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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * lm78.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
6 * Copyright (c) 2007, 2011 Jean Delvare <jdelvare@suse.de>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/jiffies.h>
15#include <linux/i2c.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-vid.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/err.h>
20#include <linux/mutex.h>
21
22#ifdef CONFIG_ISA
23#include <linux/platform_device.h>
24#include <linux/ioport.h>
25#include <linux/io.h>
26#endif
27
28/* Addresses to scan */
29static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
30 0x2e, 0x2f, I2C_CLIENT_END };
31enum chips { lm78, lm79 };
32
33/* Many LM78 constants specified below */
34
35/* Length of ISA address segment */
36#define LM78_EXTENT 8
37
38/* Where are the ISA address/data registers relative to the base address */
39#define LM78_ADDR_REG_OFFSET 5
40#define LM78_DATA_REG_OFFSET 6
41
42/* The LM78 registers */
43#define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
44#define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
45#define LM78_REG_IN(nr) (0x20 + (nr))
46
47#define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
48#define LM78_REG_FAN(nr) (0x28 + (nr))
49
50#define LM78_REG_TEMP 0x27
51#define LM78_REG_TEMP_OVER 0x39
52#define LM78_REG_TEMP_HYST 0x3a
53
54#define LM78_REG_ALARM1 0x41
55#define LM78_REG_ALARM2 0x42
56
57#define LM78_REG_VID_FANDIV 0x47
58
59#define LM78_REG_CONFIG 0x40
60#define LM78_REG_CHIPID 0x49
61#define LM78_REG_I2C_ADDR 0x48
62
63/*
64 * Conversions. Rounding and limit checking is only done on the TO_REG
65 * variants.
66 */
67
68/*
69 * IN: mV (0V to 4.08V)
70 * REG: 16mV/bit
71 */
72static inline u8 IN_TO_REG(unsigned long val)
73{
74 unsigned long nval = clamp_val(val, 0, 4080);
75 return (nval + 8) / 16;
76}
77#define IN_FROM_REG(val) ((val) * 16)
78
79static inline u8 FAN_TO_REG(long rpm, int div)
80{
81 if (rpm <= 0)
82 return 255;
83 if (rpm > 1350000)
84 return 1;
85 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
86}
87
88static inline int FAN_FROM_REG(u8 val, int div)
89{
90 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
91}
92
93/*
94 * TEMP: mC (-128C to +127C)
95 * REG: 1C/bit, two's complement
96 */
97static inline s8 TEMP_TO_REG(long val)
98{
99 int nval = clamp_val(val, -128000, 127000) ;
100 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
101}
102
103static inline int TEMP_FROM_REG(s8 val)
104{
105 return val * 1000;
106}
107
108#define DIV_FROM_REG(val) (1 << (val))
109
110struct lm78_data {
111 struct i2c_client *client;
112 struct mutex lock;
113 enum chips type;
114
115 /* For ISA device only */
116 const char *name;
117 int isa_addr;
118
119 struct mutex update_lock;
120 char valid; /* !=0 if following fields are valid */
121 unsigned long last_updated; /* In jiffies */
122
123 u8 in[7]; /* Register value */
124 u8 in_max[7]; /* Register value */
125 u8 in_min[7]; /* Register value */
126 u8 fan[3]; /* Register value */
127 u8 fan_min[3]; /* Register value */
128 s8 temp; /* Register value */
129 s8 temp_over; /* Register value */
130 s8 temp_hyst; /* Register value */
131 u8 fan_div[3]; /* Register encoding, shifted right */
132 u8 vid; /* Register encoding, combined */
133 u16 alarms; /* Register encoding, combined */
134};
135
136static int lm78_read_value(struct lm78_data *data, u8 reg);
137static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
138static struct lm78_data *lm78_update_device(struct device *dev);
139static void lm78_init_device(struct lm78_data *data);
140
141/* 7 Voltages */
142static ssize_t in_show(struct device *dev, struct device_attribute *da,
143 char *buf)
144{
145 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
146 struct lm78_data *data = lm78_update_device(dev);
147 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
148}
149
150static ssize_t in_min_show(struct device *dev, struct device_attribute *da,
151 char *buf)
152{
153 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
154 struct lm78_data *data = lm78_update_device(dev);
155 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
156}
157
158static ssize_t in_max_show(struct device *dev, struct device_attribute *da,
159 char *buf)
160{
161 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
162 struct lm78_data *data = lm78_update_device(dev);
163 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
164}
165
166static ssize_t in_min_store(struct device *dev, struct device_attribute *da,
167 const char *buf, size_t count)
168{
169 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
170 struct lm78_data *data = dev_get_drvdata(dev);
171 int nr = attr->index;
172 unsigned long val;
173 int err;
174
175 err = kstrtoul(buf, 10, &val);
176 if (err)
177 return err;
178
179 mutex_lock(&data->update_lock);
180 data->in_min[nr] = IN_TO_REG(val);
181 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
182 mutex_unlock(&data->update_lock);
183 return count;
184}
185
186static ssize_t in_max_store(struct device *dev, struct device_attribute *da,
187 const char *buf, size_t count)
188{
189 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
190 struct lm78_data *data = dev_get_drvdata(dev);
