![Felipe Balbi](/assets/img/avatar_default.png)
Trivial patch adding a missing line break on rfkill_claim_show(). Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com> Acked-by: Ivo van Doorn <IvDoorn@gmail.co> Signed-off-by: John W. Linville <linville@tuxdriver.com>
721 lines
19 KiB
C
721 lines
19 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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*
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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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/* Get declaration of rfkill_switch_all() to shut up sparse. */
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#include "rfkill-input.h"
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MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
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MODULE_VERSION("1.0");
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MODULE_DESCRIPTION("RF switch support");
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MODULE_LICENSE("GPL");
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static LIST_HEAD(rfkill_list); /* list of registered rf switches */
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static DEFINE_MUTEX(rfkill_mutex);
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static unsigned int rfkill_default_state = RFKILL_STATE_UNBLOCKED;
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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 enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
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static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
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/**
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* register_rfkill_notifier - Add notifier to rfkill notifier chain
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* @nb: pointer to the new entry to add to the chain
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*
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* See blocking_notifier_chain_register() for return value and further
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* observations.
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*
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* Adds a notifier to the rfkill notifier chain. The chain will be
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* called with a pointer to the relevant rfkill structure as a parameter,
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* refer to include/linux/rfkill.h for the possible events.
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*
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* Notifiers added to this chain are to always return NOTIFY_DONE. This
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* chain is a blocking notifier chain: notifiers can sleep.
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*
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* Calls to this chain may have been done through a workqueue. One must
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* assume unordered asynchronous behaviour, there is no way to know if
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* actions related to the event that generated the notification have been
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* carried out already.
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*/
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int register_rfkill_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(register_rfkill_notifier);
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/**
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* unregister_rfkill_notifier - remove notifier from rfkill notifier chain
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* @nb: pointer to the entry to remove from the chain
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*
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* See blocking_notifier_chain_unregister() for return value and further
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* observations.
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*
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* Removes a notifier from the rfkill notifier chain.
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*/
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int unregister_rfkill_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
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static void rfkill_led_trigger(struct rfkill *rfkill,
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enum rfkill_state state)
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{
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#ifdef CONFIG_RFKILL_LEDS
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struct led_trigger *led = &rfkill->led_trigger;
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if (!led->name)
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return;
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if (state != RFKILL_STATE_UNBLOCKED)
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led_trigger_event(led, LED_OFF);
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else
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led_trigger_event(led, LED_FULL);
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#endif /* CONFIG_RFKILL_LEDS */
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}
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#ifdef CONFIG_RFKILL_LEDS
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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 = container_of(led->trigger,
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struct rfkill, led_trigger);
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rfkill_led_trigger(rfkill, rfkill->state);
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}
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#endif /* CONFIG_RFKILL_LEDS */
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static void notify_rfkill_state_change(struct rfkill *rfkill)
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{
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blocking_notifier_call_chain(&rfkill_notifier_list,
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RFKILL_STATE_CHANGED,
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rfkill);
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}
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static void update_rfkill_state(struct rfkill *rfkill)
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{
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enum rfkill_state newstate, oldstate;
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if (rfkill->get_state) {
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mutex_lock(&rfkill->mutex);
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if (!rfkill->get_state(rfkill->data, &newstate)) {
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oldstate = rfkill->state;
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rfkill->state = newstate;
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if (oldstate != newstate)
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notify_rfkill_state_change(rfkill);
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}
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mutex_unlock(&rfkill->mutex);
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}
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}
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/**
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* rfkill_toggle_radio - wrapper for toggle_radio hook
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* @rfkill: the rfkill struct to use
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* @force: calls toggle_radio even if cache says it is not needed,
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* and also makes sure notifications of the state will be
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* sent even if it didn't change
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* @state: the new state to call toggle_radio() with
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*
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* Calls rfkill->toggle_radio, enforcing the API for toggle_radio
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* calls and handling all the red tape such as issuing notifications
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* if the call is successful.
