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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * lm80.c - From lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
6 * and Philip Edelbrock <phil@netroedge.com>
7 *
8 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
9 */
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-sysfs.h>
18#include <linux/err.h>
19#include <linux/mutex.h>
20
21/* Addresses to scan */
22static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
23 0x2e, 0x2f, I2C_CLIENT_END };
24
25/* Many LM80 constants specified below */
26
27/* The LM80 registers */
28#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
29#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
30#define LM80_REG_IN(nr) (0x20 + (nr))
31
32#define LM80_REG_FAN1 0x28
33#define LM80_REG_FAN2 0x29
34#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
35
36#define LM80_REG_TEMP 0x27
37#define LM80_REG_TEMP_HOT_MAX 0x38
38#define LM80_REG_TEMP_HOT_HYST 0x39
39#define LM80_REG_TEMP_OS_MAX 0x3a
40#define LM80_REG_TEMP_OS_HYST 0x3b
41
42#define LM80_REG_CONFIG 0x00
43#define LM80_REG_ALARM1 0x01
44#define LM80_REG_ALARM2 0x02
45#define LM80_REG_MASK1 0x03
46#define LM80_REG_MASK2 0x04
47#define LM80_REG_FANDIV 0x05
48#define LM80_REG_RES 0x06
49
50#define LM96080_REG_CONV_RATE 0x07
51#define LM96080_REG_MAN_ID 0x3e
52#define LM96080_REG_DEV_ID 0x3f
53
54
55/*
56 * Conversions. Rounding and limit checking is only done on the TO_REG
57 * variants. Note that you should be a bit careful with which arguments
58 * these macros are called: arguments may be evaluated more than once.
59 * Fixing this is just not worth it.
60 */
61
62#define IN_TO_REG(val) (clamp_val(((val) + 5) / 10, 0, 255))
63#define IN_FROM_REG(val) ((val) * 10)
64
65static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
66{
67 if (rpm == 0)
68 return 255;
69 rpm = clamp_val(rpm, 1, 1000000);
70 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
71}
72
73#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
74 (val) == 255 ? 0 : 1350000/((div) * (val)))
75
76#define TEMP_FROM_REG(reg) ((reg) * 125 / 32)
77#define TEMP_TO_REG(temp) (DIV_ROUND_CLOSEST(clamp_val((temp), \
78 -128000, 127000), 1000) << 8)
79
80#define DIV_FROM_REG(val) (1 << (val))
81
82enum temp_index {
83 t_input = 0,
84 t_hot_max,
85 t_hot_hyst,
86 t_os_max,
87 t_os_hyst,
88 t_num_temp
89};
90
91static const u8 temp_regs[t_num_temp] = {
92 [t_input] = LM80_REG_TEMP,
93 [t_hot_max] = LM80_REG_TEMP_HOT_MAX,
94 [t_hot_hyst] = LM80_REG_TEMP_HOT_HYST,
95 [t_os_max] = LM80_REG_TEMP_OS_MAX,
96 [t_os_hyst] = LM80_REG_TEMP_OS_HYST,
97};
98
99enum in_index {
100 i_input = 0,
101 i_max,
102 i_min,
103 i_num_in
104};
105
106enum fan_index {
107 f_input,
108 f_min,
109 f_num_fan
110};
111
112/*
113 * Client data (each client gets its own)
114 */
115
116struct lm80_data {
117 struct i2c_client *client;
118 struct mutex update_lock;
119 char error; /* !=0 if error occurred during last update */
120 bool valid; /* true if following fields are valid */
121 unsigned long last_updated; /* In jiffies */
122
123 u8 in[i_num_in][7]; /* Register value, 1st index is enum in_index */
124 u8 fan[f_num_fan][2]; /* Register value, 1st index enum fan_index */
125 u8 fan_div[2]; /* Register encoding, shifted right */
126 s16 temp[t_num_temp]; /* Register values, normalized to 16 bit */
127 u16 alarms; /* Register encoding, combined */
128};
129
130static int lm80_read_value(struct i2c_client *client, u8 reg)
131{
132 return i2c_smbus_read_byte_data(client, reg);
133}
134
135static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
136{
137 return i2c_smbus_write_byte_data(client, reg, value);
138}
139
140/* Called when we have found a new LM80 and after read errors */
141static void lm80_init_client(struct i2c_client *client)
142{
143 /*
144 * Reset all except Watchdog values and last conversion values
145 * This sets fan-divs to 2, among others. This makes most other
146 * initializations unnecessary
147 */
148 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
149 /* Set 11-bit temperature resolution */
150 lm80_write_value(client, LM80_REG_RES, 0x08);
151
152 /* Start monitoring */
153 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
154}
155
156static struct lm80_data *lm80_update_device(struct device *dev)
157{
158 struct lm80_data *data = dev_get_drvdata(dev);
159 struct i2c_client *client = data->client;
160 int i;
161 int rv;
162 int prev_rv;
163 struct lm80_data *ret = data;
164
165 mutex_lock(&data->update_lock);
166
167 if (data->error)
168 lm80_init_client(client);
169
170 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
171 dev_dbg(dev, "Starting lm80 update\n");
