1 /* Copyright (C) 2016 National Instruments Corp.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13 #include <linux/leds.h>
14 #include <linux/phy.h>
15 #include <linux/phy_led_triggers.h>
16 #include <linux/netdevice.h>
17
phy_speed_to_led_trigger(struct phy_device * phy,unsigned int speed)18 static struct phy_led_trigger *phy_speed_to_led_trigger(struct phy_device *phy,
19 unsigned int speed)
20 {
21 unsigned int i;
22
23 for (i = 0; i < phy->phy_num_led_triggers; i++) {
24 if (phy->phy_led_triggers[i].speed == speed)
25 return &phy->phy_led_triggers[i];
26 }
27 return NULL;
28 }
29
phy_led_trigger_no_link(struct phy_device * phy)30 static void phy_led_trigger_no_link(struct phy_device *phy)
31 {
32 if (phy->last_triggered) {
33 led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
34 led_trigger_event(&phy->led_link_trigger->trigger, LED_OFF);
35 phy->last_triggered = NULL;
36 }
37 }
38
phy_led_trigger_change_speed(struct phy_device * phy)39 void phy_led_trigger_change_speed(struct phy_device *phy)
40 {
41 struct phy_led_trigger *plt;
42
43 if (!phy->link)
44 return phy_led_trigger_no_link(phy);
45
46 if (phy->speed == 0)
47 return;
48
49 plt = phy_speed_to_led_trigger(phy, phy->speed);
50 if (!plt) {
51 netdev_alert(phy->attached_dev,
52 "No phy led trigger registered for speed(%d)\n",
53 phy->speed);
54 return phy_led_trigger_no_link(phy);
55 }
56
57 if (plt != phy->last_triggered) {
58 if (!phy->last_triggered)
59 led_trigger_event(&phy->led_link_trigger->trigger,
60 LED_FULL);
61
62 led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
63 led_trigger_event(&plt->trigger, LED_FULL);
64 phy->last_triggered = plt;
65 }
66 }
67 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
68
phy_led_trigger_format_name(struct phy_device * phy,char * buf,size_t size,char * suffix)69 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
70 size_t size, char *suffix)
71 {
72 snprintf(buf, size, PHY_ID_FMT ":%s",
73 phy->mdio.bus->id, phy->mdio.addr, suffix);
74 }
75
phy_led_trigger_register(struct phy_device * phy,struct phy_led_trigger * plt,unsigned int speed)76 static int phy_led_trigger_register(struct phy_device *phy,
77 struct phy_led_trigger *plt,
78 unsigned int speed)
79 {
80 char name_suffix[PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE];
81
82 plt->speed = speed;
83
84 if (speed < SPEED_1000)
85 snprintf(name_suffix, sizeof(name_suffix), "%dMbps", speed);
86 else if (speed == SPEED_2500)
87 snprintf(name_suffix, sizeof(name_suffix), "2.5Gbps");
88 else
89 snprintf(name_suffix, sizeof(name_suffix), "%dGbps",
90 DIV_ROUND_CLOSEST(speed, 1000));
91
92 phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
93 name_suffix);
94 plt->trigger.name = plt->name;
95
96 return led_trigger_register(&plt->trigger);
97 }
98
phy_led_trigger_unregister(struct phy_led_trigger * plt)99 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
100 {
101 led_trigger_unregister(&plt->trigger);
102 }
103
phy_led_triggers_register(struct phy_device * phy)104 int phy_led_triggers_register(struct phy_device *phy)
105 {
106 int i, err;
107 unsigned int speeds[50];
108
109 phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
110 ARRAY_SIZE(speeds));
111 if (!phy->phy_num_led_triggers)
112 return 0;
113
114 phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
115 sizeof(*phy->led_link_trigger),
116 GFP_KERNEL);
117 if (!phy->led_link_trigger) {
118 err = -ENOMEM;
119 goto out_clear;
120 }
121
122 phy_led_trigger_format_name(phy, phy->led_link_trigger->name,
123 sizeof(phy->led_link_trigger->name),
124 "link");
125 phy->led_link_trigger->trigger.name = phy->led_link_trigger->name;
126
127 err = led_trigger_register(&phy->led_link_trigger->trigger);
128 if (err)
129 goto out_free_link;
130
131 phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
132 phy->phy_num_led_triggers,
133 sizeof(struct phy_led_trigger),
134 GFP_KERNEL);
135 if (!phy->phy_led_triggers) {
136 err = -ENOMEM;
137 goto out_unreg_link;
138 }
139
140 for (i = 0; i < phy->phy_num_led_triggers; i++) {
141 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
142 speeds[i]);
143 if (err)
144 goto out_unreg;
145 }
146
147 phy->last_triggered = NULL;
148 phy_led_trigger_change_speed(phy);
149
150 return 0;
151 out_unreg:
152 while (i--)
153 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
154 devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
155 out_unreg_link:
156 phy_led_trigger_unregister(phy->led_link_trigger);
157 out_free_link:
158 devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
159 phy->led_link_trigger = NULL;
160 out_clear:
161 phy->phy_num_led_triggers = 0;
162 return err;
163 }
164 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
165
phy_led_triggers_unregister(struct phy_device * phy)166 void phy_led_triggers_unregister(struct phy_device *phy)
167 {
168 int i;
169
170 for (i = 0; i < phy->phy_num_led_triggers; i++)
171 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
172
173 if (phy->led_link_trigger)
174 phy_led_trigger_unregister(phy->led_link_trigger);
175 }
176 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);
177
