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HID: asus: ignore declared dummy usages 

Keyboards handled by hid-asus declare special key functions
using a vendor-specific page, however, alongside legitimate
key functions, dummy usages with seemingly arbitrary values
are also declared and can lead to keyboards being detected
as pointer devices by some software (such as X.org).

In addition, for the I2C keyboard volume controls are
separately declared in a Consumer Usage page, with the same
dummy usage problem.

The fix in 1989dada7c ("HID: input: ignore System Control
application usages if not System Controls") does not mitigate
the problem described above, therefore dummy usages need to
be ignored in the driver itself.

This fix properly ignores dummy usages and introduces a quirk
for custom handling of the Consumer Usages on the I2C keyboard.

Signed-off-by: Matjaz Hegedic <matjaz.hegedic@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
Matjaz Hegedic 2017-03-09 00:31:14 +01:00 committed by Jiri Kosina
parent a93913e149
commit 0485b1ec28
1 changed files with 21 additions and 2 deletions
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23
drivers/hid/hid-asus.c
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@ -63,9 +63,11 @@ MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad");
#define QUIRK_NO_INIT_REPORTS BIT(1)
#define QUIRK_SKIP_INPUT_MAPPING BIT(2)
#define QUIRK_IS_MULTITOUCH BIT(3)
#define QUIRK_NO_CONSUMER_USAGES BIT(4)
#define I2C_KEYBOARD_QUIRKS (QUIRK_FIX_NOTEBOOK_REPORT | \
QUIRK_NO_INIT_REPORTS)
QUIRK_NO_INIT_REPORTS | \
QUIRK_NO_CONSUMER_USAGES)
#define I2C_TOUCHPAD_QUIRKS (QUIRK_NO_INIT_REPORTS | \
QUIRK_SKIP_INPUT_MAPPING | \
QUIRK_IS_MULTITOUCH)
@ -242,11 +244,28 @@ static int asus_input_mapping(struct hid_device *hdev,
case 0x5c: asus_map_key_clear(KEY_PROG3); break;
default:
return 0;
/* ASUS lazily declares 256 usages, ignore the rest,
* as some make the keyboard appear as a pointer device. */
return -1;
}
return 1;
}
if (drvdata->quirks & QUIRK_NO_CONSUMER_USAGES &&
(usage->hid & HID_USAGE_PAGE) == HID_UP_CONSUMER) {
switch (usage->hid & HID_USAGE) {
case 0xe2: /* Mute */
case 0xe9: /* Volume up */
case 0xea: /* Volume down */
return 0;
default:
/* Ignore dummy Consumer usages which make the
* keyboard incorrectly appear as a pointer device.
*/
return -1;
}
}
return 0;
}