drivers/staging/iio/dac/ad5624r_spi.c - kernel/mindspeed - Git at Google

 /*
  * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
  *
  * Copyright 2010-2011 Analog Devices Inc.
  *
  * Licensed under the GPL-2.
  */

 #include <linux/interrupt.h>
 #include <linux/fs.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>

 #include "../iio.h"
 #include "../sysfs.h"
 #include "dac.h"
 #include "ad5624r.h"

 static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
 	[ID_AD5624R3] = {
 		.bits = 12,
 		.int_vref_mv = 1250,
 	},
 	[ID_AD5644R3] = {
 		.bits = 14,
 		.int_vref_mv = 1250,
 	},
 	[ID_AD5664R3] = {
 		.bits = 16,
 		.int_vref_mv = 1250,
 	},
 	[ID_AD5624R5] = {
 		.bits = 12,
 		.int_vref_mv = 2500,
 	},
 	[ID_AD5644R5] = {
 		.bits = 14,
 		.int_vref_mv = 2500,
 	},
 	[ID_AD5664R5] = {
 		.bits = 16,
 		.int_vref_mv = 2500,
 	},
 };

 static int ad5624r_spi_write(struct spi_device *spi,
 			     u8 cmd, u8 addr, u16 val, u8 len)
 {
 	u32 data;
 	u8 msg[3];

 	/*
 	 * The input shift register is 24 bits wide. The first two bits are
 	 * don't care bits. The next three are the command bits, C2 to C0,
 	 * followed by the 3-bit DAC address, A2 to A0, and then the
 	 * 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
 	 * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
 	 * for the AD5664R, AD5644R, and AD5624R, respectively.
 	 */
 	data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
 	msg[0] = data >> 16;
 	msg[1] = data >> 8;
 	msg[2] = data;

 	return spi_write(spi, msg, 3);
 }

 static ssize_t ad5624r_write_dac(struct device *dev,
 				 struct device_attribute *attr,
 				 const char *buf, size_t len)
 {
 	long readin;
 	int ret;
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad5624r_state *st = iio_priv(indio_dev);
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

 	ret = strict_strtol(buf, 10, &readin);
 	if (ret)
 		return ret;

 	ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
 				this_attr->address, readin,
 				st->chip_info->bits);
 	return ret ? ret : len;
 }

 static ssize_t ad5624r_read_powerdown_mode(struct device *dev,
 				      struct device_attribute *attr, char *buf)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad5624r_state *st = iio_priv(indio_dev);

 	char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};

 	return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
 }

 static ssize_t ad5624r_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 ad5624r_state *st = iio_priv(indio_dev);
 	int ret;

 	if (sysfs_streq(buf, "1kohm_to_gnd"))
 		st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
 	else if (sysfs_streq(buf, "100kohm_to_gnd"))
 		st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
 	else if (sysfs_streq(buf, "three_state"))
 		st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE;
 	else
 		ret = -EINVAL;

 	return ret ? ret : len;
 }

 static ssize_t ad5624r_read_dac_powerdown(struct device *dev,
 					   struct device_attribute *attr,
 					   char *buf)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad5624r_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_mask & (1 << this_attr->address)));
 }

 static ssize_t ad5624r_write_dac_powerdown(struct device *dev,
 					    struct device_attribute *attr,
 					    const char *buf, size_t len)
 {
 	long readin;
 	int ret;
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad5624r_state *st = iio_priv(indio_dev);
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

 	ret = strict_strtol(buf, 10, &readin);
 	if (ret)
 		return ret;

 	if (readin == 1)
 		st->pwr_down_mask |= (1 << this_attr->address);
 	else if (!readin)
 		st->pwr_down_mask &= ~(1 << this_attr->address);
 	else
 		ret = -EINVAL;

 	ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
 				(st->pwr_down_mode << 4) |
 				st->pwr_down_mask, 16);

 	return ret ? ret : len;
 }

 static ssize_t ad5624r_show_scale(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct ad5624r_state *st = iio_priv(indio_dev);
 	/* Corresponds to Vref / 2^(bits) */
 	unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;

 	return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
 }
 static IIO_DEVICE_ATTR(out_voltage_scale, S_IRUGO, ad5624r_show_scale, NULL, 0);

 static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
 static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
 static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
 static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);

 static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO |
 			S_IWUSR, ad5624r_read_powerdown_mode,
 			ad5624r_write_powerdown_mode, 0);

 static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
 			"1kohm_to_gnd 100kohm_to_gnd three_state");

