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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1668 lines
40 KiB
C
1668 lines
40 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/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/poll.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/rcupdate.h>
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#include <linux/smp_lock.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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/*
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* input_mutex protects access to both input_dev_list and input_handler_list.
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* This also causes input_[un]register_device and input_[un]register_handler
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* be mutually exclusive which simplifies locking in drivers implementing
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* input handlers.
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*/
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static DEFINE_MUTEX(input_mutex);
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static struct input_handler *input_table[8];
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static inline int is_event_supported(unsigned int code,
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unsigned long *bm, unsigned int max)
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{
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return code <= max && test_bit(code, bm);
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}
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static int input_defuzz_abs_event(int value, int old_val, int fuzz)
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{
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if (fuzz) {
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if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
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return old_val;
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if (value > old_val - fuzz && value < old_val + fuzz)
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return (old_val * 3 + value) / 4;
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if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
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return (old_val + value) / 2;
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}
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return value;
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}
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/*
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* Pass event through all open handles. This function is called with
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* dev->event_lock held and interrupts disabled.
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*/
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static void input_pass_event(struct input_dev *dev,
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unsigned int type, unsigned int code, int value)
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{
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struct input_handle *handle;
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rcu_read_lock();
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handle = rcu_dereference(dev->grab);
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if (handle)
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handle->handler->event(handle, type, code, value);
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else
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list_for_each_entry_rcu(handle, &dev->h_list, d_node)
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if (handle->open)
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handle->handler->event(handle,
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type, code, value);
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rcu_read_unlock();
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}
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/*
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* Generate software autorepeat event. Note that we take
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* dev->event_lock here to avoid racing with input_event
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* which may cause keys get "stuck".
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*/
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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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unsigned long flags;
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spin_lock_irqsave(&dev->event_lock, flags);
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if (test_bit(dev->repeat_key, dev->key) &&
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is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
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input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
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if (dev->sync) {
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/*
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* Only send SYN_REPORT if we are not in a middle
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* of driver parsing a new hardware packet.
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* Otherwise assume that the driver will send
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* SYN_REPORT once it's done.
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*/
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input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
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}
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if (dev->rep[REP_PERIOD])
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mod_timer(&dev->timer, jiffies +
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msecs_to_jiffies(dev->rep[REP_PERIOD]));
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}
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spin_unlock_irqrestore(&dev->event_lock, flags);
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}
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static void input_start_autorepeat(struct input_dev *dev, int code)
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{
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if (test_bit(EV_REP, dev->evbit) &&
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dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
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dev->timer.data) {
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dev->repeat_key = code;
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mod_timer(&dev->timer,
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jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
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}
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}
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#define INPUT_IGNORE_EVENT 0
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#define INPUT_PASS_TO_HANDLERS 1
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#define INPUT_PASS_TO_DEVICE 2
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#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
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static void input_handle_event(struct input_dev *dev,
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unsigned int type, unsigned int code, int value)
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{
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int disposition = INPUT_IGNORE_EVENT;
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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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disposition = INPUT_PASS_TO_ALL;
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break;
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case SYN_REPORT:
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if (!dev->sync) {
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dev->sync = 1;
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disposition = INPUT_PASS_TO_HANDLERS;
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}
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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 (is_event_supported(code, dev->keybit, KEY_MAX) &&
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!!test_bit(code, dev->key) != value) {
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if (value != 2) {
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__change_bit(code, dev->key);
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if (value)
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input_start_autorepeat(dev, code);
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}
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disposition = INPUT_PASS_TO_HANDLERS;
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}
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break;
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case EV_SW:
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if (is_event_supported(code, dev->swbit, SW_MAX) &&
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!!test_bit(code, dev->sw) != value) {
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__change_bit(code, dev->sw);
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disposition = INPUT_PASS_TO_HANDLERS;
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}
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break;
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case EV_ABS:
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if (is_event_supported(code, dev->absbit, ABS_MAX)) {
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value = input_defuzz_abs_event(value,
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dev->abs[code], dev->absfuzz[code]);
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if (dev->abs[code] != value) {
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dev->abs[code] = value;
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disposition = INPUT_PASS_TO_HANDLERS;
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}
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}
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break;
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case EV_REL:
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if (is_event_supported(code, dev->relbit, REL_MAX) && value)
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disposition = INPUT_PASS_TO_HANDLERS;
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break;
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case EV_MSC:
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if (is_event_supported(code, dev->mscbit, MSC_MAX))
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disposition = INPUT_PASS_TO_ALL;
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break;
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case EV_LED:
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if (is_event_supported(code, dev->ledbit, LED_MAX) &&
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!!test_bit(code, dev->led) != value) {
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__change_bit(code, dev->led);
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disposition = INPUT_PASS_TO_ALL;
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}
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break;
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case EV_SND:
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if (is_event_supported(code, dev->sndbit, SND_MAX)) {
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if (!!test_bit(code, dev->snd) != !!value)
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__change_bit(code, dev->snd);
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disposition = INPUT_PASS_TO_ALL;
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}
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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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dev->rep[code] = value;
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disposition = INPUT_PASS_TO_ALL;
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}
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break;
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case EV_FF:
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if (value >= 0)
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disposition = INPUT_PASS_TO_ALL;
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break;
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case EV_PWR:
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disposition = INPUT_PASS_TO_ALL;
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break;
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}
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if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
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dev->sync = 0;
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if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
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dev->event(dev, type, code, value);
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if (disposition & INPUT_PASS_TO_HANDLERS)
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input_pass_event(dev, type, code, value);
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}
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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
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* devices. See also input_inject_event().
