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Commit c03f2c53 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Greg Kroah-Hartman
Browse files

staging:iio:dac: Add AD5380 driver 



This patch adds support for the Analog Devices D5380, AD5381,
AD5382, AD5383, AD5384, AD5390, AD5391, AD5392 multi-channel
Digital to Analog Converters.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarJonathan Cameron <jic23@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 68b14d7e

drivers/staging/iio/dac/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -24,6 +24,19 @@ config AD5360 
	  To compile this driver as module choose M here: the module will be called

	  ad5360.



config AD5380

	tristate "Analog Devices AD5380/81/82/83/84/90/91/92 DAC driver"

	depends on (SPI_MASTER || I2C)

	select REGMAP_I2C if I2C

	select REGMAP_SPI if SPI_MASTER

	help

	  Say yes here to build support for Analog Devices AD5380, AD5381,

	  AD5382, AD5383, AD5384, AD5390, AD5391, AD5392 multi-channel

	  Digital to Analog Converters (DAC).



	  To compile this driver as module choose M here: the module will be called

	  ad5380.



config AD5421

	tristate "Analog Devices AD5421 DAC driver"

	depends on SPI

drivers/staging/iio/dac/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
#



obj-$(CONFIG_AD5360) += ad5360.o

obj-$(CONFIG_AD5380) += ad5380.o

obj-$(CONFIG_AD5421) += ad5421.o

obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o

obj-$(CONFIG_AD5064) += ad5064.o

drivers/staging/iio/dac/ad5380.c

0 → 100644
+676 −0
Original line number Diff line number Diff line 
/*

 * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392

 * multi-channel Digital to Analog Converters driver

 *

 * Copyright 2011 Analog Devices Inc.

 *

 * Licensed under the GPL-2.

 */



#include <linux/device.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/spi/spi.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/regmap.h>

#include <linux/regulator/consumer.h>



#include "../iio.h"

#include "../sysfs.h"

#include "dac.h"





#define AD5380_REG_DATA(x)	(((x) << 2) | 3)

#define AD5380_REG_OFFSET(x)	(((x) << 2) | 2)

#define AD5380_REG_GAIN(x)	(((x) << 2) | 1)

#define AD5380_REG_SF_PWR_DOWN	(8 << 2)

#define AD5380_REG_SF_PWR_UP	(9 << 2)

#define AD5380_REG_SF_CTRL	(12 << 2)



#define AD5380_CTRL_PWR_DOWN_MODE_OFFSET	13

#define AD5380_CTRL_INT_VREF_2V5		BIT(12)

#define AD5380_CTRL_INT_VREF_EN			BIT(10)



/**

 * struct ad5380_chip_info - chip specific information

 * @channel_template:	channel specification template

 * @num_channels:	number of channels

 * @int_vref:		internal vref in uV

*/



struct ad5380_chip_info {

	struct iio_chan_spec	channel_template;

	unsigned int		num_channels;

	unsigned int		int_vref;

};



/**

 * struct ad5380_state - driver instance specific data

 * @regmap:		regmap instance used by the device

 * @chip_info:		chip model specific constants, available modes etc

 * @vref_reg:		vref supply regulator

 * @vref:		actual reference voltage used in uA

 * @pwr_down:		whether the chip is currently in power down mode

 */



struct ad5380_state {

	struct regmap			*regmap;

	const struct ad5380_chip_info	*chip_info;

	struct regulator		*vref_reg;

	int				vref;

	bool				pwr_down;

};



enum ad5380_type {

	ID_AD5380_3,

	ID_AD5380_5,

	ID_AD5381_3,

	ID_AD5381_5,

	ID_AD5382_3,

	ID_AD5382_5,

	ID_AD5383_3,

	ID_AD5383_5,

	ID_AD5390_3,

	ID_AD5390_5,

	ID_AD5391_3,

	ID_AD5391_5,

	ID_AD5392_3,

	ID_AD5392_5,

};



