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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / input / touchscreen / raydium_i2c_ts.c
blob6ed9f22e6401d9ba83ee76f42fce69665cef4346
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Raydium touchscreen I2C driver.
4 *
5 * Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
6 *
7 * Raydium reserves the right to make changes without further notice
8 * to the materials described herein. Raydium does not assume any
9 * liability arising out of the application described herein.
10 *
11 * Contact Raydium Semiconductor Corporation at www.rad-ic.com
12 */
13
14 #include <linux/acpi.h>
15 #include <linux/delay.h>
16 #include <linux/firmware.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/i2c.h>
19 #include <linux/input.h>
20 #include <linux/input/mt.h>
21 #include <linux/interrupt.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/slab.h>
26 #include <asm/unaligned.h>
27
28 /* Slave I2C mode */
29 #define RM_BOOT_BLDR 0x02
30 #define RM_BOOT_MAIN 0x03
31
32 /* I2C bootoloader commands */
33 #define RM_CMD_BOOT_PAGE_WRT 0x0B /* send bl page write */
34 #define RM_CMD_BOOT_WRT 0x11 /* send bl write */
35 #define RM_CMD_BOOT_ACK 0x22 /* send ack*/
36 #define RM_CMD_BOOT_CHK 0x33 /* send data check */
37 #define RM_CMD_BOOT_READ 0x44 /* send wait bl data ready*/
38
39 #define RM_BOOT_RDY 0xFF /* bl data ready */
40
41 /* I2C main commands */
42 #define RM_CMD_QUERY_BANK 0x2B
43 #define RM_CMD_DATA_BANK 0x4D
44 #define RM_CMD_ENTER_SLEEP 0x4E
45 #define RM_CMD_BANK_SWITCH 0xAA
46
47 #define RM_RESET_MSG_ADDR 0x40000004
48
49 #define RM_MAX_READ_SIZE 56
50 #define RM_PACKET_CRC_SIZE 2
51
52 /* Touch relative info */
53 #define RM_MAX_RETRIES 3
54 #define RM_MAX_TOUCH_NUM 10
55 #define RM_BOOT_DELAY_MS 100
56
57 /* Offsets in contact data */
58 #define RM_CONTACT_STATE_POS 0
59 #define RM_CONTACT_X_POS 1
60 #define RM_CONTACT_Y_POS 3
61 #define RM_CONTACT_PRESSURE_POS 5
62 #define RM_CONTACT_WIDTH_X_POS 6
63 #define RM_CONTACT_WIDTH_Y_POS 7
64
65 /* Bootloader relative info */
66 #define RM_BL_WRT_CMD_SIZE 3 /* bl flash wrt cmd size */
67 #define RM_BL_WRT_PKG_SIZE 32 /* bl wrt pkg size */
68 #define RM_BL_WRT_LEN (RM_BL_WRT_PKG_SIZE + RM_BL_WRT_CMD_SIZE)
69 #define RM_FW_PAGE_SIZE 128
70 #define RM_MAX_FW_RETRIES 30
71 #define RM_MAX_FW_SIZE 0xD000
72
73 #define RM_POWERON_DELAY_USEC 500
74 #define RM_RESET_DELAY_MSEC 50
75
76 enum raydium_bl_cmd {
77 BL_HEADER = 0,
78 BL_PAGE_STR,
79 BL_PKG_IDX,
80 BL_DATA_STR,
81 };
82
83 enum raydium_bl_ack {
84 RAYDIUM_ACK_NULL = 0,
85 RAYDIUM_WAIT_READY,
86 RAYDIUM_PATH_READY,
87 };
88
89 enum raydium_boot_mode {
90 RAYDIUM_TS_MAIN = 0,
91 RAYDIUM_TS_BLDR,
92 };
93
94 /* Response to RM_CMD_DATA_BANK request */
95 struct raydium_data_info {
96 __le32 data_bank_addr;
97 u8 pkg_size;
98 u8 tp_info_size;
99 };
100
101 struct raydium_info {
102 __le32 hw_ver; /*device version */
103 u8 main_ver;
104 u8 sub_ver;
105 __le16 ft_ver; /* test version */
106 u8 x_num;
107 u8 y_num;
108 __le16 x_max;
109 __le16 y_max;
110 u8 x_res; /* units/mm */
111 u8 y_res; /* units/mm */
112 };
113
114 /* struct raydium_data - represents state of Raydium touchscreen device */
115 struct raydium_data {
116 struct i2c_client *client;
117 struct input_dev *input;
118
119 struct regulator *avdd;
120 struct regulator *vccio;
