summaryrefslogtreecommitdiff
path: root/drivers/hwmon/tmp401.c
blob: 97bf34494d84678723382b1a17e75c996709dccf (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
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
/* tmp401.c
 *
 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
 * Preliminary tmp411 support by:
 * Gabriel Konat, Sander Leget, Wouter Willems
 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
 *
 * Note this IC is in some aspect similar to the LM90, but it has quite a
 * few differences too, for example the local temp has a higher resolution
 * and thus has 16 bits registers for its value and limit instead of 8 bits.
 */

#include <linux/module.h>
#include <linux/init.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/mutex.h>
#include <linux/sysfs.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };

enum chips { tmp401, tmp411 };

/*
 * The TMP401 registers, note some registers have different addresses for
 * reading and writing
 */
#define TMP401_STATUS				0x02
#define TMP401_CONFIG_READ			0x03
#define TMP401_CONFIG_WRITE			0x09
#define TMP401_CONVERSION_RATE_READ		0x04
#define TMP401_CONVERSION_RATE_WRITE		0x0A
#define TMP401_TEMP_CRIT_HYST			0x21
#define TMP401_CONSECUTIVE_ALERT		0x22
#define TMP401_MANUFACTURER_ID_REG		0xFE
#define TMP401_DEVICE_ID_REG			0xFF
#define TMP411_N_FACTOR_REG			0x18

static const u8 TMP401_TEMP_MSB[2]			= { 0x00, 0x01 };
static const u8 TMP401_TEMP_LSB[2]			= { 0x15, 0x10 };
static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2]	= { 0x06, 0x08 };
static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2]	= { 0x0C, 0x0E };
static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2]		= { 0x17, 0x14 };
static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2]	= { 0x05, 0x07 };
static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2]	= { 0x0B, 0x0D };
static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2]		= { 0x16, 0x13 };
/* These are called the THERM limit / hysteresis / mask in the datasheet */
static const u8 TMP401_TEMP_CRIT_LIMIT[2]		= { 0x20, 0x19 };

static const u8 TMP411_TEMP_LOWEST_MSB[2]		= { 0x30, 0x34 };
static const u8 TMP411_TEMP_LOWEST_LSB[2]		= { 0x31, 0x35 };
static const u8 TMP411_TEMP_HIGHEST_MSB[2]		= { 0x32, 0x36 };
static const u8 TMP411_TEMP_HIGHEST_LSB[2]		= { 0x33, 0x37 };

/* Flags */
#define TMP401_CONFIG_RANGE		0x04
#define TMP401_CONFIG_SHUTDOWN		0x40
#define TMP401_STATUS_LOCAL_CRIT		0x01
#define TMP401_STATUS_REMOTE_CRIT		0x02
#define TMP401_STATUS_REMOTE_OPEN		0x04
#define TMP401_STATUS_REMOTE_LOW		0x08
#define TMP401_STATUS_REMOTE_HIGH		0x10
#define TMP401_STATUS_LOCAL_LOW		0x20
#define TMP401_STATUS_LOCAL_HIGH		0x40

/* Manufacturer / Device ID's */
#define TMP401_MANUFACTURER_ID			0x55
#define TMP401_DEVICE_ID			0x11
#define TMP411_DEVICE_ID			0x12

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id tmp401_id[] = {
	{ "tmp401", tmp401 },
	{ "tmp411", tmp411 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tmp401_id);

/*
 * Client data (each client gets its own)
 */

struct tmp401_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */
	enum chips kind;

	/* register values */
	u8 status;
	u8 config;
	u16 temp[2];
	u16 temp_low[2];
	u16 temp_high[2];
	u8 temp_crit[2];
	u8 temp_crit_hyst;
	u16 temp_lowest[2];
	u16 temp_highest[2];
};

