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SubjectRe: [PATCH] HID: add support for Apple Magic Trackpad 2
Hi Sean,

On Tue, Aug 28, 2018 at 3:29 AM Sean O'Brien <seobrien@chromium.org> wrote:
>
> USB device
> Vendor 05ac (Apple)
> Device 0265 (Magic Trackpad 2)
> Bluetooth device
> Vendor 004c (Apple)
> Device 0265 (Magic Trackpad 2)
>
> Add support for Apple Magic Trackpad 2 over USB and bluetooth, putting
> the device in multi-touch mode.
>
> Signed-off-by: Claudio Mettler <claudio@ponyfleisch.ch>
> Signed-off-by: Marek Wyborski <marek.wyborski@emwesoft.com>
> Signed-off-by: Sean O'Brien <seobrien@chromium.org>
> ---

A few nitpicks, otherwise looks good. I must confess this driver is
depressing and we could surely simplify it a lot by rewriting their
report descriptors.

>
> drivers/hid/hid-ids.h | 2 +
> drivers/hid/hid-magicmouse.c | 187 ++++++++++++++++++++++++++++-------
> 2 files changed, 152 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 79bdf0c7e351..d6d0b20cc015 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -88,9 +88,11 @@
> #define USB_DEVICE_ID_ANTON_TOUCH_PAD 0x3101
>
> #define USB_VENDOR_ID_APPLE 0x05ac
> +#define BT_VENDOR_ID_APPLE 0x004c
> #define USB_DEVICE_ID_APPLE_MIGHTYMOUSE 0x0304
> #define USB_DEVICE_ID_APPLE_MAGICMOUSE 0x030d
> #define USB_DEVICE_ID_APPLE_MAGICTRACKPAD 0x030e
> +#define USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 0x0265
> #define USB_DEVICE_ID_APPLE_FOUNTAIN_ANSI 0x020e
> #define USB_DEVICE_ID_APPLE_FOUNTAIN_ISO 0x020f
> #define USB_DEVICE_ID_APPLE_GEYSER_ANSI 0x0214
> diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
> index b454c4386157..34152d2d2221 100644
> --- a/drivers/hid/hid-magicmouse.c
> +++ b/drivers/hid/hid-magicmouse.c
> @@ -19,6 +19,7 @@
> #include <linux/input/mt.h>
> #include <linux/module.h>
> #include <linux/slab.h>
> +#include <linux/usb/input.h>

Please don't. HID should not directly use the transport layer as it
will break any attempt to replay the devices through uhid.

