2 lm78.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
5 Copyright (c) 2007 Jean Delvare <khali@linux-fr.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/platform_device.h>
28 #include <linux/ioport.h>
29 #include <linux/hwmon.h>
30 #include <linux/hwmon-vid.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
36 /* ISA device, if found */
37 static struct platform_device *pdev;
39 /* Addresses to scan */
40 static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
41 0x25, 0x26, 0x27, 0x28, 0x29,
42 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
43 0x2f, I2C_CLIENT_END };
44 static unsigned short isa_address = 0x290;
46 /* Insmod parameters */
47 I2C_CLIENT_INSMOD_2(lm78, lm79);
49 /* Many LM78 constants specified below */
51 /* Length of ISA address segment */
54 /* Where are the ISA address/data registers relative to the base address */
55 #define LM78_ADDR_REG_OFFSET 5
56 #define LM78_DATA_REG_OFFSET 6
58 /* The LM78 registers */
59 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
60 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
61 #define LM78_REG_IN(nr) (0x20 + (nr))
63 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
64 #define LM78_REG_FAN(nr) (0x28 + (nr))
66 #define LM78_REG_TEMP 0x27
67 #define LM78_REG_TEMP_OVER 0x39
68 #define LM78_REG_TEMP_HYST 0x3a
70 #define LM78_REG_ALARM1 0x41
71 #define LM78_REG_ALARM2 0x42
73 #define LM78_REG_VID_FANDIV 0x47
75 #define LM78_REG_CONFIG 0x40
76 #define LM78_REG_CHIPID 0x49
77 #define LM78_REG_I2C_ADDR 0x48
80 /* Conversions. Rounding and limit checking is only done on the TO_REG
83 /* IN: mV, (0V to 4.08V)
85 static inline u8 IN_TO_REG(unsigned long val)
87 unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
88 return (nval + 8) / 16;
90 #define IN_FROM_REG(val) ((val) * 16)
92 static inline u8 FAN_TO_REG(long rpm, int div)
96 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
99 static inline int FAN_FROM_REG(u8 val, int div)
101 return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
104 /* TEMP: mC (-128C to +127C)
105 REG: 1C/bit, two's complement */
106 static inline s8 TEMP_TO_REG(int val)
108 int nval = SENSORS_LIMIT(val, -128000, 127000) ;
109 return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
112 static inline int TEMP_FROM_REG(s8 val)
117 #define DIV_FROM_REG(val) (1 << (val))
119 /* There are some complications in a module like this. First off, LM78 chips
120 may be both present on the SMBus and the ISA bus, and we have to handle
121 those cases separately at some places. Second, there might be several
122 LM78 chips available (well, actually, that is probably never done; but
123 it is a clean illustration of how to handle a case like that). Finally,
124 a specific chip may be attached to *both* ISA and SMBus, and we would
125 not like to detect it double. Fortunately, in the case of the LM78 at
126 least, a register tells us what SMBus address we are on, so that helps
127 a bit - except if there could be more than one SMBus. Groan. No solution
130 /* For ISA chips, we abuse the i2c_client addr and name fields. We also use
131 the driver field to differentiate between I2C and ISA chips. */
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_detect(struct i2c_adapter *adapter, int address, int kind);
158 static int lm78_detach_client(struct i2c_client *client);
160 static int __devinit lm78_isa_probe(struct platform_device *pdev);
161 static int __devexit lm78_isa_remove(struct platform_device *pdev);
163 static int lm78_read_value(struct lm78_data *data, u8 reg);
164 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
165 static struct lm78_data *lm78_update_device(struct device *dev);
166 static void lm78_init_device(struct lm78_data *data);
169 static struct i2c_driver lm78_driver = {
173 .id = I2C_DRIVERID_LM78,
174 .attach_adapter = lm78_attach_adapter,
175 .detach_client = lm78_detach_client,
178 static struct platform_driver lm78_isa_driver = {
180 .owner = THIS_MODULE,
183 .probe = lm78_isa_probe,
184 .remove = lm78_isa_remove,
189 static ssize_t show_in(struct device *dev, struct device_attribute *da,
192 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
193 struct lm78_data *data = lm78_update_device(dev);
194 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
197 static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
200 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
201 struct lm78_data *data = lm78_update_device(dev);
202 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
205 static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
