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Commit 09434ef7 authored by Barry Song's avatar Barry Song Committed by Greg Kroah-Hartman
Browse files

staging: iio: meter: new driver for ADE7753/6 devices 



This also kicks off the new meter subsection.

Signed-off-by: default avatarBarry Song <barry.song@analog.com>
Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0152a058

drivers/staging/iio/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -49,7 +49,7 @@ source "drivers/staging/iio/gyro/Kconfig" 
source "drivers/staging/iio/imu/Kconfig"

source "drivers/staging/iio/light/Kconfig"

source "drivers/staging/iio/magnetometer/Kconfig"



source "drivers/staging/iio/meter/Kconfig"

source "drivers/staging/iio/trigger/Kconfig"



endif # IIO

drivers/staging/iio/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -17,5 +17,6 @@ obj-y += dds/ 
obj-y += gyro/

obj-y += imu/

obj-y += light/

obj-y += trigger/

obj-y += magnetometer/

obj-y += meter/

obj-y += trigger/

drivers/staging/iio/meter/Kconfig

0 → 100644
+11 −0
Original line number Diff line number Diff line 
#

# IIO meter drivers configuration

#

comment "Active energy metering IC"



config ADE7753

	tristate "Analog Devices ADE7753/6 Single-Phase Multifunction Metering IC Driver"

	depends on SPI

	help

	  Say yes here to build support for Analog Devices ADE7753 Single-Phase Multifunction

	  Metering IC with di/dt Sensor Interface.

drivers/staging/iio/meter/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
#

# Makefile for metering ic drivers

#



obj-$(CONFIG_ADE7753) += ade7753.o

drivers/staging/iio/meter/ade7753.c

0 → 100644
+730 −0
Original line number Diff line number Diff line 
/*

 * ADE7753 Single-Phase Multifunction Metering IC with di/dt Sensor Interface Driver

 *

 * Copyright 2010 Analog Devices Inc.

 *

 * Licensed under the GPL-2 or later.

 */



#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/gpio.h>

#include <linux/delay.h>

#include <linux/mutex.h>

#include <linux/device.h>

#include <linux/kernel.h>

#include <linux/spi/spi.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/list.h>



#include "../iio.h"

#include "../sysfs.h"

#include "meter.h"

#include "ade7753.h"



int ade7753_spi_write_reg_8(struct device *dev,

		u8 reg_address,

		u8 val)

{

	int ret;

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ade7753_state *st = iio_dev_get_devdata(indio_dev);



	mutex_lock(&st->buf_lock);

	st->tx[0] = ADE7753_WRITE_REG(reg_address);

	st->tx[1] = val;



	ret = spi_write(st->us, st->tx, 2);

	mutex_unlock(&st->buf_lock);



	return ret;

}



static int ade7753_spi_write_reg_16(struct device *dev,

		u8 reg_address,

		u16 value)

{

	int ret;

	struct spi_message msg;

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ade7753_state *st = iio_dev_get_devdata(indio_dev);

	struct spi_transfer xfers[] = {

		{

			.tx_buf = st->tx,

			.bits_per_word = 8,

			.len = 3,

		}

	};



	mutex_lock(&st->buf_lock);

	st->tx[0] = ADE7753_WRITE_REG(reg_address);

	st->tx[1] = (value >> 8) & 0xFF;

	st->tx[2] = value & 0xFF;



	spi_message_init(&msg);

	spi_message_add_tail(xfers, &msg);

	ret = spi_sync(st->us, &msg);

	mutex_unlock(&st->buf_lock);



	return ret;

}



static int ade7753_spi_read_reg_8(struct device *dev,

		u8 reg_address,

		u8 *val)

{

	struct spi_message msg;

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ade7753_state *st = iio_dev_get_devdata(indio_dev);

	int ret;

	struct spi_transfer xfers[] = {

		{

			.tx_buf = st->tx,

			.rx_buf = st->rx,

			.bits_per_word = 8,

			.len = 2,

		},

	};



	mutex_lock(&st->buf_lock);

	st->tx[0] = ADE7753_READ_REG(reg_address);

	st->tx[1] = 0;



	spi_message_init(&msg);

	spi_message_add_tail(xfers, &msg);

	ret = spi_sync(st->us, &msg);

	if (ret) {

		dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",

				reg_address);

		goto error_ret;

