source: mainline/uspace/lib/drv/generic/remote_char_dev.c@ af6b5157

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since af6b5157 was af6b5157, checked in by Jiri Svoboda <jiri@…>, 14 years ago

Split driver.h into ddf/driver.h and ddf/interrupt.h.

  • Property mode set to 100644
File size: 4.6 KB
RevLine 
[25a7e11d]1/*
[7a252ec8]2 * Copyright (c) 2010 Lenka Trochtova
[25a7e11d]3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libdrv
30 * @{
31 */
32/** @file
33 */
34
35#include <async.h>
36#include <errno.h>
37
[41b56084]38#include "ops/char_dev.h"
[af6b5157]39#include "ddf/driver.h"
[25a7e11d]40
41#define MAX_CHAR_RW_COUNT 256
42
[83a2f43]43static void remote_char_read(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
44static void remote_char_write(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
[25a7e11d]45
[7a252ec8]46/** Remote character interface operations. */
[50c57df]47static remote_iface_func_ptr_t remote_char_dev_iface_ops[] = {
[25a7e11d]48 &remote_char_read,
[7a252ec8]49 &remote_char_write
50};
51
52/** Remote character interface structure.
53 *
54 * Interface for processing request from remote clients addressed to the
55 * character interface.
[ca97cad]56 */
[50c57df]57remote_iface_t remote_char_dev_iface = {
58 .method_count = sizeof(remote_char_dev_iface_ops) /
[7a252ec8]59 sizeof(remote_iface_func_ptr_t),
[50c57df]60 .methods = remote_char_dev_iface_ops
[25a7e11d]61};
62
[ca97cad]63/** Process the read request from the remote client.
[7a252ec8]64 *
65 * Receive the read request's parameters from the remote client and pass them
66 * to the local interface. Return the result of the operation processed by the
67 * local interface to the remote client.
68 *
[8b1e15ac]69 * @param fun The function from which the data are read.
[d35ac1d]70 * @param ops The local ops structure.
[ca97cad]71 */
[7a252ec8]72static void
[83a2f43]73remote_char_read(ddf_fun_t *fun, void *ops, ipc_callid_t callid,
[7a252ec8]74 ipc_call_t *call)
[ce79069b]75{
[d35ac1d]76 char_dev_ops_t *char_dev_ops = (char_dev_ops_t *) ops;
[ba95e8f]77 ipc_callid_t cid;
[25a7e11d]78
79 size_t len;
[ba95e8f]80 if (!async_data_read_receive(&cid, &len)) {
[7a252ec8]81 /* TODO handle protocol error. */
[ffa2c8ef]82 async_answer_0(callid, EINVAL);
[f658458]83 return;
84 }
85
[d35ac1d]86 if (!char_dev_ops->read) {
[ba95e8f]87 async_data_read_finalize(cid, NULL, 0);
[ffa2c8ef]88 async_answer_0(callid, ENOTSUP);
[25a7e11d]89 return;
90 }
91
[7a252ec8]92 if (len > MAX_CHAR_RW_COUNT)
[25a7e11d]93 len = MAX_CHAR_RW_COUNT;
94
95 char buf[MAX_CHAR_RW_COUNT];
[8b1e15ac]96 int ret = (*char_dev_ops->read)(fun, buf, len);
[25a7e11d]97
[7a252ec8]98 if (ret < 0) {
99 /* Some error occured. */
[ba95e8f]100 async_data_read_finalize(cid, buf, 0);
[ffa2c8ef]101 async_answer_0(callid, ret);
[25a7e11d]102 return;
103 }
104
[7a252ec8]105 /* The operation was successful, return the number of data read. */
[ba95e8f]106 async_data_read_finalize(cid, buf, ret);
[ffa2c8ef]107 async_answer_1(callid, EOK, ret);
[25a7e11d]108}
109
[ca97cad]110/** Process the write request from the remote client.
[7a252ec8]111 *
112 * Receive the write request's parameters from the remote client and pass them
113 * to the local interface. Return the result of the operation processed by the
114 * local interface to the remote client.
115 *
[8b1e15ac]116 * @param fun The function to which the data are written.
[d35ac1d]117 * @param ops The local ops structure.
[ca97cad]118 */
[7a252ec8]119static void
[83a2f43]120remote_char_write(ddf_fun_t *fun, void *ops, ipc_callid_t callid,
[7a252ec8]121 ipc_call_t *call)
[25a7e11d]122{
[d35ac1d]123 char_dev_ops_t *char_dev_ops = (char_dev_ops_t *) ops;
[ca97cad]124 ipc_callid_t cid;
[25a7e11d]125 size_t len;
[ca97cad]126
127 if (!async_data_write_receive(&cid, &len)) {
[7a252ec8]128 /* TODO handle protocol error. */
[ffa2c8ef]129 async_answer_0(callid, EINVAL);
[25a7e11d]130 return;
[7a252ec8]131 }
[25a7e11d]132
[d35ac1d]133 if (!char_dev_ops->write) {
[ca97cad]134 async_data_write_finalize(cid, NULL, 0);
[ffa2c8ef]135 async_answer_0(callid, ENOTSUP);
[ca97cad]136 return;
[ce79069b]137 }
[ca97cad]138
[7a252ec8]139 if (len > MAX_CHAR_RW_COUNT)
[25a7e11d]140 len = MAX_CHAR_RW_COUNT;
141
142 char buf[MAX_CHAR_RW_COUNT];
143
[ca97cad]144 async_data_write_finalize(cid, buf, len);
[25a7e11d]145
[8b1e15ac]146 int ret = (*char_dev_ops->write)(fun, buf, len);
[7a252ec8]147 if (ret < 0) {
148 /* Some error occured. */
[ffa2c8ef]149 async_answer_0(callid, ret);
[25a7e11d]150 } else {
[7a252ec8]151 /*
152 * The operation was successful, return the number of data
153 * written.
154 */
[ffa2c8ef]155 async_answer_1(callid, EOK, ret);
[25a7e11d]156 }
157}
158
[7a252ec8]159/**
[25a7e11d]160 * @}
[7a252ec8]161 */
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