staging:iio:meter:ade7758: Use iio channel spec and miscellaneous other changes. (8a27a023) · Commits · 戴 / test

drivers/staging/iio/meter/ade7758.h

+45 −21

Original line number	Diff line number	Diff line
		/*
		* ADE7758 Poly Phase Multifunction Energy Metering IC driver
		*
		* Copyright 2010-2011 Analog Devices Inc.
		*
		* Licensed under the GPL-2.
		*/

		#ifndef _ADE7758_H
		#define _ADE7758_H

		@@ -83,12 +91,23 @@
		#define ADE7758_MAX_RX 4
		#define ADE7758_STARTUP_DELAY 1

		#define ADE7758_SPI_SLOW (u32)(300 * 1000)
		#define ADE7758_SPI_BURST (u32)(1000 * 1000)
		#define ADE7758_SPI_FAST (u32)(2000 * 1000)
		#define AD7758_NUM_WAVSEL 5
		#define AD7758_NUM_PHSEL 3
		#define AD7758_NUM_WAVESRC (AD7758_NUM_WAVSEL * AD7758_NUM_PHSEL)

		#define AD7758_PHASE_A 0
		#define AD7758_PHASE_B 1
		#define AD7758_PHASE_C 2
		#define AD7758_CURRENT 0
		#define AD7758_VOLTAGE 1
		#define AD7758_ACT_PWR 2
		#define AD7758_REACT_PWR 3
		#define AD7758_APP_PWR 4
		#define AD7758_WT(p, w) (((w) << 2) \| (p))

		#define DRIVER_NAME "ade7758"


		/**
		* struct ade7758_state - device instance specific data
		* @us: actual spi_device
		@@ -105,16 +124,23 @@ struct ade7758_state {
		u8 *tx;
		u8 *rx;
		struct mutex buf_lock;
		u32 available_scan_masks[AD7758_NUM_WAVESRC];
		struct iio_chan_spec *ade7758_ring_channels;
		struct spi_transfer ring_xfer[4];
		struct spi_message ring_msg;
		/*
		* DMA (thus cache coherency maintenance) requires the
		* transfer buffers to live in their own cache lines.
		*/
		unsigned char rx_buf[8] ____cacheline_aligned;
		unsigned char tx_buf[8];

		};
		#ifdef CONFIG_IIO_RING_BUFFER
		/* At the moment triggers are only used for ring buffer
		* filling. This may change!
		*/

		enum ade7758_scan {
		ADE7758_SCAN_WFORM,
		};

		void ade7758_remove_trigger(struct iio_dev *indio_dev);
		int ade7758_probe_trigger(struct iio_dev *indio_dev);

		@@ -129,6 +155,12 @@ void ade7758_unconfigure_ring(struct iio_dev *indio_dev);
		int ade7758_initialize_ring(struct iio_ring_buffer *ring);
		void ade7758_uninitialize_ring(struct iio_ring_buffer *ring);
		int ade7758_set_irq(struct device *dev, bool enable);

		int ade7758_spi_write_reg_8(struct device *dev,
		u8 reg_address, u8 val);
		int ade7758_spi_read_reg_8(struct device *dev,
		u8 reg_address, u8 *val);

		#else /* CONFIG_IIO_RING_BUFFER */

		static inline void ade7758_remove_trigger(struct iio_dev *indio_dev)
		@@ -139,14 +171,6 @@ static inline int ade7758_probe_trigger(struct iio_dev *indio_dev)
		return 0;
		}

		static inline ssize_t
		ade7758_read_data_from_ring(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		return 0;
		}

		static int ade7758_configure_ring(struct iio_dev *indio_dev)
		{
		return 0;

drivers/staging/iio/meter/ade7758_core.c

+89 −84

Original line number	Diff line number	Diff line
		@@ -20,10 +20,11 @@

		#include "../iio.h"
		#include "../sysfs.h"
		#include "../ring_generic.h"
		#include "meter.h"
		#include "ade7758.h"

		static int ade7758_spi_write_reg_8(struct device *dev,
		int ade7758_spi_write_reg_8(struct device *dev,
		u8 reg_address,
		u8 val)
		{
		@@ -490,7 +491,7 @@ static int ade7758_initial_setup(struct ade7758_state *st)
		struct device *dev = &st->indio_dev->dev;

