xref: /openbmc/linux/drivers/iio/dac/ad5686.c (revision 58c26300)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * AD5686R, AD5685R, AD5684R Digital to analog converters  driver
4  *
5  * Copyright 2011 Analog Devices Inc.
6  */
7 
8 #include <linux/interrupt.h>
9 #include <linux/fs.h>
10 #include <linux/device.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/sysfs.h>
15 #include <linux/regulator/consumer.h>
16 
17 #include <linux/iio/iio.h>
18 #include <linux/iio/sysfs.h>
19 
20 #include "ad5686.h"
21 
22 static const char * const ad5686_powerdown_modes[] = {
23 	"1kohm_to_gnd",
24 	"100kohm_to_gnd",
25 	"three_state"
26 };
27 
ad5686_get_powerdown_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan)28 static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
29 				     const struct iio_chan_spec *chan)
30 {
31 	struct ad5686_state *st = iio_priv(indio_dev);
32 
33 	return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
34 }
35 
ad5686_set_powerdown_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,unsigned int mode)36 static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
37 				     const struct iio_chan_spec *chan,
38 				     unsigned int mode)
39 {
40 	struct ad5686_state *st = iio_priv(indio_dev);
41 
42 	st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
43 	st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));
44 
45 	return 0;
46 }
47 
48 static const struct iio_enum ad5686_powerdown_mode_enum = {
49 	.items = ad5686_powerdown_modes,
50 	.num_items = ARRAY_SIZE(ad5686_powerdown_modes),
51 	.get = ad5686_get_powerdown_mode,
52 	.set = ad5686_set_powerdown_mode,
53 };
54 
ad5686_read_dac_powerdown(struct iio_dev * indio_dev,uintptr_t private,const struct iio_chan_spec * chan,char * buf)55 static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
56 		uintptr_t private, const struct iio_chan_spec *chan, char *buf)
57 {
58 	struct ad5686_state *st = iio_priv(indio_dev);
59 
60 	return sysfs_emit(buf, "%d\n", !!(st->pwr_down_mask &
61 				       (0x3 << (chan->channel * 2))));
62 }
63 
ad5686_write_dac_powerdown(struct iio_dev * indio_dev,uintptr_t private,const struct iio_chan_spec * chan,const char * buf,size_t len)64 static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
65 					  uintptr_t private,
66 					  const struct iio_chan_spec *chan,
67 					  const char *buf,
68 					  size_t len)
69 {
70 	bool readin;
71 	int ret;
72 	struct ad5686_state *st = iio_priv(indio_dev);
73 	unsigned int val, ref_bit_msk;
74 	u8 shift, address = 0;
75 
76 	ret = kstrtobool(buf, &readin);
77 	if (ret)
78 		return ret;
79 
80 	if (readin)
81 		st->pwr_down_mask |= (0x3 << (chan->channel * 2));
82 	else
83 		st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
84 
85 	switch (st->chip_info->regmap_type) {
86 	case AD5310_REGMAP:
87 		shift = 9;
88 		ref_bit_msk = AD5310_REF_BIT_MSK;
89 		break;
90 	case AD5683_REGMAP:
91 		shift = 13;
92 		ref_bit_msk = AD5683_REF_BIT_MSK;
93 		break;
94 	case AD5686_REGMAP:
95 		shift = 0;
96 		ref_bit_msk = 0;
97 		/* AD5674R/AD5679R have 16 channels and 2 powerdown registers */
98 		if (chan->channel > 0x7)
99 			address = 0x8;
100 		break;
101 	case AD5693_REGMAP:
102 		shift = 13;
103 		ref_bit_msk = AD5693_REF_BIT_MSK;
104 		break;
105 	default:
106 		return -EINVAL;
107 	}
108 
