usbvideo.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:64k
- /*
- * 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, or (at your option)
- * any later version.
- *
- * 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.
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/list.h>
- #include <linux/slab.h>
- #define __NO_VERSION__ /* Temporary: usbvideo is not a module yet */
- #include <linux/module.h>
- #include <linux/mm.h>
- #include <linux/smp_lock.h>
- #include <linux/vmalloc.h>
- #include <linux/wrapper.h>
- #include <linux/init.h>
- #include <linux/spinlock.h>
- #include <asm/io.h>
- #include "usbvideo.h"
- #if defined(MAP_NR)
- #define virt_to_page(v) MAP_NR(v) /* Kernels 2.2.x */
- #endif
- static int video_nr = -1;
- MODULE_PARM(video_nr, "i");
- /*
- * Local prototypes.
- */
- #if USES_PROC_FS
- static void usbvideo_procfs_level1_create(usbvideo_t *ut);
- static void usbvideo_procfs_level1_destroy(usbvideo_t *ut);
- static void usbvideo_procfs_level2_create(uvd_t *uvd);
- static void usbvideo_procfs_level2_destroy(uvd_t *uvd);
- static int usbvideo_default_procfs_read_proc(
- char *page, char **start, off_t off, int count,
- int *eof, void *data);
- static int usbvideo_default_procfs_write_proc(
- struct file *file, const char *buffer,
- unsigned long count, void *data);
- #endif
- /*******************************/
- /* Memory management functions */
- /*******************************/
- /*
- * Here we want the physical address of the memory.
- * This is used when initializing the contents of the area.
- */
- unsigned long usbvideo_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;
- }
- void *usbvideo_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 (size > 0) {
- mem_map_reserve(vmalloc_to_page((void *)adr));
- adr += PAGE_SIZE;
- size -= PAGE_SIZE;
- }
- return mem;
- }
- void usbvideo_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);
- }
- void RingQueue_Initialize(RingQueue_t *rq)
- {
- assert(rq != NULL);
- init_waitqueue_head(&rq->wqh);
- }
- void RingQueue_Allocate(RingQueue_t *rq, int rqLen)
- {
- assert(rq != NULL);
- assert(rqLen > 0);
- rq->length = rqLen;
- rq->queue = usbvideo_rvmalloc(rq->length);
- assert(rq->queue != NULL);
- }
- int RingQueue_IsAllocated(const RingQueue_t *rq)
- {
- if (rq == NULL)
- return 0;
- return (rq->queue != NULL) && (rq->length > 0);
- }
- void RingQueue_Free(RingQueue_t *rq)
- {
- assert(rq != NULL);
- if (RingQueue_IsAllocated(rq)) {
- usbvideo_rvfree(rq->queue, rq->length);
- rq->queue = NULL;
- rq->length = 0;
- }
- }
- int RingQueue_Dequeue(RingQueue_t *rq, unsigned char *dst, int len)
- {
- int i;
- assert(rq != NULL);
- assert(dst != NULL);
- for (i=0; i < len; i++) {
- dst[i] = rq->queue[rq->ri];
- RING_QUEUE_DEQUEUE_BYTES(rq,1);
- }
- return len;
- }
- int RingQueue_Enqueue(RingQueue_t *rq, const unsigned char *cdata, int n)
- {
- int enqueued = 0;
- assert(rq != NULL);
- assert(cdata != NULL);
- assert(rq->length > 0);
- while (n > 0) {
- int m, q_avail;
- /* Calculate the largest chunk that fits the tail of the ring */
- q_avail = rq->length - rq->wi;
- if (q_avail <= 0) {
- rq->wi = 0;
- q_avail = rq->length;
- }
- m = n;
- assert(q_avail > 0);
- if (m > q_avail)
- m = q_avail;
- memmove(rq->queue + rq->wi, cdata, m);
- RING_QUEUE_ADVANCE_INDEX(rq, wi, m);
- cdata += m;
- enqueued += m;
- n -= m;
- }
- return enqueued;
- }
- int RingQueue_GetLength(const RingQueue_t *rq)
- {
- int ri, wi;
- assert(rq != NULL);
- ri = rq->ri;
- wi = rq->wi;
- if (ri == wi)
- return 0;
- else if (ri < wi)
- return wi - ri;
- else
- return wi + (rq->length - ri);
- }
- void RingQueue_InterruptibleSleepOn(RingQueue_t *rq)
- {
- assert(rq != NULL);
- interruptible_sleep_on(&rq->wqh);
- }
- void RingQueue_WakeUpInterruptible(RingQueue_t *rq)
- {
- assert(rq != NULL);
- if (waitqueue_active(&rq->wqh))
- wake_up_interruptible(&rq->wqh);
- }
- /*
- * usbvideo_VideosizeToString()
- *
- * This procedure converts given videosize value to readable string.
- *
- * History:
- * 07-Aug-2000 Created.
- * 19-Oct-2000 Reworked for usbvideo module.
- */
- void usbvideo_VideosizeToString(char *buf, int bufLen, videosize_t vs)
- {
- char tmp[40];
- int n;
- n = 1 + sprintf(tmp, "%ldx%ld", VIDEOSIZE_X(vs), VIDEOSIZE_Y(vs));
- assert(n < sizeof(tmp));
- if ((buf == NULL) || (bufLen < n))
- err("usbvideo_VideosizeToString: buffer is too small.");
- else
- memmove(buf, tmp, n);
- }
- /*
- * usbvideo_OverlayChar()
- *
- * History:
- * 01-Feb-2000 Created.
- */
- void usbvideo_OverlayChar(uvd_t *uvd, usbvideo_frame_t *frame,
- int x, int y, int ch)
- {
- static const unsigned short digits[16] = {
- 0xF6DE, /* 0 */
- 0x2492, /* 1 */
- 0xE7CE, /* 2 */
- 0xE79E, /* 3 */
- 0xB792, /* 4 */
- 0xF39E, /* 5 */
- 0xF3DE, /* 6 */
- 0xF492, /* 7 */
- 0xF7DE, /* 8 */
- 0xF79E, /* 9 */
- 0x77DA, /* a */
- 0xD75C, /* b */
- 0xF24E, /* c */
- 0xD6DC, /* d */
- 0xF34E, /* e */
- 0xF348 /* f */
- };
- unsigned short digit;
- int ix, iy;
- if ((uvd == NULL) || (frame == NULL))
- return;
- if (ch >= '0' && ch <= '9')
- ch -= '0';
- else if (ch >= 'A' && ch <= 'F')
- ch = 10 + (ch - 'A');
- else if (ch >= 'a' && ch <= 'f')
- ch = 10 + (ch - 'a');
- else
- return;
- digit = digits[ch];
- for (iy=0; iy < 5; iy++) {
- for (ix=0; ix < 3; ix++) {
- if (digit & 0x8000) {
- if (uvd->paletteBits & (1L << VIDEO_PALETTE_RGB24)) {
- /* TODO */ RGB24_PUTPIXEL(frame, x+ix, y+iy, 0xFF, 0xFF, 0xFF);
- }
- }
- digit = digit << 1;
- }
- }
- }
- /*
- * usbvideo_OverlayString()
- *
- * History:
- * 01-Feb-2000 Created.
- */
- void usbvideo_OverlayString(uvd_t *uvd, usbvideo_frame_t *frame,
- int x, int y, const char *str)
- {
- while (*str) {
- usbvideo_OverlayChar(uvd, frame, x, y, *str);
- str++;
- x += 4; /* 3 pixels character + 1 space */
- }
- }
- /*
- * usbvideo_OverlayStats()
- *
- * Overlays important debugging information.
- *
- * History:
- * 01-Feb-2000 Created.
- */
- void usbvideo_OverlayStats(uvd_t *uvd, usbvideo_frame_t *frame)
- {
- const int y_diff = 8;
- char tmp[16];
- int x = 10, y=10;
- long i, j, barLength;
- const int qi_x1 = 60, qi_y1 = 10;
- const int qi_x2 = VIDEOSIZE_X(frame->request) - 10, qi_h = 10;
- /* Call the user callback, see if we may proceed after that */
- if (VALID_CALLBACK(uvd, overlayHook)) {
- if (GET_CALLBACK(uvd, overlayHook)(uvd, frame) < 0)
- return;
- }
- /*
- * We draw a (mostly) hollow rectangle with qi_xxx coordinates.
- * Left edge symbolizes the queue index 0; right edge symbolizes
- * the full capacity of the queue.
- */
- barLength = qi_x2 - qi_x1 - 2;
- if ((barLength > 10) && (uvd->paletteBits & (1L << VIDEO_PALETTE_RGB24))) {
- /* TODO */ long u_lo, u_hi, q_used;
- long m_ri, m_wi, m_lo, m_hi;
- /*
- * Determine fill zones (used areas of the queue):
- * 0 xxxxxxx u_lo ...... uvd->dp.ri xxxxxxxx u_hi ..... uvd->dp.length
- *
- * if u_lo < 0 then there is no first filler.
