Menu
▾
▴
Re: [Libusb-devel] Trying to implement driver
|
From: Johannes E. <joh...@er...> - 2002-01-06 17:33:42
|
On Sun, Jan 06, 2002, je...@un... <je...@un...> wrote:
> I recently bought a SanDisk USB SmartMedia reader, model SDDR-55, thinking
> it would "just work" under linux with the usb-storage support. Well, it
> doesn't.
>
> So now I'm trying to get some use out of it by writing a libusb+nbd driver
> so that I can eventually use it as a regular block device under Linux. I'm
> using RedHat 7.2's vanilla kernel, and cvs libusb. (gphoto2 sees my camera
> just fine with this kernel and libusb)
>
> I've dumped the interaction between the hardware and Windows using "usb
> snoopy" and then tried to write a program using libusb to establish basic
> communication with the reader. However, my program fails by reaching a
> timeout in the first usb_bulk_write() call.
>
> I wonder whether I'm missing something about the first 3 URBs that I
> haven't directly translated into libusb calls. The effect of those
> URBs seemed to be to open the device, and set configuration/interfaces,
> and I have code to do so...
Here, I'll annotate the log the best I can (not too familiar with USB
snoopy).
> I've attached the code in the hopes that somebody can take a look at it and
> quickly see what I've done incorrectly or completely failed to do.
>
> This is the start of the usbsnoopy log, incluing the first 5 URBs (all that
> my program attempts to reproduce):
> >>>>>>> URB 1 going down...
> -- URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE:
> TransferBufferLength = 00000012
> TransferBuffer = c1ab2630
> TransferBufferMDL = 00000000
> Index = 00
> DescriptorType = 01 (USB_DEVICE_DESCRIPTOR_TYPE)
> LanguageId = 0000
>
> <<<<<<< URB 1 coming back...
> -- URB_FUNCTION_CONTROL_TRANSFER:
> PipeHandle = c1ac2a7c
> TransferFlags = 00000003 (USBD_TRANSFER_DIRECTION_IN, USBD_SHORT_TRANSFER_OK)
> TransferBufferLength = 00000012
> TransferBuffer = c1ab2630
> TransferBufferMDL = c1a9d6d0
>
> 0000:
> 12 01 10 01 ff 00 00 08 aa 55 03 a1 01 01 01 02 .........U......
> 0010:
> 03 01 ..
> UrbLink = 00000000
> SetupPacket : 80 06 00 01 00 00 12 00
> UsbSnoop - IRP_MJ_INTERNAL_DEVICE_CONTROL, IOCTL_INTERNAL_USB_SUBMIT_URB
This looks like Windows doing the first part of the enumeration.
> >>>>>>> URB 2 going down...
> -- URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE:
> TransferBufferLength = 00000209
> TransferBuffer = c1abf060
> TransferBufferMDL = 00000000
> Index = 00
> DescriptorType = 02 (USB_CONFIGURATION_DESCRIPTOR_TYPE)
> LanguageId = 0000
>
> <<<<<<< URB 2 coming back...
> -- URB_FUNCTION_CONTROL_TRANSFER:
> PipeHandle = c1ac2a7c
> TransferFlags = 00000003 (USBD_TRANSFER_DIRECTION_IN, USBD_SHORT_TRANSFER_OK)
> TransferBufferLength = 00000020
> TransferBuffer = c1abf060
> TransferBufferMDL = c1a9d6d0
>
> 0000:
> 09 02 20 00 01 01 00 80 32 09 04 00 00 02 ff 00 ........2.......
> 0010:
> 00 00 07 05 01 02 40 00 00 07 05 82 02 40 00 00 ......@......@..
> UrbLink = 00000000
> SetupPacket : 80 06 00 02 00 00 09 02
> UsbSnoop - IRP_MJ_INTERNAL_DEVICE_CONTROL, IOCTL_INTERNAL_USB_SUBMIT_URB
This looks like Windows doing the second part of the enumeration.
