// SPDX-License-Identifier: GPL-2.0
/*
* UCSI ACPI driver
*
* Copyright (C) 2017, Intel Corporation
* Author: Heikki Krogerus <[email protected]>
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/dmi.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;
void *base;
bool check_bogus_event;
guid_t guid;
u64 cmd;
};
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_read_version(struct ucsi *ucsi, u16 *version)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;
ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
if (ret)
return ret;
memcpy(version, ua->base + UCSI_VERSION, sizeof(*version));
return 0;
}
static int ucsi_acpi_read_cci(struct ucsi *ucsi, u32 *cci)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;
ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
if (ret)
return ret;
memcpy(cci, ua->base + UCSI_CCI, sizeof(*cci));
return 0;
}
static int ucsi_acpi_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;
ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
if (ret)
return ret;
memcpy(val, ua->base + UCSI_MESSAGE_IN, val_len);
return 0;
}
static int ucsi_acpi_async_control(struct ucsi *ucsi, u64 command)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
memcpy(ua->base + UCSI_CONTROL, &command, sizeof(command));
ua->cmd = command;
return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_WRITE);
}
static const struct ucsi_operations ucsi_acpi_ops = {
.read_version = ucsi_acpi_read_version,
.read_cci = ucsi_acpi_read_cci,
.read_message_in = ucsi_acpi_read_message_in,
.sync_control = ucsi_sync_control_common,
.async_control = ucsi_acpi_async_control
};
static int
ucsi_zenbook_read_cci(struct ucsi *ucsi, u32 *cci)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;
if (UCSI_COMMAND(ua->cmd) == UCSI_PPM_RESET) {
ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
if (ret)
return ret;
}
memcpy(cci, ua->base + UCSI_CCI, sizeof(*cci));
return 0;
}
static int
ucsi_zenbook_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
/* UCSI_MESSAGE_IN is never read for PPM_RESET, return stored data */
memcpy(val, ua->base + UCSI_MESSAGE_IN, val_len);
return 0;
}
static const struct ucsi_operations ucsi_zenbook_ops = {
.read_version = ucsi_acpi_read_version,
.read_cci = ucsi_zenbook_read_cci,
.read_message_in = ucsi_zenbook_read_message_in,
.sync_control = ucsi_sync_control_common,
.async_control = ucsi_acpi_async_control
};
static int ucsi_gram_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
{
u16 bogus_change = UCSI_CONSTAT_POWER_LEVEL_CHANGE |
UCSI_CONSTAT_PDOS_CHANGE;
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
struct ucsi_connector_status *status;
int ret;
ret = ucsi_acpi_read_message_in(ucsi, val, val_len);
if (ret < 0)
return ret;
if (UCSI_COMMAND(ua->cmd) == UCSI_GET_CONNECTOR_STATUS &&
ua->check_bogus_event) {
status = (struct ucsi_connector_status *)val;
/* Clear the bogus change */
if (status->change == bogus_change)
status->change = 0;
ua->check_bogus_event = false;
}
return ret;
}
static int ucsi_gram_sync_control(struct ucsi *ucsi, u64 command)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;
ret = ucsi_sync_control_common(ucsi, command);
if (ret < 0)
return ret;
if (UCSI_COMMAND(ua->cmd) == UCSI_GET_PDOS &&
ua->cmd & UCSI_GET_PDOS_PARTNER_PDO(1) &&
ua->cmd & UCSI_GET_PDOS_SRC_PDOS)
ua->check_bogus_event = true;
return ret;
}
static const struct ucsi_operations ucsi_gram_ops = {
.read_version = ucsi_acpi_read_version,
.read_cci = ucsi_acpi_read_cci,
.read_message_in = ucsi_gram_read_message_in,
.sync_control = ucsi_gram_sync_control,
.async_control = ucsi_acpi_async_control
};
static const struct dmi_system_id ucsi_acpi_quirks[] = {
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UA_UM325UA"),
},
.driver_data = (void *)&ucsi_zenbook_ops,
},
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LG Electronics"),
DMI_MATCH(DMI_PRODUCT_FAMILY, "LG gram PC"),
DMI_MATCH(DMI_PRODUCT_NAME, "90Q"),
},
.driver_data = (void *)&ucsi_gram_ops,
},
{ }
};
static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
{
struct ucsi_acpi *ua = data;
u32 cci;
int ret;
ret = ua->ucsi->ops->read_cci(ua->ucsi, &cci);
if (ret)
return;
ucsi_notify_common(ua->ucsi, cci);
}
static int ucsi_acpi_probe(struct platform_device *pdev)
{
struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
const struct ucsi_operations *ops = &ucsi_acpi_ops;
const struct dmi_system_id *id;
struct ucsi_acpi *ua;
struct resource *res;
acpi_status status;
int ret;
if (adev->dep_unmet)
return -EPROBE_DEFER;
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;
}
ua->base = devm_memremap(&pdev->dev, res->start, resource_size(res), MEMREMAP_WB);
if (IS_ERR(ua->base))
return PTR_ERR(ua->base);
ret = guid_parse(UCSI_DSM_UUID, &ua->guid);
if (ret)
return ret;
ua->dev = &pdev->dev;
id = dmi_first_match(ucsi_acpi_quirks);
if (id)
ops = id->driver_data;
ua->ucsi = ucsi_create(&pdev->dev, ops);
if (IS_ERR(ua->ucsi))
return PTR_ERR(ua->ucsi);
ucsi_set_drvdata(ua->ucsi, ua);
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");
ucsi_destroy(ua->ucsi);
return -ENODEV;
}
ret = ucsi_register(ua->ucsi);
if (ret) {
acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
ACPI_DEVICE_NOTIFY,
ucsi_acpi_notify);
ucsi_destroy(ua->ucsi);
return ret;
}
platform_set_drvdata(pdev, ua);
return 0;
}
static void ucsi_acpi_remove(struct platform_device *pdev)
{
struct ucsi_acpi *ua = platform_get_drvdata(pdev);
ucsi_unregister(ua->ucsi);
ucsi_destroy(ua->ucsi);
acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), ACPI_DEVICE_NOTIFY,
ucsi_acpi_notify);
}
static int ucsi_acpi_resume(struct device *dev)
{
struct ucsi_acpi *ua = dev_get_drvdata(dev);
return ucsi_resume(ua->ucsi);
}
static DEFINE_SIMPLE_DEV_PM_OPS(ucsi_acpi_pm_ops, NULL, ucsi_acpi_resume);
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",
.pm = pm_ptr(&ucsi_acpi_pm_ops),
.acpi_match_table = ACPI_PTR(ucsi_acpi_match),
},
.probe = ucsi_acpi_probe,
.remove_new = ucsi_acpi_remove,
};
module_platform_driver(ucsi_acpi_platform_driver);
MODULE_AUTHOR("Heikki Krogerus <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("UCSI ACPI driver");
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