/**************************************************************************** * drivers/usbhost/usbhost_composite.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include "usbhost_composite.h" #ifdef CONFIG_USBHOST_COMPOSITE /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* This is the size of a large, allocated temporary buffer that we will use * to construct custom configuration descriptors for each member class. */ #define CUSTOM_CONFIG_BUFSIZE \ (USB_SIZEOF_CFGDESC + 3 * USB_SIZEOF_IFDESC + 9 * USB_SIZEOF_EPDESC) /**************************************************************************** * Private Types ****************************************************************************/ /* This structure describes one component class of the composite */ struct usbhost_member_s { /* This the classobject returned by each contained class */ FAR struct usbhost_class_s *usbclass; /* This is the information that we need to do the registry lookup for this * class member. */ struct usbhost_id_s id; /* This information will be needed to construct a meaningful configuration * for CLASS_CONNSET() */ uint8_t firstif; /* First interface */ uint8_t nifs; /* Number of interfaces */ }; /* This structure contains the internal, private state of the USB host * CDC/ACM class. */ struct usbhost_composite_s { /* This is the externally visible portion of the state. The usbclass must * the first element of the structure. It is then cast compatible with * struct usbhost_composite_s. */ struct usbhost_class_s usbclass; /* Class specific data follows */ uint16_t nclasses; /* Number of component classes in the composite */ /* The following points to an allocated array of type struct * usbhost_member_s. Element element of the array corresponds to one * component class in the composite. */ FAR struct usbhost_member_s *members; }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* struct usbhost_class_s methods */ static int usbhost_connect(FAR struct usbhost_class_s *usbclass, FAR const uint8_t *configdesc, int desclen); static int usbhost_disconnected(FAR struct usbhost_class_s *usbclass); /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: usbhost_disconnect_all * * Description: * Disconnect all contained class instances. * * Input Parameters: * priv - Reference to private, composite container state structure. * * Returned Value: * None * ****************************************************************************/ static void usbhost_disconnect_all(FAR struct usbhost_composite_s *priv) { FAR struct usbhost_member_s *member; int i; /* Loop, processing each class that has been included into the composite */ for (i = 0; i < priv->nclasses; i++) { member = &priv->members[i]; /* Has this member been included to the composite? */ if (member->usbclass != NULL) { /* Yes.. disconnect it, freeing all of the class resources */ CLASS_DISCONNECTED(member->usbclass); member->usbclass = NULL; } } } /**************************************************************************** * Name: usbhost_connect * * Description: * This function implements the connect() method of struct * usbhost_class_s. This method is a callback into the class * implementation from the common enumeration logic. It is normally used * to provide the device's configuration descriptor to the class so that * the class may initialize properly. That calling sequence is: * * 1. usbhost_enumerate() * 2. usbhost_classbind() * 3. CLASS_CONNECT() * * However, that applies only to the Non-composite device. * usbhost_classbind() is not called for the composite device and, hence, * this method is never called. Rather, the composite logic calls * CLASS_CONNECT() for each member of the composite in a calling sequence * like: * * 1. usbhost_enumerate() * 2. usbhost_composite() * 3. Call CLASS_CONNECT() for each composite member * * Input Parameters: * usbclass - The USB host class entry previously obtained from a call to * create(). * configdesc - A pointer to a uint8_t buffer container the configuration * descriptor. * desclen - The length in bytes of the configuration descriptor. * * Returned Value: * On success, zero (OK) is returned. On a failure, a negated errno value * is returned indicating the