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authorPeter Hutterer <peter.hutterer@who-t.net>2018-12-05 10:42:24 +1000
committerBenjamin Tissoires <benjamin.tissoires@redhat.com>2018-12-07 16:27:13 +0100
commit2dc702c991e3774af9d7ce410eef410ca9e2357e (patch)
tree227cb95401e7b53c2f60edd52bee40e0b683f3da /include
parent5a4abb36f312cf83206b1b7d1308ba47cba0b3cc (diff)
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HID: input: use the Resolution Multiplier for high-resolution scrolling
Windows uses a magic number of 120 for a wheel click. High-resolution scroll wheels are supposed to use a fraction of 120 to signal smaller scroll steps. This is implemented by the Resolution Multiplier in the device itself. If the multiplier is present in the report descriptor, set it to the logical max and then use the resolution multiplier to calculate the high-resolution events. This is the recommendation by Microsoft, see http://msdn.microsoft.com/en-us/windows/hardware/gg487477.aspx Note that all mice encountered so far have a logical min/max of 0/1, so it's a binary "yes or no" to high-res scrolling anyway. To make userspace simpler, always enable the REL_WHEEL_HI_RES bit. Where the device doesn't support high-resolution scrolling, the value for the high-res data will simply be a multiple of 120 every time. For userspace, if REL_WHEEL_HI_RES is available that is the one to be used. Potential side-effect: a device with a Resolution Multiplier applying to other Input items will have those items set to the logical max as well. This cannot easily be worked around but it is doubtful such devices exist. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Verified-by: Harry Cutts <hcutts@chromium.org> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/hid.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h
index fd8d860365a4..93db548f8761 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -233,6 +233,7 @@ struct hid_item {
#define HID_DC_BATTERYSTRENGTH 0x00060020
#define HID_CP_CONSUMER_CONTROL 0x000c0001
+#define HID_CP_AC_PAN 0x000c0238
#define HID_DG_DIGITIZER 0x000d0001
#define HID_DG_PEN 0x000d0002
@@ -441,11 +442,13 @@ struct hid_usage {
__s8 resolution_multiplier;/* Effective Resolution Multiplier
(HUT v1.12, 4.3.1), default: 1 */
/* hidinput data */
+ __s8 wheel_factor; /* 120/resolution_multiplier */
__u16 code; /* input driver code */
__u8 type; /* input driver type */
__s8 hat_min; /* hat switch fun */
__s8 hat_max; /* ditto */
__s8 hat_dir; /* ditto */
+ __s16 wheel_accumulated; /* hi-res wheel */
};
struct hid_input;