ncplus_mjpeg.c

MJPEG Driver 3.0.1

/*
 * ncplus_mjpeg.c
 *
 * Copyright(C) 2005 Chipsbrain Co., Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; with out 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, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 *
 * modified by Chipsbrain Engineer <[e-mail]>
 */

static const char version[] = "ncplus_mjpeg.c:v3.0.1 (C) 2005 Chipsbrain Co., Ltd.\n";

#ifndef __KERNEL__
#  define __KERNEL__
#endif
#ifndef MODULE
#  define MODULE
#endif

#define MJPEG_PROC

#define __NO_VERSION__
#include <linux/module.h>
#include <linux/version.h>
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>	/* printk() */
#include <linux/slab.h>		/* kmalloc() */
#include <linux/vmalloc.h>	/* vmalloc() */
#include <linux/fs.h>		/* everything... */
#include <linux/errno.h>	/* error codes */
#include <linux/types.h>	/* size_t */
#include <linux/fcntl.h>	/* O_ACCMODE */
#include <linux/kdev_t.h>
#include <linux/timer.h>	

#include <asm/system.h>		/* cli(), *_flags */
#include <linux/interrupt.h>
#include <linux/sched.h>

#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>
//#include <asm-arm/spinlock.h>	
#ifdef MJPEG_PROC
#include <linux/proc_fs.h>
#endif

#include "ncplus_mjpeg.h"		/* local definitions and sysdep.h */
#include "ncplus_jpghdr.h"		/* jpeg header */

/*
#define MJPEG_RESOL_160		0x00
#define MJPEG_RESOL_320		0x01
#define MJPEG_RESOL_640		0x02

#define MJPEG_YUV_420		0x03
#define MJPEG_YUV_422		0x04
*/

struct mjpeg_buffer {
	char	valid;			/* is valid */
	int	count;			/* buffer count */
	char	*data;			/* buffer data */
};

#if 0
struct mjpeg_info {
	char	res;			/* resolution */
	char	yuv;			/* YUV format */
	int	alpha;			/* alpha coefficient */
};
#endif

struct mjpeg_device {
	spinlock_t	lock;		/* buffer lock */
	struct mjpeg_buffer buf[2];	/* buffer */
	struct mjpeg_buffer *wbuf;	/* write buffer pointer */
	struct mjpeg_buffer *rbuf;	/* read buffer pointer */
	int max_size;			/* status: mjpeg data max size */
	unsigned char jpg_hdr[JPEG_HDR_SIZE];
//	struct mjpeg_info *info;	/* mjpeg infomation */
	int jpg_rotate;
};

static struct mjpeg_device *mjpeg_dev = NULL;

// mjpeg watchdog 
#define MJPEG_WATCHDOG_TIMEOUT		1 // 1 sec

static unsigned long mjpeg_watchdog_timeout;
struct timer_list mjpeg_watchdog_timer;

#define DEVICE_NAME	"mjpeg"
#define BUF1	0
#define BUF2	1

/*
 * I don't use static symbols here, because we export no symbols
 */
static int mjpeg_major = MJPEG_MAJOR;

static int gs_new_frame = 0;

static int mjpeg_default = 2; // 0(q0), 1(q2), 2(c0), 3(c2), 4(v0), 5(v2)
static int mjpeg_debug_ioctl = 0;
static int mjpeg_perform = 9256; // 9256(c0, c2), 9216(q0, q2)

static int mjpeg_alphacoeff = 64;	/* 50%(64), 32(best), 128(worst) */

static int mjpeg_bDeviceReadOpen = 0;
static int mjpeg_bDeviceWriteOpen = 0;

static int gs_thread_no=0;

MODULE_PARM(mjpeg_default,"i");
MODULE_PARM(mjpeg_alphacoeff,"i");
MODULE_PARM(mjpeg_debug,"i");
MODULE_PARM(mjpeg_debug_owner,"i");
MODULE_PARM(mjpeg_debug_interrupt,"i");
MODULE_PARM(mjpeg_debug_ioctl,"i");
MODULE_PARM(mjpeg_debug_stop,"i");
MODULE_PARM(mjpeg_perform,"i");
MODULE_PARM(mjpeg_frmeasure,"i");

