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![Christoph Hellwig](/assets/img/avatar_default.png)
Instead of having all the sysctl handlers deal with user pointers, which is rather hairy in terms of the BPF interaction, copy the input to and from userspace in common code. This also means that the strings are always NUL-terminated by the common code, making the API a little bit safer. As most handler just pass through the data to one of the common handlers a lot of the changes are mechnical. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
283 lines
6.1 KiB
C
283 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/macintosh/mac_hid.c
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*
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* HID support stuff for Macintosh computers.
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*
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* Copyright (C) 2000 Franz Sirl.
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*
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* This file will soon be removed in favor of an uinput userspace tool.
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*/
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/sysctl.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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MODULE_LICENSE("GPL");
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static int mouse_emulate_buttons;
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static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */
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static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */
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static struct input_dev *mac_hid_emumouse_dev;
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static DEFINE_MUTEX(mac_hid_emumouse_mutex);
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static int mac_hid_create_emumouse(void)
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{
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static struct lock_class_key mac_hid_emumouse_dev_event_class;
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static struct lock_class_key mac_hid_emumouse_dev_mutex_class;
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int err;
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mac_hid_emumouse_dev = input_allocate_device();
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if (!mac_hid_emumouse_dev)
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return -ENOMEM;
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lockdep_set_class(&mac_hid_emumouse_dev->event_lock,
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&mac_hid_emumouse_dev_event_class);
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lockdep_set_class(&mac_hid_emumouse_dev->mutex,
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&mac_hid_emumouse_dev_mutex_class);
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mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";
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mac_hid_emumouse_dev->id.bustype = BUS_ADB;
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mac_hid_emumouse_dev->id.vendor = 0x0001;
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mac_hid_emumouse_dev->id.product = 0x0001;
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mac_hid_emumouse_dev->id.version = 0x0100;
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mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
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mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =
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BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
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mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
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err = input_register_device(mac_hid_emumouse_dev);
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if (err) {
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input_free_device(mac_hid_emumouse_dev);
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mac_hid_emumouse_dev = NULL;
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return err;
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}
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return 0;
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}
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static void mac_hid_destroy_emumouse(void)
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{
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input_unregister_device(mac_hid_emumouse_dev);
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mac_hid_emumouse_dev = NULL;
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}
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static bool mac_hid_emumouse_filter(struct input_handle *handle,
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unsigned int type, unsigned int code,
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int value)
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{
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unsigned int btn;
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if (type != EV_KEY)
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return false;
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if (code == mouse_button2_keycode)
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btn = BTN_MIDDLE;
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else if (code == mouse_button3_keycode)
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btn = BTN_RIGHT;
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else
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return false;
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input_report_key(mac_hid_emumouse_dev, btn, value);
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input_sync(mac_hid_emumouse_dev);
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return true;
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}
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static int mac_hid_emumouse_connect(struct input_handler *handler,
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struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_handle *handle;
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int error;
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/* Don't bind to ourselves */
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if (dev == mac_hid_emumouse_dev)
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return -ENODEV;
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handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
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if (!handle)
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return -ENOMEM;
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handle->dev = dev;
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handle->handler = handler;
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handle->name = "mac-button-emul";
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error = input_register_handle(handle);
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if (error) {
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printk(KERN_ERR
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"mac_hid: Failed to register button emulation handle, "
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"error %d\n", error);
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goto err_free;
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}
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error = input_open_device(handle);
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if (error) {
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printk(KERN_ERR
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"mac_hid: Failed to open input device, error %d\n",
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error);
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goto err_unregister;
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}
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return 0;
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err_unregister:
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input_unregister_handle(handle);
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err_free:
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kfree(handle);
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return error;
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}
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static void mac_hid_emumouse_disconnect(struct input_handle *handle)
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{
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(handle);
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}
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static const struct input_device_id mac_hid_emumouse_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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},
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{ },
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};
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MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);
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static struct input_handler mac_hid_emumouse_handler = {
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.filter = mac_hid_emumouse_filter,
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.connect = mac_hid_emumouse_connect,
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.disconnect = mac_hid_emumouse_disconnect,
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.name = "mac-button-emul",
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.id_table = mac_hid_emumouse_ids,
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};
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static int mac_hid_start_emulation(void)
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{
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int err;
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err = mac_hid_create_emumouse();
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if (err)
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return err;
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err = input_register_handler(&mac_hid_emumouse_handler);
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if (err) {
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mac_hid_destroy_emumouse();
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return err;
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}
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return 0;
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}
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static void mac_hid_stop_emulation(void)
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{
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input_unregister_handler(&mac_hid_emumouse_handler);
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mac_hid_destroy_emumouse();
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}
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static int mac_hid_toggle_emumouse(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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int *valp = table->data;
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int old_val = *valp;
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int rc;
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rc = mutex_lock_killable(&mac_hid_emumouse_mutex);
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if (rc)
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return rc;
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rc = proc_dointvec(table, write, buffer, lenp, ppos);
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if (rc == 0 && write && *valp != old_val) {
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if (*valp == 1)
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rc = mac_hid_start_emulation();
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else if (*valp == 0)
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mac_hid_stop_emulation();
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else
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rc = -EINVAL;
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}
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/* Restore the old value in case of error */
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if (rc)
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*valp = old_val;
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mutex_unlock(&mac_hid_emumouse_mutex);
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return rc;
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}
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/* file(s) in /proc/sys/dev/mac_hid */
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static struct ctl_table mac_hid_files[] = {
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{
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.procname = "mouse_button_emulation",
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.data = &mouse_emulate_buttons,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = mac_hid_toggle_emumouse,
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},
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{
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.procname = "mouse_button2_keycode",
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.data = &mouse_button2_keycode,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "mouse_button3_keycode",
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.data = &mouse_button3_keycode,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ }
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};
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/* dir in /proc/sys/dev */
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static struct ctl_table mac_hid_dir[] = {
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{
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.procname = "mac_hid",
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.maxlen = 0,
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.mode = 0555,
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.child = mac_hid_files,
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},
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{ }
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};
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/* /proc/sys/dev itself, in case that is not there yet */
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static struct ctl_table mac_hid_root_dir[] = {
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{
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.procname = "dev",
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.maxlen = 0,
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.mode = 0555,
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.child = mac_hid_dir,
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},
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{ }
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};
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static struct ctl_table_header *mac_hid_sysctl_header;
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static int __init mac_hid_init(void)
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{
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mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
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if (!mac_hid_sysctl_header)
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return -ENOMEM;
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return 0;
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}
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module_init(mac_hid_init);
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static void __exit mac_hid_exit(void)
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{
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unregister_sysctl_table(mac_hid_sysctl_header);
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if (mouse_emulate_buttons)
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mac_hid_stop_emulation();
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}
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module_exit(mac_hid_exit);
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