advvcom.h

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#include "advtype.h"
 
#ifndef _ADVVCOM_H
#define _ADVVCOM_H
 
#define ADV_RING_BUF_ENABLED        1
#define ADV_RING_BUF_CLEAN      2
 
#define ADV_ATTRBUF_NUM         2
 
#ifdef __USER_SPACE_IF
 
struct ring_buf{
    int head;
    int tail;
    int begin;
    int size;
    char * mbase;
};
#else
 
#include "advconf.h"
//#define VCOM_PORTS    10
 
struct ring_buf{
    spinlock_t lock;
    int head;
    int tail;
    int begin;
    int size;
    unsigned int status;
    wait_queue_head_t wait;
    void * data;
};
 
 
 
struct adv_port_att{
    spinlock_t lock;
    struct adv_port_info _attr;
    unsigned int mctrl; /*for input pins only*/
    int _newbie;
    wait_queue_head_t wait;
    int index;
    int throttled;
    int size;
    int begin;
    int usr_ptr;
    void * data;
};
 
struct adv_vcom{
    struct uart_port * adv_uart;
    struct adv_port_att attr;
    struct ring_buf tx;
    struct ring_buf rx;
    struct proc_dir_entry * entry;
    struct list_head list;
};
 
static inline int flush_attr_info(struct adv_port_att * attr)
{
    struct adv_port_info * usr_base = attr->data;
 
    if(attr->_newbie){
        attr->_newbie = 0;
    }else{
        attr->usr_ptr = (attr->usr_ptr + 1) % ADV_ATTRBUF_NUM;
    }
 
    memcpy(&usr_base[attr->usr_ptr], &attr->_attr, sizeof(struct adv_port_info));
 
    return (attr->usr_ptr);
}
 
static inline int move_rb_head(struct ring_buf * buf, int length)
{
    if(buf->status & ADV_RING_BUF_CLEAN){
        buf->status &= (~ADV_RING_BUF_CLEAN);
        buf->head = buf->tail;
    }else{
        buf->head += length;
        buf->head %= (buf->size);
    }
 
    return 0;
}
 
static inline int move_rb_tail(struct ring_buf * buf, int length)
{
    buf->tail += length;
    buf->tail %= (buf->size);
 
    return 0;
}
 
#endif
 
static inline int is_rb_empty(struct ring_buf buf)
{
    return (buf.tail == buf.head);
}
 
static inline int get_rb_length(struct ring_buf buf)
{
    return (buf.tail >= buf.head)?(buf.tail - buf.head ):(buf.size - buf.head + buf.tail);
}
 
static inline int get_rb_llength(struct ring_buf buf)
{
    int a = buf.size - buf.head;
    int b = get_rb_length(buf);
 
    return (a < b)?a:b;
}
 
static inline int get_rb_room(struct ring_buf buf)
{
    return buf.size - get_rb_length(buf) - 1;
}
 
static inline int get_rb_lroom(struct ring_buf buf)
{
    int a = (buf.size - buf.tail);
    int b = get_rb_room(buf);
    return a < b?a:b;
}
 
static inline int get_rb_tail(struct ring_buf buf)
{
    return buf.tail;
}
 
static inline int get_rb_head(struct ring_buf buf)
{
    return buf.head;
}
 
#endif