94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* dell-dw5826e-reset.c - Dell DW5826e reset driver
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*
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* Copyright (C) 2026 Jackbb Wu <jackbb.wu@compal.com>
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*/
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#include <linux/acpi.h>
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#include <linux/bits.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/uuid.h>
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#define PALC_DSM_FN_TRIGGER_PLDR 1
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static guid_t palc_dsm_guid =
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GUID_INIT(0x5a1a4bba, 0x8006, 0x487e, 0xbe, 0x0a, 0xac, 0xf5, 0xd8, 0xfd, 0xfe, 0x59);
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static int trigger_palc_pldr(struct device *dev, acpi_handle handle)
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{
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union acpi_object *obj;
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int ret = 0;
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obj = acpi_evaluate_dsm(handle, &palc_dsm_guid, 1, PALC_DSM_FN_TRIGGER_PLDR, NULL);
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if (!obj) {
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dev_err(dev, "Failed to evaluate _DSM\n");
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return -EIO;
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}
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if (obj->type != ACPI_TYPE_BUFFER) {
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dev_err(dev, "Unexpected _DSM return type: %d\n", obj->type);
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ret = -EINVAL;
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}
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ACPI_FREE(obj);
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return ret;
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}
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static ssize_t wwan_reset_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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acpi_handle handle = ACPI_HANDLE(dev);
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int ret;
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ret = trigger_palc_pldr(dev, handle);
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if (ret)
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return ret;
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return count;
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}
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static DEVICE_ATTR_WO(wwan_reset);
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static struct attribute *palc_attrs[] = {
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&dev_attr_wwan_reset.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(palc);
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static int palc_probe(struct platform_device *pdev)
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{
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acpi_handle handle;
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handle = ACPI_HANDLE(&pdev->dev);
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if (!handle)
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return -ENODEV;
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if (!acpi_check_dsm(handle, &palc_dsm_guid, 1, BIT(PALC_DSM_FN_TRIGGER_PLDR)))
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return -ENODEV;
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return 0;
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}
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static const struct acpi_device_id palc_acpi_ids[] = {
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{ "PALC0001", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, palc_acpi_ids);
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static struct platform_driver palc_driver = {
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.driver = {
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.name = "dell-dw5826e-reset",
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.acpi_match_table = palc_acpi_ids,
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.dev_groups = palc_groups,
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},
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.probe = palc_probe,
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};
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module_platform_driver(palc_driver);
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MODULE_DESCRIPTION("Dell DW5826e reset driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("JackBB Wu");
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