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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Elan Microelectronics touch panels with I2C interface
4 *
5 * Copyright (C) 2014 Elan Microelectronics Corporation.
6 * Scott Liu <scott.liu@emc.com.tw>
7 *
8 * This code is partly based on hid-multitouch.c:
9 *
10 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
11 * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
12 * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
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#include <linux/bits.h>
23#include <linux/module.h>
24#include <linux/input.h>
25#include <linux/interrupt.h>
26#include <linux/irq.h>
27#include <linux/platform_device.h>
28#include <linux/async.h>
29#include <linux/i2c.h>
30#include <linux/delay.h>
31#include <linux/uaccess.h>
32#include <linux/buffer_head.h>
33#include <linux/slab.h>
34#include <linux/firmware.h>
35#include <linux/input/mt.h>
36#include <linux/input/touchscreen.h>
37#include <linux/acpi.h>
38#include <linux/of.h>
39#include <linux/gpio/consumer.h>
40#include <linux/regulator/consumer.h>
41#include <asm/unaligned.h>
42
43/* Device, Driver information */
44#define DEVICE_NAME "elants_i2c"
45
46/* Convert from rows or columns into resolution */
47#define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m))
48
49/* FW header data */
50#define HEADER_SIZE 4
51#define FW_HDR_TYPE 0
52#define FW_HDR_COUNT 1
53#define FW_HDR_LENGTH 2
54
55/* Buffer mode Queue Header information */
56#define QUEUE_HEADER_SINGLE 0x62
57#define QUEUE_HEADER_NORMAL 0X63
58#define QUEUE_HEADER_WAIT 0x64
59
60/* Command header definition */
61#define CMD_HEADER_WRITE 0x54
62#define CMD_HEADER_READ 0x53
63#define CMD_HEADER_6B_READ 0x5B
64#define CMD_HEADER_ROM_READ 0x96
65#define CMD_HEADER_RESP 0x52
66#define CMD_HEADER_6B_RESP 0x9B
67#define CMD_HEADER_ROM_RESP 0x95
68#define CMD_HEADER_HELLO 0x55
69#define CMD_HEADER_REK 0x66
70
71/* FW position data */
72#define PACKET_SIZE 55
73#define MAX_CONTACT_NUM 10
74#define FW_POS_HEADER 0
75#define FW_POS_STATE 1
76#define FW_POS_TOTAL 2
77#define FW_POS_XY 3
78#define FW_POS_TOOL_TYPE 33
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_REK 0xE0
94#define E_ELAN_INFO_TEST_VER 0xE0
95#define E_ELAN_INFO_FW_ID 0xF0
96#define E_INFO_OSR 0xD6
97#define E_INFO_PHY_SCAN 0xD7
98#define E_INFO_PHY_DRIVER 0xD8
99
100#define MAX_RETRIES 3
101#define MAX_FW_UPDATE_RETRIES 30
102
103#define ELAN_FW_PAGESIZE 132
104
105/* calibration timeout definition */
106#define ELAN_CALI_TIMEOUT_MSEC 12000
107
108#define ELAN_POWERON_DELAY_USEC 500
109#define ELAN_RESET_DELAY_MSEC 20
110
111enum elants_state {
112 ELAN_STATE_NORMAL,
113 ELAN_WAIT_QUEUE_HEADER,
114 ELAN_WAIT_RECALIBRATION,
115};
116
117enum elants_iap_mode {
118 ELAN_IAP_OPERATIONAL,
119 ELAN_IAP_RECOVERY,
120};
121
122/* struct elants_data - represents state of Elan touchscreen device */
123struct elants_data {
124 struct i2c_client *client;
125 struct input_dev *input;
126
127 struct regulator *vcc33;
128 struct regulator *vccio;
129 struct gpio_desc *reset_gpio;
130
131 u16 fw_version;
132 u8 test_version;
133 u8 solution_version;
134 u8 bc_version;
135 u8 iap_version;
136 u16 hw_version;
137 unsigned int x_res; /* resolution in units/mm */
138 unsigned int y_res;
139 unsigned int x_max;
140 unsigned int y_max;
141 struct touchscreen_properties prop;
142
143 enum elants_state state;
144 enum elants_iap_mode iap_mode;
145
146 /* Guards against concurrent access to the device via sysfs */
147 struct mutex sysfs_mutex;
148
149 u8 cmd_resp[HEADER_SIZE];
150 struct completion cmd_done;
151
152 bool wake_irq_enabled;
153 bool keep_power_in_suspend;
154
155 /* Must be last to be used for DMA operations */
156 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
157};
158
159static int elants_i2c_send(struct i2c_client *client,
160 const void *data, size_t size)
