![Dmitry Torokhov](/assets/img/avatar_default.png)
Hopefully this will stop people from using input_free_device() incorrectly. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
1186 lines
29 KiB
C
1186 lines
29 KiB
C
/*
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* The input core
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*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/major.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
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MODULE_DESCRIPTION("Input core");
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MODULE_LICENSE("GPL");
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#define INPUT_DEVICES 256
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static LIST_HEAD(input_dev_list);
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static LIST_HEAD(input_handler_list);
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static struct input_handler *input_table[8];
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/**
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* input_event() - report new input event
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* @dev: device that generated the event
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* @type: type of the event
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* @code: event code
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* @value: value of the event
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*
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* This function should be used by drivers implementing various input devices
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* See also input_inject_event()
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*/
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void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
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{
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struct input_handle *handle;
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if (type > EV_MAX || !test_bit(type, dev->evbit))
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return;
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add_input_randomness(type, code, value);
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switch (type) {
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case EV_SYN:
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switch (code) {
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case SYN_CONFIG:
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if (dev->event)
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dev->event(dev, type, code, value);
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break;
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case SYN_REPORT:
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if (dev->sync)
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return;
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dev->sync = 1;
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break;
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}
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break;
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case EV_KEY:
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if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
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return;
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if (value == 2)
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break;
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change_bit(code, dev->key);
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if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
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dev->repeat_key = code;
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mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
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}
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break;
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case EV_SW:
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if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
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return;
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change_bit(code, dev->sw);
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break;
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case EV_ABS:
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if (code > ABS_MAX || !test_bit(code, dev->absbit))
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return;
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if (dev->absfuzz[code]) {
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if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
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(value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
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return;
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if ((value > dev->abs[code] - dev->absfuzz[code]) &&
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(value < dev->abs[code] + dev->absfuzz[code]))
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value = (dev->abs[code] * 3 + value) >> 2;
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if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
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(value < dev->abs[code] + (dev->absfuzz[code] << 1)))
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value = (dev->abs[code] + value) >> 1;
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}
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if (dev->abs[code] == value)
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return;
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dev->abs[code] = value;
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break;
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case EV_REL:
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if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
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return;
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break;
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case EV_MSC:
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if (code > MSC_MAX || !test_bit(code, dev->mscbit))
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return;
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if (dev->event)
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dev->event(dev, type, code, value);
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break;
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case EV_LED:
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if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
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return;
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change_bit(code, dev->led);
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if (dev->event)
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dev->event(dev, type, code, value);
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break;
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case EV_SND:
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if (code > SND_MAX || !test_bit(code, dev->sndbit))
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return;
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if (!!test_bit(code, dev->snd) != !!value)
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change_bit(code, dev->snd);
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if (dev->event)
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dev->event(dev, type, code, value);
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break;
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case EV_REP:
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if (code > REP_MAX || value < 0 || dev->rep[code] == value)
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return;
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dev->rep[code] = value;
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if (dev->event)
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dev->event(dev, type, code, value);
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break;
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case EV_FF:
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if (value < 0)
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return;
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if (dev->event)
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dev->event(dev, type, code, value);
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break;
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}
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if (type != EV_SYN)
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dev->sync = 0;
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if (dev->grab)
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dev->grab->handler->event(dev->grab, type, code, value);
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else
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list_for_each_entry(handle, &dev->h_list, d_node)
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if (handle->open)
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handle->handler->event(handle, type, code, value);
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}
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EXPORT_SYMBOL(input_event);
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/**
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* input_inject_event() - send input event from input handler
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* @handle: input handle to send event through
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* @type: type of the event
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* @code: event code
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* @value: value of the event
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*
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* Similar to input_event() but will ignore event if device is "grabbed" and handle
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* injecting event is not the one that owns the device.