- */
- q_used = RingQueue_GetLength(&uvd->dp);
- if ((uvd->dp.ri + q_used) >= uvd->dp.length) {
- u_hi = uvd->dp.length;
- u_lo = (q_used + uvd->dp.ri) % uvd->dp.length;
- } else {
- u_hi = (q_used + uvd->dp.ri);
- u_lo = -1;
- }
- /* Convert byte indices into screen units */
- m_ri = qi_x1 + ((barLength * uvd->dp.ri) / uvd->dp.length);
- m_wi = qi_x1 + ((barLength * uvd->dp.wi) / uvd->dp.length);
- m_lo = (u_lo > 0) ? (qi_x1 + ((barLength * u_lo) / uvd->dp.length)) : -1;
- m_hi = qi_x1 + ((barLength * u_hi) / uvd->dp.length);
- for (j=qi_y1; j < (qi_y1 + qi_h); j++) {
- for (i=qi_x1; i < qi_x2; i++) {
- /* Draw border lines */
- if ((j == qi_y1) || (j == (qi_y1 + qi_h - 1)) ||
- (i == qi_x1) || (i == (qi_x2 - 1))) {
- RGB24_PUTPIXEL(frame, i, j, 0xFF, 0xFF, 0xFF);
- continue;
- }
- /* For all other points the Y coordinate does not matter */
- if ((i >= m_ri) && (i <= (m_ri + 3))) {
- RGB24_PUTPIXEL(frame, i, j, 0x00, 0xFF, 0x00);
- } else if ((i >= m_wi) && (i <= (m_wi + 3))) {
- RGB24_PUTPIXEL(frame, i, j, 0xFF, 0x00, 0x00);
- } else if ((i < m_lo) || ((i > m_ri) && (i < m_hi)))
- RGB24_PUTPIXEL(frame, i, j, 0x00, 0x00, 0xFF);
- }
- }
- }
- sprintf(tmp, "%8lx", uvd->stats.frame_num);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8lx", uvd->stats.urb_count);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8lx", uvd->stats.urb_length);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8lx", uvd->stats.data_count);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8lx", uvd->stats.header_count);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8lx", uvd->stats.iso_skip_count);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8lx", uvd->stats.iso_err_count);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8x", uvd->vpic.colour);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8x", uvd->vpic.hue);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8x", uvd->vpic.brightness >> 8);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8x", uvd->vpic.contrast >> 12);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- sprintf(tmp, "%8d", uvd->vpic.whiteness >> 8);
- usbvideo_OverlayString(uvd, frame, x, y, tmp);
- y += y_diff;
- }
- /*
- * usbvideo_ReportStatistics()
- *
- * This procedure prints packet and transfer statistics.
- *
- * History:
- * 14-Jan-2000 Corrected default multiplier.
- */
- void usbvideo_ReportStatistics(const uvd_t *uvd)
- {
- if ((uvd != NULL) && (uvd->stats.urb_count > 0)) {
- unsigned long allPackets, badPackets, goodPackets, percent;
- allPackets = uvd->stats.urb_count * CAMERA_URB_FRAMES;
- badPackets = uvd->stats.iso_skip_count + uvd->stats.iso_err_count;
- goodPackets = allPackets - badPackets;
- /* Calculate percentage wisely, remember integer limits */
- assert(allPackets != 0);
- if (goodPackets < (((unsigned long)-1)/100))
- percent = (100 * goodPackets) / allPackets;
- else
- percent = goodPackets / (allPackets / 100);
- info("Packet Statistics: Total=%lu. Empty=%lu. Usage=%lu%%",
- allPackets, badPackets, percent);
- if (uvd->iso_packet_len > 0) {
- unsigned long allBytes, xferBytes;
- char multiplier = ' ';
- allBytes = allPackets * uvd->iso_packet_len;
- xferBytes = uvd->stats.data_count;
- assert(allBytes != 0);
- if (xferBytes < (((unsigned long)-1)/100))
- percent = (100 * xferBytes) / allBytes;
- else
- percent = xferBytes / (allBytes / 100);
- /* Scale xferBytes for easy reading */
- if (xferBytes > 10*1024) {
- xferBytes /= 1024;
- multiplier = 'K';
- if (xferBytes > 10*1024) {
- xferBytes /= 1024;
- multiplier = 'M';
- if (xferBytes > 10*1024) {
- xferBytes /= 1024;
- multiplier = 'G';
- if (xferBytes > 10*1024) {
- xferBytes /= 1024;
- multiplier = 'T';
- }
- }
- }
- }
- info("Transfer Statistics: Transferred=%lu%cB Usage=%lu%%",
- xferBytes, multiplier, percent);
- }
- }
- }
- /*
- * usbvideo_DrawLine()
- *
- * A standard implementation of Bresenham's line drawing algorithm.
- * This procedure is provided primarily for debugging or demo
- * purposes.
- */
- void usbvideo_DrawLine(
- usbvideo_frame_t *frame,
- int x1, int y1,
- int x2, int y2,
- unsigned char cr, unsigned char cg, unsigned char cb)
- {
- int i, dx, dy, np, d;
- int dinc1, dinc2, x, xinc1, xinc2, y, yinc1, yinc2;
- if ((dx = x2 - x1) < 0)
- dx = -dx;
- if ((dy = y2 - y1) < 0)
- dy = -dy;
- if (dx >= dy) {
- np = dx + 1;
- d = (2 * dy) - dx;
- dinc1 = dy << 1;
- dinc2 = (dy - dx) << 1;
- xinc1 = 1;
- xinc2 = 1;
- yinc1 = 0;
- yinc2 = 1;
- } else {
- np = dy + 1;
- d = (2 * dx) - dy;
- dinc1 = dx << 1;
- dinc2 = (dx - dy) << 1;
- xinc1 = 0;
- xinc2 = 1;
- yinc1 = 1;
- yinc2 = 1;
- }
- /* Make sure x and y move in the right directions */
- if (x1 > x2) {
- xinc1 = -xinc1;
- xinc2 = -xinc2;
- }
- if (y1 > y2) {
- yinc1 = -yinc1;
- yinc2 = -yinc2;
- }
- for (i=0, x=x1, y=y1; i < np; i++) {
- if (frame->palette == VIDEO_PALETTE_RGB24) {
- /* TODO */ RGB24_PUTPIXEL(frame, x, y, cr, cg, cb);
- }
- if (d < 0) {
- d += dinc1;
- x += xinc1;
- y += yinc1;
- } else {
- d += dinc2;
- x += xinc2;
- y += yinc2;
- }
- }
- }
- /*
- * usbvideo_TestPattern()
- *
- * Procedure forms a test pattern (yellow grid on blue background).
- *
- * Parameters:
- * fullframe: if TRUE then entire frame is filled, otherwise the procedure
- * continues from the current scanline.
- * pmode 0: fill the frame with solid blue color (like on VCR or TV)
- * 1: Draw a colored grid
- *
- * History:
- * 01-Feb-2000 Created.
- */
- void usbvideo_TestPattern(uvd_t *uvd, int fullframe, int pmode)
- {
- static const char proc[] = "usbvideo_TestPattern";
- usbvideo_frame_t *frame;
- int num_cell = 0;
- int scan_length = 0;
- static int num_pass = 0;
- if (uvd == NULL) {
- err("%s: uvd == NULL", proc);
- return;
- }
- if ((uvd->curframe < 0) || (uvd->curframe >= USBVIDEO_NUMFRAMES)) {
- err("%s: uvd->curframe=%d.", proc, uvd->curframe);
- return;
- }
- /* Grab the current frame */
- frame = &uvd->frame[uvd->curframe];
- /* Optionally start at the beginning */
- if (fullframe) {
- frame->curline = 0;
- frame->seqRead_Length = 0;
- }
- #if 0
- { /* For debugging purposes only */
- char tmp[20];
- usbvideo_VideosizeToString(tmp, sizeof(tmp), frame->request);
- info("testpattern: frame=%s", tmp);
- }
- #endif
- /* Form every scan line */
- for (; frame->curline < VIDEOSIZE_Y(frame->request); frame->curline++) {
- int i;
- unsigned char *f = frame->data +
- (VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL * frame->curline);
- for (i=0; i < VIDEOSIZE_X(frame->request); i++) {
- unsigned char cb=0x80;
- unsigned char cg = 0;
- unsigned char cr = 0;
- if (pmode == 1) {
- if (frame->curline % 32 == 0)
- cb = 0, cg = cr = 0xFF;
- else if (i % 32 == 0) {
- if (frame->curline % 32 == 1)
- num_cell++;
- cb = 0, cg = cr = 0xFF;
- } else {
- cb = ((num_cell*7) + num_pass) & 0xFF;
- cg = ((num_cell*5) + num_pass*2) & 0xFF;
- cr = ((num_cell*3) + num_pass*3) & 0xFF;
- }
- } else {
- /* Just the blue screen */
- }
-
- *f++ = cb;
- *f++ = cg;
- *f++ = cr;
- scan_length += 3;
- }
- }
- frame->frameState = FrameState_Done;
- frame->seqRead_Length += scan_length;
- ++num_pass;
- /* We do this unconditionally, regardless of FLAGS_OVERLAY_STATS */
- usbvideo_OverlayStats(uvd, frame);
- }
- /*
- * usbvideo_HexDump()
- *
- * A debugging tool. Prints hex dumps.
- *
- * History:
- * 29-Jul-2000 Added printing of offsets.