161{
162 int ret;
163
164 ret = i2c_master_send(client, data, size);
165 if (ret == size)
166 return 0;
167
168 if (ret >= 0)
169 ret = -EIO;
170
171 dev_err(&client->dev, "%s failed (%*ph): %d\n",
172 __func__, (int)size, data, ret);
173
174 return ret;
175}
176
177static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
178{
179 int ret;
180
181 ret = i2c_master_recv(client, data, size);
182 if (ret == size)
183 return 0;
184
185 if (ret >= 0)
186 ret = -EIO;
187
188 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
189
190 return ret;
191}
192
193static int elants_i2c_execute_command(struct i2c_client *client,
194 const u8 *cmd, size_t cmd_size,
195 u8 *resp, size_t resp_size,
196 int retries, const char *cmd_name)
197{
198 struct i2c_msg msgs[2];
199 int ret;
200 u8 expected_response;
201
202 switch (cmd[0]) {
203 case CMD_HEADER_READ:
204 expected_response = CMD_HEADER_RESP;
205 break;
206
207 case CMD_HEADER_6B_READ:
208 expected_response = CMD_HEADER_6B_RESP;
209 break;
210
211 case CMD_HEADER_ROM_READ:
212 expected_response = CMD_HEADER_ROM_RESP;
213 break;
214
215 default:
216 dev_err(&client->dev, "(%s): invalid command: %*ph\n",
217 cmd_name, (int)cmd_size, cmd);
218 return -EINVAL;
219 }
220
221 for (;;) {
222 msgs[0].addr = client->addr;
223 msgs[0].flags = client->flags & I2C_M_TEN;
224 msgs[0].len = cmd_size;
225 msgs[0].buf = (u8 *)cmd;
226
227 msgs[1].addr = client->addr;
228 msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
229 msgs[1].flags |= I2C_M_RD;
230 msgs[1].len = resp_size;
231 msgs[1].buf = resp;
232
233 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
234 if (ret < 0) {
235 if (--retries > 0) {
236 dev_dbg(&client->dev,
237 "(%s) I2C transfer failed: %pe (retrying)\n",
238 cmd_name, ERR_PTR(ret));
239 continue;
240 }
241
242 dev_err(&client->dev,
243 "(%s) I2C transfer failed: %pe\n",
244 cmd_name, ERR_PTR(ret));
245 return ret;
246 }
247
248 if (ret != ARRAY_SIZE(msgs) ||
249 resp[FW_HDR_TYPE] != expected_response) {
250 if (--retries > 0) {
251 dev_dbg(&client->dev,
252 "(%s) unexpected response: %*ph (retrying)\n",
253 cmd_name, ret, resp);
254 continue;
255 }
256
257 dev_err(&client->dev,
258 "(%s) unexpected response: %*ph\n",
259 cmd_name, ret, resp);
260 return -EIO;
261 }
262
263 return 0;
264 }
265}
266
267static int elants_i2c_calibrate(struct elants_data *ts)
268{
269 struct i2c_client *client = ts->client;
270 int ret, error;
271 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
272 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
273 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
274
275 disable_irq(client->irq);
276
277 ts->state = ELAN_WAIT_RECALIBRATION;
278 reinit_completion(&ts->cmd_done);
279
280 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
281 elants_i2c_send(client, rek, sizeof(rek));
282
283 enable_irq(client->irq);
284
285 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
286 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
287
288 ts->state = ELAN_STATE_NORMAL;
289
290 if (ret <= 0) {
291 error = ret < 0 ? ret : -ETIMEDOUT;
292 dev_err(&client->dev,
293 "error while waiting for calibration to complete: %d\n",
294 error);
295 return error;
296 }
297
298 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
299 dev_err(&client->dev,
300 "unexpected calibration response: %*ph\n",
301 (int)sizeof(ts->cmd_resp), ts->cmd_resp);
302 return -EINVAL;
303 }
304
305 return 0;
306}
307
308static int elants_i2c_sw_reset(struct i2c_client *client)
309{
310 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
311 int error;
312
313 error = elants_i2c_send(client, soft_rst_cmd,
314 sizeof(soft_rst_cmd));
315 if (error) {
316 dev_err(&client->dev, "software reset failed: %d\n", error);
317 return error;
318 }
319
320 /*
321 * We should wait at least 10 msec (but no more than 40) before
322 * sending fastboot or IAP command to the device.
