Loading...
Note: File does not exist in v3.1.
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Goodix "Berlin" Touchscreen IC driver
4 * Copyright (C) 2020 - 2021 Goodix, Inc.
5 * Copyright (C) 2023 Linaro Ltd.
6 *
7 * Based on goodix_ts_berlin driver.
8 *
9 * This driver is distinct from goodix.c since hardware interface
10 * is different enough to require a new driver.
11 * None of the register address or data structure are close enough
12 * to the previous generations.
13 *
14 * Currently the driver only handles Multitouch events with already
15 * programmed firmware and "config" for "Revision D" Berlin IC.
16 *
17 * Support is missing for:
18 * - ESD Management
19 * - Firmware update/flashing
20 * - "Config" update/flashing
21 * - Stylus Events
22 * - Gesture Events
23 * - Support for older revisions (A & B)
24 */
25
26#include <linux/bitfield.h>
27#include <linux/gpio/consumer.h>
28#include <linux/input.h>
29#include <linux/input/mt.h>
30#include <linux/input/touchscreen.h>
31#include <linux/regmap.h>
32#include <linux/regulator/consumer.h>
33#include <linux/sizes.h>
34#include <linux/unaligned.h>
35
36#include "goodix_berlin.h"
37
38#define GOODIX_BERLIN_MAX_TOUCH 10
39
40#define GOODIX_BERLIN_NORMAL_RESET_DELAY_MS 100
41
42#define GOODIX_BERLIN_TOUCH_EVENT BIT(7)
43#define GOODIX_BERLIN_REQUEST_EVENT BIT(6)
44#define GOODIX_BERLIN_TOUCH_COUNT_MASK GENMASK(3, 0)
45
46#define GOODIX_BERLIN_REQUEST_CODE_RESET 3
47
48#define GOODIX_BERLIN_POINT_TYPE_MASK GENMASK(3, 0)
49#define GOODIX_BERLIN_POINT_TYPE_STYLUS_HOVER 1
50#define GOODIX_BERLIN_POINT_TYPE_STYLUS 3
51
52#define GOODIX_BERLIN_TOUCH_ID_MASK GENMASK(7, 4)
53
54#define GOODIX_BERLIN_DEV_CONFIRM_VAL 0xAA
55#define GOODIX_BERLIN_BOOTOPTION_ADDR 0x10000
56#define GOODIX_BERLIN_FW_VERSION_INFO_ADDR 0x10014
57
58#define GOODIX_BERLIN_IC_INFO_MAX_LEN SZ_1K
59#define GOODIX_BERLIN_IC_INFO_ADDR 0x10070
60
61#define GOODIX_BERLIN_CHECKSUM_SIZE sizeof(u16)
62
63struct goodix_berlin_fw_version {
64 u8 rom_pid[6];
65 u8 rom_vid[3];
66 u8 rom_vid_reserved;
67 u8 patch_pid[8];
68 u8 patch_vid[4];
69 u8 patch_vid_reserved;
70 u8 sensor_id;
71 u8 reserved[2];
72 __le16 checksum;
73};
74
75struct goodix_berlin_ic_info_version {
76 u8 info_customer_id;
77 u8 info_version_id;
78 u8 ic_die_id;
79 u8 ic_version_id;
80 __le32 config_id;
81 u8 config_version;
82 u8 frame_data_customer_id;
83 u8 frame_data_version_id;
84 u8 touch_data_customer_id;
85 u8 touch_data_version_id;
86 u8 reserved[3];
87} __packed;
88
89struct goodix_berlin_ic_info_feature {
90 __le16 freqhop_feature;
91 __le16 calibration_feature;
92 __le16 gesture_feature;
93 __le16 side_touch_feature;
94 __le16 stylus_feature;
95} __packed;
96
97struct goodix_berlin_ic_info_misc {
98 __le32 cmd_addr;
99 __le16 cmd_max_len;
100 __le32 cmd_reply_addr;
