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gspca.c
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gspca.c
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/*
* Main USB camera driver
*
* Copyright (C) 2008-2011 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.
*/
/*
* WARNING: THIS IS A PATCHED VERION OF alt_xfer(),
* WICH RETURNS THE SECOND ISOC ENDPOINT, NOT THE FIRST!
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define pinect_VERSION "2.14.0"
#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/ktime.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include "gspca.h"
#include "lt.h"
#if IS_ENABLED(CONFIG_INPUT)
#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
int pinect_debug;
static void PDEBUG_MODE(struct pinect_dev *pinect_dev, int debug, char *txt,
__u32 pixfmt, int w, int h)
{
if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
PDEBUG(debug, "%s %c%c%c%c %dx%d",
txt,
pixfmt & 0xff,
(pixfmt >> 8) & 0xff,
(pixfmt >> 16) & 0xff,
pixfmt >> 24,
w, h);
} else {
PDEBUG(debug, "%s 0x%08x %dx%d",
txt,
pixfmt,
w, h);
}
}
/* specific memory types - !! should be different from V4L2_MEMORY_xxx */
#define pinect_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
#define pinect_MEMORY_READ 7
#define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
/*
* VMA operations.
*/
static void pinect_vm_open(struct vm_area_struct *vma)
{
struct pinect_frame *frame = vma->vm_private_data;
frame->vma_use_count++;
frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
}
static void pinect_vm_close(struct vm_area_struct *vma)
{
struct pinect_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 pinect_vm_ops = {
.open = pinect_vm_open,
.close = pinect_vm_close,
};
/*
* Input and interrupt endpoint handling functions
*/
#if IS_ENABLED(CONFIG_INPUT)
static void int_irq(struct urb *urb)
{
struct pinect_dev *pinect_dev = (struct pinect_dev *) urb->context;
int ret;
ret = urb->status;
switch (ret) {
case 0:
if (pinect_dev->sd_desc->int_pkt_scan(pinect_dev,
urb->transfer_buffer, urb->actual_length) < 0) {
PERR("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:
PERR("URB error %i, resubmitting", urb->status);
urb->status = 0;
ret = 0;
}
if (ret == 0) {
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret < 0)
pr_err("Resubmit URB failed with error %i\n", ret);
}
}
static int pinect_input_connect(struct pinect_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) {
pr_err("Input device registration failed with error %i\n",
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 pinect_dev *pinect_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 = pinect_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 *)pinect_dev, interval);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
ret = usb_submit_urb(urb, GFP_KERNEL);
if (ret < 0) {
PERR("submit int URB failed with error %i", ret);
goto error_submit;
}
pinect_dev->int_urb = urb;
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 pinect_input_create_urb(struct pinect_dev *pinect_dev)
{
struct usb_interface *intf;
struct usb_host_interface *intf_desc;
struct usb_endpoint_descriptor *ep;
int i;
