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, 2011 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/jiffies.h>
28 #include <linux/i2c.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 #include <linux/platform_device.h>
37 #include <linux/ioport.h>
41 /* Addresses to scan */
42 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
43 0x2e, 0x2f, I2C_CLIENT_END };
44 enum chips { lm78, lm79 };
46 /* Many LM78 constants specified below */
48 /* Length of ISA address segment */
51 /* Where are the ISA address/data registers relative to the base address */
52 #define LM78_ADDR_REG_OFFSET 5
53 #define LM78_DATA_REG_OFFSET 6
55 /* The LM78 registers */
56 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
57 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
58 #define LM78_REG_IN(nr) (0x20 + (nr))
60 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
61 #define LM78_REG_FAN(nr) (0x28 + (nr))
63 #define LM78_REG_TEMP 0x27
64 #define LM78_REG_TEMP_OVER 0x39
65 #define LM78_REG_TEMP_HYST 0x3a
67 #define LM78_REG_ALARM1 0x41
68 #define LM78_REG_ALARM2 0x42
70 #define LM78_REG_VID_FANDIV 0x47
72 #define LM78_REG_CONFIG 0x40
73 #define LM78_REG_CHIPID 0x49
74 #define LM78_REG_I2C_ADDR 0x48
78 * Conversions. Rounding and limit checking is only done on the TO_REG
83 * IN: mV (0V to 4.08V)
86 static inline u8 IN_TO_REG(unsigned long val)
88 unsigned long nval = clamp_val(val, 0, 4080);
89 return (nval + 8) / 16;
91 #define IN_FROM_REG(val) ((val) * 16)
93 static inline u8 FAN_TO_REG(long rpm, int div)
97 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
100 static inline int FAN_FROM_REG(u8 val, int div)
102 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
106 * TEMP: mC (-128C to +127C)
107 * REG: 1C/bit, two's complement
109 static inline s8 TEMP_TO_REG(int val)
111 int nval = clamp_val(val, -128000, 127000) ;
112 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
115 static inline int TEMP_FROM_REG(s8 val)
120 #define DIV_FROM_REG(val) (1 << (val))
123 struct i2c_client *client;
124 struct device *hwmon_dev;
128 /* For ISA device only */
132 struct mutex update_lock;
133 char valid; /* !=0 if following fields are valid */
134 unsigned long last_updated; /* In jiffies */
136 u8 in[7]; /* Register value */
137 u8 in_max[7]; /* Register value */
138 u8 in_min[7]; /* Register value */
139 u8 fan[3]; /* Register value */
140 u8 fan_min[3]; /* Register value */
141 s8 temp; /* Register value */
142 s8 temp_over; /* Register value */
143 s8 temp_hyst; /* Register value */
144 u8 fan_div[3]; /* Register encoding, shifted right */
145 u8 vid; /* Register encoding, combined */
146 u16 alarms; /* Register encoding, combined */
150 static int lm78_read_value(struct lm78_data *data, u8 reg);
151 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
152 static struct lm78_data *lm78_update_device(struct device *dev);
153 static void lm78_init_device(struct lm78_data *data);
157 static ssize_t show_in(struct device *dev, struct device_attribute *da,
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
161 struct lm78_data *data = lm78_update_device(dev);
162 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
165 static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
168 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
169 struct lm78_data *data = lm78_update_device(dev);
170 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
173 static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
176 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
177 struct lm78_data *data = lm78_update_device(dev);
178 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
181 static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
182 const char *buf, size_t count)
184 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
185 struct lm78_data *data = dev_get_drvdata(dev);
186 int nr = attr->index;
190 err = kstrtoul(buf, 10, &val);
194 mutex_lock(&data->update_lock);
195 data->in_min[nr] = IN_TO_REG(val);
196 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
197 mutex_unlock(&data->update_lock);
201 static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
202 const char *buf, size_t count)
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
205 struct lm78_data *data = dev_get_drvdata(dev);
206 int nr = attr->index;
210 err = kstrtoul(buf, 10, &val);
214 mutex_lock(&data->update_lock);