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*/
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void input_event(struct input_dev *dev,
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unsigned int type, unsigned int code, int value)
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{
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unsigned long flags;
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if (is_event_supported(type, dev->evbit, EV_MAX)) {
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spin_lock_irqsave(&dev->event_lock, flags);
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add_input_randomness(type, code, value);
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input_handle_event(dev, type, code, value);
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spin_unlock_irqrestore(&dev->event_lock, flags);
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}
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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
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* "grabbed" and handle injecting event is not the one that owns
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* the device.
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*/
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void input_inject_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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struct input_dev *dev = handle->dev;
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struct input_handle *grab;
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unsigned long flags;
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if (is_event_supported(type, dev->evbit, EV_MAX)) {
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spin_lock_irqsave(&dev->event_lock, flags);
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rcu_read_lock();
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grab = rcu_dereference(dev->grab);
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if (!grab || grab == handle)
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input_handle_event(dev, type, code, value);
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rcu_read_unlock();
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spin_unlock_irqrestore(&dev->event_lock, flags);
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}
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}
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EXPORT_SYMBOL(input_inject_event);
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/**
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* input_grab_device - grabs device for exclusive use
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* @handle: input handle that wants to own the device
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*
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* When a device is grabbed by an input handle all events generated by
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* the device are delivered only to this handle. Also events injected
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* by other input handles are ignored while device is grabbed.
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*/
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int input_grab_device(struct input_handle *handle)
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{
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struct input_dev *dev = handle->dev;
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int retval;
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retval = mutex_lock_interruptible(&dev->mutex);
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if (retval)
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return retval;
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if (dev->grab) {
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retval = -EBUSY;
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goto out;
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}
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rcu_assign_pointer(dev->grab, handle);
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synchronize_rcu();
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out:
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mutex_unlock(&dev->mutex);
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return retval;
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}
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EXPORT_SYMBOL(input_grab_device);
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static 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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rcu_assign_pointer(dev->grab, NULL);
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/* Make sure input_pass_event() notices that grab is gone */
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synchronize_rcu();
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list_for_each_entry(handle, &dev->h_list, d_node)
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if (handle->open && handle->handler->start)
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handle->handler->start(handle);
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}
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}
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/**
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* input_release_device - release previously grabbed device
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* @handle: input handle that owns the device
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*
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* Releases previously grabbed device so that other input handles can
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* start receiving input events. Upon release all handlers attached
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* to the device have their start() method called so they have a change
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* to synchronize device state with the rest of the system.
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*/
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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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mutex_lock(&dev->mutex);
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__input_release_device(handle);
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mutex_unlock(&dev->mutex);
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}
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EXPORT_SYMBOL(input_release_device);
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/**
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* input_open_device - open input device
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* @handle: handle through which device is being accessed
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*
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* This function should be called by input handlers when they
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* want to start receive events from given input device.
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*/
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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 retval;
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retval = mutex_lock_interruptible(&dev->mutex);
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if (retval)
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return retval;
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if (dev->going_away) {
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retval = -ENODEV;
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goto out;
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}
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handle->open++;
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if (!dev->users++ && dev->open)
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retval = dev->open(dev);
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if (retval) {
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dev->users--;
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if (!--handle->open) {
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/*
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* Make sure we are not delivering any more events
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* through this handle
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*/
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synchronize_rcu();
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}
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}
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out:
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mutex_unlock(&dev->mutex);
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return retval;
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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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struct input_dev *dev = handle->dev;
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int retval;
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retval = mutex_lock_interruptible(&dev->mutex);
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if (retval)
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return retval;
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if (dev->flush)
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retval = dev->flush(dev, file);
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mutex_unlock(&dev->mutex);
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return retval;
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}
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EXPORT_SYMBOL(input_flush_device);
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/**
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* input_close_device - close input device
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* @handle: handle through which device is being accessed
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*
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* This function should be called by input handlers when they
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* want to stop receive events from given input device.
