1/*
2 * lm87.c
3 *
4 * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl>
5 * Philip Edelbrock <phil@netroedge.com>
6 * Stephen Rousset <stephen.rousset@rocketlogix.com>
7 * Dan Eaton <dan.eaton@rocketlogix.com>
8 * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de>
9 *
10 * Original port to Linux 2.6 by Jeff Oliver.
11 *
12 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
13 * to 8 voltages (including its own power source), up to three temperatures
14 * (its own plus up to two external ones) and up to two fans. The default
15 * configuration is 6 voltages, two temperatures and two fans (see below).
16 * Voltages are scaled internally with ratios such that the nominal value of
17 * each voltage correspond to a register value of 192 (which means a
18 * resolution of about 0.5% of the nominal value). Temperature values are
19 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
20 * datasheet can be obtained from National's website at:
21 * http://www.national.com/pf/LM/LM87.html
22 *
23 * Some functions share pins, so not all functions are available at the same
24 * time. Which are depends on the hardware setup. This driver normally
25 * assumes that firmware configured the chip correctly. Where this is not
26 * the case, platform code must set the I2C client's platform_data to point
27 * to a u8 value to be written to the channel register.
28 * For reference, here is the list of exclusive functions:
29 * - in0+in5 (default) or temp3
30 * - fan1 (default) or in6
31 * - fan2 (default) or in7
32 * - VID lines (default) or IRQ lines (not handled by this driver)
33 *
34 * The LM87 additionally features an analog output, supposedly usable to
35 * control the speed of a fan. All new chips use pulse width modulation
36 * instead. The LM87 is the only hardware monitoring chipset I know of
37 * which uses amplitude modulation. Be careful when using this feature.
38 *
39 * This driver also supports the ADM1024, a sensor chip made by Analog
40 * Devices. That chip is fully compatible with the LM87. Complete
41 * datasheet can be obtained from Analog's website at:
42 * http://www.analog.com/en/prod/0,2877,ADM1024,00.html
43 *
44 * This program is free software; you can redistribute it and/or modify
45 * it under the terms of the GNU General Public License as published by
46 * the Free Software Foundation; either version 2 of the License, or
47 * (at your option) any later version.
48 *
49 * This program is distributed in the hope that it will be useful,
50 * but WITHOUT ANY WARRANTY; without even the implied warranty of
51 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
52 * GNU General Public License for more details.
53 *
54 * You should have received a copy of the GNU General Public License
55 * along with this program; if not, write to the Free Software
56 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
57 */
58
59#include <linux/module.h>
60#include <linux/init.h>
61#include <linux/slab.h>
62#include <linux/jiffies.h>
63#include <linux/i2c.h>
64#include <linux/hwmon.h>
65#include <linux/hwmon-sysfs.h>
66#include <linux/hwmon-vid.h>
67#include <linux/err.h>
68#include <linux/mutex.h>
69#include <linux/regulator/consumer.h>
70
71/*
72 * Addresses to scan
73 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
74 */
75
76static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
77
78/*
79 * The LM87 registers
80 */
81
82/* nr in 0..5 */
83#define LM87_REG_IN(nr) (0x20 + (nr))
84#define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2)
85#define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2)
86/* nr in 0..1 */
87#define LM87_REG_AIN(nr) (0x28 + (nr))
88#define LM87_REG_AIN_MIN(nr) (0x1A + (nr))
89#define LM87_REG_AIN_MAX(nr) (0x3B + (nr))
90
91static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
92static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
93static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
94
95#define LM87_REG_TEMP_HW_INT_LOCK 0x13
96#define LM87_REG_TEMP_HW_EXT_LOCK 0x14
97#define LM87_REG_TEMP_HW_INT 0x17
98#define LM87_REG_TEMP_HW_EXT 0x18
99
100/* nr in 0..1 */
101#define LM87_REG_FAN(nr) (0x28 + (nr))
102#define LM87_REG_FAN_MIN(nr) (0x3B + (nr))
103#define LM87_REG_AOUT 0x19
104
105#define LM87_REG_CONFIG 0x40
106#define LM87_REG_CHANNEL_MODE 0x16
107#define LM87_REG_VID_FAN_DIV 0x47
108#define LM87_REG_VID4 0x49
109
110#define LM87_REG_ALARMS1 0x41
111#define LM87_REG_ALARMS2 0x42
112
113#define LM87_REG_COMPANY_ID 0x3E
114#define LM87_REG_REVISION 0x3F
115
116/*
117 * Conversions and various macros
118 * The LM87 uses signed 8-bit values for temperatures.
