![Yufeng Shen](/assets/img/avatar_default.png)
The driver for Apple Magic Trackpad/Mouse currently uses Multi-touch Protocol A (MT-A) to report touch events and uses ABS_MT_TRACKING_ID to do finger tracking. The fact of the device being able to track individual finger makes it possible to report touch events using MT-B. This patch converts the driver to use MT-B as it is preferred to MT-A. V4: Removed BTN_TOUCH evnet. V3: Removed the single touch related logic. V2: Converting entirely to MT-B as Henrik Rydberg suggested. Signed-off-by: Yufeng Shen <miletus@chromium.org> Reviewed-and-tested-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
592 lines
17 KiB
C
592 lines
17 KiB
C
/*
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* Apple "Magic" Wireless Mouse driver
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*
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* Copyright (c) 2010 Michael Poole <mdpoole@troilus.org>
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* Copyright (c) 2010 Chase Douglas <chase.douglas@canonical.com>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/input/mt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include "hid-ids.h"
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static bool emulate_3button = true;
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module_param(emulate_3button, bool, 0644);
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MODULE_PARM_DESC(emulate_3button, "Emulate a middle button");
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static int middle_button_start = -350;
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static int middle_button_stop = +350;
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static bool emulate_scroll_wheel = true;
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module_param(emulate_scroll_wheel, bool, 0644);
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MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
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static unsigned int scroll_speed = 32;
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static int param_set_scroll_speed(const char *val, struct kernel_param *kp) {
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unsigned long speed;
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if (!val || strict_strtoul(val, 0, &speed) || speed > 63)
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return -EINVAL;
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scroll_speed = speed;
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return 0;
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}
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module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
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MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
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static bool scroll_acceleration = false;
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module_param(scroll_acceleration, bool, 0644);
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MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
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static bool report_undeciphered;
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module_param(report_undeciphered, bool, 0644);
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MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
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#define TRACKPAD_REPORT_ID 0x28
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#define MOUSE_REPORT_ID 0x29
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#define DOUBLE_REPORT_ID 0xf7
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/* These definitions are not precise, but they're close enough. (Bits
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* 0x03 seem to indicate the aspect ratio of the touch, bits 0x70 seem
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* to be some kind of bit mask -- 0x20 may be a near-field reading,
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* and 0x40 is actual contact, and 0x10 may be a start/stop or change
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* indication.)
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*/
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#define TOUCH_STATE_MASK 0xf0
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#define TOUCH_STATE_NONE 0x00
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#define TOUCH_STATE_START 0x30
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#define TOUCH_STATE_DRAG 0x40
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#define SCROLL_ACCEL_DEFAULT 7
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/* Touch surface information. Dimension is in hundredths of a mm, min and max
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* are in units. */
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#define MOUSE_DIMENSION_X (float)9056
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#define MOUSE_MIN_X -1100
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#define MOUSE_MAX_X 1258
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#define MOUSE_RES_X ((MOUSE_MAX_X - MOUSE_MIN_X) / (MOUSE_DIMENSION_X / 100))
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#define MOUSE_DIMENSION_Y (float)5152
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#define MOUSE_MIN_Y -1589
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#define MOUSE_MAX_Y 2047
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#define MOUSE_RES_Y ((MOUSE_MAX_Y - MOUSE_MIN_Y) / (MOUSE_DIMENSION_Y / 100))
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#define TRACKPAD_DIMENSION_X (float)13000
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#define TRACKPAD_MIN_X -2909
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#define TRACKPAD_MAX_X 3167
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#define TRACKPAD_RES_X \
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((TRACKPAD_MAX_X - TRACKPAD_MIN_X) / (TRACKPAD_DIMENSION_X / 100))
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#define TRACKPAD_DIMENSION_Y (float)11000
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#define TRACKPAD_MIN_Y -2456
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#define TRACKPAD_MAX_Y 2565
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#define TRACKPAD_RES_Y \
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((TRACKPAD_MAX_Y - TRACKPAD_MIN_Y) / (TRACKPAD_DIMENSION_Y / 100))
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/**
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* struct magicmouse_sc - Tracks Magic Mouse-specific data.
