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#define LM96080_REG_CONV_RATE 0x07
64#define LM96080_REG_MAN_ID 0x3e
65#define LM96080_REG_DEV_ID 0x3f
66
67
68/*
69 * Conversions. Rounding and limit checking is only done on the TO_REG
70 * variants. Note that you should be a bit careful with which arguments
71 * these macros are called: arguments may be evaluated more than once.
72 * Fixing this is just not worth it.
73 */
74
75#define IN_TO_REG(val) (clamp_val(((val) + 5) / 10, 0, 255))
76#define IN_FROM_REG(val) ((val) * 10)
77
78static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
79{
80 if (rpm == 0)
81 return 255;
82 rpm = clamp_val(rpm, 1, 1000000);
83 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
84}
85
86#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
87 (val) == 255 ? 0 : 1350000/((div) * (val)))
88
89#define TEMP_FROM_REG(reg) ((reg) * 125 / 32)
90#define TEMP_TO_REG(temp) (DIV_ROUND_CLOSEST(clamp_val((temp), \
91 -128000, 127000), 1000) << 8)
92
93#define DIV_FROM_REG(val) (1 << (val))
94
95enum temp_index {
96 t_input = 0,
97 t_hot_max,
98 t_hot_hyst,
99 t_os_max,
100 t_os_hyst,
101 t_num_temp
102};
103
104static const u8 temp_regs[t_num_temp] = {
105 [t_input] = LM80_REG_TEMP,
106 [t_hot_max] = LM80_REG_TEMP_HOT_MAX,
107 [t_hot_hyst] = LM80_REG_TEMP_HOT_HYST,
108 [t_os_max] = LM80_REG_TEMP_OS_MAX,
109 [t_os_hyst] = LM80_REG_TEMP_OS_HYST,
110};
111
112enum in_index {
113 i_input = 0,
114 i_max,
115 i_min,
116 i_num_in
117};
118
119enum fan_index {
120 f_input,
121 f_min,
122 f_num_fan
123};
124
125/*
126 * Client data (each client gets its own)
127 */
128
129struct lm80_data {
130 struct i2c_client *client;
131 struct mutex update_lock;
132 char error; /* !=0 if error occurred during last update */
133 char valid; /* !=0 if following fields are valid */
134 unsigned long last_updated; /* In jiffies */
135
136 u8 in[i_num_in][7]; /* Register value, 1st index is enum in_index */
137 u8 fan[f_num_fan][2]; /* Register value, 1st index enum fan_index */
138 u8 fan_div[2]; /* Register encoding, shifted right */
139 s16 temp[t_num_temp]; /* Register values, normalized to 16 bit */
140 u16 alarms; /* Register encoding, combined */
141};
142
143static int lm80_read_value(struct i2c_client *client, u8 reg)
144{
145 return i2c_smbus_read_byte_data(client, reg);
146}
147
148static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
149{
150 return i2c_smbus_write_byte_data(client, reg, value);
151}
152
153/* Called when we have found a new LM80 and after read errors */
154static void lm80_init_client(struct i2c_client *client)
155{
156 /*
157 * Reset all except Watchdog values and last conversion values
158 * This sets fan-divs to 2, among others. This makes most other
159 * initializations unnecessary
160 */
161 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
162 /* Set 11-bit temperature resolution */
163 lm80_write_value(client, LM80_REG_RES, 0x08);
164
165 /* Start monitoring */
166 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
167}
168
169static struct lm80_data *lm80_update_device(struct device *dev)
170{
171 struct lm80_data *data = dev_get_drvdata(dev);
172 struct i2c_client *client = data->client;
173 int i;
174 int rv;
175 int prev_rv;
176 struct lm80_data *ret = data;
177
178 mutex_lock(&data->update_lock);
179
180 if (data->error)
181 lm80_init_client(client);
182
183 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
184 dev_dbg(dev, "Starting lm80 update\n");
185 for (i = 0; i <= 6; i++) {
186 rv = lm80_read_value(client, LM80_REG_IN(i));
187 if (rv < 0)
188 goto abort;
189 data->in[i_input][i] = rv;
190
191 rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
192 if (rv < 0)
193 goto abort;
194 data->in[i_min][i] = rv;
195
196 rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
197 if (rv < 0)
198 goto abort;
199 data->in[i_max][i] = rv;
