2 * lm78.c - Part of lm_sensors, Linux kernel modules for hardware
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;
390 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
392 mutex_unlock(&data->update_lock);
396 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
399 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
402 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
405 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
408 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
409 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
410 mutex_unlock(&data->update_lock);
415 #define show_fan_offset(offset) \
416 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
417 show_fan, NULL, offset - 1); \
418 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
419 show_fan_min, set_fan_min, offset - 1);
425 /* Fan 3 divisor is locked in H/W */
426 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
427 show_fan_div, set_fan_div, 0);
428 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
429 show_fan_div, set_fan_div, 1);
430 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
433 static ssize_t show_vid(struct device *dev, struct device_attribute *da,
436 struct lm78_data *data = lm78_update_device(dev);
437 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
439 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
442 static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
445 struct lm78_data *data = lm78_update_device(dev);
446 return sprintf(buf, "%u\n", data->alarms);
448 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
450 static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
453 struct lm78_data *data = lm78_update_device(dev);
454 int nr = to_sensor_dev_attr(da)->index;
455 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
457 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
458 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
459 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
460 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
461 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
462 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
463 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
464 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
465 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
466 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
467 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
469 static struct attribute *lm78_attributes[] = {
470 &sensor_dev_attr_in0_input.dev_attr.attr,
471 &sensor_dev_attr_in0_min.dev_attr.attr,
472 &sensor_dev_attr_in0_max.dev_attr.attr,
473 &sensor_dev_attr_in0_alarm.dev_attr.attr,
474 &sensor_dev_attr_in1_input.dev_attr.attr,
475 &sensor_dev_attr_in1_min.dev_attr.attr,
476 &sensor_dev_attr_in1_max.dev_attr.attr,
477 &sensor_dev_attr_in1_alarm.dev_attr.attr,
478 &sensor_dev_attr_in2_input.dev_attr.attr,
479 &sensor_dev_attr_in2_min.dev_attr.attr,
480 &sensor_dev_attr_in2_max.dev_attr.attr,
481 &sensor_dev_attr_in2_alarm.dev_attr.attr,
482 &sensor_dev_attr_in3_input.dev_attr.attr,
483 &sensor_dev_attr_in3_min.dev_attr.attr,
484 &sensor_dev_attr_in3_max.dev_attr.attr,
485 &sensor_dev_attr_in3_alarm.dev_attr.attr,
486 &sensor_dev_attr_in4_input.dev_attr.attr,
487 &sensor_dev_attr_in4_min.dev_attr.attr,
488 &sensor_dev_attr_in4_max.dev_attr.attr,
489 &sensor_dev_attr_in4_alarm.dev_attr.attr,
490 &sensor_dev_attr_in5_input.dev_attr.attr,
491 &sensor_dev_attr_in5_min.dev_attr.attr,
492 &sensor_dev_attr_in5_max.dev_attr.attr,
493 &sensor_dev_attr_in5_alarm.dev_attr.attr,
494 &sensor_dev_attr_in6_input.dev_attr.attr,
495 &sensor_dev_attr_in6_min.dev_attr.attr,
496 &sensor_dev_attr_in6_max.dev_attr.attr,
497 &sensor_dev_attr_in6_alarm.dev_attr.attr,
498 &dev_attr_temp1_input.attr,
499 &dev_attr_temp1_max.attr,
500 &dev_attr_temp1_max_hyst.attr,
501 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
502 &sensor_dev_attr_fan1_input.dev_attr.attr,
503 &sensor_dev_attr_fan1_min.dev_attr.attr,
504 &sensor_dev_attr_fan1_div.dev_attr.attr,
505 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
506 &sensor_dev_attr_fan2_input.dev_attr.attr,
507 &sensor_dev_attr_fan2_min.dev_attr.attr,
508 &sensor_dev_attr_fan2_div.dev_attr.attr,
509 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
510 &sensor_dev_attr_fan3_input.dev_attr.attr,
511 &sensor_dev_attr_fan3_min.dev_attr.attr,
512 &sensor_dev_attr_fan3_div.dev_attr.attr,
513 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
514 &dev_attr_alarms.attr,
515 &dev_attr_cpu0_vid.attr,
520 static const struct attribute_group lm78_group = {
521 .attrs = lm78_attributes,
529 /* ISA device, if found */
530 static struct platform_device *pdev;
532 static unsigned short isa_address = 0x290;
535 * I2C devices get this name attribute automatically, but for ISA devices
536 * we must create it by ourselves.