215 data->in_max[nr] = IN_TO_REG(val);
216 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
217 mutex_unlock(&data->update_lock);
221 #define show_in_offset(offset) \
222 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
223 show_in, NULL, offset); \
224 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
225 show_in_min, set_in_min, offset); \
226 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
227 show_in_max, set_in_max, offset);
238 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
241 struct lm78_data *data = lm78_update_device(dev);
242 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
245 static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
248 struct lm78_data *data = lm78_update_device(dev);
249 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
252 static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
253 const char *buf, size_t count)
255 struct lm78_data *data = dev_get_drvdata(dev);
259 err = kstrtol(buf, 10, &val);
263 mutex_lock(&data->update_lock);
264 data->temp_over = TEMP_TO_REG(val);
265 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
266 mutex_unlock(&data->update_lock);
270 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
273 struct lm78_data *data = lm78_update_device(dev);
274 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
277 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
278 const char *buf, size_t count)
280 struct lm78_data *data = dev_get_drvdata(dev);
284 err = kstrtol(buf, 10, &val);
288 mutex_lock(&data->update_lock);
289 data->temp_hyst = TEMP_TO_REG(val);
290 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
291 mutex_unlock(&data->update_lock);
295 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
296 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
297 show_temp_over, set_temp_over);
298 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
299 show_temp_hyst, set_temp_hyst);
302 static ssize_t show_fan(struct device *dev, struct device_attribute *da,
305 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
306 struct lm78_data *data = lm78_update_device(dev);
307 int nr = attr->index;
308 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
309 DIV_FROM_REG(data->fan_div[nr])));
312 static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
315 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
316 struct lm78_data *data = lm78_update_device(dev);
317 int nr = attr->index;
318 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
319 DIV_FROM_REG(data->fan_div[nr])));
322 static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
323 const char *buf, size_t count)
325 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
326 struct lm78_data *data = dev_get_drvdata(dev);
327 int nr = attr->index;
331 err = kstrtoul(buf, 10, &val);
335 mutex_lock(&data->update_lock);
336 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
337 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
338 mutex_unlock(&data->update_lock);
342 static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
345 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
346 struct lm78_data *data = lm78_update_device(dev);
347 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
351 * Note: we save and restore the fan minimum here, because its value is
352 * determined in part by the fan divisor. This follows the principle of
353 * least surprise; the user doesn't expect the fan minimum to change just
354 * because the divisor changed.
356 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
357 const char *buf, size_t count)
359 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
360 struct lm78_data *data = dev_get_drvdata(dev);
361 int nr = attr->index;
367 err = kstrtoul(buf, 10, &val);
371 mutex_lock(&data->update_lock);
372 min = FAN_FROM_REG(data->fan_min[nr],
373 DIV_FROM_REG(data->fan_div[nr]));
377 data->fan_div[nr] = 0;
380 data->fan_div[nr] = 1;
383 data->fan_div[nr] = 2;
386 data->fan_div[nr] = 3;
389 dev_err(dev, "fan_div value %ld not "
390 "supported. Choose one of 1, 2, 4 or 8!\n", val);
391 mutex_unlock(&data->update_lock);
395 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
398 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
401 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
404 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
407 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
