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/mod_devicetable.h>
22 #include <linux/module.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 - 1, 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 #define HID_COMMAND_REG 0x5
47
48 #define REPORT_ID_TOUCH 0x1
49 #define REPORT_ID_BTN 0x3
50 #define REPORT_SIZE_5 5
51 #define REPORT_SIZE_8 8
52 #define REPORT_SIZE_16 16
53
54 /* Touch reports offsets */
55 /* Header offsets */
56 #define TOUCH_REPORT_DESC_HDR_CONTACTCOUNT 16
57 /* Record offsets */
58 #define TOUCH_REPORT_DESC_CONTACTID 8
59 #define TOUCH_REPORT_DESC_X 16
60 #define TOUCH_REPORT_DESC_Y 32
61 #define TOUCH_REPORT_DESC_P 48
62 #define TOUCH_REPORT_DESC_MAJ 56
63 #define TOUCH_REPORT_DESC_MIN 64
64
65 /* HID */
66 #define HID_TOUCH_REPORT_ID 0x1
67 #define HID_BTN_REPORT_ID 0x3
68 #define HID_APP_RESPONSE_REPORT_ID 0x1F
69 #define HID_APP_OUTPUT_REPORT_ID 0x2F
70 #define HID_BL_RESPONSE_REPORT_ID 0x30
71 #define HID_BL_OUTPUT_REPORT_ID 0x40
72 #define HID_RESPONSE_REPORT_ID 0xF0
73
74 #define HID_OUTPUT_RESPONSE_REPORT_OFFSET 2
75 #define HID_OUTPUT_RESPONSE_CMD_OFFSET 4
76 #define HID_OUTPUT_RESPONSE_CMD_MASK GENMASK(6, 0)
77
78 #define HID_SYSINFO_SENSING_OFFSET 33
79 #define HID_SYSINFO_BTN_OFFSET 48
80 #define HID_SYSINFO_BTN_MASK GENMASK(7, 0)
81 #define HID_SYSINFO_MAX_BTN 8
82
83 #define HID_CMD_SET_POWER 0x8
84
85 #define HID_POWER_ON 0x0
86 #define HID_POWER_SLEEP 0x1
87
88 #define CY_HID_OUTPUT_TIMEOUT_MS 200
89 #define CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS 3000
90 #define CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS 4000
91 #define CY_HID_SET_POWER_TIMEOUT 500
92
93 /* maximum number of concurrent tracks */
94 #define TOUCH_REPORT_SIZE 10
95 #define TOUCH_INPUT_HEADER_SIZE 7
96 #define BTN_REPORT_SIZE 9
97 #define BTN_INPUT_HEADER_SIZE 5
98
99 #define MAX_CY_TCH_T_IDS 32
100
101 /* All usage pages for Touch Report */
102 #define TOUCH_REPORT_USAGE_PG_X 0x00010030
103 #define TOUCH_REPORT_USAGE_PG_Y 0x00010031
104 #define TOUCH_REPORT_USAGE_PG_P 0x000D0030
105 #define TOUCH_REPORT_USAGE_PG_CONTACTID 0x000D0051
106 #define TOUCH_REPORT_USAGE_PG_CONTACTCOUNT 0x000D0054
107 #define TOUCH_REPORT_USAGE_PG_MAJ 0xFF010062
108 #define TOUCH_REPORT_USAGE_PG_MIN 0xFF010063
109 #define TOUCH_COL_USAGE_PG 0x000D0022
110
111 #define SET_CMD_LOW(byte, bits) \
112 ((byte) = (((byte) & 0xF0) | ((bits) & 0x0F)))
113 #define SET_CMD_HIGH(byte, bits)\
114 ((byte) = (((byte) & 0x0F) | ((bits) & 0xF0)))
115 #define SET_CMD_OPCODE(byte, opcode) SET_CMD_LOW(byte, opcode)
116 #define SET_CMD_REPORT_TYPE(byte, type) SET_CMD_HIGH(byte, ((type) << 4))
117 #define SET_CMD_REPORT_ID(byte, id) SET_CMD_LOW(byte, id)
118
119 /* System Information interface definitions */
120 struct cyttsp5_sensing_conf_data_dev {
121 u8 electrodes_x;
122 u8 electrodes_y;
123 __le16 len_x;
124 __le16 len_y;
125 __le16 res_x;
126 __le16 res_y;
127 __le16 max_z;
128 u8 origin_x;
129 u8 origin_y;
130 u8 panel_id;
131 u8 btn;
132 u8 scan_mode;
133 u8 max_num_of_tch_per_refresh_cycle;
134 } __packed;
135
136 struct cyttsp5_sensing_conf_data {
137 u16 res_x;
138 u16 res_y;
139 u16 max_z;
140 u16 len_x;
141 u16 len_y;
142 u8 origin_x;
143 u8 origin_y;
144 u8 max_tch;
145 };
146
147 enum cyttsp5_tch_abs { /* for ordering within the extracted touch data array */
148 CY_TCH_X, /* X */
149 CY_TCH_Y, /* Y */
150 CY_TCH_P, /* P (Z) */
151 CY_TCH_T, /* TOUCH ID */
