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Disintegrate asm/system.h for ARM
[linux-2.6.git] / drivers / hwmon / lm78.c
blobf6bc414e1e91eebb256837074996545ca781d2b1
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, 2011 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/jiffies.h>
28 #include <linux/i2c.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
35 #ifdef CONFIG_ISA
36 #include <linux/platform_device.h>
37 #include <linux/ioport.h>
38 #include <linux/io.h>
39 #endif
40
41 /* Addresses to scan */
42 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
43 0x2e, 0x2f, I2C_CLIENT_END };
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 /*
78 * Conversions. Rounding and limit checking is only done on the TO_REG
79 * variants.
80 */
81
82 /*
83 * IN: mV (0V to 4.08V)
84 * REG: 16mV/bit
85 */
86 static inline u8 IN_TO_REG(unsigned long val)
87 {
88 unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
89 return (nval + 8) / 16;
90 }
91 #define IN_FROM_REG(val) ((val) * 16)
92
93 static inline u8 FAN_TO_REG(long rpm, int div)
94 {
95 if (rpm <= 0)
96 return 255;
97 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
98 }
99
100 static inline int FAN_FROM_REG(u8 val, int div)
101 {
102 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
103 }
104
105 /*
106 * TEMP: mC (-128C to +127C)
107 * REG: 1C/bit, two's complement
108 */
109 static inline s8 TEMP_TO_REG(int val)
110 {
111 int nval = SENSORS_LIMIT(val, -128000, 127000) ;
112 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
113 }
114
115 static inline int TEMP_FROM_REG(s8 val)
116 {
117 return val * 1000;
118 }
119
120 #define DIV_FROM_REG(val) (1 << (val))
121
122 struct lm78_data {
123 struct i2c_client *client;
124 struct device *hwmon_dev;
125 struct mutex lock;
126 enum chips type;
127
128 /* For ISA device only */
129 const char *name;
130 int isa_addr;
131
132 struct mutex update_lock;
133 char valid; /* !=0 if following fields are valid */
134 unsigned long last_updated; /* In jiffies */
135
136 u8 in[7]; /* Register value */
137 u8 in_max[7]; /* Register value */
138 u8 in_min[7]; /* Register value */
139 u8 fan[3]; /* Register value */
140 u8 fan_min[3]; /* Register value */
141 s8 temp; /* Register value */
142 s8 temp_over; /* Register value */
143 s8 temp_hyst; /* Register value */
144 u8 fan_div[3]; /* Register encoding, shifted right */
145 u8 vid; /* Register encoding, combined */
146 u16 alarms; /* Register encoding, combined */
147 };
148
149
150 static int lm78_read_value(struct lm78_data *data, u8 reg);
151 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
152 static struct lm78_data *lm78_update_device(struct device *dev);
153 static void lm78_init_device(struct lm78_data *data);
154
155
156 /* 7 Voltages */
157 static ssize_t show_in(struct device *dev, struct device_attribute *da,
158 char *buf)
159 {
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
161 struct lm78_data *data = lm78_update_device(dev);
162 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
163 }
164
165 static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
166 char *buf)
167 {
168 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
169 struct lm78_data *data = lm78_update_device(dev);
170 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
171 }
172
173 static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
174 char *buf)
175 {
176 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
177 struct lm78_data *data = lm78_update_device(dev);
178 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
179 }
180
181 static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
182 const char *buf, size_t count)
183 {
184 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
185 struct lm78_data *data = dev_get_drvdata(dev);
186 int nr = attr->index;
187 unsigned long val;
188 int err;
189
190 err = kstrtoul(buf, 10, &val);
191 if (err)
192 return err;
193
194 mutex_lock(&data->update_lock);
195 data->in_min[nr] = IN_TO_REG(val);
196 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
197 mutex_unlock(&data->update_lock);
198 return count;
199 }
200
201 static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
202 const char *buf, size_t count)
203 {
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
205 struct lm78_data *data = dev_get_drvdata(dev);
206 int nr = attr->index;
