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linux/drivers/media/video/vivi.c

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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/mutex.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/videobuf-vmalloc.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 */
#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 int video_nr = -1; /* /dev/videoN, -1 for autodetect */
static int n_devs = 1; /* Number of virtual devices */
/* 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(dev, level, fmt, arg...) \
do { \
if (dev->vfd->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 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 mutex lock;
spinlock_t slock;
int users;
/* various device info */
struct video_device *vfd;
struct vivi_dmaqueue vidq;
/* Several counters */
int h, m, s, ms;
unsigned long jiffies;
char timestr[13];
int mv_count; /* Controls bars movement */
};
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,
BLACK,
};
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}, /* black */
};
#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 gen_line(char *basep, int inipos, int wmax,
int hmax, int line, int count, char *timestr)
{
int w, i, j, y;
int pos = inipos;
char *p, *s;
u8 chr, r, g, b, color;
/* We will just duplicate the second pixel at the packet */
wmax /= 2;
/* Generate a standard color bar pattern */
for (w = 0; w < wmax; w++) {
int colorpos = ((w + count) * 8/(wmax + 1)) % 8;
r = bars[colorpos][0];
g = bars[colorpos][1];
b = bars[colorpos][2];
for (color = 0; color < 4; color++) {
p = basep + pos;
switch (color) {
case 0:
case 2:
*p = TO_Y(r, g, b); /* Luma */
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 = 0;
g = 198;
b = 0;
} else {
/* Background color */
r = bars[BLACK][0];
g = bars[BLACK][1];
b = bars[BLACK][2];
}
pos = inipos + j * 2;
for (color = 0; color < 4; color++) {
p = basep + pos;
y = TO_Y(r, g, b);
switch (color) {
case 0:
case 2:
*p = TO_Y(r, g, b); /* Luma */
break;
case 1:
*p = TO_U(r, g, b); /* Cb */
break;
case 3:
*p = TO_V(r, g, b); /* Cr */
break;
}
pos++;
}
j++;
}
}
}
end:
return;
}
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 timeval ts;
char *tmpbuf = kmalloc(wmax * 2, GFP_KERNEL);
void *vbuf = videobuf_to_vmalloc(&buf->vb);
if (!tmpbuf)
return;
for (h = 0; h < hmax; h++) {
gen_line(tmpbuf, 0, wmax, hmax, h, dev->mv_count,
dev->timestr);
/* FIXME: replacing to __copy_to_user */
if (copy_to_user(vbuf + pos, tmpbuf, wmax * 2) != 0)
dprintk(dev, 2, "vivifill copy_to_user failed.\n");
pos += wmax*2;
}
dev->mv_count++;
kfree(tmpbuf);
/* Updates stream time */
dev->ms += jiffies_to_msecs(jiffies-dev->jiffies);
dev->jiffies = jiffies;
if (dev->ms >= 1000) {
dev->ms -= 1000;
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->ms);
dprintk(dev, 2, "vivifill at %s: Buffer 0x%08lx size= %d\n",
dev->timestr, (unsigned long)tmpbuf, pos);
/* Advice that buffer was filled */
buf->vb.state = VIDEOBUF_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;
spin_lock(&dev->slock);
/* Announces videobuf that all went ok */
for (bc = 0;; bc++) {
if (list_empty(&dma_q->active)) {
dprintk(dev, 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);
spin_unlock(&dev->slock);
return;
}
do_gettimeofday(&buf->vb.ts);
dprintk(dev, 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(dev, 1, "%s: %d buffers handled (should be 1)\n",
__FUNCTION__, bc);
spin_unlock(&dev->slock);
}
#define frames_to_ms(frames) \
((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
static void vivi_sleep(struct vivi_dmaqueue *dma_q)
{
struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
int timeout, running_time;
DECLARE_WAITQUEUE(wait, current);
dprintk(dev, 1, "%s dma_q=0x%08lx\n", __FUNCTION__,
(unsigned long)dma_q);
add_wait_queue(&dma_q->wq, &wait);
if (kthread_should_stop())
goto stop_task;
running_time = jiffies - dma_q->ini_jiffies;
dma_q->frame++;
/* Calculate time to wake up */
timeout = msecs_to_jiffies(frames_to_ms(dma_q->frame)) - running_time;
if (timeout > msecs_to_jiffies(frames_to_ms(2)) || timeout <= 0) {
int old = dma_q->frame;
int nframes;
dma_q->frame = (jiffies_to_msecs(running_time) /
frames_to_ms(1)) + 1;
timeout = msecs_to_jiffies(frames_to_ms(dma_q->frame))
- running_time;
if (unlikely (timeout <= 0))
timeout = 1;
nframes = (dma_q->frame > old)?
