| 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/export.h>
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| 12 | #include <linux/init.h>
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| 13 | #include <linux/types.h>
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| 14 | #include <linux/idr.h>
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| 15 | #include <linux/input/mt.h>
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| 16 | #include <linux/module.h>
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| 17 | #include <linux/slab.h>
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| 18 | #include <linux/random.h>
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| 19 | #include <linux/major.h>
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| 20 | #include <linux/proc_fs.h>
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| 21 | #include <linux/sched.h>
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| 22 | #include <linux/seq_file.h>
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| 23 | #include <linux/pm.h>
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| 24 | #include <linux/poll.h>
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| 25 | #include <linux/device.h>
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| 26 | #include <linux/kstrtox.h>
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| 27 | #include <linux/mutex.h>
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| 28 | #include <linux/rcupdate.h>
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| 29 | #include "input-compat.h"
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| 30 | #include "input-core-private.h"
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| 31 | #include "input-poller.h"
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| 32 |
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| 33 | MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
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| 34 | MODULE_DESCRIPTION("Input core");
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| 35 | MODULE_LICENSE("GPL");
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| 36 |
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| 37 | #define INPUT_MAX_CHAR_DEVICES 1024
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| 38 | #define INPUT_FIRST_DYNAMIC_DEV 256
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| 39 | static DEFINE_IDA(input_ida);
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| 40 |
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| 41 | static LIST_HEAD(input_dev_list);
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| 42 | static LIST_HEAD(input_handler_list);
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| 43 |
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| 44 | |
| 45 | * input_mutex protects access to both input_dev_list and input_handler_list.
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| 46 | * This also causes input_[un]register_device and input_[un]register_handler
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| 47 | * be mutually exclusive which simplifies locking in drivers implementing
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| 48 | * input handlers.
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| 49 |
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| 50 | static DEFINE_MUTEX(input_mutex);
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| 51 |
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| 52 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
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| 53 |
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| 54 | static const unsigned int input_max_code[EV_CNT] = {
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| 55 | [EV_KEY] = KEY_MAX,
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| 56 | [EV_REL] = REL_MAX,
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| 57 | [EV_ABS] = ABS_MAX,
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| 58 | [EV_MSC] = MSC_MAX,
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| 59 | [EV_SW] = SW_MAX,
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| 60 | [EV_LED] = LED_MAX,
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| 61 | [EV_SND] = SND_MAX,
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| 62 | [EV_FF] = FF_MAX,
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| 63 | };
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| 64 |
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| 65 | static inline int is_event_supported(unsigned int code,
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| 66 | unsigned long *bm, unsigned int max)
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| 67 | {
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| 68 | return code <= max && test_bit(code, bm);
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| 69 | }
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| 70 |
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| 71 | static int input_defuzz_abs_event(int value, int old_val, int fuzz)
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| 72 | {
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| 73 | if (fuzz) {
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| 74 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
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| 75 | return old_val;
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| 76 |
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| 77 | if (value > old_val - fuzz && value < old_val + fuzz)
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| 78 | return (old_val * 3 + value) / 4;
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| 79 |
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| 80 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
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| 81 | return (old_val + value) / 2;
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| 82 | }
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| 83 |
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| 84 | return value;
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| 85 | }
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| 86 |
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| 87 | static void input_start_autorepeat(struct input_dev *dev, int code)
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| 88 | {
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| 89 | if (test_bit(EV_REP, dev->evbit) &&
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| 90 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
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| 91 | dev->timer.function) {
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| 92 | dev->repeat_key = code;
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| 93 | mod_timer(&dev->timer,
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| 94 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | static void input_stop_autorepeat(struct input_dev *dev)
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| 99 | {
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| 100 | timer_delete(&dev->timer);
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| 101 | }
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| 102 |
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| 103 | |
| 104 | * Pass values first through all filters and then, if event has not been
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| 105 | * filtered out, through all open handles. This order is achieved by placing
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| 106 | * filters at the head of the list of handles attached to the device, and
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| 107 | * placing regular handles at the tail of the list.
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| 108 | *
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| 109 | * This function is called with dev->event_lock held and interrupts disabled.
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| 110 |
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| 111 | static void input_pass_values(struct input_dev *dev,
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| 112 | struct input_value *vals, unsigned int count)
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| 113 | {
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| 114 | struct input_handle *handle;
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| 115 | struct input_value *v;
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| 116 |
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| 117 | lockdep_assert_held(&dev->event_lock);
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| 118 |
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| 119 | scoped_guard(rcu) {
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| 120 | handle = rcu_dereference(dev->grab);
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| 121 | if (handle) {
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| 122 | count = handle->handle_events(handle, vals, count);
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| 123 | break;
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| 124 | }
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| 125 |
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| 126 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
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| 127 | if (handle->open) {
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| 128 | count = handle->handle_events(handle, vals,
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| 129 | count);
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| 130 | if (!count)
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| 131 | break;
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| 132 | }
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| 133 | }
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| 134 | }
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| 135 |
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| 136 |
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| 137 | if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
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| 138 | for (v = vals; v != vals + count; v++) {
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| 139 | if (v->type == EV_KEY && v->value != 2) {
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| 140 | if (v->value)
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| 141 | input_start_autorepeat(dev, v->code);
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| 142 | else
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| 143 | input_stop_autorepeat(dev);
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| 144 | }
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| 145 | }
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| 146 | }
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| 147 | }
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| 148 |
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| 149 | #define INPUT_IGNORE_EVENT 0
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| 150 | #define INPUT_PASS_TO_HANDLERS 1
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| 151 | #define INPUT_PASS_TO_DEVICE 2
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| 152 | #define INPUT_SLOT 4
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| 153 | #define INPUT_FLUSH 8
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| 154 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
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| 155 |
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| 156 | static int input_handle_abs_event(struct input_dev *dev,
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| 157 | unsigned int code, int *pval)
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| 158 | {
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| 159 | struct input_mt *mt = dev->mt;
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| 160 | bool is_new_slot = false;
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| 161 | bool is_mt_event;
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| 162 | int *pold;
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| 163 |
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| 164 | if (code == ABS_MT_SLOT) {
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| 165 | |
| 166 | * "Stage" the event; we'll flush it later, when we
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| 167 | * get actual touch data.
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| 168 |
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| 169 | if (mt && *pval >= 0 && *pval < mt->num_slots)
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| 170 | mt->slot = *pval;
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| 171 |
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| 172 | return INPUT_IGNORE_EVENT;
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| 173 | }
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| 174 |
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| 175 | is_mt_event = input_is_mt_value(code);
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| 176 |
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| 177 | if (!is_mt_event) {
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| 178 | pold = &dev->absinfo[code].value;
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| 179 | } else if (mt) {
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| 180 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
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| 181 | is_new_slot = mt->slot != dev->absinfo[ABS_MT_SLOT].value;
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| 182 | } else {
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| 183 | |
| 184 | * Bypass filtering for multi-touch events when
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| 185 | * not employing slots.
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| 186 |
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| 187 | pold = NULL;
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| 188 | }
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| 189 |
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| 190 | if (pold) {
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| 191 | *pval = input_defuzz_abs_event(*pval, *pold,
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| 192 | dev->absinfo[code].fuzz);
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| 193 | if (*pold == *pval)
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| 194 | return INPUT_IGNORE_EVENT;
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| 195 |
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| 196 | *pold = *pval;
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| 197 | }
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| 198 |
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| 199 |
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| 200 | if (is_new_slot) {
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| 201 | dev->absinfo[ABS_MT_SLOT].value = mt->slot;
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| 202 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
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| 203 | }
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| 204 |
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| 205 | return INPUT_PASS_TO_HANDLERS;
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| 206 | }
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| 207 |
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| 208 | static int input_get_disposition(struct input_dev *dev,
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| 209 | unsigned int type, unsigned int code, int *pval)
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| 210 | {
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| 211 | int disposition = INPUT_IGNORE_EVENT;
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| 212 | int value = *pval;
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| 213 |
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| 214 |
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| 215 | if (dev->inhibited)
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| 216 | return INPUT_IGNORE_EVENT;
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| 217 |
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| 218 | switch (type) {
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| 219 |
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| 220 | case EV_SYN:
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| 221 | switch (code) {
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| 222 | case SYN_CONFIG:
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| 223 | disposition = INPUT_PASS_TO_ALL;
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| 224 | break;
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| 225 |
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| 226 | case SYN_REPORT:
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| 227 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
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| 228 | break;
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| 229 | case SYN_MT_REPORT:
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| 230 | disposition = INPUT_PASS_TO_HANDLERS;
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| 231 | break;
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| 232 | }
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| 233 | break;
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| 234 |
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| 235 | case EV_KEY:
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| 236 | if (is_event_supported(code, dev->keybit, KEY_MAX)) {
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| 237 |
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| 238 |
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| 239 | if (value == 2) {
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| 240 | disposition = INPUT_PASS_TO_HANDLERS;
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| 241 | break;
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| 242 | }
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| 243 |
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| 244 | if (!!test_bit(code, dev->key) != !!value) {
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| 245 |
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| 246 | __change_bit(code, dev->key);
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| 247 | disposition = INPUT_PASS_TO_HANDLERS;
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| 248 | }
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| 249 | }
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| 250 | break;
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| 251 |
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| 252 | case EV_SW:
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| 253 | if (is_event_supported(code, dev->swbit, SW_MAX) &&
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| 254 | !!test_bit(code, dev->sw) != !!value) {
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| 255 |
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| 256 | __change_bit(code, dev->sw);
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| 257 | disposition = INPUT_PASS_TO_HANDLERS;
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| 258 | }
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| 259 | break;
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| 260 |
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| 261 | case EV_ABS:
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| 262 | if (is_event_supported(code, dev->absbit, ABS_MAX))
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| 263 | disposition = input_handle_abs_event(dev, code, &value);
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| 264 |
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| 265 | break;
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| 266 |
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| 267 | case EV_REL:
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| 268 | if (is_event_supported(code, dev->relbit, REL_MAX) && value)
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| 269 | disposition = INPUT_PASS_TO_HANDLERS;
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| 270 |
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| 271 | break;
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| 272 |
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| 273 | case EV_MSC:
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| 274 | if (is_event_supported(code, dev->mscbit, MSC_MAX))
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| 275 | disposition = INPUT_PASS_TO_ALL;
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| 276 |
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| 277 | break;
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| 278 |
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| 279 | case EV_LED:
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| 280 | if (is_event_supported(code, dev->ledbit, LED_MAX) &&
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| 281 | !!test_bit(code, dev->led) != !!value) {
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| 282 |
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| 283 | __change_bit(code, dev->led);
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| 284 | disposition = INPUT_PASS_TO_ALL;
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| 285 | }
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| 286 | break;
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| 287 |
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| 288 | case EV_SND:
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| 289 | if (is_event_supported(code, dev->sndbit, SND_MAX)) {
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| 290 |
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| 291 | if (!!test_bit(code, dev->snd) != !!value)
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| 292 | __change_bit(code, dev->snd);
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| 293 | disposition = INPUT_PASS_TO_ALL;
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| 294 | }
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| 295 | break;
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| 296 |
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| 297 | case EV_REP:
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| 298 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
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| 299 | dev->rep[code] = value;
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| 300 | disposition = INPUT_PASS_TO_ALL;
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| 301 | }
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| 302 | break;
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| 303 |
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| 304 | case EV_FF:
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| 305 | if (value >= 0)
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| 306 | disposition = INPUT_PASS_TO_ALL;
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| 307 | break;
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| 308 |
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| 309 | case EV_PWR:
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| 310 | disposition = INPUT_PASS_TO_ALL;
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| 311 | break;
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| 312 | }
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| 313 |
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| 314 | *pval = value;
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| 315 | return disposition;
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| 316 | }
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| 317 |
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| 318 | static void input_event_dispose(struct input_dev *dev, int disposition,
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| 319 | unsigned int type, unsigned int code, int value)
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| 320 | {
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| 321 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
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| 322 | dev->event(dev, type, code, value);
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| 323 |
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| 324 | if (disposition & INPUT_PASS_TO_HANDLERS) {
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| 325 | struct input_value *v;
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| 326 |
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| 327 | if (disposition & INPUT_SLOT) {
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| 328 | v = &dev->vals[dev->num_vals++];
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| 329 | v->type = EV_ABS;
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| 330 | v->code = ABS_MT_SLOT;
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| 331 | v->value = dev->mt->slot;
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| 332 | }
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| 333 |
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| 334 | v = &dev->vals[dev->num_vals++];
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| 335 | v->type = type;
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| 336 | v->code = code;
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| 337 | v->value = value;
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| 338 | }
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| 339 |
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| 340 | if (disposition & INPUT_FLUSH) {
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| 341 | if (dev->num_vals >= 2)
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| 342 | input_pass_values(dev, dev->vals, dev->num_vals);
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| 343 | dev->num_vals = 0;
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| 344 | |
| 345 | * Reset the timestamp on flush so we won't end up
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| 346 | * with a stale one. Note we only need to reset the
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| 347 | * monolithic one as we use its presence when deciding
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| 348 | * whether to generate a synthetic timestamp.
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| 349 |
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| 350 | dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0);
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| 351 | } else if (dev->num_vals >= dev->max_vals - 2) {
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| 352 | dev->vals[dev->num_vals++] = input_value_sync;
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| 353 | input_pass_values(dev, dev->vals, dev->num_vals);
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| 354 | dev->num_vals = 0;
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| 355 | }
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| 356 | }
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| 357 |
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| 358 | void input_handle_event(struct input_dev *dev,
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| 359 | unsigned int type, unsigned int code, int value)
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| 360 | {
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| 361 | int disposition;
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| 362 |
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| 363 | lockdep_assert_held(&dev->event_lock);
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| 364 |
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| 365 | disposition = input_get_disposition(dev, type, code, &value);
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| 366 | if (disposition != INPUT_IGNORE_EVENT) {
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| 367 | if (type != EV_SYN)
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| 368 | add_input_randomness(type, code, value);
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| 369 |
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| 370 | input_event_dispose(dev, disposition, type, code, value);
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| 371 | }
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| 372 | }
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| 373 |
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| 374 | |
| 375 | * input_event() - report new input event
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| 376 | * @dev: device that generated the event
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| 377 | * @type: type of the event
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| 378 | * @code: event code
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| 379 | * @value: value of the event
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| 380 | *
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| 381 | * This function should be used by drivers implementing various input
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| 382 | * devices to report input events. See also input_inject_event().
