linux/drivers/macintosh/mac_hid.c
<<
>>
Prefs
   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 DEFINE_MUTEX(mac_hid_emumouse_mutex);
  27
  28static int mac_hid_create_emumouse(void)
  29{
  30        static struct lock_class_key mac_hid_emumouse_dev_event_class;
  31        static struct lock_class_key mac_hid_emumouse_dev_mutex_class;
  32        int err;
  33
  34        mac_hid_emumouse_dev = input_allocate_device();
  35        if (!mac_hid_emumouse_dev)
  36                return -ENOMEM;
  37
  38        lockdep_set_class(&mac_hid_emumouse_dev->event_lock,
  39                          &mac_hid_emumouse_dev_event_class);
  40        lockdep_set_class(&mac_hid_emumouse_dev->mutex,
  41                          &mac_hid_emumouse_dev_mutex_class);
  42
  43        mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";
  44        mac_hid_emumouse_dev->id.bustype = BUS_ADB;
  45        mac_hid_emumouse_dev->id.vendor = 0x0001;
  46        mac_hid_emumouse_dev->id.product = 0x0001;
  47        mac_hid_emumouse_dev->id.version = 0x0100;
  48
  49        mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
  50        mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =
  51                BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
  52        mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
  53
  54        err = input_register_device(mac_hid_emumouse_dev);
  55        if (err) {
  56                input_free_device(mac_hid_emumouse_dev);
  57                mac_hid_emumouse_dev = NULL;
  58                return err;
  59        }
  60
  61        return 0;
  62}
  63
  64static void mac_hid_destroy_emumouse(void)
  65{
  66        input_unregister_device(mac_hid_emumouse_dev);
  67        mac_hid_emumouse_dev = NULL;
  68}
  69
  70static bool mac_hid_emumouse_filter(struct input_handle *handle,
  71                                    unsigned int type, unsigned int code,
  72                                    int value)
  73{
  74        unsigned int btn;
  75
  76        if (type != EV_KEY)
  77                return false;
  78
  79        if (code == mouse_button2_keycode)
  80                btn = BTN_MIDDLE;
  81        else if (code == mouse_button3_keycode)
  82                btn = BTN_RIGHT;
  83        else
  84                return false;
  85
  86        input_report_key(mac_hid_emumouse_dev, btn, value);
  87        input_sync(mac_hid_emumouse_dev);
  88
  89        return true;
  90}
  91
  92static int mac_hid_emumouse_connect(struct input_handler *handler,
  93                                    struct input_dev *dev,
  94                                    const struct input_device_id *id)
  95{
  96        struct input_handle *handle;
  97        int error;
  98
  99        /* Don't bind to ourselves */
 100        if (dev == mac_hid_emumouse_dev)
 101                return -ENODEV;
 102
 103        handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
 104        if (!handle)
 105                return -ENOMEM;
 106
 107        handle->dev = dev;
 108        handle->handler = handler;
 109        handle->name = "mac-button-emul";
 110
 111        error = input_register_handle(handle);
 112        if (error) {
 113                printk(KERN_ERR
 114                        "mac_hid: Failed to register button emulation handle, "
 115                        "error %d\n", error);
 116                goto err_free;
 117        }
 118
 119        error = input_open_device(handle);
 120        if (error) {
 121                printk(KERN_ERR
 122                        "mac_hid: Failed to open input device, error %d\n",
 123                        error);
 124                goto err_unregister;
 125        }
 126
 127        return 0;
 128
 129 err_unregister:
 130        input_unregister_handle(handle);
 131 err_free:
 132        kfree(handle);
 133        return error;
 134}
 135
 136static void mac_hid_emumouse_disconnect(struct input_handle *handle)
 137{
 138        input_close_device(handle);
 139        input_unregister_handle(handle);
 140        kfree(handle);
 141}
 142
 143static const struct input_device_id mac_hid_emumouse_ids[] = {
 144        {
 145                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
 146                .evbit = { BIT_MASK(EV_KEY) },
 147        },
 148        { },
 149};
 150
 151MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);
 152
 153static struct input_handler mac_hid_emumouse_handler = {
 154        .filter         = mac_hid_emumouse_filter,
 155        .connect        = mac_hid_emumouse_connect,
 156        .disconnect     = mac_hid_emumouse_disconnect,
 157        .name           = "mac-button-emul",
 158        .id_table       = mac_hid_emumouse_ids,
 159};
 160
 161static int mac_hid_start_emulation(void)
 162{
 163        int err;
 164
 165        err = mac_hid_create_emumouse();
 166        if (err)
 167                return err;
 168
 169        err = input_register_handler(&mac_hid_emumouse_handler);
 170        if (err) {
 171                mac_hid_destroy_emumouse();
 172                return err;
 173        }
 174
 175        return 0;
 176}
 177
 178static void mac_hid_stop_emulation(void)
 179{
 180        input_unregister_handler(&mac_hid_emumouse_handler);
 181        mac_hid_destroy_emumouse();
 182}
 183
 184static int mac_hid_toggle_emumouse(ctl_table *table, int write,
 185                                   void __user *buffer, size_t *lenp,
 186                                   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 */
 217static 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 */
 243static 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 */
 254static 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
 264static struct ctl_table_header *mac_hid_sysctl_header;
 265
 266static 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}
 274module_init(mac_hid_init);
 275
 276static 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}
 283module_exit(mac_hid_exit);
 284
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.