summaryrefslogtreecommitdiff
path: root/drivers/hwmon/pmbus/lm25066.c
blob: 9e4cf0800186a23af5b9604326896664db10fc0d (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for LM25056 / LM25066 / LM5064 / LM5066
 *
 * Copyright (c) 2011 Ericsson AB.
 * Copyright (c) 2013 Guenter Roeck
 */

#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/log2.h>
#include "pmbus.h"

enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };

#define LM25066_READ_VAUX		0xd0
#define LM25066_MFR_READ_IIN		0xd1
#define LM25066_MFR_READ_PIN		0xd2
#define LM25066_MFR_IIN_OC_WARN_LIMIT	0xd3
#define LM25066_MFR_PIN_OP_WARN_LIMIT	0xd4
#define LM25066_READ_PIN_PEAK		0xd5
#define LM25066_CLEAR_PIN_PEAK		0xd6
#define LM25066_DEVICE_SETUP		0xd9
#define LM25066_READ_AVG_VIN		0xdc
#define LM25066_SAMPLES_FOR_AVG		0xdb
#define LM25066_READ_AVG_VOUT		0xdd
#define LM25066_READ_AVG_IIN		0xde
#define LM25066_READ_AVG_PIN		0xdf

#define LM25066_DEV_SETUP_CL		BIT(4)	/* Current limit */

#define LM25066_SAMPLES_FOR_AVG_MAX	4096

/* LM25056 only */

#define LM25056_VAUX_OV_WARN_LIMIT	0xe3
#define LM25056_VAUX_UV_WARN_LIMIT	0xe4

#define LM25056_MFR_STS_VAUX_OV_WARN	BIT(1)
#define LM25056_MFR_STS_VAUX_UV_WARN	BIT(0)

struct __coeff {
	short m, b, R;
};

#define PSC_CURRENT_IN_L	(PSC_NUM_CLASSES)
#define PSC_POWER_L		(PSC_NUM_CLASSES + 1)

static struct __coeff lm25066_coeff[6][PSC_NUM_CLASSES + 2] = {
	[lm25056] = {
		[PSC_VOLTAGE_IN] = {
			.m = 16296,
			.R = -2,
		},
		[PSC_CURRENT_IN] = {
			.m = 13797,
			.R = -2,
		},
		[PSC_CURRENT_IN_L] = {
			.m = 6726,
			.R = -2,
		},
		[PSC_POWER] = {
			.m = 5501,
			.R = -3,
		},
		[PSC_POWER_L] = {
			.m = 26882,
			.R = -4,
		},
		[PSC_TEMPERATURE] = {
			.m = 1580,
			.b = -14500,
			.R = -2,
		},
	},
	[lm25066] = {
		[PSC_VOLTAGE_IN] = {
			.m = 22070,
			.R = -2,
		},
		[PSC_VOLTAGE_OUT] = {
			.m = 22070,
			.R = -2,
		},
		[PSC_CURRENT_IN] = {
			.m = 13661,
			.R = -2,
		},
		[PSC_CURRENT_IN_L] = {
			.m = 6852,
			.R = -2,
		},
		[PSC_POWER] = {
			.m = 736,
			.R = -2,
		},
		[PSC_POWER_L] = {
			.m = 369,
			.R = -2,
		},
		[PSC_TEMPERATURE] = {
			.m = 16,
		},
	},
	[lm5064] = {
		[PSC_VOLTAGE_IN] = {
			.m = 4611,
			.R = -2,
		},
		[PSC_VOLTAGE_OUT] = {
			.m = 4621,
			.R = -2,
		},
		[PSC_CURRENT_IN] = {
			.m = 10742,
			.R = -2,
		},
		[PSC_CURRENT_IN_L] = {
			.m = 5456,
			.R = -2,
		},
		[PSC_POWER] = {
			.m = 1204,
			.R = -3,
		},
		[PSC_POWER_L] = {
			.m = 612,
			.R = -3,
		},
		[PSC_TEMPERATURE] = {
			.m = 16,
		},
	},
	[lm5066] = {
		[PSC_VOLTAGE_IN] = {
			.m = 4587,
			.R = -2,
		},
		[PSC_VOLTAGE_OUT] = {
			.m = 4587,
			.R = -2,
		},
		[PSC_CURRENT_IN] = {
			.m = 10753,
			.R = -2,
		},
		[PSC_CURRENT_IN_L] = {
			.m = 5405,
			.R = -2,
		},
		[PSC_POWER] = {
			.m = 1204,
			.R = -3,
		},
		[PSC_POWER_L] = {
			.m = 605,
			.R = -3,
		},
		[PSC_TEMPERATURE] = {
			.m = 16,
		},
	},
	[lm5066i] = {
		[PSC_VOLTAGE_IN] = {
			.m = 4617,
			.b = -140,
			.R = -2,
		},
		[PSC_VOLTAGE_OUT] = {
			.m = 4602,
			.b = 500,
			.R = -2,
		},
		[PSC_CURRENT_IN] = {
			.m = 15076,
			.b = -504,
			.R = -2,
		},
		[PSC_CURRENT_IN_L] = {
			.m = 7645,
			.b = 100,
			.R = -2,
		},
		[PSC_POWER] = {
			.m = 1701,
			.b = -4000,
			.R = -3,
		},
		[PSC_POWER_L] = {
			.m = 861,
			.b = -965,
			.R = -3,
		},
		[PSC_TEMPERATURE] = {
			.m = 16,
		},
	},
};

