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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#include <linux/jiffies.h>
54
55/* Addresses to scan */
56static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
57 I2C_CLIENT_END };
58
59enum chips { adm9240, ds1780, lm81 };
60
61/* ADM9240 registers */
62#define ADM9240_REG_MAN_ID 0x3e
63#define ADM9240_REG_DIE_REV 0x3f
64#define ADM9240_REG_CONFIG 0x40
65
66#define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
67#define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
68#define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
69#define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
70#define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
71#define ADM9240_REG_INT(nr) (0x41 + (nr))
72#define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
73#define ADM9240_REG_TEMP 0x27
74#define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
75#define ADM9240_REG_ANALOG_OUT 0x19
76#define ADM9240_REG_CHASSIS_CLEAR 0x46
77#define ADM9240_REG_VID_FAN_DIV 0x47
78#define ADM9240_REG_I2C_ADDR 0x48
79#define ADM9240_REG_VID4 0x49
80#define ADM9240_REG_TEMP_CONF 0x4b
81
82/* generalised scaling with integer rounding */
83static inline int SCALE(long val, int mul, int div)
84{
85 if (val < 0)
86 return (val * mul - div / 2) / div;
87 else
88 return (val * mul + div / 2) / div;
89}
90
91/* adm9240 internally scales voltage measurements */
92static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
93
94static inline unsigned int IN_FROM_REG(u8 reg, int n)
95{
96 return SCALE(reg, nom_mv[n], 192);
97}
98
99static inline u8 IN_TO_REG(unsigned long val, int n)
100{
101 return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255);
102}
103
104/* temperature range: -40..125, 127 disables temperature alarm */
105static inline s8 TEMP_TO_REG(long val)
106{
107 return clamp_val(SCALE(val, 1, 1000), -40, 127);
108}
109
110/* two fans, each with low fan speed limit */
111static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
112{
113 if (!reg) /* error */
114 return -1;
115
116 if (reg == 255)
117 return 0;
118
119 return SCALE(1350000, 1, reg * div);
120}
121
122/* analog out 0..1250mV */
123static inline u8 AOUT_TO_REG(unsigned long val)
124{
125 return clamp_val(SCALE(val, 255, 1250), 0, 255);
126}
127
128static inline unsigned int AOUT_FROM_REG(u8 reg)
129{
130 return SCALE(reg, 1250, 255);
131}
132
133/* per client data */
134struct adm9240_data {
135 struct i2c_client *client;
136 struct mutex update_lock;
137 char valid;
138 unsigned long last_updated_measure;
139 unsigned long last_updated_config;
140
141 u8 in[6]; /* ro in0_input */
142 u8 in_max[6]; /* rw in0_max */
143 u8 in_min[6]; /* rw in0_min */
144 u8 fan[2]; /* ro fan1_input */
145 u8 fan_min[2]; /* rw fan1_min */
146 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
147 s16 temp; /* ro temp1_input, 9-bit sign-extended */
148 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
149 u16 alarms; /* ro alarms */
150 u8 aout; /* rw aout_output */
151 u8 vid; /* ro vid */
152 u8 vrm; /* -- vrm set on startup, no accessor */
153};
154
155/* write new fan div, callers must hold data->update_lock */
156static void adm9240_write_fan_div(struct i2c_client *client, int nr,
157 u8 fan_div)
158{
159 u8 reg, old, shift = (nr + 2) * 2;
160
161 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
162 old = (reg >> shift) & 3;
163 reg &= ~(3 << shift);
164 reg |= (fan_div << shift);
165 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
166 dev_dbg(&client->dev,
167 "fan%d clock divider changed from %u to %u\n",
168 nr + 1, 1 << old, 1 << fan_div);
169}
170
171static struct adm9240_data *adm9240_update_device(struct device *dev)
172{
173 struct adm9240_data *data = dev_get_drvdata(dev);
174 struct i2c_client *client = data->client;
175 int i;
176
177 mutex_lock(&data->update_lock);
178
179 /* minimum measurement cycle: 1.75 seconds */
180 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
181 || !data->valid) {
182
183 for (i = 0; i < 6; i++) { /* read voltages */
184 data->in[i] = i2c_smbus_read_byte_data(client,
185 ADM9240_REG_IN(i));
186 }
187 data->alarms = i2c_smbus_read_byte_data(client,
188 ADM9240_REG_INT(0)) |
189 i2c_smbus_read_byte_data(client,
190 ADM9240_REG_INT(1)) << 8;
191
192 /*
193 * read temperature: assume temperature changes less than
194 * 0.5'C per two measurement cycles thus ignore possible
195 * but unlikely aliasing error on lsb reading. --Grant