		/* use low spi speed for init */
		st->us->mode = SPI_MODE_3;
		st->us->mode = SPI_MODE_1;
		spi_setup(st->us);

		/* Disable IRQ */
		@@ -580,63 +581,6 @@ out:
		return ret ? ret : len;
		}

		static ssize_t ade7758_read_waveform_type(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		int ret, len = 0;
		u8 t;
		ret = ade7758_spi_read_reg_8(dev,
		ADE7758_WAVMODE,
		&t);
		if (ret)
		return ret;

		t = (t >> 2) & 0x7;

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

		return len;
		}

		static ssize_t ade7758_write_waveform_type(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t len)
		{
		struct iio_dev *indio_dev = dev_get_drvdata(dev);
		unsigned long val;
		int ret;
		u8 reg;

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

		if (val > 4)
		return -EINVAL;

		mutex_lock(&indio_dev->mlock);

		ret = ade7758_spi_read_reg_8(dev,
		ADE7758_WAVMODE,
		&reg);
		if (ret)
		goto out;

		reg &= ~(7 << 2);
		reg \|= val << 2;

		ret = ade7758_spi_write_reg_8(dev,
		ADE7758_WAVMODE,
		reg);

		out:
		mutex_unlock(&indio_dev->mlock);

		return ret ? ret : len;
		}

		static IIO_DEV_ATTR_TEMP_RAW(ade7758_read_8bit);
		static IIO_CONST_ATTR(temp_offset, "129 C");
		static IIO_CONST_ATTR(temp_scale, "4 C");
		@@ -664,19 +608,6 @@ static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR \| S_IRUGO,
		ade7758_read_frequency,
		ade7758_write_frequency);

		/**
		* IIO_DEV_ATTR_WAVEFORM_TYPE - set the type of waveform.
		* @_mode: sysfs file mode/permissions
		* @_show: output method for the attribute
		* @_store: input method for the attribute
		**/
		#define IIO_DEV_ATTR_WAVEFORM_TYPE(_mode, _show, _store) \
		IIO_DEVICE_ATTR(waveform_type, _mode, _show, _store, 0)

		static IIO_DEV_ATTR_WAVEFORM_TYPE(S_IWUSR \| S_IRUGO,
		ade7758_read_waveform_type,
		ade7758_write_waveform_type);

		static IIO_DEV_ATTR_RESET(ade7758_write_reset);

		static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("26040 13020 6510 3255");
		@@ -686,7 +617,6 @@ static struct attribute *ade7758_attributes[] = {
		&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_dev_attr_waveform_type.dev_attr.attr,
		&iio_const_attr_sampling_frequency_available.dev_attr.attr,
		&iio_dev_attr_reset.dev_attr.attr,
		&iio_dev_attr_awatthr.dev_attr.attr,
		@@ -730,11 +660,73 @@ static const struct attribute_group ade7758_attribute_group = {
		.attrs = ade7758_attributes,
		};