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| 383 | *
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| 384 | * NOTE: input_event() may be safely used right after input device was
|
| 385 | * allocated with input_allocate_device(), even before it is registered
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| 386 | * with input_register_device(), but the event will not reach any of the
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| 387 | * input handlers. Such early invocation of input_event() may be used
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| 388 | * to 'seed' initial state of a switch or initial position of absolute
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| 389 | * axis, etc.
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| 390 |
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| 391 | void input_event(struct input_dev *dev,
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| 392 | unsigned int type, unsigned int code, int value)
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| 393 | {
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| 394 | if (is_event_supported(type, dev->evbit, EV_MAX)) {
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| 395 | guard(spinlock_irqsave)(&dev->event_lock);
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| 396 | input_handle_event(dev, type, code, value);
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| 397 | }
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| 398 | }
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| 399 | EXPORT_SYMBOL(input_event);
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| 400 |
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| 401 | |
| 402 | * input_inject_event() - send input event from input handler
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| 403 | * @handle: input handle to send event through
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| 404 | * @type: type of the event
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| 405 | * @code: event code
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| 406 | * @value: value of the event
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| 407 | *
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| 408 | * Similar to input_event() but will ignore event if device is
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| 409 | * "grabbed" and handle injecting event is not the one that owns
|
| 410 | * the device.
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| 411 |
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| 412 | void input_inject_event(struct input_handle *handle,
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| 413 | unsigned int type, unsigned int code, int value)
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| 414 | {
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| 415 | struct input_dev *dev = handle->dev;
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| 416 | struct input_handle *grab;
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| 417 |
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| 418 | if (is_event_supported(type, dev->evbit, EV_MAX)) {
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| 419 | guard(spinlock_irqsave)(&dev->event_lock);
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| 420 | guard(rcu)();
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| 421 |
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| 422 | grab = rcu_dereference(dev->grab);
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| 423 | if (!grab || grab == handle)
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| 424 | input_handle_event(dev, type, code, value);
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| 425 |
|
| 426 | }
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| 427 | }
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| 428 | EXPORT_SYMBOL(input_inject_event);
|
| 429 |
|
| 430 | |
| 431 | * input_alloc_absinfo - allocates array of input_absinfo structs
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| 432 | * @dev: the input device emitting absolute events
|
| 433 | *
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| 434 | * If the absinfo struct the caller asked for is already allocated, this
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| 435 | * functions will not do anything.
|
| 436 |
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| 437 | void input_alloc_absinfo(struct input_dev *dev)
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| 438 | {
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| 439 | if (dev->absinfo)
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| 440 | return;
|
| 441 |
|
| 442 | dev->absinfo = kzalloc_objs(*dev->absinfo, ABS_CNT);
|
| 443 | if (!dev->absinfo) {
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| 444 | dev_err(dev->dev.parent ?: &dev->dev,
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| 445 | "%s: unable to allocate memory\n", __func__);
|
| 446 | |
| 447 | * We will handle this allocation failure in
|
| 448 | * input_register_device() when we refuse to register input
|
| 449 | * device with ABS bits but without absinfo.
|
| 450 |
|
| 451 | }
|
| 452 | }
|
| 453 | EXPORT_SYMBOL(input_alloc_absinfo);
|
| 454 |
|
| 455 | void input_set_abs_params(struct input_dev *dev, unsigned int axis,
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| 456 | int min, int max, int fuzz, int flat)
|
| 457 | {
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| 458 | struct input_absinfo *absinfo;
|
| 459 |
|
| 460 | __set_bit(EV_ABS, dev->evbit);
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| 461 | __set_bit(axis, dev->absbit);
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| 462 |
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| 463 | input_alloc_absinfo(dev);
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| 464 | if (!dev->absinfo)
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| 465 | return;
|
| 466 |
|
| 467 | absinfo = &dev->absinfo[axis];
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| 468 | absinfo->minimum = min;
|
| 469 | absinfo->maximum = max;
|
| 470 | absinfo->fuzz = fuzz;
|
| 471 | absinfo->flat = flat;
|
| 472 | }
|
| 473 | EXPORT_SYMBOL(input_set_abs_params);
|
| 474 |
|
| 475 | |
| 476 | * input_copy_abs - Copy absinfo from one input_dev to another
|
| 477 | * @dst: Destination input device to copy the abs settings to
|
| 478 | * @dst_axis: ABS_* value selecting the destination axis
|
| 479 | * @src: Source input device to copy the abs settings from
|
| 480 | * @src_axis: ABS_* value selecting the source axis
|
| 481 | *
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| 482 | * Set absinfo for the selected destination axis by copying it from
|
| 483 | * the specified source input device's source axis.
|
| 484 | * This is useful to e.g. setup a pen/stylus input-device for combined
|
| 485 | * touchscreen/pen hardware where the pen uses the same coordinates as
|
| 486 | * the touchscreen.
|
| 487 |
|
| 488 | void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
|
| 489 | const struct input_dev *src, unsigned int src_axis)
|
| 490 | {
|
| 491 |
|
| 492 | if (WARN_ON(!(test_bit(EV_ABS, src->evbit) &&
|
| 493 | test_bit(src_axis, src->absbit))))
|
| 494 | return;
|
| 495 |
|
| 496 | |
| 497 | * input_alloc_absinfo() may have failed for the source. Our caller is
|
| 498 | * expected to catch this when registering the input devices, which may
|
| 499 | * happen after the input_copy_abs() call.
|
| 500 |
|
| 501 | if (!src->absinfo)
|
| 502 | return;
|
| 503 |
|
| 504 | input_set_capability(dst, EV_ABS, dst_axis);
|
| 505 | if (!dst->absinfo)
|
| 506 | return;
|
| 507 |
|
| 508 | dst->absinfo[dst_axis] = src->absinfo[src_axis];
|
| 509 | }
|
| 510 | EXPORT_SYMBOL(input_copy_abs);
|
| 511 |
|
| 512 | |
| 513 | * input_grab_device - grabs device for exclusive use
|
| 514 | * @handle: input handle that wants to own the device
|
| 515 | *
|
| 516 | * When a device is grabbed by an input handle all events generated by
|
| 517 | * the device are delivered only to this handle. Also events injected
|
| 518 | * by other input handles are ignored while device is grabbed.
|
| 519 |
|
| 520 | int input_grab_device(struct input_handle *handle)
|
| 521 | {
|
| 522 | struct input_dev *dev = handle->dev;
|
| 523 |
|
| 524 | scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {
|
| 525 | if (dev->grab)
|
| 526 | return -EBUSY;
|
| 527 |
|
| 528 | rcu_assign_pointer(dev->grab, handle);
|
| 529 | }
|
| 530 |
|
| 531 | return 0;
|
| 532 | }
|
| 533 | EXPORT_SYMBOL(input_grab_device);
|
| 534 |
|
| 535 | static void __input_release_device(struct input_handle *handle)
|
| 536 | {
|
| 537 | struct input_dev *dev = handle->dev;
|
| 538 | struct input_handle *grabber;
|
| 539 |
|
| 540 | grabber = rcu_dereference_protected(dev->grab,
|
| 541 | lockdep_is_held(&dev->mutex));
|
| 542 | if (grabber == handle) {
|
| 543 | rcu_assign_pointer(dev->grab, NULL);
|
| 544 |
|
| 545 | synchronize_rcu();
|
| 546 |
|
| 547 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 548 | if (handle->open && handle->handler->start)
|
| 549 | handle->handler->start(handle);
|
| 550 | }
|
| 551 | }
|
| 552 |
|
| 553 | |
| 554 | * input_release_device - release previously grabbed device
|
| 555 | * @handle: input handle that owns the device
|
| 556 | *
|
| 557 | * Releases previously grabbed device so that other input handles can
|
| 558 | * start receiving input events. Upon release all handlers attached
|
| 559 | * to the device have their start() method called so they have a change
|
| 560 | * to synchronize device state with the rest of the system.
|
| 561 |
|
| 562 | void input_release_device(struct input_handle *handle)
|
| 563 | {
|
| 564 | struct input_dev *dev = handle->dev;
|
| 565 |
|
| 566 | guard(mutex)(&dev->mutex);
|
| 567 | __input_release_device(handle);
|
| 568 | }
|
| 569 | EXPORT_SYMBOL(input_release_device);
|
| 570 |
|
| 571 | |
| 572 | * input_open_device - open input device
|
| 573 | * @handle: handle through which device is being accessed
|
| 574 | *
|
| 575 | * This function should be called by input handlers when they
|
| 576 | * want to start receive events from given input device.
|
| 577 |
|
| 578 | int input_open_device(struct input_handle *handle)
|
| 579 | {
|
| 580 | struct input_dev *dev = handle->dev;
|
| 581 | int error;
|
| 582 |
|
| 583 | scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {
|
| 584 | if (dev->going_away)
|
| 585 | return -ENODEV;
|
| 586 |
|
| 587 | handle->open++;
|
| 588 |
|
| 589 | if (handle->handler->passive_observer)
|
| 590 | return 0;
|
| 591 |
|
| 592 | if (dev->users++ || dev->inhibited) {
|
| 593 | |
| 594 | * Device is already opened and/or inhibited,
|
| 595 | * so we can exit immediately and report success.
|
| 596 |
|
| 597 | return 0;
|
| 598 | }
|
| 599 |
|
| 600 | if (dev->open) {
|
| 601 | error = dev->open(dev);
|
| 602 | if (error) {
|
| 603 | dev->users--;
|
| 604 | handle->open--;
|
| 605 | |
| 606 | * Make sure we are not delivering any more
|
| 607 | * events through this handle.
|
| 608 |
|
| 609 | synchronize_rcu();
|
| 610 | return error;
|
| 611 | }
|
| 612 | }
|
| 613 |
|
| 614 | if (dev->poller)
|
| 615 | input_dev_poller_start(dev->poller);
|
| 616 | }
|
| 617 |
|
| 618 | return 0;
|
| 619 | }
|
| 620 | EXPORT_SYMBOL(input_open_device);
|
| 621 |
|
| 622 | int input_flush_device(struct input_handle *handle, struct file *file)
|
| 623 | {
|
| 624 | struct input_dev *dev = handle->dev;
|
| 625 |
|
| 626 | scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {
|
| 627 | if (dev->flush)
|
| 628 | return dev->flush(dev, file);
|
| 629 | }
|
| 630 |
|
| 631 | return 0;
|
| 632 | }
|
| 633 | EXPORT_SYMBOL(input_flush_device);
|
| 634 |
|
| 635 | |
| 636 | * input_close_device - close input device
|
| 637 | * @handle: handle through which device is being accessed
|
| 638 | *
|
| 639 | * This function should be called by input handlers when they
|
| 640 | * want to stop receive events from given input device.
|
| 641 |
|
| 642 | void input_close_device(struct input_handle *handle)
|
| 643 | {
|
| 644 | struct input_dev *dev = handle->dev;
|
| 645 |
|
| 646 | guard(mutex)(&dev->mutex);
|
| 647 |
|
| 648 | __input_release_device(handle);
|
| 649 |
|
| 650 | if (!handle->handler->passive_observer) {
|
| 651 | if (!--dev->users && !dev->inhibited) {
|
| 652 | if (dev->poller)
|
| 653 | input_dev_poller_stop(dev->poller);
|
| 654 | if (dev->close)
|
| 655 | dev->close(dev);
|
| 656 | }
|
| 657 | }
|
| 658 |
|
| 659 | if (!--handle->open) {
|
| 660 | |
| 661 | * synchronize_rcu() makes sure that input_pass_values()
|
| 662 | * completed and that no more input events are delivered
|
| 663 | * through this handle
|
| 664 |
|
| 665 | synchronize_rcu();
|
| 666 | }
|
| 667 | }
|
| 668 | EXPORT_SYMBOL(input_close_device);
|
| 669 |
|
| 670 | |
| 671 | * Simulate keyup events for all keys that are marked as pressed.
|
| 672 | * The function must be called with dev->event_lock held.
|
| 673 |
|
| 674 | static bool input_dev_release_keys(struct input_dev *dev)
|
| 675 | {
|
| 676 | bool need_sync = false;
|
| 677 | int code;
|
| 678 |
|
| 679 | lockdep_assert_held(&dev->event_lock);
|
| 680 |
|
| 681 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
|
| 682 | for_each_set_bit(code, dev->key, KEY_CNT) {
|
| 683 | input_handle_event(dev, EV_KEY, code, 0);
|
| 684 | need_sync = true;
|
| 685 | }
|
| 686 | }
|
| 687 |
|
| 688 | return need_sync;
|
| 689 | }
|
| 690 |
|
| 691 | |
| 692 | * Prepare device for unregistering
|
| 693 |
|
| 694 | static void input_disconnect_device(struct input_dev *dev)
|
| 695 | {
|
| 696 | struct input_handle *handle;
|
| 697 |
|
| 698 | |
| 699 | * Mark device as going away. Note that we take dev->mutex here
|
| 700 | * not to protect access to dev->going_away but rather to ensure
|
| 701 | * that there are no threads in the middle of input_open_device()
|
| 702 |
|
| 703 | scoped_guard(mutex, &dev->mutex)
|
| 704 | dev->going_away = true;
|
| 705 |
|
| 706 | guard(spinlock_irq)(&dev->event_lock);
|
| 707 |
|
| 708 | |
| 709 | * Simulate keyup events for all pressed keys so that handlers
|
| 710 | * are not left with "stuck" keys. The driver may continue
|
| 711 | * generate events even after we done here but they will not
|
| 712 | * reach any handlers.
|
| 713 |
|
| 714 | if (input_dev_release_keys(dev))
|
| 715 | input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
|
| 716 |
|
| 717 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 718 | handle->open = 0;
|
| 719 | }
|
| 720 |
|
| 721 | |
| 722 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
|
| 723 | * @ke: keymap entry containing scancode to be converted.
|
| 724 | * @scancode: pointer to the location where converted scancode should
|
| 725 | * be stored.
|
| 726 | *
|
| 727 | * This function is used to convert scancode stored in &struct keymap_entry
|
| 728 | * into scalar form understood by legacy keymap handling methods. These
|
| 729 | * methods expect scancodes to be represented as 'unsigned int'.
