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usb.c
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usb.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Most of this source has been derived from the Linux USB
* project:
* (C) Copyright Linus Torvalds 1999
* (C) Copyright Johannes Erdfelt 1999-2001
* (C) Copyright Andreas Gal 1999
* (C) Copyright Gregory P. Smith 1999
* (C) Copyright Deti Fliegl 1999 (new USB architecture)
* (C) Copyright Randy Dunlap 2000
* (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
* (C) Copyright Yggdrasil Computing, Inc. 2000
* (usb_device_id matching changes by Adam J. Richter)
*
* Adapted for U-Boot:
* (C) Copyright 2001 Denis Peter, MPL AG Switzerland
*/
/*
* How it works:
*
* Since this is a bootloader, the devices will not be automatic
* (re)configured on hotplug, but after a restart of the USB the
* device should work.
*
* For each transfer (except "Interrupt") we wait for completion.
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <memalign.h>
#include <asm/processor.h>
#include <linux/compiler.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <errno.h>
#include <usb.h>
#include <linux/delay.h>
#define USB_BUFSIZ 512
static int asynch_allowed;
char usb_started; /* flag for the started/stopped USB status */
#if !CONFIG_IS_ENABLED(DM_USB)
static struct usb_device usb_dev[USB_MAX_DEVICE];
static int dev_index;
/***************************************************************************
* Init USB Device
*/
int usb_init(void)
{
void *ctrl;
struct usb_device *dev;
int i, start_index = 0;
int controllers_initialized = 0;
int ret;
dev_index = 0;
asynch_allowed = 1;
usb_hub_reset();
/* first make all devices unknown */
for (i = 0; i < USB_MAX_DEVICE; i++) {
memset(&usb_dev[i], 0, sizeof(struct usb_device));
usb_dev[i].devnum = -1;
}
/* init low_level USB */
for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
/* init low_level USB */
printf("USB%d: ", i);
ret = usb_lowlevel_init(i, USB_INIT_HOST, &ctrl);
if (ret == -ENODEV) { /* No such device. */
puts("Port not available.\n");
controllers_initialized++;
continue;
}
if (ret) { /* Other error. */
puts("lowlevel init failed\n");
continue;
}
/*
* lowlevel init is OK, now scan the bus for devices
* i.e. search HUBs and configure them
*/
controllers_initialized++;
start_index = dev_index;
printf("scanning bus %d for devices... ", i);
ret = usb_alloc_new_device(ctrl, &dev);
if (ret)
break;
/*
* device 0 is always present
* (root hub, so let it analyze)
*/
ret = usb_new_device(dev);
if (ret)
usb_free_device(dev->controller);
if (start_index == dev_index) {
puts("No USB Device found\n");
continue;
} else {
printf("%d USB Device(s) found\n",
dev_index - start_index);
}
usb_started = 1;
}
debug("scan end\n");
/* if we were not able to find at least one working bus, bail out */
if (controllers_initialized == 0)
puts("USB error: all controllers failed lowlevel init\n");
return usb_started ? 0 : -ENODEV;
}
/******************************************************************************
* Stop USB this stops the LowLevel Part and deregisters USB devices.
*/
int usb_stop(void)
{
int i;
if (usb_started) {
asynch_allowed = 1;
usb_started = 0;
usb_hub_reset();
for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
if (usb_lowlevel_stop(i))
printf("failed to stop USB controller %d\n", i);
}
}
return 0;
}
/******************************************************************************
* Detect if a USB device has been plugged or unplugged.
*/
int usb_detect_change(void)
{
int i, j;
int change = 0;
for (j = 0; j < USB_MAX_DEVICE; j++) {
for (i = 0; i < usb_dev[j].maxchild; i++) {
struct usb_port_status status;
if (usb_get_port_status(&usb_dev[j], i + 1,
&status) < 0)
/* USB request failed */
continue;
if (le16_to_cpu(status.wPortChange) &
USB_PORT_STAT_C_CONNECTION)
change++;
}
}
return change;
}
/* Lock or unlock async schedule on the controller */
__weak int usb_lock_async(struct usb_device *dev, int lock)
{
return 0;
}
/*
* disables the asynch behaviour of the control message. This is used for data
* transfers that uses the exclusiv access to the control and bulk messages.
* Returns the old value so it can be restored later.
