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Diffstat (limited to 'net/rfkill/core.c')
| -rw-r--r-- | net/rfkill/core.c | 1228 |
1 files changed, 1228 insertions, 0 deletions
diff --git a/net/rfkill/core.c b/net/rfkill/core.c new file mode 100644 index 00000000000..11b7314723d --- /dev/null +++ b/net/rfkill/core.c @@ -0,0 +1,1228 @@ +/* + * Copyright (C) 2006 - 2007 Ivo van Doorn + * Copyright (C) 2007 Dmitry Torokhov + * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/workqueue.h> +#include <linux/capability.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/rfkill.h> +#include <linux/spinlock.h> +#include <linux/miscdevice.h> +#include <linux/wait.h> +#include <linux/poll.h> +#include <linux/fs.h> + +#include "rfkill.h" + +#define POLL_INTERVAL (5 * HZ) + +#define RFKILL_BLOCK_HW BIT(0) +#define RFKILL_BLOCK_SW BIT(1) +#define RFKILL_BLOCK_SW_PREV BIT(2) +#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\ + RFKILL_BLOCK_SW |\ + RFKILL_BLOCK_SW_PREV) +#define RFKILL_BLOCK_SW_SETCALL BIT(31) + +struct rfkill { + spinlock_t lock; + + const char *name; + enum rfkill_type type; + + unsigned long state; + + u32 idx; + + bool registered; + bool suspended; + + const struct rfkill_ops *ops; + void *data; + +#ifdef CONFIG_RFKILL_LEDS + struct led_trigger led_trigger; + const char *ledtrigname; +#endif + + struct device dev; + struct list_head node; + + struct delayed_work poll_work; + struct work_struct uevent_work; + struct work_struct sync_work; +}; +#define to_rfkill(d) container_of(d, struct rfkill, dev) + +struct rfkill_int_event { + struct list_head list; + struct rfkill_event ev; +}; + +struct rfkill_data { + struct list_head list; + struct list_head events; + struct mutex mtx; + wait_queue_head_t read_wait; + bool input_handler; +}; + + +MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); +MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); +MODULE_DESCRIPTION("RF switch support"); +MODULE_LICENSE("GPL"); + + +/* + * The locking here should be made much smarter, we currently have + * a bit of a stupid situation because drivers might want to register + * the rfkill struct under their own lock, and take this lock during + * rfkill method calls -- which will cause an AB-BA deadlock situation. + * + * To fix that, we need to rework this code here to be mostly lock-free + * and only use the mutex for list manipulations, not to protect the + * various other global variables. Then we can avoid holding the mutex + * around driver operations, and all is happy. + */ +static LIST_HEAD(rfkill_list); /* list of registered rf switches */ +static DEFINE_MUTEX(rfkill_global_mutex); +static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ + +static unsigned int rfkill_default_state = 1; +module_param_named(default_state, rfkill_default_state, uint, 0444); +MODULE_PARM_DESC(default_state, + "Default initial state for all radio types, 0 = radio off"); + +static struct { + bool cur, def; +} rfkill_global_states[NUM_RFKILL_TYPES]; + +static unsigned long rfkill_states_default_locked; + +static bool rfkill_epo_lock_active; + + +#ifdef CONFIG_RFKILL_LEDS +static void rfkill_led_trigger_event(struct rfkill *rfkill) +{ + struct led_trigger *trigger; + + if (!rfkill->registered) + return; + + trigger = &rfkill->led_trigger; + + if (rfkill->state & RFKILL_BLOCK_ANY) + led_trigger_event(trigger, LED_OFF); + else + led_trigger_event(trigger, LED_FULL); +} + +static void rfkill_led_trigger_activate(struct led_classdev *led) +{ + struct rfkill *rfkill; + + rfkill = container_of(led->trigger, struct rfkill, led_trigger); + + rfkill_led_trigger_event(rfkill); +} + +const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) +{ + return rfkill->led_trigger.name; +} +EXPORT_SYMBOL(rfkill_get_led_trigger_name); + +void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) +{ + BUG_ON(!rfkill); + + rfkill->ledtrigname = name; +} +EXPORT_SYMBOL(rfkill_set_led_trigger_name); + +static int rfkill_led_trigger_register(struct rfkill *rfkill) +{ + rfkill->led_trigger.name = rfkill->ledtrigname + ? : dev_name(&rfkill->dev); + rfkill->led_trigger.activate = rfkill_led_trigger_activate; + return led_trigger_register(&rfkill->led_trigger); +} + +static void rfkill_led_trigger_unregister(struct rfkill *rfkill) +{ + led_trigger_unregister(&rfkill->led_trigger); +} +#else +static void rfkill_led_trigger_event(struct rfkill *rfkill) +{ +} + +static inline int rfkill_led_trigger_register(struct rfkill *rfkill) +{ + return 0; +} + +static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) +{ +} +#endif /* CONFIG_RFKILL_LEDS */ + +static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, + enum rfkill_operation op) +{ + unsigned long flags; + + ev->idx = rfkill->idx; + ev->type = rfkill->type; + ev->op = op; + + spin_lock_irqsave(&rfkill->lock, flags); + ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); + ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | + RFKILL_BLOCK_SW_PREV)); + spin_unlock_irqrestore(&rfkill->lock, flags); +} + +static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) +{ + struct rfkill_data *data; + struct rfkill_int_event *ev; + + list_for_each_entry(data, &rfkill_fds, list) { + ev = kzalloc(sizeof(*ev), GFP_KERNEL); + if (!ev) + continue; + rfkill_fill_event(&ev->ev, rfkill, op); + mutex_lock(&data->mtx); + list_add_tail(&ev->list, &data->events); + mutex_unlock(&data->mtx); + wake_up_interruptible(&data->read_wait); + } +} + +static void rfkill_event(struct rfkill *rfkill) +{ + if (!rfkill->registered || rfkill->suspended) + return; + + kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); + + /* also send event to /dev/rfkill */ + rfkill_send_events(rfkill, RFKILL_OP_CHANGE); +} + +static bool __rfkill_set_hw_state(struct rfkill *rfkill, + bool blocked, bool *change) +{ + unsigned long flags; + bool prev, any; + + BUG_ON(!rfkill); + + spin_lock_irqsave(&rfkill->lock, flags); + prev = !!(rfkill->state & RFKILL_BLOCK_HW); + if (blocked) + rfkill->state |= RFKILL_BLOCK_HW; + else + rfkill->state &= ~RFKILL_BLOCK_HW; + *change = prev != blocked; + any = rfkill->state & RFKILL_BLOCK_ANY; + spin_unlock_irqrestore(&rfkill->lock, flags); + + rfkill_led_trigger_event(rfkill); + + return any; +} + +/** + * rfkill_set_block - wrapper for set_block method + * + * @rfkill: the rfkill struct to use + * @blocked: the new software state + * + * Calls the set_block method (when applicable) and handles notifications + * etc. as well. + */ +static void rfkill_set_block(struct rfkill *rfkill, bool blocked) +{ + unsigned long flags; + int err; + + /* + * Some platforms (...!) generate input events which affect the + * _hard_ kill state -- whenever something tries to change the + * current software state query the hardware state too. + */ + if (rfkill->ops->query) + rfkill->ops->query(rfkill, rfkill->data); + + spin_lock_irqsave(&rfkill->lock, flags); + if (rfkill->state & RFKILL_BLOCK_SW) + rfkill->state |= RFKILL_BLOCK_SW_PREV; + else + rfkill->state &= ~RFKILL_BLOCK_SW_PREV; + + if (blocked) + rfkill->state |= RFKILL_BLOCK_SW; + else + rfkill->state &= ~RFKILL_BLOCK_SW; + + rfkill->state |= RFKILL_BLOCK_SW_SETCALL; + spin_unlock_irqrestore(&rfkill->lock, flags); + + if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) + return; + + err = rfkill->ops->set_block(rfkill->data, blocked); + + spin_lock_irqsave(&rfkill->lock, flags); + if (err) { + /* + * Failed -- reset status to _prev, this may be different + * from what set set _PREV to earlier in this function + * if rfkill_set_sw_state was invoked. + */ + if (rfkill->state & RFKILL_BLOCK_SW_PREV) + rfkill->state |= RFKILL_BLOCK_SW; + else + rfkill->state &= ~RFKILL_BLOCK_SW; + } + rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; + rfkill->state &= ~RFKILL_BLOCK_SW_PREV; + spin_unlock_irqrestore(&rfkill->lock, flags); + + rfkill_led_trigger_event(rfkill); + rfkill_event(rfkill); +} + +#ifdef CONFIG_RFKILL_INPUT +static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); + +/** + * __rfkill_switch_all - Toggle state of all switches of given type + * @type: type of interfaces to be affected + * @state: the new state + * + * This function sets the state