cypress_ps2.c 18 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Cypress Trackpad PS/2 mouse driver
  4. *
  5. * Copyright (c) 2012 Cypress Semiconductor Corporation.
  6. *
  7. * Author:
  8. * Dudley Du <dudl@cypress.com>
  9. *
  10. * Additional contributors include:
  11. * Kamal Mostafa <kamal@canonical.com>
  12. * Kyle Fazzari <git@status.e4ward.com>
  13. */
  14. #include <linux/module.h>
  15. #include <linux/kernel.h>
  16. #include <linux/slab.h>
  17. #include <linux/serio.h>
  18. #include <linux/libps2.h>
  19. #include <linux/input.h>
  20. #include <linux/input/mt.h>
  21. #include <linux/sched.h>
  22. #include <linux/wait.h>
  23. #include "cypress_ps2.h"
  24. #undef CYTP_DEBUG_VERBOSE /* define this and DEBUG for more verbose dump */
  25. static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
  26. {
  27. struct cytp_data *cytp = psmouse->private;
  28. cytp->pkt_size = n;
  29. }
  30. static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
  31. static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
  32. static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
  33. {
  34. struct ps2dev *ps2dev = &psmouse->ps2dev;
  35. if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
  36. psmouse_dbg(psmouse,
  37. "sending command 0x%02x failed, resp 0x%02x\n",
  38. value & 0xff, ps2dev->nak);
  39. if (ps2dev->nak == CYTP_PS2_RETRY)
  40. return CYTP_PS2_RETRY;
  41. else
  42. return CYTP_PS2_ERROR;
  43. }
  44. #ifdef CYTP_DEBUG_VERBOSE
  45. psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n",
  46. value & 0xff);
  47. #endif
  48. return 0;
  49. }
  50. static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
  51. unsigned char data)
  52. {
  53. struct ps2dev *ps2dev = &psmouse->ps2dev;
  54. int tries = CYTP_PS2_CMD_TRIES;
  55. int rc;
  56. ps2_begin_command(ps2dev);
  57. do {
  58. /*
  59. * Send extension command byte (0xE8 or 0xF3).
  60. * If sending the command fails, send recovery command
  61. * to make the device return to the ready state.
  62. */
  63. rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
  64. if (rc == CYTP_PS2_RETRY) {
  65. rc = cypress_ps2_sendbyte(psmouse, 0x00);
  66. if (rc == CYTP_PS2_RETRY)
  67. rc = cypress_ps2_sendbyte(psmouse, 0x0a);
  68. }
  69. if (rc == CYTP_PS2_ERROR)
  70. continue;
  71. rc = cypress_ps2_sendbyte(psmouse, data);
  72. if (rc == CYTP_PS2_RETRY)
  73. rc = cypress_ps2_sendbyte(psmouse, data);
  74. if (rc == CYTP_PS2_ERROR)
  75. continue;
  76. else
  77. break;
  78. } while (--tries > 0);
  79. ps2_end_command(ps2dev);
  80. return rc;
  81. }
  82. static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
  83. unsigned char cmd,
  84. unsigned char *param)
  85. {
  86. int rc;
  87. struct ps2dev *ps2dev = &psmouse->ps2dev;
  88. enum psmouse_state old_state;
  89. int pktsize;
  90. ps2_begin_command(ps2dev);
  91. old_state = psmouse->state;
  92. psmouse->state = PSMOUSE_CMD_MODE;
  93. psmouse->pktcnt = 0;
  94. pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
  95. memset(param, 0, pktsize);
  96. rc = cypress_ps2_sendbyte(psmouse, 0xe9);
  97. if (rc < 0)
  98. goto out;
  99. wait_event_timeout(ps2dev->wait,
  100. (psmouse->pktcnt >= pktsize),
  101. msecs_to_jiffies(CYTP_CMD_TIMEOUT));
  102. memcpy(param, psmouse->packet, pktsize);
  103. psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
  104. cmd, pktsize, param);
  105. out:
  106. psmouse->state = old_state;
  107. psmouse->pktcnt = 0;
  108. ps2_end_command(ps2dev);
  109. return rc;
  110. }
  111. static bool cypress_verify_cmd_state(struct psmouse *psmouse,
  112. unsigned char cmd, unsigned char *param)
  113. {
  114. bool rate_match = false;
  115. bool resolution_match = false;
  116. int i;
  117. /* callers will do further checking. */
  118. if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
  119. cmd == CYTP_CMD_STANDARD_MODE ||
  120. cmd == CYTP_CMD_READ_TP_METRICS)
  121. return true;
  122. if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
  123. (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
  124. for (i = 0; i < sizeof(cytp_resolution); i++)
  125. if (cytp_resolution[i] == param[1])
  126. resolution_match = true;
  127. for (i = 0; i < sizeof(cytp_rate); i++)
  128. if (cytp_rate[i] == param[2])
  129. rate_match = true;
  130. if (resolution_match && rate_match)
  131. return true;
  132. }
  133. psmouse_dbg(psmouse, "verify cmd state failed.\n");
  134. return false;
  135. }
  136. static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
