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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/bits.h>
32#include <linux/init.h>
33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/i2c.h>
36#include <linux/hwmon-sysfs.h>
37#include <linux/hwmon.h>
38#include <linux/hwmon-vid.h>
39#include <linux/err.h>
40#include <linux/mutex.h>
41#include <linux/regmap.h>
42
43/* Addresses to scan */
44static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
45 I2C_CLIENT_END };
46
47enum chips { adm9240, ds1780, lm81 };
48
49/* ADM9240 registers */
50#define ADM9240_REG_MAN_ID 0x3e
51#define ADM9240_REG_DIE_REV 0x3f
52#define ADM9240_REG_CONFIG 0x40
53
54#define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
55#define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
56#define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
57#define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
58#define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
59#define ADM9240_REG_INT(nr) (0x41 + (nr))
60#define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
61#define ADM9240_REG_TEMP 0x27
62#define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
63#define ADM9240_REG_ANALOG_OUT 0x19
64#define ADM9240_REG_CHASSIS_CLEAR 0x46
65#define ADM9240_REG_VID_FAN_DIV 0x47
66#define ADM9240_REG_I2C_ADDR 0x48
67#define ADM9240_REG_VID4 0x49
68#define ADM9240_REG_TEMP_CONF 0x4b
69
70/* generalised scaling with integer rounding */
71static inline int SCALE(long val, int mul, int div)
72{
73 if (val < 0)
74 return (val * mul - div / 2) / div;
75 else
76 return (val * mul + div / 2) / div;
77}
78
79/* adm9240 internally scales voltage measurements */
80static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
81
82static inline unsigned int IN_FROM_REG(u8 reg, int n)
83{
84 return SCALE(reg, nom_mv[n], 192);
85}
86
87static inline u8 IN_TO_REG(unsigned long val, int n)
88{
89 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
90 return SCALE(val, 192, nom_mv[n]);
91}
92
93/* temperature range: -40..125, 127 disables temperature alarm */
94static inline s8 TEMP_TO_REG(long val)
95{
96 val = clamp_val(val, -40000, 127000);
97 return SCALE(val, 1, 1000);
98}
99
100/* two fans, each with low fan speed limit */
101static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
102{
103 if (!reg) /* error */
104 return -1;
105
106 if (reg == 255)
107 return 0;
108
109 return SCALE(1350000, 1, reg * div);
110}
111
112/* analog out 0..1250mV */
113static inline u8 AOUT_TO_REG(unsigned long val)
114{
115 val = clamp_val(val, 0, 1250);
116 return SCALE(val, 255, 1250);
117}
118
119static inline unsigned int AOUT_FROM_REG(u8 reg)
120{
121 return SCALE(reg, 1250, 255);
122}
123
124/* per client data */
125struct adm9240_data {
126 struct device *dev;
127 struct regmap *regmap;
128 struct mutex update_lock;
129
130 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
131 u8 vrm; /* -- vrm set on startup, no accessor */
132};
133
134/* write new fan div, callers must hold data->update_lock */
135static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
136{
137 unsigned int reg, old, shift = (channel + 2) * 2;
138 int err;
139
140 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®);
141 if (err < 0)
142 return err;
143 old = (reg >> shift) & 3;
144 reg &= ~(3 << shift);
145 reg |= (fan_div << shift);
146 err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
147 if (err < 0)
148 return err;
149 dev_dbg(data->dev,
150 "fan%d clock divider changed from %lu to %lu\n",
151 channel + 1, BIT(old), BIT(fan_div));
152
153 return 0;
154}
155
156/*
157 * set fan speed low limit:
158 *
159 * - value is zero: disable fan speed low limit alarm
160 *
161 * - value is below fan speed measurement range: enable fan speed low
162 * limit alarm to be asserted while fan speed too slow to measure
163 *
164 * - otherwise: select fan clock divider to suit fan speed low limit,
165 * measurement code may adjust registers to ensure fan speed reading
166 */
167static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
168{
169 u8 new_div;
170 u8 fan_min;
171 int err;
172
