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1 office 1 /*
2 * LED ADM5120 Switch Port State Trigger
3 *
4 * Copyright (C) 2007 Bernhard Held <bernhard at bernhardheld.de>
5 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
6 *
7 * This file was based on: drivers/leds/ledtrig-timer.c
8 * Copyright 2005-2006 Openedhand Ltd.
9 * Author: Richard Purdie
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 */
16  
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21  
22 #include <linux/gpio.h>
23  
24 #include "leds.h"
25  
26 #define DRV_NAME "port_state"
27 #define DRV_DESC "LED ADM5120 Switch Port State Trigger"
28  
29 struct port_state {
30 char *name;
31 unsigned int value;
32 };
33  
34 #define PORT_STATE(n, v) {.name = (n), .value = (v)}
35  
36 static struct port_state port_states[] = {
37 PORT_STATE("off", LED_OFF),
38 PORT_STATE("on", LED_FULL),
39 PORT_STATE("flash", ADM5120_GPIO_FLASH),
40 PORT_STATE("link", ADM5120_GPIO_LINK),
41 PORT_STATE("speed", ADM5120_GPIO_SPEED),
42 PORT_STATE("duplex", ADM5120_GPIO_DUPLEX),
43 PORT_STATE("act", ADM5120_GPIO_ACT),
44 PORT_STATE("coll", ADM5120_GPIO_COLL),
45 PORT_STATE("link_act", ADM5120_GPIO_LINK_ACT),
46 PORT_STATE("duplex_coll", ADM5120_GPIO_DUPLEX_COLL),
47 PORT_STATE("10M_act", ADM5120_GPIO_10M_ACT),
48 PORT_STATE("100M_act", ADM5120_GPIO_100M_ACT),
49 };
50  
51 static ssize_t led_port_state_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
53 {
54 struct led_classdev *led_cdev = dev_get_drvdata(dev);
55 struct port_state *state = led_cdev->trigger_data;
56 int len = 0;
57 int i;
58  
59 *buf = '\0';
60 for (i = 0; i < ARRAY_SIZE(port_states); i++) {
61 if (&port_states[i] == state)
62 len += sprintf(buf+len, "[%s] ", port_states[i].name);
63 else
64 len += sprintf(buf+len, "%s ", port_states[i].name);
65 }
66 len += sprintf(buf+len, "\n");
67  
68 return len;
69 }
70  
71 static ssize_t led_port_state_store(struct device *dev,
72 struct device_attribute *attr, const char *buf, size_t size)
73 {
74 struct led_classdev *led_cdev = dev_get_drvdata(dev);
75 size_t len;
76 int i;
77  
78 for (i = 0; i < ARRAY_SIZE(port_states); i++) {
79 len = strlen(port_states[i].name);
80 if (strncmp(port_states[i].name, buf, len) != 0)
81 continue;
82  
83 if (buf[len] != '\0' && buf[len] != '\n')
84 continue;
85  
86 led_cdev->trigger_data = &port_states[i];
87 led_set_brightness(led_cdev, port_states[i].value);
88 return size;
89 }
90  
91 return -EINVAL;
92 }
93  
94 static DEVICE_ATTR(port_state, 0644, led_port_state_show,
95 led_port_state_store);
96  
97 static void adm5120_switch_trig_activate(struct led_classdev *led_cdev)
98 {
99 struct port_state *state = port_states;
100 int rc;
101  
102 led_cdev->trigger_data = state;
103  
104 rc = device_create_file(led_cdev->dev, &dev_attr_port_state);
105 if (rc)
106 goto err;
107  
108 led_set_brightness(led_cdev, state->value);
109  
110 return;
111 err:
112 led_cdev->trigger_data = NULL;
113 }
114  
115 static void adm5120_switch_trig_deactivate(struct led_classdev *led_cdev)
116 {
117 struct port_state *state = led_cdev->trigger_data;
118  
119 if (!state)
120 return;
121  
122 device_remove_file(led_cdev->dev, &dev_attr_port_state);
123  
124 }
125  
126 static struct led_trigger adm5120_switch_led_trigger = {
127 .name = DRV_NAME,
128 .activate = adm5120_switch_trig_activate,
129 .deactivate = adm5120_switch_trig_deactivate,
130 };
131  
132 static int __init adm5120_switch_trig_init(void)
133 {
134 led_trigger_register(&adm5120_switch_led_trigger);
135 return 0;
136 }
137  
138 static void __exit adm5120_switch_trig_exit(void)
139 {
140 led_trigger_unregister(&adm5120_switch_led_trigger);
141 }
142  
143 module_init(adm5120_switch_trig_init);
144 module_exit(adm5120_switch_trig_exit);
145  
146 MODULE_AUTHOR("Bernhard Held <bernhard at bernhardheld.de>, "
147 "Gabor Juhos <juhosg@openwrt.org>");
148 MODULE_DESCRIPTION(DRV_DESC);
149 MODULE_LICENSE("GPL v2");