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[PATCH] I2C: sysfs names: rename to cpu0_vid, take 3
[net-next-2.6.git] / drivers / i2c / chips / adm9240.c
CommitLineData
40b5cda2
GC		 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 */
52static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
53 I2C_CLIENT_END };
54
55static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
56
57/* Insmod parameters */
58SENSORS_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 */
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 SENSORS_LIMIT(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 SENSORS_LIMIT(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 SENSORS_LIMIT(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
133static int adm9240_attach_adapter(struct i2c_adapter *adapter);
134static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
135static void adm9240_init_client(struct i2c_client *client);
136static int adm9240_detach_client(struct i2c_client *client);
137static struct adm9240_data *adm9240_update_device(struct device *dev);
138
139/* driver data */
140static 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 */
150struct 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 analog_out */
169 u8 vid; /* ro vid */
170 u8 vrm; /* -- vrm set on startup, no accessor */
171};
172
173/* i2c byte read/write interface */
174static int adm9240_read_value(struct i2c_client *client, u8 reg)
175{
176 return i2c_smbus_read_byte_data(client, reg);
177}
178
179static 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) \
188static ssize_t show_##value(struct device *dev, char *buf) \
189{ \
190 struct adm9240_data *data = adm9240_update_device(dev); \
191 return sprintf(buf, "%d\n", data->value * scale); \
192}
193show_temp(temp_high, 1000);
194show_temp(temp_hyst, 1000);
195show_temp(temp, 500);
196
197#define set_temp(value, reg) \
198static ssize_t set_##value(struct device *dev, const char *buf, \
199 size_t count) \
200{ \
201 struct i2c_client *client = to_i2c_client(dev); \
202 struct adm9240_data *data = adm9240_update_device(dev); \
203 long temp = simple_strtoul(buf, NULL, 10); \
204 \
205 down(&data->update_lock); \
206 data->value = TEMP_TO_REG(temp); \
207 adm9240_write_value(client, reg, data->value); \
208 up(&data->update_lock); \
209 return count; \
210}
211
212set_temp(temp_high, ADM9240_REG_TEMP_HIGH);
213set_temp(temp_hyst, ADM9240_REG_TEMP_HYST);
214
215static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
216 show_temp_high, set_temp_high);
217static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
218 show_temp_hyst, set_temp_hyst);
219static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
220
221/* voltage */
222static ssize_t show_in(struct device *dev, char *buf, int nr)
223{
224 struct adm9240_data *data = adm9240_update_device(dev);
225 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
226}
227
228static ssize_t show_in_min(struct device *dev, char *buf, int nr)
229{
230 struct adm9240_data *data = adm9240_update_device(dev);
231 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
232}
233
234static ssize_t show_in_max(struct device *dev, char *buf, int nr)
235{
236 struct adm9240_data *data = adm9240_update_device(dev);
237 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
238}
239
240static ssize_t set_in_min(struct device *dev, const char *buf,
241 size_t count, int nr)
242{
243 struct i2c_client *client = to_i2c_client(dev);
244 struct adm9240_data *data = i2c_get_clientdata(client);
245 unsigned long val = simple_strtoul(buf, NULL, 10);
246
247 down(&data->update_lock);
248 data->in_min[nr] = IN_TO_REG(val, nr);
249 adm9240_write_value(client, ADM9240_REG_IN_MIN(nr), data->in_min[nr]);
250 up(&data->update_lock);
251 return count;
252}
253
254static ssize_t set_in_max(struct device *dev, const char *buf,
255 size_t count, int nr)
256{
257 struct i2c_client *client = to_i2c_client(dev);
258 struct adm9240_data *data = i2c_get_clientdata(client);