121 struct gpio_desc *reset_gpio;
122
123 struct raydium_info info;
124
125 struct mutex sysfs_mutex;
126
127 u8 *report_data;
128
129 u32 data_bank_addr;
130 u8 report_size;
131 u8 contact_size;
132 u8 pkg_size;
133
134 enum raydium_boot_mode boot_mode;
135
136 bool wake_irq_enabled;
137 };
138
139 static int raydium_i2c_send(struct i2c_client *client,
140 u8 addr, const void *data, size_t len)
141 {
142 u8 *buf;
143 int tries = 0;
144 int ret;
145
146 buf = kmalloc(len + 1, GFP_KERNEL);
147 if (!buf)
148 return -ENOMEM;
149
150 buf[0] = addr;
151 memcpy(buf + 1, data, len);
152
153 do {
154 ret = i2c_master_send(client, buf, len + 1);
155 if (likely(ret == len + 1))
156 break;
157
158 msleep(20);
159 } while (++tries < RM_MAX_RETRIES);
160
161 kfree(buf);
162
163 if (unlikely(ret != len + 1)) {
164 if (ret >= 0)
165 ret = -EIO;
166 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
167 return ret;
168 }
169
170 return 0;
171 }
172
173 static int raydium_i2c_read(struct i2c_client *client,
174 u8 addr, void *data, size_t len)
175 {
176 struct i2c_msg xfer[] = {
177 {
178 .addr = client->addr,
179 .len = 1,
180 .buf = &addr,
181 },
182 {
183 .addr = client->addr,
184 .flags = I2C_M_RD,
185 .len = len,
186 .buf = data,
187 }
188 };
189 int ret;
190
191 ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
192 if (unlikely(ret != ARRAY_SIZE(xfer)))
193 return ret < 0 ? ret : -EIO;
194
195 return 0;
196 }
197
198 static int raydium_i2c_read_message(struct i2c_client *client,
199 u32 addr, void *data, size_t len)
200 {
201 __be32 be_addr;
202 size_t xfer_len;
203 int error;
204
205 while (len) {
206 xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
207
208 be_addr = cpu_to_be32(addr);
209
210 error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
211 &be_addr, sizeof(be_addr));
212 if (!error)
213 error = raydium_i2c_read(client, addr & 0xff,
214 data, xfer_len);
215 if (error)
216 return error;
217
218 len -= xfer_len;
219 data += xfer_len;
220 addr += xfer_len;
221 }
222
223 return 0;
224 }
225
226 static int raydium_i2c_send_message(struct i2c_client *client,
227 u32 addr, const void *data, size_t len)
228 {
229 __be32 be_addr = cpu_to_be32(addr);
230 int error;
231
232 error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
233 &be_addr, sizeof(be_addr));
234 if (!error)
235 error = raydium_i2c_send(client, addr & 0xff, data, len);
236
237 return error;
238 }
239
240 static int raydium_i2c_sw_reset(struct i2c_client *client)
241 {
242 const u8 soft_rst_cmd = 0x01;
243 int error;
244
245 error = raydium_i2c_send_message(client, RM_RESET_MSG_ADDR,
246 &soft_rst_cmd, sizeof(soft_rst_cmd));
247 if (error) {
248 dev_err(&client->dev, "software reset failed: %d\n", error);
249 return error;
250 }
251
252 msleep(RM_RESET_DELAY_MSEC);
253
254 return 0;
255 }
256
257 static int raydium_i2c_query_ts_info(struct raydium_data *ts)
258 {
259 struct i2c_client *client = ts->client;
260 struct raydium_data_info data_info;
261 __le32 query_bank_addr;
262
263 int error, retry_cnt;
264
265 for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
266 error = raydium_i2c_read(client, RM_CMD_DATA_BANK,
267 &data_info, sizeof(data_info));
268 if (error)
269 continue;
270
271 /*
272 * Warn user if we already allocated memory for reports and
273 * then the size changed (due to firmware update?) and keep
274 * old size instead.