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*/
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void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
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{
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if (!handle->dev->grab || handle->dev->grab == handle)
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input_event(handle->dev, type, code, value);
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}
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EXPORT_SYMBOL(input_inject_event);
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static void input_repeat_key(unsigned long data)
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{
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struct input_dev *dev = (void *) data;
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if (!test_bit(dev->repeat_key, dev->key))
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return;
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input_event(dev, EV_KEY, dev->repeat_key, 2);
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input_sync(dev);
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if (dev->rep[REP_PERIOD])
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mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
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}
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int input_grab_device(struct input_handle *handle)
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{
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if (handle->dev->grab)
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return -EBUSY;
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handle->dev->grab = handle;
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return 0;
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}
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EXPORT_SYMBOL(input_grab_device);
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void input_release_device(struct input_handle *handle)
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{
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struct input_dev *dev = handle->dev;
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if (dev->grab == handle) {
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dev->grab = NULL;
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list_for_each_entry(handle, &dev->h_list, d_node)
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if (handle->handler->start)
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handle->handler->start(handle);
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}
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}
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EXPORT_SYMBOL(input_release_device);
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int input_open_device(struct input_handle *handle)
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{
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struct input_dev *dev = handle->dev;
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int err;
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err = mutex_lock_interruptible(&dev->mutex);
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if (err)
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return err;
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handle->open++;
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if (!dev->users++ && dev->open)
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err = dev->open(dev);
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if (err)
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handle->open--;
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mutex_unlock(&dev->mutex);
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return err;
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}
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EXPORT_SYMBOL(input_open_device);
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int input_flush_device(struct input_handle* handle, struct file* file)
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{
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if (handle->dev->flush)
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return handle->dev->flush(handle->dev, file);
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return 0;
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}
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EXPORT_SYMBOL(input_flush_device);
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void input_close_device(struct input_handle *handle)
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{
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struct input_dev *dev = handle->dev;
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input_release_device(handle);
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mutex_lock(&dev->mutex);
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if (!--dev->users && dev->close)
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dev->close(dev);
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handle->open--;
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mutex_unlock(&dev->mutex);
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}
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EXPORT_SYMBOL(input_close_device);
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static void input_link_handle(struct input_handle *handle)
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{
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list_add_tail(&handle->d_node, &handle->dev->h_list);
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list_add_tail(&handle->h_node, &handle->handler->h_list);
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}
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#define MATCH_BIT(bit, max) \
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for (i = 0; i < NBITS(max); i++) \
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if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
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break; \
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if (i != NBITS(max)) \
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continue;
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static const struct input_device_id *input_match_device(const struct input_device_id *id,
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struct input_dev *dev)
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{
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int i;
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for (; id->flags || id->driver_info; id++) {
