// SPDX-License-Identifier: GPL-2.0-or-later/* *  atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras * *  Copyright (C) 2006 Jaya Kumar *  Based on Toshiba ACPI by John Belmonte and ASUS ACPI *  This work was sponsored by CIS(M) Sdn Bhd. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h>#include <linux/module.h>#include <linux/input.h>#include <linux/types.h>#include <linux/acpi.h>#include <linux/platform_device.h> #define ACPI_ATLAS_NAME		"Atlas ACPI" struct atlas_btns {	struct input_dev *input_dev;	unsigned short keymap[16];}; /* button handling code */static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,					   u32 function, void *handler_context,					   void **return_context){	*return_context =		(function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL; 	return AE_OK;} static acpi_status acpi_atlas_button_handler(u32 function,					     acpi_physical_address address,					     u32 bit_width, u64 *value,					     void *handler_context,					     void *region_context){	struct atlas_btns *atlas = region_context; 	if (function == ACPI_WRITE) {		int code = address & 0x0f;		int key_down = !(address & 0x10); 		input_event(atlas->input_dev, EV_MSC, MSC_SCAN, code);		input_report_key(atlas->input_dev, atlas->keymap[code],				 key_down);		input_sync(atlas->input_dev); 		return AE_OK;	} 	dev_warn(atlas->input_dev->dev.parent,		 "unexpected function: function=%x,address=%lx,value=%x\n",		 function, (unsigned long)address, (u32)*value); 	return AE_BAD_PARAMETER;} static int atlas_acpi_button_probe(struct platform_device *pdev){	struct acpi_device *device;	struct atlas_btns *atlas;	struct input_dev *input_dev;	acpi_status status;	int i;	int err; 	device = ACPI_COMPANION(&pdev->dev);	if (!device)		return -ENODEV; 	atlas = devm_kzalloc(&pdev->dev, sizeof(*atlas), GFP_KERNEL);	if (!atlas)		return -ENOMEM; 	input_dev = devm_input_allocate_device(&pdev->dev);	if (!input_dev)		return -ENOMEM; 	atlas->input_dev = input_dev; 	input_dev->name = "Atlas ACPI button driver";	input_dev->phys = "ASIM0000/atlas/input0";	input_dev->id.bustype = BUS_HOST;	input_dev->keycode = atlas->keymap;	input_dev->keycodesize = sizeof(atlas->keymap[0]);	input_dev->keycodemax = ARRAY_SIZE(atlas->keymap); 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);	for (i = 0; i < ARRAY_SIZE(atlas->keymap); i++) {		if (i < 9) {			atlas->keymap[i] = KEY_F1 + i;			input_set_capability(input_dev, EV_KEY, KEY_F1 + i);		} else {			atlas->keymap[i] = KEY_RESERVED;		}	} 	err = input_register_device(input_dev);	if (err)		return dev_err_probe(&pdev->dev, err,				     "couldn't register input device\n"); 	/* hookup button handler */	status = acpi_install_address_space_handler(device->handle,						    0x81,						    &acpi_atlas_button_handler,						    &acpi_atlas_button_setup,						    atlas);	if (ACPI_FAILURE(status))		return dev_err_probe(&pdev->dev, -EINVAL,				     "error installing addr spc handler\n"); 	return 0;} static void atlas_acpi_button_remove(struct platform_device *pdev){	struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 	acpi_remove_address_space_handler(device->handle, 0x81,					  &acpi_atlas_button_handler);} static const struct acpi_device_id atlas_device_ids[] = {	{ "ASIM0000" },	{ "" }};MODULE_DEVICE_TABLE(acpi, atlas_device_ids); static struct platform_driver atlas_acpi_driver = {	.probe = atlas_acpi_button_probe,	.remove = atlas_acpi_button_remove,	.driver = {		.name = ACPI_ATLAS_NAME,		.acpi_match_table = atlas_device_ids,	},};module_platform_driver(atlas_acpi_driver); MODULE_AUTHOR("Jaya Kumar");MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Atlas button driver");