
735 /* Start monitoring */
736 if (!(config & 0x01))
737 lm78_write_value(client, LM78_REG_CONFIG,
738 (config & 0xf7) | 0x01);
741 static struct lm78_data *lm78_update_device(struct device *dev)
743 struct i2c_client *client = to_i2c_client(dev);
744 struct lm78_data *data = i2c_get_clientdata(client);
747 mutex_lock(&data->update_lock);
749 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
752 dev_dbg(&client->dev, "Starting lm78 update\n");
754 for (i = 0; i <= 6; i++) {
756 lm78_read_value(client, LM78_REG_IN(i));
758 lm78_read_value(client, LM78_REG_IN_MIN(i));
760 lm78_read_value(client, LM78_REG_IN_MAX(i));
762 for (i = 0; i < 3; i++) {
764 lm78_read_value(client, LM78_REG_FAN(i));
766 lm78_read_value(client, LM78_REG_FAN_MIN(i));
768 data->temp = lm78_read_value(client, LM78_REG_TEMP);
770 lm78_read_value(client, LM78_REG_TEMP_OVER);
772 lm78_read_value(client, LM78_REG_TEMP_HYST);
773 i = lm78_read_value(client, LM78_REG_VID_FANDIV);
774 data->vid = i & 0x0f;
775 if (data->type == lm79)
777 (lm78_read_value(client, LM78_REG_CHIPID) &
781 data->fan_div[0] = (i >> 4) & 0x03;
782 data->fan_div[1] = i >> 6;
783 data->alarms = lm78_read_value(client, LM78_REG_ALARM1) +
784 (lm78_read_value(client, LM78_REG_ALARM2) << 8);
785 data->last_updated = jiffies;
788 data->fan_div[2] = 1;
791 mutex_unlock(&data->update_lock);
796 static int __init sm_lm78_init(void)
800 res = i2c_add_driver(&lm78_driver);
804 res = i2c_isa_add_driver(&lm78_isa_driver);
806 i2c_del_driver(&lm78_driver);
813 static void __exit sm_lm78_exit(void)
815 i2c_isa_del_driver(&lm78_isa_driver);
816 i2c_del_driver(&lm78_driver);
821 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
822 MODULE_DESCRIPTION("LM78/LM79 driver");
823 MODULE_LICENSE("GPL");
825 module_init(sm_lm78_init);
826 module_exit(sm_lm78_exit);