| /* |
| * 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), |
| }; |
| |
| 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; |
| } |