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
);
412 case USB_DT_SS_ENDPOINT_COMP
:
413 if_desc
= &dev
->config
.if_desc
[ifno
];
414 memcpy(&if_desc
->ss_ep_comp_desc
[epno
],
415 &buffer
[index
], buffer
[index
]);
418 if (head
->bLength
== 0)
421 debug("unknown Description Type : %x\n",
422 head
->bDescriptorType
);
426 unsigned char *ch
= (unsigned char *)head
;
429 for (i
= 0; i
< head
->bLength
; i
++)
430 debug("%02X ", *ch
++);
436 index
+= head
->bLength
;
437 head
= (struct usb_descriptor_header
*)&buffer
[index
];
442 /***********************************************************************
444 * endp: endpoint number in bits 0-3;
445 * direction flag in bit 7 (1 = IN, 0 = OUT)
447 int usb_clear_halt(struct usb_device
*dev
, int pipe
)
450 int endp
= usb_pipeendpoint(pipe
)|(usb_pipein(pipe
)<<7);
452 result
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
453 USB_REQ_CLEAR_FEATURE
, USB_RECIP_ENDPOINT
, 0,
454 endp
, NULL
, 0, USB_CNTL_TIMEOUT
* 3);
456 /* don't clear if failed */
461 * NOTE: we do not get status and verify reset was successful
462 * as some devices are reported to lock up upon this check..
465 usb_endpoint_running(dev
, usb_pipeendpoint(pipe
), usb_pipeout(pipe
));
467 /* toggle is reset on clear */
468 usb_settoggle(dev
, usb_pipeendpoint(pipe
), usb_pipeout(pipe
), 0);
473 /**********************************************************************
474 * get_descriptor type
476 static int usb_get_descriptor(struct usb_device
*dev
, unsigned char type
,
477 unsigned char index
, void *buf
, int size
)
480 res
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
481 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
482 (type
<< 8) + index
, 0,
483 buf
, size
, USB_CNTL_TIMEOUT
);
487 /**********************************************************************
488 * gets configuration cfgno and store it in the buffer
490 int usb_get_configuration_no(struct usb_device
*dev
,
491 unsigned char *buffer
, int cfgno
)
495 struct usb_config_descriptor
*config
;
497 config
= (struct usb_config_descriptor
*)&buffer
[0];
498 result
= usb_get_descriptor(dev
, USB_DT_CONFIG
, cfgno
, buffer
, 9);
501 printf("unable to get descriptor, error %lX\n",
504 printf("config descriptor too short " \
505 "(expected %i, got %i)\n", 9, result
);
508 tmp
= le16_to_cpu(config
->wTotalLength
);
510 if (tmp
> USB_BUFSIZ
) {
511 printf("usb_get_configuration_no: failed to get " \
512 "descriptor - too long: %d\n", tmp
);
516 result
= usb_get_descriptor(dev
, USB_DT_CONFIG
, cfgno
, buffer
, tmp
);
517 debug("get_conf_no %d Result %d, wLength %d\n", cfgno
, result
, tmp
);
521 /********************************************************************
522 * set address of a device to the value in dev->devnum.
523 * This can only be done by addressing the device via the default address (0)
525 static int usb_set_address(struct usb_device
*dev
)
529 debug("set address %d\n", dev
->devnum
);
530 res
= usb_control_msg(dev
, usb_snddefctrl(dev
),
531 USB_REQ_SET_ADDRESS
, 0,
533 NULL
, 0, USB_CNTL_TIMEOUT
);
537 /********************************************************************
538 * set interface number to interface
540 int usb_set_interface(struct usb_device
*dev
, int interface
, int alternate
)
542 struct usb_interface
*if_face
= NULL
;
545 for (i
= 0; i
< dev
->config
.desc
.bNumInterfaces
; i
++) {
546 if (dev
->config
.if_desc
[i
].desc
.bInterfaceNumber
== interface
) {
547 if_face
= &dev
->config
.if_desc
[i
];
552 printf("selecting invalid interface %d", interface
);
556 * We should return now for devices with only one alternate setting.
557 * According to 9.4.10 of the Universal Serial Bus Specification
558 * Revision 2.0 such devices can return with a STALL. This results in
559 * some USB sticks timeouting during initialization and then being
560 * unusable in U-Boot.
