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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * drivers/macintosh/mac_hid.c4 *5 * HID support stuff for Macintosh computers.6 *7 * Copyright (C) 2000 Franz Sirl.8 *9 * This file will soon be removed in favor of an uinput userspace tool.10 */11 12#include <linux/init.h>13#include <linux/proc_fs.h>14#include <linux/sysctl.h>15#include <linux/input.h>16#include <linux/module.h>17#include <linux/slab.h>18 19MODULE_DESCRIPTION("Mouse button 2+3 emulation");20MODULE_LICENSE("GPL");21 22static int mouse_emulate_buttons;23static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */24static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */25 26static struct input_dev *mac_hid_emumouse_dev;27 28static DEFINE_MUTEX(mac_hid_emumouse_mutex);29 30static int mac_hid_create_emumouse(void)31{32 static struct lock_class_key mac_hid_emumouse_dev_event_class;33 static struct lock_class_key mac_hid_emumouse_dev_mutex_class;34 int err;35 36 mac_hid_emumouse_dev = input_allocate_device();37 if (!mac_hid_emumouse_dev)38 return -ENOMEM;39 40 lockdep_set_class(&mac_hid_emumouse_dev->event_lock,41 &mac_hid_emumouse_dev_event_class);42 lockdep_set_class(&mac_hid_emumouse_dev->mutex,43 &mac_hid_emumouse_dev_mutex_class);44 45 mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";46 mac_hid_emumouse_dev->id.bustype = BUS_ADB;47 mac_hid_emumouse_dev->id.vendor = 0x0001;48 mac_hid_emumouse_dev->id.product = 0x0001;49 mac_hid_emumouse_dev->id.version = 0x0100;50 51 mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);52 mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =53 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);54 mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);55 56 err = input_register_device(mac_hid_emumouse_dev);57 if (err) {58 input_free_device(mac_hid_emumouse_dev);59 mac_hid_emumouse_dev = NULL;60 return err;61 }62 63 return 0;64}65 66static void mac_hid_destroy_emumouse(void)67{68 input_unregister_device(mac_hid_emumouse_dev);69 mac_hid_emumouse_dev = NULL;70}71 72static bool mac_hid_emumouse_filter(struct input_handle *handle,73 unsigned int type, unsigned int code,74 int value)75{76 unsigned int btn;77 78 if (type != EV_KEY)79 return false;80 81 if (code == mouse_button2_keycode)82 btn = BTN_MIDDLE;83 else if (code == mouse_button3_keycode)84 btn = BTN_RIGHT;85 else86 return false;87 88 input_report_key(mac_hid_emumouse_dev, btn, value);89 input_sync(mac_hid_emumouse_dev);90 91 return true;92}93 94static int mac_hid_emumouse_connect(struct input_handler *handler,95 struct input_dev *dev,96 const struct input_device_id *id)97{98 struct input_handle *handle;99 int error;100 101 /* Don't bind to ourselves */102 if (dev == mac_hid_emumouse_dev)103 return -ENODEV;104 105 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);106 if (!handle)107 return -ENOMEM;108 109 handle->dev = dev;110 handle->handler = handler;111 handle->name = "mac-button-emul";112 113 error = input_register_handle(handle);114 if (error) {115 printk(KERN_ERR116 "mac_hid: Failed to register button emulation handle, "117 "error %d\n", error);118 goto err_free;119 }120 121 error = input_open_device(handle);122 if (error) {123 printk(KERN_ERR124 "mac_hid: Failed to open input device, error %d\n",125 error);126 goto err_unregister;127 }128 129 return 0;130 131 err_unregister:132 input_unregister_handle(handle);133 err_free:134 kfree(handle);135 return error;136}137 138static void mac_hid_emumouse_disconnect(struct input_handle *handle)139{140 input_close_device(handle);141 input_unregister_handle(handle);142 kfree(handle);143}144 145static const struct input_device_id mac_hid_emumouse_ids[] = {146 {147 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,148 .evbit = { BIT_MASK(EV_KEY) },149 },150 { },151};152 153MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);154 155static struct input_handler mac_hid_emumouse_handler = {156 .filter = mac_hid_emumouse_filter,157 .connect = mac_hid_emumouse_connect,158 .disconnect = mac_hid_emumouse_disconnect,159 .name = "mac-button-emul",160 .id_table = mac_hid_emumouse_ids,161};162 163static int mac_hid_start_emulation(void)164{165 int err;166 167 err = mac_hid_create_emumouse();168 if (err)169 return err;170 171 err = input_register_handler(&mac_hid_emumouse_handler);172 if (err) {173 mac_hid_destroy_emumouse();174 return err;175 }176 177 return 0;178}179 180static void mac_hid_stop_emulation(void)181{182 input_unregister_handler(&mac_hid_emumouse_handler);183 mac_hid_destroy_emumouse();184}185 186static int mac_hid_toggle_emumouse(const struct ctl_table *table, int write,187 void *buffer, size_t *lenp, loff_t *ppos)188{189 int *valp = table->data;190 int old_val = *valp;191 int rc;192 193 rc = mutex_lock_killable(&mac_hid_emumouse_mutex);194 if (rc)195 return rc;196 197 rc = proc_dointvec(table, write, buffer, lenp, ppos);198 199 if (rc == 0 && write && *valp != old_val) {200 if (*valp == 1)201 rc = mac_hid_start_emulation();202 else if (*valp == 0)203 mac_hid_stop_emulation();204 else205 rc = -EINVAL;206 }207 208 /* Restore the old value in case of error */209 if (rc)210 *valp = old_val;211 212 mutex_unlock(&mac_hid_emumouse_mutex);213 214 return rc;215}216 217/* file(s) in /proc/sys/dev/mac_hid */218static struct ctl_table mac_hid_files[] = {219 {220 .procname = "mouse_button_emulation",221 .data = &mouse_emulate_buttons,222 .maxlen = sizeof(int),223 .mode = 0644,224 .proc_handler = mac_hid_toggle_emumouse,225 },226 {227 .procname = "mouse_button2_keycode",228 .data = &mouse_button2_keycode,229 .maxlen = sizeof(int),230 .mode = 0644,231 .proc_handler = proc_dointvec,232 },233 {234 .procname = "mouse_button3_keycode",235 .data = &mouse_button3_keycode,236 .maxlen = sizeof(int),237 .mode = 0644,238 .proc_handler = proc_dointvec,239 },240};241 242static struct ctl_table_header *mac_hid_sysctl_header;243 244static int __init mac_hid_init(void)245{246 mac_hid_sysctl_header = register_sysctl("dev/mac_hid", mac_hid_files);247 if (!mac_hid_sysctl_header)248 return -ENOMEM;249 250 return 0;251}252module_init(mac_hid_init);253 254static void __exit mac_hid_exit(void)255{256 unregister_sysctl_table(mac_hid_sysctl_header);257 258 if (mouse_emulate_buttons)259 mac_hid_stop_emulation();260}261module_exit(mac_hid_exit);262