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-sensor.h>
27 #include <linux/hwmon.h>
28 #include <linux/err.h>
31 /* Addresses to scan */
32 static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
33 0x25, 0x26, 0x27, 0x28, 0x29,
34 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
35 0x2f, I2C_CLIENT_END };
36 static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END };
38 /* Insmod parameters */
39 SENSORS_INSMOD_2(lm78, lm79);
41 /* Many LM78 constants specified below */
43 /* Length of ISA address segment */
46 /* Where are the ISA address/data registers relative to the base address */
47 #define LM78_ADDR_REG_OFFSET 5
48 #define LM78_DATA_REG_OFFSET 6
50 /* The LM78 registers */
51 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
52 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
53 #define LM78_REG_IN(nr) (0x20 + (nr))
55 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
56 #define LM78_REG_FAN(nr) (0x28 + (nr))
58 #define LM78_REG_TEMP 0x27
59 #define LM78_REG_TEMP_OVER 0x39
60 #define LM78_REG_TEMP_HYST 0x3a
62 #define LM78_REG_ALARM1 0x41
63 #define LM78_REG_ALARM2 0x42
65 #define LM78_REG_VID_FANDIV 0x47
67 #define LM78_REG_CONFIG 0x40
68 #define LM78_REG_CHIPID 0x49
69 #define LM78_REG_I2C_ADDR 0x48
72 /* Conversions. Rounding and limit checking is only done on the TO_REG
75 /* IN: mV, (0V to 4.08V)
77 static inline u8 IN_TO_REG(unsigned long val)
79 unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
80 return (nval + 8) / 16;
82 #define IN_FROM_REG(val) ((val) * 16)
84 static inline u8 FAN_TO_REG(long rpm, int div)
88 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
91 static inline int FAN_FROM_REG(u8 val, int div)
93 return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
96 /* TEMP: mC (-128C to +127C)
97 REG: 1C/bit, two's complement */
98 static inline s8 TEMP_TO_REG(int val)
100 int nval = SENSORS_LIMIT(val, -128000, 127000) ;
101 return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
104 static inline int TEMP_FROM_REG(s8 val)
110 REG: (see doc/vid) */
111 static inline int VID_FROM_REG(u8 val)
113 return val==0x1f ? 0 : val>=0x10 ? 5100-val*100 : 2050-val*50;
116 #define DIV_FROM_REG(val) (1 << (val))
118 /* There are some complications in a module like this. First off, LM78 chips
119 may be both present on the SMBus and the ISA bus, and we have to handle
120 those cases separately at some places. Second, there might be several
121 LM78 chips available (well, actually, that is probably never done; but
122 it is a clean illustration of how to handle a case like that). Finally,
123 a specific chip may be attached to *both* ISA and SMBus, and we would
124 not like to detect it double. Fortunately, in the case of the LM78 at
125 least, a register tells us what SMBus address we are on, so that helps
126 a bit - except if there could be more than one SMBus. Groan. No solution
129 /* This module may seem overly long and complicated. In fact, it is not so
130 bad. Quite a lot of bookkeeping is done. A real driver can often cut
133 /* For each registered LM78, we need to keep some data in memory. That
134 data is pointed to by lm78_list[NR]->data. The structure itself is
135 dynamically allocated, at the same time when a new lm78 client is
138 struct i2c_client client;
139 struct class_device *class_dev;
140 struct semaphore lock;
143 struct semaphore update_lock;
144 char valid; /* !=0 if following fields are valid */
145 unsigned long last_updated; /* In jiffies */
147 u8 in[7]; /* Register value */
148 u8 in_max[7]; /* Register value */
149 u8 in_min[7]; /* Register value */
150 u8 fan[3]; /* Register value */
151 u8 fan_min[3]; /* Register value */
152 s8 temp; /* Register value */
153 s8 temp_over; /* Register value */
154 s8 temp_hyst; /* Register value */
155 u8 fan_div[3]; /* Register encoding, shifted right */
156 u8 vid; /* Register encoding, combined */
157 u16 alarms; /* Register encoding, combined */
161 static int lm78_attach_adapter(struct i2c_adapter *adapter);
162 static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
163 static int lm78_detach_client(struct i2c_client *client);
165 static int lm78_read_value(struct i2c_client *client, u8 register);
166 static int lm78_write_value(struct i2c_client *client, u8 register, u8 value);
167 static struct lm78_data *lm78_update_device(struct device *dev);
168 static void lm78_init_client(struct i2c_client *client);
171 static struct i2c_driver lm78_driver = {
172 .owner = THIS_MODULE,
174 .id = I2C_DRIVERID_LM78,
175 .flags = I2C_DF_NOTIFY,
176 .attach_adapter = lm78_attach_adapter,
