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[PATCH] I2C: Move hwmon drivers (1/3)
[linux-2.6/kvm.git] / drivers / i2c / chips / adm9240.c
blob5c68e9c311aa232abce025caaea75e9a7d5f860c
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@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 1 > chassis_clear'
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/i2c-sensor.h>
49 #include <linux/i2c-vid.h>
50
51 /* Addresses to scan */
52 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
53 I2C_CLIENT_END };
54
55 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
56
57 /* Insmod parameters */
58 SENSORS_INSMOD_3(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_HIGH 0x39
74 #define ADM9240_REG_TEMP_HYST 0x3a
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 */
83 static 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 */
92 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
93
94 static inline unsigned int IN_FROM_REG(u8 reg, int n)
95 {
96 return SCALE(reg, nom_mv[n], 192);
97 }
98
99 static inline u8 IN_TO_REG(unsigned long val, int n)
100 {
101 return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
102 }
103
104 /* temperature range: -40..125, 127 disables temperature alarm */
105 static inline s8 TEMP_TO_REG(long val)
106 {
107 return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127);
108 }
109
110 /* two fans, each with low fan speed limit */
111 static 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 */
123 static inline u8 AOUT_TO_REG(unsigned long val)
124 {
125 return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255);
126 }
127
128 static inline unsigned int AOUT_FROM_REG(u8 reg)
129 {
130 return SCALE(reg, 1250, 255);
131 }
132
133 static int adm9240_attach_adapter(struct i2c_adapter *adapter);
134 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
135 static void adm9240_init_client(struct i2c_client *client);
136 static int adm9240_detach_client(struct i2c_client *client);
137 static struct adm9240_data *adm9240_update_device(struct device *dev);
138
139 /* driver data */
140 static struct i2c_driver adm9240_driver = {
141 .owner = THIS_MODULE,
142 .name = "adm9240",
143 .id = I2C_DRIVERID_ADM9240,
144 .flags = I2C_DF_NOTIFY,
145 .attach_adapter = adm9240_attach_adapter,
146 .detach_client = adm9240_detach_client,
147 };
148
149 /* per client data */
150 struct adm9240_data {
151 enum chips type;
152 struct i2c_client client;
153 struct semaphore update_lock;
154 char valid;
155 unsigned long last_updated_measure;
156 unsigned long last_updated_config;
157
158 u8 in[6]; /* ro in0_input */
159 u8 in_max[6]; /* rw in0_max */
160 u8 in_min[6]; /* rw in0_min */
161 u8 fan[2]; /* ro fan1_input */
162 u8 fan_min[2]; /* rw fan1_min */
163 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
164 s16 temp; /* ro temp1_input, 9-bit sign-extended */
165 s8 temp_high; /* rw temp1_max */
166 s8 temp_hyst; /* rw temp1_max_hyst */
167 u16 alarms; /* ro alarms */
168 u8 aout; /* rw aout_output */
169 u8 vid; /* ro vid */
170 u8 vrm; /* -- vrm set on startup, no accessor */
171 };
172
173 /* i2c byte read/write interface */
174 static int adm9240_read_value(struct i2c_client *client, u8 reg)
175 {
176 return i2c_smbus_read_byte_data(client, reg);
177 }
178
179 static int adm9240_write_value(struct i2c_client *client, u8 reg, u8 value)
180 {
181 return i2c_smbus_write_byte_data(client, reg, value);
182 }
183
184 /*** sysfs accessors ***/
185
186 /* temperature */
187 #define show_temp(value, scale) \
188 static ssize_t show_##value(struct device *dev, \
189 struct device_attribute *attr, \
190 char *buf) \
191 { \
192 struct adm9240_data *data = adm9240_update_device(dev); \
193 return sprintf(buf, "%d\n", data->value * scale); \
194 }
