1
2
3
4
5
6
7
8
9#include <linux/device.h>
10#include <linux/err.h>
11#include <linux/i2c.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/spi/spi.h>
15#include <linux/slab.h>
16#include <linux/sysfs.h>
17#include <linux/regmap.h>
18#include <linux/regulator/consumer.h>
19
20#include <linux/iio/iio.h>
21#include <linux/iio/sysfs.h>
22
23#define AD5380_REG_DATA(x) (((x) << 2) | 3)
24#define AD5380_REG_OFFSET(x) (((x) << 2) | 2)
25#define AD5380_REG_GAIN(x) (((x) << 2) | 1)
26#define AD5380_REG_SF_PWR_DOWN (8 << 2)
27#define AD5380_REG_SF_PWR_UP (9 << 2)
28#define AD5380_REG_SF_CTRL (12 << 2)
29
30#define AD5380_CTRL_PWR_DOWN_MODE_OFFSET 13
31#define AD5380_CTRL_INT_VREF_2V5 BIT(12)
32#define AD5380_CTRL_INT_VREF_EN BIT(10)
33
34
35
36
37
38
39
40
41struct ad5380_chip_info {
42 struct iio_chan_spec channel_template;
43 unsigned int num_channels;
44 unsigned int int_vref;
45};
46
47
48
49
50
51
52
53
54
55
56struct ad5380_state {
57 struct regmap *regmap;
58 const struct ad5380_chip_info *chip_info;
59 struct regulator *vref_reg;
60 int vref;
61 bool pwr_down;
62};
63
64enum ad5380_type {
65 ID_AD5380_3,
66 ID_AD5380_5,
67 ID_AD5381_3,
68 ID_AD5381_5,
69 ID_AD5382_3,
70 ID_AD5382_5,
71 ID_AD5383_3,
72 ID_AD5383_5,
73 ID_AD5390_3,
74 ID_AD5390_5,
75 ID_AD5391_3,
76 ID_AD5391_5,
77 ID_AD5392_3,
78 ID_AD5392_5,
79};
80
81static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev,
82 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
83{
84 struct ad5380_state *st = iio_priv(indio_dev);
85
86 return sprintf(buf, "%d\n", st->pwr_down);
87}
88
89static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev,
90 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
91 size_t len)
92{
93 struct ad5380_state *st = iio_priv(indio_dev);
94 bool pwr_down;
95 int ret;
96
97 ret = strtobool(buf, &pwr_down);
98 if (ret)
99 return ret;
100
101 mutex_lock(&indio_dev->mlock);
102
103 if (pwr_down)
104 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);
105 else
106 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0);
107
108 st->pwr_down = pwr_down;
109
110 mutex_unlock(&indio_dev->mlock);
111
112 return ret ? ret : len;
113}
114
115static const char * const ad5380_powerdown_modes[] = {
116 "100kohm_to_gnd",
117 "three_state",
118};
119
120static int ad5380_get_powerdown_mode(struct iio_dev *indio_dev,
121 const struct iio_chan_spec *chan)
122{
123 struct ad5380_state *st = iio_priv(indio_dev);
124 unsigned int mode;
125 int ret;
126
127 ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);
128 if (ret)
129 return ret;
130
131 mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;
132
133 return mode;
134}
135
136static int ad5380_set_powerdown_mode(struct iio_dev *indio_dev,
137 const struct iio_chan_spec *chan, unsigned int mode)
138{
139 struct ad5380_state *st = iio_priv(indio_dev);
140 int ret;
141
142 ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL,
143 1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET,
144 mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);
145
146 return ret;
147}
148
149static const struct iio_enum ad5380_powerdown_mode_enum = {
150 .items = ad5380_powerdown_modes,
151 .num_items = ARRAY_SIZE(ad5380_powerdown_modes),
152 .get = ad5380_get_powerdown_mode,
153 .set = ad5380_set_powerdown_mode,
154};
155
156static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,
157 long info)
158{
159 switch (info) {
160 case IIO_CHAN_INFO_RAW:
161 return AD5380_REG_DATA(chan->address);
162 case IIO_CHAN_INFO_CALIBBIAS:
163 return AD5380_REG_OFFSET(chan->address);
164 case IIO_CHAN_INFO_CALIBSCALE:
165 return AD5380_REG_GAIN(chan->address);
166 default:
167 break;
168 }
169
170 return 0;
171}
172
173static int ad5380_write_raw(struct iio_dev *indio_dev,
174 struct iio_chan_spec const *chan, int val, int val2, long info)
175{
176 const unsigned int max_val = (1 << chan->scan_type.realbits);
