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 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
102 return SCALE(val, 192, nom_mv[n]);
103}
104
105/* temperature range: -40..125, 127 disables temperature alarm */
106static inline s8 TEMP_TO_REG(long val)
107{
108 val = clamp_val(val, -40000, 127000);
109 return SCALE(val, 1, 1000);
110}
111
112/* two fans, each with low fan speed limit */
113static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
114{
115 if (!reg) /* error */
116 return -1;
117
118 if (reg == 255)
119 return 0;
120
121 return SCALE(1350000, 1, reg * div);
122}
123
124/* analog out 0..1250mV */
125static inline u8 AOUT_TO_REG(unsigned long val)
126{
127 val = clamp_val(val, 0, 1250);
128 return SCALE(val, 255, 1250);
129}
130
131static inline unsigned int AOUT_FROM_REG(u8 reg)
132{
133 return SCALE(reg, 1250, 255);
134}
135
136/* per client data */
137struct adm9240_data {
138 struct i2c_client *client;
139 struct mutex update_lock;
140 char valid;
141 unsigned long last_updated_measure;
142 unsigned long last_updated_config;
143
144 u8 in[6]; /* ro in0_input */
145 u8 in_max[6]; /* rw in0_max */
146 u8 in_min[6]; /* rw in0_min */
147 u8 fan[2]; /* ro fan1_input */
148 u8 fan_min[2]; /* rw fan1_min */
149 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
150 s16 temp; /* ro temp1_input, 9-bit sign-extended */
151 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
152 u16 alarms; /* ro alarms */
153 u8 aout; /* rw aout_output */
154 u8 vid; /* ro vid */
155 u8 vrm; /* -- vrm set on startup, no accessor */
156};
157
158/* write new fan div, callers must hold data->update_lock */
159static void adm9240_write_fan_div(struct i2c_client *client, int nr,
160 u8 fan_div)
161{
162 u8 reg, old, shift = (nr + 2) * 2;
163
164 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
165 old = (reg >> shift) & 3;
166 reg &= ~(3 << shift);
167 reg |= (fan_div << shift);
168 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
169 dev_dbg(&client->dev,
170 "fan%d clock divider changed from %u to %u\n",
171 nr + 1, 1 << old, 1 << fan_div);
172}
173
174static struct adm9240_data *adm9240_update_device(struct device *dev)
175{
176 struct adm9240_data *data = dev_get_drvdata(dev);
177 struct i2c_client *client = data->client;
178 int i;
179
180 mutex_lock(&data->update_lock);
181
182 /* minimum measurement cycle: 1.75 seconds */
183 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
184 || !data->valid) {
185
186 for (i = 0; i < 6; i++) { /* read voltages */
187 data->in[i] = i2c_smbus_read_byte_data(client,
188 ADM9240_REG_IN(i));
189 }
190 data->alarms = i2c_smbus_read_byte_data(client,
191 ADM9240_REG_INT(0)) |
192 i2c_smbus_read_byte_data(client,
193 ADM9240_REG_INT(1)) << 8;
194
195 /*
196 * read temperature: assume temperature changes less than
197 * 0.5'C per two measurement cycles thus ignore possible
198 * but unlikely aliasing error on lsb reading. --Grant
199 */
200 data->temp = (i2c_smbus_read_byte_data(client,
201 ADM9240_REG_TEMP) << 8) |
202 i2c_smbus_read_byte_data(client,
203 ADM9240_REG_TEMP_CONF);
204
205 for (i = 0; i < 2; i++) { /* read fans */
206 data->fan[i] = i2c_smbus_read_byte_data(client,
207 ADM9240_REG_FAN(i));
208
209 /* adjust fan clock divider on overflow */
210 if (data->valid && data->fan[i] == 255 &&
211 data->fan_div[i] < 3) {
212
213 adm9240_write_fan_div(client, i,
214 ++data->fan_div[i]);
215
216 /* adjust fan_min if active, but not to 0 */
217 if (data->fan_min[i] < 255 &&
218 data->fan_min[i] >= 2)
219 data->fan_min[i] /= 2;
220 }
221 }
222 data->last_updated_measure = jiffies;
223 }
224
225 /* minimum config reading cycle: 300 seconds */
226 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
227 || !data->valid) {
228
229 for (i = 0; i < 6; i++) {
230 data->in_min[i] = i2c_smbus_read_byte_data(client,
231 ADM9240_REG_IN_MIN(i));
232 data->in_max[i] = i2c_smbus_read_byte_data(client,
233 ADM9240_REG_IN_MAX(i));
234 }
235 for (i = 0; i < 2; i++) {
236 data->fan_min[i] = i2c_smbus_read_byte_data(client,
237 ADM9240_REG_FAN_MIN(i));
238 }
239 data->temp_max[0] = i2c_smbus_read_byte_data(client,
