spca5xx.c

应用于linux系统的usb接口的摄像头驱动

    {176, 144, 0x10, 0x94, 0x104A, 896},
    {160, 120, 0, 0x94, 0x204A, 384},
    {0, 0, 0, 0, 0}
};




/* default value used for spca505 and spca505b */
static __u16 spca50x_ext_modes[][6] = {
    /* x , y , Code, Value (6), Value (7), pipe */
    {640, 480, 0, 0x10, 0x10, 1023},	/* Tested spca505b+VGA sensor */
    {352, 288, 1, 0x1a, 0x1a, 1023},	/* Tested */
    {320, 240, 2, 0x1c, 0x1d, 896},	/* Tested 20:01:2004 */
    {176, 144, 4, 0x34, 0x34, 512},	/* Tested */
    {160, 120, 5, 0x40, 0x40, 384},	/* Tested */
    {0, 0, 0, 0, 0}
};
static __u16 spca506_ext_modes[][6] = {
    /* In this table, element 3 (clk) controls the
     * clock, and gets written to 0x8700.
     */
    /* x , y , Code, clk, n/a,  pipe */
    {640, 480, 0x00, 0x10, 0x10, 1023},
    {352, 288, 0x01, 0x1a, 0x1a, 1023},
    {320, 240, 0x02, 0x1c, 0x1c, 1023},	//896
    {176, 144, 0x04, 0x34, 0x34, 1023},
    {160, 120, 0x05, 0x40, 0x40, 1023},
    {0, 0, 0, 0, 0}
};

//  1a 1b 20 
static __u16 spca508_ext_modes[][6] = {
    /* In this table, element 3 (clk) controls the
     * clock, and gets written to 0x8700.
     */
    /* x , y , Code, clk, n/a,  pipe */
    {352, 288, 0x00, 0x28, 0x00, 1023},
    {320, 240, 0x01, 0x28, 0x00, 1023},
    {176, 144, 0x02, 0x23, 0x00, 1023},
    {160, 120, 0x03, 0x23, 0x00, 1023},
    {0, 0, 0, 0, 0}
};

static __u16 tv8532_ext_modes[][6] = {
    /* x , y , Code, clk, n/a,  pipe */
    {352, 288, 0x00, 0x28, 0x00, 1023},
    {320, 240, 0x10, 0x28, 0x00, 1023},
    {176, 144, 0x01, 0x23, 0x00, 1023},
    /*{160, 120, 0x03, 0x23, 0x00, 1023}, */
    {0, 0, 0, 0, 0}
};

#ifdef CONFIG_PROC_FS
/* Not sure what we should do with this. I think it is V4L level 2 stuff */
/* Currently only use RGB24 */
static struct palette_list plist[] = {
    {VIDEO_PALETTE_GREY, "GREY"},
    {VIDEO_PALETTE_HI240, "HI240"},
    {VIDEO_PALETTE_RGB565, "RGB565"},
    {VIDEO_PALETTE_RGB24, "RGB24"},
    {VIDEO_PALETTE_RGB32, "RGB32"},
    {VIDEO_PALETTE_RGB555, "RGB555"},
    {VIDEO_PALETTE_YUV422, "YUV422"},
    {VIDEO_PALETTE_YUYV, "YUYV"},
    {VIDEO_PALETTE_UYVY, "UYVY"},
    {VIDEO_PALETTE_YUV420, "YUV420"},
    {VIDEO_PALETTE_YUV411, "YUV411"},
    {VIDEO_PALETTE_RAW, "RAW"},
    {VIDEO_PALETTE_YUV422P, "YUV422P"},
    {VIDEO_PALETTE_YUV411P, "YUV411P"},
    {VIDEO_PALETTE_YUV420P, "YUV420P"},
    {VIDEO_PALETTE_YUV410P, "YUV410P"},
    {VIDEO_PALETTE_RAW_JPEG, "RJPG"},
    {VIDEO_PALETTE_JPEG, "JPEG"},
    {-1, NULL}
};
#endif				/* CONFIG_PROC_FS */

/* function for the tasklet */

void outpict_do_tasklet(unsigned long ptr);

/**********************************************************************
 *
 * Memory management
 *
 * This is a shameless copy from the USB-cpia driver (linux kernel
 * version 2.3.29 or so, I have no idea what this code actually does ;).
 * Actually it seems to be a copy of a shameless copy of the bttv-driver.
 * Or that is a copy of a shameless copy of ... (To the powers: is there
 * no generic kernel-function to do this sort of stuff?)
 *
 * Yes, it was a shameless copy from the bttv-driver. IIRC, Alan says
 * there will be one, but apparentely not yet -jerdfelt
 *
 * So I copied it again for the ov511 driver -claudio
 * And again for the spca50x driver -jcrisp
 **********************************************************************/

/* Given PGD from the address space's page table, return the kernel
 * virtual mapping of the physical memory mapped at ADR.
 */

