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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | // SPDX-License-Identifier: GPL-2.0-only #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/jiffies.h> #include <linux/timer.h> #include <linux/uaccess.h> #include <linux/sched/loadavg.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 unsigned long led_blink_timer_timeout; static void led_blink(struct timer_list *unused) { unsigned long timeout = led_blink_timer_timeout; led_toggle(); /* reschedule */ if (!timeout) { /* blink according to load */ led_blink_timer.expires = jiffies + ((1 + (avenrun[0] >> FSHIFT)) * HZ); } else { /* blink at user specified interval */ led_blink_timer.expires = jiffies + (timeout * HZ); } add_timer(&led_blink_timer); } #ifdef CONFIG_PROC_FS static int led_proc_show(struct seq_file *m, void *v) { if (get_auxio() & AUXIO_LED) seq_puts(m, "on\n"); else seq_puts(m, "off\n"); return 0; } static int led_proc_open(struct inode *inode, struct file *file) { return single_open(file, led_proc_show, NULL); } static ssize_t led_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { char *buf = NULL; if (count > LED_MAX_LENGTH) count = LED_MAX_LENGTH; buf = memdup_user_nul(buffer, count); if (IS_ERR(buf)) return PTR_ERR(buf); /* 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_timer_timeout = simple_strtoul(buf, NULL, 10); led_blink(&led_blink_timer); } else if (!strcmp(buf, "load")) { led_blink_timer_timeout = 0; led_blink(&led_blink_timer); } else { auxio_set_led(AUXIO_LED_OFF); } kfree(buf); return count; } static const struct proc_ops led_proc_ops = { .proc_open = led_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = led_proc_write, }; #endif static struct proc_dir_entry *led; #define LED_VERSION "0.1" static int __init led_init(void) { timer_setup(&led_blink_timer, led_blink, 0); led = proc_create("led", 0, NULL, &led_proc_ops); if (!led) return -ENOMEM; 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); |