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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AMD SFH tablet-mode switch driver
*
* Copyright (c) 2026, Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
*/
#include <linux/amd-pmf-io.h>
#include <linux/auxiliary_bus.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/pci_ids.h>
#define POLL_INTERVAL_MS 200
static void sfh_tm_poll(struct input_dev *input)
{
struct amd_sfh_info info = {};
if (amd_get_sfh_info(&info, MT_OP_MODE))
return;
input_report_switch(input, SW_TABLET_MODE,
info.op_mode == SFH_MODE_TABLET);
input_sync(input);
}
static int sfh_tm_probe(struct auxiliary_device *auxdev,
const struct auxiliary_device_id *id)
{
struct device *dev = &auxdev->dev;
struct amd_sfh_info info = {};
struct input_dev *input;
int error;
error = amd_get_sfh_info(&info, MT_OP_MODE);
if (error)
return error == -EINVAL ? -ENODEV : error;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
input->name = "AMD SFH tablet mode switch";
input->phys = "amd-sfh/tabletmode";
input->id.bustype = BUS_HOST;
input->id.vendor = PCI_VENDOR_ID_AMD;
input_set_capability(input, EV_SW, SW_TABLET_MODE);
error = input_setup_polling(input, sfh_tm_poll);
if (error)
return error;
input_set_poll_interval(input, POLL_INTERVAL_MS);
sfh_tm_poll(input);
error = input_register_device(input);
if (error)
return error;
return 0;
}
static const struct auxiliary_device_id sfh_tm_id_table[] = {
{ .name = "amd_sfh.tabletmode" },
{}
};
MODULE_DEVICE_TABLE(auxiliary, sfh_tm_id_table);
static struct auxiliary_driver sfh_tm_driver = {
.name = "tabletmode",
.id_table = sfh_tm_id_table,
.probe = sfh_tm_probe,
};
module_auxiliary_driver(sfh_tm_driver);
MODULE_DESCRIPTION("AMD SFH tablet mode switch");
MODULE_LICENSE("GPL");
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