1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Inspur WMI Platform Profile
4 *
5 * Copyright (C) 2018 Ai Chao <aichao@kylinos.cn>
6 */
7
8#include <linux/acpi.h>
9#include <linux/device.h>
10#include <linux/module.h>
11#include <linux/platform_profile.h>
12#include <linux/wmi.h>
13
14#define WMI_INSPUR_POWERMODE_BIOS_GUID "596C31E3-332D-43C9-AEE9-585493284F5D"
15
16enum inspur_wmi_method_ids {
17 INSPUR_WMI_GET_POWERMODE = 0x02,
18 INSPUR_WMI_SET_POWERMODE = 0x03,
19};
20
21/*
22 * Power Mode:
23 * 0x0: Balance Mode
24 * 0x1: Performance Mode
25 * 0x2: Power Saver Mode
26 */
27enum inspur_tmp_profile {
28 INSPUR_TMP_PROFILE_BALANCE = 0,
29 INSPUR_TMP_PROFILE_PERFORMANCE = 1,
30 INSPUR_TMP_PROFILE_POWERSAVE = 2,
31};
32
33struct inspur_wmi_priv {
34 struct wmi_device *wdev;
35 struct platform_profile_handler handler;
36};
37
38static int inspur_wmi_perform_query(struct wmi_device *wdev,
39 enum inspur_wmi_method_ids query_id,
40 void *buffer, size_t insize,
41 size_t outsize)
42{
43 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
44 struct acpi_buffer input = { insize, buffer};
45 union acpi_object *obj;
46 acpi_status status;
47 int ret = 0;
48
49 status = wmidev_evaluate_method(wdev, instance: 0, method_id: query_id, in: &input, out: &output);
50 if (ACPI_FAILURE(status)) {
51 dev_err(&wdev->dev, "EC Powermode control failed: %s\n",
52 acpi_format_exception(status));
53 return -EIO;
54 }
55
56 obj = output.pointer;
57 if (!obj)
58 return -EINVAL;
59
60 if (obj->type != ACPI_TYPE_BUFFER ||
61 obj->buffer.length != outsize) {
62 ret = -EINVAL;
63 goto out_free;
64 }
65
66 memcpy(buffer, obj->buffer.pointer, obj->buffer.length);
67
68out_free:
69 kfree(objp: obj);
70 return ret;
71}
72
73/*
74 * Set Power Mode to EC RAM. If Power Mode value greater than 0x3,
75 * return error
76 * Method ID: 0x3
77 * Arg: 4 Bytes
78 * Byte [0]: Power Mode:
79 * 0x0: Balance Mode
80 * 0x1: Performance Mode
81 * 0x2: Power Saver Mode
82 * Return Value: 4 Bytes
83 * Byte [0]: Return Code
84 * 0x0: No Error
85 * 0x1: Error
86 */
87static int inspur_platform_profile_set(struct platform_profile_handler *pprof,
88 enum platform_profile_option profile)
89{
90 struct inspur_wmi_priv *priv = container_of(pprof, struct inspur_wmi_priv,
91 handler);
92 u8 ret_code[4] = {0, 0, 0, 0};
93 int ret;
94
95 switch (profile) {
96 case PLATFORM_PROFILE_BALANCED:
97 ret_code[0] = INSPUR_TMP_PROFILE_BALANCE;
98 break;
99 case PLATFORM_PROFILE_PERFORMANCE:
100 ret_code[0] = INSPUR_TMP_PROFILE_PERFORMANCE;
101 break;
102 case PLATFORM_PROFILE_LOW_POWER:
103 ret_code[0] = INSPUR_TMP_PROFILE_POWERSAVE;
104 break;
105 default:
106 return -EOPNOTSUPP;
107 }
108
109 ret = inspur_wmi_perform_query(wdev: priv->wdev, query_id: INSPUR_WMI_SET_POWERMODE,
110 buffer: ret_code, insize: sizeof(ret_code),
111 outsize: sizeof(ret_code));
112
113 if (ret < 0)
