summaryrefslogtreecommitdiff
path: root/drivers/hwmon/nct7904.c
blob: 58a9574454849ef98c4df6011781391e66ba601a (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * nct7904.c - driver for Nuvoton NCT7904D.
 *
 * Copyright (c) 2015 Kontron
 * Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/hwmon.h>

#define VENDOR_ID_REG		0x7A	/* Any bank */
#define NUVOTON_ID		0x50
#define CHIP_ID_REG		0x7B	/* Any bank */
#define NCT7904_ID		0xC5
#define DEVICE_ID_REG		0x7C	/* Any bank */

#define BANK_SEL_REG		0xFF
#define BANK_0			0x00
#define BANK_1			0x01
#define BANK_2			0x02
#define BANK_3			0x03
#define BANK_4			0x04
#define BANK_MAX		0x04

#define FANIN_MAX		12	/* Counted from 1 */
#define VSEN_MAX		21	/* VSEN1..14, 3VDD, VBAT, V3VSB,
					   LTD (not a voltage), VSEN17..19 */
#define FANCTL_MAX		4	/* Counted from 1 */
#define TCPU_MAX		8	/* Counted from 1 */
#define TEMP_MAX		4	/* Counted from 1 */

#define VT_ADC_CTRL0_REG	0x20	/* Bank 0 */
#define VT_ADC_CTRL1_REG	0x21	/* Bank 0 */
#define VT_ADC_CTRL2_REG	0x22	/* Bank 0 */
#define FANIN_CTRL0_REG		0x24
#define FANIN_CTRL1_REG		0x25
#define DTS_T_CTRL0_REG		0x26
#define DTS_T_CTRL1_REG		0x27
#define VT_ADC_MD_REG		0x2E

#define VSEN1_HV_REG		0x40	/* Bank 0; 2 regs (HV/LV) per sensor */
#define TEMP_CH1_HV_REG		0x42	/* Bank 0; same as VSEN2_HV */
#define LTD_HV_REG		0x62	/* Bank 0; 2 regs in VSEN range */
#define FANIN1_HV_REG		0x80	/* Bank 0; 2 regs (HV/LV) per sensor */
#define T_CPU1_HV_REG		0xA0	/* Bank 0; 2 regs (HV/LV) per sensor */

#define PRTS_REG		0x03	/* Bank 2 */
#define FANCTL1_FMR_REG		0x00	/* Bank 3; 1 reg per channel */
#define FANCTL1_OUT_REG		0x10	/* Bank 3; 1 reg per channel */

static const unsigned short normal_i2c[] = {
	0x2d, 0x2e, I2C_CLIENT_END
};

struct nct7904_data {
	struct i2c_client *client;
	struct mutex bank_lock;
	int bank_sel;
	u32 fanin_mask;
	u32 vsen_mask;
	u32 tcpu_mask;
	u8 fan_mode[FANCTL_MAX];
};

/* Access functions */
static int nct7904_bank_lock(struct nct7904_data *data, unsigned int bank)
{
	int ret;

	mutex_lock(&data->bank_lock);
	if (data->bank_sel == bank)
		return 0;
	ret = i2c_smbus_write_byte_data(data->client, BANK_SEL_REG, bank);
	if (ret == 0)
		data->bank_sel = bank;
	else
		data->bank_sel = -1;
	return ret;
}

static inline void nct7904_bank_release(struct nct7904_data *data)
{
	mutex_unlock(&data->bank_lock);
}

/* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
static int nct7904_read_reg(struct nct7904_data *data,
			    unsigned int bank, unsigned int reg)
{
	struct i2c_client *client = data->client;
	int ret;

	ret = nct7904_bank_lock(data, bank);
	if (ret == 0)
		ret = i2c_smbus_read_byte_data(client, reg);

	nct7904_bank_release(data);
	return ret;
}

/*
 * Read 2-byte register. Returns register in big-endian format or
 * -ERRNO on error.
 */
static int nct7904_read_reg16(struct nct7904_data *data,
			      unsigned int bank, unsigned int reg)
{
	struct i2c_client *client = data->client;
	int ret, hi;

	ret = nct7904_bank_lock(data, bank);
	if (ret == 0) {
		ret = i2c_smbus_read_byte_data(client, reg);
		if (ret >= 0) {
			hi = ret;
			ret = i2c_smbus_read_byte_data(client, reg + 1);
			if (ret >= 0)
				ret |= hi << 8;
		}
	}

