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Merge branch 'for-jens' of http://git.drbd.org/linux-2.6-drbd into for-linus
[linux-2.6/next.git] / drivers / hwmon / lm78.c
blobcadcbd90ff3bc4f0c89db6cdd9c9da82becc46f1
1 /*
2 lm78.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
5 Copyright (c) 2007 Jean Delvare <khali@linux-fr.org>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/i2c.h>
27 #include <linux/platform_device.h>
28 #include <linux/ioport.h>
29 #include <linux/hwmon.h>
30 #include <linux/hwmon-vid.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34 #include <linux/io.h>
35
36 /* ISA device, if found */
37 static struct platform_device *pdev;
38
39 /* Addresses to scan */
40 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
41 0x2e, 0x2f, I2C_CLIENT_END };
42 static unsigned short isa_address = 0x290;
43
44 enum chips { lm78, lm79 };
45
46 /* Many LM78 constants specified below */
47
48 /* Length of ISA address segment */
49 #define LM78_EXTENT 8
50
51 /* Where are the ISA address/data registers relative to the base address */
52 #define LM78_ADDR_REG_OFFSET 5
53 #define LM78_DATA_REG_OFFSET 6
54
55 /* The LM78 registers */
56 #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
57 #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
58 #define LM78_REG_IN(nr) (0x20 + (nr))
59
60 #define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
61 #define LM78_REG_FAN(nr) (0x28 + (nr))
62
63 #define LM78_REG_TEMP 0x27
64 #define LM78_REG_TEMP_OVER 0x39
65 #define LM78_REG_TEMP_HYST 0x3a
66
67 #define LM78_REG_ALARM1 0x41
68 #define LM78_REG_ALARM2 0x42
69
70 #define LM78_REG_VID_FANDIV 0x47
71
72 #define LM78_REG_CONFIG 0x40
73 #define LM78_REG_CHIPID 0x49
74 #define LM78_REG_I2C_ADDR 0x48
75
76
77 /* Conversions. Rounding and limit checking is only done on the TO_REG
78 variants. */
79
80 /* IN: mV, (0V to 4.08V)
81 REG: 16mV/bit */
82 static inline u8 IN_TO_REG(unsigned long val)
83 {
84 unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
85 return (nval + 8) / 16;
86 }
87 #define IN_FROM_REG(val) ((val) * 16)
88
89 static inline u8 FAN_TO_REG(long rpm, int div)
90 {
91 if (rpm <= 0)
92 return 255;
93 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
94 }
95
96 static inline int FAN_FROM_REG(u8 val, int div)
97 {
98 return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
99 }
100
101 /* TEMP: mC (-128C to +127C)
102 REG: 1C/bit, two's complement */
103 static inline s8 TEMP_TO_REG(int val)
104 {
105 int nval = SENSORS_LIMIT(val, -128000, 127000) ;
106 return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
107 }
108
109 static inline int TEMP_FROM_REG(s8 val)
110 {
111 return val * 1000;
112 }
113
114 #define DIV_FROM_REG(val) (1 << (val))
115
116 struct lm78_data {
117 struct i2c_client *client;
118 struct device *hwmon_dev;
119 struct mutex lock;
120 enum chips type;
121
122 /* For ISA device only */
123 const char *name;
124 int isa_addr;
125
126 struct mutex update_lock;
127 char valid; /* !=0 if following fields are valid */
128 unsigned long last_updated; /* In jiffies */
129
130 u8 in[7]; /* Register value */
131 u8 in_max[7]; /* Register value */
132 u8 in_min[7]; /* Register value */
133 u8 fan[3]; /* Register value */
134 u8 fan_min[3]; /* Register value */
135 s8 temp; /* Register value */
136 s8 temp_over; /* Register value */
137 s8 temp_hyst; /* Register value */
138 u8 fan_div[3]; /* Register encoding, shifted right */
139 u8 vid; /* Register encoding, combined */
140 u16 alarms; /* Register encoding, combined */
141 };
142
143
144 static int lm78_i2c_detect(struct i2c_client *client,
145 struct i2c_board_info *info);
146 static int lm78_i2c_probe(struct i2c_client *client,
147 const struct i2c_device_id *id);
148 static int lm78_i2c_remove(struct i2c_client *client);
149
150 static int __devinit lm78_isa_probe(struct platform_device *pdev);
151 static int __devexit lm78_isa_remove(struct platform_device *pdev);
152
153 static int lm78_read_value(struct lm78_data *data, u8 reg);
154 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
155 static struct lm78_data *lm78_update_device(struct device *dev);
156 static void lm78_init_device(struct lm78_data *data);
157
158
159 static const struct i2c_device_id lm78_i2c_id[] = {
160 { "lm78", lm78 },
161 { "lm79", lm79 },
162 { }
163 };
164 MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
165
166 static struct i2c_driver lm78_driver = {
167 .class = I2C_CLASS_HWMON,
168 .driver = {