119 */
120
121#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
122#define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
123 (val) >= (scale) * 255 / 192 ? 255 : \
124 ((val) * 192 + (scale) / 2) / (scale))
125
126#define TEMP_FROM_REG(reg) ((reg) * 1000)
127#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
128 (val) >= 126500 ? 127 : \
129 (((val) < 0 ? (val) - 500 : \
130 (val) + 500) / 1000))
131
132#define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \
133 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
134#define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \
135 (1350000 + (val)*(div) / 2) / ((val) * (div)))
136
137#define FAN_DIV_FROM_REG(reg) (1 << (reg))
138
139/* analog out is 9.80mV/LSB */
140#define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10)
141#define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \
142 (val) >= 2500 ? 255 : \
143 ((val) * 10 + 49) / 98)
144
145/* nr in 0..1 */
146#define CHAN_NO_FAN(nr) (1 << (nr))
147#define CHAN_TEMP3 (1 << 2)
148#define CHAN_VCC_5V (1 << 3)
149#define CHAN_NO_VID (1 << 7)
150
151/*
152 * Client data (each client gets its own)
153 */
154
155struct lm87_data {
156 struct mutex update_lock;
157 char valid; /* zero until following fields are valid */
158 unsigned long last_updated; /* In jiffies */
159
160 u8 channel; /* register value */
161 u8 config; /* original register value */
162
163 u8 in[8]; /* register value */
164 u8 in_max[8]; /* register value */
165 u8 in_min[8]; /* register value */
166 u16 in_scale[8];
167
168 s8 temp[3]; /* register value */
169 s8 temp_high[3]; /* register value */
170 s8 temp_low[3]; /* register value */
171 s8 temp_crit_int; /* min of two register values */
172 s8 temp_crit_ext; /* min of two register values */
173
174 u8 fan[2]; /* register value */
175 u8 fan_min[2]; /* register value */
176 u8 fan_div[2]; /* register value, shifted right */
177 u8 aout; /* register value */
178
179 u16 alarms; /* register values, combined */
180 u8 vid; /* register values, combined */
181 u8 vrm;
182
183 const struct attribute_group *attr_groups[6];
184};
185
186static inline int lm87_read_value(struct i2c_client *client, u8 reg)
187{
188 return i2c_smbus_read_byte_data(client, reg);
189}
190
191static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
192{
193 return i2c_smbus_write_byte_data(client, reg, value);
194}
195
196static struct lm87_data *lm87_update_device(struct device *dev)
197{
198 struct i2c_client *client = dev_get_drvdata(dev);
199 struct lm87_data *data = i2c_get_clientdata(client);
200
201 mutex_lock(&data->update_lock);
202
203 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
204 int i, j;
205
206 dev_dbg(&client->dev, "Updating data.\n");
207
208 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
209 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
210 for (; i < j; i++) {
211 data->in[i] = lm87_read_value(client,
212 LM87_REG_IN(i));
213 data->in_min[i] = lm87_read_value(client,
214 LM87_REG_IN_MIN(i));
215 data->in_max[i] = lm87_read_value(client,
216 LM87_REG_IN_MAX(i));
217 }
218
219 for (i = 0; i < 2; i++) {
220 if (data->channel & CHAN_NO_FAN(i)) {
221 data->in[6+i] = lm87_read_value(client,
222 LM87_REG_AIN(i));
223 data->in_max[6+i] = lm87_read_value(client,
224 LM87_REG_AIN_MAX(i));
225 data->in_min[6+i] = lm87_read_value(client,
226 LM87_REG_AIN_MIN(i));
227
228 } else {
229 data->fan[i] = lm87_read_value(client,
230 LM87_REG_FAN(i));
231 data->fan_min[i] = lm87_read_value(client,
232 LM87_REG_FAN_MIN(i));
233 }
234 }
235
236 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
237 for (i = 0 ; i < j; i++) {
238 data->temp[i] = lm87_read_value(client,
239 LM87_REG_TEMP[i]);
240 data->temp_high[i] = lm87_read_value(client,
241 LM87_REG_TEMP_HIGH[i]);
242 data->temp_low[i] = lm87_read_value(client,
243 LM87_REG_TEMP_LOW[i]);
244 }
245
246 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
247 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
248 data->temp_crit_int = min(i, j);
249
