| [0a37e14] | 1 | /*
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| 2 | * Copyright (c) 2011 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 libusb
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * Standard USB requests (implementation).
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| 34 | */
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| 35 | #include <usb/request.h>
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| 36 | #include <usb/devreq.h>
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| 37 | #include <errno.h>
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| 38 |
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| 39 | /** Prepare setup packet.
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| 40 | *
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| 41 | * @param name Variable name with the setup packet.
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| 42 | * @param p_direction Data transfer direction.
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| 43 | * @param p_type Request type (standard/class/vendor)
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| 44 | * @param p_recipient Recipient of the request.
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| 45 | * @param p_request Request.
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| 46 | * @param p_value wValue field of setup packet.
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| 47 | * @param p_index wIndex field of setup packet.
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| 48 | * @param p_length Length of extra data.
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| 49 | */
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| 50 | #define PREPARE_SETUP_PACKET(name, p_direction, p_type, p_recipient, \
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| 51 | p_request, p_value, p_index, p_length) \
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| 52 | usb_device_request_setup_packet_t name = { \
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| 53 | .request_type = \
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| 54 | ((p_direction) == USB_DIRECTION_IN ? 128 : 0) \
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| 55 | | ((p_type) << 5) \
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| 56 | | (p_recipient), \
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| 57 | .request = (p_request), \
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| 58 | { .value = (p_value) }, \
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| 59 | .index = (p_index), \
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| 60 | .length = (p_length) \
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| 61 | }
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| 62 |
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| 63 | /** Prepare setup packet.
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| 64 | *
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| 65 | * @param name Variable name with the setup packet.
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| 66 | * @param p_direction Data transfer direction.
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| 67 | * @param p_type Request type (standard/class/vendor)
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| 68 | * @param p_recipient Recipient of the request.
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| 69 | * @param p_request Request.
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| 70 | * @param p_value_low wValue field of setup packet (low byte).
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| 71 | * @param p_value_high wValue field of setup packet (high byte).
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| 72 | * @param p_index wIndex field of setup packet.
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| 73 | * @param p_length Length of extra data.
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| 74 | */
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| 75 | #define PREPARE_SETUP_PACKET_LOHI(name, p_direction, p_type, p_recipient, \
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| 76 | p_request, p_value_low, p_value_high, p_index, p_length) \
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| 77 | PREPARE_SETUP_PACKET(name, p_direction, p_type, p_recipient, \
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| 78 | p_request, (p_value_low) | ((p_value_high) << 8), \
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| 79 | p_index, p_length)
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| 80 |
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| 81 |
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| 82 | /** Retrieve USB descriptor of a USB device.
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| 83 | *
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| 84 | * @param[in] pipe Control endpoint pipe (session must be already started).
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| 85 | * @param[in] request_type Request type (standard/class/vendor).
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| 86 | * @param[in] descriptor_type Descriptor type (device/configuration/HID/...).
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| 87 | * @param[in] descriptor_index Descriptor index.
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| 88 | * @param[in] language Language index.
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| 89 | * @param[out] buffer Buffer where to store the retrieved descriptor.
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| 90 | * @param[in] size Size of the @p buffer.
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| 91 | * @param[out] actual_size Number of bytes actually transferred.
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| 92 | * @return Error code.
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| 93 | */
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| 94 | int usb_request_get_descriptor(usb_endpoint_pipe_t *pipe,
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| 95 | usb_request_type_t request_type,
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| 96 | uint8_t descriptor_type, uint8_t descriptor_index,
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| 97 | uint16_t language,
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| 98 | void *buffer, size_t size, size_t *actual_size)
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| 99 | {
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| 100 | if (buffer == NULL) {
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| 101 | return EBADMEM;
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| 102 | }
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| 103 | if (size == 0) {
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| 104 | return EINVAL;
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| 105 | }
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| 106 |
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| 107 | PREPARE_SETUP_PACKET_LOHI(setup_packet, USB_DIRECTION_IN,
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| 108 | request_type, USB_REQUEST_RECIPIENT_DEVICE,
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| 109 | USB_DEVREQ_GET_DESCRIPTOR, descriptor_index, descriptor_type,
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| 110 | language, size);
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| 111 |
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| 112 | int rc = usb_endpoint_pipe_control_read(pipe,
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| 113 | &setup_packet, sizeof(setup_packet),
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| 114 | buffer, size, actual_size);
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| 115 |
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| 116 | return rc;
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| 117 | }
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| 118 |
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| 119 | /**
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| 120 | * @}
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| 121 | */
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