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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/core/config.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/usb/core/config.c')
-rw-r--r-- | drivers/usb/core/config.c | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c new file mode 100644 index 0000000..0b092bd --- /dev/null +++ b/drivers/usb/core/config.c @@ -0,0 +1,534 @@ +#include <linux/config.h> + +#ifdef CONFIG_USB_DEBUG +#define DEBUG +#endif + +#include <linux/usb.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <asm/byteorder.h> + + +#define USB_MAXALTSETTING 128 /* Hard limit */ +#define USB_MAXENDPOINTS 30 /* Hard limit */ + +#define USB_MAXCONFIG 8 /* Arbitrary limit */ + + +static inline const char *plural(int n) +{ + return (n == 1 ? "" : "s"); +} + +static int find_next_descriptor(unsigned char *buffer, int size, + int dt1, int dt2, int *num_skipped) +{ + struct usb_descriptor_header *h; + int n = 0; + unsigned char *buffer0 = buffer; + + /* Find the next descriptor of type dt1 or dt2 */ + while (size > 0) { + h = (struct usb_descriptor_header *) buffer; + if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2) + break; + buffer += h->bLength; + size -= h->bLength; + ++n; + } + + /* Store the number of descriptors skipped and return the + * number of bytes skipped */ + if (num_skipped) + *num_skipped = n; + return buffer - buffer0; +} + +static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, + int asnum, struct usb_host_interface *ifp, int num_ep, + unsigned char *buffer, int size) +{ + unsigned char *buffer0 = buffer; + struct usb_endpoint_descriptor *d; + struct usb_host_endpoint *endpoint; + int n, i; + + d = (struct usb_endpoint_descriptor *) buffer; + buffer += d->bLength; + size -= d->bLength; + + if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE) + n = USB_DT_ENDPOINT_AUDIO_SIZE; + else if (d->bLength >= USB_DT_ENDPOINT_SIZE) + n = USB_DT_ENDPOINT_SIZE; + else { + dev_warn(ddev, "config %d interface %d altsetting %d has an " + "invalid endpoint descriptor of length %d, skipping\n", + cfgno, inum, asnum, d->bLength); + goto skip_to_next_endpoint_or_interface_descriptor; + } + + i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK; + if (i >= 16 || i == 0) { + dev_warn(ddev, "config %d interface %d altsetting %d has an " + "invalid endpoint with address 0x%X, skipping\n", + cfgno, inum, asnum, d->bEndpointAddress); + goto skip_to_next_endpoint_or_interface_descriptor; + } + + /* Only store as many endpoints as we have room for */ + if (ifp->desc.bNumEndpoints >= num_ep) + goto skip_to_next_endpoint_or_interface_descriptor; + + endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints]; + ++ifp->desc.bNumEndpoints; + + memcpy(&endpoint->desc, d, n); + INIT_LIST_HEAD(&endpoint->urb_list); + + /* Skip over any Class Specific or Vendor Specific descriptors; + * find the next endpoint or interface descriptor */ + endpoint->extra = buffer; + i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, + USB_DT_INTERFACE, &n); + endpoint->extralen = i; + if (n > 0) + dev_dbg(ddev, "skipped %d descriptor%s after %s\n", + n, plural(n), "endpoint"); + return buffer - buffer0 + i; + +skip_to_next_endpoint_or_interface_descriptor: + i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, + USB_DT_INTERFACE, NULL); + return buffer - buffer0 + i; +} + +void usb_release_interface_cache(struct kref *ref) +{ + struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref); + int j; + + for (j = 0; j < intfc->num_altsetting; j++) + kfree(intfc->altsetting[j].endpoint); + kfree(intfc); +} + +static int usb_parse_interface(struct