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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * A hwmon driver for ACPI 4.0 power meters
0004  * Copyright (C) 2009 IBM
0005  *
0006  * Author: Darrick J. Wong <darrick.wong@oracle.com>
0007  */
0008 
0009 #include <linux/module.h>
0010 #include <linux/hwmon.h>
0011 #include <linux/hwmon-sysfs.h>
0012 #include <linux/jiffies.h>
0013 #include <linux/mutex.h>
0014 #include <linux/dmi.h>
0015 #include <linux/slab.h>
0016 #include <linux/kdev_t.h>
0017 #include <linux/sched.h>
0018 #include <linux/time.h>
0019 #include <linux/err.h>
0020 #include <linux/acpi.h>
0021 
0022 #define ACPI_POWER_METER_NAME       "power_meter"
0023 #define ACPI_POWER_METER_DEVICE_NAME    "Power Meter"
0024 #define ACPI_POWER_METER_CLASS      "pwr_meter_resource"
0025 
0026 #define NUM_SENSORS         17
0027 
0028 #define POWER_METER_CAN_MEASURE (1 << 0)
0029 #define POWER_METER_CAN_TRIP    (1 << 1)
0030 #define POWER_METER_CAN_CAP (1 << 2)
0031 #define POWER_METER_CAN_NOTIFY  (1 << 3)
0032 #define POWER_METER_IS_BATTERY  (1 << 8)
0033 #define UNKNOWN_HYSTERESIS  0xFFFFFFFF
0034 
0035 #define METER_NOTIFY_CONFIG 0x80
0036 #define METER_NOTIFY_TRIP   0x81
0037 #define METER_NOTIFY_CAP    0x82
0038 #define METER_NOTIFY_CAPPING    0x83
0039 #define METER_NOTIFY_INTERVAL   0x84
0040 
0041 #define POWER_AVERAGE_NAME  "power1_average"
0042 #define POWER_CAP_NAME      "power1_cap"
0043 #define POWER_AVG_INTERVAL_NAME "power1_average_interval"
0044 #define POWER_ALARM_NAME    "power1_alarm"
0045 
0046 static int cap_in_hardware;
0047 static bool force_cap_on;
0048 
0049 static int can_cap_in_hardware(void)
0050 {
0051     return force_cap_on || cap_in_hardware;
0052 }
0053 
0054 static const struct acpi_device_id power_meter_ids[] = {
0055     {"ACPI000D", 0},
0056     {"", 0},
0057 };
0058 MODULE_DEVICE_TABLE(acpi, power_meter_ids);
0059 
0060 struct acpi_power_meter_capabilities {
0061     u64     flags;
0062     u64     units;
0063     u64     type;
0064     u64     accuracy;
0065     u64     sampling_time;
0066     u64     min_avg_interval;
0067     u64     max_avg_interval;
0068     u64     hysteresis;
0069     u64     configurable_cap;
0070     u64     min_cap;
0071     u64     max_cap;
0072 };
0073 
0074 struct acpi_power_meter_resource {
0075     struct acpi_device  *acpi_dev;
0076     acpi_bus_id     name;
0077     struct mutex        lock;
0078     struct device       *hwmon_dev;
0079     struct acpi_power_meter_capabilities    caps;
0080     acpi_string     model_number;
0081     acpi_string     serial_number;
0082     acpi_string     oem_info;
0083     u64     power;
0084     u64     cap;
0085     u64     avg_interval;
0086     int         sensors_valid;
0087     unsigned long       sensors_last_updated;
0088     struct sensor_device_attribute  sensors[NUM_SENSORS];
0089     int         num_sensors;
0090     s64         trip[2];
0091     int         num_domain_devices;
0092     struct acpi_device  **domain_devices;
0093     struct kobject      *holders_dir;
0094 };
0095 
0096 struct sensor_template {
0097     char *label;
0098     ssize_t (*show)(struct device *dev,
0099             struct device_attribute *devattr,
0100             char *buf);
0101     ssize_t (*set)(struct device *dev,
0102                struct device_attribute *devattr,
0103                const char *buf, size_t count);
0104     int index;
0105 };
0106 
0107 /* Averaging interval */
0108 static int update_avg_interval(struct acpi_power_meter_resource *resource)
0109 {
0110     unsigned long long data;
0111     acpi_status status;
0112 
0113     status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
0114                        NULL, &data);
0115     if (ACPI_FAILURE(status)) {
0116         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI",
0117                          status);
0118         return -ENODEV;
0119     }
0120 
0121     resource->avg_interval = data;
0122     return 0;
0123 }
0124 
0125 static ssize_t show_avg_interval(struct device *dev,
0126                  struct device_attribute *devattr,
0127                  char *buf)
0128 {
0129     struct acpi_device *acpi_dev = to_acpi_device(dev);
0130     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0131 
0132     mutex_lock(&resource->lock);
0133     update_avg_interval(resource);
0134     mutex_unlock(&resource->lock);
0135 
0136     return sprintf(buf, "%llu\n", resource->avg_interval);
0137 }
0138 
0139 static ssize_t set_avg_interval(struct device *dev,
0140                 struct device_attribute *devattr,
