| 1 | |
| 2 | * The input core
|
| 3 | *
|
| 4 | * Copyright (c) 1999-2002 Vojtech Pavlik
|
| 5 |
|
| 6 |
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| 7 | |
| 8 | * This program is free software; you can redistribute it and/or modify it
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| 9 | * under the terms of the GNU General Public License version 2 as published by
|
| 10 | * the Free Software Foundation.
|
| 11 |
|
| 12 |
|
| 13 | #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
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| 14 |
|
| 15 | #include <linux/init.h>
|
| 16 | #include <linux/types.h>
|
| 17 | #include <linux/idr.h>
|
| 18 | #include <linux/input/mt.h>
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| 19 | #include <linux/module.h>
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| 20 | #include <linux/slab.h>
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| 21 | #include <linux/random.h>
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| 22 | #include <linux/major.h>
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| 23 | #include <linux/proc_fs.h>
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| 24 | #include <linux/sched.h>
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| 25 | #include <linux/seq_file.h>
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| 26 | #include <linux/poll.h>
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| 27 | #include <linux/device.h>
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| 28 | #include <linux/mutex.h>
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| 29 | #include <linux/rcupdate.h>
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| 30 | #include "input-compat.h"
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| 31 |
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| 32 | MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
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| 33 | MODULE_DESCRIPTION("Input core");
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| 34 | MODULE_LICENSE("GPL");
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| 35 |
|
| 36 | #define INPUT_MAX_CHAR_DEVICES 1024
|
| 37 | #define INPUT_FIRST_DYNAMIC_DEV 256
|
| 38 | static DEFINE_IDA(input_ida);
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| 39 |
|
| 40 | static LIST_HEAD(input_dev_list);
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| 41 | static LIST_HEAD(input_handler_list);
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| 42 |
|
| 43 | |
| 44 | * input_mutex protects access to both input_dev_list and input_handler_list.
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| 45 | * This also causes input_[un]register_device and input_[un]register_handler
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| 46 | * be mutually exclusive which simplifies locking in drivers implementing
|
| 47 | * input handlers.
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| 48 |
|
| 49 | static DEFINE_MUTEX(input_mutex);
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| 50 |
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| 51 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
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| 52 |
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| 53 | static inline int is_event_supported(unsigned int code,
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| 54 | unsigned long *bm, unsigned int max)
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| 55 | {
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| 56 | return code <= max && test_bit(code, bm);
|
| 57 | }
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| 58 |
|
| 59 | static int input_defuzz_abs_event(int value, int old_val, int fuzz)
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| 60 | {
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| 61 | if (fuzz) {
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| 62 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
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| 63 | return old_val;
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| 64 |
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| 65 | if (value > old_val - fuzz && value < old_val + fuzz)
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| 66 | return (old_val * 3 + value) / 4;
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| 67 |
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| 68 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
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| 69 | return (old_val + value) / 2;
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| 70 | }
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| 71 |
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| 72 | return value;
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| 73 | }
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| 74 |
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| 75 | static void input_start_autorepeat(struct input_dev *dev, int code)
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| 76 | {
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| 77 | if (test_bit(EV_REP, dev->evbit) &&
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| 78 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
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| 79 | dev->timer.data) {
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| 80 | dev->repeat_key = code;
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| 81 | mod_timer(&dev->timer,
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| 82 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
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| 83 | }
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| 84 | }
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| 85 |
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| 86 | static void input_stop_autorepeat(struct input_dev *dev)
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| 87 | {
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| 88 | del_timer(&dev->timer);
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| 89 | }
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| 90 |
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| 91 | |
| 92 | * Pass event first through all filters and then, if event has not been
|
| 93 | * filtered out, through all open handles. This function is called with
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| 94 | * dev->event_lock held and interrupts disabled.
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| 95 |
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| 96 | static unsigned int input_to_handler(struct input_handle *handle,
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| 97 | struct input_value *vals, unsigned int count)
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| 98 | {
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| 99 | struct input_handler *handler = handle->handler;
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| 100 | struct input_value *end = vals;
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| 101 | struct input_value *v;
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| 102 |
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| 103 | for (v = vals; v != vals + count; v++) {
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| 104 | if (handler->filter &&
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| 105 | handler->filter(handle, v->type, v->code, v->value))
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| 106 | continue;
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| 107 | if (end != v)
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| 108 | *end = *v;
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| 109 | end++;
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| 110 | }
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| 111 |
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| 112 | count = end - vals;
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| 113 | if (!count)
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| 114 | return 0;
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| 115 |
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| 116 | if (handler->events)
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| 117 | handler->events(handle, vals, count);
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| 118 | else if (handler->event)
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| 119 | for (v = vals; v != end; v++)
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| 120 | handler->event(handle, v->type, v->code, v->value);
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| 121 |
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| 122 | return count;
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| 123 | }
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| 124 |
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| 125 | |
| 126 | * Pass values first through all filters and then, if event has not been
|
| 127 | * filtered out, through all open handles. This function is called with
|
| 128 | * dev->event_lock held and interrupts disabled.
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| 129 |
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| 130 | static void input_pass_values(struct input_dev *dev,
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| 131 | struct input_value *vals, unsigned int count)
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| 132 | {
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| 133 | struct input_handle *handle;
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| 134 | struct input_value *v;
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| 135 |
|
| 136 | if (!count)
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| 137 | return;
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| 138 |
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| 139 | rcu_read_lock();
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| 140 |
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| 141 | handle = rcu_dereference(dev->grab);
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| 142 | if (handle) {
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| 143 | count = input_to_handler(handle, vals, count);
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| 144 | } else {
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| 145 | list_for_each_entry_rcu(handle, &dev->h_list, d_node)
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| 146 | if (handle->open)
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| 147 | count = input_to_handler(handle, vals, count);
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| 148 | }
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| 149 |
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| 150 | rcu_read_unlock();
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| 151 |
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| 152 | add_input_randomness(vals->type, vals->code, vals->value);
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| 153 |
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| 154 |
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| 155 | for (v = vals; v != vals + count; v++) {
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| 156 | if (v->type == EV_KEY && v->value != 2) {
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| 157 | if (v->value)
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| 158 | input_start_autorepeat(dev, v->code);
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| 159 | else
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| 160 | input_stop_autorepeat(dev);
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| 161 | }
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| 162 | }
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| 163 | }
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| 164 |
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| 165 | static void input_pass_event(struct input_dev *dev,
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| 166 | unsigned int type, unsigned int code, int value)
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| 167 | {
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| 168 | struct input_value vals[] = { { type, code, value } };
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| 169 |
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| 170 | input_pass_values(dev, vals, ARRAY_SIZE(vals));
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| 171 | }
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| 172 |
|
| 173 | |
| 174 | * Generate software autorepeat event. Note that we take
|
| 175 | * dev->event_lock here to avoid racing with input_event
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| 176 | * which may cause keys get "stuck".
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| 177 |
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| 178 | static void input_repeat_key(unsigned long data)
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| 179 | {
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| 180 | struct input_dev *dev = (void *) data;
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| 181 | unsigned long flags;
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| 182 |
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| 183 | spin_lock_irqsave(&dev->event_lock, flags);
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| 184 |
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| 185 | if (test_bit(dev->repeat_key, dev->key) &&
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| 186 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
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| 187 | struct input_value vals[] = {
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| 188 | { EV_KEY, dev->repeat_key, 2 },
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| 189 | input_value_sync
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| 190 | };
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| 191 |
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| 192 | input_pass_values(dev, vals, ARRAY_SIZE(vals));
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| 193 |
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| 194 | if (dev->rep[REP_PERIOD])
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| 195 | mod_timer(&dev->timer, jiffies +
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| 196 | msecs_to_jiffies(dev->rep[REP_PERIOD]));
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| 197 | }
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| 198 |
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| 199 | spin_unlock_irqrestore(&dev->event_lock, flags);
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| 200 | }
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| 201 |
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| 202 | #define INPUT_IGNORE_EVENT 0
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| 203 | #define INPUT_PASS_TO_HANDLERS 1
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| 204 | #define INPUT_PASS_TO_DEVICE 2
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| 205 | #define INPUT_SLOT 4
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| 206 | #define INPUT_FLUSH 8
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| 207 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
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| 208 |
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| 209 | static int input_handle_abs_event(struct input_dev *dev,
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| 210 | unsigned int code, int *pval)
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| 211 | {
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| 212 | struct input_mt *mt = dev->mt;
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| 213 | bool is_mt_event;
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| 214 | int *pold;
|
| 215 |
|
| 216 | if (code == ABS_MT_SLOT) {
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| 217 | |
| 218 | * "Stage" the event; we'll flush it later, when we
|
| 219 | * get actual touch data.
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| 220 |
|
| 221 | if (mt && *pval >= 0 && *pval < mt->num_slots)
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| 222 | mt->slot = *pval;
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| 223 |
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| 224 | return INPUT_IGNORE_EVENT;
|
| 225 | }
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| 226 |
|
| 227 | is_mt_event = input_is_mt_value(code);
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| 228 |
|
| 229 | if (!is_mt_event) {
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| 230 | pold = &dev->absinfo[code].value;
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| 231 | } else if (mt) {
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| 232 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
|
| 233 | } else {
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| 234 | |
| 235 | * Bypass filtering for multi-touch events when
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| 236 | * not employing slots.
