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/pm_wakeirq.h>
40 #include <linux/gpio/consumer.h>
41 #include <linux/regulator/consumer.h>
42 #include <linux/uuid.h>
43 #include <linux/unaligned.h>
44
45 /* Device, Driver information */
46 #define DEVICE_NAME "elants_i2c"
47
48 /* Convert from rows or columns into resolution */
49 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m))
50
51 /* FW header data */
52 #define HEADER_SIZE 4
53 #define FW_HDR_TYPE 0
54 #define FW_HDR_COUNT 1
55 #define FW_HDR_LENGTH 2
56
57 /* Buffer mode Queue Header information */
58 #define QUEUE_HEADER_SINGLE 0x62
59 #define QUEUE_HEADER_NORMAL 0X63
60 #define QUEUE_HEADER_WAIT 0x64
61 #define QUEUE_HEADER_NORMAL2 0x66
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_ROM_READ 0x96
68 #define CMD_HEADER_RESP 0x52
69 #define CMD_HEADER_6B_RESP 0x9B
70 #define CMD_HEADER_ROM_RESP 0x95
71 #define CMD_HEADER_HELLO 0x55
72 #define CMD_HEADER_REK 0x66
73
74 /* FW position data */
75 #define PACKET_SIZE_OLD 40
76 #define PACKET_SIZE 55
77 #define MAX_CONTACT_NUM 10
78 #define FW_POS_HEADER 0
79 #define FW_POS_STATE 1
80 #define FW_POS_TOTAL 2
81 #define FW_POS_XY 3
82 #define FW_POS_TOOL_TYPE 33
83 #define FW_POS_CHECKSUM 34
84 #define FW_POS_WIDTH 35
85 #define FW_POS_PRESSURE 45
86
87 #define HEADER_REPORT_10_FINGER 0x62
88
89 /* Header (4 bytes) plus 3 full 10-finger packets */
90 #define MAX_PACKET_SIZE 169
91
92 #define BOOT_TIME_DELAY_MS 50
93
94 /* FW read command, 0x53 0x?? 0x0, 0x01 */
95 #define E_ELAN_INFO_FW_VER 0x00
96 #define E_ELAN_INFO_BC_VER 0x10
97 #define E_ELAN_INFO_X_RES 0x60
98 #define E_ELAN_INFO_Y_RES 0x63
99 #define E_ELAN_INFO_REK 0xD0
100 #define E_ELAN_INFO_TEST_VER 0xE0
101 #define E_ELAN_INFO_FW_ID 0xF0
102 #define E_INFO_OSR 0xD6
103 #define E_INFO_PHY_SCAN 0xD7
104 #define E_INFO_PHY_DRIVER 0xD8
105
106 /* FW write command, 0x54 0x?? 0x0, 0x01 */
107 #define E_POWER_STATE_SLEEP 0x50
108 #define E_POWER_STATE_RESUME 0x58
109
110 #define MAX_RETRIES 3
111 #define MAX_FW_UPDATE_RETRIES 30
112
113 #define ELAN_FW_PAGESIZE 132
114
115 /* calibration timeout definition */
116 #define ELAN_CALI_TIMEOUT_MSEC 12000
117
118 #define ELAN_POWERON_DELAY_USEC 5000
119 #define ELAN_RESET_DELAY_MSEC 20
120
121 /* FW boot code version */
122 #define BC_VER_H_BYTE_FOR_EKTH3900x1_I2C 0x72
123 #define BC_VER_H_BYTE_FOR_EKTH3900x2_I2C 0x82
124 #define BC_VER_H_BYTE_FOR_EKTH3900x3_I2C 0x92
125 #define BC_VER_H_BYTE_FOR_EKTH5312x1_I2C 0x6D
126 #define BC_VER_H_BYTE_FOR_EKTH5312x2_I2C 0x6E
127 #define BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C 0x77
128 #define BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C 0x78
129 #define BC_VER_H_BYTE_FOR_EKTH5312x1_I2C_USB 0x67
130 #define BC_VER_H_BYTE_FOR_EKTH5312x2_I2C_USB 0x68
131 #define BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C_USB 0x74
132 #define BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C_USB 0x75
133
134 enum elants_chip_id {
135 EKTH3500,
136 EKTF3624,
137 };
138
139 enum elants_state {
140 ELAN_STATE_NORMAL,
141 ELAN_WAIT_QUEUE_HEADER,
142 ELAN_WAIT_RECALIBRATION,
143 };
144
145 enum elants_iap_mode {
146 ELAN_IAP_OPERATIONAL,
147 ELAN_IAP_RECOVERY,
148 };
149
150 /* struct elants_data - represents state of Elan touchscreen device */
151 struct elants_data {
152 struct i2c_client *client;
153 struct input_dev *input;
154
155 struct regulator *vcc33;
156 struct regulator *vccio;
157 struct gpio_desc *reset_gpio;
158
159 u16 fw_version;
160 u8 test_version;
161 u8 solution_version;
162 u8 bc_version;
163 u8 iap_version;
164 u16 hw_version;
165 u8 major_res;
166 unsigned int x_res; /* resolution in units/mm */
167 unsigned int y_res;
168 unsigned int x_max;
169 unsigned int y_max;
170 unsigned int phy_x;
171 unsigned int phy_y;
172 struct touchscreen_properties prop;
173
174 enum elants_state state;
175 enum elants_chip_id chip_id;
176 enum elants_iap_mode iap_mode;
177
178 /* Guards against concurrent access to the device via sysfs */
179 struct mutex sysfs_mutex;
180
181 u8 cmd_resp[HEADER_SIZE];
182 struct completion cmd_done;
183
184 bool keep_power_in_suspend;
185
186 /* Must be last to be used for DMA operations */
187 u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
188 };
189
elants_i2c_send(struct i2c_client * client,const void * data,size_t size)190 static int elants_i2c_send(struct i2c_client *client,
