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incubator-nuttx/drivers/usbhost/usbhost_enumerate.c

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/****************************************************************************
* drivers/usbhost/usbhost_enumerate.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 <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/signal.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/usb/hub.h>
#include <nuttx/usb/usbhost_devaddr.h>
#include "usbhost_composite.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static inline uint16_t usbhost_getle16(const uint8_t *val);
static void usbhost_putle16(uint8_t *dest, uint16_t val);
static inline int usbhost_devdesc(const struct usb_devdesc_s *devdesc,
FAR struct usbhost_id_s *id);
static inline int usbhost_configdesc(const uint8_t *configdesc, int desclen,
uint8_t start_ifnum,
uint8_t *ret_ifnum,
struct usbhost_id_s *id);
static inline int usbhost_classbind(FAR struct usbhost_hubport_s *hport,
FAR const uint8_t *configdesc, int desclen,
FAR struct usbhost_id_s *id,
FAR struct usbhost_class_s **devclass);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_getle16
*
* Description:
* Get a (possibly unaligned) 16-bit little endian value.
*
****************************************************************************/
static inline uint16_t usbhost_getle16(const uint8_t *val)
{
return (uint16_t)val[1] << 8 | (uint16_t)val[0];
}
/****************************************************************************
* Name: usbhost_putle16
*
* Description:
* Put a (possibly unaligned) 16-bit little endian value.
*
****************************************************************************/
static void usbhost_putle16(uint8_t *dest, uint16_t val)
{
dest[0] = val & 0xff; /* Little endian means LS byte first in byte stream */
dest[1] = val >> 8;
}
/****************************************************************************
* Name: usbhost_devdesc
*
* Description:
* A configuration descriptor has been obtained from the device. Find the
* ID information for the class that supports this device.
*
****************************************************************************/
static inline int usbhost_devdesc(FAR const struct usb_devdesc_s *devdesc,
FAR struct usbhost_id_s *id)
{
/* Clear the ID info */
memset(id, 0, sizeof(struct usbhost_id_s));
/* Pick off the class ID info */
id->base = devdesc->classid;
id->subclass = devdesc->subclass;
id->proto = devdesc->protocol;
/* Pick off the VID and PID as well (for vendor specific devices) */
id->vid = usbhost_getle16(devdesc->vendor);
id->pid = usbhost_getle16(devdesc->product);
uinfo("class:%d subclass:%d protocol:%d vid:%04x pid:%04x\n",
id->base, id->subclass, id->proto, id->vid, id->pid);
return OK;
}
/****************************************************************************
* Name: usbhost_configdesc
*
* Description:
* A configuration descriptor has been obtained from the device. Find the
* ID information for the class that supports this device.
*
****************************************************************************/
static inline int usbhost_configdesc(const uint8_t *configdesc, int cfglen,
uint8_t start_ifnum,
uint8_t *ret_ifnum,
struct usbhost_id_s *id)
{
FAR struct usb_cfgdesc_s *cfgdesc;
FAR struct usb_ifdesc_s *ifdesc;
int remaining;
DEBUGASSERT(configdesc != NULL && cfglen >= USB_SIZEOF_CFGDESC);
/* Verify that we were passed a configuration descriptor */
cfgdesc = (struct usb_cfgdesc_s *)configdesc;
uinfo("cfg len:%d total len:%d\n", cfgdesc->len, cfglen);
if (cfgdesc->type != USB_DESC_TYPE_CONFIG)
{
return -EINVAL;
}
/* Skip to the next entry descriptor */
configdesc += cfgdesc->len;
remaining = cfglen - cfgdesc->len;
/* Loop while there are more descriptors to examine */
memset(id, 0, sizeof(FAR struct usb_desc_s));
while (remaining >= sizeof(struct usb_desc_s))
{
/* What is the next descriptor? Is it an interface descriptor? */
ifdesc = (struct usb_ifdesc_s *)configdesc;
if (ifdesc->type == USB_DESC_TYPE_INTERFACE &&
ifdesc->ifno >= start_ifnum)
{
/* Yes, extract the class information from the interface
* descriptor.
* Typically these values are zero meaning that the "real" ID
* information resides in the device descriptor.