172 for (i = 0; i <= 6; i++) {
173 rv = lm80_read_value(client, LM80_REG_IN(i));
174 if (rv < 0)
175 goto abort;
176 data->in[i_input][i] = rv;
177
178 rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
179 if (rv < 0)
180 goto abort;
181 data->in[i_min][i] = rv;
182
183 rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
184 if (rv < 0)
185 goto abort;
186 data->in[i_max][i] = rv;
187 }
188
189 rv = lm80_read_value(client, LM80_REG_FAN1);
190 if (rv < 0)
191 goto abort;
192 data->fan[f_input][0] = rv;
193
194 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
195 if (rv < 0)
196 goto abort;
197 data->fan[f_min][0] = rv;
198
199 rv = lm80_read_value(client, LM80_REG_FAN2);
200 if (rv < 0)
201 goto abort;
202 data->fan[f_input][1] = rv;
203
204 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
205 if (rv < 0)
206 goto abort;
207 data->fan[f_min][1] = rv;
208
209 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
210 if (rv < 0)
211 goto abort;
212 rv = lm80_read_value(client, LM80_REG_RES);
213 if (rv < 0)
214 goto abort;
215 data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0);
216
217 for (i = t_input + 1; i < t_num_temp; i++) {
218 rv = lm80_read_value(client, temp_regs[i]);
219 if (rv < 0)
220 goto abort;
221 data->temp[i] = rv << 8;
222 }
223
224 rv = lm80_read_value(client, LM80_REG_FANDIV);
225 if (rv < 0)
226 goto abort;
227 data->fan_div[0] = (rv >> 2) & 0x03;
228 data->fan_div[1] = (rv >> 4) & 0x03;
229
230 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
231 if (rv < 0)
232 goto abort;
233 rv = lm80_read_value(client, LM80_REG_ALARM2);
234 if (rv < 0)
235 goto abort;
236 data->alarms = prev_rv + (rv << 8);
237
238 data->last_updated = jiffies;
239 data->valid = true;
240 data->error = 0;
241 }
242 goto done;
243
244abort:
245 ret = ERR_PTR(rv);
246 data->valid = false;
247 data->error = 1;
248
249done:
250 mutex_unlock(&data->update_lock);
251
252 return ret;
253}
254
255/*
256 * Sysfs stuff
257 */
258
259static ssize_t in_show(struct device *dev, struct device_attribute *attr,
260 char *buf)
261{
262 struct lm80_data *data = lm80_update_device(dev);
263 int index = to_sensor_dev_attr_2(attr)->index;
264 int nr = to_sensor_dev_attr_2(attr)->nr;
265
266 if (IS_ERR(data))
267 return PTR_ERR(data);
268 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr][index]));
269}
270
271static ssize_t in_store(struct device *dev, struct device_attribute *attr,
272 const char *buf, size_t count)
273{
274 struct lm80_data *data = dev_get_drvdata(dev);
275 struct i2c_client *client = data->client;
276 int index = to_sensor_dev_attr_2(attr)->index;
277 int nr = to_sensor_dev_attr_2(attr)->nr;
278 long val;
279 u8 reg;
280 int err = kstrtol(buf, 10, &val);
281 if (err < 0)
282 return err;
283
284 reg = nr == i_min ? LM80_REG_IN_MIN(index) : LM80_REG_IN_MAX(index);
285
286 mutex_lock(&data->update_lock);
287 data->in[nr][index] = IN_TO_REG(val);
288 lm80_write_value(client, reg, data->in[nr][index]);
289 mutex_unlock(&data->update_lock);
290 return count;
291}
292
293static ssize_t fan_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
295{
296 int index = to_sensor_dev_attr_2(attr)->index;
297 int nr = to_sensor_dev_attr_2(attr)->nr;
298 struct lm80_data *data = lm80_update_device(dev);
299 if (IS_ERR(data))
300 return PTR_ERR(data);
301 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr][index],
302 DIV_FROM_REG(data->fan_div[index])));
303}
304
305static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
306 char *buf)
307{
308 int nr = to_sensor_dev_attr(attr)->index;
309 struct lm80_data *data = lm80_update_device(dev);
310 if (IS_ERR(data))
311 return PTR_ERR(data);
312 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
313}
314
315static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
316 const char *buf, size_t count)
317{
318 int index = to_sensor_dev_attr_2(attr)->index;
319 int nr = to_sensor_dev_attr_2(attr)->nr;
320 struct lm80_data *data = dev_get_drvdata(dev);
321 struct i2c_client *client = data->client;
322 unsigned long val;
323 int err = kstrtoul(buf, 10, &val);
324 if (err < 0)
325 return err;
326
327 mutex_lock(&data->update_lock);
328 data->fan[nr][index] = FAN_TO_REG(val,
329 DIV_FROM_REG(data->fan_div[index]));
330 lm80_write_value(client, LM80_REG_FAN_MIN(index + 1),
331 data->fan[nr][index]);
332 mutex_unlock(&data->update_lock);
333 return count;
334}
335
336/*
337 * Note: we save and restore the fan minimum here, because its value is
338 * determined in part by the fan divisor. This follows the principle of
339 * least surprise; the user doesn't expect the fan minimum to change just
340 * because the divisor changed.
