SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/power_supply.h>
  16
  17 #include "power_supply.h"
  18
  19 /*
  20  * This is because the name "current" breaks the device attr macro.
  21  * The "current" word resolves to "(get_current())" so instead of
  22  * "current" "(get_current())" appears in the sysfs.
  23  *
  24  * The source of this definition is the device.h which calls __ATTR
  25  * macro in sysfs.h which calls the __stringify macro.
  26  *
  27  * Only modification that the name is not tried to be resolved
  28  * (as a macro let's say).
  29  */
  30
  31 #define POWER_SUPPLY_ATTR(_name)                                        \
  32 {                                                                       \
  33         .attr = { .name = #_name, .mode = 0444 },       \
  34         .show = power_supply_show_property,                             \
  35         .store = NULL,                                                  \
  36 }
  37
  38 static struct device_attribute power_supply_attrs[];
  39
  40 static ssize_t power_supply_show_property(struct device *dev,
  41                                           struct device_attribute *attr,
  42                                           char *buf) {
  43         static char *status_text[] = {
  44                 "Unknown", "Charging", "Discharging", "Not charging", "Full"
  45         };
  46         static char *health_text[] = {
  47                 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
  48                 "Unspecified failure", "Cold",
  49         };
  50         static char *technology_text[] = {
  51                 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
  52                 "LiMn"
  53         };
  54         static char *capacity_level_text[] = {
  55                 "Unknown", "Critical", "Low", "Normal", "High", "Full"
  56         };
  57         ssize_t ret;
  58         struct power_supply *psy = dev_get_drvdata(dev);
  59         const ptrdiff_t off = attr - power_supply_attrs;
  60         union power_supply_propval value;
  61
  62         ret = psy->get_property(psy, off, &value);
  63
  64         if (ret < 0) {
  65                 if (ret != -ENODEV)
  66                         dev_err(dev, "driver failed to report `%s' property\n",
  67                                 attr->attr.name);
  68                 return ret;
  69         }
  70
  71         if (off == POWER_SUPPLY_PROP_STATUS)
  72                 return sprintf(buf, "%s\n", status_text[value.intval]);
  73         else if (off == POWER_SUPPLY_PROP_HEALTH)
  74                 return sprintf(buf, "%s\n", health_text[value.intval]);
  75         else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
  76                 return sprintf(buf, "%s\n", technology_text[value.intval]);
  77         else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
  78                 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
  79         else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
  80                 return sprintf(buf, "%s\n", value.strval);
  81
  82         return sprintf(buf, "%d\n", value.intval);
  83 }
  84
  85 /* Must be in the same order as POWER_SUPPLY_PROP_* */
  86 static struct device_attribute power_supply_attrs[] = {
  87         /* Properties of type `int' */
  88         POWER_SUPPLY_ATTR(status),
  89         POWER_SUPPLY_ATTR(health),
  90         POWER_SUPPLY_ATTR(present),
  91         POWER_SUPPLY_ATTR(online),
  92         POWER_SUPPLY_ATTR(technology),
  93         POWER_SUPPLY_ATTR(voltage_max),
  94         POWER_SUPPLY_ATTR(voltage_min),
  95         POWER_SUPPLY_ATTR(voltage_max_design),
  96         POWER_SUPPLY_ATTR(voltage_min_design),
  97         POWER_SUPPLY_ATTR(voltage_now),
  98         POWER_SUPPLY_ATTR(voltage_avg),
  99         POWER_SUPPLY_ATTR(current_now),
 100         POWER_SUPPLY_ATTR(current_avg),
 101         POWER_SUPPLY_ATTR(power_now),
 102         POWER_SUPPLY_ATTR(power_avg),
 103         POWER_SUPPLY_ATTR(charge_full_design),
 104         POWER_SUPPLY_ATTR(charge_empty_design),
 105         POWER_SUPPLY_ATTR(charge_full),
 106         POWER_SUPPLY_ATTR(charge_empty),
 107         POWER_SUPPLY_ATTR(charge_now),
 108         POWER_SUPPLY_ATTR(charge_avg),
 109         POWER_SUPPLY_ATTR(charge_counter),
 110         POWER_SUPPLY_ATTR(energy_full_design),
 111         POWER_SUPPLY_ATTR(energy_empty_design),
 112         POWER_SUPPLY_ATTR(energy_full),
 113         POWER_SUPPLY_ATTR(energy_empty),
 114         POWER_SUPPLY_ATTR(energy_now),
 115         POWER_SUPPLY_ATTR(energy_avg),
 116         POWER_SUPPLY_ATTR(capacity),
 117         POWER_SUPPLY_ATTR(capacity_level),
 118         POWER_SUPPLY_ATTR(temp),
 119         POWER_SUPPLY_ATTR(temp_ambient),
 120         POWER_SUPPLY_ATTR(time_to_empty_now),
 121         POWER_SUPPLY_ATTR(time_to_empty_avg),
 122         POWER_SUPPLY_ATTR(time_to_full_now),
 123         POWER_SUPPLY_ATTR(time_to_full_avg),
 124         /* Properties of type `const char *' */
 125         POWER_SUPPLY_ATTR(model_name),
 126         POWER_SUPPLY_ATTR(manufacturer),
 127         POWER_SUPPLY_ATTR(serial_number),
 128 };
 129
 130 static ssize_t power_supply_show_static_attrs(struct device *dev,
 131                                               struct device_attribute *attr,
 132                                               char *buf) {
 133         static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
