linux/drivers/hwmon/acpi_power_meter.c
Wang Shenran 6e4d91aa07 hwmon: (acpi_power_meter) Change log level for 'unsafe software power cap'
At boot time, the acpi_power_meter driver logs the following error level
message: "Ignoring unsafe software power cap". Having read about it from
a few sources, it seems that the error message can be quite misleading.

While the message can imply that Linux is ignoring the fact that the
system is operating in potentially dangerous conditions, the truth is
the driver found an ACPI_PMC object that supports software power
capping. The driver simply decides not to use it, perhaps because it
doesn't support the object.

The best solution is probably changing the log level from error to warning.
All sources I have found, regarding the error, have downplayed its
significance. There is not much of a reason for it to be on error level,
while causing potential confusions or misinterpretations.

Signed-off-by: Wang Shenran <shenran268@gmail.com>
Link: https://lore.kernel.org/r/20190724080110.6952-1-shenran268@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2019-09-03 12:47:17 -07:00

1004 lines
23 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* A hwmon driver for ACPI 4.0 power meters
* Copyright (C) 2009 IBM
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#include <linux/module.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/err.h>
#include <linux/acpi.h>
#define ACPI_POWER_METER_NAME "power_meter"
ACPI_MODULE_NAME(ACPI_POWER_METER_NAME);
#define ACPI_POWER_METER_DEVICE_NAME "Power Meter"
#define ACPI_POWER_METER_CLASS "pwr_meter_resource"
#define NUM_SENSORS 17
#define POWER_METER_CAN_MEASURE (1 << 0)
#define POWER_METER_CAN_TRIP (1 << 1)
#define POWER_METER_CAN_CAP (1 << 2)
#define POWER_METER_CAN_NOTIFY (1 << 3)
#define POWER_METER_IS_BATTERY (1 << 8)
#define UNKNOWN_HYSTERESIS 0xFFFFFFFF
#define METER_NOTIFY_CONFIG 0x80
#define METER_NOTIFY_TRIP 0x81
#define METER_NOTIFY_CAP 0x82
#define METER_NOTIFY_CAPPING 0x83
#define METER_NOTIFY_INTERVAL 0x84
#define POWER_AVERAGE_NAME "power1_average"
#define POWER_CAP_NAME "power1_cap"
#define POWER_AVG_INTERVAL_NAME "power1_average_interval"
#define POWER_ALARM_NAME "power1_alarm"
static int cap_in_hardware;
static bool force_cap_on;
static int can_cap_in_hardware(void)
{
return force_cap_on || cap_in_hardware;
}
static const struct acpi_device_id power_meter_ids[] = {
{"ACPI000D", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, power_meter_ids);
struct acpi_power_meter_capabilities {
u64 flags;
u64 units;
u64 type;
u64 accuracy;
u64 sampling_time;
u64 min_avg_interval;
u64 max_avg_interval;
u64 hysteresis;
u64 configurable_cap;
u64 min_cap;
u64 max_cap;
};
struct acpi_power_meter_resource {
struct acpi_device *acpi_dev;
acpi_bus_id name;
struct mutex lock;
struct device *hwmon_dev;
struct acpi_power_meter_capabilities caps;
acpi_string model_number;
acpi_string serial_number;
acpi_string oem_info;
u64 power;
u64 cap;
u64 avg_interval;
int sensors_valid;
unsigned long sensors_last_updated;
struct sensor_device_attribute sensors[NUM_SENSORS];
int num_sensors;
s64 trip[2];
int num_domain_devices;
struct acpi_device **domain_devices;
struct kobject *holders_dir;
};
struct sensor_template {
char *label;
ssize_t (*show)(struct device *dev,
struct device_attribute *devattr,
char *buf);
ssize_t (*set)(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count);
int index;
};
/* Averaging interval */
static int update_avg_interval(struct acpi_power_meter_resource *resource)
{
unsigned long long data;
acpi_status status;
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
NULL, &data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI"));
return -ENODEV;
}
resource->avg_interval = data;
return 0;
}
static ssize_t show_avg_interval(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
mutex_lock(&resource->lock);
update_avg_interval(resource);
mutex_unlock(&resource->lock);
return sprintf(buf, "%llu\n", resource->avg_interval);
}