101 __le16 cmd_reply_len;
102 __le32 fw_state_addr;
103 __le16 fw_state_len;
104 __le32 fw_buffer_addr;
105 __le16 fw_buffer_max_len;
106 __le32 frame_data_addr;
107 __le16 frame_data_head_len;
108 __le16 fw_attr_len;
109 __le16 fw_log_len;
110 u8 pack_max_num;
111 u8 pack_compress_version;
112 __le16 stylus_struct_len;
113 __le16 mutual_struct_len;
114 __le16 self_struct_len;
115 __le16 noise_struct_len;
116 __le32 touch_data_addr;
117 __le16 touch_data_head_len;
118 __le16 point_struct_len;
119 __le16 reserved1;
120 __le16 reserved2;
121 __le32 mutual_rawdata_addr;
122 __le32 mutual_diffdata_addr;
123 __le32 mutual_refdata_addr;
124 __le32 self_rawdata_addr;
125 __le32 self_diffdata_addr;
126 __le32 self_refdata_addr;
127 __le32 iq_rawdata_addr;
128 __le32 iq_refdata_addr;
129 __le32 im_rawdata_addr;
130 __le16 im_readata_len;
131 __le32 noise_rawdata_addr;
132 __le16 noise_rawdata_len;
133 __le32 stylus_rawdata_addr;
134 __le16 stylus_rawdata_len;
135 __le32 noise_data_addr;
136 __le32 esd_addr;
137} __packed;
138
139struct goodix_berlin_touch {
140 u8 status;
141 u8 reserved;
142 __le16 x;
143 __le16 y;
144 __le16 w;
145};
146#define GOODIX_BERLIN_TOUCH_SIZE sizeof(struct goodix_berlin_touch)
147
148struct goodix_berlin_header {
149 u8 status;
150 u8 reserved1;
151 u8 request_type;
152 u8 reserved2[3];
153 __le16 checksum;
154};
155#define GOODIX_BERLIN_HEADER_SIZE sizeof(struct goodix_berlin_header)
156
157struct goodix_berlin_event {
158 struct goodix_berlin_header hdr;
159 /* The data below is u16/__le16 aligned */
160 u8 data[GOODIX_BERLIN_TOUCH_SIZE * GOODIX_BERLIN_MAX_TOUCH +
161 GOODIX_BERLIN_CHECKSUM_SIZE];
162};
163
164struct goodix_berlin_core {
165 struct device *dev;
166 struct regmap *regmap;
167 struct regulator *avdd;
168 struct regulator *iovdd;
169 struct gpio_desc *reset_gpio;
170 struct touchscreen_properties props;
171 struct goodix_berlin_fw_version fw_version;
172 struct input_dev *input_dev;
173 int irq;
174
175 /* Runtime parameters extracted from IC_INFO buffer */
176 u32 touch_data_addr;
177
178 struct goodix_berlin_event event;
179};
180
181static bool goodix_berlin_checksum_valid(const u8 *data, int size)
182{
183 u32 cal_checksum = 0;
184 u16 r_checksum;
185 int i;
186
187 if (size < GOODIX_BERLIN_CHECKSUM_SIZE)
188 return false;
189
190 for (i = 0; i < size - GOODIX_BERLIN_CHECKSUM_SIZE; i++)
191 cal_checksum += data[i];
192
193 r_checksum = get_unaligned_le16(&data[i]);
194
195 return (u16)cal_checksum == r_checksum;
196}
197
198static bool goodix_berlin_is_dummy_data(struct goodix_berlin_core *cd,
199 const u8 *data, int size)
200{
201 int i;
202
203 /*
204 * If the device is missing or doesn't respond the buffer
205 * could be filled with bus default line state, 0x00 or 0xff,
206 * so declare success the first time we encounter neither.
