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[mirror_ubuntu-bionic-kernel.git] / drivers / input / touchscreen / elants_i2c.c
1 /*
2 * Elan Microelectronics touch panels with I2C interface
3 *
4 * Copyright (C) 2014 Elan Microelectronics Corporation.
5 * Scott Liu <scott.liu@emc.com.tw>
6 *
7 * This code is partly based on hid-multitouch.c:
8 *
9 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
10 * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
11 * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
12 *
13 *
14 * This code is partly based on i2c-hid.c:
15 *
16 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
17 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
18 * Copyright (c) 2012 Red Hat, Inc
19 */
20
21 /*
22 * This software is licensed under the terms of the GNU General Public
23 * License version 2, as published by the Free Software Foundation, and
24 * may be copied, distributed, and modified under those terms.
25 */
26
27 #include <linux/module.h>
28 #include <linux/input.h>
29 #include <linux/interrupt.h>
30 #include <linux/platform_device.h>
31 #include <linux/async.h>
32 #include <linux/i2c.h>
33 #include <linux/delay.h>
34 #include <linux/uaccess.h>
35 #include <linux/buffer_head.h>
36 #include <linux/slab.h>
37 #include <linux/firmware.h>
38 #include <linux/input/mt.h>
39 #include <linux/acpi.h>
40 #include <linux/of.h>
41 #include <linux/gpio/consumer.h>
42 #include <linux/regulator/consumer.h>
43 #include <asm/unaligned.h>
44
45 /* Device, Driver information */
46 #define DEVICE_NAME "elants_i2c"
47 #define DRV_VERSION "1.0.9"
48
49 /* Convert from rows or columns into resolution */
50 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m))
51
52 /* FW header data */
53 #define HEADER_SIZE 4
54 #define FW_HDR_TYPE 0
55 #define FW_HDR_COUNT 1
56 #define FW_HDR_LENGTH 2
57
58 /* Buffer mode Queue Header information */
59 #define QUEUE_HEADER_SINGLE 0x62
60 #define QUEUE_HEADER_NORMAL 0X63
61 #define QUEUE_HEADER_WAIT 0x64
62
63 /* Command header definition */
64 #define CMD_HEADER_WRITE 0x54
65 #define CMD_HEADER_READ 0x53
66 #define CMD_HEADER_6B_READ 0x5B
67 #define CMD_HEADER_RESP 0x52
68 #define CMD_HEADER_6B_RESP 0x9B
69 #define CMD_HEADER_HELLO 0x55
70 #define CMD_HEADER_REK 0x66
71
72 /* FW position data */
73 #define PACKET_SIZE 55
74 #define MAX_CONTACT_NUM 10
75 #define FW_POS_HEADER 0
76 #define FW_POS_STATE 1
77 #define FW_POS_TOTAL 2
78 #define FW_POS_XY 3
79 #define FW_POS_CHECKSUM 34
80 #define FW_POS_WIDTH 35
81 #define FW_POS_PRESSURE 45
82
83 #define HEADER_REPORT_10_FINGER 0x62
84
85 /* Header (4 bytes) plus 3 fill 10-finger packets */
86 #define MAX_PACKET_SIZE 169
87
88 #define BOOT_TIME_DELAY_MS 50
89
90 /* FW read command, 0x53 0x?? 0x0, 0x01 */
91 #define E_ELAN_INFO_FW_VER 0x00
92 #define E_ELAN_INFO_BC_VER 0x10
93 #define E_ELAN_INFO_TEST_VER 0xE0
94 #define E_ELAN_INFO_FW_ID 0xF0
95 #define E_INFO_OSR 0xD6
96 #define E_INFO_PHY_SCAN 0xD7
97 #define E_INFO_PHY_DRIVER 0xD8
98
99 #define MAX_RETRIES 3
100 #define MAX_FW_UPDATE_RETRIES 30
101
102 #define ELAN_FW_PAGESIZE 132
103
104 /* calibration timeout definition */
105 #define ELAN_CALI_TIMEOUT_MSEC 12000
106
107 #define ELAN_POWERON_DELAY_USEC 500
108 #define ELAN_RESET_DELAY_MSEC 20
109
110 enum elants_state {
111 ELAN_STATE_NORMAL,
112 ELAN_WAIT_QUEUE_HEADER,
113 ELAN_WAIT_RECALIBRATION,
114 };
115
116 enum elants_iap_mode {
117 ELAN_IAP_OPERATIONAL,
118 ELAN_IAP_RECOVERY,
119 };
120
121 /* struct elants_data - represents state of Elan touchscreen device */
122 struct elants_data {
123 struct i2c_client *client;
124 struct input_dev *input;
125
126 struct regulator *vcc33;
127 struct regulator *vccio;
128 struct gpio_desc *reset_gpio;
129
130 u16 fw_version;
131 u8 test_version;
132 u8 solution_version;
133 u8 bc_version;
