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Subject[PATCH/RFC?] usb/input: Add support for fn key on Apple PowerBooks
This patch adds a basic input hook support to usbhid because the quirks
method is outrunning the available bits. A hook for the Fn and Numlock
keys on Apple PowerBooks is included.

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>

---
diff -rNup linux-2.6.15-rc6.orig/drivers/usb/input/Kconfig linux-2.6.15-rc6/drivers/usb/input/Kconfig
--- linux-2.6.15-rc6.orig/drivers/usb/input/Kconfig 2005-12-22 20:51:57.000000000 +0100
+++ linux-2.6.15-rc6/drivers/usb/input/Kconfig 2005-12-22 22:01:09.000000000 +0100
@@ -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 -rNup linux-2.6.15-rc6.orig/drivers/usb/input/Makefile linux-2.6.15-rc6/drivers/usb/input/Makefile
--- linux-2.6.15-rc6.orig/drivers/usb/input/Makefile 2005-12-22 20:51:57.000000000 +0100
+++ linux-2.6.15-rc6/drivers/usb/input/Makefile 2005-12-22 23:16:54.000000000 +0100
@@ -25,6 +25,9 @@ endif
ifeq ($(CONFIG_HID_FF),y)
usbhid-objs += hid-ff.o
endif
+ifeq ($(CONFIG_USB_HIDINPUT_POWERBOOK),y)
+ usbhid-objs += hid-input-powerbook.o
+endif

