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|
/*
* linux/drivers/char/vdd.c
*
* Winbond uclinux virtual debug device.
* yyang1|pc32 030528
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <linux/errno.h>
#ifndef _DEBUG
#define _DEBUG
#endif
#undef _DEBUG
#ifndef EOF
#define EOF (-1)
#endif
typedef unsigned char BYTE;
typedef unsigned int BOOL;
#define TRUE 1
#define FALSE 0
#define MALLOC(x) kmalloc((x), GFP_KERNEL)
#define FREE kfree
#define MEMCPY memcpy //or use "copy_to_user"
#define DEBUGBUF_SIZE (1024 * 2)
#define VDD_CLEAR 0x5901 //clear current queue
#define MAX_VDD_DEV 2
#define VDD_MAJOR 99
typedef struct Queue
{
void * queue;
size_t MaxSize;
size_t begin;
size_t end;
size_t usage;
} Queue_t;
#ifdef CONFIG_DEVFS_FS
#include <linux/devfs_fs_kernel.h>
static devfs_handle_t devfs_vdd_handle[MAX_VDD_DEV];
static DECLARE_MUTEX(vdd_table_mutex);
#endif
static Queue_t debug_queue = {NULL, DEBUGBUF_SIZE + 1, 0, 0, 0};
static int vdd_open(struct inode *inode, struct file *filep);
static int vdd_release(struct inode *inode, struct file *filep);
static ssize_t vdd_read(struct file *filp, char * buf, size_t count, loff_t *f_pos);
static ssize_t vdd_write(struct file *filp, const char * buf, size_t count, loff_t *f_pos);
static loff_t vdd_llseek (struct file *, loff_t, int);
static int vdd_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg);
static struct file_operations vdd_ops =
{
open: vdd_open,
read: vdd_read,
write: vdd_write,
llseek: vdd_llseek,
release: vdd_release,
ioctl: vdd_ioctl,
};
//----------------------------queue funcs----------------------------------//
#define _Capacity() (debug_queue.MaxSize - 1)
#define _IsEmpty() (debug_queue.begin == debug_queue.end)
#define _IsFull() (((debug_queue.end + 1) % debug_queue.MaxSize == debug_queue.begin) ? TRUE : FALSE)
#define _Free() (_Capacity() - _Size())
#define _Begin() (debug_queue.begin)
#define _End() (debug_queue.end)
#define _nIterator(x) ((_Begin() + (x)) % debug_queue.MaxSize)
#define _First() (((BYTE *)debug_queue.queue)[(debug_queue.begin + 1) % debug_queue.MaxSize])
#define _Last() (((BYTE *)debug_queue.queue)[debug_queue.end])
#define _Usage() (debug_queue.usage)
static size_t _Size()
{
long diff_ = (long)debug_queue.end - (long)debug_queue.begin;
return (diff_ >= 0) ? diff_ : (debug_queue.MaxSize + diff_);
}
static size_t _Distance(size_t begin, size_t end)
{
long diff_ = (long)end - (long)begin;
return (diff_ >= 0) ? diff_ : (debug_queue.MaxSize + diff_);
}
static BYTE _nElement(size_t index) // index = 0 --> *(begin + 1)
{
// ASSERT((index >= 0) && (index < _Size()));
return ((BYTE *)debug_queue.queue)[_nIterator(index + 1)];
}
static void _Delete()
{
if (_IsEmpty())
return;
debug_queue.begin = (debug_queue.begin + 1) % debug_queue.MaxSize;
}
static void _Add(BYTE x)
{
if (_IsFull())
_Delete();
debug_queue.end = (debug_queue.end + 1) % debug_queue.MaxSize;
((BYTE *)debug_queue.queue)[debug_queue.end] = x;
}
//random and memcpy to optimize..
