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
phy_speed_to_led_trigger(struct phy_device * phy,unsigned int speed)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
phy_led_trigger_no_link(struct phy_device * phy)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
phy_led_trigger_change_speed(struct phy_device * phy)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
phy_led_trigger_format_name(struct phy_device * phy,char * buf,size_t size,const char * suffix)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
phy_led_trigger_register(struct phy_device * phy,struct phy_led_trigger * plt,unsigned int speed,const char * suffix)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
phy_led_trigger_unregister(struct phy_led_trigger * plt)81 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
82 {
83 led_trigger_unregister(&plt->trigger);
84 }
85
phy_led_triggers_register(struct phy_device * phy)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
phy_led_triggers_unregister(struct phy_device * phy)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