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 u8 cytp_rate[] = {10, 20, 40, 60, 100, 200};
36 static const u8 cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
37
cypress_ps2_sendbyte(struct psmouse * psmouse,u8 cmd)38 static int cypress_ps2_sendbyte(struct psmouse *psmouse, u8 cmd)
39 {
40 struct ps2dev *ps2dev = &psmouse->ps2dev;
41 int error;
42
43 error = ps2_sendbyte(ps2dev, cmd, CYTP_CMD_TIMEOUT);
44 if (error) {
45 psmouse_dbg(psmouse,
46 "sending command 0x%02x failed, resp 0x%02x, error %d\n",
47 cmd, ps2dev->nak, error);
48 return error;
49 }
50
51 #ifdef CYTP_DEBUG_VERBOSE
52 psmouse_dbg(psmouse, "sending command 0x%02x succeeded\n", cmd);
53 #endif
54
55 return 0;
56 }
57
cypress_ps2_ext_cmd(struct psmouse * psmouse,u8 prefix,u8 nibble)58 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, u8 prefix, u8 nibble)
59 {
60 struct ps2dev *ps2dev = &psmouse->ps2dev;
61 int tries = CYTP_PS2_CMD_TRIES;
62 int rc;
63
64 ps2_begin_command(ps2dev);
65
66 do {
67 /*
68 * Send extension command byte (0xE8 or 0xF3).
69 * If sending the command fails, send recovery command
70 * to make the device return to the ready state.
71 */
72 rc = cypress_ps2_sendbyte(psmouse, prefix);
73 if (rc == -EAGAIN) {
74 rc = cypress_ps2_sendbyte(psmouse, 0x00);
75 if (rc == -EAGAIN)
76 rc = cypress_ps2_sendbyte(psmouse, 0x0a);
77 }
78
79 if (!rc) {
80 rc = cypress_ps2_sendbyte(psmouse, nibble);
81 if (rc == -EAGAIN)
82 rc = cypress_ps2_sendbyte(psmouse, nibble);
83
84 if (!rc)
85 break;
86 }
87 } while (--tries > 0);
88
89 ps2_end_command(ps2dev);
90
91 return rc;
92 }
93
cypress_verify_cmd_state(struct psmouse * psmouse,u8 cmd,u8 * param)94 static bool cypress_verify_cmd_state(struct psmouse *psmouse, u8 cmd, u8* param)
95 {
96 bool rate_match = false;
97 bool resolution_match = false;
98 int i;
99
100 /* callers will do further checking. */
101 if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
102 cmd == CYTP_CMD_STANDARD_MODE ||
103 cmd == CYTP_CMD_READ_TP_METRICS)
104 return true;
105
106 if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
107 (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
108 for (i = 0; i < sizeof(cytp_resolution); i++)
109 if (cytp_resolution[i] == param[1])
110 resolution_match = true;
111
112 for (i = 0; i < sizeof(cytp_rate); i++)
113 if (cytp_rate[i] == param[2])
114 rate_match = true;
115
116 if (resolution_match && rate_match)
117 return true;
118 }
119
120 psmouse_dbg(psmouse, "verify cmd state failed.\n");
121 return false;
122 }
123
cypress_send_ext_cmd(struct psmouse * psmouse,u8 cmd,u8 * param)124 static int cypress_send_ext_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
125 {
126 u8 cmd_prefix = PSMOUSE_CMD_SETRES & 0xff;
127 unsigned int resp_size = cmd == CYTP_CMD_READ_TP_METRICS ? 8 : 3;
128 unsigned int ps2_cmd = (PSMOUSE_CMD_GETINFO & 0xff) | (resp_size << 8);
129 int tries = CYTP_PS2_CMD_TRIES;
130 int error;
131
132 psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
133 cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
134 DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
135
136 do {
137 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_DD(cmd));
138 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_CC(cmd));
139 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_BB(cmd));
140 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_AA(cmd));
141
142 error = ps2_command(&psmouse->ps2dev, param, ps2_cmd);
143 if (error) {
144 psmouse_dbg(psmouse, "Command 0x%02x failed: %d\n",
145 cmd, error);
146 } else {
147 psmouse_dbg(psmouse,
148 "Command 0x%02x response data (0x): %*ph\n",
149 cmd, resp_size, param);
150
151 if (cypress_verify_cmd_state(psmouse, cmd, param))
152 return 0;
153 }
154 } while (--tries > 0);
155
156 return -EIO;
157 }
158
cypress_detect(struct psmouse * psmouse,bool set_properties)159 int cypress_detect(struct psmouse *psmouse, bool set_properties)
160 {
161 u8 param[3];
162
163 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
164 return -ENODEV;
165
166 /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
167 if (param[0] != 0x33 || param[1] != 0xCC)
168 return -ENODEV;
169
170 if (set_properties) {
171 psmouse->vendor = "Cypress";
172 psmouse->name = "Trackpad";
173 }
174
175 return 0;
176 }
177
cypress_read_fw_version(struct psmouse * psmouse)178 static int cypress_read_fw_version(struct psmouse *psmouse)
179 {
180 struct cytp_data *cytp = psmouse->private;
181 u8 param[3];
182
183 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
184 return -ENODEV;
185
