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ibmaem.c
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/*
* A hwmon driver for the IBM System Director Active Energy Manager (AEM)
* temperature/power/energy sensors and capping functionality.
* Copyright (C) 2008 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
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/ipmi.h>
#include <linux/module.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/kdev_t.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/math64.h>
#include <linux/time.h>
#define REFRESH_INTERVAL (HZ)
#define IPMI_TIMEOUT (30 * HZ)
#define DRVNAME "aem"
#define AEM_NETFN 0x2E
#define AEM_FIND_FW_CMD 0x80
#define AEM_ELEMENT_CMD 0x81
#define AEM_FW_INSTANCE_CMD 0x82
#define AEM_READ_ELEMENT_CFG 0x80
#define AEM_READ_BUFFER 0x81
#define AEM_READ_REGISTER 0x82
#define AEM_WRITE_REGISTER 0x83
#define AEM_SET_REG_MASK 0x84
#define AEM_CLEAR_REG_MASK 0x85
#define AEM_READ_ELEMENT_CFG2 0x86
#define AEM_CONTROL_ELEMENT 0
#define AEM_ENERGY_ELEMENT 1
#define AEM_CLOCK_ELEMENT 4
#define AEM_POWER_CAP_ELEMENT 7
#define AEM_EXHAUST_ELEMENT 9
#define AEM_POWER_ELEMENT 10
#define AEM_MODULE_TYPE_ID 0x0001
#define AEM2_NUM_ENERGY_REGS 2
#define AEM2_NUM_PCAP_REGS 6
#define AEM2_NUM_TEMP_REGS 2
#define AEM2_NUM_SENSORS 14
#define AEM1_NUM_ENERGY_REGS 1
#define AEM1_NUM_SENSORS 3
/* AEM 2.x has more energy registers */
#define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS
/* AEM 2.x needs more sensor files */
#define AEM_NUM_SENSORS AEM2_NUM_SENSORS
#define POWER_CAP 0
#define POWER_CAP_MAX_HOTPLUG 1
#define POWER_CAP_MAX 2
#define POWER_CAP_MIN_WARNING 3
#define POWER_CAP_MIN 4
#define POWER_AUX 5
#define AEM_DEFAULT_POWER_INTERVAL 1000
#define AEM_MIN_POWER_INTERVAL 200
#define UJ_PER_MJ 1000L
static DEFINE_IDR(aem_idr);
static DEFINE_SPINLOCK(aem_idr_lock);
static struct platform_driver aem_driver = {
.driver = {
.name = DRVNAME,
.bus = &platform_bus_type,
}
};
struct aem_ipmi_data {
struct completion read_complete;
struct ipmi_addr address;
ipmi_user_t user;
int interface;
struct kernel_ipmi_msg tx_message;
long tx_msgid;
void *rx_msg_data;
unsigned short rx_msg_len;
unsigned char rx_result;
int rx_recv_type;
struct device *bmc_device;
};
struct aem_ro_sensor_template {
char *label;
ssize_t (*show)(struct device *dev,
struct device_attribute *devattr,
char *buf);
int index;
};
struct aem_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;
};
struct aem_data {
struct list_head list;
struct device *hwmon_dev;
struct platform_device *pdev;
struct mutex lock;
char valid;
unsigned long last_updated; /* In jiffies */
u8 ver_major;
u8 ver_minor;
u8 module_handle;
int id;
struct aem_ipmi_data ipmi;
/* Function to update sensors */
void (*update)(struct aem_data *data);
/*
* AEM 1.x sensors:
* Available sensors:
* Energy meter
* Power meter
*
* AEM 2.x sensors:
* Two energy meters
* Two power meters
* Two temperature sensors
* Six power cap registers
*/
/* sysfs attrs */
struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
/* energy use in mJ */
u64 energy[AEM_NUM_ENERGY_REGS];
/* power sampling interval in ms */
unsigned long power_period[AEM_NUM_ENERGY_REGS];
/* Everything past here is for AEM2 only */
/* power caps in dW */
u16 pcap[AEM2_NUM_PCAP_REGS];
/* exhaust temperature in C */
u8 temp[AEM2_NUM_TEMP_REGS];
};
/* Data structures returned by the AEM firmware */
struct aem_iana_id {
u8 bytes[3];
};
static struct aem_iana_id system_x_id = {
.bytes = {0x4D, 0x4F, 0x00}
};
/* These are used to find AEM1 instances */
struct aem_find_firmware_req {
struct aem_iana_id id;
u8 rsvd;
__be16 index;
__be16 module_type_id;
} __packed;
struct aem_find_firmware_resp {
struct aem_iana_id id;
u8 num_instances;
} __packed;
/* These are used to find AEM2 instances */
struct aem_find_instance_req {
struct aem_iana_id id;
u8 instance_number;
__be16 module_type_id;
} __packed;
struct aem_find_instance_resp {
struct aem_iana_id id;
u8 num_instances;
u8 major;
u8 minor;
u8 module_handle;
