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/config.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/i2c.h>
27 #include <linux/i2c-sensor.h>
30 /* Addresses to scan */
31 static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
32 0x25, 0x26, 0x27, 0x28, 0x29,
33 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
34 0x2f, I2C_CLIENT_END };
35 static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END };
37 /* Insmod parameters */
38 SENSORS_INSMOD_3(lm78, lm78j, lm79);
40 /* Many LM78 constants specified below */
42 /* Length of ISA address segment */
45 /* Where are the ISA address/data registers relative to the base address */
46 #define LM78_ADDR_REG_OFFSET 5
47 #define LM78_DATA_REG_OFFSET 6
49 /* The LM78 registers */
50 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
51 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
52 #define LM78_REG_IN(nr) (0x20 + (nr))
54 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
55 #define LM78_REG_FAN(nr) (0x28 + (nr))
57 #define LM78_REG_TEMP 0x27
58 #define LM78_REG_TEMP_OVER 0x39
59 #define LM78_REG_TEMP_HYST 0x3a
61 #define LM78_REG_ALARM1 0x41
62 #define LM78_REG_ALARM2 0x42
64 #define LM78_REG_VID_FANDIV 0x47
66 #define LM78_REG_CONFIG 0x40
67 #define LM78_REG_CHIPID 0x49
68 #define LM78_REG_I2C_ADDR 0x48
71 /* Conversions. Rounding and limit checking is only done on the TO_REG
74 /* IN: mV, (0V to 4.08V)
76 static inline u8 IN_TO_REG(unsigned long val)
78 unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
79 return (nval + 8) / 16;
81 #define IN_FROM_REG(val) ((val) * 16)
83 static inline u8 FAN_TO_REG(long rpm, int div)
87 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
90 static inline int FAN_FROM_REG(u8 val, int div)
92 return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
95 /* TEMP: mC (-128C to +127C)
96 REG: 1C/bit, two's complement */
97 static inline s8 TEMP_TO_REG(int val)
99 int nval = SENSORS_LIMIT(val, -128000, 127000) ;
100 return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
103 static inline int TEMP_FROM_REG(s8 val)
109 REG: (see doc/vid) */
110 static inline int VID_FROM_REG(u8 val)
112 return val==0x1f ? 0 : val>=0x10 ? 5100-val*100 : 2050-val*50;
115 #define DIV_FROM_REG(val) (1 << (val))
117 /* There are some complications in a module like this. First off, LM78 chips
118 may be both present on the SMBus and the ISA bus, and we have to handle
119 those cases separately at some places. Second, there might be several
120 LM78 chips available (well, actually, that is probably never done; but
121 it is a clean illustration of how to handle a case like that). Finally,
122 a specific chip may be attached to *both* ISA and SMBus, and we would
123 not like to detect it double. Fortunately, in the case of the LM78 at
124 least, a register tells us what SMBus address we are on, so that helps
125 a bit - except if there could be more than one SMBus. Groan. No solution
128 /* This module may seem overly long and complicated. In fact, it is not so
129 bad. Quite a lot of bookkeeping is done. A real driver can often cut
132 /* For each registered LM78, we need to keep some data in memory. That
133 data is pointed to by lm78_list[NR]->data. The structure itself is
134 dynamically allocated, at the same time when a new lm78 client is
137 struct i2c_client client;
138 struct semaphore lock;
141 struct semaphore update_lock;
142 char valid; /* !=0 if following fields are valid */
143 unsigned long last_updated; /* In jiffies */
145 u8 in[7]; /* Register value */
146 u8 in_max[7]; /* Register value */
147 u8 in_min[7]; /* Register value */
148 u8 fan[3]; /* Register value */
149 u8 fan_min[3]; /* Register value */
150 s8 temp; /* Register value */
151 s8 temp_over; /* Register value */
152 s8 temp_hyst; /* Register value */
153 u8 fan_div[3]; /* Register encoding, shifted right */
154 u8 vid; /* Register encoding, combined */
155 u16 alarms; /* Register encoding, combined */
159 static int lm78_attach_adapter(struct i2c_adapter *adapter);
160 static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
161 static int lm78_detach_client(struct i2c_client *client);
163 static int lm78_read_value(struct i2c_client *client, u8 register);
164 static int lm78_write_value(struct i2c_client *client, u8 register, u8 value);
165 static struct lm78_data *lm78_update_device(struct device *dev);
166 static void lm78_init_client(struct i2c_client *client);
169 static struct i2c_driver lm78_driver = {
170 .owner = THIS_MODULE,
172 .id = I2C_DRIVERID_LM78,
173 .flags = I2C_DF_NOTIFY,
174 .attach_adapter = lm78_attach_adapter,
175 .detach_client = lm78_detach_client,