196 */
197 data->temp = ((i2c_smbus_read_byte_data(client,
198 ADM9240_REG_TEMP) << 8) |
199 i2c_smbus_read_byte_data(client,
200 ADM9240_REG_TEMP_CONF)) / 128;
201
202 for (i = 0; i < 2; i++) { /* read fans */
203 data->fan[i] = i2c_smbus_read_byte_data(client,
204 ADM9240_REG_FAN(i));
205
206 /* adjust fan clock divider on overflow */
207 if (data->valid && data->fan[i] == 255 &&
208 data->fan_div[i] < 3) {
209
210 adm9240_write_fan_div(client, i,
211 ++data->fan_div[i]);
212
213 /* adjust fan_min if active, but not to 0 */
214 if (data->fan_min[i] < 255 &&
215 data->fan_min[i] >= 2)
216 data->fan_min[i] /= 2;
217 }
218 }
219 data->last_updated_measure = jiffies;
220 }
221
222 /* minimum config reading cycle: 300 seconds */
223 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
224 || !data->valid) {
225
226 for (i = 0; i < 6; i++) {
227 data->in_min[i] = i2c_smbus_read_byte_data(client,
228 ADM9240_REG_IN_MIN(i));
229 data->in_max[i] = i2c_smbus_read_byte_data(client,
230 ADM9240_REG_IN_MAX(i));
231 }
232 for (i = 0; i < 2; i++) {
233 data->fan_min[i] = i2c_smbus_read_byte_data(client,
234 ADM9240_REG_FAN_MIN(i));
235 }
236 data->temp_max[0] = i2c_smbus_read_byte_data(client,
237 ADM9240_REG_TEMP_MAX(0));
238 data->temp_max[1] = i2c_smbus_read_byte_data(client,
239 ADM9240_REG_TEMP_MAX(1));
240
241 /* read fan divs and 5-bit VID */
242 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
243 data->fan_div[0] = (i >> 4) & 3;
244 data->fan_div[1] = (i >> 6) & 3;
245 data->vid = i & 0x0f;
246 data->vid |= (i2c_smbus_read_byte_data(client,
247 ADM9240_REG_VID4) & 1) << 4;
248 /* read analog out */
249 data->aout = i2c_smbus_read_byte_data(client,
250 ADM9240_REG_ANALOG_OUT);
251
252 data->last_updated_config = jiffies;
253 data->valid = 1;
254 }
255 mutex_unlock(&data->update_lock);
256 return data;
257}
258
259/*** sysfs accessors ***/
260
261/* temperature */
262static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
263 char *buf)
264{
265 struct adm9240_data *data = adm9240_update_device(dev);
266 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
267}
268
269static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
270 char *buf)
271{
272 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
273 struct adm9240_data *data = adm9240_update_device(dev);
274 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
275}
276
277static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
278 const char *buf, size_t count)
279{
280 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
281 struct adm9240_data *data = dev_get_drvdata(dev);
282 struct i2c_client *client = data->client;
283 long val;
284 int err;
285
286 err = kstrtol(buf, 10, &val);
287 if (err)
288 return err;
289
290 mutex_lock(&data->update_lock);
291 data->temp_max[attr->index] = TEMP_TO_REG(val);
292 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
293 data->temp_max[attr->index]);
294 mutex_unlock(&data->update_lock);
295 return count;
296}
297
298static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
299static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
300 show_max, set_max, 0);
301static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
302 show_max, set_max, 1);
303
304/* voltage */
305static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
306 char *buf)
307{
308 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
309 struct adm9240_data *data = adm9240_update_device(dev);
310 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
311 attr->index));
312}
313
314static ssize_t show_in_min(struct device *dev,
315 struct device_attribute *devattr, char *buf)
316{
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
318 struct adm9240_data *data = adm9240_update_device(dev);
319 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
320 attr->index));
321}
322
323static ssize_t show_in_max(struct device *dev,
324 struct device_attribute *devattr, char *buf)
325{
326 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
327 struct adm9240_data *data = adm9240_update_device(dev);
328 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
329 attr->index));
330}
331
332static ssize_t set_in_min(struct device *dev,
333 struct device_attribute *devattr,
334 const char *buf, size_t count)
335{
336 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
337 struct adm9240_data *data = dev_get_drvdata(dev);
338 struct i2c_client *client = data->client;
339 unsigned long val;
