phy_led_triggers.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/* Copyright (C) 2016 National Instruments Corp. */
  3#include <linux/leds.h>
  4#include <linux/phy.h>
  5#include <linux/phy_led_triggers.h>
  6#include <linux/netdevice.h>
  7
  8#include "phylib-internal.h"
  9
 10static struct phy_led_trigger *phy_speed_to_led_trigger(struct phy_device *phy,
 11							unsigned int speed)
 12{
 13	unsigned int i;
 14
 15	for (i = 0; i < phy->phy_num_led_triggers; i++) {
 16		if (phy->phy_led_triggers[i].speed == speed)
 17			return &phy->phy_led_triggers[i];
 18	}
 19	return NULL;
 20}
 21
 22static void phy_led_trigger_no_link(struct phy_device *phy)
 23{
 24	if (phy->last_triggered) {
 25		led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
 26		led_trigger_event(&phy->led_link_trigger->trigger, LED_OFF);
 27		phy->last_triggered = NULL;
 28	}
 29}
 30
 31void phy_led_trigger_change_speed(struct phy_device *phy)
 32{
 33	struct phy_led_trigger *plt;
 34
 35	if (!phy->link)
 36		return phy_led_trigger_no_link(phy);
 37
 38	if (phy->speed == 0)
 39		return;
 40
 41	plt = phy_speed_to_led_trigger(phy, phy->speed);
 42	if (!plt) {
 43		netdev_alert(phy->attached_dev,
 44			     "No phy led trigger registered for speed(%d)\n",
 45			     phy->speed);
 46		return phy_led_trigger_no_link(phy);
 47	}
 48
 49	if (plt != phy->last_triggered) {
 50		if (!phy->last_triggered)
 51			led_trigger_event(&phy->led_link_trigger->trigger,
 52					  LED_FULL);
 53		else
 54			led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
 55
 56		led_trigger_event(&plt->trigger, LED_FULL);
 57		phy->last_triggered = plt;
 58	}
 59}
 60EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
 61
 62static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
 63					size_t size, const char *suffix)
 64{
 65	snprintf(buf, size, PHY_ID_FMT ":%s",
 66		 phy->mdio.bus->id, phy->mdio.addr, suffix);
 67}
 68
 69static int phy_led_trigger_register(struct phy_device *phy,
 70				    struct phy_led_trigger *plt,
 71				    unsigned int speed,
 72				    const char *suffix)
 73{
 74	plt->speed = speed;
 75	phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name), suffix);
 76	plt->trigger.name = plt->name;
 77
 78	return led_trigger_register(&plt->trigger);
 79}
 80
 81static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
 82{
 83	led_trigger_unregister(&plt->trigger);
 84}
 85
 86int phy_led_triggers_register(struct phy_device *phy)
 87{
 88	int i, err;
 89	unsigned int speeds[50];
 90
 91	phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
 92							 ARRAY_SIZE(speeds));
 93	if (!phy->phy_num_led_triggers)
 94		return 0;
 95
 96	phy->led_link_trigger = kzalloc(sizeof(*phy->led_link_trigger),
 97					GFP_KERNEL);
 98	if (!phy->led_link_trigger) {
 99		err = -ENOMEM;
100		goto out_clear;
101	}
102
103	err = phy_led_trigger_register(phy, phy->led_link_trigger, 0, "link");
104	if (err)
105		goto out_free_link;
106
107	phy->phy_led_triggers = kcalloc(phy->phy_num_led_triggers,
108					sizeof(struct phy_led_trigger),
109					GFP_KERNEL);
110	if (!phy->phy_led_triggers) {
111		err = -ENOMEM;
112		goto out_unreg_link;
113	}
114
115	for (i = 0; i < phy->phy_num_led_triggers; i++) {
116		err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
117					       speeds[i],
118					       phy_speed_to_str(speeds[i]));
119		if (err)
120			goto out_unreg;
121	}
122
123	phy->last_triggered = NULL;
124	phy_led_trigger_change_speed(phy);
125
126	return 0;
127out_unreg:
128	while (i--)
129		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
130	kfree(phy->phy_led_triggers);
131out_unreg_link:
132	phy_led_trigger_unregister(phy->led_link_trigger);
133out_free_link:
134	kfree(phy->led_link_trigger);
135	phy->led_link_trigger = NULL;
136out_clear:
137	phy->phy_num_led_triggers = 0;
138	return err;
139}
140EXPORT_SYMBOL_GPL(phy_led_triggers_register);
141
142void phy_led_triggers_unregister(struct phy_device *phy)
143{
144	int i;
145
146	for (i = 0; i < phy->phy_num_led_triggers; i++)
147		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
148	kfree(phy->phy_led_triggers);
149	phy->phy_led_triggers = NULL;
150
151	if (phy->led_link_trigger) {
152		phy_led_trigger_unregister(phy->led_link_trigger);
153		kfree(phy->led_link_trigger);
154		phy->led_link_trigger = NULL;
155	}
156}
157EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);