summaryrefslogtreecommitdiffstats
path: root/drivers/iio/dac/ad5380.c
blob: 64b4519f8f5e6d52a5b2387f44a59b653e17064d (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392
 * multi-channel Digital to Analog Converters driver
 *
 * Copyright 2011 Analog Devices Inc.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define AD5380_REG_DATA(x)	(((x) << 2) | 3)
#define AD5380_REG_OFFSET(x)	(((x) << 2) | 2)
#define AD5380_REG_GAIN(x)	(((x) << 2) | 1)
#define AD5380_REG_SF_PWR_DOWN	(8 << 2)
#define AD5380_REG_SF_PWR_UP	(9 << 2)
#define AD5380_REG_SF_CTRL	(12 << 2)

#define AD5380_CTRL_PWR_DOWN_MODE_OFFSET	13
#define AD5380_CTRL_INT_VREF_2V5		BIT(12)
#define AD5380_CTRL_INT_VREF_EN			BIT(10)

/**
 * struct ad5380_chip_info - chip specific information
 * @channel_template:	channel specification template
 * @num_channels:	number of channels
 * @int_vref:		internal vref in uV
 */
struct ad5380_chip_info {
	struct iio_chan_spec	channel_template;
	unsigned int		num_channels;
	unsigned int		int_vref;
};

/**
 * struct ad5380_state - driver instance specific data
 * @regmap:		regmap instance used by the device
 * @chip_info:		chip model specific constants, available modes etc
 * @vref_reg:		vref supply regulator
 * @vref:		actual reference voltage used in uA
 * @pwr_down:		whether the chip is currently in power down mode
 * @lock:		lock to protect the data buffer during regmap ops
 */
struct ad5380_state {
	struct regmap			*regmap;
	const struct ad5380_chip_info	*chip_info;
	struct regulator		*vref_reg;
	int				vref;
	bool				pwr_down;
	struct mutex			lock;
};

enum ad5380_type {
	ID_AD5380_3,
	ID_AD5380_5,
	ID_AD5381_3,
	ID_AD5381_5,
	ID_AD5382_3,
	ID_AD5382_5,
	ID_AD5383_3,
	ID_AD5383_5,
	ID_AD5390_3,
	ID_AD5390_5,
	ID_AD5391_3,
	ID_AD5391_5,
	ID_AD5392_3,
	ID_AD5392_5,
};

static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
	struct ad5380_state *st = iio_priv(indio_dev);

	return sysfs_emit(buf, "%d\n", st->pwr_down);
}

static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev,
	 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
	 size_t len)
{
	struct ad5380_state *st = iio_priv(indio_dev);
	bool pwr_down;
	int ret;

	ret = kstrtobool(buf, &pwr_down);
	if (ret)
		return ret;

	mutex_lock(&st->lock);

	if (pwr_down)
		ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);
	else
		ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0);

	st->pwr_down = pwr_down;

	mutex_unlock(&st->lock);

	return ret ? ret : len;
}

static const char * const ad5380_powerdown_modes[] = {
	"100kohm_to_gnd",
	"three_state",
};

static int ad5380_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5380_state *st = iio_priv(indio_dev);
	unsigned int mode;
	int ret;

	ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);
	if (ret)
		return ret;

	mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;

	return mode;
}

static int ad5380_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5380_state *st = iio_priv(indio_dev);
	int ret;

	ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL,
		1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET,
		mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);

	return ret;
}

static const struct iio_enum ad5380_powerdown_mode_enum = {
	.items = ad5380_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5380_powerdown_modes),
	.get = ad5380_get_powerdown_mode,
	.set = ad5380_set_powerdown_mode,
};

static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,
	long info)
{
	switch (info) {
	case IIO_CHAN_INFO_RAW:
		return AD5380_REG_DATA(chan->address);
	case IIO_CHAN_INFO_CALIBBIAS:
		return AD5380_REG_OFFSET(chan->address);
	case IIO_CHAN_INFO_CALIBSCALE:
		return AD5380_REG_GAIN(chan->address);
	default:
		break;
	}

