OpenHarmony-v3.1.7-Release/s

/*
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd.
 *
 * HDF is dual licensed: you can use it either under the terms of
 * the GPL, or the BSD license, at your option.
 * See the LICENSE file in the root of this repository for complete details.
 */

#include "i2c_core.h"
#include "hdf_device_desc.h"
#include "hdf_log.h"
#include "osal_mem.h"
#include "osal_time.h"
#include "platform_core.h"

#define HDF_LOG_TAG i2c_core
#define LOCK_WAIT_SECONDS_M 1
#define I2C_HANDLE_SHIFT    ((uintptr_t)(-1) << 16)

struct I2cManager {
    struct IDeviceIoService service;
    struct HdfDeviceObject *device;
    struct I2cCntlr *cntlrs[I2C_BUS_MAX];
    struct OsalMutex lock;
};

static struct I2cManager *g_i2cManager = NULL;

static int32_t I2cCntlrLockDefault(struct I2cCntlr *cntlr)
{
    if (cntlr == NULL) {
        return HDF_ERR_INVALID_OBJECT;
    }
    return OsalMutexLock(&cntlr->lock);
}

static void I2cCntlrUnlockDefault(struct I2cCntlr *cntlr)
{
    if (cntlr == NULL) {
        return;
    }
    (void)OsalMutexUnlock(&cntlr->lock);
}

static const struct I2cLockMethod g_i2cLockOpsDefault = {
    .lock = I2cCntlrLockDefault,
    .unlock = I2cCntlrUnlockDefault,
};

static int32_t I2cManagerAddCntlr(struct I2cCntlr *cntlr)
{
    int32_t ret;
    struct I2cManager *manager = g_i2cManager;

    if (cntlr->busId >= I2C_BUS_MAX) {
        HDF_LOGE("I2cManagerAddCntlr: busId:%d exceed!", cntlr->busId);
        return HDF_ERR_INVALID_PARAM;
    }

    if (manager == NULL) {
        HDF_LOGE("I2cManagerAddCntlr: get i2c manager fail!");
        return HDF_ERR_NOT_SUPPORT;
    }
    if (OsalMutexLock(&manager->lock) != HDF_SUCCESS) {
        HDF_LOGE("I2cManagerAddCntlr: lock i2c manager fail!");
        return HDF_ERR_DEVICE_BUSY;
    }

    if (manager->cntlrs[cntlr->busId] != NULL) {
        HDF_LOGE("I2cManagerAddCntlr: cntlr of bus:%d already exits!", cntlr->busId);
        ret = HDF_FAILURE;
    } else {
        manager->cntlrs[cntlr->busId] = cntlr;
        ret = HDF_SUCCESS;
    }

    (void)OsalMutexUnlock(&manager->lock);
    return ret;
}

static void I2cManagerRemoveCntlr(struct I2cCntlr *cntlr)
{
    struct I2cManager *manager = g_i2cManager;

    if (cntlr->busId < 0 || cntlr->busId >= I2C_BUS_MAX) {
        HDF_LOGE("I2cManagerRemoveCntlr: invalid busId:%d!", cntlr->busId);
        return;
    }

    if (manager == NULL) {
        HDF_LOGE("I2cManagerRemoveCntlr: get i2c manager fail!");
        return;
    }
    if (OsalMutexLock(&manager->lock) != HDF_SUCCESS) {
        HDF_LOGE("I2cManagerRemoveCntlr: lock i2c manager fail!");
        return;
    }

    if (manager->cntlrs[cntlr->busId] != cntlr) {
        HDF_LOGE("I2cManagerRemoveCntlr: cntlr(%d) not in manager!", cntlr->busId);
    } else {
        manager->cntlrs[cntlr->busId] = NULL;
    }

