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)
99 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
102 static inline int FAN_FROM_REG(u8 val, int div)
104 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
108 * TEMP: mC (-128C to +127C)
109 * REG: 1C/bit, two's complement
111 static inline s8 TEMP_TO_REG(int val)
113 int nval = clamp_val(val, -128000, 127000) ;
114 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
117 static inline int TEMP_FROM_REG(s8 val)
122 #define DIV_FROM_REG(val) (1 << (val))
125 struct i2c_client *client;
126 struct device *hwmon_dev;
130 /* For ISA device only */
134 struct mutex update_lock;
135 char valid; /* !=0 if following fields are valid */
136 unsigned long last_updated; /* In jiffies */
138 u8 in[7]; /* Register value */
139 u8 in_max[7]; /* Register value */
140 u8 in_min[7]; /* Register value */
141 u8 fan[3]; /* Register value */
142 u8 fan_min[3]; /* Register value */
143 s8 temp; /* Register value */
144 s8 temp_over; /* Register value */
145 s8 temp_hyst; /* Register value */
146 u8 fan_div[3]; /* Register encoding, shifted right */
147 u8 vid; /* Register encoding, combined */
148 u16 alarms; /* Register encoding, combined */
152 static int lm78_read_value(struct lm78_data *data, u8 reg);
153 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
154 static struct lm78_data *lm78_update_device(struct device *dev);
155 static void lm78_init_device(struct lm78_data *data);
159 static ssize_t show_in(struct device *dev, struct device_attribute *da,
162 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
163 struct lm78_data *data = lm78_update_device(dev);
164 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
167 static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
170 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
171 struct lm78_data *data = lm78_update_device(dev);
172 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
175 static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
178 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
179 struct lm78_data *data = lm78_update_device(dev);
180 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
183 static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
184 const char *buf, size_t count)
186 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
187 struct lm78_data *data = dev_get_drvdata(dev);
188 int nr = attr->index;
192 err = kstrtoul(buf, 10, &val);
196 mutex_lock(&data->update_lock);
197 data->in_min[nr] = IN_TO_REG(val);
198 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
199 mutex_unlock(&data->update_lock);
203 static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
204 const char *buf, size_t count)
206 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
207 struct lm78_data *data = dev_get_drvdata(dev);
208 int nr = attr->index;
212 err = kstrtoul(buf, 10, &val);
216 mutex_lock(&data->update_lock);
217 data->in_max[nr] = IN_TO_REG(val);
218 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
219 mutex_unlock(&data->update_lock);
223 #define show_in_offset(offset) \
224 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
225 show_in, NULL, offset); \
226 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
227 show_in_min, set_in_min, offset); \
228 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
229 show_in_max, set_in_max, offset);
240 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
243 struct lm78_data *data = lm78_update_device(dev);
244 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
247 static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
250 struct lm78_data *data = lm78_update_device(dev);
251 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
254 static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
255 const char *buf, size_t count)
257 struct lm78_data *data = dev_get_drvdata(dev);
261 err = kstrtol(buf, 10, &val);
265 mutex_lock(&data->update_lock);
266 data->temp_over = TEMP_TO_REG(val);
267 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
268 mutex_unlock(&data->update_lock);
272 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
275 struct lm78_data *data = lm78_update_device(dev);
276 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
279 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
280 const char *buf, size_t count)
282 struct lm78_data *data = dev_get_drvdata(dev);
286 err = kstrtol(buf, 10, &val);
290 mutex_lock(&data->update_lock);
291 data->temp_hyst = TEMP_TO_REG(val);
292 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
293 mutex_unlock(&data->update_lock);
297 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
298 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
299 show_temp_over, set_temp_over);
300 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
301 show_temp_hyst, set_temp_hyst);
304 static ssize_t show_fan(struct device *dev, struct device_attribute *da,
307 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
308 struct lm78_data *data = lm78_update_device(dev);
309 int nr = attr->index;
310 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
311 DIV_FROM_REG(data->fan_div[nr])));
314 static ssize_t show_fan_min(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_min[nr],
321 DIV_FROM_REG(data->fan_div[nr])));
324 static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
325 const char *buf, size_t count)
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
328 struct lm78_data *data = dev_get_drvdata(dev);
329 int nr = attr->index;
333 err = kstrtoul(buf, 10, &val);
337 mutex_lock(&data->update_lock);
338 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
339 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
340 mutex_unlock(&data->update_lock);
344 static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
347 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
348 struct lm78_data *data = lm78_update_device(dev);
349 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
353 * Note: we save and restore the fan minimum here, because its value is
354 * determined in part by the fan divisor. This follows the principle of
355 * least surprise; the user doesn't expect the fan minimum to change just
356 * because the divisor changed.
