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linux-next/drivers/media/video/vivi.c
Mauro Carvalho Chehab 0b60051286 V4L/DVB (5074): Some fixes at stream waitqueue on vivi 
There are several potential troubles on vivi waitqueue code:
- Watchdog timer should be reset at every received frame;
- Watchdog timer should be reset at the beginning of vivi_thread();
- Checks for errors when creating a newer thread with kernel_thread();
- Wake up vivi_thread() after creating it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2007-02-21 13:34:21 -02:00

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/*
* Virtual Video driver - This code emulates a real video device with v4l2 api
*
* Copyright (c) 2006 by:
* Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
* Ted Walther <ted--a.t--enumera.com>
* John Sokol <sokol--a.t--videotechnology.com>
* http://v4l.videotechnology.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the BSD Licence, GNU General Public License
* as published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/random.h>
#include <linux/version.h>
#include <linux/videodev2.h>
#include <linux/dma-mapping.h>
#ifdef CONFIG_VIDEO_V4L1_COMPAT
/* Include V4L1 specific functions. Should be removed soon */
#include <linux/videodev.h>
#endif
#include <linux/interrupt.h>
#include <media/video-buf.h>
#include <media/v4l2-common.h>
#include <linux/kthread.h>
#include <linux/highmem.h>
#include <linux/freezer.h>
/* Wake up at about 30 fps */
#define WAKE_NUMERATOR 30
#define WAKE_DENOMINATOR 1001
#define BUFFER_TIMEOUT msecs_to_jiffies(500) /* 0.5 seconds */
/* These timers are for 1 fps - used only for testing */
//#define WAKE_DENOMINATOR 30 /* hack for testing purposes */
//#define BUFFER_TIMEOUT msecs_to_jiffies(5000) /* 5 seconds */
#include "font.h"
#define VIVI_MAJOR_VERSION 0
#define VIVI_MINOR_VERSION 4
#define VIVI_RELEASE 0
#define VIVI_VERSION KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
/* Declare static vars that will be used as parameters */
static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
static struct video_device vivi; /* Video device */
static int video_nr = -1; /* /dev/videoN, -1 for autodetect */
/* supported controls */
static struct v4l2_queryctrl vivi_qctrl[] = {
{
.id = V4L2_CID_AUDIO_VOLUME,
.name = "Volume",
.minimum = 0,
.maximum = 65535,
.step = 65535/100,
.default_value = 65535,
.flags = 0,
.type = V4L2_CTRL_TYPE_INTEGER,
},{
.id = V4L2_CID_BRIGHTNESS,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Brightness",
.minimum = 0,
.maximum = 255,
.step = 1,
.default_value = 127,
.flags = 0,
}, {
.id = V4L2_CID_CONTRAST,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Contrast",
.minimum = 0,
.maximum = 255,
.step = 0x1,
.default_value = 0x10,
.flags = 0,
}, {
.id = V4L2_CID_SATURATION,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Saturation",
.minimum = 0,
.maximum = 255,
.step = 0x1,
.default_value = 127,
.flags = 0,
}, {
.id = V4L2_CID_HUE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Hue",
.minimum = -128,
.maximum = 127,
.step = 0x1,
.default_value = 0,
.flags = 0,
}
};
static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
#define dprintk(level,fmt, arg...) \
do { \
if (vivi.debug >= (level)) \
printk(KERN_DEBUG "vivi: " fmt , ## arg); \
} while (0)
/* ------------------------------------------------------------------
Basic structures
------------------------------------------------------------------*/
struct vivi_fmt {
char *name;
u32 fourcc; /* v4l2 format id */
int depth;
};
static struct vivi_fmt format = {
.name = "4:2:2, packed, YUYV",
.fourcc = V4L2_PIX_FMT_YUYV,
.depth = 16,
};
struct sg_to_addr {
int pos;
struct scatterlist *sg;
};
/* buffer for one video frame */
struct vivi_buffer {
/* common v4l buffer stuff -- must be first */
struct videobuf_buffer vb;
struct vivi_fmt *fmt;