- */
- void usbvideo_HexDump(const unsigned char *data, int len)
- {
- const int bytes_per_line = 32;
- char tmp[128]; /* 32*3 + 5 */
- int i, k;
- for (i=k=0; len > 0; i++, len--) {
- if (i > 0 && ((i % bytes_per_line) == 0)) {
- printk("%sn", tmp);
- k=0;
- }
- if ((i % bytes_per_line) == 0)
- k += sprintf(&tmp[k], "%04x: ", i);
- k += sprintf(&tmp[k], "%02x ", data[i]);
- }
- if (k > 0)
- printk("%sn", tmp);
- }
- /* Debugging aid */
- void usbvideo_SayAndWait(const char *what)
- {
- wait_queue_head_t wq;
- init_waitqueue_head(&wq);
- info("Say: %s", what);
- interruptible_sleep_on_timeout (&wq, HZ*3); /* Timeout */
- }
- /* ******************************************************************** */
- static void usbvideo_ClientIncModCount(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_ClientIncModCount";
- if (uvd == NULL) {
- err("%s: uvd == NULL", proc);
- return;
- }
- if (uvd->handle == NULL) {
- err("%s: uvd->handle == NULL", proc);
- return;
- }
- if (uvd->handle->md_module == NULL) {
- err("%s: uvd->handle->md_module == NULL", proc);
- return;
- }
- __MOD_INC_USE_COUNT(uvd->handle->md_module);
- }
- static void usbvideo_ClientDecModCount(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_ClientDecModCount";
- if (uvd == NULL) {
- err("%s: uvd == NULL", proc);
- return;
- }
- if (uvd->handle == NULL) {
- err("%s: uvd->handle == NULL", proc);
- return;
- }
- if (uvd->handle->md_module == NULL) {
- err("%s: uvd->handle->md_module == NULL", proc);
- return;
- }
- __MOD_DEC_USE_COUNT(uvd->handle->md_module);
- }
- int usbvideo_register(
- usbvideo_t **pCams,
- const int num_cams,
- const int num_extra,
- const char *driverName,
- const usbvideo_cb_t *cbTbl,
- struct module *md )
- {
- static const char proc[] = "usbvideo_register";
- usbvideo_t *cams;
- int i, base_size;
- /* Check parameters for sanity */
- if ((num_cams <= 0) || (pCams == NULL) || (cbTbl == NULL)) {
- err("%s: Illegal call", proc);
- return -EINVAL;
- }
- /* Check registration callback - must be set! */
- if (cbTbl->probe == NULL) {
- err("%s: probe() is required!", proc);
- return -EINVAL;
- }
- base_size = num_cams * sizeof(uvd_t) + sizeof(usbvideo_t);
- cams = (usbvideo_t *) kmalloc(base_size, GFP_KERNEL);
- if (cams == NULL) {
- err("Failed to allocate %d. bytes for usbvideo_t", base_size);
- return -ENOMEM;
- }
- dbg("%s: Allocated $%p (%d. bytes) for %d. cameras",
- proc, cams, base_size, num_cams);
- memset(cams, 0, base_size);
- /* Copy callbacks, apply defaults for those that are not set */
- memmove(&cams->cb, cbTbl, sizeof(cams->cb));
- if (cams->cb.getFrame == NULL)
- cams->cb.getFrame = usbvideo_GetFrame;
- if (cams->cb.disconnect == NULL)
- cams->cb.disconnect = usbvideo_Disconnect;
- #if USES_PROC_FS
- /*
- * If both /proc fs callbacks are NULL then we assume that the driver
- * does not need procfs services at all. Leave them NULL.
- */
- cams->uses_procfs = (cams->cb.procfs_read != NULL) || (cams->cb.procfs_write == NULL);
- if (cams->uses_procfs) {
- if (cams->cb.procfs_read == NULL)
- cams->cb.procfs_read = usbvideo_default_procfs_read_proc;
- if (cams->cb.procfs_write == NULL)
- cams->cb.procfs_write = usbvideo_default_procfs_write_proc;
- }
- #else /* !USES_PROC_FS */
- /* Report a warning so that user knows why there is no /proc entries */
- if ((cams->cb.procfs_read != NULL) || (cams->cb.procfs_write == NULL)) {
- dbg("%s: /proc fs support requested but not configured!", proc);
- }
- #endif
- cams->num_cameras = num_cams;
- cams->cam = (uvd_t *) &cams[1];
- cams->md_module = md;
- if (cams->md_module == NULL)
- warn("%s: module == NULL!", proc);
- init_MUTEX(&cams->lock); /* to 1 == available */
- for (i = 0; i < num_cams; i++) {
- uvd_t *up = &cams->cam[i];
- up->handle = cams;
- /* Allocate user_data separately because of kmalloc's limits */
- if (num_extra > 0) {
- up->user_size = num_cams * num_extra;
- up->user_data = (char *) kmalloc(up->user_size, GFP_KERNEL);
- if (up->user_data == NULL) {
- up->user_size = 0;
- err("%s: Failed to allocate user_data (%d. bytes)",
- proc, up->user_size);
- return -ENOMEM;
- }
- dbg("%s: Allocated cams[%d].user_data=$%p (%d. bytes)",
- proc, i, up->user_data, up->user_size);
- }
- }
- /*
- * Register ourselves with USB stack.
- */
- strcpy(cams->drvName, (driverName != NULL) ? driverName : "Unknown");
- cams->usbdrv.name = cams->drvName;
- cams->usbdrv.probe = cams->cb.probe;
- cams->usbdrv.disconnect = cams->cb.disconnect;
- #if USES_PROC_FS
- if (cams->uses_procfs) {
- dbg("%s: Creating /proc filesystem entries.", proc);
- usbvideo_procfs_level1_create(cams);
- }
- #endif
- /*
- * Update global handle to usbvideo. This is very important
- * because probe() can be called before usb_register() returns.
- * If the handle is not yet updated then the probe() will fail.
- */
- *pCams = cams;
- usb_register(&cams->usbdrv);
- return 0;
- }
- /*
- * usbvideo_Deregister()
- *
- * Procedure frees all usbvideo and user data structures. Be warned that
- * if you had some dynamically allocated components in ->user field then
- * you should free them before calling here.
- */
- void usbvideo_Deregister(usbvideo_t **pCams)
- {
- static const char proc[] = "usbvideo_deregister";
- usbvideo_t *cams;
- int i;
- if (pCams == NULL) {
- err("%s: pCams == NULL", proc);
- return;
- }
- cams = *pCams;
- if (cams == NULL) {
- err("%s: cams == NULL", proc);
- return;
- }
- #if USES_PROC_FS
- if (cams->uses_procfs) {
- dbg("%s: Deregistering filesystem entries.", proc);
- usbvideo_procfs_level1_destroy(cams);
- }
- #endif
- dbg("%s: Deregistering %s driver.", proc, cams->drvName);
- usb_deregister(&cams->usbdrv);
- dbg("%s: Deallocating cams=$%p (%d. cameras)", proc, cams, cams->num_cameras);
- for (i=0; i < cams->num_cameras; i++) {
- uvd_t *up = &cams->cam[i];
- int warning = 0;
- if (up->user_data != NULL) {
- if (up->user_size <= 0)
- ++warning;
- } else {
- if (up->user_size > 0)
- ++warning;
- }
- if (warning) {
- err("%s: Warning: user_data=$%p user_size=%d.",
- proc, up->user_data, up->user_size);
- } else {
- dbg("%s: Freeing %d. $%p->user_data=$%p",
- proc, i, up, up->user_data);
- kfree(up->user_data);
- }
- }
- /* Whole array was allocated in one chunk */
- dbg("%s: Freed %d uvd_t structures",
- proc, cams->num_cameras);
- kfree(cams);
- *pCams = NULL;
- }
- /*
- * usbvideo_Disconnect()
- *
- * This procedure stops all driver activity. Deallocation of
- * the interface-private structure (pointed by 'ptr') is done now
- * (if we don't have any open files) or later, when those files
- * are closed. After that driver should be removable.
- *
- * This code handles surprise removal. The uvd->user is a counter which
- * increments on open() and decrements on close(). If we see here that
- * this counter is not 0 then we have a client who still has us opened.
- * We set uvd->remove_pending flag as early as possible, and after that
- * all access to the camera will gracefully fail. These failures should
- * prompt client to (eventually) close the video device, and then - in
- * usbvideo_v4l_close() - we decrement uvd->uvd_used and usage counter.
- *
- * History:
- * 22-Jan-2000 Added polling of MOD_IN_USE to delay removal until all users gone.
- * 27-Jan-2000 Reworked to allow pending disconnects; see xxx_close()
- * 24-May-2000 Corrected to prevent race condition (MOD_xxx_USE_COUNT).
- * 19-Oct-2000 Moved to usbvideo module.
- */
- void usbvideo_Disconnect(struct usb_device *dev, void *ptr)
- {
- static const char proc[] = "usbvideo_Disconnect";
- uvd_t *uvd = (uvd_t *) ptr;
- int i;
- if ((dev == NULL) || (uvd == NULL)) {
- err("%s($%p,$%p): Illegal call.", proc, dev, ptr);
- return;
- }
- usbvideo_ClientIncModCount(uvd);
- if (uvd->debug > 0)
- info("%s(%p,%p.)", proc, dev, ptr);
- down(&uvd->lock);
- uvd->remove_pending = 1; /* Now all ISO data will be ignored */
- /* At this time we ask to cancel outstanding URBs */
- usbvideo_StopDataPump(uvd);
- for (i=0; i < USBVIDEO_NUMSBUF; i++)
- usb_free_urb(uvd->sbuf[i].urb);
- usb_dec_dev_use(uvd->dev);
- uvd->dev = NULL; /* USB device is no more */
- if (uvd->user)
- info("%s: In use, disconnect pending.", proc);
- else
- usbvideo_CameraRelease(uvd);
- up(&uvd->lock);
- info("USB camera disconnected.");
- usbvideo_ClientDecModCount(uvd);
- }
- /*
- * usbvideo_CameraRelease()
- *
- * This code does final release of uvd_t. This happens
- * after the device is disconnected -and- all clients
- * closed their files.
- *
- * History:
- * 27-Jan-2000 Created.
- */
- void usbvideo_CameraRelease(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_CameraRelease";
- if (uvd == NULL) {
- err("%s: Illegal call", proc);
- return;
- }
- video_unregister_device(&uvd->vdev);
- if (uvd->debug > 0)
- info("%s: Video unregistered.", proc);
- #if USES_PROC_FS
- assert(uvd->handle != NULL);
- if (uvd->handle->uses_procfs) {
- dbg("%s: Removing /proc/%s/ filesystem entries.", proc, uvd->handle->drvName);
- usbvideo_procfs_level2_destroy(uvd);
- }
- #endif
- RingQueue_Free(&uvd->dp);
- if (VALID_CALLBACK(uvd, userFree))
- GET_CALLBACK(uvd, userFree)(uvd);
- uvd->uvd_used = 0; /* This is atomic, no need to take mutex */
- }
- /*
- * usbvideo_find_struct()
- *
- * This code searches the array of preallocated (static) structures
- * and returns index of the first one that isn't in use. Returns -1
- * if there are no free structures.
