HID: asus: Add T100CHI bluetooth keyboard dock touchpad support

Put the touchpad in native (absolute coordinate mode) and export it to
userspace as a touchpad rather then as a mouse.

Note this requires HID_QUIRK_MULTI_INPUT as the T100CHI keyboard dock
has all functionality on a single HID interface and userspace expects
touchpads to be on a separate input_dev. Without MULTI_INPUT userspace
will ignore the keyboard part of the keyboard/touchpad combo.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 43fb4a3..50c294b 100644 (file)
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -41,6 +41,7 @@ MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad");
 
 #define T100_TPAD_INTF 2
 
+#define T100CHI_MOUSE_REPORT_ID 0x06
 #define FEATURE_REPORT_ID 0x0d
 #define INPUT_REPORT_ID 0x5d
 #define FEATURE_KBD_REPORT_ID 0x5a
@@ -117,6 +118,15 @@ static const struct asus_touchpad_info asus_t100ta_tp = {
        .max_contacts = 5,
 };
 
+static const struct asus_touchpad_info asus_t100chi_tp = {
+       .max_x = 2640,
+       .max_y = 1320,
+       .res_x = 31, /* units/mm */
+       .res_y = 29, /* units/mm */
+       .contact_size = 3,
+       .max_contacts = 4,
+};
+
 static void asus_report_contact_down(struct asus_drvdata *drvdat,
                int toolType, u8 *data)
 {
@@ -126,6 +136,12 @@ static void asus_report_contact_down(struct asus_drvdata *drvdat,
        x = (data[0] & CONTACT_X_MSB_MASK) << 4 | data[1];
        y = drvdat->tp->max_y - ((data[0] & CONTACT_Y_MSB_MASK) << 8 | data[2]);
 
+       input_report_abs(input, ABS_MT_POSITION_X, x);
+       input_report_abs(input, ABS_MT_POSITION_Y, y);
+
+       if (drvdat->tp->contact_size < 5)
+               return;
+
        if (toolType == MT_TOOL_PALM) {
                touch_major = MAX_TOUCH_MAJOR;
                pressure = MAX_PRESSURE;
@@ -134,8 +150,6 @@ static void asus_report_contact_down(struct asus_drvdata *drvdat,
                pressure = data[4] & CONTACT_PRESSURE_MASK;
        }
 
-       input_report_abs(input, ABS_MT_POSITION_X, x);
-       input_report_abs(input, ABS_MT_POSITION_Y, y);
        input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major);
        input_report_abs(input, ABS_MT_PRESSURE, pressure);
 }
@@ -147,6 +161,9 @@ static void asus_report_tool_width(struct asus_drvdata *drvdat)
        struct input_mt_slot *oldest;
        int oldid, count, i;
 
+       if (drvdat->tp->contact_size < 5)
+               return;
+
        oldest = NULL;
        oldid = mt->trkid;
        count = 0;
@@ -172,7 +189,7 @@ static void asus_report_tool_width(struct asus_drvdata *drvdat)
 
 static int asus_report_input(struct asus_drvdata *drvdat, u8 *data, int size)
 {
-       int i;
+       int i, toolType = MT_TOOL_FINGER;
        u8 *contactData = data + 2;
 
        if (size != 3 + drvdat->tp->contact_size * drvdat->tp->max_contacts)
@@ -180,7 +197,9 @@ static int asus_report_input(struct asus_drvdata *drvdat, u8 *data, int size)
 
        for (i = 0; i < drvdat->tp->max_contacts; i++) {
                bool down = !!(data[1] & BIT(i+3));
-               int toolType = contactData[3] & CONTACT_TOOL_TYPE_MASK ?
+
+               if (drvdat->tp->contact_size >= 5)
+                       toolType = contactData[3] & CONTACT_TOOL_TYPE_MASK ?
                                                MT_TOOL_PALM : MT_TOOL_FINGER;
 
                input_mt_slot(drvdat->input, i);
@@ -359,6 +378,11 @@ static int asus_input_configured(struct hid_device *hdev, struct hid_input *hi)
        struct input_dev *input = hi->input;
        struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
 
+       /* T100CHI uses MULTI_INPUT, bind the touchpad to the mouse hid_input */
+       if (drvdata->quirks & QUIRK_T100CHI &&
+           hi->report->id != T100CHI_MOUSE_REPORT_ID)
+               return 0;
+
        if (drvdata->tp) {
                int ret;
 
@@ -368,9 +392,15 @@ static int asus_input_configured(struct hid_device *hdev, struct hid_input *hi)
                                     drvdata->tp->max_y, 0, 0);
                input_abs_set_res(input, ABS_MT_POSITION_X, drvdata->tp->res_x);
                input_abs_set_res(input, ABS_MT_POSITION_Y, drvdata->tp->res_y);
-               input_set_abs_params(input, ABS_TOOL_WIDTH, 0, MAX_TOUCH_MAJOR, 0, 0);
-               input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, MAX_TOUCH_MAJOR, 0, 0);
-               input_set_abs_params(input, ABS_MT_PRESSURE, 0, MAX_PRESSURE, 0, 0);
+
+               if (drvdata->tp->contact_size >= 5) {
+                       input_set_abs_params(input, ABS_TOOL_WIDTH, 0,
+                                            MAX_TOUCH_MAJOR, 0, 0);
+                       input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
+                                            MAX_TOUCH_MAJOR, 0, 0);
+                       input_set_abs_params(input, ABS_MT_PRESSURE, 0,
+                                             MAX_PRESSURE, 0, 0);
+               }
 
                __set_bit(BTN_LEFT, input->keybit);
                __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
@@ -408,6 +438,26 @@ static int asus_input_mapping(struct hid_device *hdev,
                return -1;
        }
 
+       /*
+        * Ignore a bunch of bogus collections in the T100CHI descriptor.
+        * This avoids a bunch of non-functional hid_input devices getting
+        * created because of the T100CHI using HID_QUIRK_MULTI_INPUT.
+        */
+       if (drvdata->quirks & QUIRK_T100CHI) {
+               if (field->application == (HID_UP_GENDESK | 0x0080) ||
+                   usage->hid == (HID_UP_GENDEVCTRLS | 0x0024) ||
+                   usage->hid == (HID_UP_GENDEVCTRLS | 0x0025) ||
+                   usage->hid == (HID_UP_GENDEVCTRLS | 0x0026))
+                       return -1;
+               /*
+                * We use the hid_input for the mouse report for the touchpad,
+                * keep the left button, to avoid the core removing it.
+                */
+               if (field->application == HID_GD_MOUSE &&
+                   usage->hid != (HID_UP_BUTTON | 1))
+                       return -1;
+       }
+
        /* ASUS-specific keyboard hotkeys */
        if ((usage->hid & HID_USAGE_PAGE) == 0xff310000) {
                set_bit(EV_REP, hi->input->evbit);
@@ -559,6 +609,16 @@ static int asus_probe(struct hid_device *hdev, const struct hid_device_id *id)
                }
        }
 
+       if (drvdata->quirks & QUIRK_T100CHI) {
+               /*
+                * All functionality is on a single HID interface and for
+                * userspace the touchpad must be a separate input_dev.
+                */
+               hdev->quirks |= HID_QUIRK_MULTI_INPUT |
+                               HID_QUIRK_NO_EMPTY_INPUT;
+               drvdata->tp = &asus_t100chi_tp;
+       }
+
        if (drvdata->quirks & QUIRK_NO_INIT_REPORTS)
                hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;