Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / drivers / iio / dac / ad5380.c
bloba59ff0e7b8882139bcbf0e0fd1a55d75670486d1
1 /*
2 * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392
3 * multi-channel Digital to Analog Converters driver
5 * Copyright 2011 Analog Devices Inc.
7 * Licensed under the GPL-2.
8 */
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>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
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)
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)
35 /**
36 * struct ad5380_chip_info - chip specific information
37 * @channel_template: channel specification template
38 * @num_channels: number of channels
39 * @int_vref: internal vref in uV
42 struct ad5380_chip_info {
43 struct iio_chan_spec channel_template;
44 unsigned int num_channels;
45 unsigned int int_vref;
48 /**
49 * struct ad5380_state - driver instance specific data
50 * @regmap: regmap instance used by the device
51 * @chip_info: chip model specific constants, available modes etc
52 * @vref_reg: vref supply regulator
53 * @vref: actual reference voltage used in uA
54 * @pwr_down: whether the chip is currently in power down mode
57 struct 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;
65 enum 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,
82 static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev,
83 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
85 struct ad5380_state *st = iio_priv(indio_dev);
87 return sprintf(buf, "%d\n", st->pwr_down);
90 static 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)
94 struct ad5380_state *st = iio_priv(indio_dev);
95 bool pwr_down;
96 int ret;
98 ret = strtobool(buf, &pwr_down);
99 if (ret)
100 return ret;
102 mutex_lock(&indio_dev->mlock);
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);
109 st->pwr_down = pwr_down;
111 mutex_unlock(&indio_dev->mlock);
113 return ret ? ret : len;
116 static const char * const ad5380_powerdown_modes[] = {
117 "100kohm_to_gnd",
118 "three_state",
121 static int ad5380_get_powerdown_mode(struct iio_dev *indio_dev,
122 const struct iio_chan_spec *chan)
124 struct ad5380_state *st = iio_priv(indio_dev);
125 unsigned int mode;
126 int ret;
128 ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);
129 if (ret)
130 return ret;
132 mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;
134 return mode;
137 static int ad5380_set_powerdown_mode(struct iio_dev *indio_dev,
138 const struct iio_chan_spec *chan, unsigned int mode)
140 struct ad5380_state *st = iio_priv(indio_dev);
141 int ret;
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);
147 return ret;
150 static 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,
157 static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,
158 long info)
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;
171 return 0;
174 static int ad5380_write_raw(struct iio_dev *indio_dev,
175 struct iio_chan_spec const *chan, int val, int val2, long info)
177 const unsigned int max_val = (1 << chan->scan_type.realbits);
178 struct ad5380_state *st = iio_priv(indio_dev);
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;
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;
194 return regmap_write(st->regmap,
195 AD5380_REG_OFFSET(chan->address),
196 val << chan->scan_type.shift);
197 default:
198 break;
200 return -EINVAL;
203 static int ad5380_read_raw(struct iio_dev *indio_dev,
204 struct iio_chan_spec const *chan, int *val, int *val2, long info)
206 struct ad5380_state *st = iio_priv(indio_dev);
207 int ret;
209 switch (info) {
210 case IIO_CHAN_INFO_RAW:
211 case IIO_CHAN_INFO_CALIBSCALE:
212 ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),
213 val);
214 if (ret)
215 return ret;
216 *val >>= chan->scan_type.shift;