323 */
324 msleep(30);
325
326 return 0;
327}
328
329static u16 elants_i2c_parse_version(u8 *buf)
330{
331 return get_unaligned_be32(buf) >> 4;
332}
333
334static int elants_i2c_query_hw_version(struct elants_data *ts)
335{
336 struct i2c_client *client = ts->client;
337 int retry_cnt = MAX_RETRIES;
338 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
339 u8 resp[HEADER_SIZE];
340 int error;
341
342 while (retry_cnt--) {
343 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
344 resp, sizeof(resp), 1,
345 "read fw id");
346 if (error)
347 return error;
348
349 ts->hw_version = elants_i2c_parse_version(resp);
350 if (ts->hw_version != 0xffff)
351 return 0;
352 }
353
354 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
355
356 return -EINVAL;
357}
358
359static int elants_i2c_query_fw_version(struct elants_data *ts)
360{
361 struct i2c_client *client = ts->client;
362 int retry_cnt = MAX_RETRIES;
363 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
364 u8 resp[HEADER_SIZE];
365 int error;
366
367 while (retry_cnt--) {
368 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
369 resp, sizeof(resp), 1,
370 "read fw version");
371 if (error)
372 return error;
373
374 ts->fw_version = elants_i2c_parse_version(resp);
375 if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff)
376 return 0;
377
378 dev_dbg(&client->dev, "(read fw version) resp %*phC\n",
379 (int)sizeof(resp), resp);
380 }
381
382 dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version);
383
384 return -EINVAL;
385}
386
387static int elants_i2c_query_test_version(struct elants_data *ts)
388{
389 struct i2c_client *client = ts->client;
390 int error;
391 u16 version;
392 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
393 u8 resp[HEADER_SIZE];
394
395 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
396 resp, sizeof(resp), MAX_RETRIES,
397 "read test version");
398 if (error) {
399 dev_err(&client->dev, "Failed to read test version\n");
400 return error;
401 }
402
403 version = elants_i2c_parse_version(resp);
404 ts->test_version = version >> 8;
405 ts->solution_version = version & 0xff;
406
407 return 0;
408}
409
410static int elants_i2c_query_bc_version(struct elants_data *ts)
411{
412 struct i2c_client *client = ts->client;
413 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
414 u8 resp[HEADER_SIZE];
415 u16 version;
416 int error;
417
418 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
419 resp, sizeof(resp), 1,
420 "read BC version");
421 if (error)
422 return error;
423
424 version = elants_i2c_parse_version(resp);
425 ts->bc_version = version >> 8;
426 ts->iap_version = version & 0xff;
427
428 return 0;
429}
430
431static int elants_i2c_query_ts_info(struct elants_data *ts)
432{
433 struct i2c_client *client = ts->client;
434 int error;
435 u8 resp[17];
436 u16 phy_x, phy_y, rows, cols, osr;
437 const u8 get_resolution_cmd[] = {
438 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
439 };
440 const u8 get_osr_cmd[] = {
441 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
442 };
443 const u8 get_physical_scan_cmd[] = {
444 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
445 };
446 const u8 get_physical_drive_cmd[] = {
447 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
448 };
449
450 /* Get trace number */
451 error = elants_i2c_execute_command(client,
452 get_resolution_cmd,
453 sizeof(get_resolution_cmd),
454 resp, sizeof(resp), 1,
455 "get resolution");
456 if (error)
457 return error;
458
459 rows = resp[2] + resp[6] + resp[10];
460 cols = resp[3] + resp[7] + resp[11];
461
462 /* Process mm_to_pixel information */
463 error = elants_i2c_execute_command(client,
464 get_osr_cmd, sizeof(get_osr_cmd),
465 resp, sizeof(resp), 1, "get osr");
466 if (error)
467 return error;
468
469 osr = resp[3];
470
471 error = elants_i2c_execute_command(client,
472 get_physical_scan_cmd,
473 sizeof(get_physical_scan_cmd),
474 resp, sizeof(resp), 1,
475 "get physical scan");
476 if (error)
477 return error;
478
479 phy_x = get_unaligned_be16(&resp[2]);
480
481 error = elants_i2c_execute_command(client,
482 get_physical_drive_cmd,
483 sizeof(get_physical_drive_cmd),
484 resp, sizeof(resp), 1,
485 "get physical drive");
486 if (error)
487 return error;
488
489 phy_y = get_unaligned_be16(&resp[2]);
490
491 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
492
493 if (rows == 0 || cols == 0 || osr == 0) {
494 dev_warn(&client->dev,
495 "invalid trace number data: %d, %d, %d\n",
496 rows, cols, osr);
497 } else {
498 /* translate trace number to TS resolution */
499 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
500 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
501 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
502 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
503 }
504
505 return 0;
506}
507
508static int elants_i2c_fastboot(struct i2c_client *client)
509{
510 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
511 int error;
512
513 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
514 if (error) {
515 dev_err(&client->dev, "boot failed: %d\n", error);
516 return error;
517 }
518
519 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
520 return 0;
521}
522
523static int elants_i2c_initialize(struct elants_data *ts)
524{
525 struct i2c_client *client = ts->client;
526 int error, error2, retry_cnt;
527 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
528 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
529 u8 buf[HEADER_SIZE];
530
531 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
532 error = elants_i2c_sw_reset(client);
533 if (error) {
534 /* Continue initializing if it's the last try */
535 if (retry_cnt < MAX_RETRIES - 1)
536 continue;
537 }
538
539 error = elants_i2c_fastboot(client);
540 if (error) {
541 /* Continue initializing if it's the last try */
542 if (retry_cnt < MAX_RETRIES - 1)
543 continue;
544 }
545
546 /* Wait for Hello packet */
547 msleep(BOOT_TIME_DELAY_MS);
548
549 error = elants_i2c_read(client, buf, sizeof(buf));
550 if (error) {
551 dev_err(&client->dev,
552 "failed to read 'hello' packet: %d\n", error);
553 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
554 ts->iap_mode = ELAN_IAP_OPERATIONAL;
555 break;
556 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
557 /*
558 * Setting error code will mark device
559 * in recovery mode below.
560 */
561 error = -EIO;
562 break;
563 } else {
564 error = -EINVAL;
565 dev_err(&client->dev,
566 "invalid 'hello' packet: %*ph\n",
567 (int)sizeof(buf), buf);
568 }
569 }
570
571 /* hw version is available even if device in recovery state */
572 error2 = elants_i2c_query_hw_version(ts);
573 if (!error2)
574 error2 = elants_i2c_query_bc_version(ts);
575 if (!error)
576 error = error2;
577
578 if (!error)
579 error = elants_i2c_query_fw_version(ts);
580 if (!error)
581 error = elants_i2c_query_test_version(ts);
582 if (!error)
583 error = elants_i2c_query_ts_info(ts);
584
585 if (error)
586 ts->iap_mode = ELAN_IAP_RECOVERY;
587
588 return 0;
589}
590
591/*
592 * Firmware update interface.
