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#include <linux/slab.h> 17 18#include "power_supply.h" 19 20/* 21 * This is because the name "current" breaks the device attr macro. 22 * The "current" word resolves to "(get_current())" so instead of 23 * "current" "(get_current())" appears in the sysfs. 24 * 25 * The source of this definition is the device.h which calls __ATTR 26 * macro in sysfs.h which calls the __stringify macro. 27 * 28 * Only modification that the name is not tried to be resolved 29 * (as a macro let's say). 30 */ 31 32#define POWER_SUPPLY_ATTR(_name) \ 33{ \ 34 .attr = { .name = #_name }, \ 35 .show = power_supply_show_property, \ 36 .store = power_supply_store_property, \ 37} 38 39static struct device_attribute power_supply_attrs[]; 40 41static ssize_t power_supply_show_property(struct device *dev, 42 struct device_attribute *attr, 43 char *buf) { 44 static char *type_text[] = { 45 "Battery", "UPS", "Mains", "USB" 46 }; 47 static char *status_text[] = { 48 "Unknown", "Charging", "Discharging", "Not charging", "Full" 49 }; 50 static char *charge_type[] = { 51 "Unknown", "N/A", "Trickle", "Fast" 52 }; 53 static char *health_text[] = { 54 "Unknown", "Good", "Overheat", "Dead", "Over voltage", 55 "Unspecified failure", "Cold", 56 }; 57 static char *technology_text[] = { 58 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", 59 "LiMn" 60 }; 61 static char *capacity_level_text[] = { 62 "Unknown", "Critical", "Low", "Normal", "High", "Full" 63 }; 64 ssize_t ret = 0; 65 struct power_supply *psy = dev_get_drvdata(dev); 66 const ptrdiff_t off = attr - power_supply_attrs; 67 union power_supply_propval value; 68 69 if (off == POWER_SUPPLY_PROP_TYPE) 70 value.intval = psy->type; 71 else 72 ret = psy->get_property(psy, off, &value); 73 74 if (ret < 0) { 75 if (ret == -ENODATA) 76 dev_dbg(dev, "driver has no data for `%s' property\n", 77 attr->attr.name); 78 else if (ret != -ENODEV) 79 dev_err(dev, "driver failed to report `%s' property\n", 80 attr->attr.name); 81 return ret; 82 } 83 84 if (off == POWER_SUPPLY_PROP_STATUS) 85 return sprintf(buf, "%s\n", status_text[value.intval]); 86 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) 87 return sprintf(buf, "%s\n", charge_type[value.intval]); 88 else if (off == POWER_SUPPLY_PROP_HEALTH) 89 return sprintf(buf, "%s\n", health_text[value.intval]); 90 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) 91 return sprintf(buf, "%s\n", technology_text[value.intval]); 92 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) 93 return sprintf(buf, "%s\n", capacity_level_text[value.intval]); 94 else if (off == POWER_SUPPLY_PROP_TYPE) 95 return sprintf(buf, "%s\n", type_text[value.intval]); 96 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) 97 return sprintf(buf, "%s\n", value.strval); 98 99 return sprintf(buf, "%d\n", value.intval); 100} 101 102static ssize_t power_supply_store_property(struct device *dev, 103 struct device_attribute *attr, 104 const char *buf, size_t count) { 105 ssize_t ret; 106 struct power_supply *psy = dev_get_drvdata(dev); 107 const ptrdiff_t off = attr - power_supply_attrs; 108 union power_supply_propval value; 109 long long_val; 110 111 /* TODO: support other types than int */ 112 ret = strict_strtol(buf, 10, &long_val); 113 if (ret < 0) 114 return ret; 115 116 value.intval = long_val; 117 118 ret = psy->set_property(psy, off, &value); 119 if (ret < 0) 120 return ret; 121 122 return count; 123} 124 125/* Must be in the same order as POWER_SUPPLY_PROP_* */ 126static struct device_attribute power_supply_attrs[] = { 127 /* Properties of type `int' */ 128 POWER_SUPPLY_ATTR(status), 129 POWER_SUPPLY_ATTR(charge_type), 130 POWER_SUPPLY_ATTR(health), 131 POWER_SUPPLY_ATTR(present), 132 POWER_SUPPLY_ATTR(online), 133 POWER_SUPPLY_ATTR(technology), 134 POWER_SUPPLY_ATTR(cycle_count), 135 POWER_SUPPLY_ATTR(voltage_max), 136 POWER_SUPPLY_ATTR(voltage_min), 137 POWER_SUPPLY_ATTR(voltage_max_design), 138 POWER_SUPPLY_ATTR(voltage_min_design), 139 POWER_SUPPLY_ATTR(voltage_now), 140 POWER_SUPPLY_ATTR(voltage_avg), 141 POWER_SUPPLY_ATTR(current_now), 142 