- *
- * History:
- * 27-Jan-2000 Created.
- */
- static int usbvideo_find_struct(usbvideo_t *cams)
- {
- int u, rv = -1;
- if (cams == NULL) {
- err("No usbvideo_t handle?");
- return -1;
- }
- down(&cams->lock);
- for (u = 0; u < cams->num_cameras; u++) {
- uvd_t *uvd = &cams->cam[u];
- if (!uvd->uvd_used) /* This one is free */
- {
- uvd->uvd_used = 1; /* In use now */
- init_MUTEX(&uvd->lock); /* to 1 == available */
- uvd->dev = NULL;
- rv = u;
- break;
- }
- }
- up(&cams->lock);
- return rv;
- }
- uvd_t *usbvideo_AllocateDevice(usbvideo_t *cams)
- {
- int i, devnum;
- uvd_t *uvd = NULL;
- if (cams == NULL) {
- err("No usbvideo_t handle?");
- return NULL;
- }
- devnum = usbvideo_find_struct(cams);
- if (devnum == -1) {
- err("IBM USB camera driver: Too many devices!");
- return NULL;
- }
- uvd = &cams->cam[devnum];
- dbg("Device entry #%d. at $%p", devnum, uvd);
- /* Not relying upon caller we increase module counter ourselves */
- usbvideo_ClientIncModCount(uvd);
- down(&uvd->lock);
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- uvd->sbuf[i].urb = usb_alloc_urb(FRAMES_PER_DESC);
- if (uvd->sbuf[i].urb == NULL) {
- err("usb_alloc_urb(%d.) failed.", FRAMES_PER_DESC);
- uvd->uvd_used = 0;
- uvd = NULL;
- goto allocate_done;
- }
- }
- uvd->user=0;
- uvd->remove_pending = 0;
- uvd->last_error = 0;
- RingQueue_Initialize(&uvd->dp);
- /* Initialize video device structure */
- memset(&uvd->vdev, 0, sizeof(uvd->vdev));
- i = sprintf(uvd->vdev.name, "%s USB Camera", cams->drvName);
- if (i >= sizeof(uvd->vdev.name)) {
- err("Wrote too much into uvd->vdev.name, expect trouble!");
- }
- uvd->vdev.type = VID_TYPE_CAPTURE;
- uvd->vdev.hardware = VID_HARDWARE_CPIA;
- uvd->vdev.open = usbvideo_v4l_open;
- uvd->vdev.close = usbvideo_v4l_close;
- uvd->vdev.read = usbvideo_v4l_read;
- uvd->vdev.write = usbvideo_v4l_write;
- uvd->vdev.ioctl = usbvideo_v4l_ioctl;
- uvd->vdev.mmap = usbvideo_v4l_mmap;
- uvd->vdev.initialize = usbvideo_v4l_initialize;
- /*
- * The client is free to overwrite those because we
- * return control to the client's probe function right now.
- */
- allocate_done:
- up (&uvd->lock);
- usbvideo_ClientDecModCount(uvd);
- return uvd;
- }
- int usbvideo_RegisterVideoDevice(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_RegisterVideoDevice";
- char tmp1[20], tmp2[20]; /* Buffers for printing */
- if (uvd == NULL) {
- err("%s: Illegal call.", proc);
- return -EINVAL;
- }
- if (uvd->video_endp == 0) {
- info("%s: No video endpoint specified; data pump disabled.", proc);
- }
- if (uvd->paletteBits == 0) {
- err("%s: No palettes specified!", proc);
- return -EINVAL;
- }
- if (uvd->defaultPalette == 0) {
- info("%s: No default palette!", proc);
- }
- uvd->max_frame_size = VIDEOSIZE_X(uvd->canvas) *
- VIDEOSIZE_Y(uvd->canvas) * V4L_BYTES_PER_PIXEL;
- usbvideo_VideosizeToString(tmp1, sizeof(tmp1), uvd->videosize);
- usbvideo_VideosizeToString(tmp2, sizeof(tmp2), uvd->canvas);
- if (uvd->debug > 0) {
- info("%s: iface=%d. endpoint=$%02x paletteBits=$%08lx",
- proc, uvd->iface, uvd->video_endp, uvd->paletteBits);
- }
- if (video_register_device(&uvd->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
- err("%s: video_register_device failed", proc);
- return -EPIPE;
- }
- if (uvd->debug > 1) {
- info("%s: video_register_device() successful", proc);
- }
- if (uvd->dev == NULL) {
- err("%s: uvd->dev == NULL", proc);
- return -EINVAL;
- }
- info("%s on /dev/video%d: canvas=%s videosize=%s",
- (uvd->handle != NULL) ? uvd->handle->drvName : "???",
- uvd->vdev.minor, tmp2, tmp1);
- #if USES_PROC_FS
- assert(uvd->handle != NULL);
- if (uvd->handle->uses_procfs) {
- if (uvd->debug > 0) {
- info("%s: Creating /proc/video/%s/ filesystem entries.",
- proc, uvd->handle->drvName);
- }
- usbvideo_procfs_level2_create(uvd);
- }
- #endif
- usb_inc_dev_use(uvd->dev);
- return 0;
- }
- /* ******************************************************************** */
- int usbvideo_v4l_initialize(struct video_device *dev)
- {
- return 0;
- }
- long usbvideo_v4l_write(struct video_device *dev, const char *buf,
- unsigned long count, int noblock)
- {
- return -EINVAL;
- }
- int usbvideo_v4l_mmap(struct video_device *dev, const char *adr, unsigned long size)
- {
- uvd_t *uvd = (uvd_t *) dev;
- unsigned long start = (unsigned long) adr;
- unsigned long page, pos;
- if (!CAMERA_IS_OPERATIONAL(uvd))
- return -EFAULT;
- if (size > (((2 * uvd->max_frame_size) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)))
- return -EINVAL;
- pos = (unsigned long) uvd->fbuf;
- while (size > 0) {
- page = usbvideo_kvirt_to_pa(pos);
- if (remap_page_range(start, page, PAGE_SIZE, PAGE_SHARED))
- return -EAGAIN;
- start += PAGE_SIZE;
- pos += PAGE_SIZE;
- if (size > PAGE_SIZE)
- size -= PAGE_SIZE;
- else
- size = 0;
- }
- return 0;
- }
- /*
- * usbvideo_v4l_open()
- *
- * This is part of Video 4 Linux API. The driver can be opened by one
- * client only (checks internal counter 'uvdser'). The procedure
- * then allocates buffers needed for video processing.
- *
- * History:
- * 22-Jan-2000 Rewrote, moved scratch buffer allocation here. Now the
- * camera is also initialized here (once per connect), at
- * expense of V4L client (it waits on open() call).
- * 27-Jan-2000 Used USBVIDEO_NUMSBUF as number of URB buffers.
- * 24-May-2000 Corrected to prevent race condition (MOD_xxx_USE_COUNT).
- */
- int usbvideo_v4l_open(struct video_device *dev, int flags)
- {
- static const char proc[] = "usbvideo_v4l_open";
- uvd_t *uvd = (uvd_t *) dev;
- const int sb_size = FRAMES_PER_DESC * uvd->iso_packet_len;
- int i, errCode = 0;
- if (uvd->debug > 1)
- info("%s($%p,$%08x", proc, dev, flags);
- usbvideo_ClientIncModCount(uvd);
- down(&uvd->lock);
- if (uvd->user) {
- err("%s: Someone tried to open an already opened device!", proc);
- errCode = -EBUSY;
- } else {
- /* Clear statistics */
- memset(&uvd->stats, 0, sizeof(uvd->stats));
- /* Clean pointers so we know if we allocated something */
- for (i=0; i < USBVIDEO_NUMSBUF; i++)
- uvd->sbuf[i].data = NULL;
- /* Allocate memory for the frame buffers */
- uvd->fbuf_size = USBVIDEO_NUMFRAMES * uvd->max_frame_size;
- uvd->fbuf = usbvideo_rvmalloc(uvd->fbuf_size);
- RingQueue_Allocate(&uvd->dp, 128*1024); /* FIXME #define */
- if ((uvd->fbuf == NULL) ||
- (!RingQueue_IsAllocated(&uvd->dp))) {
- err("%s: Failed to allocate fbuf or dp", proc);
- errCode = -ENOMEM;
- } else {
- /* Allocate all buffers */
- for (i=0; i < USBVIDEO_NUMFRAMES; i++) {
- uvd->frame[i].frameState = FrameState_Unused;
- uvd->frame[i].data = uvd->fbuf + i*(uvd->max_frame_size);
- /*
- * Set default sizes in case IOCTL (VIDIOCMCAPTURE)
- * is not used (using read() instead).