259 unsigned long val = simple_strtoul(buf, NULL, 10);
260
261 down(&data->update_lock);
262 data->in_max[nr] = IN_TO_REG(val, nr);
263 adm9240_write_value(client, ADM9240_REG_IN_MAX(nr), data->in_max[nr]);
264 up(&data->update_lock);
265 return count;
266}
267
268#define show_in_offset(offset) \
269static ssize_t show_in##offset(struct device *dev, char *buf) \
270{ \
271 return show_in(dev, buf, offset); \
272} \
273static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); \
274static ssize_t show_in##offset##_min(struct device *dev, char *buf) \
275{ \
276 return show_in_min(dev, buf, offset); \
277} \
278static ssize_t show_in##offset##_max(struct device *dev, char *buf) \
279{ \
280 return show_in_max(dev, buf, offset); \
281} \
282static ssize_t \
283set_in##offset##_min(struct device *dev, const char *buf, size_t count) \
284{ \
285 return set_in_min(dev, buf, count, offset); \
286} \
287static ssize_t \
288set_in##offset##_max(struct device *dev, const char *buf, size_t count) \
289{ \
290 return set_in_max(dev, buf, count, offset); \
291} \
292static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
293 show_in##offset##_min, set_in##offset##_min); \
294static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
295 show_in##offset##_max, set_in##offset##_max);
296
297show_in_offset(0);
298show_in_offset(1);
299show_in_offset(2);
300show_in_offset(3);
301show_in_offset(4);
302show_in_offset(5);
303
304/* fans */
305static ssize_t show_fan(struct device *dev, char *buf, int nr)
306{
307 struct adm9240_data *data = adm9240_update_device(dev);
308 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
309 1 << data->fan_div[nr]));
310}
311
312static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
313{
314 struct adm9240_data *data = adm9240_update_device(dev);
315 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
316 1 << data->fan_div[nr]));
317}
318
319static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
320{
321 struct adm9240_data *data = adm9240_update_device(dev);
322 return sprintf(buf, "%d\n", 1 << data->fan_div[nr]);
323}
324
325/* write new fan div, callers must hold data->update_lock */
326static void adm9240_write_fan_div(struct i2c_client *client, int nr,
327 u8 fan_div)
328{
329 u8 reg, old, shift = (nr + 2) * 2;
330
331 reg = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
332 old = (reg >> shift) & 3;
333 reg &= ~(3 << shift);
334 reg |= (fan_div << shift);
335 adm9240_write_value(client, ADM9240_REG_VID_FAN_DIV, reg);
336 dev_dbg(&client->dev, "fan%d clock divider changed from %u "
337 "to %u\n", nr + 1, 1 << old, 1 << fan_div);
338}
339
340/*
341 * set fan speed low limit:
342 *
343 * - value is zero: disable fan speed low limit alarm
344 *
345 * - value is below fan speed measurement range: enable fan speed low
346 * limit alarm to be asserted while fan speed too slow to measure
347 *
348 * - otherwise: select fan clock divider to suit fan speed low limit,
349 * measurement code may adjust registers to ensure fan speed reading
350 */
351static ssize_t set_fan_min(struct device *dev, const char *buf,
352 size_t count, int nr)
353{
354 struct i2c_client *client = to_i2c_client(dev);
355 struct adm9240_data *data = i2c_get_clientdata(client);
356 unsigned long val = simple_strtoul(buf, NULL, 10);
357 u8 new_div;
358
359 down(&data->update_lock);
360
361 if (!val) {
362 data->fan_min[nr] = 255;
363 new_div = data->fan_div[nr];
364
365 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
366 nr + 1);
367
368 } else if (val < 1350000 / (8 * 254)) {
369 new_div = 3;
370 data->fan_min[nr] = 254;
371
372 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
373 nr + 1, FAN_FROM_REG(254, 1 << new_div));
374
375 } else {
376 unsigned int new_min = 1350000 / val;
377
378 new_div = 0;
379 while (new_min > 192 && new_div < 3) {
380 new_div++;
381 new_min /= 2;
382 }
383 if (!new_min) /* keep > 0 */
384 new_min++;
385
386 data->fan_min[nr] = new_min;
387
388 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
