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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2017-01-30 12:48:06 +0300
committerJiri Kosina <jkosina@suse.cz>2017-02-03 16:45:57 +0300
commitf3287a995ac3520b1afcf03932b9c405f502657c (patch)
treeb54c9641b4d2a6be1d7b8ad6bec8c9db2a245855 /drivers/hid
parent8e9faa15469ed7c7467423db4c62aeed3ff4cae3 (diff)
downloadlinux-f3287a995ac3520b1afcf03932b9c405f502657c.tar.xz
HID: multitouch: fix LG Melfas touchscreen
The LG Melfas touchscreen has a bad firmware where it declares the Contact ID field as constant while it shouldn't. This messes up the autodetection and the reporting of the events by hid-multitouch given that hid-input ignores constant fields. The autodetection is simply worked around by manually adding the device to hid_have_special_driver[]. The processing of the events requires either a report fixup, or some specific case handling. Given that the report fixup would require to basically rewrite all the report descriptor, I went for the programatic way of fixing that after the report descriptors are loaded. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1416181 Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-core.c1
-rw-r--r--drivers/hid/hid-ids.h1
-rw-r--r--drivers/hid/hid-multitouch.c44
3 files changed, 46 insertions, 0 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index ea36b557d5ee..1f6d0c000381 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1933,6 +1933,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_CBTKBD) },
{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPPRODOCK) },
#endif
+ { HID_USB_DEVICE(USB_VENDOR_ID_LG, USB_DEVICE_ID_LG_MELFAS_MT) },
{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER_2) },
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 350accfee8e8..8943a58c626d 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -633,6 +633,7 @@
#define USB_VENDOR_ID_LG 0x1fd2
#define USB_DEVICE_ID_LG_MULTITOUCH 0x0064
+#define USB_DEVICE_ID_LG_MELFAS_MT 0x6007
#define USB_VENDOR_ID_LOGITECH 0x046d
#define USB_DEVICE_ID_LOGITECH_AUDIOHUB 0x0a0e
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6dca66806844..692647485a53 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -68,6 +68,7 @@ MODULE_LICENSE("GPL");
#define MT_QUIRK_HOVERING (1 << 11)
#define MT_QUIRK_CONTACT_CNT_ACCURATE (1 << 12)
#define MT_QUIRK_FORCE_GET_FEATURE (1 << 13)
+#define MT_QUIRK_FIX_CONST_CONTACT_ID (1 << 14)
#define MT_INPUTMODE_TOUCHSCREEN 0x02
#define MT_INPUTMODE_TOUCHPAD 0x03
@@ -157,6 +158,7 @@ static void mt_post_parse(struct mt_device *td);
#define MT_CLS_FLATFROG 0x0107
#define MT_CLS_GENERALTOUCH_TWOFINGERS 0x0108
#define MT_CLS_GENERALTOUCH_PWT_TENFINGERS 0x0109
+#define MT_CLS_LG 0x010a
#define MT_CLS_VTL 0x0110
#define MT_DEFAULT_MAXCONTACT 10
@@ -263,6 +265,12 @@ static struct mt_class mt_classes[] = {
.sn_move = 2048,
.maxcontacts = 40,
},
+ { .name = MT_CLS_LG,
+ .quirks = MT_QUIRK_ALWAYS_VALID |
+ MT_QUIRK_FIX_CONST_CONTACT_ID |
+ MT_QUIRK_IGNORE_DUPLICATES |
+ MT_QUIRK_HOVERING |
+ MT_QUIRK_CONTACT_CNT_ACCURATE },
{ .name = MT_CLS_VTL,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_CONTACT_CNT_ACCURATE |
@@ -1078,6 +1086,34 @@ static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
return 0;
}
+static void mt_fix_const_field(struct hid_field *field, unsigned int usage)
+{
+ if (field->usage[0].hid != usage ||
+ !(field->flags & HID_MAIN_ITEM_CONSTANT))
+ return;
+
+ field->flags &= ~HID_MAIN_ITEM_CONSTANT;
+ field->flags |= HID_MAIN_ITEM_VARIABLE;
+}
+
+static void mt_fix_const_fields(struct hid_device *hdev, unsigned int usage)
+{
+ struct hid_report *report;
+ int i;
+
+ list_for_each_entry(report,
+ &hdev->report_enum[HID_INPUT_REPORT].report_list,
+ list) {
+
+ if (!report->maxfield)
+ continue;
+
+ for (i = 0; i < report->maxfield; i++)
+ if (report->field[i]->maxusage >= 1)
+ mt_fix_const_field(report->field[i], usage);
+ }
+}
+
static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret, i;
@@ -1151,6 +1187,9 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (ret != 0)
return ret;
+ if (mtclass->quirks & MT_QUIRK_FIX_CONST_CONTACT_ID)
+ mt_fix_const_fields(hdev, HID_DG_CONTACTID);
+
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret)
return ret;
@@ -1398,6 +1437,11 @@ static const struct hid_device_id mt_devices[] = {
MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
USB_DEVICE_ID_ILITEK_MULTITOUCH) },
+ /* LG Melfas panel */
+ { .driver_data = MT_CLS_LG,
+ HID_USB_DEVICE(USB_VENDOR_ID_LG,
+ USB_DEVICE_ID_LG_MELFAS_MT) },
+
/* MosArt panels */
{ .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
MT_USB_DEVICE(USB_VENDOR_ID_ASUS,