sbs.c 19 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
  4. *
  5. * Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
  6. * Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
  7. * Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
  8. */
  9. #include <linux/init.h>
  10. #include <linux/slab.h>
  11. #include <linux/module.h>
  12. #include <linux/moduleparam.h>
  13. #include <linux/kernel.h>
  14. #include <linux/acpi.h>
  15. #include <linux/timer.h>
  16. #include <linux/jiffies.h>
  17. #include <linux/delay.h>
  18. #include <linux/power_supply.h>
  19. #include <linux/platform_data/x86/apple.h>
  20. #include <acpi/battery.h>
  21. #include "sbshc.h"
  22. #define PREFIX "ACPI: "
  23. #define ACPI_SBS_CLASS "sbs"
  24. #define ACPI_AC_CLASS "ac_adapter"
  25. #define ACPI_SBS_DEVICE_NAME "Smart Battery System"
  26. #define ACPI_BATTERY_DIR_NAME "BAT%i"
  27. #define ACPI_AC_DIR_NAME "AC0"
  28. #define ACPI_SBS_NOTIFY_STATUS 0x80
  29. #define ACPI_SBS_NOTIFY_INFO 0x81
  30. MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  31. MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  32. MODULE_LICENSE("GPL");
  33. static unsigned int cache_time = 1000;
  34. module_param(cache_time, uint, 0644);
  35. MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  36. #define MAX_SBS_BAT 4
  37. #define ACPI_SBS_BLOCK_MAX 32
  38. static const struct acpi_device_id sbs_device_ids[] = {
  39. {"ACPI0002", 0},
  40. {"", 0},
  41. };
  42. MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  43. struct acpi_battery {
  44. struct power_supply *bat;
  45. struct power_supply_desc bat_desc;
  46. struct acpi_sbs *sbs;
  47. unsigned long update_time;
  48. char name[8];
  49. char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  50. char device_name[ACPI_SBS_BLOCK_MAX];
  51. char device_chemistry[ACPI_SBS_BLOCK_MAX];
  52. u16 alarm_capacity;
  53. u16 full_charge_capacity;
  54. u16 design_capacity;
  55. u16 design_voltage;
  56. u16 serial_number;
  57. u16 cycle_count;
  58. u16 temp_now;
  59. u16 voltage_now;
  60. s16 rate_now;
  61. s16 rate_avg;
  62. u16 capacity_now;
  63. u16 state_of_charge;
  64. u16 state;
  65. u16 mode;
  66. u16 spec;
  67. u8 id;
  68. u8 present:1;
  69. u8 have_sysfs_alarm:1;
  70. };
  71. #define to_acpi_battery(x) power_supply_get_drvdata(x)
  72. struct acpi_sbs {
  73. struct power_supply *charger;
  74. struct acpi_device *device;
  75. struct acpi_smb_hc *hc;
  76. struct mutex lock;
  77. struct acpi_battery battery[MAX_SBS_BAT];
  78. u8 batteries_supported:4;
  79. u8 manager_present:1;
  80. u8 charger_present:1;
  81. u8 charger_exists:1;
  82. };
  83. #define to_acpi_sbs(x) power_supply_get_drvdata(x)
  84. static int acpi_sbs_remove(struct acpi_device *device);
  85. static int acpi_battery_get_state(struct acpi_battery *battery);
  86. static inline int battery_scale(int log)
  87. {
  88. int scale = 1;
  89. while (log--)
  90. scale *= 10;
  91. return scale;
  92. }
  93. static inline int acpi_battery_vscale(struct acpi_battery *battery)
  94. {
  95. return battery_scale((battery->spec & 0x0f00) >> 8);
  96. }
  97. static inline int acpi_battery_ipscale(struct acpi_battery *battery)