0141                 const char *buf, size_t count)
0142 {
0143     struct acpi_device *acpi_dev = to_acpi_device(dev);
0144     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0145     union acpi_object arg0 = { ACPI_TYPE_INTEGER };
0146     struct acpi_object_list args = { 1, &arg0 };
0147     int res;
0148     unsigned long temp;
0149     unsigned long long data;
0150     acpi_status status;
0151 
0152     res = kstrtoul(buf, 10, &temp);
0153     if (res)
0154         return res;
0155 
0156     if (temp > resource->caps.max_avg_interval ||
0157         temp < resource->caps.min_avg_interval)
0158         return -EINVAL;
0159     arg0.integer.value = temp;
0160 
0161     mutex_lock(&resource->lock);
0162     status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
0163                        &args, &data);
0164     if (ACPI_SUCCESS(status))
0165         resource->avg_interval = temp;
0166     mutex_unlock(&resource->lock);
0167 
0168     if (ACPI_FAILURE(status)) {
0169         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI",
0170                          status);
0171         return -EINVAL;
0172     }
0173 
0174     /* _PAI returns 0 on success, nonzero otherwise */
0175     if (data)
0176         return -EINVAL;
0177 
0178     return count;
0179 }
0180 
0181 /* Cap functions */
0182 static int update_cap(struct acpi_power_meter_resource *resource)
0183 {
0184     unsigned long long data;
0185     acpi_status status;
0186 
0187     status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
0188                        NULL, &data);
0189     if (ACPI_FAILURE(status)) {
0190         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL",
0191                          status);
0192         return -ENODEV;
0193     }
0194 
0195     resource->cap = data;
0196     return 0;
0197 }
0198 
0199 static ssize_t show_cap(struct device *dev,
0200             struct device_attribute *devattr,
0201             char *buf)
0202 {
0203     struct acpi_device *acpi_dev = to_acpi_device(dev);
0204     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0205 
0206     mutex_lock(&resource->lock);
0207     update_cap(resource);
0208     mutex_unlock(&resource->lock);
0209 
0210     return sprintf(buf, "%llu\n", resource->cap * 1000);
0211 }
0212 
0213 static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
0214                const char *buf, size_t count)
0215 {
0216     struct acpi_device *acpi_dev = to_acpi_device(dev);
0217     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0218     union acpi_object arg0 = { ACPI_TYPE_INTEGER };
0219     struct acpi_object_list args = { 1, &arg0 };
0220     int res;
0221     unsigned long temp;
0222     unsigned long long data;
0223     acpi_status status;
0224 
0225     res = kstrtoul(buf, 10, &temp);
0226     if (res)
0227         return res;
0228 
0229     temp = DIV_ROUND_CLOSEST(temp, 1000);
0230     if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
0231         return -EINVAL;
0232     arg0.integer.value = temp;
0233 
0234     mutex_lock(&resource->lock);
0235     status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
0236                        &args, &data);
0237     if (ACPI_SUCCESS(status))
0238         resource->cap = temp;
0239     mutex_unlock(&resource->lock);
0240 
0241     if (ACPI_FAILURE(status)) {
0242         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL",
0243                          status);
0244         return -EINVAL;
0245     }
0246 
0247     /* _SHL returns 0 on success, nonzero otherwise */
0248     if (data)
0249         return -EINVAL;
0250 
0251     return count;
0252 }
0253 
0254 /* Power meter trip points */
0255 static int set_acpi_trip(struct acpi_power_meter_resource *resource)
0256 {
0257     union acpi_object arg_objs[] = {
0258         {ACPI_TYPE_INTEGER},
0259         {ACPI_TYPE_INTEGER}
0260     };
0261     struct acpi_object_list args = { 2, arg_objs };
0262     unsigned long long data;
0263     acpi_status status;
0264 
0265     /* Both trip levels must be set */
0266     if (resource->trip[0] < 0 || resource->trip[1] < 0)
0267         return 0;
0268 
0269     /* This driver stores min, max; ACPI wants max, min. */
0270     arg_objs[0].integer.value = resource->trip[1];
0271     arg_objs[1].integer.value = resource->trip[0];
0272 
0273     status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
0274                        &args, &data);
0275     if (ACPI_FAILURE(status)) {
0276         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP",
