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Input: cros_ec_keyb - fix button/switch capability reports

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The cros_ec_keyb_bs array lists buttons and switches together, expecting
that its users will match the appropriate type and bit fields. But
cros_ec_keyb_register_bs() only checks the 'bit' field, which causes
misreported input capabilities in some cases. For example, tablets
(e.g., Scarlet -- a.k.a. Acer Chromebook Tab 10) were reporting a SW_LID
capability, because EC_MKBP_POWER_BUTTON and EC_MKBP_LID_OPEN happen to
share the same bit.

(This has comedic effect on a tablet, in which a power-management daemon
then thinks this "lid" is closed, and so puts the system to sleep as
soon as it boots!)

To fix this, check both the 'ev_type' and 'bit' fields before reporting
the capability.

Tested with a lid (Kevin / Samsung Chromebook Plus) and without a lid
(Scarlet / Acer Chromebook Tab 10).

This error got introduced when porting the feature from the downstream
Chromium OS kernel to be upstreamed.

Fixes: cdd7950e7aa4 ("input: cros_ec_keyb: Add non-matrix buttons and switches")
Cc: <stable@vger.kernel.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Brian Norris 2018-11-12 11:23:39 -08:00 committed by Dmitry Torokhov
parent 3ed64da3b7
commit ac5722c164
1 changed files with 2 additions and 1 deletions
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3
drivers/input/keyboard/cros_ec_keyb.c
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@ -493,7 +493,8 @@ static int cros_ec_keyb_register_bs(struct cros_ec_keyb *ckdev)
for (i = 0; i < ARRAY_SIZE(cros_ec_keyb_bs); i++) {
const struct cros_ec_bs_map *map = &cros_ec_keyb_bs[i];
if (buttons & BIT(map->bit))
if ((map->ev_type == EV_KEY && (buttons & BIT(map->bit))) ||
(map->ev_type == EV_SW && (switches & BIT(map->bit))))
input_set_capability(idev, map->ev_type, map->code);
}