186 /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
187 if (param[0] != 0x33 || param[1] != 0xCC)
188 return -ENODEV;
189
190 cytp->fw_version = param[2] & FW_VERSION_MASX;
191 cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
192
193 /*
194 * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
195 * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
196 */
197 if (cytp->fw_version >= 11)
198 cytp->tp_metrics_supported = 0;
199
200 psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
201 psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
202 cytp->tp_metrics_supported);
203
204 return 0;
205 }
206
cypress_read_tp_metrics(struct psmouse * psmouse)207 static int cypress_read_tp_metrics(struct psmouse *psmouse)
208 {
209 struct cytp_data *cytp = psmouse->private;
210 u8 param[8];
211
212 /* set default values for tp metrics. */
213 cytp->tp_width = CYTP_DEFAULT_WIDTH;
214 cytp->tp_high = CYTP_DEFAULT_HIGH;
215 cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
216 cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
217 cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
218 cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
219 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
220 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
221
222 if (!cytp->tp_metrics_supported)
223 return 0;
224
225 memset(param, 0, sizeof(param));
226 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
227 /* Update trackpad parameters. */
228 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
229 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
230 cytp->tp_min_pressure = param[4];
231 cytp->tp_max_pressure = param[5];
232 }
233
234 if (!cytp->tp_max_pressure ||
235 cytp->tp_max_pressure < cytp->tp_min_pressure ||
236 !cytp->tp_width || !cytp->tp_high ||
237 !cytp->tp_max_abs_x ||
238 cytp->tp_max_abs_x < cytp->tp_width ||
239 !cytp->tp_max_abs_y ||
240 cytp->tp_max_abs_y < cytp->tp_high)
241 return -EINVAL;
242
243 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
244 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
245
246 #ifdef CYTP_DEBUG_VERBOSE
247 psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
248 psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
249 psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
250 psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
251 psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
252 psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
253 psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
254 psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
255 psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
256
257 psmouse_dbg(psmouse, "tp_type_APA = %d\n",
258 (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
259 psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
260 (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
261 psmouse_dbg(psmouse, "tp_palm = %d\n",
262 (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
263 psmouse_dbg(psmouse, "tp_stubborn = %d\n",
264 (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
265 psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
266 (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
267 psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
268 (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
269 psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
270 param[7] & TP_METRICS_BIT_1F_SPIKE);
271 psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
272 (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
273 psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
274 (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
275 #endif
276
277 return 0;
278 }
279
cypress_query_hardware(struct psmouse * psmouse)280 static int cypress_query_hardware(struct psmouse *psmouse)
281 {
282 int error;
283
284 error = cypress_read_fw_version(psmouse);
285 if (error)
286 return error;
287
288 error = cypress_read_tp_metrics(psmouse);
289 if (error)
290 return error;
291
292 return 0;
293 }
294
cypress_set_absolute_mode(struct psmouse * psmouse)295 static int cypress_set_absolute_mode(struct psmouse *psmouse)
296 {
297 struct cytp_data *cytp = psmouse->private;
298 u8 param[3];
299 int error;
300
301 error = cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE,
302 param);
303 if (error)
304 return error;
305
306 cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
307 | CYTP_BIT_ABS_PRESSURE;
308 cypress_set_packet_size(psmouse, 5);
309
310 return 0;
311 }
312
313 /*
314 * Reset trackpad device.
