![Julia Lawall](/assets/img/avatar_default.png)
The list_for_each_entry loop can fail, in which case the list element is not removed from the list rfkill_fds. Since this list is not accessed by the loop, the addition of &data->list into the list is just moved after the loop. The sematic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression E,E1,E2; identifier l; @@ *list_add(&E->l,E1); ... when != E1 when != list_del(&E->l) when != list_del_init(&E->l) when != E = E2 *kfree(E);// </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1280 lines
29 KiB
C
1280 lines
29 KiB
C
/*
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* Copyright (C) 2006 - 2007 Ivo van Doorn
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/workqueue.h>
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#include <linux/capability.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rfkill.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/miscdevice.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include "rfkill.h"
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#define POLL_INTERVAL (5 * HZ)
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#define RFKILL_BLOCK_HW BIT(0)
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#define RFKILL_BLOCK_SW BIT(1)
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#define RFKILL_BLOCK_SW_PREV BIT(2)
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#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
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RFKILL_BLOCK_SW |\
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RFKILL_BLOCK_SW_PREV)
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#define RFKILL_BLOCK_SW_SETCALL BIT(31)
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struct rfkill {
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spinlock_t lock;
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const char *name;
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enum rfkill_type type;
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unsigned long state;
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u32 idx;
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bool registered;
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bool persistent;
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const struct rfkill_ops *ops;
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void *data;
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#ifdef CONFIG_RFKILL_LEDS
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struct led_trigger led_trigger;
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const char *ledtrigname;
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#endif
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struct device dev;
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struct list_head node;
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struct delayed_work poll_work;
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struct work_struct uevent_work;
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struct work_struct sync_work;
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};
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#define to_rfkill(d) container_of(d, struct rfkill, dev)
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struct rfkill_int_event {
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struct list_head list;
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struct rfkill_event ev;
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};
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struct rfkill_data {
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struct list_head list;
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struct list_head events;
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struct mutex mtx;
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wait_queue_head_t read_wait;
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bool input_handler;
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};
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MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
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MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
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MODULE_DESCRIPTION("RF switch support");
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MODULE_LICENSE("GPL");
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/*
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* The locking here should be made much smarter, we currently have
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* a bit of a stupid situation because drivers might want to register
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* the rfkill struct under their own lock, and take this lock during
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* rfkill method calls -- which will cause an AB-BA deadlock situation.
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*
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* To fix that, we need to rework this code here to be mostly lock-free
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* and only use the mutex for list manipulations, not to protect the
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* various other global variables. Then we can avoid holding the mutex
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* around driver operations, and all is happy.
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*/
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static LIST_HEAD(rfkill_list); /* list of registered rf switches */
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static DEFINE_MUTEX(rfkill_global_mutex);
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static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
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static unsigned int rfkill_default_state = 1;
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module_param_named(default_state, rfkill_default_state, uint, 0444);
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MODULE_PARM_DESC(default_state,
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"Default initial state for all radio types, 0 = radio off");
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static struct {
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bool cur, sav;
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} rfkill_global_states[NUM_RFKILL_TYPES];
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static bool rfkill_epo_lock_active;
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#ifdef CONFIG_RFKILL_LEDS
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static void rfkill_led_trigger_event(struct rfkill *rfkill)
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{
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struct led_trigger *trigger;
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if (!rfkill->registered)
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return;
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trigger = &rfkill->led_trigger;
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if (rfkill->state & RFKILL_BLOCK_ANY)
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led_trigger_event(trigger, LED_OFF);
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else
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led_trigger_event(trigger, LED_FULL);
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}
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static void rfkill_led_trigger_activate(struct led_classdev *led)
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{
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struct rfkill *rfkill;
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rfkill = container_of(led->trigger, struct rfkill, led_trigger);
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rfkill_led_trigger_event(rfkill);
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}
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static int rfkill_led_trigger_register(struct rfkill *rfkill)
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{
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rfkill->led_trigger.name = rfkill->ledtrigname
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? : dev_name(&rfkill->dev);
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rfkill->led_trigger.activate = rfkill_led_trigger_activate;
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return led_trigger_register(&rfkill->led_trigger);
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}
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static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
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{
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led_trigger_unregister(&rfkill->led_trigger);
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}
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#else
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static void rfkill_led_trigger_event(struct rfkill *rfkill)
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{
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}
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static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
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{
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return 0;
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}
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static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
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{