209 struct lm78_data *data = lm78_update_device(dev);
210 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
213 static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
214 const char *buf, size_t count)
216 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
217 struct lm78_data *data = dev_get_drvdata(dev);
218 unsigned long val = simple_strtoul(buf, NULL, 10);
219 int nr = attr->index;
221 mutex_lock(&data->update_lock);
222 data->in_min[nr] = IN_TO_REG(val);
223 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
224 mutex_unlock(&data->update_lock);
228 static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
229 const char *buf, size_t count)
231 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
232 struct lm78_data *data = dev_get_drvdata(dev);
233 unsigned long val = simple_strtoul(buf, NULL, 10);
234 int nr = attr->index;
236 mutex_lock(&data->update_lock);
237 data->in_max[nr] = IN_TO_REG(val);
238 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
239 mutex_unlock(&data->update_lock);
243 #define show_in_offset(offset) \
244 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
245 show_in, NULL, offset); \
246 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
247 show_in_min, set_in_min, offset); \
248 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
249 show_in_max, set_in_max, offset);
260 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
263 struct lm78_data *data = lm78_update_device(dev);
264 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
267 static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
270 struct lm78_data *data = lm78_update_device(dev);
271 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
274 static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
275 const char *buf, size_t count)
277 struct lm78_data *data = dev_get_drvdata(dev);
278 long val = simple_strtol(buf, NULL, 10);
280 mutex_lock(&data->update_lock);
281 data->temp_over = TEMP_TO_REG(val);
282 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
283 mutex_unlock(&data->update_lock);
287 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
290 struct lm78_data *data = lm78_update_device(dev);
291 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
294 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
295 const char *buf, size_t count)
297 struct lm78_data *data = dev_get_drvdata(dev);
298 long val = simple_strtol(buf, NULL, 10);
300 mutex_lock(&data->update_lock);
301 data->temp_hyst = TEMP_TO_REG(val);
302 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
303 mutex_unlock(&data->update_lock);
307 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
308 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
309 show_temp_over, set_temp_over);
310 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
311 show_temp_hyst, set_temp_hyst);
314 static ssize_t show_fan(struct device *dev, struct device_attribute *da,
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
318 struct lm78_data *data = lm78_update_device(dev);
319 int nr = attr->index;
320 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
321 DIV_FROM_REG(data->fan_div[nr])) );
324 static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
328 struct lm78_data *data = lm78_update_device(dev);
329 int nr = attr->index;
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, struct device_attribute *da,
335 const char *buf, size_t count)
337 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
338 struct lm78_data *data = dev_get_drvdata(dev);
339 int nr = attr->index;
340 unsigned long val = simple_strtoul(buf, NULL, 10);
342 mutex_lock(&data->update_lock);
343 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
344 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
345 mutex_unlock(&data->update_lock);
349 static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
352 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
353 struct lm78_data *data = lm78_update_device(dev);
354 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
357 /* Note: we save and restore the fan minimum here, because its value is
358 determined in part by the fan divisor. This follows the principle of
359 least surprise; the user doesn't expect the fan minimum to change just
360 because the divisor changed. */
361 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
362 const char *buf, size_t count)
364 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
365 struct lm78_data *data = dev_get_drvdata(dev);
366 int nr = attr->index;
367 unsigned long val = simple_strtoul(buf, NULL, 10);
