David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Battery driver for One Laptop Per Child board. |
| 3 | * |
| 4 | * Copyright © 2006 David Woodhouse <dwmw2@infradead.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/power_supply.h> |
| 15 | #include <linux/jiffies.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <asm/olpc.h> |
| 18 | |
| 19 | |
| 20 | #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ |
| 21 | #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ |
Andres Salomon | 75d8807 | 2008-05-14 16:20:38 -0700 | [diff] [blame] | 22 | #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 23 | #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ |
| 24 | #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ |
| 25 | #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ |
| 26 | #define EC_BAT_SOC 0x16 /* uint8_t, percentage */ |
| 27 | #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ |
| 28 | #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ |
| 29 | #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ |
| 30 | |
| 31 | #define BAT_STAT_PRESENT 0x01 |
| 32 | #define BAT_STAT_FULL 0x02 |
| 33 | #define BAT_STAT_LOW 0x04 |
| 34 | #define BAT_STAT_DESTROY 0x08 |
| 35 | #define BAT_STAT_AC 0x10 |
| 36 | #define BAT_STAT_CHARGING 0x20 |
| 37 | #define BAT_STAT_DISCHARGING 0x40 |
| 38 | |
| 39 | #define BAT_ERR_INFOFAIL 0x02 |
| 40 | #define BAT_ERR_OVERVOLTAGE 0x04 |
| 41 | #define BAT_ERR_OVERTEMP 0x05 |
| 42 | #define BAT_ERR_GAUGESTOP 0x06 |
| 43 | #define BAT_ERR_OUT_OF_CONTROL 0x07 |
| 44 | #define BAT_ERR_ID_FAIL 0x09 |
| 45 | #define BAT_ERR_ACR_FAIL 0x10 |
| 46 | |
| 47 | #define BAT_ADDR_MFR_TYPE 0x5F |
| 48 | |
| 49 | /********************************************************************* |
| 50 | * Power |
| 51 | *********************************************************************/ |
| 52 | |
| 53 | static int olpc_ac_get_prop(struct power_supply *psy, |
| 54 | enum power_supply_property psp, |
| 55 | union power_supply_propval *val) |
| 56 | { |
| 57 | int ret = 0; |
| 58 | uint8_t status; |
| 59 | |
| 60 | switch (psp) { |
| 61 | case POWER_SUPPLY_PROP_ONLINE: |
| 62 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); |
| 63 | if (ret) |
| 64 | return ret; |
| 65 | |
| 66 | val->intval = !!(status & BAT_STAT_AC); |
| 67 | break; |
| 68 | default: |
| 69 | ret = -EINVAL; |
| 70 | break; |
| 71 | } |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | static enum power_supply_property olpc_ac_props[] = { |
| 76 | POWER_SUPPLY_PROP_ONLINE, |
| 77 | }; |
| 78 | |
| 79 | static struct power_supply olpc_ac = { |
| 80 | .name = "olpc-ac", |
| 81 | .type = POWER_SUPPLY_TYPE_MAINS, |
| 82 | .properties = olpc_ac_props, |
| 83 | .num_properties = ARRAY_SIZE(olpc_ac_props), |
| 84 | .get_property = olpc_ac_get_prop, |
| 85 | }; |
| 86 | |
David Woodhouse | 1ca5b9d | 2008-05-04 01:31:42 -0400 | [diff] [blame] | 87 | static char bat_serial[17]; /* Ick */ |
| 88 | |
Andres Salomon | b2bd8a3 | 2008-05-02 13:41:59 -0700 | [diff] [blame] | 89 | static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) |
| 90 | { |
| 91 | if (olpc_platform_info.ecver > 0x44) { |
| 92 | if (ec_byte & BAT_STAT_CHARGING) |
| 93 | val->intval = POWER_SUPPLY_STATUS_CHARGING; |
| 94 | else if (ec_byte & BAT_STAT_DISCHARGING) |
| 95 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
| 96 | else if (ec_byte & BAT_STAT_FULL) |
| 97 | val->intval = POWER_SUPPLY_STATUS_FULL; |