  137. unsigned char *param)
  138. {
  139. int tries = CYTP_PS2_CMD_TRIES;
  140. int rc;
  141. psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
  142. cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
  143. DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
  144. do {
  145. cypress_ps2_ext_cmd(psmouse,
  146. PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
  147. cypress_ps2_ext_cmd(psmouse,
  148. PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
  149. cypress_ps2_ext_cmd(psmouse,
  150. PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
  151. cypress_ps2_ext_cmd(psmouse,
  152. PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
  153. rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
  154. if (rc)
  155. continue;
  156. if (cypress_verify_cmd_state(psmouse, cmd, param))
  157. return 0;
  158. } while (--tries > 0);
  159. return -EIO;
  160. }
  161. int cypress_detect(struct psmouse *psmouse, bool set_properties)
  162. {
  163. unsigned char param[3];
  164. if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
  165. return -ENODEV;
  166. /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
  167. if (param[0] != 0x33 || param[1] != 0xCC)
  168. return -ENODEV;
  169. if (set_properties) {
  170. psmouse->vendor = "Cypress";
  171. psmouse->name = "Trackpad";
  172. }
  173. return 0;
  174. }
  175. static int cypress_read_fw_version(struct psmouse *psmouse)
  176. {
  177. struct cytp_data *cytp = psmouse->private;
  178. unsigned char param[3];
  179. if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
  180. return -ENODEV;
  181. /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
  182. if (param[0] != 0x33 || param[1] != 0xCC)
  183. return -ENODEV;
  184. cytp->fw_version = param[2] & FW_VERSION_MASX;
  185. cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
  186. /*
  187. * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
  188. * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
  189. */
  190. if (cytp->fw_version >= 11)
  191. cytp->tp_metrics_supported = 0;
  192. psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
  193. psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
  194. cytp->tp_metrics_supported);
  195. return 0;
  196. }
  197. static int cypress_read_tp_metrics(struct psmouse *psmouse)
  198. {
  199. struct cytp_data *cytp = psmouse->private;
  200. unsigned char param[8];
  201. /* set default values for tp metrics. */
  202. cytp->tp_width = CYTP_DEFAULT_WIDTH;
  203. cytp->tp_high = CYTP_DEFAULT_HIGH;
  204. cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
  205. cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
  206. cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
  207. cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
  208. cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
  209. cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
  210. if (!cytp->tp_metrics_supported)
  211. return 0;
  212. memset(param, 0, sizeof(param));
  213. if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
  214. /* Update trackpad parameters. */
  215. cytp->tp_max_abs_x = (param[1] << 8) | param[0];
  216. cytp->tp_max_abs_y = (param[3] << 8) | param[2];
  217. cytp->tp_min_pressure = param[4];
  218. cytp->tp_max_pressure = param[5];
  219. }
  220. if (!cytp->tp_max_pressure ||
  221. cytp->tp_max_pressure < cytp->tp_min_pressure ||
  222. !cytp->tp_width || !cytp->tp_high ||
  223. !cytp->tp_max_abs_x ||
  224. cytp->tp_max_abs_x < cytp->tp_width ||
  225. !cytp->tp_max_abs_y ||
  226. cytp->tp_max_abs_y < cytp->tp_high)
  227. return -EINVAL;
  228. cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
  229. cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
  230. #ifdef CYTP_DEBUG_VERBOSE
  231. psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
  232. psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
  233. psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
  234. psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
  235. psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
  236. psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
  237. psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
  238. psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
  239. psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
  240. psmouse_dbg(psmouse, "tp_type_APA = %d\n",
  241. (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
  242. psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
