1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
4 * Copyright 2012, Kurt Van Dijck <kurt.van.dijck@eia.be>
5 */
6
7 #include <linux/module.h>
8 #include <linux/device.h>
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/netdevice.h>
12 #include <linux/can/dev.h>
13
14 #include <linux/can/led.h>
15
16 static unsigned long led_delay = 50;
17 module_param(led_delay, ulong, 0644);
18 MODULE_PARM_DESC(led_delay,
19 "blink delay time for activity leds (msecs, default: 50).");
20
21 /* Trigger a LED event in response to a CAN device event */
can_led_event(struct net_device * netdev,enum can_led_event event)22 void can_led_event(struct net_device *netdev, enum can_led_event event)
23 {
24 struct can_priv *priv = netdev_priv(netdev);
25
26 switch (event) {
27 case CAN_LED_EVENT_OPEN:
28 led_trigger_event(priv->tx_led_trig, LED_FULL);
29 led_trigger_event(priv->rx_led_trig, LED_FULL);
30 led_trigger_event(priv->rxtx_led_trig, LED_FULL);
31 break;
32 case CAN_LED_EVENT_STOP:
33 led_trigger_event(priv->tx_led_trig, LED_OFF);
34 led_trigger_event(priv->rx_led_trig, LED_OFF);
35 led_trigger_event(priv->rxtx_led_trig, LED_OFF);
36 break;
37 case CAN_LED_EVENT_TX:
38 if (led_delay) {
39 led_trigger_blink_oneshot(priv->tx_led_trig,
40 &led_delay, &led_delay, 1);
41 led_trigger_blink_oneshot(priv->rxtx_led_trig,
42 &led_delay, &led_delay, 1);
43 }
44 break;
45 case CAN_LED_EVENT_RX:
46 if (led_delay) {
47 led_trigger_blink_oneshot(priv->rx_led_trig,
48 &led_delay, &led_delay, 1);
49 led_trigger_blink_oneshot(priv->rxtx_led_trig,
50 &led_delay, &led_delay, 1);
51 }
52 break;
53 }
54 }
55 EXPORT_SYMBOL_GPL(can_led_event);
56
can_led_release(struct device * gendev,void * res)57 static void can_led_release(struct device *gendev, void *res)
58 {
59 struct can_priv *priv = netdev_priv(to_net_dev(gendev));
60
61 led_trigger_unregister_simple(priv->tx_led_trig);
62 led_trigger_unregister_simple(priv->rx_led_trig);
63 led_trigger_unregister_simple(priv->rxtx_led_trig);
64 }
65
66 /* Register CAN LED triggers for a CAN device
67 *
68 * This is normally called from a driver's probe function
69 */
devm_can_led_init(struct net_device * netdev)70 void devm_can_led_init(struct net_device *netdev)
71 {
72 struct can_priv *priv = netdev_priv(netdev);
73 void *res;
74
75 res = devres_alloc(can_led_release, 0, GFP_KERNEL);
76 if (!res) {
77 netdev_err(netdev, "cannot register LED triggers\n");
78 return;
79 }
80
81 snprintf(priv->tx_led_trig_name, sizeof(priv->tx_led_trig_name),
82 "%s-tx", netdev->name);
83 snprintf(priv->rx_led_trig_name, sizeof(priv->rx_led_trig_name),
84 "%s-rx", netdev->name);
85 snprintf(priv->rxtx_led_trig_name, sizeof(priv->rxtx_led_trig_name),
86 "%s-rxtx", netdev->name);
87
88 led_trigger_register_simple(priv->tx_led_trig_name,
89 &priv->tx_led_trig);
90 led_trigger_register_simple(priv->rx_led_trig_name,
91 &priv->rx_led_trig);
92 led_trigger_register_simple(priv->rxtx_led_trig_name,
93 &priv->rxtx_led_trig);
94
95 devres_add(&netdev->dev, res);
96 }
97 EXPORT_SYMBOL_GPL(devm_can_led_init);
98
99 /* NETDEV rename notifier to rename the associated led triggers too */
can_led_notifier(struct notifier_block * nb,unsigned long msg,void * ptr)100 static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
101 void *ptr)
102 {
103 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
104 struct can_priv *priv = safe_candev_priv(netdev);
105 char name[CAN_LED_NAME_SZ];
106
107 if (!priv)
108 return NOTIFY_DONE;
109
110 if (!priv->tx_led_trig || !priv->rx_led_trig || !priv->rxtx_led_trig)
111 return NOTIFY_DONE;
112
113 if (msg == NETDEV_CHANGENAME) {
114 snprintf(name, sizeof(name), "%s-tx", netdev->name);
115 led_trigger_rename_static(name, priv->tx_led_trig);
116
117 snprintf(name, sizeof(name), "%s-rx", netdev->name);
118 led_trigger_rename_static(name, priv->rx_led_trig);
119
120 snprintf(name, sizeof(name), "%s-rxtx", netdev->name);
121 led_trigger_rename_static(name, priv->rxtx_led_trig);
122 }
123
124 return NOTIFY_DONE;
125 }
126
127 /* notifier block for netdevice event */
128 static struct notifier_block can_netdev_notifier __read_mostly = {
129 .notifier_call = can_led_notifier,
130 };
131
can_led_notifier_init(void)132 int __init can_led_notifier_init(void)
133 {
134 return register_netdevice_notifier(&can_netdev_notifier);
135 }
136
can_led_notifier_exit(void)137 void __exit can_led_notifier_exit(void)
138 {
139 unregister_netdevice_notifier(&can_netdev_notifier);
140 }
141