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/pm_wakeirq.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/slab.h>
27 #include <asm/unaligned.h>
28
29 /* Slave I2C mode */
30 #define RM_BOOT_BLDR 0x02
31 #define RM_BOOT_MAIN 0x03
32
33 /* I2C bootoloader commands */
34 #define RM_CMD_BOOT_PAGE_WRT 0x0B /* send bl page write */
35 #define RM_CMD_BOOT_WRT 0x11 /* send bl write */
36 #define RM_CMD_BOOT_ACK 0x22 /* send ack*/
37 #define RM_CMD_BOOT_CHK 0x33 /* send data check */
38 #define RM_CMD_BOOT_READ 0x44 /* send wait bl data ready*/
39
40 #define RM_BOOT_RDY 0xFF /* bl data ready */
41 #define RM_BOOT_CMD_READHWID 0x0E /* read hwid */
42
43 /* I2C main commands */
44 #define RM_CMD_QUERY_BANK 0x2B
45 #define RM_CMD_DATA_BANK 0x4D
46 #define RM_CMD_ENTER_SLEEP 0x4E
47 #define RM_CMD_BANK_SWITCH 0xAA
48
49 #define RM_RESET_MSG_ADDR 0x40000004
50
51 #define RM_MAX_READ_SIZE 56
52 #define RM_PACKET_CRC_SIZE 2
53
54 /* Touch relative info */
55 #define RM_MAX_RETRIES 3
56 #define RM_RETRY_DELAY_MS 20
57 #define RM_MAX_TOUCH_NUM 10
58 #define RM_BOOT_DELAY_MS 100
59
60 /* Offsets in contact data */
61 #define RM_CONTACT_STATE_POS 0
62 #define RM_CONTACT_X_POS 1
63 #define RM_CONTACT_Y_POS 3
64 #define RM_CONTACT_PRESSURE_POS 5
65 #define RM_CONTACT_WIDTH_X_POS 6
66 #define RM_CONTACT_WIDTH_Y_POS 7
67
68 /* Bootloader relative info */
69 #define RM_BL_WRT_CMD_SIZE 3 /* bl flash wrt cmd size */
70 #define RM_BL_WRT_PKG_SIZE 32 /* bl wrt pkg size */
71 #define RM_BL_WRT_LEN (RM_BL_WRT_PKG_SIZE + RM_BL_WRT_CMD_SIZE)
72 #define RM_FW_PAGE_SIZE 128
73 #define RM_MAX_FW_RETRIES 30
74 #define RM_MAX_FW_SIZE 0xD000
75
76 #define RM_POWERON_DELAY_USEC 500
77 #define RM_RESET_DELAY_MSEC 50
78
79 enum raydium_bl_cmd {
80 BL_HEADER = 0,
81 BL_PAGE_STR,
82 BL_PKG_IDX,
83 BL_DATA_STR,
84 };
85
86 enum raydium_bl_ack {
87 RAYDIUM_ACK_NULL = 0,
88 RAYDIUM_WAIT_READY,
89 RAYDIUM_PATH_READY,
90 };
91
92 enum raydium_boot_mode {
93 RAYDIUM_TS_MAIN = 0,
94 RAYDIUM_TS_BLDR,
95 };
96
97 /* Response to RM_CMD_DATA_BANK request */
98 struct raydium_data_info {
99 __le32 data_bank_addr;
100 u8 pkg_size;
101 u8 tp_info_size;
102 };
103
104 struct raydium_info {
105 __le32 hw_ver; /*device version */
106 u8 main_ver;
107 u8 sub_ver;
108 __le16 ft_ver; /* test version */
109 u8 x_num;
110 u8 y_num;
111 __le16 x_max;
112 __le16 y_max;
113 u8 x_res; /* units/mm */
114 u8 y_res; /* units/mm */
115 };
116
117 /* struct raydium_data - represents state of Raydium touchscreen device */
118 struct raydium_data {
119 struct i2c_client *client;
120 struct input_dev *input;
121
122 struct regulator *avdd;
123 struct regulator *vccio;
124 struct gpio_desc *reset_gpio;
125
126 struct raydium_info info;
127
128 struct mutex sysfs_mutex;
129
130 u8 *report_data;
131
132 u32 data_bank_addr;
133 u8 report_size;
134 u8 contact_size;
135 u8 pkg_size;
136
137 enum raydium_boot_mode boot_mode;
138 };
139
140 /*
141 * Header to be sent for RM_CMD_BANK_SWITCH command. This is used by
142 * raydium_i2c_{read|send} below.
143 */
144 struct __packed raydium_bank_switch_header {
145 u8 cmd;
146 __be32 be_addr;
147 };
148
raydium_i2c_xfer(struct i2c_client * client,u32 addr,struct i2c_msg * xfer,size_t xfer_count)149 static int raydium_i2c_xfer(struct i2c_client *client, u32 addr,
150 struct i2c_msg *xfer, size_t xfer_count)
151 {
152 int ret;
153 /*
154 * If address is greater than 255, then RM_CMD_BANK_SWITCH needs to be
155 * sent first. Else, skip the header i.e. xfer[0].
