| 1 | /*
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| 2 | * Copyright (c) 2011 Jan Vesely
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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 | #include <errno.h>
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| 30 | #include <mem.h>
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| 31 | #include <ipc/dev_iface.h>
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| 32 | #include <ddf/log.h>
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| 33 |
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| 34 | #include "chardev.h"
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| 35 |
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| 36 | // TODO make this shared
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| 37 | enum {
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| 38 | IPC_CHAR_READ = DEV_FIRST_CUSTOM_METHOD,
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| 39 | IPC_CHAR_WRITE,
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| 40 | };
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| 41 |
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| 42 | ssize_t chardev_read(async_exch_t *exch, void *data, size_t size)
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| 43 | {
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| 44 | if (!exch)
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| 45 | return EBADMEM;
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| 46 | if (size > 4 * sizeof(sysarg_t))
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| 47 | return ELIMIT;
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| 48 |
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| 49 | sysarg_t message[4] = { 0 };
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| 50 | const ssize_t ret = async_req_1_4(exch, IPC_CHAR_READ, size,
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| 51 | &message[0], &message[1], &message[2], &message[3]);
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| 52 | if (ret > 0 && (size_t)ret <= size)
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| 53 | memcpy(data, message, size);
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| 54 | return ret;
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| 55 | }
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| 56 |
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| 57 | ssize_t chardev_write(async_exch_t *exch, const void *data, size_t size)
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| 58 | {
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| 59 | if (!exch)
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| 60 | return EBADMEM;
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| 61 | if (size > 3 * sizeof(sysarg_t))
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| 62 | return ELIMIT;
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| 63 |
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| 64 | sysarg_t message[3] = { 0 };
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| 65 | memcpy(message, data, size);
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| 66 | return async_req_4_0(exch, IPC_CHAR_WRITE, size,
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| 67 | message[0], message[1], message[2]);
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| 68 | }
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