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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 <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(long 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 mutex lock;
127 enum chips type;
128
129 /* For ISA device only */
130 const char *name;
131 int isa_addr;
132
133 struct mutex update_lock;
134 char valid; /* !=0 if following fields are valid */
135 unsigned long last_updated; /* In jiffies */
136
137 u8 in[7]; /* Register value */
138 u8 in_max[7]; /* Register value */
139 u8 in_min[7]; /* Register value */
140 u8 fan[3]; /* Register value */
141 u8 fan_min[3]; /* Register value */
142 s8 temp; /* Register value */
143 s8 temp_over; /* Register value */
144 s8 temp_hyst; /* Register value */
145 u8 fan_div[3]; /* Register encoding, shifted right */
146 u8 vid; /* Register encoding, combined */
147 u16 alarms; /* Register encoding, combined */
148};
149
150
151static int lm78_read_value(struct lm78_data *data, u8 reg);
152static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
153static struct lm78_data *lm78_update_device(struct device *dev);
154static void lm78_init_device(struct lm78_data *data);
155
156
157/* 7 Voltages */
158static ssize_t show_in(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[attr->index]));
164}
165
166static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
167 char *buf)
168{
169 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
170 struct lm78_data *data = lm78_update_device(dev);
171 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
172}
173
174static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
175 char *buf)
176{
177 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
178 struct lm78_data *data = lm78_update_device(dev);
179 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
180}
181
182static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
183 const char *buf, size_t count)
184{
185 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
186 struct lm78_data *data = dev_get_drvdata(dev);
187 int nr = attr->index;
188 unsigned long val;
189 int err;
190
191 err = kstrtoul(buf, 10, &val);
192 if (err)
193 return err;
194
195 mutex_lock(&data->update_lock);
196 data->in_min[nr] = IN_TO_REG(val);
197 lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
198 mutex_unlock(&data->update_lock);
199 return count;
200}
201
202static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
203 const char *buf, size_t count)
204{
205 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
206 struct lm78_data *data = dev_get_drvdata(dev);
207 int nr = attr->index;
208 unsigned long val;
209 int err;
210
211 err = kstrtoul(buf, 10, &val);
212 if (err)
213 return err;
214
215 mutex_lock(&data->update_lock);
216 data->in_max[nr] = IN_TO_REG(val);
217 lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
218 mutex_unlock(&data->update_lock);
219 return count;
220}
221
222#define show_in_offset(offset) \
223static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
224 show_in, NULL, offset); \
225static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
226 show_in_min, set_in_min, offset); \
227static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
228 show_in_max, set_in_max, offset);
229
230show_in_offset(0);
231show_in_offset(1);
232show_in_offset(2);
233show_in_offset(3);
234show_in_offset(4);
235show_in_offset(5);
236show_in_offset(6);
237
238/* Temperature */
239static ssize_t show_temp(struct device *dev, struct device_attribute *da,
240 char *buf)
241{
242 struct lm78_data *data = lm78_update_device(dev);
243 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
244}
245
246static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
247 char *buf)
248{
249 struct lm78_data *data = lm78_update_device(dev);
250 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
251}
252
253static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
254 const char *buf, size_t count)
255{
256 struct lm78_data *data = dev_get_drvdata(dev);
257 long val;
258 int err;
259
260 err = kstrtol(buf, 10, &val);
261 if (err)
262 return err;
263
264 mutex_lock(&data->update_lock);
265 data->temp_over = TEMP_TO_REG(val);
266 lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
267 mutex_unlock(&data->update_lock);
268 return count;
269}
270
271static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
272 char *buf)
273{
274 struct lm78_data *data = lm78_update_device(dev);
275 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
276}
277
278static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
279 const char *buf, size_t count)
280{
281 struct lm78_data *data = dev_get_drvdata(dev);
282 long val;
283 int err;
284
285 err = kstrtol(buf, 10, &val);
286 if (err)
287 return err;
288
289 mutex_lock(&data->update_lock);
290 data->temp_hyst = TEMP_TO_REG(val);
291 lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
292 mutex_unlock(&data->update_lock);
293 return count;
294}
295
296static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
297static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
298 show_temp_over, set_temp_over);
299static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
300 show_temp_hyst, set_temp_hyst);
301
302/* 3 Fans */
303static ssize_t show_fan(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[nr],
310 DIV_FROM_REG(data->fan_div[nr])));
311}
312
313static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
314 char *buf)
315{
316 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
317 struct lm78_data *data = lm78_update_device(dev);
318 int nr = attr->index;
319 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
320 DIV_FROM_REG(data->fan_div[nr])));
321}
322
323static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
324 const char *buf, size_t count)
325{
326 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
327 struct lm78_data *data = dev_get_drvdata(dev);
328 int nr = attr->index;
329 unsigned long val;
330 int err;
331
332 err = kstrtoul(buf, 10, &val);
333 if (err)
334 return err;
335
336 mutex_lock(&data->update_lock);
337 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
338 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
339 mutex_unlock(&data->update_lock);
340 return count;
341}
342
343static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
344 char *buf)
345{
346 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
347 struct lm78_data *data = lm78_update_device(dev);
348 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
349}
350
351/*
352 * Note: we save and restore the fan minimum here, because its value is
353 * determined in part by the fan divisor. This follows the principle of
354 * least surprise; the user doesn't expect the fan minimum to change just
355 * because the divisor changed.