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| 237 |
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| 238 | pold = NULL;
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| 239 | }
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| 240 |
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| 241 | if (pold) {
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| 242 | *pval = input_defuzz_abs_event(*pval, *pold,
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| 243 | dev->absinfo[code].fuzz);
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| 244 | if (*pold == *pval)
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| 245 | return INPUT_IGNORE_EVENT;
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| 246 |
|
| 247 | *pold = *pval;
|
| 248 | }
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| 249 |
|
| 250 |
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| 251 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
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| 252 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
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| 253 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
|
| 254 | }
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| 255 |
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| 256 | return INPUT_PASS_TO_HANDLERS;
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| 257 | }
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| 258 |
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| 259 | static int input_get_disposition(struct input_dev *dev,
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| 260 | unsigned int type, unsigned int code, int value)
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| 261 | {
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| 262 | int disposition = INPUT_IGNORE_EVENT;
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| 263 |
|
| 264 | switch (type) {
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| 265 |
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| 266 | case EV_SYN:
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| 267 | switch (code) {
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| 268 | case SYN_CONFIG:
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| 269 | disposition = INPUT_PASS_TO_ALL;
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| 270 | break;
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| 271 |
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| 272 | case SYN_REPORT:
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| 273 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
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| 274 | break;
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| 275 | case SYN_MT_REPORT:
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| 276 | disposition = INPUT_PASS_TO_HANDLERS;
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| 277 | break;
|
| 278 | }
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| 279 | break;
|
| 280 |
|
| 281 | case EV_KEY:
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| 282 | if (is_event_supported(code, dev->keybit, KEY_MAX)) {
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| 283 |
|
| 284 |
|
| 285 | if (value == 2) {
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| 286 | disposition = INPUT_PASS_TO_HANDLERS;
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| 287 | break;
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| 288 | }
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| 289 |
|
| 290 | if (!!test_bit(code, dev->key) != !!value) {
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| 291 |
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| 292 | __change_bit(code, dev->key);
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| 293 | disposition = INPUT_PASS_TO_HANDLERS;
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| 294 | }
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| 295 | }
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| 296 | break;
|
| 297 |
|
| 298 | case EV_SW:
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| 299 | if (is_event_supported(code, dev->swbit, SW_MAX) &&
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| 300 | !!test_bit(code, dev->sw) != !!value) {
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| 301 |
|
| 302 | __change_bit(code, dev->sw);
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| 303 | disposition = INPUT_PASS_TO_HANDLERS;
|
| 304 | }
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| 305 | break;
|
| 306 |
|
| 307 | case EV_ABS:
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| 308 | if (is_event_supported(code, dev->absbit, ABS_MAX))
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| 309 | disposition = input_handle_abs_event(dev, code, &value);
|
| 310 |
|
| 311 | break;
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| 312 |
|
| 313 | case EV_REL:
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| 314 | if (is_event_supported(code, dev->relbit, REL_MAX) && value)
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| 315 | disposition = INPUT_PASS_TO_HANDLERS;
|
| 316 |
|
| 317 | break;
|
| 318 |
|
| 319 | case EV_MSC:
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| 320 | if (is_event_supported(code, dev->mscbit, MSC_MAX))
|
| 321 | disposition = INPUT_PASS_TO_ALL;
|
| 322 |
|
| 323 | break;
|
| 324 |
|
| 325 | case EV_LED:
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| 326 | if (is_event_supported(code, dev->ledbit, LED_MAX) &&
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| 327 | !!test_bit(code, dev->led) != !!value) {
|
| 328 |
|
| 329 | __change_bit(code, dev->led);
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| 330 | disposition = INPUT_PASS_TO_ALL;
|
| 331 | }
|
| 332 | break;
|
| 333 |
|
| 334 | case EV_SND:
|
| 335 | if (is_event_supported(code, dev->sndbit, SND_MAX)) {
|
| 336 |
|
| 337 | if (!!test_bit(code, dev->snd) != !!value)
|
| 338 | __change_bit(code, dev->snd);
|
| 339 | disposition = INPUT_PASS_TO_ALL;
|
| 340 | }
|
| 341 | break;
|
| 342 |
|
| 343 | case EV_REP:
|
| 344 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
|
| 345 | dev->rep[code] = value;
|
| 346 | disposition = INPUT_PASS_TO_ALL;
|
| 347 | }
|
| 348 | break;
|
| 349 |
|
| 350 | case EV_FF:
|
| 351 | if (value >= 0)
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| 352 | disposition = INPUT_PASS_TO_ALL;
|
| 353 | break;
|
| 354 |
|
| 355 | case EV_PWR:
|
| 356 | disposition = INPUT_PASS_TO_ALL;
|
| 357 | break;
|
| 358 | }
|
| 359 |
|
| 360 | return disposition;
|
| 361 | }
|
| 362 |
|
| 363 | static void input_handle_event(struct input_dev *dev,
|
| 364 | unsigned int type, unsigned int code, int value)
|
| 365 | {
|
| 366 | int disposition;
|
| 367 |
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| 368 | disposition = input_get_disposition(dev, type, code, value);
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| 369 |
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| 370 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
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| 371 | dev->event(dev, type, code, value);
|
| 372 |
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| 373 | if (!dev->vals)
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| 374 | return;
|
| 375 |
|
| 376 | if (disposition & INPUT_PASS_TO_HANDLERS) {
|
| 377 | struct input_value *v;
|
| 378 |
|
| 379 | if (disposition & INPUT_SLOT) {
|
| 380 | v = &dev->vals[dev->num_vals++];
|
| 381 | v->type = EV_ABS;
|
| 382 | v->code = ABS_MT_SLOT;
|
| 383 | v->value = dev->mt->slot;
|
| 384 | }
|
| 385 |
|
| 386 | v = &dev->vals[dev->num_vals++];
|
| 387 | v->type = type;
|
| 388 | v->code = code;
|
| 389 | v->value = value;
|
| 390 | }
|
| 391 |
|
| 392 | if (disposition & INPUT_FLUSH) {
|
| 393 | if (dev->num_vals >= 2)
|
| 394 | input_pass_values(dev, dev->vals, dev->num_vals);
|
| 395 | dev->num_vals = 0;
|
| 396 | } else if (dev->num_vals >= dev->max_vals - 2) {
|
| 397 | dev->vals[dev->num_vals++] = input_value_sync;
|
| 398 | input_pass_values(dev, dev->vals, dev->num_vals);
|
| 399 | dev->num_vals = 0;
|
| 400 | }
|
| 401 |
|
| 402 | }
|
| 403 |
|
| 404 | |
| 405 | * input_event() - report new input event
|
| 406 | * @dev: device that generated the event
|
| 407 | * @type: type of the event
|
| 408 | * @code: event code
|
| 409 | * @value: value of the event
|
| 410 | *
|
| 411 | * This function should be used by drivers implementing various input
|
| 412 | * devices to report input events. See also input_inject_event().
|
| 413 | *
|
| 414 | * NOTE: input_event() may be safely used right after input device was
|
| 415 | * allocated with input_allocate_device(), even before it is registered
|
| 416 | * with input_register_device(), but the event will not reach any of the
|
| 417 | * input handlers. Such early invocation of input_event() may be used
|
| 418 | * to 'seed' initial state of a switch or initial position of absolute
|
| 419 | * axis, etc.
|
| 420 |
|
| 421 | void input_event(struct input_dev *dev,
|
| 422 | unsigned int type, unsigned int code, int value)
|
| 423 | {
|
| 424 | unsigned long flags;
|
| 425 |
|
| 426 | if (is_event_supported(type, dev->evbit, EV_MAX)) {
|
| 427 |
|
| 428 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 429 | input_handle_event(dev, type, code, value);
|
| 430 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 431 | }
|
| 432 | }
|
| 433 | EXPORT_SYMBOL(input_event);
|
| 434 |
|
| 435 | |
| 436 | * input_inject_event() - send input event from input handler
|
| 437 | * @handle: input handle to send event through
|
| 438 | * @type: type of the event
|
| 439 | * @code: event code
|
| 440 | * @value: value of the event
|
| 441 | *
|
| 442 | * Similar to input_event() but will ignore event if device is
|
| 443 | * "grabbed" and handle injecting event is not the one that owns
|
| 444 | * the device.
|
| 445 |
|
| 446 | void input_inject_event(struct input_handle *handle,
|
| 447 | unsigned int type, unsigned int code, int value)
|
| 448 | {
|
| 449 | struct input_dev *dev = handle->dev;
|
| 450 | struct input_handle *grab;
|
| 451 | unsigned long flags;
|
| 452 |
|
| 453 | if (is_event_supported(type, dev->evbit, EV_MAX)) {
|
| 454 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 455 |
|
| 456 | rcu_read_lock();
|
| 457 | grab = rcu_dereference(dev->grab);
|
| 458 | if (!grab || grab == handle)
|
| 459 | input_handle_event(dev, type, code, value);
|
| 460 | rcu_read_unlock();
|
| 461 |
|
| 462 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 463 | }
|
| 464 | }
|
| 465 | EXPORT_SYMBOL(input_inject_event);
|
| 466 |
|
| 467 | |
| 468 | * input_alloc_absinfo - allocates array of input_absinfo structs
|
| 469 | * @dev: the input device emitting absolute events
|
| 470 | *
|
| 471 | * If the absinfo struct the caller asked for is already allocated, this
|
| 472 | * functions will not do anything.
|
| 473 |
|
| 474 | void input_alloc_absinfo(struct input_dev *dev)
|
| 475 | {
|
| 476 | if (!dev->absinfo)
|
| 477 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
|
| 478 | GFP_KERNEL);
|
| 479 |
|
| 480 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
|
| 481 | }
|
| 482 | EXPORT_SYMBOL(input_alloc_absinfo);
|
| 483 |
|
| 484 | void input_set_abs_params(struct input_dev *dev, unsigned int axis,
|
| 485 | int min, int max, int fuzz, int flat)
|
| 486 | {
|
| 487 | struct input_absinfo *absinfo;
|
| 488 |
|
| 489 | input_alloc_absinfo(dev);
|
| 490 | if (!dev->absinfo)
|
| 491 | return;
|
| 492 |
|
| 493 | absinfo = &dev->absinfo[axis];
|
| 494 | absinfo->minimum = min;
|
| 495 | absinfo->maximum = max;
|
| 496 | absinfo->fuzz = fuzz;
|
| 497 | absinfo->flat = flat;
|
| 498 |
|
| 499 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
|
| 500 | }
|
| 501 | EXPORT_SYMBOL(input_set_abs_params);
|
| 502 |
|
| 503 |
|
| 504 | |
| 505 | * input_grab_device - grabs device for exclusive use
|
| 506 | * @handle: input handle that wants to own the device
|
| 507 | *
|
| 508 | * When a device is grabbed by an input handle all events generated by
|
| 509 | * the device are delivered only to this handle. Also events injected
|
| 510 | * by other input handles are ignored while device is grabbed.
|
| 511 |
|
| 512 | int input_grab_device(struct input_handle *handle)
|
| 513 | {
|
| 514 | struct input_dev *dev = handle->dev;
|
| 515 | int retval;
|
| 516 |
|
| 517 | retval = mutex_lock_interruptible(&dev->mutex);
|
| 518 | if (retval)
|
| 519 | return retval;
|
| 520 |
|
| 521 | if (dev->grab) {
|
| 522 | retval = -EBUSY;
|
| 523 | goto out;
|
| 524 | }
|
| 525 |
|
| 526 | rcu_assign_pointer(dev->grab, handle);
|
| 527 |
|
| 528 | out:
|
| 529 | mutex_unlock(&dev->mutex);
|
| 530 | return retval;
|
| 531 | }
|
| 532 | EXPORT_SYMBOL(input_grab_device);
|
| 533 |
|
| 534 | static void __input_release_device(struct input_handle *handle)
|
| 535 | {
|
| 536 | struct input_dev *dev = handle->dev;
|
| 537 | struct input_handle *grabber;
|
| 538 |
|
| 539 | grabber = rcu_dereference_protected(dev->grab,
|
| 540 | lockdep_is_held(&dev->mutex));
|
| 541 | if (grabber == handle) {
|
| 542 | rcu_assign_pointer(dev->grab, NULL);
|
| 543 |
|
| 544 | synchronize_rcu();
|
| 545 |
|
| 546 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 547 | if (handle->open && handle->handler->start)
|
| 548 | handle->handler->start(handle);
|
| 549 | }
|
| 550 | }
|
| 551 |
|
| 552 | |
| 553 | * input_release_device - release previously grabbed device
|
| 554 | * @handle: input handle that owns the device
|
| 555 | *
|
| 556 | * Releases previously grabbed device so that other input handles can
|
| 557 | * start receiving input events. Upon release all handlers attached
|
| 558 | * to the device have their start() method called so they have a change
|
| 559 | * to synchronize device state with the rest of the system.
|
| 560 |
|
| 561 | void input_release_device(struct input_handle *handle)
|
| 562 | {
|
| 563 | struct input_dev *dev = handle->dev;
|
| 564 |
|
| 565 | mutex_lock(&dev->mutex);
|
| 566 | __input_release_device(handle);
|
| 567 | mutex_unlock(&dev->mutex);
|
| 568 | }
|
| 569 | EXPORT_SYMBOL(input_release_device);
|
| 570 |
|
| 571 | |
| 572 | * input_open_device - open input device
|
| 573 | * @handle: handle through which device is being accessed
|
| 574 | *
|
| 575 | * This function should be called by input handlers when they
|
| 576 | * want to start receive events from given input device.
|
| 577 |
|
| 578 | int input_open_device(struct input_handle *handle)
|
| 579 | {
|
| 580 | struct input_dev *dev = handle->dev;
|
| 581 | int retval;
|
| 582 |
|
| 583 | retval = mutex_lock_interruptible(&dev->mutex);
|
| 584 | if (retval)
|
| 585 | return retval;
|
| 586 |
|
| 587 | if (dev->going_away) {
|
| 588 | retval = -ENODEV;
|
| 589 | goto out;
|
| 590 | }
|
| 591 |
|
| 592 | handle->open++;
|
| 593 |
|
| 594 | if (!dev->users++ && dev->open)
|
| 595 | retval = dev->open(dev);
|
| 596 |
|
| 597 | if (retval) {
|
| 598 | dev->users--;
|
| 599 | if (!--handle->open) {
|
| 600 | |
| 601 | * Make sure we are not delivering any more events
|
| 602 | * through this handle
|
| 603 |
|
| 604 | synchronize_rcu();
|
| 605 | }
|
| 606 | }
|
| 607 |
|
| 608 | out:
|
| 609 | mutex_unlock(&dev->mutex);
|
| 610 | return retval;
|
| 611 | }
|
| 612 | EXPORT_SYMBOL(input_open_device);
|
| 613 |
|
| 614 | int input_flush_device(struct input_handle *handle, struct file *file)
|
| 615 | {
|
| 616 | struct input_dev *dev = handle->dev;
|
| 617 | int retval;
|
| 618 |
|
| 619 | retval = mutex_lock_interruptible(&dev->mutex);
|
| 620 | if (retval)
|
| 621 | return retval;
|
| 622 |
|
| 623 | if (dev->flush)
|
| 624 | retval = dev->flush(dev, file);
|
| 625 |
|
| 626 | mutex_unlock(&dev->mutex);
|
| 627 | return retval;
|
| 628 | }
|
| 629 | EXPORT_SYMBOL(input_flush_device);
|
| 630 |
|
| 631 | |
| 632 | * input_close_device - close input device
|
| 633 | * @handle: handle through which device is being accessed
|
| 634 | *
|
| 635 | * This function should be called by input handlers when they
|
| 636 | * want to stop receive events from given input device.