#define AD5380_CHANNEL(_bits) {					\

	.type = IIO_VOLTAGE,					\

	.indexed = 1,						\

	.output = 1,						\

	.info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT |		\

		IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT |		\

		IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,		\

	.scan_type = IIO_ST('u', (_bits), 16, 14 - (_bits))	\

}



static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {

	[ID_AD5380_3] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 40,

		.int_vref = 1250000,

	},

	[ID_AD5380_5] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 40,

		.int_vref = 2500000,

	},

	[ID_AD5381_3] = {

		.channel_template = AD5380_CHANNEL(12),

		.num_channels = 16,

		.int_vref = 1250000,

	},

	[ID_AD5381_5] = {

		.channel_template = AD5380_CHANNEL(12),

		.num_channels = 16,

		.int_vref = 2500000,

	},

	[ID_AD5382_3] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 32,

		.int_vref = 1250000,

	},

	[ID_AD5382_5] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 32,

		.int_vref = 2500000,

	},

	[ID_AD5383_3] = {

		.channel_template = AD5380_CHANNEL(12),

		.num_channels = 32,

		.int_vref = 1250000,

	},

	[ID_AD5383_5] = {

		.channel_template = AD5380_CHANNEL(12),

		.num_channels = 32,

		.int_vref = 2500000,

	},

	[ID_AD5390_3] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 16,

		.int_vref = 1250000,

	},

	[ID_AD5390_5] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 16,

		.int_vref = 2500000,

	},

	[ID_AD5391_3] = {

		.channel_template = AD5380_CHANNEL(12),

		.num_channels = 16,

		.int_vref = 1250000,

	},

	[ID_AD5391_5] = {

		.channel_template = AD5380_CHANNEL(12),

		.num_channels = 16,

		.int_vref = 2500000,

	},

	[ID_AD5392_3] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 8,

		.int_vref = 1250000,

	},

	[ID_AD5392_5] = {

		.channel_template = AD5380_CHANNEL(14),

		.num_channels = 8,

		.int_vref = 2500000,

	},

};



static ssize_t ad5380_read_dac_powerdown(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5380_state *st = iio_priv(indio_dev);



	return sprintf(buf, "%d\n", st->pwr_down);

}



static ssize_t ad5380_write_dac_powerdown(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t len)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5380_state *st = iio_priv(indio_dev);

	bool pwr_down;

	int ret;



	ret = strtobool(buf, &pwr_down);

	if (ret)

		return ret;



	mutex_lock(&indio_dev->mlock);



	if (pwr_down)

		ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);

	else

		ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0);



	st->pwr_down = pwr_down;



	mutex_unlock(&indio_dev->mlock);



	return ret ? ret : len;

}



static IIO_DEVICE_ATTR(out_voltage_powerdown,

			S_IRUGO | S_IWUSR,

			ad5380_read_dac_powerdown,

			ad5380_write_dac_powerdown, 0);



static const char ad5380_powerdown_modes[][15] = {

	[0]	= "100kohm_to_gnd",

	[1]	= "three_state",

};



static ssize_t ad5380_read_powerdown_mode(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5380_state *st = iio_priv(indio_dev);

	unsigned int mode;

	int ret;



	ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);

	if (ret)

		return ret;



	mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;



	return sprintf(buf, "%s\n", ad5380_powerdown_modes[mode]);

}



static ssize_t ad5380_write_powerdown_mode(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t len)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5380_state *st = iio_priv(indio_dev);

	unsigned int i;

	int ret;



	for (i = 0; i < ARRAY_SIZE(ad5380_powerdown_modes); ++i) {

		if (sysfs_streq(buf, ad5380_powerdown_modes[i]))

			break;

	}



	if (i == ARRAY_SIZE(ad5380_powerdown_modes))

		return -EINVAL;



	ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL,

		1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET,

		i << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);



	return ret ? ret : len;

