1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ILITEK Touch IC driver for 23XX, 25XX and Lego series
4 *
5 * Copyright (C) 2011 ILI Technology Corporation.
6 * Copyright (C) 2020 Luca Hsu <luca_hsu@ilitek.com>
7 * Copyright (C) 2021 Joe Hung <joe_hung@ilitek.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/input.h>
13#include <linux/input/mt.h>
14#include <linux/i2c.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/interrupt.h>
18#include <linux/gpio/consumer.h>
19#include <linux/errno.h>
20#include <linux/acpi.h>
21#include <linux/input/touchscreen.h>
22#include <linux/unaligned.h>
23
24
25#define ILITEK_TS_NAME "ilitek_ts"
26#define BL_V1_8 0x108
27#define BL_V1_7 0x107
28#define BL_V1_6 0x106
29
30#define ILITEK_TP_CMD_GET_TP_RES 0x20
31#define ILITEK_TP_CMD_GET_SCRN_RES 0x21
32#define ILITEK_TP_CMD_SET_IC_SLEEP 0x30
33#define ILITEK_TP_CMD_SET_IC_WAKE 0x31
34#define ILITEK_TP_CMD_GET_FW_VER 0x40
35#define ILITEK_TP_CMD_GET_PRL_VER 0x42
36#define ILITEK_TP_CMD_GET_MCU_VER 0x61
37#define ILITEK_TP_CMD_GET_IC_MODE 0xC0
38
39#define ILITEK_TP_I2C_REPORT_ID 0x48
40
41#define REPORT_COUNT_ADDRESS 61
42#define ILITEK_SUPPORT_MAX_POINT 40
43
44struct ilitek_protocol_info {
45 u16 ver;
46 u8 ver_major;
47};
48
49struct ilitek_ts_data {
50 struct i2c_client *client;
51 struct gpio_desc *reset_gpio;
52 struct input_dev *input_dev;
53 struct touchscreen_properties prop;
54
55 const struct ilitek_protocol_map *ptl_cb_func;
56 struct ilitek_protocol_info ptl;
57
58 char product_id[30];
59 u16 mcu_ver;
60 u8 ic_mode;
61 u8 firmware_ver[8];
62
63 s32 reset_time;
64 s32 screen_max_x;
65 s32 screen_max_y;
66 s32 screen_min_x;
67 s32 screen_min_y;
68 s32 max_tp;
69};
70
71struct ilitek_protocol_map {
72 u16 cmd;
73 const char *name;
74 int (*func)(struct ilitek_ts_data *ts, u16 cmd, u8 *inbuf, u8 *outbuf);
75};
76
77enum ilitek_cmds {
78 /* common cmds */
79 GET_PTL_VER = 0,
80 GET_FW_VER,
81 GET_SCRN_RES,
82 GET_TP_RES,
83 GET_IC_MODE,
84 GET_MCU_VER,
85 SET_IC_SLEEP,
86 SET_IC_WAKE,
87
88 /* ALWAYS keep at the end */
89 MAX_CMD_CNT
90};
91
92/* ILITEK I2C R/W APIs */
93static int ilitek_i2c_write_and_read(struct ilitek_ts_data *ts,
94 u8 *cmd, int write_len, int delay,
95 u8 *data, int read_len)
96{
97 int error;
98 struct i2c_client *client = ts->client;
99 struct i2c_msg msgs[] = {
100 {
101 .addr = client->addr,
102 .flags = 0,
103 .len = write_len,
104 .buf = cmd,
105 },
106 {
107 .addr = client->addr,
108 .flags = I2C_M_RD,
109 .len = read_len,
110 .buf = data,
111 },
112 };
113
114 if (delay == 0 && write_len > 0 && read_len > 0) {
115 error = i2c_transfer(adap: client->adapter, msgs, ARRAY_SIZE(msgs));
116 if (error < 0)
117 return error;
118 } else {
119 if (write_len > 0) {
120 error = i2c_transfer(adap: client->adapter, msgs, num: 1);
121 if (error < 0)
122 return error;
123 }
124 if (delay > 0)
125 mdelay(delay);
126
127 if (read_len > 0) {
128 error = i2c_transfer(adap: client->adapter, msgs: msgs + 1, num: 1);