if (pinect_dev->sd_desc->int_pkt_scan) {
intf = usb_ifnum_to_if(pinect_dev->dev, pinect_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(pinect_dev, ep);
break;
}
}
}
}
static void pinect_input_destroy_urb(struct pinect_dev *pinect_dev)
{
struct urb *urb;
urb = pinect_dev->int_urb;
if (urb) {
pinect_dev->int_urb = NULL;
usb_kill_urb(urb);
usb_free_coherent(pinect_dev->dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
usb_free_urb(urb);
}
}
#else
static inline void pinect_input_destroy_urb(struct pinect_dev *pinect_dev)
{
}
static inline void pinect_input_create_urb(struct pinect_dev *pinect_dev)
{
}
static inline int pinect_input_connect(struct pinect_dev *dev)
{
return 0;
}
#endif
/*
* fill a video frame from an URB and resubmit
*/
static void fill_frame(struct pinect_dev *pinect_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 (pinect_dev->frozen)
return;
#endif
PERR("urb status: %d", urb->status);
urb->status = 0;
goto resubmit;
}
pkt_scan = pinect_dev->sd_desc->pkt_scan;
for (i = 0; i < urb->number_of_packets; i++) {
len = urb->iso_frame_desc[i].actual_length;
/* check the packet status and length */
st = urb->iso_frame_desc[i].status;
if (st) {
pr_err("ISOC data error: [%d] len=%d, status=%d\n",
i, len, st);
pinect_dev->last_packet_type = DISCARD_PACKET;
continue;
}
if (len == 0) {
if (pinect_dev->empty_packet == 0)
pinect_dev->empty_packet = 1;
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(pinect_dev, data, len);
}
resubmit:
/* resubmit the URB */
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
pr_err("usb_submit_urb() ret %d\n", 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 pinect_dev *pinect_dev = (struct pinect_dev *) urb->context;
PDEBUG(D_PACK, "isoc irq");
if (!pinect_dev->streaming)
return;
fill_frame(pinect_dev, urb);
}
/*
* bulk message interrupt from the USB device
*/
static void bulk_irq(struct urb *urb)
{
struct pinect_dev *pinect_dev = (struct pinect_dev *) urb->context;
int st;
PDEBUG(D_PACK, "bulk irq");
if (!pinect_dev->streaming)
return;
switch (urb->status) {
case 0:
break;
case -ESHUTDOWN:
return; /* disconnection */
default:
#ifdef CONFIG_PM
if (pinect_dev->frozen)
return;
#endif
PERR("urb status: %d", urb->status);
urb->status = 0;
goto resubmit;
}
PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
pinect_dev->sd_desc->pkt_scan(pinect_dev,
urb->transfer_buffer,
urb->actual_length);
resubmit:
/* resubmit the URB */
if (pinect_dev->cam.bulk_nurbs != 0) {
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
pr_err("usb_submit_urb() ret %d\n", 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.
*/
static void chunk(void *buffer, const u8 *pkt_data, uint32_t pkt_num, int pkt_size)
{
int n;
uint8_t *raw = (uint8_t *) pkt_data;
uint16_t *frame=(uint16_t *)buffer;
if(pkt_num > 219){
raw += (pkt_num-220) * 12;
}else if(pkt_num > 146){
raw += (pkt_num-147) * 12 + 4;
}else if(pkt_num > 73){
raw += (pkt_num-74) * 12 + 8;
}else{
raw += pkt_num * 12;
}
for(n=40;n--;){
frame[0] = depth_lt[(raw[0]<<3) | (raw[1]>>5)];
frame[1] = depth_lt[((raw[2]<<9) | (raw[3]<<1) | (raw[4]>>7) ) & 2047];
frame[2] = depth_lt[((raw[5]<<7) | (raw[6]>>1) ) & 2047];