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}
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#endif /* CONFIG_RFKILL_LEDS */
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static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
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enum rfkill_operation op)
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{
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unsigned long flags;
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ev->idx = rfkill->idx;
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ev->type = rfkill->type;
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ev->op = op;
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spin_lock_irqsave(&rfkill->lock, flags);
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ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
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ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
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RFKILL_BLOCK_SW_PREV));
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spin_unlock_irqrestore(&rfkill->lock, flags);
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}
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static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
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{
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struct rfkill_data *data;
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struct rfkill_int_event *ev;
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list_for_each_entry(data, &rfkill_fds, list) {
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ev = kzalloc(sizeof(*ev), GFP_KERNEL);
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if (!ev)
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continue;
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rfkill_fill_event(&ev->ev, rfkill, op);
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mutex_lock(&data->mtx);
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list_add_tail(&ev->list, &data->events);
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mutex_unlock(&data->mtx);
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wake_up_interruptible(&data->read_wait);
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}
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}
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static void rfkill_event(struct rfkill *rfkill)
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{
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if (!rfkill->registered)
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return;
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kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
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/* also send event to /dev/rfkill */
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rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
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}
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static bool __rfkill_set_hw_state(struct rfkill *rfkill,
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bool blocked, bool *change)
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{
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unsigned long flags;
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bool prev, any;
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BUG_ON(!rfkill);
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spin_lock_irqsave(&rfkill->lock, flags);
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prev = !!(rfkill->state & RFKILL_BLOCK_HW);
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if (blocked)
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rfkill->state |= RFKILL_BLOCK_HW;
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else
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rfkill->state &= ~RFKILL_BLOCK_HW;
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*change = prev != blocked;
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any = rfkill->state & RFKILL_BLOCK_ANY;
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spin_unlock_irqrestore(&rfkill->lock, flags);
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rfkill_led_trigger_event(rfkill);
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return any;
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}
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/**
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* rfkill_set_block - wrapper for set_block method
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*
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* @rfkill: the rfkill struct to use
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* @blocked: the new software state
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*
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* Calls the set_block method (when applicable) and handles notifications
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* etc. as well.
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*/
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static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
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{
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unsigned long flags;
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int err;
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if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
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return;
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/*
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* Some platforms (...!) generate input events which affect the
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* _hard_ kill state -- whenever something tries to change the
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* current software state query the hardware state too.
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*/
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if (rfkill->ops->query)
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rfkill->ops->query(rfkill, rfkill->data);
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spin_lock_irqsave(&rfkill->lock, flags);
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if (rfkill->state & RFKILL_BLOCK_SW)
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rfkill->state |= RFKILL_BLOCK_SW_PREV;
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else
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rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
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if (blocked)
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rfkill->state |= RFKILL_BLOCK_SW;
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else
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rfkill->state &= ~RFKILL_BLOCK_SW;
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rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
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spin_unlock_irqrestore(&rfkill->lock, flags);
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err = rfkill->ops->set_block(rfkill->data, blocked);
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spin_lock_irqsave(&rfkill->lock, flags);
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if (err) {
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/*
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* Failed -- reset status to _prev, this may be different
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* from what set set _PREV to earlier in this function
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* if rfkill_set_sw_state was invoked.
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*/
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if (rfkill->state & RFKILL_BLOCK_SW_PREV)
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rfkill->state |= RFKILL_BLOCK_SW;
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else
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rfkill->state &= ~RFKILL_BLOCK_SW;
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}
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rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
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rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
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spin_unlock_irqrestore(&rfkill->lock, flags);
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rfkill_led_trigger_event(rfkill);
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rfkill_event(rfkill);
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}
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#ifdef CONFIG_RFKILL_INPUT
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static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
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/**
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* __rfkill_switch_all - Toggle state of all switches of given type
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* @type: type of interfaces to be affected
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* @state: the new state
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*
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* This function sets the state of all switches of given type,
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* unless a specific switch is claimed by userspace (in which case,
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* that switch is left alone) or suspended.
