On 04/26/2012 05:46 AM, Tom Harwood wrote:
21.12.2011 11:25, Jiri Kosina wrote:
i.e. the device presents 32k of cosumer usages, which is beyond the limit
on the number of usages the current parser in the kernel supports (12288).
Bumping up the HID_MAX_USAGES constant would work around the problem, but
I don't believe the keyboard is actually generating such a wide range of
consumer page usages.
Hi Jiri,
I have the same Trust GXT 18 Gaming keyboard (http://www.trust.com/products/product.aspx?artnr=17468). I spent a week reading through the drivers/hid, drivers/input code, and came up with the following:
The keyboard is pretty standard, with a boot interface and a report interface. The report interface has two problems:
- as you noted, the device presents 2^15 consumer usages, much larger than the HID_MAX_USAGES=12288 limit
- no LED usage block is presented, preventing any use of the num/caps/scroll LEDs in report mode
I tried making a test module (code below) to make the keyboard work. It does the following:
- provides a fixed report descriptor, correcting the 2^15 consumer usages problem
- adds an LED usage block into the report descriptor, then redirects LED change events to the boot interface.
The keyboard works when using the module, typing on it now :) When using it, the dmesg looks like:
[10190.049600] usbhid 2-1.2:1.0: usb_probe_interface
[10190.049607] usbhid 2-1.2:1.0: usb_probe_interface - got id
[10190.059403] input: KB USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/input/input18
[10190.059440] usb 2-1.2: link qh8-0e01/ea8d2d40 start 0 [1/2 us]
[10190.059661] holtek_kbd 0003:04D9:A055.0007: input,hidraw0: USB HID v1.10 Keyboard [KB USB Keyboard] on usb-0000:00:1d.0-1.2/input0
[10190.059720] usb 2-1.2: adding 2-1.2:1.1 (config #1, interface 1)
[10190.059801] usbhid 2-1.2:1.1: usb_probe_interface
[10190.059807] usbhid 2-1.2:1.1: usb_probe_interface - got id
[10190.077504] input: KB USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.1/input/input19
[10190.077542] usb 2-1.2: link qh8-0e01/f42fae00 start 1 [1/2 us]
[10190.077778] holtek_kbd 0003:04D9:A055.0008: input,hidraw1: USB HID v1.10 Keyboard [KB USB Keyboard] on usb-0000:00:1d.0-1.2/input1
Below is my first attempt at writing some kernel code.
Are there any suggestions how to improve/replace the code below, to make a nice patch?
thanks,
Tom
---
drivers/hid/Kconfig | 12 +++-
drivers/hid/Makefile | 3 +-
drivers/hid/hid-core.c | 1 +
drivers/hid/hid-holtek-kbd.c | 172 ++++++++++++++++++++++++++++++++++++++++++
drivers/hid/hid-ids.h | 3 +
5 files changed, 188 insertions(+), 3 deletions(-)
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index a3d0332..4172c90 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -178,10 +178,10 @@ config HID_EZKEY
Support for Ezkey BTC 8193 keyboard.
config HID_HOLTEK
- tristate "Holtek On Line Grip based game controller support"
+ tristate "Holtek devices"
depends on USB_HID
---help---
- Say Y here if you have a Holtek On Line Grip based game controller.
+ Support for Holtek based devices devices.
config HOLTEK_FF
bool "Holtek On Line Grip force feedback support"
@@ -191,6 +191,14 @@ config HOLTEK_FF
Say Y here if you have a Holtek On Line Grip based game controller
and want to have force feedback support for it.
+config HID_HOLTEK_KBD
+ tristate "Holtek based keyboard"
+ depends on HID_HOLTEK
+ ---help---
+ Support for Holtek based keyboards with faulty HID descriptors.
