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rt-thread/src/device.c

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/*
* File : device.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2013, 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
* 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.
* 2013-07-09 Grissiom add ref_count support
* 2016-04-02 Bernard fix the open_flag initialization issue.
*/
#include <rtthread.h>
#if defined(RT_USING_POSIX)
#include <rtdevice.h> /* for wqueue_init */
#endif
#ifdef RT_USING_DEVICE
#ifdef RT_USING_DEVICE_OPS
#define device_init (dev->ops->init)
#define device_open (dev->ops->open)
#define device_close (dev->ops->close)
#define device_read (dev->ops->read)
#define device_write (dev->ops->write)
#define device_control (dev->ops->control)
#else
#define device_init (dev->init)
#define device_open (dev->open)
#define device_close (dev->close)
#define device_read (dev->read)
#define device_write (dev->write)
#define device_control (dev->control)
#endif
/**
* 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 capabilities 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;
dev->ref_count = 0;
dev->open_flag = 0;
#if defined(RT_USING_POSIX)
dev->fops = RT_NULL;
rt_wqueue_init(&(dev->wait_queue));
#endif
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_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
RT_ASSERT(rt_object_is_systemobject(&dev->parent));
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.
*
* @deprecated since 1.2.x, this function is not needed because the initialization
* of a device is performed when applicaiton opens it.
*/
rt_err_t rt_device_init_all(void)
{
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;
/* enter critical */
if (rt_thread_self() != RT_NULL)
rt_enter_critical();
/* try to find device object */
information = rt_object_get_information(RT_Object_Class_Device);
RT_ASSERT(information != RT_NULL);
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);
#ifdef RT_USING_HEAP
/**
* This function creates a device object with user data size.
*
* @param type, the kind type of this device object.
* @param attach_size, the size of user data.
*
* @return the allocated device object, or RT_NULL when failed.
*/
rt_device_t rt_device_create(int type, int attach_size)
{
int size;
rt_device_t device;
size = RT_ALIGN(sizeof(struct rt_device), RT_ALIGN_SIZE);
attach_size = RT_ALIGN(attach_size, RT_ALIGN_SIZE);
/* use the totoal size */
size += attach_size;
device = (rt_device_t)rt_malloc(size);
if (device)
{
rt_memset(device, 0x0, sizeof(struct rt_device));
device->type = (enum rt_device_class_type)type;
}
return device;
}
RTM_EXPORT(rt_device_create);
/**
* This function destroy the specific device object.
*
* @param dev, the specific device object.
*/
void rt_device_destroy(rt_device_t dev)
{
RT_ASSERT(dev != RT_NULL);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
RT_ASSERT(rt_object_is_systemobject(&dev->parent) == RT_FALSE);
rt_object_detach(&(dev->parent));
/* release this device object */
rt_free(dev);
}
RTM_EXPORT(rt_device_destroy);
#endif
/**
* 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 (device_init != RT_NULL)
{
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
result = device_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);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
/* if device is not initialized, initialize it. */
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (device_init != RT_NULL)
{
result = device_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 (device_open != RT_NULL)
{
result = device_open(dev, oflag);
}
else
{
/* set open flag */
dev->open_flag = (oflag & RT_DEVICE_OFLAG_MASK);
}
/* set open flag */
if (result == RT_EOK || result == -RT_ENOSYS)
{
dev->open_flag |= RT_DEVICE_OFLAG_OPEN;
dev->ref_count++;
/* don't let bad things happen silently. If you are bitten by this assert,
* please set the ref_count to a bigger type. */
RT_ASSERT(dev->ref_count != 0);
}
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);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
if (dev->ref_count == 0)
return -RT_ERROR;
dev->ref_count--;
if (dev->ref_count != 0)
return RT_EOK;
/* call device close interface */
if (device_close != RT_NULL)
{
result = device_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);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
if (dev->ref_count == 0)
{
rt_set_errno(-RT_ERROR);
return 0;
}
/* call device read interface */
if (device_read != RT_NULL)
{
return device_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);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
if (dev->ref_count == 0)
{
rt_set_errno(-RT_ERROR);
return 0;
}
/* call device write interface */
if (device_write != RT_NULL)
{
return device_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, int cmd, void *arg)
{
RT_ASSERT(dev != RT_NULL);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
/* call device write interface */
if (device_control != RT_NULL)
{
return device_control(dev, cmd, arg);
}
return -RT_ENOSYS;
}
RTM_EXPORT(rt_device_control);
/**
* This function will set the reception indication callback function. This callback function
* is invoked when this 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);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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);
RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
dev->tx_complete = tx_done;
return RT_EOK;
}
RTM_EXPORT(rt_device_set_tx_complete);
#endif
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