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Merge tag 'dmaengine-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul...
[linux-block.git] / drivers / hwmon / lm78.c
CommitLineData
74ba9207 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 2/*
9b03079f
GR		 3 * lm78.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
7c81c60f 6 * Copyright (c) 2007, 2011 Jean Delvare <jdelvare@suse.de>
9b03079f 7 */
1da177e4 8
ce47da74
JP		 9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
1da177e4
LT		 11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/jiffies.h>
15#include <linux/i2c.h>
943b0830 16#include <linux/hwmon.h>
19f673ed 17#include <linux/hwmon-vid.h>
247dde4c 18#include <linux/hwmon-sysfs.h>
943b0830 19#include <linux/err.h>
9a61bf63 20#include <linux/mutex.h>
1da177e4 21
90534c5c
JD		 22#ifdef CONFIG_ISA
23#include <linux/platform_device.h>
24#include <linux/ioport.h>
25#include <linux/io.h>
26#endif
c40769fe 27
1da177e4 28/* Addresses to scan */
25e9c86d
MH		 29static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
30 0x2e, 0x2f, I2C_CLIENT_END };
e5e9f44c 31enum chips { lm78, lm79 };
1da177e4
LT		 32
33/* Many LM78 constants specified below */
34
35/* Length of ISA address segment */
36#define LM78_EXTENT 8
37
38/* Where are the ISA address/data registers relative to the base address */
39#define LM78_ADDR_REG_OFFSET 5
40#define LM78_DATA_REG_OFFSET 6
41
42/* The LM78 registers */
43#define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
44#define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
45#define LM78_REG_IN(nr) (0x20 + (nr))
46
47#define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
48#define LM78_REG_FAN(nr) (0x28 + (nr))
49
50#define LM78_REG_TEMP 0x27
51#define LM78_REG_TEMP_OVER 0x39
52#define LM78_REG_TEMP_HYST 0x3a
53
54#define LM78_REG_ALARM1 0x41
55#define LM78_REG_ALARM2 0x42
56
57#define LM78_REG_VID_FANDIV 0x47
58
59#define LM78_REG_CONFIG 0x40
60#define LM78_REG_CHIPID 0x49
61#define LM78_REG_I2C_ADDR 0x48
62
9b03079f
GR		 63/*
64 * Conversions. Rounding and limit checking is only done on the TO_REG
65 * variants.
66 */
1da177e4 67
9b03079f
GR		 68/*
69 * IN: mV (0V to 4.08V)
70 * REG: 16mV/bit
71 */
1da177e4
LT		 72static inline u8 IN_TO_REG(unsigned long val)
73{
2a844c14 74 unsigned long nval = clamp_val(val, 0, 4080);
1da177e4
LT		 75 return (nval + 8) / 16;
76}
77#define IN_FROM_REG(val) ((val) * 16)
78
79static inline u8 FAN_TO_REG(long rpm, int div)
80{
81 if (rpm <= 0)
82 return 255;
3806b45b
DC		 83 if (rpm > 1350000)
84 return 1;
2a844c14 85 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
1da177e4
LT		 86}
87
88static inline int FAN_FROM_REG(u8 val, int div)
89{
9b03079f 90 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
1da177e4
LT		 91}
92
9b03079f
GR		 93/*
94 * TEMP: mC (-128C to +127C)
95 * REG: 1C/bit, two's complement
96 */
1074d683 97static inline s8 TEMP_TO_REG(long val)
1da177e4 98{
2a844c14 99 int nval = clamp_val(val, -128000, 127000) ;
9b03079f 100 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
1da177e4
LT		 101}
102
103static inline int TEMP_FROM_REG(s8 val)
104{
105 return val * 1000;
106}
107
1da177e4
LT		 108#define DIV_FROM_REG(val) (1 << (val))
109
1da177e4 110struct lm78_data {
0c6e9731 111 struct i2c_client *client;
9a61bf63 112 struct mutex lock;
1da177e4
LT		 113 enum chips type;
114
6e1b5029
JD		 115 /* For ISA device only */
116 const char *name;
117 int isa_addr;
118
9a61bf63 119 struct mutex update_lock;
952a11ca 120 bool valid; /* true if following fields are valid */
1da177e4
LT		 121 unsigned long last_updated; /* In jiffies */
122
123 u8 in[7]; /* Register value */
124 u8 in_max[7]; /* Register value */
125 u8 in_min[7]; /* Register value */
126 u8 fan[3]; /* Register value */
127 u8 fan_min[3]; /* Register value */
128 s8 temp; /* Register value */
129 s8 temp_over; /* Register value */
130 s8 temp_hyst; /* Register value */
131 u8 fan_div[3]; /* Register encoding, shifted right */
132 u8 vid; /* Register encoding, combined */
133 u16 alarms; /* Register encoding, combined */
134};
135
c59cc301
JD		 136static int lm78_read_value(struct lm78_data *data, u8 reg);
137static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
1da177e4 138static struct lm78_data *lm78_update_device(struct device *dev);
c59cc301 139static void lm78_init_device(struct lm78_data *data);
1da177e4 140
1da177e4 141/* 7 Voltages */
e7655cfd 142static ssize_t in_show(struct device *dev, struct device_attribute *da,
247dde4c 143 char *buf)
1da177e4 144{
247dde4c 145 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 146 struct lm78_data *data = lm78_update_device(dev);
247dde4c 147 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
1da177e4
LT		 148}
149
