Input: elantech/SMBus - export all capabilities from the PS/2 node

The recent touchpads might not have all the information regarding the
characteristics through the I2C port.
On some Lenovo t480s, this results in the touchpad not being detected
as a clickpad, and on the Lenovo P52, this results in a failure while
fetching the resolution through I2C.

We need to imitate the Windows behavior: fetch the data under PS/2, and
limit the querries under I2C.

This patch prepares this by exporting the info from PS/2.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 057a3cf..ca10fd9 100644 (file)
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -1736,6 +1736,15 @@ static int elantech_query_info(struct psmouse *psmouse,
                        return -EINVAL;
 
                info->width = info->x_max / (traces - 1);
+
+               /* column number of traces */
+               info->x_traces = traces;
+
+               /* row number of traces */
+               traces = info->capabilities[2];
+               if ((traces >= 2) && (traces <= info->y_max))
+                       info->y_traces = traces;
+
                break;
        }
 
@@ -1781,17 +1790,45 @@ static int elantech_create_smbus(struct psmouse *psmouse,
                                 struct elantech_device_info *info,
                                 bool leave_breadcrumbs)
 {
-       const struct property_entry i2c_properties[] = {
-               PROPERTY_ENTRY_BOOL("elan,trackpoint"),
-               { },
-       };
+       struct property_entry i2c_props[11] = {};
        struct i2c_board_info smbus_board = {
                I2C_BOARD_INFO("elan_i2c", 0x15),
                .flags = I2C_CLIENT_HOST_NOTIFY,
        };
+       unsigned int idx = 0;
+
+       smbus_board.properties = i2c_props;
+
+       i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-x",
+                                                  info->x_max + 1);
+       i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-y",
+                                                  info->y_max + 1);
+       i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-x",
+                                                  info->x_min);
+       i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-y",
+                                                  info->y_min);
+       if (info->x_res)
+               i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-x-mm",
+                                                     (info->x_max + 1) / info->x_res);
+       if (info->y_res)
+               i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-y-mm",
+                                                     (info->y_max + 1) / info->y_res);
 
        if (info->has_trackpoint)
-               smbus_board.properties = i2c_properties;
+               i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,trackpoint");
+
+       if (info->has_middle_button)
+               i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,middle-button");
+
+       if (info->x_traces)
+               i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,x_traces",
+                                                     info->x_traces);
+       if (info->y_traces)
+               i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,y_traces",
+                                                     info->y_traces);
+
+       if (elantech_is_buttonpad(info))
+               i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,clickpad");
 
        return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false,
                                  leave_breadcrumbs);

diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
index 16174b5..a7eaa62 100644 (file)
--- a/drivers/input/mouse/elantech.h
+++ b/drivers/input/mouse/elantech.h
@@ -150,6 +150,8 @@ struct elantech_device_info {
        unsigned int y_max;
        unsigned int x_res;
        unsigned int y_res;
+       unsigned int x_traces;
+       unsigned int y_traces;
        unsigned int width;
        unsigned int bus;
        bool paritycheck;