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
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/serio.h>
19 #include <linux/libps2.h>
20 #include <linux/input.h>
21 #include <linux/input/mt.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24
25 #include "cypress_ps2.h"
26
27 #undef CYTP_DEBUG_VERBOSE /* define this and DEBUG for more verbose dump */
28
cypress_set_packet_size(struct psmouse * psmouse,unsigned int n)29 static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
30 {
31 struct cytp_data *cytp = psmouse->private;
32 cytp->pkt_size = n;
33 }
34
35 static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
36 static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
37
cypress_ps2_sendbyte(struct psmouse * psmouse,int value)38 static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
39 {
40 struct ps2dev *ps2dev = &psmouse->ps2dev;
41
42 if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
43 psmouse_dbg(psmouse,
44 "sending command 0x%02x failed, resp 0x%02x\n",
45 value & 0xff, ps2dev->nak);
46 if (ps2dev->nak == CYTP_PS2_RETRY)
47 return CYTP_PS2_RETRY;
48 else
49 return CYTP_PS2_ERROR;
50 }
51
52 #ifdef CYTP_DEBUG_VERBOSE
53 psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n",
54 value & 0xff);
55 #endif
56
57 return 0;
58 }
59
cypress_ps2_ext_cmd(struct psmouse * psmouse,unsigned short cmd,unsigned char data)60 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
61 unsigned char data)
62 {
63 struct ps2dev *ps2dev = &psmouse->ps2dev;
64 int tries = CYTP_PS2_CMD_TRIES;
65 int rc;
66
67 ps2_begin_command(ps2dev);
68
69 do {
70 /*
71 * Send extension command byte (0xE8 or 0xF3).
72 * If sending the command fails, send recovery command
73 * to make the device return to the ready state.
74 */
75 rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
76 if (rc == CYTP_PS2_RETRY) {
77 rc = cypress_ps2_sendbyte(psmouse, 0x00);
78 if (rc == CYTP_PS2_RETRY)
79 rc = cypress_ps2_sendbyte(psmouse, 0x0a);
80 }
81 if (rc == CYTP_PS2_ERROR)
82 continue;
83
84 rc = cypress_ps2_sendbyte(psmouse, data);
85 if (rc == CYTP_PS2_RETRY)
86 rc = cypress_ps2_sendbyte(psmouse, data);
87 if (rc == CYTP_PS2_ERROR)
88 continue;
89 else
90 break;
91 } while (--tries > 0);
92
93 ps2_end_command(ps2dev);
94
95 return rc;
96 }
97
cypress_ps2_read_cmd_status(struct psmouse * psmouse,unsigned char cmd,unsigned char * param)98 static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
99 unsigned char cmd,
100 unsigned char *param)
101 {
102 int rc;
103 struct ps2dev *ps2dev = &psmouse->ps2dev;
104 enum psmouse_state old_state;
105 int pktsize;
106
107 ps2_begin_command(ps2dev);
108
109 old_state = psmouse->state;
110 psmouse->state = PSMOUSE_CMD_MODE;
111 psmouse->pktcnt = 0;
112
113 pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
114 memset(param, 0, pktsize);
115
116 rc = cypress_ps2_sendbyte(psmouse, 0xe9);
117 if (rc < 0)
118 goto out;
119
120 wait_event_timeout(ps2dev->wait,
121 (psmouse->pktcnt >= pktsize),
122 msecs_to_jiffies(CYTP_CMD_TIMEOUT));
123
124 memcpy(param, psmouse->packet, pktsize);
125
126 psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
127 cmd, pktsize, param);
128
129 out:
130 psmouse->state = old_state;
131 psmouse->pktcnt = 0;
132
133 ps2_end_command(ps2dev);
134
135 return rc;
136 }
137
cypress_verify_cmd_state(struct psmouse * psmouse,unsigned char cmd,unsigned char * param)138 static bool cypress_verify_cmd_state(struct psmouse *psmouse,
139 unsigned char cmd, unsigned char *param)
140 {
141 bool rate_match = false;
142 bool resolution_match = false;
143 int i;
144
145 /* callers will do further checking. */
146 if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
147 cmd == CYTP_CMD_STANDARD_MODE ||
148 cmd == CYTP_CMD_READ_TP_METRICS)
149 return true;
150
151 if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
152 (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
153 for (i = 0; i < sizeof(cytp_resolution); i++)
154 if (cytp_resolution[i] == param[1])
155 resolution_match = true;
156
157 for (i = 0; i < sizeof(cytp_rate); i++)
158 if (cytp_rate[i] == param[2])
159 rate_match = true;
160
161 if (resolution_match && rate_match)
162 return true;
163 }
164
165 psmouse_dbg(psmouse, "verify cmd state failed.\n");
166 return false;
167 }
168
cypress_send_ext_cmd(struct psmouse * psmouse,unsigned char cmd,unsigned char * param)169 static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
170 unsigned char *param)
171 {
172 int tries = CYTP_PS2_CMD_TRIES;