|
| 730 |
|
| 731 | int input_scancode_to_scalar(const struct input_keymap_entry *ke,
|
| 732 | unsigned int *scancode)
|
| 733 | {
|
| 734 | switch (ke->len) {
|
| 735 | case 1:
|
| 736 | *scancode = *((u8 *)ke->scancode);
|
| 737 | break;
|
| 738 |
|
| 739 | case 2:
|
| 740 | *scancode = *((u16 *)ke->scancode);
|
| 741 | break;
|
| 742 |
|
| 743 | case 4:
|
| 744 | *scancode = *((u32 *)ke->scancode);
|
| 745 | break;
|
| 746 |
|
| 747 | default:
|
| 748 | return -EINVAL;
|
| 749 | }
|
| 750 |
|
| 751 | return 0;
|
| 752 | }
|
| 753 | EXPORT_SYMBOL(input_scancode_to_scalar);
|
| 754 |
|
| 755 | |
| 756 | * Those routines handle the default case where no [gs]etkeycode() is
|
| 757 | * defined. In this case, an array indexed by the scancode is used.
|
| 758 |
|
| 759 |
|
| 760 | static unsigned int input_fetch_keycode(struct input_dev *dev,
|
| 761 | unsigned int index)
|
| 762 | {
|
| 763 | switch (dev->keycodesize) {
|
| 764 | case 1:
|
| 765 | return ((u8 *)dev->keycode)[index];
|
| 766 |
|
| 767 | case 2:
|
| 768 | return ((u16 *)dev->keycode)[index];
|
| 769 |
|
| 770 | default:
|
| 771 | return ((u32 *)dev->keycode)[index];
|
| 772 | }
|
| 773 | }
|
| 774 |
|
| 775 | static int input_default_getkeycode(struct input_dev *dev,
|
| 776 | struct input_keymap_entry *ke)
|
| 777 | {
|
| 778 | unsigned int index;
|
| 779 | int error;
|
| 780 |
|
| 781 | if (!dev->keycodesize)
|
| 782 | return -EINVAL;
|
| 783 |
|
| 784 | if (ke->flags & INPUT_KEYMAP_BY_INDEX)
|
| 785 | index = ke->index;
|
| 786 | else {
|
| 787 | error = input_scancode_to_scalar(ke, &index);
|
| 788 | if (error)
|
| 789 | return error;
|
| 790 | }
|
| 791 |
|
| 792 | if (index >= dev->keycodemax)
|
| 793 | return -EINVAL;
|
| 794 |
|
| 795 | ke->keycode = input_fetch_keycode(dev, index);
|
| 796 | ke->index = index;
|
| 797 | ke->len = sizeof(index);
|
| 798 | memcpy(ke->scancode, &index, sizeof(index));
|
| 799 |
|
| 800 | return 0;
|
| 801 | }
|
| 802 |
|
| 803 | static int input_default_setkeycode(struct input_dev *dev,
|
| 804 | const struct input_keymap_entry *ke,
|
| 805 | unsigned int *old_keycode)
|
| 806 | {
|
| 807 | unsigned int index;
|
| 808 | int error;
|
| 809 | int i;
|
| 810 |
|
| 811 | if (!dev->keycodesize)
|
| 812 | return -EINVAL;
|
| 813 |
|
| 814 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
|
| 815 | index = ke->index;
|
| 816 | } else {
|
| 817 | error = input_scancode_to_scalar(ke, &index);
|
| 818 | if (error)
|
| 819 | return error;
|
| 820 | }
|
| 821 |
|
| 822 | if (index >= dev->keycodemax)
|
| 823 | return -EINVAL;
|
| 824 |
|
| 825 | if (dev->keycodesize < sizeof(ke->keycode) &&
|
| 826 | (ke->keycode >> (dev->keycodesize * 8)))
|
| 827 | return -EINVAL;
|
| 828 |
|
| 829 | switch (dev->keycodesize) {
|
| 830 | case 1: {
|
| 831 | u8 *k = (u8 *)dev->keycode;
|
| 832 | *old_keycode = k[index];
|
| 833 | k[index] = ke->keycode;
|
| 834 | break;
|
| 835 | }
|
| 836 | case 2: {
|
| 837 | u16 *k = (u16 *)dev->keycode;
|
| 838 | *old_keycode = k[index];
|
| 839 | k[index] = ke->keycode;
|
| 840 | break;
|
| 841 | }
|
| 842 | default: {
|
| 843 | u32 *k = (u32 *)dev->keycode;
|
| 844 | *old_keycode = k[index];
|
| 845 | k[index] = ke->keycode;
|
| 846 | break;
|
| 847 | }
|
| 848 | }
|
| 849 |
|
| 850 | if (*old_keycode <= KEY_MAX) {
|
| 851 | __clear_bit(*old_keycode, dev->keybit);
|
| 852 | for (i = 0; i < dev->keycodemax; i++) {
|
| 853 | if (input_fetch_keycode(dev, i) == *old_keycode) {
|
| 854 | __set_bit(*old_keycode, dev->keybit);
|
| 855 |
|
| 856 | break;
|
| 857 | }
|
| 858 | }
|
| 859 | }
|
| 860 |
|
| 861 | __set_bit(ke->keycode, dev->keybit);
|
| 862 | return 0;
|
| 863 | }
|
| 864 |
|
| 865 | |
| 866 | * input_get_keycode - retrieve keycode currently mapped to a given scancode
|
| 867 | * @dev: input device which keymap is being queried
|
| 868 | * @ke: keymap entry
|
| 869 | *
|
| 870 | * This function should be called by anyone interested in retrieving current
|
| 871 | * keymap. Presently evdev handlers use it.
|
| 872 |
|
| 873 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
|
| 874 | {
|
| 875 | guard(spinlock_irqsave)(&dev->event_lock);
|
| 876 |
|
| 877 | return dev->getkeycode(dev, ke);
|
| 878 | }
|
| 879 | EXPORT_SYMBOL(input_get_keycode);
|
| 880 |
|
| 881 | |
| 882 | * input_set_keycode - attribute a keycode to a given scancode
|
| 883 | * @dev: input device which keymap is being updated
|
| 884 | * @ke: new keymap entry
|
| 885 | *
|
| 886 | * This function should be called by anyone needing to update current
|
| 887 | * keymap. Presently keyboard and evdev handlers use it.
|
| 888 |
|
| 889 | int input_set_keycode(struct input_dev *dev,
|
| 890 | const struct input_keymap_entry *ke)
|
| 891 | {
|
| 892 | unsigned int old_keycode;
|
| 893 | int error;
|
| 894 |
|
| 895 | if (ke->keycode > KEY_MAX)
|
| 896 | return -EINVAL;
|
| 897 |
|
| 898 | guard(spinlock_irqsave)(&dev->event_lock);
|
| 899 |
|
| 900 | error = dev->setkeycode(dev, ke, &old_keycode);
|
| 901 | if (error)
|
| 902 | return error;
|
| 903 |
|
| 904 |
|
| 905 | __clear_bit(KEY_RESERVED, dev->keybit);
|
| 906 |
|
| 907 | |
| 908 | * Simulate keyup event if keycode is not present
|
| 909 | * in the keymap anymore
|
| 910 |
|
| 911 | if (old_keycode > KEY_MAX) {
|
| 912 | dev_warn(dev->dev.parent ?: &dev->dev,
|
| 913 | "%s: got too big old keycode %#x\n",
|
| 914 | __func__, old_keycode);
|
| 915 | } else if (test_bit(EV_KEY, dev->evbit) &&
|
| 916 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
|
| 917 | __test_and_clear_bit(old_keycode, dev->key)) {
|
| 918 | |
| 919 | * We have to use input_event_dispose() here directly instead
|
| 920 | * of input_handle_event() because the key we want to release
|
| 921 | * here is considered no longer supported by the device and
|
| 922 | * input_handle_event() will ignore it.
|
| 923 |
|
| 924 | input_event_dispose(dev, INPUT_PASS_TO_HANDLERS,
|
| 925 | EV_KEY, old_keycode, 0);
|
| 926 | input_event_dispose(dev, INPUT_PASS_TO_HANDLERS | INPUT_FLUSH,
|
| 927 | EV_SYN, SYN_REPORT, 1);
|
| 928 | }
|
| 929 |
|
| 930 | return 0;
|
| 931 | }
|
| 932 | EXPORT_SYMBOL(input_set_keycode);
|
| 933 |
|
| 934 | bool input_match_device_id(const struct input_dev *dev,
|
| 935 | const struct input_device_id *id)
|
| 936 | {
|
| 937 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
|
| 938 | if (id->bustype != dev->id.bustype)
|
| 939 | return false;
|
| 940 |
|
| 941 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
|
| 942 | if (id->vendor != dev->id.vendor)
|
| 943 | return false;
|
| 944 |
|
| 945 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
|
| 946 | if (id->product != dev->id.product)
|
| 947 | return false;
|
| 948 |
|
| 949 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
|
| 950 | if (id->version != dev->id.version)
|
| 951 | return false;
|
| 952 |
|
| 953 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
|
| 954 | !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
|
| 955 | !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
|
| 956 | !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
|
| 957 | !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
|
| 958 | !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
|
| 959 | !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
|
| 960 | !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
|
| 961 | !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||
|
| 962 | !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {
|
| 963 | return false;
|
| 964 | }
|
| 965 |
|
| 966 | return true;
|
| 967 | }
|
| 968 | EXPORT_SYMBOL(input_match_device_id);
|
| 969 |
|
| 970 | static const struct input_device_id *input_match_device(struct input_handler *handler,
|
| 971 | struct input_dev *dev)
|
| 972 | {
|
| 973 | const struct input_device_id *id;
|
| 974 |
|
| 975 | for (id = handler->id_table; id->flags; id++) {
|
| 976 | if (input_match_device_id(dev, id) &&
|
| 977 | (!handler->match || handler->match(handler, dev))) {
|
| 978 | return id;
|
| 979 | }
|
| 980 | }
|
| 981 |
|
| 982 | return NULL;
|
| 983 | }
|
| 984 |
|
| 985 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
|
| 986 | {
|
| 987 | const struct input_device_id *id;
|
| 988 | int error;
|
| 989 |
|
| 990 | id = input_match_device(handler, dev);
|
| 991 | if (!id)
|
| 992 | return -ENODEV;
|
| 993 |
|
| 994 | error = handler->connect(handler, dev, id);
|
| 995 | if (error && error != -ENODEV)
|
| 996 | pr_err("failed to attach handler %s to device %s, error: %d\n",
|
| 997 | handler->name, kobject_name(&dev->dev.kobj), error);
|
| 998 |
|
| 999 | return error;
|
| 1000 | }
|
| 1001 |
|
| 1002 | #ifdef CONFIG_PROC_FS
|
| 1003 |
|
| 1004 | static struct proc_dir_entry *proc_bus_input_dir;
|
| 1005 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
|
| 1006 | static int input_devices_state;
|
| 1007 |
|
| 1008 | static inline void input_wakeup_procfs_readers(void)
|
| 1009 | {
|
| 1010 | input_devices_state++;
|
| 1011 | wake_up(&input_devices_poll_wait);
|
| 1012 | }
|
| 1013 |
|
| 1014 | struct input_seq_state {
|
| 1015 | unsigned short pos;
|
| 1016 | bool mutex_acquired;
|
| 1017 | int input_devices_state;
|
| 1018 | };
|
| 1019 |
|
| 1020 | static __poll_t input_proc_devices_poll(struct file *file, poll_table *wait)
|
| 1021 | {
|
| 1022 | struct seq_file *seq = file->private_data;
|
| 1023 | struct input_seq_state *state = seq->private;
|
| 1024 |
|
| 1025 | poll_wait(file, &input_devices_poll_wait, wait);
|
| 1026 | if (state->input_devices_state != input_devices_state) {
|
| 1027 | state->input_devices_state = input_devices_state;
|
| 1028 | return EPOLLIN | EPOLLRDNORM;
|
| 1029 | }
|
| 1030 |
|
| 1031 | return 0;
|
| 1032 | }
|
| 1033 |
|
| 1034 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
|
| 1035 | {
|
| 1036 | struct input_seq_state *state = seq->private;
|
| 1037 | int error;
|
| 1038 |
|
| 1039 | error = mutex_lock_interruptible(&input_mutex);
|
| 1040 | if (error) {
|
| 1041 | state->mutex_acquired = false;
|
| 1042 | return ERR_PTR(error);
|
| 1043 | }
|
| 1044 |
|
| 1045 | state->mutex_acquired = true;
|
| 1046 |
|
| 1047 | return seq_list_start(&input_dev_list, *pos);
|
| 1048 | }
|
| 1049 |
|
| 1050 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 1051 | {
|
| 1052 | return seq_list_next(v, &input_dev_list, pos);
|
| 1053 | }
|
| 1054 |
|
| 1055 | static void input_seq_stop(struct seq_file *seq, void *v)
|
| 1056 | {
|
| 1057 | struct input_seq_state *state = seq->private;
|
| 1058 |
|
| 1059 | if (state->mutex_acquired)
|
| 1060 | mutex_unlock(&input_mutex);
|
| 1061 | }
|
| 1062 |
|
| 1063 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
|
| 1064 | unsigned long *bitmap, int max)
|
| 1065 | {
|
| 1066 | int i;
|
| 1067 | bool skip_empty = true;
|
| 1068 | char buf[18];
|
| 1069 |
|
| 1070 | seq_printf(seq, "B: %s=", name);
|
| 1071 |
|
| 1072 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
|
| 1073 | if (input_bits_to_string(buf, sizeof(buf),
|
| 1074 | bitmap[i], skip_empty)) {
|
| 1075 | skip_empty = false;
|
| 1076 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
|
| 1077 | }
|
| 1078 | }
|
| 1079 |
|
| 1080 | |
| 1081 | * If no output was produced print a single 0.
