On Tue, 29 May 2007, Guillaume Dargaud wrote:
> Hello all,
> I just subscribed to the list and since the archive seems to be offline I
> don't know if this has been answered before or if it is innapropriate.
>
> I'm trying to write code on Linux to communicate with a Cypress card. We
> already have code running on windows using a customized version of libusb.
> Running the same libusb on Linux or calling IOCTL directly doesn't work.
>
> Here's a little rundown:
> - I first reused code from loadfx to upload our firmware to the card and
> this seems to run fine.
> - then when I want to start configuring the card and then doing bulk on it,
> it won't work.
>
> [...] device configuration, fxload code, ...
>
> int ret, Config, Interface;
> struct usbdevfs_setinterface interface;
> struct usbdevfs_connectinfo connect={0xDEAD,0xBE};
> struct usbdevfs_getdriver driver;
>
> errno=0;
> Config=1;
> ret = ioctl(fd, USBDEVFS_SETCONFIGURATION, &Config);
> if (ret < 0)
> perror("Error setting Usb config");
> // seems to work
>
> errno=0;
> Interface=0;
> ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &Interface);
> if (ret < 0)
> perror("Error claiming interface");
> // returns "Device or resource busy"
>
> // This is necessary
> interface.interface = Interface;
> interface.altsetting = 1;
> errno=0;
> ret = ioctl(fd, USBDEVFS_SETINTERFACE, &interface);
> if (ret < 0)
> perror("Error setting Usb alternate");
> // returns "Device or resource busy"
>
> errno=0;
> ret = ioctl(fd, USBDEVFS_CONNECTINFO, &connect);
> if (ret < 0) perror("Error getting connect info");
> else printf("Connect info: devnum %d, slow: %x\n",
> connect.devnum, connect.slow);
> // Returns Connect info: devnum 6, slow: 0
>
> errno=0;
> ret = ioctl(fd, USBDEVFS_GETDRIVER, &driver);
> if (ret < 0) perror("Error getting driver info");
> else printf("Driver info: interface: %d, driver: %s\n",
> driver.interface, driver.driver);
> // returns "No data available"
>
> Any attempt at bulk transfer also returns "Device or resource busy"
>
> Checked the user permission on the dev file:
>
> $ ll $(./getdevpath -v 0547 -p 2235)
> -rw-rw-rw- 1 root root 236 May 29 10:48 /proc/bus/usb/001/006
>
> I've tried plenty of things (a C++ library based on libusb fails in the same
> way) and I really don't know what to try next. I have the feeling I've
> overlooked something obvious... Please enlighten me !!!
What do you see in /proc/bus/usb/devices? Maybe the interface is
already claimed by another driver.
Alan Stern
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