408 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
409 mutex_unlock(&data->update_lock);
414 #define show_fan_offset(offset) \
415 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
416 show_fan, NULL, offset - 1); \
417 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
418 show_fan_min, set_fan_min, offset - 1);
424 /* Fan 3 divisor is locked in H/W */
425 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
426 show_fan_div, set_fan_div, 0);
427 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
428 show_fan_div, set_fan_div, 1);
429 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
432 static ssize_t show_vid(struct device *dev, struct device_attribute *da,
435 struct lm78_data *data = lm78_update_device(dev);
436 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
438 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
441 static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
444 struct lm78_data *data = lm78_update_device(dev);
445 return sprintf(buf, "%u\n", data->alarms);
447 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
449 static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
452 struct lm78_data *data = lm78_update_device(dev);
453 int nr = to_sensor_dev_attr(da)->index;
454 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
456 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
457 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
458 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
459 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
460 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
461 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
462 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
463 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
464 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
465 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
466 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
468 static struct attribute *lm78_attributes[] = {
469 &sensor_dev_attr_in0_input.dev_attr.attr,
470 &sensor_dev_attr_in0_min.dev_attr.attr,
471 &sensor_dev_attr_in0_max.dev_attr.attr,
472 &sensor_dev_attr_in0_alarm.dev_attr.attr,
473 &sensor_dev_attr_in1_input.dev_attr.attr,
474 &sensor_dev_attr_in1_min.dev_attr.attr,
475 &sensor_dev_attr_in1_max.dev_attr.attr,
476 &sensor_dev_attr_in1_alarm.dev_attr.attr,
477 &sensor_dev_attr_in2_input.dev_attr.attr,
478 &sensor_dev_attr_in2_min.dev_attr.attr,
479 &sensor_dev_attr_in2_max.dev_attr.attr,
480 &sensor_dev_attr_in2_alarm.dev_attr.attr,
481 &sensor_dev_attr_in3_input.dev_attr.attr,
482 &sensor_dev_attr_in3_min.dev_attr.attr,
483 &sensor_dev_attr_in3_max.dev_attr.attr,
484 &sensor_dev_attr_in3_alarm.dev_attr.attr,
485 &sensor_dev_attr_in4_input.dev_attr.attr,
486 &sensor_dev_attr_in4_min.dev_attr.attr,
487 &sensor_dev_attr_in4_max.dev_attr.attr,
488 &sensor_dev_attr_in4_alarm.dev_attr.attr,
489 &sensor_dev_attr_in5_input.dev_attr.attr,
490 &sensor_dev_attr_in5_min.dev_attr.attr,
491 &sensor_dev_attr_in5_max.dev_attr.attr,
492 &sensor_dev_attr_in5_alarm.dev_attr.attr,
493 &sensor_dev_attr_in6_input.dev_attr.attr,
494 &sensor_dev_attr_in6_min.dev_attr.attr,
495 &sensor_dev_attr_in6_max.dev_attr.attr,
496 &sensor_dev_attr_in6_alarm.dev_attr.attr,
497 &dev_attr_temp1_input.attr,
498 &dev_attr_temp1_max.attr,
499 &dev_attr_temp1_max_hyst.attr,
500 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
501 &sensor_dev_attr_fan1_input.dev_attr.attr,
502 &sensor_dev_attr_fan1_min.dev_attr.attr,
503 &sensor_dev_attr_fan1_div.dev_attr.attr,
504 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
505 &sensor_dev_attr_fan2_input.dev_attr.attr,
506 &sensor_dev_attr_fan2_min.dev_attr.attr,
507 &sensor_dev_attr_fan2_div.dev_attr.attr,
508 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
509 &sensor_dev_attr_fan3_input.dev_attr.attr,
510 &sensor_dev_attr_fan3_min.dev_attr.attr,
511 &sensor_dev_attr_fan3_div.dev_attr.attr,
512 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
513 &dev_attr_alarms.attr,
514 &dev_attr_cpu0_vid.attr,
519 static const struct attribute_group lm78_group = {
520 .attrs = lm78_attributes,
528 /* ISA device, if found */
529 static struct platform_device *pdev;
531 static unsigned short isa_address = 0x290;
534 * I2C devices get this name attribute automatically, but for ISA devices
535 * we must create it by ourselves.
