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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Parade TrueTouch(TM) Standard Product V5 Module.
4 *
5 * Copyright (C) 2015 Parade Technologies
6 * Copyright (C) 2012-2015 Cypress Semiconductor
7 * Copyright (C) 2018 Bootlin
8 *
9 * Authors: Mylène Josserand <mylene.josserand@bootlin.com>
10 * Alistair Francis <alistair@alistair23.me>
11 */
12
13#include <linux/crc-itu-t.h>
14#include <linux/delay.h>
15#include <linux/device.h>
16#include <linux/gpio/consumer.h>
17#include <linux/input/mt.h>
18#include <linux/input/touchscreen.h>
19#include <linux/interrupt.h>
20#include <linux/i2c.h>
21#include <linux/module.h>
22#include <linux/of_device.h>
23#include <linux/regmap.h>
24#include <asm/unaligned.h>
25
26#define CYTTSP5_NAME "cyttsp5"
27#define CY_I2C_DATA_SIZE (2 * 256)
28#define HID_VERSION 0x0100
29#define CY_MAX_INPUT 512
30#define CYTTSP5_PREALLOCATED_CMD_BUFFER 32
31#define CY_BITS_PER_BTN 1
32#define CY_NUM_BTN_EVENT_ID GENMASK(CY_BITS_PER_BTN, 0)
33
34#define MAX_AREA 255
35#define HID_OUTPUT_BL_SOP 0x1
36#define HID_OUTPUT_BL_EOP 0x17
37#define HID_OUTPUT_BL_LAUNCH_APP 0x3B
38#define HID_OUTPUT_BL_LAUNCH_APP_SIZE 11
39#define HID_OUTPUT_GET_SYSINFO 0x2
40#define HID_OUTPUT_GET_SYSINFO_SIZE 5
41#define HID_OUTPUT_MAX_CMD_SIZE 12
42
43#define HID_DESC_REG 0x1
44#define HID_INPUT_REG 0x3
45#define HID_OUTPUT_REG 0x4
46
47#define REPORT_ID_TOUCH 0x1
48#define REPORT_ID_BTN 0x3
49#define REPORT_SIZE_5 5
50#define REPORT_SIZE_8 8
51#define REPORT_SIZE_16 16
52
53/* Touch reports offsets */
54/* Header offsets */
55#define TOUCH_REPORT_DESC_HDR_CONTACTCOUNT 16
56/* Record offsets */
57#define TOUCH_REPORT_DESC_CONTACTID 8
58#define TOUCH_REPORT_DESC_X 16
59#define TOUCH_REPORT_DESC_Y 32
60#define TOUCH_REPORT_DESC_P 48
61#define TOUCH_REPORT_DESC_MAJ 56
62#define TOUCH_REPORT_DESC_MIN 64
63
64/* HID */
65#define HID_TOUCH_REPORT_ID 0x1
66#define HID_BTN_REPORT_ID 0x3
67#define HID_APP_RESPONSE_REPORT_ID 0x1F
68#define HID_APP_OUTPUT_REPORT_ID 0x2F
69#define HID_BL_RESPONSE_REPORT_ID 0x30
70#define HID_BL_OUTPUT_REPORT_ID 0x40
71
72#define HID_OUTPUT_RESPONSE_REPORT_OFFSET 2
73#define HID_OUTPUT_RESPONSE_CMD_OFFSET 4
74#define HID_OUTPUT_RESPONSE_CMD_MASK GENMASK(6, 0)
75
76#define HID_SYSINFO_SENSING_OFFSET 33
77#define HID_SYSINFO_BTN_OFFSET 48
78#define HID_SYSINFO_BTN_MASK GENMASK(7, 0)
79#define HID_SYSINFO_MAX_BTN 8
80
81#define CY_HID_OUTPUT_TIMEOUT_MS 200
82#define CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS 3000
83#define CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS 4000
84
85/* maximum number of concurrent tracks */
86#define TOUCH_REPORT_SIZE 10
87#define TOUCH_INPUT_HEADER_SIZE 7
88#define BTN_REPORT_SIZE 9
89#define BTN_INPUT_HEADER_SIZE 5
90
91#define MAX_CY_TCH_T_IDS 32
92
93/* All usage pages for Touch Report */
94#define TOUCH_REPORT_USAGE_PG_X 0x00010030
95#define TOUCH_REPORT_USAGE_PG_Y 0x00010031
96#define TOUCH_REPORT_USAGE_PG_P 0x000D0030
97#define TOUCH_REPORT_USAGE_PG_CONTACTID 0x000D0051
98#define TOUCH_REPORT_USAGE_PG_CONTACTCOUNT 0x000D0054