|
| 1082 |
|
| 1083 | if (skip_empty)
|
| 1084 | seq_putc(seq, '0');
|
| 1085 |
|
| 1086 | seq_putc(seq, '\n');
|
| 1087 | }
|
| 1088 |
|
| 1089 | static int input_devices_seq_show(struct seq_file *seq, void *v)
|
| 1090 | {
|
| 1091 | struct input_dev *dev = container_of(v, struct input_dev, node);
|
| 1092 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
| 1093 | struct input_handle *handle;
|
| 1094 |
|
| 1095 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
|
| 1096 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
|
| 1097 |
|
| 1098 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
|
| 1099 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
|
| 1100 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
|
| 1101 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
|
| 1102 | seq_puts(seq, "H: Handlers=");
|
| 1103 |
|
| 1104 | list_for_each_entry(handle, &dev->h_list, d_node)
|
| 1105 | seq_printf(seq, "%s ", handle->name);
|
| 1106 | seq_putc(seq, '\n');
|
| 1107 |
|
| 1108 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
|
| 1109 |
|
| 1110 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
|
| 1111 | if (test_bit(EV_KEY, dev->evbit))
|
| 1112 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
|
| 1113 | if (test_bit(EV_REL, dev->evbit))
|
| 1114 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
|
| 1115 | if (test_bit(EV_ABS, dev->evbit))
|
| 1116 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
|
| 1117 | if (test_bit(EV_MSC, dev->evbit))
|
| 1118 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
|
| 1119 | if (test_bit(EV_LED, dev->evbit))
|
| 1120 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
|
| 1121 | if (test_bit(EV_SND, dev->evbit))
|
| 1122 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
|
| 1123 | if (test_bit(EV_FF, dev->evbit))
|
| 1124 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
|
| 1125 | if (test_bit(EV_SW, dev->evbit))
|
| 1126 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
|
| 1127 |
|
| 1128 | seq_putc(seq, '\n');
|
| 1129 |
|
| 1130 | kfree(path);
|
| 1131 | return 0;
|
| 1132 | }
|
| 1133 |
|
| 1134 | static const struct seq_operations input_devices_seq_ops = {
|
| 1135 | .start = input_devices_seq_start,
|
| 1136 | .next = input_devices_seq_next,
|
| 1137 | .stop = input_seq_stop,
|
| 1138 | .show = input_devices_seq_show,
|
| 1139 | };
|
| 1140 |
|
| 1141 | static int input_proc_devices_open(struct inode *inode, struct file *file)
|
| 1142 | {
|
| 1143 | return seq_open_private(file, &input_devices_seq_ops,
|
| 1144 | sizeof(struct input_seq_state));
|
| 1145 | }
|
| 1146 |
|
| 1147 | static const struct proc_ops input_devices_proc_ops = {
|
| 1148 | .proc_open = input_proc_devices_open,
|
| 1149 | .proc_poll = input_proc_devices_poll,
|
| 1150 | .proc_read = seq_read,
|
| 1151 | .proc_lseek = seq_lseek,
|
| 1152 | .proc_release = seq_release_private,
|
| 1153 | };
|
| 1154 |
|
| 1155 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
|
| 1156 | {
|
| 1157 | struct input_seq_state *state = seq->private;
|
| 1158 | int error;
|
| 1159 |
|
| 1160 | error = mutex_lock_interruptible(&input_mutex);
|
| 1161 | if (error) {
|
| 1162 | state->mutex_acquired = false;
|
| 1163 | return ERR_PTR(error);
|
| 1164 | }
|
| 1165 |
|
| 1166 | state->mutex_acquired = true;
|
| 1167 | state->pos = *pos;
|
| 1168 |
|
| 1169 | return seq_list_start(&input_handler_list, *pos);
|
| 1170 | }
|
| 1171 |
|
| 1172 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 1173 | {
|
| 1174 | struct input_seq_state *state = seq->private;
|
| 1175 |
|
| 1176 | state->pos = *pos + 1;
|
| 1177 | return seq_list_next(v, &input_handler_list, pos);
|
| 1178 | }
|
| 1179 |
|
| 1180 | static int input_handlers_seq_show(struct seq_file *seq, void *v)
|
| 1181 | {
|
| 1182 | struct input_handler *handler = container_of(v, struct input_handler, node);
|
| 1183 | struct input_seq_state *state = seq->private;
|
| 1184 |
|
| 1185 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
|
| 1186 | if (handler->filter)
|
| 1187 | seq_puts(seq, " (filter)");
|
| 1188 | if (handler->legacy_minors)
|
| 1189 | seq_printf(seq, " Minor=%d", handler->minor);
|
| 1190 | seq_putc(seq, '\n');
|
| 1191 |
|
| 1192 | return 0;
|
| 1193 | }
|
| 1194 |
|
| 1195 | static const struct seq_operations input_handlers_seq_ops = {
|
| 1196 | .start = input_handlers_seq_start,
|
| 1197 | .next = input_handlers_seq_next,
|
| 1198 | .stop = input_seq_stop,
|
| 1199 | .show = input_handlers_seq_show,
|
| 1200 | };
|
| 1201 |
|
| 1202 | static int input_proc_handlers_open(struct inode *inode, struct file *file)
|
| 1203 | {
|
| 1204 | return seq_open_private(file, &input_handlers_seq_ops,
|
| 1205 | sizeof(struct input_seq_state));
|
| 1206 | }
|
| 1207 |
|
| 1208 | static const struct proc_ops input_handlers_proc_ops = {
|
| 1209 | .proc_open = input_proc_handlers_open,
|
| 1210 | .proc_read = seq_read,
|
| 1211 | .proc_lseek = seq_lseek,
|
| 1212 | .proc_release = seq_release_private,
|
| 1213 | };
|
| 1214 |
|
| 1215 | static int __init input_proc_init(void)
|
| 1216 | {
|
| 1217 | struct proc_dir_entry *entry;
|
| 1218 |
|
| 1219 | proc_bus_input_dir = proc_mkdir("bus/input", NULL);
|
| 1220 | if (!proc_bus_input_dir)
|
| 1221 | return -ENOMEM;
|
| 1222 |
|
| 1223 | entry = proc_create("devices", 0, proc_bus_input_dir,
|
| 1224 | &input_devices_proc_ops);
|
| 1225 | if (!entry)
|
| 1226 | goto fail1;
|
| 1227 |
|
| 1228 | entry = proc_create("handlers", 0, proc_bus_input_dir,
|
| 1229 | &input_handlers_proc_ops);
|
| 1230 | if (!entry)
|
| 1231 | goto fail2;
|
| 1232 |
|
| 1233 | return 0;
|
| 1234 |
|
| 1235 | fail2: remove_proc_entry("devices", proc_bus_input_dir);
|
| 1236 | fail1: remove_proc_entry("bus/input", NULL);
|
| 1237 | return -ENOMEM;
|
| 1238 | }
|
| 1239 |
|
| 1240 | static void input_proc_exit(void)
|
| 1241 | {
|
| 1242 | remove_proc_entry("devices", proc_bus_input_dir);
|
| 1243 | remove_proc_entry("handlers", proc_bus_input_dir);
|
| 1244 | remove_proc_entry("bus/input", NULL);
|
| 1245 | }
|
| 1246 |
|
| 1247 | #else
|
| 1248 | static inline void input_wakeup_procfs_readers(void) { }
|
| 1249 | static inline int input_proc_init(void) { return 0; }
|
| 1250 | static inline void input_proc_exit(void) { }
|
| 1251 | #endif
|
| 1252 |
|
| 1253 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \
|
| 1254 | static ssize_t input_dev_show_##name(struct device *dev, \
|
| 1255 | struct device_attribute *attr, \
|
| 1256 | char *buf) \
|
| 1257 | { \
|
| 1258 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1259 | \
|
| 1260 | return sysfs_emit(buf, "%s\n", \
|
| 1261 | input_dev->name ? input_dev->name : ""); \
|
| 1262 | } \
|
| 1263 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
|
| 1264 |
|
| 1265 | INPUT_DEV_STRING_ATTR_SHOW(name);
|
| 1266 | INPUT_DEV_STRING_ATTR_SHOW(phys);
|
| 1267 | INPUT_DEV_STRING_ATTR_SHOW(uniq);
|
| 1268 |
|
| 1269 | static int input_print_modalias_bits(char *buf, int size,
|
| 1270 | char name, const unsigned long *bm,
|
| 1271 | unsigned int min_bit, unsigned int max_bit)
|
| 1272 | {
|
| 1273 | int bit = min_bit;
|
| 1274 | int len = 0;
|
| 1275 |
|
| 1276 | len += snprintf(buf, max(size, 0), "%c", name);
|
| 1277 | for_each_set_bit_from(bit, bm, max_bit)
|
| 1278 | len += snprintf(buf + len, max(size - len, 0), "%X,", bit);
|
| 1279 | return len;
|
| 1280 | }
|
| 1281 |
|
| 1282 | static int input_print_modalias_parts(char *buf, int size, int full_len,
|
| 1283 | const struct input_dev *id)
|
| 1284 | {
|
| 1285 | int len, klen, remainder, space;
|
| 1286 |
|
| 1287 | len = snprintf(buf, max(size, 0),
|
| 1288 | "input:b%04Xv%04Xp%04Xe%04X-",
|
| 1289 | id->id.bustype, id->id.vendor,
|
| 1290 | id->id.product, id->id.version);
|
| 1291 |
|
| 1292 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1293 | 'e', id->evbit, 0, EV_MAX);
|
| 1294 |
|
| 1295 | |
| 1296 | * Calculate the remaining space in the buffer making sure we
|
| 1297 | * have place for the terminating 0.
|
| 1298 |
|
| 1299 | space = max(size - (len + 1), 0);
|
| 1300 |
|
| 1301 | klen = input_print_modalias_bits(buf + len, size - len,
|
| 1302 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
|
| 1303 | len += klen;
|
| 1304 |
|
| 1305 | |
| 1306 | * If we have more data than we can fit in the buffer, check
|
| 1307 | * if we can trim key data to fit in the rest. We will indicate
|
| 1308 | * that key data is incomplete by adding "+" sign at the end, like
|
| 1309 | * this: * "k1,2,3,45,+,".
|
| 1310 | *
|
| 1311 | * Note that we shortest key info (if present) is "k+," so we
|
| 1312 | * can only try to trim if key data is longer than that.
|
| 1313 |
|
| 1314 | if (full_len && size < full_len + 1 && klen > 3) {
|
| 1315 | remainder = full_len - len;
|
| 1316 | |
| 1317 | * We can only trim if we have space for the remainder
|
| 1318 | * and also for at least "k+," which is 3 more characters.
|
| 1319 |
|
| 1320 | if (remainder <= space - 3) {
|
| 1321 | |
| 1322 | * We are guaranteed to have 'k' in the buffer, so
|
| 1323 | * we need at least 3 additional bytes for storing
|
| 1324 | * "+," in addition to the remainder.
|
| 1325 |
|
| 1326 | for (int i = size - 1 - remainder - 3; i >= 0; i--) {
|
| 1327 | if (buf[i] == 'k' || buf[i] == ',') {
|
| 1328 | strcpy(buf + i + 1, "+,");
|
| 1329 | len = i + 3;
|
| 1330 | break;
|
| 1331 | }
|
| 1332 | }
|
| 1333 | }
|
| 1334 | }
|
| 1335 |
|
| 1336 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1337 | 'r', id->relbit, 0, REL_MAX);
|
| 1338 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1339 | 'a', id->absbit, 0, ABS_MAX);
|
| 1340 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1341 | 'm', id->mscbit, 0, MSC_MAX);
|
| 1342 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1343 | 'l', id->ledbit, 0, LED_MAX);
|
| 1344 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1345 | 's', id->sndbit, 0, SND_MAX);
|
| 1346 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1347 | 'f', id->ffbit, 0, FF_MAX);
|
| 1348 | len += input_print_modalias_bits(buf + len, size - len,
|
| 1349 | 'w', id->swbit, 0, SW_MAX);
|
| 1350 |
|
| 1351 | return len;
|
| 1352 | }
|
| 1353 |
|
| 1354 | static int input_print_modalias(char *buf, int size, const struct input_dev *id)
|
| 1355 | {
|
| 1356 | int full_len;
|
| 1357 |
|
| 1358 | |
| 1359 | * Printing is done in 2 passes: first one figures out total length
|
| 1360 | * needed for the modalias string, second one will try to trim key
|
| 1361 | * data in case when buffer is too small for the entire modalias.
|
| 1362 | * If the buffer is too small regardless, it will fill as much as it
|
| 1363 | * can (without trimming key data) into the buffer and leave it to
|
| 1364 | * the caller to figure out what to do with the result.