537 static ssize_t show_name(struct device *dev, struct device_attribute
540 struct lm78_data *data = dev_get_drvdata(dev);
542 return sprintf(buf, "%s\n", data->name);
544 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
546 static struct lm78_data *lm78_data_if_isa(void)
548 return pdev ? platform_get_drvdata(pdev) : NULL;
551 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
552 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
554 struct lm78_data *isa;
557 if (!pdev) /* No ISA chip */
559 isa = platform_get_drvdata(pdev);
561 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
562 return 0; /* Address doesn't match */
563 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
564 return 0; /* Chip type doesn't match */
567 * We compare all the limit registers, the config register and the
568 * interrupt mask registers
570 for (i = 0x2b; i <= 0x3d; i++) {
571 if (lm78_read_value(isa, i) !=
572 i2c_smbus_read_byte_data(client, i))
575 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
576 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
578 for (i = 0x43; i <= 0x46; i++) {
579 if (lm78_read_value(isa, i) !=
580 i2c_smbus_read_byte_data(client, i))
586 #else /* !CONFIG_ISA */
588 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
593 static struct lm78_data *lm78_data_if_isa(void)
597 #endif /* CONFIG_ISA */
599 static int lm78_i2c_detect(struct i2c_client *client,
600 struct i2c_board_info *info)
603 struct lm78_data *isa = lm78_data_if_isa();
604 const char *client_name;
605 struct i2c_adapter *adapter = client->adapter;
606 int address = client->addr;
608 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
612 * We block updates of the ISA device to minimize the risk of
613 * concurrent access to the same LM78 chip through different
617 mutex_lock(&isa->update_lock);
619 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
620 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
623 /* Explicitly prevent the misdetection of Winbond chips */
624 i = i2c_smbus_read_byte_data(client, 0x4f);
625 if (i == 0xa3 || i == 0x5c)
628 /* Determine the chip type. */
629 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
630 if (i == 0x00 || i == 0x20 /* LM78 */
631 || i == 0x40) /* LM78-J */
632 client_name = "lm78";
633 else if ((i & 0xfe) == 0xc0)
634 client_name = "lm79";
638 if (lm78_alias_detect(client, i)) {
639 dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
640 "be the same as ISA device\n", address);
645 mutex_unlock(&isa->update_lock);
647 strlcpy(info->type, client_name, I2C_NAME_SIZE);
653 mutex_unlock(&isa->update_lock);
657 static int lm78_i2c_probe(struct i2c_client *client,
658 const struct i2c_device_id *id)
660 struct lm78_data *data;
663 data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL);
667 i2c_set_clientdata(client, data);
668 data->client = client;
669 data->type = id->driver_data;
671 /* Initialize the LM78 chip */
672 lm78_init_device(data);
674 /* Register sysfs hooks */
675 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
679 data->hwmon_dev = hwmon_device_register(&client->dev);
680 if (IS_ERR(data->hwmon_dev)) {
681 err = PTR_ERR(data->hwmon_dev);
688 sysfs_remove_group(&client->dev.kobj, &lm78_group);
692 static int lm78_i2c_remove(struct i2c_client *client)
694 struct lm78_data *data = i2c_get_clientdata(client);
696 hwmon_device_unregister(data->hwmon_dev);
697 sysfs_remove_group(&client->dev.kobj, &lm78_group);
702 static const struct i2c_device_id lm78_i2c_id[] = {
707 MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
709 static struct i2c_driver lm78_driver = {
710 .class = I2C_CLASS_HWMON,
714 .probe = lm78_i2c_probe,
715 .remove = lm78_i2c_remove,
716 .id_table = lm78_i2c_id,
717 .detect = lm78_i2c_detect,
718 .address_list = normal_i2c,
722 * The SMBus locks itself, but ISA access must be locked explicitly!
723 * We don't want to lock the whole ISA bus, so we lock each client
725 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
726 * would slow down the LM78 access and should not be necessary.
