#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"
#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 UNKNOWN_POWER 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 DEFINE_MUTEX(acpi_notify_lock);
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;
bool power_alarm;
int sensors_valid;
unsigned long sensors_last_updated;
#define POWER_METER_TRIP_AVERAGE_MIN_IDX 0
#define POWER_METER_TRIP_AVERAGE_MAX_IDX 1
s64 trip[2];
int num_domain_devices;
struct acpi_device **domain_devices;
struct kobject *holders_dir;
};
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_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI",
status);
return -ENODEV;
}
resource->avg_interval = data;
return 0;
}
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_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL",
status);
return -ENODEV;
}
resource->cap = data;
return 0;
}
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;
if (resource->trip[0] < 0 || resource->trip[1] < 0)
return 0;
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_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP",
status);
return -EINVAL;
}
if (data)
return -EINVAL;
return 0;
}
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_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM",
status);
return -ENODEV;
}
resource->power = data;
resource->sensors_valid = 1;
resource->sensors_last_updated = jiffies;
return 0;
}
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));
acpi_dev_put(obj);
}
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_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD",
status);
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 = kzalloc_objs(struct acpi_device *,
pss->package.count);
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];
if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
continue;
obj = acpi_get_acpi_dev(element->reference.handle);
resource->domain_devices[i] = obj;
if (!obj)
continue;
res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
kobject_name(&obj->dev.kobj));
if (res) {
acpi_dev_put(obj);
resource->domain_devices[i] = NULL;
}
}
res = 0;
goto end;
exit_free:
kfree(resource->domain_devices);
end:
kfree(buffer.pointer);
return res;
}
static int set_trip(struct acpi_power_meter_resource *resource, u16 trip_idx,
unsigned long trip)
{
unsigned long trip_bk;
int ret;
trip = DIV_ROUND_CLOSEST(trip, 1000);
trip_bk = resource->trip[trip_idx];
resource->trip[trip_idx] = trip;
ret = set_acpi_trip(resource);
if (ret) {
dev_err(&resource->acpi_dev->dev, "set %s failed.\n",
(trip_idx == POWER_METER_TRIP_AVERAGE_MIN_IDX) ?
"power1_average_min" : "power1_average_max");
resource->trip[trip_idx] = trip_bk;
}
return ret;
}
static int set_cap(struct acpi_power_meter_resource *resource,
unsigned long cap)
{
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
unsigned long long data;
acpi_status status;
cap = DIV_ROUND_CLOSEST(cap, 1000);
if (cap > resource->caps.max_cap || cap < resource->caps.min_cap)
return -EINVAL;
arg0.integer.value = cap;
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
&args, &data);
if (ACPI_FAILURE(status)) {
acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL",
status);
return -EINVAL;
}
resource->cap = cap;
if (data)
return -EINVAL;
return 0;
}
static int set_avg_interval(struct acpi_power_meter_resource *resource,
unsigned long val)
{
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
unsigned long long data;
acpi_status status;
if (val > resource->caps.max_avg_interval ||
val < resource->caps.min_avg_interval)
return -EINVAL;
arg0.integer.value = val;
status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
&args, &data);
if (ACPI_FAILURE(status)) {
acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI",
status);
return -EINVAL;
}
resource->avg_interval = val;
if (data)
return -EINVAL;
return 0;
}
static int get_power_alarm_state(struct acpi_power_meter_resource *resource,
long *val)
{
int ret;
ret = update_meter(resource);
if (ret)
return ret;
if (!(resource->caps.flags & POWER_METER_CAN_NOTIFY)) {
ret = update_cap(resource);
if (ret)
return ret;
resource->power_alarm = resource->power > resource->cap;
*val = resource->power_alarm;
} else {
*val = resource->power_alarm || resource->power > resource->cap;
resource->power_alarm = resource->power > resource->cap;
}
return 0;
}
static umode_t power_meter_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct acpi_power_meter_resource *res = data;
if (type != hwmon_power)
return 0;
switch (attr) {
case hwmon_power_average:
case hwmon_power_average_interval_min:
case hwmon_power_average_interval_max:
if (res->caps.flags & POWER_METER_CAN_MEASURE)
return 0444;
break;
case hwmon_power_average_interval:
if (res->caps.flags & POWER_METER_CAN_MEASURE)
return 0644;
break;
case hwmon_power_cap_min:
case hwmon_power_cap_max:
case hwmon_power_alarm:
if (res->caps.flags & POWER_METER_CAN_CAP && can_cap_in_hardware())
return 0444;
break;
case hwmon_power_cap:
if (res->caps.flags & POWER_METER_CAN_CAP && can_cap_in_hardware()) {
if (res->caps.configurable_cap)
return 0644;
else
return 0444;
}
break;
default:
break;
}
return 0;
}
static int power_meter_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
int ret = 0;
if (type != hwmon_power)
return -EINVAL;
guard(mutex)(&res->lock);
switch (attr) {
case hwmon_power_average:
ret = update_meter(res);
if (ret)
return ret;
if (res->power == UNKNOWN_POWER)
return -ENODATA;
*val = res->power * 1000;
break;
case hwmon_power_average_interval_min:
*val = res->caps.min_avg_interval;
break;
case hwmon_power_average_interval_max:
*val = res->caps.max_avg_interval;
break;
case hwmon_power_average_interval:
ret = update_avg_interval(res);
if (ret)
return ret;
*val = (res)->avg_interval;
break;
case hwmon_power_cap_min:
*val = res->caps.min_cap * 1000;
break;
case hwmon_power_cap_max:
*val = res->caps.max_cap * 1000;
break;
case hwmon_power_alarm:
ret = get_power_alarm_state(res, val);
if (ret)
return ret;
break;
case hwmon_power_cap:
ret = update_cap(res);
if (ret)
return ret;
*val = res->cap * 1000;
break;
default:
break;
}
return 0;
}
static int power_meter_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
int ret;
if (type != hwmon_power)
return -EINVAL;
guard(mutex)(&res->lock);
switch (attr) {
case hwmon_power_cap:
ret = set_cap(res, val);
break;
case hwmon_power_average_interval:
ret = set_avg_interval(res, val);
break;
default:
ret = -EOPNOTSUPP;
}
return ret;
}
static const struct hwmon_channel_info * const power_meter_info[] = {
HWMON_CHANNEL_INFO(power, HWMON_P_AVERAGE |
HWMON_P_AVERAGE_INTERVAL | HWMON_P_AVERAGE_INTERVAL_MIN |
HWMON_P_AVERAGE_INTERVAL_MAX | HWMON_P_CAP | HWMON_P_CAP_MIN |
HWMON_P_CAP_MAX | HWMON_P_ALARM),
NULL
};
static const struct hwmon_ops power_meter_ops = {
.is_visible = power_meter_is_visible,
.read = power_meter_read,
.write = power_meter_write,
};
static const struct hwmon_chip_info power_meter_chip_info = {
.ops = &power_meter_ops,
.info = power_meter_info,
};
static ssize_t power1_average_max_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
unsigned long trip;
int ret;
ret = kstrtoul(buf, 10, &trip);
if (ret)
return ret;
mutex_lock(&res->lock);
ret = set_trip(res, POWER_METER_TRIP_AVERAGE_MAX_IDX, trip);
mutex_unlock(&res->lock);
return ret == 0 ? count : ret;
}
static ssize_t power1_average_min_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
unsigned long trip;
int ret;
ret = kstrtoul(buf, 10, &trip);
if (ret)
return ret;
mutex_lock(&res->lock);
ret = set_trip(res, POWER_METER_TRIP_AVERAGE_MIN_IDX, trip);
mutex_unlock(&res->lock);
return ret == 0 ? count : ret;
}
static ssize_t power1_average_min_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
if (res->trip[POWER_METER_TRIP_AVERAGE_MIN_IDX] < 0)
return sysfs_emit(buf, "unknown\n");
return sysfs_emit(buf, "%lld\n",
res->trip[POWER_METER_TRIP_AVERAGE_MIN_IDX] * 1000);
}
static ssize_t power1_average_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
if (res->trip[POWER_METER_TRIP_AVERAGE_MAX_IDX] < 0)
return sysfs_emit(buf, "unknown\n");
return sysfs_emit(buf, "%lld\n",
res->trip[POWER_METER_TRIP_AVERAGE_MAX_IDX] * 1000);
}
static ssize_t power1_cap_hyst_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
if (res->caps.hysteresis == UNKNOWN_HYSTERESIS)
return sysfs_emit(buf, "unknown\n");
return sysfs_emit(buf, "%llu\n", res->caps.hysteresis * 1000);
}
static ssize_t power1_accuracy_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
unsigned int acc = res->caps.accuracy;
return sysfs_emit(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
}
static ssize_t power1_is_battery_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
return sysfs_emit(buf, "%u\n",
res->caps.flags & POWER_METER_IS_BATTERY ? 1 : 0);
}
static ssize_t power1_model_number_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
return sysfs_emit(buf, "%s\n", res->model_number);
}
static ssize_t power1_oem_info_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
return sysfs_emit(buf, "%s\n", res->oem_info);
}
static ssize_t power1_serial_number_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
return sysfs_emit(buf, "%s\n", res->serial_number);
}
static DEVICE_ATTR_RW(power1_average_max);
static DEVICE_ATTR_RW(power1_average_min);
static DEVICE_ATTR_RO(power1_cap_hyst);
static DEVICE_ATTR_RO(power1_accuracy);
static DEVICE_ATTR_RO(power1_is_battery);
static DEVICE_ATTR_RO(power1_model_number);
static DEVICE_ATTR_RO(power1_oem_info);
static DEVICE_ATTR_RO(power1_serial_number);
static umode_t power_extra_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct acpi_power_meter_resource *res = dev_get_drvdata(dev);
if (attr == &dev_attr_power1_is_battery.attr ||
attr == &dev_attr_power1_accuracy.attr) {
if ((res->caps.flags & POWER_METER_CAN_MEASURE) == 0)
return 0;
}
if (attr == &dev_attr_power1_cap_hyst.attr) {
if ((res->caps.flags & POWER_METER_CAN_CAP) == 0) {
return 0;
} else if (!can_cap_in_hardware()) {