134 u8 iap_version;
135 u16 hw_version;
136 unsigned int x_res; /* resolution in units/mm */
137 unsigned int y_res;
138 unsigned int x_max;
139 unsigned int y_max;
140
141 enum elants_state state;
142 enum elants_iap_mode iap_mode;
143
144 /* Guards against concurrent access to the device via sysfs */
145 struct mutex sysfs_mutex;
146
147 u8 cmd_resp[HEADER_SIZE];
148 struct completion cmd_done;
149
150 u8 buf[MAX_PACKET_SIZE];
151
152 bool wake_irq_enabled;
153 bool keep_power_in_suspend;
154 };
155
156 static int elants_i2c_send(struct i2c_client *client,
157 const void *data, size_t size)
158 {
159 int ret;
160
161 ret = i2c_master_send(client, data, size);
162 if (ret == size)
163 return 0;
164
165 if (ret >= 0)
166 ret = -EIO;
167
168 dev_err(&client->dev, "%s failed (%*ph): %d\n",
169 __func__, (int)size, data, ret);
170
171 return ret;
172 }
173
174 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
175 {
176 int ret;
177
178 ret = i2c_master_recv(client, data, size);
179 if (ret == size)
180 return 0;
181
182 if (ret >= 0)
183 ret = -EIO;
184
185 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
186
187 return ret;
188 }
189
190 static int elants_i2c_execute_command(struct i2c_client *client,
191 const u8 *cmd, size_t cmd_size,
192 u8 *resp, size_t resp_size)
193 {
194 struct i2c_msg msgs[2];
195 int ret;
196 u8 expected_response;
197
198 switch (cmd[0]) {
199 case CMD_HEADER_READ:
200 expected_response = CMD_HEADER_RESP;
201 break;
202
203 case CMD_HEADER_6B_READ:
204 expected_response = CMD_HEADER_6B_RESP;
205 break;
206
207 default:
208 dev_err(&client->dev, "%s: invalid command %*ph\n",
209 __func__, (int)cmd_size, cmd);
210 return -EINVAL;
211 }
212
213 msgs[0].addr = client->addr;
214 msgs[0].flags = client->flags & I2C_M_TEN;
215 msgs[0].len = cmd_size;
216 msgs[0].buf = (u8 *)cmd;
217
218 msgs[1].addr = client->addr;
219 msgs[1].flags = client->flags & I2C_M_TEN;
220 msgs[1].flags |= I2C_M_RD;
221 msgs[1].len = resp_size;
222 msgs[1].buf = resp;
223
224 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
225 if (ret < 0)
226 return ret;
227
228 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
229 return -EIO;
230
231 return 0;
232 }
233
234 static int elants_i2c_calibrate(struct elants_data *ts)
235 {
236 struct i2c_client *client = ts->client;
237 int ret, error;
238 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
239 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
240 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
241
242 disable_irq(client->irq);
243
244 ts->state = ELAN_WAIT_RECALIBRATION;
245 reinit_completion(&ts->cmd_done);
246
247 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
248 elants_i2c_send(client, rek, sizeof(rek));
249
250 enable_irq(client->irq);
251
252 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
253 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
254
255 ts->state = ELAN_STATE_NORMAL;
256
257 if (ret <= 0) {
258 error = ret < 0 ? ret : -ETIMEDOUT;
259 dev_err(&client->dev,
260 "error while waiting for calibration to complete: %d\n",
261 error);
262 return error;
263 }
264
265 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
266 dev_err(&client->dev,
267 "unexpected calibration response: %*ph\n",
268 (int)sizeof(ts->cmd_resp), ts->cmd_resp);
269 return -EINVAL;
270 }
271
272 return 0;
273 }
274
275 static int elants_i2c_sw_reset(struct i2c_client *client)
276 {
277 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
278 int error;
279
280 error = elants_i2c_send(client, soft_rst_cmd,
281 sizeof(soft_rst_cmd));
282 if (error) {
283 dev_err(&client->dev, "software reset failed: %d\n", error);
284 return error;
285 }
286
287 /*
288 * We should wait at least 10 msec (but no more than 40) before
289 * sending fastboot or IAP command to the device.