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*
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* Suspended devices are not touched at all, and -EAGAIN is returned.
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*
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* Note that the @force parameter cannot override a (possibly cached)
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* state of RFKILL_STATE_HARD_BLOCKED. Any device making use of
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* RFKILL_STATE_HARD_BLOCKED implements either get_state() or
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* rfkill_force_state(), so the cache either is bypassed or valid.
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*
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* Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
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* even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
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* give the driver a hint that it should double-BLOCK the transmitter.
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*
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* Caller must have acquired rfkill->mutex.
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*/
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static int rfkill_toggle_radio(struct rfkill *rfkill,
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enum rfkill_state state,
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int force)
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{
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int retval = 0;
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enum rfkill_state oldstate, newstate;
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if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
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return -EBUSY;
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oldstate = rfkill->state;
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if (rfkill->get_state && !force &&
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!rfkill->get_state(rfkill->data, &newstate))
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rfkill->state = newstate;
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switch (state) {
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case RFKILL_STATE_HARD_BLOCKED:
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/* typically happens when refreshing hardware state,
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* such as on resume */
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state = RFKILL_STATE_SOFT_BLOCKED;
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break;
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case RFKILL_STATE_UNBLOCKED:
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/* force can't override this, only rfkill_force_state() can */
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if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
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return -EPERM;
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break;
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case RFKILL_STATE_SOFT_BLOCKED:
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/* nothing to do, we want to give drivers the hint to double
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* BLOCK even a transmitter that is already in state
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* RFKILL_STATE_HARD_BLOCKED */
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break;
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}
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if (force || state != rfkill->state) {
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retval = rfkill->toggle_radio(rfkill->data, state);
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/* never allow a HARD->SOFT downgrade! */
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if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
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rfkill->state = state;
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}
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if (force || rfkill->state != oldstate) {
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rfkill_led_trigger(rfkill, rfkill->state);
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notify_rfkill_state_change(rfkill);
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}
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return retval;
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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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* This function toggles 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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void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
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{
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struct rfkill *rfkill;
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mutex_lock(&rfkill_mutex);
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rfkill_states[type] = state;
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list_for_each_entry(rfkill, &rfkill_list, node) {
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if ((!rfkill->user_claim) && (rfkill->type == type)) {
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mutex_lock(&rfkill->mutex);
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rfkill_toggle_radio(rfkill, state, 0);
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mutex_unlock(&rfkill->mutex);
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}
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}
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mutex_unlock(&rfkill_mutex);
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}
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EXPORT_SYMBOL(rfkill_switch_all);
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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_mutex and rfkill->mutex.
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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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mutex_lock(&rfkill_mutex);
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list_for_each_entry(rfkill, &rfkill_list, node) {
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mutex_lock(&rfkill->mutex);
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rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
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mutex_unlock(&rfkill->mutex);
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}
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mutex_unlock(&rfkill_mutex);
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}
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EXPORT_SYMBOL_GPL(rfkill_epo);
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/**
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* rfkill_force_state - Force the internal rfkill radio state
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* @rfkill: pointer to the rfkill class to modify.
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* @state: the current radio state the class should be forced to.
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*
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* This function updates the internal state of the radio cached
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* by the rfkill class. It should be used when the driver gets
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* a notification by the firmware/hardware of the current *real*
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* state of the radio rfkill switch.
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*
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* Devices which are subject to external changes on their rfkill
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* state (such as those caused by a hardware rfkill line) MUST
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* have their driver arrange to call rfkill_force_state() as soon
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* as possible after such a change.
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*
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* This function may not be called from an atomic context.