191 int nr = attr->index;
192 unsigned long val;
193 int err;
194
195 err = kstrtoul(buf, 10, &val);
196 if (err)
197 return err;
198
199 mutex_lock(&data->update_lock);
200 data->in_max[nr] = IN_TO_REG(val);
201 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
202 mutex_unlock(&data->update_lock);
203 return count;
204}
205
206static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
207static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
208static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
209static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
210static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
211static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
212static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
213static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
214static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
215static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
216static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
217static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
218static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
219static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
220static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
221static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
222static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
223static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
224static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6);
225static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
226static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
227
228/* Temperature */
229static ssize_t temp1_input_show(struct device *dev,
230 struct device_attribute *da, char *buf)
231{
232 struct lm78_data *data = lm78_update_device(dev);
233 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
234}
235
236static ssize_t temp1_max_show(struct device *dev, struct device_attribute *da,
237 char *buf)
238{
239 struct lm78_data *data = lm78_update_device(dev);
240 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
241}
242
243static ssize_t temp1_max_store(struct device *dev,
244 struct device_attribute *da, const char *buf,
245 size_t count)
246{
247 struct lm78_data *data = dev_get_drvdata(dev);
248 long val;
249 int err;
250
251 err = kstrtol(buf, 10, &val);
252 if (err)
253 return err;
254
255 mutex_lock(&data->update_lock);
256 data->temp_over = TEMP_TO_REG(val);
257 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
258 mutex_unlock(&data->update_lock);
259 return count;
260}
261
262static ssize_t temp1_max_hyst_show(struct device *dev,
263 struct device_attribute *da, char *buf)
264{
265 struct lm78_data *data = lm78_update_device(dev);
266 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
267}
268
269static ssize_t temp1_max_hyst_store(struct device *dev,
270 struct device_attribute *da,
271 const char *buf, size_t count)
272{
273 struct lm78_data *data = dev_get_drvdata(dev);
274 long val;
275 int err;
276
277 err = kstrtol(buf, 10, &val);
278 if (err)
279 return err;
280
281 mutex_lock(&data->update_lock);
282 data->temp_hyst = TEMP_TO_REG(val);
283 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
284 mutex_unlock(&data->update_lock);
285 return count;
286}
287
288static DEVICE_ATTR_RO(temp1_input);
289static DEVICE_ATTR_RW(temp1_max);
290static DEVICE_ATTR_RW(temp1_max_hyst);
291
292/* 3 Fans */
293static ssize_t fan_show(struct device *dev, struct device_attribute *da,
294 char *buf)
295{
296 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
297 struct lm78_data *data = lm78_update_device(dev);
298 int nr = attr->index;
299 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
300 DIV_FROM_REG(data->fan_div[nr])));
301}
302
303static ssize_t fan_min_show(struct device *dev, struct device_attribute *da,
304 char *buf)
305{
306 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
307 struct lm78_data *data = lm78_update_device(dev);
308 int nr = attr->index;
309 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
310 DIV_FROM_REG(data->fan_div[nr])));
311}
312
313static ssize_t fan_min_store(struct device *dev, struct device_attribute *da,
314 const char *buf, size_t count)
315{
316 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
317 struct lm78_data *data = dev_get_drvdata(dev);
318 int nr = attr->index;
319 unsigned long val;
320 int err;
321
322 err = kstrtoul(buf, 10, &val);
323 if (err)
324 return err;
325
326 mutex_lock(&data->update_lock);
327 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
328 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
329 mutex_unlock(&data->update_lock);
330 return count;
331}
332
333static ssize_t fan_div_show(struct device *dev, struct device_attribute *da,
334 char *buf)
335{
336 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
337 struct lm78_data *data = lm78_update_device(dev);
338 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
339}
340
341/*
342 * Note: we save and restore the fan minimum here, because its value is
343 * determined in part by the fan divisor. This follows the principle of
344 * least surprise; the user doesn't expect the fan minimum to change just
345 * because the divisor changed.