*/
int usb_disable_asynch(int disable)
{
int old_value = asynch_allowed;
asynch_allowed = !disable;
return old_value;
}
#endif /* !CONFIG_IS_ENABLED(DM_USB) */
/*-------------------------------------------------------------------
* Message wrappers.
*
*/
/*
* submits an Interrupt Message. Some drivers may implement non-blocking
* polling: when non-block is true and the device is not responding return
* -EAGAIN instead of waiting for device to respond.
*/
int usb_int_msg(struct usb_device *dev, unsigned long pipe,
void *buffer, int transfer_len, int interval, bool nonblock)
{
return submit_int_msg(dev, pipe, buffer, transfer_len, interval,
nonblock);
}
/*
* submits a control message and waits for comletion (at least timeout * 1ms)
* If timeout is 0, we don't wait for completion (used as example to set and
* clear keyboards LEDs). For data transfers, (storage transfers) we don't
* allow control messages with 0 timeout, by previousely resetting the flag
* asynch_allowed (usb_disable_asynch(1)).
* returns the transferred length if OK or -1 if error. The transferred length
* and the current status are stored in the dev->act_len and dev->status.
*/
int usb_control_msg(struct usb_device *dev, unsigned int pipe,
unsigned char request, unsigned char requesttype,
unsigned short value, unsigned short index,
void *data, unsigned short size, int timeout)
{
ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
int err;
if ((timeout == 0) && (!asynch_allowed)) {
/* request for a asynch control pipe is not allowed */
return -EINVAL;
}
/* set setup command */
setup_packet->requesttype = requesttype;
setup_packet->request = request;
setup_packet->value = cpu_to_le16(value);
setup_packet->index = cpu_to_le16(index);
setup_packet->length = cpu_to_le16(size);
debug("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
"value 0x%X index 0x%X length 0x%X\n",
request, requesttype, value, index, size);
dev->status = USB_ST_NOT_PROC; /*not yet processed */
err = submit_control_msg(dev, pipe, data, size, setup_packet);
if (err < 0)
return err;
if (timeout == 0)
return (int)size;
/*
* Wait for status to update until timeout expires, USB driver
* interrupt handler may set the status when the USB operation has
* been completed.
*/
while (timeout--) {
if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
break;
mdelay(1);
}
if (dev->status)
return -1;
return dev->act_len;
}
/*-------------------------------------------------------------------
* submits bulk message, and waits for completion. returns 0 if Ok or
* negative if Error.
* synchronous behavior
*/
int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
void *data, int len, int *actual_length, int timeout)
{
if (len < 0)
return -EINVAL;
dev->status = USB_ST_NOT_PROC; /*not yet processed */
if (submit_bulk_msg(dev, pipe, data, len) < 0)
return -EIO;
while (timeout--) {
if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
break;
mdelay(1);
}
*actual_length = dev->act_len;
if (dev->status == 0)
return 0;
else
return -EIO;
}
/*-------------------------------------------------------------------
* Max Packet stuff
*/
/*
* returns the max packet size, depending on the pipe direction and
* the configurations values
*/
int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
{
/* direction is out -> use emaxpacket out */
if ((pipe & USB_DIR_IN) == 0)
return dev->epmaxpacketout[((pipe>>15) & 0xf)];
else
return dev->epmaxpacketin[((pipe>>15) & 0xf)];
}
/*
* The routine usb_set_maxpacket_ep() is extracted from the loop of routine
* usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
* when it is inlined in 1 single routine. What happens is that the register r3
* is used as loop-count 'i', but gets overwritten later on.
* This is clearly a compiler bug, but it is easier to workaround it here than
* to update the compiler (Occurs with at least several GCC 4.{1,2},x
* CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
*
* NOTE: Similar behaviour was observed with GCC4.6 on ARMv5.
