3 * Most of this source has been derived from the Linux USB
5 * (C) Copyright Linus Torvalds 1999
6 * (C) Copyright Johannes Erdfelt 1999-2001
7 * (C) Copyright Andreas Gal 1999
8 * (C) Copyright Gregory P. Smith 1999
9 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
10 * (C) Copyright Randy Dunlap 2000
11 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
12 * (C) Copyright Yggdrasil Computing, Inc. 2000
13 * (usb_device_id matching changes by Adam J. Richter)
16 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
18 * See file CREDITS for list of people who contributed to this
21 * This program is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU General Public License as
23 * published by the Free Software Foundation; either version 2 of
24 * the License, or (at your option) any later version.
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
41 * Since this is a bootloader, the devices will not be automatic
42 * (re)configured on hotplug, but after a restart of the USB the
45 * For each transfer (except "Interrupt") we wait for completion.
49 #include <asm/processor.h>
50 #include <linux/compiler.h>
51 #include <linux/ctype.h>
52 #include <asm/byteorder.h>
53 #include <asm/unaligned.h>
57 #include <asm/4xx_pci.h>
60 #define USB_BUFSIZ 512
62 static struct usb_device usb_dev[USB_MAX_DEVICE];
64 static int asynch_allowed;
66 char usb_started; /* flag for the started/stopped USB status */
68 #ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
69 #define CONFIG_USB_MAX_CONTROLLER_COUNT 1
72 /***************************************************************************
78 struct usb_device *dev;
79 int i, start_index = 0;
85 /* first make all devices unknown */
86 for (i = 0; i < USB_MAX_DEVICE; i++) {
87 memset(&usb_dev[i], 0, sizeof(struct usb_device));
88 usb_dev[i].devnum = -1;
91 /* init low_level USB */
92 for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
93 /* init low_level USB */
95 if (usb_lowlevel_init(i, &ctrl)) {
96 puts("lowlevel init failed\n");
100 * lowlevel init is OK, now scan the bus for devices
101 * i.e. search HUBs and configure them
103 start_index = dev_index;
104 printf("scanning bus %d for devices... ", i);
105 dev = usb_alloc_new_device(ctrl);
107 * device 0 is always present
108 * (root hub, so let it analyze)
113 if (start_index == dev_index)
114 puts("No USB Device found\n");
116 printf("%d USB Device(s) found\n",
117 dev_index - start_index);
123 /* if we were not able to find at least one working bus, bail out */
125 puts("USB error: all controllers failed lowlevel init\n");
132 /******************************************************************************
133 * Stop USB this stops the LowLevel Part and deregisters USB devices.
144 for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
145 if (usb_lowlevel_stop(i))
146 printf("failed to stop USB controller %d\n", i);
154 * disables the asynch behaviour of the control message. This is used for data
155 * transfers that uses the exclusiv access to the control and bulk messages.
156 * Returns the old value so it can be restored later.
158 int usb_disable_asynch(int disable)
160 int old_value = asynch_allowed;
162 asynch_allowed = !disable;
167 /*-------------------------------------------------------------------
173 * submits an Interrupt Message
175 int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
176 void *buffer, int transfer_len, int interval)
178 return submit_int_msg(dev, pipe, buffer, transfer_len, interval);
182 * submits a control message and waits for comletion (at least timeout * 1ms)
183 * If timeout is 0, we don't wait for completion (used as example to set and
184 * clear keyboards LEDs). For data transfers, (storage transfers) we don't
185 * allow control messages with 0 timeout, by previousely resetting the flag
186 * asynch_allowed (usb_disable_asynch(1)).
187 * returns the transfered length if OK or -1 if error. The transfered length
188 * and the current status are stored in the dev->act_len and dev->status.