|
| 1365 |
|
| 1366 | full_len = input_print_modalias_parts(NULL, 0, 0, id);
|
| 1367 | return input_print_modalias_parts(buf, size, full_len, id);
|
| 1368 | }
|
| 1369 |
|
| 1370 | static ssize_t input_dev_show_modalias(struct device *dev,
|
| 1371 | struct device_attribute *attr,
|
| 1372 | char *buf)
|
| 1373 | {
|
| 1374 | struct input_dev *id = to_input_dev(dev);
|
| 1375 | ssize_t len;
|
| 1376 |
|
| 1377 | len = input_print_modalias(buf, PAGE_SIZE, id);
|
| 1378 | if (len < PAGE_SIZE - 2)
|
| 1379 | len += snprintf(buf + len, PAGE_SIZE - len, "\n");
|
| 1380 |
|
| 1381 | return min_t(int, len, PAGE_SIZE);
|
| 1382 | }
|
| 1383 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
|
| 1384 |
|
| 1385 | static int input_print_bitmap(char *buf, int buf_size, const unsigned long *bitmap,
|
| 1386 | int max, int add_cr);
|
| 1387 |
|
| 1388 | static ssize_t input_dev_show_properties(struct device *dev,
|
| 1389 | struct device_attribute *attr,
|
| 1390 | char *buf)
|
| 1391 | {
|
| 1392 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1393 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
|
| 1394 | INPUT_PROP_MAX, true);
|
| 1395 | return min_t(int, len, PAGE_SIZE);
|
| 1396 | }
|
| 1397 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
|
| 1398 |
|
| 1399 | static int input_inhibit_device(struct input_dev *dev);
|
| 1400 | static int input_uninhibit_device(struct input_dev *dev);
|
| 1401 |
|
| 1402 | static ssize_t inhibited_show(struct device *dev,
|
| 1403 | struct device_attribute *attr,
|
| 1404 | char *buf)
|
| 1405 | {
|
| 1406 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1407 |
|
| 1408 | return sysfs_emit(buf, "%d\n", input_dev->inhibited);
|
| 1409 | }
|
| 1410 |
|
| 1411 | static ssize_t inhibited_store(struct device *dev,
|
| 1412 | struct device_attribute *attr, const char *buf,
|
| 1413 | size_t len)
|
| 1414 | {
|
| 1415 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1416 | ssize_t rv;
|
| 1417 | bool inhibited;
|
| 1418 |
|
| 1419 | if (kstrtobool(buf, &inhibited))
|
| 1420 | return -EINVAL;
|
| 1421 |
|
| 1422 | if (inhibited)
|
| 1423 | rv = input_inhibit_device(input_dev);
|
| 1424 | else
|
| 1425 | rv = input_uninhibit_device(input_dev);
|
| 1426 |
|
| 1427 | if (rv != 0)
|
| 1428 | return rv;
|
| 1429 |
|
| 1430 | return len;
|
| 1431 | }
|
| 1432 |
|
| 1433 | static DEVICE_ATTR_RW(inhibited);
|
| 1434 |
|
| 1435 | static struct attribute *input_dev_attrs[] = {
|
| 1436 | &dev_attr_name.attr,
|
| 1437 | &dev_attr_phys.attr,
|
| 1438 | &dev_attr_uniq.attr,
|
| 1439 | &dev_attr_modalias.attr,
|
| 1440 | &dev_attr_properties.attr,
|
| 1441 | &dev_attr_inhibited.attr,
|
| 1442 | NULL
|
| 1443 | };
|
| 1444 |
|
| 1445 | static const struct attribute_group input_dev_attr_group = {
|
| 1446 | .attrs = input_dev_attrs,
|
| 1447 | };
|
| 1448 |
|
| 1449 | #define INPUT_DEV_ID_ATTR(name) \
|
| 1450 | static ssize_t input_dev_show_id_##name(struct device *dev, \
|
| 1451 | struct device_attribute *attr, \
|
| 1452 | char *buf) \
|
| 1453 | { \
|
| 1454 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1455 | return sysfs_emit(buf, "%04x\n", input_dev->id.name); \
|
| 1456 | } \
|
| 1457 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
|
| 1458 |
|
| 1459 | INPUT_DEV_ID_ATTR(bustype);
|
| 1460 | INPUT_DEV_ID_ATTR(vendor);
|
| 1461 | INPUT_DEV_ID_ATTR(product);
|
| 1462 | INPUT_DEV_ID_ATTR(version);
|
| 1463 |
|
| 1464 | static struct attribute *input_dev_id_attrs[] = {
|
| 1465 | &dev_attr_bustype.attr,
|
| 1466 | &dev_attr_vendor.attr,
|
| 1467 | &dev_attr_product.attr,
|
| 1468 | &dev_attr_version.attr,
|
| 1469 | NULL
|
| 1470 | };
|
| 1471 |
|
| 1472 | static const struct attribute_group input_dev_id_attr_group = {
|
| 1473 | .name = "id",
|
| 1474 | .attrs = input_dev_id_attrs,
|
| 1475 | };
|
| 1476 |
|
| 1477 | static int input_print_bitmap(char *buf, int buf_size, const unsigned long *bitmap,
|
| 1478 | int max, int add_cr)
|
| 1479 | {
|
| 1480 | int i;
|
| 1481 | int len = 0;
|
| 1482 | bool skip_empty = true;
|
| 1483 |
|
| 1484 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
|
| 1485 | len += input_bits_to_string(buf + len, max(buf_size - len, 0),
|
| 1486 | bitmap[i], skip_empty);
|
| 1487 | if (len) {
|
| 1488 | skip_empty = false;
|
| 1489 | if (i > 0)
|
| 1490 | len += snprintf(buf + len, max(buf_size - len, 0), " ");
|
| 1491 | }
|
| 1492 | }
|
| 1493 |
|
| 1494 | |
| 1495 | * If no output was produced print a single 0.
|
| 1496 |
|
| 1497 | if (len == 0)
|
| 1498 | len = snprintf(buf, buf_size, "%d", 0);
|
| 1499 |
|
| 1500 | if (add_cr)
|
| 1501 | len += snprintf(buf + len, max(buf_size - len, 0), "\n");
|
| 1502 |
|
| 1503 | return len;
|
| 1504 | }
|
| 1505 |
|
| 1506 | #define INPUT_DEV_CAP_ATTR(ev, bm) \
|
| 1507 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \
|
| 1508 | struct device_attribute *attr, \
|
| 1509 | char *buf) \
|
| 1510 | { \
|
| 1511 | struct input_dev *input_dev = to_input_dev(dev); \
|
| 1512 | int len = input_print_bitmap(buf, PAGE_SIZE, \
|
| 1513 | input_dev->bm##bit, ev##_MAX, \
|
| 1514 | true); \
|
| 1515 | return min_t(int, len, PAGE_SIZE); \
|
| 1516 | } \
|
| 1517 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
|
| 1518 |
|
| 1519 | INPUT_DEV_CAP_ATTR(EV, ev);
|
| 1520 | INPUT_DEV_CAP_ATTR(KEY, key);
|
| 1521 | INPUT_DEV_CAP_ATTR(REL, rel);
|
| 1522 | INPUT_DEV_CAP_ATTR(ABS, abs);
|
| 1523 | INPUT_DEV_CAP_ATTR(MSC, msc);
|
| 1524 | INPUT_DEV_CAP_ATTR(LED, led);
|
| 1525 | INPUT_DEV_CAP_ATTR(SND, snd);
|
| 1526 | INPUT_DEV_CAP_ATTR(FF, ff);
|
| 1527 | INPUT_DEV_CAP_ATTR(SW, sw);
|
| 1528 |
|
| 1529 | static struct attribute *input_dev_caps_attrs[] = {
|
| 1530 | &dev_attr_ev.attr,
|
| 1531 | &dev_attr_key.attr,
|
| 1532 | &dev_attr_rel.attr,
|
| 1533 | &dev_attr_abs.attr,
|
| 1534 | &dev_attr_msc.attr,
|
| 1535 | &dev_attr_led.attr,
|
| 1536 | &dev_attr_snd.attr,
|
| 1537 | &dev_attr_ff.attr,
|
| 1538 | &dev_attr_sw.attr,
|
| 1539 | NULL
|
| 1540 | };
|
| 1541 |
|
| 1542 | static const struct attribute_group input_dev_caps_attr_group = {
|
| 1543 | .name = "capabilities",
|
| 1544 | .attrs = input_dev_caps_attrs,
|
| 1545 | };
|
| 1546 |
|
| 1547 | static const struct attribute_group *input_dev_attr_groups[] = {
|
| 1548 | &input_dev_attr_group,
|
| 1549 | &input_dev_id_attr_group,
|
| 1550 | &input_dev_caps_attr_group,
|
| 1551 | &input_poller_attribute_group,
|
| 1552 | NULL
|
| 1553 | };
|
| 1554 |
|
| 1555 | static void input_dev_release(struct device *device)
|
| 1556 | {
|
| 1557 | struct input_dev *dev = to_input_dev(device);
|
| 1558 |
|
| 1559 | input_ff_destroy(dev);
|
| 1560 | input_mt_destroy_slots(dev);
|
| 1561 | kfree(dev->poller);
|
| 1562 | kfree(dev->absinfo);
|
| 1563 | kfree(dev->vals);
|
| 1564 | kfree(dev);
|
| 1565 |
|
| 1566 | module_put(THIS_MODULE);
|
| 1567 | }
|
| 1568 |
|
| 1569 | |
| 1570 | * Input uevent interface - loading event handlers based on
|
| 1571 | * device bitfields.
|
| 1572 |
|
| 1573 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
|
| 1574 | const char *name, const unsigned long *bitmap, int max)
|
| 1575 | {
|
| 1576 | int len;
|
| 1577 |
|
| 1578 | if (add_uevent_var(env, "%s", name))
|
| 1579 | return -ENOMEM;
|
| 1580 |
|
| 1581 | len = input_print_bitmap(&env->buf[env->buflen - 1],
|
| 1582 | sizeof(env->buf) - env->buflen,
|
| 1583 | bitmap, max, false);
|
| 1584 | if (len >= (sizeof(env->buf) - env->buflen))
|
| 1585 | return -ENOMEM;
|
| 1586 |
|
| 1587 | env->buflen += len;
|
| 1588 | return 0;
|
| 1589 | }
|
| 1590 |
|
| 1591 | |
| 1592 | * This is a pretty gross hack. When building uevent data the driver core
|
| 1593 | * may try adding more environment variables to kobj_uevent_env without
|
| 1594 | * telling us, so we have no idea how much of the buffer we can use to
|
| 1595 | * avoid overflows/-ENOMEM elsewhere. To work around this let's artificially
|
| 1596 | * reduce amount of memory we will use for the modalias environment variable.
|
| 1597 | *
|
| 1598 | * The potential additions are:
|
| 1599 | *
|
| 1600 | * SEQNUM=18446744073709551615 - (%llu - 28 bytes)
|
| 1601 | * HOME=/ (6 bytes)
|
| 1602 | * PATH=/sbin:/bin:/usr/sbin:/usr/bin (34 bytes)
|
| 1603 | *
|
| 1604 | * 68 bytes total. Allow extra buffer - 96 bytes
|
| 1605 |
|
| 1606 | #define UEVENT_ENV_EXTRA_LEN 96
|
| 1607 |
|
| 1608 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
|
| 1609 | const struct input_dev *dev)
|
| 1610 | {
|
| 1611 | int len;
|
| 1612 |
|
| 1613 | if (add_uevent_var(env, "MODALIAS="))
|
| 1614 | return -ENOMEM;
|
| 1615 |
|
| 1616 | len = input_print_modalias(&env->buf[env->buflen - 1],
|
| 1617 | (int)sizeof(env->buf) - env->buflen -
|
| 1618 | UEVENT_ENV_EXTRA_LEN,
|
| 1619 | dev);
|
| 1620 | if (len >= ((int)sizeof(env->buf) - env->buflen -
|
| 1621 | UEVENT_ENV_EXTRA_LEN))
|
| 1622 | return -ENOMEM;
|
| 1623 |
|
| 1624 | env->buflen += len;
|
| 1625 | return 0;
|
| 1626 | }
|
| 1627 |
|
| 1628 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
|
| 1629 | do { \
|
| 1630 | int err = add_uevent_var(env, fmt, val); \
|
| 1631 | if (err) \
|
| 1632 | return err; \
|
| 1633 | } while (0)
|
| 1634 |
|
| 1635 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
|
| 1636 | do { \
|
| 1637 | int err = input_add_uevent_bm_var(env, name, bm, max); \
|
| 1638 | if (err) \
|
| 1639 | return err; \
|
| 1640 | } while (0)
|
| 1641 |
|
| 1642 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
|
| 1643 | do { \
|
| 1644 | int err = input_add_uevent_modalias_var(env, dev); \
|
| 1645 | if (err) \
|
| 1646 | return err; \
|
| 1647 | } while (0)
|
| 1648 |
|
| 1649 | static int input_dev_uevent(const struct device *device, struct kobj_uevent_env *env)
|
| 1650 | {
|
| 1651 | const struct input_dev *dev = to_input_dev(device);
|
| 1652 |
|
| 1653 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
|
| 1654 | dev->id.bustype, dev->id.vendor,
|
| 1655 | dev->id.product, dev->id.version);
|
| 1656 | if (dev->name)
|
| 1657 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
|
| 1658 | if (dev->phys)
|
| 1659 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
|
| 1660 | if (dev->uniq)
|
| 1661 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
|
| 1662 |
|
| 1663 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
|
| 1664 |
|
| 1665 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
|
| 1666 | if (test_bit(EV_KEY, dev->evbit))
|
| 1667 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
|
| 1668 | if (test_bit(EV_REL, dev->evbit))
|
| 1669 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
|
| 1670 | if (test_bit(EV_ABS, dev->evbit))
|
| 1671 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
|
| 1672 | if (test_bit(EV_MSC, dev->evbit))
|
| 1673 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
|
| 1674 | if (test_bit(EV_LED, dev->evbit))
|
| 1675 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
|
| 1676 | if (test_bit(EV_SND, dev->evbit))
|
| 1677 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
|
| 1678 | if (test_bit(EV_FF, dev->evbit))
|
| 1679 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
|
| 1680 | if (test_bit(EV_SW, dev->evbit))
|
| 1681 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
|
| 1682 |
|
| 1683 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
|
| 1684 |
|
| 1685 | return 0;
|
| 1686 | }
|
| 1687 |
|
| 1688 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \
|
| 1689 | do { \
|
| 1690 | int i; \
|
| 1691 | bool active; \
|
| 1692 | \
|
| 1693 | if (!test_bit(EV_##type, dev->evbit)) \
|
| 1694 | break; \
|
| 1695 | \
|
| 1696 | for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
|
| 1697 | active = test_bit(i, dev->bits); \
|
| 1698 | if (!active && !on) \
|
| 1699 | continue; \
|
| 1700 | \
|
| 1701 | dev->event(dev, EV_##type, i, on ? active : 0); \
|
| 1702 | } \
|
| 1703 | } while (0)
|
| 1704 |
|
| 1705 | static void input_dev_toggle(struct input_dev *dev, bool activate)
|
| 1706 | {
|
| 1707 | if (!dev->event)
|
| 1708 | return;
|
| 1709 |
|
| 1710 | INPUT_DO_TOGGLE(dev, LED, led, activate);
|
| 1711 | INPUT_DO_TOGGLE(dev, SND, snd, activate);
|
| 1712 |
|
| 1713 | if (activate && test_bit(EV_REP, dev->evbit)) {
|
| 1714 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
|
| 1715 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
|
| 1716 | }
|
| 1717 | }
|
| 1718 |
|
| 1719 | |
| 1720 | * input_reset_device() - reset/restore the state of input device
|
| 1721 | * @dev: input device whose state needs to be reset
|
| 1722 | *
|
| 1723 | * This function tries to reset the state of an opened input device and
|
| 1724 | * bring internal state and state if the hardware in sync with each other.
|
| 1725 | * We mark all keys as released, restore LED state, repeat rate, etc.
