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googlers / maze / linux / 5b77ae7776183d733ec86727bcc34c52a336afd6 / . / drivers / media / video / gspca / gspca.c
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/*
* Main USB camera driver
*
* V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
*
* 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 of the License, 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.
*/
#define MODULE_NAME "gspca"
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/io.h>
#include <asm/page.h>
#include <linux/uaccess.h>
#include <linux/jiffies.h>
#include "gspca.h"
/* global values */
#define DEF_NURBS 2 /* default number of URBs */
MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
MODULE_DESCRIPTION("GSPCA USB Camera Driver");
MODULE_LICENSE("GPL");
#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 1, 7)
static const char version[] = "2.1.7";
static int video_nr = -1;
#ifdef CONFIG_VIDEO_ADV_DEBUG
int gspca_debug = D_ERR | D_PROBE;
EXPORT_SYMBOL(gspca_debug);
static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
{
if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
txt,
pixfmt & 0xff,
(pixfmt >> 8) & 0xff,
(pixfmt >> 16) & 0xff,
pixfmt >> 24,
w, h);
} else {
PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
txt,
pixfmt,
w, h);
}
}
#else
#define PDEBUG_MODE(txt, pixfmt, w, h)
#endif
/* specific memory types - !! should different from V4L2_MEMORY_xxx */
#define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
#define GSPCA_MEMORY_READ 7
#define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
/*
* VMA operations.
*/
static void gspca_vm_open(struct vm_area_struct *vma)
{
struct gspca_frame *frame = vma->vm_private_data;
frame->vma_use_count++;
frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
}
static void gspca_vm_close(struct vm_area_struct *vma)
{
struct gspca_frame *frame = vma->vm_private_data;
if (--frame->vma_use_count <= 0)
frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
}
static struct vm_operations_struct gspca_vm_ops = {
.open = gspca_vm_open,
.close = gspca_vm_close,
};
/*
* fill a video frame from an URB and resubmit
*/
static void fill_frame(struct gspca_dev *gspca_dev,
struct urb *urb)
{
struct gspca_frame *frame;
__u8 *data; /* address of data in the iso message */
int i, j, len, st;
cam_pkt_op pkt_scan;
if (urb->status != 0) {
PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
return; /* disconnection ? */
}
pkt_scan = gspca_dev->sd_desc->pkt_scan;
for (i = 0; i < urb->number_of_packets; i++) {
/* check the availability of the frame buffer */
j = gspca_dev->fr_i;
j = gspca_dev->fr_queue[j];
frame = &gspca_dev->frame[j];
if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
!= V4L2_BUF_FLAG_QUEUED) {
gspca_dev->last_packet_type = DISCARD_PACKET;
break;
}
/* check the packet status and length */
len = urb->iso_frame_desc[i].actual_length;
if (len == 0)
continue;
st = urb->iso_frame_desc[i].status;
if (st) {
PDEBUG(D_ERR,
"ISOC data error: [%d] len=%d, status=%d",
i, len, st);
gspca_dev->last_packet_type = DISCARD_PACKET;
continue;
}
/* let the packet be analyzed by the subdriver */
PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
i, urb->iso_frame_desc[i].offset, len);
data = (__u8 *) urb->transfer_buffer
+ urb->iso_frame_desc[i].offset;
pkt_scan(gspca_dev, frame, data, len);
}
/* resubmit the URB */
urb->status = 0;
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
}
/*
* ISOC message interrupt from the USB device
*
* Analyse each packet and call the subdriver for copy to the frame buffer.
*/
static void isoc_irq(struct urb *urb
)
{
struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
PDEBUG(D_PACK, "isoc irq mmap");
if (!gspca_dev->streaming)
return;
fill_frame(gspca_dev, urb);
}
/*
* add data to the current frame
*
* This function is called by the subdrivers at interrupt level.
*
* To build a frame, these ones must add
* - one FIRST_PACKET
* - 0 or many INTER_PACKETs
* - one LAST_PACKET
* DISCARD_PACKET invalidates the whole frame.
* On LAST_PACKET, a new frame is returned.