346 */
347static ssize_t fan_div_store(struct device *dev, struct device_attribute *da,
348 const char *buf, size_t count)
349{
350 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
351 struct lm78_data *data = dev_get_drvdata(dev);
352 int nr = attr->index;
353 unsigned long min;
354 u8 reg;
355 unsigned long val;
356 int err;
357
358 err = kstrtoul(buf, 10, &val);
359 if (err)
360 return err;
361
362 mutex_lock(&data->update_lock);
363 min = FAN_FROM_REG(data->fan_min[nr],
364 DIV_FROM_REG(data->fan_div[nr]));
365
366 switch (val) {
367 case 1:
368 data->fan_div[nr] = 0;
369 break;
370 case 2:
371 data->fan_div[nr] = 1;
372 break;
373 case 4:
374 data->fan_div[nr] = 2;
375 break;
376 case 8:
377 data->fan_div[nr] = 3;
378 break;
379 default:
380 dev_err(dev,
381 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
382 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
406static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
407static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
408static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
409static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
410static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
411static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
412
413/* Fan 3 divisor is locked in H/W */
414static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
415static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
416static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2);
417
418/* VID */
419static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *da,
420 char *buf)
421{
422 struct lm78_data *data = lm78_update_device(dev);
423 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
424}
425static DEVICE_ATTR_RO(cpu0_vid);
426
427/* Alarms */
428static ssize_t alarms_show(struct device *dev, struct device_attribute *da,
429 char *buf)
430{
431 struct lm78_data *data = lm78_update_device(dev);
432 return sprintf(buf, "%u\n", data->alarms);
433}
434static DEVICE_ATTR_RO(alarms);
435
436static ssize_t alarm_show(struct device *dev, struct device_attribute *da,
437 char *buf)
438{
439 struct lm78_data *data = lm78_update_device(dev);
440 int nr = to_sensor_dev_attr(da)->index;
441 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
442}
443static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
444static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
445static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
446static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
447static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
448static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
449static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10);
450static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
451static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
452static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11);
453static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
454
455static struct attribute *lm78_attrs[] = {
456 &sensor_dev_attr_in0_input.dev_attr.attr,
457 &sensor_dev_attr_in0_min.dev_attr.attr,
458 &sensor_dev_attr_in0_max.dev_attr.attr,
459 &sensor_dev_attr_in0_alarm.dev_attr.attr,
460 &sensor_dev_attr_in1_input.dev_attr.attr,
461 &sensor_dev_attr_in1_min.dev_attr.attr,
462 &sensor_dev_attr_in1_max.dev_attr.attr,
463 &sensor_dev_attr_in1_alarm.dev_attr.attr,
464 &sensor_dev_attr_in2_input.dev_attr.attr,
465 &sensor_dev_attr_in2_min.dev_attr.attr,
466 &sensor_dev_attr_in2_max.dev_attr.attr,
467 &sensor_dev_attr_in2_alarm.dev_attr.attr,
