160 строки
4.0 KiB
C
160 строки
4.0 KiB
C
/*
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* Common library for ADIS16XXX devices
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*
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* Copyright 2012 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2 or later.
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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/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 <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/imu/adis.h>
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int adis_update_scan_mode(struct iio_dev *indio_dev,
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const unsigned long *scan_mask)
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{
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struct adis *adis = iio_device_get_drvdata(indio_dev);
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const struct iio_chan_spec *chan;
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unsigned int scan_count;
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unsigned int i, j;
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__be16 *tx, *rx;
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kfree(adis->xfer);
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kfree(adis->buffer);
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scan_count = indio_dev->scan_bytes / 2;
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adis->xfer = kcalloc(scan_count + 1, sizeof(*adis->xfer), GFP_KERNEL);
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if (!adis->xfer)
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return -ENOMEM;
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adis->buffer = kzalloc(indio_dev->scan_bytes * 2, GFP_KERNEL);
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if (!adis->buffer)
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return -ENOMEM;
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rx = adis->buffer;
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tx = rx + indio_dev->scan_bytes;
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spi_message_init(&adis->msg);
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for (j = 0; j <= scan_count; j++) {
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adis->xfer[j].bits_per_word = 8;
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if (j != scan_count)
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adis->xfer[j].cs_change = 1;
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adis->xfer[j].len = 2;
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adis->xfer[j].delay_usecs = adis->data->read_delay;
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if (j < scan_count)
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adis->xfer[j].tx_buf = &tx[j];
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if (j >= 1)
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adis->xfer[j].rx_buf = &rx[j - 1];
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spi_message_add_tail(&adis->xfer[j], &adis->msg);
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}
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chan = indio_dev->channels;
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for (i = 0; i < indio_dev->num_channels; i++, chan++) {
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if (!test_bit(chan->scan_index, scan_mask))
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continue;
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*tx++ = cpu_to_be16(chan->address << 8);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(adis_update_scan_mode);
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static irqreturn_t adis_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 adis *adis = iio_device_get_drvdata(indio_dev);
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int ret;
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if (!adis->buffer)
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return -ENOMEM;
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ret = spi_sync(adis->spi, &adis->msg);
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if (ret)
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dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
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/* Guaranteed to be aligned with 8 byte boundary */
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if (indio_dev->scan_timestamp) {
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void *b = adis->buffer + indio_dev->scan_bytes - sizeof(s64);
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*(s64 *)b = pf->timestamp;
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}
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iio_push_to_buffers(indio_dev, adis->buffer);
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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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* adis_setup_buffer_and_trigger() - Sets up buffer and trigger for the adis device
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* @adis: The adis device.
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* @indio_dev: The IIO device.
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* @trigger_handler: Optional trigger handler, may be NULL.
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*
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* Returns 0 on success, a negative error code otherwise.
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*
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* This function sets up the buffer and trigger for a adis devices. If
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* 'trigger_handler' is NULL the default trigger handler will be used. The
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* default trigger handler will simply read the registers assigned to the
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* currently active channels.
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*
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* adis_cleanup_buffer_and_trigger() should be called to free the resources
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* allocated by this function.
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*/
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int adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
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irqreturn_t (*trigger_handler)(int, void *))
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{
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int ret;
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if (!trigger_handler)
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trigger_handler = adis_trigger_handler;
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ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
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trigger_handler, NULL);
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if (ret)
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return ret;
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if (adis->spi->irq) {
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ret = adis_probe_trigger(adis, indio_dev);
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if (ret)
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goto error_buffer_cleanup;
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}
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return 0;
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error_buffer_cleanup:
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iio_triggered_buffer_cleanup(indio_dev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(adis_setup_buffer_and_trigger);
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/**
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* adis_cleanup_buffer_and_trigger() - Free buffer and trigger resources
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* @adis: The adis device.
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* @indio_dev: The IIO device.
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*
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* Frees resources allocated by adis_setup_buffer_and_trigger()
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*/
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void adis_cleanup_buffer_and_trigger(struct adis *adis,
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struct iio_dev *indio_dev)
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{
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if (adis->spi->irq)
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adis_remove_trigger(adis);
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kfree(adis->buffer);
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kfree(adis->xfer);
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iio_triggered_buffer_cleanup(indio_dev);
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}
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EXPORT_SYMBOL_GPL(adis_cleanup_buffer_and_trigger);
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