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/platform_device.h> 13 #include <asm/pmi.h> 14 #include <asm/prom.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_LICENSE("GPL"); 105 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>"); 106