389 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
390 }
391
392 if (new_div != data->fan_div[nr]) {
393 data->fan_div[nr] = new_div;
394 adm9240_write_fan_div(client, nr, new_div);
395 }
396 adm9240_write_value(client, ADM9240_REG_FAN_MIN(nr),
397 data->fan_min[nr]);
398
399 up(&data->update_lock);
400 return count;
401}
402
403#define show_fan_offset(offset) \
404static ssize_t show_fan_##offset (struct device *dev, char *buf) \
405{ \
406return show_fan(dev, buf, offset - 1); \
407} \
408static ssize_t show_fan_##offset##_div (struct device *dev, char *buf) \
409{ \
410return show_fan_div(dev, buf, offset - 1); \
411} \
412static ssize_t show_fan_##offset##_min (struct device *dev, char *buf) \
413{ \
414return show_fan_min(dev, buf, offset - 1); \
415} \
416static ssize_t set_fan_##offset##_min (struct device *dev, \
417const char *buf, size_t count) \
418{ \
419return set_fan_min(dev, buf, count, offset - 1); \
420} \
421static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
422 show_fan_##offset, NULL); \
423static DEVICE_ATTR(fan##offset##_div, S_IRUGO, \
424 show_fan_##offset##_div, NULL); \
425static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
426 show_fan_##offset##_min, set_fan_##offset##_min);
427
428show_fan_offset(1);
429show_fan_offset(2);
430
431/* alarms */
432static ssize_t show_alarms(struct device *dev, char *buf)
433{
434 struct adm9240_data *data = adm9240_update_device(dev);
435 return sprintf(buf, "%u\n", data->alarms);
436}
437static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
438
439/* vid */
440static ssize_t show_vid(struct device *dev, char *buf)
441{
442 struct adm9240_data *data = adm9240_update_device(dev);
443 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
444}
445static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
446
447/* analog output */
448static ssize_t show_aout(struct device *dev, char *buf)
449{
450 struct adm9240_data *data = adm9240_update_device(dev);
451 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
452}
453
454static ssize_t set_aout(struct device *dev, const char *buf, size_t count)
455{
456 struct i2c_client *client = to_i2c_client(dev);
457 struct adm9240_data *data = i2c_get_clientdata(client);
458 unsigned long val = simple_strtol(buf, NULL, 10);
459
460 down(&data->update_lock);
461 data->aout = AOUT_TO_REG(val);
462 adm9240_write_value(client, ADM9240_REG_ANALOG_OUT, data->aout);
463 up(&data->update_lock);
464 return count;
465}
466static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
467
468/* chassis_clear */
469static ssize_t chassis_clear(struct device *dev, const char *buf, size_t count)
470{
471 struct i2c_client *client = to_i2c_client(dev);
472 unsigned long val = simple_strtol(buf, NULL, 10);
473
474 if (val == 1) {
475 adm9240_write_value(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
476 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
477 }
478 return count;
479}
480static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
481
482
483/*** sensor chip detect and driver install ***/
484
485static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
486{
487 struct i2c_client *new_client;
488 struct adm9240_data *data;
489 int err = 0;
490 const char *name = "";
491 u8 man_id, die_rev;
492
493 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
494 goto exit;
495
496 if (!(data = kmalloc(sizeof(struct adm9240_data), GFP_KERNEL))) {
497 err = -ENOMEM;
498 goto exit;
499 }
500 memset(data, 0, sizeof(struct adm9240_data));
501
502 new_client = &data->client;
503 i2c_set_clientdata(new_client, data);
504 new_client->addr = address;
505 new_client->adapter = adapter;
506 new_client->driver = &adm9240_driver;
507 new_client->flags = 0;
508
509 if (kind == 0) {
510 kind = adm9240;
511 }
512
513 if (kind < 0) {
514
515 /* verify chip: reg address should match i2c address */
516 if (adm9240_read_value(new_client, ADM9240_REG_I2C_ADDR)
517 != address) {
518 dev_err(&adapter->dev, "detect fail: address match, "
519 "0x%02x\n", address);
