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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hwmon / adm9240.c
blob496d47490e1070bbca3e20f6e373d21d9d0d0aa6
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 *
6 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl>
7 * Philip Edelbrock <phil@netroedge.com>
8 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl>
9 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable
10 * guidance from Jean Delvare
11 *
12 * Driver supports Analog Devices ADM9240
13 * Dallas Semiconductor DS1780
14 * National Semiconductor LM81
15 *
16 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
17 *
18 * Voltage Six inputs are scaled by chip, VID also reported
19 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris
20 * Fans 2 fans, low speed alarm, automatic fan clock divider
21 * Alarms 16-bit map of active alarms
22 * Analog Out 0..1250 mV output
23 *
24 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
25 *
26 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
27 *
28 * LM81 extended temp reading not implemented
29 */
30
31 #include <linux/init.h>
32 #include <linux/module.h>
33 #include <linux/slab.h>
34 #include <linux/i2c.h>
35 #include <linux/hwmon-sysfs.h>
36 #include <linux/hwmon.h>
37 #include <linux/hwmon-vid.h>
38 #include <linux/err.h>
39 #include <linux/mutex.h>
40 #include <linux/jiffies.h>
41
42 /* Addresses to scan */
43 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
44 I2C_CLIENT_END };
45
46 enum chips { adm9240, ds1780, lm81 };
47
48 /* ADM9240 registers */
49 #define ADM9240_REG_MAN_ID 0x3e
50 #define ADM9240_REG_DIE_REV 0x3f
51 #define ADM9240_REG_CONFIG 0x40
52
53 #define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
54 #define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
55 #define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
56 #define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
57 #define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
58 #define ADM9240_REG_INT(nr) (0x41 + (nr))
59 #define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
60 #define ADM9240_REG_TEMP 0x27
61 #define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
62 #define ADM9240_REG_ANALOG_OUT 0x19
63 #define ADM9240_REG_CHASSIS_CLEAR 0x46
64 #define ADM9240_REG_VID_FAN_DIV 0x47
65 #define ADM9240_REG_I2C_ADDR 0x48
66 #define ADM9240_REG_VID4 0x49
67 #define ADM9240_REG_TEMP_CONF 0x4b
68
69 /* generalised scaling with integer rounding */
70 static inline int SCALE(long val, int mul, int div)
71 {
72 if (val < 0)
73 return (val * mul - div / 2) / div;
74 else
75 return (val * mul + div / 2) / div;
76 }
77
78 /* adm9240 internally scales voltage measurements */
79 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
80
81 static inline unsigned int IN_FROM_REG(u8 reg, int n)
82 {
83 return SCALE(reg, nom_mv[n], 192);
84 }
85
86 static inline u8 IN_TO_REG(unsigned long val, int n)
87 {
88 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
89 return SCALE(val, 192, nom_mv[n]);
90 }
91
92 /* temperature range: -40..125, 127 disables temperature alarm */
93 static inline s8 TEMP_TO_REG(long val)
94 {
95 val = clamp_val(val, -40000, 127000);
96 return SCALE(val, 1, 1000);
97 }
98
99 /* two fans, each with low fan speed limit */
100 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
101 {
102 if (!reg) /* error */
103 return -1;
104
105 if (reg == 255)
106 return 0;
107
108 return SCALE(1350000, 1, reg * div);
109 }
110
111 /* analog out 0..1250mV */
112 static inline u8 AOUT_TO_REG(unsigned long val)
113 {
114 val = clamp_val(val, 0, 1250);
115 return SCALE(val, 255, 1250);
116 }
117
118 static inline unsigned int AOUT_FROM_REG(u8 reg)
119 {
120 return SCALE(reg, 1250, 255);
121 }
122
123 /* per client data */
124 struct adm9240_data {
125 struct i2c_client *client;
126 struct mutex update_lock;
127 char valid;
128 unsigned long last_updated_measure;
129 unsigned long last_updated_config;
130
131 u8 in[6]; /* ro in0_input */
132 u8 in_max[6]; /* rw in0_max */
