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1// SPDX-License-Identifier: GPL-2.02/*3 * AD5686R, AD5685R, AD5684R Digital to analog converters  driver4 *5 * Copyright 2011 Analog Devices Inc.6 */7 8#include <linux/interrupt.h>9#include <linux/fs.h>10#include <linux/device.h>11#include <linux/module.h>12#include <linux/kernel.h>13#include <linux/slab.h>14#include <linux/sysfs.h>15#include <linux/regulator/consumer.h>16 17#include <linux/iio/iio.h>18#include <linux/iio/sysfs.h>19 20#include "ad5686.h"21 22static const char * const ad5686_powerdown_modes[] = {23	"1kohm_to_gnd",24	"100kohm_to_gnd",25	"three_state"26};27 28static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,29				     const struct iio_chan_spec *chan)30{31	struct ad5686_state *st = iio_priv(indio_dev);32 33	return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;34}35 36static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,37				     const struct iio_chan_spec *chan,38				     unsigned int mode)39{40	struct ad5686_state *st = iio_priv(indio_dev);41 42	st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));43	st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));44 45	return 0;46}47 48static const struct iio_enum ad5686_powerdown_mode_enum = {49	.items = ad5686_powerdown_modes,50	.num_items = ARRAY_SIZE(ad5686_powerdown_modes),51	.get = ad5686_get_powerdown_mode,52	.set = ad5686_set_powerdown_mode,53};54 55static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,56		uintptr_t private, const struct iio_chan_spec *chan, char *buf)57{58	struct ad5686_state *st = iio_priv(indio_dev);59 60	return sysfs_emit(buf, "%d\n", !!(st->pwr_down_mask &61				       (0x3 << (chan->channel * 2))));62}63 64static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,65					  uintptr_t private,66					  const struct iio_chan_spec *chan,67					  const char *buf,68					  size_t len)69{70	bool readin;71	int ret;72	struct ad5686_state *st = iio_priv(indio_dev);73	unsigned int val, ref_bit_msk;74	u8 shift, address = 0;75 76	ret = kstrtobool(buf, &readin);77	if (ret)78		return ret;79 80	if (readin)81		st->pwr_down_mask |= (0x3 << (chan->channel * 2));82	else83		st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));84 85	switch (st->chip_info->regmap_type) {86	case AD5310_REGMAP:87		shift = 9;88		ref_bit_msk = AD5310_REF_BIT_MSK;89		break;90	case AD5683_REGMAP:91		shift = 13;92		ref_bit_msk = AD5683_REF_BIT_MSK;93		break;94	case AD5686_REGMAP:95		shift = 0;96		ref_bit_msk = 0;97		/* AD5674R/AD5679R have 16 channels and 2 powerdown registers */98		if (chan->channel > 0x7)99			address = 0x8;100		break;101	case AD5693_REGMAP:102		shift = 13;103		ref_bit_msk = AD5693_REF_BIT_MSK;104		break;105	default:106		return -EINVAL;107	}108 109	val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);110	if (!st->use_internal_vref)111		val |= ref_bit_msk;112 113	ret = st->write(st, AD5686_CMD_POWERDOWN_DAC,114			address, val >> (address * 2));115 116	return ret ? ret : len;117}118 119static int ad5686_read_raw(struct iio_dev *indio_dev,120			   struct iio_chan_spec const *chan,121			   int *val,122			   int *val2,123			   long m)124{125	struct ad5686_state *st = iio_priv(indio_dev);126	int ret;127 128	switch (m) {129	case IIO_CHAN_INFO_RAW:130		mutex_lock(&st->lock);131		ret = st->read(st, chan->address);132		mutex_unlock(&st->lock);133		if (ret < 0)134			return ret;135		*val = (ret >> chan->scan_type.shift) &136			GENMASK(chan->scan_type.realbits - 1, 0);137		return IIO_VAL_INT;138	case IIO_CHAN_INFO_SCALE:139		*val = st->vref_mv;140		*val2 = chan->scan_type.realbits;141		return IIO_VAL_FRACTIONAL_LOG2;142	}143	return -EINVAL;144}145 146static int ad5686_write_raw(struct iio_dev *indio_dev,147			    struct iio_chan_spec