344 lines
8.6 KiB
C
344 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Input layer to RF Kill interface connector
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*
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* Copyright (c) 2007 Dmitry Torokhov
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*
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* If you ever run into a situation in which you have a SW_ type rfkill
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* input device, then you can revive code that was removed in the patch
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* "rfkill-input: remove unused code".
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*/
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/moduleparam.h>
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#include <linux/workqueue.h>
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#include <linux/init.h>
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#include <linux/rfkill.h>
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#include <linux/sched.h>
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#include "rfkill.h"
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enum rfkill_input_master_mode {
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RFKILL_INPUT_MASTER_UNLOCK = 0,
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RFKILL_INPUT_MASTER_RESTORE = 1,
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RFKILL_INPUT_MASTER_UNBLOCKALL = 2,
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NUM_RFKILL_INPUT_MASTER_MODES
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};
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/* Delay (in ms) between consecutive switch ops */
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#define RFKILL_OPS_DELAY 200
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static enum rfkill_input_master_mode rfkill_master_switch_mode =
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RFKILL_INPUT_MASTER_UNBLOCKALL;
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module_param_named(master_switch_mode, rfkill_master_switch_mode, uint, 0);
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MODULE_PARM_DESC(master_switch_mode,
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"SW_RFKILL_ALL ON should: 0=do nothing (only unlock); 1=restore; 2=unblock all");
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static DEFINE_SPINLOCK(rfkill_op_lock);
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static bool rfkill_op_pending;
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static unsigned long rfkill_sw_pending[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
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static unsigned long rfkill_sw_state[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
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enum rfkill_sched_op {
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RFKILL_GLOBAL_OP_EPO = 0,
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RFKILL_GLOBAL_OP_RESTORE,
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RFKILL_GLOBAL_OP_UNLOCK,
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RFKILL_GLOBAL_OP_UNBLOCK,
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};
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static enum rfkill_sched_op rfkill_master_switch_op;
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static enum rfkill_sched_op rfkill_op;
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static void __rfkill_handle_global_op(enum rfkill_sched_op op)
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{
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unsigned int i;
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switch (op) {
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case RFKILL_GLOBAL_OP_EPO:
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rfkill_epo();
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break;
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case RFKILL_GLOBAL_OP_RESTORE:
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rfkill_restore_states();
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break;
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case RFKILL_GLOBAL_OP_UNLOCK:
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rfkill_remove_epo_lock();
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break;
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case RFKILL_GLOBAL_OP_UNBLOCK:
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rfkill_remove_epo_lock();
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for (i = 0; i < NUM_RFKILL_TYPES; i++)
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rfkill_switch_all(i, false);
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break;
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default:
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/* memory corruption or bug, fail safely */
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rfkill_epo();
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WARN(1, "Unknown requested operation %d! "
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"rfkill Emergency Power Off activated\n",
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op);
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}
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}
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static void __rfkill_handle_normal_op(const enum rfkill_type type,
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const bool complement)
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{
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bool blocked;
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blocked = rfkill_get_global_sw_state(type);
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if (complement)
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blocked = !blocked;
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rfkill_switch_all(type, blocked);
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}
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static void rfkill_op_handler(struct work_struct *work)
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{
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unsigned int i;
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bool c;
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spin_lock_irq(&rfkill_op_lock);
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do {
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if (rfkill_op_pending) {
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enum rfkill_sched_op op = rfkill_op;
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rfkill_op_pending = false;
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memset(rfkill_sw_pending, 0,
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sizeof(rfkill_sw_pending));
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spin_unlock_irq(&rfkill_op_lock);
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__rfkill_handle_global_op(op);
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spin_lock_irq(&rfkill_op_lock);
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/*
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* handle global ops first -- during unlocked period
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* we might have gotten a new global op.
