incubator-nuttx/drivers/net/ksz9477_i2c.c

112 lines
3.6 KiB
C

/****************************************************************************
* drivers/net/ksz9477_i2c.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 <nuttx/config.h>
#include <nuttx/net/ksz9477.h>
#include <stdbool.h>
#include <errno.h>
#include "ksz9477_reg.h"
/****************************************************************************
* Private Data
****************************************************************************/
static struct i2c_master_s *g_ksz9477_i2c_bus;
/****************************************************************************
* Private Functions
****************************************************************************/
static void setup_i2c_transfer(struct i2c_msg_s *msg, uint8_t *data,
size_t len, bool read)
{
msg[0].frequency = KSZ9477_I2C_SPEED;
msg[0].addr = KSZ9477_I2C_ADDRESS;
msg[0].flags = read ? I2C_M_READ : 0;
msg[0].buffer = data;
msg[0].length = len;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int ksz9477_read(struct ksz9477_transfer_s *read_msg)
{
struct i2c_msg_s msg[2];
/* Set up to write the address */
setup_i2c_transfer(&msg[0], (uint8_t *)&read_msg->reg,
sizeof(read_msg->reg), false);
/* Followed by the read data */
setup_i2c_transfer(&msg[1], (uint8_t *)&read_msg->data,
read_msg->len - sizeof(read_msg->reg), true);
return I2C_TRANSFER(g_ksz9477_i2c_bus, msg, 2);
}
int ksz9477_write(struct ksz9477_transfer_s *write_msg)
{
struct i2c_msg_s msg;
/* Set up to write the address and data */
setup_i2c_transfer(&msg, (uint8_t *)&write_msg->reg,
write_msg->len, false);
return I2C_TRANSFER(g_ksz9477_i2c_bus, &msg, 1);
}
/****************************************************************************
* Name: ksz9477_i2c_init
*
* Description:
* Stores the configured i2c_master and calls the main init function
*
* Input Parameters:
* i2c_bus: The i2c master used as a control interface
* master_port: The switch port connected to the host MAC
* Returned Value:
* OK or negative error number
*
****************************************************************************/
int ksz9477_i2c_init(struct i2c_master_s *i2c_bus,
ksz9477_port_t master_port)
{
if (!i2c_bus)
{
return -EINVAL;
}
g_ksz9477_i2c_bus = i2c_bus;
/* Call the main init function */
return ksz9477_init(master_port);
}