275 */
276 if (ts->report_data && ts->pkg_size != data_info.pkg_size) {
277 dev_warn(&client->dev,
278 "report size changes, was: %d, new: %d\n",
279 ts->pkg_size, data_info.pkg_size);
280 } else {
281 ts->pkg_size = data_info.pkg_size;
282 ts->report_size = ts->pkg_size - RM_PACKET_CRC_SIZE;
283 }
284
285 ts->contact_size = data_info.tp_info_size;
286 ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
287
288 dev_dbg(&client->dev,
289 "data_bank_addr: %#08x, report_size: %d, contact_size: %d\n",
290 ts->data_bank_addr, ts->report_size, ts->contact_size);
291
292 error = raydium_i2c_read(client, RM_CMD_QUERY_BANK,
293 &query_bank_addr,
294 sizeof(query_bank_addr));
295 if (error)
296 continue;
297
298 error = raydium_i2c_read_message(client,
299 le32_to_cpu(query_bank_addr),
300 &ts->info, sizeof(ts->info));
301 if (error)
302 continue;
303
304 return 0;
305 }
306
307 dev_err(&client->dev, "failed to query device parameters: %d\n", error);
308 return error;
309 }
310
311 static int raydium_i2c_check_fw_status(struct raydium_data *ts)
312 {
313 struct i2c_client *client = ts->client;
314 static const u8 bl_ack = 0x62;
315 static const u8 main_ack = 0x66;
316 u8 buf[4];
317 int error;
318
319 error = raydium_i2c_read(client, RM_CMD_BOOT_READ, buf, sizeof(buf));
320 if (!error) {
321 if (buf[0] == bl_ack)
322 ts->boot_mode = RAYDIUM_TS_BLDR;
323 else if (buf[0] == main_ack)
324 ts->boot_mode = RAYDIUM_TS_MAIN;
325 return 0;
326 }
327
328 return error;
329 }
330
331 static int raydium_i2c_initialize(struct raydium_data *ts)
332 {
333 struct i2c_client *client = ts->client;
334 int error, retry_cnt;
335
336 for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
337 /* Wait for Hello packet */
338 msleep(RM_BOOT_DELAY_MS);
339
340 error = raydium_i2c_check_fw_status(ts);
341 if (error) {
342 dev_err(&client->dev,
343 "failed to read 'hello' packet: %d\n", error);
344 continue;
345 }
346
347 if (ts->boot_mode == RAYDIUM_TS_BLDR ||
348 ts->boot_mode == RAYDIUM_TS_MAIN) {
349 break;
350 }
351 }
352
353 if (error)
354 ts->boot_mode = RAYDIUM_TS_BLDR;
355
356 if (ts->boot_mode == RAYDIUM_TS_BLDR) {
357 ts->info.hw_ver = cpu_to_le32(0xffffffffUL);
358 ts->info.main_ver = 0xff;
359 ts->info.sub_ver = 0xff;
360 } else {
361 raydium_i2c_query_ts_info(ts);
362 }
363
364 return error;
365 }
366
367 static int raydium_i2c_bl_chk_state(struct i2c_client *client,
368 enum raydium_bl_ack state)
369 {
370 static const u8 ack_ok[] = { 0xFF, 0x39, 0x30, 0x30, 0x54 };
371 u8 rbuf[sizeof(ack_ok)];
372 u8 retry;
373 int error;
374
375 for (retry = 0; retry < RM_MAX_FW_RETRIES; retry++) {
376 switch (state) {
377 case RAYDIUM_ACK_NULL:
378 return 0;
379
380 case RAYDIUM_WAIT_READY:
381 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
382 &rbuf[0], 1);
383 if (!error && rbuf[0] == RM_BOOT_RDY)
384 return 0;
385
386 break;
387
388 case RAYDIUM_PATH_READY:
389 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
390 rbuf, sizeof(rbuf));
391 if (!error && !memcmp(rbuf, ack_ok, sizeof(ack_ok)))
392 return 0;
393
394 break;
395
396 default:
397 dev_err(&client->dev, "%s: invalid target state %d\n",
398 __func__, state);
399 return -EINVAL;
400 }
401
402 msleep(20);
403 }
404
405 return -ETIMEDOUT;
406 }
407
408 static int raydium_i2c_write_object(struct i2c_client *client,
409 const void *data, size_t len,
410 enum raydium_bl_ack state)
411 {
412 int error;
413
414 error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
415 if (error) {
416 dev_err(&client->dev, "WRT obj command failed: %d\n",
417 error);
418 return error;
419 }
420
421 error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, NULL, 0);
422 if (error) {
423 dev_err(&client->dev, "Ack obj command failed: %d\n", error);
424 return error;
425 }
426
427 error = raydium_i2c_bl_chk_state(client, state);
428 if (error) {
429 dev_err(&client->dev, "BL check state failed: %d\n", error);
430 return error;
431 }
432 return 0;
433 }
434
435 static bool raydium_i2c_boot_trigger(struct i2c_client *client)
436 {
437 static const u8 cmd[7][6] = {
438 { 0x08, 0x0C, 0x09, 0x00, 0x50, 0xD7 },
439 { 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
