532 lines
15 KiB
C
532 lines
15 KiB
C
#include <linux/usb.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <asm/byteorder.h>
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#include "usb.h"
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#include "hcd.h"
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#define USB_MAXALTSETTING 128 /* Hard limit */
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#define USB_MAXENDPOINTS 30 /* Hard limit */
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#define USB_MAXCONFIG 8 /* Arbitrary limit */
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static inline const char *plural(int n)
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{
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return (n == 1 ? "" : "s");
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}
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static int find_next_descriptor(unsigned char *buffer, int size,
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int dt1, int dt2, int *num_skipped)
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{
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struct usb_descriptor_header *h;
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int n = 0;
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unsigned char *buffer0 = buffer;
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/* Find the next descriptor of type dt1 or dt2 */
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while (size > 0) {
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h = (struct usb_descriptor_header *) buffer;
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if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
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break;
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buffer += h->bLength;
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size -= h->bLength;
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++n;
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}
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/* Store the number of descriptors skipped and return the
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* number of bytes skipped */
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if (num_skipped)
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*num_skipped = n;
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return buffer - buffer0;
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}
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static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
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int asnum, struct usb_host_interface *ifp, int num_ep,
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unsigned char *buffer, int size)
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{
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unsigned char *buffer0 = buffer;
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struct usb_endpoint_descriptor *d;
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struct usb_host_endpoint *endpoint;
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int n, i;
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d = (struct usb_endpoint_descriptor *) buffer;
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buffer += d->bLength;
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size -= d->bLength;
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if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
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n = USB_DT_ENDPOINT_AUDIO_SIZE;
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else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
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n = USB_DT_ENDPOINT_SIZE;
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else {
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dev_warn(ddev, "config %d interface %d altsetting %d has an "
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"invalid endpoint descriptor of length %d, skipping\n",
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cfgno, inum, asnum, d->bLength);
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goto skip_to_next_endpoint_or_interface_descriptor;
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}
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i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
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if (i >= 16 || i == 0) {
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dev_warn(ddev, "config %d interface %d altsetting %d has an "
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"invalid endpoint with address 0x%X, skipping\n",
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cfgno, inum, asnum, d->bEndpointAddress);
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goto skip_to_next_endpoint_or_interface_descriptor;
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}
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/* Only store as many endpoints as we have room for */
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if (ifp->desc.bNumEndpoints >= num_ep)
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goto skip_to_next_endpoint_or_interface_descriptor;
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endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
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++ifp->desc.bNumEndpoints;
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memcpy(&endpoint->desc, d, n);
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INIT_LIST_HEAD(&endpoint->urb_list);
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/* Skip over any Class Specific or Vendor Specific descriptors;
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* find the next endpoint or interface descriptor */
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endpoint->extra = buffer;
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i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
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USB_DT_INTERFACE, &n);
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endpoint->extralen = i;
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if (n > 0)
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dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
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n, plural(n), "endpoint");
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return buffer - buffer0 + i;
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skip_to_next_endpoint_or_interface_descriptor:
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i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
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USB_DT_INTERFACE, NULL);
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return buffer - buffer0 + i;
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}
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void usb_release_interface_cache(struct kref *ref)
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{
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struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
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int j;
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for (j = 0; j < intfc->num_altsetting; j++) {
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struct usb_host_interface *alt = &intfc->altsetting[j];
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kfree(alt->endpoint);
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kfree(alt->string);
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}
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kfree(intfc);
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}
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static int usb_parse_interface(struct device *ddev, int cfgno,
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struct usb_host_config *config, unsigned char *buffer, int size,
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u8 inums[], u8 nalts[])
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{
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unsigned char *buffer0 = buffer;
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struct usb_interface_descriptor *d;
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int inum, asnum;
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struct usb_interface_cache *intfc;
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struct usb_host_interface *alt;
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int i, n;
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int len, retval;
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int num_ep, num_ep_orig;
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d = (struct usb_interface_descriptor *) buffer;
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buffer += d->bLength;
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size -= d->bLength;
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if (d->bLength < USB_DT_INTERFACE_SIZE)
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goto skip_to_next_interface_descriptor;