/* Here we want the physical address of the memory.
 * This is used when initializing the contents of the
 * area and marking the pages as reserved.
 */

static inline unsigned long kvirt_to_pa(unsigned long adr)
{
    unsigned long kva, ret;

    kva = (unsigned long) page_address(vmalloc_to_page((void *) adr));
    kva |= adr & (PAGE_SIZE - 1);	/* restore the offset */
    ret = __pa(kva);
    return ret;
}


static void *rvmalloc(unsigned long size)
{
    void *mem;
    unsigned long adr;

    size = PAGE_ALIGN(size);
    mem = vmalloc_32(size);
    if (!mem)
	return NULL;

    memset(mem, 0, size);	/* Clear the ram out, no junk to the user */
    adr = (unsigned long) mem;
    while ((long) size > 0) {
	mem_map_reserve(vmalloc_to_page((void *) adr));
	adr += PAGE_SIZE;
	size -= PAGE_SIZE;
    }

    return mem;
}

static void rvfree(void *mem, unsigned long size)
{
    unsigned long adr;

    if (!mem)
	return;

    adr = (unsigned long) mem;
    while ((long) size > 0) {
	mem_map_unreserve(vmalloc_to_page((void *) adr));
	adr += PAGE_SIZE;
	size -= PAGE_SIZE;
    }
    vfree(mem);
}


/**********************************************************************
 * /proc interface
 * Based on the CPiA driver version 0.7.4 -claudio
 * ..and again copied from the ov511 driver for the SPCA50x driver - jac
 **********************************************************************/

#ifdef CONFIG_PROC_FS

static struct proc_dir_entry *spca50x_proc_entry = NULL;
#ifdef CONFIG_VIDEO_PROC_FS
extern struct proc_dir_entry *video_proc_entry;
#endif				/* CONFIG_VIDEO_PROC_FS */

#define YES_NO(x) ((x) ? "yes" : "no")

static int
spca50x_read_proc(char *page, char **start, off_t off,
		  int count, int *eof, void *data)
{
    char *out = page;
    int i, j, len;
    struct usb_spca50x *spca50x = data;

    /* IMPORTANT: This output MUST be kept under PAGE_SIZE
     *            or we need to get more sophisticated. */

    out += sprintf(out, "driver          : SPCA5XX USB Camera\n");
    out += sprintf(out, "driver_version  : %s\n", version);
    out += sprintf(out, "model           : %s\n", (spca50x->desc) ?
		   clist[spca50x->desc].description : "unknown");
    out +=
	sprintf(out, "streaming       : %s\n", YES_NO(spca50x->streaming));
    out +=
	sprintf(out, "grabbing        : %s\n", YES_NO(spca50x->grabbing));
    out +=
	sprintf(out, "compress        : %s\n", YES_NO(spca50x->compress));
    out +=
	sprintf(out, "data_format     : %s\n",
		spca50x->force_rgb ? "RGB" : "BGR");
    out +=
	sprintf(out, "brightness      : %d\n", spca50x->brightness >> 8);
    out += sprintf(out, "colour          : %d\n", spca50x->colour >> 8);
    out += sprintf(out, "hue             : %d\n", spca50x->hue >> 8);
    out += sprintf(out, "contrast        : %d\n", spca50x->contrast);
    out += sprintf(out, "num_frames      : %d\n", SPCA50X_NUMFRAMES);
    out += sprintf(out, "curframe        : %d\n", spca50x->curframe);
    out += sprintf(out, "lastFrameRead   : %d\n", spca50x->lastFrameRead);
    spca50x->avg_lum = get_avg_lum(spca50x);
    out += sprintf(out, "Avg. luminance  : 0x%X %d\n",
		   spca50x->avg_lum, spca50x->avg_lum);
    for (i = 0; i < SPCA50X_NUMFRAMES; i++) {
	out += sprintf(out, "frame           : %d\n", i);
	out +=
	    sprintf(out, "  sequence      : %d\n", spca50x->frame[i].seq);
	out +=
	    sprintf(out, "  grabstate     : %d\n",
		    spca50x->frame[i].grabstate);
	out +=
	    sprintf(out, "  depth         : %d\n",
		    spca50x->frame[i].depth);
	out +=
	    sprintf(out, "  size          : %d %d\n",
		    spca50x->frame[i].width, spca50x->frame[i].height);
	out += sprintf(out, "  format        : ");
	for (j = 0; plist[j].num >= 0; j++) {
	    if (plist[j].num == spca50x->frame[i].format) {
		out += sprintf(out, "%s\n", plist[j].name);
		break;
	    }
	}
	if (plist[j].num < 0)
	    out += sprintf(out, "unknown\n");
	out += sprintf(out, "  data_buffer   : 0x%p\n",
		       spca50x->frame[i].data);
    }
    out += sprintf(out, "packet_size     : %d\n", spca50x->packet_size);
    out += sprintf(out, "framebuffer     : 0x%p\n", spca50x->fbuf);
#ifdef SPCA50X_ENABLE_EXPERIMENTAL
    out += sprintf(out, "stable          : %d\n", spca50x->nstable);
    out += sprintf(out, "unstable        : %d\n", spca50x->nunstable);
    out +=
	sprintf(out, "whiteness       : %d\n", spca50x->whiteness >> 12);
    spca50x->avg_rg = get_avg_RG(spca50x);
    spca50x->avg_bg = get_avg_BG(spca50x);
    out += sprintf(out, "Avg. R-G/B-G  : 0x%X/0x%X %d/%d\n",
		   spca50x->avg_rg, spca50x->avg_bg,
		   (char) spca50x->avg_rg, (char) spca50x->avg_bg);
#endif				/* SPCA50X_ENABLE_EXPERIMENTAL */

    len = out - page;
    len -= off;
    if (len < count) {
	*eof = 1;
	if (len <= 0)
	    return 0;
    } else
	len = count;

