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nest-open-source / nest-guard / 1.0 / linux / 6754b876e4c89285b30ff59800d23e21ce2dbe3f / . / linux / drivers / media / video / gspca / gspca.c
blob: 8fe8fb486d627d0b41ad1dc51603b0b26b265da6 [file] [log] [blame]
/*
* Main USB camera driver
*
* Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
*
* Camera button input handling by Márton Németh
* Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
*
* 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/version.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/ktime.h>
#include <media/v4l2-ioctl.h>
#include "gspca.h"
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
#include <linux/input.h>
#include <linux/usb/input.h>
#endif
/* global values */
#define DEF_NURBS 3 /* default number of URBs */
#if DEF_NURBS > MAX_NURBS
#error "DEF_NURBS too big"
#endif
MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
MODULE_DESCRIPTION("GSPCA USB Camera Driver");
MODULE_LICENSE("GPL");
#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 10, 0)
#ifdef GSPCA_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 be 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 const struct vm_operations_struct gspca_vm_ops = {
.open = gspca_vm_open,
.close = gspca_vm_close,
};
/*
* Input and interrupt endpoint handling functions
*/
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
static void int_irq(struct urb *urb)
{
struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
int ret;
ret = urb->status;
switch (ret) {
case 0:
if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
urb->transfer_buffer, urb->actual_length) < 0) {
PDEBUG(D_ERR, "Unknown packet received");
}
break;
case -ENOENT:
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
/* Stop is requested either by software or hardware is gone,
* keep the ret value non-zero and don't resubmit later.
*/
break;
default:
PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
urb->status = 0;
ret = 0;
}
if (ret == 0) {
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret < 0)
err("Resubmit URB failed with error %i", ret);
}
}
static int gspca_input_connect(struct gspca_dev *dev)
{
struct input_dev *input_dev;
int err = 0;
dev->input_dev = NULL;
if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
strlcat(dev->phys, "/input0", sizeof(dev->phys));
input_dev->name = dev->sd_desc->name;
input_dev->phys = dev->phys;
usb_to_input_id(dev->dev, &input_dev->id);
input_dev->evbit[0] = BIT_MASK(EV_KEY);
input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
input_dev->dev.parent = &dev->dev->dev;
err = input_register_device(input_dev);
if (err) {
err("Input device registration failed with error %i",
err);
input_dev->dev.parent = NULL;
input_free_device(input_dev);
} else {
dev->input_dev = input_dev;
}
}
return err;
}
static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
struct usb_endpoint_descriptor *ep)
{
unsigned int buffer_len;
int interval;
struct urb *urb;
struct usb_device *dev;
void *buffer = NULL;
int ret = -EINVAL;
buffer_len = le16_to_cpu(ep->wMaxPacketSize);
interval = ep->bInterval;
PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
"buffer_len=%u, interval=%u",
ep->bEndpointAddress, buffer_len, interval);
dev = gspca_dev->dev;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
ret = -ENOMEM;
goto error;
}
buffer = usb_alloc_coherent(dev, buffer_len,
GFP_KERNEL, &urb->transfer_dma);
if (!buffer) {
ret = -ENOMEM;
goto error_buffer;
}
usb_fill_int_urb(urb, dev,
usb_rcvintpipe(dev, ep->bEndpointAddress),
buffer, buffer_len,
int_irq, (void *)gspca_dev, interval);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
gspca_dev->int_urb = urb;
ret = usb_submit_urb(urb, GFP_KERNEL);
if (ret < 0) {
PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
goto error_submit;
}
return ret;
error_submit:
usb_free_coherent(dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
error_buffer:
usb_free_urb(urb);
error:
return ret;
}
static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
{
struct usb_interface *intf;
struct usb_host_interface *intf_desc;
struct usb_endpoint_descriptor *ep;
int i;