179 static ssize_t show_in(struct device *dev, char *buf, int nr)
181 struct lm78_data *data = lm78_update_device(dev);
182 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
185 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
187 struct lm78_data *data = lm78_update_device(dev);
188 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
191 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
193 struct lm78_data *data = lm78_update_device(dev);
194 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
197 static ssize_t set_in_min(struct device *dev, const char *buf,
198 size_t count, int nr)
200 struct i2c_client *client = to_i2c_client(dev);
201 struct lm78_data *data = i2c_get_clientdata(client);
202 unsigned long val = simple_strtoul(buf, NULL, 10);
204 down(&data->update_lock);
205 data->in_min[nr] = IN_TO_REG(val);
206 lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]);
207 up(&data->update_lock);
211 static ssize_t set_in_max(struct device *dev, const char *buf,
212 size_t count, int nr)
214 struct i2c_client *client = to_i2c_client(dev);
215 struct lm78_data *data = i2c_get_clientdata(client);
216 unsigned long val = simple_strtoul(buf, NULL, 10);
218 down(&data->update_lock);
219 data->in_max[nr] = IN_TO_REG(val);
220 lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]);
221 up(&data->update_lock);
225 #define show_in_offset(offset) \
227 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
229 return show_in(dev, buf, offset); \
231 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
232 show_in##offset, NULL); \
234 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
236 return show_in_min(dev, buf, offset); \
239 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
241 return show_in_max(dev, buf, offset); \
243 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
244 const char *buf, size_t count) \
246 return set_in_min(dev, buf, count, offset); \
248 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
249 const char *buf, size_t count) \
251 return set_in_max(dev, buf, count, offset); \
253 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
254 show_in##offset##_min, set_in##offset##_min); \
255 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
256 show_in##offset##_max, set_in##offset##_max);
267 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
269 struct lm78_data *data = lm78_update_device(dev);
270 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
273 static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, char *buf)
275 struct lm78_data *data = lm78_update_device(dev);
276 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
279 static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
281 struct i2c_client *client = to_i2c_client(dev);
282 struct lm78_data *data = i2c_get_clientdata(client);
283 long val = simple_strtol(buf, NULL, 10);
285 down(&data->update_lock);
286 data->temp_over = TEMP_TO_REG(val);
287 lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over);
288 up(&data->update_lock);
292 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf)
294 struct lm78_data *data = lm78_update_device(dev);
295 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
298 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
300 struct i2c_client *client = to_i2c_client(dev);
301 struct lm78_data *data = i2c_get_clientdata(client);
302 long val = simple_strtol(buf, NULL, 10);
304 down(&data->update_lock);
305 data->temp_hyst = TEMP_TO_REG(val);
306 lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst);
307 up(&data->update_lock);
311 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
312 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
313 show_temp_over, set_temp_over);
314 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
315 show_temp_hyst, set_temp_hyst);
318 static ssize_t show_fan(struct device *dev, char *buf, int nr)
320 struct lm78_data *data = lm78_update_device(dev);
321 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
322 DIV_FROM_REG(data->fan_div[nr])) );
325 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
327 struct lm78_data *data = lm78_update_device(dev);
328 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr],
329 DIV_FROM_REG(data->fan_div[nr])) );
332 static ssize_t set_fan_min(struct device *dev, const char *buf,
333 size_t count, int nr)
335 struct i2c_client *client = to_i2c_client(dev);
336 struct lm78_data *data = i2c_get_clientdata(client);
337 unsigned long val = simple_strtoul(buf, NULL, 10);
339 down(&data->update_lock);
340 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
341 lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
342 up(&data->update_lock);
