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1/*
2 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 *
5 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl>
6 * Philip Edelbrock <phil@netroedge.com>
7 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl>
8 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable
9 * guidance from Jean Delvare
10 *
11 * Driver supports Analog Devices ADM9240
12 * Dallas Semiconductor DS1780
13 * National Semiconductor LM81
14 *
15 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
16 *
17 * Voltage Six inputs are scaled by chip, VID also reported
18 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris
19 * Fans 2 fans, low speed alarm, automatic fan clock divider
20 * Alarms 16-bit map of active alarms
21 * Analog Out 0..1250 mV output
22 *
23 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
24 *
25 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
26 *
27 * LM81 extended temp reading not implemented
28 *
29 * This program is free software; you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License as published by
31 * the Free Software Foundation; either version 2 of the License, or
32 * (at your option) any later version.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * You should have received a copy of the GNU General Public License
40 * along with this program; if not, write to the Free Software
41 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
42 */
43
44#include <linux/init.h>
45#include <linux/module.h>
46#include <linux/slab.h>
47#include <linux/i2c.h>
48#include <linux/hwmon-sysfs.h>
49#include <linux/hwmon.h>
50#include <linux/hwmon-vid.h>
51#include <linux/err.h>
52#include <linux/mutex.h>
53
54/* Addresses to scan */
55static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
56 I2C_CLIENT_END };
57
58enum chips { adm9240, ds1780, lm81 };
59
60/* ADM9240 registers */
61#define ADM9240_REG_MAN_ID 0x3e
62#define ADM9240_REG_DIE_REV 0x3f
63#define ADM9240_REG_CONFIG 0x40
64
65#define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
66#define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
67#define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
68#define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
69#define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
70#define ADM9240_REG_INT(nr) (0x41 + (nr))
71#define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
72#define ADM9240_REG_TEMP 0x27
73#define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
74#define ADM9240_REG_ANALOG_OUT 0x19
75#define ADM9240_REG_CHASSIS_CLEAR 0x46
76#define ADM9240_REG_VID_FAN_DIV 0x47
77#define ADM9240_REG_I2C_ADDR 0x48
78#define ADM9240_REG_VID4 0x49
79#define ADM9240_REG_TEMP_CONF 0x4b
80
81/* generalised scaling with integer rounding */
82static inline int SCALE(long val, int mul, int div)
83{
84 if (val < 0)
85 return (val * mul - div / 2) / div;
86 else
87 return (val * mul + div / 2) / div;
88}
89
90/* adm9240 internally scales voltage measurements */
91static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
92
93static inline unsigned int IN_FROM_REG(u8 reg, int n)
94{
95 return SCALE(reg, nom_mv[n], 192);
96}
97
98static inline u8 IN_TO_REG(unsigned long val, int n)
99{
100 return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
101}
102
103/* temperature range: -40..125, 127 disables temperature alarm */
104static inline s8 TEMP_TO_REG(long val)
105{
106 return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127);
107}
108
109/* two fans, each with low fan speed limit */
110static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
111{
112 if (!reg) /* error */
113 return -1;
114
115 if (reg == 255)
116 return 0;
117
118 return SCALE(1350000, 1, reg * div);
119}
120
121/* analog out 0..1250mV */
122static inline u8 AOUT_TO_REG(unsigned long val)
123{
124 return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255);
125}
126
127static inline unsigned int AOUT_FROM_REG(u8 reg)
128{
129 return SCALE(reg, 1250, 255);
130}
131
132static int adm9240_probe(struct i2c_client *client,
133 const struct i2c_device_id *id);
134static int adm9240_detect(struct i2c_client *client,
135 struct i2c_board_info *info);
136static void adm9240_init_client(struct i2c_client *client);
137static int adm9240_remove(struct i2c_client *client);
138static struct adm9240_data *adm9240_update_device(struct device *dev);
