GNU Linux-libre 4.19.314-gnu1
[releases.git] / drivers / net / phy / phy_led_triggers.c
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
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
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
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                 else
62                         led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
63
64                 led_trigger_event(&plt->trigger, LED_FULL);
65                 phy->last_triggered = plt;
66         }
67 }
68 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
69
70 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
71                                         size_t size, char *suffix)
72 {
73         snprintf(buf, size, PHY_ID_FMT ":%s",
74                  phy->mdio.bus->id, phy->mdio.addr, suffix);
75 }
76
77 static int phy_led_trigger_register(struct phy_device *phy,
78                                     struct phy_led_trigger *plt,
79                                     unsigned int speed)
80 {
81         char name_suffix[PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE];
82
83         plt->speed = speed;
84
85         if (speed < SPEED_1000)
86                 snprintf(name_suffix, sizeof(name_suffix), "%dMbps", speed);
87         else if (speed == SPEED_2500)
88                 snprintf(name_suffix, sizeof(name_suffix), "2.5Gbps");
89         else
90                 snprintf(name_suffix, sizeof(name_suffix), "%dGbps",
91                          DIV_ROUND_CLOSEST(speed, 1000));
92
93         phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
94                                     name_suffix);
95         plt->trigger.name = plt->name;
96
97         return led_trigger_register(&plt->trigger);
98 }
99
100 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
101 {
102         led_trigger_unregister(&plt->trigger);
103 }
104
105 int phy_led_triggers_register(struct phy_device *phy)
106 {
107         int i, err;
108         unsigned int speeds[50];
109
110         phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
111                                                          ARRAY_SIZE(speeds));
112         if (!phy->phy_num_led_triggers)
113                 return 0;
114
115         phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
116                                              sizeof(*phy->led_link_trigger),
117                                              GFP_KERNEL);
118         if (!phy->led_link_trigger) {
119                 err = -ENOMEM;
120                 goto out_clear;
121         }
122
123         phy_led_trigger_format_name(phy, phy->led_link_trigger->name,
124                                     sizeof(phy->led_link_trigger->name),
125                                     "link");
126         phy->led_link_trigger->trigger.name = phy->led_link_trigger->name;
127
128         err = led_trigger_register(&phy->led_link_trigger->trigger);
129         if (err)
130                 goto out_free_link;
131
132         phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
133                                             phy->phy_num_led_triggers,
134                                             sizeof(struct phy_led_trigger),
135                                             GFP_KERNEL);
136         if (!phy->phy_led_triggers) {
137                 err = -ENOMEM;
138                 goto out_unreg_link;
139         }
140
141         for (i = 0; i < phy->phy_num_led_triggers; i++) {
142                 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
143                                                speeds[i]);
144                 if (err)
145                         goto out_unreg;
146         }
147
148         phy->last_triggered = NULL;
149         phy_led_trigger_change_speed(phy);
150
151         return 0;
152 out_unreg:
153         while (i--)
154                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
155         devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
156 out_unreg_link:
157         phy_led_trigger_unregister(phy->led_link_trigger);
158 out_free_link:
159         devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
160         phy->led_link_trigger = NULL;
161 out_clear:
162         phy->phy_num_led_triggers = 0;
163         return err;
164 }
165 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
166
167 void phy_led_triggers_unregister(struct phy_device *phy)
168 {
169         int i;
170
171         for (i = 0; i < phy->phy_num_led_triggers; i++)
172                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
173
174         if (phy->led_link_trigger)
175                 phy_led_trigger_unregister(phy->led_link_trigger);
176 }
177 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);