133 u8 in_min[6]; /* rw in0_min */
134 u8 fan[2]; /* ro fan1_input */
135 u8 fan_min[2]; /* rw fan1_min */
136 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
137 s16 temp; /* ro temp1_input, 9-bit sign-extended */
138 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
139 u16 alarms; /* ro alarms */
140 u8 aout; /* rw aout_output */
141 u8 vid; /* ro vid */
142 u8 vrm; /* -- vrm set on startup, no accessor */
143 };
144
145 /* write new fan div, callers must hold data->update_lock */
146 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
147 u8 fan_div)
148 {
149 u8 reg, old, shift = (nr + 2) * 2;
150
151 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
152 old = (reg >> shift) & 3;
153 reg &= ~(3 << shift);
154 reg |= (fan_div << shift);
155 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
156 dev_dbg(&client->dev,
157 "fan%d clock divider changed from %u to %u\n",
158 nr + 1, 1 << old, 1 << fan_div);
159 }
160
161 static struct adm9240_data *adm9240_update_device(struct device *dev)
162 {
163 struct adm9240_data *data = dev_get_drvdata(dev);
164 struct i2c_client *client = data->client;
165 int i;
166
167 mutex_lock(&data->update_lock);
168
169 /* minimum measurement cycle: 1.75 seconds */
170 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
171 || !data->valid) {
172
173 for (i = 0; i < 6; i++) { /* read voltages */
174 data->in[i] = i2c_smbus_read_byte_data(client,
175 ADM9240_REG_IN(i));
176 }
177 data->alarms = i2c_smbus_read_byte_data(client,
178 ADM9240_REG_INT(0)) |
179 i2c_smbus_read_byte_data(client,
180 ADM9240_REG_INT(1)) << 8;
181
182 /*
183 * read temperature: assume temperature changes less than
184 * 0.5'C per two measurement cycles thus ignore possible
185 * but unlikely aliasing error on lsb reading. --Grant
186 */
187 data->temp = (i2c_smbus_read_byte_data(client,
188 ADM9240_REG_TEMP) << 8) |
189 i2c_smbus_read_byte_data(client,
190 ADM9240_REG_TEMP_CONF);
191
192 for (i = 0; i < 2; i++) { /* read fans */
193 data->fan[i] = i2c_smbus_read_byte_data(client,
194 ADM9240_REG_FAN(i));
195
196 /* adjust fan clock divider on overflow */
197 if (data->valid && data->fan[i] == 255 &&
198 data->fan_div[i] < 3) {
199
200 adm9240_write_fan_div(client, i,
201 ++data->fan_div[i]);
202
203 /* adjust fan_min if active, but not to 0 */
204 if (data->fan_min[i] < 255 &&
205 data->fan_min[i] >= 2)
206 data->fan_min[i] /= 2;
207 }
208 }
209 data->last_updated_measure = jiffies;
210 }
211
212 /* minimum config reading cycle: 300 seconds */
213 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
214 || !data->valid) {
215
216 for (i = 0; i < 6; i++) {
217 data->in_min[i] = i2c_smbus_read_byte_data(client,
218 ADM9240_REG_IN_MIN(i));
219 data->in_max[i] = i2c_smbus_read_byte_data(client,
220 ADM9240_REG_IN_MAX(i));
221 }
222 for (i = 0; i < 2; i++) {
223 data->fan_min[i] = i2c_smbus_read_byte_data(client,
224 ADM9240_REG_FAN_MIN(i));
225 }
226 data->temp_max[0] = i2c_smbus_read_byte_data(client,
227 ADM9240_REG_TEMP_MAX(0));
228 data->temp_max[1] = i2c_smbus_read_byte_data(client,
229 ADM9240_REG_TEMP_MAX(1));
230
231 /* read fan divs and 5-bit VID */
232 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
233 data->fan_div[0] = (i >> 4) & 3;
234 data->fan_div[1] = (i >> 6) & 3;
235 data->vid = i & 0x0f;
236 data->vid |= (i2c_smbus_read_byte_data(client,
237 ADM9240_REG_VID4) & 1) << 4;
238 /* read analog out */
239 data->aout = i2c_smbus_read_byte_data(client,
240 ADM9240_REG_ANALOG_OUT);
241
242 data->last_updated_config = jiffies;
243 data->valid = 1;
244 }
245 mutex_unlock(&data->update_lock);
246 return data;
247 }
248
249 /*** sysfs accessors ***/
250
251 /* temperature */
252 static ssize_t temp1_input_show(struct device *dev,
253 struct device_attribute *dummy, char *buf)
254 {
255 struct adm9240_data *data = adm9240_update_device(dev);
256 return sprintf(buf, "%d\n", data->temp / 128 * 500); /* 9-bit value */
257 }
258
259 static ssize_t max_show(struct device *dev, struct device_attribute *devattr,
260 char *buf)
261 {