169 .name = "lm78",
170 },
171 .probe = lm78_i2c_probe,
172 .remove = lm78_i2c_remove,
173 .id_table = lm78_i2c_id,
174 .detect = lm78_i2c_detect,
175 .address_list = normal_i2c,
176 };
177
178 static struct platform_driver lm78_isa_driver = {
179 .driver = {
180 .owner = THIS_MODULE,
181 .name = "lm78",
182 },
183 .probe = lm78_isa_probe,
184 .remove = __devexit_p(lm78_isa_remove),
185 };
186
187
188 /* 7 Voltages */
189 static ssize_t show_in(struct device *dev, struct device_attribute *da,
190 char *buf)
191 {
192 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
193 struct lm78_data *data = lm78_update_device(dev);
194 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
195 }
196
197 static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
198 char *buf)
199 {
200 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
201 struct lm78_data *data = lm78_update_device(dev);
202 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
203 }
204
205 static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
206 char *buf)
207 {
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
209 struct lm78_data *data = lm78_update_device(dev);
210 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
211 }
212
213 static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
214 const char *buf, size_t count)
215 {
216 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
217 struct lm78_data *data = dev_get_drvdata(dev);
218 unsigned long val = simple_strtoul(buf, NULL, 10);
219 int nr = attr->index;
220
221 mutex_lock(&data->update_lock);
222 data->in_min[nr] = IN_TO_REG(val);
223 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
224 mutex_unlock(&data->update_lock);
225 return count;
226 }
227
228 static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
229 const char *buf, size_t count)
230 {
231 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
232 struct lm78_data *data = dev_get_drvdata(dev);
233 unsigned long val = simple_strtoul(buf, NULL, 10);
234 int nr = attr->index;
235
236 mutex_lock(&data->update_lock);
237 data->in_max[nr] = IN_TO_REG(val);
238 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
239 mutex_unlock(&data->update_lock);
240 return count;
241 }
242
243 #define show_in_offset(offset) \
244 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
245 show_in, NULL, offset); \
246 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
247 show_in_min, set_in_min, offset); \
248 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
249 show_in_max, set_in_max, offset);
250
251 show_in_offset(0);
252 show_in_offset(1);
253 show_in_offset(2);
254 show_in_offset(3);
255 show_in_offset(4);
256 show_in_offset(5);
257 show_in_offset(6);
258
259 /* Temperature */
260 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
261 char *buf)
262 {
263 struct lm78_data *data = lm78_update_device(dev);
264 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
265 }
266
267 static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
268 char *buf)
269 {
270 struct lm78_data *data = lm78_update_device(dev);
271 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
272 }
273
274 static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
275 const char *buf, size_t count)
276 {
277 struct lm78_data *data = dev_get_drvdata(dev);
278 long val = simple_strtol(buf, NULL, 10);
279
280 mutex_lock(&data->update_lock);
281 data->temp_over = TEMP_TO_REG(val);
282 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
283 mutex_unlock(&data->update_lock);
284 return count;
285 }
286
287 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
288 char *buf)
289 {
290 struct lm78_data *data = lm78_update_device(dev);
291 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
292 }
293
294 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
295 const char *buf, size_t count)
296 {
297 struct lm78_data *data = dev_get_drvdata(dev);
298 long val = simple_strtol(buf, NULL, 10);
299
300 mutex_lock(&data->update_lock);
301 data->temp_hyst = TEMP_TO_REG(val);
302 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
303 mutex_unlock(&data->update_lock);
304 return count;
305 }
306
307 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
308 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
309 show_temp_over, set_temp_over);
310 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
311 show_temp_hyst, set_temp_hyst);
312
313 /* 3 Fans */
314 static ssize_t show_fan(struct device *dev, struct device_attribute *da,