struct lm25066_data {
	int id;
	u16 rlimit;			/* Maximum register value */
	struct pmbus_driver_info info;
};

#define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)

static int lm25066_read_word_data(struct i2c_client *client, int page,
				  int phase, int reg)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct lm25066_data *data = to_lm25066_data(info);
	int ret;

	switch (reg) {
	case PMBUS_VIRT_READ_VMON:
		ret = pmbus_read_word_data(client, 0, 0xff, LM25066_READ_VAUX);
		if (ret < 0)
			break;
		/* Adjust returned value to match VIN coefficients */
		switch (data->id) {
		case lm25056:
			/* VIN: 6.14 mV VAUX: 293 uV LSB */
			ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
			break;
		case lm25066:
			/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
			ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
			break;
		case lm5064:
			/* VIN: 4.53 mV VAUX: 700 uV LSB */
			ret = DIV_ROUND_CLOSEST(ret * 70, 453);
			break;
		case lm5066:
		case lm5066i:
			/* VIN: 2.18 mV VAUX: 725 uV LSB */
			ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
			break;
		}
		break;
	case PMBUS_READ_IIN:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_MFR_READ_IIN);
		break;
	case PMBUS_READ_PIN:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_MFR_READ_PIN);
		break;
	case PMBUS_IIN_OC_WARN_LIMIT:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_MFR_IIN_OC_WARN_LIMIT);
		break;
	case PMBUS_PIN_OP_WARN_LIMIT:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_MFR_PIN_OP_WARN_LIMIT);
		break;
	case PMBUS_VIRT_READ_VIN_AVG:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_READ_AVG_VIN);
		break;
	case PMBUS_VIRT_READ_VOUT_AVG:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_READ_AVG_VOUT);
		break;
	case PMBUS_VIRT_READ_IIN_AVG:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_READ_AVG_IIN);
		break;
	case PMBUS_VIRT_READ_PIN_AVG:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_READ_AVG_PIN);
		break;
	case PMBUS_VIRT_READ_PIN_MAX:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25066_READ_PIN_PEAK);
		break;
	case PMBUS_VIRT_RESET_PIN_HISTORY:
		ret = 0;
		break;
	case PMBUS_VIRT_SAMPLES:
		ret = pmbus_read_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG);
		if (ret < 0)
			break;
		ret = 1 << ret;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int lm25056_read_word_data(struct i2c_client *client, int page,
				  int phase, int reg)
{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25056_VAUX_UV_WARN_LIMIT);
		if (ret < 0)
			break;
		/* Adjust returned value to match VIN coefficients */
		ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
		break;
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   LM25056_VAUX_OV_WARN_LIMIT);
		if (ret < 0)
			break;
		/* Adjust returned value to match VIN coefficients */
		ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
		break;
	default:
		ret = lm25066_read_word_data(client, page, phase, reg);
		break;
	}
	return ret;
}

static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
{
	int ret, s;

	switch (reg) {
	case PMBUS_VIRT_STATUS_VMON:
		ret = pmbus_read_byte_data(client, 0,
					   PMBUS_STATUS_MFR_SPECIFIC);
		if (ret < 0)
			break;
		s = 0;
		if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
			s |= PB_VOLTAGE_UV_WARNING;
		if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
			s |= PB_VOLTAGE_OV_WARNING;
		ret = s;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
				   u16 word)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct lm25066_data *data = to_lm25066_data(info);
	int ret;

