1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/macintosh/mac_hid.c 4 * 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 19 MODULE_LICENSE("GPL"); 20 21 static int mouse_emulate_buttons; 22 static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ 23 static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ 24 25 static struct input_dev *mac_hid_emumouse_dev; 26 27 static DEFINE_MUTEX(mac_hid_emumouse_mutex); 28 29 static int mac_hid_create_emumouse(void) 30 { 31 static struct lock_class_key mac_hid_emumouse_dev_event_class; 32 static struct lock_class_key mac_hid_emumouse_dev_mutex_class; 33 int err; 34 35 mac_hid_emumouse_dev = input_allocate_device(); 36 if (!mac_hid_emumouse_dev) 37 return -ENOMEM; 38 39 lockdep_set_class(&mac_hid_emumouse_dev->event_lock, 40 &mac_hid_emumouse_dev_event_class); 41 lockdep_set_class(&mac_hid_emumouse_dev->mutex, 42 &mac_hid_emumouse_dev_mutex_class); 43 44 mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; 45 mac_hid_emumouse_dev->id.bustype = BUS_ADB; 46 mac_hid_emumouse_dev->id.vendor = 0x0001; 47 mac_hid_emumouse_dev->id.product = 0x0001; 48 mac_hid_emumouse_dev->id.version = 0x0100; 49 50 mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 51 mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = 52 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); 53 mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 54 55 err = input_register_device(mac_hid_emumouse_dev); 56 if (err) { 57 input_free_device(mac_hid_emumouse_dev); 58 mac_hid_emumouse_dev = NULL; 59 return err; 60 } 61 62 return 0; 63 } 64 65 static void mac_hid_destroy_emumouse(void) 66 { 67 input_unregister_device(mac_hid_emumouse_dev); 68 mac_hid_emumouse_dev = NULL; 69 } 70 71 static bool mac_hid_emumouse_filter(struct input_handle *handle, 72 unsigned int type, unsigned int code, 73 int value) 74 { 75 unsigned int btn; 76 77 if (type != EV_KEY) 78 return false; 79 80 if (code == mouse_button2_keycode) 81 btn = BTN_MIDDLE; 82 else if (code == mouse_button3_keycode) 83 btn = BTN_RIGHT; 84 else 85 return false; 86 87 input_report_key(mac_hid_emumouse_dev, btn, value); 88 input_sync(mac_hid_emumouse_dev); 89 90 return true; 91 } 92 93 static int mac_hid_emumouse_connect(struct input_handler *handler, 94 struct input_dev *dev, 95 const struct input_device_id *id) 96 { 97 struct input_handle *handle; 98 int error; 99 100 /* Don't bind to ourselves */ 101 if (dev == mac_hid_emumouse_dev) 102 return -ENODEV; 103 104 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); 105 if (!handle) 106 return -ENOMEM; 107 108 handle->dev = dev; 109 handle->handler = handler; 110 handle->name = "mac-button-emul"; 111 112 error = input_register_handle(handle); 113 if (error) { 114 printk(KERN_ERR 115 "mac_hid: Failed to register button emulation handle, " 116 "error %d\n", error); 117 goto err_free; 118 } 119 120 error = input_open_device(handle); 121 if (error) { 122 printk(KERN_ERR 123 "mac_hid: Failed to open input device, error %d\n", 124 error); 125 goto err_unregister; 126 } 127 128 return 0; 129 130 err_unregister: 131 input_unregister_handle(handle); 132 err_free: 133 kfree(handle); 134 return error; 135 } 136 137 static void mac_hid_emumouse_disconnect(struct input_handle *handle) 138 { 139 