358 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
359 const char *buf, size_t count)
361 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
362 struct lm78_data *data = dev_get_drvdata(dev);
363 int nr = attr->index;
369 err = kstrtoul(buf, 10, &val);
373 mutex_lock(&data->update_lock);
374 min = FAN_FROM_REG(data->fan_min[nr],
375 DIV_FROM_REG(data->fan_div[nr]));
379 data->fan_div[nr] = 0;
382 data->fan_div[nr] = 1;
385 data->fan_div[nr] = 2;
388 data->fan_div[nr] = 3;
392 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
394 mutex_unlock(&data->update_lock);
398 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
401 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
404 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
407 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
410 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
411 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
412 mutex_unlock(&data->update_lock);
417 #define show_fan_offset(offset) \
418 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
419 show_fan, NULL, offset - 1); \
420 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
421 show_fan_min, set_fan_min, offset - 1);
427 /* Fan 3 divisor is locked in H/W */
428 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
429 show_fan_div, set_fan_div, 0);
430 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
431 show_fan_div, set_fan_div, 1);
432 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
435 static ssize_t show_vid(struct device *dev, struct device_attribute *da,
438 struct lm78_data *data = lm78_update_device(dev);
439 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
441 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
444 static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
447 struct lm78_data *data = lm78_update_device(dev);
448 return sprintf(buf, "%u\n", data->alarms);
450 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
452 static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
455 struct lm78_data *data = lm78_update_device(dev);
456 int nr = to_sensor_dev_attr(da)->index;
457 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
459 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
460 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
461 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
462 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
463 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
464 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
465 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
466 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
467 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
468 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
469 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
471 static struct attribute *lm78_attributes[] = {
472 &sensor_dev_attr_in0_input.dev_attr.attr,
473 &sensor_dev_attr_in0_min.dev_attr.attr,
474 &sensor_dev_attr_in0_max.dev_attr.attr,
475 &sensor_dev_attr_in0_alarm.dev_attr.attr,
476 &sensor_dev_attr_in1_input.dev_attr.attr,
477 &sensor_dev_attr_in1_min.dev_attr.attr,
478 &sensor_dev_attr_in1_max.dev_attr.attr,
479 &sensor_dev_attr_in1_alarm.dev_attr.attr,
480 &sensor_dev_attr_in2_input.dev_attr.attr,
481 &sensor_dev_attr_in2_min.dev_attr.attr,
482 &sensor_dev_attr_in2_max.dev_attr.attr,
483 &sensor_dev_attr_in2_alarm.dev_attr.attr,
484 &sensor_dev_attr_in3_input.dev_attr.attr,
485 &sensor_dev_attr_in3_min.dev_attr.attr,
486 &sensor_dev_attr_in3_max.dev_attr.attr,
487 &sensor_dev_attr_in3_alarm.dev_attr.attr,
488 &sensor_dev_attr_in4_input.dev_attr.attr,
489 &sensor_dev_attr_in4_min.dev_attr.attr,
490 &sensor_dev_attr_in4_max.dev_attr.attr,
491 &sensor_dev_attr_in4_alarm.dev_attr.attr,
492 &sensor_dev_attr_in5_input.dev_attr.attr,
493 &sensor_dev_attr_in5_min.dev_attr.attr,
494 &sensor_dev_attr_in5_max.dev_attr.attr,
495 &sensor_dev_attr_in5_alarm.dev_attr.attr,
496 &sensor_dev_attr_in6_input.dev_attr.attr,
497 &sensor_dev_attr_in6_min.dev_attr.attr,
498 &sensor_dev_attr_in6_max.dev_attr.attr,
499 &sensor_dev_attr_in6_alarm.dev_attr.attr,
500 &dev_attr_temp1_input.attr,
501 &dev_attr_temp1_max.attr,
502 &dev_attr_temp1_max_hyst.attr,
503 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
504 &sensor_dev_attr_fan1_input.dev_attr.attr,
505 &sensor_dev_attr_fan1_min.dev_attr.attr,
506 &sensor_dev_attr_fan1_div.dev_attr.attr,
507 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
508 &sensor_dev_attr_fan2_input.dev_attr.attr,
509 &sensor_dev_attr_fan2_min.dev_attr.attr,
510 &sensor_dev_attr_fan2_div.dev_attr.attr,
511 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
512 &sensor_dev_attr_fan3_input.dev_attr.attr,
513 &sensor_dev_attr_fan3_min.dev_attr.attr,
514 &sensor_dev_attr_fan3_div.dev_attr.attr,
515 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
516 &dev_attr_alarms.attr,
517 &dev_attr_cpu0_vid.attr,
522 static const struct attribute_group lm78_group = {
523 .attrs = lm78_attributes,
531 /* ISA device, if found */
532 static struct platform_device *pdev;
534 static unsigned short isa_address = 0x290;
537 * I2C devices get this name attribute automatically, but for ISA devices
538 * we must create it by ourselves.
