548 lines
14 KiB
C
548 lines
14 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2007-01-21 Bernard the first version
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* 2010-05-04 Bernard add rt_device_init implementation
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* 2012-10-20 Bernard add device check in register function,
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* provided by Rob <rdent@iinet.net.au>
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* 2012-12-25 Bernard return RT_EOK if the device interface not exist.
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* 2013-07-09 Grissiom add ref_count support
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* 2016-04-02 Bernard fix the open_flag initialization issue.
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* 2021-03-19 Meco Man remove rt_device_init_all()
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*/
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#include <rtthread.h>
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#ifdef RT_USING_POSIX_DEVIO
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#include <rtdevice.h> /* for wqueue_init */
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#endif /* RT_USING_POSIX_DEVIO */
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#ifdef RT_USING_DEVICE
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#ifdef RT_USING_DEVICE_OPS
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#define device_init (dev->ops->init)
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#define device_open (dev->ops->open)
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#define device_close (dev->ops->close)
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#define device_read (dev->ops->read)
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#define device_write (dev->ops->write)
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#define device_control (dev->ops->control)
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#else
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#define device_init (dev->init)
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#define device_open (dev->open)
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#define device_close (dev->close)
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#define device_read (dev->read)
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#define device_write (dev->write)
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#define device_control (dev->control)
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#endif /* RT_USING_DEVICE_OPS */
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/**
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* @brief This function registers a device driver with a specified name.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param name is the device driver's name.
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*
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* @param flags is the capabilities flag of device.
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*
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* @return the error code, RT_EOK on initialization successfully.
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*/
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rt_err_t rt_device_register(rt_device_t dev,
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const char *name,
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rt_uint16_t flags)
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{
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if (dev == RT_NULL)
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return -RT_ERROR;
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if (rt_device_find(name) != RT_NULL)
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return -RT_ERROR;
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rt_object_init(&(dev->parent), RT_Object_Class_Device, name);
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dev->flag = flags;
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dev->ref_count = 0;
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dev->open_flag = 0;
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#ifdef RT_USING_POSIX_DEVIO
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dev->fops = RT_NULL;
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rt_wqueue_init(&(dev->wait_queue));
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#endif /* RT_USING_POSIX_DEVIO */
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return RT_EOK;
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}
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RTM_EXPORT(rt_device_register);
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/**
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* @brief This function removes a previously registered device driver.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @return the error code, RT_EOK on successfully.
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*/
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rt_err_t rt_device_unregister(rt_device_t dev)
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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RT_ASSERT(rt_object_is_systemobject(&dev->parent));
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rt_object_detach(&(dev->parent));
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return RT_EOK;
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}
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RTM_EXPORT(rt_device_unregister);
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/**
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* @brief This function finds a device driver by specified name.
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*
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* @param name is the device driver's name.
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*
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* @return the registered device driver on successful, or RT_NULL on failure.
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*/
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rt_device_t rt_device_find(const char *name)
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{
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return (rt_device_t)rt_object_find(name, RT_Object_Class_Device);
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}
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RTM_EXPORT(rt_device_find);
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#ifdef RT_USING_HEAP
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/**
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* @brief This function creates a device object with user data size.
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*
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* @param type is the type of the device object.
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*
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* @param attach_size is the size of user data.
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*
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* @return the allocated device object, or RT_NULL when failed.
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*/
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rt_device_t rt_device_create(int type, int attach_size)
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{
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int size;
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rt_device_t device;
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size = RT_ALIGN(sizeof(struct rt_device), RT_ALIGN_SIZE);
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attach_size = RT_ALIGN(attach_size, RT_ALIGN_SIZE);
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/* use the total size */
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size += attach_size;
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device = (rt_device_t)rt_malloc(size);
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if (device)
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{
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rt_memset(device, 0x0, sizeof(struct rt_device));
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device->type = (enum rt_device_class_type)type;
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}
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return device;
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}
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RTM_EXPORT(rt_device_create);
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/**
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* @brief This function destroy the specific device object.
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*
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* @param dev is a specific device object.
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*/
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void rt_device_destroy(rt_device_t dev)
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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RT_ASSERT(rt_object_is_systemobject(&dev->parent) == RT_FALSE);
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rt_object_detach(&(dev->parent));
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/* release this device object */
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rt_free(dev);
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}
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RTM_EXPORT(rt_device_destroy);
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#endif /* RT_USING_HEAP */
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/**
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* @brief This function will initialize the specified device.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @return the result, RT_EOK on successfully.
