| 1 | /*
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| 2 | * Copyright (c) 2010 Vojtech Horky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libusbvirt usb
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * @brief Device control pipe.
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| 34 | */
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| 35 | #include <errno.h>
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| 36 |
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| 37 | #include "private.h"
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| 38 |
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| 39 | #define REQUEST_TYPE_STANDARD 0
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| 40 | #define REQUEST_TYPE_CLASS 1
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| 41 |
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| 42 | #define GET_MIDBITS_MASK(size, shift) \
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| 43 | (((1 << size) - 1) << shift)
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| 44 | #define GET_MIDBITS(value, size, shift) \
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| 45 | ((value & GET_MIDBITS_MASK(size, shift)) >> shift)
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| 46 |
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| 47 | static usb_direction_t request_get_direction(uint8_t request_type)
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| 48 | {
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| 49 | int bit7 = GET_MIDBITS(request_type, 1, 7);
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| 50 | return bit7 ? USB_DIRECTION_IN : USB_DIRECTION_OUT;
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| 51 | }
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| 52 |
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| 53 | static int request_get_type(uint8_t request_type)
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| 54 | {
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| 55 | return GET_MIDBITS(request_type, 2, 5);
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| 56 | }
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| 57 |
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| 58 | static int request_get_recipient(uint8_t request_type)
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| 59 | {
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| 60 | return GET_MIDBITS(request_type, 5, 0);
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| 61 | }
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| 62 |
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| 63 |
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| 64 | typedef struct {
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| 65 | uint8_t request_type;
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| 66 | uint8_t request;
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| 67 | uint16_t value;
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| 68 | uint16_t index;
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| 69 | uint16_t length;
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| 70 | } __attribute__ ((packed)) devreq_setup_packet_t;
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| 71 |
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| 72 | int control_pipe(void *buffer, size_t size)
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| 73 | {
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| 74 | if (size < sizeof(devreq_setup_packet_t)) {
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| 75 | return ENOMEM;
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| 76 | }
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| 77 |
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| 78 | devreq_setup_packet_t *request = (devreq_setup_packet_t *) buffer;
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| 79 | uint8_t *remaining_data = ((uint8_t *) request) + sizeof(devreq_setup_packet_t);
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| 80 |
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| 81 | usb_direction_t direction = request_get_direction(request->request_type);
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| 82 | int type = request_get_type(request->request_type);
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| 83 | int recipient = request_get_recipient(request->request_type);
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| 84 |
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| 85 |
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| 86 | switch (type) {
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| 87 | case REQUEST_TYPE_STANDARD:
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| 88 | return handle_std_request(direction, recipient,
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| 89 | request->request, request->value,
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| 90 | request->index, request->length,
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| 91 | remaining_data);
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| 92 | break;
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| 93 | case REQUEST_TYPE_CLASS:
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| 94 | if (DEVICE_HAS_OP(device, on_devreq_class)) {
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| 95 | return device->ops->on_devreq_class(device,
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| 96 | direction, recipient,
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| 97 | request->request, request->value,
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| 98 | request->index, request->length,
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| 99 | remaining_data);
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| 100 | }
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| 101 | break;
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| 102 | default:
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| 103 | break;
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| 104 | }
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| 105 |
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| 106 | return EOK;
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| 107 | }
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| 108 |
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| 109 | /**
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| 110 | * @}
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| 111 | */
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