 134         struct power_supply *psy = dev_get_drvdata(dev);
 135
 136         return sprintf(buf, "%s\n", type_text[psy->type]);
 137 }
 138
 139 static struct device_attribute power_supply_static_attrs[] = {
 140         __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
 141 };
 142
 143 int power_supply_create_attrs(struct power_supply *psy)
 144 {
 145         int rc = 0;
 146         int i, j;
 147
 148         for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
 149                 rc = device_create_file(psy->dev,
 150                             &power_supply_static_attrs[i]);
 151                 if (rc)
 152                         goto statics_failed;
 153         }
 154
 155         for (j = 0; j < psy->num_properties; j++) {
 156                 rc = device_create_file(psy->dev,
 157                             &power_supply_attrs[psy->properties[j]]);
 158                 if (rc)
 159                         goto dynamics_failed;
 160         }
 161
 162         goto succeed;
 163
 164 dynamics_failed:
 165         while (j--)
 166                 device_remove_file(psy->dev,
 167                            &power_supply_attrs[psy->properties[j]]);
 168 statics_failed:
 169         while (i--)
 170                 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
 171 succeed:
 172         return rc;
 173 }
 174
 175 void power_supply_remove_attrs(struct power_supply *psy)
 176 {
 177         int i;
 178
 179         for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
 180                 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
 181
 182         for (i = 0; i < psy->num_properties; i++)
 183                 device_remove_file(psy->dev,
 184                             &power_supply_attrs[psy->properties[i]]);
 185 }
 186
 187 static char *kstruprdup(const char *str, gfp_t gfp)
 188 {
 189         char *ret, *ustr;
 190
 191         ustr = ret = kmalloc(strlen(str) + 1, gfp);
 192
 193         if (!ret)
 194                 return NULL;
 195
 196         while (*str)
 197                 *ustr++ = toupper(*str++);
 198
 199         *ustr = 0;
 200
 201         return ret;
 202 }
 203
 204 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
 205 {
 206         struct power_supply *psy = dev_get_drvdata(dev);
 207         int ret = 0, j;
 208         char *prop_buf;
 209         char *attrname;
 210
 211         dev_dbg(dev, "uevent\n");
 212
 213         if (!psy || !psy->dev) {
 214                 dev_dbg(dev, "No power supply yet\n");
 215                 return ret;
 216         }
 217
 218         dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
 219
 220         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
 221         if (ret)
 222                 return ret;
 223
 224         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
 225         if (!prop_buf)
 226                 return -ENOMEM;
 227
 228         for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
 229                 struct device_attribute *attr;
 230                 char *line;
 231
 232                 attr = &power_supply_static_attrs[j];
 233
 234                 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
 235                 if (ret < 0)
 236                         goto out;
 237
 238                 line = strchr(prop_buf, '\n');
 239                 if (line)
 240                         *line = 0;
 241
 242                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
 243                 if (!attrname) {
 244                         ret = -ENOMEM;
 245                         goto out;
 246                 }
 247
 248                 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
 249
 250                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
 251                 kfree(attrname);
 252                 if (ret)
 253                         goto out;
 254         }
 255
 256         dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
 257
 258         for (j = 0; j < psy->num_properties; j++) {
 259                 struct device_attribute *attr;
 260                 char *line;
 261
 262                 attr = &power_supply_attrs[psy->properties[j]];
 263
 264                 ret = power_supply_show_property(dev, attr, prop_buf);
 265                 if (ret == -ENODEV) {
 266                         /* When a battery is absent, we expect -ENODEV. Don't abort;
 267                            send the uevent with at least the the PRESENT=0 property */
 268                         ret = 0;
 269                         continue;
 270                 }
 271
 272                 if (ret < 0)
 273                         goto out;
 274
 275                 line = strchr(prop_buf, '\n');
 276                 if (line)
 277                         *line = 0;
 278
 279                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
 280                 if (!attrname) {
 281                         ret = -ENOMEM;
 282                         goto out;
 283                 }
 284
 285                 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
 286
 287                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
 288                 kfree(attrname);
 289                 if (ret)
 290                         goto out;
 291         }
 292
 293 out:
 294         free_page((unsigned long)prop_buf);
 295
 296         return ret;
 297 }