152 CY_TCH_MAJ, /* TOUCH_MAJOR */
153 CY_TCH_MIN, /* TOUCH_MINOR */
154 CY_TCH_NUM_ABS
155 };
156
157 struct cyttsp5_tch_abs_params {
158 size_t ofs; /* abs byte offset */
159 size_t size; /* size in bits */
160 size_t min; /* min value */
161 size_t max; /* max value */
162 size_t bofs; /* bit offset */
163 };
164
165 struct cyttsp5_touch {
166 int abs[CY_TCH_NUM_ABS];
167 };
168
169 struct cyttsp5_sysinfo {
170 struct cyttsp5_sensing_conf_data sensing_conf_data;
171 int num_btns;
172 struct cyttsp5_tch_abs_params tch_hdr;
173 struct cyttsp5_tch_abs_params tch_abs[CY_TCH_NUM_ABS];
174 u32 key_code[HID_SYSINFO_MAX_BTN];
175 };
176
177 struct cyttsp5_hid_desc {
178 __le16 hid_desc_len;
179 u8 packet_id;
180 u8 reserved_byte;
181 __le16 bcd_version;
182 __le16 report_desc_len;
183 __le16 report_desc_register;
184 __le16 input_register;
185 __le16 max_input_len;
186 __le16 output_register;
187 __le16 max_output_len;
188 __le16 command_register;
189 __le16 data_register;
190 __le16 vendor_id;
191 __le16 product_id;
192 __le16 version_id;
193 u8 reserved[4];
194 } __packed;
195
196 struct cyttsp5 {
197 struct device *dev;
198 struct completion cmd_done;
199 struct cyttsp5_sysinfo sysinfo;
200 struct cyttsp5_hid_desc hid_desc;
201 u8 cmd_buf[CYTTSP5_PREALLOCATED_CMD_BUFFER];
202 u8 input_buf[CY_MAX_INPUT];
203 u8 response_buf[CY_MAX_INPUT];
204 struct gpio_desc *reset_gpio;
205 struct input_dev *input;
206 char phys[NAME_MAX];
207 int num_prv_rec;
208 struct regmap *regmap;
209 struct touchscreen_properties prop;
210 struct regulator *vdd;
211 };
212
213 /*
214 * For what is understood in the datasheet, the register does not
215 * matter. For consistency, use the Input Register address
216 * but it does mean anything to the device. The important data
217 * to send is the I2C address
218 */
cyttsp5_read(struct cyttsp5 * ts,u8 * buf,u32 max)219 static int cyttsp5_read(struct cyttsp5 *ts, u8 *buf, u32 max)
220 {
221 int error;
222 u32 size;
223 u8 temp[2];
224
225 /* Read the frame to retrieve the size */
226 error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, temp, sizeof(temp));
227 if (error)
228 return error;
229
230 size = get_unaligned_le16(temp);
231 if (!size || size == 2)
232 return 0;
233
234 if (size > max)
235 return -EINVAL;
236
237 /* Get the real value */
238 return regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, size);
239 }
240
cyttsp5_write(struct cyttsp5 * ts,unsigned int reg,u8 * data,size_t size)241 static int cyttsp5_write(struct cyttsp5 *ts, unsigned int reg, u8 *data,
242 size_t size)
243 {
244 u8 cmd[HID_OUTPUT_MAX_CMD_SIZE];
245
246 if (size + 1 > HID_OUTPUT_MAX_CMD_SIZE)
247 return -E2BIG;
248
249 /* High bytes of register address needed as first byte of cmd */
250 cmd[0] = (reg >> 8) & 0xFF;
251
252 /* Copy the rest of the data */
253 if (data)
254 memcpy(&cmd[1], data, size);
255
256 /*
257 * The hardware wants to receive a frame with the address register
258 * contained in the first two bytes. As the regmap_write function
259 * add the register adresse in the frame, we use the low byte as
260 * first frame byte for the address register and the first
261 * data byte is the high register + left of the cmd to send
262 */
263 return regmap_bulk_write(ts->regmap, reg & 0xFF, cmd, size + 1);
264 }
265
cyttsp5_get_touch_axis(int * axis,int size,int max,u8 * xy_data,int bofs)266 static void cyttsp5_get_touch_axis(int *axis, int size, int max, u8 *xy_data,