217 return IIO_VAL_INT;
218 case IIO_CHAN_INFO_CALIBBIAS:
219 ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),
220 val);
221 if (ret)
222 return ret;
223 *val >>= chan->scan_type.shift;
224 val -= (1 << chan->scan_type.realbits) / 2;
225 return IIO_VAL_INT;
226 case IIO_CHAN_INFO_SCALE:
227 *val = 2 * st->vref;
228 *val2 = chan->scan_type.realbits;
229 return IIO_VAL_FRACTIONAL_LOG2;
230 default:
231 break;
234 return -EINVAL;
237 static const struct iio_info ad5380_info = {
238 .read_raw = ad5380_read_raw,
239 .write_raw = ad5380_write_raw,
240 .driver_module = THIS_MODULE,
243 static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
245 .name = "powerdown",
246 .read = ad5380_read_dac_powerdown,
247 .write = ad5380_write_dac_powerdown,
248 .shared = IIO_SEPARATE,
250 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
251 &ad5380_powerdown_mode_enum),
252 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
253 { },
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, \
268 static 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 = 1250,
274 [ID_AD5380_5] = {
275 .channel_template = AD5380_CHANNEL(14),
276 .num_channels = 40,
277 .int_vref = 2500,
279 [ID_AD5381_3] = {
280 .channel_template = AD5380_CHANNEL(12),
281 .num_channels = 16,
282 .int_vref = 1250,
284 [ID_AD5381_5] = {
285 .channel_template = AD5380_CHANNEL(12),
286 .num_channels = 16,
287 .int_vref = 2500,
289 [ID_AD5382_3] = {
290 .channel_template = AD5380_CHANNEL(14),
291 .num_channels = 32,
292 .int_vref = 1250,
294 [ID_AD5382_5] = {
295 .channel_template = AD5380_CHANNEL(14),
296 .num_channels = 32,
297 .int_vref = 2500,
299 [ID_AD5383_3] = {
300 .channel_template = AD5380_CHANNEL(12),
301 .num_channels = 32,
302 .int_vref = 1250,
304 [ID_AD5383_5] = {
305 .channel_template = AD5380_CHANNEL(12),
306 .num_channels = 32,
307 .int_vref = 2500,
309 [ID_AD5390_3] = {
310 .channel_template = AD5380_CHANNEL(14),
311 .num_channels = 16,
312 .int_vref = 1250,
314 [ID_AD5390_5] = {
315 .channel_template = AD5380_CHANNEL(14),
316 .num_channels = 16,
317 .int_vref = 2500,
319 [ID_AD5391_3] = {
320 .channel_template = AD5380_CHANNEL(12),
321 .num_channels = 16,
322 .int_vref = 1250,
324 [ID_AD5391_5] = {
325 .channel_template = AD5380_CHANNEL(12),
326 .num_channels = 16,
327 .int_vref = 2500,
329 [ID_AD5392_3] = {
330 .channel_template = AD5380_CHANNEL(14),
331 .num_channels = 8,
332 .int_vref = 1250,
334 [ID_AD5392_5] = {
335 .channel_template = AD5380_CHANNEL(14),
336 .num_channels = 8,
337 .int_vref = 2500,
341 static int ad5380_alloc_channels(struct iio_dev *indio_dev)
343 struct ad5380_state *st = iio_priv(indio_dev);
344 struct iio_chan_spec *channels;
345 unsigned int i;
347 channels = kcalloc(st->chip_info->num_channels,
348 sizeof(struct iio_chan_spec), GFP_KERNEL);
350 if (!channels)
351 return -ENOMEM;
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;
359 indio_dev->channels = channels;
361 return 0;
364 static int ad5380_probe(struct device *dev, struct regmap *regmap,
365 enum ad5380_type type, const char *name)
367 struct iio_dev *indio_dev;
368 struct ad5380_state *st;
369 unsigned int ctrl = 0;
370 int ret;
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;
378 st = iio_priv(indio_dev);
379 dev_set_drvdata(dev, indio_dev);
381 st->chip_info = &ad5380_chip_info_tbl[type];
382 st->regmap = regmap;
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;
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;
396 if (st->chip_info->int_vref == 2500)
397 ctrl |= AD5380_CTRL_INT_VREF_2V5;
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;
408 ret = regulator_get_voltage(st->vref_reg);
409 if (ret < 0)
410 goto error_disable_reg;
412 st->vref = ret / 1000;
413 } else {
414 st->vref = st->chip_info->int_vref;
415 ctrl |= AD5380_CTRL_INT_VREF_EN;