/*
 * Sysfs attr show / store functions
 */

static int tmp401_register_to_temp(u16 reg, u8 config)
{
	int temp = reg;

	if (config & TMP401_CONFIG_RANGE)
		temp -= 64 * 256;

	return (temp * 625 + 80) / 160;
}

static u16 tmp401_temp_to_register(long temp, u8 config)
{
	if (config & TMP401_CONFIG_RANGE) {
		temp = clamp_val(temp, -64000, 191000);
		temp += 64000;
	} else
		temp = clamp_val(temp, 0, 127000);

	return (temp * 160 + 312) / 625;
}

static int tmp401_crit_register_to_temp(u8 reg, u8 config)
{
	int temp = reg;

	if (config & TMP401_CONFIG_RANGE)
		temp -= 64;

	return temp * 1000;
}

static u8 tmp401_crit_temp_to_register(long temp, u8 config)
{
	if (config & TMP401_CONFIG_RANGE) {
		temp = clamp_val(temp, -64000, 191000);
		temp += 64000;
	} else
		temp = clamp_val(temp, 0, 127000);

	return (temp + 500) / 1000;
}

static struct tmp401_data *tmp401_update_device_reg16(
	struct i2c_client *client, struct tmp401_data *data)
{
	int i;

	for (i = 0; i < 2; i++) {
		/*
		 * High byte must be read first immediately followed
		 * by the low byte
		 */
		data->temp[i] = i2c_smbus_read_byte_data(client,
			TMP401_TEMP_MSB[i]) << 8;
		data->temp[i] |= i2c_smbus_read_byte_data(client,
			TMP401_TEMP_LSB[i]);
		data->temp_low[i] = i2c_smbus_read_byte_data(client,
			TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
		data->temp_low[i] |= i2c_smbus_read_byte_data(client,
			TMP401_TEMP_LOW_LIMIT_LSB[i]);
		data->temp_high[i] = i2c_smbus_read_byte_data(client,
			TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
		data->temp_high[i] |= i2c_smbus_read_byte_data(client,
			TMP401_TEMP_HIGH_LIMIT_LSB[i]);
		data->temp_crit[i] = i2c_smbus_read_byte_data(client,
			TMP401_TEMP_CRIT_LIMIT[i]);

		if (data->kind == tmp411) {
			data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
				TMP411_TEMP_LOWEST_MSB[i]) << 8;
			data->temp_lowest[i] |= i2c_smbus_read_byte_data(
				client, TMP411_TEMP_LOWEST_LSB[i]);

			data->temp_highest[i] = i2c_smbus_read_byte_data(
				client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
			data->temp_highest[i] |= i2c_smbus_read_byte_data(
				client, TMP411_TEMP_HIGHEST_LSB[i]);
		}
	}
	return data;
}

static struct tmp401_data *tmp401_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct tmp401_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
		data->config = i2c_smbus_read_byte_data(client,
						TMP401_CONFIG_READ);
		tmp401_update_device_reg16(client, data);

		data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
						TMP401_TEMP_CRIT_HYST);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static ssize_t show_temp_value(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	return sprintf(buf, "%d\n",
		tmp401_register_to_temp(data->temp[index], data->config));
}

static ssize_t show_temp_min(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	return sprintf(buf, "%d\n",
		tmp401_register_to_temp(data->temp_low[index], data->config));
}

static ssize_t show_temp_max(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	return sprintf(buf, "%d\n",
		tmp401_register_to_temp(data->temp_high[index], data->config));
}

static ssize_t show_temp_crit(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	return sprintf(buf, "%d\n",
			tmp401_crit_register_to_temp(data->temp_crit[index],
							data->config));
}

static ssize_t show_temp_crit_hyst(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int temp, index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	mutex_lock(&data->update_lock);
	temp = tmp401_crit_register_to_temp(data->temp_crit[index],
						data->config);
	temp -= data->temp_crit_hyst * 1000;
	mutex_unlock(&data->update_lock);

	return sprintf(buf, "%d\n", temp);
}

static ssize_t show_temp_lowest(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	return sprintf(buf, "%d\n",
		tmp401_register_to_temp(data->temp_lowest[index],
					data->config));
}