156 */
157 int xfer_start_idx = (addr > 0xff) ? 0 : 1;
158 xfer_count -= xfer_start_idx;
159
160 ret = i2c_transfer(client->adapter, &xfer[xfer_start_idx], xfer_count);
161 if (likely(ret == xfer_count))
162 return 0;
163
164 return ret < 0 ? ret : -EIO;
165 }
166
raydium_i2c_send(struct i2c_client * client,u32 addr,const void * data,size_t len)167 static int raydium_i2c_send(struct i2c_client *client,
168 u32 addr, const void *data, size_t len)
169 {
170 int tries = 0;
171 int error;
172 u8 *tx_buf;
173 u8 reg_addr = addr & 0xff;
174
175 tx_buf = kmalloc(len + 1, GFP_KERNEL);
176 if (!tx_buf)
177 return -ENOMEM;
178
179 tx_buf[0] = reg_addr;
180 memcpy(tx_buf + 1, data, len);
181
182 do {
183 struct raydium_bank_switch_header header = {
184 .cmd = RM_CMD_BANK_SWITCH,
185 .be_addr = cpu_to_be32(addr),
186 };
187
188 /*
189 * Perform as a single i2c_transfer transaction to ensure that
190 * no other I2C transactions are initiated on the bus to any
191 * other device in between. Initiating transacations to other
192 * devices after RM_CMD_BANK_SWITCH is sent is known to cause
193 * issues. This is also why regmap infrastructure cannot be used
194 * for this driver. Regmap handles page(bank) switch and reads
195 * as separate i2c_transfer() operations. This can result in
196 * problems if the Raydium device is on a shared I2C bus.
197 */
198 struct i2c_msg xfer[] = {
199 {
200 .addr = client->addr,
201 .len = sizeof(header),
202 .buf = (u8 *)&header,
203 },
204 {
205 .addr = client->addr,
206 .len = len + 1,
207 .buf = tx_buf,
208 },
209 };
210
211 error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
212 if (likely(!error))
213 goto out;
214
215 msleep(RM_RETRY_DELAY_MS);
216 } while (++tries < RM_MAX_RETRIES);
217
218 dev_err(&client->dev, "%s failed: %d\n", __func__, error);
219 out:
220 kfree(tx_buf);
221 return error;
222 }
223
raydium_i2c_read(struct i2c_client * client,u32 addr,void * data,size_t len)224 static int raydium_i2c_read(struct i2c_client *client,
225 u32 addr, void *data, size_t len)
226 {
227 int error;
228
229 while (len) {
230 u8 reg_addr = addr & 0xff;
231 struct raydium_bank_switch_header header = {
232 .cmd = RM_CMD_BANK_SWITCH,
233 .be_addr = cpu_to_be32(addr),
234 };
235 size_t xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
236
237 /*
238 * Perform as a single i2c_transfer transaction to ensure that
239 * no other I2C transactions are initiated on the bus to any
240 * other device in between. Initiating transacations to other
241 * devices after RM_CMD_BANK_SWITCH is sent is known to cause
242 * issues. This is also why regmap infrastructure cannot be used
243 * for this driver. Regmap handles page(bank) switch and writes
244 * as separate i2c_transfer() operations. This can result in
245 * problems if the Raydium device is on a shared I2C bus.
246 */
247 struct i2c_msg xfer[] = {
248 {
249 .addr = client->addr,
250 .len = sizeof(header),
251 .buf = (u8 *)&header,
252 },
253 {
254 .addr = client->addr,
255 .len = 1,
256 .buf = ®_addr,
257 },
258 {
259 .addr = client->addr,
260 .len = xfer_len,
261 .buf = data,
262 .flags = I2C_M_RD,
263 }
264 };
265
266 error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
267 if (unlikely(error))
268 return error;
269
270 len -= xfer_len;
271 data += xfer_len;
272 addr += xfer_len;
273 }
274
275 return 0;
276 }
277
raydium_i2c_sw_reset(struct i2c_client * client)278 static int raydium_i2c_sw_reset(struct i2c_client *client)
279 {
280 const u8 soft_rst_cmd = 0x01;
281 int error;
282
283 error = raydium_i2c_send(client, RM_RESET_MSG_ADDR, &soft_rst_cmd,
284 sizeof(soft_rst_cmd));
285 if (error) {
286 dev_err(&client->dev, "software reset failed: %d\n", error);
287 return error;
288 }
289
290 msleep(RM_RESET_DELAY_MSEC);
291
292 return 0;
293 }
294
raydium_i2c_query_ts_bootloader_info(struct raydium_data * ts)295 static int raydium_i2c_query_ts_bootloader_info(struct raydium_data *ts)
296 {
297 struct i2c_client *client = ts->client;
298 static const u8 get_hwid[] = { RM_BOOT_CMD_READHWID,
299 0x10, 0xc0, 0x01, 0x00, 0x04, 0x00 };
300 u8 rbuf[5] = { 0 };
301 u32 hw_ver;
302 int error;
303
304 error = raydium_i2c_send(client, RM_CMD_BOOT_WRT,
305 get_hwid, sizeof(get_hwid));
306 if (error) {
307 dev_err(&client->dev, "WRT HWID command failed: %d\n", error);
308 return error;
309 }
310
311 error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, rbuf, 1);
312 if (error) {
313 dev_err(&client->dev, "Ack HWID command failed: %d\n", error);
314 return error;
315 }
316
317 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK, rbuf, sizeof(rbuf));
318 if (error) {
319 dev_err(&client->dev, "Read HWID command failed: %d (%4ph)\n",
320 error, rbuf + 1);
321 hw_ver = 0xffffffffUL;
322 } else {
323 hw_ver = get_unaligned_be32(rbuf + 1);
324 }
325
326 ts->info.hw_ver = cpu_to_le32(hw_ver);
327 ts->info.main_ver = 0xff;
328 ts->info.sub_ver = 0xff;
329
330 return error;
331 }
332
raydium_i2c_query_ts_info(struct raydium_data * ts)333 static int raydium_i2c_query_ts_info(struct raydium_data *ts)
334 {
335 struct i2c_client *client = ts->client;
336 struct raydium_data_info data_info;
337 __le32 query_bank_addr;
338
339 int error, retry_cnt;
340
341 for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
342 error = raydium_i2c_read(client, RM_CMD_DATA_BANK,
343 &data_info, sizeof(data_info));
344 if (error)
345 continue;
346
347 /*
348 * Warn user if we already allocated memory for reports and
349 * then the size changed (due to firmware update?) and keep
350 * old size instead.