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if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
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if (id->bustype != dev->id.bustype)
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continue;
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if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
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if (id->vendor != dev->id.vendor)
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continue;
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if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
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if (id->product != dev->id.product)
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continue;
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if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
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if (id->version != dev->id.version)
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continue;
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MATCH_BIT(evbit, EV_MAX);
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MATCH_BIT(keybit, KEY_MAX);
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MATCH_BIT(relbit, REL_MAX);
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MATCH_BIT(absbit, ABS_MAX);
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MATCH_BIT(mscbit, MSC_MAX);
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MATCH_BIT(ledbit, LED_MAX);
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MATCH_BIT(sndbit, SND_MAX);
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MATCH_BIT(ffbit, FF_MAX);
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MATCH_BIT(swbit, SW_MAX);
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return id;
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}
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return NULL;
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}
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#ifdef CONFIG_PROC_FS
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static struct proc_dir_entry *proc_bus_input_dir;
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static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
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static int input_devices_state;
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static inline void input_wakeup_procfs_readers(void)
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{
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input_devices_state++;
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wake_up(&input_devices_poll_wait);
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}
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static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
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{
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int state = input_devices_state;
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poll_wait(file, &input_devices_poll_wait, wait);
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if (state != input_devices_state)
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return POLLIN | POLLRDNORM;
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return 0;
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}
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static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
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{
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struct list_head *node;
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loff_t i = 0;
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list_for_each(node, list)
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if (i++ == *pos)
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return node;
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return NULL;
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}
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static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
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{
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if (element->next == list)
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return NULL;
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++(*pos);
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return element->next;
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}
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static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
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{
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/* acquire lock here ... Yes, we do need locking, I knowi, I know... */
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return list_get_nth_element(&input_dev_list, pos);
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}
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static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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return list_get_next_element(&input_dev_list, v, pos);
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}
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static void input_devices_seq_stop(struct seq_file *seq, void *v)
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{
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/* release lock here */
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}
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static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
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unsigned long *bitmap, int max)
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{
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int i;
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for (i = NBITS(max) - 1; i > 0; i--)
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if (bitmap[i])
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break;
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seq_printf(seq, "B: %s=", name);
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for (; i >= 0; i--)
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seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
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seq_putc(seq, '\n');
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}
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static int input_devices_seq_show(struct seq_file *seq, void *v)
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{
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struct input_dev *dev = container_of(v, struct input_dev, node);
