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spi: bcm2835: Fix controller unregister order
[linux/fpc-iii.git] / drivers / input / touchscreen / raydium_i2c_ts.c
blob1f5b6b5b1018ab69ea854de068c0b9b7cdfc33ba
1 /*
2 * Raydium touchscreen I2C driver.
3 *
4 * Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2, and only version 2, as published by the
9 * Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * Raydium reserves the right to make changes without further notice
17 * to the materials described herein. Raydium does not assume any
18 * liability arising out of the application described herein.
19 *
20 * Contact Raydium Semiconductor Corporation at www.rad-ic.com
21 */
22
23 #include <linux/acpi.h>
24 #include <linux/delay.h>
25 #include <linux/firmware.h>
26 #include <linux/gpio/consumer.h>
27 #include <linux/i2c.h>
28 #include <linux/input.h>
29 #include <linux/input/mt.h>
30 #include <linux/interrupt.h>
31 #include <linux/module.h>
32 #include <linux/of.h>
33 #include <linux/regulator/consumer.h>
34 #include <linux/slab.h>
35 #include <asm/unaligned.h>
36
37 /* Slave I2C mode */
38 #define RM_BOOT_BLDR 0x02
39 #define RM_BOOT_MAIN 0x03
40
41 /* I2C bootoloader commands */
42 #define RM_CMD_BOOT_PAGE_WRT 0x0B /* send bl page write */
43 #define RM_CMD_BOOT_WRT 0x11 /* send bl write */
44 #define RM_CMD_BOOT_ACK 0x22 /* send ack*/
45 #define RM_CMD_BOOT_CHK 0x33 /* send data check */
46 #define RM_CMD_BOOT_READ 0x44 /* send wait bl data ready*/
47
48 #define RM_BOOT_RDY 0xFF /* bl data ready */
49
50 /* I2C main commands */
51 #define RM_CMD_QUERY_BANK 0x2B
52 #define RM_CMD_DATA_BANK 0x4D
53 #define RM_CMD_ENTER_SLEEP 0x4E
54 #define RM_CMD_BANK_SWITCH 0xAA
55
56 #define RM_RESET_MSG_ADDR 0x40000004
57
58 #define RM_MAX_READ_SIZE 56
59 #define RM_PACKET_CRC_SIZE 2
60
61 /* Touch relative info */
62 #define RM_MAX_RETRIES 3
63 #define RM_MAX_TOUCH_NUM 10
64 #define RM_BOOT_DELAY_MS 100
65
66 /* Offsets in contact data */
67 #define RM_CONTACT_STATE_POS 0
68 #define RM_CONTACT_X_POS 1
69 #define RM_CONTACT_Y_POS 3
70 #define RM_CONTACT_PRESSURE_POS 5
71 #define RM_CONTACT_WIDTH_X_POS 6
72 #define RM_CONTACT_WIDTH_Y_POS 7
73
74 /* Bootloader relative info */
75 #define RM_BL_WRT_CMD_SIZE 3 /* bl flash wrt cmd size */
76 #define RM_BL_WRT_PKG_SIZE 32 /* bl wrt pkg size */
77 #define RM_BL_WRT_LEN (RM_BL_WRT_PKG_SIZE + RM_BL_WRT_CMD_SIZE)
78 #define RM_FW_PAGE_SIZE 128
79 #define RM_MAX_FW_RETRIES 30
80 #define RM_MAX_FW_SIZE 0xD000
81
82 #define RM_POWERON_DELAY_USEC 500
83 #define RM_RESET_DELAY_MSEC 50
84
85 enum raydium_bl_cmd {
86 BL_HEADER = 0,
87 BL_PAGE_STR,
88 BL_PKG_IDX,
89 BL_DATA_STR,
90 };
91
92 enum raydium_bl_ack {
93 RAYDIUM_ACK_NULL = 0,
94 RAYDIUM_WAIT_READY,
95 RAYDIUM_PATH_READY,
96 };
97
98 enum raydium_boot_mode {
99 RAYDIUM_TS_MAIN = 0,
100 RAYDIUM_TS_BLDR,
101 };
102
103 /* Response to RM_CMD_DATA_BANK request */
104 struct raydium_data_info {
105 __le32 data_bank_addr;
106 u8 pkg_size;
107 u8 tp_info_size;
108 };
109
110 struct raydium_info {
111 __le32 hw_ver; /*device version */
112 u8 main_ver;
113 u8 sub_ver;
114 __le16 ft_ver; /* test version */
115 u8 x_num;
116 u8 y_num;
117 __le16 x_max;
118 __le16 y_max;
119 u8 x_res; /* units/mm */
120 u8 y_res; /* units/mm */
121 };
122
123 /* struct raydium_data - represents state of Raydium touchscreen device */
124 struct raydium_data {
125 struct i2c_client *client;
126 struct input_dev *input;
