rt-thread/components/drivers/i2c/i2c_dev.c

#include <rtdevice.h>

static rt_err_t i2c_bus_device_init(rt_device_t dev)
{
    struct rt_i2c_bus_device* bus = (struct rt_i2c_bus_device *)dev->user_data;
    RT_ASSERT(bus != RT_NULL);

    return RT_EOK;
}

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)
    {
    case RT_I2C_DEV_CTRL_10BIT: /* set 10-bit addr mode */
        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	= i2c_bus_device_init;
    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;
}