nature of the failure * * NOTE that the class instance remains valid upon return with a failure. * It is the responsibility of the higher level enumeration logic to call * CLASS_DISCONNECTED to free up the class driver resources. * * Assumptions: * - This function will *not* be called from an interrupt handler. * - If this function returns an error, the USB host controller driver * must call to DISCONNECTED method to recover from the error * ****************************************************************************/ static int usbhost_connect(FAR struct usbhost_class_s *usbclass, FAR const uint8_t *configdesc, int desclen) { return -ENOSYS; } /**************************************************************************** * Name: usbhost_disconnected * * Description: * This function implements the disconnected() method of struct * usbhost_class_s. This method is a callback into the class * implementation. It is used to inform the class that the USB device has * been disconnected. * * Input Parameters: * usbclass - The USB host class entry previously obtained from a call to * create(). * * Returned Value: * On success, zero (OK) is returned. On a failure, a negated errno value * is returned indicating the nature of the failure * * Assumptions: * This function may be called from an interrupt handler. * ****************************************************************************/ static int usbhost_disconnected(struct usbhost_class_s *usbclass) { FAR struct usbhost_composite_s *priv = (FAR struct usbhost_composite_s *)usbclass; DEBUGASSERT(priv != NULL); /* Forward the disconnect event to each contained class in the composite. */ usbhost_disconnect_all(priv); /* Free the allocate array of composite members */ if (priv->members != NULL) { kmm_free(priv->members); } /* The destroy the composite container itself */ kmm_free(priv); return OK; } /**************************************************************************** * Name: usbhost_copyinterface * * Description: * Find an interface descriptor and copy it along with all of its * following endpoint and cs interface descriptors. * * Input Parameters: * ifno - The interface ID to find. * configdesc - The original configuration descriptor that contains the * the interface descriptor. * desclen - the length of configdesc. * buffer - The buffer in which to return the descriptors * buflen - The length of buffer * * Returned Value: * On success, the number of bytes copied is returned. On a failure, a * negated errno value is returned indicating the nature of the failure: * * -ENOENT: Did not find interface descriptor * -EINVAL: Did not find all endpoint descriptors * -ENOSPC: Provided buffer too small to hold all found descriptors * ****************************************************************************/ static int usbhost_copyinterface(uint8_t ifno, FAR const uint8_t *configdesc, int desclen, FAR uint8_t *buffer, int buflen) { FAR struct usb_desc_s *desc; FAR struct usb_ifdesc_s *ifdesc; int retsize; int offset; int neps; int len; /* Make sure that the buffer will hold at least the interface descriptor */ if (buflen < USB_SIZEOF_IFDESC) { return -ENOSPC; } /* Search for the interface */ for (offset = 0, retsize = 0; offset < desclen - sizeof(struct usb_desc_s); offset += len) { desc = (FAR struct usb_desc_s *)&configdesc[offset]; len = desc->len; /* Is this an interface descriptor? */ if (desc->type == USB_DESC_TYPE_INTERFACE) { ifdesc = (FAR struct usb_ifdesc_s *)&configdesc[offset]; /* Is it the one we are looking for? */ if (ifdesc->ifno == ifno && ifdesc->neps != 0) { /* Yes.. return the interface descriptor */ memcpy(buffer, desc, len); buffer += len; buflen -= len; retsize += len; /* Make sure that the buffer will hold at least the endpoint * descriptors. */ neps = ifdesc->neps; if (buflen < neps * USB_SIZEOF_EPDESC) { return -ENOSPC; } /* The CS and endpoint descriptors should immediately * follow the interface descriptor. */ for (offset += len; offset < desclen - sizeof(struct usb_desc_s); offset += len) { desc = (FAR struct usb_desc_s *)&configdesc[offset]; len = desc->len; /* Is this a class-specific interface descriptor? */ if (desc->type == USB_DESC_TYPE_CSINTERFACE) { /* Yes... return