207 unsigned long val;
208 int err;
209
210 err = kstrtoul(buf, 10, &val);
211 if (err)
212 return err;
213
214 mutex_lock(&data->update_lock);
215 data->in_max[nr] = IN_TO_REG(val);
216 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
217 mutex_unlock(&data->update_lock);
218 return count;
219 }
220
221 #define show_in_offset(offset) \
222 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
223 show_in, NULL, offset); \
224 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
225 show_in_min, set_in_min, offset); \
226 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
227 show_in_max, set_in_max, offset);
228
229 show_in_offset(0);
230 show_in_offset(1);
231 show_in_offset(2);
232 show_in_offset(3);
233 show_in_offset(4);
234 show_in_offset(5);
235 show_in_offset(6);
236
237 /* Temperature */
238 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
239 char *buf)
240 {
241 struct lm78_data *data = lm78_update_device(dev);
242 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
243 }
244
245 static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
246 char *buf)
247 {
248 struct lm78_data *data = lm78_update_device(dev);
249 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
250 }
251
252 static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
253 const char *buf, size_t count)
254 {
255 struct lm78_data *data = dev_get_drvdata(dev);
256 long val;
257 int err;
258
259 err = kstrtol(buf, 10, &val);
260 if (err)
261 return err;
262
263 mutex_lock(&data->update_lock);
264 data->temp_over = TEMP_TO_REG(val);
265 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
266 mutex_unlock(&data->update_lock);
267 return count;
268 }
269
270 static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
271 char *buf)
272 {
273 struct lm78_data *data = lm78_update_device(dev);
274 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
275 }
276
277 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
278 const char *buf, size_t count)
279 {
280 struct lm78_data *data = dev_get_drvdata(dev);
281 long val;
282 int err;
283
284 err = kstrtol(buf, 10, &val);
285 if (err)
286 return err;
287
288 mutex_lock(&data->update_lock);
289 data->temp_hyst = TEMP_TO_REG(val);
290 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
291 mutex_unlock(&data->update_lock);
292 return count;
293 }
294
295 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
296 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
297 show_temp_over, set_temp_over);
298 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
299 show_temp_hyst, set_temp_hyst);
300
301 /* 3 Fans */
302 static ssize_t show_fan(struct device *dev, struct device_attribute *da,
303 char *buf)
304 {
305 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
306 struct lm78_data *data = lm78_update_device(dev);
307 int nr = attr->index;
308 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
309 DIV_FROM_REG(data->fan_div[nr])));
310 }
311
312 static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
313 char *buf)
314 {
315 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
316 struct lm78_data *data = lm78_update_device(dev);
317 int nr = attr->index;
318 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
319 DIV_FROM_REG(data->fan_div[nr])));
320 }
321
322 static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
323 const char *buf, size_t count)
324 {
325 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
326 struct lm78_data *data = dev_get_drvdata(dev);
327 int nr = attr->index;
328 unsigned long val;
329 int err;
330
331 err = kstrtoul(buf, 10, &val);
332 if (err)
333 return err;
334
335 mutex_lock(&data->update_lock);
336 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
337 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
338 mutex_unlock(&data->update_lock);
339 return count;
340 }
341
342 static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
343 char *buf)
344 {
345 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
346 struct lm78_data *data = lm78_update_device(dev);
347 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
348 }
349
350 /*
351 * Note: we save and restore the fan minimum here, because its value is
352 * determined in part by the fan divisor. This follows the principle of
353 * least surprise; the user doesn't expect the fan minimum to change just
354 * because the divisor changed.