346 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
348 struct lm78_data *data = lm78_update_device(dev);
349 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
352 /* Note: we save and restore the fan minimum here, because its value is
353 determined in part by the fan divisor. This follows the principle of
354 least suprise; the user doesn't expect the fan minimum to change just
355 because the divisor changed. */
356 static ssize_t set_fan_div(struct device *dev, const char *buf,
357 size_t count, int nr)
359 struct i2c_client *client = to_i2c_client(dev);
360 struct lm78_data *data = i2c_get_clientdata(client);
361 unsigned long val = simple_strtoul(buf, NULL, 10);
365 down(&data->update_lock);
366 min = FAN_FROM_REG(data->fan_min[nr],
367 DIV_FROM_REG(data->fan_div[nr]));
370 case 1: data->fan_div[nr] = 0; break;
371 case 2: data->fan_div[nr] = 1; break;
372 case 4: data->fan_div[nr] = 2; break;
373 case 8: data->fan_div[nr] = 3; break;
375 dev_err(&client->dev, "fan_div value %ld not "
376 "supported. Choose one of 1, 2, 4 or 8!\n", val);
377 up(&data->update_lock);
381 reg = lm78_read_value(client, LM78_REG_VID_FANDIV);
384 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
387 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
390 lm78_write_value(client, LM78_REG_VID_FANDIV, reg);
393 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
394 lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
395 up(&data->update_lock);
400 #define show_fan_offset(offset) \
401 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
403 return show_fan(dev, buf, offset - 1); \
405 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
407 return show_fan_min(dev, buf, offset - 1); \
409 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
411 return show_fan_div(dev, buf, offset - 1); \
413 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
414 const char *buf, size_t count) \
416 return set_fan_min(dev, buf, count, offset - 1); \
418 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
419 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
420 show_fan_##offset##_min, set_fan_##offset##_min);
422 static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf,
425 return set_fan_div(dev, buf, count, 0) ;
428 static ssize_t set_fan_2_div(struct device *dev, struct device_attribute *attr, const char *buf,
431 return set_fan_div(dev, buf, count, 1) ;
438 /* Fan 3 divisor is locked in H/W */
439 static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
440 show_fan_1_div, set_fan_1_div);
441 static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
442 show_fan_2_div, set_fan_2_div);
443 static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL);
446 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
448 struct lm78_data *data = lm78_update_device(dev);
449 return sprintf(buf, "%d\n", VID_FROM_REG(data->vid));
451 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
454 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
456 struct lm78_data *data = lm78_update_device(dev);
457 return sprintf(buf, "%u\n", data->alarms);
459 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
461 /* This function is called when:
462 * lm78_driver is inserted (when this module is loaded), for each
464 * when a new adapter is inserted (and lm78_driver is still present) */
465 static int lm78_attach_adapter(struct i2c_adapter *adapter)
467 if (!(adapter->class & I2C_CLASS_HWMON))
469 return i2c_detect(adapter, &addr_data, lm78_detect);
472 /* This function is called by i2c_detect */
473 int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
476 struct i2c_client *new_client;
477 struct lm78_data *data;
478 const char *client_name = "";
479 int is_isa = i2c_is_isa_adapter(adapter);
482 !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
487 /* Reserve the ISA region */
489 if (!request_region(address, LM78_EXTENT, lm78_driver.name)) {
494 /* Probe whether there is anything available on this address. Already
495 done for SMBus clients */
499 #define REALLY_SLOW_IO
500 /* We need the timeouts for at least some LM78-like
501 chips. But only if we read 'undefined' registers. */
502 i = inb_p(address + 1);
503 if (inb_p(address + 2) != i) {
507 if (inb_p(address + 3) != i) {
511 if (inb_p(address + 7) != i) {
515 #undef REALLY_SLOW_IO
517 /* Let's just hope nothing breaks here */
518 i = inb_p(address + 5) & 0x7f;
519 outb_p(~i & 0x7f, address + 5);
520 if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
521 outb_p(i, address + 5);
528 /* OK. For now, we presume we have a valid client. We now create the
529 client structure, even though we cannot fill it completely yet.