0277                          status);
0278         return -EINVAL;
0279     }
0280 
0281     /* _PTP returns 0 on success, nonzero otherwise */
0282     if (data)
0283         return -EINVAL;
0284 
0285     return 0;
0286 }
0287 
0288 static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
0289             const char *buf, size_t count)
0290 {
0291     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0292     struct acpi_device *acpi_dev = to_acpi_device(dev);
0293     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0294     int res;
0295     unsigned long temp;
0296 
0297     res = kstrtoul(buf, 10, &temp);
0298     if (res)
0299         return res;
0300 
0301     temp = DIV_ROUND_CLOSEST(temp, 1000);
0302 
0303     mutex_lock(&resource->lock);
0304     resource->trip[attr->index - 7] = temp;
0305     res = set_acpi_trip(resource);
0306     mutex_unlock(&resource->lock);
0307 
0308     if (res)
0309         return res;
0310 
0311     return count;
0312 }
0313 
0314 /* Power meter */
0315 static int update_meter(struct acpi_power_meter_resource *resource)
0316 {
0317     unsigned long long data;
0318     acpi_status status;
0319     unsigned long local_jiffies = jiffies;
0320 
0321     if (time_before(local_jiffies, resource->sensors_last_updated +
0322             msecs_to_jiffies(resource->caps.sampling_time)) &&
0323             resource->sensors_valid)
0324         return 0;
0325 
0326     status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
0327                        NULL, &data);
0328     if (ACPI_FAILURE(status)) {
0329         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM",
0330                          status);
0331         return -ENODEV;
0332     }
0333 
0334     resource->power = data;
0335     resource->sensors_valid = 1;
0336     resource->sensors_last_updated = jiffies;
0337     return 0;
0338 }
0339 
0340 static ssize_t show_power(struct device *dev,
0341               struct device_attribute *devattr,
0342               char *buf)
0343 {
0344     struct acpi_device *acpi_dev = to_acpi_device(dev);
0345     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0346 
0347     mutex_lock(&resource->lock);
0348     update_meter(resource);
0349     mutex_unlock(&resource->lock);
0350 
0351     return sprintf(buf, "%llu\n", resource->power * 1000);
0352 }
0353 
0354 /* Miscellaneous */
0355 static ssize_t show_str(struct device *dev,
0356             struct device_attribute *devattr,
0357             char *buf)
0358 {
0359     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0360     struct acpi_device *acpi_dev = to_acpi_device(dev);
0361     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0362     acpi_string val;
0363     int ret;
0364 
0365     mutex_lock(&resource->lock);
0366     switch (attr->index) {
0367     case 0:
0368         val = resource->model_number;
0369         break;
0370     case 1:
0371         val = resource->serial_number;
0372         break;
0373     case 2:
0374         val = resource->oem_info;
0375         break;
0376     default:
0377         WARN(1, "Implementation error: unexpected attribute index %d\n",
0378              attr->index);
0379         val = "";
0380         break;
0381     }
0382     ret = sprintf(buf, "%s\n", val);
0383     mutex_unlock(&resource->lock);
0384     return ret;
0385 }
0386 
0387 static ssize_t show_val(struct device *dev,
0388             struct device_attribute *devattr,
0389             char *buf)
0390 {
0391     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0392     struct acpi_device *acpi_dev = to_acpi_device(dev);
0393     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0394     u64 val = 0;
0395 
0396     switch (attr->index) {
0397     case 0:
0398         val = resource->caps.min_avg_interval;
0399         break;
0400     case 1:
0401         val = resource->caps.max_avg_interval;
0402         break;
0403     case 2:
0404         val = resource->caps.min_cap * 1000;
0405         break;
0406     case 3:
0407         val = resource->caps.max_cap * 1000;
0408         break;
0409     case 4:
0410         if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
0411             return sprintf(buf, "unknown\n");
0412 
0413         val = resource->caps.hysteresis * 1000;
0414         break;
0415     case 5:
0416         if (resource->caps.flags & POWER_METER_IS_BATTERY)
0417             val = 1;
0418         else
0419             val = 0;
0420         break;
0421     case 6:
0422         if (resource->power > resource->cap)
0423             val = 1;
0424         else