const *chan,148			    int val,149			    int val2,150			    long mask)151{152	struct ad5686_state *st = iio_priv(indio_dev);153	int ret;154 155	switch (mask) {156	case IIO_CHAN_INFO_RAW:157		if (val > (1 << chan->scan_type.realbits) || val < 0)158			return -EINVAL;159 160		mutex_lock(&st->lock);161		ret = st->write(st,162				AD5686_CMD_WRITE_INPUT_N_UPDATE_N,163				chan->address,164				val << chan->scan_type.shift);165		mutex_unlock(&st->lock);166		break;167	default:168		ret = -EINVAL;169	}170 171	return ret;172}173 174static const struct iio_info ad5686_info = {175	.read_raw = ad5686_read_raw,176	.write_raw = ad5686_write_raw,177};178 179static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {180	{181		.name = "powerdown",182		.read = ad5686_read_dac_powerdown,183		.write = ad5686_write_dac_powerdown,184		.shared = IIO_SEPARATE,185	},186	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),187	IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5686_powerdown_mode_enum),188	{ },189};190 191#define AD5868_CHANNEL(chan, addr, bits, _shift) {		\192		.type = IIO_VOLTAGE,				\193		.indexed = 1,					\194		.output = 1,					\195		.channel = chan,				\196		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\197		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\198		.address = addr,				\199		.scan_type = {					\200			.sign = 'u',				\201			.realbits = (bits),			\202			.storagebits = 16,			\203			.shift = (_shift),			\204		},						\205		.ext_info = ad5686_ext_info,			\206}207 208#define DECLARE_AD5693_CHANNELS(name, bits, _shift)		\209static const struct iio_chan_spec name[] = {			\210		AD5868_CHANNEL(0, 0, bits, _shift),		\211}212 213#define DECLARE_AD5338_CHANNELS(name, bits, _shift)		\214static const struct iio_chan_spec name[] = {			\215		AD5868_CHANNEL(0, 1, bits, _shift),		\216		AD5868_CHANNEL(1, 8, bits, _shift),		\217}218 219#define DECLARE_AD5686_CHANNELS(name, bits, _shift)		\220static const struct iio_chan_spec name[] = {			\221		AD5868_CHANNEL(0, 1, bits, _shift),		\222		AD5868_CHANNEL(1, 2, bits, _shift),		\223		AD5868_CHANNEL(2, 4, bits, _shift),		\224		AD5868_CHANNEL(3, 8, bits, _shift),		\225}226 227#define DECLARE_AD5676_CHANNELS(name, bits, _shift)		\228static const struct iio_chan_spec name[] = {			\229		AD5868_CHANNEL(0, 0, bits, _shift),		\230		AD5868_CHANNEL(1, 1, bits, _shift),		\231		AD5868_CHANNEL(2, 2, bits, _shift),		\232		AD5868_CHANNEL(3, 3, bits, _shift),		\233		AD5868_CHANNEL(4, 4, bits, _shift),		\234		AD5868_CHANNEL(5, 5, bits, _shift),		\235		AD5868_CHANNEL(6, 6, bits, _shift),		\236		AD5868_CHANNEL(7, 7, bits, _shift),		\237}238 239#define DECLARE_AD5679_CHANNELS(name, bits, _shift)		\240static const struct iio_chan_spec name[] = {			\241		AD5868_CHANNEL(0, 0, bits, _shift),		\242		AD5868_CHANNEL(1, 1, bits, _shift),		\243		AD5868_CHANNEL(2, 2, bits, _shift),		\244		AD5868_CHANNEL(3, 3, bits, _shift),		\245		AD5868_CHANNEL(4, 4, bits, _shift),		\246		AD5868_CHANNEL(5, 5, bits, _shift),		\247		AD5868_CHANNEL(6, 6, bits, _shift),		\248		AD5868_CHANNEL(7, 7, bits, _shift),		\249		AD5868_CHANNEL(8, 8, bits, _shift),		\250		AD5868_CHANNEL(9, 9, bits, _shift),		\251		AD5868_CHANNEL(10, 10, bits, _shift),		\252		AD5868_CHANNEL(11, 11, bits, _shift),		\253		AD5868_CHANNEL(12, 12, bits, _shift),		\254		AD5868_CHANNEL(13, 13, bits, _shift),		\255		AD5868_CHANNEL(14, 14, bits, _shift),		\256		AD5868_CHANNEL(15, 15, bits, _shift),		\257}258 259DECLARE_AD5693_CHANNELS(ad5310r_channels, 10, 2);260DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);261DECLARE_AD5338_CHANNELS(ad5337r_channels, 8, 8);262DECLARE_AD5338_CHANNELS(ad5338r_channels, 10, 6);263DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);264DECLARE_AD5679_CHANNELS(ad5674r_channels, 12, 