190 int usb_control_msg(struct usb_device *dev, unsigned int pipe,
191 unsigned char request, unsigned char requesttype,
192 unsigned short value, unsigned short index,
193 void *data, unsigned short size, int timeout)
195 ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
197 if ((timeout == 0) && (!asynch_allowed)) {
198 /* request for a asynch control pipe is not allowed */
202 /* set setup command */
203 setup_packet->requesttype = requesttype;
204 setup_packet->request = request;
205 setup_packet->value = cpu_to_le16(value);
206 setup_packet->index = cpu_to_le16(index);
207 setup_packet->length = cpu_to_le16(size);
208 debug("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
209 "value 0x%X index 0x%X length 0x%X\n",
210 request, requesttype, value, index, size);
211 dev->status = USB_ST_NOT_PROC; /*not yet processed */
213 if (submit_control_msg(dev, pipe, data, size, setup_packet) < 0)
219 * Wait for status to update until timeout expires, USB driver
220 * interrupt handler may set the status when the USB operation has
224 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
235 /*-------------------------------------------------------------------
236 * submits bulk message, and waits for completion. returns 0 if Ok or
238 * synchronous behavior
240 int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
241 void *data, int len, int *actual_length, int timeout)
245 dev->status = USB_ST_NOT_PROC; /*not yet processed */
246 if (submit_bulk_msg(dev, pipe, data, len) < 0)
249 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
253 *actual_length = dev->act_len;
254 if (dev->status == 0)
261 /*-------------------------------------------------------------------
266 * returns the max packet size, depending on the pipe direction and
267 * the configurations values
269 int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
271 /* direction is out -> use emaxpacket out */
272 if ((pipe & USB_DIR_IN) == 0)
273 return dev->epmaxpacketout[((pipe>>15) & 0xf)];
275 return dev->epmaxpacketin[((pipe>>15) & 0xf)];
279 * The routine usb_set_maxpacket_ep() is extracted from the loop of routine
280 * usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
281 * when it is inlined in 1 single routine. What happens is that the register r3
282 * is used as loop-count 'i', but gets overwritten later on.
283 * This is clearly a compiler bug, but it is easier to workaround it here than
284 * to update the compiler (Occurs with at least several GCC 4.{1,2},x
285 * CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
287 * NOTE: Similar behaviour was observed with GCC4.6 on ARMv5.
290 usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
293 struct usb_endpoint_descriptor *ep;
294 u16 ep_wMaxPacketSize;
296 ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];
298 b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
299 ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);
301 if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
302 USB_ENDPOINT_XFER_CONTROL) {
303 /* Control => bidirectional */
304 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
305 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
306 debug("##Control EP epmaxpacketout/in[%d] = %d\n",
307 b, dev->epmaxpacketin[b]);
309 if ((ep->bEndpointAddress & 0x80) == 0) {
311 if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
312 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
313 debug("##EP epmaxpacketout[%d] = %d\n",
314 b, dev->epmaxpacketout[b]);
318 if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
319 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
320 debug("##EP epmaxpacketin[%d] = %d\n",
321 b, dev->epmaxpacketin[b]);
328 * set the max packed value of all endpoints in the given configuration
330 static int usb_set_maxpacket(struct usb_device *dev)
334 for (i = 0; i < dev->config.desc.bNumInterfaces; i++)
335 for (ii = 0; ii < dev->config.if_desc[i].desc.bNumEndpoints; ii++)
336 usb_set_maxpacket_ep(dev, i, ii);
341 /*******************************************************************************
342 * Parse the config, located in buffer, and fills the dev->config structure.
343 * Note that all little/big endian swapping are done automatically.
