Move ACPI power meter driver to hwmon
As discussed earlier, the ACPI power meter driver would better live
in drivers/hwmon, as its only purpose is to create hwmon-style
interfaces for ACPI 4.0 power meter devices. Users are more likely to
look for it there, and less likely to accidentally hide it by
unselecting its dependencies.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: "Darrick J. Wong" <djwong@us.ibm.com>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Len Brown <lenb@kernel.org>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a620a76..12bfc07 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1351,6 +1351,16 @@
comment "ACPI drivers"
+config SENSORS_ACPI_POWER
+ tristate "ACPI 4.0 power meter"
+ help
+ This driver exposes ACPI 4.0 power meters as hardware monitoring
+ devices. Say Y (or M) if you have a computer with ACPI 4.0 firmware
+ and a power meter.
+
+ To compile this driver as a module, choose M here:
+ the module will be called acpi_power_meter.
+
config SENSORS_ATK0110
tristate "ASUS ATK0110"
depends on X86 && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 8524db2..8a57eca 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -6,6 +6,7 @@
obj-$(CONFIG_HWMON_VID) += hwmon-vid.o
# APCI drivers
+obj-$(CONFIG_SENSORS_ACPI_POWER) += acpi_power_meter.o
obj-$(CONFIG_SENSORS_ATK0110) += asus_atk0110.o
# Native drivers
diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
new file mode 100644
index 0000000..66f6729
--- /dev/null
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -0,0 +1,1023 @@
+/*
+ * A hwmon driver for ACPI 4.0 power meters
+ * Copyright (C) 2009 IBM
+ *
+ * Author: Darrick J. Wong <djwong@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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 <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+
+#define ACPI_POWER_METER_NAME "power_meter"
+ACPI_MODULE_NAME(ACPI_POWER_METER_NAME);
+#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 int 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;
+ int trip[2];
+ int num_domain_devices;
+ struct acpi_device **domain_devices;
+ struct kobject *holders_dir;
+};
+
+struct ro_sensor_template {
+ char *label;
+ ssize_t (*show)(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf);
+ int index;
+};
+
+struct rw_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_EXCEPTION((AE_INFO, status, "Evaluating _GAI"));
+ 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 = strict_strtoul(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_FAILURE(status))
+ resource->avg_interval = temp;
+ mutex_unlock(&resource->lock);
+
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
+ 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_EXCEPTION((AE_INFO, status, "Evaluating _GHL"));
+ 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 = strict_strtoul(buf, 10, &temp);
+ if (res)
+ return res;
+
+ 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_FAILURE(status))
+ resource->cap = temp;
+ mutex_unlock(&resource->lock);
+
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
+ 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_EXCEPTION((AE_INFO, status, "Evaluating _PTP"));
+ 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 = strict_strtoul(buf, 10, &temp);
+ if (res)
+ return res;
+
+ temp /= 1000;
+ if (temp < 0)
+ return -EINVAL;
+
+ 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_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
+ 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;
+
+ 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:
+ BUG();
+ }
+
+ return sprintf(buf, "%s\n", val);
+}
+
+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:
+ BUG();
+ }
+
+ 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);
+}
+
+/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
+static struct ro_sensor_template meter_ro_attrs[] = {
+{POWER_AVERAGE_NAME, show_power, 0},
+{"power1_accuracy", show_accuracy, 0},
+{"power1_average_interval_min", show_val, 0},
+{"power1_average_interval_max", show_val, 1},
+{"power1_is_battery", show_val, 5},
+{NULL, NULL, 0},
+};
+
+static struct rw_sensor_template meter_rw_attrs[] = {
+{POWER_AVG_INTERVAL_NAME, show_avg_interval, set_avg_interval, 0},
+{NULL, NULL, NULL, 0},
+};
+
+static struct ro_sensor_template misc_cap_attrs[] = {
+{"power1_cap_min", show_val, 2},
+{"power1_cap_max", show_val, 3},
+{"power1_cap_hyst", show_val, 4},
+{POWER_ALARM_NAME, show_val, 6},
+{NULL, NULL, 0},
+};
+
+static struct ro_sensor_template ro_cap_attrs[] = {
+{POWER_CAP_NAME, show_cap, 0},
+{NULL, NULL, 0},
+};
+
+static struct rw_sensor_template rw_cap_attrs[] = {
+{POWER_CAP_NAME, show_cap, set_cap, 0},
+{NULL, NULL, NULL, 0},
+};
+
+static struct rw_sensor_template trip_attrs[] = {
+{"power1_average_min", show_val, set_trip, 7},
+{"power1_average_max", show_val, set_trip, 8},
+{NULL, NULL, NULL, 0},
+};
+
+static struct ro_sensor_template misc_attrs[] = {
+{"name", show_name, 0},
+{"power1_model_number", show_str, 0},
+{"power1_oem_info", show_str, 2},
+{"power1_serial_number", show_str, 1},
+{NULL, NULL, 0},
+};
+
+/* 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));
+ put_device(&obj->dev);
+ }
+
+ 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_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
+ return -ENODEV;
+ }
+
+ pss = buffer.pointer;
+ if (!pss ||
+ pss->type != ACPI_TYPE_PACKAGE) {
+ dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
+ "Invalid _PMD data\n");
+ res = -EFAULT;
+ goto end;
+ }
+
+ if (!pss->package.count)
+ goto end;
+
+ resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
+ pss->package.count, 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;
+ status = acpi_bus_get_device(element->reference.handle,
+ &resource->domain_devices[i]);
+ if (ACPI_FAILURE(status))
+ 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_ro_attrs(struct acpi_power_meter_resource *resource,
+ struct ro_sensor_template *ro)
+{
+ struct device *dev = &resource->acpi_dev->dev;
+ struct sensor_device_attribute *sensors =
+ &resource->sensors[resource->num_sensors];
+ int res = 0;
+
+ while (ro->label) {
+ sensors->dev_attr.attr.name = ro->label;
+ sensors->dev_attr.attr.mode = S_IRUGO;
+ sensors->dev_attr.show = ro->show;
+ sensors->index = ro->index;
+
+ res = device_create_file(dev, &sensors->dev_attr);
+ if (res) {
+ sensors->dev_attr.attr.name = NULL;
+ goto error;
+ }
+ sensors++;
+ resource->num_sensors++;
+ ro++;
+ }
+
+error:
+ return res;
+}
+
+static int register_rw_attrs(struct acpi_power_meter_resource *resource,
+ struct rw_sensor_template *rw)
+{
+ struct device *dev = &resource->acpi_dev->dev;
+ struct sensor_device_attribute *sensors =
+ &resource->sensors[resource->num_sensors];
+ int res = 0;
+
+ while (rw->label) {
+ sensors->dev_attr.attr.name = rw->label;
+ sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
+ sensors->dev_attr.show = rw->show;
+ sensors->dev_attr.store = rw->set;
+ sensors->index = rw->index;
+
+ res = device_create_file(dev, &sensors->dev_attr);
+ if (res) {
+ sensors->dev_attr.attr.name = NULL;
+ goto error;
+ }
+ sensors++;
+ resource->num_sensors++;
+ rw++;
+ }
+
+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_ro_attrs(resource, meter_ro_attrs);
+ if (res)
+ goto error;
+ res = register_rw_attrs(resource, meter_rw_attrs);
+ if (res)
+ goto error;
+ }
+
+ if (resource->caps.flags & POWER_METER_CAN_CAP) {
+ if (!can_cap_in_hardware()) {
+ dev_err(&resource->acpi_dev->dev,
+ "Ignoring unsafe software power cap!\n");
+ goto skip_unsafe_cap;
+ }
+
+ if (resource->caps.configurable_cap) {
+ res = register_rw_attrs(resource, rw_cap_attrs);
+ if (res)
+ goto error;
+ } else {
+ res = register_ro_attrs(resource, ro_cap_attrs);
+ if (res)
+ goto error;
+ }
+ res = register_ro_attrs(resource, misc_cap_attrs);
+ if (res)
+ goto error;
+ }
+skip_unsafe_cap:
+
+ if (resource->caps.flags & POWER_METER_CAN_TRIP) {
+ res = register_rw_attrs(resource, trip_attrs);
+ if (res)
+ goto error;
+ }
+
+ res = register_ro_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);
+}
+
+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_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
+ 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)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
+ 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 = kzalloc(sizeof(u8) * (element->string.length + 1),
+ 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:
+ str = &resource->model_number;
+ for (i = 0; i < 3; i++, str++)
+ kfree(*str);
+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);
+
+ mutex_lock(&resource->lock);
+ switch (event) {
+ case METER_NOTIFY_CONFIG:
+ free_capabilities(resource);
+ res = read_capabilities(resource);
+ if (res)
+ break;
+
+ remove_attrs(resource);
+ setup_attrs(resource);
+ break;
+ case METER_NOTIFY_TRIP:
+ sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
+ update_meter(resource);
+ break;
+ case METER_NOTIFY_CAP:
+ sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
+ update_cap(resource);
+ break;
+ case METER_NOTIFY_INTERVAL:
+ sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
+ update_avg_interval(resource);
+ break;
+ case METER_NOTIFY_CAPPING:
+ sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
+ dev_info(&device->dev, "Capping in progress.\n");
+ break;
+ default:
+ BUG();
+ }
+ mutex_unlock(&resource->lock);
+
+ 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;
+
+ free_capabilities(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;
+
+ 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:
+ kfree(resource);
+exit:
+ return res;
+}
+
+static int acpi_power_meter_remove(struct acpi_device *device, int type)
+{
+ 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);
+
+ free_capabilities(resource);
+ remove_attrs(resource);
+
+ kfree(resource);
+ return 0;
+}
+
+static int acpi_power_meter_resume(struct acpi_device *device)
+{
+ struct acpi_power_meter_resource *resource;
+
+ if (!device || !acpi_driver_data(device))
+ return -EINVAL;
+
+ resource = acpi_driver_data(device);
+ free_capabilities(resource);
+ read_capabilities(resource);
+
+ return 0;
+}
+
+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,
+ .resume = acpi_power_meter_resume,
+ .notify = acpi_power_meter_notify,
+ },
+};
+
+/* Module init/exit routines */
+static int __init enable_cap_knobs(const struct dmi_system_id *d)
+{
+ cap_in_hardware = 1;
+ return 0;
+}
+
+static struct dmi_system_id __initdata pm_dmi_table[] = {
+ {
+ 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 -ENODEV;
+
+ return 0;
+}
+
+static void __exit acpi_power_meter_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_power_meter_driver);
+}
+
+MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.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);