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/*
* File : fm24clxx.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2017-07-14 aubr.cool 1st version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "fm24clxx.h"
struct fm24clxx_device
{
struct rt_device parent;
struct rt_i2c_bus_device *bus;
};
/* RT-Thread device interface */
static rt_err_t fm24clxx_init(rt_device_t dev)
{
return RT_EOK;
}
static rt_err_t fm24clxx_open(rt_device_t dev, rt_uint16_t oflag)
{
return RT_EOK;
}
static rt_err_t fm24clxx_close(rt_device_t dev)
{
return RT_EOK;
}
static rt_err_t fm24clxx_control(rt_device_t dev, int cmd, void *args)
{
return RT_EOK;
}
static rt_size_t fm24clxx_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
struct fm24clxx_device *fm24clxx;
const struct fm24clxx_config *cfg;
struct rt_i2c_msg msg[2];
rt_uint8_t mem_addr[2] = {0,};
rt_size_t ret = 0;
RT_ASSERT(dev != 0);
fm24clxx = (struct fm24clxx_device *) dev;
RT_ASSERT(fm24clxx->parent.user_data != 0);
cfg = (const struct fm24clxx_config *) fm24clxx->parent.user_data;
if(pos > cfg->size)
{
return 0;
}
if(pos + size > cfg->size)
{
size = cfg->size - pos;
}
msg[0].addr = cfg->addr;
msg[0].flags = cfg->flags | RT_I2C_WR;
mem_addr[0] = (pos >> 8);
mem_addr[1] = (rt_uint8_t) pos;
msg[0].buf = (rt_uint8_t *) mem_addr;
msg[0].len = 2;
msg[1].addr = cfg->addr;
msg[1].flags = cfg->flags | RT_I2C_RD;
msg[1].buf = (rt_uint8_t *) buffer;
msg[1].len = size;
ret = rt_i2c_transfer(fm24clxx->bus, msg, 2);
return (ret == 2) ? size : 0;
}
static rt_size_t fm24clxx_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
struct fm24clxx_device *fm24clxx;
const struct fm24clxx_config *cfg;
struct rt_i2c_msg msg[2];
rt_uint8_t mem_addr[2] = {0,};
rt_size_t ret = 0;
RT_ASSERT(dev != 0);
fm24clxx = (struct fm24clxx_device *) dev;
RT_ASSERT(fm24clxx->parent.user_data != 0);
cfg = (const struct fm24clxx_config *) fm24clxx->parent.user_data;
if(pos > cfg->size)
{
return 0;
}
if(pos + size > cfg->size)
{
size = cfg->size - pos;
}
msg[0].addr = cfg->addr;
msg[0].flags = cfg->flags | RT_I2C_WR;
mem_addr[0] = (pos >> 8);
mem_addr[1] = (rt_uint8_t) pos;
msg[0].buf = (rt_uint8_t *) mem_addr;
msg[0].len = 2;
msg[1].addr = cfg->addr;
msg[1].flags = cfg->flags | RT_I2C_WR | RT_I2C_NO_START;
msg[1].buf = (rt_uint8_t *) buffer;
msg[1].len = size;
ret = rt_i2c_transfer(fm24clxx->bus, msg, 2);
return (ret == 2) ? size : 0;
}
rt_err_t fm24clxx_register(const char *fm_device_name, const char *i2c_bus, void *user_data)
{
static struct fm24clxx_device fm24clxx_drv;
struct rt_i2c_bus_device *bus;
bus = rt_i2c_bus_device_find(i2c_bus);
if (bus == RT_NULL)
{
return RT_ENOSYS;
}
fm24clxx_drv.bus = bus;
fm24clxx_drv.parent.type = RT_Device_Class_Block;
fm24clxx_drv.parent.init = fm24clxx_init;
fm24clxx_drv.parent.open = fm24clxx_open;
fm24clxx_drv.parent.close = fm24clxx_close;
fm24clxx_drv.parent.read = fm24clxx_read;
fm24clxx_drv.parent.write = fm24clxx_write;
fm24clxx_drv.parent.control = fm24clxx_control;
fm24clxx_drv.parent.user_data = user_data;
return rt_device_register(&fm24clxx_drv.parent, fm_device_name, RT_DEVICE_FLAG_RDWR);
}
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