*/
static void noinline
usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
{
int b;
struct usb_endpoint_descriptor *ep;
u16 ep_wMaxPacketSize;
ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];
b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);
if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_CONTROL) {
/* Control => bidirectional */
dev->epmaxpacketout[b] = ep_wMaxPacketSize;
dev->epmaxpacketin[b] = ep_wMaxPacketSize;
debug("##Control EP epmaxpacketout/in[%d] = %d\n",
b, dev->epmaxpacketin[b]);
} else {
if ((ep->bEndpointAddress & 0x80) == 0) {
/* OUT Endpoint */
if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
dev->epmaxpacketout[b] = ep_wMaxPacketSize;
debug("##EP epmaxpacketout[%d] = %d\n",
b, dev->epmaxpacketout[b]);
}
} else {
/* IN Endpoint */
if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
dev->epmaxpacketin[b] = ep_wMaxPacketSize;
debug("##EP epmaxpacketin[%d] = %d\n",
b, dev->epmaxpacketin[b]);
}
} /* if out */
} /* if control */
}
/*
* set the max packed value of all endpoints in the given configuration
*/
static int usb_set_maxpacket(struct usb_device *dev)
{
int i, ii;
for (i = 0; i < dev->config.desc.bNumInterfaces; i++)
for (ii = 0; ii < dev->config.if_desc[i].desc.bNumEndpoints; ii++)
usb_set_maxpacket_ep(dev, i, ii);
return 0;
}
/*******************************************************************************
* Parse the config, located in buffer, and fills the dev->config structure.
* Note that all little/big endian swapping are done automatically.
* (wTotalLength has already been swapped and sanitized when it was read.)
*/
static int usb_parse_config(struct usb_device *dev,
unsigned char *buffer, int cfgno)
{
struct usb_descriptor_header *head;
int index, ifno, epno, curr_if_num;
u16 ep_wMaxPacketSize;
struct usb_interface *if_desc = NULL;
ifno = -1;
epno = -1;
curr_if_num = -1;
dev->configno = cfgno;
head = (struct usb_descriptor_header *) &buffer[0];
if (head->bDescriptorType != USB_DT_CONFIG) {
printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
head->bDescriptorType);
return -EINVAL;
}
if (head->bLength != USB_DT_CONFIG_SIZE) {
printf("ERROR: Invalid USB CFG length (%d)\n", head->bLength);
return -EINVAL;
}
memcpy(&dev->config, head, USB_DT_CONFIG_SIZE);
dev->config.no_of_if = 0;
index = dev->config.desc.bLength;
/* Ok the first entry must be a configuration entry,
* now process the others */
head = (struct usb_descriptor_header *) &buffer[index];
while (index + 1 < dev->config.desc.wTotalLength && head->bLength) {
switch (head->bDescriptorType) {
case USB_DT_INTERFACE:
if (head->bLength != USB_DT_INTERFACE_SIZE) {
printf("ERROR: Invalid USB IF length (%d)\n",
head->bLength);
break;
}
if (index + USB_DT_INTERFACE_SIZE >
dev->config.desc.wTotalLength) {
puts("USB IF descriptor overflowed buffer!\n");
break;
}
if (((struct usb_interface_descriptor *) \
head)->bInterfaceNumber != curr_if_num) {
/* this is a new interface, copy new desc */
ifno = dev->config.no_of_if;
if (ifno >= USB_MAXINTERFACES) {
puts("Too many USB interfaces!\n");
/* try to go on with what we have */
return -EINVAL;
}
if_desc = &dev->config.if_desc[ifno];
dev->config.no_of_if++;
memcpy(if_desc, head,
USB_DT_INTERFACE_SIZE);
if_desc->no_of_ep = 0;
if_desc->num_altsetting = 1;
curr_if_num =
if_desc->desc.bInterfaceNumber;
} else {
/* found alternate setting for the interface */
if (ifno >= 0) {
if_desc = &dev->config.if_desc[ifno];
if_desc->num_altsetting++;
}
}
break;
case USB_DT_ENDPOINT:
if (head->bLength != USB_DT_ENDPOINT_SIZE &&
head->bLength != USB_DT_ENDPOINT_AUDIO_SIZE) {
printf("ERROR: Invalid USB EP length (%d)\n",
head->bLength);
break;
}
if (index + head->bLength >
dev->config.desc.wTotalLength) {
puts("USB EP descriptor overflowed buffer!\n");
break;
}
if (ifno < 0) {
puts("Endpoint descriptor out of order!\n");
break;
}
epno = dev->config.if_desc[ifno].no_of_ep;
if_desc = &dev->config.if_desc[ifno];
if (epno >= USB_MAXENDPOINTS) {
printf("Interface %d has too many endpoints!\n",
if_desc->desc.bInterfaceNumber);
return -EINVAL;
}
/* found an endpoint */
if_desc->no_of_ep++;
memcpy(&if_desc->ep_desc[epno], head,
USB_DT_ENDPOINT_SIZE);
ep_wMaxPacketSize = get_unaligned(&dev->config.\
