mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Dmitry Torokhov
44098c590b
Rework the driver to use modern style: - Remove global state by introducing a per-device structure - Use devm for resource management (input device allocation) - Use dev_err_probe() for error reporting in the probe path - Clean up unused definitions and headers. Assisted-by: Gemini:gemini-3.1-pro Link: https://patch.msgid.link/ahp6qt_viW3l-NlX@google.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
149 lines
3.7 KiB
C
149 lines
3.7 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/platform_device.h>
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#define ACPI_ATLAS_NAME "Atlas ACPI"
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struct atlas_btns {
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struct input_dev *input_dev;
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unsigned short keymap[16];
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};
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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,
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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,
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void *region_context)
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{
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struct atlas_btns *atlas = region_context;
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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(atlas->input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(atlas->input_dev, atlas->keymap[code],
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key_down);
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input_sync(atlas->input_dev);
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return AE_OK;
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}
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dev_warn(atlas->input_dev->dev.parent,
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"unexpected function: function=%x,address=%lx,value=%x\n",
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function, (unsigned long)address, (u32)*value);
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return AE_BAD_PARAMETER;
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}
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static int atlas_acpi_button_probe(struct platform_device *pdev)
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{
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struct acpi_device *device;
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struct atlas_btns *atlas;
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struct input_dev *input_dev;
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acpi_status status;
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int i;
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int err;
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device = ACPI_COMPANION(&pdev->dev);
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if (!device)
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return -ENODEV;
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atlas = devm_kzalloc(&pdev->dev, sizeof(*atlas), GFP_KERNEL);
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if (!atlas)
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return -ENOMEM;
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input_dev = devm_input_allocate_device(&pdev->dev);
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if (!input_dev)
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return -ENOMEM;
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atlas->input_dev = input_dev;
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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(atlas->keymap[0]);
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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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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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input_set_capability(input_dev, EV_KEY, KEY_F1 + i);
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} else {
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atlas->keymap[i] = KEY_RESERVED;
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}
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}
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err = input_register_device(input_dev);
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if (err)
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return dev_err_probe(&pdev->dev, err,
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"couldn't register input device\n");
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/* hookup button handler */
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status = acpi_install_address_space_handler(device->handle,
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0x81,
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&acpi_atlas_button_handler,
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&acpi_atlas_button_setup,
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atlas);
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if (ACPI_FAILURE(status))
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return dev_err_probe(&pdev->dev, -EINVAL,
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"error installing addr spc handler\n");
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return 0;
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}
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static void atlas_acpi_button_remove(struct platform_device *pdev)
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{
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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acpi_remove_address_space_handler(device->handle, 0x81,
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&acpi_atlas_button_handler);
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}
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static const struct acpi_device_id atlas_device_ids[] = {
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{ "ASIM0000" },
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{ "" }
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};
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MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
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static struct platform_driver atlas_acpi_driver = {
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.probe = atlas_acpi_button_probe,
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.remove = atlas_acpi_button_remove,
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.driver = {
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.name = ACPI_ATLAS_NAME,
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.acpi_match_table = atlas_device_ids,
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},
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};
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module_platform_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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