371 mutex_lock(&data->update_lock);
372 min = FAN_FROM_REG(data->fan_min[nr],
373 DIV_FROM_REG(data->fan_div[nr]));
376 case 1: data->fan_div[nr] = 0; break;
377 case 2: data->fan_div[nr] = 1; break;
378 case 4: data->fan_div[nr] = 2; break;
379 case 8: data->fan_div[nr] = 3; break;
381 dev_err(dev, "fan_div value %ld not "
382 "supported. Choose one of 1, 2, 4 or 8!\n", val);
383 mutex_unlock(&data->update_lock);
387 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
390 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
393 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
396 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
399 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
400 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
401 mutex_unlock(&data->update_lock);
406 #define show_fan_offset(offset) \
407 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
408 show_fan, NULL, offset - 1); \
409 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
410 show_fan_min, set_fan_min, offset - 1);
416 /* Fan 3 divisor is locked in H/W */
417 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
418 show_fan_div, set_fan_div, 0);
419 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
420 show_fan_div, set_fan_div, 1);
421 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
424 static ssize_t show_vid(struct device *dev, struct device_attribute *da,
427 struct lm78_data *data = lm78_update_device(dev);
428 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
430 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
433 static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
436 struct lm78_data *data = lm78_update_device(dev);
437 return sprintf(buf, "%u\n", data->alarms);
439 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
441 /* This function is called when:
442 * lm78_driver is inserted (when this module is loaded), for each
444 * when a new adapter is inserted (and lm78_driver is still present) */
445 static int lm78_attach_adapter(struct i2c_adapter *adapter)
447 if (!(adapter->class & I2C_CLASS_HWMON))
449 return i2c_probe(adapter, &addr_data, lm78_detect);
452 static struct attribute *lm78_attributes[] = {
453 &sensor_dev_attr_in0_input.dev_attr.attr,
454 &sensor_dev_attr_in0_min.dev_attr.attr,
455 &sensor_dev_attr_in0_max.dev_attr.attr,
456 &sensor_dev_attr_in1_input.dev_attr.attr,
457 &sensor_dev_attr_in1_min.dev_attr.attr,
458 &sensor_dev_attr_in1_max.dev_attr.attr,
459 &sensor_dev_attr_in2_input.dev_attr.attr,
460 &sensor_dev_attr_in2_min.dev_attr.attr,
461 &sensor_dev_attr_in2_max.dev_attr.attr,
462 &sensor_dev_attr_in3_input.dev_attr.attr,
463 &sensor_dev_attr_in3_min.dev_attr.attr,
464 &sensor_dev_attr_in3_max.dev_attr.attr,
465 &sensor_dev_attr_in4_input.dev_attr.attr,
466 &sensor_dev_attr_in4_min.dev_attr.attr,
467 &sensor_dev_attr_in4_max.dev_attr.attr,
468 &sensor_dev_attr_in5_input.dev_attr.attr,
469 &sensor_dev_attr_in5_min.dev_attr.attr,
470 &sensor_dev_attr_in5_max.dev_attr.attr,
471 &sensor_dev_attr_in6_input.dev_attr.attr,
472 &sensor_dev_attr_in6_min.dev_attr.attr,
473 &sensor_dev_attr_in6_max.dev_attr.attr,
474 &dev_attr_temp1_input.attr,
475 &dev_attr_temp1_max.attr,
476 &dev_attr_temp1_max_hyst.attr,
477 &sensor_dev_attr_fan1_input.dev_attr.attr,
478 &sensor_dev_attr_fan1_min.dev_attr.attr,
479 &sensor_dev_attr_fan1_div.dev_attr.attr,
480 &sensor_dev_attr_fan2_input.dev_attr.attr,
481 &sensor_dev_attr_fan2_min.dev_attr.attr,
482 &sensor_dev_attr_fan2_div.dev_attr.attr,
483 &sensor_dev_attr_fan3_input.dev_attr.attr,
484 &sensor_dev_attr_fan3_min.dev_attr.attr,
485 &sensor_dev_attr_fan3_div.dev_attr.attr,
486 &dev_attr_alarms.attr,
487 &dev_attr_cpu0_vid.attr,
492 static const struct attribute_group lm78_group = {
493 .attrs = lm78_attributes,
496 /* I2C devices get this name attribute automatically, but for ISA devices
497 we must create it by ourselves. */
498 static ssize_t show_name(struct device *dev, struct device_attribute
501 struct lm78_data *data = dev_get_drvdata(dev);
503 return sprintf(buf, "%s\n", data->client.name);
505 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
507 /* This function is called by i2c_probe */
508 static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
511 struct i2c_client *new_client;
512 struct lm78_data *data;
513 const char *client_name = "";
515 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
520 /* OK. For now, we presume we have a valid client. We now create the
521 client structure, even though we cannot fill it completely yet.
