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1// SPDX-License-Identifier: GPL-2.0
2// test ir decoder
3//
4// Copyright (C) 2018 Sean Young <[email protected]>
5
6// When sending LIRC_MODE_SCANCODE, the IR will be encoded. rc-loopback
7// will send this IR to the receiver side, where we try to read the decoded
8// IR. Decoding happens in a separate kernel thread, so we will need to
9// wait until that is scheduled, hence we use poll to check for read
10// readiness.
11
12#include <linux/lirc.h>
13#include <errno.h>
14#include <stdio.h>
15#include <stdlib.h>
16#include <stdbool.h>
17#include <string.h>
18#include <unistd.h>
19#include <poll.h>
20#include <time.h>
21#include <sys/types.h>
22#include <sys/ioctl.h>
23#include <dirent.h>
24#include <sys/stat.h>
25#include <fcntl.h>
26#include "kselftest.h"
27
28#define TEST_SCANCODES 10
29#define SYSFS_PATH_MAX 256
30#define DNAME_PATH_MAX 256
31
32/*
33 * Support ancient lirc.h which does not have these values. Can be removed
34 * once RHEL 8 is no longer a relevant testing platform.
35 */
36#if RC_PROTO_MAX < 26
37#define RC_PROTO_RCMM12 24
38#define RC_PROTO_RCMM24 25
39#define RC_PROTO_RCMM32 26
40#endif
41
42static const struct {
43 enum rc_proto proto;
44 const char *name;
45 unsigned int mask;
46 const char *decoder;
47} protocols[] = {
48 { RC_PROTO_RC5, "rc-5", 0x1f7f, "rc-5" },
49 { RC_PROTO_RC5X_20, "rc-5x-20", 0x1f7f3f, "rc-5" },
50 { RC_PROTO_RC5_SZ, "rc-5-sz", 0x2fff, "rc-5-sz" },
51 { RC_PROTO_JVC, "jvc", 0xffff, "jvc" },
52 { RC_PROTO_SONY12, "sony-12", 0x1f007f, "sony" },
53 { RC_PROTO_SONY15, "sony-15", 0xff007f, "sony" },
54 { RC_PROTO_SONY20, "sony-20", 0x1fff7f, "sony" },
55 { RC_PROTO_NEC, "nec", 0xffff, "nec" },
56 { RC_PROTO_NECX, "nec-x", 0xffffff, "nec" },
57 { RC_PROTO_NEC32, "nec-32", 0xffffffff, "nec" },
58 { RC_PROTO_SANYO, "sanyo", 0x1fffff, "sanyo" },
59 { RC_PROTO_RC6_0, "rc-6-0", 0xffff, "rc-6" },
60 { RC_PROTO_RC6_6A_20, "rc-6-6a-20", 0xfffff, "rc-6" },
61 { RC_PROTO_RC6_6A_24, "rc-6-6a-24", 0xffffff, "rc-6" },
62 { RC_PROTO_RC6_6A_32, "rc-6-6a-32", 0xffffffff, "rc-6" },
63 { RC_PROTO_RC6_MCE, "rc-6-mce", 0x00007fff, "rc-6" },
64 { RC_PROTO_SHARP, "sharp", 0x1fff, "sharp" },
65 { RC_PROTO_IMON, "imon", 0x7fffffff, "imon" },
66 { RC_PROTO_RCMM12, "rcmm-12", 0x00000fff, "rc-mm" },
67 { RC_PROTO_RCMM24, "rcmm-24", 0x00ffffff, "rc-mm" },
68 { RC_PROTO_RCMM32, "rcmm-32", 0xffffffff, "rc-mm" },
69};
70
71int lirc_open(const char *rc)
72{
73 struct dirent *dent;
74 char buf[SYSFS_PATH_MAX + DNAME_PATH_MAX];
75 DIR *d;
76 int fd;
77
78 snprintf(buf, sizeof(buf), "/sys/class/rc/%s", rc);
79
80 d = opendir(buf);
81 if (!d)
82 ksft_exit_fail_msg("cannot open %s: %m\n", buf);
83
84 while ((dent = readdir(d)) != NULL) {
85 if (!strncmp(dent->d_name, "lirc", 4)) {
86 snprintf(buf, sizeof(buf), "/dev/%s", dent->d_name);
87 break;
88 }
89 }
90
91 if (!dent)
92 ksft_exit_skip("cannot find lirc device for %s\n", rc);
93
94 closedir(d);
95
96 fd = open(buf, O_RDWR | O_NONBLOCK);
97 if (fd == -1)
98 ksft_exit_fail_msg("cannot open: %s: %m\n", buf);
