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Subject[PATCH 1/2] hid-multitouch: add support for trackpads
Date
From: Benjamin Tissoires <benjamin.tissoires@gmail.com>

* some multitouch trackpads present the touch usage. This needs to be
filtered as it will conflict with mt-implementation.
* trackpads send BTN_TOOL_* to notify how many fingers are present
(this is used by xorg to use synaptics instead of generic evdev)
* trackpads like Perixx 701 are not different from a hid point of view
from a touchscreen, and we need to manually set them as touchpad.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
---
drivers/hid/hid-multitouch.c | 44 ++++++++++++++++++++++++++++++++++++-----
1 files changed, 38 insertions(+), 6 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 24fc442..1ba60d3 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1,9 +1,9 @@
/*
* HID driver for multitouch panels
*
- * Copyright (c) 2010-2011 Stephane Chatty <chatty@enac.fr>
- * Copyright (c) 2010-2011 Benjamin Tissoires <benjamin.tissoires@gmail.com>
- * Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France
+ * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
+ * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
*
* This code is partly based on hid-egalax.c:
*
@@ -67,6 +67,7 @@ struct mt_class {
__s32 sn_height; /* Signal/noise ratio for height events */
__s32 sn_pressure; /* Signal/noise ratio for pressure events */
__u8 maxcontacts;
+ bool is_indirect; /* true for touchpads */
};

struct mt_device {
@@ -265,17 +266,31 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
{
struct mt_device *td = hid_get_drvdata(hdev);
struct mt_class *cls = &td->mtclass;
+ int code;

/* Only map fields from TouchScreen or TouchPad collections.
* We need to ignore fields that belong to other collections
* such as Mouse that might have the same GenericDesktop usages. */
if (field->application == HID_DG_TOUCHSCREEN)
set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
- else if (field->application == HID_DG_TOUCHPAD)
- set_bit(INPUT_PROP_POINTER, hi->input->propbit);
- else
+ else if (field->application != HID_DG_TOUCHPAD)
return 0;

+ /* In case of an indirect device (touchpad), we need to add
+ * specific BTN_TOOL_* to be handled by the synaptics xorg
+ * driver.
+ * We also consider that touchscreens providing buttons are touchpads.
+ */
+ if (field->application == HID_DG_TOUCHPAD ||
+ (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON ||
+ cls->is_indirect) {
+ set_bit(INPUT_PROP_POINTER, hi->input->propbit);
+ set_bit(BTN_TOOL_FINGER, hi->input->keybit);
+ set_bit(BTN_TOOL_DOUBLETAP, hi->input->keybit);
+ set_bit(BTN_TOOL_TRIPLETAP, hi->input->keybit);
+ set_bit(BTN_TOOL_QUADTAP, hi->input->keybit);
+ }
+
/* eGalax devices provide a Digitizer.Stylus input which overrides
* the correct Digitizers.Finger X/Y ranges.
* Let's just ignore this input. */
@@ -389,9 +404,20 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
td->last_field_index = field->index;
return -1;
}
+ case HID_DG_TOUCH:
+ /* Legacy devices use TIPSWITCH and not TOUCH.
+ * Let's just ignore this field. */
+ return -1;
/* let hid-input decide for the others */
return 0;

+ case HID_UP_BUTTON:
+ code = ((usage->hid - 1) & HID_USAGE);
+ code += BTN_MOUSE;
+ hid_map_usage(hi, usage, bit, max, EV_KEY, code);
+ input_set_capability(hi->input, EV_KEY, code);
+ return 1;
+
case 0xff000000:
/* we do not want to map these: no input-oriented meaning */
return -1;
@@ -453,6 +479,7 @@ static void mt_complete_slot(struct mt_device *td)
static void mt_emit_event(struct mt_device *td, struct input_dev *input)
{
int i;
+ int finger_count = 0;

for (i = 0; i < td->maxcontacts; ++i) {
struct mt_slot *s = &(td->slots[i]);
@@ -477,12 +504,14 @@ static void mt_emit_event(struct mt_device *td, struct input_dev *input)
input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
+ finger_count++;
}
s->seen_in_this_frame = false;

}

input_mt_report_pointer_emulation(input, true);
+ input_mt_report_finger_count(input, finger_count);
input_sync(input);
td->num_received = 0;
}
@@ -538,6 +567,9 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
if (value)
td->num_expected = value;
break;
+ case HID_DG_TOUCH:
+ /* do nothing */
+ break;

default:
/* fallback to the generic hidinput handling */
--
1.7.4.4


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