| 1 | |
| 2 | |
| 3 | * The input core
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| 4 | *
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| 5 | * Copyright (c) 1999-2002 Vojtech Pavlik
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| 6 |
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| 7 |
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| 8 |
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| 9 | #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
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| 10 |
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| 11 | #include <linux/init.h>
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| 12 | #include <linux/types.h>
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| 13 | #include <linux/idr.h>
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| 14 | #include <linux/input/mt.h>
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| 15 | #include <linux/module.h>
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| 16 | #include <linux/slab.h>
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| 17 | #include <linux/random.h>
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| 18 | #include <linux/major.h>
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| 19 | #include <linux/proc_fs.h>
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| 20 | #include <linux/sched.h>
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| 21 | #include <linux/seq_file.h>
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| 22 | #include <linux/poll.h>
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| 23 | #include <linux/device.h>
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| 24 | #include <linux/mutex.h>
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| 25 | #include <linux/rcupdate.h>
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| 26 | #include "input-compat.h"
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| 27 | #include "input-poller.h"
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| 28 |
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| 29 | MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
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| 30 | MODULE_DESCRIPTION("Input core");
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| 31 | MODULE_LICENSE("GPL");
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| 32 |
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| 33 | #define INPUT_MAX_CHAR_DEVICES 1024
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| 34 | #define INPUT_FIRST_DYNAMIC_DEV 256
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| 35 | static DEFINE_IDA(input_ida);
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| 36 |
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| 37 | static LIST_HEAD(input_dev_list);
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| 38 | static LIST_HEAD(input_handler_list);
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| 39 |
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| 40 | |
| 41 | * input_mutex protects access to both input_dev_list and input_handler_list.
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| 42 | * This also causes input_[un]register_device and input_[un]register_handler
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| 43 | * be mutually exclusive which simplifies locking in drivers implementing
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| 44 | * input handlers.
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| 45 |
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| 46 | static DEFINE_MUTEX(input_mutex);
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| 47 |
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| 48 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
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| 49 |
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| 50 | static inline int is_event_supported(unsigned int code,
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| 51 | unsigned long *bm, unsigned int max)
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| 52 | {
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| 53 | return code <= max && test_bit(code, bm);
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| 54 | }
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| 55 |
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| 56 | static int input_defuzz_abs_event(int value, int old_val, int fuzz)
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| 57 | {
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| 58 | if (fuzz) {
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| 59 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
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| 60 | return old_val;
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| 61 |
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| 62 | if (value > old_val - fuzz && value < old_val + fuzz)
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| 63 | return (old_val * 3 + value) / 4;
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| 64 |
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| 65 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
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| 66 | return (old_val + value) / 2;
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| 67 | }
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| 68 |
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| 69 | return value;
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| 70 | }
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| 71 |
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| 72 | static void input_start_autorepeat(struct input_dev *dev, int code)
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| 73 | {
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| 74 | if (test_bit(EV_REP, dev->evbit) &&
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| 75 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
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| 76 | dev->timer.function) {
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| 77 | dev->repeat_key = code;
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| 78 | mod_timer(&dev->timer,
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| 79 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | static void input_stop_autorepeat(struct input_dev *dev)
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| 84 | {
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| 85 | del_timer(&dev->timer);
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| 86 | }
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| 87 |
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| 88 | |
| 89 | * Pass event first through all filters and then, if event has not been
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| 90 | * filtered out, through all open handles. This function is called with
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| 91 | * dev->event_lock held and interrupts disabled.
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| 92 |
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| 93 | static unsigned int input_to_handler(struct input_handle *handle,
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| 94 | struct input_value *vals, unsigned int count)
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| 95 | {
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| 96 | struct input_handler *handler = handle->handler;
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| 97 | struct input_value *end = vals;
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| 98 | struct input_value *v;
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| 99 |
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| 100 | if (handler->filter) {
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| 101 | for (v = vals; v != vals + count; v++) {
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| 102 | if (handler->filter(handle, v->type, v->code, v->value))
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| 103 | continue;
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| 104 | if (end != v)
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| 105 | *end = *v;
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| 106 | end++;
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| 107 | }
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| 108 | count = end - vals;
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| 109 | }
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| 110 |
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| 111 | if (!count)
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| 112 | return 0;
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| 113 |
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| 114 | if (handler->events)
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| 115 | handler->events(handle, vals, count);
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| 116 | else if (handler->event)
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| 117 | for (v = vals; v != vals + count; v++)
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| 118 | handler->event(handle, v->type, v->code, v->value);
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| 119 |
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| 120 | return count;
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| 121 | }
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| 122 |
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| 123 | |
| 124 | * Pass values first through all filters and then, if event has not been
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| 125 | * filtered out, through all open handles. This function is called with
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| 126 | * dev->event_lock held and interrupts disabled.
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| 127 |
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| 128 | static void input_pass_values(struct input_dev *dev,
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| 129 | struct input_value *vals, unsigned int count)
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| 130 | {
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| 131 | struct input_handle *handle;
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| 132 | struct input_value *v;
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| 133 |
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| 134 | if (!count)
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| 135 | return;
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| 136 |
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| 137 | rcu_read_lock();
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| 138 |
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| 139 | handle = rcu_dereference(dev->grab);
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| 140 | if (handle) {
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| 141 | count = input_to_handler(handle, vals, count);
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| 142 | } else {
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| 143 | list_for_each_entry_rcu(handle, &dev->h_list, d_node)
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| 144 | if (handle->open) {
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| 145 | count = input_to_handler(handle, vals, count);
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| 146 | if (!count)
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| 147 | break;
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | rcu_read_unlock();
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| 152 |
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| 153 |
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| 154 | if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
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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 |
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| 166 | static void input_pass_event(struct input_dev *dev,
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| 167 | unsigned int type, unsigned int code, int value)
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| 168 | {
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| 169 | struct input_value vals[] = { { type, code, value } };
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| 170 |
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| 171 | input_pass_values(dev, vals, ARRAY_SIZE(vals));
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| 172 | }
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| 173 |
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| 174 | |
| 175 | * Generate software autorepeat event. Note that we take
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| 176 | * dev->event_lock here to avoid racing with input_event
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| 177 | * which may cause keys get "stuck".
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| 178 |
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| 179 | static void input_repeat_key(struct timer_list *t)
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| 180 | {
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| 181 | struct input_dev *dev = from_timer(dev, t, timer);
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| 182 | unsigned long flags;
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| 183 |
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| 184 | spin_lock_irqsave(&dev->event_lock, flags);
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| 185 |
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| 186 | if (test_bit(dev->repeat_key, dev->key) &&
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| 187 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
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| 188 | struct input_value vals[] = {
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| 189 | { EV_KEY, dev->repeat_key, 2 },
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| 190 | input_value_sync
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| 191 | };
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| 192 |
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| 193 | input_pass_values(dev, vals, ARRAY_SIZE(vals));
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| 194 |
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| 195 | if (dev->rep[REP_PERIOD])
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| 196 | mod_timer(&dev->timer, jiffies +
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| 197 | msecs_to_jiffies(dev->rep[REP_PERIOD]));
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| 198 | }
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| 199 |
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| 200 | spin_unlock_irqrestore(&dev->event_lock, flags);
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| 201 | }
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| 202 |
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| 203 | #define INPUT_IGNORE_EVENT 0
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| 204 | #define INPUT_PASS_TO_HANDLERS 1
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| 205 | #define INPUT_PASS_TO_DEVICE 2
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| 206 | #define INPUT_SLOT 4
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| 207 | #define INPUT_FLUSH 8
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| 208 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
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| 209 |
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| 210 | static int input_handle_abs_event(struct input_dev *dev,
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| 211 | unsigned int code, int *pval)
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| 212 | {
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| 213 | struct input_mt *mt = dev->mt;
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| 214 | bool is_mt_event;
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| 215 | int *pold;
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| 216 |
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| 217 | if (code == ABS_MT_SLOT) {
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| 218 | |
| 219 | * "Stage" the event; we'll flush it later, when we
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| 220 | * get actual touch data.
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| 221 |
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| 222 | if (mt && *pval >= 0 && *pval < mt->num_slots)
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| 223 | mt->slot = *pval;
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| 224 |
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| 225 | return INPUT_IGNORE_EVENT;
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| 226 | }
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| 227 |
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| 228 | is_mt_event = input_is_mt_value(code);
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| 229 |
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| 230 | if (!is_mt_event) {
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| 231 | pold = &dev->absinfo[code].value;
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| 232 | } else if (mt) {
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| 233 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
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| 234 | } else {
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| 235 | |
| 236 | * Bypass filtering for multi-touch events when
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| 237 | * not employing slots.
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| 238 |
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| 239 | pold = NULL;
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| 240 | }
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| 241 |
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| 242 | if (pold) {
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| 243 | *pval = input_defuzz_abs_event(*pval, *pold,
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| 244 | dev->absinfo[code].fuzz);
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| 245 | if (*pold == *pval)
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| 246 | return INPUT_IGNORE_EVENT;
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| 247 |
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| 248 | *pold = *pval;
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| 249 | }
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| 250 |
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| 251 |
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| 252 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
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| 253 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
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| 254 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
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| 255 | }
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| 256 |
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| 257 | return INPUT_PASS_TO_HANDLERS;
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| 258 | }
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| 259 |
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| 260 | static int input_get_disposition(struct input_dev *dev,
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| 261 | unsigned int type, unsigned int code, int *pval)
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| 262 | {
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| 263 | int disposition = INPUT_IGNORE_EVENT;
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| 264 | int value = *pval;
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| 265 |
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| 266 | switch (type) {
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| 267 |
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| 268 | case EV_SYN:
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| 269 | switch (code) {
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| 270 | case SYN_CONFIG:
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| 271 | disposition = INPUT_PASS_TO_ALL;
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| 272 | break;
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| 273 |
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| 274 | case SYN_REPORT:
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| 275 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
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| 276 | break;
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| 277 | case SYN_MT_REPORT:
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| 278 | disposition = INPUT_PASS_TO_HANDLERS;
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| 279 | break;
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| 280 | }
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| 281 | break;
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| 282 |
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| 283 | case EV_KEY:
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| 284 | if (is_event_supported(code, dev->keybit, KEY_MAX)) {
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| 285 |
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| 286 |
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| 287 | if (value == 2) {
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| 288 | disposition = INPUT_PASS_TO_HANDLERS;
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| 289 | break;
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| 290 | }
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| 291 |
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| 292 | if (!!test_bit(code, dev->key) != !!value) {
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| 293 |
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| 294 | __change_bit(code, dev->key);
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| 295 | disposition = INPUT_PASS_TO_HANDLERS;
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| 296 | }
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| 297 | }
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| 298 | break;
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| 299 |
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| 300 | case EV_SW:
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| 301 | if (is_event_supported(code, dev->swbit, SW_MAX) &&
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| 302 | !!test_bit(code, dev->sw) != !!value) {
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| 303 |
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| 304 | __change_bit(code, dev->sw);
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| 305 | disposition = INPUT_PASS_TO_HANDLERS;
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| 306 | }
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| 307 | break;
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| 308 |
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| 309 | case EV_ABS:
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| 310 | if (is_event_supported(code, dev->absbit, ABS_MAX))
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| 311 | disposition = input_handle_abs_event(dev, code, &value);
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| 312 |
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| 313 | break;
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| 314 |
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| 315 | case EV_REL:
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| 316 | if (is_event_supported(code, dev->relbit, REL_MAX) && value)
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| 317 | disposition = INPUT_PASS_TO_HANDLERS;
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| 318 |
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| 319 | break;
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| 320 |
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| 321 | case EV_MSC:
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| 322 | if (is_event_supported(code, dev->mscbit, MSC_MAX))
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| 323 | disposition = INPUT_PASS_TO_ALL;
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| 324 |
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| 325 | break;
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| 326 |
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| 327 | case EV_LED:
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| 328 | if (is_event_supported(code, dev->ledbit, LED_MAX) &&
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| 329 | !!test_bit(code, dev->led) != !!value) {
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| 330 |
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| 331 | __change_bit(code, dev->led);
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| 332 | disposition = INPUT_PASS_TO_ALL;
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| 333 | }
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| 334 | break;
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| 335 |
|
| 336 | case EV_SND:
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| 337 | if (is_event_supported(code, dev->sndbit, SND_MAX)) {
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| 338 |
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| 339 | if (!!test_bit(code, dev->snd) != !!value)
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| 340 | __change_bit(code, dev->snd);
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| 341 | disposition = INPUT_PASS_TO_ALL;
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| 342 | }
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| 343 | break;
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| 344 |
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| 345 | case EV_REP:
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| 346 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
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| 347 | dev->rep[code] = value;
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| 348 | disposition = INPUT_PASS_TO_ALL;
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| 349 | }
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| 350 | break;
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| 351 |
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| 352 | case EV_FF:
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| 353 | if (value >= 0)
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| 354 | disposition = INPUT_PASS_TO_ALL;
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| 355 | break;
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| 356 |
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| 357 | case EV_PWR:
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| 358 | disposition = INPUT_PASS_TO_ALL;
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| 359 | break;
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| 360 | }
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| 361 |
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| 362 | *pval = value;
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| 363 | return disposition;
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| 364 | }
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| 365 |
|
| 366 | static void input_handle_event(struct input_dev *dev,
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| 367 | unsigned int type, unsigned int code, int value)
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| 368 | {
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| 369 | int disposition = input_get_disposition(dev, type, code, &value);
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| 370 |
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| 371 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
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| 372 | add_input_randomness(type, code, value);
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| 373 |
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| 374 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
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| 375 | dev->event(dev, type, code, value);
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| 376 |
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| 377 | if (!dev->vals)
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| 378 | return;
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| 379 |
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| 380 | if (disposition & INPUT_PASS_TO_HANDLERS) {
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| 381 | struct input_value *v;
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| 382 |
|
| 383 | if (disposition & INPUT_SLOT) {
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| 384 | v = &dev->vals[dev->num_vals++];
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| 385 | v->type = EV_ABS;
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| 386 | v->code = ABS_MT_SLOT;
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| 387 | v->value = dev->mt->slot;
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| 388 | }
|
| 389 |
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| 390 | v = &dev->vals[dev->num_vals++];
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| 391 | v->type = type;
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| 392 | v->code = code;
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| 393 | v->value = value;
|
| 394 | }
|
| 395 |
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| 396 | if (disposition & INPUT_FLUSH) {
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| 397 | if (dev->num_vals >= 2)
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| 398 | input_pass_values(dev, dev->vals, dev->num_vals);
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| 399 | dev->num_vals = 0;
|
| 400 | |
| 401 | * Reset the timestamp on flush so we won't end up
|
| 402 | * with a stale one. Note we only need to reset the
|
| 403 | * monolithic one as we use its presence when deciding
|
| 404 | * whether to generate a synthetic timestamp.
