max8997-regulator.c 31 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. //
  3. // max8997.c - Regulator driver for the Maxim 8997/8966
  4. //
  5. // Copyright (C) 2011 Samsung Electronics
  6. // MyungJoo Ham <myungjoo.ham@samsung.com>
  7. //
  8. // This driver is based on max8998.c
  9. #include <linux/bug.h>
  10. #include <linux/err.h>
  11. #include <linux/gpio.h>
  12. #include <linux/of_gpio.h>
  13. #include <linux/slab.h>
  14. #include <linux/module.h>
  15. #include <linux/platform_device.h>
  16. #include <linux/regulator/driver.h>
  17. #include <linux/regulator/machine.h>
  18. #include <linux/mfd/max8997.h>
  19. #include <linux/mfd/max8997-private.h>
  20. #include <linux/regulator/of_regulator.h>
  21. struct max8997_data {
  22. struct device *dev;
  23. struct max8997_dev *iodev;
  24. int num_regulators;
  25. int ramp_delay; /* in mV/us */
  26. bool buck1_gpiodvs;
  27. bool buck2_gpiodvs;
  28. bool buck5_gpiodvs;
  29. u8 buck1_vol[8];
  30. u8 buck2_vol[8];
  31. u8 buck5_vol[8];
  32. int buck125_gpios[3];
  33. int buck125_gpioindex;
  34. bool ignore_gpiodvs_side_effect;
  35. u8 saved_states[MAX8997_REG_MAX];
  36. };
  37. static const unsigned int safeoutvolt[] = {
  38. 4850000,
  39. 4900000,
  40. 4950000,
  41. 3300000,
  42. };
  43. static inline void max8997_set_gpio(struct max8997_data *max8997)
  44. {
  45. int set3 = (max8997->buck125_gpioindex) & 0x1;
  46. int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  47. int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  48. gpio_set_value(max8997->buck125_gpios[0], set1);
  49. gpio_set_value(max8997->buck125_gpios[1], set2);
  50. gpio_set_value(max8997->buck125_gpios[2], set3);
  51. }
  52. struct voltage_map_desc {
  53. int min;
  54. int max;
  55. int step;
  56. };
  57. /* Voltage maps in uV */
  58. static const struct voltage_map_desc ldo_voltage_map_desc = {
  59. .min = 800000, .max = 3950000, .step = 50000,
  60. }; /* LDO1 ~ 18, 21 all */
  61. static const struct voltage_map_desc buck1245_voltage_map_desc = {
  62. .min = 650000, .max = 2225000, .step = 25000,
  63. }; /* Buck1, 2, 4, 5 */
  64. static const struct voltage_map_desc buck37_voltage_map_desc = {
  65. .min = 750000, .max = 3900000, .step = 50000,
  66. }; /* Buck3, 7 */
  67. /* current map in uA */
  68. static const struct voltage_map_desc charger_current_map_desc = {
  69. .min = 200000, .max = 950000, .step = 50000,
  70. };
  71. static const struct voltage_map_desc topoff_current_map_desc = {
  72. .min = 50000, .max = 200000, .step = 10000,
  73. };
  74. static const struct voltage_map_desc *reg_voltage_map[] = {
  75. [MAX8997_LDO1] = &ldo_voltage_map_desc,
  76. [MAX8997_LDO2] = &ldo_voltage_map_desc,
  77. [MAX8997_LDO3] = &ldo_voltage_map_desc,
  78. [MAX8997_LDO4] = &ldo_voltage_map_desc,
  79. [MAX8997_LDO5] = &ldo_voltage_map_desc,
  80. [MAX8997_LDO6] = &ldo_voltage_map_desc,
  81. [MAX8997_LDO7] = &ldo_voltage_map_desc,
  82. [MAX8997_LDO8] = &ldo_voltage_map_desc,
  83. [MAX8997_LDO9] = &ldo_voltage_map_desc,
  84. [MAX8997_LDO10] = &ldo_voltage_map_desc,
  85. [MAX8997_LDO11] = &ldo_voltage_map_desc,
  86. [MAX8997_LDO12] = &ldo_voltage_map_desc,
  87. [MAX8997_LDO13] = &ldo_voltage_map_desc,
  88. [MAX8997_LDO14] = &ldo_voltage_map_desc,
  89. [MAX8997_LDO15] = &ldo_voltage_map_desc,
  90. [MAX8997_LDO16] = &ldo_voltage_map_desc,
  91. [MAX8997_LDO17] = &ldo_voltage_map_desc,
  92. [MAX8997_LDO18] = &ldo_voltage_map_desc,
  93. [MAX8997_LDO21] = &ldo_voltage_map_desc,
  94. [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
  95. [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
  96. [MAX8997_BUCK3] = &buck37_voltage_map_desc,
  97. [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
  98. [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
  99. [MAX8997_BUCK6] = NULL,
  100. [MAX8997_BUCK7] = &buck37_voltage_map_desc,
  101. [MAX8997_EN32KHZ_AP] = NULL,
  102. [MAX8997_EN32KHZ_CP] = NULL,
  103. [MAX8997_ENVICHG] = NULL,
  104. [MAX8997_ESAFEOUT1] = NULL,
  105. [MAX8997_ESAFEOUT2] = NULL,
  106. [MAX8997_CHARGER_CV] = NULL,
  107. [MAX8997_CHARGER] = &charger_current_map_desc,
  108. [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
  109. };