| 98 | else /* er,... */ |
| 99 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 100 | } else { |
| 101 | /* Older EC didn't report charge/discharge bits */ |
| 102 | if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ |
| 103 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
| 104 | else if (ec_byte & BAT_STAT_FULL) |
| 105 | val->intval = POWER_SUPPLY_STATUS_FULL; |
| 106 | else /* Not _necessarily_ true but EC doesn't tell all yet */ |
| 107 | val->intval = POWER_SUPPLY_STATUS_CHARGING; |
| 108 | } |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static int olpc_bat_get_health(union power_supply_propval *val) |
| 114 | { |
| 115 | uint8_t ec_byte; |
| 116 | int ret; |
| 117 | |
| 118 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); |
| 119 | if (ret) |
| 120 | return ret; |
| 121 | |
| 122 | switch (ec_byte) { |
| 123 | case 0: |
| 124 | val->intval = POWER_SUPPLY_HEALTH_GOOD; |
| 125 | break; |
| 126 | |
| 127 | case BAT_ERR_OVERTEMP: |
| 128 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; |
| 129 | break; |
| 130 | |
| 131 | case BAT_ERR_OVERVOLTAGE: |
| 132 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
| 133 | break; |
| 134 | |
| 135 | case BAT_ERR_INFOFAIL: |
| 136 | case BAT_ERR_OUT_OF_CONTROL: |
| 137 | case BAT_ERR_ID_FAIL: |
| 138 | case BAT_ERR_ACR_FAIL: |
| 139 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
| 140 | break; |
| 141 | |
| 142 | default: |
| 143 | /* Eep. We don't know this failure code */ |
| 144 | ret = -EIO; |
| 145 | } |
| 146 | |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | static int olpc_bat_get_mfr(union power_supply_propval *val) |
| 151 | { |
| 152 | uint8_t ec_byte; |
| 153 | int ret; |
| 154 | |
| 155 | ec_byte = BAT_ADDR_MFR_TYPE; |
| 156 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); |
| 157 | if (ret) |
| 158 | return ret; |
| 159 | |
| 160 | switch (ec_byte >> 4) { |
| 161 | case 1: |
| 162 | val->strval = "Gold Peak"; |
| 163 | break; |
| 164 | case 2: |
| 165 | val->strval = "BYD"; |
| 166 | break; |
| 167 | default: |
| 168 | val->strval = "Unknown"; |
| 169 | break; |
| 170 | } |
| 171 | |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | static int olpc_bat_get_tech(union power_supply_propval *val) |
| 176 | { |
| 177 | uint8_t ec_byte; |
| 178 | int ret; |
| 179 | |
| 180 | ec_byte = BAT_ADDR_MFR_TYPE; |
| 181 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); |
| 182 | if (ret) |
| 183 | return ret; |
| 184 | |
| 185 | switch (ec_byte & 0xf) { |
| 186 | case 1: |
| 187 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; |
| 188 | break; |
| 189 | case 2: |
| 190 | val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; |
| 191 | break; |
| 192 | default: |
| 193 | val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; |
| 194 | break; |
| 195 | } |
| 196 | |
| 197 | return ret; |
| 198 | } |
| 199 | |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 200 | /********************************************************************* |
| 201 | * Battery properties |
| 202 | *********************************************************************/ |
| 203 | static int olpc_bat_get_property(struct power_supply *psy, |
| 204 | enum power_supply_property psp, |
| 205 | union power_supply_propval *val) |
| 206 | { |
| 207 | int ret = 0; |
| 208 | int16_t ec_word; |
| 209 | uint8_t ec_byte; |
David Woodhouse | 1ca5b9d | 2008-05-04 01:31:42 -0400 | [diff] [blame] | 210 | uint64_t ser_buf; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 211 | |
