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fb58920c9e
We use the unofficial, Windows 8, Relative Scan time HID usage (Digitizer page, 0x56) to add timestamps to our HID touchpad events. The timestamps is a rolling, unsigned, 16-bit integer, with a resolution of 100us (so it wraps around every 6.5s). The host will be able to synchronize to that timestamp, resetting an offset every time the touchpad is quiet a certain amount of time (e.g. 1 second). BRANCH=none BUG=b:63685117 TEST=Flash hammer, timestamps are reported in HID descriptor. Change-Id: Ie5d56a9df14e464d2cdcd559f550d6e3cc81961f Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/603041 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
34 lines
762 B
C
34 lines
762 B
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* USB HID definitions.
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*/
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#ifndef __CROS_EC_USB_HID_KEYBOARD_H
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#define __CROS_EC_USB_HID_KEYBOARD_H
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#define USB_HID_TOUCHPAD_TIMESTAMP_UNIT 100 /* usec */
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struct usb_hid_touchpad_report {
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uint8_t id; /* 0x01 */
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struct {
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unsigned tip:1;
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unsigned inrange:1;
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unsigned id:4;
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unsigned pressure:10;
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unsigned width:12;
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unsigned height:12;
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unsigned x:12;
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unsigned y:12;
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} __packed finger[5];
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uint8_t count:7;
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uint8_t button:1;
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uint16_t timestamp;
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} __packed;
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/* class implementation interfaces */
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void set_touchpad_report(struct usb_hid_touchpad_report *report);
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#endif
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