}



static IIO_DEVICE_ATTR(out_voltage_powerdown_mode,

			S_IRUGO | S_IWUSR,

			ad5380_read_powerdown_mode,

			ad5380_write_powerdown_mode, 0);



static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,

			"100kohm_to_gnd three_state");



static struct attribute *ad5380_attributes[] = {

	&iio_dev_attr_out_voltage_powerdown.dev_attr.attr,

	&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,

	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,

	NULL,

};



static const struct attribute_group ad5380_attribute_group = {

	.attrs = ad5380_attributes,

};



static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,

	long info)

{

	switch (info) {

	case 0:

		return AD5380_REG_DATA(chan->address);

	case IIO_CHAN_INFO_CALIBBIAS:

		return AD5380_REG_OFFSET(chan->address);

	case IIO_CHAN_INFO_CALIBSCALE:

		return AD5380_REG_GAIN(chan->address);

	default:

		break;

	}



	return 0;

}



static int ad5380_write_raw(struct iio_dev *indio_dev,

	struct iio_chan_spec const *chan, int val, int val2, long info)

{

	const unsigned int max_val = (1 << chan->scan_type.realbits);

	struct ad5380_state *st = iio_priv(indio_dev);



	switch (info) {

	case 0:

	case IIO_CHAN_INFO_CALIBSCALE:

		if (val >= max_val || val < 0)

			return -EINVAL;



		return regmap_write(st->regmap,

			ad5380_info_to_reg(chan, info),

			val << chan->scan_type.shift);

	case IIO_CHAN_INFO_CALIBBIAS:

		val += (1 << chan->scan_type.realbits) / 2;

		if (val >= max_val || val < 0)

			return -EINVAL;



		return regmap_write(st->regmap,

			AD5380_REG_OFFSET(chan->address),

			val << chan->scan_type.shift);

	default:

		break;

	}

	return -EINVAL;

}



static int ad5380_read_raw(struct iio_dev *indio_dev,

	struct iio_chan_spec const *chan, int *val, int *val2, long info)

{

	struct ad5380_state *st = iio_priv(indio_dev);

	unsigned long scale_uv;

	int ret;



	switch (info) {

	case 0:

	case IIO_CHAN_INFO_CALIBSCALE:

		ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),

					val);

		if (ret)

			return ret;

		*val >>= chan->scan_type.shift;

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_CALIBBIAS:

		ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),

					val);

		if (ret)

			return ret;

		*val >>= chan->scan_type.shift;

		val -= (1 << chan->scan_type.realbits) / 2;

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:

		scale_uv = ((2 * st->vref) >> chan->scan_type.realbits) * 100;

		*val =  scale_uv / 100000;

		*val2 = (scale_uv % 100000) * 10;

		return IIO_VAL_INT_PLUS_MICRO;

	default:

		break;

	}



	return -EINVAL;

}



static const struct iio_info ad5380_info = {

	.read_raw = ad5380_read_raw,

	.write_raw = ad5380_write_raw,

	.attrs = &ad5380_attribute_group,

	.driver_module = THIS_MODULE,

};



static int __devinit ad5380_alloc_channels(struct iio_dev *indio_dev)

{

	struct ad5380_state *st = iio_priv(indio_dev);

	struct iio_chan_spec *channels;

	unsigned int i;



	channels = kcalloc(sizeof(struct iio_chan_spec),

			st->chip_info->num_channels, GFP_KERNEL);



	if (!channels)

		return -ENOMEM;



	for (i = 0; i < st->chip_info->num_channels; ++i) {

		channels[i] = st->chip_info->channel_template;

		channels[i].channel = i;

		channels[i].address = i;

	}



	indio_dev->channels = channels;



	return 0;

}



static int __devinit ad5380_probe(struct device *dev, struct regmap *regmap,

	enum ad5380_type type, const char *name)

{

	struct iio_dev *indio_dev;

	struct ad5380_state *st;

	unsigned int ctrl = 0;

	int ret;



	indio_dev = iio_allocate_device(sizeof(*st));

	if (indio_dev == NULL) {

		dev_err(dev, "Failed to allocate iio device\n");

		ret = -ENOMEM;

		goto error_regmap_exit;

