arch/powerpc/platforms/cell/cbe_powerbutton.c

   1 /*
   2  * driver for powerbutton on IBM cell blades
   3  *
   4  * (C) Copyright IBM Corp. 2005-2008
   5  *
   6  * Author: Christian Krafft <krafft@de.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/input.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <asm/pmi.h>
  27 #include <asm/prom.h>
  28
  29 static struct input_dev *button_dev;
  30 static struct platform_device *button_pdev;
  31
  32 static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
  33 {
  34         BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
  35
  36         input_report_key(button_dev, KEY_POWER, 1);
  37         input_sync(button_dev);
  38         input_report_key(button_dev, KEY_POWER, 0);
  39         input_sync(button_dev);
  40 }
  41
  42 static struct pmi_handler cbe_pmi_handler = {
  43         .type                   = PMI_TYPE_POWER_BUTTON,
  44         .handle_pmi_message     = cbe_powerbutton_handle_pmi,
  45 };
  46
  47 static int __init cbe_powerbutton_init(void)
  48 {
  49         int ret = 0;
  50         struct input_dev *dev;
  51
  52         if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
  53                 printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
  54                 ret = -ENODEV;
  55                 goto out;
  56         }
  57
  58         dev = input_allocate_device();
  59         if (!dev) {
  60                 ret = -ENOMEM;
  61                 printk(KERN_ERR "%s: Not enough memory.\n", __func__);
  62                 goto out;
  63         }
  64
  65         set_bit(EV_KEY, dev->evbit);
  66         set_bit(KEY_POWER, dev->keybit);
  67
  68         dev->name = "Power Button";
  69         dev->id.bustype = BUS_HOST;
  70
  71         /* this makes the button look like an acpi power button
  72          * no clue whether anyone relies on that though */
  73         dev->id.product = 0x02;
  74         dev->phys = "LNXPWRBN/button/input0";
  75
  76         button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
  77         if (IS_ERR(button_pdev)) {
  78                 ret = PTR_ERR(button_pdev);
  79                 goto out_free_input;
  80         }
  81
  82         dev->dev.parent = &button_pdev->dev;
  83         ret = input_register_device(dev);
  84         if (ret) {
  85                 printk(KERN_ERR "%s: Failed to register device\n", __func__);
  86                 goto out_free_pdev;
  87         }
  88
  89         button_dev = dev;
  90
  91         ret = pmi_register_handler(&cbe_pmi_handler);
  92         if (ret) {
  93                 printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
  94                 goto out_free_pdev;
  95         }
  96
  97         goto out;
  98
  99 out_free_pdev:
 100         platform_device_unregister(button_pdev);
 101 out_free_input:
 102         input_free_device(dev);
 103 out:
 104         return ret;
 105 }
 106
 107 static void __exit cbe_powerbutton_exit(void)
 108 {
 109         pmi_unregister_handler(&cbe_pmi_handler);
 110         platform_device_unregister(button_pdev);
 111         input_free_device(button_dev);
 112 }
 113
 114 module_init(cbe_powerbutton_init);
 115 module_exit(cbe_powerbutton_exit);
 116
 117 MODULE_LICENSE("GPL");
 118 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");