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linux-next/net/mac80211/led.c
Hans de Goede e298d8a38b leds: Change led_trigger_blink[_oneshot]() delay parameters to pass-by-value 
led_blink_set[_oneshot]()'s delay_on and delay_off function parameters
are pass by reference, so that hw-blink implementations can report
back the actual achieved delays when the values have been rounded
to something the hw supports.

This is really only interesting for the sysfs API / the timer trigger.
Other triggers don't really care about this and none of the callers of
led_trigger_blink[_oneshot]() do anything with the returned delay values.

Change the led_trigger_blink[_oneshot]() delay parameters to pass-by-value,
there are 2 reasons for this:

1. led_cdev->blink_set() may sleep, while led_trigger_blink() may not.
So on hw where led_cdev->blink_set() sleeps the call needs to be deferred
to a workqueue, in which case the actual achieved delays are unknown
(this is a preparation patch for the deferring).

2. Since the callers don't care about the actual achieved delays, allowing
callers to directly pass a value leads to simpler code for most callers.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Tested-by: Yauhen Kharuzhy <jekhor@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Florian Westphal <fw@strlen.de>
Link: https://lore.kernel.org/r/20230510162234.291439-2-hdegoede@redhat.com
Signed-off-by: Lee Jones <lee@kernel.org>
2023-05-25 12:16:27 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2006, Johannes Berg <johannes@sipsolutions.net>
*/
/* just for IFNAMSIZ */
#include <linux/if.h>
#include <linux/slab.h>
#include <linux/export.h>
#include "led.h"
void ieee80211_led_assoc(struct ieee80211_local *local, bool associated)
{
if (!atomic_read(&local->assoc_led_active))
return;
if (associated)
led_trigger_event(&local->assoc_led, LED_FULL);
else
led_trigger_event(&local->assoc_led, LED_OFF);
}
void ieee80211_led_radio(struct ieee80211_local *local, bool enabled)
{
if (!atomic_read(&local->radio_led_active))
return;
if (enabled)
led_trigger_event(&local->radio_led, LED_FULL);
else
led_trigger_event(&local->radio_led, LED_OFF);
}
void ieee80211_alloc_led_names(struct ieee80211_local *local)
{
local->rx_led.name = kasprintf(GFP_KERNEL, "%srx",
wiphy_name(local->hw.wiphy));
local->tx_led.name = kasprintf(GFP_KERNEL, "%stx",
wiphy_name(local->hw.wiphy));
local->assoc_led.name = kasprintf(GFP_KERNEL, "%sassoc",
wiphy_name(local->hw.wiphy));
local->radio_led.name = kasprintf(GFP_KERNEL, "%sradio",
wiphy_name(local->hw.wiphy));
}
void ieee80211_free_led_names(struct ieee80211_local *local)
{
kfree(local->rx_led.name);
kfree(local->tx_led.name);
kfree(local->assoc_led.name);
kfree(local->radio_led.name);
}
static int ieee80211_tx_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
tx_led);
atomic_inc(&local->tx_led_active);
return 0;
}
static void ieee80211_tx_led_deactivate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
tx_led);
atomic_dec(&local->tx_led_active);
}
static int ieee80211_rx_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
rx_led);
atomic_inc(&local->rx_led_active);
return 0;
}
static void ieee80211_rx_led_deactivate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
rx_led);
atomic_dec(&local->rx_led_active);
}
static int ieee80211_assoc_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
assoc_led);
atomic_inc(&local->assoc_led_active);
return 0;
}
static void ieee80211_assoc_led_deactivate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
assoc_led);
atomic_dec(&local->assoc_led_active);
}
static int ieee80211_radio_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
radio_led);
atomic_inc(&local->radio_led_active);
return 0;
}
static void ieee80211_radio_led_deactivate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
radio_led);
atomic_dec(&local->radio_led_active);
}
static int ieee80211_tpt_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
tpt_led);
atomic_inc(&local->tpt_led_active);
return 0;
}
static void ieee80211_tpt_led_deactivate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
tpt_led);
atomic_dec(&local->tpt_led_active);
}
void ieee80211_led_init(struct ieee80211_local *local)
{
atomic_set(&local->rx_led_active, 0);
local->rx_led.activate = ieee80211_rx_led_activate;
local->rx_led.deactivate = ieee80211_rx_led_deactivate;
if (local->rx_led.name && led_trigger_register(&local->rx_led)) {
kfree(local->rx_led.name);
local->rx_led.name = NULL;
}
atomic_set(&local->tx_led_active, 0);
local->tx_led.activate = ieee80211_tx_led_activate;
local->tx_led.deactivate = ieee80211_tx_led_deactivate;
if (local->tx_led.name && led_trigger_register(&local->tx_led)) {
kfree(local->tx_led.name);
local->tx_led.name = NULL;
}
atomic_set(&local->assoc_led_active, 0);
local->assoc_led.activate = ieee80211_assoc_led_activate;
local->assoc_led.deactivate = ieee80211_assoc_led_deactivate;
