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