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* @input: Input device through which we report events.
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* @quirks: Currently unused.
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* @ntouches: Number of touches in most recent touch report.
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* @scroll_accel: Number of consecutive scroll motions.
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* @scroll_jiffies: Time of last scroll motion.
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* @touches: Most recent data for a touch, indexed by tracking ID.
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* @tracking_ids: Mapping of current touch input data to @touches.
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*/
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struct magicmouse_sc {
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struct input_dev *input;
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unsigned long quirks;
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int ntouches;
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int scroll_accel;
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unsigned long scroll_jiffies;
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struct {
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short x;
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short y;
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short scroll_x;
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short scroll_y;
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u8 size;
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} touches[16];
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int tracking_ids[16];
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};
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static int magicmouse_firm_touch(struct magicmouse_sc *msc)
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{
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int touch = -1;
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int ii;
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/* If there is only one "firm" touch, set touch to its
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* tracking ID.
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*/
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for (ii = 0; ii < msc->ntouches; ii++) {
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int idx = msc->tracking_ids[ii];
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if (msc->touches[idx].size < 8) {
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/* Ignore this touch. */
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} else if (touch >= 0) {
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touch = -1;
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break;
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} else {
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touch = idx;
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}
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}
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return touch;
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}
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static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
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{
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int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
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test_bit(BTN_RIGHT, msc->input->key) << 1 |
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test_bit(BTN_MIDDLE, msc->input->key) << 2;
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if (emulate_3button) {
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int id;
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/* If some button was pressed before, keep it held
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* down. Otherwise, if there's exactly one firm
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* touch, use that to override the mouse's guess.
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*/
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if (state == 0) {
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/* The button was released. */
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} else if (last_state != 0) {
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state = last_state;
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} else if ((id = magicmouse_firm_touch(msc)) >= 0) {
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int x = msc->touches[id].x;
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if (x < middle_button_start)
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state = 1;
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else if (x > middle_button_stop)
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state = 2;
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else
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state = 4;
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} /* else: we keep the mouse's guess */
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input_report_key(msc->input, BTN_MIDDLE, state & 4);
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}
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input_report_key(msc->input, BTN_LEFT, state & 1);
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input_report_key(msc->input, BTN_RIGHT, state & 2);
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if (state != last_state)
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msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
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}
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static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
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{
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struct input_dev *input = msc->input;
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int id, x, y, size, orientation, touch_major, touch_minor, state, down;
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if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
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id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
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x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
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y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
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size = tdata[5] & 0x3f;
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orientation = (tdata[6] >> 2) - 32;
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touch_major = tdata[3];
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touch_minor = tdata[4];
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state = tdata[7] & TOUCH_STATE_MASK;
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down = state != TOUCH_STATE_NONE;
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} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
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id = (tdata[7] << 2 | tdata[6] >> 6) & 0xf;
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x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
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y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
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size = tdata[6] & 0x3f;
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orientation = (tdata[7] >> 2) - 32;
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touch_major = tdata[4];
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touch_minor = tdata[5];
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state = tdata[8] & TOUCH_STATE_MASK;
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down = state != TOUCH_STATE_NONE;
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}
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/* Store tracking ID and other fields. */
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msc->tracking_ids[raw_id] = id;
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msc->touches[id].x = x;
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msc->touches[id].y = y;
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msc->touches[id].size = size;
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/* If requested, emulate a scroll wheel by detecting small
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* vertical touch motions.
