| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * A hwmon driver for ACPI 4.0 power meters |
| * Copyright (C) 2009 IBM |
| * |
| * Author: Darrick J. Wong <darrick.wong@oracle.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/hwmon.h> |
| #include <linux/hwmon-sysfs.h> |
| #include <linux/jiffies.h> |
| #include <linux/mutex.h> |
| #include <linux/dmi.h> |
| #include <linux/slab.h> |
| #include <linux/kdev_t.h> |
| #include <linux/sched.h> |
| #include <linux/time.h> |
| #include <linux/err.h> |
| #include <linux/acpi.h> |
| |
| #define ACPI_POWER_METER_NAME "power_meter" |
| #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" |
| #define ACPI_POWER_METER_CLASS "pwr_meter_resource" |
| |
| #define NUM_SENSORS 17 |
| |
| #define POWER_METER_CAN_MEASURE (1 << 0) |
| #define POWER_METER_CAN_TRIP (1 << 1) |
| #define POWER_METER_CAN_CAP (1 << 2) |
| #define POWER_METER_CAN_NOTIFY (1 << 3) |
| #define POWER_METER_IS_BATTERY (1 << 8) |
| #define UNKNOWN_HYSTERESIS 0xFFFFFFFF |
| |
| #define METER_NOTIFY_CONFIG 0x80 |
| #define METER_NOTIFY_TRIP 0x81 |
| #define METER_NOTIFY_CAP 0x82 |
| #define METER_NOTIFY_CAPPING 0x83 |
| #define METER_NOTIFY_INTERVAL 0x84 |
| |
| #define POWER_AVERAGE_NAME "power1_average" |
| #define POWER_CAP_NAME "power1_cap" |
| #define POWER_AVG_INTERVAL_NAME "power1_average_interval" |
| #define POWER_ALARM_NAME "power1_alarm" |
| |
| static int cap_in_hardware; |
| static bool force_cap_on; |
| |
| static int can_cap_in_hardware(void) |
| { |
| return force_cap_on || cap_in_hardware; |
| } |
| |
| static const struct acpi_device_id power_meter_ids[] = { |
| {"ACPI000D", 0}, |
| {"", 0}, |
| }; |
| MODULE_DEVICE_TABLE(acpi, power_meter_ids); |
| |
| struct acpi_power_meter_capabilities { |
| u64 flags; |
| u64 units; |
| u64 type; |
| u64 accuracy; |
| u64 sampling_time; |
| u64 min_avg_interval; |
| u64 max_avg_interval; |
| u64 hysteresis; |
| u64 configurable_cap; |
| u64 min_cap; |
| u64 max_cap; |
| }; |
| |
| struct acpi_power_meter_resource { |
| struct acpi_device *acpi_dev; |
| acpi_bus_id name; |
| struct mutex lock; |
| struct device *hwmon_dev; |
| struct acpi_power_meter_capabilities caps; |
| acpi_string model_number; |
| acpi_string serial_number; |
| acpi_string oem_info; |
| u64 power; |
| u64 cap; |
| u64 avg_interval; |
| int sensors_valid; |
| unsigned long sensors_last_updated; |
| struct sensor_device_attribute sensors[NUM_SENSORS]; |
| int num_sensors; |
| s64 trip[2]; |
| int num_domain_devices; |
| struct acpi_device **domain_devices; |
| struct kobject *holders_dir; |
| }; |
| |
| struct sensor_template { |
| char *label; |
| ssize_t (*show)(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf); |
| ssize_t (*set)(struct device *dev, |
| struct device_attribute *devattr, |
| const char *buf, size_t count); |
| int index; |
| }; |
| |
| /* Averaging interval */ |
| static int update_avg_interval(struct acpi_power_meter_resource *resource) |
| { |
| unsigned long long data; |
| acpi_status status; |
| |
| status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", |
| NULL, &data); |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI", |
| status); |
| return -ENODEV; |
| } |
| |
| resource->avg_interval = data; |
| return 0; |
| } |
| |
| static ssize_t show_avg_interval(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| |
| mutex_lock(&resource->lock); |
| update_avg_interval(resource); |
| mutex_unlock(&resource->lock); |
| |
| return sprintf(buf, "%llu\n", resource->avg_interval); |
| } |
| |
| static ssize_t set_avg_interval(struct device *dev, |
| struct device_attribute *devattr, |
| const char *buf, size_t count) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| union acpi_object arg0 = { ACPI_TYPE_INTEGER }; |
| struct acpi_object_list args = { 1, &arg0 }; |
| int res; |
| unsigned long temp; |
| unsigned long long data; |
| acpi_status status; |
| |
| res = kstrtoul(buf, 10, &temp); |
| if (res) |
| return res; |
| |
| if (temp > resource->caps.max_avg_interval || |
| temp < resource->caps.min_avg_interval) |
| return -EINVAL; |
| arg0.integer.value = temp; |
| |
| mutex_lock(&resource->lock); |
| status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", |
| &args, &data); |
| if (ACPI_SUCCESS(status)) |
| resource->avg_interval = temp; |
| mutex_unlock(&resource->lock); |
| |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI", |
| status); |
| return -EINVAL; |