>
> #include "hid-ids.h"
>
> @@ -54,6 +55,8 @@ 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 TRACKPAD2_USB_REPORT_ID 0x02
> +#define TRACKPAD2_BT_REPORT_ID 0x31
> #define MOUSE_REPORT_ID 0x29
> #define DOUBLE_REPORT_ID 0xf7
> /* These definitions are not precise, but they're close enough. (Bits
> @@ -91,6 +94,19 @@ MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state fie
> #define TRACKPAD_RES_Y \
> ((TRACKPAD_MAX_Y - TRACKPAD_MIN_Y) / (TRACKPAD_DIMENSION_Y / 100))
>
> +#define TRACKPAD2_DIMENSION_X (float)16000
> +#define TRACKPAD2_MIN_X -3678
> +#define TRACKPAD2_MAX_X 3934
> +#define TRACKPAD2_RES_X \
> + ((TRACKPAD2_MAX_X - TRACKPAD2_MIN_X) / (TRACKPAD2_DIMENSION_X / 100))
> +#define TRACKPAD2_DIMENSION_Y (float)11490
> +#define TRACKPAD2_MIN_Y -2478
> +#define TRACKPAD2_MAX_Y 2587
> +#define TRACKPAD2_RES_Y \
> + ((TRACKPAD2_MAX_Y - TRACKPAD2_MIN_Y) / (TRACKPAD2_DIMENSION_Y / 100))
> +
> +#define MAX_TOUCHES 16
> +
> /**
> * struct magicmouse_sc - Tracks Magic Mouse-specific data.
> * @input: Input device through which we report events.
> @@ -115,8 +131,8 @@ struct magicmouse_sc {
> short scroll_x;
> short scroll_y;
> u8 size;
> - } touches[16];
> - int tracking_ids[16];
> + } touches[MAX_TOUCHES];
> + int tracking_ids[MAX_TOUCHES];
> };
>
> static int magicmouse_firm_touch(struct magicmouse_sc *msc)
> @@ -183,6 +199,7 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
> {
> struct input_dev *input = msc->input;
> int id, x, y, size, orientation, touch_major, touch_minor, state, down;
> + int pressure = 0;
>
> if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
> id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
> @@ -194,7 +211,7 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
> touch_minor = tdata[4];
> state = tdata[7] & TOUCH_STATE_MASK;
> down = state != TOUCH_STATE_NONE;
> - } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
> + } else if (input->id.product == 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);
> @@ -204,6 +221,17 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
> touch_minor = tdata[5];
> state = tdata[8] & TOUCH_STATE_MASK;
> down = state != TOUCH_STATE_NONE;
> + } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 */
> + id = tdata[8] & 0xf;
> + x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
> + y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
> + size = tdata[6];
> + orientation = (tdata[8] >> 5) - 4;
> + touch_major = tdata[4];
> + touch_minor = tdata[5];
> + pressure = tdata[7];
> + state = tdata[3] & 0xC0;
> + down = state == 0x80;
> }
>
> /* Store tracking ID and other fields. */
> @@ -215,7 +243,8 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
> /* If requested, emulate a scroll wheel by detecting small
> * vertical touch motions.
> */
> - if (emulate_scroll_wheel) {
> + if (emulate_scroll_wheel &&
> + (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE)) {
> unsigned long now = jiffies;
> int step_x = msc->touches[id].scroll_x - x;
> int step_y = msc->touches[id].scroll_y - y;
> @@ -258,7 +287,7 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
> if (down)
> msc->ntouches++;
>
> - input_mt_slot(input, id);
> + input_mt_slot(input, input_mt_get_slot_by_key(input, id));
> input_mt_report_slot_state(input, MT_TOOL_FINGER, down);
>
> /* Generate the input events for this touch. */
> @@ -269,10 +298,14 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
> input_report_abs(input, ABS_MT_POSITION_X, x);
> input_report_abs(input, ABS_MT_POSITION_Y, y);
>
> + if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)
> + input_report_abs(input, ABS_MT_PRESSURE, pressure + 30);

I'd rather not have the magic '+ 30' here. Please add it when
processing USB_DEVICE_ID_APPLE_MAGICTRACKPAD2, and also explain where
this constant comes from.