*/
struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
int packet_type,
struct gspca_frame *frame,
const __u8 *data,
int len)
{
int i, j;
PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
/* when start of a new frame, if the current frame buffer
* is not queued, discard the whole frame */
if (packet_type == FIRST_PACKET) {
if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
!= V4L2_BUF_FLAG_QUEUED) {
gspca_dev->last_packet_type = DISCARD_PACKET;
return frame;
}
frame->data_end = frame->data;
jiffies_to_timeval(get_jiffies_64(),
&frame->v4l2_buf.timestamp);
frame->v4l2_buf.sequence = ++gspca_dev->sequence;
} else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
return frame;
}
/* append the packet to the frame buffer */
if (len > 0) {
if (frame->data_end - frame->data + len
> frame->v4l2_buf.length) {
PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
frame->data_end - frame->data + len,
frame->v4l2_buf.length);
packet_type = DISCARD_PACKET;
} else {
memcpy(frame->data_end, data, len);
frame->data_end += len;
}
}
gspca_dev->last_packet_type = packet_type;
/* if last packet, wake the application and advance in the queue */
if (packet_type == LAST_PACKET) {
frame->v4l2_buf.bytesused = frame->data_end - frame->data;
frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
atomic_inc(&gspca_dev->nevent);
wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
gspca_dev->fr_i = i;
PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
frame->v4l2_buf.bytesused,
gspca_dev->fr_q,
i,
gspca_dev->fr_o);
j = gspca_dev->fr_queue[i];
frame = &gspca_dev->frame[j];
}
return frame;
}
EXPORT_SYMBOL(gspca_frame_add);
static int gspca_is_compressed(__u32 format)
{
switch (format) {
case V4L2_PIX_FMT_MJPEG:
case V4L2_PIX_FMT_JPEG:
case V4L2_PIX_FMT_SPCA561:
case V4L2_PIX_FMT_PAC207:
return 1;
}
return 0;
}
static void *rvmalloc(unsigned long size)
{
void *mem;
unsigned long adr;
/* size = PAGE_ALIGN(size); (already done) */
mem = vmalloc_32(size);
if (mem != NULL) {
adr = (unsigned long) mem;
while ((long) size > 0) {
SetPageReserved(vmalloc_to_page((void *) adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
}
return mem;
}
static void rvfree(void *mem, long size)
{
unsigned long adr;
adr = (unsigned long) mem;
while (size > 0) {
ClearPageReserved(vmalloc_to_page((void *) adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
vfree(mem);
}
static int frame_alloc(struct gspca_dev *gspca_dev,
unsigned int count)
{
struct gspca_frame *frame;
unsigned int frsz;
int i;
i = gspca_dev->curr_mode;
frsz = gspca_dev->cam.cam_mode[i].sizeimage;
PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
frsz = PAGE_ALIGN(frsz);
gspca_dev->frsz = frsz;
if (count > GSPCA_MAX_FRAMES)
count = GSPCA_MAX_FRAMES;
gspca_dev->frbuf = rvmalloc(frsz * count);
if (!gspca_dev->frbuf) {
err("frame alloc failed");
return -ENOMEM;
}
gspca_dev->nframes = count;
for (i = 0; i < count; i++) {
frame = &gspca_dev->frame[i];
frame->v4l2_buf.index = i;
frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
frame->v4l2_buf.flags = 0;
frame->v4l2_buf.field = V4L2_FIELD_NONE;
frame->v4l2_buf.length = frsz;
frame->v4l2_buf.memory = gspca_dev->memory;
frame->v4l2_buf.sequence = 0;
frame->data = frame->data_end =
gspca_dev->frbuf + i * frsz;
frame->v4l2_buf.m.offset = i * frsz;
}
gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
gspca_dev->last_packet_type = DISCARD_PACKET;
gspca_dev->sequence = 0;
atomic_set(&gspca_dev->nevent, 0);
return 0;
}
static void frame_free(struct gspca_dev *gspca_dev)
{
int i;
PDEBUG(D_STREAM, "frame free");
if (gspca_dev->frbuf != NULL) {
rvfree(gspca_dev->frbuf,
gspca_dev->nframes * gspca_dev->frsz);
gspca_dev->frbuf = NULL;
for (i = 0; i < gspca_dev->nframes; i++)
gspca_dev->frame[i].data = NULL;
}
gspca_dev->nframes = 0;
}
static void destroy_urbs(struct gspca_dev *gspca_dev)
{
struct urb *urb;
unsigned int i;
PDEBUG(D_STREAM, "kill transfer");
for (i = 0; i < MAX_NURBS; ++i) {
urb = gspca_dev->urb[i];
if (urb == NULL)
break;
gspca_dev->urb[i] = NULL;
usb_kill_urb(urb);
if (urb->transfer_buffer != NULL)
usb_buffer_free(gspca_dev->dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
usb_free_urb(urb);
}
}
/*
* search an input isochronous endpoint in an alternate setting
*/
static struct usb_host_endpoint *alt_isoc(struct usb_host_interface *alt,
__u8 epaddr)
{
struct usb_host_endpoint *ep;
int i, attr;
epaddr |= USB_DIR_IN;
for (i = 0; i < alt->desc.bNumEndpoints; i++) {
ep = &alt->endpoint[i];
if (ep->desc.bEndpointAddress == epaddr) {
attr = ep->desc.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK;
if (attr == USB_ENDPOINT_XFER_ISOC)
return ep;
break;
}
}
return NULL;
}
/*
* search an input isochronous endpoint
*
* The endpoint is defined by the subdriver.
* Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
* This routine may be called many times when the bandwidth is too small
* (the bandwidth is checked on urb submit).