345 static int usb_parse_config(struct usb_device *dev,
346 unsigned char *buffer, int cfgno)
348 struct usb_descriptor_header *head;
349 int index, ifno, epno, curr_if_num;
350 u16 ep_wMaxPacketSize;
351 struct usb_interface *if_desc = NULL;
357 dev->configno = cfgno;
358 head = (struct usb_descriptor_header *) &buffer[0];
359 if (head->bDescriptorType != USB_DT_CONFIG) {
360 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
361 head->bDescriptorType);
364 memcpy(&dev->config, buffer, buffer[0]);
365 le16_to_cpus(&(dev->config.desc.wTotalLength));
366 dev->config.no_of_if = 0;
368 index = dev->config.desc.bLength;
369 /* Ok the first entry must be a configuration entry,
370 * now process the others */
371 head = (struct usb_descriptor_header *) &buffer[index];
372 while (index + 1 < dev->config.desc.wTotalLength) {
373 switch (head->bDescriptorType) {
374 case USB_DT_INTERFACE:
375 if (((struct usb_interface_descriptor *) \
376 &buffer[index])->bInterfaceNumber != curr_if_num) {
377 /* this is a new interface, copy new desc */
378 ifno = dev->config.no_of_if;
379 if_desc = &dev->config.if_desc[ifno];
380 dev->config.no_of_if++;
381 memcpy(if_desc, &buffer[index], buffer[index]);
382 if_desc->no_of_ep = 0;
383 if_desc->num_altsetting = 1;
385 if_desc->desc.bInterfaceNumber;
387 /* found alternate setting for the interface */
389 if_desc = &dev->config.if_desc[ifno];
390 if_desc->num_altsetting++;
394 case USB_DT_ENDPOINT:
395 epno = dev->config.if_desc[ifno].no_of_ep;
396 if_desc = &dev->config.if_desc[ifno];
397 /* found an endpoint */
399 memcpy(&if_desc->ep_desc[epno],
400 &buffer[index], buffer[index]);
401 ep_wMaxPacketSize = get_unaligned(&dev->config.\
405 put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
410 debug("if %d, ep %d\n", ifno, epno);
413 if (head->bLength == 0)
416 debug("unknown Description Type : %x\n",
417 head->bDescriptorType);
421 unsigned char *ch = (unsigned char *)head;
424 for (i = 0; i < head->bLength; i++)
425 debug("%02X ", *ch++);
431 index += head->bLength;
432 head = (struct usb_descriptor_header *)&buffer[index];
437 /***********************************************************************
439 * endp: endpoint number in bits 0-3;
440 * direction flag in bit 7 (1 = IN, 0 = OUT)
442 int usb_clear_halt(struct usb_device *dev, int pipe)
445 int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
447 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
448 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
449 endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
451 /* don't clear if failed */
456 * NOTE: we do not get status and verify reset was successful
457 * as some devices are reported to lock up upon this check..
460 usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
462 /* toggle is reset on clear */
463 usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
468 /**********************************************************************
469 * get_descriptor type
471 static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
472 unsigned char index, void *buf, int size)
475 res = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
476 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
477 (type << 8) + index, 0,
478 buf, size, USB_CNTL_TIMEOUT);
482 /**********************************************************************
483 * gets configuration cfgno and store it in the buffer
485 int usb_get_configuration_no(struct usb_device *dev,
486 unsigned char *buffer, int cfgno)
490 struct usb_config_descriptor *config;
492 config = (struct usb_config_descriptor *)&buffer[0];
493 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
496 printf("unable to get descriptor, error %lX\n",
499 printf("config descriptor too short " \
500 "(expected %i, got %i)\n", 9, result);
503 tmp = le16_to_cpu(config->wTotalLength);
505 if (tmp > USB_BUFSIZ) {
506 printf("usb_get_configuration_no: failed to get " \
507 "descriptor - too long: %d\n", tmp);
511 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp);
512 debug("get_conf_no %d Result %d, wLength %d\n", cfgno, result, tmp);
516 /********************************************************************
517 * set address of a device to the value in dev->devnum.