341 */
342static ssize_t fan_div_store(struct device *dev,
343 struct device_attribute *attr, const char *buf,
344 size_t count)
345{
346 int nr = to_sensor_dev_attr(attr)->index;
347 struct lm80_data *data = dev_get_drvdata(dev);
348 struct i2c_client *client = data->client;
349 unsigned long min, val;
350 u8 reg;
351 int rv;
352
353 rv = kstrtoul(buf, 10, &val);
354 if (rv < 0)
355 return rv;
356
357 /* Save fan_min */
358 mutex_lock(&data->update_lock);
359 min = FAN_FROM_REG(data->fan[f_min][nr],
360 DIV_FROM_REG(data->fan_div[nr]));
361
362 switch (val) {
363 case 1:
364 data->fan_div[nr] = 0;
365 break;
366 case 2:
367 data->fan_div[nr] = 1;
368 break;
369 case 4:
370 data->fan_div[nr] = 2;
371 break;
372 case 8:
373 data->fan_div[nr] = 3;
374 break;
375 default:
376 dev_err(dev,
377 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
378 val);
379 mutex_unlock(&data->update_lock);
380 return -EINVAL;
381 }
382
383 rv = lm80_read_value(client, LM80_REG_FANDIV);
384 if (rv < 0) {
385 mutex_unlock(&data->update_lock);
386 return rv;
387 }
388 reg = (rv & ~(3 << (2 * (nr + 1))))
389 | (data->fan_div[nr] << (2 * (nr + 1)));
390 lm80_write_value(client, LM80_REG_FANDIV, reg);
391
392 /* Restore fan_min */
393 data->fan[f_min][nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
394 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1),
395 data->fan[f_min][nr]);
396 mutex_unlock(&data->update_lock);
397
398 return count;
399}
400
401static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
402 char *buf)
403{
404 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
405 struct lm80_data *data = lm80_update_device(dev);
406 if (IS_ERR(data))
407 return PTR_ERR(data);
408 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
409}
410
411static ssize_t temp_store(struct device *dev,
412 struct device_attribute *devattr, const char *buf,
413 size_t count)
414{
415 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
416 struct lm80_data *data = dev_get_drvdata(dev);
417 struct i2c_client *client = data->client;
418 int nr = attr->index;
419 long val;
420 int err = kstrtol(buf, 10, &val);
421 if (err < 0)
422 return err;
423
424 mutex_lock(&data->update_lock);
425 data->temp[nr] = TEMP_TO_REG(val);
426 lm80_write_value(client, temp_regs[nr], data->temp[nr] >> 8);
427 mutex_unlock(&data->update_lock);
428 return count;
429}
430
431static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
432 char *buf)
433{
434 struct lm80_data *data = lm80_update_device(dev);
435 if (IS_ERR(data))
436 return PTR_ERR(data);
437 return sprintf(buf, "%u\n", data->alarms);
438}
439
440static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
441 char *buf)
442{
443 int bitnr = to_sensor_dev_attr(attr)->index;
444 struct lm80_data *data = lm80_update_device(dev);
445 if (IS_ERR(data))
446 return PTR_ERR(data);
447 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
448}
449
450static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, i_min, 0);
451static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, i_min, 1);
452static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, i_min, 2);
453static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, i_min, 3);
454static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, i_min, 4);
455static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, i_min, 5);
456static SENSOR_DEVICE_ATTR_2_RW(in6_min, in, i_min, 6);
457static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, i_max, 0);
458static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, i_max, 1);
459static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, i_max, 2);
460static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, i_max, 3);
461static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, i_max, 4);
462static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, i_max, 5);
463static SENSOR_DEVICE_ATTR_2_RW(in6_max, in, i_max, 6);
464static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, i_input, 0);
465static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, i_input, 1);
466static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, i_input, 2);
467static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, i_input, 3);
468static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, i_input, 4);
469static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, i_input, 5);
470static SENSOR_DEVICE_ATTR_2_RO(in6_input, in, i_input, 6);
