67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
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/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <spi.h>
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#include <syscall_handler.h>
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#ifndef CONFIG_SPI_LEGACY_API
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static void verify_spi_buf_array(struct spi_buf *bufs, size_t len,
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int writable, void *ssf)
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{
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/* Empty array, nothing to do */
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if (!len) {
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return;
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}
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/* Validate the array of struct spi_buf instances */
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_SYSCALL_MEMORY_ARRAY_READ(bufs, len, sizeof(struct spi_buf));
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for ( ; len; --len, ++bufs) {
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/* Now for each array element, validate the memory buffers
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* that they point to
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*/
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_SYSCALL_MEMORY(bufs->buf, bufs->len, writable);
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}
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}
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_SYSCALL_HANDLER(spi_transceive, config_p, tx_bufs, tx_count, rx_bufs,
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rx_count)
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{
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struct spi_config *config = (struct spi_config *)config_p;
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_SYSCALL_MEMORY_READ(config, sizeof(*config));
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_SYSCALL_OBJ(config->dev, K_OBJ_DRIVER_SPI);
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/* ssf is implicit system call stack frame parameter, used by
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* _SYSCALL_* APIs when something goes wrong.
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*/
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verify_spi_buf_array((struct spi_buf *)tx_bufs, tx_count, 0, ssf);
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verify_spi_buf_array((struct spi_buf *)rx_bufs, rx_count, 1, ssf);
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if (config->cs) {
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struct spi_cs_control *cs = config->cs;
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_SYSCALL_MEMORY_READ(cs, sizeof(*cs));
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if (cs->gpio_dev) {
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_SYSCALL_OBJ(cs->gpio_dev, K_OBJ_DRIVER_GPIO);
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}
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}
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return _impl_spi_transceive(config, (const struct spi_buf *)tx_bufs,
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tx_count, (struct spi_buf *)rx_bufs,
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rx_count);
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}
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_SYSCALL_HANDLER(spi_release, config_p)
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{
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struct spi_config *config = (struct spi_config *)config_p;
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_SYSCALL_MEMORY_READ(config, sizeof(*config));
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_SYSCALL_OBJ(config->dev, K_OBJ_DRIVER_SPI);
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return _impl_spi_release(config);
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}
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#endif
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