if (gspca_dev->sd_desc->int_pkt_scan) {
intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
intf_desc = intf->cur_altsetting;
for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
ep = &intf_desc->endpoint[i].desc;
if (usb_endpoint_dir_in(ep) &&
usb_endpoint_xfer_int(ep)) {
alloc_and_submit_int_urb(gspca_dev, ep);
break;
}
}
}
}
static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
{
struct urb *urb;
urb = gspca_dev->int_urb;
if (urb) {
gspca_dev->int_urb = NULL;
usb_kill_urb(urb);
usb_free_coherent(gspca_dev->dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
usb_free_urb(urb);
}
}
#else
static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
{
}
static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
{
}
static inline int gspca_input_connect(struct gspca_dev *dev)
{
return 0;
}
#endif
/*
* fill a video frame from an URB and resubmit
*/
static void fill_frame(struct gspca_dev *gspca_dev,
struct urb *urb)
{
u8 *data; /* address of data in the iso message */
int i, len, st;
cam_pkt_op pkt_scan;
if (urb->status != 0) {
if (urb->status == -ESHUTDOWN)
return; /* disconnection */
#ifdef CONFIG_PM
if (gspca_dev->frozen)
return;
#endif
PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
urb->status = 0;
goto resubmit;
}
pkt_scan = gspca_dev->sd_desc->pkt_scan;
for (i = 0; i < urb->number_of_packets; i++) {
/* check the packet status and length */
len = urb->iso_frame_desc[i].actual_length;
if (len == 0) {
if (gspca_dev->empty_packet == 0)
gspca_dev->empty_packet = 1;
continue;
}
st = urb->iso_frame_desc[i].status;
if (st) {
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, data, len);
}
resubmit:
/* resubmit the URB */
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
err("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");
if (!gspca_dev->streaming)
return;
fill_frame(gspca_dev, urb);
}
/*
* bulk message interrupt from the USB device
*/
static void bulk_irq(struct urb *urb)
{
struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
int st;
PDEBUG(D_PACK, "bulk irq");
if (!gspca_dev->streaming)
return;
switch (urb->status) {
case 0:
break;
case -ESHUTDOWN:
return; /* disconnection */
default:
#ifdef CONFIG_PM
if (gspca_dev->frozen)
return;
#endif
PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
urb->status = 0;
goto resubmit;
}
PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
gspca_dev->sd_desc->pkt_scan(gspca_dev,
urb->transfer_buffer,
urb->actual_length);
resubmit:
/* resubmit the URB */
if (gspca_dev->cam.bulk_nurbs != 0) {
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
err("usb_submit_urb() ret %d", st);
}
}
/*
* 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.
*/
void gspca_frame_add(struct gspca_dev *gspca_dev,
enum gspca_packet_type packet_type,
const u8 *data,
int len)
{
struct gspca_frame *frame;
int i, j;
PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
if (packet_type == FIRST_PACKET) {
i = atomic_read(&gspca_dev->fr_i);
/* if there are no queued buffer, discard the whole frame */
if (i == atomic_read(&gspca_dev->fr_q)) {
gspca_dev->last_packet_type = DISCARD_PACKET;
gspca_dev->sequence++;
return;
}
j = gspca_dev->fr_queue[i];
frame = &gspca_dev->frame[j];
frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
frame->v4l2_buf.sequence = gspca_dev->sequence++;
gspca_dev->image = frame->data;
gspca_dev->image_len = 0;
} else {
switch (gspca_dev->last_packet_type) {
case DISCARD_PACKET:
if (packet_type == LAST_PACKET)
gspca_dev->last_packet_type = packet_type;
return;
case LAST_PACKET:
return;
}
}
/* append the packet to the frame buffer */
if (len > 0) {
if (gspca_dev->image_len + len > gspca_dev->frsz) {
PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
gspca_dev->image_len + len,
gspca_dev->frsz);
packet_type = DISCARD_PACKET;
} else {
/* !! image is NULL only when last pkt is LAST or DISCARD
if (gspca_dev->image == NULL) {
err("gspca_frame_add() image == NULL");
return;
}
*/
memcpy(gspca_dev->image + gspca_dev->image_len,
data, len);
gspca_dev->image_len += len;
}
}
gspca_dev->last_packet_type = packet_type;
/* if last packet, invalidate packet concatenation until
* next first packet, wake up the application and advance
