143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras
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*
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* Copyright (C) 2006 Jaya Kumar
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* Based on Toshiba ACPI by John Belmonte and ASUS ACPI
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* This work was sponsored by CIS(M) Sdn Bhd.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/uaccess.h>
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#define ACPI_ATLAS_NAME "Atlas ACPI"
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#define ACPI_ATLAS_CLASS "Atlas"
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static unsigned short atlas_keymap[16];
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static struct input_dev *input_dev;
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/* button handling code */
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static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
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u32 function, void *handler_context, void **return_context)
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{
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*return_context =
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(function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
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return AE_OK;
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}
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static acpi_status acpi_atlas_button_handler(u32 function,
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acpi_physical_address address,
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u32 bit_width, u64 *value,
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void *handler_context, void *region_context)
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{
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acpi_status status;
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if (function == ACPI_WRITE) {
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int code = address & 0x0f;
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int key_down = !(address & 0x10);
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, atlas_keymap[code], key_down);
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input_sync(input_dev);
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status = AE_OK;
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} else {
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pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n",
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function, (unsigned long)address, (u32)*value);
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status = AE_BAD_PARAMETER;
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}
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return status;
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}
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static int atlas_acpi_button_add(struct acpi_device *device)
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{
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acpi_status status;
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int i;
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int err;
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input_dev = input_allocate_device();
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if (!input_dev) {
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pr_err("unable to allocate input device\n");
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return -ENOMEM;
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}
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input_dev->name = "Atlas ACPI button driver";
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input_dev->phys = "ASIM0000/atlas/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->keycode = atlas_keymap;
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input_dev->keycodesize = sizeof(unsigned short);
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input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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__set_bit(EV_KEY, input_dev->evbit);
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for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
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if (i < 9) {
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atlas_keymap[i] = KEY_F1 + i;
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__set_bit(KEY_F1 + i, input_dev->keybit);
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} else
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atlas_keymap[i] = KEY_RESERVED;
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}
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err = input_register_device(input_dev);
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if (err) {
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pr_err("couldn't register input device\n");
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input_free_device(input_dev);
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return err;
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}
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/* hookup button handler */
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status = acpi_install_address_space_handler(device->handle,
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0x81, &acpi_atlas_button_handler,
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&acpi_atlas_button_setup, device);
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if (ACPI_FAILURE(status)) {
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pr_err("error installing addr spc handler\n");
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input_unregister_device(input_dev);
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err = -EINVAL;
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}
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return err;
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}
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static void atlas_acpi_button_remove(struct acpi_device *device)
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{
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acpi_status status;
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status = acpi_remove_address_space_handler(device->handle,
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0x81, &acpi_atlas_button_handler);
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if (ACPI_FAILURE(status))
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pr_err("error removing addr spc handler\n");
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input_unregister_device(input_dev);
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}
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static const struct acpi_device_id atlas_device_ids[] = {
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{"ASIM0000", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
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static struct acpi_driver atlas_acpi_driver = {
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.name = ACPI_ATLAS_NAME,
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.class = ACPI_ATLAS_CLASS,
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.owner = THIS_MODULE,
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.ids = atlas_device_ids,
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.ops = {
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.add = atlas_acpi_button_add,
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.remove = atlas_acpi_button_remove,
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},
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};
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module_acpi_driver(atlas_acpi_driver);
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MODULE_AUTHOR("Jaya Kumar");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Atlas button driver");
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