obj-$(CONFIG_USB_AIPTEK) += aiptek.o
obj-$(CONFIG_USB_ATI_REMOTE) += ati_remote.o
diff -rNup linux-2.6.15-rc6.orig/drivers/usb/input/hid-input-powerbook.c linux-2.6.15-rc6/drivers/usb/input/hid-input-powerbook.c
--- linux-2.6.15-rc6.orig/drivers/usb/input/hid-input-powerbook.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.15-rc6/drivers/usb/input/hid-input-powerbook.c 2005-12-25 21:23:04.000000000 +0100
@@ -0,0 +1,226 @@
+/*
+ * Mapping for special keys on Apple iBook and PowerBook keyboards
+ *
+ * Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <linux/input.h>
+#include <linux/usb.h>
+
+#include "hid.h"
+
+#define map_key(c) do { usage->code = c; usage->type = EV_KEY; bit = input->keybit; max = KEY_MAX; } while (0)
+#define map_key_clear(c) do { map_key(c); clear_bit(c, bit); } while (0)
+
+#define APPLE_VENDOR_ID 0x05AC
+#define PB_ENABLED_FN 0x0001
+#define PB_FLAG_FKEY 0x0001
+
+static struct hid_input_hook_device input_pb_devices[] = {
+ { APPLE_VENDOR_ID, 0x020E },
+ { APPLE_VENDOR_ID, 0x020F },
+ { APPLE_VENDOR_ID, 0x0214 },
+ { APPLE_VENDOR_ID, 0x0215 },
+ { APPLE_VENDOR_ID, 0x0216 },
+ { }
+};
+
+struct input_pb_data {
+ u8 enabled_keys;
+};
+
+struct input_pb_translation {
+ u16 from;
+ u16 to;
+ u8 flags;
+};
+
+static struct input_pb_translation fn_keys[] = {
+ { KEY_BACKSPACE, KEY_DELETE },
+ { KEY_F1, KEY_BRIGHTNESSDOWN, PB_FLAG_FKEY },
+ { KEY_F2, KEY_BRIGHTNESSUP, PB_FLAG_FKEY },
+ { KEY_F3, KEY_MUTE, PB_FLAG_FKEY },
+ { KEY_F4, KEY_VOLUMEDOWN, PB_FLAG_FKEY },
+ { KEY_F5, KEY_VOLUMEUP, PB_FLAG_FKEY },
+ { KEY_F6, KEY_NUMLOCK, PB_FLAG_FKEY },
+ { KEY_F7, KEY_SWITCHVIDEOMODE, PB_FLAG_FKEY },
+ { KEY_F8, KEY_KBDILLUMTOGGLE, PB_FLAG_FKEY },
+ { KEY_F9, KEY_KBDILLUMDOWN, PB_FLAG_FKEY },
+ { KEY_F10, KEY_KBDILLUMUP, PB_FLAG_FKEY },
+ { KEY_UP, KEY_PAGEUP },
+ { KEY_DOWN, KEY_PAGEDOWN },
+ { KEY_LEFT, KEY_HOME },
+ { KEY_RIGHT, KEY_END },
+ { }
+};
+
+static struct input_pb_translation 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_ENTER, KEY_KPENTER },
+ { }
+};
+
+static int fkeysfirst = 1;
+module_param_named(pb_fkeysfirst, fkeysfirst, bool, 0644);
+MODULE_PARM_DESC(fkeysfirst, "Use fn special keys only while pressing fn");
+
+static int enablefnkeys = 1;
+module_param_named(pb_enablefnkeys, enablefnkeys, bool, 0644);
+MODULE_PARM_DESC(enablefnkeys, "Enable fn special keys");
+
+static int enablekeypad = 1;
+module_param_named(pb_enablekeypad, enablekeypad, bool, 0644);
+MODULE_PARM_DESC(enablekeypad, "Enable keypad keys");
+
+static inline struct input_pb_translation *find_translation(
+ struct input_pb_translation *table, int from)
+{
+ struct input_pb_translation *trans;
+
+ /* Look for the translation */
+ for(trans = table; trans->from && !(trans->from == from); trans++);
+
+ return (trans->from?trans:NULL);
+}
+
+static int input_pb_init(struct hid_device* hid)
+{
+ hid->hook_private = kzalloc(sizeof(struct input_pb_data), GFP_KERNEL);
+
+ if (!hid->hook_private)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void input_pb_exit(struct hid_device* hid)
+{
+ kfree(hid->hook_private);
+
+ return;
+}
+
+static int input_pb_event(struct hid_device *hid, struct hid_field *field,
+ struct hid_usage *usage, __s32 value, struct pt_regs *regs)
+{
+ struct input_pb_data *private = hid->hook_private;
+ struct input_dev *input;
+ struct input_pb_translation *trans;
+
+ if (usage->type != EV_KEY)
+ return -1;
+
+ input = field->hidinput->input;
+
+ switch(usage->code) {
+ case KEY_FN:
+ if (value) private->enabled_keys |= PB_ENABLED_FN;
+ else private->enabled_keys &= ~PB_ENABLED_FN;
+
+ input_event(input, usage->type, usage->code, value);
+
+ return 0;
+ }
+
+ if (enablefnkeys) {
+ trans = find_translation(fn_keys, usage->code);
+
+ if (trans) {
+ int known_key;
+
+ if (trans->flags & PB_FLAG_FKEY)
+ known_key =
+ ( fkeysfirst && (private->enabled_keys & PB_ENABLED_FN)) ||
+ (!fkeysfirst && !(private->enabled_keys & PB_ENABLED_FN));
+ else
+ known_key = (private->enabled_keys & PB_ENABLED_FN);
+
+ if (known_key) {
+ input_event(input, usage->type, trans->to, value);
+ return 0;
+ }
+ }
+ }
+
+ if (enablekeypad && test_bit(LED_NUML, input->led)) {
+ trans = find_translation(numlock_keys, usage->code);
+ if (trans)
+ input_event(input, usage->type, trans->to, value);
+
+ return 0;
+ }
+
+ return -1;
+}
+
+static int input_pb_conf(struct hid_input *hidinput, struct hid_field *field,
+ struct hid_usage *usage)
+{
+ struct input_dev *input = hidinput->input;
+ struct input_pb_translation *trans;
+ int max = 0;
+ unsigned long *bit = NULL;
+
+ field->hidinput = hidinput;
+
+ switch (usage->hid & HID_USAGE_PAGE) {
+ case HID_UP_CUSTOM:
+ switch(usage->hid & HID_USAGE) {
+ /* The fn key on Apple PowerBooks */
+ case 0x003:
+ map_key_clear(KEY_FN);
+
+ set_bit(KEY_FN, input->keybit);
+ set_bit(KEY_NUMLOCK, input->keybit);
+
+ /* Enable all needed keys */
+ for(trans = fn_keys; trans->from; trans++)
+ set_bit(trans->to, input->keybit);
+
+ for(trans = numlock_keys; trans->from; trans++)
+ set_bit(trans->to, input->keybit);
+
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+struct hid_input_hook usbhid_input_powerbook = {
+ .devices = input_pb_devices,
+ .init = input_pb_init,
+ .conf = input_pb_conf,
+ .event = input_pb_event,
+ .exit = input_pb_exit,
+};
diff -rNup linux-2.6.15-rc6.orig/drivers/usb/input/hid-input.c linux-2.6.15-rc6/drivers/usb/input/hid-input.c
--- linux-2.6.15-rc6.orig/drivers/usb/input/hid-input.c 2005-12-22 20:51:57.000000000 +0100
+++ linux-2.6.15-rc6/drivers/usb/input/hid-input.c 2005-12-25 21:48:09.000000000 +0100
@@ -63,6 +63,16 @@ static struct {
__s32 y;
} hid_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};

+/*
+ * This table contains pointers to hook structures.
+ */
+static struct hid_input_hook* hooks[] = {
+#ifdef CONFIG_USB_HIDINPUT_POWERBOOK
+ &usbhid_input_powerbook,
+#endif
+ NULL /* Terminating entry */
+};
+
#define map_abs(c) do { usage->code = c; usage->type = EV_ABS; bit = input->absbit; max = ABS_MAX; } while (0)
#define map_rel(c) do { usage->code = c; usage->type = EV_REL; bit = input->relbit; max = REL_MAX; } while (0)
#define map_key(c) do { usage->code = c; usage->type = EV_KEY; bit = input->keybit; max = KEY_MAX; } while (0)
@@ -73,6 +83,33 @@ static 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)