99#define TOUCH_REPORT_USAGE_PG_MAJ 0xFF010062
100#define TOUCH_REPORT_USAGE_PG_MIN 0xFF010063
101#define TOUCH_COL_USAGE_PG 0x000D0022
102
103/* System Information interface definitions */
104struct cyttsp5_sensing_conf_data_dev {
105 u8 electrodes_x;
106 u8 electrodes_y;
107 __le16 len_x;
108 __le16 len_y;
109 __le16 res_x;
110 __le16 res_y;
111 __le16 max_z;
112 u8 origin_x;
113 u8 origin_y;
114 u8 btn;
115 u8 scan_mode;
116 u8 max_num_of_tch_per_refresh_cycle;
117} __packed;
118
119struct cyttsp5_sensing_conf_data {
120 u16 res_x;
121 u16 res_y;
122 u16 max_z;
123 u16 len_x;
124 u16 len_y;
125 u8 origin_x;
126 u8 origin_y;
127 u8 max_tch;
128};
129
130enum cyttsp5_tch_abs { /* for ordering within the extracted touch data array */
131 CY_TCH_X, /* X */
132 CY_TCH_Y, /* Y */
133 CY_TCH_P, /* P (Z) */
134 CY_TCH_T, /* TOUCH ID */
135 CY_TCH_MAJ, /* TOUCH_MAJOR */
136 CY_TCH_MIN, /* TOUCH_MINOR */
137 CY_TCH_NUM_ABS
138};
139
140struct cyttsp5_tch_abs_params {
141 size_t ofs; /* abs byte offset */
142 size_t size; /* size in bits */
143 size_t min; /* min value */
144 size_t max; /* max value */
145 size_t bofs; /* bit offset */
146};
147
148struct cyttsp5_touch {
149 int abs[CY_TCH_NUM_ABS];
150};
151
152struct cyttsp5_sysinfo {
153 struct cyttsp5_sensing_conf_data sensing_conf_data;
154 int num_btns;
155 struct cyttsp5_tch_abs_params tch_hdr;
156 struct cyttsp5_tch_abs_params tch_abs[CY_TCH_NUM_ABS];
157 u32 key_code[HID_SYSINFO_MAX_BTN];
158};
159
160struct cyttsp5_hid_desc {
161 __le16 hid_desc_len;
162 u8 packet_id;
163 u8 reserved_byte;
164 __le16 bcd_version;
165 __le16 report_desc_len;
166 __le16 report_desc_register;
167 __le16 input_register;
168 __le16 max_input_len;
169 __le16 output_register;
170 __le16 max_output_len;
171 __le16 command_register;
172 __le16 data_register;
173 __le16 vendor_id;
174 __le16 product_id;
175 __le16 version_id;
176 u8 reserved[4];
177} __packed;
178
179struct cyttsp5 {
180 struct device *dev;
181 struct completion cmd_done;
182 struct cyttsp5_sysinfo sysinfo;
183 struct cyttsp5_hid_desc hid_desc;
184 u8 cmd_buf[CYTTSP5_PREALLOCATED_CMD_BUFFER];
185 u8 input_buf[CY_MAX_INPUT];
186 u8 response_buf[CY_MAX_INPUT];
187 struct gpio_desc *reset_gpio;
188 struct input_dev *input;
189 char phys[NAME_MAX];
190 int num_prv_rec;
191 struct regmap *regmap;
192 struct touchscreen_properties prop;
193 struct regulator *vdd;
194};
195
196/*
197 * For what is understood in the datasheet, the register does not
198 * matter. For consistency, use the Input Register address
199 * but it does mean anything to the device. The important data
200 * to send is the I2C address
201 */
202static int cyttsp5_read(struct cyttsp5 *ts, u8 *buf, u32 max)
203{
204 int error;
205 u32 size;
206 u8 temp[2];
207
208 /* Read the frame to retrieve the size */
209 error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, temp, sizeof(temp));
210 if (error)
211 return error;
212
213 size = get_unaligned_le16(temp);
214 if (!size || size == 2)
215 return 0;
216
217 if (size > max)
218 return -EINVAL;
219
220 /* Get the real value */
221 return regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, size);
