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hwmon: (it87) Print proper names for the IT8771E and IT8772E
[linux-2.6-block.git] / drivers / hwmon / lm78.c
CommitLineData
1da177e4 1/*
9b03079f
GR		 2 * lm78.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
5 * Copyright (c) 2007, 2011 Jean Delvare <khali@linux-fr.org>
6 *
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.
11 *
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.
16 *
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.
20 */
1da177e4 21
ce47da74
JP		 22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
1da177e4
LT		 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>
943b0830 29#include <linux/hwmon.h>
19f673ed 30#include <linux/hwmon-vid.h>
247dde4c 31#include <linux/hwmon-sysfs.h>
943b0830 32#include <linux/err.h>
9a61bf63 33#include <linux/mutex.h>
1da177e4 34
90534c5c
JD		 35#ifdef CONFIG_ISA
36#include <linux/platform_device.h>
37#include <linux/ioport.h>
38#include <linux/io.h>
39#endif
c40769fe 40
1da177e4 41/* Addresses to scan */
25e9c86d
MH		 42static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
43 0x2e, 0x2f, I2C_CLIENT_END };
e5e9f44c 44enum chips { lm78, lm79 };
1da177e4
LT		 45
46/* Many LM78 constants specified below */
47
48/* Length of ISA address segment */
49#define LM78_EXTENT 8
50
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
54
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))
59
60#define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
61#define LM78_REG_FAN(nr) (0x28 + (nr))
62
63#define LM78_REG_TEMP 0x27
64#define LM78_REG_TEMP_OVER 0x39
65#define LM78_REG_TEMP_HYST 0x3a
66
67#define LM78_REG_ALARM1 0x41
68#define LM78_REG_ALARM2 0x42
69
70#define LM78_REG_VID_FANDIV 0x47
71
72#define LM78_REG_CONFIG 0x40
73#define LM78_REG_CHIPID 0x49
74#define LM78_REG_I2C_ADDR 0x48
75
76
9b03079f
GR		 77/*
78 * Conversions. Rounding and limit checking is only done on the TO_REG
79 * variants.
80 */
1da177e4 81
9b03079f
GR		 82/*
83 * IN: mV (0V to 4.08V)
84 * REG: 16mV/bit
85 */
1da177e4
LT		 86static inline u8 IN_TO_REG(unsigned long val)
87{
2a844c14 88 unsigned long nval = clamp_val(val, 0, 4080);
1da177e4
LT		 89 return (nval + 8) / 16;
90}
91#define IN_FROM_REG(val) ((val) * 16)
92
93static inline u8 FAN_TO_REG(long rpm, int div)
94{
95 if (rpm <= 0)
96 return 255;
3806b45b
DC		 97 if (rpm > 1350000)
98 return 1;
2a844c14 99 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
1da177e4
LT		 100}
101
102static inline int FAN_FROM_REG(u8 val, int div)
103{
9b03079f 104 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
1da177e4
LT		 105}
106
9b03079f
GR		 107/*
108 * TEMP: mC (-128C to +127C)
109 * REG: 1C/bit, two's complement
110 */
1da177e4
LT		 111static inline s8 TEMP_TO_REG(int val)
112{
2a844c14 113 int nval = clamp_val(val, -128000, 127000) ;
9b03079f 114 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
1da177e4
LT		 115}
116
117static inline int TEMP_FROM_REG(s8 val)
118{
119 return val * 1000;
120}
121
1da177e4
LT		 122#define DIV_FROM_REG(val) (1 << (val))
123
1da177e4 124struct lm78_data {
0c6e9731 125 struct i2c_client *client;
1beeffe4 126 struct device *hwmon_dev;
9a61bf63 127 struct mutex lock;
1da177e4
LT		 128 enum chips type;
129
6e1b5029
JD		 130 /* For ISA device only */
131 const char *name;
132 int isa_addr;
133
9a61bf63 134 struct mutex update_lock;
1da177e4
LT		 135 char valid; /* !=0 if following fields are valid */
136 unsigned long last_updated; /* In jiffies */
137
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 */
149};
150
151
c59cc301
JD		 152static int lm78_read_value(struct lm78_data *data, u8 reg);
153static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
1da177e4 154static struct lm78_data *lm78_update_device(struct device *dev);
c59cc301 155static void lm78_init_device(struct lm78_data *data);
1da177e4
LT		 156
157
1da177e4 158/* 7 Voltages */
247dde4c
JD		 159static ssize_t show_in(struct device *dev, struct device_attribute *da,
160 char *buf)
1da177e4 161{
247dde4c 162 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 163 struct lm78_data *data = lm78_update_device(dev);
247dde4c 164 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
1da177e4
LT		 165}
166
247dde4c
JD		 167static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
168 char *buf)
1da177e4 169{
247dde4c 170 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 171 struct lm78_data *data = lm78_update_device(dev);
247dde4c 172 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
1da177e4
LT		 173}
174
247dde4c
JD		 175static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
