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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
4 *
5 * Copyright (C) 2008, 2010 Pengutronix
6 *
7 * TODO: SPI, use power-down mode for suspend?, interrupt handling?
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/err.h>
14#include <linux/mutex.h>
15#include <linux/jiffies.h>
16#include <linux/i2c.h>
17#include <linux/hwmon.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/slab.h>
20
21#define ADT7411_REG_STAT_1 0x00
22#define ADT7411_STAT_1_INT_TEMP_HIGH BIT(0)
23#define ADT7411_STAT_1_INT_TEMP_LOW BIT(1)
24#define ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1 BIT(2)
25#define ADT7411_STAT_1_EXT_TEMP_LOW BIT(3)
26#define ADT7411_STAT_1_EXT_TEMP_FAULT BIT(4)
27#define ADT7411_STAT_1_AIN2 BIT(5)
28#define ADT7411_STAT_1_AIN3 BIT(6)
29#define ADT7411_STAT_1_AIN4 BIT(7)
30#define ADT7411_REG_STAT_2 0x01
31#define ADT7411_STAT_2_AIN5 BIT(0)
32#define ADT7411_STAT_2_AIN6 BIT(1)
33#define ADT7411_STAT_2_AIN7 BIT(2)
34#define ADT7411_STAT_2_AIN8 BIT(3)
35#define ADT7411_STAT_2_VDD BIT(4)
36#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
37#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
38#define ADT7411_REG_VDD_MSB 0x06
39#define ADT7411_REG_INT_TEMP_MSB 0x07
40#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
41
42#define ADT7411_REG_CFG1 0x18
43#define ADT7411_CFG1_START_MONITOR BIT(0)
44#define ADT7411_CFG1_RESERVED_BIT1 BIT(1)
45#define ADT7411_CFG1_EXT_TDM BIT(2)
46#define ADT7411_CFG1_RESERVED_BIT3 BIT(3)
47
48#define ADT7411_REG_CFG2 0x19
49#define ADT7411_CFG2_DISABLE_AVG BIT(5)
50
51#define ADT7411_REG_CFG3 0x1a
52#define ADT7411_CFG3_ADC_CLK_225 BIT(0)
53#define ADT7411_CFG3_RESERVED_BIT1 BIT(1)
54#define ADT7411_CFG3_RESERVED_BIT2 BIT(2)
55#define ADT7411_CFG3_RESERVED_BIT3 BIT(3)
56#define ADT7411_CFG3_REF_VDD BIT(4)
57
58#define ADT7411_REG_VDD_HIGH 0x23
59#define ADT7411_REG_VDD_LOW 0x24
60#define ADT7411_REG_TEMP_HIGH(nr) (0x25 + 2 * (nr))
61#define ADT7411_REG_TEMP_LOW(nr) (0x26 + 2 * (nr))
62#define ADT7411_REG_IN_HIGH(nr) ((nr) > 1 \
63 ? 0x2b + 2 * ((nr)-2) \
64 : 0x27)
65#define ADT7411_REG_IN_LOW(nr) ((nr) > 1 \
66 ? 0x2c + 2 * ((nr)-2) \
67 : 0x28)
68
69#define ADT7411_REG_DEVICE_ID 0x4d
70#define ADT7411_REG_MANUFACTURER_ID 0x4e
71
72#define ADT7411_DEVICE_ID 0x2
73#define ADT7411_MANUFACTURER_ID 0x41
74
75static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
76
77static const u8 adt7411_in_alarm_reg[] = {
78 ADT7411_REG_STAT_2,
79 ADT7411_REG_STAT_1,
80 ADT7411_REG_STAT_1,
81 ADT7411_REG_STAT_1,
82 ADT7411_REG_STAT_1,
83 ADT7411_REG_STAT_2,
84 ADT7411_REG_STAT_2,
85 ADT7411_REG_STAT_2,
86 ADT7411_REG_STAT_2,
87};
88
89static const u8 adt7411_in_alarm_bits[] = {
90 ADT7411_STAT_2_VDD,
91 ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1,
92 ADT7411_STAT_1_AIN2,
93 ADT7411_STAT_1_AIN3,
94 ADT7411_STAT_1_AIN4,
95 ADT7411_STAT_2_AIN5,
96 ADT7411_STAT_2_AIN6,
97 ADT7411_STAT_2_AIN7,
98 ADT7411_STAT_2_AIN8,
99};
100
101struct adt7411_data {
102 struct mutex device_lock; /* for "atomic" device accesses */
103 struct mutex update_lock;
104 unsigned long next_update;
105 long vref_cached;
106 struct i2c_client *client;
107 bool use_ext_temp;
108};
109
110/*
111 * When reading a register containing (up to 4) lsb, all associated
112 * msb-registers get locked by the hardware. After _one_ of those msb is read,
113 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
114 * is protected here with a mutex, too.