//MODULE_AUTHOR("donald kim");
//MODULE_LICENSE("GPL");

/*
 * Functions Prototypes
 */
int mjpeg_init_module(void);
void mjpeg_cleanup_module(void);

int mjpeg_open(struct inode *inode, struct file *filp);
ssize_t mjpeg_read(struct file *filp, char *buffer, size_t length, loff_t *offset);
int mjpeg_release(struct inode *inode, struct file *filp);
int mjpeg_ioctl(struct inode *inodep, struct file *filp, unsigned int cmd, unsigned long arg);
static int mjpeg_raw_reset(void);
static int mjpeg_reset(struct mjpeg_device *dev);
static void setup_mjpeg(struct mjpeg_device *dev);
void ncplus_mjpeg_interrupt(int, void *, struct pt_regs *);
static void setting_by_ioctl(struct mjpeg_device *dev);
static void mjpeg_watchdog_init(void);
static void mjpeg_watchdog(unsigned long data);

static int mjpeg_buff_alloc(struct mjpeg_device *dev);
static void mjpeg_buff_free(struct mjpeg_device *dev);
static inline void mjpeg_buff_change(struct mjpeg_device *dev);
static inline void mjpeg_buff_init(struct mjpeg_device *dev);

static int mjpeg_hdr_res(struct mjpeg_device *dev);
static int mjpeg_hdr_qt(struct mjpeg_device *dev);

#ifdef MJPEG_PROC
struct proc_dir_entry *proc_mjpeg;
#endif


/*
 * Device Operations
 */

struct file_operations mjpeg_fops = {
    read : mjpeg_read,
    ioctl : mjpeg_ioctl,        
    open : mjpeg_open,
    release : mjpeg_release,
};

/*
 * JPEG Header
 *      Resolution
 *      YUV
 */
static int mjpeg_hdr_res(struct mjpeg_device *dev)
{
	switch (mjpeg_default) {
		case 0: /* 160x120 YUV 420 */
			dev->jpg_hdr[0x245] = 0x00; /* width */
			dev->jpg_hdr[0x246] = 0xA0; 
			dev->jpg_hdr[0x243] = 0x00; /* height */
			dev->jpg_hdr[0x244] = 0x78;
			dev->jpg_hdr[0x249] = 0x22; /* YUV 420 */
			dev->jpg_hdr[0x23C] = 0x07; /* q0 */
			dev->jpg_hdr[0x23D] = 0xD0; 
			break;
		case 1: /* 160x120 YUV 422 */
			dev->jpg_hdr[0x245] = 0x00; /* width */
			dev->jpg_hdr[0x246] = 0xA0; 
			dev->jpg_hdr[0x243] = 0x00; /* height */
			dev->jpg_hdr[0x244] = 0x78;
			dev->jpg_hdr[0x249] = 0x21; /* YUV 422 */
			dev->jpg_hdr[0x23C] = 0x03; /* q2 */
			dev->jpg_hdr[0x23D] = 0xE8;
			break;
		case 2: /* 320x240 YUV 420 */
			dev->jpg_hdr[0x245] = 0x01; /* width */
			dev->jpg_hdr[0x246] = 0x40; 
			dev->jpg_hdr[0x243] = 0x00; /* height */
			dev->jpg_hdr[0x244] = 0xF0;
			dev->jpg_hdr[0x249] = 0x22; /* YUV 420 */
			dev->jpg_hdr[0x23C] = 0x03; /* c0 */
			dev->jpg_hdr[0x23D] = 0xE8;
			break;
		case 3: /* 320x240 YUV 422 */
			dev->jpg_hdr[0x245] = 0x01; /* width */
			dev->jpg_hdr[0x246] = 0x40; 
			dev->jpg_hdr[0x243] = 0x00; /* height */
			dev->jpg_hdr[0x244] = 0xF0;
			dev->jpg_hdr[0x249] = 0x21; /* YUV 422 */
			dev->jpg_hdr[0x23C] = 0x07; /* c2 */
			dev->jpg_hdr[0x23D] = 0xD0;
			break;
		case 4: /* 640x480 YUV 420 */
			dev->jpg_hdr[0x245] = 0x02; /* width */
			dev->jpg_hdr[0x246] = 0x80; 
			dev->jpg_hdr[0x243] = 0x01; /* height */
			dev->jpg_hdr[0x244] = 0xE0;
			dev->jpg_hdr[0x249] = 0x22; /* YUV 420 */
			dev->jpg_hdr[0x23C] = 0x07; /* v0 */
			dev->jpg_hdr[0x23D] = 0xD0;
			break;
		case 5: /* 640x480 YUV 422 */
			dev->jpg_hdr[0x245] = 0x02; /* width */
			dev->jpg_hdr[0x246] = 0x80; 
			dev->jpg_hdr[0x243] = 0x01; /* height */
			dev->jpg_hdr[0x244] = 0xE0;
			dev->jpg_hdr[0x249] = 0x21; /* YUV 422 */
			dev->jpg_hdr[0x23C] = 0x07; /* v2 */
			dev->jpg_hdr[0x23D] = 0xD0;
			break;
		default:
			printk("mjpeg: header error\n");
			return -1;
	}