468 &sensor_dev_attr_in3_input.dev_attr.attr,
469 &sensor_dev_attr_in3_min.dev_attr.attr,
470 &sensor_dev_attr_in3_max.dev_attr.attr,
471 &sensor_dev_attr_in3_alarm.dev_attr.attr,
472 &sensor_dev_attr_in4_input.dev_attr.attr,
473 &sensor_dev_attr_in4_min.dev_attr.attr,
474 &sensor_dev_attr_in4_max.dev_attr.attr,
475 &sensor_dev_attr_in4_alarm.dev_attr.attr,
476 &sensor_dev_attr_in5_input.dev_attr.attr,
477 &sensor_dev_attr_in5_min.dev_attr.attr,
478 &sensor_dev_attr_in5_max.dev_attr.attr,
479 &sensor_dev_attr_in5_alarm.dev_attr.attr,
480 &sensor_dev_attr_in6_input.dev_attr.attr,
481 &sensor_dev_attr_in6_min.dev_attr.attr,
482 &sensor_dev_attr_in6_max.dev_attr.attr,
483 &sensor_dev_attr_in6_alarm.dev_attr.attr,
484 &dev_attr_temp1_input.attr,
485 &dev_attr_temp1_max.attr,
486 &dev_attr_temp1_max_hyst.attr,
487 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
488 &sensor_dev_attr_fan1_input.dev_attr.attr,
489 &sensor_dev_attr_fan1_min.dev_attr.attr,
490 &sensor_dev_attr_fan1_div.dev_attr.attr,
491 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
492 &sensor_dev_attr_fan2_input.dev_attr.attr,
493 &sensor_dev_attr_fan2_min.dev_attr.attr,
494 &sensor_dev_attr_fan2_div.dev_attr.attr,
495 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
496 &sensor_dev_attr_fan3_input.dev_attr.attr,
497 &sensor_dev_attr_fan3_min.dev_attr.attr,
498 &sensor_dev_attr_fan3_div.dev_attr.attr,
499 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
500 &dev_attr_alarms.attr,
501 &dev_attr_cpu0_vid.attr,
502
503 NULL
504};
505
506ATTRIBUTE_GROUPS(lm78);
507
508/*
509 * ISA related code
510 */
511#ifdef CONFIG_ISA
512
513/* ISA device, if found */
514static struct platform_device *pdev;
515
516static unsigned short isa_address = 0x290;
517
518static struct lm78_data *lm78_data_if_isa(void)
519{
520 return pdev ? platform_get_drvdata(pdev) : NULL;
521}
522
523/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
524static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
525{
526 struct lm78_data *isa;
527 int i;
528
529 if (!pdev) /* No ISA chip */
530 return 0;
531 isa = platform_get_drvdata(pdev);
532
533 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
534 return 0; /* Address doesn't match */
535 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
536 return 0; /* Chip type doesn't match */
537
538 /*
539 * We compare all the limit registers, the config register and the
540 * interrupt mask registers
541 */
542 for (i = 0x2b; i <= 0x3d; i++) {
543 if (lm78_read_value(isa, i) !=
544 i2c_smbus_read_byte_data(client, i))
545 return 0;
546 }
547 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
548 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
549 return 0;
550 for (i = 0x43; i <= 0x46; i++) {
551 if (lm78_read_value(isa, i) !=
552 i2c_smbus_read_byte_data(client, i))
553 return 0;
554 }
555
556 return 1;
557}
558#else /* !CONFIG_ISA */
559
560static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
561{
562 return 0;
563}
564
565static struct lm78_data *lm78_data_if_isa(void)
566{
567 return NULL;
568}
569#endif /* CONFIG_ISA */
570
571static int lm78_i2c_detect(struct i2c_client *client,
572 struct i2c_board_info *info)
573{
574 int i;
575 struct lm78_data *isa = lm78_data_if_isa();
576 const char *client_name;
577 struct i2c_adapter *adapter = client->adapter;
578 int address = client->addr;
579
580 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
581 return -ENODEV;
582
583 /*
584 * We block updates of the ISA device to minimize the risk of
585 * concurrent access to the same LM78 chip through different
586 * interfaces.