e7655cfd 150static ssize_t in_min_show(struct device *dev, struct device_attribute *da,
247dde4c 151 char *buf)
1da177e4 152{
247dde4c 153 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 154 struct lm78_data *data = lm78_update_device(dev);
247dde4c 155 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
1da177e4
LT		 156}
157
e7655cfd 158static ssize_t in_max_show(struct device *dev, struct device_attribute *da,
247dde4c 159 char *buf)
1da177e4 160{
247dde4c 161 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 162 struct lm78_data *data = lm78_update_device(dev);
247dde4c 163 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
1da177e4
LT		 164}
165
e7655cfd
GR		 166static ssize_t in_min_store(struct device *dev, struct device_attribute *da,
167 const char *buf, size_t count)
1da177e4 168{
247dde4c 169 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 170 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 171 int nr = attr->index;
9b03079f
GR		 172 unsigned long val;
173 int err;
174
175 err = kstrtoul(buf, 10, &val);
176 if (err)
177 return err;
1da177e4 178
9a61bf63 179 mutex_lock(&data->update_lock);
1da177e4 180 data->in_min[nr] = IN_TO_REG(val);
c59cc301 181 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
9a61bf63 182 mutex_unlock(&data->update_lock);
1da177e4
LT		 183 return count;
184}
185
e7655cfd
GR		 186static ssize_t in_max_store(struct device *dev, struct device_attribute *da,
187 const char *buf, size_t count)
1da177e4 188{
247dde4c 189 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 190 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 191 int nr = attr->index;
9b03079f
GR		 192 unsigned long val;
193 int err;
194
195 err = kstrtoul(buf, 10, &val);
196 if (err)
197 return err;
1da177e4 198
9a61bf63 199 mutex_lock(&data->update_lock);
1da177e4 200 data->in_max[nr] = IN_TO_REG(val);
c59cc301 201 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
9a61bf63 202 mutex_unlock(&data->update_lock);
1da177e4
LT		 203 return count;
204}
9b03079f 205
e7655cfd
GR		 206static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
207static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
208static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
209static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
210static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
211static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
212static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
213static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
214static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
215static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
216static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
217static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
218static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
219static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
220static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
221static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
222static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
223static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
224static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6);
225static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
226static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
1da177e4
LT		 227
228/* Temperature */
eabb6f15
JL		 229static ssize_t temp1_input_show(struct device *dev,
230 struct device_attribute *da, char *buf)
1da177e4
LT		 231{
232 struct lm78_data *data = lm78_update_device(dev);
233 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
234}
235
eabb6f15 236static ssize_t temp1_max_show(struct device *dev, struct device_attribute *da,
247dde4c 237 char *buf)
1da177e4
LT		 238{
239 struct lm78_data *data = lm78_update_device(dev);
240 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
241}
242
eabb6f15
JL		 243static ssize_t temp1_max_store(struct device *dev,
244 struct device_attribute *da, const char *buf,
245 size_t count)
1da177e4 246{
c40769fe 247 struct lm78_data *data = dev_get_drvdata(dev);
9b03079f
GR		 248 long val;
249 int err;
250
251 err = kstrtol(buf, 10, &val);
252 if (err)
253 return err;
1da177e4 254
9a61bf63 255 mutex_lock(&data->update_lock);
1da177e4 256 data->temp_over = TEMP_TO_REG(val);
c59cc301 257 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
9a61bf63 258 mutex_unlock(&data->update_lock);
1da177e4
LT		 259 return count;
260}
261
eabb6f15
JL		 262static ssize_t temp1_max_hyst_show(struct device *dev,
263 struct device_attribute *da, char *buf)
1da177e4
LT		 264{
265 struct lm78_data *data = lm78_update_device(dev);
266 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
267}
268