351 */
352 if (ts->report_data && ts->pkg_size != data_info.pkg_size) {
353 dev_warn(&client->dev,
354 "report size changes, was: %d, new: %d\n",
355 ts->pkg_size, data_info.pkg_size);
356 } else {
357 ts->pkg_size = data_info.pkg_size;
358 ts->report_size = ts->pkg_size - RM_PACKET_CRC_SIZE;
359 }
360
361 ts->contact_size = data_info.tp_info_size;
362 ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
363
364 dev_dbg(&client->dev,
365 "data_bank_addr: %#08x, report_size: %d, contact_size: %d\n",
366 ts->data_bank_addr, ts->report_size, ts->contact_size);
367
368 error = raydium_i2c_read(client, RM_CMD_QUERY_BANK,
369 &query_bank_addr,
370 sizeof(query_bank_addr));
371 if (error)
372 continue;
373
374 error = raydium_i2c_read(client, le32_to_cpu(query_bank_addr),
375 &ts->info, sizeof(ts->info));
376 if (error)
377 continue;
378
379 return 0;
380 }
381
382 dev_err(&client->dev, "failed to query device parameters: %d\n", error);
383 return error;
384 }
385
raydium_i2c_check_fw_status(struct raydium_data * ts)386 static int raydium_i2c_check_fw_status(struct raydium_data *ts)
387 {
388 struct i2c_client *client = ts->client;
389 static const u8 bl_ack = 0x62;
390 static const u8 main_ack = 0x66;
391 u8 buf[4];
392 int error;
393
394 error = raydium_i2c_read(client, RM_CMD_BOOT_READ, buf, sizeof(buf));
395 if (!error) {
396 if (buf[0] == bl_ack)
397 ts->boot_mode = RAYDIUM_TS_BLDR;
398 else if (buf[0] == main_ack)
399 ts->boot_mode = RAYDIUM_TS_MAIN;
400 return 0;
401 }
402
403 return error;
404 }
405
raydium_i2c_initialize(struct raydium_data * ts)406 static int raydium_i2c_initialize(struct raydium_data *ts)
407 {
408 struct i2c_client *client = ts->client;
409 int error, retry_cnt;
410
411 for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
412 /* Wait for Hello packet */
413 msleep(RM_BOOT_DELAY_MS);
414
415 error = raydium_i2c_check_fw_status(ts);
416 if (error) {
417 dev_err(&client->dev,
418 "failed to read 'hello' packet: %d\n", error);
419 continue;
420 }
421
422 if (ts->boot_mode == RAYDIUM_TS_BLDR ||
423 ts->boot_mode == RAYDIUM_TS_MAIN) {
424 break;
425 }
426 }
427
428 if (error)
429 ts->boot_mode = RAYDIUM_TS_BLDR;
430
431 if (ts->boot_mode == RAYDIUM_TS_BLDR)
432 raydium_i2c_query_ts_bootloader_info(ts);
433 else
434 raydium_i2c_query_ts_info(ts);
435
436 return error;
437 }
438
raydium_i2c_bl_chk_state(struct i2c_client * client,enum raydium_bl_ack state)439 static int raydium_i2c_bl_chk_state(struct i2c_client *client,
440 enum raydium_bl_ack state)
441 {
442 static const u8 ack_ok[] = { 0xFF, 0x39, 0x30, 0x30, 0x54 };
443 u8 rbuf[sizeof(ack_ok)];
444 u8 retry;
445 int error;
446
447 for (retry = 0; retry < RM_MAX_FW_RETRIES; retry++) {
448 switch (state) {
449 case RAYDIUM_ACK_NULL:
450 return 0;
451
452 case RAYDIUM_WAIT_READY:
453 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
454 &rbuf[0], 1);
455 if (!error && rbuf[0] == RM_BOOT_RDY)
456 return 0;
457
458 break;
459
460 case RAYDIUM_PATH_READY:
461 error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
462 rbuf, sizeof(rbuf));
463 if (!error && !memcmp(rbuf, ack_ok, sizeof(ack_ok)))
464 return 0;
465
466 break;
467
468 default:
469 dev_err(&client->dev, "%s: invalid target state %d\n",
470 __func__, state);
471 return -EINVAL;
472 }
473
474 msleep(20);
475 }
476
477 return -ETIMEDOUT;
478 }
479
raydium_i2c_write_object(struct i2c_client * client,const void * data,size_t len,enum raydium_bl_ack state)480 static int raydium_i2c_write_object(struct i2c_client *client,
481 const void *data, size_t len,
482 enum raydium_bl_ack state)
483 {
484 int error;
485 static const u8 cmd[] = { 0xFF, 0x39 };
486
487 error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
488 if (error) {
489 dev_err(&client->dev, "WRT obj command failed: %d\n",
490 error);
491 return error;
492 }
493
494 error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, cmd, sizeof(cmd));
495 if (error) {
496 dev_err(&client->dev, "Ack obj command failed: %d\n", error);
497 return error;
498 }
499
500 error = raydium_i2c_bl_chk_state(client, state);
501 if (error) {
502 dev_err(&client->dev, "BL check state failed: %d\n", error);
