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Linux/samples/hidraw/hid-example.c

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  1 // SPDX-License-Identifier: GPL-2.0
  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 
 18 /*
 19  * Ugly hack to work around failing compilation on systems that don't
 20  * yet populate new version of hidraw.h to userspace.
 21  */
 22 #ifndef HIDIOCSFEATURE
 23 #warning Please have your distro update the userspace kernel headers
 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 
 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         char *device = "/dev/hidraw0";
 51 
 52         if (argc > 1)
 53                 device = argv[1];
 54 
 55         /* Open the Device with non-blocking reads. In real life,
 56            don't use a hard coded path; use libudev instead. */
 57         fd = open(device, O_RDWR|O_NONBLOCK);
 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 HIDIOCSFEATURE 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 }
183 

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