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 41static struct device_attribute power_supply_attrs[]; 42 43static 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" 49 }; 50 static char *status_text[] = { 51 "Unknown", "Charging", "Discharging", "Not charging", "Full" 52 }; 53 static char *charge_type[] = { 54 "Unknown", "N/A", "Trickle", "Fast" 55 }; 56 static char *health_text[] = { 57 "Unknown", "Good", "Overheat", "Dead", "Over voltage", 58 "Unspecified failure", "Cold", "Watchdog timer expire", 59 "Safety timer expire" 60 }; 61 static char *technology_text[] = { 62 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", 63 "LiMn" 64 }; 65 static char *capacity_level_text[] = { 66 "Unknown", "Critical", "Low", "Normal", "High", "Full" 67 }; 68 static char *scope_text[] = { 69 "Unknown", "System", "Device" 70 }; 71 ssize_t ret = 0; 72 struct power_supply *psy = dev_get_drvdata(dev); 73 const ptrdiff_t off = attr - power_supply_attrs; 74 union power_supply_propval value; 75 76 if (off == POWER_SUPPLY_PROP_TYPE) { 77 value.intval = psy->type; 78 } else { 79 ret = psy->get_property(psy, off, &value); 80 81 if (ret < 0) { 82 if (ret == -ENODATA) 83 dev_dbg(dev, "driver has no data for `%s' property\n", 84 attr->attr.name); 85 else if (ret != -ENODEV) 86 dev_err(dev, "driver failed to report `%s' property: %zd\n", 87 attr->attr.name, ret); 88 return ret; 89 } 90 } 91 92 if (off == POWER_SUPPLY_PROP_STATUS) 93 return sprintf(buf, "%s\n", status_text[value.intval]); 94 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) 95 return sprintf(buf, "%s\n", charge_type[value.intval]); 96 else if (off == POWER_SUPPLY_PROP_HEALTH) 97 return sprintf(buf, "%s\n", health_text[value.intval]); 98 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) 99 return sprintf(buf, "%s\n", technology_text[value.intval]); 100 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) 101 return sprintf(buf, "%s\n", capacity_level_text[value.intval]); 102 else if (off == POWER_SUPPLY_PROP_TYPE) 103 return sprintf(buf, "%s\n", type_text[value.intval]); 104 else if (off == POWER_SUPPLY_PROP_SCOPE) 105 return sprintf(buf, "%s\n", scope_text[value.intval]); 106 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) 107 return sprintf(buf, "%s\n", value.strval); 108 109 if (off == POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT) 110 return sprintf(buf, "%lld\n", value.int64val); 111 else 112 return sprintf(buf, "%d\n", value.intval); 113} 114 115static ssize_t power_supply_store_property(struct device *dev, 116 struct device_attribute *attr, 117 const char *buf, size_t count) { 118 ssize_t ret; 119 struct power_supply *psy = dev_get_drvdata(dev); 120 const ptrdiff_t off = attr - power_supply_attrs; 121 union power_supply_propval value; 122 long long_val; 123 124 /* TODO: support other types than int */ 125 ret = kstrtol(buf, 10, &long_val); 126 if (ret < 0) 127 return ret; 128 129 value.intval = long_val; 130 131 ret = psy->set_property(psy, off, &value); 132 if (ret < 0) 133 return ret; 134 135 return count; 136} 137 138/* Must be in the same order as POWER_SUPPLY_PROP_* */ 139static struct device_attribute power_supply_attrs[] = { 140 /* Properties of type `int' */ 141 POWER_SUPPLY_ATTR(status), 142 POWER_SUPPLY_ATTR(charge_type), 143 POWER_SUPPLY_ATTR(health), 144 POWER_SUPPLY_ATTR(present), 145 POWER_SUPPLY_ATTR(online), 146 POWER_SUPPLY_ATTR(authentic), 147 POWER_SUPPLY_ATTR(technology), 148 POWER_SUPPLY_ATTR(cycle_count), 149 POWER_SUPPLY_ATTR(voltage_max), 150 POWER_SUPPLY_ATTR(voltage_min), 151 POWER_SUPPLY_ATTR(voltage_max_design), 152 POWER_SUPPLY_ATTR(voltage_min_design), 153 POWER_SUPPLY_ATTR(voltage_now), 154 POWER_SUPPLY_ATTR(voltage_avg), 155 POWER_SUPPLY_ATTR(voltage_ocv), 156 POWER_SUPPLY_ATTR(voltage_boot), 157 POWER_SUPPLY_ATTR(current_max), 158 POWER_SUPPLY_ATTR(current_now), 159 POWER_SUPPLY_ATTR(current_avg), 160 POWER_SUPPLY_ATTR(current_boot), 161 POWER_SUPPLY_ATTR(power_now), 162 POWER_SUPPLY_ATTR(power_avg), 163 POWER_SUPPLY_ATTR(charge_full_design), 164 POWER_SUPPLY_ATTR(charge_empty_design), 165 POWER_SUPPLY_ATTR(charge_full), 166 POWER_SUPPLY_ATTR(charge_empty), 167 POWER_SUPPLY_ATTR(charge_now), 168 POWER_SUPPLY_ATTR(charge_avg), 169 POWER_SUPPLY_ATTR(charge_counter), 170 POWER_SUPPLY_ATTR(constant_charge_current), 171 POWER_SUPPLY_ATTR(constant_charge_current_max), 172 POWER_SUPPLY_ATTR(constant_charge_voltage), 173 POWER_SUPPLY_ATTR(constant_charge_voltage_max), 174 POWER_SUPPLY_ATTR(charge_control_limit), 