195 show_temp(temp_high, 1000);
196 show_temp(temp_hyst, 1000);
197 show_temp(temp, 500); /* 0.5'C per bit */
198
199 #define set_temp(value, reg) \
200 static ssize_t set_##value(struct device *dev, \
201 struct device_attribute *attr, \
202 const char *buf, size_t count) \
203 { \
204 struct i2c_client *client = to_i2c_client(dev); \
205 struct adm9240_data *data = adm9240_update_device(dev); \
206 long temp = simple_strtoul(buf, NULL, 10); \
207 \
208 down(&data->update_lock); \
209 data->value = TEMP_TO_REG(temp); \
210 adm9240_write_value(client, reg, data->value); \
211 up(&data->update_lock); \
212 return count; \
213 }
214
215 set_temp(temp_high, ADM9240_REG_TEMP_HIGH);
216 set_temp(temp_hyst, ADM9240_REG_TEMP_HYST);
217
218 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
219 show_temp_high, set_temp_high);
220 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
221 show_temp_hyst, set_temp_hyst);
222 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
223
224 /* voltage */
225 static ssize_t show_in(struct device *dev, char *buf, int nr)
226 {
227 struct adm9240_data *data = adm9240_update_device(dev);
228 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
229 }
230
231 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
232 {
233 struct adm9240_data *data = adm9240_update_device(dev);
234 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
235 }
236
237 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
238 {
239 struct adm9240_data *data = adm9240_update_device(dev);
240 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
241 }
242
243 static ssize_t set_in_min(struct device *dev, const char *buf,
244 size_t count, int nr)
245 {
246 struct i2c_client *client = to_i2c_client(dev);
247 struct adm9240_data *data = i2c_get_clientdata(client);
248 unsigned long val = simple_strtoul(buf, NULL, 10);
249
250 down(&data->update_lock);
251 data->in_min[nr] = IN_TO_REG(val, nr);
252 adm9240_write_value(client, ADM9240_REG_IN_MIN(nr), data->in_min[nr]);
253 up(&data->update_lock);
254 return count;
255 }
256
257 static ssize_t set_in_max(struct device *dev, const char *buf,
258 size_t count, int nr)
259 {
260 struct i2c_client *client = to_i2c_client(dev);
261 struct adm9240_data *data = i2c_get_clientdata(client);
262 unsigned long val = simple_strtoul(buf, NULL, 10);
263
264 down(&data->update_lock);
265 data->in_max[nr] = IN_TO_REG(val, nr);
266 adm9240_write_value(client, ADM9240_REG_IN_MAX(nr), data->in_max[nr]);
267 up(&data->update_lock);
268 return count;
269 }
270
271 #define show_in_offset(offset) \
272 static ssize_t show_in##offset(struct device *dev, \
273 struct device_attribute *attr, \
274 char *buf) \
275 { \
276 return show_in(dev, buf, offset); \
277 } \
278 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); \
279 static ssize_t show_in##offset##_min(struct device *dev, \
280 struct device_attribute *attr, \
281 char *buf) \
282 { \
283 return show_in_min(dev, buf, offset); \
284 } \
285 static ssize_t show_in##offset##_max(struct device *dev, \
286 struct device_attribute *attr, \
287 char *buf) \
288 { \
289 return show_in_max(dev, buf, offset); \
290 } \
291 static ssize_t \
292 set_in##offset##_min(struct device *dev, \
293 struct device_attribute *attr, const char *buf, \
294 size_t count) \
295 { \
296 return set_in_min(dev, buf, count, offset); \
297 } \
298 static ssize_t \
299 set_in##offset##_max(struct device *dev, \
300 struct device_attribute *attr, const char *buf, \
301 size_t count) \
302 { \
303 return set_in_max(dev, buf, count, offset); \
304 } \
305 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
306 show_in##offset##_min, set_in##offset##_min); \
307 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