|
| 1726 |
|
| 1727 | void input_reset_device(struct input_dev *dev)
|
| 1728 | {
|
| 1729 | guard(mutex)(&dev->mutex);
|
| 1730 | guard(spinlock_irqsave)(&dev->event_lock);
|
| 1731 |
|
| 1732 | input_dev_toggle(dev, true);
|
| 1733 | if (input_dev_release_keys(dev))
|
| 1734 | input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
|
| 1735 | }
|
| 1736 | EXPORT_SYMBOL(input_reset_device);
|
| 1737 |
|
| 1738 | static int input_inhibit_device(struct input_dev *dev)
|
| 1739 | {
|
| 1740 | guard(mutex)(&dev->mutex);
|
| 1741 |
|
| 1742 | if (dev->inhibited)
|
| 1743 | return 0;
|
| 1744 |
|
| 1745 | if (dev->users) {
|
| 1746 | if (dev->close)
|
| 1747 | dev->close(dev);
|
| 1748 | if (dev->poller)
|
| 1749 | input_dev_poller_stop(dev->poller);
|
| 1750 | }
|
| 1751 |
|
| 1752 | scoped_guard(spinlock_irq, &dev->event_lock) {
|
| 1753 | input_mt_release_slots(dev);
|
| 1754 | input_dev_release_keys(dev);
|
| 1755 | input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
|
| 1756 | input_dev_toggle(dev, false);
|
| 1757 | }
|
| 1758 |
|
| 1759 | dev->inhibited = true;
|
| 1760 |
|
| 1761 | return 0;
|
| 1762 | }
|
| 1763 |
|
| 1764 | static int input_uninhibit_device(struct input_dev *dev)
|
| 1765 | {
|
| 1766 | int error;
|
| 1767 |
|
| 1768 | guard(mutex)(&dev->mutex);
|
| 1769 |
|
| 1770 | if (!dev->inhibited)
|
| 1771 | return 0;
|
| 1772 |
|
| 1773 | if (dev->users) {
|
| 1774 | if (dev->open) {
|
| 1775 | error = dev->open(dev);
|
| 1776 | if (error)
|
| 1777 | return error;
|
| 1778 | }
|
| 1779 | if (dev->poller)
|
| 1780 | input_dev_poller_start(dev->poller);
|
| 1781 | }
|
| 1782 |
|
| 1783 | dev->inhibited = false;
|
| 1784 |
|
| 1785 | scoped_guard(spinlock_irq, &dev->event_lock)
|
| 1786 | input_dev_toggle(dev, true);
|
| 1787 |
|
| 1788 | return 0;
|
| 1789 | }
|
| 1790 |
|
| 1791 | static int input_dev_suspend(struct device *dev)
|
| 1792 | {
|
| 1793 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1794 |
|
| 1795 | guard(spinlock_irq)(&input_dev->event_lock);
|
| 1796 |
|
| 1797 | |
| 1798 | * Keys that are pressed now are unlikely to be
|
| 1799 | * still pressed when we resume.
|
| 1800 |
|
| 1801 | if (input_dev_release_keys(input_dev))
|
| 1802 | input_handle_event(input_dev, EV_SYN, SYN_REPORT, 1);
|
| 1803 |
|
| 1804 |
|
| 1805 | input_dev_toggle(input_dev, false);
|
| 1806 |
|
| 1807 | return 0;
|
| 1808 | }
|
| 1809 |
|
| 1810 | static int input_dev_resume(struct device *dev)
|
| 1811 | {
|
| 1812 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1813 |
|
| 1814 | guard(spinlock_irq)(&input_dev->event_lock);
|
| 1815 |
|
| 1816 |
|
| 1817 | input_dev_toggle(input_dev, true);
|
| 1818 |
|
| 1819 | return 0;
|
| 1820 | }
|
| 1821 |
|
| 1822 | static int input_dev_freeze(struct device *dev)
|
| 1823 | {
|
| 1824 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1825 |
|
| 1826 | guard(spinlock_irq)(&input_dev->event_lock);
|
| 1827 |
|
| 1828 | |
| 1829 | * Keys that are pressed now are unlikely to be
|
| 1830 | * still pressed when we resume.
|
| 1831 |
|
| 1832 | if (input_dev_release_keys(input_dev))
|
| 1833 | input_handle_event(input_dev, EV_SYN, SYN_REPORT, 1);
|
| 1834 |
|
| 1835 | return 0;
|
| 1836 | }
|
| 1837 |
|
| 1838 | static int input_dev_poweroff(struct device *dev)
|
| 1839 | {
|
| 1840 | struct input_dev *input_dev = to_input_dev(dev);
|
| 1841 |
|
| 1842 | guard(spinlock_irq)(&input_dev->event_lock);
|
| 1843 |
|
| 1844 |
|
| 1845 | input_dev_toggle(input_dev, false);
|
| 1846 |
|
| 1847 | return 0;
|
| 1848 | }
|
| 1849 |
|
| 1850 | static const struct dev_pm_ops input_dev_pm_ops = {
|
| 1851 | .suspend = input_dev_suspend,
|
| 1852 | .resume = input_dev_resume,
|
| 1853 | .freeze = input_dev_freeze,
|
| 1854 | .poweroff = input_dev_poweroff,
|
| 1855 | .restore = input_dev_resume,
|
| 1856 | };
|
| 1857 |
|
| 1858 | static const struct device_type input_dev_type = {
|
| 1859 | .groups = input_dev_attr_groups,
|
| 1860 | .release = input_dev_release,
|
| 1861 | .uevent = input_dev_uevent,
|
| 1862 | .pm = pm_sleep_ptr(&input_dev_pm_ops),
|
| 1863 | };
|
| 1864 |
|
| 1865 | static char *input_devnode(const struct device *dev, umode_t *mode)
|
| 1866 | {
|
| 1867 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
|
| 1868 | }
|
| 1869 |
|
| 1870 | const struct class input_class = {
|
| 1871 | .name = "input",
|
| 1872 | .devnode = input_devnode,
|
| 1873 | };
|
| 1874 | EXPORT_SYMBOL_GPL(input_class);
|
| 1875 |
|
| 1876 | |
| 1877 | * input_allocate_device - allocate memory for new input device
|
| 1878 | *
|
| 1879 | * Returns prepared struct input_dev or %NULL.
|
| 1880 | *
|
| 1881 | * NOTE: Use input_free_device() to free devices that have not been
|
| 1882 | * registered; input_unregister_device() should be used for already
|
| 1883 | * registered devices.
|
| 1884 |
|
| 1885 | struct input_dev *input_allocate_device(void)
|
| 1886 | {
|
| 1887 | static atomic_t input_no = ATOMIC_INIT(-1);
|
| 1888 | struct input_dev *dev;
|
| 1889 |
|
| 1890 | dev = kzalloc_obj(*dev);
|
| 1891 | if (!dev)
|
| 1892 | return NULL;
|
| 1893 |
|
| 1894 | |
| 1895 | * Start with space for SYN_REPORT + 7 EV_KEY/EV_MSC events + 2 spare,
|
| 1896 | * see input_estimate_events_per_packet(). We will tune the number
|
| 1897 | * when we register the device.
|
| 1898 |
|
| 1899 | dev->max_vals = 10;
|
| 1900 | dev->vals = kzalloc_objs(*dev->vals, dev->max_vals);
|
| 1901 | if (!dev->vals) {
|
| 1902 | kfree(dev);
|
| 1903 | return NULL;
|
| 1904 | }
|
| 1905 |
|
| 1906 | mutex_init(&dev->mutex);
|
| 1907 | spin_lock_init(&dev->event_lock);
|
| 1908 | timer_setup(&dev->timer, NULL, 0);
|
| 1909 | INIT_LIST_HEAD(&dev->h_list);
|
| 1910 | INIT_LIST_HEAD(&dev->node);
|
| 1911 |
|
| 1912 | dev->dev.type = &input_dev_type;
|
| 1913 | dev->dev.class = &input_class;
|
| 1914 | device_initialize(&dev->dev);
|
| 1915 | |
| 1916 | * From this point on we can no longer simply "kfree(dev)", we need
|
| 1917 | * to use input_free_device() so that device core properly frees its
|
| 1918 | * resources associated with the input device.
|
| 1919 |
|
| 1920 |
|
| 1921 | dev_set_name(&dev->dev, "input%lu",
|
| 1922 | (unsigned long)atomic_inc_return(&input_no));
|
| 1923 |
|
| 1924 | __module_get(THIS_MODULE);
|
| 1925 |
|
| 1926 | return dev;
|
| 1927 | }
|
| 1928 | EXPORT_SYMBOL(input_allocate_device);
|
| 1929 |
|
| 1930 | struct input_devres {
|
| 1931 | struct input_dev *input;
|
| 1932 | };
|
| 1933 |
|
| 1934 | static int devm_input_device_match(struct device *dev, void *res, void *data)
|
| 1935 | {
|
| 1936 | struct input_devres *devres = res;
|
| 1937 |
|
| 1938 | return devres->input == data;
|
| 1939 | }
|
| 1940 |
|
| 1941 | static void devm_input_device_release(struct device *dev, void *res)
|
| 1942 | {
|
| 1943 | struct input_devres *devres = res;
|
| 1944 | struct input_dev *input = devres->input;
|
| 1945 |
|
| 1946 | dev_dbg(dev, "%s: dropping reference to %s\n",
|
| 1947 | __func__, dev_name(&input->dev));
|
| 1948 | input_put_device(input);
|
| 1949 | }
|
| 1950 |
|
| 1951 | |
| 1952 | * devm_input_allocate_device - allocate managed input device
|
| 1953 | * @dev: device owning the input device being created
|
| 1954 | *
|
| 1955 | * Returns prepared struct input_dev or %NULL.
|
| 1956 | *
|
| 1957 | * Managed input devices do not need to be explicitly unregistered or
|
| 1958 | * freed as it will be done automatically when owner device unbinds from
|
| 1959 | * its driver (or binding fails). Once managed input device is allocated,
|
| 1960 | * it is ready to be set up and registered in the same fashion as regular
|
| 1961 | * input device. There are no special devm_input_device_[un]register()
|
| 1962 | * variants, regular ones work with both managed and unmanaged devices,
|
| 1963 | * should you need them. In most cases however, managed input device need
|
| 1964 | * not be explicitly unregistered or freed.
|
| 1965 | *
|
| 1966 | * NOTE: the owner device is set up as parent of input device and users
|
| 1967 | * should not override it.
|
| 1968 |
|
| 1969 | struct input_dev *devm_input_allocate_device(struct device *dev)
|
| 1970 | {
|
| 1971 | struct input_dev *input;
|
| 1972 | struct input_devres *devres;
|
| 1973 |
|
| 1974 | devres = devres_alloc(devm_input_device_release,
|
| 1975 | sizeof(*devres), GFP_KERNEL);
|
| 1976 | if (!devres)
|
| 1977 | return NULL;
|
| 1978 |
|
| 1979 | input = input_allocate_device();
|
| 1980 | if (!input) {
|
| 1981 | devres_free(devres);
|
| 1982 | return NULL;
|
| 1983 | }
|
| 1984 |
|
| 1985 | input->dev.parent = dev;
|
| 1986 | input->devres_managed = true;
|
| 1987 |
|
| 1988 | devres->input = input;
|
| 1989 | devres_add(dev, devres);
|
| 1990 |
|
| 1991 | return input;
|
| 1992 | }
|
| 1993 | EXPORT_SYMBOL(devm_input_allocate_device);
|
| 1994 |
|
| 1995 | |
| 1996 | * input_free_device - free memory occupied by input_dev structure
|
| 1997 | * @dev: input device to free
|
| 1998 | *
|
| 1999 | * This function should only be used if input_register_device()
|
| 2000 | * was not called yet or if it failed. Once device was registered
|
| 2001 | * use input_unregister_device() and memory will be freed once last
|
| 2002 | * reference to the device is dropped.
|
| 2003 | *
|
| 2004 | * Device should be allocated by input_allocate_device().
|
| 2005 | *
|
| 2006 | * NOTE: If there are references to the input device then memory
|
| 2007 | * will not be freed until last reference is dropped.
|
| 2008 |
|
| 2009 | void input_free_device(struct input_dev *dev)
|
| 2010 | {
|
| 2011 | if (dev) {
|
| 2012 | if (dev->devres_managed)
|
| 2013 | WARN_ON(devres_destroy(dev->dev.parent,
|
| 2014 | devm_input_device_release,
|
| 2015 | devm_input_device_match,
|
| 2016 | dev));
|
| 2017 | input_put_device(dev);
|
| 2018 | }
|
| 2019 | }
|
| 2020 | EXPORT_SYMBOL(input_free_device);
|
| 2021 |
|
| 2022 | |
| 2023 | * input_set_timestamp - set timestamp for input events
|
| 2024 | * @dev: input device to set timestamp for
|
| 2025 | * @timestamp: the time at which the event has occurred
|
| 2026 | * in CLOCK_MONOTONIC
|
| 2027 | *
|
| 2028 | * This function is intended to provide to the input system a more
|
| 2029 | * accurate time of when an event actually occurred. The driver should
|
| 2030 | * call this function as soon as a timestamp is acquired ensuring
|
| 2031 | * clock conversions in input_set_timestamp are done correctly.
|
| 2032 | *
|
| 2033 | * The system entering suspend state between timestamp acquisition and
|
| 2034 | * calling input_set_timestamp can result in inaccurate conversions.
|
| 2035 |
|
| 2036 | void input_set_timestamp(struct input_dev *dev, ktime_t timestamp)
|
| 2037 | {
|
| 2038 | dev->timestamp[INPUT_CLK_MONO] = timestamp;
|
| 2039 | dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp);
|
| 2040 | dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp,
|
| 2041 | TK_OFFS_BOOT);
|
| 2042 | }
|
| 2043 | EXPORT_SYMBOL(input_set_timestamp);
|
| 2044 |
|
| 2045 | |
| 2046 | * input_get_timestamp - get timestamp for input events
|
| 2047 | * @dev: input device to get timestamp from
|
| 2048 | *
|
| 2049 | * A valid timestamp is a timestamp of non-zero value.
|
| 2050 |
|
| 2051 | ktime_t *input_get_timestamp(struct input_dev *dev)
|
| 2052 | {
|
| 2053 | const ktime_t invalid_timestamp = ktime_set(0, 0);
|
| 2054 |
|
| 2055 | if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp))
|
| 2056 | input_set_timestamp(dev, ktime_get());
|
| 2057 |
|
| 2058 | return dev->timestamp;
|
| 2059 | }
|
| 2060 | EXPORT_SYMBOL(input_get_timestamp);
|
| 2061 |
|
| 2062 | |
| 2063 | * input_set_capability - mark device as capable of a certain event
|
| 2064 | * @dev: device that is capable of emitting or accepting event
|
| 2065 | * @type: type of the event (EV_KEY, EV_REL, etc...)
|
| 2066 | * @code: event code
|
| 2067 | *
|
| 2068 | * In addition to setting up corresponding bit in appropriate capability
|
| 2069 | * bitmap the function also adjusts dev->evbit.