  110. static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
  111. unsigned int selector)
  112. {
  113. int rid = rdev_get_id(rdev);
  114. if (rid != MAX8997_CHARGER_CV)
  115. goto err;
  116. switch (selector) {
  117. case 0x00:
  118. return 4200000;
  119. case 0x01 ... 0x0E:
  120. return 4000000 + 20000 * (selector - 0x01);
  121. case 0x0F:
  122. return 4350000;
  123. default:
  124. return -EINVAL;
  125. }
  126. err:
  127. return -EINVAL;
  128. }
  129. static int max8997_list_voltage(struct regulator_dev *rdev,
  130. unsigned int selector)
  131. {
  132. const struct voltage_map_desc *desc;
  133. int rid = rdev_get_id(rdev);
  134. int val;
  135. if (rid < 0 || rid >= ARRAY_SIZE(reg_voltage_map))
  136. return -EINVAL;
  137. desc = reg_voltage_map[rid];
  138. if (desc == NULL)
  139. return -EINVAL;
  140. val = desc->min + desc->step * selector;
  141. if (val > desc->max)
  142. return -EINVAL;
  143. return val;
  144. }
  145. static int max8997_get_enable_register(struct regulator_dev *rdev,
  146. int *reg, int *mask, int *pattern)
  147. {
  148. int rid = rdev_get_id(rdev);
  149. switch (rid) {
  150. case MAX8997_LDO1 ... MAX8997_LDO21:
  151. *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
  152. *mask = 0xC0;
  153. *pattern = 0xC0;
  154. break;
  155. case MAX8997_BUCK1:
  156. *reg = MAX8997_REG_BUCK1CTRL;
  157. *mask = 0x01;
  158. *pattern = 0x01;
  159. break;
  160. case MAX8997_BUCK2:
  161. *reg = MAX8997_REG_BUCK2CTRL;
  162. *mask = 0x01;
  163. *pattern = 0x01;
  164. break;
  165. case MAX8997_BUCK3:
  166. *reg = MAX8997_REG_BUCK3CTRL;
  167. *mask = 0x01;
  168. *pattern = 0x01;
  169. break;
  170. case MAX8997_BUCK4:
  171. *reg = MAX8997_REG_BUCK4CTRL;
  172. *mask = 0x01;
  173. *pattern = 0x01;
  174. break;
  175. case MAX8997_BUCK5:
  176. *reg = MAX8997_REG_BUCK5CTRL;
  177. *mask = 0x01;
  178. *pattern = 0x01;
  179. break;
  180. case MAX8997_BUCK6:
  181. *reg = MAX8997_REG_BUCK6CTRL;
  182. *mask = 0x01;
  183. *pattern = 0x01;
  184. break;
  185. case MAX8997_BUCK7:
  186. *reg = MAX8997_REG_BUCK7CTRL;
  187. *mask = 0x01;
  188. *pattern = 0x01;
  189. break;
  190. case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
  191. *reg = MAX8997_REG_MAINCON1;
  192. *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
  193. *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
  194. break;
  195. case MAX8997_ENVICHG:
  196. *reg = MAX8997_REG_MBCCTRL1;
  197. *mask = 0x80;
  198. *pattern = 0x80;
  199. break;
  200. case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
  201. *reg = MAX8997_REG_SAFEOUTCTRL;
  202. *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
  203. *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
  204. break;
  205. case MAX8997_CHARGER:
  206. *reg = MAX8997_REG_MBCCTRL2;
  207. *mask = 0x40;
  208. *pattern = 0x40;
  209. break;
  210. default:
  211. /* Not controllable or not exists */
  212. return -EINVAL;
  213. }
  214. return 0;
  215. }
  216. static int max8997_reg_is_enabled(struct regulator_dev *rdev)
  217. {
  218. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  219. struct i2c_client *i2c = max8997->iodev->i2c;
  220. int ret, reg, mask, pattern;
  221. u8 val;
  222. ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
  223. if (ret)
  224. return ret;
  225. ret = max8997_read_reg(i2c, reg, &val);
  226. if (ret)
  227. return ret;
  228. return (val & mask) == pattern;
  229. }
  230. static int max8997_reg_enable(struct regulator_dev *rdev)
  231. {
  232. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  233. struct i2c_client *i2c = max8997->iodev->i2c;
  234. int ret, reg, mask, pattern;
  235. ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
  236. if (ret)
  237. return ret;
  238. return max8997_update_reg(i2c, reg, pattern, mask);
  239. }
  240. static int max8997_reg_disable(struct regulator_dev *rdev)
  241. {
  242. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  243. struct i2c_client *i2c = max8997->iodev->i2c;
  244. int ret, reg, mask, pattern;
  245. ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
  246. if (ret)
  247. return ret;
  248. return max8997_update_reg(i2c, reg, ~pattern, mask);
