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    Subject[PATCH 3.12 181/212] HID:hid-lg4ff: Scale autocentering force properly on Logitech wheel
    Date
    3.12-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Simon Wood <simon@mungewell.org>

    commit f8c231569a7a455dfa1907294a46ba52b3aa8859 upstream.

    Adjust the scaling and lineartity to match that of the Windows
    driver (from MOMO testing).

    Reported-by: Elias Vanderstuyft <elias.vds@gmail.com>
    Signed-off-by: Simon Wood <simon@mungewell.org>
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/hid/hid-lg4ff.c | 15 ++++++++++++---
    1 file changed, 12 insertions(+), 3 deletions(-)

    --- a/drivers/hid/hid-lg4ff.c
    +++ b/drivers/hid/hid-lg4ff.c
    @@ -218,12 +218,21 @@ static void hid_lg4ff_set_autocenter_def
    struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
    struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
    __s32 *value = report->field[0]->value;
    + __u32 expand_a, expand_b;
    +
    + if (magnitude <= 0xaaaa) {
    + expand_a = 0x0c * magnitude;
    + expand_b = 0x80 * magnitude;
    + } else {
    + expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
    + expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
    + }

    value[0] = 0xfe;
    value[1] = 0x0d;
    - value[2] = magnitude >> 13;
    - value[3] = magnitude >> 13;
    - value[4] = magnitude >> 8;
    + value[2] = expand_a / 0xaaaa;
    + value[3] = expand_a / 0xaaaa;
    + value[4] = expand_b / 0xaaaa;
    value[5] = 0x00;
    value[6] = 0x00;




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