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 = 0; 120 struct power_supply *psy = dev_get_drvdata(dev); 121 const ptrdiff_t off = attr - power_supply_attrs; 122 union power_supply_propval value; 123 124 if (off == POWER_SUPPLY_PROP_TYPE) { 125 value.intval = psy->desc->type; 126 } else { 127 ret = power_supply_get_property(psy, off, &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 if (off == POWER_SUPPLY_PROP_STATUS) 141 return sprintf(buf, "%s\n", 142 power_supply_status_text[value.intval]); 143 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) 144 return sprintf(buf, "%s\n", 145 power_supply_charge_type_text[value.intval]); 146 else if (off == POWER_SUPPLY_PROP_HEALTH) 147 return sprintf(buf, "%s\n", 148 power_supply_health_text[value.intval]); 149 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) 150 return sprintf(buf, "%s\n", 151 power_supply_technology_text[value.intval]); 152 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) 153 return sprintf(buf, "%s\n", 154 power_supply_capacity_level_text[value.intval]); 155 else if (off == POWER_SUPPLY_PROP_TYPE) 156 return sprintf(buf, "%s\n", 157 power_supply_type_text[value.intval]); 158 else if (off == POWER_SUPPLY_PROP_USB_TYPE) 159 return power_supply_show_usb_type(dev, psy->desc->usb_types, 160 psy->desc->num_usb_types, 161 &value, buf); 162 else if (off == POWER_SUPPLY_PROP_SCOPE) 163 return sprintf(buf, "%s\n", 164 power_supply_scope_text[value.intval]); 165 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) 166 return sprintf(buf, "%s\n", value.strval); 167 168 return sprintf(buf, "%d\n", value.intval); 169 } 170 171 static ssize_t power_supply_store_property(struct device *dev, 172 struct device_attribute *attr, 173 const char *buf, size_t count) { 174 ssize_t ret; 175 struct power_supply *psy = dev_get_drvdata(dev); 176 const ptrdiff_t off = attr - power_supply_attrs; 177 union power_supply_propval value; 178 179 /* maybe it is a enum property? */ 180 switch (off) { 181 case POWER_SUPPLY_PROP_STATUS: 182 ret = sysfs_match_string(power_supply_status_text, buf); 183 break; 184 case POWER_SUPPLY_PROP_CHARGE_TYPE: 185 ret = sysfs_match_string(power_supply_charge_type_text, buf); 186 break; 187 case POWER_SUPPLY_PROP_HEALTH: 188 ret = sysfs_match_string(power_supply_health_text, buf); 189 break; 190 case POWER_SUPPLY_PROP_TECHNOLOGY: 191 ret = sysfs_match_string(power_supply_technology_text, buf); 192 break; 193 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 194 ret = sysfs_match_string(power_supply_capacity_level_text, buf); 195 break; 196 case POWER_SUPPLY_PROP_SCOPE: 197 ret = sysfs_match_string(power_supply_scope_text, buf); 198 break; 199 default: 200 ret = -EINVAL; 201 } 202 203 /* 204 * If no match was found, then check to see if it is an integer. 205 * Integer values are valid for enums in addition to the text value. 206 */ 207 if (ret < 0) { 208 long long_val; 209 210 ret = kstrtol(buf, 10, &long_val); 211 if (ret < 0) 212 return ret; 213 214 ret = long_val; 215 } 216 217 value.intval = ret; 218 219 ret = power_supply_set_property(psy, off, &value); 220 if (ret < 0) 221 return ret; 222 223 return count; 224 } 225 226 /* Must be in the same order as POWER_SUPPLY_PROP_* */ 227 static struct device_attribute power_supply_attrs[] = { 228 /* Properties of type `int' */ 229 POWER_SUPPLY_ATTR(status), 230 POWER_SUPPLY_ATTR(charge_type), 231 POWER_SUPPLY_ATTR(health), 232 POWER_SUPPLY_ATTR(present), 233 POWER_SUPPLY_ATTR(online), 234 POWER_SUPPLY_ATTR(authentic), 235 POWER_SUPPLY_ATTR(technology), 236 POWER_SUPPLY_ATTR(cycle_count), 237 POWER_SUPPLY_ATTR(voltage_max), 238 POWER_SUPPLY_ATTR(voltage_min), 239 POWER_SUPPLY_ATTR(voltage_max_design), 240 POWER_SUPPLY_ATTR(voltage_min_design), 241 POWER_SUPPLY_ATTR(voltage_now), 242 POWER_SUPPLY_ATTR(voltage_avg), 243 POWER_SUPPLY_ATTR(voltage_ocv), 244 POWER_SUPPLY_ATTR(voltage_boot), 245 POWER_SUPPLY_ATTR(current_max), 246 POWER_SUPPLY_ATTR(current_now), 247 POWER_SUPPLY_ATTR(current_avg), 248 POWER_SUPPLY_ATTR(current_boot), 249 POWER_SUPPLY_ATTR(power_now), 250 POWER_SUPPLY_ATTR(power_avg), 251 POWER_SUPPLY_ATTR(charge_full_design), 252 POWER_SUPPLY_ATTR(charge_empty_design), 253 POWER_SUPPLY_ATTR(charge_full), 254 POWER_SUPPLY_ATTR(charge_empty), 255 POWER_SUPPLY_ATTR(charge_now), 256 POWER_SUPPLY_ATTR(charge_avg), 257 POWER_SUPPLY_ATTR(charge_counter), 258 POWER_SUPPLY_ATTR(constant_charge_current), 259 POWER_SUPPLY_ATTR(constant_charge_current_max), 260 POWER_SUPPLY_ATTR(constant_charge_voltage), 