	}

	*val = st->rx[1];



error_ret:

	mutex_unlock(&st->buf_lock);

	return ret;

}



static int ade7753_spi_read_reg_16(struct device *dev,

		u8 reg_address,

		u16 *val)

{

	struct spi_message msg;

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ade7753_state *st = iio_dev_get_devdata(indio_dev);

	int ret;

	struct spi_transfer xfers[] = {

		{

			.tx_buf = st->tx,

			.rx_buf = st->rx,

			.bits_per_word = 8,

			.len = 3,

		},

	};



	mutex_lock(&st->buf_lock);

	st->tx[0] = ADE7753_READ_REG(reg_address);

	st->tx[1] = 0;

	st->tx[2] = 0;



	spi_message_init(&msg);

	spi_message_add_tail(xfers, &msg);

	ret = spi_sync(st->us, &msg);

	if (ret) {

		dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",

				reg_address);

		goto error_ret;

	}

	*val = (st->rx[1] << 8) | st->rx[2];



error_ret:

	mutex_unlock(&st->buf_lock);

	return ret;

}



static int ade7753_spi_read_reg_24(struct device *dev,

		u8 reg_address,

		u32 *val)

{

	struct spi_message msg;

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ade7753_state *st = iio_dev_get_devdata(indio_dev);

	int ret;

	struct spi_transfer xfers[] = {

		{

			.tx_buf = st->tx,

			.rx_buf = st->rx,

			.bits_per_word = 8,

			.len = 4,

		},

	};



	mutex_lock(&st->buf_lock);

	st->tx[0] = ADE7753_READ_REG(reg_address);

	st->tx[1] = 0;

	st->tx[2] = 0;

	st->tx[3] = 0;



	spi_message_init(&msg);

	spi_message_add_tail(xfers, &msg);

	ret = spi_sync(st->us, &msg);

	if (ret) {

		dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X",

				reg_address);

		goto error_ret;

	}

	*val = (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];



error_ret:

	mutex_unlock(&st->buf_lock);

	return ret;

}



static ssize_t ade7753_read_8bit(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	int ret;

	u8 val = 0;

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);



	ret = ade7753_spi_read_reg_8(dev, this_attr->address, &val);

	if (ret)

		return ret;



	return sprintf(buf, "%u\n", val);

}



static ssize_t ade7753_read_16bit(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	int ret;

	u16 val = 0;

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);



	ret = ade7753_spi_read_reg_16(dev, this_attr->address, &val);

	if (ret)

		return ret;



	return sprintf(buf, "%u\n", val);

}



static ssize_t ade7753_read_24bit(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	int ret;

	u32 val = 0;

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);



	ret = ade7753_spi_read_reg_24(dev, this_attr->address, &val);

	if (ret)

		return ret;



	return sprintf(buf, "%u\n", val & 0xFFFFFF);

}



static ssize_t ade7753_write_8bit(struct device *dev,

		struct device_attribute *attr,

		const char *buf,

		size_t len)

{

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	int ret;

	long val;



	ret = strict_strtol(buf, 10, &val);

	if (ret)

		goto error_ret;

	ret = ade7753_spi_write_reg_8(dev, this_attr->address, val);



error_ret:

	return ret ? ret : len;

}



static ssize_t ade7753_write_16bit(struct device *dev,

		struct device_attribute *attr,

		const char *buf,

		size_t len)

{

	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);

	int ret;

	long val;



	ret = strict_strtol(buf, 10, &val);

	if (ret)

		goto error_ret;

	ret = ade7753_spi_write_reg_16(dev, this_attr->address, val);



error_ret:

	return ret ? ret : len;

}



static int ade7753_reset(struct device *dev)

{

	int ret;

	u16 val;

	ade7753_spi_read_reg_16(dev,

			ADE7753_MODE,

			&val);

	val |= 1 << 6; /* Software Chip Reset */

	ret = ade7753_spi_write_reg_16(dev,

			ADE7753_MODE,

			val);



	return ret;

}



static ssize_t ade7753_write_reset(struct device *dev,

		struct device_attribute *attr,

		const char *buf, size_t len)

{

	if (len < 1)

		return -1;

	switch (buf[0]) {

	case '1':

	case 'y':

	case 'Y':

		return ade7753_reset(dev);

	}

	return -1;

