147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 2006-2021, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2012-04-25 weety first version
|
|
* 2014-08-03 bernard fix some compiling warning
|
|
* 2021-04-20 RiceChen added support for bus clock control
|
|
*/
|
|
|
|
#include <rtdevice.h>
|
|
|
|
#define DBG_TAG "I2C"
|
|
#ifdef RT_I2C_DEBUG
|
|
#define DBG_LVL DBG_LOG
|
|
#else
|
|
#define DBG_LVL DBG_INFO
|
|
#endif
|
|
#include <rtdbg.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);
|
|
|
|
LOG_D("I2C bus dev [%s] reading %u bytes.", dev->parent.name, count);
|
|
|
|
addr = pos & 0xffff;
|
|
flags = (pos >> 16) & 0xffff;
|
|
|
|
return rt_i2c_master_recv(bus, addr, flags, (rt_uint8_t *)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);
|
|
|
|
LOG_D("I2C bus dev [%s] writing %u bytes.", dev->parent.name, count);
|
|
|
|
addr = pos & 0xffff;
|
|
flags = (pos >> 16) & 0xffff;
|
|
|
|
return rt_i2c_master_send(bus, addr, flags, (const rt_uint8_t *)buffer, count);
|
|
}
|
|
|
|
static rt_err_t i2c_bus_device_control(rt_device_t dev,
|
|
int 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_uint32_t bus_clock;
|
|
|
|
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_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;
|
|
case RT_I2C_DEV_CTRL_CLK:
|
|
bus_clock = *(rt_uint32_t *)args;
|
|
ret = rt_i2c_control(bus, cmd, bus_clock);
|
|
if (ret < 0)
|
|
{
|
|
return -RT_EIO;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
#ifdef RT_USING_DEVICE_OPS
|
|
const static struct rt_device_ops i2c_ops =
|
|
{
|
|
RT_NULL,
|
|
RT_NULL,
|
|
RT_NULL,
|
|
i2c_bus_device_read,
|
|
i2c_bus_device_write,
|
|
i2c_bus_device_control
|
|
};
|
|
#endif
|
|
|
|
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 */
|
|
#ifdef RT_USING_DEVICE_OPS
|
|
device->ops = &i2c_ops;
|
|
#else
|
|
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;
|
|
#endif
|
|
|
|
/* register to device manager */
|
|
rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
|
|
|
|
return RT_EOK;
|
|
}
|