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/* Which interface entry is this? */
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intfc = NULL;
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inum = d->bInterfaceNumber;
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for (i = 0; i < config->desc.bNumInterfaces; ++i) {
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if (inums[i] == inum) {
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intfc = config->intf_cache[i];
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break;
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}
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}
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if (!intfc || intfc->num_altsetting >= nalts[i])
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goto skip_to_next_interface_descriptor;
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/* Check for duplicate altsetting entries */
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asnum = d->bAlternateSetting;
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for ((i = 0, alt = &intfc->altsetting[0]);
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i < intfc->num_altsetting;
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(++i, ++alt)) {
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if (alt->desc.bAlternateSetting == asnum) {
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dev_warn(ddev, "Duplicate descriptor for config %d "
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"interface %d altsetting %d, skipping\n",
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cfgno, inum, asnum);
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goto skip_to_next_interface_descriptor;
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}
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}
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++intfc->num_altsetting;
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memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
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/* Skip over any Class Specific or Vendor Specific descriptors;
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* find the first endpoint or interface descriptor */
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alt->extra = buffer;
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i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
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USB_DT_INTERFACE, &n);
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alt->extralen = i;
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if (n > 0)
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dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
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n, plural(n), "interface");
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buffer += i;
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size -= i;
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/* Allocate space for the right(?) number of endpoints */
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num_ep = num_ep_orig = alt->desc.bNumEndpoints;
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alt->desc.bNumEndpoints = 0; // Use as a counter
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if (num_ep > USB_MAXENDPOINTS) {
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dev_warn(ddev, "too many endpoints for config %d interface %d "
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"altsetting %d: %d, using maximum allowed: %d\n",
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cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
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num_ep = USB_MAXENDPOINTS;
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}
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if (num_ep > 0) { /* Can't allocate 0 bytes */
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len = sizeof(struct usb_host_endpoint) * num_ep;
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alt->endpoint = kzalloc(len, GFP_KERNEL);
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if (!alt->endpoint)
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return -ENOMEM;
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}
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/* Parse all the endpoint descriptors */
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n = 0;
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while (size > 0) {
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if (((struct usb_descriptor_header *) buffer)->bDescriptorType
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== USB_DT_INTERFACE)
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break;
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retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
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num_ep, buffer, size);
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if (retval < 0)
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return retval;
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++n;
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buffer += retval;
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size -= retval;
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}
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if (n != num_ep_orig)
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dev_warn(ddev, "config %d interface %d altsetting %d has %d "
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"endpoint descriptor%s, different from the interface "
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"descriptor's value: %d\n",
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cfgno, inum, asnum, n, plural(n), num_ep_orig);
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return buffer - buffer0;
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skip_to_next_interface_descriptor:
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i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
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USB_DT_INTERFACE, NULL);
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return buffer - buffer0 + i;
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}
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static int usb_parse_configuration(struct device *ddev, int cfgidx,
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struct usb_host_config *config, unsigned char *buffer, int size)
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{
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unsigned char *buffer0 = buffer;
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int cfgno;
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int nintf, nintf_orig;
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int i, j, n;
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struct usb_interface_cache *intfc;
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unsigned char *buffer2;
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int size2;
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struct usb_descriptor_header *header;
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int len, retval;
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u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
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memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
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if (config->desc.bDescriptorType != USB_DT_CONFIG ||
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config->desc.bLength < USB_DT_CONFIG_SIZE) {
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dev_err(ddev, "invalid descriptor for config index %d: "
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"type = 0x%X, length = %d\n", cfgidx,
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config->desc.bDescriptorType, config->desc.bLength);
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return -EINVAL;
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}
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cfgno = config->desc.bConfigurationValue;
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buffer += config->desc.bLength;
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size -= config->desc.bLength;
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nintf = nintf_orig = config->desc.bNumInterfaces;
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if (nintf > USB_MAXINTERFACES) {
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dev_warn(ddev, "config %d has too many interfaces: %d, "
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"using maximum allowed: %d\n",
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cfgno, nintf, USB_MAXINTERFACES);
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nintf = USB_MAXINTERFACES;
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}
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/* Go through the descriptors, checking their length and counting the
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* number of altsettings for each interface */
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n = 0;