  243. (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
  244. psmouse_dbg(psmouse, "tp_palm = %d\n",
  245. (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
  246. psmouse_dbg(psmouse, "tp_stubborn = %d\n",
  247. (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
  248. psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
  249. (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
  250. psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
  251. (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
  252. psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
  253. param[7] & TP_METRICS_BIT_1F_SPIKE);
  254. psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
  255. (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
  256. psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
  257. (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
  258. #endif
  259. return 0;
  260. }
  261. static int cypress_query_hardware(struct psmouse *psmouse)
  262. {
  263. int ret;
  264. ret = cypress_read_fw_version(psmouse);
  265. if (ret)
  266. return ret;
  267. ret = cypress_read_tp_metrics(psmouse);
  268. if (ret)
  269. return ret;
  270. return 0;
  271. }
  272. static int cypress_set_absolute_mode(struct psmouse *psmouse)
  273. {
  274. struct cytp_data *cytp = psmouse->private;
  275. unsigned char param[3];
  276. if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
  277. return -1;
  278. cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
  279. | CYTP_BIT_ABS_PRESSURE;
  280. cypress_set_packet_size(psmouse, 5);
  281. return 0;
  282. }
  283. /*
  284. * Reset trackpad device.
  285. * This is also the default mode when trackpad powered on.
  286. */
  287. static void cypress_reset(struct psmouse *psmouse)
  288. {
  289. struct cytp_data *cytp = psmouse->private;
  290. cytp->mode = 0;
  291. psmouse_reset(psmouse);
  292. }
  293. static int cypress_set_input_params(struct input_dev *input,
  294. struct cytp_data *cytp)
  295. {
  296. int ret;
  297. if (!cytp->tp_res_x || !cytp->tp_res_y)
  298. return -EINVAL;
  299. __set_bit(EV_ABS, input->evbit);
  300. input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
  301. input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
  302. input_set_abs_params(input, ABS_PRESSURE,
  303. cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
  304. input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
  305. /* finger position */
  306. input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
  307. input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
  308. input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
  309. ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
  310. INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
  311. if (ret < 0)
  312. return ret;
  313. __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
  314. input_abs_set_res(input, ABS_X, cytp->tp_res_x);
  315. input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
  316. input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
  317. input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
  318. __set_bit(BTN_TOUCH, input->keybit);
  319. __set_bit(BTN_TOOL_FINGER, input->keybit);
  320. __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
  321. __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
  322. __set_bit(BTN_TOOL_QUADTAP, input->keybit);
  323. __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
  324. __clear_bit(EV_REL, input->evbit);
  325. __clear_bit(REL_X, input->relbit);
  326. __clear_bit(REL_Y, input->relbit);
  327. __set_bit(EV_KEY, input->evbit);
  328. __set_bit(BTN_LEFT, input->keybit);
  329. __set_bit(BTN_RIGHT, input->keybit);
  330. __set_bit(BTN_MIDDLE, input->keybit);
  331. return 0;
  332. }
  333. static int cypress_get_finger_count(unsigned char header_byte)
  334. {
  335. unsigned char bits6_7;
  336. int finger_count;
  337. bits6_7 = header_byte >> 6;
  338. finger_count = bits6_7 & 0x03;
  339. if (finger_count == 1)
  340. return 1;
  341. if (header_byte & ABS_HSCROLL_BIT) {
  342. /* HSCROLL gets added on to 0 finger count. */
  343. switch (finger_count) {
  344. case 0: return 4;
  345. case 2: return 5;
  346. default:
  347. /* Invalid contact (e.g. palm). Ignore it. */
  348. return 0;
  349. }
  350. }
  351. return finger_count;
  352. }
  353. static int cypress_parse_packet(struct psmouse *psmouse,
  354. struct cytp_data *cytp, struct cytp_report_data *report_data)
  355. {