261 POWER_SUPPLY_ATTR(constant_charge_voltage_max), 262 POWER_SUPPLY_ATTR(charge_control_limit), 263 POWER_SUPPLY_ATTR(charge_control_limit_max), 264 POWER_SUPPLY_ATTR(input_current_limit), 265 POWER_SUPPLY_ATTR(energy_full_design), 266 POWER_SUPPLY_ATTR(energy_empty_design), 267 POWER_SUPPLY_ATTR(energy_full), 268 POWER_SUPPLY_ATTR(energy_empty), 269 POWER_SUPPLY_ATTR(energy_now), 270 POWER_SUPPLY_ATTR(energy_avg), 271 POWER_SUPPLY_ATTR(capacity), 272 POWER_SUPPLY_ATTR(capacity_alert_min), 273 POWER_SUPPLY_ATTR(capacity_alert_max), 274 POWER_SUPPLY_ATTR(capacity_level), 275 POWER_SUPPLY_ATTR(temp), 276 POWER_SUPPLY_ATTR(temp_max), 277 POWER_SUPPLY_ATTR(temp_min), 278 POWER_SUPPLY_ATTR(temp_alert_min), 279 POWER_SUPPLY_ATTR(temp_alert_max), 280 POWER_SUPPLY_ATTR(temp_ambient), 281 POWER_SUPPLY_ATTR(temp_ambient_alert_min), 282 POWER_SUPPLY_ATTR(temp_ambient_alert_max), 283 POWER_SUPPLY_ATTR(time_to_empty_now), 284 POWER_SUPPLY_ATTR(time_to_empty_avg), 285 POWER_SUPPLY_ATTR(time_to_full_now), 286 POWER_SUPPLY_ATTR(time_to_full_avg), 287 POWER_SUPPLY_ATTR(type), 288 POWER_SUPPLY_ATTR(usb_type), 289 POWER_SUPPLY_ATTR(scope), 290 POWER_SUPPLY_ATTR(precharge_current), 291 POWER_SUPPLY_ATTR(charge_term_current), 292 POWER_SUPPLY_ATTR(calibrate), 293 /* Properties of type `const char *' */ 294 POWER_SUPPLY_ATTR(model_name), 295 POWER_SUPPLY_ATTR(manufacturer), 296 POWER_SUPPLY_ATTR(serial_number), 297 }; 298 299 static struct attribute * 300 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 301 302 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 303 struct attribute *attr, 304 int attrno) 305 { 306 struct device *dev = container_of(kobj, struct device, kobj); 307 struct power_supply *psy = dev_get_drvdata(dev); 308 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 309 int i; 310 311 if (attrno == POWER_SUPPLY_PROP_TYPE) 312 return mode; 313 314 for (i = 0; i < psy->desc->num_properties; i++) { 315 int property = psy->desc->properties[i]; 316 317 if (property == attrno) { 318 if (psy->desc->property_is_writeable && 319 psy->desc->property_is_writeable(psy, property) > 0) 320 mode |= S_IWUSR; 321 322 return mode; 323 } 324 } 325 326 return 0; 327 } 328 329 static struct attribute_group power_supply_attr_group = { 330 .attrs = __power_supply_attrs, 331 .is_visible = power_supply_attr_is_visible, 332 }; 333 334 static const struct attribute_group *power_supply_attr_groups[] = { 335 &power_supply_attr_group, 336 NULL, 337 }; 338 339 void power_supply_init_attrs(struct device_type *dev_type) 340 { 341 int i; 342 343 dev_type->groups = power_supply_attr_groups; 344 345 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 346 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 347 } 348 349 static char *kstruprdup(const char *str, gfp_t gfp) 350 { 351 char *ret, *ustr; 352 353 ustr = ret = kmalloc(strlen(str) + 1, gfp); 354 355 if (!ret) 356 return NULL; 357 358 while (*str) 359 *ustr++ = toupper(*str++); 360 361 *ustr = 0; 362 363 return ret; 364 } 365 366 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 367 { 368 struct power_supply *psy = dev_get_drvdata(dev); 369 int ret = 0, j; 370 char *prop_buf; 371 char *attrname; 372 373 dev_dbg(dev, "uevent\n"); 374 375 if (!psy || !psy->desc) { 376 dev_dbg(dev, "No power supply yet\n"); 377 return ret; 378 } 379 380 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name); 381 382 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 383 if (ret) 384 return ret; 385 386 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 387 if (!prop_buf) 388 return -ENOMEM; 389 390 for (j = 0; j < psy->desc->num_properties; j++) { 391 struct device_attribute *attr; 392 char *line; 393 394 attr = &power_supply_attrs[psy->desc->properties[j]]; 395 396 ret = power_supply_show_property(dev, attr, prop_buf); 397 if (ret == -ENODEV || ret == -ENODATA) { 398 /* When a battery is absent, we expect -ENODEV. Don't abort; 399 send the uevent with at least the the PRESENT=0 property */ 400 ret = 0; 401 continue; 402 } 403 404 if (ret < 0) 405 goto out; 406 407 line = strchr(prop_buf, '\n'); 408 if (line) 409 *line = 0; 410 411 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 412 if (!attrname) { 413 ret = -ENOMEM; 414 goto out; 415 } 416 417 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); 418 419 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 420 kfree(attrname); 421 if (ret) 422 goto out; 423 } 424 425 out: 426 free_page((unsigned long)prop_buf); 427 428 return ret; 429 } 430