X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fpower%2Fpower_supply_sysfs.c;fp=kernel%2Fdrivers%2Fpower%2Fpower_supply_sysfs.c;h=9134e3d2d95ef9bfbfca479fd276d93ad2e8e7fb;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/power/power_supply_sysfs.c b/kernel/drivers/power/power_supply_sysfs.c new file mode 100644 index 000000000..9134e3d2d --- /dev/null +++ b/kernel/drivers/power/power_supply_sysfs.c @@ -0,0 +1,336 @@ +/* + * Sysfs interface for the universal power supply monitor class + * + * Copyright © 2007 David Woodhouse + * Copyright © 2007 Anton Vorontsov + * Copyright © 2004 Szabolcs Gyurko + * Copyright © 2003 Ian Molton + * + * Modified: 2004, Oct Szabolcs Gyurko + * + * You may use this code as per GPL version 2 + */ + +#include +#include +#include +#include +#include + +#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 ssize_t power_supply_show_property(struct device *dev, + struct device_attribute *attr, + char *buf) { + static char *type_text[] = { + "Unknown", "Battery", "UPS", "Mains", "USB", + "USB_DCP", "USB_CDP", "USB_ACA" + }; + static char *status_text[] = { + "Unknown", "Charging", "Discharging", "Not charging", "Full" + }; + static char *charge_type[] = { + "Unknown", "N/A", "Trickle", "Fast" + }; + static char *health_text[] = { + "Unknown", "Good", "Overheat", "Dead", "Over voltage", + "Unspecified failure", "Cold", "Watchdog timer expire", + "Safety timer expire" + }; + static char *technology_text[] = { + "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", + "LiMn" + }; + static char *capacity_level_text[] = { + "Unknown", "Critical", "Low", "Normal", "High", "Full" + }; + static char *scope_text[] = { + "Unknown", "System", "Device" + }; + 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) + 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", status_text[value.intval]); + else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) + return sprintf(buf, "%s\n", charge_type[value.intval]); + else if (off == POWER_SUPPLY_PROP_HEALTH) + return sprintf(buf, "%s\n", health_text[value.intval]); + else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) + return sprintf(buf, "%s\n", technology_text[value.intval]); + else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) + return sprintf(buf, "%s\n", capacity_level_text[value.intval]); + else if (off == POWER_SUPPLY_PROP_TYPE) + return sprintf(buf, "%s\n", type_text[value.intval]); + else if (off == POWER_SUPPLY_PROP_SCOPE) + return sprintf(buf, "%s\n", 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); +} + +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; + long long_val; + + /* TODO: support other types than int */ + ret = kstrtol(buf, 10, &long_val); + if (ret < 0) + return ret; + + value.intval = long_val; + + ret = psy->desc->set_property(psy, off, &value); + if (ret < 0) + return ret; + + 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(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(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 && + power_supply_property_is_writeable(psy, property) > 0) + mode |= S_IWUSR; + + return mode; + } + } + + return 0; +} + +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; +} + +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; +} + +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; +}