    *start = page + off;

    return len;
}

static int
spca50x_write_proc(struct file *file, const char *buffer,
		   unsigned long count, void *data)
{
    return -EINVAL;
}

/*
 * Function services read requests to control proc entry
 * and prints all the static variables
 */
static int
spca50x_ctlread_proc(char *page, char **start, off_t off,
		     int count, int *eof, void *data)
{
    char *out = page;
    int len = 0;
    struct usb_spca50x *spca50x = data;

    out += sprintf(out, "force_rgb = %d\n", spca50x->force_rgb);
    out += sprintf(out, "min_bpp = %d\n", spca50x->min_bpp);
    out += sprintf(out, "lum_level = %d\n", spca50x->lum_level);
    out += sprintf(out, "debug = %d\n", debug);

    len = out - page;
    len -= off;
    if (len < count) {
	*eof = 1;
	if (len <= 0)
	    return 0;
    } else
	len = count;

    *start = page + off;

    return len;
}

/*
 * Function compares two strings.
 * Return offset in pussy where prick ends if "prick" may penetrate 
 * int "pussy" like prick into pussy, -1 otherwise.
 */
static inline int match(const char *prick, const char *pussy, int len2)
{
    int len1 = strlen(prick);	//length of male string
    int i;			//just an index variable
    const char *tmp;		//temporary pointer for my own pleasure

    // We skip all spaces and tabs
    for (i = 0; i < len2 && (pussy[i] == ' ' || pussy[i] == '\t'); i++) {
    }

    tmp = pussy + i;		// pointer to pussy with skipped shit (spaces and tabs)
    len2 = strlen(tmp);		//calculate length again

    if (len1 > len2)
	return -1;		//Fuck off, no fucking

    if (!strncmp(prick, tmp, len1))
	return i + len1;

    return -1;
}

/*
 * Try to calculate value from string (atoi). Converts  
 * decimal integer
 */
static inline int atoi(const char *str)
{
    int result = 0;		//result of the function
    int i;			//just an index variable

    for (i = 0; str[i] >= '0' && str[i] <= '9'; i++) {
	result *= 10;
	result += str[i] - '0';
    }
    return result;
}


static int
spca50x_ctlwrite_proc(struct file *file, const char *buffer,
		      unsigned long count, void *data)
{
    int off;			//where look for a value
    struct usb_spca50x *spca50x = data;

    if ((off = match("lum_level=", buffer, count)) >= 0)
	spca50x->lum_level = atoi(buffer + off);
    if ((off = match("min_bpp=", buffer, count)) >= 0)
	spca50x->min_bpp = atoi(buffer + off);
    if ((off = match("force_rgb=", buffer, count)) >= 0)
	spca50x->force_rgb = atoi(buffer + off);
    if ((off = match("debug=", buffer, count)) >= 0)
	debug = atoi(buffer + off);

    return count;
}

static void create_proc_spca50x_cam(struct usb_spca50x *spca50x)
{
    char name[PROC_NAME_LEN];
    struct proc_dir_entry *ent;

    if (!spca50x_proc_entry || !spca50x)
	return;

//Create videoxx proc entry
    sprintf(name, "video%d", spca50x->vdev->minor);
    PDEBUG(4, "creating /proc/video/spca50x/%s", name);

    ent =
	create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
			  spca50x_proc_entry);

    if (!ent)
	return;

    ent->data = spca50x;
    ent->read_proc = spca50x_read_proc;
    ent->write_proc = spca50x_write_proc;
    spca50x->proc_entry = ent;

// Create the controlxx proc entry
    sprintf(name, "control%d", spca50x->vdev->minor);
    PDEBUG(4, "creating /proc/video/spca50x/%s", name);
    ent = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
			    spca50x_proc_entry);

    if (!ent)
	return;

    ent->data = spca50x;
    ent->read_proc = spca50x_ctlread_proc;
    ent->write_proc = spca50x_ctlwrite_proc;
    spca50x->ctl_proc_entry = ent;

}

static void destroy_proc_spca50x_cam(struct usb_spca50x *spca50x)
{
    char name[PROC_NAME_LEN];

    if (!spca50x || !spca50x_proc_entry)
	return;

    /* destroy videoxx proc entry */
    if (spca50x->proc_entry != NULL) {
	sprintf(name, "video%d", spca50x->vdev->minor);