axp288_fuel_gauge.c 23 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
  4. *
  5. * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com>
  6. * Copyright (C) 2014 Intel Corporation
  7. *
  8. * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  9. */
  10. #include <linux/dmi.h>
  11. #include <linux/module.h>
  12. #include <linux/kernel.h>
  13. #include <linux/device.h>
  14. #include <linux/regmap.h>
  15. #include <linux/jiffies.h>
  16. #include <linux/interrupt.h>
  17. #include <linux/mfd/axp20x.h>
  18. #include <linux/platform_device.h>
  19. #include <linux/power_supply.h>
  20. #include <linux/iio/consumer.h>
  21. #include <linux/debugfs.h>
  22. #include <linux/seq_file.h>
  23. #include <asm/unaligned.h>
  24. #define PS_STAT_VBUS_TRIGGER (1 << 0)
  25. #define PS_STAT_BAT_CHRG_DIR (1 << 2)
  26. #define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3)
  27. #define PS_STAT_VBUS_VALID (1 << 4)
  28. #define PS_STAT_VBUS_PRESENT (1 << 5)
  29. #define CHRG_STAT_BAT_SAFE_MODE (1 << 3)
  30. #define CHRG_STAT_BAT_VALID (1 << 4)
  31. #define CHRG_STAT_BAT_PRESENT (1 << 5)
  32. #define CHRG_STAT_CHARGING (1 << 6)
  33. #define CHRG_STAT_PMIC_OTP (1 << 7)
  34. #define CHRG_CCCV_CC_MASK 0xf /* 4 bits */
  35. #define CHRG_CCCV_CC_BIT_POS 0
  36. #define CHRG_CCCV_CC_OFFSET 200 /* 200mA */
  37. #define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */
  38. #define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */
  39. #define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */
  40. #define CHRG_CCCV_CV_BIT_POS 5
  41. #define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */
  42. #define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */
  43. #define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */
  44. #define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */
  45. #define CHRG_CCCV_CHG_EN (1 << 7)
  46. #define FG_CNTL_OCV_ADJ_STAT (1 << 2)
  47. #define FG_CNTL_OCV_ADJ_EN (1 << 3)
  48. #define FG_CNTL_CAP_ADJ_STAT (1 << 4)
  49. #define FG_CNTL_CAP_ADJ_EN (1 << 5)
  50. #define FG_CNTL_CC_EN (1 << 6)
  51. #define FG_CNTL_GAUGE_EN (1 << 7)
  52. #define FG_15BIT_WORD_VALID (1 << 15)
  53. #define FG_15BIT_VAL_MASK 0x7fff
  54. #define FG_REP_CAP_VALID (1 << 7)
  55. #define FG_REP_CAP_VAL_MASK 0x7F
  56. #define FG_DES_CAP1_VALID (1 << 7)
  57. #define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */
  58. #define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */
  59. #define FG_OCV_CAP_VALID (1 << 7)
  60. #define FG_OCV_CAP_VAL_MASK 0x7F
  61. #define FG_CC_CAP_VALID (1 << 7)
  62. #define FG_CC_CAP_VAL_MASK 0x7F
  63. #define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */
  64. #define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */
  65. #define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */
  66. #define FG_LOW_CAP_WARN_THR 14 /* 14 perc */
  67. #define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */
  68. #define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */
  69. #define NR_RETRY_CNT 3
  70. #define DEV_NAME "axp288_fuel_gauge"
  71. /* 1.1mV per LSB expressed in uV */
  72. #define VOLTAGE_FROM_ADC(a) ((a * 11) / 10)
  73. /* properties converted to uV, uA */
  74. #define PROP_VOLT(a) ((a) * 1000)
  75. #define PROP_CURR(a) ((a) * 1000)
  76. #define AXP288_FG_INTR_NUM 6
  77. enum {
  78. QWBTU_IRQ = 0,
  79. WBTU_IRQ,
  80. QWBTO_IRQ,
  81. WBTO_IRQ,
  82. WL2_IRQ,
  83. WL1_IRQ,
  84. };
  85. enum {
  86. BAT_TEMP = 0,
  87. PMIC_TEMP,
  88. SYSTEM_TEMP,
  89. BAT_CHRG_CURR,
  90. BAT_D_CURR,
  91. BAT_VOLT,
  92. IIO_CHANNEL_NUM
  93. };
  94. struct axp288_fg_info {
  95. struct platform_device *pdev;
  96. struct regmap *regmap;
  97. struct regmap_irq_chip_data *regmap_irqc;
  98. int irq[AXP288_FG_INTR_NUM];
  99. struct iio_channel *iio_channel[IIO_CHANNEL_NUM];
  100. struct power_supply *bat;
  101. struct mutex lock;
  102. int status;
  103. int max_volt;
  104. struct dentry *debug_file;