356 */
357static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
358 const char *buf, size_t count)
359{
360 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
361 struct lm78_data *data = dev_get_drvdata(dev);
362 int nr = attr->index;
363 unsigned long min;
364 u8 reg;
365 unsigned long val;
366 int err;
367
368 err = kstrtoul(buf, 10, &val);
369 if (err)
370 return err;
371
372 mutex_lock(&data->update_lock);
373 min = FAN_FROM_REG(data->fan_min[nr],
374 DIV_FROM_REG(data->fan_div[nr]));
375
376 switch (val) {
377 case 1:
378 data->fan_div[nr] = 0;
379 break;
380 case 2:
381 data->fan_div[nr] = 1;
382 break;
383 case 4:
384 data->fan_div[nr] = 2;
385 break;
386 case 8:
387 data->fan_div[nr] = 3;
388 break;
389 default:
390 dev_err(dev,
391 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
392 val);
393 mutex_unlock(&data->update_lock);
394 return -EINVAL;
395 }
396
397 reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
398 switch (nr) {
399 case 0:
400 reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
401 break;
402 case 1:
403 reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
404 break;
405 }
406 lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
407
408 data->fan_min[nr] =
409 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
410 lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
411 mutex_unlock(&data->update_lock);
412
413 return count;
414}
415
416#define show_fan_offset(offset) \
417static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
418 show_fan, NULL, offset - 1); \
419static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
420 show_fan_min, set_fan_min, offset - 1);
421
422show_fan_offset(1);
423show_fan_offset(2);
424show_fan_offset(3);
425
426/* Fan 3 divisor is locked in H/W */
427static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
428 show_fan_div, set_fan_div, 0);
429static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
430 show_fan_div, set_fan_div, 1);
431static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
432
433/* VID */
434static ssize_t show_vid(struct device *dev, struct device_attribute *da,
435 char *buf)
436{
437 struct lm78_data *data = lm78_update_device(dev);
438 return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
439}
440static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
441
442/* Alarms */
443static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
444 char *buf)
445{
446 struct lm78_data *data = lm78_update_device(dev);
447 return sprintf(buf, "%u\n", data->alarms);
448}
449static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
450
451static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
452 char *buf)
453{
454 struct lm78_data *data = lm78_update_device(dev);
455 int nr = to_sensor_dev_attr(da)->index;
456 return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
457}
458static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
459static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
460static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
461static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
462static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
463static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
464static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
465static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
466static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
467static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
468static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
469
470static struct attribute *lm78_attrs[] = {
471 &sensor_dev_attr_in0_input.dev_attr.attr,
472 &sensor_dev_attr_in0_min.dev_attr.attr,
473 &sensor_dev_attr_in0_max.dev_attr.attr,
474 &sensor_dev_attr_in0_alarm.dev_attr.attr,
475 &sensor_dev_attr_in1_input.dev_attr.attr,
