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2c59a32d12
In read_domain_devices(), acpi_bus_get_device() is called to obtain the ACPI device object attached to the given ACPI handle and subsequently that object is passed to get_device() for reference counting, but there is a window between the acpi_bus_get_device() and get_device() calls in which the ACPI device object in question may go away. To address this issue, make read_domain_devices() use acpi_bus_get_acpi_device() to reference count and return the given ACPI device object in one go and export that function to modules. While at it, also make read_domain_devices() and remove_domain_devices() use acpi_dev_put() instead of calling put_device() directly on the ACPI device objects returned by acpi_bus_get_acpi_device(). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/11871063.O9o76ZdvQC@kreacher Signed-off-by: Guenter Roeck <linux@roeck-us.net>
1011 lines
23 KiB
C
1011 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* A hwmon driver for ACPI 4.0 power meters
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* Copyright (C) 2009 IBM
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#include <linux/module.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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#include <linux/mutex.h>
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#include <linux/dmi.h>
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#include <linux/slab.h>
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#include <linux/kdev_t.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/err.h>
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#include <linux/acpi.h>
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#define ACPI_POWER_METER_NAME "power_meter"
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#define ACPI_POWER_METER_DEVICE_NAME "Power Meter"
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#define ACPI_POWER_METER_CLASS "pwr_meter_resource"
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#define NUM_SENSORS 17
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#define POWER_METER_CAN_MEASURE (1 << 0)
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#define POWER_METER_CAN_TRIP (1 << 1)
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#define POWER_METER_CAN_CAP (1 << 2)
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#define POWER_METER_CAN_NOTIFY (1 << 3)
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#define POWER_METER_IS_BATTERY (1 << 8)
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#define UNKNOWN_HYSTERESIS 0xFFFFFFFF
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#define METER_NOTIFY_CONFIG 0x80
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#define METER_NOTIFY_TRIP 0x81
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#define METER_NOTIFY_CAP 0x82
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#define METER_NOTIFY_CAPPING 0x83
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#define METER_NOTIFY_INTERVAL 0x84
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#define POWER_AVERAGE_NAME "power1_average"
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#define POWER_CAP_NAME "power1_cap"
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#define POWER_AVG_INTERVAL_NAME "power1_average_interval"
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#define POWER_ALARM_NAME "power1_alarm"
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static int cap_in_hardware;
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static bool force_cap_on;
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static int can_cap_in_hardware(void)
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{
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return force_cap_on || cap_in_hardware;
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}
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static const struct acpi_device_id power_meter_ids[] = {
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{"ACPI000D", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, power_meter_ids);
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struct acpi_power_meter_capabilities {
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u64 flags;
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u64 units;
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u64 type;
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u64 accuracy;
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u64 sampling_time;
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u64 min_avg_interval;
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u64 max_avg_interval;
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u64 hysteresis;
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u64 configurable_cap;
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u64 min_cap;
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u64 max_cap;
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};
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struct acpi_power_meter_resource {
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struct acpi_device *acpi_dev;
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acpi_bus_id name;
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struct mutex lock;
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struct device *hwmon_dev;
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struct acpi_power_meter_capabilities caps;
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acpi_string model_number;
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acpi_string serial_number;
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acpi_string oem_info;
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u64 power;
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u64 cap;
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u64 avg_interval;
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int sensors_valid;
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unsigned long sensors_last_updated;
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struct sensor_device_attribute sensors[NUM_SENSORS];
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int num_sensors;
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s64 trip[2];
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int num_domain_devices;
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struct acpi_device **domain_devices;
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struct kobject *holders_dir;
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};
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struct sensor_template {
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char *label;
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ssize_t (*show)(struct device *dev,
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struct device_attribute *devattr,
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char *buf);
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ssize_t (*set)(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count);
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int index;
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};
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/* Averaging interval */
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static int update_avg_interval(struct acpi_power_meter_resource *resource)
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{
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unsigned long long data;
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acpi_status status;
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
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NULL, &data);
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if (ACPI_FAILURE(status)) {
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acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI",
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status);
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return -ENODEV;
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}
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resource->avg_interval = data;
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return 0;
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}
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static ssize_t show_avg_interval(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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mutex_lock(&resource->lock);
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update_avg_interval(resource);
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mutex_unlock(&resource->lock);
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return sprintf(buf, "%llu\n", resource->avg_interval);
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}
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static ssize_t set_avg_interval(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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union acpi_object arg0 = { ACPI_TYPE_INTEGER };
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struct acpi_object_list args = { 1, &arg0 };
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int res;
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unsigned long temp;
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unsigned long long data;
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acpi_status status;
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res = kstrtoul(buf, 10, &temp);
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if (res)
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return res;
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if (temp > resource->caps.max_avg_interval ||
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temp < resource->caps.min_avg_interval)
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return -EINVAL;
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arg0.integer.value = temp;
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mutex_lock(&resource->lock);
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
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&args, &data);
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if (ACPI_SUCCESS(status))
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resource->avg_interval = temp;
