aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/adc128d818.c
blob: ad2b47e403452a230c9f3e57454517a25e63289f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
/*
 * Driver for TI ADC128D818 System Monitor with Temperature Sensor
 *
 * Copyright (c) 2014 Guenter Roeck
 *
 * Derived from lm80.c
 * Copyright (C) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
 *			     and Philip Edelbrock <phil@netroedge.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <linux/bitops.h>

/* Addresses to scan
 * The chip also supports addresses 0x35..0x37. Don't scan those addresses
 * since they are also used by some EEPROMs, which may result in false
 * positives.
 */
static const unsigned short normal_i2c[] = {
	0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };

/* registers */
#define ADC128_REG_IN_MAX(nr)		(0x2a + (nr) * 2)
#define ADC128_REG_IN_MIN(nr)		(0x2b + (nr) * 2)
#define ADC128_REG_IN(nr)		(0x20 + (nr))

#define ADC128_REG_TEMP			0x27
#define ADC128_REG_TEMP_MAX		0x38
#define ADC128_REG_TEMP_HYST		0x39

#define ADC128_REG_CONFIG		0x00
#define ADC128_REG_ALARM		0x01
#define ADC128_REG_MASK			0x03
#define ADC128_REG_CONV_RATE		0x07
#define ADC128_REG_ONESHOT		0x09
#define ADC128_REG_SHUTDOWN		0x0a
#define ADC128_REG_CONFIG_ADV		0x0b
#define ADC128_REG_BUSY_STATUS		0x0c

#define ADC128_REG_MAN_ID		0x3e
#define ADC128_REG_DEV_ID		0x3f

struct adc128_data {
	struct i2c_client *client;
	struct regulator *regulator;
	int vref;		/* Reference voltage in mV */
	struct mutex update_lock;
	bool valid;		/* true if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u16 in[3][7];		/* Register value, normalized to 12 bit
				 * 0: input voltage
				 * 1: min limit
				 * 2: max limit
				 */
	s16 temp[3];		/* Register value, normalized to 9 bit
				 * 0: sensor 1: limit 2: hyst
				 */
	u8 alarms;		/* alarm register value */
};

static struct adc128_data *adc128_update_device(struct device *dev)
{
	struct adc128_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	struct adc128_data *ret = data;
	int i, rv;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		for (i = 0; i < 7; i++) {
			rv = i2c_smbus_read_word_swapped(client,
							 ADC128_REG_IN(i));
			if (rv < 0)
				goto abort;
			data->in[0][i] = rv >> 4;

			rv = i2c_smbus_read_byte_data(client,
						      ADC128_REG_IN_MIN(i));
			if (rv < 0)
				goto abort;
			data->in[1][i] = rv << 4;

			rv = i2c_smbus_read_byte_data(client,
						      ADC128_REG_IN_MAX(i));
			if (rv < 0)
				goto abort;
			data->in[2][i] = rv << 4;
		}

		rv = i2c_smbus_read_word_swapped(client, ADC128_REG_TEMP);
		if (rv < 0)
			goto abort;
		data->temp[0] = rv >> 7;

		rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_MAX);
		if (rv < 0)
			goto abort;
		data->temp[1] = rv << 1;

		rv = i2c_smbus_read_byte_data(client, ADC128_REG_TEMP_HYST);
		if (rv < 0)
			goto abort;
		data->temp[2] = rv << 1;

		rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
		if (rv < 0)
			goto abort;
		data->alarms |= rv;

		data->last_updated = jiffies;
		data->valid = true;
	}
	goto done;

abort:
	ret = ERR_PTR(rv);
	data->valid = false;
done:
	mutex_unlock(&data->update_lock);
	return ret;
}

static ssize_t adc128_show_in(struct device *dev, struct device_attribute *attr,
			      char *buf)
{
	struct adc128_data *data = adc128_update_device(dev);
	int index = to_sensor_dev_attr_2(attr)->index;
	int nr = to_sensor_dev_attr_2(attr)->nr;
	int val;

	if (IS_ERR(data))
		return PTR_ERR(data);

	val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
	return sprintf(buf, "%d\n", val);
}

static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct adc128_data *data = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr_2(attr)->index;
	int nr = to_sensor_dev_attr_2(attr)->nr;
	u8 reg, regval;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	/* 10 mV LSB on limit registers */
	regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
	data->in[index][nr] = regval << 4;
	reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
	i2c_smbus_write_byte_data(data->client, reg, regval);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t adc128_show_temp(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct adc128_data *data = adc128_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;
	int temp;