191 const void *data, size_t size)
192 {
193 int ret;
194
195 ret = i2c_master_send(client, data, size);
196 if (ret == size)
197 return 0;
198
199 if (ret >= 0)
200 ret = -EIO;
201
202 dev_err(&client->dev, "%s failed (%*ph): %d\n",
203 __func__, (int)size, data, ret);
204
205 return ret;
206 }
207
elants_i2c_read(struct i2c_client * client,void * data,size_t size)208 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
209 {
210 int ret;
211
212 ret = i2c_master_recv(client, data, size);
213 if (ret == size)
214 return 0;
215
216 if (ret >= 0)
217 ret = -EIO;
218
219 dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
220
221 return ret;
222 }
223
elants_i2c_execute_command(struct i2c_client * client,const u8 * cmd,size_t cmd_size,u8 * resp,size_t resp_size,int retries,const char * cmd_name)224 static int elants_i2c_execute_command(struct i2c_client *client,
225 const u8 *cmd, size_t cmd_size,
226 u8 *resp, size_t resp_size,
227 int retries, const char *cmd_name)
228 {
229 struct i2c_msg msgs[2];
230 int ret;
231 u8 expected_response;
232
233 switch (cmd[0]) {
234 case CMD_HEADER_READ:
235 expected_response = CMD_HEADER_RESP;
236 break;
237
238 case CMD_HEADER_6B_READ:
239 expected_response = CMD_HEADER_6B_RESP;
240 break;
241
242 case CMD_HEADER_ROM_READ:
243 expected_response = CMD_HEADER_ROM_RESP;
244 break;
245
246 default:
247 dev_err(&client->dev, "(%s): invalid command: %*ph\n",
248 cmd_name, (int)cmd_size, cmd);
249 return -EINVAL;
250 }
251
252 for (;;) {
253 msgs[0].addr = client->addr;
254 msgs[0].flags = client->flags & I2C_M_TEN;
255 msgs[0].len = cmd_size;
256 msgs[0].buf = (u8 *)cmd;
257
258 msgs[1].addr = client->addr;
259 msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
260 msgs[1].flags |= I2C_M_RD;
261 msgs[1].len = resp_size;
262 msgs[1].buf = resp;
263
264 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
265 if (ret < 0) {
266 if (--retries > 0) {
267 dev_dbg(&client->dev,
268 "(%s) I2C transfer failed: %pe (retrying)\n",
269 cmd_name, ERR_PTR(ret));
270 continue;
271 }
272
273 dev_err(&client->dev,
274 "(%s) I2C transfer failed: %pe\n",
275 cmd_name, ERR_PTR(ret));
276 return ret;
277 }
278
279 if (ret != ARRAY_SIZE(msgs) ||
280 resp[FW_HDR_TYPE] != expected_response) {
281 if (--retries > 0) {
282 dev_dbg(&client->dev,
283 "(%s) unexpected response: %*ph (retrying)\n",
284 cmd_name, ret, resp);
285 continue;
286 }
287
288 dev_err(&client->dev,
289 "(%s) unexpected response: %*ph\n",
290 cmd_name, ret, resp);
291 return -EIO;
292 }
293
294 return 0;
295 }
296 }
297
elants_i2c_calibrate(struct elants_data * ts)298 static int elants_i2c_calibrate(struct elants_data *ts)
299 {
300 struct i2c_client *client = ts->client;
301 int ret, error;
302 static const u8 w_flashkey[] = { CMD_HEADER_WRITE, 0xC0, 0xE1, 0x5A };
303 static const u8 rek[] = { CMD_HEADER_WRITE, 0x29, 0x00, 0x01 };
304 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
305
306 disable_irq(client->irq);
307
308 ts->state = ELAN_WAIT_RECALIBRATION;
309 reinit_completion(&ts->cmd_done);
310
311 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey));
312 elants_i2c_send(client, rek, sizeof(rek));
313
314 enable_irq(client->irq);
315
316 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done,
317 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC));
318
319 ts->state = ELAN_STATE_NORMAL;
320
321 if (ret <= 0) {
322 error = ret < 0 ? ret : -ETIMEDOUT;
323 dev_err(&client->dev,
324 "error while waiting for calibration to complete: %d\n",
325 error);
326 return error;
327 }
328
329 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) {
330 dev_err(&client->dev,
331 "unexpected calibration response: %*ph\n",
332 (int)sizeof(ts->cmd_resp), ts->cmd_resp);
333 return -EINVAL;
334 }
335
336 return 0;
337 }
338
elants_i2c_sw_reset(struct i2c_client * client)339 static int elants_i2c_sw_reset(struct i2c_client *client)
340 {
341 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 };
342 int error;
343
344 error = elants_i2c_send(client, soft_rst_cmd,
345 sizeof(soft_rst_cmd));
346 if (error) {
347 dev_err(&client->dev, "software reset failed: %d\n", error);
348 return error;
349 }
350
351 /*
352 * We should wait at least 10 msec (but no more than 40) before
353 * sending fastboot or IAP command to the device.
