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", "USB_C", 49 "USB_PD", "USB_PD_DRP" 50 }; 51 static char *status_text[] = { 52 "Unknown", "Charging", "Discharging", "Not charging", "Full" 53 }; 54 static char *charge_type[] = { 55 "Unknown", "N/A", "Trickle", "Fast" 56 }; 57 static char *health_text[] = { 58 "Unknown", "Good", "Overheat", "Dead", "Over voltage", 59 "Unspecified failure", "Cold", "Watchdog timer expire", 60 "Safety timer expire" 61 }; 62 static char *technology_text[] = { 63 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", 64 "LiMn" 65 }; 66 static char *capacity_level_text[] = { 67 "Unknown", "Critical", "Low", "Normal", "High", "Full" 68 }; 69 static char *scope_text[] = { 70 "Unknown", "System", "Device" 71 }; 72 ssize_t ret = 0; 73 struct power_supply *psy = dev_get_drvdata(dev); 74 const ptrdiff_t off = attr - power_supply_attrs; 75 union power_supply_propval value; 76 77 if (off == POWER_SUPPLY_PROP_TYPE) { 78 value.intval = psy->desc->type; 79 } else { 80 ret = power_supply_get_property(psy, off, &value); 81 82 if (ret < 0) { 83 if (ret == -ENODATA) 84 dev_dbg(dev, "driver has no data for `%s' property\n", 85 attr->attr.name); 86 else if (ret != -ENODEV && ret != -EAGAIN) 87 dev_err(dev, "driver failed to report `%s' property: %zd\n", 88 attr->attr.name, ret); 89 return ret; 90 } 91 } 92 93 if (off == POWER_SUPPLY_PROP_STATUS) 94 return sprintf(buf, "%s\n", status_text[value.intval]); 95 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) 96 return sprintf(buf, "%s\n", charge_type[value.intval]); 97 else if (off == POWER_SUPPLY_PROP_HEALTH) 98 return sprintf(buf, "%s\n", health_text[value.intval]); 99 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) 100 return sprintf(buf, "%s\n", technology_text[value.intval]); 101 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) 102 return sprintf(buf, "%s\n", capacity_level_text[value.intval]); 103 else if (off == POWER_SUPPLY_PROP_TYPE) 104 return sprintf(buf, "%s\n", type_text[value.intval]); 105 else if (off == POWER_SUPPLY_PROP_SCOPE) 106 return sprintf(buf, "%s\n", scope_text[value.intval]); 107 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) 108 return sprintf(buf, "%s\n", value.strval); 109 110 return sprintf(buf, "%d\n", value.intval); 111 } 112 113 static ssize_t power_supply_store_property(struct device *dev, 114 struct device_attribute *attr, 115 const char *buf, size_t count) { 116 ssize_t ret; 117 struct power_supply *psy = dev_get_drvdata(dev); 118 const ptrdiff_t off = attr - power_supply_attrs; 119 union power_supply_propval value; 120 long long_val; 121 122 /* TODO: support other types than int */ 123 ret = kstrtol(buf, 10, &long_val); 124 if (ret < 0) 125 return ret; 126 127 value.intval = long_val; 128 129 ret = power_supply_set_property(psy, off, &value); 130 if (ret < 0) 131 return ret; 132 133 return count; 134 } 135 136 /* Must be in the same order as POWER_SUPPLY_PROP_* */ 137 static struct device_attribute power_supply_attrs[] = { 138 /* Properties of type `int' */ 139 POWER_SUPPLY_ATTR(status), 140 POWER_SUPPLY_ATTR(charge_type), 141 POWER_SUPPLY_ATTR(health), 142 POWER_SUPPLY_ATTR(present), 143 POWER_SUPPLY_ATTR(online), 144 POWER_SUPPLY_ATTR(authentic), 145 POWER_SUPPLY_ATTR(technology), 146 POWER_SUPPLY_ATTR(cycle_count), 147 POWER_SUPPLY_ATTR(voltage_max), 148 POWER_SUPPLY_ATTR(voltage_min), 149 POWER_SUPPLY_ATTR(voltage_max_design), 150 POWER_SUPPLY_ATTR(voltage_min_design), 151 POWER_SUPPLY_ATTR(voltage_now), 152 POWER_SUPPLY_ATTR(voltage_avg), 153 POWER_SUPPLY_ATTR(voltage_ocv), 154 POWER_SUPPLY_ATTR(voltage_boot), 155 POWER_SUPPLY_ATTR(current_max), 156 POWER_SUPPLY_ATTR(current_now), 157 POWER_SUPPLY_ATTR(current_avg), 158 POWER_SUPPLY_ATTR(current_boot), 159 POWER_SUPPLY_ATTR(power_now), 160 POWER_SUPPLY_ATTR(power_avg), 161 POWER_SUPPLY_ATTR(charge_full_design), 162 POWER_SUPPLY_ATTR(charge_empty_design), 163 POWER_SUPPLY_ATTR(charge_full), 164 POWER_SUPPLY_ATTR(charge_empty), 165 POWER_SUPPLY_ATTR(charge_now), 166 POWER_SUPPLY_ATTR(charge_avg), 167 POWER_SUPPLY_ATTR(charge_counter), 168 POWER_SUPPLY_ATTR(constant_charge_current), 169 