| 212 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); |
| 213 | if (ret) |
| 214 | return ret; |
| 215 | |
| 216 | /* Theoretically there's a race here -- the battery could be |
| 217 | removed immediately after we check whether it's present, and |
| 218 | then we query for some other property of the now-absent battery. |
| 219 | It doesn't matter though -- the EC will return the last-known |
| 220 | information, and it's as if we just ran that _little_ bit faster |
| 221 | and managed to read it out before the battery went away. */ |
| 222 | if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT) |
| 223 | return -ENODEV; |
| 224 | |
| 225 | switch (psp) { |
| 226 | case POWER_SUPPLY_PROP_STATUS: |
Andres Salomon | b2bd8a3 | 2008-05-02 13:41:59 -0700 | [diff] [blame] | 227 | ret = olpc_bat_get_status(val, ec_byte); |
| 228 | if (ret) |
| 229 | return ret; |
| 230 | break; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 231 | case POWER_SUPPLY_PROP_PRESENT: |
| 232 | val->intval = !!(ec_byte & BAT_STAT_PRESENT); |
| 233 | break; |
| 234 | |
| 235 | case POWER_SUPPLY_PROP_HEALTH: |
| 236 | if (ec_byte & BAT_STAT_DESTROY) |
| 237 | val->intval = POWER_SUPPLY_HEALTH_DEAD; |
| 238 | else { |
Andres Salomon | b2bd8a3 | 2008-05-02 13:41:59 -0700 | [diff] [blame] | 239 | ret = olpc_bat_get_health(val); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 240 | if (ret) |
| 241 | return ret; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 242 | } |
| 243 | break; |
| 244 | |
| 245 | case POWER_SUPPLY_PROP_MANUFACTURER: |
Andres Salomon | b2bd8a3 | 2008-05-02 13:41:59 -0700 | [diff] [blame] | 246 | ret = olpc_bat_get_mfr(val); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 247 | if (ret) |
| 248 | return ret; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 249 | break; |
| 250 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
Andres Salomon | b2bd8a3 | 2008-05-02 13:41:59 -0700 | [diff] [blame] | 251 | ret = olpc_bat_get_tech(val); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 252 | if (ret) |
| 253 | return ret; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 254 | break; |
| 255 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: |
| 256 | ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); |
| 257 | if (ret) |
| 258 | return ret; |
| 259 | |
| 260 | ec_word = be16_to_cpu(ec_word); |
| 261 | val->intval = ec_word * 9760L / 32; |
| 262 | break; |
| 263 | case POWER_SUPPLY_PROP_CURRENT_AVG: |
| 264 | ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); |
| 265 | if (ret) |
| 266 | return ret; |
| 267 | |
| 268 | ec_word = be16_to_cpu(ec_word); |
| 269 | val->intval = ec_word * 15625L / 120; |
| 270 | break; |
| 271 | case POWER_SUPPLY_PROP_CAPACITY: |
| 272 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); |
| 273 | if (ret) |
| 274 | return ret; |
| 275 | val->intval = ec_byte; |
| 276 | break; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 277 | case POWER_SUPPLY_PROP_TEMP: |
| 278 | ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); |
| 279 | if (ret) |
| 280 | return ret; |
| 281 | ec_word = be16_to_cpu(ec_word); |
| 282 | val->intval = ec_word * 100 / 256; |
| 283 | break; |
| 284 | case POWER_SUPPLY_PROP_TEMP_AMBIENT: |
| 285 | ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); |
| 286 | if (ret) |
| 287 | return ret; |
| 288 | |