  105. };
  106. static enum power_supply_property fuel_gauge_props[] = {
  107. POWER_SUPPLY_PROP_STATUS,
  108. POWER_SUPPLY_PROP_PRESENT,
  109. POWER_SUPPLY_PROP_HEALTH,
  110. POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  111. POWER_SUPPLY_PROP_VOLTAGE_NOW,
  112. POWER_SUPPLY_PROP_VOLTAGE_OCV,
  113. POWER_SUPPLY_PROP_CURRENT_NOW,
  114. POWER_SUPPLY_PROP_CAPACITY,
  115. POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
  116. POWER_SUPPLY_PROP_TECHNOLOGY,
  117. POWER_SUPPLY_PROP_CHARGE_FULL,
  118. POWER_SUPPLY_PROP_CHARGE_NOW,
  119. };
  120. static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
  121. {
  122. int ret, i;
  123. unsigned int val;
  124. for (i = 0; i < NR_RETRY_CNT; i++) {
  125. ret = regmap_read(info->regmap, reg, &val);
  126. if (ret == -EBUSY)
  127. continue;
  128. else
  129. break;
  130. }
  131. if (ret < 0) {
  132. dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
  133. return ret;
  134. }
  135. return val;
  136. }
  137. static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
  138. {
  139. int ret;
  140. ret = regmap_write(info->regmap, reg, (unsigned int)val);
  141. if (ret < 0)
  142. dev_err(&info->pdev->dev, "Error writing reg 0x%02x err: %d\n", reg, ret);
  143. return ret;
  144. }
  145. static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
  146. {
  147. unsigned char buf[2];
  148. int ret;
  149. ret = regmap_bulk_read(info->regmap, reg, buf, 2);
  150. if (ret < 0) {
  151. dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
  152. reg, ret);
  153. return ret;
  154. }
  155. ret = get_unaligned_be16(buf);
  156. if (!(ret & FG_15BIT_WORD_VALID)) {
  157. dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
  158. reg);
  159. return -ENXIO;
  160. }
  161. return ret & FG_15BIT_VAL_MASK;
  162. }
  163. static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
  164. {
  165. unsigned char buf[2];
  166. int ret;
  167. ret = regmap_bulk_read(info->regmap, reg, buf, 2);
  168. if (ret < 0) {
  169. dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
  170. reg, ret);
  171. return ret;
  172. }
  173. /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
  174. return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
  175. }
  176. #ifdef CONFIG_DEBUG_FS
  177. static int fuel_gauge_debug_show(struct seq_file *s, void *data)
  178. {
  179. struct axp288_fg_info *info = s->private;
  180. int raw_val, ret;
  181. seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
  182. AXP20X_PWR_INPUT_STATUS,
  183. fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
  184. seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
  185. AXP20X_PWR_OP_MODE,
  186. fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
  187. seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
  188. AXP20X_CHRG_CTRL1,
  189. fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
  190. seq_printf(s, " VLTF[%02x] : %02x\n",
  191. AXP20X_V_LTF_DISCHRG,
  192. fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
  193. seq_printf(s, " VHTF[%02x] : %02x\n",
  194. AXP20X_V_HTF_DISCHRG,
  195. fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
  196. seq_printf(s, " CC_CTRL[%02x] : %02x\n",
  197. AXP20X_CC_CTRL,
  198. fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
  199. seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
  200. AXP20X_FG_RES,
  201. fuel_gauge_reg_readb(info, AXP20X_FG_RES));
  202. seq_printf(s, " FG_RDC1[%02x] : %02x\n",
  203. AXP288_FG_RDC1_REG,
  204. fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
  205. seq_printf(s, " FG_RDC0[%02x] : %02x\n",
  206. AXP288_FG_RDC0_REG,
  207. fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
  208. seq_printf(s, " FG_OCV[%02x] : %04x\n",
  209. AXP288_FG_OCVH_REG,
  210. fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
  211. seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
  212. AXP288_FG_DES_CAP1_REG,
  213. fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
  214. seq_printf(s, " FG_CC_MTR[%02x] : %04x\n",
  215. AXP288_FG_CC_MTR1_REG,
  216. fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
  217. seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
  218. AXP288_FG_OCV_CAP_REG,
  219. fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
  220. seq_printf(s, " FG_CC_CAP[%02x] : %02x\n",
  221. AXP288_FG_CC_CAP_REG,
  222. fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
  223. seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
  224. AXP288_FG_LOW_CAP_REG,
  225. fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
  226. seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
  227. AXP288_FG_TUNE0,
  228. fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
  229. seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
  230. AXP288_FG_TUNE1,
  231. fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
  232. seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
  233. AXP288_FG_TUNE2,
  234. fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
  235. seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
  236. AXP288_FG_TUNE3,
  237. fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
  238. seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
  239. AXP288_FG_TUNE4,
  240. fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
  241. seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
  242. AXP288_FG_TUNE5,
  243. fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
  244. ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val);
  245. if (ret >= 0)
  246. seq_printf(s, "axp288-batttemp : %d\n", raw_val);
  247. ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val);
  248. if (ret >= 0)
  249. seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
  250. ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val);
  251. if (ret >= 0)
  252. seq_printf(s, "axp288-systtemp : %d\n", raw_val);
  253. ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val);
  254. if (ret >= 0)
  255. seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
  256. ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val);
  257. if (ret >= 0)
  258. seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
  259. ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
  260. if (ret >= 0)
  261. seq_printf(s, "axp288-battvolt : %d\n", raw_val);
  262. return 0;
  263. }
  264. DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug);
  265. static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
  266. {
  267. info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
  268. info, &fuel_gauge_debug_fops);
  269. }
  270. static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
  271. {
  272. debugfs_remove(info->debug_file);
  273. }
  274. #else
  275. static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
  276. {
  277. }
  278. static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
  279. {
  280. }
  281. #endif
  282. static void fuel_gauge_get_status(struct axp288_fg_info *info)
  283. {
  284. int pwr_stat, fg_res, curr, ret;
  285. pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
  286. if (pwr_stat < 0) {
  287. dev_err(&info->pdev->dev,
  288. "PWR STAT read failed:%d\n", pwr_stat);
  289. return;
  290. }
  291. /* Report full if Vbus is valid and the reported capacity is 100% */
  292. if (!(pwr_stat & PS_STAT_VBUS_VALID))
  293. goto not_full;
  294. fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
  295. if (fg_res < 0) {
  296. dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res);
  297. return;
  298. }
  299. if (!(fg_res & FG_REP_CAP_VALID))
  300. goto not_full;
  301. fg_res &= ~FG_REP_CAP_VALID;
  302. if (fg_res == 100) {
  303. info->status = POWER_SUPPLY_STATUS_FULL;
  304. return;
  305. }
  306. /*
  307. * Sometimes the charger turns itself off before fg-res reaches 100%.
  308. * When this happens the AXP288 reports a not-charging status and
  309. * 0 mA discharge current.
  310. */
  311. if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR))
  312. goto not_full;
  313. ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr);
  314. if (ret < 0) {
  315. dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret);
  316. return;
  317. }
  318. if (curr == 0) {
  319. info->status = POWER_SUPPLY_STATUS_FULL;
  320. return;
  321. }
  322. not_full:
  323. if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
  324. info->status = POWER_SUPPLY_STATUS_CHARGING;
  325. else
  326. info->status = POWER_SUPPLY_STATUS_DISCHARGING;
  327. }
  328. static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
  329. {
  330. int ret = 0, raw_val;
  331. ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
  332. if (ret < 0)
  333. goto vbatt_read_fail;
  334. *vbatt = VOLTAGE_FROM_ADC(raw_val);
  335. vbatt_read_fail:
  336. return ret;
  337. }
  338. static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
  339. {
  340. int ret, discharge;
  341. /* First check discharge current, so that we do only 1 read on bat. */
  342. ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge);
  343. if (ret < 0)
  344. return ret;
  345. if (discharge > 0) {
  346. *cur = -1 * discharge;
  347. return 0;
  348. }
  349. return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur);
  350. }
  351. static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
  352. {
  353. int ret;
  354. ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
  355. if (ret >= 0)
  356. *vocv = VOLTAGE_FROM_ADC(ret);
  357. return ret;
  358. }
  359. static int fuel_gauge_battery_health(struct axp288_fg_info *info)
  360. {
  361. int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
  362. ret = fuel_gauge_get_vocv(info, &vocv);
  363. if (ret < 0)
  364. goto health_read_fail;
  365. if (vocv > info->max_volt)
  366. health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
  367. else
  368. health = POWER_SUPPLY_HEALTH_GOOD;
  369. health_read_fail:
  370. return health;
  371. }
  372. static int fuel_gauge_get_property(struct power_supply *ps,
  373. enum power_supply_property prop,
  374. union power_supply_propval *val)
  375. {
  376. struct axp288_fg_info *info = power_supply_get_drvdata(ps);
  377. int ret = 0, value;
  378. mutex_lock(&info->lock);
  379. switch (prop) {
  380. case POWER_SUPPLY_PROP_STATUS:
  381. fuel_gauge_get_status(info);
  382. val->intval = info->status;
  383. break;
  384. case POWER_SUPPLY_PROP_HEALTH:
  385. val->intval = fuel_gauge_battery_health(info);
  386. break;
  387. case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  388. ret = fuel_gauge_get_vbatt(info, &value);
  389. if (ret < 0)
  390. goto fuel_gauge_read_err;
  391. val->intval = PROP_VOLT(value);
  392. break;
  393. case POWER_SUPPLY_PROP_VOLTAGE_OCV:
  394. ret = fuel_gauge_get_vocv(info, &value);
  395. if (ret < 0)
  396. goto fuel_gauge_read_err;
  397. val->intval = PROP_VOLT(value);
  398. break;
  399. case POWER_SUPPLY_PROP_CURRENT_NOW:
  400. ret = fuel_gauge_get_current(info, &value);
  401. if (ret < 0)
  402. goto fuel_gauge_read_err;
  403. val->intval = PROP_CURR(value);
  404. break;
  405. case POWER_SUPPLY_PROP_PRESENT:
  406. ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
  407. if (ret < 0)
  408. goto fuel_gauge_read_err;
  409. if (ret & CHRG_STAT_BAT_PRESENT)
  410. val->intval = 1;
  411. else
  412. val->intval = 0;
  413. break;
  414. case POWER_SUPPLY_PROP_CAPACITY:
  415. ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
  416. if (ret < 0)
  417. goto fuel_gauge_read_err;
  418. if (!(ret & FG_REP_CAP_VALID))
  419. dev_err(&info->pdev->dev,
  420. "capacity measurement not valid\n");
  421. val->intval = (ret & FG_REP_CAP_VAL_MASK);
  422. break;
  423. case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
  424. ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
  425. if (ret < 0)
  426. goto fuel_gauge_read_err;
  427. val->intval = (ret & 0x0f);
  428. break;
  429. case POWER_SUPPLY_PROP_TECHNOLOGY:
  430. val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
  431. break;
  432. case POWER_SUPPLY_PROP_CHARGE_NOW:
  433. ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
  434. if (ret < 0)
  435. goto fuel_gauge_read_err;
  436. val->intval = ret * FG_DES_CAP_RES_LSB;
