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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 bool valid; /* true 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 strscpy(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{
632 struct device *dev = &client->dev;
633 struct device *hwmon_dev;
634 struct lm78_data *data;
635
636 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
637 if (!data)
638 return -ENOMEM;
639
640 data->client = client;
641 data->type = (uintptr_t)i2c_get_match_data(client);
642
643 /* Initialize the LM78 chip */
644 lm78_init_device(data);
645
646 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
647 data, lm78_groups);
648 return PTR_ERR_OR_ZERO(hwmon_dev);
649}
650
651static const struct i2c_device_id lm78_i2c_id[] = {
652 { "lm78", lm78 },
653 { "lm79", lm79 },
654 { }
655};
656MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
657
658static struct i2c_driver lm78_driver = {
659 .class = I2C_CLASS_HWMON,
660 .driver = {
661 .name = "lm78",
662 },
663 .probe = lm78_i2c_probe,
664 .id_table = lm78_i2c_id,
665 .detect = lm78_i2c_detect,
666 .address_list = normal_i2c,
667};
668
669/*
670 * The SMBus locks itself, but ISA access must be locked explicitly!
671 * We don't want to lock the whole ISA bus, so we lock each client
672 * separately.
673 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
674 * would slow down the LM78 access and should not be necessary.
675 */
676static int lm78_read_value(struct lm78_data *data, u8 reg)
677{
678 struct i2c_client *client = data->client;
679
680#ifdef CONFIG_ISA
681 if (!client) { /* ISA device */
682 int res;
683 mutex_lock(&data->lock);
684 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
685 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
686 mutex_unlock(&data->lock);
687 return res;
688 } else
689#endif
690 return i2c_smbus_read_byte_data(client, reg);
691}
692
693static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
694{
695 struct i2c_client *client = data->client;
696
697#ifdef CONFIG_ISA
698 if (!client) { /* ISA device */
699 mutex_lock(&data->lock);
700 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
701 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
702 mutex_unlock(&data->lock);
703 return 0;
704 } else
705#endif
706 return i2c_smbus_write_byte_data(client, reg, value);
707}
708
709static void lm78_init_device(struct lm78_data *data)
710{
711 u8 config;
712 int i;
713
714 /* Start monitoring */
715 config = lm78_read_value(data, LM78_REG_CONFIG);
716 if ((config & 0x09) != 0x01)
717 lm78_write_value(data, LM78_REG_CONFIG,
718 (config & 0xf7) | 0x01);
719
720 /* A few vars need to be filled upon startup */
721 for (i = 0; i < 3; i++) {
722 data->fan_min[i] = lm78_read_value(data,
723 LM78_REG_FAN_MIN(i));
724 }
725
726 mutex_init(&data->update_lock);
727}
728
729static struct lm78_data *lm78_update_device(struct device *dev)
730{
731 struct lm78_data *data = dev_get_drvdata(dev);
732 int i;
733
734 mutex_lock(&data->update_lock);
735
736 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
737 || !data->valid) {
738
739 dev_dbg(dev, "Starting lm78 update\n");
740
741 for (i = 0; i <= 6; i++) {
742 data->in[i] =
743 lm78_read_value(data, LM78_REG_IN(i));
744 data->in_min[i] =
745 lm78_read_value(data, LM78_REG_IN_MIN(i));
746 data->in_max[i] =
747 lm78_read_value(data, LM78_REG_IN_MAX(i));
748 }
749 for (i = 0; i < 3; i++) {
750 data->fan[i] =
751 lm78_read_value(data, LM78_REG_FAN(i));
752 data->fan_min[i] =
753 lm78_read_value(data, LM78_REG_FAN_MIN(i));
754 }
755 data->temp = lm78_read_value(data, LM78_REG_TEMP);
756 data->temp_over =
757 lm78_read_value(data, LM78_REG_TEMP_OVER);
758 data->temp_hyst =
759 lm78_read_value(data, LM78_REG_TEMP_HYST);
760 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
761 data->vid = i & 0x0f;
762 if (data->type == lm79)
763 data->vid |=
764 (lm78_read_value(data, LM78_REG_CHIPID) &
765 0x01) << 4;
766 else
767 data->vid |= 0x10;
768 data->fan_div[0] = (i >> 4) & 0x03;
769 data->fan_div[1] = i >> 6;
770 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
771 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
772 data->last_updated = jiffies;
773 data->valid = true;
774
775 data->fan_div[2] = 1;
776 }
777
778 mutex_unlock(&data->update_lock);
779
780 return data;
781}
782
783#ifdef CONFIG_ISA
784static int lm78_isa_probe(struct platform_device *pdev)
785{
786 struct device *dev = &pdev->dev;
787 struct device *hwmon_dev;
788 struct lm78_data *data;
789 struct resource *res;
790
791 /* Reserve the ISA region */
792 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
793 if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET,
794 2, "lm78"))
795 return -EBUSY;
796
797 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
798 if (!data)
799 return -ENOMEM;
800
801 mutex_init(&data->lock);
802 data->isa_addr = res->start;
803 platform_set_drvdata(pdev, data);
804
805 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
806 data->type = lm79;
807 data->name = "lm79";
808 } else {
809 data->type = lm78;
810 data->name = "lm78";
811 }
812
813 /* Initialize the LM78 chip */
814 lm78_init_device(data);
815
816 hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
817 data, lm78_groups);
818 return PTR_ERR_OR_ZERO(hwmon_dev);
819}
820
821static struct platform_driver lm78_isa_driver = {
822 .driver = {
823 .name = "lm78",
824 },
825 .probe = lm78_isa_probe,
826};
827
828/* return 1 if a supported chip is found, 0 otherwise */
829static int __init lm78_isa_found(unsigned short address)
830{
831 int val, save, found = 0;
832 int port;
833
834 /*
835 * Some boards declare base+0 to base+7 as a PNP device, some base+4
836 * to base+7 and some base+5 to base+6. So we better request each port
837 * individually for the probing phase.