  249. }
  250. static int max8997_get_voltage_register(struct regulator_dev *rdev,
  251. int *_reg, int *_shift, int *_mask)
  252. {
  253. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  254. int rid = rdev_get_id(rdev);
  255. int reg, shift = 0, mask = 0x3f;
  256. switch (rid) {
  257. case MAX8997_LDO1 ... MAX8997_LDO21:
  258. reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
  259. break;
  260. case MAX8997_BUCK1:
  261. reg = MAX8997_REG_BUCK1DVS1;
  262. if (max8997->buck1_gpiodvs)
  263. reg += max8997->buck125_gpioindex;
  264. break;
  265. case MAX8997_BUCK2:
  266. reg = MAX8997_REG_BUCK2DVS1;
  267. if (max8997->buck2_gpiodvs)
  268. reg += max8997->buck125_gpioindex;
  269. break;
  270. case MAX8997_BUCK3:
  271. reg = MAX8997_REG_BUCK3DVS;
  272. break;
  273. case MAX8997_BUCK4:
  274. reg = MAX8997_REG_BUCK4DVS;
  275. break;
  276. case MAX8997_BUCK5:
  277. reg = MAX8997_REG_BUCK5DVS1;
  278. if (max8997->buck5_gpiodvs)
  279. reg += max8997->buck125_gpioindex;
  280. break;
  281. case MAX8997_BUCK7:
  282. reg = MAX8997_REG_BUCK7DVS;
  283. break;
  284. case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
  285. reg = MAX8997_REG_SAFEOUTCTRL;
  286. shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
  287. mask = 0x3;
  288. break;
  289. case MAX8997_CHARGER_CV:
  290. reg = MAX8997_REG_MBCCTRL3;
  291. shift = 0;
  292. mask = 0xf;
  293. break;
  294. case MAX8997_CHARGER:
  295. reg = MAX8997_REG_MBCCTRL4;
  296. shift = 0;
  297. mask = 0xf;
  298. break;
  299. case MAX8997_CHARGER_TOPOFF:
  300. reg = MAX8997_REG_MBCCTRL5;
  301. shift = 0;
  302. mask = 0xf;
  303. break;
  304. default:
  305. return -EINVAL;
  306. }
  307. *_reg = reg;
  308. *_shift = shift;
  309. *_mask = mask;
  310. return 0;
  311. }
  312. static int max8997_get_voltage_sel(struct regulator_dev *rdev)
  313. {
  314. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  315. struct i2c_client *i2c = max8997->iodev->i2c;
  316. int reg, shift, mask, ret;
  317. u8 val;
  318. ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
  319. if (ret)
  320. return ret;
  321. ret = max8997_read_reg(i2c, reg, &val);
  322. if (ret)
  323. return ret;
  324. val >>= shift;
  325. val &= mask;
  326. return val;
  327. }
  328. static inline int max8997_get_voltage_proper_val(
  329. const struct voltage_map_desc *desc,
  330. int min_vol, int max_vol)
  331. {
  332. int i;
  333. if (desc == NULL)
  334. return -EINVAL;
  335. if (max_vol < desc->min || min_vol > desc->max)
  336. return -EINVAL;
  337. if (min_vol < desc->min)
  338. min_vol = desc->min;
  339. i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
  340. if (desc->min + desc->step * i > max_vol)
  341. return -EINVAL;
  342. return i;
  343. }
  344. static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
  345. int min_uV, int max_uV, unsigned *selector)
  346. {
  347. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  348. struct i2c_client *i2c = max8997->iodev->i2c;
  349. int rid = rdev_get_id(rdev);
  350. int lb, ub;
  351. int reg, shift = 0, mask, ret = 0;
  352. u8 val = 0x0;
  353. if (rid != MAX8997_CHARGER_CV)
  354. return -EINVAL;
  355. ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
  356. if (ret)
  357. return ret;
  358. if (max_uV < 4000000 || min_uV > 4350000)
  359. return -EINVAL;
  360. if (min_uV <= 4000000)
  361. val = 0x1;
  362. else if (min_uV <= 4200000 && max_uV >= 4200000)
  363. val = 0x0;
  364. else {
  365. lb = (min_uV - 4000001) / 20000 + 2;
  366. ub = (max_uV - 4000000) / 20000 + 1;
  367. if (lb > ub)
  368. return -EINVAL;
  369. if (lb < 0xf)
  370. val = lb;
  371. else {
  372. if (ub >= 0xf)
  373. val = 0xf;
  374. else
  375. return -EINVAL;
  376. }
  377. }
  378. *selector = val;
  379. ret = max8997_update_reg(i2c, reg, val << shift, mask);
  380. return ret;
  381. }
  382. /*
  383. * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
  384. * BUCK1, 2, and 5 are available if they are not controlled by gpio
  385. */
  386. static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
  387. int min_uV, int max_uV, unsigned *selector)
  388. {
  389. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  390. struct i2c_client *i2c = max8997->iodev->i2c;
