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/*
* Apple "Magic" Wireless Mouse driver
*
* Copyright (c) 2010 Michael Poole <mdpoole@troilus.org>
* Copyright (c) 2010 Chase Douglas <chase.douglas@canonical.com>
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/input/mt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "hid-ids.h"
static bool emulate_3button = true;
module_param(emulate_3button, bool, 0644);
MODULE_PARM_DESC(emulate_3button, "Emulate a middle button");
static int middle_button_start = -350;
static int middle_button_stop = +350;
static bool emulate_scroll_wheel = true;
module_param(emulate_scroll_wheel, bool, 0644);
MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
static unsigned int scroll_speed = 32;
static int param_set_scroll_speed(const char *val, struct kernel_param *kp) {
unsigned long speed;
if (!val || kstrtoul(val, 0, &speed) || speed > 63)
return -EINVAL;
scroll_speed = speed;
return 0;
}
module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
static bool scroll_acceleration = false;
module_param(scroll_acceleration, bool, 0644);
MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
static bool report_undeciphered;
module_param(report_undeciphered, bool, 0644);
MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
#define TRACKPAD_REPORT_ID 0x28
#define MOUSE_REPORT_ID 0x29
#define DOUBLE_REPORT_ID 0xf7
/* These definitions are not precise, but they're close enough. (Bits
* 0x03 seem to indicate the aspect ratio of the touch, bits 0x70 seem
* to be some kind of bit mask -- 0x20 may be a near-field reading,
* and 0x40 is actual contact, and 0x10 may be a start/stop or change
* indication.)
*/
#define TOUCH_STATE_MASK 0xf0
#define TOUCH_STATE_NONE 0x00
#define TOUCH_STATE_START 0x30
#define TOUCH_STATE_DRAG 0x40
#define SCROLL_ACCEL_DEFAULT 7
/* Touch surface information. Dimension is in hundredths of a mm, min and max
* are in units. */
#define MOUSE_DIMENSION_X (float)9056
#define MOUSE_MIN_X -1100
#define MOUSE_MAX_X 1258
#define MOUSE_RES_X ((MOUSE_MAX_X - MOUSE_MIN_X) / (MOUSE_DIMENSION_X / 100))
#define MOUSE_DIMENSION_Y (float)5152
#define MOUSE_MIN_Y -1589
#define MOUSE_MAX_Y 2047
#define MOUSE_RES_Y ((MOUSE_MAX_Y - MOUSE_MIN_Y) / (MOUSE_DIMENSION_Y / 100))
#define TRACKPAD_DIMENSION_X (float)13000
#define TRACKPAD_MIN_X -2909
#define TRACKPAD_MAX_X 3167
#define TRACKPAD_RES_X \
((TRACKPAD_MAX_X - TRACKPAD_MIN_X) / (TRACKPAD_DIMENSION_X / 100))
#define TRACKPAD_DIMENSION_Y (float)11000
#define TRACKPAD_MIN_Y -2456
#define TRACKPAD_MAX_Y 2565
#define TRACKPAD_RES_Y \
((TRACKPAD_MAX_Y - TRACKPAD_MIN_Y) / (TRACKPAD_DIMENSION_Y / 100))
/**
* struct magicmouse_sc - Tracks Magic Mouse-specific data.
* @input: Input device through which we report events.
* @quirks: Currently unused.
* @ntouches: Number of touches in most recent touch report.
* @scroll_accel: Number of consecutive scroll motions.
* @scroll_jiffies: Time of last scroll motion.
* @touches: Most recent data for a touch, indexed by tracking ID.
* @tracking_ids: Mapping of current touch input data to @touches.
*/
struct magicmouse_sc {
struct input_dev *input;
unsigned long quirks;
int ntouches;
int scroll_accel;
unsigned long scroll_jiffies;
struct {
short x;
short y;
short scroll_x;
short scroll_y;
u8 size;
} touches[16];
int tracking_ids[16];
};
static int magicmouse_firm_touch(struct magicmouse_sc *msc)
{
int touch = -1;
int ii;
/* If there is only one "firm" touch, set touch to its
* tracking ID.
*/
for (ii = 0; ii < msc->ntouches; ii++) {
int idx = msc->tracking_ids[ii];
if (msc->touches[idx].size < 8) {
/* Ignore this touch. */
} else if (touch >= 0) {
touch = -1;
break;
} else {
touch = idx;
}
}
return touch;
}
static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
{
int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
test_bit(BTN_RIGHT, msc->input->key) << 1 |
test_bit(BTN_MIDDLE, msc->input->key) << 2;
if (emulate_3button) {
int id;
/* If some button was pressed before, keep it held
* down. Otherwise, if there's exactly one firm
* touch, use that to override the mouse's guess.
*/
if (state == 0) {
/* The button was released. */
} else if (last_state != 0) {
state = last_state;
} else if ((id = magicmouse_firm_touch(msc)) >= 0) {
int x = msc->touches[id].x;
if (x < middle_button_start)
state = 1;
else if (x > middle_button_stop)
state = 2;
else
state = 4;
} /* else: we keep the mouse's guess */
input_report_key(msc->input, BTN_MIDDLE, state & 4);
}
input_report_key(msc->input, BTN_LEFT, state & 1);
input_report_key(msc->input, BTN_RIGHT, state & 2);
if (state != last_state)
msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
}
static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
{
struct input_dev *input = msc->input;
int id, x, y, size, orientation, touch_major, touch_minor, state, down;
if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
size = tdata[5] & 0x3f;
orientation = (tdata[6] >> 2) - 32;
touch_major = tdata[3];
touch_minor = tdata[4];
state = tdata[7] & TOUCH_STATE_MASK;
down = state != TOUCH_STATE_NONE;
} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
id = (tdata[7] << 2 | tdata[6] >> 6) & 0xf;
x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
size = tdata[6] & 0x3f;
orientation = (tdata[7] >> 2) - 32;
touch_major = tdata[4];
touch_minor = tdata[5];
state = tdata[8] & TOUCH_STATE_MASK;
down = state != TOUCH_STATE_NONE;
}
/* Store tracking ID and other fields. */
msc->tracking_ids[raw_id] = id;
msc->touches[id].x = x;
msc->touches[id].y = y;
msc->touches
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