  98. {
  99. return battery_scale((battery->spec & 0xf000) >> 12);
  100. }
  101. static inline int acpi_battery_mode(struct acpi_battery *battery)
  102. {
  103. return (battery->mode & 0x8000);
  104. }
  105. static inline int acpi_battery_scale(struct acpi_battery *battery)
  106. {
  107. return (acpi_battery_mode(battery) ? 10 : 1) *
  108. acpi_battery_ipscale(battery);
  109. }
  110. static int sbs_get_ac_property(struct power_supply *psy,
  111. enum power_supply_property psp,
  112. union power_supply_propval *val)
  113. {
  114. struct acpi_sbs *sbs = to_acpi_sbs(psy);
  115. switch (psp) {
  116. case POWER_SUPPLY_PROP_ONLINE:
  117. val->intval = sbs->charger_present;
  118. break;
  119. default:
  120. return -EINVAL;
  121. }
  122. return 0;
  123. }
  124. static int acpi_battery_technology(struct acpi_battery *battery)
  125. {
  126. if (!strcasecmp("NiCd", battery->device_chemistry))
  127. return POWER_SUPPLY_TECHNOLOGY_NiCd;
  128. if (!strcasecmp("NiMH", battery->device_chemistry))
  129. return POWER_SUPPLY_TECHNOLOGY_NiMH;
  130. if (!strcasecmp("LION", battery->device_chemistry))
  131. return POWER_SUPPLY_TECHNOLOGY_LION;
  132. if (!strcasecmp("LiP", battery->device_chemistry))
  133. return POWER_SUPPLY_TECHNOLOGY_LIPO;
  134. return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
  135. }
  136. static int acpi_sbs_battery_get_property(struct power_supply *psy,
  137. enum power_supply_property psp,
  138. union power_supply_propval *val)
  139. {
  140. struct acpi_battery *battery = to_acpi_battery(psy);
  141. if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
  142. return -ENODEV;
  143. acpi_battery_get_state(battery);
  144. switch (psp) {
  145. case POWER_SUPPLY_PROP_STATUS:
  146. if (battery->rate_now < 0)
  147. val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  148. else if (battery->rate_now > 0)
  149. val->intval = POWER_SUPPLY_STATUS_CHARGING;
  150. else
  151. val->intval = POWER_SUPPLY_STATUS_FULL;
  152. break;
  153. case POWER_SUPPLY_PROP_PRESENT:
  154. val->intval = battery->present;
  155. break;
  156. case POWER_SUPPLY_PROP_TECHNOLOGY:
  157. val->intval = acpi_battery_technology(battery);
  158. break;
  159. case POWER_SUPPLY_PROP_CYCLE_COUNT:
  160. val->intval = battery->cycle_count;
  161. break;
  162. case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
  163. val->intval = battery->design_voltage *
  164. acpi_battery_vscale(battery) * 1000;
  165. break;
  166. case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  167. val->intval = battery->voltage_now *
  168. acpi_battery_vscale(battery) * 1000;
  169. break;
  170. case POWER_SUPPLY_PROP_CURRENT_NOW:
  171. case POWER_SUPPLY_PROP_POWER_NOW:
  172. val->intval = abs(battery->rate_now) *
  173. acpi_battery_ipscale(battery) * 1000;
  174. val->intval *= (acpi_battery_mode(battery)) ?
  175. (battery->voltage_now *
  176. acpi_battery_vscale(battery) / 1000) : 1;
  177. break;
  178. case POWER_SUPPLY_PROP_CURRENT_AVG:
  179. case POWER_SUPPLY_PROP_POWER_AVG:
  180. val->intval = abs(battery->rate_avg) *
  181. acpi_battery_ipscale(battery) * 1000;
  182. val->intval *= (acpi_battery_mode(battery)) ?
