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hwmon.c
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hwmon.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
*
* This file defines the sysfs class "hwmon", for use by sensors drivers.
*
* Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gfp.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/idr.h>
#include <linux/kstrtox.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/thermal.h>
#define CREATE_TRACE_POINTS
#include <trace/events/hwmon.h>
#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
struct hwmon_device {
const char *name;
const char *label;
struct device dev;
const struct hwmon_chip_info *chip;
struct list_head tzdata;
struct attribute_group group;
const struct attribute_group **groups;
};
#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
#define MAX_SYSFS_ATTR_NAME_LENGTH 32
struct hwmon_device_attribute {
struct device_attribute dev_attr;
const struct hwmon_ops *ops;
enum hwmon_sensor_types type;
u32 attr;
int index;
char name[MAX_SYSFS_ATTR_NAME_LENGTH];
};
#define to_hwmon_attr(d) \
container_of(d, struct hwmon_device_attribute, dev_attr)
#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
/*
* Thermal zone information
*/
struct hwmon_thermal_data {
struct list_head node; /* hwmon tzdata list entry */
struct device *dev; /* Reference to hwmon device */
int index; /* sensor index */
struct thermal_zone_device *tzd;/* thermal zone device */
};
static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
}
static DEVICE_ATTR_RO(name);
static ssize_t
label_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);
}
static DEVICE_ATTR_RO(label);
static struct attribute *hwmon_dev_attrs[] = {
&dev_attr_name.attr,
&dev_attr_label.attr,
NULL
};
static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct hwmon_device *hdev = to_hwmon_device(dev);
if (attr == &dev_attr_name.attr && hdev->name == NULL)
return 0;
if (attr == &dev_attr_label.attr && hdev->label == NULL)
return 0;
return attr->mode;
}
static const struct attribute_group hwmon_dev_attr_group = {
.attrs = hwmon_dev_attrs,
.is_visible = hwmon_dev_attr_is_visible,
};
static const struct attribute_group *hwmon_dev_attr_groups[] = {
&hwmon_dev_attr_group,
NULL
};
static void hwmon_free_attrs(struct attribute **attrs)
{
int i;
for (i = 0; attrs[i]; i++) {
struct device_attribute *dattr = to_dev_attr(attrs[i]);
struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
kfree(hattr);
}
kfree(attrs);
}
static void hwmon_dev_release(struct device *dev)
{
struct hwmon_device *hwdev = to_hwmon_device(dev);
if (hwdev->group.attrs)
hwmon_free_attrs(hwdev->group.attrs);
kfree(hwdev->groups);
kfree(hwdev->label);
kfree(hwdev);
}
static const struct class hwmon_class = {
.name = "hwmon",
.dev_groups = hwmon_dev_attr_groups,
.dev_release = hwmon_dev_release,
};
static DEFINE_IDA(hwmon_ida);
/* Thermal zone handling */
/*
* The complex conditional is necessary to avoid a cyclic dependency
* between hwmon and thermal_sys modules.
