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Linux/arch/sparc/kernel/led.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 #include <linux/kernel.h>
  3 #include <linux/module.h>
  4 #include <linux/init.h>
  5 #include <linux/proc_fs.h>
  6 #include <linux/seq_file.h>
  7 #include <linux/slab.h>
  8 #include <linux/string.h>
  9 #include <linux/jiffies.h>
 10 #include <linux/timer.h>
 11 #include <linux/uaccess.h>
 12 #include <linux/sched/loadavg.h>
 13 
 14 #include <asm/auxio.h>
 15 
 16 #define LED_MAX_LENGTH 8 /* maximum chars written to proc file */
 17 
 18 static inline void led_toggle(void)
 19 {
 20         unsigned char val = get_auxio();
 21         unsigned char on, off;
 22 
 23         if (val & AUXIO_LED) {
 24                 on = 0;
 25                 off = AUXIO_LED;
 26         } else {
 27                 on = AUXIO_LED;
 28                 off = 0;
 29         }
 30 
 31         set_auxio(on, off);
 32 }
 33 
 34 static struct timer_list led_blink_timer;
 35 static unsigned long led_blink_timer_timeout;
 36 
 37 static void led_blink(struct timer_list *unused)
 38 {
 39         unsigned long timeout = led_blink_timer_timeout;
 40 
 41         led_toggle();
 42 
 43         /* reschedule */
 44         if (!timeout) { /* blink according to load */
 45                 led_blink_timer.expires = jiffies +
 46                         ((1 + (avenrun[0] >> FSHIFT)) * HZ);
 47         } else { /* blink at user specified interval */
 48                 led_blink_timer.expires = jiffies + (timeout * HZ);
 49         }
 50         add_timer(&led_blink_timer);
 51 }
 52 
 53 static int led_proc_show(struct seq_file *m, void *v)
 54 {
 55         if (get_auxio() & AUXIO_LED)
 56                 seq_puts(m, "on\n");
 57         else
 58                 seq_puts(m, "off\n");
 59         return 0;
 60 }
 61 
 62 static int led_proc_open(struct inode *inode, struct file *file)
 63 {
 64         return single_open(file, led_proc_show, NULL);
 65 }
 66 
 67 static ssize_t led_proc_write(struct file *file, const char __user *buffer,
 68                               size_t count, loff_t *ppos)
 69 {
 70         char *buf = NULL;
 71 
 72         if (count > LED_MAX_LENGTH)
 73                 count = LED_MAX_LENGTH;
 74 
 75         buf = memdup_user_nul(buffer, count);
 76         if (IS_ERR(buf))
 77                 return PTR_ERR(buf);
 78 
 79         /* work around \n when echo'ing into proc */
 80         if (buf[count - 1] == '\n')
 81                 buf[count - 1] = '\0';
 82 
 83         /* before we change anything we want to stop any running timers,
 84          * otherwise calls such as on will have no persistent effect
 85          */
 86         del_timer_sync(&led_blink_timer);
 87 
 88         if (!strcmp(buf, "on")) {
 89                 auxio_set_led(AUXIO_LED_ON);
 90         } else if (!strcmp(buf, "toggle")) {
 91                 led_toggle();
 92         } else if ((*buf > '') && (*buf <= '9')) {
 93                 led_blink_timer_timeout = simple_strtoul(buf, NULL, 10);
 94                 led_blink(&led_blink_timer);
 95         } else if (!strcmp(buf, "load")) {
 96                 led_blink_timer_timeout = 0;
 97                 led_blink(&led_blink_timer);
 98         } else {
 99                 auxio_set_led(AUXIO_LED_OFF);
100         }
101 
102         kfree(buf);
103 
104         return count;
105 }
106 
107 static const struct proc_ops led_proc_ops = {
108         .proc_open      = led_proc_open,
109         .proc_read      = seq_read,
110         .proc_lseek     = seq_lseek,
111         .proc_release   = single_release,
112         .proc_write     = led_proc_write,
113 };
114 
115 static struct proc_dir_entry *led;
116 
117 #define LED_VERSION     "0.1"
118 
119 static int __init led_init(void)
120 {
121         timer_setup(&led_blink_timer, led_blink, 0);
122 
123         led = proc_create("led", 0, NULL, &led_proc_ops);
124         if (!led)
125                 return -ENOMEM;
126 
127         printk(KERN_INFO
128                "led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n",
129                LED_VERSION);
130 
131         return 0;
132 }
133 
134 static void __exit led_exit(void)
135 {
136         remove_proc_entry("led", NULL);
137         del_timer_sync(&led_blink_timer);
138 }
139 
140 module_init(led_init);
141 module_exit(led_exit);
142 
143 MODULE_AUTHOR("Lars Kotthoff <metalhead@metalhead.ws>");
144 MODULE_DESCRIPTION("Provides control of the front LED on SPARC systems.");
145 MODULE_LICENSE("GPL");
146 MODULE_VERSION(LED_VERSION);
147 

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