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 
10 static 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 
22 static 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 
31 void 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 }
60 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
61 
62 static 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 
69 static 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 
81 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
82 {
83 	led_trigger_unregister(&plt->trigger);
84 }
85 
86 int 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;
127 out_unreg:
128 	while (i--)
129 		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
130 	kfree(phy->phy_led_triggers);
131 out_unreg_link:
132 	phy_led_trigger_unregister(phy->led_link_trigger);
133 out_free_link:
134 	kfree(phy->led_link_trigger);
135 	phy->led_link_trigger = NULL;
136 out_clear:
137 	phy->phy_num_led_triggers = 0;
138 	return err;
139 }
140 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
141 
142 void 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 }
157 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);
158