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// SPDX-License-Identifier: GPL-2.0+
/*
* Surface Platform Profile / Performance Mode driver for Surface System
* Aggregator Module (thermal subsystem).
*
* Copyright (C) 2021 Maximilian Luz <luzmaximilian@gmail.com>
*/
#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_profile.h>
#include <linux/types.h>
#include <linux/surface_aggregator/device.h>
enum ssam_tmp_profile {
SSAM_TMP_PROFILE_NORMAL = 1,
SSAM_TMP_PROFILE_BATTERY_SAVER = 2,
SSAM_TMP_PROFILE_BETTER_PERFORMANCE = 3,
SSAM_TMP_PROFILE_BEST_PERFORMANCE = 4,
};
struct ssam_tmp_profile_info {
__le32 profile;
__le16 unknown1;
__le16 unknown2;
} __packed;
struct ssam_tmp_profile_device {
struct ssam_device *sdev;
struct platform_profile_handler handler;
};
SSAM_DEFINE_SYNC_REQUEST_CL_R(__ssam_tmp_profile_get, struct ssam_tmp_profile_info, {
.target_category = SSAM_SSH_TC_TMP,
.command_id = 0x02,
});
SSAM_DEFINE_SYNC_REQUEST_CL_W(__ssam_tmp_profile_set, __le32, {
.target_category = SSAM_SSH_TC_TMP,
.command_id = 0x03,
});
static int ssam_tmp_profile_get(struct ssam_device *sdev, enum ssam_tmp_profile *p)
{
struct ssam_tmp_profile_info info;
int status;
status = ssam_retry(__ssam_tmp_profile_get, sdev, &info);
if (status < 0)
return status;
*p = le32_to_cpu(info.profile);
return 0;
}
static int ssam_tmp_profile_set(struct ssam_device *sdev, enum ssam_tmp_profile p)
{
__le32 profile_le = cpu_to_le32(p);
return ssam_retry(__ssam_tmp_profile_set, sdev, &profile_le);
}
static int convert_ssam_to_profile(struct ssam_device *sdev, enum ssam_tmp_profile p)
{
switch (p) {
case SSAM_TMP_PROFILE_NORMAL:
return PLATFORM_PROFILE_BALANCED;
case SSAM_TMP_PROFILE_BATTERY_SAVER:
return PLATFORM_PROFILE_LOW_POWER;
case SSAM_TMP_PROFILE_BETTER_PERFORMANCE:
return PLATFORM_PROFILE_BALANCED_PERFORMANCE;
case SSAM_TMP_PROFILE_BEST_PERFORMANCE:
return PLATFORM_PROFILE_PERFORMANCE;
default:
dev_err(&sdev->dev, "invalid performance profile: %d", p);
return -EINVAL;
}
}
static int convert_profile_to_ssam(struct ssam_device *sdev, enum platform_profile_option p)
{
switch (p) {
case PLATFORM_PROFILE_LOW_POWER:
return SSAM_TMP_PROFILE_BATTERY_SAVER;
case PLATFORM_PROFILE_BALANCED:
return SSAM_TMP_PROFILE_NORMAL;
case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
return SSAM_TMP_PROFILE_BETTER_PERFORMANCE;
case PLATFORM_PROFILE_PERFORMANCE:
return SSAM_TMP_PROFILE_BEST_PERFORMANCE;
default:
/* This should have already been caught by platform_profile_store(). */
WARN(true, "unsupported platform profile");
return -EOPNOTSUPP;
}
}
static int ssam_platform_profile_get(struct platform_profile_handler *pprof,
enum platform_profile_option *profile)
{
struct ssam_tmp_profile_device *tpd;
enum ssam_tmp_profile tp;
int status;
tpd = container_of(pprof, struct ssam_tmp_profile_device, handler);
status = ssam_tmp_profile_get(tpd->sdev, &tp);
if (status)
return status;
status = convert_ssam_to_profile(tpd->sdev, tp);
if (status < 0)
return status;
*profile = status;
return 0;
}
static int ssam_platform_profile_set(struct platform_profile_handler *pprof,
enum platform_profile_option profile)
{
struct ssam_tmp_profile_device *tpd;
int tp;
tpd = container_of(pprof, struct ssam_tmp_profile_device, handler);
tp = convert_profile_to_ssam(tpd->sdev, profile);
if (tp < 0)
return tp;
return ssam_tmp_profile_set(tpd->sdev, tp);
}
static int surface_platform_profile_probe(struct ssam_device *sdev)
{
struct ssam_tmp_profile_device *tpd;
tpd = devm_kzalloc(&sdev->dev, sizeof(*tpd), GFP_KERNEL);
if (!tpd)
return -ENOMEM;
tpd->sdev = sdev;
tpd->handler.profile_get = ssam_platform_profile_get;
tpd->handler.profile_set = ssam_platform_profile_set;
set_bit(PLATFORM_PROFILE_LOW_POWER, tpd->handler.choices);
set_bit(PLATFORM_PROFILE_BALANCED, tpd->handler.choices);
set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, tpd->handler.choices);
set_bit(PLATFORM_PROFILE_PERFORMANCE, tpd->handler.choices);
platform_profile_register(&tpd->handler);
return 0;
}
static void surface_platform_profile_remove(struct ssam_device *sdev)
{
platform_profile_remove();
}
static const struct ssam_device_id ssam_platform_profile_match[] = {
{ SSAM_SDEV(TMP, 0x01, 0x00, 0x01) },
{ },
};
MODULE_DEVICE_TABLE(ssam, ssam_platform_profile_match);
static struct ssam_device_driver surface_platform_profile = {
.probe = surface_platform_profile_probe,
.remove = surface_platform_profile_remove,
.match_table = ssam_platform_profile_match,
.driver = {
.name = "surface_platform_profile",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
module_ssam_device_driver(surface_platform_profile);
MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
MODULE_DESCRIPTION("Platform Profile Support for Surface System Aggregator Module");
MODULE_LICENSE("GPL");
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