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