308 show_in##offset##_max, set_in##offset##_max);
309
310 show_in_offset(0);
311 show_in_offset(1);
312 show_in_offset(2);
313 show_in_offset(3);
314 show_in_offset(4);
315 show_in_offset(5);
316
317 /* fans */
318 static ssize_t show_fan(struct device *dev, char *buf, int nr)
319 {
320 struct adm9240_data *data = adm9240_update_device(dev);
321 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
322 1 << data->fan_div[nr]));
323 }
324
325 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
326 {
327 struct adm9240_data *data = adm9240_update_device(dev);
328 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
329 1 << data->fan_div[nr]));
330 }
331
332 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
333 {
334 struct adm9240_data *data = adm9240_update_device(dev);
335 return sprintf(buf, "%d\n", 1 << data->fan_div[nr]);
336 }
337
338 /* write new fan div, callers must hold data->update_lock */
339 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
340 u8 fan_div)
341 {
342 u8 reg, old, shift = (nr + 2) * 2;
343
344 reg = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
345 old = (reg >> shift) & 3;
346 reg &= ~(3 << shift);
347 reg |= (fan_div << shift);
348 adm9240_write_value(client, ADM9240_REG_VID_FAN_DIV, reg);
349 dev_dbg(&client->dev, "fan%d clock divider changed from %u "
350 "to %u\n", nr + 1, 1 << old, 1 << fan_div);
351 }
352
353 /*
354 * set fan speed low limit:
355 *
356 * - value is zero: disable fan speed low limit alarm
357 *
358 * - value is below fan speed measurement range: enable fan speed low
359 * limit alarm to be asserted while fan speed too slow to measure
360 *
361 * - otherwise: select fan clock divider to suit fan speed low limit,
362 * measurement code may adjust registers to ensure fan speed reading
363 */
364 static ssize_t set_fan_min(struct device *dev, const char *buf,
365 size_t count, int nr)
366 {
367 struct i2c_client *client = to_i2c_client(dev);
368 struct adm9240_data *data = i2c_get_clientdata(client);
369 unsigned long val = simple_strtoul(buf, NULL, 10);
370 u8 new_div;
371
372 down(&data->update_lock);
373
374 if (!val) {
375 data->fan_min[nr] = 255;
376 new_div = data->fan_div[nr];
377
378 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
379 nr + 1);
380
381 } else if (val < 1350000 / (8 * 254)) {
382 new_div = 3;
383 data->fan_min[nr] = 254;
384
385 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
386 nr + 1, FAN_FROM_REG(254, 1 << new_div));
387
388 } else {
389 unsigned int new_min = 1350000 / val;
390
391 new_div = 0;
392 while (new_min > 192 && new_div < 3) {
393 new_div++;
394 new_min /= 2;
395 }
396 if (!new_min) /* keep > 0 */
397 new_min++;
398
399 data->fan_min[nr] = new_min;
400
401 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
402 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
403 }
404
405 if (new_div != data->fan_div[nr]) {
406 data->fan_div[nr] = new_div;
407 adm9240_write_fan_div(client, nr, new_div);
408 }
409 adm9240_write_value(client, ADM9240_REG_FAN_MIN(nr),
410 data->fan_min[nr]);
411
412 up(&data->update_lock);
413 return count;
414 }
415
416 #define show_fan_offset(offset) \
417 static ssize_t show_fan_##offset (struct device *dev, \
418 struct device_attribute *attr, \
419 char *buf) \
420 { \
421 return show_fan(dev, buf, offset - 1); \
422 } \
423 static ssize_t show_fan_##offset##_div (struct device *dev, \
424 struct device_attribute *attr, \
425 char *buf) \
426 { \
427 return show_fan_div(dev, buf, offset - 1); \
428 } \
429 static ssize_t show_fan_##offset##_min (struct device *dev, \
430 struct device_attribute *attr, \
431 char *buf) \
432 { \
433 return show_fan_min(dev, buf, offset - 1); \
434 } \
435 static ssize_t set_fan_##offset##_min (struct device *dev, \
436 struct device_attribute *attr, \
