1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/jiffies.h>
24#include <linux/i2c.h>
25#include <linux/hwmon.h>
26#include <linux/hwmon-sysfs.h>
27#include <linux/err.h>
28#include <linux/regulator/consumer.h>
29#include <linux/mutex.h>
30#include <linux/bitops.h>
31#include <linux/of.h>
32
33
34
35
36
37
38static const unsigned short normal_i2c[] = {
39 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
40
41
42#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
43#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
44#define ADC128_REG_IN(nr) (0x20 + (nr))
45
46#define ADC128_REG_TEMP 0x27
47#define ADC128_REG_TEMP_MAX 0x38
48#define ADC128_REG_TEMP_HYST 0x39
49
50#define ADC128_REG_CONFIG 0x00
51#define ADC128_REG_ALARM 0x01
52#define ADC128_REG_MASK 0x03
53#define ADC128_REG_CONV_RATE 0x07
54#define ADC128_REG_ONESHOT 0x09
55#define ADC128_REG_SHUTDOWN 0x0a
56#define ADC128_REG_CONFIG_ADV 0x0b
57#define ADC128_REG_BUSY_STATUS 0x0c
58
59#define ADC128_REG_MAN_ID 0x3e
60#define ADC128_REG_DEV_ID 0x3f
61
62
63#define ADC128_ATTR_NUM_VOLT (8 * 4)
64
65
66static const u8 num_inputs[] = { 7, 8, 4, 6 };
67
68struct adc128_data {
69 struct i2c_client *client;
70 struct regulator *regulator;
71 int vref;
72 struct mutex update_lock;
73 u8 mode;
74 bool valid;
75 unsigned long last_updated;
76
77 u16 in[3][8];
78
79
80
81
82 s16 temp[3];
83
84
85 u8 alarms;
86};
87
88static struct adc128_data *adc128_update_device(struct device *dev)
89{
90 struct adc128_data *data = dev_get_drvdata(dev);
91 struct i2c_client *client = data->client;
92 struct adc128_data *ret = data;
93 int i, rv;
94
95 mutex_lock(&data->update_lock);
96
97 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
98 for (i = 0; i < num_inputs[data->mode]; i++) {
99 rv = i2c_smbus_read_word_swapped(client,
100 ADC128_REG_IN(i));
101 if (rv < 0)
102 goto abort;
103 data->in[0][i] = rv >> 4;
104
105 rv = i2c_smbus_read_byte_data(client,
106 ADC128_REG_IN_MIN(i));
107 if (rv < 0)
108 goto abort;
109 data->in[1][i] = rv << 4;
110
111 rv = i2c_smbus_read_byte_data(client,
112 ADC128_REG_IN_MAX(i));
113 if (rv < 0)
114 goto abort;
115 data->in[2][i] = rv << 4;
116 }
117
118 if (data->mode != 1) {
119 rv = i2c_smbus_read_word_swapped(client,
120 ADC128_REG_TEMP);
121 if (rv < 0)
122 goto abort;
123 data->temp[0] = rv >> 7;
124
125 rv = i2c_smbus_read_byte_data(client,
126 ADC128_REG_TEMP_MAX);
127 if (rv < 0)
128 goto abort;
129 data->temp[1] = rv << 1;
130
131 rv = i2c_smbus_read_byte_data(client,
132 ADC128_REG_TEMP_HYST);
133 if (rv < 0)
134 goto abort;
135 data->temp[2] = rv << 1;
136 }
137
138 rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
139 if (rv < 0)
140 goto abort;
141 data->alarms |= rv;
142
143 data->last_updated = jiffies;
144 data->valid = true;
145 }
146 goto done;
147
148abort:
149 ret = ERR_PTR(rv);
150 data->valid = false;
151done:
152 mutex_unlock(&data->update_lock);
153 return ret;
154}
155
156static ssize_t adc128_show_in(struct device *dev, struct device_attribute *attr,
157 char *buf)
158{
159 struct adc128_data *data = adc128_update_device(dev);
160 int index = to_sensor_dev_attr_2(attr)->index;
161 int nr = to_sensor_dev_attr_2(attr)->nr;
162 int val;
163
164 if (IS_ERR(data))
165 return PTR_ERR(data);
166
167 val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
168 return sprintf(buf, "%d\n", val);
169}
170
171static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr,
172 const char *buf, size_t count)
173{
174 struct adc128_data *data = dev_get_drvdata(dev);
175 int index = to_sensor_dev_attr_2(attr)->index;
176 int nr = to_sensor_dev_attr_2(attr)->nr;
177 u8 reg, regval;
178 long val;
179 int err;
180
181 err = kstrtol(buf, 10, &val);
182 if (err < 0)
183 return err;
184
185 mutex_lock(&data->update_lock);
186
187 regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