139
140/* driver data */
141static const struct i2c_device_id adm9240_id[] = {
142 { "adm9240", adm9240 },
143 { "ds1780", ds1780 },
144 { "lm81", lm81 },
145 { }
146};
147MODULE_DEVICE_TABLE(i2c, adm9240_id);
148
149static struct i2c_driver adm9240_driver = {
150 .class = I2C_CLASS_HWMON,
151 .driver = {
152 .name = "adm9240",
153 },
154 .probe = adm9240_probe,
155 .remove = adm9240_remove,
156 .id_table = adm9240_id,
157 .detect = adm9240_detect,
158 .address_list = normal_i2c,
159};
160
161/* per client data */
162struct adm9240_data {
163 struct device *hwmon_dev;
164 struct mutex update_lock;
165 char valid;
166 unsigned long last_updated_measure;
167 unsigned long last_updated_config;
168
169 u8 in[6]; /* ro in0_input */
170 u8 in_max[6]; /* rw in0_max */
171 u8 in_min[6]; /* rw in0_min */
172 u8 fan[2]; /* ro fan1_input */
173 u8 fan_min[2]; /* rw fan1_min */
174 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
175 s16 temp; /* ro temp1_input, 9-bit sign-extended */
176 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
177 u16 alarms; /* ro alarms */
178 u8 aout; /* rw aout_output */
179 u8 vid; /* ro vid */
180 u8 vrm; /* -- vrm set on startup, no accessor */
181};
182
183/*** sysfs accessors ***/
184
185/* temperature */
186static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
187 char *buf)
188{
189 struct adm9240_data *data = adm9240_update_device(dev);
190 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
191}
192
193static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
194 char *buf)
195{
196 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
197 struct adm9240_data *data = adm9240_update_device(dev);
198 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
199}
200
201static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
202 const char *buf, size_t count)
203{
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
205 struct i2c_client *client = to_i2c_client(dev);
206 struct adm9240_data *data = i2c_get_clientdata(client);
207 long val = simple_strtol(buf, NULL, 10);
208
209 mutex_lock(&data->update_lock);
210 data->temp_max[attr->index] = TEMP_TO_REG(val);
211 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
212 data->temp_max[attr->index]);
213 mutex_unlock(&data->update_lock);
214 return count;
215}
216
217static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
218static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
219 show_max, set_max, 0);
220static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
221 show_max, set_max, 1);
222
223/* voltage */
224static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
225 char *buf)
226{
227 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
228 struct adm9240_data *data = adm9240_update_device(dev);
229 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
230 attr->index));
231}
232
233static ssize_t show_in_min(struct device *dev,
234 struct device_attribute *devattr, char *buf)
235{
236 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
237 struct adm9240_data *data = adm9240_update_device(dev);
238 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
239 attr->index));
240}
241
242static ssize_t show_in_max(struct device *dev,
243 struct device_attribute *devattr, char *buf)
244{
245 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
246 struct adm9240_data *data = adm9240_update_device(dev);
247 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
248 attr->index));
249}
250
251static ssize_t set_in_min(struct device *dev,
252 struct device_attribute *devattr,
253 const char *buf, size_t count)
254{
255 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
256 struct i2c_client *client = to_i2c_client(dev);
257 struct adm9240_data *data = i2c_get_clientdata(client);
258 unsigned long val = simple_strtoul(buf, NULL, 10);
259
260 mutex_lock(&data->update_lock);
261 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
262 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
263 data->in_min[attr->index]);
264 mutex_unlock(&data->update_lock);
265 return count;
266}
267
268static ssize_t set_in_max(struct device *dev,
269 struct device_attribute *devattr,
270 const char *buf, size_t count)
271{
272 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
273 struct i2c_client *client = to_i2c_client(dev);
274 struct adm9240_data *data = i2c_get_clientdata(client);