eabb6f15
JL		 269static ssize_t temp1_max_hyst_store(struct device *dev,
270 struct device_attribute *da,
271 const char *buf, size_t count)
1da177e4 272{
c40769fe 273 struct lm78_data *data = dev_get_drvdata(dev);
9b03079f
GR		 274 long val;
275 int err;
276
277 err = kstrtol(buf, 10, &val);
278 if (err)
279 return err;
1da177e4 280
9a61bf63 281 mutex_lock(&data->update_lock);
1da177e4 282 data->temp_hyst = TEMP_TO_REG(val);
c59cc301 283 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
9a61bf63 284 mutex_unlock(&data->update_lock);
1da177e4
LT		 285 return count;
286}
287
eabb6f15
JL		 288static DEVICE_ATTR_RO(temp1_input);
289static DEVICE_ATTR_RW(temp1_max);
290static DEVICE_ATTR_RW(temp1_max_hyst);
1da177e4
LT		 291
292/* 3 Fans */
e7655cfd 293static ssize_t fan_show(struct device *dev, struct device_attribute *da,
247dde4c 294 char *buf)
1da177e4 295{
247dde4c 296 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 297 struct lm78_data *data = lm78_update_device(dev);
247dde4c 298 int nr = attr->index;
1da177e4 299 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
9b03079f 300 DIV_FROM_REG(data->fan_div[nr])));
1da177e4
LT		 301}
302
e7655cfd 303static ssize_t fan_min_show(struct device *dev, struct device_attribute *da,
247dde4c 304 char *buf)
1da177e4 305{
247dde4c 306 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 307 struct lm78_data *data = lm78_update_device(dev);
247dde4c 308 int nr = attr->index;
9b03079f
GR		 309 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
310 DIV_FROM_REG(data->fan_div[nr])));
1da177e4
LT		 311}
312
e7655cfd
GR		 313static ssize_t fan_min_store(struct device *dev, struct device_attribute *da,
314 const char *buf, size_t count)
1da177e4 315{
247dde4c 316 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 317 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 318 int nr = attr->index;
9b03079f
GR		 319 unsigned long val;
320 int err;
321
322 err = kstrtoul(buf, 10, &val);
323 if (err)
324 return err;
1da177e4 325
9a61bf63 326 mutex_lock(&data->update_lock);
1da177e4 327 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
c59cc301 328 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
9a61bf63 329 mutex_unlock(&data->update_lock);
1da177e4
LT		 330 return count;
331}
332
e7655cfd 333static ssize_t fan_div_show(struct device *dev, struct device_attribute *da,
247dde4c 334 char *buf)
1da177e4 335{
247dde4c 336 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
1da177e4 337 struct lm78_data *data = lm78_update_device(dev);
247dde4c 338 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
1da177e4
LT		 339}
340
9b03079f
GR		 341/*
342 * Note: we save and restore the fan minimum here, because its value is
343 * determined in part by the fan divisor. This follows the principle of
344 * least surprise; the user doesn't expect the fan minimum to change just
345 * because the divisor changed.
346 */
e7655cfd
GR		 347static ssize_t fan_div_store(struct device *dev, struct device_attribute *da,
348 const char *buf, size_t count)
1da177e4 349{
247dde4c 350 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
c40769fe 351 struct lm78_data *data = dev_get_drvdata(dev);
247dde4c 352 int nr = attr->index;
1da177e4
LT		 353 unsigned long min;
354 u8 reg;
9b03079f
GR		 355 unsigned long val;
356 int err;
357
358 err = kstrtoul(buf, 10, &val);
359 if (err)
360 return err;
1da177e4 361
9a61bf63 362 mutex_lock(&data->update_lock);
1da177e4
LT		 363 min = FAN_FROM_REG(data->fan_min[nr],
364 DIV_FROM_REG(data->fan_div[nr]));
365
366 switch (val) {
9b03079f
GR		 367 case 1:
368 data->fan_div[nr] = 0;
369 break;
370 case 2:
371 data->fan_div[nr] = 1;
372 break;
373 case 4:
374 data->fan_div[nr] = 2;
375 break;
376 case 8:
377 data->fan_div[nr] = 3;
378 break;
1da177e4 379 default:
b55f3757
GR		 380 dev_err(dev,
381 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
382 val);
9a61bf63 383 mutex_unlock(&data->update_lock);
1da177e4
LT		 384 return -EINVAL;
385 }
386
c59cc301 387 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
1da177e4
LT		 388 switch (nr) {
389 case 0:
390 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
391 break;
392 case 1:
393 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
394 break;
395 }
c59cc301 396 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
1da177e4
LT		 397
398 data->fan_min[nr] =
399 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
c59cc301 400 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
9a61bf63 401 mutex_unlock(&data->update_lock);
1da177e4
LT		 402
403 return count;
404}
405
e7655cfd
GR		 406static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
407static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
408static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
