/* * drivers/macintosh/mac_hid.c * * HID support stuff for Macintosh computers. * * Copyright (C) 2000 Franz Sirl. * * This file will soon be removed in favor of an uinput userspace tool. */ #include <linux/init.h> #include <linux/proc_fs.h> #include <linux/sysctl.h> #include <linux/input.h> #include <linux/module.h> #include <linux/slab.h> MODULE_LICENSE("GPL"); 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 struct input_dev *mac_hid_emumouse_dev; static DEFINE_MUTEX(mac_hid_emumouse_mutex); 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(struct 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 = mutex_lock_killable(&mac_hid_emumouse_mutex); if (rc) return 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; mutex_unlock(&mac_hid_emumouse_mutex); return rc; } /* file(s) in /proc/sys/dev/mac_hid */ static struct ctl_table mac_hid_files[] = { { .procname = "mouse_button_emulation", .data = &mouse_emulate_buttons, .maxlen = sizeof(int), .mode = 0644, .proc_handler = mac_hid_toggle_emumouse, }, { .procname = "mouse_button2_keycode", .data = &mouse_button2_keycode, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "mouse_button3_keycode", .data = &mouse_button3_keycode, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, { } }; /* dir in /proc/sys/dev */ static struct ctl_table mac_hid_dir[] = { { .procname = "mac_hid", .maxlen = 0, .mode = 0555, .child = mac_hid_files, }, { } }; /* /proc/sys/dev itself, in case that is not there yet */ static struct ctl_table mac_hid_root_dir[] = { { .procname = "dev", .maxlen = 0, .mode = 0555, .child = mac_hid_dir, }, { } }; static struct ctl_table_header *mac_hid_sysctl_header; static int __init mac_hid_init(void) { mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); if (!mac_hid_sysctl_header) return -ENOMEM; return 0; } module_init(mac_hid_init); static void __exit mac_hid_exit(void) { unregister_sysctl_table(mac_hid_sysctl_header); if (mouse_emulate_buttons) mac_hid_stop_emulation(); } module_exit(mac_hid_exit);