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Linux 5.1.15
[linux/fpc-iii.git] / drivers / input / touchscreen / elants_i2c.c
blobf2cb2312183393f3e3f9ebd774f2d776e67f7043
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/irq.h>
31 #include <linux/platform_device.h>
32 #include <linux/async.h>
33 #include <linux/i2c.h>
34 #include <linux/delay.h>
35 #include <linux/uaccess.h>
36 #include <linux/buffer_head.h>
37 #include <linux/slab.h>
38 #include <linux/firmware.h>
39 #include <linux/input/mt.h>
40 #include <linux/acpi.h>
41 #include <linux/of.h>
42 #include <linux/gpio/consumer.h>
43 #include <linux/regulator/consumer.h>
44 #include <asm/unaligned.h>
45
46 /* Device, Driver information */
47 #define DEVICE_NAME "elants_i2c"
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 bool wake_irq_enabled;
151 bool keep_power_in_suspend;
152
153 /* Must be last to be used for DMA operations */
154 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
155 };
156
157 static int elants_i2c_send(struct i2c_client *client,
158 const void *data, size_t size)
159 {
160 int ret;
161
162 ret = i2c_master_send(client, data, size);
163 if (ret == size)
164 return 0;
165
166 if (ret >= 0)
167 ret = -EIO;
168
169 dev_err(&client->dev, "%s failed (%*ph): %d\n",
170 __func__, (int)size, data, ret);
171
172 return ret;
173 }
174
175 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
176 {
177 int ret;
178
179 ret = i2c_master_recv(client, data, size);
180 if (ret == size)
181 return 0;
182
183 if (ret >= 0)
184 ret = -EIO;
185
186 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
187
188 return ret;
189 }
190
191 static int elants_i2c_execute_command(struct i2c_client *client,
192 const u8 *cmd, size_t cmd_size,
193 u8 *resp, size_t resp_size)
194 {
195 struct i2c_msg msgs[2];
196 int ret;
197 u8 expected_response;
198
199 switch (cmd[0]) {
200 case CMD_HEADER_READ:
201 expected_response = CMD_HEADER_RESP;
202 break;
203
204 case CMD_HEADER_6B_READ:
205 expected_response = CMD_HEADER_6B_RESP;
206 break;
207
208 default:
209 dev_err(&client->dev, "%s: invalid command %*ph\n",
210 __func__, (int)cmd_size, cmd);
211 return -EINVAL;
212 }
213
214 msgs[0].addr = client->addr;
215 msgs[0].flags = client->flags & I2C_M_TEN;
216 msgs[0].len = cmd_size;
217 msgs[0].buf = (u8 *)cmd;
218
219 msgs[1].addr = client->addr;
220 msgs[1].flags = client->flags & I2C_M_TEN;
221 msgs[1].flags |= I2C_M_RD;
222 msgs[1].len = resp_size;
223 msgs[1].buf = resp;
224
225 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
226 if (ret < 0)
227 return ret;
228
229 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
230 return -EIO;
231
232 return 0;
233 }
234
235 static int elants_i2c_calibrate(struct elants_data *ts)
236 {
237 struct i2c_client *client = ts->client;
238 int ret, error;
239 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
240 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
241 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
242
243 disable_irq(client->irq);
244
245 ts->state = ELAN_WAIT_RECALIBRATION;
246 reinit_completion(&ts->cmd_done);
247
248 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
249 elants_i2c_send(client, rek, sizeof(rek));
250
251 enable_irq(client->irq);
252
253 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
254 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
255
256 ts->state = ELAN_STATE_NORMAL;
257
258 if (ret <= 0) {
259 error = ret < 0 ? ret : -ETIMEDOUT;
260 dev_err(&client->dev,
261 "error while waiting for calibration to complete: %d\n",
262 error);
263 return error;
264 }
265
266 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
267 dev_err(&client->dev,
268 "unexpected calibration response: %*ph\n",
269 (int)sizeof(ts->cmd_resp), ts->cmd_resp);
270 return -EINVAL;
271 }
272
273 return 0;
274 }
275
276 static int elants_i2c_sw_reset(struct i2c_client *client)
277 {
278 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
279 int error;
280
281 error = elants_i2c_send(client, soft_rst_cmd,
282 sizeof(soft_rst_cmd));
283 if (error) {
284 dev_err(&client->dev, "software reset failed: %d\n", error);
285 return error;
286 }
287
288 /*
289 * We should wait at least 10 msec (but no more than 40) before
290 * sending fastboot or IAP command to the device.