129 if (error < 0)
130 return error;
131 }
132 }
133
134 return 0;
135}
136
137/* ILITEK ISR APIs */
138static void ilitek_touch_down(struct ilitek_ts_data *ts, unsigned int id,
139 unsigned int x, unsigned int y)
140{
141 struct input_dev *input = ts->input_dev;
142
143 input_mt_slot(dev: input, slot: id);
144 input_mt_report_slot_state(dev: input, MT_TOOL_FINGER, active: true);
145
146 touchscreen_report_pos(input, prop: &ts->prop, x, y, multitouch: true);
147}
148
149static int ilitek_process_and_report_v6(struct ilitek_ts_data *ts)
150{
151 int error = 0;
152 u8 buf[512];
153 int packet_len = 5;
154 int packet_max_point = 10;
155 int report_max_point;
156 int i, count;
157 struct input_dev *input = ts->input_dev;
158 struct device *dev = &ts->client->dev;
159 unsigned int x, y, status, id;
160
161 error = ilitek_i2c_write_and_read(ts, NULL, write_len: 0, delay: 0, data: buf, read_len: 64);
162 if (error) {
163 dev_err(dev, "get touch info failed, err:%d\n", error);
164 return error;
165 }
166
167 if (buf[0] != ILITEK_TP_I2C_REPORT_ID) {
168 dev_err(dev, "get touch info failed. Wrong id: 0x%02X\n", buf[0]);
169 return -EINVAL;
170 }
171
172 report_max_point = buf[REPORT_COUNT_ADDRESS];
173 if (report_max_point > ts->max_tp) {
174 dev_err(dev, "FW report max point:%d > panel info. max:%d\n",
175 report_max_point, ts->max_tp);
176 return -EINVAL;
177 }
178
179 count = DIV_ROUND_UP(report_max_point, packet_max_point);
180 for (i = 1; i < count; i++) {
181 error = ilitek_i2c_write_and_read(ts, NULL, write_len: 0, delay: 0,
182 data: buf + i * 64, read_len: 64);
183 if (error) {
184 dev_err(dev, "get touch info. failed, cnt:%d, err:%d\n",
185 count, error);
186 return error;
187 }
188 }
189
190 for (i = 0; i < report_max_point; i++) {
191 status = buf[i * packet_len + 1] & 0x40;
192 if (!status)
193 continue;
194
195 id = buf[i * packet_len + 1] & 0x3F;
196
197 x = get_unaligned_le16(p: buf + i * packet_len + 2);
198 y = get_unaligned_le16(p: buf + i * packet_len + 4);
199
200 if (x > ts->screen_max_x || x < ts->screen_min_x ||
201 y > ts->screen_max_y || y < ts->screen_min_y) {
202 dev_warn(dev, "invalid position, X[%d,%u,%d], Y[%d,%u,%d]\n",
203 ts->screen_min_x, x, ts->screen_max_x,
204 ts->screen_min_y, y, ts->screen_max_y);
205 continue;
206 }
207
208 ilitek_touch_down(ts, id, x, y);
209 }
210
211 input_mt_sync_frame(dev: input);
212 input_sync(dev: input);
213
214 return 0;
215}
216
217/* APIs of cmds for ILITEK Touch IC */
218static int api_protocol_set_cmd(struct ilitek_ts_data *ts,
219 u16 idx, u8 *inbuf, u8 *outbuf)
220{
221 u16 cmd;
222 int error;
223
224 if (idx >= MAX_CMD_CNT)
225 return -EINVAL;
226
227 cmd = ts->ptl_cb_func[idx].cmd;
228 error = ts->ptl_cb_func[idx].func(ts, cmd, inbuf, outbuf);
229 if (error)
230 return error;
231
232 return 0;
233}
234
235static int api_protocol_get_ptl_ver(struct ilitek_ts_data *ts,
236 u16 cmd, u8 *inbuf, u8 *outbuf)
237{
238 int error;
239 u8 buf[64];
240
