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cciss: change the way we notify scsi midlayer of tape drives
[linux-2.6/mini2440.git] / drivers / hwmon / adm9240.c
blob2444b15f2e9d1ec87fcd8958122be6819ae07cca
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 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/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
54 /* Addresses to scan */
55 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
56 I2C_CLIENT_END };
57
58 /* Insmod parameters */
59 I2C_CLIENT_INSMOD_3(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 */
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_probe(struct i2c_client *client,
134 const struct i2c_device_id *id);
135 static int adm9240_detect(struct i2c_client *client, int kind,
136 struct i2c_board_info *info);
137 static void adm9240_init_client(struct i2c_client *client);
138 static int adm9240_remove(struct i2c_client *client);
139 static struct adm9240_data *adm9240_update_device(struct device *dev);
140
141 /* driver data */
142 static const struct i2c_device_id adm9240_id[] = {
143 { "adm9240", adm9240 },
144 { "ds1780", ds1780 },
145 { "lm81", lm81 },
146 { }
147 };
148 MODULE_DEVICE_TABLE(i2c, adm9240_id);
149
150 static struct i2c_driver adm9240_driver = {
151 .class = I2C_CLASS_HWMON,
152 .driver = {
153 .name = "adm9240",
154 },
155 .probe = adm9240_probe,
156 .remove = adm9240_remove,
157 .id_table = adm9240_id,
158 .detect = adm9240_detect,
159 .address_data = &addr_data,
160 };
161
162 /* per client data */
163 struct adm9240_data {
164 struct device *hwmon_dev;
165 struct mutex update_lock;
166 char valid;
167 unsigned long last_updated_measure;
168 unsigned long last_updated_config;
169
170 u8 in[6]; /* ro in0_input */
171 u8 in_max[6]; /* rw in0_max */
172 u8 in_min[6]; /* rw in0_min */
173 u8 fan[2]; /* ro fan1_input */
174 u8 fan_min[2]; /* rw fan1_min */
175 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
176 s16 temp; /* ro temp1_input, 9-bit sign-extended */
177 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
178 u16 alarms; /* ro alarms */
179 u8 aout; /* rw aout_output */
180 u8 vid; /* ro vid */
181 u8 vrm; /* -- vrm set on startup, no accessor */
182 };
183
184 /*** sysfs accessors ***/
185
186 /* temperature */
187 static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
188 char *buf)
189 {
190 struct adm9240_data *data = adm9240_update_device(dev);
191 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
192 }
193
194 static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
195 char *buf)
196 {
197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
198 struct adm9240_data *data = adm9240_update_device(dev);
199 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
200 }
201
202 static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
203 const char *buf, size_t count)
204 {
205 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
206 struct i2c_client *client = to_i2c_client(dev);
207 struct adm9240_data *data = i2c_get_clientdata(client);
208 long val = simple_strtol(buf, NULL, 10);
209
210 mutex_lock(&data->update_lock);
211 data->temp_max[attr->index] = TEMP_TO_REG(val);
212 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
213 data->temp_max[attr->index]);
214 mutex_unlock(&data->update_lock);
215 return count;
216 }
217
218 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
219 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
220 show_max, set_max, 0);
221 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
222 show_max, set_max, 1);
223
224 /* voltage */
225 static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
226 char *buf)
227 {
228 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
229 struct adm9240_data *data = adm9240_update_device(dev);
230 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
231 attr->index));
232 }
233
234 static ssize_t show_in_min(struct device *dev,
235 struct device_attribute *devattr, char *buf)
236 {
237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
238 struct adm9240_data *data = adm9240_update_device(dev);
239 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
240 attr->index));
241 }
242
243 static ssize_t show_in_max(struct device *dev,
244 struct device_attribute *devattr, char *buf)
245 {
246 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