*/
struct usb_host_endpoint *get_isoc_ep(struct gspca_dev *gspca_dev)
{
struct usb_interface *intf;
struct usb_host_endpoint *ep;
int i, ret;
intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
ep = NULL;
i = gspca_dev->alt; /* previous alt setting */
while (--i > 0) { /* alt 0 is unusable */
ep = alt_isoc(&intf->altsetting[i], gspca_dev->cam.epaddr);
if (ep)
break;
}
if (ep == NULL) {
err("no ISOC endpoint found");
return NULL;
}
PDEBUG(D_STREAM, "use ISOC alt %d ep 0x%02x",
i, ep->desc.bEndpointAddress);
ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
if (ret < 0) {
err("set interface err %d", ret);
return NULL;
}
gspca_dev->alt = i; /* memorize the current alt setting */
return ep;
}
/*
* create the isochronous URBs
*/
static int create_urbs(struct gspca_dev *gspca_dev,
struct usb_host_endpoint *ep)
{
struct urb *urb;
int n, nurbs, i, psize, npkt, bsize;
/* calculate the packet size and the number of packets */
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
npkt = ISO_MAX_SIZE / psize;
if (npkt > ISO_MAX_PKT)
npkt = ISO_MAX_PKT;
bsize = psize * npkt;
PDEBUG(D_STREAM,
"isoc %d pkts size %d (bsize:%d)", npkt, psize, bsize);
nurbs = DEF_NURBS;
gspca_dev->nurbs = nurbs;
for (n = 0; n < nurbs; n++) {
urb = usb_alloc_urb(npkt, GFP_KERNEL);
if (!urb) {
err("usb_alloc_urb failed");
return -ENOMEM;
}
urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
bsize,
GFP_KERNEL,
&urb->transfer_dma);
if (urb->transfer_buffer == NULL) {
usb_free_urb(urb);
destroy_urbs(gspca_dev);
err("usb_buffer_urb failed");
return -ENOMEM;
}
gspca_dev->urb[n] = urb;
urb->dev = gspca_dev->dev;
urb->context = gspca_dev;
urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
ep->desc.bEndpointAddress);
urb->transfer_flags = URB_ISO_ASAP
| URB_NO_TRANSFER_DMA_MAP;
urb->interval = ep->desc.bInterval;
urb->complete = isoc_irq;
urb->number_of_packets = npkt;
urb->transfer_buffer_length = bsize;
for (i = 0; i < npkt; i++) {
urb->iso_frame_desc[i].length = psize;
urb->iso_frame_desc[i].offset = psize * i;
}
}
return 0;
}
/*
* start the USB transfer
*/
static int gspca_init_transfer(struct gspca_dev *gspca_dev)
{
struct usb_host_endpoint *ep;
int n, ret;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
/* set the higher alternate setting and
* loop until urb submit succeeds */
gspca_dev->alt = gspca_dev->nbalt;
for (;;) {
PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
ep = get_isoc_ep(gspca_dev);
if (ep == NULL) {
ret = -EIO;
goto out;
}
ret = create_urbs(gspca_dev, ep);
if (ret < 0)
goto out;
/* start the cam */
gspca_dev->sd_desc->start(gspca_dev);
gspca_dev->streaming = 1;
atomic_set(&gspca_dev->nevent, 0);
/* submit the URBs */
for (n = 0; n < gspca_dev->nurbs; n++) {
ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
if (ret < 0) {
PDEBUG(D_ERR|D_STREAM,
"usb_submit_urb [%d] err %d", n, ret);
gspca_dev->streaming = 0;
destroy_urbs(gspca_dev);
if (ret == -ENOSPC)
break; /* try the previous alt */
goto out;
}
}
if (ret >= 0)
break;
}
out:
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static int gspca_set_alt0(struct gspca_dev *gspca_dev)
{
int ret;
ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
if (ret < 0)
PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
return ret;
}
/* Note both the queue and the usb lock should be hold when calling this */
static void gspca_stream_off(struct gspca_dev *gspca_dev)
{
gspca_dev->streaming = 0;
atomic_set(&gspca_dev->nevent, 0);
if (gspca_dev->present) {
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
gspca_set_alt0(gspca_dev);
gspca_dev->sd_desc->stop0(gspca_dev);
PDEBUG(D_STREAM, "stream off OK");
}
}
static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
{
int i;
i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
gspca_dev->curr_mode = i;
gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
}
static int wxh_to_mode(struct gspca_dev *gspca_dev,
int width, int height)
{
int i;
for (i = gspca_dev->cam.nmodes; --i > 0; ) {
if (width >= gspca_dev->cam.cam_mode[i].width
&& height >= gspca_dev->cam.cam_mode[i].height)
break;
}
return i;
}
/*
* search a mode with the right pixel format
*/
static int gspca_get_mode(struct gspca_dev *gspca_dev,
int mode,
int pixfmt)
{
int modeU, modeD;
modeU = modeD = mode;
while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
if (--modeD >= 0) {
if (gspca_dev->cam.cam_mode[modeD].pixelformat
== pixfmt)
return modeD;
}
if (++modeU < gspca_dev->cam.nmodes) {
if (gspca_dev->cam.cam_mode[modeU].pixelformat
== pixfmt)
return modeU;
}
}
return -EINVAL;
}
static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *fmtdesc)
{
struct gspca_dev *gspca_dev = priv;
int i, j, index;
__u32 fmt_tb[8];
/* give an index to each format */
index = 0;
j = 0;
for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
j = 0;
for (;;) {
if (fmt_tb[j] == fmt_tb[index])
break;
j++;
}
if (j == index) {
if (fmtdesc->index == index)
break; /* new format */
index++;
if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
return -EINVAL;
}
}
if (i < 0)
return -EINVAL; /* no more format */
fmtdesc->pixelformat = fmt_tb[index];
if (gspca_is_compressed(fmt_tb[index]))
fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
fmtdesc->description[4] = '\0';
return 0;
}
static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *fmt)
{
struct gspca_dev *gspca_dev = priv;
int mode;
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
mode = gspca_dev->curr_mode;
memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
sizeof fmt->fmt.pix);
return 0;
}
static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
struct v4l2_format *fmt)
{
int w, h, mode, mode2;
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
w = fmt->fmt.pix.width;
h = fmt->fmt.pix.height;
#ifdef CONFIG_VIDEO_ADV_DEBUG
if (gspca_debug & D_CONF)
PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
#endif
/* search the closest mode for width and height */
mode = wxh_to_mode(gspca_dev, w, h);
/* OK if right palette */
if (gspca_dev->cam.cam_mode[mode].pixelformat
!= fmt->fmt.pix.pixelformat) {