476 &sensor_dev_attr_in1_min.dev_attr.attr,
477 &sensor_dev_attr_in1_max.dev_attr.attr,
478 &sensor_dev_attr_in1_alarm.dev_attr.attr,
479 &sensor_dev_attr_in2_input.dev_attr.attr,
480 &sensor_dev_attr_in2_min.dev_attr.attr,
481 &sensor_dev_attr_in2_max.dev_attr.attr,
482 &sensor_dev_attr_in2_alarm.dev_attr.attr,
483 &sensor_dev_attr_in3_input.dev_attr.attr,
484 &sensor_dev_attr_in3_min.dev_attr.attr,
485 &sensor_dev_attr_in3_max.dev_attr.attr,
486 &sensor_dev_attr_in3_alarm.dev_attr.attr,
487 &sensor_dev_attr_in4_input.dev_attr.attr,
488 &sensor_dev_attr_in4_min.dev_attr.attr,
489 &sensor_dev_attr_in4_max.dev_attr.attr,
490 &sensor_dev_attr_in4_alarm.dev_attr.attr,
491 &sensor_dev_attr_in5_input.dev_attr.attr,
492 &sensor_dev_attr_in5_min.dev_attr.attr,
493 &sensor_dev_attr_in5_max.dev_attr.attr,
494 &sensor_dev_attr_in5_alarm.dev_attr.attr,
495 &sensor_dev_attr_in6_input.dev_attr.attr,
496 &sensor_dev_attr_in6_min.dev_attr.attr,
497 &sensor_dev_attr_in6_max.dev_attr.attr,
498 &sensor_dev_attr_in6_alarm.dev_attr.attr,
499 &dev_attr_temp1_input.attr,
500 &dev_attr_temp1_max.attr,
501 &dev_attr_temp1_max_hyst.attr,
502 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
503 &sensor_dev_attr_fan1_input.dev_attr.attr,
504 &sensor_dev_attr_fan1_min.dev_attr.attr,
505 &sensor_dev_attr_fan1_div.dev_attr.attr,
506 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
507 &sensor_dev_attr_fan2_input.dev_attr.attr,
508 &sensor_dev_attr_fan2_min.dev_attr.attr,
509 &sensor_dev_attr_fan2_div.dev_attr.attr,
510 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
511 &sensor_dev_attr_fan3_input.dev_attr.attr,
512 &sensor_dev_attr_fan3_min.dev_attr.attr,
513 &sensor_dev_attr_fan3_div.dev_attr.attr,
514 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
515 &dev_attr_alarms.attr,
516 &dev_attr_cpu0_vid.attr,
517
518 NULL
519};
520
521ATTRIBUTE_GROUPS(lm78);
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
533static struct lm78_data *lm78_data_if_isa(void)
534{
535 return pdev ? platform_get_drvdata(pdev) : NULL;
536}
537
538/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
539static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
540{
541 struct lm78_data *isa;
542 int i;
543
544 if (!pdev) /* No ISA chip */
545 return 0;
546 isa = platform_get_drvdata(pdev);
547
548 if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
549 return 0; /* Address doesn't match */
550 if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
551 return 0; /* Chip type doesn't match */
552
553 /*
554 * We compare all the limit registers, the config register and the
555 * interrupt mask registers
556 */
557 for (i = 0x2b; i <= 0x3d; i++) {
558 if (lm78_read_value(isa, i) !=
559 i2c_smbus_read_byte_data(client, i))
560 return 0;
561 }
562 if (lm78_read_value(isa, LM78_REG_CONFIG) !=
563 i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
564 return 0;
565 for (i = 0x43; i <= 0x46; i++) {
566 if (lm78_read_value(isa, i) !=
567 i2c_smbus_read_byte_data(client, i))
568 return 0;
569 }
570
571 return 1;
572}
573#else /* !CONFIG_ISA */
574
575static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
576{
577 return 0;
578}
579
580static struct lm78_data *lm78_data_if_isa(void)
581{
582 return NULL;
583}
584#endif /* CONFIG_ISA */
585
586static int lm78_i2c_detect(struct i2c_client *client,
587 struct i2c_board_info *info)
588{
589 int i;
590 struct lm78_data *isa = lm78_data_if_isa();
591 const char *client_name;
592 struct i2c_adapter *adapter = client->adapter;
593 int address = client->addr;
594
595 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
596 return -ENODEV;
597
598 /*
599 * We block updates of the ISA device to minimize the risk of
600 * concurrent access to the same LM78 chip through different
601 * interfaces.
