xiaoxiang781216 commented on a change in pull request #2158: URL: https://github.com/apache/incubator-nuttx/pull/2158#discussion_r516798137
########## File path: arch/sim/src/sim/up_i2cbuslinux.c ########## @@ -0,0 +1,288 @@ +/**************************************************************************** + * arch/sim/src/sim/up_i2cbuslinux.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <sys/types.h> +#include <sys/ioctl.h> + +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <fcntl.h> + +#include <linux/i2c-dev.h> +#include <linux/i2c.h> + +#include "up_i2cbus.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#define ERROR(fmt, ...) \ + syslog(LOG_ERR, "up_i2cbuslinux: " fmt "\n", ##__VA_ARGS__) +#define INFO(fmt, ...) \ + syslog(LOG_ERR, "up_i2cbuslinux: " fmt "\n", ##__VA_ARGS__) +#define DEBUG(fmt, ...) + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct linux_i2cbus_master_s +{ + const struct i2c_ops_s *ops; /* I2C vtable */ + int file; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +int linux_i2cbus_transfer_host(struct i2c_master_s *dev, + struct i2c_msg_s *msgs, int count); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +struct i2c_ops_s i2c_linux_ops = +{ + .transfer = linux_i2cbus_transfer_host, +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: linux_i2cbus_transfer_host + * + * Description: + * Provide i2c transfer + * + ****************************************************************************/ + +int linux_i2cbus_transfer_host(struct i2c_master_s *dev, + struct i2c_msg_s *msgs, int count) +{ + int ret = 0; + struct linux_i2cbus_master_s *priv = (struct linux_i2cbus_master_s *)dev; + int file = priv->file; + uint8_t *pack_buf = NULL; + struct i2c_rdwr_ioctl_data ioctl_data; + struct i2c_msg l_msgs[2]; /* We only support up to 2 messages */ Review comment: Yes, but we should support as much as possible(e.g. any message count and avoid buffer copy) ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