u16 record_id;
} __packed;
/* These are used to query sensors */
struct aem_read_sensor_req {
struct aem_iana_id id;
u8 module_handle;
u8 element;
u8 subcommand;
u8 reg;
u8 rx_buf_size;
} __packed;
struct aem_read_sensor_resp {
struct aem_iana_id id;
u8 bytes[0];
} __packed;
/* Data structures to talk to the IPMI layer */
struct aem_driver_data {
struct list_head aem_devices;
struct ipmi_smi_watcher bmc_events;
struct ipmi_user_hndl ipmi_hndlrs;
};
static void aem_register_bmc(int iface, struct device *dev);
static void aem_bmc_gone(int iface);
static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
static void aem_remove_sensors(struct aem_data *data);
static int aem_init_aem1(struct aem_ipmi_data *probe);
static int aem_init_aem2(struct aem_ipmi_data *probe);
static int aem1_find_sensors(struct aem_data *data);
static int aem2_find_sensors(struct aem_data *data);
static void update_aem1_sensors(struct aem_data *data);
static void update_aem2_sensors(struct aem_data *data);
static struct aem_driver_data driver_data = {
.aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
.bmc_events = {
.owner = THIS_MODULE,
.new_smi = aem_register_bmc,
.smi_gone = aem_bmc_gone,
},
.ipmi_hndlrs = {
.ipmi_recv_hndl = aem_msg_handler,
},
};
/* Functions to talk to the IPMI layer */
/* Initialize IPMI address, message buffers and user data */
static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
struct device *bmc)
{
int err;
init_completion(&data->read_complete);
data->bmc_device = bmc;
/* Initialize IPMI address */
data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
data->address.channel = IPMI_BMC_CHANNEL;
data->address.data[0] = 0;
data->interface = iface;
/* Initialize message buffers */
data->tx_msgid = 0;
data->tx_message.netfn = AEM_NETFN;
/* Create IPMI messaging interface user */
err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
data, &data->user);
if (err < 0) {
dev_err(bmc, "Unable to register user with IPMI "
"interface %d\n", data->interface);
return -EACCES;
}
return 0;
}
/* Send an IPMI command */
static int aem_send_message(struct aem_ipmi_data *data)
{
int err;
err = ipmi_validate_addr(&data->address, sizeof(data->address));
if (err)
goto out;
data->tx_msgid++;
err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
&data->tx_message, data, 0, 0, 0);
if (err)
goto out1;
return 0;
out1:
dev_err(data->bmc_device, "request_settime=%x\n", err);
return err;
out:
dev_err(data->bmc_device, "validate_addr=%x\n", err);
return err;
}
/* Dispatch IPMI messages to callers */
static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
{
unsigned short rx_len;
struct aem_ipmi_data *data = user_msg_data;
if (msg->msgid != data->tx_msgid) {
dev_err(data->bmc_device, "Mismatch between received msgid "
"(%02x) and transmitted msgid (%02x)!\n",
(int)msg->msgid,
(int)data->tx_msgid);
ipmi_free_recv_msg(msg);
return;
}
data->rx_recv_type = msg->recv_type;
if (msg->msg.data_len > 0)
data->rx_result = msg->msg.data[0];
else
data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
if (msg->msg.data_len > 1) {
rx_len = msg->msg.data_len - 1;
if (data->rx_msg_len < rx_len)
rx_len = data->rx_msg_len;
data->rx_msg_len = rx_len;
memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
} else
data->rx_msg_len = 0;
ipmi_free_recv_msg(msg);
complete(&data->read_complete);
}
/* ID functions */
/* Obtain an id */
static int aem_idr_get(int *id)
{
int i, err;
again:
if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL)))
return -ENOMEM;
spin_lock(&aem_idr_lock);
err = idr_get_new(&aem_idr, NULL, &i);
spin_unlock(&aem_idr_lock);
if (unlikely(err == -EAGAIN))
goto again;
else if (unlikely(err))
return err;
*id = i & MAX_ID_MASK;
return 0;
}
/* Release an object ID */
static void aem_idr_put(int id)
{
spin_lock(&aem_idr_lock);
idr_remove(&aem_idr, id);
spin_unlock(&aem_idr_lock);
}
/* Sensor support functions */
/* Read a sensor value */
static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
void *buf, size_t size)
{
int rs_size, res;
struct aem_read_sensor_req rs_req;
