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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for TI ADC128D818 System Monitor with Temperature Sensor
4 *
5 * Copyright (c) 2014 Guenter Roeck
6 *
7 * Derived from lm80.c
8 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
9 * and Philip Edelbrock <phil@netroedge.com>
10 */
11
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/jiffies.h>
15#include <linux/i2c.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-sysfs.h>
18#include <linux/err.h>
19#include <linux/regulator/consumer.h>
20#include <linux/mutex.h>
21#include <linux/bitops.h>
22#include <linux/of.h>
23
24/* Addresses to scan
25 * The chip also supports addresses 0x35..0x37. Don't scan those addresses
26 * since they are also used by some EEPROMs, which may result in false
27 * positives.
28 */
29static const unsigned short normal_i2c[] = {
30 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
31
32/* registers */
33#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
34#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
35#define ADC128_REG_IN(nr) (0x20 + (nr))
36
37#define ADC128_REG_TEMP 0x27
38#define ADC128_REG_TEMP_MAX 0x38
39#define ADC128_REG_TEMP_HYST 0x39
40
41#define ADC128_REG_CONFIG 0x00
42#define ADC128_REG_ALARM 0x01
43#define ADC128_REG_MASK 0x03
44#define ADC128_REG_CONV_RATE 0x07
45#define ADC128_REG_ONESHOT 0x09
46#define ADC128_REG_SHUTDOWN 0x0a
47#define ADC128_REG_CONFIG_ADV 0x0b
48#define ADC128_REG_BUSY_STATUS 0x0c
49
50#define ADC128_REG_MAN_ID 0x3e
51#define ADC128_REG_DEV_ID 0x3f
52
53/* No. of voltage entries in adc128_attrs */
54#define ADC128_ATTR_NUM_VOLT (8 * 4)
55
56/* Voltage inputs visible per operation mode */
57static const u8 num_inputs[] = { 7, 8, 4, 6 };
58
59struct adc128_data {
60 struct i2c_client *client;
61 struct regulator *regulator;
62 int vref; /* Reference voltage in mV */
63 struct mutex update_lock;
64 u8 mode; /* Operation mode */
65 bool valid; /* true if following fields are valid */
66 unsigned long last_updated; /* In jiffies */
67
68 u16 in[3][8]; /* Register value, normalized to 12 bit
69 * 0: input voltage
70 * 1: min limit
71 * 2: max limit
72 */
73 s16 temp[3]; /* Register value, normalized to 9 bit
74 * 0: sensor 1: limit 2: hyst
75 */
76 u8 alarms; /* alarm register value */
77};
78
79static struct adc128_data *adc128_update_device(struct device *dev)
80{
81 struct adc128_data *data = dev_get_drvdata(dev);
82 struct i2c_client *client = data->client;
83 struct adc128_data *ret = data;
84 int i, rv;
85
86 mutex_lock(&data->update_lock);
87
88 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
89 for (i = 0; i < num_inputs[data->mode]; i++) {
90 rv = i2c_smbus_read_word_swapped(client,
91 ADC128_REG_IN(i));
92 if (rv < 0)
93 goto abort;
94 data->in[0][i] = rv >> 4;
95
96 rv = i2c_smbus_read_byte_data(client,
97 ADC128_REG_IN_MIN(i));
98 if (rv < 0)
99 goto abort;
100 data->in[1][i] = rv << 4;
101
102 rv = i2c_smbus_read_byte_data(client,
103 ADC128_REG_IN_MAX(i));
104 if (rv < 0)
105 goto abort;
106 data->in[2][i] = rv << 4;
107 }
108
109 if (data->mode != 1) {
110 rv = i2c_smbus_read_word_swapped(client,
111 ADC128_REG_TEMP);
112 if (rv < 0)
113 goto abort;
114 data->temp[0] = rv >> 7;
115
116 rv = i2c_smbus_read_byte_data(client,