struct sg_to_addr *to_addr;
};
struct vivi_dmaqueue {
struct list_head active;
struct list_head queued;
struct timer_list timeout;
/* thread for generating video stream*/
struct task_struct *kthread;
wait_queue_head_t wq;
/* Counters to control fps rate */
int frame;
int ini_jiffies;
};
static LIST_HEAD(vivi_devlist);
struct vivi_dev {
struct list_head vivi_devlist;
struct semaphore lock;
int users;
/* various device info */
unsigned int resources;
struct video_device vfd;
struct vivi_dmaqueue vidq;
/* Several counters */
int h,m,s,us,jiffies;
char timestr[13];
};
struct vivi_fh {
struct vivi_dev *dev;
/* video capture */
struct vivi_fmt *fmt;
unsigned int width,height;
struct videobuf_queue vb_vidq;
enum v4l2_buf_type type;
};
/* ------------------------------------------------------------------
DMA and thread functions
------------------------------------------------------------------*/
/* Bars and Colors should match positions */
enum colors {
WHITE,
AMBAR,
CYAN,
GREEN,
MAGENTA,
RED,
BLUE
};
static u8 bars[8][3] = {
/* R G B */
{204,204,204}, /* white */
{208,208, 0}, /* ambar */
{ 0,206,206}, /* cyan */
{ 0,239, 0}, /* green */
{239, 0,239}, /* magenta */
{205, 0, 0}, /* red */
{ 0, 0,255}, /* blue */
{ 0, 0, 0}
};
#define TO_Y(r,g,b) (((16829*r +33039*g +6416*b + 32768)>>16)+16)
/* RGB to V(Cr) Color transform */
#define TO_V(r,g,b) (((28784*r -24103*g -4681*b + 32768)>>16)+128)
/* RGB to U(Cb) Color transform */
#define TO_U(r,g,b) (((-9714*r -19070*g +28784*b + 32768)>>16)+128)
#define TSTAMP_MIN_Y 24
#define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
#define TSTAMP_MIN_X 64
static void prep_to_addr(struct sg_to_addr to_addr[],
struct videobuf_buffer *vb)
{
int i, pos=0;
for (i=0;i<vb->dma.nr_pages;i++) {
to_addr[i].sg=&vb->dma.sglist[i];
to_addr[i].pos=pos;
pos += vb->dma.sglist[i].length;
}
}
static int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
{
int p1=0,p2=pages-1,p3=pages/2;
/* Sanity test */
BUG_ON (pos>=to_addr[p2].pos+to_addr[p2].sg->length);
while (p1+1<p2) {
if (pos < to_addr[p3].pos) {
p2=p3;
} else {
p1=p3;
}
p3=(p1+p2)/2;
}
if (pos >= to_addr[p2].pos)
p1=p2;
return (p1);
}
static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
int hmax, int line, char *timestr)
{
int w,i,j,pos=inipos,pgpos,oldpg,y;
char *p,*s,*basep;
struct page *pg;
u8 chr,r,g,b,color;
unsigned long flags;
spinlock_t spinlock;
spin_lock_init(&spinlock);
/* Get first addr pointed to pixel position */
oldpg=get_addr_pos(pos,pages,to_addr);
pg=pfn_to_page(sg_dma_address(to_addr[oldpg].sg) >> PAGE_SHIFT);
spin_lock_irqsave(&spinlock,flags);
basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
/* We will just duplicate the second pixel at the packet */
wmax/=2;
/* Generate a standard color bar pattern */
for (w=0;w<wmax;w++) {
r=bars[w*7/wmax][0];
g=bars[w*7/wmax][1];
b=bars[w*7/wmax][2];
for (color=0;color<4;color++) {
pgpos=get_addr_pos(pos,pages,to_addr);
if (pgpos!=oldpg) {
pg=pfn_to_page(sg_dma_address(to_addr[pgpos].sg) >> PAGE_SHIFT);
kunmap_atomic(basep, KM_BOUNCE_READ);
basep= kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[pgpos].sg->offset;
oldpg=pgpos;
}
p=basep+pos-to_addr[pgpos].pos;
switch (color) {
case 0:
case 2:
*p=TO_Y(r,g,b); /* Luminance */
break;
case 1:
*p=TO_U(r,g,b); /* Cb */
break;
case 3:
*p=TO_V(r,g,b); /* Cr */
break;
}
pos++;
}
}
/* Checks if it is possible to show timestamp */
if (TSTAMP_MAX_Y>=hmax)
goto end;
if (TSTAMP_MIN_X+strlen(timestr)>=wmax)
goto end;
/* Print stream time */
if (line>=TSTAMP_MIN_Y && line<=TSTAMP_MAX_Y) {
j=TSTAMP_MIN_X;
for (s=timestr;*s;s++) {
chr=rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
for (i=0;i<7;i++) {
if (chr&1<<(7-i)) { /* Font color*/
r=bars[BLUE][0];
g=bars[BLUE][1];
b=bars[BLUE][2];
r=g=b=0;
g=198;
} else { /* Background color */
r=bars[WHITE][0];
g=bars[WHITE][1];
b=bars[WHITE][2];