587 */
588 if (isa)
589 mutex_lock(&isa->update_lock);
590
591 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
592 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
593 goto err_nodev;
594
595 /* Explicitly prevent the misdetection of Winbond chips */
596 i = i2c_smbus_read_byte_data(client, 0x4f);
597 if (i == 0xa3 || i == 0x5c)
598 goto err_nodev;
599
600 /* Determine the chip type. */
601 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
602 if (i == 0x00 || i == 0x20 /* LM78 */
603 || i == 0x40) /* LM78-J */
604 client_name = "lm78";
605 else if ((i & 0xfe) == 0xc0)
606 client_name = "lm79";
607 else
608 goto err_nodev;
609
610 if (lm78_alias_detect(client, i)) {
611 dev_dbg(&adapter->dev,
612 "Device at 0x%02x appears to be the same as ISA device\n",
613 address);
614 goto err_nodev;
615 }
616
617 if (isa)
618 mutex_unlock(&isa->update_lock);
619
620 strlcpy(info->type, client_name, I2C_NAME_SIZE);
621
622 return 0;
623
624 err_nodev:
625 if (isa)
626 mutex_unlock(&isa->update_lock);
627 return -ENODEV;
628}
629
630static int lm78_i2c_probe(struct i2c_client *client,
631 const struct i2c_device_id *id)
632{
633 struct device *dev = &client->dev;
634 struct device *hwmon_dev;
635 struct lm78_data *data;
636
637 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
638 if (!data)
639 return -ENOMEM;
640
641 data->client = client;
642 data->type = id->driver_data;
643
644 /* Initialize the LM78 chip */
645 lm78_init_device(data);
646
647 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
648 data, lm78_groups);
649 return PTR_ERR_OR_ZERO(hwmon_dev);
650}
651
652static const struct i2c_device_id lm78_i2c_id[] = {
653 { "lm78", lm78 },
654 { "lm79", lm79 },
655 { }
656};
657MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
658
659static struct i2c_driver lm78_driver = {
660 .class = I2C_CLASS_HWMON,
661 .driver = {
662 .name = "lm78",
663 },
664 .probe = lm78_i2c_probe,
665 .id_table = lm78_i2c_id,
666 .detect = lm78_i2c_detect,
667 .address_list = normal_i2c,
668};
669
670/*
671 * The SMBus locks itself, but ISA access must be locked explicitly!
672 * We don't want to lock the whole ISA bus, so we lock each client
673 * separately.
674 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
675 * would slow down the LM78 access and should not be necessary.
676 */
677static int lm78_read_value(struct lm78_data *data, u8 reg)
678{
679 struct i2c_client *client = data->client;
680
681#ifdef CONFIG_ISA
682 if (!client) { /* ISA device */
683 int res;
684 mutex_lock(&data->lock);
685 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
686 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
687 mutex_unlock(&data->lock);
688 return res;
689 } else
690#endif
691 return i2c_smbus_read_byte_data(client, reg);
692}
693
694static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
695{
696 struct i2c_client *client = data->client;
697
698#ifdef CONFIG_ISA
699 if (!client) { /* ISA device */
700 mutex_lock(&data->lock);
701 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
702 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
703 mutex_unlock(&data->lock);
704 return 0;
705 } else
706#endif
707 return i2c_smbus_write_byte_data(client, reg, value);
708}
709
710static void lm78_init_device(struct lm78_data *data)
711{
712 u8 config;
713 int i;
714
715 /* Start monitoring */
716 config = lm78_read_value(data, LM78_REG_CONFIG);
717 if ((config & 0x09) != 0x01)
718 lm78_write_value(data, LM78_REG_CONFIG,
719 (config & 0xf7) | 0x01);
720
721 /* A few vars need to be filled upon startup */
722 for (i = 0; i < 3; i++) {
723 data->fan_min[i] = lm78_read_value(data,
724 LM78_REG_FAN_MIN(i));
725 }
726
