spibus.c

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/*
 * Copyright (C) 2008-2009 by egnite GmbH
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 */

#include <sys/device.h>
#include <sys/nutdebug.h>

#include <dev/spibus.h>

int NutRegisterSpiDevice(NUTDEVICE * dev, NUTSPIBUS * bus, int cs)
{
    int rc;
    NUTSPINODE *node;

    NUTASSERT(dev != NULL);
    NUTASSERT(dev->dev_icb != NULL);
    node = (NUTSPINODE *) dev->dev_icb;

    NUTASSERT(bus != NULL);
    NUTASSERT(bus->bus_initnode != NULL);

    /* Attach the bus controller driver and set the chip select number
       ** before calling the bus controller initialization routine. */
    node->node_bus = bus;
    node->node_cs = cs;
    rc = (*bus->bus_initnode) (node);

    /* If the bus had been successfully initialized for this device,
       ** then set up a mutex lock for the bus and register the device. */
    if (rc == 0) {
        NutEventPost(&bus->bus_mutex);
        rc = NutRegisterDevice(dev, 0, 0);
    }
    return rc;
}

int NutSpiBusWait(NUTSPINODE * node, uint32_t tmo)
{
    return 0;
}

uint_fast16_t NutSpiBusSetMode(NUTSPINODE * node, uint_fast16_t mode)
{
    uint16_t rc = node->node_mode;

    if (mode != SPI_CURRENT_MODE) {
        node->node_mode = mode | SPI_MODE_UPDATE;
    }
    return rc;
}

uint_fast32_t NutSpiBusSetRate(NUTSPINODE * node, uint_fast32_t rate)
{
    uint32_t rc = node->node_rate;

    if (rate != SPI_CURRENT_RATE) {
        node->node_rate = rate;
        node->node_mode |= SPI_MODE_UPDATE;
    }
    return rc;
}

uint_fast8_t NutSpiBusSetBits(NUTSPINODE * node, uint_fast8_t bits)
{
    uint_fast8_t rc = node->node_bits;

    if (bits != SPI_CURRENT_BITS) {
        node->node_bits = bits;
        node->node_mode |= SPI_MODE_UPDATE;
    }
    return rc;
}