200 }
201
202 rv = lm80_read_value(client, LM80_REG_FAN1);
203 if (rv < 0)
204 goto abort;
205 data->fan[f_input][0] = rv;
206
207 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
208 if (rv < 0)
209 goto abort;
210 data->fan[f_min][0] = rv;
211
212 rv = lm80_read_value(client, LM80_REG_FAN2);
213 if (rv < 0)
214 goto abort;
215 data->fan[f_input][1] = rv;
216
217 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
218 if (rv < 0)
219 goto abort;
220 data->fan[f_min][1] = rv;
221
222 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
223 if (rv < 0)
224 goto abort;
225 rv = lm80_read_value(client, LM80_REG_RES);
226 if (rv < 0)
227 goto abort;
228 data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0);
229
230 for (i = t_input + 1; i < t_num_temp; i++) {
231 rv = lm80_read_value(client, temp_regs[i]);
232 if (rv < 0)
233 goto abort;
234 data->temp[i] = rv << 8;
235 }
236
237 rv = lm80_read_value(client, LM80_REG_FANDIV);
238 if (rv < 0)
239 goto abort;
240 data->fan_div[0] = (rv >> 2) & 0x03;
241 data->fan_div[1] = (rv >> 4) & 0x03;
242
243 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
244 if (rv < 0)
245 goto abort;
246 rv = lm80_read_value(client, LM80_REG_ALARM2);
247 if (rv < 0)
248 goto abort;
249 data->alarms = prev_rv + (rv << 8);
250
251 data->last_updated = jiffies;
252 data->valid = 1;
253 data->error = 0;
254 }
255 goto done;
256
257abort:
258 ret = ERR_PTR(rv);
259 data->valid = 0;
260 data->error = 1;
261
262done:
263 mutex_unlock(&data->update_lock);
264
265 return ret;
266}
267
268/*
269 * Sysfs stuff
270 */
271
272static ssize_t in_show(struct device *dev, struct device_attribute *attr,
273 char *buf)
274{
275 struct lm80_data *data = lm80_update_device(dev);
276 int index = to_sensor_dev_attr_2(attr)->index;
277 int nr = to_sensor_dev_attr_2(attr)->nr;
278
279 if (IS_ERR(data))
280 return PTR_ERR(data);
281 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr][index]));
282}
283
284static ssize_t in_store(struct device *dev, struct device_attribute *attr,
285 const char *buf, size_t count)
286{
287 struct lm80_data *data = dev_get_drvdata(dev);
288 struct i2c_client *client = data->client;
289 int index = to_sensor_dev_attr_2(attr)->index;
290 int nr = to_sensor_dev_attr_2(attr)->nr;
291 long val;
292 u8 reg;
293 int err = kstrtol(buf, 10, &val);
294 if (err < 0)
295 return err;
296
297 reg = nr == i_min ? LM80_REG_IN_MIN(index) : LM80_REG_IN_MAX(index);
298
299 mutex_lock(&data->update_lock);
300 data->in[nr][index] = IN_TO_REG(val);
301 lm80_write_value(client, reg, data->in[nr][index]);
302 mutex_unlock(&data->update_lock);
303 return count;
304}
305
306static ssize_t fan_show(struct device *dev, struct device_attribute *attr,
307 char *buf)
308{
309 int index = to_sensor_dev_attr_2(attr)->index;
310 int nr = to_sensor_dev_attr_2(attr)->nr;
311 struct lm80_data *data = lm80_update_device(dev);
312 if (IS_ERR(data))
313 return PTR_ERR(data);
314 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr][index],
315 DIV_FROM_REG(data->fan_div[index])));
316}
317
318static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
319 char *buf)
320{
321 int nr = to_sensor_dev_attr(attr)->index;
322 struct lm80_data *data = lm80_update_device(dev);
323 if (IS_ERR(data))
324 return PTR_ERR(data);
325 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
326}
327
328static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
329 const char *buf, size_t count)
330{
331 int index = to_sensor_dev_attr_2(attr)->index;
332 int nr = to_sensor_dev_attr_2(attr)->nr;
333 struct lm80_data *data = dev_get_drvdata(dev);
334 struct i2c_client *client = data->client;
335 unsigned long val;
336 int err = kstrtoul(buf, 10, &val);
337 if (err < 0)
338 return err;
339
340 mutex_lock(&data->update_lock);
341 data->fan[nr][index] = FAN_TO_REG(val,
342 DIV_FROM_REG(data->fan_div[index]));
