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10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/i2c.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/spi/spi.h>
16#include <linux/slab.h>
17#include <linux/sysfs.h>
18#include <linux/regmap.h>
19#include <linux/regulator/consumer.h>
20
21#include <linux/iio/iio.h>
22#include <linux/iio/sysfs.h>
23
24#define AD5380_REG_DATA(x) (((x) << 2) | 3)
25#define AD5380_REG_OFFSET(x) (((x) << 2) | 2)
26#define AD5380_REG_GAIN(x) (((x) << 2) | 1)
27#define AD5380_REG_SF_PWR_DOWN (8 << 2)
28#define AD5380_REG_SF_PWR_UP (9 << 2)
29#define AD5380_REG_SF_CTRL (12 << 2)
30
31#define AD5380_CTRL_PWR_DOWN_MODE_OFFSET 13
32#define AD5380_CTRL_INT_VREF_2V5 BIT(12)
33#define AD5380_CTRL_INT_VREF_EN BIT(10)
34
35
36
37
38
39
40
41
42struct ad5380_chip_info {
43 struct iio_chan_spec channel_template;
44 unsigned int num_channels;
45 unsigned int int_vref;
46};
47
48
49
50
51
52
53
54
55
56
57struct ad5380_state {
58 struct regmap *regmap;
59 const struct ad5380_chip_info *chip_info;
60 struct regulator *vref_reg;
61 int vref;
62 bool pwr_down;
63};
64
65enum ad5380_type {
66 ID_AD5380_3,
67 ID_AD5380_5,
68 ID_AD5381_3,
69 ID_AD5381_5,
70 ID_AD5382_3,
71 ID_AD5382_5,
72 ID_AD5383_3,
73 ID_AD5383_5,
74 ID_AD5390_3,
75 ID_AD5390_5,
76 ID_AD5391_3,
77 ID_AD5391_5,
78 ID_AD5392_3,
79 ID_AD5392_5,
80};
81
82static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev,
83 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
84{
85 struct ad5380_state *st = iio_priv(indio_dev);
86
87 return sprintf(buf, "%d\n", st->pwr_down);
88}
89
90static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev,
91 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
92 size_t len)
93{
94 struct ad5380_state *st = iio_priv(indio_dev);
95 bool pwr_down;
96 int ret;
97
98 ret = strtobool(buf, &pwr_down);
99 if (ret)
100 return ret;
101
102 mutex_lock(&indio_dev->mlock);
103
104 if (pwr_down)
105 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);
106 else
107 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0);
108
109 st->pwr_down = pwr_down;
110
111 mutex_unlock(&indio_dev->mlock);
112
113 return ret ? ret : len;
114}
115
116static const char * const ad5380_powerdown_modes[] = {
117 "100kohm_to_gnd",
118 "three_state",
119};
120
121static int ad5380_get_powerdown_mode(struct iio_dev *indio_dev,
122 const struct iio_chan_spec *chan)
123{
124 struct ad5380_state *st = iio_priv(indio_dev);
125 unsigned int mode;
126 int ret;
127
128 ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);
129 if (ret)
130 return ret;
131
132 mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;
133
134 return mode;
135}
136
137static int ad5380_set_powerdown_mode(struct iio_dev *indio_dev,
138 const struct iio_chan_spec *chan, unsigned int mode)
139{
140 struct ad5380_state *st = iio_priv(indio_dev);
141 int ret;
142
143 ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL,
144 1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET,
145 mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);
146
147 return ret;
148}
149
150static const struct iio_enum ad5380_powerdown_mode_enum = {
151 .items = ad5380_powerdown_modes,
152 .num_items = ARRAY_SIZE(ad5380_powerdown_modes),
153 .get = ad5380_get_powerdown_mode,
154 .set = ad5380_set_powerdown_mode,
155};
156
157static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,
158 long info)
159{
160 switch (info) {
161 case 0:
162 return AD5380_REG_DATA(chan->address);
163 case IIO_CHAN_INFO_CALIBBIAS:
164 return AD5380_REG_OFFSET(chan->address);
165 case IIO_CHAN_INFO_CALIBSCALE:
166 return AD5380_REG_GAIN(chan->address);
167 default:
168 break;
169 }
170
171 return 0;
172}
173
174static int ad5380_write_raw(struct iio_dev *indio_dev,
175 struct iio_chan_spec const *chan, int val, int val2, long info)
176{
177 const unsigned int max_val = (1 << chan->scan_type.realbits);
