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