> +
> if (report_undeciphered) {
> if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
> input_event(input, EV_MSC, MSC_RAW, tdata[7]);
> - else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
> + else if (input->id.product ==
> + USB_DEVICE_ID_APPLE_MAGICTRACKPAD)
> input_event(input, EV_MSC, MSC_RAW, tdata[8]);
> }
> }
> @@ -283,14 +316,23 @@ static int magicmouse_raw_event(struct hid_device *hdev,
> {
> struct magicmouse_sc *msc = hid_get_drvdata(hdev);
> struct input_dev *input = msc->input;
> - int x = 0, y = 0, ii, clicks = 0, npoints;
> + int x = 0, y = 0, ii, clicks = 0, npoints, prefix_size;
>
> switch (data[0]) {
> case TRACKPAD_REPORT_ID:
> - /* Expect four bytes of prefix, and N*9 bytes of touch data. */
> - if (size < 4 || ((size - 4) % 9) != 0)
> + case TRACKPAD2_BT_REPORT_ID:
> + case TRACKPAD2_USB_REPORT_ID:
> + /* Expect four or twelve bytes of prefix, and N*9 bytes of
> + * touch data.
> + */
> + if (data[0] == TRACKPAD_REPORT_ID ||
> + data[0] == TRACKPAD2_BT_REPORT_ID)
> + prefix_size = 4;
> + else /*TRACKPAD2_USB_REPORT_ID*/
> + prefix_size = 12;
> + if (size < prefix_size || ((size - prefix_size) % 9) != 0)
> return 0;
> - npoints = (size - 4) / 9;
> + npoints = (size - prefix_size) / 9;
> if (npoints > 15) {
> hid_warn(hdev, "invalid size value (%d) for TRACKPAD_REPORT_ID\n",
> size);
> @@ -298,15 +340,10 @@ static int magicmouse_raw_event(struct hid_device *hdev,
> }
> msc->ntouches = 0;
> for (ii = 0; ii < npoints; ii++)
> - magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
> + magicmouse_emit_touch(msc, ii,
> + data + ii * 9 + prefix_size);
>
> clicks = data[1];
> -
> - /* The following bits provide a device specific timestamp. They
> - * are unused here.
> - *
> - * ts = data[1] >> 6 | data[2] << 2 | data[3] << 10;
> - */
> break;
> case MOUSE_REPORT_ID:
> /* Expect six bytes of prefix, and N*8 bytes of touch data. */
> @@ -352,9 +389,12 @@ static int magicmouse_raw_event(struct hid_device *hdev,
> magicmouse_emit_buttons(msc, clicks & 3);
> input_report_rel(input, REL_X, x);
> input_report_rel(input, REL_Y, y);
> - } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
> + } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD) {
> input_report_key(input, BTN_MOUSE, clicks & 1);
> input_mt_report_pointer_emulation(input, true);
> + } else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 */ {
> + input_mt_sync_frame(input);
> + input_report_key(input, BTN_MOUSE, clicks & 1);
> }
>
> input_sync(input);
> @@ -364,6 +404,7 @@ static int magicmouse_raw_event(struct hid_device *hdev,
> static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
> {
> int error;
> + int mt_flags = 0;
>
> __set_bit(EV_KEY, input->evbit);
>
> @@ -380,7 +421,7 @@ static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hd
> __set_bit(REL_WHEEL, input->relbit);
> __set_bit(REL_HWHEEL, input->relbit);
> }
> - } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
> + } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD) {
> /* input->keybit is initialized with incorrect button info
> * for Magic Trackpad. There really is only one physical
> * button (BTN_LEFT == BTN_MOUSE). Make sure we don't
> @@ -397,19 +438,35 @@ static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hd
> __set_bit(BTN_TOUCH, input->keybit);
> __set_bit(INPUT_PROP_POINTER, input->propbit);
> __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
> + } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) */
> +
> + /* setting the device name to ensure the same driver settings
> + * get loaded, whether connected through bluetooth or USB
> + */
> + input->name = "Apple Inc. Magic Trackpad 2";
> +
> + __clear_bit(EV_MSC, input->evbit);
> + __clear_bit(BTN_0, input->keybit);
> + __clear_bit(BTN_RIGHT, input->keybit);
> + __clear_bit(BTN_MIDDLE, input->keybit);
> + __set_bit(BTN_MOUSE, input->keybit);
> + __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
