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ac1dc6b2 1// SPDX-License-Identifier: GPL-2.0-only
66aee900
SL		 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 *
66aee900
SL		 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
66aee900 21
f27ad893 22#include <linux/bits.h>
66aee900
SL		 23#include <linux/module.h>
24#include <linux/input.h>
25#include <linux/interrupt.h>
4c83c071 26#include <linux/irq.h>
66aee900
SL		 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>
66aee900
SL		 33#include <linux/slab.h>
34#include <linux/firmware.h>
66aee900
SL		 35#include <linux/input/mt.h>
36#include <linux/acpi.h>
37#include <linux/of.h>
afe10358
DT		 38#include <linux/gpio/consumer.h>
39#include <linux/regulator/consumer.h>
66aee900
SL		 40#include <asm/unaligned.h>
41
42/* Device, Driver information */
43#define DEVICE_NAME "elants_i2c"
66aee900
SL		 44
45/* Convert from rows or columns into resolution */
46#define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m))
47
48/* FW header data */
49#define HEADER_SIZE 4
50#define FW_HDR_TYPE 0
51#define FW_HDR_COUNT 1
52#define FW_HDR_LENGTH 2
53
54/* Buffer mode Queue Header information */
55#define QUEUE_HEADER_SINGLE 0x62
56#define QUEUE_HEADER_NORMAL 0X63
57#define QUEUE_HEADER_WAIT 0x64
58
59/* Command header definition */
60#define CMD_HEADER_WRITE 0x54
61#define CMD_HEADER_READ 0x53
62#define CMD_HEADER_6B_READ 0x5B
f0b57e19 63#define CMD_HEADER_ROM_READ 0x96
66aee900
SL		 64#define CMD_HEADER_RESP 0x52
65#define CMD_HEADER_6B_RESP 0x9B
f0b57e19 66#define CMD_HEADER_ROM_RESP 0x95
66aee900
SL		 67#define CMD_HEADER_HELLO 0x55
68#define CMD_HEADER_REK 0x66
69
70/* FW position data */
71#define PACKET_SIZE 55
72#define MAX_CONTACT_NUM 10
73#define FW_POS_HEADER 0
74#define FW_POS_STATE 1
75#define FW_POS_TOTAL 2
76#define FW_POS_XY 3
f27ad893 77#define FW_POS_TOOL_TYPE 33
66aee900
SL		 78#define FW_POS_CHECKSUM 34
79#define FW_POS_WIDTH 35
80#define FW_POS_PRESSURE 45
81
82#define HEADER_REPORT_10_FINGER 0x62
83
84/* Header (4 bytes) plus 3 fill 10-finger packets */
85#define MAX_PACKET_SIZE 169
86
87#define BOOT_TIME_DELAY_MS 50
88
89/* FW read command, 0x53 0x?? 0x0, 0x01 */
90#define E_ELAN_INFO_FW_VER 0x00
91#define E_ELAN_INFO_BC_VER 0x10
cf520c64 92#define E_ELAN_INFO_REK 0xE0
66aee900
SL		 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
66aee900
SL		 103
104/* calibration timeout definition */
22c15e5e 105#define ELAN_CALI_TIMEOUT_MSEC 12000
66aee900 106
afe10358
DT		 107#define ELAN_POWERON_DELAY_USEC 500
108#define ELAN_RESET_DELAY_MSEC 20
109
66aee900
SL		 110enum elants_state {
111 ELAN_STATE_NORMAL,
112 ELAN_WAIT_QUEUE_HEADER,
113 ELAN_WAIT_RECALIBRATION,
114};
115
116enum elants_iap_mode {
117 ELAN_IAP_OPERATIONAL,
118 ELAN_IAP_RECOVERY,
119};
120
121/* struct elants_data - represents state of Elan touchscreen device */
122struct elants_data {
123 struct i2c_client *client;
124 struct input_dev *input;
125
afe10358
DT		 126 struct regulator *vcc33;
127 struct regulator *vccio;
128 struct gpio_desc *reset_gpio;
129
66aee900
SL		 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
66aee900 150 bool wake_irq_enabled;
afe10358 151 bool keep_power_in_suspend;
00f73f97
SB		 152
153 /* Must be last to be used for DMA operations */
154 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
66aee900
SL		 155};
156
157static 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
175static 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
191static 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
f0b57e19
JC		 208 case CMD_HEADER_ROM_READ:
209 expected_response = CMD_HEADER_ROM_RESP;
210 break;
211
66aee900
SL		 212 default:
213 dev_err(&client->dev, "%s: invalid command %*ph\n",
214 __func__, (int)cmd_size, cmd);
215 return -EINVAL;
216 }
217
218 msgs[0].addr = client->addr;
219 msgs[0].flags = client->flags & I2C_M_TEN;
220 msgs[0].len = cmd_size;
221 msgs[0].buf = (u8 *)cmd;
222
223 msgs[1].addr = client->addr;
224 msgs[1].flags = client->flags & I2C_M_TEN;
225 msgs[1].flags |= I2C_M_RD;
226 msgs[1].len = resp_size;
227 msgs[1].buf = resp;
228
229 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
230 if (ret < 0)
231 return ret;
232
233 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
234 return -EIO;
235
236 return 0;
237}
238
239static int elants_i2c_calibrate(struct elants_data *ts)
240{
241 struct i2c_client *client = ts->client;
242 int ret, error;
243 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
244 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
245 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
246