device *ddev, int cfgno, + struct usb_host_config *config, unsigned char *buffer, int size, + u8 inums[], u8 nalts[]) +{ + unsigned char *buffer0 = buffer; + struct usb_interface_descriptor *d; + int inum, asnum; + struct usb_interface_cache *intfc; + struct usb_host_interface *alt; + int i, n; + int len, retval; + int num_ep, num_ep_orig; + + d = (struct usb_interface_descriptor *) buffer; + buffer += d->bLength; + size -= d->bLength; + + if (d->bLength < USB_DT_INTERFACE_SIZE) + goto skip_to_next_interface_descriptor; + + /* Which interface entry is this? */ + intfc = NULL; + inum = d->bInterfaceNumber; + for (i = 0; i < config->desc.bNumInterfaces; ++i) { + if (inums[i] == inum) { + intfc = config->intf_cache[i]; + break; + } + } + if (!intfc || intfc->num_altsetting >= nalts[i]) + goto skip_to_next_interface_descriptor; + + /* Check for duplicate altsetting entries */ + asnum = d->bAlternateSetting; + for ((i = 0, alt = &intfc->altsetting[0]); + i < intfc->num_altsetting; + (++i, ++alt)) { + if (alt->desc.bAlternateSetting == asnum) { + dev_warn(ddev, "Duplicate descriptor for config %d " + "interface %d altsetting %d, skipping\n", + cfgno, inum, asnum); + goto skip_to_next_interface_descriptor; + } + } + + ++intfc->num_altsetting; + memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE); + + /* Skip over any Class Specific or Vendor Specific descriptors; + * find the first endpoint or interface descriptor */ + alt->extra = buffer; + i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, + USB_DT_INTERFACE, &n); + alt->extralen = i; + if (n > 0) + dev_dbg(ddev, "skipped %d descriptor%s after %s\n", + n, plural(n), "interface"); + buffer += i; + size -= i; + + /* Allocate space for the right(?) number of endpoints */ + num_ep = num_ep_orig = alt->desc.bNumEndpoints; + alt->desc.bNumEndpoints = 0; // Use as a counter + if (num_ep > USB_MAXENDPOINTS) { + dev_warn(ddev, "too many endpoints for config %d interface %d " + "altsetting %d: %d, using maximum allowed: %d\n", + cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS); + num_ep = USB_MAXENDPOINTS; + } + + len = sizeof(struct usb_host_endpoint) * num_ep; + alt->endpoint = kmalloc(len, GFP_KERNEL); + if (!alt->endpoint) + return -ENOMEM; + memset(alt->endpoint, 0, len); + + /* Parse all the endpoint descriptors */ + n = 0; + while (size > 0) { + if (((struct usb_descriptor_header *) buffer)->bDescriptorType + == USB_DT_INTERFACE) + break; + retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt, + num_ep, buffer, size); + if (retval < 0) + return retval; + ++n; + + buffer += retval; + size -= retval; + } + + if (n != num_ep_orig) + dev_warn(ddev, "config %d interface %d altsetting %d has %d " + "endpoint descriptor%s, different from the interface " + "descriptor's value: %d\n", + cfgno, inum, asnum, n, plural(n), num_ep_orig); + return buffer - buffer0; + +skip_to_next_interface_descriptor: + i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, + USB_DT_INTERFACE, NULL); + return buffer - buffer0 + i; +} + +static int usb_parse_configuration(struct device *ddev, int cfgidx, + struct usb_host_config *config, unsigned char *buffer, int size) +{ + unsigned char *buffer0 = buffer; + int cfgno; + int nintf, nintf_orig; + int i, j, n; + struct usb_interface_cache *intfc; + unsigned char *buffer2; + int size2; + struct usb_descriptor_header *header; + int len, retval; + u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; + + memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); + if (config->desc.bDescriptorType != USB_DT_CONFIG || + config->desc.bLength < USB_DT_CONFIG_SIZE) { + dev_err(ddev, "invalid