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*
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* Caller must have acquired rfkill_global_mutex.
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*/
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static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
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{
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struct rfkill *rfkill;
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rfkill_global_states[type].cur = blocked;
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list_for_each_entry(rfkill, &rfkill_list, node) {
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if (rfkill->type != type)
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continue;
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rfkill_set_block(rfkill, blocked);
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}
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}
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/**
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* rfkill_switch_all - Toggle state of all switches of given type
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* @type: type of interfaces to be affected
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* @state: the new state
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*
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* Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
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* Please refer to __rfkill_switch_all() for details.
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*
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* Does nothing if the EPO lock is active.
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*/
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void rfkill_switch_all(enum rfkill_type type, bool blocked)
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{
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if (atomic_read(&rfkill_input_disabled))
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return;
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mutex_lock(&rfkill_global_mutex);
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if (!rfkill_epo_lock_active)
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__rfkill_switch_all(type, blocked);
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mutex_unlock(&rfkill_global_mutex);
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}
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/**
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* rfkill_epo - emergency power off all transmitters
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*
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* This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
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* ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
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*
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* The global state before the EPO is saved and can be restored later
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* using rfkill_restore_states().
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*/
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void rfkill_epo(void)
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{
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struct rfkill *rfkill;
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int i;
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if (atomic_read(&rfkill_input_disabled))
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return;
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mutex_lock(&rfkill_global_mutex);
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rfkill_epo_lock_active = true;
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list_for_each_entry(rfkill, &rfkill_list, node)
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rfkill_set_block(rfkill, true);
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for (i = 0; i < NUM_RFKILL_TYPES; i++) {
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rfkill_global_states[i].sav = rfkill_global_states[i].cur;
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rfkill_global_states[i].cur = true;
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}
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mutex_unlock(&rfkill_global_mutex);
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}
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/**
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* rfkill_restore_states - restore global states
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*
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* Restore (and sync switches to) the global state from the
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* states in rfkill_default_states. This can undo the effects of
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* a call to rfkill_epo().
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*/
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void rfkill_restore_states(void)
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{
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int i;
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if (atomic_read(&rfkill_input_disabled))
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return;
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mutex_lock(&rfkill_global_mutex);
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rfkill_epo_lock_active = false;
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for (i = 0; i < NUM_RFKILL_TYPES; i++)
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__rfkill_switch_all(i, rfkill_global_states[i].sav);
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mutex_unlock(&rfkill_global_mutex);
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}
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/**
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* rfkill_remove_epo_lock - unlock state changes
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*
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* Used by rfkill-input manually unlock state changes, when
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* the EPO switch is deactivated.
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*/
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void rfkill_remove_epo_lock(void)
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{
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if (atomic_read(&rfkill_input_disabled))
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return;
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mutex_lock(&rfkill_global_mutex);
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rfkill_epo_lock_active = false;
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mutex_unlock(&rfkill_global_mutex);
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}
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/**
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* rfkill_is_epo_lock_active - returns true EPO is active
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*
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* Returns 0 (false) if there is NOT an active EPO contidion,
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* and 1 (true) if there is an active EPO contition, which
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* locks all radios in one of the BLOCKED states.
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*
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* Can be called in atomic context.
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*/
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bool rfkill_is_epo_lock_active(void)
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{
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return rfkill_epo_lock_active;
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}
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/**
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* rfkill_get_global_sw_state - returns global state for a type
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* @type: the type to get the global state of
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*
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* Returns the current global state for a given wireless
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* device type.