315 char *buf)
316 {
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
318 struct lm78_data *data = lm78_update_device(dev);
319 int nr = attr->index;
320 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
321 DIV_FROM_REG(data->fan_div[nr])) );
322 }
323
324 static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
325 char *buf)
326 {
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
328 struct lm78_data *data = lm78_update_device(dev);
329 int nr = attr->index;
330 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr],
331 DIV_FROM_REG(data->fan_div[nr])) );
332 }
333
334 static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
335 const char *buf, size_t count)
336 {
337 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
338 struct lm78_data *data = dev_get_drvdata(dev);
339 int nr = attr->index;
340 unsigned long val = simple_strtoul(buf, NULL, 10);
341
342 mutex_lock(&data->update_lock);
343 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
344 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
345 mutex_unlock(&data->update_lock);
346 return count;
347 }
348
349 static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
350 char *buf)
351 {
352 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
353 struct lm78_data *data = lm78_update_device(dev);
354 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
355 }
356
357 /* Note: we save and restore the fan minimum here, because its value is
358 determined in part by the fan divisor. This follows the principle of
359 least surprise; the user doesn't expect the fan minimum to change just
360 because the divisor changed. */
361 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
362 const char *buf, size_t count)
363 {
364 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
365 struct lm78_data *data = dev_get_drvdata(dev);
366 int nr = attr->index;
367 unsigned long val = simple_strtoul(buf, NULL, 10);
368 unsigned long min;
369 u8 reg;
370
371 mutex_lock(&data->update_lock);
372 min = FAN_FROM_REG(data->fan_min[nr],
373 DIV_FROM_REG(data->fan_div[nr]));
374
375 switch (val) {
376 case 1: data->fan_div[nr] = 0; break;
377 case 2: data->fan_div[nr] = 1; break;
378 case 4: data->fan_div[nr] = 2; break;
379 case 8: data->fan_div[nr] = 3; break;
380 default:
381 dev_err(dev, "fan_div value %ld not "
382 "supported. Choose one of 1, 2, 4 or 8!\n", val);
383 mutex_unlock(&data->update_lock);
384 return -EINVAL;
385 }
386
387 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
388 switch (nr) {
389 case 0:
390 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
391 break;
392 case 1:
393 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
394 break;
395 }
396 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
397
398 data->fan_min[nr] =
399 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
400 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
401 mutex_unlock(&data->update_lock);
402
403 return count;
404 }
405
406 #define show_fan_offset(offset) \
407 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
408 show_fan, NULL, offset - 1); \
409 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
410 show_fan_min, set_fan_min, offset - 1);
411
412 show_fan_offset(1);
413 show_fan_offset(2);
414 show_fan_offset(3);
415
416 /* Fan 3 divisor is locked in H/W */
417 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
418 show_fan_div, set_fan_div, 0);
419 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
420 show_fan_div, set_fan_div, 1);
421 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
422
423 /* VID */
424 static ssize_t show_vid(struct device *dev, struct device_attribute *da,
425 char *buf)
426 {
427 struct lm78_data *data = lm78_update_device(dev);
428 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
429 }
430 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
431
432 /* Alarms */
433 static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
434 char *buf)
435 {
436 struct lm78_data *data = lm78_update_device(dev);
437 return sprintf(buf, "%u\n", data->alarms);
438 }
439 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
440
441 static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
442 char *buf)
443 {
444 struct lm78_data *data = lm78_update_device(dev);
445 int nr = to_sensor_dev_attr(da)->index;
446 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
447 }
448 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
449 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