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*/
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if (rfkill_op_pending)
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continue;
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}
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if (rfkill_is_epo_lock_active())
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continue;
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for (i = 0; i < NUM_RFKILL_TYPES; i++) {
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if (__test_and_clear_bit(i, rfkill_sw_pending)) {
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c = __test_and_clear_bit(i, rfkill_sw_state);
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spin_unlock_irq(&rfkill_op_lock);
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__rfkill_handle_normal_op(i, c);
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spin_lock_irq(&rfkill_op_lock);
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}
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}
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} while (rfkill_op_pending);
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spin_unlock_irq(&rfkill_op_lock);
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}
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static DECLARE_DELAYED_WORK(rfkill_op_work, rfkill_op_handler);
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static unsigned long rfkill_last_scheduled;
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static unsigned long rfkill_ratelimit(const unsigned long last)
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{
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const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
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return time_after(jiffies, last + delay) ? 0 : delay;
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}
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static void rfkill_schedule_ratelimited(void)
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{
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if (schedule_delayed_work(&rfkill_op_work,
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rfkill_ratelimit(rfkill_last_scheduled)))
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rfkill_last_scheduled = jiffies;
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}
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static void rfkill_schedule_global_op(enum rfkill_sched_op op)
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{
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unsigned long flags;
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spin_lock_irqsave(&rfkill_op_lock, flags);
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rfkill_op = op;
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rfkill_op_pending = true;
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if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
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/* bypass the limiter for EPO */
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mod_delayed_work(system_wq, &rfkill_op_work, 0);
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rfkill_last_scheduled = jiffies;
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} else
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rfkill_schedule_ratelimited();
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spin_unlock_irqrestore(&rfkill_op_lock, flags);
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}
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static void rfkill_schedule_toggle(enum rfkill_type type)
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{
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unsigned long flags;
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if (rfkill_is_epo_lock_active())
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return;
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spin_lock_irqsave(&rfkill_op_lock, flags);
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if (!rfkill_op_pending) {
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__set_bit(type, rfkill_sw_pending);
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__change_bit(type, rfkill_sw_state);
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rfkill_schedule_ratelimited();
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}
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spin_unlock_irqrestore(&rfkill_op_lock, flags);
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}
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static void rfkill_schedule_evsw_rfkillall(int state)
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{
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if (state)
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rfkill_schedule_global_op(rfkill_master_switch_op);
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else
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rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
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}
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static void rfkill_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int data)
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{
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if (type == EV_KEY && data == 1) {
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switch (code) {
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case KEY_WLAN:
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rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
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break;
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case KEY_BLUETOOTH:
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rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
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break;
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case KEY_UWB:
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rfkill_schedule_toggle(RFKILL_TYPE_UWB);
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break;
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case KEY_WIMAX:
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rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
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break;
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case KEY_RFKILL:
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rfkill_schedule_toggle(RFKILL_TYPE_ALL);
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break;
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}
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} else if (type == EV_SW && code == SW_RFKILL_ALL)
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rfkill_schedule_evsw_rfkillall(data);
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}
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static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_handle *handle;
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int error;
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handle = kzalloc(sizeof(struct input_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 = "rfkill";
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/* causes rfkill_start() to be called */
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error = input_register_handle(handle);
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if (error)
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goto err_free_handle;
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error = input_open_device(handle);
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if (error)
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goto err_unregister_handle;
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return 0;
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err_unregister_handle:
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input_unregister_handle(handle);
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err_free_handle:
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kfree(handle);
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return error;
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}
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static void rfkill_start(struct input_handle *handle)
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{
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/*
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* Take event_lock to guard against configuration changes, we
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* should be able to deal with concurrency with rfkill_event()
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* just fine (which event_lock will also avoid).
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*/
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spin_lock_irq(&handle->dev->event_lock);
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if (test_bit(EV_SW, handle->dev->evbit) &&
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test_bit(SW_RFKILL_ALL, handle->dev->swbit))
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rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
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handle->dev->sw));
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spin_unlock_irq(&handle->dev->event_lock);
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}
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static void rfkill_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 rfkill_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_RFKILL)] = BIT_MASK(KEY_RFKILL) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
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.evbit = { BIT(EV_SW) },
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.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
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},
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{ }
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};
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static struct input_handler rfkill_handler = {
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.name = "rfkill",
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.event = rfkill_event,
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.connect = rfkill_connect,
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.start = rfkill_start,
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.disconnect = rfkill_disconnect,
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.id_table = rfkill_ids,
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};
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int __init rfkill_handler_init(void)
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{
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switch (rfkill_master_switch_mode) {
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case RFKILL_INPUT_MASTER_UNBLOCKALL:
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rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
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break;
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case RFKILL_INPUT_MASTER_RESTORE:
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rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
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break;
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case RFKILL_INPUT_MASTER_UNLOCK:
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rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
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break;
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default:
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return -EINVAL;
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}
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/* Avoid delay at first schedule */
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rfkill_last_scheduled =
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jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
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return input_register_handler(&rfkill_handler);
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}
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void __exit rfkill_handler_exit(void)
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{
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input_unregister_handler(&rfkill_handler);
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cancel_delayed_work_sync(&rfkill_op_work);
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}
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