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#include <linux/slab.h> 17 18MODULE_LICENSE("GPL"); 19 20static int mouse_emulate_buttons; 21static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ 22static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ 23 24static struct input_dev *mac_hid_emumouse_dev; 25 26static int mac_hid_create_emumouse(void) 27{ 28 static struct lock_class_key mac_hid_emumouse_dev_event_class; 29 static struct lock_class_key mac_hid_emumouse_dev_mutex_class; 30 int err; 31 32 mac_hid_emumouse_dev = input_allocate_device(); 33 if (!mac_hid_emumouse_dev) 34 return -ENOMEM; 35 36 lockdep_set_class(&mac_hid_emumouse_dev->event_lock, 37 &mac_hid_emumouse_dev_event_class); 38 lockdep_set_class(&mac_hid_emumouse_dev->mutex, 39 &mac_hid_emumouse_dev_mutex_class); 40 41 mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; 42 mac_hid_emumouse_dev->id.bustype = BUS_ADB; 43 mac_hid_emumouse_dev->id.vendor = 0x0001; 44 mac_hid_emumouse_dev->id.product = 0x0001; 45 mac_hid_emumouse_dev->id.version = 0x0100; 46 47 mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 48 mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = 49 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); 50 mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 51 52 err = input_register_device(mac_hid_emumouse_dev); 53 if (err) { 54 input_free_device(mac_hid_emumouse_dev); 55 mac_hid_emumouse_dev = NULL; 56 return err; 57 } 58 59 return 0; 60} 61 62static void mac_hid_destroy_emumouse(void) 63{ 64 input_unregister_device(mac_hid_emumouse_dev); 65 mac_hid_emumouse_dev = NULL; 66} 67 68static bool mac_hid_emumouse_filter(struct input_handle *handle, 69 unsigned int type, unsigned int code, 70 int value) 71{ 72 unsigned int btn; 73 74 if (type != EV_KEY) 75 return false; 76 77 if (code == mouse_button2_keycode) 78 btn = BTN_MIDDLE; 79 else if (code == mouse_button3_keycode) 80 btn = BTN_RIGHT; 81 else 82 return false; 83 84 input_report_key(mac_hid_emumouse_dev, btn, value); 85 input_sync(mac_hid_emumouse_dev); 86 87 return true; 88} 89 90static int mac_hid_emumouse_connect(struct input_handler *handler, 91 struct input_dev *dev, 92 const struct input_device_id *id) 93{ 94 struct input_handle *handle; 95 int error; 96 97 /* Don't bind to ourselves */ 98 if (dev == mac_hid_emumouse_dev) 99 return -ENODEV; 100 101 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); 102 if (!handle) 103 return -ENOMEM; 104 105 handle->dev = dev; 106 handle->handler = handler; 107 handle->name = "mac-button-emul"; 108 109 error = input_register_handle(handle); 110 if (error) { 111 printk(KERN_ERR 112 "mac_hid: Failed to register button emulation handle, " 113 "error %d\n", error); 114 goto err_free; 115 } 116 117 error = input_open_device(handle); 118 if (error) { 119 printk(KERN_ERR 120 "mac_hid: Failed to open input device, error %d\n", 121 error); 122 goto err_unregister; 123 } 124 125 return 0; 126 127 err_unregister: 128 input_unregister_handle(handle); 129 err_free: 130 kfree(handle); 131 return error; 132} 133 134static void mac_hid_emumouse_disconnect(struct input_handle *handle) 135{ 136 input_close_device(handle); 137 input_unregister_handle(handle); 138 kfree(handle); 139} 140 141static const struct input_device_id mac_hid_emumouse_ids[] = { 142 { 143 .flags = INPUT_DEVICE_ID_MATCH_EVBIT, 144 .evbit = { BIT_MASK(EV_KEY) }, 145 }, 146 { }, 147}; 148 149MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); 150 151static struct input_handler mac_hid_emumouse_handler = { 152 .filter = mac_hid_emumouse_filter, 153 .connect = mac_hid_emumouse_connect, 154 .disconnect = mac_hid_emumouse_disconnect, 155 .name = "mac-button-emul", 156 .id_table = mac_hid_emumouse_ids, 157}; 158 159static int mac_hid_start_emulation(void) 160{ 161 int err; 162 163 err = mac_hid_create_emumouse(); 164 if (err) 165 return err; 166 167 err = input_register_handler(&mac_hid_emumouse_handler); 168 if (err) { 169 mac_hid_destroy_emumouse(); 170 return err; 171 } 172 173 return 0; 174} 175 176static void mac_hid_stop_emulation(void) 177{ 178 input_unregister_handler(&mac_hid_emumouse_handler); 179 mac_hid_destroy_emumouse(); 180} 181 182static int mac_hid_toggle_emumouse(ctl_table *table, int write, 183 void __user *buffer, size_t *lenp, 184 loff_t *ppos) 185{ 186 int *valp = table->data; 187 int old_val = *valp; 188 int rc; 189 190 rc = proc_dointvec(table, write, buffer, lenp, ppos); 191 192 if (rc == 0 && write && *valp != old_val) { 193 if (*valp == 1) 194 rc = mac_hid_start_emulation(); 195 else if (*valp == 0) 196 mac_hid_stop_emulation(); 197 else 198 rc = -EINVAL; 199 } 200 201 /* Restore the old value in case of error */ 202 if (rc) 203 *valp = old_val; 204 205 return rc; 206} 207 208/* file(s) in /proc/sys/dev/mac_hid */ 209static ctl_table mac_hid_files[] = { 210 { 211 .procname = "mouse_button_emulation", 212 .data = &mouse_emulate_buttons, 213 .maxlen = sizeof(int), 214 .mode = 0644, 215 .proc_handler = mac_hid_toggle_emumouse, 216 }, 217 { 218 .procname = "mouse_button2_keycode", 219 .data = &mouse_button2_keycode, 220 .maxlen = sizeof(int), 221 .mode = 0644, 222 .proc_handler = proc_dointvec, 223 }, 224 { 225 .procname = "mouse_button3_keycode", 226 .data = &mouse_button3_keycode, 227 .maxlen = sizeof(int), 228 .mode = 0644, 229 .proc_handler = proc_dointvec, 230 }, 231 { } 232}; 233 234/* dir in /proc/sys/dev */ 235static ctl_table mac_hid_dir[] = { 236 { 237 .procname = "mac_hid", 238 .maxlen = 0, 239 .mode = 0555, 240 .child = mac_hid_files, 241 }, 242 { } 243}; 244 245/* /proc/sys/dev itself, in case that is not there yet */ 246static ctl_table mac_hid_root_dir[] = { 247 { 248 .procname = "dev", 249 .maxlen = 0, 250 .mode = 0555, 251 .child = mac_hid_dir, 252 }, 253 { } 254}; 255 256static struct ctl_table_header *mac_hid_sysctl_header; 257 258static int __init mac_hid_init(void) 259{ 260 mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir); 261 if (!mac_hid_sysctl_header) 262 return -ENOMEM; 263 264 return 0; 265} 266module_init(mac_hid_init); 267 268static void __exit mac_hid_exit(void) 269{ 270 unregister_sysctl_table(mac_hid_sysctl_header); 271 272 if (mouse_emulate_buttons) 273 mac_hid_stop_emulation(); 274} 275module_exit(mac_hid_exit); 276