HID: wiimote: add support for Guitar-Hero guitars

Apart from drums, Guitar-Hero also ships with guitars. Use the recently
introduced input ABS/BTN-bits to report this to user-space.

Devices are reported as "Nintendo Wii Remote Guitar". If I ever get my
hands on "RockBand" guitars, I will try to report them via the same
interface so user-space does not have to bother which device it deals
with.

Signed-off-by: Nicolas.Adenis-Lamarre <nicolas.adenis.lamarre@gmail.com>
(add commit-msg and adjust to new BTN_* IDs)
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

3 files changed, 182 insertions, 0 deletions

diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c
index 946cdeff4798..d3055d1dbc06 100644
--- a/drivers/hid/hid-wiimote-core.c
+++ b/drivers/hid/hid-wiimote-core.c
@@ -459,6 +459,9 @@ static __u8 wiimote_cmd_read_ext(struct wiimote_data *wdata, __u8 *rmem)
         if (rmem[0] == 0x01 && rmem[1] == 0x00 &&
             rmem[4] == 0x01 && rmem[5] == 0x03)
                 return WIIMOTE_EXT_GUITAR_HERO_DRUMS;
+        if (rmem[0] == 0x00 && rmem[1] == 0x00 &&
+            rmem[4] == 0x01 && rmem[5] == 0x03)
+                return WIIMOTE_EXT_GUITAR_HERO_GUITAR;
 
         return WIIMOTE_EXT_UNKNOWN;
 }
@@ -493,6 +496,7 @@ static bool wiimote_cmd_map_mp(struct wiimote_data *wdata, __u8 exttype)
         switch (exttype) {
         case WIIMOTE_EXT_CLASSIC_CONTROLLER:
         case WIIMOTE_EXT_GUITAR_HERO_DRUMS:
+        case WIIMOTE_EXT_GUITAR_HERO_GUITAR:
                 wmem = 0x07;
                 break;
         case WIIMOTE_EXT_NUNCHUK:
@@ -1084,6 +1088,7 @@ static const char *wiimote_exttype_names[WIIMOTE_EXT_NUM] = {
         [WIIMOTE_EXT_BALANCE_BOARD] = "Nintendo Wii Balance Board",
         [WIIMOTE_EXT_PRO_CONTROLLER] = "Nintendo Wii U Pro Controller",
         [WIIMOTE_EXT_GUITAR_HERO_DRUMS] = "Nintendo Wii Guitar Hero Drums",
+        [WIIMOTE_EXT_GUITAR_HERO_GUITAR] = "Nintendo Wii Guitar Hero Guitar",
 };
 
 /*
@@ -1672,6 +1677,8 @@ static ssize_t wiimote_ext_show(struct device *dev,
                 return sprintf(buf, "procontroller\n");
         case WIIMOTE_EXT_GUITAR_HERO_DRUMS:
                 return sprintf(buf, "drums\n");
+        case WIIMOTE_EXT_GUITAR_HERO_GUITAR:
+                return sprintf(buf, "guitar\n");
         case WIIMOTE_EXT_UNKNOWN:
                 /* fallthrough */
         default:
diff --git a/drivers/hid/hid-wiimote-modules.c b/drivers/hid/hid-wiimote-modules.c
index 08a44a7fc5fd..7e124c351e67 100644
--- a/drivers/hid/hid-wiimote-modules.c
+++ b/drivers/hid/hid-wiimote-modules.c
@@ -2051,6 +2051,179 @@ static const struct wiimod_ops wiimod_drums = {
 };
 