275 unsigned long val = simple_strtoul(buf, NULL, 10);
276
277 mutex_lock(&data->update_lock);
278 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
279 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
280 data->in_max[attr->index]);
281 mutex_unlock(&data->update_lock);
282 return count;
283}
284
285#define vin(nr) \
286static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
287 show_in, NULL, nr); \
288static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
289 show_in_min, set_in_min, nr); \
290static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
291 show_in_max, set_in_max, nr);
292
293vin(0);
294vin(1);
295vin(2);
296vin(3);
297vin(4);
298vin(5);
299
300/* fans */
301static ssize_t show_fan(struct device *dev,
302 struct device_attribute *devattr, char *buf)
303{
304 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
305 struct adm9240_data *data = adm9240_update_device(dev);
306 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
307 1 << data->fan_div[attr->index]));
308}
309
310static ssize_t show_fan_min(struct device *dev,
311 struct device_attribute *devattr, char *buf)
312{
313 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
314 struct adm9240_data *data = adm9240_update_device(dev);
315 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
316 1 << data->fan_div[attr->index]));
317}
318
319static ssize_t show_fan_div(struct device *dev,
320 struct device_attribute *devattr, char *buf)
321{
322 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
323 struct adm9240_data *data = adm9240_update_device(dev);
324 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
325}
326
327/* write new fan div, callers must hold data->update_lock */
328static void adm9240_write_fan_div(struct i2c_client *client, int nr,
329 u8 fan_div)
330{
331 u8 reg, old, shift = (nr + 2) * 2;
332
333 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
334 old = (reg >> shift) & 3;
335 reg &= ~(3 << shift);
336 reg |= (fan_div << shift);
337 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
338 dev_dbg(&client->dev, "fan%d clock divider changed from %u "
339 "to %u\n", nr + 1, 1 << old, 1 << fan_div);
340}
341
342/*
343 * set fan speed low limit:
344 *
345 * - value is zero: disable fan speed low limit alarm
346 *
347 * - value is below fan speed measurement range: enable fan speed low
348 * limit alarm to be asserted while fan speed too slow to measure
349 *
350 * - otherwise: select fan clock divider to suit fan speed low limit,
351 * measurement code may adjust registers to ensure fan speed reading
352 */
353static ssize_t set_fan_min(struct device *dev,
354 struct device_attribute *devattr,
355 const char *buf, size_t count)
356{
357 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
358 struct i2c_client *client = to_i2c_client(dev);
359 struct adm9240_data *data = i2c_get_clientdata(client);
360 unsigned long val = simple_strtoul(buf, NULL, 10);
361 int nr = attr->index;
362 u8 new_div;
363
364 mutex_lock(&data->update_lock);
365
366 if (!val) {
367 data->fan_min[nr] = 255;
368 new_div = data->fan_div[nr];
369
370 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
371 nr + 1);
372
373 } else if (val < 1350000 / (8 * 254)) {
374 new_div = 3;
375 data->fan_min[nr] = 254;
376
377 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
378 nr + 1, FAN_FROM_REG(254, 1 << new_div));
379
380 } else {
381 unsigned int new_min = 1350000 / val;
382
383 new_div = 0;
384 while (new_min > 192 && new_div < 3) {
385 new_div++;
386 new_min /= 2;
387 }
388 if (!new_min) /* keep > 0 */
389 new_min++;
390
391 data->fan_min[nr] = new_min;
392
393 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
394 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
395 }
396
397 if (new_div != data->fan_div[nr]) {
398 data->fan_div[nr] = new_div;
399 adm9240_write_fan_div(client, nr, new_div);
400 }
401 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
402 data->fan_min[nr]);
403
404 mutex_unlock(&data->update_lock);
405 return count;
406}
407
408#define fan(nr) \
409static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
410 show_fan, NULL, nr - 1); \
411static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
412 show_fan_div, NULL, nr - 1); \
413static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
414 show_fan_min, set_fan_min, nr - 1);
415
416fan(1);
417fan(2);
418
419/* alarms */