471static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, f_min, 0);
472static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, f_min, 1);
473static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, f_input, 0);
474static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, f_input, 1);
475static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
476static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
477static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
478static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_hot_max);
479static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, t_hot_hyst);
480static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_os_max);
481static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp, t_os_hyst);
482static DEVICE_ATTR_RO(alarms);
483static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
484static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
485static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
486static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
487static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 4);
488static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 5);
489static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
490static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 10);
491static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 11);
492static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 8);
493static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 13);
494
495/*
496 * Real code
497 */
498
499static struct attribute *lm80_attrs[] = {
500 &sensor_dev_attr_in0_min.dev_attr.attr,
501 &sensor_dev_attr_in1_min.dev_attr.attr,
502 &sensor_dev_attr_in2_min.dev_attr.attr,
503 &sensor_dev_attr_in3_min.dev_attr.attr,
504 &sensor_dev_attr_in4_min.dev_attr.attr,
505 &sensor_dev_attr_in5_min.dev_attr.attr,
506 &sensor_dev_attr_in6_min.dev_attr.attr,
507 &sensor_dev_attr_in0_max.dev_attr.attr,
508 &sensor_dev_attr_in1_max.dev_attr.attr,
509 &sensor_dev_attr_in2_max.dev_attr.attr,
510 &sensor_dev_attr_in3_max.dev_attr.attr,
511 &sensor_dev_attr_in4_max.dev_attr.attr,
512 &sensor_dev_attr_in5_max.dev_attr.attr,
513 &sensor_dev_attr_in6_max.dev_attr.attr,
514 &sensor_dev_attr_in0_input.dev_attr.attr,
515 &sensor_dev_attr_in1_input.dev_attr.attr,
516 &sensor_dev_attr_in2_input.dev_attr.attr,
517 &sensor_dev_attr_in3_input.dev_attr.attr,
518 &sensor_dev_attr_in4_input.dev_attr.attr,
519 &sensor_dev_attr_in5_input.dev_attr.attr,
520 &sensor_dev_attr_in6_input.dev_attr.attr,
521 &sensor_dev_attr_fan1_min.dev_attr.attr,
522 &sensor_dev_attr_fan2_min.dev_attr.attr,
523 &sensor_dev_attr_fan1_input.dev_attr.attr,
524 &sensor_dev_attr_fan2_input.dev_attr.attr,
525 &sensor_dev_attr_fan1_div.dev_attr.attr,
526 &sensor_dev_attr_fan2_div.dev_attr.attr,
527 &sensor_dev_attr_temp1_input.dev_attr.attr,
528 &sensor_dev_attr_temp1_max.dev_attr.attr,
529 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
530 &sensor_dev_attr_temp1_crit.dev_attr.attr,
531 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
532 &dev_attr_alarms.attr,
533 &sensor_dev_attr_in0_alarm.dev_attr.attr,
534 &sensor_dev_attr_in1_alarm.dev_attr.attr,
535 &sensor_dev_attr_in2_alarm.dev_attr.attr,
536 &sensor_dev_attr_in3_alarm.dev_attr.attr,
537 &sensor_dev_attr_in4_alarm.dev_attr.attr,
538 &sensor_dev_attr_in5_alarm.dev_attr.attr,
539 &sensor_dev_attr_in6_alarm.dev_attr.attr,
540 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
541 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
542 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
543 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
544 NULL
545};
546ATTRIBUTE_GROUPS(lm80);
547
548/* Return 0 if detection is successful, -ENODEV otherwise */
549static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
550{
551 struct i2c_adapter *adapter = client->adapter;
552 int i, cur, man_id, dev_id;
553 const char *name = NULL;
554
555 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
556 return -ENODEV;
557
558 /* First check for unused bits, common to both chip types */
559 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
560 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
561 return -ENODEV;
562
563 /*
564 * The LM96080 has manufacturer and stepping/die rev registers so we
565 * can just check that. The LM80 does not have such registers so we
566 * have to use a more expensive trick.