222}
223
224static int cyttsp5_write(struct cyttsp5 *ts, unsigned int reg, u8 *data,
225 size_t size)
226{
227 u8 cmd[HID_OUTPUT_MAX_CMD_SIZE];
228
229 if (size + 1 > HID_OUTPUT_MAX_CMD_SIZE)
230 return -E2BIG;
231
232 /* High bytes of register address needed as first byte of cmd */
233 cmd[0] = (reg >> 8) & 0xFF;
234
235 /* Copy the rest of the data */
236 if (data)
237 memcpy(&cmd[1], data, size);
238
239 /*
240 * The hardware wants to receive a frame with the address register
241 * contained in the first two bytes. As the regmap_write function
242 * add the register adresse in the frame, we use the low byte as
243 * first frame byte for the address register and the first
244 * data byte is the high register + left of the cmd to send
245 */
246 return regmap_bulk_write(ts->regmap, reg & 0xFF, cmd, size + 1);
247}
248
249static void cyttsp5_get_touch_axis(int *axis, int size, int max, u8 *xy_data,
250 int bofs)
251{
252 int nbyte;
253
254 for (nbyte = 0, *axis = 0; nbyte < size; nbyte++)
255 *axis += ((xy_data[nbyte] >> bofs) << (nbyte * 8));
256
257 *axis &= max - 1;
258}
259
260static void cyttsp5_get_touch_record(struct cyttsp5 *ts,
261 struct cyttsp5_touch *touch, u8 *xy_data)
262{
263 struct cyttsp5_sysinfo *si = &ts->sysinfo;
264 enum cyttsp5_tch_abs abs;
265
266 for (abs = CY_TCH_X; abs < CY_TCH_NUM_ABS; abs++)
267 cyttsp5_get_touch_axis(&touch->abs[abs],
268 si->tch_abs[abs].size,
269 si->tch_abs[abs].max,
270 xy_data + si->tch_abs[abs].ofs,
271 si->tch_abs[abs].bofs);
272}
273
274static void cyttsp5_get_mt_touches(struct cyttsp5 *ts,
275 struct cyttsp5_touch *tch, int num_cur_tch)
276{
277 struct cyttsp5_sysinfo *si = &ts->sysinfo;
278 int i, t = 0, offset = 0;
279 DECLARE_BITMAP(ids, MAX_CY_TCH_T_IDS);
280 u8 *tch_addr;
281 int tmp;
282
283 bitmap_zero(ids, MAX_CY_TCH_T_IDS);
284 memset(tch->abs, 0, sizeof(tch->abs));
285
286 switch (ts->input_buf[2]) {
287 case HID_TOUCH_REPORT_ID:
288 offset = TOUCH_INPUT_HEADER_SIZE;
289 break;
290 case HID_BTN_REPORT_ID:
291 offset = BTN_INPUT_HEADER_SIZE;
292 break;
293 }
294
295 for (i = 0; i < num_cur_tch; i++) {
296 tch_addr = ts->input_buf + offset + (i * TOUCH_REPORT_SIZE);
297 cyttsp5_get_touch_record(ts, tch, tch_addr);
298
299 /* Convert MAJOR/MINOR from mm to resolution */
300 tmp = tch->abs[CY_TCH_MAJ] * 100 * si->sensing_conf_data.res_x;
301 tch->abs[CY_TCH_MAJ] = tmp / si->sensing_conf_data.len_x;
302 tmp = tch->abs[CY_TCH_MIN] * 100 * si->sensing_conf_data.res_x;
303 tch->abs[CY_TCH_MIN] = tmp / si->sensing_conf_data.len_x;
304
305 t = tch->abs[CY_TCH_T];
306 input_mt_slot(ts->input, t);
307 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
308 __set_bit(t, ids);
309
310 /* position and pressure fields */
311 touchscreen_report_pos(ts->input, &ts->prop,
312 tch->abs[CY_TCH_X], tch->abs[CY_TCH_Y],
313 true);
314 input_report_abs(ts->input, ABS_MT_PRESSURE,
315 tch->abs[CY_TCH_P]);
316
317 /* Get the extended touch fields */
318 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
319 tch->abs[CY_TCH_MAJ]);
320 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
321 tch->abs[CY_TCH_MIN]);
