elan_i2c_i2c.c 16 KB

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  1. /*
  2. * Elan I2C/SMBus Touchpad driver - I2C interface
  3. *
  4. * Copyright (c) 2013 ELAN Microelectronics Corp.
  5. *
  6. * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
  7. *
  8. * Based on cyapa driver:
  9. * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  10. * copyright (c) 2011-2012 Google, Inc.
  11. *
  12. * This program is free software; you can redistribute it and/or modify it
  13. * under the terms of the GNU General Public License version 2 as published
  14. * by the Free Software Foundation.
  15. *
  16. * Trademarks are the property of their respective owners.
  17. */
  18. #include <linux/completion.h>
  19. #include <linux/delay.h>
  20. #include <linux/i2c.h>
  21. #include <linux/interrupt.h>
  22. #include <linux/jiffies.h>
  23. #include <linux/kernel.h>
  24. #include <linux/sched.h>
  25. #include <asm/unaligned.h>
  26. #include "elan_i2c.h"
  27. /* Elan i2c commands */
  28. #define ETP_I2C_RESET 0x0100
  29. #define ETP_I2C_WAKE_UP 0x0800
  30. #define ETP_I2C_SLEEP 0x0801
  31. #define ETP_I2C_DESC_CMD 0x0001
  32. #define ETP_I2C_REPORT_DESC_CMD 0x0002
  33. #define ETP_I2C_STAND_CMD 0x0005
  34. #define ETP_I2C_PATTERN_CMD 0x0100
  35. #define ETP_I2C_UNIQUEID_CMD 0x0101
  36. #define ETP_I2C_FW_VERSION_CMD 0x0102
  37. #define ETP_I2C_IC_TYPE_CMD 0x0103
  38. #define ETP_I2C_OSM_VERSION_CMD 0x0103
  39. #define ETP_I2C_NSM_VERSION_CMD 0x0104
  40. #define ETP_I2C_XY_TRACENUM_CMD 0x0105
  41. #define ETP_I2C_MAX_X_AXIS_CMD 0x0106
  42. #define ETP_I2C_MAX_Y_AXIS_CMD 0x0107
  43. #define ETP_I2C_RESOLUTION_CMD 0x0108
  44. #define ETP_I2C_PRESSURE_CMD 0x010A
  45. #define ETP_I2C_IAP_VERSION_CMD 0x0110
  46. #define ETP_I2C_SET_CMD 0x0300
  47. #define ETP_I2C_POWER_CMD 0x0307
  48. #define ETP_I2C_FW_CHECKSUM_CMD 0x030F
  49. #define ETP_I2C_IAP_CTRL_CMD 0x0310
  50. #define ETP_I2C_IAP_CMD 0x0311
  51. #define ETP_I2C_IAP_RESET_CMD 0x0314
  52. #define ETP_I2C_IAP_CHECKSUM_CMD 0x0315
  53. #define ETP_I2C_CALIBRATE_CMD 0x0316
  54. #define ETP_I2C_MAX_BASELINE_CMD 0x0317
  55. #define ETP_I2C_MIN_BASELINE_CMD 0x0318
  56. #define ETP_I2C_REPORT_LEN 34
  57. #define ETP_I2C_DESC_LENGTH 30
  58. #define ETP_I2C_REPORT_DESC_LENGTH 158
  59. #define ETP_I2C_INF_LENGTH 2
  60. #define ETP_I2C_IAP_PASSWORD 0x1EA5
  61. #define ETP_I2C_IAP_RESET 0xF0F0
  62. #define ETP_I2C_MAIN_MODE_ON (1 << 9)
  63. #define ETP_I2C_IAP_REG_L 0x01
  64. #define ETP_I2C_IAP_REG_H 0x06
  65. static int elan_i2c_read_block(struct i2c_client *client,
  66. u16 reg, u8 *val, u16 len)
  67. {
  68. __le16 buf[] = {
  69. cpu_to_le16(reg),
  70. };
  71. struct i2c_msg msgs[] = {
  72. {
  73. .addr = client->addr,
  74. .flags = client->flags & I2C_M_TEN,
  75. .len = sizeof(buf),
  76. .buf = (u8 *)buf,
  77. },
  78. {
  79. .addr = client->addr,
  80. .flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
  81. .len = len,
  82. .buf = val,
  83. }
  84. };
  85. int ret;
  86. ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
  87. return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
  88. }
  89. static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
  90. {
  91. int retval;
  92. retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
  93. if (retval < 0) {
  94. dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
  95. return retval;
  96. }
  97. return 0;
  98. }
  99. static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
  100. {
  101. __le16 buf[] = {
  102. cpu_to_le16(reg),
  103. cpu_to_le16(cmd),
  104. };
  105. struct i2c_msg msg = {
  106. .addr = client->addr,
  107. .flags = client->flags & I2C_M_TEN,
  108. .len = sizeof(buf),
  109. .buf = (u8 *)buf,
  110. };
  111. int ret;
  112. ret = i2c_transfer(client->adapter, &msg, 1);