262 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
263 struct adm9240_data *data = adm9240_update_device(dev);
264 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
265 }
266
267 static ssize_t max_store(struct device *dev, struct device_attribute *devattr,
268 const char *buf, size_t count)
269 {
270 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
271 struct adm9240_data *data = dev_get_drvdata(dev);
272 struct i2c_client *client = data->client;
273 long val;
274 int err;
275
276 err = kstrtol(buf, 10, &val);
277 if (err)
278 return err;
279
280 mutex_lock(&data->update_lock);
281 data->temp_max[attr->index] = TEMP_TO_REG(val);
282 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
283 data->temp_max[attr->index]);
284 mutex_unlock(&data->update_lock);
285 return count;
286 }
287
288 static DEVICE_ATTR_RO(temp1_input);
289 static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
290 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max, 1);
291
292 /* voltage */
293 static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
294 char *buf)
295 {
296 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
297 struct adm9240_data *data = adm9240_update_device(dev);
298 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
299 attr->index));
300 }
301
302 static ssize_t in_min_show(struct device *dev,
303 struct device_attribute *devattr, char *buf)
304 {
305 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
306 struct adm9240_data *data = adm9240_update_device(dev);
307 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
308 attr->index));
309 }
310
311 static ssize_t in_max_show(struct device *dev,
312 struct device_attribute *devattr, char *buf)
313 {
314 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
315 struct adm9240_data *data = adm9240_update_device(dev);
316 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
317 attr->index));
318 }
319
320 static ssize_t in_min_store(struct device *dev,
321 struct device_attribute *devattr, const char *buf,
322 size_t count)
323 {
324 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
325 struct adm9240_data *data = dev_get_drvdata(dev);
326 struct i2c_client *client = data->client;
327 unsigned long val;
328 int err;
329
330 err = kstrtoul(buf, 10, &val);
331 if (err)
332 return err;
333
334 mutex_lock(&data->update_lock);
335 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
336 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
337 data->in_min[attr->index]);
338 mutex_unlock(&data->update_lock);
339 return count;
340 }
341
342 static ssize_t in_max_store(struct device *dev,
343 struct device_attribute *devattr, const char *buf,
344 size_t count)
345 {
346 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
347 struct adm9240_data *data = dev_get_drvdata(dev);
348 struct i2c_client *client = data->client;
349 unsigned long val;
350 int err;
351
352 err = kstrtoul(buf, 10, &val);
353 if (err)
354 return err;
355
356 mutex_lock(&data->update_lock);
357 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
358 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
359 data->in_max[attr->index]);
360 mutex_unlock(&data->update_lock);
361 return count;
362 }
363
364 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
365 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
366 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
367 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
368 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
369 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
370 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
371 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
372 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
373 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
374 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
375 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
376 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
377 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
