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