593 */
594
595static int elants_i2c_fw_write_page(struct i2c_client *client,
596 const void *page)
597{
598 const u8 ack_ok[] = { 0xaa, 0xaa };
599 u8 buf[2];
600 int retry;
601 int error;
602
603 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
604 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
605 if (error) {
606 dev_err(&client->dev,
607 "IAP Write Page failed: %d\n", error);
608 continue;
609 }
610
611 error = elants_i2c_read(client, buf, 2);
612 if (error) {
613 dev_err(&client->dev,
614 "IAP Ack read failed: %d\n", error);
615 return error;
616 }
617
618 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
619 return 0;
620
621 error = -EIO;
622 dev_err(&client->dev,
623 "IAP Get Ack Error [%02x:%02x]\n",
624 buf[0], buf[1]);
625 }
626
627 return error;
628}
629
630static int elants_i2c_validate_remark_id(struct elants_data *ts,
631 const struct firmware *fw)
632{
633 struct i2c_client *client = ts->client;
634 int error;
635 const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 };
636 u8 resp[6] = { 0 };
637 u16 ts_remark_id = 0;
638 u16 fw_remark_id = 0;
639
640 /* Compare TS Remark ID and FW Remark ID */
641 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
642 resp, sizeof(resp),
643 1, "read Remark ID");
644 if (error)
645 return error;
646
647 ts_remark_id = get_unaligned_be16(&resp[3]);
648
649 fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
650
651 if (fw_remark_id != ts_remark_id) {
652 dev_err(&client->dev,
653 "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n",
654 ts_remark_id, fw_remark_id);
655 return -EINVAL;
656 }
657
658 return 0;
659}
660
661static int elants_i2c_do_update_firmware(struct i2c_client *client,
662 const struct firmware *fw,
663 bool force)
664{
665 struct elants_data *ts = i2c_get_clientdata(client);
666 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
667 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
668 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
669 const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
670 u8 buf[HEADER_SIZE];
671 u16 send_id;
672 int page, n_fw_pages;
673 int error;
674 bool check_remark_id = ts->iap_version >= 0x60;
675
676 /* Recovery mode detection! */
677 if (force) {
678 dev_dbg(&client->dev, "Recovery mode procedure\n");
679
680 if (check_remark_id) {
681 error = elants_i2c_validate_remark_id(ts, fw);
682 if (error)
683 return error;
684 }
685
686 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
687 if (error) {
688 dev_err(&client->dev, "failed to enter IAP mode: %d\n",
689 error);
690 return error;
691 }
692 } else {
693 /* Start IAP Procedure */
694 dev_dbg(&client->dev, "Normal IAP procedure\n");
695
696 /* Close idle mode */
697 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
698 if (error)
699 dev_err(&client->dev, "Failed close idle: %d\n", error);
700 msleep(60);
701
702 elants_i2c_sw_reset(client);
703 msleep(20);
704
705 if (check_remark_id) {
706 error = elants_i2c_validate_remark_id(ts, fw);
707 if (error)
708 return error;
709 }
710
711 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
712 if (error) {
713 dev_err(&client->dev, "failed to enter IAP mode: %d\n",
714 error);
715 return error;
716 }
717 }
718
719 msleep(20);
720
721 /* check IAP state */
722 error = elants_i2c_read(client, buf, 4);
723 if (error) {
724 dev_err(&client->dev,
725 "failed to read IAP acknowledgement: %d\n",
726 error);
727 return error;
728 }
729
730 if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
731 dev_err(&client->dev,
732 "failed to enter IAP: %*ph (expected %*ph)\n",
733 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
734 return -EIO;
735 }
736
737 dev_info(&client->dev, "successfully entered IAP mode");
738
739 send_id = client->addr;
740 error = elants_i2c_send(client, &send_id, 1);
741 if (error) {
742 dev_err(&client->dev, "sending dummy byte failed: %d\n",
743 error);
744 return error;
745 }
746
747 /* Clear the last page of Master */
748 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
749 if (error) {
750 dev_err(&client->dev, "clearing of the last page failed: %d\n",
751 error);
752 return error;
753 }
754
755 error = elants_i2c_read(client, buf, 2);
756 if (error) {
757 dev_err(&client->dev,
758 "failed to read ACK for clearing the last page: %d\n",
759 error);
760 return error;
761 }
762
763 n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
764 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
765
766 for (page = 0; page < n_fw_pages; page++) {
767 error = elants_i2c_fw_write_page(client,
768 fw->data + page * ELAN_FW_PAGESIZE);
769 if (error) {
770 dev_err(&client->dev,
771 "failed to write FW page %d: %d\n",
772 page, error);
773 return error;
774 }
775 }
776
777 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
778 msleep(300);
779
780 dev_info(&client->dev, "firmware update completed\n");
781 return 0;
782}
783
784static int elants_i2c_fw_update(struct elants_data *ts)
785{
786 struct i2c_client *client = ts->client;
787 const struct firmware *fw;
788 char *fw_name;
789 int error;
790
791 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
792 if (!fw_name)
793 return -ENOMEM;
794
795 dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
796 error = request_firmware(&fw, fw_name, &client->dev);
797 kfree(fw_name);
798 if (error) {
799 dev_err(&client->dev, "failed to request firmware: %d\n",
800 error);
801 return error;
802 }
803
804 if (fw->size % ELAN_FW_PAGESIZE) {
805 dev_err(&client->dev, "invalid firmware length: %zu\n",
806 fw->size);
807 error = -EINVAL;
808 goto out;
809 }
810
811 disable_irq(client->irq);
812
813 error = elants_i2c_do_update_firmware(client, fw,
814 ts->iap_mode == ELAN_IAP_RECOVERY);
815 if (error) {
816 dev_err(&client->dev, "firmware update failed: %d\n", error);
817 ts->iap_mode = ELAN_IAP_RECOVERY;
818 goto out_enable_irq;
819 }
820
821 error = elants_i2c_initialize(ts);
822 if (error) {
823 dev_err(&client->dev,
824 "failed to initialize device after firmware update: %d\n",
825 error);
826 ts->iap_mode = ELAN_IAP_RECOVERY;
827 goto out_enable_irq;
828 }
829
830 ts->iap_mode = ELAN_IAP_OPERATIONAL;
831
832out_enable_irq:
833 ts->state = ELAN_STATE_NORMAL;
834 enable_irq(client->irq);
835 msleep(100);
836
837 if (!error)
838 elants_i2c_calibrate(ts);
839out:
840 release_firmware(fw);
841 return error;
842}
843
844/*
845 * Event reporting.
