447 lines
13 KiB
C
447 lines
13 KiB
C
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/*
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* Linux WiMAX
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* RF-kill framework integration
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*
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*
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* Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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 Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* This integrates into the Linux Kernel rfkill susbystem so that the
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* drivers just have to do the bare minimal work, which is providing a
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* method to set the software RF-Kill switch and to report changes in
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* the software and hardware switch status.
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*
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* A non-polled generic rfkill device is embedded into the WiMAX
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* subsystem's representation of a device.
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*
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* FIXME: Need polled support? Let drivers provide a poll routine
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* and hand it to rfkill ops then?
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*
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* All device drivers have to do is after wimax_dev_init(), call
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* wimax_report_rfkill_hw() and wimax_report_rfkill_sw() to update
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* initial state and then every time it changes. See wimax.h:struct
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* wimax_dev for more information.
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*
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* ROADMAP
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*
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* wimax_gnl_doit_rfkill() User space calling wimax_rfkill()
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* wimax_rfkill() Kernel calling wimax_rfkill()
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* __wimax_rf_toggle_radio()
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*
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* wimax_rfkill_set_radio_block() RF-Kill subsystem calling
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* __wimax_rf_toggle_radio()
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*
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* __wimax_rf_toggle_radio()
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* wimax_dev->op_rfkill_sw_toggle() Driver backend
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* __wimax_state_change()
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*
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* wimax_report_rfkill_sw() Driver reports state change
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* __wimax_state_change()
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*
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* wimax_report_rfkill_hw() Driver reports state change
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* __wimax_state_change()
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*
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* wimax_rfkill_add() Initialize/shutdown rfkill support
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* wimax_rfkill_rm() [called by wimax_dev_add/rm()]
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*/
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#include <net/wimax.h>
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#include <net/genetlink.h>
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#include <linux/wimax.h>
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#include <linux/security.h>
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#include <linux/rfkill.h>
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#include <linux/export.h>
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#include "wimax-internal.h"
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#define D_SUBMODULE op_rfkill
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#include "debug-levels.h"
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/**
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* wimax_report_rfkill_hw - Reports changes in the hardware RF switch
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*
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* @wimax_dev: WiMAX device descriptor
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*
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* @state: New state of the RF Kill switch. %WIMAX_RF_ON radio on,
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* %WIMAX_RF_OFF radio off.
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*
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* When the device detects a change in the state of thehardware RF
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* switch, it must call this function to let the WiMAX kernel stack
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* know that the state has changed so it can be properly propagated.
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*
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* The WiMAX stack caches the state (the driver doesn't need to). As
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* well, as the change is propagated it will come back as a request to
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* change the software state to mirror the hardware state.
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*
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* If the device doesn't have a hardware kill switch, just report
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* it on initialization as always on (%WIMAX_RF_ON, radio on).
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*/
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void wimax_report_rfkill_hw(struct wimax_dev *wimax_dev,
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enum wimax_rf_state state)
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{
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int result;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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enum wimax_st wimax_state;
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d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
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BUG_ON(state == WIMAX_RF_QUERY);
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BUG_ON(state != WIMAX_RF_ON && state != WIMAX_RF_OFF);
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mutex_lock(&wimax_dev->mutex);
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result = wimax_dev_is_ready(wimax_dev);
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if (result < 0)
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goto error_not_ready;
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if (state != wimax_dev->rf_hw) {
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wimax_dev->rf_hw = state;
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if (wimax_dev->rf_hw == WIMAX_RF_ON &&
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wimax_dev->rf_sw == WIMAX_RF_ON)
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wimax_state = WIMAX_ST_READY;
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else
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wimax_state = WIMAX_ST_RADIO_OFF;
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result = rfkill_set_hw_state(wimax_dev->rfkill,
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state == WIMAX_RF_OFF);
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__wimax_state_change(wimax_dev, wimax_state);
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}
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error_not_ready:
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mutex_unlock(&wimax_dev->mutex);
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d_fnend(3, dev, "(wimax_dev %p state %u) = void [%d]\n",
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wimax_dev, state, result);
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}
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EXPORT_SYMBOL_GPL(wimax_report_rfkill_hw);
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/**
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* wimax_report_rfkill_sw - Reports changes in the software RF switch
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*
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* @wimax_dev: WiMAX device descriptor
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*
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* @state: New state of the RF kill switch. %WIMAX_RF_ON radio on,
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* %WIMAX_RF_OFF radio off.