115 */
116static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
117 u8 msb_reg, u8 lsb_shift)
118{
119 struct adt7411_data *data = i2c_get_clientdata(client);
120 int val, tmp;
121
122 mutex_lock(&data->device_lock);
123
124 val = i2c_smbus_read_byte_data(client, lsb_reg);
125 if (val < 0)
126 goto exit_unlock;
127
128 tmp = (val >> lsb_shift) & 3;
129 val = i2c_smbus_read_byte_data(client, msb_reg);
130
131 if (val >= 0)
132 val = (val << 2) | tmp;
133
134 exit_unlock:
135 mutex_unlock(&data->device_lock);
136
137 return val;
138}
139
140static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
141 bool flag)
142{
143 struct adt7411_data *data = i2c_get_clientdata(client);
144 int ret, val;
145
146 mutex_lock(&data->device_lock);
147
148 ret = i2c_smbus_read_byte_data(client, reg);
149 if (ret < 0)
150 goto exit_unlock;
151
152 if (flag)
153 val = ret | bit;
154 else
155 val = ret & ~bit;
156
157 ret = i2c_smbus_write_byte_data(client, reg, val);
158
159 exit_unlock:
160 mutex_unlock(&data->device_lock);
161 return ret;
162}
163
164static ssize_t adt7411_show_bit(struct device *dev,
165 struct device_attribute *attr, char *buf)
166{
167 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
168 struct adt7411_data *data = dev_get_drvdata(dev);
169 struct i2c_client *client = data->client;
170 int ret = i2c_smbus_read_byte_data(client, attr2->index);
171
172 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
173}
174
175static ssize_t adt7411_set_bit(struct device *dev,
176 struct device_attribute *attr, const char *buf,
177 size_t count)
178{
179 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
180 struct adt7411_data *data = dev_get_drvdata(dev);
181 struct i2c_client *client = data->client;
182 int ret;
183 unsigned long flag;
184
185 ret = kstrtoul(buf, 0, &flag);
186 if (ret || flag > 1)
187 return -EINVAL;
188
189 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
190
191 /* force update */
192 mutex_lock(&data->update_lock);
193 data->next_update = jiffies;
194 mutex_unlock(&data->update_lock);
195
196 return ret < 0 ? ret : count;
197}
198
199#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
200 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
201 adt7411_set_bit, __bit, __reg)
202
203static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
204static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
205static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
206
207static struct attribute *adt7411_attrs[] = {
208 &sensor_dev_attr_no_average.dev_attr.attr,
209 &sensor_dev_attr_fast_sampling.dev_attr.attr,
210 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
211 NULL
212};
213ATTRIBUTE_GROUPS(adt7411);
214
215static int adt7411_read_in_alarm(struct device *dev, int channel, long *val)
216{
217 struct adt7411_data *data = dev_get_drvdata(dev);
218 struct i2c_client *client = data->client;
219 int ret;
220
221 ret = i2c_smbus_read_byte_data(client, adt7411_in_alarm_reg[channel]);
222 if (ret < 0)
223 return ret;
224 *val = !!(ret & adt7411_in_alarm_bits[channel]);
225 return 0;
226}
227
228static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val)
229{
230 struct adt7411_data *data = dev_get_drvdata(dev);
231 struct i2c_client *client = data->client;
232 int ret;
233
234 switch (attr) {
235 case hwmon_in_input:
236 ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
237 ADT7411_REG_VDD_MSB, 2);
238 if (ret < 0)
239 return ret;
240 *val = ret * 7000 / 1024;
241 return 0;
242 case hwmon_in_min:
243 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_LOW);
244 if (ret < 0)
245 return ret;
246 *val = ret * 7000 / 256;
247 return 0;
248 case hwmon_in_max:
249 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_HIGH);
250 if (ret < 0)
251 return ret;
252 *val = ret * 7000 / 256;
253 return 0;
254 case hwmon_in_alarm:
255 return adt7411_read_in_alarm(dev, 0, val);
256 default:
257 return -EOPNOTSUPP;
258 }
259}
260
261static int adt7411_update_vref(struct device *dev)
262{
263 struct adt7411_data *data = dev_get_drvdata(dev);
264 struct i2c_client *client = data->client;
265 int val;
266
267 if (time_after_eq(jiffies, data->next_update)) {
268 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
269 if (val < 0)
270 return val;
271
272 if (val & ADT7411_CFG3_REF_VDD) {
273 val = adt7411_read_in_vdd(dev, hwmon_in_input,
274 &data->vref_cached);
275 if (val < 0)
276 return val;
277 } else {
278 data->vref_cached = 2250;
279 }
280
281 data->next_update = jiffies + HZ;
282 }
283
284 return 0;
285}
286
287static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
288 long *val)
289{
290 struct adt7411_data *data = dev_get_drvdata(dev);
291 struct i2c_client *client = data->client;
292
293 int ret;
294 int reg, lsb_reg, lsb_shift;
295 int nr = channel - 1;
296
297 mutex_lock(&data->update_lock);
298 ret = adt7411_update_vref(dev);
299 if (ret < 0)
300 goto exit_unlock;
301
302 switch (attr) {
303 case hwmon_in_input:
304 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
305 lsb_shift = 2 * (nr & 0x03);
306 ret = adt7411_read_10_bit(client, lsb_reg,
307 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
308 lsb_shift);
309 if (ret < 0)
310 goto exit_unlock;
311 *val = ret * data->vref_cached / 1024;
312 ret = 0;
313 break;
314 case hwmon_in_min:
315 case hwmon_in_max:
316 reg = (attr == hwmon_in_min)
317 ? ADT7411_REG_IN_LOW(channel)
318 : ADT7411_REG_IN_HIGH(channel);
319 ret = i2c_smbus_read_byte_data(client, reg);
320 if (ret < 0)
321 goto exit_unlock;
322 *val = ret * data->vref_cached / 256;
323 ret = 0;
324 break;
325 case hwmon_in_alarm:
326 ret = adt7411_read_in_alarm(dev, channel, val);
327 break;
328 default:
329 ret = -EOPNOTSUPP;
330 break;
331 }
332 exit_unlock:
333 mutex_unlock(&data->update_lock);
334 return ret;
335}
336
337static int adt7411_read_in(struct device *dev, u32 attr, int channel,
338 long *val)
339{
340 if (channel == 0)
341 return adt7411_read_in_vdd(dev, attr, val);
342 else
343 return adt7411_read_in_chan(dev, attr, channel, val);
344}
345
346
347static int adt7411_read_temp_alarm(struct device *dev, u32 attr, int channel,
348 long *val)
349{
350 struct adt7411_data *data = dev_get_drvdata(dev);
351 struct i2c_client *client = data->client;
352 int ret, bit;
353
354 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_STAT_1);
355 if (ret < 0)
356 return ret;
357
358 switch (attr) {
359 case hwmon_temp_min_alarm:
360 bit = channel ? ADT7411_STAT_1_EXT_TEMP_LOW
361 : ADT7411_STAT_1_INT_TEMP_LOW;
362 break;
363 case hwmon_temp_max_alarm:
364 bit = channel ? ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1
365 : ADT7411_STAT_1_INT_TEMP_HIGH;
366 break;