378 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
379 static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
380 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
381 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
382
383 /* fans */
384 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
385 char *buf)
386 {
387 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
388 struct adm9240_data *data = adm9240_update_device(dev);
389 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
390 1 << data->fan_div[attr->index]));
391 }
392
393 static ssize_t fan_min_show(struct device *dev,
394 struct device_attribute *devattr, char *buf)
395 {
396 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
397 struct adm9240_data *data = adm9240_update_device(dev);
398 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
399 1 << data->fan_div[attr->index]));
400 }
401
402 static ssize_t fan_div_show(struct device *dev,
403 struct device_attribute *devattr, char *buf)
404 {
405 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
406 struct adm9240_data *data = adm9240_update_device(dev);
407 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
408 }
409
410 /*
411 * set fan speed low limit:
412 *
413 * - value is zero: disable fan speed low limit alarm
414 *
415 * - value is below fan speed measurement range: enable fan speed low
416 * limit alarm to be asserted while fan speed too slow to measure
417 *
418 * - otherwise: select fan clock divider to suit fan speed low limit,
419 * measurement code may adjust registers to ensure fan speed reading
420 */
421 static ssize_t fan_min_store(struct device *dev,
422 struct device_attribute *devattr,
423 const char *buf, size_t count)
424 {
425 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
426 struct adm9240_data *data = dev_get_drvdata(dev);
427 struct i2c_client *client = data->client;
428 int nr = attr->index;
429 u8 new_div;
430 unsigned long val;
431 int err;
432
433 err = kstrtoul(buf, 10, &val);
434 if (err)
435 return err;
436
437 mutex_lock(&data->update_lock);
438
439 if (!val) {
440 data->fan_min[nr] = 255;
441 new_div = data->fan_div[nr];
442
443 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
444 nr + 1);
445
446 } else if (val < 1350000 / (8 * 254)) {
447 new_div = 3;
448 data->fan_min[nr] = 254;
449
450 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
451 nr + 1, FAN_FROM_REG(254, 1 << new_div));
452
453 } else {
454 unsigned int new_min = 1350000 / val;
455
456 new_div = 0;
457 while (new_min > 192 && new_div < 3) {
458 new_div++;
459 new_min /= 2;
460 }
461 if (!new_min) /* keep > 0 */
462 new_min++;
463
464 data->fan_min[nr] = new_min;
465
466 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
467 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
468 }
469
470 if (new_div != data->fan_div[nr]) {
471 data->fan_div[nr] = new_div;
472 adm9240_write_fan_div(client, nr, new_div);
473 }
474 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
475 data->fan_min[nr]);
476
477 mutex_unlock(&data->update_lock);
478 return count;
479 }
480
481 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
482 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
483 static SENSOR_DEVICE_ATTR_RO(fan1_div, fan_div, 0);
484 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
485 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
486 static SENSOR_DEVICE_ATTR_RO(fan2_div, fan_div, 1);
487
488 /* alarms */
489 static ssize_t alarms_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491 {
492 struct adm9240_data *data = adm9240_update_device(dev);
493 return sprintf(buf, "%u\n", data->alarms);
494 }
495 static DEVICE_ATTR_RO(alarms);
496
497 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
498 char *buf)
499 {
500 int bitnr = to_sensor_dev_attr(attr)->index;
501 struct adm9240_data *data = adm9240_update_device(dev);
502 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
503 }
504 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
505 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