/* else, search the closest mode with the same pixel format */
mode2 = gspca_get_mode(gspca_dev, mode,
fmt->fmt.pix.pixelformat);
if (mode2 >= 0)
mode = mode2;
/* else
; * no chance, return this mode */
}
memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
sizeof fmt->fmt.pix);
return mode; /* used when s_fmt */
}
static int vidioc_try_fmt_vid_cap(struct file *file,
void *priv,
struct v4l2_format *fmt)
{
struct gspca_dev *gspca_dev = priv;
int ret;
ret = try_fmt_vid_cap(gspca_dev, fmt);
if (ret < 0)
return ret;
return 0;
}
static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *fmt)
{
struct gspca_dev *gspca_dev = priv;
int ret;
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
ret = try_fmt_vid_cap(gspca_dev, fmt);
if (ret < 0)
goto out;
if (gspca_dev->nframes != 0
&& fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
ret = -EINVAL;
goto out;
}
if (ret == gspca_dev->curr_mode) {
ret = 0;
goto out; /* same mode */
}
if (gspca_dev->streaming) {
ret = -EBUSY;
goto out;
}
gspca_dev->width = fmt->fmt.pix.width;
gspca_dev->height = fmt->fmt.pix.height;
gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
gspca_dev->curr_mode = ret;
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
return ret;
}
static int dev_open(struct inode *inode, struct file *file)
{
struct gspca_dev *gspca_dev;
int ret;
PDEBUG(D_STREAM, "%s open", current->comm);
gspca_dev = (struct gspca_dev *) video_devdata(file);
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
/* if not done yet, initialize the sensor */
if (gspca_dev->users == 0) {
if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
ret = -ERESTARTSYS;
goto out;
}
ret = gspca_dev->sd_desc->open(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
if (ret != 0) {
PDEBUG(D_ERR|D_CONF, "init device failed %d", ret);
goto out;
}
} else if (gspca_dev->users > 4) { /* (arbitrary value) */
ret = -EBUSY;
goto out;
}
gspca_dev->users++;
file->private_data = gspca_dev;
#ifdef CONFIG_VIDEO_ADV_DEBUG
/* activate the v4l2 debug */
if (gspca_debug & D_V4L2)
gspca_dev->vdev.debug |= 3;
else
gspca_dev->vdev.debug &= ~3;
#endif
out:
mutex_unlock(&gspca_dev->queue_lock);
if (ret != 0)
PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
else
PDEBUG(D_STREAM, "open done");
return ret;
}
static int dev_close(struct inode *inode, struct file *file)
{
struct gspca_dev *gspca_dev = file->private_data;
PDEBUG(D_STREAM, "%s close", current->comm);
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
gspca_dev->users--;
/* if the file did the capture, free the streaming resources */
if (gspca_dev->capt_file == file) {
mutex_lock(&gspca_dev->usb_lock);
if (gspca_dev->streaming)
gspca_stream_off(gspca_dev);
gspca_dev->sd_desc->close(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
frame_free(gspca_dev);
gspca_dev->capt_file = NULL;
gspca_dev->memory = GSPCA_MEMORY_NO;
}
file->private_data = NULL;
mutex_unlock(&gspca_dev->queue_lock);
PDEBUG(D_STREAM, "close done");
return 0;
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct gspca_dev *gspca_dev = priv;
memset(cap, 0, sizeof *cap);
strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card);
strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
sizeof cap->bus_info);
cap->version = DRIVER_VERSION_NUMBER;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_STREAMING
| V4L2_CAP_READWRITE;
return 0;
}
/* the use of V4L2_CTRL_FLAG_NEXT_CTRL asks for the controls to be sorted */
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *q_ctrl)
{
struct gspca_dev *gspca_dev = priv;
int i;
u32 id;
id = q_ctrl->id;
if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
id &= V4L2_CTRL_ID_MASK;
id++;
for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
if (id >= gspca_dev->sd_desc->ctrls[i].qctrl.id) {
memcpy(q_ctrl,
&gspca_dev->sd_desc->ctrls[i].qctrl,
sizeof *q_ctrl);
return 0;
}
}
return -EINVAL;
}
for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
memcpy(q_ctrl,
&gspca_dev->sd_desc->ctrls[i].qctrl,
sizeof *q_ctrl);
return 0;
}
}
if (id >= V4L2_CID_BASE
&& id <= V4L2_CID_LASTP1) {
q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
return 0;
}
return -EINVAL;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct gspca_dev *gspca_dev = priv;
const struct ctrl *ctrls;
int i, ret;
for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
i < gspca_dev->sd_desc->nctrls;
i++, ctrls++) {
if (ctrl->id != ctrls->qctrl.id)
continue;
if (ctrl->value < ctrls->qctrl.minimum
&& ctrl->value > ctrls->qctrl.maximum)
return -ERANGE;
PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = ctrls->set(gspca_dev, ctrl->value);
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
return -EINVAL;
}
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct gspca_dev *gspca_dev = priv;
const struct ctrl *ctrls;
int i, ret;
for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
i < gspca_dev->sd_desc->nctrls;
i++, ctrls++) {
if (ctrl->id != ctrls->qctrl.id)
continue;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = ctrls->get(gspca_dev, &ctrl->value);
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
return -EINVAL;
}
static int vidioc_querymenu(struct file *file, void *priv,
struct v4l2_querymenu *qmenu)
{
struct gspca_dev *gspca_dev = priv;
if (!gspca_dev->sd_desc->querymenu)
return -EINVAL;
return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
}
static int vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *input)
{
struct gspca_dev *gspca_dev = priv;
if (input->index != 0)
return -EINVAL;
memset(input, 0, sizeof *input);
input->type = V4L2_INPUT_TYPE_CAMERA;
strncpy(input->name, gspca_dev->sd_desc->name,
sizeof input->name);
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);
}
static int vidioc_reqbufs(struct file *file, void *priv,
struct v4l2_requestbuffers *rb)
{
struct gspca_dev *gspca_dev = priv;
int i, ret = 0;
if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
switch (rb->memory) {
case GSPCA_MEMORY_READ: /* (internal call) */
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_USERPTR:
break;
default:
return -EINVAL;
}