420static ssize_t show_alarms(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
423 struct adm9240_data *data = adm9240_update_device(dev);
424 return sprintf(buf, "%u\n", data->alarms);
425}
426static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
427
428static ssize_t show_alarm(struct device *dev,
429 struct device_attribute *attr, char *buf)
430{
431 int bitnr = to_sensor_dev_attr(attr)->index;
432 struct adm9240_data *data = adm9240_update_device(dev);
433 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
434}
435static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
436static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
437static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
438static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
439static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
440static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
441static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
442static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
443static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
444
445/* vid */
446static ssize_t show_vid(struct device *dev,
447 struct device_attribute *attr, char *buf)
448{
449 struct adm9240_data *data = adm9240_update_device(dev);
450 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
451}
452static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
453
454/* analog output */
455static ssize_t show_aout(struct device *dev,
456 struct device_attribute *attr, char *buf)
457{
458 struct adm9240_data *data = adm9240_update_device(dev);
459 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
460}
461
462static ssize_t set_aout(struct device *dev,
463 struct device_attribute *attr,
464 const char *buf, size_t count)
465{
466 struct i2c_client *client = to_i2c_client(dev);
467 struct adm9240_data *data = i2c_get_clientdata(client);
468 unsigned long val = simple_strtol(buf, NULL, 10);
469
470 mutex_lock(&data->update_lock);
471 data->aout = AOUT_TO_REG(val);
472 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
473 mutex_unlock(&data->update_lock);
474 return count;
475}
476static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
477
478/* chassis_clear */
479static ssize_t chassis_clear_legacy(struct device *dev,
480 struct device_attribute *attr,
481 const char *buf, size_t count)
482{
483 struct i2c_client *client = to_i2c_client(dev);
484 unsigned long val = simple_strtol(buf, NULL, 10);
485
486 dev_warn(dev, "Attribute chassis_clear is deprecated, "
487 "use intrusion0_alarm instead\n");
488
489 if (val == 1) {
490 i2c_smbus_write_byte_data(client,
491 ADM9240_REG_CHASSIS_CLEAR, 0x80);
492 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
493 }
494 return count;
495}
496static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear_legacy);
497
498static ssize_t chassis_clear(struct device *dev,
499 struct device_attribute *attr,
500 const char *buf, size_t count)
501{
502 struct i2c_client *client = to_i2c_client(dev);
503 struct adm9240_data *data = i2c_get_clientdata(client);
504 unsigned long val;
505
506 if (strict_strtoul(buf, 10, &val) || val != 0)
507 return -EINVAL;
508
509 mutex_lock(&data->update_lock);
510 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
511 data->valid = 0; /* Force cache refresh */
512 mutex_unlock(&data->update_lock);
513 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
514
515 return count;
516}
517static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
518 chassis_clear, 12);
519
520static struct attribute *adm9240_attributes[] = {
521 &sensor_dev_attr_in0_input.dev_attr.attr,
522 &sensor_dev_attr_in0_min.dev_attr.attr,
523 &sensor_dev_attr_in0_max.dev_attr.attr,
524 &sensor_dev_attr_in0_alarm.dev_attr.attr,
525 &sensor_dev_attr_in1_input.dev_attr.attr,
526 &sensor_dev_attr_in1_min.dev_attr.attr,
527 &sensor_dev_attr_in1_max.dev_attr.attr,
528 &sensor_dev_attr_in1_alarm.dev_attr.attr,
529 &sensor_dev_attr_in2_input.dev_attr.attr,
530 &sensor_dev_attr_in2_min.dev_attr.attr,
531 &sensor_dev_attr_in2_max.dev_attr.attr,
532 &sensor_dev_attr_in2_alarm.dev_attr.attr,
533 &sensor_dev_attr_in3_input.dev_attr.attr,
534 &sensor_dev_attr_in3_min.dev_attr.attr,
535 &sensor_dev_attr_in3_max.dev_attr.attr,
536 &sensor_dev_attr_in3_alarm.dev_attr.attr,
537 &sensor_dev_attr_in4_input.dev_attr.attr,
538 &sensor_dev_attr_in4_min.dev_attr.attr,