538 static ssize_t show_name(struct device *dev, struct device_attribute
541 struct lm78_data *data = dev_get_drvdata(dev);
543 return sprintf(buf, "%s\n", data->name);
545 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
547 static struct lm78_data *lm78_data_if_isa(void)
549 return pdev ? platform_get_drvdata(pdev) : NULL;
552 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
553 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
555 struct lm78_data *isa;
558 if (!pdev) /* No ISA chip */
560 isa = platform_get_drvdata(pdev);
562 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
563 return 0; /* Address doesn't match */
564 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
565 return 0; /* Chip type doesn't match */
568 * We compare all the limit registers, the config register and the
569 * interrupt mask registers
571 for (i = 0x2b; i <= 0x3d; i++) {
572 if (lm78_read_value(isa, i) !=
573 i2c_smbus_read_byte_data(client, i))
576 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
577 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
579 for (i = 0x43; i <= 0x46; i++) {
580 if (lm78_read_value(isa, i) !=
581 i2c_smbus_read_byte_data(client, i))
587 #else /* !CONFIG_ISA */
589 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
594 static struct lm78_data *lm78_data_if_isa(void)
598 #endif /* CONFIG_ISA */
600 static int lm78_i2c_detect(struct i2c_client *client,
601 struct i2c_board_info *info)
604 struct lm78_data *isa = lm78_data_if_isa();
605 const char *client_name;
606 struct i2c_adapter *adapter = client->adapter;
607 int address = client->addr;
609 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
613 * We block updates of the ISA device to minimize the risk of
614 * concurrent access to the same LM78 chip through different
618 mutex_lock(&isa->update_lock);
620 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
621 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
624 /* Explicitly prevent the misdetection of Winbond chips */
625 i = i2c_smbus_read_byte_data(client, 0x4f);
626 if (i == 0xa3 || i == 0x5c)
629 /* Determine the chip type. */
630 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
631 if (i == 0x00 || i == 0x20 /* LM78 */
632 || i == 0x40) /* LM78-J */
633 client_name = "lm78";
634 else if ((i & 0xfe) == 0xc0)
635 client_name = "lm79";
639 if (lm78_alias_detect(client, i)) {
640 dev_dbg(&adapter->dev,
641 "Device at 0x%02x appears to be the same as ISA device\n",
647 mutex_unlock(&isa->update_lock);
649 strlcpy(info->type, client_name, I2C_NAME_SIZE);
655 mutex_unlock(&isa->update_lock);
659 static int lm78_i2c_probe(struct i2c_client *client,
660 const struct i2c_device_id *id)
662 struct lm78_data *data;
665 data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL);
669 i2c_set_clientdata(client, data);
670 data->client = client;
671 data->type = id->driver_data;
673 /* Initialize the LM78 chip */
674 lm78_init_device(data);
676 /* Register sysfs hooks */
677 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
681 data->hwmon_dev = hwmon_device_register(&client->dev);
682 if (IS_ERR(data->hwmon_dev)) {
683 err = PTR_ERR(data->hwmon_dev);
690 sysfs_remove_group(&client->dev.kobj, &lm78_group);
694 static int lm78_i2c_remove(struct i2c_client *client)
696 struct lm78_data *data = i2c_get_clientdata(client);
698 hwmon_device_unregister(data->hwmon_dev);
699 sysfs_remove_group(&client->dev.kobj, &lm78_group);
704 static const struct i2c_device_id lm78_i2c_id[] = {
709 MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
711 static struct i2c_driver lm78_driver = {
712 .class = I2C_CLASS_HWMON,
716 .probe = lm78_i2c_probe,
717 .remove = lm78_i2c_remove,
718 .id_table = lm78_i2c_id,
719 .detect = lm78_i2c_detect,
720 .address_list = normal_i2c,
724 * The SMBus locks itself, but ISA access must be locked explicitly!