	return 0;
}
	
/*
 * JPEG Header
 *      Quantization table
 */
static int mjpeg_hdr_qt(struct mjpeg_device *dev)
{
	int r;
	int i;
	unsigned long tmp;

	switch (mjpeg_alphacoeff) {
		case 32:
			for (i = 0; i < 64; i++) {
				dev->jpg_hdr[0x07+i] = yquant[i] / 2;
				dev->jpg_hdr[0x48+i] = uvquant[i] / 2;
			}
			goto final;
		case 64:
			r = 1;
			break;
		case 128:
			r = 2;
			break;
		case 256:
			r = 4;
			break;
		case 512:
			r = 8;
			break;
		default:
			printk("mjpg: header error\n");
			return -1;
	}

	for (i = 0; i < 64; i++) {
		tmp = (unsigned long)yquant[i];
		tmp = tmp * r;
		if (tmp > 0xff)
			tmp = 0xff;
		dev->jpg_hdr[0x07+i] = (unsigned char)tmp;
		tmp = (unsigned long)uvquant[i];
		tmp = tmp * r;
		if (tmp > 0xff) 
			tmp = 0xff;
		dev->jpg_hdr[0x48+i] = (unsigned char)tmp;
	}

final:
	return 0;
}

#ifdef MJPEG_PROC
int mjpeg_read_proc(char *page, char **start, off_t off, int count,
		int *eof, void *data)
{
	struct mjpeg_device *dev = mjpeg_dev;
	struct mjpeg_buffer *r = dev->rbuf;
	int size = 0;

	size += sprintf(page+size, "%20s : %7d bytes\n", 
			"mjpeg data",
			r->count);
	size += sprintf(page+size, "%20s : %7d bytes\n",
			"mjpeg max data",
			dev->max_size);

	return size;
}
#endif

static inline void mjpeg_buff_init(struct mjpeg_device *dev) 
{
	struct mjpeg_buffer *buf = dev->wbuf;
	buf->valid = 0;
	buf->count = 0;
	/*
	 * jpeg header copy
	 */
	memcpy(buf->data, dev->jpg_hdr, JPEG_HDR_SIZE);
	buf->count += JPEG_HDR_SIZE;
}

static inline void mjpeg_buff_change(struct mjpeg_device *dev)
{
	struct mjpeg_buffer *tmp;

	tmp = dev->rbuf;

	dev->rbuf = dev->wbuf;
	dev->wbuf = tmp;
}

/*
 * mjpeg interrupt service routine
 */
void ncplus_mjpeg_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	unsigned long dma_count, status;
	struct mjpeg_device *dev = dev_id;
	struct mjpeg_buffer *w = dev->wbuf;
	unsigned long *buffer = NULL;