602 */
603 if (isa)
604 mutex_lock(&isa->update_lock);
605
606 if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
607 || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
608 goto err_nodev;
609
610 /* Explicitly prevent the misdetection of Winbond chips */
611 i = i2c_smbus_read_byte_data(client, 0x4f);
612 if (i == 0xa3 || i == 0x5c)
613 goto err_nodev;
614
615 /* Determine the chip type. */
616 i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
617 if (i == 0x00 || i == 0x20 /* LM78 */
618 || i == 0x40) /* LM78-J */
619 client_name = "lm78";
620 else if ((i & 0xfe) == 0xc0)
621 client_name = "lm79";
622 else
623 goto err_nodev;
624
625 if (lm78_alias_detect(client, i)) {
626 dev_dbg(&adapter->dev,
627 "Device at 0x%02x appears to be the same as ISA device\n",
628 address);
629 goto err_nodev;
630 }
631
632 if (isa)
633 mutex_unlock(&isa->update_lock);
634
635 strlcpy(info->type, client_name, I2C_NAME_SIZE);
636
637 return 0;
638
639 err_nodev:
640 if (isa)
641 mutex_unlock(&isa->update_lock);
642 return -ENODEV;
643}
644
645static int lm78_i2c_probe(struct i2c_client *client,
646 const struct i2c_device_id *id)
647{
648 struct device *dev = &client->dev;
649 struct device *hwmon_dev;
650 struct lm78_data *data;
651
652 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
653 if (!data)
654 return -ENOMEM;
655
656 data->client = client;
657 data->type = id->driver_data;
658
659 /* Initialize the LM78 chip */
660 lm78_init_device(data);
661
662 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
663 data, lm78_groups);
664 return PTR_ERR_OR_ZERO(hwmon_dev);
665}
666
667static const struct i2c_device_id lm78_i2c_id[] = {
668 { "lm78", lm78 },
669 { "lm79", lm79 },
670 { }
671};
672MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
673
674static struct i2c_driver lm78_driver = {
675 .class = I2C_CLASS_HWMON,
676 .driver = {
677 .name = "lm78",
678 },
679 .probe = lm78_i2c_probe,
680 .id_table = lm78_i2c_id,
681 .detect = lm78_i2c_detect,
682 .address_list = normal_i2c,
683};
684
685/*
686 * The SMBus locks itself, but ISA access must be locked explicitly!
687 * We don't want to lock the whole ISA bus, so we lock each client
688 * separately.
689 * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
690 * would slow down the LM78 access and should not be necessary.
691 */
692static int lm78_read_value(struct lm78_data *data, u8 reg)
693{
694 struct i2c_client *client = data->client;
695
696#ifdef CONFIG_ISA
697 if (!client) { /* ISA device */
698 int res;
699 mutex_lock(&data->lock);
700 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
701 res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
702 mutex_unlock(&data->lock);
703 return res;
704 } else
705#endif
706 return i2c_smbus_read_byte_data(client, reg);
707}
708
709static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
710{
711 struct i2c_client *client = data->client;
712
713#ifdef CONFIG_ISA
714 if (!client) { /* ISA device */
715 mutex_lock(&data->lock);
716 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
717 outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
718 mutex_unlock(&data->lock);
719 return 0;
720 } else
721#endif
722 return i2c_smbus_write_byte_data(client, reg, value);
723}
724
725static void lm78_init_device(struct lm78_data *data)
726{
727 u8 config;
728 int i;
729
730 /* Start monitoring */
731 config = lm78_read_value(data, LM78_REG_CONFIG);
732 if ((config & 0x09) != 0x01)
733 lm78_write_value(data, LM78_REG_CONFIG,
734 (config & 0xf7) | 0x01);
735
736 /* A few vars need to be filled upon startup */
737 for (i = 0; i < 3; i++) {
738 data->fan_min[i] = lm78_read_value(data,
739 LM78_REG_FAN_MIN(i));
740 }