static size_t N_copy(void *buf, size_t begin, size_t end)
{
void * src_, *dst_ = buf;
size_t copy_num = 0;
// ASSERT(buf && (begin < debug_queue.MaxSize) && (end < debug_queue.MaxSize));
if(end == begin)
return 0;
if(end < begin)
{
size_t split_diff = _Capacity() - begin;
if(split_diff)
{
(BYTE *)src_ = (BYTE *)debug_queue.queue + (begin + 1) % _Capacity();
MEMCPY(dst_, src_, split_diff);
copy_num += split_diff;
(BYTE *)dst_ += copy_num;
}
src_ = debug_queue.queue;
MEMCPY(dst_, src_, end + 1);
copy_num += end + 1;
}
else // greater than
{
copy_num = end - begin;
(BYTE *)src_ = (BYTE *)debug_queue.queue + begin + 1;
MEMCPY(dst_, src_, copy_num);
}
return copy_num;
}
static void N_Delete(size_t n)
{
if (_Size() < n)
{
debug_queue.begin = debug_queue.end;
return;
}
debug_queue.begin = (debug_queue.begin + n) % debug_queue.MaxSize;
}
static void N_Add(const void *buf, size_t count)
{
size_t freed_;
size_t valid_ = (count > _Capacity()) ? _Capacity() : count;
void * src_, *dst_;
src_ = (BYTE *)buf + count - valid_;
dst_ = (BYTE *)debug_queue.queue + (debug_queue.end + 1) % debug_queue.MaxSize;
#ifdef _DEBUG
printk("***N_Add(buf = 0x%x, count = %d).\n", buf, count);
#endif
freed_ = _Free();
if (freed_ < valid_)
{
#ifdef _DEBUG
printk("Free: %d, valid %d.\n", _Free(), valid_);
#endif
N_Delete(valid_ - freed_);
}
if(debug_queue.end >= debug_queue.begin)
{
size_t split_diff = _Capacity() - debug_queue.end;
if(valid_ > split_diff)
{
MEMCPY(dst_, src_, split_diff);
debug_queue.end = _Capacity();
(BYTE *)src_ += split_diff;
valid_ -= split_diff;
dst_ = debug_queue.queue;
}
}
MEMCPY(dst_, src_, valid_);
debug_queue.end = ((BYTE *)dst_ - (BYTE *)debug_queue.queue) + valid_ - 1;
}
//----------------------------driver funcs----------------------------------//
static int vdd_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg)
{
#ifdef _DEBUG
printk("***vdd_ioctl: cmd = 0x%x, arg = 0x%x\n", cmd, arg);
#endif
switch(cmd)
{
case VDD_CLEAR:
{
debug_queue.begin = debug_queue.end = 0;
#ifdef _DEBUG
printk("***vdd_ioctl[VDD_CLEAR], now queue size = %d.\n", _Size());
#endif
break;
}
default:
return -EINVAL;
}
return 0;
}
static loff_t vdd_llseek (struct file *filp, loff_t off, int whence)
{
long newpos;
#ifdef _DEBUG
printk("*** 1 vdd_llseek off = %llu, whence = %d.\n", off, whence);
#endif
switch(whence)
{
case 0: //begin
newpos = off;
break;
case 1: //current
newpos = filp->f_pos + off;
break;
case 2: //end
newpos = _Size() + off;
break;
default:
return -EINVAL;
}
if(newpos < 0)
return -EINVAL;
filp->f_pos = newpos;
#ifdef _DEBUG
printk("*** 2 vdd_llseek newpos = %d, f_pos = %llu, whence = %d.\n", newpos, filp->f_pos, whence);
#endif
return newpos;
}
static ssize_t vdd_read(struct file *filep, char * buf, size_t count, loff_t *f_pos)
{
size_t read_num = 0;
size_t begin_, end_;
if(!debug_queue.queue || !count)
return 0;
#ifdef _DEBUG
printk("***before debug_read count = %d, buf = 0x%x, f_pos = 0x%x.\n", count, buf, filep->f_pos);
#endif
#if 0
begin_ = (count >= _Size()) ? _Begin() : (_nIterator(_Size() - count));
read_num = N_copy(buf, begin_, _End());
#else
if(filep->f_pos >= _Size())
{
//filep->f_pos = 0; //if end, then lseek to begin...
