Input: HID - add support for fn key on Apple PowerBooks

This patch implements support for the fn key on Apple PowerBooks using
USB based keyboards and makes them behave like their ADB counterparts.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Acked-by: Rene Nussbaumer <linux-kernel@killerfox.forkbomb.ch>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

4 files changed, 201 insertions, 14 deletions

diff --git a/drivers/usb/input/Kconfig b/drivers/usb/input/Kconfig
index 509dd0a04c54..5246b35301de 100644
--- a/drivers/usb/input/Kconfig
+++ b/drivers/usb/input/Kconfig
@@ -37,6 +37,16 @@ config USB_HIDINPUT
 
           If unsure, say Y.
 
+config USB_HIDINPUT_POWERBOOK
+        bool "Enable support for iBook/PowerBook special keys"
+        default n
+        depends on USB_HIDINPUT
+        help
+          Say Y here if you want support for the special keys (Fn, Numlock) on
+          Apple iBooks and PowerBooks.
+
+          If unsure, say N.
+
 config HID_FF
         bool "Force feedback support (EXPERIMENTAL)"
         depends on USB_HIDINPUT && EXPERIMENTAL
diff --git a/drivers/usb/input/hid-core.c b/drivers/usb/input/hid-core.c
index 1a2d20303ed8..a91e72c41415 100644
--- a/drivers/usb/input/hid-core.c
+++ b/drivers/usb/input/hid-core.c
@@ -1585,6 +1585,14 @@ static const struct hid_blacklist {
 
         { USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION, HID_QUIRK_CYMOTION },
 
+        { USB_VENDOR_ID_APPLE, 0x020E, HID_QUIRK_POWERBOOK_HAS_FN },
+        { USB_VENDOR_ID_APPLE, 0x020F, HID_QUIRK_POWERBOOK_HAS_FN },
+        { USB_VENDOR_ID_APPLE, 0x0214, HID_QUIRK_POWERBOOK_HAS_FN },
+        { USB_VENDOR_ID_APPLE, 0x0215, HID_QUIRK_POWERBOOK_HAS_FN },
+        { USB_VENDOR_ID_APPLE, 0x0216, HID_QUIRK_POWERBOOK_HAS_FN },
+        { USB_VENDOR_ID_APPLE, 0x030A, HID_QUIRK_POWERBOOK_HAS_FN },
+        { USB_VENDOR_ID_APPLE, 0x030B, HID_QUIRK_POWERBOOK_HAS_FN },
+
         { 0, 0 }
 };
 
diff --git a/drivers/usb/input/hid-input.c b/drivers/usb/input/hid-input.c
index 36a08c04c460..cb0d80f49252 100644
--- a/drivers/usb/input/hid-input.c
+++ b/drivers/usb/input/hid-input.c
@@ -73,6 +73,160 @@ static const struct {
 #define map_key_clear(c)        do { map_key(c); clear_bit(c, bit); } while (0)
 #define map_ff_effect(c)        do { set_bit(c, input->ffbit); } while (0)
 