175 POWER_SUPPLY_ATTR(charge_control_limit_max), 176 POWER_SUPPLY_ATTR(input_current_limit), 177 POWER_SUPPLY_ATTR(energy_full_design), 178 POWER_SUPPLY_ATTR(energy_empty_design), 179 POWER_SUPPLY_ATTR(energy_full), 180 POWER_SUPPLY_ATTR(energy_empty), 181 POWER_SUPPLY_ATTR(energy_now), 182 POWER_SUPPLY_ATTR(energy_avg), 183 POWER_SUPPLY_ATTR(capacity), 184 POWER_SUPPLY_ATTR(capacity_alert_min), 185 POWER_SUPPLY_ATTR(capacity_alert_max), 186 POWER_SUPPLY_ATTR(capacity_level), 187 POWER_SUPPLY_ATTR(temp), 188 POWER_SUPPLY_ATTR(temp_max), 189 POWER_SUPPLY_ATTR(temp_min), 190 POWER_SUPPLY_ATTR(temp_alert_min), 191 POWER_SUPPLY_ATTR(temp_alert_max), 192 POWER_SUPPLY_ATTR(temp_ambient), 193 POWER_SUPPLY_ATTR(temp_ambient_alert_min), 194 POWER_SUPPLY_ATTR(temp_ambient_alert_max), 195 POWER_SUPPLY_ATTR(time_to_empty_now), 196 POWER_SUPPLY_ATTR(time_to_empty_avg), 197 POWER_SUPPLY_ATTR(time_to_full_now), 198 POWER_SUPPLY_ATTR(time_to_full_avg), 199 POWER_SUPPLY_ATTR(type), 200 POWER_SUPPLY_ATTR(scope), 201 POWER_SUPPLY_ATTR(charge_term_current), 202 POWER_SUPPLY_ATTR(calibrate), 203 /* Local extensions */ 204 POWER_SUPPLY_ATTR(usb_hc), 205 POWER_SUPPLY_ATTR(usb_otg), 206 POWER_SUPPLY_ATTR(charge_enabled), 207 /* Local extensions of type int64_t */ 208 POWER_SUPPLY_ATTR(charge_counter_ext), 209 /* Properties of type `const char *' */ 210 POWER_SUPPLY_ATTR(model_name), 211 POWER_SUPPLY_ATTR(manufacturer), 212 POWER_SUPPLY_ATTR(serial_number), 213}; 214 215static struct attribute * 216__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 217 218static umode_t power_supply_attr_is_visible(struct kobject *kobj, 219 struct attribute *attr, 220 int attrno) 221{ 222 struct device *dev = container_of(kobj, struct device, kobj); 223 struct power_supply *psy = dev_get_drvdata(dev); 224 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 225 int i; 226 227 if (attrno == POWER_SUPPLY_PROP_TYPE) 228 return mode; 229 230 for (i = 0; i < psy->num_properties; i++) { 231 int property = psy->properties[i]; 232 233 if (property == attrno) { 234 if (psy->property_is_writeable && 235 psy->property_is_writeable(psy, property) > 0) 236 mode |= S_IWUSR; 237 238 return mode; 239 } 240 } 241 242 return 0; 243} 244 245static struct attribute_group power_supply_attr_group = { 246 .attrs = __power_supply_attrs, 247 .is_visible = power_supply_attr_is_visible, 248}; 249 250static const struct attribute_group *power_supply_attr_groups[] = { 251 &power_supply_attr_group, 252 NULL, 253}; 254 255void power_supply_init_attrs(struct device_type *dev_type) 256{ 257 int i; 258 259 dev_type->groups = power_supply_attr_groups; 260 261 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 262 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 263} 264 265static char *kstruprdup(const char *str, gfp_t gfp) 266{ 267 char *ret, *ustr; 268 269 ustr = ret = kmalloc(strlen(str) + 1, gfp); 270 271 if (!ret) 272 return NULL; 273 274 while (*str) 275 *ustr++ = toupper(*str++); 276 277 *ustr = 0; 278 279 return ret; 280} 281 282int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 283{ 284 struct power_supply *psy = dev_get_drvdata(dev); 285 int ret = 0, j; 286 char *prop_buf; 287 char *attrname; 288 289 dev_dbg(dev, "uevent\n"); 290 291 if (!psy || !psy->dev) { 292 dev_dbg(dev, "No power supply yet\n"); 293 return ret; 294 } 295 296 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); 297 298 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); 299 if (ret) 300 return ret; 301 302 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 303 if (!prop_buf) 304 return -ENOMEM; 305 306 for (j = 0; j < psy->num_properties; j++) { 307 struct device_attribute *attr; 308 char *line; 309 310 attr = &power_supply_attrs[psy->properties[j]]; 311 312 ret = power_supply_show_property(dev, attr, prop_buf); 313 if (ret == -ENODEV || ret == -ENODATA) { 314 /* When a battery is absent, we expect -ENODEV. Don't abort; 315 send the uevent with at least the the PRESENT=0 property */ 316 ret = 0; 317 continue; 318 } 319 320 if (ret < 0) 321 goto out; 322 323 line = strchr(prop_buf, '\n'); 324 if (line) 325 *line = 0; 326 327 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 328 if (!attrname) { 329 ret = -ENOMEM; 330 goto out; 331 } 332 333 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); 334 335 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 336 kfree(attrname); 337 if (ret) 338 goto out; 339 } 340 341out: 342 free_page((unsigned long)prop_buf); 343 344 return ret; 345} 346