static ssize_t show_temp_highest(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	return sprintf(buf, "%d\n",
		tmp401_register_to_temp(data->temp_highest[index],
					data->config));
}

static ssize_t show_status(struct device *dev,
	struct device_attribute *devattr, char *buf)
{
	int mask = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);

	if (data->status & mask)
		return sprintf(buf, "1\n");
	else
		return sprintf(buf, "0\n");
}

static ssize_t store_temp_min(struct device *dev, struct device_attribute
	*devattr, const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);
	long val;
	u16 reg;

	if (kstrtol(buf, 10, &val))
		return -EINVAL;

	reg = tmp401_temp_to_register(val, data->config);

	mutex_lock(&data->update_lock);

	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);

	data->temp_low[index] = reg;

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t store_temp_max(struct device *dev, struct device_attribute
	*devattr, const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);
	long val;
	u16 reg;

	if (kstrtol(buf, 10, &val))
		return -EINVAL;

	reg = tmp401_temp_to_register(val, data->config);

	mutex_lock(&data->update_lock);

	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);

	data->temp_high[index] = reg;

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t store_temp_crit(struct device *dev, struct device_attribute
	*devattr, const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);
	long val;
	u8 reg;

	if (kstrtol(buf, 10, &val))
		return -EINVAL;

	reg = tmp401_crit_temp_to_register(val, data->config);

	mutex_lock(&data->update_lock);

	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP401_TEMP_CRIT_LIMIT[index], reg);

	data->temp_crit[index] = reg;

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
	*devattr, const char *buf, size_t count)
{
	int temp, index = to_sensor_dev_attr(devattr)->index;
	struct tmp401_data *data = tmp401_update_device(dev);
	long val;
	u8 reg;

	if (kstrtol(buf, 10, &val))
		return -EINVAL;

	if (data->config & TMP401_CONFIG_RANGE)
		val = clamp_val(val, -64000, 191000);
	else
		val = clamp_val(val, 0, 127000);

	mutex_lock(&data->update_lock);
	temp = tmp401_crit_register_to_temp(data->temp_crit[index],
						data->config);
	val = clamp_val(val, temp - 255000, temp);
	reg = ((temp - val) + 500) / 1000;

	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP401_TEMP_CRIT_HYST, reg);

	data->temp_crit_hyst = reg;

	mutex_unlock(&data->update_lock);

	return count;
}

/*
 * Resets the historical measurements of minimum and maximum temperatures.
 * This is done by writing any value to any of the minimum/maximum registers
 * (0x30-0x37).
 */
static ssize_t reset_temp_history(struct device *dev,
	struct device_attribute	*devattr, const char *buf, size_t count)
{
	long val;

	if (kstrtol(buf, 10, &val))
		return -EINVAL;

	if (val != 1) {
		dev_err(dev,
			"temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
			val);
		return -EINVAL;
	}
	i2c_smbus_write_byte_data(to_i2c_client(dev),
		TMP411_TEMP_LOWEST_MSB[0], val);

	return count;
}

static struct sensor_device_attribute tmp401_attr[] = {
	SENSOR_ATTR(temp1_input, S_IRUGO, show_temp_value, NULL, 0),
	SENSOR_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
		    store_temp_min, 0),
	SENSOR_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
		    store_temp_max, 0),
	SENSOR_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
		    store_temp_crit, 0),
	SENSOR_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_crit_hyst,
		    store_temp_crit_hyst, 0),
	SENSOR_ATTR(temp1_min_alarm, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_LOCAL_LOW),
	SENSOR_ATTR(temp1_max_alarm, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_LOCAL_HIGH),
	SENSOR_ATTR(temp1_crit_alarm, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_LOCAL_CRIT),
	SENSOR_ATTR(temp2_input, S_IRUGO, show_temp_value, NULL, 1),
	SENSOR_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
		    store_temp_min, 1),
	SENSOR_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
		    store_temp_max, 1),
	SENSOR_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
		    store_temp_crit, 1),
	SENSOR_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst, NULL, 1),
	SENSOR_ATTR(temp2_fault, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_REMOTE_OPEN),
	SENSOR_ATTR(temp2_min_alarm, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_REMOTE_LOW),
	SENSOR_ATTR(temp2_max_alarm, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_REMOTE_HIGH),
	SENSOR_ATTR(temp2_crit_alarm, S_IRUGO, show_status, NULL,
		    TMP401_STATUS_REMOTE_CRIT),
};