This is handled by Linux and libusb. You shouldn't need to worry about
this.
> >>>>>>> URB 3 going down...
> -- URB_FUNCTION_SELECT_CONFIGURATION:
> ConfigurationDescriptor = 0xc1abf060 (configure)
> ConfigurationDescriptor : bLength = 0x09
> ConfigurationDescriptor : bDescriptorType = 0x02
> ConfigurationDescriptor : wTotalLength = 0x0020
> ConfigurationDescriptor : bNumInterfaces = 0x01
> ConfigurationDescriptor : bConfigurationValue = 0x01
> ConfigurationDescriptor : iConfiguration = 0x00
> ConfigurationDescriptor : bmAttributes = 0x80
> ConfigurationDescriptor : MaxPower = 0x32
> ConfigurationHandle = 0x00000003
> Interface[0]: Length = 0x00000038
> Interface[0]: InterfaceNumber = 0x00
> Interface[0]: AlternateSetting = 0x00
>
> <<<<<<< URB 3 coming back...
> -- URB_FUNCTION_SELECT_CONFIGURATION:
> ConfigurationDescriptor = 0xc1abf060 (configure)
> ConfigurationDescriptor : bLength = 0x09
> ConfigurationDescriptor : bDescriptorType = 0x02
> ConfigurationDescriptor : wTotalLength = 0x0020
> ConfigurationDescriptor : bNumInterfaces = 0x01
> ConfigurationDescriptor : bConfigurationValue = 0x01
> ConfigurationDescriptor : iConfiguration = 0x00
> ConfigurationDescriptor : bmAttributes = 0x80
> ConfigurationDescriptor : MaxPower = 0x32
> ConfigurationHandle = 0xc29aac00
> Interface[0]: Length = 0x00000038
> Interface[0]: InterfaceNumber = 0x00
> Interface[0]: AlternateSetting = 0x00
> Interface[0]: Class = 0xff
> Interface[0]: SubClass = 0x00
> Interface[0]: Protocol = 0x00
> Interface[0]: InterfaceHandle = 0xc1ae2120
> Interface[0]: NumberOfPipes = 0x00000002
> Interface[0]: Pipes[0] : MaximumPacketSize = 0x0040
> Interface[0]: Pipes[0] : EndpointAddress = 0x01
> Interface[0]: Pipes[0] : Interval = 0x00
> Interface[0]: Pipes[0] : PipeType = 0x02 (UsbdPipeTypeBulk)
> Interface[0]: Pipes[0] : PipeHandle = 0xc1ae2138
> Interface[0]: Pipes[0] : MaxTransferSize = 0x00010000
> Interface[0]: Pipes[0] : PipeFlags = 0x00
> Interface[0]: Pipes[1] : MaximumPacketSize = 0x0040
> Interface[0]: Pipes[1] : EndpointAddress = 0x82
> Interface[0]: Pipes[1] : Interval = 0x00
> Interface[0]: Pipes[1] : PipeType = 0x02 (UsbdPipeTypeBulk)
> Interface[0]: Pipes[1] : PipeHandle = 0xc1ae214c
> Interface[0]: Pipes[1] : MaxTransferSize = 0x00010000
> Interface[0]: Pipes[1] : PipeFlags = 0x00
> UsbSnoop - IRP_MJ_PNP (IRP_MN_QUERY_CAPABILITIES)
> UsbSnoop - IRP_MJ_PNP (IRP_MN_QUERY_PNP_DEVICE_STATE)
> UsbSnoop - IRP_MJ_INTERNAL_DEVICE_CONTROL, IOCTL_INTERNAL_USB_SUBMIT_URB
This looks like either Windows or the driver selecting the config and
interface/altsetting
Looks like, config 1, interface 0, altsetting 0.
> >>>>>>> URB 4 going down...
