diff options
Diffstat (limited to 'drivers/usb/core/config.c')
| -rw-r--r-- | drivers/usb/core/config.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index dd3482328ad2..cb69aa1e02e8 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -85,15 +85,21 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, memcpy(&endpoint->desc, d, n); INIT_LIST_HEAD(&endpoint->urb_list); - /* If the bInterval value is outside the legal range, - * set it to a default value: 32 ms */ + /* Fix up bInterval values outside the legal range. Use 32 ms if no + * proper value can be guessed. */ i = 0; /* i = min, j = max, n = default */ j = 255; if (usb_endpoint_xfer_int(d)) { i = 1; switch (to_usb_device(ddev)->speed) { case USB_SPEED_HIGH: - n = 9; /* 32 ms = 2^(9-1) uframes */ + /* Many device manufacturers are using full-speed + * bInterval values in high-speed interrupt endpoint + * descriptors. Try to fix those and fall back to a + * 32 ms default value otherwise. */ + n = fls(d->bInterval*8); + if (n == 0) + n = 9; /* 32 ms = 2^(9-1) uframes */ j = 16; break; default: /* USB_SPEED_FULL or _LOW */ @@ -124,6 +130,21 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, endpoint->desc.bInterval = n; } + /* Some buggy low-speed devices have Bulk endpoints, which is + * explicitly forbidden by the USB spec. In an attempt to make + * them usable, we will try treating them as Interrupt endpoints. + */ + if (to_usb_device(ddev)->speed == USB_SPEED_LOW && + usb_endpoint_xfer_bulk(d)) { + dev_warn(ddev, "config %d interface %d altsetting %d " + "endpoint 0x%X is Bulk; changing to Interrupt\n", + cfgno, inum, asnum, d->bEndpointAddress); + endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT; + endpoint->desc.bInterval = 1; + if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8) + endpoint->desc.wMaxPacketSize = cpu_to_le16(8); + } + /* Skip over any Class Specific or Vendor Specific descriptors; * find the next endpoint or interface descriptor */ endpoint->extra = buffer; @@ -274,6 +295,7 @@ static int usb_parse_configuration(struct device *ddev, int cfgidx, struct usb_descriptor_header *header; int len, retval; u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; + unsigned iad_num = 0; memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); if (config->desc.bDescriptorType != USB_DT_CONFIG || @@ -351,6 +373,20 @@ static int usb_parse_configuration(struct device *ddev, int cfgidx, ++n; } + } else if (header->bDescriptorType == + USB_DT_INTERFACE_ASSOCIATION) { + if (iad_num == USB_MAXIADS) { + dev_warn(ddev, "found more Interface " + "Association Descriptors " + "than allocated for in " + "configuration %d\n", cfgno); + } else { + config->intf_assoc[iad_num] = + (struct usb_interface_assoc_descriptor + *)header; + iad_num++; + } + } else if (header->bDescriptorType == USB_DT_DEVICE || header->bDescriptorType == USB_DT_CONFIG) dev_warn(ddev, "config %d contains an unexpected " |