291 */
292 msleep(30);
293
294 return 0;
295 }
296
297 static u16 elants_i2c_parse_version(u8 *buf)
298 {
299 return get_unaligned_be32(buf) >> 4;
300 }
301
302 static int elants_i2c_query_hw_version(struct elants_data *ts)
303 {
304 struct i2c_client *client = ts->client;
305 int error, retry_cnt;
306 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
307 u8 resp[HEADER_SIZE];
308
309 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
310 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
311 resp, sizeof(resp));
312 if (!error) {
313 ts->hw_version = elants_i2c_parse_version(resp);
314 if (ts->hw_version != 0xffff)
315 return 0;
316 }
317
318 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
319 error, (int)sizeof(resp), resp);
320 }
321
322 if (error) {
323 dev_err(&client->dev,
324 "Failed to read fw id: %d\n", error);
325 return error;
326 }
327
328 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
329
330 return -EINVAL;
331 }
332
333 static int elants_i2c_query_fw_version(struct elants_data *ts)
334 {
335 struct i2c_client *client = ts->client;
336 int error, retry_cnt;
337 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
338 u8 resp[HEADER_SIZE];
339
340 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
341 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
342 resp, sizeof(resp));
343 if (!error) {
344 ts->fw_version = elants_i2c_parse_version(resp);
345 if (ts->fw_version != 0x0000 &&
346 ts->fw_version != 0xffff)
347 return 0;
348 }
349
350 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
351 error, (int)sizeof(resp), resp);
352 }
353
354 dev_err(&client->dev,
355 "Failed to read fw version or fw version is invalid\n");
356
357 return -EINVAL;
358 }
359
360 static int elants_i2c_query_test_version(struct elants_data *ts)
361 {
362 struct i2c_client *client = ts->client;
363 int error, retry_cnt;
364 u16 version;
365 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
366 u8 resp[HEADER_SIZE];
367
368 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
369 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
370 resp, sizeof(resp));
371 if (!error) {
372 version = elants_i2c_parse_version(resp);
373 ts->test_version = version >> 8;
374 ts->solution_version = version & 0xff;
375
376 return 0;
377 }
378
379 dev_dbg(&client->dev,
380 "read test version error rc=%d, buf=%*phC\n",
381 error, (int)sizeof(resp), resp);
382 }
383
384 dev_err(&client->dev, "Failed to read test version\n");
385
386 return -EINVAL;
387 }
388
389 static int elants_i2c_query_bc_version(struct elants_data *ts)
390 {
391 struct i2c_client *client = ts->client;
392 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
393 u8 resp[HEADER_SIZE];
394 u16 version;
395 int error;
396
397 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
398 resp, sizeof(resp));
399 if (error) {
400 dev_err(&client->dev,
401 "read BC version error=%d, buf=%*phC\n",
402 error, (int)sizeof(resp), resp);
403 return error;
404 }
405
406 version = elants_i2c_parse_version(resp);
407 ts->bc_version = version >> 8;
408 ts->iap_version = version & 0xff;
409
410 return 0;
411 }
412
413 static int elants_i2c_query_ts_info(struct elants_data *ts)
414 {
415 struct i2c_client *client = ts->client;
416 int error;
417 u8 resp[17];
418 u16 phy_x, phy_y, rows, cols, osr;
419 const u8 get_resolution_cmd[] = {
420 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
421 };
422 const u8 get_osr_cmd[] = {
423 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
424 };
425 const u8 get_physical_scan_cmd[] = {
426 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
427 };
428 const u8 get_physical_drive_cmd[] = {
429 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
430 };
431
432 /* Get trace number */
433 error = elants_i2c_execute_command(client,
434 get_resolution_cmd,
435 sizeof(get_resolution_cmd),
436 resp, sizeof(resp));
437 if (error) {
438 dev_err(&client->dev, "get resolution command failed: %d\n",
439 error);
440 return error;
441 }
442
443 rows = resp[2] + resp[6] + resp[10];
444 cols = resp[3] + resp[7] + resp[11];
445
446 /* Process mm_to_pixel information */
447 error = elants_i2c_execute_command(client,
448 get_osr_cmd, sizeof(get_osr_cmd),
449 resp, sizeof(resp));
450 if (error) {
