1 /* 2 * Input Power Event -> APM Bridge 3 * 4 * Copyright (c) 2007 Richard Purdie 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/module.h> 15 #include <linux/input.h> 16 #include <linux/slab.h> 17 #include <linux/init.h> 18 #include <linux/tty.h> 19 #include <linux/delay.h> 20 #include <linux/pm.h> 21 #include <linux/apm-emulation.h> 22 23 static void system_power_event(unsigned int keycode) 24 { 25 switch (keycode) { 26 case KEY_SUSPEND: 27 apm_queue_event(APM_USER_SUSPEND); 28 pr_info("Requesting system suspend...\n"); 29 break; 30 default: 31 break; 32 } 33 } 34 35 static void apmpower_event(struct input_handle *handle, unsigned int type, 36 unsigned int code, int value) 37 { 38 /* only react on key down events */ 39 if (value != 1) 40 return; 41 42 switch (type) { 43 case EV_PWR: 44 system_power_event(code); 45 break; 46 47 default: 48 break; 49 } 50 } 51 52 static int apmpower_connect(struct input_handler *handler, 53 struct input_dev *dev, 54 const struct input_device_id *id) 55 { 56 struct input_handle *handle; 57 int error; 58 59 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); 60 if (!handle) 61 return -ENOMEM; 62 63 handle->dev = dev; 64 handle->handler = handler; 65 handle->name = "apm-power"; 66 67 error = input_register_handle(handle); 68 if (error) { 69 pr_err("Failed to register input power handler, error %d\n", 70 error); 71 kfree(handle); 72 return error; 73 } 74 75 error = input_open_device(handle); 76 if (error) { 77 pr_err("Failed to open input power device, error %d\n", error); 78 input_unregister_handle(handle); 79 kfree(handle); 80 return error; 81 } 82 83 return 0; 84 } 85 86 static void apmpower_disconnect(struct input_handle *handle) 87 { 88 input_close_device(handle); 89 input_unregister_handle(handle); 90 kfree(handle); 91 } 92 93 static const struct input_device_id apmpower_ids[] = { 94 { 95 .flags = INPUT_DEVICE_ID_MATCH_EVBIT, 96 .evbit = { BIT_MASK(EV_PWR) }, 97 }, 98 { }, 99 }; 100 101 MODULE_DEVICE_TABLE(input, apmpower_ids); 102 103 static struct input_handler apmpower_handler = { 104 .event = apmpower_event, 105 .connect = apmpower_connect, 106 .disconnect = apmpower_disconnect, 107 .name = "apm-power", 108 .id_table = apmpower_ids, 109 }; 110 111 static int __init apmpower_init(void) 112 { 113 return input_register_handler(&apmpower_handler); 114 } 115 116 static void __exit apmpower_exit(void) 117 { 118 input_unregister_handler(&apmpower_handler); 119 } 120 121 module_init(apmpower_init); 122 module_exit(apmpower_exit); 123 124 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); 125 MODULE_DESCRIPTION("Input Power Event -> APM Bridge"); 126 MODULE_LICENSE("GPL"); 127