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const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
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struct input_handle *handle;
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seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
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dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
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seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
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seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
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seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
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seq_printf(seq, "H: Handlers=");
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list_for_each_entry(handle, &dev->h_list, d_node)
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seq_printf(seq, "%s ", handle->name);
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seq_putc(seq, '\n');
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input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
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if (test_bit(EV_KEY, dev->evbit))
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input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
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if (test_bit(EV_REL, dev->evbit))
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input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
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if (test_bit(EV_ABS, dev->evbit))
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input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
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if (test_bit(EV_MSC, dev->evbit))
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input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
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if (test_bit(EV_LED, dev->evbit))
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input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
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if (test_bit(EV_SND, dev->evbit))
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input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
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if (test_bit(EV_FF, dev->evbit))
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input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
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if (test_bit(EV_SW, dev->evbit))
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input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
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seq_putc(seq, '\n');
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kfree(path);
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return 0;
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}
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static struct seq_operations input_devices_seq_ops = {
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.start = input_devices_seq_start,
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.next = input_devices_seq_next,
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.stop = input_devices_seq_stop,
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.show = input_devices_seq_show,
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};
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static int input_proc_devices_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &input_devices_seq_ops);
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}
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static struct file_operations input_devices_fileops = {
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.owner = THIS_MODULE,
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.open = input_proc_devices_open,
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.poll = input_proc_devices_poll,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
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{
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/* acquire lock here ... Yes, we do need locking, I knowi, I know... */
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seq->private = (void *)(unsigned long)*pos;
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return list_get_nth_element(&input_handler_list, pos);
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}
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static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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seq->private = (void *)(unsigned long)(*pos + 1);
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return list_get_next_element(&input_handler_list, v, pos);
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}
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static void input_handlers_seq_stop(struct seq_file *seq, void *v)
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{
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/* release lock here */
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}
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static int input_handlers_seq_show(struct seq_file *seq, void *v)
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{
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struct input_handler *handler = container_of(v, struct input_handler, node);
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seq_printf(seq, "N: Number=%ld Name=%s",
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(unsigned long)seq->private, handler->name);
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if (handler->fops)
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seq_printf(seq, " Minor=%d", handler->minor);
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seq_putc(seq, '\n');
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return 0;
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}
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static struct seq_operations input_handlers_seq_ops = {
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.start = input_handlers_seq_start,
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.next = input_handlers_seq_next,
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.stop = input_handlers_seq_stop,
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.show = input_handlers_seq_show,
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};
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static int input_proc_handlers_open(struct inode *inode, struct file *file)
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{