450 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
451 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
452 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
453 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
454 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
455 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
456 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
457 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
458 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
459
460 static struct attribute *lm78_attributes[] = {
461 &sensor_dev_attr_in0_input.dev_attr.attr,
462 &sensor_dev_attr_in0_min.dev_attr.attr,
463 &sensor_dev_attr_in0_max.dev_attr.attr,
464 &sensor_dev_attr_in0_alarm.dev_attr.attr,
465 &sensor_dev_attr_in1_input.dev_attr.attr,
466 &sensor_dev_attr_in1_min.dev_attr.attr,
467 &sensor_dev_attr_in1_max.dev_attr.attr,
468 &sensor_dev_attr_in1_alarm.dev_attr.attr,
469 &sensor_dev_attr_in2_input.dev_attr.attr,
470 &sensor_dev_attr_in2_min.dev_attr.attr,
471 &sensor_dev_attr_in2_max.dev_attr.attr,
472 &sensor_dev_attr_in2_alarm.dev_attr.attr,
473 &sensor_dev_attr_in3_input.dev_attr.attr,
474 &sensor_dev_attr_in3_min.dev_attr.attr,
475 &sensor_dev_attr_in3_max.dev_attr.attr,
476 &sensor_dev_attr_in3_alarm.dev_attr.attr,
477 &sensor_dev_attr_in4_input.dev_attr.attr,
478 &sensor_dev_attr_in4_min.dev_attr.attr,
479 &sensor_dev_attr_in4_max.dev_attr.attr,
480 &sensor_dev_attr_in4_alarm.dev_attr.attr,
481 &sensor_dev_attr_in5_input.dev_attr.attr,
482 &sensor_dev_attr_in5_min.dev_attr.attr,
483 &sensor_dev_attr_in5_max.dev_attr.attr,
484 &sensor_dev_attr_in5_alarm.dev_attr.attr,
485 &sensor_dev_attr_in6_input.dev_attr.attr,
486 &sensor_dev_attr_in6_min.dev_attr.attr,
487 &sensor_dev_attr_in6_max.dev_attr.attr,
488 &sensor_dev_attr_in6_alarm.dev_attr.attr,
489 &dev_attr_temp1_input.attr,
490 &dev_attr_temp1_max.attr,
491 &dev_attr_temp1_max_hyst.attr,
492 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
493 &sensor_dev_attr_fan1_input.dev_attr.attr,
494 &sensor_dev_attr_fan1_min.dev_attr.attr,
495 &sensor_dev_attr_fan1_div.dev_attr.attr,
496 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
497 &sensor_dev_attr_fan2_input.dev_attr.attr,
498 &sensor_dev_attr_fan2_min.dev_attr.attr,
499 &sensor_dev_attr_fan2_div.dev_attr.attr,
500 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
501 &sensor_dev_attr_fan3_input.dev_attr.attr,
502 &sensor_dev_attr_fan3_min.dev_attr.attr,
503 &sensor_dev_attr_fan3_div.dev_attr.attr,
504 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
505 &dev_attr_alarms.attr,
506 &dev_attr_cpu0_vid.attr,
507
508 NULL
509 };
510
511 static const struct attribute_group lm78_group = {
512 .attrs = lm78_attributes,
513 };
514
515 /* I2C devices get this name attribute automatically, but for ISA devices
516 we must create it by ourselves. */
517 static ssize_t show_name(struct device *dev, struct device_attribute
518 *devattr, char *buf)
519 {
520 struct lm78_data *data = dev_get_drvdata(dev);
521
522 return sprintf(buf, "%s\n", data->name);
523 }
524 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
525
526 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
527 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
528 {
529 struct lm78_data *isa;
530 int i;
531
532 if (!pdev) /* No ISA chip */
533 return 0;
534 isa = platform_get_drvdata(pdev);
535
536 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
537 return 0; /* Address doesn't match */
538 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
539 return 0; /* Chip type doesn't match */
540
541 /* We compare all the limit registers, the config register and the
542 * interrupt mask registers */
543 for (i = 0x2b; i <= 0x3d; i++) {
544 if (lm78_read_value(isa, i) !=
545 i2c_smbus_read_byte_data(client, i))
546 return 0;
547 }
548 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
549 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
550 return 0;
551 for (i = 0x43; i <= 0x46; i++) {
552 if (lm78_read_value(isa, i) !=
553 i2c_smbus_read_byte_data(client, i))
554 return 0;
555 }
556
557 return 1;
558 }
559
560 static int lm78_i2c_detect(struct i2c_client *client,
561 struct i2c_board_info *info)
562 {
563 int i;
564 struct lm78_data *isa = pdev ? platform_get_drvdata(pdev) : NULL;
565 const char *client_name;
566 struct i2c_adapter *adapter = client->adapter;
567 int address = client->addr;
568