240 ADM9240_REG_TEMP_MAX(0));
241 data->temp_max[1] = i2c_smbus_read_byte_data(client,
242 ADM9240_REG_TEMP_MAX(1));
243
244 /* read fan divs and 5-bit VID */
245 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
246 data->fan_div[0] = (i >> 4) & 3;
247 data->fan_div[1] = (i >> 6) & 3;
248 data->vid = i & 0x0f;
249 data->vid |= (i2c_smbus_read_byte_data(client,
250 ADM9240_REG_VID4) & 1) << 4;
251 /* read analog out */
252 data->aout = i2c_smbus_read_byte_data(client,
253 ADM9240_REG_ANALOG_OUT);
254
255 data->last_updated_config = jiffies;
256 data->valid = 1;
257 }
258 mutex_unlock(&data->update_lock);
259 return data;
260}
261
262/*** sysfs accessors ***/
263
264/* temperature */
265static ssize_t temp1_input_show(struct device *dev,
266 struct device_attribute *dummy, char *buf)
267{
268 struct adm9240_data *data = adm9240_update_device(dev);
269 return sprintf(buf, "%d\n", data->temp / 128 * 500); /* 9-bit value */
270}
271
272static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
273 char *buf)
274{
275 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
276 struct adm9240_data *data = adm9240_update_device(dev);
277 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
278}
279
280static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
281 const char *buf, size_t count)
282{
283 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
284 struct adm9240_data *data = dev_get_drvdata(dev);
285 struct i2c_client *client = data->client;
286 long val;
287 int err;
288
289 err = kstrtol(buf, 10, &val);
290 if (err)
291 return err;
292
293 mutex_lock(&data->update_lock);
294 data->temp_max[attr->index] = TEMP_TO_REG(val);
295 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
296 data->temp_max[attr->index]);
297 mutex_unlock(&data->update_lock);
298 return count;
299}
300
301static DEVICE_ATTR_RO(temp1_input);
302static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
303 show_max, set_max, 0);
304static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
305 show_max, set_max, 1);
306
307/* voltage */
308static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
309 char *buf)
310{
311 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
312 struct adm9240_data *data = adm9240_update_device(dev);
313 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
314 attr->index));
315}
316
317static ssize_t show_in_min(struct device *dev,
318 struct device_attribute *devattr, char *buf)
319{
320 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
321 struct adm9240_data *data = adm9240_update_device(dev);
322 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
323 attr->index));
324}
325
326static ssize_t show_in_max(struct device *dev,
327 struct device_attribute *devattr, char *buf)
328{
329 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
330 struct adm9240_data *data = adm9240_update_device(dev);
331 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
332 attr->index));
333}
334
335static ssize_t set_in_min(struct device *dev,
336 struct device_attribute *devattr,
337 const char *buf, size_t count)
338{
339 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
340 struct adm9240_data *data = dev_get_drvdata(dev);
341 struct i2c_client *client = data->client;
342 unsigned long val;
343 int err;
344
345 err = kstrtoul(buf, 10, &val);
346 if (err)
347 return err;
348
349 mutex_lock(&data->update_lock);
350 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
351 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
352 data->in_min[attr->index]);
353 mutex_unlock(&data->update_lock);
354 return count;
355}
356
357static ssize_t set_in_max(struct device *dev,
358 struct device_attribute *devattr,
359 const char *buf, size_t count)
360{
361 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
362 struct adm9240_data *data = dev_get_drvdata(dev);
363 struct i2c_client *client = data->client;
364 unsigned long val;
365 int err;
366
367 err = kstrtoul(buf, 10, &val);
368 if (err)
369 return err;
370
371 mutex_lock(&data->update_lock);
372 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
373 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
