// SPDX-License-Identifier: GPL-2.0
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/*
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* UCSI ACPI driver
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*
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* Copyright (C) 2017, Intel Corporation
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* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include "ucsi.h"
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#define UCSI_DSM_UUID "6f8398c2-7ca4-11e4-ad36-631042b5008f"
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#define UCSI_DSM_FUNC_WRITE 1
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#define UCSI_DSM_FUNC_READ 2
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struct ucsi_acpi {
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struct device *dev;
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struct ucsi *ucsi;
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struct ucsi_ppm ppm;
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guid_t guid;
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};
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static int ucsi_acpi_dsm(struct ucsi_acpi *ua, int func)
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{
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union acpi_object *obj;
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obj = acpi_evaluate_dsm(ACPI_HANDLE(ua->dev), &ua->guid, 1, func,
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NULL);
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if (!obj) {
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dev_err(ua->dev, "%s: failed to evaluate _DSM %d\n",
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__func__, func);
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return -EIO;
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}
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ACPI_FREE(obj);
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return 0;
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}
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static int ucsi_acpi_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl)
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{
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struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm);
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ppm->data->ctrl.raw_cmd = ctrl->raw_cmd;
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return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_WRITE);
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}
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static int ucsi_acpi_sync(struct ucsi_ppm *ppm)
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{
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struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm);
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return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
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}
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static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
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{
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struct ucsi_acpi *ua = data;
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ucsi_notify(ua->ucsi);
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}
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static int ucsi_acpi_probe(struct platform_device *pdev)
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{
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struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
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struct ucsi_acpi *ua;
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struct resource *res;
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acpi_status status;
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int ret;
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if (adev->dep_unmet)
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return -EPROBE_DEFER;
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ua = devm_kzalloc(&pdev->dev, sizeof(*ua), GFP_KERNEL);
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if (!ua)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "missing memory resource\n");
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return -ENODEV;
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}
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/* This will make sure we can use ioremap_nocache() */
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status = acpi_release_memory(ACPI_HANDLE(&pdev->dev), res, 1);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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/*
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* NOTE: The memory region for the data structures is used also in an
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* operation region, which means ACPI has already reserved it. Therefore
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* it can not be requested here, and we can not use
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* devm_ioremap_resource().
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*/
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ua->ppm.data = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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if (!ua->ppm.data)
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return -ENOMEM;
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if (!ua->ppm.data->version)
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return -ENODEV;
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ret = guid_parse(UCSI_DSM_UUID, &ua->guid);
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if (ret)
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return ret;
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ua->ppm.cmd = ucsi_acpi_cmd;
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ua->ppm.sync = ucsi_acpi_sync;
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ua->dev = &pdev->dev;
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status = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
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ACPI_DEVICE_NOTIFY,
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ucsi_acpi_notify, ua);
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if (ACPI_FAILURE(status)) {
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dev_err(&pdev->dev, "failed to install notify handler\n");
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return -ENODEV;
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}
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ua->ucsi = ucsi_register_ppm(&pdev->dev, &ua->ppm);
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if (IS_ERR(ua->ucsi)) {
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acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
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ACPI_DEVICE_NOTIFY,
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ucsi_acpi_notify);
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return PTR_ERR(ua->ucsi);
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}
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platform_set_drvdata(pdev, ua);
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return 0;
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}
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static int ucsi_acpi_remove(struct platform_device *pdev)
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{
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struct ucsi_acpi *ua = platform_get_drvdata(pdev);
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ucsi_unregister_ppm(ua->ucsi);
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acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), ACPI_DEVICE_NOTIFY,
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ucsi_acpi_notify);
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return 0;
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}
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static const struct acpi_device_id ucsi_acpi_match[] = {
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{ "PNP0CA0", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, ucsi_acpi_match);
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static struct platform_driver ucsi_acpi_platform_driver = {
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.driver = {
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.name = "ucsi_acpi",
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.acpi_match_table = ACPI_PTR(ucsi_acpi_match),
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},
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.probe = ucsi_acpi_probe,
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.remove = ucsi_acpi_remove,
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};
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module_platform_driver(ucsi_acpi_platform_driver);
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MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("UCSI ACPI driver");
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