109 	val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);
110 	if (!st->use_internal_vref)
111 		val |= ref_bit_msk;
112 
113 	ret = st->write(st, AD5686_CMD_POWERDOWN_DAC,
114 			address, val >> (address * 2));
115 
116 	return ret ? ret : len;
117 }
118 
ad5686_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long m)119 static int ad5686_read_raw(struct iio_dev *indio_dev,
120 			   struct iio_chan_spec const *chan,
121 			   int *val,
122 			   int *val2,
123 			   long m)
124 {
125 	struct ad5686_state *st = iio_priv(indio_dev);
126 	int ret;
127 
128 	switch (m) {
129 	case IIO_CHAN_INFO_RAW:
130 		mutex_lock(&st->lock);
131 		ret = st->read(st, chan->address);
132 		mutex_unlock(&st->lock);
133 		if (ret < 0)
134 			return ret;
135 		*val = (ret >> chan->scan_type.shift) &
136 			GENMASK(chan->scan_type.realbits - 1, 0);
137 		return IIO_VAL_INT;
138 	case IIO_CHAN_INFO_SCALE:
139 		*val = st->vref_mv;
140 		*val2 = chan->scan_type.realbits;
141 		return IIO_VAL_FRACTIONAL_LOG2;
142 	}
143 	return -EINVAL;
144 }
145 
ad5686_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)146 static int ad5686_write_raw(struct iio_dev *indio_dev,
147 			    struct iio_chan_spec const *chan,
148 			    int val,
149 			    int val2,
150 			    long mask)
151 {
152 	struct ad5686_state *st = iio_priv(indio_dev);
153 	int ret;
154 
155 	switch (mask) {
156 	case IIO_CHAN_INFO_RAW:
157 		if (val > (1 << chan->scan_type.realbits) || val < 0)
158 			return -EINVAL;
159 
160 		mutex_lock(&st->lock);
161 		ret = st->write(st,
162 				AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
163 				chan->address,
164 				val << chan->scan_type.shift);
165 		mutex_unlock(&st->lock);
166 		break;
167 	default:
168 		ret = -EINVAL;
169 	}
170 
171 	return ret;
172 }
173 
174 static const struct iio_info ad5686_info = {
175 	.read_raw = ad5686_read_raw,
176 	.write_raw = ad5686_write_raw,
177 };
178 
179 static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
180 	{
181 		.name = "powerdown",
182 		.read = ad5686_read_dac_powerdown,
183 		.write = ad5686_write_dac_powerdown,
184 		.shared = IIO_SEPARATE,
185 	},
186 	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
187 	IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5686_powerdown_mode_enum),
188 	{ },
189 };
190 
191 #define AD5868_CHANNEL(chan, addr, bits, _shift) {		\
192 		.type = IIO_VOLTAGE,				\
193 		.indexed = 1,					\
194 		.output = 1,					\
195 		.channel = chan,				\
196 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
197 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
198 		.address = addr,				\
199 		.scan_type = {					\
200 			.sign = 'u',				\
201 			.realbits = (bits),			\
202 			.storagebits = 16,			\
203 			.shift = (_shift),			\
204 		},						\
205 		.ext_info = ad5686_ext_info,			\
206 }
207 
208 #define DECLARE_AD5693_CHANNELS(name, bits, _shift)		\
209 static const struct iio_chan_spec name[] = {			\
210 		AD5868_CHANNEL(0, 0, bits, _shift),		\
211 }
212 
213 #define DECLARE_AD5338_CHANNELS(name, bits, _shift)		\
214 static const struct iio_chan_spec name[] = {			\
215 		AD5868_CHANNEL(0, 1, bits, _shift),		\
216 		AD5868_CHANNEL(1, 8, bits, _shift),		\
217 }
218 
219 #define DECLARE_AD5686_CHANNELS(name, bits, _shift)		\
220 static const struct iio_chan_spec name[] = {			\
221 		AD5868_CHANNEL(0, 1, bits, _shift),		\
