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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/hidraw.h>
/* ------------------------------------------------------------------ */
static const char *tag_map[4][16] = {
{
/* main */
[ 8 ] = "input",
[ 9 ] = "output",
[ 11 ] = "feature",
[ 10 ] = "collection",
[ 12 ] = "end",
},{
/* global */
[ 0 ] = "usage page",
[ 1 ] = "logical min",
[ 2 ] = "logical max",
[ 3 ] = "physical min",
[ 4 ] = "physical max",
[ 5 ] = "unit exponent",
[ 6 ] = "unit",
[ 7 ] = "report size",
[ 8 ] = "report id",
[ 9 ] = "report count",
[ 10 ] = "push",
[ 11 ] = "pop",
},{
/* local */
[ 0 ] = "usage",
[ 1 ] = "usage min",
[ 2 ] = "usage max",
[ 3 ] = "desig index",
[ 4 ] = "desig min",
[ 5 ] = "desig max",
[ 7 ] = "string index",
[ 8 ] = "string min",
[ 9 ] = "string max",
[ 10 ] = "delimiter",
},{
/* reserved */
}
};
static const char *type_map[4] = {
"main", "global", "local", "reserved"
};
static const int size_map[4] = {
0, 1, 2, 4
};
static void print_report(unsigned char *desc, int descsize)
{
unsigned data;
int tag, type, size, bytes;
int i, off = 0;
while (off < descsize) {
if (desc[off] == 0xfe) {
printf("TODO: long item\n");
return;
} else {
tag = (desc[off] >> 4) & 0x0f;
type = (desc[off] >> 2) & 0x03;
size = (desc[off] >> 0) & 0x03;
printf(" %-16s %-6s %d --",
tag_map[type][tag] ?: "?",
type_map[type],
size_map[size]);
data = 0;
for (i = 0; i < size_map[size]; i++)
data |= desc[off + 1 + i] << (8 * i);
printf(" %8x -- ", data);
bytes = size_map[size] + 1;
for (i = 0; i < bytes && off + i < descsize; i++)
printf(" %02x", desc[off+i]);
printf("\n");
off += bytes;
}
}
}
static int usage(char *prog, int error)
{
fprintf(error ? stderr : stdout,
"usage: %s"
" [ -h ]\n",
prog);
exit(error);
}
int main(int argc, char *argv[])
{
struct hidraw_report_descriptor desc;
int i, c, fd, rc, size;
char devname[32];
for (;;) {
if (-1 == (c = getopt(argc, argv, "hv")))
break;
switch (c) {
case 'h':
usage(argv[0], 0);
default:
usage(argv[0], 1);
}
}
for (i = 0; i < HIDRAW_MAX_DEVICES; i++) {
snprintf(devname, sizeof(devname), "/dev/hidraw%d", i);
fd = open(devname, O_RDWR);
if (fd < 0) {
if (errno != ENOENT) {
fprintf(stderr, "%s: %s\n", devname, strerror(errno));
continue;
} else {
break;
}
}
rc = ioctl(fd, HIDIOCGRDESCSIZE, &size);
desc.size = size;
rc = ioctl(fd, HIDIOCGRDESC, &desc);
if (rc < 0) {
fprintf(stderr, "%s: HIDIOCGRDESC: %s\n", devname, strerror(errno));
continue;
}
close(fd);
printf("%s (%d)\n", devname, size);
print_report(desc.value, size);
}
return 0;
}
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