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Linux/samples/hidraw/hid-example.c

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

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