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a2ff95e0 MP |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | ||
3 | /* Platform profile sysfs interface */ | |
4 | ||
5 | #include <linux/acpi.h> | |
6 | #include <linux/bits.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/platform_profile.h> | |
10 | #include <linux/sysfs.h> | |
11 | ||
9d56653d | 12 | static struct platform_profile_handler *cur_profile; |
a2ff95e0 MP |
13 | static DEFINE_MUTEX(profile_lock); |
14 | ||
15 | static const char * const profile_names[] = { | |
16 | [PLATFORM_PROFILE_LOW_POWER] = "low-power", | |
17 | [PLATFORM_PROFILE_COOL] = "cool", | |
18 | [PLATFORM_PROFILE_QUIET] = "quiet", | |
19 | [PLATFORM_PROFILE_BALANCED] = "balanced", | |
6c0b5e3f | 20 | [PLATFORM_PROFILE_BALANCED_PERFORMANCE] = "balanced-performance", |
a2ff95e0 MP |
21 | [PLATFORM_PROFILE_PERFORMANCE] = "performance", |
22 | }; | |
23 | static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST); | |
24 | ||
25 | static ssize_t platform_profile_choices_show(struct device *dev, | |
26 | struct device_attribute *attr, | |
27 | char *buf) | |
28 | { | |
29 | int len = 0; | |
30 | int err, i; | |
31 | ||
32 | err = mutex_lock_interruptible(&profile_lock); | |
33 | if (err) | |
34 | return err; | |
35 | ||
36 | if (!cur_profile) { | |
37 | mutex_unlock(&profile_lock); | |
38 | return -ENODEV; | |
39 | } | |
40 | ||
41 | for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) { | |
42 | if (len == 0) | |
43 | len += sysfs_emit_at(buf, len, "%s", profile_names[i]); | |
44 | else | |
45 | len += sysfs_emit_at(buf, len, " %s", profile_names[i]); | |
46 | } | |
47 | len += sysfs_emit_at(buf, len, "\n"); | |
48 | mutex_unlock(&profile_lock); | |
49 | return len; | |
50 | } | |
51 | ||
52 | static ssize_t platform_profile_show(struct device *dev, | |
53 | struct device_attribute *attr, | |
54 | char *buf) | |
55 | { | |
56 | enum platform_profile_option profile = PLATFORM_PROFILE_BALANCED; | |
57 | int err; | |
58 | ||
59 | err = mutex_lock_interruptible(&profile_lock); | |
60 | if (err) | |
61 | return err; | |
62 | ||
63 | if (!cur_profile) { | |
64 | mutex_unlock(&profile_lock); | |
65 | return -ENODEV; | |
66 | } | |
67 | ||
84f9017c | 68 | err = cur_profile->profile_get(cur_profile, &profile); |
a2ff95e0 MP |
69 | mutex_unlock(&profile_lock); |
70 | if (err) | |
71 | return err; | |
72 | ||
73 | /* Check that profile is valid index */ | |
74 | if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names)))) | |
75 | return -EIO; | |
76 | ||
77 | return sysfs_emit(buf, "%s\n", profile_names[profile]); | |
78 | } | |
79 | ||
80 | static ssize_t platform_profile_store(struct device *dev, | |
81 | struct device_attribute *attr, | |
82 | const char *buf, size_t count) | |
83 | { | |
84 | int err, i; | |
85 | ||
86 | err = mutex_lock_interruptible(&profile_lock); | |
87 | if (err) | |
88 | return err; | |
89 | ||
90 | if (!cur_profile) { | |
91 | mutex_unlock(&profile_lock); | |
92 | return -ENODEV; | |
93 | } | |
94 | ||
95 | /* Scan for a matching profile */ | |
96 | i = sysfs_match_string(profile_names, buf); | |
97 | if (i < 0) { | |
98 | mutex_unlock(&profile_lock); | |
99 | return -EINVAL; | |
100 | } | |
101 | ||
102 | /* Check that platform supports this profile choice */ | |
103 | if (!test_bit(i, cur_profile->choices)) { | |
104 | mutex_unlock(&profile_lock); | |
105 | return -EOPNOTSUPP; | |
106 | } | |
107 | ||
84f9017c | 108 | err = cur_profile->profile_set(cur_profile, i); |
b25d5a1c HG |
109 | if (!err) |
110 | sysfs_notify(acpi_kobj, NULL, "platform_profile"); | |
111 | ||
a2ff95e0 MP |
112 | mutex_unlock(&profile_lock); |
113 | if (err) | |
114 | return err; | |
115 | return count; | |
116 | } | |
117 | ||
118 | static DEVICE_ATTR_RO(platform_profile_choices); | |
119 | static DEVICE_ATTR_RW(platform_profile); | |
120 | ||
121 | static struct attribute *platform_profile_attrs[] = { | |
122 | &dev_attr_platform_profile_choices.attr, | |
123 | &dev_attr_platform_profile.attr, | |
124 | NULL | |
125 | }; | |
126 | ||
127 | static const struct attribute_group platform_profile_group = { | |
128 | .attrs = platform_profile_attrs | |
129 | }; | |
130 | ||
131 | void platform_profile_notify(void) | |
132 | { | |
133 | if (!cur_profile) | |
134 | return; | |
135 | sysfs_notify(acpi_kobj, NULL, "platform_profile"); | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(platform_profile_notify); | |
138 | ||
9d56653d | 139 | int platform_profile_register(struct platform_profile_handler *pprof) |
a2ff95e0 MP |
140 | { |
141 | int err; | |
142 | ||
143 | mutex_lock(&profile_lock); | |
144 | /* We can only have one active profile */ | |
145 | if (cur_profile) { | |
146 | mutex_unlock(&profile_lock); | |
147 | return -EEXIST; | |
148 | } | |
149 | ||
150 | /* Sanity check the profile handler field are set */ | |
151 | if (!pprof || bitmap_empty(pprof->choices, PLATFORM_PROFILE_LAST) || | |
152 | !pprof->profile_set || !pprof->profile_get) { | |
153 | mutex_unlock(&profile_lock); | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | err = sysfs_create_group(acpi_kobj, &platform_profile_group); | |
158 | if (err) { | |
159 | mutex_unlock(&profile_lock); | |
160 | return err; | |
161 | } | |
162 | ||
163 | cur_profile = pprof; | |
164 | mutex_unlock(&profile_lock); | |
165 | return 0; | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(platform_profile_register); | |
168 | ||
169 | int platform_profile_remove(void) | |
170 | { | |
a2ff95e0 | 171 | sysfs_remove_group(acpi_kobj, &platform_profile_group); |
041142d7 HG |
172 | |
173 | mutex_lock(&profile_lock); | |
a2ff95e0 MP |
174 | cur_profile = NULL; |
175 | mutex_unlock(&profile_lock); | |
176 | return 0; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(platform_profile_remove); | |
179 | ||
180 | MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>"); | |
181 | MODULE_LICENSE("GPL"); |