178 struct ad5380_state *st = iio_priv(indio_dev);
179
180 switch (info) {
181 case IIO_CHAN_INFO_RAW:
182 case IIO_CHAN_INFO_CALIBSCALE:
183 if (val >= max_val || val < 0)
184 return -EINVAL;
185
186 return regmap_write(st->regmap,
187 ad5380_info_to_reg(chan, info),
188 val << chan->scan_type.shift);
189 case IIO_CHAN_INFO_CALIBBIAS:
190 val += (1 << chan->scan_type.realbits) / 2;
191 if (val >= max_val || val < 0)
192 return -EINVAL;
193
194 return regmap_write(st->regmap,
195 AD5380_REG_OFFSET(chan->address),
196 val << chan->scan_type.shift);
197 default:
198 break;
199 }
200 return -EINVAL;
201}
202
203static int ad5380_read_raw(struct iio_dev *indio_dev,
204 struct iio_chan_spec const *chan, int *val, int *val2, long info)
205{
206 struct ad5380_state *st = iio_priv(indio_dev);
207 unsigned long scale_uv;
208 int ret;
209
210 switch (info) {
211 case IIO_CHAN_INFO_RAW:
212 case IIO_CHAN_INFO_CALIBSCALE:
213 ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),
214 val);
215 if (ret)
216 return ret;
217 *val >>= chan->scan_type.shift;
218 return IIO_VAL_INT;
219 case IIO_CHAN_INFO_CALIBBIAS:
220 ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),
221 val);
222 if (ret)
223 return ret;
224 *val >>= chan->scan_type.shift;
225 val -= (1 << chan->scan_type.realbits) / 2;
226 return IIO_VAL_INT;
227 case IIO_CHAN_INFO_SCALE:
228 scale_uv = ((2 * st->vref) >> chan->scan_type.realbits) * 100;
229 *val = scale_uv / 100000;
230 *val2 = (scale_uv % 100000) * 10;
231 return IIO_VAL_INT_PLUS_MICRO;
232 default:
233 break;
234 }
235
236 return -EINVAL;
237}
238
239static const struct iio_info ad5380_info = {
240 .read_raw = ad5380_read_raw,
241 .write_raw = ad5380_write_raw,
242 .driver_module = THIS_MODULE,
243};
244
245static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
246 {
247 .name = "powerdown",
248 .read = ad5380_read_dac_powerdown,
249 .write = ad5380_write_dac_powerdown,
250 },
251 IIO_ENUM("powerdown_mode", true, &ad5380_powerdown_mode_enum),
252 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
253 { },
254};
255
256#define AD5380_CHANNEL(_bits) { \
257 .type = IIO_VOLTAGE, \
258 .indexed = 1, \
259 .output = 1, \
260 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
261 BIT(IIO_CHAN_INFO_CALIBSCALE) | \
262 BIT(IIO_CHAN_INFO_CALIBBIAS), \
263 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
264 .scan_type = IIO_ST('u', (_bits), 16, 14 - (_bits)), \
265 .ext_info = ad5380_ext_info, \
266}
267
268static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {
269 [ID_AD5380_3] = {
270 .channel_template = AD5380_CHANNEL(14),
271 .num_channels = 40,
272 .int_vref = 1250000,
273 },
274 [ID_AD5380_5] = {
275 .channel_template = AD5380_CHANNEL(14),
276 .num_channels = 40,
277 .int_vref = 2500000,
278 },
279 [ID_AD5381_3] = {
280 .channel_template = AD5380_CHANNEL(12),
281 .num_channels = 16,
282 .int_vref = 1250000,
283 },
284 [ID_AD5381_5] = {
285 .channel_template = AD5380_CHANNEL(12),
286 .num_channels = 16,
287 .int_vref = 2500000,
288 },
289 [ID_AD5382_3] = {
290 .channel_template = AD5380_CHANNEL(14),
291 .num_channels = 32,
292 .int_vref = 1250000,
293 },
294 [ID_AD5382_5] = {
295 .channel_template = AD5380_CHANNEL(14),
296 .num_channels = 32,
297 .int_vref = 2500000,
298 },
299 [ID_AD5383_3] = {
300 .channel_template = AD5380_CHANNEL(12),
301 .num_channels = 32,
302 .int_vref = 1250000,
303 },
304 [ID_AD5383_5] = {
305 .channel_template = AD5380_CHANNEL(12),
306 .num_channels = 32,
307 .int_vref = 2500000,
308 },
309 [ID_AD5390_3] = {
310 .channel_template = AD5380_CHANNEL(14),
311 .num_channels = 16,
312 .int_vref = 1250000,
313 },
314 [ID_AD5390_5] = {
315 .channel_template = AD5380_CHANNEL(14),
316 .num_channels = 16,
317 .int_vref = 2500000,
318 },
319 [ID_AD5391_3] = {
320 .channel_template = AD5380_CHANNEL(12),
321 .num_channels = 16,
322 .int_vref = 1250000,
323 },
324 [ID_AD5391_5] = {
