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);