*/
#ifdef CONFIG_THERMAL_OF
static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
int ret;
long t;
ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
tdata->index, &t);
if (ret < 0)
return ret;
*temp = t;
return 0;
}
static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
const struct hwmon_chip_info *chip = hwdev->chip;
const struct hwmon_channel_info * const *info = chip->info;
unsigned int i;
int err;
if (!chip->ops->write)
return 0;
for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
continue;
if (!info[i])
return 0;
if (info[i]->config[tdata->index] & HWMON_T_MIN) {
err = chip->ops->write(tdata->dev, hwmon_temp,
hwmon_temp_min, tdata->index, low);
if (err && err != -EOPNOTSUPP)
return err;
}
if (info[i]->config[tdata->index] & HWMON_T_MAX) {
err = chip->ops->write(tdata->dev, hwmon_temp,
hwmon_temp_max, tdata->index, high);
if (err && err != -EOPNOTSUPP)
return err;
}
return 0;
}
static const struct thermal_zone_device_ops hwmon_thermal_ops = {
.get_temp = hwmon_thermal_get_temp,
.set_trips = hwmon_thermal_set_trips,
};
static void hwmon_thermal_remove_sensor(void *data)
{
list_del(data);
}
static int hwmon_thermal_add_sensor(struct device *dev, int index)
{
struct hwmon_device *hwdev = to_hwmon_device(dev);
struct hwmon_thermal_data *tdata;
struct thermal_zone_device *tzd;
int err;
tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
if (!tdata)
return -ENOMEM;
tdata->dev = dev;
tdata->index = index;
tzd = devm_thermal_of_zone_register(dev, index, tdata,
&hwmon_thermal_ops);
if (IS_ERR(tzd)) {
if (PTR_ERR(tzd) != -ENODEV)
return PTR_ERR(tzd);
dev_info(dev, "temp%d_input not attached to any thermal zone\n",
index + 1);
devm_kfree(dev, tdata);
return 0;
}
err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
if (err)
return err;
tdata->tzd = tzd;
list_add(&tdata->node, &hwdev->tzdata);
return 0;
}
static int hwmon_thermal_register_sensors(struct device *dev)
{
struct hwmon_device *hwdev = to_hwmon_device(dev);
const struct hwmon_chip_info *chip = hwdev->chip;
const struct hwmon_channel_info * const *info = chip->info;
void *drvdata = dev_get_drvdata(dev);
int i;
for (i = 1; info[i]; i++) {
int j;
if (info[i]->type != hwmon_temp)
continue;
for (j = 0; info[i]->config[j]; j++) {
int err;
if (!(info[i]->config[j] & HWMON_T_INPUT) ||
!chip->ops->is_visible(drvdata, hwmon_temp,
hwmon_temp_input, j))
continue;
err = hwmon_thermal_add_sensor(dev, j);
if (err)
return err;
}
}
return 0;
}
static void hwmon_thermal_notify(struct device *dev, int index)
{
struct hwmon_device *hwdev = to_hwmon_device(dev);
struct hwmon_thermal_data *tzdata;
list_for_each_entry(tzdata, &hwdev->tzdata, node) {
if (tzdata->index == index) {
thermal_zone_device_update(tzdata->tzd,
THERMAL_EVENT_UNSPECIFIED);
}
}
}
#else
static int hwmon_thermal_register_sensors(struct device *dev)
{
return 0;
}
static void hwmon_thermal_notify(struct device *dev, int index) { }
#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
static int hwmon_attr_base(enum hwmon_sensor_types type)
{
if (type == hwmon_in || type == hwmon_intrusion)
return 0;
return 1;
}
#if IS_REACHABLE(CONFIG_I2C)
/*
* PEC support
*
* The 'pec' attribute is attached to I2C client devices. It is only provided
* if the i2c controller supports PEC.
*
* The mutex ensures that PEC configuration between i2c device and the hardware
* is consistent. Use a single mutex because attribute writes are supposed to be
* rare, and maintaining a separate mutex for each hardware monitoring device
* would add substantial complexity to the driver for little if any gain.
*
* The hardware monitoring device is identified as child of the i2c client
* device. This assumes that only a single hardware monitoring device is
* attached to an i2c client device.
*/
static DEFINE_MUTEX(hwmon_pec_mutex);
static int hwmon_match_device(struct device *dev, void *data)
{
return dev->class == &hwmon_class;
}
static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
return sysfs_emit(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
}
static ssize_t pec_store(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct hwmon_device *hwdev;
struct device *hdev;
bool val;
int err;
err = kstrtobool(buf, &val);
if (err < 0)
return err;
hdev = device_find_child(dev, NULL, hwmon_match_device);
if (!hdev)
return -ENODEV;
mutex_lock(&hwmon_pec_mutex);
/*
* If there is no write function, we assume that chip specific
* handling is not required.