+#ifdef CONFIG_USB_HIDINPUT_POWERBOOK
+
+struct hidinput_key_translation {
+        u16 from;
+        u16 to;
+        u8 flags;
+};
+
+#define POWERBOOK_FLAG_FKEY 0x01
+
+static struct hidinput_key_translation powerbook_fn_keys[] = {
+        { KEY_BACKSPACE, KEY_DELETE },
+        { KEY_F1,       KEY_BRIGHTNESSDOWN,     POWERBOOK_FLAG_FKEY },
+        { KEY_F2,       KEY_BRIGHTNESSUP,       POWERBOOK_FLAG_FKEY },
+        { KEY_F3,       KEY_MUTE,               POWERBOOK_FLAG_FKEY },
+        { KEY_F4,       KEY_VOLUMEDOWN,         POWERBOOK_FLAG_FKEY },
+        { KEY_F5,       KEY_VOLUMEUP,           POWERBOOK_FLAG_FKEY },
+        { KEY_F6,       KEY_NUMLOCK,            POWERBOOK_FLAG_FKEY },
+        { KEY_F7,       KEY_SWITCHVIDEOMODE,    POWERBOOK_FLAG_FKEY },
+        { KEY_F8,       KEY_KBDILLUMTOGGLE,     POWERBOOK_FLAG_FKEY },
+        { KEY_F9,       KEY_KBDILLUMDOWN,       POWERBOOK_FLAG_FKEY },
+        { KEY_F10,      KEY_KBDILLUMUP,         POWERBOOK_FLAG_FKEY },
+        { KEY_UP,       KEY_PAGEUP },
+        { KEY_DOWN,     KEY_PAGEDOWN },
+        { KEY_LEFT,     KEY_HOME },
+        { KEY_RIGHT,    KEY_END },
+        { }
+};
+
+static struct hidinput_key_translation powerbook_numlock_keys[] = {
+        { KEY_J,        KEY_KP1 },
+        { KEY_K,        KEY_KP2 },
+        { KEY_L,        KEY_KP3 },
+        { KEY_U,        KEY_KP4 },
+        { KEY_I,        KEY_KP5 },
+        { KEY_O,        KEY_KP6 },
+        { KEY_7,        KEY_KP7 },
+        { KEY_8,        KEY_KP8 },
+        { KEY_9,        KEY_KP9 },
+        { KEY_M,        KEY_KP0 },
+        { KEY_DOT,      KEY_KPDOT },
+        { KEY_SLASH,    KEY_KPPLUS },
+        { KEY_SEMICOLON, KEY_KPMINUS },
+        { KEY_P,        KEY_KPASTERISK },
+        { KEY_MINUS,    KEY_KPEQUAL },
+        { KEY_0,        KEY_KPSLASH },
+        { KEY_F6,       KEY_NUMLOCK },
+        { KEY_KPENTER,  KEY_KPENTER },
+        { KEY_BACKSPACE, KEY_BACKSPACE },
+        { }
+};
+
+static int usbhid_pb_fnmode = 1;
+module_param_named(pb_fnmode, usbhid_pb_fnmode, int, 0644);
+MODULE_PARM_DESC(pb_fnmode,
+        "Mode of fn key on PowerBooks (0 = disabled, 1 = fkeyslast, 2 = fkeysfirst)");
+
+static struct hidinput_key_translation *find_translation(struct hidinput_key_translation *table, u16 from)
+{
+        struct hidinput_key_translation *trans;
+
+        /* Look for the translation */
+        for (trans = table; trans->from; trans++)
+                if (trans->from == from)
+                        return trans;
+
+        return NULL;
+}
+
+static int hidinput_pb_event(struct hid_device *hid, struct input_dev *input,
+                             struct hid_usage *usage, __s32 value)
+{
+        struct hidinput_key_translation *trans;
+
+        if (usage->code == KEY_FN) {
+                if (value) hid->quirks |=  HID_QUIRK_POWERBOOK_FN_ON;
+                else       hid->quirks &= ~HID_QUIRK_POWERBOOK_FN_ON;
+
+                input_event(input, usage->type, usage->code, value);
+
+                return 1;
+        }
+
+        if (usbhid_pb_fnmode) {
+                int do_translate;
+
+                trans = find_translation(powerbook_fn_keys, usage->code);
+                if (trans) {
+                        if (test_bit(usage->code, hid->pb_pressed_fn))
+                                do_translate = 1;
+                        else if (trans->flags & POWERBOOK_FLAG_FKEY)
+                                do_translate =
+                                        (usbhid_pb_fnmode == 2 &&  (hid->quirks & HID_QUIRK_POWERBOOK_FN_ON)) ||
+                                        (usbhid_pb_fnmode == 1 && !(hid->quirks & HID_QUIRK_POWERBOOK_FN_ON));
+                        else
+                                do_translate = (hid->quirks & HID_QUIRK_POWERBOOK_FN_ON);
+
+                        if (do_translate) {
+                                if (value)
+                                        set_bit(usage->code, hid->pb_pressed_fn);
+                                else
+                                        clear_bit(usage->code, hid->pb_pressed_fn);
+
+                                input_event(input, usage->type, trans->to, value);
+
+                                return 1;
+                        }
+                }
+
+                if (test_bit(usage->code, hid->pb_pressed_numlock) ||
+                    test_bit(LED_NUML, input->led)) {
+                        trans = find_translation(powerbook_numlock_keys, usage->code);
+
+                        if (trans) {
+                                if (value)
+                                        set_bit(usage->code, hid->pb_pressed_numlock);
+                                else
+                                        clear_bit(usage->code, hid->pb_pressed_numlock);
+
+                                input_event(input, usage->type, trans->to, value);
+                        }
+
+                        return 1;
+                }
+        }
+
+        return 0;
+}
+
+static void hidinput_pb_setup(struct input_dev *input)
+{
+        struct hidinput_key_translation *trans;
+
+        set_bit(KEY_NUMLOCK, input->keybit);
+
+        /* Enable all needed keys */
+        for (trans = powerbook_fn_keys; trans->from; trans++)
+                set_bit(trans->to, input->keybit);
+
+        for (trans = powerbook_numlock_keys; trans->from; trans++)
+                set_bit(trans->to, input->keybit);
+}
+#else
+static inline int hidinput_pb_event(struct hid_device *hid, struct input_dev *input,
+                                    struct hid_usage *usage, __s32 value)
+{
+        return 0;
+}
+
+static inline void hidinput_pb_setup(struct input_dev *input)
+{
+}
+#endif
+
 static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_field *field,
                                      struct hid_usage *usage)
 {
@@ -336,7 +490,12 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 
                         set_bit(EV_REP, input->evbit);
                         switch(usage->hid & HID_USAGE) {
-                                case 0x003: map_key_clear(KEY_FN);              break;
+                                case 0x003:
+                                        /* The fn key on Apple PowerBooks */
+                                        map_key_clear(KEY_FN);
+                                        hidinput_pb_setup(input);
+                                        break;
+
                                 default:    goto ignore;
                         }
                         break;
@@ -493,6 +652,9 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
                 return;
         }
 