read_num = 0;
}
else
{
begin_ = _nIterator(filep->f_pos);
end_ = (count >= _Distance(begin_, _End())) ? _End() : (_nIterator(_Distance(_Begin(), begin_) + count));
_Usage()++;
read_num = N_copy(buf, begin_, end_);
_Usage()--;
#ifdef _DEBUG
printk("***debug_reading begin_ = %d, end_ = %d, read_num = %d.\n", begin_, end_, read_num);
#endif
filep->f_pos += read_num;
}
#endif
#ifdef _DEBUG
printk("***after debug_read count = %d, buf = 0x%x, f_pos = 0x%x.\n", count, buf, filep->f_pos);
#endif
return read_num;
}
static ssize_t vdd_write(struct file *filep, const char * buf, size_t count, loff_t *f_pos)
{
if(!debug_queue.queue)
return 0;
_Usage()++;
N_Add(buf, count);
_Usage()--;
#ifdef _DEBUG
printk("***debug_write count = %d, buf = 0x%x, f_pos = 0x%x.\n", count, buf, filep->f_pos);
#endif
return count;
}
static int vdd_open(struct inode *inode, struct file *filep)
{
unsigned int dev = MINOR(inode->i_rdev);
if(dev >= MAX_VDD_DEV)
return -EFAULT;
//030529?
if(_Usage())
return -EFAULT;
filep->f_op = &vdd_ops;
filep->f_pos = 0;
MOD_INC_USE_COUNT;
#ifdef _DEBUG
printk("open VDD[vdd%d] succeed!\n", dev);
#endif
return 0;
}
static int vdd_release(struct inode *inode, struct file *filep)
{
MOD_DEC_USE_COUNT;
#ifdef _DEBUG
printk("close VDD succeed!\n");
#endif
return 0;
}
#ifdef CONFIG_DEVFS_FS
static void register_vdd_usr(void)
{
int i;
down(&vdd_table_mutex);
MOD_INC_USE_COUNT;
for (i=0; i< MAX_VDD_DEV; i++)
{
char name[8];
sprintf(name, "vdd%d", i);
devfs_vdd_handle[i] = devfs_register(NULL, name,
DEVFS_FL_DEFAULT, VDD_MAJOR, i,
S_IFCHR | S_IRUGO | S_IWUGO,
&vdd_ops, NULL);
}
up(&vdd_table_mutex);
}
static void unregister_vdd_usr(void)
{
int i;
down(&vdd_table_mutex);
MOD_DEC_USE_COUNT;
for (i=0; i< MAX_VDD_DEV; i++)
devfs_unregister(devfs_vdd_handle[i]);
up(&vdd_table_mutex);
}
#endif
//----------------------------module funcs----------------------------------//
int vdd_init(void)
{
int result;
#ifdef _DEBUG
char *cptr = "Winbond Virtual Debug Device[c, 2k, round queue]!\n";
printk("****vdd initing...");
#endif
#ifdef CONFIG_DEVFS_FS
result = devfs_register_chrdev(VDD_MAJOR, "vdd", &vdd_ops);
if(result < 0)
{
printk("VDD: can't register vdd.\n");
return result;
}
register_vdd_usr();
#else
result = register_chrdev(VDD_MAJOR, "vdd", &vdd_ops);
if(result < 0)
{
printk("VDD: can't register vdd.\n");
return result;
}
#endif
if(!debug_queue.queue)
debug_queue.queue = MALLOC(debug_queue.MaxSize);
#ifdef _DEBUG
N_Add(cptr, strlen(cptr));
#endif
return 0;
}
void vdd_cleanup(void)
{
if(debug_queue.queue)
{
FREE(debug_queue.queue);
debug_queue.queue = NULL;
}
#ifdef CONFIG_DEVFS_FS
unregister_vdd_usr();
devfs_unregister_chrdev(VDD_MAJOR, "vdd");
#else
unregister_chrdev(VDD_MAJOR, "vdd");
#endif
}
module_init(vdd_init);
module_exit(vdd_cleanup);
|