99
100 return fd;
101}
102
103int main(int argc, char **argv)
104{
105 unsigned int mode;
106 char buf[100];
107 int rlircfd, wlircfd, protocolfd, i, n;
108
109 srand(time(NULL));
110
111 if (argc != 3)
112 ksft_exit_fail_msg("Usage: %s <write rcN> <read rcN>\n",
113 argv[0]);
114
115 rlircfd = lirc_open(argv[2]);
116 mode = LIRC_MODE_SCANCODE;
117 if (ioctl(rlircfd, LIRC_SET_REC_MODE, &mode))
118 ksft_exit_fail_msg("failed to set scancode rec mode %s: %m\n",
119 argv[2]);
120
121 wlircfd = lirc_open(argv[1]);
122 if (ioctl(wlircfd, LIRC_SET_SEND_MODE, &mode))
123 ksft_exit_fail_msg("failed to set scancode send mode %s: %m\n",
124 argv[1]);
125
126 snprintf(buf, sizeof(buf), "/sys/class/rc/%s/protocols", argv[2]);
127 protocolfd = open(buf, O_WRONLY);
128 if (protocolfd == -1)
129 ksft_exit_fail_msg("failed to open %s: %m\n", buf);
130
131 printf("Sending IR on %s and receiving IR on %s.\n", argv[1], argv[2]);
132
133 for (i = 0; i < ARRAY_SIZE(protocols); i++) {
134 if (write(protocolfd, protocols[i].decoder,
135 strlen(protocols[i].decoder)) == -1)
136 ksft_exit_fail_msg("failed to set write decoder\n");
137
138 printf("Testing protocol %s for decoder %s (%d/%d)...\n",
139 protocols[i].name, protocols[i].decoder,
140 i + 1, (int)ARRAY_SIZE(protocols));
141
142 for (n = 0; n < TEST_SCANCODES; n++) {
143 unsigned int scancode = rand() & protocols[i].mask;
144 unsigned int rc_proto = protocols[i].proto;
145
146 if (rc_proto == RC_PROTO_RC6_MCE)
147 scancode |= 0x800f0000;
148
149 if (rc_proto == RC_PROTO_NECX &&
150 (((scancode >> 16) ^ ~(scancode >> 8)) & 0xff) == 0)
151 continue;
152
153 if (rc_proto == RC_PROTO_NEC32 &&
154 (((scancode >> 8) ^ ~scancode) & 0xff) == 0)
155 continue;
156
157 if (rc_proto == RC_PROTO_RCMM32 &&
158 (scancode & 0x000c0000) != 0x000c0000 &&
159 scancode & 0x00008000)
160 continue;
161
162 struct lirc_scancode lsc = {
163 .rc_proto = rc_proto,
164 .scancode = scancode
165 };
166
167 printf("Testing scancode:%x\n", scancode);
168
169 while (write(wlircfd, &lsc, sizeof(lsc)) < 0) {
170 if (errno == EINTR)
171 continue;
172
173 ksft_exit_fail_msg("failed to send ir: %m\n");
174 }
175
176 struct pollfd pfd = { .fd = rlircfd, .events = POLLIN };
177 struct lirc_scancode lsc2;
178
179 poll(&pfd, 1, 1000);
180
181 bool decoded = true;
182
183 while (read(rlircfd, &lsc2, sizeof(lsc2)) < 0) {
184 if (errno == EINTR)
185 continue;
186
187 ksft_test_result_error("no scancode decoded: %m\n");
188 decoded = false;
189 break;
190 }
191
192 if (!decoded)
193 continue;
194
195 if (lsc.rc_proto != lsc2.rc_proto)
196 ksft_test_result_error("decoded protocol is different: %d\n",
197 lsc2.rc_proto);
198
199 else if (lsc.scancode != lsc2.scancode)
200 ksft_test_result_error("decoded scancode is different: %llx\n",
201 lsc2.scancode);
202 else
203 ksft_inc_pass_cnt();
204 }
205
206 printf("OK\n");
207 }
208
209 close(rlircfd);
210 close(wlircfd);
211 close(protocolfd);
212
213 if (ksft_get_fail_cnt() > 0)
214 ksft_exit_fail();
215 else
216 ksft_exit_pass();
217
218 return 0;
219}