    (void)OsalMutexUnlock(&manager->lock);
}

/*
 * Find an i2c controller by bus number, without ref count
 */
static struct I2cCntlr *I2cManagerFindCntlr(int16_t number)
{
    struct I2cCntlr *cntlr = NULL;
    struct I2cManager *manager = g_i2cManager;

    if (number < 0 || number >= I2C_BUS_MAX) {
        HDF_LOGE("I2cManagerFindCntlr: invalid busId:%d!", number);
        return NULL;
    }

    if (manager == NULL) {
        HDF_LOGE("I2cManagerFindCntlr: get i2c manager fail!");
        return NULL;
    }

    if (OsalMutexLock(&manager->lock) != HDF_SUCCESS) {
        HDF_LOGE("I2cManagerFindCntlr: lock i2c manager fail!");
        return NULL;
    }
    cntlr = manager->cntlrs[number];
    (void)OsalMutexUnlock(&manager->lock);
    return cntlr;
}

/*
 * Find and return an i2c controller by number, with ref count(TO DO ...)
 */
struct I2cCntlr *I2cCntlrGet(int16_t number)
{
    return I2cManagerFindCntlr(number);
}

/*
 * Put back the i2c controller, with ref count(TO DO ...)
 */
void I2cCntlrPut(struct I2cCntlr *cntlr)
{
    (void)cntlr;
}

int32_t I2cCntlrAdd(struct I2cCntlr *cntlr)
{
    int32_t ret;

    if (cntlr == NULL) {
        return HDF_ERR_INVALID_OBJECT;
    }

    if (cntlr->ops == NULL) {
        HDF_LOGE("I2cCntlrAdd: no ops supplied!");
        return HDF_ERR_INVALID_OBJECT;
    }

    if (cntlr->lockOps == NULL) {
        HDF_LOGI("I2cCntlrAdd: use default lock methods!");
        cntlr->lockOps = &g_i2cLockOpsDefault;
    }

    if (OsalMutexInit(&cntlr->lock) != HDF_SUCCESS) {
        HDF_LOGE("I2cCntlrAdd: init lock fail!");
        return HDF_FAILURE;
    }

    ret = I2cManagerAddCntlr(cntlr);
    if (ret != HDF_SUCCESS) {
        (void)OsalMutexDestroy(&cntlr->lock);
        return ret;
    }
    return HDF_SUCCESS;
}

void I2cCntlrRemove(struct I2cCntlr *cntlr)
{
    if (cntlr == NULL) {
        return;
    }
    I2cManagerRemoveCntlr(cntlr);
    (void)OsalMutexDestroy(&cntlr->lock);
}

static inline int32_t I2cCntlrLock(struct I2cCntlr *cntlr)
{
    if (cntlr->lockOps == NULL || cntlr->lockOps->lock == NULL) {
        return HDF_ERR_NOT_SUPPORT;
    }
    return cntlr->lockOps->lock(cntlr);
}

static inline void I2cCntlrUnlock(struct I2cCntlr *cntlr)
{
    if (cntlr->lockOps != NULL && cntlr->lockOps->unlock != NULL) {
        cntlr->lockOps->unlock(cntlr);
    }
}

int32_t I2cCntlrTransfer(struct I2cCntlr *cntlr, struct I2cMsg *msgs, int16_t count)
{
    int32_t ret;

    if (cntlr == NULL) {
        HDF_LOGE("I2cCntlrTransfer: cntlr is null");
        return HDF_ERR_INVALID_OBJECT;
    }

    if (cntlr->ops == NULL || cntlr->ops->transfer == NULL) {
        HDF_LOGE("I2cCntlrTransfer: ops or transfer is null");
        return HDF_ERR_NOT_SUPPORT;
    }

    if (I2cCntlrLock(cntlr) != HDF_SUCCESS) {
        HDF_LOGE("I2cCntlrTransfer: lock controller fail!");
        return HDF_ERR_DEVICE_BUSY;
    }
    ret = cntlr->ops->transfer(cntlr, msgs, count);
    I2cCntlrUnlock(cntlr);
    return ret;
}

static int32_t I2cTransferReadOneMsg(struct HdfSBuf *data, struct I2cMsg *msgs, int16_t i, uint32_t *lenReply)
{
    uint32_t len;
    uint8_t *buf = NULL;