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
if (gspca_dev->memory != GSPCA_MEMORY_NO
&& gspca_dev->memory != rb->memory) {
ret = -EBUSY;
goto out;
}
/* only one file may do the capture */
if (gspca_dev->capt_file != NULL
&& gspca_dev->capt_file != file) {
ret = -EBUSY;
goto out;
}
/* if allocated, the buffers must not be mapped */
for (i = 0; i < gspca_dev->nframes; i++) {
if (gspca_dev->frame[i].vma_use_count) {
ret = -EBUSY;
goto out;
}
}
/* stop streaming */
if (gspca_dev->streaming) {
mutex_lock(&gspca_dev->usb_lock);
gspca_stream_off(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
}
/* free the previous allocated buffers, if any */
if (gspca_dev->nframes != 0) {
frame_free(gspca_dev);
gspca_dev->capt_file = NULL;
}
if (rb->count == 0) /* unrequest */
goto out;
gspca_dev->memory = rb->memory;
ret = frame_alloc(gspca_dev, rb->count);
if (ret == 0) {
rb->count = gspca_dev->nframes;
gspca_dev->capt_file = file;
}
out:
mutex_unlock(&gspca_dev->queue_lock);
PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
return ret;
}
static int vidioc_querybuf(struct file *file, void *priv,
struct v4l2_buffer *v4l2_buf)
{
struct gspca_dev *gspca_dev = priv;
struct gspca_frame *frame;
if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
|| v4l2_buf->index < 0
|| v4l2_buf->index >= gspca_dev->nframes)
return -EINVAL;
frame = &gspca_dev->frame[v4l2_buf->index];
memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
return 0;
}
static int vidioc_streamon(struct file *file, void *priv,
enum v4l2_buf_type buf_type)
{
struct gspca_dev *gspca_dev = priv;
int ret;
if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
if (gspca_dev->nframes == 0) {
ret = -EINVAL;
goto out;
}
if (!gspca_dev->streaming) {
ret = gspca_init_transfer(gspca_dev);
if (ret < 0)
goto out;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
if (gspca_debug & D_STREAM) {
PDEBUG_MODE("stream on OK",
gspca_dev->pixfmt,
gspca_dev->width,
gspca_dev->height);
}
#endif
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
return ret;
}
static int vidioc_streamoff(struct file *file, void *priv,
enum v4l2_buf_type buf_type)
{
struct gspca_dev *gspca_dev = priv;
int i, ret;
if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (!gspca_dev->streaming)
return 0;
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
/* stop streaming */
if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
ret = -ERESTARTSYS;
goto out;
}
gspca_stream_off(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
/* empty the application queues */
for (i = 0; i < gspca_dev->nframes; i++)
gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
gspca_dev->last_packet_type = DISCARD_PACKET;
gspca_dev->sequence = 0;
atomic_set(&gspca_dev->nevent, 0);
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
return ret;
}
static int vidioc_g_jpegcomp(struct file *file, void *priv,
struct v4l2_jpegcompression *jpegcomp)
{
struct gspca_dev *gspca_dev = priv;
int ret;
if (!gspca_dev->sd_desc->get_jcomp)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static int vidioc_s_jpegcomp(struct file *file, void *priv,
struct v4l2_jpegcompression *jpegcomp)
{
struct gspca_dev *gspca_dev = priv;
int ret;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
if (!gspca_dev->sd_desc->set_jcomp)
return -EINVAL;
ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static int vidioc_g_parm(struct file *filp, void *priv,
struct v4l2_streamparm *parm)
{
struct gspca_dev *gspca_dev = priv;
memset(parm, 0, sizeof *parm);
parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
parm->parm.capture.readbuffers = gspca_dev->nbufread;
return 0;
}
static int vidioc_s_parm(struct file *filp, void *priv,
struct v4l2_streamparm *parm)
{
struct gspca_dev *gspca_dev = priv;
int n;
n = parm->parm.capture.readbuffers;
if (n == 0 || n > GSPCA_MAX_FRAMES)
parm->parm.capture.readbuffers = gspca_dev->nbufread;
else
gspca_dev->nbufread = n;
return 0;
}
static int vidioc_s_std(struct file *filp, void *priv,
v4l2_std_id *parm)
{
return 0;
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
static int vidiocgmbuf(struct file *file, void *priv,
struct video_mbuf *mbuf)
{
struct gspca_dev *gspca_dev = file->private_data;
int i;
PDEBUG(D_STREAM, "cgmbuf");
if (gspca_dev->nframes == 0) {
int ret;
{
struct v4l2_format fmt;
memset(&fmt, 0, sizeof fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
i = gspca_dev->cam.nmodes - 1; /* highest mode */
fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
if (ret != 0)
return ret;
}
{
struct v4l2_requestbuffers rb;
memset(&rb, 0, sizeof rb);
rb.count = 4;
rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
rb.memory = V4L2_MEMORY_MMAP;
ret = vidioc_reqbufs(file, priv, &rb);
if (ret != 0)
return ret;
}
}
mbuf->frames = gspca_dev->nframes;
mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
for (i = 0; i < mbuf->frames; i++)
mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
return 0;
}
#endif
static int dev_mmap(struct file *file, struct vm_area_struct *vma)
{
struct gspca_dev *gspca_dev = file->private_data;
struct gspca_frame *frame;
struct page *page;
unsigned long addr, start, size;
int i, ret;
start = vma->vm_start;
size = vma->vm_end - vma->vm_start;
PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
if (gspca_dev->capt_file != file) {
ret = -EINVAL;
goto out;
}
frame = NULL;
for (i = 0; i < gspca_dev->nframes; ++i) {
if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
PDEBUG(D_STREAM, "mmap bad memory type");
break;
}
if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
== vma->vm_pgoff) {
frame = &gspca_dev->frame[i];
break;
}
}
if (frame == NULL) {
PDEBUG(D_STREAM, "mmap no frame buffer found");
ret = -EINVAL;
goto out;
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
/* v4l1 maps all the buffers */
if (i != 0
|| size != frame->v4l2_buf.length * gspca_dev->nframes)
#endif
if (size != frame->v4l2_buf.length) {
PDEBUG(D_STREAM, "mmap bad size");
ret = -EINVAL;
goto out;
}
/*
* - VM_IO marks the area as being a mmaped region for I/O to a
* device. It also prevents the region from being core dumped.
