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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 = iio_device_alloc(sizeof(*st));
373 if (indio_dev == NULL) {
374 dev_err(dev, "Failed to allocate iio device\n");
375 ret = -ENOMEM;
376 goto error_out;
377 }
378
379 st = iio_priv(indio_dev);
380 dev_set_drvdata(dev, indio_dev);
381
382 st->chip_info = &ad5380_chip_info_tbl[type];
383 st->regmap = regmap;
384
385 indio_dev->dev.parent = dev;
386 indio_dev->name = name;
387 indio_dev->info = &ad5380_info;
388 indio_dev->modes = INDIO_DIRECT_MODE;
389 indio_dev->num_channels = st->chip_info->num_channels;
390
391 ret = ad5380_alloc_channels(indio_dev);
392 if (ret) {
393 dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
394 goto error_free;
395 }
396
397 if (st->chip_info->int_vref == 2500000)
398 ctrl |= AD5380_CTRL_INT_VREF_2V5;
399
400 st->vref_reg = regulator_get(dev, "vref");
401 if (!IS_ERR(st->vref_reg)) {
402 ret = regulator_enable(st->vref_reg);
403 if (ret) {
404 dev_err(dev, "Failed to enable vref regulators: %d\n",
405 ret);
406 goto error_free_reg;
407 }
408
409 ret = regulator_get_voltage(st->vref_reg);
410 if (ret < 0)
411 goto error_disable_reg;
412
413 st->vref = ret;
414 } else {
415 st->vref = st->chip_info->int_vref;
416 ctrl |= AD5380_CTRL_INT_VREF_EN;
417 }
418
419 ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);
420 if (ret) {
421 dev_err(dev, "Failed to write to device: %d\n", ret);
422 goto error_disable_reg;
423 }
424
425 ret = iio_device_register(indio_dev);
426 if (ret) {
427 dev_err(dev, "Failed to register iio device: %d\n", ret);
428 goto error_disable_reg;
429 }
430
431 return 0;
432
433error_disable_reg:
434 if (!IS_ERR(st->vref_reg))
435 regulator_disable(st->vref_reg);
436error_free_reg:
437 if (!IS_ERR(st->vref_reg))
438 regulator_put(st->vref_reg);
439
440 kfree(indio_dev->channels);
441error_free:
442 iio_device_free(indio_dev);
443error_out:
444
445 return ret;
446}
447
448static int ad5380_remove(struct device *dev)
449{
450 struct iio_dev *indio_dev = dev_get_drvdata(dev);
451 struct ad5380_state *st = iio_priv(indio_dev);
452
453 iio_device_unregister(indio_dev);
454
455 kfree(indio_dev->channels);
456
457 if (!IS_ERR(st->vref_reg)) {
458 regulator_disable(st->vref_reg);
459 regulator_put(st->vref_reg);
460 }
461
462 iio_device_free(indio_dev);
463
464 return 0;
465}
466
467static bool ad5380_reg_false(struct device *dev, unsigned int reg)
468{
469 return false;
470}
471
472static const struct regmap_config ad5380_regmap_config = {
473 .reg_bits = 10,
474 .val_bits = 14,
475
476 .max_register = AD5380_REG_DATA(40),
477 .cache_type = REGCACHE_RBTREE,
478
479 .volatile_reg = ad5380_reg_false,
480 .readable_reg = ad5380_reg_false,
481};
482
483#if IS_ENABLED(CONFIG_SPI_MASTER)
484
485static int ad5380_spi_probe(struct spi_device *spi)
486{
487 const struct spi_device_id *id = spi_get_device_id(spi);
488 struct regmap *regmap;
489
490 regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);
491
492 if (IS_ERR(regmap))
493 return PTR_ERR(regmap);
494
495 return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
496}
497
498static int ad5380_spi_remove(struct spi_device *spi)
499{
500 return ad5380_remove(&spi->dev);
501}
502
503static const struct spi_device_id ad5380_spi_ids[] = {
504 { "ad5380-3", ID_AD5380_3 },
505 { "ad5380-5", ID_AD5380_5 },
506 { "ad5381-3", ID_AD5381_3 },
507 { "ad5381-5", ID_AD5381_5 },
508 { "ad5382-3", ID_AD5382_3 },