451 dev_err(&client->dev, "get osr command failed: %d\n",
452 error);
453 return error;
454 }
455
456 osr = resp[3];
457
458 error = elants_i2c_execute_command(client,
459 get_physical_scan_cmd,
460 sizeof(get_physical_scan_cmd),
461 resp, sizeof(resp));
462 if (error) {
463 dev_err(&client->dev, "get physical scan command failed: %d\n",
464 error);
465 return error;
466 }
467
468 phy_x = get_unaligned_be16(&resp[2]);
469
470 error = elants_i2c_execute_command(client,
471 get_physical_drive_cmd,
472 sizeof(get_physical_drive_cmd),
473 resp, sizeof(resp));
474 if (error) {
475 dev_err(&client->dev, "get physical drive command failed: %d\n",
476 error);
477 return error;
478 }
479
480 phy_y = get_unaligned_be16(&resp[2]);
481
482 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
483
484 if (rows == 0 || cols == 0 || osr == 0) {
485 dev_warn(&client->dev,
486 "invalid trace number data: %d, %d, %d\n",
487 rows, cols, osr);
488 } else {
489 /* translate trace number to TS resolution */
490 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
491 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
492 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
493 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
494 }
495
496 return 0;
497 }
498
499 static int elants_i2c_fastboot(struct i2c_client *client)
500 {
501 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
502 int error;
503
504 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
505 if (error) {
506 dev_err(&client->dev, "boot failed: %d\n", error);
507 return error;
508 }
509
510 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
511 return 0;
512 }
513
514 static int elants_i2c_initialize(struct elants_data *ts)
515 {
516 struct i2c_client *client = ts->client;
517 int error, error2, retry_cnt;
518 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
519 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
520 u8 buf[HEADER_SIZE];
521
522 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
523 error = elants_i2c_sw_reset(client);
524 if (error) {
525 /* Continue initializing if it's the last try */
526 if (retry_cnt < MAX_RETRIES - 1)
527 continue;
528 }
529
530 error = elants_i2c_fastboot(client);
531 if (error) {
532 /* Continue initializing if it's the last try */
533 if (retry_cnt < MAX_RETRIES - 1)
534 continue;
535 }
536
537 /* Wait for Hello packet */
538 msleep(BOOT_TIME_DELAY_MS);
539
540 error = elants_i2c_read(client, buf, sizeof(buf));
541 if (error) {
542 dev_err(&client->dev,
543 "failed to read 'hello' packet: %d\n", error);
544 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
545 ts->iap_mode = ELAN_IAP_OPERATIONAL;
546 break;
547 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
548 /*
549 * Setting error code will mark device
550 * in recovery mode below.
551 */
552 error = -EIO;
553 break;
554 } else {
555 error = -EINVAL;
556 dev_err(&client->dev,
557 "invalid 'hello' packet: %*ph\n",
558 (int)sizeof(buf), buf);
559 }
560 }
561
562 /* hw version is available even if device in recovery state */
563 error2 = elants_i2c_query_hw_version(ts);
564 if (!error)
565 error = error2;
566
567 if (!error)
568 error = elants_i2c_query_fw_version(ts);
569 if (!error)
570 error = elants_i2c_query_test_version(ts);
571 if (!error)
572 error = elants_i2c_query_bc_version(ts);
573 if (!error)
574 error = elants_i2c_query_ts_info(ts);
575
576 if (error)
577 ts->iap_mode = ELAN_IAP_RECOVERY;
578
579 return 0;
580 }
581
582 /*
583 * Firmware update interface.
584 */
585
586 static int elants_i2c_fw_write_page(struct i2c_client *client,
587 const void *page)
588 {
589 const u8 ack_ok[] = { 0xaa, 0xaa };
590 u8 buf[2];
591 int retry;
592 int error;
593
594 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
595 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
596 if (error) {
597 dev_err(&client->dev,
598 "IAP Write Page failed: %d\n", error);
599 continue;
600 }
601
602 error = elants_i2c_read(client, buf, 2);
603 if (error) {
604 dev_err(&client->dev,
605 "IAP Ack read failed: %d\n", error);
606 return error;
607 }
608
609 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
610 return 0;
611
612 error = -EIO;
613 dev_err(&client->dev,
614 "IAP Get Ack Error [%02x:%02x]\n",
615 buf[0], buf[1]);
616 }
617
618 return error;
619 }
620