r=g=b=0;
}
pos=inipos+j*2;
for (color=0;color<4;color++) {
pgpos=get_addr_pos(pos,pages,to_addr);
if (pgpos!=oldpg) {
pg=pfn_to_page(sg_dma_address(
to_addr[pgpos].sg)
>> PAGE_SHIFT);
kunmap_atomic(basep,
KM_BOUNCE_READ);
basep= kmap_atomic(pg,
KM_BOUNCE_READ)+
to_addr[pgpos].sg->offset;
oldpg=pgpos;
}
p=basep+pos-to_addr[pgpos].pos;
y=TO_Y(r,g,b);
switch (color) {
case 0:
case 2:
*p=TO_Y(r,g,b); /* Luminance */
break;
case 1:
*p=TO_U(r,g,b); /* Cb */
break;
case 3:
*p=TO_V(r,g,b); /* Cr */
break;
}
pos++;
}
j++;
}
}
}
end:
kunmap_atomic(basep, KM_BOUNCE_READ);
spin_unlock_irqrestore(&spinlock,flags);
}
static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
{
int h,pos=0;
int hmax = buf->vb.height;
int wmax = buf->vb.width;
struct videobuf_buffer *vb=&buf->vb;
struct sg_to_addr *to_addr=buf->to_addr;
struct timeval ts;
/* Test if DMA mapping is ready */
if (!sg_dma_address(&vb->dma.sglist[0]))
return;
prep_to_addr(to_addr,vb);
/* Check if there is enough memory */
BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
for (h=0;h<hmax;h++) {
gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
pos += wmax*2;
}
/* Updates stream time */
dev->us+=jiffies_to_usecs(jiffies-dev->jiffies);
dev->jiffies=jiffies;
if (dev->us>=1000000) {
dev->us-=1000000;
dev->s++;
if (dev->s>=60) {
dev->s-=60;
dev->m++;
if (dev->m>60) {
dev->m-=60;
dev->h++;
if (dev->h>24)
dev->h-=24;
}
}
}
sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
dev->h,dev->m,dev->s,(dev->us+500)/1000);
dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
(unsigned long)buf->vb.dma.vmalloc,pos);
/* Advice that buffer was filled */
buf->vb.state = STATE_DONE;
buf->vb.field_count++;
do_gettimeofday(&ts);
buf->vb.ts = ts;
list_del(&buf->vb.queue);
wake_up(&buf->vb.done);
}
static int restart_video_queue(struct vivi_dmaqueue *dma_q);
static void vivi_thread_tick(struct vivi_dmaqueue *dma_q)
{
struct vivi_buffer *buf;
struct vivi_dev *dev= container_of(dma_q,struct vivi_dev,vidq);
int bc;
/* Announces videobuf that all went ok */
for (bc = 0;; bc++) {
if (list_empty(&dma_q->active)) {
dprintk(1,"No active queue to serve\n");
break;
}
buf = list_entry(dma_q->active.next,
struct vivi_buffer, vb.queue);
/* Nobody is waiting something to be done, just return */
if (!waitqueue_active(&buf->vb.done)) {
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
return;
}
do_gettimeofday(&buf->vb.ts);
dprintk(2,"[%p/%d] wakeup\n",buf,buf->vb.i);
/* Fill buffer */
vivi_fillbuff(dev,buf);
if (list_empty(&dma_q->active)) {
del_timer(&dma_q->timeout);
} else {
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
}
}
if (bc != 1)
dprintk(1,"%s: %d buffers handled (should be 1)\n",__FUNCTION__,bc);
}
static void vivi_sleep(struct vivi_dmaqueue *dma_q)
{
int timeout;
DECLARE_WAITQUEUE(wait, current);
dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
add_wait_queue(&dma_q->wq, &wait);
if (!kthread_should_stop()) {
dma_q->frame++;
/* Calculate time to wake up */
timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
if (timeout <= 0) {
int old=dma_q->frame;
dma_q->frame=(jiffies_to_msecs(jiffies-dma_q->ini_jiffies)*WAKE_DENOMINATOR)/(WAKE_NUMERATOR*1000)+1;
timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
dprintk(1,"underrun, losed %d frames. "
"Now, frame is %d. Waking on %d jiffies\n",
dma_q->frame-old,dma_q->frame,timeout);
} else
dprintk(1,"will sleep for %i jiffies\n",timeout);
vivi_thread_tick(dma_q);
schedule_timeout_interruptible (timeout);
}
remove_wait_queue(&dma_q->wq, &wait);
try_to_freeze();
}
static int vivi_thread(void *data)
{
struct vivi_dmaqueue *dma_q=data;
dprintk(1,"thread started\n");
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
for (;;) {
vivi_sleep(dma_q);
if (kthread_should_stop())
break;
}
dprintk(1, "thread: exit\n");
return 0;
}
static int vivi_start_thread(struct vivi_dmaqueue *dma_q)
{