+ Currently supported:
+ - Trust GXT 18 Gaming Keyboard
+
config HID_KEYTOUCH
tristate "Keytouch HID devices"
depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 22f1d16..edb4ae2 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -45,7 +45,8 @@ obj-$(CONFIG_HID_EMS_FF) += hid-emsff.o
obj-$(CONFIG_HID_ELECOM) += hid-elecom.o
obj-$(CONFIG_HID_EZKEY) += hid-ezkey.o
obj-$(CONFIG_HID_GYRATION) += hid-gyration.o
-obj-$(CONFIG_HID_HOLTEK) += hid-holtekff.o
+obj-$(CONFIG_HID_HOLTEK_FF) += hid-holtekff.o
+obj-$(CONFIG_HID_HOLTEK_KBD) += hid-holtek-kbd.o
obj-$(CONFIG_HID_HYPERV_MOUSE) += hid-hyperv.o
obj-$(CONFIG_HID_KENSINGTON) += hid-kensington.o
obj-$(CONFIG_HID_KEYTOUCH) += hid-keytouch.o
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 990fe19..0d949c9 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1435,6 +1435,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_3) },
{ HID_USB_DEVICE(USB_VENDOR_ID_HANVON, USB_DEVICE_ID_HANVON_MULTITOUCH) },
{ HID_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT, USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT, USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) },
{ HID_USB_DEVICE(USB_VENDOR_ID_IDEACOM, USB_DEVICE_ID_IDEACOM_IDC6650) },
{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK, USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP) },
{ HID_USB_DEVICE(USB_VENDOR_ID_ILITEK, USB_DEVICE_ID_ILITEK_MULTITOUCH) },
diff --git a/drivers/hid/hid-holtek-kbd.c b/drivers/hid/hid-holtek-kbd.c
new file mode 100644
index 0000000..8aa8c8d
--- /dev/null
+++ b/drivers/hid/hid-holtek-kbd.c
@@ -0,0 +1,172 @@
+/*
+ * HID driver for Holtek keyboard
+ * XXX name
+*/
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include<linux/device.h>
+#include<linux/hid.h>
+#include<linux/module.h>
+#include<linux/usb.h>
+
+#include "hid-ids.h"
+#include "usbhid/usbhid.h"
+
+static __u8 holtek_kbd_rdesc_fixed[] = {
+ /* Original report descriptor, with reduced number of consumer usages */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x80, /* Usage (Sys Control), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x01, /* Report ID (1), */
+ 0x19, 0x81, /* Usage Minimum (Sys Power Down), */
+ 0x29, 0x83, /* Usage Maximum (Sys Wake Up), */
+ 0x15, 0x00, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x75, 0x05, /* Report Size (5), */
+ 0x81, 0x01, /* Input (Constant), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0C, /* Usage Page (Consumer), */
+ 0x09, 0x01, /* Usage (Consumer Control), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x02, /* Report ID (2), */
+ 0x19, 0x00, /* Usage Minimum (00h), */
+ 0x2A, 0xFF, 0x2F, /* Usage Maximum (0x2FFF), previously 0x7FFF */
+ 0x15, 0x00, /* Logical Minimum (0), */
+ 0x26, 0xFF, 0x2F, /* Logical Maximum (0x2FFF),previously 0x7FFF*/
+ 0x95, 0x01, /* Report Count (1), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x81, 0x00, /* Input, */
+ 0xC0, /* End Collection, */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x06, /* Usage (Keyboard), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x03, /* Report ID (3), */
+ 0x95, 0x38, /* Report Count (56), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x15, 0x00, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x05, 0x07, /* Usage Page (Keyboard), */
+ 0x19, 0xE0, /* Usage Minimum (KB Leftcontrol), */
+ 0x29, 0xE7, /* Usage Maximum (KB Right GUI), */
+ 0x19, 0x00, /* Usage Minimum (None), */
+ 0x29, 0x2F, /* Usage Maximum (KB Lboxbracket And Lbrace),*/
+ 0x81, 0x02, /* Input (Variable), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x06, /* Usage (Keyboard), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x04, /* Report ID (4), */
+ 0x95, 0x38, /* Report Count (56), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x15, 0x00, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x05, 0x07, /* Usage Page (Keyboard), */
+ 0x19, 0x30, /* Usage Minimum (KB Rboxbracket And Rbrace),*/
+ 0x29, 0x67, /* Usage Maximum (KP Equals), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xC0, /* End Collection */
+
+ /* LED usage for the boot protocol interface */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x06, /* Usage (Keyboard), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x05, 0x08, /* Usage Page (LED), */
+ 0x19, 0x01, /* Usage Minimum (01h), */
+ 0x29, 0x03, /* Usage Maximum (03h), */
+ 0x15, 0x00, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x91, 0x02, /* Output (Variable), */
+ 0x95, 0x05, /* Report Count (5), */
+ 0x91, 0x01, /* Output (Constant), */
+ 0xC0, /* End Collection */
+};
+
+static __u8 *holtek_kbd_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+
+ if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
+ rdesc = holtek_kbd_rdesc_fixed;
+ *rsize = sizeof(holtek_kbd_rdesc_fixed);
+ }
+ return rdesc;
+}
+
+static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type,
+ unsigned int code,
+ int value)
+{
+ struct hid_device *hid = input_get_drvdata(dev);
+ struct usb_device *usb_dev = hid_to_usb_dev(hid);
+
+ /* Locate the boot interface, to receive the LED change events */
+ struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0);
+
+ /* XXX check here we actually get a struct hid_device*? */
+ struct hid_device *boot_hid = usb_get_intfdata(boot_interface);
+ struct hid_input *boot_hid_input = list_first_entry(&boot_hid->inputs,
+ struct hid_input, list);
+
+ return boot_hid_input->input->event(boot_hid_input->input, type, code,
+ value);
+}
+
+static int holtek_kbd_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
+ struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+ int ret = hid_parse(hdev);
+
+ if (!ret)
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+
+ if (!ret&& intf->cur_altsetting->desc.bInterfaceNumber == 1) {
+ struct hid_input *hidinput;
+ list_for_each_entry(hidinput,&hdev->inputs, list) {
+ hidinput->input->event = holtek_kbd_input_event;
+ }
+ }
+
+ return ret;
+}
+
+static const struct hid_device_id holtek_kbd_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
+ USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) },
+ { }
+};
+MODULE_DEVICE_TABLE(hid, holtek_kbd_devices);
+
+static struct hid_driver holtek_kbd_driver = {
+ .name = "holtek_kbd",
+ .id_table = holtek_kbd_devices,
+ .report_fixup = holtek_kbd_report_fixup,
+ .probe = holtek_kbd_probe
+};
+
+static int __init holtek_kbd_init(void)
+{
+ return hid_register_driver(&holtek_kbd_driver);
+}
+
+static void __exit holtek_kbd_exit(void)
+{
+ hid_unregister_driver(&holtek_kbd_driver);
+}
+
+module_exit(holtek_kbd_exit);
+module_init(holtek_kbd_init);
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 3eb0090..6a88041 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -398,6 +398,9 @@
#define USB_VENDOR_ID_HOLTEK 0x1241
#define USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP 0x5015
+#define USB_VENDOR_ID_HOLTEK_ALT 0x04d9
+#define USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD 0xa055
+
#define USB_VENDOR_ID_IMATION 0x0718
#define USB_DEVICE_ID_DISC_STAKKA 0xd000
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Hi Tom,
I got a keyboard which using the same chip holtek as you. I have applied
your patch and it works. However, I have dump the keyboard descriptor
(rdesc) as below, I am wondering to understand the keyboard descriptor
like (usage page, maximum, minimum ... etc) can you point out to where
to read ? I would like to apply and check with what I got from my
keyboard rdesc.
--- here my keyboard descriptor ---
Bus 005 Device 002: ID 04d9:a055 Holtek Semiconductor, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04d9 Holtek Semiconductor, Inc.
idProduct 0xa055
bcdDevice 0.20
iManufacturer 1 KB
iProduct 2 USB Keyboard
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 59
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 1 Keyboard
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 75
Report Descriptor: (length is 75)
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x06 ] 6
Keyboard
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0xe0 ] 224
Control Left
Item(Local ): Usage Maximum, data= [ 0xe7 ] 231
GUI Right
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x08 ] 8
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Main ): Input, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x03 ] 3
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Usage Page, data= [ 0x08 ] 8
LEDs
Item(Local ): Usage Minimum, data= [ 0x01 ] 1
NumLock
Item(Local ): Usage Maximum, data= [ 0x03 ] 3
Scroll Lock
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x05 ] 5
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Main ): Output, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x06 ] 6
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0x00 ] 0
No Event
Item(Local ): Usage Maximum, data= [ 0x91 ] 145
LANG 2 (Hanja Conversion, Korea)
Item(Main ): Input, data= [ 0x00 ] 0
Data Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x00 ] 0
No Event
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x08 ] 8
Item(Main ): Feature, data= [ 0x00 ] 0
Data Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 108
Report Descriptor: (length is 108)
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x80 ] 128
System Control
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x01 ] 1
Item(Local ): Usage Minimum, data= [ 0x81 ] 129
System Power Down
Item(Local ): Usage Maximum, data= [ 0x83 ] 131
System Wake Up
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x03 ] 3
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x05 ] 5
Item(Main ): Input, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Global): Usage Page, data= [ 0x0c ] 12
Consumer
Item(Local ): Usage, data= [ 0x01 ] 1
Consumer Control
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x02 ] 2
Item(Local ): Usage Minimum, data= [ 0x00 ] 0
Unassigned
Item(Local ): Usage Maximum, data= [ 0xff 0x7f ] 32767
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0xff 0x7f ] 32767
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x10 ] 16
Item(Main ): Input, data= [ 0x00 ] 0
Data Array Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x06 ] 6
Keyboard
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x03 ] 3
Item(Global): Report Count, data= [ 0x38 ] 56
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0xe0 ] 224
Control Left
Item(Local ): Usage Maximum, data= [ 0xe7 ] 231
GUI Right
Item(Local ): Usage Minimum, data= [ 0x00 ] 0
No Event
Item(Local ): Usage Maximum, data= [ 0x2f ] 47
[ and { (Bracket and Braces Left)
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x06 ] 6
Keyboard
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x04 ] 4
Item(Global): Report Count, data= [ 0x38 ] 56
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Usage Page, data= [ 0x07 ] 7
Keyboard
Item(Local ): Usage Minimum, data= [ 0x30 ] 48
] and } (Bracket and Braces Right)
Item(Local ): Usage Maximum, data= [ 0x67 ] 103
Keypad = (Equal Sign)
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Device Status: 0x0000
(Bus Powered)
--- End ---
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