367 case hwmon_temp_fault:
368 bit = ADT7411_STAT_1_EXT_TEMP_FAULT;
369 break;
370 default:
371 return -EOPNOTSUPP;
372 }
373
374 *val = !!(ret & bit);
375 return 0;
376}
377
378static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
379 long *val)
380{
381 struct adt7411_data *data = dev_get_drvdata(dev);
382 struct i2c_client *client = data->client;
383 int ret, reg, regl, regh;
384
385 switch (attr) {
386 case hwmon_temp_input:
387 regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
388 ADT7411_REG_INT_TEMP_VDD_LSB;
389 regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
390 ADT7411_REG_INT_TEMP_MSB;
391 ret = adt7411_read_10_bit(client, regl, regh, 0);
392 if (ret < 0)
393 return ret;
394 ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
395 *val = ret * 250;
396 return 0;
397 case hwmon_temp_min:
398 case hwmon_temp_max:
399 reg = (attr == hwmon_temp_min)
400 ? ADT7411_REG_TEMP_LOW(channel)
401 : ADT7411_REG_TEMP_HIGH(channel);
402 ret = i2c_smbus_read_byte_data(client, reg);
403 if (ret < 0)
404 return ret;
405 ret = ret & 0x80 ? ret - 0x100 : ret; /* 8 bit signed */
406 *val = ret * 1000;
407 return 0;
408 case hwmon_temp_min_alarm:
409 case hwmon_temp_max_alarm:
410 case hwmon_temp_fault:
411 return adt7411_read_temp_alarm(dev, attr, channel, val);
412 default:
413 return -EOPNOTSUPP;
414 }
415}
416
417static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
418 u32 attr, int channel, long *val)
419{
420 switch (type) {
421 case hwmon_in:
422 return adt7411_read_in(dev, attr, channel, val);
423 case hwmon_temp:
424 return adt7411_read_temp(dev, attr, channel, val);
425 default:
426 return -EOPNOTSUPP;
427 }
428}
429
430static int adt7411_write_in_vdd(struct device *dev, u32 attr, long val)
431{
432 struct adt7411_data *data = dev_get_drvdata(dev);
433 struct i2c_client *client = data->client;
434 int reg;
435
436 val = clamp_val(val, 0, 255 * 7000 / 256);
437 val = DIV_ROUND_CLOSEST(val * 256, 7000);
438
439 switch (attr) {
440 case hwmon_in_min:
441 reg = ADT7411_REG_VDD_LOW;
442 break;
443 case hwmon_in_max:
444 reg = ADT7411_REG_VDD_HIGH;
445 break;
446 default:
447 return -EOPNOTSUPP;
448 }
449
450 return i2c_smbus_write_byte_data(client, reg, val);
451}
452
453static int adt7411_write_in_chan(struct device *dev, u32 attr, int channel,
454 long val)
455{
456 struct adt7411_data *data = dev_get_drvdata(dev);
457 struct i2c_client *client = data->client;
458 int ret, reg;
459
460 mutex_lock(&data->update_lock);
461 ret = adt7411_update_vref(dev);
462 if (ret < 0)
463 goto exit_unlock;
464 val = clamp_val(val, 0, 255 * data->vref_cached / 256);
465 val = DIV_ROUND_CLOSEST(val * 256, data->vref_cached);
466
467 switch (attr) {
468 case hwmon_in_min:
469 reg = ADT7411_REG_IN_LOW(channel);
470 break;
471 case hwmon_in_max:
472 reg = ADT7411_REG_IN_HIGH(channel);
473 break;
474 default:
475 ret = -EOPNOTSUPP;
476 goto exit_unlock;
477 }
478
479 ret = i2c_smbus_write_byte_data(client, reg, val);
480 exit_unlock:
481 mutex_unlock(&data->update_lock);
482 return ret;
483}
484
485static int adt7411_write_in(struct device *dev, u32 attr, int channel,
486 long val)
487{
488 if (channel == 0)
489 return adt7411_write_in_vdd(dev, attr, val);
490 else
491 return adt7411_write_in_chan(dev, attr, channel, val);
492}
493
494static int adt7411_write_temp(struct device *dev, u32 attr, int channel,