static ssize_t set_avg_interval(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
int res;
unsigned long temp;
unsigned long long data;
acpi_status status;
res = kstrtoul(buf, 10, &temp);
if (res)
return res;
if (temp > resource->caps.max_avg_interval ||
temp < resource->caps.min_avg_interval)
return -EINVAL;
arg0.integer.value = temp;
mutex_lock(&resource->lock);
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
&args, &data);
if (!ACPI_FAILURE(status))
resource->avg_interval = temp;
mutex_unlock(&resource->lock);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
return -EINVAL;
}
/* _PAI returns 0 on success, nonzero otherwise */
if (data)
return -EINVAL;
return count;
}
/* Cap functions */
static int update_cap(struct acpi_power_meter_resource *resource)
{
unsigned long long data;
acpi_status status;
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
NULL, &data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL"));
return -ENODEV;
}
resource->cap = data;
return 0;
}
static ssize_t show_cap(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
mutex_lock(&resource->lock);
update_cap(resource);
mutex_unlock(&resource->lock);
return sprintf(buf, "%llu\n", resource->cap * 1000);
}
static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
int res;
unsigned long temp;
unsigned long long data;
acpi_status status;
res = kstrtoul(buf, 10, &temp);
if (res)
return res;
temp = DIV_ROUND_CLOSEST(temp, 1000);
if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
return -EINVAL;
arg0.integer.value = temp;
mutex_lock(&resource->lock);
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
&args, &data);
if (!ACPI_FAILURE(status))
resource->cap = temp;
mutex_unlock(&resource->lock);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
return -EINVAL;
}
/* _SHL returns 0 on success, nonzero otherwise */
if (data)
return -EINVAL;
return count;
}
/* Power meter trip points */
static int set_acpi_trip(struct acpi_power_meter_resource *resource)
{
union acpi_object arg_objs[] = {
{ACPI_TYPE_INTEGER},
{ACPI_TYPE_INTEGER}
};
struct acpi_object_list args = { 2, arg_objs };
unsigned long long data;
acpi_status status;
/* Both trip levels must be set */
if (resource->trip[0] < 0 || resource->trip[1] < 0)
return 0;
/* This driver stores min, max; ACPI wants max, min. */
arg_objs[0].integer.value = resource->trip[1];
arg_objs[1].integer.value = resource->trip[0];
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
&args, &data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP"));
return -EINVAL;
}
/* _PTP returns 0 on success, nonzero otherwise */
if (data)
return -EINVAL;
return 0;
}
static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
int res;
unsigned long temp;
res = kstrtoul(buf, 10, &temp);
if (res)
return res;
temp = DIV_ROUND_CLOSEST(temp, 1000);
mutex_lock(&resource->lock);
resource->trip[attr->index - 7] = temp;
res = set_acpi_trip(resource);
mutex_unlock(&resource->lock);
if (res)
return res;
return count;
}
/* Power meter */
static int update_meter(struct acpi_power_meter_resource *resource)
{
unsigned long long data;
acpi_status status;
unsigned long local_jiffies = jiffies;
if (time_before(local_jiffies, resource->sensors_last_updated +
msecs_to_jiffies(resource->caps.sampling_time)) &&
resource->sensors_valid)
return 0;
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
NULL, &data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
return -ENODEV;
}
resource->power = data;
resource->sensors_valid = 1;
resource->sensors_last_updated = jiffies;
return 0;
}
static ssize_t show_power(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
mutex_lock(&resource->lock);
update_meter(resource);
mutex_unlock(&resource->lock);
return sprintf(buf, "%llu\n", resource->power * 1000);
}
/* Miscellaneous */
static ssize_t show_str(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
acpi_string val;
switch (attr->index) {
case 0:
val = resource->model_number;
break;
case 1:
val = resource->serial_number;
break;
case 2:
val = resource->oem_info;
break;
default:
WARN(1, "Implementation error: unexpected attribute index %d\n",
attr->index);
val = "";
break;
}
return sprintf(buf, "%s\n", val);
}
static ssize_t show_val(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
u64 val = 0;
switch (attr->index) {
case 0:
val = resource->caps.min_avg_interval;
break;
case 1:
val = resource->caps.max_avg_interval;
break;
case 2:
val = resource->caps.min_cap * 1000;
break;
case 3:
val = resource->caps.max_cap * 1000;
break;
case 4:
if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
return sprintf(buf, "unknown\n");
val = resource->caps.hysteresis * 1000;
break;
case 5:
if (resource->caps.flags & POWER_METER_IS_BATTERY)
val = 1;
else
val = 0;
break;
case 6:
if (resource->power > resource->cap)
val = 1;
else
val = 0;
break;
case 7:
case 8:
if (resource->trip[attr->index - 7] < 0)
return sprintf(buf, "unknown\n");
val = resource->trip[attr->index - 7] * 1000;
break;
default:
WARN(1, "Implementation error: unexpected attribute index %d\n",
attr->index);
break;
}
return sprintf(buf, "%llu\n", val);
}
static ssize_t show_accuracy(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
unsigned int acc = resource->caps.accuracy;
return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
}
static ssize_t show_name(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
}
#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
{ \
.label = _label, \
.show = _show, \
.index = _index, \
}
#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
{ \
.label = _label, \
.show = _show, \
.set = _set, \
.index = _index, \
}
/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
static struct sensor_template meter_attrs[] = {
RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
set_avg_interval, 0),
{},
};
static struct sensor_template misc_cap_attrs[] = {
RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
{},
};
static struct sensor_template ro_cap_attrs[] = {
RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
{},
};
static struct sensor_template rw_cap_attrs[] = {
RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
{},
};
static struct sensor_template trip_attrs[] = {
RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
{},
};
static struct sensor_template misc_attrs[] = {
RO_SENSOR_TEMPLATE("name", show_name, 0),
RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
{},
};
#undef RO_SENSOR_TEMPLATE
#undef RW_SENSOR_TEMPLATE
/* Read power domain data */
static void remove_domain_devices(struct acpi_power_meter_resource *resource)
{
int i;
if (!resource->num_domain_devices)
return;
for (i = 0; i < resource->num_domain_devices; i++) {
struct acpi_device *obj = resource->domain_devices[i];
if (!obj)
continue;
sysfs_remove_link(resource->holders_dir,
kobject_name(&obj->dev.kobj));
put_device(&obj->dev);
}
kfree(resource->domain_devices);
kobject_put(resource->holders_dir);
resource->num_domain_devices = 0;
}
static int read_domain_devices(struct acpi_power_meter_resource *resource)
{
int res = 0;
int i;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *pss;
acpi_status status;
status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
&buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
return -ENODEV;
}
pss = buffer.pointer;
if (!pss ||
pss->type != ACPI_TYPE_PACKAGE) {
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
"Invalid _PMD data\n");
res = -EFAULT;
goto end;
}
if (!pss->package.count)
goto end;
resource->domain_devices = kcalloc(pss->package.count,
sizeof(struct acpi_device *),
GFP_KERNEL);
if (!resource->domain_devices) {
res = -ENOMEM;
goto end;
}
resource->holders_dir = kobject_create_and_add("measures",
&resource->acpi_dev->dev.kobj);
if (!resource->holders_dir) {
res = -ENOMEM;
goto exit_free;
}
resource->num_domain_devices = pss->package.count;
for (i = 0; i < pss->package.count; i++) {
struct acpi_device *obj;
union acpi_object *element = &(pss->package.elements[i]);
/* Refuse non-references */
if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
continue;
/* Create a symlink to domain objects */
resource->domain_devices[i] = NULL;