440 { 0x08, 0x04, 0x09, 0x00, 0x50, 0x00 },
441 { 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
442 { 0x08, 0x0C, 0x09, 0x00, 0x50, 0x00 },
443 { 0x06, 0x01, 0x00, 0x00, 0x00, 0x00 },
444 { 0x02, 0xA2, 0x00, 0x00, 0x00, 0x00 },
445 };
446 int i;
447 int error;
448
449 for (i = 0; i < 7; i++) {
450 error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
451 RAYDIUM_WAIT_READY);
452 if (error) {
453 dev_err(&client->dev,
454 "boot trigger failed at step %d: %d\n",
455 i, error);
456 return error;
457 }
458 }
459
460 return false;
461 }
462
463 static bool raydium_i2c_fw_trigger(struct i2c_client *client)
464 {
465 static const u8 cmd[5][11] = {
466 { 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0xD7, 0, 0, 0 },
467 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
468 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
469 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
470 { 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
471 };
472 int i;
473 int error;
474
475 for (i = 0; i < 5; i++) {
476 error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
477 RAYDIUM_ACK_NULL);
478 if (error) {
479 dev_err(&client->dev,
480 "fw trigger failed at step %d: %d\n",
481 i, error);
482 return error;
483 }
484 }
485
486 return false;
487 }
488
489 static int raydium_i2c_check_path(struct i2c_client *client)
490 {
491 static const u8 cmd[] = { 0x09, 0x00, 0x09, 0x00, 0x50, 0x10, 0x00 };
492 int error;
493
494 error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
495 RAYDIUM_PATH_READY);
496 if (error) {
497 dev_err(&client->dev, "check path command failed: %d\n", error);
498 return error;
499 }
500
501 return 0;
502 }
503
504 static int raydium_i2c_enter_bl(struct i2c_client *client)
505 {
506 static const u8 cal_cmd[] = { 0x00, 0x01, 0x52 };
507 int error;
508
509 error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
510 RAYDIUM_ACK_NULL);
511 if (error) {
512 dev_err(&client->dev, "enter bl command failed: %d\n", error);
513 return error;
514 }
515
516 msleep(RM_BOOT_DELAY_MS);
517 return 0;
518 }
519
520 static int raydium_i2c_leave_bl(struct i2c_client *client)
521 {
522 static const u8 leave_cmd[] = { 0x05, 0x00 };
523 int error;
524
525 error = raydium_i2c_write_object(client, leave_cmd, sizeof(leave_cmd),
526 RAYDIUM_ACK_NULL);
527 if (error) {
528 dev_err(&client->dev, "leave bl command failed: %d\n", error);
529 return error;
530 }
531
532 msleep(RM_BOOT_DELAY_MS);
533 return 0;
534 }
535
536 static int raydium_i2c_write_checksum(struct i2c_client *client,
537 size_t length, u16 checksum)
538 {
539 u8 checksum_cmd[] = { 0x00, 0x05, 0x6D, 0x00, 0x00, 0x00, 0x00 };
540 int error;
541
542 put_unaligned_le16(length, &checksum_cmd[3]);
543 put_unaligned_le16(checksum, &checksum_cmd[5]);
544
545 error = raydium_i2c_write_object(client,
546 checksum_cmd, sizeof(checksum_cmd),
547 RAYDIUM_ACK_NULL);
548 if (error) {
549 dev_err(&client->dev, "failed to write checksum: %d\n",
550 error);
551 return error;
552 }
553
554 return 0;
555 }
556
557 static int raydium_i2c_disable_watch_dog(struct i2c_client *client)
558 {
559 static const u8 cmd[] = { 0x0A, 0xAA };
560 int error;
561
562 error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
563 RAYDIUM_WAIT_READY);
564 if (error) {
565 dev_err(&client->dev, "disable watchdog command failed: %d\n",
566 error);
567 return error;
568 }
569
570 return 0;
571 }
572
573 static int raydium_i2c_fw_write_page(struct i2c_client *client,
574 u16 page_idx, const void *data, size_t len)
575 {
576 u8 buf[RM_BL_WRT_LEN];
577 size_t xfer_len;
578 int error;
579 int i;
580
581 BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
582
583 for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
584 buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
585 buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
586 buf[BL_PKG_IDX] = i + 1;
587
588 xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
589 memcpy(&buf[BL_DATA_STR], data, xfer_len);
590 if (len < RM_BL_WRT_PKG_SIZE)
591 memset(&buf[BL_DATA_STR + xfer_len], 0xff,
592 RM_BL_WRT_PKG_SIZE - xfer_len);
593
594 error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