- */
- uvd->frame[i].canvas = uvd->canvas;
- uvd->frame[i].seqRead_Index = 0;
- }
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- uvd->sbuf[i].data = kmalloc(sb_size, GFP_KERNEL);
- if (uvd->sbuf[i].data == NULL) {
- errCode = -ENOMEM;
- break;
- }
- }
- }
- if (errCode != 0) {
- /* Have to free all that memory */
- if (uvd->fbuf != NULL) {
- usbvideo_rvfree(uvd->fbuf, uvd->fbuf_size);
- uvd->fbuf = NULL;
- }
- RingQueue_Free(&uvd->dp);
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- if (uvd->sbuf[i].data != NULL) {
- kfree (uvd->sbuf[i].data);
- uvd->sbuf[i].data = NULL;
- }
- }
- }
- }
- /* If so far no errors then we shall start the camera */
- if (errCode == 0) {
- /* Start data pump if we have valid endpoint */
- if (uvd->video_endp != 0)
- errCode = usbvideo_StartDataPump(uvd);
- if (errCode == 0) {
- if (VALID_CALLBACK(uvd, setupOnOpen)) {
- if (uvd->debug > 1)
- info("%s: setupOnOpen callback", proc);
- errCode = GET_CALLBACK(uvd, setupOnOpen)(uvd);
- if (errCode < 0) {
- err("%s: setupOnOpen callback failed (%d.).",
- proc, errCode);
- } else if (uvd->debug > 1) {
- info("%s: setupOnOpen callback successful", proc);
- }
- }
- if (errCode == 0) {
- uvd->settingsAdjusted = 0;
- if (uvd->debug > 1)
- info("%s: Open succeeded.", proc);
- uvd->user++;
- }
- }
- }
- up(&uvd->lock);
- if (errCode != 0)
- usbvideo_ClientDecModCount(uvd);
- if (uvd->debug > 0)
- info("%s: Returning %d.", proc, errCode);
- return errCode;
- }
- /*
- * usbvideo_v4l_close()
- *
- * This is part of Video 4 Linux API. The procedure
- * stops streaming and deallocates all buffers that were earlier
- * allocated in usbvideo_v4l_open().
- *
- * History:
- * 22-Jan-2000 Moved scratch buffer deallocation here.
- * 27-Jan-2000 Used USBVIDEO_NUMSBUF as number of URB buffers.
- * 24-May-2000 Moved MOD_DEC_USE_COUNT outside of code that can sleep.
- */
- void usbvideo_v4l_close(struct video_device *dev)
- {
- static const char proc[] = "usbvideo_v4l_close";
- uvd_t *uvd = (uvd_t *)dev;
- int i;
- if (uvd->debug > 1)
- info("%s($%p)", proc, dev);
- down(&uvd->lock);
- usbvideo_StopDataPump(uvd);
- usbvideo_rvfree(uvd->fbuf, uvd->fbuf_size);
- uvd->fbuf = NULL;
- RingQueue_Free(&uvd->dp);
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- kfree(uvd->sbuf[i].data);
- uvd->sbuf[i].data = NULL;
- }
- #if USBVIDEO_REPORT_STATS
- usbvideo_ReportStatistics(uvd);
- #endif
- uvd->user--;
- if (uvd->remove_pending) {
- if (uvd->debug > 0)
- info("usbvideo_v4l_close: Final disconnect.");
- usbvideo_CameraRelease(uvd);
- }
- up(&uvd->lock);
- usbvideo_ClientDecModCount(uvd);
- if (uvd->debug > 1)
- info("%s: Completed.", proc);
- }
- /*
- * usbvideo_v4l_ioctl()
- *
- * This is part of Video 4 Linux API. The procedure handles ioctl() calls.
- *
- * History:
- * 22-Jan-2000 Corrected VIDIOCSPICT to reject unsupported settings.
- */
- int usbvideo_v4l_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
- {
- uvd_t *uvd = (uvd_t *)dev;
- if (!CAMERA_IS_OPERATIONAL(uvd))
- return -EFAULT;
- switch (cmd) {
- case VIDIOCGCAP:
- {
- if (copy_to_user(arg, &uvd->vcap, sizeof(uvd->vcap)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCGCHAN:
- {
- if (copy_to_user(arg, &uvd->vchan, sizeof(uvd->vchan)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSCHAN:
- { /* Not used but we return success */
- int v;
- if (copy_from_user(&v, arg, sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCGPICT:
- {
- if (copy_to_user(arg, &uvd->vpic, sizeof(uvd->vpic)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSPICT:
- {
- struct video_picture tmp;
- /*
- * Use temporary 'video_picture' structure to preserve our
- * own settings (such as color depth, palette) that we
- * aren't allowing everyone (V4L client) to change.
- */
- if (copy_from_user(&tmp, arg, sizeof(tmp)))
- return -EFAULT;
- uvd->vpic.brightness = tmp.brightness;
- uvd->vpic.hue = tmp.hue;
- uvd->vpic.colour = tmp.colour;
- uvd->vpic.contrast = tmp.contrast;
- uvd->settingsAdjusted = 0; /* Will force new settings */
- return 0;
- }
- case VIDIOCSWIN:
- {
- struct video_window vw;
- if (copy_from_user(&vw, arg, sizeof(vw)))
- return -EFAULT;
- if (vw.flags)
- return -EINVAL;
- if (vw.clipcount)
- return -EINVAL;
- if (vw.width != VIDEOSIZE_X(uvd->canvas))
- return -EINVAL;
- if (vw.height != VIDEOSIZE_Y(uvd->canvas))
- return -EINVAL;
- return 0;
- }
- case VIDIOCGWIN:
- {
- struct video_window vw;
- vw.x = 0;
- vw.y = 0;
- vw.width = VIDEOSIZE_X(uvd->canvas);
- vw.height = VIDEOSIZE_Y(uvd->canvas);
- vw.chromakey = 0;
- if (VALID_CALLBACK(uvd, getFPS))
- vw.flags = GET_CALLBACK(uvd, getFPS)(uvd);
- else
- vw.flags = 10; /* FIXME: do better! */
- if (copy_to_user(arg, &vw, sizeof(vw)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCGMBUF:
- {
- struct video_mbuf vm;
- memset(&vm, 0, sizeof(vm));
- vm.size = uvd->max_frame_size * 2;
- vm.frames = 2;
- vm.offsets[0] = 0;
- vm.offsets[1] = uvd->max_frame_size;
- if (copy_to_user((void *)arg, (void *)&vm, sizeof(vm)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCMCAPTURE:
- {
- struct video_mmap vm;
- if (copy_from_user((void *)&vm, (void *)arg, sizeof(vm))) {
- err("VIDIOCMCAPTURE: copy_from_user() failed.");
- return -EFAULT;
- }
- if (uvd->debug >= 1) {
- info("VIDIOCMCAPTURE: frame=%d. size=%dx%d, format=%d.",
- vm.frame, vm.width, vm.height, vm.format);
- }
- /*
- * Check if the requested size is supported. If the requestor
- * requests too big a frame then we may be tricked into accessing
- * outside of own preallocated frame buffer (in uvd->frame).
- * This will cause oops or a security hole. Theoretically, we
- * could only clamp the size down to acceptable bounds, but then
- * we'd need to figure out how to insert our smaller buffer into
- * larger caller's buffer... this is not an easy question. So we
- * here just flatly reject too large requests, assuming that the
- * caller will resubmit with smaller size. Callers should know
- * what size we support (returned by VIDIOCGCAP). However vidcat,
- * for one, does not care and allows to ask for any size.
- */
- if ((vm.width > VIDEOSIZE_X(uvd->canvas)) ||
- (vm.height > VIDEOSIZE_Y(uvd->canvas))) {
- if (uvd->debug > 0) {
- info("VIDIOCMCAPTURE: Size=%dx%d too large; "
- "allowed only up to %ldx%ld", vm.width, vm.height,
- VIDEOSIZE_X(uvd->canvas), VIDEOSIZE_Y(uvd->canvas));
- }
- return -EINVAL;
- }
- /* Check if the palette is supported */
- if (((1L << vm.format) & uvd->paletteBits) == 0) {
- if (uvd->debug > 0) {
- info("VIDIOCMCAPTURE: format=%d. not supported"
- " (paletteBits=$%08lx)",
- vm.format, uvd->paletteBits);
- }
- return -EINVAL;
- }
- if ((vm.frame != 0) && (vm.frame != 1)) {
- err("VIDIOCMCAPTURE: vm.frame=%d. !E [0,1]", vm.frame);
- return -EINVAL;
- }
- if (uvd->frame[vm.frame].frameState == FrameState_Grabbing) {
- /* Not an error - can happen */
- }
- uvd->frame[vm.frame].request = VIDEOSIZE(vm.width, vm.height);
- uvd->frame[vm.frame].palette = vm.format;
- /* Mark it as ready */
- uvd->frame[vm.frame].frameState = FrameState_Ready;
- return usbvideo_NewFrame(uvd, vm.frame);
- }
- case VIDIOCSYNC:
- {
- int frameNum, ret;
- if (copy_from_user((void *)&frameNum, arg, sizeof(frameNum))) {
- err("VIDIOCSYNC: copy_from_user() failed.");
- return -EFAULT;
- }
- if(frameNum < 0 || frameNum >= USBVIDEO_NUMFRAMES)
- return -EINVAL;
-
- if (uvd->debug >= 1)
- info("VIDIOCSYNC: syncing to frame %d.", frameNum);
- if (uvd->flags & FLAGS_NO_DECODING)
- ret = usbvideo_GetFrame(uvd, frameNum);
- else if (VALID_CALLBACK(uvd, getFrame)) {
- ret = GET_CALLBACK(uvd, getFrame)(uvd, frameNum);
- if ((ret < 0) && (uvd->debug >= 1)) {
- err("VIDIOCSYNC: getFrame() returned %d.", ret);
- }
- } else {
- err("VIDIOCSYNC: getFrame is not set");
- ret = -EFAULT;
- }
- /*
- * The frame is in FrameState_Done_Hold state. Release it
- * right now because its data is already mapped into
- * the user space and it's up to the application to
- * make use of it until it asks for another frame.