247 disable_irq(client->irq);
248
249 ts->state = ELAN_WAIT_RECALIBRATION;
250 reinit_completion(&ts->cmd_done);
251
252 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
253 elants_i2c_send(client, rek, sizeof(rek));
254
255 enable_irq(client->irq);
256
257 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
258 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
259
260 ts->state = ELAN_STATE_NORMAL;
261
262 if (ret <= 0) {
263 error = ret < 0 ? ret : -ETIMEDOUT;
264 dev_err(&client->dev,
265 "error while waiting for calibration to complete: %d\n",
266 error);
267 return error;
268 }
269
270 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
271 dev_err(&client->dev,
272 "unexpected calibration response: %*ph\n",
273 (int)sizeof(ts->cmd_resp), ts->cmd_resp);
274 return -EINVAL;
275 }
276
277 return 0;
278}
279
280static int elants_i2c_sw_reset(struct i2c_client *client)
281{
282 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
283 int error;
284
285 error = elants_i2c_send(client, soft_rst_cmd,
286 sizeof(soft_rst_cmd));
287 if (error) {
288 dev_err(&client->dev, "software reset failed: %d\n", error);
289 return error;
290 }
291
292 /*
293 * We should wait at least 10 msec (but no more than 40) before
294 * sending fastboot or IAP command to the device.
295 */
296 msleep(30);
297
298 return 0;
299}
300
301static u16 elants_i2c_parse_version(u8 *buf)
302{
303 return get_unaligned_be32(buf) >> 4;
304}
305
bc1d57fe 306static int elants_i2c_query_hw_version(struct elants_data *ts)
66aee900
SL		 307{
308 struct i2c_client *client = ts->client;
309 int error, retry_cnt;
310 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
311 u8 resp[HEADER_SIZE];
312
313 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
314 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
315 resp, sizeof(resp));
316 if (!error) {
317 ts->hw_version = elants_i2c_parse_version(resp);
318 if (ts->hw_version != 0xffff)
319 return 0;
320 }
321
322 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
323 error, (int)sizeof(resp), resp);
324 }
325
bc1d57fe
JC		 326 if (error) {
327 dev_err(&client->dev,
328 "Failed to read fw id: %d\n", error);
329 return error;
330 }
331
332 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
66aee900
SL		 333
334 return -EINVAL;
335}
336
337static int elants_i2c_query_fw_version(struct elants_data *ts)
338{
339 struct i2c_client *client = ts->client;
340 int error, retry_cnt;
341 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
342 u8 resp[HEADER_SIZE];
343
344 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
345 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
346 resp, sizeof(resp));
347 if (!error) {
348 ts->fw_version = elants_i2c_parse_version(resp);
349 if (ts->fw_version != 0x0000 &&
350 ts->fw_version != 0xffff)
351 return 0;
352 }
353
354 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
355 error, (int)sizeof(resp), resp);
356 }
357
358 dev_err(&client->dev,
359 "Failed to read fw version or fw version is invalid\n");
360
361 return -EINVAL;
362}
363
364static int elants_i2c_query_test_version(struct elants_data *ts)
365{
366 struct i2c_client *client = ts->client;
367 int error, retry_cnt;
368 u16 version;
369 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
370 u8 resp[HEADER_SIZE];
371
372 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
373 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
374 resp, sizeof(resp));
375 if (!error) {
376 version = elants_i2c_parse_version(resp);
377 ts->test_version = version >> 8;
378 ts->solution_version = version & 0xff;
379
380 return 0;
381 }
382
383 dev_dbg(&client->dev,
384 "read test version error rc=%d, buf=%*phC\n",
385 error, (int)sizeof(resp), resp);
386 }
387
388 dev_err(&client->dev, "Failed to read test version\n");
389
390 return -EINVAL;
391}
392
393static int elants_i2c_query_bc_version(struct elants_data *ts)
394{
395 struct i2c_client *client = ts->client;
396 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
397 u8 resp[HEADER_SIZE];
398 u16 version;
399 int error;
400
401 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
402 resp, sizeof(resp));
403 if (error) {
404 dev_err(&client->dev,
405 "read BC version error=%d, buf=%*phC\n",
406 error, (int)sizeof(resp), resp);
407 return error;
408 }
409
410 version = elants_i2c_parse_version(resp);
411 ts->bc_version = version >> 8;
412 ts->iap_version = version & 0xff;
413
414 return 0;
415}
416
417static int elants_i2c_query_ts_info(struct elants_data *ts)
418{
419 struct i2c_client *client = ts->client;
420 int error;
421 u8 resp[17];
422 u16 phy_x, phy_y, rows, cols, osr;