322 }
323
324 ts->num_prv_rec = num_cur_tch;
325}
326
327static int cyttsp5_mt_attention(struct device *dev)
328{
329 struct cyttsp5 *ts = dev_get_drvdata(dev);
330 struct cyttsp5_sysinfo *si = &ts->sysinfo;
331 int max_tch = si->sensing_conf_data.max_tch;
332 struct cyttsp5_touch tch;
333 int num_cur_tch;
334
335 cyttsp5_get_touch_axis(&num_cur_tch, si->tch_hdr.size,
336 si->tch_hdr.max,
337 ts->input_buf + 3 + si->tch_hdr.ofs,
338 si->tch_hdr.bofs);
339
340 if (num_cur_tch > max_tch) {
341 dev_err(dev, "Num touch err detected (n=%d)\n", num_cur_tch);
342 num_cur_tch = max_tch;
343 }
344
345 if (num_cur_tch == 0 && ts->num_prv_rec == 0)
346 return 0;
347
348 /* extract xy_data for all currently reported touches */
349 if (num_cur_tch)
350 cyttsp5_get_mt_touches(ts, &tch, num_cur_tch);
351
352 input_mt_sync_frame(ts->input);
353 input_sync(ts->input);
354
355 return 0;
356}
357
358static int cyttsp5_setup_input_device(struct device *dev)
359{
360 struct cyttsp5 *ts = dev_get_drvdata(dev);
361 struct cyttsp5_sysinfo *si = &ts->sysinfo;
362 int max_x, max_y, max_p;
363 int max_x_tmp, max_y_tmp;
364 int error;
365
366 max_x_tmp = si->sensing_conf_data.res_x;
367 max_y_tmp = si->sensing_conf_data.res_y;
368 max_x = max_x_tmp - 1;
369 max_y = max_y_tmp - 1;
370 max_p = si->sensing_conf_data.max_z;
371
372 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
373 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
374 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, max_p, 0, 0);
375
376 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
377 input_set_abs_params(ts->input, ABS_MT_TOUCH_MINOR, 0, MAX_AREA, 0, 0);
378
379 error = input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max,
380 INPUT_MT_DROP_UNUSED | INPUT_MT_DIRECT);
381 if (error)
382 return error;
383
384 error = input_register_device(ts->input);
385 if (error) {
386 dev_err(dev, "failed to register input device: %d\n", error);
387 return error;
388 }
389
390 return error;
391}
392
393static int cyttsp5_parse_dt_key_code(struct device *dev)
394{
395 struct cyttsp5 *ts = dev_get_drvdata(dev);
396 struct cyttsp5_sysinfo *si = &ts->sysinfo;
397
398 if (!si->num_btns)
399 return 0;
400
401 /* Initialize the button to RESERVED */
402 memset32(si->key_code, KEY_RESERVED, si->num_btns);
403
404 return device_property_read_u32_array(dev, "linux,keycodes",
405 si->key_code, si->num_btns);
406}
407
408static int cyttsp5_btn_attention(struct device *dev)
409{
410 struct cyttsp5 *ts = dev_get_drvdata(dev);
411 struct cyttsp5_sysinfo *si = &ts->sysinfo;
412 int cur_btn, offset = 0;
413 int cur_btn_state;
414
415 switch (ts->input_buf[2]) {
416 case HID_TOUCH_REPORT_ID:
417 offset = TOUCH_INPUT_HEADER_SIZE;
418 break;
419 case HID_BTN_REPORT_ID:
420 offset = BTN_INPUT_HEADER_SIZE;
421 break;
422 }
423
424 if (ts->input_buf[2] != HID_BTN_REPORT_ID)
425 return 0;
426
427 /* extract button press/release touch information */
428 for (cur_btn = 0; cur_btn < si->num_btns; cur_btn++) {
429 /* Get current button state */
430 cur_btn_state = (ts->input_buf[offset] >> (cur_btn * CY_BITS_PER_BTN))
431 & CY_NUM_BTN_EVENT_ID;
