[PATCH v2 2/3] HID: detect Win 8 multitouch devices in core
From: Benjamin Tissoires
Date: Wed Aug 21 2013 - 11:40:47 EST
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 also temporary convert
hid->group into a bitfield, before reverting it to the actual
group information. If we ever have more than 16 groups to detect,
we can then add a .flags field in hid_parser for instance, and then
use this to get the actual group.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
changes in v2:
- moved "flags" processing here
- do not introduce parser->flags, but use hid->group as a temporary flag placeholder
- #define and #undef HID_FLAG_* in hid-core.c instead of hid.h
- amended commit message
drivers/hid/hid-core.c | 41 +++++++++++++++++++++++++++++++++++++++--
drivers/hid/hid-multitouch.c | 24 +++++++++++-------------
include/linux/hid.h | 1 +
3 files changed, 51 insertions(+), 15 deletions(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index e072b15..c749966 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -677,12 +677,25 @@ static u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item)
return NULL;
}
+#define HID_FLAG_MULTITOUCH (1 << HID_GROUP_MULTITOUCH)
+#define HID_FLAG_WIN_8_CERTIFIED (1 << HID_GROUP_MULTITOUCH_WIN_8)
+#define HID_FLAG_SENSOR_HUB (1 << HID_GROUP_SENSOR_HUB)
+
static void hid_scan_input_usage(struct hid_parser *parser, u32 usage)
{
struct hid_device *hid = parser->device;
if (usage == HID_DG_CONTACTID)
- hid->group = HID_GROUP_MULTITOUCH;
+ hid->group |= HID_FLAG_MULTITOUCH;
+}
+
+static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage)
+{
+ struct hid_device *hid = parser->device;
+
+ if (usage == 0xff0000c5 && parser->global.report_count == 256 &&
+ parser->global.report_size == 8)
+ hid->group |= HID_FLAG_WIN_8_CERTIFIED;
}
static void hid_scan_collection(struct hid_parser *parser, unsigned type)
@@ -691,7 +704,7 @@ static void hid_scan_collection(struct hid_parser *parser, unsigned type)
if (((parser->global.usage_page << 16) == HID_UP_SENSOR) &&
type == HID_COLLECTION_PHYSICAL)
- hid->group = HID_GROUP_SENSOR_HUB;
+ hid->group |= HID_FLAG_SENSOR_HUB;
}
static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
@@ -714,6 +727,8 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
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;
default:
hid_err(parser->device, "unknown main item tag 0x%x\n",
@@ -759,10 +774,32 @@ static int hid_scan_report(struct hid_device *hid)
while ((start = fetch_item(start, end, &item)) != NULL)
dispatch_type[item.type](parser, &item);
+ /*
+ * Re-interprete the group field to keep the same group definitions than
+ * we had in previous kernels.
+ */
+ switch (hid->group) {
+ case HID_FLAG_MULTITOUCH:
+ hid->group = HID_GROUP_MULTITOUCH;
+ break;
+ case HID_FLAG_MULTITOUCH | HID_FLAG_WIN_8_CERTIFIED:
+ hid->group = HID_GROUP_MULTITOUCH_WIN_8;
+ break;
+ case HID_FLAG_SENSOR_HUB:
+ hid->group = HID_GROUP_SENSOR_HUB;
+ break;
+ default:
+ hid->group = HID_GROUP_GENERIC;
+ }
+
vfree(parser);
return 0;
}
+#undef HID_FLAG_MULTITOUCH
+#undef HID_FLAG_WIN_8_CERTIFIED
+#undef HID_FLAG_SENSOR_HUB
+
/**
* hid_parse_report - parse device report
*
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 @@ static void mt_post_parse(struct mt_device *td);
#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 @@ static struct mt_class mt_classes[] = {
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 @@ static void mt_feature_mapping(struct hid_device *hdev,
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 @@ static const struct hid_device_id mt_devices[] = {
/* 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 5a4e789..45b7f3f 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -295,6 +295,7 @@ struct hid_item {
#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
--
1.8.3.1
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