177 .detach_client = lm78_detach_client,
181 static ssize_t show_in(struct device *dev, char *buf, int nr)
183 struct lm78_data *data = lm78_update_device(dev);
184 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
187 static ssize_t show_in_min(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_min[nr]));
193 static ssize_t show_in_max(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_max[nr]));
199 static ssize_t set_in_min(struct device *dev, const char *buf,
200 size_t count, int nr)
202 struct i2c_client *client = to_i2c_client(dev);
203 struct lm78_data *data = i2c_get_clientdata(client);
204 unsigned long val = simple_strtoul(buf, NULL, 10);
206 down(&data->update_lock);
207 data->in_min[nr] = IN_TO_REG(val);
208 lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]);
209 up(&data->update_lock);
213 static ssize_t set_in_max(struct device *dev, const char *buf,
214 size_t count, int nr)
216 struct i2c_client *client = to_i2c_client(dev);
217 struct lm78_data *data = i2c_get_clientdata(client);
218 unsigned long val = simple_strtoul(buf, NULL, 10);
220 down(&data->update_lock);
221 data->in_max[nr] = IN_TO_REG(val);
222 lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]);
223 up(&data->update_lock);
227 #define show_in_offset(offset) \
229 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
231 return show_in(dev, buf, offset); \
233 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
234 show_in##offset, NULL); \
236 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
238 return show_in_min(dev, buf, offset); \
241 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
243 return show_in_max(dev, buf, offset); \
245 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
246 const char *buf, size_t count) \
248 return set_in_min(dev, buf, count, offset); \
250 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
251 const char *buf, size_t count) \
253 return set_in_max(dev, buf, count, offset); \
255 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
256 show_in##offset##_min, set_in##offset##_min); \
257 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
258 show_in##offset##_max, set_in##offset##_max);
269 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
271 struct lm78_data *data = lm78_update_device(dev);
272 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
275 static ssize_t show_temp_over(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_over));
281 static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
283 struct i2c_client *client = to_i2c_client(dev);
284 struct lm78_data *data = i2c_get_clientdata(client);
285 long val = simple_strtol(buf, NULL, 10);
287 down(&data->update_lock);
288 data->temp_over = TEMP_TO_REG(val);
289 lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over);
290 up(&data->update_lock);
294 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf)
296 struct lm78_data *data = lm78_update_device(dev);
297 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
300 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
302 struct i2c_client *client = to_i2c_client(dev);
303 struct lm78_data *data = i2c_get_clientdata(client);
304 long val = simple_strtol(buf, NULL, 10);
306 down(&data->update_lock);
307 data->temp_hyst = TEMP_TO_REG(val);
308 lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst);
309 up(&data->update_lock);
313 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
314 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
315 show_temp_over, set_temp_over);
316 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
317 show_temp_hyst, set_temp_hyst);
320 static ssize_t show_fan(struct device *dev, char *buf, int nr)
322 struct lm78_data *data = lm78_update_device(dev);
323 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
324 DIV_FROM_REG(data->fan_div[nr])) );
327 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
329 struct lm78_data *data = lm78_update_device(dev);
330 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr],
331 DIV_FROM_REG(data->fan_div[nr])) );
334 static ssize_t set_fan_min(struct device *dev, const char *buf,
335 size_t count, int nr)
337 struct i2c_client *client = to_i2c_client(dev);
338 struct lm78_data *data = i2c_get_clientdata(client);
339 unsigned long val = simple_strtoul(buf, NULL, 10);
341 down(&data->update_lock);
342 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
343 lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
344 up(&data->update_lock);
348 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