506 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
507 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
508 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
509 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
510 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
511 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
512 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
513
514 /* vid */
515 static ssize_t cpu0_vid_show(struct device *dev,
516 struct device_attribute *attr, char *buf)
517 {
518 struct adm9240_data *data = adm9240_update_device(dev);
519 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
520 }
521 static DEVICE_ATTR_RO(cpu0_vid);
522
523 /* analog output */
524 static ssize_t aout_output_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
526 {
527 struct adm9240_data *data = adm9240_update_device(dev);
528 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
529 }
530
531 static ssize_t aout_output_store(struct device *dev,
532 struct device_attribute *attr,
533 const char *buf, size_t count)
534 {
535 struct adm9240_data *data = dev_get_drvdata(dev);
536 struct i2c_client *client = data->client;
537 long val;
538 int err;
539
540 err = kstrtol(buf, 10, &val);
541 if (err)
542 return err;
543
544 mutex_lock(&data->update_lock);
545 data->aout = AOUT_TO_REG(val);
546 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
547 mutex_unlock(&data->update_lock);
548 return count;
549 }
550 static DEVICE_ATTR_RW(aout_output);
551
552 static ssize_t alarm_store(struct device *dev, struct device_attribute *attr,
553 const char *buf, size_t count)
554 {
555 struct adm9240_data *data = dev_get_drvdata(dev);
556 struct i2c_client *client = data->client;
557 unsigned long val;
558
559 if (kstrtoul(buf, 10, &val) || val != 0)
560 return -EINVAL;
561
562 mutex_lock(&data->update_lock);
563 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
564 data->valid = 0; /* Force cache refresh */
565 mutex_unlock(&data->update_lock);
566 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
567
568 return count;
569 }
570 static SENSOR_DEVICE_ATTR_RW(intrusion0_alarm, alarm, 12);
571
572 static struct attribute *adm9240_attrs[] = {
573 &sensor_dev_attr_in0_input.dev_attr.attr,
574 &sensor_dev_attr_in0_min.dev_attr.attr,
575 &sensor_dev_attr_in0_max.dev_attr.attr,
576 &sensor_dev_attr_in0_alarm.dev_attr.attr,
577 &sensor_dev_attr_in1_input.dev_attr.attr,
578 &sensor_dev_attr_in1_min.dev_attr.attr,
579 &sensor_dev_attr_in1_max.dev_attr.attr,
580 &sensor_dev_attr_in1_alarm.dev_attr.attr,
581 &sensor_dev_attr_in2_input.dev_attr.attr,
582 &sensor_dev_attr_in2_min.dev_attr.attr,
583 &sensor_dev_attr_in2_max.dev_attr.attr,
584 &sensor_dev_attr_in2_alarm.dev_attr.attr,
585 &sensor_dev_attr_in3_input.dev_attr.attr,
586 &sensor_dev_attr_in3_min.dev_attr.attr,
587 &sensor_dev_attr_in3_max.dev_attr.attr,
588 &sensor_dev_attr_in3_alarm.dev_attr.attr,
589 &sensor_dev_attr_in4_input.dev_attr.attr,
590 &sensor_dev_attr_in4_min.dev_attr.attr,
591 &sensor_dev_attr_in4_max.dev_attr.attr,
592 &sensor_dev_attr_in4_alarm.dev_attr.attr,
593 &sensor_dev_attr_in5_input.dev_attr.attr,
594 &sensor_dev_attr_in5_min.dev_attr.attr,
595 &sensor_dev_attr_in5_max.dev_attr.attr,
596 &sensor_dev_attr_in5_alarm.dev_attr.attr,
597 &dev_attr_temp1_input.attr,
598 &sensor_dev_attr_temp1_max.dev_attr.attr,
599 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
600 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
601 &sensor_dev_attr_fan1_input.dev_attr.attr,
602 &sensor_dev_attr_fan1_div.dev_attr.attr,
603 &sensor_dev_attr_fan1_min.dev_attr.attr,
604 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
605 &sensor_dev_attr_fan2_input.dev_attr.attr,
606 &sensor_dev_attr_fan2_div.dev_attr.attr,
607 &sensor_dev_attr_fan2_min.dev_attr.attr,
608 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
609 &dev_attr_alarms.attr,
610 &dev_attr_aout_output.attr,
611 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
612 &dev_attr_cpu0_vid.attr,
613 NULL
614 };
