summaryrefslogtreecommitdiff
path: root/drivers/iio/adc/rtq6056.c
blob: ad4cea6839b271de330829e5bdfc1c3d86db7e6f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2022 Richtek Technology Corp.
 *
 * ChiYuan Huang <cy_huang@richtek.com>
 */

#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/util_macros.h>

#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

#define RTQ6056_REG_CONFIG	0x00
#define RTQ6056_REG_SHUNTVOLT	0x01
#define RTQ6056_REG_BUSVOLT	0x02
#define RTQ6056_REG_POWER	0x03
#define RTQ6056_REG_CURRENT	0x04
#define RTQ6056_REG_CALIBRATION	0x05
#define RTQ6056_REG_MASKENABLE	0x06
#define RTQ6056_REG_ALERTLIMIT	0x07
#define RTQ6056_REG_MANUFACTID	0xFE
#define RTQ6056_REG_DIEID	0xFF

#define RTQ6056_VENDOR_ID	0x1214
#define RTQ6056_DEFAULT_CONFIG	0x4127
#define RTQ6056_CONT_ALLON	7

enum {
	RTQ6056_CH_VSHUNT = 0,
	RTQ6056_CH_VBUS,
	RTQ6056_CH_POWER,
	RTQ6056_CH_CURRENT,
	RTQ6056_MAX_CHANNEL
};

enum {
	F_OPMODE = 0,
	F_VSHUNTCT,
	F_VBUSCT,
	F_AVG,
	F_RESET,
	F_MAX_FIELDS
};

struct rtq6056_priv {
	struct device *dev;
	struct regmap *regmap;
	struct regmap_field *rm_fields[F_MAX_FIELDS];
	u32 shunt_resistor_uohm;
	int vshuntct_us;
	int vbusct_us;
	int avg_sample;
};

static const struct reg_field rtq6056_reg_fields[F_MAX_FIELDS] = {
	[F_OPMODE] = REG_FIELD(RTQ6056_REG_CONFIG, 0, 2),
	[F_VSHUNTCT] = REG_FIELD(RTQ6056_REG_CONFIG, 3, 5),
	[F_VBUSCT] = REG_FIELD(RTQ6056_REG_CONFIG, 6, 8),
	[F_AVG]	= REG_FIELD(RTQ6056_REG_CONFIG, 9, 11),
	[F_RESET] = REG_FIELD(RTQ6056_REG_CONFIG, 15, 15),
};

static const struct iio_chan_spec rtq6056_channels[RTQ6056_MAX_CHANNEL + 1] = {
	{
		.type = IIO_VOLTAGE,
		.indexed = 1,
		.channel = 0,
		.address = RTQ6056_REG_SHUNTVOLT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SCALE) |
				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.scan_index = 0,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_CPU,
		},
	},
	{
		.type = IIO_VOLTAGE,
		.indexed = 1,
		.channel = 1,
		.address = RTQ6056_REG_BUSVOLT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SCALE) |
				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.scan_index = 1,
		.scan_type = {
			.sign = 'u',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_CPU,
		},
	},
	{
		.type = IIO_POWER,
		.indexed = 1,
		.channel = 2,
		.address = RTQ6056_REG_POWER,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SCALE) |
				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.scan_index = 2,
		.scan_type = {
			.sign = 'u',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_CPU,
		},
	},
	{
		.type = IIO_CURRENT,
		.indexed = 1,
		.channel = 3,
		.address = RTQ6056_REG_CURRENT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
		.scan_index = 3,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_CPU,
		},
	},
	IIO_CHAN_SOFT_TIMESTAMP(RTQ6056_MAX_CHANNEL),
};

static int rtq6056_adc_read_channel(struct rtq6056_priv *priv,
				    struct iio_chan_spec const *ch,
				    int *val)
{
	struct device *dev = priv->dev;
	unsigned int addr = ch->address;
	unsigned int regval;
	int ret;

	pm_runtime_get_sync(dev);
	ret = regmap_read(priv->regmap, addr, &regval);
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put(dev);
	if (ret)
		return ret;

	/* Power and VBUS is unsigned 16-bit, others are signed 16-bit */
	if (addr == RTQ6056_REG_BUSVOLT || addr == RTQ6056_REG_POWER)
		*val = regval;
	else
		*val = sign_extend32(regval, 16);

	return IIO_VAL_INT;
}

static int rtq6056_adc_read_scale(struct iio_chan_spec const *ch, int *val,
				  int *val2)
{
	switch (ch->address) {
	case RTQ6056_REG_SHUNTVOLT:
		/* VSHUNT lsb  2.5uV */
		*val = 2500;
		*val2 = 1000000;
		return IIO_VAL_FRACTIONAL;
	case RTQ6056_REG_BUSVOLT:
		/* VBUS lsb 1.25mV */
		*val = 1250;
		*val2 = 1000;
		return IIO_VAL_FRACTIONAL;
	case RTQ6056_REG_POWER:
		/* Power lsb 25mW */
		*val = 25;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}
}