567 */
568 man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
569 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
570 if (man_id == 0x01 && dev_id == 0x08) {
571 /* Check more unused bits for confirmation */
572 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
573 return -ENODEV;
574
575 name = "lm96080";
576 } else {
577 /* Check 6-bit addressing */
578 for (i = 0x2a; i <= 0x3d; i++) {
579 cur = i2c_smbus_read_byte_data(client, i);
580 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
581 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
582 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
583 return -ENODEV;
584 }
585
586 name = "lm80";
587 }
588
589 strscpy(info->type, name, I2C_NAME_SIZE);
590
591 return 0;
592}
593
594static int lm80_probe(struct i2c_client *client)
595{
596 struct device *dev = &client->dev;
597 struct device *hwmon_dev;
598 struct lm80_data *data;
599
600 data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
601 if (!data)
602 return -ENOMEM;
603
604 data->client = client;
605 mutex_init(&data->update_lock);
606
607 /* Initialize the LM80 chip */
608 lm80_init_client(client);
609
610 /* A few vars need to be filled upon startup */
611 data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
612 data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
613
614 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
615 data, lm80_groups);
616
617 return PTR_ERR_OR_ZERO(hwmon_dev);
618}
619
620/*
621 * Driver data (common to all clients)
622 */
623
624static const struct i2c_device_id lm80_id[] = {
625 { "lm80", 0 },
626 { "lm96080", 1 },
627 { }
628};
629MODULE_DEVICE_TABLE(i2c, lm80_id);
630
631static struct i2c_driver lm80_driver = {
632 .class = I2C_CLASS_HWMON,
633 .driver = {
634 .name = "lm80",
635 },
636 .probe = lm80_probe,
637 .id_table = lm80_id,
638 .detect = lm80_detect,
639 .address_list = normal_i2c,
640};
641
642module_i2c_driver(lm80_driver);
643
644MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
645 "Philip Edelbrock <phil@netroedge.com>");
646MODULE_DESCRIPTION("LM80 driver");
647MODULE_LICENSE("GPL");
1/*
2 * lm80.c - From lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
5 * and Philip Edelbrock <phil@netroedge.com>
6 *
7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
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-sysfs.h>
31#include <linux/err.h>
32#include <linux/mutex.h>
33
34/* Addresses to scan */
35static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
37
38/* Many LM80 constants specified below */
39
40/* The LM80 registers */
41#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
42#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
43#define LM80_REG_IN(nr) (0x20 + (nr))
44
45#define LM80_REG_FAN1 0x28
46#define LM80_REG_FAN2 0x29
47#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
48
49#define LM80_REG_TEMP 0x27
50#define LM80_REG_TEMP_HOT_MAX 0x38
51#define LM80_REG_TEMP_HOT_HYST 0x39
52#define LM80_REG_TEMP_OS_MAX 0x3a
53#define LM80_REG_TEMP_OS_HYST 0x3b
54
55#define LM80_REG_CONFIG 0x00
56#define LM80_REG_ALARM1 0x01
57#define LM80_REG_ALARM2 0x02
58#define LM80_REG_MASK1 0x03
59#define LM80_REG_MASK2 0x04
60#define LM80_REG_FANDIV 0x05
61#define LM80_REG_RES 0x06
62
63
64/* Conversions. Rounding and limit checking is only done on the TO_REG
65 variants. Note that you should be a bit careful with which arguments
66 these macros are called: arguments may be evaluated more than once.
67 Fixing this is just not worth it. */
68
69#define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255))
70#define IN_FROM_REG(val) ((val)*10)
71
72static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
73{
74 if (rpm == 0)
75 return 255;
76 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
77 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
78}
79
80#define FAN_FROM_REG(val,div) ((val)==0?-1:\
81 (val)==255?0:1350000/((div)*(val)))
82
83static inline long TEMP_FROM_REG(u16 temp)
84{
85 long res;
86
87 temp >>= 4;
88 if (temp < 0x0800)
89 res = 625 * (long) temp;
90 else
91 res = ((long) temp - 0x01000) * 625;
92
93 return res / 10;
94}
95
96#define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
97
98#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\
99 ((val)-500)/1000:((val)+500)/1000,0,255)
100
101#define DIV_FROM_REG(val) (1 << (val))
102
103/*
104 * Client data (each client gets its own)
105 */
106
107struct lm80_data {
108 struct device *hwmon_dev;
109 struct mutex update_lock;
110 char valid; /* !=0 if following fields are valid */
111 unsigned long last_updated; /* In jiffies */
112
113 u8 in[7]; /* Register value */
114 u8 in_max[7]; /* Register value */
115 u8 in_min[7]; /* Register value */
116 u8 fan[2]; /* Register value */
117 u8 fan_min[2]; /* Register value */
118 u8 fan_div[2]; /* Register encoding, shifted right */
119 u16 temp; /* Register values, shifted right */
120 u8 temp_hot_max; /* Register value */
121 u8 temp_hot_hyst; /* Register value */
122 u8 temp_os_max; /* Register value */
123 u8 temp_os_hyst; /* Register value */
124 u16 alarms; /* Register encoding, combined */
125};
126
127/*
128 * Functions declaration
129 */
130
131static int lm80_probe(struct i2c_client *client,
132 const struct i2c_device_id *id);
133static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
134static void lm80_init_client(struct i2c_client *client);
135static int lm80_remove(struct i2c_client *client);
136static struct lm80_data *lm80_update_device(struct device *dev);