dma_q->frame=0;
dma_q->ini_jiffies=jiffies;
dprintk(1,"%s\n",__FUNCTION__);
dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
if (IS_ERR(dma_q->kthread)) {
printk(KERN_ERR "vivi: kernel_thread() failed\n");
return PTR_ERR(dma_q->kthread);
}
/* Wakes thread */
wake_up_interruptible(&dma_q->wq);
dprintk(1,"returning from %s\n",__FUNCTION__);
return 0;
}
static void vivi_stop_thread(struct vivi_dmaqueue *dma_q)
{
dprintk(1,"%s\n",__FUNCTION__);
/* shutdown control thread */
if (dma_q->kthread) {
kthread_stop(dma_q->kthread);
dma_q->kthread=NULL;
}
}
static int restart_video_queue(struct vivi_dmaqueue *dma_q)
{
struct vivi_buffer *buf, *prev;
struct list_head *item;
dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
if (!list_empty(&dma_q->active)) {
buf = list_entry(dma_q->active.next, struct vivi_buffer, vb.queue);
dprintk(2,"restart_queue [%p/%d]: restart dma\n",
buf, buf->vb.i);
dprintk(1,"Restarting video dma\n");
vivi_stop_thread(dma_q);
// vivi_start_thread(dma_q);
/* cancel all outstanding capture / vbi requests */
list_for_each(item,&dma_q->active) {
buf = list_entry(item, struct vivi_buffer, vb.queue);
list_del(&buf->vb.queue);
buf->vb.state = STATE_ERROR;
wake_up(&buf->vb.done);
}
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
return 0;
}
prev = NULL;
for (;;) {
if (list_empty(&dma_q->queued))
return 0;
buf = list_entry(dma_q->queued.next, struct vivi_buffer, vb.queue);
if (NULL == prev) {
list_del(&buf->vb.queue);
list_add_tail(&buf->vb.queue,&dma_q->active);
dprintk(1,"Restarting video dma\n");
vivi_stop_thread(dma_q);
vivi_start_thread(dma_q);
buf->vb.state = STATE_ACTIVE;
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
dprintk(2,"[%p/%d] restart_queue - first active\n",
buf,buf->vb.i);
} else if (prev->vb.width == buf->vb.width &&
prev->vb.height == buf->vb.height &&
prev->fmt == buf->fmt) {
list_del(&buf->vb.queue);
list_add_tail(&buf->vb.queue,&dma_q->active);
buf->vb.state = STATE_ACTIVE;
dprintk(2,"[%p/%d] restart_queue - move to active\n",
buf,buf->vb.i);
} else {
return 0;
}
prev = buf;
}
}
static void vivi_vid_timeout(unsigned long data)
{
struct vivi_dev *dev = (struct vivi_dev*)data;
struct vivi_dmaqueue *vidq = &dev->vidq;
struct vivi_buffer *buf;
while (!list_empty(&vidq->active)) {
buf = list_entry(vidq->active.next, struct vivi_buffer, vb.queue);
list_del(&buf->vb.queue);
buf->vb.state = STATE_ERROR;
wake_up(&buf->vb.done);
printk("vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
}
restart_video_queue(vidq);
}
/* ------------------------------------------------------------------
Videobuf operations
------------------------------------------------------------------*/
static int
buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
{
struct vivi_fh *fh = vq->priv_data;
*size = fh->width*fh->height*2;
if (0 == *count)
*count = 32;
while (*size * *count > vid_limit * 1024 * 1024)
(*count)--;
return 0;
}
static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
{
dprintk(1,"%s\n",__FUNCTION__);
if (in_interrupt())
BUG();
/*FIXME: Maybe a spinlock is required here */
kfree(buf->to_addr);
buf->to_addr=NULL;
videobuf_waiton(&buf->vb,0,0);
videobuf_dma_unmap(vq, &buf->vb.dma);
videobuf_dma_free(&buf->vb.dma);
buf->vb.state = STATE_NEEDS_INIT;
}
#define norm_maxw() 1024
#define norm_maxh() 768
static int
buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
enum v4l2_field field)
{
struct vivi_fh *fh = vq->priv_data;
struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
int rc, init_buffer = 0;
// dprintk(1,"%s, field=%d\n",__FUNCTION__,field);
BUG_ON(NULL == fh->fmt);
if (fh->width < 48 || fh->width > norm_maxw() ||
fh->height < 32 || fh->height > norm_maxh())
return -EINVAL;
buf->vb.size = fh->width*fh->height*2;
if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
return -EINVAL;
if (buf->fmt != fh->fmt ||
buf->vb.width != fh->width ||
