drivers/power/power_supply_sysfs.c

   1 /*
   2  *  Sysfs interface for the universal power supply monitor class
   3  *
   4  *  Copyright © 2007  David Woodhouse <dwmw2@infradead.org>
   5  *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   6  *  Copyright © 2004  Szabolcs Gyurko
   7  *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   8  *
   9  *  Modified: 2004, Oct     Szabolcs Gyurko
  10  *
  11  *  You may use this code as per GPL version 2
  12  */
  13
  14 #include <linux/ctype.h>
  15 #include <linux/device.h>
  16 #include <linux/power_supply.h>
  17 #include <linux/slab.h>
  18 #include <linux/stat.h>
  19
  20 #include "power_supply.h"
  21
  22 /*
  23  * This is because the name "current" breaks the device attr macro.
  24  * The "current" word resolves to "(get_current())" so instead of
  25  * "current" "(get_current())" appears in the sysfs.
  26  *
  27  * The source of this definition is the device.h which calls __ATTR
  28  * macro in sysfs.h which calls the __stringify macro.
  29  *
  30  * Only modification that the name is not tried to be resolved
  31  * (as a macro let's say).
  32  */
  33
  34 #define POWER_SUPPLY_ATTR(_name)                                        \
  35 {                                                                       \
  36         .attr = { .name = #_name },                                     \
  37         .show = power_supply_show_property,                             \
  38         .store = power_supply_store_property,                           \
  39 }
  40
  41 static struct device_attribute power_supply_attrs[];
  42
  43 static ssize_t power_supply_show_property(struct device *dev,
  44                                           struct device_attribute *attr,
  45                                           char *buf) {
  46         static char *type_text[] = {
  47                 "Unknown", "Battery", "UPS", "Mains", "USB",
  48                 "USB_DCP", "USB_CDP", "USB_ACA", "Wireless"
  49         };
  50         static char *status_text[] = {
  51                 "Unknown", "Charging", "Discharging", "Not charging", "Full", "Cmd discharging"
  52         };
  53         static char *charge_type[] = {
  54                 "Unknown", "N/A", "Trickle", "Fast"
  55         };
  56         static char *health_text[] = {
  57                 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
  58                 "Unspecified failure", "Cold", "Watchdog timer expire",
  59                 "Safety timer expire"
  60         };
  61         static char *technology_text[] = {
  62                 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
  63                 "LiMn"
  64         };
  65         static char *capacity_level_text[] = {
  66                 "Unknown", "Critical", "Low", "Normal", "High", "Full"
  67         };
  68         static char *scope_text[] = {
  69                 "Unknown", "System", "Device"
  70         };
  71         ssize_t ret = 0;
  72         struct power_supply *psy = dev_get_drvdata(dev);
  73         const ptrdiff_t off = attr - power_supply_attrs;
  74         union power_supply_propval value;
  75
  76         if (off == POWER_SUPPLY_PROP_TYPE)
  77                 value.intval = psy->type;
  78         else
  79                 ret = psy->get_property(psy, off, &value);
  80
  81         if (ret < 0) {
  82                 if (ret == -ENODATA)
  83                         dev_dbg(dev, "driver has no data for `%s' property\n",
  84                                 attr->attr.name);
  85                 else if (ret != -ENODEV)
  86                         dev_err(dev, "driver failed to report `%s' property: %zd\n",
  87                                 attr->attr.name, ret);
  88                 return ret;
  89         }
  90
  91         if (off == POWER_SUPPLY_PROP_STATUS)
  92                 return sprintf(buf, "%s\n", status_text[value.intval]);
  93         else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
  94                 return sprintf(buf, "%s\n", charge_type[value.intval]);
  95         else if (off == POWER_SUPPLY_PROP_HEALTH)
  96                 return sprintf(buf, "%s\n", health_text[value.intval]);
  97         else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
  98                 return sprintf(buf, "%s\n", technology_text[value.intval]);
  99         else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
 100                 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
 101         else if (off == POWER_SUPPLY_PROP_TYPE)
 102                 return sprintf(buf, "%s\n", type_text[value.intval]);
 103         else if (off == POWER_SUPPLY_PROP_SCOPE)
 104                 return sprintf(buf, "%s\n", scope_text[value.intval]);
 105         else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
 106                 return sprintf(buf, "%s\n", value.strval);
 107         else if (off == POWER_SUPPLY_PROP_status_smb)
 108                 return sprintf(buf, "%s\n", status_text[value.intval]);
 109
 110         if (off == POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT)
 111                 return sprintf(buf, "%lld\n", value.int64val);
 112         else
 113                 return sprintf(buf, "%d\n", value.intval);
 114 }
 115
 116 static ssize_t power_supply_store_property(struct device *dev,
 117                                            struct device_attribute *attr,
 118                                            const char *buf, size_t count) {
 119         ssize_t ret;
 120         struct power_supply *psy = dev_get_drvdata(dev);
 121         const ptrdiff_t off = attr - power_supply_attrs;
 122         union power_supply_propval value;
 123         long long_val;
 124
 125         /* TODO: support other types than int */
 126         ret = strict_strtol(buf, 10, &long_val);
 127         if (ret < 0)
 128                 return ret;
 129
 130         value.intval = long_val;
 131
 132         ret = psy->set_property(psy, off, &value);
 133         if (ret < 0)
 134                 return ret;
 135
 136         return count;
 137 }
 138
 139 /* Must be in the same order as POWER_SUPPLY_PROP_* */
 140 static struct device_attribute power_supply_attrs[] = {
 141         /* Properties of type `int' */
 142         POWER_SUPPLY_ATTR(status),
 143         POWER_SUPPLY_ATTR(charge_type),
 144         POWER_SUPPLY_ATTR(health),
 145         POWER_SUPPLY_ATTR(present),
 146         POWER_SUPPLY_ATTR(online),
 147         POWER_SUPPLY_ATTR(authentic),
 148         POWER_SUPPLY_ATTR(technology),
 149         POWER_SUPPLY_ATTR(cycle_count),
 150         POWER_SUPPLY_ATTR(voltage_max),
 151         POWER_SUPPLY_ATTR(voltage_min),
 152         POWER_SUPPLY_ATTR(voltage_max_design),
 153         POWER_SUPPLY_ATTR(voltage_min_design),
 154         POWER_SUPPLY_ATTR(voltage_now),
 155         POWER_SUPPLY_ATTR(voltage_avg),
 156         POWER_SUPPLY_ATTR(voltage_ocv),
 157         POWER_SUPPLY_ATTR(current_max),
 158         POWER_SUPPLY_ATTR(current_now),
 159         POWER_SUPPLY_ATTR(current_avg),
 160         POWER_SUPPLY_ATTR(power_now),
 161         POWER_SUPPLY_ATTR(power_avg),
 162         POWER_SUPPLY_ATTR(charge_full_design),
 163         POWER_SUPPLY_ATTR(charge_empty_design),
 164         POWER_SUPPLY_ATTR(charge_full),
 165         POWER_SUPPLY_ATTR(charge_empty),
 166         POWER_SUPPLY_ATTR(charge_now),
 167         POWER_SUPPLY_ATTR(charge_avg),
 168         POWER_SUPPLY_ATTR(charge_counter),
 169         POWER_SUPPLY_ATTR(constant_charge_current),
 170         POWER_SUPPLY_ATTR(constant_charge_current_max),
 171         POWER_SUPPLY_ATTR(constant_charge_voltage),
 172         POWER_SUPPLY_ATTR(constant_charge_voltage_max),
 173         POWER_SUPPLY_ATTR(charge_control_limit),
 174         POWER_SUPPLY_ATTR(charge_control_limit_max),
 175         POWER_SUPPLY_ATTR(energy_full_design),
 176         POWER_SUPPLY_ATTR(energy_empty_design),
 177         POWER_SUPPLY_ATTR(energy_full),
 178         POWER_SUPPLY_ATTR(energy_empty),
 179         POWER_SUPPLY_ATTR(energy_now),
 180         POWER_SUPPLY_ATTR(energy_avg),
 181         POWER_SUPPLY_ATTR(capacity),
 182         POWER_SUPPLY_ATTR(capacity_alert_min),
 183         POWER_SUPPLY_ATTR(capacity_alert_max),
 184         POWER_SUPPLY_ATTR(capacity_level),
 185         POWER_SUPPLY_ATTR(temp),
 186         POWER_SUPPLY_ATTR(temp_alert_min),
 187         POWER_SUPPLY_ATTR(temp_alert_max),
 188         POWER_SUPPLY_ATTR(temp_ambient),
 189         POWER_SUPPLY_ATTR(temp_ambient_alert_min),
 190         POWER_SUPPLY_ATTR(temp_ambient_alert_max),
 191         POWER_SUPPLY_ATTR(time_to_empty_now),
 192         POWER_SUPPLY_ATTR(time_to_empty_avg),
 193         POWER_SUPPLY_ATTR(time_to_full_now),
 194         POWER_SUPPLY_ATTR(time_to_full_avg),
 195         POWER_SUPPLY_ATTR(type),
 196         POWER_SUPPLY_ATTR(scope),
 197         /* Local extensions */
 198         POWER_SUPPLY_ATTR(usb_hc),
 199         POWER_SUPPLY_ATTR(usb_otg),
 200         POWER_SUPPLY_ATTR(charge_enabled),
 201         /* Local extensions of type int64_t */
 202         POWER_SUPPLY_ATTR(charge_counter_ext),
 203         /* 20100723 James Lo */
 204         POWER_SUPPLY_ATTR(batt_vol),
 205         POWER_SUPPLY_ATTR(batt_temp),
 206         /* 20100405 Add for EM */
 207         POWER_SUPPLY_ATTR(TemperatureR),
 208         POWER_SUPPLY_ATTR(TempBattVoltage),
 209         POWER_SUPPLY_ATTR(InstatVolt),
 210         POWER_SUPPLY_ATTR(BatteryAverageCurrent),
 211         POWER_SUPPLY_ATTR(BatterySenseVoltage),
 212         POWER_SUPPLY_ATTR(ISenseVoltage),
