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) 2021-2022 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, SAM, 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");
191