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Date: Wed, 29 Aug 2012 15:36:40 +0200
From: Benjamin Tissoires <benjamin.tissoires@...c.fr>
To: Jiri Kosina <jkosina@...e.cz>
Cc: Henrik Rydberg <rydberg@...omail.se>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: multitouch: Remove the redundant touch state
Hi Jiri,
On Wed, Aug 29, 2012 at 12:25 AM, Jiri Kosina <jkosina@...e.cz> wrote:
> On Wed, 22 Aug 2012, Henrik Rydberg wrote:
>
>> With the input_mt_sync_frame() function in place, there is no longer
>> any need to keep the full touch state in the driver. This patch
>> removes the slot state and replaces the lookup code with the input-mt
>> equivalent. The initialization code is moved to mt_input_configured(),
>> to make sure the full HID report has been seen.
>>
>> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
>> ---
>> Hi Benjamin,
>>
>> Maybe this patch works better? It has received limited testing so far.
>
> What is the status of this patch please? Henrik, Benjamin?
Well, Henrik submitted a new release a few days ago (including this version).
I just didn't found the time to test the whole thing on our different devices.
It's now on the top of my TODO list.
Cheers,
Benjamin
>
>>
>> Henrik
>>
>> drivers/hid/hid-multitouch.c | 133 +++++++++++++++----------------------------
>> 1 file changed, 46 insertions(+), 87 deletions(-)
>>
>> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
>> index c400d90..dc08a4e 100644
>> --- a/drivers/hid/hid-multitouch.c
>> +++ b/drivers/hid/hid-multitouch.c
>> @@ -56,7 +56,6 @@ struct mt_slot {
>> __s32 x, y, p, w, h;
>> __s32 contactid; /* the device ContactID assigned to this slot */
>> bool touch_state; /* is the touch valid? */
>> - bool seen_in_this_frame;/* has this slot been updated */
>> };
>>
>> struct mt_class {
>> @@ -93,7 +92,7 @@ struct mt_device {
>> * 1 means we should use a serial protocol
>> * > 1 means hybrid (multitouch) protocol */
>> bool curvalid; /* is the current contact valid? */
>> - struct mt_slot *slots;
>> + unsigned mt_flags; /* flags to pass to input-mt */
>> };
>>
>> /* classes of device behavior */
>> @@ -134,25 +133,6 @@ static int cypress_compute_slot(struct mt_device *td)
>> return -1;
>> }
>>
>> -static int find_slot_from_contactid(struct mt_device *td)
>> -{
>> - int i;
>> - for (i = 0; i < td->maxcontacts; ++i) {
>> - if (td->slots[i].contactid == td->curdata.contactid &&
>> - td->slots[i].touch_state)
>> - return i;
>> - }
>> - for (i = 0; i < td->maxcontacts; ++i) {
>> - if (!td->slots[i].seen_in_this_frame &&
>> - !td->slots[i].touch_state)
>> - return i;
>> - }
>> - /* should not occurs. If this happens that means
>> - * that the device sent more touches that it says
>> - * in the report descriptor. It is ignored then. */
>> - return -1;
>> -}
>> -
>> static struct mt_class mt_classes[] = {
>> { .name = MT_CLS_DEFAULT,
>> .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
>> @@ -319,24 +299,16 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> * 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);
>> + td->mt_flags |= INPUT_MT_DIRECT;
>> 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.
>> + /*
>> + * Model touchscreens providing buttons as 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);
>> - }
>> + (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
>> + td->mt_flags |= INPUT_MT_POINTER;
>>
>> /* eGalax devices provide a Digitizer.Stylus input which overrides
>> * the correct Digitizers.Finger X/Y ranges.
>> @@ -353,8 +325,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> EV_ABS, ABS_MT_POSITION_X);
>> set_abs(hi->input, ABS_MT_POSITION_X, field,
>> cls->sn_move);
>> - /* touchscreen emulation */
>> - set_abs(hi->input, ABS_X, field, cls->sn_move);
>> mt_store_field(usage, td, hi);
>> td->last_field_index = field->index;
>> return 1;
>> @@ -363,8 +333,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> EV_ABS, ABS_MT_POSITION_Y);
>> set_abs(hi->input, ABS_MT_POSITION_Y, field,
>> cls->sn_move);
>> - /* touchscreen emulation */
>> - set_abs(hi->input, ABS_Y, field, cls->sn_move);
>> mt_store_field(usage, td, hi);
>> td->last_field_index = field->index;
>> return 1;
>> @@ -390,7 +358,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> case HID_DG_CONTACTID:
>> if (!td->maxcontacts)
>> td->maxcontacts = MT_DEFAULT_MAXCONTACT;
>> - input_mt_init_slots(hi->input, td->maxcontacts, 0);
>> mt_store_field(usage, td, hi);
>> td->last_field_index = field->index;
>> td->touches_by_report++;
>> @@ -418,9 +385,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> EV_ABS, ABS_MT_PRESSURE);
>> set_abs(hi->input, ABS_MT_PRESSURE, field,
>> cls->sn_pressure);
>> - /* touchscreen emulation */
>> - set_abs(hi->input, ABS_PRESSURE, field,
>> - cls->sn_pressure);
>> mt_store_field(usage, td, hi);
>> td->last_field_index = field->index;
>> return 1;
>> @@ -464,7 +428,24 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
>> return -1;
>> }
>>
>> -static int mt_compute_slot(struct mt_device *td)
