drivers/net/phy/phy_led_triggers.c

   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 static struct phy_led_trigger *phy_speed_to_led_trigger(struct phy_device *phy,
   9                                                         unsigned int speed)
  10 {
  11         unsigned int i;
  12
  13         for (i = 0; i < phy->phy_num_led_triggers; i++) {
  14                 if (phy->phy_led_triggers[i].speed == speed)
  15                         return &phy->phy_led_triggers[i];
  16         }
  17         return NULL;
  18 }
  19
  20 static void phy_led_trigger_no_link(struct phy_device *phy)
  21 {
  22         if (phy->last_triggered) {
  23                 led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
  24                 led_trigger_event(&phy->led_link_trigger->trigger, LED_OFF);
  25                 phy->last_triggered = NULL;
  26         }
  27 }
  28
  29 void phy_led_trigger_change_speed(struct phy_device *phy)
  30 {
  31         struct phy_led_trigger *plt;
  32
  33         if (!phy->link)
  34                 return phy_led_trigger_no_link(phy);
  35
  36         if (phy->speed == 0)
  37                 return;
  38
  39         plt = phy_speed_to_led_trigger(phy, phy->speed);
  40         if (!plt) {
  41                 netdev_alert(phy->attached_dev,
  42                              "No phy led trigger registered for speed(%d)\n",
  43                              phy->speed);
  44                 return phy_led_trigger_no_link(phy);
  45         }
  46
  47         if (plt != phy->last_triggered) {
  48                 if (!phy->last_triggered)
  49                         led_trigger_event(&phy->led_link_trigger->trigger,
  50                                           LED_FULL);
  51
  52                 led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
  53                 led_trigger_event(&plt->trigger, LED_FULL);
  54                 phy->last_triggered = plt;
  55         }
  56 }
  57 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
  58
  59 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
  60                                         size_t size, const char *suffix)
  61 {
  62         snprintf(buf, size, PHY_ID_FMT ":%s",
  63                  phy->mdio.bus->id, phy->mdio.addr, suffix);
  64 }
  65
  66 static int phy_led_trigger_register(struct phy_device *phy,
  67                                     struct phy_led_trigger *plt,
  68                                     unsigned int speed)
  69 {
  70         plt->speed = speed;
  71         phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name),
  72                                     phy_speed_to_str(speed));
  73         plt->trigger.name = plt->name;
  74
  75         return led_trigger_register(&plt->trigger);
  76 }
  77
  78 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
  79 {
  80         led_trigger_unregister(&plt->trigger);
  81 }
  82
  83 int phy_led_triggers_register(struct phy_device *phy)
  84 {
  85         int i, err;
  86         unsigned int speeds[50];
  87
  88         phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
  89                                                          ARRAY_SIZE(speeds));
  90         if (!phy->phy_num_led_triggers)
  91                 return 0;
  92
  93         phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
  94                                              sizeof(*phy->led_link_trigger),
  95                                              GFP_KERNEL);
  96         if (!phy->led_link_trigger) {
  97                 err = -ENOMEM;
  98                 goto out_clear;
  99         }
 100
 101         phy_led_trigger_format_name(phy, phy->led_link_trigger->name,
 102                                     sizeof(phy->led_link_trigger->name),
 103                                     "link");
 104         phy->led_link_trigger->trigger.name = phy->led_link_trigger->name;
 105
 106         err = led_trigger_register(&phy->led_link_trigger->trigger);
 107         if (err)
 108                 goto out_free_link;
 109
 110         phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
 111                                             phy->phy_num_led_triggers,
 112                                             sizeof(struct phy_led_trigger),
 113                                             GFP_KERNEL);
 114         if (!phy->phy_led_triggers) {
 115                 err = -ENOMEM;
 116                 goto out_unreg_link;
 117         }
 118
 119         for (i = 0; i < phy->phy_num_led_triggers; i++) {
 120                 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
 121                                                speeds[i]);
 122                 if (err)
 123                         goto out_unreg;
 124         }
 125
 126         phy->last_triggered = NULL;
 127         phy_led_trigger_change_speed(phy);
 128
 129         return 0;
 130 out_unreg:
 131         while (i--)
 132                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
 133         devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
 134 out_unreg_link:
 135         phy_led_trigger_unregister(phy->led_link_trigger);
 136 out_free_link:
 137         devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
 138         phy->led_link_trigger = NULL;
 139 out_clear:
 140         phy->phy_num_led_triggers = 0;
 141         return err;
 142 }
 143 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
 144
 145 void phy_led_triggers_unregister(struct phy_device *phy)
 146 {
 147         int i;
 148
 149         for (i = 0; i < phy->phy_num_led_triggers; i++)
 150                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
 151
 152         if (phy->led_link_trigger)
 153                 phy_led_trigger_unregister(phy->led_link_trigger);
 154 }
 155 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);