117 ADC128_REG_TEMP_MAX);
118 if (rv < 0)
119 goto abort;
120 data->temp[1] = rv << 1;
121
122 rv = i2c_smbus_read_byte_data(client,
123 ADC128_REG_TEMP_HYST);
124 if (rv < 0)
125 goto abort;
126 data->temp[2] = rv << 1;
127 }
128
129 rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
130 if (rv < 0)
131 goto abort;
132 data->alarms |= rv;
133
134 data->last_updated = jiffies;
135 data->valid = true;
136 }
137 goto done;
138
139abort:
140 ret = ERR_PTR(rv);
141 data->valid = false;
142done:
143 mutex_unlock(&data->update_lock);
144 return ret;
145}
146
147static ssize_t adc128_in_show(struct device *dev,
148 struct device_attribute *attr, char *buf)
149{
150 struct adc128_data *data = adc128_update_device(dev);
151 int index = to_sensor_dev_attr_2(attr)->index;
152 int nr = to_sensor_dev_attr_2(attr)->nr;
153 int val;
154
155 if (IS_ERR(data))
156 return PTR_ERR(data);
157
158 val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
159 return sprintf(buf, "%d\n", val);
160}
161
162static ssize_t adc128_in_store(struct device *dev,
163 struct device_attribute *attr, const char *buf,
164 size_t count)
165{
166 struct adc128_data *data = dev_get_drvdata(dev);
167 int index = to_sensor_dev_attr_2(attr)->index;
168 int nr = to_sensor_dev_attr_2(attr)->nr;
169 u8 reg, regval;
170 long val;
171 int err;
172
173 err = kstrtol(buf, 10, &val);
174 if (err < 0)
175 return err;
176
177 mutex_lock(&data->update_lock);
178 /* 10 mV LSB on limit registers */
179 regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
180 data->in[index][nr] = regval << 4;
181 reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
182 i2c_smbus_write_byte_data(data->client, reg, regval);
183 mutex_unlock(&data->update_lock);
184
185 return count;
186}
187
188static ssize_t adc128_temp_show(struct device *dev,
189 struct device_attribute *attr, char *buf)
190{
191 struct adc128_data *data = adc128_update_device(dev);
192 int index = to_sensor_dev_attr(attr)->index;
193 int temp;
194
195 if (IS_ERR(data))
196 return PTR_ERR(data);
197
198 temp = sign_extend32(data->temp[index], 8);
199 return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
200}
201
202static ssize_t adc128_temp_store(struct device *dev,
203 struct device_attribute *attr,
204 const char *buf, size_t count)
205{
206 struct adc128_data *data = dev_get_drvdata(dev);
207 int index = to_sensor_dev_attr(attr)->index;
208 long val;
209 int err;
210 s8 regval;
211
212 err = kstrtol(buf, 10, &val);
213 if (err < 0)
214 return err;
215
216 mutex_lock(&data->update_lock);
217 regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
218 data->temp[index] = regval << 1;
219 i2c_smbus_write_byte_data(data->client,
220 index == 1 ? ADC128_REG_TEMP_MAX
221 : ADC128_REG_TEMP_HYST,
222 regval);
223 mutex_unlock(&data->update_lock);
224
225 return count;
226}
227
228static ssize_t adc128_alarm_show(struct device *dev,
229 struct device_attribute *attr, char *buf)
230{
231 struct adc128_data *data = adc128_update_device(dev);
232 int mask = 1 << to_sensor_dev_attr(attr)->index;
233 u8 alarms;
234
235 if (IS_ERR(data))
236 return PTR_ERR(data);
237
238 /*
239 * Clear an alarm after reporting it to user space. If it is still
240 * active, the next update sequence will set the alarm bit again.