* in the queue */
if (packet_type == LAST_PACKET) {
i = atomic_read(&gspca_dev->fr_i);
j = gspca_dev->fr_queue[i];
frame = &gspca_dev->frame[j];
frame->v4l2_buf.bytesused = gspca_dev->image_len;
frame->v4l2_buf.flags = (frame->v4l2_buf.flags
| V4L2_BUF_FLAG_DONE)
& ~V4L2_BUF_FLAG_QUEUED;
i = (i + 1) % GSPCA_MAX_FRAMES;
atomic_set(&gspca_dev->fr_i, i);
wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
PDEBUG(D_FRAM, "frame complete len:%d",
frame->v4l2_buf.bytesused);
gspca_dev->image = NULL;
gspca_dev->image_len = 0;
}
}
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:
case V4L2_PIX_FMT_MR97310A:
return 1;
}
return 0;
}
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 - 1;
gspca_dev->frbuf = vmalloc_32(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 = gspca_dev->frbuf + i * frsz;
frame->v4l2_buf.m.offset = i * frsz;
}
atomic_set(&gspca_dev->fr_q, 0);
atomic_set(&gspca_dev->fr_i, 0);
gspca_dev->fr_o = 0;
return 0;
}
static void frame_free(struct gspca_dev *gspca_dev)
{
int i;
PDEBUG(D_STREAM, "frame free");
if (gspca_dev->frbuf != NULL) {
vfree(gspca_dev->frbuf);
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_free_coherent(gspca_dev->dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
usb_free_urb(urb);
}
}
static int gspca_set_alt0(struct gspca_dev *gspca_dev)
{
int ret;
if (gspca_dev->alt == 0)
return 0;
ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
if (ret < 0)
err("set alt 0 err %d", ret);
return ret;
}
/* Note: both the queue and the usb locks should be held when calling this */
static void gspca_stream_off(struct gspca_dev *gspca_dev)
{
gspca_dev->streaming = 0;
if (gspca_dev->present) {
if (gspca_dev->sd_desc->stopN)
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
gspca_input_destroy_urb(gspca_dev);
gspca_set_alt0(gspca_dev);
gspca_input_create_urb(gspca_dev);
}
/* always call stop0 to free the subdriver's resources */
if (gspca_dev->sd_desc->stop0)
gspca_dev->sd_desc->stop0(gspca_dev);
PDEBUG(D_STREAM, "stream off OK");
}
/*
* look for an input transfer endpoint in an alternate setting
*/
static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
int xfer)
{
struct usb_host_endpoint *ep;
int i, attr;
for (i = 0; i < alt->desc.bNumEndpoints; i++) {
ep = &alt->endpoint[i];
attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
if (attr == xfer
&& ep->desc.wMaxPacketSize != 0)
return ep;
}
return NULL;
}
/*
* look for an input (isoc or bulk) 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).
*/
static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
{
struct usb_interface *intf;
struct usb_host_endpoint *ep;
int xfer, i, ret;
intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
ep = NULL;
xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
: USB_ENDPOINT_XFER_ISOC;
i = gspca_dev->alt; /* previous alt setting */
if (gspca_dev->cam.reverse_alts) {
if (gspca_dev->audio && i < gspca_dev->nbalt - 2)
i++;
while (++i < gspca_dev->nbalt) {
ep = alt_xfer(&intf->altsetting[i], xfer);
if (ep)
break;
}
} else {
if (gspca_dev->audio && i > 1)
i--;
while (--i >= 0) {
ep = alt_xfer(&intf->altsetting[i], xfer);
if (ep)
break;
}
}
if (ep == NULL) {
err("no transfer endpoint found");
return NULL;
}
PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
i, ep->desc.bEndpointAddress);
gspca_dev->alt = i; /* memorize the current alt setting */
if (gspca_dev->nbalt > 1) {
gspca_input_destroy_urb(gspca_dev);
ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
if (ret < 0) {
err("set alt %d err %d", i, ret);
ep = NULL;
}
gspca_input_create_urb(gspca_dev);
}
return ep;
}
/*
* create the URBs for image transfer
*/
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);
if (!gspca_dev->cam.bulk) { /* isoc */
/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
if (gspca_dev->pkt_size == 0)
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
else
psize = gspca_dev->pkt_size;
npkt = gspca_dev->cam.npkt;
if (npkt == 0)
npkt = 32; /* default value */
bsize = psize * npkt;
PDEBUG(D_STREAM,
"isoc %d pkts size %d = bsize:%d",
npkt, psize, bsize);
nurbs = DEF_NURBS;
} else { /* bulk */
npkt = 0;
