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usb-linux: allow "compatible" high speed devices to connect at fullspeed 

Some usb2 highspeed devices, like usb-msd devices, work fine when redirected
to a usb1 virtual controller. Allow this to avoid the new speedhecks causing
regressions for users who do not enable the new experimental ehci code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2011-05-30 11:40:45 +02:00 committed by Gerd Hoffmann
parent ba3f9bfba9
commit e4b1776765
1 changed files with 39 additions and 0 deletions
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39
usb-linux.c
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@ -1088,6 +1088,42 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
return 0;
}
/*
* Check if we can safely redirect a usb2 device to a usb1 virtual controller,
* this function assumes this is safe, if:
* 1) There are no isoc endpoints
* 2) There are no interrupt endpoints with a max_packet_size > 64
* Note bulk endpoints with a max_packet_size > 64 in theory also are not
* usb1 compatible, but in practice this seems to work fine.
*/
static int usb_linux_full_speed_compat(USBHostDevice *dev)
{
int i, packet_size;
/*
* usb_linux_update_endp_table only registers info about ep in the current
* interface altsettings, so we need to parse the descriptors again.
*/
for (i = 0; (i + 5) < dev->descr_len; i += dev->descr[i]) {
if (dev->descr[i + 1] == USB_DT_ENDPOINT) {
switch (dev->descr[i + 3] & 0x3) {
case 0x00: /* CONTROL */
break;
case 0x01: /* ISO */
return 0;
case 0x02: /* BULK */
break;
case 0x03: /* INTERRUPT */
packet_size = dev->descr[i + 4] + (dev->descr[i + 5] << 8);
if (packet_size > 64)
return 0;
break;
}
}
}
return 1;
}
static int usb_host_open(USBHostDevice *dev, int bus_num,
int addr, char *port, const char *prod_name, int speed)
{
@ -1168,6 +1204,9 @@ static int usb_host_open(USBHostDevice *dev, int bus_num,
}
dev->dev.speed = speed;
dev->dev.speedmask = (1 << speed);
if (dev->dev.speed == USB_SPEED_HIGH && usb_linux_full_speed_compat(dev)) {
dev->dev.speedmask |= USB_SPEED_MASK_FULL;
}
printf("husb: grabbed usb device %d.%d\n", bus_num, addr);