linux_dsm_epyc7002/net/wimax/op-rfkill.c
Thomas Gleixner 04672fe6d6 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 268
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation 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 51 franklin street fifth floor boston ma
  02110 1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 46 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141334.135501091@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:30:29 +02:00

432 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Linux WiMAX
* RF-kill framework integration
*
* Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This integrates into the Linux Kernel rfkill susbystem so that the
* drivers just have to do the bare minimal work, which is providing a
* method to set the software RF-Kill switch and to report changes in
* the software and hardware switch status.
*
* A non-polled generic rfkill device is embedded into the WiMAX
* subsystem's representation of a device.
*
* FIXME: Need polled support? Let drivers provide a poll routine
* and hand it to rfkill ops then?
*
* All device drivers have to do is after wimax_dev_init(), call
* wimax_report_rfkill_hw() and wimax_report_rfkill_sw() to update
* initial state and then every time it changes. See wimax.h:struct
* wimax_dev for more information.
*
* ROADMAP
*
* wimax_gnl_doit_rfkill() User space calling wimax_rfkill()
* wimax_rfkill() Kernel calling wimax_rfkill()
* __wimax_rf_toggle_radio()
*
* wimax_rfkill_set_radio_block() RF-Kill subsystem calling
* __wimax_rf_toggle_radio()
*
* __wimax_rf_toggle_radio()
* wimax_dev->op_rfkill_sw_toggle() Driver backend
* __wimax_state_change()
*
* wimax_report_rfkill_sw() Driver reports state change
* __wimax_state_change()
*
* wimax_report_rfkill_hw() Driver reports state change
* __wimax_state_change()
*
* wimax_rfkill_add() Initialize/shutdown rfkill support
* wimax_rfkill_rm() [called by wimax_dev_add/rm()]
*/
#include <net/wimax.h>
#include <net/genetlink.h>
#include <linux/wimax.h>
#include <linux/security.h>
#include <linux/rfkill.h>
#include <linux/export.h>
#include "wimax-internal.h"
#define D_SUBMODULE op_rfkill
#include "debug-levels.h"
/**
* wimax_report_rfkill_hw - Reports changes in the hardware RF switch
*
* @wimax_dev: WiMAX device descriptor
*
* @state: New state of the RF Kill switch. %WIMAX_RF_ON radio on,
* %WIMAX_RF_OFF radio off.
*
* When the device detects a change in the state of thehardware RF
* switch, it must call this function to let the WiMAX kernel stack
* know that the state has changed so it can be properly propagated.
*
* The WiMAX stack caches the state (the driver doesn't need to). As
* well, as the change is propagated it will come back as a request to
* change the software state to mirror the hardware state.
*
* If the device doesn't have a hardware kill switch, just report
* it on initialization as always on (%WIMAX_RF_ON, radio on).
*/
void wimax_report_rfkill_hw(struct wimax_dev *wimax_dev,
enum wimax_rf_state state)
{
int result;
struct device *dev = wimax_dev_to_dev(wimax_dev);
enum wimax_st wimax_state;
d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
BUG_ON(state == WIMAX_RF_QUERY);
BUG_ON(state != WIMAX_RF_ON && state != WIMAX_RF_OFF);
mutex_lock(&wimax_dev->mutex);
result = wimax_dev_is_ready(wimax_dev);
if (result < 0)
goto error_not_ready;
if (state != wimax_dev->rf_hw) {
wimax_dev->rf_hw = state;
if (wimax_dev->rf_hw == WIMAX_RF_ON &&
wimax_dev->rf_sw == WIMAX_RF_ON)
wimax_state = WIMAX_ST_READY;
else
wimax_state = WIMAX_ST_RADIO_OFF;
result = rfkill_set_hw_state(wimax_dev->rfkill,
state == WIMAX_RF_OFF);
__wimax_state_change(wimax_dev, wimax_state);
}
error_not_ready:
mutex_unlock(&wimax_dev->mutex);
d_fnend(3, dev, "(wimax_dev %p state %u) = void [%d]\n",
wimax_dev, state, result);
}
EXPORT_SYMBOL_GPL(wimax_report_rfkill_hw);
/**
* wimax_report_rfkill_sw - Reports changes in the software RF switch
*
* @wimax_dev: WiMAX device descriptor
*
* @state: New state of the RF kill switch. %WIMAX_RF_ON radio on,
* %WIMAX_RF_OFF radio off.
*
* Reports changes in the software RF switch state to the WiMAX stack.
*
* The main use is during initialization, so the driver can query the
* device for its current software radio kill switch state and feed it
* to the system.
*
* On the side, the device does not change the software state by
* itself. In practice, this can happen, as the device might decide to
* switch (in software) the radio off for different reasons.
*/
void wimax_report_rfkill_sw(struct wimax_dev *wimax_dev,
enum wimax_rf_state state)
{
int result;
struct device *dev = wimax_dev_to_dev(wimax_dev);
enum wimax_st wimax_state;
d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
BUG_ON(state == WIMAX_RF_QUERY);
BUG_ON(state != WIMAX_RF_ON && state != WIMAX_RF_OFF);
mutex_lock(&wimax_dev->mutex);
result = wimax_dev_is_ready(wimax_dev);
if (result < 0)
goto error_not_ready;
if (state != wimax_dev->rf_sw) {
wimax_dev->rf_sw = state;
if (wimax_dev->rf_hw == WIMAX_RF_ON &&
wimax_dev->rf_sw == WIMAX_RF_ON)
wimax_state = WIMAX_ST_READY;
else
wimax_state = WIMAX_ST_RADIO_OFF;
__wimax_state_change(wimax_dev, wimax_state);
rfkill_set_sw_state(wimax_dev->rfkill, state == WIMAX_RF_OFF);
}
error_not_ready:
mutex_unlock(&wimax_dev->mutex);
d_fnend(3, dev, "(wimax_dev %p state %u) = void [%d]\n",
wimax_dev, state, result);
}
EXPORT_SYMBOL_GPL(wimax_report_rfkill_sw);
/*
* Callback for the RF Kill toggle operation
*
* This function is called by:
*
* - The rfkill subsystem when the RF-Kill key is pressed in the
* hardware and the driver notifies through
* wimax_report_rfkill_hw(). The rfkill subsystem ends up calling back
* here so the software RF Kill switch state is changed to reflect
* the hardware switch state.