518 * This can only be done by addressing the device via the default address (0)
520 static int usb_set_address(struct usb_device *dev)
524 debug("set address %d\n", dev->devnum);
525 res = usb_control_msg(dev, usb_snddefctrl(dev),
526 USB_REQ_SET_ADDRESS, 0,
528 NULL, 0, USB_CNTL_TIMEOUT);
532 /********************************************************************
533 * set interface number to interface
535 int usb_set_interface(struct usb_device *dev, int interface, int alternate)
537 struct usb_interface *if_face = NULL;
540 for (i = 0; i < dev->config.desc.bNumInterfaces; i++) {
541 if (dev->config.if_desc[i].desc.bInterfaceNumber == interface) {
542 if_face = &dev->config.if_desc[i];
547 printf("selecting invalid interface %d", interface);
551 * We should return now for devices with only one alternate setting.
552 * According to 9.4.10 of the Universal Serial Bus Specification
553 * Revision 2.0 such devices can return with a STALL. This results in
554 * some USB sticks timeouting during initialization and then being
555 * unusable in U-Boot.
557 if (if_face->num_altsetting == 1)
560 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
561 USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
562 alternate, interface, NULL, 0,
563 USB_CNTL_TIMEOUT * 5);
570 /********************************************************************
571 * set configuration number to configuration
573 static int usb_set_configuration(struct usb_device *dev, int configuration)
576 debug("set configuration %d\n", configuration);
577 /* set setup command */
578 res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
579 USB_REQ_SET_CONFIGURATION, 0,
581 NULL, 0, USB_CNTL_TIMEOUT);
590 /********************************************************************
591 * set protocol to protocol
593 int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
595 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
596 USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
597 protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
600 /********************************************************************
603 int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
605 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
606 USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
607 (duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
610 /********************************************************************
613 int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
614 unsigned char id, void *buf, int size)
616 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
618 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
619 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
622 /********************************************************************
623 * get class descriptor
625 int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
626 unsigned char type, unsigned char id, void *buf, int size)
628 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
629 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
630 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
633 /********************************************************************
634 * get string index in buffer
636 static int usb_get_string(struct usb_device *dev, unsigned short langid,
637 unsigned char index, void *buf, int size)
642 for (i = 0; i < 3; ++i) {
643 /* some devices are flaky */
644 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
645 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
646 (USB_DT_STRING << 8) + index, langid, buf, size,
657 static void usb_try_string_workarounds(unsigned char *buf, int *length)
659 int newlength, oldlength = *length;
661 for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
662 if (!isprint(buf[newlength]) || buf[newlength + 1])
672 static int usb_string_sub(struct usb_device *dev, unsigned int langid,
673 unsigned int index, unsigned char *buf)
677 /* Try to read the string descriptor by asking for the maximum
678 * possible number of bytes */
679 rc = usb_get_string(dev, langid, index, buf, 255);
681 /* If that failed try to read the descriptor length, then
682 * ask for just that many bytes */
684 rc = usb_get_string(dev, langid, index, buf, 2);
686 rc = usb_get_string(dev, langid, index, buf, buf[0]);
690 if (!buf[0] && !buf[1])
691 usb_try_string_workarounds(buf, &rc);
693 /* There might be extra junk at the end of the descriptor */
697 rc = rc - (rc & 1); /* force a multiple of two */
707 /********************************************************************
709 * Get string index and translate it to ascii.
710 * returns string length (> 0) or error (< 0)
712 int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
714 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
719 if (size <= 0 || !buf || !index)
724 /* get langid for strings if it's not yet known */
725 if (!dev->have_langid) {
726 err = usb_string_sub(dev, 0, 0, tbuf);
728 debug("error getting string descriptor 0 " \
729 "(error=%lx)\n", dev->status);
731 } else if (tbuf[0] < 4) {
732 debug("string descriptor 0 too short\n");
735 dev->have_langid = -1;
736 dev->string_langid = tbuf[2] | (tbuf[3] << 8);
737 /* always use the first langid listed */
738 debug("USB device number %d default " \
739 "language ID 0x%x\n",
740 dev->devnum, dev->string_langid);
744 err = usb_string_sub(dev, dev->string_langid, index, tbuf);
748 size--; /* leave room for trailing NULL char in output buffer */
749 for (idx = 0, u = 2; u < err; u += 2) {
752 if (tbuf[u+1]) /* high byte */
753 buf[idx++] = '?'; /* non-ASCII character */
755 buf[idx++] = tbuf[u];
763 /********************************************************************
764 * USB device handling:
765 * the USB device are static allocated [USB_MAX_DEVICE].
