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 static 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 
20 static 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 
29 void 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 
52 		led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
53 		led_trigger_event(&plt->trigger, LED_FULL);
54 		phy->last_triggered = plt;
55 	}
56 }
57 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
58 
59 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
60 					size_t size, const char *suffix)
61 {
62 	snprintf(buf, size, PHY_ID_FMT ":%s",
63 		 phy->mdio.bus->id, phy->mdio.addr, suffix);
64 }
65 
66 static int phy_led_trigger_register(struct phy_device *phy,
67 				    struct phy_led_trigger *plt,
68 				    unsigned int speed)
69 {
70 	plt->speed = speed;
71 	phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
72 				    phy_speed_to_str(speed));
73 	plt->trigger.name = plt->name;
74 
75 	return led_trigger_register(&plt->trigger);
76 }
77 
78 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
79 {
80 	led_trigger_unregister(&plt->trigger);
81 }
82 
83 int phy_led_triggers_register(struct phy_device *phy)
84 {
85 	int i, err;
86 	unsigned int speeds[50];
87 
88 	phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
89 							 ARRAY_SIZE(speeds));
90 	if (!phy->phy_num_led_triggers)
91 		return 0;
92 
93 	phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
94 					     sizeof(*phy->led_link_trigger),
95 					     GFP_KERNEL);
96 	if (!phy->led_link_trigger) {
97 		err = -ENOMEM;
98 		goto out_clear;
99 	}
100 
101 	phy_led_trigger_format_name(phy, phy->led_link_trigger->name,
102 				    sizeof(phy->led_link_trigger->name),
103 				    "link");
104 	phy->led_link_trigger->trigger.name = phy->led_link_trigger->name;
105 
106 	err = led_trigger_register(&phy->led_link_trigger->trigger);
107 	if (err)
108 		goto out_free_link;
109 
110 	phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
111 					    phy->phy_num_led_triggers,
112 					    sizeof(struct phy_led_trigger),
113 					    GFP_KERNEL);
114 	if (!phy->phy_led_triggers) {
115 		err = -ENOMEM;
116 		goto out_unreg_link;
117 	}
118 
119 	for (i = 0; i < phy->phy_num_led_triggers; i++) {
120 		err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
121 					       speeds[i]);
122 		if (err)
123 			goto out_unreg;
124 	}
125 
126 	phy->last_triggered = NULL;
127 	phy_led_trigger_change_speed(phy);
128 
129 	return 0;
130 out_unreg:
131 	while (i--)
132 		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
133 	devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
134 out_unreg_link:
135 	phy_led_trigger_unregister(phy->led_link_trigger);
136 out_free_link:
137 	devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
138 	phy->led_link_trigger = NULL;
139 out_clear:
140 	phy->phy_num_led_triggers = 0;
141 	return err;
142 }
143 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
144 
145 void phy_led_triggers_unregister(struct phy_device *phy)
146 {
147 	int i;
148 
149 	for (i = 0; i < phy->phy_num_led_triggers; i++)
150 		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
151 
152 	if (phy->led_link_trigger)
153 		phy_led_trigger_unregister(phy->led_link_trigger);
154 }
155 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);
156