290 */
291 msleep(30);
292
293 return 0;
294 }
295
296 static u16 elants_i2c_parse_version(u8 *buf)
297 {
298 return get_unaligned_be32(buf) >> 4;
299 }
300
301 static int elants_i2c_query_hw_version(struct elants_data *ts)
302 {
303 struct i2c_client *client = ts->client;
304 int error, retry_cnt;
305 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
306 u8 resp[HEADER_SIZE];
307
308 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
309 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
310 resp, sizeof(resp));
311 if (!error) {
312 ts->hw_version = elants_i2c_parse_version(resp);
313 if (ts->hw_version != 0xffff)
314 return 0;
315 }
316
317 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
318 error, (int)sizeof(resp), resp);
319 }
320
321 if (error) {
322 dev_err(&client->dev,
323 "Failed to read fw id: %d\n", error);
324 return error;
325 }
326
327 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
328
329 return -EINVAL;
330 }
331
332 static int elants_i2c_query_fw_version(struct elants_data *ts)
333 {
334 struct i2c_client *client = ts->client;
335 int error, retry_cnt;
336 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
337 u8 resp[HEADER_SIZE];
338
339 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
340 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
341 resp, sizeof(resp));
342 if (!error) {
343 ts->fw_version = elants_i2c_parse_version(resp);
344 if (ts->fw_version != 0x0000 &&
345 ts->fw_version != 0xffff)
346 return 0;
347 }
348
349 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
350 error, (int)sizeof(resp), resp);
351 }
352
353 dev_err(&client->dev,
354 "Failed to read fw version or fw version is invalid\n");
355
356 return -EINVAL;
357 }
358
359 static int elants_i2c_query_test_version(struct elants_data *ts)
360 {
361 struct i2c_client *client = ts->client;
362 int error, retry_cnt;
363 u16 version;
364 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
365 u8 resp[HEADER_SIZE];
366
367 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
368 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
369 resp, sizeof(resp));
370 if (!error) {
371 version = elants_i2c_parse_version(resp);
372 ts->test_version = version >> 8;
373 ts->solution_version = version & 0xff;
374
375 return 0;
376 }
377
378 dev_dbg(&client->dev,
379 "read test version error rc=%d, buf=%*phC\n",
380 error, (int)sizeof(resp), resp);
381 }
382
383 dev_err(&client->dev, "Failed to read test version\n");
384
385 return -EINVAL;
386 }
387
388 static int elants_i2c_query_bc_version(struct elants_data *ts)
389 {
390 struct i2c_client *client = ts->client;
391 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
392 u8 resp[HEADER_SIZE];
393 u16 version;
394 int error;
395
396 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
397 resp, sizeof(resp));
398 if (error) {
399 dev_err(&client->dev,
400 "read BC version error=%d, buf=%*phC\n",
401 error, (int)sizeof(resp), resp);
402 return error;
403 }
404
405 version = elants_i2c_parse_version(resp);
406 ts->bc_version = version >> 8;
407 ts->iap_version = version & 0xff;
408
409 return 0;
410 }
411
412 static int elants_i2c_query_ts_info(struct elants_data *ts)
413 {
414 struct i2c_client *client = ts->client;
415 int error;
416 u8 resp[17];
417 u16 phy_x, phy_y, rows, cols, osr;
418 const u8 get_resolution_cmd[] = {
419 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
420 };
421 const u8 get_osr_cmd[] = {
422 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
423 };
424 const u8 get_physical_scan_cmd[] = {
425 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
426 };
427 const u8 get_physical_drive_cmd[] = {
428 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
429 };
430
431 /* Get trace number */
432 error = elants_i2c_execute_command(client,
433 get_resolution_cmd,
434 sizeof(get_resolution_cmd),
435 resp, sizeof(resp));
436 if (error) {
437 dev_err(&client->dev, "get resolution command failed: %d\n",
438 error);
439 return error;
440 }
441
442 rows = resp[2] + resp[6] + resp[10];
443 cols = resp[3] + resp[7] + resp[11];
444
445 /* Process mm_to_pixel information */
446 error = elants_i2c_execute_command(client,
447 get_osr_cmd, sizeof(get_osr_cmd),
448 resp, sizeof(resp));
449 if (error) {
450 dev_err(&client->dev, "get osr command failed: %d\n",
451 error);
452 return error;
453 }
454
455 osr = resp[3];
456
457 error = elants_i2c_execute_command(client,
458 get_physical_scan_cmd,
459 sizeof(get_physical_scan_cmd),
460 resp, sizeof(resp));
461 if (error) {
462 dev_err(&client->dev, "get physical scan command failed: %d\n",
463 error);
464 return error;
465 }
466
467 phy_x = get_unaligned_be16(&resp[2]);
468
469 error = elants_i2c_execute_command(client,
470 get_physical_drive_cmd,
471 sizeof(get_physical_drive_cmd),
472 resp, sizeof(resp));
473 if (error) {
474 dev_err(&client->dev, "get physical drive command failed: %d\n",
475 error);
476 return error;
477 }
478
479 phy_y = get_unaligned_be16(&resp[2]);
480
481 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
482
483 if (rows == 0 || cols == 0 || osr == 0) {
484 dev_warn(&client->dev,
485 "invalid trace number data: %d, %d, %d\n",
486 rows, cols, osr);
487 } else {
488 /* translate trace number to TS resolution */
489 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
490 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
491 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
492 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
493 }
494
495 return 0;
496 }
497
498 static int elants_i2c_fastboot(struct i2c_client *client)
499 {
500 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
501 int error;
502
503 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
504 if (error) {
505 dev_err(&client->dev, "boot failed: %d\n", error);
506 return error;
507 }
508
509 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
510 return 0;
511 }
512
513 static int elants_i2c_initialize(struct elants_data *ts)
514 {
515 struct i2c_client *client = ts->client;
516 int error, error2, retry_cnt;
517 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
518 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
519 u8 buf[HEADER_SIZE];
520
521 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
522 error = elants_i2c_sw_reset(client);
523 if (error) {
524 /* Continue initializing if it's the last try */
525 if (retry_cnt < MAX_RETRIES - 1)
526 continue;
527 }
528
529 error = elants_i2c_fastboot(client);
530 if (error) {
531 /* Continue initializing if it's the last try */
532 if (retry_cnt < MAX_RETRIES - 1)
533 continue;
534 }
535
536 /* Wait for Hello packet */
537 msleep(BOOT_TIME_DELAY_MS);
538
539 error = elants_i2c_read(client, buf, sizeof(buf));
540 if (error) {
541 dev_err(&client->dev,
542 "failed to read 'hello' packet: %d\n", error);
543 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
544 ts->iap_mode = ELAN_IAP_OPERATIONAL;
545 break;
546 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
547 /*
548 * Setting error code will mark device
549 * in recovery mode below.