374 data->in_max[attr->index]);
375 mutex_unlock(&data->update_lock);
376 return count;
377}
378
379#define vin(nr) \
380static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
381 show_in, NULL, nr); \
382static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
383 show_in_min, set_in_min, nr); \
384static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
385 show_in_max, set_in_max, nr);
386
387vin(0);
388vin(1);
389vin(2);
390vin(3);
391vin(4);
392vin(5);
393
394/* fans */
395static ssize_t show_fan(struct device *dev,
396 struct device_attribute *devattr, char *buf)
397{
398 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
399 struct adm9240_data *data = adm9240_update_device(dev);
400 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
401 1 << data->fan_div[attr->index]));
402}
403
404static ssize_t show_fan_min(struct device *dev,
405 struct device_attribute *devattr, char *buf)
406{
407 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
408 struct adm9240_data *data = adm9240_update_device(dev);
409 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
410 1 << data->fan_div[attr->index]));
411}
412
413static ssize_t show_fan_div(struct device *dev,
414 struct device_attribute *devattr, char *buf)
415{
416 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
417 struct adm9240_data *data = adm9240_update_device(dev);
418 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
419}
420
421/*
422 * set fan speed low limit:
423 *
424 * - value is zero: disable fan speed low limit alarm
425 *
426 * - value is below fan speed measurement range: enable fan speed low
427 * limit alarm to be asserted while fan speed too slow to measure
428 *
429 * - otherwise: select fan clock divider to suit fan speed low limit,
430 * measurement code may adjust registers to ensure fan speed reading
431 */
432static ssize_t set_fan_min(struct device *dev,
433 struct device_attribute *devattr,
434 const char *buf, size_t count)
435{
436 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
437 struct adm9240_data *data = dev_get_drvdata(dev);
438 struct i2c_client *client = data->client;
439 int nr = attr->index;
440 u8 new_div;
441 unsigned long val;
442 int err;
443
444 err = kstrtoul(buf, 10, &val);
445 if (err)
446 return err;
447
448 mutex_lock(&data->update_lock);
449
450 if (!val) {
451 data->fan_min[nr] = 255;
452 new_div = data->fan_div[nr];
453
454 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
455 nr + 1);
456
457 } else if (val < 1350000 / (8 * 254)) {
458 new_div = 3;
459 data->fan_min[nr] = 254;
460
461 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
462 nr + 1, FAN_FROM_REG(254, 1 << new_div));
463
464 } else {
465 unsigned int new_min = 1350000 / val;
466
467 new_div = 0;
468 while (new_min > 192 && new_div < 3) {
469 new_div++;
470 new_min /= 2;
471 }
472 if (!new_min) /* keep > 0 */
473 new_min++;
474
475 data->fan_min[nr] = new_min;
476
477 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
478 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
479 }
480
481 if (new_div != data->fan_div[nr]) {
482 data->fan_div[nr] = new_div;
483 adm9240_write_fan_div(client, nr, new_div);
484 }
485 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
486 data->fan_min[nr]);
487
488 mutex_unlock(&data->update_lock);
489 return count;
490}
491
492#define fan(nr) \
493static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
494 show_fan, NULL, nr - 1); \
495static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
496 show_fan_div, NULL, nr - 1); \
497static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
498 show_fan_min, set_fan_min, nr - 1);
499
500fan(1);
501fan(2);
502
503/* alarms */
504static ssize_t alarms_show(struct device *dev,
505 struct device_attribute *attr, char *buf)
506{
507 struct adm9240_data *data = adm9240_update_device(dev);
508 return sprintf(buf, "%u\n", data->alarms);
509}
510static DEVICE_ATTR_RO(alarms);
511
512static ssize_t show_alarm(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
515 int bitnr = to_sensor_dev_attr(attr)->index;
516 struct adm9240_data *data = adm9240_update_device(dev);
