HID: multitouch: make use of HID_QUIRK_INPUT_PER_APP

We now have HID_QUIRK_INPUT_PER_APPLICATION that splits the devices
into several devices. This helps us as we can now rely on hid-input
to set the names for us.

Also, this helps removing some magical numbers '0' when calling
.input_configured().

The only thing to take care of is that the field .report in struct
hid_input is now null. We need to iterate over the full list of
reports attached to a hid_input.

This is required for some Advanced Silicon touchscreen to correctly apply
the HID_QUIRK_INPUT_PER_APPLICATION as they have 2 reports associated
with the hidinput node. One contains the Input data, the other one
contains the Output data.

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

1 files changed, 33 insertions, 39 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index dad2fbb0e3f8..43784d31a1a3 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1274,54 +1274,48 @@ static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
         struct mt_device *td = hid_get_drvdata(hdev);
         char *name;
         const char *suffix = NULL;
-        struct hid_field *field = hi->report->field[0];
+        unsigned int application = 0;
+        struct hid_report *report;
         int ret;
 
-        if (hi->report->id == td->mt_report_id) {
-                ret = mt_touch_input_configured(hdev, hi);
-                if (ret)
-                        return ret;
+        list_for_each_entry(report, &hi->reports, hidinput_list) {
+                application = report->application;
+                if (report->id == td->mt_report_id) {
+                        ret = mt_touch_input_configured(hdev, hi);
+                        if (ret)
+                                return ret;
+                }
+
+                /*
+                 * some egalax touchscreens have "application == DG_TOUCHSCREEN"
+                 * for the stylus. Check this first, and then rely on
+                 * the application field.
+                 */
+                if (report->field[0]->physical == HID_DG_STYLUS) {
+                        suffix = "Pen";
+                        /* force BTN_STYLUS to allow tablet matching in udev */
+                        __set_bit(BTN_STYLUS, hi->input->keybit);
+                }
         }
 
-        /*
-         * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
-         * for the stylus. Check this first, and then rely on the application
-         * field.
-         */
-        if (hi->report->field[0]->physical == HID_DG_STYLUS) {
-                suffix = "Pen";
-                /* force BTN_STYLUS to allow tablet matching in udev */
-                __set_bit(BTN_STYLUS, hi->input->keybit);
-        } else {
-                switch (field->application) {
+        if (!suffix) {
+                switch (application) {
                 case HID_GD_KEYBOARD:
-                        suffix = "Keyboard";
-                        break;
                 case HID_GD_KEYPAD:
-                        suffix = "Keypad";
-                        break;
                 case HID_GD_MOUSE:
-                        suffix = "Mouse";
-                        break;
-                case HID_DG_STYLUS:
-                        suffix = "Pen";
-                        /* force BTN_STYLUS to allow tablet matching in udev */
-                        __set_bit(BTN_STYLUS, hi->input->keybit);
-                        break;
-                case HID_DG_TOUCHSCREEN:
-                        /* we do not set suffix = "Touchscreen" */
-                        break;
                 case HID_DG_TOUCHPAD:
-                        suffix = "Touchpad";
-                        break;
                 case HID_GD_SYSTEM_CONTROL:
-                        suffix = "System Control";
-                        break;
                 case HID_CP_CONSUMER_CONTROL:
-                        suffix = "Consumer Control";
-                        break;
                 case HID_GD_WIRELESS_RADIO_CTLS:
-                        suffix = "Wireless Radio Control";
+                        /* already handled by hid core */
+                        break;
+                case HID_DG_TOUCHSCREEN:
+                        /* we do not set suffix = "Touchscreen" */
+                        hi->input->name = hdev->name;
+                        break;
+                case HID_DG_STYLUS:
+                        /* force BTN_STYLUS to allow tablet matching in udev */
+                        __set_bit(BTN_STYLUS, hi->input->keybit);
                         break;
                 case HID_VD_ASUS_CUSTOM_MEDIA_KEYS:
                         suffix = "Custom Media Keys";
@@ -1459,10 +1453,10 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
         /*
          * This allows the driver to handle different input sensors
-         * that emits events through different reports on the same HID
+         * that emits events through different applications on the same HID
          * device.
          */
-        hdev->quirks |= HID_QUIRK_MULTI_INPUT;
+        hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
 
         timer_setup(&td->release_timer, mt_expired_timeout, 0);