  183. (battery->voltage_now *
  184. acpi_battery_vscale(battery) / 1000) : 1;
  185. break;
  186. case POWER_SUPPLY_PROP_CAPACITY:
  187. val->intval = battery->state_of_charge;
  188. break;
  189. case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
  190. case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
  191. val->intval = battery->design_capacity *
  192. acpi_battery_scale(battery) * 1000;
  193. break;
  194. case POWER_SUPPLY_PROP_CHARGE_FULL:
  195. case POWER_SUPPLY_PROP_ENERGY_FULL:
  196. val->intval = battery->full_charge_capacity *
  197. acpi_battery_scale(battery) * 1000;
  198. break;
  199. case POWER_SUPPLY_PROP_CHARGE_NOW:
  200. case POWER_SUPPLY_PROP_ENERGY_NOW:
  201. val->intval = battery->capacity_now *
  202. acpi_battery_scale(battery) * 1000;
  203. break;
  204. case POWER_SUPPLY_PROP_TEMP:
  205. val->intval = battery->temp_now - 2730; // dK -> dC
  206. break;
  207. case POWER_SUPPLY_PROP_MODEL_NAME:
  208. val->strval = battery->device_name;
  209. break;
  210. case POWER_SUPPLY_PROP_MANUFACTURER:
  211. val->strval = battery->manufacturer_name;
  212. break;
  213. default:
  214. return -EINVAL;
  215. }
  216. return 0;
  217. }
  218. static enum power_supply_property sbs_ac_props[] = {
  219. POWER_SUPPLY_PROP_ONLINE,
  220. };
  221. static enum power_supply_property sbs_charge_battery_props[] = {
  222. POWER_SUPPLY_PROP_STATUS,
  223. POWER_SUPPLY_PROP_PRESENT,
  224. POWER_SUPPLY_PROP_TECHNOLOGY,
  225. POWER_SUPPLY_PROP_CYCLE_COUNT,
  226. POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
  227. POWER_SUPPLY_PROP_VOLTAGE_NOW,
  228. POWER_SUPPLY_PROP_CURRENT_NOW,
  229. POWER_SUPPLY_PROP_CURRENT_AVG,
  230. POWER_SUPPLY_PROP_CAPACITY,
  231. POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
  232. POWER_SUPPLY_PROP_CHARGE_FULL,
  233. POWER_SUPPLY_PROP_CHARGE_NOW,
  234. POWER_SUPPLY_PROP_TEMP,
  235. POWER_SUPPLY_PROP_MODEL_NAME,
  236. POWER_SUPPLY_PROP_MANUFACTURER,
  237. };
  238. static enum power_supply_property sbs_energy_battery_props[] = {
  239. POWER_SUPPLY_PROP_STATUS,
  240. POWER_SUPPLY_PROP_PRESENT,
  241. POWER_SUPPLY_PROP_TECHNOLOGY,
  242. POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
  243. POWER_SUPPLY_PROP_VOLTAGE_NOW,
  244. POWER_SUPPLY_PROP_CURRENT_NOW,
  245. POWER_SUPPLY_PROP_CURRENT_AVG,
  246. POWER_SUPPLY_PROP_POWER_NOW,
  247. POWER_SUPPLY_PROP_POWER_AVG,
  248. POWER_SUPPLY_PROP_CAPACITY,
  249. POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
  250. POWER_SUPPLY_PROP_ENERGY_FULL,
  251. POWER_SUPPLY_PROP_ENERGY_NOW,
  252. POWER_SUPPLY_PROP_TEMP,
  253. POWER_SUPPLY_PROP_MODEL_NAME,
  254. POWER_SUPPLY_PROP_MANUFACTURER,
  255. };
  256. static const struct power_supply_desc acpi_sbs_charger_desc = {
  257. .name = "sbs-charger",
  258. .type = POWER_SUPPLY_TYPE_MAINS,
  259. .properties = sbs_ac_props,
  260. .num_properties = ARRAY_SIZE(sbs_ac_props),
  261. .get_property = sbs_get_ac_property,
  262. };
  263. /* --------------------------------------------------------------------------
  264. Smart Battery System Management
  265. -------------------------------------------------------------------------- */
  266. struct acpi_battery_reader {
  267. u8 command; /* command for battery */
  268. u8 mode; /* word or block? */
  269. size_t offset; /* offset inside struct acpi_sbs_battery */
  270. };
  271. static struct acpi_battery_reader info_readers[] = {
  272. {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
  273. {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
  274. {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
  275. {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
  276. {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
  277. {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