188 data->in[index][nr] = regval << 4;
189 reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
190 i2c_smbus_write_byte_data(data->client, reg, regval);
191 mutex_unlock(&data->update_lock);
192
193 return count;
194}
195
196static ssize_t adc128_show_temp(struct device *dev,
197 struct device_attribute *attr, char *buf)
198{
199 struct adc128_data *data = adc128_update_device(dev);
200 int index = to_sensor_dev_attr(attr)->index;
201 int temp;
202
203 if (IS_ERR(data))
204 return PTR_ERR(data);
205
206 temp = sign_extend32(data->temp[index], 8);
207 return sprintf(buf, "%d\n", temp * 500);
208}
209
210static ssize_t adc128_set_temp(struct device *dev,
211 struct device_attribute *attr,
212 const char *buf, size_t count)
213{
214 struct adc128_data *data = dev_get_drvdata(dev);
215 int index = to_sensor_dev_attr(attr)->index;
216 long val;
217 int err;
218 s8 regval;
219
220 err = kstrtol(buf, 10, &val);
221 if (err < 0)
222 return err;
223
224 mutex_lock(&data->update_lock);
225 regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
226 data->temp[index] = regval << 1;
227 i2c_smbus_write_byte_data(data->client,
228 index == 1 ? ADC128_REG_TEMP_MAX
229 : ADC128_REG_TEMP_HYST,
230 regval);
231 mutex_unlock(&data->update_lock);
232
233 return count;
234}
235
236static ssize_t adc128_show_alarm(struct device *dev,
237 struct device_attribute *attr, char *buf)
238{
239 struct adc128_data *data = adc128_update_device(dev);
240 int mask = 1 << to_sensor_dev_attr(attr)->index;
241 u8 alarms;
242
243 if (IS_ERR(data))
244 return PTR_ERR(data);
245
246
247
248
249
250 alarms = data->alarms;
251 data->alarms &= ~mask;
252
253 return sprintf(buf, "%u\n", !!(alarms & mask));
254}
255
256static umode_t adc128_is_visible(struct kobject *kobj,
257 struct attribute *attr, int index)
258{
259 struct device *dev = container_of(kobj, struct device, kobj);
260 struct adc128_data *data = dev_get_drvdata(dev);
261
262 if (index < ADC128_ATTR_NUM_VOLT) {
263
264 if (index >= num_inputs[data->mode] * 4)
265 return 0;
266 } else {
267
268 if (data->mode == 1)
269 return 0;
270 }
271
272 return attr->mode;
273}
274
275static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
276 adc128_show_in, NULL, 0, 0);
277static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
278 adc128_show_in, adc128_set_in, 0, 1);
279static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
280 adc128_show_in, adc128_set_in, 0, 2);
281
282static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
283 adc128_show_in, NULL, 1, 0);
284static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
285 adc128_show_in, adc128_set_in, 1, 1);
286static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
287 adc128_show_in, adc128_set_in, 1, 2);
288
289static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
290 adc128_show_in, NULL, 2, 0);
291static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
292 adc128_show_in, adc128_set_in, 2, 1);
293static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
294 adc128_show_in, adc128_set_in, 2, 2);
295
296static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
297 adc128_show_in, NULL, 3, 0);
298static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
299 adc128_show_in, adc128_set_in, 3, 1);
300static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
301 adc128_show_in, adc128_set_in, 3, 2);
302
303static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
304 adc128_show_in, NULL, 4, 0);
305static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
306 adc128_show_in, adc128_set_in, 4, 1);
307static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
308 adc128_show_in, adc128_set_in, 4, 2);
309
310static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
311 adc128_show_in, NULL, 5, 0);
312static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