354 */
355 msleep(30);
356
357 return 0;
358 }
359
elants_i2c_parse_version(u8 * buf)360 static u16 elants_i2c_parse_version(u8 *buf)
361 {
362 return get_unaligned_be32(buf) >> 4;
363 }
364
elants_i2c_query_hw_version(struct elants_data * ts)365 static int elants_i2c_query_hw_version(struct elants_data *ts)
366 {
367 struct i2c_client *client = ts->client;
368 int retry_cnt = MAX_RETRIES;
369 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
370 u8 resp[HEADER_SIZE];
371 int error;
372
373 while (retry_cnt--) {
374 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
375 resp, sizeof(resp), 1,
376 "read fw id");
377 if (error)
378 return error;
379
380 ts->hw_version = elants_i2c_parse_version(resp);
381 if (ts->hw_version != 0xffff)
382 return 0;
383 }
384
385 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
386
387 return -EINVAL;
388 }
389
elants_i2c_query_fw_version(struct elants_data * ts)390 static int elants_i2c_query_fw_version(struct elants_data *ts)
391 {
392 struct i2c_client *client = ts->client;
393 int retry_cnt = MAX_RETRIES;
394 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
395 u8 resp[HEADER_SIZE];
396 int error;
397
398 while (retry_cnt--) {
399 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
400 resp, sizeof(resp), 1,
401 "read fw version");
402 if (error)
403 return error;
404
405 ts->fw_version = elants_i2c_parse_version(resp);
406 if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff)
407 return 0;
408
409 dev_dbg(&client->dev, "(read fw version) resp %*phC\n",
410 (int)sizeof(resp), resp);
411 }
412
413 dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version);
414
415 return -EINVAL;
416 }
417
elants_i2c_query_test_version(struct elants_data * ts)418 static int elants_i2c_query_test_version(struct elants_data *ts)
419 {
420 struct i2c_client *client = ts->client;
421 int error;
422 u16 version;
423 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
424 u8 resp[HEADER_SIZE];
425
426 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
427 resp, sizeof(resp), MAX_RETRIES,
428 "read test version");
429 if (error) {
430 dev_err(&client->dev, "Failed to read test version\n");
431 return error;
432 }
433
434 version = elants_i2c_parse_version(resp);
435 ts->test_version = version >> 8;
436 ts->solution_version = version & 0xff;
437
438 return 0;
439 }
440
elants_i2c_query_bc_version(struct elants_data * ts)441 static int elants_i2c_query_bc_version(struct elants_data *ts)
442 {
443 struct i2c_client *client = ts->client;
444 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 };
445 u8 resp[HEADER_SIZE];
446 u16 version;
447 int error;
448
449 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
450 resp, sizeof(resp), 1,
451 "read BC version");
452 if (error)
453 return error;
454
455 version = elants_i2c_parse_version(resp);
456 ts->bc_version = version >> 8;
457 ts->iap_version = version & 0xff;
458
459 return 0;
460 }
461
elants_i2c_query_ts_info_ektf(struct elants_data * ts)462 static int elants_i2c_query_ts_info_ektf(struct elants_data *ts)
463 {
464 struct i2c_client *client = ts->client;
465 int error;
466 u8 resp[4];
467 u16 phy_x, phy_y;
468 const u8 get_xres_cmd[] = {
469 CMD_HEADER_READ, E_ELAN_INFO_X_RES, 0x00, 0x00
470 };
471 const u8 get_yres_cmd[] = {
472 CMD_HEADER_READ, E_ELAN_INFO_Y_RES, 0x00, 0x00
473 };
474
475 /* Get X/Y size in mm */
476 error = elants_i2c_execute_command(client, get_xres_cmd,
477 sizeof(get_xres_cmd),
478 resp, sizeof(resp), 1,
479 "get X size");
480 if (error)
481 return error;
482
483 phy_x = resp[2] | ((resp[3] & 0xF0) << 4);
484
485 error = elants_i2c_execute_command(client, get_yres_cmd,
486 sizeof(get_yres_cmd),
487 resp, sizeof(resp), 1,
488 "get Y size");
489 if (error)
490 return error;
491
492 phy_y = resp[2] | ((resp[3] & 0xF0) << 4);
493
494 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
495
496 ts->phy_x = phy_x;
497 ts->phy_y = phy_y;
498
499 /* eKTF doesn't report max size, set it to default values */
500 ts->x_max = 2240 - 1;
501 ts->y_max = 1408 - 1;
502
503 return 0;
504 }
505
elants_i2c_query_ts_info_ekth(struct elants_data * ts)506 static int elants_i2c_query_ts_info_ekth(struct elants_data *ts)
507 {
508 struct i2c_client *client = ts->client;
509 int error;
510 u8 resp[17];
511 u16 phy_x, phy_y, rows, cols, osr;
512 const u8 get_resolution_cmd[] = {
513 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00
514 };
515 const u8 get_osr_cmd[] = {
516 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01
517 };
518 const u8 get_physical_scan_cmd[] = {
519 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01
520 };
521 const u8 get_physical_drive_cmd[] = {
522 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01
523 };
524
525 /* Get trace number */
526 error = elants_i2c_execute_command(client,
527 get_resolution_cmd,
528 sizeof(get_resolution_cmd),
529 resp, sizeof(resp), 1,
530 "get resolution");
531 if (error)
532 return error;
533
534 rows = resp[2] + resp[6] + resp[10];
535 cols = resp[3] + resp[7] + resp[11];
536
537 /* Get report resolution value of ABS_MT_TOUCH_MAJOR */
538 ts->major_res = resp[16];
539
540 /* Process mm_to_pixel information */
541 error = elants_i2c_execute_command(client,
542 get_osr_cmd, sizeof(get_osr_cmd),
543 resp, sizeof(resp), 1, "get osr");
544 if (error)
545 return error;
546
547 osr = resp[3];
548
549 error = elants_i2c_execute_command(client,
550 get_physical_scan_cmd,
551 sizeof(get_physical_scan_cmd),
552 resp, sizeof(resp), 1,
553 "get physical scan");
554 if (error)
555 return error;
556
557 phy_x = get_unaligned_be16(&resp[2]);
558
559 error = elants_i2c_execute_command(client,
560 get_physical_drive_cmd,
561 sizeof(get_physical_drive_cmd),
562 resp, sizeof(resp), 1,
563 "get physical drive");
564 if (error)
565 return error;
566
567 phy_y = get_unaligned_be16(&resp[2]);
568
569 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
570
571 if (rows == 0 || cols == 0 || osr == 0) {
572 dev_warn(&client->dev,
573 "invalid trace number data: %d, %d, %d\n",
574 rows, cols, osr);
575 } else {
576 /* translate trace number to TS resolution */
577 ts->x_max = ELAN_TS_RESOLUTION(rows, osr);
578 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
579 ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
580 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
581 ts->phy_x = phy_x;
582 ts->phy_y = phy_y;
583 }
584
585 return 0;
586 }
587
elants_i2c_fastboot(struct i2c_client * client)588 static int elants_i2c_fastboot(struct i2c_client *client)
589 {
590 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E };
591 int error;
592
593 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd));
594 if (error) {
595 dev_err(&client->dev, "boot failed: %d\n", error);
596 return error;
597 }
598
599 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
600 return 0;
601 }
602
elants_i2c_initialize(struct elants_data * ts)603 static int elants_i2c_initialize(struct elants_data *ts)
604 {
605 struct i2c_client *client = ts->client;
606 int error, error2, retry_cnt;
607 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
608 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
609 u8 buf[HEADER_SIZE];
610
611 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
612 error = elants_i2c_sw_reset(client);
613 if (error) {
614 /* Continue initializing if it's the last try */
615 if (retry_cnt < MAX_RETRIES - 1)
616 continue;
617 }
618
619 error = elants_i2c_fastboot(client);
620 if (error) {
621 /* Continue initializing if it's the last try */
622 if (retry_cnt < MAX_RETRIES - 1)
623 continue;
624 }
625
626 /* Wait for Hello packet */
627 msleep(BOOT_TIME_DELAY_MS);
628
629 error = elants_i2c_read(client, buf, sizeof(buf));
630 if (error) {
631 dev_err(&client->dev,
632 "failed to read 'hello' packet: %d\n", error);
633 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) {
634 ts->iap_mode = ELAN_IAP_OPERATIONAL;
635 break;
636 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) {
637 /*
638 * Setting error code will mark device
639 * in recovery mode below.