409static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
410static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
411static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
1da177e4
LT		 412
413/* Fan 3 divisor is locked in H/W */
e7655cfd
GR		 414static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
415static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
416static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2);
1da177e4
LT		 417
418/* VID */
eabb6f15
JL		 419static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *da,
420 char *buf)
1da177e4
LT		 421{
422 struct lm78_data *data = lm78_update_device(dev);
d0d3cd69 423 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
1da177e4 424}
eabb6f15 425static DEVICE_ATTR_RO(cpu0_vid);
1da177e4
LT		 426
427/* Alarms */
eabb6f15 428static ssize_t alarms_show(struct device *dev, struct device_attribute *da,
247dde4c 429 char *buf)
1da177e4
LT		 430{
431 struct lm78_data *data = lm78_update_device(dev);
432 return sprintf(buf, "%u\n", data->alarms);
433}
eabb6f15 434static DEVICE_ATTR_RO(alarms);
1da177e4 435
e7655cfd 436static ssize_t alarm_show(struct device *dev, struct device_attribute *da,
428a7039
JD		 437 char *buf)
438{
439 struct lm78_data *data = lm78_update_device(dev);
440 int nr = to_sensor_dev_attr(da)->index;
441 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
442}
e7655cfd
GR		 443static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
444static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
445static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
446static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
447static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
448static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
449static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10);
450static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
451static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
452static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11);
453static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
428a7039 454
8eb40610 455static struct attribute *lm78_attrs[] = {
247dde4c
JD		 456 &sensor_dev_attr_in0_input.dev_attr.attr,
457 &sensor_dev_attr_in0_min.dev_attr.attr,
458 &sensor_dev_attr_in0_max.dev_attr.attr,
428a7039 459 &sensor_dev_attr_in0_alarm.dev_attr.attr,
247dde4c
JD		 460 &sensor_dev_attr_in1_input.dev_attr.attr,
461 &sensor_dev_attr_in1_min.dev_attr.attr,
462 &sensor_dev_attr_in1_max.dev_attr.attr,
428a7039 463 &sensor_dev_attr_in1_alarm.dev_attr.attr,
247dde4c
JD		 464 &sensor_dev_attr_in2_input.dev_attr.attr,
465 &sensor_dev_attr_in2_min.dev_attr.attr,
466 &sensor_dev_attr_in2_max.dev_attr.attr,
428a7039 467 &sensor_dev_attr_in2_alarm.dev_attr.attr,
247dde4c
JD		 468 &sensor_dev_attr_in3_input.dev_attr.attr,
469 &sensor_dev_attr_in3_min.dev_attr.attr,
470 &sensor_dev_attr_in3_max.dev_attr.attr,
428a7039 471 &sensor_dev_attr_in3_alarm.dev_attr.attr,
247dde4c
JD		 472 &sensor_dev_attr_in4_input.dev_attr.attr,
473 &sensor_dev_attr_in4_min.dev_attr.attr,
474 &sensor_dev_attr_in4_max.dev_attr.attr,
428a7039 475 &sensor_dev_attr_in4_alarm.dev_attr.attr,
247dde4c
JD		 476 &sensor_dev_attr_in5_input.dev_attr.attr,
477 &sensor_dev_attr_in5_min.dev_attr.attr,
478 &sensor_dev_attr_in5_max.dev_attr.attr,
428a7039 479 &sensor_dev_attr_in5_alarm.dev_attr.attr,
247dde4c
JD		 480 &sensor_dev_attr_in6_input.dev_attr.attr,
481 &sensor_dev_attr_in6_min.dev_attr.attr,
482 &sensor_dev_attr_in6_max.dev_attr.attr,
428a7039 483 &sensor_dev_attr_in6_alarm.dev_attr.attr,
c1685f61
MH		 484 &dev_attr_temp1_input.attr,
485 &dev_attr_temp1_max.attr,
486 &dev_attr_temp1_max_hyst.attr,
428a7039 487 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
247dde4c
JD		 488 &sensor_dev_attr_fan1_input.dev_attr.attr,
489 &sensor_dev_attr_fan1_min.dev_attr.attr,
490 &sensor_dev_attr_fan1_div.dev_attr.attr,
428a7039 491 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
247dde4c
JD		 492 &sensor_dev_attr_fan2_input.dev_attr.attr,
493 &sensor_dev_attr_fan2_min.dev_attr.attr,
494 &sensor_dev_attr_fan2_div.dev_attr.attr,
428a7039 495 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
247dde4c
JD		 496 &sensor_dev_attr_fan3_input.dev_attr.attr,
497 &sensor_dev_attr_fan3_min.dev_attr.attr,
498 &sensor_dev_attr_fan3_div.dev_attr.attr,
428a7039 499 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
c1685f61
MH		 500 &dev_attr_alarms.attr,
501 &dev_attr_cpu0_vid.attr,
502
503 NULL
504};
505
8eb40610 506ATTRIBUTE_GROUPS(lm78);
c1685f61 507
90534c5c
JD		 508/*
509 * ISA related code
510 */
511#ifdef CONFIG_ISA
512
513/* ISA device, if found */
514static struct platform_device *pdev;
515
