138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.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 "../iio.h"
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#include "../ring_sw.h"
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#include "../trigger_consumer.h"
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#include "adis16209.h"
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/**
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* adis16209_read_ring_data() read data registers which will be placed into ring
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* @dev: device associated with child of actual device (iio_dev or iio_trig)
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* @rx: somewhere to pass back the value read
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**/
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static int adis16209_read_ring_data(struct device *dev, u8 *rx)
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{
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struct spi_message msg;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct adis16209_state *st = iio_priv(indio_dev);
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struct spi_transfer xfers[ADIS16209_OUTPUTS + 1];
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int ret;
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int i;
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mutex_lock(&st->buf_lock);
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spi_message_init(&msg);
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memset(xfers, 0, sizeof(xfers));
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for (i = 0; i <= ADIS16209_OUTPUTS; i++) {
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xfers[i].bits_per_word = 8;
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xfers[i].cs_change = 1;
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xfers[i].len = 2;
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xfers[i].delay_usecs = 30;
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xfers[i].tx_buf = st->tx + 2 * i;
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st->tx[2 * i]
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= ADIS16209_READ_REG(ADIS16209_SUPPLY_OUT + 2 * i);
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st->tx[2 * i + 1] = 0;
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if (i >= 1)
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xfers[i].rx_buf = rx + 2 * (i - 1);
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spi_message_add_tail(&xfers[i], &msg);
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}
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ret = spi_sync(st->us, &msg);
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if (ret)
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dev_err(&st->us->dev, "problem when burst reading");
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mutex_unlock(&st->buf_lock);
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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 to device
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* specific to be rolled into the core.
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*/
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static irqreturn_t adis16209_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 adis16209_state *st = iio_priv(indio_dev);
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struct iio_buffer *ring = indio_dev->buffer;
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int i = 0;
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s16 *data;
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size_t datasize = ring->access->get_bytes_per_datum(ring);
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data = kmalloc(datasize , GFP_KERNEL);
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if (data == NULL) {
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dev_err(&st->us->dev, "memory alloc failed in ring bh");
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return -ENOMEM;
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}
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if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength) &&
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adis16209_read_ring_data(&indio_dev->dev, st->rx) >= 0)
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for (; i < bitmap_weight(indio_dev->active_scan_mask,
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indio_dev->masklength); i++)
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data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
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/* Guaranteed to be aligned with 8 byte boundary */
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if (ring->scan_timestamp)
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*((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
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ring->access->store_to(ring, (u8 *)data, pf->timestamp);
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iio_trigger_notify_done(indio_dev->trig);
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kfree(data);
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return IRQ_HANDLED;
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}
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void adis16209_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_sw_rb_free(indio_dev->buffer);
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}
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static const struct iio_buffer_setup_ops adis16209_ring_setup_ops = {
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.preenable = &iio_sw_buffer_preenable,
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.postenable = &iio_triggered_buffer_postenable,
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.predisable = &iio_triggered_buffer_predisable,
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};
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int adis16209_configure_ring(struct iio_dev *indio_dev)
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{
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int ret = 0;
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struct iio_buffer *ring;
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ring = iio_sw_rb_allocate(indio_dev);
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if (!ring) {
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ret = -ENOMEM;
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return ret;
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}
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indio_dev->buffer = ring;
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ring->scan_timestamp = true;
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indio_dev->setup_ops = &adis16209_ring_setup_ops;
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indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
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&adis16209_trigger_handler,
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IRQF_ONESHOT,
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indio_dev,
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"%s_consumer%d",
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indio_dev->name,
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indio_dev->id);
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if (indio_dev->pollfunc == NULL) {
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ret = -ENOMEM;
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goto error_iio_sw_rb_free;
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}
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indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
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return 0;
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error_iio_sw_rb_free:
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iio_sw_rb_free(indio_dev->buffer);
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return ret;
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}
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