*/
hwdev = to_hwmon_device(hdev);
if (hwdev->chip->ops->write) {
err = hwdev->chip->ops->write(hdev, hwmon_chip, hwmon_chip_pec, 0, val);
if (err && err != -EOPNOTSUPP)
goto unlock;
}
if (!val)
client->flags &= ~I2C_CLIENT_PEC;
else
client->flags |= I2C_CLIENT_PEC;
err = count;
unlock:
mutex_unlock(&hwmon_pec_mutex);
put_device(hdev);
return err;
}
static DEVICE_ATTR_RW(pec);
static void hwmon_remove_pec(void *dev)
{
device_remove_file(dev, &dev_attr_pec);
}
static int hwmon_pec_register(struct device *hdev)
{
struct i2c_client *client = i2c_verify_client(hdev->parent);
int err;
if (!client)
return -EINVAL;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC))
return 0;
err = device_create_file(&client->dev, &dev_attr_pec);
if (err)
return err;
return devm_add_action_or_reset(hdev, hwmon_remove_pec, &client->dev);
}
#else /* CONFIG_I2C */
static int hwmon_pec_register(struct device *hdev)
{
return -EINVAL;
}
#endif /* CONFIG_I2C */
/* sysfs attribute management */
static ssize_t hwmon_attr_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
long val;
int ret;
ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
&val);
if (ret < 0)
return ret;
trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
hattr->name, val);
return sprintf(buf, "%ld\n", val);
}
static ssize_t hwmon_attr_show_string(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
enum hwmon_sensor_types type = hattr->type;
const char *s;
int ret;
ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
hattr->index, &s);
if (ret < 0)
return ret;
trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
hattr->name, s);
return sprintf(buf, "%s\n", s);
}
static ssize_t hwmon_attr_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
long val;
int ret;
ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
val);
if (ret < 0)
return ret;
trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
hattr->name, val);
return count;
}
static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
{
return (type == hwmon_temp && attr == hwmon_temp_label) ||
(type == hwmon_in && attr == hwmon_in_label) ||
(type == hwmon_curr && attr == hwmon_curr_label) ||
(type == hwmon_power && attr == hwmon_power_label) ||
(type == hwmon_energy && attr == hwmon_energy_label) ||
(type == hwmon_humidity && attr == hwmon_humidity_label) ||
(type == hwmon_fan && attr == hwmon_fan_label);
}
static struct attribute *hwmon_genattr(const void *drvdata,
enum hwmon_sensor_types type,
u32 attr,
int index,
const char *template,
const struct hwmon_ops *ops)
{
struct hwmon_device_attribute *hattr;
struct device_attribute *dattr;
struct attribute *a;
umode_t mode;
const char *name;
bool is_string = is_string_attr(type, attr);
mode = ops->is_visible(drvdata, type, attr, index);
if (!mode)
return ERR_PTR(-ENOENT);
if ((mode & 0444) && ((is_string && !ops->read_string) ||
(!is_string && !ops->read)))
return ERR_PTR(-EINVAL);
if ((mode & 0222) && !ops->write)
return ERR_PTR(-EINVAL);
hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
if (!hattr)
return ERR_PTR(-ENOMEM);
if (type == hwmon_chip) {
name = template;
} else {
scnprintf(hattr->name, sizeof(hattr->name), template,
index + hwmon_attr_base(type));
name = hattr->name;
}
hattr->type = type;
hattr->attr = attr;
hattr->index = index;
hattr->ops = ops;
dattr = &hattr->dev_attr;
dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
dattr->store = hwmon_attr_store;
a = &dattr->attr;
sysfs_attr_init(a);
a->name = name;
a->mode = mode;
return a;
}
/*
* Chip attributes are not attribute templates but actual sysfs attributes.
* See hwmon_genattr() for special handling.