516static unsigned short isa_address = 0x290;
517
90534c5c
JD		 518static struct lm78_data *lm78_data_if_isa(void)
519{
520 return pdev ? platform_get_drvdata(pdev) : NULL;
521}
522
18c73f90
JD		 523/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
524static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
525{
0c6e9731 526 struct lm78_data *isa;
18c73f90
JD		 527 int i;
528
529 if (!pdev) /* No ISA chip */
530 return 0;
18c73f90
JD		 531 isa = platform_get_drvdata(pdev);
532
533 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
534 return 0; /* Address doesn't match */
535 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
536 return 0; /* Chip type doesn't match */
537
9b03079f
GR		 538 /*
539 * We compare all the limit registers, the config register and the
540 * interrupt mask registers
541 */
18c73f90 542 for (i = 0x2b; i <= 0x3d; i++) {
0c6e9731
JD		 543 if (lm78_read_value(isa, i) !=
544 i2c_smbus_read_byte_data(client, i))
18c73f90
JD		 545 return 0;
546 }
547 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
0c6e9731 548 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
18c73f90
JD		 549 return 0;
550 for (i = 0x43; i <= 0x46; i++) {
0c6e9731
JD		 551 if (lm78_read_value(isa, i) !=
552 i2c_smbus_read_byte_data(client, i))
18c73f90
JD		 553 return 0;
554 }
555
556 return 1;
557}
90534c5c
JD		 558#else /* !CONFIG_ISA */
559
560static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
561{
562 return 0;
563}
564
565static struct lm78_data *lm78_data_if_isa(void)
566{
567 return NULL;
568}
569#endif /* CONFIG_ISA */
18c73f90 570
310ec792 571static int lm78_i2c_detect(struct i2c_client *client,
0c6e9731 572 struct i2c_board_info *info)
1da177e4 573{
0c6e9731 574 int i;
90534c5c 575 struct lm78_data *isa = lm78_data_if_isa();
0c6e9731
JD		 576 const char *client_name;
577 struct i2c_adapter *adapter = client->adapter;
578 int address = client->addr;
1da177e4 579
0c6e9731
JD		 580 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
581 return -ENODEV;
1da177e4 582
9b03079f
GR		 583 /*
584 * We block updates of the ISA device to minimize the risk of
585 * concurrent access to the same LM78 chip through different
586 * interfaces.
587 */
0c6e9731
JD		 588 if (isa)
589 mutex_lock(&isa->update_lock);
1da177e4 590
52df6440
JD		 591 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
592 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
593 goto err_nodev;
594
595 /* Explicitly prevent the misdetection of Winbond chips */
596 i = i2c_smbus_read_byte_data(client, 0x4f);
597 if (i == 0xa3 || i == 0x5c)
598 goto err_nodev;
1da177e4
LT		 599
600 /* Determine the chip type. */
52df6440
JD		 601 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
602 if (i == 0x00 || i == 0x20 /* LM78 */
603 || i == 0x40) /* LM78-J */
604 client_name = "lm78";
605 else if ((i & 0xfe) == 0xc0)
606 client_name = "lm79";
607 else
608 goto err_nodev;
609
610 if (lm78_alias_detect(client, i)) {
b55f3757
GR		 611 dev_dbg(&adapter->dev,
612 "Device at 0x%02x appears to be the same as ISA device\n",
613 address);
52df6440 614 goto err_nodev;
1da177e4
LT		 615 }
616
0c6e9731
JD		 617 if (isa)
618 mutex_unlock(&isa->update_lock);
619
f2f394db 620 strscpy(info->type, client_name, I2C_NAME_SIZE);
1da177e4 621
0c6e9731 622 return 0;
1da177e4 623
0c6e9731
JD		 624 err_nodev:
625 if (isa)
626 mutex_unlock(&isa->update_lock);
627 return -ENODEV;
628}
629
67487038
SK		 630static const struct i2c_device_id lm78_i2c_id[];
631
632static int lm78_i2c_probe(struct i2c_client *client)
0c6e9731 633{
8eb40610
AL		 634 struct device *dev = &client->dev;
635 struct device *hwmon_dev;
0c6e9731 636 struct lm78_data *data;
0c6e9731 637
8eb40610 638 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
0c6e9731
JD		 639 if (!data)
640 return -ENOMEM;
641
0c6e9731 642 data->client = client;
67487038 643 data->type = i2c_match_id(lm78_i2c_id, client)->driver_data;
1da177e4
LT		 644
645 /* Initialize the LM78 chip */
c59cc301 646 lm78_init_device(data);
1da177e4 647
8eb40610
AL		 648 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
649 data, lm78_groups);
650 return PTR_ERR_OR_ZERO(hwmon_dev);
c40769fe
JD		 651}
652
ed4cebdf
JD		 653static const struct i2c_device_id lm78_i2c_id[] = {
654 { "lm78", lm78 },
655 { "lm79", lm79 },
656 { }
657};
658MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
6e1b5029 659
ed4cebdf
JD		 660static struct i2c_driver lm78_driver = {
661 .class = I2C_CLASS_HWMON,
662 .driver = {
663 .name = "lm78",
664 },
67487038 665 .probe_new = lm78_i2c_probe,
ed4cebdf
JD		 666 .id_table = lm78_i2c_id,
667 .detect = lm78_i2c_detect,
668 .address_list = normal_i2c,
669};
1da177e4 670
9b03079f
GR		 671/*
672 * The SMBus locks itself, but ISA access must be locked explicitly!
