projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 996a953d FB |
1 | /* |
| 2 | * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com> | |
| a1ef7bd9 | 3 | * Copyright 2012, Kurt Van Dijck <kurt.van.dijck@eia.be> |
| 996a953d FB |
4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License version 2 as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/module.h> | |
| 11 | #include <linux/device.h> | |
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/slab.h> | |
| 14 | #include <linux/netdevice.h> | |
| 15 | #include <linux/can/dev.h> | |
| 16 | ||
| 17 | #include <linux/can/led.h> | |
| 18 | ||
| 19 | static unsigned long led_delay = 50; | |
| 20 | module_param(led_delay, ulong, 0644); | |
| 21 | MODULE_PARM_DESC(led_delay, | |
| 22 | "blink delay time for activity leds (msecs, default: 50)."); | |
| 23 | ||
| 24 | /* Trigger a LED event in response to a CAN device event */ | |
| 25 | void can_led_event(struct net_device *netdev, enum can_led_event event) | |
| 26 | { | |
| 27 | struct can_priv *priv = netdev_priv(netdev); | |
| 28 | ||
| 29 | switch (event) { | |
| 30 | case CAN_LED_EVENT_OPEN: | |
| 31 | led_trigger_event(priv->tx_led_trig, LED_FULL); | |
| 32 | led_trigger_event(priv->rx_led_trig, LED_FULL); | |
| 33 | break; | |
| 34 | case CAN_LED_EVENT_STOP: | |
| 35 | led_trigger_event(priv->tx_led_trig, LED_OFF); | |
| 36 | led_trigger_event(priv->rx_led_trig, LED_OFF); | |
| 37 | break; | |
| 38 | case CAN_LED_EVENT_TX: | |
| 39 | if (led_delay) | |
| 40 | led_trigger_blink_oneshot(priv->tx_led_trig, | |
| 41 | &led_delay, &led_delay, 1); | |
| 42 | break; | |
| 43 | case CAN_LED_EVENT_RX: | |
| 44 | if (led_delay) | |
| 45 | led_trigger_blink_oneshot(priv->rx_led_trig, | |
| 46 | &led_delay, &led_delay, 1); | |
| 47 | break; | |
| 48 | } | |
| 49 | } | |
| 50 | EXPORT_SYMBOL_GPL(can_led_event); | |
| 51 | ||
| 52 | static void can_led_release(struct device *gendev, void *res) | |
| 53 | { | |
| 54 | struct can_priv *priv = netdev_priv(to_net_dev(gendev)); | |
| 55 | ||
| 56 | led_trigger_unregister_simple(priv->tx_led_trig); | |
| 57 | led_trigger_unregister_simple(priv->rx_led_trig); | |
| 58 | } | |
| 59 | ||
| 60 | /* Register CAN LED triggers for a CAN device | |
| 61 | * | |
| 62 | * This is normally called from a driver's probe function | |
| 63 | */ | |
| 64 | void devm_can_led_init(struct net_device *netdev) | |
| 65 | { | |
| 66 | struct can_priv *priv = netdev_priv(netdev); | |
| 67 | void *res; | |
| 68 | ||
| 69 | res = devres_alloc(can_led_release, 0, GFP_KERNEL); | |
| 70 | if (!res) { | |
| 71 | netdev_err(netdev, "cannot register LED triggers\n"); | |
| 72 | return; | |
| 73 | } | |
| 74 | ||
| 75 | snprintf(priv->tx_led_trig_name, sizeof(priv->tx_led_trig_name), | |
| 76 | "%s-tx", netdev->name); | |
| 77 | snprintf(priv->rx_led_trig_name, sizeof(priv->rx_led_trig_name), | |
| 78 | "%s-rx", netdev->name); | |
| 79 | ||
| 80 | led_trigger_register_simple(priv->tx_led_trig_name, | |
| 81 | &priv->tx_led_trig); | |
| 82 | led_trigger_register_simple(priv->rx_led_trig_name, | |
| 83 | &priv->rx_led_trig); | |
| 84 | ||
| 85 | devres_add(&netdev->dev, res); | |
| 86 | } | |
| 87 | EXPORT_SYMBOL_GPL(devm_can_led_init); | |
| a1ef7bd9 KVD |
88 | |
| 89 | /* NETDEV rename notifier to rename the associated led triggers too */ | |
| 90 | static int can_led_notifier(struct notifier_block *nb, unsigned long msg, | |
| 351638e7 | 91 | void *ptr) |
| a1ef7bd9 | 92 | { |
| 351638e7 | 93 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); |
| a1ef7bd9 KVD |
94 | struct can_priv *priv = safe_candev_priv(netdev); |
| 95 | char name[CAN_LED_NAME_SZ]; | |
| 96 | ||
| 97 | if (!priv) | |
| 98 | return NOTIFY_DONE; | |
| 99 | ||
| 100 | if (msg == NETDEV_CHANGENAME) { | |
| 101 | snprintf(name, sizeof(name), "%s-tx", netdev->name); | |
| 102 | led_trigger_rename_static(name, priv->tx_led_trig); | |
| 103 | ||
| 104 | snprintf(name, sizeof(name), "%s-rx", netdev->name); | |
| 105 | led_trigger_rename_static(name, priv->rx_led_trig); | |
| 106 | } | |
| 107 | ||
| 108 | return NOTIFY_DONE; | |
| 109 | } | |
| 110 | ||
| 111 | /* notifier block for netdevice event */ | |
| 112 | static struct notifier_block can_netdev_notifier __read_mostly = { | |
| 113 | .notifier_call = can_led_notifier, | |
| 114 | }; | |
| 115 | ||
| 116 | int __init can_led_notifier_init(void) | |
| 117 | { | |
| 118 | return register_netdevice_notifier(&can_netdev_notifier); | |
| 119 | } | |
| 120 | ||
| 121 | void __exit can_led_notifier_exit(void) | |
| 122 | { | |
| 123 | unregister_netdevice_notifier(&can_netdev_notifier); | |
| 124 | } |