176 char *buf)
1da177e4 177{
247dde4c 178 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 179 struct lm78_data *data = lm78_update_device(dev);
247dde4c 180 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
1da177e4
LT		 181}
182
247dde4c
JD		 183static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
184 const char *buf, size_t count)
1da177e4 185{
247dde4c 186 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 187 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 188 int nr = attr->index;
9b03079f
GR		 189 unsigned long val;
190 int err;
191
192 err = kstrtoul(buf, 10, &val);
193 if (err)
194 return err;
1da177e4 195
9a61bf63 196 mutex_lock(&data->update_lock);
1da177e4 197 data->in_min[nr] = IN_TO_REG(val);
c59cc301 198 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
9a61bf63 199 mutex_unlock(&data->update_lock);
1da177e4
LT		 200 return count;
201}
202
247dde4c
JD		 203static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
204 const char *buf, size_t count)
1da177e4 205{
247dde4c 206 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 207 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 208 int nr = attr->index;
9b03079f
GR		 209 unsigned long val;
210 int err;
211
212 err = kstrtoul(buf, 10, &val);
213 if (err)
214 return err;
1da177e4 215
9a61bf63 216 mutex_lock(&data->update_lock);
1da177e4 217 data->in_max[nr] = IN_TO_REG(val);
c59cc301 218 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
9a61bf63 219 mutex_unlock(&data->update_lock);
1da177e4
LT		 220 return count;
221}
9b03079f 222
1da177e4 223#define show_in_offset(offset) \
247dde4c
JD		 224static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
225 show_in, NULL, offset); \
226static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
227 show_in_min, set_in_min, offset); \
228static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
229 show_in_max, set_in_max, offset);
1da177e4
LT		 230
231show_in_offset(0);
232show_in_offset(1);
233show_in_offset(2);
234show_in_offset(3);
235show_in_offset(4);
236show_in_offset(5);
237show_in_offset(6);
238
239/* Temperature */
247dde4c
JD		 240static ssize_t show_temp(struct device *dev, struct device_attribute *da,
241 char *buf)
1da177e4
LT		 242{
243 struct lm78_data *data = lm78_update_device(dev);
244 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
245}
246
247dde4c
JD		 247static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
248 char *buf)
1da177e4
LT		 249{
250 struct lm78_data *data = lm78_update_device(dev);
251 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
252}
253
247dde4c
JD		 254static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
255 const char *buf, size_t count)
1da177e4 256{
c40769fe 257 struct lm78_data *data = dev_get_drvdata(dev);
9b03079f
GR		 258 long val;
259 int err;
260
261 err = kstrtol(buf, 10, &val);
262 if (err)
263 return err;
1da177e4 264
9a61bf63 265 mutex_lock(&data->update_lock);
1da177e4 266 data->temp_over = TEMP_TO_REG(val);
c59cc301 267 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
9a61bf63 268 mutex_unlock(&data->update_lock);
1da177e4
LT		 269 return count;
270}
271
247dde4c
JD		 272static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
273 char *buf)
1da177e4
LT		 274{
275 struct lm78_data *data = lm78_update_device(dev);
276 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
277}
278
247dde4c
JD		 279static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
280 const char *buf, size_t count)
1da177e4 281{
c40769fe 282 struct lm78_data *data = dev_get_drvdata(dev);
9b03079f
GR		 283 long val;
284 int err;
285
286 err = kstrtol(buf, 10, &val);
287 if (err)
288 return err;
1da177e4 289
9a61bf63 290 mutex_lock(&data->update_lock);
1da177e4 291 data->temp_hyst = TEMP_TO_REG(val);
c59cc301 292 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
9a61bf63 293 mutex_unlock(&data->update_lock);
1da177e4
LT		 294 return count;
295}
296
297static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
298static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
299 show_temp_over, set_temp_over);
300static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
301 show_temp_hyst, set_temp_hyst);
302
303/* 3 Fans */
247dde4c
JD		 304static ssize_t show_fan(struct device *dev, struct device_attribute *da,
305 char *buf)
1da177e4 306{
247dde4c 307 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 308 struct lm78_data *data = lm78_update_device(dev);
247dde4c 309 int nr = attr->index;
1da177e4 310 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
9b03079f 311 DIV_FROM_REG(data->fan_div[nr])));