114 return ret;
115
116 if (ret_code[0])
117 return -EBADRQC;
118
119 return 0;
120}
121
122/*
123 * Get Power Mode from EC RAM, If Power Mode value greater than 0x3,
124 * return error
125 * Method ID: 0x2
126 * Return Value: 4 Bytes
127 * Byte [0]: Return Code
128 * 0x0: No Error
129 * 0x1: Error
130 * Byte [1]: Power Mode
131 * 0x0: Balance Mode
132 * 0x1: Performance Mode
133 * 0x2: Power Saver Mode
134 */
135static int inspur_platform_profile_get(struct platform_profile_handler *pprof,
136 enum platform_profile_option *profile)
137{
138 struct inspur_wmi_priv *priv = container_of(pprof, struct inspur_wmi_priv,
139 handler);
140 u8 ret_code[4] = {0, 0, 0, 0};
141 int ret;
142
143 ret = inspur_wmi_perform_query(wdev: priv->wdev, query_id: INSPUR_WMI_GET_POWERMODE,
144 buffer: &ret_code, insize: sizeof(ret_code),
145 outsize: sizeof(ret_code));
146 if (ret < 0)
147 return ret;
148
149 if (ret_code[0])
150 return -EBADRQC;
151
152 switch (ret_code[1]) {
153 case INSPUR_TMP_PROFILE_BALANCE:
154 *profile = PLATFORM_PROFILE_BALANCED;
155 break;
156 case INSPUR_TMP_PROFILE_PERFORMANCE:
157 *profile = PLATFORM_PROFILE_PERFORMANCE;
158 break;
159 case INSPUR_TMP_PROFILE_POWERSAVE:
160 *profile = PLATFORM_PROFILE_LOW_POWER;
161 break;
162 default:
163 return -EINVAL;
164 }
165
166 return 0;
167}
168
169static int inspur_wmi_probe(struct wmi_device *wdev, const void *context)
170{
171 struct inspur_wmi_priv *priv;
172
173 priv = devm_kzalloc(dev: &wdev->dev, size: sizeof(*priv), GFP_KERNEL);
174 if (!priv)
175 return -ENOMEM;
176
177 priv->wdev = wdev;
178 dev_set_drvdata(dev: &wdev->dev, data: priv);
179
180 priv->handler.profile_get = inspur_platform_profile_get;
181 priv->handler.profile_set = inspur_platform_profile_set;
182
183 set_bit(nr: PLATFORM_PROFILE_LOW_POWER, addr: priv->handler.choices);
184 set_bit(nr: PLATFORM_PROFILE_BALANCED, addr: priv->handler.choices);
185 set_bit(nr: PLATFORM_PROFILE_PERFORMANCE, addr: priv->handler.choices);
186
187 return platform_profile_register(pprof: &priv->handler);
188}
189
190static void inspur_wmi_remove(struct wmi_device *wdev)
191{
192 platform_profile_remove();
193}
194
195static const struct wmi_device_id inspur_wmi_id_table[] = {
196 { .guid_string = WMI_INSPUR_POWERMODE_BIOS_GUID },
197 { }
198};
199
200MODULE_DEVICE_TABLE(wmi, inspur_wmi_id_table);
201
202static struct wmi_driver inspur_wmi_driver = {
203 .driver = {
204 .name = "inspur-wmi-platform-profile",
205 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
206 },
207 .id_table = inspur_wmi_id_table,
208 .probe = inspur_wmi_probe,
209 .remove = inspur_wmi_remove,
210};
211
212module_wmi_driver(inspur_wmi_driver);
213
214MODULE_AUTHOR("Ai Chao <aichao@kylinos.cn>");
215MODULE_DESCRIPTION("Platform Profile Support for Inspur");
216MODULE_LICENSE("GPL");
217

source code of linux/drivers/platform/x86/inspur_platform_profile.c