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*/
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bool rfkill_get_global_sw_state(const enum rfkill_type type)
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{
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return rfkill_global_states[type].cur;
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}
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#endif
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bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
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{
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bool ret, change;
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ret = __rfkill_set_hw_state(rfkill, blocked, &change);
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if (!rfkill->registered)
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return ret;
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if (change)
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schedule_work(&rfkill->uevent_work);
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return ret;
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}
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EXPORT_SYMBOL(rfkill_set_hw_state);
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static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
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{
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u32 bit = RFKILL_BLOCK_SW;
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/* if in a ops->set_block right now, use other bit */
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if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
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bit = RFKILL_BLOCK_SW_PREV;
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if (blocked)
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rfkill->state |= bit;
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else
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rfkill->state &= ~bit;
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}
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bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
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{
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unsigned long flags;
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bool prev, hwblock;
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BUG_ON(!rfkill);
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spin_lock_irqsave(&rfkill->lock, flags);
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prev = !!(rfkill->state & RFKILL_BLOCK_SW);
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__rfkill_set_sw_state(rfkill, blocked);
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hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
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blocked = blocked || hwblock;
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spin_unlock_irqrestore(&rfkill->lock, flags);
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if (!rfkill->registered)
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return blocked;
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if (prev != blocked && !hwblock)
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schedule_work(&rfkill->uevent_work);
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rfkill_led_trigger_event(rfkill);
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return blocked;
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}
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EXPORT_SYMBOL(rfkill_set_sw_state);
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void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
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{
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unsigned long flags;
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BUG_ON(!rfkill);
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BUG_ON(rfkill->registered);
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spin_lock_irqsave(&rfkill->lock, flags);
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__rfkill_set_sw_state(rfkill, blocked);
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rfkill->persistent = true;
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spin_unlock_irqrestore(&rfkill->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_init_sw_state);
|
|
|
|