buf->vb.height != fh->height ||
buf->vb.field != field) {
buf->fmt = fh->fmt;
buf->vb.width = fh->width;
buf->vb.height = fh->height;
buf->vb.field = field;
init_buffer = 1;
}
if (STATE_NEEDS_INIT == buf->vb.state) {
if (0 != (rc = videobuf_iolock(vq,&buf->vb,NULL)))
goto fail;
}
buf->vb.state = STATE_PREPARED;
if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
rc=-ENOMEM;
goto fail;
}
return 0;
fail:
free_buffer(vq,buf);
return rc;
}
static void
buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
struct vivi_fh *fh = vq->priv_data;
struct vivi_dev *dev = fh->dev;
struct vivi_dmaqueue *vidq = &dev->vidq;
struct vivi_buffer *prev;
if (!list_empty(&vidq->queued)) {
dprintk(1,"adding vb queue=0x%08lx\n",(unsigned long)&buf->vb.queue);
list_add_tail(&buf->vb.queue,&vidq->queued);
buf->vb.state = STATE_QUEUED;
dprintk(2,"[%p/%d] buffer_queue - append to queued\n",
buf, buf->vb.i);
} else if (list_empty(&vidq->active)) {
list_add_tail(&buf->vb.queue,&vidq->active);
buf->vb.state = STATE_ACTIVE;
mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
dprintk(2,"[%p/%d] buffer_queue - first active\n",
buf, buf->vb.i);
vivi_start_thread(vidq);
} else {
prev = list_entry(vidq->active.prev, struct vivi_buffer, vb.queue);
if (prev->vb.width == buf->vb.width &&
prev->vb.height == buf->vb.height &&
prev->fmt == buf->fmt) {
list_add_tail(&buf->vb.queue,&vidq->active);
buf->vb.state = STATE_ACTIVE;
dprintk(2,"[%p/%d] buffer_queue - append to active\n",
buf, buf->vb.i);
} else {
list_add_tail(&buf->vb.queue,&vidq->queued);
buf->vb.state = STATE_QUEUED;
dprintk(2,"[%p/%d] buffer_queue - first queued\n",
buf, buf->vb.i);
}
}
}
static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
struct vivi_fh *fh = vq->priv_data;
struct vivi_dev *dev = (struct vivi_dev*)fh->dev;
struct vivi_dmaqueue *vidq = &dev->vidq;
dprintk(1,"%s\n",__FUNCTION__);
vivi_stop_thread(vidq);
free_buffer(vq,buf);
}
static int vivi_map_sg(void *dev, struct scatterlist *sg, int nents,
int direction)
{
int i;
dprintk(1,"%s, number of pages=%d\n",__FUNCTION__,nents);
BUG_ON(direction == DMA_NONE);
for (i = 0; i < nents; i++ ) {
BUG_ON(!sg[i].page);
sg_dma_address(&sg[i]) = page_to_phys(sg[i].page) + sg[i].offset;
}
return nents;
}
static int vivi_unmap_sg(void *dev,struct scatterlist *sglist,int nr_pages,
int direction)
{
dprintk(1,"%s\n",__FUNCTION__);
return 0;
}
static int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist, int nr_pages,
int direction)
{
// dprintk(1,"%s\n",__FUNCTION__);
// flush_write_buffers();
return 0;
}
static struct videobuf_queue_ops vivi_video_qops = {
.buf_setup = buffer_setup,
.buf_prepare = buffer_prepare,
.buf_queue = buffer_queue,
.buf_release = buffer_release,
/* Non-pci handling routines */
.vb_map_sg = vivi_map_sg,
.vb_dma_sync_sg = vivi_dma_sync_sg,
.vb_unmap_sg = vivi_unmap_sg,
};
/* ------------------------------------------------------------------
IOCTL handling
------------------------------------------------------------------*/
static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
{
/* is it free? */
down(&dev->lock);
if (dev->resources) {
/* no, someone else uses it */
up(&dev->lock);
return 0;
}
/* it's free, grab it */
dev->resources =1;
dprintk(1,"res: get\n");
up(&dev->lock);
return 1;
}
static int res_locked(struct vivi_dev *dev)
{
return (dev->resources);
}
static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
{
down(&dev->lock);
dev->resources = 0;
dprintk(1,"res: put\n");
up(&dev->lock);
}
/* ------------------------------------------------------------------
IOCTL vidioc handling
------------------------------------------------------------------*/
static int vidioc_querycap (struct file *file, void *priv,
struct v4l2_capability *cap)
{
strcpy(cap->driver, "vivi");
strcpy(cap->card, "vivi");
cap->version = VIVI_VERSION;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;