495 long val)
496{
497 struct adt7411_data *data = dev_get_drvdata(dev);
498 struct i2c_client *client = data->client;
499 int reg;
500
501 val = clamp_val(val, -128000, 127000);
502 val = DIV_ROUND_CLOSEST(val, 1000);
503
504 switch (attr) {
505 case hwmon_temp_min:
506 reg = ADT7411_REG_TEMP_LOW(channel);
507 break;
508 case hwmon_temp_max:
509 reg = ADT7411_REG_TEMP_HIGH(channel);
510 break;
511 default:
512 return -EOPNOTSUPP;
513 }
514
515 return i2c_smbus_write_byte_data(client, reg, val);
516}
517
518static int adt7411_write(struct device *dev, enum hwmon_sensor_types type,
519 u32 attr, int channel, long val)
520{
521 switch (type) {
522 case hwmon_in:
523 return adt7411_write_in(dev, attr, channel, val);
524 case hwmon_temp:
525 return adt7411_write_temp(dev, attr, channel, val);
526 default:
527 return -EOPNOTSUPP;
528 }
529}
530
531static umode_t adt7411_is_visible(const void *_data,
532 enum hwmon_sensor_types type,
533 u32 attr, int channel)
534{
535 const struct adt7411_data *data = _data;
536 bool visible;
537
538 switch (type) {
539 case hwmon_in:
540 visible = channel == 0 || channel >= 3 || !data->use_ext_temp;
541 switch (attr) {
542 case hwmon_in_input:
543 case hwmon_in_alarm:
544 return visible ? S_IRUGO : 0;
545 case hwmon_in_min:
546 case hwmon_in_max:
547 return visible ? S_IRUGO | S_IWUSR : 0;
548 }
549 break;
550 case hwmon_temp:
551 visible = channel == 0 || data->use_ext_temp;
552 switch (attr) {
553 case hwmon_temp_input:
554 case hwmon_temp_min_alarm:
555 case hwmon_temp_max_alarm:
556 case hwmon_temp_fault:
557 return visible ? S_IRUGO : 0;
558 case hwmon_temp_min:
559 case hwmon_temp_max:
560 return visible ? S_IRUGO | S_IWUSR : 0;
561 }
562 break;
563 default:
564 break;
565 }
566 return 0;
567}
568
569static int adt7411_detect(struct i2c_client *client,
570 struct i2c_board_info *info)
571{
572 int val;
573
574 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
575 return -ENODEV;
576
577 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
578 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
579 dev_dbg(&client->dev,
580 "Wrong manufacturer ID. Got %d, expected %d\n",
581 val, ADT7411_MANUFACTURER_ID);
582 return -ENODEV;
583 }
584
585 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
586 if (val < 0 || val != ADT7411_DEVICE_ID) {
587 dev_dbg(&client->dev,
588 "Wrong device ID. Got %d, expected %d\n",
589 val, ADT7411_DEVICE_ID);
590 return -ENODEV;
591 }
592
593 strscpy(info->type, "adt7411", I2C_NAME_SIZE);
594
595 return 0;
596}
597
598static int adt7411_init_device(struct adt7411_data *data)
599{
600 int ret;
601 u8 val;
602
603 ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
604 if (ret < 0)
605 return ret;
606
607 /*
608 * We must only write zero to bit 1 and bit 2 and only one to bit 3
609 * according to the datasheet.
610 */
611 val = ret;
612 val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
613 val |= ADT7411_CFG3_RESERVED_BIT3;
614
615 ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
616 if (ret < 0)
617 return ret;
618
619 ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
620 if (ret < 0)
621 return ret;
622
623 data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;
624
625 /*
626 * We must only write zero to bit 1 and only one to bit 3 according to
627 * the datasheet.