|
| 2070 |
|
| 2071 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
|
| 2072 | {
|
| 2073 | if (type < EV_CNT && input_max_code[type] &&
|
| 2074 | code > input_max_code[type]) {
|
| 2075 | pr_err("%s: invalid code %u for type %u\n", __func__, code,
|
| 2076 | type);
|
| 2077 | dump_stack();
|
| 2078 | return;
|
| 2079 | }
|
| 2080 |
|
| 2081 | switch (type) {
|
| 2082 | case EV_KEY:
|
| 2083 | __set_bit(code, dev->keybit);
|
| 2084 | break;
|
| 2085 |
|
| 2086 | case EV_REL:
|
| 2087 | __set_bit(code, dev->relbit);
|
| 2088 | break;
|
| 2089 |
|
| 2090 | case EV_ABS:
|
| 2091 | input_alloc_absinfo(dev);
|
| 2092 | __set_bit(code, dev->absbit);
|
| 2093 | break;
|
| 2094 |
|
| 2095 | case EV_MSC:
|
| 2096 | __set_bit(code, dev->mscbit);
|
| 2097 | break;
|
| 2098 |
|
| 2099 | case EV_SW:
|
| 2100 | __set_bit(code, dev->swbit);
|
| 2101 | break;
|
| 2102 |
|
| 2103 | case EV_LED:
|
| 2104 | __set_bit(code, dev->ledbit);
|
| 2105 | break;
|
| 2106 |
|
| 2107 | case EV_SND:
|
| 2108 | __set_bit(code, dev->sndbit);
|
| 2109 | break;
|
| 2110 |
|
| 2111 | case EV_FF:
|
| 2112 | __set_bit(code, dev->ffbit);
|
| 2113 | break;
|
| 2114 |
|
| 2115 | case EV_PWR:
|
| 2116 |
|
| 2117 | break;
|
| 2118 |
|
| 2119 | default:
|
| 2120 | pr_err("%s: unknown type %u (code %u)\n", __func__, type, code);
|
| 2121 | dump_stack();
|
| 2122 | return;
|
| 2123 | }
|
| 2124 |
|
| 2125 | __set_bit(type, dev->evbit);
|
| 2126 | }
|
| 2127 | EXPORT_SYMBOL(input_set_capability);
|
| 2128 |
|
| 2129 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
|
| 2130 | {
|
| 2131 | int mt_slots;
|
| 2132 | int i;
|
| 2133 | unsigned int events;
|
| 2134 |
|
| 2135 | if (dev->mt) {
|
| 2136 | mt_slots = dev->mt->num_slots;
|
| 2137 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
|
| 2138 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
|
| 2139 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1;
|
| 2140 | mt_slots = clamp(mt_slots, 2, 32);
|
| 2141 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
|
| 2142 | mt_slots = 2;
|
| 2143 | } else {
|
| 2144 | mt_slots = 0;
|
| 2145 | }
|
| 2146 |
|
| 2147 | events = mt_slots + 1;
|
| 2148 |
|
| 2149 | if (test_bit(EV_ABS, dev->evbit))
|
| 2150 | for_each_set_bit(i, dev->absbit, ABS_CNT)
|
| 2151 | events += input_is_mt_axis(i) ? mt_slots : 1;
|
| 2152 |
|
| 2153 | if (test_bit(EV_REL, dev->evbit))
|
| 2154 | events += bitmap_weight(dev->relbit, REL_CNT);
|
| 2155 |
|
| 2156 |
|
| 2157 | events += 7;
|
| 2158 |
|
| 2159 | return events;
|
| 2160 | }
|
| 2161 |
|
| 2162 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
|
| 2163 | do { \
|
| 2164 | if (!test_bit(EV_##type, dev->evbit)) \
|
| 2165 | memset(dev->bits##bit, 0, \
|
| 2166 | sizeof(dev->bits##bit)); \
|
| 2167 | } while (0)
|
| 2168 |
|
| 2169 | static void input_cleanse_bitmasks(struct input_dev *dev)
|
| 2170 | {
|
| 2171 | INPUT_CLEANSE_BITMASK(dev, KEY, key);
|
| 2172 | INPUT_CLEANSE_BITMASK(dev, REL, rel);
|
| 2173 | INPUT_CLEANSE_BITMASK(dev, ABS, abs);
|
| 2174 | INPUT_CLEANSE_BITMASK(dev, MSC, msc);
|
| 2175 | INPUT_CLEANSE_BITMASK(dev, LED, led);
|
| 2176 | INPUT_CLEANSE_BITMASK(dev, SND, snd);
|
| 2177 | INPUT_CLEANSE_BITMASK(dev, FF, ff);
|
| 2178 | INPUT_CLEANSE_BITMASK(dev, SW, sw);
|
| 2179 | }
|
| 2180 |
|
| 2181 | static void __input_unregister_device(struct input_dev *dev)
|
| 2182 | {
|
| 2183 | struct input_handle *handle, *next;
|
| 2184 |
|
| 2185 | input_disconnect_device(dev);
|
| 2186 |
|
| 2187 | scoped_guard(mutex, &input_mutex) {
|
| 2188 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
|
| 2189 | handle->handler->disconnect(handle);
|
| 2190 | WARN_ON(!list_empty(&dev->h_list));
|
| 2191 |
|
| 2192 | timer_delete_sync(&dev->timer);
|
| 2193 | list_del_init(&dev->node);
|
| 2194 |
|
| 2195 | input_wakeup_procfs_readers();
|
| 2196 | }
|
| 2197 |
|
| 2198 | device_del(&dev->dev);
|
| 2199 | }
|
| 2200 |
|
| 2201 | static void devm_input_device_unregister(struct device *dev, void *res)
|
| 2202 | {
|
| 2203 | struct input_devres *devres = res;
|
| 2204 | struct input_dev *input = devres->input;
|
| 2205 |
|
| 2206 | dev_dbg(dev, "%s: unregistering device %s\n",
|
| 2207 | __func__, dev_name(&input->dev));
|
| 2208 | __input_unregister_device(input);
|
| 2209 | }
|
| 2210 |
|
| 2211 | |
| 2212 | * Generate software autorepeat event. Note that we take
|
| 2213 | * dev->event_lock here to avoid racing with input_event
|
| 2214 | * which may cause keys get "stuck".
|
| 2215 |
|
| 2216 | static void input_repeat_key(struct timer_list *t)
|
| 2217 | {
|
| 2218 | struct input_dev *dev = timer_container_of(dev, t, timer);
|
| 2219 |
|
| 2220 | guard(spinlock_irqsave)(&dev->event_lock);
|
| 2221 |
|
| 2222 | if (!dev->inhibited &&
|
| 2223 | test_bit(dev->repeat_key, dev->key) &&
|
| 2224 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
|
| 2225 |
|
| 2226 | input_set_timestamp(dev, ktime_get());
|
| 2227 | input_handle_event(dev, EV_KEY, dev->repeat_key, 2);
|
| 2228 | input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
|
| 2229 |
|
| 2230 | if (dev->rep[REP_PERIOD])
|
| 2231 | mod_timer(&dev->timer, jiffies +
|
| 2232 | msecs_to_jiffies(dev->rep[REP_PERIOD]));
|
| 2233 | }
|
| 2234 | }
|
| 2235 |
|
| 2236 | |
| 2237 | * input_enable_softrepeat - enable software autorepeat
|
| 2238 | * @dev: input device
|
| 2239 | * @delay: repeat delay
|
| 2240 | * @period: repeat period
|
| 2241 | *
|
| 2242 | * Enable software autorepeat on the input device.
|
| 2243 |
|
| 2244 | void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
|
| 2245 | {
|
| 2246 | dev->timer.function = input_repeat_key;
|
| 2247 | dev->rep[REP_DELAY] = delay;
|
| 2248 | dev->rep[REP_PERIOD] = period;
|
| 2249 | }
|
| 2250 | EXPORT_SYMBOL(input_enable_softrepeat);
|
| 2251 |
|
| 2252 | bool input_device_enabled(struct input_dev *dev)
|
| 2253 | {
|
| 2254 | lockdep_assert_held(&dev->mutex);
|
| 2255 |
|
| 2256 | return !dev->inhibited && dev->users > 0;
|
| 2257 | }
|
| 2258 | EXPORT_SYMBOL_GPL(input_device_enabled);
|
| 2259 |
|
| 2260 | static int input_device_tune_vals(struct input_dev *dev)
|
| 2261 | {
|
| 2262 | struct input_value *vals;
|
| 2263 | unsigned int packet_size;
|
| 2264 | unsigned int max_vals;
|
| 2265 |
|
| 2266 | packet_size = input_estimate_events_per_packet(dev);
|
| 2267 | if (dev->hint_events_per_packet < packet_size)
|
| 2268 | dev->hint_events_per_packet = packet_size;
|
| 2269 |
|
| 2270 | max_vals = dev->hint_events_per_packet + 2;
|
| 2271 | if (dev->max_vals >= max_vals)
|
| 2272 | return 0;
|
| 2273 |
|
| 2274 | vals = kcalloc(max_vals, sizeof(*vals), GFP_KERNEL);
|
| 2275 | if (!vals)
|
| 2276 | return -ENOMEM;
|
| 2277 |
|
| 2278 | scoped_guard(spinlock_irq, &dev->event_lock) {
|
| 2279 | dev->max_vals = max_vals;
|
| 2280 | swap(dev->vals, vals);
|
| 2281 | }
|
| 2282 |
|
| 2283 |
|
| 2284 | kfree(vals);
|
| 2285 |
|
| 2286 | return 0;
|
| 2287 | }
|
| 2288 |
|
| 2289 | |
| 2290 | * input_register_device - register device with input core
|
| 2291 | * @dev: device to be registered
|
| 2292 | *
|
| 2293 | * This function registers device with input core. The device must be
|
| 2294 | * allocated with input_allocate_device() and all it's capabilities
|
| 2295 | * set up before registering.
|
| 2296 | * If function fails the device must be freed with input_free_device().
|
| 2297 | * Once device has been successfully registered it can be unregistered
|
| 2298 | * with input_unregister_device(); input_free_device() should not be
|
| 2299 | * called in this case.
|
| 2300 | *
|
| 2301 | * Note that this function is also used to register managed input devices
|
| 2302 | * (ones allocated with devm_input_allocate_device()). Such managed input
|
| 2303 | * devices need not be explicitly unregistered or freed, their tear down
|
| 2304 | * is controlled by the devres infrastructure. It is also worth noting
|
| 2305 | * that tear down of managed input devices is internally a 2-step process:
|
| 2306 | * registered managed input device is first unregistered, but stays in
|
| 2307 | * memory and can still handle input_event() calls (although events will
|
| 2308 | * not be delivered anywhere). The freeing of managed input device will
|
| 2309 | * happen later, when devres stack is unwound to the point where device
|
| 2310 | * allocation was made.
|
| 2311 |
|
| 2312 | int input_register_device(struct input_dev *dev)
|
| 2313 | {
|
| 2314 | struct input_devres *devres = NULL;
|
| 2315 | struct input_handler *handler;
|
| 2316 | const char *path;
|
| 2317 | int error;
|
| 2318 |
|
| 2319 | if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
|
| 2320 | dev_err(&dev->dev,
|
| 2321 | "Absolute device without dev->absinfo, refusing to register\n");
|
| 2322 | return -EINVAL;
|
| 2323 | }
|
| 2324 |
|
| 2325 | if (dev->devres_managed) {
|
| 2326 | devres = devres_alloc(devm_input_device_unregister,
|
| 2327 | sizeof(*devres), GFP_KERNEL);
|
| 2328 | if (!devres)
|
| 2329 | return -ENOMEM;
|
| 2330 |
|
| 2331 | devres->input = dev;
|
| 2332 | }
|
| 2333 |
|
| 2334 |
|
| 2335 | __set_bit(EV_SYN, dev->evbit);
|
| 2336 |
|
| 2337 |
|
| 2338 | __clear_bit(KEY_RESERVED, dev->keybit);
|
| 2339 |
|
| 2340 |
|
| 2341 | input_cleanse_bitmasks(dev);
|
| 2342 |
|
| 2343 | error = input_device_tune_vals(dev);
|
| 2344 | if (error)
|
| 2345 | goto err_devres_free;
|
| 2346 |
|
| 2347 | |
| 2348 | * If delay and period are pre-set by the driver, then autorepeating
|
| 2349 | * is handled by the driver itself and we don't do it in input.c.
|
| 2350 |
|
| 2351 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
|
| 2352 | input_enable_softrepeat(dev, 250, 33);
|
| 2353 |
|
| 2354 | if (!dev->getkeycode)
|
| 2355 | dev->getkeycode = input_default_getkeycode;
|
| 2356 |
|
| 2357 | if (!dev->setkeycode)
|
| 2358 | dev->setkeycode = input_default_setkeycode;
|
| 2359 |
|
| 2360 | if (dev->poller)
|
| 2361 | input_dev_poller_finalize(dev->poller);
|
| 2362 |
|
| 2363 | error = device_add(&dev->dev);
|
| 2364 | if (error)
|
| 2365 | goto err_devres_free;
|
| 2366 |
|
| 2367 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
| 2368 | pr_info("%s as %s\n",
|
| 2369 | dev->name ? dev->name : "Unspecified device",
|
| 2370 | path ? path : "N/A");
|
| 2371 | kfree(path);
|
| 2372 |
|
| 2373 | error = -EINTR;
|
| 2374 | scoped_cond_guard(mutex_intr, goto err_device_del, &input_mutex) {
|
| 2375 | list_add_tail(&dev->node, &input_dev_list);
|
| 2376 |
|
| 2377 | list_for_each_entry(handler, &input_handler_list, node)
|
| 2378 | input_attach_handler(dev, handler);
|
| 2379 |
|
| 2380 | input_wakeup_procfs_readers();
|
| 2381 | }
|
| 2382 |
|
| 2383 | if (dev->devres_managed) {
|
| 2384 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
|
| 2385 | __func__, dev_name(&dev->dev));
|
| 2386 | devres_add(dev->dev.parent, devres);
|
| 2387 | }
|
| 2388 | return 0;
|
| 2389 |
|
| 2390 | err_device_del:
|
| 2391 | device_del(&dev->dev);
|
| 2392 | err_devres_free:
|
| 2393 | devres_free(devres);
|
| 2394 | return error;
|
| 2395 | }
|
| 2396 | EXPORT_SYMBOL(input_register_device);
|
| 2397 |
|
| 2398 | |
| 2399 | * input_unregister_device - unregister previously registered device
|
| 2400 | * @dev: device to be unregistered
|
| 2401 | *
|
| 2402 | * This function unregisters an input device. Once device is unregistered
|
| 2403 | * the caller should not try to access it as it may get freed at any moment.
|
| 2404 |
|
| 2405 | void input_unregister_device(struct input_dev *dev)
|
| 2406 | {
|
| 2407 | if (dev->devres_managed) {
|
| 2408 | WARN_ON(devres_destroy(dev->dev.parent,
|
| 2409 | devm_input_device_unregister,
|
| 2410 | devm_input_device_match,
|
| 2411 | dev));
|
| 2412 | __input_unregister_device(dev);
|
| 2413 | |
| 2414 | * We do not do input_put_device() here because it will be done
|
| 2415 | * when 2nd devres fires up.