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*/
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int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
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{
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enum rfkill_state oldstate;
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if (state != RFKILL_STATE_SOFT_BLOCKED &&
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state != RFKILL_STATE_UNBLOCKED &&
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state != RFKILL_STATE_HARD_BLOCKED)
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return -EINVAL;
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mutex_lock(&rfkill->mutex);
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oldstate = rfkill->state;
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rfkill->state = state;
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if (state != oldstate)
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notify_rfkill_state_change(rfkill);
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mutex_unlock(&rfkill->mutex);
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return 0;
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}
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EXPORT_SYMBOL(rfkill_force_state);
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static ssize_t rfkill_name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%s\n", rfkill->name);
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}
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static const char *rfkill_get_type_str(enum rfkill_type type)
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{
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switch (type) {
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case RFKILL_TYPE_WLAN:
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return "wlan";
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case RFKILL_TYPE_BLUETOOTH:
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return "bluetooth";
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case RFKILL_TYPE_UWB:
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return "ultrawideband";
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case RFKILL_TYPE_WIMAX:
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return "wimax";
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case RFKILL_TYPE_WWAN:
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return "wwan";
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default:
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BUG();
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}
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}
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static ssize_t rfkill_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
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}
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static ssize_t rfkill_state_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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update_rfkill_state(rfkill);
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return sprintf(buf, "%d\n", rfkill->state);
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}
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static ssize_t rfkill_state_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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unsigned int state = simple_strtoul(buf, NULL, 0);
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int error;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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/* RFKILL_STATE_HARD_BLOCKED is illegal here... */
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if (state != RFKILL_STATE_UNBLOCKED &&
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state != RFKILL_STATE_SOFT_BLOCKED)
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return -EINVAL;
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if (mutex_lock_interruptible(&rfkill->mutex))
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return -ERESTARTSYS;
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error = rfkill_toggle_radio(rfkill, state, 0);
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mutex_unlock(&rfkill->mutex);
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return error ? error : count;
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}
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static ssize_t rfkill_claim_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%d\n", rfkill->user_claim);
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}
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static ssize_t rfkill_claim_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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bool claim = !!simple_strtoul(buf, NULL, 0);
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int error;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (rfkill->user_claim_unsupported)
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return -EOPNOTSUPP;
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/*
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* Take the global lock to make sure the kernel is not in
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* the middle of rfkill_switch_all
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*/
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error = mutex_lock_interruptible(&rfkill_mutex);
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if (error)
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return error;
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if (rfkill->user_claim != claim) {
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if (!claim) {
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mutex_lock(&rfkill->mutex);
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rfkill_toggle_radio(rfkill,
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rfkill_states[rfkill->type],
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0);
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mutex_unlock(&rfkill->mutex);
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}
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rfkill->user_claim = claim;
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}
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mutex_unlock(&rfkill_mutex);
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return error ? error : count;
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}
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static struct device_attribute rfkill_dev_attrs[] = {
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__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
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__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
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__ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