input_close_device(handle); 140 input_unregister_handle(handle); 141 kfree(handle); 142 } 143 144 static const struct input_device_id mac_hid_emumouse_ids[] = { 145 { 146 .flags = INPUT_DEVICE_ID_MATCH_EVBIT, 147 .evbit = { BIT_MASK(EV_KEY) }, 148 }, 149 { }, 150 }; 151 152 MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); 153 154 static struct input_handler mac_hid_emumouse_handler = { 155 .filter = mac_hid_emumouse_filter, 156 .connect = mac_hid_emumouse_connect, 157 .disconnect = mac_hid_emumouse_disconnect, 158 .name = "mac-button-emul", 159 .id_table = mac_hid_emumouse_ids, 160 }; 161 162 static int mac_hid_start_emulation(void) 163 { 164 int err; 165 166 err = mac_hid_create_emumouse(); 167 if (err) 168 return err; 169 170 err = input_register_handler(&mac_hid_emumouse_handler); 171 if (err) { 172 mac_hid_destroy_emumouse(); 173 return err; 174 } 175 176 return 0; 177 } 178 179 static void mac_hid_stop_emulation(void) 180 { 181 input_unregister_handler(&mac_hid_emumouse_handler); 182 mac_hid_destroy_emumouse(); 183 } 184 185 static int mac_hid_toggle_emumouse(struct ctl_table *table, int write, 186 void *buffer, size_t *lenp, loff_t *ppos) 187 { 188 int *valp = table->data; 189 int old_val = *valp; 190 int rc; 191 192 rc = mutex_lock_killable(&mac_hid_emumouse_mutex); 193 if (rc) 194 return rc; 195 196 rc = proc_dointvec(table, write, buffer, lenp, ppos); 197 198 if (rc == 0 && write && *valp != old_val) { 199 if (*valp == 1) 200 rc = mac_hid_start_emulation(); 201 else if (*valp == 0) 202 mac_hid_stop_emulation(); 203 else 204 rc = -EINVAL; 205 } 206 207 /* Restore the old value in case of error */ 208 if (rc) 209 *valp = old_val; 210 211 mutex_unlock(&mac_hid_emumouse_mutex); 212 213 return rc; 214 } 215 216 /* file(s) in /proc/sys/dev/mac_hid */ 217 static struct ctl_table mac_hid_files[] = { 218 { 219 .procname = "mouse_button_emulation", 220 .data = &mouse_emulate_buttons, 221 .maxlen = sizeof(int), 222 .mode = 0644, 223 .proc_handler = mac_hid_toggle_emumouse, 224 }, 225 { 226 .procname = "mouse_button2_keycode", 227 .data = &mouse_button2_keycode, 228 .maxlen = sizeof(int), 229 .mode = 0644, 230 .proc_handler = proc_dointvec, 231 }, 232 { 233 .procname = "mouse_button3_keycode", 234 .data = &mouse_button3_keycode, 235 .maxlen = sizeof(int), 236 .mode = 0644, 237 .proc_handler = proc_dointvec, 238 }, 239 { } 240 }; 241 242 /* dir in /proc/sys/dev */ 243 static struct ctl_table mac_hid_dir[] = { 244 { 245 .procname = "mac_hid", 246 .maxlen = 0, 247 .mode = 0555, 248 .child = mac_hid_files, 249 }, 250 { } 251 }; 252 253 /* /proc/sys/dev itself, in case that is not there yet */ 254 static struct ctl_table mac_hid_root_dir[] = { 255 { 256 .procname = "dev", 257 .maxlen = 0, 258 .mode = 0555, 259 .child = mac_hid_dir, 260 }, 261 { } 262 }; 263 264 static struct ctl_table_header *mac_hid_sysctl_header; 265 266 static int __init mac_hid_init(void) 267 { 268 mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); 269 if (!mac_hid_sysctl_header) 270 return -ENOMEM; 271 272 return 0; 273 } 274 module_init(mac_hid_init); 275 276 static void __exit mac_hid_exit(void) 277 { 278 unregister_sysctl_table(mac_hid_sysctl_header); 279 280 if (mouse_emulate_buttons) 281 mac_hid_stop_emulation(); 282 } 283 module_exit(mac_hid_exit); 284