517 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
518}
519static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
520static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
521static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
522static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
523static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
524static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
525static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
526static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
527static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
528
529/* vid */
530static ssize_t cpu0_vid_show(struct device *dev,
531 struct device_attribute *attr, char *buf)
532{
533 struct adm9240_data *data = adm9240_update_device(dev);
534 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
535}
536static DEVICE_ATTR_RO(cpu0_vid);
537
538/* analog output */
539static ssize_t aout_output_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
541{
542 struct adm9240_data *data = adm9240_update_device(dev);
543 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
544}
545
546static ssize_t aout_output_store(struct device *dev,
547 struct device_attribute *attr,
548 const char *buf, size_t count)
549{
550 struct adm9240_data *data = dev_get_drvdata(dev);
551 struct i2c_client *client = data->client;
552 long val;
553 int err;
554
555 err = kstrtol(buf, 10, &val);
556 if (err)
557 return err;
558
559 mutex_lock(&data->update_lock);
560 data->aout = AOUT_TO_REG(val);
561 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
562 mutex_unlock(&data->update_lock);
563 return count;
564}
565static DEVICE_ATTR_RW(aout_output);
566
567static ssize_t chassis_clear(struct device *dev,
568 struct device_attribute *attr,
569 const char *buf, size_t count)
570{
571 struct adm9240_data *data = dev_get_drvdata(dev);
572 struct i2c_client *client = data->client;
573 unsigned long val;
574
575 if (kstrtoul(buf, 10, &val) || val != 0)
576 return -EINVAL;
577
578 mutex_lock(&data->update_lock);
579 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
580 data->valid = 0; /* Force cache refresh */
581 mutex_unlock(&data->update_lock);
582 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
583
584 return count;
585}
586static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
587 chassis_clear, 12);
588
589static struct attribute *adm9240_attrs[] = {
590 &sensor_dev_attr_in0_input.dev_attr.attr,
591 &sensor_dev_attr_in0_min.dev_attr.attr,
592 &sensor_dev_attr_in0_max.dev_attr.attr,
593 &sensor_dev_attr_in0_alarm.dev_attr.attr,
594 &sensor_dev_attr_in1_input.dev_attr.attr,
595 &sensor_dev_attr_in1_min.dev_attr.attr,
596 &sensor_dev_attr_in1_max.dev_attr.attr,
597 &sensor_dev_attr_in1_alarm.dev_attr.attr,
598 &sensor_dev_attr_in2_input.dev_attr.attr,
599 &sensor_dev_attr_in2_min.dev_attr.attr,
600 &sensor_dev_attr_in2_max.dev_attr.attr,
601 &sensor_dev_attr_in2_alarm.dev_attr.attr,
602 &sensor_dev_attr_in3_input.dev_attr.attr,
603 &sensor_dev_attr_in3_min.dev_attr.attr,
604 &sensor_dev_attr_in3_max.dev_attr.attr,
605 &sensor_dev_attr_in3_alarm.dev_attr.attr,
606 &sensor_dev_attr_in4_input.dev_attr.attr,
607 &sensor_dev_attr_in4_min.dev_attr.attr,
608 &sensor_dev_attr_in4_max.dev_attr.attr,
609 &sensor_dev_attr_in4_alarm.dev_attr.attr,
610 &sensor_dev_attr_in5_input.dev_attr.attr,
611 &sensor_dev_attr_in5_min.dev_attr.attr,
612 &sensor_dev_attr_in5_max.dev_attr.attr,
613 &sensor_dev_attr_in5_alarm.dev_attr.attr,
614 &dev_attr_temp1_input.attr,
615 &sensor_dev_attr_temp1_max.dev_attr.attr,
616 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
617 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
618 &sensor_dev_attr_fan1_input.dev_attr.attr,
619 &sensor_dev_attr_fan1_div.dev_attr.attr,
620 &sensor_dev_attr_fan1_min.dev_attr.attr,
621 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
622 &sensor_dev_attr_fan2_input.dev_attr.attr,
623 &sensor_dev_attr_fan2_div.dev_attr.attr,
624 &sensor_dev_attr_fan2_min.dev_attr.attr,
625 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
626 &dev_attr_alarms.attr,