  113. if (ret != 1) {
  114. if (ret >= 0)
  115. ret = -EIO;
  116. dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
  117. reg, ret);
  118. return ret;
  119. }
  120. return 0;
  121. }
  122. static int elan_i2c_initialize(struct i2c_client *client)
  123. {
  124. struct device *dev = &client->dev;
  125. int error;
  126. u8 val[256];
  127. error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
  128. if (error) {
  129. dev_err(dev, "device reset failed: %d\n", error);
  130. return error;
  131. }
  132. /* Wait for the device to reset */
  133. msleep(100);
  134. /* get reset acknowledgement 0000 */
  135. error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
  136. if (error < 0) {
  137. dev_err(dev, "failed to read reset response: %d\n", error);
  138. return error;
  139. }
  140. error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
  141. val, ETP_I2C_DESC_LENGTH);
  142. if (error) {
  143. dev_err(dev, "cannot get device descriptor: %d\n", error);
  144. return error;
  145. }
  146. error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
  147. val, ETP_I2C_REPORT_DESC_LENGTH);
  148. if (error) {
  149. dev_err(dev, "fetching report descriptor failed.: %d\n", error);
  150. return error;
  151. }
  152. return 0;
  153. }
  154. static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
  155. {
  156. return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
  157. sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
  158. }
  159. static int elan_i2c_power_control(struct i2c_client *client, bool enable)
  160. {
  161. u8 val[2];
  162. u16 reg;
  163. int error;
  164. error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
  165. if (error) {
  166. dev_err(&client->dev,
  167. "failed to read current power state: %d\n",
  168. error);
  169. return error;
  170. }
  171. reg = le16_to_cpup((__le16 *)val);
  172. if (enable)
  173. reg &= ~ETP_DISABLE_POWER;
  174. else
  175. reg |= ETP_DISABLE_POWER;
  176. error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg);
  177. if (error) {
  178. dev_err(&client->dev,
  179. "failed to write current power state: %d\n",
  180. error);
  181. return error;
  182. }
  183. return 0;
  184. }
  185. static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
  186. {
  187. return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
  188. }
  189. static int elan_i2c_calibrate(struct i2c_client *client)
  190. {
  191. return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
  192. }
  193. static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
  194. {
  195. return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
  196. }
  197. static int elan_i2c_get_baseline_data(struct i2c_client *client,
  198. bool max_baseline, u8 *value)
  199. {
  200. int error;
  201. u8 val[3];
  202. error = elan_i2c_read_cmd(client,
  203. max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
  204. ETP_I2C_MIN_BASELINE_CMD,
  205. val);
  206. if (error)
  207. return error;
  208. *value = le16_to_cpup((__le16 *)val);
  209. return 0;
  210. }
  211. static int elan_i2c_get_pattern(struct i2c_client *client, u8 *pattern)
  212. {
  213. int error;
  214. u8 val[3];
  215. error = elan_i2c_read_cmd(client, ETP_I2C_PATTERN_CMD, val);
  216. if (error) {
  217. dev_err(&client->dev, "failed to get pattern: %d\n", error);
  218. return error;
  219. }
  220. *pattern = val[1];
  221. return 0;
  222. }
  223. static int elan_i2c_get_version(struct i2c_client *client,
  224. bool iap, u8 *version)
  225. {
  226. int error;
  227. u8 pattern_ver;
  228. u8 val[3];
  229. error = elan_i2c_get_pattern(client, &pattern_ver);
  230. if (error) {
  231. dev_err(&client->dev, "failed to get pattern version\n");
  232. return error;
  233. }
  234. error = elan_i2c_read_cmd(client,
  235. iap ? ETP_I2C_IAP_VERSION_CMD :