432
433 input_report_key(ts->input, si->key_code[cur_btn],
434 cur_btn_state);
435 input_sync(ts->input);
436 }
437
438 return 0;
439}
440
441static int cyttsp5_validate_cmd_response(struct cyttsp5 *ts, u8 code)
442{
443 u16 size, crc;
444 u8 status, report_id;
445 int command_code;
446
447 size = get_unaligned_le16(&ts->response_buf[0]);
448 if (!size)
449 return 0;
450
451 report_id = ts->response_buf[HID_OUTPUT_RESPONSE_REPORT_OFFSET];
452
453 switch (report_id) {
454 case HID_BL_RESPONSE_REPORT_ID:
455 if (ts->response_buf[4] != HID_OUTPUT_BL_SOP) {
456 dev_err(ts->dev, "HID output response, wrong SOP\n");
457 return -EPROTO;
458 }
459
460 if (ts->response_buf[size - 1] != HID_OUTPUT_BL_EOP) {
461 dev_err(ts->dev, "HID output response, wrong EOP\n");
462 return -EPROTO;
463 }
464
465 crc = crc_itu_t(0xFFFF, &ts->response_buf[4], size - 7);
466 if (get_unaligned_le16(&ts->response_buf[size - 3]) != crc) {
467 dev_err(ts->dev,
468 "HID output response, wrong CRC 0x%X\n",
469 crc);
470 return -EPROTO;
471 }
472
473 status = ts->response_buf[5];
474 if (status) {
475 dev_err(ts->dev, "HID output response, ERROR:%d\n",
476 status);
477 return -EPROTO;
478 }
479 break;
480
481 case HID_APP_RESPONSE_REPORT_ID:
482 command_code = ts->response_buf[HID_OUTPUT_RESPONSE_CMD_OFFSET]
483 & HID_OUTPUT_RESPONSE_CMD_MASK;
484 if (command_code != code) {
485 dev_err(ts->dev,
486 "HID output response, wrong command_code:%X\n",
487 command_code);
488 return -EPROTO;
489 }
490 break;
491 }
492
493 return 0;
494}
495
496static void cyttsp5_si_get_btn_data(struct cyttsp5 *ts)
497{
498 struct cyttsp5_sysinfo *si = &ts->sysinfo;
499 unsigned int btns = ts->response_buf[HID_SYSINFO_BTN_OFFSET] &
500 HID_SYSINFO_BTN_MASK;
501
502 si->num_btns = hweight8(btns);
503}
504
505static int cyttsp5_get_sysinfo_regs(struct cyttsp5 *ts)
506{
507 struct cyttsp5_sensing_conf_data *scd = &ts->sysinfo.sensing_conf_data;
508 struct cyttsp5_sensing_conf_data_dev *scd_dev =
509 (struct cyttsp5_sensing_conf_data_dev *)
510 &ts->response_buf[HID_SYSINFO_SENSING_OFFSET];
511
512 cyttsp5_si_get_btn_data(ts);
513
514 scd->max_tch = scd_dev->max_num_of_tch_per_refresh_cycle;
515 scd->res_x = get_unaligned_le16(&scd_dev->res_x);
516 scd->res_y = get_unaligned_le16(&scd_dev->res_y);
517 scd->max_z = get_unaligned_le16(&scd_dev->max_z);
518 scd->len_x = get_unaligned_le16(&scd_dev->len_x);
519 scd->len_y = get_unaligned_le16(&scd_dev->len_y);
520
521 return 0;
522}
523
524static int cyttsp5_hid_output_get_sysinfo(struct cyttsp5 *ts)
525{
526 int rc;
527 u8 cmd[HID_OUTPUT_GET_SYSINFO_SIZE];
528
529 /* HI bytes of Output register address */
530 put_unaligned_le16(HID_OUTPUT_GET_SYSINFO_SIZE, cmd);
531 cmd[2] = HID_APP_OUTPUT_REPORT_ID;
532 cmd[3] = 0x0; /* Reserved */
533 cmd[4] = HID_OUTPUT_GET_SYSINFO;
534
535 rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
536 HID_OUTPUT_GET_SYSINFO_SIZE);
537 if (rc) {
538 dev_err(ts->dev, "Failed to write command %d", rc);
539 return rc;
540 }
541
542 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
543 msecs_to_jiffies(CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS));