 /*
+ * Guitar
+ * Guitar-Hero, Rock-Band and other games came bundled with guitars which can
+ * be plugged as extension to a Wiimote.
+ * We create a separate device for guitars and report all information via this
+ * input device.
+ */
+
+static void wiimod_guitar_in_ext(struct wiimote_data *wdata, const __u8 *ext)
+{
+        __u8 sx, sy, tb, wb, bd, bm, bp, bo, br, bb, bg, by, bu;
+
+        /*   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         *    1   |  0  |  0  |              SX <5:0>             |
+         *    2   |  0  |  0  |              SY <5:0>             |
+         *   -----+-----+-----+-----+-----------------------------+
+         *    3   |  0  |  0  |  0  |      TB <4:0>               |
+         *   -----+-----+-----+-----+-----------------------------+
+         *    4   |  0  |  0  |  0  |      WB <4:0>               |
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         *    5   |  1  | BD  |  1  | B-  |  1  | B+  |  1  |  1  |
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         *    6   | BO  | BR  | BB  | BG  | BY  |  1  |  1  | BU  |
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         * All buttons are 0 if pressed
+         *
+         * With Motion+ enabled, the following bits will get invalid:
+         *   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         *    1   |  0  |  0  |              SX <5:1>       |XXXXX|
+         *    2   |  0  |  0  |              SY <5:1>       |XXXXX|
+         *   -----+-----+-----+-----+-----------------------+-----+
+         *    3   |  0  |  0  |  0  |      TB <4:0>               |
+         *   -----+-----+-----+-----+-----------------------------+
+         *    4   |  0  |  0  |  0  |      WB <4:0>               |
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         *    5   |  1  | BD  |  1  | B-  |  1  | B+  |  1  |XXXXX|
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         *    6   | BO  | BR  | BB  | BG  | BY  |  1  |XXXXX|XXXXX|
+         *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
+         */
+
+        sx = ext[0] & 0x3f;
+        sy = ext[1] & 0x3f;
+        tb = ext[2] & 0x1f;
+        wb = ext[3] & 0x1f;
+        bd = !(ext[4] & 0x40);
+        bm = !(ext[4] & 0x10);
+        bp = !(ext[4] & 0x04);
+        bo = !(ext[5] & 0x80);
+        br = !(ext[5] & 0x40);
+        bb = !(ext[5] & 0x20);
+        bg = !(ext[5] & 0x10);
+        by = !(ext[5] & 0x08);
+        bu = !(ext[5] & 0x01);
+
+        input_report_abs(wdata->extension.input, ABS_X, sx - 0x20);
+        input_report_abs(wdata->extension.input, ABS_Y, sy - 0x20);
+        input_report_abs(wdata->extension.input, ABS_FRET_BOARD, tb);
+        input_report_abs(wdata->extension.input, ABS_WHAMMY_BAR, wb - 0x10);
+
+        input_report_key(wdata->extension.input, BTN_MODE, bm);
+        input_report_key(wdata->extension.input, BTN_START, bp);
+        input_report_key(wdata->extension.input, BTN_STRUM_BAR_UP, bu);
+        input_report_key(wdata->extension.input, BTN_STRUM_BAR_DOWN, bd);
+        input_report_key(wdata->extension.input, BTN_FRET_FAR_UP, bg);
+        input_report_key(wdata->extension.input, BTN_FRET_UP, br);
+        input_report_key(wdata->extension.input, BTN_FRET_MID, by);
+        input_report_key(wdata->extension.input, BTN_FRET_LOW, bb);
+        input_report_key(wdata->extension.input, BTN_FRET_FAR_LOW, bo);
+
+        input_sync(wdata->extension.input);
+}
+
+static int wiimod_guitar_open(struct input_dev *dev)
+{
+        struct wiimote_data *wdata = input_get_drvdata(dev);
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->state.flags |= WIIPROTO_FLAG_EXT_USED;
+        wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+        return 0;
+}
+
+static void wiimod_guitar_close(struct input_dev *dev)
+{
+        struct wiimote_data *wdata = input_get_drvdata(dev);
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->state.flags &= ~WIIPROTO_FLAG_EXT_USED;