838 */
839 for (port = address; port < address + LM78_EXTENT; port++) {
840 if (!request_region(port, 1, "lm78")) {
841 pr_debug("Failed to request port 0x%x\n", port);
842 goto release;
843 }
844 }
845
846#define REALLY_SLOW_IO
847 /*
848 * We need the timeouts for at least some LM78-like
849 * chips. But only if we read 'undefined' registers.
850 */
851 val = inb_p(address + 1);
852 if (inb_p(address + 2) != val
853 || inb_p(address + 3) != val
854 || inb_p(address + 7) != val)
855 goto release;
856#undef REALLY_SLOW_IO
857
858 /*
859 * We should be able to change the 7 LSB of the address port. The
860 * MSB (busy flag) should be clear initially, set after the write.
861 */
862 save = inb_p(address + LM78_ADDR_REG_OFFSET);
863 if (save & 0x80)
864 goto release;
865 val = ~save & 0x7f;
866 outb_p(val, address + LM78_ADDR_REG_OFFSET);
867 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
868 outb_p(save, address + LM78_ADDR_REG_OFFSET);
869 goto release;
870 }
871
872 /* We found a device, now see if it could be an LM78 */
873 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
874 val = inb_p(address + LM78_DATA_REG_OFFSET);
875 if (val & 0x80)
876 goto release;
877 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
878 val = inb_p(address + LM78_DATA_REG_OFFSET);
879 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
880 goto release;
881
882 /* The busy flag should be clear again */
883 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
884 goto release;
885
886 /* Explicitly prevent the misdetection of Winbond chips */
887 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
888 val = inb_p(address + LM78_DATA_REG_OFFSET);
889 if (val == 0xa3 || val == 0x5c)
890 goto release;
891
892 /* Explicitly prevent the misdetection of ITE chips */
893 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
894 val = inb_p(address + LM78_DATA_REG_OFFSET);
895 if (val == 0x90)
896 goto release;
897
898 /* Determine the chip type */
899 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
900 val = inb_p(address + LM78_DATA_REG_OFFSET);
901 if (val == 0x00 || val == 0x20 /* LM78 */
902 || val == 0x40 /* LM78-J */
903 || (val & 0xfe) == 0xc0) /* LM79 */
904 found = 1;
905
906 if (found)
907 pr_info("Found an %s chip at %#x\n",
908 val & 0x80 ? "LM79" : "LM78", (int)address);
909
910 release:
911 for (port--; port >= address; port--)
912 release_region(port, 1);
913 return found;
914}
915
916static int __init lm78_isa_device_add(unsigned short address)
917{
918 struct resource res = {
919 .start = address,
920 .end = address + LM78_EXTENT - 1,
921 .name = "lm78",
922 .flags = IORESOURCE_IO,
923 };
924 int err;
925
926 pdev = platform_device_alloc("lm78", address);
927 if (!pdev) {
928 err = -ENOMEM;
929 pr_err("Device allocation failed\n");
930 goto exit;
931 }
932
933 err = platform_device_add_resources(pdev, &res, 1);
934 if (err) {
935 pr_err("Device resource addition failed (%d)\n", err);
936 goto exit_device_put;
937 }
938
939 err = platform_device_add(pdev);
940 if (err) {
941 pr_err("Device addition failed (%d)\n", err);
942 goto exit_device_put;
943 }
944
945 return 0;
946
947 exit_device_put:
948 platform_device_put(pdev);
949 exit:
950 pdev = NULL;
951 return err;
952}
953
954static int __init lm78_isa_register(void)
955{
956 int res;
957
958 if (lm78_isa_found(isa_address)) {
959 res = platform_driver_register(&lm78_isa_driver);
960 if (res)
961 goto exit;
962
963 /* Sets global pdev as a side effect */
964 res = lm78_isa_device_add(isa_address);
965 if (res)
966 goto exit_unreg_isa_driver;
967 }
968
969 return 0;
970
971 exit_unreg_isa_driver:
972 platform_driver_unregister(&lm78_isa_driver);
973 exit:
974 return res;
975}
976
977static void lm78_isa_unregister(void)
978{
979 if (pdev) {
980 platform_device_unregister(pdev);
981 platform_driver_unregister(&lm78_isa_driver);
982 }
983}
984#else /* !CONFIG_ISA */
985
986static int __init lm78_isa_register(void)
987{
988 return 0;
989}
990
991static void lm78_isa_unregister(void)
992{
993}
994#endif /* CONFIG_ISA */
995
996static int __init sm_lm78_init(void)
997{
998 int res;
999
1000 /*
1001 * We register the ISA device first, so that we can skip the
1002 * registration of an I2C interface to the same device.