> + __set_bit(BTN_TOOL_FINGER, input->keybit);
> +
> + mt_flags = INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
> + INPUT_MT_TRACK;
> }
>
>
> __set_bit(EV_ABS, input->evbit);
>
> - error = input_mt_init_slots(input, 16, 0);
> + error = input_mt_init_slots(input, MAX_TOUCHES, mt_flags);
> if (error)
> return error;
> input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255 << 2,
> 4, 0);
> input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255 << 2,
> 4, 0);
> - input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
>
> /* Note: Touch Y position from the device is inverted relative
> * to how pointer motion is reported (and relative to how USB
> @@ -418,6 +475,7 @@ static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hd
> * inverse of the reported Y.
> */
> if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
> + input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
> input_set_abs_params(input, ABS_MT_POSITION_X,
> MOUSE_MIN_X, MOUSE_MAX_X, 4, 0);
> input_set_abs_params(input, ABS_MT_POSITION_Y,
> @@ -427,7 +485,8 @@ static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hd
> MOUSE_RES_X);
> input_abs_set_res(input, ABS_MT_POSITION_Y,
> MOUSE_RES_Y);
> - } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
> + } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD) {
> + input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
> input_set_abs_params(input, ABS_X, TRACKPAD_MIN_X,
> TRACKPAD_MAX_X, 4, 0);
> input_set_abs_params(input, ABS_Y, TRACKPAD_MIN_Y,
> @@ -443,11 +502,29 @@ static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hd
> TRACKPAD_RES_X);
> input_abs_set_res(input, ABS_MT_POSITION_Y,
> TRACKPAD_RES_Y);
> + } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 */
> + input_set_abs_params(input, ABS_MT_PRESSURE, 0, 283, 0, 0);
> + input_set_abs_params(input, ABS_PRESSURE, 0, 283, 0, 0);
> + input_set_abs_params(input, ABS_MT_ORIENTATION, -3, 4, 0, 0);
> + input_set_abs_params(input, ABS_X, TRACKPAD2_MIN_X,
> + TRACKPAD2_MAX_X, 0, 0);
> + input_set_abs_params(input, ABS_Y, TRACKPAD2_MIN_Y,
> + TRACKPAD2_MAX_Y, 0, 0);
> + input_set_abs_params(input, ABS_MT_POSITION_X,
> + TRACKPAD2_MIN_X, TRACKPAD2_MAX_X, 0, 0);
> + input_set_abs_params(input, ABS_MT_POSITION_Y,
> + TRACKPAD2_MIN_Y, TRACKPAD2_MAX_Y, 0, 0);
> +
> + input_abs_set_res(input, ABS_X, TRACKPAD2_RES_X);
> + input_abs_set_res(input, ABS_Y, TRACKPAD2_RES_Y);
> + input_abs_set_res(input, ABS_MT_POSITION_X, TRACKPAD2_RES_X);
> + input_abs_set_res(input, ABS_MT_POSITION_Y, TRACKPAD2_RES_Y);
> }
>
> input_set_events_per_packet(input, 60);
>
> - if (report_undeciphered) {
> + if (report_undeciphered &&
> + input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
> __set_bit(EV_MSC, input->evbit);
> __set_bit(MSC_RAW, input->mscbit);
> }
> @@ -465,7 +542,8 @@ static int magicmouse_input_mapping(struct hid_device *hdev,
> 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 &&
> + if ((hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD ||
> + hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) &&
> field->flags & HID_MAIN_ITEM_RELATIVE)
> return -1;
>
> @@ -494,11 +572,22 @@ static int magicmouse_input_configured(struct hid_device *hdev,
> static int magicmouse_probe(struct hid_device *hdev,
> const struct hid_device_id *id)
> {
> - const u8 feature[] = { 0xd7, 0x01 };
> - u8 *buf;
> + __u8 feature_mt[] = { 0xD7, 0x01 };
> + __u8 feature_mt_trackpad2_usb[] = { 0x02, 0x01 };
> + __u8 feature_mt_trackpad2_bt[] = { 0xF1, 0x02, 0x01 };
> + __u8 *feature;
> struct magicmouse_sc *msc;
> struct hid_report *report;
> int ret;
> + int feature_size;
> + struct usb_interface *intf;
> +
> + if (id->vendor == USB_VENDOR_ID_APPLE &&
> + id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
> + intf = to_usb_interface(hdev->dev.parent);
> + if (intf->cur_altsetting->desc.bInterfaceNumber != 1)