		static struct iio_chan_spec ade7758_channels[] = {
		IIO_CHAN(IIO_IN, 0, 1, 0, "raw", 0, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_A, AD7758_VOLTAGE),
		0, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_CURRENT, 0, 1, 0, "raw", 0, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_A, AD7758_CURRENT),
		1, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "apparent_raw", 0, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_A, AD7758_APP_PWR),
		2, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "active_raw", 0, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_A, AD7758_ACT_PWR),
		3, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "reactive_raw", 0, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_A, AD7758_REACT_PWR),
		4, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_IN, 0, 1, 0, "raw", 1, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_B, AD7758_VOLTAGE),
		5, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_CURRENT, 0, 1, 0, "raw", 1, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_B, AD7758_CURRENT),
		6, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "apparent_raw", 1, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_B, AD7758_APP_PWR),
		7, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "active_raw", 1, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_B, AD7758_ACT_PWR),
		8, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "reactive_raw", 1, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_B, AD7758_REACT_PWR),
		9, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_IN, 0, 1, 0, "raw", 2, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_C, AD7758_VOLTAGE),
		10, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_CURRENT, 0, 1, 0, "raw", 2, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_C, AD7758_CURRENT),
		11, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "apparent_raw", 2, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_C, AD7758_APP_PWR),
		12, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "active_raw", 2, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_C, AD7758_ACT_PWR),
		13, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN(IIO_POWER, 0, 1, 0, "reactive_raw", 2, 0,
		(1 << IIO_CHAN_INFO_SCALE_SHARED),
		AD7758_WT(AD7758_PHASE_C, AD7758_REACT_PWR),
		14, IIO_ST('s', 24, 32, 0), 0),
		IIO_CHAN_SOFT_TIMESTAMP(15),
		};

		static int __devinit ade7758_probe(struct spi_device *spi)
		{
		int ret, regdone = 0;
		int i, ret, regdone = 0;
		struct ade7758_state st = kzalloc(sizeof st, GFP_KERNEL);
		if (!st) {
		ret = -ENOMEM;
		@@ -755,6 +747,7 @@ static int __devinit ade7758_probe(struct spi_device *spi)
		goto error_free_rx;
		}
		st->us = spi;
		st->ade7758_ring_channels = &ade7758_channels[0];
		mutex_init(&st->buf_lock);
		/* setup the industrialio driver allocated elements */
		st->indio_dev = iio_allocate_device(0);
		@@ -770,6 +763,11 @@ static int __devinit ade7758_probe(struct spi_device *spi)
		st->indio_dev->driver_module = THIS_MODULE;
		st->indio_dev->modes = INDIO_DIRECT_MODE;

		for (i = 0; i < AD7758_NUM_WAVESRC; i++)
		st->available_scan_masks[i] = 1 << i;

		st->indio_dev->available_scan_masks = st->available_scan_masks;

		ret = ade7758_configure_ring(st->indio_dev);
		if (ret)
		goto error_free_dev;
		@@ -779,22 +777,25 @@ static int __devinit ade7758_probe(struct spi_device *spi)
		goto error_unreg_ring_funcs;
		regdone = 1;

		ret = ade7758_initialize_ring(st->indio_dev->ring);
		ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
		&ade7758_channels[0],
		ARRAY_SIZE(ade7758_channels));
		if (ret) {
		printk(KERN_ERR "failed to initialize the ring\n");
		dev_err(&spi->dev, "failed to initialize the ring\n");
		goto error_unreg_ring_funcs;
		}

		if (spi->irq) {
		ret = ade7758_probe_trigger(st->indio_dev);
		/* Get the device into a sane initial state */
		ret = ade7758_initial_setup(st);
		if (ret)
		goto error_uninitialize_ring;
		}

		/* Get the device into a sane initial state */
		ret = ade7758_initial_setup(st);
		if (spi->irq) {
		ret = ade7758_probe_trigger(st->indio_dev);
		if (ret)
		goto error_remove_trigger;
		}

		return 0;

		error_remove_trigger:
		@@ -829,8 +830,6 @@ static int ade7758_remove(struct spi_device *spi)
		if (ret)
		goto err_ret;

		flush_scheduled_work();

		ade7758_remove_trigger(indio_dev);
		ade7758_uninitialize_ring(indio_dev->ring);
		iio_device_unregister(indio_dev);
		@@ -845,6 +844,11 @@ err_ret:
		return ret;
		}

		static const struct spi_device_id ade7758_id[] = {
		{"ade7758", 0},
		{}
		};

		static struct spi_driver ade7758_driver = {
		.driver = {
		.name = "ade7758",
		@@ -852,6 +856,7 @@ static struct spi_driver ade7758_driver = {
		},
		.probe = ade7758_probe,
		.remove = __devexit_p(ade7758_remove),
		.id_table = ade7758_id,
		};