267 int bofs)
268 {
269 int nbyte;
270
271 for (nbyte = 0, *axis = 0; nbyte < size; nbyte++)
272 *axis += ((xy_data[nbyte] >> bofs) << (nbyte * 8));
273
274 *axis &= max - 1;
275 }
276
cyttsp5_get_touch_record(struct cyttsp5 * ts,struct cyttsp5_touch * touch,u8 * xy_data)277 static void cyttsp5_get_touch_record(struct cyttsp5 *ts,
278 struct cyttsp5_touch *touch, u8 *xy_data)
279 {
280 struct cyttsp5_sysinfo *si = &ts->sysinfo;
281 enum cyttsp5_tch_abs abs;
282
283 for (abs = CY_TCH_X; abs < CY_TCH_NUM_ABS; abs++)
284 cyttsp5_get_touch_axis(&touch->abs[abs],
285 si->tch_abs[abs].size,
286 si->tch_abs[abs].max,
287 xy_data + si->tch_abs[abs].ofs,
288 si->tch_abs[abs].bofs);
289 }
290
cyttsp5_get_mt_touches(struct cyttsp5 * ts,struct cyttsp5_touch * tch,int num_cur_tch)291 static void cyttsp5_get_mt_touches(struct cyttsp5 *ts,
292 struct cyttsp5_touch *tch, int num_cur_tch)
293 {
294 struct cyttsp5_sysinfo *si = &ts->sysinfo;
295 int i, t = 0, offset = 0;
296 DECLARE_BITMAP(ids, MAX_CY_TCH_T_IDS);
297 u8 *tch_addr;
298 int tmp;
299
300 bitmap_zero(ids, MAX_CY_TCH_T_IDS);
301 memset(tch->abs, 0, sizeof(tch->abs));
302
303 switch (ts->input_buf[2]) {
304 case HID_TOUCH_REPORT_ID:
305 offset = TOUCH_INPUT_HEADER_SIZE;
306 break;
307 case HID_BTN_REPORT_ID:
308 offset = BTN_INPUT_HEADER_SIZE;
309 break;
310 }
311
312 for (i = 0; i < num_cur_tch; i++) {
313 tch_addr = ts->input_buf + offset + (i * TOUCH_REPORT_SIZE);
314 cyttsp5_get_touch_record(ts, tch, tch_addr);
315
316 /* Convert MAJOR/MINOR from mm to resolution */
317 tmp = tch->abs[CY_TCH_MAJ] * 100 * si->sensing_conf_data.res_x;
318 tch->abs[CY_TCH_MAJ] = tmp / si->sensing_conf_data.len_x;
319 tmp = tch->abs[CY_TCH_MIN] * 100 * si->sensing_conf_data.res_x;
320 tch->abs[CY_TCH_MIN] = tmp / si->sensing_conf_data.len_x;
321
322 t = tch->abs[CY_TCH_T];
323 input_mt_slot(ts->input, t);
324 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
325 __set_bit(t, ids);
326
327 /* position and pressure fields */
328 touchscreen_report_pos(ts->input, &ts->prop,
329 tch->abs[CY_TCH_X], tch->abs[CY_TCH_Y],
330 true);
331 input_report_abs(ts->input, ABS_MT_PRESSURE,
332 tch->abs[CY_TCH_P]);
333
334 /* Get the extended touch fields */
335 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
336 tch->abs[CY_TCH_MAJ]);
337 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
338 tch->abs[CY_TCH_MIN]);
339 }
340
341 ts->num_prv_rec = num_cur_tch;
342 }
343
cyttsp5_mt_attention(struct device * dev)344 static int cyttsp5_mt_attention(struct device *dev)
345 {
346 struct cyttsp5 *ts = dev_get_drvdata(dev);
347 struct cyttsp5_sysinfo *si = &ts->sysinfo;
348 int max_tch = si->sensing_conf_data.max_tch;
349 struct cyttsp5_touch tch;
350 int num_cur_tch;
351
352 cyttsp5_get_touch_axis(&num_cur_tch, si->tch_hdr.size,
353 si->tch_hdr.max,
354 ts->input_buf + 3 + si->tch_hdr.ofs,
355 si->tch_hdr.bofs);
356
357 if (num_cur_tch > max_tch) {
358 dev_err(dev, "Num touch err detected (n=%d)\n", num_cur_tch);
359 num_cur_tch = max_tch;
360 }
361
362 if (num_cur_tch == 0 && ts->num_prv_rec == 0)
363 return 0;
364
365 /* extract xy_data for all currently reported touches */
366 if (num_cur_tch)
367 cyttsp5_get_mt_touches(ts, &tch, num_cur_tch);
368
369 input_mt_sync_frame(ts->input);
370 input_sync(ts->input);
371
372 return 0;
373 }
374
cyttsp5_setup_input_device(struct device * dev)375 static int cyttsp5_setup_input_device(struct device *dev)
