Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/module.h> |
| 3 | #include <linux/init.h> |
| 4 | #include <linux/proc_fs.h> |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 5 | #include <linux/seq_file.h> |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 6 | #include <linux/string.h> |
David S. Miller | b80a718 | 2008-02-24 18:45:09 -0800 | [diff] [blame] | 7 | #include <linux/jiffies.h> |
| 8 | #include <linux/timer.h> |
| 9 | #include <linux/uaccess.h> |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 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 | |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 49 | static int led_proc_show(struct seq_file *m, void *v) |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 50 | { |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 51 | if (get_auxio() & AUXIO_LED) |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 52 | seq_puts(m, "on\n"); |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 53 | else |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 54 | seq_puts(m, "off\n"); |
| 55 | return 0; |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 56 | } |
| 57 | |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 58 | static int led_proc_open(struct inode *inode, struct file *file) |
| 59 | { |
| 60 | return single_open(file, led_proc_show, NULL); |
| 61 | } |
| 62 | |
| 63 | static ssize_t led_proc_write(struct file *file, const char __user *buffer, |
| 64 | size_t count, loff_t *ppos) |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 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 | |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 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 | |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 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 | |
Alexey Dobriyan | 399dc43 | 2008-06-03 15:21:21 -0700 | [diff] [blame] | 126 | led = proc_create("led", 0, NULL, &led_proc_fops); |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 127 | if (!led) |
| 128 | return -ENOMEM; |
Lars Kotthoff | ee1858d | 2005-11-07 14:08:04 -0800 | [diff] [blame] | 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); |