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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Surface Platform Profile / Performance Mode driver for Surface System
4 * Aggregator Module (thermal and fan subsystem).
5 *
6 * Copyright (C) 2021-2022 Maximilian Luz <[email protected]>
7 */
8
9#include <linux/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 for the platform performance profile sent to the TMP module.
18enum ssam_tmp_profile {
19 SSAM_TMP_PROFILE_NORMAL = 1,
20 SSAM_TMP_PROFILE_BATTERY_SAVER = 2,
21 SSAM_TMP_PROFILE_BETTER_PERFORMANCE = 3,
22 SSAM_TMP_PROFILE_BEST_PERFORMANCE = 4,
23};
24
25// Enum for the fan profile sent to the FAN module. This fan profile is
26// only sent to the EC if the 'has_fan' property is set. The integers are
27// not a typo, they differ from the performance profile indices.
28enum ssam_fan_profile {
29 SSAM_FAN_PROFILE_NORMAL = 2,
30 SSAM_FAN_PROFILE_BATTERY_SAVER = 1,
31 SSAM_FAN_PROFILE_BETTER_PERFORMANCE = 3,
32 SSAM_FAN_PROFILE_BEST_PERFORMANCE = 4,
33};
34
35struct ssam_tmp_profile_info {
36 __le32 profile;
37 __le16 unknown1;
38 __le16 unknown2;
39} __packed;
40
41struct ssam_platform_profile_device {
42 struct ssam_device *sdev;
43 struct device *ppdev;
44 bool has_fan;
45};
46
47SSAM_DEFINE_SYNC_REQUEST_CL_R(__ssam_tmp_profile_get, struct ssam_tmp_profile_info, {
48 .target_category = SSAM_SSH_TC_TMP,
49 .command_id = 0x02,
50});
51
52SSAM_DEFINE_SYNC_REQUEST_CL_W(__ssam_tmp_profile_set, __le32, {
53 .target_category = SSAM_SSH_TC_TMP,
54 .command_id = 0x03,
55});
56
57SSAM_DEFINE_SYNC_REQUEST_W(__ssam_fan_profile_set, u8, {
58 .target_category = SSAM_SSH_TC_FAN,
59 .target_id = SSAM_SSH_TID_SAM,
60 .command_id = 0x0e,
61 .instance_id = 0x01,
62});
63
64static int ssam_tmp_profile_get(struct ssam_device *sdev, enum ssam_tmp_profile *p)
65{
66 struct ssam_tmp_profile_info info;
67 int status;
68
69 status = ssam_retry(__ssam_tmp_profile_get, sdev, &info);
70 if (status < 0)
71 return status;
72
73 *p = le32_to_cpu(info.profile);
74 return 0;
75}
76
77static int ssam_tmp_profile_set(struct ssam_device *sdev, enum ssam_tmp_profile p)
78{
79 const __le32 profile_le = cpu_to_le32(p);
80
81 return ssam_retry(__ssam_tmp_profile_set, sdev, &profile_le);
82}
83
84static int ssam_fan_profile_set(struct ssam_device *sdev, enum ssam_fan_profile p)
85{
86 const u8 profile = p;
87
88 return ssam_retry(__ssam_fan_profile_set, sdev->ctrl, &profile);
89}
90
91static int convert_ssam_tmp_to_profile(struct ssam_device *sdev, enum ssam_tmp_profile p)
92{
93 switch (p) {
94 case SSAM_TMP_PROFILE_NORMAL:
95 return PLATFORM_PROFILE_BALANCED;
96
97 case SSAM_TMP_PROFILE_BATTERY_SAVER:
98 return PLATFORM_PROFILE_LOW_POWER;
99
100 case SSAM_TMP_PROFILE_BETTER_PERFORMANCE:
101 return PLATFORM_PROFILE_BALANCED_PERFORMANCE;
102
103 case SSAM_TMP_PROFILE_BEST_PERFORMANCE:
104 return PLATFORM_PROFILE_PERFORMANCE;
105
106 default:
107 dev_err(&sdev->dev, "invalid performance profile: %d", p);
108 return -EINVAL;
109 }
110}
111
112
113static int convert_profile_to_ssam_tmp(struct ssam_device *sdev, enum platform_profile_option p)
114{
115 switch (p) {
116 case PLATFORM_PROFILE_LOW_POWER:
117 return SSAM_TMP_PROFILE_BATTERY_SAVER;
118
119 case PLATFORM_PROFILE_BALANCED:
120 return SSAM_TMP_PROFILE_NORMAL;
121
122 case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
123 return SSAM_TMP_PROFILE_BETTER_PERFORMANCE;
124
125 case PLATFORM_PROFILE_PERFORMANCE:
126 return SSAM_TMP_PROFILE_BEST_PERFORMANCE;
127
128 default:
129 /* This should have already been caught by platform_profile_store(). */