1da177e4
LT		 312}
313
247dde4c
JD		 314static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
315 char *buf)
1da177e4 316{
247dde4c 317 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 318 struct lm78_data *data = lm78_update_device(dev);
247dde4c 319 int nr = attr->index;
9b03079f
GR		 320 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
321 DIV_FROM_REG(data->fan_div[nr])));
1da177e4
LT		 322}
323
247dde4c
JD		 324static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
325 const char *buf, size_t count)
1da177e4 326{
247dde4c 327 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 328 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 329 int nr = attr->index;
9b03079f
GR		 330 unsigned long val;
331 int err;
332
333 err = kstrtoul(buf, 10, &val);
334 if (err)
335 return err;
1da177e4 336
9a61bf63 337 mutex_lock(&data->update_lock);
1da177e4 338 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
c59cc301 339 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
9a61bf63 340 mutex_unlock(&data->update_lock);
1da177e4
LT		 341 return count;
342}
343
247dde4c
JD		 344static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
345 char *buf)
1da177e4 346{
247dde4c 347 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 348 struct lm78_data *data = lm78_update_device(dev);
247dde4c 349 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
1da177e4
LT		 350}
351
9b03079f
GR		 352/*
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.
357 */
247dde4c
JD		 358static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
359 const char *buf, size_t count)
1da177e4 360{
247dde4c 361 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 362 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 363 int nr = attr->index;
1da177e4
LT		 364 unsigned long min;
365 u8 reg;
9b03079f
GR		 366 unsigned long val;
367 int err;
368
369 err = kstrtoul(buf, 10, &val);
370 if (err)
371 return err;
1da177e4 372
9a61bf63 373 mutex_lock(&data->update_lock);
1da177e4
LT		 374 min = FAN_FROM_REG(data->fan_min[nr],
375 DIV_FROM_REG(data->fan_div[nr]));
376
377 switch (val) {
9b03079f
GR		 378 case 1:
379 data->fan_div[nr] = 0;
380 break;
381 case 2:
382 data->fan_div[nr] = 1;
383 break;
384 case 4:
385 data->fan_div[nr] = 2;
386 break;
387 case 8:
388 data->fan_div[nr] = 3;
389 break;
1da177e4 390 default:
b55f3757
GR		 391 dev_err(dev,
392 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
393 val);
9a61bf63 394 mutex_unlock(&data->update_lock);
1da177e4
LT		 395 return -EINVAL;
396 }
397
c59cc301 398 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
1da177e4
LT		 399 switch (nr) {
400 case 0:
401 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
402 break;
403 case 1:
404 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
405 break;
406 }
c59cc301 407 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
1da177e4
LT		 408
409 data->fan_min[nr] =
410 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
c59cc301 411 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
9a61bf63 412 mutex_unlock(&data->update_lock);
1da177e4
LT		 413
414 return count;
415}
416
247dde4c
JD		 417#define show_fan_offset(offset) \
418static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
419 show_fan, NULL, offset - 1); \
420static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
421 show_fan_min, set_fan_min, offset - 1);
1da177e4
LT		 422
423show_fan_offset(1);
424show_fan_offset(2);
425show_fan_offset(3);
426
427/* Fan 3 divisor is locked in H/W */
247dde4c
JD		 428static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
429 show_fan_div, set_fan_div, 0);
430static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
431 show_fan_div, set_fan_div, 1);
432static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
1da177e4
LT		 433
434/* VID */
247dde4c
JD		 435static ssize_t show_vid(struct device *dev, struct device_attribute *da,
436 char *buf)
1da177e4
LT		 437{
438 struct lm78_data *data = lm78_update_device(dev);
d0d3cd69 439 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
1da177e4
LT		 440}
441static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
442
443/* Alarms */
247dde4c
JD		 444static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
445 char *buf)
1da177e4
LT		 446{
447 struct lm78_data *data = lm78_update_device(dev);
448 return sprintf(buf, "%u\n", data->alarms);
449}
450static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
451
428a7039
JD		 452static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
453 char *buf)
454{
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);
458}