127
128 struct regulator *avdd;
129 struct regulator *vccio;
130 struct gpio_desc *reset_gpio;
131
132 struct raydium_info info;
133
134 struct mutex sysfs_mutex;
135
136 u8 *report_data;
137
138 u32 data_bank_addr;
139 u8 report_size;
140 u8 contact_size;
141 u8 pkg_size;
142
143 enum raydium_boot_mode boot_mode;
144
145 bool wake_irq_enabled;
146 };
147
148 static int raydium_i2c_send(struct i2c_client *client,
149 u8 addr, const void *data, size_t len)
150 {
151 u8 *buf;
152 int tries = 0;
153 int ret;
154
155 buf = kmalloc(len + 1, GFP_KERNEL);
156 if (!buf)
157 return -ENOMEM;
158
159 buf[0] = addr;
160 memcpy(buf + 1, data, len);
161
162 do {
163 ret = i2c_master_send(client, buf, len + 1);
164 if (likely(ret == len + 1))
165 break;
166
167 msleep(20);
168 } while (++tries < RM_MAX_RETRIES);
169
170 kfree(buf);
171
172 if (unlikely(ret != len + 1)) {
173 if (ret >= 0)
174 ret = -EIO;
175 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
176 return ret;
177 }
178
179 return 0;
180 }
181
182 static int raydium_i2c_read(struct i2c_client *client,
183 u8 addr, void *data, size_t len)
184 {
185 struct i2c_msg xfer[] = {
186 {
187 .addr = client->addr,
188 .len = 1,
189 .buf = &addr,
190 },
191 {
192 .addr = client->addr,
193 .flags = I2C_M_RD,
194 .len = len,
195 .buf = data,
196 }
197 };
198 int ret;
199
200 ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
201 if (unlikely(ret != ARRAY_SIZE(xfer)))
202 return ret < 0 ? ret : -EIO;
203
204 return 0;
205 }
206
207 static int raydium_i2c_read_message(struct i2c_client *client,
208 u32 addr, void *data, size_t len)
209 {
210 __be32 be_addr;
211 size_t xfer_len;
212 int error;
213
214 while (len) {
215 xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
216
217 be_addr = cpu_to_be32(addr);
218
219 error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
220 &be_addr, sizeof(be_addr));
221 if (!error)
222 error = raydium_i2c_read(client, addr & 0xff,
223 data, xfer_len);
224 if (error)
225 return error;
226
227 len -= xfer_len;
228 data += xfer_len;
229 addr += xfer_len;
230 }
231
232 return 0;
233 }
234
235 static int raydium_i2c_send_message(struct i2c_client *client,
236 u32 addr, const void *data, size_t len)
237 {
238 __be32 be_addr = cpu_to_be32(addr);
239 int error;
240
241 error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
242 &be_addr, sizeof(be_addr));
243 if (!error)
244 error = raydium_i2c_send(client, addr & 0xff, data, len);
245
246 return error;
247 }
248
249 static int raydium_i2c_sw_reset(struct i2c_client *client)
250 {
251 const u8 soft_rst_cmd = 0x01;
252 int error;
253
254 error = raydium_i2c_send_message(client, RM_RESET_MSG_ADDR,
255 &soft_rst_cmd, sizeof(soft_rst_cmd));
256 if (error) {
257 dev_err(&client->dev, "software reset failed: %d\n", error);
258 return error;
259 }
260
261 msleep(RM_RESET_DELAY_MSEC);
262
263 return 0;
264 }
265
266 static int raydium_i2c_query_ts_info(struct raydium_data *ts)
267 {
268 struct i2c_client *client = ts->client;
269 struct raydium_data_info data_info;
270 __le32 query_bank_addr;
271
272 int error, retry_cnt;
273
274 for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
275 error = raydium_i2c_read(client, RM_CMD_DATA_BANK,
276 &data_info, sizeof(data_info));
277 if (error)
278 continue;
279
280 /*
281 * Warn user if we already allocated memory for reports and
282 * then the size changed (due to firmware update?) and keep
283 * old size instead.
