1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Input Power Event -> APM Bridge 4 * 5 * Copyright (c) 2007 Richard Purdie 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/module.h> 11 #include <linux/input.h> 12 #include <linux/slab.h> 13 #include <linux/init.h> 14 #include <linux/tty.h> 15 #include <linux/delay.h> 16 #include <linux/pm.h> 17 #include <linux/apm-emulation.h> 18 19 static void system_power_event(unsigned int keycode) 20 { 21 switch (keycode) { 22 case KEY_SUSPEND: 23 apm_queue_event(APM_USER_SUSPEND); 24 pr_info("Requesting system suspend...\n"); 25 break; 26 default: 27 break; 28 } 29 } 30 31 static void apmpower_event(struct input_handle *handle, unsigned int type, 32 unsigned int code, int value) 33 { 34 /* only react on key down events */ 35 if (value != 1) 36 return; 37 38 switch (type) { 39 case EV_PWR: 40 system_power_event(code); 41 break; 42 43 default: 44 break; 45 } 46 } 47 48 static int apmpower_connect(struct input_handler *handler, 49 struct input_dev *dev, 50 const struct input_device_id *id) 51 { 52 struct input_handle *handle; 53 int error; 54 55 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); 56 if (!handle) 57 return -ENOMEM; 58 59 handle->dev = dev; 60 handle->handler = handler; 61 handle->name = "apm-power"; 62 63 error = input_register_handle(handle); 64 if (error) { 65 pr_err("Failed to register input power handler, error %d\n", 66 error); 67 kfree(handle); 68 return error; 69 } 70 71 error = input_open_device(handle); 72 if (error) { 73 pr_err("Failed to open input power device, error %d\n", error); 74 input_unregister_handle(handle); 75 kfree(handle); 76 return error; 77 } 78 79 return 0; 80 } 81 82 static void apmpower_disconnect(struct input_handle *handle) 83 { 84 input_close_device(handle); 85 input_unregister_handle(handle); 86 kfree(handle); 87 } 88 89 static const struct input_device_id apmpower_ids[] = { 90 { 91 .flags = INPUT_DEVICE_ID_MATCH_EVBIT, 92 .evbit = { BIT_MASK(EV_PWR) }, 93 }, 94 { }, 95 }; 96 97 MODULE_DEVICE_TABLE(input, apmpower_ids); 98 99 static struct input_handler apmpower_handler = { 100 .event = apmpower_event, 101 .connect = apmpower_connect, 102 .disconnect = apmpower_disconnect, 103 .name = "apm-power", 104 .id_table = apmpower_ids, 105 }; 106 107 static int __init apmpower_init(void) 108 { 109 return input_register_handler(&apmpower_handler); 110 } 111 112 static void __exit apmpower_exit(void) 113 { 114 input_unregister_handler(&apmpower_handler); 115 } 116 117 module_init(apmpower_init); 118 module_exit(apmpower_exit); 119 120 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); 121 MODULE_DESCRIPTION("Input Power Event -> APM Bridge"); 122 MODULE_LICENSE("GPL"); 123