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*
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* Reports changes in the software RF switch state to the WiMAX stack.
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*
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* The main use is during initialization, so the driver can query the
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* device for its current software radio kill switch state and feed it
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* to the system.
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*
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* On the side, the device does not change the software state by
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* itself. In practice, this can happen, as the device might decide to
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* switch (in software) the radio off for different reasons.
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*/
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void wimax_report_rfkill_sw(struct wimax_dev *wimax_dev,
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enum wimax_rf_state state)
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{
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int result;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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enum wimax_st wimax_state;
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d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
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BUG_ON(state == WIMAX_RF_QUERY);
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BUG_ON(state != WIMAX_RF_ON && state != WIMAX_RF_OFF);
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mutex_lock(&wimax_dev->mutex);
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result = wimax_dev_is_ready(wimax_dev);
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if (result < 0)
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goto error_not_ready;
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if (state != wimax_dev->rf_sw) {
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wimax_dev->rf_sw = state;
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if (wimax_dev->rf_hw == WIMAX_RF_ON &&
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wimax_dev->rf_sw == WIMAX_RF_ON)
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wimax_state = WIMAX_ST_READY;
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else
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wimax_state = WIMAX_ST_RADIO_OFF;
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__wimax_state_change(wimax_dev, wimax_state);
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rfkill_set_sw_state(wimax_dev->rfkill, state == WIMAX_RF_OFF);
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}
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error_not_ready:
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mutex_unlock(&wimax_dev->mutex);
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d_fnend(3, dev, "(wimax_dev %p state %u) = void [%d]\n",
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wimax_dev, state, result);
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}
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EXPORT_SYMBOL_GPL(wimax_report_rfkill_sw);
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/*
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* Callback for the RF Kill toggle operation
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*
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* This function is called by:
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*
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* - The rfkill subsystem when the RF-Kill key is pressed in the
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* hardware and the driver notifies through
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* wimax_report_rfkill_hw(). The rfkill subsystem ends up calling back
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* here so the software RF Kill switch state is changed to reflect
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* the hardware switch state.
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*
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* - When the user sets the state through sysfs' rfkill/state file
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*
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* - When the user calls wimax_rfkill().
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*
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* This call blocks!
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*
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* WARNING! When we call rfkill_unregister(), this will be called with
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* state 0!
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*
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* WARNING: wimax_dev must be locked
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*/
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static
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int __wimax_rf_toggle_radio(struct wimax_dev *wimax_dev,
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enum wimax_rf_state state)
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{
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int result = 0;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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enum wimax_st wimax_state;
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might_sleep();
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d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
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if (wimax_dev->rf_sw == state)
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goto out_no_change;
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if (wimax_dev->op_rfkill_sw_toggle != NULL)
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result = wimax_dev->op_rfkill_sw_toggle(wimax_dev, state);
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else if (state == WIMAX_RF_OFF) /* No op? can't turn off */
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result = -ENXIO;
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else /* No op? can turn on */
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result = 0; /* should never happen tho */
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if (result >= 0) {
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result = 0;
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wimax_dev->rf_sw = state;
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wimax_state = state == WIMAX_RF_ON ?
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WIMAX_ST_READY : WIMAX_ST_RADIO_OFF;
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__wimax_state_change(wimax_dev, wimax_state);
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}
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out_no_change:
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d_fnend(3, dev, "(wimax_dev %p state %u) = %d\n",
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wimax_dev, state, result);
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return result;
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}
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/*
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* Translate from rfkill state to wimax state
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*
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* NOTE: Special state handling rules here
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*
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* Just pretend the call didn't happen if we are in a state where
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* we know for sure it cannot be handled (WIMAX_ST_DOWN or
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* __WIMAX_ST_QUIESCING). rfkill() needs it to register and
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* unregister, as it will run this path.
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*
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* NOTE: This call will block until the operation is completed.