615
616 ATTRIBUTE_GROUPS(adm9240);
617
618 /*** sensor chip detect and driver install ***/
619
620 /* Return 0 if detection is successful, -ENODEV otherwise */
621 static int adm9240_detect(struct i2c_client *new_client,
622 struct i2c_board_info *info)
623 {
624 struct i2c_adapter *adapter = new_client->adapter;
625 const char *name = "";
626 int address = new_client->addr;
627 u8 man_id, die_rev;
628
629 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
630 return -ENODEV;
631
632 /* verify chip: reg address should match i2c address */
633 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
634 != address) {
635 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
636 address);
637 return -ENODEV;
638 }
639
640 /* check known chip manufacturer */
641 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
642 if (man_id == 0x23) {
643 name = "adm9240";
644 } else if (man_id == 0xda) {
645 name = "ds1780";
646 } else if (man_id == 0x01) {
647 name = "lm81";
648 } else {
649 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
650 man_id);
651 return -ENODEV;
652 }
653
654 /* successful detect, print chip info */
655 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
656 dev_info(&adapter->dev, "found %s revision %u\n",
657 man_id == 0x23 ? "ADM9240" :
658 man_id == 0xda ? "DS1780" : "LM81", die_rev);
659
660 strlcpy(info->type, name, I2C_NAME_SIZE);
661
662 return 0;
663 }
664
665 static void adm9240_init_client(struct i2c_client *client)
666 {
667 struct adm9240_data *data = i2c_get_clientdata(client);
668 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
669 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
670
671 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
672
673 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
674 data->vrm % 10);
675
676 if (conf & 1) { /* measurement cycle running: report state */
677
678 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
679 conf, mode);
680
681 } else { /* cold start: open limits before starting chip */
682 int i;
683
684 for (i = 0; i < 6; i++) {
685 i2c_smbus_write_byte_data(client,
686 ADM9240_REG_IN_MIN(i), 0);
687 i2c_smbus_write_byte_data(client,
688 ADM9240_REG_IN_MAX(i), 255);
689 }
690 i2c_smbus_write_byte_data(client,
691 ADM9240_REG_FAN_MIN(0), 255);
692 i2c_smbus_write_byte_data(client,
693 ADM9240_REG_FAN_MIN(1), 255);
694 i2c_smbus_write_byte_data(client,
695 ADM9240_REG_TEMP_MAX(0), 127);
696 i2c_smbus_write_byte_data(client,
697 ADM9240_REG_TEMP_MAX(1), 127);
698
699 /* start measurement cycle */
700 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
701
702 dev_info(&client->dev,
703 "cold start: config was 0x%02x mode %u\n", conf, mode);
704 }
705 }
706
707 static int adm9240_probe(struct i2c_client *new_client,
708 const struct i2c_device_id *id)
709 {
710 struct device *dev = &new_client->dev;
711 struct device *hwmon_dev;
712 struct adm9240_data *data;
713
714 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
715 if (!data)
716 return -ENOMEM;
717
718 i2c_set_clientdata(new_client, data);
719 data->client = new_client;
720 mutex_init(&data->update_lock);
721
722 adm9240_init_client(new_client);
723
724 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
725 new_client->name,
726 data,
727 adm9240_groups);
728 return PTR_ERR_OR_ZERO(hwmon_dev);
729 }
730
731 static const struct i2c_device_id adm9240_id[] = {
732 { "adm9240", adm9240 },
733 { "ds1780", ds1780 },
734 { "lm81", lm81 },
735 { }
736 };
737 MODULE_DEVICE_TABLE(i2c, adm9240_id);
738
739 static struct i2c_driver adm9240_driver = {
740 .class = I2C_CLASS_HWMON,
741 .driver = {
742 .name = "adm9240",
743 },
744 .probe = adm9240_probe,
745 .id_table = adm9240_id,
746 .detect = adm9240_detect,
747 .address_list = normal_i2c,
748 };
749
750 module_i2c_driver(adm9240_driver);
751
752 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
753 "Grant Coady <gcoady.lk@gmail.com> and others");
754 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
755 MODULE_LICENSE("GPL");
Linux with added FPC-III support