569 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
570 return -ENODEV;
571
572 /* We block updates of the ISA device to minimize the risk of
573 concurrent access to the same LM78 chip through different
574 interfaces. */
575 if (isa)
576 mutex_lock(&isa->update_lock);
577
578 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
579 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
580 goto err_nodev;
581
582 /* Explicitly prevent the misdetection of Winbond chips */
583 i = i2c_smbus_read_byte_data(client, 0x4f);
584 if (i == 0xa3 || i == 0x5c)
585 goto err_nodev;
586
587 /* Determine the chip type. */
588 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
589 if (i == 0x00 || i == 0x20 /* LM78 */
590 || i == 0x40) /* LM78-J */
591 client_name = "lm78";
592 else if ((i & 0xfe) == 0xc0)
593 client_name = "lm79";
594 else
595 goto err_nodev;
596
597 if (lm78_alias_detect(client, i)) {
598 dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
599 "be the same as ISA device\n", address);
600 goto err_nodev;
601 }
602
603 if (isa)
604 mutex_unlock(&isa->update_lock);
605
606 strlcpy(info->type, client_name, I2C_NAME_SIZE);
607
608 return 0;
609
610 err_nodev:
611 if (isa)
612 mutex_unlock(&isa->update_lock);
613 return -ENODEV;
614 }
615
616 static int lm78_i2c_probe(struct i2c_client *client,
617 const struct i2c_device_id *id)
618 {
619 struct lm78_data *data;
620 int err;
621
622 data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL);
623 if (!data)
624 return -ENOMEM;
625
626 i2c_set_clientdata(client, data);
627 data->client = client;
628 data->type = id->driver_data;
629
630 /* Initialize the LM78 chip */
631 lm78_init_device(data);
632
633 /* Register sysfs hooks */
634 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
635 if (err)
636 goto ERROR3;
637
638 data->hwmon_dev = hwmon_device_register(&client->dev);
639 if (IS_ERR(data->hwmon_dev)) {
640 err = PTR_ERR(data->hwmon_dev);
641 goto ERROR4;
642 }
643
644 return 0;
645
646 ERROR4:
647 sysfs_remove_group(&client->dev.kobj, &lm78_group);
648 ERROR3:
649 kfree(data);
650 return err;
651 }
652
653 static int lm78_i2c_remove(struct i2c_client *client)
654 {
655 struct lm78_data *data = i2c_get_clientdata(client);
656
657 hwmon_device_unregister(data->hwmon_dev);
658 sysfs_remove_group(&client->dev.kobj, &lm78_group);
659 kfree(data);
660
661 return 0;
662 }
663
664 static int __devinit lm78_isa_probe(struct platform_device *pdev)
665 {
666 int err;
667 struct lm78_data *data;
668 struct resource *res;
669
670 /* Reserve the ISA region */
671 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
672 if (!request_region(res->start + LM78_ADDR_REG_OFFSET, 2, "lm78")) {
673 err = -EBUSY;
674 goto exit;
675 }
676
677 if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
678 err = -ENOMEM;
679 goto exit_release_region;
680 }
681 mutex_init(&data->lock);
682 data->isa_addr = res->start;
683 platform_set_drvdata(pdev, data);
684
685 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
686 data->type = lm79;
687 data->name = "lm79";
688 } else {
689 data->type = lm78;
690 data->name = "lm78";
691 }
692
693 /* Initialize the LM78 chip */
694 lm78_init_device(data);
695
696 /* Register sysfs hooks */
697 if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group))
698 || (err = device_create_file(&pdev->dev, &dev_attr_name)))
699 goto exit_remove_files;
700
701 data->hwmon_dev = hwmon_device_register(&pdev->dev);
702 if (IS_ERR(data->hwmon_dev)) {
703 err = PTR_ERR(data->hwmon_dev);
704 goto exit_remove_files;
705 }
706
707 return 0;
708
709 exit_remove_files:
710 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
711 device_remove_file(&pdev->dev, &dev_attr_name);
712 kfree(data);
713 exit_release_region:
714 release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
715 exit:
716 return err;
717 }
718
719 static int __devexit lm78_isa_remove(struct platform_device *pdev)
720 {
721 struct lm78_data *data = platform_get_drvdata(pdev);
722 struct resource *res;
723
724 hwmon_device_unregister(data->hwmon_dev);
725 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
726 device_remove_file(&pdev->dev, &dev_attr_name);
727 kfree(data);
728
729 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
730 release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
731
732 return 0;
733 }
734
735 /* The SMBus locks itself, but ISA access must be locked explicitly!
736 We don't want to lock the whole ISA bus, so we lock each client
737 separately.