350 struct lm78_data *data = lm78_update_device(dev);
351 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
354 /* Note: we save and restore the fan minimum here, because its value is
355 determined in part by the fan divisor. This follows the principle of
356 least suprise; the user doesn't expect the fan minimum to change just
357 because the divisor changed. */
358 static ssize_t set_fan_div(struct device *dev, const char *buf,
359 size_t count, int nr)
361 struct i2c_client *client = to_i2c_client(dev);
362 struct lm78_data *data = i2c_get_clientdata(client);
363 unsigned long val = simple_strtoul(buf, NULL, 10);
367 down(&data->update_lock);
368 min = FAN_FROM_REG(data->fan_min[nr],
369 DIV_FROM_REG(data->fan_div[nr]));
372 case 1: data->fan_div[nr] = 0; break;
373 case 2: data->fan_div[nr] = 1; break;
374 case 4: data->fan_div[nr] = 2; break;
375 case 8: data->fan_div[nr] = 3; break;
377 dev_err(&client->dev, "fan_div value %ld not "
378 "supported. Choose one of 1, 2, 4 or 8!\n", val);
379 up(&data->update_lock);
383 reg = lm78_read_value(client, LM78_REG_VID_FANDIV);
386 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
389 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
392 lm78_write_value(client, LM78_REG_VID_FANDIV, reg);
395 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
396 lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
397 up(&data->update_lock);
402 #define show_fan_offset(offset) \
403 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
405 return show_fan(dev, buf, offset - 1); \
407 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
409 return show_fan_min(dev, buf, offset - 1); \
411 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
413 return show_fan_div(dev, buf, offset - 1); \
415 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
416 const char *buf, size_t count) \
418 return set_fan_min(dev, buf, count, offset - 1); \
420 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
421 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
422 show_fan_##offset##_min, set_fan_##offset##_min);
424 static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf,
427 return set_fan_div(dev, buf, count, 0) ;
430 static ssize_t set_fan_2_div(struct device *dev, struct device_attribute *attr, const char *buf,
433 return set_fan_div(dev, buf, count, 1) ;
440 /* Fan 3 divisor is locked in H/W */
441 static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
442 show_fan_1_div, set_fan_1_div);
443 static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
444 show_fan_2_div, set_fan_2_div);
445 static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL);
448 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
450 struct lm78_data *data = lm78_update_device(dev);
451 return sprintf(buf, "%d\n", VID_FROM_REG(data->vid));
453 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
456 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
458 struct lm78_data *data = lm78_update_device(dev);
459 return sprintf(buf, "%u\n", data->alarms);
461 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
463 /* This function is called when:
464 * lm78_driver is inserted (when this module is loaded), for each
466 * when a new adapter is inserted (and lm78_driver is still present) */
467 static int lm78_attach_adapter(struct i2c_adapter *adapter)
469 if (!(adapter->class & I2C_CLASS_HWMON))
471 return i2c_detect(adapter, &addr_data, lm78_detect);
474 /* This function is called by i2c_detect */
475 int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
478 struct i2c_client *new_client;
479 struct lm78_data *data;
480 const char *client_name = "";
481 int is_isa = i2c_is_isa_adapter(adapter);
484 !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
489 /* Reserve the ISA region */
491 if (!request_region(address, LM78_EXTENT, lm78_driver.name)) {
496 /* Probe whether there is anything available on this address. Already
497 done for SMBus clients */
501 #define REALLY_SLOW_IO
502 /* We need the timeouts for at least some LM78-like
503 chips. But only if we read 'undefined' registers. */
504 i = inb_p(address + 1);
505 if (inb_p(address + 2) != i) {
509 if (inb_p(address + 3) != i) {
513 if (inb_p(address + 7) != i) {
517 #undef REALLY_SLOW_IO
519 /* Let's just hope nothing breaks here */
520 i = inb_p(address + 5) & 0x7f;
521 outb_p(~i & 0x7f, address + 5);
522 if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
523 outb_p(i, address + 5);
530 /* OK. For now, we presume we have a valid client. We now create the
531 client structure, even though we cannot fill it completely yet.
