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alistair23-linux
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HID: multitouch: add support for trackpads 

* 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>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
Benjamin Tissoires 2012-02-04 17:08:48 +01:00 committed by Jiri Kosina
parent 7c7ed8ec33
commit c2ef8f21ea
1 changed files with 34 additions and 6 deletions
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40
drivers/hid/hid-multitouch.c
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@ -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 +404,19 @@ 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 = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
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;
@ -538,6 +563,9 @@ 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 */