247 struct adm9240_data *data = adm9240_update_device(dev);
248 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
249 attr->index));
250 }
251
252 static ssize_t set_in_min(struct device *dev,
253 struct device_attribute *devattr,
254 const char *buf, size_t count)
255 {
256 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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 mutex_lock(&data->update_lock);
262 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
263 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
264 data->in_min[attr->index]);
265 mutex_unlock(&data->update_lock);
266 return count;
267 }
268
269 static ssize_t set_in_max(struct device *dev,
270 struct device_attribute *devattr,
271 const char *buf, size_t count)
272 {
273 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
274 struct i2c_client *client = to_i2c_client(dev);
275 struct adm9240_data *data = i2c_get_clientdata(client);
276 unsigned long val = simple_strtoul(buf, NULL, 10);
277
278 mutex_lock(&data->update_lock);
279 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
280 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
281 data->in_max[attr->index]);
282 mutex_unlock(&data->update_lock);
283 return count;
284 }
285
286 #define vin(nr) \
287 static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
288 show_in, NULL, nr); \
289 static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
290 show_in_min, set_in_min, nr); \
291 static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
292 show_in_max, set_in_max, nr);
293
294 vin(0);
295 vin(1);
296 vin(2);
297 vin(3);
298 vin(4);
299 vin(5);
300
301 /* fans */
302 static ssize_t show_fan(struct device *dev,
303 struct device_attribute *devattr, char *buf)
304 {
305 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
306 struct adm9240_data *data = adm9240_update_device(dev);
307 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
308 1 << data->fan_div[attr->index]));
309 }
310
311 static ssize_t show_fan_min(struct device *dev,
312 struct device_attribute *devattr, char *buf)
313 {
314 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
315 struct adm9240_data *data = adm9240_update_device(dev);
316 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
317 1 << data->fan_div[attr->index]));
318 }
319
320 static ssize_t show_fan_div(struct device *dev,
321 struct device_attribute *devattr, char *buf)
322 {
323 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
324 struct adm9240_data *data = adm9240_update_device(dev);
325 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
326 }
327
328 /* write new fan div, callers must hold data->update_lock */
329 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
330 u8 fan_div)
331 {
332 u8 reg, old, shift = (nr + 2) * 2;
333
334 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
335 old = (reg >> shift) & 3;
336 reg &= ~(3 << shift);
337 reg |= (fan_div << shift);
338 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
339 dev_dbg(&client->dev, "fan%d clock divider changed from %u "
340 "to %u\n", nr + 1, 1 << old, 1 << fan_div);
341 }
342
343 /*
344 * set fan speed low limit:
345 *
346 * - value is zero: disable fan speed low limit alarm
347 *
348 * - value is below fan speed measurement range: enable fan speed low
349 * limit alarm to be asserted while fan speed too slow to measure
350 *
351 * - otherwise: select fan clock divider to suit fan speed low limit,
352 * measurement code may adjust registers to ensure fan speed reading
353 */
354 static ssize_t set_fan_min(struct device *dev,
355 struct device_attribute *devattr,
356 const char *buf, size_t count)
357 {
358 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
359 struct i2c_client *client = to_i2c_client(dev);
360 struct adm9240_data *data = i2c_get_clientdata(client);
361 unsigned long val = simple_strtoul(buf, NULL, 10);
362 int nr = attr->index;
363 u8 new_div;
364
365 mutex_lock(&data->update_lock);
366
367 if (!val) {
368 data->fan_min[nr] = 255;
369 new_div = data->fan_div[nr];
370
371 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
372 nr + 1);
373
374 } else if (val < 1350000 / (8 * 254)) {
375 new_div = 3;
376 data->fan_min[nr] = 254;
377
378 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
379 nr + 1, FAN_FROM_REG(254, 1 << new_div));
380
381 } else {