325 .channel_template = AD5380_CHANNEL(12),
326 .num_channels = 16,
327 .int_vref = 2500000,
328 },
329 [ID_AD5392_3] = {
330 .channel_template = AD5380_CHANNEL(14),
331 .num_channels = 8,
332 .int_vref = 1250000,
333 },
334 [ID_AD5392_5] = {
335 .channel_template = AD5380_CHANNEL(14),
336 .num_channels = 8,
337 .int_vref = 2500000,
338 },
339};
340
341static int ad5380_alloc_channels(struct iio_dev *indio_dev)
342{
343 struct ad5380_state *st = iio_priv(indio_dev);
344 struct iio_chan_spec *channels;
345 unsigned int i;
346
347 channels = kcalloc(st->chip_info->num_channels,
348 sizeof(struct iio_chan_spec), GFP_KERNEL);
349
350 if (!channels)
351 return -ENOMEM;
352
353 for (i = 0; i < st->chip_info->num_channels; ++i) {
354 channels[i] = st->chip_info->channel_template;
355 channels[i].channel = i;
356 channels[i].address = i;
357 }
358
359 indio_dev->channels = channels;
360
361 return 0;
362}
363
364static int ad5380_probe(struct device *dev, struct regmap *regmap,
365 enum ad5380_type type, const char *name)
366{
367 struct iio_dev *indio_dev;
368 struct ad5380_state *st;
369 unsigned int ctrl = 0;
370 int ret;
371
372 indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
373 if (indio_dev == NULL) {
374 dev_err(dev, "Failed to allocate iio device\n");
375 return -ENOMEM;
376 }
377
378 st = iio_priv(indio_dev);
379 dev_set_drvdata(dev, indio_dev);
380
381 st->chip_info = &ad5380_chip_info_tbl[type];
382 st->regmap = regmap;
383
384 indio_dev->dev.parent = dev;
385 indio_dev->name = name;
386 indio_dev->info = &ad5380_info;
387 indio_dev->modes = INDIO_DIRECT_MODE;
388 indio_dev->num_channels = st->chip_info->num_channels;
389
390 ret = ad5380_alloc_channels(indio_dev);
391 if (ret) {
392 dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
393 return ret;
394 }
395
396 if (st->chip_info->int_vref == 2500000)
397 ctrl |= AD5380_CTRL_INT_VREF_2V5;
398
399 st->vref_reg = devm_regulator_get(dev, "vref");
400 if (!IS_ERR(st->vref_reg)) {
401 ret = regulator_enable(st->vref_reg);
402 if (ret) {
403 dev_err(dev, "Failed to enable vref regulators: %d\n",
404 ret);
405 goto error_free_reg;
406 }
407
408 ret = regulator_get_voltage(st->vref_reg);
409 if (ret < 0)
410 goto error_disable_reg;
411
412 st->vref = ret;
413 } else {
414 st->vref = st->chip_info->int_vref;
415 ctrl |= AD5380_CTRL_INT_VREF_EN;
416 }
417
418 ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);
419 if (ret) {
420 dev_err(dev, "Failed to write to device: %d\n", ret);
421 goto error_disable_reg;
422 }
423
424 ret = iio_device_register(indio_dev);
425 if (ret) {
426 dev_err(dev, "Failed to register iio device: %d\n", ret);
427 goto error_disable_reg;
428 }
429
430 return 0;
431
432error_disable_reg:
433 if (!IS_ERR(st->vref_reg))
434 regulator_disable(st->vref_reg);
435error_free_reg:
436 kfree(indio_dev->channels);
437
438 return ret;
439}
440
441static int ad5380_remove(struct device *dev)
442{
443 struct iio_dev *indio_dev = dev_get_drvdata(dev);
444 struct ad5380_state *st = iio_priv(indio_dev);
445
446 iio_device_unregister(indio_dev);
447
448 kfree(indio_dev->channels);
449
450 if (!IS_ERR(st->vref_reg)) {
451 regulator_disable(st->vref_reg);
452 }
453
454 return 0;
455}
456
457static bool ad5380_reg_false(struct device *dev, unsigned int reg)
458{
459 return false;
460}
461
462static const struct regmap_config ad5380_regmap_config = {
463 .reg_bits = 10,
464 .val_bits = 14,
465
466 .max_register = AD5380_REG_DATA(40),
467 .cache_type = REGCACHE_RBTREE,
468
469 .volatile_reg = ad5380_reg_false,
470 .readable_reg = ad5380_reg_false,
471};
472
473#if IS_ENABLED(CONFIG_SPI_MASTER)
474
475static int ad5380_spi_probe(struct spi_device *spi)
476{
477 const struct spi_device_id *id = spi_get_device_id(spi);
478 struct regmap *regmap;
479
480 regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);
481
482 if (IS_ERR(regmap))
483 return PTR_ERR(regmap);
