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power: supply: core: Cleanup power supply sysfs attribute list
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Make the device attribute list used to create sysfs attributes more
robust by decoupling the list order from order of the enum defined in
power_supply.h. This is done by using a designated initializer in the
POWER_SUPPLY_ATTR macro.

Signed-off-by: Mathew King <mathewk@chromium.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
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Mathew King authored and Sebastian Reichel committed May 6, 2020
1 parent 72d9cd9 commit 2cabeaf
Showing 1 changed file with 132 additions and 128 deletions.
260 changes: 132 additions & 128 deletions drivers/power/supply/power_supply_sysfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,26 +18,20 @@

#include "power_supply.h"

/*
* This is because the name "current" breaks the device attr macro.
* The "current" word resolves to "(get_current())" so instead of
* "current" "(get_current())" appears in the sysfs.
*
* The source of this definition is the device.h which calls __ATTR
* macro in sysfs.h which calls the __stringify macro.
*
* Only modification that the name is not tried to be resolved
* (as a macro let's say).
*/
#define MAX_PROP_NAME_LEN 30

#define POWER_SUPPLY_ATTR(_name) \
{ \
.attr = { .name = #_name }, \
.show = power_supply_show_property, \
.store = power_supply_store_property, \
}
struct power_supply_attr {
const char *prop_name;
char attr_name[MAX_PROP_NAME_LEN + 1];
struct device_attribute dev_attr;
};

static struct device_attribute power_supply_attrs[];
#define POWER_SUPPLY_ATTR(_name) \
[POWER_SUPPLY_PROP_ ## _name] = \
{ \
.prop_name = #_name, \
.attr_name = #_name "\0", \
}

static const char * const power_supply_type_text[] = {
"Unknown", "Battery", "UPS", "Mains", "USB",
Expand Down Expand Up @@ -77,6 +71,91 @@ static const char * const power_supply_scope_text[] = {
"Unknown", "System", "Device"
};

static struct power_supply_attr power_supply_attrs[] = {
/* Properties of type `int' */
POWER_SUPPLY_ATTR(STATUS),
POWER_SUPPLY_ATTR(CHARGE_TYPE),
POWER_SUPPLY_ATTR(HEALTH),
POWER_SUPPLY_ATTR(PRESENT),
POWER_SUPPLY_ATTR(ONLINE),
POWER_SUPPLY_ATTR(AUTHENTIC),
POWER_SUPPLY_ATTR(TECHNOLOGY),
POWER_SUPPLY_ATTR(CYCLE_COUNT),
POWER_SUPPLY_ATTR(VOLTAGE_MAX),
POWER_SUPPLY_ATTR(VOLTAGE_MIN),
POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
POWER_SUPPLY_ATTR(VOLTAGE_NOW),
POWER_SUPPLY_ATTR(VOLTAGE_AVG),
POWER_SUPPLY_ATTR(VOLTAGE_OCV),
POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
POWER_SUPPLY_ATTR(CURRENT_MAX),
POWER_SUPPLY_ATTR(CURRENT_NOW),
POWER_SUPPLY_ATTR(CURRENT_AVG),
POWER_SUPPLY_ATTR(CURRENT_BOOT),
POWER_SUPPLY_ATTR(POWER_NOW),
POWER_SUPPLY_ATTR(POWER_AVG),
POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
POWER_SUPPLY_ATTR(CHARGE_FULL),
POWER_SUPPLY_ATTR(CHARGE_EMPTY),
POWER_SUPPLY_ATTR(CHARGE_NOW),
POWER_SUPPLY_ATTR(CHARGE_AVG),
POWER_SUPPLY_ATTR(CHARGE_COUNTER),
POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
POWER_SUPPLY_ATTR(ENERGY_FULL),
POWER_SUPPLY_ATTR(ENERGY_EMPTY),
POWER_SUPPLY_ATTR(ENERGY_NOW),
POWER_SUPPLY_ATTR(ENERGY_AVG),
POWER_SUPPLY_ATTR(CAPACITY),
POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
POWER_SUPPLY_ATTR(CAPACITY_LEVEL),
POWER_SUPPLY_ATTR(TEMP),
POWER_SUPPLY_ATTR(TEMP_MAX),
POWER_SUPPLY_ATTR(TEMP_MIN),
POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
POWER_SUPPLY_ATTR(TEMP_AMBIENT),
POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
POWER_SUPPLY_ATTR(TYPE),
POWER_SUPPLY_ATTR(USB_TYPE),
POWER_SUPPLY_ATTR(SCOPE),
POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
POWER_SUPPLY_ATTR(CALIBRATE),
/* Properties of type `const char *' */
POWER_SUPPLY_ATTR(MODEL_NAME),
POWER_SUPPLY_ATTR(MANUFACTURER),
POWER_SUPPLY_ATTR(SERIAL_NUMBER),
};

