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/*
* Linux WiMax
* Export the kernel's WiMAX stack wimaxll_rfkill() function
*
*
* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <assert.h>
#include <linux/types.h>
#include <netlink/msg.h>
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <wimaxll.h>
#include "internal.h"
#define D_LOCAL 0
#include "debug.h"
/**
* Control the software RF Kill switch and obtain switch status
*
* \param wmx WiMAX device handle
*
* \param state State to which you want to toggle the sofware RF Kill
* switch (%WIMAX_RF_ON, %WIMAX_RF_OFF or %WIMAX_RF_QUERY for just
* querying the current state of the hardware and software
* switches).
*
* \return Negative errno code on error. Otherwise, radio kill switch
* status (bit 0 \e hw switch, bit 1 \e sw switch, \e 0 OFF, \e 1
* ON):
* - 3 @c 0b11: Both HW and SW switches are \e on, radio is \e on
* - 2 @c 0b10: HW switch is \e off, radio is \e off
* - 1 @c 0b01: SW switch is \e on, radio is \e off
* - 0 @c 0b00: Both HW and SW switches are \e off, radio is \e off
*
* Allows the caller to control the state of the software RF Kill
* switch (if present) and in return, obtain the current status of
* both the hardware and software RF Kill switches.
*
* If there is no hardware or software switch, that switch is assumed
* to be always on (radio on).
*
* Changing the radio state might cause the device to change state,
* and cause the kernel to send reports indicating so.
*
* \note The state of the radio (\e ON or \e OFF) is the inverse of
* the state of the RF-Kill switch (\e enabled/on kills the
* radio, radio \e off; \e disabled/off allows the radio to
* work, radio \e on).
*
* \ingroup device_management
* \internal
*
* This implementation simply marshalls the call to the kernel's
* wimax_rfkill() and returns it's return code.
*/
int wimaxll_rfkill(struct wimaxll_handle *wmx, enum wimax_rf_state state)
{
ssize_t result;
struct nl_msg *msg;
d_fnstart(3, wmx, "(wmx %p state %u)\n", wmx, state);
result = -EBADF;
if (wmx->ifidx == 0)
goto error_not_any;
msg = nlmsg_new();
if (msg == NULL) {
result = errno;
wimaxll_msg(wmx, "E: RFKILL: cannot allocate generic netlink "
"message: %m\n");
goto error_msg_alloc;
}
if (genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ,
wimaxll_family_id(wmx), 0, 0,
WIMAX_GNL_OP_RFKILL, WIMAX_GNL_VERSION) == NULL) {
result = -ENOMEM;
wimaxll_msg(wmx, "E: RFKILL: error preparing message: "
"%d 0x%08x\n", result, result);
goto error_msg_prep;
}
nla_put_u32(msg, WIMAX_GNL_RFKILL_IFIDX, (__u32) wmx->ifidx);
nla_put_u32(msg, WIMAX_GNL_RFKILL_STATE, (__u32) state);
result = nl_send_auto_complete(wmx->nlh_tx, msg);
if (result < 0) {
wimaxll_msg(wmx, "E: RFKILL: error sending message: %zd\n",
result);
goto error_msg_send;
}
/* Read the message ACK from netlink */
result = wimaxll_wait_for_ack(wmx);
if (result < 0 && result != -ENODEV)
wimaxll_msg(wmx, "E: RFKILL: operation failed: %zd\n", result);
error_msg_prep:
error_msg_send:
nlmsg_free(msg);
error_msg_alloc:
error_not_any:
d_fnend(3, wmx, "(wmx %p state %u) = %d\n", wmx, state, result);
return result;
}
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