621 static int elants_i2c_do_update_firmware(struct i2c_client *client,
622 const struct firmware *fw,
623 bool force)
624 {
625 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
626 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
627 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
628 const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01};
629 u8 buf[HEADER_SIZE];
630 u16 send_id;
631 int page, n_fw_pages;
632 int error;
633
634 /* Recovery mode detection! */
635 if (force) {
636 dev_dbg(&client->dev, "Recovery mode procedure\n");
637 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
638 } else {
639 /* Start IAP Procedure */
640 dev_dbg(&client->dev, "Normal IAP procedure\n");
641 /* Close idle mode */
642 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
643 if (error)
644 dev_err(&client->dev, "Failed close idle: %d\n", error);
645 msleep(60);
646 elants_i2c_sw_reset(client);
647 msleep(20);
648 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
649 }
650
651 if (error) {
652 dev_err(&client->dev, "failed to enter IAP mode: %d\n", error);
653 return error;
654 }
655
656 msleep(20);
657
658 /* check IAP state */
659 error = elants_i2c_read(client, buf, 4);
660 if (error) {
661 dev_err(&client->dev,
662 "failed to read IAP acknowledgement: %d\n",
663 error);
664 return error;
665 }
666
667 if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
668 dev_err(&client->dev,
669 "failed to enter IAP: %*ph (expected %*ph)\n",
670 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
671 return -EIO;
672 }
673
674 dev_info(&client->dev, "successfully entered IAP mode");
675
676 send_id = client->addr;
677 error = elants_i2c_send(client, &send_id, 1);
678 if (error) {
679 dev_err(&client->dev, "sending dummy byte failed: %d\n",
680 error);
681 return error;
682 }
683
684 /* Clear the last page of Master */
685 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
686 if (error) {
687 dev_err(&client->dev, "clearing of the last page failed: %d\n",
688 error);
689 return error;
690 }
691
692 error = elants_i2c_read(client, buf, 2);
693 if (error) {
694 dev_err(&client->dev,
695 "failed to read ACK for clearing the last page: %d\n",
696 error);
697 return error;
698 }
699
700 n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
701 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
702
703 for (page = 0; page < n_fw_pages; page++) {
704 error = elants_i2c_fw_write_page(client,
705 fw->data + page * ELAN_FW_PAGESIZE);
706 if (error) {
707 dev_err(&client->dev,
708 "failed to write FW page %d: %d\n",
709 page, error);
710 return error;
711 }
712 }
713
714 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
715 msleep(300);
716
717 dev_info(&client->dev, "firmware update completed\n");
718 return 0;
719 }
720
721 static int elants_i2c_fw_update(struct elants_data *ts)
722 {
723 struct i2c_client *client = ts->client;
724 const struct firmware *fw;
725 char *fw_name;
726 int error;
727
728 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
729 if (!fw_name)
730 return -ENOMEM;
731
732 dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
733 error = request_firmware(&fw, fw_name, &client->dev);
734 kfree(fw_name);
735 if (error) {
736 dev_err(&client->dev, "failed to request firmware: %d\n",
737 error);
738 return error;
739 }
740
741 if (fw->size % ELAN_FW_PAGESIZE) {
742 dev_err(&client->dev, "invalid firmware length: %zu\n",
743 fw->size);
744 error = -EINVAL;
745 goto out;
746 }
747
748 disable_irq(client->irq);
749
750 error = elants_i2c_do_update_firmware(client, fw,
751 ts->iap_mode == ELAN_IAP_RECOVERY);
752 if (error) {
753 dev_err(&client->dev, "firmware update failed: %d\n", error);
754 ts->iap_mode = ELAN_IAP_RECOVERY;
755 goto out_enable_irq;
756 }
757
758 error = elants_i2c_initialize(ts);
759 if (error) {
760 dev_err(&client->dev,
761 "failed to initialize device after firmware update: %d\n",
762 error);
763 ts->iap_mode = ELAN_IAP_RECOVERY;
764 goto out_enable_irq;
765 }
766
767 ts->iap_mode = ELAN_IAP_OPERATIONAL;
768
769 out_enable_irq:
770 ts->state = ELAN_STATE_NORMAL;
771 enable_irq(client->irq);
772 msleep(100);
773
774 if (!error)
775 elants_i2c_calibrate(ts);
776 out:
777 release_firmware(fw);
778 return error;
779 }
780
781 /*
782 * Event reporting.