|
| 405 |
|
| 406 | dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0);
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| 407 | } else if (dev->num_vals >= dev->max_vals - 2) {
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| 408 | dev->vals[dev->num_vals++] = input_value_sync;
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| 409 | input_pass_values(dev, dev->vals, dev->num_vals);
|
| 410 | dev->num_vals = 0;
|
| 411 | }
|
| 412 |
|
| 413 | }
|
| 414 |
|
| 415 | |
| 416 | * input_event() - report new input event
|
| 417 | * @dev: device that generated the event
|
| 418 | * @type: type of the event
|
| 419 | * @code: event code
|
| 420 | * @value: value of the event
|
| 421 | *
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| 422 | * This function should be used by drivers implementing various input
|
| 423 | * devices to report input events. See also input_inject_event().
|
| 424 | *
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| 425 | * NOTE: input_event() may be safely used right after input device was
|
| 426 | * allocated with input_allocate_device(), even before it is registered
|
| 427 | * with input_register_device(), but the event will not reach any of the
|
| 428 | * input handlers. Such early invocation of input_event() may be used
|
| 429 | * to 'seed' initial state of a switch or initial position of absolute
|
| 430 | * axis, etc.
|
| 431 |
|
| 432 | void input_event(struct input_dev *dev,
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| 433 | unsigned int type, unsigned int code, int value)
|
| 434 | {
|
| 435 | unsigned long flags;
|
| 436 |
|
| 437 | if (is_event_supported(type, dev->evbit, EV_MAX)) {
|
| 438 |
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| 439 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 440 | input_handle_event(dev, type, code, value);
|
| 441 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 442 | }
|
| 443 | }
|
| 444 | EXPORT_SYMBOL(input_event);
|
| 445 |
|
| 446 | |
| 447 | * input_inject_event() - send input event from input handler
|
| 448 | * @handle: input handle to send event through
|
| 449 | * @type: type of the event
|
| 450 | * @code: event code
|
| 451 | * @value: value of the event
|
| 452 | *
|
| 453 | * Similar to input_event() but will ignore event if device is
|
| 454 | * "grabbed" and handle injecting event is not the one that owns
|
| 455 | * the device.
|
| 456 |
|
| 457 | void input_inject_event(struct input_handle *handle,
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| 458 | unsigned int type, unsigned int code, int value)
|
| 459 | {
|
| 460 | struct input_dev *dev = handle->dev;
|
| 461 | struct input_handle *grab;
|
| 462 | unsigned long flags;
|
| 463 |
|
| 464 | if (is_event_supported(type, dev->evbit, EV_MAX)) {
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| 465 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 466 |
|
| 467 | rcu_read_lock();
|
| 468 | grab = rcu_dereference(dev->grab);
|
| 469 | if (!grab || grab == handle)
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| 470 | input_handle_event(dev, type, code, value);
|
| 471 | rcu_read_unlock();
|
| 472 |
|
| 473 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 474 | }
|
| 475 | }
|
| 476 | EXPORT_SYMBOL(input_inject_event);
|
| 477 |
|
| 478 | |
| 479 | * input_alloc_absinfo - allocates array of input_absinfo structs
|
| 480 | * @dev: the input device emitting absolute events
|
| 481 | *
|
| 482 | * If the absinfo struct the caller asked for is already allocated, this
|
| 483 | * functions will not do anything.
|
| 484 |
|
| 485 | void input_alloc_absinfo(struct input_dev *dev)
|
| 486 | {
|
| 487 | if (dev->absinfo)
|
| 488 | return;
|
| 489 |
|
| 490 | dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL);
|
| 491 | if (!dev->absinfo) {
|
| 492 | dev_err(dev->dev.parent ?: &dev->dev,
|
| 493 | "%s: unable to allocate memory\n", __func__);
|
| 494 | |
| 495 | * We will handle this allocation failure in
|
| 496 | * input_register_device() when we refuse to register input
|
| 497 | * device with ABS bits but without absinfo.
|
| 498 |
|
| 499 | }
|
| 500 | }
|
| 501 | EXPORT_SYMBOL(input_alloc_absinfo);
|
| 502 |
|
| 503 | void input_set_abs_params(struct input_dev *dev, unsigned int axis,
|
| 504 | int min, int max, int fuzz, int flat)
|
| 505 | {
|
| 506 | struct input_absinfo *absinfo;
|
| 507 |
|
| 508 | input_alloc_absinfo(dev);
|
| 509 | if (!dev->absinfo)
|
| 510 | return;
|
| 511 |
|
| 512 | absinfo = &dev->absinfo[axis];
|
| 513 | absinfo->minimum = min;
|
| 514 | absinfo->maximum = max;
|
| 515 | absinfo->fuzz = fuzz;
|
| 516 | absinfo->flat = flat;
|
| 517 |
|
| 518 | __set_bit(EV_ABS, dev->evbit);
|
| 519 | __set_bit(axis, dev->absbit);
|
| 520 | }
|
| 521 | EXPORT_SYMBOL(input_set_abs_params);
|
| 522 |
|
| 523 |
|
| 524 | |
| 525 | * input_grab_device - grabs device for exclusive use
|
| 526 | * @handle: input handle that wants to own the device
|
| 527 | *
|
| 528 | * When a device is grabbed by an input handle all events generated by
|
| 529 | * the device are delivered only to this handle. Also events injected
|
| 530 | * by other input handles are ignored while device is grabbed.
|
| 531 |
|
| 532 | int input_grab_device(struct input_handle *handle)
|
| 533 | {
|
| 534 | struct input_dev *dev = handle->dev;
|
| 535 | int retval;
|
| 536 |
|
| 537 | retval = mutex_lock_interruptible(&dev->mutex);
|
| 538 | if (retval)
|
| 539 | return retval;
|
| 540 |
|
| 541 | if (dev->grab) {
|
| 542 | retval = -EBUSY;
|
| 543 | goto out;
|
| 544 | }
|
| 545 |
|
| 546 | rcu_assign_pointer(dev->grab, handle);
|
| 547 |
|
| 548 | out:
|
| 549 | mutex_unlock(&dev->mutex);
|
| 550 | return retval;
|
| 551 | }
|
| 552 | EXPORT_SYMBOL(input_grab_device);
|
| 553 |
|
| 554 | static void __input_release_device(struct input_handle *handle)
|
| 555 | {
|
| 556 | struct input_dev *dev = handle->dev;
|
| 557 | struct input_handle *grabber;
|
| 558 |
|
| 559 | grabber = rcu_dereference_protected(dev->grab,
|
| 560 | lockdep_is_held(&dev->mutex));
|
| 561 | if (grabber == handle) {
|
| 562 | rcu_assign_pointer(dev->grab, NULL);
|
| 563 |
|
| 564 | synchronize_rcu();
|
| 565 |
|
| 566 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 567 | if (handle->open && handle->handler->start)
|
| 568 | handle->handler->start(handle);
|
| 569 | }
|
| 570 | }
|
| 571 |
|
| 572 | |
| 573 | * input_release_device - release previously grabbed device
|
| 574 | * @handle: input handle that owns the device
|
| 575 | *
|
| 576 | * Releases previously grabbed device so that other input handles can
|
| 577 | * start receiving input events. Upon release all handlers attached
|
| 578 | * to the device have their start() method called so they have a change
|
| 579 | * to synchronize device state with the rest of the system.
|
| 580 |
|
| 581 | void input_release_device(struct input_handle *handle)
|
| 582 | {
|
| 583 | struct input_dev *dev = handle->dev;
|
| 584 |
|
| 585 | mutex_lock(&dev->mutex);
|
| 586 | __input_release_device(handle);
|
| 587 | mutex_unlock(&dev->mutex);
|
| 588 | }
|
| 589 | EXPORT_SYMBOL(input_release_device);
|
| 590 |
|
| 591 | |
| 592 | * input_open_device - open input device
|
| 593 | * @handle: handle through which device is being accessed
|
| 594 | *
|
| 595 | * This function should be called by input handlers when they
|
| 596 | * want to start receive events from given input device.
|
| 597 |
|
| 598 | int input_open_device(struct input_handle *handle)
|
| 599 | {
|
| 600 | struct input_dev *dev = handle->dev;
|
| 601 | int retval;
|
| 602 |
|
| 603 | retval = mutex_lock_interruptible(&dev->mutex);
|
| 604 | if (retval)
|
| 605 | return retval;
|
| 606 |
|
| 607 | if (dev->going_away) {
|
| 608 | retval = -ENODEV;
|
| 609 | goto out;
|
| 610 | }
|
| 611 |
|
| 612 | handle->open++;
|
| 613 |
|
| 614 | if (dev->users++) {
|
| 615 | |
| 616 | * Device is already opened, so we can exit immediately and
|
| 617 | * report success.
|
| 618 |
|
| 619 | goto out;
|
| 620 | }
|
| 621 |
|
| 622 | if (dev->open) {
|
| 623 | retval = dev->open(dev);
|
| 624 | if (retval) {
|
| 625 | dev->users--;
|
| 626 | handle->open--;
|
| 627 | |
| 628 | * Make sure we are not delivering any more events
|
| 629 | * through this handle
|
| 630 |
|
| 631 | synchronize_rcu();
|
| 632 | goto out;
|
| 633 | }
|
| 634 | }
|
| 635 |
|
| 636 | if (dev->poller)
|
| 637 | input_dev_poller_start(dev->poller);
|
| 638 |
|
| 639 | out:
|
| 640 | mutex_unlock(&dev->mutex);
|
| 641 | return retval;
|
| 642 | }
|
| 643 | EXPORT_SYMBOL(input_open_device);
|
| 644 |
|
| 645 | int input_flush_device(struct input_handle *handle, struct file *file)
|
| 646 | {
|
| 647 | struct input_dev *dev = handle->dev;
|
| 648 | int retval;
|
| 649 |
|
| 650 | retval = mutex_lock_interruptible(&dev->mutex);
|
| 651 | if (retval)
|
| 652 | return retval;
|
| 653 |
|
| 654 | if (dev->flush)
|
| 655 | retval = dev->flush(dev, file);
|
| 656 |
|
| 657 | mutex_unlock(&dev->mutex);
|
| 658 | return retval;
|
| 659 | }
|
| 660 | EXPORT_SYMBOL(input_flush_device);
|
| 661 |
|
| 662 | |
| 663 | * input_close_device - close input device
|
| 664 | * @handle: handle through which device is being accessed
|
| 665 | *
|
| 666 | * This function should be called by input handlers when they
|
| 667 | * want to stop receive events from given input device.