313 adc128_show_in, adc128_set_in, 5, 1);
314static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
315 adc128_show_in, adc128_set_in, 5, 2);
316
317static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
318 adc128_show_in, NULL, 6, 0);
319static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
320 adc128_show_in, adc128_set_in, 6, 1);
321static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
322 adc128_show_in, adc128_set_in, 6, 2);
323
324static SENSOR_DEVICE_ATTR_2(in7_input, S_IRUGO,
325 adc128_show_in, NULL, 7, 0);
326static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO,
327 adc128_show_in, adc128_set_in, 7, 1);
328static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO,
329 adc128_show_in, adc128_set_in, 7, 2);
330
331static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
332static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
333 adc128_show_temp, adc128_set_temp, 1);
334static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
335 adc128_show_temp, adc128_set_temp, 2);
336
337static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
338static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
339static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
340static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
341static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
342static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
343static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
344static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
345static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
346
347static struct attribute *adc128_attrs[] = {
348 &sensor_dev_attr_in0_alarm.dev_attr.attr,
349 &sensor_dev_attr_in0_input.dev_attr.attr,
350 &sensor_dev_attr_in0_max.dev_attr.attr,
351 &sensor_dev_attr_in0_min.dev_attr.attr,
352 &sensor_dev_attr_in1_alarm.dev_attr.attr,
353 &sensor_dev_attr_in1_input.dev_attr.attr,
354 &sensor_dev_attr_in1_max.dev_attr.attr,
355 &sensor_dev_attr_in1_min.dev_attr.attr,
356 &sensor_dev_attr_in2_alarm.dev_attr.attr,
357 &sensor_dev_attr_in2_input.dev_attr.attr,
358 &sensor_dev_attr_in2_max.dev_attr.attr,
359 &sensor_dev_attr_in2_min.dev_attr.attr,
360 &sensor_dev_attr_in3_alarm.dev_attr.attr,
361 &sensor_dev_attr_in3_input.dev_attr.attr,
362 &sensor_dev_attr_in3_max.dev_attr.attr,
363 &sensor_dev_attr_in3_min.dev_attr.attr,
364 &sensor_dev_attr_in4_alarm.dev_attr.attr,
365 &sensor_dev_attr_in4_input.dev_attr.attr,
366 &sensor_dev_attr_in4_max.dev_attr.attr,
367 &sensor_dev_attr_in4_min.dev_attr.attr,
368 &sensor_dev_attr_in5_alarm.dev_attr.attr,
369 &sensor_dev_attr_in5_input.dev_attr.attr,
370 &sensor_dev_attr_in5_max.dev_attr.attr,
371 &sensor_dev_attr_in5_min.dev_attr.attr,
372 &sensor_dev_attr_in6_alarm.dev_attr.attr,
373 &sensor_dev_attr_in6_input.dev_attr.attr,
374 &sensor_dev_attr_in6_max.dev_attr.attr,
375 &sensor_dev_attr_in6_min.dev_attr.attr,
376 &sensor_dev_attr_in7_alarm.dev_attr.attr,
377 &sensor_dev_attr_in7_input.dev_attr.attr,
378 &sensor_dev_attr_in7_max.dev_attr.attr,
379 &sensor_dev_attr_in7_min.dev_attr.attr,
380 &sensor_dev_attr_temp1_input.dev_attr.attr,
381 &sensor_dev_attr_temp1_max.dev_attr.attr,
382 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
383 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
384 NULL
385};
386
387static const struct attribute_group adc128_group = {
388 .attrs = adc128_attrs,
389 .is_visible = adc128_is_visible,
390};
391__ATTRIBUTE_GROUPS(adc128);
392
393static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
394{
395 int man_id, dev_id;
396
397 if (!i2c_check_functionality(client->adapter,
398 I2C_FUNC_SMBUS_BYTE_DATA |
399 I2C_FUNC_SMBUS_WORD_DATA))
400 return -ENODEV;
401
402 man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
403 dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
