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
hostIntfI2cPreambleCallback(void * cookie,size_t tx,size_t rx,int err)25 static void hostIntfI2cPreambleCallback(void *cookie, size_t tx, size_t rx, int err)
26 {
27 }
28
hostIntfI2cRxCallback(void * cookie,size_t tx,size_t rx,int err)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
hostIntfI2cTxCallback(void * cookie,size_t tx,size_t rx,int err)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
hostIntfI2cRequest()45 static int hostIntfI2cRequest()
46 {
47 return i2cSlaveRequest(gBusId, NANOHUB_I2C_SLAVE_ADDRESS);
48 }
49
hostIntfI2cRxPacket(void * rxBuf,size_t rxSize,HostIntfCommCallbackF callback)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
hostIntfI2cTxPacket(const void * txBuf,size_t txSize,HostIntfCommCallbackF callback)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
hostIntfI2cRelease(void)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
hostIntfI2cInit(uint32_t busId)77 const struct HostIntfComm *hostIntfI2cInit(uint32_t busId)
78 {
79 gBusId = busId;
80 return &gI2cComm;
81 }
82