191 lines
4.8 KiB
C
191 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Surface Platform Profile / Performance Mode driver for Surface System
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* Aggregator Module (thermal subsystem).
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*
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* Copyright (C) 2021-2022 Maximilian Luz <luzmaximilian@gmail.com>
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*/
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#include <asm/unaligned.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_profile.h>
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#include <linux/types.h>
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#include <linux/surface_aggregator/device.h>
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enum ssam_tmp_profile {
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SSAM_TMP_PROFILE_NORMAL = 1,
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SSAM_TMP_PROFILE_BATTERY_SAVER = 2,
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SSAM_TMP_PROFILE_BETTER_PERFORMANCE = 3,
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SSAM_TMP_PROFILE_BEST_PERFORMANCE = 4,
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};
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struct ssam_tmp_profile_info {
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__le32 profile;
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__le16 unknown1;
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__le16 unknown2;
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} __packed;
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struct ssam_tmp_profile_device {
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struct ssam_device *sdev;
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struct platform_profile_handler handler;
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};
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SSAM_DEFINE_SYNC_REQUEST_CL_R(__ssam_tmp_profile_get, struct ssam_tmp_profile_info, {
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.target_category = SSAM_SSH_TC_TMP,
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.command_id = 0x02,
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});
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SSAM_DEFINE_SYNC_REQUEST_CL_W(__ssam_tmp_profile_set, __le32, {
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.target_category = SSAM_SSH_TC_TMP,
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.command_id = 0x03,
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});
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static int ssam_tmp_profile_get(struct ssam_device *sdev, enum ssam_tmp_profile *p)
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{
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struct ssam_tmp_profile_info info;
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int status;
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status = ssam_retry(__ssam_tmp_profile_get, sdev, &info);
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if (status < 0)
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return status;
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*p = le32_to_cpu(info.profile);
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return 0;
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}
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static int ssam_tmp_profile_set(struct ssam_device *sdev, enum ssam_tmp_profile p)
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{
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__le32 profile_le = cpu_to_le32(p);
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return ssam_retry(__ssam_tmp_profile_set, sdev, &profile_le);
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}
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static int convert_ssam_to_profile(struct ssam_device *sdev, enum ssam_tmp_profile p)
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{
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switch (p) {
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case SSAM_TMP_PROFILE_NORMAL:
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return PLATFORM_PROFILE_BALANCED;
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case SSAM_TMP_PROFILE_BATTERY_SAVER:
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return PLATFORM_PROFILE_LOW_POWER;
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case SSAM_TMP_PROFILE_BETTER_PERFORMANCE:
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return PLATFORM_PROFILE_BALANCED_PERFORMANCE;
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case SSAM_TMP_PROFILE_BEST_PERFORMANCE:
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return PLATFORM_PROFILE_PERFORMANCE;
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default:
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dev_err(&sdev->dev, "invalid performance profile: %d", p);
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return -EINVAL;
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}
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}
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static int convert_profile_to_ssam(struct ssam_device *sdev, enum platform_profile_option p)
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{
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switch (p) {
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case PLATFORM_PROFILE_LOW_POWER:
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return SSAM_TMP_PROFILE_BATTERY_SAVER;
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case PLATFORM_PROFILE_BALANCED:
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return SSAM_TMP_PROFILE_NORMAL;
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case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
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return SSAM_TMP_PROFILE_BETTER_PERFORMANCE;
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case PLATFORM_PROFILE_PERFORMANCE:
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return SSAM_TMP_PROFILE_BEST_PERFORMANCE;
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default:
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/* This should have already been caught by platform_profile_store(). */
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WARN(true, "unsupported platform profile");
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return -EOPNOTSUPP;
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}
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}
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static int ssam_platform_profile_get(struct platform_profile_handler *pprof,
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enum platform_profile_option *profile)
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{
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struct ssam_tmp_profile_device *tpd;
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enum ssam_tmp_profile tp;
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int status;
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tpd = container_of(pprof, struct ssam_tmp_profile_device, handler);
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status = ssam_tmp_profile_get(tpd->sdev, &tp);
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if (status)
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return status;
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status = convert_ssam_to_profile(tpd->sdev, tp);
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if (status < 0)
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return status;
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*profile = status;
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return 0;
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}
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static int ssam_platform_profile_set(struct platform_profile_handler *pprof,
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enum platform_profile_option profile)
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{
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struct ssam_tmp_profile_device *tpd;
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int tp;
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tpd = container_of(pprof, struct ssam_tmp_profile_device, handler);
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tp = convert_profile_to_ssam(tpd->sdev, profile);
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if (tp < 0)
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return tp;
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return ssam_tmp_profile_set(tpd->sdev, tp);
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}
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static int surface_platform_profile_probe(struct ssam_device *sdev)
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{
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struct ssam_tmp_profile_device *tpd;
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tpd = devm_kzalloc(&sdev->dev, sizeof(*tpd), GFP_KERNEL);
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if (!tpd)
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return -ENOMEM;
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tpd->sdev = sdev;
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tpd->handler.profile_get = ssam_platform_profile_get;
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tpd->handler.profile_set = ssam_platform_profile_set;
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set_bit(PLATFORM_PROFILE_LOW_POWER, tpd->handler.choices);
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set_bit(PLATFORM_PROFILE_BALANCED, tpd->handler.choices);
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set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, tpd->handler.choices);
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set_bit(PLATFORM_PROFILE_PERFORMANCE, tpd->handler.choices);
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platform_profile_register(&tpd->handler);
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return 0;
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}
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static void surface_platform_profile_remove(struct ssam_device *sdev)
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{
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platform_profile_remove();
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}
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static const struct ssam_device_id ssam_platform_profile_match[] = {
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{ SSAM_SDEV(TMP, 0x01, 0x00, 0x01) },
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{ },
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};
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MODULE_DEVICE_TABLE(ssam, ssam_platform_profile_match);
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static struct ssam_device_driver surface_platform_profile = {
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.probe = surface_platform_profile_probe,
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.remove = surface_platform_profile_remove,
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.match_table = ssam_platform_profile_match,
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.driver = {
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.name = "surface_platform_profile",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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};
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module_ssam_device_driver(surface_platform_profile);
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MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
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MODULE_DESCRIPTION("Platform Profile Support for Surface System Aggregator Module");
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MODULE_LICENSE("GPL");
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