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      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
     23 static uint32_t gBusId;
     24 
     25 static void hostIntfI2cPreambleCallback(void *cookie, size_t tx, size_t rx, int err)
     26 {
     27 }
     28 
     29 static 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 
     37 static 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 
     45 static int hostIntfI2cRequest()
     46 {
     47     return i2cSlaveRequest(gBusId, NANOHUB_I2C_SLAVE_ADDRESS);
     48 }
     49 
     50 static int hostIntfI2cRxPacket(void *rxBuf, size_t rxSize,
     51         HostIntfCommCallbackF callback)
     52 {
     53     i2cSlaveEnableRx(gBusId, rxBuf, rxSize, hostIntfI2cRxCallback,
     54             callback);
     55     return 0;
     56 }
     57 
     58 static int hostIntfI2cTxPacket(const void *txBuf, size_t txSize,
     59         HostIntfCommCallbackF callback)
     60 {
     61     return i2cSlaveTxPacket(gBusId, txBuf, txSize, hostIntfI2cTxCallback,
     62             callback);
     63 }
     64 
     65 static int hostIntfI2cRelease(void)
     66 {
     67     return i2cSlaveRelease(gBusId);
     68 }
     69 
     70 static const struct HostIntfComm gI2cComm = {
     71    .request = hostIntfI2cRequest,
     72    .rxPacket = hostIntfI2cRxPacket,
     73    .txPacket = hostIntfI2cTxPacket,
     74    .release = hostIntfI2cRelease,
     75 };
     76 
     77 const struct HostIntfComm *hostIntfI2cInit(uint32_t busId)
     78 {
     79     gBusId = busId;
     80     return &gI2cComm;
     81 }
     82