frame[3] = depth_lt[((raw[8]<<5) | (raw[9]>>3) ) & 2047];
frame[4] = depth_lt[(raw[11]<<3) | (raw[12]>>5)];
frame[5] = depth_lt[((raw[13]<<9) | (raw[14]<<1) | (raw[15]>>7) ) & 2047];
frame[6] = depth_lt[((raw[16]<<7) | (raw[17]>>1) ) & 2047];
frame[7] = depth_lt[((raw[19]<<5) | (raw[20]>>3) ) & 2047];
frame+=8;
raw+=22;
}
}
void pinect_frame_add(struct pinect_dev *pinect_dev,
enum pinect_packet_type packet_type,
const u8 *data,
int len,
uint32_t pkt_num,
int rawlen, int diff)
{
struct pinect_frame *frame;
int i, j;
PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
if (packet_type == FIRST_PACKET) {
i = atomic_read(&pinect_dev->fr_i);
/* if there are no queued buffer, discard the whole frame */
if (i == atomic_read(&pinect_dev->fr_q)) {
pinect_dev->last_packet_type = DISCARD_PACKET;
pinect_dev->sequence++;
return;
}
j = pinect_dev->fr_queue[i];
frame = &pinect_dev->frame[j];
frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
frame->v4l2_buf.sequence = pinect_dev->sequence++;
pinect_dev->image = frame->data;
pinect_dev->image_len = 0;
} else {
switch (pinect_dev->last_packet_type) {
case DISCARD_PACKET:
if (packet_type == LAST_PACKET) {
pinect_dev->last_packet_type = packet_type;
pinect_dev->image = NULL;
pinect_dev->image_len = 0;
}
return;
case LAST_PACKET:
return;
}
}
/* append the packet to the frame buffer */
if (len > 0) {
if (pinect_dev->image_len + len > pinect_dev->frsz) {
PERR("frame overflow %d > %d",
pinect_dev->image_len + len,
pinect_dev->frsz);
packet_type = DISCARD_PACKET;
} else {
/* !! image is NULL only when last pkt is LAST or DISCARD
if (pinect_dev->image == NULL) {
pr_err("pinect_frame_add() image == NULL\n");
return;
}
*/
if(pkt_num != 73 && pkt_num != 146 && diff >= 0){
chunk(pinect_dev->image + diff, data, pkt_num, rawlen);
pinect_dev->image_len = diff+len;
}
}
}
pinect_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(&pinect_dev->fr_i);
j = pinect_dev->fr_queue[i];
frame = &pinect_dev->frame[j];
frame->v4l2_buf.bytesused = 320*240*2;
frame->v4l2_buf.flags = (frame->v4l2_buf.flags
| V4L2_BUF_FLAG_DONE)
& ~V4L2_BUF_FLAG_QUEUED;
i = (i + 1) % pinect_MAX_FRAMES;
atomic_set(&pinect_dev->fr_i, i);
wake_up_interruptible(&pinect_dev->wq); /* event = new frame */
PDEBUG(D_FRAM, "frame complete len:%d",
frame->v4l2_buf.bytesused);
pinect_dev->image = NULL;
pinect_dev->image_len = 0;
}
}
static int frame_alloc(struct pinect_dev *pinect_dev, struct file *file,
enum v4l2_memory memory, unsigned int count)
{
struct pinect_frame *frame;
unsigned int frsz;
int i;
i = pinect_dev->curr_mode;
frsz = pinect_dev->cam.cam_mode[i].sizeimage;
PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
frsz = PAGE_ALIGN(frsz);
if (count >= pinect_MAX_FRAMES)
count = pinect_MAX_FRAMES - 1;
pinect_dev->frbuf = vmalloc_32(frsz * count);
if (!pinect_dev->frbuf) {
pr_err("frame alloc failed\n");
return -ENOMEM;
}
pinect_dev->capt_file = file;
pinect_dev->memory = memory;
pinect_dev->frsz = frsz;
pinect_dev->nframes = count;
for (i = 0; i < count; i++) {
frame = &pinect_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 = memory;
frame->v4l2_buf.sequence = 0;
frame->data = pinect_dev->frbuf + i * frsz;