540 static ssize_t show_name(struct device *dev, struct device_attribute
543 struct lm78_data *data = dev_get_drvdata(dev);
545 return sprintf(buf, "%s\n", data->name);
547 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
549 static struct lm78_data *lm78_data_if_isa(void)
551 return pdev ? platform_get_drvdata(pdev) : NULL;
554 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
555 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
557 struct lm78_data *isa;
560 if (!pdev) /* No ISA chip */
562 isa = platform_get_drvdata(pdev);
564 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
565 return 0; /* Address doesn't match */
566 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
567 return 0; /* Chip type doesn't match */
570 * We compare all the limit registers, the config register and the
571 * interrupt mask registers
573 for (i = 0x2b; i <= 0x3d; i++) {
574 if (lm78_read_value(isa, i) !=
575 i2c_smbus_read_byte_data(client, i))
578 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
579 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
581 for (i = 0x43; i <= 0x46; i++) {
582 if (lm78_read_value(isa, i) !=
583 i2c_smbus_read_byte_data(client, i))
589 #else /* !CONFIG_ISA */
591 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
596 static struct lm78_data *lm78_data_if_isa(void)
600 #endif /* CONFIG_ISA */
602 static int lm78_i2c_detect(struct i2c_client *client,
603 struct i2c_board_info *info)
606 struct lm78_data *isa = lm78_data_if_isa();
607 const char *client_name;
608 struct i2c_adapter *adapter = client->adapter;
609 int address = client->addr;
611 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
615 * We block updates of the ISA device to minimize the risk of
616 * concurrent access to the same LM78 chip through different
620 mutex_lock(&isa->update_lock);
622 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
623 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
626 /* Explicitly prevent the misdetection of Winbond chips */
627 i = i2c_smbus_read_byte_data(client, 0x4f);
628 if (i == 0xa3 || i == 0x5c)
631 /* Determine the chip type. */
632 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
633 if (i == 0x00 || i == 0x20 /* LM78 */
634 || i == 0x40) /* LM78-J */
635 client_name = "lm78";
636 else if ((i & 0xfe) == 0xc0)
637 client_name = "lm79";
641 if (lm78_alias_detect(client, i)) {
642 dev_dbg(&adapter->dev,
643 "Device at 0x%02x appears to be the same as ISA device\n",
649 mutex_unlock(&isa->update_lock);
651 strlcpy(info->type, client_name, I2C_NAME_SIZE);
657 mutex_unlock(&isa->update_lock);
661 static int lm78_i2c_probe(struct i2c_client *client,
662 const struct i2c_device_id *id)
664 struct lm78_data *data;
667 data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL);
671 i2c_set_clientdata(client, data);
672 data->client = client;
673 data->type = id->driver_data;
675 /* Initialize the LM78 chip */
676 lm78_init_device(data);
678 /* Register sysfs hooks */
679 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
683 data->hwmon_dev = hwmon_device_register(&client->dev);
684 if (IS_ERR(data->hwmon_dev)) {
685 err = PTR_ERR(data->hwmon_dev);
692 sysfs_remove_group(&client->dev.kobj, &lm78_group);
696 static int lm78_i2c_remove(struct i2c_client *client)
698 struct lm78_data *data = i2c_get_clientdata(client);
700 hwmon_device_unregister(data->hwmon_dev);
701 sysfs_remove_group(&client->dev.kobj, &lm78_group);
706 static const struct i2c_device_id lm78_i2c_id[] = {
711 MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
713 static struct i2c_driver lm78_driver = {
714 .class = I2C_CLASS_HWMON,
718 .probe = lm78_i2c_probe,
719 .remove = lm78_i2c_remove,
720 .id_table = lm78_i2c_id,
721 .detect = lm78_i2c_detect,
722 .address_list = normal_i2c,
726 * The SMBus locks itself, but ISA access must be locked explicitly!
