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| author | Simon Wood <simon@mungewell.org> | 2013-11-06 12:30:40 -0700 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2013-11-08 14:12:07 +0100 |
| commit | f8c231569a7a455dfa1907294a46ba52b3aa8859 (patch) | |
| tree | 98be70be052db82865ee7f809f4649bb20085e54 | |
| parent | 362ecc7c38ac3806d2afca92b25094e6063a0f17 (diff) | |
| download | lwn-f8c231569a7a455dfa1907294a46ba52b3aa8859.tar.gz lwn-f8c231569a7a455dfa1907294a46ba52b3aa8859.zip | |
HID:hid-lg4ff: Scale autocentering force properly on Logitech wheel
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>
| -rw-r--r-- | drivers/hid/hid-lg4ff.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c index 8782fe1aaa07..530fcd19e90e 100644 --- a/drivers/hid/hid-lg4ff.c +++ b/drivers/hid/hid-lg4ff.c @@ -218,12 +218,21 @@ static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitud 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; |