741
742 mutex_init(&data->update_lock);
743}
744
745static struct lm78_data *lm78_update_device(struct device *dev)
746{
747 struct lm78_data *data = dev_get_drvdata(dev);
748 int i;
749
750 mutex_lock(&data->update_lock);
751
752 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
753 || !data->valid) {
754
755 dev_dbg(dev, "Starting lm78 update\n");
756
757 for (i = 0; i <= 6; i++) {
758 data->in[i] =
759 lm78_read_value(data, LM78_REG_IN(i));
760 data->in_min[i] =
761 lm78_read_value(data, LM78_REG_IN_MIN(i));
762 data->in_max[i] =
763 lm78_read_value(data, LM78_REG_IN_MAX(i));
764 }
765 for (i = 0; i < 3; i++) {
766 data->fan[i] =
767 lm78_read_value(data, LM78_REG_FAN(i));
768 data->fan_min[i] =
769 lm78_read_value(data, LM78_REG_FAN_MIN(i));
770 }
771 data->temp = lm78_read_value(data, LM78_REG_TEMP);
772 data->temp_over =
773 lm78_read_value(data, LM78_REG_TEMP_OVER);
774 data->temp_hyst =
775 lm78_read_value(data, LM78_REG_TEMP_HYST);
776 i = lm78_read_value(data, LM78_REG_VID_FANDIV);
777 data->vid = i & 0x0f;
778 if (data->type == lm79)
779 data->vid |=
780 (lm78_read_value(data, LM78_REG_CHIPID) &
781 0x01) << 4;
782 else
783 data->vid |= 0x10;
784 data->fan_div[0] = (i >> 4) & 0x03;
785 data->fan_div[1] = i >> 6;
786 data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
787 (lm78_read_value(data, LM78_REG_ALARM2) << 8);
788 data->last_updated = jiffies;
789 data->valid = 1;
790
791 data->fan_div[2] = 1;
792 }
793
794 mutex_unlock(&data->update_lock);
795
796 return data;
797}
798
799#ifdef CONFIG_ISA
800static int lm78_isa_probe(struct platform_device *pdev)
801{
802 struct device *dev = &pdev->dev;
803 struct device *hwmon_dev;
804 struct lm78_data *data;
805 struct resource *res;
806
807 /* Reserve the ISA region */
808 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
809 if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET,
810 2, "lm78"))
811 return -EBUSY;
812
813 data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
814 if (!data)
815 return -ENOMEM;
816
817 mutex_init(&data->lock);
818 data->isa_addr = res->start;
819 platform_set_drvdata(pdev, data);
820
821 if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
822 data->type = lm79;
823 data->name = "lm79";
824 } else {
825 data->type = lm78;
826 data->name = "lm78";
827 }
828
829 /* Initialize the LM78 chip */
830 lm78_init_device(data);
831
832 hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
833 data, lm78_groups);
834 return PTR_ERR_OR_ZERO(hwmon_dev);
835}
836
837static struct platform_driver lm78_isa_driver = {
838 .driver = {
839 .name = "lm78",
840 },
841 .probe = lm78_isa_probe,
842};
843
844/* return 1 if a supported chip is found, 0 otherwise */
845static int __init lm78_isa_found(unsigned short address)
846{
847 int val, save, found = 0;
848 int port;
849
850 /*
851 * Some boards declare base+0 to base+7 as a PNP device, some base+4
852 * to base+7 and some base+5 to base+6. So we better request each port
853 * individually for the probing phase.
854 */
855 for (port = address; port < address + LM78_EXTENT; port++) {
856 if (!request_region(port, 1, "lm78")) {
857 pr_debug("Failed to request port 0x%x\n", port);
858 goto release;
859 }
860 }
861
862#define REALLY_SLOW_IO
863 /*
864 * We need the timeouts for at least some LM78-like
865 * chips. But only if we read 'undefined' registers.
866 */
867 val = inb_p(address + 1);
868 if (inb_p(address + 2) != val
869 || inb_p(address + 3) != val
870 || inb_p(address + 7) != val)
871 goto release;
872#undef REALLY_SLOW_IO
873
874 /*
875 * We should be able to change the 7 LSB of the address port. The
876 * MSB (busy flag) should be clear initially, set after the write.