738 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
739 would slow down the LM78 access and should not be necessary. */
740 static int lm78_read_value(struct lm78_data *data, u8 reg)
741 {
742 struct i2c_client *client = data->client;
743
744 if (!client) { /* ISA device */
745 int res;
746 mutex_lock(&data->lock);
747 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
748 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
749 mutex_unlock(&data->lock);
750 return res;
751 } else
752 return i2c_smbus_read_byte_data(client, reg);
753 }
754
755 /* The SMBus locks itself, but ISA access muse be locked explicitly!
756 We don't want to lock the whole ISA bus, so we lock each client
757 separately.
758 We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
759 would slow down the LM78 access and should not be necessary.
760 There are some ugly typecasts here, but the good new is - they should
761 nowhere else be necessary! */
762 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
763 {
764 struct i2c_client *client = data->client;
765
766 if (!client) { /* ISA device */
767 mutex_lock(&data->lock);
768 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
769 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
770 mutex_unlock(&data->lock);
771 return 0;
772 } else
773 return i2c_smbus_write_byte_data(client, reg, value);
774 }
775
776 static void lm78_init_device(struct lm78_data *data)
777 {
778 u8 config;
779 int i;
780
781 /* Start monitoring */
782 config = lm78_read_value(data, LM78_REG_CONFIG);
783 if ((config & 0x09) != 0x01)
784 lm78_write_value(data, LM78_REG_CONFIG,
785 (config & 0xf7) | 0x01);
786
787 /* A few vars need to be filled upon startup */
788 for (i = 0; i < 3; i++) {
789 data->fan_min[i] = lm78_read_value(data,
790 LM78_REG_FAN_MIN(i));
791 }
792
793 mutex_init(&data->update_lock);
794 }
795
796 static struct lm78_data *lm78_update_device(struct device *dev)
797 {
798 struct lm78_data *data = dev_get_drvdata(dev);
799 int i;
800
801 mutex_lock(&data->update_lock);
802
803 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
804 || !data->valid) {
805
806 dev_dbg(dev, "Starting lm78 update\n");
807
808 for (i = 0; i <= 6; i++) {
809 data->in[i] =
810 lm78_read_value(data, LM78_REG_IN(i));
811 data->in_min[i] =
812 lm78_read_value(data, LM78_REG_IN_MIN(i));
813 data->in_max[i] =
814 lm78_read_value(data, LM78_REG_IN_MAX(i));
815 }
816 for (i = 0; i < 3; i++) {
817 data->fan[i] =
818 lm78_read_value(data, LM78_REG_FAN(i));
819 data->fan_min[i] =
820 lm78_read_value(data, LM78_REG_FAN_MIN(i));
821 }
822 data->temp = lm78_read_value(data, LM78_REG_TEMP);
823 data->temp_over =
824 lm78_read_value(data, LM78_REG_TEMP_OVER);
825 data->temp_hyst =
826 lm78_read_value(data, LM78_REG_TEMP_HYST);
827 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
828 data->vid = i & 0x0f;
829 if (data->type == lm79)
830 data->vid |=
831 (lm78_read_value(data, LM78_REG_CHIPID) &
832 0x01) << 4;
833 else
834 data->vid |= 0x10;
835 data->fan_div[0] = (i >> 4) & 0x03;
836 data->fan_div[1] = i >> 6;
837 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
838 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
839 data->last_updated = jiffies;
840 data->valid = 1;
841
842 data->fan_div[2] = 1;
843 }
844
845 mutex_unlock(&data->update_lock);
846
847 return data;
848 }
849
850 /* return 1 if a supported chip is found, 0 otherwise */
851 static int __init lm78_isa_found(unsigned short address)
852 {
853 int val, save, found = 0;
854
855 /* We have to request the region in two parts because some
856 boards declare base+4 to base+7 as a PNP device */
857 if (!request_region(address, 4, "lm78")) {
858 pr_debug("lm78: Failed to request low part of region\n");
859 return 0;
860 }
861 if (!request_region(address + 4, 4, "lm78")) {
862 pr_debug("lm78: Failed to request high part of region\n");
863 release_region(address, 4);
864 return 0;
865 }
866
867 #define REALLY_SLOW_IO
868 /* We need the timeouts for at least some LM78-like
869 chips. But only if we read 'undefined' registers. */
870 val = inb_p(address + 1);
871 if (inb_p(address + 2) != val