bsize = gspca_dev->cam.bulk_size;
if (bsize == 0)
bsize = psize;
PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
if (gspca_dev->cam.bulk_nurbs != 0)
nurbs = gspca_dev->cam.bulk_nurbs;
else
nurbs = 1;
}
for (n = 0; n < nurbs; n++) {
urb = usb_alloc_urb(npkt, GFP_KERNEL);
if (!urb) {
err("usb_alloc_urb failed");
return -ENOMEM;
}
gspca_dev->urb[n] = urb;
urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
bsize,
GFP_KERNEL,
&urb->transfer_dma);
if (urb->transfer_buffer == NULL) {
err("usb_alloc_coherent failed");
return -ENOMEM;
}
urb->dev = gspca_dev->dev;
urb->context = gspca_dev;
urb->transfer_buffer_length = bsize;
if (npkt != 0) { /* ISOC */
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;
for (i = 0; i < npkt; i++) {
urb->iso_frame_desc[i].length = psize;
urb->iso_frame_desc[i].offset = psize * i;
}
} else { /* bulk */
urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
ep->desc.bEndpointAddress),
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
urb->complete = bulk_irq;
}
}
return 0;
}
/*
* start the USB transfer
*/
static int gspca_init_transfer(struct gspca_dev *gspca_dev)
{
struct usb_host_endpoint *ep;
struct urb *urb;
int n, ret;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
/* reset the streaming variables */
gspca_dev->image = NULL;
gspca_dev->image_len = 0;
gspca_dev->last_packet_type = DISCARD_PACKET;
gspca_dev->sequence = 0;
gspca_dev->usb_err = 0;
/* set the higher alternate setting and
* loop until urb submit succeeds */
if (gspca_dev->cam.reverse_alts)
gspca_dev->alt = 0;
else
gspca_dev->alt = gspca_dev->nbalt;
if (gspca_dev->sd_desc->isoc_init) {
ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
if (ret < 0)
goto out;
}
ep = get_ep(gspca_dev);
if (ep == NULL) {
ret = -EIO;
goto out;
}
for (;;) {
if (!gspca_dev->cam.no_urb_create) {
PDEBUG(D_STREAM, "init transfer alt %d",
gspca_dev->alt);
ret = create_urbs(gspca_dev, ep);
if (ret < 0) {
destroy_urbs(gspca_dev);
goto out;
}
}
/* clear the bulk endpoint */
if (gspca_dev->cam.bulk)
usb_clear_halt(gspca_dev->dev,
gspca_dev->urb[0]->pipe);
/* start the cam */
ret = gspca_dev->sd_desc->start(gspca_dev);
if (ret < 0) {
destroy_urbs(gspca_dev);
goto out;
}
gspca_dev->streaming = 1;
/* some bulk transfers are started by the subdriver */
if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
break;
/* submit the URBs */
for (n = 0; n < MAX_NURBS; n++) {
urb = gspca_dev->urb[n];
if (urb == NULL)
break;
ret = usb_submit_urb(urb, GFP_KERNEL);
if (ret < 0)
break;
}
if (ret >= 0)
break;
gspca_stream_off(gspca_dev);
if (ret != -ENOSPC) {
err("usb_submit_urb alt %d err %d",
gspca_dev->alt, ret);
goto out;
}
/* the bandwidth is not wide enough
* negociate or try a lower alternate setting */
PDEBUG(D_ERR|D_STREAM,
"bandwidth not wide enough - trying again");
msleep(20); /* wait for kill complete */
if (gspca_dev->sd_desc->isoc_nego) {
ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
if (ret < 0)
goto out;
} else {
ep = get_ep(gspca_dev);
if (ep == NULL) {
ret = -EIO;
goto out;
}
}
}
out:
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
{
struct gspca_ctrl *ctrl;
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;
/* set the current control values to their default values
* which may have changed in sd_init() */
ctrl = gspca_dev->cam.ctrls;
if (ctrl != NULL) {
for (i = 0;
i < gspca_dev->sd_desc->nctrls;
i++, ctrl++)
ctrl->val = ctrl->def;
}
}
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;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_register(struct file *file, void *priv,
struct v4l2_dbg_register *reg)
{
int ret;
struct gspca_dev *gspca_dev = priv;
if (!gspca_dev->sd_desc->get_chip_ident)
return -EINVAL;
if (!gspca_dev->sd_desc->get_register)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static int vidioc_s_register(struct file *file, void *priv,
struct v4l2_dbg_register *reg)
{
int ret;
struct gspca_dev *gspca_dev = priv;
if (!gspca_dev->sd_desc->get_chip_ident)
return -EINVAL;
if (!gspca_dev->sd_desc->set_register)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
#endif
static int vidioc_g_chip_ident(struct file *file, void *priv,
struct v4l2_dbg_chip_ident *chip)