437 const char *buf, size_t count) \
438 { \
439 return set_fan_min(dev, buf, count, offset - 1); \
440 } \
441 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
442 show_fan_##offset, NULL); \
443 static DEVICE_ATTR(fan##offset##_div, S_IRUGO, \
444 show_fan_##offset##_div, NULL); \
445 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
446 show_fan_##offset##_min, set_fan_##offset##_min);
447
448 show_fan_offset(1);
449 show_fan_offset(2);
450
451 /* alarms */
452 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
453 {
454 struct adm9240_data *data = adm9240_update_device(dev);
455 return sprintf(buf, "%u\n", data->alarms);
456 }
457 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
458
459 /* vid */
460 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
461 {
462 struct adm9240_data *data = adm9240_update_device(dev);
463 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
464 }
465 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
466
467 /* analog output */
468 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
469 {
470 struct adm9240_data *data = adm9240_update_device(dev);
471 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
472 }
473
474 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
475 {
476 struct i2c_client *client = to_i2c_client(dev);
477 struct adm9240_data *data = i2c_get_clientdata(client);
478 unsigned long val = simple_strtol(buf, NULL, 10);
479
480 down(&data->update_lock);
481 data->aout = AOUT_TO_REG(val);
482 adm9240_write_value(client, ADM9240_REG_ANALOG_OUT, data->aout);
483 up(&data->update_lock);
484 return count;
485 }
486 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
487
488 /* chassis_clear */
489 static ssize_t chassis_clear(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
490 {
491 struct i2c_client *client = to_i2c_client(dev);
492 unsigned long val = simple_strtol(buf, NULL, 10);
493
494 if (val == 1) {
495 adm9240_write_value(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
496 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
497 }
498 return count;
499 }
500 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
501
502
503 /*** sensor chip detect and driver install ***/
504
505 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
506 {
507 struct i2c_client *new_client;
508 struct adm9240_data *data;
509 int err = 0;
510 const char *name = "";
511 u8 man_id, die_rev;
512
513 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
514 goto exit;
515
516 if (!(data = kmalloc(sizeof(struct adm9240_data), GFP_KERNEL))) {
517 err = -ENOMEM;
518 goto exit;
519 }
520 memset(data, 0, sizeof(struct adm9240_data));
521
522 new_client = &data->client;
523 i2c_set_clientdata(new_client, data);
524 new_client->addr = address;
525 new_client->adapter = adapter;
526 new_client->driver = &adm9240_driver;
527 new_client->flags = 0;
528
529 if (kind == 0) {
530 kind = adm9240;
531 }
532
533 if (kind < 0) {
534
535 /* verify chip: reg address should match i2c address */
536 if (adm9240_read_value(new_client, ADM9240_REG_I2C_ADDR)
537 != address) {
538 dev_err(&adapter->dev, "detect fail: address match, "
539 "0x%02x\n", address);
540 goto exit_free;
541 }
542
543 /* check known chip manufacturer */
544 man_id = adm9240_read_value(new_client, ADM9240_REG_MAN_ID);
545
546 if (man_id == 0x23) {
547 kind = adm9240;
548 } else if (man_id == 0xda) {
549 kind = ds1780;
550 } else if (man_id == 0x01) {
551 kind = lm81;
552 } else {
553 dev_err(&adapter->dev, "detect fail: unknown manuf, "
554 "0x%02x\n", man_id);
555 goto exit_free;
556 }
557
558 /* successful detect, print chip info */
559 die_rev = adm9240_read_value(new_client, ADM9240_REG_DIE_REV);
560 dev_info(&adapter->dev, "found %s revision %u\n",
