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