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*/
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rt_err_t rt_device_init(rt_device_t dev)
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{
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rt_err_t result = RT_EOK;
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RT_ASSERT(dev != RT_NULL);
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/* get device_init handler */
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if (device_init != RT_NULL)
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{
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if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
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{
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result = device_init(dev);
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if (result != RT_EOK)
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{
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RT_DEBUG_LOG(RT_DEBUG_DEVICE, ("To initialize device:%s failed. The error code is %d\n",
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dev->parent.name, result));
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}
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else
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{
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dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
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}
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}
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}
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return result;
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}
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/**
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* @brief This function will open a device.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param oflag is the flags for device open.
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*
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* @return the result, RT_EOK on successfully.
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*/
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rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
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{
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rt_err_t result = RT_EOK;
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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/* if device is not initialized, initialize it. */
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if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
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{
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if (device_init != RT_NULL)
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{
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result = device_init(dev);
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if (result != RT_EOK)
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{
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RT_DEBUG_LOG(RT_DEBUG_DEVICE, ("To initialize device:%s failed. The error code is %d\n",
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dev->parent.name, result));
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return result;
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}
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}
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dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
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}
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/* device is a stand alone device and opened */
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if ((dev->flag & RT_DEVICE_FLAG_STANDALONE) &&
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(dev->open_flag & RT_DEVICE_OFLAG_OPEN))
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{
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return -RT_EBUSY;
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}
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/* device is not opened or opened by other oflag, call device_open interface */
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if (!(dev->open_flag & RT_DEVICE_OFLAG_OPEN) ||
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((dev->open_flag & RT_DEVICE_OFLAG_MASK) != (oflag & RT_DEVICE_OFLAG_MASK)))
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{
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if (device_open != RT_NULL)
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{
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result = device_open(dev, oflag);
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}
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else
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{
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/* set open flag */
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dev->open_flag = (oflag & RT_DEVICE_OFLAG_MASK);
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}
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}
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/* set open flag */
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if (result == RT_EOK || result == -RT_ENOSYS)
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{
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dev->open_flag |= RT_DEVICE_OFLAG_OPEN;
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dev->ref_count++;
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/* don't let bad things happen silently. If you are bitten by this assert,
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* please set the ref_count to a bigger type. */
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RT_ASSERT(dev->ref_count != 0);
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}
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return result;
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}
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RTM_EXPORT(rt_device_open);
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/**
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* @brief This function will close a device.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @return the result, RT_EOK on successfully.
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*/
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rt_err_t rt_device_close(rt_device_t dev)
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{
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rt_err_t result = RT_EOK;
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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if (dev->ref_count == 0)
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return -RT_ERROR;
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dev->ref_count--;
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if (dev->ref_count != 0)
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return RT_EOK;
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/* call device_close interface */
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if (device_close != RT_NULL)
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{
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result = device_close(dev);
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}
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/* set open flag */
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if (result == RT_EOK || result == -RT_ENOSYS)
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dev->open_flag = RT_DEVICE_OFLAG_CLOSE;
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return result;
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}
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RTM_EXPORT(rt_device_close);
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/**
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* @brief This function will read some data from a device.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param pos is the position when reading.
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*
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* @param buffer is a data buffer to save the read data.
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*
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* @param size is the size of buffer.
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*
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* @return the actually read size on successful, otherwise 0 will be returned.
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*
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* @note the unit of size/pos is a block for block device.
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*/
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rt_ssize_t rt_device_read(rt_device_t dev,
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rt_off_t pos,
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void *buffer,
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rt_size_t size)
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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if (dev->ref_count == 0)
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{
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rt_set_errno(-RT_ERROR);
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return 0;
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}
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/* call device_read interface */
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if (device_read != RT_NULL)
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{
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return device_read(dev, pos, buffer, size);
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}
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/* set error code */
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rt_set_errno(-RT_ENOSYS);
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return 0;
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}
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RTM_EXPORT(rt_device_read);
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/**
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* @brief This function will write some data to a device.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param pos is the position when writing.
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*
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* @param buffer is the data buffer to be written to device.
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*
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* @param size is the size of buffer.
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*
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* @return the actually written size on successful, otherwise 0 will be returned.
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*
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* @note the unit of size/pos is a block for block device.
