103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <hostIntf.h>
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#include <hostIntf_priv.h>
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#include <nanohubPacket.h>
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#include <spi.h>
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static uint8_t gBusId;
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static struct SpiDevice *gSpi;
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static void *gRxBuf;
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static size_t gTxSize;
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static struct SpiPacket gPacket;
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static const struct SpiMode gSpiMode = {
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.cpol = SPI_CPOL_IDLE_LO,
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.cpha = SPI_CPHA_LEADING_EDGE,
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.bitsPerWord = 8,
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.format = SPI_FORMAT_MSB_FIRST,
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.txWord = NANOHUB_PREAMBLE_BYTE,
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};
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static void hostIntfSpiRxCallback(void *cookie, int err)
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{
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struct NanohubPacket *packet = gRxBuf;
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HostIntfCommCallbackF callback = cookie;
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callback(NANOHUB_PACKET_SIZE(packet->len), err);
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}
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static void hostIntfSpiTxCallback(void *cookie, int err)
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{
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HostIntfCommCallbackF callback = cookie;
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callback(gTxSize, err);
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}
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static int hostIntfSpiRequest()
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{
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return spiSlaveRequest(gBusId, &gSpiMode, &gSpi);
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}
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static int hostIntfSpiRxPacket(void *rxBuf, size_t rxSize,
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HostIntfCommCallbackF callback)
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{
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int err;
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gPacket.rxBuf = gRxBuf = rxBuf;
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gPacket.txBuf = NULL;
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gPacket.size = rxSize;
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err = spiSlaveRxTx(gSpi, &gPacket, 1, hostIntfSpiRxCallback, callback);
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if (err < 0)
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callback(0, err);
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return 0;
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}
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static int hostIntfSpiTxPacket(const void *txBuf, size_t txSize,
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HostIntfCommCallbackF callback)
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{
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((uint8_t *)txBuf)[txSize] = NANOHUB_PREAMBLE_BYTE;
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gTxSize = txSize;
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gPacket.rxBuf = NULL;
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gPacket.txBuf = txBuf;
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gPacket.size = txSize + 1;
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return spiSlaveRxTx(gSpi, &gPacket, 1, hostIntfSpiTxCallback,
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callback);
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}
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static int hostIntfSpiRelease(void)
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{
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return spiSlaveRelease(gSpi);
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}
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static const struct HostIntfComm gSpiComm = {
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.request = hostIntfSpiRequest,
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.rxPacket = hostIntfSpiRxPacket,
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.txPacket = hostIntfSpiTxPacket,
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.release = hostIntfSpiRelease,
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};
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const struct HostIntfComm *hostIntfSpiInit(uint8_t busId)
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{
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gBusId = busId;
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return &gSpiComm;
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}
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