728 static int lm78_read_value(struct lm78_data *data, u8 reg)
730 struct i2c_client *client = data->client;
733 if (!client) { /* ISA device */
735 mutex_lock(&data->lock);
736 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
737 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
738 mutex_unlock(&data->lock);
742 return i2c_smbus_read_byte_data(client, reg);
745 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
747 struct i2c_client *client = data->client;
750 if (!client) { /* ISA device */
751 mutex_lock(&data->lock);
752 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
753 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
754 mutex_unlock(&data->lock);
758 return i2c_smbus_write_byte_data(client, reg, value);
761 static void lm78_init_device(struct lm78_data *data)
766 /* Start monitoring */
767 config = lm78_read_value(data, LM78_REG_CONFIG);
768 if ((config & 0x09) != 0x01)
769 lm78_write_value(data, LM78_REG_CONFIG,
770 (config & 0xf7) | 0x01);
772 /* A few vars need to be filled upon startup */
773 for (i = 0; i < 3; i++) {
774 data->fan_min[i] = lm78_read_value(data,
775 LM78_REG_FAN_MIN(i));
778 mutex_init(&data->update_lock);
781 static struct lm78_data *lm78_update_device(struct device *dev)
783 struct lm78_data *data = dev_get_drvdata(dev);
786 mutex_lock(&data->update_lock);
788 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
791 dev_dbg(dev, "Starting lm78 update\n");
793 for (i = 0; i <= 6; i++) {
795 lm78_read_value(data, LM78_REG_IN(i));
797 lm78_read_value(data, LM78_REG_IN_MIN(i));
799 lm78_read_value(data, LM78_REG_IN_MAX(i));
801 for (i = 0; i < 3; i++) {
803 lm78_read_value(data, LM78_REG_FAN(i));
805 lm78_read_value(data, LM78_REG_FAN_MIN(i));
807 data->temp = lm78_read_value(data, LM78_REG_TEMP);
809 lm78_read_value(data, LM78_REG_TEMP_OVER);
811 lm78_read_value(data, LM78_REG_TEMP_HYST);
812 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
813 data->vid = i & 0x0f;
814 if (data->type == lm79)
816 (lm78_read_value(data, LM78_REG_CHIPID) &
820 data->fan_div[0] = (i >> 4) & 0x03;
821 data->fan_div[1] = i >> 6;
822 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
823 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
824 data->last_updated = jiffies;
827 data->fan_div[2] = 1;
830 mutex_unlock(&data->update_lock);
836 static int lm78_isa_probe(struct platform_device *pdev)
839 struct lm78_data *data;
840 struct resource *res;
842 /* Reserve the ISA region */
843 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
844 if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET,
848 data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL);
852 mutex_init(&data->lock);
853 data->isa_addr = res->start;
854 platform_set_drvdata(pdev, data);
856 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
864 /* Initialize the LM78 chip */
865 lm78_init_device(data);
867 /* Register sysfs hooks */
868 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
870 goto exit_remove_files;
871 err = device_create_file(&pdev->dev, &dev_attr_name);
873 goto exit_remove_files;
875 data->hwmon_dev = hwmon_device_register(&pdev->dev);
876 if (IS_ERR(data->hwmon_dev)) {
877 err = PTR_ERR(data->hwmon_dev);
878 goto exit_remove_files;
884 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
885 device_remove_file(&pdev->dev, &dev_attr_name);
889 static int lm78_isa_remove(struct platform_device *pdev)
891 struct lm78_data *data = platform_get_drvdata(pdev);
893 hwmon_device_unregister(data->hwmon_dev);
894 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
895 device_remove_file(&pdev->dev, &dev_attr_name);
900 static struct platform_driver lm78_isa_driver = {
902 .owner = THIS_MODULE,
905 .probe = lm78_isa_probe,
906 .remove = lm78_isa_remove,
909 /* return 1 if a supported chip is found, 0 otherwise */
910 static int __init lm78_isa_found(unsigned short address)
912 int val, save, found = 0;
916 * Some boards declare base+0 to base+7 as a PNP device, some base+4
917 * to base+7 and some base+5 to base+6. So we better request each port
918 * individually for the probing phase.
920 for (port = address; port < address + LM78_EXTENT; port++) {
921 if (!request_region(port, 1, "lm78")) {
922 pr_debug("Failed to request port 0x%x\n", port);
927 #define REALLY_SLOW_IO
929 * We need the timeouts for at least some LM78-like
930 * chips. But only if we read 'undefined' registers.