315 * This is also the default mode when trackpad powered on.
316 */
cypress_reset(struct psmouse * psmouse)317 static void cypress_reset(struct psmouse *psmouse)
318 {
319 struct cytp_data *cytp = psmouse->private;
320
321 cytp->mode = 0;
322
323 psmouse_reset(psmouse);
324 }
325
cypress_set_input_params(struct input_dev * input,struct cytp_data * cytp)326 static int cypress_set_input_params(struct input_dev *input,
327 struct cytp_data *cytp)
328 {
329 int error;
330
331 if (!cytp->tp_res_x || !cytp->tp_res_y)
332 return -EINVAL;
333
334 __set_bit(EV_ABS, input->evbit);
335 input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
336 input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
337 input_set_abs_params(input, ABS_PRESSURE,
338 cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
339 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
340
341 /* finger position */
342 input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
343 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
344 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
345
346 error = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
347 INPUT_MT_DROP_UNUSED | INPUT_MT_TRACK);
348 if (error)
349 return error;
350
351 __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
352
353 input_abs_set_res(input, ABS_X, cytp->tp_res_x);
354 input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
355
356 input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
357 input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
358
359 __set_bit(BTN_TOUCH, input->keybit);
360 __set_bit(BTN_TOOL_FINGER, input->keybit);
361 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
362 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
363 __set_bit(BTN_TOOL_QUADTAP, input->keybit);
364 __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
365
366 __clear_bit(EV_REL, input->evbit);
367 __clear_bit(REL_X, input->relbit);
368 __clear_bit(REL_Y, input->relbit);
369
370 __set_bit(EV_KEY, input->evbit);
371 __set_bit(BTN_LEFT, input->keybit);
372 __set_bit(BTN_RIGHT, input->keybit);
373 __set_bit(BTN_MIDDLE, input->keybit);
374
375 return 0;
376 }
377
cypress_get_finger_count(u8 header_byte)378 static int cypress_get_finger_count(u8 header_byte)
379 {
380 u8 bits6_7;
381 int finger_count;
382
383 bits6_7 = header_byte >> 6;
384 finger_count = bits6_7 & 0x03;
385
386 if (finger_count == 1)
387 return 1;
388
389 if (header_byte & ABS_HSCROLL_BIT) {
390 /* HSCROLL gets added on to 0 finger count. */
391 switch (finger_count) {
392 case 0: return 4;
393 case 2: return 5;
394 default:
395 /* Invalid contact (e.g. palm). Ignore it. */
396 return 0;
397 }
398 }
399
400 return finger_count;
401 }
402
403
cypress_parse_packet(struct psmouse * psmouse,struct cytp_data * cytp,struct cytp_report_data * report_data)404 static int cypress_parse_packet(struct psmouse *psmouse,
405 struct cytp_data *cytp,
406 struct cytp_report_data *report_data)
407 {
408 u8 *packet = psmouse->packet;
409 u8 header_byte = packet[0];
410
411 memset(report_data, 0, sizeof(struct cytp_report_data));
412
413 report_data->contact_cnt = cypress_get_finger_count(header_byte);
414 report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
415
416 if (report_data->contact_cnt == 1) {
417 report_data->contacts[0].x =
418 ((packet[1] & 0x70) << 4) | packet[2];
419 report_data->contacts[0].y =
420 ((packet[1] & 0x07) << 8) | packet[3];
421 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
422 report_data->contacts[0].z = packet[4];
423
424 } else if (report_data->contact_cnt >= 2) {
425 report_data->contacts[0].x =
426 ((packet[1] & 0x70) << 4) | packet[2];
427 report_data->contacts[0].y =
428 ((packet[1] & 0x07) << 8) | packet[3];
429 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
430 report_data->contacts[0].z = packet[4];
431
432 report_data->contacts[1].x =
433 ((packet[5] & 0xf0) << 4) | packet[6];
434 report_data->contacts[1].y =
435 ((packet[5] & 0x0f) << 8) | packet[7];
436 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
437 report_data->contacts[1].z = report_data->contacts[0].z;
438 }
439
440 report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
441 report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
442
443 /*
444 * This is only true if one of the mouse buttons were tapped. Make
445 * sure it doesn't turn into a click. The regular tap-to-click
446 * functionality will handle that on its own. If we don't do this,
447 * disabling tap-to-click won't affect the mouse button zones.
