/* * 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/power_supply.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, .mode = 0444, .owner = THIS_MODULE }, \ .show = power_supply_show_property, \ .store = NULL, \ } 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 *status_text[] = { "Unknown", "Charging", "Discharging", "Not charging", "Full" }; static char *health_text[] = { "Unknown", "Good", "Overheat", "Dead", "Over voltage", "Unspecified failure" }; static char *technology_text[] = { "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", "LiMn" }; ssize_t ret; struct power_supply *psy = dev_get_drvdata(dev); const ptrdiff_t off = attr - power_supply_attrs; union power_supply_propval value; ret = psy->get_property(psy, off, &value); if (ret < 0) { if (ret != -ENODEV) dev_err(dev, "driver failed to report `%s' property\n", attr->attr.name); return ret; } if (off == POWER_SUPPLY_PROP_STATUS) return sprintf(buf, "%s\n", status_text[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_MODEL_NAME) return sprintf(buf, "%s\n", value.strval); return sprintf(buf, "%d\n", value.intval); } /* 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(health), POWER_SUPPLY_ATTR(present), POWER_SUPPLY_ATTR(online), POWER_SUPPLY_ATTR(technology), 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(current_now), POWER_SUPPLY_ATTR(current_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(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(temp), POWER_SUPPLY_ATTR(temp_ambient), 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), /* Properties of type `const char *' */ POWER_SUPPLY_ATTR(model_name), POWER_SUPPLY_ATTR(manufacturer), POWER_SUPPLY_ATTR(serial_number), }; static ssize_t power_supply_show_static_attrs(struct device *dev, struct device_attribute *attr, char *buf) { static char *type_text[] = { "Battery", "UPS", "Mains", "USB" }; struct power_supply *psy = dev_get_drvdata(dev); return sprintf(buf, "%s\n", type_text[psy->type]); } static struct device_attribute power_supply_static_attrs[] = { __ATTR(type, 0444, power_supply_show_static_attrs, NULL), }; int power_supply_create_attrs(struct power_supply *psy) { int rc = 0; int i, j; for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) { rc = device_create_file(psy->dev, &power_supply_static_attrs[i]); if (rc) goto statics_failed; } for (j = 0; j < psy->num_properties; j++) { rc = device_create_file(psy->dev, &power_supply_attrs[psy->properties[j]]); if (rc) goto dynamics_failed; } goto succeed; dynamics_failed: while (j--) device_remove_file(psy->dev, &power_supply_attrs[psy->properties[j]]); statics_failed: while (i--) device_remove_file(psy->dev, &power_supply_static_attrs[i]); succeed: return rc; } void power_supply_remove_attrs(struct power_supply *psy) { int i; for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) device_remove_file(psy->dev, &power_supply_static_attrs[i]); for (i = 0; i < psy->num_properties; i++) device_remove_file(psy->dev, &power_supply_attrs[psy->properties[i]]); } 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) { dev_dbg(dev, "No power supply yet\n"); return ret; } dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); if (ret) return ret; prop_buf = (char *)get_zeroed_page(GFP_KERNEL); if (!prop_buf) return -ENOMEM; for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) { struct device_attribute *attr; char *line; attr = &power_supply_static_attrs[j]; ret = power_supply_show_static_attrs(dev, attr, prop_buf); 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, "Static 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; } dev_dbg(dev, "%zd dynamic props\n", psy->num_properties); for (j = 0; j < psy->num_properties; j++) { struct device_attribute *attr; char *line; attr = &power_supply_attrs[psy->properties[j]]; ret = power_supply_show_property(dev, attr, prop_buf); if (ret == -ENODEV) { /* 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; }