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/*
* 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/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include "../iio.h"
#include "../ring_sw.h"
#include "../trigger.h"
#include "ade7758.h"
/**
* ade7758_spi_read_burst() - read data registers
* @dev: device associated with child of actual device (iio_dev or iio_trig)
**/
static int ade7758_spi_read_burst(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ade7758_state *st = iio_priv(indio_dev);
int ret;
ret = spi_sync(st->us, &st->ring_msg);
if (ret)
dev_err(&st->us->dev, "problem when reading WFORM value\n");
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,
®);
if (ret)
goto out;
reg &= ~0x1F;
reg |= type & 0x1F;
ret = ade7758_spi_write_reg_8(dev,
ADE7758_WAVMODE,
reg);
out:
return ret;
}
/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
* specific to be rolled into the core.
*/
static irqreturn_t ade7758_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct iio_ring_buffer *ring = indio_dev->ring;
struct ade7758_state *st = iio_priv(indio_dev);
s64 dat64[2];
u32 *dat32 = (u32 *)dat64;
if (ring->scan_count)
if (ade7758_spi_read_burst(&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)
dat64[1] = pf->timestamp;
ring->access->store_to(ring, (u8 *)dat64, pf->timestamp);
iio_trigger_notify_done(indio_dev->trig);
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 = iio_priv(indio_dev);
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;
}
static const struct iio_ring_setup_ops ade7758_ring_setup_ops = {
.preenable = &ade7758_ring_preenable,
.postenable = &iio_triggered_ring_postenable,
.predisable = &iio_triggered_ring_predisable,
};
void ade7758_unconfigure_ring(struct iio_dev *indio_dev)
{
iio_dealloc_pollfunc(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->ring);
}
int ade7758_configure_ring(struct iio_dev *indio_dev)
{
struct ade7758_state *st = iio_priv(indio_dev);
int ret = 0;
indio_dev->ring = iio_sw_rb_allocate(indio_dev);
if (!indio_dev->ring) {
ret = -ENOMEM;
return ret;
}
/* Effectively select the ring buffer implementation */
indio_dev->ring->access = &ring_sw_access_funcs;
indio_dev->ring->setup_ops = &ade7758_ring_setup_ops;
indio_dev->ring->owner = THIS_MODULE;
indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
&ade7758_trigger_handler,
0,
indio_dev,
"ade7759_consumer%d",
indio_dev->id);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_iio_sw_rb_free;
}
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_iio_sw_rb_free:
iio_sw_rb_free(indio_dev->ring);
return ret;
}
void ade7758_uninitialize_ring(struct iio_ring_buffer *ring)
{
iio_ring_buffer_unregister(ring);
}
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