  437. break;
  438. case POWER_SUPPLY_PROP_CHARGE_FULL:
  439. ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
  440. if (ret < 0)
  441. goto fuel_gauge_read_err;
  442. val->intval = ret * FG_DES_CAP_RES_LSB;
  443. break;
  444. case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
  445. val->intval = PROP_VOLT(info->max_volt);
  446. break;
  447. default:
  448. mutex_unlock(&info->lock);
  449. return -EINVAL;
  450. }
  451. mutex_unlock(&info->lock);
  452. return 0;
  453. fuel_gauge_read_err:
  454. mutex_unlock(&info->lock);
  455. return ret;
  456. }
  457. static int fuel_gauge_set_property(struct power_supply *ps,
  458. enum power_supply_property prop,
  459. const union power_supply_propval *val)
  460. {
  461. struct axp288_fg_info *info = power_supply_get_drvdata(ps);
  462. int ret = 0;
  463. mutex_lock(&info->lock);
  464. switch (prop) {
  465. case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
  466. if ((val->intval < 0) || (val->intval > 15)) {
  467. ret = -EINVAL;
  468. break;
  469. }
  470. ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
  471. if (ret < 0)
  472. break;
  473. ret &= 0xf0;
  474. ret |= (val->intval & 0xf);
  475. ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
  476. break;
  477. default:
  478. ret = -EINVAL;
  479. break;
  480. }
  481. mutex_unlock(&info->lock);
  482. return ret;
  483. }
  484. static int fuel_gauge_property_is_writeable(struct power_supply *psy,
  485. enum power_supply_property psp)
  486. {
  487. int ret;
  488. switch (psp) {
  489. case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
  490. ret = 1;
  491. break;
  492. default:
  493. ret = 0;
  494. }
  495. return ret;
  496. }
  497. static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
  498. {
  499. struct axp288_fg_info *info = dev;
  500. int i;
  501. for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
  502. if (info->irq[i] == irq)
  503. break;
  504. }
  505. if (i >= AXP288_FG_INTR_NUM) {
  506. dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
  507. return IRQ_NONE;
  508. }
  509. switch (i) {
  510. case QWBTU_IRQ:
  511. dev_info(&info->pdev->dev,
  512. "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
  513. break;
  514. case WBTU_IRQ:
  515. dev_info(&info->pdev->dev,
  516. "Battery under temperature in work mode IRQ (WBTU)\n");
  517. break;
  518. case QWBTO_IRQ:
  519. dev_info(&info->pdev->dev,
  520. "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
  521. break;
  522. case WBTO_IRQ:
  523. dev_info(&info->pdev->dev,
  524. "Battery over temperature in work mode IRQ (WBTO)\n");
  525. break;
  526. case WL2_IRQ:
  527. dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
  528. break;
  529. case WL1_IRQ:
  530. dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
  531. break;
  532. default:
  533. dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
  534. }
  535. power_supply_changed(info->bat);
  536. return IRQ_HANDLED;
  537. }
  538. static void fuel_gauge_external_power_changed(struct power_supply *psy)
  539. {
  540. struct axp288_fg_info *info = power_supply_get_drvdata(psy);
  541. power_supply_changed(info->bat);
  542. }
  543. static const struct power_supply_desc fuel_gauge_desc = {
  544. .name = DEV_NAME,
  545. .type = POWER_SUPPLY_TYPE_BATTERY,
  546. .properties = fuel_gauge_props,
  547. .num_properties = ARRAY_SIZE(fuel_gauge_props),
  548. .get_property = fuel_gauge_get_property,
  549. .set_property = fuel_gauge_set_property,
  550. .property_is_writeable = fuel_gauge_property_is_writeable,
  551. .external_power_changed = fuel_gauge_external_power_changed,
  552. };
  553. static void fuel_gauge_init_irq(struct axp288_fg_info *info)
  554. {
  555. int ret, i, pirq;
  556. for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
  557. pirq = platform_get_irq(info->pdev, i);
  558. info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
  559. if (info->irq[i] < 0) {
  560. dev_warn(&info->pdev->dev,
  561. "regmap_irq get virq failed for IRQ %d: %d\n",
  562. pirq, info->irq[i]);
  563. info->irq[i] = -1;
  564. goto intr_failed;
  565. }
  566. ret = request_threaded_irq(info->irq[i],
  567. NULL, fuel_gauge_thread_handler,
  568. IRQF_ONESHOT, DEV_NAME, info);
  569. if (ret) {
  570. dev_warn(&info->pdev->dev,