595 RAYDIUM_WAIT_READY);
596 if (error) {
597 dev_err(&client->dev,
598 "page write command failed for page %d, chunk %d: %d\n",
599 page_idx, i, error);
600 return error;
601 }
602
603 data += xfer_len;
604 len -= xfer_len;
605 }
606
607 return error;
608 }
609
610 static u16 raydium_calc_chksum(const u8 *buf, u16 len)
611 {
612 u16 checksum = 0;
613 u16 i;
614
615 for (i = 0; i < len; i++)
616 checksum += buf[i];
617
618 return checksum;
619 }
620
621 static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
622 const struct firmware *fw)
623 {
624 struct i2c_client *client = ts->client;
625 const void *data;
626 size_t data_len;
627 size_t len;
628 int page_nr;
629 int i;
630 int error;
631 u16 fw_checksum;
632
633 if (fw->size == 0 || fw->size > RM_MAX_FW_SIZE) {
634 dev_err(&client->dev, "Invalid firmware length\n");
635 return -EINVAL;
636 }
637
638 error = raydium_i2c_check_fw_status(ts);
639 if (error) {
640 dev_err(&client->dev, "Unable to access IC %d\n", error);
641 return error;
642 }
643
644 if (ts->boot_mode == RAYDIUM_TS_MAIN) {
645 for (i = 0; i < RM_MAX_RETRIES; i++) {
646 error = raydium_i2c_enter_bl(client);
647 if (!error) {
648 error = raydium_i2c_check_fw_status(ts);
649 if (error) {
650 dev_err(&client->dev,
651 "unable to access IC: %d\n",
652 error);
653 return error;
654 }
655
656 if (ts->boot_mode == RAYDIUM_TS_BLDR)
657 break;
658 }
659 }
660
661 if (ts->boot_mode == RAYDIUM_TS_MAIN) {
662 dev_err(&client->dev,
663 "failed to jump to boot loader: %d\n",
664 error);
665 return -EIO;
666 }
667 }
668
669 error = raydium_i2c_disable_watch_dog(client);
670 if (error)
671 return error;
672
673 error = raydium_i2c_check_path(client);
674 if (error)
675 return error;
676
677 error = raydium_i2c_boot_trigger(client);
678 if (error) {
679 dev_err(&client->dev, "send boot trigger fail: %d\n", error);
680 return error;
681 }
682
683 msleep(RM_BOOT_DELAY_MS);
684
685 data = fw->data;
686 data_len = fw->size;
687 page_nr = 0;
688
689 while (data_len) {
690 len = min_t(size_t, data_len, RM_FW_PAGE_SIZE);
691
692 error = raydium_i2c_fw_write_page(client, page_nr++, data, len);
693 if (error)
694 return error;
695
696 msleep(20);
697
698 data += len;
699 data_len -= len;
700 }
701
702 error = raydium_i2c_leave_bl(client);
703 if (error) {
704 dev_err(&client->dev,
705 "failed to leave boot loader: %d\n", error);
706 return error;
707 }
708
709 dev_dbg(&client->dev, "left boot loader mode\n");
710 msleep(RM_BOOT_DELAY_MS);
711
712 error = raydium_i2c_check_fw_status(ts);
713 if (error) {
714 dev_err(&client->dev,
715 "failed to check fw status after write: %d\n",
716 error);
717 return error;
718 }
719
720 if (ts->boot_mode != RAYDIUM_TS_MAIN) {
721 dev_err(&client->dev,
722 "failed to switch to main fw after writing firmware: %d\n",
723 error);
724 return -EINVAL;
725 }
726
727 error = raydium_i2c_fw_trigger(client);
728 if (error) {
729 dev_err(&client->dev, "failed to trigger fw: %d\n", error);
730 return error;
731 }
732
733 fw_checksum = raydium_calc_chksum(fw->data, fw->size);
734
735 error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
736 if (error)
737 return error;
738
739 return 0;
740 }
741
742 static int raydium_i2c_fw_update(struct raydium_data *ts)
743 {
744 struct i2c_client *client = ts->client;
745 const struct firmware *fw = NULL;
746 char *fw_file;
747 int error;
748
749 fw_file = kasprintf(GFP_KERNEL, "raydium_%#04x.fw",
750 le32_to_cpu(ts->info.hw_ver));
751 if (!fw_file)
752 return -ENOMEM;
753
754 dev_dbg(&client->dev, "firmware name: %s\n", fw_file);
755
756 error = request_firmware(&fw, fw_file, &client->dev);
757 if (error) {
758 dev_err(&client->dev, "Unable to open firmware %s\n", fw_file);
759 goto out_free_fw_file;
760 }
761
762 disable_irq(client->irq);
763
764 error = raydium_i2c_do_update_firmware(ts, fw);
765 if (error) {
766 dev_err(&client->dev, "firmware update failed: %d\n", error);
767 ts->boot_mode = RAYDIUM_TS_BLDR;
768 goto out_enable_irq;
769 }
770
771 error = raydium_i2c_initialize(ts);
772 if (error) {
773 dev_err(&client->dev,
774 "failed to initialize device after firmware update: %d\n",
775 error);
776 ts->boot_mode = RAYDIUM_TS_BLDR;