dma_q->frame - old : old - dma_q->frame;
dprintk(dev, 1, "%ld: %s %d frames. "
"Current frame is %d. Will sleep for %d jiffies\n",
jiffies,
(dma_q->frame > old)? "Underrun, losed" : "Overrun of",
nframes, dma_q->frame, timeout);
} else
dprintk(dev, 1, "will sleep for %d jiffies\n", timeout);
vivi_thread_tick(dma_q);
schedule_timeout_interruptible(timeout);
stop_task:
remove_wait_queue(&dma_q->wq, &wait);
try_to_freeze();
}
static int vivi_thread(void *data)
{
struct vivi_dmaqueue *dma_q = data;
struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
dprintk(dev, 1, "thread started\n");
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
set_freezable();
for (;;) {
vivi_sleep(dma_q);
if (kthread_should_stop())
break;
}
dprintk(dev, 1, "thread: exit\n");
return 0;
}
static int vivi_start_thread(struct vivi_dmaqueue *dma_q)
{
struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
dma_q->frame = 0;
dma_q->ini_jiffies = jiffies;
dprintk(dev, 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(dev, 1, "returning from %s\n", __FUNCTION__);
return 0;
}
static void vivi_stop_thread(struct vivi_dmaqueue *dma_q)
{
struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
dprintk(dev, 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_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
struct vivi_buffer *buf, *prev;
dprintk(dev, 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(dev, 2, "restart_queue [%p/%d]: restart dma\n",
buf, buf->vb.i);
dprintk(dev, 1, "Restarting video dma\n");
vivi_stop_thread(dma_q);
/* cancel all outstanding capture / vbi requests */
list_for_each_entry_safe(buf, prev, &dma_q->active, vb.queue) {
list_del(&buf->vb.queue);
buf->vb.state = VIDEOBUF_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(dev, 1, "Restarting video dma\n");
vivi_stop_thread(dma_q);
vivi_start_thread(dma_q);
buf->vb.state = VIDEOBUF_ACTIVE;
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
dprintk(dev, 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 = VIDEOBUF_ACTIVE;
dprintk(dev, 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;
spin_lock(&dev->slock);
while (!list_empty(&vidq->active)) {
buf = list_entry(vidq->active.next,
struct vivi_buffer, vb.queue);
list_del(&buf->vb.queue);
buf->vb.state = VIDEOBUF_ERROR;
wake_up(&buf->vb.done);
printk(KERN_INFO "vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
}
restart_video_queue(vidq);
spin_unlock(&dev->slock);
}
/* ------------------------------------------------------------------
Videobuf operations
------------------------------------------------------------------*/
static int
buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
{
struct vivi_fh *fh = vq->priv_data;
struct vivi_dev *dev = fh->dev;
*size = fh->width*fh->height*2;
if (0 == *count)
*count = 32;
while (*size * *count > vid_limit * 1024 * 1024)
(*count)--;
dprintk(dev, 1, "%s, count=%d, size=%d\n", __FUNCTION__,
*count, *size);
return 0;
}
static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
{
struct vivi_fh *fh = vq->priv_data;
struct vivi_dev *dev = fh->dev;
dprintk(dev, 1, "%s\n", __FUNCTION__);
if (in_interrupt())
BUG();
videobuf_waiton(&buf->vb, 0, 0);
videobuf_vmalloc_free(&buf->vb);
buf->vb.state = VIDEOBUF_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_dev *dev = fh->dev;
struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
int rc, init_buffer = 0;
dprintk(dev, 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 (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
rc = videobuf_iolock(vq, &buf->vb, NULL);
if (rc < 0)
goto fail;
}
buf->vb.state = VIDEOBUF_PREPARED;
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(dev, 1, "adding vb queue=0x%08lx\n",
(unsigned long)&buf->vb.queue);
list_add_tail(&buf->vb.queue, &vidq->queued);
buf->vb.state = VIDEOBUF_QUEUED;
dprintk(dev, 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 = VIDEOBUF_ACTIVE;
mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
dprintk(dev, 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 = VIDEOBUF_ACTIVE;
dprintk(dev, 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 = VIDEOBUF_QUEUED;
dprintk(dev, 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(dev, 1, "%s\n", __FUNCTION__);
vivi_stop_thread(vidq);
free_buffer(vq, buf);
}
static struct videobuf_queue_ops vivi_video_qops = {
.buf_setup = buffer_setup,
.buf_prepare = buffer_prepare,
.buf_queue = buffer_queue,
.buf_release = buffer_release,
};
/* ------------------------------------------------------------------
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_fh *fh = priv;
struct vivi_dev *dev = fh->dev;