/*
 * Sample frequency for channel VSHUNT and VBUS. The indices correspond
 * with the bit value expected by the chip. And it can be found at
 * https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
 */
static const int rtq6056_samp_freq_list[] = {
	7194, 4926, 3717, 1904, 964, 485, 243, 122,
};

static int rtq6056_adc_set_samp_freq(struct rtq6056_priv *priv,
				     struct iio_chan_spec const *ch, int val)
{
	struct regmap_field *rm_field;
	unsigned int selector;
	int *ct, ret;

	if (val > 7194 || val < 122)
		return -EINVAL;

	if (ch->address == RTQ6056_REG_SHUNTVOLT) {
		rm_field = priv->rm_fields[F_VSHUNTCT];
		ct = &priv->vshuntct_us;
	} else if (ch->address == RTQ6056_REG_BUSVOLT) {
		rm_field = priv->rm_fields[F_VBUSCT];
		ct = &priv->vbusct_us;
	} else
		return -EINVAL;

	selector = find_closest_descending(val, rtq6056_samp_freq_list,
					   ARRAY_SIZE(rtq6056_samp_freq_list));

	ret = regmap_field_write(rm_field, selector);
	if (ret)
		return ret;

	*ct = 1000000 / rtq6056_samp_freq_list[selector];

	return 0;
}

/*
 * Available averaging rate for rtq6056. The indices correspond with the bit
 * value expected by the chip. And it can be found at
 * https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
 */
static const int rtq6056_avg_sample_list[] = {
	1, 4, 16, 64, 128, 256, 512, 1024,
};

static int rtq6056_adc_set_average(struct rtq6056_priv *priv, int val)
{
	unsigned int selector;
	int ret;

	if (val > 1024 || val < 1)
		return -EINVAL;

	selector = find_closest(val, rtq6056_avg_sample_list,
				ARRAY_SIZE(rtq6056_avg_sample_list));

	ret = regmap_field_write(priv->rm_fields[F_AVG], selector);
	if (ret)
		return ret;

	priv->avg_sample = rtq6056_avg_sample_list[selector];

	return 0;
}

static int rtq6056_adc_get_sample_freq(struct rtq6056_priv *priv,
				       struct iio_chan_spec const *ch, int *val)
{
	int sample_time;

	if (ch->address == RTQ6056_REG_SHUNTVOLT)
		sample_time = priv->vshuntct_us;
	else if (ch->address == RTQ6056_REG_BUSVOLT)
		sample_time = priv->vbusct_us;
	else {
		sample_time = priv->vshuntct_us + priv->vbusct_us;
		sample_time *= priv->avg_sample;
	}

	*val = 1000000 / sample_time;

	return IIO_VAL_INT;
}

static int rtq6056_adc_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan, int *val,
				int *val2, long mask)
{
	struct rtq6056_priv *priv = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		return rtq6056_adc_read_channel(priv, chan, val);
	case IIO_CHAN_INFO_SCALE:
		return rtq6056_adc_read_scale(chan, val, val2);
	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
		*val = priv->avg_sample;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SAMP_FREQ:
		return rtq6056_adc_get_sample_freq(priv, chan, val);
	default:
		return -EINVAL;
	}
}

static int rtq6056_adc_read_avail(struct iio_dev *indio_dev,
				  struct iio_chan_spec const *chan,
				  const int **vals, int *type, int *length,
				  long mask)
{
	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		*vals = rtq6056_samp_freq_list;
		*type = IIO_VAL_INT;
		*length = ARRAY_SIZE(rtq6056_samp_freq_list);
		return IIO_AVAIL_LIST;
	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
		*vals = rtq6056_avg_sample_list;
		*type = IIO_VAL_INT;
		*length = ARRAY_SIZE(rtq6056_avg_sample_list);
		return IIO_AVAIL_LIST;
	default:
		return -EINVAL;
	}
}

static int rtq6056_adc_write_raw(struct iio_dev *indio_dev,
				 struct iio_chan_spec const *chan, int val,
				 int val2, long mask)
{
	struct rtq6056_priv *priv = iio_priv(indio_dev);
	int ret;

	ret = iio_device_claim_direct_mode(indio_dev);
	if (ret)
		return ret;