382 unsigned int new_min = 1350000 / val;
383
384 new_div = 0;
385 while (new_min > 192 && new_div < 3) {
386 new_div++;
387 new_min /= 2;
388 }
389 if (!new_min) /* keep > 0 */
390 new_min++;
391
392 data->fan_min[nr] = new_min;
393
394 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
395 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
396 }
397
398 if (new_div != data->fan_div[nr]) {
399 data->fan_div[nr] = new_div;
400 adm9240_write_fan_div(client, nr, new_div);
401 }
402 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
403 data->fan_min[nr]);
404
405 mutex_unlock(&data->update_lock);
406 return count;
407 }
408
409 #define fan(nr) \
410 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
411 show_fan, NULL, nr - 1); \
412 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
413 show_fan_div, NULL, nr - 1); \
414 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
415 show_fan_min, set_fan_min, nr - 1);
416
417 fan(1);
418 fan(2);
419
420 /* alarms */
421 static ssize_t show_alarms(struct device *dev,
422 struct device_attribute *attr, char *buf)
423 {
424 struct adm9240_data *data = adm9240_update_device(dev);
425 return sprintf(buf, "%u\n", data->alarms);
426 }
427 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
428
429 static ssize_t show_alarm(struct device *dev,
430 struct device_attribute *attr, char *buf)
431 {
432 int bitnr = to_sensor_dev_attr(attr)->index;
433 struct adm9240_data *data = adm9240_update_device(dev);
434 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
435 }
436 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
437 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
438 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
439 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
440 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
441 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
442 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
443 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
444 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
445
446 /* vid */
447 static ssize_t show_vid(struct device *dev,
448 struct device_attribute *attr, char *buf)
449 {
450 struct adm9240_data *data = adm9240_update_device(dev);
451 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
452 }
453 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
454
455 /* analog output */
456 static ssize_t show_aout(struct device *dev,
457 struct device_attribute *attr, char *buf)
458 {
459 struct adm9240_data *data = adm9240_update_device(dev);
460 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
461 }
462
463 static ssize_t set_aout(struct device *dev,
464 struct device_attribute *attr,
465 const char *buf, size_t count)
466 {
467 struct i2c_client *client = to_i2c_client(dev);
468 struct adm9240_data *data = i2c_get_clientdata(client);
469 unsigned long val = simple_strtol(buf, NULL, 10);
470
471 mutex_lock(&data->update_lock);
472 data->aout = AOUT_TO_REG(val);
473 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
474 mutex_unlock(&data->update_lock);
475 return count;
476 }
477 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
478
479 /* chassis_clear */
480 static ssize_t chassis_clear(struct device *dev,
481 struct device_attribute *attr,
482 const char *buf, size_t count)
483 {
484 struct i2c_client *client = to_i2c_client(dev);
485 unsigned long val = simple_strtol(buf, NULL, 10);
486
487 if (val == 1) {
488 i2c_smbus_write_byte_data(client,
489 ADM9240_REG_CHASSIS_CLEAR, 0x80);
490 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
491 }
492 return count;
493 }
494 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
495
496 static struct attribute *adm9240_attributes[] = {
497 &sensor_dev_attr_in0_input.dev_attr.attr,
498 &sensor_dev_attr_in0_min.dev_attr.attr,
499 &sensor_dev_attr_in0_max.dev_attr.attr,
500 &sensor_dev_attr_in0_alarm.dev_attr.attr,
501 &sensor_dev_attr_in1_input.dev_attr.attr,
502 &sensor_dev_attr_in1_min.dev_attr.attr,
503 &sensor_dev_attr_in1_max.dev_attr.attr,
504 &sensor_dev_attr_in1_alarm.dev_attr.attr,
505 &sensor_dev_attr_in2_input.dev_attr.attr,
506 &sensor_dev_attr_in2_min.dev_attr.attr,
507 &sensor_dev_attr_in2_max.dev_attr.attr,
508 &sensor_dev_attr_in2_alarm.dev_attr.attr,
509 &sensor_dev_attr_in3_input.dev_attr.attr,
510 &sensor_dev_attr_in3_min.dev_attr.attr,