562 if (if_face
->num_altsetting
== 1)
565 ret
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
566 USB_REQ_SET_INTERFACE
, USB_RECIP_INTERFACE
,
567 alternate
, interface
, NULL
, 0,
568 USB_CNTL_TIMEOUT
* 5);
575 /********************************************************************
576 * set configuration number to configuration
578 static int usb_set_configuration(struct usb_device
*dev
, int configuration
)
581 debug("set configuration %d\n", configuration
);
582 /* set setup command */
583 res
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
584 USB_REQ_SET_CONFIGURATION
, 0,
586 NULL
, 0, USB_CNTL_TIMEOUT
);
595 /********************************************************************
596 * set protocol to protocol
598 int usb_set_protocol(struct usb_device
*dev
, int ifnum
, int protocol
)
600 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
601 USB_REQ_SET_PROTOCOL
, USB_TYPE_CLASS
| USB_RECIP_INTERFACE
,
602 protocol
, ifnum
, NULL
, 0, USB_CNTL_TIMEOUT
);
605 /********************************************************************
608 int usb_set_idle(struct usb_device
*dev
, int ifnum
, int duration
, int report_id
)
610 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
611 USB_REQ_SET_IDLE
, USB_TYPE_CLASS
| USB_RECIP_INTERFACE
,
612 (duration
<< 8) | report_id
, ifnum
, NULL
, 0, USB_CNTL_TIMEOUT
);
615 /********************************************************************
618 int usb_get_report(struct usb_device
*dev
, int ifnum
, unsigned char type
,
619 unsigned char id
, void *buf
, int size
)
621 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
623 USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
,
624 (type
<< 8) + id
, ifnum
, buf
, size
, USB_CNTL_TIMEOUT
);
627 /********************************************************************
628 * get class descriptor
630 int usb_get_class_descriptor(struct usb_device
*dev
, int ifnum
,
631 unsigned char type
, unsigned char id
, void *buf
, int size
)
633 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
634 USB_REQ_GET_DESCRIPTOR
, USB_RECIP_INTERFACE
| USB_DIR_IN
,
635 (type
<< 8) + id
, ifnum
, buf
, size
, USB_CNTL_TIMEOUT
);
638 /********************************************************************
639 * get string index in buffer
641 static int usb_get_string(struct usb_device
*dev
, unsigned short langid
,
642 unsigned char index
, void *buf
, int size
)
647 for (i
= 0; i
< 3; ++i
) {
648 /* some devices are flaky */
649 result
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
650 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
651 (USB_DT_STRING
<< 8) + index
, langid
, buf
, size
,
662 static void usb_try_string_workarounds(unsigned char *buf
, int *length
)
664 int newlength
, oldlength
= *length
;
666 for (newlength
= 2; newlength
+ 1 < oldlength
; newlength
+= 2)
667 if (!isprint(buf
[newlength
]) || buf
[newlength
+ 1])
677 static int usb_string_sub(struct usb_device
*dev
, unsigned int langid
,
678 unsigned int index
, unsigned char *buf
)
682 /* Try to read the string descriptor by asking for the maximum
683 * possible number of bytes */
684 rc
= usb_get_string(dev
, langid
, index
, buf
, 255);
686 /* If that failed try to read the descriptor length, then
687 * ask for just that many bytes */
689 rc
= usb_get_string(dev
, langid
, index
, buf
, 2);
691 rc
= usb_get_string(dev
, langid
, index
, buf
, buf
[0]);
695 if (!buf
[0] && !buf
[1])
696 usb_try_string_workarounds(buf
, &rc
);
698 /* There might be extra junk at the end of the descriptor */
702 rc
= rc
- (rc
& 1); /* force a multiple of two */
712 /********************************************************************
714 * Get string index and translate it to ascii.
715 * returns string length (> 0) or error (< 0)
717 int usb_string(struct usb_device
*dev
, int index
, char *buf
, size_t size
)
719 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf
, USB_BUFSIZ
);
724 if (size
<= 0 || !buf
|| !index
)
729 /* get langid for strings if it's not yet known */
730 if (!dev
->have_langid
) {
731 err
= usb_string_sub(dev
, 0, 0, tbuf
);
733 debug("error getting string descriptor 0 " \
734 "(error=%lx)\n", dev
->status
);
736 } else if (tbuf
[0] < 4) {
737 debug("string descriptor 0 too short\n");
740 dev
->have_langid
= -1;
741 dev
->string_langid
= tbuf
[2] | (tbuf
[3] << 8);
742 /* always use the first langid listed */
743 debug("USB device number %d default " \
744 "language ID 0x%x\n",
745 dev
->devnum
, dev
->string_langid
);
749 err
= usb_string_sub(dev
, dev
->string_langid
, index
, tbuf
);
753 size
--; /* leave room for trailing NULL char in output buffer */
754 for (idx
= 0, u
= 2; u
< err
; u
+= 2) {
757 if (tbuf
[u
+1]) /* high byte */
758 buf
[idx
++] = '?'; /* non-ASCII character */
760 buf
[idx
++] = tbuf
[u
];
768 /********************************************************************
769 * USB device handling:
770 * the USB device are static allocated [USB_MAX_DEVICE].