  391. const struct voltage_map_desc *desc;
  392. int rid = rdev_get_id(rdev);
  393. int i, reg, shift, mask, ret;
  394. switch (rid) {
  395. case MAX8997_LDO1 ... MAX8997_LDO21:
  396. break;
  397. case MAX8997_BUCK1 ... MAX8997_BUCK5:
  398. break;
  399. case MAX8997_BUCK6:
  400. return -EINVAL;
  401. case MAX8997_BUCK7:
  402. break;
  403. case MAX8997_CHARGER:
  404. break;
  405. case MAX8997_CHARGER_TOPOFF:
  406. break;
  407. default:
  408. return -EINVAL;
  409. }
  410. desc = reg_voltage_map[rid];
  411. i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
  412. if (i < 0)
  413. return i;
  414. ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
  415. if (ret)
  416. return ret;
  417. ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
  418. *selector = i;
  419. return ret;
  420. }
  421. static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
  422. unsigned int old_selector,
  423. unsigned int new_selector)
  424. {
  425. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  426. int rid = rdev_get_id(rdev);
  427. const struct voltage_map_desc *desc = reg_voltage_map[rid];
  428. /* Delay is required only if the voltage is increasing */
  429. if (old_selector >= new_selector)
  430. return 0;
  431. /* No need to delay if gpio_dvs_mode */
  432. switch (rid) {
  433. case MAX8997_BUCK1:
  434. if (max8997->buck1_gpiodvs)
  435. return 0;
  436. break;
  437. case MAX8997_BUCK2:
  438. if (max8997->buck2_gpiodvs)
  439. return 0;
  440. break;
  441. case MAX8997_BUCK5:
  442. if (max8997->buck5_gpiodvs)
  443. return 0;
  444. break;
  445. }
  446. switch (rid) {
  447. case MAX8997_BUCK1:
  448. case MAX8997_BUCK2:
  449. case MAX8997_BUCK4:
  450. case MAX8997_BUCK5:
  451. return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
  452. max8997->ramp_delay * 1000);
  453. }
  454. return 0;
  455. }
  456. /*
  457. * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
  458. *
  459. * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
  460. * of one of the bucks may affect that of another buck, which is the side
  461. * effect of the change (set_voltage). This function examines the GPIO-DVS
  462. * configurations and checks whether such side-effect exists.
  463. */
  464. static int max8997_assess_side_effect(struct regulator_dev *rdev,
  465. u8 new_val, int *best)
  466. {
  467. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  468. int rid = rdev_get_id(rdev);
  469. u8 *buckx_val[3];
  470. bool buckx_gpiodvs[3];
  471. int side_effect[8];
  472. int min_side_effect = INT_MAX;
  473. int i;
  474. *best = -1;
  475. switch (rid) {
  476. case MAX8997_BUCK1:
  477. rid = 0;
  478. break;
  479. case MAX8997_BUCK2:
  480. rid = 1;
  481. break;
  482. case MAX8997_BUCK5:
  483. rid = 2;
  484. break;
  485. default:
  486. return -EINVAL;
  487. }
  488. buckx_val[0] = max8997->buck1_vol;
  489. buckx_val[1] = max8997->buck2_vol;
  490. buckx_val[2] = max8997->buck5_vol;
  491. buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
  492. buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
  493. buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
  494. for (i = 0; i < 8; i++) {
  495. int others;
  496. if (new_val != (buckx_val[rid])[i]) {
  497. side_effect[i] = -1;
  498. continue;
  499. }
  500. side_effect[i] = 0;
  501. for (others = 0; others < 3; others++) {
  502. int diff;
  503. if (others == rid)
  504. continue;
  505. if (buckx_gpiodvs[others] == false)
  506. continue; /* Not affected */
  507. diff = (buckx_val[others])[i] -
  508. (buckx_val[others])[max8997->buck125_gpioindex];
  509. if (diff > 0)
  510. side_effect[i] += diff;
  511. else if (diff < 0)
  512. side_effect[i] -= diff;
  513. }
  514. if (side_effect[i] == 0) {
  515. *best = i;
  516. return 0; /* NO SIDE EFFECT! Use This! */
  517. }
  518. if (side_effect[i] < min_side_effect) {
  519. min_side_effect = side_effect[i];
  520. *best = i;
  521. }
  522. }
  523. if (*best == -1)
  524. return -EINVAL;
  525. return side_effect[*best];
  526. }
  527. /*
  528. * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
  529. * max8997_set_voltage_ldobuck to do the job.
