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Commit fcf265d6 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Greg Kroah-Hartman
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staging:iio:dac: Add AD5064 driver 



This patch adds support for the Analog Devices AD6064, AD6064-1, AD6044, AD6024
quad channel digital-to-analog converter devices.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent fcde2bf0

drivers/staging/iio/dac/Kconfig

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@@ -3,6 +3,16 @@ 
#

menu "Digital to analog convertors"



config AD5064

	tristate "Analog Devices AD5064/64-1/44/24 DAC driver"

	depends on SPI

	help

	  Say yes here to build support for Analog Devices AD5064, AD5064-1,

	  AD5044, AD5024 Digital to Analog Converter.



	  To compile this driver as a module, choose M here: the

	  module will be called ad5064.



config AD5624R_SPI

	tristate "Analog Devices AD5624/44/64R DAC spi driver"

	depends on SPI

drivers/staging/iio/dac/Makefile

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@@ -3,6 +3,7 @@ 
#



obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o

obj-$(CONFIG_AD5064) += ad5064.o

obj-$(CONFIG_AD5504) += ad5504.o

obj-$(CONFIG_AD5446) += ad5446.o

obj-$(CONFIG_AD5791) += ad5791.o

drivers/staging/iio/dac/ad5064.c

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/*

 * AD5064, AD5064-1, AD5044, AD5024 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/module.h>

#include <linux/kernel.h>

#include <linux/spi/spi.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/regulator/consumer.h>



#include "../iio.h"

#include "../sysfs.h"

#include "dac.h"



#define AD5064_DAC_CHANNELS			4



#define AD5064_ADDR(x)				((x) << 20)

#define AD5064_CMD(x)				((x) << 24)



#define AD5064_ADDR_DAC(chan)			(chan)

#define AD5064_ADDR_ALL_DAC			0xF



#define AD5064_CMD_WRITE_INPUT_N		0x0

#define AD5064_CMD_UPDATE_DAC_N			0x1

#define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL	0x2

#define AD5064_CMD_WRITE_INPUT_N_UPDATE_N	0x3

#define AD5064_CMD_POWERDOWN_DAC		0x4

#define AD5064_CMD_CLEAR			0x5

#define AD5064_CMD_LDAC_MASK			0x6

#define AD5064_CMD_RESET			0x7

#define AD5064_CMD_DAISY_CHAIN_ENABLE		0x8



#define AD5064_LDAC_PWRDN_NONE			0x0

#define AD5064_LDAC_PWRDN_1K			0x1

#define AD5064_LDAC_PWRDN_100K			0x2

#define AD5064_LDAC_PWRDN_3STATE		0x3



/**

 * struct ad5064_chip_info - chip specific information

 * @shared_vref:	whether the vref supply is shared between channels

 * @channel:		channel specification

*/



struct ad5064_chip_info {

	bool shared_vref;

	struct iio_chan_spec channel[AD5064_DAC_CHANNELS];

};



/**

 * struct ad5064_state - driver instance specific data

 * @spi:		spi_device

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

 * @vref_reg:		vref supply regulators

 * @pwr_down:		whether channel is powered down

 * @pwr_down_mode:	channel's current power down mode

 * @dac_cache:		current DAC raw value (chip does not support readback)

 * @data:		spi transfer buffers

 */



struct ad5064_state {

	struct spi_device		*spi;

	const struct ad5064_chip_info	*chip_info;

	struct regulator_bulk_data	vref_reg[AD5064_DAC_CHANNELS];

	bool				pwr_down[AD5064_DAC_CHANNELS];

	u8				pwr_down_mode[AD5064_DAC_CHANNELS];

	unsigned int			dac_cache[AD5064_DAC_CHANNELS];



	/*

	 * DMA (thus cache coherency maintenance) requires the

	 * transfer buffers to live in their own cache lines.

	 */

	__be32 data ____cacheline_aligned;

};



enum ad5064_type {

	ID_AD5024,

	ID_AD5044,

	ID_AD5064,

	ID_AD5064_1,

};