355 */
356 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
357 const char *buf, size_t count)
358 {
359 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
360 struct lm78_data *data = dev_get_drvdata(dev);
361 int nr = attr->index;
362 unsigned long min;
363 u8 reg;
364 unsigned long val;
365 int err;
366
367 err = kstrtoul(buf, 10, &val);
368 if (err)
369 return err;
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:
377 data->fan_div[nr] = 0;
378 break;
379 case 2:
380 data->fan_div[nr] = 1;
381 break;
382 case 4:
383 data->fan_div[nr] = 2;
384 break;
385 case 8:
386 data->fan_div[nr] = 3;
387 break;
388 default:
389 dev_err(dev, "fan_div value %ld not "
390 "supported. Choose one of 1, 2, 4 or 8!\n", val);
391 mutex_unlock(&data->update_lock);
392 return -EINVAL;
393 }
394
395 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
396 switch (nr) {
397 case 0:
398 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
399 break;
400 case 1:
401 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
402 break;
403 }
404 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
405
406 data->fan_min[nr] =
407 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
408 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
409 mutex_unlock(&data->update_lock);
410
411 return count;
412 }
413
414 #define show_fan_offset(offset) \
415 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
416 show_fan, NULL, offset - 1); \
417 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
418 show_fan_min, set_fan_min, offset - 1);
419
420 show_fan_offset(1);
421 show_fan_offset(2);
422 show_fan_offset(3);
423
424 /* Fan 3 divisor is locked in H/W */
425 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
426 show_fan_div, set_fan_div, 0);
427 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
428 show_fan_div, set_fan_div, 1);
429 static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
430
431 /* VID */
432 static ssize_t show_vid(struct device *dev, struct device_attribute *da,
433 char *buf)
434 {
435 struct lm78_data *data = lm78_update_device(dev);
436 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
437 }
438 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
439
440 /* Alarms */
441 static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
442 char *buf)
443 {
444 struct lm78_data *data = lm78_update_device(dev);
445 return sprintf(buf, "%u\n", data->alarms);
446 }
447 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
448
449 static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
450 char *buf)
451 {
452 struct lm78_data *data = lm78_update_device(dev);
453 int nr = to_sensor_dev_attr(da)->index;
454 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
455 }
456 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
457 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
458 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
459 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
460 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
461 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
462 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
463 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
464 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
465 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
466 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
467
468 static struct attribute *lm78_attributes[] = {
469 &sensor_dev_attr_in0_input.dev_attr.attr,
470 &sensor_dev_attr_in0_min.dev_attr.attr,
471 &sensor_dev_attr_in0_max.dev_attr.attr,
472 &sensor_dev_attr_in0_alarm.dev_attr.attr,
473 &sensor_dev_attr_in1_input.dev_attr.attr,
474 &sensor_dev_attr_in1_min.dev_attr.attr,
475 &sensor_dev_attr_in1_max.dev_attr.attr,
476 &sensor_dev_attr_in1_alarm.dev_attr.attr,
477 &sensor_dev_attr_in2_input.dev_attr.attr,
478 &sensor_dev_attr_in2_min.dev_attr.attr,
479 &sensor_dev_attr_in2_max.dev_attr.attr,
480 &sensor_dev_attr_in2_alarm.dev_attr.attr,
481 &sensor_dev_attr_in3_input.dev_attr.attr,
482 &sensor_dev_attr_in3_min.dev_attr.attr,
483 &sensor_dev_attr_in3_max.dev_attr.attr,
484 &sensor_dev_attr_in3_alarm.dev_attr.attr,
485 &sensor_dev_attr_in4_input.dev_attr.attr,
486 &sensor_dev_attr_in4_min.dev_attr.attr,
487 &sensor_dev_attr_in4_max.dev_attr.attr,
488 &sensor_dev_attr_in4_alarm.dev_attr.attr,
489 &sensor_dev_attr_in5_input.dev_attr.attr,
490 &sensor_dev_attr_in5_min.dev_attr.attr,
491 &sensor_dev_attr_in5_max.dev_attr.attr,
492 &sensor_dev_attr_in5_alarm.dev_attr.attr,
493 &sensor_dev_attr_in6_input.dev_attr.attr,
494 &sensor_dev_attr_in6_min.dev_attr.attr,
495 &sensor_dev_attr_in6_max.dev_attr.attr,
496 &sensor_dev_attr_in6_alarm.dev_attr.attr,
497 &dev_attr_temp1_input.attr,
498 &dev_attr_temp1_max.attr,
499 &dev_attr_temp1_max_hyst.attr,
500 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
501 &sensor_dev_attr_fan1_input.dev_attr.attr,
502 &sensor_dev_attr_fan1_min.dev_attr.attr,
503 &sensor_dev_attr_fan1_div.dev_attr.attr,
504 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
505 &sensor_dev_attr_fan2_input.dev_attr.attr,
506 &sensor_dev_attr_fan2_min.dev_attr.attr,
507 &sensor_dev_attr_fan2_div.dev_attr.attr,
508 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
509 &sensor_dev_attr_fan3_input.dev_attr.attr,
510 &sensor_dev_attr_fan3_min.dev_attr.attr,
511 &sensor_dev_attr_fan3_div.dev_attr.attr,
512 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
513 &dev_attr_alarms.attr,
514 &dev_attr_cpu0_vid.attr,
515
516 NULL
517 };
518
519 static const struct attribute_group lm78_group = {
520 .attrs = lm78_attributes,
521 };
522
523 /*
524 * ISA related code
525 */
526 #ifdef CONFIG_ISA
527
528 /* ISA device, if found */
529 static struct platform_device *pdev;
530
531 static unsigned short isa_address = 0x290;
532
533 /*
534 * I2C devices get this name attribute automatically, but for ISA devices
535 * we must create it by ourselves.