503 return error;
504 }
505 return 0;
506 }
507
raydium_i2c_boot_trigger(struct i2c_client * client)508 static int raydium_i2c_boot_trigger(struct i2c_client *client)
509 {
510 static const u8 cmd[7][6] = {
511 { 0x08, 0x0C, 0x09, 0x00, 0x50, 0xD7 },
512 { 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
513 { 0x08, 0x04, 0x09, 0x00, 0x50, 0x00 },
514 { 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
515 { 0x08, 0x0C, 0x09, 0x00, 0x50, 0x00 },
516 { 0x06, 0x01, 0x00, 0x00, 0x00, 0x00 },
517 { 0x02, 0xA2, 0x00, 0x00, 0x00, 0x00 },
518 };
519 int i;
520 int error;
521
522 for (i = 0; i < 7; i++) {
523 error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
524 RAYDIUM_WAIT_READY);
525 if (error) {
526 dev_err(&client->dev,
527 "boot trigger failed at step %d: %d\n",
528 i, error);
529 return error;
530 }
531 }
532
533 return 0;
534 }
535
raydium_i2c_fw_trigger(struct i2c_client * client)536 static int raydium_i2c_fw_trigger(struct i2c_client *client)
537 {
538 static const u8 cmd[5][11] = {
539 { 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0xD7, 0, 0, 0 },
540 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
541 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
542 { 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
543 { 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
544 };
545 int i;
546 int error;
547
548 for (i = 0; i < 5; i++) {
549 error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
550 RAYDIUM_ACK_NULL);
551 if (error) {
552 dev_err(&client->dev,
553 "fw trigger failed at step %d: %d\n",
554 i, error);
555 return error;
556 }
557 }
558
559 return 0;
560 }
561
raydium_i2c_check_path(struct i2c_client * client)562 static int raydium_i2c_check_path(struct i2c_client *client)
563 {
564 static const u8 cmd[] = { 0x09, 0x00, 0x09, 0x00, 0x50, 0x10, 0x00 };
565 int error;
566
567 error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
568 RAYDIUM_PATH_READY);
569 if (error) {
570 dev_err(&client->dev, "check path command failed: %d\n", error);
571 return error;
572 }
573
574 return 0;
575 }
576
raydium_i2c_enter_bl(struct i2c_client * client)577 static int raydium_i2c_enter_bl(struct i2c_client *client)
578 {
579 static const u8 cal_cmd[] = { 0x00, 0x01, 0x52 };
580 int error;
581
582 error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
583 RAYDIUM_ACK_NULL);
584 if (error) {
585 dev_err(&client->dev, "enter bl command failed: %d\n", error);
586 return error;
587 }
588
589 msleep(RM_BOOT_DELAY_MS);
590 return 0;
591 }
592
raydium_i2c_leave_bl(struct i2c_client * client)593 static int raydium_i2c_leave_bl(struct i2c_client *client)
594 {
595 static const u8 leave_cmd[] = { 0x05, 0x00 };
596 int error;
597
598 error = raydium_i2c_write_object(client, leave_cmd, sizeof(leave_cmd),
599 RAYDIUM_ACK_NULL);
600 if (error) {
601 dev_err(&client->dev, "leave bl command failed: %d\n", error);
602 return error;
603 }
604
605 msleep(RM_BOOT_DELAY_MS);
606 return 0;
607 }
608
raydium_i2c_write_checksum(struct i2c_client * client,size_t length,u16 checksum)609 static int raydium_i2c_write_checksum(struct i2c_client *client,
610 size_t length, u16 checksum)
611 {
612 u8 checksum_cmd[] = { 0x00, 0x05, 0x6D, 0x00, 0x00, 0x00, 0x00 };
613 int error;
614
615 put_unaligned_le16(length, &checksum_cmd[3]);
616 put_unaligned_le16(checksum, &checksum_cmd[5]);
617
618 error = raydium_i2c_write_object(client,
619 checksum_cmd, sizeof(checksum_cmd),
620 RAYDIUM_ACK_NULL);
621 if (error) {
622 dev_err(&client->dev, "failed to write checksum: %d\n",
623 error);
624 return error;
625 }
626
627 return 0;
628 }
629
raydium_i2c_disable_watch_dog(struct i2c_client * client)630 static int raydium_i2c_disable_watch_dog(struct i2c_client *client)
631 {
632 static const u8 cmd[] = { 0x0A, 0xAA };
633 int error;
634
635 error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
636 RAYDIUM_WAIT_READY);
637 if (error) {
638 dev_err(&client->dev, "disable watchdog command failed: %d\n",
639 error);
640 return error;
641 }
642
643 return 0;
644 }
645
raydium_i2c_fw_write_page(struct i2c_client * client,u16 page_idx,const void * data,size_t len)646 static int raydium_i2c_fw_write_page(struct i2c_client *client,