0425             val = 0;
0426         break;
0427     case 7:
0428     case 8:
0429         if (resource->trip[attr->index - 7] < 0)
0430             return sprintf(buf, "unknown\n");
0431 
0432         val = resource->trip[attr->index - 7] * 1000;
0433         break;
0434     default:
0435         WARN(1, "Implementation error: unexpected attribute index %d\n",
0436              attr->index);
0437         break;
0438     }
0439 
0440     return sprintf(buf, "%llu\n", val);
0441 }
0442 
0443 static ssize_t show_accuracy(struct device *dev,
0444                  struct device_attribute *devattr,
0445                  char *buf)
0446 {
0447     struct acpi_device *acpi_dev = to_acpi_device(dev);
0448     struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
0449     unsigned int acc = resource->caps.accuracy;
0450 
0451     return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
0452 }
0453 
0454 static ssize_t show_name(struct device *dev,
0455              struct device_attribute *devattr,
0456              char *buf)
0457 {
0458     return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
0459 }
0460 
0461 #define RO_SENSOR_TEMPLATE(_label, _show, _index)   \
0462     {                       \
0463         .label = _label,            \
0464         .show  = _show,             \
0465         .index = _index,            \
0466     }
0467 
0468 #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
0469     {                       \
0470         .label = _label,            \
0471         .show  = _show,             \
0472         .set   = _set,              \
0473         .index = _index,            \
0474     }
0475 
0476 /* Sensor descriptions.  If you add a sensor, update NUM_SENSORS above! */
0477 static struct sensor_template meter_attrs[] = {
0478     RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
0479     RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
0480     RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
0481     RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
0482     RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
0483     RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
0484                set_avg_interval, 0),
0485     {},
0486 };
0487 
0488 static struct sensor_template misc_cap_attrs[] = {
0489     RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
0490     RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
0491     RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
0492     RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
0493     {},
0494 };
0495 
0496 static struct sensor_template ro_cap_attrs[] = {
0497     RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
0498     {},
0499 };
0500 
0501 static struct sensor_template rw_cap_attrs[] = {
0502     RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
0503     {},
0504 };
0505 
0506 static struct sensor_template trip_attrs[] = {
0507     RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
0508     RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
0509     {},
0510 };
0511 
0512 static struct sensor_template misc_attrs[] = {
0513     RO_SENSOR_TEMPLATE("name", show_name, 0),
0514     RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
0515     RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
0516     RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
0517     {},
0518 };
0519 
0520 #undef RO_SENSOR_TEMPLATE
0521 #undef RW_SENSOR_TEMPLATE
0522 
0523 /* Read power domain data */
0524 static void remove_domain_devices(struct acpi_power_meter_resource *resource)
0525 {
0526     int i;
0527 
0528     if (!resource->num_domain_devices)
0529         return;
0530 
0531     for (i = 0; i < resource->num_domain_devices; i++) {
0532         struct acpi_device *obj = resource->domain_devices[i];
0533 
0534         if (!obj)
0535             continue;
0536 
0537         sysfs_remove_link(resource->holders_dir,
0538                   kobject_name(&obj->dev.kobj));
0539         acpi_dev_put(obj);
0540     }
0541 
0542     kfree(resource->domain_devices);
0543     kobject_put(resource->holders_dir);
0544     resource->num_domain_devices = 0;
0545 }
0546 
0547 static int read_domain_devices(struct acpi_power_meter_resource *resource)
0548 {
0549     int res = 0;
0550     int i;
0551     struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
0552     union acpi_object *pss;
0553     acpi_status status;
0554 
0555     status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
0556                       &buffer);
0557     if (ACPI_FAILURE(status)) {