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__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
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__ATTR_NULL
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};
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static void rfkill_release(struct device *dev)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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kfree(rfkill);
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module_put(THIS_MODULE);
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}
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#ifdef CONFIG_PM
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static int rfkill_suspend(struct device *dev, pm_message_t state)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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if (dev->power.power_state.event != state.event) {
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if (state.event & PM_EVENT_SLEEP) {
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/* Stop transmitter, keep state, no notifies */
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update_rfkill_state(rfkill);
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mutex_lock(&rfkill->mutex);
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rfkill->toggle_radio(rfkill->data,
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RFKILL_STATE_SOFT_BLOCKED);
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mutex_unlock(&rfkill->mutex);
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}
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dev->power.power_state = state;
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}
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return 0;
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}
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static int rfkill_resume(struct device *dev)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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if (dev->power.power_state.event != PM_EVENT_ON) {
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mutex_lock(&rfkill->mutex);
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dev->power.power_state.event = PM_EVENT_ON;
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/* restore radio state AND notify everybody */
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rfkill_toggle_radio(rfkill, rfkill->state, 1);
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mutex_unlock(&rfkill->mutex);
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}
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return 0;
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}
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#else
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#define rfkill_suspend NULL
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#define rfkill_resume NULL
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#endif
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static int rfkill_blocking_uevent_notifier(struct notifier_block *nb,
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unsigned long eventid,
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void *data)
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{
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struct rfkill *rfkill = (struct rfkill *)data;
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switch (eventid) {
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case RFKILL_STATE_CHANGED:
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kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
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break;
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default:
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block rfkill_blocking_uevent_nb = {
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.notifier_call = rfkill_blocking_uevent_notifier,
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.priority = 0,
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};
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static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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int error;
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error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
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if (error)
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return error;
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error = add_uevent_var(env, "RFKILL_TYPE=%s",
|
|
rfkill_get_type_str(rfkill->type));
|
|
if (error)
|
|
return error;
|
|
error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
|
|
return error;
|
|
}
|
|
|
|
static struct class rfkill_class = {
|
|
.name = "rfkill",
|
|
.dev_release = rfkill_release,
|
|
.dev_attrs = rfkill_dev_attrs,
|
|
.suspend = rfkill_suspend,
|
|
.resume = rfkill_resume,
|
|
.dev_uevent = rfkill_dev_uevent,
|
|
};
|
|
|
|
static int rfkill_add_switch(struct rfkill *rfkill)
|
|
{
|
|
mutex_lock(&rfkill_mutex);
|
|
|
|
rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
|
|
|
|
list_add_tail(&rfkill->node, &rfkill_list);
|
|
|
|
mutex_unlock(&rfkill_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rfkill_remove_switch(struct rfkill *rfkill)
|
|
{
|
|
mutex_lock(&rfkill_mutex);
|
|
list_del_init(&rfkill->node);
|
|
mutex_unlock(&rfkill_mutex);
|
|
|
|
mutex_lock(&rfkill->mutex);
|
|
rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
|
|
mutex_unlock(&rfkill->mutex);
|
|
}
|
|
|
|
/**
|
|
* rfkill_allocate - allocate memory for rfkill structure.
|
|
* @parent: device that has rf switch on it
|
|
* @type: type of the switch (RFKILL_TYPE_*)
|
|
*
|
|
* This function should be called by the network driver when it needs
|
|
* rfkill structure. Once the structure is allocated the driver should
|
|
* finish its initialization by setting the name, private data, enable_radio
|
|
* and disable_radio methods and then register it with rfkill_register().
|
|
*
|
|
* NOTE: If registration fails the structure shoudl be freed by calling
|
|
* rfkill_free() otherwise rfkill_unregister() should be used.
|
|
*/
|
|
struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
|
|
{
|
|
struct rfkill *rfkill;
|
|
struct device *dev;
|
|
|
|
rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
|
|
if (!rfkill)
|
|
return NULL;
|
|
|
|
mutex_init(&rfkill->mutex);
|
|
INIT_LIST_HEAD(&rfkill->node);
|
|
rfkill->type = type;
|
|
|
|
dev = &rfkill->dev;
|
|
dev->class = &rfkill_class;
|
|
dev->parent = parent;
|
|
device_initialize(dev);
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
return rfkill;
|
|
}
|
|
EXPORT_SYMBOL(rfkill_allocate);
|
|
|
|
/**
|
|
* rfkill_free - Mark rfkill structure for deletion
|
|
* @rfkill: rfkill structure to be destroyed
|
|
*
|
|
* Decrements reference count of the rfkill structure so it is destroyed.
|
|
* Note that rfkill_free() should _not_ be called after rfkill_unregister().