struct aem_read_sensor_resp *rs_resp;
struct aem_ipmi_data *ipmi = &data->ipmi;
/* AEM registers are 1, 2, 4 or 8 bytes */
switch (size) {
case 1:
case 2:
case 4:
case 8:
break;
default:
return -EINVAL;
}
rs_req.id = system_x_id;
rs_req.module_handle = data->module_handle;
rs_req.element = elt;
rs_req.subcommand = AEM_READ_REGISTER;
rs_req.reg = reg;
rs_req.rx_buf_size = size;
ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
ipmi->tx_message.data = (char *)&rs_req;
ipmi->tx_message.data_len = sizeof(rs_req);
rs_size = sizeof(*rs_resp) + size;
rs_resp = kzalloc(rs_size, GFP_KERNEL);
if (!rs_resp)
return -ENOMEM;
ipmi->rx_msg_data = rs_resp;
ipmi->rx_msg_len = rs_size;
aem_send_message(ipmi);
res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
if (!res)
return -ETIMEDOUT;
if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
kfree(rs_resp);
return -ENOENT;
}
switch (size) {
case 1: {
u8 *x = buf;
*x = rs_resp->bytes[0];
break;
}
case 2: {
u16 *x = buf;
*x = be16_to_cpup((__be16 *)rs_resp->bytes);
break;
}
case 4: {
u32 *x = buf;
*x = be32_to_cpup((__be32 *)rs_resp->bytes);
break;
}
case 8: {
u64 *x = buf;
*x = be64_to_cpup((__be64 *)rs_resp->bytes);
break;
}
}
return 0;
}
/* Update AEM energy registers */
static void update_aem_energy_one(struct aem_data *data, int which)
{
aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
&data->energy[which], 8);
}
static void update_aem_energy(struct aem_data *data)
{
update_aem_energy_one(data, 0);
if (data->ver_major < 2)
return;
update_aem_energy_one(data, 1);
}
/* Update all AEM1 sensors */
static void update_aem1_sensors(struct aem_data *data)
{
mutex_lock(&data->lock);
if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
data->valid)
goto out;
update_aem_energy(data);
out:
mutex_unlock(&data->lock);
}
/* Update all AEM2 sensors */
static void update_aem2_sensors(struct aem_data *data)
{
int i;
mutex_lock(&data->lock);
if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
data->valid)
goto out;
update_aem_energy(data);
aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
for (i = POWER_CAP; i <= POWER_AUX; i++)
aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
&data->pcap[i], 2);
out:
mutex_unlock(&data->lock);
}
/* Delete an AEM instance */
static void aem_delete(struct aem_data *data)
{
list_del(&data->list);
aem_remove_sensors(data);
hwmon_device_unregister(data->hwmon_dev);
ipmi_destroy_user(data->ipmi.user);
dev_set_drvdata(&data->pdev->dev, NULL);
platform_device_unregister(data->pdev);
aem_idr_put(data->id);
kfree(data);
}
/* Probe functions for AEM1 devices */
/* Retrieve version and module handle for an AEM1 instance */
static int aem_find_aem1_count(struct aem_ipmi_data *data)
{
int res;
struct aem_find_firmware_req ff_req;
struct aem_find_firmware_resp ff_resp;
ff_req.id = system_x_id;
ff_req.index = 0;
ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
data->tx_message.cmd = AEM_FIND_FW_CMD;
data->tx_message.data = (char *)&ff_req;
data->tx_message.data_len = sizeof(ff_req);
data->rx_msg_data = &ff_resp;
data->rx_msg_len = sizeof(ff_resp);
aem_send_message(data);
res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
if (!res)
return -ETIMEDOUT;
if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
return -ENOENT;
return ff_resp.num_instances;
}
/* Find and initialize one AEM1 instance */
static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
{
struct aem_data *data;
int i;
int res = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return res;
mutex_init(&data->lock);
/* Copy instance data */
data->ver_major = 1;
data->ver_minor = 0;
data->module_handle = module_handle;
for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
/* Create sub-device for this fw instance */
if (aem_idr_get(&data->id))
goto id_err;
data->pdev = platform_device_alloc(DRVNAME, data->id);
if (!data->pdev)
goto dev_err;
data->pdev->dev.driver = &aem_driver.driver;
res = platform_device_add(data->pdev);
if (res)
goto ipmi_err;
dev_set_drvdata(&data->pdev->dev, data);
/* Set up IPMI interface */