- */
- uvd->frame[frameNum].frameState = FrameState_Unused;
- return ret;
- }
- case VIDIOCGFBUF:
- {
- struct video_buffer vb;
- memset(&vb, 0, sizeof(vb));
- vb.base = NULL; /* frame buffer not supported, not used */
- if (copy_to_user((void *)arg, (void *)&vb, sizeof(vb)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCKEY:
- return 0;
- case VIDIOCCAPTURE:
- return -EINVAL;
- case VIDIOCSFBUF:
- case VIDIOCGTUNER:
- case VIDIOCSTUNER:
- case VIDIOCGFREQ:
- case VIDIOCSFREQ:
- case VIDIOCGAUDIO:
- case VIDIOCSAUDIO:
- return -EINVAL;
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
- }
- /*
- * usbvideo_v4l_read()
- *
- * This is mostly boring stuff. We simply ask for a frame and when it
- * arrives copy all the video data from it into user space. There is
- * no obvious need to override this method.
- *
- * History:
- * 20-Oct-2000 Created.
- * 01-Nov-2000 Added mutex (uvd->lock).
- */
- long usbvideo_v4l_read(struct video_device *dev, char *buf, unsigned long count, int noblock)
- {
- static const char proc[] = "usbvideo_v4l_read";
- uvd_t *uvd = (uvd_t *) dev;
- int frmx = -1;
- usbvideo_frame_t *frame;
- if (!CAMERA_IS_OPERATIONAL(uvd) || (buf == NULL))
- return -EFAULT;
- if (uvd->debug >= 1)
- info("%s: %ld. bytes, noblock=%d.", proc, count, noblock);
- down(&uvd->lock);
- /* See if a frame is completed, then use it. */
- if ((uvd->frame[0].frameState == FrameState_Done) ||
- (uvd->frame[0].frameState == FrameState_Done_Hold) ||
- (uvd->frame[0].frameState == FrameState_Error)) {
- frmx = 0;
- } else if ((uvd->frame[1].frameState >= FrameState_Done) ||
- (uvd->frame[1].frameState == FrameState_Done_Hold) ||
- (uvd->frame[1].frameState >= FrameState_Done)) {
- frmx = 1;
- }
- /* FIXME: If we don't start a frame here then who ever does? */
- if (noblock && (frmx == -1)) {
- count = -EAGAIN;
- goto read_done;
- }
- /*
- * If no FrameState_Done, look for a FrameState_Grabbing state.
- * See if a frame is in process (grabbing), then use it.
- * We will need to wait until it becomes cooked, of course.
- */
- if (frmx == -1) {
- if (uvd->frame[0].frameState == FrameState_Grabbing)
- frmx = 0;
- else if (uvd->frame[1].frameState == FrameState_Grabbing)
- frmx = 1;
- }
- /*
- * If no frame is active, start one. We don't care which one
- * it will be, so #0 is as good as any.
- * In read access mode we don't have convenience of VIDIOCMCAPTURE
- * to specify the requested palette (video format) on per-frame
- * basis. This means that we have to return data in -some- format
- * and just hope that the client knows what to do with it.
- * The default format is configured in uvd->defaultPalette field
- * as one of VIDEO_PALETTE_xxx values. We stuff it into the new
- * frame and initiate the frame filling process.
- */
- if (frmx == -1) {
- if (uvd->defaultPalette == 0) {
- err("%s: No default palette; don't know what to do!", proc);
- count = -EFAULT;
- goto read_done;
- }
- frmx = 0;
- /*
- * We have no per-frame control over video size.
- * Therefore we only can use whatever size was
- * specified as default.
- */
- uvd->frame[frmx].request = uvd->videosize;
- uvd->frame[frmx].palette = uvd->defaultPalette;
- uvd->frame[frmx].frameState = FrameState_Ready;
- usbvideo_NewFrame(uvd, frmx);
- /* Now frame 0 is supposed to start filling... */
- }
- /*
- * Get a pointer to the active frame. It is either previously
- * completed frame or frame in progress but not completed yet.
- */
- frame = &uvd->frame[frmx];
- /*
- * Sit back & wait until the frame gets filled and postprocessed.
- * If we fail to get the picture [in time] then return the error.
- * In this call we specify that we want the frame to be waited for,
- * postprocessed and switched into FrameState_Done_Hold state. This
- * state is used to hold the frame as "fully completed" between
- * subsequent partial reads of the same frame.
- */
- if (frame->frameState != FrameState_Done_Hold) {
- long rv = -EFAULT;
- if (uvd->flags & FLAGS_NO_DECODING)
- rv = usbvideo_GetFrame(uvd, frmx);
- else if (VALID_CALLBACK(uvd, getFrame))
- rv = GET_CALLBACK(uvd, getFrame)(uvd, frmx);
- else
- err("getFrame is not set");
- if ((rv != 0) || (frame->frameState != FrameState_Done_Hold)) {
- count = rv;
- goto read_done;
- }
- }
- /*
- * Copy bytes to user space. We allow for partial reads, which
- * means that the user application can request read less than
- * the full frame size. It is up to the application to issue
- * subsequent calls until entire frame is read.
- *
- * First things first, make sure we don't copy more than we
- * have - even if the application wants more. That would be
- * a big security embarassment!
- */
-
- if (count + frame->seqRead_Index < count)
- {
- count = -EINVAL;
- goto read_done;
- }
- if ((count + frame->seqRead_Index) > frame->seqRead_Length)
- count = frame->seqRead_Length - frame->seqRead_Index;
- /*
- * Copy requested amount of data to user space. We start
- * copying from the position where we last left it, which
- * will be zero for a new frame (not read before).
- */
- if (copy_to_user(buf, frame->data + frame->seqRead_Index, count)) {
- count = -EFAULT;
- goto read_done;
- }
- /* Update last read position */
- frame->seqRead_Index += count;
- if (uvd->debug >= 1) {
- err("%s: {copy} count used=%ld, new seqRead_Index=%ld",
- proc, count, frame->seqRead_Index);
- }
- /* Finally check if the frame is done with and "release" it */
- if (frame->seqRead_Index >= frame->seqRead_Length) {
- /* All data has been read */
- frame->seqRead_Index = 0;
- /* Mark it as available to be used again. */
- uvd->frame[frmx].frameState = FrameState_Unused;
- if (usbvideo_NewFrame(uvd, frmx ? 0 : 1)) {
- err("%s: usbvideo_NewFrame failed.", proc);
- }
- }
- read_done:
- up(&uvd->lock);
- return count;
- }
- /*
- * Make all of the blocks of data contiguous
- */
- static int usbvideo_CompressIsochronous(uvd_t *uvd, struct urb *urb)
- {
- char *cdata;
- int i, totlen = 0;
- for (i = 0; i < urb->number_of_packets; i++) {
- int n = urb->iso_frame_desc[i].actual_length;
- int st = urb->iso_frame_desc[i].status;
- cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
- /* Detect and ignore errored packets */
- if (st < 0) {
- if (uvd->debug >= 1)
- err("Data error: packet=%d. len=%d. status=%d.", i, n, st);
- uvd->stats.iso_err_count++;
- continue;
- }
- /* Detect and ignore empty packets */
- if (n <= 0) {
- uvd->stats.iso_skip_count++;
- continue;
- }
- totlen += n; /* Little local accounting */
- RingQueue_Enqueue(&uvd->dp, cdata, n);
- }
- return totlen;
- }
- static void usbvideo_IsocIrq(struct urb *urb)
- {
- int i, len;
- uvd_t *uvd = urb->context;
- /* We don't want to do anything if we are about to be removed! */
- if (!CAMERA_IS_OPERATIONAL(uvd))
- return;
- #if 0
- if (urb->actual_length > 0) {
- info("urb=$%p status=%d. errcount=%d. length=%d.",
- urb, urb->status, urb->error_count, urb->actual_length);
- } else {
- static int c = 0;
- if (c++ % 100 == 0)
- info("No Isoc data");
- }
- #endif
- if (!uvd->streaming) {
- if (uvd->debug >= 1)
- info("Not streaming, but interrupt!");
- return;
- }
-
- uvd->stats.urb_count++;
- if (urb->actual_length <= 0)
- goto urb_done_with;
- /* Copy the data received into ring queue */
- len = usbvideo_CompressIsochronous(uvd, urb);
- uvd->stats.urb_length = len;
- if (len <= 0)
- goto urb_done_with;
- /* Here we got some data */
- uvd->stats.data_count += len;
- RingQueue_WakeUpInterruptible(&uvd->dp);
- urb_done_with:
- for (i = 0; i < FRAMES_PER_DESC; i++) {
- urb->iso_frame_desc[i].status = 0;
- urb->iso_frame_desc[i].actual_length = 0;
- }
- return;
- }
- /*
- * usbvideo_StartDataPump()
- *
- * History:
- * 27-Jan-2000 Used ibmcam->iface, ibmcam->ifaceAltActive instead
- * of hardcoded values. Simplified by using for loop,
- * allowed any number of URBs.