	switch (reg) {
	case PMBUS_POUT_OP_FAULT_LIMIT:
	case PMBUS_POUT_OP_WARN_LIMIT:
	case PMBUS_VOUT_UV_WARN_LIMIT:
	case PMBUS_OT_FAULT_LIMIT:
	case PMBUS_OT_WARN_LIMIT:
	case PMBUS_IIN_OC_FAULT_LIMIT:
	case PMBUS_VIN_UV_WARN_LIMIT:
	case PMBUS_VIN_UV_FAULT_LIMIT:
	case PMBUS_VIN_OV_FAULT_LIMIT:
	case PMBUS_VIN_OV_WARN_LIMIT:
		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
		ret = pmbus_write_word_data(client, 0, reg, word);
		pmbus_clear_cache(client);
		break;
	case PMBUS_IIN_OC_WARN_LIMIT:
		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
		ret = pmbus_write_word_data(client, 0,
					    LM25066_MFR_IIN_OC_WARN_LIMIT,
					    word);
		pmbus_clear_cache(client);
		break;
	case PMBUS_PIN_OP_WARN_LIMIT:
		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
		ret = pmbus_write_word_data(client, 0,
					    LM25066_MFR_PIN_OP_WARN_LIMIT,
					    word);
		pmbus_clear_cache(client);
		break;
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
		/* Adjust from VIN coefficients (for LM25056) */
		word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
		ret = pmbus_write_word_data(client, 0,
					    LM25056_VAUX_UV_WARN_LIMIT, word);
		pmbus_clear_cache(client);
		break;
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
		/* Adjust from VIN coefficients (for LM25056) */
		word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
		word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
		ret = pmbus_write_word_data(client, 0,
					    LM25056_VAUX_OV_WARN_LIMIT, word);
		pmbus_clear_cache(client);
		break;
	case PMBUS_VIRT_RESET_PIN_HISTORY:
		ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
		break;
	case PMBUS_VIRT_SAMPLES:
		word = clamp_val(word, 1, LM25066_SAMPLES_FOR_AVG_MAX);
		ret = pmbus_write_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG,
					    ilog2(word));
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int lm25066_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	int config;
	struct lm25066_data *data;
	struct pmbus_driver_info *info;
	struct __coeff *coeff;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_READ_BYTE_DATA))
		return -ENODEV;

	data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
	if (config < 0)
		return config;

	data->id = id->driver_data;
	info = &data->info;

	info->pages = 1;
	info->format[PSC_VOLTAGE_IN] = direct;
	info->format[PSC_VOLTAGE_OUT] = direct;
	info->format[PSC_CURRENT_IN] = direct;
	info->format[PSC_TEMPERATURE] = direct;
	info->format[PSC_POWER] = direct;

	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
	  | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_SAMPLES;

	if (data->id == lm25056) {
		info->func[0] |= PMBUS_HAVE_STATUS_VMON;
		info->read_word_data = lm25056_read_word_data;
		info->read_byte_data = lm25056_read_byte_data;
		data->rlimit = 0x0fff;
	} else {
		info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
		info->read_word_data = lm25066_read_word_data;
		data->rlimit = 0x0fff;
	}
	info->write_word_data = lm25066_write_word_data;

	coeff = &lm25066_coeff[data->id][0];
	info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
	info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
	info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
	info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
	info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
	info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
	info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
	info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
	info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
	info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
	info->R[PSC_POWER] = coeff[PSC_POWER].R;
	if (config & LM25066_DEV_SETUP_CL) {
		info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
		info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].b;
		info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
		info->b[PSC_POWER] = coeff[PSC_POWER_L].b;
	} else {
		info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
		info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
		info->m[PSC_POWER] = coeff[PSC_POWER].m;
		info->b[PSC_POWER] = coeff[PSC_POWER].b;
	}

	return pmbus_do_probe(client, id, info);
}

static const struct i2c_device_id lm25066_id[] = {
	{"lm25056", lm25056},
	{"lm25066", lm25066},
	{"lm5064", lm5064},
	{"lm5066", lm5066},
	{"lm5066i", lm5066i},
	{ }
};

MODULE_DEVICE_TABLE(i2c, lm25066_id);

/* This is the driver that will be inserted */
static struct i2c_driver lm25066_driver = {
	.driver = {
		   .name = "lm25066",
		   },
	.probe = lm25066_probe,
	.remove = pmbus_do_remove,
	.id_table = lm25066_id,
};

module_i2c_driver(lm25066_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
MODULE_LICENSE("GPL");