725 * We don't want to lock the whole ISA bus, so we lock each client
727 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
728 * would slow down the LM78 access and should not be necessary.
730 static int lm78_read_value(struct lm78_data *data, u8 reg)
732 struct i2c_client *client = data->client;
735 if (!client) { /* ISA device */
737 mutex_lock(&data->lock);
738 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
739 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
740 mutex_unlock(&data->lock);
744 return i2c_smbus_read_byte_data(client, reg);
747 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
749 struct i2c_client *client = data->client;
752 if (!client) { /* ISA device */
753 mutex_lock(&data->lock);
754 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
755 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
756 mutex_unlock(&data->lock);
760 return i2c_smbus_write_byte_data(client, reg, value);
763 static void lm78_init_device(struct lm78_data *data)
768 /* Start monitoring */
769 config = lm78_read_value(data, LM78_REG_CONFIG);
770 if ((config & 0x09) != 0x01)
771 lm78_write_value(data, LM78_REG_CONFIG,
772 (config & 0xf7) | 0x01);
774 /* A few vars need to be filled upon startup */
775 for (i = 0; i < 3; i++) {
776 data->fan_min[i] = lm78_read_value(data,
777 LM78_REG_FAN_MIN(i));
780 mutex_init(&data->update_lock);
783 static struct lm78_data *lm78_update_device(struct device *dev)
785 struct lm78_data *data = dev_get_drvdata(dev);
788 mutex_lock(&data->update_lock);
790 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
793 dev_dbg(dev, "Starting lm78 update\n");
795 for (i = 0; i <= 6; i++) {
797 lm78_read_value(data, LM78_REG_IN(i));
799 lm78_read_value(data, LM78_REG_IN_MIN(i));
801 lm78_read_value(data, LM78_REG_IN_MAX(i));
803 for (i = 0; i < 3; i++) {
805 lm78_read_value(data, LM78_REG_FAN(i));
807 lm78_read_value(data, LM78_REG_FAN_MIN(i));
809 data->temp = lm78_read_value(data, LM78_REG_TEMP);
811 lm78_read_value(data, LM78_REG_TEMP_OVER);
813 lm78_read_value(data, LM78_REG_TEMP_HYST);
814 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
815 data->vid = i & 0x0f;
816 if (data->type == lm79)
818 (lm78_read_value(data, LM78_REG_CHIPID) &
822 data->fan_div[0] = (i >> 4) & 0x03;
823 data->fan_div[1] = i >> 6;
824 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
825 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
826 data->last_updated = jiffies;
829 data->fan_div[2] = 1;
832 mutex_unlock(&data->update_lock);
838 static int lm78_isa_probe(struct platform_device *pdev)
841 struct lm78_data *data;
842 struct resource *res;
844 /* Reserve the ISA region */
845 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
846 if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET,
850 data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL);
854 mutex_init(&data->lock);
855 data->isa_addr = res->start;
856 platform_set_drvdata(pdev, data);
858 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
866 /* Initialize the LM78 chip */
867 lm78_init_device(data);
869 /* Register sysfs hooks */
870 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
872 goto exit_remove_files;
873 err = device_create_file(&pdev->dev, &dev_attr_name);
875 goto exit_remove_files;
877 data->hwmon_dev = hwmon_device_register(&pdev->dev);
878 if (IS_ERR(data->hwmon_dev)) {
879 err = PTR_ERR(data->hwmon_dev);
880 goto exit_remove_files;
886 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
887 device_remove_file(&pdev->dev, &dev_attr_name);
891 static int lm78_isa_remove(struct platform_device *pdev)
893 struct lm78_data *data = platform_get_drvdata(pdev);
895 hwmon_device_unregister(data->hwmon_dev);
896 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
897 device_remove_file(&pdev->dev, &dev_attr_name);
902 static struct platform_driver lm78_isa_driver = {
904 .owner = THIS_MODULE,
907 .probe = lm78_isa_probe,
908 .remove = lm78_isa_remove,
911 /* return 1 if a supported chip is found, 0 otherwise */
912 static int __init lm78_isa_found(unsigned short address)
914 int val, save, found = 0;
918 * Some boards declare base+0 to base+7 as a PNP device, some base+4
919 * to base+7 and some base+5 to base+6. So we better request each port
920 * individually for the probing phase.
