/*
* Apple "Magic" Wireless Mouse driver
*
* Copyright (c) 2010 Michael Poole <mdpoole@troilus.org>
*/
/*
* 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.
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.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 bool report_touches = true;
module_param(report_touches, bool, 0644);
MODULE_PARM_DESC(report_touches, "Emit touch records (otherwise, only use them for emulation)");
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 TOUCH_REPORT_ID 0x29
/* 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
/**
* struct magicmouse_sc - Tracks Magic Mouse-specific data.
* @input: Input device through which we report events.
* @quirks: Currently unused.
* @last_timestamp: Timestamp from most recent (18-bit) touch report
* (units of milliseconds over short windows, but seems to
* increase faster when there are no touches).
* @delta_time: 18-bit difference between the two most recent touch
* reports from the mouse.
* @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 last_timestamp;
int delta_time;
int ntouches;
int scroll_accel;
unsigned long scroll_jiffies;
struct {
short x;
short y;
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 = 0;
}
static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
{
struct input_dev *input = msc->input;
__s32 x_y = tdata[0] << 8 | tdata[1] << 16 | tdata[2] << 24;
int misc = tdata[5] | tdata[6] << 8;
int id = (misc >> 6) & 15;
int x = x_y << 12 >> 20;
int y = -(x_y >> 20);
/* Store tracking ID and other fields. */
msc->tracking_ids[raw_id] = id;
msc->touches[id].x = x;
msc->touches[id].y = y;
msc->touches[id].size = misc & 63;
/* If requested, emulate a scroll wheel by detecting small
* vertical touch motions along the middle of the mouse.
*/
if (emulate_scroll_wheel &&
middle_button_start < x && x < middle_button_stop) {
static const int accel_profile[] = {
256, 228, 192, 160, 128, 96, 64, 32,
};
unsigned long now = jiffies;
int step = msc->touches[id].scroll_y - y;
/* Reset acceleration after half a second. */
if (time_after(now, msc->scroll_jiffies + HZ / 2))
msc->scroll_accel = 0;
/* Calculate and apply the scroll motion. */
switch (tdata[7] & TOUCH_STATE_MASK) {
case TOUCH_STATE_START:
msc->touches[id].scroll_y = y;
msc->scroll_accel = min_t(int, msc->scroll_accel + 1,
ARRAY_SIZE(accel_profile) - 1);
break;
case TOUCH_STATE_DRAG:
step = step / accel_profile[msc->scroll_accel];
if (step != 0) {
msc->touches[id].scroll_y = y;
msc->scroll_jiffies = now;
input_report_rel(input, REL_WHEEL, step);
}
break;
}
}
/* Generate the input events for this touch. */
if (report_touches) {
int orientation = (misc >> 10) - 32;
input_report_abs(input, ABS_MT_TRACKING_ID, id);
input_report_abs(input, ABS_MT_TOUCH_MAJOR, tdata[3]);
input_report_abs(input, ABS_MT_TOUCH_MINOR, tdata[4]);
input_report_abs(input, ABS_MT_ORIENTATION, orientation);
input_report_abs(input, ABS_MT_POSITION_X, x);
input_report_abs(input, ABS_MT_POSITION_Y, y);
if (report_undeciphered)
input_event(input, EV_MSC, MSC_RAW, tdata[7]);
input_mt_sync(input);
}
}
static int magicmouse_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data, int size)
{
struct magicmouse_sc *msc = hid_get_drvdata(hdev);
struct input_dev *input = msc->input;
int x, y, ts, ii, clicks;
switch (data[0]) {
case 0x10:
if (size != 6)
return 0;
x = (__s16)(data[2] | data[3] << 8);
y = (__s16)(data[4] | data[5] << 8);
clicks = data[1];
break;
case TOUCH_REPORT_ID:
/* Expect six bytes of prefix, and N*8 bytes of touch data. */
if (size < 6 || ((size - 6) % 8) != 0)
return 0;
ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
msc->delta_time = (ts - msc->last_timestamp) & 0x3ffff;
msc->last_timestamp = ts;
msc->ntouches = (size - 6) / 8;
for (ii = 0; ii < msc->ntouches; ii++)
magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
/* When emulating three-button mode, it is important
* to have the current touch information before
* generating a click event.