|
| 668 |
|
| 669 | void input_close_device(struct input_handle *handle)
|
| 670 | {
|
| 671 | struct input_dev *dev = handle->dev;
|
| 672 |
|
| 673 | mutex_lock(&dev->mutex);
|
| 674 |
|
| 675 | __input_release_device(handle);
|
| 676 |
|
| 677 | if (!--dev->users) {
|
| 678 | if (dev->poller)
|
| 679 | input_dev_poller_stop(dev->poller);
|
| 680 |
|
| 681 | if (dev->close)
|
| 682 | dev->close(dev);
|
| 683 | }
|
| 684 |
|
| 685 | if (!--handle->open) {
|
| 686 | |
| 687 | * synchronize_rcu() makes sure that input_pass_event()
|
| 688 | * completed and that no more input events are delivered
|
| 689 | * through this handle
|
| 690 |
|
| 691 | synchronize_rcu();
|
| 692 | }
|
| 693 |
|
| 694 | mutex_unlock(&dev->mutex);
|
| 695 | }
|
| 696 | EXPORT_SYMBOL(input_close_device);
|
| 697 |
|
| 698 | |
| 699 | * Simulate keyup events for all keys that are marked as pressed.
|
| 700 | * The function must be called with dev->event_lock held.
|
| 701 |
|
| 702 | static void input_dev_release_keys(struct input_dev *dev)
|
| 703 | {
|
| 704 | bool need_sync = false;
|
| 705 | int code;
|
| 706 |
|
| 707 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
|
| 708 | for_each_set_bit(code, dev->key, KEY_CNT) {
|
| 709 | input_pass_event(dev, EV_KEY, code, 0);
|
| 710 | need_sync = true;
|
| 711 | }
|
| 712 |
|
| 713 | if (need_sync)
|
| 714 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
|
| 715 |
|
| 716 | memset(dev->key, 0, sizeof(dev->key));
|
| 717 | }
|
| 718 | }
|
| 719 |
|
| 720 | |
| 721 | * Prepare device for unregistering
|
| 722 |
|
| 723 | static void input_disconnect_device(struct input_dev *dev)
|
| 724 | {
|
| 725 | struct input_handle *handle;
|
| 726 |
|
| 727 | |
| 728 | * Mark device as going away. Note that we take dev->mutex here
|
| 729 | * not to protect access to dev->going_away but rather to ensure
|
| 730 | * that there are no threads in the middle of input_open_device()
|
| 731 |
|
| 732 | mutex_lock(&dev->mutex);
|
| 733 | dev->going_away = true;
|
| 734 | mutex_unlock(&dev->mutex);
|
| 735 |
|
| 736 | spin_lock_irq(&dev->event_lock);
|
| 737 |
|
| 738 | |
| 739 | * Simulate keyup events for all pressed keys so that handlers
|
| 740 | * are not left with "stuck" keys. The driver may continue
|
| 741 | * generate events even after we done here but they will not
|
| 742 | * reach any handlers.
|
| 743 |
|
| 744 | input_dev_release_keys(dev);
|
| 745 |
|
| 746 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 747 | handle->open = 0;
|
| 748 |
|
| 749 | spin_unlock_irq(&dev->event_lock);
|
| 750 | }
|
| 751 |
|
| 752 | |
| 753 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
|
| 754 | * @ke: keymap entry containing scancode to be converted.
|
| 755 | * @scancode: pointer to the location where converted scancode should
|
| 756 | * be stored.
|
| 757 | *
|
| 758 | * This function is used to convert scancode stored in &struct keymap_entry
|
| 759 | * into scalar form understood by legacy keymap handling methods. These
|
| 760 | * methods expect scancodes to be represented as 'unsigned int'.
|
| 761 |
|
| 762 | int input_scancode_to_scalar(const struct input_keymap_entry *ke,
|
| 763 | unsigned int *scancode)
|
| 764 | {
|
| 765 | switch (ke->len) {
|
| 766 | case 1:
|
| 767 | *scancode = *((u8 *)ke->scancode);
|
| 768 | break;
|
| 769 |
|
| 770 | case 2:
|
| 771 | *scancode = *((u16 *)ke->scancode);
|
| 772 | break;
|
| 773 |
|
| 774 | case 4:
|
| 775 | *scancode = *((u32 *)ke->scancode);
|
| 776 | break;
|
| 777 |
|
| 778 | default:
|
| 779 | return -EINVAL;
|
| 780 | }
|
| 781 |
|
| 782 | return 0;
|
| 783 | }
|
| 784 | EXPORT_SYMBOL(input_scancode_to_scalar);
|
| 785 |
|
| 786 | |
| 787 | * Those routines handle the default case where no [gs]etkeycode() is
|
| 788 | * defined. In this case, an array indexed by the scancode is used.
|
| 789 |
|
| 790 |
|
| 791 | static unsigned int input_fetch_keycode(struct input_dev *dev,
|
| 792 | unsigned int index)
|
| 793 | {
|
| 794 | switch (dev->keycodesize) {
|
| 795 | case 1:
|
| 796 | return ((u8 *)dev->keycode)[index];
|
| 797 |
|
| 798 | case 2:
|
| 799 | return ((u16 *)dev->keycode)[index];
|
| 800 |
|
| 801 | default:
|
| 802 | return ((u32 *)dev->keycode)[index];
|
| 803 | }
|
| 804 | }
|
| 805 |
|
| 806 | static int input_default_getkeycode(struct input_dev *dev,
|
| 807 | struct input_keymap_entry *ke)
|
| 808 | {
|
| 809 | unsigned int index;
|
| 810 | int error;
|
| 811 |
|
| 812 | if (!dev->keycodesize)
|
| 813 | return -EINVAL;
|
| 814 |
|
| 815 | if (ke->flags & INPUT_KEYMAP_BY_INDEX)
|
| 816 | index = ke->index;
|
| 817 | else {
|
| 818 | error = input_scancode_to_scalar(ke, &index);
|
| 819 | if (error)
|
| 820 | return error;
|
| 821 | }
|
| 822 |
|
| 823 | if (index >= dev->keycodemax)
|
| 824 | return -EINVAL;
|
| 825 |
|
| 826 | ke->keycode = input_fetch_keycode(dev, index);
|
| 827 | ke->index = index;
|
| 828 | ke->len = sizeof(index);
|
| 829 | memcpy(ke->scancode, &index, sizeof(index));
|
| 830 |
|
| 831 | return 0;
|
| 832 | }
|
| 833 |
|
| 834 | static int input_default_setkeycode(struct input_dev *dev,
|
| 835 | const struct input_keymap_entry *ke,
|
| 836 | unsigned int *old_keycode)
|
| 837 | {
|
| 838 | unsigned int index;
|
| 839 | int error;
|
| 840 | int i;
|
| 841 |
|
| 842 | if (!dev->keycodesize)
|
| 843 | return -EINVAL;
|
| 844 |
|
| 845 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
|
| 846 | index = ke->index;
|
| 847 | } else {
|
| 848 | error = input_scancode_to_scalar(ke, &index);
|
| 849 | if (error)
|
| 850 | return error;
|
| 851 | }
|
| 852 |
|
| 853 | if (index >= dev->keycodemax)
|
| 854 | return -EINVAL;
|
| 855 |
|
| 856 | if (dev->keycodesize < sizeof(ke->keycode) &&
|
| 857 | (ke->keycode >> (dev->keycodesize * 8)))
|
| 858 | return -EINVAL;
|
| 859 |
|
| 860 | switch (dev->keycodesize) {
|
| 861 | case 1: {
|
| 862 | u8 *k = (u8 *)dev->keycode;
|
| 863 | *old_keycode = k[index];
|
| 864 | k[index] = ke->keycode;
|
| 865 | break;
|
| 866 | }
|
| 867 | case 2: {
|
| 868 | u16 *k = (u16 *)dev->keycode;
|
| 869 | *old_keycode = k[index];
|
| 870 | k[index] = ke->keycode;
|
| 871 | break;
|
| 872 | }
|
| 873 | default: {
|
| 874 | u32 *k = (u32 *)dev->keycode;
|
| 875 | *old_keycode = k[index];
|
| 876 | k[index] = ke->keycode;
|
| 877 | break;
|
| 878 | }
|
| 879 | }
|
| 880 |
|
| 881 | __clear_bit(*old_keycode, dev->keybit);
|
| 882 | __set_bit(ke->keycode, dev->keybit);
|
| 883 |
|
| 884 | for (i = 0; i < dev->keycodemax; i++) {
|
| 885 | if (input_fetch_keycode(dev, i) == *old_keycode) {
|
| 886 | __set_bit(*old_keycode, dev->keybit);
|
| 887 | break;
|
| 888 | }
|
| 889 | }
|
| 890 |
|
| 891 | return 0;
|
| 892 | }
|
| 893 |
|
| 894 | |
| 895 | * input_get_keycode - retrieve keycode currently mapped to a given scancode
|
| 896 | * @dev: input device which keymap is being queried
|
| 897 | * @ke: keymap entry
|
| 898 | *
|
| 899 | * This function should be called by anyone interested in retrieving current
|
| 900 | * keymap. Presently evdev handlers use it.
|
| 901 |
|
| 902 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
|
| 903 | {
|
| 904 | unsigned long flags;
|
| 905 | int retval;
|
| 906 |
|
| 907 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 908 | retval = dev->getkeycode(dev, ke);
|
| 909 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 910 |
|
| 911 | return retval;
|
| 912 | }
|
| 913 | EXPORT_SYMBOL(input_get_keycode);
|
| 914 |
|
| 915 | |
| 916 | * input_set_keycode - attribute a keycode to a given scancode
|
| 917 | * @dev: input device which keymap is being updated
|
| 918 | * @ke: new keymap entry
|
| 919 | *
|
| 920 | * This function should be called by anyone needing to update current
|
| 921 | * keymap. Presently keyboard and evdev handlers use it.
|
| 922 |
|
| 923 | int input_set_keycode(struct input_dev *dev,
|
| 924 | const struct input_keymap_entry *ke)
|
| 925 | {
|
| 926 | unsigned long flags;
|
| 927 | unsigned int old_keycode;
|
| 928 | int retval;
|
| 929 |
|
| 930 | if (ke->keycode > KEY_MAX)
|
| 931 | return -EINVAL;
|
| 932 |
|
| 933 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 934 |
|
| 935 | retval = dev->setkeycode(dev, ke, &old_keycode);
|
| 936 | if (retval)
|
| 937 | goto out;
|
| 938 |
|
| 939 |
|
| 940 | __clear_bit(KEY_RESERVED, dev->keybit);
|
| 941 |
|
| 942 | |
| 943 | * Simulate keyup event if keycode is not present
|
| 944 | * in the keymap anymore
|
| 945 |
|
| 946 | if (test_bit(EV_KEY, dev->evbit) &&
|
| 947 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
|
| 948 | __test_and_clear_bit(old_keycode, dev->key)) {
|
| 949 | struct input_value vals[] = {
|
| 950 | { EV_KEY, old_keycode, 0 },
|
| 951 | input_value_sync
|
| 952 | };
|
| 953 |
|
| 954 | input_pass_values(dev, vals, ARRAY_SIZE(vals));
|
| 955 | }
|
| 956 |
|
| 957 | out:
|
| 958 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 959 |
|
| 960 | return retval;
|
| 961 | }
|
| 962 | EXPORT_SYMBOL(input_set_keycode);
|
| 963 |
|
| 964 | bool input_match_device_id(const struct input_dev *dev,
|
| 965 | const struct input_device_id *id)
|
| 966 | {
|
| 967 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
|
| 968 | if (id->bustype != dev->id.bustype)
|
| 969 | return false;
|
| 970 |
|
| 971 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
|
| 972 | if (id->vendor != dev->id.vendor)
|
| 973 | return false;
|
| 974 |
|
| 975 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
|
| 976 | if (id->product != dev->id.product)
|
| 977 | return false;
|
| 978 |
|
| 979 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
|
| 980 | if (id->version != dev->id.version)
|
| 981 | return false;
|
| 982 |
|
| 983 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
|
| 984 | !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
|
| 985 | !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
|
| 986 | !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
|
| 987 | !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
|
| 988 | !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
|
| 989 | !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
|
| 990 | !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
|
| 991 | !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||
|
| 992 | !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {
|
| 993 | return false;
|
| 994 | }
|
| 995 |
|
| 996 | return true;
|
| 997 | }
|
| 998 | EXPORT_SYMBOL(input_match_device_id);
|
| 999 |
|
| 1000 | static const struct input_device_id *input_match_device(struct input_handler *handler,
|
| 1001 | struct input_dev *dev)
|
| 1002 | {
|
| 1003 | const struct input_device_id *id;
|
| 1004 |
|
| 1005 | for (id = handler->id_table; id->flags || id->driver_info; id++) {
|
| 1006 | if (input_match_device_id(dev, id) &&
|
| 1007 | (!handler->match || handler->match(handler, dev))) {
|
| 1008 | return id;
|
| 1009 | }
|
| 1010 | }
|
| 1011 |
|
| 1012 | return NULL;
|
| 1013 | }
|
| 1014 |
|
| 1015 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
|
| 1016 | {
|
| 1017 | const struct input_device_id *id;
|
| 1018 | int error;
|
| 1019 |
|
| 1020 | id = input_match_device(handler, dev);
|
| 1021 | if (!id)
|
| 1022 | return -ENODEV;
|
| 1023 |
|
| 1024 | error = handler->connect(handler, dev, id);
|
| 1025 | if (error && error != -ENODEV)
|
| 1026 | pr_err("failed to attach handler %s to device %s, error: %d\n",
|
| 1027 | handler->name, kobject_name(&dev->dev.kobj), error);
|
| 1028 |
|
| 1029 | return error;
|
| 1030 | }
|
| 1031 |
|
| 1032 | #ifdef CONFIG_COMPAT
|
| 1033 |
|
| 1034 | static int input_bits_to_string(char *buf, int buf_size,
|
| 1035 | unsigned long bits, bool skip_empty)
|
| 1036 | {
|
| 1037 | int len = 0;
|
| 1038 |
|
| 1039 | if (in_compat_syscall()) {
|
| 1040 | u32 dword = bits >> 32;
|
| 1041 | if (dword || !skip_empty)
|
| 1042 | len += snprintf(buf, buf_size, "%x ", dword);
|
| 1043 |
|
| 1044 | dword = bits & 0xffffffffUL;
|
| 1045 | if (dword || !skip_empty || len)
|
| 1046 | len += snprintf(buf + len, max(buf_size - len, 0),
|
| 1047 | "%x", dword);
|
| 1048 | } else {
|
| 1049 | if (bits || !skip_empty)
|
| 1050 | len += snprintf(buf, buf_size, "%lx", bits);
|
| 1051 | }
|
| 1052 |
|
| 1053 | return len;
|
| 1054 | }
|
| 1055 |
|
| 1056 | #else
|
| 1057 |
|
| 1058 | static int input_bits_to_string(char *buf, int buf_size,
|
| 1059 | unsigned long bits, bool skip_empty)
|
| 1060 | {
|
| 1061 | return bits || !skip_empty ?
