1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <hostIntf.h> 18#include <hostIntf_priv.h> 19#include <nanohubPacket.h> 20#include <i2c.h> 21 22#define NANOHUB_I2C_SLAVE_ADDRESS 0x55 23static uint32_t gBusId; 24 25static void hostIntfI2cPreambleCallback(void *cookie, size_t tx, size_t rx, int err) 26{ 27} 28 29static void hostIntfI2cRxCallback(void *cookie, size_t tx, size_t rx, int err) 30{ 31 HostIntfCommCallbackF callback = cookie; 32 i2cSlaveTxPreamble(gBusId, NANOHUB_PREAMBLE_BYTE, 33 hostIntfI2cPreambleCallback, NULL); 34 callback(rx, err); 35} 36 37static void hostIntfI2cTxCallback(void *cookie, size_t tx, size_t rx, int err) 38{ 39 HostIntfCommCallbackF callback = cookie; 40 i2cSlaveTxPreamble(gBusId, NANOHUB_PREAMBLE_BYTE, 41 hostIntfI2cPreambleCallback, NULL); 42 callback(tx, err); 43} 44 45static int hostIntfI2cRequest() 46{ 47 return i2cSlaveRequest(gBusId, NANOHUB_I2C_SLAVE_ADDRESS); 48} 49 50static int hostIntfI2cRxPacket(void *rxBuf, size_t rxSize, 51 HostIntfCommCallbackF callback) 52{ 53 i2cSlaveEnableRx(gBusId, rxBuf, rxSize, hostIntfI2cRxCallback, 54 callback); 55 return 0; 56} 57 58static int hostIntfI2cTxPacket(const void *txBuf, size_t txSize, 59 HostIntfCommCallbackF callback) 60{ 61 return i2cSlaveTxPacket(gBusId, txBuf, txSize, hostIntfI2cTxCallback, 62 callback); 63} 64 65static int hostIntfI2cRelease(void) 66{ 67 return i2cSlaveRelease(gBusId); 68} 69 70static const struct HostIntfComm gI2cComm = { 71 .request = hostIntfI2cRequest, 72 .rxPacket = hostIntfI2cRxPacket, 73 .txPacket = hostIntfI2cTxPacket, 74 .release = hostIntfI2cRelease, 75}; 76 77const struct HostIntfComm *hostIntfI2cInit(uint32_t busId) 78{ 79 gBusId = busId; 80 return &gI2cComm; 81} 82