Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/usb/media/usbvideo.c b/drivers/usb/media/usbvideo.c
new file mode 100644
index 0000000..298484a
--- /dev/null
+++ b/drivers/usb/media/usbvideo.c
@@ -0,0 +1,2192 @@
+/*
+ * 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>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/vmalloc.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_param(video_nr, int, 0);
+
+/*
+ * Local prototypes.
+ */
+static void usbvideo_Disconnect(struct usb_interface *intf);
+static void usbvideo_CameraRelease(struct uvd *uvd);
+
+static int usbvideo_v4l_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg);
+static int usbvideo_v4l_mmap(struct file *file, struct vm_area_struct *vma);
+static int usbvideo_v4l_open(struct inode *inode, struct file *file);
+static ssize_t usbvideo_v4l_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos);
+static int usbvideo_v4l_close(struct inode *inode, struct file *file);
+
+static int usbvideo_StartDataPump(struct uvd *uvd);
+static void usbvideo_StopDataPump(struct uvd *uvd);
+static int usbvideo_GetFrame(struct uvd *uvd, int frameNum);
+static int usbvideo_NewFrame(struct uvd *uvd, int framenum);
+static void usbvideo_SoftwareContrastAdjustment(struct uvd *uvd,
+ struct usbvideo_frame *frame);
+
+/*******************************/
+/* Memory management functions */
+/*******************************/
+static 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) {
+ SetPageReserved(vmalloc_to_page((void *)adr));
+ adr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+
+ return mem;
+}
+
+static void usbvideo_rvfree(void *mem, unsigned long size)
+{
+ unsigned long adr;
+
+ if (!mem)
+ return;
+
+ adr = (unsigned long) mem;
+ while ((long) size > 0) {
+ ClearPageReserved(vmalloc_to_page((void *)adr));
+ adr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+ vfree(mem);
+}
+
+static void RingQueue_Initialize(struct RingQueue *rq)
+{
+ assert(rq != NULL);
+ init_waitqueue_head(&rq->wqh);
+}
+
+static void RingQueue_Allocate(struct RingQueue *rq, int rqLen)
+{
+ /* Make sure the requested size is a power of 2 and
+ round up if necessary. This allows index wrapping
+ using masks rather than modulo */
+
+ int i = 1;
+ assert(rq != NULL);
+ assert(rqLen > 0);
+
+ while(rqLen >> i)
+ i++;
+ if(rqLen != 1 << (i-1))
+ rqLen = 1 << i;
+
+ rq->length = rqLen;
+ rq->ri = rq->wi = 0;
+ rq->queue = usbvideo_rvmalloc(rq->length);
+ assert(rq->queue != NULL);
+}
+
+static int RingQueue_IsAllocated(const struct RingQueue *rq)
+{
+ if (rq == NULL)
+ return 0;
+ return (rq->queue != NULL) && (rq->length > 0);
+}
+
+static void RingQueue_Free(struct RingQueue *rq)
+{
+ assert(rq != NULL);
+ if (RingQueue_IsAllocated(rq)) {
+ usbvideo_rvfree(rq->queue, rq->length);
+ rq->queue = NULL;
+ rq->length = 0;
+ }
+}
+
+int RingQueue_Dequeue(struct RingQueue *rq, unsigned char *dst, int len)
+{
+ int rql, toread;
+
+ assert(rq != NULL);
+ assert(dst != NULL);
+
+ rql = RingQueue_GetLength(rq);
+ if(!rql)
+ return 0;
+
+ /* Clip requested length to available data */
+ if(len > rql)
+ len = rql;
+
+ toread = len;
+ if(rq->ri > rq->wi) {
+ /* Read data from tail */
+ int read = (toread < (rq->length - rq->ri)) ? toread : rq->length - rq->ri;
+ memcpy(dst, rq->queue + rq->ri, read);
+ toread -= read;
+ dst += read;
+ rq->ri = (rq->ri + read) & (rq->length-1);
+ }
+ if(toread) {
+ /* Read data from head */
+ memcpy(dst, rq->queue + rq->ri, toread);
+ rq->ri = (rq->ri + toread) & (rq->length-1);
+ }
+ return len;
+}
+
+EXPORT_SYMBOL(RingQueue_Dequeue);
+
+int RingQueue_Enqueue(struct RingQueue *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;
+
+ memcpy(rq->queue + rq->wi, cdata, m);
+ RING_QUEUE_ADVANCE_INDEX(rq, wi, m);
+ cdata += m;
+ enqueued += m;
+ n -= m;
+ }
+ return enqueued;
+}
+
+EXPORT_SYMBOL(RingQueue_Enqueue);
+
+static void RingQueue_InterruptibleSleepOn(struct RingQueue *rq)
+{
+ assert(rq != NULL);
+ interruptible_sleep_on(&rq->wqh);
+}
+
+void RingQueue_WakeUpInterruptible(struct RingQueue *rq)
+{
+ assert(rq != NULL);
+ if (waitqueue_active(&rq->wqh))
+ wake_up_interruptible(&rq->wqh);
+}
+
+EXPORT_SYMBOL(RingQueue_WakeUpInterruptible);
+
+void RingQueue_Flush(struct RingQueue *rq)
+{
+ assert(rq != NULL);
+ rq->ri = 0;
+ rq->wi = 0;
+}
+
+EXPORT_SYMBOL(RingQueue_Flush);
+
+
+/*
+ * usbvideo_VideosizeToString()
+ *
+ * This procedure converts given videosize value to readable string.