*/
static const char * const hwmon_chip_attrs[] = {
[hwmon_chip_temp_reset_history] = "temp_reset_history",
[hwmon_chip_in_reset_history] = "in_reset_history",
[hwmon_chip_curr_reset_history] = "curr_reset_history",
[hwmon_chip_power_reset_history] = "power_reset_history",
[hwmon_chip_update_interval] = "update_interval",
[hwmon_chip_alarms] = "alarms",
[hwmon_chip_samples] = "samples",
[hwmon_chip_curr_samples] = "curr_samples",
[hwmon_chip_in_samples] = "in_samples",
[hwmon_chip_power_samples] = "power_samples",
[hwmon_chip_temp_samples] = "temp_samples",
[hwmon_chip_beep_enable] = "beep_enable",
};
static const char * const hwmon_temp_attr_templates[] = {
[hwmon_temp_enable] = "temp%d_enable",
[hwmon_temp_input] = "temp%d_input",
[hwmon_temp_type] = "temp%d_type",
[hwmon_temp_lcrit] = "temp%d_lcrit",
[hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
[hwmon_temp_min] = "temp%d_min",
[hwmon_temp_min_hyst] = "temp%d_min_hyst",
[hwmon_temp_max] = "temp%d_max",
[hwmon_temp_max_hyst] = "temp%d_max_hyst",
[hwmon_temp_crit] = "temp%d_crit",
[hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
[hwmon_temp_emergency] = "temp%d_emergency",
[hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
[hwmon_temp_alarm] = "temp%d_alarm",
[hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
[hwmon_temp_min_alarm] = "temp%d_min_alarm",
[hwmon_temp_max_alarm] = "temp%d_max_alarm",
[hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
[hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
[hwmon_temp_fault] = "temp%d_fault",
[hwmon_temp_offset] = "temp%d_offset",
[hwmon_temp_label] = "temp%d_label",
[hwmon_temp_lowest] = "temp%d_lowest",
[hwmon_temp_highest] = "temp%d_highest",
[hwmon_temp_reset_history] = "temp%d_reset_history",
[hwmon_temp_rated_min] = "temp%d_rated_min",
[hwmon_temp_rated_max] = "temp%d_rated_max",
[hwmon_temp_beep] = "temp%d_beep",
};
static const char * const hwmon_in_attr_templates[] = {
[hwmon_in_enable] = "in%d_enable",
[hwmon_in_input] = "in%d_input",
[hwmon_in_min] = "in%d_min",
[hwmon_in_max] = "in%d_max",
[hwmon_in_lcrit] = "in%d_lcrit",
[hwmon_in_crit] = "in%d_crit",
[hwmon_in_average] = "in%d_average",
[hwmon_in_lowest] = "in%d_lowest",
[hwmon_in_highest] = "in%d_highest",
[hwmon_in_reset_history] = "in%d_reset_history",
[hwmon_in_label] = "in%d_label",
[hwmon_in_alarm] = "in%d_alarm",
[hwmon_in_min_alarm] = "in%d_min_alarm",
[hwmon_in_max_alarm] = "in%d_max_alarm",
[hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
[hwmon_in_crit_alarm] = "in%d_crit_alarm",
[hwmon_in_rated_min] = "in%d_rated_min",
[hwmon_in_rated_max] = "in%d_rated_max",
[hwmon_in_beep] = "in%d_beep",
[hwmon_in_fault] = "in%d_fault",
};
static const char * const hwmon_curr_attr_templates[] = {
[hwmon_curr_enable] = "curr%d_enable",
[hwmon_curr_input] = "curr%d_input",
[hwmon_curr_min] = "curr%d_min",
[hwmon_curr_max] = "curr%d_max",
[hwmon_curr_lcrit] = "curr%d_lcrit",
[hwmon_curr_crit] = "curr%d_crit",
[hwmon_curr_average] = "curr%d_average",
[hwmon_curr_lowest] = "curr%d_lowest",
[hwmon_curr_highest] = "curr%d_highest",
[hwmon_curr_reset_history] = "curr%d_reset_history",
[hwmon_curr_label] = "curr%d_label",
[hwmon_curr_alarm] = "curr%d_alarm",
[hwmon_curr_min_alarm] = "curr%d_min_alarm",