241 buf[0] = cmd;
242 error = ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 5, data: outbuf, read_len: 3);
243 if (error)
244 return error;
245
246 ts->ptl.ver = get_unaligned_be16(p: outbuf);
247 ts->ptl.ver_major = outbuf[0];
248
249 return 0;
250}
251
252static int api_protocol_get_mcu_ver(struct ilitek_ts_data *ts,
253 u16 cmd, u8 *inbuf, u8 *outbuf)
254{
255 int error;
256 u8 buf[64];
257
258 buf[0] = cmd;
259 error = ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 5, data: outbuf, read_len: 32);
260 if (error)
261 return error;
262
263 ts->mcu_ver = get_unaligned_le16(p: outbuf);
264 memset(ts->product_id, 0, sizeof(ts->product_id));
265 memcpy(ts->product_id, outbuf + 6, 26);
266
267 return 0;
268}
269
270static int api_protocol_get_fw_ver(struct ilitek_ts_data *ts,
271 u16 cmd, u8 *inbuf, u8 *outbuf)
272{
273 int error;
274 u8 buf[64];
275
276 buf[0] = cmd;
277 error = ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 5, data: outbuf, read_len: 8);
278 if (error)
279 return error;
280
281 memcpy(ts->firmware_ver, outbuf, 8);
282
283 return 0;
284}
285
286static int api_protocol_get_scrn_res(struct ilitek_ts_data *ts,
287 u16 cmd, u8 *inbuf, u8 *outbuf)
288{
289 int error;
290 u8 buf[64];
291
292 buf[0] = cmd;
293 error = ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 5, data: outbuf, read_len: 8);
294 if (error)
295 return error;
296
297 ts->screen_min_x = get_unaligned_le16(p: outbuf);
298 ts->screen_min_y = get_unaligned_le16(p: outbuf + 2);
299 ts->screen_max_x = get_unaligned_le16(p: outbuf + 4);
300 ts->screen_max_y = get_unaligned_le16(p: outbuf + 6);
301
302 return 0;
303}
304
305static int api_protocol_get_tp_res(struct ilitek_ts_data *ts,
306 u16 cmd, u8 *inbuf, u8 *outbuf)
307{
308 int error;
309 u8 buf[64];
310
311 buf[0] = cmd;
312 error = ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 5, data: outbuf, read_len: 15);
313 if (error)
314 return error;
315
316 ts->max_tp = outbuf[8];
317 if (ts->max_tp > ILITEK_SUPPORT_MAX_POINT) {
318 dev_err(&ts->client->dev, "Invalid MAX_TP:%d from FW\n",
319 ts->max_tp);
320 return -EINVAL;
321 }
322
323 return 0;
324}
325
326static int api_protocol_get_ic_mode(struct ilitek_ts_data *ts,
327 u16 cmd, u8 *inbuf, u8 *outbuf)
328{
329 int error;
330 u8 buf[64];
331
332 buf[0] = cmd;
333 error = ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 5, data: outbuf, read_len: 2);
334 if (error)
335 return error;
336
337 ts->ic_mode = outbuf[0];
338 return 0;
339}
340
341static int api_protocol_set_ic_sleep(struct ilitek_ts_data *ts,
342 u16 cmd, u8 *inbuf, u8 *outbuf)
343{
344 u8 buf[64];
345
346 buf[0] = cmd;
347 return ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 0, NULL, read_len: 0);
348}
349
350static int api_protocol_set_ic_wake(struct ilitek_ts_data *ts,
351 u16 cmd, u8 *inbuf, u8 *outbuf)
352{
353 u8 buf[64];
354
355 buf[0] = cmd;
356 return ilitek_i2c_write_and_read(ts, cmd: buf, write_len: 1, delay: 0, NULL, read_len: 0);