423 const u8 get_resolution_cmd[] = {
424 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
425 };
426 const u8 get_osr_cmd[] = {
427 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
428 };
429 const u8 get_physical_scan_cmd[] = {
430 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
431 };
432 const u8 get_physical_drive_cmd[] = {
433 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
434 };
435
436 /* Get trace number */
437 error = elants_i2c_execute_command(client,
438 get_resolution_cmd,
439 sizeof(get_resolution_cmd),
440 resp, sizeof(resp));
441 if (error) {
442 dev_err(&client->dev, "get resolution command failed: %d\n",
443 error);
444 return error;
445 }
446
447 rows = resp[2] + resp[6] + resp[10];
448 cols = resp[3] + resp[7] + resp[11];
449
450 /* Process mm_to_pixel information */
451 error = elants_i2c_execute_command(client,
452 get_osr_cmd, sizeof(get_osr_cmd),
453 resp, sizeof(resp));
454 if (error) {
455 dev_err(&client->dev, "get osr command failed: %d\n",
456 error);
457 return error;
458 }
459
460 osr = resp[3];
461
462 error = elants_i2c_execute_command(client,
463 get_physical_scan_cmd,
464 sizeof(get_physical_scan_cmd),
465 resp, sizeof(resp));
466 if (error) {
467 dev_err(&client->dev, "get physical scan command failed: %d\n",
468 error);
469 return error;
470 }
471
472 phy_x = get_unaligned_be16(&resp[2]);
473
474 error = elants_i2c_execute_command(client,
475 get_physical_drive_cmd,
476 sizeof(get_physical_drive_cmd),
477 resp, sizeof(resp));
478 if (error) {
479 dev_err(&client->dev, "get physical drive command failed: %d\n",
480 error);
481 return error;
482 }
483
484 phy_y = get_unaligned_be16(&resp[2]);
485
486 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
487
488 if (rows == 0 || cols == 0 || osr == 0) {
489 dev_warn(&client->dev,
490 "invalid trace number data: %d, %d, %d\n",
491 rows, cols, osr);
492 } else {
493 /* translate trace number to TS resolution */
494 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
495 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
496 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
497 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
498 }
499
500 return 0;
501}
502
503static int elants_i2c_fastboot(struct i2c_client *client)
504{
505 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
506 int error;
507
508 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
509 if (error) {
510 dev_err(&client->dev, "boot failed: %d\n", error);
511 return error;
512 }
513
514 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
515 return 0;
516}
517
518static int elants_i2c_initialize(struct elants_data *ts)
519{
520 struct i2c_client *client = ts->client;
bc1d57fe 521 int error, error2, retry_cnt;
66aee900
SL		 522 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
523 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
524 u8 buf[HEADER_SIZE];
525
526 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
527 error = elants_i2c_sw_reset(client);
528 if (error) {
529 /* Continue initializing if it's the last try */
530 if (retry_cnt < MAX_RETRIES - 1)
531 continue;
532 }
533
534 error = elants_i2c_fastboot(client);
535 if (error) {
536 /* Continue initializing if it's the last try */
537 if (retry_cnt < MAX_RETRIES - 1)
538 continue;
539 }
540
541 /* Wait for Hello packet */
542 msleep(BOOT_TIME_DELAY_MS);
543
544 error = elants_i2c_read(client, buf, sizeof(buf));
545 if (error) {
546 dev_err(&client->dev,
547 "failed to read 'hello' packet: %d\n", error);
548 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
549 ts->iap_mode = ELAN_IAP_OPERATIONAL;
550 break;
551 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
552 /*
553 * Setting error code will mark device
554 * in recovery mode below.
555 */
556 error = -EIO;
557 break;
558 } else {
559 error = -EINVAL;
560 dev_err(&client->dev,
561 "invalid 'hello' packet: %*ph\n",
562 (int)sizeof(buf), buf);
563 }
564 }
565
bc1d57fe
JC		 566 /* hw version is available even if device in recovery state */
567 error2 = elants_i2c_query_hw_version(ts);
f0b57e19
JC		 568 if (!error2)
569 error2 = elants_i2c_query_bc_version(ts);
66aee900 570 if (!error)
bc1d57fe
JC		 571 error = error2;
572
66aee900
SL		 573 if (!error)
574 error = elants_i2c_query_fw_version(ts);
bc1d57fe
JC		 575 if (!error)
576 error = elants_i2c_query_test_version(ts);
bc1d57fe
JC		 577 if (!error)
578 error = elants_i2c_query_ts_info(ts);
66aee900 579
bc1d57fe 580 if (error)
66aee900 581 ts->iap_mode = ELAN_IAP_RECOVERY;
66aee900
SL		 582
583 return 0;
584}
585
586/*
587 * Firmware update interface.
