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1/*
2 * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
3 * Copyright 2012, Kurt Van Dijck <kurt.van.dijck@eia.be>
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
19static unsigned long led_delay = 50;
20module_param(led_delay, ulong, 0644);
21MODULE_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 */
25void 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}
50EXPORT_SYMBOL_GPL(can_led_event);
51
52static 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 */
64void 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}
87EXPORT_SYMBOL_GPL(devm_can_led_init);
88
89/* NETDEV rename notifier to rename the associated led triggers too */
90static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
91 void *ptr)
92{
93 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
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 (!priv->tx_led_trig || !priv->rx_led_trig)
101 return NOTIFY_DONE;
102
103 if (msg == NETDEV_CHANGENAME) {
104 snprintf(name, sizeof(name), "%s-tx", netdev->name);
105 led_trigger_rename_static(name, priv->tx_led_trig);
106
107 snprintf(name, sizeof(name), "%s-rx", netdev->name);
108 led_trigger_rename_static(name, priv->rx_led_trig);
109 }
110
111 return NOTIFY_DONE;
112}
113
114/* notifier block for netdevice event */
115static struct notifier_block can_netdev_notifier __read_mostly = {
116 .notifier_call = can_led_notifier,
117};
118
119int __init can_led_notifier_init(void)
120{
121 return register_netdevice_notifier(&can_netdev_notifier);
122}
123
124void __exit can_led_notifier_exit(void)
125{
126 unregister_netdevice_notifier(&can_netdev_notifier);
127}
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
16static unsigned long led_delay = 50;
17module_param(led_delay, ulong, 0644);
18MODULE_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 */
22void 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}
55EXPORT_SYMBOL_GPL(can_led_event);
56
57static 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 */
70void 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}
97EXPORT_SYMBOL_GPL(devm_can_led_init);
98
99/* NETDEV rename notifier to rename the associated led triggers too */
100static 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 */
128static struct notifier_block can_netdev_notifier __read_mostly = {
129 .notifier_call = can_led_notifier,
130};
131
132int __init can_led_notifier_init(void)
133{
134 return register_netdevice_notifier(&can_netdev_notifier);
135}
136
137void __exit can_led_notifier_exit(void)
138{
139 unregister_netdevice_notifier(&can_netdev_notifier);
140}