357}
358
359static const struct ilitek_protocol_map ptl_func_map[] = {
360 /* common cmds */
361 [GET_PTL_VER] = {
362 ILITEK_TP_CMD_GET_PRL_VER, "GET_PTL_VER",
363 api_protocol_get_ptl_ver
364 },
365 [GET_FW_VER] = {
366 ILITEK_TP_CMD_GET_FW_VER, "GET_FW_VER",
367 api_protocol_get_fw_ver
368 },
369 [GET_SCRN_RES] = {
370 ILITEK_TP_CMD_GET_SCRN_RES, "GET_SCRN_RES",
371 api_protocol_get_scrn_res
372 },
373 [GET_TP_RES] = {
374 ILITEK_TP_CMD_GET_TP_RES, "GET_TP_RES",
375 api_protocol_get_tp_res
376 },
377 [GET_IC_MODE] = {
378 ILITEK_TP_CMD_GET_IC_MODE, "GET_IC_MODE",
379 api_protocol_get_ic_mode
380 },
381 [GET_MCU_VER] = {
382 ILITEK_TP_CMD_GET_MCU_VER, "GET_MOD_VER",
383 api_protocol_get_mcu_ver
384 },
385 [SET_IC_SLEEP] = {
386 ILITEK_TP_CMD_SET_IC_SLEEP, "SET_IC_SLEEP",
387 api_protocol_set_ic_sleep
388 },
389 [SET_IC_WAKE] = {
390 ILITEK_TP_CMD_SET_IC_WAKE, "SET_IC_WAKE",
391 api_protocol_set_ic_wake
392 },
393};
394
395/* Probe APIs */
396static void ilitek_reset(struct ilitek_ts_data *ts, int delay)
397{
398 if (ts->reset_gpio) {
399 gpiod_set_value(desc: ts->reset_gpio, value: 1);
400 mdelay(10);
401 gpiod_set_value(desc: ts->reset_gpio, value: 0);
402 mdelay(delay);
403 }
404}
405
406static int ilitek_protocol_init(struct ilitek_ts_data *ts)
407{
408 int error;
409 u8 outbuf[64];
410
411 ts->ptl_cb_func = ptl_func_map;
412 ts->reset_time = 600;
413
414 error = api_protocol_set_cmd(ts, idx: GET_PTL_VER, NULL, outbuf);
415 if (error)
416 return error;
417
418 /* Protocol v3 is not support currently */
419 if (ts->ptl.ver_major == 0x3 ||
420 ts->ptl.ver == BL_V1_6 ||
421 ts->ptl.ver == BL_V1_7)
422 return -EINVAL;
423
424 return 0;
425}
426
427static int ilitek_read_tp_info(struct ilitek_ts_data *ts, bool boot)
428{
429 u8 outbuf[256];
430 int error;
431
432 error = api_protocol_set_cmd(ts, idx: GET_PTL_VER, NULL, outbuf);
433 if (error)
434 return error;
435
436 error = api_protocol_set_cmd(ts, idx: GET_MCU_VER, NULL, outbuf);
437 if (error)
438 return error;
439
440 error = api_protocol_set_cmd(ts, idx: GET_FW_VER, NULL, outbuf);
441 if (error)
442 return error;
443
444 if (boot) {
445 error = api_protocol_set_cmd(ts, idx: GET_SCRN_RES, NULL,
446 outbuf);
447 if (error)
448 return error;
449 }
450
451 error = api_protocol_set_cmd(ts, idx: GET_TP_RES, NULL, outbuf);
452 if (error)
453 return error;
454
455 error = api_protocol_set_cmd(ts, idx: GET_IC_MODE, NULL, outbuf);
456 if (error)
457 return error;
458
459 return 0;
460}
461
462static int ilitek_input_dev_init(struct device *dev, struct ilitek_ts_data *ts)
463{
464 int error;
465 struct input_dev *input;
466
467 input = devm_input_allocate_device(dev);
468 if (!input)
469 return -ENOMEM;
470
471 ts->input_dev = input;
472 input->name = ILITEK_TS_NAME;
473 input->id.bustype = BUS_I2C;
474
475 __set_bit(INPUT_PROP_DIRECT, input->propbit);
476
477 input_set_abs_params(dev: input, ABS_MT_POSITION_X,
478 min: ts->screen_min_x, max: ts->screen_max_x, fuzz: 0, flat: 0);