673 * We don't want to lock the whole ISA bus, so we lock each client
674 * separately.
675 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
676 * would slow down the LM78 access and should not be necessary.
677 */
c59cc301 678static int lm78_read_value(struct lm78_data *data, u8 reg)
1da177e4 679{
0c6e9731 680 struct i2c_client *client = data->client;
c59cc301 681
90534c5c 682#ifdef CONFIG_ISA
0c6e9731 683 if (!client) { /* ISA device */
c59cc301 684 int res;
9a61bf63 685 mutex_lock(&data->lock);
6e1b5029
JD		 686 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
687 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
9a61bf63 688 mutex_unlock(&data->lock);
1da177e4
LT		 689 return res;
690 } else
90534c5c 691#endif
1da177e4
LT		 692 return i2c_smbus_read_byte_data(client, reg);
693}
694
c59cc301 695static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
1da177e4 696{
0c6e9731 697 struct i2c_client *client = data->client;
c59cc301 698
90534c5c 699#ifdef CONFIG_ISA
0c6e9731 700 if (!client) { /* ISA device */
9a61bf63 701 mutex_lock(&data->lock);
6e1b5029
JD		 702 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
703 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
9a61bf63 704 mutex_unlock(&data->lock);
1da177e4
LT		 705 return 0;
706 } else
90534c5c 707#endif
1da177e4
LT		 708 return i2c_smbus_write_byte_data(client, reg, value);
709}
710
c59cc301 711static void lm78_init_device(struct lm78_data *data)
1da177e4 712{
c40769fe
JD		 713 u8 config;
714 int i;
1da177e4
LT		 715
716 /* Start monitoring */
c59cc301 717 config = lm78_read_value(data, LM78_REG_CONFIG);
c40769fe 718 if ((config & 0x09) != 0x01)
c59cc301 719 lm78_write_value(data, LM78_REG_CONFIG,
1da177e4 720 (config & 0xf7) | 0x01);
c40769fe
JD		 721
722 /* A few vars need to be filled upon startup */
723 for (i = 0; i < 3; i++) {
c59cc301 724 data->fan_min[i] = lm78_read_value(data,
c40769fe
JD		 725 LM78_REG_FAN_MIN(i));
726 }
727
728 mutex_init(&data->update_lock);
1da177e4
LT		 729}
730
731static struct lm78_data *lm78_update_device(struct device *dev)
732{
c40769fe 733 struct lm78_data *data = dev_get_drvdata(dev);
1da177e4
LT		 734 int i;
735
9a61bf63 736 mutex_lock(&data->update_lock);
1da177e4
LT		 737
738 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
739 || !data->valid) {
740
c40769fe 741 dev_dbg(dev, "Starting lm78 update\n");
1da177e4
LT		 742
743 for (i = 0; i <= 6; i++) {
744 data->in[i] =
c59cc301 745 lm78_read_value(data, LM78_REG_IN(i));
1da177e4 746 data->in_min[i] =
c59cc301 747 lm78_read_value(data, LM78_REG_IN_MIN(i));
1da177e4 748 data->in_max[i] =
c59cc301 749 lm78_read_value(data, LM78_REG_IN_MAX(i));
1da177e4
LT		 750 }
751 for (i = 0; i < 3; i++) {
752 data->fan[i] =
c59cc301 753 lm78_read_value(data, LM78_REG_FAN(i));
1da177e4 754 data->fan_min[i] =
c59cc301 755 lm78_read_value(data, LM78_REG_FAN_MIN(i));
1da177e4 756 }
c59cc301 757 data->temp = lm78_read_value(data, LM78_REG_TEMP);
1da177e4 758 data->temp_over =
c59cc301 759 lm78_read_value(data, LM78_REG_TEMP_OVER);
1da177e4 760 data->temp_hyst =
c59cc301
JD		 761 lm78_read_value(data, LM78_REG_TEMP_HYST);