846 */
847
848static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
849{
850 struct input_dev *input = ts->input;
851 unsigned int n_fingers;
852 unsigned int tool_type;
853 u16 finger_state;
854 int i;
855
856 n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
857 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
858 buf[FW_POS_STATE];
859
860 dev_dbg(&ts->client->dev,
861 "n_fingers: %u, state: %04x\n", n_fingers, finger_state);
862
863 /* Note: all fingers have the same tool type */
864 tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
865 MT_TOOL_FINGER : MT_TOOL_PALM;
866
867 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
868 if (finger_state & 1) {
869 unsigned int x, y, p, w;
870 u8 *pos;
871
872 pos = &buf[FW_POS_XY + i * 3];
873 x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
874 y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
875 p = buf[FW_POS_PRESSURE + i];
876 w = buf[FW_POS_WIDTH + i];
877
878 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
879 i, x, y, p, w);
880
881 input_mt_slot(input, i);
882 input_mt_report_slot_state(input, tool_type, true);
883 touchscreen_report_pos(input, &ts->prop, x, y, true);
884 input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
885 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
886
887 n_fingers--;
888 }
889
890 finger_state >>= 1;
891 }
892
893 input_mt_sync_frame(input);
894 input_sync(input);
895}
896
897static u8 elants_i2c_calculate_checksum(u8 *buf)
898{
899 u8 checksum = 0;
900 u8 i;
901
902 for (i = 0; i < FW_POS_CHECKSUM; i++)
903 checksum += buf[i];
904
905 return checksum;
906}
907
908static void elants_i2c_event(struct elants_data *ts, u8 *buf)
909{
910 u8 checksum = elants_i2c_calculate_checksum(buf);
911
912 if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
913 dev_warn(&ts->client->dev,
914 "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
915 __func__, buf[FW_POS_HEADER],
916 checksum, buf[FW_POS_CHECKSUM]);
917 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
918 dev_warn(&ts->client->dev,
919 "%s: unknown packet type: %02x\n",
920 __func__, buf[FW_POS_HEADER]);
921 else
922 elants_i2c_mt_event(ts, buf);
923}
924
925static irqreturn_t elants_i2c_irq(int irq, void *_dev)
926{
927 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
928 struct elants_data *ts = _dev;
929 struct i2c_client *client = ts->client;
930 int report_count, report_len;
931 int i;
932 int len;
933
934 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
935 if (len < 0) {
936 dev_err(&client->dev, "%s: failed to read data: %d\n",
937 __func__, len);
938 goto out;
939 }
940
941 dev_dbg(&client->dev, "%s: packet %*ph\n",
942 __func__, HEADER_SIZE, ts->buf);
943
944 switch (ts->state) {
945 case ELAN_WAIT_RECALIBRATION:
946 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
947 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
948 complete(&ts->cmd_done);
949 ts->state = ELAN_STATE_NORMAL;
950 }
951 break;
952
953 case ELAN_WAIT_QUEUE_HEADER:
954 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
955 break;
956
957 ts->state = ELAN_STATE_NORMAL;
958 fallthrough;
959
960 case ELAN_STATE_NORMAL:
961
962 switch (ts->buf[FW_HDR_TYPE]) {
963 case CMD_HEADER_HELLO:
964 case CMD_HEADER_RESP:
965 case CMD_HEADER_REK:
966 break;
967
968 case QUEUE_HEADER_WAIT:
969 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
970 dev_err(&client->dev,
971 "invalid wait packet %*ph\n",
972 HEADER_SIZE, ts->buf);
973 } else {
974 ts->state = ELAN_WAIT_QUEUE_HEADER;
975 udelay(30);
976 }
977 break;
978
979 case QUEUE_HEADER_SINGLE:
980 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
981 break;
982
983 case QUEUE_HEADER_NORMAL:
984 report_count = ts->buf[FW_HDR_COUNT];
985 if (report_count == 0 || report_count > 3) {
986 dev_err(&client->dev,
987 "bad report count: %*ph\n",
988 HEADER_SIZE, ts->buf);
989 break;
990 }
991
992 report_len = ts->buf[FW_HDR_LENGTH] / report_count;
993 if (report_len != PACKET_SIZE) {
994 dev_err(&client->dev,
995 "mismatching report length: %*ph\n",
996 HEADER_SIZE, ts->buf);
997 break;
998 }
999
1000 for (i = 0; i < report_count; i++) {
1001 u8 *buf = ts->buf + HEADER_SIZE +
1002 i * PACKET_SIZE;
1003 elants_i2c_event(ts, buf);
1004 }
1005 break;
1006
1007 default:
1008 dev_err(&client->dev, "unknown packet %*ph\n",
1009 HEADER_SIZE, ts->buf);
1010 break;
1011 }
1012 break;
1013 }
1014
1015out:
1016 return IRQ_HANDLED;
1017}
1018
1019/*
1020 * sysfs interface
1021 */
1022static ssize_t calibrate_store(struct device *dev,
1023 struct device_attribute *attr,