struct vivi_fmt *fmt;
enum v4l2_field field;
unsigned int maxw, maxh;
if (format.fourcc != f->fmt.pix.pixelformat) {
dprintk(dev, 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;
} else if (V4L2_FIELD_INTERLACED != field) {
dprintk(dev, 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;
return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
}
#endif
static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
{
struct vivi_fh *fh = priv;
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (i != fh->type)
return -EINVAL;
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;
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (i != fh->type)
return -EINVAL;
return videobuf_streamoff(&fh->vb_vidq);
}
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_525_60;
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 *dev;
struct vivi_fh *fh;
int i;
printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
if (dev->vfd->minor == minor)
goto found;
return -ENODEV;
found:
/* If more than one user, mutex should be added */
dev->users++;
dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor,
v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], 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;
/* Resets frame counters */
dev->h = 0;
dev->m = 0;
dev->s = 0;
dev->ms = 0;
dev->mv_count = 0;
dev->jiffies = jiffies;
sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
dev->h, dev->m, dev->s, dev->ms);
videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
NULL, &dev->slock, 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) {
return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
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_dev *dev = fh->dev;
struct videobuf_queue *q = &fh->vb_vidq;
dprintk(dev, 1, "%s\n", __FUNCTION__);
if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
return POLLERR;
return videobuf_poll_stream(file, q, wait);
}
static int vivi_close(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_stop(&fh->vb_vidq);
videobuf_mmap_free(&fh->vb_vidq);
kfree(fh);
dev->users--;
dprintk(dev, 1, "close called (minor=%d, users=%d)\n",
minor, dev->users);
return 0;
}
static int vivi_release(void)
{
struct vivi_dev *dev;
struct list_head *list;
while (!list_empty(&vivi_devlist)) {
list = vivi_devlist.next;
list_del(list);
dev = list_entry(list, struct vivi_dev, vivi_devlist);
if (-1 != dev->vfd->minor)
video_unregister_device(dev->vfd);
else
video_device_release(dev->vfd);
kfree(dev);
}
return 0;
}
static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
{
struct vivi_fh *fh = file->private_data;
struct vivi_dev *dev = fh->dev;
int ret;
dprintk(dev, 1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
dprintk(dev, 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_close,
.read = vivi_read,
.poll = vivi_poll,
.ioctl = video_ioctl2, /* V4L2 ioctl handler */
.mmap = vivi_mmap,
.llseek = no_llseek,
};
static struct video_device vivi_template = {
.name = "vivi",
.type = VID_TYPE_CAPTURE,
.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_525_60,
.current_norm = V4L2_STD_NTSC_M,
};
/* -----------------------------------------------------------------
Initialization and module stuff
------------------------------------------------------------------*/
static int __init vivi_init(void)
{
int ret = -ENOMEM, i;
struct vivi_dev *dev;
struct video_device *vfd;
for (i = 0; i < n_devs; i++) {
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (NULL == dev)
break;
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 */
mutex_init(&dev->lock);
spin_lock_init(&dev->slock);
dev->vidq.timeout.function = vivi_vid_timeout;
dev->vidq.timeout.data = (unsigned long)dev;
init_timer(&dev->vidq.timeout);
vfd = video_device_alloc();
if (NULL == vfd)
break;
*vfd = vivi_template;
ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
if (ret < 0)
break;
snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
vivi_template.name, vfd->minor);
if (video_nr >= 0)
video_nr++;
dev->vfd = vfd;
}
if (ret < 0) {
vivi_release();
printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
} else
printk(KERN_INFO "Video Technology Magazine Virtual Video "
"Capture Board successfully loaded.\n");
return ret;
}
static void __exit vivi_exit(void)
{
vivi_release();
}
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_PARM_DESC(video_nr, "video iminor start number");
module_param(n_devs, int, 0);
MODULE_PARM_DESC(n_devs, "number of video devices to create");
module_param_named(debug, vivi_template.debug, int, 0444);
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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