HID: detect Win 8 multitouch devices in core
Detecting Win 8 multitouch devices in core allows us to set quirks
before the device is parsed through hid_hw_start().
It also simplifies the detection of those devices in hid-multitouch and
makes the handling of those devices cleaner.
As Win 8 multitouch panels are in the group multitouch and rely on a
special feature to be detected, this patch adds a bitfield in the parser.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Tested-by: Srinivas Pandruvada<srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index ddd95f3..660dce9 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -685,6 +685,13 @@
hid->group = HID_GROUP_MULTITOUCH;
}
+static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage)
+{
+ if (usage == 0xff0000c5 && parser->global.report_count == 256 &&
+ parser->global.report_size == 8)
+ parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8;
+}
+
static void hid_scan_collection(struct hid_parser *parser, unsigned type)
{
struct hid_device *hid = parser->device;
@@ -714,6 +721,8 @@
case HID_MAIN_ITEM_TAG_OUTPUT:
break;
case HID_MAIN_ITEM_TAG_FEATURE:
+ for (i = 0; i < parser->local.usage_index; i++)
+ hid_scan_feature_usage(parser, parser->local.usage[i]);
break;
}
@@ -757,6 +766,13 @@
while ((start = fetch_item(start, end, &item)) != NULL)
dispatch_type[item.type](parser, &item);
+ /*
+ * Handle special flags set during scanning.
+ */
+ if ((parser->scan_flags & HID_SCAN_FLAG_MT_WIN_8) &&
+ (hid->group == HID_GROUP_MULTITOUCH))
+ hid->group = HID_GROUP_MULTITOUCH_WIN_8;
+
vfree(parser);
return 0;
}
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 0fe00e2..c28ef86 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -133,6 +133,7 @@
#define MT_CLS_NSMU 0x000a
#define MT_CLS_DUAL_CONTACT_NUMBER 0x0010
#define MT_CLS_DUAL_CONTACT_ID 0x0011
+#define MT_CLS_WIN_8 0x0012
/* vendor specific classes */
#define MT_CLS_3M 0x0101
@@ -205,6 +206,11 @@
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_SLOT_IS_CONTACTID,
.maxcontacts = 2 },
+ { .name = MT_CLS_WIN_8,
+ .quirks = MT_QUIRK_ALWAYS_VALID |
+ MT_QUIRK_IGNORE_DUPLICATES |
+ MT_QUIRK_HOVERING |
+ MT_QUIRK_CONTACT_CNT_ACCURATE },
/*
* vendor specific classes
@@ -332,19 +338,6 @@
td->maxcontacts = td->mtclass.maxcontacts;
break;
- case 0xff0000c5:
- if (field->report_count == 256 && field->report_size == 8) {
- /* Win 8 devices need special quirks */
- __s32 *quirks = &td->mtclass.quirks;
- *quirks |= MT_QUIRK_ALWAYS_VALID;
- *quirks |= MT_QUIRK_IGNORE_DUPLICATES;
- *quirks |= MT_QUIRK_HOVERING;
- *quirks |= MT_QUIRK_CONTACT_CNT_ACCURATE;
- *quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
- *quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
- *quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
- }
- break;
}
}
@@ -1346,6 +1339,11 @@
/* Generic MT device */
{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
+
+ /* Generic Win 8 certified MT device */
+ { .driver_data = MT_CLS_WIN_8,
+ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
+ HID_ANY_ID, HID_ANY_ID) },
{ }
};
MODULE_DEVICE_TABLE(hid, mt_devices);
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 0c48991..cef1e9b 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -295,6 +295,7 @@
#define HID_GROUP_GENERIC 0x0001
#define HID_GROUP_MULTITOUCH 0x0002
#define HID_GROUP_SENSOR_HUB 0x0003
+#define HID_GROUP_MULTITOUCH_WIN_8 0x0004
/*
* This is the global environment of the parser. This information is
@@ -532,6 +533,8 @@
#define HID_GLOBAL_STACK_SIZE 4
#define HID_COLLECTION_STACK_SIZE 4
+#define HID_SCAN_FLAG_MT_WIN_8 0x00000001
+
struct hid_parser {
struct hid_global global;
struct hid_global global_stack[HID_GLOBAL_STACK_SIZE];
@@ -540,6 +543,7 @@
unsigned collection_stack[HID_COLLECTION_STACK_SIZE];
unsigned collection_stack_ptr;
struct hid_device *device;
+ unsigned scan_flags;
};
struct hid_class_descriptor {