{
int ret;
struct gspca_dev *gspca_dev = priv;
if (!gspca_dev->sd_desc->get_chip_ident)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
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 >= ARRAY_SIZE(fmt_tb))
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->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;
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;
w = fmt->fmt.pix.width;
h = fmt->fmt.pix.height;
#ifdef GSPCA_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 vidioc_enum_framesizes(struct file *file, void *priv,
struct v4l2_frmsizeenum *fsize)
{
struct gspca_dev *gspca_dev = priv;
int i;
__u32 index = 0;
for (i = 0; i < gspca_dev->cam.nmodes; i++) {
if (fsize->pixel_format !=
gspca_dev->cam.cam_mode[i].pixelformat)
continue;
if (fsize->index == index) {
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fsize->discrete.width =
gspca_dev->cam.cam_mode[i].width;
fsize->discrete.height =
gspca_dev->cam.cam_mode[i].height;
return 0;
}
index++;
}
return -EINVAL;
}
static int vidioc_enum_frameintervals(struct file *filp, void *priv,
struct v4l2_frmivalenum *fival)
{
struct gspca_dev *gspca_dev = priv;
int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
__u32 i;
if (gspca_dev->cam.mode_framerates == NULL ||
gspca_dev->cam.mode_framerates[mode].nrates == 0)
return -EINVAL;
if (fival->pixel_format !=
gspca_dev->cam.cam_mode[mode].pixelformat)
return -EINVAL;
for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
if (fival->index == i) {
fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fival->discrete.numerator = 1;
fival->discrete.denominator =
gspca_dev->cam.mode_framerates[mode].rates[i];
return 0;
}
}
return -EINVAL;
}
static void gspca_release(struct video_device *vfd)
{
struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
PDEBUG(D_PROBE, "%s released",
video_device_node_name(&gspca_dev->vdev));
kfree(gspca_dev->usb_buf);
kfree(gspca_dev);
}
static int dev_open(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 (gspca_dev->users > 4) { /* (arbitrary value) */
ret = -EBUSY;
goto out;
}
/* protect the subdriver against rmmod */
if (!try_module_get(gspca_dev->module)) {
ret = -ENODEV;
goto out;
}
gspca_dev->users++;
file->private_data = gspca_dev;
#ifdef GSPCA_DEBUG
/* activate the v4l2 debug */
if (gspca_debug & D_V4L2)
gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
| V4L2_DEBUG_IOCTL_ARG;
else
gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
| V4L2_DEBUG_IOCTL_ARG);
#endif
ret = 0;
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 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) {
if (gspca_dev->streaming) {
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->usb_err = 0;
gspca_stream_off(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;
module_put(gspca_dev->module);
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;
int ret;
/* protect the access to the usb device */
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
if (gspca_dev->dev->product != NULL) {
strncpy(cap->card, gspca_dev->dev->product,
sizeof cap->card);
} else {
snprintf(cap->card, sizeof cap->card,
"USB Camera (%04x:%04x)",
le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
}
usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
cap->version = DRIVER_VERSION_NUMBER;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_STREAMING
| V4L2_CAP_READWRITE;
ret = 0;
out:
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static int get_ctrl(struct gspca_dev *gspca_dev,
int id)
{
const struct ctrl *ctrls;
int i;
for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
i < gspca_dev->sd_desc->nctrls;
i++, ctrls++) {
if (gspca_dev->ctrl_dis & (1 << i))
continue;
if (id == ctrls->qctrl.id)
return i;
}
return -1;
}
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *q_ctrl)
{
struct gspca_dev *gspca_dev = priv;
const struct ctrl *ctrls;
struct gspca_ctrl *gspca_ctrl;
int i, idx;
u32 id;
id = q_ctrl->id;
if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
id &= V4L2_CTRL_ID_MASK;
id++;
idx = -1;
for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
if (gspca_dev->ctrl_dis & (1 << i))
continue;