522 But it allows us to access lm78_{read,write}_value. */
524 if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
529 new_client = &data->client;
530 i2c_set_clientdata(new_client, data);
531 new_client->addr = address;
532 new_client->adapter = adapter;
533 new_client->driver = &lm78_driver;
535 /* Now, we do the remaining detection. */
537 if (lm78_read_value(data, LM78_REG_CONFIG) & 0x80) {
541 if (lm78_read_value(data, LM78_REG_I2C_ADDR) !=
548 /* Determine the chip type. */
550 i = lm78_read_value(data, LM78_REG_CHIPID);
551 if (i == 0x00 || i == 0x20 /* LM78 */
552 || i == 0x40) /* LM78-J */
554 else if ((i & 0xfe) == 0xc0)
558 dev_warn(&adapter->dev, "Ignoring 'force' "
559 "parameter for unknown chip at "
560 "adapter %d, address 0x%02x\n",
561 i2c_adapter_id(adapter), address);
568 client_name = "lm78";
569 } else if (kind == lm79) {
570 client_name = "lm79";
573 /* Fill in the remaining client fields and put into the global list */
574 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
577 /* Tell the I2C layer a new client has arrived */
578 if ((err = i2c_attach_client(new_client)))
581 /* Initialize the LM78 chip */
582 lm78_init_device(data);
584 /* Register sysfs hooks */
585 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group)))
588 data->class_dev = hwmon_device_register(&new_client->dev);
589 if (IS_ERR(data->class_dev)) {
590 err = PTR_ERR(data->class_dev);
597 sysfs_remove_group(&new_client->dev.kobj, &lm78_group);
599 i2c_detach_client(new_client);
606 static int lm78_detach_client(struct i2c_client *client)
608 struct lm78_data *data = i2c_get_clientdata(client);
611 hwmon_device_unregister(data->class_dev);
612 sysfs_remove_group(&client->dev.kobj, &lm78_group);
614 if ((err = i2c_detach_client(client)))
622 static int __devinit lm78_isa_probe(struct platform_device *pdev)
625 struct lm78_data *data;
626 struct resource *res;
629 /* Reserve the ISA region */
630 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
631 if (!request_region(res->start, LM78_EXTENT, "lm78")) {
636 if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
638 goto exit_release_region;
640 mutex_init(&data->lock);
641 data->client.addr = res->start;
642 i2c_set_clientdata(&data->client, data);
643 platform_set_drvdata(pdev, data);
645 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
652 strlcpy(data->client.name, name, I2C_NAME_SIZE);
654 /* Initialize the LM78 chip */
655 lm78_init_device(data);
657 /* Register sysfs hooks */
658 if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group))
659 || (err = device_create_file(&pdev->dev, &dev_attr_name)))
660 goto exit_remove_files;
662 data->class_dev = hwmon_device_register(&pdev->dev);
663 if (IS_ERR(data->class_dev)) {
664 err = PTR_ERR(data->class_dev);
665 goto exit_remove_files;
671 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
672 device_remove_file(&pdev->dev, &dev_attr_name);
675 release_region(res->start, LM78_EXTENT);
680 static int __devexit lm78_isa_remove(struct platform_device *pdev)
682 struct lm78_data *data = platform_get_drvdata(pdev);
684 hwmon_device_unregister(data->class_dev);
685 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
686 device_remove_file(&pdev->dev, &dev_attr_name);
687 release_region(data->client.addr, LM78_EXTENT);
693 /* The SMBus locks itself, but ISA access must be locked explicitly!
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 static int lm78_read_value(struct lm78_data *data, u8 reg)
700 struct i2c_client *client = &data->client;
702 if (!client->driver) { /* ISA device */
704 mutex_lock(&data->lock);
705 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
706 res = inb_p(client->addr + LM78_DATA_REG_OFFSET);
707 mutex_unlock(&data->lock);
710 return i2c_smbus_read_byte_data(client, reg);
713 /* The SMBus locks itself, but ISA access muse be locked explicitly!
714 We don't want to lock the whole ISA bus, so we lock each client
716 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
717 would slow down the LM78 access and should not be necessary.
718 There are some ugly typecasts here, but the good new is - they should
719 nowhere else be necessary! */
720 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
722 struct i2c_client *client = &data->client;
724 if (!client->driver) { /* ISA device */
725 mutex_lock(&data->lock);
726 outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
727 outb_p(value, client->addr + LM78_DATA_REG_OFFSET);
728 mutex_unlock(&data->lock);
731 return i2c_smbus_write_byte_data(client, reg, value);
734 static void lm78_init_device(struct lm78_data *data)
739 /* Start monitoring */
740 config = lm78_read_value(data, LM78_REG_CONFIG);
741 if ((config & 0x09) != 0x01)
742 lm78_write_value(data, LM78_REG_CONFIG,