177 struct ad5380_state *st = iio_priv(indio_dev);
178
179 switch (info) {
180 case IIO_CHAN_INFO_RAW:
181 case IIO_CHAN_INFO_CALIBSCALE:
182 if (val >= max_val || val < 0)
183 return -EINVAL;
184
185 return regmap_write(st->regmap,
186 ad5380_info_to_reg(chan, info),
187 val << chan->scan_type.shift);
188 case IIO_CHAN_INFO_CALIBBIAS:
189 val += (1 << chan->scan_type.realbits) / 2;
190 if (val >= max_val || val < 0)
191 return -EINVAL;
192
193 return regmap_write(st->regmap,
194 AD5380_REG_OFFSET(chan->address),
195 val << chan->scan_type.shift);
196 default:
197 break;
198 }
199 return -EINVAL;
200}
201
202static int ad5380_read_raw(struct iio_dev *indio_dev,
203 struct iio_chan_spec const *chan, int *val, int *val2, long info)
204{
205 struct ad5380_state *st = iio_priv(indio_dev);
206 int ret;
207
208 switch (info) {
209 case IIO_CHAN_INFO_RAW:
210 case IIO_CHAN_INFO_CALIBSCALE:
211 ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),
212 val);
213 if (ret)
214 return ret;
215 *val >>= chan->scan_type.shift;
216 return IIO_VAL_INT;
217 case IIO_CHAN_INFO_CALIBBIAS:
218 ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),
219 val);
220 if (ret)
221 return ret;
222 *val >>= chan->scan_type.shift;
223 val -= (1 << chan->scan_type.realbits) / 2;
224 return IIO_VAL_INT;
225 case IIO_CHAN_INFO_SCALE:
226 *val = 2 * st->vref;
227 *val2 = chan->scan_type.realbits;
228 return IIO_VAL_FRACTIONAL_LOG2;
229 default:
230 break;
231 }
232
233 return -EINVAL;
234}
235
236static const struct iio_info ad5380_info = {
237 .read_raw = ad5380_read_raw,
238 .write_raw = ad5380_write_raw,
239};
240
241static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
242 {
243 .name = "powerdown",
244 .read = ad5380_read_dac_powerdown,
245 .write = ad5380_write_dac_powerdown,
246 .shared = IIO_SEPARATE,
247 },
248 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
249 &ad5380_powerdown_mode_enum),
250 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
251 { },
252};
253
254#define AD5380_CHANNEL(_bits) { \
255 .type = IIO_VOLTAGE, \
256 .indexed = 1, \
257 .output = 1, \
258 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
259 BIT(IIO_CHAN_INFO_CALIBSCALE) | \
260 BIT(IIO_CHAN_INFO_CALIBBIAS), \
261 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
262 .scan_type = { \
263 .sign = 'u', \
264 .realbits = (_bits), \
265 .storagebits = 16, \
266 .shift = 14 - (_bits), \
267 }, \
268 .ext_info = ad5380_ext_info, \
269}
270
271static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {
272 [ID_AD5380_3] = {
273 .channel_template = AD5380_CHANNEL(14),
274 .num_channels = 40,
275 .int_vref = 1250,
276 },
277 [ID_AD5380_5] = {
278 .channel_template = AD5380_CHANNEL(14),
279 .num_channels = 40,
280 .int_vref = 2500,
281 },
282 [ID_AD5381_3] = {
283 .channel_template = AD5380_CHANNEL(12),
284 .num_channels = 16,
285 .int_vref = 1250,
286 },
287 [ID_AD5381_5] = {
288 .channel_template = AD5380_CHANNEL(12),
289 .num_channels = 16,
290 .int_vref = 2500,
291 },
292 [ID_AD5382_3] = {
293 .channel_template = AD5380_CHANNEL(14),
294 .num_channels = 32,
295 .int_vref = 1250,
296 },
297 [ID_AD5382_5] = {
298 .channel_template = AD5380_CHANNEL(14),
299 .num_channels = 32,
300 .int_vref = 2500,
301 },
302 [ID_AD5383_3] = {
303 .channel_template = AD5380_CHANNEL(12),
304 .num_channels = 32,
305 .int_vref = 1250,
306 },
307 [ID_AD5383_5] = {
308 .channel_template = AD5380_CHANNEL(12),
309 .num_channels = 32,
310 .int_vref = 2500,
311 },
312 [ID_AD5390_3] = {
313 .channel_template = AD5380_CHANNEL(14),
314 .num_channels = 16,
315 .int_vref = 1250,
316 },
317 [ID_AD5390_5] = {
318 .channel_template = AD5380_CHANNEL(14),
319 .num_channels = 16,
320 .int_vref = 2500,
321 },
322 [ID_AD5391_3] = {
323 .channel_template = AD5380_CHANNEL(12),
324 .num_channels = 16,
325 .int_vref = 1250,
326 },