511 &sensor_dev_attr_in3_max.dev_attr.attr,
512 &sensor_dev_attr_in3_alarm.dev_attr.attr,
513 &sensor_dev_attr_in4_input.dev_attr.attr,
514 &sensor_dev_attr_in4_min.dev_attr.attr,
515 &sensor_dev_attr_in4_max.dev_attr.attr,
516 &sensor_dev_attr_in4_alarm.dev_attr.attr,
517 &sensor_dev_attr_in5_input.dev_attr.attr,
518 &sensor_dev_attr_in5_min.dev_attr.attr,
519 &sensor_dev_attr_in5_max.dev_attr.attr,
520 &sensor_dev_attr_in5_alarm.dev_attr.attr,
521 &dev_attr_temp1_input.attr,
522 &sensor_dev_attr_temp1_max.dev_attr.attr,
523 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
524 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
525 &sensor_dev_attr_fan1_input.dev_attr.attr,
526 &sensor_dev_attr_fan1_div.dev_attr.attr,
527 &sensor_dev_attr_fan1_min.dev_attr.attr,
528 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
529 &sensor_dev_attr_fan2_input.dev_attr.attr,
530 &sensor_dev_attr_fan2_div.dev_attr.attr,
531 &sensor_dev_attr_fan2_min.dev_attr.attr,
532 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
533 &dev_attr_alarms.attr,
534 &dev_attr_aout_output.attr,
535 &dev_attr_chassis_clear.attr,
536 &dev_attr_cpu0_vid.attr,
537 NULL
538 };
539
540 static const struct attribute_group adm9240_group = {
541 .attrs = adm9240_attributes,
542 };
543
544
545 /*** sensor chip detect and driver install ***/
546
547 /* Return 0 if detection is successful, -ENODEV otherwise */
548 static int adm9240_detect(struct i2c_client *new_client, int kind,
549 struct i2c_board_info *info)
550 {
551 struct i2c_adapter *adapter = new_client->adapter;
552 const char *name = "";
553 int address = new_client->addr;
554 u8 man_id, die_rev;
555
556 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
557 return -ENODEV;
558
559 if (kind == 0) {
560 kind = adm9240;
561 }
562
563 if (kind < 0) {
564
565 /* verify chip: reg address should match i2c address */
566 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
567 != address) {
568 dev_err(&adapter->dev, "detect fail: address match, "
569 "0x%02x\n", address);
570 return -ENODEV;
571 }
572
573 /* check known chip manufacturer */
574 man_id = i2c_smbus_read_byte_data(new_client,
575 ADM9240_REG_MAN_ID);
576 if (man_id == 0x23) {
577 kind = adm9240;
578 } else if (man_id == 0xda) {
579 kind = ds1780;
580 } else if (man_id == 0x01) {
581 kind = lm81;
582 } else {
583 dev_err(&adapter->dev, "detect fail: unknown manuf, "
584 "0x%02x\n", man_id);
585 return -ENODEV;
586 }
587
588 /* successful detect, print chip info */
589 die_rev = i2c_smbus_read_byte_data(new_client,
590 ADM9240_REG_DIE_REV);
591 dev_info(&adapter->dev, "found %s revision %u\n",
592 man_id == 0x23 ? "ADM9240" :
593 man_id == 0xda ? "DS1780" : "LM81", die_rev);
594 }
595
596 /* either forced or detected chip kind */
597 if (kind == adm9240) {
598 name = "adm9240";
599 } else if (kind == ds1780) {
600 name = "ds1780";
601 } else if (kind == lm81) {
602 name = "lm81";
603 }
604 strlcpy(info->type, name, I2C_NAME_SIZE);
605
606 return 0;
607 }
608
609 static int adm9240_probe(struct i2c_client *new_client,
610 const struct i2c_device_id *id)
611 {
612 struct adm9240_data *data;
613 int err;
614
615 data = kzalloc(sizeof(*data), GFP_KERNEL);
616 if (!data) {
617 err = -ENOMEM;
618 goto exit;
619 }
620
621 i2c_set_clientdata(new_client, data);
622 mutex_init(&data->update_lock);
623
624 adm9240_init_client(new_client);
625
626 /* populate sysfs filesystem */
627 if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group)))
628 goto exit_free;
629
630 data->hwmon_dev = hwmon_device_register(&new_client->dev);
631 if (IS_ERR(data->hwmon_dev)) {
632 err = PTR_ERR(data->hwmon_dev);
633 goto exit_remove;
634 }
635
636 return 0;
637
638 exit_remove:
639 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
640 exit_free:
641 kfree(data);
642 exit:
643 return err;
644 }
645
646 static int adm9240_remove(struct i2c_client *client)
647 {
648 struct adm9240_data *data = i2c_get_clientdata(client);
649
650 hwmon_device_unregister(data->hwmon_dev);
651 sysfs_remove_group(&client->dev.kobj, &adm9240_group);
652
653 kfree(data);
654 return 0;
655 }
656
657 static void adm9240_init_client(struct i2c_client *client)
658 {
659 struct adm9240_data *data = i2c_get_clientdata(client);
660 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
