fs/proc/interrupts.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/fs.h>
   3 #include <linux/init.h>
   4 #include <linux/interrupt.h>
   5 #include <linux/irqnr.h>
   6 #include <linux/proc_fs.h>
   7 #include <linux/seq_file.h>
   8
   9 /*
  10  * /proc/interrupts
  11  */
  12 static void *int_seq_start(struct seq_file *f, loff_t *pos)
  13 {
  14         return (*pos <= nr_irqs) ? pos : NULL;
  15 }
  16
  17 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
  18 {
  19         (*pos)++;
  20         if (*pos > nr_irqs)
  21                 return NULL;
  22         return pos;
  23 }
  24
  25 static void int_seq_stop(struct seq_file *f, void *v)
  26 {
  27         /* Nothing to do */
  28 }
  29
  30 static const struct seq_operations int_seq_ops = {
  31         .start = int_seq_start,
  32         .next  = int_seq_next,
  33         .stop  = int_seq_stop,
  34         .show  = show_interrupts
  35 };
  36
  37 static int interrupts_open(struct inode *inode, struct file *filp)
  38 {
  39         return seq_open(filp, &int_seq_ops);
  40 }
  41
  42 static const struct file_operations proc_interrupts_operations = {
  43         .open           = interrupts_open,
  44         .read           = seq_read,
  45         .llseek         = seq_lseek,
  46         .release        = seq_release,
  47 };
  48
  49 static int __init proc_interrupts_init(void)
  50 {
  51         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
  52         return 0;
  53 }
  54 fs_initcall(proc_interrupts_init);