  236. ETP_I2C_FW_VERSION_CMD,
  237. val);
  238. if (error) {
  239. dev_err(&client->dev, "failed to get %s version: %d\n",
  240. iap ? "IAP" : "FW", error);
  241. return error;
  242. }
  243. if (pattern_ver == 0x01)
  244. *version = iap ? val[1] : val[0];
  245. else
  246. *version = val[0];
  247. return 0;
  248. }
  249. static int elan_i2c_get_sm_version(struct i2c_client *client,
  250. u16 *ic_type, u8 *version,
  251. u8 *clickpad)
  252. {
  253. int error;
  254. u8 pattern_ver;
  255. u8 val[3];
  256. error = elan_i2c_get_pattern(client, &pattern_ver);
  257. if (error) {
  258. dev_err(&client->dev, "failed to get pattern version\n");
  259. return error;
  260. }
  261. if (pattern_ver == 0x01) {
  262. error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_CMD, val);
  263. if (error) {
  264. dev_err(&client->dev, "failed to get ic type: %d\n",
  265. error);
  266. return error;
  267. }
  268. *ic_type = be16_to_cpup((__be16 *)val);
  269. error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
  270. val);
  271. if (error) {
  272. dev_err(&client->dev, "failed to get SM version: %d\n",
  273. error);
  274. return error;
  275. }
  276. *version = val[1];
  277. *clickpad = val[0] & 0x10;
  278. } else {
  279. error = elan_i2c_read_cmd(client, ETP_I2C_OSM_VERSION_CMD, val);
  280. if (error) {
  281. dev_err(&client->dev, "failed to get SM version: %d\n",
  282. error);
  283. return error;
  284. }
  285. *version = val[0];
  286. *ic_type = val[1];
  287. error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
  288. val);
  289. if (error) {
  290. dev_err(&client->dev, "failed to get SM version: %d\n",
  291. error);
  292. return error;
  293. }
  294. *clickpad = val[0] & 0x10;
  295. }
  296. return 0;
  297. }
  298. static int elan_i2c_get_product_id(struct i2c_client *client, u16 *id)
  299. {
  300. int error;
  301. u8 val[3];
  302. error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
  303. if (error) {
  304. dev_err(&client->dev, "failed to get product ID: %d\n", error);
  305. return error;
  306. }
  307. *id = le16_to_cpup((__le16 *)val);
  308. return 0;
  309. }
  310. static int elan_i2c_get_checksum(struct i2c_client *client,
  311. bool iap, u16 *csum)
  312. {
  313. int error;
  314. u8 val[3];
  315. error = elan_i2c_read_cmd(client,
  316. iap ? ETP_I2C_IAP_CHECKSUM_CMD :
  317. ETP_I2C_FW_CHECKSUM_CMD,
  318. val);
  319. if (error) {
  320. dev_err(&client->dev, "failed to get %s checksum: %d\n",
  321. iap ? "IAP" : "FW", error);
  322. return error;
  323. }
  324. *csum = le16_to_cpup((__le16 *)val);
  325. return 0;
  326. }
  327. static int elan_i2c_get_max(struct i2c_client *client,
  328. unsigned int *max_x, unsigned int *max_y)
  329. {
  330. int error;
  331. u8 val[3];
  332. error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
  333. if (error) {
  334. dev_err(&client->dev, "failed to get X dimension: %d\n", error);
  335. return error;
  336. }
  337. *max_x = le16_to_cpup((__le16 *)val) & 0x0fff;
  338. error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
  339. if (error) {
  340. dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
  341. return error;
  342. }
  343. *max_y = le16_to_cpup((__le16 *)val) & 0x0fff;
  344. return 0;
  345. }
  346. static int elan_i2c_get_resolution(struct i2c_client *client,
  347. u8 *hw_res_x, u8 *hw_res_y)
  348. {
  349. int error;
  350. u8 val[3];
  351. error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
  352. if (error) {
  353. dev_err(&client->dev, "failed to get resolution: %d\n", error);
  354. return error;
  355. }
  356. *hw_res_x = val[0];
  357. *hw_res_y = val[1];
  358. return 0;
  359. }
  360. static int elan_i2c_get_num_traces(struct i2c_client *client,
  361. unsigned int *x_traces,
  362. unsigned int *y_traces)