640 */
641 error = -EIO;
642 break;
643 } else {
644 error = -EINVAL;
645 dev_err(&client->dev,
646 "invalid 'hello' packet: %*ph\n",
647 (int)sizeof(buf), buf);
648 }
649 }
650
651 /* hw version is available even if device in recovery state */
652 error2 = elants_i2c_query_hw_version(ts);
653 if (!error2)
654 error2 = elants_i2c_query_bc_version(ts);
655 if (!error)
656 error = error2;
657
658 if (!error)
659 error = elants_i2c_query_fw_version(ts);
660 if (!error)
661 error = elants_i2c_query_test_version(ts);
662
663 switch (ts->chip_id) {
664 case EKTH3500:
665 if (!error)
666 error = elants_i2c_query_ts_info_ekth(ts);
667 break;
668 case EKTF3624:
669 if (!error)
670 error = elants_i2c_query_ts_info_ektf(ts);
671 break;
672 default:
673 BUG();
674 }
675
676 if (error)
677 ts->iap_mode = ELAN_IAP_RECOVERY;
678
679 return 0;
680 }
681
682 /*
683 * Firmware update interface.
684 */
685
elants_i2c_fw_write_page(struct i2c_client * client,const void * page)686 static int elants_i2c_fw_write_page(struct i2c_client *client,
687 const void *page)
688 {
689 const u8 ack_ok[] = { 0xaa, 0xaa };
690 u8 buf[2];
691 int retry;
692 int error;
693
694 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
695 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE);
696 if (error) {
697 dev_err(&client->dev,
698 "IAP Write Page failed: %d\n", error);
699 continue;
700 }
701
702 error = elants_i2c_read(client, buf, 2);
703 if (error) {
704 dev_err(&client->dev,
705 "IAP Ack read failed: %d\n", error);
706 return error;
707 }
708
709 if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
710 return 0;
711
712 error = -EIO;
713 dev_err(&client->dev,
714 "IAP Get Ack Error [%02x:%02x]\n",
715 buf[0], buf[1]);
716 }
717
718 return error;
719 }
720
elants_i2c_validate_remark_id(struct elants_data * ts,const struct firmware * fw)721 static int elants_i2c_validate_remark_id(struct elants_data *ts,
722 const struct firmware *fw)
723 {
724 struct i2c_client *client = ts->client;
725 int error;
726 const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 };
727 u8 resp[6] = { 0 };
728 u16 ts_remark_id = 0;
729 u16 fw_remark_id = 0;
730
731 /* Compare TS Remark ID and FW Remark ID */
732 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
733 resp, sizeof(resp),
734 1, "read Remark ID");
735 if (error)
736 return error;
737
738 ts_remark_id = get_unaligned_be16(&resp[3]);
739
740 fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
741
742 if (fw_remark_id != ts_remark_id) {
743 dev_err(&client->dev,
744 "Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n",
745 ts_remark_id, fw_remark_id);
746 return -EINVAL;
747 }
748
749 return 0;
750 }
751
elants_i2c_should_check_remark_id(struct elants_data * ts)752 static bool elants_i2c_should_check_remark_id(struct elants_data *ts)
753 {
754 struct i2c_client *client = ts->client;
755 const u8 bootcode_version = ts->iap_version;
756 bool check;
757
758 /* I2C eKTH3900 and eKTH5312 are NOT support Remark ID */
759 if ((bootcode_version == BC_VER_H_BYTE_FOR_EKTH3900x1_I2C) ||
760 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH3900x2_I2C) ||
761 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH3900x3_I2C) ||
762 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x1_I2C) ||
763 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x2_I2C) ||
764 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C) ||
765 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C) ||
766 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x1_I2C_USB) ||
767 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312x2_I2C_USB) ||
768 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx1_I2C_USB) ||
769 (bootcode_version == BC_VER_H_BYTE_FOR_EKTH5312cx2_I2C_USB)) {
770 dev_dbg(&client->dev,
771 "eKTH3900/eKTH5312(0x%02x) are not support remark id\n",
772 bootcode_version);
773 check = false;
774 } else if (bootcode_version >= 0x60) {
775 check = true;
776 } else {
777 check = false;
778 }
779
780 return check;
781 }
782
elants_i2c_do_update_firmware(struct i2c_client * client,const struct firmware * fw,bool force)783 static int elants_i2c_do_update_firmware(struct i2c_client *client,
784 const struct firmware *fw,
785 bool force)
786 {
787 struct elants_data *ts = i2c_get_clientdata(client);
788 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
789 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
790 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
791 const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
792 u8 buf[HEADER_SIZE];
793 u16 send_id;
794 int page, n_fw_pages;
795 int error;
796 bool check_remark_id = elants_i2c_should_check_remark_id(ts);
797
798 /* Recovery mode detection! */
799 if (force) {
800 dev_dbg(&client->dev, "Recovery mode procedure\n");
801
802 if (check_remark_id) {
803 error = elants_i2c_validate_remark_id(ts, fw);
804 if (error)
805 return error;
806 }
807
808 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2));
809 if (error) {
810 dev_err(&client->dev, "failed to enter IAP mode: %d\n",
811 error);
812 return error;
