106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* driver for powerbutton on IBM cell blades
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*
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* (C) Copyright IBM Corp. 2005-2008
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <asm/pmi.h>
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static struct input_dev *button_dev;
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static struct platform_device *button_pdev;
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static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
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{
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BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
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input_report_key(button_dev, KEY_POWER, 1);
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input_sync(button_dev);
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input_report_key(button_dev, KEY_POWER, 0);
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input_sync(button_dev);
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}
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static struct pmi_handler cbe_pmi_handler = {
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.type = PMI_TYPE_POWER_BUTTON,
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.handle_pmi_message = cbe_powerbutton_handle_pmi,
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};
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static int __init cbe_powerbutton_init(void)
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{
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int ret = 0;
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struct input_dev *dev;
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if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
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printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
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ret = -ENODEV;
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goto out;
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}
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dev = input_allocate_device();
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if (!dev) {
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ret = -ENOMEM;
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printk(KERN_ERR "%s: Not enough memory.\n", __func__);
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goto out;
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}
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set_bit(EV_KEY, dev->evbit);
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set_bit(KEY_POWER, dev->keybit);
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dev->name = "Power Button";
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dev->id.bustype = BUS_HOST;
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/* this makes the button look like an acpi power button
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* no clue whether anyone relies on that though */
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dev->id.product = 0x02;
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dev->phys = "LNXPWRBN/button/input0";
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button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
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if (IS_ERR(button_pdev)) {
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ret = PTR_ERR(button_pdev);
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goto out_free_input;
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}
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dev->dev.parent = &button_pdev->dev;
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ret = input_register_device(dev);
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if (ret) {
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printk(KERN_ERR "%s: Failed to register device\n", __func__);
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goto out_free_pdev;
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}
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button_dev = dev;
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ret = pmi_register_handler(&cbe_pmi_handler);
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if (ret) {
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printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
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goto out_free_pdev;
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}
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goto out;
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out_free_pdev:
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platform_device_unregister(button_pdev);
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out_free_input:
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input_free_device(dev);
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out:
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return ret;
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}
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static void __exit cbe_powerbutton_exit(void)
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{
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pmi_unregister_handler(&cbe_pmi_handler);
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platform_device_unregister(button_pdev);
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input_free_device(button_dev);
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}
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module_init(cbe_powerbutton_init);
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module_exit(cbe_powerbutton_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
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