void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
|
|
{
|
|
unsigned long flags;
|
|
bool swprev, hwprev;
|
|
|
|
BUG_ON(!rfkill);
|
|
|
|
spin_lock_irqsave(&rfkill->lock, flags);
|
|
|
|
/*
|
|
* No need to care about prev/setblock ... this is for uevent only
|
|
* and that will get triggered by rfkill_set_block anyway.
|
|
*/
|
|
swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
|
|
hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
|
|
__rfkill_set_sw_state(rfkill, sw);
|
|
if (hw)
|
|
rfkill->state |= RFKILL_BLOCK_HW;
|
|
else
|
|
rfkill->state &= ~RFKILL_BLOCK_HW;
|
|
|
|
spin_unlock_irqrestore(&rfkill->lock, flags);
|
|
|
|
if (!rfkill->registered) {
|
|
rfkill->persistent = true;
|
|
} else {
|
|
if (swprev != sw || hwprev != hw)
|
|
schedule_work(&rfkill->uevent_work);
|
|
|
|
rfkill_led_trigger_event(rfkill);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(rfkill_set_states);
|
|
|
|
static ssize_t rfkill_name_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%s\n", rfkill->name);
|
|
}
|
|
|
|
static const char *rfkill_get_type_str(enum rfkill_type type)
|
|
{
|
|
BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_FM + 1);
|
|
|
|
switch (type) {
|
|
case RFKILL_TYPE_WLAN:
|
|
return "wlan";
|
|
case RFKILL_TYPE_BLUETOOTH:
|
|
return "bluetooth";
|
|
case RFKILL_TYPE_UWB:
|
|
return "ultrawideband";
|
|
case RFKILL_TYPE_WIMAX:
|
|
return "wimax";
|
|
case RFKILL_TYPE_WWAN:
|
|
return "wwan";
|
|
case RFKILL_TYPE_GPS:
|
|
return "gps";
|
|
case RFKILL_TYPE_FM:
|
|
return "fm";
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static ssize_t rfkill_type_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
|
|
}
|
|
|
|
static ssize_t rfkill_idx_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%d\n", rfkill->idx);
|
|
}
|
|
|
|
static ssize_t rfkill_persistent_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%d\n", rfkill->persistent);
|
|
}
|
|
|
|
static ssize_t rfkill_hard_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
|
|
}
|
|
|
|
static ssize_t rfkill_soft_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
|
|
}
|
|
|
|
static ssize_t rfkill_soft_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
unsigned long state;
|
|
int err;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
err = strict_strtoul(buf, 0, &state);
|
|
if (err)
|
|
return err;
|
|
|
|
if (state > 1 )
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
rfkill_set_block(rfkill, state);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
|
|
return err ?: count;
|
|
}
|
|
|
|
static u8 user_state_from_blocked(unsigned long state)
|
|
{
|
|
if (state & RFKILL_BLOCK_HW)
|
|
return RFKILL_USER_STATE_HARD_BLOCKED;
|
|
if (state & RFKILL_BLOCK_SW)
|
|
return RFKILL_USER_STATE_SOFT_BLOCKED;
|
|
|
|
return RFKILL_USER_STATE_UNBLOCKED;
|
|
}
|
|
|
|
static ssize_t rfkill_state_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
|
|
}
|
|
|
|
static ssize_t rfkill_state_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
unsigned long state;
|
|
int err;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
err = strict_strtoul(buf, 0, &state);
|
|
if (err)
|
|
return err;
|
|
|
|
if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
|
|
state != RFKILL_USER_STATE_UNBLOCKED)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
|
|
return err ?: count;
|
|
}
|
|
|
|
static ssize_t rfkill_claim_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", 0);
|
|
}
|
|
|
|
static ssize_t rfkill_claim_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static struct device_attribute rfkill_dev_attrs[] = {
|
|
__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
|
|
__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
|
|
__ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
|
|
__ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
|
|
__ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
|
|
__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
|
|
__ATTR(soft, S_IRUGO|S_IWUSR, rfkill_soft_show, rfkill_soft_store),
|
|
__ATTR(hard, S_IRUGO, rfkill_hard_show, NULL),
|
|
__ATTR_NULL
|
|
};
|
|
|
|
static void rfkill_release(struct device *dev)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
kfree(rfkill);
|
|
}
|
|
|
|
static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
unsigned long flags;
|
|
u32 state;
|
|
int error;
|
|
|
|
error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
|
|
if (error)
|
|
return error;
|
|
error = add_uevent_var(env, "RFKILL_TYPE=%s",
|
|
rfkill_get_type_str(rfkill->type));
|
|
if (error)
|
|
return error;
|
|
spin_lock_irqsave(&rfkill->lock, flags);
