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/* 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 = kcalloc(*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 = kcalloc(*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
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