*/
vma->vm_flags |= VM_IO;
addr = (unsigned long) frame->data;
while (size > 0) {
page = vmalloc_to_page((void *) addr);
ret = vm_insert_page(vma, start, page);
if (ret < 0)
goto out;
start += PAGE_SIZE;
addr += PAGE_SIZE;
size -= PAGE_SIZE;
}
vma->vm_ops = &gspca_vm_ops;
vma->vm_private_data = frame;
gspca_vm_open(vma);
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
return ret;
}
/*
* wait for a video frame
*
* If a frame is ready, its index is returned.
*/
static int frame_wait(struct gspca_dev *gspca_dev,
int nonblock_ing)
{
struct gspca_frame *frame;
int i, j, ret;
/* check if a frame is ready */
i = gspca_dev->fr_o;
j = gspca_dev->fr_queue[i];
frame = &gspca_dev->frame[j];
if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
atomic_dec(&gspca_dev->nevent);
goto ok;
}
if (nonblock_ing) /* no frame yet */
return -EAGAIN;
/* wait till a frame is ready */
for (;;) {
ret = wait_event_interruptible_timeout(gspca_dev->wq,
atomic_read(&gspca_dev->nevent) > 0,
msecs_to_jiffies(3000));
if (ret <= 0) {
if (ret < 0)
return ret; /* interrupt */
return -EIO; /* timeout */
}
atomic_dec(&gspca_dev->nevent);
if (!gspca_dev->streaming || !gspca_dev->present)
return -EIO;
i = gspca_dev->fr_o;
j = gspca_dev->fr_queue[i];
frame = &gspca_dev->frame[j];
if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
break;
}
ok:
gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
gspca_dev->fr_q,
gspca_dev->fr_i,
gspca_dev->fr_o);
if (gspca_dev->sd_desc->dq_callback)
gspca_dev->sd_desc->dq_callback(gspca_dev);
return j;
}
/*
* dequeue a video buffer
*
* If nonblock_ing is false, block until a buffer is available.
*/
static int vidioc_dqbuf(struct file *file, void *priv,
struct v4l2_buffer *v4l2_buf)
{
struct gspca_dev *gspca_dev = priv;
struct gspca_frame *frame;
int i, ret;
PDEBUG(D_FRAM, "dqbuf");
if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (v4l2_buf->memory != gspca_dev->memory)
return -EINVAL;
/* if not streaming, be sure the application will not loop forever */
if (!(file->f_flags & O_NONBLOCK)
&& !gspca_dev->streaming && gspca_dev->users == 1)
return -EINVAL;
/* only the capturing file may dequeue */
if (gspca_dev->capt_file != file)
return -EINVAL;
/* only one dequeue / read at a time */
if (mutex_lock_interruptible(&gspca_dev->read_lock))
return -ERESTARTSYS;
ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
if (ret < 0)
goto out;
i = ret; /* frame index */
frame = &gspca_dev->frame[i];
if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
if (copy_to_user((__u8 *) frame->v4l2_buf.m.userptr,
frame->data,
frame->v4l2_buf.bytesused)) {
PDEBUG(D_ERR|D_STREAM,
"dqbuf cp to user failed");
ret = -EFAULT;
goto out;
}
}
frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
PDEBUG(D_FRAM, "dqbuf %d", i);
ret = 0;
out:
mutex_unlock(&gspca_dev->read_lock);
return ret;
}
/*
* queue a video buffer
*
* Attempting to queue a buffer that has already been
* queued will return -EINVAL.