647 u16 page_idx, const void *data, size_t len)
648 {
649 u8 buf[RM_BL_WRT_LEN];
650 size_t xfer_len;
651 int error;
652 int i;
653
654 BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
655
656 for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
657 buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
658 buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
659 buf[BL_PKG_IDX] = i + 1;
660
661 xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
662 memcpy(&buf[BL_DATA_STR], data, xfer_len);
663 if (len < RM_BL_WRT_PKG_SIZE)
664 memset(&buf[BL_DATA_STR + xfer_len], 0xff,
665 RM_BL_WRT_PKG_SIZE - xfer_len);
666
667 error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
668 RAYDIUM_WAIT_READY);
669 if (error) {
670 dev_err(&client->dev,
671 "page write command failed for page %d, chunk %d: %d\n",
672 page_idx, i, error);
673 return error;
674 }
675
676 data += xfer_len;
677 len -= xfer_len;
678 }
679
680 return error;
681 }
682
raydium_calc_chksum(const u8 * buf,u16 len)683 static u16 raydium_calc_chksum(const u8 *buf, u16 len)
684 {
685 u16 checksum = 0;
686 u16 i;
687
688 for (i = 0; i < len; i++)
689 checksum += buf[i];
690
691 return checksum;
692 }
693
raydium_i2c_do_update_firmware(struct raydium_data * ts,const struct firmware * fw)694 static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
695 const struct firmware *fw)
696 {
697 struct i2c_client *client = ts->client;
698 const void *data;
699 size_t data_len;
700 size_t len;
701 int page_nr;
702 int i;
703 int error;
704 u16 fw_checksum;
705
706 if (fw->size == 0 || fw->size > RM_MAX_FW_SIZE) {
707 dev_err(&client->dev, "Invalid firmware length\n");
708 return -EINVAL;
709 }
710
711 error = raydium_i2c_check_fw_status(ts);
712 if (error) {
713 dev_err(&client->dev, "Unable to access IC %d\n", error);
714 return error;
715 }
716
717 if (ts->boot_mode == RAYDIUM_TS_MAIN) {
718 for (i = 0; i < RM_MAX_RETRIES; i++) {
719 error = raydium_i2c_enter_bl(client);
720 if (!error) {
721 error = raydium_i2c_check_fw_status(ts);
722 if (error) {
723 dev_err(&client->dev,
724 "unable to access IC: %d\n",
725 error);
726 return error;
727 }
728
729 if (ts->boot_mode == RAYDIUM_TS_BLDR)
730 break;
731 }
732 }
733
734 if (ts->boot_mode == RAYDIUM_TS_MAIN) {
735 dev_err(&client->dev,
736 "failed to jump to boot loader: %d\n",
737 error);
738 return -EIO;
739 }
740 }
741
742 error = raydium_i2c_disable_watch_dog(client);
743 if (error)
744 return error;
745
746 error = raydium_i2c_check_path(client);
747 if (error)
748 return error;
749
750 error = raydium_i2c_boot_trigger(client);
751 if (error) {
752 dev_err(&client->dev, "send boot trigger fail: %d\n", error);
753 return error;
754 }
755
756 msleep(RM_BOOT_DELAY_MS);
757
758 data = fw->data;
759 data_len = fw->size;
760 page_nr = 0;
761
762 while (data_len) {
763 len = min_t(size_t, data_len, RM_FW_PAGE_SIZE);
764
765 error = raydium_i2c_fw_write_page(client, page_nr++, data, len);
766 if (error)
767 return error;
768
769 msleep(20);
770
771 data += len;
772 data_len -= len;
773 }
774
775 error = raydium_i2c_leave_bl(client);
776 if (error) {
777 dev_err(&client->dev,
778 "failed to leave boot loader: %d\n", error);
779 return error;
780 }
781
782 dev_dbg(&client->dev, "left boot loader mode\n");
783 msleep(RM_BOOT_DELAY_MS);
784
785 error = raydium_i2c_check_fw_status(ts);
786 if (error) {
787 dev_err(&client->dev,
788 "failed to check fw status after write: %d\n",
789 error);
790 return error;
791 }
792
793 if (ts->boot_mode != RAYDIUM_TS_MAIN) {
794 dev_err(&client->dev,
795 "failed to switch to main fw after writing firmware: %d\n",
796 error);
797 return -EINVAL;
798 }
799
800 error = raydium_i2c_fw_trigger(client);
801 if (error) {
802 dev_err(&client->dev, "failed to trigger fw: %d\n", error);
803 return error;
804 }
805
806 fw_checksum = raydium_calc_chksum(fw->data, fw->size);
807
808 error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
809 if (error)
810 return error;
811
812 return 0;
813 }
814
raydium_i2c_fw_update(struct raydium_data * ts)815 static int raydium_i2c_fw_update(struct raydium_data *ts)
