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283 lines
6.1 KiB
283 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/macintosh/mac_hid.c |
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* |
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* HID support stuff for Macintosh computers. |
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* |
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* Copyright (C) 2000 Franz Sirl. |
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* |
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* This file will soon be removed in favor of an uinput userspace tool. |
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*/ |
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#include <linux/init.h> |
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#include <linux/proc_fs.h> |
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#include <linux/sysctl.h> |
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#include <linux/input.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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MODULE_LICENSE("GPL"); |
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static int mouse_emulate_buttons; |
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static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ |
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static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ |
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static struct input_dev *mac_hid_emumouse_dev; |
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static DEFINE_MUTEX(mac_hid_emumouse_mutex); |
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static int mac_hid_create_emumouse(void) |
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{ |
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static struct lock_class_key mac_hid_emumouse_dev_event_class; |
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static struct lock_class_key mac_hid_emumouse_dev_mutex_class; |
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int err; |
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mac_hid_emumouse_dev = input_allocate_device(); |
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if (!mac_hid_emumouse_dev) |
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return -ENOMEM; |
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lockdep_set_class(&mac_hid_emumouse_dev->event_lock, |
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&mac_hid_emumouse_dev_event_class); |
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lockdep_set_class(&mac_hid_emumouse_dev->mutex, |
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&mac_hid_emumouse_dev_mutex_class); |
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mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; |
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mac_hid_emumouse_dev->id.bustype = BUS_ADB; |
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mac_hid_emumouse_dev->id.vendor = 0x0001; |
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mac_hid_emumouse_dev->id.product = 0x0001; |
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mac_hid_emumouse_dev->id.version = 0x0100; |
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mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); |
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mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = |
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BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); |
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mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); |
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err = input_register_device(mac_hid_emumouse_dev); |
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if (err) { |
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input_free_device(mac_hid_emumouse_dev); |
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mac_hid_emumouse_dev = NULL; |
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return err; |
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} |
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return 0; |
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} |
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static void mac_hid_destroy_emumouse(void) |
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{ |
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input_unregister_device(mac_hid_emumouse_dev); |
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mac_hid_emumouse_dev = NULL; |
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} |
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static bool mac_hid_emumouse_filter(struct input_handle *handle, |
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unsigned int type, unsigned int code, |
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int value) |
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{ |
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unsigned int btn; |
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if (type != EV_KEY) |
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return false; |
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if (code == mouse_button2_keycode) |
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btn = BTN_MIDDLE; |
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else if (code == mouse_button3_keycode) |
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btn = BTN_RIGHT; |
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else |
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return false; |
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input_report_key(mac_hid_emumouse_dev, btn, value); |
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input_sync(mac_hid_emumouse_dev); |
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return true; |
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} |
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static int mac_hid_emumouse_connect(struct input_handler *handler, |
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struct input_dev *dev, |
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const struct input_device_id *id) |
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{ |
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struct input_handle *handle; |
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int error; |
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/* Don't bind to ourselves */ |
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if (dev == mac_hid_emumouse_dev) |
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return -ENODEV; |
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handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); |
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if (!handle) |
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return -ENOMEM; |
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handle->dev = dev; |
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handle->handler = handler; |
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handle->name = "mac-button-emul"; |
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error = input_register_handle(handle); |
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if (error) { |
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printk(KERN_ERR |
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"mac_hid: Failed to register button emulation handle, " |
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"error %d\n", error); |
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goto err_free; |
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} |
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error = input_open_device(handle); |
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if (error) { |
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printk(KERN_ERR |
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"mac_hid: Failed to open input device, error %d\n", |
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error); |
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goto err_unregister; |
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} |
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return 0; |
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err_unregister: |
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input_unregister_handle(handle); |
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err_free: |
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kfree(handle); |
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return error; |
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} |
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static void mac_hid_emumouse_disconnect(struct input_handle *handle) |
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{ |
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input_close_device(handle); |
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input_unregister_handle(handle); |
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kfree(handle); |
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} |
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static const struct input_device_id mac_hid_emumouse_ids[] = { |
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{ |
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT, |
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.evbit = { BIT_MASK(EV_KEY) }, |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); |
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static struct input_handler mac_hid_emumouse_handler = { |
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.filter = mac_hid_emumouse_filter, |
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.connect = mac_hid_emumouse_connect, |
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.disconnect = mac_hid_emumouse_disconnect, |
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.name = "mac-button-emul", |
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.id_table = mac_hid_emumouse_ids, |
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}; |
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static int mac_hid_start_emulation(void) |
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{ |
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int err; |
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err = mac_hid_create_emumouse(); |
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if (err) |
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return err; |
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err = input_register_handler(&mac_hid_emumouse_handler); |
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if (err) { |
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mac_hid_destroy_emumouse(); |
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return err; |
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} |
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return 0; |
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} |
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static void mac_hid_stop_emulation(void) |
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{ |
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input_unregister_handler(&mac_hid_emumouse_handler); |
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mac_hid_destroy_emumouse(); |
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} |
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static int mac_hid_toggle_emumouse(struct ctl_table *table, int write, |
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void *buffer, size_t *lenp, loff_t *ppos) |
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{ |
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int *valp = table->data; |
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int old_val = *valp; |
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int rc; |
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rc = mutex_lock_killable(&mac_hid_emumouse_mutex); |
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if (rc) |
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return rc; |
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rc = proc_dointvec(table, write, buffer, lenp, ppos); |
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if (rc == 0 && write && *valp != old_val) { |
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if (*valp == 1) |
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rc = mac_hid_start_emulation(); |
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else if (*valp == 0) |
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mac_hid_stop_emulation(); |
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else |
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rc = -EINVAL; |
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} |
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/* Restore the old value in case of error */ |
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if (rc) |
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*valp = old_val; |
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mutex_unlock(&mac_hid_emumouse_mutex); |
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return rc; |
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} |
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/* file(s) in /proc/sys/dev/mac_hid */ |
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static struct ctl_table mac_hid_files[] = { |
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{ |
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.procname = "mouse_button_emulation", |
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.data = &mouse_emulate_buttons, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = mac_hid_toggle_emumouse, |
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}, |
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{ |
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.procname = "mouse_button2_keycode", |
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.data = &mouse_button2_keycode, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ |
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.procname = "mouse_button3_keycode", |
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.data = &mouse_button3_keycode, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ } |
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}; |
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/* dir in /proc/sys/dev */ |
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static struct ctl_table mac_hid_dir[] = { |
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{ |
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.procname = "mac_hid", |
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.maxlen = 0, |
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.mode = 0555, |
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.child = mac_hid_files, |
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}, |
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{ } |
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}; |
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/* /proc/sys/dev itself, in case that is not there yet */ |
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static struct ctl_table mac_hid_root_dir[] = { |
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{ |
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.procname = "dev", |
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.maxlen = 0, |
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.mode = 0555, |
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.child = mac_hid_dir, |
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}, |
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{ } |
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}; |
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static struct ctl_table_header *mac_hid_sysctl_header; |
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static int __init mac_hid_init(void) |
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{ |
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mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); |
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if (!mac_hid_sysctl_header) |
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return -ENOMEM; |
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return 0; |
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} |
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module_init(mac_hid_init); |
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static void __exit mac_hid_exit(void) |
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{ |
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unregister_sysctl_table(mac_hid_sysctl_header); |
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if (mouse_emulate_buttons) |
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mac_hid_stop_emulation(); |
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} |
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module_exit(mac_hid_exit);
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