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); 153