155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/*
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* File : driver.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2011, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2011-03-12 Yi Qiu first version
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*/
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#include <rtthread.h>
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#include <rtservice.h>
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#include <rtdevice.h>
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static rt_list_t _driver_list;
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/**
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* This function will initilize the usb class driver related data structure,
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* and it should be invoked in the usb system initialization.
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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_usbh_class_driver_init(void)
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{
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rt_list_init(&_driver_list);
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return RT_EOK;
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}
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/**
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* This function will register an usb class driver to the class driver manager.
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*
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* @param drv the pointer of the usb class driver.
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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_usbh_class_driver_register(ucd_t drv)
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{
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if (drv == RT_NULL) return -RT_ERROR;
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/* insert class driver into driver list */
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rt_list_insert_after(&_driver_list, &(drv->list));
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return RT_EOK;
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}
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/**
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* This function will removes a previously registed usb class driver.
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*
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* @param drv the pointer of the usb class 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_usbh_class_driver_unregister(ucd_t drv)
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{
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RT_ASSERT(drv != RT_NULL);
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/* remove class driver from driver list */
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rt_list_remove(&(drv->list));
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return RT_EOK;
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}
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/**
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* This function will run an usb class driver.
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*
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* @param drv the pointer of usb class driver.
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* @param args the parameter of run function.
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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_usbh_class_driver_enable(ucd_t drv, void* args)
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{
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RT_ASSERT(drv != RT_NULL);
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if(drv->enable != RT_NULL)
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drv->enable(args);
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return RT_EOK;
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}
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/**
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* This function will stop a usb class driver.
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*
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* @param drv the pointer of usb class driver structure.
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* @param args the argument of the stop function.
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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_usbh_class_driver_disable(ucd_t drv, void* args)
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{
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RT_ASSERT(drv != RT_NULL);
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if(drv->disable != RT_NULL)
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drv->disable(args);
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return RT_EOK;
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}
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/**
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* This function finds a usb class driver by specified class code and subclass code.
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*
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* @param class_code the usb class driver's class code.
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* @param subclass_code the usb class driver's sub class code.
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*
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* @return the registered usb class driver on successful, or RT_NULL on failure.
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*/
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ucd_t rt_usbh_class_driver_find(int class_code, int subclass_code)
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{
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struct rt_list_node *node;
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/* enter critical */
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if (rt_thread_self() != RT_NULL)
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rt_enter_critical();
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/* try to find driver object */
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for (node = _driver_list.next; node != &_driver_list; node = node->next)
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{
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ucd_t drv =
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(ucd_t)rt_list_entry(node, struct uclass_driver, list);
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if (drv->class_code == class_code)
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{
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/* leave critical */
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if (rt_thread_self() != RT_NULL)
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rt_exit_critical();
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return drv;
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}
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}
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/* leave critical */
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if (rt_thread_self() != RT_NULL)
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rt_exit_critical();
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/* not found */
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return RT_NULL;
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}
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