250 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
251 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
252 data->temp_crit_ext = min(i, j);
253
254 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
255 data->fan_div[0] = (i >> 4) & 0x03;
256 data->fan_div[1] = (i >> 6) & 0x03;
257 data->vid = (i & 0x0F)
258 | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
259 << 4;
260
261 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
262 | (lm87_read_value(client, LM87_REG_ALARMS2)
263 << 8);
264 data->aout = lm87_read_value(client, LM87_REG_AOUT);
265
266 data->last_updated = jiffies;
267 data->valid = 1;
268 }
269
270 mutex_unlock(&data->update_lock);
271
272 return data;
273}
274
275/*
276 * Sysfs stuff
277 */
278
279static ssize_t show_in_input(struct device *dev, struct device_attribute *attr,
280 char *buf)
281{
282 struct lm87_data *data = lm87_update_device(dev);
283 int nr = to_sensor_dev_attr(attr)->index;
284
285 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
286 data->in_scale[nr]));
287}
288
289static ssize_t show_in_min(struct device *dev,
290 struct device_attribute *attr, char *buf)
291{
292 struct lm87_data *data = lm87_update_device(dev);
293 int nr = to_sensor_dev_attr(attr)->index;
294
295 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
296 data->in_scale[nr]));
297}
298
299static ssize_t show_in_max(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
302 struct lm87_data *data = lm87_update_device(dev);
303 int nr = to_sensor_dev_attr(attr)->index;
304
305 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
306 data->in_scale[nr]));
307}
308
309static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
310 const char *buf, size_t count)
311{
312 struct i2c_client *client = dev_get_drvdata(dev);
313 struct lm87_data *data = i2c_get_clientdata(client);
314 int nr = to_sensor_dev_attr(attr)->index;
315 long val;
316 int err;
317
318 err = kstrtol(buf, 10, &val);
319 if (err)
320 return err;
321
322 mutex_lock(&data->update_lock);
323 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
324 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
325 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
326 mutex_unlock(&data->update_lock);
327 return count;
328}
329
330static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
331 const char *buf, size_t count)
332{
333 struct i2c_client *client = dev_get_drvdata(dev);
334 struct lm87_data *data = i2c_get_clientdata(client);
335 int nr = to_sensor_dev_attr(attr)->index;
336 long val;
337 int err;
338
339 err = kstrtol(buf, 10, &val);
340 if (err)
341 return err;
342
343 mutex_lock(&data->update_lock);
344 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
345 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
346 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
347 mutex_unlock(&data->update_lock);
348 return count;
349}
350
351#define set_in(offset) \
352static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
353 show_in_input, NULL, offset); \
354static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
355 show_in_min, set_in_min, offset); \
356static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
357 show_in_max, set_in_max, offset)
358set_in(0);
359set_in(1);
360set_in(2);
361set_in(3);
362set_in(4);
363set_in(5);
364set_in(6);
365set_in(7);
366
367static ssize_t show_temp_input(struct device *dev,
368 struct device_attribute *attr, char *buf)
369{
370 struct lm87_data *data = lm87_update_device(dev);
371 int nr = to_sensor_dev_attr(attr)->index;
372
373 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
374}
375
376static ssize_t show_temp_low(struct device *dev,
377 struct device_attribute *attr, char *buf)
378{
379 struct lm87_data *data = lm87_update_device(dev);
380 int nr = to_sensor_dev_attr(attr)->index;
381
382 return sprintf(buf, "%d\n",
383 TEMP_FROM_REG(data->temp_low[nr]));
384}
385
386static ssize_t show_temp_high(struct device *dev,
387 struct device_attribute *attr, char *buf)
388{
389 struct lm87_data *data = lm87_update_device(dev);