	return 0;
}

static int ad5380_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan, int val, int val2, long info)
{
	const unsigned int max_val = (1 << chan->scan_type.realbits);
	struct ad5380_state *st = iio_priv(indio_dev);

	switch (info) {
	case IIO_CHAN_INFO_RAW:
	case IIO_CHAN_INFO_CALIBSCALE:
		if (val >= max_val || val < 0)
			return -EINVAL;

		return regmap_write(st->regmap,
			ad5380_info_to_reg(chan, info),
			val << chan->scan_type.shift);
	case IIO_CHAN_INFO_CALIBBIAS:
		val += (1 << chan->scan_type.realbits) / 2;
		if (val >= max_val || val < 0)
			return -EINVAL;

		return regmap_write(st->regmap,
			AD5380_REG_OFFSET(chan->address),
			val << chan->scan_type.shift);
	default:
		break;
	}
	return -EINVAL;
}

static int ad5380_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan, int *val, int *val2, long info)
{
	struct ad5380_state *st = iio_priv(indio_dev);
	int ret;

	switch (info) {
	case IIO_CHAN_INFO_RAW:
	case IIO_CHAN_INFO_CALIBSCALE:
		ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),
					val);
		if (ret)
			return ret;
		*val >>= chan->scan_type.shift;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_CALIBBIAS:
		ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),
					val);
		if (ret)
			return ret;
		*val >>= chan->scan_type.shift;
		*val -= (1 << chan->scan_type.realbits) / 2;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 2 * st->vref;
		*val2 = chan->scan_type.realbits;
		return IIO_VAL_FRACTIONAL_LOG2;
	default:
		break;
	}

	return -EINVAL;
}

static const struct iio_info ad5380_info = {
	.read_raw = ad5380_read_raw,
	.write_raw = ad5380_write_raw,
};

static const struct iio_chan_spec_ext_info ad5380_ext_info[] = {
	{
		.name = "powerdown",
		.read = ad5380_read_dac_powerdown,
		.write = ad5380_write_dac_powerdown,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
		 &ad5380_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5380_powerdown_mode_enum),
	{ },
};

#define AD5380_CHANNEL(_bits) {					\
	.type = IIO_VOLTAGE,					\
	.indexed = 1,						\
	.output = 1,						\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
		BIT(IIO_CHAN_INFO_CALIBSCALE) |			\
		BIT(IIO_CHAN_INFO_CALIBBIAS),			\
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
	.scan_type = {						\
		.sign = 'u',					\
		.realbits = (_bits),				\
		.storagebits =  16,				\
		.shift = 14 - (_bits),				\
	},							\
	.ext_info = ad5380_ext_info,				\
}

static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {
	[ID_AD5380_3] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 40,
		.int_vref = 1250,
	},
	[ID_AD5380_5] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 40,
		.int_vref = 2500,
	},
	[ID_AD5381_3] = {
		.channel_template = AD5380_CHANNEL(12),
		.num_channels = 16,
		.int_vref = 1250,
	},
	[ID_AD5381_5] = {
		.channel_template = AD5380_CHANNEL(12),
		.num_channels = 16,
		.int_vref = 2500,
	},
	[ID_AD5382_3] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 32,
		.int_vref = 1250,
	},
	[ID_AD5382_5] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 32,
		.int_vref = 2500,
	},
	[ID_AD5383_3] = {
		.channel_template = AD5380_CHANNEL(12),
		.num_channels = 32,
		.int_vref = 1250,
	},
	[ID_AD5383_5] = {
		.channel_template = AD5380_CHANNEL(12),
		.num_channels = 32,
		.int_vref = 2500,
	},
	[ID_AD5390_3] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 16,
		.int_vref = 1250,
	},
	[ID_AD5390_5] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 16,
		.int_vref = 2500,
	},
	[ID_AD5391_3] = {
		.channel_template = AD5380_CHANNEL(12),
		.num_channels = 16,
		.int_vref = 1250,
	},
	[ID_AD5391_5] = {
		.channel_template = AD5380_CHANNEL(12),
		.num_channels = 16,
		.int_vref = 2500,
	},
	[ID_AD5392_3] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 8,
		.int_vref = 1250,
	},
	[ID_AD5392_5] = {
		.channel_template = AD5380_CHANNEL(14),
		.num_channels = 8,
		.int_vref = 2500,
	},
};