550 */
551 error = -EIO;
552 break;
553 } else {
554 error = -EINVAL;
555 dev_err(&client->dev,
556 "invalid 'hello' packet: %*ph\n",
557 (int)sizeof(buf), buf);
558 }
559 }
560
561 /* hw version is available even if device in recovery state */
562 error2 = elants_i2c_query_hw_version(ts);
563 if (!error)
564 error = error2;
565
566 if (!error)
567 error = elants_i2c_query_fw_version(ts);
568 if (!error)
569 error = elants_i2c_query_test_version(ts);
570 if (!error)
571 error = elants_i2c_query_bc_version(ts);
572 if (!error)
573 error = elants_i2c_query_ts_info(ts);
574
575 if (error)
576 ts->iap_mode = ELAN_IAP_RECOVERY;
577
578 return 0;
579 }
580
581 /*
582 * Firmware update interface.
583 */
584
585 static int elants_i2c_fw_write_page(struct i2c_client *client,
586 const void *page)
587 {
588 const u8 ack_ok[] = { 0xaa, 0xaa };
589 u8 buf[2];
590 int retry;
591 int error;
592
593 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
594 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
595 if (error) {
596 dev_err(&client->dev,
597 "IAP Write Page failed: %d\n", error);
598 continue;
599 }
600
601 error = elants_i2c_read(client, buf, 2);
602 if (error) {
603 dev_err(&client->dev,
604 "IAP Ack read failed: %d\n", error);
605 return error;
606 }
607
608 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
609 return 0;
610
611 error = -EIO;
612 dev_err(&client->dev,
613 "IAP Get Ack Error [%02x:%02x]\n",
614 buf[0], buf[1]);
615 }
616
617 return error;
618 }
619
620 static int elants_i2c_do_update_firmware(struct i2c_client *client,
621 const struct firmware *fw,
622 bool force)
623 {
624 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
625 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
626 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
627 const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01};
628 u8 buf[HEADER_SIZE];
629 u16 send_id;
630 int page, n_fw_pages;
631 int error;
632
633 /* Recovery mode detection! */
634 if (force) {
635 dev_dbg(&client->dev, "Recovery mode procedure\n");
636 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
637 } else {
638 /* Start IAP Procedure */
639 dev_dbg(&client->dev, "Normal IAP procedure\n");
640 /* Close idle mode */
641 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
642 if (error)
643 dev_err(&client->dev, "Failed close idle: %d\n", error);
644 msleep(60);
645 elants_i2c_sw_reset(client);
646 msleep(20);
647 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
648 }
649
650 if (error) {
651 dev_err(&client->dev, "failed to enter IAP mode: %d\n", error);
652 return error;
653 }
654
655 msleep(20);
656
657 /* check IAP state */
658 error = elants_i2c_read(client, buf, 4);
659 if (error) {
660 dev_err(&client->dev,
661 "failed to read IAP acknowledgement: %d\n",
662 error);
663 return error;
664 }
665
666 if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
667 dev_err(&client->dev,
668 "failed to enter IAP: %*ph (expected %*ph)\n",
669 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
670 return -EIO;
671 }
672
673 dev_info(&client->dev, "successfully entered IAP mode");
674
675 send_id = client->addr;
676 error = elants_i2c_send(client, &send_id, 1);
677 if (error) {
678 dev_err(&client->dev, "sending dummy byte failed: %d\n",
679 error);
680 return error;
681 }
682
683 /* Clear the last page of Master */
684 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
685 if (error) {
686 dev_err(&client->dev, "clearing of the last page failed: %d\n",
687 error);
688 return error;
689 }
690
691 error = elants_i2c_read(client, buf, 2);
692 if (error) {
693 dev_err(&client->dev,
694 "failed to read ACK for clearing the last page: %d\n",
695 error);
696 return error;
697 }
698
699 n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
700 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
701
702 for (page = 0; page < n_fw_pages; page++) {
703 error = elants_i2c_fw_write_page(client,
704 fw->data + page * ELAN_FW_PAGESIZE);
705 if (error) {
706 dev_err(&client->dev,
707 "failed to write FW page %d: %d\n",
708 page, error);
709 return error;
710 }
711 }
712
713 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
714 msleep(300);
715
716 dev_info(&client->dev, "firmware update completed\n");
717 return 0;
718 }
719
720 static int elants_i2c_fw_update(struct elants_data *ts)
721 {
722 struct i2c_client *client = ts->client;
723 const struct firmware *fw;
724 char *fw_name;
725 int error;
726
727 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
728 if (!fw_name)
729 return -ENOMEM;
730
731 dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
732 error = request_firmware(&fw, fw_name, &client->dev);
733 kfree(fw_name);
734 if (error) {
735 dev_err(&client->dev, "failed to request firmware: %d\n",
736 error);
737 return error;
738 }
739
740 if (fw->size % ELAN_FW_PAGESIZE) {
741 dev_err(&client->dev, "invalid firmware length: %zu\n",
742 fw->size);
743 error = -EINVAL;
744 goto out;
745 }
746
747 disable_irq(client->irq);
748
749 error = elants_i2c_do_update_firmware(client, fw,
750 ts->iap_mode == ELAN_IAP_RECOVERY);
751 if (error) {
752 dev_err(&client->dev, "firmware update failed: %d\n", error);
753 ts->iap_mode = ELAN_IAP_RECOVERY;
754 goto out_enable_irq;
755 }
756
757 error = elants_i2c_initialize(ts);
758 if (error) {
759 dev_err(&client->dev,
760 "failed to initialize device after firmware update: %d\n",
761 error);
762 ts->iap_mode = ELAN_IAP_RECOVERY;
763 goto out_enable_irq;
764 }
765
766 ts->iap_mode = ELAN_IAP_OPERATIONAL;
767
768 out_enable_irq:
769 ts->state = ELAN_STATE_NORMAL;
770 enable_irq(client->irq);
771 msleep(100);
772
773 if (!error)
774 elants_i2c_calibrate(ts);
775 out:
776 release_firmware(fw);
777 return error;
778 }
779
780 /*
781 * Event reporting.