+ *
+ * History:
+ * 07-Aug-2000 Created.
+ * 19-Oct-2000 Reworked for usbvideo module.
+ */
+static 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.
+ */
+static void usbvideo_OverlayChar(struct uvd *uvd, struct usbvideo_frame *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.
+ */
+static void usbvideo_OverlayString(struct uvd *uvd, struct usbvideo_frame *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.
+ */
+static void usbvideo_OverlayStats(struct uvd *uvd, struct usbvideo_frame *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-1);
+ } 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.
+ */
+static void usbvideo_ReportStatistics(const struct uvd *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_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(struct uvd *uvd, int fullframe, int pmode)
+{
+ struct usbvideo_frame *frame;
+ int num_cell = 0;
+ int scan_length = 0;
+ static int num_pass = 0;
+
+ if (uvd == NULL) {
+ err("%s: uvd == NULL", __FUNCTION__);
+ return;
+ }
+ if ((uvd->curframe < 0) || (uvd->curframe >= USBVIDEO_NUMFRAMES)) {
+ err("%s: uvd->curframe=%d.", __FUNCTION__, 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);
+}
+
+EXPORT_SYMBOL(usbvideo_TestPattern);
+
+
+#ifdef DEBUG
+/*
+ * 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("%s\n", 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("%s\n", tmp);
+}
+
+EXPORT_SYMBOL(usbvideo_HexDump);
+
+#endif
+
+/* ******************************************************************** */
+
+/* XXX: this piece of crap really wants some error handling.. */
+static void usbvideo_ClientIncModCount(struct uvd *uvd)
+{
+ if (uvd == NULL) {
+ err("%s: uvd == NULL", __FUNCTION__);
+ return;
+ }
+ if (uvd->handle == NULL) {
+ err("%s: uvd->handle == NULL", __FUNCTION__);
+ return;
+ }
+ if (uvd->handle->md_module == NULL) {
+ err("%s: uvd->handle->md_module == NULL", __FUNCTION__);
+ return;
+ }
+ if (!try_module_get(uvd->handle->md_module)) {
+ err("%s: try_module_get() == 0", __FUNCTION__);
+ return;
+ }
+}
+
+static void usbvideo_ClientDecModCount(struct uvd *uvd)
+{
+ if (uvd == NULL) {
+ err("%s: uvd == NULL", __FUNCTION__);
+ return;
+ }
+ if (uvd->handle == NULL) {
+ err("%s: uvd->handle == NULL", __FUNCTION__);
+ return;
+ }
+ if (uvd->handle->md_module == NULL) {
+ err("%s: uvd->handle->md_module == NULL", __FUNCTION__);
+ return;
+ }
+ module_put(uvd->handle->md_module);
+}
+
+int usbvideo_register(
+ struct usbvideo **pCams,
+ const int num_cams,
+ const int num_extra,
+ const char *driverName,
+ const struct usbvideo_cb *cbTbl,
+ struct module *md,
+ const struct usb_device_id *id_table)
+{
+ struct usbvideo *cams;
+ int i, base_size, result;
+
+ /* Check parameters for sanity */
+ if ((num_cams <= 0) || (pCams == NULL) || (cbTbl == NULL)) {
+ err("%s: Illegal call", __FUNCTION__);
+ return -EINVAL;
+ }
+
+ /* Check registration callback - must be set! */
+ if (cbTbl->probe == NULL) {
+ err("%s: probe() is required!", __FUNCTION__);
+ return -EINVAL;
+ }
+
+ base_size = num_cams * sizeof(struct uvd) + sizeof(struct usbvideo);
+ cams = (struct usbvideo *) kmalloc(base_size, GFP_KERNEL);