static int ad5380_alloc_channels(struct iio_dev *indio_dev)
{
	struct ad5380_state *st = iio_priv(indio_dev);
	struct iio_chan_spec *channels;
	unsigned int i;

	channels = kcalloc(st->chip_info->num_channels,
			   sizeof(struct iio_chan_spec), GFP_KERNEL);

	if (!channels)
		return -ENOMEM;

	for (i = 0; i < st->chip_info->num_channels; ++i) {
		channels[i] = st->chip_info->channel_template;
		channels[i].channel = i;
		channels[i].address = i;
	}

	indio_dev->channels = channels;

	return 0;
}

static int ad5380_probe(struct device *dev, struct regmap *regmap,
			enum ad5380_type type, const char *name)
{
	struct iio_dev *indio_dev;
	struct ad5380_state *st;
	unsigned int ctrl = 0;
	int ret;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
	if (indio_dev == NULL) {
		dev_err(dev, "Failed to allocate iio device\n");
		return -ENOMEM;
	}

	st = iio_priv(indio_dev);
	dev_set_drvdata(dev, indio_dev);

	st->chip_info = &ad5380_chip_info_tbl[type];
	st->regmap = regmap;

	indio_dev->name = name;
	indio_dev->info = &ad5380_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->num_channels = st->chip_info->num_channels;

	mutex_init(&st->lock);

	ret = ad5380_alloc_channels(indio_dev);
	if (ret) {
		dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
		return ret;
	}

	if (st->chip_info->int_vref == 2500)
		ctrl |= AD5380_CTRL_INT_VREF_2V5;

	st->vref_reg = devm_regulator_get(dev, "vref");
	if (!IS_ERR(st->vref_reg)) {
		ret = regulator_enable(st->vref_reg);
		if (ret) {
			dev_err(dev, "Failed to enable vref regulators: %d\n",
				ret);
			goto error_free_reg;
		}

		ret = regulator_get_voltage(st->vref_reg);
		if (ret < 0)
			goto error_disable_reg;

		st->vref = ret / 1000;
	} else {
		st->vref = st->chip_info->int_vref;
		ctrl |= AD5380_CTRL_INT_VREF_EN;
	}

	ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);
	if (ret) {
		dev_err(dev, "Failed to write to device: %d\n", ret);
		goto error_disable_reg;
	}

	ret = iio_device_register(indio_dev);
	if (ret) {
		dev_err(dev, "Failed to register iio device: %d\n", ret);
		goto error_disable_reg;
	}

	return 0;

error_disable_reg:
	if (!IS_ERR(st->vref_reg))
		regulator_disable(st->vref_reg);
error_free_reg:
	kfree(indio_dev->channels);

	return ret;
}

static void ad5380_remove(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5380_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);

	kfree(indio_dev->channels);

	if (!IS_ERR(st->vref_reg))
		regulator_disable(st->vref_reg);
}

static bool ad5380_reg_false(struct device *dev, unsigned int reg)
{
	return false;
}

static const struct regmap_config ad5380_regmap_config = {
	.reg_bits = 10,
	.val_bits = 14,

	.max_register = AD5380_REG_DATA(40),
	.cache_type = REGCACHE_RBTREE,

	.volatile_reg = ad5380_reg_false,
	.readable_reg = ad5380_reg_false,
};

#if IS_ENABLED(CONFIG_SPI_MASTER)

static int ad5380_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);
	struct regmap *regmap;

	regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);