0558         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD",
0559                          status);
0560         return -ENODEV;
0561     }
0562 
0563     pss = buffer.pointer;
0564     if (!pss ||
0565         pss->type != ACPI_TYPE_PACKAGE) {
0566         dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
0567             "Invalid _PMD data\n");
0568         res = -EFAULT;
0569         goto end;
0570     }
0571 
0572     if (!pss->package.count)
0573         goto end;
0574 
0575     resource->domain_devices = kcalloc(pss->package.count,
0576                        sizeof(struct acpi_device *),
0577                        GFP_KERNEL);
0578     if (!resource->domain_devices) {
0579         res = -ENOMEM;
0580         goto end;
0581     }
0582 
0583     resource->holders_dir = kobject_create_and_add("measures",
0584                                &resource->acpi_dev->dev.kobj);
0585     if (!resource->holders_dir) {
0586         res = -ENOMEM;
0587         goto exit_free;
0588     }
0589 
0590     resource->num_domain_devices = pss->package.count;
0591 
0592     for (i = 0; i < pss->package.count; i++) {
0593         struct acpi_device *obj;
0594         union acpi_object *element = &pss->package.elements[i];
0595 
0596         /* Refuse non-references */
0597         if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
0598             continue;
0599 
0600         /* Create a symlink to domain objects */
0601         obj = acpi_bus_get_acpi_device(element->reference.handle);
0602         resource->domain_devices[i] = obj;
0603         if (!obj)
0604             continue;
0605 
0606         res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
0607                     kobject_name(&obj->dev.kobj));
0608         if (res) {
0609             acpi_dev_put(obj);
0610             resource->domain_devices[i] = NULL;
0611         }
0612     }
0613 
0614     res = 0;
0615     goto end;
0616 
0617 exit_free:
0618     kfree(resource->domain_devices);
0619 end:
0620     kfree(buffer.pointer);
0621     return res;
0622 }
0623 
0624 /* Registration and deregistration */
0625 static int register_attrs(struct acpi_power_meter_resource *resource,
0626               struct sensor_template *attrs)
0627 {
0628     struct device *dev = &resource->acpi_dev->dev;
0629     struct sensor_device_attribute *sensors =
0630         &resource->sensors[resource->num_sensors];
0631     int res = 0;
0632 
0633     while (attrs->label) {
0634         sensors->dev_attr.attr.name = attrs->label;
0635         sensors->dev_attr.attr.mode = 0444;
0636         sensors->dev_attr.show = attrs->show;
0637         sensors->index = attrs->index;
0638 
0639         if (attrs->set) {
0640             sensors->dev_attr.attr.mode |= 0200;
0641             sensors->dev_attr.store = attrs->set;
0642         }
0643 
0644         sysfs_attr_init(&sensors->dev_attr.attr);
0645         res = device_create_file(dev, &sensors->dev_attr);
0646         if (res) {
0647             sensors->dev_attr.attr.name = NULL;
0648             goto error;
0649         }
0650         sensors++;
0651         resource->num_sensors++;
0652         attrs++;
0653     }
0654 
0655 error:
0656     return res;
0657 }
0658 
0659 static void remove_attrs(struct acpi_power_meter_resource *resource)
0660 {
0661     int i;
0662 
0663     for (i = 0; i < resource->num_sensors; i++) {
0664         if (!resource->sensors[i].dev_attr.attr.name)
0665             continue;
0666         device_remove_file(&resource->acpi_dev->dev,
0667                    &resource->sensors[i].dev_attr);
0668     }
0669 
0670     remove_domain_devices(resource);
0671 
0672     resource->num_sensors = 0;
0673 }
0674 
0675 static int setup_attrs(struct acpi_power_meter_resource *resource)
0676 {
0677     int res = 0;
0678 
0679     res = read_domain_devices(resource);
0680     if (res)
0681         return res;
0682 
0683     if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
0684         res = register_attrs(resource, meter_attrs);
0685         if (res)
0686             goto error;
0687     }
0688 
0689     if (resource->caps.flags & POWER_METER_CAN_CAP) {
0690         if (!can_cap_in_hardware()) {
0691             dev_warn(&resource->acpi_dev->dev,
0692                  "Ignoring unsafe software power cap!\n");
0693             goto skip_unsafe_cap;
0694         }
0695 
0696         if (resource->caps.configurable_cap)
0697             res = register_attrs(resource, rw_cap_attrs);
0698         else
0699             res = register_attrs(resource, ro_cap_attrs);