+        wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+}
+
+static int wiimod_guitar_probe(const struct wiimod_ops *ops,
+                               struct wiimote_data *wdata)
+{
+        int ret;
+
+        wdata->extension.input = input_allocate_device();
+        if (!wdata->extension.input)
+                return -ENOMEM;
+
+        input_set_drvdata(wdata->extension.input, wdata);
+        wdata->extension.input->open = wiimod_guitar_open;
+        wdata->extension.input->close = wiimod_guitar_close;
+        wdata->extension.input->dev.parent = &wdata->hdev->dev;
+        wdata->extension.input->id.bustype = wdata->hdev->bus;
+        wdata->extension.input->id.vendor = wdata->hdev->vendor;
+        wdata->extension.input->id.product = wdata->hdev->product;
+        wdata->extension.input->id.version = wdata->hdev->version;
+        wdata->extension.input->name = WIIMOTE_NAME " Guitar";
+
+        set_bit(EV_KEY, wdata->extension.input->evbit);
+        set_bit(BTN_MODE, wdata->extension.input->keybit);
+        set_bit(BTN_START, wdata->extension.input->keybit);
+        set_bit(BTN_FRET_FAR_UP, wdata->extension.input->keybit);
+        set_bit(BTN_FRET_UP, wdata->extension.input->keybit);
+        set_bit(BTN_FRET_MID, wdata->extension.input->keybit);
+        set_bit(BTN_FRET_LOW, wdata->extension.input->keybit);
+        set_bit(BTN_FRET_FAR_LOW, wdata->extension.input->keybit);
+        set_bit(BTN_STRUM_BAR_UP, wdata->extension.input->keybit);
+        set_bit(BTN_STRUM_BAR_DOWN, wdata->extension.input->keybit);
+
+        set_bit(EV_ABS, wdata->extension.input->evbit);
+        set_bit(ABS_X, wdata->extension.input->absbit);
+        set_bit(ABS_Y, wdata->extension.input->absbit);
+        set_bit(ABS_FRET_BOARD, wdata->extension.input->absbit);
+        set_bit(ABS_WHAMMY_BAR, wdata->extension.input->absbit);
+        input_set_abs_params(wdata->extension.input,
+                             ABS_X, -32, 31, 1, 1);
+        input_set_abs_params(wdata->extension.input,
+                             ABS_Y, -32, 31, 1, 1);
+        input_set_abs_params(wdata->extension.input,
+                             ABS_FRET_BOARD, 0, 0x1f, 1, 1);
+        input_set_abs_params(wdata->extension.input,
+                             ABS_WHAMMY_BAR, 0, 0x0f, 1, 1);
+
+        ret = input_register_device(wdata->extension.input);
+        if (ret)
+                goto err_free;
+
+        return 0;
+
+err_free:
+        input_free_device(wdata->extension.input);
+        wdata->extension.input = NULL;
+        return ret;
+}
+
+static void wiimod_guitar_remove(const struct wiimod_ops *ops,
+                                 struct wiimote_data *wdata)
+{
+        if (!wdata->extension.input)
+                return;
+
+        input_unregister_device(wdata->extension.input);
+        wdata->extension.input = NULL;
+}
+
+static const struct wiimod_ops wiimod_guitar = {
+        .flags = 0,
+        .arg = 0,
+        .probe = wiimod_guitar_probe,
+        .remove = wiimod_guitar_remove,
+        .in_ext = wiimod_guitar_in_ext,
+};
+
+/*
  * Builtin Motion Plus
  * This module simply sets the WIIPROTO_FLAG_BUILTIN_MP protocol flag which
  * disables polling for Motion-Plus. This should be set only for devices which
@@ -2301,4 +2474,5 @@ const struct wiimod_ops *wiimod_ext_table[WIIMOTE_EXT_NUM] = {
         [WIIMOTE_EXT_BALANCE_BOARD] = &wiimod_bboard,
         [WIIMOTE_EXT_PRO_CONTROLLER] = &wiimod_pro,
         [WIIMOTE_EXT_GUITAR_HERO_DRUMS] = &wiimod_drums,
+        [WIIMOTE_EXT_GUITAR_HERO_GUITAR] = &wiimod_guitar,
 };
diff --git a/drivers/hid/hid-wiimote.h b/drivers/hid/hid-wiimote.h
index 6e18b55951fb..379cdfb6bd25 100644
--- a/drivers/hid/hid-wiimote.h
+++ b/drivers/hid/hid-wiimote.h
@@ -89,6 +89,7 @@ enum wiimote_exttype {
         WIIMOTE_EXT_BALANCE_BOARD,
         WIIMOTE_EXT_PRO_CONTROLLER,
         WIIMOTE_EXT_GUITAR_HERO_DRUMS,
+        WIIMOTE_EXT_GUITAR_HERO_GUITAR,
         WIIMOTE_EXT_NUM,
 };