284 */
285 if (ts->report_data && ts->pkg_size != data_info.pkg_size) {
286 dev_warn(&client->dev,
287 "report size changes, was: %d, new: %d\n",
288 ts->pkg_size, data_info.pkg_size);
289 } else {
290 ts->pkg_size = data_info.pkg_size;
291 ts->report_size = ts->pkg_size - RM_PACKET_CRC_SIZE;
292 }
293
294 ts->contact_size = data_info.tp_info_size;
295 ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
296
297 dev_dbg(&client->dev,
298 "data_bank_addr: %#08x, report_size: %d, contact_size: %d\n",
299 ts->data_bank_addr, ts->report_size, ts->contact_size);
300
301 error = raydium_i2c_read(client, RM_CMD_QUERY_BANK,
302 &query_bank_addr,
303 sizeof(query_bank_addr));
304 if (error)
305 continue;
306
307 error = raydium_i2c_read_message(client,
308 le32_to_cpu(query_bank_addr),
309 &ts->info, sizeof(ts->info));
310 if (error)
311 continue;
312
313 return 0;
314 }
315
316 dev_err(&client->dev, "failed to query device parameters: %d\n", error);
317 return error;
318 }
319
320 static int raydium_i2c_check_fw_status(struct raydium_data *ts)
321 {
322 struct i2c_client *client = ts->client;
323 static const u8 bl_ack = 0x62;
324 static const u8 main_ack = 0x66;
325 u8 buf[4];
326 int error;
327
328 error = raydium_i2c_read(client, RM_CMD_BOOT_READ, buf, sizeof(buf));
329 if (!error) {
330 if (buf[0] == bl_ack)
331 ts->boot_mode = RAYDIUM_TS_BLDR;
332 else if (buf[0] == main_ack)
333 ts->boot_mode = RAYDIUM_TS_MAIN;
334 return 0;
335 }
336
337 return error;
338 }
339
340 static int raydium_i2c_initialize(struct raydium_data *ts)
341 {
342 struct i2c_client *client = ts->client;
343 int error, retry_cnt;
344
345 for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
346 /* Wait for Hello packet */
347 msleep(RM_BOOT_DELAY_MS);
348
349 error = raydium_i2c_check_fw_status(ts);
350 if (error) {
351 dev_err(&client->dev,
352 "failed to read 'hello' packet: %d\n", error);
353 continue;
354 }
355
356 if (ts->boot_mode == RAYDIUM_TS_BLDR ||
357 ts->boot_mode == RAYDIUM_TS_MAIN) {
358 break;
359 }
360 }
361
362 if (error)
363 ts->boot_mode = RAYDIUM_TS_BLDR;
364
365 if (ts->boot_mode == RAYDIUM_TS_BLDR) {
366 ts->info.hw_ver = cpu_to_le32(0xffffffffUL);
367 ts->info.main_ver = 0xff;
368 ts->info.sub_ver = 0xff;
369 } else {
370 raydium_i2c_query_ts_info(ts);
371 }
372
373 return error;
374 }
375
376 static int raydium_i2c_bl_chk_state(struct i2c_client *client,
377 enum raydium_bl_ack state)
378 {
379 static const u8 ack_ok[] = { 0xFF, 0x39, 0x30, 0x30, 0x54 };
380 u8 rbuf[sizeof(ack_ok)];
381 u8 retry;
382 int error;
383
384 for (retry = 0; retry < RM_MAX_FW_RETRIES; retry++) {
385 switch (state) {
386 case RAYDIUM_ACK_NULL:
387 return 0;
388
389 case RAYDIUM_WAIT_READY:
390 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
391 &rbuf[0], 1);
392 if (!error && rbuf[0] == RM_BOOT_RDY)
393 return 0;
394
395 break;
396
397 case RAYDIUM_PATH_READY:
398 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
399 rbuf, sizeof(rbuf));
400 if (!error && !memcmp(rbuf, ack_ok, sizeof(ack_ok)))
401 return 0;
402
403 break;
404
405 default:
406 dev_err(&client->dev, "%s: invalid target state %d\n",
407 __func__, state);
408 return -EINVAL;
409 }
410
411 msleep(20);
412 }
413
414 return -ETIMEDOUT;
415 }
416
417 static int raydium_i2c_write_object(struct i2c_client *client,
418 const void *data, size_t len,
419 enum raydium_bl_ack state)
420 {
421 int error;
422
423 error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
424 if (error) {
425 dev_err(&client->dev, "WRT obj command failed: %d\n",
426 error);
427 return error;
428 }
429
430 error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, NULL, 0);
431 if (error) {
432 dev_err(&client->dev, "Ack obj command failed: %d\n", error);
433 return error;
434 }
435
436 error = raydium_i2c_bl_chk_state(client, state);
437 if (error) {
438 dev_err(&client->dev, "BL check state failed: %d\n", error);
439 return error;
440 }
441 return 0;
442 }
443
444 static int raydium_i2c_boot_trigger(struct i2c_client *client)
445 {
446 static const u8 cmd[7][6] = {
447 { 0x08, 0x0C, 0x09, 0x00, 0x50, 0xD7 },
448 { 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
449 { 0x08, 0x04, 0x09, 0x00, 0x50, 0x00 },