*/
static int vidioc_qbuf(struct file *file, void *priv,
struct v4l2_buffer *v4l2_buf)
{
struct gspca_dev *gspca_dev = priv;
struct gspca_frame *frame;
int i, index, ret;
PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
index = v4l2_buf->index;
if ((unsigned) index >= gspca_dev->nframes) {
PDEBUG(D_FRAM,
"qbuf idx %d >= %d", index, gspca_dev->nframes);
ret = -EINVAL;
goto out;
}
if (v4l2_buf->memory != gspca_dev->memory) {
PDEBUG(D_FRAM, "qbuf bad memory type");
ret = -EINVAL;
goto out;
}
frame = &gspca_dev->frame[index];
if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
PDEBUG(D_FRAM, "qbuf bad state");
ret = -EINVAL;
goto out;
}
frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
/* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
frame->v4l2_buf.length = v4l2_buf->length;
}
/* put the buffer in the 'queued' queue */
i = gspca_dev->fr_q;
gspca_dev->fr_queue[i] = index;
gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
gspca_dev->fr_q,
gspca_dev->fr_i,
gspca_dev->fr_o);
v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
return ret;
}
/*
* allocate the resources for read()
*/
static int read_alloc(struct gspca_dev *gspca_dev,
struct file *file)
{
struct v4l2_buffer v4l2_buf;
int i, ret;
PDEBUG(D_STREAM, "read alloc");
if (gspca_dev->nframes == 0) {
struct v4l2_requestbuffers rb;
memset(&rb, 0, sizeof rb);
rb.count = gspca_dev->nbufread;
rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
rb.memory = GSPCA_MEMORY_READ;
ret = vidioc_reqbufs(file, gspca_dev, &rb);
if (ret != 0) {
PDEBUG(D_STREAM, "read reqbuf err %d", ret);
return ret;
}
memset(&v4l2_buf, 0, sizeof v4l2_buf);
v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
v4l2_buf.memory = GSPCA_MEMORY_READ;
for (i = 0; i < gspca_dev->nbufread; i++) {
v4l2_buf.index = i;
ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
if (ret != 0) {
PDEBUG(D_STREAM, "read qbuf err: %d", ret);
return ret;
}
}
gspca_dev->memory = GSPCA_MEMORY_READ;
}
/* start streaming */
ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
if (ret != 0)
PDEBUG(D_STREAM, "read streamon err %d", ret);
return ret;
}
static unsigned int dev_poll(struct file *file, poll_table *wait)
{
struct gspca_dev *gspca_dev = file->private_data;
int i, ret;
PDEBUG(D_FRAM, "poll");
poll_wait(file, &gspca_dev->wq, wait);
if (!gspca_dev->present)
return POLLERR;
/* if reqbufs is not done, the user would use read() */
if (gspca_dev->nframes == 0) {
if (gspca_dev->memory != GSPCA_MEMORY_NO)
return POLLERR; /* not the 1st time */
ret = read_alloc(gspca_dev, file);
if (ret != 0)
return POLLERR;
}
if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
return POLLERR;
if (!gspca_dev->present) {
ret = POLLERR;
goto out;
}
/* check the next incoming buffer */
i = gspca_dev->fr_o;
i = gspca_dev->fr_queue[i];
if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
ret = POLLIN | POLLRDNORM; /* something to read */
else
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
return ret;
}
static ssize_t dev_read(struct file *file, char __user *data,
size_t count, loff_t *ppos)
{
struct gspca_dev *gspca_dev = file->private_data;
struct gspca_frame *frame;
struct v4l2_buffer v4l2_buf;
struct timeval timestamp;
int n, ret, ret2;
PDEBUG(D_FRAM, "read (%zd)", count);
if (!gspca_dev->present)
return -ENODEV;
switch (gspca_dev->memory) {
case GSPCA_MEMORY_NO: /* first time */
ret = read_alloc(gspca_dev, file);
if (ret != 0)
return ret;
break;
case GSPCA_MEMORY_READ:
if (gspca_dev->capt_file == file)
break;
/* fall thru */
default:
return -EINVAL;
}
/* get a frame */
jiffies_to_timeval(get_jiffies_64(), &timestamp);
timestamp.tv_sec--;
n = 2;
for (;;) {
memset(&v4l2_buf, 0, sizeof v4l2_buf);
v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
v4l2_buf.memory = GSPCA_MEMORY_READ;
ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
if (ret != 0) {
PDEBUG(D_STREAM, "read dqbuf err %d", ret);
return ret;
}
/* if the process slept for more than 1 second,
* get anewer frame */
frame = &gspca_dev->frame[v4l2_buf.index];
if (--n < 0)
break; /* avoid infinite loop */
if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
break;
ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
if (ret != 0) {
PDEBUG(D_STREAM, "read qbuf err %d", ret);
return ret;
}
}
/* copy the frame */
if (count > frame->v4l2_buf.bytesused)
count = frame->v4l2_buf.bytesused;
ret = copy_to_user(data, frame->data, count);
if (ret != 0) {
PDEBUG(D_ERR|D_STREAM,
"read cp to user lack %d / %zd", ret, count);
ret = -EFAULT;
goto out;
}
ret = count;
out:
/* in each case, requeue the buffer */
ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
if (ret2 != 0)
return ret2;
return ret;
}
static void dev_release(struct video_device *vfd)
{
/* nothing */
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.open = dev_open,
.release = dev_close,
.read = dev_read,
.mmap = dev_mmap,
.ioctl = video_ioctl2,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,
#endif
.llseek = no_llseek,
.poll = dev_poll,
};
static struct video_device gspca_template = {
.name = "gspca main driver",
.type = VID_TYPE_CAPTURE,
.fops = &dev_fops,
.release = dev_release, /* mandatory */
.minor = -1,
.vidioc_querycap = vidioc_querycap,
.vidioc_dqbuf = vidioc_dqbuf,
.vidioc_qbuf = vidioc_qbuf,
.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
.vidioc_streamon = vidioc_streamon,
.vidioc_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl,
.vidioc_querymenu = vidioc_querymenu,
.vidioc_enum_input = vidioc_enum_input,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
.vidioc_reqbufs = vidioc_reqbufs,
.vidioc_querybuf = vidioc_querybuf,
.vidioc_streamoff = vidioc_streamoff,
.vidioc_g_jpegcomp = vidioc_g_jpegcomp,
.vidioc_s_jpegcomp = vidioc_s_jpegcomp,
.vidioc_g_parm = vidioc_g_parm,
.vidioc_s_parm = vidioc_s_parm,
.vidioc_s_std = vidioc_s_std,
#ifdef CONFIG_VIDEO_V4L1_COMPAT
.vidiocgmbuf = vidiocgmbuf,
#endif
};
/*
* probe and create a new gspca device
*
* This function must be called by the sub-driver when it is
* called for probing a new device.