588 */
589
590static int elants_i2c_fw_write_page(struct i2c_client *client,
591 const void *page)
592{
593 const u8 ack_ok[] = { 0xaa, 0xaa };
594 u8 buf[2];
595 int retry;
596 int error;
597
598 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
599 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
600 if (error) {
601 dev_err(&client->dev,
602 "IAP Write Page failed: %d\n", error);
603 continue;
604 }
605
606 error = elants_i2c_read(client, buf, 2);
607 if (error) {
608 dev_err(&client->dev,
609 "IAP Ack read failed: %d\n", error);
610 return error;
611 }
612
613 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
614 return 0;
615
616 error = -EIO;
617 dev_err(&client->dev,
618 "IAP Get Ack Error [%02x:%02x]\n",
619 buf[0], buf[1]);
620 }
621
622 return error;
623}
624
f0b57e19
JC		 625static int elants_i2c_validate_remark_id(struct elants_data *ts,
626 const struct firmware *fw)
627{
628 struct i2c_client *client = ts->client;
629 int error;
630 const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 };
631 u8 resp[6] = { 0 };
632 u16 ts_remark_id = 0;
633 u16 fw_remark_id = 0;
634
635 /* Compare TS Remark ID and FW Remark ID */
636 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
637 resp, sizeof(resp));
638 if (error) {
639 dev_err(&client->dev, "failed to query Remark ID: %d\n", error);
640 return error;
641 }
642
643 ts_remark_id = get_unaligned_be16(&resp[3]);
644
645 fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
646
647 if (fw_remark_id != ts_remark_id) {
648 dev_err(&client->dev,
649 "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n",
650 ts_remark_id, fw_remark_id);
651 return -EINVAL;
652 }
653
654 return 0;
655}
656
66aee900
SL		 657static int elants_i2c_do_update_firmware(struct i2c_client *client,
658 const struct firmware *fw,
659 bool force)
660{
f0b57e19 661 struct elants_data *ts = i2c_get_clientdata(client);
66aee900
SL		 662 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
663 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
664 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
f0b57e19 665 const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
66aee900
SL		 666 u8 buf[HEADER_SIZE];
667 u16 send_id;
668 int page, n_fw_pages;
669 int error;
f0b57e19 670 bool check_remark_id = ts->iap_version >= 0x60;
66aee900
SL		 671
672 /* Recovery mode detection! */
673 if (force) {
674 dev_dbg(&client->dev, "Recovery mode procedure\n");
f0b57e19
JC		 675
676 if (check_remark_id) {
677 error = elants_i2c_validate_remark_id(ts, fw);
678 if (error)
679 return error;
680 }
681
66aee900 682 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
f0b57e19
JC		 683 if (error) {
684 dev_err(&client->dev, "failed to enter IAP mode: %d\n",
685 error);
686 return error;
687 }
66aee900
SL		 688 } else {
689 /* Start IAP Procedure */
690 dev_dbg(&client->dev, "Normal IAP procedure\n");
f0b57e19 691
6fd38502
JC		 692 /* Close idle mode */
693 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
694 if (error)
695 dev_err(&client->dev, "Failed close idle: %d\n", error);
696 msleep(60);
f0b57e19 697
66aee900 698 elants_i2c_sw_reset(client);
6fd38502 699 msleep(20);
66aee900 700
f0b57e19
JC		 701 if (check_remark_id) {
702 error = elants_i2c_validate_remark_id(ts, fw);
703 if (error)
704 return error;
705 }
706
707 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
708 if (error) {
709 dev_err(&client->dev, "failed to enter IAP mode: %d\n",
710 error);
711 return error;
712 }
66aee900
SL		 713 }
714
715 msleep(20);
716
717 /* check IAP state */
718 error = elants_i2c_read(client, buf, 4);
719 if (error) {
720 dev_err(&client->dev,
721 "failed to read IAP acknowledgement: %d\n",
722 error);
723 return error;
724 }
725
726 if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
727 dev_err(&client->dev,
728 "failed to enter IAP: %*ph (expected %*ph)\n",
729 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
730 return -EIO;
731 }
732
733 dev_info(&client->dev, "successfully entered IAP mode");
734
735 send_id = client->addr;
736 error = elants_i2c_send(client, &send_id, 1);
737 if (error) {
738 dev_err(&client->dev, "sending dummy byte failed: %d\n",
739 error);
740 return error;
741 }
742
743 /* Clear the last page of Master */
744 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
745 if (error) {
746 dev_err(&client->dev, "clearing of the last page failed: %d\n",