404 if (man_id != 0x01 || dev_id != 0x09)
405 return -ENODEV;
406
407
408 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
409 return -ENODEV;
410 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
411 return -ENODEV;
412 if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
413 return -ENODEV;
414 if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
415 return -ENODEV;
416 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
417 return -ENODEV;
418 if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
419 return -ENODEV;
420
421 strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
422
423 return 0;
424}
425
426static int adc128_init_client(struct adc128_data *data)
427{
428 struct i2c_client *client = data->client;
429 int err;
430
431
432
433
434
435 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
436 if (err)
437 return err;
438
439
440 if (data->mode != 0) {
441 err = i2c_smbus_write_byte_data(client,
442 ADC128_REG_CONFIG_ADV,
443 data->mode << 1);
444 if (err)
445 return err;
446 }
447
448
449 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
450 if (err)
451 return err;
452
453
454 if (data->regulator) {
455 err = i2c_smbus_write_byte_data(client,
456 ADC128_REG_CONFIG_ADV, 0x01);
457 if (err)
458 return err;
459 }
460
461 return 0;
462}
463
464static int adc128_probe(struct i2c_client *client,
465 const struct i2c_device_id *id)
466{
467 struct device *dev = &client->dev;
468 struct regulator *regulator;
469 struct device *hwmon_dev;
470 struct adc128_data *data;
471 int err, vref;
472
473 data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
474 if (!data)
475 return -ENOMEM;
476
477
478 regulator = devm_regulator_get_optional(dev, "vref");
479 if (!IS_ERR(regulator)) {
480 data->regulator = regulator;
481 err = regulator_enable(regulator);
482 if (err < 0)
483 return err;
484 vref = regulator_get_voltage(regulator);
485 if (vref < 0) {
486 err = vref;
487 goto error;
488 }
489 data->vref = DIV_ROUND_CLOSEST(vref, 1000);
490 } else {
491 data->vref = 2560;
492 }
493
494
495 if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
496 if (data->mode > 3) {
497 dev_err(dev, "invalid operation mode %d\n",
498 data->mode);
499 err = -EINVAL;
500 goto error;
501 }
502 } else {
503 err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
504 if (err < 0)
505 goto error;
506 data->mode = (err >> 1) & ADC128_REG_MASK;
507 }
508
509 data->client = client;
510 i2c_set_clientdata(client, data);
511 mutex_init(&data->update_lock);
512
513
514 err = adc128_init_client(data);
515 if (err < 0)
516 goto error;
517
518 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
519 data, adc128_groups);
520 if (IS_ERR(hwmon_dev)) {
521 err = PTR_ERR(hwmon_dev);
522 goto error;
523 }
524
525 return 0;
526
527error:
528 if (data->regulator)
529 regulator_disable(data->regulator);
530 return err;
531}
532
533static int adc128_remove(struct i2c_client *client)
534{
535 struct adc128_data *data = i2c_get_clientdata(client);
536
537 if (data->regulator)
538 regulator_disable(data->regulator);
539
540 return 0;
541}
542
543static const struct i2c_device_id adc128_id[] = {
544 { "adc128d818", 0 },
545 { }
546};
547MODULE_DEVICE_TABLE(i2c, adc128_id);
548
549static const struct of_device_id adc128_of_match[] = {
550 { .compatible = "ti,adc128d818" },
551 { },
552};
553MODULE_DEVICE_TABLE(of, adc128_of_match);
554
555static struct i2c_driver adc128_driver = {
556 .class = I2C_CLASS_HWMON,
557 .driver = {
558 .name = "adc128d818",
559 .of_match_table = of_match_ptr(adc128_of_match),
560 },
561 .probe = adc128_probe,
562 .remove = adc128_remove,
563 .id_table = adc128_id,
564 .detect = adc128_detect,
565 .address_list = normal_i2c,
566};
567
568module_i2c_driver(adc128_driver);
569
570MODULE_AUTHOR("Guenter Roeck");
571MODULE_DESCRIPTION("Driver for ADC128D818");
572MODULE_LICENSE("GPL");
573
