1 /* 2 * drivers/macintosh/mac_hid.c 3 * 4 * HID support stuff for Macintosh computers. 5 * 6 * Copyright (C) 2000 Franz Sirl. 7 * 8 * This file will soon be removed in favor of an uinput userspace tool. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/proc_fs.h> 13 #include <linux/sysctl.h> 14 #include <linux/input.h> 15 #include <linux/module.h> 16 17 MODULE_LICENSE("GPL"); 18 19 static int mouse_emulate_buttons; 20 static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ 21 static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ 22 23 static struct input_dev *mac_hid_emumouse_dev; 24 25 static int mac_hid_create_emumouse(void) 26 { 27 static struct lock_class_key mac_hid_emumouse_dev_event_class; 28 static struct lock_class_key mac_hid_emumouse_dev_mutex_class; 29 int err; 30 31 mac_hid_emumouse_dev = input_allocate_device(); 32 if (!mac_hid_emumouse_dev) 33 return -ENOMEM; 34 35 lockdep_set_class(&mac_hid_emumouse_dev->event_lock, 36 &mac_hid_emumouse_dev_event_class); 37 lockdep_set_class(&mac_hid_emumouse_dev->mutex, 38 &mac_hid_emumouse_dev_mutex_class); 39 40 mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; 41 mac_hid_emumouse_dev->id.bustype = BUS_ADB; 42 mac_hid_emumouse_dev->id.vendor = 0x0001; 43 mac_hid_emumouse_dev->id.product = 0x0001; 44 mac_hid_emumouse_dev->id.version = 0x0100; 45 46 mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 47 mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = 48 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); 49 mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 50 51 err = input_register_device(mac_hid_emumouse_dev); 52 if (err) { 53 input_free_device(mac_hid_emumouse_dev); 54 mac_hid_emumouse_dev = NULL; 55 return err; 56 } 57 58 return 0; 59 } 60 61 static void mac_hid_destroy_emumouse(void) 62 { 63 input_unregister_device(mac_hid_emumouse_dev); 64 mac_hid_emumouse_dev = NULL; 65 } 66 67 static bool mac_hid_emumouse_filter(struct input_handle *handle, 68 unsigned int type, unsigned int code, 69 int value) 70 { 71 unsigned int btn; 72 73 if (type != EV_KEY) 74 return false; 75 76 if (code == mouse_button2_keycode) 77 btn = BTN_MIDDLE; 78 else if (code == mouse_button3_keycode) 79 btn = BTN_RIGHT; 80 else 81 return false; 82 83 input_report_key(mac_hid_emumouse_dev, btn, value); 84 input_sync(mac_hid_emumouse_dev); 85 86 return true; 87 } 88 89 static int mac_hid_emumouse_connect(struct input_handler *handler, 90 struct input_dev *dev, 91 const struct input_device_id *id) 92 { 93 struct input_handle *handle; 94 int error; 95 96 /* Don't bind to ourselves */ 97 if (dev == mac_hid_emumouse_dev) 98 return -ENODEV; 99 100 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); 101 if (!handle) 102 return -ENOMEM; 103 104 handle->dev = dev; 105 handle->handler = handler; 106 handle->name = "mac-button-emul"; 107 108 error = input_register_handle(handle); 109 if (error) { 110 printk(KERN_ERR 111 "mac_hid: Failed to register button emulation handle, " 112 "error %d\n", error); 113 goto err_free; 114 } 115 116 error = input_open_device(handle); 117 if (error) { 118 printk(KERN_ERR 119 "mac_hid: Failed to open input device, error %d\n", 120 error); 121 goto err_unregister; 122 } 123 124 return 0; 125 126 err_unregister: 127 input_unregister_handle(handle); 