241 */
242 alarms = data->alarms;
243 data->alarms &= ~mask;
244
245 return sprintf(buf, "%u\n", !!(alarms & mask));
246}
247
248static umode_t adc128_is_visible(struct kobject *kobj,
249 struct attribute *attr, int index)
250{
251 struct device *dev = kobj_to_dev(kobj);
252 struct adc128_data *data = dev_get_drvdata(dev);
253
254 if (index < ADC128_ATTR_NUM_VOLT) {
255 /* Voltage, visible according to num_inputs[] */
256 if (index >= num_inputs[data->mode] * 4)
257 return 0;
258 } else {
259 /* Temperature, visible if not in mode 1 */
260 if (data->mode == 1)
261 return 0;
262 }
263
264 return attr->mode;
265}
266
267static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
268static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
269static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);
270
271static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
272static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
273static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);
274
275static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
276static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
277static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);
278
279static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
280static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
281static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);
282
283static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
284static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
285static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);
286
287static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
288static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
289static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);
290
291static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
292static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
293static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);
294
295static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
296static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
297static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);
298
299static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
300static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
301static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);
302
303static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
304static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
305static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
306static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
307static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
308static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
309static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
310static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
311static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);
312
313static struct attribute *adc128_attrs[] = {
314 &sensor_dev_attr_in0_alarm.dev_attr.attr,
315 &sensor_dev_attr_in0_input.dev_attr.attr,
316 &sensor_dev_attr_in0_max.dev_attr.attr,
317 &sensor_dev_attr_in0_min.dev_attr.attr,
318 &sensor_dev_attr_in1_alarm.dev_attr.attr,
319 &sensor_dev_attr_in1_input.dev_attr.attr,
320 &sensor_dev_attr_in1_max.dev_attr.attr,
321 &sensor_dev_attr_in1_min.dev_attr.attr,
322 &sensor_dev_attr_in2_alarm.dev_attr.attr,
323 &sensor_dev_attr_in2_input.dev_attr.attr,
324 &sensor_dev_attr_in2_max.dev_attr.attr,
325 &sensor_dev_attr_in2_min.dev_attr.attr,
326 &sensor_dev_attr_in3_alarm.dev_attr.attr,
327 &sensor_dev_attr_in3_input.dev_attr.attr,
328 &sensor_dev_attr_in3_max.dev_attr.attr,
329 &sensor_dev_attr_in3_min.dev_attr.attr,
330 &sensor_dev_attr_in4_alarm.dev_attr.attr,
331 &sensor_dev_attr_in4_input.dev_attr.attr,
332 &sensor_dev_attr_in4_max.dev_attr.attr,
333 &sensor_dev_attr_in4_min.dev_attr.attr,
334 &sensor_dev_attr_in5_alarm.dev_attr.attr,
335 &sensor_dev_attr_in5_input.dev_attr.attr,
336 &sensor_dev_attr_in5_max.dev_attr.attr,
337 &sensor_dev_attr_in5_min.dev_attr.attr,
338 &sensor_dev_attr_in6_alarm.dev_attr.attr,
339 &sensor_dev_attr_in6_input.dev_attr.attr,
340 &sensor_dev_attr_in6_max.dev_attr.attr,
341 &sensor_dev_attr_in6_min.dev_attr.attr,
342 &sensor_dev_attr_in7_alarm.dev_attr.attr,
343 &sensor_dev_attr_in7_input.dev_attr.attr,
344 &sensor_dev_attr_in7_max.dev_attr.attr,
345 &sensor_dev_attr_in7_min.dev_attr.attr,
346 &sensor_dev_attr_temp1_input.dev_attr.attr,
347 &sensor_dev_attr_temp1_max.dev_attr.attr,
348 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
349 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
350 NULL
351};
352
353static const struct attribute_group adc128_group = {
354 .attrs = adc128_attrs,
355 .is_visible = adc128_is_visible,
356};
357__ATTRIBUTE_GROUPS(adc128);
358
359static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
360{
361 int man_id, dev_id;
362
363 if (!i2c_check_functionality(client->adapter,
364 I2C_FUNC_SMBUS_BYTE_DATA |
365 I2C_FUNC_SMBUS_WORD_DATA))
366 return -ENODEV;
367
368 man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
369 dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
370 if (man_id != 0x01 || dev_id != 0x09)
371 return -ENODEV;
372
373 /* Check unused bits for confirmation */
374 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
375 return -ENODEV;
376 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
377 return -ENODEV;
378 if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
379 return -ENODEV;
380 if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
381 return -ENODEV;
382 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
383 return -ENODEV;
384 if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
385 return -ENODEV;
386
387 strscpy(info->type, "adc128d818", I2C_NAME_SIZE);
388
389 return 0;
390}
391
392static int adc128_init_client(struct adc128_data *data)
393{
394 struct i2c_client *client = data->client;
395 int err;
396 u8 regval = 0x0;
397
398 /*
399 * Reset chip to defaults.