137static int lm80_read_value(struct i2c_client *client, u8 reg);
138static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
139
140/*
141 * Driver data (common to all clients)
142 */
143
144static const struct i2c_device_id lm80_id[] = {
145 { "lm80", 0 },
146 { }
147};
148MODULE_DEVICE_TABLE(i2c, lm80_id);
149
150static struct i2c_driver lm80_driver = {
151 .class = I2C_CLASS_HWMON,
152 .driver = {
153 .name = "lm80",
154 },
155 .probe = lm80_probe,
156 .remove = lm80_remove,
157 .id_table = lm80_id,
158 .detect = lm80_detect,
159 .address_list = normal_i2c,
160};
161
162/*
163 * Sysfs stuff
164 */
165
166#define show_in(suffix, value) \
167static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
168{ \
169 int nr = to_sensor_dev_attr(attr)->index; \
170 struct lm80_data *data = lm80_update_device(dev); \
171 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
172}
173show_in(min, in_min)
174show_in(max, in_max)
175show_in(input, in)
176
177#define set_in(suffix, value, reg) \
178static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
179 size_t count) \
180{ \
181 int nr = to_sensor_dev_attr(attr)->index; \
182 struct i2c_client *client = to_i2c_client(dev); \
183 struct lm80_data *data = i2c_get_clientdata(client); \
184 long val = simple_strtol(buf, NULL, 10); \
185 \
186 mutex_lock(&data->update_lock);\
187 data->value[nr] = IN_TO_REG(val); \
188 lm80_write_value(client, reg(nr), data->value[nr]); \
189 mutex_unlock(&data->update_lock);\
190 return count; \
191}
192set_in(min, in_min, LM80_REG_IN_MIN)
193set_in(max, in_max, LM80_REG_IN_MAX)
194
195#define show_fan(suffix, value) \
196static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
197{ \
198 int nr = to_sensor_dev_attr(attr)->index; \
199 struct lm80_data *data = lm80_update_device(dev); \
200 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
201 DIV_FROM_REG(data->fan_div[nr]))); \
202}
203show_fan(min, fan_min)
204show_fan(input, fan)
205
206static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
207 char *buf)
208{
209 int nr = to_sensor_dev_attr(attr)->index;
210 struct lm80_data *data = lm80_update_device(dev);
211 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
212}
213
214static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
215 const char *buf, size_t count)
216{
217 int nr = to_sensor_dev_attr(attr)->index;
218 struct i2c_client *client = to_i2c_client(dev);
219 struct lm80_data *data = i2c_get_clientdata(client);
220 long val = simple_strtoul(buf, NULL, 10);
221
222 mutex_lock(&data->update_lock);
223 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
224 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
225 mutex_unlock(&data->update_lock);
226 return count;
227}
228
229/* Note: we save and restore the fan minimum here, because its value is
230 determined in part by the fan divisor. This follows the principle of
231 least surprise; the user doesn't expect the fan minimum to change just
232 because the divisor changed. */
233static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
235{
236 int nr = to_sensor_dev_attr(attr)->index;
237 struct i2c_client *client = to_i2c_client(dev);
238 struct lm80_data *data = i2c_get_clientdata(client);
239 unsigned long min, val = simple_strtoul(buf, NULL, 10);
240 u8 reg;
241
242 /* Save fan_min */
243 mutex_lock(&data->update_lock);
244 min = FAN_FROM_REG(data->fan_min[nr],
245 DIV_FROM_REG(data->fan_div[nr]));
246
247 switch (val) {
248 case 1: data->fan_div[nr] = 0; break;
249 case 2: data->fan_div[nr] = 1; break;
250 case 4: data->fan_div[nr] = 2; break;
251 case 8: data->fan_div[nr] = 3; break;
252 default:
253 dev_err(&client->dev, "fan_div value %ld not "
254 "supported. Choose one of 1, 2, 4 or 8!\n", val);
255 mutex_unlock(&data->update_lock);
256 return -EINVAL;
257 }
258
259 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
260 | (data->fan_div[nr] << (2 * (nr + 1)));
261 lm80_write_value(client, LM80_REG_FANDIV, reg);
262
263 /* Restore fan_min */
264 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
265 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
266 mutex_unlock(&data->update_lock);
267
268 return count;
269}
270
271static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
272{
273 struct lm80_data *data = lm80_update_device(dev);
274 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
275}
276
277#define show_temp(suffix, value) \
278static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
279{ \
280 struct lm80_data *data = lm80_update_device(dev); \
281 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
282}
283show_temp(hot_max, temp_hot_max);
284show_temp(hot_hyst, temp_hot_hyst);
285show_temp(os_max, temp_os_max);
286show_temp(os_hyst, temp_os_hyst);
287
288#define set_temp(suffix, value, reg) \
289static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
290 size_t count) \
291{ \
292 struct i2c_client *client = to_i2c_client(dev); \
293 struct lm80_data *data = i2c_get_clientdata(client); \
294 long val = simple_strtoul(buf, NULL, 10); \
295 \
296 mutex_lock(&data->update_lock); \
297 data->value = TEMP_LIMIT_TO_REG(val); \
298 lm80_write_value(client, reg, data->value); \
299 mutex_unlock(&data->update_lock); \
300 return count; \
301}
302set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
303set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
304set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
305set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
306
