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
  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
  69 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
  70                                         size_t size, const char *suffix)
  71 {
  72         snprintf(buf, size, PHY_ID_FMT ":%s",
  73                  phy->mdio.bus->id, phy->mdio.addr, suffix);
  74 }
  75
  76 static int phy_led_trigger_register(struct phy_device *phy,
  77                                     struct phy_led_trigger *plt,
  78                                     unsigned int speed)
  79 {
  80         plt->speed = speed;
  81         phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
  82                                     phy_speed_to_str(speed));
  83         plt->trigger.name = plt->name;
  84
  85         return led_trigger_register(&plt->trigger);
  86 }
  87
  88 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
  89 {
  90         led_trigger_unregister(&plt->trigger);
  91 }
  92
  93 int phy_led_triggers_register(struct phy_device *phy)
  94 {
  95         int i, err;
  96         unsigned int speeds[50];
  97
  98         phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
  99                                                          ARRAY_SIZE(speeds));
 100         if (!phy->phy_num_led_triggers)
 101                 return 0;
 102
 103         phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
 104                                              sizeof(*phy->led_link_trigger),
 105                                              GFP_KERNEL);
 106         if (!phy->led_link_trigger) {
 107                 err = -ENOMEM;
 108                 goto out_clear;
 109         }
 110
 111         phy_led_trigger_format_name(phy, phy->led_link_trigger->name,
 112                                     sizeof(phy->led_link_trigger->name),
 113                                     "link");
 114         phy->led_link_trigger->trigger.name = phy->led_link_trigger->name;
 115
 116         err = led_trigger_register(&phy->led_link_trigger->trigger);
 117         if (err)
 118                 goto out_free_link;
 119
 120         phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
 121                                             phy->phy_num_led_triggers,
 122                                             sizeof(struct phy_led_trigger),
 123                                             GFP_KERNEL);
 124         if (!phy->phy_led_triggers) {
 125                 err = -ENOMEM;
 126                 goto out_unreg_link;
 127         }
 128
 129         for (i = 0; i < phy->phy_num_led_triggers; i++) {
 130                 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
 131                                                speeds[i]);
 132                 if (err)
 133                         goto out_unreg;
 134         }
 135
 136         phy->last_triggered = NULL;
 137         phy_led_trigger_change_speed(phy);
 138
 139         return 0;
 140 out_unreg:
 141         while (i--)
 142                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
 143         devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
 144 out_unreg_link:
 145         phy_led_trigger_unregister(phy->led_link_trigger);
 146 out_free_link:
 147         devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
 148         phy->led_link_trigger = NULL;
 149 out_clear:
 150         phy->phy_num_led_triggers = 0;
 151         return err;
 152 }
 153 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
 154
 155 void phy_led_triggers_unregister(struct phy_device *phy)
 156 {
 157         int i;
 158
 159         for (i = 0; i < phy->phy_num_led_triggers; i++)
 160                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
 161
 162         if (phy->led_link_trigger)
 163                 phy_led_trigger_unregister(phy->led_link_trigger);
 164 }
 165 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);