#define AD5064_CHANNEL(chan, bits) {				\

	.type = IIO_VOLTAGE,					\

	.indexed = 1,						\

	.output = 1,						\

	.channel = (chan),					\

	.info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE),	\

	.address = AD5064_ADDR_DAC(chan),			\

	.scan_type = IIO_ST('u', (bits), 16, 20 - (bits))	\

}



static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {

	[ID_AD5024] = {

		.shared_vref = false,

		.channel[0] = AD5064_CHANNEL(0, 12),

		.channel[1] = AD5064_CHANNEL(1, 12),

		.channel[2] = AD5064_CHANNEL(2, 12),

		.channel[3] = AD5064_CHANNEL(3, 12),

	},

	[ID_AD5044] = {

		.shared_vref = false,

		.channel[0] = AD5064_CHANNEL(0, 14),

		.channel[1] = AD5064_CHANNEL(1, 14),

		.channel[2] = AD5064_CHANNEL(2, 14),

		.channel[3] = AD5064_CHANNEL(3, 14),

	},

	[ID_AD5064] = {

		.shared_vref = false,

		.channel[0] = AD5064_CHANNEL(0, 16),

		.channel[1] = AD5064_CHANNEL(1, 16),

		.channel[2] = AD5064_CHANNEL(2, 16),

		.channel[3] = AD5064_CHANNEL(3, 16),

	},

	[ID_AD5064_1] = {

		.shared_vref = true,

		.channel[0] = AD5064_CHANNEL(0, 16),

		.channel[1] = AD5064_CHANNEL(1, 16),

		.channel[2] = AD5064_CHANNEL(2, 16),

		.channel[3] = AD5064_CHANNEL(3, 16),

	},

};



static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,

	unsigned int addr, unsigned int val, unsigned int shift)

{

	val <<= shift;



	st->data = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val);



	return spi_write(st->spi, &st->data, sizeof(st->data));

}



static int ad5064_sync_powerdown_mode(struct ad5064_state *st,

	unsigned int channel)

{

	unsigned int val;

	int ret;



	val = (0x1 << channel);



	if (st->pwr_down[channel])

		val |= st->pwr_down_mode[channel] << 8;



	ret = ad5064_spi_write(st, AD5064_CMD_POWERDOWN_DAC, 0, val, 0);



	return ret;

}



static const char ad5064_powerdown_modes[][15] = {

	[AD5064_LDAC_PWRDN_NONE]	= "",

	[AD5064_LDAC_PWRDN_1K]		= "1kohm_to_gnd",

	[AD5064_LDAC_PWRDN_100K]	= "100kohm_to_gnd",

	[AD5064_LDAC_PWRDN_3STATE]	= "three_state",

};



static ssize_t ad5064_read_powerdown_mode(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5064_state *st = iio_priv(indio_dev);



	return sprintf(buf, "%s\n",

		ad5064_powerdown_modes[st->pwr_down_mode[this_attr->address]]);

}



static ssize_t ad5064_write_powerdown_mode(struct device *dev,

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

{

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5064_state *st = iio_priv(indio_dev);

	unsigned int mode, i;

	int ret;



	mode = 0;



	for (i = 1; i < ARRAY_SIZE(ad5064_powerdown_modes); ++i) {

		if (sysfs_streq(buf, ad5064_powerdown_modes[i])) {

			mode = i;

			break;

		}

	}

	if (mode == 0)

		return  -EINVAL;



	mutex_lock(&indio_dev->mlock);

	st->pwr_down_mode[this_attr->address] = mode;



	ret = ad5064_sync_powerdown_mode(st, this_attr->address);

	mutex_unlock(&indio_dev->mlock);



	return ret ? ret : len;

}



static ssize_t ad5064_read_dac_powerdown(struct device *dev,

					   struct device_attribute *attr,

					   char *buf)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ad5064_state *st = iio_priv(indio_dev);

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);



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

}



static ssize_t ad5064_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 ad5064_state *st = iio_priv(indio_dev);

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	bool pwr_down;

	int ret;



	ret = strtobool(buf, &pwr_down);

	if (ret)

		return ret;



	mutex_lock(&indio_dev->mlock);

	st->pwr_down[this_attr->address] = pwr_down;



	ret = ad5064_sync_powerdown_mode(st, this_attr->address);

	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;

}



static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,

			"1kohm_to_gnd 100kohm_to_gnd three_state");



#define IIO_DEV_ATTR_DAC_POWERDOWN_MODE(_chan) \

	IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown_mode, \

			S_IRUGO | S_IWUSR, \

			ad5064_read_powerdown_mode, \

			ad5064_write_powerdown_mode, _chan);



#define IIO_DEV_ATTR_DAC_POWERDOWN(_chan)				\

	IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown,			\

			S_IRUGO | S_IWUSR,				\

			ad5064_read_dac_powerdown,			\

			ad5064_write_dac_powerdown, _chan)



static IIO_DEV_ATTR_DAC_POWERDOWN(0);

static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0);

static IIO_DEV_ATTR_DAC_POWERDOWN(1);

static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1);

static IIO_DEV_ATTR_DAC_POWERDOWN(2);

static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2);

static IIO_DEV_ATTR_DAC_POWERDOWN(3);

static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3);



static struct attribute *ad5064_attributes[] = {

	&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,

	&iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,

	&iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,

	&iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,

	&iio_dev_attr_out_voltage0_powerdown_mode.dev_attr.attr,

	&iio_dev_attr_out_voltage1_powerdown_mode.dev_attr.attr,

	&iio_dev_attr_out_voltage2_powerdown_mode.dev_attr.attr,

	&iio_dev_attr_out_voltage3_powerdown_mode.dev_attr.attr,

	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,

	NULL,

};



static const struct attribute_group ad5064_attribute_group = {

	.attrs = ad5064_attributes,

};



static int ad5064_read_raw(struct iio_dev *indio_dev,

			   struct iio_chan_spec const *chan,

			   int *val,

			   int *val2,

			   long m)