173 mutex_lock(&data->update_lock);
174
175 if (!val) {
176 fan_min = 255;
177 new_div = data->fan_div[channel];
178
179 dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
180 } else if (val < 1350000 / (8 * 254)) {
181 new_div = 3;
182 fan_min = 254;
183
184 dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
185 channel + 1, FAN_FROM_REG(254, BIT(new_div)));
186 } else {
187 unsigned int new_min = 1350000 / val;
188
189 new_div = 0;
190 while (new_min > 192 && new_div < 3) {
191 new_div++;
192 new_min /= 2;
193 }
194 if (!new_min) /* keep > 0 */
195 new_min++;
196
197 fan_min = new_min;
198
199 dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
200 channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
201 }
202
203 if (new_div != data->fan_div[channel]) {
204 data->fan_div[channel] = new_div;
205 adm9240_write_fan_div(data, channel, new_div);
206 }
207 err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
208
209 mutex_unlock(&data->update_lock);
210
211 return err;
212}
213
214static ssize_t cpu0_vid_show(struct device *dev,
215 struct device_attribute *attr, char *buf)
216{
217 struct adm9240_data *data = dev_get_drvdata(dev);
218 unsigned int regval;
219 int err;
220 u8 vid;
221
222 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®val);
223 if (err < 0)
224 return err;
225 vid = regval & 0x0f;
226 err = regmap_read(data->regmap, ADM9240_REG_VID4, ®val);
227 if (err < 0)
228 return err;
229 vid |= (regval & 1) << 4;
230 return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
231}
232static DEVICE_ATTR_RO(cpu0_vid);
233
234static ssize_t aout_output_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236{
237 struct adm9240_data *data = dev_get_drvdata(dev);
238 unsigned int regval;
239 int err;
240
241 err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, ®val);
242 if (err)
243 return err;
244
245 return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
246}
247
248static ssize_t aout_output_store(struct device *dev,
249 struct device_attribute *attr,
250 const char *buf, size_t count)
251{
252 struct adm9240_data *data = dev_get_drvdata(dev);
253 long val;
254 int err;
255
256 err = kstrtol(buf, 10, &val);
257 if (err)
258 return err;
259
260 err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
261 return err < 0 ? err : count;
262}
263static DEVICE_ATTR_RW(aout_output);
264
265static struct attribute *adm9240_attrs[] = {
266 &dev_attr_aout_output.attr,
267 &dev_attr_cpu0_vid.attr,
268 NULL
269};
270
271ATTRIBUTE_GROUPS(adm9240);
272
273/*** sensor chip detect and driver install ***/
274
275/* Return 0 if detection is successful, -ENODEV otherwise */
276static int adm9240_detect(struct i2c_client *new_client,
277 struct i2c_board_info *info)
278{
279 struct i2c_adapter *adapter = new_client->adapter;
280 const char *name = "";
281 int address = new_client->addr;
282 u8 man_id, die_rev;
283
284 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
285 return -ENODEV;
286
287 /* verify chip: reg address should match i2c address */
288 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
289 return -ENODEV;
290
291 /* check known chip manufacturer */
292 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
293 if (man_id == 0x23)
294 name = "adm9240";
295 else if (man_id == 0xda)
296 name = "ds1780";
297 else if (man_id == 0x01)
298 name = "lm81";
299 else
300 return -ENODEV;
301
302 /* successful detect, print chip info */
303 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
304 dev_info(&adapter->dev, "found %s revision %u\n",
305 man_id == 0x23 ? "ADM9240" :
306 man_id == 0xda ? "DS1780" : "LM81", die_rev);
307
308 strscpy(info->type, name, I2C_NAME_SIZE);
309
310 return 0;
311}
312
313static int adm9240_init_client(struct adm9240_data *data)
314{
315 unsigned int regval;
316 u8 conf, mode;
317 int err;
318
319 err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
320 if (err < 0)
321 return err;
322 err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
323 if (err < 0)
324 return err;
325 mode &= 3;
326
327 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
328