/*
 * Additional features of the TMP411 chip.
 * The TMP411 stores the minimum and maximum
 * temperature measured since power-on, chip-reset, or
 * minimum and maximum register reset for both the local
 * and remote channels.
 */
static struct sensor_device_attribute tmp411_attr[] = {
	SENSOR_ATTR(temp1_highest, S_IRUGO, show_temp_highest, NULL, 0),
	SENSOR_ATTR(temp1_lowest, S_IRUGO, show_temp_lowest, NULL, 0),
	SENSOR_ATTR(temp2_highest, S_IRUGO, show_temp_highest, NULL, 1),
	SENSOR_ATTR(temp2_lowest, S_IRUGO, show_temp_lowest, NULL, 1),
	SENSOR_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history, 0),
};

/*
 * Begin non sysfs callback code (aka Real code)
 */

static void tmp401_init_client(struct i2c_client *client)
{
	int config, config_orig;

	/* Set the conversion rate to 2 Hz */
	i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);

	/* Start conversions (disable shutdown if necessary) */
	config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
	if (config < 0) {
		dev_warn(&client->dev, "Initialization failed!\n");
		return;
	}

	config_orig = config;
	config &= ~TMP401_CONFIG_SHUTDOWN;

	if (config != config_orig)
		i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
}

static int tmp401_detect(struct i2c_client *client,
			 struct i2c_board_info *info)
{
	enum chips kind;
	struct i2c_adapter *adapter = client->adapter;
	u8 reg;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	/* Detect and identify the chip */
	reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
	if (reg != TMP401_MANUFACTURER_ID)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);

	switch (reg) {
	case TMP401_DEVICE_ID:
		kind = tmp401;
		break;
	case TMP411_DEVICE_ID:
		kind = tmp411;
		break;
	default:
		return -ENODEV;
	}

	reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
	if (reg & 0x1b)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
	/* Datasheet says: 0x1-0x6 */
	if (reg > 15)
		return -ENODEV;

	strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);

	return 0;
}

static int tmp401_remove(struct i2c_client *client)
{
	struct tmp401_data *data = i2c_get_clientdata(client);
	int i;

	if (data->hwmon_dev)
		hwmon_device_unregister(data->hwmon_dev);

	for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
		device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);

	if (data->kind == tmp411) {
		for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
			device_remove_file(&client->dev,
					   &tmp411_attr[i].dev_attr);
	}

	return 0;
}

static int tmp401_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int i, err = 0;
	struct tmp401_data *data;
	const char *names[] = { "TMP401", "TMP411" };

	data = devm_kzalloc(&client->dev, sizeof(struct tmp401_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Initialize the TMP401 chip */
	tmp401_init_client(client);

	/* Register sysfs hooks */
	for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) {
		err = device_create_file(&client->dev,
					 &tmp401_attr[i].dev_attr);
		if (err)
			goto exit_remove;
	}

	/* Register additional tmp411 sysfs hooks */
	if (data->kind == tmp411) {
		for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
			err = device_create_file(&client->dev,
						 &tmp411_attr[i].dev_attr);
			if (err)
				goto exit_remove;
		}
	}

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		data->hwmon_dev = NULL;
		goto exit_remove;
	}

	dev_info(&client->dev, "Detected TI %s chip\n", names[data->kind]);

	return 0;

exit_remove:
	tmp401_remove(client);
	return err;
}

static struct i2c_driver tmp401_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "tmp401",
	},
	.probe		= tmp401_probe,
	.remove		= tmp401_remove,
	.id_table	= tmp401_id,
	.detect		= tmp401_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(tmp401_driver);

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
MODULE_LICENSE("GPL");