frame->v4l2_buf.m.offset = i * frsz;
}
atomic_set(&pinect_dev->fr_q, 0);
atomic_set(&pinect_dev->fr_i, 0);
pinect_dev->fr_o = 0;
return 0;
}
static void frame_free(struct pinect_dev *pinect_dev)
{
int i;
PDEBUG(D_STREAM, "frame free");
if (pinect_dev->frbuf != NULL) {
vfree(pinect_dev->frbuf);
pinect_dev->frbuf = NULL;
for (i = 0; i < pinect_dev->nframes; i++)
pinect_dev->frame[i].data = NULL;
}
pinect_dev->nframes = 0;
pinect_dev->frsz = 0;
pinect_dev->capt_file = NULL;
pinect_dev->memory = pinect_MEMORY_NO;
}
static void destroy_urbs(struct pinect_dev *pinect_dev)
{
struct urb *urb;
unsigned int i;
PDEBUG(D_STREAM, "kill transfer");
for (i = 0; i < MAX_NURBS; i++) {
urb = pinect_dev->urb[i];
if (urb == NULL)
break;
pinect_dev->urb[i] = NULL;
usb_kill_urb(urb);
usb_free_coherent(pinect_dev->dev,
urb->transfer_buffer_length,
urb->transfer_buffer,
urb->transfer_dma);
usb_free_urb(urb);
}
}
static int pinect_set_alt0(struct pinect_dev *pinect_dev)
{
int ret;
if (pinect_dev->alt == 0)
return 0;
ret = usb_set_interface(pinect_dev->dev, pinect_dev->iface, 0);
if (ret < 0)
pr_err("set alt 0 err %d\n", ret);
return ret;
}
/* Note: both the queue and the usb locks should be held when calling this */
static void pinect_stream_off(struct pinect_dev *pinect_dev)
{
pinect_dev->streaming = 0;
pinect_dev->usb_err = 0;
if (pinect_dev->sd_desc->stopN)
pinect_dev->sd_desc->stopN(pinect_dev);
destroy_urbs(pinect_dev);
pinect_input_destroy_urb(pinect_dev);
pinect_set_alt0(pinect_dev);
pinect_input_create_urb(pinect_dev);
if (pinect_dev->sd_desc->stop0)
pinect_dev->sd_desc->stop0(pinect_dev);
PDEBUG(D_STREAM, "stream off OK");
}
/*
* look for an input transfer endpoint in an alternate setting
* patched to get _only_ the second endpoint
*/
static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
int xfer)
{
struct usb_host_endpoint *ep;
int i, attr, ep_nr;
ep_nr=0;
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
&& usb_endpoint_dir_in(&ep->desc)){
if(ep_nr > 0){
return ep;
}
else
ep_nr++;
}
}
return NULL;
}
/* compute the minimum bandwidth for the current transfer */
static u32 which_bandwidth(struct pinect_dev *pinect_dev)
{
u32 bandwidth;
int i;
/* get the (max) image size */
i = pinect_dev->curr_mode;
bandwidth = pinect_dev->cam.cam_mode[i].sizeimage;
/* if the image is compressed, estimate its mean size */
if (!pinect_dev->cam.needs_full_bandwidth &&
bandwidth < pinect_dev->cam.cam_mode[i].width *
pinect_dev->cam.cam_mode[i].height)
bandwidth = bandwidth * 3 / 8; /* 0.375 */
/* estimate the frame rate */
if (pinect_dev->sd_desc->get_streamparm) {
struct v4l2_streamparm parm;
pinect_dev->sd_desc->get_streamparm(pinect_dev, &parm);
bandwidth *= parm.parm.capture.timeperframe.denominator;
bandwidth /= parm.parm.capture.timeperframe.numerator;
} else {
/* don't hope more than 15 fps with USB 1.1 and
* image resolution >= 640x480 */
if (pinect_dev->width >= 640
&& pinect_dev->dev->speed == USB_SPEED_FULL)
bandwidth *= 15; /* 15 fps */
else
bandwidth *= 30; /* 30 fps */
}
PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
return bandwidth;
}
/* endpoint table */
#define MAX_ALT 16
struct ep_tb_s {
u32 alt;
