HID: multitouch: add handling for pen in dual-sensors device

Dual sensors devices reports pen and touch on two different reports.
Using the quirk HID_QUIRK_MULTI_INPUT allows us to create a new input
device to forward pen events.

The quirk HID_QUIRK_NO_EMPTY_INPUT avoids the creation of input devices
for the not used mouse emulation present on Win7 certified devices.

Since hid-multitouch sets the quirk HID_QUIRK_NO_INPUT_SYNC, we need
to manually send SYN events for pen report too.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 62 insertions, 4 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6a934dee1b82..099a7ada13c7 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -99,6 +99,7 @@ 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 pen_report_id; /* the report ID of the pen device */
         __s8 inputmode;         /* InputMode HID feature, -1 if non-existent */
         __s8 inputmode_index;   /* InputMode HID feature index in the report */
         __s8 maxcontact_report_id;      /* Maximum Contact Number HID feature,
@@ -367,6 +368,43 @@ static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
         f->usages[f->length++] = usage->hid;
 }
 
+static int mt_pen_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+                struct hid_field *field, struct hid_usage *usage,
+                unsigned long **bit, int *max)
+{
+        struct mt_device *td = hid_get_drvdata(hdev);
+
+        td->pen_report_id = field->report->id;
+
+        return 0;
+}
+
+static int mt_pen_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+                struct hid_field *field, struct hid_usage *usage,
+                unsigned long **bit, int *max)
+{
+        return 0;
+}
+
+static int mt_pen_event(struct hid_device *hid, struct hid_field *field,
+                                struct hid_usage *usage, __s32 value)
+{
+        /* let hid-input handle it */
+        return 0;
+}
+
+static void mt_pen_report(struct hid_device *hid, struct hid_report *report)
+{
+        struct hid_field *field = report->field[0];
+
+        input_sync(field->hidinput->input);
+}
+
+static void mt_pen_input_configured(struct hid_device *hdev,
+                                        struct hid_input *hi)
+{
+}
+
 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
                 struct hid_field *field, struct hid_usage *usage,
                 unsigned long **bit, int *max)
@@ -740,14 +778,12 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
         * We need to ignore fields that belong to other collections
         * such as Mouse that might have the same GenericDesktop usages. */
         if (field->application != HID_DG_TOUCHSCREEN &&
+            field->application != HID_DG_PEN &&
             field->application != HID_DG_TOUCHPAD)
                 return -1;
 
-        /* eGalax devices provide a Digitizer.Stylus input which overrides
-         * the correct Digitizers.Finger X/Y ranges.
-         * Let's just ignore this input. */
         if (field->physical == HID_DG_STYLUS)
-                return -1;
+                return mt_pen_input_mapping(hdev, hi, field, usage, bit, max);
 
         return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
 }
@@ -756,6 +792,9 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
                 struct hid_field *field, struct hid_usage *usage,
                 unsigned long **bit, int *max)
 {
+        if (field->physical == HID_DG_STYLUS)
+                return mt_pen_input_mapped(hdev, hi, field, usage, bit, max);
+
         return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
 }
 
@@ -767,6 +806,9 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
         if (field->report->id == td->mt_report_id)
                 return mt_touch_event(hid, field, usage, value);
 
+        if (field->report->id == td->pen_report_id)
+                return mt_pen_event(hid, field, usage, value);
+
         /* ignore other reports */
         return 1;
 }
@@ -780,6 +822,9 @@ static void mt_report(struct hid_device *hid, struct hid_report *report)
 
         if (report->id == td->mt_report_id)
                 mt_touch_report(hid, report);
+
+        if (report->id == td->pen_report_id)
+                mt_pen_report(hid, report);
 }
 
 static void mt_set_input_mode(struct hid_device *hdev)
@@ -861,6 +906,9 @@ static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
 
         if (hi->report->id == td->mt_report_id)
                 mt_touch_input_configured(hdev, hi);
+
+        if (hi->report->id == td->pen_report_id)
+                mt_pen_input_configured(hdev, hi);
 }
 
 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
@@ -881,6 +929,14 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
          */
         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
 
+        /*
+         * This allows the driver to handle different input sensors
+         * that emits events through different reports on the same HID
+         * device.
+         */
+        hdev->quirks |= HID_QUIRK_MULTI_INPUT;
+        hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
+
         td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
         if (!td) {
                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
@@ -890,6 +946,8 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
         td->inputmode = -1;
         td->maxcontact_report_id = -1;
         td->cc_index = -1;
+        td->mt_report_id = -1;
+        td->pen_report_id = -1;
         hid_set_drvdata(hdev, td);
 
         td->fields = kzalloc(sizeof(struct mt_fields), GFP_KERNEL);