I think it should be independent of USB and should be part of hid-core.c. There is a possibility that HID over I2C, proprietary specs used by Win8 can be a standard in future. Thanks, Srinivas -----Original Message----- From: linux-input-owner@xxxxxxxxxxxxxxx [mailto:linux-input-owner@xxxxxxxxxxxxxxx] On Behalf Of loody Sent: Thursday, May 24, 2012 6:39 AM To: linux-input@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx Subject: about input/hid 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, -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
