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/* 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_kcalloc(&phy->mdio.dev,
phy->phy_num_led_triggers,
sizeof(struct phy_led_trigger),
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);
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