400 * This makes most other initializations unnecessary.
401 */
402 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
403 if (err)
404 return err;
405
406 /* Set operation mode, if non-default */
407 if (data->mode != 0)
408 regval |= data->mode << 1;
409
410 /* If external vref is selected, configure the chip to use it */
411 if (data->regulator)
412 regval |= 0x01;
413
414 /* Write advanced configuration register */
415 if (regval != 0x0) {
416 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV,
417 regval);
418 if (err)
419 return err;
420 }
421
422 /* Start monitoring */
423 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
424 if (err)
425 return err;
426
427 return 0;
428}
429
430static int adc128_probe(struct i2c_client *client)
431{
432 struct device *dev = &client->dev;
433 struct regulator *regulator;
434 struct device *hwmon_dev;
435 struct adc128_data *data;
436 int err, vref;
437
438 data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
439 if (!data)
440 return -ENOMEM;
441
442 /* vref is optional. If specified, is used as chip reference voltage */
443 regulator = devm_regulator_get_optional(dev, "vref");
444 if (!IS_ERR(regulator)) {
445 data->regulator = regulator;
446 err = regulator_enable(regulator);
447 if (err < 0)
448 return err;
449 vref = regulator_get_voltage(regulator);
450 if (vref < 0) {
451 err = vref;
452 goto error;
453 }
454 data->vref = DIV_ROUND_CLOSEST(vref, 1000);
455 } else {
456 data->vref = 2560; /* 2.56V, in mV */
457 }
458
459 /* Operation mode is optional. If unspecified, keep current mode */
460 if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
461 if (data->mode > 3) {
462 dev_err(dev, "invalid operation mode %d\n",
463 data->mode);
464 err = -EINVAL;
465 goto error;
466 }
467 } else {
468 err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
469 if (err < 0)
470 goto error;
471 data->mode = (err >> 1) & ADC128_REG_MASK;
472 }
473
474 data->client = client;
475 i2c_set_clientdata(client, data);
476 mutex_init(&data->update_lock);
477
478 /* Initialize the chip */
479 err = adc128_init_client(data);
480 if (err < 0)
481 goto error;
482
483 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
484 data, adc128_groups);
485 if (IS_ERR(hwmon_dev)) {
486 err = PTR_ERR(hwmon_dev);
487 goto error;
488 }
489
490 return 0;
491
492error:
493 if (data->regulator)
494 regulator_disable(data->regulator);
495 return err;
496}
497
498static void adc128_remove(struct i2c_client *client)
499{
500 struct adc128_data *data = i2c_get_clientdata(client);
501
502 if (data->regulator)
503 regulator_disable(data->regulator);
504}
505
506static const struct i2c_device_id adc128_id[] = {
507 { "adc128d818", 0 },
508 { }
509};
510MODULE_DEVICE_TABLE(i2c, adc128_id);
511
512static const struct of_device_id __maybe_unused adc128_of_match[] = {
513 { .compatible = "ti,adc128d818" },
514 { },
515};
516MODULE_DEVICE_TABLE(of, adc128_of_match);
517
518static struct i2c_driver adc128_driver = {
519 .class = I2C_CLASS_HWMON,
520 .driver = {
521 .name = "adc128d818",
522 .of_match_table = of_match_ptr(adc128_of_match),
523 },