*/
DEBUGASSERT(remaining >= sizeof(struct usb_ifdesc_s));
id->base = ifdesc->classid;
id->subclass = ifdesc->subclass;
id->proto = ifdesc->protocol;
uinfo("class:%d subclass:%d protocol:%d\n",
id->base, id->subclass, id->proto);
*ret_ifnum = ifdesc->ifno;
return OK;
}
/* Increment the address of the next descriptor */
configdesc += ifdesc->len;
remaining -= ifdesc->len;
}
return -ENOENT;
}
/****************************************************************************
* Name: usbhost_classbind
*
* Description:
* A configuration descriptor has been obtained from the device. Try to
* bind this configuration descriptor with a supported class.
*
****************************************************************************/
static inline int usbhost_classbind(FAR struct usbhost_hubport_s *hport,
const uint8_t *configdesc, int desclen,
struct usbhost_id_s *id,
FAR struct usbhost_class_s **usbclass)
{
FAR struct usbhost_class_s *devclass;
FAR const struct usbhost_registry_s *reg;
int ret = -EINVAL;
/* Is there is a class implementation registered to support this device. */
reg = usbhost_findclass(id);
uinfo("usbhost_findclass: %p\n", reg);
if (reg != NULL)
{
/* Yes.. there is a class for this device. Get an instance of
* its interface.
*/
ret = -ENOMEM;
devclass = CLASS_CREATE(reg, hport, id);
uinfo("CLASS_CREATE: %p\n", devclass);
if (devclass != NULL)
{
/* Then bind the newly instantiated class instance */
ret = CLASS_CONNECT(devclass, configdesc, desclen);
if (ret < 0)
{
/* On failures, call the class disconnect method which
* should then free the allocated devclass instance.
*/
uerr("ERROR: CLASS_CONNECT failed: %d\n", ret);
CLASS_DISCONNECTED(devclass);
}
else
{
*usbclass = devclass;
}
}
}
uinfo("Returning: %d\n", ret);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_enumerate
*
* Description:
* Enumerate the connected device. As part of this enumeration process,
* the driver will (1) get the device's configuration descriptor, (2)
* extract the class ID info from the configuration descriptor, (3) call
* usbhost_findclass() to find the class that supports this device, (4)
* call the create() method on the struct usbhost_registry_s interface
* to get a class instance, and finally (5) call the configdesc() method
* of the struct usbhost_class_s interface. After that, the class is in
* charge of the sequence of operations.
*
* Input Parameters:
* hport - The hub port that manages the new class.
* devclass - 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:
* On success, zero (OK) is returned. On a failure, a negated errno value
* is returned indicating the nature of the failure
*
* Assumptions:
* - Only a single class bound to a single device is supported.
* - Called from a single thread so no mutual exclusion is required.
* - Never called from an interrupt handler.
*
****************************************************************************/
int usbhost_enumerate(FAR struct usbhost_hubport_s *hport,
FAR struct usbhost_class_s **devclass)
{
FAR struct usb_ctrlreq_s *ctrlreq = NULL;
struct usbhost_id_s id;
size_t maxlen;
unsigned int cfglen;
uint8_t maxpacketsize;
uint8_t descsize;
uint8_t funcaddr = 0;
FAR uint8_t *buffer = NULL;
int ret;
DEBUGASSERT(hport != NULL && hport->drvr != NULL);
/* Allocate descriptor buffers for use in this function. We will need two:
* One for the request and one for the data buffer.
*/
ret = DRVR_ALLOC(hport->drvr, (FAR uint8_t **)&ctrlreq, &maxlen);
if (ret < 0)
{
uerr("ERROR: DRVR_ALLOC failed: %d\n", ret);
return ret;
}
ret = DRVR_ALLOC(hport->drvr, &buffer, &maxlen);
if (ret < 0)
{
uerr("ERROR: DRVR_ALLOC failed: %d\n", ret);
goto errout;
}
/* Pick an appropriate packet size for this device
*
* USB 2.0, Paragraph 5.5.3 "Control Transfer Packet Size Constraints"
*
* "An endpoint for control transfers specifies the maximum data
* payload size that the endpoint can accept from or transmit to
* the bus. The allowable maximum control transfer data payload
* sizes for full-speed devices is 8, 16, 32, or 64 bytes; for
* high-speed devices, it is 64 bytes and for low-speed devices,
* it is 8 bytes. This maximum applies to the data payloads of the
* Data packets following a Setup..."
