Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-15 00:21:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

HID: multitouch: do not retrieve all reports for all devices

Browse Source 
We already have in place a quirk for Windows 8 devices, but it looks
like the Surface Cover are not conforming to it.
Given that we are only interested in 3 feature reports (the ones that
the Windows driver retrieves), we should be safe to unconditionally apply
the quirk to everybody.

In case there is an issue with a controller, we can always mark it as such
in the transport driver, and hid-multitouch won't try to retrieve the
feature report.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2016-11-25 14:27:22 +01:00 committed by Jiri Kosina
parent 8fe89ef076
commit b897f6db3a
1 changed files with 40 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
drivers/hid/hid-multitouch.c
View File

@ -108,6 +108,7 @@ struct mt_device {
int cc_value_index; /* contact count value index in the field */
unsigned last_slot_field; /* the last field of a slot */
unsigned mt_report_id; /* the report ID of the multitouch device */
unsigned long initial_quirks; /* initial quirks state */
__s16 inputmode; /* InputMode HID feature, -1 if non-existent */
__s16 inputmode_index; /* InputMode HID feature index in the report */
__s16 maxcontact_report_id; /* Maximum Contact Number HID feature,
@ -318,13 +319,10 @@ static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
u8 *buf;
/*
* Only fetch the feature report if initial reports are not already
* been retrieved. Currently this is only done for Windows 8 touch
* devices.
* Do not fetch the feature report if the device has been explicitly
* marked as non-capable.
*/
if (!(hdev->quirks & HID_QUIRK_NO_INIT_REPORTS))
return;
if (td->mtclass.name != MT_CLS_WIN_8)
if (td->initial_quirks & HID_QUIRK_NO_INIT_REPORTS)
return;
buf = hid_alloc_report_buf(report, GFP_KERNEL);
@ -1085,36 +1083,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
}
}
/* This allows the driver to correctly support devices
* that emit events over several HID messages.
*/
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;
/*
* 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.
*
* In addition some touchpads do not behave well if we read
* all feature reports from them. Instead we prevent
* initial report fetching and then selectively fetch each
* report we are interested in.
*/
hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
if (!td) {
dev_err(&hdev->dev, "cannot allocate multitouch data\n");
@ -1138,6 +1106,39 @@ 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)
td->serial_maybe = true;
/*
* Store the initial quirk state
*/
td->initial_quirks = hdev->quirks;
/* This allows the driver to correctly support devices
* that emit events over several HID messages.
*/
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;
/*
* 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. For Win7 devices, well, let's hope
* they will still be happy (this is only be a problem if a touch
* was already there while probing the device).
*
* In addition some touchpads do not behave well if we read
* all feature reports from them. Instead we prevent
* initial report fetching and then selectively fetch each
* report we are interested in.
*/
hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
ret = hid_parse(hdev);
if (ret != 0)
return ret;
@ -1206,8 +1207,11 @@ static int mt_resume(struct hid_device *hdev)
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);
hdev->quirks = td->initial_quirks;
}
/*