1003 */
1004 res = lm78_isa_register();
1005 if (res)
1006 goto exit;
1007
1008 res = i2c_add_driver(&lm78_driver);
1009 if (res)
1010 goto exit_unreg_isa_device;
1011
1012 return 0;
1013
1014 exit_unreg_isa_device:
1015 lm78_isa_unregister();
1016 exit:
1017 return res;
1018}
1019
1020static void __exit sm_lm78_exit(void)
1021{
1022 lm78_isa_unregister();
1023 i2c_del_driver(&lm78_driver);
1024}
1025
1026MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>");
1027MODULE_DESCRIPTION("LM78/LM79 driver");
1028MODULE_LICENSE("GPL");
1029
1030module_init(sm_lm78_init);
1031module_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 <jdelvare@suse.de>
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 = clamp_val(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 if (rpm > 1350000)
98 return 1;
99 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
100}
101
102static inline int FAN_FROM_REG(u8 val, int div)
103{
104 return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
105}
106
107/*
108 * TEMP: mC (-128C to +127C)
109 * REG: 1C/bit, two's complement
110 */
111static inline s8 TEMP_TO_REG(int val)
112{
113 int nval = clamp_val(val, -128000, 127000) ;
114 return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
115}
116
117static inline int TEMP_FROM_REG(s8 val)
118{
119 return val * 1000;
120}
121
122#define DIV_FROM_REG(val) (1 << (val))
123
124struct lm78_data {
125 struct i2c_client *client;
126 struct device *hwmon_dev;
127 struct mutex lock;
128 enum chips type;
129
130 /* For ISA device only */
131 const char *name;
132 int isa_addr;
133
134 struct mutex update_lock;
135 char valid; /* !=0 if following fields are valid */
136 unsigned long last_updated; /* In jiffies */
137
138 u8 in[7]; /* Register value */
139 u8 in_max[7]; /* Register value */
140 u8 in_min[7]; /* Register value */
141 u8 fan[3]; /* Register value */
142 u8 fan_min[3]; /* Register value */
143 s8 temp; /* Register value */
144 s8 temp_over; /* Register value */
145 s8 temp_hyst; /* Register value */
146 u8 fan_div[3]; /* Register encoding, shifted right */
147 u8 vid; /* Register encoding, combined */
148 u16 alarms; /* Register encoding, combined */
149};
150
151
152static int lm78_read_value(struct lm78_data *data, u8 reg);
153static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
154static struct lm78_data *lm78_update_device(struct device *dev);
155static void lm78_init_device(struct lm78_data *data);
156
157
158/* 7 Voltages */
159static ssize_t show_in(struct device *dev, struct device_attribute *da,
160 char *buf)
161{
162 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
163 struct lm78_data *data = lm78_update_device(dev);
164 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
165}
166
167static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
168 char *buf)
169{
170 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
171 struct lm78_data *data = lm78_update_device(dev);
172 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
173}
174
175static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
176 char *buf)
177{
178 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
179 struct lm78_data *data = lm78_update_device(dev);
180 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
181}
182
183static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
184 const char *buf, size_t count)
185{
186 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
187 struct lm78_data *data = dev_get_drvdata(dev);
188 int nr = attr->index;
189 unsigned long val;
190 int err;
191
192 err = kstrtoul(buf, 10, &val);
193 if (err)
194 return err;
195
196 mutex_lock(&data->update_lock);
197 data->in_min[nr] = IN_TO_REG(val);
198 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
199 mutex_unlock(&data->update_lock);
200 return count;
201}
202
203static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
204 const char *buf, size_t count)
205{
206 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
207 struct lm78_data *data = dev_get_drvdata(dev);
208 int nr = attr->index;
209 unsigned long val;
210 int err;
211
212 err = kstrtoul(buf, 10, &val);
213 if (err)
214 return err;
215
216 mutex_lock(&data->update_lock);
217 data->in_max[nr] = IN_TO_REG(val);
218 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
219 mutex_unlock(&data->update_lock);
220 return count;
221}
222
223#define show_in_offset(offset) \
224static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
225 show_in, NULL, offset); \
226static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
227 show_in_min, set_in_min, offset); \
228static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
229 show_in_max, set_in_max, offset);
230
231show_in_offset(0);
232show_in_offset(1);
233show_in_offset(2);
234show_in_offset(3);
235show_in_offset(4);
236show_in_offset(5);
237show_in_offset(6);
238
239/* Temperature */
240static ssize_t show_temp(struct device *dev, struct device_attribute *da,
241 char *buf)
242{
243 struct lm78_data *data = lm78_update_device(dev);
244 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
245}
246
247static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
248 char *buf)
249{
250 struct lm78_data *data = lm78_update_device(dev);
251 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
252}
253
254static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
255 const char *buf, size_t count)
256{
257 struct lm78_data *data = dev_get_drvdata(dev);
258 long val;
259 int err;
260
261 err = kstrtol(buf, 10, &val);
262 if (err)
263 return err;