173 int rc;
174
175 psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
176 cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
177 DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
178
179 do {
180 cypress_ps2_ext_cmd(psmouse,
181 PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
182 cypress_ps2_ext_cmd(psmouse,
183 PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
184 cypress_ps2_ext_cmd(psmouse,
185 PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
186 cypress_ps2_ext_cmd(psmouse,
187 PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
188
189 rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
190 if (rc)
191 continue;
192
193 if (cypress_verify_cmd_state(psmouse, cmd, param))
194 return 0;
195
196 } while (--tries > 0);
197
198 return -EIO;
199 }
200
cypress_detect(struct psmouse * psmouse,bool set_properties)201 int cypress_detect(struct psmouse *psmouse, bool set_properties)
202 {
203 unsigned char param[3];
204
205 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
206 return -ENODEV;
207
208 /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
209 if (param[0] != 0x33 || param[1] != 0xCC)
210 return -ENODEV;
211
212 if (set_properties) {
213 psmouse->vendor = "Cypress";
214 psmouse->name = "Trackpad";
215 }
216
217 return 0;
218 }
219
cypress_read_fw_version(struct psmouse * psmouse)220 static int cypress_read_fw_version(struct psmouse *psmouse)
221 {
222 struct cytp_data *cytp = psmouse->private;
223 unsigned char param[3];
224
225 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
226 return -ENODEV;
227
228 /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
229 if (param[0] != 0x33 || param[1] != 0xCC)
230 return -ENODEV;
231
232 cytp->fw_version = param[2] & FW_VERSION_MASX;
233 cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
234
235 /*
236 * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
237 * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
238 */
239 if (cytp->fw_version >= 11)
240 cytp->tp_metrics_supported = 0;
241
242 psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
243 psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
244 cytp->tp_metrics_supported);
245
246 return 0;
247 }
248
cypress_read_tp_metrics(struct psmouse * psmouse)249 static int cypress_read_tp_metrics(struct psmouse *psmouse)
250 {
251 struct cytp_data *cytp = psmouse->private;
252 unsigned char param[8];
253
254 /* set default values for tp metrics. */
255 cytp->tp_width = CYTP_DEFAULT_WIDTH;
256 cytp->tp_high = CYTP_DEFAULT_HIGH;
257 cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
258 cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
259 cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
260 cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
261 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
262 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
263
264 if (!cytp->tp_metrics_supported)
265 return 0;
266
267 memset(param, 0, sizeof(param));
268 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
269 /* Update trackpad parameters. */
270 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
271 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
272 cytp->tp_min_pressure = param[4];
273 cytp->tp_max_pressure = param[5];
274 }
275
276 if (!cytp->tp_max_pressure ||
277 cytp->tp_max_pressure < cytp->tp_min_pressure ||
278 !cytp->tp_width || !cytp->tp_high ||
279 !cytp->tp_max_abs_x ||
280 cytp->tp_max_abs_x < cytp->tp_width ||
281 !cytp->tp_max_abs_y ||
282 cytp->tp_max_abs_y < cytp->tp_high)
283 return -EINVAL;
284
285 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
286 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
287
288 #ifdef CYTP_DEBUG_VERBOSE
289 psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
290 psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
291 psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
292 psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
293 psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
294 psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
295 psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
296 psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
297 psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
298
299 psmouse_dbg(psmouse, "tp_type_APA = %d\n",
300 (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
301 psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
302 (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
303 psmouse_dbg(psmouse, "tp_palm = %d\n",
