hi all:
I have some questions about input/hid devices.
1. it seems only usb hid has reports_desc, why don't we put hid parse
in usbhid/hid-core.c instead of hid/hid-core.c?
2. at the end of mail is the report from mouse hid.
i. where is the "USAGE_PAGE (Button) " defined, I cannot find
Button id in usage table.
ii. REPORT_SIZE (1) always mean the unit is bit?
3. Spec seems only describe the value of the item mean, where I can
find the rules of the layout of the descriptor?
char ReportDescriptor[50] = {
02 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
03 0x09, 0x02, // USAGE (Mouse)
04 0xa1, 0x01, // COLLECTION (Application)
05 0x09, 0x01, // USAGE (Pointer)
06 0xa1, 0x00, // COLLECTION (Physical)
07 0x05, 0x09, // USAGE_PAGE (Button)
08 0x19, 0x01, // USAGE_MINIMUM (Button 1)
09 0x29, 0x03, // USAGE_MAXIMUM (Button 3)
10 0x15, 0x00, // LOGICAL_MINIMUM (0)
11 0x25, 0x01, // LOGICAL_MAXIMUM (1)
12 0x95, 0x03, // REPORT_COUNT (3)
13 0x75, 0x01, // REPORT_SIZE (1)
14 0x81, 0x02, // INPUT (Data,Var,Abs)
15 0x95, 0x01, // REPORT_COUNT (1)
16 0x75, 0x05, // REPORT_SIZE (5)
17 0x81, 0x03, // INPUT (Cnst,Var,Abs)
18 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
19 0x09, 0x30, // USAGE (X)
20 0x09, 0x31, // USAGE (Y)
21 0x15, 0x81, // LOGICAL_MINIMUM (-127)
22 0x25, 0x7f, // LOGICAL_MAXIMUM (127)
23 0x75, 0x08, // REPORT_SIZE (8)
24 0x95, 0x02, // REPORT_COUNT (2)
25 0x81, 0x06, // INPUT (Data,Var,Rel)
26 0xc0, // END_COLLECTION
27 0xc0 // END_COLLECTION
28 };
Thanks for your help in advance,
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