rn5t618_power.c 13 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Power supply driver for the RICOH RN5T618 power management chip family
  4. *
  5. * Copyright (C) 2020 Andreas Kemnade
  6. */
  7. #include <linux/kernel.h>
  8. #include <linux/device.h>
  9. #include <linux/bitops.h>
  10. #include <linux/errno.h>
  11. #include <linux/init.h>
  12. #include <linux/interrupt.h>
  13. #include <linux/module.h>
  14. #include <linux/mfd/rn5t618.h>
  15. #include <linux/platform_device.h>
  16. #include <linux/power_supply.h>
  17. #include <linux/regmap.h>
  18. #include <linux/slab.h>
  19. #define CHG_STATE_ADP_INPUT 0x40
  20. #define CHG_STATE_USB_INPUT 0x80
  21. #define CHG_STATE_MASK 0x1f
  22. #define CHG_STATE_CHG_OFF 0
  23. #define CHG_STATE_CHG_READY_VADP 1
  24. #define CHG_STATE_CHG_TRICKLE 2
  25. #define CHG_STATE_CHG_RAPID 3
  26. #define CHG_STATE_CHG_COMPLETE 4
  27. #define CHG_STATE_SUSPEND 5
  28. #define CHG_STATE_VCHG_OVER_VOL 6
  29. #define CHG_STATE_BAT_ERROR 7
  30. #define CHG_STATE_NO_BAT 8
  31. #define CHG_STATE_BAT_OVER_VOL 9
  32. #define CHG_STATE_BAT_TEMP_ERR 10
  33. #define CHG_STATE_DIE_ERR 11
  34. #define CHG_STATE_DIE_SHUTDOWN 12
  35. #define CHG_STATE_NO_BAT2 13
  36. #define CHG_STATE_CHG_READY_VUSB 14
  37. #define FG_ENABLE 1
  38. struct rn5t618_power_info {
  39. struct rn5t618 *rn5t618;
  40. struct platform_device *pdev;
  41. struct power_supply *battery;
  42. struct power_supply *usb;
  43. struct power_supply *adp;
  44. int irq;
  45. };
  46. static enum power_supply_property rn5t618_usb_props[] = {
  47. POWER_SUPPLY_PROP_STATUS,
  48. POWER_SUPPLY_PROP_ONLINE,
  49. };
  50. static enum power_supply_property rn5t618_adp_props[] = {
  51. POWER_SUPPLY_PROP_STATUS,
  52. POWER_SUPPLY_PROP_ONLINE,
  53. };
  54. static enum power_supply_property rn5t618_battery_props[] = {
  55. POWER_SUPPLY_PROP_STATUS,
  56. POWER_SUPPLY_PROP_PRESENT,
  57. POWER_SUPPLY_PROP_VOLTAGE_NOW,
  58. POWER_SUPPLY_PROP_CURRENT_NOW,
  59. POWER_SUPPLY_PROP_CAPACITY,
  60. POWER_SUPPLY_PROP_TEMP,
  61. POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
  62. POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
  63. POWER_SUPPLY_PROP_TECHNOLOGY,
  64. POWER_SUPPLY_PROP_CHARGE_FULL,
  65. POWER_SUPPLY_PROP_CHARGE_NOW,
  66. };
  67. static int rn5t618_battery_read_doublereg(struct rn5t618_power_info *info,
  68. u8 reg, u16 *result)
  69. {
  70. int ret, i;
  71. u8 data[2];
  72. u16 old, new;
  73. old = 0;
  74. /* Prevent races when registers are changing. */
  75. for (i = 0; i < 3; i++) {
  76. ret = regmap_bulk_read(info->rn5t618->regmap,
  77. reg, data, sizeof(data));
  78. if (ret)
  79. return ret;
  80. new = data[0] << 8;
  81. new |= data[1];
  82. if (new == old)
  83. break;
  84. old = new;
  85. }
  86. *result = new;
  87. return 0;
  88. }
  89. static int rn5t618_decode_status(unsigned int status)
  90. {
  91. switch (status & CHG_STATE_MASK) {
  92. case CHG_STATE_CHG_OFF:
  93. case CHG_STATE_SUSPEND:
  94. case CHG_STATE_VCHG_OVER_VOL:
  95. case CHG_STATE_DIE_SHUTDOWN:
  96. return POWER_SUPPLY_STATUS_DISCHARGING;
  97. case CHG_STATE_CHG_TRICKLE:
  98. case CHG_STATE_CHG_RAPID:
  99. return POWER_SUPPLY_STATUS_CHARGING;
  100. case CHG_STATE_CHG_COMPLETE:
  101. return POWER_SUPPLY_STATUS_FULL;
  102. default:
  103. return POWER_SUPPLY_STATUS_NOT_CHARGING;
  104. }
  105. }
  106. static int rn5t618_battery_status(struct rn5t618_power_info *info,
  107. union power_supply_propval *val)
  108. {
  109. unsigned int v;
  110. int ret;
  111. ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
  112. if (ret)
  113. return ret;
  114. val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  115. if (v & 0xc0) { /* USB or ADP plugged */
  116. val->intval = rn5t618_decode_status(v);
  117. } else
  118. val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  119. return ret;
  120. }
  121. static int rn5t618_battery_present(struct rn5t618_power_info *info,
  122. union power_supply_propval *val)
  123. {
  124. unsigned int v;
  125. int ret;
  126. ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
  127. if (ret)
  128. return ret;
  129. v &= CHG_STATE_MASK;
  130. if ((v == CHG_STATE_NO_BAT) || (v == CHG_STATE_NO_BAT2))
  131. val->intval = 0;
  132. else
  133. val->intval = 1;
  134. return ret;
  135. }
  136. static int rn5t618_battery_voltage_now(struct rn5t618_power_info *info,
  137. union power_supply_propval *val)
  138. {
  139. u16 res;
  140. int ret;
  141. ret = rn5t618_battery_read_doublereg(info, RN5T618_VOLTAGE_1, &res);
  142. if (ret)
  143. return ret;
  144. val->intval = res * 2 * 2500 / 4095 * 1000;
  145. return 0;
  146. }
  147. static int rn5t618_battery_current_now(struct rn5t618_power_info *info,
  148. union power_supply_propval *val)
  149. {
  150. u16 res;
  151. int ret;
  152. ret = rn5t618_battery_read_doublereg(info, RN5T618_CC_AVEREG1, &res);
  153. if (ret)
  154. return ret;
  155. /* current is negative when discharging */
  156. val->intval = sign_extend32(res, 13) * 1000;
  157. return 0;
  158. }
  159. static int rn5t618_battery_capacity(struct rn5t618_power_info *info,
  160. union power_supply_propval *val)
  161. {
  162. unsigned int v;
  163. int ret;
  164. ret = regmap_read(info->rn5t618->regmap, RN5T618_SOC, &v);
  165. if (ret)
  166. return ret;
  167. val->intval = v;
  168. return 0;
  169. }
  170. static int rn5t618_battery_temp(struct rn5t618_power_info *info,
  171. union power_supply_propval *val)
  172. {
  173. u16 res;
  174. int ret;
  175. ret = rn5t618_battery_read_doublereg(info, RN5T618_TEMP_1, &res);
  176. if (ret)
  177. return ret;
  178. val->intval = sign_extend32(res, 11) * 10 / 16;
  179. return 0;
  180. }
  181. static int rn5t618_battery_tte(struct rn5t618_power_info *info,
  182. union power_supply_propval *val)
  183. {
  184. u16 res;
  185. int ret;
  186. ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_EMPTY_H, &res);
  187. if (ret)
  188. return ret;
  189. if (res == 65535)
  190. return -ENODATA;
  191. val->intval = res * 60;
  192. return 0;
  193. }
  194. static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
  195. union power_supply_propval *val)
  196. {
  197. u16 res;
  198. int ret;
  199. ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_FULL_H, &res);
  200. if (ret)
  201. return ret;
  202. if (res == 65535)
  203. return -ENODATA;
  204. val->intval = res * 60;
  205. return 0;
  206. }
  207. static int rn5t618_battery_charge_full(struct rn5t618_power_info *info,
  208. union power_supply_propval *val)
  209. {
  210. u16 res;
  211. int ret;
  212. ret = rn5t618_battery_read_doublereg(info, RN5T618_FA_CAP_H, &res);
  213. if (ret)
  214. return ret;
  215. val->intval = res * 1000;
  216. return 0;
  217. }
  218. static int rn5t618_battery_charge_now(struct rn5t618_power_info *info,
  219. union power_supply_propval *val)
  220. {
  221. u16 res;
  222. int ret;
  223. ret = rn5t618_battery_read_doublereg(info, RN5T618_RE_CAP_H, &res);
  224. if (ret)
  225. return ret;
  226. val->intval = res * 1000;
  227. return 0;
  228. }
  229. static int rn5t618_battery_get_property(struct power_supply *psy,
  230. enum power_supply_property psp,
  231. union power_supply_propval *val)
  232. {
  233. int ret = 0;
  234. struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
  235. switch (psp) {
  236. case POWER_SUPPLY_PROP_STATUS:
  237. ret = rn5t618_battery_status(info, val);
  238. break;
  239. case POWER_SUPPLY_PROP_PRESENT:
  240. ret = rn5t618_battery_present(info, val);
  241. break;
  242. case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  243. ret = rn5t618_battery_voltage_now(info, val);
  244. break;
  245. case POWER_SUPPLY_PROP_CURRENT_NOW:
  246. ret = rn5t618_battery_current_now(info, val);
  247. break;
  248. case POWER_SUPPLY_PROP_CAPACITY:
  249. ret = rn5t618_battery_capacity(info, val);
  250. break;
  251. case POWER_SUPPLY_PROP_TEMP:
  252. ret = rn5t618_battery_temp(info, val);
  253. break;
  254. case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
  255. ret = rn5t618_battery_tte(info, val);
  256. break;
  257. case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
  258. ret = rn5t618_battery_ttf(info, val);
  259. break;
  260. case POWER_SUPPLY_PROP_TECHNOLOGY:
  261. val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
  262. break;
  263. case POWER_SUPPLY_PROP_CHARGE_FULL:
  264. ret = rn5t618_battery_charge_full(info, val);
  265. break;
  266. case POWER_SUPPLY_PROP_CHARGE_NOW:
  267. ret = rn5t618_battery_charge_now(info, val);
  268. break;
  269. default:
  270. return -EINVAL;
  271. }
  272. return ret;
  273. }
  274. static int rn5t618_adp_get_property(struct power_supply *psy,
  275. enum power_supply_property psp,
  276. union power_supply_propval *val)
  277. {
  278. struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
  279. unsigned int chgstate;
  280. bool online;
  281. int ret;
  282. ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
  283. if (ret)
  284. return ret;
  285. online = !!(chgstate & CHG_STATE_ADP_INPUT);
  286. switch (psp) {
  287. case POWER_SUPPLY_PROP_ONLINE:
  288. val->intval = online;
  289. break;
  290. case POWER_SUPPLY_PROP_STATUS:
  291. if (!online) {
  292. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  293. break;
  294. }
  295. val->intval = rn5t618_decode_status(chgstate);
  296. if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
  297. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  298. break;
  299. default:
  300. return -EINVAL;
  301. }
  302. return 0;
  303. }
  304. static int rn5t618_usb_get_property(struct power_supply *psy,
  305. enum power_supply_property psp,
  306. union power_supply_propval *val)
  307. {
  308. struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
  309. unsigned int chgstate;
  310. bool online;
  311. int ret;
  312. ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
  313. if (ret)
  314. return ret;
  315. online = !!(chgstate & CHG_STATE_USB_INPUT);
  316. switch (psp) {
  317. case POWER_SUPPLY_PROP_ONLINE:
  318. val->intval = online;
  319. break;
  320. case POWER_SUPPLY_PROP_STATUS:
  321. if (!online) {
  322. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  323. break;
  324. }
  325. val->intval = rn5t618_decode_status(chgstate);
  326. if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
  327. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  328. break;
  329. default:
  330. return -EINVAL;
  331. }
  332. return 0;
  333. }
  334. static const struct power_supply_desc rn5t618_battery_desc = {
  335. .name = "rn5t618-battery",
  336. .type = POWER_SUPPLY_TYPE_BATTERY,
  337. .properties = rn5t618_battery_props,
  338. .num_properties = ARRAY_SIZE(rn5t618_battery_props),
  339. .get_property = rn5t618_battery_get_property,
  340. };
  341. static const struct power_supply_desc rn5t618_adp_desc = {
  342. .name = "rn5t618-adp",
  343. .type = POWER_SUPPLY_TYPE_MAINS,
  344. .properties = rn5t618_adp_props,
  345. .num_properties = ARRAY_SIZE(rn5t618_adp_props),
  346. .get_property = rn5t618_adp_get_property,
  347. };
  348. static const struct power_supply_desc rn5t618_usb_desc = {
  349. .name = "rn5t618-usb",
  350. .type = POWER_SUPPLY_TYPE_USB,
  351. .properties = rn5t618_usb_props,
  352. .num_properties = ARRAY_SIZE(rn5t618_usb_props),
  353. .get_property = rn5t618_usb_get_property,
  354. };
  355. static irqreturn_t rn5t618_charger_irq(int irq, void *data)
  356. {
  357. struct device *dev = data;
  358. struct rn5t618_power_info *info = dev_get_drvdata(dev);
  359. unsigned int ctrl, stat1, stat2, err;
  360. regmap_read(info->rn5t618->regmap, RN5T618_CHGERR_IRR, &err);
  361. regmap_read(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, &ctrl);
  362. regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, &stat1);
  363. regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, &stat2);
  364. regmap_write(info->rn5t618->regmap, RN5T618_CHGERR_IRR, 0);
  365. regmap_write(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, 0);
  366. regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, 0);
  367. regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, 0);
  368. dev_dbg(dev, "chgerr: %x chgctrl: %x chgstat: %x chgstat2: %x\n",
  369. err, ctrl, stat1, stat2);
  370. power_supply_changed(info->usb);
  371. power_supply_changed(info->adp);
  372. power_supply_changed(info->battery);
  373. return IRQ_HANDLED;
  374. }
  375. static int rn5t618_power_probe(struct platform_device *pdev)
  376. {
  377. int ret = 0;
  378. unsigned int v;
  379. struct power_supply_config psy_cfg = {};
  380. struct rn5t618_power_info *info;
  381. info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
  382. if (!info)
  383. return -ENOMEM;
  384. info->pdev = pdev;
  385. info->rn5t618 = dev_get_drvdata(pdev->dev.parent);
  386. info->irq = -1;
  387. platform_set_drvdata(pdev, info);
  388. ret = regmap_read(info->rn5t618->regmap, RN5T618_CONTROL, &v);
  389. if (ret)
  390. return ret;
  391. if (!(v & FG_ENABLE)) {
  392. /* E.g. the vendor kernels of various Kobo and Tolino Ebook
  393. * readers disable the fuel gauge on shutdown. If a kernel
  394. * without fuel gauge support is booted after that, the fuel
  395. * gauge will get decalibrated.
  396. */
  397. dev_info(&pdev->dev, "Fuel gauge not enabled, enabling now\n");
  398. dev_info(&pdev->dev, "Expect imprecise results\n");
  399. regmap_update_bits(info->rn5t618->regmap, RN5T618_CONTROL,
  400. FG_ENABLE, FG_ENABLE);
  401. }
  402. psy_cfg.drv_data = info;
  403. info->battery = devm_power_supply_register(&pdev->dev,
  404. &rn5t618_battery_desc,
  405. &psy_cfg);
  406. if (IS_ERR(info->battery)) {
  407. ret = PTR_ERR(info->battery);
  408. dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
  409. return ret;
  410. }
  411. info->adp = devm_power_supply_register(&pdev->dev,
  412. &rn5t618_adp_desc,
  413. &psy_cfg);
  414. if (IS_ERR(info->adp)) {
  415. ret = PTR_ERR(info->adp);
  416. dev_err(&pdev->dev, "failed to register adp: %d\n", ret);
  417. return ret;
  418. }
  419. info->usb = devm_power_supply_register(&pdev->dev,
  420. &rn5t618_usb_desc,
  421. &psy_cfg);
  422. if (IS_ERR(info->usb)) {
  423. ret = PTR_ERR(info->usb);
  424. dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
  425. return ret;
  426. }
  427. if (info->rn5t618->irq_data)
  428. info->irq = regmap_irq_get_virq(info->rn5t618->irq_data,
  429. RN5T618_IRQ_CHG);
  430. if (info->irq < 0)
  431. info->irq = -1;
  432. else {
  433. ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
  434. rn5t618_charger_irq,
  435. IRQF_ONESHOT,
  436. "rn5t618_power",
  437. &pdev->dev);
  438. if (ret < 0) {
  439. dev_err(&pdev->dev, "request IRQ:%d fail\n",
  440. info->irq);
  441. info->irq = -1;
  442. }
  443. }
  444. return 0;
  445. }
  446. static struct platform_driver rn5t618_power_driver = {
  447. .driver = {
  448. .name = "rn5t618-power",
  449. },
  450. .probe = rn5t618_power_probe,
  451. };
  452. module_platform_driver(rn5t618_power_driver);
  453. MODULE_ALIAS("platform:rn5t618-power");
  454. MODULE_DESCRIPTION("Power supply driver for RICOH RN5T618");
  455. MODULE_LICENSE("GPL");