813 }
814 } else {
815 /* Start IAP Procedure */
816 dev_dbg(&client->dev, "Normal IAP procedure\n");
817
818 /* Close idle mode */
819 error = elants_i2c_send(client, close_idle, sizeof(close_idle));
820 if (error)
821 dev_err(&client->dev, "Failed close idle: %d\n", error);
822 msleep(60);
823
824 elants_i2c_sw_reset(client);
825 msleep(20);
826
827 if (check_remark_id) {
828 error = elants_i2c_validate_remark_id(ts, fw);
829 if (error)
830 return error;
831 }
832
833 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap));
834 if (error) {
835 dev_err(&client->dev, "failed to enter IAP mode: %d\n",
836 error);
837 return error;
838 }
839 }
840
841 msleep(20);
842
843 /* check IAP state */
844 error = elants_i2c_read(client, buf, 4);
845 if (error) {
846 dev_err(&client->dev,
847 "failed to read IAP acknowledgement: %d\n",
848 error);
849 return error;
850 }
851
852 if (memcmp(buf, iap_ack, sizeof(iap_ack))) {
853 dev_err(&client->dev,
854 "failed to enter IAP: %*ph (expected %*ph)\n",
855 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack);
856 return -EIO;
857 }
858
859 dev_info(&client->dev, "successfully entered IAP mode");
860
861 send_id = client->addr;
862 error = elants_i2c_send(client, &send_id, 1);
863 if (error) {
864 dev_err(&client->dev, "sending dummy byte failed: %d\n",
865 error);
866 return error;
867 }
868
869 /* Clear the last page of Master */
870 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE);
871 if (error) {
872 dev_err(&client->dev, "clearing of the last page failed: %d\n",
873 error);
874 return error;
875 }
876
877 error = elants_i2c_read(client, buf, 2);
878 if (error) {
879 dev_err(&client->dev,
880 "failed to read ACK for clearing the last page: %d\n",
881 error);
882 return error;
883 }
884
885 n_fw_pages = fw->size / ELAN_FW_PAGESIZE;
886 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages);
887
888 for (page = 0; page < n_fw_pages; page++) {
889 error = elants_i2c_fw_write_page(client,
890 fw->data + page * ELAN_FW_PAGESIZE);
891 if (error) {
892 dev_err(&client->dev,
893 "failed to write FW page %d: %d\n",
894 page, error);
895 return error;
896 }
897 }
898
899 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */
900 msleep(300);
901
902 dev_info(&client->dev, "firmware update completed\n");
903 return 0;
904 }
905
elants_i2c_fw_update(struct elants_data * ts)906 static int elants_i2c_fw_update(struct elants_data *ts)
907 {
908 struct i2c_client *client = ts->client;
909 const struct firmware *fw;
910 char *fw_name;
911 int error;
912
913 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version);
914 if (!fw_name)
915 return -ENOMEM;
916
917 dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
918 error = request_firmware(&fw, fw_name, &client->dev);
919 kfree(fw_name);
920 if (error) {
921 dev_err(&client->dev, "failed to request firmware: %d\n",
922 error);
923 return error;
924 }
925
926 if (fw->size % ELAN_FW_PAGESIZE) {
927 dev_err(&client->dev, "invalid firmware length: %zu\n",
928 fw->size);
929 error = -EINVAL;
930 goto out;
931 }
932
933 disable_irq(client->irq);
934
935 error = elants_i2c_do_update_firmware(client, fw,
936 ts->iap_mode == ELAN_IAP_RECOVERY);
937 if (error) {
938 dev_err(&client->dev, "firmware update failed: %d\n", error);
939 ts->iap_mode = ELAN_IAP_RECOVERY;
940 goto out_enable_irq;
941 }
942
943 error = elants_i2c_initialize(ts);
944 if (error) {
945 dev_err(&client->dev,
946 "failed to initialize device after firmware update: %d\n",
947 error);
948 ts->iap_mode = ELAN_IAP_RECOVERY;
949 goto out_enable_irq;
950 }
951
952 ts->iap_mode = ELAN_IAP_OPERATIONAL;
953
954 out_enable_irq:
955 ts->state = ELAN_STATE_NORMAL;
956 enable_irq(client->irq);
957 msleep(100);
958
959 if (!error)
960 elants_i2c_calibrate(ts);
961 out:
962 release_firmware(fw);
963 return error;
964 }
965
966 /*
967 * Event reporting.
968 */
969
elants_i2c_mt_event(struct elants_data * ts,u8 * buf,size_t packet_size)970 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf,
971 size_t packet_size)
972 {
973 struct input_dev *input = ts->input;
974 unsigned int n_fingers;
975 unsigned int tool_type;
976 u16 finger_state;
977 int i;
978
979 n_fingers = buf[FW_POS_STATE + 1] & 0x0f;
980 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) |
981 buf[FW_POS_STATE];
982
983 dev_dbg(&ts->client->dev,
984 "n_fingers: %u, state: %04x\n", n_fingers, finger_state);
985
986 /* Note: all fingers have the same tool type */
987 tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
988 MT_TOOL_FINGER : MT_TOOL_PALM;
989
990 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) {
991 if (finger_state & 1) {
992 unsigned int x, y, p, w;
993 u8 *pos;
994
995 pos = &buf[FW_POS_XY + i * 3];
996 x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
997 y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
998
999 /*
1000 * eKTF3624 may have use "old" touch-report format,
1001 * depending on a device and TS firmware version.
1002 * For example, ASUS Transformer devices use the "old"
1003 * format, while ASUS Nexus 7 uses the "new" formant.