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mutex_unlock(&resource->lock);
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if (ACPI_FAILURE(status)) {
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acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI",
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status);
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return -EINVAL;
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}
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/* _PAI returns 0 on success, nonzero otherwise */
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if (data)
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return -EINVAL;
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return count;
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}
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/* Cap functions */
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static int update_cap(struct acpi_power_meter_resource *resource)
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{
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unsigned long long data;
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acpi_status status;
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
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NULL, &data);
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if (ACPI_FAILURE(status)) {
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acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL",
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status);
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return -ENODEV;
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}
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resource->cap = data;
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return 0;
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}
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static ssize_t show_cap(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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mutex_lock(&resource->lock);
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update_cap(resource);
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mutex_unlock(&resource->lock);
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return sprintf(buf, "%llu\n", resource->cap * 1000);
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}
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static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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union acpi_object arg0 = { ACPI_TYPE_INTEGER };
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struct acpi_object_list args = { 1, &arg0 };
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int res;
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unsigned long temp;
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unsigned long long data;
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acpi_status status;
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res = kstrtoul(buf, 10, &temp);
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if (res)
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return res;
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temp = DIV_ROUND_CLOSEST(temp, 1000);
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if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
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return -EINVAL;
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arg0.integer.value = temp;
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mutex_lock(&resource->lock);
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
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&args, &data);
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if (ACPI_SUCCESS(status))
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resource->cap = temp;
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mutex_unlock(&resource->lock);
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if (ACPI_FAILURE(status)) {
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acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL",
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status);
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return -EINVAL;
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}
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/* _SHL returns 0 on success, nonzero otherwise */
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if (data)
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return -EINVAL;
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return count;
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}
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/* Power meter trip points */
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static int set_acpi_trip(struct acpi_power_meter_resource *resource)
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{
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union acpi_object arg_objs[] = {
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{ACPI_TYPE_INTEGER},
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{ACPI_TYPE_INTEGER}
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};
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struct acpi_object_list args = { 2, arg_objs };
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unsigned long long data;
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acpi_status status;
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/* Both trip levels must be set */
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if (resource->trip[0] < 0 || resource->trip[1] < 0)
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return 0;
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/* This driver stores min, max; ACPI wants max, min. */
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arg_objs[0].integer.value = resource->trip[1];
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arg_objs[1].integer.value = resource->trip[0];
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
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&args, &data);
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if (ACPI_FAILURE(status)) {
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acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP",
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status);
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return -EINVAL;
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}
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/* _PTP returns 0 on success, nonzero otherwise */
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if (data)
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return -EINVAL;
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return 0;
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}
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static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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int res;
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unsigned long temp;
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res = kstrtoul(buf, 10, &temp);
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if (res)
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return res;
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temp = DIV_ROUND_CLOSEST(temp, 1000);
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mutex_lock(&resource->lock);
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resource->trip[attr->index - 7] = temp;
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res = set_acpi_trip(resource);
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mutex_unlock(&resource->lock);
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if (res)
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return res;
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return count;
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}
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/* Power meter */
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static int update_meter(struct acpi_power_meter_resource *resource)
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{
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unsigned long long data;
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acpi_status status;
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unsigned long local_jiffies = jiffies;
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if (time_before(local_jiffies, resource->sensors_last_updated +
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msecs_to_jiffies(resource->caps.sampling_time)) &&
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resource->sensors_valid)
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return 0;
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
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NULL, &data);
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if (ACPI_FAILURE(status)) {
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acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM",
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status);
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return -ENODEV;
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}
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resource->power = data;
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resource->sensors_valid = 1;
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resource->sensors_last_updated = jiffies;
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return 0;
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}
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static ssize_t show_power(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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mutex_lock(&resource->lock);
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update_meter(resource);
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mutex_unlock(&resource->lock);
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return sprintf(buf, "%llu\n", resource->power * 1000);
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}
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/* Miscellaneous */