340 int err;
341
342 err = kstrtoul(buf, 10, &val);
343 if (err)
344 return err;
345
346 mutex_lock(&data->update_lock);
347 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
348 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
349 data->in_min[attr->index]);
350 mutex_unlock(&data->update_lock);
351 return count;
352}
353
354static ssize_t set_in_max(struct device *dev,
355 struct device_attribute *devattr,
356 const char *buf, size_t count)
357{
358 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
359 struct adm9240_data *data = dev_get_drvdata(dev);
360 struct i2c_client *client = data->client;
361 unsigned long val;
362 int err;
363
364 err = kstrtoul(buf, 10, &val);
365 if (err)
366 return err;
367
368 mutex_lock(&data->update_lock);
369 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
370 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
371 data->in_max[attr->index]);
372 mutex_unlock(&data->update_lock);
373 return count;
374}
375
376#define vin(nr) \
377static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
378 show_in, NULL, nr); \
379static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
380 show_in_min, set_in_min, nr); \
381static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
382 show_in_max, set_in_max, nr);
383
384vin(0);
385vin(1);
386vin(2);
387vin(3);
388vin(4);
389vin(5);
390
391/* fans */
392static ssize_t show_fan(struct device *dev,
393 struct device_attribute *devattr, char *buf)
394{
395 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
396 struct adm9240_data *data = adm9240_update_device(dev);
397 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
398 1 << data->fan_div[attr->index]));
399}
400
401static ssize_t show_fan_min(struct device *dev,
402 struct device_attribute *devattr, char *buf)
403{
404 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
405 struct adm9240_data *data = adm9240_update_device(dev);
406 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
407 1 << data->fan_div[attr->index]));
408}
409
410static ssize_t show_fan_div(struct device *dev,
411 struct device_attribute *devattr, char *buf)
412{
413 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
414 struct adm9240_data *data = adm9240_update_device(dev);
415 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
416}
417
418/*
419 * set fan speed low limit:
420 *
421 * - value is zero: disable fan speed low limit alarm
422 *
423 * - value is below fan speed measurement range: enable fan speed low
424 * limit alarm to be asserted while fan speed too slow to measure
425 *
426 * - otherwise: select fan clock divider to suit fan speed low limit,
427 * measurement code may adjust registers to ensure fan speed reading
428 */
429static ssize_t set_fan_min(struct device *dev,
430 struct device_attribute *devattr,
431 const char *buf, size_t count)
432{
433 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
434 struct adm9240_data *data = dev_get_drvdata(dev);
435 struct i2c_client *client = data->client;
436 int nr = attr->index;
437 u8 new_div;
438 unsigned long val;
439 int err;
440
441 err = kstrtoul(buf, 10, &val);
442 if (err)
443 return err;
444
445 mutex_lock(&data->update_lock);
446
447 if (!val) {
448 data->fan_min[nr] = 255;
449 new_div = data->fan_div[nr];
450
451 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
452 nr + 1);
453
454 } else if (val < 1350000 / (8 * 254)) {
455 new_div = 3;
456 data->fan_min[nr] = 254;
457
458 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
459 nr + 1, FAN_FROM_REG(254, 1 << new_div));
460
461 } else {
462 unsigned int new_min = 1350000 / val;
463
464 new_div = 0;
465 while (new_min > 192 && new_div < 3) {
466 new_div++;
467 new_min /= 2;
468 }
469 if (!new_min) /* keep > 0 */
470 new_min++;
471
472 data->fan_min[nr] = new_min;
473
474 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
475 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
476 }
477
478 if (new_div != data->fan_div[nr]) {
479 data->fan_div[nr] = new_div;
480 adm9240_write_fan_div(client, nr, new_div);
481 }
482 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
483 data->fan_min[nr]);
484
485 mutex_unlock(&data->update_lock);
486 return count;
487}
488
489#define fan(nr) \
490static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
491 show_fan, NULL, nr - 1); \
492static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
493 show_fan_div, NULL, nr - 1); \
494static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