1024 const char *buf, size_t count)
1025{
1026 struct i2c_client *client = to_i2c_client(dev);
1027 struct elants_data *ts = i2c_get_clientdata(client);
1028 int error;
1029
1030 error = mutex_lock_interruptible(&ts->sysfs_mutex);
1031 if (error)
1032 return error;
1033
1034 error = elants_i2c_calibrate(ts);
1035
1036 mutex_unlock(&ts->sysfs_mutex);
1037 return error ?: count;
1038}
1039
1040static ssize_t write_update_fw(struct device *dev,
1041 struct device_attribute *attr,
1042 const char *buf, size_t count)
1043{
1044 struct i2c_client *client = to_i2c_client(dev);
1045 struct elants_data *ts = i2c_get_clientdata(client);
1046 int error;
1047
1048 error = mutex_lock_interruptible(&ts->sysfs_mutex);
1049 if (error)
1050 return error;
1051
1052 error = elants_i2c_fw_update(ts);
1053 dev_dbg(dev, "firmware update result: %d\n", error);
1054
1055 mutex_unlock(&ts->sysfs_mutex);
1056 return error ?: count;
1057}
1058
1059static ssize_t show_iap_mode(struct device *dev,
1060 struct device_attribute *attr, char *buf)
1061{
1062 struct i2c_client *client = to_i2c_client(dev);
1063 struct elants_data *ts = i2c_get_clientdata(client);
1064
1065 return sprintf(buf, "%s\n",
1066 ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1067 "Normal" : "Recovery");
1068}
1069
1070static ssize_t show_calibration_count(struct device *dev,
1071 struct device_attribute *attr, char *buf)
1072{
1073 struct i2c_client *client = to_i2c_client(dev);
1074 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 };
1075 u8 resp[HEADER_SIZE];
1076 u16 rek_count;
1077 int error;
1078
1079 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
1080 resp, sizeof(resp), 1,
1081 "read ReK status");
1082 if (error)
1083 return sprintf(buf, "%d\n", error);
1084
1085 rek_count = get_unaligned_be16(&resp[2]);
1086 return sprintf(buf, "0x%04x\n", rek_count);
1087}
1088
1089static DEVICE_ATTR_WO(calibrate);
1090static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1091static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL);
1092static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1093
1094struct elants_version_attribute {
1095 struct device_attribute dattr;
1096 size_t field_offset;
1097 size_t field_size;
1098};
1099
1100#define __ELANTS_FIELD_SIZE(_field) \
1101 sizeof(((struct elants_data *)NULL)->_field)
1102#define __ELANTS_VERIFY_SIZE(_field) \
1103 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \
1104 __ELANTS_FIELD_SIZE(_field))
1105#define ELANTS_VERSION_ATTR(_field) \
1106 struct elants_version_attribute elants_ver_attr_##_field = { \
1107 .dattr = __ATTR(_field, S_IRUGO, \
1108 elants_version_attribute_show, NULL), \
1109 .field_offset = offsetof(struct elants_data, _field), \
1110 .field_size = __ELANTS_VERIFY_SIZE(_field), \
1111 }
1112
1113static ssize_t elants_version_attribute_show(struct device *dev,
1114 struct device_attribute *dattr,
1115 char *buf)
1116{
1117 struct i2c_client *client = to_i2c_client(dev);
1118 struct elants_data *ts = i2c_get_clientdata(client);
1119 struct elants_version_attribute *attr =
1120 container_of(dattr, struct elants_version_attribute, dattr);
1121 u8 *field = (u8 *)((char *)ts + attr->field_offset);
1122 unsigned int fmt_size;
1123 unsigned int val;
1124
1125 if (attr->field_size == 1) {
1126 val = *field;
1127 fmt_size = 2; /* 2 HEX digits */
1128 } else {
1129 val = *(u16 *)field;
1130 fmt_size = 4; /* 4 HEX digits */
1131 }
1132
1133 return sprintf(buf, "%0*x\n", fmt_size, val);
1134}
1135
1136static ELANTS_VERSION_ATTR(fw_version);
1137static ELANTS_VERSION_ATTR(hw_version);
1138static ELANTS_VERSION_ATTR(test_version);
1139static ELANTS_VERSION_ATTR(solution_version);
1140static ELANTS_VERSION_ATTR(bc_version);
1141static ELANTS_VERSION_ATTR(iap_version);
1142
1143static struct attribute *elants_attributes[] = {
1144 &dev_attr_calibrate.attr,
1145 &dev_attr_update_fw.attr,
1146 &dev_attr_iap_mode.attr,
1147 &dev_attr_calibration_count.attr,
1148
1149 &elants_ver_attr_fw_version.dattr.attr,
1150 &elants_ver_attr_hw_version.dattr.attr,
1151 &elants_ver_attr_test_version.dattr.attr,
1152 &elants_ver_attr_solution_version.dattr.attr,
1153 &elants_ver_attr_bc_version.dattr.attr,
1154 &elants_ver_attr_iap_version.dattr.attr,
1155 NULL
1156};
1157
1158static const struct attribute_group elants_attribute_group = {
1159 .attrs = elants_attributes,
1160};
1161
1162static int elants_i2c_power_on(struct elants_data *ts)
1163{
1164 int error;
1165
1166 /*
1167 * If we do not have reset gpio assume platform firmware
1168 * controls regulators and does power them on for us.
