cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cbe_powerbutton.c (2408B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * driver for powerbutton on IBM cell blades
      4 *
      5 * (C) Copyright IBM Corp. 2005-2008
      6 *
      7 * Author: Christian Krafft <krafft@de.ibm.com>
      8 */
      9
     10#include <linux/input.h>
     11#include <linux/module.h>
     12#include <linux/of.h>
     13#include <linux/platform_device.h>
     14#include <asm/pmi.h>
     15
     16static struct input_dev *button_dev;
     17static struct platform_device *button_pdev;
     18
     19static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
     20{
     21	BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
     22
     23	input_report_key(button_dev, KEY_POWER, 1);
     24	input_sync(button_dev);
     25	input_report_key(button_dev, KEY_POWER, 0);
     26	input_sync(button_dev);
     27}
     28
     29static struct pmi_handler cbe_pmi_handler = {
     30	.type			= PMI_TYPE_POWER_BUTTON,
     31	.handle_pmi_message	= cbe_powerbutton_handle_pmi,
     32};
     33
     34static int __init cbe_powerbutton_init(void)
     35{
     36	int ret = 0;
     37	struct input_dev *dev;
     38
     39	if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
     40		printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
     41		ret = -ENODEV;
     42		goto out;
     43	}
     44
     45	dev = input_allocate_device();
     46	if (!dev) {
     47		ret = -ENOMEM;
     48		printk(KERN_ERR "%s: Not enough memory.\n", __func__);
     49		goto out;
     50	}
     51
     52	set_bit(EV_KEY, dev->evbit);
     53	set_bit(KEY_POWER, dev->keybit);
     54
     55	dev->name = "Power Button";
     56	dev->id.bustype = BUS_HOST;
     57
     58	/* this makes the button look like an acpi power button
     59	 * no clue whether anyone relies on that though */
     60	dev->id.product = 0x02;
     61	dev->phys = "LNXPWRBN/button/input0";
     62
     63	button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
     64	if (IS_ERR(button_pdev)) {
     65		ret = PTR_ERR(button_pdev);
     66		goto out_free_input;
     67	}
     68
     69	dev->dev.parent = &button_pdev->dev;
     70	ret = input_register_device(dev);
     71	if (ret) {
     72		printk(KERN_ERR "%s: Failed to register device\n", __func__);
     73		goto out_free_pdev;
     74	}
     75
     76	button_dev = dev;
     77
     78	ret = pmi_register_handler(&cbe_pmi_handler);
     79	if (ret) {
     80		printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
     81		goto out_free_pdev;
     82	}
     83
     84	goto out;
     85
     86out_free_pdev:
     87	platform_device_unregister(button_pdev);
     88out_free_input:
     89	input_free_device(dev);
     90out:
     91	return ret;
     92}
     93
     94static void __exit cbe_powerbutton_exit(void)
     95{
     96	pmi_unregister_handler(&cbe_pmi_handler);
     97	platform_device_unregister(button_pdev);
     98	input_free_device(button_dev);
     99}
    100
    101module_init(cbe_powerbutton_init);
    102module_exit(cbe_powerbutton_exit);
    103
    104MODULE_LICENSE("GPL");
    105MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");