1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * fan_attr.c - Create extra attributes for ACPI Fan driver
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2022 Intel Corporation. All rights reserved.
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/acpi.h>
14
15#include "fan.h"
16
17MODULE_LICENSE("GPL");
18
19static ssize_t show_state(struct device *dev, struct device_attribute *attr, char *buf)
20{
21 struct acpi_fan_fps *fps = container_of(attr, struct acpi_fan_fps, dev_attr);
22 int count;
23
24 if (fps->control == 0xFFFFFFFF || fps->control > 100)
25 count = sysfs_emit(buf, fmt: "not-defined:");
26 else
27 count = sysfs_emit(buf, fmt: "%lld:", fps->control);
28
29 if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
30 count += sysfs_emit_at(buf, at: count, fmt: "not-defined:");
31 else
32 count += sysfs_emit_at(buf, at: count, fmt: "%lld:", fps->trip_point);
33
34 if (fps->speed == 0xFFFFFFFF)
35 count += sysfs_emit_at(buf, at: count, fmt: "not-defined:");
36 else
37 count += sysfs_emit_at(buf, at: count, fmt: "%lld:", fps->speed);
38
39 if (fps->noise_level == 0xFFFFFFFF)
40 count += sysfs_emit_at(buf, at: count, fmt: "not-defined:");
41 else
42 count += sysfs_emit_at(buf, at: count, fmt: "%lld:", fps->noise_level * 100);
43
44 if (fps->power == 0xFFFFFFFF)
45 count += sysfs_emit_at(buf, at: count, fmt: "not-defined\n");
46 else
47 count += sysfs_emit_at(buf, at: count, fmt: "%lld\n", fps->power);
48
49 return count;
50}
51
52static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf)
53{
54 struct acpi_device *acpi_dev = container_of(dev, struct acpi_device, dev);
55 struct acpi_fan_fst fst;
56 int status;
57
58 status = acpi_fan_get_fst(device: acpi_dev, fst: &fst);
59 if (status)
60 return status;
61
62 return sysfs_emit(buf, fmt: "%lld\n", fst.speed);
63}
64
65static ssize_t show_fine_grain_control(struct device *dev, struct device_attribute *attr, char *buf)
66{
67 struct acpi_device *acpi_dev = container_of(dev, struct acpi_device, dev);
68 struct acpi_fan *fan = acpi_driver_data(d: acpi_dev);
69
70 return sysfs_emit(buf, fmt: "%d\n", fan->fif.fine_grain_ctrl);
71}
72
73int acpi_fan_create_attributes(struct acpi_device *device)
74{
75 struct acpi_fan *fan = acpi_driver_data(d: device);
76 int i, status;
77
78 /* _FST is present if we are here */
79 sysfs_attr_init(&fan->fst_speed.attr);
80 fan->fst_speed.show = show_fan_speed;
81 fan->fst_speed.store = NULL;
82 fan->fst_speed.attr.name = "fan_speed_rpm";
83 fan->fst_speed.attr.mode = 0444;
84 status = sysfs_create_file(kobj: &device->dev.kobj, attr: &fan->fst_speed.attr);
85 if (status)
86 return status;
87
88 if (!fan->acpi4)
89 return 0;
90
91 sysfs_attr_init(&fan->fine_grain_control.attr);
92 fan->fine_grain_control.show = show_fine_grain_control;
93 fan->fine_grain_control.store = NULL;
94 fan->fine_grain_control.attr.name = "fine_grain_control";
95 fan->fine_grain_control.attr.mode = 0444;
96 status = sysfs_create_file(kobj: &device->dev.kobj, attr: &fan->fine_grain_control.attr);
97 if (status)
98 goto rem_fst_attr;
99
100 for (i = 0; i < fan->fps_count; ++i) {
101 struct acpi_fan_fps *fps = &fan->fps[i];
102
103 snprintf(buf: fps->name, ACPI_FPS_NAME_LEN, fmt: "state%d", i);
104 sysfs_attr_init(&fps->dev_attr.attr);
105 fps->dev_attr.show = show_state;
106 fps->dev_attr.store = NULL;
107 fps->dev_attr.attr.name = fps->name;
108 fps->dev_attr.attr.mode = 0444;
109 status = sysfs_create_file(kobj: &device->dev.kobj, attr: &fps->dev_attr.attr);
110 if (status) {
111 int j;
112
113 for (j = 0; j < i; ++j)
114 sysfs_remove_file(kobj: &device->dev.kobj, attr: &fan->fps[j].dev_attr.attr);
115 goto rem_fine_grain_attr;
116 }
117 }
118
119 return 0;
120
121rem_fine_grain_attr:
122 sysfs_remove_file(kobj: &device->dev.kobj, attr: &fan->fine_grain_control.attr);
123
124rem_fst_attr:
125 sysfs_remove_file(kobj: &device->dev.kobj, attr: &fan->fst_speed.attr);
126
127 return status;
128}
129
130void acpi_fan_delete_attributes(struct acpi_device *device)
131{
132 struct acpi_fan *fan = acpi_driver_data(d: device);
133 int i;
134
135 sysfs_remove_file(kobj: &device->dev.kobj, attr: &fan->fst_speed.attr);
136
137 if (!fan->acpi4)
138 return;
139
140 for (i = 0; i < fan->fps_count; ++i)
141 sysfs_remove_file(kobj: &device->dev.kobj, attr: &fan->fps[i].dev_attr.attr);
142
143 sysfs_remove_file(kobj: &device->dev.kobj, attr: &fan->fine_grain_control.attr);
144}
145