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.
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)
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;
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
58 struct regmap *regmap;
59 const struct ad5380_chip_info *chip_info;
60 struct regulator *vref_reg;
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,
94 struct ad5380_state *st = iio_priv(indio_dev);
98 ret = strtobool(buf, &pwr_down);
102 mutex_lock(&indio_dev->mlock);
105 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);
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[] = {
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);
128 ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);
132 mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;
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);
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);
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,
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);
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);
181 case IIO_CHAN_INFO_RAW:
182 case IIO_CHAN_INFO_CALIBSCALE:
183 if (val >= max_val || val < 0)
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)
194 return regmap_write(st->regmap,
195 AD5380_REG_OFFSET(chan->address),
196 val << chan->scan_type.shift);
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 unsigned long scale_uv;
211 case IIO_CHAN_INFO_RAW:
212 case IIO_CHAN_INFO_CALIBSCALE:
213 ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),
217 *val >>= chan->scan_type.shift;
219 case IIO_CHAN_INFO_CALIBBIAS:
220 ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),
224 *val >>= chan->scan_type.shift;
225 val -= (1 << chan->scan_type.realbits) / 2;
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;
239 static const struct iio_info ad5380_info = {
240 .read_raw = ad5380_read_raw,
241 .write_raw = ad5380_write_raw,
242 .driver_module = THIS_MODULE,
245 static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
248 .read = ad5380_read_dac_powerdown,
249 .write = ad5380_write_dac_powerdown,
251 IIO_ENUM("powerdown_mode", true, &ad5380_powerdown_mode_enum),
252 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
256 #define AD5380_CHANNEL(_bits) { \
257 .type = IIO_VOLTAGE, \
260 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
261 IIO_CHAN_INFO_SCALE_SHARED_BIT | \
262 IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT | \
263 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT, \
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[] = {
270 .channel_template = AD5380_CHANNEL(14),
275 .channel_template = AD5380_CHANNEL(14),
280 .channel_template = AD5380_CHANNEL(12),
285 .channel_template = AD5380_CHANNEL(12),
290 .channel_template = AD5380_CHANNEL(14),
295 .channel_template = AD5380_CHANNEL(14),
300 .channel_template = AD5380_CHANNEL(12),
305 .channel_template = AD5380_CHANNEL(12),
310 .channel_template = AD5380_CHANNEL(14),
315 .channel_template = AD5380_CHANNEL(14),
320 .channel_template = AD5380_CHANNEL(12),
325 .channel_template = AD5380_CHANNEL(12),
330 .channel_template = AD5380_CHANNEL(14),
335 .channel_template = AD5380_CHANNEL(14),
341 static int __devinit ad5380_alloc_channels(struct iio_dev *indio_dev)
343 struct ad5380_state *st = iio_priv(indio_dev);
344 struct iio_chan_spec *channels;
347 channels = kcalloc(st->chip_info->num_channels,
348 sizeof(struct iio_chan_spec), GFP_KERNEL);
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;
364 static int __devinit 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;
372 indio_dev = iio_device_alloc(sizeof(*st));
373 if (indio_dev == NULL) {
374 dev_err(dev, "Failed to allocate iio device\n");
379 st = iio_priv(indio_dev);
380 dev_set_drvdata(dev, indio_dev);
382 st->chip_info = &ad5380_chip_info_tbl[type];
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;
391 ret = ad5380_alloc_channels(indio_dev);
393 dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
397 if (st->chip_info->int_vref == 2500000)
398 ctrl |= AD5380_CTRL_INT_VREF_2V5;
400 st->vref_reg = regulator_get(dev, "vref");
401 if (!IS_ERR(st->vref_reg)) {
402 ret = regulator_enable(st->vref_reg);
404 dev_err(dev, "Failed to enable vref regulators: %d\n",
409 st->vref = regulator_get_voltage(st->vref_reg);
411 st->vref = st->chip_info->int_vref;
412 ctrl |= AD5380_CTRL_INT_VREF_EN;
415 ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);
417 dev_err(dev, "Failed to write to device: %d\n", ret);
418 goto error_disable_reg;
421 ret = iio_device_register(indio_dev);