  356. unsigned char *packet = psmouse->packet;
  357. unsigned char header_byte = packet[0];
  358. memset(report_data, 0, sizeof(struct cytp_report_data));
  359. report_data->contact_cnt = cypress_get_finger_count(header_byte);
  360. report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
  361. if (report_data->contact_cnt == 1) {
  362. report_data->contacts[0].x =
  363. ((packet[1] & 0x70) << 4) | packet[2];
  364. report_data->contacts[0].y =
  365. ((packet[1] & 0x07) << 8) | packet[3];
  366. if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
  367. report_data->contacts[0].z = packet[4];
  368. } else if (report_data->contact_cnt >= 2) {
  369. report_data->contacts[0].x =
  370. ((packet[1] & 0x70) << 4) | packet[2];
  371. report_data->contacts[0].y =
  372. ((packet[1] & 0x07) << 8) | packet[3];
  373. if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
  374. report_data->contacts[0].z = packet[4];
  375. report_data->contacts[1].x =
  376. ((packet[5] & 0xf0) << 4) | packet[6];
  377. report_data->contacts[1].y =
  378. ((packet[5] & 0x0f) << 8) | packet[7];
  379. if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
  380. report_data->contacts[1].z = report_data->contacts[0].z;
  381. }
  382. report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
  383. report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
  384. /*
  385. * This is only true if one of the mouse buttons were tapped. Make
  386. * sure it doesn't turn into a click. The regular tap-to-click
  387. * functionality will handle that on its own. If we don't do this,
  388. * disabling tap-to-click won't affect the mouse button zones.
  389. */
  390. if (report_data->tap)
  391. report_data->left = 0;
  392. #ifdef CYTP_DEBUG_VERBOSE
  393. {
  394. int i;
  395. int n = report_data->contact_cnt;
  396. psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
  397. psmouse_dbg(psmouse, "contact_cnt = %d\n",
  398. report_data->contact_cnt);
  399. if (n > CYTP_MAX_MT_SLOTS)
  400. n = CYTP_MAX_MT_SLOTS;
  401. for (i = 0; i < n; i++)
  402. psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
  403. report_data->contacts[i].x,
  404. report_data->contacts[i].y,
  405. report_data->contacts[i].z);
  406. psmouse_dbg(psmouse, "left = %d\n", report_data->left);
  407. psmouse_dbg(psmouse, "right = %d\n", report_data->right);
  408. psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
  409. }
  410. #endif
  411. return 0;
  412. }
  413. static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
  414. {
  415. int i;
  416. struct input_dev *input = psmouse->dev;
  417. struct cytp_data *cytp = psmouse->private;
  418. struct cytp_report_data report_data;
  419. struct cytp_contact *contact;
  420. struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
  421. int slots[CYTP_MAX_MT_SLOTS];
  422. int n;
  423. cypress_parse_packet(psmouse, cytp, &report_data);
  424. n = report_data.contact_cnt;
  425. if (n > CYTP_MAX_MT_SLOTS)
  426. n = CYTP_MAX_MT_SLOTS;
  427. for (i = 0; i < n; i++) {
  428. contact = &report_data.contacts[i];
  429. pos[i].x = contact->x;
  430. pos[i].y = contact->y;
  431. }
  432. input_mt_assign_slots(input, slots, pos, n, 0);
  433. for (i = 0; i < n; i++) {
  434. contact = &report_data.contacts[i];
  435. input_mt_slot(input, slots[i]);
  436. input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
  437. input_report_abs(input, ABS_MT_POSITION_X, contact->x);
  438. input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
  439. input_report_abs(input, ABS_MT_PRESSURE, contact->z);
  440. }
  441. input_mt_sync_frame(input);
  442. input_mt_report_finger_count(input, report_data.contact_cnt);
  443. input_report_key(input, BTN_LEFT, report_data.left);
  444. input_report_key(input, BTN_RIGHT, report_data.right);
  445. input_report_key(input, BTN_MIDDLE, report_data.middle);
  446. input_sync(input);
  447. }
  448. static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
  449. {
  450. int contact_cnt;
  451. int index = psmouse->pktcnt - 1;
  452. unsigned char *packet = psmouse->packet;
  453. struct cytp_data *cytp = psmouse->private;
  454. if (index < 0 || index > cytp->pkt_size)
  455. return PSMOUSE_BAD_DATA;
  456. if (index == 0 && (packet[0] & 0xfc) == 0) {
  457. /* call packet process for reporting finger leave. */
  458. cypress_process_packet(psmouse, 1);
  459. return PSMOUSE_FULL_PACKET;
  460. }
  461. /*
  462. * Perform validation (and adjust packet size) based only on the
  463. * first byte; allow all further bytes through.
