diff options
Diffstat (limited to 'net/wimax/op-rfkill.c')
| -rw-r--r-- | net/wimax/op-rfkill.c | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/net/wimax/op-rfkill.c b/net/wimax/op-rfkill.c deleted file mode 100644 index 248d10b60b05..000000000000 --- a/net/wimax/op-rfkill.c +++ /dev/null @@ -1,431 +0,0 @@ -// 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; -} |