if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
continue;
if (idx >= 0
&& gspca_dev->sd_desc->ctrls[i].qctrl.id
> gspca_dev->sd_desc->ctrls[idx].qctrl.id)
continue;
idx = i;
}
} else {
idx = get_ctrl(gspca_dev, id);
}
if (idx < 0)
return -EINVAL;
ctrls = &gspca_dev->sd_desc->ctrls[idx];
memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
if (gspca_dev->cam.ctrls != NULL) {
gspca_ctrl = &gspca_dev->cam.ctrls[idx];
q_ctrl->default_value = gspca_ctrl->def;
q_ctrl->minimum = gspca_ctrl->min;
q_ctrl->maximum = gspca_ctrl->max;
}
if (gspca_dev->ctrl_inac & (1 << idx))
q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
return 0;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct gspca_dev *gspca_dev = priv;
const struct ctrl *ctrls;
struct gspca_ctrl *gspca_ctrl;
int idx, ret;
idx = get_ctrl(gspca_dev, ctrl->id);
if (idx < 0)
return -EINVAL;
if (gspca_dev->ctrl_inac & (1 << idx))
return -EINVAL;
ctrls = &gspca_dev->sd_desc->ctrls[idx];
if (gspca_dev->cam.ctrls != NULL) {
gspca_ctrl = &gspca_dev->cam.ctrls[idx];
if (ctrl->value < gspca_ctrl->min
|| ctrl->value > gspca_ctrl->max)
return -ERANGE;
} else {
gspca_ctrl = NULL;
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;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
gspca_dev->usb_err = 0;
if (ctrls->set != NULL) {
ret = ctrls->set(gspca_dev, ctrl->value);
goto out;
}
if (gspca_ctrl != NULL) {
gspca_ctrl->val = ctrl->value;
if (ctrls->set_control != NULL
&& gspca_dev->streaming)
ctrls->set_control(gspca_dev);
}
ret = gspca_dev->usb_err;
out:
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
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 idx, ret;
idx = get_ctrl(gspca_dev, ctrl->id);
if (idx < 0)
return -EINVAL;
ctrls = &gspca_dev->sd_desc->ctrls[idx];
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
gspca_dev->usb_err = 0;
if (ctrls->get != NULL) {
ret = ctrls->get(gspca_dev, &ctrl->value);
goto out;
}
if (gspca_dev->cam.ctrls != NULL)
ctrl->value = gspca_dev->cam.ctrls[idx].val;
ret = 0;
out:
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
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;
input->type = V4L2_INPUT_TYPE_CAMERA;
input->status = gspca_dev->cam.input_flags;
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, streaming;
i = rb->memory; /* (avoid compilation warning) */
switch (i) {
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 */
streaming = gspca_dev->streaming;
if (streaming) {
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->usb_err = 0;
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;
if (streaming)
ret = gspca_init_transfer(gspca_dev);
}
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->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;
/* check the capture file */
if (gspca_dev->capt_file != file) {
ret = -EBUSY;
goto out;
}
if (gspca_dev->nframes == 0
|| !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
ret = -EINVAL;
goto out;
}
if (!gspca_dev->streaming) {
ret = gspca_init_transfer(gspca_dev);
if (ret < 0)
goto out;
}
#ifdef GSPCA_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 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;
/* check the capture file */
if (gspca_dev->capt_file != file) {
ret = -EBUSY;
goto out;
}
/* stop streaming */
if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
ret = -ERESTARTSYS;
goto out;
}
gspca_dev->usb_err = 0;
gspca_stream_off(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
/* empty the transfer queues */
atomic_set(&gspca_dev->fr_q, 0);
atomic_set(&gspca_dev->fr_i, 0);
gspca_dev->fr_o = 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;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
else
ret = -ENODEV;
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 (!gspca_dev->sd_desc->set_jcomp)
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
else
ret = -ENODEV;
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;
parm->parm.capture.readbuffers = gspca_dev->nbufread;
if (gspca_dev->sd_desc->get_streamparm) {
int ret;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
parm);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
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;
