| 1 | |
| 2 | |
| 3 | * AMD SFH tablet-mode switch driver
|
| 4 | *
|
| 5 | * Copyright (c) 2026, Advanced Micro Devices, Inc.
|
| 6 | * All Rights Reserved.
|
| 7 | *
|
| 8 | * Author: Basavaraj Natikar <[email protected]>
|
| 9 |
|
| 10 |
|
| 11 | #include <linux/amd-pmf-io.h>
|
| 12 | #include <linux/auxiliary_bus.h>
|
| 13 | #include <linux/input.h>
|
| 14 | #include <linux/module.h>
|
| 15 | #include <linux/pci_ids.h>
|
| 16 |
|
| 17 | #define POLL_INTERVAL_MS 200
|
| 18 |
|
| 19 | static void sfh_tm_poll(struct input_dev *input)
|
| 20 | {
|
| 21 | struct amd_sfh_info info = {};
|
| 22 |
|
| 23 | if (amd_get_sfh_info(&info, MT_OP_MODE))
|
| 24 | return;
|
| 25 |
|
| 26 | input_report_switch(input, SW_TABLET_MODE,
|
| 27 | info.op_mode == SFH_MODE_TABLET);
|
| 28 | input_sync(input);
|
| 29 | }
|
| 30 |
|
| 31 | static int sfh_tm_probe(struct auxiliary_device *auxdev,
|
| 32 | const struct auxiliary_device_id *id)
|
| 33 | {
|
| 34 | struct device *dev = &auxdev->dev;
|
| 35 | struct amd_sfh_info info = {};
|
| 36 | struct input_dev *input;
|
| 37 | int error;
|
| 38 |
|
| 39 | error = amd_get_sfh_info(&info, MT_OP_MODE);
|
| 40 | if (error)
|
| 41 | return error == -EINVAL ? -ENODEV : error;
|
| 42 |
|
| 43 | input = devm_input_allocate_device(dev);
|
| 44 | if (!input)
|
| 45 | return -ENOMEM;
|
| 46 |
|
| 47 | input->name = "AMD SFH tablet mode switch";
|
| 48 | input->phys = "amd-sfh/tabletmode";
|
| 49 | input->id.bustype = BUS_HOST;
|
| 50 | input->id.vendor = PCI_VENDOR_ID_AMD;
|
| 51 | input_set_capability(input, EV_SW, SW_TABLET_MODE);
|
| 52 |
|
| 53 | error = input_setup_polling(input, sfh_tm_poll);
|
| 54 | if (error)
|
| 55 | return error;
|
| 56 | input_set_poll_interval(input, POLL_INTERVAL_MS);
|
| 57 |
|
| 58 | sfh_tm_poll(input);
|
| 59 |
|
| 60 | error = input_register_device(input);
|
| 61 | if (error)
|
| 62 | return error;
|
| 63 |
|
| 64 | return 0;
|
| 65 | }
|
| 66 |
|
| 67 | static const struct auxiliary_device_id sfh_tm_id_table[] = {
|
| 68 | { .name = "amd_sfh.tabletmode" },
|
| 69 | {}
|
| 70 | };
|
| 71 | MODULE_DEVICE_TABLE(auxiliary, sfh_tm_id_table);
|
| 72 |
|
| 73 | static struct auxiliary_driver sfh_tm_driver = {
|
| 74 | .name = "tabletmode",
|
| 75 | .id_table = sfh_tm_id_table,
|
| 76 | .probe = sfh_tm_probe,
|
| 77 | };
|
| 78 | module_auxiliary_driver(sfh_tm_driver);
|
| 79 |
|
| 80 | MODULE_DESCRIPTION("AMD SFH tablet mode switch");
|
| 81 | MODULE_LICENSE("GPL");
|