520 goto exit_free;
521 }
522
523 /* check known chip manufacturer */
524 man_id = adm9240_read_value(new_client, ADM9240_REG_MAN_ID);
525
526 if (man_id == 0x23) {
527 kind = adm9240;
528 } else if (man_id == 0xda) {
529 kind = ds1780;
530 } else if (man_id == 0x01) {
531 kind = lm81;
532 } else {
533 dev_err(&adapter->dev, "detect fail: unknown manuf, "
534 "0x%02x\n", man_id);
535 goto exit_free;
536 }
537
538 /* successful detect, print chip info */
539 die_rev = adm9240_read_value(new_client, ADM9240_REG_DIE_REV);
540 dev_info(&adapter->dev, "found %s revision %u\n",
541 man_id == 0x23 ? "ADM9240" :
542 man_id == 0xda ? "DS1780" : "LM81", die_rev);
543 }
544
545 /* either forced or detected chip kind */
546 if (kind == adm9240) {
547 name = "adm9240";
548 } else if (kind == ds1780) {
549 name = "ds1780";
550 } else if (kind == lm81) {
551 name = "lm81";
552 }
553
554 /* fill in the remaining client fields and attach */
555 strlcpy(new_client->name, name, I2C_NAME_SIZE);
556 data->type = kind;
557 init_MUTEX(&data->update_lock);
558
559 if ((err = i2c_attach_client(new_client)))
560 goto exit_free;
561
562 adm9240_init_client(new_client);
563
564 /* populate sysfs filesystem */
565 device_create_file(&new_client->dev, &dev_attr_in0_input);
566 device_create_file(&new_client->dev, &dev_attr_in0_min);
567 device_create_file(&new_client->dev, &dev_attr_in0_max);
568 device_create_file(&new_client->dev, &dev_attr_in1_input);
569 device_create_file(&new_client->dev, &dev_attr_in1_min);
570 device_create_file(&new_client->dev, &dev_attr_in1_max);
571 device_create_file(&new_client->dev, &dev_attr_in2_input);
572 device_create_file(&new_client->dev, &dev_attr_in2_min);
573 device_create_file(&new_client->dev, &dev_attr_in2_max);
574 device_create_file(&new_client->dev, &dev_attr_in3_input);
575 device_create_file(&new_client->dev, &dev_attr_in3_min);
576 device_create_file(&new_client->dev, &dev_attr_in3_max);
577 device_create_file(&new_client->dev, &dev_attr_in4_input);
578 device_create_file(&new_client->dev, &dev_attr_in4_min);
579 device_create_file(&new_client->dev, &dev_attr_in4_max);
580 device_create_file(&new_client->dev, &dev_attr_in5_input);
581 device_create_file(&new_client->dev, &dev_attr_in5_min);
582 device_create_file(&new_client->dev, &dev_attr_in5_max);
583 device_create_file(&new_client->dev, &dev_attr_temp1_max);
584 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
585 device_create_file(&new_client->dev, &dev_attr_temp1_input);
586 device_create_file(&new_client->dev, &dev_attr_fan1_input);
587 device_create_file(&new_client->dev, &dev_attr_fan1_div);
588 device_create_file(&new_client->dev, &dev_attr_fan1_min);
589 device_create_file(&new_client->dev, &dev_attr_fan2_input);
590 device_create_file(&new_client->dev, &dev_attr_fan2_div);
591 device_create_file(&new_client->dev, &dev_attr_fan2_min);
592 device_create_file(&new_client->dev, &dev_attr_alarms);
593 device_create_file(&new_client->dev, &dev_attr_aout_output);
594 device_create_file(&new_client->dev, &dev_attr_chassis_clear);
595 device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
596
597 return 0;
598exit_free:
599 kfree(new_client);
600exit:
601 return err;
602}
603
604static int adm9240_attach_adapter(struct i2c_adapter *adapter)
605{
606 if (!(adapter->class & I2C_CLASS_HWMON))
607 return 0;
608 return i2c_detect(adapter, &addr_data, adm9240_detect);
609}
610
611static int adm9240_detach_client(struct i2c_client *client)
612{
613 int err;
614
615 if ((err = i2c_detach_client(client))) {
616 dev_err(&client->dev, "Client deregistration failed, "
617 "client not detached.\n");
618 return err;
619 }
620
621 kfree(i2c_get_clientdata(client));
622 return 0;
623}
624
625static void adm9240_init_client(struct i2c_client *client)
626{
627 struct adm9240_data *data = i2c_get_clientdata(client);
628 u8 conf = adm9240_read_value(client, ADM9240_REG_CONFIG);
629 u8 mode = adm9240_read_value(client, ADM9240_REG_TEMP_CONF) & 3;
630
