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