  278. {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
  279. {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
  280. {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
  281. {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
  282. {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
  283. };
  284. static struct acpi_battery_reader state_readers[] = {
  285. {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
  286. {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
  287. {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
  288. {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
  289. {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
  290. {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
  291. {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
  292. };
  293. static int acpi_manager_get_info(struct acpi_sbs *sbs)
  294. {
  295. int result = 0;
  296. u16 battery_system_info;
  297. result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
  298. 0x04, (u8 *)&battery_system_info);
  299. if (!result)
  300. sbs->batteries_supported = battery_system_info & 0x000f;
  301. return result;
  302. }
  303. static int acpi_battery_get_info(struct acpi_battery *battery)
  304. {
  305. int i, result = 0;
  306. for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
  307. result = acpi_smbus_read(battery->sbs->hc,
  308. info_readers[i].mode,
  309. ACPI_SBS_BATTERY,
  310. info_readers[i].command,
  311. (u8 *) battery +
  312. info_readers[i].offset);
  313. if (result)
  314. break;
  315. }
  316. return result;
  317. }
  318. static int acpi_battery_get_state(struct acpi_battery *battery)
  319. {
  320. int i, result = 0;
  321. if (battery->update_time &&
  322. time_before(jiffies, battery->update_time +
  323. msecs_to_jiffies(cache_time)))
  324. return 0;
  325. for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
  326. result = acpi_smbus_read(battery->sbs->hc,
  327. state_readers[i].mode,
  328. ACPI_SBS_BATTERY,
  329. state_readers[i].command,
  330. (u8 *)battery +
  331. state_readers[i].offset);
  332. if (result)
  333. goto end;
  334. }
  335. end:
  336. battery->update_time = jiffies;
  337. return result;
  338. }
  339. static int acpi_battery_get_alarm(struct acpi_battery *battery)
  340. {
  341. return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
  342. ACPI_SBS_BATTERY, 0x01,
  343. (u8 *)&battery->alarm_capacity);
  344. }
  345. static int acpi_battery_set_alarm(struct acpi_battery *battery)
  346. {
  347. struct acpi_sbs *sbs = battery->sbs;
  348. u16 value, sel = 1 << (battery->id + 12);
  349. int ret;
  350. if (sbs->manager_present) {
  351. ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
  352. 0x01, (u8 *)&value);
  353. if (ret)
  354. goto end;
  355. if ((value & 0xf000) != sel) {
  356. value &= 0x0fff;
  357. value |= sel;
  358. ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
  359. ACPI_SBS_MANAGER,
  360. 0x01, (u8 *)&value, 2);
  361. if (ret)
  362. goto end;
  363. }
  364. }
  365. ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
  366. 0x01, (u8 *)&battery->alarm_capacity, 2);
  367. end:
  368. return ret;
  369. }
  370. static int acpi_ac_get_present(struct acpi_sbs *sbs)
  371. {
  372. int result;
  373. u16 status;
  374. result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
  375. 0x13, (u8 *) & status);
  376. if (result)
  377. return result;
  378. /*
  379. * The spec requires that bit 4 always be 1. If it's not set, assume
  380. * that the implementation doesn't support an SBS charger.
  381. *
  382. * And on some MacBooks a status of 0xffff is always returned, no
  383. * matter whether the charger is plugged in or not, which is also
  384. * wrong, so ignore the SBS charger for those too.
