3 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/stdint.h>
28 #include <sys/param.h>
29 #include <sys/queue.h>
30 #include <sys/types.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
34 #include <sys/module.h>
36 #include <sys/mutex.h>
37 #include <sys/condvar.h>
38 #include <sys/sysctl.h>
39 #include <sys/unistd.h>
40 #include <sys/callout.h>
41 #include <sys/malloc.h>
44 #include <bus/u4b/usb.h>
45 #include <bus/u4b/usbdi.h>
46 #include <bus/u4b/usbdi_util.h>
49 /*------------------------------------------------------------------------*
52 * This function is the safe way to iterate across the USB config
53 * descriptor. It contains several checks against invalid
54 * descriptors. If the "desc" argument passed to this function is
55 * "NULL" the first descriptor, if any, will be returned.
58 * NULL: End of descriptors
59 * Else: Next descriptor after "desc"
60 *------------------------------------------------------------------------*/
61 struct usb_descriptor *
62 usb_desc_foreach(struct usb_config_descriptor *cd,
63 struct usb_descriptor *_desc)
74 /* We assume that the "wTotalLength" has been checked. */
75 start = (uint8_t *)cd;
76 end = start + UGETW(cd->wTotalLength);
77 desc = (uint8_t *)_desc;
79 /* Get start of next USB descriptor. */
83 desc = desc + desc[0];
85 /* Check that the next USB descriptor is within the range. */
86 if ((desc < start) || (desc >= end))
87 return (NULL); /* out of range, or EOD */
89 /* Check that the second next USB descriptor is within range. */
90 desc_next = desc + desc[0];
91 if ((desc_next < start) || (desc_next > end))
92 return (NULL); /* out of range */
94 /* Check minimum descriptor length. */
96 return (NULL); /* too short descriptor */
98 /* Return start of next descriptor. */
99 return ((struct usb_descriptor *)desc);
102 /*------------------------------------------------------------------------*
105 * This function will iterate the interface descriptors in the config
106 * descriptor. The parse state structure should be zeroed before
107 * calling this function the first time.
110 * NULL: End of descriptors
111 * Else: A valid interface descriptor
112 *------------------------------------------------------------------------*/
113 struct usb_interface_descriptor *
114 usb_idesc_foreach(struct usb_config_descriptor *cd,
115 struct usb_idesc_parse_state *ps)
117 struct usb_interface_descriptor *id;
120 /* retrieve current descriptor */
121 id = (struct usb_interface_descriptor *)ps->desc;
122 /* default is to start a new interface */
126 id = (struct usb_interface_descriptor *)
127 usb_desc_foreach(cd, (struct usb_descriptor *)id);
130 if ((id->bDescriptorType == UDESC_INTERFACE) &&
131 (id->bLength >= sizeof(*id))) {
132 if (ps->iface_no_last == id->bInterfaceNumber)
134 ps->iface_no_last = id->bInterfaceNumber;
139 if (ps->desc == NULL) {
141 } else if (new_iface) {
144 ps->iface_index_alt = 0;
146 /* new alternate interface */
147 ps->iface_index_alt ++;
150 /* store and return current descriptor */
151 ps->desc = (struct usb_descriptor *)id;
155 /*------------------------------------------------------------------------*
158 * This function will iterate all the endpoint descriptors within an
159 * interface descriptor. Starting value for the "ped" argument should
160 * be a valid interface descriptor.
163 * NULL: End of descriptors
164 * Else: A valid endpoint descriptor
165 *------------------------------------------------------------------------*/
166 struct usb_endpoint_descriptor *
167 usb_edesc_foreach(struct usb_config_descriptor *cd,
168 struct usb_endpoint_descriptor *ped)
170 struct usb_descriptor *desc;
172 desc = ((struct usb_descriptor *)ped);
174 while ((desc = usb_desc_foreach(cd, desc))) {
175 if (desc->bDescriptorType == UDESC_INTERFACE) {
178 if (desc->bDescriptorType == UDESC_ENDPOINT) {
179 if (desc->bLength < sizeof(*ped)) {
180 /* endpoint descriptor is invalid */
183 return ((struct usb_endpoint_descriptor *)desc);
189 /*------------------------------------------------------------------------*
190 * usb_ed_comp_foreach
192 * This function will iterate all the endpoint companion descriptors
193 * within an endpoint descriptor in an interface descriptor. Starting
194 * value for the "ped" argument should be a valid endpoint companion
198 * NULL: End of descriptors
199 * Else: A valid endpoint companion descriptor
200 *------------------------------------------------------------------------*/
201 struct usb_endpoint_ss_comp_descriptor *
202 usb_ed_comp_foreach(struct usb_config_descriptor *cd,
203 struct usb_endpoint_ss_comp_descriptor *ped)
205 struct usb_descriptor *desc;
207 desc = ((struct usb_descriptor *)ped);
209 while ((desc = usb_desc_foreach(cd, desc))) {
210 if (desc->bDescriptorType == UDESC_INTERFACE)
212 if (desc->bDescriptorType == UDESC_ENDPOINT)
214 if (desc->bDescriptorType == UDESC_ENDPOINT_SS_COMP) {
215 if (desc->bLength < sizeof(*ped)) {
216 /* endpoint companion descriptor is invalid */
219 return ((struct usb_endpoint_ss_comp_descriptor *)desc);
225 /*------------------------------------------------------------------------*
226 * usbd_get_no_descriptors
228 * This function will count the total number of descriptors in the
229 * configuration descriptor of type "type".
230 *------------------------------------------------------------------------*/
232 usbd_get_no_descriptors(struct usb_config_descriptor *cd, uint8_t type)
234 struct usb_descriptor *desc = NULL;
237 while ((desc = usb_desc_foreach(cd, desc))) {
238 if (desc->bDescriptorType == type) {
247 /*------------------------------------------------------------------------*
251 * Number of alternate settings for the given interface descriptor
252 * pointer. If the USB descriptor is corrupt, the returned value can
253 * be greater than the actual number of alternate settings.
254 *------------------------------------------------------------------------*/
256 usbd_get_no_alts(struct usb_config_descriptor *cd,
257 struct usb_interface_descriptor *id)
259 struct usb_descriptor *desc;
263 /* Reset interface count */
267 /* Get the interface number */
269 ifaceno = id->bInterfaceNumber;
271 /* Iterate all the USB descriptors */
274 while ((desc = usb_desc_foreach(cd, desc))) {
275 if ((desc->bDescriptorType == UDESC_INTERFACE) &&
276 (desc->bLength >= sizeof(*id))) {
277 id = (struct usb_interface_descriptor *)desc;
278 if (id->bInterfaceNumber == ifaceno) {