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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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64ee252826
Follow the advice of the Documentation/filesystems/sysfs.rst and show() should only use sysfs_emit() or sysfs_emit_at() when formatting the value to be returned to user space. Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* fan_attr.c - Create extra attributes for ACPI Fan driver
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2022 Intel Corporation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include "fan.h"
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MODULE_LICENSE("GPL");
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static ssize_t show_state(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct acpi_fan_fps *fps = container_of(attr, struct acpi_fan_fps, dev_attr);
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int count;
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if (fps->control == 0xFFFFFFFF || fps->control > 100)
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count = scnprintf(buf, PAGE_SIZE, "not-defined:");
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else
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count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
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if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
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count += sysfs_emit_at(buf, count, "not-defined:");
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else
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count += sysfs_emit_at(buf, count, "%lld:", fps->trip_point);
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if (fps->speed == 0xFFFFFFFF)
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count += sysfs_emit_at(buf, count, "not-defined:");
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else
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count += sysfs_emit_at(buf, count, "%lld:", fps->speed);
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if (fps->noise_level == 0xFFFFFFFF)
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count += sysfs_emit_at(buf, count, "not-defined:");
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else
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count += sysfs_emit_at(buf, count, "%lld:", fps->noise_level * 100);
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if (fps->power == 0xFFFFFFFF)
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count += sysfs_emit_at(buf, count, "not-defined\n");
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else
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count += sysfs_emit_at(buf, count, "%lld\n", fps->power);
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return count;
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}
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static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct acpi_device *acpi_dev = container_of(dev, struct acpi_device, dev);
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struct acpi_fan_fst fst;
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int status;
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status = acpi_fan_get_fst(acpi_dev, &fst);
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if (status)
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return status;
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return sprintf(buf, "%lld\n", fst.speed);
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}
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static ssize_t show_fine_grain_control(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct acpi_device *acpi_dev = container_of(dev, struct acpi_device, dev);
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struct acpi_fan *fan = acpi_driver_data(acpi_dev);
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return sprintf(buf, "%d\n", fan->fif.fine_grain_ctrl);
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}
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int acpi_fan_create_attributes(struct acpi_device *device)
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{
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struct acpi_fan *fan = acpi_driver_data(device);
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int i, status;
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sysfs_attr_init(&fan->fine_grain_control.attr);
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fan->fine_grain_control.show = show_fine_grain_control;
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fan->fine_grain_control.store = NULL;
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fan->fine_grain_control.attr.name = "fine_grain_control";
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fan->fine_grain_control.attr.mode = 0444;
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status = sysfs_create_file(&device->dev.kobj, &fan->fine_grain_control.attr);
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if (status)
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return status;
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/* _FST is present if we are here */
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sysfs_attr_init(&fan->fst_speed.attr);
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fan->fst_speed.show = show_fan_speed;
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fan->fst_speed.store = NULL;
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fan->fst_speed.attr.name = "fan_speed_rpm";
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fan->fst_speed.attr.mode = 0444;
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status = sysfs_create_file(&device->dev.kobj, &fan->fst_speed.attr);
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if (status)
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goto rem_fine_grain_attr;
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for (i = 0; i < fan->fps_count; ++i) {
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struct acpi_fan_fps *fps = &fan->fps[i];
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snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
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sysfs_attr_init(&fps->dev_attr.attr);
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fps->dev_attr.show = show_state;
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fps->dev_attr.store = NULL;
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fps->dev_attr.attr.name = fps->name;
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fps->dev_attr.attr.mode = 0444;
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status = sysfs_create_file(&device->dev.kobj, &fps->dev_attr.attr);
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if (status) {
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int j;
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for (j = 0; j < i; ++j)
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sysfs_remove_file(&device->dev.kobj, &fan->fps[j].dev_attr.attr);
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goto rem_fst_attr;
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}
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}
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return 0;
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rem_fst_attr:
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sysfs_remove_file(&device->dev.kobj, &fan->fst_speed.attr);
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rem_fine_grain_attr:
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sysfs_remove_file(&device->dev.kobj, &fan->fine_grain_control.attr);
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return status;
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}
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void acpi_fan_delete_attributes(struct acpi_device *device)
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{
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struct acpi_fan *fan = acpi_driver_data(device);
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int i;
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for (i = 0; i < fan->fps_count; ++i)
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sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
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sysfs_remove_file(&device->dev.kobj, &fan->fst_speed.attr);
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sysfs_remove_file(&device->dev.kobj, &fan->fine_grain_control.attr);
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}
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