if_desc[ifno].\
ep_desc[epno].\
wMaxPacketSize);
put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
&dev->config.\
if_desc[ifno].\
ep_desc[epno].\
wMaxPacketSize);
debug("if %d, ep %d\n", ifno, epno);
break;
case USB_DT_SS_ENDPOINT_COMP:
if (head->bLength != USB_DT_SS_EP_COMP_SIZE) {
printf("ERROR: Invalid USB EPC length (%d)\n",
head->bLength);
break;
}
if (index + USB_DT_SS_EP_COMP_SIZE >
dev->config.desc.wTotalLength) {
puts("USB EPC descriptor overflowed buffer!\n");
break;
}
if (ifno < 0 || epno < 0) {
puts("EPC descriptor out of order!\n");
break;
}
if_desc = &dev->config.if_desc[ifno];
memcpy(&if_desc->ss_ep_comp_desc[epno], head,
USB_DT_SS_EP_COMP_SIZE);
break;
default:
if (head->bLength == 0)
return -EINVAL;
debug("unknown Description Type : %x\n",
head->bDescriptorType);
#ifdef DEBUG
{
unsigned char *ch = (unsigned char *)head;
int i;
for (i = 0; i < head->bLength; i++)
debug("%02X ", *ch++);
debug("\n\n\n");
}
#endif
break;
}
index += head->bLength;
head = (struct usb_descriptor_header *)&buffer[index];
}
return 0;
}
/***********************************************************************
* Clears an endpoint
* endp: endpoint number in bits 0-3;
* direction flag in bit 7 (1 = IN, 0 = OUT)
*/
int usb_clear_halt(struct usb_device *dev, int pipe)
{
int result;
int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
/* don't clear if failed */
if (result < 0)
return result;
/*
* NOTE: we do not get status and verify reset was successful
* as some devices are reported to lock up upon this check..
*/
usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
/* toggle is reset on clear */
usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
return 0;
}
/**********************************************************************
* get_descriptor type
*/
static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
unsigned char index, void *buf, int size)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
(type << 8) + index, 0, buf, size,
USB_CNTL_TIMEOUT);
}
/**********************************************************************
* gets len of configuration cfgno
*/
int usb_get_configuration_len(struct usb_device *dev, int cfgno)
{
int result;
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, 9);
struct usb_config_descriptor *config;
config = (struct usb_config_descriptor *)&buffer[0];
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
if (result < 9) {
if (result < 0)
printf("unable to get descriptor, error %lX\n",
dev->status);
else
printf("config descriptor too short " \
"(expected %i, got %i)\n", 9, result);
return -EIO;
}
return le16_to_cpu(config->wTotalLength);
}
/**********************************************************************
* gets configuration cfgno and store it in the buffer
*/
int usb_get_configuration_no(struct usb_device *dev, int cfgno,
unsigned char *buffer, int length)
{
int result;
struct usb_config_descriptor *config;
config = (struct usb_config_descriptor *)&buffer[0];
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, length);
debug("get_conf_no %d Result %d, wLength %d\n", cfgno, result,
le16_to_cpu(config->wTotalLength));
config->wTotalLength = result; /* validated, with CPU byte order */
return result;
}
/********************************************************************
* set address of a device to the value in dev->devnum.
* This can only be done by addressing the device via the default address (0)
*/
static int usb_set_address(struct usb_device *dev)
{
debug("set address %d\n", dev->devnum);
return usb_control_msg(dev, usb_snddefctrl(dev), USB_REQ_SET_ADDRESS,
0, (dev->devnum), 0, NULL, 0, USB_CNTL_TIMEOUT);
}
/********************************************************************
* set interface number to interface
*/
int usb_set_interface(struct usb_device *dev, int interface, int alternate)
{
struct usb_interface *if_face = NULL;
int ret, i;
for (i = 0; i < dev->config.desc.bNumInterfaces; i++) {
if (dev->config.if_desc[i].desc.bInterfaceNumber == interface) {
if_face = &dev->config.if_desc[i];
break;
}
}
if (!if_face) {
printf("selecting invalid interface %d", interface);
return -EINVAL;
}
/*
* We should return now for devices with only one alternate setting.