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*/
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rt_ssize_t rt_device_write(rt_device_t dev,
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rt_off_t pos,
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const void *buffer,
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rt_size_t size)
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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if (dev->ref_count == 0)
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{
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rt_set_errno(-RT_ERROR);
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return 0;
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}
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/* call device_write interface */
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if (device_write != RT_NULL)
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{
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return device_write(dev, pos, buffer, size);
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}
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/* set error code */
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rt_set_errno(-RT_ENOSYS);
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return 0;
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}
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RTM_EXPORT(rt_device_write);
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/**
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* @brief This function will perform a variety of control functions on devices.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param cmd is the command sent to device.
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*
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* @param arg is the argument of command.
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*
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* @return the result, -RT_ENOSYS for failed.
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*/
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rt_err_t rt_device_control(rt_device_t dev, int cmd, void *arg)
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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/* call device_write interface */
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if (device_control != RT_NULL)
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{
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return device_control(dev, cmd, arg);
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}
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return -RT_ENOSYS;
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}
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RTM_EXPORT(rt_device_control);
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/**
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* @brief This function will set the reception indication callback function. This callback function
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* is invoked when this device receives data.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param rx_ind is the indication callback function.
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*
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* @return RT_EOK
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*/
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rt_err_t rt_device_set_rx_indicate(rt_device_t dev,
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rt_err_t (*rx_ind)(rt_device_t dev,
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rt_size_t size))
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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dev->rx_indicate = rx_ind;
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return RT_EOK;
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}
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RTM_EXPORT(rt_device_set_rx_indicate);
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/**
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* @brief This function will set a callback function. The callback function
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* will be called when device has written data to physical hardware.
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*
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* @param dev is the pointer of device driver structure.
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*
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* @param tx_done is the indication callback function.
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*
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* @return RT_EOK
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*/
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rt_err_t rt_device_set_tx_complete(rt_device_t dev,
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rt_err_t (*tx_done)(rt_device_t dev,
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void *buffer))
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{
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/* parameter check */
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);
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dev->tx_complete = tx_done;
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return RT_EOK;
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}
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RTM_EXPORT(rt_device_set_tx_complete);
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#ifdef RT_USING_DM
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/**
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* This function bind drvier and device
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*
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* @param device the pointer of device structure
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* @param driver the pointer of driver structure
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* @param node the pointer of fdt node structure
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*
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* @return the error code, RT_EOK on successfully.
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*/
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rt_err_t rt_device_bind_driver(rt_device_t device, rt_driver_t driver, void *node)
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{
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if((!driver) || (!device))
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{
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return -RT_EINVAL;
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}
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device->drv = driver;
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#ifdef RT_USING_DEVICE_OPS
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device->ops = driver->dev_ops;
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#endif
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device->dtb_node = node;
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return RT_EOK;
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}
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RTM_EXPORT(rt_device_bind_driver);
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/**
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* This function create rt_device according to driver infomation
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*
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* @param drv the pointer of driver structure
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* @param device_id specify the ID of the rt_device
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*
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* @return the error code, RT_EOK on successfully.
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*/
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rt_device_t rt_device_create_since_driver(rt_driver_t drv,int device_id)
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{
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rt_device_t device;
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if (!drv)
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{
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return RT_NULL;
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}
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device = (rt_device_t)rt_calloc(1,drv->device_size);
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if(device == RT_NULL)
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{
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return RT_NULL;
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}
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device->device_id = device_id;
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rt_snprintf(device->parent.name, sizeof(device->parent.name), "%s%d", drv->name, device_id);
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return device;
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}
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RTM_EXPORT(rt_device_create_since_driver);
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/**
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* This function rt_device probe and init
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*
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* @param device the pointer of rt_device structure
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* @return the error code, RT_EOK on successfully.
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*/
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rt_err_t rt_device_probe_and_init(rt_device_t device)
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{
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int ret = -RT_ERROR;
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if (!device)
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{
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return -RT_EINVAL;
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}
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if(!device->drv)
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{
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return -RT_ERROR;
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}
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if(device->drv->probe)
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{
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ret = device->drv->probe((rt_device_t)device);
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}
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if(device->drv->probe_init)
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{
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ret = device->drv->probe_init((rt_device_t)device);
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}
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return ret;
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}
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RTM_EXPORT(rt_device_probe_and_init);
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#endif /* RT_USING_DM */
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#endif /* RT_USING_DEVICE */
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