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for ((buffer2 = buffer, size2 = size);
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size2 > 0;
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(buffer2 += header->bLength, size2 -= header->bLength)) {
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if (size2 < sizeof(struct usb_descriptor_header)) {
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dev_warn(ddev, "config %d descriptor has %d excess "
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"byte%s, ignoring\n",
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cfgno, size2, plural(size2));
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break;
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}
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header = (struct usb_descriptor_header *) buffer2;
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if ((header->bLength > size2) || (header->bLength < 2)) {
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dev_warn(ddev, "config %d has an invalid descriptor "
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"of length %d, skipping remainder of the config\n",
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cfgno, header->bLength);
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break;
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}
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if (header->bDescriptorType == USB_DT_INTERFACE) {
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struct usb_interface_descriptor *d;
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int inum;
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d = (struct usb_interface_descriptor *) header;
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if (d->bLength < USB_DT_INTERFACE_SIZE) {
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dev_warn(ddev, "config %d has an invalid "
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"interface descriptor of length %d, "
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"skipping\n", cfgno, d->bLength);
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continue;
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}
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inum = d->bInterfaceNumber;
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if (inum >= nintf_orig)
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dev_warn(ddev, "config %d has an invalid "
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"interface number: %d but max is %d\n",
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cfgno, inum, nintf_orig - 1);
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/* Have we already encountered this interface?
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* Count its altsettings */
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for (i = 0; i < n; ++i) {
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if (inums[i] == inum)
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break;
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}
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if (i < n) {
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if (nalts[i] < 255)
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++nalts[i];
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} else if (n < USB_MAXINTERFACES) {
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inums[n] = inum;
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nalts[n] = 1;
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++n;
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}
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} else if (header->bDescriptorType == USB_DT_DEVICE ||
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header->bDescriptorType == USB_DT_CONFIG)
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dev_warn(ddev, "config %d contains an unexpected "
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"descriptor of type 0x%X, skipping\n",
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cfgno, header->bDescriptorType);
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} /* for ((buffer2 = buffer, size2 = size); ...) */
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size = buffer2 - buffer;
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config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
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if (n != nintf)
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dev_warn(ddev, "config %d has %d interface%s, different from "
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"the descriptor's value: %d\n",
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cfgno, n, plural(n), nintf_orig);
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else if (n == 0)
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dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
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config->desc.bNumInterfaces = nintf = n;
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/* Check for missing interface numbers */
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for (i = 0; i < nintf; ++i) {
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for (j = 0; j < nintf; ++j) {
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if (inums[j] == i)
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break;
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}
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if (j >= nintf)
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dev_warn(ddev, "config %d has no interface number "
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"%d\n", cfgno, i);
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}
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/* Allocate the usb_interface_caches and altsetting arrays */
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for (i = 0; i < nintf; ++i) {
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j = nalts[i];
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if (j > USB_MAXALTSETTING) {
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dev_warn(ddev, "too many alternate settings for "
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"config %d interface %d: %d, "
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"using maximum allowed: %d\n",
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cfgno, inums[i], j, USB_MAXALTSETTING);
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nalts[i] = j = USB_MAXALTSETTING;
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}
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len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
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config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
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if (!intfc)
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return -ENOMEM;
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kref_init(&intfc->ref);
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}
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/* Skip over any Class Specific or Vendor Specific descriptors;
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* find the first interface descriptor */
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config->extra = buffer;
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i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
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USB_DT_INTERFACE, &n);
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config->extralen = i;
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if (n > 0)
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dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
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n, plural(n), "configuration");
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buffer += i;
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size -= i;
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/* Parse all the interface/altsetting descriptors */
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while (size > 0) {
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retval = usb_parse_interface(ddev, cfgno, config,
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buffer, size, inums, nalts);
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if (retval < 0)
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return retval;
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buffer += retval;
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size -= retval;
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}
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/* Check for missing altsettings */
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for (i = 0; i < nintf; ++i) {
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intfc = config->intf_cache[i];
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for (j = 0; j < intfc->num_altsetting; ++j) {
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for (n = 0; n < intfc->num_altsetting; ++n) {
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if (intfc->altsetting[n].desc.