922 for (port = address; port < address + LM78_EXTENT; port++) {
923 if (!request_region(port, 1, "lm78")) {
924 pr_debug("Failed to request port 0x%x\n", port);
929 #define REALLY_SLOW_IO
931 * We need the timeouts for at least some LM78-like
932 * chips. But only if we read 'undefined' registers.
934 val = inb_p(address + 1);
935 if (inb_p(address + 2) != val
936 || inb_p(address + 3) != val
937 || inb_p(address + 7) != val)
939 #undef REALLY_SLOW_IO
942 * We should be able to change the 7 LSB of the address port. The
943 * MSB (busy flag) should be clear initially, set after the write.
945 save = inb_p(address + LM78_ADDR_REG_OFFSET);
949 outb_p(val, address + LM78_ADDR_REG_OFFSET);
950 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
951 outb_p(save, address + LM78_ADDR_REG_OFFSET);
955 /* We found a device, now see if it could be an LM78 */
956 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
957 val = inb_p(address + LM78_DATA_REG_OFFSET);
960 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
961 val = inb_p(address + LM78_DATA_REG_OFFSET);
962 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
965 /* The busy flag should be clear again */
966 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
969 /* Explicitly prevent the misdetection of Winbond chips */
970 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
971 val = inb_p(address + LM78_DATA_REG_OFFSET);
972 if (val == 0xa3 || val == 0x5c)
975 /* Explicitly prevent the misdetection of ITE chips */
976 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
977 val = inb_p(address + LM78_DATA_REG_OFFSET);
981 /* Determine the chip type */
982 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
983 val = inb_p(address + LM78_DATA_REG_OFFSET);
984 if (val == 0x00 || val == 0x20 /* LM78 */
985 || val == 0x40 /* LM78-J */
986 || (val & 0xfe) == 0xc0) /* LM79 */
990 pr_info("Found an %s chip at %#x\n",
991 val & 0x80 ? "LM79" : "LM78", (int)address);
994 for (port--; port >= address; port--)
995 release_region(port, 1);
999 static int __init lm78_isa_device_add(unsigned short address)
1001 struct resource res = {
1003 .end = address + LM78_EXTENT - 1,
1005 .flags = IORESOURCE_IO,
1009 pdev = platform_device_alloc("lm78", address);
1012 pr_err("Device allocation failed\n");
1016 err = platform_device_add_resources(pdev, &res, 1);
1018 pr_err("Device resource addition failed (%d)\n", err);
1019 goto exit_device_put;
1022 err = platform_device_add(pdev);
1024 pr_err("Device addition failed (%d)\n", err);
1025 goto exit_device_put;
1031 platform_device_put(pdev);
1037 static int __init lm78_isa_register(void)
1041 if (lm78_isa_found(isa_address)) {
1042 res = platform_driver_register(&lm78_isa_driver);
1046 /* Sets global pdev as a side effect */
1047 res = lm78_isa_device_add(isa_address);
1049 goto exit_unreg_isa_driver;
1054 exit_unreg_isa_driver:
1055 platform_driver_unregister(&lm78_isa_driver);
1060 static void lm78_isa_unregister(void)
1063 platform_device_unregister(pdev);
1064 platform_driver_unregister(&lm78_isa_driver);
1067 #else /* !CONFIG_ISA */
1069 static int __init lm78_isa_register(void)
1074 static void lm78_isa_unregister(void)
1077 #endif /* CONFIG_ISA */
1079 static int __init sm_lm78_init(void)
1084 * We register the ISA device first, so that we can skip the
1085 * registration of an I2C interface to the same device.
1087 res = lm78_isa_register();
1091 res = i2c_add_driver(&lm78_driver);
1093 goto exit_unreg_isa_device;
1097 exit_unreg_isa_device:
1098 lm78_isa_unregister();
1103 static void __exit sm_lm78_exit(void)
1105 lm78_isa_unregister();
1106 i2c_del_driver(&lm78_driver);
1110 MODULE_DESCRIPTION("LM78/LM79 driver");
1111 MODULE_LICENSE("GPL");
1113 module_init(sm_lm78_init);
1114 module_exit(sm_lm78_exit);