495 show_fan_min, set_fan_min, nr - 1);
496
497fan(1);
498fan(2);
499
500/* alarms */
501static ssize_t show_alarms(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
504 struct adm9240_data *data = adm9240_update_device(dev);
505 return sprintf(buf, "%u\n", data->alarms);
506}
507static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
508
509static ssize_t show_alarm(struct device *dev,
510 struct device_attribute *attr, char *buf)
511{
512 int bitnr = to_sensor_dev_attr(attr)->index;
513 struct adm9240_data *data = adm9240_update_device(dev);
514 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
515}
516static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
517static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
518static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
519static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
520static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
521static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
522static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
523static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
524static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
525
526/* vid */
527static ssize_t show_vid(struct device *dev,
528 struct device_attribute *attr, char *buf)
529{
530 struct adm9240_data *data = adm9240_update_device(dev);
531 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
532}
533static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
534
535/* analog output */
536static ssize_t show_aout(struct device *dev,
537 struct device_attribute *attr, char *buf)
538{
539 struct adm9240_data *data = adm9240_update_device(dev);
540 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
541}
542
543static ssize_t set_aout(struct device *dev,
544 struct device_attribute *attr,
545 const char *buf, size_t count)
546{
547 struct adm9240_data *data = dev_get_drvdata(dev);
548 struct i2c_client *client = data->client;
549 long val;
550 int err;
551
552 err = kstrtol(buf, 10, &val);
553 if (err)
554 return err;
555
556 mutex_lock(&data->update_lock);
557 data->aout = AOUT_TO_REG(val);
558 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
559 mutex_unlock(&data->update_lock);
560 return count;
561}
562static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
563
564static ssize_t chassis_clear(struct device *dev,
565 struct device_attribute *attr,
566 const char *buf, size_t count)
567{
568 struct adm9240_data *data = dev_get_drvdata(dev);
569 struct i2c_client *client = data->client;
570 unsigned long val;
571
572 if (kstrtoul(buf, 10, &val) || val != 0)
573 return -EINVAL;
574
575 mutex_lock(&data->update_lock);
576 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
577 data->valid = 0; /* Force cache refresh */
578 mutex_unlock(&data->update_lock);
579 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
580
581 return count;
582}
583static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
584 chassis_clear, 12);
585
586static struct attribute *adm9240_attrs[] = {
587 &sensor_dev_attr_in0_input.dev_attr.attr,
588 &sensor_dev_attr_in0_min.dev_attr.attr,
589 &sensor_dev_attr_in0_max.dev_attr.attr,
590 &sensor_dev_attr_in0_alarm.dev_attr.attr,
591 &sensor_dev_attr_in1_input.dev_attr.attr,
592 &sensor_dev_attr_in1_min.dev_attr.attr,
593 &sensor_dev_attr_in1_max.dev_attr.attr,
594 &sensor_dev_attr_in1_alarm.dev_attr.attr,
595 &sensor_dev_attr_in2_input.dev_attr.attr,
596 &sensor_dev_attr_in2_min.dev_attr.attr,
597 &sensor_dev_attr_in2_max.dev_attr.attr,
598 &sensor_dev_attr_in2_alarm.dev_attr.attr,
599 &sensor_dev_attr_in3_input.dev_attr.attr,
600 &sensor_dev_attr_in3_min.dev_attr.attr,
601 &sensor_dev_attr_in3_max.dev_attr.attr,
602 &sensor_dev_attr_in3_alarm.dev_attr.attr,
603 &sensor_dev_attr_in4_input.dev_attr.attr,
604 &sensor_dev_attr_in4_min.dev_attr.attr,
605 &sensor_dev_attr_in4_max.dev_attr.attr,
606 &sensor_dev_attr_in4_alarm.dev_attr.attr,
607 &sensor_dev_attr_in5_input.dev_attr.attr,
608 &sensor_dev_attr_in5_min.dev_attr.attr,
609 &sensor_dev_attr_in5_max.dev_attr.attr,
610 &sensor_dev_attr_in5_alarm.dev_attr.attr,
611 &dev_attr_temp1_input.attr,
612 &sensor_dev_attr_temp1_max.dev_attr.attr,
613 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
614 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
615 &sensor_dev_attr_fan1_input.dev_attr.attr,
616 &sensor_dev_attr_fan1_div.dev_attr.attr,
617 &sensor_dev_attr_fan1_min.dev_attr.attr,