	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
}

static void ad5380_spi_remove(struct spi_device *spi)
{
	ad5380_remove(&spi->dev);
}

static const struct spi_device_id ad5380_spi_ids[] = {
	{ "ad5380-3", ID_AD5380_3 },
	{ "ad5380-5", ID_AD5380_5 },
	{ "ad5381-3", ID_AD5381_3 },
	{ "ad5381-5", ID_AD5381_5 },
	{ "ad5382-3", ID_AD5382_3 },
	{ "ad5382-5", ID_AD5382_5 },
	{ "ad5383-3", ID_AD5383_3 },
	{ "ad5383-5", ID_AD5383_5 },
	{ "ad5384-3", ID_AD5380_3 },
	{ "ad5384-5", ID_AD5380_5 },
	{ "ad5390-3", ID_AD5390_3 },
	{ "ad5390-5", ID_AD5390_5 },
	{ "ad5391-3", ID_AD5391_3 },
	{ "ad5391-5", ID_AD5391_5 },
	{ "ad5392-3", ID_AD5392_3 },
	{ "ad5392-5", ID_AD5392_5 },
	{ }
};
MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);

static struct spi_driver ad5380_spi_driver = {
	.driver = {
		   .name = "ad5380",
	},
	.probe = ad5380_spi_probe,
	.remove = ad5380_spi_remove,
	.id_table = ad5380_spi_ids,
};

static inline int ad5380_spi_register_driver(void)
{
	return spi_register_driver(&ad5380_spi_driver);
}

static inline void ad5380_spi_unregister_driver(void)
{
	spi_unregister_driver(&ad5380_spi_driver);
}

#else

static inline int ad5380_spi_register_driver(void)
{
	return 0;
}

static inline void ad5380_spi_unregister_driver(void)
{
}

#endif

#if IS_ENABLED(CONFIG_I2C)

static int ad5380_i2c_probe(struct i2c_client *i2c)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
	struct regmap *regmap;

	regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);

	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
}

static void ad5380_i2c_remove(struct i2c_client *i2c)
{
	ad5380_remove(&i2c->dev);
}

static const struct i2c_device_id ad5380_i2c_ids[] = {
	{ "ad5380-3", ID_AD5380_3 },
	{ "ad5380-5", ID_AD5380_5 },
	{ "ad5381-3", ID_AD5381_3 },
	{ "ad5381-5", ID_AD5381_5 },
	{ "ad5382-3", ID_AD5382_3 },
	{ "ad5382-5", ID_AD5382_5 },
	{ "ad5383-3", ID_AD5383_3 },
	{ "ad5383-5", ID_AD5383_5 },
	{ "ad5384-3", ID_AD5380_3 },
	{ "ad5384-5", ID_AD5380_5 },
	{ "ad5390-3", ID_AD5390_3 },
	{ "ad5390-5", ID_AD5390_5 },
	{ "ad5391-3", ID_AD5391_3 },
	{ "ad5391-5", ID_AD5391_5 },
	{ "ad5392-3", ID_AD5392_3 },
	{ "ad5392-5", ID_AD5392_5 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);

static struct i2c_driver ad5380_i2c_driver = {
	.driver = {
		   .name = "ad5380",
	},
	.probe_new = ad5380_i2c_probe,
	.remove = ad5380_i2c_remove,
	.id_table = ad5380_i2c_ids,
};

static inline int ad5380_i2c_register_driver(void)
{
	return i2c_add_driver(&ad5380_i2c_driver);
}

static inline void ad5380_i2c_unregister_driver(void)
{
	i2c_del_driver(&ad5380_i2c_driver);
}

#else

static inline int ad5380_i2c_register_driver(void)
{
	return 0;
}

static inline void ad5380_i2c_unregister_driver(void)
{
}

#endif

static int __init ad5380_spi_init(void)
{
	int ret;

	ret = ad5380_spi_register_driver();
	if (ret)
		return ret;

	ret = ad5380_i2c_register_driver();
	if (ret) {
		ad5380_spi_unregister_driver();
		return ret;
	}

	return 0;
}
module_init(ad5380_spi_init);

static void __exit ad5380_spi_exit(void)
{
	ad5380_i2c_unregister_driver();
	ad5380_spi_unregister_driver();

}
module_exit(ad5380_spi_exit);

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
MODULE_LICENSE("GPL v2");