*/
if (hport->speed == USB_SPEED_HIGH)
{
/* For high-speed, we must use 64 bytes */
maxpacketsize = 64;
descsize = USB_SIZEOF_DEVDESC;
}
else
{
/* Eight will work for both low- and full-speed */
maxpacketsize = 8;
descsize = 8;
}
/* Configure EP0 with the initial maximum packet size */
DRVR_EP0CONFIGURE(hport->drvr, hport->ep0, 0, hport->speed,
maxpacketsize);
/* Read first bytes of the device descriptor */
ctrlreq->type = USB_REQ_DIR_IN | USB_REQ_RECIPIENT_DEVICE;
ctrlreq->req = USB_REQ_GETDESCRIPTOR;
usbhost_putle16(ctrlreq->value, (USB_DESC_TYPE_DEVICE << 8));
usbhost_putle16(ctrlreq->index, 0);
usbhost_putle16(ctrlreq->len, descsize);
ret = DRVR_CTRLIN(hport->drvr, hport->ep0, ctrlreq, buffer);
if (ret < 0)
{
uerr("ERROR: Failed to get device descriptor, length=%d: %d\n",
descsize, ret);
goto errout;
}
/* Extract the correct max packetsize from the device descriptor */
maxpacketsize = ((struct usb_devdesc_s *)buffer)->mxpacketsize;
uinfo("maxpacksetsize: %d\n", maxpacketsize);
/* And reconfigure EP0 with the correct maximum packet size */
DRVR_EP0CONFIGURE(hport->drvr, hport->ep0, 0, hport->speed,
maxpacketsize);
/* Now read the full device descriptor (if we have not already done so) */
if (descsize < USB_SIZEOF_DEVDESC)
{
ctrlreq->type = USB_REQ_DIR_IN | USB_REQ_RECIPIENT_DEVICE;
ctrlreq->req = USB_REQ_GETDESCRIPTOR;
usbhost_putle16(ctrlreq->value, (USB_DESC_TYPE_DEVICE << 8));
usbhost_putle16(ctrlreq->index, 0);
usbhost_putle16(ctrlreq->len, USB_SIZEOF_DEVDESC);
ret = DRVR_CTRLIN(hport->drvr, hport->ep0, ctrlreq, buffer);
if (ret < 0)
{
uerr("ERROR: Failed to get device descriptor, length=%d: %d\n",
USB_SIZEOF_DEVDESC, ret);
goto errout;
}
}
/* Get class identification information from the device descriptor. Most
* devices set this to USB_CLASS_PER_INTERFACE (zero) and provide the
* identification information in the interface descriptor(s). That allows
* a device to support multiple, different classes.
*/
usbhost_devdesc((struct usb_devdesc_s *)buffer, &id);
/* Assign a function address to the device connected to this port */
funcaddr = usbhost_devaddr_create(hport);
if (funcaddr < 0)
{
uerr("ERROR: usbhost_devaddr_create failed: %d\n", ret);
goto errout;
}
/* Set the USB device address */
ctrlreq->type = USB_REQ_DIR_OUT | USB_REQ_RECIPIENT_DEVICE;
ctrlreq->req = USB_REQ_SETADDRESS;
usbhost_putle16(ctrlreq->value, (uint16_t)funcaddr);
usbhost_putle16(ctrlreq->index, 0);
usbhost_putle16(ctrlreq->len, 0);
ret = DRVR_CTRLOUT(hport->drvr, hport->ep0, ctrlreq, NULL);
if (ret < 0)
{
uerr("ERROR: Failed to set address: %d\n", ret);
goto errout;
}
nxsig_usleep(2 * 1000);
/* Assign the function address to the port */
DEBUGASSERT(hport->funcaddr == 0 && funcaddr != 0);
hport->funcaddr = funcaddr;
/* And reconfigure EP0 with the correct address */
DRVR_EP0CONFIGURE(hport->drvr, hport->ep0, hport->funcaddr,
hport->speed, maxpacketsize);
/* Get the configuration descriptor (only), index == 0. Should not be
* hard-coded! More logic is needed in order to handle devices with
* multiple configurations.
