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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> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
ee1858d3 | 7 | #include <linux/string.h> |
b80a7186 DM |
8 | #include <linux/jiffies.h> |
9 | #include <linux/timer.h> | |
10 | #include <linux/uaccess.h> | |
ee1858d3 LK |
11 | |
12 | #include <asm/auxio.h> | |
13 | ||
14 | #define LED_MAX_LENGTH 8 /* maximum chars written to proc file */ | |
15 | ||
16 | static inline void led_toggle(void) | |
17 | { | |
18 | unsigned char val = get_auxio(); | |
19 | unsigned char on, off; | |
20 | ||
21 | if (val & AUXIO_LED) { | |
22 | on = 0; | |
23 | off = AUXIO_LED; | |
24 | } else { | |
25 | on = AUXIO_LED; | |
26 | off = 0; | |
27 | } | |
28 | ||
29 | set_auxio(on, off); | |
30 | } | |
31 | ||
32 | static struct timer_list led_blink_timer; | |
33 | ||
34 | static void led_blink(unsigned long timeout) | |
35 | { | |
36 | led_toggle(); | |
37 | ||
38 | /* reschedule */ | |
39 | if (!timeout) { /* blink according to load */ | |
40 | led_blink_timer.expires = jiffies + | |
41 | ((1 + (avenrun[0] >> FSHIFT)) * HZ); | |
42 | led_blink_timer.data = 0; | |
43 | } else { /* blink at user specified interval */ | |
44 | led_blink_timer.expires = jiffies + (timeout * HZ); | |
45 | led_blink_timer.data = timeout; | |
46 | } | |
47 | add_timer(&led_blink_timer); | |
48 | } | |
49 | ||
399dc43b | 50 | static int led_proc_show(struct seq_file *m, void *v) |
ee1858d3 | 51 | { |
ee1858d3 | 52 | if (get_auxio() & AUXIO_LED) |
399dc43b | 53 | seq_puts(m, "on\n"); |
ee1858d3 | 54 | else |
399dc43b AD |
55 | seq_puts(m, "off\n"); |
56 | return 0; | |
57 | } | |
ee1858d3 | 58 | |
399dc43b AD |
59 | static int led_proc_open(struct inode *inode, struct file *file) |
60 | { | |
61 | return single_open(file, led_proc_show, NULL); | |
ee1858d3 LK |
62 | } |
63 | ||
399dc43b AD |
64 | static ssize_t led_proc_write(struct file *file, const char __user *buffer, |
65 | size_t count, loff_t *ppos) | |
ee1858d3 LK |
66 | { |
67 | char *buf = NULL; | |
68 | ||
69 | if (count > LED_MAX_LENGTH) | |
70 | count = LED_MAX_LENGTH; | |
71 | ||
72 | buf = kmalloc(sizeof(char) * (count + 1), GFP_KERNEL); | |
73 | if (!buf) | |
74 | return -ENOMEM; | |
75 | ||
76 | if (copy_from_user(buf, buffer, count)) { | |
77 | kfree(buf); | |
78 | return -EFAULT; | |
79 | } | |
80 | ||
81 | buf[count] = '\0'; | |
82 | ||
83 | /* work around \n when echo'ing into proc */ | |
84 | if (buf[count - 1] == '\n') | |
85 | buf[count - 1] = '\0'; | |
86 | ||
87 | /* before we change anything we want to stop any running timers, | |
88 | * otherwise calls such as on will have no persistent effect | |
89 | */ | |
90 | del_timer_sync(&led_blink_timer); | |
91 | ||
92 | if (!strcmp(buf, "on")) { | |
93 | auxio_set_led(AUXIO_LED_ON); | |
94 | } else if (!strcmp(buf, "toggle")) { | |
95 | led_toggle(); | |
96 | } else if ((*buf > '0') && (*buf <= '9')) { | |
97 | led_blink(simple_strtoul(buf, NULL, 10)); | |
98 | } else if (!strcmp(buf, "load")) { | |
99 | led_blink(0); | |
100 | } else { | |
101 | auxio_set_led(AUXIO_LED_OFF); | |
102 | } | |
103 | ||
104 | kfree(buf); | |
105 | ||
106 | return count; | |
107 | } | |
108 | ||
399dc43b AD |
109 | static const struct file_operations led_proc_fops = { |
110 | .owner = THIS_MODULE, | |
111 | .open = led_proc_open, | |
112 | .read = seq_read, | |
113 | .llseek = seq_lseek, | |
114 | .release = single_release, | |
115 | .write = led_proc_write, | |
116 | }; | |
117 | ||
ee1858d3 LK |
118 | static struct proc_dir_entry *led; |
119 | ||
120 | #define LED_VERSION "0.1" | |
121 | ||
122 | static int __init led_init(void) | |
123 | { | |
124 | init_timer(&led_blink_timer); | |
125 | led_blink_timer.function = led_blink; | |
126 | ||
399dc43b | 127 | led = proc_create("led", 0, NULL, &led_proc_fops); |
ee1858d3 LK |
128 | if (!led) |
129 | return -ENOMEM; | |
ee1858d3 LK |
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); |