777 goto out_enable_irq;
778 }
779
780 ts->boot_mode = RAYDIUM_TS_MAIN;
781
782 out_enable_irq:
783 enable_irq(client->irq);
784 msleep(100);
785
786 release_firmware(fw);
787
788 out_free_fw_file:
789 kfree(fw_file);
790
791 return error;
792 }
793
794 static void raydium_mt_event(struct raydium_data *ts)
795 {
796 int i;
797
798 for (i = 0; i < ts->report_size / ts->contact_size; i++) {
799 u8 *contact = &ts->report_data[ts->contact_size * i];
800 bool state = contact[RM_CONTACT_STATE_POS];
801 u8 wx, wy;
802
803 input_mt_slot(ts->input, i);
804 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);
805
806 if (!state)
807 continue;
808
809 input_report_abs(ts->input, ABS_MT_POSITION_X,
810 get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
811 input_report_abs(ts->input, ABS_MT_POSITION_Y,
812 get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
813 input_report_abs(ts->input, ABS_MT_PRESSURE,
814 contact[RM_CONTACT_PRESSURE_POS]);
815
816 wx = contact[RM_CONTACT_WIDTH_X_POS];
817 wy = contact[RM_CONTACT_WIDTH_Y_POS];
818
819 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
820 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
821 }
822
823 input_mt_sync_frame(ts->input);
824 input_sync(ts->input);
825 }
826
827 static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
828 {
829 struct raydium_data *ts = _dev;
830 int error;
831 u16 fw_crc;
832 u16 calc_crc;
833
834 if (ts->boot_mode != RAYDIUM_TS_MAIN)
835 goto out;
836
837 error = raydium_i2c_read_message(ts->client, ts->data_bank_addr,
838 ts->report_data, ts->pkg_size);
839 if (error)
840 goto out;
841
842 fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
843 calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
844 if (unlikely(fw_crc != calc_crc)) {
845 dev_warn(&ts->client->dev,
846 "%s: invalid packet crc %#04x vs %#04x\n",
847 __func__, calc_crc, fw_crc);
848 goto out;
849 }
850
851 raydium_mt_event(ts);
852
853 out:
854 return IRQ_HANDLED;
855 }
856
857 static ssize_t raydium_i2c_fw_ver_show(struct device *dev,
858 struct device_attribute *attr, char *buf)
859 {
860 struct i2c_client *client = to_i2c_client(dev);
861 struct raydium_data *ts = i2c_get_clientdata(client);
862
863 return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
864 }
865
866 static ssize_t raydium_i2c_hw_ver_show(struct device *dev,
867 struct device_attribute *attr, char *buf)
868 {
869 struct i2c_client *client = to_i2c_client(dev);
870 struct raydium_data *ts = i2c_get_clientdata(client);
871
872 return sprintf(buf, "%#04x\n", le32_to_cpu(ts->info.hw_ver));
873 }
874
875 static ssize_t raydium_i2c_boot_mode_show(struct device *dev,
876 struct device_attribute *attr,
877 char *buf)
878 {
879 struct i2c_client *client = to_i2c_client(dev);
880 struct raydium_data *ts = i2c_get_clientdata(client);
881
882 return sprintf(buf, "%s\n",
883 ts->boot_mode == RAYDIUM_TS_MAIN ?
884 "Normal" : "Recovery");
885 }
886
887 static ssize_t raydium_i2c_update_fw_store(struct device *dev,
888 struct device_attribute *attr,
889 const char *buf, size_t count)
890 {
891 struct i2c_client *client = to_i2c_client(dev);
892 struct raydium_data *ts = i2c_get_clientdata(client);
893 int error;
894
895 error = mutex_lock_interruptible(&ts->sysfs_mutex);
896 if (error)
897 return error;
898
899 error = raydium_i2c_fw_update(ts);
900
901 mutex_unlock(&ts->sysfs_mutex);
902
903 return error ?: count;
904 }
905
906 static ssize_t raydium_i2c_calibrate_store(struct device *dev,
907 struct device_attribute *attr,
908 const char *buf, size_t count)
909 {
910 struct i2c_client *client = to_i2c_client(dev);
911 struct raydium_data *ts = i2c_get_clientdata(client);
912 static const u8 cal_cmd[] = { 0x00, 0x01, 0x9E };
913 int error;
914
915 error = mutex_lock_interruptible(&ts->sysfs_mutex);
916 if (error)
917 return error;
918
919 error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
920 RAYDIUM_WAIT_READY);
921 if (error)
922 dev_err(&client->dev, "calibrate command failed: %d\n", error);
923
924 mutex_unlock(&ts->sysfs_mutex);
925 return error ?: count;
926 }
927
928 static DEVICE_ATTR(fw_version, S_IRUGO, raydium_i2c_fw_ver_show, NULL);
