1 files changed, 196 insertions, 70 deletions

diff --git a/drivers/macintosh/mac_hid.c b/drivers/macintosh/mac_hid.c
index 7b4ef5bb556b..e943d2a29253 100644
--- a/drivers/macintosh/mac_hid.c
+++ b/drivers/macintosh/mac_hid.c
@@ -13,17 +13,197 @@
 #include <linux/sysctl.h>
 #include <linux/input.h>
 #include <linux/module.h>
-#include <linux/kbd_kern.h>
 
+MODULE_LICENSE("GPL");
 
-static struct input_dev *emumousebtn;
-static int emumousebtn_input_register(void);
 static int mouse_emulate_buttons;
 static int mouse_button2_keycode = KEY_RIGHTCTRL;	/* right control key */
 static int mouse_button3_keycode = KEY_RIGHTALT;	/* right option key */
-static int mouse_last_keycode;
 
-#if defined(CONFIG_SYSCTL)
+static struct input_dev *mac_hid_emumouse_dev;
+
+static int mac_hid_create_emumouse(void)
+{
+	static struct lock_class_key mac_hid_emumouse_dev_event_class;
+	static struct lock_class_key mac_hid_emumouse_dev_mutex_class;
+	int err;
+
+	mac_hid_emumouse_dev = input_allocate_device();
+	if (!mac_hid_emumouse_dev)
+		return -ENOMEM;
+
+	lockdep_set_class(&mac_hid_emumouse_dev->event_lock,
+			  &mac_hid_emumouse_dev_event_class);
+	lockdep_set_class(&mac_hid_emumouse_dev->mutex,
+			  &mac_hid_emumouse_dev_mutex_class);
+
+	mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";
+	mac_hid_emumouse_dev->id.bustype = BUS_ADB;
+	mac_hid_emumouse_dev->id.vendor = 0x0001;
+	mac_hid_emumouse_dev->id.product = 0x0001;
+	mac_hid_emumouse_dev->id.version = 0x0100;
+
+	mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+	mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =
+		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
+	mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
+
+	err = input_register_device(mac_hid_emumouse_dev);
+	if (err) {
+		input_free_device(mac_hid_emumouse_dev);
+		mac_hid_emumouse_dev = NULL;
+		return err;
+	}
+
+	return 0;
+}
+
+static void mac_hid_destroy_emumouse(void)
+{
+	input_unregister_device(mac_hid_emumouse_dev);
+	mac_hid_emumouse_dev = NULL;
+}
+
+static bool mac_hid_emumouse_filter(struct input_handle *handle,
+				    unsigned int type, unsigned int code,
+				    int value)
+{
+	unsigned int btn;
+
+	if (type != EV_KEY)
+		return false;
+
+	if (code == mouse_button2_keycode)
+		btn = BTN_MIDDLE;
+	else if (code == mouse_button3_keycode)
+		btn = BTN_RIGHT;
+	else
+		return false;
+
+	input_report_key(mac_hid_emumouse_dev, btn, value);
+	input_sync(mac_hid_emumouse_dev);
+
+	return true;
+}
+
+static int mac_hid_emumouse_connect(struct input_handler *handler,
+				    struct input_dev *dev,
+				    const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int error;
+
+	/* Don't bind to ourselves */
+	if (dev == mac_hid_emumouse_dev)
+		return -ENODEV;
+
+	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = "mac-button-emul";
+
+	error = input_register_handle(handle);
+	if (error) {
+		printk(KERN_ERR
+			"mac_hid: Failed to register button emulation handle, "
+			"error %d\n", error);
+		goto err_free;
+	}
+
+	error = input_open_device(handle);
+	if (error) {
+		printk(KERN_ERR
+			"mac_hid: Failed to open input device, error %d\n",
+			error);
+		goto err_unregister;
+	}
+
+	return 0;
+
+ err_unregister:
+	input_unregister_handle(handle);
+ err_free:
+	kfree(handle);
+	return error;
+}
+
+static void mac_hid_emumouse_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static const struct input_device_id mac_hid_emumouse_ids[] = {
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+	},
+	{ },
+};
+
+MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);
+
+static struct input_handler mac_hid_emumouse_handler = {
+	.filter		= mac_hid_emumouse_filter,
+	.connect	= mac_hid_emumouse_connect,
+	.disconnect	= mac_hid_emumouse_disconnect,
+	.name		= "mac-button-emul",
+	.id_table	= mac_hid_emumouse_ids,
+};
+
+static int mac_hid_start_emulation(void)
+{
+	int err;
+
+	err = mac_hid_create_emumouse();
+	if (err)
+		return err;
+
+	err = input_register_handler(&mac_hid_emumouse_handler);
+	if (err) {
+		mac_hid_destroy_emumouse();
+		return err;
+	}
+
+	return 0;
+}
+
+static void mac_hid_stop_emulation(void)
+{
+	input_unregister_handler(&mac_hid_emumouse_handler);
+	mac_hid_destroy_emumouse();
+}
+
+static int mac_hid_toggle_emumouse(ctl_table *table, int write,
+				   void __user *buffer, size_t *lenp,
+				   loff_t *ppos)
+{
+	int *valp = table->data;
+	int old_val = *valp;
+	int rc;
+
+	rc = proc_dointvec(table, write, buffer, lenp, ppos);
+
+	if (rc == 0 && write && *valp != old_val) {
+		if (*valp == 1)
+			rc = mac_hid_start_emulation();
+		else if (*valp == 0)
+			mac_hid_stop_emulation();
+		else
+			rc = -EINVAL;
+	}
+
+	/* Restore the old value in case of error */
+	if (rc)
+		*valp = old_val;
+
+	return rc;
+}
+
 /* file(s) in /proc/sys/dev/mac_hid */
 static ctl_table mac_hid_files[] = {
 	{
@@ -31,7 +211,7 @@ static ctl_table mac_hid_files[] = {
 		.data		= &mouse_emulate_buttons,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= mac_hid_toggle_emumouse,
 	},
 	{
 		.procname	= "mouse_button2_keycode",
@@ -74,75 +254,21 @@ static ctl_table mac_hid_root_dir[] = {
 