|
| 1062 | snprintf(buf, buf_size, "%lx", bits) : 0;
|
| 1063 | }
|
| 1064 |
|
| 1065 | #endif
|
| 1066 |
|
| 1067 | #ifdef CONFIG_PROC_FS
|
| 1068 |
|
| 1069 | static struct proc_dir_entry *proc_bus_input_dir;
|
| 1070 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
|
| 1071 | static int input_devices_state;
|
| 1072 |
|
| 1073 | static inline void input_wakeup_procfs_readers(void)
|
| 1074 | {
|
| 1075 | input_devices_state++;
|
| 1076 | wake_up(&input_devices_poll_wait);
|
| 1077 | }
|
| 1078 |
|
| 1079 | static __poll_t input_proc_devices_poll(struct file *file, poll_table *wait)
|
| 1080 | {
|
| 1081 | poll_wait(file, &input_devices_poll_wait, wait);
|
| 1082 | if (file->f_version != input_devices_state) {
|
| 1083 | file->f_version = input_devices_state;
|
| 1084 | return EPOLLIN | EPOLLRDNORM;
|
| 1085 | }
|
| 1086 |
|
| 1087 | return 0;
|
| 1088 | }
|
| 1089 |
|
| 1090 | union input_seq_state {
|
| 1091 | struct {
|
| 1092 | unsigned short pos;
|
| 1093 | bool mutex_acquired;
|
| 1094 | };
|
| 1095 | void *p;
|
| 1096 | };
|
| 1097 |
|
| 1098 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
|
| 1099 | {
|
| 1100 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1101 | int error;
|
| 1102 |
|
| 1103 |
|
| 1104 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
|
| 1105 |
|
| 1106 | error = mutex_lock_interruptible(&input_mutex);
|
| 1107 | if (error) {
|
| 1108 | state->mutex_acquired = false;
|
| 1109 | return ERR_PTR(error);
|
| 1110 | }
|
| 1111 |
|
| 1112 | state->mutex_acquired = true;
|
| 1113 |
|
| 1114 | return seq_list_start(&input_dev_list, *pos);
|
| 1115 | }
|
| 1116 |
|
| 1117 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 1118 | {
|
| 1119 | return seq_list_next(v, &input_dev_list, pos);
|
| 1120 | }
|
| 1121 |
|
| 1122 | static void input_seq_stop(struct seq_file *seq, void *v)
|
| 1123 | {
|
| 1124 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1125 |
|
| 1126 | if (state->mutex_acquired)
|
| 1127 | mutex_unlock(&input_mutex);
|
| 1128 | }
|
| 1129 |
|
| 1130 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
|
| 1131 | unsigned long *bitmap, int max)
|
| 1132 | {
|
| 1133 | int i;
|
| 1134 | bool skip_empty = true;
|
| 1135 | char buf[18];
|
| 1136 |
|
| 1137 | seq_printf(seq, "B: %s=", name);
|
| 1138 |
|
| 1139 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
|
| 1140 | if (input_bits_to_string(buf, sizeof(buf),
|
| 1141 | bitmap[i], skip_empty)) {
|
| 1142 | skip_empty = false;
|
| 1143 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
|
| 1144 | }
|
| 1145 | }
|
| 1146 |
|
| 1147 | |
| 1148 | * If no output was produced print a single 0.
|
| 1149 |
|
| 1150 | if (skip_empty)
|
| 1151 | seq_putc(seq, '0');
|
| 1152 |
|
| 1153 | seq_putc(seq, '\n');
|
| 1154 | }
|
| 1155 |
|
| 1156 | static int input_devices_seq_show(struct seq_file *seq, void *v)
|
| 1157 | {
|
| 1158 | struct input_dev *dev = container_of(v, struct input_dev, node);
|
| 1159 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
| 1160 | struct input_handle *handle;
|
| 1161 |
|
| 1162 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
|
| 1163 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
|
| 1164 |
|
| 1165 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
|
| 1166 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
|
| 1167 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
|
| 1168 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
|
| 1169 | seq_puts(seq, "H: Handlers=");
|
| 1170 |
|
| 1171 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 1172 | seq_printf(seq, "%s ", handle->name);
|
| 1173 | seq_putc(seq, '\n');
|
| 1174 |
|
| 1175 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
|
| 1176 |
|
| 1177 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
|
| 1178 | if (test_bit(EV_KEY, dev->evbit))
|
| 1179 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
|
| 1180 | if (test_bit(EV_REL, dev->evbit))
|
| 1181 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
|
| 1182 | if (test_bit(EV_ABS, dev->evbit))
|
| 1183 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
|
| 1184 | if (test_bit(EV_MSC, dev->evbit))
|
| 1185 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
|
| 1186 | if (test_bit(EV_LED, dev->evbit))
|
| 1187 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
|
| 1188 | if (test_bit(EV_SND, dev->evbit))
|
| 1189 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
|
| 1190 | if (test_bit(EV_FF, dev->evbit))
|
| 1191 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
|
| 1192 | if (test_bit(EV_SW, dev->evbit))
|
| 1193 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
|
| 1194 |
|
| 1195 | seq_putc(seq, '\n');
|
| 1196 |
|
| 1197 | kfree(path);
|
| 1198 | return 0;
|
| 1199 | }
|
| 1200 |
|
| 1201 | static const struct seq_operations input_devices_seq_ops = {
|
| 1202 | .start = input_devices_seq_start,
|
| 1203 | .next = input_devices_seq_next,
|
| 1204 | .stop = input_seq_stop,
|
| 1205 | .show = input_devices_seq_show,
|
| 1206 | };
|
| 1207 |
|
| 1208 | static int input_proc_devices_open(struct inode *inode, struct file *file)
|
| 1209 | {
|
| 1210 | return seq_open(file, &input_devices_seq_ops);
|
| 1211 | }
|
| 1212 |
|
| 1213 | static const struct file_operations input_devices_fileops = {
|
| 1214 | .owner = THIS_MODULE,
|
| 1215 | .open = input_proc_devices_open,
|
| 1216 | .poll = input_proc_devices_poll,
|
| 1217 | .read = seq_read,
|
| 1218 | .llseek = seq_lseek,
|
| 1219 | .release = seq_release,
|
| 1220 | };
|
| 1221 |
|
| 1222 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
|
| 1223 | {
|
| 1224 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1225 | int error;
|
| 1226 |
|
| 1227 |
|
| 1228 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
|
| 1229 |
|
| 1230 | error = mutex_lock_interruptible(&input_mutex);
|
| 1231 | if (error) {
|
| 1232 | state->mutex_acquired = false;
|
| 1233 | return ERR_PTR(error);
|
| 1234 | }
|
| 1235 |
|
| 1236 | state->mutex_acquired = true;
|
| 1237 | state->pos = *pos;
|
| 1238 |
|
| 1239 | return seq_list_start(&input_handler_list, *pos);
|
| 1240 | }
|
| 1241 |
|
| 1242 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 1243 | {
|
| 1244 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1245 |
|
| 1246 | state->pos = *pos + 1;
|
| 1247 | return seq_list_next(v, &input_handler_list, pos);
|
| 1248 | }
|
| 1249 |
|
| 1250 | static int input_handlers_seq_show(struct seq_file *seq, void *v)
|
| 1251 | {
|
| 1252 | struct input_handler *handler = container_of(v, struct input_handler, node);
|
| 1253 | union input_seq_state *state = (union input_seq_state *)&seq->private;
|
| 1254 |
|
| 1255 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
|
| 1256 | if (handler->filter)
|
| 1257 | seq_puts(seq, " (filter)");
|
| 1258 | if (handler->legacy_minors)
|
| 1259 | seq_printf(seq, " Minor=%d", handler->minor);
|
| 1260 | seq_putc(seq, '\n');
|
| 1261 |
|
| 1262 | return 0;
|
| 1263 | }
|
| 1264 |
|
| 1265 | static const struct seq_operations input_handlers_seq_ops = {
|
| 1266 | .start = input_handlers_seq_start,
|
| 1267 | .next = input_handlers_seq_next,
|
| 1268 | .stop = input_seq_stop,
|
| 1269 | .show = input_handlers_seq_show,
|
| 1270 | };
|
| 1271 |
|
| 1272 | static int input_proc_handlers_open(struct inode *inode, struct file *file)
|
| 1273 | {
|
| 1274 | return seq_open(file, &input_handlers_seq_ops);
|
| 1275 | }
|
| 1276 |
|
| 1277 | static const struct file_operations input_handlers_fileops = {
|
| 1278 | .owner = THIS_MODULE,
|
| 1279 | .open = input_proc_handlers_open,
|
| 1280 | .read = seq_read,
|
| 1281 | .llseek = seq_lseek,
|
| 1282 | .release = seq_release,
|
| 1283 | };
|
| 1284 |
|
| 1285 | static int __init input_proc_init(void)
|
| 1286 | {
|
| 1287 | struct proc_dir_entry *entry;
|
| 1288 |
|
| 1289 | proc_bus_input_dir = proc_mkdir("bus/input", NULL);
|
| 1290 | if (!proc_bus_input_dir)
|
| 1291 | return -ENOMEM;
|
| 1292 |
|
| 1293 | entry = proc_create("devices", 0, proc_bus_input_dir,
|
| 1294 | &input_devices_fileops);
|
| 1295 | if (!entry)
|
| 1296 | goto fail1;
|
| 1297 |
|
| 1298 | entry = proc_create("handlers", 0, proc_bus_input_dir,
|
| 1299 | &input_handlers_fileops);
|
| 1300 | if (!entry)
|
| 1301 | goto fail2;
|
| 1302 |
|
| 1303 | return 0;
|
| 1304 |
|
| 1305 | fail2: remove_proc_entry("devices", proc_bus_input_dir);
|
| 1306 | fail1: remove_proc_entry("bus/input", NULL);
|
| 1307 | return -ENOMEM;
|
| 1308 | }
|
| 1309 |
|
| 1310 | static void input_proc_exit(void)
|
| 1311 | {
|
| 1312 | remove_proc_entry("devices", proc_bus_input_dir);
|
| 1313 | remove_proc_entry("handlers", proc_bus_input_dir);
|
| 1314 | remove_proc_entry("bus/input", NULL);
|
| 1315 | }
|
| 1316 |
|
| 1317 | #else
|
| 1318 | static inline void input_wakeup_procfs_readers(void) { }
|
| 1319 | static inline int input_proc_init(void) { return 0; }
|
| 1320 | static inline void input_proc_exit(void) { }
|
| 1321 | #endif
|
| 1322 |
|
| 1323 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \
|
| 1324 | static ssize_t input_dev_show_##name(struct device *dev, \
|
| 1325 | struct device_attribute *attr, \
|
| 1326 | char *buf) \
|
| 1327 | { \
|
| 1328 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1329 | \
|
| 1330 | return scnprintf(buf, PAGE_SIZE, "%s\n", \
|
| 1331 | input_dev->name ? input_dev->name : ""); \
|
| 1332 | } \
|
| 1333 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
|
| 1334 |
|
| 1335 | INPUT_DEV_STRING_ATTR_SHOW(name);
|
| 1336 | INPUT_DEV_STRING_ATTR_SHOW(phys);
|
| 1337 | INPUT_DEV_STRING_ATTR_SHOW(uniq);
|
| 1338 |
|
| 1339 | static int input_print_modalias_bits(char *buf, int size,
|
| 1340 | char name, unsigned long *bm,
|
| 1341 | unsigned int min_bit, unsigned int max_bit)
|
| 1342 | {
|
| 1343 | int len = 0, i;
|
| 1344 |
|
| 1345 | len += snprintf(buf, max(size, 0), "%c", name);
|
| 1346 | for (i = min_bit; i < max_bit; i++)
|
| 1347 | if (bm[BIT_WORD(i)] & BIT_MASK(i))
|
| 1348 | len += snprintf(buf + len, max(size - len, 0), "%X,", i);
|
| 1349 | return len;
|
| 1350 | }
|
| 1351 |
|
| 1352 | static int input_print_modalias(char *buf, int size, struct input_dev *id,
|
| 1353 | int add_cr)
|
| 1354 | {
|
| 1355 | int len;
|
| 1356 |
|
| 1357 | len = snprintf(buf, max(size, 0),
|
| 1358 | "input:b%04Xv%04Xp%04Xe%04X-",
|
| 1359 | id->id.bustype, id->id.vendor,
|
| 1360 | id->id.product, id->id.version);
|
| 1361 |
|
| 1362 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1363 | 'e', id->evbit, 0, EV_MAX);
|
| 1364 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1365 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
|
| 1366 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1367 | 'r', id->relbit, 0, REL_MAX);
|
| 1368 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1369 | 'a', id->absbit, 0, ABS_MAX);
|