727 mutex_init(&data->update_lock);
728}
729
730static struct lm78_data *lm78_update_device(struct device *dev)
731{
732 struct lm78_data *data = dev_get_drvdata(dev);
733 int i;
734
735 mutex_lock(&data->update_lock);
736
737 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
738 || !data->valid) {
739
740 dev_dbg(dev, "Starting lm78 update\n");
741
742 for (i = 0; i <= 6; i++) {
743 data->in[i] =
744 lm78_read_value(data, LM78_REG_IN(i));
745 data->in_min[i] =
746 lm78_read_value(data, LM78_REG_IN_MIN(i));
747 data->in_max[i] =
748 lm78_read_value(data, LM78_REG_IN_MAX(i));
749 }
750 for (i = 0; i < 3; i++) {
751 data->fan[i] =
752 lm78_read_value(data, LM78_REG_FAN(i));
753 data->fan_min[i] =
754 lm78_read_value(data, LM78_REG_FAN_MIN(i));
755 }
756 data->temp = lm78_read_value(data, LM78_REG_TEMP);
757 data->temp_over =
758 lm78_read_value(data, LM78_REG_TEMP_OVER);
759 data->temp_hyst =
760 lm78_read_value(data, LM78_REG_TEMP_HYST);
761 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
762 data->vid = i & 0x0f;
763 if (data->type == lm79)
764 data->vid |=
765 (lm78_read_value(data, LM78_REG_CHIPID) &
766 0x01) << 4;
767 else
768 data->vid |= 0x10;
769 data->fan_div[0] = (i >> 4) & 0x03;
770 data->fan_div[1] = i >> 6;
771 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
772 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
773 data->last_updated = jiffies;
774 data->valid = 1;
775
776 data->fan_div[2] = 1;
777 }
778
779 mutex_unlock(&data->update_lock);
780
781 return data;
782}
783
784#ifdef CONFIG_ISA
785static int lm78_isa_probe(struct platform_device *pdev)
786{
787 struct device *dev = &pdev->dev;
788 struct device *hwmon_dev;
789 struct lm78_data *data;
790 struct resource *res;
791
792 /* Reserve the ISA region */
793 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
794 if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET,
795 2, "lm78"))
796 return -EBUSY;
797
798 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
799 if (!data)
800 return -ENOMEM;
801
802 mutex_init(&data->lock);
803 data->isa_addr = res->start;
804 platform_set_drvdata(pdev, data);
805
806 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
807 data->type = lm79;
808 data->name = "lm79";
809 } else {
810 data->type = lm78;
811 data->name = "lm78";
812 }
813
814 /* Initialize the LM78 chip */
815 lm78_init_device(data);
816
817 hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
818 data, lm78_groups);
819 return PTR_ERR_OR_ZERO(hwmon_dev);
820}
821
822static struct platform_driver lm78_isa_driver = {
823 .driver = {
824 .name = "lm78",
825 },
826 .probe = lm78_isa_probe,
827};
828
829/* return 1 if a supported chip is found, 0 otherwise */
830static int __init lm78_isa_found(unsigned short address)
831{
832 int val, save, found = 0;
833 int port;
834
835 /*
836 * Some boards declare base+0 to base+7 as a PNP device, some base+4
837 * to base+7 and some base+5 to base+6. So we better request each port
838 * individually for the probing phase.
839 */
840 for (port = address; port < address + LM78_EXTENT; port++) {
841 if (!request_region(port, 1, "lm78")) {
842 pr_debug("Failed to request port 0x%x\n", port);
843 goto release;
844 }
845 }
846
847#define REALLY_SLOW_IO
848 /*
849 * We need the timeouts for at least some LM78-like
850 * chips. But only if we read 'undefined' registers.
851 */
852 val = inb_p(address + 1);
853 if (inb_p(address + 2) != val
854 || inb_p(address + 3) != val
855 || inb_p(address + 7) != val)
856 goto release;
857#undef REALLY_SLOW_IO
858
859 /*
860 * We should be able to change the 7 LSB of the address port. The
861 * MSB (busy flag) should be clear initially, set after the write.
