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kernel-ark/drivers/usb/media/usbvideo.c
Jesper Juhl 1bc3c9e1e4 [PATCH] USB: kfree cleanup for drivers/usb/* - no need to check for NULL 
Get rid of a bunch of redundant NULL pointer checks in drivers/usb/*,
there's no need to check a pointer for NULL before calling kfree() on it.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


Index: gregkh-2.6/drivers/usb/class/audio.c
===================================================================
2005-04-18 17:39:34 -07:00

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/*
* 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++) {
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");
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