304 (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
305 psmouse_dbg(psmouse, "tp_stubborn = %d\n",
306 (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
307 psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
308 (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
309 psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
310 (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
311 psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
312 param[7] & TP_METRICS_BIT_1F_SPIKE);
313 psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
314 (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
315 psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
316 (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
317 #endif
318
319 return 0;
320 }
321
cypress_query_hardware(struct psmouse * psmouse)322 static int cypress_query_hardware(struct psmouse *psmouse)
323 {
324 int ret;
325
326 ret = cypress_read_fw_version(psmouse);
327 if (ret)
328 return ret;
329
330 ret = cypress_read_tp_metrics(psmouse);
331 if (ret)
332 return ret;
333
334 return 0;
335 }
336
cypress_set_absolute_mode(struct psmouse * psmouse)337 static int cypress_set_absolute_mode(struct psmouse *psmouse)
338 {
339 struct cytp_data *cytp = psmouse->private;
340 unsigned char param[3];
341
342 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
343 return -1;
344
345 cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
346 | CYTP_BIT_ABS_PRESSURE;
347 cypress_set_packet_size(psmouse, 5);
348
349 return 0;
350 }
351
352 /*
353 * Reset trackpad device.
354 * This is also the default mode when trackpad powered on.
355 */
cypress_reset(struct psmouse * psmouse)356 static void cypress_reset(struct psmouse *psmouse)
357 {
358 struct cytp_data *cytp = psmouse->private;
359
360 cytp->mode = 0;
361
362 psmouse_reset(psmouse);
363 }
364
cypress_set_input_params(struct input_dev * input,struct cytp_data * cytp)365 static int cypress_set_input_params(struct input_dev *input,
366 struct cytp_data *cytp)
367 {
368 int ret;
369
370 if (!cytp->tp_res_x || !cytp->tp_res_y)
371 return -EINVAL;
372
373 __set_bit(EV_ABS, input->evbit);
374 input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
375 input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
376 input_set_abs_params(input, ABS_PRESSURE,
377 cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
378 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
379
380 /* finger position */
381 input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
382 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
383 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
384
385 ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
386 INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
387 if (ret < 0)
388 return ret;
389
390 __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
391
392 input_abs_set_res(input, ABS_X, cytp->tp_res_x);
393 input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
394
395 input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
396 input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
397
398 __set_bit(BTN_TOUCH, input->keybit);
399 __set_bit(BTN_TOOL_FINGER, input->keybit);
400 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
401 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
402 __set_bit(BTN_TOOL_QUADTAP, input->keybit);
403 __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
404
405 __clear_bit(EV_REL, input->evbit);
406 __clear_bit(REL_X, input->relbit);
407 __clear_bit(REL_Y, input->relbit);
408
409 __set_bit(EV_KEY, input->evbit);
410 __set_bit(BTN_LEFT, input->keybit);
411 __set_bit(BTN_RIGHT, input->keybit);
412 __set_bit(BTN_MIDDLE, input->keybit);
413
414 return 0;
415 }
416
cypress_get_finger_count(unsigned char header_byte)417 static int cypress_get_finger_count(unsigned char header_byte)
418 {
419 unsigned char bits6_7;
420 int finger_count;
421
422 bits6_7 = header_byte >> 6;
423 finger_count = bits6_7 & 0x03;
424
425 if (finger_count == 1)
426 return 1;
427
428 if (header_byte & ABS_HSCROLL_BIT) {
429 /* HSCROLL gets added on to 0 finger count. */
430 switch (finger_count) {
431 case 0: return 4;
432 case 2: return 5;
433 default:
434 /* Invalid contact (e.g. palm). Ignore it. */
435 return 0;
436 }
437 }
438
439 return finger_count;
440 }
441
442
cypress_parse_packet(struct psmouse * psmouse,struct cytp_data * cytp,struct cytp_report_data * report_data)443 static int cypress_parse_packet(struct psmouse *psmouse,
