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Date: Wed, 20 Mar 2013 14:42:29 +0100
From: Benjamin Tissoires <benjamin.tissoires@...hat.com>
To: Henrik Rydberg <rydberg@...omail.se>
CC: Benjamin Tissoires <benjamin.tissoires@...il.com>,
Jiri Kosina <jkosina@...e.cz>,
Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] HID: multitouch: add handling for pen in dual-sensors
device
Hi Henrik,
On 03/19/2013 10:32 PM, Henrik Rydberg wrote:
> Hi Benjamin,
>
>> Dual sensors devices reports pen and touch on two different reports.
>> Using the quirk HID_QUIRK_MULTI_INPUT allows us to create a new input
>> device to forward pen events.
>>
>> The quirk HID_QUIRK_NO_EMPTY_INPUT avoids the creation of input devices
>> for the not used mouse emulation present on Win7 certified devices.
>>
>> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>> ---
>> drivers/hid/hid-multitouch.c | 55 ++++++++++++++++++++++++++++++++++++++++----
>> 1 file changed, 51 insertions(+), 4 deletions(-)
>
> I like the approach, it is indeed quite simple. Some comment below, though.
>
>>
>> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
>> index 315500c..77ba751 100644
>> --- a/drivers/hid/hid-multitouch.c
>> +++ b/drivers/hid/hid-multitouch.c
>> @@ -100,6 +100,7 @@ struct mt_device {
>> unsigned last_field_index; /* last field index of the report */
>> unsigned last_slot_field; /* the last field of a slot */
>> unsigned mt_report_id; /* the report ID of the multitouch device */
>> + unsigned pen_report_id; /* the report ID of the pen device */
>> __s8 inputmode; /* InputMode HID feature, -1 if non-existent */
>> __s8 inputmode_index; /* InputMode HID feature index in the report */
>> __s8 maxcontact_report_id; /* Maximum Contact Number HID feature,
>> @@ -365,6 +366,35 @@ static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
>> f->usages[f->length++] = usage->hid;
>> }
>>
>> +static int mt_pen_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> + struct hid_field *field, struct hid_usage *usage,
>> + unsigned long **bit, int *max)
>> +{
>> + struct mt_device *td = hid_get_drvdata(hdev);
>> +
>> + td->pen_report_id = field->report->id;
>> +
>> + return 0;
>> +}
>> +
>> +static int mt_pen_input_mapped(struct hid_device *hdev, struct hid_input *hi,
>> + struct hid_field *field, struct hid_usage *usage,
>> + unsigned long **bit, int *max)
>> +{
>> + return 0;
>> +}
>> +
>> +static int mt_pen_event(struct hid_device *hid, struct hid_field *field,
>> + struct hid_usage *usage, __s32 value)
>> +{
>> + /* let hid-input handle it */
>> + return 0;
>> +}
>> +
>> +static void mt_pen_report(struct hid_device *hid, struct hid_report *report)
>> +{
>> +}
>
> Should the next patch not go in here directly?
yes, possibly. Will squash them in v2.
>
>> +
>> static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>> struct hid_field *field, struct hid_usage *usage,
>> unsigned long **bit, int *max)
>> @@ -725,14 +755,12 @@ 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 &&
>> + field->application != HID_DG_PEN &&
>> field->application != HID_DG_TOUCHPAD)
>> return -1;
>>
>> - /* eGalax devices provide a Digitizer.Stylus input which overrides
>> - * the correct Digitizers.Finger X/Y ranges.
>> - * Let's just ignore this input. */
>> if (field->physical == HID_DG_STYLUS)
>> - return -1;
>> + return mt_pen_input_mapping(hdev, hi, field, usage, bit, max);
>>
>> return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
>> }
>> @@ -741,6 +769,9 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
>> struct hid_field *field, struct hid_usage *usage,
>> unsigned long **bit, int *max)
>> {
>> + if (field->physical == HID_DG_STYLUS)
>> + return mt_pen_input_mapped(hdev, hi, field, usage, bit, max);
>> +
>> return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
>> }
>>
>> @@ -752,6 +783,9 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
>> if (field->report->id == td->mt_report_id)
>> return mt_touch_event(hid, field, usage, value);
>>
>> + if (field->report->id == td->pen_report_id)
>> + return mt_pen_event(hid, field, usage, value);
>> +
>> /* ignore other reports */
>> return 1;
>> }
>> @@ -765,6 +799,9 @@ static void mt_report(struct hid_device *hid, struct hid_report *report)
>>
>> if (report->id == td->mt_report_id)
>> mt_touch_report(hid, report);
>> +
>> + if (report->id == td->pen_report_id)
>> + mt_pen_report(hid, report);
>> }
>>
>> static void mt_set_input_mode(struct hid_device *hdev)
>> @@ -887,6 +924,14 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>> */
>> hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
>>
>> + /*
>> + * This allows the driver to handle different input sensors
>> + * that emits events through different reports on the same HID
>> + * device.
>> + */
>> + hdev->quirks |= HID_QUIRK_MULTI_INPUT;
>> + hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
>
> I seem to recall problem with MULTI_INPUT on some devices. Should
> these not be turned on based on the device type?
IIRC, those problems appeared a long time ago, when hid-mt was not
handling properly the different collections. Now, the tests I conducted
show that all the device I know are properly handled this way.
Anyway, if you think it would be safer, we can add a quirk in the
mtclass and set the MULTI_INPUT quirk if requested.
Cheers,
Benjamin
>
>> +
>> td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
>> if (!td) {
>> dev_err(&hdev->dev, "cannot allocate multitouch data\n");
>> @@ -896,6 +941,8 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>> td->inputmode = -1;
>> td->maxcontact_report_id = -1;
>> td->cc_index = -1;
>> + td->mt_report_id = -1;
>> + td->pen_report_id = -1;
>> hid_set_drvdata(hdev, td);
>>
>> td->fields = kzalloc(sizeof(struct mt_fields), GFP_KERNEL);
>> --
>> 1.8.1.2
>>
>
> Thanks,
> Henrik
>
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