390 int nr = to_sensor_dev_attr(attr)->index;
391
392 return sprintf(buf, "%d\n",
393 TEMP_FROM_REG(data->temp_high[nr]));
394}
395
396static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
397 const char *buf, size_t count)
398{
399 struct i2c_client *client = dev_get_drvdata(dev);
400 struct lm87_data *data = i2c_get_clientdata(client);
401 int nr = to_sensor_dev_attr(attr)->index;
402 long val;
403 int err;
404
405 err = kstrtol(buf, 10, &val);
406 if (err)
407 return err;
408
409 mutex_lock(&data->update_lock);
410 data->temp_low[nr] = TEMP_TO_REG(val);
411 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
412 mutex_unlock(&data->update_lock);
413 return count;
414}
415
416static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr,
417 const char *buf, size_t count)
418{
419 struct i2c_client *client = dev_get_drvdata(dev);
420 struct lm87_data *data = i2c_get_clientdata(client);
421 int nr = to_sensor_dev_attr(attr)->index;
422 long val;
423 int err;
424
425 err = kstrtol(buf, 10, &val);
426 if (err)
427 return err;
428
429 mutex_lock(&data->update_lock);
430 data->temp_high[nr] = TEMP_TO_REG(val);
431 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
432 mutex_unlock(&data->update_lock);
433 return count;
434}
435
436#define set_temp(offset) \
437static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
438 show_temp_input, NULL, offset - 1); \
439static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
440 show_temp_high, set_temp_high, offset - 1); \
441static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
442 show_temp_low, set_temp_low, offset - 1)
443set_temp(1);
444set_temp(2);
445set_temp(3);
446
447static ssize_t temp1_crit_show(struct device *dev,
448 struct device_attribute *attr, char *buf)
449{
450 struct lm87_data *data = lm87_update_device(dev);
451 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
452}
453
454static ssize_t temp2_crit_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
456{
457 struct lm87_data *data = lm87_update_device(dev);
458 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
459}
460
461static DEVICE_ATTR_RO(temp1_crit);
462static DEVICE_ATTR_RO(temp2_crit);
463static DEVICE_ATTR(temp3_crit, S_IRUGO, temp2_crit_show, NULL);
464
465static ssize_t show_fan_input(struct device *dev,
466 struct device_attribute *attr, char *buf)
467{
468 struct lm87_data *data = lm87_update_device(dev);
469 int nr = to_sensor_dev_attr(attr)->index;
470
471 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
472 FAN_DIV_FROM_REG(data->fan_div[nr])));
473}
474
475static ssize_t show_fan_min(struct device *dev,
476 struct device_attribute *attr, char *buf)
477{
478 struct lm87_data *data = lm87_update_device(dev);
479 int nr = to_sensor_dev_attr(attr)->index;
480
481 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
482 FAN_DIV_FROM_REG(data->fan_div[nr])));
483}
484
485static ssize_t show_fan_div(struct device *dev,
486 struct device_attribute *attr, char *buf)
487{
488 struct lm87_data *data = lm87_update_device(dev);
489 int nr = to_sensor_dev_attr(attr)->index;
490
491 return sprintf(buf, "%d\n",
492 FAN_DIV_FROM_REG(data->fan_div[nr]));
493}
494
495static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
496 const char *buf, size_t count)
497{
498 struct i2c_client *client = dev_get_drvdata(dev);
499 struct lm87_data *data = i2c_get_clientdata(client);
500 int nr = to_sensor_dev_attr(attr)->index;
501 long val;
502 int err;
503
504 err = kstrtol(buf, 10, &val);
505 if (err)
506 return err;
507
508 mutex_lock(&data->update_lock);
509 data->fan_min[nr] = FAN_TO_REG(val,
510 FAN_DIV_FROM_REG(data->fan_div[nr]));
511 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
512 mutex_unlock(&data->update_lock);
513 return count;
514}
515
516/*
517 * Note: we save and restore the fan minimum here, because its value is
518 * determined in part by the fan clock divider. This follows the principle
519 * of least surprise; the user doesn't expect the fan minimum to change just
520 * because the divider changed.
