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_obj(*phy->led_link_trigger);
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 = kzalloc_objs(struct phy_led_trigger,
107 phy->phy_num_led_triggers);
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