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*/
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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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mutex_lock(&dev->mutex);
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__input_release_device(handle);
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if (!--dev->users && dev->close)
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dev->close(dev);
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if (!--handle->open) {
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/*
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* synchronize_rcu() makes sure that input_pass_event()
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* completed and that no more input events are delivered
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* through this handle
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*/
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synchronize_rcu();
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}
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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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|
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/*
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* Prepare device for unregistering
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*/
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static void input_disconnect_device(struct input_dev *dev)
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{
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struct input_handle *handle;
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int code;
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|
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/*
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* Mark device as going away. Note that we take dev->mutex here
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* not to protect access to dev->going_away but rather to ensure
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* that there are no threads in the middle of input_open_device()
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*/
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mutex_lock(&dev->mutex);
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dev->going_away = 1;
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mutex_unlock(&dev->mutex);
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|
|
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spin_lock_irq(&dev->event_lock);
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|
|
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/*
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* Simulate keyup events for all pressed keys so that handlers
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* are not left with "stuck" keys. The driver may continue
|
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* generate events even after we done here but they will not
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* reach any handlers.
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*/
|
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if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
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for (code = 0; code <= KEY_MAX; code++) {
|
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if (is_event_supported(code, dev->keybit, KEY_MAX) &&
|
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__test_and_clear_bit(code, dev->key)) {
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input_pass_event(dev, EV_KEY, code, 0);
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}
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}
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input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
|
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}
|
|
|
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list_for_each_entry(handle, &dev->h_list, d_node)
|
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handle->open = 0;
|
|
|
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spin_unlock_irq(&dev->event_lock);
|
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}
|
|
|
|
static int input_fetch_keycode(struct input_dev *dev, int scancode)
|
|
{
|
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switch (dev->keycodesize) {
|
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case 1:
|
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return ((u8 *)dev->keycode)[scancode];
|
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|
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case 2:
|
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return ((u16 *)dev->keycode)[scancode];
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|
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default:
|
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return ((u32 *)dev->keycode)[scancode];
|
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}
|
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}
|
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|
|
static int input_default_getkeycode(struct input_dev *dev,
|
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int scancode, int *keycode)
|
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{
|
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if (!dev->keycodesize)
|
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return -EINVAL;
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|
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if (scancode >= dev->keycodemax)
|
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return -EINVAL;
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|
|
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*keycode = input_fetch_keycode(dev, scancode);
|
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|
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return 0;
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}
|
|
|
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static int input_default_setkeycode(struct input_dev *dev,
|
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int scancode, int keycode)
|
|
{
|
|
int old_keycode;
|
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int i;
|
|
|
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if (scancode >= dev->keycodemax)
|
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return -EINVAL;
|
|
|
|
if (!dev->keycodesize)
|
|
return -EINVAL;
|
|
|
|
if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
|
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return -EINVAL;
|
|
|
|
switch (dev->keycodesize) {
|
|
case 1: {
|
|
u8 *k = (u8 *)dev->keycode;
|
|
old_keycode = k[scancode];
|
|
k[scancode] = keycode;
|
|
break;
|
|
}
|
|
case 2: {
|
|
u16 *k = (u16 *)dev->keycode;
|
|
old_keycode = k[scancode];
|
|
k[scancode] = keycode;
|
|
break;
|
|
}
|
|
default: {
|
|
u32 *k = (u32 *)dev->keycode;
|
|
old_keycode = k[scancode];
|
|
k[scancode] = keycode;
|
|
break;
|
|
}
|
|
}
|
|
|
|
clear_bit(old_keycode, dev->keybit);
|
|
set_bit(keycode, dev->keybit);
|
|
|
|
for (i = 0; i < dev->keycodemax; i++) {
|
|
if (input_fetch_keycode(dev, i) == old_keycode) {
|
|
set_bit(old_keycode, dev->keybit);
|
|
break; /* Setting the bit twice is useless, so break */
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* input_get_keycode - retrieve keycode currently mapped to a given scancode
|
|
* @dev: input device which keymap is being queried
|
|
* @scancode: scancode (or its equivalent for device in question) for which
|
|
* keycode is needed
|
|
* @keycode: result
|
|
*
|
|
* This function should be called by anyone interested in retrieving current
|
|
* keymap. Presently keyboard and evdev handlers use it.
