drivers/acpi/fan_attr.c

   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
  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
  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
  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
  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
 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 }