783 */
784
785 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
786 {
787 struct input_dev *input = ts->input;
788 unsigned int n_fingers;
789 u16 finger_state;
790 int i;
791
792 n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
793 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
794 buf[FW_POS_STATE];
795
796 dev_dbg(&ts->client->dev,
797 "n_fingers: %u, state: %04x\n", n_fingers, finger_state);
798
799 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
800 if (finger_state & 1) {
801 unsigned int x, y, p, w;
802 u8 *pos;
803
804 pos = &buf[FW_POS_XY + i * 3];
805 x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
806 y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
807 p = buf[FW_POS_PRESSURE + i];
808 w = buf[FW_POS_WIDTH + i];
809
810 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
811 i, x, y, p, w);
812
813 input_mt_slot(input, i);
814 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
815 input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
816 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
817 input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
818 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
819
820 n_fingers--;
821 }
822
823 finger_state >>= 1;
824 }
825
826 input_mt_sync_frame(input);
827 input_sync(input);
828 }
829
830 static u8 elants_i2c_calculate_checksum(u8 *buf)
831 {
832 u8 checksum = 0;
833 u8 i;
834
835 for (i = 0; i < FW_POS_CHECKSUM; i++)
836 checksum += buf[i];
837
838 return checksum;
839 }
840
841 static void elants_i2c_event(struct elants_data *ts, u8 *buf)
842 {
843 u8 checksum = elants_i2c_calculate_checksum(buf);
844
845 if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
846 dev_warn(&ts->client->dev,
847 "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
848 __func__, buf[FW_POS_HEADER],
849 checksum, buf[FW_POS_CHECKSUM]);
850 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
851 dev_warn(&ts->client->dev,
852 "%s: unknown packet type: %02x\n",
853 __func__, buf[FW_POS_HEADER]);
854 else
855 elants_i2c_mt_event(ts, buf);
856 }
857
858 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
859 {
860 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
861 struct elants_data *ts = _dev;
862 struct i2c_client *client = ts->client;
863 int report_count, report_len;
864 int i;
865 int len;
866
867 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
868 if (len < 0) {
869 dev_err(&client->dev, "%s: failed to read data: %d\n",
870 __func__, len);
871 goto out;
872 }
873
874 dev_dbg(&client->dev, "%s: packet %*ph\n",
875 __func__, HEADER_SIZE, ts->buf);
876
877 switch (ts->state) {
878 case ELAN_WAIT_RECALIBRATION:
879 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
880 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
881 complete(&ts->cmd_done);
882 ts->state = ELAN_STATE_NORMAL;
883 }
884 break;
885
886 case ELAN_WAIT_QUEUE_HEADER:
887 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
888 break;
889
890 ts->state = ELAN_STATE_NORMAL;
891 /* fall through */
892
893 case ELAN_STATE_NORMAL:
894
895 switch (ts->buf[FW_HDR_TYPE]) {
896 case CMD_HEADER_HELLO:
897 case CMD_HEADER_RESP:
898 case CMD_HEADER_REK:
899 break;
900
901 case QUEUE_HEADER_WAIT:
902 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
903 dev_err(&client->dev,
904 "invalid wait packet %*ph\n",
905 HEADER_SIZE, ts->buf);
906 } else {
907 ts->state = ELAN_WAIT_QUEUE_HEADER;
908 udelay(30);
909 }
910 break;
911
912 case QUEUE_HEADER_SINGLE:
913 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
914 break;
915
916 case QUEUE_HEADER_NORMAL:
917 report_count = ts->buf[FW_HDR_COUNT];
918 if (report_count == 0 || report_count > 3) {
919 dev_err(&client->dev,
920 "bad report count: %*ph\n",
921 HEADER_SIZE, ts->buf);
922 break;
923 }
924
925 report_len = ts->buf[FW_HDR_LENGTH] / report_count;
926 if (report_len != PACKET_SIZE) {
927 dev_err(&client->dev,
928 "mismatching report length: %*ph\n",
929 HEADER_SIZE, ts->buf);
930 break;
931 }
932
933 for (i = 0; i < report_count; i++) {
934 u8 *buf = ts->buf + HEADER_SIZE +
935 i * PACKET_SIZE;
936 elants_i2c_event(ts, buf);
937 }
938 break;
939
940 default:
941 dev_err(&client->dev, "unknown packet %*ph\n",
942 HEADER_SIZE, ts->buf);
943 break;
944 }
945 break;
946 }
947
948 out:
949 return IRQ_HANDLED;
950 }
951
952 /*
953 * sysfs interface
954 */
955 static ssize_t calibrate_store(struct device *dev,
956 struct device_attribute *attr,
957 const char *buf, size_t count)
958 {