*/
int gspca_dev_probe(struct usb_interface *intf,
const struct usb_device_id *id,
const struct sd_desc *sd_desc,
int dev_size,
struct module *module)
{
struct usb_interface_descriptor *interface;
struct gspca_dev *gspca_dev;
struct usb_device *dev = interface_to_usbdev(intf);
int ret;
PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
/* we don't handle multi-config cameras */
if (dev->descriptor.bNumConfigurations != 1)
return -ENODEV;
interface = &intf->cur_altsetting->desc;
if (interface->bInterfaceNumber > 0)
return -ENODEV;
/* create the device */
if (dev_size < sizeof *gspca_dev)
dev_size = sizeof *gspca_dev;
gspca_dev = kzalloc(dev_size, GFP_KERNEL);
if (gspca_dev == NULL) {
err("couldn't kzalloc gspca struct");
return -EIO;
}
gspca_dev->dev = dev;
gspca_dev->iface = interface->bInterfaceNumber;
gspca_dev->nbalt = intf->num_altsetting;
gspca_dev->sd_desc = sd_desc;
/* gspca_dev->users = 0; (done by kzalloc) */
gspca_dev->nbufread = 2;
/* configure the subdriver */
ret = gspca_dev->sd_desc->config(gspca_dev, id);
if (ret < 0)
goto out;
ret = gspca_set_alt0(gspca_dev);
if (ret < 0)
goto out;
gspca_set_default_mode(gspca_dev);
mutex_init(&gspca_dev->usb_lock);
mutex_init(&gspca_dev->read_lock);
mutex_init(&gspca_dev->queue_lock);
init_waitqueue_head(&gspca_dev->wq);
/* init video stuff */
memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
gspca_dev->vdev.dev = &dev->dev;
memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
gspca_dev->vdev.fops = &gspca_dev->fops;
gspca_dev->fops.owner = module; /* module protection */
ret = video_register_device(&gspca_dev->vdev,
VFL_TYPE_GRABBER,
video_nr);
if (ret < 0) {
err("video_register_device err %d", ret);
goto out;
}
gspca_dev->present = 1;
usb_set_intfdata(intf, gspca_dev);
PDEBUG(D_PROBE, "probe ok");
return 0;
out:
kfree(gspca_dev);
return ret;
}
EXPORT_SYMBOL(gspca_dev_probe);
/*
* USB disconnection
*
* This function must be called by the sub-driver
* when the device disconnects, after the specific resources are freed.
*/
void gspca_disconnect(struct usb_interface *intf)
{
struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
if (!gspca_dev)
return;
gspca_dev->present = 0;
mutex_lock(&gspca_dev->queue_lock);
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->streaming = 0;
destroy_urbs(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
mutex_unlock(&gspca_dev->queue_lock);
while (gspca_dev->users != 0) { /* wait until fully closed */
atomic_inc(&gspca_dev->nevent);
wake_up_interruptible(&gspca_dev->wq); /* wake processes */
schedule();
}
/* We don't want people trying to open up the device */
video_unregister_device(&gspca_dev->vdev);
/* Free the memory */
kfree(gspca_dev);
PDEBUG(D_PROBE, "disconnect complete");
}
EXPORT_SYMBOL(gspca_disconnect);
/* -- cam driver utility functions -- */
/* auto gain and exposure algorithm based on the knee algorithm described here:
http://ytse.tricolour.net/docs/LowLightOptimization.html
Returns 0 if no changes were made, 1 if the gain and or exposure settings
where changed. */
int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
{
int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
const struct ctrl *gain_ctrl = NULL;
const struct ctrl *exposure_ctrl = NULL;
const struct ctrl *autogain_ctrl = NULL;
int retval = 0;
for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
}
if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
"on cam without (auto)gain/exposure");
return 0;
}
if (gain_ctrl->get(gspca_dev, &gain) ||
exposure_ctrl->get(gspca_dev, &exposure) ||
autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
return 0;
orig_gain = gain;
orig_exposure = exposure;
/* If we are of a multiple of deadzone, do multiple steps to reach the
desired lumination fast (with the risc of a slight overshoot) */
steps = abs(desired_avg_lum - avg_lum) / deadzone;
PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
avg_lum, desired_avg_lum, steps);
for (i = 0; i < steps; i++) {
if (avg_lum > desired_avg_lum) {
if (gain > gain_knee)
gain--;
else if (exposure > exposure_knee)
exposure--;
else if (gain > gain_ctrl->qctrl.default_value)
gain--;
else if (exposure > exposure_ctrl->qctrl.minimum)
exposure--;
else if (gain > gain_ctrl->qctrl.minimum)
gain--;
else
break;
} else {
if (gain < gain_ctrl->qctrl.default_value)
gain++;
else if (exposure < exposure_knee)
exposure++;
else if (gain < gain_knee)
gain++;
else if (exposure < exposure_ctrl->qctrl.maximum)
exposure++;
else if (gain < gain_ctrl->qctrl.maximum)
gain++;
else
break;
}
}
if (gain != orig_gain) {
gain_ctrl->set(gspca_dev, gain);
retval = 1;
}
if (exposure != orig_exposure) {
exposure_ctrl->set(gspca_dev, exposure);
retval = 1;
}
return retval;
}
EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
/* -- module insert / remove -- */
static int __init gspca_init(void)
{
info("main v%s registered", version);
return 0;
}
static void __exit gspca_exit(void)
{
info("main deregistered");
}
module_init(gspca_init);
module_exit(gspca_exit);
#ifdef CONFIG_VIDEO_ADV_DEBUG
module_param_named(debug, gspca_debug, int, 0644);
MODULE_PARM_DESC(debug,
"Debug (bit) 0x01:error 0x02:probe 0x04:config"
" 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
" 0x0100: v4l2");
#endif