747 error);
748 return error;
749 }
750
751 error = elants_i2c_read(client, buf, 2);
752 if (error) {
753 dev_err(&client->dev,
754 "failed to read ACK for clearing the last page: %d\n",
755 error);
756 return error;
757 }
758
759 n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
760 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
761
762 for (page = 0; page < n_fw_pages; page++) {
763 error = elants_i2c_fw_write_page(client,
764 fw->data + page * ELAN_FW_PAGESIZE);
765 if (error) {
766 dev_err(&client->dev,
767 "failed to write FW page %d: %d\n",
768 page, error);
769 return error;
770 }
771 }
772
773 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
774 msleep(300);
775
776 dev_info(&client->dev, "firmware update completed\n");
777 return 0;
778}
779
780static int elants_i2c_fw_update(struct elants_data *ts)
781{
782 struct i2c_client *client = ts->client;
783 const struct firmware *fw;
37dee1ac 784 char *fw_name;
66aee900
SL		 785 int error;
786
8c0776a8 787 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
37dee1ac
CM		 788 if (!fw_name)
789 return -ENOMEM;
790
791 dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
792 error = request_firmware(&fw, fw_name, &client->dev);
793 kfree(fw_name);
66aee900 794 if (error) {
37dee1ac
CM		 795 dev_err(&client->dev, "failed to request firmware: %d\n",
796 error);
66aee900
SL		 797 return error;
798 }
799
800 if (fw->size % ELAN_FW_PAGESIZE) {
801 dev_err(&client->dev, "invalid firmware length: %zu\n",
802 fw->size);
803 error = -EINVAL;
804 goto out;
805 }
806
807 disable_irq(client->irq);
808
809 error = elants_i2c_do_update_firmware(client, fw,
810 ts->iap_mode == ELAN_IAP_RECOVERY);
811 if (error) {
812 dev_err(&client->dev, "firmware update failed: %d\n", error);
813 ts->iap_mode = ELAN_IAP_RECOVERY;
814 goto out_enable_irq;
815 }
816
817 error = elants_i2c_initialize(ts);
818 if (error) {
819 dev_err(&client->dev,
820 "failed to initialize device after firmware update: %d\n",
821 error);
822 ts->iap_mode = ELAN_IAP_RECOVERY;
823 goto out_enable_irq;
824 }
825
826 ts->iap_mode = ELAN_IAP_OPERATIONAL;
827
828out_enable_irq:
829 ts->state = ELAN_STATE_NORMAL;
830 enable_irq(client->irq);
831 msleep(100);
832
833 if (!error)
834 elants_i2c_calibrate(ts);
835out:
836 release_firmware(fw);
837 return error;
838}
839
840/*
841 * Event reporting.
842 */
843
844static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
845{
846 struct input_dev *input = ts->input;
847 unsigned int n_fingers;
f27ad893 848 unsigned int tool_type;
66aee900
SL		 849 u16 finger_state;
850 int i;
851
852 n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
853 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
854 buf[FW_POS_STATE];
855
856 dev_dbg(&ts->client->dev,
857 "n_fingers: %u, state: %04x\n", n_fingers, finger_state);
858
f27ad893
JC		 859 /* Note: all fingers have the same tool type */
860 tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
861 MT_TOOL_FINGER : MT_TOOL_PALM;
862
66aee900
SL		 863 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
864 if (finger_state & 1) {
865 unsigned int x, y, p, w;
866 u8 *pos;
867
868 pos = &buf[FW_POS_XY + i * 3];
869 x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
870 y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
871 p = buf[FW_POS_PRESSURE + i];
872 w = buf[FW_POS_WIDTH + i];
873
874 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
875 i, x, y, p, w);
876
877 input_mt_slot(input, i);
f27ad893 878 input_mt_report_slot_state(input, tool_type, true);
66aee900
SL		 879 input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
880 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
881 input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
882 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
883
884 n_fingers--;
885 }
886
887 finger_state >>= 1;
888 }
889
890 input_mt_sync_frame(input);
891 input_sync(input);
892}
893
894static u8 elants_i2c_calculate_checksum(u8 *buf)
895{
896 u8 checksum = 0;
897 u8 i;
898
899 for (i = 0; i < FW_POS_CHECKSUM; i++)
900 checksum += buf[i];
901
902 return checksum;
903}
904
905static void elants_i2c_event(struct elants_data *ts, u8 *buf)
906{
907 u8 checksum = elants_i2c_calculate_checksum(buf);
908
909 if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
910 dev_warn(&ts->client->dev,
911 "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