862 */
863 save = inb_p(address + LM78_ADDR_REG_OFFSET);
864 if (save & 0x80)
865 goto release;
866 val = ~save & 0x7f;
867 outb_p(val, address + LM78_ADDR_REG_OFFSET);
868 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
869 outb_p(save, address + LM78_ADDR_REG_OFFSET);
870 goto release;
871 }
872
873 /* We found a device, now see if it could be an LM78 */
874 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
875 val = inb_p(address + LM78_DATA_REG_OFFSET);
876 if (val & 0x80)
877 goto release;
878 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
879 val = inb_p(address + LM78_DATA_REG_OFFSET);
880 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
881 goto release;
882
883 /* The busy flag should be clear again */
884 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
885 goto release;
886
887 /* Explicitly prevent the misdetection of Winbond chips */
888 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
889 val = inb_p(address + LM78_DATA_REG_OFFSET);
890 if (val == 0xa3 || val == 0x5c)
891 goto release;
892
893 /* Explicitly prevent the misdetection of ITE chips */
894 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
895 val = inb_p(address + LM78_DATA_REG_OFFSET);
896 if (val == 0x90)
897 goto release;
898
899 /* Determine the chip type */
900 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
901 val = inb_p(address + LM78_DATA_REG_OFFSET);
902 if (val == 0x00 || val == 0x20 /* LM78 */
903 || val == 0x40 /* LM78-J */
904 || (val & 0xfe) == 0xc0) /* LM79 */
905 found = 1;
906
907 if (found)
908 pr_info("Found an %s chip at %#x\n",
909 val & 0x80 ? "LM79" : "LM78", (int)address);
910
911 release:
912 for (port--; port >= address; port--)
913 release_region(port, 1);
914 return found;
915}
916
917static int __init lm78_isa_device_add(unsigned short address)
918{
919 struct resource res = {
920 .start = address,
921 .end = address + LM78_EXTENT - 1,
922 .name = "lm78",
923 .flags = IORESOURCE_IO,
924 };
925 int err;
926
927 pdev = platform_device_alloc("lm78", address);
928 if (!pdev) {
929 err = -ENOMEM;
930 pr_err("Device allocation failed\n");
931 goto exit;
932 }
933
934 err = platform_device_add_resources(pdev, &res, 1);
935 if (err) {
936 pr_err("Device resource addition failed (%d)\n", err);
937 goto exit_device_put;
938 }
939
940 err = platform_device_add(pdev);
941 if (err) {
942 pr_err("Device addition failed (%d)\n", err);
943 goto exit_device_put;
944 }
945
946 return 0;
947
948 exit_device_put:
949 platform_device_put(pdev);
950 exit:
951 pdev = NULL;
952 return err;
953}
954
955static int __init lm78_isa_register(void)
956{
957 int res;
958
959 if (lm78_isa_found(isa_address)) {
960 res = platform_driver_register(&lm78_isa_driver);
961 if (res)
962 goto exit;
963
964 /* Sets global pdev as a side effect */
965 res = lm78_isa_device_add(isa_address);
966 if (res)
967 goto exit_unreg_isa_driver;
968 }
969
970 return 0;
971
972 exit_unreg_isa_driver:
973 platform_driver_unregister(&lm78_isa_driver);
974 exit:
975 return res;
976}
977
978static void lm78_isa_unregister(void)
979{
980 if (pdev) {
981 platform_device_unregister(pdev);
982 platform_driver_unregister(&lm78_isa_driver);
983 }
984}
985#else /* !CONFIG_ISA */
986
987static int __init lm78_isa_register(void)
988{
989 return 0;
990}
991
992static void lm78_isa_unregister(void)
993{
994}
995#endif /* CONFIG_ISA */
996
997static int __init sm_lm78_init(void)
998{
999 int res;
1000
1001 /*
1002 * We register the ISA device first, so that we can skip the
1003 * registration of an I2C interface to the same device.