if (gspca_dev->sd_desc->set_streamparm) {
int ret;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
gspca_dev->usb_err = 0;
if (gspca_dev->present)
ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
parm);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
return 0;
}
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;
}
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)
{
int i, ret;
/* check if a frame is ready */
i = gspca_dev->fr_o;
if (i == atomic_read(&gspca_dev->fr_i)) {
if (nonblock_ing)
return -EAGAIN;
/* wait till a frame is ready */
ret = wait_event_interruptible_timeout(gspca_dev->wq,
i != atomic_read(&gspca_dev->fr_i) ||
!gspca_dev->streaming || !gspca_dev->present,
msecs_to_jiffies(3000));
if (ret < 0)
return ret;
if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
return -EIO;
}
gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
if (gspca_dev->sd_desc->dq_callback) {
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->usb_err = 0;
if (gspca_dev->present)
gspca_dev->sd_desc->dq_callback(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
}
return gspca_dev->fr_queue[i];
}
/*
* 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->memory != gspca_dev->memory)
return -EINVAL;
if (!gspca_dev->present)
return -ENODEV;
/* 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 __user *) 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 (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;
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 = atomic_read(&gspca_dev->fr_q);
gspca_dev->fr_queue[i] = index;
atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
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 ret;
PDEBUG(D_FRAM, "poll");
poll_wait(file, &gspca_dev->wq, wait);
/* 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;
/* check if an image has been received */
if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
ret = POLLIN | POLLRDNORM; /* yes */
else
ret = 0;
mutex_unlock(&gspca_dev->queue_lock);
if (!gspca_dev->present)
return POLLHUP;
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 */
timestamp = ktime_to_timeval(ktime_get());
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 a newer 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 struct v4l2_file_operations dev_fops = {
.owner = THIS_MODULE,
.open = dev_open,
.release = dev_close,
.read = dev_read,
.mmap = dev_mmap,
.unlocked_ioctl = video_ioctl2,
.poll = dev_poll,
};
static const struct v4l2_ioctl_ops dev_ioctl_ops = {
.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_enum_framesizes = vidioc_enum_framesizes,
.vidioc_enum_frameintervals = vidioc_enum_frameintervals,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_register = vidioc_g_register,
.vidioc_s_register = vidioc_s_register,
#endif
.vidioc_g_chip_ident = vidioc_g_chip_ident,
};
static struct video_device gspca_template = {
.name = "gspca main driver",
.fops = &dev_fops,
.ioctl_ops = &dev_ioctl_ops,
.release = gspca_release,
};
/* initialize the controls */
static void ctrls_init(struct gspca_dev *gspca_dev)
{
struct gspca_ctrl *ctrl;
int i;
for (i = 0, ctrl = gspca_dev->cam.ctrls;
i < gspca_dev->sd_desc->nctrls;
i++, ctrl++) {
ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
ctrl->val = ctrl->def;
ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
}
}
/*
* 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_probe2(struct usb_interface *intf,
const struct usb_device_id *id,
const struct sd_desc *sd_desc,
int dev_size,
struct module *module)
{
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);
/* create the device */
if (dev_size < sizeof *gspca_dev)
dev_size = sizeof *gspca_dev;
gspca_dev = kzalloc(dev_size, GFP_KERNEL);
if (!gspca_dev) {
err("couldn't kzalloc gspca struct");
return -ENOMEM;
}
gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
if (!gspca_dev->usb_buf) {
err("out of memory");
ret = -ENOMEM;
goto out;
}
gspca_dev->dev = dev;
gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
gspca_dev->nbalt = intf->num_altsetting;
/* check if any audio device */
if (dev->config->desc.bNumInterfaces != 1) {
int i;
struct usb_interface *intf2;