450 { 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
451 { 0x08, 0x0C, 0x09, 0x00, 0x50, 0x00 },
452 { 0x06, 0x01, 0x00, 0x00, 0x00, 0x00 },
453 { 0x02, 0xA2, 0x00, 0x00, 0x00, 0x00 },
454 };
455 int i;
456 int error;
457
458 for (i = 0; i < 7; i++) {
459 error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
460 RAYDIUM_WAIT_READY);
461 if (error) {
462 dev_err(&client->dev,
463 "boot trigger failed at step %d: %d\n",
464 i, error);
465 return error;
466 }
467 }
468
469 return 0;
470 }
471
472 static int raydium_i2c_fw_trigger(struct i2c_client *client)
473 {
474 static const u8 cmd[5][11] = {
475 { 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0xD7, 0, 0, 0 },
476 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
477 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
478 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
479 { 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
480 };
481 int i;
482 int error;
483
484 for (i = 0; i < 5; i++) {
485 error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
486 RAYDIUM_ACK_NULL);
487 if (error) {
488 dev_err(&client->dev,
489 "fw trigger failed at step %d: %d\n",
490 i, error);
491 return error;
492 }
493 }
494
495 return 0;
496 }
497
498 static int raydium_i2c_check_path(struct i2c_client *client)
499 {
500 static const u8 cmd[] = { 0x09, 0x00, 0x09, 0x00, 0x50, 0x10, 0x00 };
501 int error;
502
503 error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
504 RAYDIUM_PATH_READY);
505 if (error) {
506 dev_err(&client->dev, "check path command failed: %d\n", error);
507 return error;
508 }
509
510 return 0;
511 }
512
513 static int raydium_i2c_enter_bl(struct i2c_client *client)
514 {
515 static const u8 cal_cmd[] = { 0x00, 0x01, 0x52 };
516 int error;
517
518 error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
519 RAYDIUM_ACK_NULL);
520 if (error) {
521 dev_err(&client->dev, "enter bl command failed: %d\n", error);
522 return error;
523 }
524
525 msleep(RM_BOOT_DELAY_MS);
526 return 0;
527 }
528
529 static int raydium_i2c_leave_bl(struct i2c_client *client)
530 {
531 static const u8 leave_cmd[] = { 0x05, 0x00 };
532 int error;
533
534 error = raydium_i2c_write_object(client, leave_cmd, sizeof(leave_cmd),
535 RAYDIUM_ACK_NULL);
536 if (error) {
537 dev_err(&client->dev, "leave bl command failed: %d\n", error);
538 return error;
539 }
540
541 msleep(RM_BOOT_DELAY_MS);
542 return 0;
543 }
544
545 static int raydium_i2c_write_checksum(struct i2c_client *client,
546 size_t length, u16 checksum)
547 {
548 u8 checksum_cmd[] = { 0x00, 0x05, 0x6D, 0x00, 0x00, 0x00, 0x00 };
549 int error;
550
551 put_unaligned_le16(length, &checksum_cmd[3]);
552 put_unaligned_le16(checksum, &checksum_cmd[5]);
553
554 error = raydium_i2c_write_object(client,
555 checksum_cmd, sizeof(checksum_cmd),
556 RAYDIUM_ACK_NULL);
557 if (error) {
558 dev_err(&client->dev, "failed to write checksum: %d\n",
559 error);
560 return error;
561 }
562
563 return 0;
564 }
565
566 static int raydium_i2c_disable_watch_dog(struct i2c_client *client)
567 {
568 static const u8 cmd[] = { 0x0A, 0xAA };
569 int error;
570
571 error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
572 RAYDIUM_WAIT_READY);
573 if (error) {
574 dev_err(&client->dev, "disable watchdog command failed: %d\n",
575 error);
576 return error;
577 }
578
579 return 0;
580 }
581
582 static int raydium_i2c_fw_write_page(struct i2c_client *client,
583 u16 page_idx, const void *data, size_t len)
584 {
585 u8 buf[RM_BL_WRT_LEN];
586 size_t xfer_len;
587 int error;
588 int i;
589
590 BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
591
592 for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
593 buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
594 buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
595 buf[BL_PKG_IDX] = i + 1;
596
597 xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
598 memcpy(&buf[BL_DATA_STR], data, xfer_len);
599 if (len < RM_BL_WRT_PKG_SIZE)
600 memset(&buf[BL_DATA_STR + xfer_len], 0xff,
601 RM_BL_WRT_PKG_SIZE - xfer_len);
602
603 error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
604 RAYDIUM_WAIT_READY);
605 if (error) {
606 dev_err(&client->dev,
607 "page write command failed for page %d, chunk %d: %d\n",