816 {
817 struct i2c_client *client = ts->client;
818 const struct firmware *fw = NULL;
819 char *fw_file;
820 int error;
821
822 fw_file = kasprintf(GFP_KERNEL, "raydium_%#04x.fw",
823 le32_to_cpu(ts->info.hw_ver));
824 if (!fw_file)
825 return -ENOMEM;
826
827 dev_dbg(&client->dev, "firmware name: %s\n", fw_file);
828
829 error = request_firmware(&fw, fw_file, &client->dev);
830 if (error) {
831 dev_err(&client->dev, "Unable to open firmware %s\n", fw_file);
832 goto out_free_fw_file;
833 }
834
835 disable_irq(client->irq);
836
837 error = raydium_i2c_do_update_firmware(ts, fw);
838 if (error) {
839 dev_err(&client->dev, "firmware update failed: %d\n", error);
840 ts->boot_mode = RAYDIUM_TS_BLDR;
841 goto out_enable_irq;
842 }
843
844 error = raydium_i2c_initialize(ts);
845 if (error) {
846 dev_err(&client->dev,
847 "failed to initialize device after firmware update: %d\n",
848 error);
849 ts->boot_mode = RAYDIUM_TS_BLDR;
850 goto out_enable_irq;
851 }
852
853 ts->boot_mode = RAYDIUM_TS_MAIN;
854
855 out_enable_irq:
856 enable_irq(client->irq);
857 msleep(100);
858
859 release_firmware(fw);
860
861 out_free_fw_file:
862 kfree(fw_file);
863
864 return error;
865 }
866
raydium_mt_event(struct raydium_data * ts)867 static void raydium_mt_event(struct raydium_data *ts)
868 {
869 int i;
870
871 for (i = 0; i < ts->report_size / ts->contact_size; i++) {
872 u8 *contact = &ts->report_data[ts->contact_size * i];
873 bool state = contact[RM_CONTACT_STATE_POS];
874 u8 wx, wy;
875
876 input_mt_slot(ts->input, i);
877 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);
878
879 if (!state)
880 continue;
881
882 input_report_abs(ts->input, ABS_MT_POSITION_X,
883 get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
884 input_report_abs(ts->input, ABS_MT_POSITION_Y,
885 get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
886 input_report_abs(ts->input, ABS_MT_PRESSURE,
887 contact[RM_CONTACT_PRESSURE_POS]);
888
889 wx = contact[RM_CONTACT_WIDTH_X_POS];
890 wy = contact[RM_CONTACT_WIDTH_Y_POS];
891
892 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
893 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
894 }
895
896 input_mt_sync_frame(ts->input);
897 input_sync(ts->input);
898 }
899
raydium_i2c_irq(int irq,void * _dev)900 static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
901 {
902 struct raydium_data *ts = _dev;
903 int error;
904 u16 fw_crc;
905 u16 calc_crc;
906
907 if (ts->boot_mode != RAYDIUM_TS_MAIN)
908 goto out;
909
910 error = raydium_i2c_read(ts->client, ts->data_bank_addr,
911 ts->report_data, ts->pkg_size);
912 if (error)
913 goto out;
914
915 fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
916 calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
917 if (unlikely(fw_crc != calc_crc)) {
918 dev_warn(&ts->client->dev,
919 "%s: invalid packet crc %#04x vs %#04x\n",
920 __func__, calc_crc, fw_crc);
921 goto out;
922 }
923
924 raydium_mt_event(ts);
925
926 out:
927 return IRQ_HANDLED;
928 }
929
raydium_i2c_fw_ver_show(struct device * dev,struct device_attribute * attr,char * buf)930 static ssize_t raydium_i2c_fw_ver_show(struct device *dev,
931 struct device_attribute *attr, char *buf)
932 {
933 struct i2c_client *client = to_i2c_client(dev);
934 struct raydium_data *ts = i2c_get_clientdata(client);
935
936 return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
937 }
938
raydium_i2c_hw_ver_show(struct device * dev,struct device_attribute * attr,char * buf)939 static ssize_t raydium_i2c_hw_ver_show(struct device *dev,
940 struct device_attribute *attr, char *buf)
941 {
942 struct i2c_client *client = to_i2c_client(dev);
943 struct raydium_data *ts = i2c_get_clientdata(client);
944
945 return sprintf(buf, "%#04x\n", le32_to_cpu(ts->info.hw_ver));
946 }
947
raydium_i2c_boot_mode_show(struct device * dev,struct device_attribute * attr,char * buf)948 static ssize_t raydium_i2c_boot_mode_show(struct device *dev,
949 struct device_attribute *attr,
950 char *buf)
951 {
952 struct i2c_client *client = to_i2c_client(dev);
953 struct raydium_data *ts = i2c_get_clientdata(client);
954
955 return sprintf(buf, "%s\n",
956 ts->boot_mode == RAYDIUM_TS_MAIN ?