769 /* returns a pointer to the device with the index [index].
770 * if the device is not assigned (dev->devnum==-1) returns NULL
772 struct usb_device *usb_get_dev_index(int index)
774 if (usb_dev[index].devnum == -1)
777 return &usb_dev[index];
780 /* returns a pointer of a new device structure or NULL, if
781 * no device struct is available
783 struct usb_device *usb_alloc_new_device(void *controller)
786 debug("New Device %d\n", dev_index);
787 if (dev_index == USB_MAX_DEVICE) {
788 printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE);
791 /* default Address is 0, real addresses start with 1 */
792 usb_dev[dev_index].devnum = dev_index + 1;
793 usb_dev[dev_index].maxchild = 0;
794 for (i = 0; i < USB_MAXCHILDREN; i++)
795 usb_dev[dev_index].children[i] = NULL;
796 usb_dev[dev_index].parent = NULL;
797 usb_dev[dev_index].controller = controller;
799 return &usb_dev[dev_index - 1];
803 * Free the newly created device node.
804 * Called in error cases where configuring a newly attached
805 * device fails for some reason.
807 void usb_free_device(void)
810 debug("Freeing device node: %d\n", dev_index);
811 memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
812 usb_dev[dev_index].devnum = -1;
816 * By the time we get here, the device has gotten a new device ID
817 * and is in the default state. We need to identify the thing and
818 * get the ball rolling..
820 * Returns 0 for success, != 0 for error.
822 int usb_new_device(struct usb_device *dev)
826 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
828 /* We still haven't set the Address yet */
832 #ifdef CONFIG_LEGACY_USB_INIT_SEQ
833 /* this is the old and known way of initializing devices, it is
834 * different than what Windows and Linux are doing. Windows and Linux
835 * both retrieve 64 bytes while reading the device descriptor
836 * Several USB stick devices report ERR: CTL_TIMEOUT, caused by an
837 * invalid header while reading 8 bytes as device descriptor. */
838 dev->descriptor.bMaxPacketSize0 = 8; /* Start off at 8 bytes */
839 dev->maxpacketsize = PACKET_SIZE_8;
840 dev->epmaxpacketin[0] = 8;
841 dev->epmaxpacketout[0] = 8;
843 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, tmpbuf, 8);
845 printf("\n USB device not responding, " \
846 "giving up (status=%lX)\n", dev->status);
849 memcpy(&dev->descriptor, tmpbuf, 8);
851 /* This is a Windows scheme of initialization sequence, with double
852 * reset of the device (Linux uses the same sequence)
853 * Some equipment is said to work only with such init sequence; this
854 * patch is based on the work by Alan Stern:
855 * http://sourceforge.net/mailarchive/forum.php?
856 * thread_id=5729457&forum_id=5398
858 struct usb_device_descriptor *desc;
860 struct usb_device *parent = dev->parent;
861 unsigned short portstatus;
863 /* send 64-byte GET-DEVICE-DESCRIPTOR request. Since the descriptor is
864 * only 18 bytes long, this will terminate with a short packet. But if
865 * the maxpacket size is 8 or 16 the device may be waiting to transmit
866 * some more, or keeps on retransmitting the 8 byte header. */
868 desc = (struct usb_device_descriptor *)tmpbuf;
869 dev->descriptor.bMaxPacketSize0 = 64; /* Start off at 64 bytes */
870 /* Default to 64 byte max packet size */
871 dev->maxpacketsize = PACKET_SIZE_64;
872 dev->epmaxpacketin[0] = 64;
873 dev->epmaxpacketout[0] = 64;
875 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64);
877 debug("usb_new_device: usb_get_descriptor() failed\n");
881 dev->descriptor.bMaxPacketSize0 = desc->bMaxPacketSize0;
883 * Fetch the device class, driver can use this info
884 * to differentiate between HUB and DEVICE.