| 289 | ec_word = be16_to_cpu(ec_word); |
| 290 | val->intval = ec_word * 100 / 256; |
| 291 | break; |
Andres Salomon | 8e552c3 | 2008-05-12 21:46:29 -0400 | [diff] [blame] | 292 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
| 293 | ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); |
| 294 | if (ret) |
| 295 | return ret; |
| 296 | |
| 297 | ec_word = be16_to_cpu(ec_word); |
Andres Salomon | 75d8807 | 2008-05-14 16:20:38 -0700 | [diff] [blame] | 298 | val->intval = ec_word * 6250 / 15; |
Andres Salomon | 8e552c3 | 2008-05-12 21:46:29 -0400 | [diff] [blame] | 299 | break; |
David Woodhouse | 1ca5b9d | 2008-05-04 01:31:42 -0400 | [diff] [blame] | 300 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: |
| 301 | ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); |
| 302 | if (ret) |
| 303 | return ret; |
| 304 | |
| 305 | sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); |
| 306 | val->strval = bat_serial; |
| 307 | break; |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 308 | default: |
| 309 | ret = -EINVAL; |
| 310 | break; |
| 311 | } |
| 312 | |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | static enum power_supply_property olpc_bat_props[] = { |
| 317 | POWER_SUPPLY_PROP_STATUS, |
| 318 | POWER_SUPPLY_PROP_PRESENT, |
| 319 | POWER_SUPPLY_PROP_HEALTH, |
| 320 | POWER_SUPPLY_PROP_TECHNOLOGY, |
| 321 | POWER_SUPPLY_PROP_VOLTAGE_AVG, |
| 322 | POWER_SUPPLY_PROP_CURRENT_AVG, |
| 323 | POWER_SUPPLY_PROP_CAPACITY, |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 324 | POWER_SUPPLY_PROP_TEMP, |
| 325 | POWER_SUPPLY_PROP_TEMP_AMBIENT, |
| 326 | POWER_SUPPLY_PROP_MANUFACTURER, |
David Woodhouse | 1ca5b9d | 2008-05-04 01:31:42 -0400 | [diff] [blame] | 327 | POWER_SUPPLY_PROP_SERIAL_NUMBER, |
Andres Salomon | 8e552c3 | 2008-05-12 21:46:29 -0400 | [diff] [blame] | 328 | POWER_SUPPLY_PROP_CHARGE_COUNTER, |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 329 | }; |
| 330 | |
Andres Salomon | d7eb9e3 | 2008-05-02 13:41:58 -0700 | [diff] [blame] | 331 | /* EEPROM reading goes completely around the power_supply API, sadly */ |
| 332 | |
| 333 | #define EEPROM_START 0x20 |
| 334 | #define EEPROM_END 0x80 |
| 335 | #define EEPROM_SIZE (EEPROM_END - EEPROM_START) |
| 336 | |
| 337 | static ssize_t olpc_bat_eeprom_read(struct kobject *kobj, |
| 338 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
| 339 | { |
| 340 | uint8_t ec_byte; |
| 341 | int ret, end; |
| 342 | |
| 343 | if (off >= EEPROM_SIZE) |
| 344 | return 0; |
| 345 | if (off + count > EEPROM_SIZE) |
| 346 | count = EEPROM_SIZE - off; |
| 347 | |
| 348 | end = EEPROM_START + off + count; |
| 349 | for (ec_byte = EEPROM_START + off; ec_byte < end; ec_byte++) { |
| 350 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, |
| 351 | &buf[ec_byte - EEPROM_START], 1); |
| 352 | if (ret) { |
| 353 | printk(KERN_ERR "olpc-battery: EC command " |
| 354 | "EC_BAT_EEPROM @ 0x%x failed -" |
| 355 | " %d!\n", ec_byte, ret); |
| 356 | return -EIO; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | return count; |
| 361 | } |
| 362 | |
| 363 | static struct bin_attribute olpc_bat_eeprom = { |
| 364 | .attr = { |
| 365 | .name = "eeprom", |
| 366 | .mode = S_IRUGO, |
| 367 | .owner = THIS_MODULE, |
| 368 | }, |
| 369 | .size = 0, |
| 370 | .read = olpc_bat_eeprom_read, |
| 371 | }; |
| 372 | |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 373 | /********************************************************************* |