+ if (cams == NULL) {
+ err("Failed to allocate %d. bytes for usbvideo struct", base_size);
+ return -ENOMEM;
+ }
+ dbg("%s: Allocated $%p (%d. bytes) for %d. cameras",
+ __FUNCTION__, cams, base_size, num_cams);
+ memset(cams, 0, base_size);
+
+ /* Copy callbacks, apply defaults for those that are not set */
+ memmove(&cams->cb, cbTbl, sizeof(cams->cb));
+ if (cams->cb.getFrame == NULL)
+ cams->cb.getFrame = usbvideo_GetFrame;
+ if (cams->cb.disconnect == NULL)
+ cams->cb.disconnect = usbvideo_Disconnect;
+ if (cams->cb.startDataPump == NULL)
+ cams->cb.startDataPump = usbvideo_StartDataPump;
+ if (cams->cb.stopDataPump == NULL)
+ cams->cb.stopDataPump = usbvideo_StopDataPump;
+
+ cams->num_cameras = num_cams;
+ cams->cam = (struct uvd *) &cams[1];
+ cams->md_module = md;
+ if (cams->md_module == NULL)
+ warn("%s: module == NULL!", __FUNCTION__);
+ init_MUTEX(&cams->lock); /* to 1 == available */
+
+ for (i = 0; i < num_cams; i++) {
+ struct uvd *up = &cams->cam[i];
+
+ up->handle = cams;
+
+ /* Allocate user_data separately because of kmalloc's limits */
+ if (num_extra > 0) {
+ up->user_size = num_cams * num_extra;
+ up->user_data = (char *) kmalloc(up->user_size, GFP_KERNEL);
+ if (up->user_data == NULL) {
+ err("%s: Failed to allocate user_data (%d. bytes)",
+ __FUNCTION__, up->user_size);
+ while (i) {
+ up = &cams->cam[--i];
+ kfree(up->user_data);
+ }
+ kfree(cams);
+ return -ENOMEM;
+ }
+ dbg("%s: Allocated cams[%d].user_data=$%p (%d. bytes)",
+ __FUNCTION__, 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;
+ cams->usbdrv.id_table = id_table;
+
+ /*
+ * 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;
+ result = usb_register(&cams->usbdrv);
+ if (result) {
+ for (i = 0; i < num_cams; i++) {
+ struct uvd *up = &cams->cam[i];
+ kfree(up->user_data);
+ }
+ kfree(cams);
+ }
+
+ return result;
+}
+
+EXPORT_SYMBOL(usbvideo_register);
+
+/*
+ * 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(struct usbvideo **pCams)
+{
+ struct usbvideo *cams;
+ int i;
+
+ if (pCams == NULL) {
+ err("%s: pCams == NULL", __FUNCTION__);
+ return;
+ }
+ cams = *pCams;
+ if (cams == NULL) {
+ err("%s: cams == NULL", __FUNCTION__);
+ return;
+ }
+
+ dbg("%s: Deregistering %s driver.", __FUNCTION__, cams->drvName);
+ usb_deregister(&cams->usbdrv);
+
+ dbg("%s: Deallocating cams=$%p (%d. cameras)", __FUNCTION__, cams, cams->num_cameras);
+ for (i=0; i < cams->num_cameras; i++) {
+ struct uvd *up = &cams->cam[i];
+ int warning = 0;
+
+ if (up->user_data != NULL) {
+ if (up->user_size <= 0)
+ ++warning;
+ } else {
+ if (up->user_size > 0)
+ ++warning;
+ }
+ if (warning) {
+ err("%s: Warning: user_data=$%p user_size=%d.",
+ __FUNCTION__, up->user_data, up->user_size);
+ } else {
+ dbg("%s: Freeing %d. $%p->user_data=$%p",
+ __FUNCTION__, i, up, up->user_data);
+ kfree(up->user_data);
+ }
+ }
+ /* Whole array was allocated in one chunk */
+ dbg("%s: Freed %d uvd structures",
+ __FUNCTION__, cams->num_cameras);
+ kfree(cams);
+ *pCams = NULL;
+}
+
+EXPORT_SYMBOL(usbvideo_Deregister);
+
+/*
+ * 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.
