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hidraw: implement a first dummy parsing of the report descriptor

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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-09-12 09:48:01 -04:00
parent 24cb59af2f
commit d065bda3a6
1 changed files with 60 additions and 0 deletions
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60
src/libratbag-hidraw.c
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@@ -36,6 +36,55 @@
#define HID_MAX_BUFFER_SIZE 4096 /* 4kb */
#endif
#define HID_REPORT_ID 0b10000100
static int
ratbag_hidraw_parse_report_descriptor(struct ratbag_device *device)
{
int rc, desc_size = 0;
struct hidraw_report_descriptor report_desc = {0};
unsigned int i, j;
rc = ioctl(device->hidraw.fd, HIDIOCGRDESCSIZE, &desc_size);
if (rc < 0)
return rc;
report_desc.size = desc_size;
rc = ioctl(device->hidraw.fd, HIDIOCGRDESC, &report_desc);
if (rc < 0)
return rc;
log_buf_error(device->ratbag,
"Report Descriptor:\n",
report_desc.value, report_desc.size);
i = 0;
while (i < report_desc.size) {
uint8_t value = report_desc.value[i];
uint8_t hid = value & 0xfc;
uint8_t size = value & 0x3;
if (size == 3)
size = 4;
if (i + size >= report_desc.size)
return -EPROTO;
if (hid == HID_REPORT_ID)
log_error(device->ratbag, "main item: %02x\n", hid);
for (j = 0; j < size; j++) {
value = report_desc.value[i + j + 1];
if (hid == HID_REPORT_ID)
log_error(device->ratbag, " %02x\n", value);
}
i += 1 + j;
}
return 0;
}
int
ratbag_open_hidraw(struct ratbag_device *device)
{
@@ -61,6 +110,17 @@ ratbag_open_hidraw(struct ratbag_device *device)
device->hidraw.fd = fd;
res = ratbag_hidraw_parse_report_descriptor(device);
if (res) {
log_error(device->ratbag,
"Error while parsing the report descriptor: '%s' (%d)\n",
strerror(-res),
res);
device->hidraw.fd = -1;
goto err;
}
return 0;
err: