cregit-Linux how code gets into the kernel

Release 4.14 drivers/power/supply/power_supply_sysfs.c

/*
 *  Sysfs interface for the universal power supply monitor class
 *
 *  Copyright © 2007  David Woodhouse <dwmw2@infradead.org>
 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
 *
 *  Modified: 2004, Oct     Szabolcs Gyurko
 *
 *  You may use this code as per GPL version 2
 */

#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/stat.h>

#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 POWER_SUPPLY_ATTR(_name)					\
{                                                                       \
        .attr = { .name = #_name },                                     \
        .show = power_supply_show_property,                             \
        .store = power_supply_store_property,                           \
}


static struct device_attribute power_supply_attrs[];


static const char * const power_supply_type_text[] = {
	"Unknown", "Battery", "UPS", "Mains", "USB",
	"USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
	"USB_PD", "USB_PD_DRP", "BrickID"
};


static const char * const power_supply_status_text[] = {
	"Unknown", "Charging", "Discharging", "Not charging", "Full"
};


static const char * const power_supply_charge_type_text[] = {
	"Unknown", "N/A", "Trickle", "Fast"
};


static const char * const power_supply_health_text[] = {
	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
	"Unspecified failure", "Cold", "Watchdog timer expire",
	"Safety timer expire"
};


static const char * const power_supply_technology_text[] = {
	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
	"LiMn"
};


static const char * const power_supply_capacity_level_text[] = {
	"Unknown", "Critical", "Low", "Normal", "High", "Full"
};


static const char * const power_supply_scope_text[] = {
	"Unknown", "System", "Device"
};


static ssize_t power_supply_show_property(struct device *dev, struct device_attribute *attr, char *buf) { ssize_t ret = 0; struct power_supply *psy = dev_get_drvdata(dev); const ptrdiff_t off = attr - power_supply_attrs; union power_supply_propval value; if (off == POWER_SUPPLY_PROP_TYPE) { value.intval = psy->desc->type; } else { ret = power_supply_get_property(psy, off, &value); if (ret < 0) { if (ret == -ENODATA) dev_dbg(dev, "driver has no data for `%s' property\n", attr->attr.name); else if (ret != -ENODEV && ret != -EAGAIN) dev_err(dev, "driver failed to report `%s' property: %zd\n", attr->attr.name, ret); return ret; } } if (off == POWER_SUPPLY_PROP_STATUS) return sprintf(buf, "%s\n", power_supply_status_text[value.intval]); else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) return sprintf(buf, "%s\n", power_supply_charge_type_text[value.intval]); else if (off == POWER_SUPPLY_PROP_HEALTH) return sprintf(buf, "%s\n", power_supply_health_text[value.intval]); else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) return sprintf(buf, "%s\n", power_supply_technology_text[value.intval]); else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) return sprintf(buf, "%s\n", power_supply_capacity_level_text[value.intval]); else if (off == POWER_SUPPLY_PROP_TYPE) return sprintf(buf, "%s\n", power_supply_type_text[value.intval]); else if (off == POWER_SUPPLY_PROP_SCOPE) return sprintf(buf, "%s\n", power_supply_scope_text[value.intval]); else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) return sprintf(buf, "%s\n", value.strval); return sprintf(buf, "%d\n", value.intval); }

Contributors

PersonTokensPropCommitsCommitProp
Anton Vorontsov21967.80%323.08%
Andres Salomon4213.00%215.38%
David Lechner268.05%17.69%
Jeremy Fitzhardinge216.50%17.69%
Rhyland Klein51.55%17.69%
Viresh Kumar41.24%17.69%
Krzysztof Kozlowski30.93%215.38%
Mark Brown20.62%17.69%
Randy Dunlap10.31%17.69%
Total323100.00%13100.00%


static ssize_t power_supply_store_property(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { ssize_t ret; struct power_supply *psy = dev_get_drvdata(dev); const ptrdiff_t off = attr - power_supply_attrs; union power_supply_propval value; /* maybe it is a enum property? */ switch (off) { case POWER_SUPPLY_PROP_STATUS: ret = sysfs_match_string(power_supply_status_text, buf); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: ret = sysfs_match_string(power_supply_charge_type_text, buf); break; case POWER_SUPPLY_PROP_HEALTH: ret = sysfs_match_string(power_supply_health_text, buf); break; case POWER_SUPPLY_PROP_TECHNOLOGY: ret = sysfs_match_string(power_supply_technology_text, buf); break; case POWER_SUPPLY_PROP_CAPACITY_LEVEL: ret = sysfs_match_string(power_supply_capacity_level_text, buf); break; case POWER_SUPPLY_PROP_SCOPE: ret = sysfs_match_string(power_supply_scope_text, buf); break; default: ret = -EINVAL; } /* * If no match was found, then check to see if it is an integer. * Integer values are valid for enums in addition to the text value. */ if (ret < 0) { long long_val; ret = kstrtol(buf, 10, &long_val); if (ret < 0) return ret; ret = long_val; } value.intval = ret; ret = power_supply_set_property(psy, off, &value); if (ret < 0) return ret; return count; }