 #define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr)		\
 	IIO_DEVICE_ATTR(out_voltage##_num##_powerdown,			\
 			S_IRUGO | S_IWUSR, _show, _store, _addr)

 static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown,
 				   ad5624r_write_dac_powerdown, 0);
 static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
 				   ad5624r_write_dac_powerdown, 1);
 static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
 				   ad5624r_write_dac_powerdown, 2);
 static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
 				   ad5624r_write_dac_powerdown, 3);

 static struct attribute *ad5624r_attributes[] = {
 	&iio_dev_attr_out_voltage0_raw.dev_attr.attr,
 	&iio_dev_attr_out_voltage1_raw.dev_attr.attr,
 	&iio_dev_attr_out_voltage2_raw.dev_attr.attr,
 	&iio_dev_attr_out_voltage3_raw.dev_attr.attr,
 	&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_voltage_powerdown_mode.dev_attr.attr,
 	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
 	&iio_dev_attr_out_voltage_scale.dev_attr.attr,
 	NULL,
 };

 static const struct attribute_group ad5624r_attribute_group = {
 	.attrs = ad5624r_attributes,
 };

 static const struct iio_info ad5624r_info = {
 	.attrs = &ad5624r_attribute_group,
 	.driver_module = THIS_MODULE,
 };

 static int __devinit ad5624r_probe(struct spi_device *spi)
 {
 	struct ad5624r_state *st;
 	struct iio_dev *indio_dev;
 	int ret, voltage_uv = 0;

 	indio_dev = iio_allocate_device(sizeof(*st));
 	if (indio_dev == NULL) {
 		ret = -ENOMEM;
 		goto error_ret;
 	}
 	st = iio_priv(indio_dev);
 	st->reg = regulator_get(&spi->dev, "vcc");
 	if (!IS_ERR(st->reg)) {
 		ret = regulator_enable(st->reg);
 		if (ret)
 			goto error_put_reg;

 		voltage_uv = regulator_get_voltage(st->reg);
 	}

 	spi_set_drvdata(spi, indio_dev);
 	st->chip_info =
 		&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];

 	if (voltage_uv)
 		st->vref_mv = voltage_uv / 1000;
 	else
 		st->vref_mv = st->chip_info->int_vref_mv;

 	st->us = spi;

 	indio_dev->dev.parent = &spi->dev;
 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->info = &ad5624r_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
 				!!voltage_uv, 16);
 	if (ret)
 		goto error_disable_reg;

 	ret = iio_device_register(indio_dev);
 	if (ret)
 		goto error_disable_reg;

 	return 0;

 error_disable_reg:
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
 error_put_reg:
 	if (!IS_ERR(st->reg))
 		regulator_put(st->reg);
 	iio_free_device(indio_dev);
 error_ret:

 	return ret;
 }

 static int __devexit ad5624r_remove(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
 	struct ad5624r_state *st = iio_priv(indio_dev);

 	iio_device_unregister(indio_dev);
 	if (!IS_ERR(st->reg)) {
 		regulator_disable(st->reg);
 		regulator_put(st->reg);
 	}
 	iio_free_device(indio_dev);

 	return 0;
 }

 static const struct spi_device_id ad5624r_id[] = {
 	{"ad5624r3", ID_AD5624R3},
 	{"ad5644r3", ID_AD5644R3},
 	{"ad5664r3", ID_AD5664R3},
 	{"ad5624r5", ID_AD5624R5},
 	{"ad5644r5", ID_AD5644R5},
 	{"ad5664r5", ID_AD5664R5},
 	{}
 };

 static struct spi_driver ad5624r_driver = {
 	.driver = {
 		   .name = "ad5624r",
 		   .owner = THIS_MODULE,
 		   },
 	.probe = ad5624r_probe,
 	.remove = __devexit_p(ad5624r_remove),
 	.id_table = ad5624r_id,
 };

 static __init int ad5624r_spi_init(void)
 {
 	return spi_register_driver(&ad5624r_driver);
 }
 module_init(ad5624r_spi_init);

 static __exit void ad5624r_spi_exit(void)
 {
 	spi_unregister_driver(&ad5624r_driver);
 }
 module_exit(ad5624r_spi_exit);