207 */
208 for (i = 0; i < size; i++)
209 if (data[i] > 0 && data[i] < 0xff)
210 return false;
211
212 return true;
213}
214
215static int goodix_berlin_dev_confirm(struct goodix_berlin_core *cd)
216{
217 u8 tx_buf[8], rx_buf[8];
218 int retry = 3;
219 int error;
220
221 memset(tx_buf, GOODIX_BERLIN_DEV_CONFIRM_VAL, sizeof(tx_buf));
222 while (retry--) {
223 error = regmap_raw_write(cd->regmap,
224 GOODIX_BERLIN_BOOTOPTION_ADDR,
225 tx_buf, sizeof(tx_buf));
226 if (error)
227 return error;
228
229 error = regmap_raw_read(cd->regmap,
230 GOODIX_BERLIN_BOOTOPTION_ADDR,
231 rx_buf, sizeof(rx_buf));
232 if (error)
233 return error;
234
235 if (!memcmp(tx_buf, rx_buf, sizeof(tx_buf)))
236 return 0;
237
238 usleep_range(5000, 5100);
239 }
240
241 dev_err(cd->dev, "device confirm failed, rx_buf: %*ph\n",
242 (int)sizeof(rx_buf), rx_buf);
243
244 return -EINVAL;
245}
246
247static int goodix_berlin_power_on(struct goodix_berlin_core *cd)
248{
249 int error;
250
251 error = regulator_enable(cd->iovdd);
252 if (error) {
253 dev_err(cd->dev, "Failed to enable iovdd: %d\n", error);
254 return error;
255 }
256
257 /* Vendor waits 3ms for IOVDD to settle */
258 usleep_range(3000, 3100);
259
260 error = regulator_enable(cd->avdd);
261 if (error) {
262 dev_err(cd->dev, "Failed to enable avdd: %d\n", error);
263 goto err_iovdd_disable;
264 }
265
266 /* Vendor waits 15ms for IOVDD to settle */
267 usleep_range(15000, 15100);
268
269 gpiod_set_value_cansleep(cd->reset_gpio, 0);
270
271 /* Vendor waits 4ms for Firmware to initialize */
272 usleep_range(4000, 4100);
273
274 error = goodix_berlin_dev_confirm(cd);
275 if (error)
276 goto err_dev_reset;
277
278 /* Vendor waits 100ms for Firmware to fully boot */
279 msleep(GOODIX_BERLIN_NORMAL_RESET_DELAY_MS);
280
281 return 0;
282
283err_dev_reset:
284 gpiod_set_value_cansleep(cd->reset_gpio, 1);
285 regulator_disable(cd->avdd);
286err_iovdd_disable:
287 regulator_disable(cd->iovdd);
288 return error;
289}
290
291static void goodix_berlin_power_off(struct goodix_berlin_core *cd)
292{
293 gpiod_set_value_cansleep(cd->reset_gpio, 1);
294 regulator_disable(cd->avdd);
295 regulator_disable(cd->iovdd);
296}
297
298static int goodix_berlin_read_version(struct goodix_berlin_core *cd)
299{
300 int error;
301
302 error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_FW_VERSION_INFO_ADDR,
303 &cd->fw_version, sizeof(cd->fw_version));
304 if (error) {
305 dev_err(cd->dev, "error reading fw version, %d\n", error);
306 return error;
307 }
308
309 if (!goodix_berlin_checksum_valid((u8 *)&cd->fw_version,
310 sizeof(cd->fw_version))) {
311 dev_err(cd->dev, "invalid fw version: checksum error\n");
312 return -EINVAL;
313 }
314
315 return 0;
316}
317
318/* Only extract necessary data for runtime */
319static int goodix_berlin_parse_ic_info(struct goodix_berlin_core *cd,
320 const u8 *data, u16 length)
321{
322 struct goodix_berlin_ic_info_misc *misc;
323 unsigned int offset = 0;
324
325 offset += sizeof(__le16); /* length */
326 offset += sizeof(struct goodix_berlin_ic_info_version);
327 offset += sizeof(struct goodix_berlin_ic_info_feature);
328
329 /* IC_INFO Parameters, variable width structure */
