usb_hid.c

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/* $FreeBSD$ */
/*      $NetBSD: hid.c,v 1.17 2001/11/13 06:24:53 lukem Exp $   */
/*-
 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
 *
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart@augustsson.net) at
 * Carlstedt Research & Technology.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */
 
#ifdef USB_GLOBAL_INCLUDE_FILE
#include USB_GLOBAL_INCLUDE_FILE
#else
#include <sys/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/priv.h>
 
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbhid.h>
 
#define USB_DEBUG_VAR usb_debug
 
#include <dev/usb/usb_core.h>
#include <dev/usb/usb_debug.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_device.h>
#include <dev/usb/usb_request.h>
#endif                  /* USB_GLOBAL_INCLUDE_FILE */
 
/*------------------------------------------------------------------------*
 *      hid_get_descriptor_from_usb
 *
 * This function will search for a HID descriptor between two USB
 * interface descriptors.
 *
 * Return values:
 * NULL: No more HID descriptors.
 * Else: Pointer to HID descriptor.
 *------------------------------------------------------------------------*/
struct usb_hid_descriptor *
hid_get_descriptor_from_usb(struct usb_config_descriptor *cd,
    struct usb_interface_descriptor *id)
{
        struct usb_descriptor *desc = (void *)id;
 
        if (desc == NULL) {
                return (NULL);
        }
        while ((desc = usb_desc_foreach(cd, desc))) {
                if ((desc->bDescriptorType == UDESC_HID) &&
                    (desc->bLength >= USB_HID_DESCRIPTOR_SIZE(0))) {
                        return (void *)desc;
                }
                if (desc->bDescriptorType == UDESC_INTERFACE) {
                        break;
                }
        }
        return (NULL);
}
 
/*------------------------------------------------------------------------*
 *      usbd_req_get_hid_desc
 *
 * This function will read out an USB report descriptor from the USB
 * device.
 *
 * Return values:
 * NULL: Failure.
 * Else: Success. The pointer should eventually be passed to free().
 *------------------------------------------------------------------------*/
usb_error_t
usbd_req_get_hid_desc(struct usb_device *udev, struct mtx *mtx,
    void **descp, uint16_t *sizep,
    struct malloc_type *mem, uint8_t iface_index)
{
        struct usb_interface *iface = usbd_get_iface(udev, iface_index);
        struct usb_hid_descriptor *hid;
        usb_error_t err;
 
        if ((iface == NULL) || (iface->idesc == NULL)) {
                return (USB_ERR_INVAL);
        }
        hid = hid_get_descriptor_from_usb
            (usbd_get_config_descriptor(udev), iface->idesc);
 
        if (hid == NULL) {
                return (USB_ERR_IOERROR);
        }
        *sizep = UGETW(hid->descrs[0].wDescriptorLength);
        if (*sizep == 0) {
                return (USB_ERR_IOERROR);
        }
        if (mtx)
                mtx_unlock(mtx);
 
        *descp = malloc(*sizep, mem, M_ZERO | M_WAITOK);
 
        if (mtx)
                mtx_lock(mtx);
 
        if (*descp == NULL) {
                return (USB_ERR_NOMEM);
        }
        err = usbd_req_get_report_descriptor
            (udev, mtx, *descp, *sizep, iface_index);
 
        if (err) {
                free(*descp, mem);
                *descp = NULL;
                return (err);
        }
        return (USB_ERR_NORMAL_COMPLETION);
}