Commit f961bd35 authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina
Browse files

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: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: default avatarHenrik Rydberg <rydberg@euromail.se>
Tested-by: default avatarSrinivas <Pandruvada&lt;srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 3dc8fc08

drivers/hid/hid-core.c

+16 −0
Original line number Diff line number Diff line
@@ -685,6 +685,13 @@ static void hid_scan_input_usage(struct hid_parser *parser, u32 usage) 
		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 @@ 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;

	}
@@ -757,6 +766,13 @@ static int hid_scan_report(struct hid_device *hid) 
	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;

}

drivers/hid/hid-multitouch.c

+11 −13
Original line number Diff line number Diff line
@@ -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);

include/linux/hid.h

+4 −0
Original line number Diff line number Diff line
@@ -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
@@ -532,6 +533,8 @@ static inline void hid_set_drvdata(struct hid_device *hdev, void *data) 
#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 @@ struct hid_parser { 
	unsigned              collection_stack[HID_COLLECTION_STACK_SIZE];

	unsigned              collection_stack_ptr;

	struct hid_device    *device;

	unsigned              scan_flags;

};



struct hid_class_descriptor {

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