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
8static struct phy_led_trigger *phy_speed_to_led_trigger(struct phy_device *phy,
9							unsigned int speed)
10{
11	unsigned int i;
12
13	for (i = 0; i < phy->phy_num_led_triggers; i++) {
14		if (phy->phy_led_triggers[i].speed == speed)
15			return &phy->phy_led_triggers[i];
16	}
17	return NULL;
18}
19
20static void phy_led_trigger_no_link(struct phy_device *phy)
21{
22	if (phy->last_triggered) {
23		led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
24		led_trigger_event(&phy->led_link_trigger->trigger, LED_OFF);
25		phy->last_triggered = NULL;
26	}
27}
28
29void phy_led_trigger_change_speed(struct phy_device *phy)
30{
31	struct phy_led_trigger *plt;
32
33	if (!phy->link)
34		return phy_led_trigger_no_link(phy);
35
36	if (phy->speed == 0)
37		return;
38
39	plt = phy_speed_to_led_trigger(phy, phy->speed);
40	if (!plt) {
41		netdev_alert(phy->attached_dev,
42			     "No phy led trigger registered for speed(%d)\n",
43			     phy->speed);
44		return phy_led_trigger_no_link(phy);
45	}
46
47	if (plt != phy->last_triggered) {
48		if (!phy->last_triggered)
49			led_trigger_event(&phy->led_link_trigger->trigger,
50					  LED_FULL);
51		else
52			led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
53
54		led_trigger_event(&plt->trigger, LED_FULL);
55		phy->last_triggered = plt;
56	}
57}
58EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
59
60static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
61					size_t size, const char *suffix)
62{
63	snprintf(buf, size, PHY_ID_FMT ":%s",
64		 phy->mdio.bus->id, phy->mdio.addr, suffix);
65}
66
67static int phy_led_trigger_register(struct phy_device *phy,
68				    struct phy_led_trigger *plt,
69				    unsigned int speed,
70				    const char *suffix)
71{
72	plt->speed = speed;
73	phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name), suffix);
74	plt->trigger.name = plt->name;
75
76	return led_trigger_register(&plt->trigger);
77}
78
79static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
80{
81	led_trigger_unregister(&plt->trigger);
82}
83
84int phy_led_triggers_register(struct phy_device *phy)
85{
86	int i, err;
87	unsigned int speeds[50];
88
89	phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
90							 ARRAY_SIZE(speeds));
91	if (!phy->phy_num_led_triggers)
92		return 0;
93
94	phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
95					     sizeof(*phy->led_link_trigger),
96					     GFP_KERNEL);
97	if (!phy->led_link_trigger) {
98		err = -ENOMEM;
99		goto out_clear;
100	}
101
102	err = phy_led_trigger_register(phy, phy->led_link_trigger, 0, "link");
103	if (err)
104		goto out_free_link;
105
106	phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
107					    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	devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
131out_unreg_link:
132	phy_led_trigger_unregister(phy->led_link_trigger);
133out_free_link:
134	devm_kfree(&phy->mdio.dev, 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
149	if (phy->led_link_trigger)
150		phy_led_trigger_unregister(phy->led_link_trigger);
151}
152EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);
153