307static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
308 char *buf)
309{
310 struct lm80_data *data = lm80_update_device(dev);
311 return sprintf(buf, "%u\n", data->alarms);
312}
313
314static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 int bitnr = to_sensor_dev_attr(attr)->index;
318 struct lm80_data *data = lm80_update_device(dev);
319 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
320}
321
322static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
323 show_in_min, set_in_min, 0);
324static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
325 show_in_min, set_in_min, 1);
326static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
327 show_in_min, set_in_min, 2);
328static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
329 show_in_min, set_in_min, 3);
330static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
331 show_in_min, set_in_min, 4);
332static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
333 show_in_min, set_in_min, 5);
334static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
335 show_in_min, set_in_min, 6);
336static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
337 show_in_max, set_in_max, 0);
338static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
339 show_in_max, set_in_max, 1);
340static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
341 show_in_max, set_in_max, 2);
342static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
343 show_in_max, set_in_max, 3);
344static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
345 show_in_max, set_in_max, 4);
346static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
347 show_in_max, set_in_max, 5);
348static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
349 show_in_max, set_in_max, 6);
350static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
351static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
352static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
353static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
354static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
355static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
356static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
357static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
358 show_fan_min, set_fan_min, 0);
359static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
360 show_fan_min, set_fan_min, 1);
361static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
362static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
363static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
364 show_fan_div, set_fan_div, 0);
365static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
366 show_fan_div, set_fan_div, 1);
367static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
368static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
369 set_temp_hot_max);
370static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
371 set_temp_hot_hyst);
372static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
373 set_temp_os_max);
374static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
375 set_temp_os_hyst);
376static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
377static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
378static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
379static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
380static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
381static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
382static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
383static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
384static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
385static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
386static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
387static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
388
389/*
390 * Real code
391 */
392
393static struct attribute *lm80_attributes[] = {
394 &sensor_dev_attr_in0_min.dev_attr.attr,
395 &sensor_dev_attr_in1_min.dev_attr.attr,
396 &sensor_dev_attr_in2_min.dev_attr.attr,
397 &sensor_dev_attr_in3_min.dev_attr.attr,
398 &sensor_dev_attr_in4_min.dev_attr.attr,
399 &sensor_dev_attr_in5_min.dev_attr.attr,
400 &sensor_dev_attr_in6_min.dev_attr.attr,
401 &sensor_dev_attr_in0_max.dev_attr.attr,
402 &sensor_dev_attr_in1_max.dev_attr.attr,
403 &sensor_dev_attr_in2_max.dev_attr.attr,
404 &sensor_dev_attr_in3_max.dev_attr.attr,
405 &sensor_dev_attr_in4_max.dev_attr.attr,
406 &sensor_dev_attr_in5_max.dev_attr.attr,
407 &sensor_dev_attr_in6_max.dev_attr.attr,
408 &sensor_dev_attr_in0_input.dev_attr.attr,
409 &sensor_dev_attr_in1_input.dev_attr.attr,
410 &sensor_dev_attr_in2_input.dev_attr.attr,
411 &sensor_dev_attr_in3_input.dev_attr.attr,
412 &sensor_dev_attr_in4_input.dev_attr.attr,
413 &sensor_dev_attr_in5_input.dev_attr.attr,
414 &sensor_dev_attr_in6_input.dev_attr.attr,
415 &sensor_dev_attr_fan1_min.dev_attr.attr,
416 &sensor_dev_attr_fan2_min.dev_attr.attr,
417 &sensor_dev_attr_fan1_input.dev_attr.attr,
418 &sensor_dev_attr_fan2_input.dev_attr.attr,
419 &sensor_dev_attr_fan1_div.dev_attr.attr,
420 &sensor_dev_attr_fan2_div.dev_attr.attr,
421 &dev_attr_temp1_input.attr,
422 &dev_attr_temp1_max.attr,
423 &dev_attr_temp1_max_hyst.attr,
424 &dev_attr_temp1_crit.attr,
425 &dev_attr_temp1_crit_hyst.attr,
426 &dev_attr_alarms.attr,
427 &sensor_dev_attr_in0_alarm.dev_attr.attr,
428 &sensor_dev_attr_in1_alarm.dev_attr.attr,
429 &sensor_dev_attr_in2_alarm.dev_attr.attr,
