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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> |
3 | #include <linux/init.h> |
4 | #include <linux/proc_fs.h> |
5 | #include <linux/seq_file.h> |
6 | #include <linux/slab.h> |
7 | #include <linux/string.h> |
8 | #include <linux/jiffies.h> |
9 | #include <linux/timer.h> |
10 | #include <linux/uaccess.h> |
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 | |
50 | static int led_proc_show(struct seq_file *m, void *v) |
51 | { |
52 | if (get_auxio() & AUXIO_LED) |
53 | seq_puts(m, "on\n"); |
54 | else |
55 | seq_puts(m, "off\n"); |
56 | return 0; |
57 | } |
58 | |
59 | static int led_proc_open(struct inode *inode, struct file *file) |
60 | { |
61 | return single_open(file, led_proc_show, NULL); |
62 | } |
63 | |
64 | static ssize_t led_proc_write(struct file *file, const char __user *buffer, |
65 | size_t count, loff_t *ppos) |
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 | |
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 | |
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 | |
127 | led = proc_create("led", 0, NULL, &led_proc_fops); |
128 | if (!led) |
129 | return -ENOMEM; |
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); |
151 |
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