222 		AD5868_CHANNEL(1, 2, bits, _shift),		\
223 		AD5868_CHANNEL(2, 4, bits, _shift),		\
224 		AD5868_CHANNEL(3, 8, bits, _shift),		\
225 }
226 
227 #define DECLARE_AD5676_CHANNELS(name, bits, _shift)		\
228 static const struct iio_chan_spec name[] = {			\
229 		AD5868_CHANNEL(0, 0, bits, _shift),		\
230 		AD5868_CHANNEL(1, 1, bits, _shift),		\
231 		AD5868_CHANNEL(2, 2, bits, _shift),		\
232 		AD5868_CHANNEL(3, 3, bits, _shift),		\
233 		AD5868_CHANNEL(4, 4, bits, _shift),		\
234 		AD5868_CHANNEL(5, 5, bits, _shift),		\
235 		AD5868_CHANNEL(6, 6, bits, _shift),		\
236 		AD5868_CHANNEL(7, 7, bits, _shift),		\
237 }
238 
239 #define DECLARE_AD5679_CHANNELS(name, bits, _shift)		\
240 static const struct iio_chan_spec name[] = {			\
241 		AD5868_CHANNEL(0, 0, bits, _shift),		\
242 		AD5868_CHANNEL(1, 1, bits, _shift),		\
243 		AD5868_CHANNEL(2, 2, bits, _shift),		\
244 		AD5868_CHANNEL(3, 3, bits, _shift),		\
245 		AD5868_CHANNEL(4, 4, bits, _shift),		\
246 		AD5868_CHANNEL(5, 5, bits, _shift),		\
247 		AD5868_CHANNEL(6, 6, bits, _shift),		\
248 		AD5868_CHANNEL(7, 7, bits, _shift),		\
249 		AD5868_CHANNEL(8, 8, bits, _shift),		\
250 		AD5868_CHANNEL(9, 9, bits, _shift),		\
251 		AD5868_CHANNEL(10, 10, bits, _shift),		\
252 		AD5868_CHANNEL(11, 11, bits, _shift),		\
253 		AD5868_CHANNEL(12, 12, bits, _shift),		\
254 		AD5868_CHANNEL(13, 13, bits, _shift),		\
255 		AD5868_CHANNEL(14, 14, bits, _shift),		\
256 		AD5868_CHANNEL(15, 15, bits, _shift),		\
257 }
258 
259 DECLARE_AD5693_CHANNELS(ad5310r_channels, 10, 2);
260 DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
261 DECLARE_AD5338_CHANNELS(ad5337r_channels, 8, 8);
262 DECLARE_AD5338_CHANNELS(ad5338r_channels, 10, 6);
263 DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
264 DECLARE_AD5679_CHANNELS(ad5674r_channels, 12, 4);
265 DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
266 DECLARE_AD5679_CHANNELS(ad5679r_channels, 16, 0);
267 DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
268 DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
269 DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
270 DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
271 DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
272 DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
273 
274 static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
275 	[ID_AD5310R] = {
276 		.channels = ad5310r_channels,
277 		.int_vref_mv = 2500,
278 		.num_channels = 1,
279 		.regmap_type = AD5310_REGMAP,
280 	},
281 	[ID_AD5311R] = {
282 		.channels = ad5311r_channels,
283 		.int_vref_mv = 2500,
284 		.num_channels = 1,
285 		.regmap_type = AD5693_REGMAP,
286 	},
287 	[ID_AD5337R] = {
288 		.channels = ad5337r_channels,
289 		.int_vref_mv = 2500,
290 		.num_channels = 2,
291 		.regmap_type = AD5686_REGMAP,
292 	},
293 	[ID_AD5338R] = {
294 		.channels = ad5338r_channels,
295 		.int_vref_mv = 2500,
296 		.num_channels = 2,
297 		.regmap_type = AD5686_REGMAP,
298 	},
299 	[ID_AD5671R] = {
300 		.channels = ad5672_channels,
301 		.int_vref_mv = 2500,
302 		.num_channels = 8,
303 		.regmap_type = AD5686_REGMAP,
304 	},
305 	[ID_AD5672R] = {
306 		.channels = ad5672_channels,
307 		.int_vref_mv = 2500,
308 		.num_channels = 8,
309 		.regmap_type = AD5686_REGMAP,
310 	},
311 	[ID_AD5673R] = {
312 		.channels = ad5674r_channels,
313 		.int_vref_mv = 2500,