|
| 637 |
|
| 638 | void input_close_device(struct input_handle *handle)
|
| 639 | {
|
| 640 | struct input_dev *dev = handle->dev;
|
| 641 |
|
| 642 | mutex_lock(&dev->mutex);
|
| 643 |
|
| 644 | __input_release_device(handle);
|
| 645 |
|
| 646 | if (!--dev->users && dev->close)
|
| 647 | dev->close(dev);
|
| 648 |
|
| 649 | if (!--handle->open) {
|
| 650 | |
| 651 | * synchronize_rcu() makes sure that input_pass_event()
|
| 652 | * completed and that no more input events are delivered
|
| 653 | * through this handle
|
| 654 |
|
| 655 | synchronize_rcu();
|
| 656 | }
|
| 657 |
|
| 658 | mutex_unlock(&dev->mutex);
|
| 659 | }
|
| 660 | EXPORT_SYMBOL(input_close_device);
|
| 661 |
|
| 662 | |
| 663 | * Simulate keyup events for all keys that are marked as pressed.
|
| 664 | * The function must be called with dev->event_lock held.
|
| 665 |
|
| 666 | static void input_dev_release_keys(struct input_dev *dev)
|
| 667 | {
|
| 668 | int code;
|
| 669 |
|
| 670 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
|
| 671 | for (code = 0; code <= KEY_MAX; code++) {
|
| 672 | if (is_event_supported(code, dev->keybit, KEY_MAX) &&
|
| 673 | __test_and_clear_bit(code, dev->key)) {
|
| 674 | input_pass_event(dev, EV_KEY, code, 0);
|
| 675 | }
|
| 676 | }
|
| 677 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
|
| 678 | }
|
| 679 | }
|
| 680 |
|
| 681 | |
| 682 | * Prepare device for unregistering
|
| 683 |
|
| 684 | static void input_disconnect_device(struct input_dev *dev)
|
| 685 | {
|
| 686 | struct input_handle *handle;
|
| 687 |
|
| 688 | |
| 689 | * Mark device as going away. Note that we take dev->mutex here
|
| 690 | * not to protect access to dev->going_away but rather to ensure
|
| 691 | * that there are no threads in the middle of input_open_device()
|
| 692 |
|
| 693 | mutex_lock(&dev->mutex);
|
| 694 | dev->going_away = true;
|
| 695 | mutex_unlock(&dev->mutex);
|
| 696 |
|
| 697 | spin_lock_irq(&dev->event_lock);
|
| 698 |
|
| 699 | |
| 700 | * Simulate keyup events for all pressed keys so that handlers
|
| 701 | * are not left with "stuck" keys. The driver may continue
|
| 702 | * generate events even after we done here but they will not
|
| 703 | * reach any handlers.
|
| 704 |
|
| 705 | input_dev_release_keys(dev);
|
| 706 |
|
| 707 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 708 | handle->open = 0;
|
| 709 |
|
| 710 | spin_unlock_irq(&dev->event_lock);
|
| 711 | }
|
| 712 |
|
| 713 | |
| 714 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
|
| 715 | * @ke: keymap entry containing scancode to be converted.
|
| 716 | * @scancode: pointer to the location where converted scancode should
|
| 717 | * be stored.
|
| 718 | *
|
| 719 | * This function is used to convert scancode stored in &struct keymap_entry
|
| 720 | * into scalar form understood by legacy keymap handling methods. These
|
| 721 | * methods expect scancodes to be represented as 'unsigned int'.
|
| 722 |
|
| 723 | int input_scancode_to_scalar(const struct input_keymap_entry *ke,
|
| 724 | unsigned int *scancode)
|
| 725 | {
|
| 726 | switch (ke->len) {
|
| 727 | case 1:
|
| 728 | *scancode = *((u8 *)ke->scancode);
|
| 729 | break;
|
| 730 |
|
| 731 | case 2:
|
| 732 | *scancode = *((u16 *)ke->scancode);
|
| 733 | break;
|
| 734 |
|
| 735 | case 4:
|
| 736 | *scancode = *((u32 *)ke->scancode);
|
| 737 | break;
|
| 738 |
|
| 739 | default:
|
| 740 | return -EINVAL;
|
| 741 | }
|
| 742 |
|
| 743 | return 0;
|
| 744 | }
|
| 745 | EXPORT_SYMBOL(input_scancode_to_scalar);
|
| 746 |
|
| 747 | |
| 748 | * Those routines handle the default case where no [gs]etkeycode() is
|
| 749 | * defined. In this case, an array indexed by the scancode is used.
|
| 750 |
|
| 751 |
|
| 752 | static unsigned int input_fetch_keycode(struct input_dev *dev,
|
| 753 | unsigned int index)
|
| 754 | {
|
| 755 | switch (dev->keycodesize) {
|
| 756 | case 1:
|
| 757 | return ((u8 *)dev->keycode)[index];
|
| 758 |
|
| 759 | case 2:
|
| 760 | return ((u16 *)dev->keycode)[index];
|
| 761 |
|
| 762 | default:
|
| 763 | return ((u32 *)dev->keycode)[index];
|
| 764 | }
|
| 765 | }
|
| 766 |
|
| 767 | static int input_default_getkeycode(struct input_dev *dev,
|
| 768 | struct input_keymap_entry *ke)
|
| 769 | {
|
| 770 | unsigned int index;
|
| 771 | int error;
|
| 772 |
|
| 773 | if (!dev->keycodesize)
|
| 774 | return -EINVAL;
|
| 775 |
|
| 776 | if (ke->flags & INPUT_KEYMAP_BY_INDEX)
|
| 777 | index = ke->index;
|
| 778 | else {
|
| 779 | error = input_scancode_to_scalar(ke, &index);
|
| 780 | if (error)
|
| 781 | return error;
|
| 782 | }
|
| 783 |
|
| 784 | if (index >= dev->keycodemax)
|
| 785 | return -EINVAL;
|
| 786 |
|
| 787 | ke->keycode = input_fetch_keycode(dev, index);
|
| 788 | ke->index = index;
|
| 789 | ke->len = sizeof(index);
|
| 790 | memcpy(ke->scancode, &index, sizeof(index));
|
| 791 |
|
| 792 | return 0;
|
| 793 | }
|
| 794 |
|
| 795 | static int input_default_setkeycode(struct input_dev *dev,
|
| 796 | const struct input_keymap_entry *ke,
|
| 797 | unsigned int *old_keycode)
|
| 798 | {
|
| 799 | unsigned int index;
|
| 800 | int error;
|
| 801 | int i;
|
| 802 |
|
| 803 | if (!dev->keycodesize)
|
| 804 | return -EINVAL;
|
| 805 |
|
| 806 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
|
| 807 | index = ke->index;
|
| 808 | } else {
|
| 809 | error = input_scancode_to_scalar(ke, &index);
|
| 810 | if (error)
|
| 811 | return error;
|
| 812 | }
|
| 813 |
|
| 814 | if (index >= dev->keycodemax)
|
| 815 | return -EINVAL;
|
| 816 |
|
| 817 | if (dev->keycodesize < sizeof(ke->keycode) &&
|
| 818 | (ke->keycode >> (dev->keycodesize * 8)))
|
| 819 | return -EINVAL;
|
| 820 |
|
| 821 | switch (dev->keycodesize) {
|
| 822 | case 1: {
|
| 823 | u8 *k = (u8 *)dev->keycode;
|
| 824 | *old_keycode = k[index];
|
| 825 | k[index] = ke->keycode;
|
| 826 | break;
|
| 827 | }
|
| 828 | case 2: {
|
| 829 | u16 *k = (u16 *)dev->keycode;
|
| 830 | *old_keycode = k[index];
|
| 831 | k[index] = ke->keycode;
|
| 832 | break;
|
| 833 | }
|
| 834 | default: {
|
| 835 | u32 *k = (u32 *)dev->keycode;
|
| 836 | *old_keycode = k[index];
|
| 837 | k[index] = ke->keycode;
|
| 838 | break;
|
| 839 | }
|
| 840 | }
|
| 841 |
|
| 842 | __clear_bit(*old_keycode, dev->keybit);
|
| 843 | __set_bit(ke->keycode, dev->keybit);
|
| 844 |
|
| 845 | for (i = 0; i < dev->keycodemax; i++) {
|
| 846 | if (input_fetch_keycode(dev, i) == *old_keycode) {
|
| 847 | __set_bit(*old_keycode, dev->keybit);
|
| 848 | break;
|
| 849 | }
|
| 850 | }
|
| 851 |
|
| 852 | return 0;
|
| 853 | }
|
| 854 |
|
| 855 | |
| 856 | * input_get_keycode - retrieve keycode currently mapped to a given scancode
|
| 857 | * @dev: input device which keymap is being queried
|
| 858 | * @ke: keymap entry
|
| 859 | *
|
| 860 | * This function should be called by anyone interested in retrieving current
|
| 861 | * keymap. Presently evdev handlers use it.
|
| 862 |
|
| 863 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
|
| 864 | {
|
| 865 | unsigned long flags;
|
| 866 | int retval;
|
| 867 |
|
| 868 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 869 | retval = dev->getkeycode(dev, ke);
|
| 870 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 871 |
|
| 872 | return retval;
|
| 873 | }
|
| 874 | EXPORT_SYMBOL(input_get_keycode);
|
| 875 |
|
| 876 | |
| 877 | * input_set_keycode - attribute a keycode to a given scancode
|
| 878 | * @dev: input device which keymap is being updated
|
| 879 | * @ke: new keymap entry
|
| 880 | *
|
| 881 | * This function should be called by anyone needing to update current
|
| 882 | * keymap. Presently keyboard and evdev handlers use it.