> -- URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:
> PipeHandle = c1ae2138
> TransferFlags = 00000002 (USBD_TRANSFER_DIRECTION_OUT, USBD_SHORT_TRANSFER_OK)
> TransferBufferLength = 00000008
> TransferBuffer = c1acdab6
> TransferBufferMDL = 00000000
>
> 0000:
> 00 00 00 00 00 b0 00 80 ........
> UrbLink = 00000000
>
> <<<<<<< URB 4 coming back...
> -- URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:
> PipeHandle = c1ae2138
> TransferFlags = 00000002 (USBD_TRANSFER_DIRECTION_OUT, USBD_SHORT_TRANSFER_OK)
> TransferBufferLength = 00000008
> TransferBuffer = c1acdab6
> TransferBufferMDL = c1a8f9f0
> UrbLink = 00000000
> UsbSnoop - IRP_MJ_INTERNAL_DEVICE_CONTROL, IOCTL_INTERNAL_USB_SUBMIT_URB
Sending 8 bytes.
> >>>>>>> URB 5 going down...
> -- URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:
> PipeHandle = c1ae214c
> TransferFlags = 00000003 (USBD_TRANSFER_DIRECTION_IN, USBD_SHORT_TRANSFER_OK)
> TransferBufferLength = 00000004
> TransferBuffer = c1acdb1d
> TransferBufferMDL = 00000000
> UrbLink = 00000000
>
> <<<<<<< URB 5 coming back...
> -- URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:
> PipeHandle = c1ae214c
> TransferFlags = 00000003 (USBD_TRANSFER_DIRECTION_IN, USBD_SHORT_TRANSFER_OK)
> TransferBufferLength = 00000002
> TransferBuffer = c1acdb1d
> TransferBufferMDL = c1a8f9f0
>
> 0000:
> ff 04 ..
> UrbLink = 00000000
> ------------------------------------------------------------------------
Sending 2 bytes.
> #include <usb.h>
> #include <malloc.h>
> #include <stdio.h>
> #include <string.h>
> #include <errno.h>
>
> struct usb_device *find_device(struct usb_device *d, int vendor, int product) {
> struct usb_device * first;
> if(!d) d = usb_busses->devices;
> first = d;
>
> while(1) {
> if (d->descriptor.idVendor == vendor
> && d->descriptor.idProduct == product)
> return d;
> if (d->next) d = d->next;
> else if (d->bus->next) d = d->bus->next->devices;
> else d = usb_busses->devices;
> if (d == first) break;
> }
> return NULL;
> }
>
> #define VENDOR 0x55aa
> #define PRODUCT 0xa103
>
> int main(void) {
>
> int r, i;
>
> struct usb_dev_handle *h;
> struct usb_device *dev;
> unsigned char buf[0x201];
> usb_init();
> usb_find_busses();
> usb_find_devices();
>
> usb_set_debug(2);
> dev = find_device(NULL, VENDOR, PRODUCT);
>
> if(!dev) {
> printf("not found");
> return 1;
> }
>
> h = usb_open(dev);
>
> if(!h) printf("open failed\n");
>
> r = usb_set_configuration(h, 1);
> if(r<0) return 1;
>
> r = usb_claim_interface(h, 0);
> if(r<0) return 1;
>
> r = usb_set_altinterface(h, 0);
> if(r<0) return 1;
>
> r = usb_bulk_write(h, 0x1, "\x00\x00\x00\x00\x00\xb0\x00\x80", 8, 5000);
> if(r<0) return 1;
>
> r = usb_bulk_read(h, 0x82, buf, 4, 5000);
> if(r==-1) return 1;
>
> for(i=0; i<r; i++) {
> printf("%02x", buf[i]);
> if(i % 16 == 15) printf("\n");
> else printf(" ");
> }
> return 0;
> }
This all looks good, except you try to read 4 instead of 2, but that
shouldn't be a problem.
Do you have the same problem if you don't do the set_configuration and
set_altinterface?
JE
|