330 offset += 4 * sizeof(u8); /* drv_num, sen_num, button_num, force_num */
331 if (offset >= length)
332 goto invalid_offset;
333
334#define ADVANCE_LE16_PARAMS() \
335 do { \
336 u8 param_num = data[offset++]; \
337 offset += param_num * sizeof(__le16); \
338 if (offset >= length) \
339 goto invalid_offset; \
340 } while (0)
341 ADVANCE_LE16_PARAMS(); /* active_scan_rate_num */
342 ADVANCE_LE16_PARAMS(); /* mutual_freq_num*/
343 ADVANCE_LE16_PARAMS(); /* self_tx_freq_num */
344 ADVANCE_LE16_PARAMS(); /* self_rx_freq_num */
345 ADVANCE_LE16_PARAMS(); /* stylus_freq_num */
346#undef ADVANCE_LE16_PARAMS
347
348 misc = (struct goodix_berlin_ic_info_misc *)&data[offset];
349 cd->touch_data_addr = le32_to_cpu(misc->touch_data_addr);
350
351 return 0;
352
353invalid_offset:
354 dev_err(cd->dev, "ic_info length is invalid (offset %d length %d)\n",
355 offset, length);
356 return -EINVAL;
357}
358
359static int goodix_berlin_get_ic_info(struct goodix_berlin_core *cd)
360{
361 u8 *afe_data __free(kfree) = NULL;
362 __le16 length_raw;
363 u16 length;
364 int error;
365
366 afe_data = kzalloc(GOODIX_BERLIN_IC_INFO_MAX_LEN, GFP_KERNEL);
367 if (!afe_data)
368 return -ENOMEM;
369
370 error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
371 &length_raw, sizeof(length_raw));
372 if (error) {
373 dev_err(cd->dev, "failed get ic info length, %d\n", error);
374 return error;
375 }
376
377 length = le16_to_cpu(length_raw);
378 if (length >= GOODIX_BERLIN_IC_INFO_MAX_LEN) {
379 dev_err(cd->dev, "invalid ic info length %d\n", length);
380 return -EINVAL;
381 }
382
383 error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
384 afe_data, length);
385 if (error) {
386 dev_err(cd->dev, "failed get ic info data, %d\n", error);
387 return error;
388 }
389
390 /* check whether the data is valid (ex. bus default values) */
391 if (goodix_berlin_is_dummy_data(cd, afe_data, length)) {
392 dev_err(cd->dev, "fw info data invalid\n");
393 return -EINVAL;
394 }
395
396 if (!goodix_berlin_checksum_valid(afe_data, length)) {
397 dev_err(cd->dev, "fw info checksum error\n");
398 return -EINVAL;
399 }
400
401 error = goodix_berlin_parse_ic_info(cd, afe_data, length);
402 if (error)
403 return error;
404
405 /* check some key info */
406 if (!cd->touch_data_addr) {
407 dev_err(cd->dev, "touch_data_addr is null\n");
408 return -EINVAL;
409 }
410
411 return 0;
412}
413
414static int goodix_berlin_get_remaining_contacts(struct goodix_berlin_core *cd,
415 int n)
416{
417 size_t offset = 2 * GOODIX_BERLIN_TOUCH_SIZE +
418 GOODIX_BERLIN_CHECKSUM_SIZE;
419 u32 addr = cd->touch_data_addr + GOODIX_BERLIN_HEADER_SIZE + offset;
420 int error;
421
422 error = regmap_raw_read(cd->regmap, addr,
423 &cd->event.data[offset],
424 (n - 2) * GOODIX_BERLIN_TOUCH_SIZE);
425 if (error) {
426 dev_err_ratelimited(cd->dev, "failed to get touch data, %d\n",
427 error);
428 return error;
429 }
430
431 return 0;
432}
433
434static void goodix_berlin_report_state(struct goodix_berlin_core *cd, int n)
435{
436 struct goodix_berlin_touch *touch_data =
437 (struct goodix_berlin_touch *)cd->event.data;
438 struct goodix_berlin_touch *t;
439 int i;
440 u8 type, id;
441
442 for (i = 0; i < n; i++) {
443 t = &touch_data[i];
444