327 [ID_AD5391_5] = {
328 .channel_template = AD5380_CHANNEL(12),
329 .num_channels = 16,
330 .int_vref = 2500,
331 },
332 [ID_AD5392_3] = {
333 .channel_template = AD5380_CHANNEL(14),
334 .num_channels = 8,
335 .int_vref = 1250,
336 },
337 [ID_AD5392_5] = {
338 .channel_template = AD5380_CHANNEL(14),
339 .num_channels = 8,
340 .int_vref = 2500,
341 },
342};
343
344static int ad5380_alloc_channels(struct iio_dev *indio_dev)
345{
346 struct ad5380_state *st = iio_priv(indio_dev);
347 struct iio_chan_spec *channels;
348 unsigned int i;
349
350 channels = kcalloc(st->chip_info->num_channels,
351 sizeof(struct iio_chan_spec), GFP_KERNEL);
352
353 if (!channels)
354 return -ENOMEM;
355
356 for (i = 0; i < st->chip_info->num_channels; ++i) {
357 channels[i] = st->chip_info->channel_template;
358 channels[i].channel = i;
359 channels[i].address = i;
360 }
361
362 indio_dev->channels = channels;
363
364 return 0;
365}
366
367static int ad5380_probe(struct device *dev, struct regmap *regmap,
368 enum ad5380_type type, const char *name)
369{
370 struct iio_dev *indio_dev;
371 struct ad5380_state *st;
372 unsigned int ctrl = 0;
373 int ret;
374
375 indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
376 if (indio_dev == NULL) {
377 dev_err(dev, "Failed to allocate iio device\n");
378 return -ENOMEM;
379 }
380
381 st = iio_priv(indio_dev);
382 dev_set_drvdata(dev, indio_dev);
383
384 st->chip_info = &ad5380_chip_info_tbl[type];
385 st->regmap = regmap;
386
387 indio_dev->dev.parent = dev;
388 indio_dev->name = name;
389 indio_dev->info = &ad5380_info;
390 indio_dev->modes = INDIO_DIRECT_MODE;
391 indio_dev->num_channels = st->chip_info->num_channels;
392
393 ret = ad5380_alloc_channels(indio_dev);
394 if (ret) {
395 dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
396 return ret;
397 }
398
399 if (st->chip_info->int_vref == 2500)
400 ctrl |= AD5380_CTRL_INT_VREF_2V5;
401
402 st->vref_reg = devm_regulator_get(dev, "vref");
403 if (!IS_ERR(st->vref_reg)) {
404 ret = regulator_enable(st->vref_reg);
405 if (ret) {
406 dev_err(dev, "Failed to enable vref regulators: %d\n",
407 ret);
408 goto error_free_reg;
409 }
410
411 ret = regulator_get_voltage(st->vref_reg);
412 if (ret < 0)
413 goto error_disable_reg;
414
415 st->vref = ret / 1000;
416 } else {
417 st->vref = st->chip_info->int_vref;
418 ctrl |= AD5380_CTRL_INT_VREF_EN;
419 }
420
421 ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);
422 if (ret) {
423 dev_err(dev, "Failed to write to device: %d\n", ret);
424 goto error_disable_reg;
425 }
426
427 ret = iio_device_register(indio_dev);
428 if (ret) {
429 dev_err(dev, "Failed to register iio device: %d\n", ret);
430 goto error_disable_reg;
431 }
432
433 return 0;
434
435error_disable_reg:
436 if (!IS_ERR(st->vref_reg))
437 regulator_disable(st->vref_reg);
438error_free_reg:
439 kfree(indio_dev->channels);
440
441 return ret;
442}
443
444static int ad5380_remove(struct device *dev)
445{
446 struct iio_dev *indio_dev = dev_get_drvdata(dev);
447 struct ad5380_state *st = iio_priv(indio_dev);
448
449 iio_device_unregister(indio_dev);
450
451 kfree(indio_dev->channels);
452
453 if (!IS_ERR(st->vref_reg)) {
454 regulator_disable(st->vref_reg);
455 }
456
457 return 0;
458}
459
460static bool ad5380_reg_false(struct device *dev, unsigned int reg)
461{
462 return false;
463}
464
465static const struct regmap_config ad5380_regmap_config = {
466 .reg_bits = 10,
467 .val_bits = 14,
468
469 .max_register = AD5380_REG_DATA(40),
470 .cache_type = REGCACHE_RBTREE,
471
472 .volatile_reg = ad5380_reg_false,
473 .readable_reg = ad5380_reg_false,
474};
475
476#if IS_ENABLED(CONFIG_SPI_MASTER)
477
478static int ad5380_spi_probe(struct spi_device *spi)
479{
480 const struct spi_device_id *id = spi_get_device_id(spi);
481 struct regmap *regmap;
482
483 regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);
484
485 if (IS_ERR(regmap))
