Hans Verkuil <hverkuil@xxxxxxxxx> wrote: >Hi! > >I've made a video4linux driver for the USB Keene FM Transmitter. See: > >http://www.amazon.co.uk/Keene-Electronics-USB-FM-Transmitter/dp/B003GCHPDY/ref=sr_1_1?ie=UTF8&qid=1326450476&sr=8-1 > >The driver code is here: > >http://git.linuxtv.org/hverkuil/media_tree.git/shortlog/refs/heads/keene > >Unfortunately this device has exactly the same USB ID as the Logitech >AudioHub >USB speaker (http://www.logitech.com/en-us/439/3503). > >The AudioHub has HID support for volume keys, but the FM transmitter >needs >a custom V4L2 driver instead. > >I've attached the full lsusb -v output of both devices, but this is the >diff of >the two: > >$ diff keene.txt audiohub.txt -u >--- keene.txt 2012-01-13 11:10:48.265399953 +0100 >+++ audiohub.txt 2012-01-13 11:09:45.185398935 +0100 >@@ -1,5 +1,5 @@ > >-Bus 007 Device 009: ID 046d:0a0e Logitech, Inc. >+Bus 003 Device 004: ID 046d:0a0e Logitech, Inc. > Device Descriptor: > bLength 18 > bDescriptorType 1 >@@ -12,7 +12,7 @@ > idProduct 0x0a0e > bcdDevice 1.00 > iManufacturer 1 HOLTEK >- iProduct 2 B-LINK USB Audio >+ iProduct 2 AudioHub Speaker > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: >@@ -22,9 +22,8 @@ > bNumInterfaces 3 > bConfigurationValue 1 > iConfiguration 0 >- bmAttributes 0xa0 >+ bmAttributes 0x80 > (Bus Powered) >- Remote Wakeup > MaxPower 500mA > Interface Descriptor: > bLength 9 >@@ -152,7 +151,7 @@ > bCountryCode 0 Not supported > bNumDescriptors 1 > bDescriptorType 34 Report >- wDescriptorLength 22 >+ wDescriptorLength 31 > Report Descriptors: > ** UNAVAILABLE ** > Endpoint Descriptor: > >As you can see, the differences are very small. > >In my git tree I worked around it by adding the USB ID to the ignore >list >if the Keene driver is enabled, and ensuring that the Keene driver is >disabled by default. > >But is there a better method to do this? At least the iProduct strings >are >different, is that something that can be tested in hid-core.c? > >Regards, > > Hans Maybe it doesn't matter, but what do the Report Descriptors look like? http://www.slashdev.ca/2010/05/08/get-usb-report-descriptor-with-linux/ Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