530 But it allows us to access lm78_{read,write}_value. */
532 if (!(data = kmalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
536 memset(data, 0, sizeof(struct lm78_data));
538 new_client = &data->client;
540 init_MUTEX(&data->lock);
541 i2c_set_clientdata(new_client, data);
542 new_client->addr = address;
543 new_client->adapter = adapter;
544 new_client->driver = &lm78_driver;
545 new_client->flags = 0;
547 /* Now, we do the remaining detection. */
549 if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) {
553 if (!is_isa && (lm78_read_value(
554 new_client, LM78_REG_I2C_ADDR) != address)) {
560 /* Determine the chip type. */
562 i = lm78_read_value(new_client, LM78_REG_CHIPID);
563 if (i == 0x00 || i == 0x20)
567 else if ((i & 0xfe) == 0xc0)
571 dev_warn(&adapter->dev, "Ignoring 'force' "
572 "parameter for unknown chip at "
573 "adapter %d, address 0x%02x\n",
574 i2c_adapter_id(adapter), address);
581 client_name = "lm78";
582 } else if (kind == lm78j) {
583 client_name = "lm78-j";
584 } else if (kind == lm79) {
585 client_name = "lm79";
588 /* Fill in the remaining client fields and put into the global list */
589 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
593 init_MUTEX(&data->update_lock);
595 /* Tell the I2C layer a new client has arrived */
596 if ((err = i2c_attach_client(new_client)))
599 /* Initialize the LM78 chip */
600 lm78_init_client(new_client);
602 /* A few vars need to be filled upon startup */
603 for (i = 0; i < 3; i++) {
604 data->fan_min[i] = lm78_read_value(new_client,
605 LM78_REG_FAN_MIN(i));
608 /* Register sysfs hooks */
609 device_create_file(&new_client->dev, &dev_attr_in0_input);
610 device_create_file(&new_client->dev, &dev_attr_in0_min);
611 device_create_file(&new_client->dev, &dev_attr_in0_max);
612 device_create_file(&new_client->dev, &dev_attr_in1_input);
613 device_create_file(&new_client->dev, &dev_attr_in1_min);
614 device_create_file(&new_client->dev, &dev_attr_in1_max);
615 device_create_file(&new_client->dev, &dev_attr_in2_input);
616 device_create_file(&new_client->dev, &dev_attr_in2_min);
617 device_create_file(&new_client->dev, &dev_attr_in2_max);
618 device_create_file(&new_client->dev, &dev_attr_in3_input);
619 device_create_file(&new_client->dev, &dev_attr_in3_min);
620 device_create_file(&new_client->dev, &dev_attr_in3_max);
621 device_create_file(&new_client->dev, &dev_attr_in4_input);
622 device_create_file(&new_client->dev, &dev_attr_in4_min);
623 device_create_file(&new_client->dev, &dev_attr_in4_max);
624 device_create_file(&new_client->dev, &dev_attr_in5_input);
625 device_create_file(&new_client->dev, &dev_attr_in5_min);
626 device_create_file(&new_client->dev, &dev_attr_in5_max);
627 device_create_file(&new_client->dev, &dev_attr_in6_input);
628 device_create_file(&new_client->dev, &dev_attr_in6_min);
629 device_create_file(&new_client->dev, &dev_attr_in6_max);
630 device_create_file(&new_client->dev, &dev_attr_temp1_input);
631 device_create_file(&new_client->dev, &dev_attr_temp1_max);
632 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
633 device_create_file(&new_client->dev, &dev_attr_fan1_input);
634 device_create_file(&new_client->dev, &dev_attr_fan1_min);
635 device_create_file(&new_client->dev, &dev_attr_fan1_div);
636 device_create_file(&new_client->dev, &dev_attr_fan2_input);
637 device_create_file(&new_client->dev, &dev_attr_fan2_min);
638 device_create_file(&new_client->dev, &dev_attr_fan2_div);
639 device_create_file(&new_client->dev, &dev_attr_fan3_input);
640 device_create_file(&new_client->dev, &dev_attr_fan3_min);
641 device_create_file(&new_client->dev, &dev_attr_fan3_div);
642 device_create_file(&new_client->dev, &dev_attr_alarms);
643 device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
651 release_region(address, LM78_EXTENT);
656 static int lm78_detach_client(struct i2c_client *client)
660 if ((err = i2c_detach_client(client))) {
661 dev_err(&client->dev,
662 "Client deregistration failed, client not detached.\n");
666 if(i2c_is_isa_client(client))
667 release_region(client->addr, LM78_EXTENT);
669 kfree(i2c_get_clientdata(client));
674 /* The SMBus locks itself, but ISA access must be locked explicitely!
