/home/hillier_g/checkout/most4linux/most-kernel/most-sync.h

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/*
 *  Copyright(c) Siemens AG, Muenchen, Germany, 2005, 2006, 2007
 *                           Bernhard Walle <bernhard.walle@gmx.de>
 *                           Gernot Hillier <gernot.hillier@siemens.com>
 *
 * ----------------------------------------------------------------------------
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as 
 * published by the Free Software Foundation;
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 * ----------------------------------------------------------------------------
 */
#ifndef MOST_SYNC_H
#define MOST_SYNC_H

#ifdef __KERNEL__
#   include <linux/cdev.h>
#   include <asm/semaphore.h>
#   include <asm/ioctl.h>
#   include <linux/rwsem.h>
#   include "most-rxbuf.h"
#   include "most-txbuf.h"
#endif

#include "most-common.h"

/*
 * types and constants for userspace and kernelspace ----------------------- 
 */

#define MOST_SYNC_IOCTL_MAGIC                           'h'

#define MOST_SYNC_SETUP_RX  \
    _IOW(MOST_SYNC_IOCTL_MAGIC, 0, struct frame_part)

#define MOST_SYNC_SETUP_TX \
    _IOW(MOST_SYNC_IOCTL_MAGIC, 1, struct frame_part)

#define MOST_SYNC_MAXIOCTL                  1


#ifdef __KERNEL__

/*
 * constants --------------------------------------------------------------- 
 */

#define MOST_SYNC_MINOR_OFFSET              8


/*
 * type definitions -------------------------------------------------------- 
 */

struct most_sync_dev {
    struct cdev             cdev;                
    struct most_dev         *most_dev;           
    struct dma_buffer       hw_receive_buf;      
    struct dma_buffer       hw_transmit_buf;     
    struct rx_buffer        *sw_receive_buf;     
    struct tx_buffer        *sw_transmit_buf;    
    struct list_head        file_list;           
    atomic_t                open_count;          
    atomic_t                receiver_count;      
    atomic_t                transmitter_count;   
    wait_queue_head_t       rx_queue;            
    wait_queue_head_t       tx_queue;            
    struct rw_semaphore     config_lock_rx;      
    struct rw_semaphore     config_lock_tx;      
    unsigned char           rx_current_page;     
    unsigned char           tx_current_page;     
};

struct most_sync_file {
    struct list_head       list;                
    struct most_sync_dev   *sync_dev;           
    struct frame_part      part_rx;             
    struct frame_part      part_tx;             
    bool                   rx_running;          
    bool                   tx_running;          
    int                    reader_index;        
    int                    writer_index;        
};


ssize_t most_sync_read(struct file                  *filp, 
                       void                         *buff,
                       size_t                       count,
                       struct rtnrt_memcopy_desc    *copy);

ssize_t most_sync_write(struct file                 *filp, 
                        void                        *buff,
                        size_t                      count,
                        struct rtnrt_memcopy_desc   *copy);

int most_sync_setup_rx(struct file *filp, struct frame_part *frame_part);

int most_sync_setup_tx(struct file *filp, struct frame_part *frame_part);

#endif /* __KERNEL__ */

#endif /* MOST_SYNC_H */


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