130 WARN(true, "unsupported platform profile");
131 return -EOPNOTSUPP;
132 }
133}
134
135static int convert_profile_to_ssam_fan(struct ssam_device *sdev, enum platform_profile_option p)
136{
137 switch (p) {
138 case PLATFORM_PROFILE_LOW_POWER:
139 return SSAM_FAN_PROFILE_BATTERY_SAVER;
140
141 case PLATFORM_PROFILE_BALANCED:
142 return SSAM_FAN_PROFILE_NORMAL;
143
144 case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
145 return SSAM_FAN_PROFILE_BETTER_PERFORMANCE;
146
147 case PLATFORM_PROFILE_PERFORMANCE:
148 return SSAM_FAN_PROFILE_BEST_PERFORMANCE;
149
150 default:
151 /* This should have already been caught by platform_profile_store(). */
152 WARN(true, "unsupported platform profile");
153 return -EOPNOTSUPP;
154 }
155}
156
157static int ssam_platform_profile_get(struct device *dev,
158 enum platform_profile_option *profile)
159{
160 struct ssam_platform_profile_device *tpd;
161 enum ssam_tmp_profile tp;
162 int status;
163
164 tpd = dev_get_drvdata(dev);
165
166 status = ssam_tmp_profile_get(tpd->sdev, &tp);
167 if (status)
168 return status;
169
170 status = convert_ssam_tmp_to_profile(tpd->sdev, tp);
171 if (status < 0)
172 return status;
173
174 *profile = status;
175 return 0;
176}
177
178static int ssam_platform_profile_set(struct device *dev,
179 enum platform_profile_option profile)
180{
181 struct ssam_platform_profile_device *tpd;
182 int tp;
183
184 tpd = dev_get_drvdata(dev);
185
186 tp = convert_profile_to_ssam_tmp(tpd->sdev, profile);
187 if (tp < 0)
188 return tp;
189
190 tp = ssam_tmp_profile_set(tpd->sdev, tp);
191 if (tp < 0)
192 return tp;
193
194 if (tpd->has_fan) {
195 tp = convert_profile_to_ssam_fan(tpd->sdev, profile);
196 if (tp < 0)
197 return tp;
198 tp = ssam_fan_profile_set(tpd->sdev, tp);
199 }
200
201 return tp;
202}
203
204static int ssam_platform_profile_probe(void *drvdata, unsigned long *choices)
205{
206 set_bit(PLATFORM_PROFILE_LOW_POWER, choices);
207 set_bit(PLATFORM_PROFILE_BALANCED, choices);
208 set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, choices);
209 set_bit(PLATFORM_PROFILE_PERFORMANCE, choices);
210
211 return 0;
212}
213
214static const struct platform_profile_ops ssam_platform_profile_ops = {
215 .probe = ssam_platform_profile_probe,
216 .profile_get = ssam_platform_profile_get,
217 .profile_set = ssam_platform_profile_set,
218};
219
220static int surface_platform_profile_probe(struct ssam_device *sdev)
221{
222 struct ssam_platform_profile_device *tpd;
223
224 tpd = devm_kzalloc(&sdev->dev, sizeof(*tpd), GFP_KERNEL);
225 if (!tpd)
226 return -ENOMEM;
227
228 tpd->sdev = sdev;
229 ssam_device_set_drvdata(sdev, tpd);
230
231 tpd->has_fan = device_property_read_bool(&sdev->dev, "has_fan");
232
233 tpd->ppdev = devm_platform_profile_register(&sdev->dev, "Surface Platform Profile",
234 tpd, &ssam_platform_profile_ops);
235
236 return PTR_ERR_OR_ZERO(tpd->ppdev);
237}
238
239static const struct ssam_device_id ssam_platform_profile_match[] = {
240 { SSAM_SDEV(TMP, SAM, 0x00, 0x01) },
241 { },
242};
243MODULE_DEVICE_TABLE(ssam, ssam_platform_profile_match);
244
245static struct ssam_device_driver surface_platform_profile = {
246 .probe = surface_platform_profile_probe,
247 .match_table = ssam_platform_profile_match,
248 .driver = {
249 .name = "surface_platform_profile",
250 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
251 },
252};
253module_ssam_device_driver(surface_platform_profile);
254
255MODULE_AUTHOR("Maximilian Luz <[email protected]>");
256MODULE_DESCRIPTION("Platform Profile Support for Surface System Aggregator Module");
257MODULE_LICENSE("GPL");