rt-thread/components/dfs/filesystems/devfs/console.c

/*
 * RT-Thread Console Device File
 *
 */
#include <rtthread.h>

struct console_device
{
	struct rt_device parent;

	rt_device_t device; /* the actual device */
};
struct console_device _console;

/* common device interface */
static rt_err_t console_init(rt_device_t dev)
{
	return RT_EOK;
}

static rt_err_t console_open(rt_device_t dev, rt_uint16_t oflag)
{
	return RT_EOK;
}

static rt_err_t console_close(rt_device_t dev)
{
	return RT_EOK;
}

static rt_size_t console_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
	struct console_device* device;

	device = (struct console_device*)dev;
	RT_ASSERT(device != RT_NULL);

	return rt_device_read(device->device, pos, buffer, size);
}

static rt_size_t console_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
	struct console_device* device;

	device = (struct console_device*)dev;
	RT_ASSERT(device != RT_NULL);

	return rt_device_write(device->device, pos, buffer, size);
}

static rt_err_t console_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
	return rt_device_control(_console.device, cmd, args);
}

void rt_console_init(const char* device_name)
{
	rt_device_t device;
	/* register to device framework */

	device = rt_device_find(device_name);
	if (device != RT_NULL)
	{
		struct console_device* console;
		/* get console device */
		console = &_console;
		rt_memset(console, 0, sizeof(_console));

		/* device initialization */
		console->parent.type = RT_Device_Class_Char;
		/* set device interface */
		console->parent.init 	= console_init;
		console->parent.open 	= console_open;
		console->parent.close   = console_close;
		console->parent.read 	= console_read;
		console->parent.write   = console_write;
		console->parent.control	= RT_NULL;
		console->parent.user_data = RT_NULL;

		console->device = device;

		rt_device_register(&console->parent, "console", RT_DEVICE_FLAG_RDWR);
	}
}