929 static DEVICE_ATTR(hw_version, S_IRUGO, raydium_i2c_hw_ver_show, NULL);
930 static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_i2c_boot_mode_show, NULL);
931 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, raydium_i2c_update_fw_store);
932 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, raydium_i2c_calibrate_store);
933
934 static struct attribute *raydium_i2c_attributes[] = {
935 &dev_attr_update_fw.attr,
936 &dev_attr_boot_mode.attr,
937 &dev_attr_fw_version.attr,
938 &dev_attr_hw_version.attr,
939 &dev_attr_calibrate.attr,
940 NULL
941 };
942
943 static const struct attribute_group raydium_i2c_attribute_group = {
944 .attrs = raydium_i2c_attributes,
945 };
946
947 static int raydium_i2c_power_on(struct raydium_data *ts)
948 {
949 int error;
950
951 if (!ts->reset_gpio)
952 return 0;
953
954 gpiod_set_value_cansleep(ts->reset_gpio, 1);
955
956 error = regulator_enable(ts->avdd);
957 if (error) {
958 dev_err(&ts->client->dev,
959 "failed to enable avdd regulator: %d\n", error);
960 goto release_reset_gpio;
961 }
962
963 error = regulator_enable(ts->vccio);
964 if (error) {
965 regulator_disable(ts->avdd);
966 dev_err(&ts->client->dev,
967 "failed to enable vccio regulator: %d\n", error);
968 goto release_reset_gpio;
969 }
970
971 udelay(RM_POWERON_DELAY_USEC);
972
973 release_reset_gpio:
974 gpiod_set_value_cansleep(ts->reset_gpio, 0);
975
976 if (error)
977 return error;
978
979 msleep(RM_RESET_DELAY_MSEC);
980
981 return 0;
982 }
983
984 static void raydium_i2c_power_off(void *_data)
985 {
986 struct raydium_data *ts = _data;
987
988 if (ts->reset_gpio) {
989 gpiod_set_value_cansleep(ts->reset_gpio, 1);
990 regulator_disable(ts->vccio);
991 regulator_disable(ts->avdd);
992 }
993 }
994
995 static int raydium_i2c_probe(struct i2c_client *client,
996 const struct i2c_device_id *id)
997 {
998 union i2c_smbus_data dummy;
999 struct raydium_data *ts;
1000 int error;
1001
1002 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1003 dev_err(&client->dev,
1004 "i2c check functionality error (need I2C_FUNC_I2C)\n");
1005 return -ENXIO;
1006 }
1007
1008 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1009 if (!ts)
1010 return -ENOMEM;
1011
1012 mutex_init(&ts->sysfs_mutex);
1013
1014 ts->client = client;
1015 i2c_set_clientdata(client, ts);
1016
1017 ts->avdd = devm_regulator_get(&client->dev, "avdd");
1018 if (IS_ERR(ts->avdd)) {
1019 error = PTR_ERR(ts->avdd);
1020 if (error != -EPROBE_DEFER)
1021 dev_err(&client->dev,
1022 "Failed to get 'avdd' regulator: %d\n", error);
1023 return error;
1024 }
1025
1026 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1027 if (IS_ERR(ts->vccio)) {
1028 error = PTR_ERR(ts->vccio);
1029 if (error != -EPROBE_DEFER)
1030 dev_err(&client->dev,
1031 "Failed to get 'vccio' regulator: %d\n", error);
1032 return error;
1033 }
1034
1035 ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1036 GPIOD_OUT_LOW);
1037 if (IS_ERR(ts->reset_gpio)) {
1038 error = PTR_ERR(ts->reset_gpio);
1039 if (error != -EPROBE_DEFER)
1040 dev_err(&client->dev,
1041 "failed to get reset gpio: %d\n", error);
1042 return error;
1043 }
1044
1045 error = raydium_i2c_power_on(ts);
1046 if (error)
1047 return error;
1048
1049 error = devm_add_action(&client->dev, raydium_i2c_power_off, ts);
1050 if (error) {
1051 dev_err(&client->dev,
1052 "failed to install power off action: %d\n", error);
1053 raydium_i2c_power_off(ts);
1054 return error;
1055 }
1056
1057 /* Make sure there is something at this address */
1058 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1059 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1060 dev_err(&client->dev, "nothing at this address\n");
1061 return -ENXIO;
1062 }
1063
1064 error = raydium_i2c_initialize(ts);
1065 if (error) {
1066 dev_err(&client->dev, "failed to initialize: %d\n", error);
1067 return error;
1068 }
1069
1070 ts->report_data = devm_kmalloc(&client->dev,
1071 ts->pkg_size, GFP_KERNEL);
1072 if (!ts->report_data)
1073 return -ENOMEM;
1074
1075 ts->input = devm_input_allocate_device(&client->dev);
1076 if (!ts->input) {
1077 dev_err(&client->dev, "Failed to allocate input device\n");
1078 return -ENOMEM;
