drivers/platform/surface/surface_platform_profile.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Surface Platform Profile / Performance Mode driver for Surface System
   4  * Aggregator Module (thermal subsystem).
   5  *
   6  * Copyright (C) 2021 Maximilian Luz <luzmaximilian@gmail.com>
   7  */
   8
   9 #include <asm/unaligned.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_profile.h>
  13 #include <linux/types.h>
  14
  15 #include <linux/surface_aggregator/device.h>
  16
  17 enum ssam_tmp_profile {
  18         SSAM_TMP_PROFILE_NORMAL             = 1,
  19         SSAM_TMP_PROFILE_BATTERY_SAVER      = 2,
  20         SSAM_TMP_PROFILE_BETTER_PERFORMANCE = 3,
  21         SSAM_TMP_PROFILE_BEST_PERFORMANCE   = 4,
  22 };
  23
  24 struct ssam_tmp_profile_info {
  25         __le32 profile;
  26         __le16 unknown1;
  27         __le16 unknown2;
  28 } __packed;
  29
  30 struct ssam_tmp_profile_device {
  31         struct ssam_device *sdev;
  32         struct platform_profile_handler handler;
  33 };
  34
  35 SSAM_DEFINE_SYNC_REQUEST_CL_R(__ssam_tmp_profile_get, struct ssam_tmp_profile_info, {
  36         .target_category = SSAM_SSH_TC_TMP,
  37         .command_id      = 0x02,
  38 });
  39
  40 SSAM_DEFINE_SYNC_REQUEST_CL_W(__ssam_tmp_profile_set, __le32, {
  41         .target_category = SSAM_SSH_TC_TMP,
  42         .command_id      = 0x03,
  43 });
  44
  45 static int ssam_tmp_profile_get(struct ssam_device *sdev, enum ssam_tmp_profile *p)
  46 {
  47         struct ssam_tmp_profile_info info;
  48         int status;
  49
  50         status = ssam_retry(__ssam_tmp_profile_get, sdev, &info);
  51         if (status < 0)
  52                 return status;
  53
  54         *p = le32_to_cpu(info.profile);
  55         return 0;
  56 }
  57
  58 static int ssam_tmp_profile_set(struct ssam_device *sdev, enum ssam_tmp_profile p)
  59 {
  60         __le32 profile_le = cpu_to_le32(p);
  61
  62         return ssam_retry(__ssam_tmp_profile_set, sdev, &profile_le);
  63 }
  64
  65 static int convert_ssam_to_profile(struct ssam_device *sdev, enum ssam_tmp_profile p)
  66 {
  67         switch (p) {
  68         case SSAM_TMP_PROFILE_NORMAL:
  69                 return PLATFORM_PROFILE_BALANCED;
  70
  71         case SSAM_TMP_PROFILE_BATTERY_SAVER:
  72                 return PLATFORM_PROFILE_LOW_POWER;
  73
  74         case SSAM_TMP_PROFILE_BETTER_PERFORMANCE:
  75                 return PLATFORM_PROFILE_BALANCED_PERFORMANCE;
  76
  77         case SSAM_TMP_PROFILE_BEST_PERFORMANCE:
  78                 return PLATFORM_PROFILE_PERFORMANCE;
  79
  80         default:
  81                 dev_err(&sdev->dev, "invalid performance profile: %d", p);
  82                 return -EINVAL;
  83         }
  84 }
  85
  86 static int convert_profile_to_ssam(struct ssam_device *sdev, enum platform_profile_option p)
  87 {
  88         switch (p) {
  89         case PLATFORM_PROFILE_LOW_POWER:
  90                 return SSAM_TMP_PROFILE_BATTERY_SAVER;
  91
  92         case PLATFORM_PROFILE_BALANCED:
  93                 return SSAM_TMP_PROFILE_NORMAL;
  94
  95         case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
  96                 return SSAM_TMP_PROFILE_BETTER_PERFORMANCE;
  97
  98         case PLATFORM_PROFILE_PERFORMANCE:
  99                 return SSAM_TMP_PROFILE_BEST_PERFORMANCE;
 100
 101         default:
 102                 /* This should have already been caught by platform_profile_store(). */
 103                 WARN(true, "unsupported platform profile");
 104                 return -EOPNOTSUPP;
 105         }
 106 }
 107
 108 static int ssam_platform_profile_get(struct platform_profile_handler *pprof,
 109                                      enum platform_profile_option *profile)
 110 {
 111         struct ssam_tmp_profile_device *tpd;
 112         enum ssam_tmp_profile tp;
 113         int status;
 114
 115         tpd = container_of(pprof, struct ssam_tmp_profile_device, handler);
 116
 117         status = ssam_tmp_profile_get(tpd->sdev, &tp);
 118         if (status)
 119                 return status;
 120
 121         status = convert_ssam_to_profile(tpd->sdev, tp);
 122         if (status < 0)
 123                 return status;
 124
 125         *profile = status;
 126         return 0;
 127 }
 128
 129 static int ssam_platform_profile_set(struct platform_profile_handler *pprof,
 130                                      enum platform_profile_option profile)
 131 {
 132         struct ssam_tmp_profile_device *tpd;
 133         int tp;
 134
 135         tpd = container_of(pprof, struct ssam_tmp_profile_device, handler);
 136
 137         tp = convert_profile_to_ssam(tpd->sdev, profile);
 138         if (tp < 0)
 139                 return tp;
 140
 141         return ssam_tmp_profile_set(tpd->sdev, tp);
 142 }
 143
 144 static int surface_platform_profile_probe(struct ssam_device *sdev)
 145 {
 146         struct ssam_tmp_profile_device *tpd;
 147
 148         tpd = devm_kzalloc(&sdev->dev, sizeof(*tpd), GFP_KERNEL);
 149         if (!tpd)
 150                 return -ENOMEM;
 151
 152         tpd->sdev = sdev;
 153
 154         tpd->handler.profile_get = ssam_platform_profile_get;
 155         tpd->handler.profile_set = ssam_platform_profile_set;
 156
 157         set_bit(PLATFORM_PROFILE_LOW_POWER, tpd->handler.choices);
 158         set_bit(PLATFORM_PROFILE_BALANCED, tpd->handler.choices);
 159         set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, tpd->handler.choices);
 160         set_bit(PLATFORM_PROFILE_PERFORMANCE, tpd->handler.choices);
 161
 162         platform_profile_register(&tpd->handler);
 163         return 0;
 164 }
 165
 166 static void surface_platform_profile_remove(struct ssam_device *sdev)
 167 {
 168         platform_profile_remove();
 169 }
 170
 171 static const struct ssam_device_id ssam_platform_profile_match[] = {
 172         { SSAM_SDEV(TMP, 0x01, 0x00, 0x01) },
 173         { },
 174 };
 175 MODULE_DEVICE_TABLE(ssam, ssam_platform_profile_match);
 176
 177 static struct ssam_device_driver surface_platform_profile = {
 178         .probe = surface_platform_profile_probe,
 179         .remove = surface_platform_profile_remove,
 180         .match_table = ssam_platform_profile_match,
 181         .driver = {
 182                 .name = "surface_platform_profile",
 183                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 184         },
 185 };
 186 module_ssam_device_driver(surface_platform_profile);
 187
 188 MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
 189 MODULE_DESCRIPTION("Platform Profile Support for Surface System Aggregator Module");
 190 MODULE_LICENSE("GPL");