Hiya,
I'm trying to write a user-space tool for a simple HID device. All this
device wants is to either receive or send 8 bytes in 'Report 0'.
Is there a way to do this via the hiddev interface? Ideally, I'd like
to skip all the field and usage parsing, and just be able to say "here
is the 8 bytes for the report, send it" or "give me the 8 bytes received
in the report".
Alternatively, if someone could point me in the right direction for
achieving this via getting/setting usages, I'd be content. However,
I get the feeling that the configuration information emitted by this
device might conflict with how the data actually needs to be parsed.
Appended to the end of this message is the debugging output produced
by the hiddev module (via dmesg), as well as a dump of what user-space
sees (via a little device-walking program I wrote). I'm concerned by
the "logical minimum = -128" line --- that seems to make the hid-core
want to do arithmetic conversions. I really just want to send my bytes.
Thanks for any suggestions,
-matt m.
---------------------------
Here is what hiddev says about the device in the kernel (2.4.22):
hub.c: new USB device 00:09.0-2, assigned address 4
hid-core.c: HID probe called for ifnum 0
hid-core.c: reading report type 1 id 0 failed len 8 read -32
Application(ffa0.0001)
INPUT[INPUT]
Field(0)
Physical(ffa0.0002)
Usage(2)
ffa1.0003
ffa1.0004
Logical Minimum(-128)
Logical Maximum(127)
Physical Minimum(0)
Physical Maximum(255)
Report Size(8)
Report Count(8)
Report Offset(0)
Flags( Variable Absolute )
OUTPUT[OUTPUT]
Field(0)
Physical(ffa0.0002)
Usage(2)
ffa1.0005
ffa1.0006
Logical Minimum(-128)
Logical Maximum(127)
Physical Minimum(0)
Physical Maximum(255)
Report Size(8)
Report Count(8)
Report Offset(0)
Flags( Variable Absolute )
---------------------------
And, here is what user-space is allowed to see about the device:
hiddev driver version is 1.0.4
vendor 0x0cc2 product 0xd700 version 0x0308
has 1 application
and is on bus: 2 devnum: 3 ifnum: 0
Application 0 is 0xffa00001 (Unknown page - needs to be added)
Report Info:
Report Type INPUT (0x1), ID 0x0: fields = 1
Field 0:
field index 7
max usage 2
flags 0x2
physical usage 0xffa00002
logical usage 0x0
applicat usage 0xffa00001
log min -128
log max 127
phy min 0
phy max 255
unit exp 0
unit 0
Usage 0: code 0xffa10003
Usage 1: code 0xffa10004
Report Type OUTPUT (0x2), ID 0x0: fields = 1
Field 0:
field index 7
max usage 2
flags 0x2
physical usage 0xffa00002
logical usage 0x0
applicat usage 0xffa00001
log min -128
log max 127
phy min 0
phy max 255
unit exp 0
unit 0
Usage 0: code 0xffa10005
Usage 1: code 0xffa10006
-------------------------------------------------------
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