539 &sensor_dev_attr_in4_max.dev_attr.attr,
540 &sensor_dev_attr_in4_alarm.dev_attr.attr,
541 &sensor_dev_attr_in5_input.dev_attr.attr,
542 &sensor_dev_attr_in5_min.dev_attr.attr,
543 &sensor_dev_attr_in5_max.dev_attr.attr,
544 &sensor_dev_attr_in5_alarm.dev_attr.attr,
545 &dev_attr_temp1_input.attr,
546 &sensor_dev_attr_temp1_max.dev_attr.attr,
547 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
548 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
549 &sensor_dev_attr_fan1_input.dev_attr.attr,
550 &sensor_dev_attr_fan1_div.dev_attr.attr,
551 &sensor_dev_attr_fan1_min.dev_attr.attr,
552 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
553 &sensor_dev_attr_fan2_input.dev_attr.attr,
554 &sensor_dev_attr_fan2_div.dev_attr.attr,
555 &sensor_dev_attr_fan2_min.dev_attr.attr,
556 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
557 &dev_attr_alarms.attr,
558 &dev_attr_aout_output.attr,
559 &dev_attr_chassis_clear.attr,
560 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
561 &dev_attr_cpu0_vid.attr,
562 NULL
563};
564
565static const struct attribute_group adm9240_group = {
566 .attrs = adm9240_attributes,
567};
568
569
570/*** sensor chip detect and driver install ***/
571
572/* Return 0 if detection is successful, -ENODEV otherwise */
573static int adm9240_detect(struct i2c_client *new_client,
574 struct i2c_board_info *info)
575{
576 struct i2c_adapter *adapter = new_client->adapter;
577 const char *name = "";
578 int address = new_client->addr;
579 u8 man_id, die_rev;
580
581 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
582 return -ENODEV;
583
584 /* verify chip: reg address should match i2c address */
585 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
586 != address) {
587 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
588 address);
589 return -ENODEV;
590 }
591
592 /* check known chip manufacturer */
593 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
594 if (man_id == 0x23) {
595 name = "adm9240";
596 } else if (man_id == 0xda) {
597 name = "ds1780";
598 } else if (man_id == 0x01) {
599 name = "lm81";
600 } else {
601 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
602 man_id);
603 return -ENODEV;
604 }
605
606 /* successful detect, print chip info */
607 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
608 dev_info(&adapter->dev, "found %s revision %u\n",
609 man_id == 0x23 ? "ADM9240" :
610 man_id == 0xda ? "DS1780" : "LM81", die_rev);
611
612 strlcpy(info->type, name, I2C_NAME_SIZE);
613
614 return 0;
615}
616
617static int adm9240_probe(struct i2c_client *new_client,
618 const struct i2c_device_id *id)
619{
620 struct adm9240_data *data;
621 int err;
622
623 data = kzalloc(sizeof(*data), GFP_KERNEL);
624 if (!data) {
625 err = -ENOMEM;
626 goto exit;
627 }
628
629 i2c_set_clientdata(new_client, data);
630 mutex_init(&data->update_lock);
631
632 adm9240_init_client(new_client);
633
634 /* populate sysfs filesystem */
635 if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group)))
636 goto exit_free;
637
638 data->hwmon_dev = hwmon_device_register(&new_client->dev);
639 if (IS_ERR(data->hwmon_dev)) {
640 err = PTR_ERR(data->hwmon_dev);
641 goto exit_remove;
642 }
643
644 return 0;
645
646exit_remove:
647 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
648exit_free:
649 kfree(data);
650exit:
651 return err;
652}
653
654static int adm9240_remove(struct i2c_client *client)
655{
656 struct adm9240_data *data = i2c_get_clientdata(client);
657
658 hwmon_device_unregister(data->hwmon_dev);
659 sysfs_remove_group(&client->dev.kobj, &adm9240_group);
660
661 kfree(data);
662 return 0;
663}
664
665static 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 {
686 i2c_smbus_write_byte_data(client,
687 ADM9240_REG_IN_MIN(i), 0);
688 i2c_smbus_write_byte_data(client,
689 ADM9240_REG_IN_MAX(i), 255);
690 }
691 i2c_smbus_write_byte_data(client,
692 ADM9240_REG_FAN_MIN(0), 255);
693 i2c_smbus_write_byte_data(client,
694 ADM9240_REG_FAN_MIN(1), 255);
695 i2c_smbus_write_byte_data(client,
696 ADM9240_REG_TEMP_MAX(0), 127);
697 i2c_smbus_write_byte_data(client,
698 ADM9240_REG_TEMP_MAX(1), 127);
699
700 /* start measurement cycle */
701 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
702
703 dev_info(&client->dev, "cold start: config was 0x%02x "
704 "mode %u\n", conf, mode);
705 }
706}
707
708static struct adm9240_data *adm9240_update_device(struct device *dev)
