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b472474e28
Report whether an AMD convertible is in laptop or tablet mode using the operating-mode sensor provided by the Sensor Fusion Hub, and expose it to userspace as SW_TABLET_MODE, so userspace can react to the device being folded into tablet posture. Cc: Helge Bahmann <hcb@chaoticmind.net> Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.com>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AMD SFH tablet-mode switch driver
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*
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* Copyright (c) 2026, Advanced Micro Devices, Inc.
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* All Rights Reserved.
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*
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* Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
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*/
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#include <linux/amd-pmf-io.h>
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#include <linux/auxiliary_bus.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/pci_ids.h>
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#define POLL_INTERVAL_MS 200
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static void sfh_tm_poll(struct input_dev *input)
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{
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struct amd_sfh_info info = {};
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if (amd_get_sfh_info(&info, MT_OP_MODE))
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return;
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input_report_switch(input, SW_TABLET_MODE,
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info.op_mode == SFH_MODE_TABLET);
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input_sync(input);
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}
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static int sfh_tm_probe(struct auxiliary_device *auxdev,
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const struct auxiliary_device_id *id)
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{
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struct device *dev = &auxdev->dev;
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struct amd_sfh_info info = {};
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struct input_dev *input;
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int error;
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error = amd_get_sfh_info(&info, MT_OP_MODE);
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if (error)
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return error == -EINVAL ? -ENODEV : error;
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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input->name = "AMD SFH tablet mode switch";
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input->phys = "amd-sfh/tabletmode";
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input->id.bustype = BUS_HOST;
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input->id.vendor = PCI_VENDOR_ID_AMD;
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input_set_capability(input, EV_SW, SW_TABLET_MODE);
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error = input_setup_polling(input, sfh_tm_poll);
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if (error)
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return error;
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input_set_poll_interval(input, POLL_INTERVAL_MS);
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sfh_tm_poll(input);
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error = input_register_device(input);
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if (error)
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return error;
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return 0;
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}
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static const struct auxiliary_device_id sfh_tm_id_table[] = {
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{ .name = "amd_sfh.tabletmode" },
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{}
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};
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MODULE_DEVICE_TABLE(auxiliary, sfh_tm_id_table);
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static struct auxiliary_driver sfh_tm_driver = {
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.name = "tabletmode",
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.id_table = sfh_tm_id_table,
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.probe = sfh_tm_probe,
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};
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module_auxiliary_driver(sfh_tm_driver);
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MODULE_DESCRIPTION("AMD SFH tablet mode switch");
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MODULE_LICENSE("GPL");
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