448 */
449 if (report_data->tap)
450 report_data->left = 0;
451
452 #ifdef CYTP_DEBUG_VERBOSE
453 {
454 int i;
455 int n = report_data->contact_cnt;
456 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
457 psmouse_dbg(psmouse, "contact_cnt = %d\n",
458 report_data->contact_cnt);
459 if (n > CYTP_MAX_MT_SLOTS)
460 n = CYTP_MAX_MT_SLOTS;
461 for (i = 0; i < n; i++)
462 psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
463 report_data->contacts[i].x,
464 report_data->contacts[i].y,
465 report_data->contacts[i].z);
466 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
467 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
468 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
469 }
470 #endif
471
472 return 0;
473 }
474
cypress_process_packet(struct psmouse * psmouse,bool zero_pkt)475 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
476 {
477 int i;
478 struct input_dev *input = psmouse->dev;
479 struct cytp_data *cytp = psmouse->private;
480 struct cytp_report_data report_data;
481 struct cytp_contact *contact;
482 struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
483 int slots[CYTP_MAX_MT_SLOTS];
484 int n;
485
486 cypress_parse_packet(psmouse, cytp, &report_data);
487
488 n = report_data.contact_cnt;
489 if (n > CYTP_MAX_MT_SLOTS)
490 n = CYTP_MAX_MT_SLOTS;
491
492 for (i = 0; i < n; i++) {
493 contact = &report_data.contacts[i];
494 pos[i].x = contact->x;
495 pos[i].y = contact->y;
496 }
497
498 input_mt_assign_slots(input, slots, pos, n, 0);
499
500 for (i = 0; i < n; i++) {
501 contact = &report_data.contacts[i];
502 input_mt_slot(input, slots[i]);
503 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
504 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
505 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
506 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
507 }
508
509 input_mt_sync_frame(input);
510
511 input_mt_report_finger_count(input, report_data.contact_cnt);
512
513 input_report_key(input, BTN_LEFT, report_data.left);
514 input_report_key(input, BTN_RIGHT, report_data.right);
515 input_report_key(input, BTN_MIDDLE, report_data.middle);
516
517 input_sync(input);
518 }
519
cypress_validate_byte(struct psmouse * psmouse)520 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
521 {
522 int contact_cnt;
523 int index = psmouse->pktcnt - 1;
524 u8 *packet = psmouse->packet;
525 struct cytp_data *cytp = psmouse->private;
526
527 if (index < 0 || index > cytp->pkt_size)
528 return PSMOUSE_BAD_DATA;
529
530 if (index == 0 && (packet[0] & 0xfc) == 0) {
531 /* call packet process for reporting finger leave. */
532 cypress_process_packet(psmouse, 1);
533 return PSMOUSE_FULL_PACKET;
534 }
535
536 /*
537 * Perform validation (and adjust packet size) based only on the
538 * first byte; allow all further bytes through.