4);265DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);266DECLARE_AD5679_CHANNELS(ad5679r_channels, 16, 0);267DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);268DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);269DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);270DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);271DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);272DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);273 274static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {275	[ID_AD5310R] = {276		.channels = ad5310r_channels,277		.int_vref_mv = 2500,278		.num_channels = 1,279		.regmap_type = AD5310_REGMAP,280	},281	[ID_AD5311R] = {282		.channels = ad5311r_channels,283		.int_vref_mv = 2500,284		.num_channels = 1,285		.regmap_type = AD5693_REGMAP,286	},287	[ID_AD5337R] = {288		.channels = ad5337r_channels,289		.int_vref_mv = 2500,290		.num_channels = 2,291		.regmap_type = AD5686_REGMAP,292	},293	[ID_AD5338R] = {294		.channels = ad5338r_channels,295		.int_vref_mv = 2500,296		.num_channels = 2,297		.regmap_type = AD5686_REGMAP,298	},299	[ID_AD5671R] = {300		.channels = ad5672_channels,301		.int_vref_mv = 2500,302		.num_channels = 8,303		.regmap_type = AD5686_REGMAP,304	},305	[ID_AD5672R] = {306		.channels = ad5672_channels,307		.int_vref_mv = 2500,308		.num_channels = 8,309		.regmap_type = AD5686_REGMAP,310	},311	[ID_AD5673R] = {312		.channels = ad5674r_channels,313		.int_vref_mv = 2500,314		.num_channels = 16,315		.regmap_type = AD5686_REGMAP,316	},317	[ID_AD5674R] = {318		.channels = ad5674r_channels,319		.int_vref_mv = 2500,320		.num_channels = 16,321		.regmap_type = AD5686_REGMAP,322	},323	[ID_AD5675R] = {324		.channels = ad5676_channels,325		.int_vref_mv = 2500,326		.num_channels = 8,327		.regmap_type = AD5686_REGMAP,328	},329	[ID_AD5676] = {330		.channels = ad5676_channels,331		.num_channels = 8,332		.regmap_type = AD5686_REGMAP,333	},334	[ID_AD5676R] = {335		.channels = ad5676_channels,336		.int_vref_mv = 2500,337		.num_channels = 8,338		.regmap_type = AD5686_REGMAP,339	},340	[ID_AD5677R] = {341		.channels = ad5679r_channels,342		.int_vref_mv = 2500,343		.num_channels = 16,344		.regmap_type = AD5686_REGMAP,345	},346	[ID_AD5679R] = {347		.channels = ad5679r_channels,348		.int_vref_mv = 2500,349		.num_channels = 16,350		.regmap_type = AD5686_REGMAP,351	},352	[ID_AD5681R] = {353		.channels = ad5691r_channels,354		.int_vref_mv = 2500,355		.num_channels = 1,356		.regmap_type = AD5683_REGMAP,357	},358	[ID_AD5682R] = {359		.channels = ad5692r_channels,360		.int_vref_mv = 2500,361		.num_channels = 1,362		.regmap_type = AD5683_REGMAP,363	},364	[ID_AD5683] = {365		.channels = ad5693_channels,366		.num_channels = 1,367		.regmap_type = AD5683_REGMAP,368	},369	[ID_AD5683R] = {370		.channels = ad5693_channels,371		.int_vref_mv = 2500,372		.num_channels = 1,373		.regmap_type = AD5683_REGMAP,374	},375	[ID_AD5684] = {376		.channels = ad5684_channels,377		.num_channels = 4,378		.regmap_type = AD5686_REGMAP,379	},380	[ID_AD5684R] = {381		.channels = ad5684_channels,382		.int_vref_mv = 2500,383		.num_channels = 4,384		.regmap_type = AD5686_REGMAP,385	},386	[ID_AD5685R] = {387		.channels = ad5685r_channels,388		.int_vref_mv = 2500,389		.num_channels = 4,390		.regmap_type = AD5686_REGMAP,391	},392	[ID_AD5686] = {393		.channels = ad5686_channels,394		.num_channels = 4,395		.regmap_type = AD5686_REGMAP,396	},397	[ID_AD5686R] = {398		.channels = ad5686_channels,399		.int_vref_mv = 2500,400		.num_channels = 4,401		.regmap_type = AD5686_REGMAP,402	},403	[ID_AD5691R] = {404		.channels = ad5691r_channels,405		.int_vref_mv = 2500,406		.num_channels = 1,407		.regmap_type = AD5693_REGMAP,408	},409	[ID_AD5692R] = {410		.channels = ad5692r_channels,411		