618 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
619 &sensor_dev_attr_fan2_input.dev_attr.attr,
620 &sensor_dev_attr_fan2_div.dev_attr.attr,
621 &sensor_dev_attr_fan2_min.dev_attr.attr,
622 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
623 &dev_attr_alarms.attr,
624 &dev_attr_aout_output.attr,
625 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
626 &dev_attr_cpu0_vid.attr,
627 NULL
628};
629
630ATTRIBUTE_GROUPS(adm9240);
631
632
633/*** sensor chip detect and driver install ***/
634
635/* Return 0 if detection is successful, -ENODEV otherwise */
636static int adm9240_detect(struct i2c_client *new_client,
637 struct i2c_board_info *info)
638{
639 struct i2c_adapter *adapter = new_client->adapter;
640 const char *name = "";
641 int address = new_client->addr;
642 u8 man_id, die_rev;
643
644 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
645 return -ENODEV;
646
647 /* verify chip: reg address should match i2c address */
648 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
649 != address) {
650 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
651 address);
652 return -ENODEV;
653 }
654
655 /* check known chip manufacturer */
656 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
657 if (man_id == 0x23) {
658 name = "adm9240";
659 } else if (man_id == 0xda) {
660 name = "ds1780";
661 } else if (man_id == 0x01) {
662 name = "lm81";
663 } else {
664 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
665 man_id);
666 return -ENODEV;
667 }
668
669 /* successful detect, print chip info */
670 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
671 dev_info(&adapter->dev, "found %s revision %u\n",
672 man_id == 0x23 ? "ADM9240" :
673 man_id == 0xda ? "DS1780" : "LM81", die_rev);
674
675 strlcpy(info->type, name, I2C_NAME_SIZE);
676
677 return 0;
678}
679
680static void adm9240_init_client(struct i2c_client *client)
681{
682 struct adm9240_data *data = i2c_get_clientdata(client);
683 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
684 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
685
686 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
687
688 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
689 data->vrm % 10);
690
691 if (conf & 1) { /* measurement cycle running: report state */
692
693 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
694 conf, mode);
695
696 } else { /* cold start: open limits before starting chip */
697 int i;
698
699 for (i = 0; i < 6; i++) {
700 i2c_smbus_write_byte_data(client,
701 ADM9240_REG_IN_MIN(i), 0);
702 i2c_smbus_write_byte_data(client,
703 ADM9240_REG_IN_MAX(i), 255);
704 }
705 i2c_smbus_write_byte_data(client,
706 ADM9240_REG_FAN_MIN(0), 255);
707 i2c_smbus_write_byte_data(client,
708 ADM9240_REG_FAN_MIN(1), 255);
709 i2c_smbus_write_byte_data(client,
710 ADM9240_REG_TEMP_MAX(0), 127);
711 i2c_smbus_write_byte_data(client,
712 ADM9240_REG_TEMP_MAX(1), 127);
713
714 /* start measurement cycle */
715 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
716
717 dev_info(&client->dev,
718 "cold start: config was 0x%02x mode %u\n", conf, mode);
719 }
720}
721
722static int adm9240_probe(struct i2c_client *new_client,
723 const struct i2c_device_id *id)
724{
725 struct device *dev = &new_client->dev;
726 struct device *hwmon_dev;
727 struct adm9240_data *data;
728
729 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
730 if (!data)
731 return -ENOMEM;
732
733 i2c_set_clientdata(new_client, data);
734 data->client = new_client;
735 mutex_init(&data->update_lock);
736
737 adm9240_init_client(new_client);
738
739 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
740 new_client->name,
741 data,
742 adm9240_groups);
743 return PTR_ERR_OR_ZERO(hwmon_dev);
744}
745
746static const struct i2c_device_id adm9240_id[] = {
747 { "adm9240", adm9240 },
748 { "ds1780", ds1780 },
749 { "lm81", lm81 },
750 { }
751};
752MODULE_DEVICE_TABLE(i2c, adm9240_id);
753
754static struct i2c_driver adm9240_driver = {
755 .class = I2C_CLASS_HWMON,
756 .driver = {
757 .name = "adm9240",
758 },
759 .probe = adm9240_probe,
760 .id_table = adm9240_id,
761 .detect = adm9240_detect,
762 .address_list = normal_i2c,
763};
764
765module_i2c_driver(adm9240_driver);
766
767MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
768 "Grant Coady <gcoady.lk@gmail.com> and others");
769MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
770MODULE_LICENSE("GPL");
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");