|
|
state = rfkill->state;
|
|
spin_unlock_irqrestore(&rfkill->lock, flags);
|
|
error = add_uevent_var(env, "RFKILL_STATE=%d",
|
|
user_state_from_blocked(state));
|
|
return error;
|
|
}
|
|
|
|
void rfkill_pause_polling(struct rfkill *rfkill)
|
|
{
|
|
BUG_ON(!rfkill);
|
|
|
|
if (!rfkill->ops->poll)
|
|
return;
|
|
|
|
cancel_delayed_work_sync(&rfkill->poll_work);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_pause_polling);
|
|
|
|
void rfkill_resume_polling(struct rfkill *rfkill)
|
|
{
|
|
BUG_ON(!rfkill);
|
|
|
|
if (!rfkill->ops->poll)
|
|
return;
|
|
|
|
schedule_work(&rfkill->poll_work.work);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_resume_polling);
|
|
|
|
static int rfkill_suspend(struct device *dev, pm_message_t state)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
|
|
rfkill_pause_polling(rfkill);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rfkill_resume(struct device *dev)
|
|
{
|
|
struct rfkill *rfkill = to_rfkill(dev);
|
|
bool cur;
|
|
|
|
if (!rfkill->persistent) {
|
|
cur = !!(rfkill->state & RFKILL_BLOCK_SW);
|
|
rfkill_set_block(rfkill, cur);
|
|
}
|
|
|
|
rfkill_resume_polling(rfkill);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct class rfkill_class = {
|
|
.name = "rfkill",
|
|
.dev_release = rfkill_release,
|
|
.dev_attrs = rfkill_dev_attrs,
|
|
.dev_uevent = rfkill_dev_uevent,
|
|
.suspend = rfkill_suspend,
|
|
.resume = rfkill_resume,
|
|
};
|
|
|
|
bool rfkill_blocked(struct rfkill *rfkill)
|
|
{
|
|
unsigned long flags;
|
|
u32 state;
|
|
|
|
spin_lock_irqsave(&rfkill->lock, flags);
|
|
state = rfkill->state;
|
|
spin_unlock_irqrestore(&rfkill->lock, flags);
|
|
|
|
return !!(state & RFKILL_BLOCK_ANY);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_blocked);
|
|
|
|
|
|
struct rfkill * __must_check rfkill_alloc(const char *name,
|
|
struct device *parent,
|
|
const enum rfkill_type type,
|
|
const struct rfkill_ops *ops,
|
|
void *ops_data)
|
|
{
|
|
struct rfkill *rfkill;
|
|
struct device *dev;
|
|
|
|
if (WARN_ON(!ops))
|
|
return NULL;
|
|
|
|
if (WARN_ON(!ops->set_block))
|
|
return NULL;
|
|
|
|
if (WARN_ON(!name))
|
|
return NULL;
|
|
|
|
if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
|
|
return NULL;
|
|
|
|
rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
|
|
if (!rfkill)
|
|
return NULL;
|
|
|
|
spin_lock_init(&rfkill->lock);
|
|
INIT_LIST_HEAD(&rfkill->node);
|
|
rfkill->type = type;
|
|
rfkill->name = name;
|
|
rfkill->ops = ops;
|
|
rfkill->data = ops_data;
|
|
|
|
dev = &rfkill->dev;
|
|
dev->class = &rfkill_class;
|
|
dev->parent = parent;
|
|
device_initialize(dev);
|
|
|
|
return rfkill;
|
|
}
|
|
EXPORT_SYMBOL(rfkill_alloc);
|
|
|
|
static void rfkill_poll(struct work_struct *work)
|
|
{
|
|
struct rfkill *rfkill;
|
|
|
|
rfkill = container_of(work, struct rfkill, poll_work.work);
|
|
|
|
/*
|
|
* Poll hardware state -- driver will use one of the
|
|
* rfkill_set{,_hw,_sw}_state functions and use its
|
|
* return value to update the current status.
|
|
*/
|
|
rfkill->ops->poll(rfkill, rfkill->data);
|
|
|
|
schedule_delayed_work(&rfkill->poll_work,
|
|
round_jiffies_relative(POLL_INTERVAL));
|
|
}
|
|
|
|
static void rfkill_uevent_work(struct work_struct *work)
|
|
{
|
|
struct rfkill *rfkill;
|
|
|
|
rfkill = container_of(work, struct rfkill, uevent_work);
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
rfkill_event(rfkill);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
}
|
|
|
|
static void rfkill_sync_work(struct work_struct *work)
|
|
{
|
|
struct rfkill *rfkill;
|
|
bool cur;
|
|
|
|
rfkill = container_of(work, struct rfkill, sync_work);
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
cur = rfkill_global_states[rfkill->type].cur;
|
|
rfkill_set_block(rfkill, cur);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
}
|
|
|
|
int __must_check rfkill_register(struct rfkill *rfkill)
|
|
{
|
|
static unsigned long rfkill_no;
|
|
struct device *dev = &rfkill->dev;
|
|
int error;
|
|
|
|
BUG_ON(!rfkill);
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
|
|
if (rfkill->registered) {
|
|
error = -EALREADY;
|
|
goto unlock;
|
|
}
|
|
|
|
rfkill->idx = rfkill_no;
|
|
dev_set_name(dev, "rfkill%lu", rfkill_no);
|
|
rfkill_no++;
|
|
|
|
list_add_tail(&rfkill->node, &rfkill_list);
|
|
|
|
error = device_add(dev);
|
|
if (error)
|
|
goto remove;
|
|
|
|
error = rfkill_led_trigger_register(rfkill);
|
|
if (error)
|
|
goto devdel;
|
|
|
|
rfkill->registered = true;
|
|
|
|
INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
|
|
INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