dev_warn(&res->acpi_dev->dev,
"Ignoring unsafe software power cap!\n");
return 0;
}
}
if (attr == &dev_attr_power1_average_max.attr ||
attr == &dev_attr_power1_average_min.attr) {
if ((res->caps.flags & POWER_METER_CAN_TRIP) == 0)
return 0;
}
return attr->mode;
}
static struct attribute *power_extra_attrs[] = {
&dev_attr_power1_average_max.attr,
&dev_attr_power1_average_min.attr,
&dev_attr_power1_cap_hyst.attr,
&dev_attr_power1_accuracy.attr,
&dev_attr_power1_is_battery.attr,
&dev_attr_power1_model_number.attr,
&dev_attr_power1_oem_info.attr,
&dev_attr_power1_serial_number.attr,
NULL
};
static const struct attribute_group power_extra_group = {
.attrs = power_extra_attrs,
.is_visible = power_extra_is_visible,
};
__ATTRIBUTE_GROUPS(power_extra);
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);
*str = NULL;
}
}
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_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC",
status);
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;
}
state.length = sizeof(struct acpi_power_meter_capabilities);
state.pointer = &resource->caps;
status = acpi_extract_package(pss, &format, &state);
if (ACPI_FAILURE(status)) {
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
"_PMC package parsing failed: %s\n",
acpi_format_exception(status));
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;
}
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 = kmemdup_nul(element->string.pointer, element->string.length,
GFP_KERNEL);
if (!*str) {
res = -ENOMEM;
goto error;
}
str++;
}
dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
goto end;
error:
free_capabilities(resource);
end:
kfree(buffer.pointer);
return res;
}
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);
guard(mutex)(&acpi_notify_lock);
switch (event) {
case METER_NOTIFY_CONFIG:
if (!IS_ERR(resource->hwmon_dev))
hwmon_device_unregister(resource->hwmon_dev);
mutex_lock(&resource->lock);
free_capabilities(resource);
remove_domain_devices(resource);
res = read_capabilities(resource);
if (res)
dev_err_once(&device->dev, "read capabilities failed.\n");
res = read_domain_devices(resource);
if (res && res != -ENODEV)
dev_err_once(&device->dev, "read domain devices failed.\n");
mutex_unlock(&resource->lock);
resource->hwmon_dev =
hwmon_device_register_with_info(&device->dev,
ACPI_POWER_METER_NAME,
resource,
&power_meter_chip_info,
power_extra_groups);
if (IS_ERR(resource->hwmon_dev))
dev_err_once(&device->dev, "register hwmon device failed.\n");
break;
case METER_NOTIFY_TRIP:
sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
break;
case METER_NOTIFY_CAP:
mutex_lock(&resource->lock);
res = update_cap(resource);
if (res)
dev_err_once(&device->dev, "update cap failed when capping value is changed.\n");
mutex_unlock(&resource->lock);
sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
break;
case METER_NOTIFY_INTERVAL:
sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
break;
case METER_NOTIFY_CAPPING:
mutex_lock(&resource->lock);
resource->power_alarm = true;
mutex_unlock(&resource->lock);
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;
}
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_obj(*resource);
if (!resource)
return -ENOMEM;
resource->sensors_valid = 0;
resource->acpi_dev = device;
mutex_init(&resource->lock);
strscpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
strscpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
device->driver_data = resource;
#if IS_REACHABLE(CONFIG_ACPI_IPMI)
if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.")) {
struct acpi_device *ipi_device = acpi_dev_get_first_match_dev("IPI0001", NULL, -1);
if (ipi_device && acpi_wait_for_acpi_ipmi())
dev_warn(&device->dev, "Waiting for ACPI IPMI timeout");
acpi_dev_put(ipi_device);
}
#endif
res = read_capabilities(resource);
if (res)
goto exit_free;
resource->trip[0] = -1;
resource->trip[1] = -1;
res = read_domain_devices(resource);
if (res && res != -ENODEV)
goto exit_free_capability;
resource->hwmon_dev =
hwmon_device_register_with_info(&device->dev,
ACPI_POWER_METER_NAME, resource,
&power_meter_chip_info,
power_extra_groups);
if (IS_ERR(resource->hwmon_dev)) {
res = PTR_ERR(resource->hwmon_dev);
goto exit_remove;
}
res = 0;
goto exit;
exit_remove:
remove_domain_devices(resource);
exit_free_capability:
free_capabilities(resource);
exit_free:
kfree(resource);
exit:
return res;
}
static void acpi_power_meter_remove(struct acpi_device *device)
{
struct acpi_power_meter_resource *resource;
if (!device || !acpi_driver_data(device))
return;
resource = acpi_driver_data(device);
if (!IS_ERR(resource->hwmon_dev))
hwmon_device_unregister(resource->hwmon_dev);
remove_domain_devices(resource);
free_capabilities(resource);
kfree(resource);
}
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;
}
static DEFINE_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 = pm_sleep_ptr(&acpi_power_meter_pm),
};
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);