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*/
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static int wimax_rfkill_set_radio_block(void *data, bool blocked)
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{
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int result;
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struct wimax_dev *wimax_dev = data;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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enum wimax_rf_state rf_state;
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d_fnstart(3, dev, "(wimax_dev %p blocked %u)\n", wimax_dev, blocked);
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rf_state = WIMAX_RF_ON;
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if (blocked)
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rf_state = WIMAX_RF_OFF;
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mutex_lock(&wimax_dev->mutex);
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if (wimax_dev->state <= __WIMAX_ST_QUIESCING)
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result = 0;
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else
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result = __wimax_rf_toggle_radio(wimax_dev, rf_state);
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mutex_unlock(&wimax_dev->mutex);
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d_fnend(3, dev, "(wimax_dev %p blocked %u) = %d\n",
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wimax_dev, blocked, result);
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return result;
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}
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static const struct rfkill_ops wimax_rfkill_ops = {
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.set_block = wimax_rfkill_set_radio_block,
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};
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/**
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* wimax_rfkill - Set the software RF switch state for a WiMAX device
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*
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* @wimax_dev: WiMAX device descriptor
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*
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* @state: New RF state.
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*
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* Returns:
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*
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* >= 0 toggle state if ok, < 0 errno code on error. The toggle state
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* is returned as a bitmap, bit 0 being the hardware RF state, bit 1
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* the software RF state.
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*
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* 0 means disabled (%WIMAX_RF_ON, radio on), 1 means enabled radio
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* off (%WIMAX_RF_OFF).
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*
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* Description:
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*
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* Called by the user when he wants to request the WiMAX radio to be
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* switched on (%WIMAX_RF_ON) or off (%WIMAX_RF_OFF). With
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* %WIMAX_RF_QUERY, just the current state is returned.
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*
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* NOTE:
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*
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* This call will block until the operation is complete.
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*/
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int wimax_rfkill(struct wimax_dev *wimax_dev, enum wimax_rf_state state)
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{
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int result;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
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mutex_lock(&wimax_dev->mutex);
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result = wimax_dev_is_ready(wimax_dev);
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if (result < 0) {
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/* While initializing, < 1.4.3 wimax-tools versions use
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* this call to check if the device is a valid WiMAX
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* device; so we allow it to proceed always,
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* considering the radios are all off. */
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if (result == -ENOMEDIUM && state == WIMAX_RF_QUERY)
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result = WIMAX_RF_OFF << 1 | WIMAX_RF_OFF;
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goto error_not_ready;
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}
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switch (state) {
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case WIMAX_RF_ON:
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case WIMAX_RF_OFF:
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result = __wimax_rf_toggle_radio(wimax_dev, state);
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if (result < 0)
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goto error;
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rfkill_set_sw_state(wimax_dev->rfkill, state == WIMAX_RF_OFF);
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break;
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case WIMAX_RF_QUERY:
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break;
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default:
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result = -EINVAL;
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goto error;
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}
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result = wimax_dev->rf_sw << 1 | wimax_dev->rf_hw;
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error:
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error_not_ready:
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mutex_unlock(&wimax_dev->mutex);
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d_fnend(3, dev, "(wimax_dev %p state %u) = %d\n",
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wimax_dev, state, result);
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return result;
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}
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EXPORT_SYMBOL(wimax_rfkill);
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/*
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* Register a new WiMAX device's RF Kill support
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||
|
|
*
|
||
|
|
* WARNING: wimax_dev->mutex must be unlocked
|
||
|
|
*/
|
||
|
|
int wimax_rfkill_add(struct wimax_dev *wimax_dev)
|
||
|
|
{
|
||
|
|
int result;
|
||
|
|
struct rfkill *rfkill;
|
||
|
|
struct device *dev = wimax_dev_to_dev(wimax_dev);
|
||
|
|
|
||
|
|
d_fnstart(3, dev, "(wimax_dev %p)\n", wimax_dev);
|
||
|
|
/* Initialize RF Kill */
|
||
|
|
result = -ENOMEM;
|
||
|
|
rfkill = rfkill_alloc(wimax_dev->name, dev, RFKILL_TYPE_WIMAX,
|
||
|
|
&wimax_rfkill_ops, wimax_dev);
|
||
|
|
if (rfkill == NULL)
|
||
|
|
goto error_rfkill_allocate;
|
||
|
|
|
||
|
|
d_printf(1, dev, "rfkill %p\n", rfkill);
|
||
|
|
|
||
|
|
wimax_dev->rfkill = rfkill;
|
||
|
|
|
||
|
|
rfkill_init_sw_state(rfkill, 1);
|
||
|
|
result = rfkill_register(wimax_dev->rfkill);
|
||
|
|
if (result < 0)
|
||
|
|
goto error_rfkill_register;
|
||
|
|
|
||
|
|
/* If there is no SW toggle op, SW RFKill is always on */
|
||
|
|
if (wimax_dev->op_rfkill_sw_toggle == NULL)
|
||
|
|
wimax_dev->rf_sw = WIMAX_RF_ON;
|
||
|
|
|
||
|
|
d_fnend(3, dev, "(wimax_dev %p) = 0\n", wimax_dev);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
error_rfkill_register:
|
||
|
|
rfkill_destroy(wimax_dev->rfkill);
|
||
|
|
error_rfkill_allocate:
|
||
|
|
d_fnend(3, dev, "(wimax_dev %p) = %d\n", wimax_dev, result);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Deregister a WiMAX device's RF Kill support
|
||
|
|
*
|
||
|
|
* Ick, we can't call rfkill_free() after rfkill_unregister()...oh
|
||
|
|
* well.