675 We don't want to lock the whole ISA bus, so we lock each client
677 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
678 would slow down the LM78 access and should not be necessary. */
679 static int lm78_read_value(struct i2c_client *client, u8 reg)
682 if (i2c_is_isa_client(client)) {
683 struct lm78_data *data = i2c_get_clientdata(client);
685 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
686 res = inb_p(client->addr + LM78_DATA_REG_OFFSET);
690 return i2c_smbus_read_byte_data(client, reg);
693 /* The SMBus locks itself, but ISA access muse be locked explicitely!
694 We don't want to lock the whole ISA bus, so we lock each client
696 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
697 would slow down the LM78 access and should not be necessary.
698 There are some ugly typecasts here, but the good new is - they should
699 nowhere else be necessary! */
700 static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
702 if (i2c_is_isa_client(client)) {
703 struct lm78_data *data = i2c_get_clientdata(client);
705 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
706 outb_p(value, client->addr + LM78_DATA_REG_OFFSET);
710 return i2c_smbus_write_byte_data(client, reg, value);
713 /* Called when we have found a new LM78. It should set limits, etc. */
714 static void lm78_init_client(struct i2c_client *client)
716 u8 config = lm78_read_value(client, LM78_REG_CONFIG);
718 /* Start monitoring */
719 if (!(config & 0x01))
720 lm78_write_value(client, LM78_REG_CONFIG,
721 (config & 0xf7) | 0x01);
724 static struct lm78_data *lm78_update_device(struct device *dev)
726 struct i2c_client *client = to_i2c_client(dev);
727 struct lm78_data *data = i2c_get_clientdata(client);
730 down(&data->update_lock);
732 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
735 dev_dbg(&client->dev, "Starting lm78 update\n");
737 for (i = 0; i <= 6; i++) {
739 lm78_read_value(client, LM78_REG_IN(i));
741 lm78_read_value(client, LM78_REG_IN_MIN(i));
743 lm78_read_value(client, LM78_REG_IN_MAX(i));
745 for (i = 0; i < 3; i++) {
747 lm78_read_value(client, LM78_REG_FAN(i));
749 lm78_read_value(client, LM78_REG_FAN_MIN(i));
751 data->temp = lm78_read_value(client, LM78_REG_TEMP);
753 lm78_read_value(client, LM78_REG_TEMP_OVER);
755 lm78_read_value(client, LM78_REG_TEMP_HYST);
756 i = lm78_read_value(client, LM78_REG_VID_FANDIV);
757 data->vid = i & 0x0f;
758 if (data->type == lm79)
760 (lm78_read_value(client, LM78_REG_CHIPID) &
764 data->fan_div[0] = (i >> 4) & 0x03;
765 data->fan_div[1] = i >> 6;
766 data->alarms = lm78_read_value(client, LM78_REG_ALARM1) +
767 (lm78_read_value(client, LM78_REG_ALARM2) << 8);
768 data->last_updated = jiffies;
771 data->fan_div[2] = 1;
774 up(&data->update_lock);
779 static int __init sm_lm78_init(void)
781 return i2c_add_driver(&lm78_driver);
784 static void __exit sm_lm78_exit(void)
786 i2c_del_driver(&lm78_driver);
791 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
792 MODULE_DESCRIPTION("LM78, LM78-J and LM79 driver");
793 MODULE_LICENSE("GPL");
795 module_init(sm_lm78_init);
796 module_exit(sm_lm78_exit);