|
|
INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
|
|
|
|
if (rfkill->ops->poll)
|
|
schedule_delayed_work(&rfkill->poll_work,
|
|
round_jiffies_relative(POLL_INTERVAL));
|
|
|
|
if (!rfkill->persistent || rfkill_epo_lock_active) {
|
|
schedule_work(&rfkill->sync_work);
|
|
} else {
|
|
#ifdef CONFIG_RFKILL_INPUT
|
|
bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
|
|
|
|
if (!atomic_read(&rfkill_input_disabled))
|
|
__rfkill_switch_all(rfkill->type, soft_blocked);
|
|
#endif
|
|
}
|
|
|
|
rfkill_send_events(rfkill, RFKILL_OP_ADD);
|
|
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
return 0;
|
|
|
|
devdel:
|
|
device_del(&rfkill->dev);
|
|
remove:
|
|
list_del_init(&rfkill->node);
|
|
unlock:
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(rfkill_register);
|
|
|
|
void rfkill_unregister(struct rfkill *rfkill)
|
|
{
|
|
BUG_ON(!rfkill);
|
|
|
|
if (rfkill->ops->poll)
|
|
cancel_delayed_work_sync(&rfkill->poll_work);
|
|
|
|
cancel_work_sync(&rfkill->uevent_work);
|
|
cancel_work_sync(&rfkill->sync_work);
|
|
|
|
rfkill->registered = false;
|
|
|
|
device_del(&rfkill->dev);
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
rfkill_send_events(rfkill, RFKILL_OP_DEL);
|
|
list_del_init(&rfkill->node);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
|
|
rfkill_led_trigger_unregister(rfkill);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_unregister);
|
|
|
|
void rfkill_destroy(struct rfkill *rfkill)
|
|
{
|
|
if (rfkill)
|
|
put_device(&rfkill->dev);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_destroy);
|
|
|
|
static int rfkill_fop_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct rfkill_data *data;
|
|
struct rfkill *rfkill;
|
|
struct rfkill_int_event *ev, *tmp;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&data->events);
|
|
mutex_init(&data->mtx);
|
|
init_waitqueue_head(&data->read_wait);
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
mutex_lock(&data->mtx);
|
|
/*
|
|
* start getting events from elsewhere but hold mtx to get
|
|
* startup events added first
|
|
*/
|
|
|
|
list_for_each_entry(rfkill, &rfkill_list, node) {
|
|
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
|
|
if (!ev)
|
|
goto free;
|
|
rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
|
|
list_add_tail(&ev->list, &data->events);
|
|
}
|
|
list_add(&data->list, &rfkill_fds);
|
|
mutex_unlock(&data->mtx);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
|
|
file->private_data = data;
|
|
|
|
return nonseekable_open(inode, file);
|
|
|
|
free:
|
|
mutex_unlock(&data->mtx);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
mutex_destroy(&data->mtx);
|
|
list_for_each_entry_safe(ev, tmp, &data->events, list)
|
|
kfree(ev);
|
|
kfree(data);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct rfkill_data *data = file->private_data;
|
|
unsigned int res = POLLOUT | POLLWRNORM;
|
|
|
|
poll_wait(file, &data->read_wait, wait);
|
|
|
|
mutex_lock(&data->mtx);
|
|
if (!list_empty(&data->events))
|
|
res = POLLIN | POLLRDNORM;
|
|
mutex_unlock(&data->mtx);
|
|
|
|
return res;
|
|
}
|
|
|
|
static bool rfkill_readable(struct rfkill_data *data)
|
|
{
|
|
bool r;
|
|
|
|
mutex_lock(&data->mtx);
|
|
r = !list_empty(&data->events);
|
|
mutex_unlock(&data->mtx);
|
|
|
|
return r;
|
|
}
|
|
|
|
static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *pos)
|
|
{
|
|
struct rfkill_data *data = file->private_data;
|
|
struct rfkill_int_event *ev;
|
|
unsigned long sz;
|
|
int ret;
|
|
|
|
mutex_lock(&data->mtx);
|
|
|
|
while (list_empty(&data->events)) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
mutex_unlock(&data->mtx);
|
|
ret = wait_event_interruptible(data->read_wait,
|
|
rfkill_readable(data));
|
|
mutex_lock(&data->mtx);
|
|
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ev = list_first_entry(&data->events, struct rfkill_int_event,
|
|
list);
|
|
|
|
sz = min_t(unsigned long, sizeof(ev->ev), count);
|
|
ret = sz;
|
|
if (copy_to_user(buf, &ev->ev, sz))
|
|
ret = -EFAULT;
|
|
|
|
list_del(&ev->list);
|
|
kfree(ev);
|
|
out:
|
|
mutex_unlock(&data->mtx);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *pos)
|
|
{
|
|
struct rfkill *rfkill;
|
|
struct rfkill_event ev;
|
|
|
|
/* we don't need the 'hard' variable but accept it */
|
|
if (count < RFKILL_EVENT_SIZE_V1 - 1)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Copy as much data as we can accept into our 'ev' buffer,
|
|
* but tell userspace how much we've copied so it can determine
|
|
* our API version even in a write() call, if it cares.