524 .probe = adc128_probe,
525 .remove = adc128_remove,
526 .id_table = adc128_id,
527 .detect = adc128_detect,
528 .address_list = normal_i2c,
529};
530
531module_i2c_driver(adc128_driver);
532
533MODULE_AUTHOR("Guenter Roeck");
534MODULE_DESCRIPTION("Driver for ADC128D818");
535MODULE_LICENSE("GPL");
1/*
2 * Driver for TI ADC128D818 System Monitor with Temperature Sensor
3 *
4 * Copyright (c) 2014 Guenter Roeck
5 *
6 * Derived from lm80.c
7 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
8 * and Philip Edelbrock <phil@netroedge.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
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
32/* Addresses to scan
33 * The chip also supports addresses 0x35..0x37. Don't scan those addresses
34 * since they are also used by some EEPROMs, which may result in false
35 * positives.
36 */
37static const unsigned short normal_i2c[] = {
38 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
39
40/* registers */
41#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
42#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
43#define ADC128_REG_IN(nr) (0x20 + (nr))
44
45#define ADC128_REG_TEMP 0x27
46#define ADC128_REG_TEMP_MAX 0x38
47#define ADC128_REG_TEMP_HYST 0x39
48
49#define ADC128_REG_CONFIG 0x00
50#define ADC128_REG_ALARM 0x01
51#define ADC128_REG_MASK 0x03
52#define ADC128_REG_CONV_RATE 0x07
53#define ADC128_REG_ONESHOT 0x09
54#define ADC128_REG_SHUTDOWN 0x0a
55#define ADC128_REG_CONFIG_ADV 0x0b
56#define ADC128_REG_BUSY_STATUS 0x0c
57
58#define ADC128_REG_MAN_ID 0x3e
59#define ADC128_REG_DEV_ID 0x3f
60
61struct adc128_data {
62 struct i2c_client *client;
63 struct regulator *regulator;
64 int vref; /* Reference voltage in mV */
65 struct mutex update_lock;
66 bool valid; /* true if following fields are valid */
67 unsigned long last_updated; /* In jiffies */
68
69 u16 in[3][7]; /* Register value, normalized to 12 bit
70 * 0: input voltage
71 * 1: min limit
72 * 2: max limit
73 */
74 s16 temp[3]; /* Register value, normalized to 9 bit
75 * 0: sensor 1: limit 2: hyst
76 */
77 u8 alarms; /* alarm register value */
78};
79
80static struct adc128_data *adc128_update_device(struct device *dev)
81{
82 struct adc128_data *data = dev_get_drvdata(dev);
83 struct i2c_client *client = data->client;
84 struct adc128_data *ret = data;
85 int i, rv;
86
87 mutex_lock(&data->update_lock);
88
89 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
90 for (i = 0; i < 7; i++) {
91 rv = i2c_smbus_read_word_swapped(client,
92 ADC128_REG_IN(i));
93 if (rv < 0)
94 goto abort;
95 data->in[0][i] = rv >> 4;
96
97 rv = i2c_smbus_read_byte_data(client,
98 ADC128_REG_IN_MIN(i));
99 if (rv < 0)
100 goto abort;
101 data->in[1][i] = rv << 4;
102
103 rv = i2c_smbus_read_byte_data(client,
104 ADC128_REG_IN_MAX(i));
105 if (rv < 0)
106 goto abort;
107 data->in[2][i] = rv << 4;
108 }
109
110 rv = i2c_smbus_read_word_swapped(client, ADC128_REG_TEMP);
111 if (rv < 0)
112 goto abort;
113 data->temp[0] = rv >> 7;
114
115 rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_MAX);
116 if (rv < 0)
117 goto abort;
118 data->temp[1] = rv << 1;
119