*/
ctrlreq->type = USB_REQ_DIR_IN | USB_REQ_RECIPIENT_DEVICE;
ctrlreq->req = USB_REQ_GETDESCRIPTOR;
usbhost_putle16(ctrlreq->value, (USB_DESC_TYPE_CONFIG << 8));
usbhost_putle16(ctrlreq->index, 0);
usbhost_putle16(ctrlreq->len, USB_SIZEOF_CFGDESC);
ret = DRVR_CTRLIN(hport->drvr, hport->ep0, ctrlreq, buffer);
if (ret < 0)
{
uerr("ERROR: Failed to get configuration descriptor, length=%d: %d\n",
USB_SIZEOF_CFGDESC, ret);
goto errout;
}
/* Extract the full size of the configuration data */
cfglen = (unsigned int)
usbhost_getle16(((struct usb_cfgdesc_s *)buffer)->totallen);
uinfo("sizeof config data: %d\n", cfglen);
if (cfglen > maxlen)
{
uerr("ERROR: Configuration doesn't fit in buffer, "
"length=%d, maxlen=%zu\n",
cfglen, maxlen);
ret = -E2BIG;
goto errout;
}
/* Get all of the configuration descriptor data, index == 0 (Should not be
* hard-coded!)
*/
ctrlreq->type = USB_REQ_DIR_IN | USB_REQ_RECIPIENT_DEVICE;
ctrlreq->req = USB_REQ_GETDESCRIPTOR;
usbhost_putle16(ctrlreq->value, (USB_DESC_TYPE_CONFIG << 8));
usbhost_putle16(ctrlreq->index, 0);
usbhost_putle16(ctrlreq->len, cfglen);
ret = DRVR_CTRLIN(hport->drvr, hport->ep0, ctrlreq, buffer);
if (ret < 0)
{
uerr("ERROR: Failed to get configuration descriptor, length=%d: %d\n",
cfglen, ret);
goto errout;
}
/* Select device configuration 1 (Should not be hard-coded!) */
ctrlreq->type = USB_REQ_DIR_OUT | USB_REQ_RECIPIENT_DEVICE;
ctrlreq->req = USB_REQ_SETCONFIGURATION;
usbhost_putle16(ctrlreq->value, 1);
usbhost_putle16(ctrlreq->index, 0);
usbhost_putle16(ctrlreq->len, 0);
ret = DRVR_CTRLOUT(hport->drvr, hport->ep0, ctrlreq, NULL);
if (ret < 0)
{
uerr("ERROR: Failed to set configuration: %d\n", ret);
goto errout;
}
/* Some devices may require some delay before initialization */
nxsig_usleep(100 * 1000);
/* Was the class identification information provided in the device
* descriptor? Or do we need to find it in the interface descriptor(s)?
*/
if (id.base == USB_CLASS_PER_INTERFACE)
{
/* Get the class identification information for this device from the
* interface descriptor(s). Hmmm.. More logic is need to handle the
* case of multiple interface descriptors.
*/
uint8_t ninterfaces = ((struct usb_cfgdesc_s *)buffer)->ninterfaces;
uint8_t ifnum = 0;
for (ifnum = 0; ifnum < ninterfaces; ifnum++)
{
uinfo("Parsing interface: %d\n", ifnum);
ret = usbhost_configdesc(buffer, cfglen, ifnum, &ifnum, &id);
if (ret < 0)
{
uerr("ERROR: usbhost_configdesc failed: %d\n", ret);
goto errout;
}
ret = usbhost_classbind(hport, buffer, cfglen, &id, devclass);
if (ret < 0)
{
uerr("ERROR: usbhost_classbind failed %d\n", ret);
}
ret = OK;
}
}
else
{
#ifdef CONFIG_USBHOST_COMPOSITE
/* Check if the device attached to the downstream port if a USB
* composite device and, if so, create the composite device wrapper
* and bind it to the HCD.
*
* usbhost_composite() will return a negated errno value is 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. We make no real distinction here.
*/
ret = usbhost_composite(hport, buffer, cfglen, &id, devclass);
if (ret >= 0)
{
uinfo("usbhost_composite has bound the composite device\n");
}
/* Apparently this is not a composite device */
else
#endif
{
/* Parse the configuration descriptor and bind to the class
* instance for the device. This needs to be the last thing
* done because the class driver will begin configuring the
* device.
*/
ret = usbhost_classbind(hport, buffer, cfglen, &id, devclass);
if (ret < 0)
{
uerr("ERROR: usbhost_classbind failed %d\n", ret);
}
}
}
errout:
if (ret < 0)
{
/* Release the device function address on any failure */
usbhost_devaddr_destroy(hport, funcaddr);
hport->funcaddr = 0;
}
/* Release temporary buffers in any event */
if (buffer != NULL)
{
DRVR_FREE(hport->drvr, buffer);
}
if (ctrlreq)
{
DRVR_FREE(hport->drvr, (FAR uint8_t *)ctrlreq);
}
return ret;
}
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