727 * We don't want to lock the whole ISA bus, so we lock each client
729 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
730 * would slow down the LM78 access and should not be necessary.
732 static int lm78_read_value(struct lm78_data *data, u8 reg)
734 struct i2c_client *client = data->client;
737 if (!client) { /* ISA device */
739 mutex_lock(&data->lock);
740 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
741 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
742 mutex_unlock(&data->lock);
746 return i2c_smbus_read_byte_data(client, reg);
749 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
751 struct i2c_client *client = data->client;
754 if (!client) { /* ISA device */
755 mutex_lock(&data->lock);
756 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
757 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
758 mutex_unlock(&data->lock);
762 return i2c_smbus_write_byte_data(client, reg, value);
765 static void lm78_init_device(struct lm78_data *data)
770 /* Start monitoring */
771 config = lm78_read_value(data, LM78_REG_CONFIG);
772 if ((config & 0x09) != 0x01)
773 lm78_write_value(data, LM78_REG_CONFIG,
774 (config & 0xf7) | 0x01);
776 /* A few vars need to be filled upon startup */
777 for (i = 0; i < 3; i++) {
778 data->fan_min[i] = lm78_read_value(data,
779 LM78_REG_FAN_MIN(i));
782 mutex_init(&data->update_lock);
785 static struct lm78_data *lm78_update_device(struct device *dev)
787 struct lm78_data *data = dev_get_drvdata(dev);
790 mutex_lock(&data->update_lock);
792 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
795 dev_dbg(dev, "Starting lm78 update\n");
797 for (i = 0; i <= 6; i++) {
799 lm78_read_value(data, LM78_REG_IN(i));
801 lm78_read_value(data, LM78_REG_IN_MIN(i));
803 lm78_read_value(data, LM78_REG_IN_MAX(i));
805 for (i = 0; i < 3; i++) {
807 lm78_read_value(data, LM78_REG_FAN(i));
809 lm78_read_value(data, LM78_REG_FAN_MIN(i));
811 data->temp = lm78_read_value(data, LM78_REG_TEMP);
813 lm78_read_value(data, LM78_REG_TEMP_OVER);
815 lm78_read_value(data, LM78_REG_TEMP_HYST);
816 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
817 data->vid = i & 0x0f;
818 if (data->type == lm79)
820 (lm78_read_value(data, LM78_REG_CHIPID) &
824 data->fan_div[0] = (i >> 4) & 0x03;
825 data->fan_div[1] = i >> 6;
826 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
827 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
828 data->last_updated = jiffies;
831 data->fan_div[2] = 1;
834 mutex_unlock(&data->update_lock);
840 static int lm78_isa_probe(struct platform_device *pdev)
843 struct lm78_data *data;
844 struct resource *res;
846 /* Reserve the ISA region */
847 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
848 if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET,
852 data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL);
856 mutex_init(&data->lock);
857 data->isa_addr = res->start;
858 platform_set_drvdata(pdev, data);
860 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
868 /* Initialize the LM78 chip */
869 lm78_init_device(data);
871 /* Register sysfs hooks */
872 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
874 goto exit_remove_files;
875 err = device_create_file(&pdev->dev, &dev_attr_name);
877 goto exit_remove_files;
879 data->hwmon_dev = hwmon_device_register(&pdev->dev);
880 if (IS_ERR(data->hwmon_dev)) {
881 err = PTR_ERR(data->hwmon_dev);
882 goto exit_remove_files;
888 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
889 device_remove_file(&pdev->dev, &dev_attr_name);
893 static int lm78_isa_remove(struct platform_device *pdev)
895 struct lm78_data *data = platform_get_drvdata(pdev);
897 hwmon_device_unregister(data->hwmon_dev);
898 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
899 device_remove_file(&pdev->dev, &dev_attr_name);
904 static struct platform_driver lm78_isa_driver = {
906 .owner = THIS_MODULE,
909 .probe = lm78_isa_probe,
910 .remove = lm78_isa_remove,
913 /* return 1 if a supported chip is found, 0 otherwise */
914 static int __init lm78_isa_found(unsigned short address)
916 int val, save, found = 0;
920 * Some boards declare base+0 to base+7 as a PNP device, some base+4
921 * to base+7 and some base+5 to base+6. So we better request each port
922 * individually for the probing phase.