959 struct i2c_client *client = to_i2c_client(dev);
960 struct elants_data *ts = i2c_get_clientdata(client);
961 int error;
962
963 error = mutex_lock_interruptible(&ts->sysfs_mutex);
964 if (error)
965 return error;
966
967 error = elants_i2c_calibrate(ts);
968
969 mutex_unlock(&ts->sysfs_mutex);
970 return error ?: count;
971 }
972
973 static ssize_t write_update_fw(struct device *dev,
974 struct device_attribute *attr,
975 const char *buf, size_t count)
976 {
977 struct i2c_client *client = to_i2c_client(dev);
978 struct elants_data *ts = i2c_get_clientdata(client);
979 int error;
980
981 error = mutex_lock_interruptible(&ts->sysfs_mutex);
982 if (error)
983 return error;
984
985 error = elants_i2c_fw_update(ts);
986 dev_dbg(dev, "firmware update result: %d\n", error);
987
988 mutex_unlock(&ts->sysfs_mutex);
989 return error ?: count;
990 }
991
992 static ssize_t show_iap_mode(struct device *dev,
993 struct device_attribute *attr, char *buf)
994 {
995 struct i2c_client *client = to_i2c_client(dev);
996 struct elants_data *ts = i2c_get_clientdata(client);
997
998 return sprintf(buf, "%s\n",
999 ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1000 "Normal" : "Recovery");
1001 }
1002
1003 static DEVICE_ATTR_WO(calibrate);
1004 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1005 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1006
1007 struct elants_version_attribute {
1008 struct device_attribute dattr;
1009 size_t field_offset;
1010 size_t field_size;
1011 };
1012
1013 #define __ELANTS_FIELD_SIZE(_field) \
1014 sizeof(((struct elants_data *)NULL)->_field)
1015 #define __ELANTS_VERIFY_SIZE(_field) \
1016 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \
1017 __ELANTS_FIELD_SIZE(_field))
1018 #define ELANTS_VERSION_ATTR(_field) \
1019 struct elants_version_attribute elants_ver_attr_##_field = { \
1020 .dattr = __ATTR(_field, S_IRUGO, \
1021 elants_version_attribute_show, NULL), \
1022 .field_offset = offsetof(struct elants_data, _field), \
1023 .field_size = __ELANTS_VERIFY_SIZE(_field), \
1024 }
1025
1026 static ssize_t elants_version_attribute_show(struct device *dev,
1027 struct device_attribute *dattr,
1028 char *buf)
1029 {
1030 struct i2c_client *client = to_i2c_client(dev);
1031 struct elants_data *ts = i2c_get_clientdata(client);
1032 struct elants_version_attribute *attr =
1033 container_of(dattr, struct elants_version_attribute, dattr);
1034 u8 *field = (u8 *)((char *)ts + attr->field_offset);
1035 unsigned int fmt_size;
1036 unsigned int val;
1037
1038 if (attr->field_size == 1) {
1039 val = *field;
1040 fmt_size = 2; /* 2 HEX digits */
1041 } else {
1042 val = *(u16 *)field;
1043 fmt_size = 4; /* 4 HEX digits */
1044 }
1045
1046 return sprintf(buf, "%0*x\n", fmt_size, val);
1047 }
1048
1049 static ELANTS_VERSION_ATTR(fw_version);
1050 static ELANTS_VERSION_ATTR(hw_version);
1051 static ELANTS_VERSION_ATTR(test_version);
1052 static ELANTS_VERSION_ATTR(solution_version);
1053 static ELANTS_VERSION_ATTR(bc_version);
1054 static ELANTS_VERSION_ATTR(iap_version);
1055
1056 static struct attribute *elants_attributes[] = {
1057 &dev_attr_calibrate.attr,
1058 &dev_attr_update_fw.attr,
1059 &dev_attr_iap_mode.attr,
1060
1061 &elants_ver_attr_fw_version.dattr.attr,
1062 &elants_ver_attr_hw_version.dattr.attr,
1063 &elants_ver_attr_test_version.dattr.attr,
1064 &elants_ver_attr_solution_version.dattr.attr,
1065 &elants_ver_attr_bc_version.dattr.attr,
1066 &elants_ver_attr_iap_version.dattr.attr,
1067 NULL
1068 };
1069
1070 static const struct attribute_group elants_attribute_group = {
1071 .attrs = elants_attributes,
1072 };
1073
1074 static int elants_i2c_power_on(struct elants_data *ts)
1075 {
1076 int error;
1077
1078 /*
1079 * If we do not have reset gpio assume platform firmware
1080 * controls regulators and does power them on for us.
1081 */
1082 if (IS_ERR_OR_NULL(ts->reset_gpio))
1083 return 0;
1084
1085 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1086
1087 error = regulator_enable(ts->vcc33);
1088 if (error) {
1089 dev_err(&ts->client->dev,
1090 "failed to enable vcc33 regulator: %d\n",
1091 error);
1092 goto release_reset_gpio;
1093 }
1094
1095 error = regulator_enable(ts->vccio);
1096 if (error) {
1097 dev_err(&ts->client->dev,
1098 "failed to enable vccio regulator: %d\n",
1099 error);
1100 regulator_disable(ts->vcc33);
1101 goto release_reset_gpio;
1102 }
1103
1104 /*
1105 * We need to wait a bit after powering on controller before
1106 * we are allowed to release reset GPIO.