    if (!HdfSbufReadUint16(data, &msgs[i].addr)) {
        HDF_LOGE("I2cTransferReadOneMsg: read addr fail!");
        return HDF_ERR_IO;
    }
    if (!HdfSbufReadUint16(data, &msgs[i].flags)) {
        HDF_LOGE("I2cTransferReadOneMsg: read flags fail!");
        return HDF_ERR_IO;
    }
    if (!HdfSbufReadUint16(data, &msgs[i].len)) {
        HDF_LOGE("I2cTransferReadOneMsg: read len fail!");
        return HDF_ERR_IO;
    }
    if ((msgs[i].flags & I2C_FLAG_READ) != 0) {
        *lenReply += msgs[i].len;
    } else if (!HdfSbufReadBuffer(data, (const void **)&buf, &len)) {
        HDF_LOGE("I2cTransferReadOneMsg: read msg[%d] buf fail!", i);
        return HDF_ERR_IO;
    } else {
        msgs[i].buf = buf;
        msgs[i].len = len;
    }
    return HDF_SUCCESS;
}

static int32_t I2cTransferRebuildMsgs(struct HdfSBuf *data, struct I2cMsg *msgs, int16_t count, uint8_t **ppbuf)
{
    int16_t i;
    int32_t ret;
    uint32_t lenReply = 0;
    uint8_t *buf = NULL;
    uint8_t *bufReply = NULL;

    for (i = 0; i < count; i++) {
        ret = I2cTransferReadOneMsg(data, msgs, i, &lenReply);
        if (ret != HDF_SUCCESS) {
            return ret;
        }
    }
    HDF_LOGV("I2cTransferRebuildMsgs: count:%hd, sizeof(*msgs):%u", count, sizeof(*msgs));

    if (lenReply > 0) {
        bufReply = OsalMemCalloc(lenReply);
        if (bufReply == NULL) {
            return HDF_ERR_MALLOC_FAIL;
        }
        for (i = 0, buf = bufReply; i < count && buf < (bufReply + lenReply); i++) {
            if ((msgs[i].flags & I2C_FLAG_READ) != 0) {
                msgs[i].buf = buf;
                buf += msgs[i].len;
            }
        }
    }

    *ppbuf = bufReply;
    return HDF_SUCCESS;
}

static int32_t I2cTransferWriteBackMsgs(struct HdfSBuf *reply, struct I2cMsg *msgs, int16_t count)
{
    int16_t i;

    for (i = 0; i < count; i++) {
        if ((msgs[i].flags & I2C_FLAG_READ) == 0) {
            continue;
        }
        if (!HdfSbufWriteBuffer(reply, msgs[i].buf, msgs[i].len)) {
            HDF_LOGE("I2cTransferWriteBackMsgs: write msg[%d] reply fail!", i);
            return HDF_ERR_IO;
        }
    }

    return HDF_SUCCESS;
}

static int32_t I2cManagerIoTransfer(struct HdfSBuf *data, struct HdfSBuf *reply)
{
    int32_t ret;
    int16_t count;
    int16_t number;
    uint32_t handle;
    uint8_t *bufReply = NULL;
    struct I2cMsg *msgs = NULL;

    if (data == NULL || reply == NULL) {
        return HDF_ERR_INVALID_PARAM;
    }

    if (!HdfSbufReadUint32(data, &handle)) {
        HDF_LOGE("I2cManagerIoTransfer: read handle fail!");
        return HDF_ERR_IO;
    }
    number = (int16_t)(handle - I2C_HANDLE_SHIFT);

    if (!HdfSbufReadInt16(data, &count)) {
        HDF_LOGE("I2cManagerIoTransfer: read count fail!");
        return HDF_ERR_IO;
    }

    msgs = OsalMemCalloc(sizeof(struct I2cMsg) * count);
    if (msgs == NULL) {
        HDF_LOGE("I2cManagerIoTransfer: malloc msgs fail");
        return HDF_ERR_MALLOC_FAIL;
    }

    ret = I2cTransferRebuildMsgs(data, msgs, count, &bufReply);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("I2cManagerIoTransfer: rebuild msgs fail:%d", ret);
        OsalMemFree(msgs);
        return ret;
    }