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|
return seq_open(file, &input_handlers_seq_ops);
|
|
}
|
|
|
|
static struct file_operations input_handlers_fileops = {
|
|
.owner = THIS_MODULE,
|
|
.open = input_proc_handlers_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int __init input_proc_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
proc_bus_input_dir = proc_mkdir("input", proc_bus);
|
|
if (!proc_bus_input_dir)
|
|
return -ENOMEM;
|
|
|
|
proc_bus_input_dir->owner = THIS_MODULE;
|
|
|
|
entry = create_proc_entry("devices", 0, proc_bus_input_dir);
|
|
if (!entry)
|
|
goto fail1;
|
|
|
|
entry->owner = THIS_MODULE;
|
|
entry->proc_fops = &input_devices_fileops;
|
|
|
|
entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
|
|
if (!entry)
|
|
goto fail2;
|
|
|
|
entry->owner = THIS_MODULE;
|
|
entry->proc_fops = &input_handlers_fileops;
|
|
|
|
return 0;
|
|
|
|
fail2: remove_proc_entry("devices", proc_bus_input_dir);
|
|
fail1: remove_proc_entry("input", proc_bus);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void input_proc_exit(void)
|
|
{
|
|
remove_proc_entry("devices", proc_bus_input_dir);
|
|
remove_proc_entry("handlers", proc_bus_input_dir);
|
|
remove_proc_entry("input", proc_bus);
|
|
}
|
|
|
|
#else /* !CONFIG_PROC_FS */
|
|
static inline void input_wakeup_procfs_readers(void) { }
|
|
static inline int input_proc_init(void) { return 0; }
|
|
static inline void input_proc_exit(void) { }
|
|
#endif
|
|
|
|
#define INPUT_DEV_STRING_ATTR_SHOW(name) \
|
|
static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
|
|
{ \
|
|
struct input_dev *input_dev = to_input_dev(dev); \
|
|
int retval; \
|
|
\
|
|
retval = mutex_lock_interruptible(&input_dev->mutex); \
|
|
if (retval) \
|
|
return retval; \
|
|
\
|
|
retval = scnprintf(buf, PAGE_SIZE, \
|
|
"%s\n", input_dev->name ? input_dev->name : ""); \
|
|
\
|
|
mutex_unlock(&input_dev->mutex); \
|
|
\
|
|
return retval; \
|
|
} \
|
|
static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
|
|
|
|
INPUT_DEV_STRING_ATTR_SHOW(name);
|
|
INPUT_DEV_STRING_ATTR_SHOW(phys);
|
|
INPUT_DEV_STRING_ATTR_SHOW(uniq);
|
|
|
|
static int input_print_modalias_bits(char *buf, int size,
|
|
char name, unsigned long *bm,
|
|
unsigned int min_bit, unsigned int max_bit)
|
|
{
|
|
int len = 0, i;
|
|
|
|
len += snprintf(buf, max(size, 0), "%c", name);
|
|
for (i = min_bit; i < max_bit; i++)
|
|
if (bm[LONG(i)] & BIT(i))
|
|
len += snprintf(buf + len, max(size - len, 0), "%X,", i);
|
|
return len;
|
|
}
|
|
|
|
static int input_print_modalias(char *buf, int size, struct input_dev *id,
|
|
int add_cr)
|
|
{
|
|
int len;
|
|
|
|
len = snprintf(buf, max(size, 0),
|
|
"input:b%04Xv%04Xp%04Xe%04X-",
|
|
id->id.bustype, id->id.vendor,
|
|
id->id.product, id->id.version);
|
|
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'e', id->evbit, 0, EV_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'r', id->relbit, 0, REL_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'a', id->absbit, 0, ABS_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'm', id->mscbit, 0, MSC_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'l', id->ledbit, 0, LED_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
's', id->sndbit, 0, SND_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'f', id->ffbit, 0, FF_MAX);
|
|
len += input_print_modalias_bits(buf + len, size - len,
|
|
'w', id->swbit, 0, SW_MAX);
|
|
|
|
if (add_cr)
|
|
len += snprintf(buf + len, max(size - len, 0), "\n");
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
|
|
{
|
|
struct input_dev *id = to_input_dev(dev);
|
|
ssize_t len;
|
|
|
|
len = input_print_modalias(buf, PAGE_SIZE, id, 1);
|
|
|
|
return min_t(int, len, PAGE_SIZE);
|
|
}
|
|
static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
|
|
|
|
static struct attribute *input_dev_attrs[] = {
|
|
&class_device_attr_name.attr,
|
|
&class_device_attr_phys.attr,
|
|
&class_device_attr_uniq.attr,
|
|
&class_device_attr_modalias.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group input_dev_attr_group = {
|
|
.attrs = input_dev_attrs,
|
|
};
|
|
|
|
#define INPUT_DEV_ID_ATTR(name) \
|
|
static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
|
|
{ \
|
|
struct input_dev *input_dev = to_input_dev(dev); \
|
|
return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
|
|
} \
|
|
static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
|
|
|
|
INPUT_DEV_ID_ATTR(bustype);
|
|
INPUT_DEV_ID_ATTR(vendor);
|
|
INPUT_DEV_ID_ATTR(product);
|
|
INPUT_DEV_ID_ATTR(version);
|
|
|
|
static struct attribute *input_dev_id_attrs[] = {
|
|
&class_device_attr_bustype.attr,
|
|
&class_device_attr_vendor.attr,
|
|
&class_device_attr_product.attr,
|
|
&class_device_attr_version.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group input_dev_id_attr_group = {
|
|
.name = "id",
|
|
.attrs = input_dev_id_attrs,
|
|
};
|
|
|
|
static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
|
|
int max, int add_cr)
|
|
{
|
|
int i;
|
|
int len = 0;
|
|
|
|
for (i = NBITS(max) - 1; i > 0; i--)
|
|
if (bitmap[i])
|
|
break;
|
|
|
|
for (; i >= 0; i--)
|
|
len += snprintf(buf + len, max(buf_size - len, 0),
|
|
"%lx%s", bitmap[i], i > 0 ? " " : "");
|
|
|
|
if (add_cr)
|
|
len += snprintf(buf + len, max(buf_size - len, 0), "\n");
|
|
|
|
return len;
|
|
}
|
|
|
|
#define INPUT_DEV_CAP_ATTR(ev, bm) \
|
|
static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
|
|
{ \
|
|
struct input_dev *input_dev = to_input_dev(dev); \
|
|
int len = input_print_bitmap(buf, PAGE_SIZE, \
|
|
input_dev->bm##bit, ev##_MAX, 1); \
|
|
return min_t(int, len, PAGE_SIZE); \
|
|
} \
|
|
static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
|
|
|
|
INPUT_DEV_CAP_ATTR(EV, ev);
|
|
INPUT_DEV_CAP_ATTR(KEY, key);
|
|
INPUT_DEV_CAP_ATTR(REL, rel);
|
|
INPUT_DEV_CAP_ATTR(ABS, abs);
|
|
INPUT_DEV_CAP_ATTR(MSC, msc);
|
|
INPUT_DEV_CAP_ATTR(LED, led);
|
|
INPUT_DEV_CAP_ATTR(SND, snd);
|
|
INPUT_DEV_CAP_ATTR(FF, ff);
|
|
INPUT_DEV_CAP_ATTR(SW, sw);
|
|
|
|
static struct attribute *input_dev_caps_attrs[] = {
|
|
&class_device_attr_ev.attr,
|
|
&class_device_attr_key.attr,
|
|
&class_device_attr_rel.attr,
|
|
&class_device_attr_abs.attr,
|
|
&class_device_attr_msc.attr,
|
|
&class_device_attr_led.attr,
|
|
&class_device_attr_snd.attr,
|
|
&class_device_attr_ff.attr,
|
|
&class_device_attr_sw.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group input_dev_caps_attr_group = {
|
|
.name = "capabilities",
|
|
.attrs = input_dev_caps_attrs,
|
|
};
|
|
|
|
static void input_dev_release(struct class_device *class_dev)
|
|
{
|
|
struct input_dev *dev = to_input_dev(class_dev);
|
|
|
|
input_ff_destroy(dev);
|
|
kfree(dev);
|
|
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
/*
|
|
* Input uevent interface - loading event handlers based on
|
|
* device bitfields.