{

	struct ad5064_state *st = iio_priv(indio_dev);

	unsigned long scale_uv;

	unsigned int vref;



	switch (m) {

	case 0:

		*val = st->dac_cache[chan->channel];

		return IIO_VAL_INT;

	case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):

		vref = st->chip_info->shared_vref ? 0 : chan->channel;

		scale_uv = regulator_get_voltage(st->vref_reg[vref].consumer);

		if (scale_uv < 0)

			return scale_uv;



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

		*val =  scale_uv / 100000;

		*val2 = (scale_uv % 100000) * 10;

		return IIO_VAL_INT_PLUS_MICRO;

	default:

		break;

	}

	return -EINVAL;

}



static int ad5064_write_raw(struct iio_dev *indio_dev,

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

{

	struct ad5064_state *st = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case 0:

		if (val > (1 << chan->scan_type.realbits) || val < 0)

			return -EINVAL;



		mutex_lock(&indio_dev->mlock);

		ret = ad5064_spi_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N,

				chan->address, val, chan->scan_type.shift);

		if (ret == 0)

			st->dac_cache[chan->channel] = val;

		mutex_unlock(&indio_dev->mlock);

		break;

	default:

		ret = -EINVAL;

	}



	return ret;

}



static const struct iio_info ad5064_info = {

	.read_raw = ad5064_read_raw,

	.write_raw = ad5064_write_raw,

	.attrs = &ad5064_attribute_group,

	.driver_module = THIS_MODULE,

};



static inline unsigned int ad5064_num_vref(struct ad5064_state *st)

{

	return st->chip_info->shared_vref ? 1 : AD5064_DAC_CHANNELS;

}



static const char * const ad5064_vref_names[] = {

	"vrefA",

	"vrefB",

	"vrefC",

	"vrefD",

};



static const char * const ad5064_vref_name(struct ad5064_state *st,

	unsigned int vref)

{

	return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref];

}



static int __devinit ad5064_probe(struct spi_device *spi)

{

	enum ad5064_type type = spi_get_device_id(spi)->driver_data;

	struct iio_dev *indio_dev;

	struct ad5064_state *st;

	unsigned int i;

	int ret;



	indio_dev = iio_allocate_device(sizeof(*st));

	if (indio_dev == NULL)

		return  -ENOMEM;



	st = iio_priv(indio_dev);

	spi_set_drvdata(spi, indio_dev);



	st->chip_info = &ad5064_chip_info_tbl[type];

	st->spi = spi;



	for (i = 0; i < ad5064_num_vref(st); ++i)

		st->vref_reg[i].supply = ad5064_vref_name(st, i);



	ret = regulator_bulk_get(&st->spi->dev, ad5064_num_vref(st),

		st->vref_reg);

	if (ret)

		goto error_free;



	ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);

	if (ret)

		goto error_free_reg;



	for (i = 0; i < AD5064_DAC_CHANNELS; ++i) {

		st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;

		st->dac_cache[i] = 0x8000;

	}



	indio_dev->dev.parent = &spi->dev;

	indio_dev->name = spi_get_device_id(spi)->name;

	indio_dev->info = &ad5064_info;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = st->chip_info->channel;

	indio_dev->num_channels = AD5064_DAC_CHANNELS;



	ret = iio_device_register(indio_dev);

	if (ret)

		goto error_disable_reg;



	return 0;



error_disable_reg:

	regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);

error_free_reg:

	regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);

error_free:

	iio_free_device(indio_dev);



	return ret;

}





static int __devexit ad5064_remove(struct spi_device *spi)

{

	struct iio_dev *indio_dev = spi_get_drvdata(spi);

	struct ad5064_state *st = iio_priv(indio_dev);



	iio_device_unregister(indio_dev);



	regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);

	regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);



	iio_free_device(indio_dev);



	return 0;

}



static const struct spi_device_id ad5064_id[] = {

	{"ad5024", ID_AD5024},

	{"ad5044", ID_AD5044},

	{"ad5064", ID_AD5064},

	{"ad5064-1", ID_AD5064_1},

	{}

};

MODULE_DEVICE_TABLE(spi, ad5064_id);



static struct spi_driver ad5064_driver = {

	.driver = {

		   .name = "ad5064",

		   .owner = THIS_MODULE,

	},

	.probe = ad5064_probe,

	.remove = __devexit_p(ad5064_remove),

	.id_table = ad5064_id,

};



static __init int ad5064_spi_init(void)

{

	return spi_register_driver(&ad5064_driver);

}

module_init(ad5064_spi_init);



static __exit void ad5064_spi_exit(void)

{

	spi_unregister_driver(&ad5064_driver);

}

module_exit(ad5064_spi_exit);



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

MODULE_DESCRIPTION("Analog Devices AD5064/64-1/44/24 DAC");

MODULE_LICENSE("GPL v2");