  385. */
  386. if (!((status >> 4) & 0x1) || status == 0xffff)
  387. return -ENODEV;
  388. sbs->charger_present = (status >> 15) & 0x1;
  389. return 0;
  390. }
  391. static ssize_t acpi_battery_alarm_show(struct device *dev,
  392. struct device_attribute *attr,
  393. char *buf)
  394. {
  395. struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
  396. acpi_battery_get_alarm(battery);
  397. return sprintf(buf, "%d\n", battery->alarm_capacity *
  398. acpi_battery_scale(battery) * 1000);
  399. }
  400. static ssize_t acpi_battery_alarm_store(struct device *dev,
  401. struct device_attribute *attr,
  402. const char *buf, size_t count)
  403. {
  404. unsigned long x;
  405. struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
  406. if (sscanf(buf, "%lu\n", &x) == 1)
  407. battery->alarm_capacity = x /
  408. (1000 * acpi_battery_scale(battery));
  409. if (battery->present)
  410. acpi_battery_set_alarm(battery);
  411. return count;
  412. }
  413. static const struct device_attribute alarm_attr = {
  414. .attr = {.name = "alarm", .mode = 0644},
  415. .show = acpi_battery_alarm_show,
  416. .store = acpi_battery_alarm_store,
  417. };
  418. /* --------------------------------------------------------------------------
  419. Driver Interface
  420. -------------------------------------------------------------------------- */
  421. static int acpi_battery_read(struct acpi_battery *battery)
  422. {
  423. int result = 0, saved_present = battery->present;
  424. u16 state;
  425. if (battery->sbs->manager_present) {
  426. result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
  427. ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
  428. if (!result)
  429. battery->present = state & (1 << battery->id);
  430. state &= 0x0fff;
  431. state |= 1 << (battery->id + 12);
  432. acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
  433. ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
  434. } else if (battery->id == 0)
  435. battery->present = 1;
  436. if (result || !battery->present)
  437. return result;
  438. if (saved_present != battery->present) {
  439. battery->update_time = 0;
  440. result = acpi_battery_get_info(battery);
  441. if (result) {
  442. battery->present = 0;
  443. return result;
  444. }
  445. }
  446. result = acpi_battery_get_state(battery);
  447. if (result)
  448. battery->present = 0;
  449. return result;
  450. }
  451. /* Smart Battery */
  452. static int acpi_battery_add(struct acpi_sbs *sbs, int id)
  453. {
  454. struct acpi_battery *battery = &sbs->battery[id];
  455. struct power_supply_config psy_cfg = { .drv_data = battery, };
  456. int result;
  457. battery->id = id;
  458. battery->sbs = sbs;
  459. result = acpi_battery_read(battery);
  460. if (result)
  461. return result;
  462. sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
  463. battery->bat_desc.name = battery->name;
  464. battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
  465. if (!acpi_battery_mode(battery)) {
  466. battery->bat_desc.properties = sbs_charge_battery_props;
  467. battery->bat_desc.num_properties =
  468. ARRAY_SIZE(sbs_charge_battery_props);
  469. } else {
  470. battery->bat_desc.properties = sbs_energy_battery_props;
  471. battery->bat_desc.num_properties =
  472. ARRAY_SIZE(sbs_energy_battery_props);
  473. }
  474. battery->bat_desc.get_property = acpi_sbs_battery_get_property;
  475. battery->bat = power_supply_register(&sbs->device->dev,
  476. &battery->bat_desc, &psy_cfg);
  477. if (IS_ERR(battery->bat)) {
  478. result = PTR_ERR(battery->bat);
  479. battery->bat = NULL;
  480. goto end;
  481. }
  482. result = device_create_file(&battery->bat->dev, &alarm_attr);
  483. if (result)
  484. goto end;
  485. battery->have_sysfs_alarm = 1;
  486. end:
  487. printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
  488. ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
  489. battery->name, battery->present ? "present" : "absent");
  490. return result;
  491. }
  492. static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
  493. {
  494. struct acpi_battery *battery = &sbs->battery[id];
  495. if (battery->bat) {
  496. if (battery->have_sysfs_alarm)
  497. device_remove_file(&battery->bat->dev, &alarm_attr);
  498. power_supply_unregister(battery->bat);
  499. }
  500. }
  501. static int acpi_charger_add(struct acpi_sbs *sbs)
  502. {
  503. int result;