of all switches of given type, + * unless a specific switch is claimed by userspace (in which case, + * that switch is left alone) or suspended. + * + * Caller must have acquired rfkill_global_mutex. + */ +static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) +{ + struct rfkill *rfkill; + + rfkill_global_states[type].cur = blocked; + list_for_each_entry(rfkill, &rfkill_list, node) { + if (rfkill->type != type) + continue; + + rfkill_set_block(rfkill, blocked); + } +} + +/** + * rfkill_switch_all - Toggle state of all switches of given type + * @type: type of interfaces to be affected + * @state: the new state + * + * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). + * Please refer to __rfkill_switch_all() for details. + * + * Does nothing if the EPO lock is active. + */ +void rfkill_switch_all(enum rfkill_type type, bool blocked) +{ + if (atomic_read(&rfkill_input_disabled)) + return; + + mutex_lock(&rfkill_global_mutex); + + if (!rfkill_epo_lock_active) + __rfkill_switch_all(type, blocked); + + mutex_unlock(&rfkill_global_mutex); +} + +/** + * rfkill_epo - emergency power off all transmitters + * + * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, + * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. + * + * The global state before the EPO is saved and can be restored later + * using rfkill_restore_states(). + */ +void rfkill_epo(void) +{ + struct rfkill *rfkill; + int i; + + if (atomic_read(&rfkill_input_disabled)) + return; + + mutex_lock(&rfkill_global_mutex); + + rfkill_epo_lock_active = true; + list_for_each_entry(rfkill, &rfkill_list, node) + rfkill_set_block(rfkill, true); + + for (i = 0; i < NUM_RFKILL_TYPES; i++) { + rfkill_global_states[i].def = rfkill_global_states[i].cur; + rfkill_global_states[i].cur = true; + } + + mutex_unlock(&rfkill_global_mutex); +} + +/** + * rfkill_restore_states - restore global states + * + * Restore (and sync switches to) the global state from the + * states in rfkill_default_states. This can undo the effects of + * a call to rfkill_epo(). + */ +void rfkill_restore_states(void) +{ + int i; + + if (atomic_read(&rfkill_input_disabled)) + return; + + mutex_lock(&rfkill_global_mutex); + + rfkill_epo_lock_active = false; + for (i = 0; i < NUM_RFKILL_TYPES; i++) + __rfkill_switch_all(i, rfkill_global_states[i].def); + mutex_unlock(&rfkill_global_mutex); +} + +/** + * rfkill_remove_epo_lock - unlock state changes + * + * Used by rfkill-input manually unlock state changes, when + * the EPO switch is deactivated. + */ +void rfkill_remove_epo_lock(void) +{ + if (atomic_read(&rfkill_input_disabled)) + return; + + mutex_lock(&rfkill_global_mutex); + rfkill_epo_lock_active = false; + mutex_unlock(&rfkill_global_mutex); +} + +/** + * rfkill_is_epo_lock_active - returns true EPO is active + * + * Returns 0 (false) if there is NOT an active EPO contidion, + * and 1 (true) if there is an active EPO contition, which + * locks all radios in one of the BLOCKED states. + * + * Can be called in atomic context. + */ +bool rfkill_is_epo_lock_active(void) +{ + return rfkill_epo_lock_active; +} + +/** + * rfkill_get_global_sw_state - returns global state for a type + * @type: the type to get the global state of + * + * Returns the current global state for a given wireless + * device type. + */ +bool rfkill_get_global_sw_state(const enum rfkill_type type) +{ + return rfkill_global_states[type].cur; +} +#endif + +void rfkill_set_global_sw_state(const enum rfkill_type type, bool blocked) +{ + BUG_ON(type == RFKILL_TYPE_ALL); + + mutex_lock(&rfkill_global_mutex); + + /* don't allow unblock when epo */ + if (rfkill_epo_lock_active && !blocked) + goto out; + + /* too late */ + if (rfkill_states_default_locked & BIT(type)) + goto out; + + rfkill_states_default_locked |= BIT(type); + + rfkill_global_states[type].cur = blocked; + rfkill_global_states[type].def = blocked; + out: + mutex_unlock(&rfkill_global_mutex); +} +EXPORT_SYMBOL(rfkill_set_global_sw_state); + + +bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) +{ + bool ret, change; + + ret = __rfkill_set_hw_state(rfkill, blocked, &change); + + if (!rfkill->registered) + return ret; + + if (change) + schedule_work(&rfkill->uevent_work); + + return ret; +} +EXPORT_SYMBOL(rfkill_set_hw_state); + +static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) +{ + u32 bit = RFKILL_BLOCK_SW; + + /* if in a ops->set_block right now, use other bit */ + if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) + bit = RFKILL_BLOCK_SW_PREV; + + if (blocked) + rfkill->state |= bit; + else + rfkill->state &= ~bit; +} + +bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) +{ + unsigned long flags; + bool prev, hwblock; + + BUG_ON(!rfkill); + + spin_lock_irqsave(&rfkill->lock, flags); + prev = !!(rfkill->state & RFKILL_BLOCK_SW); + __rfkill_set_sw_state(rfkill, blocked); + hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); + blocked = blocked || hwblock; + spin_unlock_irqrestore(&rfkill->lock, flags); + + if (!rfkill->registered) + return blocked; + + if (prev != blocked && !hwblock) + schedule_work(&rfkill->uevent_work); + + rfkill_led_trigger_event(rfkill); + + return blocked; +} +EXPORT_SYMBOL(rfkill_set_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); + + spin_unlock_irqrestore(&rfkill->lock, flags); + + if (!rfkill->registered) + return; + + 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) +{ + 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"; + default: + BUG(); + } + + BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_WWAN + 1); +} + +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 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); + unsigned long flags; + u32 state; + + spin_lock_irqsave(&rfkill->lock, flags); + state = rfkill->state; + spin_unlock_irqrestore(&rfkill->lock, flags); + + return sprintf(buf, "%d\n", user_state_from_blocked(state)); +} + +static ssize_t rfkill_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + /* + * The intention was that userspace can only take control over + * a given device when/if rfkill-input doesn't control it due + * to user_claim. Since user_claim is currently unsupported, + * we never support changing the state from userspace -- this + * can be implemented again later. + */ + + return -EPERM; +} + +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(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), + __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), + __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); + + rfkill->suspended = true; + + return 0; +} + +static int rfkill_resume(struct device *dev) +{ + struct rfkill *rfkill = to_rfkill(dev); + bool cur; + + mutex_lock(&rfkill_global_mutex); + cur = rfkill_global_states[rfkill->type].cur; + rfkill_set_block(rfkill, cur); + mutex_unlock(&rfkill_global_mutex); + + rfkill->suspended = false; + + schedule_work(&rfkill->uevent_work); + + 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++; + + if (!(rfkill_states_default_locked & BIT(rfkill->type))) { + /* first of its kind */ + BUILD_BUG_ON(NUM_RFKILL_TYPES > + sizeof(rfkill_states_default_locked) * 8); + rfkill_states_default_locked |= BIT(rfkill->type); + rfkill_global_states[rfkill->type].cur = + rfkill_global_states[rfkill->type].def; + } + + 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)); + schedule_work(&rfkill->sync_work); + + 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_add(&data->list, &rfkill_fds); + + 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); + } + 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 < sizeof(ev) - 1) + return -EINVAL; + + if (copy_from_user(&ev, buf, sizeof(ev) - 1)) + 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) + atomic_dec(&rfkill_input_disabled); +#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) { + atomic_inc(&rfkill_input_disabled); + data->input_handler = true; + } + + mutex_unlock(&data->mtx); + + return 0; +} +#endif + +static const struct file_operations rfkill_fops = { + .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 +}; + +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].def = !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); |