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hidraw: store the report usage page and usage

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We might need to check against them too, so parse them and store them.

It is a little bit tricky when there is no report ID. In this case, assume
that the Collection(Application) is a match.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-10-07 20:05:48 -04:00
parent aacdb9923e
commit a207fa0989
2 changed files with 39 additions and 9 deletions
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46
src/libratbag-hidraw.c
View File

@@ -37,6 +37,13 @@
#endif
#define HID_REPORT_ID 0b10000100
#define HID_COLLECTION 0b10100000
#define HID_USAGE_PAGE 0b00000100
#define HID_USAGE 0b00001000
#define HID_PHYSICAL 0
#define HID_APPLICATION 1
#define HID_LOGICAL 2
static int
ratbag_hidraw_parse_report_descriptor(struct ratbag_device *device)
@@ -45,6 +52,7 @@ ratbag_hidraw_parse_report_descriptor(struct ratbag_device *device)
struct ratbag_hidraw *hidraw = &device->hidraw;
struct hidraw_report_descriptor report_desc = {0};
unsigned int i, j;
unsigned int usage_page, usage;
hidraw->num_reports = 0;
@@ -58,10 +66,13 @@ ratbag_hidraw_parse_report_descriptor(struct ratbag_device *device)
return rc;
i = 0;
usage_page = 0;
usage = 0;
while (i < report_desc.size) {
uint8_t value = report_desc.value[i];
uint8_t hid = value & 0xfc;
uint8_t size = value & 0x3;
unsigned content = 0;
if (size == 3)
size = 4;
@@ -69,17 +80,34 @@ ratbag_hidraw_parse_report_descriptor(struct ratbag_device *device)
if (i + size >= report_desc.size)
return -EPROTO;
if (hid == HID_REPORT_ID) {
unsigned report_id = 0;
for (j = 0; j < size; j++)
content |= report_desc.value[i + j + 1] << ((size - j - 1) * 8);
for (j = 0; j < size; j++) {
report_id |= report_desc.value[i + j + 1] << ((size - j - 1) * 8);
if (hidraw->reports) {
log_debug(device->ratbag, "report ID %02x\n", report_id);
hidraw->reports[hidraw->num_reports].report_id = report_id;
}
hidraw->num_reports++;
switch (hid) {
case HID_REPORT_ID:
if (hidraw->reports) {
log_debug(device->ratbag, "report ID %02x\n", content);
hidraw->reports[hidraw->num_reports].report_id = content;
hidraw->reports[hidraw->num_reports].usage_page = usage_page;
hidraw->reports[hidraw->num_reports].usage = usage;
}
hidraw->num_reports++;
break;
case HID_COLLECTION:
if (content == HID_APPLICATION &&
hidraw->reports &&
!hidraw->num_reports &&
!hidraw->reports[0].report_id) {
hidraw->reports[hidraw->num_reports].usage_page = usage_page;
hidraw->reports[hidraw->num_reports].usage = usage;
}
break;
case HID_USAGE_PAGE:
usage_page = content;
break;
case HID_USAGE:
usage = content;
break;
}
i += 1 + size;

2
src/libratbag-hidraw.h
View File

@@ -36,6 +36,8 @@
struct ratbag_hid_report {
unsigned int report_id;
unsigned int usage_page;
unsigned int usage;
};
struct ratbag_hidraw {