+ */
+static void usbvideo_Disconnect(struct usb_interface *intf)
+{
+ struct uvd *uvd = usb_get_intfdata (intf);
+ int i;
+
+ if (uvd == NULL) {
+ err("%s($%p): Illegal call.", __FUNCTION__, intf);
+ return;
+ }
+
+ usb_set_intfdata (intf, NULL);
+
+ usbvideo_ClientIncModCount(uvd);
+ if (uvd->debug > 0)
+ info("%s(%p.)", __FUNCTION__, intf);
+
+ down(&uvd->lock);
+ uvd->remove_pending = 1; /* Now all ISO data will be ignored */
+
+ /* At this time we ask to cancel outstanding URBs */
+ GET_CALLBACK(uvd, stopDataPump)(uvd);
+
+ for (i=0; i < USBVIDEO_NUMSBUF; i++)
+ usb_free_urb(uvd->sbuf[i].urb);
+
+ usb_put_dev(uvd->dev);
+ uvd->dev = NULL; /* USB device is no more */
+
+ video_unregister_device(&uvd->vdev);
+ if (uvd->debug > 0)
+ info("%s: Video unregistered.", __FUNCTION__);
+
+ if (uvd->user)
+ info("%s: In use, disconnect pending.", __FUNCTION__);
+ else
+ usbvideo_CameraRelease(uvd);
+ up(&uvd->lock);
+ info("USB camera disconnected.");
+
+ usbvideo_ClientDecModCount(uvd);
+}
+
+/*
+ * usbvideo_CameraRelease()
+ *
+ * This code does final release of uvd. This happens
+ * after the device is disconnected -and- all clients
+ * closed their files.
+ *
+ * History:
+ * 27-Jan-2000 Created.
+ */
+static void usbvideo_CameraRelease(struct uvd *uvd)
+{
+ if (uvd == NULL) {
+ err("%s: Illegal call", __FUNCTION__);
+ return;
+ }
+
+ 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(struct usbvideo *cams)
+{
+ int u, rv = -1;
+
+ if (cams == NULL) {
+ err("No usbvideo handle?");
+ return -1;
+ }
+ down(&cams->lock);
+ for (u = 0; u < cams->num_cameras; u++) {
+ struct uvd *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;
+}
+
+static struct file_operations usbvideo_fops = {
+ .owner = THIS_MODULE,
+ .open = usbvideo_v4l_open,
+ .release =usbvideo_v4l_close,
+ .read = usbvideo_v4l_read,
+ .mmap = usbvideo_v4l_mmap,
+ .ioctl = usbvideo_v4l_ioctl,
+ .llseek = no_llseek,
+};
+static struct video_device usbvideo_template = {
+ .owner = THIS_MODULE,
+ .type = VID_TYPE_CAPTURE,
+ .hardware = VID_HARDWARE_CPIA,
+ .fops = &usbvideo_fops,
+};
+
+struct uvd *usbvideo_AllocateDevice(struct usbvideo *cams)
+{
+ int i, devnum;
+ struct uvd *uvd = NULL;
+
+ if (cams == NULL) {
+ err("No usbvideo 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 $%p", devnum, uvd);
+
+ /* Not relying upon caller we increase module counter ourselves */
+ usbvideo_ClientIncModCount(uvd);
+
+ down(&uvd->lock);
+ for (i=0; i < USBVIDEO_NUMSBUF; i++) {
+ uvd->sbuf[i].urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
+ if (uvd->sbuf[i].urb == NULL) {
+ err("usb_alloc_urb(%d.) failed.", FRAMES_PER_DESC);
+ uvd->uvd_used = 0;
+ uvd = NULL;
+ goto allocate_done;
+ }
+ }
+ uvd->user=0;
+ uvd->remove_pending = 0;
+ uvd->last_error = 0;
+ RingQueue_Initialize(&uvd->dp);
+
+ /* Initialize video device structure */
+ uvd->vdev = usbvideo_template;
+ sprintf(uvd->vdev.name, "%.20s USB Camera", cams->drvName);
+ /*
+ * The client is free to overwrite those because we
+ * return control to the client's probe function right now.
+ */
+allocate_done:
+ up (&uvd->lock);
+ usbvideo_ClientDecModCount(uvd);
+ return uvd;
+}
+
+EXPORT_SYMBOL(usbvideo_AllocateDevice);
+
+int usbvideo_RegisterVideoDevice(struct uvd *uvd)
+{
+ char tmp1[20], tmp2[20]; /* Buffers for printing */
+
+ if (uvd == NULL) {
+ err("%s: Illegal call.", __FUNCTION__);
+ return -EINVAL;
+ }
+ if (uvd->video_endp == 0) {
+ info("%s: No video endpoint specified; data pump disabled.", __FUNCTION__);
+ }
+ if (uvd->paletteBits == 0) {
+ err("%s: No palettes specified!", __FUNCTION__);
+ return -EINVAL;
+ }
+ if (uvd->defaultPalette == 0) {
+ info("%s: No default palette!", __FUNCTION__);
+ }
+
+ uvd->max_frame_size = VIDEOSIZE_X(uvd->canvas) *
+ VIDEOSIZE_Y(uvd->canvas) * V4L_BYTES_PER_PIXEL;
+ usbvideo_VideosizeToString(tmp1, sizeof(tmp1), uvd->videosize);
+ usbvideo_VideosizeToString(tmp2, sizeof(tmp2), uvd->canvas);
+
+ if (uvd->debug > 0) {
+ info("%s: iface=%d. endpoint=$%02x paletteBits=$%08lx",
+ __FUNCTION__, 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", __FUNCTION__);
+ return -EPIPE;
+ }
+ if (uvd->debug > 1) {
+ info("%s: video_register_device() successful", __FUNCTION__);
+ }
+ if (uvd->dev == NULL) {
+ err("%s: uvd->dev == NULL", __FUNCTION__);
+ return -EINVAL;
+ }
+
+ info("%s on /dev/video%d: canvas=%s videosize=%s",
+ (uvd->handle != NULL) ? uvd->handle->drvName : "???",
+ uvd->vdev.minor, tmp2, tmp1);
+
+ usb_get_dev(uvd->dev);
+ return 0;
+}
+
+EXPORT_SYMBOL(usbvideo_RegisterVideoDevice);
+
+/* ******************************************************************** */
+
+static int usbvideo_v4l_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct uvd *uvd = file->private_data;
+ unsigned long start = vma->vm_start;
+ unsigned long size = vma->vm_end-vma->vm_start;
+ unsigned long page, pos;
+
+ if (!CAMERA_IS_OPERATIONAL(uvd))
+ return -EFAULT;
+
+ if (size > (((USBVIDEO_NUMFRAMES * uvd->max_frame_size) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)))
+ return -EINVAL;
+
+ pos = (unsigned long) uvd->fbuf;
+ while (size > 0) {
+ page = vmalloc_to_pfn((void *)pos);
+ if (remap_pfn_range(vma, 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).
+ */
+static int usbvideo_v4l_open(struct inode *inode, struct file *file)
+{
+ struct video_device *dev = video_devdata(file);
+ struct uvd *uvd = (struct uvd *) dev;
+ const int sb_size = FRAMES_PER_DESC * uvd->iso_packet_len;
+ int i, errCode = 0;
+
+ if (uvd->debug > 1)
+ info("%s($%p)", __FUNCTION__, dev);
+
+ usbvideo_ClientIncModCount(uvd);
+ down(&uvd->lock);
+
+ if (uvd->user) {
+ err("%s: Someone tried to open an already opened device!", __FUNCTION__);
+ 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, RING_QUEUE_SIZE);
+ if ((uvd->fbuf == NULL) ||
+ (!RingQueue_IsAllocated(&uvd->dp))) {
+ err("%s: Failed to allocate fbuf or dp", __FUNCTION__);
+ 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 = GET_CALLBACK(uvd, startDataPump)(uvd);
+ if (errCode == 0) {
+ if (VALID_CALLBACK(uvd, setupOnOpen)) {
+ if (uvd->debug > 1)
+ info("%s: setupOnOpen callback", __FUNCTION__);
+ errCode = GET_CALLBACK(uvd, setupOnOpen)(uvd);
+ if (errCode < 0) {
+ err("%s: setupOnOpen callback failed (%d.).",
+ __FUNCTION__, errCode);
+ } else if (uvd->debug > 1) {
+ info("%s: setupOnOpen callback successful", __FUNCTION__);
+ }
+ }
+ if (errCode == 0) {
+ uvd->settingsAdjusted = 0;
+ if (uvd->debug > 1)
+ info("%s: Open succeeded.", __FUNCTION__);
+ uvd->user++;
+ file->private_data = uvd;
+ }
+ }
+ }
+ up(&uvd->lock);
+ if (errCode != 0)
+ usbvideo_ClientDecModCount(uvd);
+ if (uvd->debug > 0)
+ info("%s: Returning %d.", __FUNCTION__, 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.