1004 */
1005 if (packet_size == PACKET_SIZE_OLD &&
1006 ts->chip_id == EKTF3624) {
1007 w = buf[FW_POS_WIDTH + i / 2];
1008 w >>= 4 * (~i & 1);
1009 w |= w << 4;
1010 w |= !w;
1011 p = w;
1012 } else {
1013 p = buf[FW_POS_PRESSURE + i];
1014 w = buf[FW_POS_WIDTH + i];
1015 }
1016
1017 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
1018 i, x, y, p, w);
1019
1020 input_mt_slot(input, i);
1021 input_mt_report_slot_state(input, tool_type, true);
1022 touchscreen_report_pos(input, &ts->prop, x, y, true);
1023 input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
1024 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
1025
1026 n_fingers--;
1027 }
1028
1029 finger_state >>= 1;
1030 }
1031
1032 input_mt_sync_frame(input);
1033 input_sync(input);
1034 }
1035
elants_i2c_calculate_checksum(u8 * buf)1036 static u8 elants_i2c_calculate_checksum(u8 *buf)
1037 {
1038 u8 checksum = 0;
1039 u8 i;
1040
1041 for (i = 0; i < FW_POS_CHECKSUM; i++)
1042 checksum += buf[i];
1043
1044 return checksum;
1045 }
1046
elants_i2c_event(struct elants_data * ts,u8 * buf,size_t packet_size)1047 static void elants_i2c_event(struct elants_data *ts, u8 *buf,
1048 size_t packet_size)
1049 {
1050 u8 checksum = elants_i2c_calculate_checksum(buf);
1051
1052 if (unlikely(buf[FW_POS_CHECKSUM] != checksum))
1053 dev_warn(&ts->client->dev,
1054 "%s: invalid checksum for packet %02x: %02x vs. %02x\n",
1055 __func__, buf[FW_POS_HEADER],
1056 checksum, buf[FW_POS_CHECKSUM]);
1057 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER))
1058 dev_warn(&ts->client->dev,
1059 "%s: unknown packet type: %02x\n",
1060 __func__, buf[FW_POS_HEADER]);
1061 else
1062 elants_i2c_mt_event(ts, buf, packet_size);
1063 }
1064
elants_i2c_irq(int irq,void * _dev)1065 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
1066 {
1067 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 };
1068 struct elants_data *ts = _dev;
1069 struct i2c_client *client = ts->client;
1070 int report_count, report_len;
1071 int i;
1072 int len;
1073
1074 len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf));
1075 if (len < 0) {
1076 dev_err(&client->dev, "%s: failed to read data: %d\n",
1077 __func__, len);
1078 goto out;
1079 }
1080
1081 dev_dbg(&client->dev, "%s: packet %*ph\n",
1082 __func__, HEADER_SIZE, ts->buf);
1083
1084 switch (ts->state) {
1085 case ELAN_WAIT_RECALIBRATION:
1086 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) {
1087 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp));
1088 complete(&ts->cmd_done);
1089 ts->state = ELAN_STATE_NORMAL;
1090 }
1091 break;
1092
1093 case ELAN_WAIT_QUEUE_HEADER:
1094 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL)
1095 break;
1096
1097 ts->state = ELAN_STATE_NORMAL;
1098 fallthrough;
1099
1100 case ELAN_STATE_NORMAL:
1101
1102 switch (ts->buf[FW_HDR_TYPE]) {
1103 case CMD_HEADER_HELLO:
1104 case CMD_HEADER_RESP:
1105 break;
1106
1107 case QUEUE_HEADER_WAIT:
1108 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) {
1109 dev_err(&client->dev,
1110 "invalid wait packet %*ph\n",
1111 HEADER_SIZE, ts->buf);
1112 } else {
1113 ts->state = ELAN_WAIT_QUEUE_HEADER;
1114 udelay(30);
1115 }
1116 break;
1117
1118 case QUEUE_HEADER_SINGLE:
1119 elants_i2c_event(ts, &ts->buf[HEADER_SIZE],
1120 ts->buf[FW_HDR_LENGTH]);
1121 break;
1122
1123 case QUEUE_HEADER_NORMAL2: /* CMD_HEADER_REK */
1124 /*
1125 * Depending on firmware version, eKTF3624 touchscreens
1126 * may utilize one of these opcodes for the touch events:
1127 * 0x63 (NORMAL) and 0x66 (NORMAL2). The 0x63 is used by
1128 * older firmware version and differs from 0x66 such that
1129 * touch pressure value needs to be adjusted. The 0x66
1130 * opcode of newer firmware is equal to 0x63 of eKTH3500.