376 {
377 struct cyttsp5 *ts = dev_get_drvdata(dev);
378 struct cyttsp5_sysinfo *si = &ts->sysinfo;
379 int max_x, max_y, max_p;
380 int max_x_tmp, max_y_tmp;
381 int error;
382
383 max_x_tmp = si->sensing_conf_data.res_x;
384 max_y_tmp = si->sensing_conf_data.res_y;
385 max_x = max_x_tmp - 1;
386 max_y = max_y_tmp - 1;
387 max_p = si->sensing_conf_data.max_z;
388
389 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
390 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
391 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, max_p, 0, 0);
392
393 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
394 input_set_abs_params(ts->input, ABS_MT_TOUCH_MINOR, 0, MAX_AREA, 0, 0);
395
396 error = input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max,
397 INPUT_MT_DROP_UNUSED | INPUT_MT_DIRECT);
398 if (error)
399 return error;
400
401 error = input_register_device(ts->input);
402 if (error) {
403 dev_err(dev, "failed to register input device: %d\n", error);
404 return error;
405 }
406
407 return error;
408 }
409
cyttsp5_parse_dt_key_code(struct device * dev)410 static int cyttsp5_parse_dt_key_code(struct device *dev)
411 {
412 struct cyttsp5 *ts = dev_get_drvdata(dev);
413 struct cyttsp5_sysinfo *si = &ts->sysinfo;
414
415 if (!si->num_btns)
416 return 0;
417
418 /* Initialize the button to RESERVED */
419 memset32(si->key_code, KEY_RESERVED, si->num_btns);
420
421 return device_property_read_u32_array(dev, "linux,keycodes",
422 si->key_code, si->num_btns);
423 }
424
cyttsp5_btn_attention(struct device * dev)425 static int cyttsp5_btn_attention(struct device *dev)
426 {
427 struct cyttsp5 *ts = dev_get_drvdata(dev);
428 struct cyttsp5_sysinfo *si = &ts->sysinfo;
429 int cur_btn, offset = 0;
430 int cur_btn_state;
431
432 switch (ts->input_buf[2]) {
433 case HID_TOUCH_REPORT_ID:
434 offset = TOUCH_INPUT_HEADER_SIZE;
435 break;
436 case HID_BTN_REPORT_ID:
437 offset = BTN_INPUT_HEADER_SIZE;
438 break;
439 }
440
441 if (ts->input_buf[2] != HID_BTN_REPORT_ID)
442 return 0;
443
444 /* extract button press/release touch information */
445 for (cur_btn = 0; cur_btn < si->num_btns; cur_btn++) {
446 /* Get current button state */
447 cur_btn_state = (ts->input_buf[offset] >> (cur_btn * CY_BITS_PER_BTN))
448 & CY_NUM_BTN_EVENT_ID;
449
450 input_report_key(ts->input, si->key_code[cur_btn],
451 cur_btn_state);
452 input_sync(ts->input);
453 }
454
455 return 0;
456 }
457
cyttsp5_validate_cmd_response(struct cyttsp5 * ts,u8 code)458 static int cyttsp5_validate_cmd_response(struct cyttsp5 *ts, u8 code)
459 {
460 u16 size, crc;
461 u8 status, report_id;
462 int command_code;
463
464 size = get_unaligned_le16(&ts->response_buf[0]);
465 if (!size)
466 return 0;
467
468 report_id = ts->response_buf[HID_OUTPUT_RESPONSE_REPORT_OFFSET];
469
470 switch (report_id) {
471 case HID_BL_RESPONSE_REPORT_ID:
472 if (ts->response_buf[4] != HID_OUTPUT_BL_SOP) {
473 dev_err(ts->dev, "HID output response, wrong SOP\n");
474 return -EPROTO;
475 }
476
477 if (ts->response_buf[size - 1] != HID_OUTPUT_BL_EOP) {
478 dev_err(ts->dev, "HID output response, wrong EOP\n");
479 return -EPROTO;
480 }
481
482 crc = crc_itu_t(0xFFFF, &ts->response_buf[4], size - 7);
483 if (get_unaligned_le16(&ts->response_buf[size - 3]) != crc) {
484 dev_err(ts->dev,
485 "HID output response, wrong CRC 0x%X\n",
486 crc);
487 return -EPROTO;
488 }
489
490 status = ts->response_buf[5];
491 if (status) {
