Added: trunk/drivers/staging/iio/meter/ade7753.c (0 => 8445)
--- trunk/drivers/staging/iio/meter/ade7753.c (rev 0)
+++ trunk/drivers/staging/iio/meter/ade7753.c 2010-03-11 10:03:32 UTC (rev 8445)
@@ -0,0 +1,736 @@
+/*
+ * 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/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,
+ .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,
+ .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,
+ .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;
+ 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);
+ dev_err(dev, "device not playing ball -> reset");
+ 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,
+ ®);
+ 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(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_AVAIL_SAMP_FREQ("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.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_available_sampling_frequency.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) {
+#if 0 /* fixme: here we should support */
+ iio_init_work_cont(&st->work_cont_thresh,
+ NULL,
+ ade7753_thresh_handler_bh_no_check,
+ 0,
+ 0,
+ st);
+#endif
+ 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 <[email protected]>");
+MODULE_DESCRIPTION("Analog Devices ADE7753/6 Single-Phase Multifunction Metering IC Driver");
+MODULE_LICENSE("GPL v2");
