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ee1858d3 LK |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/init.h> | |
4 | #include <linux/proc_fs.h> | |
399dc43b | 5 | #include <linux/seq_file.h> |
ee1858d3 | 6 | #include <linux/string.h> |
b80a7186 DM |
7 | #include <linux/jiffies.h> |
8 | #include <linux/timer.h> | |
9 | #include <linux/uaccess.h> | |
ee1858d3 LK |
10 | |
11 | #include <asm/auxio.h> | |
12 | ||
13 | #define LED_MAX_LENGTH 8 /* maximum chars written to proc file */ | |
14 | ||
15 | static inline void led_toggle(void) | |
16 | { | |
17 | unsigned char val = get_auxio(); | |
18 | unsigned char on, off; | |
19 | ||
20 | if (val & AUXIO_LED) { | |
21 | on = 0; | |
22 | off = AUXIO_LED; | |
23 | } else { | |
24 | on = AUXIO_LED; | |
25 | off = 0; | |
26 | } | |
27 | ||
28 | set_auxio(on, off); | |
29 | } | |
30 | ||
31 | static struct timer_list led_blink_timer; | |
32 | ||
33 | static void led_blink(unsigned long timeout) | |
34 | { | |
35 | led_toggle(); | |
36 | ||
37 | /* reschedule */ | |
38 | if (!timeout) { /* blink according to load */ | |
39 | led_blink_timer.expires = jiffies + | |
40 | ((1 + (avenrun[0] >> FSHIFT)) * HZ); | |
41 | led_blink_timer.data = 0; | |
42 | } else { /* blink at user specified interval */ | |
43 | led_blink_timer.expires = jiffies + (timeout * HZ); | |
44 | led_blink_timer.data = timeout; | |
45 | } | |
46 | add_timer(&led_blink_timer); | |
47 | } | |
48 | ||
399dc43b | 49 | static int led_proc_show(struct seq_file *m, void *v) |
ee1858d3 | 50 | { |
ee1858d3 | 51 | if (get_auxio() & AUXIO_LED) |
399dc43b | 52 | seq_puts(m, "on\n"); |
ee1858d3 | 53 | else |
399dc43b AD |
54 | seq_puts(m, "off\n"); |
55 | return 0; | |
56 | } | |
ee1858d3 | 57 | |
399dc43b AD |
58 | static int led_proc_open(struct inode *inode, struct file *file) |
59 | { | |
60 | return single_open(file, led_proc_show, NULL); | |
ee1858d3 LK |
61 | } |
62 | ||
399dc43b AD |
63 | static ssize_t led_proc_write(struct file *file, const char __user *buffer, |
64 | size_t count, loff_t *ppos) | |
ee1858d3 LK |
65 | { |
66 | char *buf = NULL; | |
67 | ||
68 | if (count > LED_MAX_LENGTH) | |
69 | count = LED_MAX_LENGTH; | |
70 | ||
71 | buf = kmalloc(sizeof(char) * (count + 1), GFP_KERNEL); | |
72 | if (!buf) | |
73 | return -ENOMEM; | |
74 | ||
75 | if (copy_from_user(buf, buffer, count)) { | |
76 | kfree(buf); | |
77 | return -EFAULT; | |
78 | } | |
79 | ||
80 | buf[count] = '\0'; | |
81 | ||
82 | /* work around \n when echo'ing into proc */ | |
83 | if (buf[count - 1] == '\n') | |
84 | buf[count - 1] = '\0'; | |
85 | ||
86 | /* before we change anything we want to stop any running timers, | |
87 | * otherwise calls such as on will have no persistent effect | |
88 | */ | |
89 | del_timer_sync(&led_blink_timer); | |
90 | ||
91 | if (!strcmp(buf, "on")) { | |
92 | auxio_set_led(AUXIO_LED_ON); | |
93 | } else if (!strcmp(buf, "toggle")) { | |
94 | led_toggle(); | |
95 | } else if ((*buf > '0') && (*buf <= '9')) { | |
96 | led_blink(simple_strtoul(buf, NULL, 10)); | |
97 | } else if (!strcmp(buf, "load")) { | |
98 | led_blink(0); | |
99 | } else { | |
100 | auxio_set_led(AUXIO_LED_OFF); | |
101 | } | |
102 | ||
103 | kfree(buf); | |
104 | ||
105 | return count; | |
106 | } | |
107 | ||
399dc43b AD |
108 | static const struct file_operations led_proc_fops = { |
109 | .owner = THIS_MODULE, | |
110 | .open = led_proc_open, | |
111 | .read = seq_read, | |
112 | .llseek = seq_lseek, | |
113 | .release = single_release, | |
114 | .write = led_proc_write, | |
115 | }; | |
116 | ||
ee1858d3 LK |
117 | static struct proc_dir_entry *led; |
118 | ||
119 | #define LED_VERSION "0.1" | |
120 | ||
121 | static int __init led_init(void) | |
122 | { | |
123 | init_timer(&led_blink_timer); | |
124 | led_blink_timer.function = led_blink; | |
125 | ||
399dc43b | 126 | led = proc_create("led", 0, NULL, &led_proc_fops); |
ee1858d3 LK |
127 | if (!led) |
128 | return -ENOMEM; | |
ee1858d3 LK |
129 | led->owner = THIS_MODULE; |
130 | ||
131 | printk(KERN_INFO | |
132 | "led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n", | |
133 | LED_VERSION); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static void __exit led_exit(void) | |
139 | { | |
140 | remove_proc_entry("led", NULL); | |
141 | del_timer_sync(&led_blink_timer); | |
142 | } | |
143 | ||
144 | module_init(led_init); | |
145 | module_exit(led_exit); | |
146 | ||
147 | MODULE_AUTHOR("Lars Kotthoff <metalhead@metalhead.ws>"); | |
148 | MODULE_DESCRIPTION("Provides control of the front LED on SPARC systems."); | |
149 | MODULE_LICENSE("GPL"); | |
150 | MODULE_VERSION(LED_VERSION); |