924 for (port = address; port < address + LM78_EXTENT; port++) {
925 if (!request_region(port, 1, "lm78")) {
926 pr_debug("Failed to request port 0x%x\n", port);
931 #define REALLY_SLOW_IO
933 * We need the timeouts for at least some LM78-like
934 * chips. But only if we read 'undefined' registers.
936 val = inb_p(address + 1);
937 if (inb_p(address + 2) != val
938 || inb_p(address + 3) != val
939 || inb_p(address + 7) != val)
941 #undef REALLY_SLOW_IO
944 * We should be able to change the 7 LSB of the address port. The
945 * MSB (busy flag) should be clear initially, set after the write.
947 save = inb_p(address + LM78_ADDR_REG_OFFSET);
951 outb_p(val, address + LM78_ADDR_REG_OFFSET);
952 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
953 outb_p(save, address + LM78_ADDR_REG_OFFSET);
957 /* We found a device, now see if it could be an LM78 */
958 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
959 val = inb_p(address + LM78_DATA_REG_OFFSET);
962 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
963 val = inb_p(address + LM78_DATA_REG_OFFSET);
964 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
967 /* The busy flag should be clear again */
968 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
971 /* Explicitly prevent the misdetection of Winbond chips */
972 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
973 val = inb_p(address + LM78_DATA_REG_OFFSET);
974 if (val == 0xa3 || val == 0x5c)
977 /* Explicitly prevent the misdetection of ITE chips */
978 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
979 val = inb_p(address + LM78_DATA_REG_OFFSET);
983 /* Determine the chip type */
984 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
985 val = inb_p(address + LM78_DATA_REG_OFFSET);
986 if (val == 0x00 || val == 0x20 /* LM78 */
987 || val == 0x40 /* LM78-J */
988 || (val & 0xfe) == 0xc0) /* LM79 */
992 pr_info("Found an %s chip at %#x\n",
993 val & 0x80 ? "LM79" : "LM78", (int)address);
996 for (port--; port >= address; port--)
997 release_region(port, 1);
1001 static int __init lm78_isa_device_add(unsigned short address)
1003 struct resource res = {
1005 .end = address + LM78_EXTENT - 1,
1007 .flags = IORESOURCE_IO,
1011 pdev = platform_device_alloc("lm78", address);
1014 pr_err("Device allocation failed\n");
1018 err = platform_device_add_resources(pdev, &res, 1);
1020 pr_err("Device resource addition failed (%d)\n", err);
1021 goto exit_device_put;
1024 err = platform_device_add(pdev);
1026 pr_err("Device addition failed (%d)\n", err);
1027 goto exit_device_put;
1033 platform_device_put(pdev);
1039 static int __init lm78_isa_register(void)
1043 if (lm78_isa_found(isa_address)) {
1044 res = platform_driver_register(&lm78_isa_driver);
1048 /* Sets global pdev as a side effect */
1049 res = lm78_isa_device_add(isa_address);
1051 goto exit_unreg_isa_driver;
1056 exit_unreg_isa_driver:
1057 platform_driver_unregister(&lm78_isa_driver);
1062 static void lm78_isa_unregister(void)
1065 platform_device_unregister(pdev);
1066 platform_driver_unregister(&lm78_isa_driver);
1069 #else /* !CONFIG_ISA */
1071 static int __init lm78_isa_register(void)
1076 static void lm78_isa_unregister(void)
1079 #endif /* CONFIG_ISA */
1081 static int __init sm_lm78_init(void)
1086 * We register the ISA device first, so that we can skip the
1087 * registration of an I2C interface to the same device.
1089 res = lm78_isa_register();
1093 res = i2c_add_driver(&lm78_driver);
1095 goto exit_unreg_isa_device;
1099 exit_unreg_isa_device:
1100 lm78_isa_unregister();
1105 static void __exit sm_lm78_exit(void)
1107 lm78_isa_unregister();
1108 i2c_del_driver(&lm78_driver);
1111 MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>");
1112 MODULE_DESCRIPTION("LM78/LM79 driver");
1113 MODULE_LICENSE("GPL");
1115 module_init(sm_lm78_init);
1116 module_exit(sm_lm78_exit);