544 if (rc <= 0) {
545 dev_err(ts->dev, "HID output cmd execution timed out\n");
546 rc = -ETIMEDOUT;
547 return rc;
548 }
549
550 rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_GET_SYSINFO);
551 if (rc) {
552 dev_err(ts->dev, "Validation of the response failed\n");
553 return rc;
554 }
555
556 return cyttsp5_get_sysinfo_regs(ts);
557}
558
559static int cyttsp5_hid_output_bl_launch_app(struct cyttsp5 *ts)
560{
561 int rc;
562 u8 cmd[HID_OUTPUT_BL_LAUNCH_APP];
563 u16 crc;
564
565 put_unaligned_le16(HID_OUTPUT_BL_LAUNCH_APP_SIZE, cmd);
566 cmd[2] = HID_BL_OUTPUT_REPORT_ID;
567 cmd[3] = 0x0; /* Reserved */
568 cmd[4] = HID_OUTPUT_BL_SOP;
569 cmd[5] = HID_OUTPUT_BL_LAUNCH_APP;
570 put_unaligned_le16(0x00, &cmd[6]);
571 crc = crc_itu_t(0xFFFF, &cmd[4], 4);
572 put_unaligned_le16(crc, &cmd[8]);
573 cmd[10] = HID_OUTPUT_BL_EOP;
574
575 rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
576 HID_OUTPUT_BL_LAUNCH_APP_SIZE);
577 if (rc) {
578 dev_err(ts->dev, "Failed to write command %d", rc);
579 return rc;
580 }
581
582 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
583 msecs_to_jiffies(CY_HID_OUTPUT_TIMEOUT_MS));
584 if (rc <= 0) {
585 dev_err(ts->dev, "HID output cmd execution timed out\n");
586 rc = -ETIMEDOUT;
587 return rc;
588 }
589
590 rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_BL_LAUNCH_APP);
591 if (rc) {
592 dev_err(ts->dev, "Validation of the response failed\n");
593 return rc;
594 }
595
596 return 0;
597}
598
599static int cyttsp5_get_hid_descriptor(struct cyttsp5 *ts,
600 struct cyttsp5_hid_desc *desc)
601{
602 struct device *dev = ts->dev;
603 __le16 hid_desc_register = cpu_to_le16(HID_DESC_REG);
604 int rc;
605 u8 cmd[2];
606
607 /* Set HID descriptor register */
608 memcpy(cmd, &hid_desc_register, sizeof(hid_desc_register));
609
610 rc = cyttsp5_write(ts, HID_DESC_REG, NULL, 0);
611 if (rc) {
612 dev_err(dev, "Failed to get HID descriptor, rc=%d\n", rc);
613 return rc;
614 }
615
616 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
617 msecs_to_jiffies(CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS));
618 if (rc <= 0) {
619 dev_err(ts->dev, "HID get descriptor timed out\n");
620 rc = -ETIMEDOUT;
621 return rc;
622 }
623
624 memcpy(desc, ts->response_buf, sizeof(*desc));
625
626 /* Check HID descriptor length and version */
627 if (le16_to_cpu(desc->hid_desc_len) != sizeof(*desc) ||
628 le16_to_cpu(desc->bcd_version) != HID_VERSION) {
629 dev_err(dev, "Unsupported HID version\n");
630 return -ENODEV;
631 }
632
633 return 0;
634}
635
636static int fill_tch_abs(struct cyttsp5_tch_abs_params *tch_abs, int report_size,
637 int offset)
638{
639 tch_abs->ofs = offset / 8;
640 tch_abs->size = report_size / 8;
641 if (report_size % 8)
642 tch_abs->size += 1;
643 tch_abs->min = 0;
644 tch_abs->max = 1 << report_size;
645 tch_abs->bofs = offset - (tch_abs->ofs << 3);
646
647 return 0;
648}
649
650static irqreturn_t cyttsp5_handle_irq(int irq, void *handle)
651{
652 struct cyttsp5 *ts = handle;
653 int report_id;
654 int size;
655 int error;
656
657 error = cyttsp5_read(ts, ts->input_buf, CY_MAX_INPUT);