343 lm80_write_value(client, LM80_REG_FAN_MIN(index + 1),
344 data->fan[nr][index]);
345 mutex_unlock(&data->update_lock);
346 return count;
347}
348
349/*
350 * Note: we save and restore the fan minimum here, because its value is
351 * determined in part by the fan divisor. This follows the principle of
352 * least surprise; the user doesn't expect the fan minimum to change just
353 * because the divisor changed.
354 */
355static ssize_t fan_div_store(struct device *dev,
356 struct device_attribute *attr, const char *buf,
357 size_t count)
358{
359 int nr = to_sensor_dev_attr(attr)->index;
360 struct lm80_data *data = dev_get_drvdata(dev);
361 struct i2c_client *client = data->client;
362 unsigned long min, val;
363 u8 reg;
364 int rv;
365
366 rv = kstrtoul(buf, 10, &val);
367 if (rv < 0)
368 return rv;
369
370 /* Save fan_min */
371 mutex_lock(&data->update_lock);
372 min = FAN_FROM_REG(data->fan[f_min][nr],
373 DIV_FROM_REG(data->fan_div[nr]));
374
375 switch (val) {
376 case 1:
377 data->fan_div[nr] = 0;
378 break;
379 case 2:
380 data->fan_div[nr] = 1;
381 break;
382 case 4:
383 data->fan_div[nr] = 2;
384 break;
385 case 8:
386 data->fan_div[nr] = 3;
387 break;
388 default:
389 dev_err(dev,
390 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
391 val);
392 mutex_unlock(&data->update_lock);
393 return -EINVAL;
394 }
395
396 rv = lm80_read_value(client, LM80_REG_FANDIV);
397 if (rv < 0) {
398 mutex_unlock(&data->update_lock);
399 return rv;
400 }
401 reg = (rv & ~(3 << (2 * (nr + 1))))
402 | (data->fan_div[nr] << (2 * (nr + 1)));
403 lm80_write_value(client, LM80_REG_FANDIV, reg);
404
405 /* Restore fan_min */
406 data->fan[f_min][nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
407 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1),
408 data->fan[f_min][nr]);
409 mutex_unlock(&data->update_lock);
410
411 return count;
412}
413
414static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
415 char *buf)
416{
417 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
418 struct lm80_data *data = lm80_update_device(dev);
419 if (IS_ERR(data))
420 return PTR_ERR(data);
421 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
422}
423
424static ssize_t temp_store(struct device *dev,
425 struct device_attribute *devattr, const char *buf,
426 size_t count)
427{
428 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
429 struct lm80_data *data = dev_get_drvdata(dev);
430 struct i2c_client *client = data->client;
431 int nr = attr->index;
432 long val;
433 int err = kstrtol(buf, 10, &val);
434 if (err < 0)
435 return err;
436
437 mutex_lock(&data->update_lock);
438 data->temp[nr] = TEMP_TO_REG(val);
439 lm80_write_value(client, temp_regs[nr], data->temp[nr] >> 8);
440 mutex_unlock(&data->update_lock);
441 return count;
442}
443
444static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
445 char *buf)
446{
447 struct lm80_data *data = lm80_update_device(dev);
448 if (IS_ERR(data))
449 return PTR_ERR(data);
450 return sprintf(buf, "%u\n", data->alarms);
451}
452
453static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
454 char *buf)
455{
456 int bitnr = to_sensor_dev_attr(attr)->index;
457 struct lm80_data *data = lm80_update_device(dev);
458 if (IS_ERR(data))
459 return PTR_ERR(data);
460 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
461}
462
463static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, i_min, 0);
464static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, i_min, 1);
465static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, i_min, 2);
466static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, i_min, 3);
467static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, i_min, 4);
468static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, i_min, 5);
469static SENSOR_DEVICE_ATTR_2_RW(in6_min, in, i_min, 6);