1131 */
1132 if (ts->chip_id != EKTF3624)
1133 break;
1134
1135 fallthrough;
1136
1137 case QUEUE_HEADER_NORMAL:
1138 report_count = ts->buf[FW_HDR_COUNT];
1139 if (report_count == 0 || report_count > 3) {
1140 dev_err(&client->dev,
1141 "bad report count: %*ph\n",
1142 HEADER_SIZE, ts->buf);
1143 break;
1144 }
1145
1146 report_len = ts->buf[FW_HDR_LENGTH] / report_count;
1147
1148 if (report_len == PACKET_SIZE_OLD &&
1149 ts->chip_id == EKTF3624) {
1150 dev_dbg_once(&client->dev,
1151 "using old report format\n");
1152 } else if (report_len != PACKET_SIZE) {
1153 dev_err(&client->dev,
1154 "mismatching report length: %*ph\n",
1155 HEADER_SIZE, ts->buf);
1156 break;
1157 }
1158
1159 for (i = 0; i < report_count; i++) {
1160 u8 *buf = ts->buf + HEADER_SIZE +
1161 i * report_len;
1162 elants_i2c_event(ts, buf, report_len);
1163 }
1164 break;
1165
1166 default:
1167 dev_err(&client->dev, "unknown packet %*ph\n",
1168 HEADER_SIZE, ts->buf);
1169 break;
1170 }
1171 break;
1172 }
1173
1174 out:
1175 return IRQ_HANDLED;
1176 }
1177
1178 /*
1179 * sysfs interface
1180 */
calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1181 static ssize_t calibrate_store(struct device *dev,
1182 struct device_attribute *attr,
1183 const char *buf, size_t count)
1184 {
1185 struct i2c_client *client = to_i2c_client(dev);
1186 struct elants_data *ts = i2c_get_clientdata(client);
1187 int error;
1188
1189 error = mutex_lock_interruptible(&ts->sysfs_mutex);
1190 if (error)
1191 return error;
1192
1193 error = elants_i2c_calibrate(ts);
1194
1195 mutex_unlock(&ts->sysfs_mutex);
1196 return error ?: count;
1197 }
1198
write_update_fw(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1199 static ssize_t write_update_fw(struct device *dev,
1200 struct device_attribute *attr,
1201 const char *buf, size_t count)
1202 {
1203 struct i2c_client *client = to_i2c_client(dev);
1204 struct elants_data *ts = i2c_get_clientdata(client);
1205 int error;
1206
1207 error = mutex_lock_interruptible(&ts->sysfs_mutex);
1208 if (error)
1209 return error;
1210
1211 error = elants_i2c_fw_update(ts);
1212 dev_dbg(dev, "firmware update result: %d\n", error);
1213
1214 mutex_unlock(&ts->sysfs_mutex);
1215 return error ?: count;
1216 }
1217
show_iap_mode(struct device * dev,struct device_attribute * attr,char * buf)1218 static ssize_t show_iap_mode(struct device *dev,
1219 struct device_attribute *attr, char *buf)
1220 {
1221 struct i2c_client *client = to_i2c_client(dev);
1222 struct elants_data *ts = i2c_get_clientdata(client);
1223
1224 return sprintf(buf, "%s\n",
1225 ts->iap_mode == ELAN_IAP_OPERATIONAL ?
1226 "Normal" : "Recovery");
1227 }
1228
show_calibration_count(struct device * dev,struct device_attribute * attr,char * buf)1229 static ssize_t show_calibration_count(struct device *dev,
1230 struct device_attribute *attr, char *buf)
1231 {
1232 struct i2c_client *client = to_i2c_client(dev);
1233 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 };
1234 u8 resp[HEADER_SIZE];
1235 u16 rek_count;
1236 int error;
1237
1238 error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
1239 resp, sizeof(resp), 1,
1240 "read ReK status");
1241 if (error)
1242 return sprintf(buf, "%d\n", error);
1243
1244 rek_count = get_unaligned_be16(&resp[2]);
1245 return sprintf(buf, "0x%04x\n", rek_count);
1246 }
1247
1248 static DEVICE_ATTR_WO(calibrate);
1249 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
1250 static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL);
1251 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
1252
1253 struct elants_version_attribute {
1254 struct device_attribute dattr;
1255 size_t field_offset;
1256 size_t field_size;
1257 };
1258
1259 #define __ELANTS_FIELD_SIZE(_field) \
1260 sizeof(((struct elants_data *)NULL)->_field)
1261 #define __ELANTS_VERIFY_SIZE(_field) \
1262 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \
1263 __ELANTS_FIELD_SIZE(_field))
1264 #define ELANTS_VERSION_ATTR(_field) \
1265 struct elants_version_attribute elants_ver_attr_##_field = { \
1266 .dattr = __ATTR(_field, S_IRUGO, \
1267 elants_version_attribute_show, NULL), \
1268 .field_offset = offsetof(struct elants_data, _field), \
1269 .field_size = __ELANTS_VERIFY_SIZE(_field), \
1270 }
1271
elants_version_attribute_show(struct device * dev,struct device_attribute * dattr,char * buf)1272 static ssize_t elants_version_attribute_show(struct device *dev,
1273 struct device_attribute *dattr,
1274 char *buf)
1275 {
1276 struct i2c_client *client = to_i2c_client(dev);
1277 struct elants_data *ts = i2c_get_clientdata(client);
1278 struct elants_version_attribute *attr =
1279 container_of(dattr, struct elants_version_attribute, dattr);
1280 u8 *field = (u8 *)((char *)ts + attr->field_offset);
1281 unsigned int fmt_size;
1282 unsigned int val;
1283
1284 if (attr->field_size == 1) {
1285 val = *field;
1286 fmt_size = 2; /* 2 HEX digits */
1287 } else {
1288 val = *(u16 *)field;
1289 fmt_size = 4; /* 4 HEX digits */
1290 }
1291
1292 return sprintf(buf, "%0*x\n", fmt_size, val);
1293 }
1294
1295 static ELANTS_VERSION_ATTR(fw_version);
1296 static ELANTS_VERSION_ATTR(hw_version);
1297 static ELANTS_VERSION_ATTR(test_version);
1298 static ELANTS_VERSION_ATTR(solution_version);
1299 static ELANTS_VERSION_ATTR(bc_version);
1300 static ELANTS_VERSION_ATTR(iap_version);
1301
1302 static struct attribute *elants_i2c_attrs[] = {
1303 &dev_attr_calibrate.attr,
1304 &dev_attr_update_fw.attr,
1305 &dev_attr_iap_mode.attr,
1306 &dev_attr_calibration_count.attr,
1307
1308 &elants_ver_attr_fw_version.dattr.attr,
1309 &elants_ver_attr_hw_version.dattr.attr,
1310 &elants_ver_attr_test_version.dattr.attr,
1311 &elants_ver_attr_solution_version.dattr.attr,
1312 &elants_ver_attr_bc_version.dattr.attr,
1313 &elants_ver_attr_iap_version.dattr.attr,
1314 NULL
1315 };
1316 ATTRIBUTE_GROUPS(elants_i2c);
1317
elants_i2c_power_on(struct elants_data * ts)1318 static int elants_i2c_power_on(struct elants_data *ts)
1319 {
1320 int error;
1321
1322 /*
1323 * If we do not have reset gpio assume platform firmware
1324 * controls regulators and does power them on for us.
