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