329 dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
330 data->vrm % 10);
331
332 if (conf & 1) { /* measurement cycle running: report state */
333
334 dev_info(data->dev, "status: config 0x%02x mode %u\n",
335 conf, mode);
336
337 } else { /* cold start: open limits before starting chip */
338 int i;
339
340 for (i = 0; i < 6; i++) {
341 err = regmap_write(data->regmap,
342 ADM9240_REG_IN_MIN(i), 0);
343 if (err < 0)
344 return err;
345 err = regmap_write(data->regmap,
346 ADM9240_REG_IN_MAX(i), 255);
347 if (err < 0)
348 return err;
349 }
350 for (i = 0; i < 2; i++) {
351 err = regmap_write(data->regmap,
352 ADM9240_REG_FAN_MIN(i), 255);
353 if (err < 0)
354 return err;
355 }
356 for (i = 0; i < 2; i++) {
357 err = regmap_write(data->regmap,
358 ADM9240_REG_TEMP_MAX(i), 127);
359 if (err < 0)
360 return err;
361 }
362
363 /* start measurement cycle */
364 err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
365 if (err < 0)
366 return err;
367
368 dev_info(data->dev,
369 "cold start: config was 0x%02x mode %u\n", conf, mode);
370 }
371
372 /* read fan divs */
373 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®val);
374 if (err < 0)
375 return err;
376 data->fan_div[0] = (regval >> 4) & 3;
377 data->fan_div[1] = (regval >> 6) & 3;
378 return 0;
379}
380
381static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
382{
383 struct adm9240_data *data = dev_get_drvdata(dev);
384 u8 regs[2];
385 int err;
386
387 switch (attr) {
388 case hwmon_chip_alarms:
389 err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), ®s, 2);
390 if (err < 0)
391 return err;
392 *val = regs[0] | regs[1] << 8;
393 break;
394 default:
395 return -EOPNOTSUPP;
396 }
397 return 0;
398}
399
400static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
401{
402 struct adm9240_data *data = dev_get_drvdata(dev);
403 unsigned int regval;
404 int err;
405
406 switch (attr) {
407 case hwmon_intrusion_alarm:
408 err = regmap_read(data->regmap, ADM9240_REG_INT(1), ®val);
409 if (err < 0)
410 return err;
411 *val = !!(regval & BIT(4));
412 break;
413 default:
414 return -EOPNOTSUPP;
415 }
416 return 0;
417}
418
419static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
420{
421 struct adm9240_data *data = dev_get_drvdata(dev);
422 int err;
423
424 switch (attr) {
425 case hwmon_intrusion_alarm:
426 if (val)
427 return -EINVAL;
428 err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
429 if (err < 0)
430 return err;
431 dev_dbg(data->dev, "chassis intrusion latch cleared\n");
432 break;
433 default:
434 return -EOPNOTSUPP;
435 }
436 return 0;
437}
438
439static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
440{
441 struct adm9240_data *data = dev_get_drvdata(dev);
442 unsigned int regval;
443 int reg;
444 int err;
445
446 switch (attr) {
447 case hwmon_in_input:
448 reg = ADM9240_REG_IN(channel);
449 break;
450 case hwmon_in_min:
451 reg = ADM9240_REG_IN_MIN(channel);
452 break;
453 case hwmon_in_max:
454 reg = ADM9240_REG_IN_MAX(channel);
455 break;
456 case hwmon_in_alarm:
457 if (channel < 4) {
458 reg = ADM9240_REG_INT(0);
459 } else {
460 reg = ADM9240_REG_INT(1);
461 channel -= 4;
462 }
463 err = regmap_read(data->regmap, reg, ®val);
464 if (err < 0)
465 return err;
466 *val = !!(regval & BIT(channel));
467 return 0;
468 default:
469 return -EOPNOTSUPP;
470 }
471 err = regmap_read(data->regmap, reg, ®val);
472 if (err < 0)
473 return err;
474 *val = IN_FROM_REG(regval, channel);
475 return 0;
476}
477
478static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
479{
480 struct adm9240_data *data = dev_get_drvdata(dev);
481 int reg;
482
483 switch (attr) {
484 case hwmon_in_min:
485 reg = ADM9240_REG_IN_MIN(channel);
486 break;
487 case hwmon_in_max:
488 reg = ADM9240_REG_IN_MAX(channel);
489 break;
490 default:
491 return -EOPNOTSUPP;
492 }
493 return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
494}
495
496static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
497{
498 struct adm9240_data *data = dev_get_drvdata(dev);
499 unsigned int regval;
500 int err;
501
502 switch (attr) {
503 case hwmon_fan_input:
504 mutex_lock(&data->update_lock);