1169 */
1170 if (IS_ERR_OR_NULL(ts->reset_gpio))
1171 return 0;
1172
1173 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1174
1175 error = regulator_enable(ts->vcc33);
1176 if (error) {
1177 dev_err(&ts->client->dev,
1178 "failed to enable vcc33 regulator: %d\n",
1179 error);
1180 goto release_reset_gpio;
1181 }
1182
1183 error = regulator_enable(ts->vccio);
1184 if (error) {
1185 dev_err(&ts->client->dev,
1186 "failed to enable vccio regulator: %d\n",
1187 error);
1188 regulator_disable(ts->vcc33);
1189 goto release_reset_gpio;
1190 }
1191
1192 /*
1193 * We need to wait a bit after powering on controller before
1194 * we are allowed to release reset GPIO.
1195 */
1196 udelay(ELAN_POWERON_DELAY_USEC);
1197
1198release_reset_gpio:
1199 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1200 if (error)
1201 return error;
1202
1203 msleep(ELAN_RESET_DELAY_MSEC);
1204
1205 return 0;
1206}
1207
1208static void elants_i2c_power_off(void *_data)
1209{
1210 struct elants_data *ts = _data;
1211
1212 if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1213 /*
1214 * Activate reset gpio to prevent leakage through the
1215 * pin once we shut off power to the controller.
1216 */
1217 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1218 regulator_disable(ts->vccio);
1219 regulator_disable(ts->vcc33);
1220 }
1221}
1222
1223static int elants_i2c_probe(struct i2c_client *client,
1224 const struct i2c_device_id *id)
1225{
1226 union i2c_smbus_data dummy;
1227 struct elants_data *ts;
1228 unsigned long irqflags;
1229 int error;
1230
1231 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1232 dev_err(&client->dev,
1233 "%s: i2c check functionality error\n", DEVICE_NAME);
1234 return -ENXIO;
1235 }
1236
1237 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1238 if (!ts)
1239 return -ENOMEM;
1240
1241 mutex_init(&ts->sysfs_mutex);
1242 init_completion(&ts->cmd_done);
1243
1244 ts->client = client;
1245 i2c_set_clientdata(client, ts);
1246
1247 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1248 if (IS_ERR(ts->vcc33)) {
1249 error = PTR_ERR(ts->vcc33);
1250 if (error != -EPROBE_DEFER)
1251 dev_err(&client->dev,
1252 "Failed to get 'vcc33' regulator: %d\n",
1253 error);
1254 return error;
1255 }
1256
1257 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1258 if (IS_ERR(ts->vccio)) {
1259 error = PTR_ERR(ts->vccio);
1260 if (error != -EPROBE_DEFER)
1261 dev_err(&client->dev,
1262 "Failed to get 'vccio' regulator: %d\n",
1263 error);
1264 return error;
1265 }
1266
1267 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
1268 if (IS_ERR(ts->reset_gpio)) {
1269 error = PTR_ERR(ts->reset_gpio);
1270
1271 if (error == -EPROBE_DEFER)
1272 return error;
1273
1274 if (error != -ENOENT && error != -ENOSYS) {
1275 dev_err(&client->dev,
1276 "failed to get reset gpio: %d\n",
1277 error);
1278 return error;
1279 }
1280
1281 ts->keep_power_in_suspend = true;
1282 }
1283
1284 error = elants_i2c_power_on(ts);
1285 if (error)
1286 return error;
1287
1288 error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1289 if (error) {
1290 dev_err(&client->dev,
1291 "failed to install power off action: %d\n", error);
1292 elants_i2c_power_off(ts);
1293 return error;
1294 }
1295
1296 /* Make sure there is something at this address */
1297 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1298 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1299 dev_err(&client->dev, "nothing at this address\n");
1300 return -ENXIO;
1301 }
1302
1303 error = elants_i2c_initialize(ts);
1304 if (error) {
1305 dev_err(&client->dev, "failed to initialize: %d\n", error);
1306 return error;
1307 }
1308
1309 ts->input = devm_input_allocate_device(&client->dev);
1310 if (!ts->input) {
1311 dev_err(&client->dev, "Failed to allocate input device\n");
1312 return -ENOMEM;
1313 }
1314
1315 ts->input->name = "Elan Touchscreen";
1316 ts->input->id.bustype = BUS_I2C;
1317
1318 /* Multitouch input params setup */
1319
1320 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1321 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1322 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1323 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1324 input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE,
1325 0, MT_TOOL_PALM, 0, 0);
1326 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1327 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1328
1329 touchscreen_parse_properties(ts->input, true, &ts->prop);
1330
1331 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1332 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1333 if (error) {
1334 dev_err(&client->dev,
1335 "failed to initialize MT slots: %d\n", error);
1336 return error;
1337 }
1338
1339 error = input_register_device(ts->input);
1340 if (error) {
1341 dev_err(&client->dev,
1342 "unable to register input device: %d\n", error);
1343 return error;
1344 }
1345
1346 /*
1347 * Platform code (ACPI, DTS) should normally set up interrupt
1348 * for us, but in case it did not let's fall back to using falling
1349 * edge to be compatible with older Chromebooks.