536 */
537 static ssize_t show_name(struct device *dev, struct device_attribute
538 *devattr, char *buf)
539 {
540 struct lm78_data *data = dev_get_drvdata(dev);
541
542 return sprintf(buf, "%s\n", data->name);
543 }
544 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
545
546 static struct lm78_data *lm78_data_if_isa(void)
547 {
548 return pdev ? platform_get_drvdata(pdev) : NULL;
549 }
550
551 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
552 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
553 {
554 struct lm78_data *isa;
555 int i;
556
557 if (!pdev) /* No ISA chip */
558 return 0;
559 isa = platform_get_drvdata(pdev);
560
561 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
562 return 0; /* Address doesn't match */
563 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
564 return 0; /* Chip type doesn't match */
565
566 /*
567 * We compare all the limit registers, the config register and the
568 * interrupt mask registers
569 */
570 for (i = 0x2b; i <= 0x3d; i++) {
571 if (lm78_read_value(isa, i) !=
572 i2c_smbus_read_byte_data(client, i))
573 return 0;
574 }
575 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
576 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
577 return 0;
578 for (i = 0x43; i <= 0x46; i++) {
579 if (lm78_read_value(isa, i) !=
580 i2c_smbus_read_byte_data(client, i))
581 return 0;
582 }
583
584 return 1;
585 }
586 #else /* !CONFIG_ISA */
587
588 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
589 {
590 return 0;
591 }
592
593 static struct lm78_data *lm78_data_if_isa(void)
594 {
595 return NULL;
596 }
597 #endif /* CONFIG_ISA */
598
599 static int lm78_i2c_detect(struct i2c_client *client,
600 struct i2c_board_info *info)
601 {
602 int i;
603 struct lm78_data *isa = lm78_data_if_isa();
604 const char *client_name;
605 struct i2c_adapter *adapter = client->adapter;
606 int address = client->addr;
607
608 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
609 return -ENODEV;
610
611 /*
612 * We block updates of the ISA device to minimize the risk of
613 * concurrent access to the same LM78 chip through different
614 * interfaces.
615 */
616 if (isa)
617 mutex_lock(&isa->update_lock);
618
619 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
620 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
621 goto err_nodev;
622
623 /* Explicitly prevent the misdetection of Winbond chips */
624 i = i2c_smbus_read_byte_data(client, 0x4f);
625 if (i == 0xa3 || i == 0x5c)
626 goto err_nodev;
627
628 /* Determine the chip type. */
629 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
630 if (i == 0x00 || i == 0x20 /* LM78 */
631 || i == 0x40) /* LM78-J */
632 client_name = "lm78";
633 else if ((i & 0xfe) == 0xc0)
634 client_name = "lm79";
635 else
636 goto err_nodev;
637
638 if (lm78_alias_detect(client, i)) {
639 dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
640 "be the same as ISA device\n", address);
641 goto err_nodev;
642 }
643
644 if (isa)
645 mutex_unlock(&isa->update_lock);
646
647 strlcpy(info->type, client_name, I2C_NAME_SIZE);
648
649 return 0;
650
651 err_nodev:
652 if (isa)
653 mutex_unlock(&isa->update_lock);
654 return -ENODEV;
655 }
656
657 static int lm78_i2c_probe(struct i2c_client *client,
658 const struct i2c_device_id *id)
659 {
660 struct lm78_data *data;
661 int err;
662
663 data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL);
664 if (!data)
665 return -ENOMEM;
666
667 i2c_set_clientdata(client, data);
668 data->client = client;
669 data->type = id->driver_data;
670
671 /* Initialize the LM78 chip */
672 lm78_init_device(data);
673
674 /* Register sysfs hooks */
675 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
676 if (err)
677 goto ERROR3;
678
679 data->hwmon_dev = hwmon_device_register(&client->dev);
680 if (IS_ERR(data->hwmon_dev)) {
681 err = PTR_ERR(data->hwmon_dev);
682 goto ERROR4;
683 }
684
685 return 0;
686
687 ERROR4:
688 sysfs_remove_group(&client->dev.kobj, &lm78_group);
689 ERROR3:
690 kfree(data);
691 return err;
692 }
693
694 static int lm78_i2c_remove(struct i2c_client *client)
695 {
696 struct lm78_data *data = i2c_get_clientdata(client);
697
698 hwmon_device_unregister(data->hwmon_dev);
699 sysfs_remove_group(&client->dev.kobj, &lm78_group);
700 kfree(data);
701
702 return 0;
703 }
704
705 static const struct i2c_device_id lm78_i2c_id[] = {
706 { "lm78", lm78 },
707 { "lm79", lm79 },
708 { }
709 };
710 MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
711
712 static struct i2c_driver lm78_driver = {
713 .class = I2C_CLASS_HWMON,
714 .driver = {
715 .name = "lm78",
716 },
717 .probe = lm78_i2c_probe,
718 .remove = lm78_i2c_remove,
719 .id_table = lm78_i2c_id,
720 .detect = lm78_i2c_detect,
721 .address_list = normal_i2c,
722 };
723
724 /*
725 * The SMBus locks itself, but ISA access must be locked explicitly!