}



static IIO_DEV_ATTR_AENERGY(ade7753_read_24bit, ADE7753_AENERGY);

static IIO_DEV_ATTR_LAENERGY(ade7753_read_24bit, ADE7753_LAENERGY);

static IIO_DEV_ATTR_VAENERGY(ade7753_read_24bit, ADE7753_VAENERGY);

static IIO_DEV_ATTR_LVAENERGY(ade7753_read_24bit, ADE7753_LVAENERGY);

static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_CFDEN);

static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_CFNUM);

static IIO_DEV_ATTR_CHKSUM(ade7753_read_8bit, ADE7753_CHKSUM);

static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_PHCAL);

static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_APOS);

static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_SAGCYC);

static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_SAGLVL);

static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_LINECYC);

static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_WDIV);

static IIO_DEV_ATTR_IRMS(S_IWUSR | S_IRUGO,

		ade7753_read_24bit,

		NULL,

		ADE7753_IRMS);

static IIO_DEV_ATTR_VRMS(S_IRUGO,

		ade7753_read_24bit,

		NULL,

		ADE7753_VRMS);

static IIO_DEV_ATTR_IRMSOS(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_IRMSOS);

static IIO_DEV_ATTR_VRMSOS(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_VRMSOS);

static IIO_DEV_ATTR_WGAIN(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_WGAIN);

static IIO_DEV_ATTR_VAGAIN(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_VAGAIN);

static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO,

		ade7753_read_16bit,

		ade7753_write_16bit,

		ADE7753_GAIN);

static IIO_DEV_ATTR_IPKLVL(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_IPKLVL);

static IIO_DEV_ATTR_VPKLVL(S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_VPKLVL);

static IIO_DEV_ATTR_IPEAK(S_IRUGO,

		ade7753_read_24bit,

		NULL,

		ADE7753_IPEAK);

static IIO_DEV_ATTR_VPEAK(S_IRUGO,

		ade7753_read_24bit,

		NULL,

		ADE7753_VPEAK);

static IIO_DEV_ATTR_VPERIOD(S_IRUGO,

		ade7753_read_16bit,

		NULL,

		ADE7753_PERIOD);

static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_CH1OS);

static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,

		ade7753_read_8bit,

		ade7753_write_8bit,

		ADE7753_CH2OS);



static int ade7753_set_irq(struct device *dev, bool enable)

{

	int ret;

	u8 irqen;

	ret = ade7753_spi_read_reg_8(dev, ADE7753_IRQEN, &irqen);

	if (ret)

		goto error_ret;



	if (enable)

		irqen |= 1 << 3; /* Enables an interrupt when a data is

				    present in the waveform register */

	else

		irqen &= ~(1 << 3);



	ret = ade7753_spi_write_reg_8(dev, ADE7753_IRQEN, irqen);

	if (ret)

		goto error_ret;



error_ret:

	return ret;

}



/* Power down the device */

int ade7753_stop_device(struct device *dev)

{

	int ret;

	u16 val;

	ade7753_spi_read_reg_16(dev,

			ADE7753_MODE,

			&val);

	val |= 1 << 4;  /* AD converters can be turned off */

	ret = ade7753_spi_write_reg_16(dev,

			ADE7753_MODE,

			val);



	return ret;

}



static int ade7753_initial_setup(struct ade7753_state *st)

{

	int ret;

	struct device *dev = &st->indio_dev->dev;



	/* use low spi speed for init */

	st->us->mode = SPI_MODE_3;

	spi_setup(st->us);



	/* Disable IRQ */

	ret = ade7753_set_irq(dev, false);

	if (ret) {

		dev_err(dev, "disable irq failed");

		goto err_ret;

	}



	ade7753_reset(dev);

	msleep(ADE7753_STARTUP_DELAY);



err_ret:

	return ret;

}



static ssize_t ade7753_read_frequency(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	int ret, len = 0;

	u8 t;

	int sps;

	ret = ade7753_spi_read_reg_8(dev,

			ADE7753_MODE,

			&t);

	if (ret)

		return ret;



	t = (t >> 11) & 0x3;

	sps = 27900 / (1 + t);



	len = sprintf(buf, "%d SPS\n", sps);

	return len;

}



static ssize_t ade7753_write_frequency(struct device *dev,

		struct device_attribute *attr,

		const char *buf,

		size_t len)