264
265 mutex_lock(&data->update_lock);
266 data->temp_over = TEMP_TO_REG(val);
267 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
268 mutex_unlock(&data->update_lock);
269 return count;
270}
271
272static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
273 char *buf)
274{
275 struct lm78_data *data = lm78_update_device(dev);
276 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
277}
278
279static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
280 const char *buf, size_t count)
281{
282 struct lm78_data *data = dev_get_drvdata(dev);
283 long val;
284 int err;
285
286 err = kstrtol(buf, 10, &val);
287 if (err)
288 return err;
289
290 mutex_lock(&data->update_lock);
291 data->temp_hyst = TEMP_TO_REG(val);
292 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
293 mutex_unlock(&data->update_lock);
294 return count;
295}
296
297static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
298static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
299 show_temp_over, set_temp_over);
300static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
301 show_temp_hyst, set_temp_hyst);
302
303/* 3 Fans */
304static ssize_t show_fan(struct device *dev, struct device_attribute *da,
305 char *buf)
306{
307 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
308 struct lm78_data *data = lm78_update_device(dev);
309 int nr = attr->index;
310 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
311 DIV_FROM_REG(data->fan_div[nr])));
312}
313
314static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
315 char *buf)
316{
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
318 struct lm78_data *data = lm78_update_device(dev);
319 int nr = attr->index;
320 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
321 DIV_FROM_REG(data->fan_div[nr])));
322}
323
324static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
325 const char *buf, size_t count)
326{
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
328 struct lm78_data *data = dev_get_drvdata(dev);
329 int nr = attr->index;
330 unsigned long val;
331 int err;
332
333 err = kstrtoul(buf, 10, &val);
334 if (err)
335 return err;
336
337 mutex_lock(&data->update_lock);
338 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
339 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
340 mutex_unlock(&data->update_lock);
341 return count;
342}
343
344static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
345 char *buf)
346{
347 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
348 struct lm78_data *data = lm78_update_device(dev);
349 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
350}
351
352/*
353 * Note: we save and restore the fan minimum here, because its value is
354 * determined in part by the fan divisor. This follows the principle of
355 * least surprise; the user doesn't expect the fan minimum to change just
356 * because the divisor changed.
357 */
358static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
359 const char *buf, size_t count)
360{
361 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
362 struct lm78_data *data = dev_get_drvdata(dev);
363 int nr = attr->index;
364 unsigned long min;
365 u8 reg;
366 unsigned long val;
367 int err;
368
369 err = kstrtoul(buf, 10, &val);
370 if (err)
371 return err;
372
373 mutex_lock(&data->update_lock);
374 min = FAN_FROM_REG(data->fan_min[nr],
375 DIV_FROM_REG(data->fan_div[nr]));
376
377 switch (val) {
378 case 1:
379 data->fan_div[nr] = 0;
380 break;
381 case 2:
382 data->fan_div[nr] = 1;
383 break;
384 case 4:
385 data->fan_div[nr] = 2;
386 break;
387 case 8:
388 data->fan_div[nr] = 3;
389 break;
390 default:
391 dev_err(dev,
392 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
393 val);
394 mutex_unlock(&data->update_lock);
395 return -EINVAL;
396 }
397
398 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
399 switch (nr) {
400 case 0:
401 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
402 break;
403 case 1:
404 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
405 break;
406 }
407 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
408
409 data->fan_min[nr] =
410 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
411 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
412 mutex_unlock(&data->update_lock);
413
414 return count;
415}
416
417#define show_fan_offset(offset) \
418static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
419 show_fan, NULL, offset - 1); \
420static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
421 show_fan_min, set_fan_min, offset - 1);
422
423show_fan_offset(1);
424show_fan_offset(2);
425show_fan_offset(3);
426
427/* Fan 3 divisor is locked in H/W */
428static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
429 show_fan_div, set_fan_div, 0);
430static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
431 show_fan_div, set_fan_div, 1);
432static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
433
434/* VID */
435static ssize_t show_vid(struct device *dev, struct device_attribute *da,
436 char *buf)
437{
438 struct lm78_data *data = lm78_update_device(dev);
439 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
440}
441static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
442
443/* Alarms */
444static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
445 char *buf)
446{
447 struct lm78_data *data = lm78_update_device(dev);
448 return sprintf(buf, "%u\n", data->alarms);
449}
450static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
451
452static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