743 (config & 0xf7) | 0x01);
745 /* A few vars need to be filled upon startup */
746 for (i = 0; i < 3; i++) {
747 data->fan_min[i] = lm78_read_value(data,
748 LM78_REG_FAN_MIN(i));
751 mutex_init(&data->update_lock);
754 static struct lm78_data *lm78_update_device(struct device *dev)
756 struct lm78_data *data = dev_get_drvdata(dev);
759 mutex_lock(&data->update_lock);
761 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
764 dev_dbg(dev, "Starting lm78 update\n");
766 for (i = 0; i <= 6; i++) {
768 lm78_read_value(data, LM78_REG_IN(i));
770 lm78_read_value(data, LM78_REG_IN_MIN(i));
772 lm78_read_value(data, LM78_REG_IN_MAX(i));
774 for (i = 0; i < 3; i++) {
776 lm78_read_value(data, LM78_REG_FAN(i));
778 lm78_read_value(data, LM78_REG_FAN_MIN(i));
780 data->temp = lm78_read_value(data, LM78_REG_TEMP);
782 lm78_read_value(data, LM78_REG_TEMP_OVER);
784 lm78_read_value(data, LM78_REG_TEMP_HYST);
785 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
786 data->vid = i & 0x0f;
787 if (data->type == lm79)
789 (lm78_read_value(data, LM78_REG_CHIPID) &
793 data->fan_div[0] = (i >> 4) & 0x03;
794 data->fan_div[1] = i >> 6;
795 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
796 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
797 data->last_updated = jiffies;
800 data->fan_div[2] = 1;
803 mutex_unlock(&data->update_lock);
808 /* return 1 if a supported chip is found, 0 otherwise */
809 static int __init lm78_isa_found(unsigned short address)
811 int val, save, found = 0;
813 if (!request_region(address, LM78_EXTENT, "lm78"))
816 #define REALLY_SLOW_IO
817 /* We need the timeouts for at least some LM78-like
818 chips. But only if we read 'undefined' registers. */
819 val = inb_p(address + 1);
820 if (inb_p(address + 2) != val
821 || inb_p(address + 3) != val
822 || inb_p(address + 7) != val)
824 #undef REALLY_SLOW_IO
826 /* We should be able to change the 7 LSB of the address port. The
827 MSB (busy flag) should be clear initially, set after the write. */
828 save = inb_p(address + LM78_ADDR_REG_OFFSET);
832 outb_p(val, address + LM78_ADDR_REG_OFFSET);
833 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
834 outb_p(save, address + LM78_ADDR_REG_OFFSET);
838 /* We found a device, now see if it could be an LM78 */
839 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
840 val = inb_p(address + LM78_DATA_REG_OFFSET);
843 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
844 val = inb_p(address + LM78_DATA_REG_OFFSET);
845 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
848 /* The busy flag should be clear again */
849 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
852 /* Explicitly prevent the misdetection of Winbond chips */
853 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
854 val = inb_p(address + LM78_DATA_REG_OFFSET);
855 if (val == 0xa3 || val == 0x5c)
858 /* Explicitly prevent the misdetection of ITE chips */
859 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
860 val = inb_p(address + LM78_DATA_REG_OFFSET);
864 /* Determine the chip type */
865 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
866 val = inb_p(address + LM78_DATA_REG_OFFSET);
867 if (val == 0x00 /* LM78 */
868 || val == 0x40 /* LM78-J */
869 || (val & 0xfe) == 0xc0) /* LM79 */
873 pr_info("lm78: Found an %s chip at %#x\n",
874 val & 0x80 ? "LM79" : "LM78", (int)address);
877 release_region(address, LM78_EXTENT);
881 static int __init lm78_isa_device_add(unsigned short address)
883 struct resource res = {
885 .end = address + LM78_EXTENT,
887 .flags = IORESOURCE_IO,
891 pdev = platform_device_alloc("lm78", address);
894 printk(KERN_ERR "lm78: Device allocation failed\n");
898 err = platform_device_add_resources(pdev, &res, 1);
900 printk(KERN_ERR "lm78: Device resource addition failed "
902 goto exit_device_put;
905 err = platform_device_add(pdev);
907 printk(KERN_ERR "lm78: Device addition failed (%d)\n",
909 goto exit_device_put;
915 platform_device_put(pdev);
921 static int __init sm_lm78_init(void)
925 res = i2c_add_driver(&lm78_driver);
929 if (lm78_isa_found(isa_address)) {
930 res = platform_driver_register(&lm78_isa_driver);
932 goto exit_unreg_i2c_driver;
934 /* Sets global pdev as a side effect */
935 res = lm78_isa_device_add(isa_address);
937 goto exit_unreg_isa_driver;
942 exit_unreg_isa_driver:
943 platform_driver_unregister(&lm78_isa_driver);
944 exit_unreg_i2c_driver:
945 i2c_del_driver(&lm78_driver);
950 static void __exit sm_lm78_exit(void)
953 platform_device_unregister(pdev);
954 platform_driver_unregister(&lm78_isa_driver);
956 i2c_del_driver(&lm78_driver);
961 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
962 MODULE_DESCRIPTION("LM78/LM79 driver");
963 MODULE_LICENSE("GPL");
965 module_init(sm_lm78_init);
966 module_exit(sm_lm78_exit);