0700 
0701         if (res)
0702             goto error;
0703 
0704         res = register_attrs(resource, misc_cap_attrs);
0705         if (res)
0706             goto error;
0707     }
0708 
0709 skip_unsafe_cap:
0710     if (resource->caps.flags & POWER_METER_CAN_TRIP) {
0711         res = register_attrs(resource, trip_attrs);
0712         if (res)
0713             goto error;
0714     }
0715 
0716     res = register_attrs(resource, misc_attrs);
0717     if (res)
0718         goto error;
0719 
0720     return res;
0721 error:
0722     remove_attrs(resource);
0723     return res;
0724 }
0725 
0726 static void free_capabilities(struct acpi_power_meter_resource *resource)
0727 {
0728     acpi_string *str;
0729     int i;
0730 
0731     str = &resource->model_number;
0732     for (i = 0; i < 3; i++, str++) {
0733         kfree(*str);
0734         *str = NULL;
0735     }
0736 }
0737 
0738 static int read_capabilities(struct acpi_power_meter_resource *resource)
0739 {
0740     int res = 0;
0741     int i;
0742     struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
0743     struct acpi_buffer state = { 0, NULL };
0744     struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
0745     union acpi_object *pss;
0746     acpi_string *str;
0747     acpi_status status;
0748 
0749     status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
0750                       &buffer);
0751     if (ACPI_FAILURE(status)) {
0752         acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC",
0753                          status);
0754         return -ENODEV;
0755     }
0756 
0757     pss = buffer.pointer;
0758     if (!pss ||
0759         pss->type != ACPI_TYPE_PACKAGE ||
0760         pss->package.count != 14) {
0761         dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
0762             "Invalid _PMC data\n");
0763         res = -EFAULT;
0764         goto end;
0765     }
0766 
0767     /* Grab all the integer data at once */
0768     state.length = sizeof(struct acpi_power_meter_capabilities);
0769     state.pointer = &resource->caps;
0770 
0771     status = acpi_extract_package(pss, &format, &state);
0772     if (ACPI_FAILURE(status)) {
0773         dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
0774             "_PMC package parsing failed: %s\n",
0775             acpi_format_exception(status));
0776         res = -EFAULT;
0777         goto end;
0778     }
0779 
0780     if (resource->caps.units) {
0781         dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
0782             "Unknown units %llu.\n",
0783             resource->caps.units);
0784         res = -EINVAL;
0785         goto end;
0786     }
0787 
0788     /* Grab the string data */
0789     str = &resource->model_number;
0790 
0791     for (i = 11; i < 14; i++) {
0792         union acpi_object *element = &pss->package.elements[i];
0793 
0794         if (element->type != ACPI_TYPE_STRING) {
0795             res = -EINVAL;
0796             goto error;
0797         }
0798 
0799         *str = kcalloc(element->string.length + 1, sizeof(u8),
0800                    GFP_KERNEL);
0801         if (!*str) {
0802             res = -ENOMEM;
0803             goto error;
0804         }
0805 
0806         strncpy(*str, element->string.pointer, element->string.length);
0807         str++;
0808     }
0809 
0810     dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
0811     goto end;
0812 error:
0813     free_capabilities(resource);
0814 end:
0815     kfree(buffer.pointer);
0816     return res;
0817 }
0818 
0819 /* Handle ACPI event notifications */
0820 static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
0821 {
0822     struct acpi_power_meter_resource *resource;
0823     int res;
0824 
0825     if (!device || !acpi_driver_data(device))
0826         return;
0827 
0828     resource = acpi_driver_data(device);
0829 
0830     switch (event) {
0831     case METER_NOTIFY_CONFIG:
0832         mutex_lock(&resource->lock);
0833         free_capabilities(resource);
0834         res = read_capabilities(resource);
0835         mutex_unlock(&resource->lock);
0836         if (res)
0837             break;
0838 
0839         remove_attrs(resource);
0840         setup_attrs(resource);
0841         break;
0842     case METER_NOTIFY_TRIP:
0843         sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
0844         break;
0845     case METER_NOTIFY_CAP:
0846         sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
0847         break;
0848     case METER_NOTIFY_INTERVAL:
0849         sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