	if (IS_ERR(data))
		return PTR_ERR(data);

	temp = sign_extend32(data->temp[index], 8);
	return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
}

static ssize_t adc128_set_temp(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf, size_t count)
{
	struct adc128_data *data = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr(attr)->index;
	long val;
	int err;
	s8 regval;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
	data->temp[index] = regval << 1;
	i2c_smbus_write_byte_data(data->client,
				  index == 1 ? ADC128_REG_TEMP_MAX
					     : ADC128_REG_TEMP_HYST,
				  regval);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t adc128_show_alarm(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct adc128_data *data = adc128_update_device(dev);
	int mask = 1 << to_sensor_dev_attr(attr)->index;
	u8 alarms;

	if (IS_ERR(data))
		return PTR_ERR(data);

	/*
	 * Clear an alarm after reporting it to user space. If it is still
	 * active, the next update sequence will set the alarm bit again.
	 */
	alarms = data->alarms;
	data->alarms &= ~mask;

	return sprintf(buf, "%u\n", !!(alarms & mask));
}

static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
			    adc128_show_in, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 0, 1);
static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 0, 2);

static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
			    adc128_show_in, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 1, 1);
static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 1, 2);

static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
			    adc128_show_in, NULL, 2, 0);
static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 2, 1);
static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 2, 2);

static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
			    adc128_show_in, NULL, 3, 0);
static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 3, 1);
static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 3, 2);

static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
			    adc128_show_in, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 4, 1);
static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 4, 2);

static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
			    adc128_show_in, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 5, 1);
static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 5, 2);

static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
			    adc128_show_in, NULL, 6, 0);
static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 6, 1);
static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
			    adc128_show_in, adc128_set_in, 6, 2);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
			  adc128_show_temp, adc128_set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
			  adc128_show_temp, adc128_set_temp, 2);

static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);

static struct attribute *adc128_attrs[] = {
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(adc128);

static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
{
	int man_id, dev_id;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

	man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
	dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
	if (man_id != 0x01 || dev_id != 0x09)
		return -ENODEV;

	/* Check unused bits for confirmation */
	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
		return -ENODEV;
	if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
		return -ENODEV;

	strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);

	return 0;
}

static int adc128_init_client(struct adc128_data *data)
{
	struct i2c_client *client = data->client;
	int err;

	/*
	 * Reset chip to defaults.
	 * This makes most other initializations unnecessary.
	 */
	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
	if (err)
		return err;

	/* Start monitoring */
	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
	if (err)
		return err;

	/* If external vref is selected, configure the chip to use it */
	if (data->regulator) {
		err = i2c_smbus_write_byte_data(client,
						ADC128_REG_CONFIG_ADV, 0x01);
		if (err)
			return err;
	}

	return 0;
}

static int adc128_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct regulator *regulator;
	struct device *hwmon_dev;
	struct adc128_data *data;
	int err, vref;

	data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* vref is optional. If specified, is used as chip reference voltage */
	regulator = devm_regulator_get_optional(dev, "vref");
	if (!IS_ERR(regulator)) {
		data->regulator = regulator;
		err = regulator_enable(regulator);
		if (err < 0)
			return err;
		vref = regulator_get_voltage(regulator);
		if (vref < 0) {
			err = vref;
			goto error;
		}
		data->vref = DIV_ROUND_CLOSEST(vref, 1000);
	} else {
		data->vref = 2560;	/* 2.56V, in mV */
	}

	data->client = client;
	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/* Initialize the chip */
	err = adc128_init_client(data);
	if (err < 0)
		goto error;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data, adc128_groups);
	if (IS_ERR(hwmon_dev)) {
		err = PTR_ERR(hwmon_dev);
		goto error;
	}

	return 0;

error:
	if (data->regulator)
		regulator_disable(data->regulator);
	return err;
}

static int adc128_remove(struct i2c_client *client)
{
	struct adc128_data *data = i2c_get_clientdata(client);

	if (data->regulator)
		regulator_disable(data->regulator);

	return 0;
}

static const struct i2c_device_id adc128_id[] = {
	{ "adc128d818", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adc128_id);

static struct i2c_driver adc128_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "adc128d818",
	},
	.probe		= adc128_probe,
	.remove		= adc128_remove,
	.id_table	= adc128_id,
	.detect		= adc128_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(adc128_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("Driver for ADC128D818");
MODULE_LICENSE("GPL");