	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret = rtq6056_adc_set_samp_freq(priv, chan, val);
		break;
	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
		ret = rtq6056_adc_set_average(priv, val);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	iio_device_release_direct_mode(indio_dev);

	return ret;
}

static const char *rtq6056_channel_labels[RTQ6056_MAX_CHANNEL] = {
	[RTQ6056_CH_VSHUNT] = "Vshunt",
	[RTQ6056_CH_VBUS] = "Vbus",
	[RTQ6056_CH_POWER] = "Power",
	[RTQ6056_CH_CURRENT] = "Current",
};

static int rtq6056_adc_read_label(struct iio_dev *indio_dev,
				  struct iio_chan_spec const *chan,
				  char *label)
{
	return sysfs_emit(label, "%s\n", rtq6056_channel_labels[chan->channel]);
}

static int rtq6056_set_shunt_resistor(struct rtq6056_priv *priv,
				      int resistor_uohm)
{
	unsigned int calib_val;
	int ret;

	if (resistor_uohm <= 0) {
		dev_err(priv->dev, "Invalid resistor [%d]\n", resistor_uohm);
		return -EINVAL;
	}

	/* calibration = 5120000 / (Rshunt (uOhm) * current lsb (1mA)) */
	calib_val = 5120000 / resistor_uohm;
	ret = regmap_write(priv->regmap, RTQ6056_REG_CALIBRATION, calib_val);
	if (ret)
		return ret;

	priv->shunt_resistor_uohm = resistor_uohm;

	return 0;
}

static ssize_t shunt_resistor_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct rtq6056_priv *priv = iio_priv(dev_to_iio_dev(dev));
	int vals[2] = { priv->shunt_resistor_uohm, 1000000 };

	return iio_format_value(buf, IIO_VAL_FRACTIONAL, 1, vals);
}

static ssize_t shunt_resistor_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct rtq6056_priv *priv = iio_priv(indio_dev);
	int val, val_fract, ret;

	ret = iio_device_claim_direct_mode(indio_dev);
	if (ret)
		return ret;

	ret = iio_str_to_fixpoint(buf, 100000, &val, &val_fract);
	if (ret)
		goto out_store;

	ret = rtq6056_set_shunt_resistor(priv, val * 1000000 + val_fract);

out_store:
	iio_device_release_direct_mode(indio_dev);

	return ret ?: len;
}

static IIO_DEVICE_ATTR_RW(shunt_resistor, 0);

static struct attribute *rtq6056_attributes[] = {
	&iio_dev_attr_shunt_resistor.dev_attr.attr,
	NULL
};

static const struct attribute_group rtq6056_attribute_group = {
	.attrs = rtq6056_attributes,
};

static const struct iio_info rtq6056_info = {
	.attrs = &rtq6056_attribute_group,
	.read_raw = rtq6056_adc_read_raw,
	.read_avail = rtq6056_adc_read_avail,
	.write_raw = rtq6056_adc_write_raw,
	.read_label = rtq6056_adc_read_label,
};

static irqreturn_t rtq6056_buffer_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct rtq6056_priv *priv = iio_priv(indio_dev);
	struct device *dev = priv->dev;
	struct {
		u16 vals[RTQ6056_MAX_CHANNEL];
		s64 timestamp __aligned(8);
	} data;
	unsigned int raw;
	int i = 0, bit, ret;

	memset(&data, 0, sizeof(data));

	pm_runtime_get_sync(dev);

	for_each_set_bit(bit, indio_dev->active_scan_mask, indio_dev->masklength) {
		unsigned int addr = rtq6056_channels[bit].address;

		ret = regmap_read(priv->regmap, addr, &raw);
		if (ret)
			goto out;

		data.vals[i++] = raw;
	}

	iio_push_to_buffers_with_timestamp(indio_dev, &data, iio_get_time_ns(indio_dev));

out:
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put(dev);

	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static void rtq6056_enter_shutdown_state(void *dev)
{
	struct rtq6056_priv *priv = dev_get_drvdata(dev);

	/* Enter shutdown state */
	regmap_field_write(priv->rm_fields[F_OPMODE], 0);
}

static bool rtq6056_is_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case RTQ6056_REG_CONFIG ... RTQ6056_REG_ALERTLIMIT:
	case RTQ6056_REG_MANUFACTID ... RTQ6056_REG_DIEID:
		return true;
	default:
		return false;
	}
}

static bool rtq6056_is_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case RTQ6056_REG_CONFIG:
	case RTQ6056_REG_CALIBRATION ... RTQ6056_REG_ALERTLIMIT:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config rtq6056_regmap_config = {
	.reg_bits = 8,
	.val_bits = 16,
	.val_format_endian = REGMAP_ENDIAN_BIG,
	.max_register = RTQ6056_REG_DIEID,
	.readable_reg = rtq6056_is_readable_reg,
	.writeable_reg = rtq6056_is_writeable_reg,
};