[hwmon_curr_max_alarm] = "curr%d_max_alarm",
[hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
[hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
[hwmon_curr_rated_min] = "curr%d_rated_min",
[hwmon_curr_rated_max] = "curr%d_rated_max",
[hwmon_curr_beep] = "curr%d_beep",
};
static const char * const hwmon_power_attr_templates[] = {
[hwmon_power_enable] = "power%d_enable",
[hwmon_power_average] = "power%d_average",
[hwmon_power_average_interval] = "power%d_average_interval",
[hwmon_power_average_interval_max] = "power%d_interval_max",
[hwmon_power_average_interval_min] = "power%d_interval_min",
[hwmon_power_average_highest] = "power%d_average_highest",
[hwmon_power_average_lowest] = "power%d_average_lowest",
[hwmon_power_average_max] = "power%d_average_max",
[hwmon_power_average_min] = "power%d_average_min",
[hwmon_power_input] = "power%d_input",
[hwmon_power_input_highest] = "power%d_input_highest",
[hwmon_power_input_lowest] = "power%d_input_lowest",
[hwmon_power_reset_history] = "power%d_reset_history",
[hwmon_power_accuracy] = "power%d_accuracy",
[hwmon_power_cap] = "power%d_cap",
[hwmon_power_cap_hyst] = "power%d_cap_hyst",
[hwmon_power_cap_max] = "power%d_cap_max",
[hwmon_power_cap_min] = "power%d_cap_min",
[hwmon_power_min] = "power%d_min",
[hwmon_power_max] = "power%d_max",
[hwmon_power_lcrit] = "power%d_lcrit",
[hwmon_power_crit] = "power%d_crit",
[hwmon_power_label] = "power%d_label",
[hwmon_power_alarm] = "power%d_alarm",
[hwmon_power_cap_alarm] = "power%d_cap_alarm",
[hwmon_power_min_alarm] = "power%d_min_alarm",
[hwmon_power_max_alarm] = "power%d_max_alarm",
[hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
[hwmon_power_crit_alarm] = "power%d_crit_alarm",
[hwmon_power_rated_min] = "power%d_rated_min",
[hwmon_power_rated_max] = "power%d_rated_max",
};
static const char * const hwmon_energy_attr_templates[] = {
[hwmon_energy_enable] = "energy%d_enable",
[hwmon_energy_input] = "energy%d_input",
[hwmon_energy_label] = "energy%d_label",
};
static const char * const hwmon_humidity_attr_templates[] = {
[hwmon_humidity_enable] = "humidity%d_enable",
[hwmon_humidity_input] = "humidity%d_input",
[hwmon_humidity_label] = "humidity%d_label",
[hwmon_humidity_min] = "humidity%d_min",
[hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
[hwmon_humidity_max] = "humidity%d_max",
[hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
[hwmon_humidity_alarm] = "humidity%d_alarm",
[hwmon_humidity_fault] = "humidity%d_fault",
[hwmon_humidity_rated_min] = "humidity%d_rated_min",
[hwmon_humidity_rated_max] = "humidity%d_rated_max",
[hwmon_humidity_min_alarm] = "humidity%d_min_alarm",
[hwmon_humidity_max_alarm] = "humidity%d_max_alarm",
};
static const char * const hwmon_fan_attr_templates[] = {
[hwmon_fan_enable] = "fan%d_enable",
[hwmon_fan_input] = "fan%d_input",
[hwmon_fan_label] = "fan%d_label",
[hwmon_fan_min] = "fan%d_min",
[hwmon_fan_max] = "fan%d_max",
[hwmon_fan_div] = "fan%d_div",
[hwmon_fan_pulses] = "fan%d_pulses",
[hwmon_fan_target] = "fan%d_target",
[hwmon_fan_alarm] = "fan%d_alarm",
[hwmon_fan_min_alarm] = "fan%d_min_alarm",
[hwmon_fan_max_alarm] = "fan%d_max_alarm",
[hwmon_fan_fault] = "fan%d_fault",
[hwmon_fan_beep] = "fan%d_beep",
};
static const char * const hwmon_pwm_attr_templates[] = {