120 rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_HYST);
121 if (rv < 0)
122 goto abort;
123 data->temp[2] = rv << 1;
124
125 rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
126 if (rv < 0)
127 goto abort;
128 data->alarms |= rv;
129
130 data->last_updated = jiffies;
131 data->valid = true;
132 }
133 goto done;
134
135abort:
136 ret = ERR_PTR(rv);
137 data->valid = false;
138done:
139 mutex_unlock(&data->update_lock);
140 return ret;
141}
142
143static ssize_t adc128_show_in(struct device *dev, struct device_attribute *attr,
144 char *buf)
145{
146 struct adc128_data *data = adc128_update_device(dev);
147 int index = to_sensor_dev_attr_2(attr)->index;
148 int nr = to_sensor_dev_attr_2(attr)->nr;
149 int val;
150
151 if (IS_ERR(data))
152 return PTR_ERR(data);
153
154 val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
155 return sprintf(buf, "%d\n", val);
156}
157
158static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr,
159 const char *buf, size_t count)
160{
161 struct adc128_data *data = dev_get_drvdata(dev);
162 int index = to_sensor_dev_attr_2(attr)->index;
163 int nr = to_sensor_dev_attr_2(attr)->nr;
164 u8 reg, regval;
165 long val;
166 int err;
167
168 err = kstrtol(buf, 10, &val);
169 if (err < 0)
170 return err;
171
172 mutex_lock(&data->update_lock);
173 /* 10 mV LSB on limit registers */
174 regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
175 data->in[index][nr] = regval << 4;
176 reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
177 i2c_smbus_write_byte_data(data->client, reg, regval);
178 mutex_unlock(&data->update_lock);
179
180 return count;
181}
182
183static ssize_t adc128_show_temp(struct device *dev,
184 struct device_attribute *attr, char *buf)
185{
186 struct adc128_data *data = adc128_update_device(dev);
187 int index = to_sensor_dev_attr(attr)->index;
188 int temp;
189
190 if (IS_ERR(data))
191 return PTR_ERR(data);
192
193 temp = sign_extend32(data->temp[index], 8);
194 return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
195}
196
197static ssize_t adc128_set_temp(struct device *dev,
198 struct device_attribute *attr,
199 const char *buf, size_t count)
200{
201 struct adc128_data *data = dev_get_drvdata(dev);
202 int index = to_sensor_dev_attr(attr)->index;
203 long val;
204 int err;
205 s8 regval;
206
207 err = kstrtol(buf, 10, &val);
208 if (err < 0)
209 return err;
210
211 mutex_lock(&data->update_lock);
212 regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
213 data->temp[index] = regval << 1;
214 i2c_smbus_write_byte_data(data->client,
215 index == 1 ? ADC128_REG_TEMP_MAX
216 : ADC128_REG_TEMP_HYST,
217 regval);
218 mutex_unlock(&data->update_lock);
219
220 return count;
221}
222
223static ssize_t adc128_show_alarm(struct device *dev,
224 struct device_attribute *attr, char *buf)
225{
226 struct adc128_data *data = adc128_update_device(dev);
227 int mask = 1 << to_sensor_dev_attr(attr)->index;
228 u8 alarms;
229
230 if (IS_ERR(data))
231 return PTR_ERR(data);
232
233 /*
234 * Clear an alarm after reporting it to user space. If it is still
235 * active, the next update sequence will set the alarm bit again.
