arch/powerpc/platforms/cell/cbe_powerbutton.c

   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 <[email protected]>
   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
  16 static struct input_dev *button_dev;
  17 static struct platform_device *button_pdev;
  18
  19 static 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
  29 static struct pmi_handler cbe_pmi_handler = {
  30         .type                   = PMI_TYPE_POWER_BUTTON,
  31         .handle_pmi_message     = cbe_powerbutton_handle_pmi,
  32 };
  33
  34 static 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
  86 out_free_pdev:
  87         platform_device_unregister(button_pdev);
  88 out_free_input:
  89         input_free_device(dev);
  90 out:
  91         return ret;
  92 }
  93
  94 static 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
 101 module_init(cbe_powerbutton_init);
 102 module_exit(cbe_powerbutton_exit);
 103
 104 MODULE_DESCRIPTION("Driver for powerbutton on IBM cell blades");
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("Christian Krafft <[email protected]>");