* According to 9.4.10 of the Universal Serial Bus Specification
* Revision 2.0 such devices can return with a STALL. This results in
* some USB sticks timeouting during initialization and then being
* unusable in U-Boot.
*/
if (if_face->num_altsetting == 1)
return 0;
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
alternate, interface, NULL, 0,
USB_CNTL_TIMEOUT * 5);
if (ret < 0)
return ret;
return 0;
}
/********************************************************************
* set configuration number to configuration
*/
static int usb_set_configuration(struct usb_device *dev, int configuration)
{
int res;
debug("set configuration %d\n", configuration);
/* set setup command */
res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_CONFIGURATION, 0,
configuration, 0,
NULL, 0, USB_CNTL_TIMEOUT);
if (res == 0) {
dev->toggle[0] = 0;
dev->toggle[1] = 0;
return 0;
} else
return -EIO;
}
/********************************************************************
* set protocol to protocol
*/
int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
}
/********************************************************************
* set idle
*/
int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
(duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
}
/********************************************************************
* get report
*/
int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
unsigned char id, void *buf, int size)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_REPORT,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
(type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
}
/********************************************************************
* get class descriptor
*/
int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
unsigned char type, unsigned char id, void *buf, int size)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
(type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
}
/********************************************************************
* get string index in buffer
*/
static int usb_get_string(struct usb_device *dev, unsigned short langid,
unsigned char index, void *buf, int size)
{
int i;
int result;
for (i = 0; i < 3; ++i) {
/* some devices are flaky */
result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
(USB_DT_STRING << 8) + index, langid, buf, size,
USB_CNTL_TIMEOUT);
if (result > 0)
break;
}
return result;
}
static void usb_try_string_workarounds(unsigned char *buf, int *length)
{
int newlength, oldlength = *length;
for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
if (!isprint(buf[newlength]) || buf[newlength + 1])
break;
if (newlength > 2) {
buf[0] = newlength;
*length = newlength;
}
}
static int usb_string_sub(struct usb_device *dev, unsigned int langid,
unsigned int index, unsigned char *buf)
{
int rc;
/* Try to read the string descriptor by asking for the maximum
* possible number of bytes */
rc = usb_get_string(dev, langid, index, buf, 255);
/* If that failed try to read the descriptor length, then
* ask for just that many bytes */
if (rc < 2) {
rc = usb_get_string(dev, langid, index, buf, 2);
if (rc == 2)
rc = usb_get_string(dev, langid, index, buf, buf[0]);
}
if (rc >= 2) {
if (!buf[0] && !buf[1])
usb_try_string_workarounds(buf, &rc);
/* There might be extra junk at the end of the descriptor */
if (buf[0] < rc)
rc = buf[0];
rc = rc - (rc & 1); /* force a multiple of two */
}
if (rc < 2)
rc = -EINVAL;
return rc;
}
/********************************************************************
* usb_string:
* Get string index and translate it to ascii.
* returns string length (> 0) or error (< 0)
*/
int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
unsigned char *tbuf;
int err;
unsigned int u, idx;
if (size <= 0 || !buf || !index)
return -EINVAL;
buf[0] = 0;
tbuf = &mybuf[0];
/* get langid for strings if it's not yet known */
if (!dev->have_langid) {
err = usb_string_sub(dev, 0, 0, tbuf);
if (err < 0) {
debug("error getting string descriptor 0 " \
"(error=%lx)\n", dev->status);
return -EIO;
} else if (tbuf[0] < 4) {
debug("string descriptor 0 too short\n");
return -EIO;
} else {
dev->have_langid = -1;
dev->string_langid = tbuf[2] | (tbuf[3] << 8);
/* always use the first langid listed */
debug("USB device number %d default " \
"language ID 0x%x\n",
dev->devnum, dev->string_langid);
}
}
err = usb_string_sub(dev, dev->string_langid, index, tbuf);
if (err < 0)
return err;
size--; /* leave room for trailing NULL char in output buffer */
for (idx = 0, u = 2; u < err; u += 2) {
if (idx >= size)
break;
if (tbuf[u+1]) /* high byte */
buf[idx++] = '?'; /* non-ASCII character */
else
buf[idx++] = tbuf[u];
}
buf[idx] = 0;
err = idx;
return err;
}
/********************************************************************
* USB device handling:
* the USB device are static allocated [USB_MAX_DEVICE].
