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 const char * const power_supply_type_text[] = { 44 "Unknown", "Battery", "UPS", "Mains", "USB", 45 "USB_DCP", "USB_CDP", "USB_ACA", "USB_C", 46 "USB_PD", "USB_PD_DRP", "BrickID" 47 }; 48 49 static const char * const power_supply_usb_type_text[] = { 50 "Unknown", "SDP", "DCP", "CDP", "ACA", "C", 51 "PD", "PD_DRP", "PD_PPS", "BrickID" 52 }; 53 54 static const char * const power_supply_status_text[] = { 55 "Unknown", "Charging", "Discharging", "Not charging", "Full" 56 }; 57 58 static const char * const power_supply_charge_type_text[] = { 59 "Unknown", "N/A", "Trickle", "Fast" 60 }; 61 62 static const char * const power_supply_health_text[] = { 63 "Unknown", "Good", "Overheat", "Dead", "Over voltage", 64 "Unspecified failure", "Cold", "Watchdog timer expire", 65 "Safety timer expire" 66 }; 67 68 static const char * const power_supply_technology_text[] = { 69 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", 70 "LiMn" 71 }; 72 73 static const char * const power_supply_capacity_level_text[] = { 74 "Unknown", "Critical", "Low", "Normal", "High", "Full" 75 }; 76 77 static const char * const power_supply_scope_text[] = { 78 "Unknown", "System", "Device" 79 }; 80 81 static ssize_t power_supply_show_usb_type(struct device *dev, 82 enum power_supply_usb_type *usb_types, 83 ssize_t num_usb_types, 84 union power_supply_propval *value, 85 char *buf) 86 { 87 enum power_supply_usb_type usb_type; 88 ssize_t count = 0; 89 bool match = false; 90 int i; 91 92 for (i = 0; i < num_usb_types; ++i) { 93 usb_type = usb_types[i]; 94 95 if (value->intval == usb_type) { 96 count += sprintf(buf + count, "[%s] ", 97 power_supply_usb_type_text[usb_type]); 98 match = true; 99 } else { 100 count += sprintf(buf + count, "%s ", 101 power_supply_usb_type_text[usb_type]); 102 } 103 } 104 105 if (!match) { 106 dev_warn(dev, "driver reporting unsupported connected type\n"); 107 return -EINVAL; 108 } 109 110 if (count) 111 buf[count - 1] = '\n'; 112 113 return count; 114 } 115 116 static ssize_t power_supply_show_property(struct device *dev, 117 struct device_attribute *attr, 118 char *buf) { 119 ssize_t ret; 120 struct power_supply *psy = dev_get_drvdata(dev); 121 enum power_supply_property psp = attr - power_supply_attrs; 122 union power_supply_propval value; 123 124 if (psp == POWER_SUPPLY_PROP_TYPE) { 125 value.intval = psy->desc->type; 126 } else { 127 ret = power_supply_get_property(psy, psp, &value); 128 129 if (ret < 0) { 130 if (ret == -ENODATA) 131 dev_dbg(dev, "driver has no data for `%s' property\n", 132 attr->attr.name); 133 else if (ret != -ENODEV && ret != -EAGAIN) 134 dev_err(dev, "driver failed to report `%s' property: %zd\n", 135 attr->attr.name, ret); 136 return ret; 137 } 138 } 139 140 switch (psp) { 141 case POWER_SUPPLY_PROP_STATUS: 142 ret = sprintf(buf, "%s\n", 143 power_supply_status_text[value.intval]); 144 break; 145 case POWER_SUPPLY_PROP_CHARGE_TYPE: 146 ret = sprintf(buf, "%s\n", 147 power_supply_charge_type_text[value.intval]); 148 break; 149 case POWER_SUPPLY_PROP_HEALTH: 150 ret = sprintf(buf, "%s\n", 151 power_supply_health_text[value.intval]); 152 break; 153 case POWER_SUPPLY_PROP_TECHNOLOGY: 154 ret = sprintf(buf, "%s\n", 155 power_supply_technology_text[value.intval]); 156 break; 157 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 158 ret = sprintf(buf, "%s\n", 159 power_supply_capacity_level_text[value.intval]); 160 break; 161 case POWER_SUPPLY_PROP_TYPE: 162 ret = sprintf(buf, "%s\n", 163 power_supply_type_text[value.intval]); 164 break; 165 case POWER_SUPPLY_PROP_USB_TYPE: 166 ret = power_supply_show_usb_type(dev, psy->desc->usb_types, 167 psy->desc->num_usb_types, 168 &value, buf); 169 break; 170 case POWER_SUPPLY_PROP_SCOPE: 171 ret = sprintf(buf, "%s\n", 172 