479 input_set_abs_params(dev: input, ABS_MT_POSITION_Y,
480 min: ts->screen_min_y, max: ts->screen_max_y, fuzz: 0, flat: 0);
481
482 touchscreen_parse_properties(input, multitouch: true, prop: &ts->prop);
483
484 error = input_mt_init_slots(dev: input, num_slots: ts->max_tp,
485 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
486 if (error) {
487 dev_err(dev, "initialize MT slots failed, err:%d\n", error);
488 return error;
489 }
490
491 error = input_register_device(input);
492 if (error) {
493 dev_err(dev, "register input device failed, err:%d\n", error);
494 return error;
495 }
496
497 return 0;
498}
499
500static irqreturn_t ilitek_i2c_isr(int irq, void *dev_id)
501{
502 struct ilitek_ts_data *ts = dev_id;
503 int error;
504
505 error = ilitek_process_and_report_v6(ts);
506 if (error < 0) {
507 dev_err(&ts->client->dev, "[%s] err:%d\n", __func__, error);
508 return IRQ_NONE;
509 }
510
511 return IRQ_HANDLED;
512}
513
514static ssize_t firmware_version_show(struct device *dev,
515 struct device_attribute *attr, char *buf)
516{
517 struct i2c_client *client = to_i2c_client(dev);
518 struct ilitek_ts_data *ts = i2c_get_clientdata(client);
519
520 return sysfs_emit(buf,
521 fmt: "fw version: [%02X%02X.%02X%02X.%02X%02X.%02X%02X]\n",
522 ts->firmware_ver[0], ts->firmware_ver[1],
523 ts->firmware_ver[2], ts->firmware_ver[3],
524 ts->firmware_ver[4], ts->firmware_ver[5],
525 ts->firmware_ver[6], ts->firmware_ver[7]);
526}
527static DEVICE_ATTR_RO(firmware_version);
528
529static ssize_t product_id_show(struct device *dev,
530 struct device_attribute *attr, char *buf)
531{
532 struct i2c_client *client = to_i2c_client(dev);
533 struct ilitek_ts_data *ts = i2c_get_clientdata(client);
534
535 return sysfs_emit(buf, fmt: "product id: [%04X], module: [%s]\n",
536 ts->mcu_ver, ts->product_id);
537}
538static DEVICE_ATTR_RO(product_id);
539
540static struct attribute *ilitek_sysfs_attrs[] = {
541 &dev_attr_firmware_version.attr,
542 &dev_attr_product_id.attr,
543 NULL
544};
545ATTRIBUTE_GROUPS(ilitek_sysfs);
546
547static int ilitek_ts_i2c_probe(struct i2c_client *client)
548{
549 struct ilitek_ts_data *ts;
550 struct device *dev = &client->dev;
551 int error;
552
553 if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_I2C)) {
554 dev_err(dev, "i2c check functionality failed\n");
555 return -ENXIO;
556 }
557
558 ts = devm_kzalloc(dev, size: sizeof(*ts), GFP_KERNEL);
559 if (!ts)
560 return -ENOMEM;
561
562 ts->client = client;
563 i2c_set_clientdata(client, data: ts);
564
565 ts->reset_gpio = devm_gpiod_get_optional(dev, con_id: "reset", flags: GPIOD_OUT_LOW);
566 if (IS_ERR(ptr: ts->reset_gpio)) {
567 error = PTR_ERR(ptr: ts->reset_gpio);
568 dev_err(dev, "request gpiod failed: %d", error);
569 return error;
570 }
571
572 ilitek_reset(ts, delay: 1000);
573
574 error = ilitek_protocol_init(ts);
575 if (error) {
576 dev_err(dev, "protocol init failed: %d", error);
577 return error;
578 }
579