  530. */
  531. static int max8997_set_voltage_buck(struct regulator_dev *rdev,
  532. int min_uV, int max_uV, unsigned *selector)
  533. {
  534. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  535. int rid = rdev_get_id(rdev);
  536. const struct voltage_map_desc *desc;
  537. int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
  538. bool gpio_dvs_mode = false;
  539. if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
  540. return -EINVAL;
  541. switch (rid) {
  542. case MAX8997_BUCK1:
  543. if (max8997->buck1_gpiodvs)
  544. gpio_dvs_mode = true;
  545. break;
  546. case MAX8997_BUCK2:
  547. if (max8997->buck2_gpiodvs)
  548. gpio_dvs_mode = true;
  549. break;
  550. case MAX8997_BUCK5:
  551. if (max8997->buck5_gpiodvs)
  552. gpio_dvs_mode = true;
  553. break;
  554. }
  555. if (!gpio_dvs_mode)
  556. return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
  557. selector);
  558. desc = reg_voltage_map[rid];
  559. new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
  560. if (new_val < 0)
  561. return new_val;
  562. tmp_dmg = INT_MAX;
  563. tmp_idx = -1;
  564. tmp_val = -1;
  565. do {
  566. damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
  567. if (damage == 0)
  568. goto out;
  569. if (tmp_dmg > damage) {
  570. tmp_idx = new_idx;
  571. tmp_val = new_val;
  572. tmp_dmg = damage;
  573. }
  574. new_val++;
  575. } while (desc->min + desc->step * new_val <= desc->max);
  576. new_idx = tmp_idx;
  577. new_val = tmp_val;
  578. if (max8997->ignore_gpiodvs_side_effect == false)
  579. return -EINVAL;
  580. dev_warn(&rdev->dev,
  581. "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET: %d -> %d\n",
  582. max8997->buck125_gpioindex, tmp_idx);
  583. out:
  584. if (new_idx < 0 || new_val < 0)
  585. return -EINVAL;
  586. max8997->buck125_gpioindex = new_idx;
  587. max8997_set_gpio(max8997);
  588. *selector = new_val;
  589. return 0;
  590. }
  591. /* For SAFEOUT1 and SAFEOUT2 */
  592. static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
  593. unsigned selector)
  594. {
  595. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  596. struct i2c_client *i2c = max8997->iodev->i2c;
  597. int rid = rdev_get_id(rdev);
  598. int reg, shift = 0, mask, ret;
  599. if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
  600. return -EINVAL;
  601. ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
  602. if (ret)
  603. return ret;
  604. return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
  605. }
  606. static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
  607. {
  608. struct max8997_data *max8997 = rdev_get_drvdata(rdev);
  609. struct i2c_client *i2c = max8997->iodev->i2c;
  610. int ret, reg, mask, pattern;
  611. int rid = rdev_get_id(rdev);
  612. ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
  613. if (ret)
  614. return ret;
  615. max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
  616. if (rid == MAX8997_LDO1 ||
  617. rid == MAX8997_LDO10 ||
  618. rid == MAX8997_LDO21) {
  619. dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
  620. rdev->desc->name);
  621. return max8997_update_reg(i2c, reg, 0x40, mask);
  622. }
  623. dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
  624. rdev->desc->name, max8997->saved_states[rid] & mask,
  625. (~pattern) & mask);
  626. return max8997_update_reg(i2c, reg, ~pattern, mask);
  627. }
  628. static const struct regulator_ops max8997_ldo_ops = {
  629. .list_voltage = max8997_list_voltage,
  630. .is_enabled = max8997_reg_is_enabled,
  631. .enable = max8997_reg_enable,
  632. .disable = max8997_reg_disable,
  633. .get_voltage_sel = max8997_get_voltage_sel,
  634. .set_voltage = max8997_set_voltage_ldobuck,
  635. .set_suspend_disable = max8997_reg_disable_suspend,
  636. };
  637. static const struct regulator_ops max8997_buck_ops = {
  638. .list_voltage = max8997_list_voltage,
  639. .is_enabled = max8997_reg_is_enabled,
  640. .enable = max8997_reg_enable,
  641. .disable = max8997_reg_disable,
  642. .get_voltage_sel = max8997_get_voltage_sel,
  643. .set_voltage = max8997_set_voltage_buck,
  644. .set_voltage_time_sel = max8997_set_voltage_buck_time_sel,
  645. .set_suspend_disable = max8997_reg_disable_suspend,
  646. };
  647. static const struct regulator_ops max8997_fixedvolt_ops = {
  648. .list_voltage = max8997_list_voltage,
  649. .is_enabled = max8997_reg_is_enabled,
  650. .enable = max8997_reg_enable,
  651. .disable = max8997_reg_disable,
  652. .set_suspend_disable = max8997_reg_disable_suspend,
  653. };
  654. static const struct regulator_ops max8997_safeout_ops = {
  655. .list_voltage = regulator_list_voltage_table,
  656. .is_enabled = max8997_reg_is_enabled,
  657. .enable = max8997_reg_enable,
  658. .disable = max8997_reg_disable,
  659. .get_voltage_sel = max8997_get_voltage_sel,
  660. .set_voltage_sel = max8997_set_voltage_safeout_sel,
  661. .set_suspend_disable = max8997_reg_disable_suspend,
  662. };
  663. static const struct regulator_ops max8997_fixedstate_ops = {
  664. .list_voltage = max8997_list_voltage_charger_cv,
  665. .get_voltage_sel = max8997_get_voltage_sel,
  666. .set_voltage = max8997_set_voltage_charger_cv,
  667. };
  668. static int max8997_set_current_limit(struct regulator_dev *rdev,
  669. int min_uA, int max_uA)
  670. {
  671. unsigned dummy;
  672. int rid = rdev_get_id(rdev);
  673. if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
  674. return -EINVAL;
  675. /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