As mentioned at the beginning, can you detect this based on the
application of the HID device, or the usage? It would allow to replay
the device without crashing the entire system. Worth case, if the
application can't help you here, looking at the report descriptor
should provide the information.

> + return 0;
> + }
>
> msc = devm_kzalloc(&hdev->dev, sizeof(*msc), GFP_KERNEL);
> if (msc == NULL) {
> @@ -532,11 +621,18 @@ static int magicmouse_probe(struct hid_device *hdev,
> if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
> report = hid_register_report(hdev, HID_INPUT_REPORT,
> MOUSE_REPORT_ID, 0);
> - else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
> + else if (id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD) {
> report = hid_register_report(hdev, HID_INPUT_REPORT,
> TRACKPAD_REPORT_ID, 0);
> report = hid_register_report(hdev, HID_INPUT_REPORT,
> DOUBLE_REPORT_ID, 0);
> + } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 */
> + if (id->vendor == BT_VENDOR_ID_APPLE)
> + report = hid_register_report(hdev, HID_INPUT_REPORT,
> + TRACKPAD2_BT_REPORT_ID, 0);
> + else /* USB_VENDOR_ID_APPLE */
> + report = hid_register_report(hdev, HID_INPUT_REPORT,
> + TRACKPAD2_USB_REPORT_ID, 0);
> }
>
> if (!report) {
> @@ -546,12 +642,6 @@ static int magicmouse_probe(struct hid_device *hdev,
> }
> report->size = 6;
>
> - buf = kmemdup(feature, sizeof(feature), GFP_KERNEL);
> - if (!buf) {
> - ret = -ENOMEM;
> - goto err_stop_hw;
> - }
> -
> /*
> * Some devices repond with 'invalid report id' when feature
> * report switching it into multitouch mode is sent to it.
> @@ -560,10 +650,29 @@ static int magicmouse_probe(struct hid_device *hdev,
> * but there seems to be no other way of switching the mode.
> * Thus the super-ugly hacky success check below.
> */
> - ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(feature),
> - HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
> - kfree(buf);
> - if (ret != -EIO && ret != sizeof(feature)) {
> + if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE ||
> + id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD) {
> + feature_size = sizeof(feature_mt);
> + feature = kmemdup(feature_mt, feature_size, GFP_KERNEL);
> + } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 */
> + if (id->vendor == BT_VENDOR_ID_APPLE) {
> + feature_size = sizeof(feature_mt_trackpad2_bt);
> + feature = kmemdup(feature_mt_trackpad2_bt,
> + feature_size, GFP_KERNEL);
> + } else { /* USB_VENDOR_ID_APPLE */
> + feature_size = sizeof(feature_mt_trackpad2_usb);
> + feature = kmemdup(feature_mt_trackpad2_usb,
> + feature_size, GFP_KERNEL);
> + }
> + }
> + if (!feature) {
> + ret = -ENOMEM;
> + goto err_stop_hw;
> + }
> + ret = hid_hw_raw_request(hdev, feature[0], feature, feature_size,
> + HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
> + kfree(feature);
> + if (ret != -EIO && ret != feature_size) {
> hid_err(hdev, "unable to request touch data (%d)\n", ret);
> goto err_stop_hw;
> }
> @@ -579,6 +688,10 @@ static const struct hid_device_id magic_mice[] = {
> USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
> { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
> USB_DEVICE_ID_APPLE_MAGICTRACKPAD), .driver_data = 0 },
> + { HID_BLUETOOTH_DEVICE(BT_VENDOR_ID_APPLE,
> + USB_DEVICE_ID_APPLE_MAGICTRACKPAD2), .driver_data = 0 },
> + { HID_USB_DEVICE(USB_VENDOR_ID_APPLE,
> + USB_DEVICE_ID_APPLE_MAGICTRACKPAD2), .driver_data = 0 },
> { }
> };
> MODULE_DEVICE_TABLE(hid, magic_mice);
> --
> 2.19.0.rc0.228.g281dcd1b4d0-goog
>

Cheers,
Benjamin

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