+ */
+static int usbvideo_v4l_close(struct inode *inode, struct file *file)
+{
+ struct video_device *dev = file->private_data;
+ struct uvd *uvd = (struct uvd *) dev;
+ int i;
+
+ if (uvd->debug > 1)
+ info("%s($%p)", __FUNCTION__, dev);
+
+ down(&uvd->lock);
+ GET_CALLBACK(uvd, 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.", __FUNCTION__);
+ file->private_data = NULL;
+ return 0;
+}
+
+/*
+ * 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.
+ */
+static int usbvideo_v4l_do_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, void *arg)
+{
+ struct uvd *uvd = file->private_data;
+
+ if (!CAMERA_IS_OPERATIONAL(uvd))
+ return -EIO;
+
+ switch (cmd) {
+ case VIDIOCGCAP:
+ {
+ struct video_capability *b = arg;
+ *b = uvd->vcap;
+ return 0;
+ }
+ case VIDIOCGCHAN:
+ {
+ struct video_channel *v = arg;
+ *v = uvd->vchan;
+ return 0;
+ }
+ case VIDIOCSCHAN:
+ {
+ struct video_channel *v = arg;
+ if (v->channel != 0)
+ return -EINVAL;
+ return 0;
+ }
+ case VIDIOCGPICT:
+ {
+ struct video_picture *pic = arg;
+ *pic = uvd->vpic;
+ return 0;
+ }
+ case VIDIOCSPICT:
+ {
+ struct video_picture *pic = arg;
+ /*
+ * 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.
+ */
+ uvd->vpic.brightness = pic->brightness;
+ uvd->vpic.hue = pic->hue;
+ uvd->vpic.colour = pic->colour;
+ uvd->vpic.contrast = pic->contrast;
+ uvd->settingsAdjusted = 0; /* Will force new settings */
+ return 0;
+ }
+ case VIDIOCSWIN:
+ {
+ struct video_window *vw = arg;
+
+ if(VALID_CALLBACK(uvd, setVideoMode)) {
+ return GET_CALLBACK(uvd, setVideoMode)(uvd, vw);
+ }
+
+ 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 = arg;
+
+ vw->x = 0;
+ vw->y = 0;
+ vw->width = VIDEOSIZE_X(uvd->videosize);
+ vw->height = VIDEOSIZE_Y(uvd->videosize);
+ vw->chromakey = 0;
+ if (VALID_CALLBACK(uvd, getFPS))
+ vw->flags = GET_CALLBACK(uvd, getFPS)(uvd);
+ else
+ vw->flags = 10; /* FIXME: do better! */
+ return 0;
+ }
+ case VIDIOCGMBUF:
+ {
+ struct video_mbuf *vm = arg;
+ int i;
+
+ memset(vm, 0, sizeof(*vm));
+ vm->size = uvd->max_frame_size * USBVIDEO_NUMFRAMES;
+ vm->frames = USBVIDEO_NUMFRAMES;
+ for(i = 0; i < USBVIDEO_NUMFRAMES; i++)
+ vm->offsets[i] = i * uvd->max_frame_size;
+
+ return 0;
+ }
+ case VIDIOCMCAPTURE:
+ {
+ struct video_mmap *vm = arg;
+
+ 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 >= USBVIDEO_NUMFRAMES)) {
+ err("VIDIOCMCAPTURE: vm.frame=%d. !E [0-%d]", vm->frame, USBVIDEO_NUMFRAMES-1);
+ 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 = arg;
+ int ret;
+
+ 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 = arg;
+
+ memset(vb, 0, sizeof(*vb));
+ 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;
+}
+
+static int usbvideo_v4l_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return video_usercopy(inode, file, cmd, arg, usbvideo_v4l_do_ioctl);
+}
+
+/*
+ * 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).