1350 */
1351 irqflags = irq_get_trigger_type(client->irq);
1352 if (!irqflags)
1353 irqflags = IRQF_TRIGGER_FALLING;
1354
1355 error = devm_request_threaded_irq(&client->dev, client->irq,
1356 NULL, elants_i2c_irq,
1357 irqflags | IRQF_ONESHOT,
1358 client->name, ts);
1359 if (error) {
1360 dev_err(&client->dev, "Failed to register interrupt\n");
1361 return error;
1362 }
1363
1364 /*
1365 * Systems using device tree should set up wakeup via DTS,
1366 * the rest will configure device as wakeup source by default.
1367 */
1368 if (!client->dev.of_node)
1369 device_init_wakeup(&client->dev, true);
1370
1371 error = devm_device_add_group(&client->dev, &elants_attribute_group);
1372 if (error) {
1373 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1374 error);
1375 return error;
1376 }
1377
1378 return 0;
1379}
1380
1381static int __maybe_unused elants_i2c_suspend(struct device *dev)
1382{
1383 struct i2c_client *client = to_i2c_client(dev);
1384 struct elants_data *ts = i2c_get_clientdata(client);
1385 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
1386 int retry_cnt;
1387 int error;
1388
1389 /* Command not support in IAP recovery mode */
1390 if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1391 return -EBUSY;
1392
1393 disable_irq(client->irq);
1394
1395 if (device_may_wakeup(dev)) {
1396 /*
1397 * The device will automatically enter idle mode
1398 * that has reduced power consumption.
1399 */
1400 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
1401 } else if (ts->keep_power_in_suspend) {
1402 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1403 error = elants_i2c_send(client, set_sleep_cmd,
1404 sizeof(set_sleep_cmd));
1405 if (!error)
1406 break;
1407
1408 dev_err(&client->dev,
1409 "suspend command failed: %d\n", error);
1410 }
1411 } else {
1412 elants_i2c_power_off(ts);
1413 }
1414
1415 return 0;
1416}
1417
1418static int __maybe_unused elants_i2c_resume(struct device *dev)
1419{
1420 struct i2c_client *client = to_i2c_client(dev);
1421 struct elants_data *ts = i2c_get_clientdata(client);
1422 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
1423 int retry_cnt;
1424 int error;
1425
1426 if (device_may_wakeup(dev)) {
1427 if (ts->wake_irq_enabled)
1428 disable_irq_wake(client->irq);
1429 elants_i2c_sw_reset(client);
1430 } else if (ts->keep_power_in_suspend) {
1431 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1432 error = elants_i2c_send(client, set_active_cmd,
1433 sizeof(set_active_cmd));
1434 if (!error)
1435 break;
1436
1437 dev_err(&client->dev,
1438 "resume command failed: %d\n", error);
1439 }
1440 } else {
1441 elants_i2c_power_on(ts);
1442 elants_i2c_initialize(ts);
1443 }
1444
1445 ts->state = ELAN_STATE_NORMAL;
1446 enable_irq(client->irq);
1447
1448 return 0;
1449}
1450
1451static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1452 elants_i2c_suspend, elants_i2c_resume);
1453
1454static const struct i2c_device_id elants_i2c_id[] = {
1455 { DEVICE_NAME, 0 },
1456 { }
1457};
1458MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1459
1460#ifdef CONFIG_ACPI
1461static const struct acpi_device_id elants_acpi_id[] = {
1462 { "ELAN0001", 0 },
1463 { }
1464};
1465MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1466#endif
1467
1468#ifdef CONFIG_OF
1469static const struct of_device_id elants_of_match[] = {
1470 { .compatible = "elan,ekth3500" },
1471 { /* sentinel */ }
1472};
1473MODULE_DEVICE_TABLE(of, elants_of_match);
1474#endif
1475
1476static struct i2c_driver elants_i2c_driver = {
1477 .probe = elants_i2c_probe,
1478 .id_table = elants_i2c_id,
1479 .driver = {
1480 .name = DEVICE_NAME,
1481 .pm = &elants_i2c_pm_ops,
1482 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1483 .of_match_table = of_match_ptr(elants_of_match),
1484 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1485 },
1486};
1487module_i2c_driver(elants_i2c_driver);
1488
1489MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1490MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1491MODULE_LICENSE("GPL");