return 0;
}
static int vidioc_enum_fmt_cap (struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
if (f->index > 0)
return -EINVAL;
strlcpy(f->description,format.name,sizeof(f->description));
f->pixelformat = format.fourcc;
return 0;
}
static int vidioc_g_fmt_cap (struct file *file, void *priv,
struct v4l2_format *f)
{
struct vivi_fh *fh=priv;
f->fmt.pix.width = fh->width;
f->fmt.pix.height = fh->height;
f->fmt.pix.field = fh->vb_vidq.field;
f->fmt.pix.pixelformat = fh->fmt->fourcc;
f->fmt.pix.bytesperline =
(f->fmt.pix.width * fh->fmt->depth) >> 3;
f->fmt.pix.sizeimage =
f->fmt.pix.height * f->fmt.pix.bytesperline;
return (0);
}
static int vidioc_try_fmt_cap (struct file *file, void *priv,
struct v4l2_format *f)
{
struct vivi_fmt *fmt;
enum v4l2_field field;
unsigned int maxw, maxh;
if (format.fourcc != f->fmt.pix.pixelformat) {
dprintk(1,"Fourcc format (0x%08x) invalid. Driver accepts "
"only 0x%08x\n",f->fmt.pix.pixelformat,format.fourcc);
return -EINVAL;
}
fmt=&format;
field = f->fmt.pix.field;
if (field == V4L2_FIELD_ANY) {
// field=V4L2_FIELD_INTERLACED;
field=V4L2_FIELD_SEQ_TB;
} else if (V4L2_FIELD_INTERLACED != field) {
dprintk(1,"Field type invalid.\n");
return -EINVAL;
}
maxw = norm_maxw();
maxh = norm_maxh();
f->fmt.pix.field = field;
if (f->fmt.pix.height < 32)
f->fmt.pix.height = 32;
if (f->fmt.pix.height > maxh)
f->fmt.pix.height = maxh;
if (f->fmt.pix.width < 48)
f->fmt.pix.width = 48;
if (f->fmt.pix.width > maxw)
f->fmt.pix.width = maxw;
f->fmt.pix.width &= ~0x03;
f->fmt.pix.bytesperline =
(f->fmt.pix.width * fmt->depth) >> 3;
f->fmt.pix.sizeimage =
f->fmt.pix.height * f->fmt.pix.bytesperline;
return 0;
}
/*FIXME: This seems to be generic enough to be at videodev2 */
static int vidioc_s_fmt_cap (struct file *file, void *priv,
struct v4l2_format *f)
{
struct vivi_fh *fh=priv;
int ret = vidioc_try_fmt_cap(file,fh,f);
if (ret < 0)
return (ret);
fh->fmt = &format;
fh->width = f->fmt.pix.width;
fh->height = f->fmt.pix.height;
fh->vb_vidq.field = f->fmt.pix.field;
fh->type = f->type;
return (0);
}
static int vidioc_reqbufs (struct file *file, void *priv, struct v4l2_requestbuffers *p)
{
struct vivi_fh *fh=priv;
return (videobuf_reqbufs(&fh->vb_vidq, p));
}
static int vidioc_querybuf (struct file *file, void *priv, struct v4l2_buffer *p)
{
struct vivi_fh *fh=priv;
return (videobuf_querybuf(&fh->vb_vidq, p));
}
static int vidioc_qbuf (struct file *file, void *priv, struct v4l2_buffer *p)
{
struct vivi_fh *fh=priv;
return (videobuf_qbuf(&fh->vb_vidq, p));
}
static int vidioc_dqbuf (struct file *file, void *priv, struct v4l2_buffer *p)
{
struct vivi_fh *fh=priv;
return (videobuf_dqbuf(&fh->vb_vidq, p,
file->f_flags & O_NONBLOCK));
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
static int vidiocgmbuf (struct file *file, void *priv, struct video_mbuf *mbuf)
{
struct vivi_fh *fh=priv;
struct videobuf_queue *q=&fh->vb_vidq;
struct v4l2_requestbuffers req;
unsigned int i;
int ret;
req.type = q->type;
req.count = 8;
req.memory = V4L2_MEMORY_MMAP;
ret = videobuf_reqbufs(q,&req);
if (ret < 0)
return (ret);
mbuf->frames = req.count;
mbuf->size = 0;
for (i = 0; i < mbuf->frames; i++) {
mbuf->offsets[i] = q->bufs[i]->boff;
mbuf->size += q->bufs[i]->bsize;
}
return (0);
}
#endif
static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
{
struct vivi_fh *fh=priv;
struct vivi_dev *dev = fh->dev;
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (i != fh->type)
return -EINVAL;
if (!res_get(dev,fh))
return -EBUSY;
return (videobuf_streamon(&fh->vb_vidq));
}
static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
{
struct vivi_fh *fh=priv;
struct vivi_dev *dev = fh->dev;
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (i != fh->type)
return -EINVAL;
videobuf_streamoff(&fh->vb_vidq);
res_free(dev,fh);
return (0);
}