762 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
1da177e4
LT		 763 data->vid = i & 0x0f;
764 if (data->type == lm79)
765 data->vid |=
c59cc301 766 (lm78_read_value(data, LM78_REG_CHIPID) &
1da177e4
LT		 767 0x01) << 4;
768 else
769 data->vid |= 0x10;
770 data->fan_div[0] = (i >> 4) & 0x03;
771 data->fan_div[1] = i >> 6;
c59cc301
JD		 772 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
773 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
1da177e4 774 data->last_updated = jiffies;
952a11ca 775 data->valid = true;
1da177e4
LT		 776
777 data->fan_div[2] = 1;
778 }
779
9a61bf63 780 mutex_unlock(&data->update_lock);
1da177e4
LT		 781
782 return data;
783}
784
90534c5c 785#ifdef CONFIG_ISA
6c931ae1 786static int lm78_isa_probe(struct platform_device *pdev)
ed4cebdf 787{
8eb40610
AL		 788 struct device *dev = &pdev->dev;
789 struct device *hwmon_dev;
ed4cebdf
JD		 790 struct lm78_data *data;
791 struct resource *res;
792
793 /* Reserve the ISA region */
794 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
8eb40610 795 if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET,
7b7bb90c
GR		 796 2, "lm78"))
797 return -EBUSY;
798
8eb40610 799 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
7b7bb90c
GR		 800 if (!data)
801 return -ENOMEM;
ed4cebdf 802
ed4cebdf
JD		 803 mutex_init(&data->lock);
804 data->isa_addr = res->start;
805 platform_set_drvdata(pdev, data);
806
807 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
808 data->type = lm79;
809 data->name = "lm79";
810 } else {
811 data->type = lm78;
812 data->name = "lm78";
813 }
814
815 /* Initialize the LM78 chip */
816 lm78_init_device(data);
817
8eb40610
AL		 818 hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
819 data, lm78_groups);
820 return PTR_ERR_OR_ZERO(hwmon_dev);
ed4cebdf
JD		 821}
822
823static struct platform_driver lm78_isa_driver = {
824 .driver = {
ed4cebdf
JD		 825 .name = "lm78",
826 },
827 .probe = lm78_isa_probe,
ed4cebdf
JD		 828};
829
c40769fe
JD		 830/* return 1 if a supported chip is found, 0 otherwise */
831static int __init lm78_isa_found(unsigned short address)
832{
833 int val, save, found = 0;
197027e6
JD		 834 int port;
835
9b03079f
GR		 836 /*
837 * Some boards declare base+0 to base+7 as a PNP device, some base+4
197027e6 838 * to base+7 and some base+5 to base+6. So we better request each port
9b03079f
GR		 839 * individually for the probing phase.
840 */
197027e6
JD		 841 for (port = address; port < address + LM78_EXTENT; port++) {
842 if (!request_region(port, 1, "lm78")) {
ce47da74 843 pr_debug("Failed to request port 0x%x\n", port);
197027e6
JD		 844 goto release;
845 }
47c15532 846 }
c40769fe
JD		 847
848#define REALLY_SLOW_IO
9b03079f
GR		 849 /*
850 * We need the timeouts for at least some LM78-like
851 * chips. But only if we read 'undefined' registers.
852 */
c40769fe
JD		 853 val = inb_p(address + 1);
854 if (inb_p(address + 2) != val
855 || inb_p(address + 3) != val
856 || inb_p(address + 7) != val)
857 goto release;
858#undef REALLY_SLOW_IO
859
9b03079f
GR		 860 /*
861 * We should be able to change the 7 LSB of the address port. The
862 * MSB (busy flag) should be clear initially, set after the write.