| 1370 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1371 | 'm', id->mscbit, 0, MSC_MAX);
|
| 1372 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1373 | 'l', id->ledbit, 0, LED_MAX);
|
| 1374 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1375 | 's', id->sndbit, 0, SND_MAX);
|
| 1376 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1377 | 'f', id->ffbit, 0, FF_MAX);
|
| 1378 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1379 | 'w', id->swbit, 0, SW_MAX);
|
| 1380 |
|
| 1381 | if (add_cr)
|
| 1382 | len += snprintf(buf + len, max(size - len, 0), "\n");
|
| 1383 |
|
| 1384 | return len;
|
| 1385 | }
|
| 1386 |
|
| 1387 | static ssize_t input_dev_show_modalias(struct device *dev,
|
| 1388 | struct device_attribute *attr,
|
| 1389 | char *buf)
|
| 1390 | {
|
| 1391 | struct input_dev *id = to_input_dev(dev);
|
| 1392 | ssize_t len;
|
| 1393 |
|
| 1394 | len = input_print_modalias(buf, PAGE_SIZE, id, 1);
|
| 1395 |
|
| 1396 | return min_t(int, len, PAGE_SIZE);
|
| 1397 | }
|
| 1398 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
|
| 1399 |
|
| 1400 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
|
| 1401 | int max, int add_cr);
|
| 1402 |
|
| 1403 | static ssize_t input_dev_show_properties(struct device *dev,
|
| 1404 | struct device_attribute *attr,
|
| 1405 | char *buf)
|
| 1406 | {
|
| 1407 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1408 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
|
| 1409 | INPUT_PROP_MAX, true);
|
| 1410 | return min_t(int, len, PAGE_SIZE);
|
| 1411 | }
|
| 1412 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
|
| 1413 |
|
| 1414 | static struct attribute *input_dev_attrs[] = {
|
| 1415 | &dev_attr_name.attr,
|
| 1416 | &dev_attr_phys.attr,
|
| 1417 | &dev_attr_uniq.attr,
|
| 1418 | &dev_attr_modalias.attr,
|
| 1419 | &dev_attr_properties.attr,
|
| 1420 | NULL
|
| 1421 | };
|
| 1422 |
|
| 1423 | static const struct attribute_group input_dev_attr_group = {
|
| 1424 | .attrs = input_dev_attrs,
|
| 1425 | };
|
| 1426 |
|
| 1427 | #define INPUT_DEV_ID_ATTR(name) \
|
| 1428 | static ssize_t input_dev_show_id_##name(struct device *dev, \
|
| 1429 | struct device_attribute *attr, \
|
| 1430 | char *buf) \
|
| 1431 | { \
|
| 1432 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1433 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
|
| 1434 | } \
|
| 1435 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
|
| 1436 |
|
| 1437 | INPUT_DEV_ID_ATTR(bustype);
|
| 1438 | INPUT_DEV_ID_ATTR(vendor);
|
| 1439 | INPUT_DEV_ID_ATTR(product);
|
| 1440 | INPUT_DEV_ID_ATTR(version);
|
| 1441 |
|
| 1442 | static struct attribute *input_dev_id_attrs[] = {
|
| 1443 | &dev_attr_bustype.attr,
|
| 1444 | &dev_attr_vendor.attr,
|
| 1445 | &dev_attr_product.attr,
|
| 1446 | &dev_attr_version.attr,
|
| 1447 | NULL
|
| 1448 | };
|
| 1449 |
|
| 1450 | static const struct attribute_group input_dev_id_attr_group = {
|
| 1451 | .name = "id",
|
| 1452 | .attrs = input_dev_id_attrs,
|
| 1453 | };
|
| 1454 |
|
| 1455 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
|
| 1456 | int max, int add_cr)
|
| 1457 | {
|
| 1458 | int i;
|
| 1459 | int len = 0;
|
| 1460 | bool skip_empty = true;
|
| 1461 |
|
| 1462 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
|
| 1463 | len += input_bits_to_string(buf + len, max(buf_size - len, 0),
|
| 1464 | bitmap[i], skip_empty);
|
| 1465 | if (len) {
|
| 1466 | skip_empty = false;
|
| 1467 | if (i > 0)
|
| 1468 | len += snprintf(buf + len, max(buf_size - len, 0), " ");
|
| 1469 | }
|
| 1470 | }
|
| 1471 |
|
| 1472 | |
| 1473 | * If no output was produced print a single 0.
|
| 1474 |
|
| 1475 | if (len == 0)
|
| 1476 | len = snprintf(buf, buf_size, "%d", 0);
|
| 1477 |
|
| 1478 | if (add_cr)
|
| 1479 | len += snprintf(buf + len, max(buf_size - len, 0), "\n");
|
| 1480 |
|
| 1481 | return len;
|
| 1482 | }
|
| 1483 |
|
| 1484 | #define INPUT_DEV_CAP_ATTR(ev, bm) \
|
| 1485 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \
|
| 1486 | struct device_attribute *attr, \
|
| 1487 | char *buf) \
|
| 1488 | { \
|
| 1489 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1490 | int len = input_print_bitmap(buf, PAGE_SIZE, \
|
| 1491 | input_dev->bm##bit, ev##_MAX, \
|
| 1492 | true); \
|
| 1493 | return min_t(int, len, PAGE_SIZE); \
|
| 1494 | } \
|
| 1495 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
|
| 1496 |
|
| 1497 | INPUT_DEV_CAP_ATTR(EV, ev);
|
| 1498 | INPUT_DEV_CAP_ATTR(KEY, key);
|
| 1499 | INPUT_DEV_CAP_ATTR(REL, rel);
|
| 1500 | INPUT_DEV_CAP_ATTR(ABS, abs);
|
| 1501 | INPUT_DEV_CAP_ATTR(MSC, msc);
|
| 1502 | INPUT_DEV_CAP_ATTR(LED, led);
|
| 1503 | INPUT_DEV_CAP_ATTR(SND, snd);
|
| 1504 | INPUT_DEV_CAP_ATTR(FF, ff);
|
| 1505 | INPUT_DEV_CAP_ATTR(SW, sw);
|
| 1506 |
|
| 1507 | static struct attribute *input_dev_caps_attrs[] = {
|
| 1508 | &dev_attr_ev.attr,
|
| 1509 | &dev_attr_key.attr,
|
| 1510 | &dev_attr_rel.attr,
|
| 1511 | &dev_attr_abs.attr,
|
| 1512 | &dev_attr_msc.attr,
|
| 1513 | &dev_attr_led.attr,
|
| 1514 | &dev_attr_snd.attr,
|
| 1515 | &dev_attr_ff.attr,
|
| 1516 | &dev_attr_sw.attr,
|
| 1517 | NULL
|
| 1518 | };
|
| 1519 |
|
| 1520 | static const struct attribute_group input_dev_caps_attr_group = {
|
| 1521 | .name = "capabilities",
|
| 1522 | .attrs = input_dev_caps_attrs,
|
| 1523 | };
|
| 1524 |
|
| 1525 | static const struct attribute_group *input_dev_attr_groups[] = {
|
| 1526 | &input_dev_attr_group,
|
| 1527 | &input_dev_id_attr_group,
|
| 1528 | &input_dev_caps_attr_group,
|
| 1529 | &input_poller_attribute_group,
|
| 1530 | NULL
|
| 1531 | };
|
| 1532 |
|
| 1533 | static void input_dev_release(struct device *device)
|
| 1534 | {
|
| 1535 | struct input_dev *dev = to_input_dev(device);
|
| 1536 |
|
| 1537 | input_ff_destroy(dev);
|
| 1538 | input_mt_destroy_slots(dev);
|
| 1539 | kfree(dev->poller);
|
| 1540 | kfree(dev->absinfo);
|
| 1541 | kfree(dev->vals);
|
| 1542 | kfree(dev);
|
| 1543 |
|
| 1544 | module_put(THIS_MODULE);
|
| 1545 | }
|
| 1546 |
|
| 1547 | |
| 1548 | * Input uevent interface - loading event handlers based on
|
| 1549 | * device bitfields.
|
| 1550 |
|
| 1551 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
|
| 1552 | const char *name, unsigned long *bitmap, int max)
|
| 1553 | {
|
| 1554 | int len;
|
| 1555 |
|
| 1556 | if (add_uevent_var(env, "%s", name))
|
| 1557 | return -ENOMEM;
|
| 1558 |
|
| 1559 | len = input_print_bitmap(&env->buf[env->buflen - 1],
|
| 1560 | sizeof(env->buf) - env->buflen,
|
| 1561 | bitmap, max, false);
|
| 1562 | if (len >= (sizeof(env->buf) - env->buflen))
|
| 1563 | return -ENOMEM;
|
| 1564 |
|
| 1565 | env->buflen += len;
|
| 1566 | return 0;
|
| 1567 | }
|
| 1568 |
|
| 1569 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
|
| 1570 | struct input_dev *dev)
|
| 1571 | {
|
| 1572 | int len;
|
| 1573 |
|
| 1574 | if (add_uevent_var(env, "MODALIAS="))
|
| 1575 | return -ENOMEM;
|
| 1576 |
|
| 1577 | len = input_print_modalias(&env->buf[env->buflen - 1],
|
| 1578 | sizeof(env->buf) - env->buflen,
|
| 1579 | dev, 0);
|
| 1580 | if (len >= (sizeof(env->buf) - env->buflen))
|
| 1581 | return -ENOMEM;
|
| 1582 |
|
| 1583 | env->buflen += len;
|
| 1584 | return 0;
|
| 1585 | }
|
| 1586 |
|
| 1587 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
|
| 1588 | do { \
|
| 1589 | int err = add_uevent_var(env, fmt, val); \
|
| 1590 | if (err) \
|
| 1591 | return err; \
|
| 1592 | } while (0)
|
| 1593 |
|
| 1594 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
|
| 1595 | do { \
|
| 1596 | int err = input_add_uevent_bm_var(env, name, bm, max); \
|
| 1597 | if (err) \
|
| 1598 | return err; \
|
| 1599 | } while (0)
|
| 1600 |
|
| 1601 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
|
| 1602 | do { \
|
| 1603 | int err = input_add_uevent_modalias_var(env, dev); \
|
| 1604 | if (err) \
|
| 1605 | return err; \
|
| 1606 | } while (0)
|
| 1607 |
|
| 1608 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
|
| 1609 | {
|
| 1610 | struct input_dev *dev = to_input_dev(device);
|
| 1611 |
|
| 1612 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
|
| 1613 | dev->id.bustype, dev->id.vendor,
|
| 1614 | dev->id.product, dev->id.version);
|
| 1615 | if (dev->name)
|
| 1616 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
|
| 1617 | if (dev->phys)
|
| 1618 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
|
| 1619 | if (dev->uniq)
|
| 1620 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
|
| 1621 |
|
| 1622 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
|
| 1623 |
|
| 1624 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
|
| 1625 | if (test_bit(EV_KEY, dev->evbit))
|
| 1626 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
|
| 1627 | if (test_bit(EV_REL, dev->evbit))
|
| 1628 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
|
| 1629 | if (test_bit(EV_ABS, dev->evbit))
|
| 1630 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
|
| 1631 | if (test_bit(EV_MSC, dev->evbit))
|
| 1632 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
|
| 1633 | if (test_bit(EV_LED, dev->evbit))
|
| 1634 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
|
| 1635 | if (test_bit(EV_SND, dev->evbit))
|
| 1636 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
|
| 1637 | if (test_bit(EV_FF, dev->evbit))
|
| 1638 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
|
| 1639 | if (test_bit(EV_SW, dev->evbit))
|
| 1640 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
|
| 1641 |
|
| 1642 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
|
| 1643 |
|
| 1644 | return 0;
|
| 1645 | }
|
| 1646 |
|
| 1647 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \
|
| 1648 | do { \
|
| 1649 | int i; \
|
| 1650 | bool active; \
|
| 1651 | \
|
| 1652 | if (!test_bit(EV_##type, dev->evbit)) \
|
| 1653 | break; \
|
| 1654 | \
|
| 1655 | for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
|
| 1656 | active = test_bit(i, dev->bits); \
|
| 1657 | if (!active && !on) \
|
| 1658 | continue; \
|
| 1659 | \
|
| 1660 | dev->event(dev, EV_##type, i, on ? active : 0); \
|
| 1661 | } \
|
| 1662 | } while (0)
|
| 1663 |
|
| 1664 | static void input_dev_toggle(struct input_dev *dev, bool activate)
|
| 1665 | {
|
| 1666 | if (!dev->event)
|
| 1667 | return;
|
| 1668 |
|
| 1669 | INPUT_DO_TOGGLE(dev, LED, led, activate);
|
| 1670 | INPUT_DO_TOGGLE(dev, SND, snd, activate);
|
| 1671 |
|
| 1672 | if (activate && test_bit(EV_REP, dev->evbit)) {
|
| 1673 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
|
| 1674 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
|
| 1675 | }
|
| 1676 | }
|
| 1677 |
|
| 1678 | |
| 1679 | * input_reset_device() - reset/restore the state of input device
|
| 1680 | * @dev: input device whose state needs to be reset
|
| 1681 | *
|
| 1682 | * This function tries to reset the state of an opened input device and
|
| 1683 | * bring internal state and state if the hardware in sync with each other.