power_supply_scope_text[value.intval]); 173 break; 174 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 175 ret = sprintf(buf, "%s\n", value.strval); 176 break; 177 default: 178 ret = sprintf(buf, "%d\n", value.intval); 179 } 180 181 return ret; 182 } 183 184 static ssize_t power_supply_store_property(struct device *dev, 185 struct device_attribute *attr, 186 const char *buf, size_t count) { 187 ssize_t ret; 188 struct power_supply *psy = dev_get_drvdata(dev); 189 enum power_supply_property psp = attr - power_supply_attrs; 190 union power_supply_propval value; 191 192 switch (psp) { 193 case POWER_SUPPLY_PROP_STATUS: 194 ret = sysfs_match_string(power_supply_status_text, buf); 195 break; 196 case POWER_SUPPLY_PROP_CHARGE_TYPE: 197 ret = sysfs_match_string(power_supply_charge_type_text, buf); 198 break; 199 case POWER_SUPPLY_PROP_HEALTH: 200 ret = sysfs_match_string(power_supply_health_text, buf); 201 break; 202 case POWER_SUPPLY_PROP_TECHNOLOGY: 203 ret = sysfs_match_string(power_supply_technology_text, buf); 204 break; 205 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 206 ret = sysfs_match_string(power_supply_capacity_level_text, buf); 207 break; 208 case POWER_SUPPLY_PROP_SCOPE: 209 ret = sysfs_match_string(power_supply_scope_text, buf); 210 break; 211 default: 212 ret = -EINVAL; 213 } 214 215 /* 216 * If no match was found, then check to see if it is an integer. 217 * Integer values are valid for enums in addition to the text value. 218 */ 219 if (ret < 0) { 220 long long_val; 221 222 ret = kstrtol(buf, 10, &long_val); 223 if (ret < 0) 224 return ret; 225 226 ret = long_val; 227 } 228 229 value.intval = ret; 230 231 ret = power_supply_set_property(psy, psp, &value); 232 if (ret < 0) 233 return ret; 234 235 return count; 236 } 237 238 /* Must be in the same order as POWER_SUPPLY_PROP_* */ 239 static struct device_attribute power_supply_attrs[] = { 240 /* Properties of type `int' */ 241 POWER_SUPPLY_ATTR(status), 242 POWER_SUPPLY_ATTR(charge_type), 243 POWER_SUPPLY_ATTR(health), 244 POWER_SUPPLY_ATTR(present), 245 POWER_SUPPLY_ATTR(online), 246 POWER_SUPPLY_ATTR(authentic), 247 POWER_SUPPLY_ATTR(technology), 248 POWER_SUPPLY_ATTR(cycle_count), 249 POWER_SUPPLY_ATTR(voltage_max), 250 POWER_SUPPLY_ATTR(voltage_min), 251 POWER_SUPPLY_ATTR(voltage_max_design), 252 POWER_SUPPLY_ATTR(voltage_min_design), 253 POWER_SUPPLY_ATTR(voltage_now), 254 POWER_SUPPLY_ATTR(voltage_avg), 255 POWER_SUPPLY_ATTR(voltage_ocv), 256 POWER_SUPPLY_ATTR(voltage_boot), 257 POWER_SUPPLY_ATTR(current_max), 258 POWER_SUPPLY_ATTR(current_now), 259 POWER_SUPPLY_ATTR(current_avg), 260 POWER_SUPPLY_ATTR(current_boot), 261 POWER_SUPPLY_ATTR(power_now), 262 POWER_SUPPLY_ATTR(power_avg), 263 POWER_SUPPLY_ATTR(charge_full_design), 264 POWER_SUPPLY_ATTR(charge_empty_design), 265 POWER_SUPPLY_ATTR(charge_full), 266 POWER_SUPPLY_ATTR(charge_empty), 267 POWER_SUPPLY_ATTR(charge_now), 268 POWER_SUPPLY_ATTR(charge_avg), 269 POWER_SUPPLY_ATTR(charge_counter), 270 POWER_SUPPLY_ATTR(constant_charge_current), 271 POWER_SUPPLY_ATTR(constant_charge_current_max), 272 POWER_SUPPLY_ATTR(constant_charge_voltage), 273 POWER_SUPPLY_ATTR(constant_charge_voltage_max), 274 POWER_SUPPLY_ATTR(charge_control_limit), 275 POWER_SUPPLY_ATTR(charge_control_limit_max), 276 POWER_SUPPLY_ATTR(input_current_limit), 277 POWER_SUPPLY_ATTR(energy_full_design), 278 POWER_SUPPLY_ATTR(energy_empty_design), 279 POWER_SUPPLY_ATTR(energy_full), 280 POWER_SUPPLY_ATTR(energy_empty), 281 POWER_SUPPLY_ATTR(energy_now), 282 POWER_SUPPLY_ATTR(energy_avg), 283 POWER_SUPPLY_ATTR(capacity), 284 POWER_SUPPLY_ATTR(capacity_alert_min), 285 POWER_SUPPLY_ATTR(capacity_alert_max), 286 POWER_SUPPLY_ATTR(capacity_level), 287 POWER_SUPPLY_ATTR(temp), 288 POWER_SUPPLY_ATTR(temp_max), 289 POWER_SUPPLY_ATTR(temp_min), 290 POWER_SUPPLY_ATTR(temp_alert_min), 