492 dev_err(ts->dev, "HID output response, ERROR:%d\n",
493 status);
494 return -EPROTO;
495 }
496 break;
497
498 case HID_APP_RESPONSE_REPORT_ID:
499 command_code = ts->response_buf[HID_OUTPUT_RESPONSE_CMD_OFFSET]
500 & HID_OUTPUT_RESPONSE_CMD_MASK;
501 if (command_code != code) {
502 dev_err(ts->dev,
503 "HID output response, wrong command_code:%X\n",
504 command_code);
505 return -EPROTO;
506 }
507 break;
508 }
509
510 return 0;
511 }
512
cyttsp5_si_get_btn_data(struct cyttsp5 * ts)513 static void cyttsp5_si_get_btn_data(struct cyttsp5 *ts)
514 {
515 struct cyttsp5_sysinfo *si = &ts->sysinfo;
516 unsigned int btns = ts->response_buf[HID_SYSINFO_BTN_OFFSET] &
517 HID_SYSINFO_BTN_MASK;
518
519 si->num_btns = hweight8(btns);
520 }
521
cyttsp5_get_sysinfo_regs(struct cyttsp5 * ts)522 static int cyttsp5_get_sysinfo_regs(struct cyttsp5 *ts)
523 {
524 struct cyttsp5_sensing_conf_data *scd = &ts->sysinfo.sensing_conf_data;
525 struct cyttsp5_sensing_conf_data_dev *scd_dev =
526 (struct cyttsp5_sensing_conf_data_dev *)
527 &ts->response_buf[HID_SYSINFO_SENSING_OFFSET];
528
529 cyttsp5_si_get_btn_data(ts);
530
531 scd->max_tch = scd_dev->max_num_of_tch_per_refresh_cycle;
532 scd->res_x = get_unaligned_le16(&scd_dev->res_x);
533 scd->res_y = get_unaligned_le16(&scd_dev->res_y);
534 scd->max_z = get_unaligned_le16(&scd_dev->max_z);
535 scd->len_x = get_unaligned_le16(&scd_dev->len_x);
536 scd->len_y = get_unaligned_le16(&scd_dev->len_y);
537
538 return 0;
539 }
540
cyttsp5_hid_output_get_sysinfo(struct cyttsp5 * ts)541 static int cyttsp5_hid_output_get_sysinfo(struct cyttsp5 *ts)
542 {
543 int rc;
544 u8 cmd[HID_OUTPUT_GET_SYSINFO_SIZE];
545
546 /* HI bytes of Output register address */
547 put_unaligned_le16(HID_OUTPUT_GET_SYSINFO_SIZE, cmd);
548 cmd[2] = HID_APP_OUTPUT_REPORT_ID;
549 cmd[3] = 0x0; /* Reserved */
550 cmd[4] = HID_OUTPUT_GET_SYSINFO;
551
552 rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
553 HID_OUTPUT_GET_SYSINFO_SIZE);
554 if (rc) {
555 dev_err(ts->dev, "Failed to write command %d", rc);
556 return rc;
557 }
558
559 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
560 msecs_to_jiffies(CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS));
561 if (rc <= 0) {
562 dev_err(ts->dev, "HID output cmd execution timed out\n");
563 rc = -ETIMEDOUT;
564 return rc;
565 }
566
567 rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_GET_SYSINFO);
568 if (rc) {
569 dev_err(ts->dev, "Validation of the response failed\n");
570 return rc;
571 }
572
573 return cyttsp5_get_sysinfo_regs(ts);
574 }
575
cyttsp5_power_control(struct cyttsp5 * ts,bool on)576 static int cyttsp5_power_control(struct cyttsp5 *ts, bool on)
577 {
578 u8 state = on ? HID_POWER_ON : HID_POWER_SLEEP;
579 u8 cmd[2] = { 0 };
580 int rc;
581
582 SET_CMD_REPORT_TYPE(cmd[0], 0);
583 SET_CMD_REPORT_ID(cmd[0], HID_POWER_SLEEP);
584 SET_CMD_OPCODE(cmd[1], HID_CMD_SET_POWER);
585
586 rc = cyttsp5_write(ts, HID_COMMAND_REG, cmd, sizeof(cmd));
587 if (rc) {
588 dev_err(ts->dev, "Failed to write power command %d", rc);
589 return rc;
590 }
591
592 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
593 msecs_to_jiffies(CY_HID_SET_POWER_TIMEOUT));
594 if (rc <= 0) {
595 dev_err(ts->dev, "HID power cmd execution timed out\n");
596 return -ETIMEDOUT;
597 }
598
599 if (ts->response_buf[2] != HID_RESPONSE_REPORT_ID ||
600 (ts->response_buf[3] & 0x03) != state ||
601 (ts->response_buf[4] & 0x0f) != HID_CMD_SET_POWER) {