descriptor for config index %d: " + "type = 0x%X, length = %d\n", cfgidx, + config->desc.bDescriptorType, config->desc.bLength); + return -EINVAL; + } + cfgno = config->desc.bConfigurationValue; + + buffer += config->desc.bLength; + size -= config->desc.bLength; + + nintf = nintf_orig = config->desc.bNumInterfaces; + if (nintf > USB_MAXINTERFACES) { + dev_warn(ddev, "config %d has too many interfaces: %d, " + "using maximum allowed: %d\n", + cfgno, nintf, USB_MAXINTERFACES); + nintf = USB_MAXINTERFACES; + } + + /* Go through the descriptors, checking their length and counting the + * number of altsettings for each interface */ + n = 0; + for ((buffer2 = buffer, size2 = size); + size2 > 0; + (buffer2 += header->bLength, size2 -= header->bLength)) { + + if (size2 < sizeof(struct usb_descriptor_header)) { + dev_warn(ddev, "config %d descriptor has %d excess " + "byte%s, ignoring\n", + cfgno, size2, plural(size2)); + break; + } + + header = (struct usb_descriptor_header *) buffer2; + if ((header->bLength > size2) || (header->bLength < 2)) { + dev_warn(ddev, "config %d has an invalid descriptor " + "of length %d, skipping remainder of the config\n", + cfgno, header->bLength); + break; + } + + if (header->bDescriptorType == USB_DT_INTERFACE) { + struct usb_interface_descriptor *d; + int inum; + + d = (struct usb_interface_descriptor *) header; + if (d->bLength < USB_DT_INTERFACE_SIZE) { + dev_warn(ddev, "config %d has an invalid " + "interface descriptor of length %d, " + "skipping\n", cfgno, d->bLength); + continue; + } + + inum = d->bInterfaceNumber; + if (inum >= nintf_orig) + dev_warn(ddev, "config %d has an invalid " + "interface number: %d but max is %d\n", + cfgno, inum, nintf_orig - 1); + + /* Have we already encountered this interface? + * Count its altsettings */ + for (i = 0; i < n; ++i) { + if (inums[i] == inum) + break; + } + if (i < n) { + if (nalts[i] < 255) + ++nalts[i]; + } else if (n < USB_MAXINTERFACES) { + inums[n] = inum; + nalts[n] = 1; + ++n; + } + + } else if (header->bDescriptorType == USB_DT_DEVICE || + header->bDescriptorType == USB_DT_CONFIG) + dev_warn(ddev, "config %d contains an unexpected " + "descriptor of type 0x%X, skipping\n", + cfgno, header->bDescriptorType); + + } /* for ((buffer2 = buffer, size2 = size); ...) */ + size = buffer2 - buffer; + config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0); + + if (n != nintf) + dev_warn(ddev, "config %d has %d interface%s, different from " + "the descriptor's value: %d\n", + cfgno, n, plural(n), nintf_orig); + else if (n == 0) + dev_warn(ddev, "config %d has no interfaces?\n", cfgno); + config->desc.bNumInterfaces = nintf = n; + + /* Check for missing interface numbers */ + for (i = 0; i < nintf; ++i) { + for (j = 0; j < nintf; ++j) { + if (inums[j] == i) + break; + } + if (j >= nintf) + dev_warn(ddev, "config %d has no interface number " + "%d\n", cfgno, i); + } + + /* Allocate the usb_interface_caches and altsetting arrays */ + for (i = 0; i < nintf; ++i) { + j = nalts[i]; + if (j > USB_MAXALTSETTING) { + dev_warn(ddev, "too many alternate settings for " + "config %d interface %d: %d, " + "using maximum allowed: %d\n", + cfgno, inums[i], j, USB_MAXALTSETTING); + nalts[i] = j = USB_MAXALTSETTING; + } + + len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j; + config->intf_cache[i] = intfc = kmalloc(len, GFP_KERNEL); + if (!intfc) + return -ENOMEM; + memset(intfc, 0, len); + kref_init(&intfc->ref); + } + + /* Skip over any Class Specific or Vendor Specific descriptors; + * find the first interface descriptor */ + config->extra = buffer; + i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, + USB_DT_INTERFACE, &n); + config->extralen = i; + if (n > 0) + dev_dbg(ddev, "skipped %d descriptor%s after %s\n", + n, plural(n), "configuration"); + buffer += i; + size -= i; + + /* Parse all the interface/altsetting descriptors */ + while (size > 0) { + retval = usb_parse_interface(ddev, cfgno, config, + buffer, size, inums, nalts); + if (retval < 0) + return retval; + + buffer += retval; + size -= retval; + } + + /* Check for missing altsettings */ + for (i = 0; i < nintf; ++i) { + intfc = config->intf_cache[i]; + for (j = 0; j < intfc->num_altsetting; ++j) { + for (n = 0; n < intfc->num_altsetting; ++n) { + if (intfc->altsetting[n].desc. + bAlternateSetting == j) + break; + } + if (n >= intfc->num_altsetting) + dev_warn(ddev, "config %d interface %d has no " + "altsetting %d\n", cfgno, inums[i], j); + } + } + + return 0; +} + +// hub-only!! ... and only exported for reset/reinit path. +// otherwise used internally on disconnect/destroy path +void usb_destroy_configuration(struct usb_device *dev) +{ + int c, i; + + if (!dev->config) + return; + + if (dev->rawdescriptors) { + for (i = 0; i < dev->descriptor.bNumConfigurations; i++) + kfree(dev->rawdescriptors[i]); + + kfree(dev->rawdescriptors); + dev->rawdescriptors = NULL; + } + + for (c = 0; c < dev->descriptor.bNumConfigurations; c++) { + struct usb_host_config *cf = &dev->config[c]; + + kfree(cf->string); + cf->string = NULL; + + for (i = 0; i < cf->desc.bNumInterfaces; i++) { + if (cf->intf_cache[i]) + kref_put(&cf->intf_cache[i]->ref, + usb_release_interface_cache); + } + } + kfree(dev->config); + dev->config = NULL; +} + + +// hub-only!! ... and only in reset path, or usb_new_device() +// (used by real hubs and virtual root hubs) +int usb_get_configuration(struct usb_device *dev) +{ + struct device *ddev = &dev->dev; + int ncfg = dev->descriptor.bNumConfigurations; + int result = -ENOMEM; + unsigned int cfgno, length; + unsigned char *buffer; + unsigned char *bigbuffer; + struct usb_config_descriptor *desc; + + if (ncfg > USB_MAXCONFIG) { + dev_warn(ddev, "too many configurations: %d, " + "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG); + dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG; + } + + if (ncfg < 1) { + dev_err(ddev, "no configurations\n"); + return -EINVAL; + } + + length = ncfg * sizeof(struct usb_host_config); + dev->config = kmalloc(length, GFP_KERNEL); + if (!dev->config) + goto err2; + memset(dev->config, 0, length); + + length = ncfg * sizeof(char *); + dev->rawdescriptors = kmalloc(length, GFP_KERNEL); + if (!dev->rawdescriptors) + goto err2; + memset(dev->rawdescriptors, 0, length); + + buffer = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL); + if (!buffer) + goto err2; + desc = (struct usb_config_descriptor *)buffer; + + for (cfgno = 0; cfgno < ncfg; cfgno++) { + /* We grab just the first descriptor so we know how long + * the whole configuration is */ + result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, + buffer, USB_DT_CONFIG_SIZE); + if (result < 0) { + dev_err(ddev, "unable to read config index %d " + "descriptor/%s\n", cfgno, "start"); + goto err; + } else if (result < 4) { + dev_err(ddev, "config index %d descriptor too short " + "(expected %i, got %i)\n", cfgno, + USB_DT_CONFIG_SIZE, result); + result = -EINVAL; + goto err; + } + length = max((int) le16_to_cpu(desc->wTotalLength), + USB_DT_CONFIG_SIZE); + + /* Now that we know the length, get the whole thing */ + bigbuffer = kmalloc(length, GFP_KERNEL); + if (!bigbuffer) { + result = -ENOMEM; + goto err; + } + 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; +} |