linux/arch/powerpc/platforms/cell/cbe_powerbutton.c
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   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
  29static struct input_dev *button_dev;
  30static struct platform_device *button_pdev;
  31
  32static 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
  42static struct pmi_handler cbe_pmi_handler = {
  43        .type                   = PMI_TYPE_POWER_BUTTON,
  44        .handle_pmi_message     = cbe_powerbutton_handle_pmi,
  45};
  46
  47static 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
  99out_free_pdev:
 100        platform_device_unregister(button_pdev);
 101out_free_input:
 102        input_free_device(dev);
 103out:
 104        return ret;
 105}
 106
 107static 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
 114module_init(cbe_powerbutton_init);
 115module_exit(cbe_powerbutton_exit);
 116
 117MODULE_LICENSE("GPL");
 118MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
 119