521 */
522static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
523 const char *buf, size_t count)
524{
525 struct i2c_client *client = dev_get_drvdata(dev);
526 struct lm87_data *data = i2c_get_clientdata(client);
527 int nr = to_sensor_dev_attr(attr)->index;
528 long val;
529 int err;
530 unsigned long min;
531 u8 reg;
532
533 err = kstrtol(buf, 10, &val);
534 if (err)
535 return err;
536
537 mutex_lock(&data->update_lock);
538 min = FAN_FROM_REG(data->fan_min[nr],
539 FAN_DIV_FROM_REG(data->fan_div[nr]));
540
541 switch (val) {
542 case 1:
543 data->fan_div[nr] = 0;
544 break;
545 case 2:
546 data->fan_div[nr] = 1;
547 break;
548 case 4:
549 data->fan_div[nr] = 2;
550 break;
551 case 8:
552 data->fan_div[nr] = 3;
553 break;
554 default:
555 mutex_unlock(&data->update_lock);
556 return -EINVAL;
557 }
558
559 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
560 switch (nr) {
561 case 0:
562 reg = (reg & 0xCF) | (data->fan_div[0] << 4);
563 break;
564 case 1:
565 reg = (reg & 0x3F) | (data->fan_div[1] << 6);
566 break;
567 }
568 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
569
570 data->fan_min[nr] = FAN_TO_REG(min, val);
571 lm87_write_value(client, LM87_REG_FAN_MIN(nr),
572 data->fan_min[nr]);
573 mutex_unlock(&data->update_lock);
574
575 return count;
576}
577
578#define set_fan(offset) \
579static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
580 show_fan_input, NULL, offset - 1); \
581static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
582 show_fan_min, set_fan_min, offset - 1); \
583static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
584 show_fan_div, set_fan_div, offset - 1)
585set_fan(1);
586set_fan(2);
587
588static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
589 char *buf)
590{
591 struct lm87_data *data = lm87_update_device(dev);
592 return sprintf(buf, "%d\n", data->alarms);
593}
594static DEVICE_ATTR_RO(alarms);
595
596static ssize_t cpu0_vid_show(struct device *dev,
597 struct device_attribute *attr, char *buf)
598{
599 struct lm87_data *data = lm87_update_device(dev);
600 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
601}
602static DEVICE_ATTR_RO(cpu0_vid);
603
604static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
605 char *buf)
606{
607 struct lm87_data *data = dev_get_drvdata(dev);
608 return sprintf(buf, "%d\n", data->vrm);
609}
610static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
611 const char *buf, size_t count)
612{
613 struct lm87_data *data = dev_get_drvdata(dev);
614 unsigned long val;
615 int err;
616
617 err = kstrtoul(buf, 10, &val);
618 if (err)
619 return err;
620
621 if (val > 255)
622 return -EINVAL;
623
624 data->vrm = val;
625 return count;
626}
627static DEVICE_ATTR_RW(vrm);
628
629static ssize_t aout_output_show(struct device *dev,
630 struct device_attribute *attr, char *buf)
631{
632 struct lm87_data *data = lm87_update_device(dev);
633 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
634}
635static ssize_t aout_output_store(struct device *dev,
636 struct device_attribute *attr,
637 const char *buf, size_t count)
638{
639 struct i2c_client *client = dev_get_drvdata(dev);
640 struct lm87_data *data = i2c_get_clientdata(client);
641 long val;
642 int err;
643
644 err = kstrtol(buf, 10, &val);
645 if (err)
646 return err;
647
648 mutex_lock(&data->update_lock);
649 data->aout = AOUT_TO_REG(val);
650 lm87_write_value(client, LM87_REG_AOUT, data->aout);
651 mutex_unlock(&data->update_lock);
652 return count;
653}
654static DEVICE_ATTR_RW(aout_output);
655
656static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
657 char *buf)
658{
659 struct lm87_data *data = lm87_update_device(dev);
660 int bitnr = to_sensor_dev_attr(attr)->index;