  676. return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
  677. }
  678. static int max8997_get_current_limit(struct regulator_dev *rdev)
  679. {
  680. int sel, rid = rdev_get_id(rdev);
  681. if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
  682. return -EINVAL;
  683. sel = max8997_get_voltage_sel(rdev);
  684. if (sel < 0)
  685. return sel;
  686. /* Reuse max8997_list_voltage to get current_limit. */
  687. return max8997_list_voltage(rdev, sel);
  688. }
  689. static const struct regulator_ops max8997_charger_ops = {
  690. .is_enabled = max8997_reg_is_enabled,
  691. .enable = max8997_reg_enable,
  692. .disable = max8997_reg_disable,
  693. .get_current_limit = max8997_get_current_limit,
  694. .set_current_limit = max8997_set_current_limit,
  695. };
  696. static const struct regulator_ops max8997_charger_fixedstate_ops = {
  697. .get_current_limit = max8997_get_current_limit,
  698. .set_current_limit = max8997_set_current_limit,
  699. };
  700. #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
  701. .name = #_name, \
  702. .id = MAX8997_##_name, \
  703. .ops = &_ops, \
  704. .type = REGULATOR_VOLTAGE, \
  705. .owner = THIS_MODULE, \
  706. }
  707. #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
  708. .name = #_name, \
  709. .id = MAX8997_##_name, \
  710. .ops = &_ops, \
  711. .type = REGULATOR_CURRENT, \
  712. .owner = THIS_MODULE, \
  713. }
  714. static struct regulator_desc regulators[] = {
  715. MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
  716. MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
  717. MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
  718. MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
  719. MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
  720. MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
  721. MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
  722. MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
  723. MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
  724. MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
  725. MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
  726. MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
  727. MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
  728. MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
  729. MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
  730. MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
  731. MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
  732. MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
  733. MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
  734. MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
  735. MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
  736. MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
  737. MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
  738. MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
  739. MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
  740. MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
  741. MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
  742. MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
  743. MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
  744. MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
  745. MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
  746. MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
  747. MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
  748. MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
  749. max8997_charger_fixedstate_ops),
  750. };
  751. #ifdef CONFIG_OF
  752. static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
  753. struct max8997_platform_data *pdata,
  754. struct device_node *pmic_np)
  755. {
  756. int i, gpio;
  757. for (i = 0; i < 3; i++) {
  758. gpio = of_get_named_gpio(pmic_np,
  759. "max8997,pmic-buck125-dvs-gpios", i);
  760. if (!gpio_is_valid(gpio)) {
  761. dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
  762. return -EINVAL;
  763. }
  764. pdata->buck125_gpios[i] = gpio;
  765. }
  766. return 0;
  767. }
  768. static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
  769. struct max8997_platform_data *pdata)
  770. {
  771. struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  772. struct device_node *pmic_np, *regulators_np, *reg_np;
  773. struct max8997_regulator_data *rdata;
  774. unsigned int i, dvs_voltage_nr = 1, ret;
  775. pmic_np = iodev->dev->of_node;
  776. if (!pmic_np) {
  777. dev_err(&pdev->dev, "could not find pmic sub-node\n");
  778. return -ENODEV;
  779. }
  780. regulators_np = of_get_child_by_name(pmic_np, "regulators");
  781. if (!regulators_np) {
  782. dev_err(&pdev->dev, "could not find regulators sub-node\n");
  783. return -EINVAL;
  784. }
  785. /* count the number of regulators to be supported in pmic */
  786. pdata->num_regulators = of_get_child_count(regulators_np);
  787. rdata = devm_kcalloc(&pdev->dev,
  788. pdata->num_regulators, sizeof(*rdata),
  789. GFP_KERNEL);
  790. if (!rdata) {
  791. of_node_put(regulators_np);
  792. return -ENOMEM;
  793. }
  794. pdata->regulators = rdata;
  795. for_each_child_of_node(regulators_np, reg_np) {
  796. for (i = 0; i < ARRAY_SIZE(regulators); i++)
  797. if (of_node_name_eq(reg_np, regulators[i].name))
  798. break;
  799. if (i == ARRAY_SIZE(regulators)) {
  800. dev_warn(&pdev->dev, "don't know how to configure regulator %pOFn\n",
  801. reg_np);
  802. continue;
  803. }
  804. rdata->id = i;
  805. rdata->initdata = of_get_regulator_init_data(&pdev->dev,
