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/*
* driver for powerbutton on IBM cell blades
*
* (C) Copyright IBM Corp. 2005-2008
*
* Author: Christian Krafft <krafft@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <asm/pmi.h>
#include <asm/prom.h>
static struct input_dev *button_dev;
static struct platform_device *button_pdev;
static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
{
BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
input_report_key(button_dev, KEY_POWER, 1);
input_sync(button_dev);
input_report_key(button_dev, KEY_POWER, 0);
input_sync(button_dev);
}
static struct pmi_handler cbe_pmi_handler = {
.type = PMI_TYPE_POWER_BUTTON,
.handle_pmi_message = cbe_powerbutton_handle_pmi,
};
static int __init cbe_powerbutton_init(void)
{
int ret = 0;
struct input_dev *dev;
if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
printk(KERN_ERR "%s: Not a cell blade.
", __func__);
ret = -ENODEV;
goto out;
}
dev = input_allocate_device();
if (!dev) {
ret = -ENOMEM;
printk(KERN_ERR "%s: Not enough memory.
", __func__);
goto out;
}
set_bit(EV_KEY, dev->evbit);
set_bit(KEY_POWER, dev->keybit);
dev->name = "Power Button";
dev->id.bustype = BUS_HOST;
/* this makes the button look like an acpi power button
* no clue whether anyone relies on that though */
dev->id.product = 0x02;
dev->phys = "LNXPWRBN/button/input0";
button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
if (IS_ERR(button_pdev)) {
ret = PTR_ERR(button_pdev);
goto out_free_input;
}
dev->dev.parent = &button_pdev->dev;
ret = input_register_device(dev);
if (ret) {
printk(KERN_ERR "%s: Failed to register device
", __func__);
goto out_free_pdev;
}
button_dev = dev;
ret = pmi_register_handler(&cbe_pmi_handler);
if (ret) {
printk(KERN_ERR "%s: Failed to register with pmi.
", __func__);
goto out_free_pdev;
}
goto out;
out_free_pdev:
platform_device_unregister(button_pdev);
out_free_input:
input_free_device(dev);
out:
return ret;
}
static void __exit cbe_powerbutton_exit(void)
{
pmi_unregister_handler(&cbe_pmi_handler);
platform_device_unregister(button_pdev);
input_free_device(button_dev);
}
module_init(cbe_powerbutton_init);
module_exit(cbe_powerbutton_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
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