POWER_SUPPLY_ATTR(constant_charge_current_max), 170 POWER_SUPPLY_ATTR(constant_charge_voltage), 171 POWER_SUPPLY_ATTR(constant_charge_voltage_max), 172 POWER_SUPPLY_ATTR(charge_control_limit), 173 POWER_SUPPLY_ATTR(charge_control_limit_max), 174 POWER_SUPPLY_ATTR(input_current_limit), 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_max), 187 POWER_SUPPLY_ATTR(temp_min), 188 POWER_SUPPLY_ATTR(temp_alert_min), 189 POWER_SUPPLY_ATTR(temp_alert_max), 190 POWER_SUPPLY_ATTR(temp_ambient), 191 POWER_SUPPLY_ATTR(temp_ambient_alert_min), 192 POWER_SUPPLY_ATTR(temp_ambient_alert_max), 193 POWER_SUPPLY_ATTR(time_to_empty_now), 194 POWER_SUPPLY_ATTR(time_to_empty_avg), 195 POWER_SUPPLY_ATTR(time_to_full_now), 196 POWER_SUPPLY_ATTR(time_to_full_avg), 197 POWER_SUPPLY_ATTR(type), 198 POWER_SUPPLY_ATTR(scope), 199 POWER_SUPPLY_ATTR(charge_term_current), 200 POWER_SUPPLY_ATTR(calibrate), 201 /* Properties of type `const char *' */ 202 POWER_SUPPLY_ATTR(model_name), 203 POWER_SUPPLY_ATTR(manufacturer), 204 POWER_SUPPLY_ATTR(serial_number), 205 }; 206 207 static struct attribute * 208 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 209 210 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 211 struct attribute *attr, 212 int attrno) 213 { 214 struct device *dev = container_of(kobj, struct device, kobj); 215 struct power_supply *psy = dev_get_drvdata(dev); 216 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 217 int i; 218 219 if (attrno == POWER_SUPPLY_PROP_TYPE) 220 return mode; 221 222 for (i = 0; i < psy->desc->num_properties; i++) { 223 int property = psy->desc->properties[i]; 224 225 if (property == attrno) { 226 if (psy->desc->property_is_writeable && 227 psy->desc->property_is_writeable(psy, property) > 0) 228 mode |= S_IWUSR; 229 230 return mode; 231 } 232 } 233 234 return 0; 235 } 236 237 static struct attribute_group power_supply_attr_group = { 238 .attrs = __power_supply_attrs, 239 .is_visible = power_supply_attr_is_visible, 240 }; 241 242 static const struct attribute_group *power_supply_attr_groups[] = { 243 &power_supply_attr_group, 244 NULL, 245 }; 246 247 void power_supply_init_attrs(struct device_type *dev_type) 248 { 249 int i; 250 251 dev_type->groups = power_supply_attr_groups; 252 253 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 254 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 255 } 256 257 static char *kstruprdup(const char *str, gfp_t gfp) 258 { 259 char *ret, *ustr; 260 261 ustr = ret = kmalloc(strlen(str) + 1, gfp); 262 263 if (!ret) 264 return NULL; 265 266 while (*str) 267 *ustr++ = toupper(*str++); 268 269 *ustr = 0; 270 271 return ret; 272 } 273 274 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 275 { 276 struct power_supply *psy = dev_get_drvdata(dev); 277 int ret = 0, j; 278 char *prop_buf; 279 char *attrname; 280 281 dev_dbg(dev, "uevent\n"); 282 283 if (!psy || !psy->desc) { 284 dev_dbg(dev, "No power supply yet\n"); 285 return ret; 286 } 287 288 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name); 289 290 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 291 if (ret) 292 return ret; 293 294 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 295 if (!prop_buf) 296 return -ENOMEM; 297 298 for (j = 0; j < psy->desc->num_properties; j++) { 299 struct device_attribute *attr; 300 char *line; 301 302 attr = &power_supply_attrs[psy->desc->properties[j]]; 303 304 ret = power_supply_show_property(dev, attr, prop_buf); 305 if (ret == -ENODEV || ret == -ENODATA) { 306 /* When a battery is absent, we expect -ENODEV. Don't abort; 307 send the uevent with at least the the PRESENT=0 property */ 308 ret = 0; 309 continue; 310 } 311 312 if (ret < 0) 313 goto out; 314 315 line = strchr(prop_buf, '\n'); 316 if (line) 317 *line = 0; 318 319 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 320 if (!attrname) { 321 ret = -ENOMEM; 322 goto out; 323 } 324 325 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); 326 327 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 328 kfree(attrname); 329 if (ret) 330 goto out; 331 } 332 333 out: 334 free_page((unsigned long)prop_buf); 335 336 return ret; 337 } 338