532 But it allows us to access lm78_{read,write}_value. */
534 if (!(data = kmalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
538 memset(data, 0, sizeof(struct lm78_data));
540 new_client = &data->client;
542 init_MUTEX(&data->lock);
543 i2c_set_clientdata(new_client, data);
544 new_client->addr = address;
545 new_client->adapter = adapter;
546 new_client->driver = &lm78_driver;
547 new_client->flags = 0;
549 /* Now, we do the remaining detection. */
551 if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) {
555 if (!is_isa && (lm78_read_value(
556 new_client, LM78_REG_I2C_ADDR) != address)) {
562 /* Determine the chip type. */
564 i = lm78_read_value(new_client, LM78_REG_CHIPID);
565 if (i == 0x00 || i == 0x20 /* LM78 */
566 || i == 0x40) /* LM78-J */
568 else if ((i & 0xfe) == 0xc0)
572 dev_warn(&adapter->dev, "Ignoring 'force' "
573 "parameter for unknown chip at "
574 "adapter %d, address 0x%02x\n",
575 i2c_adapter_id(adapter), address);
582 client_name = "lm78";
583 } else if (kind == lm79) {
584 client_name = "lm79";
587 /* Fill in the remaining client fields and put into the global list */
588 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
592 init_MUTEX(&data->update_lock);
594 /* Tell the I2C layer a new client has arrived */
595 if ((err = i2c_attach_client(new_client)))
598 /* Initialize the LM78 chip */
599 lm78_init_client(new_client);
601 /* A few vars need to be filled upon startup */
602 for (i = 0; i < 3; i++) {
603 data->fan_min[i] = lm78_read_value(new_client,
604 LM78_REG_FAN_MIN(i));
607 /* Register sysfs hooks */
608 data->class_dev = hwmon_device_register(&new_client->dev);
609 if (IS_ERR(data->class_dev)) {
610 err = PTR_ERR(data->class_dev);
614 device_create_file(&new_client->dev, &dev_attr_in0_input);
615 device_create_file(&new_client->dev, &dev_attr_in0_min);
616 device_create_file(&new_client->dev, &dev_attr_in0_max);
617 device_create_file(&new_client->dev, &dev_attr_in1_input);
618 device_create_file(&new_client->dev, &dev_attr_in1_min);
619 device_create_file(&new_client->dev, &dev_attr_in1_max);
620 device_create_file(&new_client->dev, &dev_attr_in2_input);
621 device_create_file(&new_client->dev, &dev_attr_in2_min);
622 device_create_file(&new_client->dev, &dev_attr_in2_max);
623 device_create_file(&new_client->dev, &dev_attr_in3_input);
624 device_create_file(&new_client->dev, &dev_attr_in3_min);
625 device_create_file(&new_client->dev, &dev_attr_in3_max);
626 device_create_file(&new_client->dev, &dev_attr_in4_input);
627 device_create_file(&new_client->dev, &dev_attr_in4_min);
628 device_create_file(&new_client->dev, &dev_attr_in4_max);
629 device_create_file(&new_client->dev, &dev_attr_in5_input);
630 device_create_file(&new_client->dev, &dev_attr_in5_min);
631 device_create_file(&new_client->dev, &dev_attr_in5_max);
632 device_create_file(&new_client->dev, &dev_attr_in6_input);
633 device_create_file(&new_client->dev, &dev_attr_in6_min);
634 device_create_file(&new_client->dev, &dev_attr_in6_max);
635 device_create_file(&new_client->dev, &dev_attr_temp1_input);
636 device_create_file(&new_client->dev, &dev_attr_temp1_max);
637 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
638 device_create_file(&new_client->dev, &dev_attr_fan1_input);
639 device_create_file(&new_client->dev, &dev_attr_fan1_min);
640 device_create_file(&new_client->dev, &dev_attr_fan1_div);
641 device_create_file(&new_client->dev, &dev_attr_fan2_input);
642 device_create_file(&new_client->dev, &dev_attr_fan2_min);
643 device_create_file(&new_client->dev, &dev_attr_fan2_div);
644 device_create_file(&new_client->dev, &dev_attr_fan3_input);
645 device_create_file(&new_client->dev, &dev_attr_fan3_min);
646 device_create_file(&new_client->dev, &dev_attr_fan3_div);
647 device_create_file(&new_client->dev, &dev_attr_alarms);
648 device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
653 i2c_detach_client(new_client);
658 release_region(address, LM78_EXTENT);
663 static int lm78_detach_client(struct i2c_client *client)
665 struct lm78_data *data = i2c_get_clientdata(client);
668 hwmon_device_unregister(data->class_dev);
670 if ((err = i2c_detach_client(client))) {
671 dev_err(&client->dev,
672 "Client deregistration failed, client not detached.\n");
676 if(i2c_is_isa_client(client))
677 release_region(client->addr, LM78_EXTENT);
684 /* The SMBus locks itself, but ISA access must be locked explicitly!
