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
17 MODULE_LICENSE("GPL");
18
show_state(struct device * dev,struct device_attribute * attr,char * buf)19 static 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 = scnprintf(buf, PAGE_SIZE, "not-defined:");
26 else
27 count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
28
29 if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
30 count += sysfs_emit_at(buf, count, "not-defined:");
31 else
32 count += sysfs_emit_at(buf, count, "%lld:", fps->trip_point);
33
34 if (fps->speed == 0xFFFFFFFF)
35 count += sysfs_emit_at(buf, count, "not-defined:");
36 else
37 count += sysfs_emit_at(buf, count, "%lld:", fps->speed);
38
39 if (fps->noise_level == 0xFFFFFFFF)
40 count += sysfs_emit_at(buf, count, "not-defined:");
41 else
42 count += sysfs_emit_at(buf, count, "%lld:", fps->noise_level * 100);
43
44 if (fps->power == 0xFFFFFFFF)
45 count += sysfs_emit_at(buf, count, "not-defined\n");
46 else
47 count += sysfs_emit_at(buf, count, "%lld\n", fps->power);
48
49 return count;
50 }
51
show_fan_speed(struct device * dev,struct device_attribute * attr,char * buf)52 static 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(acpi_dev, &fst);
59 if (status)
60 return status;
61
62 return sprintf(buf, "%lld\n", fst.speed);
63 }
64
show_fine_grain_control(struct device * dev,struct device_attribute * attr,char * buf)65 static 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(acpi_dev);
69
70 return sprintf(buf, "%d\n", fan->fif.fine_grain_ctrl);
71 }
72
acpi_fan_create_attributes(struct acpi_device * device)73 int acpi_fan_create_attributes(struct acpi_device *device)
74 {
75 struct acpi_fan *fan = acpi_driver_data(device);
76 int i, status;
77
78 sysfs_attr_init(&fan->fine_grain_control.attr);
79 fan->fine_grain_control.show = show_fine_grain_control;
80 fan->fine_grain_control.store = NULL;
81 fan->fine_grain_control.attr.name = "fine_grain_control";
82 fan->fine_grain_control.attr.mode = 0444;
83 status = sysfs_create_file(&device->dev.kobj, &fan->fine_grain_control.attr);
84 if (status)
85 return status;
86
87 /* _FST is present if we are here */
88 sysfs_attr_init(&fan->fst_speed.attr);
89 fan->fst_speed.show = show_fan_speed;
90 fan->fst_speed.store = NULL;
91 fan->fst_speed.attr.name = "fan_speed_rpm";
92 fan->fst_speed.attr.mode = 0444;
93 status = sysfs_create_file(&device->dev.kobj, &fan->fst_speed.attr);
94 if (status)
95 goto rem_fine_grain_attr;
96
97 for (i = 0; i < fan->fps_count; ++i) {
98 struct acpi_fan_fps *fps = &fan->fps[i];
99
100 snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
101 sysfs_attr_init(&fps->dev_attr.attr);
102 fps->dev_attr.show = show_state;
103 fps->dev_attr.store = NULL;
104 fps->dev_attr.attr.name = fps->name;
105 fps->dev_attr.attr.mode = 0444;
106 status = sysfs_create_file(&device->dev.kobj, &fps->dev_attr.attr);
107 if (status) {
108 int j;
109
110 for (j = 0; j < i; ++j)
111 sysfs_remove_file(&device->dev.kobj, &fan->fps[j].dev_attr.attr);
112 goto rem_fst_attr;
113 }
114 }
115
116 return 0;
117
118 rem_fst_attr:
119 sysfs_remove_file(&device->dev.kobj, &fan->fst_speed.attr);
120
121 rem_fine_grain_attr:
122 sysfs_remove_file(&device->dev.kobj, &fan->fine_grain_control.attr);
123
124 return status;
125 }
126
acpi_fan_delete_attributes(struct acpi_device * device)127 void acpi_fan_delete_attributes(struct acpi_device *device)
128 {
129 struct acpi_fan *fan = acpi_driver_data(device);
130 int i;
131
132 for (i = 0; i < fan->fps_count; ++i)
133 sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
134
135 sysfs_remove_file(&device->dev.kobj, &fan->fst_speed.attr);
136 sysfs_remove_file(&device->dev.kobj, &fan->fine_grain_control.attr);
137 }
138