POWER_SUPPLY_ATTR(current_avg), 143 POWER_SUPPLY_ATTR(power_now), 144 POWER_SUPPLY_ATTR(power_avg), 145 POWER_SUPPLY_ATTR(charge_full_design), 146 POWER_SUPPLY_ATTR(charge_empty_design), 147 POWER_SUPPLY_ATTR(charge_full), 148 POWER_SUPPLY_ATTR(charge_empty), 149 POWER_SUPPLY_ATTR(charge_now), 150 POWER_SUPPLY_ATTR(charge_avg), 151 POWER_SUPPLY_ATTR(charge_counter), 152 POWER_SUPPLY_ATTR(energy_full_design), 153 POWER_SUPPLY_ATTR(energy_empty_design), 154 POWER_SUPPLY_ATTR(energy_full), 155 POWER_SUPPLY_ATTR(energy_empty), 156 POWER_SUPPLY_ATTR(energy_now), 157 POWER_SUPPLY_ATTR(energy_avg), 158 POWER_SUPPLY_ATTR(capacity), 159 POWER_SUPPLY_ATTR(capacity_level), 160 POWER_SUPPLY_ATTR(temp), 161 POWER_SUPPLY_ATTR(temp_ambient), 162 POWER_SUPPLY_ATTR(time_to_empty_now), 163 POWER_SUPPLY_ATTR(time_to_empty_avg), 164 POWER_SUPPLY_ATTR(time_to_full_now), 165 POWER_SUPPLY_ATTR(time_to_full_avg), 166 POWER_SUPPLY_ATTR(type), 167 /* Properties of type `const char *' */ 168 POWER_SUPPLY_ATTR(model_name), 169 POWER_SUPPLY_ATTR(manufacturer), 170 POWER_SUPPLY_ATTR(serial_number), 171}; 172 173static struct attribute * 174__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 175 176static mode_t power_supply_attr_is_visible(struct kobject *kobj, 177 struct attribute *attr, 178 int attrno) 179{ 180 struct device *dev = container_of(kobj, struct device, kobj); 181 struct power_supply *psy = dev_get_drvdata(dev); 182 mode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 183 int i; 184 185 if (attrno == POWER_SUPPLY_PROP_TYPE) 186 return mode; 187 188 for (i = 0; i < psy->num_properties; i++) { 189 int property = psy->properties[i]; 190 191 if (property == attrno) { 192 if (psy->property_is_writeable && 193 psy->property_is_writeable(psy, property) > 0) 194 mode |= S_IWUSR; 195 196 return mode; 197 } 198 } 199 200 return 0; 201} 202 203static struct attribute_group power_supply_attr_group = { 204 .attrs = __power_supply_attrs, 205 .is_visible = power_supply_attr_is_visible, 206}; 207 208static const struct attribute_group *power_supply_attr_groups[] = { 209 &power_supply_attr_group, 210 NULL, 211}; 212 213void power_supply_init_attrs(struct device_type *dev_type) 214{ 215 int i; 216 217 dev_type->groups = power_supply_attr_groups; 218 219 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 220 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 221} 222 223static char *kstruprdup(const char *str, gfp_t gfp) 224{ 225 char *ret, *ustr; 226 227 ustr = ret = kmalloc(strlen(str) + 1, gfp); 228 229 if (!ret) 230 return NULL; 231 232 while (*str) 233 *ustr++ = toupper(*str++); 234 235 *ustr = 0; 236 237 return ret; 238} 239 240int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 241{ 242 struct power_supply *psy = dev_get_drvdata(dev); 243 int ret = 0, j; 244 char *prop_buf; 245 char *attrname; 246 247 dev_dbg(dev, "uevent\n"); 248 249 if (!psy || !psy->dev) { 250 dev_dbg(dev, "No power supply yet\n"); 251 return ret; 252 } 253 254 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); 255 256 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); 257 if (ret) 258 return ret; 259 260 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 261 if (!prop_buf) 262 return -ENOMEM; 263 264 for (j = 0; j < psy->num_properties; j++) { 265 struct device_attribute *attr; 266 char *line; 267 268 attr = &power_supply_attrs[psy->properties[j]]; 269 270 ret = power_supply_show_property(dev, attr, prop_buf); 271 if (ret == -ENODEV) { 272 /* When a battery is absent, we expect -ENODEV. Don't abort; 273 send the uevent with at least the the PRESENT=0 property */ 274 ret = 0; 275 continue; 276 } 277 278 if (ret < 0) 279 goto out; 280 281 line = strchr(prop_buf, '\n'); 282 if (line) 283 *line = 0; 284 285 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 286 if (!attrname) { 287 ret = -ENOMEM; 288 goto out; 289 } 290 291 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); 292 293 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 294 kfree(attrname); 295 if (ret) 296 goto out; 297 } 298 299out: 300 free_page((unsigned long)prop_buf); 301 302 return ret; 303} 304