|
| 883 |
|
| 884 | int input_set_keycode(struct input_dev *dev,
|
| 885 | const struct input_keymap_entry *ke)
|
| 886 | {
|
| 887 | unsigned long flags;
|
| 888 | unsigned int old_keycode;
|
| 889 | int retval;
|
| 890 |
|
| 891 | if (ke->keycode > KEY_MAX)
|
| 892 | return -EINVAL;
|
| 893 |
|
| 894 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 895 |
|
| 896 | retval = dev->setkeycode(dev, ke, &old_keycode);
|
| 897 | if (retval)
|
| 898 | goto out;
|
| 899 |
|
| 900 |
|
| 901 | __clear_bit(KEY_RESERVED, dev->keybit);
|
| 902 |
|
| 903 | |
| 904 | * Simulate keyup event if keycode is not present
|
| 905 | * in the keymap anymore
|
| 906 |
|
| 907 | if (test_bit(EV_KEY, dev->evbit) &&
|
| 908 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
|
| 909 | __test_and_clear_bit(old_keycode, dev->key)) {
|
| 910 | struct input_value vals[] = {
|
| 911 | { EV_KEY, old_keycode, 0 },
|
| 912 | input_value_sync
|
| 913 | };
|
| 914 |
|
| 915 | input_pass_values(dev, vals, ARRAY_SIZE(vals));
|
| 916 | }
|
| 917 |
|
| 918 | out:
|
| 919 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 920 |
|
| 921 | return retval;
|
| 922 | }
|
| 923 | EXPORT_SYMBOL(input_set_keycode);
|
| 924 |
|
| 925 | static const struct input_device_id *input_match_device(struct input_handler *handler,
|
| 926 | struct input_dev *dev)
|
| 927 | {
|
| 928 | const struct input_device_id *id;
|
| 929 |
|
| 930 | for (id = handler->id_table; id->flags || id->driver_info; id++) {
|
| 931 |
|
| 932 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
|
| 933 | if (id->bustype != dev->id.bustype)
|
| 934 | continue;
|
| 935 |
|
| 936 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
|
| 937 | if (id->vendor != dev->id.vendor)
|
| 938 | continue;
|
| 939 |
|
| 940 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
|
| 941 | if (id->product != dev->id.product)
|
| 942 | continue;
|
| 943 |
|
| 944 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
|
| 945 | if (id->version != dev->id.version)
|
| 946 | continue;
|
| 947 |
|
| 948 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
|
| 949 | continue;
|
| 950 |
|
| 951 | if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
|
| 952 | continue;
|
| 953 |
|
| 954 | if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
|
| 955 | continue;
|
| 956 |
|
| 957 | if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
|
| 958 | continue;
|
| 959 |
|
| 960 | if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
|
| 961 | continue;
|
| 962 |
|
| 963 | if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
|
| 964 | continue;
|
| 965 |
|
| 966 | if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
|
| 967 | continue;
|
| 968 |
|
| 969 | if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
|
| 970 | continue;
|
| 971 |
|
| 972 | if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
|
| 973 | continue;
|
| 974 |
|
| 975 | if (!handler->match || handler->match(handler, dev))
|
| 976 | return id;
|
| 977 | }
|
| 978 |
|
| 979 | return NULL;
|
| 980 | }
|
| 981 |
|
| 982 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
|
| 983 | {
|
| 984 | const struct input_device_id *id;
|
| 985 | int error;
|
| 986 |
|
| 987 | id = input_match_device(handler, dev);
|
| 988 | if (!id)
|
| 989 | return -ENODEV;
|
| 990 |
|
| 991 | error = handler->connect(handler, dev, id);
|
| 992 | if (error && error != -ENODEV)
|
| 993 | pr_err("failed to attach handler %s to device %s, error: %d\n",
|
| 994 | handler->name, kobject_name(&dev->dev.kobj), error);
|
| 995 |
|
| 996 | return error;
|
| 997 | }
|
| 998 |
|
| 999 | #ifdef CONFIG_COMPAT
|
| 1000 |
|
| 1001 | static int input_bits_to_string(char *buf, int buf_size,
|
| 1002 | unsigned long bits, bool skip_empty)
|
| 1003 | {
|
| 1004 | int len = 0;
|
| 1005 |
|
| 1006 | if (INPUT_COMPAT_TEST) {
|
| 1007 | u32 dword = bits >> 32;
|
| 1008 | if (dword || !skip_empty)
|
| 1009 | len += snprintf(buf, buf_size, "%x ", dword);
|
| 1010 |
|
| 1011 | dword = bits & 0xffffffffUL;
|
| 1012 | if (dword || !skip_empty || len)
|
| 1013 | len += snprintf(buf + len, max(buf_size - len, 0),
|
| 1014 | "%x", dword);
|
| 1015 | } else {
|
| 1016 | if (bits || !skip_empty)
|
| 1017 | len += snprintf(buf, buf_size, "%lx", bits);
|
| 1018 | }
|
| 1019 |
|
| 1020 | return len;
|
| 1021 | }
|
| 1022 |
|
| 1023 | #else
|
| 1024 |
|
| 1025 | static int input_bits_to_string(char *buf, int buf_size,
|
| 1026 | unsigned long bits, bool skip_empty)
|
| 1027 | {
|
| 1028 | return bits || !skip_empty ?
|
| 1029 | snprintf(buf, buf_size, "%lx", bits) : 0;
|
| 1030 | }
|
| 1031 |
|
| 1032 | #endif
|
| 1033 |
|
| 1034 | #ifdef CONFIG_PROC_FS
|
| 1035 |
|
| 1036 | static struct proc_dir_entry *proc_bus_input_dir;
|
| 1037 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
|
| 1038 | static int input_devices_state;
|
| 1039 |
|
| 1040 | static inline void input_wakeup_procfs_readers(void)
|
| 1041 | {
|
| 1042 | input_devices_state++;
|
| 1043 | wake_up(&input_devices_poll_wait);
|
| 1044 | }
|
| 1045 |
|
| 1046 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
|
| 1047 | {
|
| 1048 | poll_wait(file, &input_devices_poll_wait, wait);
|
| 1049 | if (file->f_version != input_devices_state) {
|
| 1050 | file->f_version = input_devices_state;
|
| 1051 | return POLLIN | POLLRDNORM;
|
| 1052 | }
|
| 1053 |
|
| 1054 | return 0;
|
| 1055 | }
|
| 1056 |
|
| 1057 | union input_seq_state {
|
| 1058 | struct {
|
| 1059 | unsigned short pos;
|
| 1060 | bool mutex_acquired;
|
| 1061 | };
|
| 1062 | void *p;
|
| 1063 | };
|
| 1064 |
|
| 1065 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
|
| 1066 | {
|
| 1067 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1068 | int error;
|
| 1069 |
|
| 1070 |
|
| 1071 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
|
| 1072 |
|
| 1073 | error = mutex_lock_interruptible(&input_mutex);
|
| 1074 | if (error) {
|
| 1075 | state->mutex_acquired = false;
|
| 1076 | return ERR_PTR(error);
|
| 1077 | }
|
| 1078 |
|
| 1079 | state->mutex_acquired = true;
|
| 1080 |
|
| 1081 | return seq_list_start(&input_dev_list, *pos);
|
| 1082 | }
|
| 1083 |
|
| 1084 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 1085 | {
|
| 1086 | return seq_list_next(v, &input_dev_list, pos);
|
| 1087 | }
|
| 1088 |
|
| 1089 | static void input_seq_stop(struct seq_file *seq, void *v)
|
| 1090 | {
|
| 1091 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1092 |
|
| 1093 | if (state->mutex_acquired)
|
| 1094 | mutex_unlock(&input_mutex);
|
| 1095 | }
|
| 1096 |
|
| 1097 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
|
| 1098 | unsigned long *bitmap, int max)
|
| 1099 | {
|
| 1100 | int i;
|
| 1101 | bool skip_empty = true;
|
| 1102 | char buf[18];
|
| 1103 |
|
| 1104 | seq_printf(seq, "B: %s=", name);
|
| 1105 |
|
| 1106 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
|
| 1107 | if (input_bits_to_string(buf, sizeof(buf),
|
| 1108 | bitmap[i], skip_empty)) {
|
| 1109 | skip_empty = false;
|
| 1110 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
|
| 1111 | }
|
| 1112 | }
|
| 1113 |
|
| 1114 | |
| 1115 | * If no output was produced print a single 0.
|
| 1116 |
|
| 1117 | if (skip_empty)
|
| 1118 | seq_puts(seq, "0");
|
| 1119 |
|
| 1120 | seq_putc(seq, '\n');
|
| 1121 | }
|
| 1122 |
|
| 1123 | static int input_devices_seq_show(struct seq_file *seq, void *v)
|
| 1124 | {
|
| 1125 | struct input_dev *dev = container_of(v, struct input_dev, node);
|
| 1126 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
| 1127 | struct input_handle *handle;
|
| 1128 |
|
| 1129 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
|
| 1130 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
|
| 1131 |
|
| 1132 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
|
| 1133 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
|
| 1134 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
|
| 1135 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
|
| 1136 | seq_printf(seq, "H: Handlers=");
|
| 1137 |
|
| 1138 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 1139 | seq_printf(seq, "%s ", handle->name);
|
| 1140 | seq_putc(seq, '\n');
|
| 1141 |
|
| 1142 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
|
| 1143 |
|
| 1144 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
|
| 1145 | if (test_bit(EV_KEY, dev->evbit))
|
| 1146 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
|
| 1147 | if (test_bit(EV_REL, dev->evbit))
|
| 1148 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
|
| 1149 | if (test_bit(EV_ABS, dev->evbit))
|
| 1150 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
|
| 1151 | if (test_bit(EV_MSC, dev->evbit))
|
| 1152 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
|
| 1153 | if (test_bit(EV_LED, dev->evbit))
|
| 1154 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
|
| 1155 | if (test_bit(EV_SND, dev->evbit))
|
| 1156 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
|
| 1157 | if (test_bit(EV_FF, dev->evbit))
|
| 1158 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
|
| 1159 | if (test_bit(EV_SW, dev->evbit))
|
| 1160 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
|
| 1161 |
|
| 1162 | seq_putc(seq, '\n');
|
| 1163 |
|
| 1164 | kfree(path);
|
| 1165 | return 0;
|
| 1166 | }
|
| 1167 |
|
| 1168 | static const struct seq_operations input_devices_seq_ops = {
|
| 1169 | .start = input_devices_seq_start,
|
| 1170 | .next = input_devices_seq_next,
|
| 1171 | .stop = input_seq_stop,
|
| 1172 | .show = input_devices_seq_show,
|
| 1173 | };
|
| 1174 |
|
| 1175 | static int input_proc_devices_open(struct inode *inode, struct file *file)
|
| 1176 | {
|
| 1177 | return seq_open(file, &input_devices_seq_ops);
|
| 1178 | }
|
| 1179 |
|
| 1180 | static const struct file_operations input_devices_fileops = {
|
| 1181 | .owner = THIS_MODULE,
|
| 1182 | .open = input_proc_devices_open,
|
| 1183 | .poll = input_proc_devices_poll,
|
| 1184 | .read = seq_read,
|
| 1185 | .llseek = seq_lseek,
|
| 1186 | .release = seq_release,
|
| 1187 | };
|
| 1188 |
|
| 1189 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
|
| 1190 | {
|
| 1191 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1192 | int error;
|
| 1193 |
|
| 1194 |
|
| 1195 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
|
| 1196 |
|
| 1197 | error = mutex_lock_interruptible(&input_mutex);
|
| 1198 | if (error) {
|
| 1199 | state->mutex_acquired = false;
|
| 1200 | return ERR_PTR(error);
|
| 1201 | }
|
| 1202 |
|
| 1203 | state->mutex_acquired = true;
|
| 1204 | state->pos = *pos;
|
| 1205 |
|
| 1206 | return seq_list_start(&input_handler_list, *pos);
|
| 1207 | }
|
| 1208 |
|