{

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

	struct ade7753_state *st = iio_dev_get_devdata(indio_dev);

	unsigned long val;

	int ret;

	u16 reg, t;



	ret = strict_strtol(buf, 10, &val);

	if (ret)

		return ret;



	mutex_lock(&indio_dev->mlock);



	t = (27900 / val);

	if (t > 0)

		t--;



	if (t > 1)

		st->us->max_speed_hz = ADE7753_SPI_SLOW;

	else

		st->us->max_speed_hz = ADE7753_SPI_FAST;



	ret = ade7753_spi_read_reg_16(dev,

			ADE7753_MODE,

			&reg);

	if (ret)

		goto out;



	reg &= ~(3 << 11);

	reg |= t << 11;



	ret = ade7753_spi_write_reg_16(dev,

			ADE7753_MODE,

			reg);



out:

	mutex_unlock(&indio_dev->mlock);



	return ret ? ret : len;

}

static IIO_DEV_ATTR_TEMP_RAW(ade7753_read_8bit);

static IIO_CONST_ATTR(temp_offset, "-25 C");

static IIO_CONST_ATTR(temp_scale, "0.67 C");



static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,

		ade7753_read_frequency,

		ade7753_write_frequency);



static IIO_DEV_ATTR_RESET(ade7753_write_reset);



static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");



static IIO_CONST_ATTR(name, "ade7753");



static struct attribute *ade7753_event_attributes[] = {

	NULL

};



static struct attribute_group ade7753_event_attribute_group = {

	.attrs = ade7753_event_attributes,

};



static struct attribute *ade7753_attributes[] = {

	&iio_dev_attr_temp_raw.dev_attr.attr,

	&iio_const_attr_temp_offset.dev_attr.attr,

	&iio_const_attr_temp_scale.dev_attr.attr,

	&iio_dev_attr_sampling_frequency.dev_attr.attr,

	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

	&iio_dev_attr_reset.dev_attr.attr,

	&iio_const_attr_name.dev_attr.attr,

	&iio_dev_attr_phcal.dev_attr.attr,

	&iio_dev_attr_cfden.dev_attr.attr,

	&iio_dev_attr_aenergy.dev_attr.attr,

	&iio_dev_attr_laenergy.dev_attr.attr,

	&iio_dev_attr_vaenergy.dev_attr.attr,

	&iio_dev_attr_lvaenergy.dev_attr.attr,

	&iio_dev_attr_cfnum.dev_attr.attr,

	&iio_dev_attr_apos.dev_attr.attr,

	&iio_dev_attr_sagcyc.dev_attr.attr,

	&iio_dev_attr_saglvl.dev_attr.attr,

	&iio_dev_attr_linecyc.dev_attr.attr,

	&iio_dev_attr_chksum.dev_attr.attr,

	&iio_dev_attr_pga_gain.dev_attr.attr,

	&iio_dev_attr_wgain.dev_attr.attr,

	&iio_dev_attr_choff_1.dev_attr.attr,

	&iio_dev_attr_choff_2.dev_attr.attr,

	&iio_dev_attr_wdiv.dev_attr.attr,

	&iio_dev_attr_irms.dev_attr.attr,

	&iio_dev_attr_vrms.dev_attr.attr,

	&iio_dev_attr_irmsos.dev_attr.attr,

	&iio_dev_attr_vrmsos.dev_attr.attr,

	&iio_dev_attr_vagain.dev_attr.attr,

	&iio_dev_attr_ipklvl.dev_attr.attr,

	&iio_dev_attr_vpklvl.dev_attr.attr,

	&iio_dev_attr_ipeak.dev_attr.attr,

	&iio_dev_attr_vpeak.dev_attr.attr,

	&iio_dev_attr_vperiod.dev_attr.attr,

	NULL,

};



static const struct attribute_group ade7753_attribute_group = {

	.attrs = ade7753_attributes,

};



static int __devinit ade7753_probe(struct spi_device *spi)

{

	int ret, regdone = 0;

	struct ade7753_state *st = kzalloc(sizeof *st, GFP_KERNEL);

	if (!st) {

		ret =  -ENOMEM;

		goto error_ret;

	}

	/* this is only used for removal purposes */

	spi_set_drvdata(spi, st);



