178 lines
4.4 KiB
C
178 lines
4.4 KiB
C
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/*
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* ADE7758 Poly Phase Multifunction Energy Metering IC driver
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*
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* Copyright 2010-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/kfifo_buf.h>
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#include <linux/iio/trigger_consumer.h>
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#include "ade7758.h"
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/**
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* ade7758_spi_read_burst() - read data registers
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* @indio_dev: the IIO device
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**/
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static int ade7758_spi_read_burst(struct iio_dev *indio_dev)
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{
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struct ade7758_state *st = iio_priv(indio_dev);
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int ret;
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ret = spi_sync(st->us, &st->ring_msg);
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if (ret)
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dev_err(&st->us->dev, "problem when reading WFORM value\n");
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return ret;
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}
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static int ade7758_write_waveform_type(struct device *dev, unsigned int type)
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{
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int ret;
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u8 reg;
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ret = ade7758_spi_read_reg_8(dev, ADE7758_WAVMODE, ®);
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if (ret)
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goto out;
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reg &= ~0x1F;
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reg |= type & 0x1F;
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ret = ade7758_spi_write_reg_8(dev, ADE7758_WAVMODE, reg);
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out:
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return ret;
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}
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/* Whilst this makes a lot of calls to iio_sw_ring functions - it is too device
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* specific to be rolled into the core.
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*/
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static irqreturn_t ade7758_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct ade7758_state *st = iio_priv(indio_dev);
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s64 dat64[2];
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u32 *dat32 = (u32 *)dat64;
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if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
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if (ade7758_spi_read_burst(indio_dev) >= 0)
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*dat32 = get_unaligned_be32(&st->rx_buf[5]) & 0xFFFFFF;
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iio_push_to_buffers_with_timestamp(indio_dev, dat64, pf->timestamp);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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/**
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* ade7758_ring_preenable() setup the parameters of the ring before enabling
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*
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* The complex nature of the setting of the number of bytes per datum is due
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* to this driver currently ensuring that the timestamp is stored at an 8
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* byte boundary.
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**/
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static int ade7758_ring_preenable(struct iio_dev *indio_dev)
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{
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unsigned int channel;
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if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
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return -EINVAL;
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channel = find_first_bit(indio_dev->active_scan_mask,
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indio_dev->masklength);
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ade7758_write_waveform_type(&indio_dev->dev,
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indio_dev->channels[channel].address);
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return 0;
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}
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static const struct iio_buffer_setup_ops ade7758_ring_setup_ops = {
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.preenable = &ade7758_ring_preenable,
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.postenable = &iio_triggered_buffer_postenable,
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.predisable = &iio_triggered_buffer_predisable,
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.validate_scan_mask = &iio_validate_scan_mask_onehot,
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};
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void ade7758_unconfigure_ring(struct iio_dev *indio_dev)
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{
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iio_dealloc_pollfunc(indio_dev->pollfunc);
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iio_kfifo_free(indio_dev->buffer);
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}
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int ade7758_configure_ring(struct iio_dev *indio_dev)
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{
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struct ade7758_state *st = iio_priv(indio_dev);
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struct iio_buffer *buffer;
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int ret = 0;
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buffer = iio_kfifo_allocate();
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if (!buffer)
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return -ENOMEM;
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iio_device_attach_buffer(indio_dev, buffer);
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indio_dev->setup_ops = &ade7758_ring_setup_ops;
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indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
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&ade7758_trigger_handler,
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0,
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indio_dev,
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"ade7759_consumer%d",
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indio_dev->id);
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if (!indio_dev->pollfunc) {
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ret = -ENOMEM;
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goto error_iio_kfifo_free;
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}
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indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
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st->tx_buf[0] = ADE7758_READ_REG(ADE7758_RSTATUS);
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st->tx_buf[1] = 0;
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st->tx_buf[2] = 0;
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st->tx_buf[3] = 0;
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st->tx_buf[4] = ADE7758_READ_REG(ADE7758_WFORM);
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st->tx_buf[5] = 0;
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st->tx_buf[6] = 0;
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st->tx_buf[7] = 0;
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/* build spi ring message */
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st->ring_xfer[0].tx_buf = &st->tx_buf[0];
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st->ring_xfer[0].len = 1;
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st->ring_xfer[0].bits_per_word = 8;
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st->ring_xfer[0].delay_usecs = 4;
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st->ring_xfer[1].rx_buf = &st->rx_buf[1];
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st->ring_xfer[1].len = 3;
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st->ring_xfer[1].bits_per_word = 8;
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st->ring_xfer[1].cs_change = 1;
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st->ring_xfer[2].tx_buf = &st->tx_buf[4];
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st->ring_xfer[2].len = 1;
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st->ring_xfer[2].bits_per_word = 8;
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st->ring_xfer[2].delay_usecs = 1;
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st->ring_xfer[3].rx_buf = &st->rx_buf[5];
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st->ring_xfer[3].len = 3;
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st->ring_xfer[3].bits_per_word = 8;
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spi_message_init(&st->ring_msg);
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spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
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spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
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spi_message_add_tail(&st->ring_xfer[2], &st->ring_msg);
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spi_message_add_tail(&st->ring_xfer[3], &st->ring_msg);
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return 0;
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error_iio_kfifo_free:
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iio_kfifo_free(indio_dev->buffer);
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return ret;
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}
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