444 struct cytp_data *cytp, struct cytp_report_data *report_data)
445 {
446 unsigned char *packet = psmouse->packet;
447 unsigned char header_byte = packet[0];
448
449 memset(report_data, 0, sizeof(struct cytp_report_data));
450
451 report_data->contact_cnt = cypress_get_finger_count(header_byte);
452 report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
453
454 if (report_data->contact_cnt == 1) {
455 report_data->contacts[0].x =
456 ((packet[1] & 0x70) << 4) | packet[2];
457 report_data->contacts[0].y =
458 ((packet[1] & 0x07) << 8) | packet[3];
459 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
460 report_data->contacts[0].z = packet[4];
461
462 } else if (report_data->contact_cnt >= 2) {
463 report_data->contacts[0].x =
464 ((packet[1] & 0x70) << 4) | packet[2];
465 report_data->contacts[0].y =
466 ((packet[1] & 0x07) << 8) | packet[3];
467 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
468 report_data->contacts[0].z = packet[4];
469
470 report_data->contacts[1].x =
471 ((packet[5] & 0xf0) << 4) | packet[6];
472 report_data->contacts[1].y =
473 ((packet[5] & 0x0f) << 8) | packet[7];
474 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
475 report_data->contacts[1].z = report_data->contacts[0].z;
476 }
477
478 report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
479 report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
480
481 /*
482 * This is only true if one of the mouse buttons were tapped. Make
483 * sure it doesn't turn into a click. The regular tap-to-click
484 * functionality will handle that on its own. If we don't do this,
485 * disabling tap-to-click won't affect the mouse button zones.
486 */
487 if (report_data->tap)
488 report_data->left = 0;
489
490 #ifdef CYTP_DEBUG_VERBOSE
491 {
492 int i;
493 int n = report_data->contact_cnt;
494 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
495 psmouse_dbg(psmouse, "contact_cnt = %d\n",
496 report_data->contact_cnt);
497 if (n > CYTP_MAX_MT_SLOTS)
498 n = CYTP_MAX_MT_SLOTS;
499 for (i = 0; i < n; i++)
500 psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
501 report_data->contacts[i].x,
502 report_data->contacts[i].y,
503 report_data->contacts[i].z);
504 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
505 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
506 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
507 }
508 #endif
509
510 return 0;
511 }
512
cypress_process_packet(struct psmouse * psmouse,bool zero_pkt)513 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
514 {
515 int i;
516 struct input_dev *input = psmouse->dev;
517 struct cytp_data *cytp = psmouse->private;
518 struct cytp_report_data report_data;
519 struct cytp_contact *contact;
520 struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
521 int slots[CYTP_MAX_MT_SLOTS];
522 int n;
523
524 cypress_parse_packet(psmouse, cytp, &report_data);
525
526 n = report_data.contact_cnt;
527 if (n > CYTP_MAX_MT_SLOTS)
528 n = CYTP_MAX_MT_SLOTS;
529
530 for (i = 0; i < n; i++) {
531 contact = &report_data.contacts[i];
532 pos[i].x = contact->x;
533 pos[i].y = contact->y;
534 }
535
536 input_mt_assign_slots(input, slots, pos, n, 0);
537
538 for (i = 0; i < n; i++) {
539 contact = &report_data.contacts[i];
540 input_mt_slot(input, slots[i]);
541 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
542 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
543 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
544 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
545 }
546
547 input_mt_sync_frame(input);
548
549 input_mt_report_finger_count(input, report_data.contact_cnt);
550
551 input_report_key(input, BTN_LEFT, report_data.left);
552 input_report_key(input, BTN_RIGHT, report_data.right);
553 input_report_key(input, BTN_MIDDLE, report_data.middle);
554
555 input_sync(input);
556 }
557
cypress_validate_byte(struct psmouse * psmouse)558 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
559 {
560 int contact_cnt;
561 int index = psmouse->pktcnt - 1;
562 unsigned char *packet = psmouse->packet;
563 struct cytp_data *cytp = psmouse->private;
564
565 if (index < 0 || index > cytp->pkt_size)
566 return PSMOUSE_BAD_DATA;
567
568 if (index == 0 && (packet[0] & 0xfc) == 0) {
569 /* call packet process for reporting finger leave. */
570 cypress_process_packet(psmouse, 1);
571 return PSMOUSE_FULL_PACKET;
572 }
573
574 /*
575 * Perform validation (and adjust packet size) based only on the
576 * first byte; allow all further bytes through.