423 dev_err(dev, "Failed to register iio device: %d\n", ret);
424 goto error_disable_reg;
430 if (!IS_ERR(st->vref_reg))
431 regulator_disable(st->vref_reg);
433 if (!IS_ERR(st->vref_reg))
434 regulator_put(st->vref_reg);
436 kfree(indio_dev->channels);
438 iio_device_free(indio_dev);
444 static int __devexit ad5380_remove(struct device *dev)
446 struct iio_dev *indio_dev = dev_get_drvdata(dev);
447 struct ad5380_state *st = iio_priv(indio_dev);
449 iio_device_unregister(indio_dev);
451 kfree(indio_dev->channels);
453 if (!IS_ERR(st->vref_reg)) {
454 regulator_disable(st->vref_reg);
455 regulator_put(st->vref_reg);
458 iio_device_free(indio_dev);
463 static bool ad5380_reg_false(struct device *dev, unsigned int reg)
468 static const struct regmap_config ad5380_regmap_config = {
472 .max_register = AD5380_REG_DATA(40),
473 .cache_type = REGCACHE_RBTREE,
475 .volatile_reg = ad5380_reg_false,
476 .readable_reg = ad5380_reg_false,
479 #if IS_ENABLED(CONFIG_SPI_MASTER)
481 static int __devinit ad5380_spi_probe(struct spi_device *spi)
483 const struct spi_device_id *id = spi_get_device_id(spi);
484 struct regmap *regmap;
486 regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);
489 return PTR_ERR(regmap);
491 return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
494 static int __devexit ad5380_spi_remove(struct spi_device *spi)
496 return ad5380_remove(&spi->dev);
499 static const struct spi_device_id ad5380_spi_ids[] = {
500 { "ad5380-3", ID_AD5380_3 },
501 { "ad5380-5", ID_AD5380_5 },
502 { "ad5381-3", ID_AD5381_3 },
503 { "ad5381-5", ID_AD5381_5 },
504 { "ad5382-3", ID_AD5382_3 },
505 { "ad5382-5", ID_AD5382_5 },
506 { "ad5383-3", ID_AD5383_3 },
507 { "ad5383-5", ID_AD5383_5 },
508 { "ad5384-3", ID_AD5380_3 },
509 { "ad5384-5", ID_AD5380_5 },
510 { "ad5390-3", ID_AD5390_3 },
511 { "ad5390-5", ID_AD5390_5 },
512 { "ad5391-3", ID_AD5391_3 },
513 { "ad5391-5", ID_AD5391_5 },
514 { "ad5392-3", ID_AD5392_3 },
515 { "ad5392-5", ID_AD5392_5 },
518 MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);
520 static struct spi_driver ad5380_spi_driver = {
523 .owner = THIS_MODULE,
525 .probe = ad5380_spi_probe,
526 .remove = __devexit_p(ad5380_spi_remove),
527 .id_table = ad5380_spi_ids,
530 static inline int ad5380_spi_register_driver(void)
532 return spi_register_driver(&ad5380_spi_driver);
535 static inline void ad5380_spi_unregister_driver(void)
537 spi_unregister_driver(&ad5380_spi_driver);
542 static inline int ad5380_spi_register_driver(void)
547 static inline void ad5380_spi_unregister_driver(void)
553 #if IS_ENABLED(CONFIG_I2C)
555 static int __devinit ad5380_i2c_probe(struct i2c_client *i2c,
556 const struct i2c_device_id *id)
558 struct regmap *regmap;
560 regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);
563 return PTR_ERR(regmap);
565 return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
568 static int __devexit ad5380_i2c_remove(struct i2c_client *i2c)
570 return ad5380_remove(&i2c->dev);
573 static const struct i2c_device_id ad5380_i2c_ids[] = {
574 { "ad5380-3", ID_AD5380_3 },
575 { "ad5380-5", ID_AD5380_5 },
576 { "ad5381-3", ID_AD5381_3 },
577 { "ad5381-5", ID_AD5381_5 },
578 { "ad5382-3", ID_AD5382_3 },
579 { "ad5382-5", ID_AD5382_5 },
580 { "ad5383-3", ID_AD5383_3 },
581 { "ad5383-5", ID_AD5383_5 },
582 { "ad5384-3", ID_AD5380_3 },
583 { "ad5384-5", ID_AD5380_5 },
584 { "ad5390-3", ID_AD5390_3 },
585 { "ad5390-5", ID_AD5390_5 },
586 { "ad5391-3", ID_AD5391_3 },
587 { "ad5391-5", ID_AD5391_5 },
588 { "ad5392-3", ID_AD5392_3 },
589 { "ad5392-5", ID_AD5392_5 },
592 MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);
594 static struct i2c_driver ad5380_i2c_driver = {
597 .owner = THIS_MODULE,
599 .probe = ad5380_i2c_probe,
600 .remove = __devexit_p(ad5380_i2c_remove),
601 .id_table = ad5380_i2c_ids,
604 static inline int ad5380_i2c_register_driver(void)
606 return i2c_add_driver(&ad5380_i2c_driver);
609 static inline void ad5380_i2c_unregister_driver(void)
611 i2c_del_driver(&ad5380_i2c_driver);
616 static inline int ad5380_i2c_register_driver(void)
621 static inline void ad5380_i2c_unregister_driver(void)
627 static int __init ad5380_spi_init(void)
631 ret = ad5380_spi_register_driver();
635 ret = ad5380_i2c_register_driver();
637 ad5380_spi_unregister_driver();
643 module_init(ad5380_spi_init);
645 static void __exit ad5380_spi_exit(void)
647 ad5380_i2c_unregister_driver();
648 ad5380_spi_unregister_driver();
651 module_exit(ad5380_spi_exit);
653 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
654 MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
655 MODULE_LICENSE("GPL v2");