if (acpi_bus_get_device(element->reference.handle,
&resource->domain_devices[i]))
continue;
obj = resource->domain_devices[i];
get_device(&obj->dev);
res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
kobject_name(&obj->dev.kobj));
if (res) {
put_device(&obj->dev);
resource->domain_devices[i] = NULL;
}
}
res = 0;
goto end;
exit_free:
kfree(resource->domain_devices);
end:
kfree(buffer.pointer);
return res;
}
/* Registration and deregistration */
static int register_attrs(struct acpi_power_meter_resource *resource,
struct sensor_template *attrs)
{
struct device *dev = &resource->acpi_dev->dev;
struct sensor_device_attribute *sensors =
&resource->sensors[resource->num_sensors];
int res = 0;
while (attrs->label) {
sensors->dev_attr.attr.name = attrs->label;
sensors->dev_attr.attr.mode = 0444;
sensors->dev_attr.show = attrs->show;
sensors->index = attrs->index;
if (attrs->set) {
sensors->dev_attr.attr.mode |= 0200;
sensors->dev_attr.store = attrs->set;
}
sysfs_attr_init(&sensors->dev_attr.attr);
res = device_create_file(dev, &sensors->dev_attr);
if (res) {
sensors->dev_attr.attr.name = NULL;
goto error;
}
sensors++;
resource->num_sensors++;
attrs++;
}
error:
return res;
}
static void remove_attrs(struct acpi_power_meter_resource *resource)
{
int i;
for (i = 0; i < resource->num_sensors; i++) {
if (!resource->sensors[i].dev_attr.attr.name)
continue;
device_remove_file(&resource->acpi_dev->dev,
&resource->sensors[i].dev_attr);
}
remove_domain_devices(resource);
resource->num_sensors = 0;
}
static int setup_attrs(struct acpi_power_meter_resource *resource)
{
int res = 0;
res = read_domain_devices(resource);
if (res)
return res;
if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
res = register_attrs(resource, meter_attrs);
if (res)
goto error;
}
if (resource->caps.flags & POWER_METER_CAN_CAP) {
if (!can_cap_in_hardware()) {
dev_warn(&resource->acpi_dev->dev,
"Ignoring unsafe software power cap!\n");
goto skip_unsafe_cap;
}
if (resource->caps.configurable_cap)
res = register_attrs(resource, rw_cap_attrs);
else
res = register_attrs(resource, ro_cap_attrs);
if (res)
goto error;
res = register_attrs(resource, misc_cap_attrs);
if (res)
goto error;
}
skip_unsafe_cap:
if (resource->caps.flags & POWER_METER_CAN_TRIP) {
res = register_attrs(resource, trip_attrs);
if (res)
goto error;
}
res = register_attrs(resource, misc_attrs);
if (res)
goto error;
return res;
error:
remove_attrs(resource);
return res;
}
static void free_capabilities(struct acpi_power_meter_resource *resource)
{
acpi_string *str;
int i;
str = &resource->model_number;
for (i = 0; i < 3; i++, str++)
kfree(*str);
}
static int read_capabilities(struct acpi_power_meter_resource *resource)
{
int res = 0;
int i;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer state = { 0, NULL };
struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
union acpi_object *pss;
acpi_string *str;
acpi_status status;
status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
&buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
return -ENODEV;
}
pss = buffer.pointer;
if (!pss ||
pss->type != ACPI_TYPE_PACKAGE ||
pss->package.count != 14) {
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
"Invalid _PMC data\n");
res = -EFAULT;
goto end;
}
/* Grab all the integer data at once */
state.length = sizeof(struct acpi_power_meter_capabilities);
state.pointer = &resource->caps;
status = acpi_extract_package(pss, &format, &state);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
res = -EFAULT;
goto end;
}
if (resource->caps.units) {
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
"Unknown units %llu.\n",
resource->caps.units);
res = -EINVAL;
goto end;
}
/* Grab the string data */
str = &resource->model_number;
for (i = 11; i < 14; i++) {
union acpi_object *element = &(pss->package.elements[i]);
if (element->type != ACPI_TYPE_STRING) {
res = -EINVAL;
goto error;
}
*str = kcalloc(element->string.length + 1, sizeof(u8),
GFP_KERNEL);
if (!*str) {
res = -ENOMEM;
goto error;
}
strncpy(*str, element->string.pointer, element->string.length);