1079 }
1080
1081 ts->input->name = "Raydium Touchscreen";
1082 ts->input->id.bustype = BUS_I2C;
1083
1084 input_set_abs_params(ts->input, ABS_MT_POSITION_X,
1085 0, le16_to_cpu(ts->info.x_max), 0, 0);
1086 input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
1087 0, le16_to_cpu(ts->info.y_max), 0, 0);
1088 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
1089 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
1090
1091 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1092 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1093
1094 error = input_mt_init_slots(ts->input, RM_MAX_TOUCH_NUM,
1095 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1096 if (error) {
1097 dev_err(&client->dev,
1098 "failed to initialize MT slots: %d\n", error);
1099 return error;
1100 }
1101
1102 error = input_register_device(ts->input);
1103 if (error) {
1104 dev_err(&client->dev,
1105 "unable to register input device: %d\n", error);
1106 return error;
1107 }
1108
1109 error = devm_request_threaded_irq(&client->dev, client->irq,
1110 NULL, raydium_i2c_irq,
1111 IRQF_ONESHOT, client->name, ts);
1112 if (error) {
1113 dev_err(&client->dev, "Failed to register interrupt\n");
1114 return error;
1115 }
1116
1117 error = devm_device_add_group(&client->dev,
1118 &raydium_i2c_attribute_group);
1119 if (error) {
1120 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1121 error);
1122 return error;
1123 }
1124
1125 return 0;
1126 }
1127
1128 static void __maybe_unused raydium_enter_sleep(struct i2c_client *client)
1129 {
1130 static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
1131 int error;
1132
1133 error = raydium_i2c_send(client, RM_CMD_ENTER_SLEEP,
1134 sleep_cmd, sizeof(sleep_cmd));
1135 if (error)
1136 dev_err(&client->dev,
1137 "sleep command failed: %d\n", error);
1138 }
1139
1140 static int __maybe_unused raydium_i2c_suspend(struct device *dev)
1141 {
1142 struct i2c_client *client = to_i2c_client(dev);
1143 struct raydium_data *ts = i2c_get_clientdata(client);
1144
1145 /* Sleep is not available in BLDR recovery mode */
1146 if (ts->boot_mode != RAYDIUM_TS_MAIN)
1147 return -EBUSY;
1148
1149 disable_irq(client->irq);
1150
1151 if (device_may_wakeup(dev)) {
1152 raydium_enter_sleep(client);
1153
1154 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1155 } else {
1156 raydium_i2c_power_off(ts);
1157 }
1158
1159 return 0;
1160 }
1161
1162 static int __maybe_unused raydium_i2c_resume(struct device *dev)
1163 {
1164 struct i2c_client *client = to_i2c_client(dev);
1165 struct raydium_data *ts = i2c_get_clientdata(client);
1166
1167 if (device_may_wakeup(dev)) {
1168 if (ts->wake_irq_enabled)
1169 disable_irq_wake(client->irq);
1170 raydium_i2c_sw_reset(client);
1171 } else {
1172 raydium_i2c_power_on(ts);
1173 raydium_i2c_initialize(ts);
1174 }
1175
1176 enable_irq(client->irq);
1177
1178 return 0;
1179 }
1180
1181 static SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
1182 raydium_i2c_suspend, raydium_i2c_resume);
1183
1184 static const struct i2c_device_id raydium_i2c_id[] = {
1185 { "raydium_i2c" , 0 },
1186 { "rm32380", 0 },
1187 { /* sentinel */ }
1188 };
1189 MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
1190
1191 #ifdef CONFIG_ACPI
1192 static const struct acpi_device_id raydium_acpi_id[] = {
1193 { "RAYD0001", 0 },
1194 { /* sentinel */ }
1195 };
1196 MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
1197 #endif
1198
1199 #ifdef CONFIG_OF
1200 static const struct of_device_id raydium_of_match[] = {
1201 { .compatible = "raydium,rm32380", },
1202 { /* sentinel */ }
1203 };
1204 MODULE_DEVICE_TABLE(of, raydium_of_match);
1205 #endif
1206
1207 static struct i2c_driver raydium_i2c_driver = {
1208 .probe = raydium_i2c_probe,
1209 .id_table = raydium_i2c_id,
1210 .driver = {
1211 .name = "raydium_ts",
1212 .pm = &raydium_i2c_pm_ops,
1213 .acpi_match_table = ACPI_PTR(raydium_acpi_id),
1214 .of_match_table = of_match_ptr(raydium_of_match),
1215 },
1216 };
1217 module_i2c_driver(raydium_i2c_driver);
1218
1219 MODULE_AUTHOR("Raydium");
1220 MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
1221 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support