|
||
|
|
*
|
||
|
|
* WARNING: wimax_dev->mutex must be unlocked
|
||
|
|
*/
|
||
|
|
void wimax_rfkill_rm(struct wimax_dev *wimax_dev)
|
||
|
|
{
|
||
|
|
struct device *dev = wimax_dev_to_dev(wimax_dev);
|
||
|
|
d_fnstart(3, dev, "(wimax_dev %p)\n", wimax_dev);
|
||
|
|
rfkill_unregister(wimax_dev->rfkill);
|
||
|
|
rfkill_destroy(wimax_dev->rfkill);
|
||
|
|
d_fnend(3, dev, "(wimax_dev %p)\n", wimax_dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Exporting to user space over generic netlink
|
||
|
|
*
|
||
|
|
* Parse the rfkill command from user space, return a combination
|
||
|
|
* value that describe the states of the different toggles.
|
||
|
|
*
|
||
|
|
* Only one attribute: the new state requested (on, off or no change,
|
||
|
|
* just query).
|
||
|
|
*/
|
||
|
|
|
||
|
|
int wimax_gnl_doit_rfkill(struct sk_buff *skb, struct genl_info *info)
|
||
|
|
{
|
||
|
|
int result, ifindex;
|
||
|
|
struct wimax_dev *wimax_dev;
|
||
|
|
struct device *dev;
|
||
|
|
enum wimax_rf_state new_state;
|
||
|
|
|
||
|
|
d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
|
||
|
|
result = -ENODEV;
|
||
|
|
if (info->attrs[WIMAX_GNL_RFKILL_IFIDX] == NULL) {
|
||
|
|
pr_err("WIMAX_GNL_OP_RFKILL: can't find IFIDX attribute\n");
|
||
|
|
goto error_no_wimax_dev;
|
||
|
|
}
|
||
|
|
ifindex = nla_get_u32(info->attrs[WIMAX_GNL_RFKILL_IFIDX]);
|
||
|
|
wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
|
||
|
|
if (wimax_dev == NULL)
|
||
|
|
goto error_no_wimax_dev;
|
||
|
|
dev = wimax_dev_to_dev(wimax_dev);
|
||
|
|
result = -EINVAL;
|
||
|
|
if (info->attrs[WIMAX_GNL_RFKILL_STATE] == NULL) {
|
||
|
|
dev_err(dev, "WIMAX_GNL_RFKILL: can't find RFKILL_STATE "
|
||
|
|
"attribute\n");
|
||
|
|
goto error_no_pid;
|
||
|
|
}
|
||
|
|
new_state = nla_get_u32(info->attrs[WIMAX_GNL_RFKILL_STATE]);
|
||
|
|
|
||
|
|
/* Execute the operation and send the result back to user space */
|
||
|
|
result = wimax_rfkill(wimax_dev, new_state);
|
||
|
|
error_no_pid:
|
||
|
|
dev_put(wimax_dev->net_dev);
|
||
|
|
error_no_wimax_dev:
|
||
|
|
d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
|
||
|
|
return result;
|
||
|
|
}
|