 static struct ctl_table_header *mac_hid_sysctl_header;
 
-#endif /* endif CONFIG_SYSCTL */
-
-int mac_hid_mouse_emulate_buttons(int caller, unsigned int keycode, int down)
-{
-	switch (caller) {
-	case 1:
-		/* Called from keyboard.c */
-		if (mouse_emulate_buttons
-		    && (keycode == mouse_button2_keycode
-			|| keycode == mouse_button3_keycode)) {
-			if (mouse_emulate_buttons == 1) {
-				input_report_key(emumousebtn,
-						 keycode == mouse_button2_keycode ? BTN_MIDDLE : BTN_RIGHT,
-						 down);
-				input_sync(emumousebtn);
-				return 1;
-			}
-			mouse_last_keycode = down ? keycode : 0;
-		}
-		break;
-	}
-	return 0;
-}
-
-static struct lock_class_key emumousebtn_event_class;
-static struct lock_class_key emumousebtn_mutex_class;
-
-static int emumousebtn_input_register(void)
+static int __init mac_hid_init(void)
 {
-	int ret;
-
-	emumousebtn = input_allocate_device();
-	if (!emumousebtn)
+	mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
+	if (!mac_hid_sysctl_header)
 		return -ENOMEM;
 
-	lockdep_set_class(&emumousebtn->event_lock, &emumousebtn_event_class);
-	lockdep_set_class(&emumousebtn->mutex, &emumousebtn_mutex_class);
-
-	emumousebtn->name = "Macintosh mouse button emulation";
-	emumousebtn->id.bustype = BUS_ADB;
-	emumousebtn->id.vendor = 0x0001;
-	emumousebtn->id.product = 0x0001;
-	emumousebtn->id.version = 0x0100;
-
-	emumousebtn->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
-	emumousebtn->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
-		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
-	emumousebtn->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
-
-	ret = input_register_device(emumousebtn);
-	if (ret)
-		input_free_device(emumousebtn);
-
-	return ret;
+	return 0;
 }
+module_init(mac_hid_init);
 
-static int __init mac_hid_init(void)
+static void __exit mac_hid_exit(void)
 {
-	int err;
-
-	err = emumousebtn_input_register();
-	if (err)
-		return err;
-
-#if defined(CONFIG_SYSCTL)
-	mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
-#endif /* CONFIG_SYSCTL */
+	unregister_sysctl_table(mac_hid_sysctl_header);
 
-	return 0;
+	if (mouse_emulate_buttons)
+		mac_hid_stop_emulation();
 }
-
-device_initcall(mac_hid_init);
+module_exit(mac_hid_exit);