the descriptor */ if (buflen < len) { return -ENOSPC; } memcpy(buffer, desc, len); buffer += len; buflen -= len; retsize += len; } /* Is this an endpoint descriptor? */ else if (desc->type == USB_DESC_TYPE_ENDPOINT) { /* Yes.. return the endpoint descriptor */ if (buflen < len) { return -ENOSPC; } memcpy(buffer, desc, len); buffer += len; buflen -= len; retsize += len; /* And reduce the number of endpoints we are looking * for. */ if (--neps <= 0) { /* That is all of them! Return the total size * copied. */ return retsize; } } /* The endpoint descriptors following the interface * descriptor should all be contiguous. But we will * complain only if another interface descriptor is * encountered before all of the endpoint descriptors have * been found. */ else if (desc->type == USB_DESC_TYPE_INTERFACE) { break; } } /* Did not find all of the interface descriptors */ return -EINVAL; } } } /* Could not find the interface descriptor */ return -ENOENT; } /**************************************************************************** * Name: usbhost_createconfig * * Description: * Create a custom configuration for a member class. * * Input Parameters: * configdesc - The original configuration descriptor that contains the * the interface descriptor. * desclen - the length of configdesc. * buffer - The buffer in which to return the descriptors * buflen - The length of buffer * * Returned Value: * On success, the size of the new configuration descriptor is returned. * On a failure, a negated errno value is returned indicating the nature * of the failure: * * -ENOENT: Did not find interface descriptor * -EINVAL: Did not find all endpoint descriptors * ****************************************************************************/ static int usbhost_createconfig(FAR struct usbhost_member_s *member, FAR const uint8_t *configdesc, int desclen, FAR uint8_t *buffer, int buflen) { FAR struct usb_cfgdesc_s *cfgdesc; int cfgsize; int ifsize; int ifno; int nifs; /* Copy and modify the original configuration descriptor */ if (buflen < USB_SIZEOF_CFGDESC) { return -ENOSPC; } memcpy(buffer, configdesc, USB_SIZEOF_CFGDESC); cfgdesc = (FAR struct usb_cfgdesc_s *)buffer; cfgsize = USB_SIZEOF_CFGDESC; buffer += USB_SIZEOF_CFGDESC; buflen -= USB_SIZEOF_CFGDESC; /* Modify the copied configuration descriptor */ cfgdesc->len = USB_SIZEOF_CFGDESC; cfgdesc->ninterfaces = member->nifs; /* Then copy all of the interfaces to the configuration buffer */ for (nifs = 0, ifno = member->firstif; nifs < member->nifs; nifs++, ifno++) { ifsize = usbhost_copyinterface(ifno, configdesc, desclen, buffer, buflen); if (ifsize < 0) { uerr("ERROR: Failed to copy interface: %d\n", ifsize); return ifsize; } /* Update sizes and pointers */ cfgsize += ifsize; buffer += ifsize; buflen -= ifsize; } /* Set the totallen of the configuration descriptor and return success */ cfgdesc->totallen[0] = cfgsize & 0xff; /* Little endian always */ cfgdesc->totallen[1] = cfgsize >> 8; return cfgsize; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: usbhost_composite * * Description: * As the final steps in the device enumeration sequence this function * will be called in order to determine (1) determine if the device is * a composite device, and if so, (2) create the composite class which * contains all of the individual class instances making up the composite. * * Input Parameters: * hport - The downstream port to which the (potential) composite * device has been connected. * configdesc - The full configuration descriptor * desclen - The length of the configuration descriptor * id - Lookup information extracted from the device descriptor. * for the case of the composite devices, we need only the * vid and pid. * usbclass - If the class driver for the device is successful located * and bound to the hub port, the allocated class instance * is returned into this caller-provided memory location. * * Returned Value: * Zero (OK) is returned if (1) the device was determined to be a * composite device and (2) the composite class wrapper was successfully * created and bound to the HCD. A negated errno value is returned on * any failure. The value -ENOENT, in particular means that the attached * device