|
|
*/
|
|
static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
|
|
char *buffer, int buffer_size, int *cur_len,
|
|
const char *name, unsigned long *bitmap, int max)
|
|
{
|
|
if (*cur_index >= num_envp - 1)
|
|
return -ENOMEM;
|
|
|
|
envp[*cur_index] = buffer + *cur_len;
|
|
|
|
*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
|
|
if (*cur_len >= buffer_size)
|
|
return -ENOMEM;
|
|
|
|
*cur_len += input_print_bitmap(buffer + *cur_len,
|
|
max(buffer_size - *cur_len, 0),
|
|
bitmap, max, 0) + 1;
|
|
if (*cur_len > buffer_size)
|
|
return -ENOMEM;
|
|
|
|
(*cur_index)++;
|
|
return 0;
|
|
}
|
|
|
|
static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
|
|
char *buffer, int buffer_size, int *cur_len,
|
|
struct input_dev *dev)
|
|
{
|
|
if (*cur_index >= num_envp - 1)
|
|
return -ENOMEM;
|
|
|
|
envp[*cur_index] = buffer + *cur_len;
|
|
|
|
*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
|
|
"MODALIAS=");
|
|
if (*cur_len >= buffer_size)
|
|
return -ENOMEM;
|
|
|
|
*cur_len += input_print_modalias(buffer + *cur_len,
|
|
max(buffer_size - *cur_len, 0),
|
|
dev, 0) + 1;
|
|
if (*cur_len > buffer_size)
|
|
return -ENOMEM;
|
|
|
|
(*cur_index)++;
|
|
return 0;
|
|
}
|
|
|
|
#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
|
|
do { \
|
|
int err = add_uevent_var(envp, num_envp, &i, \
|
|
buffer, buffer_size, &len, \
|
|
fmt, val); \
|
|
if (err) \
|
|
return err; \
|
|
} while (0)
|
|
|
|
#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
|
|
do { \
|
|
int err = input_add_uevent_bm_var(envp, num_envp, &i, \
|
|
buffer, buffer_size, &len, \
|
|
name, bm, max); \
|
|
if (err) \
|
|
return err; \
|
|
} while (0)
|
|
|
|
#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
|
|
do { \
|
|
int err = input_add_uevent_modalias_var(envp, \
|
|
num_envp, &i, \
|
|
buffer, buffer_size, &len, \
|
|
dev); \
|
|
if (err) \
|
|
return err; \
|
|
} while (0)
|
|
|
|
static int input_dev_uevent(struct class_device *cdev, char **envp,
|
|
int num_envp, char *buffer, int buffer_size)
|
|
{
|
|
struct input_dev *dev = to_input_dev(cdev);
|
|
int i = 0;
|
|
int len = 0;
|
|
|
|
INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
|
|
dev->id.bustype, dev->id.vendor,
|
|
dev->id.product, dev->id.version);
|
|
if (dev->name)
|
|
INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
|
|
if (dev->phys)
|
|
INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
|
|
if (dev->uniq)
|
|
INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
|
|
|
|
INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
|
|
if (test_bit(EV_KEY, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
|
|
if (test_bit(EV_REL, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
|
|
if (test_bit(EV_ABS, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
|
|
if (test_bit(EV_MSC, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
|
|
if (test_bit(EV_LED, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
|
|
if (test_bit(EV_SND, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
|
|
if (test_bit(EV_FF, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
|
|
if (test_bit(EV_SW, dev->evbit))
|
|
INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
|
|
|
|
INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
|
|
|
|
envp[i] = NULL;
|
|
return 0;
|
|
}
|
|
|
|
struct class input_class = {
|
|
.name = "input",
|
|
.release = input_dev_release,
|
|
.uevent = input_dev_uevent,
|
|
};
|
|
EXPORT_SYMBOL_GPL(input_class);
|
|
|
|
/**
|
|
* input_allocate_device - allocate memory for new input device
|
|
*
|
|
* Returns prepared struct input_dev or NULL.
|
|
*
|
|
* NOTE: Use input_free_device() to free devices that have not been
|
|
* registered; input_unregister_device() should be used for already
|
|
* registered devices.