	/* Allocate the comms buffers */

	st->rx = kzalloc(sizeof(*st->rx)*ADE7753_MAX_RX, GFP_KERNEL);

	if (st->rx == NULL) {

		ret = -ENOMEM;

		goto error_free_st;

	}

	st->tx = kzalloc(sizeof(*st->tx)*ADE7753_MAX_TX, GFP_KERNEL);

	if (st->tx == NULL) {

		ret = -ENOMEM;

		goto error_free_rx;

	}

	st->us = spi;

	mutex_init(&st->buf_lock);

	/* setup the industrialio driver allocated elements */

	st->indio_dev = iio_allocate_device();

	if (st->indio_dev == NULL) {

		ret = -ENOMEM;

		goto error_free_tx;

	}



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

	st->indio_dev->num_interrupt_lines = 1;

	st->indio_dev->event_attrs = &ade7753_event_attribute_group;

	st->indio_dev->attrs = &ade7753_attribute_group;

	st->indio_dev->dev_data = (void *)(st);

	st->indio_dev->driver_module = THIS_MODULE;

	st->indio_dev->modes = INDIO_DIRECT_MODE;



	ret = ade7753_configure_ring(st->indio_dev);

	if (ret)

		goto error_free_dev;



	ret = iio_device_register(st->indio_dev);

	if (ret)

		goto error_unreg_ring_funcs;

	regdone = 1;



	ret = ade7753_initialize_ring(st->indio_dev->ring);

	if (ret) {

		printk(KERN_ERR "failed to initialize the ring\n");

		goto error_unreg_ring_funcs;

	}



	if (spi->irq) {

		ret = iio_register_interrupt_line(spi->irq,

				st->indio_dev,

				0,

				IRQF_TRIGGER_FALLING,

				"ade7753");

		if (ret)

			goto error_uninitialize_ring;



		ret = ade7753_probe_trigger(st->indio_dev);

		if (ret)

			goto error_unregister_line;

	}



	/* Get the device into a sane initial state */

	ret = ade7753_initial_setup(st);

	if (ret)

		goto error_remove_trigger;

	return 0;



error_remove_trigger:

	if (st->indio_dev->modes & INDIO_RING_TRIGGERED)

		ade7753_remove_trigger(st->indio_dev);

error_unregister_line:

	if (st->indio_dev->modes & INDIO_RING_TRIGGERED)

		iio_unregister_interrupt_line(st->indio_dev, 0);

error_uninitialize_ring:

	ade7753_uninitialize_ring(st->indio_dev->ring);

error_unreg_ring_funcs:

	ade7753_unconfigure_ring(st->indio_dev);

error_free_dev:

	if (regdone)

		iio_device_unregister(st->indio_dev);

	else

		iio_free_device(st->indio_dev);

error_free_tx:

	kfree(st->tx);

error_free_rx:

	kfree(st->rx);

error_free_st:

	kfree(st);

error_ret:

	return ret;

}



/* fixme, confirm ordering in this function */

static int ade7753_remove(struct spi_device *spi)

{

	int ret;

	struct ade7753_state *st = spi_get_drvdata(spi);

	struct iio_dev *indio_dev = st->indio_dev;



	ret = ade7753_stop_device(&(indio_dev->dev));

	if (ret)

		goto err_ret;



	flush_scheduled_work();



	ade7753_remove_trigger(indio_dev);

	if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0)

		iio_unregister_interrupt_line(indio_dev, 0);



	ade7753_uninitialize_ring(indio_dev->ring);

	ade7753_unconfigure_ring(indio_dev);

	iio_device_unregister(indio_dev);

	kfree(st->tx);

	kfree(st->rx);

	kfree(st);



	return 0;



err_ret:

	return ret;

}



static struct spi_driver ade7753_driver = {

	.driver = {

		.name = "ade7753",

		.owner = THIS_MODULE,

	},

	.probe = ade7753_probe,

	.remove = __devexit_p(ade7753_remove),

};



static __init int ade7753_init(void)

{

	return spi_register_driver(&ade7753_driver);

}

module_init(ade7753_init);



static __exit void ade7753_exit(void)

{

	spi_unregister_driver(&ade7753_driver);

}

module_exit(ade7753_exit);



MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");

MODULE_DESCRIPTION("Analog Devices ADE7753/6 Single-Phase Multifunction Metering IC Driver");

MODULE_LICENSE("GPL v2");