459static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
460static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
461static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
462static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
463static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
464static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
465static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
466static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
467static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
468static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
469static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
470
c1685f61 471static struct attribute *lm78_attributes[] = {
247dde4c
JD		 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,
428a7039 475 &sensor_dev_attr_in0_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 479 &sensor_dev_attr_in1_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 483 &sensor_dev_attr_in2_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 487 &sensor_dev_attr_in3_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 491 &sensor_dev_attr_in4_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 495 &sensor_dev_attr_in5_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 499 &sensor_dev_attr_in6_alarm.dev_attr.attr,
c1685f61
MH		 500 &dev_attr_temp1_input.attr,
501 &dev_attr_temp1_max.attr,
502 &dev_attr_temp1_max_hyst.attr,
428a7039 503 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 507 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 511 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
247dde4c
JD		 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,
428a7039 515 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
c1685f61
MH		 516 &dev_attr_alarms.attr,
517 &dev_attr_cpu0_vid.attr,
518
519 NULL
520};
521
522static const struct attribute_group lm78_group = {
523 .attrs = lm78_attributes,
524};
525
90534c5c
JD		 526/*
527 * ISA related code
528 */
529#ifdef CONFIG_ISA
530
531/* ISA device, if found */
532static struct platform_device *pdev;
533
534static unsigned short isa_address = 0x290;
535
9b03079f
GR		 536/*
537 * I2C devices get this name attribute automatically, but for ISA devices
538 * we must create it by ourselves.
539 */
c40769fe
JD		 540static ssize_t show_name(struct device *dev, struct device_attribute
541 *devattr, char *buf)
542{
543 struct lm78_data *data = dev_get_drvdata(dev);
544
6e1b5029 545 return sprintf(buf, "%s\n", data->name);
c40769fe
JD		 546}
547static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
548
90534c5c
JD		 549static struct lm78_data *lm78_data_if_isa(void)
550{
551 return pdev ? platform_get_drvdata(pdev) : NULL;
552}
553
18c73f90
JD		 554/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
555static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
556{
0c6e9731 557 struct lm78_data *isa;
18c73f90
JD		 558 int i;
559
560 if (!pdev) /* No ISA chip */
561 return 0;
18c73f90
JD		 562 isa = platform_get_drvdata(pdev);
563
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 */
568
9b03079f
GR		 569 /*
570 * We compare all the limit registers, the config register and the
571 * interrupt mask registers
572 */
18c73f90 573 for (i = 0x2b; i <= 0x3d; i++) {
0c6e9731
JD		 574 if (lm78_read_value(isa, i) !=
575 i2c_smbus_read_byte_data(client, i))
18c73f90
JD		 576 return 0;
577 }
578 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
0c6e9731 579 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
18c73f90
JD		 580 return 0;
581 for (i = 0x43; i <= 0x46; i++) {
0c6e9731
JD		 582 if (lm78_read_value(isa, i) !=
583 i2c_smbus_read_byte_data(client, i))
18c73f90
JD		 584 return 0;
585 }
586
587 return 1;
588}
90534c5c
JD		 589#else /* !CONFIG_ISA */
590
591static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
592{
593 return 0;
594}
595
596static struct lm78_data *lm78_data_if_isa(void)
597{
598 return NULL;
599}
600#endif /* CONFIG_ISA */
18c73f90 601
310ec792 602static int lm78_i2c_detect(struct i2c_client *client,
0c6e9731 603 struct i2c_board_info *info)
1da177e4 604{
0c6e9731 605 int i;
90534c5c 606 struct lm78_data *isa = lm78_data_if_isa();
0c6e9731
JD		 607 const char *client_name;
608 struct i2c_adapter *adapter = client->adapter;
609 int address = client->addr;
1da177e4 610
0c6e9731
JD		 611 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
612 return -ENODEV;
1da177e4 613
9b03079f
GR		 614 /*
615 * We block updates of the ISA device to minimize the risk of
616 * concurrent access to the same LM78 chip through different
617 * interfaces.