957 "Normal" : "Recovery");
958 }
959
raydium_i2c_update_fw_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)960 static ssize_t raydium_i2c_update_fw_store(struct device *dev,
961 struct device_attribute *attr,
962 const char *buf, size_t count)
963 {
964 struct i2c_client *client = to_i2c_client(dev);
965 struct raydium_data *ts = i2c_get_clientdata(client);
966 int error;
967
968 error = mutex_lock_interruptible(&ts->sysfs_mutex);
969 if (error)
970 return error;
971
972 error = raydium_i2c_fw_update(ts);
973
974 mutex_unlock(&ts->sysfs_mutex);
975
976 return error ?: count;
977 }
978
raydium_i2c_calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)979 static ssize_t raydium_i2c_calibrate_store(struct device *dev,
980 struct device_attribute *attr,
981 const char *buf, size_t count)
982 {
983 struct i2c_client *client = to_i2c_client(dev);
984 struct raydium_data *ts = i2c_get_clientdata(client);
985 static const u8 cal_cmd[] = { 0x00, 0x01, 0x9E };
986 int error;
987
988 error = mutex_lock_interruptible(&ts->sysfs_mutex);
989 if (error)
990 return error;
991
992 error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
993 RAYDIUM_WAIT_READY);
994 if (error)
995 dev_err(&client->dev, "calibrate command failed: %d\n", error);
996
997 mutex_unlock(&ts->sysfs_mutex);
998 return error ?: count;
999 }
1000
1001 static DEVICE_ATTR(fw_version, S_IRUGO, raydium_i2c_fw_ver_show, NULL);
1002 static DEVICE_ATTR(hw_version, S_IRUGO, raydium_i2c_hw_ver_show, NULL);
1003 static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_i2c_boot_mode_show, NULL);
1004 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, raydium_i2c_update_fw_store);
1005 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, raydium_i2c_calibrate_store);
1006
1007 static struct attribute *raydium_i2c_attributes[] = {
1008 &dev_attr_update_fw.attr,
1009 &dev_attr_boot_mode.attr,
1010 &dev_attr_fw_version.attr,
1011 &dev_attr_hw_version.attr,
1012 &dev_attr_calibrate.attr,
1013 NULL
1014 };
1015
1016 static const struct attribute_group raydium_i2c_attribute_group = {
1017 .attrs = raydium_i2c_attributes,
1018 };
1019
raydium_i2c_power_on(struct raydium_data * ts)1020 static int raydium_i2c_power_on(struct raydium_data *ts)
1021 {
1022 int error;
1023
1024 if (!ts->reset_gpio)
1025 return 0;
1026
1027 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1028
1029 error = regulator_enable(ts->avdd);
1030 if (error) {
1031 dev_err(&ts->client->dev,
1032 "failed to enable avdd regulator: %d\n", error);
1033 goto release_reset_gpio;
1034 }
1035
1036 error = regulator_enable(ts->vccio);
1037 if (error) {
1038 regulator_disable(ts->avdd);
1039 dev_err(&ts->client->dev,
1040 "failed to enable vccio regulator: %d\n", error);
1041 goto release_reset_gpio;
1042 }
1043
1044 udelay(RM_POWERON_DELAY_USEC);
1045
1046 release_reset_gpio:
1047 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1048
1049 if (error)
1050 return error;
1051
1052 msleep(RM_RESET_DELAY_MSEC);
1053
1054 return 0;
1055 }
1056
raydium_i2c_power_off(void * _data)1057 static void raydium_i2c_power_off(void *_data)
1058 {
1059 struct raydium_data *ts = _data;
1060
1061 if (ts->reset_gpio) {
1062 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1063 regulator_disable(ts->vccio);
1064 regulator_disable(ts->avdd);
1065 }
1066 }
1067
raydium_i2c_probe(struct i2c_client * client)1068 static int raydium_i2c_probe(struct i2c_client *client)
1069 {
1070 union i2c_smbus_data dummy;
1071 struct raydium_data *ts;
1072 int error;
1073
1074 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1075 dev_err(&client->dev,
1076 "i2c check functionality error (need I2C_FUNC_I2C)\n");
1077 return -ENXIO;
1078 }
1079
1080 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1081 if (!ts)
1082 return -ENOMEM;
1083
1084 mutex_init(&ts->sysfs_mutex);
1085
1086 ts->client = client;
1087 i2c_set_clientdata(client, ts);
1088
1089 ts->avdd = devm_regulator_get(&client->dev, "avdd");
1090 if (IS_ERR(ts->avdd))
1091 return dev_err_probe(&client->dev, PTR_ERR(ts->avdd),
1092 "Failed to get 'avdd' regulator\n");
1093
1094 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1095 if (IS_ERR(ts->vccio))
1096 return dev_err_probe(&client->dev, PTR_ERR(ts->vccio),
1097 "Failed to get 'vccio' regulator\n");
1098
1099 ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1100 GPIOD_OUT_LOW);
1101 if (IS_ERR(ts->reset_gpio))
1102 return dev_err_probe(&client->dev, PTR_ERR(ts->reset_gpio),
1103 "Failed to get reset gpio\n");
1104
1105 error = raydium_i2c_power_on(ts);
1106 if (error)
1107 return error;
1108
1109 error = devm_add_action_or_reset(&client->dev,
1110 raydium_i2c_power_off, ts);
1111 if (error) {
1112 dev_err(&client->dev,
1113 "failed to install power off action: %d\n", error);
1114 return error;
1115 }
1116
