![Henrik Rydberg](/assets/img/avatar_default.png)
By visual inspection, the reported touch_major and touch_minor axes are roughly a factor of four too small. The factor is approximate, since the protocol is not known and the HID report encodes touch size with fewer bits than positions. This patch scales the reported values by a factor of four. Signed-off-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Chase Douglas <chase.douglas@canonical.com> Acked-by: Michael Poole <mdpoole@troilus.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
556 lines
16 KiB
C
556 lines
16 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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#include <linux/device.h>
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#include <linux/hid.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_touches = true;
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module_param(report_touches, bool, 0644);
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MODULE_PARM_DESC(report_touches, "Emit touch records (otherwise, only use them for emulation)");
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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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/* Single touch emulation should only begin when no touches are currently down.
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* This is true when single_touch_id is equal to NO_TOUCHES. If multiple touches
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* are down and the touch providing for single touch emulation is lifted,
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* single_touch_id is equal to SINGLE_TOUCH_UP. While single touch emulation is
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* occuring, single_touch_id corresponds with the tracking id of the touch used.
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*/
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#define NO_TOUCHES -1
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#define SINGLE_TOUCH_UP -2
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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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int single_touch_id;
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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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if (msc->single_touch_id == NO_TOUCHES)
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msc->single_touch_id = id;
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} else if (msc->single_touch_id == id)
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msc->single_touch_id = SINGLE_TOUCH_UP;
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/* Generate the input events for this touch. */
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if (report_touches && down) {
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input_report_abs(input, ABS_MT_TRACKING_ID, id);
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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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input_mt_sync(input);
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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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/* We don't need an MT sync here because trackpad emits a
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* BTN_TOUCH event in a new frame when all touches are released.
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*/
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if (msc->ntouches == 0)
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msc->single_touch_id = NO_TOUCHES;
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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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if (report_touches && msc->ntouches == 0)
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input_mt_sync(input);
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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_report_key(input, BTN_TOUCH, msc->ntouches > 0);
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input_report_key(input, BTN_TOOL_FINGER, msc->ntouches == 1);
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input_report_key(input, BTN_TOOL_DOUBLETAP, msc->ntouches == 2);
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input_report_key(input, BTN_TOOL_TRIPLETAP, msc->ntouches == 3);
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input_report_key(input, BTN_TOOL_QUADTAP, msc->ntouches == 4);
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if (msc->single_touch_id >= 0) {
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input_report_abs(input, ABS_X,
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msc->touches[msc->single_touch_id].x);
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input_report_abs(input, ABS_Y,
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msc->touches[msc->single_touch_id].y);
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}
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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 void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
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{
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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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__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_TOUCH, input->keybit);
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}
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if (report_touches) {
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__set_bit(EV_ABS, input->evbit);
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input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 15, 0, 0);
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input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 4, 0);
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input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 4, 0);
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input_set_abs_params(input, ABS_MT_ORIENTATION, -32, 31, 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, -1100,
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1358, 4, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, -1589,
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2047, 4, 0);
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} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
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input_set_abs_params(input, ABS_X, -2909, 3167, 4, 0);
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input_set_abs_params(input, ABS_Y, -2456, 2565, 4, 0);
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input_set_abs_params(input, ABS_MT_POSITION_X, -2909,
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3167, 4, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, -2456,
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2565, 4, 0);
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}
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}
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if (report_undeciphered) {
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__set_bit(EV_MSC, input->evbit);
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__set_bit(MSC_RAW, input->mscbit);
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}
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}
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static int magicmouse_input_mapping(struct hid_device *hdev,
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struct hid_input *hi, struct hid_field *field,
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struct hid_usage *usage, unsigned long **bit, int *max)
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{
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struct magicmouse_sc *msc = hid_get_drvdata(hdev);
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if (!msc->input)
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msc->input = hi->input;
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return 0;
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}
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static int magicmouse_probe(struct hid_device *hdev,
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const struct hid_device_id *id)
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{
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__u8 feature[] = { 0xd7, 0x01 };
|
|
struct magicmouse_sc *msc;
|
|
struct hid_report *report;
|
|
int ret;
|
|
|
|
msc = kzalloc(sizeof(*msc), GFP_KERNEL);
|
|
if (msc == NULL) {
|
|
dev_err(&hdev->dev, "can't alloc magicmouse descriptor\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
|
|
|
|
msc->quirks = id->driver_data;
|
|
hid_set_drvdata(hdev, msc);
|
|
|
|
msc->single_touch_id = NO_TOUCHES;
|
|
|
|
ret = hid_parse(hdev);
|
|
if (ret) {
|
|
dev_err(&hdev->dev, "magicmouse hid parse failed\n");
|
|
goto err_free;
|
|
}
|
|
|
|
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
|
|
if (ret) {
|
|
dev_err(&hdev->dev, "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)
|
|
magicmouse_setup_input(msc->input, hdev);
|
|
|
|
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) {
|
|
dev_err(&hdev->dev, "unable to register touch report\n");
|
|
ret = -ENOMEM;
|
|
goto err_stop_hw;
|
|
}
|
|
report->size = 6;
|
|
|
|
ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
|
|
HID_FEATURE_REPORT);
|
|
if (ret != sizeof(feature)) {
|
|
dev_err(&hdev->dev, "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)
|
|
printk(KERN_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");
|