1107 */
1108 udelay(ELAN_POWERON_DELAY_USEC);
1109
1110 release_reset_gpio:
1111 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1112 if (error)
1113 return error;
1114
1115 msleep(ELAN_RESET_DELAY_MSEC);
1116
1117 return 0;
1118 }
1119
1120 static void elants_i2c_power_off(void *_data)
1121 {
1122 struct elants_data *ts = _data;
1123
1124 if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1125 /*
1126 * Activate reset gpio to prevent leakage through the
1127 * pin once we shut off power to the controller.
1128 */
1129 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1130 regulator_disable(ts->vccio);
1131 regulator_disable(ts->vcc33);
1132 }
1133 }
1134
1135 static int elants_i2c_probe(struct i2c_client *client,
1136 const struct i2c_device_id *id)
1137 {
1138 union i2c_smbus_data dummy;
1139 struct elants_data *ts;
1140 unsigned long irqflags;
1141 int error;
1142
1143 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1144 dev_err(&client->dev,
1145 "%s: i2c check functionality error\n", DEVICE_NAME);
1146 return -ENXIO;
1147 }
1148
1149 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1150 if (!ts)
1151 return -ENOMEM;
1152
1153 mutex_init(&ts->sysfs_mutex);
1154 init_completion(&ts->cmd_done);
1155
1156 ts->client = client;
1157 i2c_set_clientdata(client, ts);
1158
1159 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1160 if (IS_ERR(ts->vcc33)) {
1161 error = PTR_ERR(ts->vcc33);
1162 if (error != -EPROBE_DEFER)
1163 dev_err(&client->dev,
1164 "Failed to get 'vcc33' regulator: %d\n",
1165 error);
1166 return error;
1167 }
1168
1169 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1170 if (IS_ERR(ts->vccio)) {
1171 error = PTR_ERR(ts->vccio);
1172 if (error != -EPROBE_DEFER)
1173 dev_err(&client->dev,
1174 "Failed to get 'vccio' regulator: %d\n",
1175 error);
1176 return error;
1177 }
1178
1179 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1180 if (IS_ERR(ts->reset_gpio)) {
1181 error = PTR_ERR(ts->reset_gpio);
1182
1183 if (error == -EPROBE_DEFER)
1184 return error;
1185
1186 if (error != -ENOENT && error != -ENOSYS) {
1187 dev_err(&client->dev,
1188 "failed to get reset gpio: %d\n",
1189 error);
1190 return error;
1191 }
1192
1193 ts->keep_power_in_suspend = true;
1194 }
1195
1196 error = elants_i2c_power_on(ts);
1197 if (error)
1198 return error;
1199
1200 error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1201 if (error) {
1202 dev_err(&client->dev,
1203 "failed to install power off action: %d\n", error);
1204 elants_i2c_power_off(ts);
1205 return error;
1206 }
1207
1208 /* Make sure there is something at this address */
1209 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1210 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1211 dev_err(&client->dev, "nothing at this address\n");
1212 return -ENXIO;
1213 }
1214
1215 error = elants_i2c_initialize(ts);
1216 if (error) {
1217 dev_err(&client->dev, "failed to initialize: %d\n", error);
1218 return error;
1219 }
1220
1221 ts->input = devm_input_allocate_device(&client->dev);
1222 if (!ts->input) {
1223 dev_err(&client->dev, "Failed to allocate input device\n");
1224 return -ENOMEM;
1225 }
1226
1227 ts->input->name = "Elan Touchscreen";
1228 ts->input->id.bustype = BUS_I2C;
1229
1230 __set_bit(BTN_TOUCH, ts->input->keybit);
1231 __set_bit(EV_ABS, ts->input->evbit);
1232 __set_bit(EV_KEY, ts->input->evbit);
1233
1234 /* Single touch input params setup */
1235 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
1236 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
1237 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
1238 input_abs_set_res(ts->input, ABS_X, ts->x_res);
1239 input_abs_set_res(ts->input, ABS_Y, ts->y_res);
1240
1241 /* Multitouch input params setup */
1242 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1243 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1244 if (error) {
1245 dev_err(&client->dev,
1246 "failed to initialize MT slots: %d\n", error);
1247 return error;
1248 }
1249
1250 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1251 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1252 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1253 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1254 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1255 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1256
1257 error = input_register_device(ts->input);
1258 if (error) {
1259 dev_err(&client->dev,
1260 "unable to register input device: %d\n", error);
1261 return error;
1262 }
1263
1264 /*
1265 * Platform code (ACPI, DTS) should normally set up interrupt
1266 * for us, but in case it did not let's fall back to using falling
1267 * edge to be compatible with older Chromebooks.