912 __func__, buf[FW_POS_HEADER],
913 checksum, buf[FW_POS_CHECKSUM]);
914 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
915 dev_warn(&ts->client->dev,
916 "%s: unknown packet type: %02x\n",
917 __func__, buf[FW_POS_HEADER]);
918 else
919 elants_i2c_mt_event(ts, buf);
920}
921
922static irqreturn_t elants_i2c_irq(int irq, void *_dev)
923{
924 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
925 struct elants_data *ts = _dev;
926 struct i2c_client *client = ts->client;
927 int report_count, report_len;
928 int i;
929 int len;
930
00f73f97 931 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
66aee900
SL		 932 if (len < 0) {
933 dev_err(&client->dev, "%s: failed to read data: %d\n",
934 __func__, len);
935 goto out;
936 }
937
938 dev_dbg(&client->dev, "%s: packet %*ph\n",
939 __func__, HEADER_SIZE, ts->buf);
940
941 switch (ts->state) {
942 case ELAN_WAIT_RECALIBRATION:
943 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
944 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
945 complete(&ts->cmd_done);
946 ts->state = ELAN_STATE_NORMAL;
947 }
948 break;
949
950 case ELAN_WAIT_QUEUE_HEADER:
951 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
952 break;
953
954 ts->state = ELAN_STATE_NORMAL;
955 /* fall through */
956
957 case ELAN_STATE_NORMAL:
958
959 switch (ts->buf[FW_HDR_TYPE]) {
960 case CMD_HEADER_HELLO:
961 case CMD_HEADER_RESP:
962 case CMD_HEADER_REK:
963 break;
964
965 case QUEUE_HEADER_WAIT:
966 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
967 dev_err(&client->dev,
968 "invalid wait packet %*ph\n",
969 HEADER_SIZE, ts->buf);
970 } else {
971 ts->state = ELAN_WAIT_QUEUE_HEADER;
972 udelay(30);
973 }
974 break;
975
976 case QUEUE_HEADER_SINGLE:
977 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
978 break;
979
980 case QUEUE_HEADER_NORMAL:
981 report_count = ts->buf[FW_HDR_COUNT];
1c3415a0 982 if (report_count == 0 || report_count > 3) {
66aee900 983 dev_err(&client->dev,
1c3415a0 984 "bad report count: %*ph\n",
66aee900
SL		 985 HEADER_SIZE, ts->buf);
986 break;
987 }
988
989 report_len = ts->buf[FW_HDR_LENGTH] / report_count;
990 if (report_len != PACKET_SIZE) {
991 dev_err(&client->dev,
992 "mismatching report length: %*ph\n",
993 HEADER_SIZE, ts->buf);
994 break;
995 }
996
997 for (i = 0; i < report_count; i++) {
998 u8 *buf = ts->buf + HEADER_SIZE +
999 i * PACKET_SIZE;
1000 elants_i2c_event(ts, buf);
1001 }
1002 break;
1003
1004 default:
1005 dev_err(&client->dev, "unknown packet %*ph\n",
1006 HEADER_SIZE, ts->buf);
1007 break;
1008 }
1009 break;
1010 }
1011
1012out:
1013 return IRQ_HANDLED;
1014}
1015
1016/*
1017 * sysfs interface
1018 */
1019static ssize_t calibrate_store(struct device *dev,
1020 struct device_attribute *attr,
cf520c64 1021 const char *buf, size_t count)
66aee900
SL		 1022{
1023 struct i2c_client *client = to_i2c_client(dev);
1024 struct elants_data *ts = i2c_get_clientdata(client);
1025 int error;
1026
1027 error = mutex_lock_interruptible(&ts->sysfs_mutex);
1028 if (error)
1029 return error;
1030
1031 error = elants_i2c_calibrate(ts);
1032
1033 mutex_unlock(&ts->sysfs_mutex);
1034 return error ?: count;
1035}
1036
1037static ssize_t write_update_fw(struct device *dev,
1038 struct device_attribute *attr,
1039 const char *buf, size_t count)
1040{
1041 struct i2c_client *client = to_i2c_client(dev);
1042 struct elants_data *ts = i2c_get_clientdata(client);
1043 int error;
1044
1045 error = mutex_lock_interruptible(&ts->sysfs_mutex);
1046 if (error)
1047 return error;
1048
1049 error = elants_i2c_fw_update(ts);
1050 dev_dbg(dev, "firmware update result: %d\n", error);
1051
1052 mutex_unlock(&ts->sysfs_mutex);
1053 return error ?: count;
1054}
1055
1056static ssize_t show_iap_mode(struct device *dev,
1057 struct device_attribute *attr, char *buf)
1058{
1059 struct i2c_client *client = to_i2c_client(dev);
1060 struct elants_data *ts = i2c_get_clientdata(client);
1061
1062 return sprintf(buf, "%s\n",
1063 ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1064 "Normal" : "Recovery");
1065}
1066
cf520c64
JC		 1067static ssize_t show_calibration_count(struct device *dev,
1068 struct device_attribute *attr, char *buf)
1069{
1070 struct i2c_client *client = to_i2c_client(dev);
1071 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 };
1072 u8 resp[HEADER_SIZE];
1073 u16 rek_count;
1074 int error;
1075
