262 lines
6.3 KiB
C
262 lines
6.3 KiB
C
/* drivers/input/keycombo.c
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/input.h>
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#include <linux/keycombo.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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struct keycombo_state {
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struct input_handler input_handler;
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unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
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unsigned long upbit[BITS_TO_LONGS(KEY_CNT)];
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unsigned long key[BITS_TO_LONGS(KEY_CNT)];
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spinlock_t lock;
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struct workqueue_struct *wq;
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int key_down_target;
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int key_down;
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int key_up;
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struct delayed_work key_down_work;
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int delay;
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struct work_struct key_up_work;
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void (*key_up_fn)(void *);
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void (*key_down_fn)(void *);
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void *priv;
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int key_is_down;
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struct wakeup_source combo_held_wake_source;
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struct wakeup_source combo_up_wake_source;
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};
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static void do_key_down(struct work_struct *work)
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{
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struct delayed_work *dwork = container_of(work, struct delayed_work,
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work);
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struct keycombo_state *state = container_of(dwork,
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struct keycombo_state, key_down_work);
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if (state->key_down_fn)
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state->key_down_fn(state->priv);
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}
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static void do_key_up(struct work_struct *work)
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{
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struct keycombo_state *state = container_of(work, struct keycombo_state,
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key_up_work);
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if (state->key_up_fn)
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state->key_up_fn(state->priv);
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__pm_relax(&state->combo_up_wake_source);
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}
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static void keycombo_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int value)
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{
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unsigned long flags;
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struct keycombo_state *state = handle->private;
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if (type != EV_KEY)
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return;
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if (code >= KEY_MAX)
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return;
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if (!test_bit(code, state->keybit))
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return;
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spin_lock_irqsave(&state->lock, flags);
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if (!test_bit(code, state->key) == !value)
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goto done;
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__change_bit(code, state->key);
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if (test_bit(code, state->upbit)) {
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if (value)
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state->key_up++;
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else
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state->key_up--;
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} else {
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if (value)
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state->key_down++;
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else
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state->key_down--;
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}
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if (state->key_down == state->key_down_target && state->key_up == 0) {
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__pm_stay_awake(&state->combo_held_wake_source);
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state->key_is_down = 1;
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if (queue_delayed_work(state->wq, &state->key_down_work,
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state->delay))
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pr_debug("Key down work already queued!");
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} else if (state->key_is_down) {
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if (!cancel_delayed_work(&state->key_down_work)) {
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__pm_stay_awake(&state->combo_up_wake_source);
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queue_work(state->wq, &state->key_up_work);
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}
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__pm_relax(&state->combo_held_wake_source);
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state->key_is_down = 0;
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}
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done:
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spin_unlock_irqrestore(&state->lock, flags);
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}
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static int keycombo_connect(struct input_handler *handler,
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struct input_dev *dev,
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const struct input_device_id *id)
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{
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int i;
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int ret;
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struct input_handle *handle;
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struct keycombo_state *state =
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container_of(handler, struct keycombo_state, input_handler);
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for (i = 0; i < KEY_MAX; i++) {
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if (test_bit(i, state->keybit) && test_bit(i, dev->keybit))
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break;
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}
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if (i == KEY_MAX)
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return -ENODEV;
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handle = kzalloc(sizeof(*handle), GFP_KERNEL);
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if (!handle)
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return -ENOMEM;
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handle->dev = dev;
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handle->handler = handler;
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handle->name = KEYCOMBO_NAME;
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handle->private = state;
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ret = input_register_handle(handle);
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if (ret)
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goto err_input_register_handle;
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ret = input_open_device(handle);
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if (ret)
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goto err_input_open_device;
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return 0;
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err_input_open_device:
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input_unregister_handle(handle);
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err_input_register_handle:
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kfree(handle);
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return ret;
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}
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static void keycombo_disconnect(struct input_handle *handle)
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{
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(handle);
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}
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static const struct input_device_id keycombo_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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},
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{ },
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};
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MODULE_DEVICE_TABLE(input, keycombo_ids);
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static int keycombo_probe(struct platform_device *pdev)
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{
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int ret;
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int key, *keyp;
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struct keycombo_state *state;
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struct keycombo_platform_data *pdata = pdev->dev.platform_data;
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if (!pdata)
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return -EINVAL;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return -ENOMEM;
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spin_lock_init(&state->lock);
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keyp = pdata->keys_down;
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while ((key = *keyp++)) {
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if (key >= KEY_MAX)
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continue;
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state->key_down_target++;
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__set_bit(key, state->keybit);
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}
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if (pdata->keys_up) {
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keyp = pdata->keys_up;
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while ((key = *keyp++)) {
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if (key >= KEY_MAX)
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continue;
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__set_bit(key, state->keybit);
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__set_bit(key, state->upbit);
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}
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}
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state->wq = alloc_ordered_workqueue("keycombo", 0);
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if (!state->wq)
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return -ENOMEM;
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state->priv = pdata->priv;
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if (pdata->key_down_fn)
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state->key_down_fn = pdata->key_down_fn;
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INIT_DELAYED_WORK(&state->key_down_work, do_key_down);
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if (pdata->key_up_fn)
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state->key_up_fn = pdata->key_up_fn;
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INIT_WORK(&state->key_up_work, do_key_up);
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wakeup_source_init(&state->combo_held_wake_source, "key combo");
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wakeup_source_init(&state->combo_up_wake_source, "key combo up");
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state->delay = msecs_to_jiffies(pdata->key_down_delay);
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state->input_handler.event = keycombo_event;
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state->input_handler.connect = keycombo_connect;
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state->input_handler.disconnect = keycombo_disconnect;
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state->input_handler.name = KEYCOMBO_NAME;
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state->input_handler.id_table = keycombo_ids;
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ret = input_register_handler(&state->input_handler);
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if (ret) {
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kfree(state);
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return ret;
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}
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platform_set_drvdata(pdev, state);
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return 0;
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}
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int keycombo_remove(struct platform_device *pdev)
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{
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struct keycombo_state *state = platform_get_drvdata(pdev);
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input_unregister_handler(&state->input_handler);
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destroy_workqueue(state->wq);
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kfree(state);
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return 0;
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}
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struct platform_driver keycombo_driver = {
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.driver.name = KEYCOMBO_NAME,
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.probe = keycombo_probe,
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.remove = keycombo_remove,
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};
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static int __init keycombo_init(void)
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{
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return platform_driver_register(&keycombo_driver);
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}
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static void __exit keycombo_exit(void)
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{
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return platform_driver_unregister(&keycombo_driver);
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}
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module_init(keycombo_init);
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module_exit(keycombo_exit);
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