|
|
*/
|
|
struct input_dev *input_allocate_device(void)
|
|
{
|
|
struct input_dev *dev;
|
|
|
|
dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
|
|
if (dev) {
|
|
dev->cdev.class = &input_class;
|
|
class_device_initialize(&dev->cdev);
|
|
mutex_init(&dev->mutex);
|
|
INIT_LIST_HEAD(&dev->h_list);
|
|
INIT_LIST_HEAD(&dev->node);
|
|
|
|
__module_get(THIS_MODULE);
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(input_allocate_device);
|
|
|
|
/**
|
|
* input_free_device - free memory occupied by input_dev structure
|
|
* @dev: input device to free
|
|
*
|
|
* This function should only be used if input_register_device()
|
|
* was not called yet or if it failed. Once device was registered
|
|
* use input_unregister_device() and memory will be freed once last
|
|
* refrence to the device is dropped.
|
|
*
|
|
* Device should be allocated by input_allocate_device().
|
|
*
|
|
* NOTE: If there are references to the input device then memory
|
|
* will not be freed until last reference is dropped.
|
|
*/
|
|
void input_free_device(struct input_dev *dev)
|
|
{
|
|
if (dev) {
|
|
|
|
mutex_lock(&dev->mutex);
|
|
dev->name = dev->phys = dev->uniq = NULL;
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
input_put_device(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(input_free_device);
|
|
|
|
int input_register_device(struct input_dev *dev)
|
|
{
|
|
static atomic_t input_no = ATOMIC_INIT(0);
|
|
struct input_handle *handle;
|
|
struct input_handler *handler;
|
|
const struct input_device_id *id;
|
|
const char *path;
|
|
int error;
|
|
|
|
set_bit(EV_SYN, dev->evbit);
|
|
|
|
/*
|
|
* If delay and period are pre-set by the driver, then autorepeating
|
|
* is handled by the driver itself and we don't do it in input.c.
|
|
*/
|
|
|
|
init_timer(&dev->timer);
|
|
if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
|
|
dev->timer.data = (long) dev;
|
|
dev->timer.function = input_repeat_key;
|
|
dev->rep[REP_DELAY] = 250;
|
|
dev->rep[REP_PERIOD] = 33;
|
|
}
|
|
|
|
list_add_tail(&dev->node, &input_dev_list);
|
|
|
|
snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
|
|
"input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
|
|
|
|
error = class_device_add(&dev->cdev);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
|
|
if (error)
|
|
goto fail1;
|
|
|
|
error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
|
|
if (error)
|
|
goto fail2;
|
|
|
|
error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
|
|
if (error)
|
|
goto fail3;
|
|
|
|
path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
|
|
printk(KERN_INFO "input: %s as %s\n",
|
|
dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
|
|
kfree(path);
|
|
|
|
list_for_each_entry(handler, &input_handler_list, node)
|
|
if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
|
|
if ((id = input_match_device(handler->id_table, dev)))
|
|
if ((handle = handler->connect(handler, dev, id))) {
|
|
input_link_handle(handle);
|
|
if (handler->start)
|
|
handler->start(handle);
|
|
}
|
|
|
|
input_wakeup_procfs_readers();
|
|
|
|
return 0;
|
|
|
|
fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
|
|
fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
|
|
fail1: class_device_del(&dev->cdev);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(input_register_device);
|
|
|
|
void input_unregister_device(struct input_dev *dev)
|
|
{
|
|
struct list_head *node, *next;
|
|
int code;
|
|
|
|
for (code = 0; code <= KEY_MAX; code++)
|
|
if (test_bit(code, dev->key))
|
|
input_report_key(dev, code, 0);
|
|
input_sync(dev);
|
|
|
|
del_timer_sync(&dev->timer);
|
|
|
|
list_for_each_safe(node, next, &dev->h_list) {
|
|
struct input_handle * handle = to_handle(node);
|
|