608 page_idx, i, error);
609 return error;
610 }
611
612 data += xfer_len;
613 len -= xfer_len;
614 }
615
616 return error;
617 }
618
619 static u16 raydium_calc_chksum(const u8 *buf, u16 len)
620 {
621 u16 checksum = 0;
622 u16 i;
623
624 for (i = 0; i < len; i++)
625 checksum += buf[i];
626
627 return checksum;
628 }
629
630 static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
631 const struct firmware *fw)
632 {
633 struct i2c_client *client = ts->client;
634 const void *data;
635 size_t data_len;
636 size_t len;
637 int page_nr;
638 int i;
639 int error;
640 u16 fw_checksum;
641
642 if (fw->size == 0 || fw->size > RM_MAX_FW_SIZE) {
643 dev_err(&client->dev, "Invalid firmware length\n");
644 return -EINVAL;
645 }
646
647 error = raydium_i2c_check_fw_status(ts);
648 if (error) {
649 dev_err(&client->dev, "Unable to access IC %d\n", error);
650 return error;
651 }
652
653 if (ts->boot_mode == RAYDIUM_TS_MAIN) {
654 for (i = 0; i < RM_MAX_RETRIES; i++) {
655 error = raydium_i2c_enter_bl(client);
656 if (!error) {
657 error = raydium_i2c_check_fw_status(ts);
658 if (error) {
659 dev_err(&client->dev,
660 "unable to access IC: %d\n",
661 error);
662 return error;
663 }
664
665 if (ts->boot_mode == RAYDIUM_TS_BLDR)
666 break;
667 }
668 }
669
670 if (ts->boot_mode == RAYDIUM_TS_MAIN) {
671 dev_err(&client->dev,
672 "failied to jump to boot loader: %d\n",
673 error);
674 return -EIO;
675 }
676 }
677
678 error = raydium_i2c_disable_watch_dog(client);
679 if (error)
680 return error;
681
682 error = raydium_i2c_check_path(client);
683 if (error)
684 return error;
685
686 error = raydium_i2c_boot_trigger(client);
687 if (error) {
688 dev_err(&client->dev, "send boot trigger fail: %d\n", error);
689 return error;
690 }
691
692 msleep(RM_BOOT_DELAY_MS);
693
694 data = fw->data;
695 data_len = fw->size;
696 page_nr = 0;
697
698 while (data_len) {
699 len = min_t(size_t, data_len, RM_FW_PAGE_SIZE);
700
701 error = raydium_i2c_fw_write_page(client, page_nr++, data, len);
702 if (error)
703 return error;
704
705 msleep(20);
706
707 data += len;
708 data_len -= len;
709 }
710
711 error = raydium_i2c_leave_bl(client);
712 if (error) {
713 dev_err(&client->dev,
714 "failed to leave boot loader: %d\n", error);
715 return error;
716 }
717
718 dev_dbg(&client->dev, "left boot loader mode\n");
719 msleep(RM_BOOT_DELAY_MS);
720
721 error = raydium_i2c_check_fw_status(ts);
722 if (error) {
723 dev_err(&client->dev,
724 "failed to check fw status after write: %d\n",
725 error);
726 return error;
727 }
728
729 if (ts->boot_mode != RAYDIUM_TS_MAIN) {
730 dev_err(&client->dev,
731 "failed to switch to main fw after writing firmware: %d\n",
732 error);
733 return -EINVAL;
734 }
735
736 error = raydium_i2c_fw_trigger(client);
737 if (error) {
738 dev_err(&client->dev, "failed to trigger fw: %d\n", error);
739 return error;
740 }
741
742 fw_checksum = raydium_calc_chksum(fw->data, fw->size);
743
744 error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
745 if (error)
746 return error;
747
748 return 0;
749 }
750
751 static int raydium_i2c_fw_update(struct raydium_data *ts)
752 {
753 struct i2c_client *client = ts->client;
754 const struct firmware *fw = NULL;
755 const char *fw_file = "raydium.fw";
756 int error;
757
758 error = request_firmware(&fw, fw_file, &client->dev);
759 if (error) {
760 dev_err(&client->dev, "Unable to open firmware %s\n", fw_file);
761 return error;
762 }
763
764 disable_irq(client->irq);
765
766 error = raydium_i2c_do_update_firmware(ts, fw);
767 if (error) {
768 dev_err(&client->dev, "firmware update failed: %d\n", error);
769 ts->boot_mode = RAYDIUM_TS_BLDR;
770 goto out_enable_irq;
771 }
772
773 error = raydium_i2c_initialize(ts);
774 if (error) {
775 dev_err(&client->dev,
776 "failed to initialize device after firmware update: %d\n",
777 error);
778 ts->boot_mode = RAYDIUM_TS_BLDR;
779 goto out_enable_irq;
780 }
781
782 ts->boot_mode = RAYDIUM_TS_MAIN;
783
784 out_enable_irq:
785 enable_irq(client->irq);
786 msleep(100);
787
788 release_firmware(fw);
789
790 return error;
791 }
792
793 static void raydium_mt_event(struct raydium_data *ts)
794 {
795 int i;
796
