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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 led_trigger_event(priv->rxtx_led_trig, LED_FULL);
34 break;
35 case CAN_LED_EVENT_STOP:
36 led_trigger_event(priv->tx_led_trig, LED_OFF);
37 led_trigger_event(priv->rx_led_trig, LED_OFF);
38 led_trigger_event(priv->rxtx_led_trig, LED_OFF);
39 break;
40 case CAN_LED_EVENT_TX:
41 if (led_delay) {
42 led_trigger_blink_oneshot(priv->tx_led_trig,
43 &led_delay, &led_delay, 1);
44 led_trigger_blink_oneshot(priv->rxtx_led_trig,
45 &led_delay, &led_delay, 1);
46 }
47 break;
48 case CAN_LED_EVENT_RX:
49 if (led_delay) {
50 led_trigger_blink_oneshot(priv->rx_led_trig,
51 &led_delay, &led_delay, 1);
52 led_trigger_blink_oneshot(priv->rxtx_led_trig,
53 &led_delay, &led_delay, 1);
54 }
55 break;
56 }
57}
58EXPORT_SYMBOL_GPL(can_led_event);
59
60static void can_led_release(struct device *gendev, void *res)
61{
62 struct can_priv *priv = netdev_priv(to_net_dev(gendev));
63
64 led_trigger_unregister_simple(priv->tx_led_trig);
65 led_trigger_unregister_simple(priv->rx_led_trig);
66 led_trigger_unregister_simple(priv->rxtx_led_trig);
67}
68
69/* Register CAN LED triggers for a CAN device
70 *
71 * This is normally called from a driver's probe function
72 */
73void devm_can_led_init(struct net_device *netdev)
74{
75 struct can_priv *priv = netdev_priv(netdev);
76 void *res;
77
78 res = devres_alloc(can_led_release, 0, GFP_KERNEL);
79 if (!res) {
80 netdev_err(netdev, "cannot register LED triggers\n");
81 return;
82 }
83
84 snprintf(priv->tx_led_trig_name, sizeof(priv->tx_led_trig_name),
85 "%s-tx", netdev->name);
86 snprintf(priv->rx_led_trig_name, sizeof(priv->rx_led_trig_name),
87 "%s-rx", netdev->name);
88 snprintf(priv->rxtx_led_trig_name, sizeof(priv->rxtx_led_trig_name),
89 "%s-rxtx", netdev->name);
90
91 led_trigger_register_simple(priv->tx_led_trig_name,
92 &priv->tx_led_trig);
93 led_trigger_register_simple(priv->rx_led_trig_name,
94 &priv->rx_led_trig);
95 led_trigger_register_simple(priv->rxtx_led_trig_name,
96 &priv->rxtx_led_trig);
97
98 devres_add(&netdev->dev, res);
99}
100EXPORT_SYMBOL_GPL(devm_can_led_init);
101
102/* NETDEV rename notifier to rename the associated led triggers too */
103static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
104 void *ptr)
105{
106 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
107 struct can_priv *priv = safe_candev_priv(netdev);
108 char name[CAN_LED_NAME_SZ];
109
110 if (!priv)
111 return NOTIFY_DONE;
112
113 if (!priv->tx_led_trig || !priv->rx_led_trig || !priv->rxtx_led_trig)
114 return NOTIFY_DONE;
115
116 if (msg == NETDEV_CHANGENAME) {
117 snprintf(name, sizeof(name), "%s-tx", netdev->name);
118 led_trigger_rename_static(name, priv->tx_led_trig);
119
120 snprintf(name, sizeof(name), "%s-rx", netdev->name);
121 led_trigger_rename_static(name, priv->rx_led_trig);
122
123 snprintf(name, sizeof(name), "%s-rxtx", netdev->name);
124 led_trigger_rename_static(name, priv->rxtx_led_trig);
125 }
126
127 return NOTIFY_DONE;
128}
129
130/* notifier block for netdevice event */
131static struct notifier_block can_netdev_notifier __read_mostly = {
132 .notifier_call = can_led_notifier,
133};
134
135int __init can_led_notifier_init(void)
136{
137 return register_netdevice_notifier(&can_netdev_notifier);
138}
139
140void __exit can_led_notifier_exit(void)
141{
142 unregister_netdevice_notifier(&can_netdev_notifier);
143}
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}