u32 bandwidth;
};
/*
* build the table of the endpoints
* and compute the minimum bandwidth for the image transfer
*/
static int build_isoc_ep_tb(struct pinect_dev *pinect_dev,
struct usb_interface *intf,
struct ep_tb_s *ep_tb)
{
struct usb_host_endpoint *ep;
int i, j, nbalt, psize, found;
u32 bandwidth, last_bw;
nbalt = intf->num_altsetting;
if (nbalt > MAX_ALT)
nbalt = MAX_ALT; /* fixme: should warn */
/* build the endpoint table */
i = 0;
last_bw = 0;
for (;;) {
ep_tb->bandwidth = 2000 * 2000 * 120;
found = 0;
for (j = 0; j < nbalt; j++) {
ep = alt_xfer(&intf->altsetting[j],
USB_ENDPOINT_XFER_ISOC);
if (ep == NULL)
continue;
if (ep->desc.bInterval == 0) {
pr_err("alt %d iso endp with 0 interval\n", j);
continue;
}
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
bandwidth = psize * 1000;
if (pinect_dev->dev->speed == USB_SPEED_HIGH
|| pinect_dev->dev->speed == USB_SPEED_SUPER)
bandwidth *= 8;
bandwidth /= 1 << (ep->desc.bInterval - 1);
if (bandwidth <= last_bw)
continue;
if (bandwidth < ep_tb->bandwidth) {
ep_tb->bandwidth = bandwidth;
ep_tb->alt = j;
found = 1;
}
}
if (!found)
break;
PDEBUG(D_STREAM, "alt %d bandwidth %d",
ep_tb->alt, ep_tb->bandwidth);
last_bw = ep_tb->bandwidth;
i++;
ep_tb++;
}
/*
* If the camera:
* has a usb audio class interface (a built in usb mic); and
* is a usb 1 full speed device; and
* uses the max full speed iso bandwidth; and
* and has more than 1 alt setting
* then skip the highest alt setting to spare bandwidth for the mic
*/
if (pinect_dev->audio &&
pinect_dev->dev->speed == USB_SPEED_FULL &&
last_bw >= 1000000 &&
i > 1) {
PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
i--;
ep_tb--;
}
/* get the requested bandwidth and start at the highest atlsetting */
bandwidth = which_bandwidth(pinect_dev);
ep_tb--;
while (i > 1) {
ep_tb--;
if (ep_tb->bandwidth < bandwidth)
break;
i--;
}
return i;
}
/*
* create the URBs for image transfer
*/
static int create_urbs(struct pinect_dev *pinect_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 (!pinect_dev->cam.bulk) { /* isoc */
/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
if (pinect_dev->pkt_size == 0)
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
else
psize = pinect_dev->pkt_size;
npkt = pinect_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);
pr_warn("isoc %d pkts size %d = bsize:%d",
npkt, psize, bsize);
nurbs = DEF_NURBS;
} else { /* bulk */
npkt = 0;
bsize = pinect_dev->cam.bulk_size;
if (bsize == 0)
bsize = psize;
PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
if (pinect_dev->cam.bulk_nurbs != 0)
nurbs = pinect_dev->cam.bulk_nurbs;
else
nurbs = 1;
}
for (n = 0; n < nurbs; n++) {
urb = usb_alloc_urb(npkt, GFP_KERNEL);
if (!urb) {
pr_err("usb_alloc_urb failed\n");
return -ENOMEM;
}
pinect_dev->urb[n] = urb;
urb->transfer_buffer = usb_alloc_coherent(pinect_dev->dev,
bsize,
GFP_KERNEL,
&urb->transfer_dma);
if (urb->transfer_buffer == NULL) {
pr_err("usb_alloc_coherent failed\n");
return -ENOMEM;
}
urb->dev = pinect_dev->dev;
urb->context = pinect_dev;
urb->transfer_buffer_length = bsize;
if (npkt != 0) { /* ISOC */
urb->pipe = usb_rcvisocpipe(pinect_dev->dev,
ep->desc.bEndpointAddress);