| 1209 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 1210 | {
|
| 1211 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1212 |
|
| 1213 | state->pos = *pos + 1;
|
| 1214 | return seq_list_next(v, &input_handler_list, pos);
|
| 1215 | }
|
| 1216 |
|
| 1217 | static int input_handlers_seq_show(struct seq_file *seq, void *v)
|
| 1218 | {
|
| 1219 | struct input_handler *handler = container_of(v, struct input_handler, node);
|
| 1220 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1221 |
|
| 1222 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
|
| 1223 | if (handler->filter)
|
| 1224 | seq_puts(seq, " (filter)");
|
| 1225 | if (handler->legacy_minors)
|
| 1226 | seq_printf(seq, " Minor=%d", handler->minor);
|
| 1227 | seq_putc(seq, '\n');
|
| 1228 |
|
| 1229 | return 0;
|
| 1230 | }
|
| 1231 |
|
| 1232 | static const struct seq_operations input_handlers_seq_ops = {
|
| 1233 | .start = input_handlers_seq_start,
|
| 1234 | .next = input_handlers_seq_next,
|
| 1235 | .stop = input_seq_stop,
|
| 1236 | .show = input_handlers_seq_show,
|
| 1237 | };
|
| 1238 |
|
| 1239 | static int input_proc_handlers_open(struct inode *inode, struct file *file)
|
| 1240 | {
|
| 1241 | return seq_open(file, &input_handlers_seq_ops);
|
| 1242 | }
|
| 1243 |
|
| 1244 | static const struct file_operations input_handlers_fileops = {
|
| 1245 | .owner = THIS_MODULE,
|
| 1246 | .open = input_proc_handlers_open,
|
| 1247 | .read = seq_read,
|
| 1248 | .llseek = seq_lseek,
|
| 1249 | .release = seq_release,
|
| 1250 | };
|
| 1251 |
|
| 1252 | static int __init input_proc_init(void)
|
| 1253 | {
|
| 1254 | struct proc_dir_entry *entry;
|
| 1255 |
|
| 1256 | proc_bus_input_dir = proc_mkdir("bus/input", NULL);
|
| 1257 | if (!proc_bus_input_dir)
|
| 1258 | return -ENOMEM;
|
| 1259 |
|
| 1260 | entry = proc_create("devices", 0, proc_bus_input_dir,
|
| 1261 | &input_devices_fileops);
|
| 1262 | if (!entry)
|
| 1263 | goto fail1;
|
| 1264 |
|
| 1265 | entry = proc_create("handlers", 0, proc_bus_input_dir,
|
| 1266 | &input_handlers_fileops);
|
| 1267 | if (!entry)
|
| 1268 | goto fail2;
|
| 1269 |
|
| 1270 | return 0;
|
| 1271 |
|
| 1272 | fail2: remove_proc_entry("devices", proc_bus_input_dir);
|
| 1273 | fail1: remove_proc_entry("bus/input", NULL);
|
| 1274 | return -ENOMEM;
|
| 1275 | }
|
| 1276 |
|
| 1277 | static void input_proc_exit(void)
|
| 1278 | {
|
| 1279 | remove_proc_entry("devices", proc_bus_input_dir);
|
| 1280 | remove_proc_entry("handlers", proc_bus_input_dir);
|
| 1281 | remove_proc_entry("bus/input", NULL);
|
| 1282 | }
|
| 1283 |
|
| 1284 | #else
|
| 1285 | static inline void input_wakeup_procfs_readers(void) { }
|
| 1286 | static inline int input_proc_init(void) { return 0; }
|
| 1287 | static inline void input_proc_exit(void) { }
|
| 1288 | #endif
|
| 1289 |
|
| 1290 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \
|
| 1291 | static ssize_t input_dev_show_##name(struct device *dev, \
|
| 1292 | struct device_attribute *attr, \
|
| 1293 | char *buf) \
|
| 1294 | { \
|
| 1295 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1296 | \
|
| 1297 | return scnprintf(buf, PAGE_SIZE, "%s\n", \
|
| 1298 | input_dev->name ? input_dev->name : ""); \
|
| 1299 | } \
|
| 1300 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
|
| 1301 |
|
| 1302 | INPUT_DEV_STRING_ATTR_SHOW(name);
|
| 1303 | INPUT_DEV_STRING_ATTR_SHOW(phys);
|
| 1304 | INPUT_DEV_STRING_ATTR_SHOW(uniq);
|
| 1305 |
|
| 1306 | static int input_print_modalias_bits(char *buf, int size,
|
| 1307 | char name, unsigned long *bm,
|
| 1308 | unsigned int min_bit, unsigned int max_bit)
|
| 1309 | {
|
| 1310 | int len = 0, i;
|
| 1311 |
|
| 1312 | len += snprintf(buf, max(size, 0), "%c", name);
|
| 1313 | for (i = min_bit; i < max_bit; i++)
|
| 1314 | if (bm[BIT_WORD(i)] & BIT_MASK(i))
|
| 1315 | len += snprintf(buf + len, max(size - len, 0), "%X,", i);
|
| 1316 | return len;
|
| 1317 | }
|
| 1318 |
|
| 1319 | static int input_print_modalias(char *buf, int size, struct input_dev *id,
|
| 1320 | int add_cr)
|
| 1321 | {
|
| 1322 | int len;
|
| 1323 |
|
| 1324 | len = snprintf(buf, max(size, 0),
|
| 1325 | "input:b%04Xv%04Xp%04Xe%04X-",
|
| 1326 | id->id.bustype, id->id.vendor,
|
| 1327 | id->id.product, id->id.version);
|
| 1328 |
|
| 1329 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1330 | 'e', id->evbit, 0, EV_MAX);
|
| 1331 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1332 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
|
| 1333 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1334 | 'r', id->relbit, 0, REL_MAX);
|
| 1335 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1336 | 'a', id->absbit, 0, ABS_MAX);
|
| 1337 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1338 | 'm', id->mscbit, 0, MSC_MAX);
|
| 1339 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1340 | 'l', id->ledbit, 0, LED_MAX);
|
| 1341 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1342 | 's', id->sndbit, 0, SND_MAX);
|
| 1343 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1344 | 'f', id->ffbit, 0, FF_MAX);
|
| 1345 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1346 | 'w', id->swbit, 0, SW_MAX);
|
| 1347 |
|
| 1348 | if (add_cr)
|
| 1349 | len += snprintf(buf + len, max(size - len, 0), "\n");
|
| 1350 |
|
| 1351 | return len;
|
| 1352 | }
|
| 1353 |
|
| 1354 | static ssize_t input_dev_show_modalias(struct device *dev,
|
| 1355 | struct device_attribute *attr,
|
| 1356 | char *buf)
|
| 1357 | {
|
| 1358 | struct input_dev *id = to_input_dev(dev);
|
| 1359 | ssize_t len;
|
| 1360 |
|
| 1361 | len = input_print_modalias(buf, PAGE_SIZE, id, 1);
|
| 1362 |
|
| 1363 | return min_t(int, len, PAGE_SIZE);
|
| 1364 | }
|
| 1365 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
|
| 1366 |
|
| 1367 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
|
| 1368 | int max, int add_cr);
|
| 1369 |
|
| 1370 | static ssize_t input_dev_show_properties(struct device *dev,
|
| 1371 | struct device_attribute *attr,
|
| 1372 | char *buf)
|
| 1373 | {
|
| 1374 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1375 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
|
| 1376 | INPUT_PROP_MAX, true);
|
| 1377 | return min_t(int, len, PAGE_SIZE);
|
| 1378 | }
|
| 1379 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
|
| 1380 |
|
| 1381 | static struct attribute *input_dev_attrs[] = {
|
| 1382 | &dev_attr_name.attr,
|
| 1383 | &dev_attr_phys.attr,
|
| 1384 | &dev_attr_uniq.attr,
|
| 1385 | &dev_attr_modalias.attr,
|
| 1386 | &dev_attr_properties.attr,
|
| 1387 | NULL
|
| 1388 | };
|
| 1389 |
|
| 1390 | static struct attribute_group input_dev_attr_group = {
|
| 1391 | .attrs = input_dev_attrs,
|
| 1392 | };
|
| 1393 |
|
| 1394 | #define INPUT_DEV_ID_ATTR(name) \
|
| 1395 | static ssize_t input_dev_show_id_##name(struct device *dev, \
|
| 1396 | struct device_attribute *attr, \
|
| 1397 | char *buf) \
|
| 1398 | { \
|
| 1399 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1400 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
|
| 1401 | } \
|
| 1402 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
|
| 1403 |
|
| 1404 | INPUT_DEV_ID_ATTR(bustype);
|
| 1405 | INPUT_DEV_ID_ATTR(vendor);
|
| 1406 | INPUT_DEV_ID_ATTR(product);
|
| 1407 | INPUT_DEV_ID_ATTR(version);
|
| 1408 |
|
| 1409 | static struct attribute *input_dev_id_attrs[] = {
|
| 1410 | &dev_attr_bustype.attr,
|
| 1411 | &dev_attr_vendor.attr,
|
| 1412 | &dev_attr_product.attr,
|
| 1413 | &dev_attr_version.attr,
|
| 1414 | NULL
|
| 1415 | };
|
| 1416 |
|
| 1417 | static struct attribute_group input_dev_id_attr_group = {
|
| 1418 | .name = "id",
|
| 1419 | .attrs = input_dev_id_attrs,
|
| 1420 | };
|
| 1421 |
|
| 1422 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
|
| 1423 | int max, int add_cr)
|
| 1424 | {
|
| 1425 | int i;
|
| 1426 | int len = 0;
|
| 1427 | bool skip_empty = true;
|
| 1428 |
|
| 1429 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
|
| 1430 | len += input_bits_to_string(buf + len, max(buf_size - len, 0),
|
| 1431 | bitmap[i], skip_empty);
|
| 1432 | if (len) {
|
| 1433 | skip_empty = false;
|
| 1434 | if (i > 0)
|
| 1435 | len += snprintf(buf + len, max(buf_size - len, 0), " ");
|
| 1436 | }
|
| 1437 | }
|
| 1438 |
|
| 1439 | |
| 1440 | * If no output was produced print a single 0.
|
| 1441 |
|
| 1442 | if (len == 0)
|
| 1443 | len = snprintf(buf, buf_size, "%d", 0);
|
| 1444 |
|
| 1445 | if (add_cr)
|
| 1446 | len += snprintf(buf + len, max(buf_size - len, 0), "\n");
|
| 1447 |
|
| 1448 | return len;
|
| 1449 | }
|
| 1450 |
|
| 1451 | #define INPUT_DEV_CAP_ATTR(ev, bm) \
|
| 1452 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \
|
| 1453 | struct device_attribute *attr, \
|
| 1454 | char *buf) \
|
| 1455 | { \
|
| 1456 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1457 | int len = input_print_bitmap(buf, PAGE_SIZE, \
|
| 1458 | input_dev->bm##bit, ev##_MAX, \
|
| 1459 | true); \
|
| 1460 | return min_t(int, len, PAGE_SIZE); \
|
| 1461 | } \
|
| 1462 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
|
| 1463 |
|
| 1464 | INPUT_DEV_CAP_ATTR(EV, ev);
|
| 1465 | INPUT_DEV_CAP_ATTR(KEY, key);
|
| 1466 | INPUT_DEV_CAP_ATTR(REL, rel);
|
| 1467 | INPUT_DEV_CAP_ATTR(ABS, abs);
|
| 1468 | INPUT_DEV_CAP_ATTR(MSC, msc);
|
| 1469 | INPUT_DEV_CAP_ATTR(LED, led);
|
| 1470 | INPUT_DEV_CAP_ATTR(SND, snd);
|
| 1471 | INPUT_DEV_CAP_ATTR(FF, ff);
|
| 1472 | INPUT_DEV_CAP_ATTR(SW, sw);
|
| 1473 |
|
| 1474 | static struct attribute *input_dev_caps_attrs[] = {
|
| 1475 | &dev_attr_ev.attr,
|
| 1476 | &dev_attr_key.attr,
|
| 1477 | &dev_attr_rel.attr,
|
| 1478 | &dev_attr_abs.attr,
|
| 1479 | &dev_attr_msc.attr,
|
| 1480 | &dev_attr_led.attr,
|
| 1481 | &dev_attr_snd.attr,
|
| 1482 | &dev_attr_ff.attr,
|
| 1483 | &dev_attr_sw.attr,
|
| 1484 | NULL
|
| 1485 | };
|
| 1486 |
|
| 1487 | static struct attribute_group input_dev_caps_attr_group = {
|
| 1488 | .name = "capabilities",
|
| 1489 | .attrs = input_dev_caps_attrs,
|
| 1490 | };
|
| 1491 |
|
| 1492 | static const struct attribute_group *input_dev_attr_groups[] = {
|
| 1493 | &input_dev_attr_group,
|
| 1494 | &input_dev_id_attr_group,
|
| 1495 | &input_dev_caps_attr_group,
|
| 1496 | NULL
|
| 1497 | };
|
| 1498 |
|
| 1499 | static void input_dev_release(struct device *device)
|
| 1500 | {
|
| 1501 | struct input_dev *dev = to_input_dev(device);
|
| 1502 |
|
| 1503 | input_ff_destroy(dev);
|
| 1504 | input_mt_destroy_slots(dev);
|
| 1505 | kfree(dev->absinfo);
|
| 1506 | kfree(dev->vals);
|
| 1507 | kfree(dev);
|
| 1508 |
|
| 1509 | module_put(THIS_MODULE);
|
| 1510 | }
|
| 1511 |
|
| 1512 | |
| 1513 | * Input uevent interface - loading event handlers based on
|
| 1514 | * device bitfields.