is not a composite device. Other values would indicate other * various, unexpected failures. * ****************************************************************************/ int usbhost_composite(FAR struct usbhost_hubport_s *hport, FAR const uint8_t *configdesc, int desclen, FAR struct usbhost_id_s *id, FAR struct usbhost_class_s **usbclass) { FAR struct usbhost_composite_s *priv; FAR struct usbhost_member_s *member; FAR const struct usbhost_registry_s *reg; FAR struct usb_desc_s *desc; FAR uint8_t *cfgbuffer; uint32_t mergeset; uint16_t nintfs; uint16_t nmerged; uint16_t nclasses; int cfgsize; int offset; int ret; int i; /* Determine if this a composite device has been connected to the * downstream port. * * First look at there device descriptor information. A composite * device is only possible if: * * 1. Manufacturers of composite devices typically assign a value of zero * to the device class (bDeviceClass), subclass (bDeviceSubClass), and * protocol (bDeviceProtocol) fields in the device descriptor, as * specified by the Universal Serial Bus Specification. This allows * the manufacturer to associate each individual interface with a * different device class and protocol. * * 2. The USB-IF core team has devised a special class and protocol code * set that notifies the operating system that one or more IADs are * present in device firmware. A device's device descriptor must have * the values that appear in the following table: * * bDeviceClass 0xEF * bDeviceSubClass 0x02 * bDeviceProtocol 0x01 */ if (id->base != USB_CLASS_PER_INTERFACE && id->base != USB_CLASS_MISC) { return -ENOENT; } /* First, count the number of interface descriptors (nintfs) and the * number of interfaces that are associated to one device via IAD * descriptor (nmerged). */ mergeset = 0; nintfs = 0; nmerged = 0; for (offset = 0; offset < desclen - sizeof(struct usb_desc_s); ) { desc = (FAR struct usb_desc_s *)&configdesc[offset]; int len = desc->len; if (offset + len <= desclen) { /* Is this an interface descriptor? */ if (desc->type == USB_DESC_TYPE_INTERFACE) { #ifdef CONFIG_DEBUG_ASSERTIONS FAR struct usb_ifdesc_s *ifdesc = (FAR struct usb_ifdesc_s *)desc; DEBUGASSERT(ifdesc->ifno < 32); #endif /* Increment the count of interfaces */ nintfs++; } /* Check for IAD descriptors that will be used when it is * necessary to associate multiple interfaces with a single * class driver. */ else if (desc->type == USB_DESC_TYPE_INTERFACEASSOCIATION) { FAR struct usb_iaddesc_s *iad = (FAR struct usb_iaddesc_s *)desc; uint32_t mask; /* Keep count of the number of interfaces that will be merged */ nmerged += (iad->nifs - 1); /* Keep track of which interfaces will be merged */ DEBUGASSERT(iad->firstif + iad->nifs < 32); mask = (1 << iad->nifs) - 1; mergeset |= mask << iad->firstif; } } offset += len; } if (nintfs < 2) { /* Only one interface descriptor. Can't be a composite device */ return -ENOENT; } #if 0 /* I think not needed, the device descriptor classid check should handle this */ /* Special case: Some NON-composite device have more than on interface: CDC/ACM * and MSC both may have two interfaces. */ if (nintfs < 3 && nmerged == 0) { /* Do the special case checks */ #warning Missing logic } #endif /* The total number of classes is then the number of interfaces minus the * number of interfaces merged via the IAD descriptor. */ if (nintfs <= nmerged) { /* Should not happen. Means a bug. */ return -EINVAL; } nclasses = nintfs - nmerged; /* Allocate the composite class container */ priv = (FAR struct usbhost_composite_s *) kmm_zalloc(sizeof(struct usbhost_composite_s)); if (priv == NULL) { uerr("ERROR: Failed to allocate class container\n"); return -ENOMEM; } priv->members = (FAR struct usbhost_member_s *) kmm_zalloc(nclasses * sizeof(struct usbhost_member_s)); if (priv->members == NULL) { uerr("ERROR: Failed to allocate class members\n"); ret = -ENOMEM; goto errout_with_container; } /* Initialize the non-zero elements of the class container */ priv->usbclass.hport = hport; priv->usbclass.connect = usbhost_connect; priv->usbclass.disconnected = usbhost_disconnected; priv->nclasses = nclasses; /* Re-parse the configuration descriptor and save the CLASS ID information * in