236 */
237 alarms = data->alarms;
238 data->alarms &= ~mask;
239
240 return sprintf(buf, "%u\n", !!(alarms & mask));
241}
242
243static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
244 adc128_show_in, NULL, 0, 0);
245static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
246 adc128_show_in, adc128_set_in, 0, 1);
247static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
248 adc128_show_in, adc128_set_in, 0, 2);
249
250static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
251 adc128_show_in, NULL, 1, 0);
252static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
253 adc128_show_in, adc128_set_in, 1, 1);
254static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
255 adc128_show_in, adc128_set_in, 1, 2);
256
257static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
258 adc128_show_in, NULL, 2, 0);
259static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
260 adc128_show_in, adc128_set_in, 2, 1);
261static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
262 adc128_show_in, adc128_set_in, 2, 2);
263
264static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
265 adc128_show_in, NULL, 3, 0);
266static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
267 adc128_show_in, adc128_set_in, 3, 1);
268static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
269 adc128_show_in, adc128_set_in, 3, 2);
270
271static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
272 adc128_show_in, NULL, 4, 0);
273static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
274 adc128_show_in, adc128_set_in, 4, 1);
275static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
276 adc128_show_in, adc128_set_in, 4, 2);
277
278static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
279 adc128_show_in, NULL, 5, 0);
280static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
281 adc128_show_in, adc128_set_in, 5, 1);
282static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
283 adc128_show_in, adc128_set_in, 5, 2);
284
285static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
286 adc128_show_in, NULL, 6, 0);
287static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
288 adc128_show_in, adc128_set_in, 6, 1);
289static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
290 adc128_show_in, adc128_set_in, 6, 2);
291
292static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
293static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
294 adc128_show_temp, adc128_set_temp, 1);
295static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
296 adc128_show_temp, adc128_set_temp, 2);
297
298static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
299static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
300static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
301static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
302static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
303static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
304static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
305static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
306
307static struct attribute *adc128_attrs[] = {
308 &sensor_dev_attr_in0_min.dev_attr.attr,
309 &sensor_dev_attr_in1_min.dev_attr.attr,
310 &sensor_dev_attr_in2_min.dev_attr.attr,
311 &sensor_dev_attr_in3_min.dev_attr.attr,
312 &sensor_dev_attr_in4_min.dev_attr.attr,
313 &sensor_dev_attr_in5_min.dev_attr.attr,
314 &sensor_dev_attr_in6_min.dev_attr.attr,
315 &sensor_dev_attr_in0_max.dev_attr.attr,
316 &sensor_dev_attr_in1_max.dev_attr.attr,
317 &sensor_dev_attr_in2_max.dev_attr.attr,
318 &sensor_dev_attr_in3_max.dev_attr.attr,
319 &sensor_dev_attr_in4_max.dev_attr.attr,
320 &sensor_dev_attr_in5_max.dev_attr.attr,
321 &sensor_dev_attr_in6_max.dev_attr.attr,
322 &sensor_dev_attr_in0_input.dev_attr.attr,
323 &sensor_dev_attr_in1_input.dev_attr.attr,
324 &sensor_dev_attr_in2_input.dev_attr.attr,
325 &sensor_dev_attr_in3_input.dev_attr.attr,
326 &sensor_dev_attr_in4_input.dev_attr.attr,
327 &sensor_dev_attr_in5_input.dev_attr.attr,
328 &sensor_dev_attr_in6_input.dev_attr.attr,
329 &sensor_dev_attr_temp1_input.dev_attr.attr,
330 &sensor_dev_attr_temp1_max.dev_attr.attr,
331 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
332 &sensor_dev_attr_in0_alarm.dev_attr.attr,
333 &sensor_dev_attr_in1_alarm.dev_attr.attr,
334 &sensor_dev_attr_in2_alarm.dev_attr.attr,
335 &sensor_dev_attr_in3_alarm.dev_attr.attr,
336 &sensor_dev_attr_in4_alarm.dev_attr.attr,
337 &sensor_dev_attr_in5_alarm.dev_attr.attr,
338 &sensor_dev_attr_in6_alarm.dev_attr.attr,
339 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
340 NULL
341};
342ATTRIBUTE_GROUPS(adc128);
343
344static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
345{
346 int man_id, dev_id;
347
348 if (!i2c_check_functionality(client->adapter,
349 I2C_FUNC_SMBUS_BYTE_DATA |
350 I2C_FUNC_SMBUS_WORD_DATA))
351 return -ENODEV;
352
353 man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
354 dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
355 if (man_id != 0x01 || dev_id != 0x09)
356 return -ENODEV;
357
358 /* Check unused bits for confirmation */
359 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
360 return -ENODEV;
361 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
362 return -ENODEV;
363 if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
364 return -ENODEV;
365 if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
366 return -ENODEV;
367 if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
368 return -ENODEV;
369 if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
370 return -ENODEV;
371
372 strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
373
374 return 0;
375}
376
377static int adc128_init_client(struct adc128_data *data)
378{
379 struct i2c_client *client = data->client;
380 int err;
381
382 /*
383 * Reset chip to defaults.