484
485 return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
486}
487
488static int ad5380_spi_remove(struct spi_device *spi)
489{
490 return ad5380_remove(&spi->dev);
491}
492
493static const struct spi_device_id ad5380_spi_ids[] = {
494 { "ad5380-3", ID_AD5380_3 },
495 { "ad5380-5", ID_AD5380_5 },
496 { "ad5381-3", ID_AD5381_3 },
497 { "ad5381-5", ID_AD5381_5 },
498 { "ad5382-3", ID_AD5382_3 },
499 { "ad5382-5", ID_AD5382_5 },
500 { "ad5383-3", ID_AD5383_3 },
501 { "ad5383-5", ID_AD5383_5 },
502 { "ad5384-3", ID_AD5380_3 },
503 { "ad5384-5", ID_AD5380_5 },
504 { "ad5390-3", ID_AD5390_3 },
505 { "ad5390-5", ID_AD5390_5 },
506 { "ad5391-3", ID_AD5391_3 },
507 { "ad5391-5", ID_AD5391_5 },
508 { "ad5392-3", ID_AD5392_3 },
509 { "ad5392-5", ID_AD5392_5 },
510 { }
511};
512MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);
513
514static struct spi_driver ad5380_spi_driver = {
515 .driver = {
516 .name = "ad5380",
517 .owner = THIS_MODULE,
518 },
519 .probe = ad5380_spi_probe,
520 .remove = ad5380_spi_remove,
521 .id_table = ad5380_spi_ids,
522};
523
524static inline int ad5380_spi_register_driver(void)
525{
526 return spi_register_driver(&ad5380_spi_driver);
527}
528
529static inline void ad5380_spi_unregister_driver(void)
530{
531 spi_unregister_driver(&ad5380_spi_driver);
532}
533
534#else
535
536static inline int ad5380_spi_register_driver(void)
537{
538 return 0;
539}
540
541static inline void ad5380_spi_unregister_driver(void)
542{
543}
544
545#endif
546
547#if IS_ENABLED(CONFIG_I2C)
548
549static int ad5380_i2c_probe(struct i2c_client *i2c,
550 const struct i2c_device_id *id)
551{
552 struct regmap *regmap;
553
554 regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);
555
556 if (IS_ERR(regmap))
557 return PTR_ERR(regmap);
558
559 return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
560}
561
562static int ad5380_i2c_remove(struct i2c_client *i2c)
563{
564 return ad5380_remove(&i2c->dev);
565}
566
567static const struct i2c_device_id ad5380_i2c_ids[] = {
568 { "ad5380-3", ID_AD5380_3 },
569 { "ad5380-5", ID_AD5380_5 },
570 { "ad5381-3", ID_AD5381_3 },
571 { "ad5381-5", ID_AD5381_5 },
572 { "ad5382-3", ID_AD5382_3 },
573 { "ad5382-5", ID_AD5382_5 },
574 { "ad5383-3", ID_AD5383_3 },
575 { "ad5383-5", ID_AD5383_5 },
576 { "ad5384-3", ID_AD5380_3 },
577 { "ad5384-5", ID_AD5380_5 },
578 { "ad5390-3", ID_AD5390_3 },
579 { "ad5390-5", ID_AD5390_5 },
580 { "ad5391-3", ID_AD5391_3 },
581 { "ad5391-5", ID_AD5391_5 },
582 { "ad5392-3", ID_AD5392_3 },
583 { "ad5392-5", ID_AD5392_5 },
584 { }
585};
586MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);
587
588static struct i2c_driver ad5380_i2c_driver = {
589 .driver = {
590 .name = "ad5380",
591 .owner = THIS_MODULE,
592 },
593 .probe = ad5380_i2c_probe,
594 .remove = ad5380_i2c_remove,
595 .id_table = ad5380_i2c_ids,
596};
597
598static inline int ad5380_i2c_register_driver(void)
599{
600 return i2c_add_driver(&ad5380_i2c_driver);
601}
602
603static inline void ad5380_i2c_unregister_driver(void)
604{
605 i2c_del_driver(&ad5380_i2c_driver);
606}
607
608#else
609
610static inline int ad5380_i2c_register_driver(void)
611{
612 return 0;
613}
614
615static inline void ad5380_i2c_unregister_driver(void)
616{
617}
618
619#endif
620
621static int __init ad5380_spi_init(void)
622{
623 int ret;
624
625 ret = ad5380_spi_register_driver();
626 if (ret)
627 return ret;
628
629 ret = ad5380_i2c_register_driver();
630 if (ret) {
631 ad5380_spi_unregister_driver();
632 return ret;
633 }
634
635 return 0;
636}
637module_init(ad5380_spi_init);
638
639static void __exit ad5380_spi_exit(void)
640{
641 ad5380_i2c_unregister_driver();
642 ad5380_spi_unregister_driver();
643
644}
645module_exit(ad5380_spi_exit);
646
647MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
648MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
649MODULE_LICENSE("GPL v2");
650