618 */
0c6e9731
JD		 619 if (isa)
620 mutex_lock(&isa->update_lock);
1da177e4 621
52df6440
JD		 622 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
623 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
624 goto err_nodev;
625
626 /* Explicitly prevent the misdetection of Winbond chips */
627 i = i2c_smbus_read_byte_data(client, 0x4f);
628 if (i == 0xa3 || i == 0x5c)
629 goto err_nodev;
1da177e4
LT		 630
631 /* Determine the chip type. */
52df6440
JD		 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";
638 else
639 goto err_nodev;
640
641 if (lm78_alias_detect(client, i)) {
b55f3757
GR		 642 dev_dbg(&adapter->dev,
643 "Device at 0x%02x appears to be the same as ISA device\n",
644 address);
52df6440 645 goto err_nodev;
1da177e4
LT		 646 }
647
0c6e9731
JD		 648 if (isa)
649 mutex_unlock(&isa->update_lock);
650
0c6e9731 651 strlcpy(info->type, client_name, I2C_NAME_SIZE);
1da177e4 652
0c6e9731 653 return 0;
1da177e4 654
0c6e9731
JD		 655 err_nodev:
656 if (isa)
657 mutex_unlock(&isa->update_lock);
658 return -ENODEV;
659}
660
661static int lm78_i2c_probe(struct i2c_client *client,
662 const struct i2c_device_id *id)
663{
664 struct lm78_data *data;
665 int err;
666
7b7bb90c 667 data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL);
0c6e9731
JD		 668 if (!data)
669 return -ENOMEM;
670
671 i2c_set_clientdata(client, data);
672 data->client = client;
673 data->type = id->driver_data;
1da177e4
LT		 674
675 /* Initialize the LM78 chip */
c59cc301 676 lm78_init_device(data);
1da177e4 677
1da177e4 678 /* Register sysfs hooks */
0c6e9731
JD		 679 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
680 if (err)
7b7bb90c 681 return err;
c1685f61 682
0c6e9731 683 data->hwmon_dev = hwmon_device_register(&client->dev);
1beeffe4
TJ		 684 if (IS_ERR(data->hwmon_dev)) {
685 err = PTR_ERR(data->hwmon_dev);
7b7bb90c 686 goto error;
943b0830
MH		 687 }
688
1da177e4
LT		 689 return 0;
690
7b7bb90c 691error:
0c6e9731 692 sysfs_remove_group(&client->dev.kobj, &lm78_group);
1da177e4
LT		 693 return err;
694}
695
0c6e9731 696static int lm78_i2c_remove(struct i2c_client *client)
1da177e4 697{
943b0830 698 struct lm78_data *data = i2c_get_clientdata(client);
1da177e4 699
1beeffe4 700 hwmon_device_unregister(data->hwmon_dev);
c1685f61 701 sysfs_remove_group(&client->dev.kobj, &lm78_group);
c40769fe
JD		 702
703 return 0;
704}
705
ed4cebdf
JD		 706static const struct i2c_device_id lm78_i2c_id[] = {
707 { "lm78", lm78 },
708 { "lm79", lm79 },
709 { }
710};
711MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
6e1b5029 712
ed4cebdf
JD		 713static struct i2c_driver lm78_driver = {
714 .class = I2C_CLASS_HWMON,
715 .driver = {
716 .name = "lm78",
717 },
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,
723};
1da177e4 724
9b03079f
GR		 725/*
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
728 * separately.
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.
