| [4971812] | 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 Preprocessing of standard device requests.
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| 34 | */
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| 35 | #include <errno.h>
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| 36 | #include <usb/devreq.h>
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| 37 |
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| 38 | #include "private.h"
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| 39 |
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| 40 | /*
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| 41 | * All sub handlers must return EFORWARD to inform the caller that
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| 42 | * they were not able to process the request (yes, it is abuse of
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| 43 | * this error code but such error code shall not collide with anything
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| 44 | * else in this context).
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| 45 | */
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| 46 |
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| 47 | static int handle_get_descriptor(uint8_t type, uint8_t index, uint16_t language,
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| 48 | uint16_t length)
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| 49 | {
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| 50 | /*
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| 51 | * Standard device descriptor.
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| 52 | */
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| 53 | if ((type == USB_DESCTYPE_DEVICE) && (index == 0)) {
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| 54 | if (device->standard_descriptor) {
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| 55 | return device->send_data(device, 0,
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| 56 | device->standard_descriptor,
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| 57 | device->standard_descriptor->length);
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| 58 | } else {
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| 59 | return EFORWARD;
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | return EFORWARD;
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| 64 | }
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| 65 |
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| 66 | static int handle_set_address(uint16_t new_address,
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| 67 | uint16_t zero1, uint16_t zero2)
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| 68 | {
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| 69 | if ((zero1 != 0) || (zero2 != 0)) {
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| 70 | return EINVAL;
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| 71 | }
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| 72 |
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| 73 | if (new_address > 127) {
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| 74 | return EINVAL;
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| 75 | }
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| 76 |
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| 77 | /*
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| 78 | * TODO: inform the HC that device has new address assigned.
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| 79 | */
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| 80 | return EOK;
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| 81 | }
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| 82 |
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| 83 | int handle_std_request(usb_direction_t direction, int recipient,
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| 84 | uint16_t request, uint16_t value, uint16_t index, uint16_t length,
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| 85 | uint8_t *remaining_data)
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| 86 | {
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| 87 | int rc;
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| 88 |
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| 89 | switch (request) {
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| 90 | case USB_DEVREQ_GET_DESCRIPTOR:
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| 91 | rc = handle_get_descriptor(value >> 8, (uint8_t) value,
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| 92 | index, length);
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| 93 | break;
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| 94 |
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| 95 | case USB_DEVREQ_SET_ADDRESS:
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| 96 | rc = handle_set_address(value, index, length);
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| 97 | break;
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| 98 |
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| 99 | default:
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| 100 | rc = EFORWARD;
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| 101 | break;
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| 102 | }
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| 103 |
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| 104 | /*
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| 105 | * We preprocessed all we could.
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| 106 | * If it was not enough, pass the request to the actual driver.
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| 107 | */
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| 108 | if (rc == EFORWARD) {
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| 109 | if (DEVICE_HAS_OP(device, on_devreq_std)) {
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| 110 | return device->ops->on_devreq_std(device, direction,
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| 111 | recipient,
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| 112 | request, value, index,
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| 113 | length, remaining_data);
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| 114 | }
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| 115 | }
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| 116 |
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| 117 | return EOK;
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| 118 | }
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| 119 |
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| 120 | /**
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| 121 | * @}
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| 122 | */
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