if (local->assoc_led.name && led_trigger_register(&local->assoc_led)) {
kfree(local->assoc_led.name);
local->assoc_led.name = NULL;
}
atomic_set(&local->radio_led_active, 0);
local->radio_led.activate = ieee80211_radio_led_activate;
local->radio_led.deactivate = ieee80211_radio_led_deactivate;
if (local->radio_led.name && led_trigger_register(&local->radio_led)) {
kfree(local->radio_led.name);
local->radio_led.name = NULL;
}
atomic_set(&local->tpt_led_active, 0);
if (local->tpt_led_trigger) {
local->tpt_led.activate = ieee80211_tpt_led_activate;
local->tpt_led.deactivate = ieee80211_tpt_led_deactivate;
if (led_trigger_register(&local->tpt_led)) {
kfree(local->tpt_led_trigger);
local->tpt_led_trigger = NULL;
}
}
}
void ieee80211_led_exit(struct ieee80211_local *local)
{
if (local->radio_led.name)
led_trigger_unregister(&local->radio_led);
if (local->assoc_led.name)
led_trigger_unregister(&local->assoc_led);
if (local->tx_led.name)
led_trigger_unregister(&local->tx_led);
if (local->rx_led.name)
led_trigger_unregister(&local->rx_led);
if (local->tpt_led_trigger) {
led_trigger_unregister(&local->tpt_led);
kfree(local->tpt_led_trigger);
}
}
const char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
return local->radio_led.name;
}
EXPORT_SYMBOL(__ieee80211_get_radio_led_name);
const char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
return local->assoc_led.name;
}
EXPORT_SYMBOL(__ieee80211_get_assoc_led_name);
const char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
return local->tx_led.name;
}
EXPORT_SYMBOL(__ieee80211_get_tx_led_name);
const char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
return local->rx_led.name;
}
EXPORT_SYMBOL(__ieee80211_get_rx_led_name);
static unsigned long tpt_trig_traffic(struct ieee80211_local *local,
struct tpt_led_trigger *tpt_trig)
{
unsigned long traffic, delta;
traffic = tpt_trig->tx_bytes + tpt_trig->rx_bytes;
delta = traffic - tpt_trig->prev_traffic;
tpt_trig->prev_traffic = traffic;
return DIV_ROUND_UP(delta, 1024 / 8);
}
static void tpt_trig_timer(struct timer_list *t)
{
struct tpt_led_trigger *tpt_trig = from_timer(tpt_trig, t, timer);
struct ieee80211_local *local = tpt_trig->local;
unsigned long on, off, tpt;
int i;
if (!tpt_trig->running)
return;
mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
tpt = tpt_trig_traffic(local, tpt_trig);
/* default to just solid on */
on = 1;
off = 0;
for (i = tpt_trig->blink_table_len - 1; i >= 0; i--) {
if (tpt_trig->blink_table[i].throughput < 0 ||
tpt > tpt_trig->blink_table[i].throughput) {
off = tpt_trig->blink_table[i].blink_time / 2;
on = tpt_trig->blink_table[i].blink_time - off;
break;
}
}
led_trigger_blink(&local->tpt_led, on, off);
}
const char *
__ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw,
unsigned int flags,
const struct ieee80211_tpt_blink *blink_table,
unsigned int blink_table_len)
{
struct ieee80211_local *local = hw_to_local(hw);
struct tpt_led_trigger *tpt_trig;
if (WARN_ON(local->tpt_led_trigger))
return NULL;
tpt_trig = kzalloc(sizeof(struct tpt_led_trigger), GFP_KERNEL);
if (!tpt_trig)
return NULL;
snprintf(tpt_trig->name, sizeof(tpt_trig->name),
"%stpt", wiphy_name(local->hw.wiphy));
local->tpt_led.name = tpt_trig->name;
tpt_trig->blink_table = blink_table;
tpt_trig->blink_table_len = blink_table_len;
tpt_trig->want = flags;
tpt_trig->local = local;
timer_setup(&tpt_trig->timer, tpt_trig_timer, 0);
local->tpt_led_trigger = tpt_trig;
return tpt_trig->name;
}
EXPORT_SYMBOL(__ieee80211_create_tpt_led_trigger);
static void ieee80211_start_tpt_led_trig(struct ieee80211_local *local)
{
struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
if (tpt_trig->running)
return;
/* reset traffic */
tpt_trig_traffic(local, tpt_trig);
tpt_trig->running = true;
tpt_trig_timer(&tpt_trig->timer);
mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
}
static void ieee80211_stop_tpt_led_trig(struct ieee80211_local *local)
{
struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
if (!tpt_trig->running)
return;
tpt_trig->running = false;
del_timer_sync(&tpt_trig->timer);
led_trigger_event(&local->tpt_led, LED_OFF);
}
void ieee80211_mod_tpt_led_trig(struct ieee80211_local *local,
unsigned int types_on, unsigned int types_off)
{
struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
bool allowed;
WARN_ON(types_on & types_off);
if (!tpt_trig)
return;
tpt_trig->active &= ~types_off;
tpt_trig->active |= types_on;
/*
* Regardless of wanted state, we shouldn't blink when
* the radio is disabled -- this can happen due to some
* code ordering issues with __ieee80211_recalc_idle()
* being called before the radio is started.
*/
allowed = tpt_trig->active & IEEE80211_TPT_LEDTRIG_FL_RADIO;
if (!allowed || !(tpt_trig->active & tpt_trig->want))
ieee80211_stop_tpt_led_trig(local);
else
ieee80211_start_tpt_led_trig(local);
}
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