128 err_free: 129 kfree(handle); 130 return error; 131 } 132 133 static void mac_hid_emumouse_disconnect(struct input_handle *handle) 134 { 135 input_close_device(handle); 136 input_unregister_handle(handle); 137 kfree(handle); 138 } 139 140 static const struct input_device_id mac_hid_emumouse_ids[] = { 141 { 142 .flags = INPUT_DEVICE_ID_MATCH_EVBIT, 143 .evbit = { BIT_MASK(EV_KEY) }, 144 }, 145 { }, 146 }; 147 148 MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); 149 150 static struct input_handler mac_hid_emumouse_handler = { 151 .filter = mac_hid_emumouse_filter, 152 .connect = mac_hid_emumouse_connect, 153 .disconnect = mac_hid_emumouse_disconnect, 154 .name = "mac-button-emul", 155 .id_table = mac_hid_emumouse_ids, 156 }; 157 158 static int mac_hid_start_emulation(void) 159 { 160 int err; 161 162 err = mac_hid_create_emumouse(); 163 if (err) 164 return err; 165 166 err = input_register_handler(&mac_hid_emumouse_handler); 167 if (err) { 168 mac_hid_destroy_emumouse(); 169 return err; 170 } 171 172 return 0; 173 } 174 175 static void mac_hid_stop_emulation(void) 176 { 177 input_unregister_handler(&mac_hid_emumouse_handler); 178 mac_hid_destroy_emumouse(); 179 } 180 181 static int mac_hid_toggle_emumouse(ctl_table *table, int write, 182 void __user *buffer, size_t *lenp, 183 loff_t *ppos) 184 { 185 int *valp = table->data; 186 int old_val = *valp; 187 int rc; 188 189 rc = proc_dointvec(table, write, buffer, lenp, ppos); 190 191 if (rc == 0 && write && *valp != old_val) { 192 if (*valp == 1) 193 rc = mac_hid_start_emulation(); 194 else if (*valp == 0) 195 mac_hid_stop_emulation(); 196 else 197 rc = -EINVAL; 198 } 199 200 /* Restore the old value in case of error */ 201 if (rc) 202 *valp = old_val; 203 204 return rc; 205 } 206 207 /* file(s) in /proc/sys/dev/mac_hid */ 208 static ctl_table mac_hid_files[] = { 209 { 210 .procname = "mouse_button_emulation", 211 .data = &mouse_emulate_buttons, 212 .maxlen = sizeof(int), 213 .mode = 0644, 214 .proc_handler = mac_hid_toggle_emumouse, 215 }, 216 { 217 .procname = "mouse_button2_keycode", 218 .data = &mouse_button2_keycode, 219 .maxlen = sizeof(int), 220 .mode = 0644, 221 .proc_handler = proc_dointvec, 222 }, 223 { 224 .procname = "mouse_button3_keycode", 225 .data = &mouse_button3_keycode, 226 .maxlen = sizeof(int), 227 .mode = 0644, 228 .proc_handler = proc_dointvec, 229 }, 230 { } 231 }; 232 233 /* dir in /proc/sys/dev */ 234 static ctl_table mac_hid_dir[] = { 235 { 236 .procname = "mac_hid", 237 .maxlen = 0, 238 .mode = 0555, 239 .child = mac_hid_files, 240 }, 241 { } 242 }; 243 244 /* /proc/sys/dev itself, in case that is not there yet */ 245 static ctl_table mac_hid_root_dir[] = { 246 { 247 .procname = "dev", 248 .maxlen = 0, 249 .mode = 0555, 250 .child = mac_hid_dir, 251 }, 252 { } 253 }; 254 255 static struct ctl_table_header *mac_hid_sysctl_header; 256 257 static int __init mac_hid_init(void) 258 { 259 mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); 260 if (!mac_hid_sysctl_header) 261 return -ENOMEM; 262 263 return 0; 264 } 265 module_init(mac_hid_init); 266 267 static void __exit mac_hid_exit(void) 268 { 269 unregister_sysctl_table(mac_hid_sysctl_header); 270 271 if (mouse_emulate_buttons) 272 mac_hid_stop_emulation(); 273 } 274 module_exit(mac_hid_exit); 275