  363. {
  364. int error;
  365. u8 val[3];
  366. error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
  367. if (error) {
  368. dev_err(&client->dev, "failed to get trace info: %d\n", error);
  369. return error;
  370. }
  371. *x_traces = val[0];
  372. *y_traces = val[1];
  373. return 0;
  374. }
  375. static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
  376. int *adjustment)
  377. {
  378. int error;
  379. u8 val[3];
  380. error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
  381. if (error) {
  382. dev_err(&client->dev, "failed to get pressure format: %d\n",
  383. error);
  384. return error;
  385. }
  386. if ((val[0] >> 4) & 0x1)
  387. *adjustment = 0;
  388. else
  389. *adjustment = ETP_PRESSURE_OFFSET;
  390. return 0;
  391. }
  392. static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
  393. {
  394. int error;
  395. u16 constant;
  396. u8 val[3];
  397. error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
  398. if (error) {
  399. dev_err(&client->dev,
  400. "failed to read iap control register: %d\n",
  401. error);
  402. return error;
  403. }
  404. constant = le16_to_cpup((__le16 *)val);
  405. dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
  406. *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
  407. return 0;
  408. }
  409. static int elan_i2c_iap_reset(struct i2c_client *client)
  410. {
  411. int error;
  412. error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
  413. ETP_I2C_IAP_RESET);
  414. if (error) {
  415. dev_err(&client->dev, "cannot reset IC: %d\n", error);
  416. return error;
  417. }
  418. return 0;
  419. }
  420. static int elan_i2c_set_flash_key(struct i2c_client *client)
  421. {
  422. int error;
  423. error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
  424. ETP_I2C_IAP_PASSWORD);
  425. if (error) {
  426. dev_err(&client->dev, "cannot set flash key: %d\n", error);
  427. return error;
  428. }
  429. return 0;
  430. }
  431. static int elan_i2c_prepare_fw_update(struct i2c_client *client)
  432. {
  433. struct device *dev = &client->dev;
  434. int error;
  435. enum tp_mode mode;
  436. u8 val[3];
  437. u16 password;
  438. /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
  439. error = elan_i2c_iap_get_mode(client, &mode);
  440. if (error)
  441. return error;
  442. if (mode == IAP_MODE) {
  443. /* Reset IC */
  444. error = elan_i2c_iap_reset(client);
  445. if (error)
  446. return error;
  447. msleep(30);
  448. }
  449. /* Set flash key*/
  450. error = elan_i2c_set_flash_key(client);
  451. if (error)
  452. return error;
  453. /* Wait for F/W IAP initialization */
  454. msleep(mode == MAIN_MODE ? 100 : 30);
  455. /* Check if we are in IAP mode or not */
  456. error = elan_i2c_iap_get_mode(client, &mode);
  457. if (error)
  458. return error;
  459. if (mode == MAIN_MODE) {
  460. dev_err(dev, "wrong mode: %d\n", mode);
  461. return -EIO;
  462. }
  463. /* Set flash key again */
  464. error = elan_i2c_set_flash_key(client);
  465. if (error)
  466. return error;
  467. /* Wait for F/W IAP initialization */
  468. msleep(30);
  469. /* read back to check we actually enabled successfully. */
  470. error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
  471. if (error) {
  472. dev_err(dev, "cannot read iap password: %d\n",
  473. error);
  474. return error;
  475. }
  476. password = le16_to_cpup((__le16 *)val);
  477. if (password != ETP_I2C_IAP_PASSWORD) {
  478. dev_err(dev, "wrong iap password: 0x%X\n", password);
  479. return -EIO;
  480. }
  481. return 0;
  482. }
  483. static int elan_i2c_write_fw_block(struct i2c_client *client,
  484. const u8 *page, u16 checksum, int idx)
  485. {
  486. struct device *dev = &client->dev;
  487. u8 page_store[ETP_FW_PAGE_SIZE + 4];
  488. u8 val[3];
  489. u16 result;