453 char *buf)
454{
455 struct lm78_data *data = lm78_update_device(dev);
456 int nr = to_sensor_dev_attr(da)->index;
457 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
458}
459static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
460static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
461static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
462static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
463static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
464static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
465static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
466static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
467static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
468static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
469static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
470
471static struct attribute *lm78_attributes[] = {
472 &sensor_dev_attr_in0_input.dev_attr.attr,
473 &sensor_dev_attr_in0_min.dev_attr.attr,
474 &sensor_dev_attr_in0_max.dev_attr.attr,
475 &sensor_dev_attr_in0_alarm.dev_attr.attr,
476 &sensor_dev_attr_in1_input.dev_attr.attr,
477 &sensor_dev_attr_in1_min.dev_attr.attr,
478 &sensor_dev_attr_in1_max.dev_attr.attr,
479 &sensor_dev_attr_in1_alarm.dev_attr.attr,
480 &sensor_dev_attr_in2_input.dev_attr.attr,
481 &sensor_dev_attr_in2_min.dev_attr.attr,
482 &sensor_dev_attr_in2_max.dev_attr.attr,
483 &sensor_dev_attr_in2_alarm.dev_attr.attr,
484 &sensor_dev_attr_in3_input.dev_attr.attr,
485 &sensor_dev_attr_in3_min.dev_attr.attr,
486 &sensor_dev_attr_in3_max.dev_attr.attr,
487 &sensor_dev_attr_in3_alarm.dev_attr.attr,
488 &sensor_dev_attr_in4_input.dev_attr.attr,
489 &sensor_dev_attr_in4_min.dev_attr.attr,
490 &sensor_dev_attr_in4_max.dev_attr.attr,
491 &sensor_dev_attr_in4_alarm.dev_attr.attr,
492 &sensor_dev_attr_in5_input.dev_attr.attr,
493 &sensor_dev_attr_in5_min.dev_attr.attr,
494 &sensor_dev_attr_in5_max.dev_attr.attr,
495 &sensor_dev_attr_in5_alarm.dev_attr.attr,
496 &sensor_dev_attr_in6_input.dev_attr.attr,
497 &sensor_dev_attr_in6_min.dev_attr.attr,
498 &sensor_dev_attr_in6_max.dev_attr.attr,
499 &sensor_dev_attr_in6_alarm.dev_attr.attr,
500 &dev_attr_temp1_input.attr,
501 &dev_attr_temp1_max.attr,
502 &dev_attr_temp1_max_hyst.attr,
503 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
504 &sensor_dev_attr_fan1_input.dev_attr.attr,
505 &sensor_dev_attr_fan1_min.dev_attr.attr,
506 &sensor_dev_attr_fan1_div.dev_attr.attr,
507 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
508 &sensor_dev_attr_fan2_input.dev_attr.attr,
509 &sensor_dev_attr_fan2_min.dev_attr.attr,
510 &sensor_dev_attr_fan2_div.dev_attr.attr,
511 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
512 &sensor_dev_attr_fan3_input.dev_attr.attr,
513 &sensor_dev_attr_fan3_min.dev_attr.attr,
514 &sensor_dev_attr_fan3_div.dev_attr.attr,
515 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
516 &dev_attr_alarms.attr,
517 &dev_attr_cpu0_vid.attr,
518
519 NULL
520};
521
522static const struct attribute_group lm78_group = {
523 .attrs = lm78_attributes,
524};
525
526/*
527 * ISA related code
528 */
529#ifdef CONFIG_ISA
530
531/* ISA device, if found */
532static struct platform_device *pdev;
533
534static unsigned short isa_address = 0x290;
535
536/*
537 * I2C devices get this name attribute automatically, but for ISA devices
538 * we must create it by ourselves.
539 */
540static ssize_t show_name(struct device *dev, struct device_attribute
541 *devattr, char *buf)
542{
543 struct lm78_data *data = dev_get_drvdata(dev);
544
545 return sprintf(buf, "%s\n", data->name);
546}
547static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
548
549static struct lm78_data *lm78_data_if_isa(void)
550{
551 return pdev ? platform_get_drvdata(pdev) : NULL;
552}
553
554/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
555static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
556{
557 struct lm78_data *isa;
558 int i;
559
560 if (!pdev) /* No ISA chip */
561 return 0;
562 isa = platform_get_drvdata(pdev);
563
564 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
565 return 0; /* Address doesn't match */
566 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
567 return 0; /* Chip type doesn't match */
568
569 /*
570 * We compare all the limit registers, the config register and the
571 * interrupt mask registers
572 */
573 for (i = 0x2b; i <= 0x3d; i++) {
574 if (lm78_read_value(isa, i) !=
575 i2c_smbus_read_byte_data(client, i))
576 return 0;
577 }
578 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
579 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
580 return 0;
581 for (i = 0x43; i <= 0x46; i++) {
582 if (lm78_read_value(isa, i) !=
583 i2c_smbus_read_byte_data(client, i))
584 return 0;
585 }
586
587 return 1;
588}
589#else /* !CONFIG_ISA */
590
591static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
592{
593 return 0;
594}
595
596static struct lm78_data *lm78_data_if_isa(void)
597{
598 return NULL;
599}
600#endif /* CONFIG_ISA */
601
602static int lm78_i2c_detect(struct i2c_client *client,
603 struct i2c_board_info *info)
604{
605 int i;
606 struct lm78_data *isa = lm78_data_if_isa();
607 const char *client_name;
608 struct i2c_adapter *adapter = client->adapter;
609 int address = client->addr;
610
611 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
612 return -ENODEV;
613
614 /*
615 * We block updates of the ISA device to minimize the risk of
616 * concurrent access to the same LM78 chip through different
617 * interfaces.