static struct attribute *
__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];

static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
{
return container_of(attr, struct power_supply_attr, dev_attr) -
power_supply_attrs;
}

static ssize_t power_supply_show_usb_type(struct device *dev,
const struct power_supply_desc *desc,
union power_supply_propval *value,
Expand Down Expand Up @@ -116,7 +195,7 @@ static ssize_t power_supply_show_property(struct device *dev,
char *buf) {
ssize_t ret;
struct power_supply *psy = dev_get_drvdata(dev);
enum power_supply_property psp = attr - power_supply_attrs;
enum power_supply_property psp = dev_attr_psp(attr);
union power_supply_propval value;

if (psp == POWER_SUPPLY_PROP_TYPE) {
Expand Down Expand Up @@ -184,7 +263,7 @@ static ssize_t power_supply_store_property(struct device *dev,
const char *buf, size_t count) {
ssize_t ret;
struct power_supply *psy = dev_get_drvdata(dev);
enum power_supply_property psp = attr - power_supply_attrs;
enum power_supply_property psp = dev_attr_psp(attr);
union power_supply_propval value;

switch (psp) {
Expand Down Expand Up @@ -233,86 +312,6 @@ static ssize_t power_supply_store_property(struct device *dev,
return count;
}

/* Must be in the same order as POWER_SUPPLY_PROP_* */
static struct device_attribute power_supply_attrs[] = {
/* Properties of type `int' */
POWER_SUPPLY_ATTR(status),
POWER_SUPPLY_ATTR(charge_type),
POWER_SUPPLY_ATTR(health),
POWER_SUPPLY_ATTR(present),
POWER_SUPPLY_ATTR(online),
POWER_SUPPLY_ATTR(authentic),
POWER_SUPPLY_ATTR(technology),
POWER_SUPPLY_ATTR(cycle_count),
POWER_SUPPLY_ATTR(voltage_max),
POWER_SUPPLY_ATTR(voltage_min),
POWER_SUPPLY_ATTR(voltage_max_design),
POWER_SUPPLY_ATTR(voltage_min_design),
POWER_SUPPLY_ATTR(voltage_now),
POWER_SUPPLY_ATTR(voltage_avg),
POWER_SUPPLY_ATTR(voltage_ocv),
POWER_SUPPLY_ATTR(voltage_boot),
POWER_SUPPLY_ATTR(current_max),
POWER_SUPPLY_ATTR(current_now),
POWER_SUPPLY_ATTR(current_avg),
POWER_SUPPLY_ATTR(current_boot),
POWER_SUPPLY_ATTR(power_now),
POWER_SUPPLY_ATTR(power_avg),
POWER_SUPPLY_ATTR(charge_full_design),
POWER_SUPPLY_ATTR(charge_empty_design),
POWER_SUPPLY_ATTR(charge_full),
POWER_SUPPLY_ATTR(charge_empty),
POWER_SUPPLY_ATTR(charge_now),
POWER_SUPPLY_ATTR(charge_avg),
POWER_SUPPLY_ATTR(charge_counter),
POWER_SUPPLY_ATTR(constant_charge_current),
POWER_SUPPLY_ATTR(constant_charge_current_max),
POWER_SUPPLY_ATTR(constant_charge_voltage),
POWER_SUPPLY_ATTR(constant_charge_voltage_max),
POWER_SUPPLY_ATTR(charge_control_limit),
POWER_SUPPLY_ATTR(charge_control_limit_max),
POWER_SUPPLY_ATTR(charge_control_start_threshold),
POWER_SUPPLY_ATTR(charge_control_end_threshold),
POWER_SUPPLY_ATTR(input_current_limit),
POWER_SUPPLY_ATTR(input_voltage_limit),
POWER_SUPPLY_ATTR(input_power_limit),
POWER_SUPPLY_ATTR(energy_full_design),
POWER_SUPPLY_ATTR(energy_empty_design),
POWER_SUPPLY_ATTR(energy_full),
POWER_SUPPLY_ATTR(energy_empty),
POWER_SUPPLY_ATTR(energy_now),
POWER_SUPPLY_ATTR(energy_avg),
POWER_SUPPLY_ATTR(capacity),
POWER_SUPPLY_ATTR(capacity_alert_min),
POWER_SUPPLY_ATTR(capacity_alert_max),
POWER_SUPPLY_ATTR(capacity_level),
POWER_SUPPLY_ATTR(temp),
POWER_SUPPLY_ATTR(temp_max),
POWER_SUPPLY_ATTR(temp_min),
POWER_SUPPLY_ATTR(temp_alert_min),
POWER_SUPPLY_ATTR(temp_alert_max),
POWER_SUPPLY_ATTR(temp_ambient),
POWER_SUPPLY_ATTR(temp_ambient_alert_min),
POWER_SUPPLY_ATTR(temp_ambient_alert_max),
POWER_SUPPLY_ATTR(time_to_empty_now),
POWER_SUPPLY_ATTR(time_to_empty_avg),
POWER_SUPPLY_ATTR(time_to_full_now),
POWER_SUPPLY_ATTR(time_to_full_avg),
POWER_SUPPLY_ATTR(type),
POWER_SUPPLY_ATTR(usb_type),
POWER_SUPPLY_ATTR(scope),
POWER_SUPPLY_ATTR(precharge_current),
POWER_SUPPLY_ATTR(charge_term_current),
POWER_SUPPLY_ATTR(calibrate),
/* Properties of type `const char *' */
POWER_SUPPLY_ATTR(model_name),
POWER_SUPPLY_ATTR(manufacturer),
POWER_SUPPLY_ATTR(serial_number),
};