  571. "request irq failed for IRQ %d: %d\n",
  572. pirq, info->irq[i]);
  573. info->irq[i] = -1;
  574. goto intr_failed;
  575. } else {
  576. dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
  577. pirq, info->irq[i]);
  578. }
  579. }
  580. return;
  581. intr_failed:
  582. for (; i > 0; i--) {
  583. free_irq(info->irq[i - 1], info);
  584. info->irq[i - 1] = -1;
  585. }
  586. }
  587. /*
  588. * Some devices have no battery (HDMI sticks) and the axp288 battery's
  589. * detection reports one despite it not being there.
  590. * Please keep this listed sorted alphabetically.
  591. */
  592. static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
  593. {
  594. /* ACEPC T8 Cherry Trail Z8350 mini PC */
  595. .matches = {
  596. DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
  597. DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
  598. DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
  599. /* also match on somewhat unique bios-version */
  600. DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
  601. },
  602. },
  603. {
  604. /* ACEPC T11 Cherry Trail Z8350 mini PC */
  605. .matches = {
  606. DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
  607. DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
  608. DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
  609. /* also match on somewhat unique bios-version */
  610. DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
  611. },
  612. },
  613. {
  614. /* ECS EF20EA */
  615. .matches = {
  616. DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
  617. },
  618. },
  619. {
  620. /* Intel Cherry Trail Compute Stick, Windows version */
  621. .matches = {
  622. DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
  623. DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"),
  624. },
  625. },
  626. {
  627. /* Intel Cherry Trail Compute Stick, version without an OS */
  628. .matches = {
  629. DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
  630. DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
  631. },
  632. },
  633. {
  634. /* Meegopad T02 */
  635. .matches = {
  636. DMI_MATCH(DMI_PRODUCT_NAME, "MEEGOPAD T02"),
  637. },
  638. },
  639. {
  640. /* Meegopad T08 */
  641. .matches = {
  642. DMI_MATCH(DMI_SYS_VENDOR, "Default string"),
  643. DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."),
  644. DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
  645. DMI_MATCH(DMI_BOARD_VERSION, "V1.1"),
  646. },
  647. },
  648. {
  649. /* Minix Neo Z83-4 mini PC */
  650. .matches = {
  651. DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
  652. DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
  653. }
  654. },
  655. {}
  656. };
  657. static int axp288_fuel_gauge_probe(struct platform_device *pdev)
  658. {
  659. int i, ret = 0;
  660. struct axp288_fg_info *info;
  661. struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
  662. struct power_supply_config psy_cfg = {};
  663. static const char * const iio_chan_name[] = {
  664. [BAT_TEMP] = "axp288-batt-temp",
  665. [PMIC_TEMP] = "axp288-pmic-temp",
  666. [SYSTEM_TEMP] = "axp288-system-temp",
  667. [BAT_CHRG_CURR] = "axp288-chrg-curr",
  668. [BAT_D_CURR] = "axp288-chrg-d-curr",
  669. [BAT_VOLT] = "axp288-batt-volt",
  670. };
  671. unsigned int val;
  672. if (dmi_check_system(axp288_fuel_gauge_blacklist))
  673. return -ENODEV;
  674. /*
  675. * On some devices the fuelgauge and charger parts of the axp288 are
  676. * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
  677. */
  678. ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
  679. if (ret < 0)
  680. return ret;
  681. if (val == 0)
  682. return -ENODEV;
  683. info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
  684. if (!info)
  685. return -ENOMEM;
  686. info->pdev = pdev;
  687. info->regmap = axp20x->regmap;
  688. info->regmap_irqc = axp20x->regmap_irqc;
  689. info->status = POWER_SUPPLY_STATUS_UNKNOWN;
  690. platform_set_drvdata(pdev, info);
  691. mutex_init(&info->lock);
  692. for (i = 0; i < IIO_CHANNEL_NUM; i++) {
  693. /*
  694. * Note cannot use devm_iio_channel_get because x86 systems
  695. * lack the device<->channel maps which iio_channel_get will
  696. * try to use when passed a non NULL device pointer.