709{
710 struct i2c_client *client = to_i2c_client(dev);
711 struct adm9240_data *data = i2c_get_clientdata(client);
712 int i;
713
714 mutex_lock(&data->update_lock);
715
716 /* minimum measurement cycle: 1.75 seconds */
717 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
718 || !data->valid) {
719
720 for (i = 0; i < 6; i++) /* read voltages */
721 {
722 data->in[i] = i2c_smbus_read_byte_data(client,
723 ADM9240_REG_IN(i));
724 }
725 data->alarms = i2c_smbus_read_byte_data(client,
726 ADM9240_REG_INT(0)) |
727 i2c_smbus_read_byte_data(client,
728 ADM9240_REG_INT(1)) << 8;
729
730 /* read temperature: assume temperature changes less than
731 * 0.5'C per two measurement cycles thus ignore possible
732 * but unlikely aliasing error on lsb reading. --Grant */
733 data->temp = ((i2c_smbus_read_byte_data(client,
734 ADM9240_REG_TEMP) << 8) |
735 i2c_smbus_read_byte_data(client,
736 ADM9240_REG_TEMP_CONF)) / 128;
737
738 for (i = 0; i < 2; i++) /* read fans */
739 {
740 data->fan[i] = i2c_smbus_read_byte_data(client,
741 ADM9240_REG_FAN(i));
742
743 /* adjust fan clock divider on overflow */
744 if (data->valid && data->fan[i] == 255 &&
745 data->fan_div[i] < 3) {
746
747 adm9240_write_fan_div(client, i,
748 ++data->fan_div[i]);
749
750 /* adjust fan_min if active, but not to 0 */
751 if (data->fan_min[i] < 255 &&
752 data->fan_min[i] >= 2)
753 data->fan_min[i] /= 2;
754 }
755 }
756 data->last_updated_measure = jiffies;
757 }
758
759 /* minimum config reading cycle: 300 seconds */
760 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
761 || !data->valid) {
762
763 for (i = 0; i < 6; i++)
764 {
765 data->in_min[i] = i2c_smbus_read_byte_data(client,
766 ADM9240_REG_IN_MIN(i));
767 data->in_max[i] = i2c_smbus_read_byte_data(client,
768 ADM9240_REG_IN_MAX(i));
769 }
770 for (i = 0; i < 2; i++)
771 {
772 data->fan_min[i] = i2c_smbus_read_byte_data(client,
773 ADM9240_REG_FAN_MIN(i));
774 }
775 data->temp_max[0] = i2c_smbus_read_byte_data(client,
776 ADM9240_REG_TEMP_MAX(0));
777 data->temp_max[1] = i2c_smbus_read_byte_data(client,
778 ADM9240_REG_TEMP_MAX(1));
779
780 /* read fan divs and 5-bit VID */
781 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
782 data->fan_div[0] = (i >> 4) & 3;
783 data->fan_div[1] = (i >> 6) & 3;
784 data->vid = i & 0x0f;
785 data->vid |= (i2c_smbus_read_byte_data(client,
786 ADM9240_REG_VID4) & 1) << 4;
787 /* read analog out */
788 data->aout = i2c_smbus_read_byte_data(client,
789 ADM9240_REG_ANALOG_OUT);
790
791 data->last_updated_config = jiffies;
792 data->valid = 1;
793 }
794 mutex_unlock(&data->update_lock);
795 return data;
796}
797
798static int __init sensors_adm9240_init(void)
799{
800 return i2c_add_driver(&adm9240_driver);
801}
802
803static void __exit sensors_adm9240_exit(void)
804{
805 i2c_del_driver(&adm9240_driver);
806}
807
808MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
809 "Grant Coady <gcoady.lk@gmail.com> and others");
810MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
811MODULE_LICENSE("GPL");
812
813module_init(sensors_adm9240_init);
814module_exit(sensors_adm9240_exit);
815
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 */
43static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
44 I2C_CLIENT_END };
45
46enum 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 */
70static 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 */
79static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
80
81static inline unsigned int IN_FROM_REG(u8 reg, int n)
82{
83 return SCALE(reg, nom_mv[n], 192);
84}
85
86static 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 */
93static 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 */
100static 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 */
112static inline u8 AOUT_TO_REG(unsigned long val)
113{
114 val = clamp_val(val, 0, 1250);
115 return SCALE(val, 255, 1250);
116}
117
118static inline unsigned int AOUT_FROM_REG(u8 reg)
119{
120 return SCALE(reg, 1250, 255);
121}
122
123/* per client data */
124struct 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 */
146static 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
161static 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 */
252static 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
259static 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
267static 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