774 /* returns a pointer to the device with the index [index].
775 * if the device is not assigned (dev->devnum==-1) returns NULL
777 struct usb_device
*usb_get_dev_index(int index
)
779 if (usb_dev
[index
].devnum
== -1)
782 return &usb_dev
[index
];
785 /* returns a pointer of a new device structure or NULL, if
786 * no device struct is available
788 struct usb_device
*usb_alloc_new_device(void *controller
)
791 debug("New Device %d\n", dev_index
);
792 if (dev_index
== USB_MAX_DEVICE
) {
793 printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE
);
796 /* default Address is 0, real addresses start with 1 */
797 usb_dev
[dev_index
].devnum
= dev_index
+ 1;
798 usb_dev
[dev_index
].maxchild
= 0;
799 for (i
= 0; i
< USB_MAXCHILDREN
; i
++)
800 usb_dev
[dev_index
].children
[i
] = NULL
;
801 usb_dev
[dev_index
].parent
= NULL
;
802 usb_dev
[dev_index
].controller
= controller
;
804 return &usb_dev
[dev_index
- 1];
808 * Free the newly created device node.
809 * Called in error cases where configuring a newly attached
810 * device fails for some reason.
812 void usb_free_device(void)
815 debug("Freeing device node: %d\n", dev_index
);
816 memset(&usb_dev
[dev_index
], 0, sizeof(struct usb_device
));
817 usb_dev
[dev_index
].devnum
= -1;
821 * By the time we get here, the device has gotten a new device ID
822 * and is in the default state. We need to identify the thing and
823 * get the ball rolling..
825 * Returns 0 for success, != 0 for error.
827 int usb_new_device(struct usb_device
*dev
)
831 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf
, USB_BUFSIZ
);
833 /* We still haven't set the Address yet */
837 #ifdef CONFIG_LEGACY_USB_INIT_SEQ
838 /* this is the old and known way of initializing devices, it is
839 * different than what Windows and Linux are doing. Windows and Linux
840 * both retrieve 64 bytes while reading the device descriptor
841 * Several USB stick devices report ERR: CTL_TIMEOUT, caused by an
842 * invalid header while reading 8 bytes as device descriptor. */
843 dev
->descriptor
.bMaxPacketSize0
= 8; /* Start off at 8 bytes */
844 dev
->maxpacketsize
= PACKET_SIZE_8
;
845 dev
->epmaxpacketin
[0] = 8;
846 dev
->epmaxpacketout
[0] = 8;
848 err
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0, tmpbuf
, 8);
850 printf("\n USB device not responding, " \
851 "giving up (status=%lX)\n", dev
->status
);
854 memcpy(&dev
->descriptor
, tmpbuf
, 8);
856 /* This is a Windows scheme of initialization sequence, with double
857 * reset of the device (Linux uses the same sequence)
858 * Some equipment is said to work only with such init sequence; this
859 * patch is based on the work by Alan Stern:
860 * http://sourceforge.net/mailarchive/forum.php?
861 * thread_id=5729457&forum_id=5398
863 struct usb_device_descriptor
*desc
;
865 struct usb_device
*parent
= dev
->parent
;
866 unsigned short portstatus
;
868 /* send 64-byte GET-DEVICE-DESCRIPTOR request. Since the descriptor is
869 * only 18 bytes long, this will terminate with a short packet. But if
870 * the maxpacket size is 8 or 16 the device may be waiting to transmit
871 * some more, or keeps on retransmitting the 8 byte header. */
873 desc
= (struct usb_device_descriptor
*)tmpbuf
;
874 dev
->descriptor
.bMaxPacketSize0
= 64; /* Start off at 64 bytes */
875 /* Default to 64 byte max packet size */
876 dev
->maxpacketsize
= PACKET_SIZE_64
;
877 dev
->epmaxpacketin
[0] = 64;
878 dev
->epmaxpacketout
[0] = 64;
880 err
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0, desc
, 64);
882 debug("usb_new_device: usb_get_descriptor() failed\n");
886 dev
->descriptor
.bMaxPacketSize0
= desc
->bMaxPacketSize0
;
888 * Fetch the device class, driver can use this info
889 * to differentiate between HUB and DEVICE.