291 POWER_SUPPLY_ATTR(temp_alert_max), 292 POWER_SUPPLY_ATTR(temp_ambient), 293 POWER_SUPPLY_ATTR(temp_ambient_alert_min), 294 POWER_SUPPLY_ATTR(temp_ambient_alert_max), 295 POWER_SUPPLY_ATTR(time_to_empty_now), 296 POWER_SUPPLY_ATTR(time_to_empty_avg), 297 POWER_SUPPLY_ATTR(time_to_full_now), 298 POWER_SUPPLY_ATTR(time_to_full_avg), 299 POWER_SUPPLY_ATTR(type), 300 POWER_SUPPLY_ATTR(usb_type), 301 POWER_SUPPLY_ATTR(scope), 302 POWER_SUPPLY_ATTR(precharge_current), 303 POWER_SUPPLY_ATTR(charge_term_current), 304 POWER_SUPPLY_ATTR(calibrate), 305 /* Properties of type `const char *' */ 306 POWER_SUPPLY_ATTR(model_name), 307 POWER_SUPPLY_ATTR(manufacturer), 308 POWER_SUPPLY_ATTR(serial_number), 309 }; 310 311 static struct attribute * 312 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 313 314 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 315 struct attribute *attr, 316 int attrno) 317 { 318 struct device *dev = container_of(kobj, struct device, kobj); 319 struct power_supply *psy = dev_get_drvdata(dev); 320 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 321 int i; 322 323 if (attrno == POWER_SUPPLY_PROP_TYPE) 324 return mode; 325 326 for (i = 0; i < psy->desc->num_properties; i++) { 327 int property = psy->desc->properties[i]; 328 329 if (property == attrno) { 330 if (psy->desc->property_is_writeable && 331 psy->desc->property_is_writeable(psy, property) > 0) 332 mode |= S_IWUSR; 333 334 return mode; 335 } 336 } 337 338 return 0; 339 } 340 341 static struct attribute_group power_supply_attr_group = { 342 .attrs = __power_supply_attrs, 343 .is_visible = power_supply_attr_is_visible, 344 }; 345 346 static const struct attribute_group *power_supply_attr_groups[] = { 347 &power_supply_attr_group, 348 NULL, 349 }; 350 351 void power_supply_init_attrs(struct device_type *dev_type) 352 { 353 int i; 354 355 dev_type->groups = power_supply_attr_groups; 356 357 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 358 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 359 } 360 361 static char *kstruprdup(const char *str, gfp_t gfp) 362 { 363 char *ret, *ustr; 364 365 ustr = ret = kmalloc(strlen(str) + 1, gfp); 366 367 if (!ret) 368 return NULL; 369 370 while (*str) 371 *ustr++ = toupper(*str++); 372 373 *ustr = 0; 374 375 return ret; 376 } 377 378 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 379 { 380 struct power_supply *psy = dev_get_drvdata(dev); 381 int ret = 0, j; 382 char *prop_buf; 383 char *attrname; 384 385 dev_dbg(dev, "uevent\n"); 386 387 if (!psy || !psy->desc) { 388 dev_dbg(dev, "No power supply yet\n"); 389 return ret; 390 } 391 392 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name); 393 394 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 395 if (ret) 396 return ret; 397 398 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 399 if (!prop_buf) 400 return -ENOMEM; 401 402 for (j = 0; j < psy->desc->num_properties; j++) { 403 struct device_attribute *attr; 404 char *line; 405 406 attr = &power_supply_attrs[psy->desc->properties[j]]; 407 408 ret = power_supply_show_property(dev, attr, prop_buf); 409 if (ret == -ENODEV || ret == -ENODATA) { 410 /* When a battery is absent, we expect -ENODEV. Don't abort; 411 send the uevent with at least the the PRESENT=0 property */ 412 ret = 0; 413 continue; 414 } 415 416 if (ret < 0) 417 goto out; 418 419 line = strchr(prop_buf, '\n'); 420 if (line) 421 *line = 0; 422 423 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 424 if (!attrname) { 425 ret = -ENOMEM; 426 goto out; 427 } 428 429 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); 430 431 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 432 kfree(attrname); 433 if (ret) 434 goto out; 435 } 436 437 out: 438 free_page((unsigned long)prop_buf); 439 440 return ret; 441 } 442