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Commit aac89db8 authored by Patrick Tjin's avatar Patrick Tjin
Browse files

Scan all descriptors when checking for fastboot 



For Linux, the USB code was only looking at the first
descriptor when searching for the fastboot interface
which caused some devices to not be found.

Also clarify some code by using the actual USB structures
instead of void or char pointers.

Change-Id: I9e4871c4d477ac10ba75bb17a955f176809af289
Signed-off-by: default avatarPatrick Tjin <pattjin@google.com>
parent 56cbd19b

fastboot/usb_linux.c

+34 −15
Original line number Diff line number Diff line
@@ -100,12 +100,12 @@ static inline int badname(const char *name) 


static int check(void *_desc, int len, unsigned type, int size)

{

    unsigned char *desc = _desc;

    struct usb_descriptor_header *hdr = (struct usb_descriptor_header *)_desc;



    if(len < size) return -1;

    if(desc[0] < size) return -1;

    if(desc[0] > len) return -1;

    if(desc[1] != type) return -1;

    if(hdr->bLength < size) return -1;

    if(hdr->bLength > len) return -1;

    if(hdr->bDescriptorType != type) return -1;



    return 0;

}
@@ -127,13 +127,13 @@ static int filter_usb_device(char* sysfs_name, 
    

    if (check(ptr, len, USB_DT_DEVICE, USB_DT_DEVICE_SIZE))

        return -1;

    dev = (void*) ptr;

    dev = (struct usb_device_descriptor *)ptr;

    len -= dev->bLength;

    ptr += dev->bLength;



    if (check(ptr, len, USB_DT_CONFIG, USB_DT_CONFIG_SIZE))

        return -1;

    cfg = (void*) ptr;

    cfg = (struct usb_config_descriptor *)ptr;

    len -= cfg->bLength;

    ptr += cfg->bLength;
@@ -177,9 +177,19 @@ static int filter_usb_device(char* sysfs_name, 
    }



    for(i = 0; i < cfg->bNumInterfaces; i++) {

        if(check(ptr, len, USB_DT_INTERFACE, USB_DT_INTERFACE_SIZE))



        while (len > 0) {

	        struct usb_descriptor_header *hdr = (struct usb_descriptor_header *)ptr;

            if (check(hdr, len, USB_DT_INTERFACE, USB_DT_INTERFACE_SIZE) == 0)

                break;

            len -= hdr->bLength;

            ptr += hdr->bLength;

        }



        if (len <= 0)

            return -1;

        ifc = (void*) ptr;



        ifc = (struct usb_interface_descriptor *)ptr;

        len -= ifc->bLength;

        ptr += ifc->bLength;
@@ -190,16 +200,25 @@ static int filter_usb_device(char* sysfs_name, 
        info.ifc_protocol = ifc->bInterfaceProtocol;



        for(e = 0; e < ifc->bNumEndpoints; e++) {

            if(check(ptr, len, USB_DT_ENDPOINT, USB_DT_ENDPOINT_SIZE))

                return -1;

            ept = (void*) ptr;

            while (len > 0) {

	            struct usb_descriptor_header *hdr = (struct usb_descriptor_header *)ptr;

                if (check(hdr, len, USB_DT_ENDPOINT, USB_DT_ENDPOINT_SIZE) == 0)

                    break;

                len -= hdr->bLength;

                ptr += hdr->bLength;

            }

            if (len < 0) {

                break;

            }



            ept = (struct usb_endpoint_descriptor *)ptr;

            len -= ept->bLength;

            ptr += ept->bLength;



            if((ept->bmAttributes & 0x03) != 0x02)

            if((ept->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_BULK)

                continue;



            if(ept->bEndpointAddress & 0x80) {

            if(ept->bEndpointAddress & USB_ENDPOINT_DIR_MASK) {

                in = ept->bEndpointAddress;

            } else {

                out = ept->bEndpointAddress;