505 err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), ®val);
506 if (err < 0) {
507 mutex_unlock(&data->update_lock);
508 return err;
509 }
510 if (regval == 255 && data->fan_div[channel] < 3) {
511 /* adjust fan clock divider on overflow */
512 err = adm9240_write_fan_div(data, channel,
513 ++data->fan_div[channel]);
514 if (err) {
515 mutex_unlock(&data->update_lock);
516 return err;
517 }
518 }
519 *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
520 mutex_unlock(&data->update_lock);
521 break;
522 case hwmon_fan_div:
523 *val = BIT(data->fan_div[channel]);
524 break;
525 case hwmon_fan_min:
526 err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), ®val);
527 if (err < 0)
528 return err;
529 *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
530 break;
531 case hwmon_fan_alarm:
532 err = regmap_read(data->regmap, ADM9240_REG_INT(0), ®val);
533 if (err < 0)
534 return err;
535 *val = !!(regval & BIT(channel + 6));
536 break;
537 default:
538 return -EOPNOTSUPP;
539 }
540 return 0;
541}
542
543static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
544{
545 struct adm9240_data *data = dev_get_drvdata(dev);
546 int err;
547
548 switch (attr) {
549 case hwmon_fan_min:
550 err = adm9240_fan_min_write(data, channel, val);
551 if (err < 0)
552 return err;
553 break;
554 default:
555 return -EOPNOTSUPP;
556 }
557 return 0;
558}
559
560static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
561{
562 struct adm9240_data *data = dev_get_drvdata(dev);
563 unsigned int regval;
564 int err, temp;
565
566 switch (attr) {
567 case hwmon_temp_input:
568 err = regmap_read(data->regmap, ADM9240_REG_TEMP, ®val);
569 if (err < 0)
570 return err;
571 temp = regval << 1;
572 err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, ®val);
573 if (err < 0)
574 return err;
575 temp |= regval >> 7;
576 *val = sign_extend32(temp, 8) * 500;
577 break;
578 case hwmon_temp_max:
579 err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), ®val);
580 if (err < 0)
581 return err;
582 *val = (s8)regval * 1000;
583 break;
584 case hwmon_temp_max_hyst:
585 err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), ®val);
586 if (err < 0)
587 return err;
588 *val = (s8)regval * 1000;
589 break;
590 case hwmon_temp_alarm:
591 err = regmap_read(data->regmap, ADM9240_REG_INT(0), ®val);
592 if (err < 0)
593 return err;
594 *val = !!(regval & BIT(4));
595 break;
596 default:
597 return -EOPNOTSUPP;
598 }
599 return 0;
600}
601
602static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
603{
604 struct adm9240_data *data = dev_get_drvdata(dev);
605 int reg;
606
607 switch (attr) {
608 case hwmon_temp_max:
609 reg = ADM9240_REG_TEMP_MAX(0);
610 break;
611 case hwmon_temp_max_hyst:
612 reg = ADM9240_REG_TEMP_MAX(1);
613 break;
614 default:
615 return -EOPNOTSUPP;
616 }
617 return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
618}
619
620static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
621 int channel, long *val)
622{
623 switch (type) {
624 case hwmon_chip:
625 return adm9240_chip_read(dev, attr, val);
626 case hwmon_intrusion:
627 return adm9240_intrusion_read(dev, attr, val);
628 case hwmon_in:
629 return adm9240_in_read(dev, attr, channel, val);
630 case hwmon_fan:
631 return adm9240_fan_read(dev, attr, channel, val);
632 case hwmon_temp:
633 return adm9240_temp_read(dev, attr, channel, val);
634 default:
635 return -EOPNOTSUPP;
636 }
637}
638
639static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
640 int channel, long val)
641{
642 switch (type) {
643 case hwmon_intrusion:
644 return adm9240_intrusion_write(dev, attr, val);
645 case hwmon_in:
646 return adm9240_in_write(dev, attr, channel, val);
647 case hwmon_fan:
648 return adm9240_fan_write(dev, attr, channel, val);
649 case hwmon_temp:
650 return adm9240_temp_write(dev, attr, channel, val);
651 default:
652 return -EOPNOTSUPP;
653 }
654}
655
656static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
657 u32 attr, int channel)
658{
659 umode_t mode = 0;
660
661 switch (type) {
662 case hwmon_chip:
663 switch (attr) {
664 case hwmon_chip_alarms:
665 mode = 0444;
666 break;