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bAlternateSetting == j)
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break;
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}
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if (n >= intfc->num_altsetting)
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dev_warn(ddev, "config %d interface %d has no "
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"altsetting %d\n", cfgno, inums[i], j);
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}
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}
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return 0;
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}
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// hub-only!! ... and only exported for reset/reinit path.
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// otherwise used internally on disconnect/destroy path
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void usb_destroy_configuration(struct usb_device *dev)
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{
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int c, i;
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if (!dev->config)
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return;
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if (dev->rawdescriptors) {
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for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
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kfree(dev->rawdescriptors[i]);
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kfree(dev->rawdescriptors);
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dev->rawdescriptors = NULL;
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}
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for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
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struct usb_host_config *cf = &dev->config[c];
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kfree(cf->string);
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for (i = 0; i < cf->desc.bNumInterfaces; i++) {
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if (cf->intf_cache[i])
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kref_put(&cf->intf_cache[i]->ref,
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usb_release_interface_cache);
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}
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}
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kfree(dev->config);
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dev->config = NULL;
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}
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// hub-only!! ... and only in reset path, or usb_new_device()
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// (used by real hubs and virtual root hubs)
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int usb_get_configuration(struct usb_device *dev)
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{
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struct device *ddev = &dev->dev;
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int ncfg = dev->descriptor.bNumConfigurations;
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int result = -ENOMEM;
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unsigned int cfgno, length;
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unsigned char *buffer;
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unsigned char *bigbuffer;
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struct usb_config_descriptor *desc;
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if (ncfg > USB_MAXCONFIG) {
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dev_warn(ddev, "too many configurations: %d, "
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"using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
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dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
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}
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if (ncfg < 1) {
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dev_err(ddev, "no configurations\n");
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return -EINVAL;
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}
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length = ncfg * sizeof(struct usb_host_config);
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dev->config = kzalloc(length, GFP_KERNEL);
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if (!dev->config)
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goto err2;
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length = ncfg * sizeof(char *);
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dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
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if (!dev->rawdescriptors)
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goto err2;
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buffer = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
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if (!buffer)
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goto err2;
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desc = (struct usb_config_descriptor *)buffer;
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for (cfgno = 0; cfgno < ncfg; cfgno++) {
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/* We grab just the first descriptor so we know how long
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* the whole configuration is */
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result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
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buffer, USB_DT_CONFIG_SIZE);
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if (result < 0) {
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dev_err(ddev, "unable to read config index %d "
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"descriptor/%s\n", cfgno, "start");
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dev_err(ddev, "chopping to %d config(s)\n", cfgno);
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dev->descriptor.bNumConfigurations = cfgno;
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break;
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} else if (result < 4) {
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dev_err(ddev, "config index %d descriptor too short "
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"(expected %i, got %i)\n", cfgno,
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USB_DT_CONFIG_SIZE, result);
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result = -EINVAL;
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goto err;
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}
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length = max((int) le16_to_cpu(desc->wTotalLength),
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USB_DT_CONFIG_SIZE);
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/* Now that we know the length, get the whole thing */
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bigbuffer = kmalloc(length, GFP_KERNEL);
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if (!bigbuffer) {
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result = -ENOMEM;
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goto err;
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}
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|
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
|
|
bigbuffer, length);
|
|
if (result < 0) {
|
|
dev_err(ddev, "unable to read config index %d "
|
|
"descriptor/%s\n", cfgno, "all");
|
|
kfree(bigbuffer);
|
|
goto err;
|
|
}
|
|
if (result < length) {
|
|
dev_warn(ddev, "config index %d descriptor too short "
|
|
"(expected %i, got %i)\n", cfgno, length, result);
|
|
length = result;
|
|
}
|
|
|
|
dev->rawdescriptors[cfgno] = bigbuffer;
|
|
|
|
result = usb_parse_configuration(&dev->dev, cfgno,
|
|
&dev->config[cfgno], bigbuffer, length);
|
|
if (result < 0) {
|
|
++cfgno;
|
|
goto err;
|
|
}
|
|
}
|
|
result = 0;
|
|
|
|
err:
|
|
kfree(buffer);
|
|
dev->descriptor.bNumConfigurations = cfgno;
|
|
err2:
|
|
if (result == -ENOMEM)
|
|
dev_err(ddev, "out of memory\n");
|
|
return result;
|
|
}
|