 213         POWER_SUPPLY_ATTR(ChargerVoltage),
 214         /* Dual battery */
 215         POWER_SUPPLY_ATTR(status_smb),
 216         POWER_SUPPLY_ATTR(capacity_smb),
 217         POWER_SUPPLY_ATTR(present_smb),
 218         /* ADB CMD Discharging */
 219         POWER_SUPPLY_ATTR(adjust_power),
 220         /* Properties of type `const char *' */
 221         POWER_SUPPLY_ATTR(model_name),
 222         POWER_SUPPLY_ATTR(manufacturer),
 223         POWER_SUPPLY_ATTR(serial_number),
 224 };
 225
 226 static struct attribute *
 227 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
 228
 229 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
 230                                            struct attribute *attr,
 231                                            int attrno)
 232 {
 233         struct device *dev = container_of(kobj, struct device, kobj);
 234         struct power_supply *psy = dev_get_drvdata(dev);
 235         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 236         int i;
 237
 238         if (attrno == POWER_SUPPLY_PROP_TYPE)
 239                 return mode;
 240
 241         for (i = 0; i < psy->num_properties; i++) {
 242                 int property = psy->properties[i];
 243
 244                 if (property == attrno) {
 245                         if (psy->property_is_writeable &&
 246                             psy->property_is_writeable(psy, property) > 0)
 247                                 mode |= S_IWUSR;
 248
 249                         return mode;
 250                 }
 251         }
 252
 253         return 0;
 254 }
 255
 256 static struct attribute_group power_supply_attr_group = {
 257         .attrs = __power_supply_attrs,
 258         .is_visible = power_supply_attr_is_visible,
 259 };
 260
 261 static const struct attribute_group *power_supply_attr_groups[] = {
 262         &power_supply_attr_group,
 263         NULL,
 264 };
 265
 266 void power_supply_init_attrs(struct device_type *dev_type)
 267 {
 268         int i;
 269
 270         dev_type->groups = power_supply_attr_groups;
 271
 272         for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
 273                 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
 274 }
 275
 276 static char *kstruprdup(const char *str, gfp_t gfp)
 277 {
 278         char *ret, *ustr;
 279
 280         ustr = ret = kmalloc(strlen(str) + 1, gfp);
 281
 282         if (!ret)
 283                 return NULL;
 284
 285         while (*str)
 286                 *ustr++ = toupper(*str++);
 287
 288         *ustr = 0;
 289
 290         return ret;
 291 }
 292
 293 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
 294 {
 295         struct power_supply *psy = dev_get_drvdata(dev);
 296         int ret = 0, j;
 297         char *prop_buf;
 298         char *attrname;
 299
 300         dev_dbg(dev, "uevent\n");
 301
 302         if (!psy || !psy->dev) {
 303                 dev_dbg(dev, "No power supply yet\n");
 304                 return ret;
 305         }
 306
 307         dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
 308
 309         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
 310         if (ret)
 311                 return ret;
 312
 313         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
 314         if (!prop_buf)
 315                 return -ENOMEM;
 316
 317         for (j = 0; j < psy->num_properties; j++) {
 318                 struct device_attribute *attr;
 319                 char *line;
 320
 321                 attr = &power_supply_attrs[psy->properties[j]];
 322
 323                 ret = power_supply_show_property(dev, attr, prop_buf);
 324                 if (ret == -ENODEV || ret == -ENODATA) {
 325                         /* When a battery is absent, we expect -ENODEV. Don't abort;
 326                            send the uevent with at least the the PRESENT=0 property */
 327                         ret = 0;
 328                         continue;
 329                 }
 330
 331                 if (ret < 0)
 332                         goto out;
 333
 334                 line = strchr(prop_buf, '\n');
 335                 if (line)
 336                         *line = 0;
 337
 338                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
 339                 if (!attrname) {
 340                         ret = -ENOMEM;
 341                         goto out;
 342                 }
 343
 344                 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
 345
 346                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
 347                 kfree(attrname);
 348                 if (ret)
 349                         goto out;
 350         }
 351
 352 out:
 353         free_page((unsigned long)prop_buf);
 354
 355         return ret;
 356 }