if (aem_init_ipmi_data(&data->ipmi, probe->interface,
probe->bmc_device))
goto ipmi_err;
/* Register with hwmon */
data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
dev_err(&data->pdev->dev, "Unable to register hwmon "
"device for IPMI interface %d\n",
probe->interface);
goto hwmon_reg_err;
}
data->update = update_aem1_sensors;
/* Find sensors */
if (aem1_find_sensors(data))
goto sensor_err;
/* Add to our list of AEM devices */
list_add_tail(&data->list, &driver_data.aem_devices);
dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
data->ver_major, data->ver_minor,
data->module_handle);
return 0;
sensor_err:
hwmon_device_unregister(data->hwmon_dev);
hwmon_reg_err:
ipmi_destroy_user(data->ipmi.user);
ipmi_err:
dev_set_drvdata(&data->pdev->dev, NULL);
platform_device_unregister(data->pdev);
dev_err:
aem_idr_put(data->id);
id_err:
kfree(data);
return res;
}
/* Find and initialize all AEM1 instances */
static int aem_init_aem1(struct aem_ipmi_data *probe)
{
int num, i, err;
num = aem_find_aem1_count(probe);
for (i = 0; i < num; i++) {
err = aem_init_aem1_inst(probe, i);
if (err) {
dev_err(probe->bmc_device,
"Error %d initializing AEM1 0x%X\n",
err, i);
return err;
}
}
return 0;
}
/* Probe functions for AEM2 devices */
/* Retrieve version and module handle for an AEM2 instance */
static int aem_find_aem2(struct aem_ipmi_data *data,
struct aem_find_instance_resp *fi_resp,
int instance_num)
{
int res;
struct aem_find_instance_req fi_req;
fi_req.id = system_x_id;
fi_req.instance_number = instance_num;
fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
data->tx_message.data = (char *)&fi_req;
data->tx_message.data_len = sizeof(fi_req);
data->rx_msg_data = fi_resp;
data->rx_msg_len = sizeof(*fi_resp);
aem_send_message(data);
res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
if (!res)
return -ETIMEDOUT;
if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
fi_resp->num_instances <= instance_num)
return -ENOENT;
return 0;
}
/* Find and initialize one AEM2 instance */
static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
struct aem_find_instance_resp *fi_resp)
{
struct aem_data *data;
int i;
int res = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return res;
mutex_init(&data->lock);
/* Copy instance data */
data->ver_major = fi_resp->major;
data->ver_minor = fi_resp->minor;
data->module_handle = fi_resp->module_handle;
for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
/* Create sub-device for this fw instance */
if (aem_idr_get(&data->id))
goto id_err;
data->pdev = platform_device_alloc(DRVNAME, data->id);
if (!data->pdev)
goto dev_err;
data->pdev->dev.driver = &aem_driver.driver;
res = platform_device_add(data->pdev);
if (res)
goto ipmi_err;
dev_set_drvdata(&data->pdev->dev, data);
/* Set up IPMI interface */
if (aem_init_ipmi_data(&data->ipmi, probe->interface,
probe->bmc_device))
goto ipmi_err;
/* Register with hwmon */
data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
dev_err(&data->pdev->dev, "Unable to register hwmon "
"device for IPMI interface %d\n",
probe->interface);
goto hwmon_reg_err;
}
data->update = update_aem2_sensors;
/* Find sensors */
if (aem2_find_sensors(data))
goto sensor_err;
/* Add to our list of AEM devices */
list_add_tail(&data->list, &driver_data.aem_devices);
dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
data->ver_major, data->ver_minor,
data->module_handle);
return 0;
sensor_err:
hwmon_device_unregister(data->hwmon_dev);
hwmon_reg_err:
ipmi_destroy_user(data->ipmi.user);
ipmi_err:
dev_set_drvdata(&data->pdev->dev, NULL);
platform_device_unregister(data->pdev);
dev_err:
aem_idr_put(data->id);
id_err:
kfree(data);
return res;
}
/* Find and initialize all AEM2 instances */
static int aem_init_aem2(struct aem_ipmi_data *probe)
{
struct aem_find_instance_resp fi_resp;
int err;
int i = 0;
while (!aem_find_aem2(probe, &fi_resp, i)) {
if (fi_resp.major != 2) {
dev_err(probe->bmc_device, "Unknown AEM v%d; please "
"report this to the maintainer.\n",
fi_resp.major);
i++;
continue;