static int vidioc_s_std (struct file *file, void *priv, v4l2_std_id *i)
{
return 0;
}
/* only one input in this sample driver */
static int vidioc_enum_input (struct file *file, void *priv,
struct v4l2_input *inp)
{
if (inp->index != 0)
return -EINVAL;
inp->type = V4L2_INPUT_TYPE_CAMERA;
inp->std = V4L2_STD_NTSC_M;
strcpy(inp->name,"Camera");
return (0);
}
static int vidioc_g_input (struct file *file, void *priv, unsigned int *i)
{
*i = 0;
return (0);
}
static int vidioc_s_input (struct file *file, void *priv, unsigned int i)
{
if (i > 0)
return -EINVAL;
return (0);
}
/* --- controls ---------------------------------------------- */
static int vidioc_queryctrl (struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (qc->id && qc->id == vivi_qctrl[i].id) {
memcpy(qc, &(vivi_qctrl[i]),
sizeof(*qc));
return (0);
}
return -EINVAL;
}
static int vidioc_g_ctrl (struct file *file, void *priv,
struct v4l2_control *ctrl)
{
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (ctrl->id == vivi_qctrl[i].id) {
ctrl->value=qctl_regs[i];
return (0);
}
return -EINVAL;
}
static int vidioc_s_ctrl (struct file *file, void *priv,
struct v4l2_control *ctrl)
{
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (ctrl->id == vivi_qctrl[i].id) {
if (ctrl->value <
vivi_qctrl[i].minimum
|| ctrl->value >
vivi_qctrl[i].maximum) {
return (-ERANGE);
}
qctl_regs[i]=ctrl->value;
return (0);
}
return -EINVAL;
}
/* ------------------------------------------------------------------
File operations for the device
------------------------------------------------------------------*/
#define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
static int vivi_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct vivi_dev *h,*dev = NULL;
struct vivi_fh *fh;
struct list_head *list;
enum v4l2_buf_type type = 0;
int i;
printk(KERN_DEBUG "vivi: open called (minor=%d)\n",minor);
list_for_each(list,&vivi_devlist) {
h = list_entry(list, struct vivi_dev, vivi_devlist);
if (h->vfd.minor == minor) {
dev = h;
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
}
}
if (NULL == dev)
return -ENODEV;
/* If more than one user, mutex should be added */
dev->users++;
dprintk(1,"open minor=%d type=%s users=%d\n",
minor,v4l2_type_names[type],dev->users);
/* allocate + initialize per filehandle data */
fh = kzalloc(sizeof(*fh),GFP_KERNEL);
if (NULL == fh) {
dev->users--;
return -ENOMEM;
}
file->private_data = fh;
fh->dev = dev;
fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fh->fmt = &format;
fh->width = 640;
fh->height = 480;
/* Put all controls at a sane state */
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
qctl_regs[i] =vivi_qctrl[i].default_value;
dprintk(1,"Open: fh=0x%08lx, dev=0x%08lx, dev->vidq=0x%08lx\n",
(unsigned long)fh,(unsigned long)dev,(unsigned long)&dev->vidq);
dprintk(1,"Open: list_empty queued=%d\n",list_empty(&dev->vidq.queued));
dprintk(1,"Open: list_empty active=%d\n",list_empty(&dev->vidq.active));
/* Resets frame counters */
dev->h=0;
dev->m=0;
dev->s=0;
dev->us=0;
dev->jiffies=jiffies;
sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
dev->h,dev->m,dev->s,(dev->us+500)/1000);
videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
NULL, NULL,
fh->type,
V4L2_FIELD_INTERLACED,
sizeof(struct vivi_buffer),fh);
return 0;
}
static ssize_t
vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
struct vivi_fh *fh = file->private_data;
if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
if (res_locked(fh->dev))
return -EBUSY;
return videobuf_read_one(&fh->vb_vidq, data, count, ppos,
file->f_flags & O_NONBLOCK);
}
return 0;
}
static unsigned int
vivi_poll(struct file *file, struct poll_table_struct *wait)
{
struct vivi_fh *fh = file->private_data;
struct vivi_buffer *buf;
dprintk(1,"%s\n",__FUNCTION__);
if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
return POLLERR;
if (res_get(fh->dev,fh)) {
dprintk(1,"poll: mmap interface\n");