658 if (error)
659 return IRQ_HANDLED;
660
661 size = get_unaligned_le16(&ts->input_buf[0]);
662 if (size == 0) {
663 /* reset */
664 report_id = 0;
665 size = 2;
666 } else {
667 report_id = ts->input_buf[2];
668 }
669
670 switch (report_id) {
671 case HID_TOUCH_REPORT_ID:
672 cyttsp5_mt_attention(ts->dev);
673 break;
674 case HID_BTN_REPORT_ID:
675 cyttsp5_btn_attention(ts->dev);
676 break;
677 default:
678 /* It is not an input but a command response */
679 memcpy(ts->response_buf, ts->input_buf, size);
680 complete(&ts->cmd_done);
681 }
682
683 return IRQ_HANDLED;
684}
685
686static int cyttsp5_deassert_int(struct cyttsp5 *ts)
687{
688 u16 size;
689 u8 buf[2];
690 int error;
691
692 error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, sizeof(buf));
693 if (error < 0)
694 return error;
695
696 size = get_unaligned_le16(&buf[0]);
697 if (size == 2 || size == 0)
698 return 0;
699
700 return -EINVAL;
701}
702
703static int cyttsp5_fill_all_touch(struct cyttsp5 *ts)
704{
705 struct cyttsp5_sysinfo *si = &ts->sysinfo;
706
707 fill_tch_abs(&si->tch_abs[CY_TCH_X], REPORT_SIZE_16,
708 TOUCH_REPORT_DESC_X);
709 fill_tch_abs(&si->tch_abs[CY_TCH_Y], REPORT_SIZE_16,
710 TOUCH_REPORT_DESC_Y);
711 fill_tch_abs(&si->tch_abs[CY_TCH_P], REPORT_SIZE_8,
712 TOUCH_REPORT_DESC_P);
713 fill_tch_abs(&si->tch_abs[CY_TCH_T], REPORT_SIZE_5,
714 TOUCH_REPORT_DESC_CONTACTID);
715 fill_tch_abs(&si->tch_hdr, REPORT_SIZE_5,
716 TOUCH_REPORT_DESC_HDR_CONTACTCOUNT);
717 fill_tch_abs(&si->tch_abs[CY_TCH_MAJ], REPORT_SIZE_8,
718 TOUCH_REPORT_DESC_MAJ);
719 fill_tch_abs(&si->tch_abs[CY_TCH_MIN], REPORT_SIZE_8,
720 TOUCH_REPORT_DESC_MIN);
721
722 return 0;
723}
724
725static int cyttsp5_startup(struct cyttsp5 *ts)
726{
727 int error;
728
729 error = cyttsp5_deassert_int(ts);
730 if (error) {
731 dev_err(ts->dev, "Error on deassert int r=%d\n", error);
732 return -ENODEV;
733 }
734
735 /*
736 * Launch the application as the device starts in bootloader mode
737 * because of a power-on-reset
738 */
739 error = cyttsp5_hid_output_bl_launch_app(ts);
740 if (error < 0) {
741 dev_err(ts->dev, "Error on launch app r=%d\n", error);
742 return error;
743 }
744
745 error = cyttsp5_get_hid_descriptor(ts, &ts->hid_desc);
746 if (error < 0) {
747 dev_err(ts->dev, "Error on getting HID descriptor r=%d\n", error);
748 return error;
749 }
750
751 error = cyttsp5_fill_all_touch(ts);
752 if (error < 0) {
753 dev_err(ts->dev, "Error on report descriptor r=%d\n", error);
754 return error;
755 }
756
757 error = cyttsp5_hid_output_get_sysinfo(ts);
758 if (error) {
759 dev_err(ts->dev, "Error on getting sysinfo r=%d\n", error);
760 return error;
761 }
762
763 return error;
764}
765
766static void cyttsp5_cleanup(void *data)
767{
768 struct cyttsp5 *ts = data;
769
770 regulator_disable(ts->vdd);
771}
772
773static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
774 const char *name)
775{
776 struct cyttsp5 *ts;
777 struct cyttsp5_sysinfo *si;
778 int error, i;
779
780 ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
781 if (!ts)
782 return -ENOMEM;
783
784 /* Initialize device info */
785 ts->regmap = regmap;