726 * We don't want to lock the whole ISA bus, so we lock each client
727 * separately.
728 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
729 * would slow down the LM78 access and should not be necessary.
730 */
731 static int lm78_read_value(struct lm78_data *data, u8 reg)
732 {
733 struct i2c_client *client = data->client;
734
735 #ifdef CONFIG_ISA
736 if (!client) { /* ISA device */
737 int res;
738 mutex_lock(&data->lock);
739 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
740 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
741 mutex_unlock(&data->lock);
742 return res;
743 } else
744 #endif
745 return i2c_smbus_read_byte_data(client, reg);
746 }
747
748 static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
749 {
750 struct i2c_client *client = data->client;
751
752 #ifdef CONFIG_ISA
753 if (!client) { /* ISA device */
754 mutex_lock(&data->lock);
755 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
756 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
757 mutex_unlock(&data->lock);
758 return 0;
759 } else
760 #endif
761 return i2c_smbus_write_byte_data(client, reg, value);
762 }
763
764 static void lm78_init_device(struct lm78_data *data)
765 {
766 u8 config;
767 int i;
768
769 /* Start monitoring */
770 config = lm78_read_value(data, LM78_REG_CONFIG);
771 if ((config & 0x09) != 0x01)
772 lm78_write_value(data, LM78_REG_CONFIG,
773 (config & 0xf7) | 0x01);
774
775 /* A few vars need to be filled upon startup */
776 for (i = 0; i < 3; i++) {
777 data->fan_min[i] = lm78_read_value(data,
778 LM78_REG_FAN_MIN(i));
779 }
780
781 mutex_init(&data->update_lock);
782 }
783
784 static struct lm78_data *lm78_update_device(struct device *dev)
785 {
786 struct lm78_data *data = dev_get_drvdata(dev);
787 int i;
788
789 mutex_lock(&data->update_lock);
790
791 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
792 || !data->valid) {
793
794 dev_dbg(dev, "Starting lm78 update\n");
795
796 for (i = 0; i <= 6; i++) {
797 data->in[i] =
798 lm78_read_value(data, LM78_REG_IN(i));
799 data->in_min[i] =
800 lm78_read_value(data, LM78_REG_IN_MIN(i));
801 data->in_max[i] =
802 lm78_read_value(data, LM78_REG_IN_MAX(i));
803 }
804 for (i = 0; i < 3; i++) {
805 data->fan[i] =
806 lm78_read_value(data, LM78_REG_FAN(i));
807 data->fan_min[i] =
808 lm78_read_value(data, LM78_REG_FAN_MIN(i));
809 }
810 data->temp = lm78_read_value(data, LM78_REG_TEMP);
811 data->temp_over =
812 lm78_read_value(data, LM78_REG_TEMP_OVER);
813 data->temp_hyst =
814 lm78_read_value(data, LM78_REG_TEMP_HYST);
815 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
816 data->vid = i & 0x0f;
817 if (data->type == lm79)
818 data->vid |=
819 (lm78_read_value(data, LM78_REG_CHIPID) &
820 0x01) << 4;
821 else
822 data->vid |= 0x10;
823 data->fan_div[0] = (i >> 4) & 0x03;
824 data->fan_div[1] = i >> 6;
825 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
826 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
827 data->last_updated = jiffies;
828 data->valid = 1;
829
830 data->fan_div[2] = 1;
831 }
832
833 mutex_unlock(&data->update_lock);
834
835 return data;
836 }
837
838 #ifdef CONFIG_ISA
839 static int __devinit lm78_isa_probe(struct platform_device *pdev)