|
|
*/
|
|
void rfkill_free(struct rfkill *rfkill)
|
|
{
|
|
if (rfkill)
|
|
put_device(&rfkill->dev);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_free);
|
|
|
|
static void rfkill_led_trigger_register(struct rfkill *rfkill)
|
|
{
|
|
#ifdef CONFIG_RFKILL_LEDS
|
|
int error;
|
|
|
|
if (!rfkill->led_trigger.name)
|
|
rfkill->led_trigger.name = rfkill->dev.bus_id;
|
|
if (!rfkill->led_trigger.activate)
|
|
rfkill->led_trigger.activate = rfkill_led_trigger_activate;
|
|
error = led_trigger_register(&rfkill->led_trigger);
|
|
if (error)
|
|
rfkill->led_trigger.name = NULL;
|
|
#endif /* CONFIG_RFKILL_LEDS */
|
|
}
|
|
|
|
static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
|
|
{
|
|
#ifdef CONFIG_RFKILL_LEDS
|
|
if (rfkill->led_trigger.name) {
|
|
led_trigger_unregister(&rfkill->led_trigger);
|
|
rfkill->led_trigger.name = NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* rfkill_register - Register a rfkill structure.
|
|
* @rfkill: rfkill structure to be registered
|
|
*
|
|
* This function should be called by the network driver when the rfkill
|
|
* structure needs to be registered. Immediately from registration the
|
|
* switch driver should be able to service calls to toggle_radio.
|
|
*/
|
|
int rfkill_register(struct rfkill *rfkill)
|
|
{
|
|
static atomic_t rfkill_no = ATOMIC_INIT(0);
|
|
struct device *dev = &rfkill->dev;
|
|
int error;
|
|
|
|
if (!rfkill->toggle_radio)
|
|
return -EINVAL;
|
|
if (rfkill->type >= RFKILL_TYPE_MAX)
|
|
return -EINVAL;
|
|
|
|
snprintf(dev->bus_id, sizeof(dev->bus_id),
|
|
"rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
|
|
|
|
rfkill_led_trigger_register(rfkill);
|
|
|
|
error = rfkill_add_switch(rfkill);
|
|
if (error) {
|
|
rfkill_led_trigger_unregister(rfkill);
|
|
return error;
|
|
}
|
|
|
|
error = device_add(dev);
|
|
if (error) {
|
|
rfkill_remove_switch(rfkill);
|
|
rfkill_led_trigger_unregister(rfkill);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rfkill_register);
|
|
|
|
/**
|
|
* rfkill_unregister - Unregister a rfkill structure.
|
|
* @rfkill: rfkill structure to be unregistered
|
|
*
|
|
* This function should be called by the network driver during device
|
|
* teardown to destroy rfkill structure. Note that rfkill_free() should
|
|
* _not_ be called after rfkill_unregister().
|
|
*/
|
|
void rfkill_unregister(struct rfkill *rfkill)
|
|
{
|
|
device_del(&rfkill->dev);
|
|
rfkill_remove_switch(rfkill);
|
|
rfkill_led_trigger_unregister(rfkill);
|
|
put_device(&rfkill->dev);
|
|
}
|
|
EXPORT_SYMBOL(rfkill_unregister);
|
|
|
|
/*
|
|
* Rfkill module initialization/deinitialization.
|
|
*/
|
|
static int __init rfkill_init(void)
|
|
{
|
|
int error;
|
|
int i;
|
|
|
|
/* RFKILL_STATE_HARD_BLOCKED is illegal here... */
|
|
if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
|
|
rfkill_default_state != RFKILL_STATE_UNBLOCKED)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
|
|
rfkill_states[i] = rfkill_default_state;
|
|
|
|
error = class_register(&rfkill_class);
|
|
if (error) {
|
|
printk(KERN_ERR "rfkill: unable to register rfkill class\n");
|
|
return error;
|
|
}
|
|
|
|
register_rfkill_notifier(&rfkill_blocking_uevent_nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit rfkill_exit(void)
|
|
{
|
|
unregister_rfkill_notifier(&rfkill_blocking_uevent_nb);
|
|
class_unregister(&rfkill_class);
|
|
}
|
|
|
|
subsys_initcall(rfkill_init);
|
|
module_exit(rfkill_exit);
|