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nuttx/drivers/usbhost/usbhost_enumerate.c

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/*******************************************************************************
* drivers/usbhost/usbhost_enumerate.c
*
* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*******************************************************************************/
/*******************************************************************************
* 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/usb/usb.h>
#include <nuttx/usb/usbhost.h>
/*******************************************************************************
* Pre-processor Definitions
*******************************************************************************/
/*******************************************************************************
* Private Types
*******************************************************************************/
/*******************************************************************************
* 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,
struct usbhost_id_s *id);
static inline int usbhost_configdesc(const uint8_t *configdesc, int desclen,
struct usbhost_id_s *id);
static inline int usbhost_classbind(FAR struct usbhost_driver_s *drvr,
const uint8_t *configdesc, int desclen,
struct usbhost_id_s *id, uint8_t funcaddr,
FAR struct usbhost_class_s **usbclass);
/*******************************************************************************
* Private Data
*******************************************************************************/
/*******************************************************************************
* Public Data
*******************************************************************************/
/*******************************************************************************
* 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 specfic devices) */
id->vid = usbhost_getle16(devdesc->vendor);
id->pid = usbhost_getle16(devdesc->product);
uvdbg("class:%d subclass:%04x protocol:%04x vid:%d pid:%d\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,
struct usbhost_id_s *id)
{
struct usb_cfgdesc_s *cfgdesc;
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;
uvdbg("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)
{
/* 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;
uvdbg("class:%d subclass:%d protocol:%d\n",
id->base, id->subclass, id->proto);
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_driver_s *drvr,
const uint8_t *configdesc, int desclen,
struct usbhost_id_s *id, uint8_t funcaddr,
FAR struct usbhost_class_s **usbclass)
{
FAR struct usbhost_class_s *devclass;
const struct usbhost_registry_s *reg;
int ret = -EINVAL;
/* Is there is a class implementation registered to support this device. */
reg = usbhost_findclass(id);
uvdbg("usbhost_findclass: %p\n", reg);
if (reg)
{
/* Yes.. there is a class for this device. Get an instance of
* its interface.
*/
ret = -ENOMEM;
devclass = CLASS_CREATE(reg, drvr, id);
uvdbg("CLASS_CREATE: %p\n", devclass);
if (devclass)
{
/* Then bind the newly instantiated class instance */
ret = CLASS_CONNECT(devclass, configdesc, desclen, funcaddr);
if (ret != OK)
{
/* On failures, call the class disconnect method which
* should then free the allocated devclass instance.
*/
udbg("CLASS_CONNECT failed: %d\n", ret);
CLASS_DISCONNECTED(devclass);
}
else
{
*usbclass = devclass;
}
}
}
uvdbg("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:
* drvr - The USB host driver instance obtained as a parameter from the call to
* the class create() method.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
* usbclass - If the class driver for the device is successful located
* and bound to the driver, the allocated class instance is returned into
* this caller-provided memory location.
*
* Returned Values:
* 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_driver_s *drvr, uint8_t funcaddr,
FAR struct usbhost_class_s **usbclass)
{
struct usb_ctrlreq_s *ctrlreq;
struct usbhost_devinfo_s devinfo;
struct usbhost_id_s id;
size_t maxlen;
unsigned int cfglen;
uint8_t maxpacketsize;
uint8_t descsize;
uint8_t *buffer;
int ret;
DEBUGASSERT(drvr && usbclass);
/* 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(drvr, (FAR uint8_t **)&ctrlreq, &maxlen);
if (ret != OK)
{
udbg("DRVR_ALLOC failed: %d\n", ret);
return ret;
}
ret = DRVR_ALLOC(drvr, &buffer, &maxlen);
if (ret != OK)
{
udbg("DRVR_ALLOC failed: %d\n", ret);
goto errout;
}
/* Get information about the connected device */
ret = DRVR_GETDEVINFO(drvr, &devinfo);
if (ret != OK)
{
udbg("DRVR_GETDEVINFO 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 (devinfo.speed == DEVINFO_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;
}
/* Set the initial maximum packet size */
DRVR_EP0CONFIGURE(drvr, 0, 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(drvr, ctrlreq, buffer);
if (ret != OK)
{
udbg("ERROR: GETDESCRIPTOR/DEVICE, DRVR_CTRLIN returned %d\n", ret);
goto errout;
}
/* Extract the correct max packetsize from the device descriptor */
maxpacketsize = ((struct usb_devdesc_s *)buffer)->mxpacketsize;
uvdbg("maxpacksetsize: %d\n", maxpacketsize);
/* And reconfigure EP0 */
DRVR_EP0CONFIGURE(drvr, 0, 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(drvr, ctrlreq, buffer);
if (ret != OK)
{
udbg("ERROR: GETDESCRIPTOR/DEVICE, DRVR_CTRLIN returned %d\n",
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.
*/
(void)usbhost_devdesc((struct usb_devdesc_s *)buffer, &id);
/* Set the USB device address to the value in the 'funcaddr' input */
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(drvr, ctrlreq, NULL);
if (ret != OK)
{
udbg("ERROR: SETADDRESS DRVR_CTRLOUT returned %d\n", ret);
goto errout;
}
usleep(2*1000);
/* Modify control pipe with the provided USB device address */
DRVR_EP0CONFIGURE(drvr, funcaddr, 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(drvr, ctrlreq, buffer);
if (ret != OK)
{
udbg("ERROR: GETDESCRIPTOR/CONFIG, DRVR_CTRLIN returned %d\n", ret);
goto errout;
}
/* Extract the full size of the configuration data */
cfglen = (unsigned int)usbhost_getle16(((struct usb_cfgdesc_s *)buffer)->totallen);
uvdbg("sizeof config data: %d\n", cfglen);
/* 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(drvr, ctrlreq, buffer);
if (ret != OK)
{
udbg("ERROR: GETDESCRIPTOR/CONFIG, DRVR_CTRLIN returned %d\n", 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(drvr, ctrlreq, NULL);
if (ret != OK)
{
udbg("ERROR: SETCONFIGURATION, DRVR_CTRLOUT returned %d\n", ret);
goto errout;
}
/* Free the descriptor buffer that we were using for the request buffer.
* It is not needed further here but it may be needed by the class driver
* during its connection operations.
*/
DRVR_FREE(drvr, (uint8_t*)ctrlreq);
ctrlreq = NULL;
/* 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.
*/
ret = usbhost_configdesc(buffer, cfglen, &id);
if (ret != OK)
{
udbg("ERROR: usbhost_configdesc returned %d\n", ret);
goto errout;
}
}
/* Some devices may require some delay before initialization */
usleep(100*1000);
/* 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(drvr, buffer, cfglen, &id, funcaddr, usbclass);
if (ret != OK)
{
udbg("ERROR: usbhost_classbind returned %d\n", ret);
}
errout:
if (buffer)
{
DRVR_FREE(drvr, buffer);
}
if (ctrlreq)
{
DRVR_FREE(drvr, (uint8_t*)ctrlreq);
}
return ret;
}
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