314 		.num_channels = 16,
315 		.regmap_type = AD5686_REGMAP,
316 	},
317 	[ID_AD5674R] = {
318 		.channels = ad5674r_channels,
319 		.int_vref_mv = 2500,
320 		.num_channels = 16,
321 		.regmap_type = AD5686_REGMAP,
322 	},
323 	[ID_AD5675R] = {
324 		.channels = ad5676_channels,
325 		.int_vref_mv = 2500,
326 		.num_channels = 8,
327 		.regmap_type = AD5686_REGMAP,
328 	},
329 	[ID_AD5676] = {
330 		.channels = ad5676_channels,
331 		.num_channels = 8,
332 		.regmap_type = AD5686_REGMAP,
333 	},
334 	[ID_AD5676R] = {
335 		.channels = ad5676_channels,
336 		.int_vref_mv = 2500,
337 		.num_channels = 8,
338 		.regmap_type = AD5686_REGMAP,
339 	},
340 	[ID_AD5677R] = {
341 		.channels = ad5679r_channels,
342 		.int_vref_mv = 2500,
343 		.num_channels = 16,
344 		.regmap_type = AD5686_REGMAP,
345 	},
346 	[ID_AD5679R] = {
347 		.channels = ad5679r_channels,
348 		.int_vref_mv = 2500,
349 		.num_channels = 16,
350 		.regmap_type = AD5686_REGMAP,
351 	},
352 	[ID_AD5681R] = {
353 		.channels = ad5691r_channels,
354 		.int_vref_mv = 2500,
355 		.num_channels = 1,
356 		.regmap_type = AD5683_REGMAP,
357 	},
358 	[ID_AD5682R] = {
359 		.channels = ad5692r_channels,
360 		.int_vref_mv = 2500,
361 		.num_channels = 1,
362 		.regmap_type = AD5683_REGMAP,
363 	},
364 	[ID_AD5683] = {
365 		.channels = ad5693_channels,
366 		.num_channels = 1,
367 		.regmap_type = AD5683_REGMAP,
368 	},
369 	[ID_AD5683R] = {
370 		.channels = ad5693_channels,
371 		.int_vref_mv = 2500,
372 		.num_channels = 1,
373 		.regmap_type = AD5683_REGMAP,
374 	},
375 	[ID_AD5684] = {
376 		.channels = ad5684_channels,
377 		.num_channels = 4,
378 		.regmap_type = AD5686_REGMAP,
379 	},
380 	[ID_AD5684R] = {
381 		.channels = ad5684_channels,
382 		.int_vref_mv = 2500,
383 		.num_channels = 4,
384 		.regmap_type = AD5686_REGMAP,
385 	},
386 	[ID_AD5685R] = {
387 		.channels = ad5685r_channels,
388 		.int_vref_mv = 2500,
389 		.num_channels = 4,
390 		.regmap_type = AD5686_REGMAP,
391 	},
392 	[ID_AD5686] = {
393 		.channels = ad5686_channels,
394 		.num_channels = 4,
395 		.regmap_type = AD5686_REGMAP,
396 	},
397 	[ID_AD5686R] = {
398 		.channels = ad5686_channels,
399 		.int_vref_mv = 2500,
400 		.num_channels = 4,
401 		.regmap_type = AD5686_REGMAP,
402 	},
403 	[ID_AD5691R] = {
404 		.channels = ad5691r_channels,
405 		.int_vref_mv = 2500,
406 		.num_channels = 1,
407 		.regmap_type = AD5693_REGMAP,
408 	},
409 	[ID_AD5692R] = {
410 		.channels = ad5692r_channels,
411 		.int_vref_mv = 2500,
412 		.num_channels = 1,
413 		.regmap_type = AD5693_REGMAP,
414 	},
415 	[ID_AD5693] = {
416 		.channels = ad5693_channels,
417 		.num_channels = 1,
418 		.regmap_type = AD5693_REGMAP,
419 	},
420 	[ID_AD5693R] = {
421 		.channels = ad5693_channels,
422 		.int_vref_mv = 2500,
423 		.num_channels = 1,
424 		.regmap_type = AD5693_REGMAP,
425 	},
426 	[ID_AD5694] = {
427 		.channels = ad5684_channels,
428 		.num_channels = 4,
429 		.regmap_type = AD5686_REGMAP,
430 	},
431 	[ID_AD5694R] = {
432 		.channels = ad5684_channels,
433 		.int_vref_mv = 2500,
434 		.num_channels = 4,
435 		.regmap_type = AD5686_REGMAP,
436 	},
437 	[ID_AD5696] = {
438 		.channels = ad5686_channels,
439 		.num_channels = 4,
440 		.regmap_type = AD5686_REGMAP,
441 	},
442 	[ID_AD5696R] = {
443 		.channels = ad5686_channels,
444 		.int_vref_mv = 2500,
