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/*
* File : i2c_dev.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, 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
* 2012-04-25 weety first version
* 2014-08-03 bernard fix some compiling warning
*/
#include <rtdevice.h>
static rt_size_t i2c_bus_device_read(rt_device_t dev,
rt_off_t pos,
void *buffer,
rt_size_t count)
{
rt_uint16_t addr;
rt_uint16_t flags;
struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
RT_ASSERT(bus != RT_NULL);
RT_ASSERT(buffer != RT_NULL);
i2c_dbg("I2C bus dev [%s] reading %u bytes.\n", dev->parent.name, count);
addr = pos & 0xffff;
flags = (pos >> 16) & 0xffff;
return rt_i2c_master_recv(bus, addr, flags, buffer, count);
}
static rt_size_t i2c_bus_device_write(rt_device_t dev,
rt_off_t pos,
const void *buffer,
rt_size_t count)
{
rt_uint16_t addr;
rt_uint16_t flags;
struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
RT_ASSERT(bus != RT_NULL);
RT_ASSERT(buffer != RT_NULL);
i2c_dbg("I2C bus dev writing %u bytes.\n", dev->parent.name, count);
addr = pos & 0xffff;
flags = (pos >> 16) & 0xffff;
return rt_i2c_master_send(bus, addr, flags, buffer, count);
}
static rt_err_t i2c_bus_device_control(rt_device_t dev,
rt_uint8_t cmd,
void *args)
{
rt_err_t ret;
struct rt_i2c_priv_data *priv_data;
struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
RT_ASSERT(bus != RT_NULL);
switch (cmd)
{
/* set 10-bit addr mode */
case RT_I2C_DEV_CTRL_10BIT:
bus->flags |= RT_I2C_ADDR_10BIT;
break;
case RT_I2C_DEV_CTRL_ADDR:
bus->addr = *(rt_uint16_t *)args;
break;
case RT_I2C_DEV_CTRL_TIMEOUT:
bus->timeout = *(rt_uint32_t *)args;
break;
case RT_I2C_DEV_CTRL_RW:
priv_data = (struct rt_i2c_priv_data *)args;
ret = rt_i2c_transfer(bus, priv_data->msgs, priv_data->number);
if (ret < 0)
{
return -RT_EIO;
}
break;
default:
break;
}
return RT_EOK;
}
rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device *bus,
const char *name)
{
struct rt_device *device;
RT_ASSERT(bus != RT_NULL);
device = &bus->parent;
device->user_data = bus;
/* set device type */
device->type = RT_Device_Class_I2CBUS;
/* initialize device interface */
device->init = RT_NULL;
device->open = RT_NULL;
device->close = RT_NULL;
device->read = i2c_bus_device_read;
device->write = i2c_bus_device_write;
device->control = i2c_bus_device_control;
/* register to device manager */
rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
return RT_EOK;
}
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