- */
- int usbvideo_StartDataPump(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_StartDataPump";
- struct usb_device *dev = uvd->dev;
- int i, errFlag;
- if (uvd->debug > 1)
- info("%s($%p)", proc, uvd);
- if (!CAMERA_IS_OPERATIONAL(uvd)) {
- err("%s: Camera is not operational",proc);
- return -EFAULT;
- }
- uvd->curframe = -1;
- /* Alternate interface 1 is is the biggest frame size */
- i = usb_set_interface(dev, uvd->iface, uvd->ifaceAltActive);
- if (i < 0) {
- err("%s: usb_set_interface error", proc);
- uvd->last_error = i;
- return -EBUSY;
- }
- if (VALID_CALLBACK(uvd, videoStart))
- GET_CALLBACK(uvd, videoStart)(uvd);
- else
- err("%s: videoStart not set", proc);
- /* We double buffer the Iso lists */
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- int j, k;
- struct urb *urb = uvd->sbuf[i].urb;
- urb->dev = dev;
- urb->context = uvd;
- urb->pipe = usb_rcvisocpipe(dev, uvd->video_endp);
- urb->transfer_flags = USB_ISO_ASAP;
- urb->transfer_buffer = uvd->sbuf[i].data;
- urb->complete = usbvideo_IsocIrq;
- urb->number_of_packets = FRAMES_PER_DESC;
- urb->transfer_buffer_length = uvd->iso_packet_len * FRAMES_PER_DESC;
- for (j=k=0; j < FRAMES_PER_DESC; j++, k += uvd->iso_packet_len) {
- urb->iso_frame_desc[j].offset = k;
- urb->iso_frame_desc[j].length = uvd->iso_packet_len;
- }
- }
- /* Link URBs into a ring so that they invoke each other infinitely */
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- if ((i+1) < USBVIDEO_NUMSBUF)
- uvd->sbuf[i].urb->next = uvd->sbuf[i+1].urb;
- else
- uvd->sbuf[i].urb->next = uvd->sbuf[0].urb;
- }
- /* Submit all URBs */
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- errFlag = usb_submit_urb(uvd->sbuf[i].urb);
- if (errFlag)
- err("%s: usb_submit_isoc(%d) ret %d", proc, i, errFlag);
- }
- uvd->streaming = 1;
- if (uvd->debug > 1)
- info("%s: streaming=1 video_endp=$%02x", proc, uvd->video_endp);
- return 0;
- }
- /*
- * usbvideo_StopDataPump()
- *
- * This procedure stops streaming and deallocates URBs. Then it
- * activates zero-bandwidth alt. setting of the video interface.
- *
- * History:
- * 22-Jan-2000 Corrected order of actions to work after surprise removal.
- * 27-Jan-2000 Used uvd->iface, uvd->ifaceAltInactive instead of hardcoded values.
- */
- void usbvideo_StopDataPump(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_StopDataPump";
- int i, j;
- if (uvd->debug > 1)
- info("%s($%p)", proc, uvd);
- if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
- return;
- /* Unschedule all of the iso td's */
- for (i=0; i < USBVIDEO_NUMSBUF; i++) {
- j = usb_unlink_urb(uvd->sbuf[i].urb);
- if (j < 0)
- err("%s: usb_unlink_urb() error %d.", proc, j);
- }
- if (uvd->debug > 1)
- info("%s: streaming=0", proc);
- uvd->streaming = 0;
- if (!uvd->remove_pending) {
- /* Invoke minidriver's magic to stop the camera */
- if (VALID_CALLBACK(uvd, videoStop))
- GET_CALLBACK(uvd, videoStop)(uvd);
- else
- err("%s: videoStop not set" ,proc);
- /* Set packet size to 0 */
- j = usb_set_interface(uvd->dev, uvd->iface, uvd->ifaceAltInactive);
- if (j < 0) {
- err("%s: usb_set_interface() error %d.", proc, j);
- uvd->last_error = j;
- }
- }
- }
- /*
- * usbvideo_NewFrame()
- *
- * History:
- * 29-Mar-00 Added copying of previous frame into the current one.
- * 6-Aug-00 Added model 3 video sizes, removed redundant width, height.
- */
- int usbvideo_NewFrame(uvd_t *uvd, int framenum)
- {
- usbvideo_frame_t *frame;
- int n;
- if (uvd->debug > 1)
- info("usbvideo_NewFrame($%p,%d.)", uvd, framenum);
- /* If we're not grabbing a frame right now and the other frame is */
- /* ready to be grabbed into, then use it instead */
- if (uvd->curframe != -1)
- return 0;
- /* If necessary we adjust picture settings between frames */
- if (!uvd->settingsAdjusted) {
- if (VALID_CALLBACK(uvd, adjustPicture))
- GET_CALLBACK(uvd, adjustPicture)(uvd);
- uvd->settingsAdjusted = 1;
- }
- n = (framenum - 1 + USBVIDEO_NUMFRAMES) % USBVIDEO_NUMFRAMES;
- if (uvd->frame[n].frameState == FrameState_Ready)
- framenum = n;
- frame = &uvd->frame[framenum];
- frame->frameState = FrameState_Grabbing;
- frame->scanstate = ScanState_Scanning;
- frame->seqRead_Length = 0; /* Accumulated in xxx_parse_data() */
- frame->deinterlace = Deinterlace_None;
- frame->flags = 0; /* No flags yet, up to minidriver (or us) to set them */
- uvd->curframe = framenum;
- /*
- * Normally we would want to copy previous frame into the current one
- * before we even start filling it with data; this allows us to stop
- * filling at any moment; top portion of the frame will be new and
- * bottom portion will stay as it was in previous frame. If we don't
- * do that then missing chunks of video stream will result in flickering
- * portions of old data whatever it was before.
- *
- * If we choose not to copy previous frame (to, for example, save few
- * bus cycles - the frame can be pretty large!) then we have an option
- * to clear the frame before using. If we experience losses in this
- * mode then missing picture will be black (no flickering).
- *
- * Finally, if user chooses not to clean the current frame before
- * filling it with data then the old data will be visible if we fail
- * to refill entire frame with new data.
- */
- if (!(uvd->flags & FLAGS_SEPARATE_FRAMES)) {
- /* This copies previous frame into this one to mask losses */
- memmove(frame->data, uvd->frame[1-framenum].data, uvd->max_frame_size);
- } else {
- if (uvd->flags & FLAGS_CLEAN_FRAMES) {
- /* This provides a "clean" frame but slows things down */
- memset(frame->data, 0, uvd->max_frame_size);
- }
- }
- return 0;
- }
- /*
- * usbvideo_CollectRawData()
- *
- * This procedure can be used instead of 'processData' callback if you
- * only want to dump the raw data from the camera into the output
- * device (frame buffer). You can look at it with V4L client, but the
- * image will be unwatchable. The main purpose of this code and of the
- * mode FLAGS_NO_DECODING is debugging and capturing of datastreams from
- * new, unknown cameras. This procedure will be automatically invoked
- * instead of the specified callback handler when uvd->flags has bit
- * FLAGS_NO_DECODING set. Therefore, any regular build of any driver
- * based on usbvideo can use this feature at any time.
- */
- void usbvideo_CollectRawData(uvd_t *uvd, usbvideo_frame_t *frame)
- {
- int n;
- assert(uvd != NULL);
- assert(frame != NULL);
- /* Try to move data from queue into frame buffer */
- n = RingQueue_GetLength(&uvd->dp);
- if (n > 0) {
- int m;
- /* See how much space we have left */
- m = uvd->max_frame_size - frame->seqRead_Length;
- if (n > m)
- n = m;
- /* Now move that much data into frame buffer */
- RingQueue_Dequeue(
- &uvd->dp,
- frame->data + frame->seqRead_Length,
- m);
- frame->seqRead_Length += m;
- }
- /* See if we filled the frame */
- if (frame->seqRead_Length >= uvd->max_frame_size) {
- frame->frameState = FrameState_Done;
- uvd->curframe = -1;
- uvd->stats.frame_num++;
- }
- }
- int usbvideo_GetFrame(uvd_t *uvd, int frameNum)
- {
- static const char proc[] = "usbvideo_GetFrame";
- usbvideo_frame_t *frame = &uvd->frame[frameNum];
- if (uvd->debug >= 2)
- info("%s($%p,%d.)", proc, uvd, frameNum);
- switch (frame->frameState) {
- case FrameState_Unused:
- if (uvd->debug >= 2)
- info("%s: FrameState_Unused", proc);
- return -EINVAL;
- case FrameState_Ready:
- case FrameState_Grabbing:
- case FrameState_Error:
- {
- int ntries, signalPending;
- redo:
- if (!CAMERA_IS_OPERATIONAL(uvd)) {
- if (uvd->debug >= 2)
- info("%s: Camera is not operational (1)", proc);
- return -EIO;
- }
- ntries = 0;
- do {
- RingQueue_InterruptibleSleepOn(&uvd->dp);
- signalPending = signal_pending(current);
- if (!CAMERA_IS_OPERATIONAL(uvd)) {
- if (uvd->debug >= 2)
- info("%s: Camera is not operational (2)", proc);
- return -EIO;
- }
- assert(uvd->fbuf != NULL);
- if (signalPending) {
- if (uvd->debug >= 2)
- info("%s: Signal=$%08x", proc, signalPending);
- if (uvd->flags & FLAGS_RETRY_VIDIOCSYNC) {
- usbvideo_TestPattern(uvd, 1, 0);
- uvd->curframe = -1;
- uvd->stats.frame_num++;
- if (uvd->debug >= 2)
- info("%s: Forced test pattern screen", proc);
- return 0;
- } else {
- /* Standard answer: Interrupted! */
- if (uvd->debug >= 2)
- info("%s: Interrupted!", proc);
- return -EINTR;
- }
- } else {
- /* No signals - we just got new data in dp queue */
- if (uvd->flags & FLAGS_NO_DECODING)
- usbvideo_CollectRawData(uvd, frame);
- else if (VALID_CALLBACK(uvd, processData))
- GET_CALLBACK(uvd, processData)(uvd, frame);
- else
- err("%s: processData not set", proc);
- }
- } while (frame->frameState == FrameState_Grabbing);
- if (uvd->debug >= 2) {
- info("%s: Grabbing done; state=%d. (%lu. bytes)",
- proc, frame->frameState, frame->seqRead_Length);
- }
- if (frame->frameState == FrameState_Error) {
- int ret = usbvideo_NewFrame(uvd, frameNum);
- if (ret < 0) {
- err("%s: usbvideo_NewFrame() failed (%d.)", proc, ret);
- return ret;
- }
- goto redo;
- }
- /* Note that we fall through to meet our destiny below */
- }
- case FrameState_Done:
- /*
- * Do all necessary postprocessing of data prepared in
- * "interrupt" code and the collecting code above. The
- * frame gets marked as FrameState_Done by queue parsing code.
- * This status means that we collected enough data and
- * most likely processed it as we went through. However
- * the data may need postprocessing, such as deinterlacing
- * or picture adjustments implemented in software (horror!)