|
|
*/
|
|
int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
|
|
{
|
|
if (scancode < 0)
|
|
return -EINVAL;
|
|
|
|
return dev->getkeycode(dev, scancode, keycode);
|
|
}
|
|
EXPORT_SYMBOL(input_get_keycode);
|
|
|
|
/**
|
|
* input_get_keycode - assign new keycode to a given scancode
|
|
* @dev: input device which keymap is being updated
|
|
* @scancode: scancode (or its equivalent for device in question)
|
|
* @keycode: new keycode to be assigned to the scancode
|
|
*
|
|
* This function should be called by anyone needing to update current
|
|
* keymap. Presently keyboard and evdev handlers use it.
|
|
*/
|
|
int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
|
|
{
|
|
unsigned long flags;
|
|
int old_keycode;
|
|
int retval;
|
|
|
|
if (scancode < 0)
|
|
return -EINVAL;
|
|
|
|
if (keycode < 0 || keycode > KEY_MAX)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, flags);
|
|
|
|
retval = dev->getkeycode(dev, scancode, &old_keycode);
|
|
if (retval)
|
|
goto out;
|
|
|
|
retval = dev->setkeycode(dev, scancode, keycode);
|
|
if (retval)
|
|
goto out;
|
|
|
|
/*
|
|
* Simulate keyup event if keycode is not present
|
|
* in the keymap anymore
|
|
*/
|
|
if (test_bit(EV_KEY, dev->evbit) &&
|
|
!is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
|
|
__test_and_clear_bit(old_keycode, dev->key)) {
|
|
|
|
input_pass_event(dev, EV_KEY, old_keycode, 0);
|
|
if (dev->sync)
|
|
input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(input_set_keycode);
|
|
|
|
#define MATCH_BIT(bit, max) \
|
|
for (i = 0; i < BITS_TO_LONGS(max); i++) \
|
|
if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
|
|
break; \
|
|
if (i != BITS_TO_LONGS(max)) \
|
|
continue;
|
|
|
|
static const struct input_device_id *input_match_device(const struct input_device_id *id,
|
|
struct input_dev *dev)
|
|
{
|
|
int i;
|
|
|
|
for (; id->flags || id->driver_info; id++) {
|
|
|
|
if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
|
|
if (id->bustype != dev->id.bustype)
|
|
continue;
|
|
|
|
if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
|
|
if (id->vendor != dev->id.vendor)
|
|
continue;
|
|
|
|
if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
|
|
if (id->product != dev->id.product)
|
|
continue;
|
|
|
|
if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
|
|
if (id->version != dev->id.version)
|
|
continue;
|
|
|
|
MATCH_BIT(evbit, EV_MAX);
|
|
MATCH_BIT(keybit, KEY_MAX);
|
|
MATCH_BIT(relbit, REL_MAX);
|
|
MATCH_BIT(absbit, ABS_MAX);
|
|
MATCH_BIT(mscbit, MSC_MAX);
|
|
MATCH_BIT(ledbit, LED_MAX);
|
|
MATCH_BIT(sndbit, SND_MAX);
|
|
MATCH_BIT(ffbit, FF_MAX);
|
|
MATCH_BIT(swbit, SW_MAX);
|
|
|
|
return id;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
|
|
{
|
|
const struct input_device_id *id;
|
|
int error;
|
|
|
|
if (handler->blacklist && input_match_device(handler->blacklist, dev))
|
|
return -ENODEV;
|
|
|
|
id = input_match_device(handler->id_table, dev);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
error = handler->connect(handler, dev, id);
|
|
if (error && error != -ENODEV)
|
|
printk(KERN_ERR
|
|
"input: failed to attach handler %s to device %s, "
|
|
"error: %d\n",
|
|
handler->name, kobject_name(&dev->dev.kobj), error);
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static struct proc_dir_entry *proc_bus_input_dir;
|
|
static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
|
|
static int input_devices_state;
|
|
|
|
static inline void input_wakeup_procfs_readers(void)
|
|
{
|
|
input_devices_state++;
|
|
wake_up(&input_devices_poll_wait);
|
|
}
|
|
|
|
static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
|
|
{
|
|
int state = input_devices_state;
|
|
|
|
poll_wait(file, &input_devices_poll_wait, wait);
|
|
if (state != input_devices_state)
|
|
return POLLIN | POLLRDNORM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
if (mutex_lock_interruptible(&input_mutex))
|
|
return NULL;
|
|
|
|
return seq_list_start(&input_dev_list, *pos);
|
|
}
|
|
|
|
static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
return seq_list_next(v, &input_dev_list, pos);
|
|
}
|
|
|
|
static void input_devices_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
mutex_unlock(&input_mutex);
|
|
}
|
|
|
|
static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
|
|
unsigned long *bitmap, int max)
|
|
{
|
|
int i;
|
|
|
|
for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
|
|
if (bitmap[i])
|
|