/* streaming capture */
if (list_empty(&fh->vb_vidq.stream))
return POLLERR;
buf = list_entry(fh->vb_vidq.stream.next,struct vivi_buffer,vb.stream);
} else {
dprintk(1,"poll: read() interface\n");
/* read() capture */
buf = (struct vivi_buffer*)fh->vb_vidq.read_buf;
if (NULL == buf)
return POLLERR;
}
poll_wait(file, &buf->vb.done, wait);
if (buf->vb.state == STATE_DONE ||
buf->vb.state == STATE_ERROR)
return POLLIN|POLLRDNORM;
return 0;
}
static int vivi_release(struct inode *inode, struct file *file)
{
struct vivi_fh *fh = file->private_data;
struct vivi_dev *dev = fh->dev;
struct vivi_dmaqueue *vidq = &dev->vidq;
int minor = iminor(inode);
vivi_stop_thread(vidq);
videobuf_mmap_free(&fh->vb_vidq);
kfree (fh);
dev->users--;
printk(KERN_DEBUG "vivi: close called (minor=%d, users=%d)\n",minor,dev->users);
return 0;
}
static int
vivi_mmap(struct file *file, struct vm_area_struct * vma)
{
struct vivi_fh *fh = file->private_data;
int ret;
dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
ret=videobuf_mmap_mapper(&fh->vb_vidq, vma);
dprintk (1,"vma start=0x%08lx, size=%ld, ret=%d\n",
(unsigned long)vma->vm_start,
(unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
ret);
return ret;
}
static const struct file_operations vivi_fops = {
.owner = THIS_MODULE,
.open = vivi_open,
.release = vivi_release,
.read = vivi_read,
.poll = vivi_poll,
.ioctl = video_ioctl2, /* V4L2 ioctl handler */
.mmap = vivi_mmap,
.llseek = no_llseek,
};
static struct video_device vivi = {
.name = "vivi",
.type = VID_TYPE_CAPTURE,
.hardware = 0,
.fops = &vivi_fops,
.minor = -1,
// .release = video_device_release,
.vidioc_querycap = vidioc_querycap,
.vidioc_enum_fmt_cap = vidioc_enum_fmt_cap,
.vidioc_g_fmt_cap = vidioc_g_fmt_cap,
.vidioc_try_fmt_cap = vidioc_try_fmt_cap,
.vidioc_s_fmt_cap = vidioc_s_fmt_cap,
.vidioc_reqbufs = vidioc_reqbufs,
.vidioc_querybuf = vidioc_querybuf,
.vidioc_qbuf = vidioc_qbuf,
.vidioc_dqbuf = vidioc_dqbuf,
.vidioc_s_std = vidioc_s_std,
.vidioc_enum_input = vidioc_enum_input,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
.vidioc_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl,
.vidioc_streamon = vidioc_streamon,
.vidioc_streamoff = vidioc_streamoff,
#ifdef CONFIG_VIDEO_V4L1_COMPAT
.vidiocgmbuf = vidiocgmbuf,
#endif
.tvnorms = V4L2_STD_NTSC_M,
.current_norm = V4L2_STD_NTSC_M,
};
/* -----------------------------------------------------------------
Initialization and module stuff
------------------------------------------------------------------*/
static int __init vivi_init(void)
{
int ret;
struct vivi_dev *dev;
dev = kzalloc(sizeof(*dev),GFP_KERNEL);
if (NULL == dev)
return -ENOMEM;
list_add_tail(&dev->vivi_devlist,&vivi_devlist);
/* init video dma queues */
INIT_LIST_HEAD(&dev->vidq.active);
INIT_LIST_HEAD(&dev->vidq.queued);
init_waitqueue_head(&dev->vidq.wq);
/* initialize locks */
init_MUTEX(&dev->lock);
dev->vidq.timeout.function = vivi_vid_timeout;
dev->vidq.timeout.data = (unsigned long)dev;
init_timer(&dev->vidq.timeout);
ret = video_register_device(&vivi, VFL_TYPE_GRABBER, video_nr);
printk(KERN_INFO "Video Technology Magazine Virtual Video Capture Board (Load status: %d)\n", ret);
return ret;
}
static void __exit vivi_exit(void)
{
struct vivi_dev *h;
struct list_head *list;
while (!list_empty(&vivi_devlist)) {
list = vivi_devlist.next;
list_del(list);
h = list_entry(list, struct vivi_dev, vivi_devlist);
kfree (h);
}
video_unregister_device(&vivi);
}
module_init(vivi_init);
module_exit(vivi_exit);
MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
MODULE_LICENSE("Dual BSD/GPL");
module_param(video_nr, int, 0);
module_param_named(debug,vivi.debug, int, 0644);
MODULE_PARM_DESC(debug,"activates debug info");
module_param(vid_limit,int,0644);
MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
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