627 &dev_attr_aout_output.attr,
628 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
629 &dev_attr_cpu0_vid.attr,
630 NULL
631};
632
633ATTRIBUTE_GROUPS(adm9240);
634
635
636/*** sensor chip detect and driver install ***/
637
638/* Return 0 if detection is successful, -ENODEV otherwise */
639static int adm9240_detect(struct i2c_client *new_client,
640 struct i2c_board_info *info)
641{
642 struct i2c_adapter *adapter = new_client->adapter;
643 const char *name = "";
644 int address = new_client->addr;
645 u8 man_id, die_rev;
646
647 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
648 return -ENODEV;
649
650 /* verify chip: reg address should match i2c address */
651 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
652 != address) {
653 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
654 address);
655 return -ENODEV;
656 }
657
658 /* check known chip manufacturer */
659 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
660 if (man_id == 0x23) {
661 name = "adm9240";
662 } else if (man_id == 0xda) {
663 name = "ds1780";
664 } else if (man_id == 0x01) {
665 name = "lm81";
666 } else {
667 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
668 man_id);
669 return -ENODEV;
670 }
671
672 /* successful detect, print chip info */
673 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
674 dev_info(&adapter->dev, "found %s revision %u\n",
675 man_id == 0x23 ? "ADM9240" :
676 man_id == 0xda ? "DS1780" : "LM81", die_rev);
677
678 strlcpy(info->type, name, I2C_NAME_SIZE);
679
680 return 0;
681}
682
683static void adm9240_init_client(struct i2c_client *client)
684{
685 struct adm9240_data *data = i2c_get_clientdata(client);
686 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
687 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
688
689 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
690
691 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
692 data->vrm % 10);
693
694 if (conf & 1) { /* measurement cycle running: report state */
695
696 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
697 conf, mode);
698
699 } else { /* cold start: open limits before starting chip */
700 int i;
701
702 for (i = 0; i < 6; i++) {
703 i2c_smbus_write_byte_data(client,
704 ADM9240_REG_IN_MIN(i), 0);
705 i2c_smbus_write_byte_data(client,
706 ADM9240_REG_IN_MAX(i), 255);
707 }
708 i2c_smbus_write_byte_data(client,
709 ADM9240_REG_FAN_MIN(0), 255);
710 i2c_smbus_write_byte_data(client,
711 ADM9240_REG_FAN_MIN(1), 255);
712 i2c_smbus_write_byte_data(client,
713 ADM9240_REG_TEMP_MAX(0), 127);
714 i2c_smbus_write_byte_data(client,
715 ADM9240_REG_TEMP_MAX(1), 127);
716
717 /* start measurement cycle */
718 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
719
720 dev_info(&client->dev,
721 "cold start: config was 0x%02x mode %u\n", conf, mode);
722 }
723}
724
725static int adm9240_probe(struct i2c_client *new_client,
726 const struct i2c_device_id *id)
727{
728 struct device *dev = &new_client->dev;
729 struct device *hwmon_dev;
730 struct adm9240_data *data;
731
732 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
733 if (!data)
734 return -ENOMEM;
735
736 i2c_set_clientdata(new_client, data);
737 data->client = new_client;
738 mutex_init(&data->update_lock);
739
740 adm9240_init_client(new_client);
741
742 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
743 new_client->name,
744 data,
745 adm9240_groups);
746 return PTR_ERR_OR_ZERO(hwmon_dev);
747}
748
749static const struct i2c_device_id adm9240_id[] = {
750 { "adm9240", adm9240 },
751 { "ds1780", ds1780 },
752 { "lm81", lm81 },
753 { }
754};
755MODULE_DEVICE_TABLE(i2c, adm9240_id);
756
757static struct i2c_driver adm9240_driver = {
758 .class = I2C_CLASS_HWMON,
759 .driver = {
760 .name = "adm9240",
761 },
762 .probe = adm9240_probe,
763 .id_table = adm9240_id,
764 .detect = adm9240_detect,
765 .address_list = normal_i2c,
766};
767
768module_i2c_driver(adm9240_driver);
769
770MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
771 "Grant Coady <gcoady.lk@gmail.com> and others");
772MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
773MODULE_LICENSE("GPL");
774