782 */
783
784 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
785 {
786 struct input_dev *input = ts->input;
787 unsigned int n_fingers;
788 u16 finger_state;
789 int i;
790
791 n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
792 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
793 buf[FW_POS_STATE];
794
795 dev_dbg(&ts->client->dev,
796 "n_fingers: %u, state: %04x\n", n_fingers, finger_state);
797
798 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
799 if (finger_state & 1) {
800 unsigned int x, y, p, w;
801 u8 *pos;
802
803 pos = &buf[FW_POS_XY + i * 3];
804 x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
805 y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
806 p = buf[FW_POS_PRESSURE + i];
807 w = buf[FW_POS_WIDTH + i];
808
809 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
810 i, x, y, p, w);
811
812 input_mt_slot(input, i);
813 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
814 input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
815 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
816 input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
817 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
818
819 n_fingers--;
820 }
821
822 finger_state >>= 1;
823 }
824
825 input_mt_sync_frame(input);
826 input_sync(input);
827 }
828
829 static u8 elants_i2c_calculate_checksum(u8 *buf)
830 {
831 u8 checksum = 0;
832 u8 i;
833
834 for (i = 0; i < FW_POS_CHECKSUM; i++)
835 checksum += buf[i];
836
837 return checksum;
838 }
839
840 static void elants_i2c_event(struct elants_data *ts, u8 *buf)
841 {
842 u8 checksum = elants_i2c_calculate_checksum(buf);
843
844 if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
845 dev_warn(&ts->client->dev,
846 "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
847 __func__, buf[FW_POS_HEADER],
848 checksum, buf[FW_POS_CHECKSUM]);
849 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
850 dev_warn(&ts->client->dev,
851 "%s: unknown packet type: %02x\n",
852 __func__, buf[FW_POS_HEADER]);
853 else
854 elants_i2c_mt_event(ts, buf);
855 }
856
857 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
858 {
859 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
860 struct elants_data *ts = _dev;
861 struct i2c_client *client = ts->client;
862 int report_count, report_len;
863 int i;
864 int len;
865
866 len = i2c_master_recv(client, ts->buf, sizeof(ts->buf));
867 if (len < 0) {
868 dev_err(&client->dev, "%s: failed to read data: %d\n",
869 __func__, len);
870 goto out;
871 }
872
873 dev_dbg(&client->dev, "%s: packet %*ph\n",
874 __func__, HEADER_SIZE, ts->buf);
875
876 switch (ts->state) {
877 case ELAN_WAIT_RECALIBRATION:
878 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
879 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
880 complete(&ts->cmd_done);
881 ts->state = ELAN_STATE_NORMAL;
882 }
883 break;
884
885 case ELAN_WAIT_QUEUE_HEADER:
886 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
887 break;
888
889 ts->state = ELAN_STATE_NORMAL;
890 /* fall through */
891
892 case ELAN_STATE_NORMAL:
893
894 switch (ts->buf[FW_HDR_TYPE]) {
895 case CMD_HEADER_HELLO:
896 case CMD_HEADER_RESP:
897 case CMD_HEADER_REK:
898 break;
899
900 case QUEUE_HEADER_WAIT:
901 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
902 dev_err(&client->dev,
903 "invalid wait packet %*ph\n",
904 HEADER_SIZE, ts->buf);
905 } else {
906 ts->state = ELAN_WAIT_QUEUE_HEADER;
907 udelay(30);
908 }
909 break;
910
911 case QUEUE_HEADER_SINGLE:
912 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
913 break;
914
915 case QUEUE_HEADER_NORMAL:
916 report_count = ts->buf[FW_HDR_COUNT];
917 if (report_count == 0 || report_count > 3) {
918 dev_err(&client->dev,
919 "bad report count: %*ph\n",
920 HEADER_SIZE, ts->buf);
921 break;
922 }
923
924 report_len = ts->buf[FW_HDR_LENGTH] / report_count;
925 if (report_len != PACKET_SIZE) {
926 dev_err(&client->dev,
927 "mismatching report length: %*ph\n",
928 HEADER_SIZE, ts->buf);
929 break;
930 }
931
932 for (i = 0; i < report_count; i++) {
933 u8 *buf = ts->buf + HEADER_SIZE +
934 i * PACKET_SIZE;
935 elants_i2c_event(ts, buf);
936 }
937 break;
938
939 default:
940 dev_err(&client->dev, "unknown packet %*ph\n",
941 HEADER_SIZE, ts->buf);
942 break;
943 }
944 break;