539 */
540 if (index != 0)
541 return PSMOUSE_GOOD_DATA;
542
543 /*
544 * If absolute/relative mode bit has not been set yet, just pass
545 * the byte through.
546 */
547 if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
548 return PSMOUSE_GOOD_DATA;
549
550 if ((packet[0] & 0x08) == 0x08)
551 return PSMOUSE_BAD_DATA;
552
553 contact_cnt = cypress_get_finger_count(packet[0]);
554 if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
555 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
556 else
557 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
558
559 return PSMOUSE_GOOD_DATA;
560 }
561
cypress_protocol_handler(struct psmouse * psmouse)562 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
563 {
564 struct cytp_data *cytp = psmouse->private;
565
566 if (psmouse->pktcnt >= cytp->pkt_size) {
567 cypress_process_packet(psmouse, 0);
568 return PSMOUSE_FULL_PACKET;
569 }
570
571 return cypress_validate_byte(psmouse);
572 }
573
cypress_set_rate(struct psmouse * psmouse,unsigned int rate)574 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
575 {
576 struct cytp_data *cytp = psmouse->private;
577 u8 rate_param;
578
579 if (rate >= 80) {
580 psmouse->rate = 80;
581 cytp->mode |= CYTP_BIT_HIGH_RATE;
582 } else {
583 psmouse->rate = 40;
584 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
585 }
586
587 rate_param = (u8)rate;
588 ps2_command(&psmouse->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
589 }
590
cypress_disconnect(struct psmouse * psmouse)591 static void cypress_disconnect(struct psmouse *psmouse)
592 {
593 cypress_reset(psmouse);
594 kfree(psmouse->private);
595 psmouse->private = NULL;
596 }
597
cypress_reconnect(struct psmouse * psmouse)598 static int cypress_reconnect(struct psmouse *psmouse)
599 {
600 int tries = CYTP_PS2_CMD_TRIES;
601 int error;
602
603 do {
604 cypress_reset(psmouse);
605 error = cypress_detect(psmouse, false);
606 } while (error && (--tries > 0));
607
608 if (error) {
609 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
610 return error;
611 }
612
613 error = cypress_set_absolute_mode(psmouse);
614 if (error) {
615 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
616 return error;
617 }
618
619 return 0;
620 }
621
cypress_init(struct psmouse * psmouse)622 int cypress_init(struct psmouse *psmouse)
623 {
624 struct cytp_data *cytp;
625 int error;
626
627 cytp = kzalloc(sizeof(*cytp), GFP_KERNEL);
628 if (!cytp)
629 return -ENOMEM;
630
631 psmouse->private = cytp;
632 psmouse->pktsize = 8;
633
634 cypress_reset(psmouse);
635
636 error = cypress_query_hardware(psmouse);
637 if (error) {
638 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
639 goto err_exit;
640 }
641
642 error = cypress_set_absolute_mode(psmouse);
643 if (error) {
644 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
645 goto err_exit;
646 }
647
648 error = cypress_set_input_params(psmouse->dev, cytp);
649 if (error) {
650 psmouse_err(psmouse, "init: Unable to set input params.\n");
651 goto err_exit;
652 }
653
654 psmouse->model = 1;
655 psmouse->protocol_handler = cypress_protocol_handler;
656 psmouse->set_rate = cypress_set_rate;
657 psmouse->disconnect = cypress_disconnect;
658 psmouse->reconnect = cypress_reconnect;
659 psmouse->cleanup = cypress_reset;
660 psmouse->resync_time = 0;
661
662 return 0;
663
664 err_exit:
665 /*
666 * Reset Cypress Trackpad as a standard mouse. Then
667 * let psmouse driver communicating with it as default PS2 mouse.
668 */
669 cypress_reset(psmouse);
670
671 psmouse->private = NULL;
672 kfree(cytp);
673
674 return error;
675 }
676