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                 else
  52                         led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
  53
  54                 led_trigger_event(&plt->trigger, LED_FULL);
  55                 phy->last_triggered = plt;
  56         }
  57 }
  58 EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
  59
  60 static void phy_led_trigger_format_name(struct phy_device *phy, char *buf,
  61                                         size_t size, const char *suffix)
  62 {
  63         snprintf(buf, size, PHY_ID_FMT ":%s",
  64                  phy->mdio.bus->id, phy->mdio.addr, suffix);
  65 }
  66
  67 static int phy_led_trigger_register(struct phy_device *phy,
  68                                     struct phy_led_trigger *plt,
  69                                     unsigned int speed,
  70                                     const char *suffix)
  71 {
  72         plt->speed = speed;
  73         phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name), suffix);
  74         plt->trigger.name = plt->name;
  75
  76         return led_trigger_register(&plt->trigger);
  77 }
  78
  79 static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
  80 {
  81         led_trigger_unregister(&plt->trigger);
  82 }
  83
  84 int phy_led_triggers_register(struct phy_device *phy)
  85 {
  86         int i, err;
  87         unsigned int speeds[50];
  88
  89         phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
  90                                                          ARRAY_SIZE(speeds));
  91         if (!phy->phy_num_led_triggers)
  92                 return 0;
  93
  94         phy->led_link_trigger = devm_kzalloc(&phy->mdio.dev,
  95                                              sizeof(*phy->led_link_trigger),
  96                                              GFP_KERNEL);
  97         if (!phy->led_link_trigger) {
  98                 err = -ENOMEM;
  99                 goto out_clear;
 100         }
 101
 102         err = phy_led_trigger_register(phy, phy->led_link_trigger, 0, "link");
 103         if (err)
 104                 goto out_free_link;
 105
 106         phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev,
 107                                             phy->phy_num_led_triggers,
 108                                             sizeof(struct phy_led_trigger),
 109                                             GFP_KERNEL);
 110         if (!phy->phy_led_triggers) {
 111                 err = -ENOMEM;
 112                 goto out_unreg_link;
 113         }
 114
 115         for (i = 0; i < phy->phy_num_led_triggers; i++) {
 116                 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
 117                                                speeds[i],
 118                                                phy_speed_to_str(speeds[i]));
 119                 if (err)
 120                         goto out_unreg;
 121         }
 122
 123         phy->last_triggered = NULL;
 124         phy_led_trigger_change_speed(phy);
 125
 126         return 0;
 127 out_unreg:
 128         while (i--)
 129                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
 130         devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
 131 out_unreg_link:
 132         phy_led_trigger_unregister(phy->led_link_trigger);
 133 out_free_link:
 134         devm_kfree(&phy->mdio.dev, phy->led_link_trigger);
 135         phy->led_link_trigger = NULL;
 136 out_clear:
 137         phy->phy_num_led_triggers = 0;
 138         return err;
 139 }
 140 EXPORT_SYMBOL_GPL(phy_led_triggers_register);
 141
 142 void phy_led_triggers_unregister(struct phy_device *phy)
 143 {
 144         int i;
 145
 146         for (i = 0; i < phy->phy_num_led_triggers; i++)
 147                 phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
 148
 149         if (phy->led_link_trigger)
 150                 phy_led_trigger_unregister(phy->led_link_trigger);
 151 }
 152 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);