863 */
c40769fe
JD		 864 save = inb_p(address + LM78_ADDR_REG_OFFSET);
865 if (save & 0x80)
866 goto release;
867 val = ~save & 0x7f;
868 outb_p(val, address + LM78_ADDR_REG_OFFSET);
869 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
870 outb_p(save, address + LM78_ADDR_REG_OFFSET);
871 goto release;
872 }
873
874 /* We found a device, now see if it could be an LM78 */
875 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
876 val = inb_p(address + LM78_DATA_REG_OFFSET);
877 if (val & 0x80)
878 goto release;
879 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
880 val = inb_p(address + LM78_DATA_REG_OFFSET);
881 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
882 goto release;
883
884 /* The busy flag should be clear again */
885 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
886 goto release;
887
888 /* Explicitly prevent the misdetection of Winbond chips */
889 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
890 val = inb_p(address + LM78_DATA_REG_OFFSET);
891 if (val == 0xa3 || val == 0x5c)
892 goto release;
893
894 /* Explicitly prevent the misdetection of ITE chips */
895 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
896 val = inb_p(address + LM78_DATA_REG_OFFSET);
897 if (val == 0x90)
898 goto release;
899
900 /* Determine the chip type */
901 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
902 val = inb_p(address + LM78_DATA_REG_OFFSET);
acf346a3 903 if (val == 0x00 || val == 0x20 /* LM78 */
c40769fe
JD		 904 || val == 0x40 /* LM78-J */
905 || (val & 0xfe) == 0xc0) /* LM79 */
906 found = 1;
907
908 if (found)
ce47da74 909 pr_info("Found an %s chip at %#x\n",
c40769fe
JD		 910 val & 0x80 ? "LM79" : "LM78", (int)address);
911
912 release:
197027e6
JD		 913 for (port--; port >= address; port--)
914 release_region(port, 1);
c40769fe
JD		 915 return found;
916}
917
918static int __init lm78_isa_device_add(unsigned short address)
919{
920 struct resource res = {
921 .start = address,
15bde2f1 922 .end = address + LM78_EXTENT - 1,
c40769fe
JD		 923 .name = "lm78",
924 .flags = IORESOURCE_IO,
925 };
926 int err;
927
928 pdev = platform_device_alloc("lm78", address);
929 if (!pdev) {
930 err = -ENOMEM;
ce47da74 931 pr_err("Device allocation failed\n");
c40769fe
JD		 932 goto exit;
933 }
934
935 err = platform_device_add_resources(pdev, &res, 1);
936 if (err) {
ce47da74 937 pr_err("Device resource addition failed (%d)\n", err);
c40769fe
JD		 938 goto exit_device_put;
939 }
940
941 err = platform_device_add(pdev);
942 if (err) {
ce47da74 943 pr_err("Device addition failed (%d)\n", err);
c40769fe
JD		 944 goto exit_device_put;
945 }
946
947 return 0;
948
949 exit_device_put:
950 platform_device_put(pdev);
951 exit:
952 pdev = NULL;
953 return err;
954}
955
90534c5c 956static int __init lm78_isa_register(void)
1da177e4 957{
fde09509
JD		 958 int res;
959
c40769fe
JD		 960 if (lm78_isa_found(isa_address)) {
961 res = platform_driver_register(&lm78_isa_driver);
962 if (res)
18c73f90 963 goto exit;
fde09509 964
c40769fe
JD		 965 /* Sets global pdev as a side effect */
966 res = lm78_isa_device_add(isa_address);
967 if (res)
968 goto exit_unreg_isa_driver;
969 }
fde09509
JD		 970
971 return 0;
c40769fe
JD		 972
973 exit_unreg_isa_driver:
974 platform_driver_unregister(&lm78_isa_driver);
c40769fe
JD		 975 exit:
976 return res;
1da177e4
LT		 977}
978
90534c5c 979static void lm78_isa_unregister(void)
1da177e4 980{
c40769fe
JD		 981 if (pdev) {
982 platform_device_unregister(pdev);
983 platform_driver_unregister(&lm78_isa_driver);
984 }
90534c5c
JD		 985}
986#else /* !CONFIG_ISA */
987
988static int __init lm78_isa_register(void)
989{
990 return 0;
991}
992
993static void lm78_isa_unregister(void)
994{
995}
996#endif /* CONFIG_ISA */
997
998static int __init sm_lm78_init(void)
999{
1000 int res;
1001
9b03079f
GR		 1002 /*
1003 * We register the ISA device first, so that we can skip the
1004 * registration of an I2C interface to the same device.
1005 */
90534c5c
JD		 1006 res = lm78_isa_register();
1007 if (res)
1008 goto exit;
1009
1010 res = i2c_add_driver(&lm78_driver);
1011 if (res)
1012 goto exit_unreg_isa_device;
1013
1014 return 0;
1015
1016 exit_unreg_isa_device:
1017 lm78_isa_unregister();
1018 exit:
1019 return res;
1020}
1021
1022static void __exit sm_lm78_exit(void)
1023{
1024 lm78_isa_unregister();
1da177e4
LT		 1025 i2c_del_driver(&lm78_driver);
1026}
1027
7c81c60f 1028MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>");
27fe048e 1029MODULE_DESCRIPTION("LM78/LM79 driver");
1da177e4
LT		 1030MODULE_LICENSE("GPL");
1031
1032module_init(sm_lm78_init);
1033module_exit(sm_lm78_exit);
Linux 6.x block layer and io_uring tree(s)