731 */
c59cc301 732static int lm78_read_value(struct lm78_data *data, u8 reg)
1da177e4 733{
0c6e9731 734 struct i2c_client *client = data->client;
c59cc301 735
90534c5c 736#ifdef CONFIG_ISA
0c6e9731 737 if (!client) { /* ISA device */
c59cc301 738 int res;
9a61bf63 739 mutex_lock(&data->lock);
6e1b5029
JD		 740 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
741 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
9a61bf63 742 mutex_unlock(&data->lock);
1da177e4
LT		 743 return res;
744 } else
90534c5c 745#endif
1da177e4
LT		 746 return i2c_smbus_read_byte_data(client, reg);
747}
748
c59cc301 749static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
1da177e4 750{
0c6e9731 751 struct i2c_client *client = data->client;
c59cc301 752
90534c5c 753#ifdef CONFIG_ISA
0c6e9731 754 if (!client) { /* ISA device */
9a61bf63 755 mutex_lock(&data->lock);
6e1b5029
JD		 756 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
757 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
9a61bf63 758 mutex_unlock(&data->lock);
1da177e4
LT		 759 return 0;
760 } else
90534c5c 761#endif
1da177e4
LT		 762 return i2c_smbus_write_byte_data(client, reg, value);
763}
764
c59cc301 765static void lm78_init_device(struct lm78_data *data)
1da177e4 766{
c40769fe
JD		 767 u8 config;
768 int i;
1da177e4
LT		 769
770 /* Start monitoring */
c59cc301 771 config = lm78_read_value(data, LM78_REG_CONFIG);
c40769fe 772 if ((config & 0x09) != 0x01)
c59cc301 773 lm78_write_value(data, LM78_REG_CONFIG,
1da177e4 774 (config & 0xf7) | 0x01);
c40769fe
JD		 775
776 /* A few vars need to be filled upon startup */
777 for (i = 0; i < 3; i++) {
c59cc301 778 data->fan_min[i] = lm78_read_value(data,
c40769fe
JD		 779 LM78_REG_FAN_MIN(i));
780 }
781
782 mutex_init(&data->update_lock);
1da177e4
LT		 783}
784
785static struct lm78_data *lm78_update_device(struct device *dev)
786{
c40769fe 787 struct lm78_data *data = dev_get_drvdata(dev);
1da177e4
LT		 788 int i;
789
9a61bf63 790 mutex_lock(&data->update_lock);
1da177e4
LT		 791
792 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
793 || !data->valid) {
794
c40769fe 795 dev_dbg(dev, "Starting lm78 update\n");
1da177e4
LT		 796
797 for (i = 0; i <= 6; i++) {
798 data->in[i] =
c59cc301 799 lm78_read_value(data, LM78_REG_IN(i));
1da177e4 800 data->in_min[i] =
c59cc301 801 lm78_read_value(data, LM78_REG_IN_MIN(i));
1da177e4 802 data->in_max[i] =
c59cc301 803 lm78_read_value(data, LM78_REG_IN_MAX(i));
1da177e4
LT		 804 }
805 for (i = 0; i < 3; i++) {
806 data->fan[i] =
c59cc301 807 lm78_read_value(data, LM78_REG_FAN(i));
1da177e4 808 data->fan_min[i] =
c59cc301 809 lm78_read_value(data, LM78_REG_FAN_MIN(i));
1da177e4 810 }
c59cc301 811 data->temp = lm78_read_value(data, LM78_REG_TEMP);
1da177e4 812 data->temp_over =
c59cc301 813 lm78_read_value(data, LM78_REG_TEMP_OVER);
1da177e4 814 data->temp_hyst =
c59cc301
JD		 815 lm78_read_value(data, LM78_REG_TEMP_HYST);
816 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
1da177e4
LT		 817 data->vid = i & 0x0f;
818 if (data->type == lm79)
819 data->vid |=
c59cc301 820 (lm78_read_value(data, LM78_REG_CHIPID) &
1da177e4
LT		 821 0x01) << 4;
822 else
823 data->vid |= 0x10;
824 data->fan_div[0] = (i >> 4) & 0x03;
825 data->fan_div[1] = i >> 6;