*/
#if !CONFIG_IS_ENABLED(DM_USB)
/* returns a pointer to the device with the index [index].
* if the device is not assigned (dev->devnum==-1) returns NULL
*/
struct usb_device *usb_get_dev_index(int index)
{
if (usb_dev[index].devnum == -1)
return NULL;
else
return &usb_dev[index];
}
int usb_alloc_new_device(struct udevice *controller, struct usb_device **devp)
{
int i;
debug("New Device %d\n", dev_index);
if (dev_index == USB_MAX_DEVICE) {
printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE);
return -ENOSPC;
}
/* default Address is 0, real addresses start with 1 */
usb_dev[dev_index].devnum = dev_index + 1;
usb_dev[dev_index].maxchild = 0;
for (i = 0; i < USB_MAXCHILDREN; i++)
usb_dev[dev_index].children[i] = NULL;
usb_dev[dev_index].parent = NULL;
usb_dev[dev_index].controller = controller;
dev_index++;
*devp = &usb_dev[dev_index - 1];
return 0;
}
/*
* Free the newly created device node.
* Called in error cases where configuring a newly attached
* device fails for some reason.
*/
void usb_free_device(struct udevice *controller)
{
dev_index--;
debug("Freeing device node: %d\n", dev_index);
memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
usb_dev[dev_index].devnum = -1;
}
/*
* XHCI issues Enable Slot command and thereafter
* allocates device contexts. Provide a weak alias
* function for the purpose, so that XHCI overrides it
* and EHCI/OHCI just work out of the box.
*/
__weak int usb_alloc_device(struct usb_device *udev)
{
return 0;
}
#endif /* !CONFIG_IS_ENABLED(DM_USB) */
static int usb_hub_port_reset(struct usb_device *dev, struct usb_device *hub)
{
if (!hub)
usb_reset_root_port(dev);
return 0;
}
static int get_descriptor_len(struct usb_device *dev, int len, int expect_len)
{
__maybe_unused struct usb_device_descriptor *desc;
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
int err;
desc = (struct usb_device_descriptor *)tmpbuf;
err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, len);
if (err < expect_len) {
if (err < 0) {
printf("unable to get device descriptor (error=%d)\n",
err);
return err;
} else {
printf("USB device descriptor short read (expected %i, got %i)\n",
expect_len, err);
return -EIO;
}
}
memcpy(&dev->descriptor, tmpbuf, sizeof(dev->descriptor));
return 0;
}
static int usb_setup_descriptor(struct usb_device *dev, bool do_read)
{
/*
* This is a Windows scheme of initialization sequence, with double
* reset of the device (Linux uses the same sequence)
* Some equipment is said to work only with such init sequence; this
* patch is based on the work by Alan Stern:
* http://sourceforge.net/mailarchive/forum.php?
* thread_id=5729457&forum_id=5398
*/
/*
* send 64-byte GET-DEVICE-DESCRIPTOR request. Since the descriptor is
* only 18 bytes long, this will terminate with a short packet. But if
* the maxpacket size is 8 or 16 the device may be waiting to transmit
* some more, or keeps on retransmitting the 8 byte header.
*/
if (dev->speed == USB_SPEED_LOW) {
dev->descriptor.bMaxPacketSize0 = 8;
dev->maxpacketsize = PACKET_SIZE_8;
} else {
dev->descriptor.bMaxPacketSize0 = 64;
dev->maxpacketsize = PACKET_SIZE_64;
}
dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
if (do_read && dev->speed == USB_SPEED_FULL) {
int err;
/*
* Validate we've received only at least 8 bytes, not that
* we've received the entire descriptor. The reasoning is:
* - The code only uses fields in the first 8 bytes, so
* that's all we need to have fetched at this stage.
* - The smallest maxpacket size is 8 bytes. Before we know
* the actual maxpacket the device uses, the USB controller
* may only accept a single packet. Consequently we are only
* guaranteed to receive 1 packet (at least 8 bytes) even in
* a non-error case.
*
* At least the DWC2 controller needs to be programmed with
* the number of packets in addition to the number of bytes.
* A request for 64 bytes of data with the maxpacket guessed
* as 64 (above) yields a request for 1 packet.
*/
err = get_descriptor_len(dev, 64, 8);
if (err)