drivers/input/apm-power.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  Input Power Event -> APM Bridge
0004  *
0005  *  Copyright (c) 2007 Richard Purdie
0006  */
0007
0008 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0009
0010 #include <linux/module.h>
0011 #include <linux/input.h>
0012 #include <linux/slab.h>
0013 #include <linux/init.h>
0014 #include <linux/tty.h>
0015 #include <linux/delay.h>
0016 #include <linux/pm.h>
0017 #include <linux/apm-emulation.h>
0018
0019 static void system_power_event(unsigned int keycode)
0020 {
0021     switch (keycode) {
0022     case KEY_SUSPEND:
0023         apm_queue_event(APM_USER_SUSPEND);
0024         pr_info("Requesting system suspend...\n");
0025         break;
0026     default:
0027         break;
0028     }
0029 }
0030
0031 static void apmpower_event(struct input_handle *handle, unsigned int type,
0032                unsigned int code, int value)
0033 {
0034     /* only react on key down events */
0035     if (value != 1)
0036         return;
0037
0038     switch (type) {
0039     case EV_PWR:
0040         system_power_event(code);
0041         break;
0042
0043     default:
0044         break;
0045     }
0046 }
0047
0048 static int apmpower_connect(struct input_handler *handler,
0049                       struct input_dev *dev,
0050                       const struct input_device_id *id)
0051 {
0052     struct input_handle *handle;
0053     int error;
0054
0055     handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
0056     if (!handle)
0057         return -ENOMEM;
0058
0059     handle->dev = dev;
0060     handle->handler = handler;
0061     handle->name = "apm-power";
0062
0063     error = input_register_handle(handle);
0064     if (error) {
0065         pr_err("Failed to register input power handler, error %d\n",
0066                error);
0067         kfree(handle);
0068         return error;
0069     }
0070
0071     error = input_open_device(handle);
0072     if (error) {
0073         pr_err("Failed to open input power device, error %d\n", error);
0074         input_unregister_handle(handle);
0075         kfree(handle);
0076         return error;
0077     }
0078
0079     return 0;
0080 }
0081
0082 static void apmpower_disconnect(struct input_handle *handle)
0083 {
0084     input_close_device(handle);
0085     input_unregister_handle(handle);
0086     kfree(handle);
0087 }
0088
0089 static const struct input_device_id apmpower_ids[] = {
0090     {
0091         .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
0092         .evbit = { BIT_MASK(EV_PWR) },
0093     },
0094     { },
0095 };
0096
0097 MODULE_DEVICE_TABLE(input, apmpower_ids);
0098
0099 static struct input_handler apmpower_handler = {
0100     .event =    apmpower_event,
0101     .connect =  apmpower_connect,
0102     .disconnect =   apmpower_disconnect,
0103     .name =     "apm-power",
0104     .id_table = apmpower_ids,
0105 };
0106
0107 static int __init apmpower_init(void)
0108 {
0109     return input_register_handler(&apmpower_handler);
0110 }
0111
0112 static void __exit apmpower_exit(void)
0113 {
0114     input_unregister_handler(&apmpower_handler);
0115 }
0116
0117 module_init(apmpower_init);
0118 module_exit(apmpower_exit);
0119
0120 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
0121 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
0122 MODULE_LICENSE("GPL");