		static __init int ade7758_init(void)

drivers/staging/iio/meter/ade7758_ring.c

+124 −107

Original line number	Diff line number	Diff line
		/*
		* ADE7758 Poly Phase Multifunction Energy Metering IC driver
		*
		* Copyright 2010-2011 Analog Devices Inc.
		*
		* Licensed under the GPL-2.
		*/
		#include <linux/interrupt.h>
		#include <linux/irq.h>
		#include <linux/gpio.h>
		@@ -9,6 +16,7 @@
		#include <linux/slab.h>
		#include <linux/sysfs.h>
		#include <linux/list.h>
		#include <asm/unaligned.h>

		#include "../iio.h"
		#include "../sysfs.h"
		@@ -18,82 +26,40 @@
		#include "ade7758.h"

		/**
		* combine_8_to_32() utility function to munge to u8s into u32
		**/
		static inline u32 combine_8_to_32(u8 lower, u8 mid, u8 upper)
		{
		u32 _lower = lower;
		u32 _mid = mid;
		u32 _upper = upper;

		return _lower \| (_mid << 8) \| (_upper << 16);
		}

		static IIO_SCAN_EL_C(wform, ADE7758_SCAN_WFORM, ADE7758_WFORM, NULL);
		static IIO_CONST_ATTR_SCAN_EL_TYPE(wform, s, 24, 32);
		static IIO_SCAN_EL_TIMESTAMP(1);
		static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);

		static struct attribute *ade7758_scan_el_attrs[] = {
		&iio_scan_el_wform.dev_attr.attr,
		&iio_const_attr_wform_index.dev_attr.attr,
		&iio_const_attr_wform_type.dev_attr.attr,
		&iio_scan_el_timestamp.dev_attr.attr,
		&iio_const_attr_timestamp_index.dev_attr.attr,
		&iio_const_attr_timestamp_type.dev_attr.attr,
		NULL,
		};

		static struct attribute_group ade7758_scan_el_group = {
		.attrs = ade7758_scan_el_attrs,
		.name = "scan_elements",
		};

		/**
		* ade7758_spi_read_burst() - read all data registers
		* ade7758_spi_read_burst() - read data registers
		* @dev: device associated with child of actual device (iio_dev or iio_trig)
		* @rx: somewhere to pass back the value read (min size is 24 bytes)
		**/
		static int ade7758_spi_read_burst(struct device dev, u8 rx)
		static int ade7758_spi_read_burst(struct device *dev)
		{
		struct spi_message msg;
		struct iio_dev *indio_dev = dev_get_drvdata(dev);
		struct ade7758_state *st = iio_dev_get_devdata(indio_dev);
		int ret;

		struct spi_transfer xfers[] = {
		{
		.tx_buf = st->tx,
		.rx_buf = rx,
		.bits_per_word = 8,
		.len = 4,
		}, {
		.tx_buf = st->tx + 4,
		.rx_buf = rx,
		.bits_per_word = 8,
		.len = 4,
		},
		};

		mutex_lock(&st->buf_lock);
		st->tx[0] = ADE7758_READ_REG(ADE7758_RSTATUS);
		st->tx[1] = 0;
		st->tx[2] = 0;
		st->tx[3] = 0;
		st->tx[4] = ADE7758_READ_REG(ADE7758_WFORM);
		st->tx[5] = 0;
		st->tx[6] = 0;
		st->tx[7] = 0;

		spi_message_init(&msg);
		spi_message_add_tail(&xfers[0], &msg);
		spi_message_add_tail(&xfers[1], &msg);
		ret = spi_sync(st->us, &msg);
		ret = spi_sync(st->us, &st->ring_msg);
		if (ret)
		dev_err(&st->us->dev, "problem when reading WFORM value\n");

		mutex_unlock(&st->buf_lock);
		return ret;
		}

		static int ade7758_write_waveform_type(struct device *dev, unsigned type)
		{
		int ret;
		u8 reg;

		ret = ade7758_spi_read_reg_8(dev,
		ADE7758_WAVMODE,
		&reg);
		if (ret)
		goto out;

		reg &= ~0x1F;
		reg \|= type & 0x1F;

		ret = ade7758_spi_write_reg_8(dev,
		ADE7758_WAVMODE,
		reg);
		out:
		return ret;
		}