797 for (i = 0; i < ts->report_size / ts->contact_size; i++) {
798 u8 *contact = &ts->report_data[ts->contact_size * i];
799 bool state = contact[RM_CONTACT_STATE_POS];
800 u8 wx, wy;
801
802 input_mt_slot(ts->input, i);
803 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);
804
805 if (!state)
806 continue;
807
808 input_report_abs(ts->input, ABS_MT_POSITION_X,
809 get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
810 input_report_abs(ts->input, ABS_MT_POSITION_Y,
811 get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
812 input_report_abs(ts->input, ABS_MT_PRESSURE,
813 contact[RM_CONTACT_PRESSURE_POS]);
814
815 wx = contact[RM_CONTACT_WIDTH_X_POS];
816 wy = contact[RM_CONTACT_WIDTH_Y_POS];
817
818 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
819 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
820 }
821
822 input_mt_sync_frame(ts->input);
823 input_sync(ts->input);
824 }
825
826 static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
827 {
828 struct raydium_data *ts = _dev;
829 int error;
830 u16 fw_crc;
831 u16 calc_crc;
832
833 if (ts->boot_mode != RAYDIUM_TS_MAIN)
834 goto out;
835
836 error = raydium_i2c_read_message(ts->client, ts->data_bank_addr,
837 ts->report_data, ts->pkg_size);
838 if (error)
839 goto out;
840
841 fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
842 calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
843 if (unlikely(fw_crc != calc_crc)) {
844 dev_warn(&ts->client->dev,
845 "%s: invalid packet crc %#04x vs %#04x\n",
846 __func__, calc_crc, fw_crc);
847 goto out;
848 }
849
850 raydium_mt_event(ts);
851
852 out:
853 return IRQ_HANDLED;
854 }
855
856 static ssize_t raydium_i2c_fw_ver_show(struct device *dev,
857 struct device_attribute *attr, char *buf)
858 {
859 struct i2c_client *client = to_i2c_client(dev);
860 struct raydium_data *ts = i2c_get_clientdata(client);
861
862 return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
863 }
864
865 static ssize_t raydium_i2c_hw_ver_show(struct device *dev,
866 struct device_attribute *attr, char *buf)
867 {
868 struct i2c_client *client = to_i2c_client(dev);
869 struct raydium_data *ts = i2c_get_clientdata(client);
870
871 return sprintf(buf, "%#04x\n", le32_to_cpu(ts->info.hw_ver));
872 }
873
874 static ssize_t raydium_i2c_boot_mode_show(struct device *dev,
875 struct device_attribute *attr,
876 char *buf)
877 {
878 struct i2c_client *client = to_i2c_client(dev);
879 struct raydium_data *ts = i2c_get_clientdata(client);
880
881 return sprintf(buf, "%s\n",
882 ts->boot_mode == RAYDIUM_TS_MAIN ?
883 "Normal" : "Recovery");
884 }
885
886 static ssize_t raydium_i2c_update_fw_store(struct device *dev,
887 struct device_attribute *attr,
888 const char *buf, size_t count)
889 {
890 struct i2c_client *client = to_i2c_client(dev);
891 struct raydium_data *ts = i2c_get_clientdata(client);
892 int error;
893
894 error = mutex_lock_interruptible(&ts->sysfs_mutex);
895 if (error)
896 return error;
897
898 error = raydium_i2c_fw_update(ts);
899
900 mutex_unlock(&ts->sysfs_mutex);
901
902 return error ?: count;
903 }
904
905 static ssize_t raydium_i2c_calibrate_store(struct device *dev,
906 struct device_attribute *attr,
907 const char *buf, size_t count)
908 {
909 struct i2c_client *client = to_i2c_client(dev);
910 struct raydium_data *ts = i2c_get_clientdata(client);
911 static const u8 cal_cmd[] = { 0x00, 0x01, 0x9E };
912 int error;
913
914 error = mutex_lock_interruptible(&ts->sysfs_mutex);
915 if (error)
916 return error;
917
918 error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
919 RAYDIUM_WAIT_READY);
920 if (error)
921 dev_err(&client->dev, "calibrate command failed: %d\n", error);
922
923 mutex_unlock(&ts->sysfs_mutex);
924 return error ?: count;
925 }
926
927 static DEVICE_ATTR(fw_version, S_IRUGO, raydium_i2c_fw_ver_show, NULL);
928 static DEVICE_ATTR(hw_version, S_IRUGO, raydium_i2c_hw_ver_show, NULL);
929 static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_i2c_boot_mode_show, NULL);
930 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, raydium_i2c_update_fw_store);
931 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, raydium_i2c_calibrate_store);
932
933 static struct attribute *raydium_i2c_attributes[] = {