631 data->vrm = i2c_which_vrm(); /* need this to report vid as mV */
632
633 if (conf & 1) { /* measurement cycle running: report state */
634
635 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
636 conf, mode);
637
638 } else { /* cold start: open limits before starting chip */
639 int i;
640
641 for (i = 0; i < 6; i++)
642 {
643 adm9240_write_value(client,
644 ADM9240_REG_IN_MIN(i), 0);
645 adm9240_write_value(client,
646 ADM9240_REG_IN_MAX(i), 255);
647 }
648 adm9240_write_value(client, ADM9240_REG_FAN_MIN(0), 255);
649 adm9240_write_value(client, ADM9240_REG_FAN_MIN(1), 255);
650 adm9240_write_value(client, ADM9240_REG_TEMP_HIGH, 127);
651 adm9240_write_value(client, ADM9240_REG_TEMP_HYST, 127);
652
653 /* start measurement cycle */
654 adm9240_write_value(client, ADM9240_REG_CONFIG, 1);
655
656 dev_info(&client->dev, "cold start: config was 0x%02x "
657 "mode %u\n", conf, mode);
658 }
659}
660
661static struct adm9240_data *adm9240_update_device(struct device *dev)
662{
663 struct i2c_client *client = to_i2c_client(dev);
664 struct adm9240_data *data = i2c_get_clientdata(client);
665 int i;
666
667 down(&data->update_lock);
668
669 /* minimum measurement cycle: 1.75 seconds */
670 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
671 || !data->valid) {
672
673 for (i = 0; i < 6; i++) /* read voltages */
674 {
675 data->in[i] = adm9240_read_value(client,
676 ADM9240_REG_IN(i));
677 }
678 data->alarms = adm9240_read_value(client,
679 ADM9240_REG_INT(0)) |
680 adm9240_read_value(client,
681 ADM9240_REG_INT(1)) << 8;
682
683 /* read temperature: assume temperature changes less than
684 * 0.5'C per two measurement cycles thus ignore possible
685 * but unlikely aliasing error on lsb reading. --Grant */
686 data->temp = ((adm9240_read_value(client,
687 ADM9240_REG_TEMP) << 8) |
688 adm9240_read_value(client,
689 ADM9240_REG_TEMP_CONF)) / 128;
690
691 for (i = 0; i < 2; i++) /* read fans */
692 {
693 data->fan[i] = adm9240_read_value(client,
694 ADM9240_REG_FAN(i));
695
696 /* adjust fan clock divider on overflow */
697 if (data->valid && data->fan[i] == 255 &&
698 data->fan_div[i] < 3) {
699
700 adm9240_write_fan_div(client, i,
701 ++data->fan_div[i]);
702
703 /* adjust fan_min if active, but not to 0 */
704 if (data->fan_min[i] < 255 &&
705 data->fan_min[i] >= 2)
706 data->fan_min[i] /= 2;
707 }
708 }
709 data->last_updated_measure = jiffies;
710 }
711
712 /* minimum config reading cycle: 300 seconds */
713 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
714 || !data->valid) {
715
716 for (i = 0; i < 6; i++)
717 {
718 data->in_min[i] = adm9240_read_value(client,
719 ADM9240_REG_IN_MIN(i));
720 data->in_max[i] = adm9240_read_value(client,
721 ADM9240_REG_IN_MAX(i));
722 }
723 for (i = 0; i < 2; i++)
724 {
725 data->fan_min[i] = adm9240_read_value(client,
726 ADM9240_REG_FAN_MIN(i));
727 }
728 data->temp_high = adm9240_read_value(client,
729 ADM9240_REG_TEMP_HIGH);
730 data->temp_hyst = adm9240_read_value(client,
731 ADM9240_REG_TEMP_HYST);
732
733 /* read fan divs and 5-bit VID */
734 i = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
735 data->fan_div[0] = (i >> 4) & 3;
736 data->fan_div[1] = (i >> 6) & 3;
737 data->vid = i & 0x0f;
738 data->vid |= (adm9240_read_value(client,
739 ADM9240_REG_VID4) & 1) << 4;
740 /* read analog out */
741 data->aout = adm9240_read_value(client,
742 ADM9240_REG_ANALOG_OUT);
743
744 data->last_updated_config = jiffies;
745 data->valid = 1;
746 }
747 up(&data->update_lock);
748 return data;
749}
750
751static int __init sensors_adm9240_init(void)
752{
753 return i2c_add_driver(&adm9240_driver);
754}
755
756static void __exit sensors_adm9240_exit(void)
757{
758 i2c_del_driver(&adm9240_driver);
759}
760
761MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
762 "Grant Coady <gcoady@gmail.com> and others");
763MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
764MODULE_LICENSE("GPL");
765
766module_init(sensors_adm9240_init);
767module_exit(sensors_adm9240_exit);
768
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