| } |
| |
| /* _PAI returns 0 on success, nonzero otherwise */ |
| if (data) |
| return -EINVAL; |
| |
| return count; |
| } |
| |
| /* Cap functions */ |
| static int update_cap(struct acpi_power_meter_resource *resource) |
| { |
| unsigned long long data; |
| acpi_status status; |
| |
| status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", |
| NULL, &data); |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL", |
| status); |
| return -ENODEV; |
| } |
| |
| resource->cap = data; |
| return 0; |
| } |
| |
| static ssize_t show_cap(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| |
| mutex_lock(&resource->lock); |
| update_cap(resource); |
| mutex_unlock(&resource->lock); |
| |
| return sprintf(buf, "%llu\n", resource->cap * 1000); |
| } |
| |
| static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, |
| const char *buf, size_t count) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| union acpi_object arg0 = { ACPI_TYPE_INTEGER }; |
| struct acpi_object_list args = { 1, &arg0 }; |
| int res; |
| unsigned long temp; |
| unsigned long long data; |
| acpi_status status; |
| |
| res = kstrtoul(buf, 10, &temp); |
| if (res) |
| return res; |
| |
| temp = DIV_ROUND_CLOSEST(temp, 1000); |
| if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
| return -EINVAL; |
| arg0.integer.value = temp; |
| |
| mutex_lock(&resource->lock); |
| status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", |
| &args, &data); |
| if (ACPI_SUCCESS(status)) |
| resource->cap = temp; |
| mutex_unlock(&resource->lock); |
| |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL", |
| status); |
| return -EINVAL; |
| } |
| |
| /* _SHL returns 0 on success, nonzero otherwise */ |
| if (data) |
| return -EINVAL; |
| |
| return count; |
| } |
| |
| /* Power meter trip points */ |
| static int set_acpi_trip(struct acpi_power_meter_resource *resource) |
| { |
| union acpi_object arg_objs[] = { |
| {ACPI_TYPE_INTEGER}, |
| {ACPI_TYPE_INTEGER} |
| }; |
| struct acpi_object_list args = { 2, arg_objs }; |
| unsigned long long data; |
| acpi_status status; |
| |
| /* Both trip levels must be set */ |
| if (resource->trip[0] < 0 || resource->trip[1] < 0) |
| return 0; |
| |
| /* This driver stores min, max; ACPI wants max, min. */ |
| arg_objs[0].integer.value = resource->trip[1]; |
| arg_objs[1].integer.value = resource->trip[0]; |
| |
| status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", |
| &args, &data); |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP", |
| status); |
| return -EINVAL; |
| } |
| |
| /* _PTP returns 0 on success, nonzero otherwise */ |
| if (data) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, |
| const char *buf, size_t count) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| int res; |
| unsigned long temp; |
| |
| res = kstrtoul(buf, 10, &temp); |
| if (res) |
| return res; |
| |
| temp = DIV_ROUND_CLOSEST(temp, 1000); |
| |
| mutex_lock(&resource->lock); |
| resource->trip[attr->index - 7] = temp; |
| res = set_acpi_trip(resource); |
| mutex_unlock(&resource->lock); |
| |
| if (res) |
| return res; |
| |
| return count; |
| } |
| |
| /* Power meter */ |
| static int update_meter(struct acpi_power_meter_resource *resource) |
| { |
| unsigned long long data; |
| acpi_status status; |
| unsigned long local_jiffies = jiffies; |
| |
| if (time_before(local_jiffies, resource->sensors_last_updated + |
| msecs_to_jiffies(resource->caps.sampling_time)) && |
| resource->sensors_valid) |
| return 0; |
| |
| status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", |
| NULL, &data); |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM", |
| status); |
| return -ENODEV; |
| } |
| |
| resource->power = data; |
| resource->sensors_valid = 1; |
| resource->sensors_last_updated = jiffies; |
| return 0; |
| } |
| |
| static ssize_t show_power(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| |
| mutex_lock(&resource->lock); |
| update_meter(resource); |
| mutex_unlock(&resource->lock); |
| |
| return sprintf(buf, "%llu\n", resource->power * 1000); |
| } |
| |
| /* Miscellaneous */ |
| static ssize_t show_str(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| acpi_string val; |
| int ret; |
| |
| mutex_lock(&resource->lock); |
| switch (attr->index) { |
| case 0: |
| val = resource->model_number; |
| break; |
| case 1: |
| val = resource->serial_number; |
| break; |
| case 2: |
| val = resource->oem_info; |