- *
- * As soon as the frame becomes "final" it gets promoted to
- * FrameState_Done_Hold status where it will remain until the
- * caller consumed all the video data from the frame. Then
- * the empty shell of ex-frame is thrown out for dogs to eat.
- * But we, worried about pets, will recycle the frame!
- */
- uvd->stats.frame_num++;
- if ((uvd->flags & FLAGS_NO_DECODING) == 0) {
- if (VALID_CALLBACK(uvd, postProcess))
- GET_CALLBACK(uvd, postProcess)(uvd, frame);
- if (frame->flags & USBVIDEO_FRAME_FLAG_SOFTWARE_CONTRAST)
- usbvideo_SoftwareContrastAdjustment(uvd, frame);
- }
- frame->frameState = FrameState_Done_Hold;
- if (uvd->debug >= 2)
- info("%s: Entered FrameState_Done_Hold state.", proc);
- return 0;
- case FrameState_Done_Hold:
- /*
- * We stay in this state indefinitely until someone external,
- * like ioctl() or read() call finishes digesting the frame
- * data. Then it will mark the frame as FrameState_Unused and
- * it will be released back into the wild to roam freely.
- */
- if (uvd->debug >= 2)
- info("%s: FrameState_Done_Hold state.", proc);
- return 0;
- }
- /* Catch-all for other cases. We shall not be here. */
- err("%s: Invalid state %d.", proc, frame->frameState);
- frame->frameState = FrameState_Unused;
- return 0;
- }
- /*
- * usbvideo_DeinterlaceFrame()
- *
- * This procedure deinterlaces the given frame. Some cameras produce
- * only half of scanlines - sometimes only even lines, sometimes only
- * odd lines. The deinterlacing method is stored in frame->deinterlace
- * variable.
- *
- * Here we scan the frame vertically and replace missing scanlines with
- * average between surrounding ones - before and after. If we have no
- * line above then we just copy next line. Similarly, if we need to
- * create a last line then preceding line is used.
- */
- void usbvideo_DeinterlaceFrame(uvd_t *uvd, usbvideo_frame_t *frame)
- {
- if ((uvd == NULL) || (frame == NULL))
- return;
- if ((frame->deinterlace == Deinterlace_FillEvenLines) ||
- (frame->deinterlace == Deinterlace_FillOddLines))
- {
- const int v4l_linesize = VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL;
- int i = (frame->deinterlace == Deinterlace_FillEvenLines) ? 0 : 1;
- for (; i < VIDEOSIZE_Y(frame->request); i += 2) {
- const unsigned char *fs1, *fs2;
- unsigned char *fd;
- int ip, in, j; /* Previous and next lines */
- /*
- * Need to average lines before and after 'i'.
- * If we go out of bounds seeking those lines then
- * we point back to existing line.
- */
- ip = i - 1; /* First, get rough numbers */
- in = i + 1;
- /* Now validate */
- if (ip < 0)
- ip = in;
- if (in >= VIDEOSIZE_Y(frame->request))
- in = ip;
- /* Sanity check */
- if ((ip < 0) || (in < 0) ||
- (ip >= VIDEOSIZE_Y(frame->request)) ||
- (in >= VIDEOSIZE_Y(frame->request)))
- {
- err("Error: ip=%d. in=%d. req.height=%ld.",
- ip, in, VIDEOSIZE_Y(frame->request));
- break;
- }
- /* Now we need to average lines 'ip' and 'in' to produce line 'i' */
- fs1 = frame->data + (v4l_linesize * ip);
- fs2 = frame->data + (v4l_linesize * in);
- fd = frame->data + (v4l_linesize * i);
- /* Average lines around destination */
- for (j=0; j < v4l_linesize; j++) {
- fd[j] = (unsigned char)((((unsigned) fs1[j]) +
- ((unsigned)fs2[j])) >> 1);
- }
- }
- }
- /* Optionally display statistics on the screen */
- if (uvd->flags & FLAGS_OVERLAY_STATS)
- usbvideo_OverlayStats(uvd, frame);
- }
- /*
- * usbvideo_SoftwareContrastAdjustment()
- *
- * This code adjusts the contrast of the frame, assuming RGB24 format.
- * As most software image processing, this job is CPU-intensive.
- * Get a camera that supports hardware adjustment!
- *
- * History:
- * 09-Feb-2001 Created.
- */
- void usbvideo_SoftwareContrastAdjustment(uvd_t *uvd, usbvideo_frame_t *frame)
- {
- static const char proc[] = "usbvideo_SoftwareContrastAdjustment";
- int i, j, v4l_linesize;
- signed long adj;
- const int ccm = 128; /* Color correction median - see below */
- if ((uvd == NULL) || (frame == NULL)) {
- err("%s: Illegal call.", proc);
- return;
- }
- adj = (uvd->vpic.contrast - 0x8000) >> 8; /* -128..+127 = -ccm..+(ccm-1)*/
- RESTRICT_TO_RANGE(adj, -ccm, ccm+1);
- if (adj == 0) {
- /* In rare case of no adjustment */
- return;
- }
- v4l_linesize = VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL;
- for (i=0; i < VIDEOSIZE_Y(frame->request); i++) {
- unsigned char *fd = frame->data + (v4l_linesize * i);
- for (j=0; j < v4l_linesize; j++) {
- signed long v = (signed long) fd[j];
- /* Magnify up to 2 times, reduce down to zero */
- v = 128 + ((ccm + adj) * (v - 128)) / ccm;
- RESTRICT_TO_RANGE(v, 0, 0xFF); /* Must flatten tails */
- fd[j] = (unsigned char) v;
- }
- }
- }
- /*
- * /proc interface
- *
- * We will be creating directories and entries under /proc/video using
- * external 'video_proc_entry' directory which is exported by videodev.o
- * module. Within that directory we will create $driver/ directory to
- * uniquely and uniformly refer to our specific $driver. Within that
- * directory we will finally create an entry that is named after the
- * video device node - video3, for example. The format of that file
- * is determined by callbacks that the minidriver may provide. If no
- * callbacks are provided (neither read nor write) then we don't create
- * the entry.
- *
- * Here is a sample directory entry: /proc/video/ibmcam/video3
- *
- * The "file" video3 (in example above) is readable and writeable, in
- * theory. If the minidriver provides callbacks to do reading and
- * writing then both those procedures are supported. However if the
- * driver leaves callbacks in default (NULL) state the default
- * read and write handlers are used. The default read handler reports
- * that the driver does not support /proc fs. The default write handler
- * returns error code on any write attempt.
- */
- #if USES_PROC_FS
- extern struct proc_dir_entry *video_proc_entry;
- static void usbvideo_procfs_level1_create(usbvideo_t *ut)
- {
- static const char proc[] = "usbvideo_procfs_level1_create";
- if (ut == NULL) {
- err("%s: ut == NULL", proc);
- return;
- }
- if (video_proc_entry == NULL) {
- err("%s: /proc/video/ doesn't exist.", proc);
- return;
- }
- ut->procfs_dEntry = create_proc_entry(ut->drvName, S_IFDIR, video_proc_entry);
- if (ut->procfs_dEntry != NULL) {
- if (ut->md_module != NULL)
- ut->procfs_dEntry->owner = ut->md_module;
- } else {
- err("%s: Unable to initialize /proc/video/%s", proc, ut->drvName);
- }
- }
- static void usbvideo_procfs_level1_destroy(usbvideo_t *ut)
- {
- static const char proc[] = "usbvideo_procfs_level1_destroy";
- if (ut == NULL) {
- err("%s: ut == NULL", proc);
- return;
- }
- if (ut->procfs_dEntry != NULL) {
- remove_proc_entry(ut->drvName, video_proc_entry);
- ut->procfs_dEntry = NULL;
- }
- }
- static void usbvideo_procfs_level2_create(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_procfs_level2_create";
- if (uvd == NULL) {
- err("%s: uvd == NULL", proc);
- return;
- }
- assert(uvd->handle != NULL);
- if (uvd->handle->procfs_dEntry == NULL) {
- err("%s: uvd->handle->procfs_dEntry == NULL", proc);
- return;
- }
- sprintf(uvd->videoName, "video%d", uvd->vdev.minor);
- uvd->procfs_vEntry = create_proc_entry(
- uvd->videoName,
- S_IFREG | S_IRUGO | S_IWUSR,
- uvd->handle->procfs_dEntry);
- if (uvd->procfs_vEntry != NULL) {
- uvd->procfs_vEntry->data = uvd;
- uvd->procfs_vEntry->read_proc = uvd->handle->cb.procfs_read;
- uvd->procfs_vEntry->write_proc = uvd->handle->cb.procfs_write;
- } else {
- err("%s: Failed to create entry "%s"", proc, uvd->videoName);
- }
- }
- static void usbvideo_procfs_level2_destroy(uvd_t *uvd)
- {
- static const char proc[] = "usbvideo_procfs_level2_destroy";
- if (uvd == NULL) {
- err("%s: uvd == NULL", proc);
- return;
- }
- if (uvd->procfs_vEntry != NULL) {
- remove_proc_entry(uvd->videoName, uvd->procfs_vEntry);
- uvd->procfs_vEntry = NULL;
- }
- }
- static int usbvideo_default_procfs_read_proc(
- char *page, char **start, off_t off, int count,
- int *eof, void *data)
- {
- char *out = page;
- int len;
-
- /* Stay under PAGE_SIZE or else */
- out += sprintf(out, "This driver does not support /proc services.n");
- 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 usbvideo_default_procfs_write_proc(
- struct file *file, const char *buffer,
- unsigned long count, void *data)
- {
- return -EINVAL;
- }
- #endif /* USES_PROC_FS */
- MODULE_LICENSE("GPL");