  806. reg_np,
  807. &regulators[i]);
  808. rdata->reg_node = reg_np;
  809. rdata++;
  810. }
  811. of_node_put(regulators_np);
  812. if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
  813. pdata->buck1_gpiodvs = true;
  814. if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
  815. pdata->buck2_gpiodvs = true;
  816. if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
  817. pdata->buck5_gpiodvs = true;
  818. if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
  819. pdata->buck5_gpiodvs) {
  820. ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
  821. if (ret)
  822. return -EINVAL;
  823. if (of_property_read_u32(pmic_np,
  824. "max8997,pmic-buck125-default-dvs-idx",
  825. &pdata->buck125_default_idx)) {
  826. pdata->buck125_default_idx = 0;
  827. } else {
  828. if (pdata->buck125_default_idx >= 8) {
  829. pdata->buck125_default_idx = 0;
  830. dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
  831. }
  832. }
  833. if (of_get_property(pmic_np,
  834. "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
  835. pdata->ignore_gpiodvs_side_effect = true;
  836. dvs_voltage_nr = 8;
  837. }
  838. if (of_property_read_u32_array(pmic_np,
  839. "max8997,pmic-buck1-dvs-voltage",
  840. pdata->buck1_voltage, dvs_voltage_nr)) {
  841. dev_err(&pdev->dev, "buck1 voltages not specified\n");
  842. return -EINVAL;
  843. }
  844. if (of_property_read_u32_array(pmic_np,
  845. "max8997,pmic-buck2-dvs-voltage",
  846. pdata->buck2_voltage, dvs_voltage_nr)) {
  847. dev_err(&pdev->dev, "buck2 voltages not specified\n");
  848. return -EINVAL;
  849. }
  850. if (of_property_read_u32_array(pmic_np,
  851. "max8997,pmic-buck5-dvs-voltage",
  852. pdata->buck5_voltage, dvs_voltage_nr)) {
  853. dev_err(&pdev->dev, "buck5 voltages not specified\n");
  854. return -EINVAL;
  855. }
  856. return 0;
  857. }
  858. #else
  859. static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
  860. struct max8997_platform_data *pdata)
  861. {
  862. return 0;
  863. }
  864. #endif /* CONFIG_OF */
  865. static int max8997_pmic_probe(struct platform_device *pdev)
  866. {
  867. struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  868. struct max8997_platform_data *pdata = iodev->pdata;
  869. struct regulator_config config = { };
  870. struct regulator_dev *rdev;
  871. struct max8997_data *max8997;
  872. struct i2c_client *i2c;
  873. int i, ret, nr_dvs;
  874. u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
  875. if (!pdata) {
  876. dev_err(&pdev->dev, "No platform init data supplied.\n");
  877. return -ENODEV;
  878. }
  879. if (iodev->dev->of_node) {
  880. ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
  881. if (ret)
  882. return ret;
  883. }
  884. max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
  885. GFP_KERNEL);
  886. if (!max8997)
  887. return -ENOMEM;
  888. max8997->dev = &pdev->dev;
  889. max8997->iodev = iodev;
  890. max8997->num_regulators = pdata->num_regulators;
  891. platform_set_drvdata(pdev, max8997);
  892. i2c = max8997->iodev->i2c;
  893. max8997->buck125_gpioindex = pdata->buck125_default_idx;
  894. max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
  895. max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
  896. max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
  897. memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
  898. max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
  899. nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
  900. pdata->buck5_gpiodvs) ? 8 : 1;
  901. for (i = 0; i < nr_dvs; i++) {
  902. max8997->buck1_vol[i] = ret =
  903. max8997_get_voltage_proper_val(
  904. &buck1245_voltage_map_desc,
  905. pdata->buck1_voltage[i],
  906. pdata->buck1_voltage[i] +
  907. buck1245_voltage_map_desc.step);
  908. if (ret < 0)
  909. return ret;
  910. max8997->buck2_vol[i] = ret =
  911. max8997_get_voltage_proper_val(
  912. &buck1245_voltage_map_desc,
  913. pdata->buck2_voltage[i],
  914. pdata->buck2_voltage[i] +
  915. buck1245_voltage_map_desc.step);
  916. if (ret < 0)
  917. return ret;
  918. max8997->buck5_vol[i] = ret =
  919. max8997_get_voltage_proper_val(
  920. &buck1245_voltage_map_desc,
  921. pdata->buck5_voltage[i],
  922. pdata->buck5_voltage[i] +
  923. buck1245_voltage_map_desc.step);
  924. if (ret < 0)
  925. return ret;
  926. if (max_buck1 < max8997->buck1_vol[i])
  927. max_buck1 = max8997->buck1_vol[i];
  928. if (max_buck2 < max8997->buck2_vol[i])
  929. max_buck2 = max8997->buck2_vol[i];
  930. if (max_buck5 < max8997->buck5_vol[i])
  931. max_buck5 = max8997->buck5_vol[i];
  932. }
  933. /* For the safety, set max voltage before setting up */
  934. for (i = 0; i < 8; i++) {
  935. max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
  936. max_buck1, 0x3f);
  937. max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
  938. max_buck2, 0x3f);
  939. max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
  940. max_buck5, 0x3f);
  941. }
  942. /* Initialize all the DVS related BUCK registers */
  943. for (i = 0; i < nr_dvs; i++) {
  944. max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
  945. max8997->buck1_vol[i],
  946. 0x3f);
  947. max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
  948. max8997->buck2_vol[i],
  949. 0x3f);
  950. max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
  951. max8997->buck5_vol[i],
  952. 0x3f);
  953. }
  954. /*
  955. * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
  956. * If at least one of them cares, set gpios.