934 &dev_attr_update_fw.attr,
935 &dev_attr_boot_mode.attr,
936 &dev_attr_fw_version.attr,
937 &dev_attr_hw_version.attr,
938 &dev_attr_calibrate.attr,
939 NULL
940 };
941
942 static struct attribute_group raydium_i2c_attribute_group = {
943 .attrs = raydium_i2c_attributes,
944 };
945
946 static void raydium_i2c_remove_sysfs_group(void *_data)
947 {
948 struct raydium_data *ts = _data;
949
950 sysfs_remove_group(&ts->client->dev.kobj, &raydium_i2c_attribute_group);
951 }
952
953 static int raydium_i2c_power_on(struct raydium_data *ts)
954 {
955 int error;
956
957 if (!ts->reset_gpio)
958 return 0;
959
960 gpiod_set_value_cansleep(ts->reset_gpio, 1);
961
962 error = regulator_enable(ts->avdd);
963 if (error) {
964 dev_err(&ts->client->dev,
965 "failed to enable avdd regulator: %d\n", error);
966 goto release_reset_gpio;
967 }
968
969 error = regulator_enable(ts->vccio);
970 if (error) {
971 regulator_disable(ts->avdd);
972 dev_err(&ts->client->dev,
973 "failed to enable vccio regulator: %d\n", error);
974 goto release_reset_gpio;
975 }
976
977 udelay(RM_POWERON_DELAY_USEC);
978
979 release_reset_gpio:
980 gpiod_set_value_cansleep(ts->reset_gpio, 0);
981
982 if (error)
983 return error;
984
985 msleep(RM_RESET_DELAY_MSEC);
986
987 return 0;
988 }
989
990 static void raydium_i2c_power_off(void *_data)
991 {
992 struct raydium_data *ts = _data;
993
994 if (ts->reset_gpio) {
995 gpiod_set_value_cansleep(ts->reset_gpio, 1);
996 regulator_disable(ts->vccio);
997 regulator_disable(ts->avdd);
998 }
999 }
1000
1001 static int raydium_i2c_probe(struct i2c_client *client,
1002 const struct i2c_device_id *id)
1003 {
1004 union i2c_smbus_data dummy;
1005 struct raydium_data *ts;
1006 int error;
1007
1008 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1009 dev_err(&client->dev,
1010 "i2c check functionality error (need I2C_FUNC_I2C)\n");
1011 return -ENXIO;
1012 }
1013
1014 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1015 if (!ts)
1016 return -ENOMEM;
1017
1018 mutex_init(&ts->sysfs_mutex);
1019
1020 ts->client = client;
1021 i2c_set_clientdata(client, ts);
1022
1023 ts->avdd = devm_regulator_get(&client->dev, "avdd");
1024 if (IS_ERR(ts->avdd)) {
1025 error = PTR_ERR(ts->avdd);
1026 if (error != -EPROBE_DEFER)
1027 dev_err(&client->dev,
1028 "Failed to get 'avdd' regulator: %d\n", error);
1029 return error;
1030 }
1031
1032 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1033 if (IS_ERR(ts->vccio)) {
1034 error = PTR_ERR(ts->vccio);
1035 if (error != -EPROBE_DEFER)
1036 dev_err(&client->dev,
1037 "Failed to get 'vccio' regulator: %d\n", error);
1038 return error;
1039 }
1040
1041 ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1042 GPIOD_OUT_LOW);
1043 if (IS_ERR(ts->reset_gpio)) {
1044 error = PTR_ERR(ts->reset_gpio);
1045 if (error != -EPROBE_DEFER)
1046 dev_err(&client->dev,
1047 "failed to get reset gpio: %d\n", error);
1048 return error;
1049 }
1050
1051 error = raydium_i2c_power_on(ts);
1052 if (error)
1053 return error;
1054
1055 error = devm_add_action(&client->dev, raydium_i2c_power_off, ts);
1056 if (error) {
1057 dev_err(&client->dev,
1058 "failed to install power off action: %d\n", error);
1059 raydium_i2c_power_off(ts);
1060 return error;
1061 }
1062
1063 /* Make sure there is something at this address */
1064 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1065 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1066 dev_err(&client->dev, "nothing at this address\n");
1067 return -ENXIO;
1068 }
1069
1070 error = raydium_i2c_initialize(ts);
1071 if (error) {
1072 dev_err(&client->dev, "failed to initialize: %d\n", error);
1073 return error;
1074 }
1075
1076 ts->report_data = devm_kmalloc(&client->dev,
1077 ts->pkg_size, GFP_KERNEL);
1078 if (!ts->report_data)
1079 return -ENOMEM;
1080
1081 ts->input = devm_input_allocate_device(&client->dev);
1082 if (!ts->input) {
1083 dev_err(&client->dev, "Failed to allocate input device\n");
1084 return -ENOMEM;
1085 }
1086
1087 ts->input->name = "Raydium Touchscreen";
1088 ts->input->id.bustype = BUS_I2C;
1089
1090 input_set_drvdata(ts->input, ts);
1091
1092 input_set_abs_params(ts->input, ABS_MT_POSITION_X,
1093 0, le16_to_cpu(ts->info.x_max), 0, 0);