602 dev_err(ts->dev, "Validation of the %s response failed\n",
603 on ? "wakeup" : "sleep");
604 return -EINVAL;
605 }
606
607 return 0;
608 }
609
cyttsp5_hid_output_bl_launch_app(struct cyttsp5 * ts)610 static int cyttsp5_hid_output_bl_launch_app(struct cyttsp5 *ts)
611 {
612 int rc;
613 u8 cmd[HID_OUTPUT_BL_LAUNCH_APP_SIZE];
614 u16 crc;
615
616 put_unaligned_le16(HID_OUTPUT_BL_LAUNCH_APP_SIZE, cmd);
617 cmd[2] = HID_BL_OUTPUT_REPORT_ID;
618 cmd[3] = 0x0; /* Reserved */
619 cmd[4] = HID_OUTPUT_BL_SOP;
620 cmd[5] = HID_OUTPUT_BL_LAUNCH_APP;
621 put_unaligned_le16(0x00, &cmd[6]);
622 crc = crc_itu_t(0xFFFF, &cmd[4], 4);
623 put_unaligned_le16(crc, &cmd[8]);
624 cmd[10] = HID_OUTPUT_BL_EOP;
625
626 rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
627 HID_OUTPUT_BL_LAUNCH_APP_SIZE);
628 if (rc) {
629 dev_err(ts->dev, "Failed to write command %d", rc);
630 return rc;
631 }
632
633 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
634 msecs_to_jiffies(CY_HID_OUTPUT_TIMEOUT_MS));
635 if (rc <= 0) {
636 dev_err(ts->dev, "HID output cmd execution timed out\n");
637 rc = -ETIMEDOUT;
638 return rc;
639 }
640
641 rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_BL_LAUNCH_APP);
642 if (rc) {
643 dev_err(ts->dev, "Validation of the response failed\n");
644 return rc;
645 }
646
647 return 0;
648 }
649
cyttsp5_get_hid_descriptor(struct cyttsp5 * ts,struct cyttsp5_hid_desc * desc)650 static int cyttsp5_get_hid_descriptor(struct cyttsp5 *ts,
651 struct cyttsp5_hid_desc *desc)
652 {
653 struct device *dev = ts->dev;
654 int rc;
655
656 rc = cyttsp5_write(ts, HID_DESC_REG, NULL, 0);
657 if (rc) {
658 dev_err(dev, "Failed to get HID descriptor, rc=%d\n", rc);
659 return rc;
660 }
661
662 rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
663 msecs_to_jiffies(CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS));
664 if (rc <= 0) {
665 dev_err(ts->dev, "HID get descriptor timed out\n");
666 rc = -ETIMEDOUT;
667 return rc;
668 }
669
670 memcpy(desc, ts->response_buf, sizeof(*desc));
671
672 /* Check HID descriptor length and version */
673 if (le16_to_cpu(desc->hid_desc_len) != sizeof(*desc) ||
674 le16_to_cpu(desc->bcd_version) != HID_VERSION) {
675 dev_err(dev, "Unsupported HID version\n");
676 return -ENODEV;
677 }
678
679 return 0;
680 }
681
fill_tch_abs(struct cyttsp5_tch_abs_params * tch_abs,int report_size,int offset)682 static int fill_tch_abs(struct cyttsp5_tch_abs_params *tch_abs, int report_size,
683 int offset)
684 {
685 tch_abs->ofs = offset / 8;
686 tch_abs->size = report_size / 8;
687 if (report_size % 8)
688 tch_abs->size += 1;
689 tch_abs->min = 0;
690 tch_abs->max = 1 << report_size;
691 tch_abs->bofs = offset - (tch_abs->ofs << 3);
692
693 return 0;
694 }
695
cyttsp5_handle_irq(int irq,void * handle)696 static irqreturn_t cyttsp5_handle_irq(int irq, void *handle)
697 {
698 struct cyttsp5 *ts = handle;
699 int report_id;
700 int size;
701 int error;
702
703 error = cyttsp5_read(ts, ts->input_buf, CY_MAX_INPUT);
704 if (error)
705 return IRQ_HANDLED;
706
707 size = get_unaligned_le16(&ts->input_buf[0]);
708 if (size == 0) {
709 /* reset */
710 report_id = 0;
711 size = 2;
712 } else {
713 report_id = ts->input_buf[2];
714 }
715
716 switch (report_id) {
717 case HID_TOUCH_REPORT_ID:
718 cyttsp5_mt_attention(ts->dev);
719 break;
720 case HID_BTN_REPORT_ID:
721 cyttsp5_btn_attention(ts->dev);
722 break;
723 case HID_RESPONSE_REPORT_ID:
724 memcpy(ts->response_buf, ts->input_buf, size);
725 complete(&ts->cmd_done);
726 break;
727 default:
728 /* It is not an input but a command response */
729 memcpy(ts->response_buf, ts->input_buf, size);
730 complete(&ts->cmd_done);
731 }
732
733 return IRQ_HANDLED;
734 }
735
cyttsp5_deassert_int(struct cyttsp5 * ts)736 static int cyttsp5_deassert_int(struct cyttsp5 *ts)
737 {
738 u16 size;
739 u8 buf[2];
740 int error;
741
742 error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, sizeof(buf));
743 if (error < 0)
744 return error;
745
746 size = get_unaligned_le16(&buf[0]);
747 if (size == 2 || size == 0)
748 return 0;
749
750 return -EINVAL;
751 }
752
cyttsp5_fill_all_touch(struct cyttsp5 * ts)753 static int cyttsp5_fill_all_touch(struct cyttsp5 *ts)
754 {
755 struct cyttsp5_sysinfo *si = &ts->sysinfo;
756
757 fill_tch_abs(&si->tch_abs[CY_TCH_X], REPORT_SIZE_16,
758 TOUCH_REPORT_DESC_X);
759 fill_tch_abs(&si->tch_abs[CY_TCH_Y], REPORT_SIZE_16,
760 TOUCH_REPORT_DESC_Y);
761 fill_tch_abs(&si->tch_abs[CY_TCH_P], REPORT_SIZE_8,
762 TOUCH_REPORT_DESC_P);
763 fill_tch_abs(&si->tch_abs[CY_TCH_T], REPORT_SIZE_5,
764 TOUCH_REPORT_DESC_CONTACTID);
765 fill_tch_abs(&si->tch_hdr, REPORT_SIZE_5,
766 TOUCH_REPORT_DESC_HDR_CONTACTCOUNT);
767 fill_tch_abs(&si->tch_abs[CY_TCH_MAJ], REPORT_SIZE_8,
768 TOUCH_REPORT_DESC_MAJ);
769 fill_tch_abs(&si->tch_abs[CY_TCH_MIN], REPORT_SIZE_8,
770 TOUCH_REPORT_DESC_MIN);
771
772 return 0;
773 }
774
cyttsp5_startup(struct cyttsp5 * ts)775 static int cyttsp5_startup(struct cyttsp5 *ts)
776 {
777 int error;
778
779 error = cyttsp5_deassert_int(ts);
780 if (error) {
781 dev_err(ts->dev, "Error on deassert int r=%d\n", error);
782 return -ENODEV;
783 }
784
785 /*
786 * Launch the application as the device starts in bootloader mode
787 * because of a power-on-reset
788 */
789 error = cyttsp5_hid_output_bl_launch_app(ts);
790 if (error < 0) {
791 dev_err(ts->dev, "Error on launch app r=%d\n", error);
792 return error;
793 }
794
795 error = cyttsp5_get_hid_descriptor(ts, &ts->hid_desc);
796 if (error < 0) {
797 dev_err(ts->dev, "Error on getting HID descriptor r=%d\n", error);
798 return error;
799 }
800
801 error = cyttsp5_fill_all_touch(ts);
802 if (error < 0) {
803 dev_err(ts->dev, "Error on report descriptor r=%d\n", error);
804 return error;
805 }
806
807 error = cyttsp5_hid_output_get_sysinfo(ts);
808 if (error) {
809 dev_err(ts->dev, "Error on getting sysinfo r=%d\n", error);
810 return error;
811 }
812
813 return error;
814 }
815
cyttsp5_cleanup(void * data)816 static void cyttsp5_cleanup(void *data)
817 {
818 struct cyttsp5 *ts = data;
819
820 regulator_disable(ts->vdd);
821 }
822
cyttsp5_probe(struct device * dev,struct regmap * regmap,int irq,const char * name)823 static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
824 const char *name)
825 {
826 struct cyttsp5 *ts;
827 struct cyttsp5_sysinfo *si;
828 int error, i;
829
830 ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
831 if (!ts)
832 return -ENOMEM;
833
834 /* Initialize device info */
835 ts->regmap = regmap;
836 ts->dev = dev;
837 si = &ts->sysinfo;
838 dev_set_drvdata(dev, ts);
839
840 init_completion(&ts->cmd_done);
841
842 /* Power up the device */
843 ts->vdd = devm_regulator_get(dev, "vdd");
844 if (IS_ERR(ts->vdd)) {
845 error = PTR_ERR(ts->vdd);
846 return error;
847 }
848
849 error = devm_add_action_or_reset(dev, cyttsp5_cleanup, ts);
850 if (error)
851 return error;