945 }
946
947 out:
948 return IRQ_HANDLED;
949 }
950
951 /*
952 * sysfs interface
953 */
954 static ssize_t calibrate_store(struct device *dev,
955 struct device_attribute *attr,
956 const char *buf, size_t count)
957 {
958 struct i2c_client *client = to_i2c_client(dev);
959 struct elants_data *ts = i2c_get_clientdata(client);
960 int error;
961
962 error = mutex_lock_interruptible(&ts->sysfs_mutex);
963 if (error)
964 return error;
965
966 error = elants_i2c_calibrate(ts);
967
968 mutex_unlock(&ts->sysfs_mutex);
969 return error ?: count;
970 }
971
972 static ssize_t write_update_fw(struct device *dev,
973 struct device_attribute *attr,
974 const char *buf, size_t count)
975 {
976 struct i2c_client *client = to_i2c_client(dev);
977 struct elants_data *ts = i2c_get_clientdata(client);
978 int error;
979
980 error = mutex_lock_interruptible(&ts->sysfs_mutex);
981 if (error)
982 return error;
983
984 error = elants_i2c_fw_update(ts);
985 dev_dbg(dev, "firmware update result: %d\n", error);
986
987 mutex_unlock(&ts->sysfs_mutex);
988 return error ?: count;
989 }
990
991 static ssize_t show_iap_mode(struct device *dev,
992 struct device_attribute *attr, char *buf)
993 {
994 struct i2c_client *client = to_i2c_client(dev);
995 struct elants_data *ts = i2c_get_clientdata(client);
996
997 return sprintf(buf, "%s\n",
998 ts->iap_mode == ELAN_IAP_OPERATIONAL ?
999 "Normal" : "Recovery");
1000 }
1001
1002 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, calibrate_store);
1003 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1004 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1005
1006 struct elants_version_attribute {
1007 struct device_attribute dattr;
1008 size_t field_offset;
1009 size_t field_size;
1010 };
1011
1012 #define __ELANTS_FIELD_SIZE(_field) \
1013 sizeof(((struct elants_data *)NULL)->_field)
1014 #define __ELANTS_VERIFY_SIZE(_field) \
1015 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \
1016 __ELANTS_FIELD_SIZE(_field))
1017 #define ELANTS_VERSION_ATTR(_field) \
1018 struct elants_version_attribute elants_ver_attr_##_field = { \
1019 .dattr = __ATTR(_field, S_IRUGO, \
1020 elants_version_attribute_show, NULL), \
1021 .field_offset = offsetof(struct elants_data, _field), \
1022 .field_size = __ELANTS_VERIFY_SIZE(_field), \
1023 }
1024
1025 static ssize_t elants_version_attribute_show(struct device *dev,
1026 struct device_attribute *dattr,
1027 char *buf)
1028 {
1029 struct i2c_client *client = to_i2c_client(dev);
1030 struct elants_data *ts = i2c_get_clientdata(client);
1031 struct elants_version_attribute *attr =
1032 container_of(dattr, struct elants_version_attribute, dattr);
1033 u8 *field = (u8 *)((char *)ts + attr->field_offset);
1034 unsigned int fmt_size;
1035 unsigned int val;
1036
1037 if (attr->field_size == 1) {
1038 val = *field;
1039 fmt_size = 2; /* 2 HEX digits */
1040 } else {
1041 val = *(u16 *)field;
1042 fmt_size = 4; /* 4 HEX digits */
1043 }
1044
1045 return sprintf(buf, "%0*x\n", fmt_size, val);
1046 }
1047
1048 static ELANTS_VERSION_ATTR(fw_version);
1049 static ELANTS_VERSION_ATTR(hw_version);
1050 static ELANTS_VERSION_ATTR(test_version);
1051 static ELANTS_VERSION_ATTR(solution_version);
1052 static ELANTS_VERSION_ATTR(bc_version);
1053 static ELANTS_VERSION_ATTR(iap_version);
1054
1055 static struct attribute *elants_attributes[] = {
1056 &dev_attr_calibrate.attr,
1057 &dev_attr_update_fw.attr,
1058 &dev_attr_iap_mode.attr,
1059
1060 &elants_ver_attr_fw_version.dattr.attr,
1061 &elants_ver_attr_hw_version.dattr.attr,
1062 &elants_ver_attr_test_version.dattr.attr,
1063 &elants_ver_attr_solution_version.dattr.attr,
1064 &elants_ver_attr_bc_version.dattr.attr,
1065 &elants_ver_attr_iap_version.dattr.attr,
1066 NULL
1067 };
1068
1069 static struct attribute_group elants_attribute_group = {
1070 .attrs = elants_attributes,
1071 };
1072
1073 static void elants_i2c_remove_sysfs_group(void *_data)
1074 {
1075 struct elants_data *ts = _data;
1076
1077 sysfs_remove_group(&ts->client->dev.kobj, &elants_attribute_group);
1078 }
1079
1080 static int elants_i2c_power_on(struct elants_data *ts)
1081 {
1082 int error;
1083
1084 /*
1085 * If we do not have reset gpio assume platform firmware
1086 * controls regulators and does power them on for us.
