linux/drivers/thermal/int340x_thermal/acpi_thermal_rel.c
Sumeet Pawnikar 1820142f56 Thermal/int340x: Fix few typos and kernel warn message
This patch fix the few typos in trt structure. Also, update
kernel warn message for failed to get device name from acpi
handle.

Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
2017-08-08 21:36:34 +08:00

395 lines
10 KiB
C

/* acpi_thermal_rel.c driver for exporting ACPI thermal relationship
*
* Copyright (c) 2014 Intel Corp
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
*/
/*
* Two functionalities included:
* 1. Export _TRT, _ART, via misc device interface to the userspace.
* 2. Provide parsing result to kernel drivers
*
*/
#include <linux/init.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/acpi.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include "acpi_thermal_rel.h"
static acpi_handle acpi_thermal_rel_handle;
static DEFINE_SPINLOCK(acpi_thermal_rel_chrdev_lock);
static int acpi_thermal_rel_chrdev_count; /* #times opened */
static int acpi_thermal_rel_chrdev_exclu; /* already open exclusive? */
static int acpi_thermal_rel_open(struct inode *inode, struct file *file)
{
spin_lock(&acpi_thermal_rel_chrdev_lock);
if (acpi_thermal_rel_chrdev_exclu ||
(acpi_thermal_rel_chrdev_count && (file->f_flags & O_EXCL))) {
spin_unlock(&acpi_thermal_rel_chrdev_lock);
return -EBUSY;
}
if (file->f_flags & O_EXCL)
acpi_thermal_rel_chrdev_exclu = 1;
acpi_thermal_rel_chrdev_count++;
spin_unlock(&acpi_thermal_rel_chrdev_lock);
return nonseekable_open(inode, file);
}
static int acpi_thermal_rel_release(struct inode *inode, struct file *file)
{
spin_lock(&acpi_thermal_rel_chrdev_lock);
acpi_thermal_rel_chrdev_count--;
acpi_thermal_rel_chrdev_exclu = 0;
spin_unlock(&acpi_thermal_rel_chrdev_lock);
return 0;
}
/**
* acpi_parse_trt - Thermal Relationship Table _TRT for passive cooling
*
* @handle: ACPI handle of the device contains _TRT
* @trt_count: the number of valid entries resulted from parsing _TRT
* @trtp: pointer to pointer of array of _TRT entries in parsing result
* @create_dev: whether to create platform devices for target and source
*
*/
int acpi_parse_trt(acpi_handle handle, int *trt_count, struct trt **trtp,
bool create_dev)
{
acpi_status status;
int result = 0;
int i;
int nr_bad_entries = 0;
struct trt *trts;
struct acpi_device *adev;
union acpi_object *p;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer element = { 0, NULL };
struct acpi_buffer trt_format = { sizeof("RRNNNNNN"), "RRNNNNNN" };
if (!acpi_has_method(handle, "_TRT"))
return -ENODEV;
status = acpi_evaluate_object(handle, "_TRT", NULL, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buffer.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
pr_err("Invalid _TRT data\n");
result = -EFAULT;
goto end;
}
*trt_count = p->package.count;
trts = kzalloc(*trt_count * sizeof(struct trt), GFP_KERNEL);
if (!trts) {
result = -ENOMEM;
goto end;
}
for (i = 0; i < *trt_count; i++) {
struct trt *trt = &trts[i - nr_bad_entries];
element.length = sizeof(struct trt);
element.pointer = trt;
status = acpi_extract_package(&(p->package.elements[i]),
&trt_format, &element);
if (ACPI_FAILURE(status)) {
nr_bad_entries++;
pr_warn("_TRT package %d is invalid, ignored\n", i);
continue;
}
if (!create_dev)
continue;
result = acpi_bus_get_device(trt->source, &adev);
if (result)
pr_warn("Failed to get source ACPI device\n");
result = acpi_bus_get_device(trt->target, &adev);
if (result)
pr_warn("Failed to get target ACPI device\n");
}
result = 0;
*trtp = trts;
/* don't count bad entries */
*trt_count -= nr_bad_entries;
end:
kfree(buffer.pointer);
return result;
}
EXPORT_SYMBOL(acpi_parse_trt);
/**
* acpi_parse_art - Parse Active Relationship Table _ART
*
* @handle: ACPI handle of the device contains _ART
* @art_count: the number of valid entries resulted from parsing _ART
* @artp: pointer to pointer of array of art entries in parsing result
* @create_dev: whether to create platform devices for target and source
*
*/
int acpi_parse_art(acpi_handle handle, int *art_count, struct art **artp,
bool create_dev)
{
acpi_status status;
int result = 0;
int i;
int nr_bad_entries = 0;
struct art *arts;
struct acpi_device *adev;
union acpi_object *p;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer element = { 0, NULL };
struct acpi_buffer art_format = {
sizeof("RRNNNNNNNNNNN"), "RRNNNNNNNNNNN" };
if (!acpi_has_method(handle, "_ART"))
return -ENODEV;
status = acpi_evaluate_object(handle, "_ART", NULL, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buffer.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
pr_err("Invalid _ART data\n");
result = -EFAULT;
goto end;
}
/* ignore p->package.elements[0], as this is _ART Revision field */
*art_count = p->package.count - 1;
arts = kzalloc(*art_count * sizeof(struct art), GFP_KERNEL);
if (!arts) {
result = -ENOMEM;
goto end;
}