*
* - When the user sets the state through sysfs' rfkill/state file
*
* - When the user calls wimax_rfkill().
*
* This call blocks!
*
* WARNING! When we call rfkill_unregister(), this will be called with
* state 0!
*
* WARNING: wimax_dev must be locked
*/
static
int __wimax_rf_toggle_radio(struct wimax_dev *wimax_dev,
enum wimax_rf_state state)
{
int result = 0;
struct device *dev = wimax_dev_to_dev(wimax_dev);
enum wimax_st wimax_state;
might_sleep();
d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
if (wimax_dev->rf_sw == state)
goto out_no_change;
if (wimax_dev->op_rfkill_sw_toggle != NULL)
result = wimax_dev->op_rfkill_sw_toggle(wimax_dev, state);
else if (state == WIMAX_RF_OFF) /* No op? can't turn off */
result = -ENXIO;
else /* No op? can turn on */
result = 0; /* should never happen tho */
if (result >= 0) {
result = 0;
wimax_dev->rf_sw = state;
wimax_state = state == WIMAX_RF_ON ?
WIMAX_ST_READY : WIMAX_ST_RADIO_OFF;
__wimax_state_change(wimax_dev, wimax_state);
}
out_no_change:
d_fnend(3, dev, "(wimax_dev %p state %u) = %d\n",
wimax_dev, state, result);
return result;
}
/*
* Translate from rfkill state to wimax state
*
* NOTE: Special state handling rules here
*
* Just pretend the call didn't happen if we are in a state where
* we know for sure it cannot be handled (WIMAX_ST_DOWN or
* __WIMAX_ST_QUIESCING). rfkill() needs it to register and
* unregister, as it will run this path.
*
* NOTE: This call will block until the operation is completed.
*/
static int wimax_rfkill_set_radio_block(void *data, bool blocked)
{
int result;
struct wimax_dev *wimax_dev = data;
struct device *dev = wimax_dev_to_dev(wimax_dev);
enum wimax_rf_state rf_state;
d_fnstart(3, dev, "(wimax_dev %p blocked %u)\n", wimax_dev, blocked);
rf_state = WIMAX_RF_ON;
if (blocked)
rf_state = WIMAX_RF_OFF;
mutex_lock(&wimax_dev->mutex);
if (wimax_dev->state <= __WIMAX_ST_QUIESCING)
result = 0;
else
result = __wimax_rf_toggle_radio(wimax_dev, rf_state);
mutex_unlock(&wimax_dev->mutex);
d_fnend(3, dev, "(wimax_dev %p blocked %u) = %d\n",
wimax_dev, blocked, result);
return result;
}
static const struct rfkill_ops wimax_rfkill_ops = {
.set_block = wimax_rfkill_set_radio_block,
};
/**
* wimax_rfkill - Set the software RF switch state for a WiMAX device
*
* @wimax_dev: WiMAX device descriptor
*
* @state: New RF state.
*
* Returns:
*
* >= 0 toggle state if ok, < 0 errno code on error. The toggle state
* is returned as a bitmap, bit 0 being the hardware RF state, bit 1
* the software RF state.
*
* 0 means disabled (%WIMAX_RF_ON, radio on), 1 means enabled radio
* off (%WIMAX_RF_OFF).
*
* Description:
*
* Called by the user when he wants to request the WiMAX radio to be
* switched on (%WIMAX_RF_ON) or off (%WIMAX_RF_OFF). With
* %WIMAX_RF_QUERY, just the current state is returned.
*
* NOTE:
*
* This call will block until the operation is complete.
*/
int wimax_rfkill(struct wimax_dev *wimax_dev, enum wimax_rf_state state)
{
int result;
struct device *dev = wimax_dev_to_dev(wimax_dev);
d_fnstart(3, dev, "(wimax_dev %p state %u)\n", wimax_dev, state);
mutex_lock(&wimax_dev->mutex);
result = wimax_dev_is_ready(wimax_dev);
if (result < 0) {
/* While initializing, < 1.4.3 wimax-tools versions use
* this call to check if the device is a valid WiMAX
* device; so we allow it to proceed always,
* considering the radios are all off. */
if (result == -ENOMEDIUM && state == WIMAX_RF_QUERY)
result = WIMAX_RF_OFF << 1 | WIMAX_RF_OFF;
goto error_not_ready;
}
switch (state) {
case WIMAX_RF_ON:
case WIMAX_RF_OFF:
result = __wimax_rf_toggle_radio(wimax_dev, state);
if (result < 0)
goto error;
rfkill_set_sw_state(wimax_dev->rfkill, state == WIMAX_RF_OFF);
break;
case WIMAX_RF_QUERY:
break;
default:
result = -EINVAL;
goto error;
}
result = wimax_dev->rf_sw << 1 | wimax_dev->rf_hw;
error:
error_not_ready:
mutex_unlock(&wimax_dev->mutex);
d_fnend(3, dev, "(wimax_dev %p state %u) = %d\n",
wimax_dev, state, result);
return result;
}
EXPORT_SYMBOL(wimax_rfkill);
/*
* Register a new WiMAX device's RF Kill support
*
* 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;
}