+        if ((hid->quirks & HID_QUIRK_POWERBOOK_HAS_FN) && hidinput_pb_event(hid, input, usage, value))
+                return;
+
         if (usage->hat_min < usage->hat_max || usage->hat_dir) {
                 int hat_dir = usage->hat_dir;
                 if (!hat_dir)
@@ -535,7 +697,7 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
                 return;
         }
 
-        if((usage->type == EV_KEY) && (usage->code == 0)) /* Key 0 is "unassigned", not KEY_UNKNOWN */
+        if ((usage->type == EV_KEY) && (usage->code == 0)) /* Key 0 is "unassigned", not KEY_UNKNOWN */
                 return;
 
         input_event(input, usage->type, usage->code, value);
diff --git a/drivers/usb/input/hid.h b/drivers/usb/input/hid.h
index 335316c7233b..8b0d4346ce9c 100644
--- a/drivers/usb/input/hid.h
+++ b/drivers/usb/input/hid.h
@@ -235,18 +235,20 @@ struct hid_item {
  * HID device quirks.
  */
 
-#define HID_QUIRK_INVERT                        0x001
-#define HID_QUIRK_NOTOUCH                       0x002
-#define HID_QUIRK_IGNORE                        0x004
-#define HID_QUIRK_NOGET                         0x008
-#define HID_QUIRK_HIDDEV                        0x010
-#define HID_QUIRK_BADPAD                        0x020
-#define HID_QUIRK_MULTI_INPUT                   0x040
-#define HID_QUIRK_2WHEEL_MOUSE_HACK_7           0x080
-#define HID_QUIRK_2WHEEL_MOUSE_HACK_5           0x100
-#define HID_QUIRK_2WHEEL_MOUSE_HACK_ON          0x200
-#define HID_QUIRK_2WHEEL_POWERMOUSE             0x400
-#define HID_QUIRK_CYMOTION                      0x800
+#define HID_QUIRK_INVERT                        0x00000001
+#define HID_QUIRK_NOTOUCH                       0x00000002
+#define HID_QUIRK_IGNORE                        0x00000004
+#define HID_QUIRK_NOGET                         0x00000008
+#define HID_QUIRK_HIDDEV                        0x00000010
+#define HID_QUIRK_BADPAD                        0x00000020
+#define HID_QUIRK_MULTI_INPUT                   0x00000040
+#define HID_QUIRK_2WHEEL_MOUSE_HACK_7           0x00000080
+#define HID_QUIRK_2WHEEL_MOUSE_HACK_5           0x00000100
+#define HID_QUIRK_2WHEEL_MOUSE_HACK_ON          0x00000200
+#define HID_QUIRK_2WHEEL_POWERMOUSE             0x00000400
+#define HID_QUIRK_CYMOTION                      0x00000800
+#define HID_QUIRK_POWERBOOK_HAS_FN              0x00001000
+#define HID_QUIRK_POWERBOOK_FN_ON               0x00002000
 
 /*
  * This is the global environment of the parser. This information is
@@ -432,6 +434,11 @@ struct hid_device {							/* device report descriptor */
         void (*ff_exit)(struct hid_device*);                            /* Called by hid_exit_ff(hid) */
         int (*ff_event)(struct hid_device *hid, struct input_dev *input,
                         unsigned int type, unsigned int code, int value);
+
+#ifdef CONFIG_USB_HIDINPUT_POWERBOOK
+        unsigned long pb_pressed_fn[NBITS(KEY_MAX)];
+        unsigned long pb_pressed_numlock[NBITS(KEY_MAX)];
+#endif
 };
 
 #define HID_GLOBAL_STACK_SIZE 4