On Sun, Apr 07, 2002, Dominik Kuhlen <[EMAIL PROTECTED]> wrote:
> Here are some fragments of my (1.try) code:
>
> I used some professional USB sniffer (CATC USBChief) to get an idea what
> the computer says to the camera and vice versa.
> Then I replayed the packets (at least I hope so) to
> achieve the same behaviour.
> As I mentioned the TOC works.
>
> --------- snip -----------
> #define USB_REQ_RESERVED 0x04
> static unsigned char TOC[10*512]; // some buffers
> static unsigned char ThumbNail[5*0x1000]; // Thumbnail buffer
>
> static int sx330z_open(struct inode *inode,struct file *file)
> {
> -snip
> // some ususal checkings
> -snip
> // Don't know what this is for ? some initialization I think
> pipe=usb_rcvctrlpipe(sx330z->dev,0);
> res=usb_control_msg(sx330z->dev,
> pipe,
> USB_REQ_RESERVED, // traveler hack : 0x04???
> USB_DIR_IN | USB_DIR_VENDOR, // 0xc0
> 0x0001,
> 0x0000,
> buf,16,HZ);
You're missing some very important code. Like what does buf point to?
> printk("sx330z : 0x0001 (%d) : (%02x %02x..
> %02x)\n",res,buf[0],buf[1],buf[8]);
>
> // This one works fine
> pipe=usb_rcvctrlpipe(sx330z->dev,0);
> res=usb_control_msg(sx330z->dev,
> pipe,
> USB_REQ_RESERVED, // traveler hack ???
> USB_DIR_IN | USB_DIR_VENDOR, //
> 0x0002, // get TOC size ??
> 0xd000,
> buf,16,HZ);
> TOCSize=(((buf[9]<<8)+buf[8]));
> printk("sx330z : Get TOCsize (%d) ",res);
> printk("sx330z : TOCSize %d \n",TOCSize);
>
>
> // now read the TOC
> res=usb_control_msg(sx330z->dev,
> pipe,
> USB_REQ_RESERVED, // traveler hack ??
> USB_DIR_OUT | USB_DIR_VENDOR,
> 0x0003, // read TOC
> 0xd000,
> &trq,32,HZ);
Where is trq allocated?
> printk("sx330z : ReqTOCPage %d (%d) : (%02x)\n",TOCPage,res,buf[0]);
> res=usb_bulk_msg(sx330z->dev,usb_rcvbulkpipe(sx330z->dev,2),buf,512,&length,2*HZ);
> // Get 16Byte Ack
> res=usb_bulk_msg(sx330z->dev,usb_rcvbulkpipe(sx330z->dev,2),buf,16,&length,2*HZ);
>
> // Next : request ThumbNail
> res=usb_control_msg(sx330z->dev,
> usb_sndctrlpipe(sx330z->dev,0),
> USB_REQ_RESERVED, // traveler hack ?????
> USB_DIR_OUT | USB_DIR_VENDOR,
> 0x0004,
> 0xd000,
> &trq,32,2*HZ);
>
> // res has positive value here (shouldn't be?)
> printk("sx330z : 0x0004 (%d) : \n",res);
>
> //Here my error appears
>
>res=usb_bulk_msg(sx330z->dev,usb_rcvbulkpipe(sx330z->dev,2),ThumbNail,4096,&length,2*HZ);
> printk(KERN_INFO "sx330z : read TN (%d,%d bytes) \n", res,length);
Use kmalloc. Don't use buffers allocated in the bss.
> // get 16 Byte Ack
> res=usb_bulk_msg(sx330z->dev,usb_rcvbulkpipe(sx330z->dev,2),&buf,16,&length,2*HZ);
> printk(KERN_INFO "sx330z : read ack? (%d,%d bytes)\n",res,length);
Why are using &buf here? Don't you mean just buf?
> }
> /* (kernel log file)
> Apr 1 23:30:05 doku kernel: sx330z : read TOC (0,512 bytes) : 00 ... 30
> Apr 1 23:30:05 doku kernel: sx330z : read ack? (0): 16 bytes
> Apr 1 23:30:05 doku kernel: sx330z : 0x0004 (32)
> Apr 1 23:30:05 doku kernel: uhci.c: d400: host system error, PCI problems?
> Apr 1 23:30:09 doku kernel: usb_control/bulk_msg: timeout
> Apr 1 23:30:09 doku kernel: sx330z : read TN (-110,0 bytes)
> */
>
> ------ snip ----------
>
> These calls are made during the "open" fop on character device (180,65)
> !only for testing!
>
> Are the HZ parameters OK ? does it mean 1sec max blocking ?
Yes, The timeout is the number of timer ticks and HZ will mean 1 second.
> the comment before usb_control_msg says, that it will return 0 or a negative
> number, but I get positve numbers. Is this unusual?
>
> How does the libusb work? Are there any howtos?
http://libusb.sourceforge.net/
The documentation up there lacks some detail, but I'm working on that
still.
> My understanding problem is :
> I modprobe the UHCI module plug my camera in the USB
> (Double A Cable <- forbidden according to the USB Spec)
> and the lowlevel driver searches for an appropriate driver, that
> claims the device (interface), but how does the libusb work with
> this ? Does it have some "universal" kernel module that claims any
> device?
Yes, it's usbdevfs (usbfs in newer kernels).
JE
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