    ret = I2cCntlrTransfer(I2cManagerFindCntlr(number), msgs, count);
    if (ret != count) {
        OsalMemFree(msgs);
        OsalMemFree(bufReply);
        return ret;
    }
    ret = I2cTransferWriteBackMsgs(reply, msgs, count);
    OsalMemFree(msgs);
    OsalMemFree(bufReply);

    return ret;
}

static int32_t I2cManagerIoOpen(struct HdfSBuf *data, struct HdfSBuf *reply)
{
    int16_t number;
    uint32_t handle;

    if (!HdfSbufReadUint16(data, (uint16_t *)&number)) {
        return HDF_ERR_IO;
    }

    if (number < 0 || number >= I2C_BUS_MAX || reply == NULL) {
        return HDF_ERR_INVALID_PARAM;
    }

    if (I2cCntlrGet(number) == NULL) {
        return HDF_ERR_NOT_SUPPORT;
    }

    handle = (uint32_t)(number + I2C_HANDLE_SHIFT);
    if (!HdfSbufWriteUint32(reply, handle)) {
        return HDF_ERR_IO;
    }
    return HDF_SUCCESS;
}

static int32_t I2cManagerIoClose(struct HdfSBuf *data, struct HdfSBuf *reply)
{
    int16_t number;
    uint32_t handle;

    if (!HdfSbufReadUint32(data, &handle)) {
        return HDF_ERR_IO;
    }

    number  = (int16_t)(handle - I2C_HANDLE_SHIFT);
    if (number < 0 || number >= I2C_BUS_MAX) {
        return HDF_ERR_INVALID_PARAM;
    }
    I2cCntlrPut(I2cManagerFindCntlr(number));
    return HDF_SUCCESS;
}

static int32_t I2cManagerDispatch(struct HdfDeviceIoClient *client, int cmd,
    struct HdfSBuf *data, struct HdfSBuf *reply)
{
    int32_t ret;

    switch (cmd) {
        case I2C_IO_OPEN:
            return I2cManagerIoOpen(data, reply);
        case I2C_IO_CLOSE:
            return I2cManagerIoClose(data, reply);
        case I2C_IO_TRANSFER:
            return I2cManagerIoTransfer(data, reply);
        default:
            ret = HDF_ERR_NOT_SUPPORT;
            break;
    }
    return ret;
}

static int32_t I2cManagerBind(struct HdfDeviceObject *device)
{
    int32_t ret;
    struct I2cManager *manager = NULL;

    HDF_LOGI("I2cManagerBind: Enter!");
    if (device == NULL) {
        HDF_LOGE("I2cManagerBind: device is NULL");
        return HDF_ERR_INVALID_OBJECT;
    }

    manager = (struct I2cManager *)OsalMemCalloc(sizeof(*manager));
    if (manager == NULL) {
        HDF_LOGE("I2cManagerBind: malloc manager fail!");
        return HDF_ERR_MALLOC_FAIL;
    }

    ret = OsalMutexInit(&manager->lock);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("I2cManagerBind: mutex init fail:%d", ret);
        OsalMemFree(manager);
        return HDF_FAILURE;
    }

    manager->device = device;
    device->service = &manager->service;
    device->service->Dispatch = I2cManagerDispatch;
    g_i2cManager = manager;
    return HDF_SUCCESS;
}

static int32_t I2cManagerInit(struct HdfDeviceObject *device)
{
    (void)device;
    return HDF_SUCCESS;
}

static void I2cManagerRelease(struct HdfDeviceObject *device)
{
    struct I2cManager *manager = NULL;

    HDF_LOGI("I2cManagerRelease: enter");
    if (device == NULL) {
        HDF_LOGI("I2cManagerRelease: device is null");
        return;
    }
    manager = (struct I2cManager *)device->service;
    if (manager == NULL) {
        HDF_LOGI("I2cManagerRelease: no service binded!");
        return;
    }
    g_i2cManager = NULL;
    OsalMemFree(manager);
}

struct HdfDriverEntry g_i2cManagerEntry = {
    .moduleVersion = 1,
    .Bind = I2cManagerBind,
    .Init = I2cManagerInit,
    .Release = I2cManagerRelease,
    .moduleName = "HDF_PLATFORM_I2C_MANAGER",
};
HDF_INIT(g_i2cManagerEntry);