  490. int ret, error;
  491. page_store[0] = ETP_I2C_IAP_REG_L;
  492. page_store[1] = ETP_I2C_IAP_REG_H;
  493. memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
  494. /* recode checksum at last two bytes */
  495. put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]);
  496. ret = i2c_master_send(client, page_store, sizeof(page_store));
  497. if (ret != sizeof(page_store)) {
  498. error = ret < 0 ? ret : -EIO;
  499. dev_err(dev, "Failed to write page %d: %d\n", idx, error);
  500. return error;
  501. }
  502. /* Wait for F/W to update one page ROM data. */
  503. msleep(35);
  504. error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
  505. if (error) {
  506. dev_err(dev, "Failed to read IAP write result: %d\n", error);
  507. return error;
  508. }
  509. result = le16_to_cpup((__le16 *)val);
  510. if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
  511. dev_err(dev, "IAP reports failed write: %04hx\n",
  512. result);
  513. return -EIO;
  514. }
  515. return 0;
  516. }
  517. static int elan_i2c_finish_fw_update(struct i2c_client *client,
  518. struct completion *completion)
  519. {
  520. struct device *dev = &client->dev;
  521. int error;
  522. int len;
  523. u8 buffer[ETP_I2C_REPORT_LEN];
  524. len = i2c_master_recv(client, buffer, ETP_I2C_REPORT_LEN);
  525. if (len != ETP_I2C_REPORT_LEN) {
  526. error = len < 0 ? len : -EIO;
  527. dev_warn(dev, "failed to read I2C data after FW WDT reset: %d (%d)\n",
  528. error, len);
  529. }
  530. reinit_completion(completion);
  531. enable_irq(client->irq);
  532. error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
  533. if (error) {
  534. dev_err(dev, "device reset failed: %d\n", error);
  535. } else if (!wait_for_completion_timeout(completion,
  536. msecs_to_jiffies(300))) {
  537. dev_err(dev, "timeout waiting for device reset\n");
  538. error = -ETIMEDOUT;
  539. }
  540. disable_irq(client->irq);
  541. if (error)
  542. return error;
  543. len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
  544. if (len != ETP_I2C_INF_LENGTH) {
  545. error = len < 0 ? len : -EIO;
  546. dev_err(dev, "failed to read INT signal: %d (%d)\n",
  547. error, len);
  548. return error;
  549. }
  550. return 0;
  551. }
  552. static int elan_i2c_get_report(struct i2c_client *client, u8 *report)
  553. {
  554. int len;
  555. len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN);
  556. if (len < 0) {
  557. dev_err(&client->dev, "failed to read report data: %d\n", len);
  558. return len;
  559. }
  560. if (len != ETP_I2C_REPORT_LEN) {
  561. dev_err(&client->dev,
  562. "wrong report length (%d vs %d expected)\n",
  563. len, ETP_I2C_REPORT_LEN);
  564. return -EIO;
  565. }
  566. return 0;
  567. }
  568. const struct elan_transport_ops elan_i2c_ops = {
  569. .initialize = elan_i2c_initialize,
  570. .sleep_control = elan_i2c_sleep_control,
  571. .power_control = elan_i2c_power_control,
  572. .set_mode = elan_i2c_set_mode,
  573. .calibrate = elan_i2c_calibrate,
  574. .calibrate_result = elan_i2c_calibrate_result,
  575. .get_baseline_data = elan_i2c_get_baseline_data,
  576. .get_version = elan_i2c_get_version,
  577. .get_sm_version = elan_i2c_get_sm_version,
  578. .get_product_id = elan_i2c_get_product_id,
  579. .get_checksum = elan_i2c_get_checksum,
  580. .get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
  581. .get_max = elan_i2c_get_max,
  582. .get_resolution = elan_i2c_get_resolution,
  583. .get_num_traces = elan_i2c_get_num_traces,
  584. .iap_get_mode = elan_i2c_iap_get_mode,
  585. .iap_reset = elan_i2c_iap_reset,
  586. .prepare_fw_update = elan_i2c_prepare_fw_update,
  587. .write_fw_block = elan_i2c_write_fw_block,
  588. .finish_fw_update = elan_i2c_finish_fw_update,
  589. .get_pattern = elan_i2c_get_pattern,
  590. .get_report = elan_i2c_get_report,
  591. };