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*/
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if (emulate_scroll_wheel) {
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unsigned long now = jiffies;
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int step_x = msc->touches[id].scroll_x - x;
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int step_y = msc->touches[id].scroll_y - y;
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/* Calculate and apply the scroll motion. */
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switch (state) {
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case TOUCH_STATE_START:
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msc->touches[id].scroll_x = x;
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msc->touches[id].scroll_y = y;
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/* Reset acceleration after half a second. */
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if (scroll_acceleration && time_before(now,
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msc->scroll_jiffies + HZ / 2))
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msc->scroll_accel = max_t(int,
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msc->scroll_accel - 1, 1);
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else
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msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
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break;
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case TOUCH_STATE_DRAG:
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step_x /= (64 - (int)scroll_speed) * msc->scroll_accel;
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if (step_x != 0) {
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msc->touches[id].scroll_x -= step_x *
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(64 - scroll_speed) * msc->scroll_accel;
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msc->scroll_jiffies = now;
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input_report_rel(input, REL_HWHEEL, -step_x);
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}
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step_y /= (64 - (int)scroll_speed) * msc->scroll_accel;
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if (step_y != 0) {
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msc->touches[id].scroll_y -= step_y *
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(64 - scroll_speed) * msc->scroll_accel;
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msc->scroll_jiffies = now;
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input_report_rel(input, REL_WHEEL, step_y);
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}
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break;
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}
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}
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if (down)
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msc->ntouches++;
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input_mt_slot(input, id);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, down);
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/* Generate the input events for this touch. */
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if (down) {
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input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
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input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
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input_report_abs(input, ABS_MT_ORIENTATION, -orientation);
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input_report_abs(input, ABS_MT_POSITION_X, x);
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input_report_abs(input, ABS_MT_POSITION_Y, y);
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if (report_undeciphered) {
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if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
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input_event(input, EV_MSC, MSC_RAW, tdata[7]);
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else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
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input_event(input, EV_MSC, MSC_RAW, tdata[8]);
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}
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}
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}
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static int magicmouse_raw_event(struct hid_device *hdev,
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struct hid_report *report, u8 *data, int size)
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{
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struct magicmouse_sc *msc = hid_get_drvdata(hdev);
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struct input_dev *input = msc->input;
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int x = 0, y = 0, ii, clicks = 0, npoints;
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switch (data[0]) {
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case TRACKPAD_REPORT_ID:
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/* Expect four bytes of prefix, and N*9 bytes of touch data. */
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if (size < 4 || ((size - 4) % 9) != 0)
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return 0;
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npoints = (size - 4) / 9;
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msc->ntouches = 0;
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for (ii = 0; ii < npoints; ii++)
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magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
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clicks = data[1];
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/* The following bits provide a device specific timestamp. They
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* are unused here.
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*
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* ts = data[1] >> 6 | data[2] << 2 | data[3] << 10;
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*/
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break;
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case MOUSE_REPORT_ID:
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/* Expect six bytes of prefix, and N*8 bytes of touch data. */
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if (size < 6 || ((size - 6) % 8) != 0)
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return 0;
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npoints = (size - 6) / 8;
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msc->ntouches = 0;
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for (ii = 0; ii < npoints; ii++)
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magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
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/* When emulating three-button mode, it is important
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* to have the current touch information before
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* generating a click event.
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*/
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x = (int)(((data[3] & 0x0c) << 28) | (data[1] << 22)) >> 22;
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y = (int)(((data[3] & 0x30) << 26) | (data[2] << 22)) >> 22;
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clicks = data[3];
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/* The following bits provide a device specific timestamp. They
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* are unused here.
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*
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* ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
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*/
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break;
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case DOUBLE_REPORT_ID:
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/* Sometimes the trackpad sends two touch reports in one
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* packet.
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*/
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magicmouse_raw_event(hdev, report, data + 2, data[1]);
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magicmouse_raw_event(hdev, report, data + 2 + data[1],
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size - 2 - data[1]);
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break;
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default:
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return 0;
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}
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if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
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magicmouse_emit_buttons(msc, clicks & 3);
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input_report_rel(input, REL_X, x);
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input_report_rel(input, REL_Y, y);
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} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
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input_report_key(input, BTN_MOUSE, clicks & 1);
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input_mt_report_pointer_emulation(input, true);
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}
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input_sync(input);
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return 1;
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}
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static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
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{
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int error;
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__set_bit(EV_KEY, input->evbit);
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if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
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__set_bit(BTN_LEFT, input->keybit);
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__set_bit(BTN_RIGHT, input->keybit);
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if (emulate_3button)
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__set_bit(BTN_MIDDLE, input->keybit);
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__set_bit(EV_REL, input->evbit);
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__set_bit(REL_X, input->relbit);
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__set_bit(REL_Y, input->relbit);
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if (emulate_scroll_wheel) {
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__set_bit(REL_WHEEL, input->relbit);
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__set_bit(REL_HWHEEL, input->relbit);
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}
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} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
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/* input->keybit is initialized with incorrect button info
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* for Magic Trackpad. There really is only one physical
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* button (BTN_LEFT == BTN_MOUSE). Make sure we don't
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* advertise buttons that don't exist...