628 */
629 val = ret;
630 val &= ~ADT7411_CFG1_RESERVED_BIT1;
631 val |= ADT7411_CFG1_RESERVED_BIT3;
632
633 /* enable monitoring */
634 val |= ADT7411_CFG1_START_MONITOR;
635
636 return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
637}
638
639static const struct hwmon_channel_info * const adt7411_info[] = {
640 HWMON_CHANNEL_INFO(in,
641 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
642 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
643 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
644 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
645 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
646 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
647 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
648 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
649 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
650 HWMON_CHANNEL_INFO(temp,
651 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
652 HWMON_T_MAX | HWMON_T_MAX_ALARM,
653 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
654 HWMON_T_MAX | HWMON_T_MAX_ALARM | HWMON_T_FAULT),
655 NULL
656};
657
658static const struct hwmon_ops adt7411_hwmon_ops = {
659 .is_visible = adt7411_is_visible,
660 .read = adt7411_read,
661 .write = adt7411_write,
662};
663
664static const struct hwmon_chip_info adt7411_chip_info = {
665 .ops = &adt7411_hwmon_ops,
666 .info = adt7411_info,
667};
668
669static int adt7411_probe(struct i2c_client *client)
670{
671 struct device *dev = &client->dev;
672 struct adt7411_data *data;
673 struct device *hwmon_dev;
674 int ret;
675
676 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
677 if (!data)
678 return -ENOMEM;
679
680 i2c_set_clientdata(client, data);
681 data->client = client;
682 mutex_init(&data->device_lock);
683 mutex_init(&data->update_lock);
684
685 ret = adt7411_init_device(data);
686 if (ret < 0)
687 return ret;
688
689 /* force update on first occasion */
690 data->next_update = jiffies;
691
692 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
693 data,
694 &adt7411_chip_info,
695 adt7411_groups);
696 return PTR_ERR_OR_ZERO(hwmon_dev);
697}
698
699static const struct i2c_device_id adt7411_id[] = {
700 { "adt7411", 0 },
701 { }
702};
703MODULE_DEVICE_TABLE(i2c, adt7411_id);
704
705static struct i2c_driver adt7411_driver = {
706 .driver = {
707 .name = "adt7411",
708 },
709 .probe = adt7411_probe,
710 .id_table = adt7411_id,
711 .detect = adt7411_detect,
712 .address_list = normal_i2c,
713 .class = I2C_CLASS_HWMON,
714};
715
716module_i2c_driver(adt7411_driver);
717
718MODULE_AUTHOR("Sascha Hauer, Wolfram Sang <kernel@pengutronix.de>");
719MODULE_DESCRIPTION("ADT7411 driver");
720MODULE_LICENSE("GPL v2");
1/*
2 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
3 *
4 * Copyright (C) 2008, 2010 Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * TODO: SPI, support for external temperature sensor
11 * use power-down mode for suspend?, interrupt handling?
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/err.h>
18#include <linux/mutex.h>
19#include <linux/jiffies.h>
20#include <linux/i2c.h>
21#include <linux/hwmon.h>
22#include <linux/hwmon-sysfs.h>
23#include <linux/slab.h>
24
25#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
26#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
27#define ADT7411_REG_VDD_MSB 0x06
28#define ADT7411_REG_INT_TEMP_MSB 0x07
29#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
30
31#define ADT7411_REG_CFG1 0x18
32#define ADT7411_CFG1_START_MONITOR (1 << 0)
33
34#define ADT7411_REG_CFG2 0x19
35#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
36
37#define ADT7411_REG_CFG3 0x1a
38#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
39#define ADT7411_CFG3_REF_VDD (1 << 4)
40
41#define ADT7411_REG_DEVICE_ID 0x4d
42#define ADT7411_REG_MANUFACTURER_ID 0x4e
43
44#define ADT7411_DEVICE_ID 0x2
45#define ADT7411_MANUFACTURER_ID 0x41
46
47static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
48
49struct adt7411_data {
50 struct mutex device_lock; /* for "atomic" device accesses */
51 struct mutex update_lock;
52 unsigned long next_update;
53 int vref_cached;
54 struct i2c_client *client;
55};
56
57/*
58 * When reading a register containing (up to 4) lsb, all associated
59 * msb-registers get locked by the hardware. After _one_ of those msb is read,
60 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
61 * is protected here with a mutex, too.