561 man_id == 0x23 ? "ADM9240" :
562 man_id == 0xda ? "DS1780" : "LM81", die_rev);
563 }
564
565 /* either forced or detected chip kind */
566 if (kind == adm9240) {
567 name = "adm9240";
568 } else if (kind == ds1780) {
569 name = "ds1780";
570 } else if (kind == lm81) {
571 name = "lm81";
572 }
573
574 /* fill in the remaining client fields and attach */
575 strlcpy(new_client->name, name, I2C_NAME_SIZE);
576 data->type = kind;
577 init_MUTEX(&data->update_lock);
578
579 if ((err = i2c_attach_client(new_client)))
580 goto exit_free;
581
582 adm9240_init_client(new_client);
583
584 /* populate sysfs filesystem */
585 device_create_file(&new_client->dev, &dev_attr_in0_input);
586 device_create_file(&new_client->dev, &dev_attr_in0_min);
587 device_create_file(&new_client->dev, &dev_attr_in0_max);
588 device_create_file(&new_client->dev, &dev_attr_in1_input);
589 device_create_file(&new_client->dev, &dev_attr_in1_min);
590 device_create_file(&new_client->dev, &dev_attr_in1_max);
591 device_create_file(&new_client->dev, &dev_attr_in2_input);
592 device_create_file(&new_client->dev, &dev_attr_in2_min);
593 device_create_file(&new_client->dev, &dev_attr_in2_max);
594 device_create_file(&new_client->dev, &dev_attr_in3_input);
595 device_create_file(&new_client->dev, &dev_attr_in3_min);
596 device_create_file(&new_client->dev, &dev_attr_in3_max);
597 device_create_file(&new_client->dev, &dev_attr_in4_input);
598 device_create_file(&new_client->dev, &dev_attr_in4_min);
599 device_create_file(&new_client->dev, &dev_attr_in4_max);
600 device_create_file(&new_client->dev, &dev_attr_in5_input);
601 device_create_file(&new_client->dev, &dev_attr_in5_min);
602 device_create_file(&new_client->dev, &dev_attr_in5_max);
603 device_create_file(&new_client->dev, &dev_attr_temp1_max);
604 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
605 device_create_file(&new_client->dev, &dev_attr_temp1_input);
606 device_create_file(&new_client->dev, &dev_attr_fan1_input);
607 device_create_file(&new_client->dev, &dev_attr_fan1_div);
608 device_create_file(&new_client->dev, &dev_attr_fan1_min);
609 device_create_file(&new_client->dev, &dev_attr_fan2_input);
610 device_create_file(&new_client->dev, &dev_attr_fan2_div);
611 device_create_file(&new_client->dev, &dev_attr_fan2_min);
612 device_create_file(&new_client->dev, &dev_attr_alarms);
613 device_create_file(&new_client->dev, &dev_attr_aout_output);
614 device_create_file(&new_client->dev, &dev_attr_chassis_clear);
615 device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
616
617 return 0;
618 exit_free:
619 kfree(new_client);
620 exit:
621 return err;
622 }
623
624 static int adm9240_attach_adapter(struct i2c_adapter *adapter)
625 {
626 if (!(adapter->class & I2C_CLASS_HWMON))
627 return 0;
628 return i2c_detect(adapter, &addr_data, adm9240_detect);
629 }
630
631 static int adm9240_detach_client(struct i2c_client *client)
632 {
633 int err;
634
635 if ((err = i2c_detach_client(client))) {
636 dev_err(&client->dev, "Client deregistration failed, "
637 "client not detached.\n");
638 return err;
639 }
640
641 kfree(i2c_get_clientdata(client));
642 return 0;
643 }
644
645 static void adm9240_init_client(struct i2c_client *client)
646 {
647 struct adm9240_data *data = i2c_get_clientdata(client);
648 u8 conf = adm9240_read_value(client, ADM9240_REG_CONFIG);
649 u8 mode = adm9240_read_value(client, ADM9240_REG_TEMP_CONF) & 3;
650
651 data->vrm = i2c_which_vrm(); /* need this to report vid as mV */
652
653 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
654 data->vrm % 10);
655
656 if (conf & 1) { /* measurement cycle running: report state */
657
658 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
659 conf, mode);
660
661 } else { /* cold start: open limits before starting chip */
