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Message-Id: <1341346951-10974-1-git-send-email-miletus@chromium.org>
Date: Tue, 3 Jul 2012 16:22:31 -0400
From: Yufeng Shen <miletus@...omium.org>
To: linux-input@...r.kernel.org
Cc: Jiri Kosina <jkosina@...e.cz>,
Henrik Rydberg <rydberg@...omail.se>,
linux-kernel@...r.kernel.org, Daniel Kurtz <djkurtz@...omium.org>,
Andrew de los Reyes <adlr@...omium.org>,
Chase Douglas <chase.douglas@...onical.com>,
Yufeng Shen <miletus@...omium.org>
Subject: [PATCH 2/2 v3] HID: magicmouse: Implement Multi-touch Protocol B (MT-B)
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.
V3: Removed the single touch related logic.
V2: Converting entirely to MT-B as Henrik Rydberg suggested.
Change-Id: I7eab3cd06f761e0e76f07540dcd38aa7ad7a048b
Signed-off-by: Yufeng Shen <miletus@...omium.org>
---
drivers/hid/hid-magicmouse.c | 65 ++++++++++++++---------------------------
1 files changed, 22 insertions(+), 43 deletions(-)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index fd88f21..82836e1 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -16,6 +16,7 @@
#include <linux/device.h>
#include <linux/hid.h>
+#include <linux/input/mt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
@@ -68,15 +69,6 @@ MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state fie
#define SCROLL_ACCEL_DEFAULT 7
-/* Single touch emulation should only begin when no touches are currently down.
- * This is true when single_touch_id is equal to NO_TOUCHES. If multiple touches
- * are down and the touch providing for single touch emulation is lifted,
- * single_touch_id is equal to SINGLE_TOUCH_UP. While single touch emulation is
- * occurring, single_touch_id corresponds with the tracking id of the touch used.
- */
-#define NO_TOUCHES -1
-#define SINGLE_TOUCH_UP -2
-
/* Touch surface information. Dimension is in hundredths of a mm, min and max
* are in units. */
#define MOUSE_DIMENSION_X (float)9056
@@ -125,7 +117,6 @@ struct magicmouse_sc {
u8 size;
} touches[16];
int tracking_ids[16];
- int single_touch_id;
};
static int magicmouse_firm_touch(struct magicmouse_sc *msc)
@@ -264,16 +255,14 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
}
}
- if (down) {
+ if (down)
msc->ntouches++;
- if (msc->single_touch_id == NO_TOUCHES)
- msc->single_touch_id = id;
- } else if (msc->single_touch_id == id)
- msc->single_touch_id = SINGLE_TOUCH_UP;
+
+ input_mt_slot(input, id);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, down);
/* Generate the input events for this touch. */
if (down) {
- input_report_abs(input, ABS_MT_TRACKING_ID, id);
input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
input_report_abs(input, ABS_MT_ORIENTATION, -orientation);
@@ -286,8 +275,6 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
input_event(input, EV_MSC, MSC_RAW, tdata[8]);
}
-
- input_mt_sync(input);
}
}
@@ -308,12 +295,6 @@ static int magicmouse_raw_event(struct hid_device *hdev,
for (ii = 0; ii < npoints; ii++)
magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
- /* We don't need an MT sync here because trackpad emits a
- * BTN_TOUCH event in a new frame when all touches are released.
- */
- if (msc->ntouches == 0)
- msc->single_touch_id = NO_TOUCHES;
-
clicks = data[1];
/* The following bits provide a device specific timestamp. They
@@ -331,9 +312,6 @@ static int magicmouse_raw_event(struct hid_device *hdev,
for (ii = 0; ii < npoints; ii++)
magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
- if (msc->ntouches == 0)
- input_mt_sync(input);
-
/* When emulating three-button mode, it is important
* to have the current touch information before
* generating a click event.
@@ -367,24 +345,17 @@ static int magicmouse_raw_event(struct hid_device *hdev,
} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
input_report_key(input, BTN_MOUSE, clicks & 1);
input_report_key(input, BTN_TOUCH, msc->ntouches > 0);
- input_report_key(input, BTN_TOOL_FINGER, msc->ntouches == 1);
- input_report_key(input, BTN_TOOL_DOUBLETAP, msc->ntouches == 2);
- input_report_key(input, BTN_TOOL_TRIPLETAP, msc->ntouches == 3);
- input_report_key(input, BTN_TOOL_QUADTAP, msc->ntouches == 4);
- if (msc->single_touch_id >= 0) {
- input_report_abs(input, ABS_X,
- msc->touches[msc->single_touch_id].x);
- input_report_abs(input, ABS_Y,
- msc->touches[msc->single_touch_id].y);
- }
+ input_mt_report_pointer_emulation(input, true);
}
input_sync(input);
return 1;
}
-static void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
+static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
{
+ int error;
+
__set_bit(EV_KEY, input->evbit);
if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
@@ -413,6 +384,7 @@ static void magicmouse_setup_input(struct input_dev *input, struct hid_device *h
__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
__set_bit(BTN_TOOL_QUADTAP, input->keybit);
+ __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
__set_bit(BTN_TOUCH, input->keybit);
__set_bit(INPUT_PROP_POINTER, input->propbit);
__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
@@ -421,7 +393,9 @@ static void magicmouse_setup_input(struct input_dev *input, struct hid_device *h
__set_bit(EV_ABS, input->evbit);
- input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 15, 0, 0);
+ error = input_mt_init_slots(input, 16);
+ 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,
@@ -468,6 +442,8 @@ static void magicmouse_setup_input(struct input_dev *input, struct hid_device *h
__set_bit(EV_MSC, input->evbit);
__set_bit(MSC_RAW, input->mscbit);
}
+
+ return 0;
}
static int magicmouse_input_mapping(struct hid_device *hdev,
@@ -506,8 +482,6 @@ static int magicmouse_probe(struct hid_device *hdev,
msc->quirks = id->driver_data;
hid_set_drvdata(hdev, msc);
- msc->single_touch_id = NO_TOUCHES;
-
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "magicmouse hid parse failed\n");
@@ -523,8 +497,13 @@ static int magicmouse_probe(struct hid_device *hdev,
/* 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 (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,
--
1.7.7.3
--
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