  697. */
  698. info->iio_channel[i] =
  699. iio_channel_get(NULL, iio_chan_name[i]);
  700. if (IS_ERR(info->iio_channel[i])) {
  701. ret = PTR_ERR(info->iio_channel[i]);
  702. dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n",
  703. iio_chan_name[i], ret);
  704. /* Wait for axp288_adc to load */
  705. if (ret == -ENODEV)
  706. ret = -EPROBE_DEFER;
  707. goto out_free_iio_chan;
  708. }
  709. }
  710. ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
  711. if (ret < 0)
  712. goto out_free_iio_chan;
  713. if (!(ret & FG_DES_CAP1_VALID)) {
  714. dev_err(&pdev->dev, "axp288 not configured by firmware\n");
  715. ret = -ENODEV;
  716. goto out_free_iio_chan;
  717. }
  718. ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
  719. if (ret < 0)
  720. goto out_free_iio_chan;
  721. switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
  722. case CHRG_CCCV_CV_4100MV:
  723. info->max_volt = 4100;
  724. break;
  725. case CHRG_CCCV_CV_4150MV:
  726. info->max_volt = 4150;
  727. break;
  728. case CHRG_CCCV_CV_4200MV:
  729. info->max_volt = 4200;
  730. break;
  731. case CHRG_CCCV_CV_4350MV:
  732. info->max_volt = 4350;
  733. break;
  734. }
  735. psy_cfg.drv_data = info;
  736. info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
  737. if (IS_ERR(info->bat)) {
  738. ret = PTR_ERR(info->bat);
  739. dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
  740. goto out_free_iio_chan;
  741. }
  742. fuel_gauge_create_debugfs(info);
  743. fuel_gauge_init_irq(info);
  744. return 0;
  745. out_free_iio_chan:
  746. for (i = 0; i < IIO_CHANNEL_NUM; i++)
  747. if (!IS_ERR_OR_NULL(info->iio_channel[i]))
  748. iio_channel_release(info->iio_channel[i]);
  749. return ret;
  750. }
  751. static const struct platform_device_id axp288_fg_id_table[] = {
  752. { .name = DEV_NAME },
  753. {},
  754. };
  755. MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
  756. static int axp288_fuel_gauge_remove(struct platform_device *pdev)
  757. {
  758. struct axp288_fg_info *info = platform_get_drvdata(pdev);
  759. int i;
  760. power_supply_unregister(info->bat);
  761. fuel_gauge_remove_debugfs(info);
  762. for (i = 0; i < AXP288_FG_INTR_NUM; i++)
  763. if (info->irq[i] >= 0)
  764. free_irq(info->irq[i], info);
  765. for (i = 0; i < IIO_CHANNEL_NUM; i++)
  766. iio_channel_release(info->iio_channel[i]);
  767. return 0;
  768. }
  769. static struct platform_driver axp288_fuel_gauge_driver = {
  770. .probe = axp288_fuel_gauge_probe,
  771. .remove = axp288_fuel_gauge_remove,
  772. .id_table = axp288_fg_id_table,
  773. .driver = {
  774. .name = DEV_NAME,
  775. },
  776. };
  777. module_platform_driver(axp288_fuel_gauge_driver);
  778. MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
  779. MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
  780. MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
  781. MODULE_LICENSE("GPL");