|
| 1684 | * We mark all keys as released, restore LED state, repeat rate, etc.
|
| 1685 |
|
| 1686 | void input_reset_device(struct input_dev *dev)
|
| 1687 | {
|
| 1688 | unsigned long flags;
|
| 1689 |
|
| 1690 | mutex_lock(&dev->mutex);
|
| 1691 | spin_lock_irqsave(&dev->event_lock, flags);
|
| 1692 |
|
| 1693 | input_dev_toggle(dev, true);
|
| 1694 | input_dev_release_keys(dev);
|
| 1695 |
|
| 1696 | spin_unlock_irqrestore(&dev->event_lock, flags);
|
| 1697 | mutex_unlock(&dev->mutex);
|
| 1698 | }
|
| 1699 | EXPORT_SYMBOL(input_reset_device);
|
| 1700 |
|
| 1701 | #ifdef CONFIG_PM_SLEEP
|
| 1702 | static int input_dev_suspend(struct device *dev)
|
| 1703 | {
|
| 1704 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1705 |
|
| 1706 | spin_lock_irq(&input_dev->event_lock);
|
| 1707 |
|
| 1708 | |
| 1709 | * Keys that are pressed now are unlikely to be
|
| 1710 | * still pressed when we resume.
|
| 1711 |
|
| 1712 | input_dev_release_keys(input_dev);
|
| 1713 |
|
| 1714 |
|
| 1715 | input_dev_toggle(input_dev, false);
|
| 1716 |
|
| 1717 | spin_unlock_irq(&input_dev->event_lock);
|
| 1718 |
|
| 1719 | return 0;
|
| 1720 | }
|
| 1721 |
|
| 1722 | static int input_dev_resume(struct device *dev)
|
| 1723 | {
|
| 1724 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1725 |
|
| 1726 | spin_lock_irq(&input_dev->event_lock);
|
| 1727 |
|
| 1728 |
|
| 1729 | input_dev_toggle(input_dev, true);
|
| 1730 |
|
| 1731 | spin_unlock_irq(&input_dev->event_lock);
|
| 1732 |
|
| 1733 | return 0;
|
| 1734 | }
|
| 1735 |
|
| 1736 | static int input_dev_freeze(struct device *dev)
|
| 1737 | {
|
| 1738 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1739 |
|
| 1740 | spin_lock_irq(&input_dev->event_lock);
|
| 1741 |
|
| 1742 | |
| 1743 | * Keys that are pressed now are unlikely to be
|
| 1744 | * still pressed when we resume.
|
| 1745 |
|
| 1746 | input_dev_release_keys(input_dev);
|
| 1747 |
|
| 1748 | spin_unlock_irq(&input_dev->event_lock);
|
| 1749 |
|
| 1750 | return 0;
|
| 1751 | }
|
| 1752 |
|
| 1753 | static int input_dev_poweroff(struct device *dev)
|
| 1754 | {
|
| 1755 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1756 |
|
| 1757 | spin_lock_irq(&input_dev->event_lock);
|
| 1758 |
|
| 1759 |
|
| 1760 | input_dev_toggle(input_dev, false);
|
| 1761 |
|
| 1762 | spin_unlock_irq(&input_dev->event_lock);
|
| 1763 |
|
| 1764 | return 0;
|
| 1765 | }
|
| 1766 |
|
| 1767 | static const struct dev_pm_ops input_dev_pm_ops = {
|
| 1768 | .suspend = input_dev_suspend,
|
| 1769 | .resume = input_dev_resume,
|
| 1770 | .freeze = input_dev_freeze,
|
| 1771 | .poweroff = input_dev_poweroff,
|
| 1772 | .restore = input_dev_resume,
|
| 1773 | };
|
| 1774 | #endif
|
| 1775 |
|
| 1776 | static const struct device_type input_dev_type = {
|
| 1777 | .groups = input_dev_attr_groups,
|
| 1778 | .release = input_dev_release,
|
| 1779 | .uevent = input_dev_uevent,
|
| 1780 | #ifdef CONFIG_PM_SLEEP
|
| 1781 | .pm = &input_dev_pm_ops,
|
| 1782 | #endif
|
| 1783 | };
|
| 1784 |
|
| 1785 | static char *input_devnode(struct device *dev, umode_t *mode)
|
| 1786 | {
|
| 1787 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
|
| 1788 | }
|
| 1789 |
|
| 1790 | struct class input_class = {
|
| 1791 | .name = "input",
|
| 1792 | .devnode = input_devnode,
|
| 1793 | };
|
| 1794 | EXPORT_SYMBOL_GPL(input_class);
|
| 1795 |
|
| 1796 | |
| 1797 | * input_allocate_device - allocate memory for new input device
|
| 1798 | *
|
| 1799 | * Returns prepared struct input_dev or %NULL.
|
| 1800 | *
|
| 1801 | * NOTE: Use input_free_device() to free devices that have not been
|
| 1802 | * registered; input_unregister_device() should be used for already
|
| 1803 | * registered devices.
|
| 1804 |
|
| 1805 | struct input_dev *input_allocate_device(void)
|
| 1806 | {
|
| 1807 | static atomic_t input_no = ATOMIC_INIT(-1);
|
| 1808 | struct input_dev *dev;
|
| 1809 |
|
| 1810 | dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
| 1811 | if (dev) {
|
| 1812 | dev->dev.type = &input_dev_type;
|
| 1813 | dev->dev.class = &input_class;
|
| 1814 | device_initialize(&dev->dev);
|
| 1815 | mutex_init(&dev->mutex);
|
| 1816 | spin_lock_init(&dev->event_lock);
|
| 1817 | timer_setup(&dev->timer, NULL, 0);
|
| 1818 | INIT_LIST_HEAD(&dev->h_list);
|
| 1819 | INIT_LIST_HEAD(&dev->node);
|
| 1820 |
|
| 1821 | dev_set_name(&dev->dev, "input%lu",
|
| 1822 | (unsigned long)atomic_inc_return(&input_no));
|
| 1823 |
|
| 1824 | __module_get(THIS_MODULE);
|
| 1825 | }
|
| 1826 |
|
| 1827 | return dev;
|
| 1828 | }
|
| 1829 | EXPORT_SYMBOL(input_allocate_device);
|
| 1830 |
|
| 1831 | struct input_devres {
|
| 1832 | struct input_dev *input;
|
| 1833 | };
|
| 1834 |
|
| 1835 | static int devm_input_device_match(struct device *dev, void *res, void *data)
|
| 1836 | {
|
| 1837 | struct input_devres *devres = res;
|
| 1838 |
|
| 1839 | return devres->input == data;
|
| 1840 | }
|
| 1841 |
|
| 1842 | static void devm_input_device_release(struct device *dev, void *res)
|
| 1843 | {
|
| 1844 | struct input_devres *devres = res;
|
| 1845 | struct input_dev *input = devres->input;
|
| 1846 |
|
| 1847 | dev_dbg(dev, "%s: dropping reference to %s\n",
|
| 1848 | __func__, dev_name(&input->dev));
|
| 1849 | input_put_device(input);
|
| 1850 | }
|
| 1851 |
|
| 1852 | |
| 1853 | * devm_input_allocate_device - allocate managed input device
|
| 1854 | * @dev: device owning the input device being created
|
| 1855 | *
|
| 1856 | * Returns prepared struct input_dev or %NULL.
|
| 1857 | *
|
| 1858 | * Managed input devices do not need to be explicitly unregistered or
|
| 1859 | * freed as it will be done automatically when owner device unbinds from
|
| 1860 | * its driver (or binding fails). Once managed input device is allocated,
|
| 1861 | * it is ready to be set up and registered in the same fashion as regular
|
| 1862 | * input device. There are no special devm_input_device_[un]register()
|
| 1863 | * variants, regular ones work with both managed and unmanaged devices,
|
| 1864 | * should you need them. In most cases however, managed input device need
|
| 1865 | * not be explicitly unregistered or freed.
|
| 1866 | *
|
| 1867 | * NOTE: the owner device is set up as parent of input device and users
|
| 1868 | * should not override it.
|
| 1869 |
|
| 1870 | struct input_dev *devm_input_allocate_device(struct device *dev)
|
| 1871 | {
|
| 1872 | struct input_dev *input;
|
| 1873 | struct input_devres *devres;
|
| 1874 |
|
| 1875 | devres = devres_alloc(devm_input_device_release,
|
| 1876 | sizeof(*devres), GFP_KERNEL);
|
| 1877 | if (!devres)
|
| 1878 | return NULL;
|
| 1879 |
|
| 1880 | input = input_allocate_device();
|
| 1881 | if (!input) {
|
| 1882 | devres_free(devres);
|
| 1883 | return NULL;
|
| 1884 | }
|
| 1885 |
|
| 1886 | input->dev.parent = dev;
|
| 1887 | input->devres_managed = true;
|
| 1888 |
|
| 1889 | devres->input = input;
|
| 1890 | devres_add(dev, devres);
|
| 1891 |
|
| 1892 | return input;
|
| 1893 | }
|
| 1894 | EXPORT_SYMBOL(devm_input_allocate_device);
|
| 1895 |
|
| 1896 | |
| 1897 | * input_free_device - free memory occupied by input_dev structure
|
| 1898 | * @dev: input device to free
|
| 1899 | *
|
| 1900 | * This function should only be used if input_register_device()
|
| 1901 | * was not called yet or if it failed. Once device was registered
|
| 1902 | * use input_unregister_device() and memory will be freed once last
|
| 1903 | * reference to the device is dropped.
|
| 1904 | *
|
| 1905 | * Device should be allocated by input_allocate_device().
|
| 1906 | *
|
| 1907 | * NOTE: If there are references to the input device then memory
|
| 1908 | * will not be freed until last reference is dropped.
|
| 1909 |
|
| 1910 | void input_free_device(struct input_dev *dev)
|
| 1911 | {
|
| 1912 | if (dev) {
|
| 1913 | if (dev->devres_managed)
|
| 1914 | WARN_ON(devres_destroy(dev->dev.parent,
|
| 1915 | devm_input_device_release,
|
| 1916 | devm_input_device_match,
|
| 1917 | dev));
|
| 1918 | input_put_device(dev);
|
| 1919 | }
|
| 1920 | }
|
| 1921 | EXPORT_SYMBOL(input_free_device);
|
| 1922 |
|
| 1923 | |
| 1924 | * input_set_timestamp - set timestamp for input events
|
| 1925 | * @dev: input device to set timestamp for
|
| 1926 | * @timestamp: the time at which the event has occurred
|
| 1927 | * in CLOCK_MONOTONIC
|
| 1928 | *
|
| 1929 | * This function is intended to provide to the input system a more
|
| 1930 | * accurate time of when an event actually occurred. The driver should
|
| 1931 | * call this function as soon as a timestamp is acquired ensuring
|
| 1932 | * clock conversions in input_set_timestamp are done correctly.