break;
|
|
|
|
seq_printf(seq, "B: %s=", name);
|
|
for (; i >= 0; i--)
|
|
seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
|
|
seq_putc(seq, '\n');
|
|
}
|
|
|
|
static int input_devices_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct input_dev *dev = container_of(v, struct input_dev, node);
|
|
const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
|
struct input_handle *handle;
|
|
|
|
seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
|
|
dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
|
|
|
|
seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
|
|
seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
|
|
seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
|
|
seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
|
|
seq_printf(seq, "H: Handlers=");
|
|
|
|
list_for_each_entry(handle, &dev->h_list, d_node)
|
|
seq_printf(seq, "%s ", handle->name);
|
|
seq_putc(seq, '\n');
|
|
|
|
input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
|
|
if (test_bit(EV_KEY, dev->evbit))
|
|
input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
|
|
if (test_bit(EV_REL, dev->evbit))
|
|
input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
|
|
if (test_bit(EV_ABS, dev->evbit))
|
|
input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
|
|
if (test_bit(EV_MSC, dev->evbit))
|
|
input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
|
|
if (test_bit(EV_LED, dev->evbit))
|
|
input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
|
|
if (test_bit(EV_SND, dev->evbit))
|
|
input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
|
|
if (test_bit(EV_FF, dev->evbit))
|
|
input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
|
|
if (test_bit(EV_SW, dev->evbit))
|
|
input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
|
|
|
|
seq_putc(seq, '\n');
|
|
|
|
kfree(path);
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations input_devices_seq_ops = {
|
|
.start = input_devices_seq_start,
|
|
.next = input_devices_seq_next,
|
|
.stop = input_devices_seq_stop,
|
|
.show = input_devices_seq_show,
|
|
};
|
|
|
|
static int input_proc_devices_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &input_devices_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations input_devices_fileops = {
|
|
.owner = THIS_MODULE,
|
|
.open = input_proc_devices_open,
|
|
.poll = input_proc_devices_poll,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
if (mutex_lock_interruptible(&input_mutex))
|
|
return NULL;
|
|
|
|
seq->private = (void *)(unsigned long)*pos;
|
|
return seq_list_start(&input_handler_list, *pos);
|
|
}
|
|
|
|
static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
seq->private = (void *)(unsigned long)(*pos + 1);
|
|
return seq_list_next(v, &input_handler_list, pos);
|
|
}
|
|
|
|
static void input_handlers_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
mutex_unlock(&input_mutex);
|
|
}
|
|
|
|
static int input_handlers_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct input_handler *handler = container_of(v, struct input_handler, node);
|
|
|
|
seq_printf(seq, "N: Number=%ld Name=%s",
|
|
(unsigned long)seq->private, handler->name);
|
|
if (handler->fops)
|
|
seq_printf(seq, " Minor=%d", handler->minor);
|
|
seq_putc(seq, '\n');
|
|
|
|
return 0;
|
|
}
|
|
static const struct seq_operations input_handlers_seq_ops = {
|
|
.start = input_handlers_seq_start,
|
|
.next = input_handlers_seq_next,
|
|
.stop = input_handlers_seq_stop,
|
|
.show = input_handlers_seq_show,
|
|
};
|
|
|
|
static int input_proc_handlers_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &input_handlers_seq_ops);
|
|
}
|
|
|
|
static const 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("bus/input", NULL);
|
|
if (!proc_bus_input_dir)
|
|
return -ENOMEM;
|
|
|
|
proc_bus_input_dir->owner = THIS_MODULE;
|
|
|
|
entry = proc_create("devices", 0, proc_bus_input_dir,
|
|
&input_devices_fileops);
|
|
if (!entry)
|
|
goto fail1;
|
|
|
|
entry = proc_create("handlers", 0, proc_bus_input_dir,
|
|
&input_handlers_fileops);
|
|
if (!entry)
|
|
goto fail2;
|
|
|
|
return 0;
|
|
|
|
fail2: remove_proc_entry("devices", proc_bus_input_dir);
|
|
fail1: remove_proc_entry("bus/input", NULL);
|
|
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("bus/input", NULL);
|
|
}
|
|
|
|
#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 device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct input_dev *input_dev = to_input_dev(dev); \
