linux/drivers/net/phy/phy_led_triggers.c
Maciej S. Szmigiero 3928ee6485 net: phy: leds: Add support for "link" trigger
Currently, we create a LED trigger for any link speed known to a PHY.
These triggers only fire when their exact link speed had been negotiated
(they aren't cumulative, that is, they don't fire for "their or any higher"
link speed).

What we are missing, however, is a trigger which will fire on any link
speed known to the PHY. Such trigger can then be used for implementing a
poor man's substitute of the "link" LED on boards that lack it.
Let's add it.

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 10:24:14 +09:00

177 lines
4.7 KiB
C

/* Copyright (C) 2016 National Instruments Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#include <linux/leds.h>
#include <linux/phy.h>
#include <linux/phy_led_triggers.h>
#include <linux/netdevice.h>
static struct phy_led_trigger *phy_speed_to_led_trigger(struct phy_device *phy,
unsigned int speed)
{
unsigned int i;
for (i = 0; i < phy->phy_num_led_triggers; i++) {
if (phy->phy_led_triggers[i].speed == speed)
return &phy->phy_led_triggers[i];
}
return NULL;
}
static void phy_led_trigger_no_link(struct phy_device *phy)
{
if (phy->last_triggered) {
led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
led_trigger_event(&phy->led_link_trigger->trigger, LED_OFF);
phy->last_triggered = NULL;
}
}
void phy_led_trigger_change_speed(struct phy_device *phy)
{
struct phy_led_trigger *plt;
if (!phy->link)
return phy_led_trigger_no_link(phy);
if (phy->speed == 0)
return;
plt = phy_speed_to_led_trigger(phy, phy->speed);
if (!plt) {
netdev_alert(phy->attached_dev,
"No phy led trigger registered for speed(%d)\n",
phy->speed);
return phy_led_trigger_no_link(phy);
}
if (plt != phy->last_triggered) {
if (!phy->last_triggered)
led_trigger_event(&phy->led_link_trigger->trigger,
LED_FULL);
led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
led_trigger_event(&plt->trigger, LED_FULL);
phy->last_triggered = plt;
}
}
EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
size_t size, char *suffix)
{
snprintf(buf, size, PHY_ID_FMT ":%s",
phy->mdio.bus->id, phy->mdio.addr, suffix);
}
static int phy_led_trigger_register(struct phy_device *phy,
struct phy_led_trigger *plt,
unsigned int speed)
{
char name_suffix[PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE];
plt->speed = speed;
if (speed < SPEED_1000)
snprintf(name_suffix, sizeof(name_suffix), "%dMbps", speed);
else if (speed == SPEED_2500)
snprintf(name_suffix, sizeof(name_suffix), "2.5Gbps");
else
snprintf(name_suffix, sizeof(name_suffix), "%dGbps",
DIV_ROUND_CLOSEST(speed, 1000));
phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
name_suffix);
plt->trigger.name = plt->name;
return led_trigger_register(&plt->trigger);
}
static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
{
led_trigger_unregister(&plt->trigger);
}
int phy_led_triggers_register(struct phy_device *phy)
{
int i, err;
unsigned int speeds[50];
phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
ARRAY_SIZE(speeds));
if (!phy->phy_num_led_triggers)
return 0;
phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
sizeof(*phy->led_link_trigger),
GFP_KERNEL);
if (!phy->led_link_trigger) {
err = -ENOMEM;
goto out_clear;
}
phy_led_trigger_format_name(phy, phy->led_link_trigger->name,
sizeof(phy->led_link_trigger->name),
"link");
phy->led_link_trigger->trigger.name = phy->led_link_trigger->name;
err = led_trigger_register(&phy->led_link_trigger->trigger);
if (err)
goto out_free_link;
phy->phy_led_triggers = devm_kzalloc(&phy->mdio.dev,
sizeof(struct phy_led_trigger) *
phy->phy_num_led_triggers,
GFP_KERNEL);
if (!phy->phy_led_triggers) {
err = -ENOMEM;
goto out_unreg_link;
}
for (i = 0; i < phy->phy_num_led_triggers; i++) {
err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
speeds[i]);
if (err)
goto out_unreg;
}
phy->last_triggered = NULL;
phy_led_trigger_change_speed(phy);
return 0;
out_unreg:
while (i--)
phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
out_unreg_link:
phy_led_trigger_unregister(phy->led_link_trigger);
out_free_link:
devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
phy->led_link_trigger = NULL;
out_clear:
phy->phy_num_led_triggers = 0;
return err;
}
EXPORT_SYMBOL_GPL(phy_led_triggers_register);
void phy_led_triggers_unregister(struct phy_device *phy)
{
int i;
for (i = 0; i < phy->phy_num_led_triggers; i++)
phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
if (phy->led_link_trigger)
phy_led_trigger_unregister(phy->led_link_trigger);
}
EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);