Contributors

PersonTokensPropCommitsCommitProp
David Lechner10550.72%125.00%
Daniel Mack10048.31%125.00%
Krzysztof Kozlowski10.48%125.00%
Jingoo Han10.48%125.00%
Total207100.00%4100.00%

/* 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(input_current_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(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) { struct device *dev = container_of(kobj, struct device, kobj); struct power_supply *psy = dev_get_drvdata(dev); umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; int i; if (attrno == POWER_SUPPLY_PROP_TYPE) return mode; for (i = 0; i < psy->desc->num_properties; i++) { int property = psy->desc->properties[i]; if (property == attrno) { if (psy->desc->property_is_writeable && psy->desc->property_is_writeable(psy, property) > 0) mode |= S_IWUSR; return mode; } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Vorontsov7757.04%228.57%
Daniel Mack4533.33%228.57%
Krzysztof Kozlowski118.15%228.57%
Al Viro21.48%114.29%
Total135100.00%7100.00%

static struct attribute_group power_supply_attr_group = { .attrs = __power_supply_attrs, .is_visible = power_supply_attr_is_visible, }; static const struct attribute_group *power_supply_attr_groups[] = { &power_supply_attr_group, NULL, };
void power_supply_init_attrs(struct device_type *dev_type) { 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; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Vorontsov48100.00%2100.00%
Total48100.00%2100.00%


static char *kstruprdup(const char *str, gfp_t gfp) { char *ret, *ustr; ustr = ret = kmalloc(strlen(str) + 1, gfp); if (!ret) return NULL; while (*str) *ustr++ = toupper(*str++); *ustr = 0; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Vorontsov70100.00%1100.00%
Total70100.00%1100.00%


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; dev_dbg(dev, "uevent\n"); if (!psy || !psy->desc) { dev_dbg(dev, "No power supply yet\n"); return ret; } dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name); ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); if (ret) return ret; prop_buf = (char *)get_zeroed_page(GFP_KERNEL); if (!prop_buf) return -ENOMEM; for (j = 0; j < psy->desc->num_properties; j++) { struct device_attribute *attr; char *line; attr = &power_supply_attrs[psy->desc->properties[j]]; ret = power_supply_show_property(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 */ ret = 0; continue; } if (ret < 0) goto out; line = strchr(prop_buf, '\n'); if (line) *line = 0; attrname = kstruprdup(attr->attr.name, GFP_KERNEL); if (!attrname) { ret = -ENOMEM; goto out; } dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); kfree(attrname); if (ret) goto out; } out: free_page((unsigned long)prop_buf); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Vorontsov28092.41%120.00%
Krzysztof Kozlowski92.97%120.00%
Lars-Peter Clausen51.65%120.00%
Kay Sievers51.65%120.00%
Dmitry Baryshkov41.32%120.00%
Total303100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Anton Vorontsov100660.28%36.38%
David Lechner1529.11%12.13%
Daniel Mack1468.75%24.26%
Andres Salomon915.45%36.38%
Ramakrishna Pallala905.39%817.02%
Jeremy Fitzhardinge392.34%12.13%
Krzysztof Kozlowski241.44%48.51%
Jenny TC201.20%12.13%
Dmitry Baryshkov160.96%24.26%
Alexey Y. Starikovskiy150.90%24.26%
Heikki Krogerus110.66%24.26%
Benson Leung80.48%24.26%
Paul Gortmaker60.36%24.26%
Liam Breck50.30%12.13%
Kay Sievers50.30%12.13%
Lars-Peter Clausen50.30%12.13%
Maximilian Attems50.30%12.13%
Rhyland Klein50.30%12.13%
Mark Brown40.24%24.26%
Viresh Kumar40.24%12.13%
Adrian Bunk30.18%12.13%
Tejun Heo30.18%12.13%
Kim (Woogyom) Milo20.12%12.13%
Al Viro20.12%12.13%
Jingoo Han10.06%12.13%
Randy Dunlap10.06%12.13%
Total1669100.00%47100.00%
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