| break; |
| default: |
| WARN(1, "Implementation error: unexpected attribute index %d\n", |
| attr->index); |
| val = ""; |
| break; |
| } |
| ret = sprintf(buf, "%s\n", val); |
| mutex_unlock(&resource->lock); |
| return ret; |
| } |
| |
| static ssize_t show_val(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| u64 val = 0; |
| |
| switch (attr->index) { |
| case 0: |
| val = resource->caps.min_avg_interval; |
| break; |
| case 1: |
| val = resource->caps.max_avg_interval; |
| break; |
| case 2: |
| val = resource->caps.min_cap * 1000; |
| break; |
| case 3: |
| val = resource->caps.max_cap * 1000; |
| break; |
| case 4: |
| if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) |
| return sprintf(buf, "unknown\n"); |
| |
| val = resource->caps.hysteresis * 1000; |
| break; |
| case 5: |
| if (resource->caps.flags & POWER_METER_IS_BATTERY) |
| val = 1; |
| else |
| val = 0; |
| break; |
| case 6: |
| if (resource->power > resource->cap) |
| val = 1; |
| else |
| val = 0; |
| break; |
| case 7: |
| case 8: |
| if (resource->trip[attr->index - 7] < 0) |
| return sprintf(buf, "unknown\n"); |
| |
| val = resource->trip[attr->index - 7] * 1000; |
| break; |
| default: |
| WARN(1, "Implementation error: unexpected attribute index %d\n", |
| attr->index); |
| break; |
| } |
| |
| return sprintf(buf, "%llu\n", val); |
| } |
| |
| static ssize_t show_accuracy(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| struct acpi_device *acpi_dev = to_acpi_device(dev); |
| struct acpi_power_meter_resource *resource = acpi_dev->driver_data; |
| unsigned int acc = resource->caps.accuracy; |
| |
| return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); |
| } |
| |
| static ssize_t show_name(struct device *dev, |
| struct device_attribute *devattr, |
| char *buf) |
| { |
| return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); |
| } |
| |
| #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
| { \ |
| .label = _label, \ |
| .show = _show, \ |
| .index = _index, \ |
| } |
| |
| #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ |
| { \ |
| .label = _label, \ |
| .show = _show, \ |
| .set = _set, \ |
| .index = _index, \ |
| } |
| |
| /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
| static struct sensor_template meter_attrs[] = { |
| RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
| RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), |
| RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), |
| RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), |
| RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), |
| RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
| set_avg_interval, 0), |
| {}, |
| }; |
| |
| static struct sensor_template misc_cap_attrs[] = { |
| RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
| RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), |
| RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), |
| RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), |
| {}, |
| }; |
| |
| static struct sensor_template ro_cap_attrs[] = { |
| RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
| {}, |
| }; |
| |
| static struct sensor_template rw_cap_attrs[] = { |
| RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
| {}, |
| }; |
| |
| static struct sensor_template trip_attrs[] = { |
| RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
| RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), |
| {}, |
| }; |
| |
| static struct sensor_template misc_attrs[] = { |
| RO_SENSOR_TEMPLATE("name", show_name, 0), |
| RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), |
| RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), |
| RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), |
| {}, |
| }; |
| |
| #undef RO_SENSOR_TEMPLATE |
| #undef RW_SENSOR_TEMPLATE |
| |
| /* Read power domain data */ |
| static void remove_domain_devices(struct acpi_power_meter_resource *resource) |
| { |
| int i; |
| |
| if (!resource->num_domain_devices) |
| return; |
| |
| for (i = 0; i < resource->num_domain_devices; i++) { |
| struct acpi_device *obj = resource->domain_devices[i]; |
| |
| if (!obj) |
| continue; |
| |
| sysfs_remove_link(resource->holders_dir, |
| kobject_name(&obj->dev.kobj)); |
| 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(*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] = -1; |
| 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); |