840 {
841 int err;
842 struct lm78_data *data;
843 struct resource *res;
844
845 /* Reserve the ISA region */
846 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
847 if (!request_region(res->start + LM78_ADDR_REG_OFFSET, 2, "lm78")) {
848 err = -EBUSY;
849 goto exit;
850 }
851
852 data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL);
853 if (!data) {
854 err = -ENOMEM;
855 goto exit_release_region;
856 }
857 mutex_init(&data->lock);
858 data->isa_addr = res->start;
859 platform_set_drvdata(pdev, data);
860
861 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
862 data->type = lm79;
863 data->name = "lm79";
864 } else {
865 data->type = lm78;
866 data->name = "lm78";
867 }
868
869 /* Initialize the LM78 chip */
870 lm78_init_device(data);
871
872 /* Register sysfs hooks */
873 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
874 if (err)
875 goto exit_remove_files;
876 err = device_create_file(&pdev->dev, &dev_attr_name);
877 if (err)
878 goto exit_remove_files;
879
880 data->hwmon_dev = hwmon_device_register(&pdev->dev);
881 if (IS_ERR(data->hwmon_dev)) {
882 err = PTR_ERR(data->hwmon_dev);
883 goto exit_remove_files;
884 }
885
886 return 0;
887
888 exit_remove_files:
889 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
890 device_remove_file(&pdev->dev, &dev_attr_name);
891 kfree(data);
892 exit_release_region:
893 release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
894 exit:
895 return err;
896 }
897
898 static int __devexit lm78_isa_remove(struct platform_device *pdev)
899 {
900 struct lm78_data *data = platform_get_drvdata(pdev);
901 struct resource *res;
902
903 hwmon_device_unregister(data->hwmon_dev);
904 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
905 device_remove_file(&pdev->dev, &dev_attr_name);
906 kfree(data);
907
908 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
909 release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
910
911 return 0;
912 }
913
914 static struct platform_driver lm78_isa_driver = {
915 .driver = {
916 .owner = THIS_MODULE,
917 .name = "lm78",
918 },
919 .probe = lm78_isa_probe,
920 .remove = __devexit_p(lm78_isa_remove),
921 };
922
923 /* return 1 if a supported chip is found, 0 otherwise */
924 static int __init lm78_isa_found(unsigned short address)
925 {
926 int val, save, found = 0;
927 int port;
928
929 /*
930 * Some boards declare base+0 to base+7 as a PNP device, some base+4
931 * to base+7 and some base+5 to base+6. So we better request each port
932 * individually for the probing phase.
933 */
934 for (port = address; port < address + LM78_EXTENT; port++) {
935 if (!request_region(port, 1, "lm78")) {
936 pr_debug("Failed to request port 0x%x\n", port);
937 goto release;
938 }
939 }
940
941 #define REALLY_SLOW_IO
942 /*
943 * We need the timeouts for at least some LM78-like
944 * chips. But only if we read 'undefined' registers.
945 */
946 val = inb_p(address + 1);
947 if (inb_p(address + 2) != val
948 || inb_p(address + 3) != val
949 || inb_p(address + 7) != val)
950 goto release;
951 #undef REALLY_SLOW_IO
952
953 /*
954 * We should be able to change the 7 LSB of the address port. The
955 * MSB (busy flag) should be clear initially, set after the write.