|
| 1515 |
|
| 1516 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
|
| 1517 | const char *name, unsigned long *bitmap, int max)
|
| 1518 | {
|
| 1519 | int len;
|
| 1520 |
|
| 1521 | if (add_uevent_var(env, "%s", name))
|
| 1522 | return -ENOMEM;
|
| 1523 |
|
| 1524 | len = input_print_bitmap(&env->buf[env->buflen - 1],
|
| 1525 | sizeof(env->buf) - env->buflen,
|
| 1526 | bitmap, max, false);
|
| 1527 | if (len >= (sizeof(env->buf) - env->buflen))
|
| 1528 | return -ENOMEM;
|
| 1529 |
|
| 1530 | env->buflen += len;
|
| 1531 | return 0;
|
| 1532 | }
|
| 1533 |
|
| 1534 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
|
| 1535 | struct input_dev *dev)
|
| 1536 | {
|
| 1537 | int len;
|
| 1538 |
|
| 1539 | if (add_uevent_var(env, "MODALIAS="))
|
| 1540 | return -ENOMEM;
|
| 1541 |
|
| 1542 | len = input_print_modalias(&env->buf[env->buflen - 1],
|
| 1543 | sizeof(env->buf) - env->buflen,
|
| 1544 | dev, 0);
|
| 1545 | if (len >= (sizeof(env->buf) - env->buflen))
|
| 1546 | return -ENOMEM;
|
| 1547 |
|
| 1548 | env->buflen += len;
|
| 1549 | return 0;
|
| 1550 | }
|
| 1551 |
|
| 1552 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
|
| 1553 | do { \
|
| 1554 | int err = add_uevent_var(env, fmt, val); \
|
| 1555 | if (err) \
|
| 1556 | return err; \
|
| 1557 | } while (0)
|
| 1558 |
|
| 1559 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
|
| 1560 | do { \
|
| 1561 | int err = input_add_uevent_bm_var(env, name, bm, max); \
|
| 1562 | if (err) \
|
| 1563 | return err; \
|
| 1564 | } while (0)
|
| 1565 |
|
| 1566 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
|
| 1567 | do { \
|
| 1568 | int err = input_add_uevent_modalias_var(env, dev); \
|
| 1569 | if (err) \
|
| 1570 | return err; \
|
| 1571 | } while (0)
|
| 1572 |
|
| 1573 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
|
| 1574 | {
|
| 1575 | struct input_dev *dev = to_input_dev(device);
|
| 1576 |
|
| 1577 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
|
| 1578 | dev->id.bustype, dev->id.vendor,
|
| 1579 | dev->id.product, dev->id.version);
|
| 1580 | if (dev->name)
|
| 1581 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
|
| 1582 | if (dev->phys)
|
| 1583 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
|
| 1584 | if (dev->uniq)
|
| 1585 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
|
| 1586 |
|
| 1587 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
|
| 1588 |
|
| 1589 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
|
| 1590 | if (test_bit(EV_KEY, dev->evbit))
|
| 1591 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
|
| 1592 | if (test_bit(EV_REL, dev->evbit))
|
| 1593 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
|
| 1594 | if (test_bit(EV_ABS, dev->evbit))
|
| 1595 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
|
| 1596 | if (test_bit(EV_MSC, dev->evbit))
|
| 1597 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
|
| 1598 | if (test_bit(EV_LED, dev->evbit))
|
| 1599 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
|
| 1600 | if (test_bit(EV_SND, dev->evbit))
|
| 1601 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
|
| 1602 | if (test_bit(EV_FF, dev->evbit))
|
| 1603 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
|
| 1604 | if (test_bit(EV_SW, dev->evbit))
|
| 1605 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
|
| 1606 |
|
| 1607 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
|
| 1608 |
|
| 1609 | return 0;
|
| 1610 | }
|
| 1611 |
|
| 1612 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \
|
| 1613 | do { \
|
| 1614 | int i; \
|
| 1615 | bool active; \
|
| 1616 | \
|
| 1617 | if (!test_bit(EV_##type, dev->evbit)) \
|
| 1618 | break; \
|
| 1619 | \
|
| 1620 | for (i = 0; i < type##_MAX; i++) { \
|
| 1621 | if (!test_bit(i, dev->bits##bit)) \
|
| 1622 | continue; \
|
| 1623 | \
|
| 1624 | active = test_bit(i, dev->bits); \
|
| 1625 | if (!active && !on) \
|
| 1626 | continue; \
|
| 1627 | \
|
| 1628 | dev->event(dev, EV_##type, i, on ? active : 0); \
|
| 1629 | } \
|
| 1630 | } while (0)
|
| 1631 |
|
| 1632 | static void input_dev_toggle(struct input_dev *dev, bool activate)
|
| 1633 | {
|
| 1634 | if (!dev->event)
|
| 1635 | return;
|
| 1636 |
|
| 1637 | INPUT_DO_TOGGLE(dev, LED, led, activate);
|
| 1638 | INPUT_DO_TOGGLE(dev, SND, snd, activate);
|
| 1639 |
|
| 1640 | if (activate && test_bit(EV_REP, dev->evbit)) {
|
| 1641 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
|
| 1642 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
|
| 1643 | }
|
| 1644 | }
|
| 1645 |
|
| 1646 | |
| 1647 | * input_reset_device() - reset/restore the state of input device
|
| 1648 | * @dev: input device whose state needs to be reset
|
| 1649 | *
|
| 1650 | * This function tries to reset the state of an opened input device and
|
| 1651 | * bring internal state and state if the hardware in sync with each other.
|
| 1652 | * We mark all keys as released, restore LED state, repeat rate, etc.
|
| 1653 |
|
| 1654 | void input_reset_device(struct input_dev *dev)
|
| 1655 | {
|
| 1656 | mutex_lock(&dev->mutex);
|
| 1657 |
|
| 1658 | if (dev->users) {
|
| 1659 | input_dev_toggle(dev, true);
|
| 1660 |
|
| 1661 | |
| 1662 | * Keys that have been pressed at suspend time are unlikely
|
| 1663 | * to be still pressed when we resume.
|
| 1664 |
|
| 1665 | spin_lock_irq(&dev->event_lock);
|
| 1666 | input_dev_release_keys(dev);
|
| 1667 | spin_unlock_irq(&dev->event_lock);
|
| 1668 | }
|
| 1669 |
|
| 1670 | mutex_unlock(&dev->mutex);
|
| 1671 | }
|
| 1672 | EXPORT_SYMBOL(input_reset_device);
|
| 1673 |
|
| 1674 | #ifdef CONFIG_PM
|
| 1675 | static int input_dev_suspend(struct device *dev)
|
| 1676 | {
|
| 1677 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1678 |
|
| 1679 | mutex_lock(&input_dev->mutex);
|
| 1680 |
|
| 1681 | if (input_dev->users)
|
| 1682 | input_dev_toggle(input_dev, false);
|
| 1683 |
|
| 1684 | mutex_unlock(&input_dev->mutex);
|
| 1685 |
|
| 1686 | return 0;
|
| 1687 | }
|
| 1688 |
|
| 1689 | static int input_dev_resume(struct device *dev)
|
| 1690 | {
|
| 1691 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1692 |
|
| 1693 | input_reset_device(input_dev);
|
| 1694 |
|
| 1695 | return 0;
|
| 1696 | }
|
| 1697 |
|
| 1698 | static const struct dev_pm_ops input_dev_pm_ops = {
|
| 1699 | .suspend = input_dev_suspend,
|
| 1700 | .resume = input_dev_resume,
|
| 1701 | .poweroff = input_dev_suspend,
|
| 1702 | .restore = input_dev_resume,
|
| 1703 | };
|
| 1704 | #endif
|
| 1705 |
|
| 1706 | static struct device_type input_dev_type = {
|
| 1707 | .groups = input_dev_attr_groups,
|
| 1708 | .release = input_dev_release,
|
| 1709 | .uevent = input_dev_uevent,
|
| 1710 | #ifdef CONFIG_PM
|
| 1711 | .pm = &input_dev_pm_ops,
|
| 1712 | #endif
|
| 1713 | };
|
| 1714 |
|
| 1715 | static char *input_devnode(struct device *dev, umode_t *mode)
|
| 1716 | {
|
| 1717 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
|
| 1718 | }
|
| 1719 |
|
| 1720 | struct class input_class = {
|
| 1721 | .name = "input",
|
| 1722 | .devnode = input_devnode,
|
| 1723 | };
|
| 1724 | EXPORT_SYMBOL_GPL(input_class);
|
| 1725 |
|
| 1726 | |
| 1727 | * input_allocate_device - allocate memory for new input device
|
| 1728 | *
|
| 1729 | * Returns prepared struct input_dev or %NULL.
|
| 1730 | *
|
| 1731 | * NOTE: Use input_free_device() to free devices that have not been
|
| 1732 | * registered; input_unregister_device() should be used for already
|
| 1733 | * registered devices.
|
| 1734 |
|
| 1735 | struct input_dev *input_allocate_device(void)
|
| 1736 | {
|
| 1737 | struct input_dev *dev;
|
| 1738 |
|
| 1739 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
|
| 1740 | if (dev) {
|
| 1741 | dev->dev.type = &input_dev_type;
|
| 1742 | dev->dev.class = &input_class;
|
| 1743 | device_initialize(&dev->dev);
|
| 1744 | mutex_init(&dev->mutex);
|
| 1745 | spin_lock_init(&dev->event_lock);
|
| 1746 | INIT_LIST_HEAD(&dev->h_list);
|
| 1747 | INIT_LIST_HEAD(&dev->node);
|
| 1748 |
|
| 1749 | __module_get(THIS_MODULE);
|
| 1750 | }
|
| 1751 |
|
| 1752 | return dev;
|
| 1753 | }
|
| 1754 | EXPORT_SYMBOL(input_allocate_device);
|
| 1755 |
|
| 1756 | struct input_devres {
|
| 1757 | struct input_dev *input;
|
| 1758 | };
|
| 1759 |
|
| 1760 | static int devm_input_device_match(struct device *dev, void *res, void *data)
|
| 1761 | {
|
| 1762 | struct input_devres *devres = res;
|
| 1763 |
|
| 1764 | return devres->input == data;
|
| 1765 | }
|
| 1766 |
|
| 1767 | static void devm_input_device_release(struct device *dev, void *res)
|
| 1768 | {
|
| 1769 | struct input_devres *devres = res;
|
| 1770 | struct input_dev *input = devres->input;
|
| 1771 |
|
| 1772 | dev_dbg(dev, "%s: dropping reference to %s\n",
|
| 1773 | __func__, dev_name(&input->dev));
|
| 1774 | input_put_device(input);
|
| 1775 | }
|
| 1776 |
|
| 1777 | |
| 1778 | * devm_input_allocate_device - allocate managed input device
|
| 1779 | * @dev: device owning the input device being created
|
| 1780 | *
|
| 1781 | * Returns prepared struct input_dev or %NULL.
|
| 1782 | *
|
| 1783 | * Managed input devices do not need to be explicitly unregistered or
|
| 1784 | * freed as it will be done automatically when owner device unbinds from
|
| 1785 | * its driver (or binding fails). Once managed input device is allocated,
|
| 1786 | * it is ready to be set up and registered in the same fashion as regular
|
| 1787 | * input device. There are no special devm_input_device_[un]register()
|
| 1788 | * variants, regular ones work with both managed and unmanaged devices,
|
| 1789 | * should you need them. In most cases however, managed input device need
|
| 1790 | * not be explicitly unregistered or freed.
|
| 1791 | *
|
| 1792 | * NOTE: the owner device is set up as parent of input device and users
|
| 1793 | * should not override it.
|
| 1794 |
|
| 1795 | struct input_dev *devm_input_allocate_device(struct device *dev)
|
| 1796 | {
|
| 1797 | struct input_dev *input;
|
| 1798 | struct input_devres *devres;
|
| 1799 |
|
| 1800 | devres = devres_alloc(devm_input_device_release,
|
| 1801 | sizeof(struct input_devres), GFP_KERNEL);
|
| 1802 | if (!devres)
|
| 1803 | return NULL;
|
| 1804 |
|
| 1805 | input = input_allocate_device();
|
| 1806 | if (!input) {
|
| 1807 | devres_free(devres);
|
| 1808 | return NULL;
|
| 1809 | }
|
| 1810 |
|
| 1811 | input->dev.parent = dev;
|
| 1812 | input->devres_managed = true;
|
| 1813 |
|
| 1814 | devres->input = input;
|
| 1815 | devres_add(dev, devres);
|
| 1816 |
|
| 1817 | return input;
|
| 1818 | }
|
| 1819 | EXPORT_SYMBOL(devm_input_allocate_device);
|
| 1820 |
|
| 1821 | |
| 1822 | * input_free_device - free memory occupied by input_dev structure
|
| 1823 | * @dev: input device to free
|
| 1824 | *
|
| 1825 | * This function should only be used if input_register_device()
|
| 1826 | * was not called yet or if it failed. Once device was registered
|
| 1827 | * use input_unregister_device() and memory will be freed once last
|
| 1828 | * reference to the device is dropped.
|
| 1829 | *
|
| 1830 | * Device should be allocated by input_allocate_device().
