lkml.org 
[lkml]   [2019]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH AUTOSEL 4.9 21/33] HID: input: fix a4tech horizontal wheel custom usage
    Date
    From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

    [ Upstream commit 1c703b53e5bfb5c2205c30f0fb157ce271fd42fb ]

    Some a4tech mice use the 'GenericDesktop.00b8' usage to inform whether
    the previous wheel report was horizontal or vertical. Before
    c01908a14bf73 ("HID: input: add mapping for "Toggle Display" key") this
    usage was being mapped to 'Relative.Misc'. After the patch it's simply
    ignored (usage->type == 0 & usage->code == 0). Which ultimately makes
    hid-a4tech ignore the WHEEL/HWHEEL selection event, as it has no
    usage->type.

    We shouldn't rely on a mapping for that usage as it's nonstandard and
    doesn't really map to an input event. So we bypass the mapping and make
    sure the custom event handling properly handles both reports.

    Fixes: c01908a14bf73 ("HID: input: add mapping for "Toggle Display" key")
    Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/hid/hid-a4tech.c | 30 +++++++++++++++++++++++++++---
    1 file changed, 27 insertions(+), 3 deletions(-)

    diff --git a/drivers/hid/hid-a4tech.c b/drivers/hid/hid-a4tech.c
    index 9428ea7cdf8a0..c52bd163abb3e 100644
    --- a/drivers/hid/hid-a4tech.c
    +++ b/drivers/hid/hid-a4tech.c
    @@ -26,12 +26,36 @@
    #define A4_2WHEEL_MOUSE_HACK_7 0x01
    #define A4_2WHEEL_MOUSE_HACK_B8 0x02

    +#define A4_WHEEL_ORIENTATION (HID_UP_GENDESK | 0x000000b8)
    +
    struct a4tech_sc {
    unsigned long quirks;
    unsigned int hw_wheel;
    __s32 delayed_value;
    };

    +static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
    + struct hid_field *field, struct hid_usage *usage,
    + unsigned long **bit, int *max)
    +{
    + struct a4tech_sc *a4 = hid_get_drvdata(hdev);
    +
    + if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
    + usage->hid == A4_WHEEL_ORIENTATION) {
    + /*
    + * We do not want to have this usage mapped to anything as it's
    + * nonstandard and doesn't really behave like an HID report.
    + * It's only selecting the orientation (vertical/horizontal) of
    + * the previous mouse wheel report. The input_events will be
    + * generated once both reports are recorded in a4_event().
    + */
    + return -1;
    + }
    +
    + return 0;
    +
    +}
    +
    static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
    struct hid_field *field, struct hid_usage *usage,
    unsigned long **bit, int *max)
    @@ -53,8 +77,7 @@ static int a4_event(struct hid_device *hdev, struct hid_field *field,
    struct a4tech_sc *a4 = hid_get_drvdata(hdev);
    struct input_dev *input;

    - if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
    - !usage->type)
    + if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
    return 0;

    input = field->hidinput->input;
    @@ -65,7 +88,7 @@ static int a4_event(struct hid_device *hdev, struct hid_field *field,
    return 1;
    }

    - if (usage->hid == 0x000100b8) {
    + if (usage->hid == A4_WHEEL_ORIENTATION) {
    input_event(input, EV_REL, value ? REL_HWHEEL :
    REL_WHEEL, a4->delayed_value);
    return 1;
    @@ -129,6 +152,7 @@ MODULE_DEVICE_TABLE(hid, a4_devices);
    static struct hid_driver a4_driver = {
    .name = "a4tech",
    .id_table = a4_devices,
    + .input_mapping = a4_input_mapping,
    .input_mapped = a4_input_mapped,
    .event = a4_event,
    .probe = a4_probe,
    --
    2.20.1
    \
     
     \ /
      Last update: 2019-08-14 04:56    [W:4.586 / U:1.084 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site