877 */
878 save = inb_p(address + LM78_ADDR_REG_OFFSET);
879 if (save & 0x80)
880 goto release;
881 val = ~save & 0x7f;
882 outb_p(val, address + LM78_ADDR_REG_OFFSET);
883 if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
884 outb_p(save, address + LM78_ADDR_REG_OFFSET);
885 goto release;
886 }
887
888 /* We found a device, now see if it could be an LM78 */
889 outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
890 val = inb_p(address + LM78_DATA_REG_OFFSET);
891 if (val & 0x80)
892 goto release;
893 outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
894 val = inb_p(address + LM78_DATA_REG_OFFSET);
895 if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
896 goto release;
897
898 /* The busy flag should be clear again */
899 if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
900 goto release;
901
902 /* Explicitly prevent the misdetection of Winbond chips */
903 outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
904 val = inb_p(address + LM78_DATA_REG_OFFSET);
905 if (val == 0xa3 || val == 0x5c)
906 goto release;
907
908 /* Explicitly prevent the misdetection of ITE chips */
909 outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
910 val = inb_p(address + LM78_DATA_REG_OFFSET);
911 if (val == 0x90)
912 goto release;
913
914 /* Determine the chip type */
915 outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
916 val = inb_p(address + LM78_DATA_REG_OFFSET);
917 if (val == 0x00 || val == 0x20 /* LM78 */
918 || val == 0x40 /* LM78-J */
919 || (val & 0xfe) == 0xc0) /* LM79 */
920 found = 1;
921
922 if (found)
923 pr_info("Found an %s chip at %#x\n",
924 val & 0x80 ? "LM79" : "LM78", (int)address);
925
926 release:
927 for (port--; port >= address; port--)
928 release_region(port, 1);
929 return found;
930}
931
932static int __init lm78_isa_device_add(unsigned short address)
933{
934 struct resource res = {
935 .start = address,
936 .end = address + LM78_EXTENT - 1,
937 .name = "lm78",
938 .flags = IORESOURCE_IO,
939 };
940 int err;
941
942 pdev = platform_device_alloc("lm78", address);
943 if (!pdev) {
944 err = -ENOMEM;
945 pr_err("Device allocation failed\n");
946 goto exit;
947 }
948
949 err = platform_device_add_resources(pdev, &res, 1);
950 if (err) {
951 pr_err("Device resource addition failed (%d)\n", err);
952 goto exit_device_put;
953 }
954
955 err = platform_device_add(pdev);
956 if (err) {
957 pr_err("Device addition failed (%d)\n", err);
958 goto exit_device_put;
959 }
960
961 return 0;
962
963 exit_device_put:
964 platform_device_put(pdev);
965 exit:
966 pdev = NULL;
967 return err;
968}
969
970static int __init lm78_isa_register(void)
971{
972 int res;
973
974 if (lm78_isa_found(isa_address)) {
975 res = platform_driver_register(&lm78_isa_driver);
976 if (res)
977 goto exit;
978
979 /* Sets global pdev as a side effect */
980 res = lm78_isa_device_add(isa_address);
981 if (res)
982 goto exit_unreg_isa_driver;
983 }
984
985 return 0;
986
987 exit_unreg_isa_driver:
988 platform_driver_unregister(&lm78_isa_driver);
989 exit:
990 return res;
991}
992
993static void lm78_isa_unregister(void)
994{
995 if (pdev) {
996 platform_device_unregister(pdev);
997 platform_driver_unregister(&lm78_isa_driver);
998 }
999}
1000#else /* !CONFIG_ISA */
1001
1002static int __init lm78_isa_register(void)
1003{
1004 return 0;
1005}
1006
1007static void lm78_isa_unregister(void)
1008{
1009}
1010#endif /* CONFIG_ISA */
1011
1012static int __init sm_lm78_init(void)
1013{
1014 int res;
1015
1016 /*
1017 * We register the ISA device first, so that we can skip the
1018 * registration of an I2C interface to the same device.
1019 */
1020 res = lm78_isa_register();
1021 if (res)
1022 goto exit;
1023
1024 res = i2c_add_driver(&lm78_driver);
1025 if (res)
1026 goto exit_unreg_isa_device;
1027
1028 return 0;
1029
1030 exit_unreg_isa_device:
1031 lm78_isa_unregister();
1032 exit:
1033 return res;
1034}
1035
1036static void __exit sm_lm78_exit(void)
1037{
1038 lm78_isa_unregister();
1039 i2c_del_driver(&lm78_driver);
1040}
1041
1042MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>");
1043MODULE_DESCRIPTION("LM78/LM79 driver");
1044MODULE_LICENSE("GPL");
1045
1046module_init(sm_lm78_init);
1047module_exit(sm_lm78_exit);