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/**
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 * @file spi_devfs.c
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 * @brief
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 * @author Denis Deryugin <deryugin.denis@gmail.com>
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 * @version
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 * @date 05.12.2018
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 */
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#include <assert.h>
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#include <stdint.h>
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#include <sys/uio.h>
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#include <drivers/char_dev.h>
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#include <drivers/spi.h>
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#include <util/log.h>
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static ssize_t spi_read(struct char_dev *cdev, void *buf, size_t nbyte) {
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	struct spi_device *dev;
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	assert(cdev);
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	assert(buf);
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	dev = (struct spi_device *)cdev;
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	spi_transfer(dev, NULL, buf, nbyte);
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	return nbyte;
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}
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static ssize_t spi_write(struct char_dev *cdev, const void *buf, size_t nbyte) {
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	struct spi_device *dev;
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	assert(cdev);
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	assert(buf);
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	dev = (struct spi_device *)cdev;
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	spi_transfer(dev, (void *)buf, NULL, nbyte);
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	return nbyte;
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}
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static int spi_ioctl(struct char_dev *cdev, int request, void *data) {
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	struct spi_transfer_arg *transfer_arg;
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	struct spi_device *dev;
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	assert(cdev);
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	dev = (struct spi_device *)cdev;
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	log_debug("request=0x%x data=%p", request, data);
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	switch (request) {
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	case SPI_IOCTL_CS:
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		spi_select(dev, (int)(intptr_t)data);
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		break;
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	case SPI_IOCTL_TRANSFER:
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		transfer_arg = data;
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		spi_transfer(dev, transfer_arg->in, transfer_arg->out,
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		    transfer_arg->count);
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		break;
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	case SPI_IOCTL_CS_MODE:
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		dev->flags = (int)(intptr_t)data;
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		break;
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	}
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	return 0;
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}
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const struct char_dev_ops __spi_cdev_ops = {
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    .read = spi_read,
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    .write = spi_write,
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    .ioctl = spi_ioctl,
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};
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