509 { "ad5382-5", ID_AD5382_5 },
510 { "ad5383-3", ID_AD5383_3 },
511 { "ad5383-5", ID_AD5383_5 },
512 { "ad5384-3", ID_AD5380_3 },
513 { "ad5384-5", ID_AD5380_5 },
514 { "ad5390-3", ID_AD5390_3 },
515 { "ad5390-5", ID_AD5390_5 },
516 { "ad5391-3", ID_AD5391_3 },
517 { "ad5391-5", ID_AD5391_5 },
518 { "ad5392-3", ID_AD5392_3 },
519 { "ad5392-5", ID_AD5392_5 },
520 { }
521};
522MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);
523
524static struct spi_driver ad5380_spi_driver = {
525 .driver = {
526 .name = "ad5380",
527 .owner = THIS_MODULE,
528 },
529 .probe = ad5380_spi_probe,
530 .remove = ad5380_spi_remove,
531 .id_table = ad5380_spi_ids,
532};
533
534static inline int ad5380_spi_register_driver(void)
535{
536 return spi_register_driver(&ad5380_spi_driver);
537}
538
539static inline void ad5380_spi_unregister_driver(void)
540{
541 spi_unregister_driver(&ad5380_spi_driver);
542}
543
544#else
545
546static inline int ad5380_spi_register_driver(void)
547{
548 return 0;
549}
550
551static inline void ad5380_spi_unregister_driver(void)
552{
553}
554
555#endif
556
557#if IS_ENABLED(CONFIG_I2C)
558
559static int ad5380_i2c_probe(struct i2c_client *i2c,
560 const struct i2c_device_id *id)
561{
562 struct regmap *regmap;
563
564 regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);
565
566 if (IS_ERR(regmap))
567 return PTR_ERR(regmap);
568
569 return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
570}
571
572static int ad5380_i2c_remove(struct i2c_client *i2c)
573{
574 return ad5380_remove(&i2c->dev);
575}
576
577static const struct i2c_device_id ad5380_i2c_ids[] = {
578 { "ad5380-3", ID_AD5380_3 },
579 { "ad5380-5", ID_AD5380_5 },
580 { "ad5381-3", ID_AD5381_3 },
581 { "ad5381-5", ID_AD5381_5 },
582 { "ad5382-3", ID_AD5382_3 },
583 { "ad5382-5", ID_AD5382_5 },
584 { "ad5383-3", ID_AD5383_3 },
585 { "ad5383-5", ID_AD5383_5 },
586 { "ad5384-3", ID_AD5380_3 },
587 { "ad5384-5", ID_AD5380_5 },
588 { "ad5390-3", ID_AD5390_3 },
589 { "ad5390-5", ID_AD5390_5 },
590 { "ad5391-3", ID_AD5391_3 },
591 { "ad5391-5", ID_AD5391_5 },
592 { "ad5392-3", ID_AD5392_3 },
593 { "ad5392-5", ID_AD5392_5 },
594 { }
595};
596MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);
597
598static struct i2c_driver ad5380_i2c_driver = {
599 .driver = {
600 .name = "ad5380",
601 .owner = THIS_MODULE,
602 },
603 .probe = ad5380_i2c_probe,
604 .remove = ad5380_i2c_remove,
605 .id_table = ad5380_i2c_ids,
606};
607
608static inline int ad5380_i2c_register_driver(void)
609{
610 return i2c_add_driver(&ad5380_i2c_driver);
611}
612
613static inline void ad5380_i2c_unregister_driver(void)
614{
615 i2c_del_driver(&ad5380_i2c_driver);
616}
617
618#else
619
620static inline int ad5380_i2c_register_driver(void)
621{
622 return 0;
623}
624
625static inline void ad5380_i2c_unregister_driver(void)
626{
627}
628
629#endif
630
631static int __init ad5380_spi_init(void)
632{
633 int ret;
634
635 ret = ad5380_spi_register_driver();
636 if (ret)
637 return ret;
638
639 ret = ad5380_i2c_register_driver();
640 if (ret) {
641 ad5380_spi_unregister_driver();
642 return ret;
643 }
644
645 return 0;
646}
647module_init(ad5380_spi_init);
648
649static void __exit ad5380_spi_exit(void)
650{
651 ad5380_i2c_unregister_driver();
652 ad5380_spi_unregister_driver();
653
654}
655module_exit(ad5380_spi_exit);
656
657MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
658MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
659MODULE_LICENSE("GPL v2");
660