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// 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");
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