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*/
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__clear_bit(BTN_RIGHT, input->keybit);
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__clear_bit(BTN_MIDDLE, input->keybit);
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__set_bit(BTN_MOUSE, input->keybit);
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__set_bit(BTN_TOOL_FINGER, input->keybit);
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__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
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__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
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__set_bit(BTN_TOOL_QUADTAP, input->keybit);
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__set_bit(BTN_TOOL_QUINTTAP, input->keybit);
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__set_bit(BTN_TOUCH, input->keybit);
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__set_bit(INPUT_PROP_POINTER, input->propbit);
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__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
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}
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__set_bit(EV_ABS, input->evbit);
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error = input_mt_init_slots(input, 16);
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if (error)
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return error;
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input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255 << 2,
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4, 0);
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input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255 << 2,
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4, 0);
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input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
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/* Note: Touch Y position from the device is inverted relative
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* to how pointer motion is reported (and relative to how USB
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* HID recommends the coordinates work). This driver keeps
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* the origin at the same position, and just uses the additive
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* inverse of the reported Y.
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*/
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if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
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input_set_abs_params(input, ABS_MT_POSITION_X,
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MOUSE_MIN_X, MOUSE_MAX_X, 4, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y,
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MOUSE_MIN_Y, MOUSE_MAX_Y, 4, 0);
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input_abs_set_res(input, ABS_MT_POSITION_X,
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MOUSE_RES_X);
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input_abs_set_res(input, ABS_MT_POSITION_Y,
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MOUSE_RES_Y);
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} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
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input_set_abs_params(input, ABS_X, TRACKPAD_MIN_X,
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TRACKPAD_MAX_X, 4, 0);
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input_set_abs_params(input, ABS_Y, TRACKPAD_MIN_Y,
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TRACKPAD_MAX_Y, 4, 0);
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input_set_abs_params(input, ABS_MT_POSITION_X,
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TRACKPAD_MIN_X, TRACKPAD_MAX_X, 4, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y,
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TRACKPAD_MIN_Y, TRACKPAD_MAX_Y, 4, 0);
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input_abs_set_res(input, ABS_X, TRACKPAD_RES_X);
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input_abs_set_res(input, ABS_Y, TRACKPAD_RES_Y);
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input_abs_set_res(input, ABS_MT_POSITION_X,
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TRACKPAD_RES_X);
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input_abs_set_res(input, ABS_MT_POSITION_Y,
|
|
TRACKPAD_RES_Y);
|
|
}
|
|
|
|
input_set_events_per_packet(input, 60);
|
|
|
|
if (report_undeciphered) {
|
|
__set_bit(EV_MSC, input->evbit);
|
|
__set_bit(MSC_RAW, input->mscbit);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int magicmouse_input_mapping(struct hid_device *hdev,
|
|
struct hid_input *hi, struct hid_field *field,
|
|
struct hid_usage *usage, unsigned long **bit, int *max)
|
|
{
|
|
struct magicmouse_sc *msc = hid_get_drvdata(hdev);
|
|
|
|
if (!msc->input)
|
|
msc->input = hi->input;
|
|
|
|
/* Magic Trackpad does not give relative data after switching to MT */
|
|
if (hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD &&
|
|
field->flags & HID_MAIN_ITEM_RELATIVE)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int magicmouse_probe(struct hid_device *hdev,
|
|
const struct hid_device_id *id)
|
|
{
|
|
__u8 feature[] = { 0xd7, 0x01 };
|
|
struct magicmouse_sc *msc;
|
|
struct hid_report *report;
|
|
int ret;
|
|
|
|
msc = kzalloc(sizeof(*msc), GFP_KERNEL);
|
|
if (msc == NULL) {
|
|
hid_err(hdev, "can't alloc magicmouse descriptor\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
|
|
|
|
msc->quirks = id->driver_data;
|
|
hid_set_drvdata(hdev, msc);
|
|
|
|
ret = hid_parse(hdev);
|
|
if (ret) {
|
|
hid_err(hdev, "magicmouse hid parse failed\n");
|
|
goto err_free;
|
|
}
|
|
|
|
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
|
|
if (ret) {
|
|
hid_err(hdev, "magicmouse hw start failed\n");
|
|
goto err_free;
|
|
}
|
|
|
|
/* We do this after hid-input is done parsing reports so that
|
|
* hid-input uses the most natural button and axis IDs.