|
| 1933 | *
|
| 1934 | * The system entering suspend state between timestamp acquisition and
|
| 1935 | * calling input_set_timestamp can result in inaccurate conversions.
|
| 1936 |
|
| 1937 | void input_set_timestamp(struct input_dev *dev, ktime_t timestamp)
|
| 1938 | {
|
| 1939 | dev->timestamp[INPUT_CLK_MONO] = timestamp;
|
| 1940 | dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp);
|
| 1941 | dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp,
|
| 1942 | TK_OFFS_BOOT);
|
| 1943 | }
|
| 1944 | EXPORT_SYMBOL(input_set_timestamp);
|
| 1945 |
|
| 1946 | |
| 1947 | * input_get_timestamp - get timestamp for input events
|
| 1948 | * @dev: input device to get timestamp from
|
| 1949 | *
|
| 1950 | * A valid timestamp is a timestamp of non-zero value.
|
| 1951 |
|
| 1952 | ktime_t *input_get_timestamp(struct input_dev *dev)
|
| 1953 | {
|
| 1954 | const ktime_t invalid_timestamp = ktime_set(0, 0);
|
| 1955 |
|
| 1956 | if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp))
|
| 1957 | input_set_timestamp(dev, ktime_get());
|
| 1958 |
|
| 1959 | return dev->timestamp;
|
| 1960 | }
|
| 1961 | EXPORT_SYMBOL(input_get_timestamp);
|
| 1962 |
|
| 1963 | |
| 1964 | * input_set_capability - mark device as capable of a certain event
|
| 1965 | * @dev: device that is capable of emitting or accepting event
|
| 1966 | * @type: type of the event (EV_KEY, EV_REL, etc...)
|
| 1967 | * @code: event code
|
| 1968 | *
|
| 1969 | * In addition to setting up corresponding bit in appropriate capability
|
| 1970 | * bitmap the function also adjusts dev->evbit.
|
| 1971 |
|
| 1972 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
|
| 1973 | {
|
| 1974 | switch (type) {
|
| 1975 | case EV_KEY:
|
| 1976 | __set_bit(code, dev->keybit);
|
| 1977 | break;
|
| 1978 |
|
| 1979 | case EV_REL:
|
| 1980 | __set_bit(code, dev->relbit);
|
| 1981 | break;
|
| 1982 |
|
| 1983 | case EV_ABS:
|
| 1984 | input_alloc_absinfo(dev);
|
| 1985 | if (!dev->absinfo)
|
| 1986 | return;
|
| 1987 |
|
| 1988 | __set_bit(code, dev->absbit);
|
| 1989 | break;
|
| 1990 |
|
| 1991 | case EV_MSC:
|
| 1992 | __set_bit(code, dev->mscbit);
|
| 1993 | break;
|
| 1994 |
|
| 1995 | case EV_SW:
|
| 1996 | __set_bit(code, dev->swbit);
|
| 1997 | break;
|
| 1998 |
|
| 1999 | case EV_LED:
|
| 2000 | __set_bit(code, dev->ledbit);
|
| 2001 | break;
|
| 2002 |
|
| 2003 | case EV_SND:
|
| 2004 | __set_bit(code, dev->sndbit);
|
| 2005 | break;
|
| 2006 |
|
| 2007 | case EV_FF:
|
| 2008 | __set_bit(code, dev->ffbit);
|
| 2009 | break;
|
| 2010 |
|
| 2011 | case EV_PWR:
|
| 2012 |
|
| 2013 | break;
|
| 2014 |
|
| 2015 | default:
|
| 2016 | pr_err("%s: unknown type %u (code %u)\n", __func__, type, code);
|
| 2017 | dump_stack();
|
| 2018 | return;
|
| 2019 | }
|
| 2020 |
|
| 2021 | __set_bit(type, dev->evbit);
|
| 2022 | }
|
| 2023 | EXPORT_SYMBOL(input_set_capability);
|
| 2024 |
|
| 2025 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
|
| 2026 | {
|
| 2027 | int mt_slots;
|
| 2028 | int i;
|
| 2029 | unsigned int events;
|
| 2030 |
|
| 2031 | if (dev->mt) {
|
| 2032 | mt_slots = dev->mt->num_slots;
|
| 2033 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
|
| 2034 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
|
| 2035 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
|
| 2036 | mt_slots = clamp(mt_slots, 2, 32);
|
| 2037 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
|
| 2038 | mt_slots = 2;
|
| 2039 | } else {
|
| 2040 | mt_slots = 0;
|
| 2041 | }
|
| 2042 |
|
| 2043 | events = mt_slots + 1;
|
| 2044 |
|
| 2045 | if (test_bit(EV_ABS, dev->evbit))
|
| 2046 | for_each_set_bit(i, dev->absbit, ABS_CNT)
|
| 2047 | events += input_is_mt_axis(i) ? mt_slots : 1;
|
| 2048 |
|
| 2049 | if (test_bit(EV_REL, dev->evbit))
|
| 2050 | events += bitmap_weight(dev->relbit, REL_CNT);
|
| 2051 |
|
| 2052 |
|
| 2053 | events += 7;
|
| 2054 |
|
| 2055 | return events;
|
| 2056 | }
|
| 2057 |
|
| 2058 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
|
| 2059 | do { \
|
| 2060 | if (!test_bit(EV_##type, dev->evbit)) \
|
| 2061 | memset(dev->bits##bit, 0, \
|
| 2062 | sizeof(dev->bits##bit)); \
|
| 2063 | } while (0)
|
| 2064 |
|
| 2065 | static void input_cleanse_bitmasks(struct input_dev *dev)
|
| 2066 | {
|
| 2067 | INPUT_CLEANSE_BITMASK(dev, KEY, key);
|
| 2068 | INPUT_CLEANSE_BITMASK(dev, REL, rel);
|
| 2069 | INPUT_CLEANSE_BITMASK(dev, ABS, abs);
|
| 2070 | INPUT_CLEANSE_BITMASK(dev, MSC, msc);
|
| 2071 | INPUT_CLEANSE_BITMASK(dev, LED, led);
|
| 2072 | INPUT_CLEANSE_BITMASK(dev, SND, snd);
|
| 2073 | INPUT_CLEANSE_BITMASK(dev, FF, ff);
|
| 2074 | INPUT_CLEANSE_BITMASK(dev, SW, sw);
|
| 2075 | }
|
| 2076 |
|
| 2077 | static void __input_unregister_device(struct input_dev *dev)
|
| 2078 | {
|
| 2079 | struct input_handle *handle, *next;
|
| 2080 |
|
| 2081 | input_disconnect_device(dev);
|
| 2082 |
|
| 2083 | mutex_lock(&input_mutex);
|
| 2084 |
|
| 2085 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
|
| 2086 | handle->handler->disconnect(handle);
|
| 2087 | WARN_ON(!list_empty(&dev->h_list));
|
| 2088 |
|
| 2089 | del_timer_sync(&dev->timer);
|
| 2090 | list_del_init(&dev->node);
|
| 2091 |
|
| 2092 | input_wakeup_procfs_readers();
|
| 2093 |
|
| 2094 | mutex_unlock(&input_mutex);
|
| 2095 |
|
| 2096 | device_del(&dev->dev);
|
| 2097 | }
|
| 2098 |
|
| 2099 | static void devm_input_device_unregister(struct device *dev, void *res)
|
| 2100 | {
|
| 2101 | struct input_devres *devres = res;
|
| 2102 | struct input_dev *input = devres->input;
|
| 2103 |
|
| 2104 | dev_dbg(dev, "%s: unregistering device %s\n",
|
| 2105 | __func__, dev_name(&input->dev));
|
| 2106 | __input_unregister_device(input);
|
| 2107 | }
|
| 2108 |
|
| 2109 | |
| 2110 | * input_enable_softrepeat - enable software autorepeat
|
| 2111 | * @dev: input device
|
| 2112 | * @delay: repeat delay
|
| 2113 | * @period: repeat period
|
| 2114 | *
|
| 2115 | * Enable software autorepeat on the input device.
|
| 2116 |
|
| 2117 | void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
|
| 2118 | {
|
| 2119 | dev->timer.function = input_repeat_key;
|
| 2120 | dev->rep[REP_DELAY] = delay;
|
| 2121 | dev->rep[REP_PERIOD] = period;
|
| 2122 | }
|
| 2123 | EXPORT_SYMBOL(input_enable_softrepeat);
|
| 2124 |
|
| 2125 | |
| 2126 | * input_register_device - register device with input core
|
| 2127 | * @dev: device to be registered
|
| 2128 | *
|
| 2129 | * This function registers device with input core. The device must be
|
| 2130 | * allocated with input_allocate_device() and all it's capabilities
|
| 2131 | * set up before registering.
|
| 2132 | * If function fails the device must be freed with input_free_device().
|
| 2133 | * Once device has been successfully registered it can be unregistered
|
| 2134 | * with input_unregister_device(); input_free_device() should not be
|
| 2135 | * called in this case.
|
| 2136 | *
|
| 2137 | * Note that this function is also used to register managed input devices
|
| 2138 | * (ones allocated with devm_input_allocate_device()). Such managed input
|
| 2139 | * devices need not be explicitly unregistered or freed, their tear down
|
| 2140 | * is controlled by the devres infrastructure. It is also worth noting
|
| 2141 | * that tear down of managed input devices is internally a 2-step process:
|
| 2142 | * registered managed input device is first unregistered, but stays in
|
| 2143 | * memory and can still handle input_event() calls (although events will
|
| 2144 | * not be delivered anywhere). The freeing of managed input device will
|
| 2145 | * happen later, when devres stack is unwound to the point where device
|
| 2146 | * allocation was made.
|
| 2147 |
|
| 2148 | int input_register_device(struct input_dev *dev)
|
| 2149 | {
|
| 2150 | struct input_devres *devres = NULL;
|
| 2151 | struct input_handler *handler;
|
| 2152 | unsigned int packet_size;
|
| 2153 | const char *path;
|
| 2154 | int error;
|
| 2155 |
|
| 2156 | if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
|
| 2157 | dev_err(&dev->dev,
|
| 2158 | "Absolute device without dev->absinfo, refusing to register\n");
|
| 2159 | return -EINVAL;
|
| 2160 | }
|
| 2161 |
|
| 2162 | if (dev->devres_managed) {
|
| 2163 | devres = devres_alloc(devm_input_device_unregister,
|
| 2164 | sizeof(*devres), GFP_KERNEL);
|
| 2165 | if (!devres)
|
| 2166 | return -ENOMEM;
|
| 2167 |
|
| 2168 | devres->input = dev;
|
| 2169 | }
|
| 2170 |
|
| 2171 |
|
| 2172 | __set_bit(EV_SYN, dev->evbit);
|
| 2173 |
|
| 2174 |
|
| 2175 | __clear_bit(KEY_RESERVED, dev->keybit);
|
| 2176 |
|
| 2177 |
|
| 2178 | input_cleanse_bitmasks(dev);
|
| 2179 |
|
| 2180 | packet_size = input_estimate_events_per_packet(dev);
|
| 2181 | if (dev->hint_events_per_packet < packet_size)
|
| 2182 | dev->hint_events_per_packet = packet_size;
|
| 2183 |
|
| 2184 | dev->max_vals = dev->hint_events_per_packet + 2;
|
| 2185 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
|
| 2186 | if (!dev->vals) {
|
| 2187 | error = -ENOMEM;
|
| 2188 | goto err_devres_free;
|
| 2189 | }
|
| 2190 |
|
| 2191 | |
| 2192 | * If delay and period are pre-set by the driver, then autorepeating
|
| 2193 | * is handled by the driver itself and we don't do it in input.c.