932 val = inb_p(address + 1);
933 if (inb_p(address + 2) != val
934 || inb_p(address + 3) != val
935 || inb_p(address + 7) != val)
937 #undef REALLY_SLOW_IO
940 * We should be able to change the 7 LSB of the address port. The
941 * MSB (busy flag) should be clear initially, set after the write.
943 save = inb_p(address + LM78_ADDR_REG_OFFSET);
947 outb_p(val, address + LM78_ADDR_REG_OFFSET);
948 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
949 outb_p(save, address + LM78_ADDR_REG_OFFSET);
953 /* We found a device, now see if it could be an LM78 */
954 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
955 val = inb_p(address + LM78_DATA_REG_OFFSET);
958 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
959 val = inb_p(address + LM78_DATA_REG_OFFSET);
960 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
963 /* The busy flag should be clear again */
964 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
967 /* Explicitly prevent the misdetection of Winbond chips */
968 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
969 val = inb_p(address + LM78_DATA_REG_OFFSET);
970 if (val == 0xa3 || val == 0x5c)
973 /* Explicitly prevent the misdetection of ITE chips */
974 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
975 val = inb_p(address + LM78_DATA_REG_OFFSET);
979 /* Determine the chip type */
980 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
981 val = inb_p(address + LM78_DATA_REG_OFFSET);
982 if (val == 0x00 || val == 0x20 /* LM78 */
983 || val == 0x40 /* LM78-J */
984 || (val & 0xfe) == 0xc0) /* LM79 */
988 pr_info("Found an %s chip at %#x\n",
989 val & 0x80 ? "LM79" : "LM78", (int)address);
992 for (port--; port >= address; port--)
993 release_region(port, 1);
997 static int __init lm78_isa_device_add(unsigned short address)
999 struct resource res = {
1001 .end = address + LM78_EXTENT - 1,
1003 .flags = IORESOURCE_IO,
1007 pdev = platform_device_alloc("lm78", address);
1010 pr_err("Device allocation failed\n");
1014 err = platform_device_add_resources(pdev, &res, 1);
1016 pr_err("Device resource addition failed (%d)\n", err);
1017 goto exit_device_put;
1020 err = platform_device_add(pdev);
1022 pr_err("Device addition failed (%d)\n", err);
1023 goto exit_device_put;
1029 platform_device_put(pdev);
1035 static int __init lm78_isa_register(void)
1039 if (lm78_isa_found(isa_address)) {
1040 res = platform_driver_register(&lm78_isa_driver);
1044 /* Sets global pdev as a side effect */
1045 res = lm78_isa_device_add(isa_address);
1047 goto exit_unreg_isa_driver;
1052 exit_unreg_isa_driver:
1053 platform_driver_unregister(&lm78_isa_driver);
1058 static void lm78_isa_unregister(void)
1061 platform_device_unregister(pdev);
1062 platform_driver_unregister(&lm78_isa_driver);
1065 #else /* !CONFIG_ISA */
1067 static int __init lm78_isa_register(void)
1072 static void lm78_isa_unregister(void)
1075 #endif /* CONFIG_ISA */
1077 static int __init sm_lm78_init(void)
1082 * We register the ISA device first, so that we can skip the
1083 * registration of an I2C interface to the same device.
1085 res = lm78_isa_register();
1089 res = i2c_add_driver(&lm78_driver);
1091 goto exit_unreg_isa_device;
1095 exit_unreg_isa_device:
1096 lm78_isa_unregister();
1101 static void __exit sm_lm78_exit(void)
1103 lm78_isa_unregister();
1104 i2c_del_driver(&lm78_driver);
1107 MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>");
1108 MODULE_DESCRIPTION("LM78/LM79 driver");
1109 MODULE_LICENSE("GPL");
1111 module_init(sm_lm78_init);
1112 module_exit(sm_lm78_exit);