886 dev->descriptor.bDeviceClass = desc->bDeviceClass;
888 /* find the port number we're at */
892 for (j = 0; j < parent->maxchild; j++) {
893 if (parent->children[j] == dev) {
899 printf("usb_new_device:cannot locate device's port.\n");
903 /* reset the port for the second time */
904 err = hub_port_reset(dev->parent, port, &portstatus);
906 printf("\n Couldn't reset port %i\n", port);
912 dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
913 dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
914 switch (dev->descriptor.bMaxPacketSize0) {
916 dev->maxpacketsize = PACKET_SIZE_8;
919 dev->maxpacketsize = PACKET_SIZE_16;
922 dev->maxpacketsize = PACKET_SIZE_32;
925 dev->maxpacketsize = PACKET_SIZE_64;
930 err = usb_set_address(dev); /* set address */
933 printf("\n USB device not accepting new address " \
934 "(error=%lX)\n", dev->status);
938 mdelay(10); /* Let the SET_ADDRESS settle */
940 tmp = sizeof(dev->descriptor);
942 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
943 tmpbuf, sizeof(dev->descriptor));
946 printf("unable to get device descriptor (error=%d)\n",
949 printf("USB device descriptor short read " \
950 "(expected %i, got %i)\n", tmp, err);
953 memcpy(&dev->descriptor, tmpbuf, sizeof(dev->descriptor));
954 /* correct le values */
955 le16_to_cpus(&dev->descriptor.bcdUSB);
956 le16_to_cpus(&dev->descriptor.idVendor);
957 le16_to_cpus(&dev->descriptor.idProduct);
958 le16_to_cpus(&dev->descriptor.bcdDevice);
959 /* only support for one config for now */
960 err = usb_get_configuration_no(dev, tmpbuf, 0);
962 printf("usb_new_device: Cannot read configuration, " \
963 "skipping device %04x:%04x\n",
964 dev->descriptor.idVendor, dev->descriptor.idProduct);
967 usb_parse_config(dev, tmpbuf, 0);
968 usb_set_maxpacket(dev);
969 /* we set the default configuration here */
970 if (usb_set_configuration(dev, dev->config.desc.bConfigurationValue)) {
971 printf("failed to set default configuration " \
972 "len %d, status %lX\n", dev->act_len, dev->status);
975 debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
976 dev->descriptor.iManufacturer, dev->descriptor.iProduct,
977 dev->descriptor.iSerialNumber);
978 memset(dev->mf, 0, sizeof(dev->mf));
979 memset(dev->prod, 0, sizeof(dev->prod));
980 memset(dev->serial, 0, sizeof(dev->serial));
981 if (dev->descriptor.iManufacturer)
982 usb_string(dev, dev->descriptor.iManufacturer,
983 dev->mf, sizeof(dev->mf));
984 if (dev->descriptor.iProduct)
985 usb_string(dev, dev->descriptor.iProduct,
986 dev->prod, sizeof(dev->prod));
987 if (dev->descriptor.iSerialNumber)
988 usb_string(dev, dev->descriptor.iSerialNumber,
989 dev->serial, sizeof(dev->serial));
990 debug("Manufacturer %s\n", dev->mf);
991 debug("Product %s\n", dev->prod);
992 debug("SerialNumber %s\n", dev->serial);
993 /* now prode if the device is a hub */
994 usb_hub_probe(dev, 0);