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1013 lines
23 KiB
1013 lines
23 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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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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|
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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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|
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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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|
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static int cap_in_hardware; |
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static bool force_cap_on; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return sprintf(buf, "%llu\n", val); |
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} |
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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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|
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return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); |
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} |
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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[] = { |
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RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
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RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), |
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{}, |
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}; |
|
|
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static struct sensor_template misc_attrs[] = { |
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RO_SENSOR_TEMPLATE("name", show_name, 0), |
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RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), |
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RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), |
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RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), |
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{}, |
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}; |
|
|
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#undef RO_SENSOR_TEMPLATE |
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#undef RW_SENSOR_TEMPLATE |
|
|
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/* Read power domain data */ |
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static void remove_domain_devices(struct acpi_power_meter_resource *resource) |
|
{ |
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int i; |
|
|
|
if (!resource->num_domain_devices) |
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return; |
|
|
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for (i = 0; i < resource->num_domain_devices; i++) { |
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struct acpi_device *obj = resource->domain_devices[i]; |
|
if (!obj) |
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continue; |
|
|
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sysfs_remove_link(resource->holders_dir, |
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kobject_name(&obj->dev.kobj)); |
|
put_device(&obj->dev); |
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} |
|
|
|
kfree(resource->domain_devices); |
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kobject_put(resource->holders_dir); |
|
resource->num_domain_devices = 0; |
|
} |
|
|
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static int read_domain_devices(struct acpi_power_meter_resource *resource) |
|
{ |
|
int res = 0; |
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int i; |
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
|
union acpi_object *pss; |
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acpi_status status; |
|
|
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status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, |
|
&buffer); |
|
if (ACPI_FAILURE(status)) { |
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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"); |
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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); |
|
*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 <[email protected]>"); |
|
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);
|
|
|