Hello,
I am looking at writing a driver for the Logitech G13 which reports as a
HID. There is already a version of a driver (not in the kernel) that uses
quirks to get the usbhid driver to ignore the device, but I was hoping to
write a driver that would integrate a bit more smoothly using the hid api.
At the end of this email is a listing that I get from 'lsusb -vv' for the
g13.
The existing driver uses a urb to transfer control messages, and in probe
establishes the urb with:
dev = interface_to_usbdev(iface);
pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
/* create a urb, and a buffer for it */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) return -ENOMEM;
buf = usb_buffer_alloc(dev, KEY_BUFFER_SIZE, GFP_KERNEL, &new_dma);
if (!buf) return -ENOMEM;
usb_fill_int_urb(urb, dev, pipe, buf, KEY_BUFFER_SIZE, g13_irq, 0,
endpoint->bInterval);
urb->transfer_dma = new_dma;
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
Would I need to connect to HIDRAW to establish the same control? Should I
forget about using the hid api and go with the raw usb?
Thanks,
====
Device report:
Bus 005 Device 007: ID 046d:c21c Logitech, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech, Inc.
idProduct 0xc21c
bcdDevice 1.03
iManufacturer 0
iProduct 1 G13
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 61
Report Descriptors:
** UNAVAILABLE **
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 2
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
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