662 int i;
663
664 for (i = 0; i < 6; i++)
665 {
666 adm9240_write_value(client,
667 ADM9240_REG_IN_MIN(i), 0);
668 adm9240_write_value(client,
669 ADM9240_REG_IN_MAX(i), 255);
670 }
671 adm9240_write_value(client, ADM9240_REG_FAN_MIN(0), 255);
672 adm9240_write_value(client, ADM9240_REG_FAN_MIN(1), 255);
673 adm9240_write_value(client, ADM9240_REG_TEMP_HIGH, 127);
674 adm9240_write_value(client, ADM9240_REG_TEMP_HYST, 127);
675
676 /* start measurement cycle */
677 adm9240_write_value(client, ADM9240_REG_CONFIG, 1);
678
679 dev_info(&client->dev, "cold start: config was 0x%02x "
680 "mode %u\n", conf, mode);
681 }
682 }
683
684 static struct adm9240_data *adm9240_update_device(struct device *dev)
685 {
686 struct i2c_client *client = to_i2c_client(dev);
687 struct adm9240_data *data = i2c_get_clientdata(client);
688 int i;
689
690 down(&data->update_lock);
691
692 /* minimum measurement cycle: 1.75 seconds */
693 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
694 || !data->valid) {
695
696 for (i = 0; i < 6; i++) /* read voltages */
697 {
698 data->in[i] = adm9240_read_value(client,
699 ADM9240_REG_IN(i));
700 }
701 data->alarms = adm9240_read_value(client,
702 ADM9240_REG_INT(0)) |
703 adm9240_read_value(client,
704 ADM9240_REG_INT(1)) << 8;
705
706 /* read temperature: assume temperature changes less than
707 * 0.5'C per two measurement cycles thus ignore possible
708 * but unlikely aliasing error on lsb reading. --Grant */
709 data->temp = ((adm9240_read_value(client,
710 ADM9240_REG_TEMP) << 8) |
711 adm9240_read_value(client,
712 ADM9240_REG_TEMP_CONF)) / 128;
713
714 for (i = 0; i < 2; i++) /* read fans */
715 {
716 data->fan[i] = adm9240_read_value(client,
717 ADM9240_REG_FAN(i));
718
719 /* adjust fan clock divider on overflow */
720 if (data->valid && data->fan[i] == 255 &&
721 data->fan_div[i] < 3) {
722
723 adm9240_write_fan_div(client, i,
724 ++data->fan_div[i]);
725
726 /* adjust fan_min if active, but not to 0 */
727 if (data->fan_min[i] < 255 &&
728 data->fan_min[i] >= 2)
729 data->fan_min[i] /= 2;
730 }
731 }
732 data->last_updated_measure = jiffies;
733 }
734
735 /* minimum config reading cycle: 300 seconds */
736 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
737 || !data->valid) {
738
739 for (i = 0; i < 6; i++)
740 {
741 data->in_min[i] = adm9240_read_value(client,
742 ADM9240_REG_IN_MIN(i));
743 data->in_max[i] = adm9240_read_value(client,
744 ADM9240_REG_IN_MAX(i));
745 }
746 for (i = 0; i < 2; i++)
747 {
748 data->fan_min[i] = adm9240_read_value(client,
749 ADM9240_REG_FAN_MIN(i));
750 }
751 data->temp_high = adm9240_read_value(client,
752 ADM9240_REG_TEMP_HIGH);
753 data->temp_hyst = adm9240_read_value(client,
754 ADM9240_REG_TEMP_HYST);
755
756 /* read fan divs and 5-bit VID */
757 i = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
758 data->fan_div[0] = (i >> 4) & 3;
759 data->fan_div[1] = (i >> 6) & 3;
760 data->vid = i & 0x0f;
761 data->vid |= (adm9240_read_value(client,
762 ADM9240_REG_VID4) & 1) << 4;
763 /* read analog out */
764 data->aout = adm9240_read_value(client,
765 ADM9240_REG_ANALOG_OUT);
766
767 data->last_updated_config = jiffies;
768 data->valid = 1;
769 }
770 up(&data->update_lock);
771 return data;
772 }
773
774 static int __init sensors_adm9240_init(void)
775 {
776 return i2c_add_driver(&adm9240_driver);
777 }
778
779 static void __exit sensors_adm9240_exit(void)
780 {
781 i2c_del_driver(&adm9240_driver);
782 }
783
784 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
785 "Grant Coady <gcoady@gmail.com> and others");
786 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
787 MODULE_LICENSE("GPL");
788
789 module_init(sensors_adm9240_init);
790 module_exit(sensors_adm9240_exit);
791
kernel-based virtual machine