445 		.num_channels = 4,
446 		.regmap_type = AD5686_REGMAP,
447 	},
448 };
449 
ad5686_probe(struct device * dev,enum ad5686_supported_device_ids chip_type,const char * name,ad5686_write_func write,ad5686_read_func read)450 int ad5686_probe(struct device *dev,
451 		 enum ad5686_supported_device_ids chip_type,
452 		 const char *name, ad5686_write_func write,
453 		 ad5686_read_func read)
454 {
455 	struct ad5686_state *st;
456 	struct iio_dev *indio_dev;
457 	unsigned int val, ref_bit_msk;
458 	u8 cmd;
459 	int ret, i, voltage_uv = 0;
460 
461 	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
462 	if (indio_dev == NULL)
463 		return  -ENOMEM;
464 
465 	st = iio_priv(indio_dev);
466 	dev_set_drvdata(dev, indio_dev);
467 
468 	st->dev = dev;
469 	st->write = write;
470 	st->read = read;
471 
472 	st->reg = devm_regulator_get_optional(dev, "vcc");
473 	if (!IS_ERR(st->reg)) {
474 		ret = regulator_enable(st->reg);
475 		if (ret)
476 			return ret;
477 
478 		ret = regulator_get_voltage(st->reg);
479 		if (ret < 0)
480 			goto error_disable_reg;
481 
482 		voltage_uv = ret;
483 	}
484 
485 	st->chip_info = &ad5686_chip_info_tbl[chip_type];
486 
487 	if (voltage_uv)
488 		st->vref_mv = voltage_uv / 1000;
489 	else
490 		st->vref_mv = st->chip_info->int_vref_mv;
491 
492 	/* Set all the power down mode for all channels to 1K pulldown */
493 	for (i = 0; i < st->chip_info->num_channels; i++)
494 		st->pwr_down_mode |= (0x01 << (i * 2));
495 
496 	indio_dev->name = name;
497 	indio_dev->info = &ad5686_info;
498 	indio_dev->modes = INDIO_DIRECT_MODE;
499 	indio_dev->channels = st->chip_info->channels;
500 	indio_dev->num_channels = st->chip_info->num_channels;
501 
502 	mutex_init(&st->lock);
503 
504 	switch (st->chip_info->regmap_type) {
505 	case AD5310_REGMAP:
506 		cmd = AD5686_CMD_CONTROL_REG;
507 		ref_bit_msk = AD5310_REF_BIT_MSK;
508 		st->use_internal_vref = !voltage_uv;
509 		break;
510 	case AD5683_REGMAP:
511 		cmd = AD5686_CMD_CONTROL_REG;
512 		ref_bit_msk = AD5683_REF_BIT_MSK;
513 		st->use_internal_vref = !voltage_uv;
514 		break;
515 	case AD5686_REGMAP:
516 		cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
517 		ref_bit_msk = 0;
518 		break;
519 	case AD5693_REGMAP:
520 		cmd = AD5686_CMD_CONTROL_REG;
521 		ref_bit_msk = AD5693_REF_BIT_MSK;
522 		st->use_internal_vref = !voltage_uv;
523 		break;
524 	default:
525 		ret = -EINVAL;
526 		goto error_disable_reg;
527 	}
528 
529 	val = (voltage_uv | ref_bit_msk);
530 
531 	ret = st->write(st, cmd, 0, !!val);
532 	if (ret)
533 		goto error_disable_reg;
534 
535 	ret = iio_device_register(indio_dev);
536 	if (ret)
537 		goto error_disable_reg;
538 
539 	return 0;
540 
541 error_disable_reg:
542 	if (!IS_ERR(st->reg))
543 		regulator_disable(st->reg);
544 	return ret;
545 }
546 EXPORT_SYMBOL_NS_GPL(ad5686_probe, IIO_AD5686);
547 
ad5686_remove(struct device * dev)548 void ad5686_remove(struct device *dev)
549 {
550 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
551 	struct ad5686_state *st = iio_priv(indio_dev);
552 
553 	iio_device_unregister(indio_dev);
554 	if (!IS_ERR(st->reg))
555 		regulator_disable(st->reg);
556 }
557 EXPORT_SYMBOL_NS_GPL(ad5686_remove, IIO_AD5686);
558 
559 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
560 MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
561 MODULE_LICENSE("GPL v2");
562