872 || inb_p(address + 3) != val
873 || inb_p(address + 7) != val)
874 goto release;
875 #undef REALLY_SLOW_IO
876
877 /* We should be able to change the 7 LSB of the address port. The
878 MSB (busy flag) should be clear initially, set after the write. */
879 save = inb_p(address + LM78_ADDR_REG_OFFSET);
880 if (save & 0x80)
881 goto release;
882 val = ~save & 0x7f;
883 outb_p(val, address + LM78_ADDR_REG_OFFSET);
884 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
885 outb_p(save, address + LM78_ADDR_REG_OFFSET);
886 goto release;
887 }
888
889 /* We found a device, now see if it could be an LM78 */
890 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
891 val = inb_p(address + LM78_DATA_REG_OFFSET);
892 if (val & 0x80)
893 goto release;
894 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
895 val = inb_p(address + LM78_DATA_REG_OFFSET);
896 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
897 goto release;
898
899 /* The busy flag should be clear again */
900 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
901 goto release;
902
903 /* Explicitly prevent the misdetection of Winbond chips */
904 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
905 val = inb_p(address + LM78_DATA_REG_OFFSET);
906 if (val == 0xa3 || val == 0x5c)
907 goto release;
908
909 /* Explicitly prevent the misdetection of ITE chips */
910 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
911 val = inb_p(address + LM78_DATA_REG_OFFSET);
912 if (val == 0x90)
913 goto release;
914
915 /* Determine the chip type */
916 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
917 val = inb_p(address + LM78_DATA_REG_OFFSET);
918 if (val == 0x00 || val == 0x20 /* LM78 */
919 || val == 0x40 /* LM78-J */
920 || (val & 0xfe) == 0xc0) /* LM79 */
921 found = 1;
922
923 if (found)
924 pr_info("lm78: Found an %s chip at %#x\n",
925 val & 0x80 ? "LM79" : "LM78", (int)address);
926
927 release:
928 release_region(address + 4, 4);
929 release_region(address, 4);
930 return found;
931 }
932
933 static int __init lm78_isa_device_add(unsigned short address)
934 {
935 struct resource res = {
936 .start = address,
937 .end = address + LM78_EXTENT - 1,
938 .name = "lm78",
939 .flags = IORESOURCE_IO,
940 };
941 int err;
942
943 pdev = platform_device_alloc("lm78", address);
944 if (!pdev) {
945 err = -ENOMEM;
946 printk(KERN_ERR "lm78: Device allocation failed\n");
947 goto exit;
948 }
949
950 err = platform_device_add_resources(pdev, &res, 1);
951 if (err) {
952 printk(KERN_ERR "lm78: Device resource addition failed "
953 "(%d)\n", err);
954 goto exit_device_put;
955 }
956
957 err = platform_device_add(pdev);
958 if (err) {
959 printk(KERN_ERR "lm78: Device addition failed (%d)\n",
960 err);
961 goto exit_device_put;
962 }
963
964 return 0;
965
966 exit_device_put:
967 platform_device_put(pdev);
968 exit:
969 pdev = NULL;
970 return err;
971 }
972
973 static int __init sm_lm78_init(void)
974 {
975 int res;
976
977 /* We register the ISA device first, so that we can skip the
978 * registration of an I2C interface to the same device. */
979 if (lm78_isa_found(isa_address)) {
980 res = platform_driver_register(&lm78_isa_driver);
981 if (res)
982 goto exit;
983
984 /* Sets global pdev as a side effect */
985 res = lm78_isa_device_add(isa_address);
986 if (res)
987 goto exit_unreg_isa_driver;
988 }
989
990 res = i2c_add_driver(&lm78_driver);
991 if (res)
992 goto exit_unreg_isa_device;
993
994 return 0;
995
996 exit_unreg_isa_device:
997 platform_device_unregister(pdev);
998 exit_unreg_isa_driver:
999 platform_driver_unregister(&lm78_isa_driver);
1000 exit:
1001 return res;
1002 }
1003
1004 static void __exit sm_lm78_exit(void)
1005 {
1006 if (pdev) {
1007 platform_device_unregister(pdev);
1008 platform_driver_unregister(&lm78_isa_driver);
1009 }
1010 i2c_del_driver(&lm78_driver);
1011 }
1012
1013
1014
1015 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
1016 MODULE_DESCRIPTION("LM78/LM79 driver");
1017 MODULE_LICENSE("GPL");
1018
1019 module_init(sm_lm78_init);
1020 module_exit(sm_lm78_exit);
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