list_del_init(&handle->d_node);
|
|
list_del_init(&handle->h_node);
|
|
handle->handler->disconnect(handle);
|
|
}
|
|
|
|
list_del_init(&dev->node);
|
|
|
|
sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
|
|
sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
|
|
sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
|
|
|
|
mutex_lock(&dev->mutex);
|
|
dev->name = dev->phys = dev->uniq = NULL;
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
class_device_unregister(&dev->cdev);
|
|
|
|
input_wakeup_procfs_readers();
|
|
}
|
|
EXPORT_SYMBOL(input_unregister_device);
|
|
|
|
int input_register_handler(struct input_handler *handler)
|
|
{
|
|
struct input_dev *dev;
|
|
struct input_handle *handle;
|
|
const struct input_device_id *id;
|
|
|
|
INIT_LIST_HEAD(&handler->h_list);
|
|
|
|
if (handler->fops != NULL) {
|
|
if (input_table[handler->minor >> 5])
|
|
return -EBUSY;
|
|
|
|
input_table[handler->minor >> 5] = handler;
|
|
}
|
|
|
|
list_add_tail(&handler->node, &input_handler_list);
|
|
|
|
list_for_each_entry(dev, &input_dev_list, node)
|
|
if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
|
|
if ((id = input_match_device(handler->id_table, dev)))
|
|
if ((handle = handler->connect(handler, dev, id))) {
|
|
input_link_handle(handle);
|
|
if (handler->start)
|
|
handler->start(handle);
|
|
}
|
|
|
|
input_wakeup_procfs_readers();
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(input_register_handler);
|
|
|
|
void input_unregister_handler(struct input_handler *handler)
|
|
{
|
|
struct list_head *node, *next;
|
|
|
|
list_for_each_safe(node, next, &handler->h_list) {
|
|
struct input_handle * handle = to_handle_h(node);
|
|
list_del_init(&handle->h_node);
|
|
list_del_init(&handle->d_node);
|
|
handler->disconnect(handle);
|
|
}
|
|
|
|
list_del_init(&handler->node);
|
|
|
|
if (handler->fops != NULL)
|
|
input_table[handler->minor >> 5] = NULL;
|
|
|
|
input_wakeup_procfs_readers();
|
|
}
|
|
EXPORT_SYMBOL(input_unregister_handler);
|
|
|
|
static int input_open_file(struct inode *inode, struct file *file)
|
|
{
|
|
struct input_handler *handler = input_table[iminor(inode) >> 5];
|
|
const struct file_operations *old_fops, *new_fops = NULL;
|
|
int err;
|
|
|
|
/* No load-on-demand here? */
|
|
if (!handler || !(new_fops = fops_get(handler->fops)))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* That's _really_ odd. Usually NULL ->open means "nothing special",
|
|
* not "no device". Oh, well...
|
|
*/
|
|
if (!new_fops->open) {
|
|
fops_put(new_fops);
|
|
return -ENODEV;
|
|
}
|
|
old_fops = file->f_op;
|
|
file->f_op = new_fops;
|
|
|
|
err = new_fops->open(inode, file);
|
|
|
|
if (err) {
|
|
fops_put(file->f_op);
|
|
file->f_op = fops_get(old_fops);
|
|
}
|
|
fops_put(old_fops);
|
|
return err;
|
|
}
|
|
|
|
static struct file_operations input_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = input_open_file,
|
|
};
|
|
|
|
static int __init input_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = class_register(&input_class);
|
|
if (err) {
|
|
printk(KERN_ERR "input: unable to register input_dev class\n");
|
|
return err;
|
|
}
|
|
|
|
err = input_proc_init();
|
|
if (err)
|
|
goto fail1;
|
|
|
|
err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
|
|
if (err) {
|
|
printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
|
|
goto fail2;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail2: input_proc_exit();
|
|
fail1: class_unregister(&input_class);
|
|
return err;
|
|
}
|
|
|
|
static void __exit input_exit(void)
|
|
{
|
|
input_proc_exit();
|
|
unregister_chrdev(INPUT_MAJOR, "input");
|
|
class_unregister(&input_class);
|
|
}
|
|
|
|
subsys_initcall(input_init);
|
|
module_exit(input_exit);
|