.int_vref_mv = 2500,412		.num_channels = 1,413		.regmap_type = AD5693_REGMAP,414	},415	[ID_AD5693] = {416		.channels = ad5693_channels,417		.num_channels = 1,418		.regmap_type = AD5693_REGMAP,419	},420	[ID_AD5693R] = {421		.channels = ad5693_channels,422		.int_vref_mv = 2500,423		.num_channels = 1,424		.regmap_type = AD5693_REGMAP,425	},426	[ID_AD5694] = {427		.channels = ad5684_channels,428		.num_channels = 4,429		.regmap_type = AD5686_REGMAP,430	},431	[ID_AD5694R] = {432		.channels = ad5684_channels,433		.int_vref_mv = 2500,434		.num_channels = 4,435		.regmap_type = AD5686_REGMAP,436	},437	[ID_AD5696] = {438		.channels = ad5686_channels,439		.num_channels = 4,440		.regmap_type = AD5686_REGMAP,441	},442	[ID_AD5696R] = {443		.channels = ad5686_channels,444		.int_vref_mv = 2500,445		.num_channels = 4,446		.regmap_type = AD5686_REGMAP,447	},448};449 450int ad5686_probe(struct device *dev,451		 enum ad5686_supported_device_ids chip_type,452		 const char *name, ad5686_write_func write,453		 ad5686_read_func read)454{455	struct ad5686_state *st;456	struct iio_dev *indio_dev;457	unsigned int val, ref_bit_msk;458	u8 cmd;459	int ret, i, voltage_uv = 0;460 461	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));462	if (indio_dev == NULL)463		return  -ENOMEM;464 465	st = iio_priv(indio_dev);466	dev_set_drvdata(dev, indio_dev);467 468	st->dev = dev;469	st->write = write;470	st->read = read;471 472	st->reg = devm_regulator_get_optional(dev, "vcc");473	if (!IS_ERR(st->reg)) {474		ret = regulator_enable(st->reg);475		if (ret)476			return ret;477 478		ret = regulator_get_voltage(st->reg);479		if (ret < 0)480			goto error_disable_reg;481 482		voltage_uv = ret;483	}484 485	st->chip_info = &ad5686_chip_info_tbl[chip_type];486 487	if (voltage_uv)488		st->vref_mv = voltage_uv / 1000;489	else490		st->vref_mv = st->chip_info->int_vref_mv;491 492	/* Set all the power down mode for all channels to 1K pulldown */493	for (i = 0; i < st->chip_info->num_channels; i++)494		st->pwr_down_mode |= (0x01 << (i * 2));495 496	indio_dev->name = name;497	indio_dev->info = &ad5686_info;498	indio_dev->modes = INDIO_DIRECT_MODE;499	indio_dev->channels = st->chip_info->channels;500	indio_dev->num_channels = st->chip_info->num_channels;501 502	mutex_init(&st->lock);503 504	switch (st->chip_info->regmap_type) {505	case AD5310_REGMAP:506		cmd = AD5686_CMD_CONTROL_REG;507		ref_bit_msk = AD5310_REF_BIT_MSK;508		st->use_internal_vref = !voltage_uv;509		break;510	case AD5683_REGMAP:511		cmd = AD5686_CMD_CONTROL_REG;512		ref_bit_msk = AD5683_REF_BIT_MSK;513		st->use_internal_vref = !voltage_uv;514		break;515	case AD5686_REGMAP:516		cmd = AD5686_CMD_INTERNAL_REFER_SETUP;517		ref_bit_msk = 0;518		break;519	case AD5693_REGMAP:520		cmd = AD5686_CMD_CONTROL_REG;521		ref_bit_msk = AD5693_REF_BIT_MSK;522		st->use_internal_vref = !voltage_uv;523		break;524	default:525		ret = -EINVAL;526		goto error_disable_reg;527	}528 529	val = (voltage_uv | ref_bit_msk);530 531	ret = st->write(st, cmd, 0, !!val);532	if (ret)533		goto error_disable_reg;534 535	ret = iio_device_register(indio_dev);536	if (ret)537		goto error_disable_reg;538 539	return 0;540 541error_disable_reg:542	if (!IS_ERR(st->reg))543		regulator_disable(st->reg);544	return ret;545}546EXPORT_SYMBOL_NS_GPL(ad5686_probe, IIO_AD5686);547 548void ad5686_remove(struct device *dev)549{550	struct iio_dev *indio_dev = dev_get_drvdata(dev);551	struct ad5686_state *st = iio_priv(indio_dev);552 553	iio_device_unregister(indio_dev);554	if (!IS_ERR(st->reg))555		regulator_disable(st->reg);556}557EXPORT_SYMBOL_NS_GPL(ad5686_remove, IIO_AD5686);558 559MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");560MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");561MODULE_LICENSE("GPL v2");562