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/platform_device.h>
  25 #include <asm/pmi.h>
  26 #include <asm/prom.h>
  27
  28 static struct input_dev *button_dev;
  29 static struct platform_device *button_pdev;
  30
  31 static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
  32 {
  33         BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
  34
  35         input_report_key(button_dev, KEY_POWER, 1);
  36         input_sync(button_dev);
  37         input_report_key(button_dev, KEY_POWER, 0);
  38         input_sync(button_dev);
  39 }
  40
  41 static struct pmi_handler cbe_pmi_handler = {
  42         .type                   = PMI_TYPE_POWER_BUTTON,
  43         .handle_pmi_message     = cbe_powerbutton_handle_pmi,
  44 };
  45
  46 static int __init cbe_powerbutton_init(void)
  47 {
  48         int ret = 0;
  49         struct input_dev *dev;
  50
  51         if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
  52                 printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
  53                 ret = -ENODEV;
  54                 goto out;
  55         }
  56
  57         dev = input_allocate_device();
  58         if (!dev) {
  59                 ret = -ENOMEM;
  60                 printk(KERN_ERR "%s: Not enough memory.\n", __func__);
  61                 goto out;
  62         }
  63
  64         set_bit(EV_KEY, dev->evbit);
  65         set_bit(KEY_POWER, dev->keybit);
  66
  67         dev->name = "Power Button";
  68         dev->id.bustype = BUS_HOST;
  69
  70         /* this makes the button look like an acpi power button
  71          * no clue whether anyone relies on that though */
  72         dev->id.product = 0x02;
  73         dev->phys = "LNXPWRBN/button/input0";
  74
  75         button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
  76         if (IS_ERR(button_pdev)) {
  77                 ret = PTR_ERR(button_pdev);
  78                 goto out_free_input;
  79         }
  80
  81         dev->dev.parent = &button_pdev->dev;
  82         ret = input_register_device(dev);
  83         if (ret) {
  84                 printk(KERN_ERR "%s: Failed to register device\n", __func__);
  85                 goto out_free_pdev;
  86         }
  87
  88         button_dev = dev;
  89
  90         ret = pmi_register_handler(&cbe_pmi_handler);
  91         if (ret) {
  92                 printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
  93                 goto out_free_pdev;
  94         }
  95
  96         goto out;
  97
  98 out_free_pdev:
  99         platform_device_unregister(button_pdev);
 100 out_free_input:
 101         input_free_device(dev);
 102 out:
 103         return ret;
 104 }
 105
 106 static void __exit cbe_powerbutton_exit(void)
 107 {
 108         pmi_unregister_handler(&cbe_pmi_handler);
 109         platform_device_unregister(button_pdev);
 110         input_free_device(button_dev);
 111 }
 112
 113 module_init(cbe_powerbutton_init);
 114 module_exit(cbe_powerbutton_exit);
 115
 116 MODULE_LICENSE("GPL");
 117 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");