1268 */
1269 irqflags = irq_get_trigger_type(client->irq);
1270 if (!irqflags)
1271 irqflags = IRQF_TRIGGER_FALLING;
1272
1273 error = devm_request_threaded_irq(&client->dev, client->irq,
1274 NULL, elants_i2c_irq,
1275 irqflags | IRQF_ONESHOT,
1276 client->name, ts);
1277 if (error) {
1278 dev_err(&client->dev, "Failed to register interrupt\n");
1279 return error;
1280 }
1281
1282 /*
1283 * Systems using device tree should set up wakeup via DTS,
1284 * the rest will configure device as wakeup source by default.
1285 */
1286 if (!client->dev.of_node)
1287 device_init_wakeup(&client->dev, true);
1288
1289 error = devm_device_add_group(&client->dev, &elants_attribute_group);
1290 if (error) {
1291 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1292 error);
1293 return error;
1294 }
1295
1296 return 0;
1297 }
1298
1299 static int __maybe_unused elants_i2c_suspend(struct device *dev)
1300 {
1301 struct i2c_client *client = to_i2c_client(dev);
1302 struct elants_data *ts = i2c_get_clientdata(client);
1303 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1304 int retry_cnt;
1305 int error;
1306
1307 /* Command not support in IAP recovery mode */
1308 if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1309 return -EBUSY;
1310
1311 disable_irq(client->irq);
1312
1313 if (device_may_wakeup(dev)) {
1314 /*
1315 * The device will automatically enter idle mode
1316 * that has reduced power consumption.
1317 */
1318 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1319 } else if (ts->keep_power_in_suspend) {
1320 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1321 error = elants_i2c_send(client, set_sleep_cmd,
1322 sizeof(set_sleep_cmd));
1323 if (!error)
1324 break;
1325
1326 dev_err(&client->dev,
1327 "suspend command failed: %d\n", error);
1328 }
1329 } else {
1330 elants_i2c_power_off(ts);
1331 }
1332
1333 return 0;
1334 }
1335
1336 static int __maybe_unused elants_i2c_resume(struct device *dev)
1337 {
1338 struct i2c_client *client = to_i2c_client(dev);
1339 struct elants_data *ts = i2c_get_clientdata(client);
1340 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1341 int retry_cnt;
1342 int error;
1343
1344 if (device_may_wakeup(dev)) {
1345 if (ts->wake_irq_enabled)
1346 disable_irq_wake(client->irq);
1347 elants_i2c_sw_reset(client);
1348 } else if (ts->keep_power_in_suspend) {
1349 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1350 error = elants_i2c_send(client, set_active_cmd,
1351 sizeof(set_active_cmd));
1352 if (!error)
1353 break;
1354
1355 dev_err(&client->dev,
1356 "resume command failed: %d\n", error);
1357 }
1358 } else {
1359 elants_i2c_power_on(ts);
1360 elants_i2c_initialize(ts);
1361 }
1362
1363 ts->state = ELAN_STATE_NORMAL;
1364 enable_irq(client->irq);
1365
1366 return 0;
1367 }
1368
1369 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1370 elants_i2c_suspend, elants_i2c_resume);
1371
1372 static const struct i2c_device_id elants_i2c_id[] = {
1373 { DEVICE_NAME, 0 },
1374 { }
1375 };
1376 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1377
1378 #ifdef CONFIG_ACPI
1379 static const struct acpi_device_id elants_acpi_id[] = {
1380 { "ELAN0001", 0 },
1381 { }
1382 };
1383 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1384 #endif
1385
1386 #ifdef CONFIG_OF
1387 static const struct of_device_id elants_of_match[] = {
1388 { .compatible = "elan,ekth3500" },
1389 { /* sentinel */ }
1390 };
1391 MODULE_DEVICE_TABLE(of, elants_of_match);
1392 #endif
1393
1394 static struct i2c_driver elants_i2c_driver = {
1395 .probe = elants_i2c_probe,
1396 .id_table = elants_i2c_id,
1397 .driver = {
1398 .name = DEVICE_NAME,
1399 .pm = &elants_i2c_pm_ops,
1400 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1401 .of_match_table = of_match_ptr(elants_of_match),
1402 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1403 },
1404 };
1405 module_i2c_driver(elants_i2c_driver);
1406
1407 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1408 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1409 MODULE_LICENSE("GPL");
Linux with added FPC-III support