>> +static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
>> +
>> +{
>> + struct mt_device *td = hid_get_drvdata(hdev);
>> + struct mt_class *cls = &td->mtclass;
>> +
>> + if (cls->is_indirect)
>> + td->mt_flags |= INPUT_MT_POINTER;
>> +
>> + if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
>> + td->mt_flags |= INPUT_MT_DROP_UNUSED;
>> +
>> + input_mt_init_slots(hi->input, td->maxcontacts, td->mt_flags);
>> +
>> + td->mt_flags = 0;
>> +}
>> +
>> +static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
>> {
>> __s32 quirks = td->mtclass.quirks;
>>
>> @@ -480,42 +461,23 @@ static int mt_compute_slot(struct mt_device *td)
>> if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
>> return td->curdata.contactid - 1;
>>
>> - return find_slot_from_contactid(td);
>> + return input_mt_assign_slot_by_id(input, td->curdata.contactid);
>> }
>>
>> /*
>> * this function is called when a whole contact has been processed,
>> * so that it can assign it to a slot and store the data there
>> */
>> -static void mt_complete_slot(struct mt_device *td)
>> +static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
>> {
>> - td->curdata.seen_in_this_frame = true;
>> if (td->curvalid) {
>> - int slotnum = mt_compute_slot(td);
>> -
>> - if (slotnum >= 0 && slotnum < td->maxcontacts)
>> - td->slots[slotnum] = td->curdata;
>> - }
>> - td->num_received++;
>> -}
>> + int slotnum = mt_compute_slot(td, input);
>> + struct mt_slot *s = &td->curdata;
>>
>> + if (slotnum < 0 || slotnum >= td->maxcontacts)
>> + return;
>>
>> -/*
>> - * this function is called when a whole packet has been received and processed,
>> - * so that it can decide what to send to the input layer.
>> - */
>> -static void mt_emit_event(struct mt_device *td, struct input_dev *input)
>> -{
>> - int i;
>> -
>> - for (i = 0; i < td->maxcontacts; ++i) {
>> - struct mt_slot *s = &(td->slots[i]);
>> - if ((td->mtclass.quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
>> - !s->seen_in_this_frame) {
>> - s->touch_state = false;
>> - }
>> -
>> - input_mt_slot(input, i);
>> + input_mt_slot(input, slotnum);
>> input_mt_report_slot_state(input, MT_TOOL_FINGER,
>> s->touch_state);
>> if (s->touch_state) {
>> @@ -532,16 +494,22 @@ static void mt_emit_event(struct mt_device *td, struct input_dev *input)
>> input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
>> input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
>> }
>> - s->seen_in_this_frame = false;
>> -
>> }
>>
>> - input_mt_report_pointer_emulation(input, true);
>> - input_sync(input);
>> - td->num_received = 0;
>> + td->num_received++;
>> }
>>
>>
>> +/*
>> + * this function is called when a whole packet has been received and processed,
>> + * so that it can decide what to send to the input layer.
>> + */
>> +static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
>> +{
>> + input_mt_sync_frame(input);
>> + input_sync(input);
>> + td->num_received = 0;
>> +}
>>
>> static int mt_event(struct hid_device *hid, struct hid_field *field,
>> struct hid_usage *usage, __s32 value)
>> @@ -549,7 +517,7 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
>> struct mt_device *td = hid_get_drvdata(hid);
>> __s32 quirks = td->mtclass.quirks;
>>
>> - if (hid->claimed & HID_CLAIMED_INPUT && td->slots) {
>> + if (hid->claimed & HID_CLAIMED_INPUT) {
>> switch (usage->hid) {
>> case HID_DG_INRANGE:
>> if (quirks & MT_QUIRK_ALWAYS_VALID)
>> @@ -602,11 +570,11 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
>> }
>>
>> if (usage->hid == td->last_slot_field)
>> - mt_complete_slot(td);
>> + mt_complete_slot(td, field->hidinput->input);
>>
>> if (field->index == td->last_field_index
>> && td->num_received >= td->num_expected)
>> - mt_emit_event(td, field->hidinput->input);
>> + mt_sync_frame(td, field->hidinput->input);
>>
>> }
>>
>> @@ -735,15 +703,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>> if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
>> mt_post_parse_default_settings(td);
>>
>> - td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
>> - GFP_KERNEL);
>> - if (!td->slots) {
>> - dev_err(&hdev->dev, "cannot allocate multitouch slots\n");
>> - hid_hw_stop(hdev);
>> - ret = -ENOMEM;
>> - goto fail;
>> - }
>> -
>> ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
>>
>> mt_set_maxcontacts(hdev);
>> @@ -774,7 +733,6 @@ static void mt_remove(struct hid_device *hdev)
>> struct mt_device *td = hid_get_drvdata(hdev);
>> sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
>> hid_hw_stop(hdev);
>> - kfree(td->slots);
>> kfree(td);
>> hid_set_drvdata(hdev, NULL);
>> }
>> @@ -1087,6 +1045,7 @@ static struct hid_driver mt_driver = {
>> .remove = mt_remove,
>> .input_mapping = mt_input_mapping,
>> .input_mapped = mt_input_mapped,
>> + .input_configured = mt_input_configured,
>> .feature_mapping = mt_feature_mapping,
>> .usage_table = mt_grabbed_usages,
>> .event = mt_event,
>> --
>> 1.7.11.5
>>
>
> --
> Jiri Kosina
> SUSE Labs
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