arch/arm/mach-ixp4xx/nas100d-power.c

   1 /*
   2  * arch/arm/mach-ixp4xx/nas100d-power.c
   3  *
   4  * NAS 100d Power/Reset driver
   5  *
   6  * Copyright (C) 2005 Tower Technologies
   7  *
   8  * based on nas100d-io.c
   9  *  Copyright (C) 2004 Karen Spearel
  10  *
  11  * Author: Alessandro Zummo <a.zummo@towertech.it>
  12  * Maintainers: http://www.nslu2-linux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/reboot.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <asm/mach-types.h>
  25
  26 extern void ctrl_alt_del(void);
  27
  28 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id, struct pt_regs *regs)
  29 {
  30         /* Signal init to do the ctrlaltdel action, this will bypass init if
  31          * it hasn't started and do a kernel_restart.
  32          */
  33         ctrl_alt_del();
  34
  35         return IRQ_HANDLED;
  36 }
  37
  38 static int __init nas100d_power_init(void)
  39 {
  40         if (!(machine_is_nas100d()))
  41                 return 0;
  42
  43         set_irq_type(NAS100D_RB_IRQ, IRQT_LOW);
  44
  45         if (request_irq(NAS100D_RB_IRQ, &nas100d_reset_handler,
  46                 SA_INTERRUPT, "NAS100D reset button", NULL) < 0) {
  47
  48                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
  49                         NAS100D_RB_IRQ);
  50
  51                 return -EIO;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static void __exit nas100d_power_exit(void)
  58 {
  59         if (!(machine_is_nas100d()))
  60                 return;
  61
  62         free_irq(NAS100D_RB_IRQ, NULL);
  63 }
  64
  65 module_init(nas100d_power_init);
  66 module_exit(nas100d_power_exit);
  67
  68 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  69 MODULE_DESCRIPTION("NAS100D Power/Reset driver");
  70 MODULE_LICENSE("GPL");