|
|
\
|
|
return scnprintf(buf, PAGE_SIZE, "%s\n", \
|
|
input_dev->name ? input_dev->name : ""); \
|
|
} \
|
|
static 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[BIT_WORD(i)] & BIT_MASK(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 device *dev,
|
|
struct device_attribute *attr,
|
|
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 DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
|
|
|
|
static struct attribute *input_dev_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_phys.attr,
|
|
&dev_attr_uniq.attr,
|
|
&dev_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 device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct input_dev *input_dev = to_input_dev(dev); \
|
|
return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
|
|
} \
|
|
static 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[] = {
|
|
&dev_attr_bustype.attr,
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_product.attr,
|
|
&dev_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 = BITS_TO_LONGS(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 device *dev, \
|
|
struct device_attribute *attr, \
|
|
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 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[] = {
|
|
&dev_attr_ev.attr,
|
|
&dev_attr_key.attr,
|
|
&dev_attr_rel.attr,
|
|
&dev_attr_abs.attr,
|
|
&dev_attr_msc.attr,
|
|
&dev_attr_led.attr,
|
|
&dev_attr_snd.attr,
|
|
&dev_attr_ff.attr,
|
|
&dev_attr_sw.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group input_dev_caps_attr_group = {
|
|
.name = "capabilities",
|
|
.attrs = input_dev_caps_attrs,
|
|
};
|
|
|
|
static struct attribute_group *input_dev_attr_groups[] = {
|
|
&input_dev_attr_group,
|
|
&input_dev_id_attr_group,
|
|
&input_dev_caps_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static void input_dev_release(struct device *device)
|
|
{
|
|
struct input_dev *dev = to_input_dev(device);
|
|
|
|
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(struct kobj_uevent_env *env,
|
|
const char *name, unsigned long *bitmap, int max)
|
|
{
|
|
int len;
|
|
|
|
if (add_uevent_var(env, "%s=", name))
|
|
return -ENOMEM;
|
|
|
|
len = input_print_bitmap(&env->buf[env->buflen - 1],
|
|
sizeof(env->buf) - env->buflen,
|
|
bitmap, max, 0);
|
|
if (len >= (sizeof(env->buf) - env->buflen))
|
|
return -ENOMEM;
|
|
|
|
env->buflen += len;
|
|
return 0;
|
|
}
|
|
|
|
static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
|
|
struct input_dev *dev)
|
|
{
|
|
int len;
|
|
|
|
if (add_uevent_var(env, "MODALIAS="))
|
|
return -ENOMEM;
|
|
|
|
len = input_print_modalias(&env->buf[env->buflen - 1],
|
|
sizeof(env->buf) - env->buflen,
|
|
dev, 0);
|
|
if (len >= (sizeof(env->buf) - env->buflen))
|
|
return -ENOMEM;
|
|
|
|
env->buflen += len;
|
|
return 0;
|
|
}
|
|
|
|
#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
|
|
do { \
|
|
int err = add_uevent_var(env, 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(env, name, bm, max); \
|
|
if (err) \
|
|
return err; \
|
|
} while (0)
|
|
|
|
#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
|
|
do { \
|
|
int err = input_add_uevent_modalias_var(env, dev); \
|
|
if (err) \
|
|
return err; \
|
|
} while (0)
|
|
|
|
static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
|
|
{
|
|
struct input_dev *dev = to_input_dev(device);
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct device_type input_dev_type = {
|
|
.groups = input_dev_attr_groups,
|
|
.release = input_dev_release,
|
|
.uevent = input_dev_uevent,
|
|
};
|
|
|
|
struct class input_class = {
|
|
.name = "input",
|
|
};
|
|
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->dev.type = &input_dev_type;
|
|
dev->dev.class = &input_class;
|
|
device_initialize(&dev->dev);
|
|
mutex_init(&dev->mutex);
|
|
spin_lock_init(&dev->event_lock);
|
|
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
|
|
* reference 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)
|
|
input_put_device(dev);
|
|
}
|
|
EXPORT_SYMBOL(input_free_device);
|
|
|
|
/**
|
|
* input_set_capability - mark device as capable of a certain event
|
|
* @dev: device that is capable of emitting or accepting event
|
|
* @type: type of the event (EV_KEY, EV_REL, etc...)
|
|
* @code: event code
|
|
*
|
|
* In addition to setting up corresponding bit in appropriate capability
|
|
* bitmap the function also adjusts dev->evbit.