	
	// mjpeg watchdog timeout renewal
	mjpeg_watchdog_timeout = jiffies + (HZ * MJPEG_WATCHDOG_TIMEOUT);
	mod_timer(&mjpeg_watchdog_timer, mjpeg_watchdog_timeout);

	if(gs_new_frame) {
		mjpeg_buff_init(dev);
		gs_new_frame = 0;

		gs_thread_no = 0;
	}

	buffer = (unsigned long *)(w->data + w->count);

	status = mjpeg_readl(MODULE_FUNC_STS);
	dma_count = (((unsigned long)mjpeg_readl(MCU_FIFO_STATUS)&0xffff0000)>>16);
	if (w->count + (dma_count * 4) > COMPRESSED_SIZE) {
		printk("mjpeg: buffer overflow\n");
		mjpeg_reset(dev);
		mjpeg_buff_init(dev);
		return;
	}

	if ((status & FRAME_ENC_FINISHED)==0x60) {
		mjpeg_writel((mjpeg_readl(JPEG_STATUS))&0xfffffffe, JPEG_STATUS);
	}

	insl(MJPEG_BASE+DMA_START_ADD_VAL, buffer, dma_count);
	w->count += dma_count * 4;

	if ((status & FRAME_ENC_FINISHED)==0x60) {
		if (w->count > dev->max_size)
			dev->max_size = w->count;
		w->valid = 1;
		mjpeg_buff_change(dev);
		gs_new_frame = 1;
	}

	return;
}


/*
 * Device Operations
 */

int mjpeg_open(struct inode *inode, struct file *filp)
{

    
    if ((filp->f_flags & O_ACCMODE) & (O_WRONLY | O_RDWR)) {
	/*
        if (mjpeg_bDeviceWriteOpen) {
            printk(DEVICE_NAME " : Device already open for writing\n");
            return -EBUSY;
        } else
	*/
            ++mjpeg_bDeviceWriteOpen;
    } else {
	/*
        if (mjpeg_bDeviceReadOpen) {
            printk(DEVICE_NAME " : Device already open for reading\n");
            return -EBUSY;
        } else
	*/
            ++mjpeg_bDeviceReadOpen;
    }

    /*
    if (!filp->private_data) {
	    //dev = mjpeg_dev;
	    filp->private_data = dev;
    } else {
	    dev = filp->private_data;
    }
    */

    //filp->private_data = dev;

    //MOD_INC_USE_COUNT;

    return 0;
}

int mjpeg_release(struct inode *inode, struct file *filp)
{

    if ((filp->f_flags & O_ACCMODE) & (O_WRONLY | O_RDWR))
        --mjpeg_bDeviceWriteOpen;
    else
        --mjpeg_bDeviceReadOpen;

    //MOD_DEC_USE_COUNT;

    return 0;
}

/*
 * return value
 * 0 : end of file
 * positive : read bytes count
 * negative(-1) : buffer empty
 */
ssize_t mjpeg_read(struct file *filp, char *buffer, size_t length, loff_t *offset)
{
    	struct mjpeg_device *dev = mjpeg_dev;
	struct mjpeg_buffer *r = dev->rbuf;
	int count = 0;
	unsigned long flags;	// spin_lock flags


	spin_lock_irqsave(dev->lock, flags);

	if (r->valid) {
		count = r->count;
		if (copy_to_user(buffer, r->data, count) ) {
			printk(DEVICE_NAME " : copy_to_user fault!\n");
			return -EFAULT;
		}
	} else
		count = 0;

	spin_unlock_irqrestore(mjpeg_device, flags);

	return count;
}


/*
 * The ioctl() implementation
 */
int mjpeg_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
{
    	struct mjpeg_device *dev = mjpeg_dev;

	int err = 0;