618 */
619 if (isa)
620 mutex_lock(&isa->update_lock);
621
622 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
623 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
624 goto err_nodev;
625
626 /* Explicitly prevent the misdetection of Winbond chips */
627 i = i2c_smbus_read_byte_data(client, 0x4f);
628 if (i == 0xa3 || i == 0x5c)
629 goto err_nodev;
630
631 /* Determine the chip type. */
632 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
633 if (i == 0x00 || i == 0x20 /* LM78 */
634 || i == 0x40) /* LM78-J */
635 client_name = "lm78";
636 else if ((i & 0xfe) == 0xc0)
637 client_name = "lm79";
638 else
639 goto err_nodev;
640
641 if (lm78_alias_detect(client, i)) {
642 dev_dbg(&adapter->dev,
643 "Device at 0x%02x appears to be the same as ISA device\n",
644 address);
645 goto err_nodev;
646 }
647
648 if (isa)
649 mutex_unlock(&isa->update_lock);
650
651 strlcpy(info->type, client_name, I2C_NAME_SIZE);
652
653 return 0;
654
655 err_nodev:
656 if (isa)
657 mutex_unlock(&isa->update_lock);
658 return -ENODEV;
659}
660
661static int lm78_i2c_probe(struct i2c_client *client,
662 const struct i2c_device_id *id)
663{
664 struct lm78_data *data;
665 int err;
666
667 data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL);
668 if (!data)
669 return -ENOMEM;
670
671 i2c_set_clientdata(client, data);
672 data->client = client;
673 data->type = id->driver_data;
674
675 /* Initialize the LM78 chip */
676 lm78_init_device(data);
677
678 /* Register sysfs hooks */
679 err = sysfs_create_group(&client->dev.kobj, &lm78_group);
680 if (err)
681 return err;
682
683 data->hwmon_dev = hwmon_device_register(&client->dev);
684 if (IS_ERR(data->hwmon_dev)) {
685 err = PTR_ERR(data->hwmon_dev);
686 goto error;
687 }
688
689 return 0;
690
691error:
692 sysfs_remove_group(&client->dev.kobj, &lm78_group);
693 return err;
694}
695
696static int lm78_i2c_remove(struct i2c_client *client)
697{
698 struct lm78_data *data = i2c_get_clientdata(client);
699
700 hwmon_device_unregister(data->hwmon_dev);
701 sysfs_remove_group(&client->dev.kobj, &lm78_group);
702
703 return 0;
704}
705
706static const struct i2c_device_id lm78_i2c_id[] = {
707 { "lm78", lm78 },
708 { "lm79", lm79 },
709 { }
710};
711MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
712
713static struct i2c_driver lm78_driver = {
714 .class = I2C_CLASS_HWMON,
715 .driver = {
716 .name = "lm78",
717 },
718 .probe = lm78_i2c_probe,
719 .remove = lm78_i2c_remove,
720 .id_table = lm78_i2c_id,
721 .detect = lm78_i2c_detect,
722 .address_list = normal_i2c,
723};
724
725/*
726 * The SMBus locks itself, but ISA access must be locked explicitly!
727 * We don't want to lock the whole ISA bus, so we lock each client
728 * separately.
729 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
730 * would slow down the LM78 access and should not be necessary.