+ */
+static ssize_t usbvideo_v4l_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct uvd *uvd = file->private_data;
+ int noblock = file->f_flags & O_NONBLOCK;
+ int frmx = -1, i;
+ struct usbvideo_frame *frame;
+
+ if (!CAMERA_IS_OPERATIONAL(uvd) || (buf == NULL))
+ return -EFAULT;
+
+ if (uvd->debug >= 1)
+ info("%s: %Zd. bytes, noblock=%d.", __FUNCTION__, count, noblock);
+
+ down(&uvd->lock);
+
+ /* See if a frame is completed, then use it. */
+ for(i = 0; i < USBVIDEO_NUMFRAMES; i++) {
+ if ((uvd->frame[i].frameState == FrameState_Done) ||
+ (uvd->frame[i].frameState == FrameState_Done_Hold) ||
+ (uvd->frame[i].frameState == FrameState_Error)) {
+ frmx = i;
+ break;
+ }
+ }
+
+ /* 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) {
+ for(i = 0; i < USBVIDEO_NUMFRAMES; i++) {
+ if (uvd->frame[i].frameState == FrameState_Grabbing) {
+ frmx = i;
+ break;
+ }
+ }
+ }
+
+ /*
+ * 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!", __FUNCTION__);
+ 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) > 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=%Zd, new seqRead_Index=%ld",
+ __FUNCTION__, 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 + 1) % USBVIDEO_NUMFRAMES)) {
+ err("%s: usbvideo_NewFrame failed.", __FUNCTION__);
+ }
+ }
+read_done:
+ up(&uvd->lock);
+ return count;
+}
+
+/*
+ * Make all of the blocks of data contiguous
+ */
+static int usbvideo_CompressIsochronous(struct uvd *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, struct pt_regs *regs)
+{
+ int i, ret, len;
+ struct uvd *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=$%p status=%d. errcount=%d. length=%d.",
+ urb, urb->status, urb->error_count, urb->actual_length);
+ } else {
+ static int c = 0;
+ if (c++ % 100 == 0)
+ info("No Isoc data");
+ }
+#endif
+
+ if (!uvd->streaming) {
+ if (uvd->debug >= 1)
+ info("Not streaming, but interrupt!");
+ return;
+ }
+
+ uvd->stats.urb_count++;
+ if (urb->actual_length <= 0)
+ goto urb_done_with;
+
+ /* Copy the data received into ring queue */
+ len = usbvideo_CompressIsochronous(uvd, urb);
+ uvd->stats.urb_length = len;
+ if (len <= 0)
+ goto urb_done_with;
+
+ /* Here we got some data */
+ uvd->stats.data_count += len;
+ RingQueue_WakeUpInterruptible(&uvd->dp);
+
+urb_done_with:
+ for (i = 0; i < FRAMES_PER_DESC; i++) {
+ urb->iso_frame_desc[i].status = 0;
+ urb->iso_frame_desc[i].actual_length = 0;
+ }
+ urb->status = 0;
+ urb->dev = uvd->dev;
+ ret = usb_submit_urb (urb, GFP_KERNEL);
+ if(ret)
+ err("usb_submit_urb error (%d)", ret);
+ return;
+}
+
+/*
+ * usbvideo_StartDataPump()
+ *
+ * History:
+ * 27-Jan-2000 Used ibmcam->iface, ibmcam->ifaceAltActive instead
+ * of hardcoded values. Simplified by using for loop,
+ * allowed any number of URBs.