static struct attribute *
__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];

static umode_t power_supply_attr_is_visible(struct kobject *kobj,
struct attribute *attr,
int attrno)
Expand All @@ -322,6 +321,9 @@ static umode_t power_supply_attr_is_visible(struct kobject *kobj,
umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
int i;

if (!power_supply_attrs[attrno].prop_name)
return 0;

if (attrno == POWER_SUPPLY_PROP_TYPE)
return mode;

Expand Down Expand Up @@ -350,39 +352,45 @@ static const struct attribute_group *power_supply_attr_groups[] = {
NULL,
};

void power_supply_init_attrs(struct device_type *dev_type)
static void str_to_lower(char *str)
{
int i;

dev_type->groups = power_supply_attr_groups;

for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
__power_supply_attrs[i] = &power_supply_attrs[i].attr;
while (*str) {
*str = tolower(*str);
str++;
}
}

static char *kstruprdup(const char *str, gfp_t gfp)
void power_supply_init_attrs(struct device_type *dev_type)
{
char *ret, *ustr;
int i;

ustr = ret = kmalloc(strlen(str) + 1, gfp);
dev_type->groups = power_supply_attr_groups;

if (!ret)
return NULL;
for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
struct device_attribute *attr;

while (*str)
*ustr++ = toupper(*str++);
if (!power_supply_attrs[i].prop_name) {
pr_warn("%s: Property %d skipped because is is missing from power_supply_attrs\n",
__func__, i);
sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
} else {
str_to_lower(power_supply_attrs[i].attr_name);
}

*ustr = 0;
attr = &power_supply_attrs[i].dev_attr;

return ret;
attr->attr.name = power_supply_attrs[i].attr_name;
attr->show = power_supply_show_property;
attr->store = power_supply_store_property;
__power_supply_attrs[i] = &attr->attr;
}
}

int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct power_supply *psy = dev_get_drvdata(dev);
int ret = 0, j;
char *prop_buf;
char *attrname;

if (!psy || !psy->desc) {
dev_dbg(dev, "No power supply yet\n");
Expand All @@ -398,12 +406,14 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
return -ENOMEM;

for (j = 0; j < psy->desc->num_properties; j++) {
struct device_attribute *attr;
struct power_supply_attr *pwr_attr;
struct device_attribute *dev_attr;
char *line;

attr = &power_supply_attrs[psy->desc->properties[j]];
pwr_attr = &power_supply_attrs[psy->desc->properties[j]];
dev_attr = &pwr_attr->dev_attr;

ret = power_supply_show_property(dev, attr, prop_buf);
ret = power_supply_show_property(dev, dev_attr, prop_buf);
if (ret == -ENODEV || ret == -ENODATA) {
/* When a battery is absent, we expect -ENODEV. Don't abort;
send the uevent with at least the the PRESENT=0 property */
Expand All @@ -418,14 +428,8 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
if (line)
*line = 0;

attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
if (!attrname) {
ret = -ENOMEM;
goto out;
}

ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
kfree(attrname);
ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s",
pwr_attr->prop_name, prop_buf);
if (ret)
goto out;
}
Expand Down

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