c59cc301
JD		 826 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
827 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
1da177e4
LT		 828 data->last_updated = jiffies;
829 data->valid = 1;
830
831 data->fan_div[2] = 1;
832 }
833
9a61bf63 834 mutex_unlock(&data->update_lock);
1da177e4
LT		 835
836 return data;
837}
838
90534c5c 839#ifdef CONFIG_ISA
6c931ae1 840static int lm78_isa_probe(struct platform_device *pdev)
ed4cebdf
JD		 841{
842 int err;
843 struct lm78_data *data;
844 struct resource *res;
845
846 /* Reserve the ISA region */
847 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
7b7bb90c
GR		 848 if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET,
849 2, "lm78"))
850 return -EBUSY;
851
852 data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL);
853 if (!data)
854 return -ENOMEM;
ed4cebdf 855
ed4cebdf
JD		 856 mutex_init(&data->lock);
857 data->isa_addr = res->start;
858 platform_set_drvdata(pdev, data);
859
860 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
861 data->type = lm79;
862 data->name = "lm79";
863 } else {
864 data->type = lm78;
865 data->name = "lm78";
866 }
867
868 /* Initialize the LM78 chip */
869 lm78_init_device(data);
870
871 /* Register sysfs hooks */
9b03079f
GR		 872 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
873 if (err)
874 goto exit_remove_files;
875 err = device_create_file(&pdev->dev, &dev_attr_name);
876 if (err)
ed4cebdf
JD		 877 goto exit_remove_files;
878
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;
883 }
884
885 return 0;
886
887 exit_remove_files:
888 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
889 device_remove_file(&pdev->dev, &dev_attr_name);
ed4cebdf
JD		 890 return err;
891}
892
281dfd0b 893static int lm78_isa_remove(struct platform_device *pdev)
ed4cebdf
JD		 894{
895 struct lm78_data *data = platform_get_drvdata(pdev);
ed4cebdf
JD		 896
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);
ed4cebdf
JD		 900
901 return 0;
902}
903
904static struct platform_driver lm78_isa_driver = {
905 .driver = {
906 .owner = THIS_MODULE,
907 .name = "lm78",
908 },
909 .probe = lm78_isa_probe,
9e5e9b7a 910 .remove = lm78_isa_remove,
ed4cebdf
JD		 911};
912
c40769fe
JD		 913/* return 1 if a supported chip is found, 0 otherwise */
914static int __init lm78_isa_found(unsigned short address)
915{
916 int val, save, found = 0;
197027e6
JD		 917 int port;
918
9b03079f
GR		 919 /*
920 * Some boards declare base+0 to base+7 as a PNP device, some base+4
197027e6 921 * to base+7 and some base+5 to base+6. So we better request each port
9b03079f
GR		 922 * individually for the probing phase.
923 */
197027e6
JD		 924 for (port = address; port < address + LM78_EXTENT; port++) {
925 if (!request_region(port, 1, "lm78")) {
ce47da74 926 pr_debug("Failed to request port 0x%x\n", port);
197027e6
JD		 927 goto release;
928 }
47c15532 929 }
c40769fe
JD		 930
931#define REALLY_SLOW_IO
9b03079f
GR		 932 /*
933 * We need the timeouts for at least some LM78-like
934 * chips. But only if we read 'undefined' registers.
935 */
c40769fe
JD		 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)
940 goto release;
941#undef REALLY_SLOW_IO
942
9b03079f
GR		 943 /*
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.