661 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
662
663 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
664
665 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
666 data->vrm % 10);
667
668 if (conf & 1) { /* measurement cycle running: report state */
669
670 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
671 conf, mode);
672
673 } else { /* cold start: open limits before starting chip */
674 int i;
675
676 for (i = 0; i < 6; i++)
677 {
678 i2c_smbus_write_byte_data(client,
679 ADM9240_REG_IN_MIN(i), 0);
680 i2c_smbus_write_byte_data(client,
681 ADM9240_REG_IN_MAX(i), 255);
682 }
683 i2c_smbus_write_byte_data(client,
684 ADM9240_REG_FAN_MIN(0), 255);
685 i2c_smbus_write_byte_data(client,
686 ADM9240_REG_FAN_MIN(1), 255);
687 i2c_smbus_write_byte_data(client,
688 ADM9240_REG_TEMP_MAX(0), 127);
689 i2c_smbus_write_byte_data(client,
690 ADM9240_REG_TEMP_MAX(1), 127);
691
692 /* start measurement cycle */
693 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
694
695 dev_info(&client->dev, "cold start: config was 0x%02x "
696 "mode %u\n", conf, mode);
697 }
698 }
699
700 static struct adm9240_data *adm9240_update_device(struct device *dev)
701 {
702 struct i2c_client *client = to_i2c_client(dev);
703 struct adm9240_data *data = i2c_get_clientdata(client);
704 int i;
705
706 mutex_lock(&data->update_lock);
707
708 /* minimum measurement cycle: 1.75 seconds */
709 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
710 || !data->valid) {
711
712 for (i = 0; i < 6; i++) /* read voltages */
713 {
714 data->in[i] = i2c_smbus_read_byte_data(client,
715 ADM9240_REG_IN(i));
716 }
717 data->alarms = i2c_smbus_read_byte_data(client,
718 ADM9240_REG_INT(0)) |
719 i2c_smbus_read_byte_data(client,
720 ADM9240_REG_INT(1)) << 8;
721
722 /* read temperature: assume temperature changes less than
723 * 0.5'C per two measurement cycles thus ignore possible
724 * but unlikely aliasing error on lsb reading. --Grant */
725 data->temp = ((i2c_smbus_read_byte_data(client,
726 ADM9240_REG_TEMP) << 8) |
727 i2c_smbus_read_byte_data(client,
728 ADM9240_REG_TEMP_CONF)) / 128;
729
730 for (i = 0; i < 2; i++) /* read fans */
731 {
732 data->fan[i] = i2c_smbus_read_byte_data(client,
733 ADM9240_REG_FAN(i));
734
735 /* adjust fan clock divider on overflow */
736 if (data->valid && data->fan[i] == 255 &&
737 data->fan_div[i] < 3) {
738
739 adm9240_write_fan_div(client, i,
740 ++data->fan_div[i]);
741
742 /* adjust fan_min if active, but not to 0 */
743 if (data->fan_min[i] < 255 &&
744 data->fan_min[i] >= 2)
745 data->fan_min[i] /= 2;
746 }
747 }
748 data->last_updated_measure = jiffies;
749 }
750
751 /* minimum config reading cycle: 300 seconds */
752 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
753 || !data->valid) {
754
755 for (i = 0; i < 6; i++)
756 {
757 data->in_min[i] = i2c_smbus_read_byte_data(client,
758 ADM9240_REG_IN_MIN(i));
759 data->in_max[i] = i2c_smbus_read_byte_data(client,
760 ADM9240_REG_IN_MAX(i));
761 }
762 for (i = 0; i < 2; i++)
763 {
764 data->fan_min[i] = i2c_smbus_read_byte_data(client,
765 ADM9240_REG_FAN_MIN(i));
766 }
767 data->temp_max[0] = i2c_smbus_read_byte_data(client,
768 ADM9240_REG_TEMP_MAX(0));
769 data->temp_max[1] = i2c_smbus_read_byte_data(client,
770 ADM9240_REG_TEMP_MAX(1));
771
772 /* read fan divs and 5-bit VID */
773 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
774 data->fan_div[0] = (i >> 4) & 3;
775 data->fan_div[1] = (i >> 6) & 3;
776 data->vid = i & 0x0f;
777 data->vid |= (i2c_smbus_read_byte_data(client,
778 ADM9240_REG_VID4) & 1) << 4;
779 /* read analog out */
780 data->aout = i2c_smbus_read_byte_data(client,
781 ADM9240_REG_ANALOG_OUT);
782
783 data->last_updated_config = jiffies;
784 data->valid = 1;
785 }
786 mutex_unlock(&data->update_lock);
787 return data;
788 }
789
790 static int __init sensors_adm9240_init(void)
791 {
792 return i2c_add_driver(&adm9240_driver);
793 }
794
795 static void __exit sensors_adm9240_exit(void)
796 {
797 i2c_del_driver(&adm9240_driver);
798 }
799
800 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
801 "Grant Coady <gcoady.lk@gmail.com> and others");
802 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
803 MODULE_LICENSE("GPL");
804
805 module_init(sensors_adm9240_init);
806 module_exit(sensors_adm9240_exit);
807
Support for the Chinese Samsung S3C2440 based development boards