470static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, i_max, 0);
471static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, i_max, 1);
472static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, i_max, 2);
473static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, i_max, 3);
474static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, i_max, 4);
475static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, i_max, 5);
476static SENSOR_DEVICE_ATTR_2_RW(in6_max, in, i_max, 6);
477static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, i_input, 0);
478static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, i_input, 1);
479static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, i_input, 2);
480static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, i_input, 3);
481static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, i_input, 4);
482static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, i_input, 5);
483static SENSOR_DEVICE_ATTR_2_RO(in6_input, in, i_input, 6);
484static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, f_min, 0);
485static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, f_min, 1);
486static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, f_input, 0);
487static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, f_input, 1);
488static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
489static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
490static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
491static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_hot_max);
492static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, t_hot_hyst);
493static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_os_max);
494static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp, t_os_hyst);
495static DEVICE_ATTR_RO(alarms);
496static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
497static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
498static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
499static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
500static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 4);
501static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 5);
502static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
503static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 10);
504static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 11);
505static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 8);
506static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 13);
507
508/*
509 * Real code
510 */
511
512static struct attribute *lm80_attrs[] = {
513 &sensor_dev_attr_in0_min.dev_attr.attr,
514 &sensor_dev_attr_in1_min.dev_attr.attr,
515 &sensor_dev_attr_in2_min.dev_attr.attr,
516 &sensor_dev_attr_in3_min.dev_attr.attr,
517 &sensor_dev_attr_in4_min.dev_attr.attr,
518 &sensor_dev_attr_in5_min.dev_attr.attr,
519 &sensor_dev_attr_in6_min.dev_attr.attr,
520 &sensor_dev_attr_in0_max.dev_attr.attr,
521 &sensor_dev_attr_in1_max.dev_attr.attr,
522 &sensor_dev_attr_in2_max.dev_attr.attr,
523 &sensor_dev_attr_in3_max.dev_attr.attr,
524 &sensor_dev_attr_in4_max.dev_attr.attr,
525 &sensor_dev_attr_in5_max.dev_attr.attr,
526 &sensor_dev_attr_in6_max.dev_attr.attr,
527 &sensor_dev_attr_in0_input.dev_attr.attr,
528 &sensor_dev_attr_in1_input.dev_attr.attr,
529 &sensor_dev_attr_in2_input.dev_attr.attr,
530 &sensor_dev_attr_in3_input.dev_attr.attr,
531 &sensor_dev_attr_in4_input.dev_attr.attr,
532 &sensor_dev_attr_in5_input.dev_attr.attr,
533 &sensor_dev_attr_in6_input.dev_attr.attr,
534 &sensor_dev_attr_fan1_min.dev_attr.attr,
535 &sensor_dev_attr_fan2_min.dev_attr.attr,
536 &sensor_dev_attr_fan1_input.dev_attr.attr,
537 &sensor_dev_attr_fan2_input.dev_attr.attr,
538 &sensor_dev_attr_fan1_div.dev_attr.attr,
539 &sensor_dev_attr_fan2_div.dev_attr.attr,
540 &sensor_dev_attr_temp1_input.dev_attr.attr,