}
err = aem_init_aem2_inst(probe, &fi_resp);
if (err) {
dev_err(probe->bmc_device,
"Error %d initializing AEM2 0x%X\n",
err, fi_resp.module_handle);
return err;
}
i++;
}
return 0;
}
/* Probe a BMC for AEM firmware instances */
static void aem_register_bmc(int iface, struct device *dev)
{
struct aem_ipmi_data probe;
if (aem_init_ipmi_data(&probe, iface, dev))
return;
/* Ignore probe errors; they won't cause problems */
aem_init_aem1(&probe);
aem_init_aem2(&probe);
ipmi_destroy_user(probe.user);
}
/* Handle BMC deletion */
static void aem_bmc_gone(int iface)
{
struct aem_data *p1, *next1;
list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
if (p1->ipmi.interface == iface)
aem_delete(p1);
}
/* sysfs support functions */
/* AEM device name */
static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct aem_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
}
static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
/* AEM device version */
static ssize_t show_version(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct aem_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
}
static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
/* Display power use */
static ssize_t aem_show_power(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct aem_data *data = dev_get_drvdata(dev);
u64 before, after, delta, time;
signed long leftover;
struct timespec b, a;
mutex_lock(&data->lock);
update_aem_energy_one(data, attr->index);
getnstimeofday(&b);
before = data->energy[attr->index];
leftover = schedule_timeout_interruptible(
msecs_to_jiffies(data->power_period[attr->index])
);
if (leftover) {
mutex_unlock(&data->lock);
return 0;
}
update_aem_energy_one(data, attr->index);
getnstimeofday(&a);
after = data->energy[attr->index];
mutex_unlock(&data->lock);
time = timespec_to_ns(&a) - timespec_to_ns(&b);
delta = (after - before) * UJ_PER_MJ;
return sprintf(buf, "%llu\n",
(unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
}
/* Display energy use */
static ssize_t aem_show_energy(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct aem_data *a = dev_get_drvdata(dev);
mutex_lock(&a->lock);
update_aem_energy_one(a, attr->index);
mutex_unlock(&a->lock);
return sprintf(buf, "%llu\n",
(unsigned long long)a->energy[attr->index] * 1000);
}
/* Display power interval registers */
static ssize_t aem_show_power_period(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct aem_data *a = dev_get_drvdata(dev);
a->update(a);
return sprintf(buf, "%lu\n", a->power_period[attr->index]);
}
/* Set power interval registers */
static ssize_t aem_set_power_period(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct aem_data *a = dev_get_drvdata(dev);
unsigned long temp;
int res;
res = strict_strtoul(buf, 10, &temp);
if (res)
return res;
if (temp < AEM_MIN_POWER_INTERVAL)
return -EINVAL;
mutex_lock(&a->lock);
a->power_period[attr->index] = temp;
mutex_unlock(&a->lock);
return count;
}
/* Discover sensors on an AEM device */
static int aem_register_sensors(struct aem_data *data,
struct aem_ro_sensor_template *ro,
struct aem_rw_sensor_template *rw)
{
struct device *dev = &data->pdev->dev;
struct sensor_device_attribute *sensors = data->sensors;
int err;
/* Set up read-only sensors */
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;
err = device_create_file(dev, &sensors->dev_attr);
if (err) {
sensors->dev_attr.attr.name = NULL;
goto error;
}
sensors++;
ro++;
}
/* Set up read-write sensors */
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;
err = device_create_file(dev, &sensors->dev_attr);
if (err) {
sensors->dev_attr.attr.name = NULL;
goto error;
}
sensors++;
rw++;
}
err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
if (err)
goto error;
err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
return err;
error:
aem_remove_sensors(data);
return err;
}
/* sysfs support functions for AEM2 sensors */
/* Display temperature use */
static ssize_t aem2_show_temp(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct aem_data *a = dev_get_drvdata(dev);