for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
intf2 = dev->config->interface[i];
if (intf2 != NULL
&& intf2->altsetting != NULL
&& intf2->altsetting->desc.bInterfaceClass ==
USB_CLASS_AUDIO) {
gspca_dev->audio = 1;
break;
}
}
}
gspca_dev->sd_desc = sd_desc;
gspca_dev->nbufread = 2;
gspca_dev->empty_packet = -1; /* don't check the empty packets */
/* configure the subdriver and initialize the USB device */
ret = sd_desc->config(gspca_dev, id);
if (ret < 0)
goto out;
if (gspca_dev->cam.ctrls != NULL)
ctrls_init(gspca_dev);
ret = sd_desc->init(gspca_dev);
if (ret < 0)
goto out;
gspca_set_default_mode(gspca_dev);
ret = gspca_input_connect(gspca_dev);
if (ret)
goto out;
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.parent = &intf->dev;
gspca_dev->module = module;
gspca_dev->present = 1;
ret = video_register_device(&gspca_dev->vdev,
VFL_TYPE_GRABBER,
-1);
if (ret < 0) {
err("video_register_device err %d", ret);
goto out;
}
usb_set_intfdata(intf, gspca_dev);
PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
gspca_input_create_urb(gspca_dev);
return 0;
out:
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
if (gspca_dev->input_dev)
input_unregister_device(gspca_dev->input_dev);
#endif
kfree(gspca_dev->usb_buf);
kfree(gspca_dev);
return ret;
}
EXPORT_SYMBOL(gspca_dev_probe2);
/* same function as the previous one, but check the interface */
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_device *dev = interface_to_usbdev(intf);
/* we don't handle multi-config cameras */
if (dev->descriptor.bNumConfigurations != 1) {
err("%04x:%04x too many config",
id->idVendor, id->idProduct);
return -ENODEV;
}
/* the USB video interface must be the first one */
if (dev->config->desc.bNumInterfaces != 1
&& intf->cur_altsetting->desc.bInterfaceNumber != 0)
return -ENODEV;
return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
}
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 defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
struct input_dev *input_dev;
#endif
PDEBUG(D_PROBE, "%s disconnect",
video_device_node_name(&gspca_dev->vdev));
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->present = 0;
if (gspca_dev->streaming) {
destroy_urbs(gspca_dev);
wake_up_interruptible(&gspca_dev->wq);
}
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
gspca_input_destroy_urb(gspca_dev);
input_dev = gspca_dev->input_dev;
if (input_dev) {
gspca_dev->input_dev = NULL;
input_unregister_device(input_dev);
}
#endif
/* the device is freed at exit of this function */
gspca_dev->dev = NULL;
mutex_unlock(&gspca_dev->usb_lock);
usb_set_intfdata(intf, NULL);
/* release the device */
/* (this will call gspca_release() immediatly or on last close) */
video_unregister_device(&gspca_dev->vdev);
/* PDEBUG(D_PROBE, "disconnect complete"); */
}
EXPORT_SYMBOL(gspca_disconnect);
#ifdef CONFIG_PM
int gspca_suspend(struct usb_interface *intf, pm_message_t message)
{
struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
if (!gspca_dev->streaming)
return 0;
gspca_dev->frozen = 1; /* avoid urb error messages */
if (gspca_dev->sd_desc->stopN)
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
gspca_input_destroy_urb(gspca_dev);
gspca_set_alt0(gspca_dev);
if (gspca_dev->sd_desc->stop0)
gspca_dev->sd_desc->stop0(gspca_dev);
return 0;
}
EXPORT_SYMBOL(gspca_suspend);
int gspca_resume(struct usb_interface *intf)
{
struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
gspca_dev->frozen = 0;
gspca_dev->sd_desc->init(gspca_dev);
gspca_input_create_urb(gspca_dev);
if (gspca_dev->streaming)
return gspca_init_transfer(gspca_dev);
return 0;
}
EXPORT_SYMBOL(gspca_resume);
#endif
/* -- 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->ctrl_dis & (1 << i))
continue;
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",
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("v%d.%d.%d registered",
(DRIVER_VERSION_NUMBER >> 16) & 0xff,
(DRIVER_VERSION_NUMBER >> 8) & 0xff,
DRIVER_VERSION_NUMBER & 0xff);
return 0;
}
static void __exit gspca_exit(void)
{
}
module_init(gspca_init);
module_exit(gspca_exit);
#ifdef GSPCA_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