	nct7904_bank_release(data);
	return ret;
}

/* Write 1-byte register. Returns 0 or -ERRNO on error. */
static int nct7904_write_reg(struct nct7904_data *data,
			     unsigned int bank, unsigned int reg, u8 val)
{
	struct i2c_client *client = data->client;
	int ret;

	ret = nct7904_bank_lock(data, bank);
	if (ret == 0)
		ret = i2c_smbus_write_byte_data(client, reg, val);

	nct7904_bank_release(data);
	return ret;
}

static int nct7904_read_fan(struct device *dev, u32 attr, int channel,
			    long *val)
{
	struct nct7904_data *data = dev_get_drvdata(dev);
	unsigned int cnt, rpm;
	int ret;

	switch (attr) {
	case hwmon_fan_input:
		ret = nct7904_read_reg16(data, BANK_0,
					 FANIN1_HV_REG + channel * 2);
		if (ret < 0)
			return ret;
		cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
		if (cnt == 0x1fff)
			rpm = 0;
		else
			rpm = 1350000 / cnt;
		*val = rpm;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t nct7904_fan_is_visible(const void *_data, u32 attr, int channel)
{
	const struct nct7904_data *data = _data;

	if (attr == hwmon_fan_input && data->fanin_mask & (1 << channel))
		return 0444;
	return 0;
}

static u8 nct7904_chan_to_index[] = {
	0,	/* Not used */
	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
	18, 19, 20, 16
};

static int nct7904_read_in(struct device *dev, u32 attr, int channel,
			   long *val)
{
	struct nct7904_data *data = dev_get_drvdata(dev);
	int ret, volt, index;

	index = nct7904_chan_to_index[channel];

	switch (attr) {
	case hwmon_in_input:
		ret = nct7904_read_reg16(data, BANK_0,
					 VSEN1_HV_REG + index * 2);
		if (ret < 0)
			return ret;
		volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
		if (index < 14)
			volt *= 2; /* 0.002V scale */
		else
			volt *= 6; /* 0.006V scale */
		*val = volt;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t nct7904_in_is_visible(const void *_data, u32 attr, int channel)
{
	const struct nct7904_data *data = _data;
	int index = nct7904_chan_to_index[channel];

	if (channel > 0 && attr == hwmon_in_input &&
	    (data->vsen_mask & BIT(index)))
		return 0444;

	return 0;
}

static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
			     long *val)
{
	struct nct7904_data *data = dev_get_drvdata(dev);
	int ret, temp;

	switch (attr) {
	case hwmon_temp_input:
		if (channel == 0)
			ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
		else
			ret = nct7904_read_reg16(data, BANK_0,
					T_CPU1_HV_REG + (channel - 1) * 2);
		if (ret < 0)
			return ret;
		temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
		*val = sign_extend32(temp, 10) * 125;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t nct7904_temp_is_visible(const void *_data, u32 attr, int channel)
{
	const struct nct7904_data *data = _data;

	if (attr == hwmon_temp_input) {
		if (channel == 0) {
			if (data->vsen_mask & BIT(17))
				return 0444;
		} else {
			if (data->tcpu_mask & BIT(channel - 1))
				return 0444;
		}
	}

	return 0;
}

static int nct7904_read_pwm(struct device *dev, u32 attr, int channel,
			    long *val)
{
	struct nct7904_data *data = dev_get_drvdata(dev);
	int ret;

	switch (attr) {
	case hwmon_pwm_input:
		ret = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + channel);
		if (ret < 0)
			return ret;
		*val = ret;
		return 0;
	case hwmon_pwm_enable:
		ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + channel);
		if (ret < 0)
			return ret;

		*val = ret ? 2 : 1;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int nct7904_write_pwm(struct device *dev, u32 attr, int channel,
			     long val)
{
	struct nct7904_data *data = dev_get_drvdata(dev);
	int ret;

	switch (attr) {
	case hwmon_pwm_input:
		if (val < 0 || val > 255)
			return -EINVAL;
		ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + channel,
					val);
		return ret;
	case hwmon_pwm_enable:
		if (val < 1 || val > 2 ||
		    (val == 2 && !data->fan_mode[channel]))
			return -EINVAL;
		ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + channel,
					val == 2 ? data->fan_mode[channel] : 0);
		return ret;
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t nct7904_pwm_is_visible(const void *_data, u32 attr, int channel)
{
	switch (attr) {
	case hwmon_pwm_input:
	case hwmon_pwm_enable:
		return 0644;
	default:
		return 0;
	}
}

