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HID: do not init input reports for Win 8 multitouch devices

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Some multitouch screens do not like to be polled for input reports.
However, the Win8 spec says that all touches should be sent during
each report, making the initialization of reports unnecessary.
The Win7 spec is less precise, so do not use this for those devices.

Add the quirk HID_QUIRK_NO_INIT_INPUT_REPORTS so that we do not have to
introduce a quirk for each problematic device. This quirk makes the driver
behave the same way the Win 8 does. It actually retrieves the features,
but not the inputs.

Signed-off-by: Benjamin Tissoires <[email protected]>
Reviewed-by: Henrik Rydberg <[email protected]>
Tested-by: Srinivas Pandruvada<[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Benjamin Tissoires 2013-08-22 14:51:09 +02:00 • committed by Jiri Kosina
commit 595e9276ce
3 changed files with 21 additions and 3 deletions
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12
drivers/hid/hid-multitouch.c
View file

@ -951,6 +951,18 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
hdev->quirks |= HID_QUIRK_MULTI_INPUT;
hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
/*
* Handle special quirks for Windows 8 certified devices.
*/
if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
/*
* Some multitouch screens do not like to be polled for input
* reports. Fortunately, the Win8 spec says that all touches
* should be sent during each report, making the initialization
* of input reports unnecessary.
*/
hdev->quirks |= HID_QUIRK_NO_INIT_INPUT_REPORTS;
td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
if (!td) {
dev_err(&hdev->dev, "cannot allocate multitouch data\n");

11
drivers/hid/usbhid/hid-core.c
View file

@ -807,12 +807,17 @@ void usbhid_init_reports(struct hid_device *hid)
{
struct hid_report *report;
struct usbhid_device *usbhid = hid->driver_data;
struct hid_report_enum *report_enum;
int err, ret;
list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
usbhid_submit_report(hid, report, USB_DIR_IN);
if (!(hid->quirks & HID_QUIRK_NO_INIT_INPUT_REPORTS)) {
report_enum = &hid->report_enum[HID_INPUT_REPORT];
list_for_each_entry(report, &report_enum->report_list, list)
usbhid_submit_report(hid, report, USB_DIR_IN);
}
list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
report_enum = &hid->report_enum[HID_FEATURE_REPORT];
list_for_each_entry(report, &report_enum->report_list, list)
usbhid_submit_report(hid, report, USB_DIR_IN);
err = 0;