urb->transfer_flags = URB_ISO_ASAP
| URB_NO_TRANSFER_DMA_MAP;
urb->interval = 1 << (ep->desc.bInterval - 1);
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(pinect_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 pinect_init_transfer(struct pinect_dev *pinect_dev)
{
struct usb_interface *intf;
struct usb_host_endpoint *ep;
struct urb *urb;
struct ep_tb_s ep_tb[MAX_ALT];
int n, ret, xfer, alt, alt_idx;
/* reset the streaming variables */
pinect_dev->image = NULL;
pinect_dev->image_len = 0;
pinect_dev->last_packet_type = DISCARD_PACKET;
pinect_dev->sequence = 0;
pinect_dev->usb_err = 0;
/* do the specific subdriver stuff before endpoint selection */
intf = usb_ifnum_to_if(pinect_dev->dev, pinect_dev->iface);
pinect_dev->alt = pinect_dev->cam.bulk ? intf->num_altsetting : 0;
if (pinect_dev->sd_desc->isoc_init) {
ret = pinect_dev->sd_desc->isoc_init(pinect_dev);
if (ret < 0)
return ret;
}
xfer = pinect_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
: USB_ENDPOINT_XFER_ISOC;
/* if bulk or the subdriver forced an altsetting, get the endpoint */
if (pinect_dev->alt != 0) {
pinect_dev->alt--; /* (previous version compatibility) */
ep = alt_xfer(&intf->altsetting[pinect_dev->alt], xfer);
if (ep == NULL) {
pr_err("bad altsetting %d\n", pinect_dev->alt);
return -EIO;
}
ep_tb[0].alt = pinect_dev->alt;
alt_idx = 1;
} else {
/* else, compute the minimum bandwidth
* and build the endpoint table */
alt_idx = build_isoc_ep_tb(pinect_dev, intf, ep_tb);
if (alt_idx <= 0) {
pr_err("no transfer endpoint found\n");
return -EIO;
}
}
/* set the highest alternate setting and
* loop until urb submit succeeds */
pinect_input_destroy_urb(pinect_dev);
pinect_dev->alt = ep_tb[--alt_idx].alt;
alt = -1;
for (;;) {
if (alt != pinect_dev->alt) {
alt = pinect_dev->alt;
if (intf->num_altsetting > 1) {
ret = usb_set_interface(pinect_dev->dev,
pinect_dev->iface,
alt);
if (ret < 0) {
if (ret == -ENOSPC)
goto retry; /*fixme: ugly*/
pr_err("set alt %d err %d\n", alt, ret);
goto out;
}
}
}
if (!pinect_dev->cam.no_urb_create) {
PDEBUG(D_STREAM, "init transfer alt %d", alt);
ret = create_urbs(pinect_dev,
alt_xfer(&intf->altsetting[alt], xfer));
if (ret < 0) {
destroy_urbs(pinect_dev);
goto out;
}
}
/* clear the bulk endpoint */
if (pinect_dev->cam.bulk)
usb_clear_halt(pinect_dev->dev,
pinect_dev->urb[0]->pipe);
/* start the cam */
ret = pinect_dev->sd_desc->start(pinect_dev);
if (ret < 0) {
destroy_urbs(pinect_dev);
goto out;
}
pinect_dev->streaming = 1;
v4l2_ctrl_handler_setup(pinect_dev->vdev.ctrl_handler);
/* some bulk transfers are started by the subdriver */
if (pinect_dev->cam.bulk && pinect_dev->cam.bulk_nurbs == 0)
break;
/* submit the URBs */
for (n = 0; n < MAX_NURBS; n++) {
urb = pinect_dev->urb[n];
if (urb == NULL)
break;
ret = usb_submit_urb(urb, GFP_KERNEL);
if (ret < 0)
break;
}
if (ret >= 0)
break; /* transfer is started */
/* something when wrong
* stop the webcam and free the transfer resources */
pinect_stream_off(pinect_dev);
if (ret != -ENOSPC) {
pr_err("usb_submit_urb alt %d err %d\n",
pinect_dev->alt, ret);
goto out;
}
/* the bandwidth is not wide enough
* negotiate or try a lower alternate setting */