384 * This makes most other initializations unnecessary.
385 */
386 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
387 if (err)
388 return err;
389
390 /* Start monitoring */
391 err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
392 if (err)
393 return err;
394
395 /* If external vref is selected, configure the chip to use it */
396 if (data->regulator) {
397 err = i2c_smbus_write_byte_data(client,
398 ADC128_REG_CONFIG_ADV, 0x01);
399 if (err)
400 return err;
401 }
402
403 return 0;
404}
405
406static int adc128_probe(struct i2c_client *client,
407 const struct i2c_device_id *id)
408{
409 struct device *dev = &client->dev;
410 struct regulator *regulator;
411 struct device *hwmon_dev;
412 struct adc128_data *data;
413 int err, vref;
414
415 data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
416 if (!data)
417 return -ENOMEM;
418
419 /* vref is optional. If specified, is used as chip reference voltage */
420 regulator = devm_regulator_get_optional(dev, "vref");
421 if (!IS_ERR(regulator)) {
422 data->regulator = regulator;
423 err = regulator_enable(regulator);
424 if (err < 0)
425 return err;
426 vref = regulator_get_voltage(regulator);
427 if (vref < 0) {
428 err = vref;
429 goto error;
430 }
431 data->vref = DIV_ROUND_CLOSEST(vref, 1000);
432 } else {
433 data->vref = 2560; /* 2.56V, in mV */
434 }
435
436 data->client = client;
437 i2c_set_clientdata(client, data);
438 mutex_init(&data->update_lock);
439
440 /* Initialize the chip */
441 err = adc128_init_client(data);
442 if (err < 0)
443 goto error;
444
445 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
446 data, adc128_groups);
447 if (IS_ERR(hwmon_dev)) {
448 err = PTR_ERR(hwmon_dev);
449 goto error;
450 }
451
452 return 0;
453
454error:
455 if (data->regulator)
456 regulator_disable(data->regulator);
457 return err;
458}
459
460static int adc128_remove(struct i2c_client *client)
461{
462 struct adc128_data *data = i2c_get_clientdata(client);
463
464 if (data->regulator)
465 regulator_disable(data->regulator);
466
467 return 0;
468}
469
470static const struct i2c_device_id adc128_id[] = {
471 { "adc128d818", 0 },
472 { }
473};
474MODULE_DEVICE_TABLE(i2c, adc128_id);
475
476static struct i2c_driver adc128_driver = {
477 .class = I2C_CLASS_HWMON,
478 .driver = {
479 .name = "adc128d818",
480 },
481 .probe = adc128_probe,
482 .remove = adc128_remove,
483 .id_table = adc128_id,
484 .detect = adc128_detect,
485 .address_list = normal_i2c,
486};
487
488module_i2c_driver(adc128_driver);
489
490MODULE_AUTHOR("Guenter Roeck");
491MODULE_DESCRIPTION("Driver for ADC128D818");
492MODULE_LICENSE("GPL");