486 return PTR_ERR(regmap);
487
488 return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
489}
490
491static int ad5380_spi_remove(struct spi_device *spi)
492{
493 return ad5380_remove(&spi->dev);
494}
495
496static const struct spi_device_id ad5380_spi_ids[] = {
497 { "ad5380-3", ID_AD5380_3 },
498 { "ad5380-5", ID_AD5380_5 },
499 { "ad5381-3", ID_AD5381_3 },
500 { "ad5381-5", ID_AD5381_5 },
501 { "ad5382-3", ID_AD5382_3 },
502 { "ad5382-5", ID_AD5382_5 },
503 { "ad5383-3", ID_AD5383_3 },
504 { "ad5383-5", ID_AD5383_5 },
505 { "ad5384-3", ID_AD5380_3 },
506 { "ad5384-5", ID_AD5380_5 },
507 { "ad5390-3", ID_AD5390_3 },
508 { "ad5390-5", ID_AD5390_5 },
509 { "ad5391-3", ID_AD5391_3 },
510 { "ad5391-5", ID_AD5391_5 },
511 { "ad5392-3", ID_AD5392_3 },
512 { "ad5392-5", ID_AD5392_5 },
513 { }
514};
515MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);
516
517static struct spi_driver ad5380_spi_driver = {
518 .driver = {
519 .name = "ad5380",
520 },
521 .probe = ad5380_spi_probe,
522 .remove = ad5380_spi_remove,
523 .id_table = ad5380_spi_ids,
524};
525
526static inline int ad5380_spi_register_driver(void)
527{
528 return spi_register_driver(&ad5380_spi_driver);
529}
530
531static inline void ad5380_spi_unregister_driver(void)
532{
533 spi_unregister_driver(&ad5380_spi_driver);
534}
535
536#else
537
538static inline int ad5380_spi_register_driver(void)
539{
540 return 0;
541}
542
543static inline void ad5380_spi_unregister_driver(void)
544{
545}
546
547#endif
548
549#if IS_ENABLED(CONFIG_I2C)
550
551static int ad5380_i2c_probe(struct i2c_client *i2c,
552 const struct i2c_device_id *id)
553{
554 struct regmap *regmap;
555
556 regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);
557
558 if (IS_ERR(regmap))
559 return PTR_ERR(regmap);
560
561 return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
562}
563
564static int ad5380_i2c_remove(struct i2c_client *i2c)
565{
566 return ad5380_remove(&i2c->dev);
567}
568
569static const struct i2c_device_id ad5380_i2c_ids[] = {
570 { "ad5380-3", ID_AD5380_3 },
571 { "ad5380-5", ID_AD5380_5 },
572 { "ad5381-3", ID_AD5381_3 },
573 { "ad5381-5", ID_AD5381_5 },
574 { "ad5382-3", ID_AD5382_3 },
575 { "ad5382-5", ID_AD5382_5 },
576 { "ad5383-3", ID_AD5383_3 },
577 { "ad5383-5", ID_AD5383_5 },
578 { "ad5384-3", ID_AD5380_3 },
579 { "ad5384-5", ID_AD5380_5 },
580 { "ad5390-3", ID_AD5390_3 },
581 { "ad5390-5", ID_AD5390_5 },
582 { "ad5391-3", ID_AD5391_3 },
583 { "ad5391-5", ID_AD5391_5 },
584 { "ad5392-3", ID_AD5392_3 },
585 { "ad5392-5", ID_AD5392_5 },
586 { }
587};
588MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);
589
590static struct i2c_driver ad5380_i2c_driver = {
591 .driver = {
592 .name = "ad5380",
593 },
594 .probe = ad5380_i2c_probe,
595 .remove = ad5380_i2c_remove,
596 .id_table = ad5380_i2c_ids,
597};
598
599static inline int ad5380_i2c_register_driver(void)
600{
601 return i2c_add_driver(&ad5380_i2c_driver);
602}
603
604static inline void ad5380_i2c_unregister_driver(void)
605{
606 i2c_del_driver(&ad5380_i2c_driver);
607}
608
609#else
610
611static inline int ad5380_i2c_register_driver(void)
612{
613 return 0;
614}
615
616static inline void ad5380_i2c_unregister_driver(void)
617{
618}
619
620#endif
621
622static int __init ad5380_spi_init(void)
623{
624 int ret;
625
626 ret = ad5380_spi_register_driver();
627 if (ret)
628 return ret;
629
630 ret = ad5380_i2c_register_driver();
631 if (ret) {
632 ad5380_spi_unregister_driver();
633 return ret;
634 }
635
636 return 0;
637}
638module_init(ad5380_spi_init);
639
640static void __exit ad5380_spi_exit(void)
641{
642 ad5380_i2c_unregister_driver();
643 ad5380_spi_unregister_driver();
644
645}
646module_exit(ad5380_spi_exit);
647
648MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
649MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
650MODULE_LICENSE("GPL v2");
651
