| 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 libusbdev
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * Library internal functions on USB pipes (implementation).
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| 34 | */
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| 35 | #include "pipepriv.h"
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| 36 | #include <devman.h>
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| 37 | #include <errno.h>
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| 38 | #include <assert.h>
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| 39 |
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| 40 | /** Ensure exclusive access to the IPC phone of given pipe.
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| 41 | *
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| 42 | * @param pipe Pipe to be exclusively accessed.
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| 43 | */
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| 44 | void pipe_start_transaction(usb_pipe_t *pipe)
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| 45 | {
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| 46 | fibril_mutex_lock(&pipe->hc_sess_mutex);
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| 47 | }
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| 48 |
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| 49 | /** Terminate exclusive access to the IPC phone of given pipe.
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| 50 | *
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| 51 | * @param pipe Pipe to be released from exclusive usage.
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| 52 | */
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| 53 | void pipe_end_transaction(usb_pipe_t *pipe)
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| 54 | {
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| 55 | fibril_mutex_unlock(&pipe->hc_sess_mutex);
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| 56 | }
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| 57 |
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| 58 | /** Ensure exclusive access to the pipe as a whole.
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| 59 | *
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| 60 | * @param pipe Pipe to be exclusively accessed.
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| 61 | */
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| 62 | void pipe_acquire(usb_pipe_t *pipe)
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| 63 | {
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| 64 | fibril_mutex_lock(&pipe->guard);
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| 65 | }
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| 66 |
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| 67 | /** Terminate exclusive access to the pipe as a whole.
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| 68 | *
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| 69 | * @param pipe Pipe to be released from exclusive usage.
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| 70 | */
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| 71 | void pipe_release(usb_pipe_t *pipe)
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| 72 | {
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| 73 | fibril_mutex_unlock(&pipe->guard);
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| 74 | }
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| 75 |
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| 76 | /** Add reference of active transfers over the pipe.
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| 77 | *
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| 78 | * @param pipe The USB pipe.
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| 79 | * @param hide_failure Whether to hide failure when adding reference
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| 80 | * (use soft refcount).
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| 81 | * @return Error code.
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| 82 | * @retval EOK Currently always.
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| 83 | */
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| 84 | int pipe_add_ref(usb_pipe_t *pipe, bool hide_failure)
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| 85 | {
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| 86 | pipe_acquire(pipe);
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| 87 |
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| 88 | if (pipe->refcount == 0) {
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| 89 | assert(pipe->hc_sess == NULL);
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| 90 | /* Need to open the phone by ourselves. */
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| 91 | async_sess_t *sess =
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| 92 | devman_device_connect(EXCHANGE_SERIALIZE, pipe->wire->hc_connection->hc_handle, 0);
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| 93 | if (!sess) {
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| 94 | if (hide_failure) {
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| 95 | pipe->refcount_soft++;
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| 96 | pipe_release(pipe);
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| 97 | return EOK;
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| 98 | }
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| 99 |
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| 100 | pipe_release(pipe);
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| 101 | return ENOMEM;
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| 102 | }
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| 103 |
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| 104 | /*
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| 105 | * No locking is needed, refcount is zero and whole pipe
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| 106 | * mutex is locked.
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| 107 | */
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| 108 |
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| 109 | pipe->hc_sess = sess;
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| 110 | }
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| 111 |
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| 112 | pipe->refcount++;
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| 113 | pipe_release(pipe);
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| 114 |
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| 115 | return EOK;
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| 116 | }
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| 117 |
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| 118 | /** Drop active transfer reference on the pipe.
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| 119 | *
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| 120 | * @param pipe The USB pipe.
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| 121 | */
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| 122 | void pipe_drop_ref(usb_pipe_t *pipe)
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| 123 | {
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| 124 | pipe_acquire(pipe);
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| 125 |
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| 126 | if (pipe->refcount_soft > 0) {
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| 127 | pipe->refcount_soft--;
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| 128 | pipe_release(pipe);
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| 129 | return;
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| 130 | }
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| 131 |
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| 132 | assert(pipe->refcount > 0);
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| 133 |
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| 134 | pipe->refcount--;
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| 135 |
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| 136 | if (pipe->refcount == 0) {
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| 137 | /* We were the last users, let's hang-up. */
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| 138 | async_hangup(pipe->hc_sess);
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| 139 | pipe->hc_sess = NULL;
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| 140 | }
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| 141 |
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| 142 | pipe_release(pipe);
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| 143 | }
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| 144 |
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| 145 |
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| 146 | /**
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| 147 | * @}
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| 148 | */
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