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 { 71 plt->speed = speed; 72 phy_led_trigger_format_name(phy, plt->name, sizeof(plt->name), 73 phy_speed_to_str(speed)); 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 phy_led_trigger_format_name(phy, phy->led_link_trigger->name, 103 sizeof(phy->led_link_trigger->name), 104 "link"); 105 phy->led_link_trigger->trigger.name = phy->led_link_trigger->name; 106 107 err = led_trigger_register(&phy->led_link_trigger->trigger); 108 if (err) 109 goto out_free_link; 110 111 phy->phy_led_triggers = devm_kcalloc(&phy->mdio.dev, 112 phy->phy_num_led_triggers, 113 sizeof(struct phy_led_trigger), 114 GFP_KERNEL); 115 if (!phy->phy_led_triggers) { 116 err = -ENOMEM; 117 goto out_unreg_link; 118 } 119 120 for (i = 0; i < phy->phy_num_led_triggers; i++) { 121 err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i], 122 speeds[i]); 123 if (err) 124 goto out_unreg; 125 } 126 127 phy->last_triggered = NULL; 128 phy_led_trigger_change_speed(phy); 129 130 return 0; 131 out_unreg: 132 while (i--) 133 phy_led_trigger_unregister(&phy->phy_led_triggers[i]); 134 devm_kfree(&phy->mdio.dev, phy->phy_led_triggers); 135 out_unreg_link: 136 phy_led_trigger_unregister(phy->led_link_trigger); 137 out_free_link: 138 devm_kfree(&phy->mdio.dev, phy->led_link_trigger); 139 phy->led_link_trigger = NULL; 140 out_clear: 141 phy->phy_num_led_triggers = 0; 142 return err; 143 } 144 EXPORT_SYMBOL_GPL(phy_led_triggers_register); 145 146 void phy_led_triggers_unregister(struct phy_device *phy) 147 { 148 int i; 149 150 for (i = 0; i < phy->phy_num_led_triggers; i++) 151 phy_led_trigger_unregister(&phy->phy_led_triggers[i]); 152 153 if (phy->led_link_trigger) 154 phy_led_trigger_unregister(phy->led_link_trigger); 155 } 156 EXPORT_SYMBOL_GPL(phy_led_triggers_unregister); 157