  504. struct power_supply_config psy_cfg = { .drv_data = sbs, };
  505. result = acpi_ac_get_present(sbs);
  506. if (result)
  507. goto end;
  508. sbs->charger_exists = 1;
  509. sbs->charger = power_supply_register(&sbs->device->dev,
  510. &acpi_sbs_charger_desc, &psy_cfg);
  511. if (IS_ERR(sbs->charger)) {
  512. result = PTR_ERR(sbs->charger);
  513. sbs->charger = NULL;
  514. }
  515. printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
  516. ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
  517. ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
  518. end:
  519. return result;
  520. }
  521. static void acpi_charger_remove(struct acpi_sbs *sbs)
  522. {
  523. if (sbs->charger)
  524. power_supply_unregister(sbs->charger);
  525. }
  526. static void acpi_sbs_callback(void *context)
  527. {
  528. int id;
  529. struct acpi_sbs *sbs = context;
  530. struct acpi_battery *bat;
  531. u8 saved_charger_state = sbs->charger_present;
  532. u8 saved_battery_state;
  533. if (sbs->charger_exists) {
  534. acpi_ac_get_present(sbs);
  535. if (sbs->charger_present != saved_charger_state)
  536. kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
  537. }
  538. if (sbs->manager_present) {
  539. for (id = 0; id < MAX_SBS_BAT; ++id) {
  540. if (!(sbs->batteries_supported & (1 << id)))
  541. continue;
  542. bat = &sbs->battery[id];
  543. saved_battery_state = bat->present;
  544. acpi_battery_read(bat);
  545. if (saved_battery_state == bat->present)
  546. continue;
  547. kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
  548. }
  549. }
  550. }
  551. static int acpi_sbs_add(struct acpi_device *device)
  552. {
  553. struct acpi_sbs *sbs;
  554. int result = 0;
  555. int id;
  556. sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
  557. if (!sbs) {
  558. result = -ENOMEM;
  559. goto end;
  560. }
  561. mutex_init(&sbs->lock);
  562. sbs->hc = acpi_driver_data(device->parent);
  563. sbs->device = device;
  564. strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
  565. strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
  566. device->driver_data = sbs;
  567. result = acpi_charger_add(sbs);
  568. if (result && result != -ENODEV)
  569. goto end;
  570. result = 0;
  571. if (!x86_apple_machine) {
  572. result = acpi_manager_get_info(sbs);
  573. if (!result) {
  574. sbs->manager_present = 1;
  575. for (id = 0; id < MAX_SBS_BAT; ++id)
  576. if ((sbs->batteries_supported & (1 << id)))
  577. acpi_battery_add(sbs, id);
  578. }
  579. }
  580. if (!sbs->manager_present)
  581. acpi_battery_add(sbs, 0);
  582. acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
  583. end:
  584. if (result)
  585. acpi_sbs_remove(device);
  586. return result;
  587. }
  588. static int acpi_sbs_remove(struct acpi_device *device)
  589. {
  590. struct acpi_sbs *sbs;
  591. int id;
  592. if (!device)
  593. return -EINVAL;
  594. sbs = acpi_driver_data(device);
  595. if (!sbs)
  596. return -EINVAL;
  597. mutex_lock(&sbs->lock);
  598. acpi_smbus_unregister_callback(sbs->hc);
  599. for (id = 0; id < MAX_SBS_BAT; ++id)
  600. acpi_battery_remove(sbs, id);
  601. acpi_charger_remove(sbs);
  602. mutex_unlock(&sbs->lock);
  603. mutex_destroy(&sbs->lock);
  604. kfree(sbs);
  605. return 0;
  606. }
  607. #ifdef CONFIG_PM_SLEEP
  608. static int acpi_sbs_resume(struct device *dev)
  609. {
  610. struct acpi_sbs *sbs;
  611. if (!dev)
  612. return -EINVAL;
  613. sbs = to_acpi_device(dev)->driver_data;
  614. acpi_sbs_callback(sbs);
  615. return 0;
  616. }
  617. #else
  618. #define acpi_sbs_resume NULL
  619. #endif
  620. static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
  621. static struct acpi_driver acpi_sbs_driver = {
  622. .name = "sbs",
  623. .class = ACPI_SBS_CLASS,
  624. .ids = sbs_device_ids,
  625. .ops = {
  626. .add = acpi_sbs_add,
  627. .remove = acpi_sbs_remove,
  628. },
  629. .drv.pm = &acpi_sbs_pm,
  630. };
  631. static int __init acpi_sbs_init(void)
  632. {
  633. int result = 0;
  634. if (acpi_disabled)
  635. return -ENODEV;
  636. result = acpi_bus_register_driver(&acpi_sbs_driver);
  637. if (result < 0)
  638. return -ENODEV;
  639. return 0;
  640. }
  641. static void __exit acpi_sbs_exit(void)
  642. {
  643. acpi_bus_unregister_driver(&acpi_sbs_driver);
  644. return;
  645. }
  646. module_init(acpi_sbs_init);
  647. module_exit(acpi_sbs_exit);