62 */
63static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
64 u8 msb_reg, u8 lsb_shift)
65{
66 struct adt7411_data *data = i2c_get_clientdata(client);
67 int val, tmp;
68
69 mutex_lock(&data->device_lock);
70
71 val = i2c_smbus_read_byte_data(client, lsb_reg);
72 if (val < 0)
73 goto exit_unlock;
74
75 tmp = (val >> lsb_shift) & 3;
76 val = i2c_smbus_read_byte_data(client, msb_reg);
77
78 if (val >= 0)
79 val = (val << 2) | tmp;
80
81 exit_unlock:
82 mutex_unlock(&data->device_lock);
83
84 return val;
85}
86
87static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
88 bool flag)
89{
90 struct adt7411_data *data = i2c_get_clientdata(client);
91 int ret, val;
92
93 mutex_lock(&data->device_lock);
94
95 ret = i2c_smbus_read_byte_data(client, reg);
96 if (ret < 0)
97 goto exit_unlock;
98
99 if (flag)
100 val = ret | bit;
101 else
102 val = ret & ~bit;
103
104 ret = i2c_smbus_write_byte_data(client, reg, val);
105
106 exit_unlock:
107 mutex_unlock(&data->device_lock);
108 return ret;
109}
110
111static ssize_t adt7411_show_vdd(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 struct adt7411_data *data = dev_get_drvdata(dev);
115 struct i2c_client *client = data->client;
116 int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
117 ADT7411_REG_VDD_MSB, 2);
118
119 return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
120}
121
122static ssize_t adt7411_show_temp(struct device *dev,
123 struct device_attribute *attr, char *buf)
124{
125 struct adt7411_data *data = dev_get_drvdata(dev);
126 struct i2c_client *client = data->client;
127 int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
128 ADT7411_REG_INT_TEMP_MSB, 0);
129
130 if (val < 0)
131 return val;
132
133 val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
134
135 return sprintf(buf, "%d\n", val * 250);
136}
137
138static ssize_t adt7411_show_input(struct device *dev,
139 struct device_attribute *attr, char *buf)
140{
141 int nr = to_sensor_dev_attr(attr)->index;
142 struct adt7411_data *data = dev_get_drvdata(dev);
143 struct i2c_client *client = data->client;
144 int val;
145 u8 lsb_reg, lsb_shift;
146
147 mutex_lock(&data->update_lock);
148 if (time_after_eq(jiffies, data->next_update)) {
149 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
150 if (val < 0)
151 goto exit_unlock;
152
153 if (val & ADT7411_CFG3_REF_VDD) {
154 val = adt7411_read_10_bit(client,
155 ADT7411_REG_INT_TEMP_VDD_LSB,
156 ADT7411_REG_VDD_MSB, 2);
157 if (val < 0)
158 goto exit_unlock;
159
160 data->vref_cached = val * 7000 / 1024;
161 } else {
162 data->vref_cached = 2250;
163 }
164
165 data->next_update = jiffies + HZ;
166 }
167
168 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
169 lsb_shift = 2 * (nr & 0x03);
170 val = adt7411_read_10_bit(client, lsb_reg,
171 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
172 if (val < 0)
173 goto exit_unlock;
174
175 val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
176 exit_unlock:
177 mutex_unlock(&data->update_lock);
178 return val;
179}
180
181static ssize_t adt7411_show_bit(struct device *dev,
182 struct device_attribute *attr, char *buf)
183{
184 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
185 struct adt7411_data *data = dev_get_drvdata(dev);
186 struct i2c_client *client = data->client;
187 int ret = i2c_smbus_read_byte_data(client, attr2->index);
188
189 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
190}
191
192static ssize_t adt7411_set_bit(struct device *dev,
193 struct device_attribute *attr, const char *buf,
194 size_t count)
195{
196 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
197 struct adt7411_data *data = dev_get_drvdata(dev);
198 struct i2c_client *client = data->client;
199 int ret;
200 unsigned long flag;
201
202 ret = kstrtoul(buf, 0, &flag);
203 if (ret || flag > 1)
204 return -EINVAL;
205
206 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
207
208 /* force update */
209 mutex_lock(&data->update_lock);
