112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/****************************************************************************
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* drivers/net/ksz9477_i2c.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/net/ksz9477.h>
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#include <stdbool.h>
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#include <errno.h>
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#include "ksz9477_reg.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static struct i2c_master_s *g_ksz9477_i2c_bus;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void setup_i2c_transfer(struct i2c_msg_s *msg, uint8_t *data,
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size_t len, bool read)
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{
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msg[0].frequency = KSZ9477_I2C_SPEED;
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msg[0].addr = KSZ9477_I2C_ADDRESS;
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msg[0].flags = read ? I2C_M_READ : 0;
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msg[0].buffer = data;
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msg[0].length = len;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int ksz9477_read(struct ksz9477_transfer_s *read_msg)
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{
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struct i2c_msg_s msg[2];
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/* Set up to write the address */
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setup_i2c_transfer(&msg[0], (uint8_t *)&read_msg->reg,
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sizeof(read_msg->reg), false);
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/* Followed by the read data */
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setup_i2c_transfer(&msg[1], (uint8_t *)&read_msg->data,
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read_msg->len - sizeof(read_msg->reg), true);
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return I2C_TRANSFER(g_ksz9477_i2c_bus, msg, 2);
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}
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int ksz9477_write(struct ksz9477_transfer_s *write_msg)
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{
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struct i2c_msg_s msg;
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/* Set up to write the address and data */
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setup_i2c_transfer(&msg, (uint8_t *)&write_msg->reg,
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write_msg->len, false);
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return I2C_TRANSFER(g_ksz9477_i2c_bus, &msg, 1);
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}
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/****************************************************************************
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* Name: ksz9477_i2c_init
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*
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* Description:
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* Stores the configured i2c_master and calls the main init function
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*
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* Input Parameters:
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* i2c_bus: The i2c master used as a control interface
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* master_port: The switch port connected to the host MAC
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* Returned Value:
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* OK or negative error number
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*
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****************************************************************************/
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int ksz9477_i2c_init(struct i2c_master_s *i2c_bus,
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ksz9477_port_t master_port)
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{
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if (!i2c_bus)
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{
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return -EINVAL;
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}
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g_ksz9477_i2c_bus = i2c_bus;
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/* Call the main init function */
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return ksz9477_init(master_port);
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}
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