123 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Input Power Event -> APM Bridge4 *5 * Copyright (c) 2007 Richard Purdie6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 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 19static 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 31static 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 48static 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 82static void apmpower_disconnect(struct input_handle *handle)83{84 input_close_device(handle);85 input_unregister_handle(handle);86 kfree(handle);87}88 89static 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 97MODULE_DEVICE_TABLE(input, apmpower_ids);98 99static 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 107static int __init apmpower_init(void)108{109 return input_register_handler(&apmpower_handler);110}111 112static void __exit apmpower_exit(void)113{114 input_unregister_handler(&apmpower_handler);115}116 117module_init(apmpower_init);118module_exit(apmpower_exit);119 120MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");121MODULE_DESCRIPTION("Input Power Event -> APM Bridge");122MODULE_LICENSE("GPL");123