|
| 2416 |
|
| 2417 | } else {
|
| 2418 | __input_unregister_device(dev);
|
| 2419 | input_put_device(dev);
|
| 2420 | }
|
| 2421 | }
|
| 2422 | EXPORT_SYMBOL(input_unregister_device);
|
| 2423 |
|
| 2424 | static int input_handler_check_methods(const struct input_handler *handler)
|
| 2425 | {
|
| 2426 | int count = 0;
|
| 2427 |
|
| 2428 | if (handler->filter)
|
| 2429 | count++;
|
| 2430 | if (handler->events)
|
| 2431 | count++;
|
| 2432 | if (handler->event)
|
| 2433 | count++;
|
| 2434 |
|
| 2435 | if (count > 1) {
|
| 2436 | pr_err("%s: only one event processing method can be defined (%s)\n",
|
| 2437 | __func__, handler->name);
|
| 2438 | return -EINVAL;
|
| 2439 | }
|
| 2440 |
|
| 2441 | return 0;
|
| 2442 | }
|
| 2443 |
|
| 2444 | |
| 2445 | * input_register_handler - register a new input handler
|
| 2446 | * @handler: handler to be registered
|
| 2447 | *
|
| 2448 | * This function registers a new input handler (interface) for input
|
| 2449 | * devices in the system and attaches it to all input devices that
|
| 2450 | * are compatible with the handler.
|
| 2451 |
|
| 2452 | int input_register_handler(struct input_handler *handler)
|
| 2453 | {
|
| 2454 | struct input_dev *dev;
|
| 2455 | int error;
|
| 2456 |
|
| 2457 | error = input_handler_check_methods(handler);
|
| 2458 | if (error)
|
| 2459 | return error;
|
| 2460 |
|
| 2461 | scoped_cond_guard(mutex_intr, return -EINTR, &input_mutex) {
|
| 2462 | INIT_LIST_HEAD(&handler->h_list);
|
| 2463 |
|
| 2464 | list_add_tail(&handler->node, &input_handler_list);
|
| 2465 |
|
| 2466 | list_for_each_entry(dev, &input_dev_list, node)
|
| 2467 | input_attach_handler(dev, handler);
|
| 2468 |
|
| 2469 | input_wakeup_procfs_readers();
|
| 2470 | }
|
| 2471 |
|
| 2472 | return 0;
|
| 2473 | }
|
| 2474 | EXPORT_SYMBOL(input_register_handler);
|
| 2475 |
|
| 2476 | |
| 2477 | * input_unregister_handler - unregisters an input handler
|
| 2478 | * @handler: handler to be unregistered
|
| 2479 | *
|
| 2480 | * This function disconnects a handler from its input devices and
|
| 2481 | * removes it from lists of known handlers.
|
| 2482 |
|
| 2483 | void input_unregister_handler(struct input_handler *handler)
|
| 2484 | {
|
| 2485 | struct input_handle *handle, *next;
|
| 2486 |
|
| 2487 | guard(mutex)(&input_mutex);
|
| 2488 |
|
| 2489 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
|
| 2490 | handler->disconnect(handle);
|
| 2491 | WARN_ON(!list_empty(&handler->h_list));
|
| 2492 |
|
| 2493 | list_del_init(&handler->node);
|
| 2494 |
|
| 2495 | input_wakeup_procfs_readers();
|
| 2496 | }
|
| 2497 | EXPORT_SYMBOL(input_unregister_handler);
|
| 2498 |
|
| 2499 | |
| 2500 | * input_handler_for_each_handle - handle iterator
|
| 2501 | * @handler: input handler to iterate
|
| 2502 | * @data: data for the callback
|
| 2503 | * @fn: function to be called for each handle
|
| 2504 | *
|
| 2505 | * Iterate over @bus's list of devices, and call @fn for each, passing
|
| 2506 | * it @data and stop when @fn returns a non-zero value. The function is
|
| 2507 | * using RCU to traverse the list and therefore may be using in atomic
|
| 2508 | * contexts. The @fn callback is invoked from RCU critical section and
|
| 2509 | * thus must not sleep.
|
| 2510 |
|
| 2511 | int input_handler_for_each_handle(struct input_handler *handler, void *data,
|
| 2512 | int (*fn)(struct input_handle *, void *))
|
| 2513 | {
|
| 2514 | struct input_handle *handle;
|
| 2515 | int retval;
|
| 2516 |
|
| 2517 | guard(rcu)();
|
| 2518 |
|
| 2519 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
|
| 2520 | retval = fn(handle, data);
|
| 2521 | if (retval)
|
| 2522 | return retval;
|
| 2523 | }
|
| 2524 |
|
| 2525 | return 0;
|
| 2526 | }
|
| 2527 | EXPORT_SYMBOL(input_handler_for_each_handle);
|
| 2528 |
|
| 2529 | |
| 2530 | * An implementation of input_handle's handle_events() method that simply
|
| 2531 | * invokes handler->event() method for each event one by one.
|
| 2532 |
|
| 2533 | static unsigned int input_handle_events_default(struct input_handle *handle,
|
| 2534 | struct input_value *vals,
|
| 2535 | unsigned int count)
|
| 2536 | {
|
| 2537 | struct input_handler *handler = handle->handler;
|
| 2538 | struct input_value *v;
|
| 2539 |
|
| 2540 | for (v = vals; v != vals + count; v++)
|
| 2541 | handler->event(handle, v->type, v->code, v->value);
|
| 2542 |
|
| 2543 | return count;
|
| 2544 | }
|
| 2545 |
|
| 2546 | |
| 2547 | * An implementation of input_handle's handle_events() method that invokes
|
| 2548 | * handler->filter() method for each event one by one and removes events
|
| 2549 | * that were filtered out from the "vals" array.
|
| 2550 |
|
| 2551 | static unsigned int input_handle_events_filter(struct input_handle *handle,
|
| 2552 | struct input_value *vals,
|
| 2553 | unsigned int count)
|
| 2554 | {
|
| 2555 | struct input_handler *handler = handle->handler;
|
| 2556 | struct input_value *end = vals;
|
| 2557 | struct input_value *v;
|
| 2558 |
|
| 2559 | for (v = vals; v != vals + count; v++) {
|
| 2560 | if (handler->filter(handle, v->type, v->code, v->value))
|
| 2561 | continue;
|
| 2562 | if (end != v)
|
| 2563 | *end = *v;
|
| 2564 | end++;
|
| 2565 | }
|
| 2566 |
|
| 2567 | return end - vals;
|
| 2568 | }
|
| 2569 |
|
| 2570 | |
| 2571 | * An implementation of input_handle's handle_events() method that does nothing.
|
| 2572 |
|
| 2573 | static unsigned int input_handle_events_null(struct input_handle *handle,
|
| 2574 | struct input_value *vals,
|
| 2575 | unsigned int count)
|
| 2576 | {
|
| 2577 | return count;
|
| 2578 | }
|
| 2579 |
|
| 2580 | |
| 2581 | * Sets up appropriate handle->event_handler based on the input_handler
|
| 2582 | * associated with the handle.
|
| 2583 |
|
| 2584 | static void input_handle_setup_event_handler(struct input_handle *handle)
|
| 2585 | {
|
| 2586 | struct input_handler *handler = handle->handler;
|
| 2587 |
|
| 2588 | if (handler->filter)
|
| 2589 | handle->handle_events = input_handle_events_filter;
|
| 2590 | else if (handler->event)
|
| 2591 | handle->handle_events = input_handle_events_default;
|
| 2592 | else if (handler->events)
|
| 2593 | handle->handle_events = handler->events;
|
| 2594 | else
|
| 2595 | handle->handle_events = input_handle_events_null;
|
| 2596 | }
|
| 2597 |
|
| 2598 | |
| 2599 | * input_register_handle - register a new input handle
|
| 2600 | * @handle: handle to register
|
| 2601 | *
|
| 2602 | * This function puts a new input handle onto device's
|
| 2603 | * and handler's lists so that events can flow through
|
| 2604 | * it once it is opened using input_open_device().
|
| 2605 | *
|
| 2606 | * This function is supposed to be called from handler's
|
| 2607 | * connect() method.
|
| 2608 |
|
| 2609 | int input_register_handle(struct input_handle *handle)
|
| 2610 | {
|
| 2611 | struct input_handler *handler = handle->handler;
|
| 2612 | struct input_dev *dev = handle->dev;
|
| 2613 |
|
| 2614 | input_handle_setup_event_handler(handle);
|
| 2615 | |
| 2616 | * We take dev->mutex here to prevent race with
|
| 2617 | * input_release_device().
|
| 2618 |
|
| 2619 | scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {
|
| 2620 | |
| 2621 | * Filters go to the head of the list, normal handlers
|
| 2622 | * to the tail.
|
| 2623 |
|
| 2624 | if (handler->filter)
|
| 2625 | list_add_rcu(&handle->d_node, &dev->h_list);
|
| 2626 | else
|
| 2627 | list_add_tail_rcu(&handle->d_node, &dev->h_list);
|
| 2628 | }
|
| 2629 |
|
| 2630 | |
| 2631 | * Since we are supposed to be called from ->connect()
|
| 2632 | * which is mutually exclusive with ->disconnect()
|
| 2633 | * we can't be racing with input_unregister_handle()
|
| 2634 | * and so separate lock is not needed here.
|
| 2635 |
|
| 2636 | list_add_tail_rcu(&handle->h_node, &handler->h_list);
|
| 2637 |
|
| 2638 | if (handler->start)
|
| 2639 | handler->start(handle);
|
| 2640 |
|
| 2641 | return 0;
|
| 2642 | }
|
| 2643 | EXPORT_SYMBOL(input_register_handle);
|
| 2644 |
|
| 2645 | |
| 2646 | * input_unregister_handle - unregister an input handle
|
| 2647 | * @handle: handle to unregister
|
| 2648 | *
|
| 2649 | * This function removes input handle from device's
|
| 2650 | * and handler's lists.
|
| 2651 | *
|
| 2652 | * This function is supposed to be called from handler's
|
| 2653 | * disconnect() method.
|
| 2654 |
|
| 2655 | void input_unregister_handle(struct input_handle *handle)
|
| 2656 | {
|
| 2657 | struct input_dev *dev = handle->dev;
|
| 2658 |
|
| 2659 | list_del_rcu(&handle->h_node);
|
| 2660 |
|
| 2661 | |
| 2662 | * Take dev->mutex to prevent race with input_release_device().
|
| 2663 |
|
| 2664 | scoped_guard(mutex, &dev->mutex)
|
| 2665 | list_del_rcu(&handle->d_node);
|
| 2666 |
|
| 2667 | synchronize_rcu();
|
| 2668 | }
|
| 2669 | EXPORT_SYMBOL(input_unregister_handle);
|
| 2670 |
|
| 2671 | |
| 2672 | * input_get_new_minor - allocates a new input minor number
|
| 2673 | * @legacy_base: beginning or the legacy range to be searched
|
| 2674 | * @legacy_num: size of legacy range
|
| 2675 | * @allow_dynamic: whether we can also take ID from the dynamic range
|
| 2676 | *
|
| 2677 | * This function allocates a new device minor for from input major namespace.
|
| 2678 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num
|
| 2679 | * parameters and whether ID can be allocated from dynamic range if there are
|
| 2680 | * no free IDs in legacy range.
|
| 2681 |
|
| 2682 | int input_get_new_minor(int legacy_base, unsigned int legacy_num,
|
| 2683 | bool allow_dynamic)
|
| 2684 | {
|
| 2685 | |
| 2686 | * This function should be called from input handler's ->connect()
|
| 2687 | * methods, which are serialized with input_mutex, so no additional
|
| 2688 | * locking is needed here.
|
| 2689 |
|
| 2690 | if (legacy_base >= 0) {
|
| 2691 | int minor = ida_alloc_range(&input_ida, legacy_base,
|
| 2692 | legacy_base + legacy_num - 1,
|
| 2693 | GFP_KERNEL);
|
| 2694 | if (minor >= 0 || !allow_dynamic)
|
| 2695 | return minor;
|
| 2696 | }
|
| 2697 |
|
| 2698 | return ida_alloc_range(&input_ida, INPUT_FIRST_DYNAMIC_DEV,
|
| 2699 | INPUT_MAX_CHAR_DEVICES - 1, GFP_KERNEL);
|
| 2700 | }
|
| 2701 | EXPORT_SYMBOL(input_get_new_minor);
|
| 2702 |
|
| 2703 | |
| 2704 | * input_free_minor - release previously allocated minor
|
| 2705 | * @minor: minor to be released
|
| 2706 | *
|
| 2707 | * This function releases previously allocated input minor so that it can be
|
| 2708 | * reused later.
|
| 2709 |
|
| 2710 | void input_free_minor(unsigned int minor)
|
| 2711 | {
|
| 2712 | ida_free(&input_ida, minor);
|
| 2713 | }
|
| 2714 | EXPORT_SYMBOL(input_free_minor);
|
| 2715 |
|
| 2716 | static int __init input_init(void)
|
| 2717 | {
|
| 2718 | int err;
|
| 2719 |
|
| 2720 | err = class_register(&input_class);
|
| 2721 | if (err) {
|
| 2722 | pr_err("unable to register input_dev class\n");
|
| 2723 | return err;
|
| 2724 | }
|
| 2725 |
|
| 2726 | err = input_proc_init();
|
| 2727 | if (err)
|
| 2728 | goto fail1;
|
| 2729 |
|
| 2730 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
|
| 2731 | INPUT_MAX_CHAR_DEVICES, "input");
|
| 2732 | if (err) {
|
| 2733 | pr_err("unable to register char major %d", INPUT_MAJOR);
|
| 2734 | goto fail2;
|
| 2735 | }
|
| 2736 |
|
| 2737 | return 0;
|
| 2738 |
|
| 2739 | fail2: input_proc_exit();
|
| 2740 | fail1: class_unregister(&input_class);
|
| 2741 | return err;
|
| 2742 | }
|
| 2743 |
|
| 2744 | static void __exit input_exit(void)
|
| 2745 | {
|
| 2746 | input_proc_exit();
|
| 2747 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
|
| 2748 | INPUT_MAX_CHAR_DEVICES);
|
| 2749 | class_unregister(&input_class);
|
| 2750 | }
|
| 2751 |
|
| 2752 | subsys_initcall(input_init);
|
| 2753 | module_exit(input_exit);
|