661 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
662}
663static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
664static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
665static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
666static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
667static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
668static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
669static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
670static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
671static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
672static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
673static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
674static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
675static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
676static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
677static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
678
679/*
680 * Real code
681 */
682
683static struct attribute *lm87_attributes[] = {
684 &sensor_dev_attr_in1_input.dev_attr.attr,
685 &sensor_dev_attr_in1_min.dev_attr.attr,
686 &sensor_dev_attr_in1_max.dev_attr.attr,
687 &sensor_dev_attr_in1_alarm.dev_attr.attr,
688 &sensor_dev_attr_in2_input.dev_attr.attr,
689 &sensor_dev_attr_in2_min.dev_attr.attr,
690 &sensor_dev_attr_in2_max.dev_attr.attr,
691 &sensor_dev_attr_in2_alarm.dev_attr.attr,
692 &sensor_dev_attr_in3_input.dev_attr.attr,
693 &sensor_dev_attr_in3_min.dev_attr.attr,
694 &sensor_dev_attr_in3_max.dev_attr.attr,
695 &sensor_dev_attr_in3_alarm.dev_attr.attr,
696 &sensor_dev_attr_in4_input.dev_attr.attr,
697 &sensor_dev_attr_in4_min.dev_attr.attr,
698 &sensor_dev_attr_in4_max.dev_attr.attr,
699 &sensor_dev_attr_in4_alarm.dev_attr.attr,
700
701 &sensor_dev_attr_temp1_input.dev_attr.attr,
702 &sensor_dev_attr_temp1_max.dev_attr.attr,
703 &sensor_dev_attr_temp1_min.dev_attr.attr,
704 &dev_attr_temp1_crit.attr,
705 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
706 &sensor_dev_attr_temp2_input.dev_attr.attr,
707 &sensor_dev_attr_temp2_max.dev_attr.attr,
708 &sensor_dev_attr_temp2_min.dev_attr.attr,
709 &dev_attr_temp2_crit.attr,
710 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
711 &sensor_dev_attr_temp2_fault.dev_attr.attr,
712
713 &dev_attr_alarms.attr,
714 &dev_attr_aout_output.attr,
715
716 NULL
717};
718
719static const struct attribute_group lm87_group = {
720 .attrs = lm87_attributes,
721};
722
723static struct attribute *lm87_attributes_in6[] = {
724 &sensor_dev_attr_in6_input.dev_attr.attr,
725 &sensor_dev_attr_in6_min.dev_attr.attr,
726 &sensor_dev_attr_in6_max.dev_attr.attr,
727 &sensor_dev_attr_in6_alarm.dev_attr.attr,
728 NULL
729};
730
731static const struct attribute_group lm87_group_in6 = {
732 .attrs = lm87_attributes_in6,
733};
734
735static struct attribute *lm87_attributes_fan1[] = {
736 &sensor_dev_attr_fan1_input.dev_attr.attr,
737 &sensor_dev_attr_fan1_min.dev_attr.attr,
738 &sensor_dev_attr_fan1_div.dev_attr.attr,
739 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
740 NULL
741};
742
743static const struct attribute_group lm87_group_fan1 = {
744 .attrs = lm87_attributes_fan1,
745};
746
747static struct attribute *lm87_attributes_in7[] = {
748 &sensor_dev_attr_in7_input.dev_attr.attr,
749 &sensor_dev_attr_in7_min.dev_attr.attr,
750 &sensor_dev_attr_in7_max.dev_attr.attr,
751 &sensor_dev_attr_in7_alarm.dev_attr.attr,
752 NULL
753};
754
755static const struct attribute_group lm87_group_in7 = {
756 .attrs = lm87_attributes_in7,
757};
758
759static struct attribute *lm87_attributes_fan2[] = {
760 &sensor_dev_attr_fan2_input.dev_attr.attr,