577 */
578 if (index != 0)
579 return PSMOUSE_GOOD_DATA;
580
581 /*
582 * If absolute/relative mode bit has not been set yet, just pass
583 * the byte through.
584 */
585 if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
586 return PSMOUSE_GOOD_DATA;
587
588 if ((packet[0] & 0x08) == 0x08)
589 return PSMOUSE_BAD_DATA;
590
591 contact_cnt = cypress_get_finger_count(packet[0]);
592 if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
593 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
594 else
595 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
596
597 return PSMOUSE_GOOD_DATA;
598 }
599
cypress_protocol_handler(struct psmouse * psmouse)600 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
601 {
602 struct cytp_data *cytp = psmouse->private;
603
604 if (psmouse->pktcnt >= cytp->pkt_size) {
605 cypress_process_packet(psmouse, 0);
606 return PSMOUSE_FULL_PACKET;
607 }
608
609 return cypress_validate_byte(psmouse);
610 }
611
cypress_set_rate(struct psmouse * psmouse,unsigned int rate)612 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
613 {
614 struct cytp_data *cytp = psmouse->private;
615
616 if (rate >= 80) {
617 psmouse->rate = 80;
618 cytp->mode |= CYTP_BIT_HIGH_RATE;
619 } else {
620 psmouse->rate = 40;
621 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
622 }
623
624 ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
625 PSMOUSE_CMD_SETRATE);
626 }
627
cypress_disconnect(struct psmouse * psmouse)628 static void cypress_disconnect(struct psmouse *psmouse)
629 {
630 cypress_reset(psmouse);
631 kfree(psmouse->private);
632 psmouse->private = NULL;
633 }
634
cypress_reconnect(struct psmouse * psmouse)635 static int cypress_reconnect(struct psmouse *psmouse)
636 {
637 int tries = CYTP_PS2_CMD_TRIES;
638 int rc;
639
640 do {
641 cypress_reset(psmouse);
642 rc = cypress_detect(psmouse, false);
643 } while (rc && (--tries > 0));
644
645 if (rc) {
646 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
647 return -1;
648 }
649
650 if (cypress_set_absolute_mode(psmouse)) {
651 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
652 return -1;
653 }
654
655 return 0;
656 }
657
cypress_init(struct psmouse * psmouse)658 int cypress_init(struct psmouse *psmouse)
659 {
660 struct cytp_data *cytp;
661
662 cytp = kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
663 if (!cytp)
664 return -ENOMEM;
665
666 psmouse->private = cytp;
667 psmouse->pktsize = 8;
668
669 cypress_reset(psmouse);
670
671 if (cypress_query_hardware(psmouse)) {
672 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
673 goto err_exit;
674 }
675
676 if (cypress_set_absolute_mode(psmouse)) {
677 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
678 goto err_exit;
679 }
680
681 if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
682 psmouse_err(psmouse, "init: Unable to set input params.\n");
683 goto err_exit;
684 }
685
686 psmouse->model = 1;
687 psmouse->protocol_handler = cypress_protocol_handler;
688 psmouse->set_rate = cypress_set_rate;
689 psmouse->disconnect = cypress_disconnect;
690 psmouse->reconnect = cypress_reconnect;
691 psmouse->cleanup = cypress_reset;
692 psmouse->resync_time = 0;
693
694 return 0;
695
696 err_exit:
697 /*
698 * Reset Cypress Trackpad as a standard mouse. Then
699 * let psmouse driver communicating with it as default PS2 mouse.
700 */
701 cypress_reset(psmouse);
702
703 psmouse->private = NULL;
704 kfree(cytp);
705
706 return -1;
707 }
708