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

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>

drivers/hid/hid-multitouch.c

@@ -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);
@@ -1085,6 +1083,34 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		}
 	}
 
+	td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
+	if (!td) {
+		dev_err(&hdev->dev, "cannot allocate multitouch data\n");
+		return -ENOMEM;
+	}
+	td->mtclass = *mtclass;
+	td->inputmode = -1;
+	td->maxcontact_report_id = -1;
+	td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
+	td->cc_index = -1;
+	td->mt_report_id = -1;
+	hid_set_drvdata(hdev, td);
+
+	td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
+				  GFP_KERNEL);
+	if (!td->fields) {
+		dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
+		return -ENOMEM;
+	}
+
+	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.
 	 */
@@ -1098,15 +1124,13 @@ 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.
+	 * 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
@@ -1115,29 +1139,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	 */
 	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");
-		return -ENOMEM;
-	}
-	td->mtclass = *mtclass;
-	td->inputmode = -1;
-	td->maxcontact_report_id = -1;
-	td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
-	td->cc_index = -1;
-	td->mt_report_id = -1;
-	hid_set_drvdata(hdev, td);
-
-	td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
-				  GFP_KERNEL);
-	if (!td->fields) {
-		dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
-		return -ENOMEM;
-	}
-
-	if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
-		td->serial_maybe = true;
-
 	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;
 }
 
 /*