HID: wiimote: Add Nintendo Balance-Board support

The Nintendo Balance-Board is a controller which behaves exactly like the
Wii Remote but reports all its data through a special extension device.
Hence, we can simply add the Balance-Board as extension device and we get
full support for it.

Tested-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/hid/hid-wiimote-ext.c b/drivers/hid/hid-wiimote-ext.c
index 0a1805c9b0e5..ae022b863593 100644
--- a/drivers/hid/hid-wiimote-ext.c
+++ b/drivers/hid/hid-wiimote-ext.c
@@ -34,6 +34,7 @@ enum wiiext_type {
         WIIEXT_NONE,            /* placeholder */
         WIIEXT_CLASSIC,         /* Nintendo classic controller */
         WIIEXT_NUNCHUCK,        /* Nintendo nunchuck controller */
+        WIIEXT_BALANCE_BOARD,   /* Nintendo balance board controller */
 };
 
 enum wiiext_keys {
@@ -151,6 +152,8 @@ static __u8 ext_read(struct wiimote_ext *ext)
                         type = WIIEXT_NUNCHUCK;
                 else if (rmem[0] == 0x01 && rmem[1] == 0x01)
                         type = WIIEXT_CLASSIC;
+                else if (rmem[0] == 0x04 && rmem[1] == 0x02)
+                        type = WIIEXT_BALANCE_BOARD;
         }
 
         wiimote_cmd_release(ext->wdata);
@@ -509,6 +512,55 @@ static void handler_classic(struct wiimote_ext *ext, const __u8 *payload)
         input_sync(ext->input);
 }
 
+static void handler_balance_board(struct wiimote_ext *ext, const __u8 *payload)
+{
+        __s32 val[4];
+
+        /*   Byte |  8  7  6  5  4  3  2  1  |
+         *   -----+--------------------------+
+         *    1   |    Top Right <15:8>      |
+         *    2   |    Top Right  <7:0>      |
+         *   -----+--------------------------+
+         *    3   | Bottom Right <15:8>      |
+         *    4   | Bottom Right  <7:0>      |
+         *   -----+--------------------------+
+         *    5   |     Top Left <15:8>      |
+         *    6   |     Top Left  <7:0>      |
+         *   -----+--------------------------+
+         *    7   |  Bottom Left <15:8>      |
+         *    8   |  Bottom Left  <7:0>      |
+         *   -----+--------------------------+
+         *
+         * These values represent the weight-measurements of the Wii-balance
+         * board with 16bit precision.
+         *
+         * The balance-board is never reported interleaved with motionp.
+         */
+
+        val[0] = payload[0];
+        val[0] <<= 8;
+        val[0] |= payload[1];
+
+        val[1] = payload[2];
+        val[1] <<= 8;
+        val[1] |= payload[3];
+
+        val[2] = payload[4];
+        val[2] <<= 8;
+        val[2] |= payload[5];
+
+        val[3] = payload[6];
+        val[3] <<= 8;
+        val[3] |= payload[7];
+
+        input_report_abs(ext->input, ABS_HAT0X, val[0]);
+        input_report_abs(ext->input, ABS_HAT0Y, val[1]);
+        input_report_abs(ext->input, ABS_HAT1X, val[2]);
+        input_report_abs(ext->input, ABS_HAT1Y, val[3]);
+
+        input_sync(ext->input);
+}
+
 /* call this with state.lock spinlock held */
 void wiiext_handle(struct wiimote_data *wdata, const __u8 *payload)
 {
@@ -523,6 +575,8 @@ void wiiext_handle(struct wiimote_data *wdata, const __u8 *payload)
                 handler_nunchuck(ext, payload);
         } else if (ext->ext_type == WIIEXT_CLASSIC) {
                 handler_classic(ext, payload);
+        } else if (ext->ext_type == WIIEXT_BALANCE_BOARD) {
+                handler_balance_board(ext, payload);
         }
 }
 
@@ -551,6 +605,11 @@ static ssize_t wiiext_show(struct device *dev, struct device_attribute *attr,
                         return sprintf(buf, "motionp+classic\n");
                 else
                         return sprintf(buf, "classic\n");
+        } else if (type == WIIEXT_BALANCE_BOARD) {
+                if (motionp)
+                        return sprintf(buf, "motionp+balanceboard\n");
+                else
+                        return sprintf(buf, "balanceboard\n");
         } else {
                 if (motionp)
                         return sprintf(buf, "motionp\n");