[hwmon_pwm_input] = "pwm%d",
[hwmon_pwm_enable] = "pwm%d_enable",
[hwmon_pwm_mode] = "pwm%d_mode",
[hwmon_pwm_freq] = "pwm%d_freq",
[hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp",
};
static const char * const hwmon_intrusion_attr_templates[] = {
[hwmon_intrusion_alarm] = "intrusion%d_alarm",
[hwmon_intrusion_beep] = "intrusion%d_beep",
};
static const char * const *__templates[] = {
[hwmon_chip] = hwmon_chip_attrs,
[hwmon_temp] = hwmon_temp_attr_templates,
[hwmon_in] = hwmon_in_attr_templates,
[hwmon_curr] = hwmon_curr_attr_templates,
[hwmon_power] = hwmon_power_attr_templates,
[hwmon_energy] = hwmon_energy_attr_templates,
[hwmon_humidity] = hwmon_humidity_attr_templates,
[hwmon_fan] = hwmon_fan_attr_templates,
[hwmon_pwm] = hwmon_pwm_attr_templates,
[hwmon_intrusion] = hwmon_intrusion_attr_templates,
};
static const int __templates_size[] = {
[hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
[hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
[hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
[hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
[hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
[hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
[hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
[hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
[hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
[hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
};
int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel)
{
char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
char *envp[] = { event, NULL };
const char * const *templates;
const char *template;
int base;
if (type >= ARRAY_SIZE(__templates))
return -EINVAL;
if (attr >= __templates_size[type])
return -EINVAL;
templates = __templates[type];
template = templates[attr];
base = hwmon_attr_base(type);
scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
scnprintf(event, sizeof(event), "NAME=%s", sattr);
sysfs_notify(&dev->kobj, NULL, sattr);
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
if (type == hwmon_temp)
hwmon_thermal_notify(dev, channel);
return 0;
}
EXPORT_SYMBOL_GPL(hwmon_notify_event);
static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
{
int i, n;
for (i = n = 0; info->config[i]; i++)
n += hweight32(info->config[i]);
return n;
}
static int hwmon_genattrs(const void *drvdata,
struct attribute **attrs,
const struct hwmon_ops *ops,
const struct hwmon_channel_info *info)
{
const char * const *templates;
int template_size;
int i, aindex = 0;
if (info->type >= ARRAY_SIZE(__templates))
return -EINVAL;
templates = __templates[info->type];
template_size = __templates_size[info->type];
for (i = 0; info->config[i]; i++) {
u32 attr_mask = info->config[i];
u32 attr;
while (attr_mask) {
struct attribute *a;
attr = __ffs(attr_mask);
attr_mask &= ~BIT(attr);
if (attr >= template_size || !templates[attr])
continue; /* attribute is invisible */
a = hwmon_genattr(drvdata, info->type, attr, i,
templates[attr], ops);
if (IS_ERR(a)) {
if (PTR_ERR(a) != -ENOENT)
return PTR_ERR(a);
continue;
}
attrs[aindex++] = a;
}
}
return aindex;
}
static struct attribute **
__hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
{
int ret, i, aindex = 0, nattrs = 0;
struct attribute **attrs;