1094 input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
1095 0, le16_to_cpu(ts->info.y_max), 0, 0);
1096 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
1097 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
1098
1099 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1100 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1101
1102 error = input_mt_init_slots(ts->input, RM_MAX_TOUCH_NUM,
1103 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1104 if (error) {
1105 dev_err(&client->dev,
1106 "failed to initialize MT slots: %d\n", error);
1107 return error;
1108 }
1109
1110 error = input_register_device(ts->input);
1111 if (error) {
1112 dev_err(&client->dev,
1113 "unable to register input device: %d\n", error);
1114 return error;
1115 }
1116
1117 error = devm_request_threaded_irq(&client->dev, client->irq,
1118 NULL, raydium_i2c_irq,
1119 IRQF_ONESHOT, client->name, ts);
1120 if (error) {
1121 dev_err(&client->dev, "Failed to register interrupt\n");
1122 return error;
1123 }
1124
1125 error = sysfs_create_group(&client->dev.kobj,
1126 &raydium_i2c_attribute_group);
1127 if (error) {
1128 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1129 error);
1130 return error;
1131 }
1132
1133 error = devm_add_action(&client->dev,
1134 raydium_i2c_remove_sysfs_group, ts);
1135 if (error) {
1136 raydium_i2c_remove_sysfs_group(ts);
1137 dev_err(&client->dev,
1138 "Failed to add sysfs cleanup action: %d\n", error);
1139 return error;
1140 }
1141
1142 return 0;
1143 }
1144
1145 static void __maybe_unused raydium_enter_sleep(struct i2c_client *client)
1146 {
1147 static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
1148 int error;
1149
1150 error = raydium_i2c_send(client, RM_CMD_ENTER_SLEEP,
1151 sleep_cmd, sizeof(sleep_cmd));
1152 if (error)
1153 dev_err(&client->dev,
1154 "sleep command failed: %d\n", error);
1155 }
1156
1157 static int __maybe_unused raydium_i2c_suspend(struct device *dev)
1158 {
1159 struct i2c_client *client = to_i2c_client(dev);
1160 struct raydium_data *ts = i2c_get_clientdata(client);
1161
1162 /* Sleep is not available in BLDR recovery mode */
1163 if (ts->boot_mode != RAYDIUM_TS_MAIN)
1164 return -EBUSY;
1165
1166 disable_irq(client->irq);
1167
1168 if (device_may_wakeup(dev)) {
1169 raydium_enter_sleep(client);
1170
1171 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1172 } else {
1173 raydium_i2c_power_off(ts);
1174 }
1175
1176 return 0;
1177 }
1178
1179 static int __maybe_unused raydium_i2c_resume(struct device *dev)
1180 {
1181 struct i2c_client *client = to_i2c_client(dev);
1182 struct raydium_data *ts = i2c_get_clientdata(client);
1183
1184 if (device_may_wakeup(dev)) {
1185 if (ts->wake_irq_enabled)
1186 disable_irq_wake(client->irq);
1187 raydium_i2c_sw_reset(client);
1188 } else {
1189 raydium_i2c_power_on(ts);
1190 raydium_i2c_initialize(ts);
1191 }
1192
1193 enable_irq(client->irq);
1194
1195 return 0;
1196 }
1197
1198 static SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
1199 raydium_i2c_suspend, raydium_i2c_resume);
1200
1201 static const struct i2c_device_id raydium_i2c_id[] = {
1202 { "raydium_i2c" , 0 },
1203 { "rm32380", 0 },
1204 { /* sentinel */ }
1205 };
1206 MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
1207
1208 #ifdef CONFIG_ACPI
1209 static const struct acpi_device_id raydium_acpi_id[] = {
1210 { "RAYD0001", 0 },
1211 { /* sentinel */ }
1212 };
1213 MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
1214 #endif
1215
1216 #ifdef CONFIG_OF
1217 static const struct of_device_id raydium_of_match[] = {
1218 { .compatible = "raydium,rm32380", },
1219 { /* sentinel */ }
1220 };
1221 MODULE_DEVICE_TABLE(of, raydium_of_match);
1222 #endif
1223
1224 static struct i2c_driver raydium_i2c_driver = {
1225 .probe = raydium_i2c_probe,
1226 .id_table = raydium_i2c_id,
1227 .driver = {
1228 .name = "raydium_ts",
1229 .pm = &raydium_i2c_pm_ops,
1230 .acpi_match_table = ACPI_PTR(raydium_acpi_id),
1231 .of_match_table = of_match_ptr(raydium_of_match),
1232 },
1233 };
1234 module_i2c_driver(raydium_i2c_driver);
1235
1236 MODULE_AUTHOR("Raydium");
1237 MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
1238 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support