+static int hidinput_hook_wants_device(struct hid_input_hook *hook, u16 idVendor, u16 idProduct)
+{
+ struct hid_input_hook_device *curdev;
+
+ if (!hook->devices)
+ return 0;
+
+ /* Try to find device */
+ for (curdev = hook->devices;
+ curdev->idVendor && !(curdev->idVendor == idVendor && curdev->idProduct == idProduct);
+ curdev++);
+
+ return !!curdev->idVendor;
+}
+
+static struct hid_input_hook *hid_input_get_hook(u16 idVendor, u16 idProduct)
+{
+ struct hid_input_hook **hook;
+
+ for (hook = hooks;
+ *hook && !hidinput_hook_wants_device(*hook, idVendor, idProduct);
+ hook++);
+
+ return *hook;
+}
+
+
static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_field *field,
struct hid_usage *usage)
{
@@ -92,6 +129,12 @@ static void hidinput_configure_usage(str
if (field->flags & HID_MAIN_ITEM_CONSTANT)
goto ignore;

+ if(field->hidinput->hook) {
+ struct hid_input_hook *hook = field->hidinput->hook;
+ if(hook->conf && hook->conf(hidinput, field, usage) == 0)
+ return;
+ }
+
switch (usage->hid & HID_USAGE_PAGE) {

case HID_UP_UNDEFINED:
@@ -325,7 +368,6 @@ static void hidinput_configure_usage(str

set_bit(EV_REP, input->evbit);
switch(usage->hid & HID_USAGE) {
- case 0x003: map_key_clear(KEY_FN); break;
default: goto ignore;
}
break;
@@ -470,6 +512,12 @@ void hidinput_hid_event(struct hid_devic
if (!usage->type)
return;

+ if(field->hidinput->hook) {
+ struct hid_input_hook *hook = field->hidinput->hook;
+ if(hook->event && hook->event(hid, field, usage, value, regs) == 0)
+ return;
+ }
+
if (((hid->quirks & HID_QUIRK_2WHEEL_MOUSE_HACK_5) && (usage->hid == 0x00090005))
|| ((hid->quirks & HID_QUIRK_2WHEEL_MOUSE_HACK_7) && (usage->hid == 0x00090007))) {
if (value) hid->quirks |= HID_QUIRK_2WHEEL_MOUSE_HACK_ON;
@@ -648,6 +696,17 @@ int hidinput_connect(struct hid_device *
list_add_tail(&hidinput->list, &hid->inputs);
}

+ hidinput->hook = hid_input_get_hook(
+ le16_to_cpu(hid->dev->descriptor.idVendor),
+ le16_to_cpu(hid->dev->descriptor.idProduct));
+
+ if(hidinput->hook &&
+ hidinput->hook->init &&
+ hidinput->hook->init(hid) < 0) {
+ printk(KERN_ERR "input: Hook initialization failed.\n");
+ hidinput->hook = NULL;
+ }
+
for (i = 0; i < report->maxfield; i++)
for (j = 0; j < report->field[i]->maxusage; j++)
hidinput_configure_usage(hidinput, report->field[i],
@@ -681,6 +740,8 @@ void hidinput_disconnect(struct hid_devi
struct hid_input *hidinput, *next;

list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
+ if(hidinput->hook && hidinput->hook->exit)
+ hidinput->hook->exit(hid);
list_del(&hidinput->list);
input_unregister_device(hidinput->input);
kfree(hidinput);
diff -rNup linux-2.6.15-rc6.orig/drivers/usb/input/hid.h linux-2.6.15-rc6/drivers/usb/input/hid.h
--- linux-2.6.15-rc6.orig/drivers/usb/input/hid.h 2005-12-22 20:51:57.000000000 +0100
+++ linux-2.6.15-rc6/drivers/usb/input/hid.h 2005-12-25 21:50:33.000000000 +0100
@@ -368,10 +368,33 @@ struct hid_control_fifo {
#define HID_CTRL_RUNNING 1
#define HID_OUT_RUNNING 2

+struct hid_input_hook_device {
+ u16 idVendor;
+ u16 idProduct;
+};
+
+struct hid_input_hook {
+ struct list_head list;
+ struct hid_input_hook_device *devices;
+
+ int (*init)(struct hid_device*);
+ void (*exit)(struct hid_device*);
+ int (*event)(struct hid_device *hid, struct hid_field *field,
+ struct hid_usage *usage, __s32 value, struct pt_regs *regs);
+ int (*conf)(struct hid_input *hidinput, struct hid_field *field,
+ struct hid_usage *usage);
+};
+
+#ifdef CONFIG_USB_HIDINPUT_POWERBOOK
+extern struct hid_input_hook usbhid_input_powerbook;
+#endif
+
struct hid_input {
struct list_head list;
struct hid_report *report;
struct input_dev *input;
+
+ struct hid_input_hook *hook;
};

struct hid_device { /* device report descriptor */
@@ -431,6 +454,8 @@ struct hid_device { /* device repo
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);
+
+ void *hook_private;
};

#define HID_GLOBAL_STACK_SIZE 4
-
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