static int nct7904_read(struct device *dev, enum hwmon_sensor_types type,
			u32 attr, int channel, long *val)
{
	switch (type) {
	case hwmon_in:
		return nct7904_read_in(dev, attr, channel, val);
	case hwmon_fan:
		return nct7904_read_fan(dev, attr, channel, val);
	case hwmon_pwm:
		return nct7904_read_pwm(dev, attr, channel, val);
	case hwmon_temp:
		return nct7904_read_temp(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static int nct7904_write(struct device *dev, enum hwmon_sensor_types type,
			 u32 attr, int channel, long val)
{
	switch (type) {
	case hwmon_pwm:
		return nct7904_write_pwm(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t nct7904_is_visible(const void *data,
				  enum hwmon_sensor_types type,
				  u32 attr, int channel)
{
	switch (type) {
	case hwmon_in:
		return nct7904_in_is_visible(data, attr, channel);
	case hwmon_fan:
		return nct7904_fan_is_visible(data, attr, channel);
	case hwmon_pwm:
		return nct7904_pwm_is_visible(data, attr, channel);
	case hwmon_temp:
		return nct7904_temp_is_visible(data, attr, channel);
	default:
		return 0;
	}
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int nct7904_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;

	if (!i2c_check_functionality(adapter,
				     I2C_FUNC_SMBUS_READ_BYTE |
				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
		return -ENODEV;

	/* Determine the chip type. */
	if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID ||
	    i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID ||
	    (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 ||
	    (i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00)
		return -ENODEV;

	strlcpy(info->type, "nct7904", I2C_NAME_SIZE);

	return 0;
}

static const struct hwmon_channel_info *nct7904_info[] = {
	HWMON_CHANNEL_INFO(in,
			   HWMON_I_INPUT, /* dummy, skipped in is_visible */
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT,
			   HWMON_I_INPUT),
	HWMON_CHANNEL_INFO(fan,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT,
			   HWMON_F_INPUT),
	HWMON_CHANNEL_INFO(pwm,
			   HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
			   HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
			   HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
			   HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
	HWMON_CHANNEL_INFO(temp,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT,
			   HWMON_T_INPUT),
	NULL
};

static const struct hwmon_ops nct7904_hwmon_ops = {
	.is_visible = nct7904_is_visible,
	.read = nct7904_read,
	.write = nct7904_write,
};

static const struct hwmon_chip_info nct7904_chip_info = {
	.ops = &nct7904_hwmon_ops,
	.info = nct7904_info,
};

static int nct7904_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct nct7904_data *data;
	struct device *hwmon_dev;
	struct device *dev = &client->dev;
	int ret, i;
	u32 mask;

	data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	mutex_init(&data->bank_lock);
	data->bank_sel = -1;

	/* Setup sensor groups. */
	/* FANIN attributes */
	ret = nct7904_read_reg16(data, BANK_0, FANIN_CTRL0_REG);
	if (ret < 0)
		return ret;
	data->fanin_mask = (ret >> 8) | ((ret & 0xff) << 8);

	/*
	 * VSEN attributes
	 *
	 * Note: voltage sensors overlap with external temperature
	 * sensors. So, if we ever decide to support the latter
	 * we will have to adjust 'vsen_mask' accordingly.
	 */
	mask = 0;
	ret = nct7904_read_reg16(data, BANK_0, VT_ADC_CTRL0_REG);
	if (ret >= 0)
		mask = (ret >> 8) | ((ret & 0xff) << 8);
	ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
	if (ret >= 0)
		mask |= (ret << 16);
	data->vsen_mask = mask;

	/* CPU_TEMP attributes */
	ret = nct7904_read_reg16(data, BANK_0, DTS_T_CTRL0_REG);
	if (ret < 0)
		return ret;
	data->tcpu_mask = ((ret >> 8) & 0xf) | ((ret & 0xf) << 4);

	for (i = 0; i < FANCTL_MAX; i++) {
		ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i);
		if (ret < 0)
			return ret;
		data->fan_mode[i] = ret;
	}

	hwmon_dev =
		devm_hwmon_device_register_with_info(dev, client->name, data,
						     &nct7904_chip_info, NULL);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id nct7904_id[] = {
	{"nct7904", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, nct7904_id);

static struct i2c_driver nct7904_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		.name = "nct7904",
	},
	.probe = nct7904_probe,
	.id_table = nct7904_id,
	.detect = nct7904_detect,
	.address_list = normal_i2c,
};

module_i2c_driver(nct7904_driver);

MODULE_AUTHOR("Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>");
MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
MODULE_LICENSE("GPL");