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/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/module.h>
  23 #include <linux/reboot.h>
  24
  25 #include <asm/mach-types.h>
  26
  27 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id, struct pt_regs *regs)
  28 {
  29         /* Signal init to do the ctrlaltdel action, this will bypass init if
  30          * it hasn't started and do a kernel_restart.
  31          */
  32         ctrl_alt_del();
  33
  34         return IRQ_HANDLED;
  35 }
  36
  37 static int __init nas100d_power_init(void)
  38 {
  39         if (!(machine_is_nas100d()))
  40                 return 0;
  41
  42         set_irq_type(NAS100D_RB_IRQ, IRQT_LOW);
  43
  44         if (request_irq(NAS100D_RB_IRQ, &nas100d_reset_handler,
  45                 IRQF_DISABLED, "NAS100D reset button", NULL) < 0) {
  46
  47                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
  48                         NAS100D_RB_IRQ);
  49
  50                 return -EIO;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static void __exit nas100d_power_exit(void)
  57 {
  58         if (!(machine_is_nas100d()))
  59                 return;
  60
  61         free_irq(NAS100D_RB_IRQ, NULL);
  62 }
  63
  64 module_init(nas100d_power_init);
  65 module_exit(nas100d_power_exit);
  66
  67 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  68 MODULE_DESCRIPTION("NAS100D Power/Reset driver");
  69 MODULE_LICENSE("GPL");