| 374 | * Initialisation |
| 375 | *********************************************************************/ |
| 376 | |
| 377 | static struct platform_device *bat_pdev; |
| 378 | |
| 379 | static struct power_supply olpc_bat = { |
| 380 | .properties = olpc_bat_props, |
| 381 | .num_properties = ARRAY_SIZE(olpc_bat_props), |
| 382 | .get_property = olpc_bat_get_property, |
| 383 | .use_for_apm = 1, |
| 384 | }; |
| 385 | |
| 386 | void olpc_battery_trigger_uevent(unsigned long cause) |
| 387 | { |
| 388 | if (cause & EC_SCI_SRC_ACPWR) |
| 389 | kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE); |
| 390 | if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY)) |
| 391 | kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE); |
| 392 | } |
| 393 | |
| 394 | static int __init olpc_bat_init(void) |
| 395 | { |
| 396 | int ret = 0; |
| 397 | uint8_t status; |
| 398 | |
| 399 | if (!olpc_platform_info.ecver) |
| 400 | return -ENXIO; |
Andres Salomon | 484d6d5 | 2008-05-02 13:41:59 -0700 | [diff] [blame] | 401 | |
| 402 | /* |
| 403 | * We've seen a number of EC protocol changes; this driver requires |
| 404 | * the latest EC protocol, supported by 0x44 and above. |
| 405 | */ |
| 406 | if (olpc_platform_info.ecver < 0x44) { |
| 407 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " |
| 408 | "battery driver.\n", olpc_platform_info.ecver); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 409 | return -ENXIO; |
| 410 | } |
| 411 | |
| 412 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); |
| 413 | if (ret) |
| 414 | return ret; |
| 415 | |
| 416 | /* Ignore the status. It doesn't actually matter */ |
| 417 | |
| 418 | bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0); |
| 419 | if (IS_ERR(bat_pdev)) |
| 420 | return PTR_ERR(bat_pdev); |
| 421 | |
| 422 | ret = power_supply_register(&bat_pdev->dev, &olpc_ac); |
| 423 | if (ret) |
| 424 | goto ac_failed; |
| 425 | |
| 426 | olpc_bat.name = bat_pdev->name; |
| 427 | |
| 428 | ret = power_supply_register(&bat_pdev->dev, &olpc_bat); |
| 429 | if (ret) |
| 430 | goto battery_failed; |
| 431 | |
Andres Salomon | d7eb9e3 | 2008-05-02 13:41:58 -0700 | [diff] [blame] | 432 | ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
| 433 | if (ret) |
| 434 | goto eeprom_failed; |
| 435 | |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 436 | goto success; |
| 437 | |
Andres Salomon | d7eb9e3 | 2008-05-02 13:41:58 -0700 | [diff] [blame] | 438 | eeprom_failed: |
| 439 | power_supply_unregister(&olpc_bat); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 440 | battery_failed: |
| 441 | power_supply_unregister(&olpc_ac); |
| 442 | ac_failed: |
| 443 | platform_device_unregister(bat_pdev); |
| 444 | success: |
| 445 | return ret; |
| 446 | } |
| 447 | |
| 448 | static void __exit olpc_bat_exit(void) |
| 449 | { |
Andres Salomon | d7eb9e3 | 2008-05-02 13:41:58 -0700 | [diff] [blame] | 450 | device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 451 | power_supply_unregister(&olpc_bat); |
| 452 | power_supply_unregister(&olpc_ac); |
| 453 | platform_device_unregister(bat_pdev); |
David Woodhouse | fb97287 | 2007-05-04 00:51:18 +0400 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | module_init(olpc_bat_init); |
| 457 | module_exit(olpc_bat_exit); |
| 458 | |
| 459 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
| 460 | MODULE_LICENSE("GPL"); |
| 461 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); |