		@@ -106,41 +72,70 @@ static irqreturn_t ade7758_trigger_handler(int irq, void *p)
		struct iio_dev *indio_dev = pf->private_data;
		struct iio_ring_buffer *ring = indio_dev->ring;
		struct ade7758_state *st = iio_dev_get_devdata(indio_dev);
		int i = 0;
		s32 *data;
		size_t datasize = ring->access.get_bytes_per_datum(ring);

		data = kmalloc(datasize, GFP_KERNEL);
		if (data == NULL) {
		dev_err(&st->us->dev, "memory alloc failed in ring bh");
		return -ENOMEM;
		}
		s64 dat64[2];
		u32 dat32 = (u32 )dat64;

		if (ring->scan_count)
		if (ade7758_spi_read_burst(&st->indio_dev->dev, st->rx) >= 0)
		for (; i < ring->scan_count; i++)
		data[i] = combine_8_to_32(st->rx[i*2+2],
		st->rx[i*2+1],
		st->rx[i*2]);
		if (ade7758_spi_read_burst(&st->indio_dev->dev) >= 0)
		*dat32 = get_unaligned_be32(&st->rx_buf[5]) & 0xFFFFFF;

		/* Guaranteed to be aligned with 8 byte boundary */
		if (ring->scan_timestamp)
		((s64 )
		(((u32)data + 4 * ring->scan_count + 4) & ~0x7)) =
		pf->timestamp;
		dat64[1] = pf->timestamp;

		ring->access.store_to(ring,
		(u8 *)data,
		pf->timestamp);
		ring->access.store_to(ring, (u8 *)dat64, pf->timestamp);

		iio_trigger_notify_done(st->indio_dev->trig);
		kfree(data);

		return IRQ_HANDLED;
		}

		/**
		* ade7758_ring_preenable() setup the parameters of the ring before enabling
		*
		* The complex nature of the setting of the nuber of bytes per datum is due
		* to this driver currently ensuring that the timestamp is stored at an 8
		* byte boundary.
		**/
		static int ade7758_ring_preenable(struct iio_dev *indio_dev)
		{
		struct ade7758_state *st = indio_dev->dev_data;
		struct iio_ring_buffer *ring = indio_dev->ring;
		size_t d_size;
		unsigned channel;

		if (!ring->scan_count)
		return -EINVAL;

		channel = __ffs(ring->scan_mask);

		d_size = st->ade7758_ring_channels[channel].scan_type.storagebits / 8;

		if (ring->scan_timestamp) {
		d_size += sizeof(s64);

		if (d_size % sizeof(s64))
		d_size += sizeof(s64) - (d_size % sizeof(s64));
		}

		if (indio_dev->ring->access.set_bytes_per_datum)
		indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring,
		d_size);

		ade7758_write_waveform_type(&indio_dev->dev,
		st->ade7758_ring_channels[channel].address);

		return 0;
		}

		void ade7758_unconfigure_ring(struct iio_dev *indio_dev)
		{
		/* ensure that the trigger has been detached */
		if (indio_dev->trig) {
		iio_put_trigger(indio_dev->trig);
		iio_trigger_dettach_poll_func(indio_dev->trig,
		indio_dev->pollfunc);
		}
		kfree(indio_dev->pollfunc->name);
		kfree(indio_dev->pollfunc);
		iio_sw_rb_free(indio_dev->ring);
		@@ -148,34 +143,28 @@ void ade7758_unconfigure_ring(struct iio_dev *indio_dev)

		int ade7758_configure_ring(struct iio_dev *indio_dev)
		{
		struct ade7758_state *st = indio_dev->dev_data;
		int ret = 0;
		struct iio_ring_buffer *ring;

		ring = iio_sw_rb_allocate(indio_dev);
		if (!ring) {
		indio_dev->ring = iio_sw_rb_allocate(indio_dev);
		if (!indio_dev->ring) {
		ret = -ENOMEM;
		return ret;
		}
		indio_dev->ring = ring;