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static ssize_t show_str(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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acpi_string val;
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int ret;
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mutex_lock(&resource->lock);
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switch (attr->index) {
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case 0:
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val = resource->model_number;
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break;
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case 1:
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val = resource->serial_number;
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break;
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case 2:
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val = resource->oem_info;
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break;
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default:
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WARN(1, "Implementation error: unexpected attribute index %d\n",
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attr->index);
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val = "";
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break;
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}
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ret = sprintf(buf, "%s\n", val);
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mutex_unlock(&resource->lock);
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return ret;
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}
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static ssize_t show_val(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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u64 val = 0;
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switch (attr->index) {
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case 0:
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val = resource->caps.min_avg_interval;
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break;
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case 1:
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val = resource->caps.max_avg_interval;
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break;
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case 2:
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val = resource->caps.min_cap * 1000;
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break;
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case 3:
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val = resource->caps.max_cap * 1000;
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break;
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case 4:
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if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
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return sprintf(buf, "unknown\n");
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val = resource->caps.hysteresis * 1000;
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break;
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case 5:
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if (resource->caps.flags & POWER_METER_IS_BATTERY)
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val = 1;
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else
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val = 0;
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break;
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case 6:
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if (resource->power > resource->cap)
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val = 1;
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else
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val = 0;
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break;
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case 7:
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case 8:
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if (resource->trip[attr->index - 7] < 0)
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return sprintf(buf, "unknown\n");
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val = resource->trip[attr->index - 7] * 1000;
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break;
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default:
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WARN(1, "Implementation error: unexpected attribute index %d\n",
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attr->index);
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break;
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}
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return sprintf(buf, "%llu\n", val);
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}
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static ssize_t show_accuracy(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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unsigned int acc = resource->caps.accuracy;
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return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
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}
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static ssize_t show_name(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
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}
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#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
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{ \
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.label = _label, \
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.show = _show, \
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.index = _index, \
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}
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#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
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{ \
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.label = _label, \
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.show = _show, \
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.set = _set, \
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.index = _index, \
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}
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/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
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static struct sensor_template meter_attrs[] = {
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RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
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RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
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RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
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RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
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RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
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RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
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set_avg_interval, 0),
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{},
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};
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static struct sensor_template misc_cap_attrs[] = {
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RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
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RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
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RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
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RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
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{},
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};
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static struct sensor_template ro_cap_attrs[] = {
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RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
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{},
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};
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static struct sensor_template rw_cap_attrs[] = {
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RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
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{},
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};
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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));
|
|
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 = 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 */
|
|
obj = acpi_bus_get_acpi_device(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;
|
|
}
|
|
|
|
/* 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);
|
|
*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;
|
|
}
|
|
|
|
/* 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)) {
|
|
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;
|
|
}
|
|
|
|
/* 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:
|
|
free_capabilities(resource);
|
|
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);
|
|
|
|
switch (event) {
|
|
case METER_NOTIFY_CONFIG:
|
|
mutex_lock(&resource->lock);
|
|
free_capabilities(resource);
|
|
res = read_capabilities(resource);
|
|
mutex_unlock(&resource->lock);
|
|
if (res)
|
|
break;
|
|
|
|
remove_attrs(resource);
|
|
setup_attrs(resource);
|
|
break;
|
|
case METER_NOTIFY_TRIP:
|
|
sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
|
|
break;
|
|
case METER_NOTIFY_CAP:
|
|
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:
|
|
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(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;
|
|
|
|
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_capability;
|
|
|
|
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_capability:
|
|
free_capabilities(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);
|
|
|
|
remove_attrs(resource);
|
|
free_capabilities(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);
|