852
853 error = regulator_enable(ts->vdd);
854 if (error)
855 return error;
856
857 ts->input = devm_input_allocate_device(dev);
858 if (!ts->input) {
859 dev_err(dev, "Error, failed to allocate input device\n");
860 return -ENODEV;
861 }
862
863 ts->input->name = "cyttsp5";
864 scnprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
865 ts->input->phys = ts->phys;
866 input_set_drvdata(ts->input, ts);
867
868 /* Reset the gpio to be in a reset state */
869 ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
870 if (IS_ERR(ts->reset_gpio)) {
871 error = PTR_ERR(ts->reset_gpio);
872 dev_err(dev, "Failed to request reset gpio, error %d\n", error);
873 return error;
874 }
875 gpiod_set_value_cansleep(ts->reset_gpio, 0);
876
877 /* Need a delay to have device up */
878 msleep(20);
879
880 error = devm_request_threaded_irq(dev, irq, NULL, cyttsp5_handle_irq,
881 IRQF_ONESHOT, name, ts);
882 if (error) {
883 dev_err(dev, "unable to request IRQ\n");
884 return error;
885 }
886
887 error = cyttsp5_startup(ts);
888 if (error) {
889 dev_err(ts->dev, "Fail initial startup r=%d\n", error);
890 return error;
891 }
892
893 error = cyttsp5_parse_dt_key_code(dev);
894 if (error < 0) {
895 dev_err(ts->dev, "Error while parsing dts %d\n", error);
896 return error;
897 }
898
899 touchscreen_parse_properties(ts->input, true, &ts->prop);
900
901 __set_bit(EV_KEY, ts->input->evbit);
902 for (i = 0; i < si->num_btns; i++)
903 __set_bit(si->key_code[i], ts->input->keybit);
904
905 return cyttsp5_setup_input_device(dev);
906 }
907
cyttsp5_i2c_probe(struct i2c_client * client)908 static int cyttsp5_i2c_probe(struct i2c_client *client)
909 {
910 struct regmap *regmap;
911 static const struct regmap_config config = {
912 .reg_bits = 8,
913 .val_bits = 8,
914 };
915
916 regmap = devm_regmap_init_i2c(client, &config);
917 if (IS_ERR(regmap)) {
918 dev_err(&client->dev, "regmap allocation failed: %ld\n",
919 PTR_ERR(regmap));
920 return PTR_ERR(regmap);
921 }
922
923 return cyttsp5_probe(&client->dev, regmap, client->irq, client->name);
924 }
925
926 static const struct of_device_id cyttsp5_of_match[] = {
927 { .compatible = "cypress,tt21000", },
928 { }
929 };
930 MODULE_DEVICE_TABLE(of, cyttsp5_of_match);
931
932 static const struct i2c_device_id cyttsp5_i2c_id[] = {
933 { CYTTSP5_NAME, 0, },
934 { }
935 };
936 MODULE_DEVICE_TABLE(i2c, cyttsp5_i2c_id);
937
cyttsp5_suspend(struct device * dev)938 static int __maybe_unused cyttsp5_suspend(struct device *dev)
939 {
940 struct cyttsp5 *ts = dev_get_drvdata(dev);
941
942 if (!device_may_wakeup(dev))
943 cyttsp5_power_control(ts, false);
944
945 return 0;
946 }
947
cyttsp5_resume(struct device * dev)948 static int __maybe_unused cyttsp5_resume(struct device *dev)
949 {
950 struct cyttsp5 *ts = dev_get_drvdata(dev);
951
952 if (!device_may_wakeup(dev))
953 cyttsp5_power_control(ts, true);
954
955 return 0;
956 }
957
958 static SIMPLE_DEV_PM_OPS(cyttsp5_pm, cyttsp5_suspend, cyttsp5_resume);
959
960 static struct i2c_driver cyttsp5_i2c_driver = {
961 .driver = {
962 .name = CYTTSP5_NAME,
963 .of_match_table = cyttsp5_of_match,
964 .pm = &cyttsp5_pm,
965 },
966 .probe = cyttsp5_i2c_probe,
967 .id_table = cyttsp5_i2c_id,
968 };
969 module_i2c_driver(cyttsp5_i2c_driver);
970
971 MODULE_LICENSE("GPL");
972 MODULE_DESCRIPTION("Touchscreen driver for Cypress TrueTouch Gen 5 Product");
973 MODULE_AUTHOR("Mylène Josserand <mylene.josserand@bootlin.com>");
974