731 */
732static int lm78_read_value(struct lm78_data *data, u8 reg)
733{
734 struct i2c_client *client = data->client;
735
736#ifdef CONFIG_ISA
737 if (!client) { /* ISA device */
738 int res;
739 mutex_lock(&data->lock);
740 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
741 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
742 mutex_unlock(&data->lock);
743 return res;
744 } else
745#endif
746 return i2c_smbus_read_byte_data(client, reg);
747}
748
749static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
750{
751 struct i2c_client *client = data->client;
752
753#ifdef CONFIG_ISA
754 if (!client) { /* ISA device */
755 mutex_lock(&data->lock);
756 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
757 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
758 mutex_unlock(&data->lock);
759 return 0;
760 } else
761#endif
762 return i2c_smbus_write_byte_data(client, reg, value);
763}
764
765static void lm78_init_device(struct lm78_data *data)
766{
767 u8 config;
768 int i;
769
770 /* Start monitoring */
771 config = lm78_read_value(data, LM78_REG_CONFIG);
772 if ((config & 0x09) != 0x01)
773 lm78_write_value(data, LM78_REG_CONFIG,
774 (config & 0xf7) | 0x01);
775
776 /* A few vars need to be filled upon startup */
777 for (i = 0; i < 3; i++) {
778 data->fan_min[i] = lm78_read_value(data,
779 LM78_REG_FAN_MIN(i));
780 }
781
782 mutex_init(&data->update_lock);
783}
784
785static struct lm78_data *lm78_update_device(struct device *dev)
786{
787 struct lm78_data *data = dev_get_drvdata(dev);
788 int i;
789
790 mutex_lock(&data->update_lock);
791
792 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
793 || !data->valid) {
794
795 dev_dbg(dev, "Starting lm78 update\n");
796
797 for (i = 0; i <= 6; i++) {
798 data->in[i] =
799 lm78_read_value(data, LM78_REG_IN(i));
800 data->in_min[i] =
801 lm78_read_value(data, LM78_REG_IN_MIN(i));
802 data->in_max[i] =
803 lm78_read_value(data, LM78_REG_IN_MAX(i));
804 }
805 for (i = 0; i < 3; i++) {
806 data->fan[i] =
807 lm78_read_value(data, LM78_REG_FAN(i));
808 data->fan_min[i] =
809 lm78_read_value(data, LM78_REG_FAN_MIN(i));
810 }
811 data->temp = lm78_read_value(data, LM78_REG_TEMP);
812 data->temp_over =
813 lm78_read_value(data, LM78_REG_TEMP_OVER);
814 data->temp_hyst =
815 lm78_read_value(data, LM78_REG_TEMP_HYST);
816 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
817 data->vid = i & 0x0f;
818 if (data->type == lm79)
819 data->vid |=
820 (lm78_read_value(data, LM78_REG_CHIPID) &
821 0x01) << 4;
822 else
823 data->vid |= 0x10;
824 data->fan_div[0] = (i >> 4) & 0x03;
825 data->fan_div[1] = i >> 6;
826 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
827 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
828 data->last_updated = jiffies;
829 data->valid = 1;
830
831 data->fan_div[2] = 1;
832 }
833
834 mutex_unlock(&data->update_lock);
835
836 return data;
837}
838
839#ifdef CONFIG_ISA
840static int lm78_isa_probe(struct platform_device *pdev)
841{
842 int err;
843 struct lm78_data *data;
844 struct resource *res;
845
846 /* Reserve the ISA region */
847 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
848 if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET,
849 2, "lm78"))
850 return -EBUSY;
851
852 data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL);
853 if (!data)
854 return -ENOMEM;
855
856 mutex_init(&data->lock);
857 data->isa_addr = res->start;
858 platform_set_drvdata(pdev, data);
859
860 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
861 data->type = lm79;
862 data->name = "lm79";
863 } else {
864 data->type = lm78;
865 data->name = "lm78";
866 }
867
868 /* Initialize the LM78 chip */
869 lm78_init_device(data);
870
871 /* Register sysfs hooks */
872 err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
873 if (err)
874 goto exit_remove_files;
875 err = device_create_file(&pdev->dev, &dev_attr_name);
876 if (err)
877 goto exit_remove_files;
878
879 data->hwmon_dev = hwmon_device_register(&pdev->dev);
880 if (IS_ERR(data->hwmon_dev)) {
881 err = PTR_ERR(data->hwmon_dev);
882 goto exit_remove_files;
883 }
884
885 return 0;
886
887 exit_remove_files:
888 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
889 device_remove_file(&pdev->dev, &dev_attr_name);
890 return err;
891}
892
893static int lm78_isa_remove(struct platform_device *pdev)
894{
895 struct lm78_data *data = platform_get_drvdata(pdev);
896
897 hwmon_device_unregister(data->hwmon_dev);
898 sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
899 device_remove_file(&pdev->dev, &dev_attr_name);
900
901 return 0;
902}
903
904static struct platform_driver lm78_isa_driver = {
905 .driver = {
906 .owner = THIS_MODULE,
907 .name = "lm78",
908 },
909 .probe = lm78_isa_probe,
910 .remove = lm78_isa_remove,
911};
912
913/* return 1 if a supported chip is found, 0 otherwise */
914static int __init lm78_isa_found(unsigned short address)
915{
916 int val, save, found = 0;
917 int port;
918
919 /*
920 * Some boards declare base+0 to base+7 as a PNP device, some base+4
921 * to base+7 and some base+5 to base+6. So we better request each port
922 * individually for the probing phase.
923 */
924 for (port = address; port < address + LM78_EXTENT; port++) {
925 if (!request_region(port, 1, "lm78")) {
926 pr_debug("Failed to request port 0x%x\n", port);
927 goto release;
928 }
929 }
930
931#define REALLY_SLOW_IO
932 /*
933 * We need the timeouts for at least some LM78-like
934 * chips. But only if we read 'undefined' registers.
935 */
936 val = inb_p(address + 1);
937 if (inb_p(address + 2) != val
938 || inb_p(address + 3) != val
939 || inb_p(address + 7) != val)
940 goto release;
941#undef REALLY_SLOW_IO
942
943 /*
944 * We should be able to change the 7 LSB of the address port. The
945 * MSB (busy flag) should be clear initially, set after the write.