 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
 MODULE_LICENSE("GPL v2");
	/*
	* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
	*
	* Copyright 2010-2011 Analog Devices Inc.
	*
	* Licensed under the GPL-2.
	*/

	#include <linux/interrupt.h>
	#include <linux/fs.h>
	#include <linux/device.h>
	#include <linux/kernel.h>
	#include <linux/spi/spi.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/regulator/consumer.h>
	#include <linux/module.h>

	#include "../iio.h"
	#include "../sysfs.h"
	#include "dac.h"
	#include "ad5624r.h"

	static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
	[ID_AD5624R3] = {
	.bits = 12,
	.int_vref_mv = 1250,
	},
	[ID_AD5644R3] = {
	.bits = 14,
	.int_vref_mv = 1250,
	},
	[ID_AD5664R3] = {
	.bits = 16,
	.int_vref_mv = 1250,
	},
	[ID_AD5624R5] = {
	.bits = 12,
	.int_vref_mv = 2500,
	},
	[ID_AD5644R5] = {
	.bits = 14,
	.int_vref_mv = 2500,
	},
	[ID_AD5664R5] = {
	.bits = 16,
	.int_vref_mv = 2500,
	},
	};

	static int ad5624r_spi_write(struct spi_device *spi,
	u8 cmd, u8 addr, u16 val, u8 len)
	{
	u32 data;
	u8 msg[3];

	/*
	* The input shift register is 24 bits wide. The first two bits are
	* don't care bits. The next three are the command bits, C2 to C0,
	* followed by the 3-bit DAC address, A2 to A0, and then the
	* 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
	* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
	* for the AD5664R, AD5644R, and AD5624R, respectively.
	*/
	data = (0 << 22) \| (cmd << 19) \| (addr << 16) \| (val << (16 - len));
	msg[0] = data >> 16;
	msg[1] = data >> 8;
	msg[2] = data;

	return spi_write(spi, msg, 3);
	}

	static ssize_t ad5624r_write_dac(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	long readin;
	int ret;
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5624r_state *st = iio_priv(indio_dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	ret = strict_strtol(buf, 10, &readin);
	if (ret)
	return ret;

	ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
	this_attr->address, readin,
	st->chip_info->bits);
	return ret ? ret : len;
	}

	static ssize_t ad5624r_read_powerdown_mode(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5624r_state *st = iio_priv(indio_dev);

	char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};

	return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
	}

	static ssize_t ad5624r_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 ad5624r_state *st = iio_priv(indio_dev);
	int ret;

	if (sysfs_streq(buf, "1kohm_to_gnd"))
	st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
	else if (sysfs_streq(buf, "100kohm_to_gnd"))
	st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
	else if (sysfs_streq(buf, "three_state"))
	st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE;
	else
	ret = -EINVAL;

	return ret ? ret : len;
	}

	static ssize_t ad5624r_read_dac_powerdown(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5624r_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_mask & (1 << this_attr->address)));
	}

	static ssize_t ad5624r_write_dac_powerdown(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	long readin;
	int ret;
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5624r_state *st = iio_priv(indio_dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	ret = strict_strtol(buf, 10, &readin);
	if (ret)
	return ret;

	if (readin == 1)
	st->pwr_down_mask \|= (1 << this_attr->address);
	else if (!readin)
	st->pwr_down_mask &= ~(1 << this_attr->address);
	else
	ret = -EINVAL;

	ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
	(st->pwr_down_mode << 4) \|
	st->pwr_down_mask, 16);

	return ret ? ret : len;
	}

	static ssize_t ad5624r_show_scale(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5624r_state *st = iio_priv(indio_dev);
	/* Corresponds to Vref / 2^(bits) */
	unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;

	return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
	}
	static IIO_DEVICE_ATTR(out_voltage_scale, S_IRUGO, ad5624r_show_scale, NULL, 0);

	static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
	static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
	static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
	static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);

	static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO \|
	S_IWUSR, ad5624r_read_powerdown_mode,
	ad5624r_write_powerdown_mode, 0);

	static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
	"1kohm_to_gnd 100kohm_to_gnd three_state");