|
| 2194 |
|
| 2195 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
|
| 2196 | input_enable_softrepeat(dev, 250, 33);
|
| 2197 |
|
| 2198 | if (!dev->getkeycode)
|
| 2199 | dev->getkeycode = input_default_getkeycode;
|
| 2200 |
|
| 2201 | if (!dev->setkeycode)
|
| 2202 | dev->setkeycode = input_default_setkeycode;
|
| 2203 |
|
| 2204 | if (dev->poller)
|
| 2205 | input_dev_poller_finalize(dev->poller);
|
| 2206 |
|
| 2207 | error = device_add(&dev->dev);
|
| 2208 | if (error)
|
| 2209 | goto err_free_vals;
|
| 2210 |
|
| 2211 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
| 2212 | pr_info("%s as %s\n",
|
| 2213 | dev->name ? dev->name : "Unspecified device",
|
| 2214 | path ? path : "N/A");
|
| 2215 | kfree(path);
|
| 2216 |
|
| 2217 | error = mutex_lock_interruptible(&input_mutex);
|
| 2218 | if (error)
|
| 2219 | goto err_device_del;
|
| 2220 |
|
| 2221 | list_add_tail(&dev->node, &input_dev_list);
|
| 2222 |
|
| 2223 | list_for_each_entry(handler, &input_handler_list, node)
|
| 2224 | input_attach_handler(dev, handler);
|
| 2225 |
|
| 2226 | input_wakeup_procfs_readers();
|
| 2227 |
|
| 2228 | mutex_unlock(&input_mutex);
|
| 2229 |
|
| 2230 | if (dev->devres_managed) {
|
| 2231 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
|
| 2232 | __func__, dev_name(&dev->dev));
|
| 2233 | devres_add(dev->dev.parent, devres);
|
| 2234 | }
|
| 2235 | return 0;
|
| 2236 |
|
| 2237 | err_device_del:
|
| 2238 | device_del(&dev->dev);
|
| 2239 | err_free_vals:
|
| 2240 | kfree(dev->vals);
|
| 2241 | dev->vals = NULL;
|
| 2242 | err_devres_free:
|
| 2243 | devres_free(devres);
|
| 2244 | return error;
|
| 2245 | }
|
| 2246 | EXPORT_SYMBOL(input_register_device);
|
| 2247 |
|
| 2248 | |
| 2249 | * input_unregister_device - unregister previously registered device
|
| 2250 | * @dev: device to be unregistered
|
| 2251 | *
|
| 2252 | * This function unregisters an input device. Once device is unregistered
|
| 2253 | * the caller should not try to access it as it may get freed at any moment.
|
| 2254 |
|
| 2255 | void input_unregister_device(struct input_dev *dev)
|
| 2256 | {
|
| 2257 | if (dev->devres_managed) {
|
| 2258 | WARN_ON(devres_destroy(dev->dev.parent,
|
| 2259 | devm_input_device_unregister,
|
| 2260 | devm_input_device_match,
|
| 2261 | dev));
|
| 2262 | __input_unregister_device(dev);
|
| 2263 | |
| 2264 | * We do not do input_put_device() here because it will be done
|
| 2265 | * when 2nd devres fires up.
|
| 2266 |
|
| 2267 | } else {
|
| 2268 | __input_unregister_device(dev);
|
| 2269 | input_put_device(dev);
|
| 2270 | }
|
| 2271 | }
|
| 2272 | EXPORT_SYMBOL(input_unregister_device);
|
| 2273 |
|
| 2274 | |
| 2275 | * input_register_handler - register a new input handler
|
| 2276 | * @handler: handler to be registered
|
| 2277 | *
|
| 2278 | * This function registers a new input handler (interface) for input
|
| 2279 | * devices in the system and attaches it to all input devices that
|
| 2280 | * are compatible with the handler.
|
| 2281 |
|
| 2282 | int input_register_handler(struct input_handler *handler)
|
| 2283 | {
|
| 2284 | struct input_dev *dev;
|
| 2285 | int error;
|
| 2286 |
|
| 2287 | error = mutex_lock_interruptible(&input_mutex);
|
| 2288 | if (error)
|
| 2289 | return error;
|
| 2290 |
|
| 2291 | INIT_LIST_HEAD(&handler->h_list);
|
| 2292 |
|
| 2293 | list_add_tail(&handler->node, &input_handler_list);
|
| 2294 |
|
| 2295 | list_for_each_entry(dev, &input_dev_list, node)
|
| 2296 | input_attach_handler(dev, handler);
|
| 2297 |
|
| 2298 | input_wakeup_procfs_readers();
|
| 2299 |
|
| 2300 | mutex_unlock(&input_mutex);
|
| 2301 | return 0;
|
| 2302 | }
|
| 2303 | EXPORT_SYMBOL(input_register_handler);
|
| 2304 |
|
| 2305 | |
| 2306 | * input_unregister_handler - unregisters an input handler
|
| 2307 | * @handler: handler to be unregistered
|
| 2308 | *
|
| 2309 | * This function disconnects a handler from its input devices and
|
| 2310 | * removes it from lists of known handlers.
|
| 2311 |
|
| 2312 | void input_unregister_handler(struct input_handler *handler)
|
| 2313 | {
|
| 2314 | struct input_handle *handle, *next;
|
| 2315 |
|
| 2316 | mutex_lock(&input_mutex);
|
| 2317 |
|
| 2318 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
|
| 2319 | handler->disconnect(handle);
|
| 2320 | WARN_ON(!list_empty(&handler->h_list));
|
| 2321 |
|
| 2322 | list_del_init(&handler->node);
|
| 2323 |
|
| 2324 | input_wakeup_procfs_readers();
|
| 2325 |
|
| 2326 | mutex_unlock(&input_mutex);
|
| 2327 | }
|
| 2328 | EXPORT_SYMBOL(input_unregister_handler);
|
| 2329 |
|
| 2330 | |
| 2331 | * input_handler_for_each_handle - handle iterator
|
| 2332 | * @handler: input handler to iterate
|
| 2333 | * @data: data for the callback
|
| 2334 | * @fn: function to be called for each handle
|
| 2335 | *
|
| 2336 | * Iterate over @bus's list of devices, and call @fn for each, passing
|
| 2337 | * it @data and stop when @fn returns a non-zero value. The function is
|
| 2338 | * using RCU to traverse the list and therefore may be using in atomic
|
| 2339 | * contexts. The @fn callback is invoked from RCU critical section and
|
| 2340 | * thus must not sleep.
|
| 2341 |
|
| 2342 | int input_handler_for_each_handle(struct input_handler *handler, void *data,
|
| 2343 | int (*fn)(struct input_handle *, void *))
|
| 2344 | {
|
| 2345 | struct input_handle *handle;
|
| 2346 | int retval = 0;
|
| 2347 |
|
| 2348 | rcu_read_lock();
|
| 2349 |
|
| 2350 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
|
| 2351 | retval = fn(handle, data);
|
| 2352 | if (retval)
|
| 2353 | break;
|
| 2354 | }
|
| 2355 |
|
| 2356 | rcu_read_unlock();
|
| 2357 |
|
| 2358 | return retval;
|
| 2359 | }
|
| 2360 | EXPORT_SYMBOL(input_handler_for_each_handle);
|
| 2361 |
|
| 2362 | |
| 2363 | * input_register_handle - register a new input handle
|
| 2364 | * @handle: handle to register
|
| 2365 | *
|
| 2366 | * This function puts a new input handle onto device's
|
| 2367 | * and handler's lists so that events can flow through
|
| 2368 | * it once it is opened using input_open_device().
|
| 2369 | *
|
| 2370 | * This function is supposed to be called from handler's
|
| 2371 | * connect() method.
|
| 2372 |
|
| 2373 | int input_register_handle(struct input_handle *handle)
|
| 2374 | {
|
| 2375 | struct input_handler *handler = handle->handler;
|
| 2376 | struct input_dev *dev = handle->dev;
|
| 2377 | int error;
|
| 2378 |
|
| 2379 | |
| 2380 | * We take dev->mutex here to prevent race with
|
| 2381 | * input_release_device().
|
| 2382 |
|
| 2383 | error = mutex_lock_interruptible(&dev->mutex);
|
| 2384 | if (error)
|
| 2385 | return error;
|
| 2386 |
|
| 2387 | |
| 2388 | * Filters go to the head of the list, normal handlers
|
| 2389 | * to the tail.
|
| 2390 |
|
| 2391 | if (handler->filter)
|
| 2392 | list_add_rcu(&handle->d_node, &dev->h_list);
|
| 2393 | else
|
| 2394 | list_add_tail_rcu(&handle->d_node, &dev->h_list);
|
| 2395 |
|
| 2396 | mutex_unlock(&dev->mutex);
|
| 2397 |
|
| 2398 | |
| 2399 | * Since we are supposed to be called from ->connect()
|
| 2400 | * which is mutually exclusive with ->disconnect()
|
| 2401 | * we can't be racing with input_unregister_handle()
|
| 2402 | * and so separate lock is not needed here.
|
| 2403 |
|
| 2404 | list_add_tail_rcu(&handle->h_node, &handler->h_list);
|
| 2405 |
|
| 2406 | if (handler->start)
|
| 2407 | handler->start(handle);
|
| 2408 |
|
| 2409 | return 0;
|
| 2410 | }
|
| 2411 | EXPORT_SYMBOL(input_register_handle);
|
| 2412 |
|
| 2413 | |
| 2414 | * input_unregister_handle - unregister an input handle
|
| 2415 | * @handle: handle to unregister
|
| 2416 | *
|
| 2417 | * This function removes input handle from device's
|
| 2418 | * and handler's lists.
|
| 2419 | *
|
| 2420 | * This function is supposed to be called from handler's
|
| 2421 | * disconnect() method.
|
| 2422 |
|
| 2423 | void input_unregister_handle(struct input_handle *handle)
|
| 2424 | {
|
| 2425 | struct input_dev *dev = handle->dev;
|
| 2426 |
|
| 2427 | list_del_rcu(&handle->h_node);
|
| 2428 |
|
| 2429 | |
| 2430 | * Take dev->mutex to prevent race with input_release_device().
|
| 2431 |
|
| 2432 | mutex_lock(&dev->mutex);
|
| 2433 | list_del_rcu(&handle->d_node);
|
| 2434 | mutex_unlock(&dev->mutex);
|
| 2435 |
|
| 2436 | synchronize_rcu();
|
| 2437 | }
|
| 2438 | EXPORT_SYMBOL(input_unregister_handle);
|
| 2439 |
|
| 2440 | |
| 2441 | * input_get_new_minor - allocates a new input minor number
|
| 2442 | * @legacy_base: beginning or the legacy range to be searched
|
| 2443 | * @legacy_num: size of legacy range
|
| 2444 | * @allow_dynamic: whether we can also take ID from the dynamic range
|
| 2445 | *
|
| 2446 | * This function allocates a new device minor for from input major namespace.
|
| 2447 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num
|
| 2448 | * parameters and whether ID can be allocated from dynamic range if there are
|
| 2449 | * no free IDs in legacy range.
|
| 2450 |
|
| 2451 | int input_get_new_minor(int legacy_base, unsigned int legacy_num,
|
| 2452 | bool allow_dynamic)
|
| 2453 | {
|
| 2454 | |
| 2455 | * This function should be called from input handler's ->connect()
|
| 2456 | * methods, which are serialized with input_mutex, so no additional
|
| 2457 | * locking is needed here.
|
| 2458 |
|
| 2459 | if (legacy_base >= 0) {
|
| 2460 | int minor = ida_simple_get(&input_ida,
|
| 2461 | legacy_base,
|
| 2462 | legacy_base + legacy_num,
|
| 2463 | GFP_KERNEL);
|
| 2464 | if (minor >= 0 || !allow_dynamic)
|
| 2465 | return minor;
|
| 2466 | }
|
| 2467 |
|
| 2468 | return ida_simple_get(&input_ida,
|
| 2469 | INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
|
| 2470 | GFP_KERNEL);
|
| 2471 | }
|
| 2472 | EXPORT_SYMBOL(input_get_new_minor);
|
| 2473 |
|
| 2474 | |
| 2475 | * input_free_minor - release previously allocated minor
|
| 2476 | * @minor: minor to be released
|
| 2477 | *
|
| 2478 | * This function releases previously allocated input minor so that it can be
|
| 2479 | * reused later.
|
| 2480 |
|
| 2481 | void input_free_minor(unsigned int minor)
|
| 2482 | {
|
| 2483 | ida_simple_remove(&input_ida, minor);
|
| 2484 | }
|
| 2485 | EXPORT_SYMBOL(input_free_minor);
|
| 2486 |
|
| 2487 | static int __init input_init(void)
|
| 2488 | {
|
| 2489 | int err;
|
| 2490 |
|
| 2491 | err = class_register(&input_class);
|
| 2492 | if (err) {
|
| 2493 | pr_err("unable to register input_dev class\n");
|
| 2494 | return err;
|
| 2495 | }
|
| 2496 |
|
| 2497 | err = input_proc_init();
|
| 2498 | if (err)
|
| 2499 | goto fail1;
|
| 2500 |
|
| 2501 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
|
| 2502 | INPUT_MAX_CHAR_DEVICES, "input");
|
| 2503 | if (err) {
|
| 2504 | pr_err("unable to register char major %d", INPUT_MAJOR);
|
| 2505 | goto fail2;
|
| 2506 | }
|
| 2507 |
|
| 2508 | return 0;
|
| 2509 |
|
| 2510 | fail2: input_proc_exit();
|
| 2511 | fail1: class_unregister(&input_class);
|
| 2512 | return err;
|
| 2513 | }
|
| 2514 |
|
| 2515 | static void __exit input_exit(void)
|
| 2516 | {
|
| 2517 | input_proc_exit();
|
| 2518 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
|
| 2519 | INPUT_MAX_CHAR_DEVICES);
|
| 2520 | class_unregister(&input_class);
|
| 2521 | }
|
| 2522 |
|
| 2523 | subsys_initcall(input_init);
|
| 2524 | module_exit(input_exit);
|