		/* Effectively select the ring buffer implementation */
		iio_ring_sw_register_funcs(&ring->access);
		ring->bpe = 4;
		ring->scan_el_attrs = &ade7758_scan_el_group;
		ring->scan_timestamp = true;
		ring->preenable = &iio_sw_ring_preenable;
		ring->postenable = &iio_triggered_ring_postenable;
		ring->predisable = &iio_triggered_ring_predisable;
		ring->owner = THIS_MODULE;

		/* Set default scan mode */
		iio_scan_mask_set(ring, iio_scan_el_wform.number);
		iio_ring_sw_register_funcs(&indio_dev->ring->access);
		indio_dev->ring->preenable = &ade7758_ring_preenable;
		indio_dev->ring->postenable = &iio_triggered_ring_postenable;
		indio_dev->ring->predisable = &iio_triggered_ring_predisable;
		indio_dev->ring->owner = THIS_MODULE;

		indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
		if (indio_dev->pollfunc == NULL) {
		ret = -ENOMEM;
		goto error_iio_sw_rb_free;
		}
		indio_dev->pollfunc->private_data = indio_dev->ring;
		indio_dev->pollfunc->private_data = indio_dev;
		indio_dev->pollfunc->h = &iio_pollfunc_store_time;
		indio_dev->pollfunc->thread = &ade7758_trigger_handler;
		indio_dev->pollfunc->name
		@@ -186,6 +175,39 @@ int ade7758_configure_ring(struct iio_dev *indio_dev)
		}
		indio_dev->modes \|= INDIO_RING_TRIGGERED;

		st->tx_buf[0] = ADE7758_READ_REG(ADE7758_RSTATUS);
		st->tx_buf[1] = 0;
		st->tx_buf[2] = 0;
		st->tx_buf[3] = 0;
		st->tx_buf[4] = ADE7758_READ_REG(ADE7758_WFORM);
		st->tx_buf[5] = 0;
		st->tx_buf[6] = 0;
		st->tx_buf[7] = 0;

		/* build spi ring message */
		st->ring_xfer[0].tx_buf = &st->tx_buf[0];
		st->ring_xfer[0].len = 1;
		st->ring_xfer[0].bits_per_word = 8;
		st->ring_xfer[0].delay_usecs = 4;
		st->ring_xfer[1].rx_buf = &st->rx_buf[1];
		st->ring_xfer[1].len = 3;
		st->ring_xfer[1].bits_per_word = 8;
		st->ring_xfer[1].cs_change = 1;

		st->ring_xfer[2].tx_buf = &st->tx_buf[4];
		st->ring_xfer[2].len = 1;
		st->ring_xfer[2].bits_per_word = 8;
		st->ring_xfer[2].delay_usecs = 1;
		st->ring_xfer[3].rx_buf = &st->rx_buf[5];
		st->ring_xfer[3].len = 3;
		st->ring_xfer[3].bits_per_word = 8;

		spi_message_init(&st->ring_msg);
		spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
		spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
		spi_message_add_tail(&st->ring_xfer[2], &st->ring_msg);
		spi_message_add_tail(&st->ring_xfer[3], &st->ring_msg);

		return 0;

		error_free_pollfunc:
		@@ -195,11 +217,6 @@ error_iio_sw_rb_free:
		return ret;
		}

		int ade7758_initialize_ring(struct iio_ring_buffer *ring)
		{
		return iio_ring_buffer_register(ring, 0);
		}

		void ade7758_uninitialize_ring(struct iio_ring_buffer *ring)
		{
		iio_ring_buffer_unregister(ring);

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