	#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
	IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
	S_IRUGO \| S_IWUSR, _show, _store, _addr)

	static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown,
	ad5624r_write_dac_powerdown, 0);
	static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
	ad5624r_write_dac_powerdown, 1);
	static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
	ad5624r_write_dac_powerdown, 2);
	static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
	ad5624r_write_dac_powerdown, 3);

	static struct attribute *ad5624r_attributes[] = {
	&iio_dev_attr_out_voltage0_raw.dev_attr.attr,
	&iio_dev_attr_out_voltage1_raw.dev_attr.attr,
	&iio_dev_attr_out_voltage2_raw.dev_attr.attr,
	&iio_dev_attr_out_voltage3_raw.dev_attr.attr,
	&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_voltage_powerdown_mode.dev_attr.attr,
	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
	&iio_dev_attr_out_voltage_scale.dev_attr.attr,
	NULL,
	};

	static const struct attribute_group ad5624r_attribute_group = {
	.attrs = ad5624r_attributes,
	};

	static const struct iio_info ad5624r_info = {
	.attrs = &ad5624r_attribute_group,
	.driver_module = THIS_MODULE,
	};

	static int __devinit ad5624r_probe(struct spi_device *spi)
	{
	struct ad5624r_state *st;
	struct iio_dev *indio_dev;
	int ret, voltage_uv = 0;

	indio_dev = iio_allocate_device(sizeof(*st));
	if (indio_dev == NULL) {
	ret = -ENOMEM;
	goto error_ret;
	}
	st = iio_priv(indio_dev);
	st->reg = regulator_get(&spi->dev, "vcc");
	if (!IS_ERR(st->reg)) {
	ret = regulator_enable(st->reg);
	if (ret)
	goto error_put_reg;

	voltage_uv = regulator_get_voltage(st->reg);
	}

	spi_set_drvdata(spi, indio_dev);
	st->chip_info =
	&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];

	if (voltage_uv)
	st->vref_mv = voltage_uv / 1000;
	else
	st->vref_mv = st->chip_info->int_vref_mv;

	st->us = spi;

	indio_dev->dev.parent = &spi->dev;
	indio_dev->name = spi_get_device_id(spi)->name;
	indio_dev->info = &ad5624r_info;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
	!!voltage_uv, 16);
	if (ret)
	goto error_disable_reg;

	ret = iio_device_register(indio_dev);
	if (ret)
	goto error_disable_reg;

	return 0;

	error_disable_reg:
	if (!IS_ERR(st->reg))
	regulator_disable(st->reg);
	error_put_reg:
	if (!IS_ERR(st->reg))
	regulator_put(st->reg);
	iio_free_device(indio_dev);
	error_ret:

	return ret;
	}

	static int __devexit ad5624r_remove(struct spi_device *spi)
	{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct ad5624r_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (!IS_ERR(st->reg)) {
	regulator_disable(st->reg);
	regulator_put(st->reg);
	}
	iio_free_device(indio_dev);

	return 0;
	}

	static const struct spi_device_id ad5624r_id[] = {
	{"ad5624r3", ID_AD5624R3},
	{"ad5644r3", ID_AD5644R3},
	{"ad5664r3", ID_AD5664R3},
	{"ad5624r5", ID_AD5624R5},
	{"ad5644r5", ID_AD5644R5},
	{"ad5664r5", ID_AD5664R5},
	{}
	};

	static struct spi_driver ad5624r_driver = {
	.driver = {
	.name = "ad5624r",
	.owner = THIS_MODULE,
	},
	.probe = ad5624r_probe,
	.remove = __devexit_p(ad5624r_remove),
	.id_table = ad5624r_id,
	};

	static __init int ad5624r_spi_init(void)
	{
	return spi_register_driver(&ad5624r_driver);
	}
	module_init(ad5624r_spi_init);

	static __exit void ad5624r_spi_exit(void)
	{
	spi_unregister_driver(&ad5624r_driver);
	}
	module_exit(ad5624r_spi_exit);

	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
	MODULE_LICENSE("GPL v2");