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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/uaccess.h>
#define ACPI_ATLAS_NAME "Atlas ACPI"
#define ACPI_ATLAS_CLASS "Atlas"
static unsigned short atlas_keymap[16];
static struct input_dev *input_dev;
/* 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)
{
acpi_status status;
if (function == ACPI_WRITE) {
int code = address & 0x0f;
int key_down = !(address & 0x10);
input_event(input_dev, EV_MSC, MSC_SCAN, code);
input_report_key(input_dev, atlas_keymap[code], key_down);
input_sync(input_dev);
status = AE_OK;
} else {
pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n",
function, (unsigned long)address, (u32)*value);
status = AE_BAD_PARAMETER;
}
return status;
}
static int atlas_acpi_button_add(struct acpi_device *device)
{
acpi_status status;
int i;
int err;
input_dev = input_allocate_device();
if (!input_dev) {
pr_err("unable to allocate input device\n");
return -ENOMEM;
}
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(unsigned short);
input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
input_set_capability(input_dev, EV_MSC, MSC_SCAN);
__set_bit(EV_KEY, input_dev->evbit);
for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
if (i < 9) {
atlas_keymap[i] = KEY_F1 + i;
__set_bit(KEY_F1 + i, input_dev->keybit);
} else
atlas_keymap[i] = KEY_RESERVED;
}
err = input_register_device(input_dev);
if (err) {
pr_err("couldn't register input device\n");
input_free_device(input_dev);
return err;
}
/* hookup button handler */
status = acpi_install_address_space_handler(device->handle,
0x81, &acpi_atlas_button_handler,
&acpi_atlas_button_setup, device);
if (ACPI_FAILURE(status)) {
pr_err("error installing addr spc handler\n");
input_unregister_device(input_dev);
err = -EINVAL;
}
return err;
}
static int atlas_acpi_button_remove(struct acpi_device *device)
{
acpi_status status;
status = acpi_remove_address_space_handler(device->handle,
0x81, &acpi_atlas_button_handler);
if (ACPI_FAILURE(status))
pr_err("error removing addr spc handler\n");
input_unregister_device(input_dev);
return 0;
}
static const struct acpi_device_id atlas_device_ids[] = {
{"ASIM0000", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
static struct acpi_driver atlas_acpi_driver = {
.name = ACPI_ATLAS_NAME,
.class = ACPI_ATLAS_CLASS,
.owner = THIS_MODULE,
.ids = atlas_device_ids,
.ops = {
.add = atlas_acpi_button_add,
.remove = atlas_acpi_button_remove,
},
};
module_acpi_driver(atlas_acpi_driver);
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Atlas button driver");
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