541 &sensor_dev_attr_temp1_max.dev_attr.attr,
542 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
543 &sensor_dev_attr_temp1_crit.dev_attr.attr,
544 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
545 &dev_attr_alarms.attr,
546 &sensor_dev_attr_in0_alarm.dev_attr.attr,
547 &sensor_dev_attr_in1_alarm.dev_attr.attr,
548 &sensor_dev_attr_in2_alarm.dev_attr.attr,
549 &sensor_dev_attr_in3_alarm.dev_attr.attr,
550 &sensor_dev_attr_in4_alarm.dev_attr.attr,
551 &sensor_dev_attr_in5_alarm.dev_attr.attr,
552 &sensor_dev_attr_in6_alarm.dev_attr.attr,
553 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
554 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
555 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
556 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
557 NULL
558};
559ATTRIBUTE_GROUPS(lm80);
560
561/* Return 0 if detection is successful, -ENODEV otherwise */
562static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
563{
564 struct i2c_adapter *adapter = client->adapter;
565 int i, cur, man_id, dev_id;
566 const char *name = NULL;
567
568 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
569 return -ENODEV;
570
571 /* First check for unused bits, common to both chip types */
572 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
573 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
574 return -ENODEV;
575
576 /*
577 * The LM96080 has manufacturer and stepping/die rev registers so we
578 * can just check that. The LM80 does not have such registers so we
579 * have to use a more expensive trick.
580 */
581 man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
582 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
583 if (man_id == 0x01 && dev_id == 0x08) {
584 /* Check more unused bits for confirmation */
585 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
586 return -ENODEV;
587
588 name = "lm96080";
589 } else {
590 /* Check 6-bit addressing */
591 for (i = 0x2a; i <= 0x3d; i++) {
592 cur = i2c_smbus_read_byte_data(client, i);
593 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
594 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
595 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
596 return -ENODEV;
597 }
598
599 name = "lm80";
600 }
601
602 strlcpy(info->type, name, I2C_NAME_SIZE);
603
604 return 0;
605}
606
607static int lm80_probe(struct i2c_client *client,
608 const struct i2c_device_id *id)
609{
610 struct device *dev = &client->dev;
611 struct device *hwmon_dev;
612 struct lm80_data *data;
613 int rv;
614
615 data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
616 if (!data)
617 return -ENOMEM;
618
619 data->client = client;
620 mutex_init(&data->update_lock);
621
622 /* Initialize the LM80 chip */
623 lm80_init_client(client);
624
625 /* A few vars need to be filled upon startup */
626 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
627 if (rv < 0)
628 return rv;
629 data->fan[f_min][0] = rv;
630 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
631 if (rv < 0)
632 return rv;
633 data->fan[f_min][1] = rv;
634
635 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
636 data, lm80_groups);
637
638 return PTR_ERR_OR_ZERO(hwmon_dev);
639}
640
641/*
642 * Driver data (common to all clients)
643 */
644
645static const struct i2c_device_id lm80_id[] = {
646 { "lm80", 0 },
647 { "lm96080", 1 },
648 { }
649};
650MODULE_DEVICE_TABLE(i2c, lm80_id);
651
652static struct i2c_driver lm80_driver = {
653 .class = I2C_CLASS_HWMON,
654 .driver = {
655 .name = "lm80",
656 },
657 .probe = lm80_probe,
658 .id_table = lm80_id,
659 .detect = lm80_detect,
660 .address_list = normal_i2c,
661};
662
663module_i2c_driver(lm80_driver);
664
665MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
666 "Philip Edelbrock <phil@netroedge.com>");
667MODULE_DESCRIPTION("LM80 driver");
668MODULE_LICENSE("GPL");
669