  464. */
  465. if (index != 0)
  466. return PSMOUSE_GOOD_DATA;
  467. /*
  468. * If absolute/relative mode bit has not been set yet, just pass
  469. * the byte through.
  470. */
  471. if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
  472. return PSMOUSE_GOOD_DATA;
  473. if ((packet[0] & 0x08) == 0x08)
  474. return PSMOUSE_BAD_DATA;
  475. contact_cnt = cypress_get_finger_count(packet[0]);
  476. if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
  477. cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
  478. else
  479. cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
  480. return PSMOUSE_GOOD_DATA;
  481. }
  482. static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
  483. {
  484. struct cytp_data *cytp = psmouse->private;
  485. if (psmouse->pktcnt >= cytp->pkt_size) {
  486. cypress_process_packet(psmouse, 0);
  487. return PSMOUSE_FULL_PACKET;
  488. }
  489. return cypress_validate_byte(psmouse);
  490. }
  491. static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
  492. {
  493. struct cytp_data *cytp = psmouse->private;
  494. if (rate >= 80) {
  495. psmouse->rate = 80;
  496. cytp->mode |= CYTP_BIT_HIGH_RATE;
  497. } else {
  498. psmouse->rate = 40;
  499. cytp->mode &= ~CYTP_BIT_HIGH_RATE;
  500. }
  501. ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
  502. PSMOUSE_CMD_SETRATE);
  503. }
  504. static void cypress_disconnect(struct psmouse *psmouse)
  505. {
  506. cypress_reset(psmouse);
  507. kfree(psmouse->private);
  508. psmouse->private = NULL;
  509. }
  510. static int cypress_reconnect(struct psmouse *psmouse)
  511. {
  512. int tries = CYTP_PS2_CMD_TRIES;
  513. int rc;
  514. do {
  515. cypress_reset(psmouse);
  516. rc = cypress_detect(psmouse, false);
  517. } while (rc && (--tries > 0));
  518. if (rc) {
  519. psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
  520. return -1;
  521. }
  522. if (cypress_set_absolute_mode(psmouse)) {
  523. psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
  524. return -1;
  525. }
  526. return 0;
  527. }
  528. int cypress_init(struct psmouse *psmouse)
  529. {
  530. struct cytp_data *cytp;
  531. cytp = kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
  532. if (!cytp)
  533. return -ENOMEM;
  534. psmouse->private = cytp;
  535. psmouse->pktsize = 8;
  536. cypress_reset(psmouse);
  537. if (cypress_query_hardware(psmouse)) {
  538. psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
  539. goto err_exit;
  540. }
  541. if (cypress_set_absolute_mode(psmouse)) {
  542. psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
  543. goto err_exit;
  544. }
  545. if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
  546. psmouse_err(psmouse, "init: Unable to set input params.\n");
  547. goto err_exit;
  548. }
  549. psmouse->model = 1;
  550. psmouse->protocol_handler = cypress_protocol_handler;
  551. psmouse->set_rate = cypress_set_rate;
  552. psmouse->disconnect = cypress_disconnect;
  553. psmouse->reconnect = cypress_reconnect;
  554. psmouse->cleanup = cypress_reset;
  555. psmouse->resync_time = 0;
  556. return 0;
  557. err_exit:
  558. /*
  559. * Reset Cypress Trackpad as a standard mouse. Then
  560. * let psmouse driver commmunicating with it as default PS2 mouse.
  561. */
  562. cypress_reset(psmouse);
  563. psmouse->private = NULL;
  564. kfree(cytp);
  565. return -1;
  566. }