From c2ef8f21ea8f7c34dfa0b569fdee431348205955 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Sat, 4 Feb 2012 17:08:48 +0100 Subject: [PATCH] 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 Acked-by: Henrik Rydberg Signed-off-by: Jiri Kosina --- drivers/hid/hid-multitouch.c | 40 ++++++++++++++++++++++++++++++------ 1 file changed, 34 insertions(+), 6 deletions(-) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 24fc4423b93..4c697498fcf 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 - * Copyright (c) 2010-2011 Benjamin Tissoires - * Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France + * Copyright (c) 2010-2012 Stephane Chatty + * Copyright (c) 2010-2012 Benjamin Tissoires + * 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 */