1004 */
1005 res = lm78_isa_register();
1006 if (res)
1007 goto exit;
1008
1009 res = i2c_add_driver(&lm78_driver);
1010 if (res)
1011 goto exit_unreg_isa_device;
1012
1013 return 0;
1014
1015 exit_unreg_isa_device:
1016 lm78_isa_unregister();
1017 exit:
1018 return res;
1019}
1020
1021static void __exit sm_lm78_exit(void)
1022{
1023 lm78_isa_unregister();
1024 i2c_del_driver(&lm78_driver);
1025}
1026
1027MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>");
1028MODULE_DESCRIPTION("LM78/LM79 driver");
1029MODULE_LICENSE("GPL");
1030
1031module_init(sm_lm78_init);
1032module_exit(sm_lm78_exit);
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 */
42static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
43 0x2e, 0x2f, I2C_CLIENT_END };
44enum 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 */
86static 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
93static 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
100static 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 */
109static 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
115static inline int TEMP_FROM_REG(s8 val)
116{
117 return val * 1000;
118}
119
120#define DIV_FROM_REG(val) (1 << (val))
121
122struct 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
150static int lm78_read_value(struct lm78_data *data, u8 reg);
151static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
152static struct lm78_data *lm78_update_device(struct device *dev);
153static void lm78_init_device(struct lm78_data *data);
154
155
156/* 7 Voltages */
157static 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
165static 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
173static 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
181static 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
201static 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) \
222static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
223 show_in, NULL, offset); \
224static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
225 show_in_min, set_in_min, offset); \
226static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
227 show_in_max, set_in_max, offset);
228
229show_in_offset(0);
230show_in_offset(1);
231show_in_offset(2);
232show_in_offset(3);
233show_in_offset(4);
234show_in_offset(5);
235show_in_offset(6);
236
237/* Temperature */
238static 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
245static 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
252static 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
270static 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
277static 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
295static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
296static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
297 show_temp_over, set_temp_over);
298static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
299 show_temp_hyst, set_temp_hyst);
300
301/* 3 Fans */
302static 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
312static 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
322static 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
342static 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 */
356static 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) \
415static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
416 show_fan, NULL, offset - 1); \
417static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
418 show_fan_min, set_fan_min, offset - 1);
419
420show_fan_offset(1);
421show_fan_offset(2);
422show_fan_offset(3);
423
424/* Fan 3 divisor is locked in H/W */
425static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
426 show_fan_div, set_fan_div, 0);
427static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
428 show_fan_div, set_fan_div, 1);
429static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
430
431/* VID */
432static 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}
438static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
439
440/* Alarms */
441static 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}
447static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
448
449static 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}
456static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
457static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
458static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
459static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
460static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
461static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
462static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
463static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
464static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
465static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
466static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
467
468static 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
519static 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 */
529static struct platform_device *pdev;
530
531static 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 */
537static 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}
544static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
545
546static 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 */
552static 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
588static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
589{
590 return 0;
591}
592
593static struct lm78_data *lm78_data_if_isa(void)
594{
595 return NULL;
596}
597#endif /* CONFIG_ISA */
598
599static 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
657static 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
687ERROR4:
688 sysfs_remove_group(&client->dev.kobj, &lm78_group);
689ERROR3:
690 kfree(data);
691 return err;
692}
693
694static 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
705static const struct i2c_device_id lm78_i2c_id[] = {
706 { "lm78", lm78 },
707 { "lm79", lm79 },
708 { }
709};
710MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
711
712static 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 */
731static 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
748static 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
764static 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
784static 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
839static 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
898static 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
914static 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 */
924static 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
1011static 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
1049static 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
1072static 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
1081static int __init lm78_isa_register(void)
1082{
1083 return 0;
1084}
1085
1086static void lm78_isa_unregister(void)
1087{
1088}
1089#endif /* CONFIG_ISA */
1090
1091static 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
1115static void __exit sm_lm78_exit(void)
1116{
1117 lm78_isa_unregister();
1118 i2c_del_driver(&lm78_driver);
1119}
1120
1121MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>");
1122MODULE_DESCRIPTION("LM78/LM79 driver");
1123MODULE_LICENSE("GPL");
1124
1125module_init(sm_lm78_init);
1126module_exit(sm_lm78_exit);