761 &sensor_dev_attr_fan2_min.dev_attr.attr,
762 &sensor_dev_attr_fan2_div.dev_attr.attr,
763 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
764 NULL
765};
766
767static const struct attribute_group lm87_group_fan2 = {
768 .attrs = lm87_attributes_fan2,
769};
770
771static struct attribute *lm87_attributes_temp3[] = {
772 &sensor_dev_attr_temp3_input.dev_attr.attr,
773 &sensor_dev_attr_temp3_max.dev_attr.attr,
774 &sensor_dev_attr_temp3_min.dev_attr.attr,
775 &dev_attr_temp3_crit.attr,
776 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
777 &sensor_dev_attr_temp3_fault.dev_attr.attr,
778 NULL
779};
780
781static const struct attribute_group lm87_group_temp3 = {
782 .attrs = lm87_attributes_temp3,
783};
784
785static struct attribute *lm87_attributes_in0_5[] = {
786 &sensor_dev_attr_in0_input.dev_attr.attr,
787 &sensor_dev_attr_in0_min.dev_attr.attr,
788 &sensor_dev_attr_in0_max.dev_attr.attr,
789 &sensor_dev_attr_in0_alarm.dev_attr.attr,
790 &sensor_dev_attr_in5_input.dev_attr.attr,
791 &sensor_dev_attr_in5_min.dev_attr.attr,
792 &sensor_dev_attr_in5_max.dev_attr.attr,
793 &sensor_dev_attr_in5_alarm.dev_attr.attr,
794 NULL
795};
796
797static const struct attribute_group lm87_group_in0_5 = {
798 .attrs = lm87_attributes_in0_5,
799};
800
801static struct attribute *lm87_attributes_vid[] = {
802 &dev_attr_cpu0_vid.attr,
803 &dev_attr_vrm.attr,
804 NULL
805};
806
807static const struct attribute_group lm87_group_vid = {
808 .attrs = lm87_attributes_vid,
809};
810
811/* Return 0 if detection is successful, -ENODEV otherwise */
812static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
813{
814 struct i2c_adapter *adapter = client->adapter;
815 const char *name;
816 u8 cid, rev;
817
818 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
819 return -ENODEV;
820
821 if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
822 return -ENODEV;
823
824 /* Now, we do the remaining detection. */
825 cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
826 rev = lm87_read_value(client, LM87_REG_REVISION);
827
828 if (cid == 0x02 /* National Semiconductor */
829 && (rev >= 0x01 && rev <= 0x08))
830 name = "lm87";
831 else if (cid == 0x41 /* Analog Devices */
832 && (rev & 0xf0) == 0x10)
833 name = "adm1024";
834 else {
835 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
836 client->addr);
837 return -ENODEV;
838 }
839
840 strlcpy(info->type, name, I2C_NAME_SIZE);
841
842 return 0;
843}
844
845static void lm87_restore_config(void *arg)
846{
847 struct i2c_client *client = arg;
848 struct lm87_data *data = i2c_get_clientdata(client);
849
850 lm87_write_value(client, LM87_REG_CONFIG, data->config);
851}
852
853static int lm87_init_client(struct i2c_client *client)
854{
855 struct lm87_data *data = i2c_get_clientdata(client);
856 int rc;
857 struct device_node *of_node = client->dev.of_node;
858 u8 val = 0;
859 struct regulator *vcc = NULL;
860
861 if (of_node) {
862 if (of_property_read_bool(of_node, "has-temp3"))
863 val |= CHAN_TEMP3;
864 if (of_property_read_bool(of_node, "has-in6"))
865 val |= CHAN_NO_FAN(0);
866 if (of_property_read_bool(of_node, "has-in7"))
867 val |= CHAN_NO_FAN(1);
868 vcc = devm_regulator_get_optional(&client->dev, "vcc");
869 if (!IS_ERR(vcc)) {
870 if (regulator_get_voltage(vcc) == 5000000)
871 val |= CHAN_VCC_5V;
872 }
873 data->channel = val;
874 lm87_write_value(client,
875 LM87_REG_CHANNEL_MODE, data->channel);
876 } else if (dev_get_platdata(&client->dev)) {
877 data->channel = *(u8 *)dev_get_platdata(&client->dev);
878 lm87_write_value(client,
879 LM87_REG_CHANNEL_MODE, data->channel);
880 } else {
881 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
882 }