	}



	st = iio_priv(indio_dev);

	dev_set_drvdata(dev, indio_dev);



	st->chip_info = &ad5380_chip_info_tbl[type];

	st->regmap = regmap;



	indio_dev->dev.parent = dev;

	indio_dev->name = name;

	indio_dev->info = &ad5380_info;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->num_channels = st->chip_info->num_channels;



	ret = ad5380_alloc_channels(indio_dev);

	if (ret) {

		dev_err(dev, "Failed to allocate channel spec: %d\n", ret);

		goto error_free;

	}



	if (st->chip_info->int_vref == 2500000)

		ctrl |= AD5380_CTRL_INT_VREF_2V5;



	st->vref_reg = regulator_get(dev, "vref");

	if (!IS_ERR(st->vref_reg)) {

		ret = regulator_enable(st->vref_reg);

		if (ret) {

			dev_err(dev, "Failed to enable vref regulators: %d\n",

				ret);

			goto error_free_reg;

		}



		st->vref = regulator_get_voltage(st->vref_reg);

	} else {

		st->vref = st->chip_info->int_vref;

		ctrl |= AD5380_CTRL_INT_VREF_EN;

	}



	ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);

	if (ret) {

		dev_err(dev, "Failed to write to device: %d\n", ret);

		goto error_disable_reg;

	}



	ret = iio_device_register(indio_dev);

	if (ret) {

		dev_err(dev, "Failed to register iio device: %d\n", ret);

		goto error_disable_reg;

	}



	return 0;



error_disable_reg:

	if (!IS_ERR(st->vref_reg))

		regulator_disable(st->vref_reg);

error_free_reg:

	if (!IS_ERR(st->vref_reg))

		regulator_put(st->vref_reg);



	kfree(indio_dev->channels);

error_free:

	iio_free_device(indio_dev);

error_regmap_exit:

	regmap_exit(regmap);



	return ret;

}



static int __devexit ad5380_remove(struct device *dev)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5380_state *st = iio_priv(indio_dev);



	iio_device_unregister(indio_dev);



	kfree(indio_dev->channels);



	if (!IS_ERR(st->vref_reg)) {

		regulator_disable(st->vref_reg);

		regulator_put(st->vref_reg);

	}



	regmap_exit(st->regmap);

	iio_free_device(indio_dev);



	return 0;

}



static bool ad5380_reg_false(struct device *dev, unsigned int reg)

{

	return false;

}



static const struct regmap_config ad5380_regmap_config = {

	.reg_bits = 10,

	.val_bits = 14,



	.max_register = AD5380_REG_DATA(40),

	.cache_type = REGCACHE_RBTREE,



	.volatile_reg = ad5380_reg_false,

	.readable_reg = ad5380_reg_false,

};



#if IS_ENABLED(CONFIG_SPI_MASTER)



static int __devinit ad5380_spi_probe(struct spi_device *spi)

{

	const struct spi_device_id *id = spi_get_device_id(spi);

	struct regmap *regmap;



	regmap = regmap_init_spi(spi, &ad5380_regmap_config);



	if (IS_ERR(regmap))

		return PTR_ERR(regmap);



	return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);

}



static int __devexit ad5380_spi_remove(struct spi_device *spi)

{

	return ad5380_remove(&spi->dev);

}



static const struct spi_device_id ad5380_spi_ids[] = {

	{ "ad5380-3", ID_AD5380_3 },

	{ "ad5380-5", ID_AD5380_5 },

	{ "ad5381-3", ID_AD5381_3 },

	{ "ad5381-5", ID_AD5381_5 },

	{ "ad5382-3", ID_AD5382_3 },

	{ "ad5382-5", ID_AD5382_5 },

	{ "ad5383-3", ID_AD5383_3 },

	{ "ad5383-5", ID_AD5383_5 },

	{ "ad5384-3", ID_AD5380_3 },

	{ "ad5384-5", ID_AD5380_5 },

	{ "ad5390-3", ID_AD5390_3 },

	{ "ad5390-5", ID_AD5390_5 },

	{ "ad5391-3", ID_AD5391_3 },

	{ "ad5391-5", ID_AD5391_5 },

	{ "ad5392-3", ID_AD5392_3 },

	{ "ad5392-5", ID_AD5392_5 },

	{ }

};

MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);



static struct spi_driver ad5380_spi_driver = {

	.driver = {

		   .name = "ad5380",

		   .owner = THIS_MODULE,

	},

	.probe = ad5380_spi_probe,

	.remove = __devexit_p(ad5380_spi_remove),

	.id_table = ad5380_spi_ids,

};



static inline int ad5380_spi_register_driver(void)

{

	return spi_register_driver(&ad5380_spi_driver);

}



static inline void ad5380_spi_unregister_driver(void)

{

	spi_unregister_driver(&ad5380_spi_driver);

}



#else



static inline int ad5380_spi_register_driver(void)

{

	return 0;

}



static inline void ad5380_spi_unregister_driver(void)

{

}



#endif



#if IS_ENABLED(CONFIG_I2C)



static int __devinit ad5380_i2c_probe(struct i2c_client *i2c,

	const struct i2c_device_id *id)

{

	struct regmap *regmap;



	regmap = regmap_init_i2c(i2c, &ad5380_regmap_config);



	if (IS_ERR(regmap))

		return PTR_ERR(regmap);



	return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);

}



static int __devexit ad5380_i2c_remove(struct i2c_client *i2c)

{

	return ad5380_remove(&i2c->dev);

}



static const struct i2c_device_id ad5380_i2c_ids[] = {

	{ "ad5380-3", ID_AD5380_3 },

	{ "ad5380-5", ID_AD5380_5 },

	{ "ad5381-3", ID_AD5381_3 },

	{ "ad5381-5", ID_AD5381_5 },

	{ "ad5382-3", ID_AD5382_3 },

	{ "ad5382-5", ID_AD5382_5 },

	{ "ad5383-3", ID_AD5383_3 },

	{ "ad5383-5", ID_AD5383_5 },

	{ "ad5384-3", ID_AD5380_3 },

	{ "ad5384-5", ID_AD5380_5 },

	{ "ad5390-3", ID_AD5390_3 },

	{ "ad5390-5", ID_AD5390_5 },

	{ "ad5391-3", ID_AD5391_3 },

	{ "ad5391-5", ID_AD5391_5 },

	{ "ad5392-3", ID_AD5392_3 },

	{ "ad5392-5", ID_AD5392_5 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);



static struct i2c_driver ad5380_i2c_driver = {

	.driver = {

		   .name = "ad5380",

		   .owner = THIS_MODULE,

	},

	.probe = ad5380_i2c_probe,

	.remove = __devexit_p(ad5380_i2c_remove),

	.id_table = ad5380_i2c_ids,

};



static inline int ad5380_i2c_register_driver(void)

{

	return i2c_add_driver(&ad5380_i2c_driver);

}



static inline void ad5380_i2c_unregister_driver(void)

{

	i2c_del_driver(&ad5380_i2c_driver);

}



#else



static inline int ad5380_i2c_register_driver(void)

{

	return 0;

}



static inline void ad5380_i2c_unregister_driver(void)

{

}



#endif



static int __init ad5380_spi_init(void)

{

	int ret;



	ret = ad5380_spi_register_driver();

	if (ret)

		return ret;



	ret = ad5380_i2c_register_driver();

	if (ret) {

		ad5380_spi_unregister_driver();

		return ret;

	}



	return 0;

}

module_init(ad5380_spi_init);



static void __exit ad5380_spi_exit(void)

{

	ad5380_i2c_unregister_driver();

	ad5380_spi_unregister_driver();



}

module_exit(ad5380_spi_exit);



MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");

MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");

MODULE_LICENSE("GPL v2");