diff options
Diffstat (limited to 'common/usb.c')
| -rw-r--r-- | common/usb.c | 50 |
1 files changed, 30 insertions, 20 deletions
diff --git a/common/usb.c b/common/usb.c index be81aaf0b..db65d7db3 100644 --- a/common/usb.c +++ b/common/usb.c @@ -80,7 +80,8 @@ void usb_scan_devices(void); int usb_hub_probe(struct usb_device *dev, int ifnum); void usb_hub_reset(void); - +static int hub_port_reset(struct usb_device *dev, int port, + unsigned short *portstat); /*********************************************************************** * wait_ms @@ -765,20 +766,34 @@ int usb_new_device(struct usb_device *dev) int tmp; unsigned char tmpbuf[USB_BUFSIZ]; - dev->descriptor.bMaxPacketSize0 = 8; /* Start off at 8 bytes */ - dev->maxpacketsize = 0; /* Default to 8 byte max packet size */ - dev->epmaxpacketin [0] = 8; - dev->epmaxpacketout[0] = 8; - /* We still haven't set the Address yet */ addr = dev->devnum; dev->devnum = 0; -#undef NEW_INIT_SEQ -#ifdef NEW_INIT_SEQ +#ifdef CONFIG_LEGACY_USB_INIT_SEQ + /* this is the old and known way of initializing devices, it is + * different than what Windows and Linux are doing. Windows and Linux + * both retrieve 64 bytes while reading the device descriptor + * Several USB stick devices report ERR: CTL_TIMEOUT, caused by an + * invalid header while reading 8 bytes as device descriptor. */ + dev->descriptor.bMaxPacketSize0 = 8; /* Start off at 8 bytes */ + dev->maxpacketsize = 0; /* Default to 8 byte max packet size */ + dev->epmaxpacketin [0] = 8; + dev->epmaxpacketout[0] = 8; + + err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &dev->descriptor, 8); + if (err < 8) { + printf("\n USB device not responding, " \ + "giving up (status=%lX)\n",dev->status); + return 1; + } +#else /* this is a Windows scheme of initialization sequence, with double - * reset of the device. Some equipment is said to work only with such - * init sequence; this patch is based on the work by Alan Stern: + * reset of the device (Linux uses the same sequence, but without double + * reset. This double reset is not considered harmful and matches the + * Windows behaviour) + * Some equipment is said to work only with such init sequence; this + * patch is based on the work by Alan Stern: * http://sourceforge.net/mailarchive/forum.php?thread_id=5729457&forum_id=5398 */ int j; @@ -790,10 +805,13 @@ int usb_new_device(struct usb_device *dev) /* send 64-byte GET-DEVICE-DESCRIPTOR request. Since the descriptor is * only 18 bytes long, this will terminate with a short packet. But if * the maxpacket size is 8 or 16 the device may be waiting to transmit - * some more. */ + * some more, or keeps on retransmitting the 8 byte header. */ desc = (struct usb_device_descriptor *)tmpbuf; - desc->bMaxPacketSize0 = 0; + dev->descriptor.bMaxPacketSize0 = 64; /* Start off at 64 bytes */ + dev->maxpacketsize = 64; /* Default to 64 byte max packet size */ + dev->epmaxpacketin [0] = 64; + dev->epmaxpacketout[0] = 64; for (j = 0; j < 3; ++j) { err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64); if (err < 0) { @@ -824,14 +842,6 @@ int usb_new_device(struct usb_device *dev) return 1; } } -#else - /* and this is the old and known way of initializing devices */ - err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &dev->descriptor, 8); - if (err < 8) { - printf("\n USB device not responding, " \ - "giving up (status=%lX)\n", dev->status); - return 1; - } #endif dev->epmaxpacketin [0] = dev->descriptor.bMaxPacketSize0; |