LXR linux/arch/powerpc/platforms/cell/cbe

   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
  28static struct input_dev *button_dev;
  29static struct platform_device *button_pdev;
  30
  31static 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
  41static struct pmi_handler cbe_pmi_handler = {
  42        .type                   = PMI_TYPE_POWER_BUTTON,
  43        .handle_pmi_message     = cbe_powerbutton_handle_pmi,
  44};
  45
  46static 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
  98out_free_pdev:
  99        platform_device_unregister(button_pdev);
 100out_free_input:
 101        input_free_device(dev);
 102out:
 103        return ret;
 104}
 105
 106static 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
 113module_init(cbe_powerbutton_init);
 114module_exit(cbe_powerbutton_exit);
 115
 116MODULE_LICENSE("GPL");
 117MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
 118