685 We don't want to lock the whole ISA bus, so we lock each client
687 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
688 would slow down the LM78 access and should not be necessary. */
689 static int lm78_read_value(struct i2c_client *client, u8 reg)
692 if (i2c_is_isa_client(client)) {
693 struct lm78_data *data = i2c_get_clientdata(client);
695 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
696 res = inb_p(client->addr + LM78_DATA_REG_OFFSET);
700 return i2c_smbus_read_byte_data(client, reg);
703 /* The SMBus locks itself, but ISA access muse be locked explicitly!
704 We don't want to lock the whole ISA bus, so we lock each client
706 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
707 would slow down the LM78 access and should not be necessary.
708 There are some ugly typecasts here, but the good new is - they should
709 nowhere else be necessary! */
710 static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
712 if (i2c_is_isa_client(client)) {
713 struct lm78_data *data = i2c_get_clientdata(client);
715 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
716 outb_p(value, client->addr + LM78_DATA_REG_OFFSET);
720 return i2c_smbus_write_byte_data(client, reg, value);
723 /* Called when we have found a new LM78. It should set limits, etc. */
724 static void lm78_init_client(struct i2c_client *client)
726 u8 config = lm78_read_value(client, LM78_REG_CONFIG);
728 /* Start monitoring */
729 if (!(config & 0x01))
730 lm78_write_value(client, LM78_REG_CONFIG,
731 (config & 0xf7) | 0x01);
734 static struct lm78_data *lm78_update_device(struct device *dev)
736 struct i2c_client *client = to_i2c_client(dev);
737 struct lm78_data *data = i2c_get_clientdata(client);
740 down(&data->update_lock);
742 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
745 dev_dbg(&client->dev, "Starting lm78 update\n");
747 for (i = 0; i <= 6; i++) {
749 lm78_read_value(client, LM78_REG_IN(i));
751 lm78_read_value(client, LM78_REG_IN_MIN(i));
753 lm78_read_value(client, LM78_REG_IN_MAX(i));
755 for (i = 0; i < 3; i++) {
757 lm78_read_value(client, LM78_REG_FAN(i));
759 lm78_read_value(client, LM78_REG_FAN_MIN(i));
761 data->temp = lm78_read_value(client, LM78_REG_TEMP);
763 lm78_read_value(client, LM78_REG_TEMP_OVER);
765 lm78_read_value(client, LM78_REG_TEMP_HYST);
766 i = lm78_read_value(client, LM78_REG_VID_FANDIV);
767 data->vid = i & 0x0f;
768 if (data->type == lm79)
770 (lm78_read_value(client, LM78_REG_CHIPID) &
774 data->fan_div[0] = (i >> 4) & 0x03;
775 data->fan_div[1] = i >> 6;
776 data->alarms = lm78_read_value(client, LM78_REG_ALARM1) +
777 (lm78_read_value(client, LM78_REG_ALARM2) << 8);
778 data->last_updated = jiffies;
781 data->fan_div[2] = 1;
784 up(&data->update_lock);
789 static int __init sm_lm78_init(void)
791 return i2c_add_driver(&lm78_driver);
794 static void __exit sm_lm78_exit(void)
796 i2c_del_driver(&lm78_driver);
801 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
802 MODULE_DESCRIPTION("LM78/LM79 driver");
803 MODULE_LICENSE("GPL");
805 module_init(sm_lm78_init);
806 module_exit(sm_lm78_exit);