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USB HID: report descriptor of Cypress USB barcode readers needs fixup

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Certain versions of Cypress USB barcode readers (this problem is known to
happen at least with PIDs 0xde61 and 0xde64) have report descriptor which
has swapped usage min and usage max tag. This results in HID parser failing
for report descriptor of these devices, as it (wrongly) requires allocating
more usages than HID_MAX_USAGES.

Solve this by walking through the report descriptor for such devices, and swap
the usage min and usage max items (and their values) to be in proper order.

Reported-by: Bret Towe <magnade@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina
2007-05-02 11:55:42 +02:00
parent 3b180bff4c
commit 66da876962
3 changed files with 33 additions and 0 deletions
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include/linux/hid.h
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@ -275,6 +275,7 @@ struct hid_item {
#define HID_QUIRK_LOGITECH_DESCRIPTOR 0x00100000
#define HID_QUIRK_DUPLICATE_USAGES 0x00200000
#define HID_QUIRK_RESET_LEDS 0x00400000
#define HID_QUIRK_SWAPPED_MIN_MAX 0x00800000
/*
* This is the global environment of the parser. This information is