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;
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;
430 return 0;
432 error_disable_reg:
433 if (!IS_ERR(st->vref_reg))
434 regulator_disable(st->vref_reg);
435 error_free_reg:
436 kfree(indio_dev->channels);
438 return ret;
441 static int ad5380_remove(struct device *dev)
443 struct iio_dev *indio_dev = dev_get_drvdata(dev);
444 struct ad5380_state *st = iio_priv(indio_dev);
446 iio_device_unregister(indio_dev);
448 kfree(indio_dev->channels);
450 if (!IS_ERR(st->vref_reg)) {
451 regulator_disable(st->vref_reg);
454 return 0;
457 static bool ad5380_reg_false(struct device *dev, unsigned int reg)
459 return false;
462 static const struct regmap_config ad5380_regmap_config = {
463 .reg_bits = 10,
464 .val_bits = 14,
466 .max_register = AD5380_REG_DATA(40),
467 .cache_type = REGCACHE_RBTREE,
469 .volatile_reg = ad5380_reg_false,
470 .readable_reg = ad5380_reg_false,
473 #if IS_ENABLED(CONFIG_SPI_MASTER)
475 static int ad5380_spi_probe(struct spi_device *spi)
477 const struct spi_device_id *id = spi_get_device_id(spi);
478 struct regmap *regmap;
480 regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);
482 if (IS_ERR(regmap))
483 return PTR_ERR(regmap);
485 return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
488 static int ad5380_spi_remove(struct spi_device *spi)
490 return ad5380_remove(&spi->dev);
493 static 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 },
512 MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);
514 static struct spi_driver ad5380_spi_driver = {
515 .driver = {
516 .name = "ad5380",
517 .owner = THIS_MODULE,
519 .probe = ad5380_spi_probe,
520 .remove = ad5380_spi_remove,
521 .id_table = ad5380_spi_ids,
524 static inline int ad5380_spi_register_driver(void)
526 return spi_register_driver(&ad5380_spi_driver);
529 static inline void ad5380_spi_unregister_driver(void)
531 spi_unregister_driver(&ad5380_spi_driver);
534 #else
536 static inline int ad5380_spi_register_driver(void)
538 return 0;
541 static inline void ad5380_spi_unregister_driver(void)
545 #endif
547 #if IS_ENABLED(CONFIG_I2C)
549 static int ad5380_i2c_probe(struct i2c_client *i2c,
550 const struct i2c_device_id *id)
552 struct regmap *regmap;
554 regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);
556 if (IS_ERR(regmap))
557 return PTR_ERR(regmap);
559 return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
562 static int ad5380_i2c_remove(struct i2c_client *i2c)
564 return ad5380_remove(&i2c->dev);
567 static 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 },
586 MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);
588 static struct i2c_driver ad5380_i2c_driver = {
589 .driver = {
590 .name = "ad5380",
591 .owner = THIS_MODULE,
593 .probe = ad5380_i2c_probe,
594 .remove = ad5380_i2c_remove,
595 .id_table = ad5380_i2c_ids,
598 static inline int ad5380_i2c_register_driver(void)
600 return i2c_add_driver(&ad5380_i2c_driver);
603 static inline void ad5380_i2c_unregister_driver(void)
605 i2c_del_driver(&ad5380_i2c_driver);
608 #else
610 static inline int ad5380_i2c_register_driver(void)
612 return 0;
615 static inline void ad5380_i2c_unregister_driver(void)
619 #endif
621 static int __init ad5380_spi_init(void)
623 int ret;
625 ret = ad5380_spi_register_driver();
626 if (ret)
627 return ret;
629 ret = ad5380_i2c_register_driver();
630 if (ret) {
631 ad5380_spi_unregister_driver();
632 return ret;
635 return 0;
637 module_init(ad5380_spi_init);
639 static void __exit ad5380_spi_exit(void)
641 ad5380_i2c_unregister_driver();
642 ad5380_spi_unregister_driver();
645 module_exit(ad5380_spi_exit);
647 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
648 MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
649 MODULE_LICENSE("GPL v2");