445 type = FIELD_GET(GOODIX_BERLIN_POINT_TYPE_MASK, t->status);
446 if (type == GOODIX_BERLIN_POINT_TYPE_STYLUS ||
447 type == GOODIX_BERLIN_POINT_TYPE_STYLUS_HOVER) {
448 dev_warn_once(cd->dev, "Stylus event type not handled\n");
449 continue;
450 }
451
452 id = FIELD_GET(GOODIX_BERLIN_TOUCH_ID_MASK, t->status);
453 if (id >= GOODIX_BERLIN_MAX_TOUCH) {
454 dev_warn_ratelimited(cd->dev, "invalid finger id %d\n", id);
455 continue;
456 }
457
458 input_mt_slot(cd->input_dev, id);
459 input_mt_report_slot_state(cd->input_dev, MT_TOOL_FINGER, true);
460
461 touchscreen_report_pos(cd->input_dev, &cd->props,
462 __le16_to_cpu(t->x), __le16_to_cpu(t->y),
463 true);
464 input_report_abs(cd->input_dev, ABS_MT_TOUCH_MAJOR,
465 __le16_to_cpu(t->w));
466 }
467
468 input_mt_sync_frame(cd->input_dev);
469 input_sync(cd->input_dev);
470}
471
472static void goodix_berlin_touch_handler(struct goodix_berlin_core *cd)
473{
474 u8 touch_num;
475 int error;
476
477 touch_num = FIELD_GET(GOODIX_BERLIN_TOUCH_COUNT_MASK,
478 cd->event.hdr.request_type);
479 if (touch_num > GOODIX_BERLIN_MAX_TOUCH) {
480 dev_warn(cd->dev, "invalid touch num %d\n", touch_num);
481 return;
482 }
483
484 if (touch_num > 2) {
485 /* read additional contact data if more than 2 touch events */
486 error = goodix_berlin_get_remaining_contacts(cd, touch_num);
487 if (error)
488 return;
489 }
490
491 if (touch_num) {
492 int len = touch_num * GOODIX_BERLIN_TOUCH_SIZE +
493 GOODIX_BERLIN_CHECKSUM_SIZE;
494 if (!goodix_berlin_checksum_valid(cd->event.data, len)) {
495 dev_err(cd->dev, "touch data checksum error: %*ph\n",
496 len, cd->event.data);
497 return;
498 }
499 }
500
501 goodix_berlin_report_state(cd, touch_num);
502}
503
504static int goodix_berlin_request_handle_reset(struct goodix_berlin_core *cd)
505{
506 gpiod_set_value_cansleep(cd->reset_gpio, 1);
507 usleep_range(2000, 2100);
508 gpiod_set_value_cansleep(cd->reset_gpio, 0);
509
510 msleep(GOODIX_BERLIN_NORMAL_RESET_DELAY_MS);
511
512 return 0;
513}
514
515static irqreturn_t goodix_berlin_irq(int irq, void *data)
516{
517 struct goodix_berlin_core *cd = data;
518 int error;
519
520 /*
521 * First, read buffer with space for 2 touch events:
522 * - GOODIX_BERLIN_HEADER_SIZE = 8 bytes
523 * - GOODIX_BERLIN_TOUCH_SIZE * 2 = 16 bytes
524 * - GOODIX_BERLIN_CHECKLSUM_SIZE = 2 bytes
525 * For a total of 26 bytes.
526 *
527 * If only a single finger is reported, we will read 8 bytes more than
528 * needed:
529 * - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
530 * - bytes 8-15: Finger 0 Data
531 * - bytes 24-25: Checksum
532 * - bytes 18-25: Unused 8 bytes
533 *
534 * If 2 fingers are reported, we would have read the exact needed
535 * amount of data and checksum would be at the end of the buffer:
536 * - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
537 * - bytes 8-15: Finger 0 Bytes 0-7
538 * - bytes 16-23: Finger 1 Bytes 0-7
539 * - bytes 24-25: Checksum
540 *
541 * If more than 2 fingers were reported, the "Checksum" bytes would
542 * in fact contain part of the next finger data, and then
543 * goodix_berlin_get_remaining_contacts() would complete the buffer
544 * with the missing bytes, including the trailing checksum.