0850         break;
0851     case METER_NOTIFY_CAPPING:
0852         sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
0853         dev_info(&device->dev, "Capping in progress.\n");
0854         break;
0855     default:
0856         WARN(1, "Unexpected event %d\n", event);
0857         break;
0858     }
0859 
0860     acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
0861                     dev_name(&device->dev), event, 0);
0862 }
0863 
0864 static int acpi_power_meter_add(struct acpi_device *device)
0865 {
0866     int res;
0867     struct acpi_power_meter_resource *resource;
0868 
0869     if (!device)
0870         return -EINVAL;
0871 
0872     resource = kzalloc(sizeof(*resource), GFP_KERNEL);
0873     if (!resource)
0874         return -ENOMEM;
0875 
0876     resource->sensors_valid = 0;
0877     resource->acpi_dev = device;
0878     mutex_init(&resource->lock);
0879     strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
0880     strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
0881     device->driver_data = resource;
0882 
0883     res = read_capabilities(resource);
0884     if (res)
0885         goto exit_free;
0886 
0887     resource->trip[0] = -1;
0888     resource->trip[1] = -1;
0889 
0890     res = setup_attrs(resource);
0891     if (res)
0892         goto exit_free_capability;
0893 
0894     resource->hwmon_dev = hwmon_device_register(&device->dev);
0895     if (IS_ERR(resource->hwmon_dev)) {
0896         res = PTR_ERR(resource->hwmon_dev);
0897         goto exit_remove;
0898     }
0899 
0900     res = 0;
0901     goto exit;
0902 
0903 exit_remove:
0904     remove_attrs(resource);
0905 exit_free_capability:
0906     free_capabilities(resource);
0907 exit_free:
0908     kfree(resource);
0909 exit:
0910     return res;
0911 }
0912 
0913 static int acpi_power_meter_remove(struct acpi_device *device)
0914 {
0915     struct acpi_power_meter_resource *resource;
0916 
0917     if (!device || !acpi_driver_data(device))
0918         return -EINVAL;
0919 
0920     resource = acpi_driver_data(device);
0921     hwmon_device_unregister(resource->hwmon_dev);
0922 
0923     remove_attrs(resource);
0924     free_capabilities(resource);
0925 
0926     kfree(resource);
0927     return 0;
0928 }
0929 
0930 #ifdef CONFIG_PM_SLEEP
0931 
0932 static int acpi_power_meter_resume(struct device *dev)
0933 {
0934     struct acpi_power_meter_resource *resource;
0935 
0936     if (!dev)
0937         return -EINVAL;
0938 
0939     resource = acpi_driver_data(to_acpi_device(dev));
0940     if (!resource)
0941         return -EINVAL;
0942 
0943     free_capabilities(resource);
0944     read_capabilities(resource);
0945 
0946     return 0;
0947 }
0948 
0949 #endif /* CONFIG_PM_SLEEP */
0950 
0951 static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume);
0952 
0953 static struct acpi_driver acpi_power_meter_driver = {
0954     .name = "power_meter",
0955     .class = ACPI_POWER_METER_CLASS,
0956     .ids = power_meter_ids,
0957     .ops = {
0958         .add = acpi_power_meter_add,
0959         .remove = acpi_power_meter_remove,
0960         .notify = acpi_power_meter_notify,
0961         },
0962     .drv.pm = &acpi_power_meter_pm,
0963 };
0964 
0965 /* Module init/exit routines */
0966 static int __init enable_cap_knobs(const struct dmi_system_id *d)
0967 {
0968     cap_in_hardware = 1;
0969     return 0;
0970 }
0971 
0972 static const struct dmi_system_id pm_dmi_table[] __initconst = {
0973     {
0974         enable_cap_knobs, "IBM Active Energy Manager",
0975         {
0976             DMI_MATCH(DMI_SYS_VENDOR, "IBM")
0977         },
0978     },
0979     {}
0980 };
0981 
0982 static int __init acpi_power_meter_init(void)
0983 {
0984     int result;
0985 
0986     if (acpi_disabled)
0987         return -ENODEV;
0988 
0989     dmi_check_system(pm_dmi_table);
0990 
0991     result = acpi_bus_register_driver(&acpi_power_meter_driver);
0992     if (result < 0)
0993         return result;
0994 
0995     return 0;
0996 }
0997 
0998 static void __exit acpi_power_meter_exit(void)
0999 {
1000     acpi_bus_unregister_driver(&acpi_power_meter_driver);
1001 }
1002 
1003 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
1004 MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
1005 MODULE_LICENSE("GPL");
1006 
1007 module_param(force_cap_on, bool, 0644);
1008 MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
1009 
1010 module_init(acpi_power_meter_init);
1011 module_exit(acpi_power_meter_exit);
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