210 data->next_update = jiffies;
211 mutex_unlock(&data->update_lock);
212
213 return ret < 0 ? ret : count;
214}
215
216#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
217 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
218 adt7411_set_bit, __bit, __reg)
219
220static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);
221static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
222static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
223static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
224static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
225static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
226static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
227static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
228static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
229static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
230static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
231static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
232static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
233
234static struct attribute *adt7411_attrs[] = {
235 &dev_attr_temp1_input.attr,
236 &dev_attr_in0_input.attr,
237 &sensor_dev_attr_in1_input.dev_attr.attr,
238 &sensor_dev_attr_in2_input.dev_attr.attr,
239 &sensor_dev_attr_in3_input.dev_attr.attr,
240 &sensor_dev_attr_in4_input.dev_attr.attr,
241 &sensor_dev_attr_in5_input.dev_attr.attr,
242 &sensor_dev_attr_in6_input.dev_attr.attr,
243 &sensor_dev_attr_in7_input.dev_attr.attr,
244 &sensor_dev_attr_in8_input.dev_attr.attr,
245 &sensor_dev_attr_no_average.dev_attr.attr,
246 &sensor_dev_attr_fast_sampling.dev_attr.attr,
247 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
248 NULL
249};
250
251ATTRIBUTE_GROUPS(adt7411);
252
253static int adt7411_detect(struct i2c_client *client,
254 struct i2c_board_info *info)
255{
256 int val;
257
258 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
259 return -ENODEV;
260
261 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
262 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
263 dev_dbg(&client->dev,
264 "Wrong manufacturer ID. Got %d, expected %d\n",
265 val, ADT7411_MANUFACTURER_ID);
266 return -ENODEV;
267 }
268
269 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
270 if (val < 0 || val != ADT7411_DEVICE_ID) {
271 dev_dbg(&client->dev,
272 "Wrong device ID. Got %d, expected %d\n",
273 val, ADT7411_DEVICE_ID);
274 return -ENODEV;
275 }
276
277 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
278
279 return 0;
280}
281
282static int adt7411_probe(struct i2c_client *client,
283 const struct i2c_device_id *id)
284{
285 struct device *dev = &client->dev;
286 struct adt7411_data *data;
287 struct device *hwmon_dev;
288 int ret;
289
290 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
291 if (!data)
292 return -ENOMEM;
293
294 i2c_set_clientdata(client, data);
295 data->client = client;
296 mutex_init(&data->device_lock);
297 mutex_init(&data->update_lock);
298
299 ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
300 ADT7411_CFG1_START_MONITOR, 1);
301 if (ret < 0)
302 return ret;
303
304 /* force update on first occasion */
305 data->next_update = jiffies;
306
307 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
308 data,
309 adt7411_groups);
310 return PTR_ERR_OR_ZERO(hwmon_dev);
311}
312
313static const struct i2c_device_id adt7411_id[] = {
314 { "adt7411", 0 },
315 { }
316};
317MODULE_DEVICE_TABLE(i2c, adt7411_id);
318
319static struct i2c_driver adt7411_driver = {
320 .driver = {
321 .name = "adt7411",
322 },
323 .probe = adt7411_probe,
324 .id_table = adt7411_id,
325 .detect = adt7411_detect,
326 .address_list = normal_i2c,
327 .class = I2C_CLASS_HWMON,
328};
329
330module_i2c_driver(adt7411_driver);
331
332MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
333 "Wolfram Sang <w.sang@pengutronix.de>");
334MODULE_DESCRIPTION("ADT7411 driver");
335MODULE_LICENSE("GPL v2");