667 default:
668 break;
669 }
670 break;
671 case hwmon_intrusion:
672 switch (attr) {
673 case hwmon_intrusion_alarm:
674 mode = 0644;
675 break;
676 default:
677 break;
678 }
679 break;
680 case hwmon_temp:
681 switch (attr) {
682 case hwmon_temp:
683 case hwmon_temp_alarm:
684 mode = 0444;
685 break;
686 case hwmon_temp_max:
687 case hwmon_temp_max_hyst:
688 mode = 0644;
689 break;
690 default:
691 break;
692 }
693 break;
694 case hwmon_fan:
695 switch (attr) {
696 case hwmon_fan_input:
697 case hwmon_fan_div:
698 case hwmon_fan_alarm:
699 mode = 0444;
700 break;
701 case hwmon_fan_min:
702 mode = 0644;
703 break;
704 default:
705 break;
706 }
707 break;
708 case hwmon_in:
709 switch (attr) {
710 case hwmon_in_input:
711 case hwmon_in_alarm:
712 mode = 0444;
713 break;
714 case hwmon_in_min:
715 case hwmon_in_max:
716 mode = 0644;
717 break;
718 default:
719 break;
720 }
721 break;
722 default:
723 break;
724 }
725 return mode;
726}
727
728static const struct hwmon_ops adm9240_hwmon_ops = {
729 .is_visible = adm9240_is_visible,
730 .read = adm9240_read,
731 .write = adm9240_write,
732};
733
734static const struct hwmon_channel_info * const adm9240_info[] = {
735 HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
736 HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
737 HWMON_CHANNEL_INFO(temp,
738 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
739 HWMON_CHANNEL_INFO(in,
740 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
741 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
742 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
743 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
744 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
745 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
746 HWMON_CHANNEL_INFO(fan,
747 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
748 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
749 NULL
750};
751
752static const struct hwmon_chip_info adm9240_chip_info = {
753 .ops = &adm9240_hwmon_ops,
754 .info = adm9240_info,
755};
756
757static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
758{
759 switch (reg) {
760 case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
761 case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
762 case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
763 case ADM9240_REG_TEMP:
764 case ADM9240_REG_TEMP_CONF:
765 case ADM9240_REG_VID_FAN_DIV:
766 case ADM9240_REG_VID4:
767 case ADM9240_REG_ANALOG_OUT:
768 return true;
769 default:
770 return false;
771 }
772}
773
774static const struct regmap_config adm9240_regmap_config = {
775 .reg_bits = 8,
776 .val_bits = 8,
777 .use_single_read = true,
778 .use_single_write = true,
779 .volatile_reg = adm9240_volatile_reg,
780};
781
782static int adm9240_probe(struct i2c_client *client)
783{
784 struct device *dev = &client->dev;
785 struct device *hwmon_dev;
786 struct adm9240_data *data;
787 int err;
788
789 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
790 if (!data)
791 return -ENOMEM;
792
793 data->dev = dev;
794 mutex_init(&data->update_lock);
795 data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
796 if (IS_ERR(data->regmap))
797 return PTR_ERR(data->regmap);
798
799 err = adm9240_init_client(data);
800 if (err < 0)
801 return err;
802
803 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
804 &adm9240_chip_info,
805 adm9240_groups);
806 return PTR_ERR_OR_ZERO(hwmon_dev);
807}
808
809static const struct i2c_device_id adm9240_id[] = {
810 { "adm9240", adm9240 },
811 { "ds1780", ds1780 },
812 { "lm81", lm81 },
813 { }
814};
815MODULE_DEVICE_TABLE(i2c, adm9240_id);
816
817static struct i2c_driver adm9240_driver = {
818 .class = I2C_CLASS_HWMON,
819 .driver = {
820 .name = "adm9240",
821 },
822 .probe = adm9240_probe,
823 .id_table = adm9240_id,
824 .detect = adm9240_detect,
825 .address_list = normal_i2c,
826};
827
828module_i2c_driver(adm9240_driver);
829
830MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
831 "Grant Coady <gcoady.lk@gmail.com> and others");
832MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
833MODULE_LICENSE("GPL");