  957. */
  958. if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
  959. pdata->buck5_gpiodvs) {
  960. if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
  961. !gpio_is_valid(pdata->buck125_gpios[1]) ||
  962. !gpio_is_valid(pdata->buck125_gpios[2])) {
  963. dev_err(&pdev->dev, "GPIO NOT VALID\n");
  964. return -EINVAL;
  965. }
  966. ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
  967. "MAX8997 SET1");
  968. if (ret)
  969. return ret;
  970. ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
  971. "MAX8997 SET2");
  972. if (ret)
  973. return ret;
  974. ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
  975. "MAX8997 SET3");
  976. if (ret)
  977. return ret;
  978. gpio_direction_output(pdata->buck125_gpios[0],
  979. (max8997->buck125_gpioindex >> 2)
  980. & 0x1); /* SET1 */
  981. gpio_direction_output(pdata->buck125_gpios[1],
  982. (max8997->buck125_gpioindex >> 1)
  983. & 0x1); /* SET2 */
  984. gpio_direction_output(pdata->buck125_gpios[2],
  985. (max8997->buck125_gpioindex >> 0)
  986. & 0x1); /* SET3 */
  987. }
  988. /* DVS-GPIO disabled */
  989. max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
  990. (1 << 1) : (0 << 1), 1 << 1);
  991. max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
  992. (1 << 1) : (0 << 1), 1 << 1);
  993. max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
  994. (1 << 1) : (0 << 1), 1 << 1);
  995. /* Misc Settings */
  996. max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
  997. max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
  998. for (i = 0; i < pdata->num_regulators; i++) {
  999. const struct voltage_map_desc *desc;
  1000. int id = pdata->regulators[i].id;
  1001. desc = reg_voltage_map[id];
  1002. if (desc) {
  1003. regulators[id].n_voltages =
  1004. (desc->max - desc->min) / desc->step + 1;
  1005. } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
  1006. regulators[id].volt_table = safeoutvolt;
  1007. regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
  1008. } else if (id == MAX8997_CHARGER_CV) {
  1009. regulators[id].n_voltages = 16;
  1010. }
  1011. config.dev = max8997->dev;
  1012. config.init_data = pdata->regulators[i].initdata;
  1013. config.driver_data = max8997;
  1014. config.of_node = pdata->regulators[i].reg_node;
  1015. rdev = devm_regulator_register(&pdev->dev, &regulators[id],
  1016. &config);
  1017. if (IS_ERR(rdev)) {
  1018. dev_err(max8997->dev, "regulator init failed for %d\n",
  1019. id);
  1020. return PTR_ERR(rdev);
  1021. }
  1022. }
  1023. return 0;
  1024. }
  1025. static const struct platform_device_id max8997_pmic_id[] = {
  1026. { "max8997-pmic", 0},
  1027. { },
  1028. };
  1029. MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
  1030. static struct platform_driver max8997_pmic_driver = {
  1031. .driver = {
  1032. .name = "max8997-pmic",
  1033. },
  1034. .probe = max8997_pmic_probe,
  1035. .id_table = max8997_pmic_id,
  1036. };
  1037. static int __init max8997_pmic_init(void)
  1038. {
  1039. return platform_driver_register(&max8997_pmic_driver);
  1040. }
  1041. subsys_initcall(max8997_pmic_init);
  1042. static void __exit max8997_pmic_cleanup(void)
  1043. {
  1044. platform_driver_unregister(&max8997_pmic_driver);
  1045. }
  1046. module_exit(max8997_pmic_cleanup);
  1047. MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
  1048. MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
  1049. MODULE_LICENSE("GPL");