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rt-thread/src/device.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* 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.
* 2021-03-19 Meco Man remove rt_device_init_all()
*/
#include <rtthread.h>
#ifdef RT_USING_POSIX_DEVIO
#include <rtdevice.h> /* for wqueue_init */
#endif /* RT_USING_POSIX_DEVIO */
#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 /* RT_USING_DEVICE_OPS */
/**
* @brief This function registers a device driver with a specified name.
*
* @param dev is the pointer of device driver structure.
*
* @param name is the device driver's name.
*
* @param flags is 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;
#ifdef RT_USING_POSIX_DEVIO
dev->fops = RT_NULL;
rt_wqueue_init(&(dev->wait_queue));
#endif /* RT_USING_POSIX_DEVIO */
return RT_EOK;
}
RTM_EXPORT(rt_device_register);
/**
* @brief This function removes a previously registered device driver.
*
* @param dev is the pointer of device driver structure.
*
* @return the error code, RT_EOK on successfully.
*/
rt_err_t rt_device_unregister(rt_device_t dev)
{
/* parameter check */
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);
/**
* @brief This function finds a device driver by specified name.
*
* @param name is 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)
{
return (rt_device_t)rt_object_find(name, RT_Object_Class_Device);
}
RTM_EXPORT(rt_device_find);
#ifdef RT_USING_HEAP
/**
* @brief This function creates a device object with user data size.
*
* @param type is the type of the device object.
*
* @param attach_size is 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 total 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);
/**
* @brief This function destroy the specific device object.
*
* @param dev is a specific device object.
*/
void rt_device_destroy(rt_device_t dev)
{
/* parameter check */
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 /* RT_USING_HEAP */
/**
* @brief This function will initialize the specified device.
*
* @param dev is the pointer of device driver structure.
*
* @return the result, RT_EOK on successfully.
*/
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_DEBUG_LOG(RT_DEBUG_DEVICE, ("To initialize device:%s failed. The error code is %d\n",
dev->parent.name, result));
}
else
{
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
}
}
return result;
}
/**
* @brief This function will open a device.
*
* @param dev is the pointer of device driver structure.
*
* @param oflag is the flags for device open.
*
* @return the result, RT_EOK on successfully.
*/
rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
{
rt_err_t result = RT_EOK;
/* parameter check */
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_DEBUG_LOG(RT_DEBUG_DEVICE, ("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);
/**
* @brief This function will close a device.
*
* @param dev is the pointer of device driver structure.
*
* @return the result, RT_EOK on successfully.
*/
rt_err_t rt_device_close(rt_device_t dev)
{
rt_err_t result = RT_EOK;
/* parameter check */
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);
/**
* @brief This function will read some data from a device.
*
* @param dev is the pointer of device driver structure.
*
* @param pos is the position when reading.
*
* @param buffer is a data buffer to save the read data.
*
* @param size is the size of buffer.
*
* @return the actually read size on successful, otherwise 0 will be returned.
*
* @note the unit of size/pos is a block for block device.
*/
rt_ssize_t rt_device_read(rt_device_t dev,
rt_off_t pos,
void *buffer,
rt_size_t size)
{
/* parameter check */
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);
/**
* @brief This function will write some data to a device.
*
* @param dev is the pointer of device driver structure.
*
* @param pos is the position when writing.
*
* @param buffer is the data buffer to be written to device.
*
* @param size is the size of buffer.
*
* @return the actually written size on successful, otherwise 0 will be returned.
*
* @note the unit of size/pos is a block for block device.
*/
rt_ssize_t rt_device_write(rt_device_t dev,
rt_off_t pos,
const void *buffer,
rt_size_t size)
{
/* parameter check */
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);
/**
* @brief This function will perform a variety of control functions on devices.
*
* @param dev is the pointer of device driver structure.
*
* @param cmd is the command sent to device.
*
* @param arg is the argument of command.
*
* @return the result, -RT_ENOSYS for failed.
*/
rt_err_t rt_device_control(rt_device_t dev, int cmd, void *arg)
{
/* parameter check */
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);
/**
* @brief This function will set the reception indication callback function. This callback function
* is invoked when this device receives data.
*
* @param dev is the pointer of device driver structure.
*
* @param rx_ind is 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))
{
/* parameter check */
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);
/**
* @brief This function will set a callback function. The callback function
* will be called when device has written data to physical hardware.
*
* @param dev is the pointer of device driver structure.
*
* @param tx_done is 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))
{
/* parameter check */
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);
#ifdef RT_USING_DM
/**
* This function bind drvier and device
*
* @param driver the pointer of driver structure
* @param device the pointer of device structure
* @param node the pointer of fdt node structure
*
* @return the error code, RT_EOK on successfully.
*/
rt_err_t rt_device_bind_driver(rt_device_t device, rt_driver_t driver, void *node)
{
if((!driver) || (!device))
{
return -RT_EINVAL;
}
device->drv = driver;
#ifdef RT_USING_DEVICE_OPS
device->ops = driver->dev_ops;
#endif
device->dtb_node = node;
return RT_EOK;
}
RTM_EXPORT(rt_device_bind_driver);
/**
* This function create rt_device according to driver infomation
*
* @param drv the pointer of driver structure
* @param device_id specify the ID of the rt_device
*
* @return the error code, RT_EOK on successfully.
*/
rt_device_t rt_device_create_since_driver(rt_driver_t drv,int device_id)
{
rt_device_t device;
if (!drv)
{
return RT_NULL;
}
device = (rt_device_t)rt_calloc(1,drv->device_size);
if(device == RT_NULL)
{
return RT_NULL;
}
device->device_id = device_id;
rt_snprintf(device->parent.name, sizeof(device->parent.name), "%s%d", drv->name, device_id);
return device;
}
RTM_EXPORT(rt_device_create_since_driver);
/**
* This function rt_device probe and init
*
* @param device the pointer of rt_device structure
* @return the error code, RT_EOK on successfully.
*/
rt_err_t rt_device_probe_and_init(rt_device_t device)
{
int ret = -RT_ERROR;
if (!device)
{
return -RT_EINVAL;
}
if(!device->drv)
{
return -RT_ERROR;
}
if(device->drv->probe)
{
ret = device->drv->probe((rt_device_t)device);
}
if(device->drv->probe_init)
{
ret = device->drv->probe_init((rt_device_t)device);
}
return ret;
}
RTM_EXPORT(rt_device_probe_and_init);
#endif /* RT_USING_DM */
#endif /* RT_USING_DEVICE */
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