1076 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
1077 resp, sizeof(resp));
1078 if (error) {
1079 dev_err(&client->dev,
1080 "read ReK status error=%d, buf=%*phC\n",
1081 error, (int)sizeof(resp), resp);
1082 return sprintf(buf, "%d\n", error);
1083 }
1084
1085 rek_count = get_unaligned_be16(&resp[2]);
1086
1087 return sprintf(buf, "0x%04x\n", rek_count);
1088}
1089
6cbaefb4 1090static DEVICE_ATTR_WO(calibrate);
66aee900 1091static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
cf520c64 1092static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL);
66aee900
SL		 1093static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1094
1095struct elants_version_attribute {
1096 struct device_attribute dattr;
1097 size_t field_offset;
1098 size_t field_size;
1099};
1100
1101#define __ELANTS_FIELD_SIZE(_field) \
1102 sizeof(((struct elants_data *)NULL)->_field)
1103#define __ELANTS_VERIFY_SIZE(_field) \
1104 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \
1105 __ELANTS_FIELD_SIZE(_field))
1106#define ELANTS_VERSION_ATTR(_field) \
1107 struct elants_version_attribute elants_ver_attr_##_field = { \
1108 .dattr = __ATTR(_field, S_IRUGO, \
1109 elants_version_attribute_show, NULL), \
1110 .field_offset = offsetof(struct elants_data, _field), \
1111 .field_size = __ELANTS_VERIFY_SIZE(_field), \
1112 }
1113
1114static ssize_t elants_version_attribute_show(struct device *dev,
1115 struct device_attribute *dattr,
1116 char *buf)
1117{
1118 struct i2c_client *client = to_i2c_client(dev);
1119 struct elants_data *ts = i2c_get_clientdata(client);
1120 struct elants_version_attribute *attr =
1121 container_of(dattr, struct elants_version_attribute, dattr);
1122 u8 *field = (u8 *)((char *)ts + attr->field_offset);
1123 unsigned int fmt_size;
1124 unsigned int val;
1125
1126 if (attr->field_size == 1) {
1127 val = *field;
1128 fmt_size = 2; /* 2 HEX digits */
1129 } else {
1130 val = *(u16 *)field;
1131 fmt_size = 4; /* 4 HEX digits */
1132 }
1133
1134 return sprintf(buf, "%0*x\n", fmt_size, val);
1135}
1136
1137static ELANTS_VERSION_ATTR(fw_version);
1138static ELANTS_VERSION_ATTR(hw_version);
1139static ELANTS_VERSION_ATTR(test_version);
1140static ELANTS_VERSION_ATTR(solution_version);
1141static ELANTS_VERSION_ATTR(bc_version);
1142static ELANTS_VERSION_ATTR(iap_version);
1143
1144static struct attribute *elants_attributes[] = {
1145 &dev_attr_calibrate.attr,
1146 &dev_attr_update_fw.attr,
1147 &dev_attr_iap_mode.attr,
cf520c64 1148 &dev_attr_calibration_count.attr,
66aee900
SL		 1149
1150 &elants_ver_attr_fw_version.dattr.attr,
1151 &elants_ver_attr_hw_version.dattr.attr,
1152 &elants_ver_attr_test_version.dattr.attr,
1153 &elants_ver_attr_solution_version.dattr.attr,
1154 &elants_ver_attr_bc_version.dattr.attr,
1155 &elants_ver_attr_iap_version.dattr.attr,
1156 NULL
1157};
1158
48f960dd 1159static const struct attribute_group elants_attribute_group = {
66aee900
SL		 1160 .attrs = elants_attributes,
1161};
1162
afe10358
DT		 1163static int elants_i2c_power_on(struct elants_data *ts)
1164{
1165 int error;
1166
1167 /*
1168 * If we do not have reset gpio assume platform firmware
1169 * controls regulators and does power them on for us.
1170 */
1171 if (IS_ERR_OR_NULL(ts->reset_gpio))
1172 return 0;
1173
1174 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1175
1176 error = regulator_enable(ts->vcc33);
1177 if (error) {
1178 dev_err(&ts->client->dev,
1179 "failed to enable vcc33 regulator: %d\n",
1180 error);
1181 goto release_reset_gpio;
1182 }
1183
1184 error = regulator_enable(ts->vccio);
1185 if (error) {
1186 dev_err(&ts->client->dev,
1187 "failed to enable vccio regulator: %d\n",
1188 error);
1189 regulator_disable(ts->vcc33);
1190 goto release_reset_gpio;
1191 }
1192
1193 /*
1194 * We need to wait a bit after powering on controller before
1195 * we are allowed to release reset GPIO.
1196 */
1197 udelay(ELAN_POWERON_DELAY_USEC);
1198
1199release_reset_gpio:
1200 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1201 if (error)
1202 return error;
1203
1204 msleep(ELAN_RESET_DELAY_MSEC);
1205
1206 return 0;
1207}
1208
1209static void elants_i2c_power_off(void *_data)
1210{
1211 struct elants_data *ts = _data;
1212
1213 if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1214 /*
1215 * Activate reset gpio to prevent leakage through the
1216 * pin once we shut off power to the controller.