for (i = 0; chip->info[i]; i++)
nattrs += hwmon_num_channel_attrs(chip->info[i]);
if (nattrs == 0)
return ERR_PTR(-EINVAL);
attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
if (!attrs)
return ERR_PTR(-ENOMEM);
for (i = 0; chip->info[i]; i++) {
ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
chip->info[i]);
if (ret < 0) {
hwmon_free_attrs(attrs);
return ERR_PTR(ret);
}
aindex += ret;
}
return attrs;
}
static struct device *
__hwmon_device_register(struct device *dev, const char *name, void *drvdata,
const struct hwmon_chip_info *chip,
const struct attribute_group **groups)
{
struct hwmon_device *hwdev;
const char *label;
struct device *hdev;
struct device *tdev = dev;
int i, err, id;
/* Complain about invalid characters in hwmon name attribute */
if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
dev_warn(dev,
"hwmon: '%s' is not a valid name attribute, please fix\n",
name);
id = ida_alloc(&hwmon_ida, GFP_KERNEL);
if (id < 0)
return ERR_PTR(id);
hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
if (hwdev == NULL) {
err = -ENOMEM;
goto ida_remove;
}
hdev = &hwdev->dev;
if (chip) {
struct attribute **attrs;
int ngroups = 2; /* terminating NULL plus &hwdev->groups */
if (groups)
for (i = 0; groups[i]; i++)
ngroups++;
hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
if (!hwdev->groups) {
err = -ENOMEM;
goto free_hwmon;
}
attrs = __hwmon_create_attrs(drvdata, chip);
if (IS_ERR(attrs)) {
err = PTR_ERR(attrs);
goto free_hwmon;
}
hwdev->group.attrs = attrs;
ngroups = 0;
hwdev->groups[ngroups++] = &hwdev->group;
if (groups) {
for (i = 0; groups[i]; i++)
hwdev->groups[ngroups++] = groups[i];
}
hdev->groups = hwdev->groups;
} else {
hdev->groups = groups;
}
if (dev && device_property_present(dev, "label")) {
err = device_property_read_string(dev, "label", &label);
if (err < 0)
goto free_hwmon;
hwdev->label = kstrdup(label, GFP_KERNEL);
if (hwdev->label == NULL) {
err = -ENOMEM;
goto free_hwmon;
}
}
hwdev->name = name;
hdev->class = &hwmon_class;
hdev->parent = dev;
while (tdev && !tdev->of_node)
tdev = tdev->parent;
hdev->of_node = tdev ? tdev->of_node : NULL;
hwdev->chip = chip;
dev_set_drvdata(hdev, drvdata);
dev_set_name(hdev, HWMON_ID_FORMAT, id);
err = device_register(hdev);
if (err) {
put_device(hdev);
goto ida_remove;
}
INIT_LIST_HEAD(&hwdev->tzdata);
if (hdev->of_node && chip && chip->ops->read &&
chip->info[0]->type == hwmon_chip) {
u32 config = chip->info[0]->config[0];
if (config & HWMON_C_REGISTER_TZ) {
err = hwmon_thermal_register_sensors(hdev);
if (err) {
device_unregister(hdev);
/*
* Don't worry about hwdev; hwmon_dev_release(),
* called from device_unregister(), will free it.
*/
goto ida_remove;
}
}
if (config & HWMON_C_PEC) {
err = hwmon_pec_register(hdev);
if (err) {
device_unregister(hdev);
goto ida_remove;
}
}
}
return hdev;
free_hwmon:
hwmon_dev_release(hdev);
ida_remove:
ida_free(&hwmon_ida, id);
return ERR_PTR(err);
}
/**
* hwmon_device_register_with_groups - register w/ hwmon
* @dev: the parent device
* @name: hwmon name attribute
* @drvdata: driver data to attach to created device
* @groups: List of attribute groups to create
*
* hwmon_device_unregister() must be called when the device is no
* longer needed.
*
* Returns the pointer to the new device.
*/