1117 /* Make sure there is something at this address */
1118 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1119 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1120 dev_err(&client->dev, "nothing at this address\n");
1121 return -ENXIO;
1122 }
1123
1124 error = raydium_i2c_initialize(ts);
1125 if (error) {
1126 dev_err(&client->dev, "failed to initialize: %d\n", error);
1127 return error;
1128 }
1129
1130 ts->report_data = devm_kmalloc(&client->dev,
1131 ts->pkg_size, GFP_KERNEL);
1132 if (!ts->report_data)
1133 return -ENOMEM;
1134
1135 ts->input = devm_input_allocate_device(&client->dev);
1136 if (!ts->input) {
1137 dev_err(&client->dev, "Failed to allocate input device\n");
1138 return -ENOMEM;
1139 }
1140
1141 ts->input->name = "Raydium Touchscreen";
1142 ts->input->id.bustype = BUS_I2C;
1143
1144 input_set_abs_params(ts->input, ABS_MT_POSITION_X,
1145 0, le16_to_cpu(ts->info.x_max), 0, 0);
1146 input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
1147 0, le16_to_cpu(ts->info.y_max), 0, 0);
1148 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
1149 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
1150
1151 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1152 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1153
1154 error = input_mt_init_slots(ts->input, RM_MAX_TOUCH_NUM,
1155 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1156 if (error) {
1157 dev_err(&client->dev,
1158 "failed to initialize MT slots: %d\n", error);
1159 return error;
1160 }
1161
1162 error = input_register_device(ts->input);
1163 if (error) {
1164 dev_err(&client->dev,
1165 "unable to register input device: %d\n", error);
1166 return error;
1167 }
1168
1169 error = devm_request_threaded_irq(&client->dev, client->irq,
1170 NULL, raydium_i2c_irq,
1171 IRQF_ONESHOT, client->name, ts);
1172 if (error) {
1173 dev_err(&client->dev, "Failed to register interrupt\n");
1174 return error;
1175 }
1176
1177 error = devm_device_add_group(&client->dev,
1178 &raydium_i2c_attribute_group);
1179 if (error) {
1180 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1181 error);
1182 return error;
1183 }
1184
1185 return 0;
1186 }
1187
raydium_enter_sleep(struct i2c_client * client)1188 static void raydium_enter_sleep(struct i2c_client *client)
1189 {
1190 static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
1191 int error;
1192
1193 error = raydium_i2c_send(client, RM_CMD_ENTER_SLEEP,
1194 sleep_cmd, sizeof(sleep_cmd));
1195 if (error)
1196 dev_err(&client->dev,
1197 "sleep command failed: %d\n", error);
1198 }
1199
raydium_i2c_suspend(struct device * dev)1200 static int raydium_i2c_suspend(struct device *dev)
1201 {
1202 struct i2c_client *client = to_i2c_client(dev);
1203 struct raydium_data *ts = i2c_get_clientdata(client);
1204
1205 /* Sleep is not available in BLDR recovery mode */
1206 if (ts->boot_mode != RAYDIUM_TS_MAIN)
1207 return -EBUSY;
1208
1209 disable_irq(client->irq);
1210
1211 if (device_may_wakeup(dev)) {
1212 raydium_enter_sleep(client);
1213 } else {
1214 raydium_i2c_power_off(ts);
1215 }
1216
1217 return 0;
1218 }
1219
raydium_i2c_resume(struct device * dev)1220 static int raydium_i2c_resume(struct device *dev)
1221 {
1222 struct i2c_client *client = to_i2c_client(dev);
1223 struct raydium_data *ts = i2c_get_clientdata(client);
1224
1225 if (device_may_wakeup(dev)) {
1226 raydium_i2c_sw_reset(client);
1227 } else {
1228 raydium_i2c_power_on(ts);
1229 raydium_i2c_initialize(ts);
1230 }
1231
1232 enable_irq(client->irq);
1233
1234 return 0;
1235 }
1236
1237 static DEFINE_SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
1238 raydium_i2c_suspend, raydium_i2c_resume);
1239
1240 static const struct i2c_device_id raydium_i2c_id[] = {
1241 { "raydium_i2c", 0 },
1242 { "rm32380", 0 },
1243 { /* sentinel */ }
1244 };
1245 MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
1246
1247 #ifdef CONFIG_ACPI
1248 static const struct acpi_device_id raydium_acpi_id[] = {
1249 { "RAYD0001", 0 },
1250 { /* sentinel */ }
1251 };
1252 MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
1253 #endif
1254
1255 #ifdef CONFIG_OF
1256 static const struct of_device_id raydium_of_match[] = {
1257 { .compatible = "raydium,rm32380", },
1258 { /* sentinel */ }
1259 };
1260 MODULE_DEVICE_TABLE(of, raydium_of_match);
1261 #endif
1262
1263 static struct i2c_driver raydium_i2c_driver = {
1264 .probe = raydium_i2c_probe,
1265 .id_table = raydium_i2c_id,
1266 .driver = {
1267 .name = "raydium_ts",
1268 .pm = pm_sleep_ptr(&raydium_i2c_pm_ops),
1269 .acpi_match_table = ACPI_PTR(raydium_acpi_id),
1270 .of_match_table = of_match_ptr(raydium_of_match),
1271 },
1272 };
1273 module_i2c_driver(raydium_i2c_driver);
1274
1275 MODULE_AUTHOR("Raydium");
1276 MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
1277 MODULE_LICENSE("GPL v2");
1278