786 ts->dev = dev;
787 si = &ts->sysinfo;
788 dev_set_drvdata(dev, ts);
789
790 init_completion(&ts->cmd_done);
791
792 /* Power up the device */
793 ts->vdd = devm_regulator_get(dev, "vdd");
794 if (IS_ERR(ts->vdd)) {
795 error = PTR_ERR(ts->vdd);
796 return error;
797 }
798
799 error = devm_add_action_or_reset(dev, cyttsp5_cleanup, ts);
800 if (error)
801 return error;
802
803 error = regulator_enable(ts->vdd);
804 if (error)
805 return error;
806
807 ts->input = devm_input_allocate_device(dev);
808 if (!ts->input) {
809 dev_err(dev, "Error, failed to allocate input device\n");
810 return -ENODEV;
811 }
812
813 ts->input->name = "cyttsp5";
814 scnprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
815 ts->input->phys = ts->phys;
816 input_set_drvdata(ts->input, ts);
817
818 /* Reset the gpio to be in a reset state */
819 ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
820 if (IS_ERR(ts->reset_gpio)) {
821 error = PTR_ERR(ts->reset_gpio);
822 dev_err(dev, "Failed to request reset gpio, error %d\n", error);
823 return error;
824 }
825 gpiod_set_value_cansleep(ts->reset_gpio, 0);
826
827 /* Need a delay to have device up */
828 msleep(20);
829
830 error = devm_request_threaded_irq(dev, irq, NULL, cyttsp5_handle_irq,
831 IRQF_ONESHOT, name, ts);
832 if (error) {
833 dev_err(dev, "unable to request IRQ\n");
834 return error;
835 }
836
837 error = cyttsp5_startup(ts);
838 if (error) {
839 dev_err(ts->dev, "Fail initial startup r=%d\n", error);
840 return error;
841 }
842
843 error = cyttsp5_parse_dt_key_code(dev);
844 if (error < 0) {
845 dev_err(ts->dev, "Error while parsing dts %d\n", error);
846 return error;
847 }
848
849 touchscreen_parse_properties(ts->input, true, &ts->prop);
850
851 __set_bit(EV_KEY, ts->input->evbit);
852 for (i = 0; i < si->num_btns; i++)
853 __set_bit(si->key_code[i], ts->input->keybit);
854
855 return cyttsp5_setup_input_device(dev);
856}
857
858static int cyttsp5_i2c_probe(struct i2c_client *client)
859{
860 struct regmap *regmap;
861 static const struct regmap_config config = {
862 .reg_bits = 8,
863 .val_bits = 8,
864 };
865
866 regmap = devm_regmap_init_i2c(client, &config);
867 if (IS_ERR(regmap)) {
868 dev_err(&client->dev, "regmap allocation failed: %ld\n",
869 PTR_ERR(regmap));
870 return PTR_ERR(regmap);
871 }
872
873 return cyttsp5_probe(&client->dev, regmap, client->irq, client->name);
874}
875
876static const struct of_device_id cyttsp5_of_match[] = {
877 { .compatible = "cypress,tt21000", },
878 { }
879};
880MODULE_DEVICE_TABLE(of, cyttsp5_of_match);
881
882static const struct i2c_device_id cyttsp5_i2c_id[] = {
883 { CYTTSP5_NAME, 0, },
884 { }
885};
886MODULE_DEVICE_TABLE(i2c, cyttsp5_i2c_id);
887
888static struct i2c_driver cyttsp5_i2c_driver = {
889 .driver = {
890 .name = CYTTSP5_NAME,
891 .of_match_table = cyttsp5_of_match,
892 },
893 .probe_new = cyttsp5_i2c_probe,
894 .id_table = cyttsp5_i2c_id,
895};
896module_i2c_driver(cyttsp5_i2c_driver);
897
898MODULE_LICENSE("GPL");
899MODULE_DESCRIPTION("Touchscreen driver for Cypress TrueTouch Gen 5 Product");
900MODULE_AUTHOR("Mylène Josserand <mylene.josserand@bootlin.com>");