1087 */
1088 if (IS_ERR_OR_NULL(ts->reset_gpio))
1089 return 0;
1090
1091 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1092
1093 error = regulator_enable(ts->vcc33);
1094 if (error) {
1095 dev_err(&ts->client->dev,
1096 "failed to enable vcc33 regulator: %d\n",
1097 error);
1098 goto release_reset_gpio;
1099 }
1100
1101 error = regulator_enable(ts->vccio);
1102 if (error) {
1103 dev_err(&ts->client->dev,
1104 "failed to enable vccio regulator: %d\n",
1105 error);
1106 regulator_disable(ts->vcc33);
1107 goto release_reset_gpio;
1108 }
1109
1110 /*
1111 * We need to wait a bit after powering on controller before
1112 * we are allowed to release reset GPIO.
1113 */
1114 udelay(ELAN_POWERON_DELAY_USEC);
1115
1116 release_reset_gpio:
1117 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1118 if (error)
1119 return error;
1120
1121 msleep(ELAN_RESET_DELAY_MSEC);
1122
1123 return 0;
1124 }
1125
1126 static void elants_i2c_power_off(void *_data)
1127 {
1128 struct elants_data *ts = _data;
1129
1130 if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1131 /*
1132 * Activate reset gpio to prevent leakage through the
1133 * pin once we shut off power to the controller.
1134 */
1135 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1136 regulator_disable(ts->vccio);
1137 regulator_disable(ts->vcc33);
1138 }
1139 }
1140
1141 static int elants_i2c_probe(struct i2c_client *client,
1142 const struct i2c_device_id *id)
1143 {
1144 union i2c_smbus_data dummy;
1145 struct elants_data *ts;
1146 unsigned long irqflags;
1147 int error;
1148
1149 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1150 dev_err(&client->dev,
1151 "%s: i2c check functionality error\n", DEVICE_NAME);
1152 return -ENXIO;
1153 }
1154
1155 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1156 if (!ts)
1157 return -ENOMEM;
1158
1159 mutex_init(&ts->sysfs_mutex);
1160 init_completion(&ts->cmd_done);
1161
1162 ts->client = client;
1163 i2c_set_clientdata(client, ts);
1164
1165 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1166 if (IS_ERR(ts->vcc33)) {
1167 error = PTR_ERR(ts->vcc33);
1168 if (error != -EPROBE_DEFER)
1169 dev_err(&client->dev,
1170 "Failed to get 'vcc33' regulator: %d\n",
1171 error);
1172 return error;
1173 }
1174
1175 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1176 if (IS_ERR(ts->vccio)) {
1177 error = PTR_ERR(ts->vccio);
1178 if (error != -EPROBE_DEFER)
1179 dev_err(&client->dev,
1180 "Failed to get 'vccio' regulator: %d\n",
1181 error);
1182 return error;
1183 }
1184
1185 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1186 if (IS_ERR(ts->reset_gpio)) {
1187 error = PTR_ERR(ts->reset_gpio);
1188
1189 if (error == -EPROBE_DEFER)
1190 return error;
1191
1192 if (error != -ENOENT && error != -ENOSYS) {
1193 dev_err(&client->dev,
1194 "failed to get reset gpio: %d\n",
1195 error);
1196 return error;
1197 }
1198
1199 ts->keep_power_in_suspend = true;
1200 }
1201
1202 error = elants_i2c_power_on(ts);
1203 if (error)
1204 return error;
1205
1206 error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1207 if (error) {
1208 dev_err(&client->dev,
1209 "failed to install power off action: %d\n", error);
1210 elants_i2c_power_off(ts);
1211 return error;
1212 }
1213
1214 /* Make sure there is something at this address */
1215 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1216 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1217 dev_err(&client->dev, "nothing at this address\n");
1218 return -ENXIO;
1219 }
1220
1221 error = elants_i2c_initialize(ts);
1222 if (error) {
1223 dev_err(&client->dev, "failed to initialize: %d\n", error);
1224 return error;
1225 }
1226
1227 ts->input = devm_input_allocate_device(&client->dev);
1228 if (!ts->input) {
1229 dev_err(&client->dev, "Failed to allocate input device\n");
1230 return -ENOMEM;
1231 }
1232
1233 ts->input->name = "Elan Touchscreen";
1234 ts->input->id.bustype = BUS_I2C;
1235
1236 __set_bit(BTN_TOUCH, ts->input->keybit);
1237 __set_bit(EV_ABS, ts->input->evbit);
1238 __set_bit(EV_KEY, ts->input->evbit);
1239
1240 /* Single touch input params setup */
1241 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
1242 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
1243 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
1244 input_abs_set_res(ts->input, ABS_X, ts->x_res);
1245 input_abs_set_res(ts->input, ABS_Y, ts->y_res);
1246
1247 /* Multitouch input params setup */
1248 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1249 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1250 if (error) {
1251 dev_err(&client->dev,
1252 "failed to initialize MT slots: %d\n", error);
1253 return error;
1254 }
1255
1256 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1257 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1258 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1259 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1260 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1261 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1262
1263 error = input_register_device(ts->input);
1264 if (error) {
1265 dev_err(&client->dev,
1266 "unable to register input device: %d\n", error);
1267 return error;
1268 }
1269
1270 /*
1271 * Systems using device tree should set up interrupt via DTS,
1272 * the rest will use the default falling edge interrupts.