430 &sensor_dev_attr_in3_alarm.dev_attr.attr,
431 &sensor_dev_attr_in4_alarm.dev_attr.attr,
432 &sensor_dev_attr_in5_alarm.dev_attr.attr,
433 &sensor_dev_attr_in6_alarm.dev_attr.attr,
434 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
435 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
436 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
437 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
438 NULL
439};
440
441static const struct attribute_group lm80_group = {
442 .attrs = lm80_attributes,
443};
444
445/* Return 0 if detection is successful, -ENODEV otherwise */
446static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
447{
448 struct i2c_adapter *adapter = client->adapter;
449 int i, cur;
450
451 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
452 return -ENODEV;
453
454 /* Now, we do the remaining detection. It is lousy. */
455 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
456 return -ENODEV;
457 for (i = 0x2a; i <= 0x3d; i++) {
458 cur = i2c_smbus_read_byte_data(client, i);
459 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
460 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
461 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
462 return -ENODEV;
463 }
464
465 strlcpy(info->type, "lm80", I2C_NAME_SIZE);
466
467 return 0;
468}
469
470static int lm80_probe(struct i2c_client *client,
471 const struct i2c_device_id *id)
472{
473 struct lm80_data *data;
474 int err;
475
476 data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
477 if (!data) {
478 err = -ENOMEM;
479 goto exit;
480 }
481
482 i2c_set_clientdata(client, data);
483 mutex_init(&data->update_lock);
484
485 /* Initialize the LM80 chip */
486 lm80_init_client(client);
487
488 /* A few vars need to be filled upon startup */
489 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
490 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
491
492 /* Register sysfs hooks */
493 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
494 goto error_free;
495
496 data->hwmon_dev = hwmon_device_register(&client->dev);
497 if (IS_ERR(data->hwmon_dev)) {
498 err = PTR_ERR(data->hwmon_dev);
499 goto error_remove;
500 }
501
502 return 0;
503
504error_remove:
505 sysfs_remove_group(&client->dev.kobj, &lm80_group);
506error_free:
507 kfree(data);
508exit:
509 return err;
510}
511
512static int lm80_remove(struct i2c_client *client)
513{
514 struct lm80_data *data = i2c_get_clientdata(client);
515
516 hwmon_device_unregister(data->hwmon_dev);
517 sysfs_remove_group(&client->dev.kobj, &lm80_group);
518
519 kfree(data);
520 return 0;
521}
522
523static int lm80_read_value(struct i2c_client *client, u8 reg)
524{
525 return i2c_smbus_read_byte_data(client, reg);
526}
527
528static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
529{
530 return i2c_smbus_write_byte_data(client, reg, value);
531}
532
533/* Called when we have found a new LM80. */
534static void lm80_init_client(struct i2c_client *client)
535{
536 /* Reset all except Watchdog values and last conversion values
537 This sets fan-divs to 2, among others. This makes most other
538 initializations unnecessary */
539 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
540 /* Set 11-bit temperature resolution */
541 lm80_write_value(client, LM80_REG_RES, 0x08);
542
543 /* Start monitoring */
544 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
545}
546
547static struct lm80_data *lm80_update_device(struct device *dev)
548{
549 struct i2c_client *client = to_i2c_client(dev);
550 struct lm80_data *data = i2c_get_clientdata(client);
551 int i;
552
553 mutex_lock(&data->update_lock);
554
555 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
556 dev_dbg(&client->dev, "Starting lm80 update\n");
557 for (i = 0; i <= 6; i++) {
558 data->in[i] =
559 lm80_read_value(client, LM80_REG_IN(i));
560 data->in_min[i] =
561 lm80_read_value(client, LM80_REG_IN_MIN(i));
562 data->in_max[i] =
563 lm80_read_value(client, LM80_REG_IN_MAX(i));
564 }
565 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
566 data->fan_min[0] =
567 lm80_read_value(client, LM80_REG_FAN_MIN(1));
568 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
569 data->fan_min[1] =
570 lm80_read_value(client, LM80_REG_FAN_MIN(2));
571
572 data->temp =
573 (lm80_read_value(client, LM80_REG_TEMP) << 8) |
574 (lm80_read_value(client, LM80_REG_RES) & 0xf0);
575 data->temp_os_max =
576 lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
577 data->temp_os_hyst =
578 lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
579 data->temp_hot_max =
580 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
581 data->temp_hot_hyst =
582 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
583
584 i = lm80_read_value(client, LM80_REG_FANDIV);
585 data->fan_div[0] = (i >> 2) & 0x03;
586 data->fan_div[1] = (i >> 4) & 0x03;
587 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
588 (lm80_read_value(client, LM80_REG_ALARM2) << 8);
589 data->last_updated = jiffies;
590 data->valid = 1;
591 }
592
593 mutex_unlock(&data->update_lock);
594
595 return data;
596}
597
598static int __init sensors_lm80_init(void)
599{
600 return i2c_add_driver(&lm80_driver);
601}
602
603static void __exit sensors_lm80_exit(void)
604{
605 i2c_del_driver(&lm80_driver);
606}
607
608MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
609 "Philip Edelbrock <phil@netroedge.com>");
610MODULE_DESCRIPTION("LM80 driver");
611MODULE_LICENSE("GPL");
612
613module_init(sensors_lm80_init);
614module_exit(sensors_lm80_exit);