891 dev
->descriptor
.bDeviceClass
= desc
->bDeviceClass
;
893 /* find the port number we're at */
897 for (j
= 0; j
< parent
->maxchild
; j
++) {
898 if (parent
->children
[j
] == dev
) {
904 printf("usb_new_device:cannot locate device's port.\n");
908 /* reset the port for the second time */
909 err
= hub_port_reset(dev
->parent
, port
, &portstatus
);
911 printf("\n Couldn't reset port %i\n", port
);
917 dev
->epmaxpacketin
[0] = dev
->descriptor
.bMaxPacketSize0
;
918 dev
->epmaxpacketout
[0] = dev
->descriptor
.bMaxPacketSize0
;
919 switch (dev
->descriptor
.bMaxPacketSize0
) {
921 dev
->maxpacketsize
= PACKET_SIZE_8
;
924 dev
->maxpacketsize
= PACKET_SIZE_16
;
927 dev
->maxpacketsize
= PACKET_SIZE_32
;
930 dev
->maxpacketsize
= PACKET_SIZE_64
;
935 err
= usb_set_address(dev
); /* set address */
938 printf("\n USB device not accepting new address " \
939 "(error=%lX)\n", dev
->status
);
943 mdelay(10); /* Let the SET_ADDRESS settle */
945 tmp
= sizeof(dev
->descriptor
);
947 err
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0,
948 tmpbuf
, sizeof(dev
->descriptor
));
951 printf("unable to get device descriptor (error=%d)\n",
954 printf("USB device descriptor short read " \
955 "(expected %i, got %i)\n", tmp
, err
);
958 memcpy(&dev
->descriptor
, tmpbuf
, sizeof(dev
->descriptor
));
959 /* correct le values */
960 le16_to_cpus(&dev
->descriptor
.bcdUSB
);
961 le16_to_cpus(&dev
->descriptor
.idVendor
);
962 le16_to_cpus(&dev
->descriptor
.idProduct
);
963 le16_to_cpus(&dev
->descriptor
.bcdDevice
);
964 /* only support for one config for now */
965 err
= usb_get_configuration_no(dev
, tmpbuf
, 0);
967 printf("usb_new_device: Cannot read configuration, " \
968 "skipping device %04x:%04x\n",
969 dev
->descriptor
.idVendor
, dev
->descriptor
.idProduct
);
972 usb_parse_config(dev
, tmpbuf
, 0);
973 usb_set_maxpacket(dev
);
974 /* we set the default configuration here */
975 if (usb_set_configuration(dev
, dev
->config
.desc
.bConfigurationValue
)) {
976 printf("failed to set default configuration " \
977 "len %d, status %lX\n", dev
->act_len
, dev
->status
);
980 debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
981 dev
->descriptor
.iManufacturer
, dev
->descriptor
.iProduct
,
982 dev
->descriptor
.iSerialNumber
);
983 memset(dev
->mf
, 0, sizeof(dev
->mf
));
984 memset(dev
->prod
, 0, sizeof(dev
->prod
));
985 memset(dev
->serial
, 0, sizeof(dev
->serial
));
986 if (dev
->descriptor
.iManufacturer
)
987 usb_string(dev
, dev
->descriptor
.iManufacturer
,
988 dev
->mf
, sizeof(dev
->mf
));
989 if (dev
->descriptor
.iProduct
)
990 usb_string(dev
, dev
->descriptor
.iProduct
,
991 dev
->prod
, sizeof(dev
->prod
));
992 if (dev
->descriptor
.iSerialNumber
)
993 usb_string(dev
, dev
->descriptor
.iSerialNumber
,
994 dev
->serial
, sizeof(dev
->serial
));
995 debug("Manufacturer %s\n", dev
->mf
);
996 debug("Product %s\n", dev
->prod
);
997 debug("SerialNumber %s\n", dev
->serial
);
998 /* now prode if the device is a hub */
999 usb_hub_probe(dev
, 0);