956 */
957 save = inb_p(address + LM78_ADDR_REG_OFFSET);
958 if (save & 0x80)
959 goto release;
960 val = ~save & 0x7f;
961 outb_p(val, address + LM78_ADDR_REG_OFFSET);
962 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
963 outb_p(save, address + LM78_ADDR_REG_OFFSET);
964 goto release;
965 }
966
967 /* We found a device, now see if it could be an LM78 */
968 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
969 val = inb_p(address + LM78_DATA_REG_OFFSET);
970 if (val & 0x80)
971 goto release;
972 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
973 val = inb_p(address + LM78_DATA_REG_OFFSET);
974 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
975 goto release;
976
977 /* The busy flag should be clear again */
978 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
979 goto release;
980
981 /* Explicitly prevent the misdetection of Winbond chips */
982 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
983 val = inb_p(address + LM78_DATA_REG_OFFSET);
984 if (val == 0xa3 || val == 0x5c)
985 goto release;
986
987 /* Explicitly prevent the misdetection of ITE chips */
988 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
989 val = inb_p(address + LM78_DATA_REG_OFFSET);
990 if (val == 0x90)
991 goto release;
992
993 /* Determine the chip type */
994 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
995 val = inb_p(address + LM78_DATA_REG_OFFSET);
996 if (val == 0x00 || val == 0x20 /* LM78 */
997 || val == 0x40 /* LM78-J */
998 || (val & 0xfe) == 0xc0) /* LM79 */
999 found = 1;
1000
1001 if (found)
1002 pr_info("Found an %s chip at %#x\n",
1003 val & 0x80 ? "LM79" : "LM78", (int)address);
1004
1005 release:
1006 for (port--; port >= address; port--)
1007 release_region(port, 1);
1008 return found;
1009 }
1010
1011 static int __init lm78_isa_device_add(unsigned short address)
1012 {
1013 struct resource res = {
1014 .start = address,
1015 .end = address + LM78_EXTENT - 1,
1016 .name = "lm78",
1017 .flags = IORESOURCE_IO,
1018 };
1019 int err;
1020
1021 pdev = platform_device_alloc("lm78", address);
1022 if (!pdev) {
1023 err = -ENOMEM;
1024 pr_err("Device allocation failed\n");
1025 goto exit;
1026 }
1027
1028 err = platform_device_add_resources(pdev, &res, 1);
1029 if (err) {
1030 pr_err("Device resource addition failed (%d)\n", err);
1031 goto exit_device_put;
1032 }
1033
1034 err = platform_device_add(pdev);
1035 if (err) {
1036 pr_err("Device addition failed (%d)\n", err);
1037 goto exit_device_put;
1038 }
1039
1040 return 0;
1041
1042 exit_device_put:
1043 platform_device_put(pdev);
1044 exit:
1045 pdev = NULL;
1046 return err;
1047 }
1048
1049 static int __init lm78_isa_register(void)
1050 {
1051 int res;
1052
1053 if (lm78_isa_found(isa_address)) {
1054 res = platform_driver_register(&lm78_isa_driver);
1055 if (res)
1056 goto exit;
1057
1058 /* Sets global pdev as a side effect */
1059 res = lm78_isa_device_add(isa_address);
1060 if (res)
1061 goto exit_unreg_isa_driver;
1062 }
1063
1064 return 0;
1065
1066 exit_unreg_isa_driver:
1067 platform_driver_unregister(&lm78_isa_driver);
1068 exit:
1069 return res;
1070 }
1071
1072 static void lm78_isa_unregister(void)
1073 {
1074 if (pdev) {
1075 platform_device_unregister(pdev);
1076 platform_driver_unregister(&lm78_isa_driver);
1077 }
1078 }
1079 #else /* !CONFIG_ISA */
1080
1081 static int __init lm78_isa_register(void)
1082 {
1083 return 0;
1084 }
1085
1086 static void lm78_isa_unregister(void)
1087 {
1088 }
1089 #endif /* CONFIG_ISA */
1090
1091 static int __init sm_lm78_init(void)
1092 {
1093 int res;
1094
1095 /*
1096 * We register the ISA device first, so that we can skip the
1097 * registration of an I2C interface to the same device.
1098 */
1099 res = lm78_isa_register();
1100 if (res)
1101 goto exit;
1102
1103 res = i2c_add_driver(&lm78_driver);
1104 if (res)
1105 goto exit_unreg_isa_device;
1106
1107 return 0;
1108
1109 exit_unreg_isa_device:
1110 lm78_isa_unregister();
1111 exit:
1112 return res;
1113 }
1114
1115 static void __exit sm_lm78_exit(void)
1116 {
1117 lm78_isa_unregister();
1118 i2c_del_driver(&lm78_driver);
1119 }
1120
1121 MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>");
1122 MODULE_DESCRIPTION("LM78/LM79 driver");
1123 MODULE_LICENSE("GPL");
1124
1125 module_init(sm_lm78_init);
1126 module_exit(sm_lm78_exit);
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