946 */
c40769fe
JD		 947 save = inb_p(address + LM78_ADDR_REG_OFFSET);
948 if (save & 0x80)
949 goto release;
950 val = ~save & 0x7f;
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);
954 goto release;
955 }
956
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);
960 if (val & 0x80)
961 goto release;
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 */
965 goto release;
966
967 /* The busy flag should be clear again */
968 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
969 goto release;
970
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)
975 goto release;
976
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);
980 if (val == 0x90)
981 goto release;
982
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);
acf346a3 986 if (val == 0x00 || val == 0x20 /* LM78 */
c40769fe
JD		 987 || val == 0x40 /* LM78-J */
988 || (val & 0xfe) == 0xc0) /* LM79 */
989 found = 1;
990
991 if (found)
ce47da74 992 pr_info("Found an %s chip at %#x\n",
c40769fe
JD		 993 val & 0x80 ? "LM79" : "LM78", (int)address);
994
995 release:
197027e6
JD		 996 for (port--; port >= address; port--)
997 release_region(port, 1);
c40769fe
JD		 998 return found;
999}
1000
1001static int __init lm78_isa_device_add(unsigned short address)
1002{
1003 struct resource res = {
1004 .start = address,
15bde2f1 1005 .end = address + LM78_EXTENT - 1,
c40769fe
JD		 1006 .name = "lm78",
1007 .flags = IORESOURCE_IO,
1008 };
1009 int err;
1010
1011 pdev = platform_device_alloc("lm78", address);
1012 if (!pdev) {
1013 err = -ENOMEM;
ce47da74 1014 pr_err("Device allocation failed\n");
c40769fe
JD		 1015 goto exit;
1016 }
1017
1018 err = platform_device_add_resources(pdev, &res, 1);
1019 if (err) {
ce47da74 1020 pr_err("Device resource addition failed (%d)\n", err);
c40769fe
JD		 1021 goto exit_device_put;
1022 }
1023
1024 err = platform_device_add(pdev);
1025 if (err) {
ce47da74 1026 pr_err("Device addition failed (%d)\n", err);
c40769fe
JD		 1027 goto exit_device_put;
1028 }
1029
1030 return 0;
1031
1032 exit_device_put:
1033 platform_device_put(pdev);
1034 exit:
1035 pdev = NULL;
1036 return err;
1037}
1038
90534c5c 1039static int __init lm78_isa_register(void)
1da177e4 1040{
fde09509
JD		 1041 int res;
1042
c40769fe
JD		 1043 if (lm78_isa_found(isa_address)) {
1044 res = platform_driver_register(&lm78_isa_driver);
1045 if (res)
18c73f90 1046 goto exit;
fde09509 1047
c40769fe
JD		 1048 /* Sets global pdev as a side effect */
1049 res = lm78_isa_device_add(isa_address);
1050 if (res)
1051 goto exit_unreg_isa_driver;
1052 }
fde09509
JD		 1053
1054 return 0;
c40769fe
JD		 1055
1056 exit_unreg_isa_driver:
1057 platform_driver_unregister(&lm78_isa_driver);
c40769fe
JD		 1058 exit:
1059 return res;
1da177e4
LT		 1060}
1061
90534c5c 1062static void lm78_isa_unregister(void)
1da177e4 1063{
c40769fe
JD		 1064 if (pdev) {
1065 platform_device_unregister(pdev);
1066 platform_driver_unregister(&lm78_isa_driver);
1067 }
90534c5c
JD		 1068}
1069#else /* !CONFIG_ISA */
1070
1071static int __init lm78_isa_register(void)
1072{
1073 return 0;
1074}
1075
1076static void lm78_isa_unregister(void)
1077{
1078}
1079#endif /* CONFIG_ISA */
1080
1081static int __init sm_lm78_init(void)
1082{
1083 int res;
1084
9b03079f
GR		 1085 /*
1086 * We register the ISA device first, so that we can skip the
1087 * registration of an I2C interface to the same device.
1088 */
90534c5c
JD		 1089 res = lm78_isa_register();
1090 if (res)
1091 goto exit;
1092
1093 res = i2c_add_driver(&lm78_driver);
1094 if (res)
1095 goto exit_unreg_isa_device;
1096
1097 return 0;
1098
1099 exit_unreg_isa_device:
1100 lm78_isa_unregister();
1101 exit:
1102 return res;
1103}
1104
1105static void __exit sm_lm78_exit(void)
1106{
1107 lm78_isa_unregister();
1da177e4
LT		 1108 i2c_del_driver(&lm78_driver);
1109}
1110
156e2d1a 1111MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>");
27fe048e 1112MODULE_DESCRIPTION("LM78/LM79 driver");
1da177e4
LT		 1113MODULE_LICENSE("GPL");
1114
1115module_init(sm_lm78_init);
1116module_exit(sm_lm78_exit);
Linux 6.x block layer and io_uring tree(s)