580 error = ilitek_read_tp_info(ts, boot: true);
581 if (error) {
582 dev_err(dev, "read tp info failed: %d", error);
583 return error;
584 }
585
586 error = ilitek_input_dev_init(dev, ts);
587 if (error) {
588 dev_err(dev, "input dev init failed: %d", error);
589 return error;
590 }
591
592 error = devm_request_threaded_irq(dev, irq: ts->client->irq,
593 NULL, thread_fn: ilitek_i2c_isr, IRQF_ONESHOT,
594 devname: "ilitek_touch_irq", dev_id: ts);
595 if (error) {
596 dev_err(dev, "request threaded irq failed: %d\n", error);
597 return error;
598 }
599
600 return 0;
601}
602
603static int ilitek_suspend(struct device *dev)
604{
605 struct i2c_client *client = to_i2c_client(dev);
606 struct ilitek_ts_data *ts = i2c_get_clientdata(client);
607 int error;
608
609 disable_irq(irq: client->irq);
610
611 if (!device_may_wakeup(dev)) {
612 error = api_protocol_set_cmd(ts, idx: SET_IC_SLEEP, NULL, NULL);
613 if (error)
614 return error;
615 }
616
617 return 0;
618}
619
620static int ilitek_resume(struct device *dev)
621{
622 struct i2c_client *client = to_i2c_client(dev);
623 struct ilitek_ts_data *ts = i2c_get_clientdata(client);
624 int error;
625
626 if (!device_may_wakeup(dev)) {
627 error = api_protocol_set_cmd(ts, idx: SET_IC_WAKE, NULL, NULL);
628 if (error)
629 return error;
630
631 ilitek_reset(ts, delay: ts->reset_time);
632 }
633
634 enable_irq(irq: client->irq);
635
636 return 0;
637}
638
639static DEFINE_SIMPLE_DEV_PM_OPS(ilitek_pm_ops, ilitek_suspend, ilitek_resume);
640
641static const struct i2c_device_id ilitek_ts_i2c_id[] = {
642 { ILITEK_TS_NAME },
643 { }
644};
645MODULE_DEVICE_TABLE(i2c, ilitek_ts_i2c_id);
646
647#ifdef CONFIG_ACPI
648static const struct acpi_device_id ilitekts_acpi_id[] = {
649 { "ILTK0001", 0 },
650 { },
651};
652MODULE_DEVICE_TABLE(acpi, ilitekts_acpi_id);
653#endif
654
655#ifdef CONFIG_OF
656static const struct of_device_id ilitek_ts_i2c_match[] = {
657 {.compatible = "ilitek,ili2130",},
658 {.compatible = "ilitek,ili2131",},
659 {.compatible = "ilitek,ili2132",},
660 {.compatible = "ilitek,ili2316",},
661 {.compatible = "ilitek,ili2322",},
662 {.compatible = "ilitek,ili2323",},
663 {.compatible = "ilitek,ili2326",},
664 {.compatible = "ilitek,ili2520",},
665 {.compatible = "ilitek,ili2521",},
666 { },
667};
668MODULE_DEVICE_TABLE(of, ilitek_ts_i2c_match);
669#endif
670
671static struct i2c_driver ilitek_ts_i2c_driver = {
672 .driver = {
673 .name = ILITEK_TS_NAME,
674 .dev_groups = ilitek_sysfs_groups,
675 .pm = pm_sleep_ptr(&ilitek_pm_ops),
676 .of_match_table = of_match_ptr(ilitek_ts_i2c_match),
677 .acpi_match_table = ACPI_PTR(ilitekts_acpi_id),
678 },
679 .probe = ilitek_ts_i2c_probe,
680 .id_table = ilitek_ts_i2c_id,
681};
682module_i2c_driver(ilitek_ts_i2c_driver);
683
684MODULE_AUTHOR("ILITEK");
685MODULE_DESCRIPTION("ILITEK I2C Touchscreen Driver");
686MODULE_LICENSE("GPL");
687

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source code of linux/drivers/input/touchscreen/ilitek_ts_i2c.c