+ */
+static int usbvideo_StartDataPump(struct uvd *uvd)
+{
+ struct usb_device *dev = uvd->dev;
+ int i, errFlag;
+
+ if (uvd->debug > 1)
+ info("%s($%p)", __FUNCTION__, uvd);
+
+ if (!CAMERA_IS_OPERATIONAL(uvd)) {
+ err("%s: Camera is not operational", __FUNCTION__);
+ 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", __FUNCTION__);
+ uvd->last_error = i;
+ return -EBUSY;
+ }
+ if (VALID_CALLBACK(uvd, videoStart))
+ GET_CALLBACK(uvd, videoStart)(uvd);
+ else
+ err("%s: videoStart not set", __FUNCTION__);
+
+ /* 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->interval = 1;
+ urb->transfer_flags = URB_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;
+ }
+ }
+
+ /* Submit all URBs */
+ for (i=0; i < USBVIDEO_NUMSBUF; i++) {
+ errFlag = usb_submit_urb(uvd->sbuf[i].urb, GFP_KERNEL);
+ if (errFlag)
+ err("%s: usb_submit_isoc(%d) ret %d", __FUNCTION__, i, errFlag);
+ }
+
+ uvd->streaming = 1;
+ if (uvd->debug > 1)
+ info("%s: streaming=1 video_endp=$%02x", __FUNCTION__, uvd->video_endp);
+ return 0;
+}
+
+/*
+ * usbvideo_StopDataPump()
+ *
+ * This procedure stops streaming and deallocates URBs. Then it
+ * activates zero-bandwidth alt. setting of the video interface.
+ *
+ * History:
+ * 22-Jan-2000 Corrected order of actions to work after surprise removal.
+ * 27-Jan-2000 Used uvd->iface, uvd->ifaceAltInactive instead of hardcoded values.
+ */
+static void usbvideo_StopDataPump(struct uvd *uvd)
+{
+ int i, j;
+
+ if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
+ return;
+
+ if (uvd->debug > 1)
+ info("%s($%p)", __FUNCTION__, uvd);
+
+ /* Unschedule all of the iso td's */
+ for (i=0; i < USBVIDEO_NUMSBUF; i++) {
+ usb_kill_urb(uvd->sbuf[i].urb);
+ }
+ if (uvd->debug > 1)
+ info("%s: streaming=0", __FUNCTION__);
+ 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", __FUNCTION__);
+
+ /* 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.", __FUNCTION__, 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.
+ */
+static int usbvideo_NewFrame(struct uvd *uvd, int framenum)
+{
+ struct usbvideo_frame *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;
+ 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 */
+ int prev = (framenum - 1 + USBVIDEO_NUMFRAMES) % USBVIDEO_NUMFRAMES;
+ memmove(frame->data, uvd->frame[prev].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.
+ */
+static void usbvideo_CollectRawData(struct uvd *uvd, struct usbvideo_frame *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++;
+ }
+}
+
+static int usbvideo_GetFrame(struct uvd *uvd, int frameNum)
+{
+ struct usbvideo_frame *frame = &uvd->frame[frameNum];
+
+ if (uvd->debug >= 2)
+ info("%s($%p,%d.)", __FUNCTION__, uvd, frameNum);
+
+ switch (frame->frameState) {
+ case FrameState_Unused:
+ if (uvd->debug >= 2)
+ info("%s: FrameState_Unused", __FUNCTION__);
+ 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)", __FUNCTION__);
+ 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)", __FUNCTION__);
+ return -EIO;
+ }
+ assert(uvd->fbuf != NULL);
+ if (signalPending) {
+ if (uvd->debug >= 2)
+ info("%s: Signal=$%08x", __FUNCTION__, 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", __FUNCTION__);
+ return 0;
+ } else {
+ /* Standard answer: Interrupted! */
+ if (uvd->debug >= 2)
+ info("%s: Interrupted!", __FUNCTION__);
+ 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", __FUNCTION__);
+ }
+ } while (frame->frameState == FrameState_Grabbing);
+ if (uvd->debug >= 2) {
+ info("%s: Grabbing done; state=%d. (%lu. bytes)",
+ __FUNCTION__, 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.)", __FUNCTION__, 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.", __FUNCTION__);
+ 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.", __FUNCTION__);
+ return 0;
+ }
+
+ /* Catch-all for other cases. We shall not be here. */
+ err("%s: Invalid state %d.", __FUNCTION__, 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(struct uvd *uvd, struct usbvideo_frame *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);
+}
+
+EXPORT_SYMBOL(usbvideo_DeinterlaceFrame);
+
+/*
+ * 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.
+ */
+static void usbvideo_SoftwareContrastAdjustment(struct uvd *uvd,
+ struct usbvideo_frame *frame)
+{
+ 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.", __FUNCTION__);
+ 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;
+ }
+ }
+}
+
+MODULE_LICENSE("GPL");