*/
x = (signed char)data[1];
y = (signed char)data[2];
clicks = data[3];
break;
case 0x20: /* Theoretically battery status (0-100), but I have
* never seen it -- maybe it is only upon request.
*/
case 0x60: /* Unknown, maybe laser on/off. */
case 0x61: /* Laser reflection status change.
* data[1]: 0 = spotted, 1 = lost
*/
default:
return 0;
}
magicmouse_emit_buttons(msc, clicks & 3);
input_report_rel(input, REL_X, x);
input_report_rel(input, REL_Y, y);
input_sync(input);
return 1;
}
static int magicmouse_input_open(struct input_dev *dev)
{
struct hid_device *hid = input_get_drvdata(dev);
return hid->ll_driver->open(hid);
}
static void magicmouse_input_close(struct input_dev *dev)
{
struct hid_device *hid = input_get_drvdata(dev);
hid->ll_driver->close(hid);
}
static void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
{
input_set_drvdata(input, hdev);
input->event = hdev->ll_driver->hidinput_input_event;
input->open = magicmouse_input_open;
input->close = magicmouse_input_close;
input->name = hdev->name;
input->phys = hdev->phys;
input->uniq = hdev->uniq;
input->id.bustype = hdev->bus;
input->id.vendor = hdev->vendor;
input->id.product = hdev->product;
input->id.version = hdev->version;
input->dev.parent = hdev->dev.parent;
__set_bit(EV_KEY, input->evbit);
__set_bit(BTN_LEFT, input->keybit);
__set_bit(BTN_RIGHT, input->keybit);
if (emulate_3button)
__set_bit(BTN_MIDDLE, input->keybit);
__set_bit(BTN_TOOL_FINGER, input->keybit);
__set_bit(EV_REL, input->evbit);
__set_bit(REL_X, input->relbit);
__set_bit(REL_Y, input->relbit);
if (emulate_scroll_wheel)
__set_bit(REL_WHEEL, input->relbit);
if (report_touches) {
__set_bit(EV_ABS, input->evbit);
input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 15, 0, 0);
input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 4, 0);
input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 4, 0);
input_set_abs_params(input, ABS_MT_ORIENTATION, -32, 31, 1, 0);
input_set_abs_params(input, ABS_MT_POSITION_X, -1100, 1358,
4, 0);
/* Note: Touch Y position from the device is inverted relative
* to how pointer motion is reported (and relative to how USB
* HID recommends the coordinates work). This driver keeps
* the origin at the same position, and just uses the additive
* inverse of the reported Y.
*/
input_set_abs_params(input, ABS_MT_POSITION_Y, -1589, 2047,
4, 0);
}
if (report_undeciphered) {
__set_bit(EV_MSC, input->evbit);
__set_bit(MSC_RAW, input->mscbit);
}
}
static int magicmouse_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
__u8 feature_1[] = { 0xd7, 0x01 };
__u8 feature_2[] = { 0xf8, 0x01, 0x32 };
struct input_dev *input;
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->quirks = id->driver_data;
hid_set_drvdata(hdev, msc);
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 are handling the input ourselves */
hidinput_disconnect(hdev);
report = hid_register_report(hdev, HID_INPUT_REPORT, TOUCH_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_1, sizeof(feature_1),
HID_FEATURE_REPORT);
if (ret != sizeof(feature_1)) {
dev_err(&hdev->dev, "unable to request touch data (1:%d)\n",
ret);
goto err_stop_hw;
}
ret = hdev->hid_output_raw_report(hdev, feature_2,
sizeof(feature_2), HID_FEATURE_REPORT);
if (ret != sizeof(feature_2)) {
dev_err(&hdev->dev, "unable to request touch data (2:%d)\n",
ret);
goto err_stop_hw;
}
input = input_allocate_device();
if (!input) {
dev_err(&hdev->dev, "can't alloc input device\n");
ret = -ENOMEM;
goto err_stop_hw;
}
magicmouse_setup_input(input, hdev);
ret = input_register_device(input);
if (ret) {
dev_err(&hdev->dev, "input device registration failed\n");
goto err_input;
}
msc->input = input;
return 0;
err_input:
input_free_device(input);
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);
input_unregister_device(msc->input);
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 },
{ }
};
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,
};
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");