545 * For example, if 3 fingers are reported, then we would do:
546 * Read 1:
547 * - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
548 * - bytes 8-15: Finger 0 Bytes 0-7
549 * - bytes 16-23: Finger 1 Bytes 0-7
550 * - bytes 24-25: Finger 2 Bytes 0-1
551 * Read 2 (with length of (3 - 2) * 8 = 8 bytes):
552 * - bytes 26-31: Finger 2 Bytes 2-7
553 * - bytes 32-33: Checksum
554 */
555 error = regmap_raw_read(cd->regmap, cd->touch_data_addr,
556 &cd->event,
557 GOODIX_BERLIN_HEADER_SIZE +
558 2 * GOODIX_BERLIN_TOUCH_SIZE +
559 GOODIX_BERLIN_CHECKSUM_SIZE);
560 if (error) {
561 dev_warn_ratelimited(cd->dev,
562 "failed get event head data: %d\n", error);
563 goto out;
564 }
565
566 if (cd->event.hdr.status == 0)
567 goto out;
568
569 if (!goodix_berlin_checksum_valid((u8 *)&cd->event.hdr,
570 GOODIX_BERLIN_HEADER_SIZE)) {
571 dev_warn_ratelimited(cd->dev,
572 "touch head checksum error: %*ph\n",
573 (int)GOODIX_BERLIN_HEADER_SIZE,
574 &cd->event.hdr);
575 goto out_clear;
576 }
577
578 if (cd->event.hdr.status & GOODIX_BERLIN_TOUCH_EVENT)
579 goodix_berlin_touch_handler(cd);
580
581 if (cd->event.hdr.status & GOODIX_BERLIN_REQUEST_EVENT) {
582 switch (cd->event.hdr.request_type) {
583 case GOODIX_BERLIN_REQUEST_CODE_RESET:
584 if (cd->reset_gpio)
585 goodix_berlin_request_handle_reset(cd);
586 break;
587
588 default:
589 dev_warn(cd->dev, "unsupported request code 0x%x\n",
590 cd->event.hdr.request_type);
591 }
592 }
593
594
595out_clear:
596 /* Clear up status field */
597 regmap_write(cd->regmap, cd->touch_data_addr, 0);
598
599out:
600 return IRQ_HANDLED;
601}
602
603static int goodix_berlin_input_dev_config(struct goodix_berlin_core *cd,
604 const struct input_id *id)
605{
606 struct input_dev *input_dev;
607 int error;
608
609 input_dev = devm_input_allocate_device(cd->dev);
610 if (!input_dev)
611 return -ENOMEM;
612
613 cd->input_dev = input_dev;
614 input_set_drvdata(input_dev, cd);
615
616 input_dev->name = "Goodix Berlin Capacitive TouchScreen";
617 input_dev->phys = "input/ts";
618
619 input_dev->id = *id;
620
621 input_set_abs_params(cd->input_dev, ABS_MT_POSITION_X,
622 0, SZ_64K - 1, 0, 0);
623 input_set_abs_params(cd->input_dev, ABS_MT_POSITION_Y,
624 0, SZ_64K - 1, 0, 0);
625 input_set_abs_params(cd->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
626
627 touchscreen_parse_properties(cd->input_dev, true, &cd->props);
628
629 error = input_mt_init_slots(cd->input_dev, GOODIX_BERLIN_MAX_TOUCH,
630 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
631 if (error)
632 return error;
633
634 error = input_register_device(cd->input_dev);
635 if (error)
636 return error;
637
638 return 0;
639}
640
641static int goodix_berlin_suspend(struct device *dev)
642{
643 struct goodix_berlin_core *cd = dev_get_drvdata(dev);
644
645 disable_irq(cd->irq);
646 goodix_berlin_power_off(cd);
647
648 return 0;
649}
650
651static int goodix_berlin_resume(struct device *dev)
652{
653 struct goodix_berlin_core *cd = dev_get_drvdata(dev);
654 int error;
655
656 error = goodix_berlin_power_on(cd);
657 if (error)
658 return error;
659
660 enable_irq(cd->irq);
661
662 return 0;
663}
664
665EXPORT_GPL_SIMPLE_DEV_PM_OPS(goodix_berlin_pm_ops,
666 goodix_berlin_suspend, goodix_berlin_resume);
667
668static void goodix_berlin_power_off_act(void *data)
669{
670 struct goodix_berlin_core *cd = data;
671
672 goodix_berlin_power_off(cd);
