5c68e9c311aa232abce025caaea75e9a7d5f860c
[linux-2.6.git] / drivers / hwmon / adm9240.c
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