for (i = 0; i < *art_count; i++) {
struct art *art = &arts[i - nr_bad_entries];
element.length = sizeof(struct art);
element.pointer = art;
status = acpi_extract_package(&(p->package.elements[i + 1]),
&art_format, &element);
if (ACPI_FAILURE(status)) {
pr_warn("_ART package %d is invalid, ignored", i);
nr_bad_entries++;
continue;
}
if (!create_dev)
continue;
if (art->source) {
result = acpi_bus_get_device(art->source, &adev);
if (result)
pr_warn("Failed to get source ACPI device\n");
}
if (art->target) {
result = acpi_bus_get_device(art->target, &adev);
if (result)
pr_warn("Failed to get target ACPI device\n");
}
}
*artp = arts;
/* don't count bad entries */
*art_count -= nr_bad_entries;
end:
kfree(buffer.pointer);
return result;
}
EXPORT_SYMBOL(acpi_parse_art);
/* get device name from acpi handle */
static void get_single_name(acpi_handle handle, char *name)
{
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer)))
pr_warn("Failed to get device name from acpi handle\n");
else {
memcpy(name, buffer.pointer, ACPI_NAME_SIZE);
kfree(buffer.pointer);
}
}
static int fill_art(char __user *ubuf)
{
int i;
int ret;
int count;
int art_len;
struct art *arts = NULL;
union art_object *art_user;
ret = acpi_parse_art(acpi_thermal_rel_handle, &count, &arts, false);
if (ret)
goto free_art;
art_len = count * sizeof(union art_object);
art_user = kzalloc(art_len, GFP_KERNEL);
if (!art_user) {
ret = -ENOMEM;
goto free_art;
}
/* now fill in user art data */
for (i = 0; i < count; i++) {
/* userspace art needs device name instead of acpi reference */
get_single_name(arts[i].source, art_user[i].source_device);
get_single_name(arts[i].target, art_user[i].target_device);
/* copy the rest int data in addition to source and target */
memcpy(&art_user[i].weight, &arts[i].weight,
sizeof(u64) * (ACPI_NR_ART_ELEMENTS - 2));
}
if (copy_to_user(ubuf, art_user, art_len))
ret = -EFAULT;
kfree(art_user);
free_art:
kfree(arts);
return ret;
}
static int fill_trt(char __user *ubuf)
{
int i;
int ret;
int count;
int trt_len;
struct trt *trts = NULL;
union trt_object *trt_user;
ret = acpi_parse_trt(acpi_thermal_rel_handle, &count, &trts, false);
if (ret)
goto free_trt;
trt_len = count * sizeof(union trt_object);
trt_user = kzalloc(trt_len, GFP_KERNEL);
if (!trt_user) {
ret = -ENOMEM;
goto free_trt;
}
/* now fill in user trt data */
for (i = 0; i < count; i++) {
/* userspace trt needs device name instead of acpi reference */
get_single_name(trts[i].source, trt_user[i].source_device);
get_single_name(trts[i].target, trt_user[i].target_device);
trt_user[i].sample_period = trts[i].sample_period;
trt_user[i].influence = trts[i].influence;
}
if (copy_to_user(ubuf, trt_user, trt_len))
ret = -EFAULT;
kfree(trt_user);
free_trt:
kfree(trts);
return ret;
}
static long acpi_thermal_rel_ioctl(struct file *f, unsigned int cmd,
unsigned long __arg)
{
int ret = 0;
unsigned long length = 0;
int count = 0;
char __user *arg = (void __user *)__arg;
struct trt *trts = NULL;
struct art *arts = NULL;
switch (cmd) {
case ACPI_THERMAL_GET_TRT_COUNT:
ret = acpi_parse_trt(acpi_thermal_rel_handle, &count,
&trts, false);
kfree(trts);
if (!ret)
return put_user(count, (unsigned long __user *)__arg);
return ret;
case ACPI_THERMAL_GET_TRT_LEN:
ret = acpi_parse_trt(acpi_thermal_rel_handle, &count,
&trts, false);
kfree(trts);
length = count * sizeof(union trt_object);
if (!ret)
return put_user(length, (unsigned long __user *)__arg);
return ret;
case ACPI_THERMAL_GET_TRT:
return fill_trt(arg);
case ACPI_THERMAL_GET_ART_COUNT:
ret = acpi_parse_art(acpi_thermal_rel_handle, &count,
&arts, false);
kfree(arts);
if (!ret)
return put_user(count, (unsigned long __user *)__arg);
return ret;
case ACPI_THERMAL_GET_ART_LEN:
ret = acpi_parse_art(acpi_thermal_rel_handle, &count,
&arts, false);
kfree(arts);
length = count * sizeof(union art_object);
if (!ret)
return put_user(length, (unsigned long __user *)__arg);
return ret;
case ACPI_THERMAL_GET_ART:
return fill_art(arg);
default:
return -ENOTTY;
}
}
static const struct file_operations acpi_thermal_rel_fops = {
.owner = THIS_MODULE,
.open = acpi_thermal_rel_open,
.release = acpi_thermal_rel_release,
.unlocked_ioctl = acpi_thermal_rel_ioctl,
.llseek = no_llseek,
};
static struct miscdevice acpi_thermal_rel_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
"acpi_thermal_rel",
&acpi_thermal_rel_fops
};
int acpi_thermal_rel_misc_device_add(acpi_handle handle)
{
acpi_thermal_rel_handle = handle;
return misc_register(&acpi_thermal_rel_misc_device);
}
EXPORT_SYMBOL(acpi_thermal_rel_misc_device_add);
int acpi_thermal_rel_misc_device_remove(acpi_handle handle)
{
misc_deregister(&acpi_thermal_rel_misc_device);
return 0;
}
EXPORT_SYMBOL(acpi_thermal_rel_misc_device_remove);
MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com");
MODULE_DESCRIPTION("Intel acpi thermal rel misc dev driver");
MODULE_LICENSE("GPL v2");