chinky/rtt-f030
chinky
/
rtt-f030
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
rtt-f030/src/device.c

401 lines
9.8 KiB
C
Raw Blame History

/*
* File : device.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2007-01-21 Bernard the first version
* 2010-05-04 Bernard add rt_device_init implementation
* 2012-10-20 Bernard add device check in register function,
* provided by Rob <rdent@iinet.net.au>
* 2012-12-25 Bernard return RT_EOK if the device interface not exist.
*/
#include <rtthread.h>
#ifdef RT_USING_DEVICE
/**
* This function registers a device driver with specified name.
*
* @param dev the pointer of device driver structure
* @param name the device driver's name
* @param flags the flag of device
*
* @return the error code, RT_EOK on initialization successfully.
*/
rt_err_t rt_device_register(rt_device_t dev,
const char *name,
rt_uint16_t flags)
{
if (dev == RT_NULL)
return -RT_ERROR;
if (rt_device_find(name) != RT_NULL)
return -RT_ERROR;
rt_object_init(&(dev->parent), RT_Object_Class_Device, name);
dev->flag = flags;
return RT_EOK;
}
RTM_EXPORT(rt_device_register);
/**
* This function removes a previously registered device driver
*
* @param dev the pointer of device driver structure
*
* @return the error code, RT_EOK on successfully.
*/
rt_err_t rt_device_unregister(rt_device_t dev)
{
RT_ASSERT(dev != RT_NULL);
rt_object_detach(&(dev->parent));
return RT_EOK;
}
RTM_EXPORT(rt_device_unregister);
/**
* This function initializes all registered device driver
*
* @return the error code, RT_EOK on successfully.
*/
rt_err_t rt_device_init_all(void)
{
struct rt_device *device;
struct rt_list_node *node;
struct rt_object_information *information;
register rt_err_t result;
extern struct rt_object_information rt_object_container[];
information = &rt_object_container[RT_Object_Class_Device];
/* for each device */
for (node = information->object_list.next;
node != &(information->object_list);
node = node->next)
{
rt_err_t (*init)(rt_device_t dev);
device = (struct rt_device *)rt_list_entry(node,
struct rt_object,
list);
/* get device init handler */
init = device->init;
if (init != RT_NULL && !(device->flag & RT_DEVICE_FLAG_ACTIVATED))
{
result = init(device);
if (result != RT_EOK)
{
rt_kprintf("To initialize device:%s failed. The error code is %d\n",
device->parent.name, result);
}
else
{
device->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
}
}
return RT_EOK;
}
/**
* This function finds a device driver by specified name.
*
* @param name the device driver's name
*
* @return the registered device driver on successful, or RT_NULL on failure.
*/
rt_device_t rt_device_find(const char *name)
{
struct rt_object *object;
struct rt_list_node *node;
struct rt_object_information *information;
extern struct rt_object_information rt_object_container[];
/* enter critical */
if (rt_thread_self() != RT_NULL)
rt_enter_critical();
/* try to find device object */
information = &rt_object_container[RT_Object_Class_Device];
for (node = information->object_list.next;
node != &(information->object_list);
node = node->next)
{
object = rt_list_entry(node, struct rt_object, list);
if (rt_strncmp(object->name, name, RT_NAME_MAX) == 0)
{
/* leave critical */
if (rt_thread_self() != RT_NULL)
rt_exit_critical();
return (rt_device_t)object;
}
}
/* leave critical */
if (rt_thread_self() != RT_NULL)
rt_exit_critical();
/* not found */
return RT_NULL;
}
RTM_EXPORT(rt_device_find);
/**
* This function will initialize the specified device
*
* @param dev the pointer of device driver structure
*
* @return the result
*/
rt_err_t rt_device_init(rt_device_t dev)
{
rt_err_t result = RT_EOK;
RT_ASSERT(dev != RT_NULL);
/* get device init handler */
if (dev->init != RT_NULL)
{
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
result = dev->init(dev);
if (result != RT_EOK)
{
rt_kprintf("To initialize device:%s failed. The error code is %d\n",
dev->parent.name, result);
}
else
{
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
}
}
return result;
}
/**
* This function will open a device
*
* @param dev the pointer of device driver structure
* @param oflag the flags for device open
*
* @return the result
*/
rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
{
rt_err_t result = RT_EOK;
RT_ASSERT(dev != RT_NULL);
/* if device is not initialized, initialize it. */
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (dev->init != RT_NULL)
{
result = dev->init(dev);
if (result != RT_EOK)
{
rt_kprintf("To initialize device:%s failed. The error code is %d\n",
dev->parent.name, result);
return result;
}
}
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
/* device is a stand alone device and opened */
if ((dev->flag & RT_DEVICE_FLAG_STANDALONE) &&
(dev->open_flag & RT_DEVICE_OFLAG_OPEN))
{
return -RT_EBUSY;
}
/* call device open interface */
if (dev->open != RT_NULL)
{
result = dev->open(dev, oflag);
}
/* set open flag */
if (result == RT_EOK || result == -RT_ENOSYS)
dev->open_flag = oflag | RT_DEVICE_OFLAG_OPEN;
return result;
}
RTM_EXPORT(rt_device_open);
/**
* This function will close a device
*
* @param dev the pointer of device driver structure
*
* @return the result
*/
rt_err_t rt_device_close(rt_device_t dev)
{
rt_err_t result = RT_EOK;
RT_ASSERT(dev != RT_NULL);
/* call device close interface */
if (dev->close != RT_NULL)
{
result = dev->close(dev);
}
/* set open flag */
if (result == RT_EOK || result == -RT_ENOSYS)
dev->open_flag = RT_DEVICE_OFLAG_CLOSE;
return result;
}
RTM_EXPORT(rt_device_close);
/**
* This function will read some data from a device.
*
* @param dev the pointer of device driver structure
* @param pos the position of reading
* @param buffer the data buffer to save read data
* @param size the size of buffer
*
* @return the actually read size on successful, otherwise negative returned.
*
* @note since 0.4.0, the unit of size/pos is a block for block device.
*/
rt_size_t rt_device_read(rt_device_t dev,
rt_off_t pos,
void *buffer,
rt_size_t size)
{
RT_ASSERT(dev != RT_NULL);
/* call device read interface */
if (dev->read != RT_NULL)
{
return dev->read(dev, pos, buffer, size);
}
/* set error code */
rt_set_errno(-RT_ENOSYS);
return 0;
}
RTM_EXPORT(rt_device_read);
/**
* This function will write some data to a device.
*
* @param dev the pointer of device driver structure
* @param pos the position of written
* @param buffer the data buffer to be written to device
* @param size the size of buffer
*
* @return the actually written size on successful, otherwise negative returned.
*
* @note since 0.4.0, the unit of size/pos is a block for block device.
*/
rt_size_t rt_device_write(rt_device_t dev,
rt_off_t pos,
const void *buffer,
rt_size_t size)
{
RT_ASSERT(dev != RT_NULL);
/* call device write interface */
if (dev->write != RT_NULL)
{
return dev->write(dev, pos, buffer, size);
}
/* set error code */
rt_set_errno(-RT_ENOSYS);
return 0;
}
RTM_EXPORT(rt_device_write);
/**
* This function will perform a variety of control functions on devices.
*
* @param dev the pointer of device driver structure
* @param cmd the command sent to device
* @param arg the argument of command
*
* @return the result
*/
rt_err_t rt_device_control(rt_device_t dev, rt_uint8_t cmd, void *arg)
{
RT_ASSERT(dev != RT_NULL);
/* call device write interface */
if (dev->control != RT_NULL)
{
return dev->control(dev, cmd, arg);
}
return RT_EOK;
}
RTM_EXPORT(rt_device_control);
/**
* This function will set the indication callback function when device receives
* data.
*
* @param dev the pointer of device driver structure
* @param rx_ind the indication callback function
*
* @return RT_EOK
*/
rt_err_t
rt_device_set_rx_indicate(rt_device_t dev,
rt_err_t (*rx_ind)(rt_device_t dev, rt_size_t size))
{
RT_ASSERT(dev != RT_NULL);
dev->rx_indicate = rx_ind;
return RT_EOK;
}
RTM_EXPORT(rt_device_set_rx_indicate);
/**
* This function will set the indication callback function when device has
* written data to physical hardware.
*
* @param dev the pointer of device driver structure
* @param tx_done the indication callback function
*
* @return RT_EOK
*/
rt_err_t
rt_device_set_tx_complete(rt_device_t dev,
rt_err_t (*tx_done)(rt_device_t dev, void *buffer))
{
RT_ASSERT(dev != RT_NULL);
dev->tx_complete = tx_done;
return RT_EOK;
}
RTM_EXPORT(rt_device_set_tx_complete);
#endif
Reference in New Issue View Git Blame Copy Permalink