883 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
884
885 rc = devm_add_action(&client->dev, lm87_restore_config, client);
886 if (rc)
887 return rc;
888
889 if (!(data->config & 0x01)) {
890 int i;
891
892 /* Limits are left uninitialized after power-up */
893 for (i = 1; i < 6; i++) {
894 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
895 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
896 }
897 for (i = 0; i < 2; i++) {
898 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
899 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
900 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
901 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
902 }
903 if (data->channel & CHAN_TEMP3) {
904 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
905 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
906 } else {
907 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
908 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
909 }
910 }
911
912 /* Make sure Start is set and INT#_Clear is clear */
913 if ((data->config & 0x09) != 0x01)
914 lm87_write_value(client, LM87_REG_CONFIG,
915 (data->config & 0x77) | 0x01);
916 return 0;
917}
918
919static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
920{
921 struct lm87_data *data;
922 struct device *hwmon_dev;
923 int err;
924 unsigned int group_tail = 0;
925
926 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
927 if (!data)
928 return -ENOMEM;
929
930 i2c_set_clientdata(client, data);
931 mutex_init(&data->update_lock);
932
933 /* Initialize the LM87 chip */
934 err = lm87_init_client(client);
935 if (err)
936 return err;
937
938 data->in_scale[0] = 2500;
939 data->in_scale[1] = 2700;
940 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
941 data->in_scale[3] = 5000;
942 data->in_scale[4] = 12000;
943 data->in_scale[5] = 2700;
944 data->in_scale[6] = 1875;
945 data->in_scale[7] = 1875;
946
947 /*
948 * Construct the list of attributes, the list depends on the
949 * configuration of the chip
950 */
951 data->attr_groups[group_tail++] = &lm87_group;
952 if (data->channel & CHAN_NO_FAN(0))
953 data->attr_groups[group_tail++] = &lm87_group_in6;
954 else
955 data->attr_groups[group_tail++] = &lm87_group_fan1;
956
957 if (data->channel & CHAN_NO_FAN(1))
958 data->attr_groups[group_tail++] = &lm87_group_in7;
959 else
960 data->attr_groups[group_tail++] = &lm87_group_fan2;
961
962 if (data->channel & CHAN_TEMP3)
963 data->attr_groups[group_tail++] = &lm87_group_temp3;
964 else
965 data->attr_groups[group_tail++] = &lm87_group_in0_5;
966
967 if (!(data->channel & CHAN_NO_VID)) {
968 data->vrm = vid_which_vrm();
969 data->attr_groups[group_tail++] = &lm87_group_vid;
970 }
971
972 hwmon_dev = devm_hwmon_device_register_with_groups(
973 &client->dev, client->name, client, data->attr_groups);
974 return PTR_ERR_OR_ZERO(hwmon_dev);
975}
976
977/*
978 * Driver data (common to all clients)
979 */
980
981static const struct i2c_device_id lm87_id[] = {
982 { "lm87", 0 },
983 { "adm1024", 0 },
984 { }
985};
986MODULE_DEVICE_TABLE(i2c, lm87_id);
987
988static const struct of_device_id lm87_of_match[] = {
989 { .compatible = "ti,lm87" },
990 { .compatible = "adi,adm1024" },
991 { },
992};
993MODULE_DEVICE_TABLE(of, lm87_of_match);
994
995static struct i2c_driver lm87_driver = {
996 .class = I2C_CLASS_HWMON,
997 .driver = {
998 .name = "lm87",
999 .of_match_table = lm87_of_match,
1000 },
1001 .probe = lm87_probe,
1002 .id_table = lm87_id,
1003 .detect = lm87_detect,
1004 .address_list = normal_i2c,
1005};
1006
1007module_i2c_driver(lm87_driver);
1008
1009MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1010MODULE_DESCRIPTION("LM87 driver");
1011MODULE_LICENSE("GPL");
1012