946 */
947 save = inb_p(address + LM78_ADDR_REG_OFFSET);
948 if (save & 0x80)
949 goto release;
950 val = ~save & 0x7f;
951 outb_p(val, address + LM78_ADDR_REG_OFFSET);
952 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
953 outb_p(save, address + LM78_ADDR_REG_OFFSET);
954 goto release;
955 }
956
957 /* We found a device, now see if it could be an LM78 */
958 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
959 val = inb_p(address + LM78_DATA_REG_OFFSET);
960 if (val & 0x80)
961 goto release;
962 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
963 val = inb_p(address + LM78_DATA_REG_OFFSET);
964 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
965 goto release;
966
967 /* The busy flag should be clear again */
968 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
969 goto release;
970
971 /* Explicitly prevent the misdetection of Winbond chips */
972 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
973 val = inb_p(address + LM78_DATA_REG_OFFSET);
974 if (val == 0xa3 || val == 0x5c)
975 goto release;
976
977 /* Explicitly prevent the misdetection of ITE chips */
978 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
979 val = inb_p(address + LM78_DATA_REG_OFFSET);
980 if (val == 0x90)
981 goto release;
982
983 /* Determine the chip type */
984 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
985 val = inb_p(address + LM78_DATA_REG_OFFSET);
986 if (val == 0x00 || val == 0x20 /* LM78 */
987 || val == 0x40 /* LM78-J */
988 || (val & 0xfe) == 0xc0) /* LM79 */
989 found = 1;
990
991 if (found)
992 pr_info("Found an %s chip at %#x\n",
993 val & 0x80 ? "LM79" : "LM78", (int)address);
994
995 release:
996 for (port--; port >= address; port--)
997 release_region(port, 1);
998 return found;
999}
1000
1001static int __init lm78_isa_device_add(unsigned short address)
1002{
1003 struct resource res = {
1004 .start = address,
1005 .end = address + LM78_EXTENT - 1,
1006 .name = "lm78",
1007 .flags = IORESOURCE_IO,
1008 };
1009 int err;
1010
1011 pdev = platform_device_alloc("lm78", address);
1012 if (!pdev) {
1013 err = -ENOMEM;
1014 pr_err("Device allocation failed\n");
1015 goto exit;
1016 }
1017
1018 err = platform_device_add_resources(pdev, &res, 1);
1019 if (err) {
1020 pr_err("Device resource addition failed (%d)\n", err);
1021 goto exit_device_put;
1022 }
1023
1024 err = platform_device_add(pdev);
1025 if (err) {
1026 pr_err("Device addition failed (%d)\n", err);
1027 goto exit_device_put;
1028 }
1029
1030 return 0;
1031
1032 exit_device_put:
1033 platform_device_put(pdev);
1034 exit:
1035 pdev = NULL;
1036 return err;
1037}
1038
1039static int __init lm78_isa_register(void)
1040{
1041 int res;
1042
1043 if (lm78_isa_found(isa_address)) {
1044 res = platform_driver_register(&lm78_isa_driver);
1045 if (res)
1046 goto exit;
1047
1048 /* Sets global pdev as a side effect */
1049 res = lm78_isa_device_add(isa_address);
1050 if (res)
1051 goto exit_unreg_isa_driver;
1052 }
1053
1054 return 0;
1055
1056 exit_unreg_isa_driver:
1057 platform_driver_unregister(&lm78_isa_driver);
1058 exit:
1059 return res;
1060}
1061
1062static void lm78_isa_unregister(void)
1063{
1064 if (pdev) {
1065 platform_device_unregister(pdev);
1066 platform_driver_unregister(&lm78_isa_driver);
1067 }
1068}
1069#else /* !CONFIG_ISA */
1070
1071static int __init lm78_isa_register(void)
1072{
1073 return 0;
1074}
1075
1076static void lm78_isa_unregister(void)
1077{
1078}
1079#endif /* CONFIG_ISA */
1080
1081static int __init sm_lm78_init(void)
1082{
1083 int res;
1084
1085 /*
1086 * We register the ISA device first, so that we can skip the
1087 * registration of an I2C interface to the same device.
1088 */
1089 res = lm78_isa_register();
1090 if (res)
1091 goto exit;
1092
1093 res = i2c_add_driver(&lm78_driver);
1094 if (res)
1095 goto exit_unreg_isa_device;
1096
1097 return 0;
1098
1099 exit_unreg_isa_device:
1100 lm78_isa_unregister();
1101 exit:
1102 return res;
1103}
1104
1105static void __exit sm_lm78_exit(void)
1106{
1107 lm78_isa_unregister();
1108 i2c_del_driver(&lm78_driver);
1109}
1110
1111MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>");
1112MODULE_DESCRIPTION("LM78/LM79 driver");
1113MODULE_LICENSE("GPL");
1114
1115module_init(sm_lm78_init);
1116module_exit(sm_lm78_exit);