673}
674
675static ssize_t registers_read(struct file *filp, struct kobject *kobj,
676 struct bin_attribute *bin_attr,
677 char *buf, loff_t off, size_t count)
678{
679 struct device *dev = kobj_to_dev(kobj);
680 struct goodix_berlin_core *cd = dev_get_drvdata(dev);
681 int error;
682
683 error = regmap_raw_read(cd->regmap, off, buf, count);
684
685 return error ? error : count;
686}
687
688static ssize_t registers_write(struct file *filp, struct kobject *kobj,
689 struct bin_attribute *bin_attr,
690 char *buf, loff_t off, size_t count)
691{
692 struct device *dev = kobj_to_dev(kobj);
693 struct goodix_berlin_core *cd = dev_get_drvdata(dev);
694 int error;
695
696 error = regmap_raw_write(cd->regmap, off, buf, count);
697
698 return error ? error : count;
699}
700
701static BIN_ATTR_ADMIN_RW(registers, 0);
702
703static struct bin_attribute *goodix_berlin_bin_attrs[] = {
704 &bin_attr_registers,
705 NULL,
706};
707
708static const struct attribute_group goodix_berlin_attr_group = {
709 .bin_attrs = goodix_berlin_bin_attrs,
710};
711
712const struct attribute_group *goodix_berlin_groups[] = {
713 &goodix_berlin_attr_group,
714 NULL,
715};
716EXPORT_SYMBOL_GPL(goodix_berlin_groups);
717
718int goodix_berlin_probe(struct device *dev, int irq, const struct input_id *id,
719 struct regmap *regmap)
720{
721 struct goodix_berlin_core *cd;
722 int error;
723
724 if (irq <= 0) {
725 dev_err(dev, "Missing interrupt number\n");
726 return -EINVAL;
727 }
728
729 cd = devm_kzalloc(dev, sizeof(*cd), GFP_KERNEL);
730 if (!cd)
731 return -ENOMEM;
732
733 cd->dev = dev;
734 cd->regmap = regmap;
735 cd->irq = irq;
736
737 cd->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
738 if (IS_ERR(cd->reset_gpio))
739 return dev_err_probe(dev, PTR_ERR(cd->reset_gpio),
740 "Failed to request reset gpio\n");
741
742 cd->avdd = devm_regulator_get(dev, "avdd");
743 if (IS_ERR(cd->avdd))
744 return dev_err_probe(dev, PTR_ERR(cd->avdd),
745 "Failed to request avdd regulator\n");
746
747 cd->iovdd = devm_regulator_get(dev, "iovdd");
748 if (IS_ERR(cd->iovdd))
749 return dev_err_probe(dev, PTR_ERR(cd->iovdd),
750 "Failed to request iovdd regulator\n");
751
752 error = goodix_berlin_power_on(cd);
753 if (error) {
754 dev_err(dev, "failed power on");
755 return error;
756 }
757
758 error = devm_add_action_or_reset(dev, goodix_berlin_power_off_act, cd);
759 if (error)
760 return error;
761
762 error = goodix_berlin_read_version(cd);
763 if (error) {
764 dev_err(dev, "failed to get version info");
765 return error;
766 }
767
768 error = goodix_berlin_get_ic_info(cd);
769 if (error) {
770 dev_err(dev, "invalid ic info, abort");
771 return error;
772 }
773
774 error = goodix_berlin_input_dev_config(cd, id);
775 if (error) {
776 dev_err(dev, "failed set input device");
777 return error;
778 }
779
780 error = devm_request_threaded_irq(dev, cd->irq, NULL, goodix_berlin_irq,
781 IRQF_ONESHOT, "goodix-berlin", cd);
782 if (error) {
783 dev_err(dev, "request threaded irq failed: %d\n", error);
784 return error;
785 }
786
787 dev_set_drvdata(dev, cd);
788
789 dev_dbg(dev, "Goodix Berlin %s Touchscreen Controller",
790 cd->fw_version.patch_pid);
791
792 return 0;
793}
794EXPORT_SYMBOL_GPL(goodix_berlin_probe);
795
796MODULE_LICENSE("GPL");
797MODULE_DESCRIPTION("Goodix Berlin Core Touchscreen driver");
798MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>");