288static DEVICE_ATTR_RO(temp1_input);
289static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
290static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max, 1);
291
292/* voltage */
293static 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
302static 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
311static 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
320static 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
342static 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
364static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
365static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
366static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
367static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
368static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
369static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
370static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
371static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
372static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
373static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
374static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
375static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
376static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
377static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
378static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
379static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
380static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
381static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
382
383/* fans */
384static 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
393static 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
402static 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 */
421static 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
481static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
482static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
483static SENSOR_DEVICE_ATTR_RO(fan1_div, fan_div, 0);
484static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
485static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
486static SENSOR_DEVICE_ATTR_RO(fan2_div, fan_div, 1);
487
488/* alarms */
489static 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}
495static DEVICE_ATTR_RO(alarms);
496
497static 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}
504static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
505static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
506static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
507static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
508static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
509static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
510static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
511static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
512static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
513
514/* vid */
515static 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}
521static DEVICE_ATTR_RO(cpu0_vid);
522
523/* analog output */
524static 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
531static 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}
550static DEVICE_ATTR_RW(aout_output);
551
552static 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}
570static SENSOR_DEVICE_ATTR_RW(intrusion0_alarm, alarm, 12);
571
572static 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
616ATTRIBUTE_GROUPS(adm9240);
617
618/*** sensor chip detect and driver install ***/
619
620/* Return 0 if detection is successful, -ENODEV otherwise */
621static 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
665static 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
707static 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
731static const struct i2c_device_id adm9240_id[] = {
732 { "adm9240", adm9240 },
733 { "ds1780", ds1780 },
734 { "lm81", lm81 },
735 { }
736};
737MODULE_DEVICE_TABLE(i2c, adm9240_id);
738
739static 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
750module_i2c_driver(adm9240_driver);
751
752MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
753 "Grant Coady <gcoady.lk@gmail.com> and others");
754MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
755MODULE_LICENSE("GPL");