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
phy_speed_to_led_trigger(struct phy_device * phy,unsigned int speed)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
phy_led_trigger_no_link(struct phy_device * phy)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
phy_led_trigger_change_speed(struct phy_device * phy)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 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 }
58 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
59
phy_led_trigger_format_name(struct phy_device * phy,char * buf,size_t size,const char * suffix)60 static 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
phy_led_trigger_register(struct phy_device * phy,struct phy_led_trigger * plt,unsigned int speed,const char * suffix)67 static 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
phy_led_trigger_unregister(struct phy_led_trigger * plt)79 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
80 {
81 led_trigger_unregister(&plt->trigger);
82 }
83
phy_led_triggers_register(struct phy_device * phy)84 int 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 = kzalloc(sizeof(*phy->led_link_trigger),
95 GFP_KERNEL);
96 if (!phy->led_link_trigger) {
97 err = -ENOMEM;
98 goto out_clear;
99 }
100
101 err = phy_led_trigger_register(phy, phy->led_link_trigger, 0, "link");
102 if (err)
103 goto out_free_link;
104
105 phy->phy_led_triggers = kcalloc(phy->phy_num_led_triggers,
106 sizeof(struct phy_led_trigger),
107 GFP_KERNEL);
108 if (!phy->phy_led_triggers) {
109 err = -ENOMEM;
110 goto out_unreg_link;
111 }
112
113 for (i = 0; i < phy->phy_num_led_triggers; i++) {
114 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
115 speeds[i],
116 phy_speed_to_str(speeds[i]));
117 if (err)
118 goto out_unreg;
119 }
120
121 phy->last_triggered = NULL;
122 phy_led_trigger_change_speed(phy);
123
124 return 0;
125 out_unreg:
126 while (i--)
127 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
128 kfree(phy->phy_led_triggers);
129 out_unreg_link:
130 phy_led_trigger_unregister(phy->led_link_trigger);
131 out_free_link:
132 kfree(phy->led_link_trigger);
133 phy->led_link_trigger = NULL;
134 out_clear:
135 phy->phy_num_led_triggers = 0;
136 return err;
137 }
138 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
139
phy_led_triggers_unregister(struct phy_device * phy)140 void phy_led_triggers_unregister(struct phy_device *phy)
141 {
142 int i;
143
144 for (i = 0; i < phy->phy_num_led_triggers; i++)
145 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
146 kfree(phy->phy_led_triggers);
147 phy->phy_led_triggers = NULL;
148
149 if (phy->led_link_trigger) {
150 phy_led_trigger_unregister(phy->led_link_trigger);
151 kfree(phy->led_link_trigger);
152 phy->led_link_trigger = NULL;
153 }
154 }
155 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);
156