|
|
*/
|
|
if (msc->input) {
|
|
ret = magicmouse_setup_input(msc->input, hdev);
|
|
if (ret) {
|
|
hid_err(hdev, "magicmouse setup input failed (%d)\n", ret);
|
|
goto err_stop_hw;
|
|
}
|
|
}
|
|
|
|
if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
|
|
report = hid_register_report(hdev, HID_INPUT_REPORT,
|
|
MOUSE_REPORT_ID);
|
|
else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
|
|
report = hid_register_report(hdev, HID_INPUT_REPORT,
|
|
TRACKPAD_REPORT_ID);
|
|
report = hid_register_report(hdev, HID_INPUT_REPORT,
|
|
DOUBLE_REPORT_ID);
|
|
}
|
|
|
|
if (!report) {
|
|
hid_err(hdev, "unable to register touch report\n");
|
|
ret = -ENOMEM;
|
|
goto err_stop_hw;
|
|
}
|
|
report->size = 6;
|
|
|
|
/*
|
|
* Some devices repond with 'invalid report id' when feature
|
|
* report switching it into multitouch mode is sent to it.
|
|
*
|
|
* This results in -EIO from the _raw low-level transport callback,
|
|
* but there seems to be no other way of switching the mode.
|
|
* Thus the super-ugly hacky success check below.
|
|
*/
|
|
ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
|
|
HID_FEATURE_REPORT);
|
|
if (ret != -EIO && ret != sizeof(feature)) {
|
|
hid_err(hdev, "unable to request touch data (%d)\n", ret);
|
|
goto err_stop_hw;
|
|
}
|
|
|
|
return 0;
|
|
err_stop_hw:
|
|
hid_hw_stop(hdev);
|
|
err_free:
|
|
kfree(msc);
|
|
return ret;
|
|
}
|
|
|
|
static void magicmouse_remove(struct hid_device *hdev)
|
|
{
|
|
struct magicmouse_sc *msc = hid_get_drvdata(hdev);
|
|
|
|
hid_hw_stop(hdev);
|
|
kfree(msc);
|
|
}
|
|
|
|
static const struct hid_device_id magic_mice[] = {
|
|
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
|
|
USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
|
|
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
|
|
USB_DEVICE_ID_APPLE_MAGICTRACKPAD), .driver_data = 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(hid, magic_mice);
|
|
|
|
static struct hid_driver magicmouse_driver = {
|
|
.name = "magicmouse",
|
|
.id_table = magic_mice,
|
|
.probe = magicmouse_probe,
|
|
.remove = magicmouse_remove,
|
|
.raw_event = magicmouse_raw_event,
|
|
.input_mapping = magicmouse_input_mapping,
|
|
};
|
|
|
|
static int __init magicmouse_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = hid_register_driver(&magicmouse_driver);
|
|
if (ret)
|
|
pr_err("can't register magicmouse driver\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit magicmouse_exit(void)
|
|
{
|
|
hid_unregister_driver(&magicmouse_driver);
|
|
}
|
|
|
|
module_init(magicmouse_init);
|
|
module_exit(magicmouse_exit);
|
|
MODULE_LICENSE("GPL");
|