the member structure: If the interface is defined by an interface * descriptor, then we have to use the info in the interface descriptor; * If the interface has a IAD, we have to use info in the IAD. */ for (i = 0, offset = 0; offset < desclen - sizeof(struct usb_desc_s); ) { desc = (FAR struct usb_desc_s *)&configdesc[offset]; int len = desc->len; if (offset + len <= desclen) { /* Is this an interface descriptor? */ if (desc->type == USB_DESC_TYPE_INTERFACE) { FAR struct usb_ifdesc_s *ifdesc = (FAR struct usb_ifdesc_s *)desc; /* Was the interface merged via an IAD descriptor? */ DEBUGASSERT(ifdesc->ifno < 32); if ((mergeset & (1 << ifdesc->ifno)) == 0) { /* No, this interface was not merged. Save the registry * lookup information from the interface descriptor. */ member = (FAR struct usbhost_member_s *) &priv->members[i]; member->id.base = ifdesc->classid; member->id.subclass = ifdesc->subclass; member->id.proto = ifdesc->protocol; member->id.vid = id->vid; member->id.pid = id->pid; member->firstif = ifdesc->ifno; member->nifs = 1; /* Increment the member index */ i++; } } /* Check for IAD descriptors that will be used when it is * necessary to associate multiple interfaces with a single * device. */ else if (desc->type == USB_DESC_TYPE_INTERFACEASSOCIATION) { FAR struct usb_iaddesc_s *iad = (FAR struct usb_iaddesc_s *)desc; /* Yes.. Save the registry lookup information from the IAD. */ member = (FAR struct usbhost_member_s *) &priv->members[i]; member->id.base = iad->classid; member->id.subclass = iad->subclass; member->id.proto = iad->protocol; member->id.vid = id->vid; member->id.pid = id->pid; member->firstif = iad->firstif; member->nifs = iad->nifs; /* Increment the member index */ i++; } } offset += len; } /* If everything worked, the final index must be the same as the pre- * calculated number of member classes. */ DEBUGASSERT(i == nclasses); /* Allocate a temporary buffer in which we can construct a custom * configuration descriptor for each member class. */ cfgbuffer = kmm_malloc(CUSTOM_CONFIG_BUFSIZE); if (cfgbuffer == NULL) { uerr("ERROR: Failed to allocate configuration buffer"); ret = -ENOMEM; goto errout_with_members; } /* Now loop, performing the registry lookup and initialization of each * member class in the composite. */ for (i = 0; i < nclasses; i++) { member = &priv->members[i]; /* Is there is a class implementation registered to support this * device. */ reg = usbhost_findclass(&member->id); if (reg == NULL) { uerr("ERROR: usbhost_findclass failed\n"); #ifdef CONFIG_USBHOST_COMPOSITE_STRICT ret = -EINVAL; goto errout_with_cfgbuffer; #else continue; #endif } /* Yes.. there is a class for this device. Get an instance of its * interface. */ member->usbclass = CLASS_CREATE(reg, hport, id); if (member->usbclass == NULL) { uerr("ERROR: CLASS_CREATE failed\n"); ret = -ENOMEM; goto errout_with_cfgbuffer; } /* Construct a custom configuration descriptor for this member */ cfgsize = usbhost_createconfig(member, configdesc, desclen, cfgbuffer, CUSTOM_CONFIG_BUFSIZE); if (cfgsize < 0) { uerr("ERROR: Failed to create the custom configuration: %d\n", cfgsize); ret = cfgsize; goto errout_with_cfgbuffer; } /* Call the newly instantiated classes connect() method provide it * with the configuration information that it needs to initialize * properly. */ ret = CLASS_CONNECT(member->usbclass, cfgbuffer, cfgsize); if (ret < 0) { /* On failure, call the class disconnect method of each contained * class which should then free the allocated usbclass instance. */ uerr("ERROR: CLASS_CONNECT failed: %d\n", ret); goto errout_with_cfgbuffer; } } /* Free the temporary buffer */ kmm_free(cfgbuffer); /* Return our USB class structure */ *usbclass = &priv->usbclass; return OK; errout_with_cfgbuffer: kmm_free(cfgbuffer); errout_with_members: /* On an failure, call the class disconnect method of each contained * class which should then free the allocated usbclass instance. */ usbhost_disconnect_all(priv); /* Free the allocate array of composite members */ if (priv->members != NULL) { kmm_free(priv->members); } errout_with_container: /* Then free the composite container itself */ kmm_free(priv); return ret; } #endif /* CONFIG_USBHOST_COMPOSITE */