|
|
*/
|
|
count = min(count, sizeof(ev));
|
|
if (copy_from_user(&ev, buf, count))
|
|
return -EFAULT;
|
|
|
|
if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
|
|
return -EINVAL;
|
|
|
|
if (ev.type >= NUM_RFKILL_TYPES)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
|
|
if (ev.op == RFKILL_OP_CHANGE_ALL) {
|
|
if (ev.type == RFKILL_TYPE_ALL) {
|
|
enum rfkill_type i;
|
|
for (i = 0; i < NUM_RFKILL_TYPES; i++)
|
|
rfkill_global_states[i].cur = ev.soft;
|
|
} else {
|
|
rfkill_global_states[ev.type].cur = ev.soft;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(rfkill, &rfkill_list, node) {
|
|
if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
|
|
continue;
|
|
|
|
if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
|
|
continue;
|
|
|
|
rfkill_set_block(rfkill, ev.soft);
|
|
}
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int rfkill_fop_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct rfkill_data *data = file->private_data;
|
|
struct rfkill_int_event *ev, *tmp;
|
|
|
|
mutex_lock(&rfkill_global_mutex);
|
|
list_del(&data->list);
|
|
mutex_unlock(&rfkill_global_mutex);
|
|
|
|
mutex_destroy(&data->mtx);
|
|
list_for_each_entry_safe(ev, tmp, &data->events, list)
|
|
kfree(ev);
|
|
|
|
#ifdef CONFIG_RFKILL_INPUT
|
|
if (data->input_handler)
|
|
if (atomic_dec_return(&rfkill_input_disabled) == 0)
|
|
printk(KERN_DEBUG "rfkill: input handler enabled\n");
|
|
#endif
|
|
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_RFKILL_INPUT
|
|
static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct rfkill_data *data = file->private_data;
|
|
|
|
if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
|
|
return -ENOSYS;
|
|
|
|
if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
|
|
return -ENOSYS;
|
|
|
|
mutex_lock(&data->mtx);
|
|
|
|
if (!data->input_handler) {
|
|
if (atomic_inc_return(&rfkill_input_disabled) == 1)
|
|
printk(KERN_DEBUG "rfkill: input handler disabled\n");
|
|
data->input_handler = true;
|
|
}
|
|
|
|
mutex_unlock(&data->mtx);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations rfkill_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rfkill_fop_open,
|
|
.read = rfkill_fop_read,
|
|
.write = rfkill_fop_write,
|
|
.poll = rfkill_fop_poll,
|
|
.release = rfkill_fop_release,
|
|
#ifdef CONFIG_RFKILL_INPUT
|
|
.unlocked_ioctl = rfkill_fop_ioctl,
|
|
.compat_ioctl = rfkill_fop_ioctl,
|
|
#endif
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct miscdevice rfkill_miscdev = {
|
|
.name = "rfkill",
|
|
.fops = &rfkill_fops,
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
};
|
|
|
|
static int __init rfkill_init(void)
|
|
{
|
|
int error;
|
|
int i;
|
|
|
|
for (i = 0; i < NUM_RFKILL_TYPES; i++)
|
|
rfkill_global_states[i].cur = !rfkill_default_state;
|
|
|
|
error = class_register(&rfkill_class);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = misc_register(&rfkill_miscdev);
|
|
if (error) {
|
|
class_unregister(&rfkill_class);
|
|
goto out;
|
|
}
|
|
|
|
#ifdef CONFIG_RFKILL_INPUT
|
|
error = rfkill_handler_init();
|
|
if (error) {
|
|
misc_deregister(&rfkill_miscdev);
|
|
class_unregister(&rfkill_class);
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
subsys_initcall(rfkill_init);
|
|
|
|
static void __exit rfkill_exit(void)
|
|
{
|
|
#ifdef CONFIG_RFKILL_INPUT
|
|
rfkill_handler_exit();
|
|
#endif
|
|
misc_deregister(&rfkill_miscdev);
|
|
class_unregister(&rfkill_class);
|
|
}
|
|
module_exit(rfkill_exit);
|