|
|
*/
|
|
void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
|
|
{
|
|
switch (type) {
|
|
case EV_KEY:
|
|
__set_bit(code, dev->keybit);
|
|
break;
|
|
|
|
case EV_REL:
|
|
__set_bit(code, dev->relbit);
|
|
break;
|
|
|
|
case EV_ABS:
|
|
__set_bit(code, dev->absbit);
|
|
break;
|
|
|
|
case EV_MSC:
|
|
__set_bit(code, dev->mscbit);
|
|
break;
|
|
|
|
case EV_SW:
|
|
__set_bit(code, dev->swbit);
|
|
break;
|
|
|
|
case EV_LED:
|
|
__set_bit(code, dev->ledbit);
|
|
break;
|
|
|
|
case EV_SND:
|
|
__set_bit(code, dev->sndbit);
|
|
break;
|
|
|
|
case EV_FF:
|
|
__set_bit(code, dev->ffbit);
|
|
break;
|
|
|
|
case EV_PWR:
|
|
/* do nothing */
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_ERR
|
|
"input_set_capability: unknown type %u (code %u)\n",
|
|
type, code);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
__set_bit(type, dev->evbit);
|
|
}
|
|
EXPORT_SYMBOL(input_set_capability);
|
|
|
|
/**
|
|
* input_register_device - register device with input core
|
|
* @dev: device to be registered
|
|
*
|
|
* This function registers device with input core. The device must be
|
|
* allocated with input_allocate_device() and all it's capabilities
|
|
* set up before registering.
|
|
* If function fails the device must be freed with input_free_device().
|
|
* Once device has been successfully registered it can be unregistered
|
|
* with input_unregister_device(); input_free_device() should not be
|
|
* called in this case.
|
|
*/
|
|
int input_register_device(struct input_dev *dev)
|
|
{
|
|
static atomic_t input_no = ATOMIC_INIT(0);
|
|
struct input_handler *handler;
|
|
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;
|
|
}
|
|
|
|
if (!dev->getkeycode)
|
|
dev->getkeycode = input_default_getkeycode;
|
|
|
|
if (!dev->setkeycode)
|
|
dev->setkeycode = input_default_setkeycode;
|
|
|
|
snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
|
|
"input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
|
|
|
|
error = device_add(&dev->dev);
|
|
if (error)
|
|
return error;
|
|
|
|
path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
|
printk(KERN_INFO "input: %s as %s\n",
|
|
dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
|
|
kfree(path);
|
|
|
|
error = mutex_lock_interruptible(&input_mutex);
|
|
if (error) {
|
|
device_del(&dev->dev);
|
|
return error;
|
|
}
|
|
|
|
list_add_tail(&dev->node, &input_dev_list);
|
|
|
|
list_for_each_entry(handler, &input_handler_list, node)
|
|
input_attach_handler(dev, handler);
|
|
|
|
input_wakeup_procfs_readers();
|
|
|
|
mutex_unlock(&input_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(input_register_device);
|
|
|
|
/**
|
|
* input_unregister_device - unregister previously registered device
|
|
* @dev: device to be unregistered
|
|
*
|
|
* This function unregisters an input device. Once device is unregistered
|
|
* the caller should not try to access it as it may get freed at any moment.
|
|
*/
|
|
void input_unregister_device(struct input_dev *dev)
|
|
{
|
|
struct input_handle *handle, *next;
|
|
|
|
input_disconnect_device(dev);
|
|
|
|
mutex_lock(&input_mutex);
|
|
|
|
list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
|
|
handle->handler->disconnect(handle);
|
|
WARN_ON(!list_empty(&dev->h_list));
|
|
|
|
del_timer_sync(&dev->timer);
|
|
list_del_init(&dev->node);
|
|
|
|
input_wakeup_procfs_readers();
|
|
|
|
mutex_unlock(&input_mutex);
|
|
|
|
device_unregister(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(input_unregister_device);
|
|
|
|
/**
|
|
* input_register_handler - register a new input handler
|
|
* @handler: handler to be registered
|
|
*
|
|
* This function registers a new input handler (interface) for input
|
|
* devices in the system and attaches it to all input devices that
|
|
* are compatible with the handler.
