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); 156