str++;
}
dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
goto end;
error:
str = &resource->model_number;
for (i = 0; i < 3; i++, str++)
kfree(*str);
end:
kfree(buffer.pointer);
return res;
}
/* Handle ACPI event notifications */
static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
{
struct acpi_power_meter_resource *resource;
int res;
if (!device || !acpi_driver_data(device))
return;
resource = acpi_driver_data(device);
mutex_lock(&resource->lock);
switch (event) {
case METER_NOTIFY_CONFIG:
free_capabilities(resource);
res = read_capabilities(resource);
if (res)
break;
remove_attrs(resource);
setup_attrs(resource);
break;
case METER_NOTIFY_TRIP:
sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
update_meter(resource);
break;
case METER_NOTIFY_CAP:
sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
update_cap(resource);
break;
case METER_NOTIFY_INTERVAL:
sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
update_avg_interval(resource);
break;
case METER_NOTIFY_CAPPING:
sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
dev_info(&device->dev, "Capping in progress.\n");
break;
default:
WARN(1, "Unexpected event %d\n", event);
break;
}
mutex_unlock(&resource->lock);
acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
dev_name(&device->dev), event, 0);
}
static int acpi_power_meter_add(struct acpi_device *device)
{
int res;
struct acpi_power_meter_resource *resource;
if (!device)
return -EINVAL;
resource = kzalloc(sizeof(struct acpi_power_meter_resource),
GFP_KERNEL);
if (!resource)
return -ENOMEM;
resource->sensors_valid = 0;
resource->acpi_dev = device;
mutex_init(&resource->lock);
strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
device->driver_data = resource;
free_capabilities(resource);
res = read_capabilities(resource);
if (res)
goto exit_free;
resource->trip[0] = resource->trip[1] = -1;
res = setup_attrs(resource);
if (res)
goto exit_free;
resource->hwmon_dev = hwmon_device_register(&device->dev);
if (IS_ERR(resource->hwmon_dev)) {
res = PTR_ERR(resource->hwmon_dev);
goto exit_remove;
}
res = 0;
goto exit;
exit_remove:
remove_attrs(resource);
exit_free:
kfree(resource);
exit:
return res;
}
static int acpi_power_meter_remove(struct acpi_device *device)
{
struct acpi_power_meter_resource *resource;
if (!device || !acpi_driver_data(device))
return -EINVAL;
resource = acpi_driver_data(device);
hwmon_device_unregister(resource->hwmon_dev);
free_capabilities(resource);
remove_attrs(resource);
kfree(resource);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int acpi_power_meter_resume(struct device *dev)
{
struct acpi_power_meter_resource *resource;
if (!dev)
return -EINVAL;
resource = acpi_driver_data(to_acpi_device(dev));
if (!resource)
return -EINVAL;
free_capabilities(resource);
read_capabilities(resource);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume);
static struct acpi_driver acpi_power_meter_driver = {
.name = "power_meter",
.class = ACPI_POWER_METER_CLASS,
.ids = power_meter_ids,
.ops = {
.add = acpi_power_meter_add,
.remove = acpi_power_meter_remove,
.notify = acpi_power_meter_notify,
},
.drv.pm = &acpi_power_meter_pm,
};
/* Module init/exit routines */
static int __init enable_cap_knobs(const struct dmi_system_id *d)
{
cap_in_hardware = 1;
return 0;
}
static const struct dmi_system_id pm_dmi_table[] __initconst = {
{
enable_cap_knobs, "IBM Active Energy Manager",
{
DMI_MATCH(DMI_SYS_VENDOR, "IBM")
},
},
{}
};
static int __init acpi_power_meter_init(void)
{
int result;
if (acpi_disabled)
return -ENODEV;
dmi_check_system(pm_dmi_table);
result = acpi_bus_register_driver(&acpi_power_meter_driver);
if (result < 0)
return result;
return 0;
}
static void __exit acpi_power_meter_exit(void)
{
acpi_bus_unregister_driver(&acpi_power_meter_driver);
}
MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
MODULE_LICENSE("GPL");
module_param(force_cap_on, bool, 0644);
MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
module_init(acpi_power_meter_init);
module_exit(acpi_power_meter_exit);