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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c54ea491 AO |
2 | /* |
3 | * Hidraw Userspace Example | |
4 | * | |
5 | * Copyright (c) 2010 Alan Ott <alan@signal11.us> | |
6 | * Copyright (c) 2010 Signal 11 Software | |
7 | * | |
8 | * The code may be used by anyone for any purpose, | |
9 | * and can serve as a starting point for developing | |
10 | * applications using hidraw. | |
11 | */ | |
12 | ||
13 | /* Linux */ | |
14 | #include <linux/types.h> | |
15 | #include <linux/input.h> | |
16 | #include <linux/hidraw.h> | |
17 | ||
cb3e85fe JK |
18 | /* |
19 | * Ugly hack to work around failing compilation on systems that don't | |
20 | * yet populate new version of hidraw.h to userspace. | |
cb3e85fe JK |
21 | */ |
22 | #ifndef HIDIOCSFEATURE | |
f3713053 | 23 | #warning Please have your distro update the userspace kernel headers |
cb3e85fe JK |
24 | #define HIDIOCSFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len) |
25 | #define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len) | |
26 | #endif | |
27 | ||
c54ea491 AO |
28 | /* Unix */ |
29 | #include <sys/ioctl.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/stat.h> | |
32 | #include <fcntl.h> | |
33 | #include <unistd.h> | |
34 | ||
35 | /* C */ | |
36 | #include <stdio.h> | |
37 | #include <string.h> | |
38 | #include <stdlib.h> | |
39 | #include <errno.h> | |
40 | ||
41 | const char *bus_str(int bus); | |
42 | ||
43 | int main(int argc, char **argv) | |
44 | { | |
45 | int fd; | |
46 | int i, res, desc_size = 0; | |
47 | char buf[256]; | |
48 | struct hidraw_report_descriptor rpt_desc; | |
49 | struct hidraw_devinfo info; | |
04303f8e PM |
50 | char *device = "/dev/hidraw0"; |
51 | ||
52 | if (argc > 1) | |
53 | device = argv[1]; | |
c54ea491 AO |
54 | |
55 | /* Open the Device with non-blocking reads. In real life, | |
56 | don't use a hard coded path; use libudev instead. */ | |
04303f8e | 57 | fd = open(device, O_RDWR|O_NONBLOCK); |
c54ea491 AO |
58 | |
59 | if (fd < 0) { | |
60 | perror("Unable to open device"); | |
61 | return 1; | |
62 | } | |
63 | ||
64 | memset(&rpt_desc, 0x0, sizeof(rpt_desc)); | |
65 | memset(&info, 0x0, sizeof(info)); | |
66 | memset(buf, 0x0, sizeof(buf)); | |
67 | ||
68 | /* Get Report Descriptor Size */ | |
69 | res = ioctl(fd, HIDIOCGRDESCSIZE, &desc_size); | |
70 | if (res < 0) | |
71 | perror("HIDIOCGRDESCSIZE"); | |
72 | else | |
73 | printf("Report Descriptor Size: %d\n", desc_size); | |
74 | ||
75 | /* Get Report Descriptor */ | |
76 | rpt_desc.size = desc_size; | |
77 | res = ioctl(fd, HIDIOCGRDESC, &rpt_desc); | |
78 | if (res < 0) { | |
79 | perror("HIDIOCGRDESC"); | |
80 | } else { | |
81 | printf("Report Descriptor:\n"); | |
82 | for (i = 0; i < rpt_desc.size; i++) | |
83 | printf("%hhx ", rpt_desc.value[i]); | |
84 | puts("\n"); | |
85 | } | |
86 | ||
87 | /* Get Raw Name */ | |
88 | res = ioctl(fd, HIDIOCGRAWNAME(256), buf); | |
89 | if (res < 0) | |
90 | perror("HIDIOCGRAWNAME"); | |
91 | else | |
92 | printf("Raw Name: %s\n", buf); | |
93 | ||
94 | /* Get Physical Location */ | |
95 | res = ioctl(fd, HIDIOCGRAWPHYS(256), buf); | |
96 | if (res < 0) | |
97 | perror("HIDIOCGRAWPHYS"); | |
98 | else | |
99 | printf("Raw Phys: %s\n", buf); | |
100 | ||
101 | /* Get Raw Info */ | |
102 | res = ioctl(fd, HIDIOCGRAWINFO, &info); | |
103 | if (res < 0) { | |
104 | perror("HIDIOCGRAWINFO"); | |
105 | } else { | |
106 | printf("Raw Info:\n"); | |
107 | printf("\tbustype: %d (%s)\n", | |
108 | info.bustype, bus_str(info.bustype)); | |
109 | printf("\tvendor: 0x%04hx\n", info.vendor); | |
110 | printf("\tproduct: 0x%04hx\n", info.product); | |
111 | } | |
112 | ||
113 | /* Set Feature */ | |
114 | buf[0] = 0x9; /* Report Number */ | |
115 | buf[1] = 0xff; | |
116 | buf[2] = 0xff; | |
117 | buf[3] = 0xff; | |
118 | res = ioctl(fd, HIDIOCSFEATURE(4), buf); | |
119 | if (res < 0) | |
120 | perror("HIDIOCSFEATURE"); | |
121 | else | |
122 | printf("ioctl HIDIOCGFEATURE returned: %d\n", res); | |
123 | ||
124 | /* Get Feature */ | |
125 | buf[0] = 0x9; /* Report Number */ | |
126 | res = ioctl(fd, HIDIOCGFEATURE(256), buf); | |
127 | if (res < 0) { | |
128 | perror("HIDIOCGFEATURE"); | |
129 | } else { | |
130 | printf("ioctl HIDIOCGFEATURE returned: %d\n", res); | |
131 | printf("Report data (not containing the report number):\n\t"); | |
132 | for (i = 0; i < res; i++) | |
133 | printf("%hhx ", buf[i]); | |
134 | puts("\n"); | |
135 | } | |
136 | ||
137 | /* Send a Report to the Device */ | |
138 | buf[0] = 0x1; /* Report Number */ | |
139 | buf[1] = 0x77; | |
140 | res = write(fd, buf, 2); | |
141 | if (res < 0) { | |
142 | printf("Error: %d\n", errno); | |
143 | perror("write"); | |
144 | } else { | |
145 | printf("write() wrote %d bytes\n", res); | |
146 | } | |
147 | ||
148 | /* Get a report from the device */ | |
149 | res = read(fd, buf, 16); | |
150 | if (res < 0) { | |
151 | perror("read"); | |
152 | } else { | |
153 | printf("read() read %d bytes:\n\t", res); | |
154 | for (i = 0; i < res; i++) | |
155 | printf("%hhx ", buf[i]); | |
156 | puts("\n"); | |
157 | } | |
158 | close(fd); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | const char * | |
163 | bus_str(int bus) | |
164 | { | |
165 | switch (bus) { | |
166 | case BUS_USB: | |
167 | return "USB"; | |
168 | break; | |
169 | case BUS_HIL: | |
170 | return "HIL"; | |
171 | break; | |
172 | case BUS_BLUETOOTH: | |
173 | return "Bluetooth"; | |
174 | break; | |
175 | case BUS_VIRTUAL: | |
176 | return "Virtual"; | |
177 | break; | |
178 | default: | |
179 | return "Other"; | |
180 | break; | |
181 | } | |
182 | } |