|
|
*/
|
|
int input_register_handler(struct input_handler *handler)
|
|
{
|
|
struct input_dev *dev;
|
|
int retval;
|
|
|
|
retval = mutex_lock_interruptible(&input_mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
INIT_LIST_HEAD(&handler->h_list);
|
|
|
|
if (handler->fops != NULL) {
|
|
if (input_table[handler->minor >> 5]) {
|
|
retval = -EBUSY;
|
|
goto out;
|
|
}
|
|
input_table[handler->minor >> 5] = handler;
|
|
}
|
|
|
|
list_add_tail(&handler->node, &input_handler_list);
|
|
|
|
list_for_each_entry(dev, &input_dev_list, node)
|
|
input_attach_handler(dev, handler);
|
|
|
|
input_wakeup_procfs_readers();
|
|
|
|
out:
|
|
mutex_unlock(&input_mutex);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(input_register_handler);
|
|
|
|
/**
|
|
* input_unregister_handler - unregisters an input handler
|
|
* @handler: handler to be unregistered
|
|
*
|
|
* This function disconnects a handler from its input devices and
|
|
* removes it from lists of known handlers.
|
|
*/
|
|
void input_unregister_handler(struct input_handler *handler)
|
|
{
|
|
struct input_handle *handle, *next;
|
|
|
|
mutex_lock(&input_mutex);
|
|
|
|
list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
|
|
handler->disconnect(handle);
|
|
WARN_ON(!list_empty(&handler->h_list));
|
|
|
|
list_del_init(&handler->node);
|
|
|
|
if (handler->fops != NULL)
|
|
input_table[handler->minor >> 5] = NULL;
|
|
|
|
input_wakeup_procfs_readers();
|
|
|
|
mutex_unlock(&input_mutex);
|
|
}
|
|
EXPORT_SYMBOL(input_unregister_handler);
|
|
|
|
/**
|
|
* input_register_handle - register a new input handle
|
|
* @handle: handle to register
|
|
*
|
|
* This function puts a new input handle onto device's
|
|
* and handler's lists so that events can flow through
|
|
* it once it is opened using input_open_device().
|
|
*
|
|
* This function is supposed to be called from handler's
|
|
* connect() method.
|
|
*/
|
|
int input_register_handle(struct input_handle *handle)
|
|
{
|
|
struct input_handler *handler = handle->handler;
|
|
struct input_dev *dev = handle->dev;
|
|
int error;
|
|
|
|
/*
|
|
* We take dev->mutex here to prevent race with
|
|
* input_release_device().
|
|
*/
|
|
error = mutex_lock_interruptible(&dev->mutex);
|
|
if (error)
|
|
return error;
|
|
list_add_tail_rcu(&handle->d_node, &dev->h_list);
|
|
mutex_unlock(&dev->mutex);
|
|
synchronize_rcu();
|
|
|
|
/*
|
|
* Since we are supposed to be called from ->connect()
|
|
* which is mutually exclusive with ->disconnect()
|
|
* we can't be racing with input_unregister_handle()
|
|
* and so separate lock is not needed here.
|
|
*/
|
|
list_add_tail(&handle->h_node, &handler->h_list);
|
|
|
|
if (handler->start)
|
|
handler->start(handle);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(input_register_handle);
|
|
|
|
/**
|
|
* input_unregister_handle - unregister an input handle
|
|
* @handle: handle to unregister
|
|
*
|
|
* This function removes input handle from device's
|
|
* and handler's lists.
|
|
*
|
|
* This function is supposed to be called from handler's
|
|
* disconnect() method.
|
|
*/
|
|
void input_unregister_handle(struct input_handle *handle)
|
|
{
|
|
struct input_dev *dev = handle->dev;
|
|
|
|
list_del_init(&handle->h_node);
|
|
|
|
/*
|
|
* Take dev->mutex to prevent race with input_release_device().
|
|
*/
|
|
mutex_lock(&dev->mutex);
|
|
list_del_rcu(&handle->d_node);
|
|
mutex_unlock(&dev->mutex);
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL(input_unregister_handle);
|
|
|
|
static int input_open_file(struct inode *inode, struct file *file)
|
|
{
|
|
struct input_handler *handler;
|
|
const struct file_operations *old_fops, *new_fops = NULL;
|
|
int err;
|
|
|
|
lock_kernel();
|
|
/* No load-on-demand here? */
|
|
handler = input_table[iminor(inode) >> 5];
|
|
if (!handler || !(new_fops = fops_get(handler->fops))) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* That's _really_ odd. Usually NULL ->open means "nothing special",
|
|
* not "no device". Oh, well...
|
|
*/
|
|
if (!new_fops->open) {
|
|
fops_put(new_fops);
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
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);
|
|
out:
|
|
unlock_kernel();
|
|
return err;
|
|
}
|
|
|
|
static const 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);
|