|
| 1831 | *
|
| 1832 | * NOTE: If there are references to the input device then memory
|
| 1833 | * will not be freed until last reference is dropped.
|
| 1834 |
|
| 1835 | void input_free_device(struct input_dev *dev)
|
| 1836 | {
|
| 1837 | if (dev) {
|
| 1838 | if (dev->devres_managed)
|
| 1839 | WARN_ON(devres_destroy(dev->dev.parent,
|
| 1840 | devm_input_device_release,
|
| 1841 | devm_input_device_match,
|
| 1842 | dev));
|
| 1843 | input_put_device(dev);
|
| 1844 | }
|
| 1845 | }
|
| 1846 | EXPORT_SYMBOL(input_free_device);
|
| 1847 |
|
| 1848 | |
| 1849 | * input_set_capability - mark device as capable of a certain event
|
| 1850 | * @dev: device that is capable of emitting or accepting event
|
| 1851 | * @type: type of the event (EV_KEY, EV_REL, etc...)
|
| 1852 | * @code: event code
|
| 1853 | *
|
| 1854 | * In addition to setting up corresponding bit in appropriate capability
|
| 1855 | * bitmap the function also adjusts dev->evbit.
|
| 1856 |
|
| 1857 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
|
| 1858 | {
|
| 1859 | switch (type) {
|
| 1860 | case EV_KEY:
|
| 1861 | __set_bit(code, dev->keybit);
|
| 1862 | break;
|
| 1863 |
|
| 1864 | case EV_REL:
|
| 1865 | __set_bit(code, dev->relbit);
|
| 1866 | break;
|
| 1867 |
|
| 1868 | case EV_ABS:
|
| 1869 | __set_bit(code, dev->absbit);
|
| 1870 | break;
|
| 1871 |
|
| 1872 | case EV_MSC:
|
| 1873 | __set_bit(code, dev->mscbit);
|
| 1874 | break;
|
| 1875 |
|
| 1876 | case EV_SW:
|
| 1877 | __set_bit(code, dev->swbit);
|
| 1878 | break;
|
| 1879 |
|
| 1880 | case EV_LED:
|
| 1881 | __set_bit(code, dev->ledbit);
|
| 1882 | break;
|
| 1883 |
|
| 1884 | case EV_SND:
|
| 1885 | __set_bit(code, dev->sndbit);
|
| 1886 | break;
|
| 1887 |
|
| 1888 | case EV_FF:
|
| 1889 | __set_bit(code, dev->ffbit);
|
| 1890 | break;
|
| 1891 |
|
| 1892 | case EV_PWR:
|
| 1893 |
|
| 1894 | break;
|
| 1895 |
|
| 1896 | default:
|
| 1897 | pr_err("input_set_capability: unknown type %u (code %u)\n",
|
| 1898 | type, code);
|
| 1899 | dump_stack();
|
| 1900 | return;
|
| 1901 | }
|
| 1902 |
|
| 1903 | __set_bit(type, dev->evbit);
|
| 1904 | }
|
| 1905 | EXPORT_SYMBOL(input_set_capability);
|
| 1906 |
|
| 1907 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
|
| 1908 | {
|
| 1909 | int mt_slots;
|
| 1910 | int i;
|
| 1911 | unsigned int events;
|
| 1912 |
|
| 1913 | if (dev->mt) {
|
| 1914 | mt_slots = dev->mt->num_slots;
|
| 1915 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
|
| 1916 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
|
| 1917 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
|
| 1918 | mt_slots = clamp(mt_slots, 2, 32);
|
| 1919 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
|
| 1920 | mt_slots = 2;
|
| 1921 | } else {
|
| 1922 | mt_slots = 0;
|
| 1923 | }
|
| 1924 |
|
| 1925 | events = mt_slots + 1;
|
| 1926 |
|
| 1927 | for (i = 0; i < ABS_CNT; i++) {
|
| 1928 | if (test_bit(i, dev->absbit)) {
|
| 1929 | if (input_is_mt_axis(i))
|
| 1930 | events += mt_slots;
|
| 1931 | else
|
| 1932 | events++;
|
| 1933 | }
|
| 1934 | }
|
| 1935 |
|
| 1936 | for (i = 0; i < REL_CNT; i++)
|
| 1937 | if (test_bit(i, dev->relbit))
|
| 1938 | events++;
|
| 1939 |
|
| 1940 |
|
| 1941 | events += 7;
|
| 1942 |
|
| 1943 | return events;
|
| 1944 | }
|
| 1945 |
|
| 1946 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
|
| 1947 | do { \
|
| 1948 | if (!test_bit(EV_##type, dev->evbit)) \
|
| 1949 | memset(dev->bits##bit, 0, \
|
| 1950 | sizeof(dev->bits##bit)); \
|
| 1951 | } while (0)
|
| 1952 |
|
| 1953 | static void input_cleanse_bitmasks(struct input_dev *dev)
|
| 1954 | {
|
| 1955 | INPUT_CLEANSE_BITMASK(dev, KEY, key);
|
| 1956 | INPUT_CLEANSE_BITMASK(dev, REL, rel);
|
| 1957 | INPUT_CLEANSE_BITMASK(dev, ABS, abs);
|
| 1958 | INPUT_CLEANSE_BITMASK(dev, MSC, msc);
|
| 1959 | INPUT_CLEANSE_BITMASK(dev, LED, led);
|
| 1960 | INPUT_CLEANSE_BITMASK(dev, SND, snd);
|
| 1961 | INPUT_CLEANSE_BITMASK(dev, FF, ff);
|
| 1962 | INPUT_CLEANSE_BITMASK(dev, SW, sw);
|
| 1963 | }
|
| 1964 |
|
| 1965 | static void __input_unregister_device(struct input_dev *dev)
|
| 1966 | {
|
| 1967 | struct input_handle *handle, *next;
|
| 1968 |
|
| 1969 | input_disconnect_device(dev);
|
| 1970 |
|
| 1971 | mutex_lock(&input_mutex);
|
| 1972 |
|
| 1973 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
|
| 1974 | handle->handler->disconnect(handle);
|
| 1975 | WARN_ON(!list_empty(&dev->h_list));
|
| 1976 |
|
| 1977 | del_timer_sync(&dev->timer);
|
| 1978 | list_del_init(&dev->node);
|
| 1979 |
|
| 1980 | input_wakeup_procfs_readers();
|
| 1981 |
|
| 1982 | mutex_unlock(&input_mutex);
|
| 1983 |
|
| 1984 | device_del(&dev->dev);
|
| 1985 | }
|
| 1986 |
|
| 1987 | static void devm_input_device_unregister(struct device *dev, void *res)
|
| 1988 | {
|
| 1989 | struct input_devres *devres = res;
|
| 1990 | struct input_dev *input = devres->input;
|
| 1991 |
|
| 1992 | dev_dbg(dev, "%s: unregistering device %s\n",
|
| 1993 | __func__, dev_name(&input->dev));
|
| 1994 | __input_unregister_device(input);
|
| 1995 | }
|
| 1996 |
|
| 1997 | |
| 1998 | * input_register_device - register device with input core
|
| 1999 | * @dev: device to be registered
|
| 2000 | *
|
| 2001 | * This function registers device with input core. The device must be
|
| 2002 | * allocated with input_allocate_device() and all it's capabilities
|
| 2003 | * set up before registering.
|
| 2004 | * If function fails the device must be freed with input_free_device().
|
| 2005 | * Once device has been successfully registered it can be unregistered
|
| 2006 | * with input_unregister_device(); input_free_device() should not be
|
| 2007 | * called in this case.
|
| 2008 | *
|
| 2009 | * Note that this function is also used to register managed input devices
|
| 2010 | * (ones allocated with devm_input_allocate_device()). Such managed input
|
| 2011 | * devices need not be explicitly unregistered or freed, their tear down
|
| 2012 | * is controlled by the devres infrastructure. It is also worth noting
|
| 2013 | * that tear down of managed input devices is internally a 2-step process:
|
| 2014 | * registered managed input device is first unregistered, but stays in
|
| 2015 | * memory and can still handle input_event() calls (although events will
|
| 2016 | * not be delivered anywhere). The freeing of managed input device will
|
| 2017 | * happen later, when devres stack is unwound to the point where device
|
| 2018 | * allocation was made.
|
| 2019 |
|
| 2020 | int input_register_device(struct input_dev *dev)
|
| 2021 | {
|
| 2022 | static atomic_t input_no = ATOMIC_INIT(0);
|
| 2023 | struct input_devres *devres = NULL;
|
| 2024 | struct input_handler *handler;
|
| 2025 | unsigned int packet_size;
|
| 2026 | const char *path;
|
| 2027 | int error;
|
| 2028 |
|
| 2029 | if (dev->devres_managed) {
|
| 2030 | devres = devres_alloc(devm_input_device_unregister,
|
| 2031 | sizeof(struct input_devres), GFP_KERNEL);
|
| 2032 | if (!devres)
|
| 2033 | return -ENOMEM;
|
| 2034 |
|
| 2035 | devres->input = dev;
|
| 2036 | }
|
| 2037 |
|
| 2038 |
|
| 2039 | __set_bit(EV_SYN, dev->evbit);
|
| 2040 |
|
| 2041 |
|
| 2042 | __clear_bit(KEY_RESERVED, dev->keybit);
|
| 2043 |
|
| 2044 |
|
| 2045 | input_cleanse_bitmasks(dev);
|
| 2046 |
|
| 2047 | packet_size = input_estimate_events_per_packet(dev);
|
| 2048 | if (dev->hint_events_per_packet < packet_size)
|
| 2049 | dev->hint_events_per_packet = packet_size;
|
| 2050 |
|
| 2051 | dev->max_vals = max(dev->hint_events_per_packet, packet_size) + 2;
|
| 2052 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
|
| 2053 | if (!dev->vals) {
|
| 2054 | error = -ENOMEM;
|
| 2055 | goto err_devres_free;
|
| 2056 | }
|
| 2057 |
|
| 2058 | |
| 2059 | * If delay and period are pre-set by the driver, then autorepeating
|
| 2060 | * is handled by the driver itself and we don't do it in input.c.
|
| 2061 |
|
| 2062 | init_timer(&dev->timer);
|
| 2063 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
|
| 2064 | dev->timer.data = (long) dev;
|
| 2065 | dev->timer.function = input_repeat_key;
|
| 2066 | dev->rep[REP_DELAY] = 250;
|
| 2067 | dev->rep[REP_PERIOD] = 33;
|
| 2068 | }
|
| 2069 |
|
| 2070 | if (!dev->getkeycode)
|
| 2071 | dev->getkeycode = input_default_getkeycode;
|
| 2072 |
|
| 2073 | if (!dev->setkeycode)
|
| 2074 | dev->setkeycode = input_default_setkeycode;
|
| 2075 |
|
| 2076 | dev_set_name(&dev->dev, "input%ld",
|
| 2077 | (unsigned long) atomic_inc_return(&input_no) - 1);
|
| 2078 |
|
| 2079 | error = device_add(&dev->dev);
|
| 2080 | if (error)
|
| 2081 | goto err_free_vals;
|
| 2082 |
|
| 2083 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
| 2084 | pr_info("%s as %s\n",
|
| 2085 | dev->name ? dev->name : "Unspecified device",
|
| 2086 | path ? path : "N/A");
|
| 2087 | kfree(path);
|
| 2088 |
|
| 2089 | error = mutex_lock_interruptible(&input_mutex);
|
| 2090 | if (error)
|
| 2091 | goto err_device_del;
|
| 2092 |
|
| 2093 | list_add_tail(&dev->node, &input_dev_list);
|
| 2094 |
|
| 2095 | list_for_each_entry(handler, &input_handler_list, node)
|
| 2096 | input_attach_handler(dev, handler);
|
| 2097 |
|
| 2098 | input_wakeup_procfs_readers();
|
| 2099 |
|
| 2100 | mutex_unlock(&input_mutex);
|
| 2101 |
|
| 2102 | if (dev->devres_managed) {
|
| 2103 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
|
| 2104 | __func__, dev_name(&dev->dev));
|
| 2105 | devres_add(dev->dev.parent, devres);
|
| 2106 | }
|
| 2107 | return 0;
|
| 2108 |
|
| 2109 | err_device_del:
|
| 2110 | device_del(&dev->dev);
|
| 2111 | err_free_vals:
|
| 2112 | kfree(dev->vals);
|
| 2113 | dev->vals = NULL;
|
| 2114 | err_devres_free:
|
| 2115 | devres_free(devres);
|
| 2116 | return error;
|
| 2117 | }
|
| 2118 | EXPORT_SYMBOL(input_register_device);
|
| 2119 |
|
| 2120 | |
| 2121 | * input_unregister_device - unregister previously registered device
|
| 2122 | * @dev: device to be unregistered
|
| 2123 | *
|
| 2124 | * This function unregisters an input device. Once device is unregistered
|
| 2125 | * the caller should not try to access it as it may get freed at any moment.