1273 */
1274 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1275
1276 error = devm_request_threaded_irq(&client->dev, client->irq,
1277 NULL, elants_i2c_irq,
1278 irqflags | IRQF_ONESHOT,
1279 client->name, ts);
1280 if (error) {
1281 dev_err(&client->dev, "Failed to register interrupt\n");
1282 return error;
1283 }
1284
1285 /*
1286 * Systems using device tree should set up wakeup via DTS,
1287 * the rest will configure device as wakeup source by default.
1288 */
1289 if (!client->dev.of_node)
1290 device_init_wakeup(&client->dev, true);
1291
1292 error = sysfs_create_group(&client->dev.kobj, &elants_attribute_group);
1293 if (error) {
1294 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1295 error);
1296 return error;
1297 }
1298
1299 error = devm_add_action(&client->dev,
1300 elants_i2c_remove_sysfs_group, ts);
1301 if (error) {
1302 elants_i2c_remove_sysfs_group(ts);
1303 dev_err(&client->dev,
1304 "Failed to add sysfs cleanup action: %d\n",
1305 error);
1306 return error;
1307 }
1308
1309 return 0;
1310 }
1311
1312 static int __maybe_unused elants_i2c_suspend(struct device *dev)
1313 {
1314 struct i2c_client *client = to_i2c_client(dev);
1315 struct elants_data *ts = i2c_get_clientdata(client);
1316 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1317 int retry_cnt;
1318 int error;
1319
1320 /* Command not support in IAP recovery mode */
1321 if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1322 return -EBUSY;
1323
1324 disable_irq(client->irq);
1325
1326 if (device_may_wakeup(dev)) {
1327 /*
1328 * The device will automatically enter idle mode
1329 * that has reduced power consumption.
1330 */
1331 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1332 } else if (ts->keep_power_in_suspend) {
1333 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1334 error = elants_i2c_send(client, set_sleep_cmd,
1335 sizeof(set_sleep_cmd));
1336 if (!error)
1337 break;
1338
1339 dev_err(&client->dev,
1340 "suspend command failed: %d\n", error);
1341 }
1342 } else {
1343 elants_i2c_power_off(ts);
1344 }
1345
1346 return 0;
1347 }
1348
1349 static int __maybe_unused elants_i2c_resume(struct device *dev)
1350 {
1351 struct i2c_client *client = to_i2c_client(dev);
1352 struct elants_data *ts = i2c_get_clientdata(client);
1353 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1354 int retry_cnt;
1355 int error;
1356
1357 if (device_may_wakeup(dev)) {
1358 if (ts->wake_irq_enabled)
1359 disable_irq_wake(client->irq);
1360 elants_i2c_sw_reset(client);
1361 } else if (ts->keep_power_in_suspend) {
1362 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1363 error = elants_i2c_send(client, set_active_cmd,
1364 sizeof(set_active_cmd));
1365 if (!error)
1366 break;
1367
1368 dev_err(&client->dev,
1369 "resume command failed: %d\n", error);
1370 }
1371 } else {
1372 elants_i2c_power_on(ts);
1373 elants_i2c_initialize(ts);
1374 }
1375
1376 ts->state = ELAN_STATE_NORMAL;
1377 enable_irq(client->irq);
1378
1379 return 0;
1380 }
1381
1382 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1383 elants_i2c_suspend, elants_i2c_resume);
1384
1385 static const struct i2c_device_id elants_i2c_id[] = {
1386 { DEVICE_NAME, 0 },
1387 { }
1388 };
1389 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1390
1391 #ifdef CONFIG_ACPI
1392 static const struct acpi_device_id elants_acpi_id[] = {
1393 { "ELAN0001", 0 },
1394 { }
1395 };
1396 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1397 #endif
1398
1399 #ifdef CONFIG_OF
1400 static const struct of_device_id elants_of_match[] = {
1401 { .compatible = "elan,ekth3500" },
1402 { /* sentinel */ }
1403 };
1404 MODULE_DEVICE_TABLE(of, elants_of_match);
1405 #endif
1406
1407 static struct i2c_driver elants_i2c_driver = {
1408 .probe = elants_i2c_probe,
1409 .id_table = elants_i2c_id,
1410 .driver = {
1411 .name = DEVICE_NAME,
1412 .pm = &elants_i2c_pm_ops,
1413 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1414 .of_match_table = of_match_ptr(elants_of_match),
1415 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1416 },
1417 };
1418 module_i2c_driver(elants_i2c_driver);
1419
1420 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1421 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1422 MODULE_VERSION(DRV_VERSION);
1423 MODULE_LICENSE("GPL");
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