static int rtq6056_probe(struct i2c_client *i2c)
{
	struct iio_dev *indio_dev;
	struct rtq6056_priv *priv;
	struct device *dev = &i2c->dev;
	struct regmap *regmap;
	unsigned int vendor_id, shunt_resistor_uohm;
	int ret;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_WORD_DATA))
		return -EOPNOTSUPP;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
	if (!indio_dev)
		return -ENOMEM;

	priv = iio_priv(indio_dev);
	priv->dev = dev;
	priv->vshuntct_us = priv->vbusct_us = 1037;
	priv->avg_sample = 1;
	i2c_set_clientdata(i2c, priv);

	regmap = devm_regmap_init_i2c(i2c, &rtq6056_regmap_config);
	if (IS_ERR(regmap))
		return dev_err_probe(dev, PTR_ERR(regmap),
				     "Failed to init regmap\n");

	priv->regmap = regmap;

	ret = regmap_read(regmap, RTQ6056_REG_MANUFACTID, &vendor_id);
	if (ret)
		return dev_err_probe(dev, ret,
				     "Failed to get manufacturer info\n");

	if (vendor_id != RTQ6056_VENDOR_ID)
		return dev_err_probe(dev, -ENODEV,
				     "Invalid vendor id 0x%04x\n", vendor_id);

	ret = devm_regmap_field_bulk_alloc(dev, regmap, priv->rm_fields,
					   rtq6056_reg_fields, F_MAX_FIELDS);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to init regmap field\n");

	/*
	 * By default, configure average sample as 1, bus and shunt conversion
	 * time as 1037 microsecond, and operating mode to all on.
	 */
	ret = regmap_write(regmap, RTQ6056_REG_CONFIG, RTQ6056_DEFAULT_CONFIG);
	if (ret)
		return dev_err_probe(dev, ret,
				     "Failed to enable continuous sensing\n");

	ret = devm_add_action_or_reset(dev, rtq6056_enter_shutdown_state, dev);
	if (ret)
		return ret;

	pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_active(dev);
	pm_runtime_mark_last_busy(dev);
	ret = devm_pm_runtime_enable(dev);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to enable pm_runtime\n");

	/* By default, use 2000 micro-Ohm resistor */
	shunt_resistor_uohm = 2000;
	device_property_read_u32(dev, "shunt-resistor-micro-ohms",
				 &shunt_resistor_uohm);

	ret = rtq6056_set_shunt_resistor(priv, shunt_resistor_uohm);
	if (ret)
		return dev_err_probe(dev, ret,
				     "Failed to init shunt resistor\n");

	indio_dev->name = "rtq6056";
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = rtq6056_channels;
	indio_dev->num_channels = ARRAY_SIZE(rtq6056_channels);
	indio_dev->info = &rtq6056_info;

	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
					      rtq6056_buffer_trigger_handler,
					      NULL);
	if (ret)
		return dev_err_probe(dev, ret,
				     "Failed to allocate iio trigger buffer\n");

	return devm_iio_device_register(dev, indio_dev);
}

static int rtq6056_runtime_suspend(struct device *dev)
{
	struct rtq6056_priv *priv = dev_get_drvdata(dev);

	/* Configure to shutdown mode */
	return regmap_field_write(priv->rm_fields[F_OPMODE], 0);
}

static int rtq6056_runtime_resume(struct device *dev)
{
	struct rtq6056_priv *priv = dev_get_drvdata(dev);
	int sample_rdy_time_us, ret;

	ret = regmap_field_write(priv->rm_fields[F_OPMODE], RTQ6056_CONT_ALLON);
	if (ret)
		return ret;

	sample_rdy_time_us = priv->vbusct_us + priv->vshuntct_us;
	sample_rdy_time_us *= priv->avg_sample;

	usleep_range(sample_rdy_time_us, sample_rdy_time_us + 100);

	return 0;
}

static DEFINE_RUNTIME_DEV_PM_OPS(rtq6056_pm_ops, rtq6056_runtime_suspend,
				 rtq6056_runtime_resume, NULL);

static const struct of_device_id rtq6056_device_match[] = {
	{ .compatible = "richtek,rtq6056" },
	{}
};
MODULE_DEVICE_TABLE(of, rtq6056_device_match);

static struct i2c_driver rtq6056_driver = {
	.driver = {
		.name = "rtq6056",
		.of_match_table = rtq6056_device_match,
		.pm = pm_ptr(&rtq6056_pm_ops),
	},
	.probe = rtq6056_probe,
};
module_i2c_driver(rtq6056_driver);

MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RTQ6056 Driver");
MODULE_LICENSE("GPL v2");