|
| 2126 |
|
| 2127 | void input_unregister_device(struct input_dev *dev)
|
| 2128 | {
|
| 2129 | if (dev->devres_managed) {
|
| 2130 | WARN_ON(devres_destroy(dev->dev.parent,
|
| 2131 | devm_input_device_unregister,
|
| 2132 | devm_input_device_match,
|
| 2133 | dev));
|
| 2134 | __input_unregister_device(dev);
|
| 2135 | |
| 2136 | * We do not do input_put_device() here because it will be done
|
| 2137 | * when 2nd devres fires up.
|
| 2138 |
|
| 2139 | } else {
|
| 2140 | __input_unregister_device(dev);
|
| 2141 | input_put_device(dev);
|
| 2142 | }
|
| 2143 | }
|
| 2144 | EXPORT_SYMBOL(input_unregister_device);
|
| 2145 |
|
| 2146 | |
| 2147 | * input_register_handler - register a new input handler
|
| 2148 | * @handler: handler to be registered
|
| 2149 | *
|
| 2150 | * This function registers a new input handler (interface) for input
|
| 2151 | * devices in the system and attaches it to all input devices that
|
| 2152 | * are compatible with the handler.
|
| 2153 |
|
| 2154 | int input_register_handler(struct input_handler *handler)
|
| 2155 | {
|
| 2156 | struct input_dev *dev;
|
| 2157 | int error;
|
| 2158 |
|
| 2159 | error = mutex_lock_interruptible(&input_mutex);
|
| 2160 | if (error)
|
| 2161 | return error;
|
| 2162 |
|
| 2163 | INIT_LIST_HEAD(&handler->h_list);
|
| 2164 |
|
| 2165 | list_add_tail(&handler->node, &input_handler_list);
|
| 2166 |
|
| 2167 | list_for_each_entry(dev, &input_dev_list, node)
|
| 2168 | input_attach_handler(dev, handler);
|
| 2169 |
|
| 2170 | input_wakeup_procfs_readers();
|
| 2171 |
|
| 2172 | mutex_unlock(&input_mutex);
|
| 2173 | return 0;
|
| 2174 | }
|
| 2175 | EXPORT_SYMBOL(input_register_handler);
|
| 2176 |
|
| 2177 | |
| 2178 | * input_unregister_handler - unregisters an input handler
|
| 2179 | * @handler: handler to be unregistered
|
| 2180 | *
|
| 2181 | * This function disconnects a handler from its input devices and
|
| 2182 | * removes it from lists of known handlers.
|
| 2183 |
|
| 2184 | void input_unregister_handler(struct input_handler *handler)
|
| 2185 | {
|
| 2186 | struct input_handle *handle, *next;
|
| 2187 |
|
| 2188 | mutex_lock(&input_mutex);
|
| 2189 |
|
| 2190 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
|
| 2191 | handler->disconnect(handle);
|
| 2192 | WARN_ON(!list_empty(&handler->h_list));
|
| 2193 |
|
| 2194 | list_del_init(&handler->node);
|
| 2195 |
|
| 2196 | input_wakeup_procfs_readers();
|
| 2197 |
|
| 2198 | mutex_unlock(&input_mutex);
|
| 2199 | }
|
| 2200 | EXPORT_SYMBOL(input_unregister_handler);
|
| 2201 |
|
| 2202 | |
| 2203 | * input_handler_for_each_handle - handle iterator
|
| 2204 | * @handler: input handler to iterate
|
| 2205 | * @data: data for the callback
|
| 2206 | * @fn: function to be called for each handle
|
| 2207 | *
|
| 2208 | * Iterate over @bus's list of devices, and call @fn for each, passing
|
| 2209 | * it @data and stop when @fn returns a non-zero value. The function is
|
| 2210 | * using RCU to traverse the list and therefore may be usind in atonic
|
| 2211 | * contexts. The @fn callback is invoked from RCU critical section and
|
| 2212 | * thus must not sleep.
|
| 2213 |
|
| 2214 | int input_handler_for_each_handle(struct input_handler *handler, void *data,
|
| 2215 | int (*fn)(struct input_handle *, void *))
|
| 2216 | {
|
| 2217 | struct input_handle *handle;
|
| 2218 | int retval = 0;
|
| 2219 |
|
| 2220 | rcu_read_lock();
|
| 2221 |
|
| 2222 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
|
| 2223 | retval = fn(handle, data);
|
| 2224 | if (retval)
|
| 2225 | break;
|
| 2226 | }
|
| 2227 |
|
| 2228 | rcu_read_unlock();
|
| 2229 |
|
| 2230 | return retval;
|
| 2231 | }
|
| 2232 | EXPORT_SYMBOL(input_handler_for_each_handle);
|
| 2233 |
|
| 2234 | |
| 2235 | * input_register_handle - register a new input handle
|
| 2236 | * @handle: handle to register
|
| 2237 | *
|
| 2238 | * This function puts a new input handle onto device's
|
| 2239 | * and handler's lists so that events can flow through
|
| 2240 | * it once it is opened using input_open_device().
|
| 2241 | *
|
| 2242 | * This function is supposed to be called from handler's
|
| 2243 | * connect() method.
|
| 2244 |
|
| 2245 | int input_register_handle(struct input_handle *handle)
|
| 2246 | {
|
| 2247 | struct input_handler *handler = handle->handler;
|
| 2248 | struct input_dev *dev = handle->dev;
|
| 2249 | int error;
|
| 2250 |
|
| 2251 | |
| 2252 | * We take dev->mutex here to prevent race with
|
| 2253 | * input_release_device().
|
| 2254 |
|
| 2255 | error = mutex_lock_interruptible(&dev->mutex);
|
| 2256 | if (error)
|
| 2257 | return error;
|
| 2258 |
|
| 2259 | |
| 2260 | * Filters go to the head of the list, normal handlers
|
| 2261 | * to the tail.
|
| 2262 |
|
| 2263 | if (handler->filter)
|
| 2264 | list_add_rcu(&handle->d_node, &dev->h_list);
|
| 2265 | else
|
| 2266 | list_add_tail_rcu(&handle->d_node, &dev->h_list);
|
| 2267 |
|
| 2268 | mutex_unlock(&dev->mutex);
|
| 2269 |
|
| 2270 | |
| 2271 | * Since we are supposed to be called from ->connect()
|
| 2272 | * which is mutually exclusive with ->disconnect()
|
| 2273 | * we can't be racing with input_unregister_handle()
|
| 2274 | * and so separate lock is not needed here.
|
| 2275 |
|
| 2276 | list_add_tail_rcu(&handle->h_node, &handler->h_list);
|
| 2277 |
|
| 2278 | if (handler->start)
|
| 2279 | handler->start(handle);
|
| 2280 |
|
| 2281 | return 0;
|
| 2282 | }
|
| 2283 | EXPORT_SYMBOL(input_register_handle);
|
| 2284 |
|
| 2285 | |
| 2286 | * input_unregister_handle - unregister an input handle
|
| 2287 | * @handle: handle to unregister
|
| 2288 | *
|
| 2289 | * This function removes input handle from device's
|
| 2290 | * and handler's lists.
|
| 2291 | *
|
| 2292 | * This function is supposed to be called from handler's
|
| 2293 | * disconnect() method.
|
| 2294 |
|
| 2295 | void input_unregister_handle(struct input_handle *handle)
|
| 2296 | {
|
| 2297 | struct input_dev *dev = handle->dev;
|
| 2298 |
|
| 2299 | list_del_rcu(&handle->h_node);
|
| 2300 |
|
| 2301 | |
| 2302 | * Take dev->mutex to prevent race with input_release_device().
|
| 2303 |
|
| 2304 | mutex_lock(&dev->mutex);
|
| 2305 | list_del_rcu(&handle->d_node);
|
| 2306 | mutex_unlock(&dev->mutex);
|
| 2307 |
|
| 2308 | synchronize_rcu();
|
| 2309 | }
|
| 2310 | EXPORT_SYMBOL(input_unregister_handle);
|
| 2311 |
|
| 2312 | |
| 2313 | * input_get_new_minor - allocates a new input minor number
|
| 2314 | * @legacy_base: beginning or the legacy range to be searched
|
| 2315 | * @legacy_num: size of legacy range
|
| 2316 | * @allow_dynamic: whether we can also take ID from the dynamic range
|
| 2317 | *
|
| 2318 | * This function allocates a new device minor for from input major namespace.
|
| 2319 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num
|
| 2320 | * parameters and whether ID can be allocated from dynamic range if there are
|
| 2321 | * no free IDs in legacy range.
|
| 2322 |
|
| 2323 | int input_get_new_minor(int legacy_base, unsigned int legacy_num,
|
| 2324 | bool allow_dynamic)
|
| 2325 | {
|
| 2326 | |
| 2327 | * This function should be called from input handler's ->connect()
|
| 2328 | * methods, which are serialized with input_mutex, so no additional
|
| 2329 | * locking is needed here.
|
| 2330 |
|
| 2331 | if (legacy_base >= 0) {
|
| 2332 | int minor = ida_simple_get(&input_ida,
|
| 2333 | legacy_base,
|
| 2334 | legacy_base + legacy_num,
|
| 2335 | GFP_KERNEL);
|
| 2336 | if (minor >= 0 || !allow_dynamic)
|
| 2337 | return minor;
|
| 2338 | }
|
| 2339 |
|
| 2340 | return ida_simple_get(&input_ida,
|
| 2341 | INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
|
| 2342 | GFP_KERNEL);
|
| 2343 | }
|
| 2344 | EXPORT_SYMBOL(input_get_new_minor);
|
| 2345 |
|
| 2346 | |
| 2347 | * input_free_minor - release previously allocated minor
|
| 2348 | * @minor: minor to be released
|
| 2349 | *
|
| 2350 | * This function releases previously allocated input minor so that it can be
|
| 2351 | * reused later.
|
| 2352 |
|
| 2353 | void input_free_minor(unsigned int minor)
|
| 2354 | {
|
| 2355 | ida_simple_remove(&input_ida, minor);
|
| 2356 | }
|
| 2357 | EXPORT_SYMBOL(input_free_minor);
|
| 2358 |
|
| 2359 | static int __init input_init(void)
|
| 2360 | {
|
| 2361 | int err;
|
| 2362 |
|
| 2363 | err = class_register(&input_class);
|
| 2364 | if (err) {
|
| 2365 | pr_err("unable to register input_dev class\n");
|
| 2366 | return err;
|
| 2367 | }
|
| 2368 |
|
| 2369 | err = input_proc_init();
|
| 2370 | if (err)
|
| 2371 | goto fail1;
|
| 2372 |
|
| 2373 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
|
| 2374 | INPUT_MAX_CHAR_DEVICES, "input");
|
| 2375 | if (err) {
|
| 2376 | pr_err("unable to register char major %d", INPUT_MAJOR);
|
| 2377 | goto fail2;
|
| 2378 | }
|
| 2379 |
|
| 2380 | return 0;
|
| 2381 |
|
| 2382 | fail2: input_proc_exit();
|
| 2383 | fail1: class_unregister(&input_class);
|
| 2384 | return err;
|
| 2385 | }
|
| 2386 |
|
| 2387 | static void __exit input_exit(void)
|
| 2388 | {
|
| 2389 | input_proc_exit();
|
| 2390 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
|
| 2391 | INPUT_MAX_CHAR_DEVICES);
|
| 2392 | class_unregister(&input_class);
|
| 2393 | }
|
| 2394 |
|
| 2395 | subsys_initcall(input_init);
|
| 2396 | module_exit(input_exit);
|