1217 */
1218 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1219 regulator_disable(ts->vccio);
1220 regulator_disable(ts->vcc33);
1221 }
1222}
1223
66aee900
SL		 1224static int elants_i2c_probe(struct i2c_client *client,
1225 const struct i2c_device_id *id)
1226{
1227 union i2c_smbus_data dummy;
1228 struct elants_data *ts;
1229 unsigned long irqflags;
1230 int error;
1231
1232 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1233 dev_err(&client->dev,
1234 "%s: i2c check functionality error\n", DEVICE_NAME);
1235 return -ENXIO;
1236 }
1237
66aee900
SL		 1238 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1239 if (!ts)
1240 return -ENOMEM;
1241
1242 mutex_init(&ts->sysfs_mutex);
1243 init_completion(&ts->cmd_done);
1244
1245 ts->client = client;
1246 i2c_set_clientdata(client, ts);
1247
afe10358
DT		 1248 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1249 if (IS_ERR(ts->vcc33)) {
1250 error = PTR_ERR(ts->vcc33);
1251 if (error != -EPROBE_DEFER)
1252 dev_err(&client->dev,
1253 "Failed to get 'vcc33' regulator: %d\n",
1254 error);
1255 return error;
1256 }
1257
1258 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1259 if (IS_ERR(ts->vccio)) {
1260 error = PTR_ERR(ts->vccio);
1261 if (error != -EPROBE_DEFER)
1262 dev_err(&client->dev,
1263 "Failed to get 'vccio' regulator: %d\n",
1264 error);
1265 return error;
1266 }
1267
7229b87b 1268 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
afe10358
DT		 1269 if (IS_ERR(ts->reset_gpio)) {
1270 error = PTR_ERR(ts->reset_gpio);
1271
1272 if (error == -EPROBE_DEFER)
1273 return error;
1274
1275 if (error != -ENOENT && error != -ENOSYS) {
1276 dev_err(&client->dev,
1277 "failed to get reset gpio: %d\n",
1278 error);
1279 return error;
1280 }
1281
1282 ts->keep_power_in_suspend = true;
afe10358
DT		 1283 }
1284
1285 error = elants_i2c_power_on(ts);
1286 if (error)
1287 return error;
1288
1289 error = devm_add_action(&client->dev, elants_i2c_power_off, ts);
1290 if (error) {
1291 dev_err(&client->dev,
1292 "failed to install power off action: %d\n", error);
1293 elants_i2c_power_off(ts);
1294 return error;
1295 }
1296
1297 /* Make sure there is something at this address */
1298 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1299 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1300 dev_err(&client->dev, "nothing at this address\n");
1301 return -ENXIO;
1302 }
1303
66aee900
SL		 1304 error = elants_i2c_initialize(ts);
1305 if (error) {
1306 dev_err(&client->dev, "failed to initialize: %d\n", error);
1307 return error;
1308 }
1309
1310 ts->input = devm_input_allocate_device(&client->dev);
1311 if (!ts->input) {
1312 dev_err(&client->dev, "Failed to allocate input device\n");
1313 return -ENOMEM;
1314 }
1315
1316 ts->input->name = "Elan Touchscreen";
1317 ts->input->id.bustype = BUS_I2C;
1318
66aee900 1319 /* Multitouch input params setup */
66aee900
SL		 1320
1321 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1322 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1323 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1324 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
f27ad893
JC		 1325 input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE,
1326 0, MT_TOOL_PALM, 0, 0);
66aee900
SL		 1327 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1328 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
06170671 1329 input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1);
66aee900 1330
6def17b1
MM		 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
66aee900
SL		 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 /*
4c83c071
DT		 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.
66aee900 1350 */
4c83c071
DT		 1351 irqflags = irq_get_trigger_type(client->irq);
1352 if (!irqflags)
1353 irqflags = IRQF_TRIGGER_FALLING;
66aee900
SL		 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
8db69a9a 1371 error = devm_device_add_group(&client->dev, &elants_attribute_group);
66aee900
SL		 1372 if (error) {
1373 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1374 error);
1375 return error;
1376 }
1377
66aee900
SL		 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
478e5ed1
JC		 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) {
afe10358
DT		 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;
66aee900 1407
afe10358
DT		 1408 dev_err(&client->dev,
1409 "suspend command failed: %d\n", error);
1410 }
afe10358
DT		 1411 } else {
1412 elants_i2c_power_off(ts);
1413 }
66aee900
SL		 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
478e5ed1
JC		 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) {
afe10358
DT		 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;
66aee900 1436
afe10358
DT		 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);
66aee900
SL		 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,
66aee900
SL		 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),
9f6a07b6 1484 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
66aee900
SL		 1485 },
1486};
1487module_i2c_driver(elants_i2c_driver);
1488
1489MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1490MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
66aee900 1491MODULE_LICENSE("GPL");
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