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Guenter Roeckb4c9c1a2014-01-24 22:25:33 -08001/*
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>
Rasmus Villemoes2c3b1182015-01-22 23:44:14 +010030#include <linux/bitops.h>
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -080031
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
Rasmus Villemoes2c3b1182015-01-22 23:44:14 +0100193 temp = sign_extend32(data->temp[index], 8);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800194 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700243static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
244 adc128_show_in, NULL, 0, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800245static 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700250static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
251 adc128_show_in, NULL, 1, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800252static 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700257static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
258 adc128_show_in, NULL, 2, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800259static 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700264static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
265 adc128_show_in, NULL, 3, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800266static 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700271static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
272 adc128_show_in, NULL, 4, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800273static 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700278static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
279 adc128_show_in, NULL, 5, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800280static 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
Guenter Roeck7fe73812014-07-07 07:10:10 -0700285static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
286 adc128_show_in, NULL, 6, 0);
Guenter Roeckb4c9c1a2014-01-24 22:25:33 -0800287static 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");