int vfs_i2c_close(file_t *fp)
{
int ret = -1; /* return value */
i2c_dev_t *i2c_dev = NULL; /* device pointer */
/* check empty pointer. */
if ((fp != NULL) && (fp->node != NULL)) {
/* close device if the device is last closed. */
if (fp->node->refs == 1) {
/* get the device pointer. */
i2c_dev = (i2c_dev_t *)(fp->node->i_arg);
/* lock the device. */
ret = aos_mutex_lock(&fp->node->mutex, AOS_WAIT_FOREVER);
if (ret == 0) {
/* turns off hardware. */
ret = hal_i2c_finalize(i2c_dev);
}
/* unlock the device. */
aos_mutex_unlock(&fp->node->mutex);
} else {
ret = VFS_SUCCESS;
}
} else {
ret = -EINVAL;
}
return ret;
}
static be_jse_symbol_t *i2c_close(void)
{
int8_t ret = -1;
int8_t result = -1;
item_handle_t i2c_handle;
be_jse_symbol_t *arg0 = NULL;
i2c_dev_t *i2c_device = NULL;
be_jse_handle_function(0, &arg0, NULL, NULL, NULL);
if (!arg0 || !symbol_is_int(arg0)) {
goto out;
}
i2c_handle.handle = get_symbol_value_int(arg0);
i2c_device = board_get_node_by_handle(MODULE_I2C, &i2c_handle);
if (NULL == i2c_device) {
be_error("i2c", "board_get_node_by_handle fail!\n");
goto out;
}
ret = hal_i2c_finalize(i2c_device);
if (0 != ret) {
be_error("i2c", "hal_i2c_finalize fail!\n");
goto out;
}
board_disattach_item(MODULE_I2C, &i2c_handle);
result = 0;
out:
symbol_unlock(arg0);
return new_int_symbol(result);
}
result_t i2c_read(i2c_device_t* dev, void* buffer, uint16_t length)
{
uint16_t busId = dev->busId;
uint16_t ret;
if((ret = hal_i2c_set_slave_addr(busId, dev->devAddress)) != RV_OK)
return ret;
if((ret = hal_i2c_setup_interface(busId, dev->baudrate)) != RV_OK)
return ret;
if((ret = hal_i2c_read(busId, buffer, length)) != RV_OK);
return ret;
if((ret = hal_i2c_finalize(busId)) != RV_OK)
return ret;
return RV_OK;
}