1325 */
1326 if (IS_ERR_OR_NULL(ts->reset_gpio))
1327 return 0;
1328
1329 error = regulator_enable(ts->vcc33);
1330 if (error) {
1331 dev_err(&ts->client->dev,
1332 "failed to enable vcc33 regulator: %d\n",
1333 error);
1334 return error;
1335 }
1336
1337 error = regulator_enable(ts->vccio);
1338 if (error) {
1339 dev_err(&ts->client->dev,
1340 "failed to enable vccio regulator: %d\n",
1341 error);
1342 regulator_disable(ts->vcc33);
1343 return error;
1344 }
1345
1346 /*
1347 * We need to wait a bit after powering on controller before
1348 * we are allowed to release reset GPIO.
1349 */
1350 usleep_range(ELAN_POWERON_DELAY_USEC, ELAN_POWERON_DELAY_USEC + 100);
1351
1352 gpiod_set_value_cansleep(ts->reset_gpio, 0);
1353
1354 msleep(ELAN_RESET_DELAY_MSEC);
1355
1356 return 0;
1357 }
1358
elants_i2c_power_off(void * _data)1359 static void elants_i2c_power_off(void *_data)
1360 {
1361 struct elants_data *ts = _data;
1362
1363 if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
1364 /*
1365 * Activate reset gpio to prevent leakage through the
1366 * pin once we shut off power to the controller.
1367 */
1368 gpiod_set_value_cansleep(ts->reset_gpio, 1);
1369 regulator_disable(ts->vccio);
1370 regulator_disable(ts->vcc33);
1371 }
1372 }
1373
1374 #ifdef CONFIG_ACPI
1375 static const struct acpi_device_id i2c_hid_ids[] = {
1376 {"ACPI0C50", 0 },
1377 {"PNP0C50", 0 },
1378 { },
1379 };
1380
1381 static const guid_t i2c_hid_guid =
1382 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
1383 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
1384
elants_acpi_is_hid_device(struct device * dev)1385 static bool elants_acpi_is_hid_device(struct device *dev)
1386 {
1387 acpi_handle handle = ACPI_HANDLE(dev);
1388 union acpi_object *obj;
1389
1390 if (acpi_match_device_ids(ACPI_COMPANION(dev), i2c_hid_ids))
1391 return false;
1392
1393 obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, ACPI_TYPE_INTEGER);
1394 if (obj) {
1395 ACPI_FREE(obj);
1396 return true;
1397 }
1398
1399 return false;
1400 }
1401 #else
elants_acpi_is_hid_device(struct device * dev)1402 static bool elants_acpi_is_hid_device(struct device *dev)
1403 {
1404 return false;
1405 }
1406 #endif
1407
elants_i2c_probe(struct i2c_client * client)1408 static int elants_i2c_probe(struct i2c_client *client)
1409 {
1410 union i2c_smbus_data dummy;
1411 struct elants_data *ts;
1412 unsigned long irqflags;
1413 int error;
1414
1415 /* Don't bind to i2c-hid compatible devices, these are handled by the i2c-hid drv. */
1416 if (elants_acpi_is_hid_device(&client->dev)) {
1417 dev_warn(&client->dev, "This device appears to be an I2C-HID device, not binding\n");
1418 return -ENODEV;
1419 }
1420
1421 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1422 dev_err(&client->dev, "I2C check functionality error\n");
1423 return -ENXIO;
1424 }
1425
1426 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL);
1427 if (!ts)
1428 return -ENOMEM;
1429
1430 mutex_init(&ts->sysfs_mutex);
1431 init_completion(&ts->cmd_done);
1432
1433 ts->client = client;
1434 ts->chip_id = (enum elants_chip_id)(uintptr_t)device_get_match_data(&client->dev);
1435 i2c_set_clientdata(client, ts);
1436
1437 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
1438 if (IS_ERR(ts->vcc33))
1439 return dev_err_probe(&client->dev, PTR_ERR(ts->vcc33),
1440 "Failed to get 'vcc33' regulator\n");
1441
1442 ts->vccio = devm_regulator_get(&client->dev, "vccio");
1443 if (IS_ERR(ts->vccio))
1444 return dev_err_probe(&client->dev, PTR_ERR(ts->vccio),
1445 "Failed to get 'vccio' regulator\n");
1446
1447 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
1448 if (IS_ERR(ts->reset_gpio)) {
1449 error = PTR_ERR(ts->reset_gpio);
1450
1451 if (error == -EPROBE_DEFER)
1452 return error;
1453
1454 if (error != -ENOENT && error != -ENOSYS) {
1455 dev_err(&client->dev,
1456 "failed to get reset gpio: %d\n",
1457 error);
1458 return error;
1459 }
1460
1461 ts->keep_power_in_suspend = true;
1462 }
1463
1464 error = elants_i2c_power_on(ts);
1465 if (error)
1466 return error;
1467
1468 error = devm_add_action_or_reset(&client->dev,
1469 elants_i2c_power_off, ts);
1470 if (error) {
1471 dev_err(&client->dev,
1472 "failed to install power off action: %d\n", error);
1473 return error;
1474 }
1475
1476 /* Make sure there is something at this address */
1477 if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1478 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1479 dev_err(&client->dev, "nothing at this address\n");
1480 return -ENXIO;
1481 }
1482
1483 error = elants_i2c_initialize(ts);
1484 if (error) {
1485 dev_err(&client->dev, "failed to initialize: %d\n", error);
1486 return error;
1487 }
1488
1489 ts->input = devm_input_allocate_device(&client->dev);
1490 if (!ts->input) {
1491 dev_err(&client->dev, "Failed to allocate input device\n");
1492 return -ENOMEM;
1493 }
1494
1495 ts->input->name = "Elan Touchscreen";
1496 ts->input->id.bustype = BUS_I2C;
1497
1498 /* Multitouch input params setup */
1499
1500 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
1501 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
1502 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1503 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1504 input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE,
1505 0, MT_TOOL_PALM, 0, 0);
1506
1507 touchscreen_parse_properties(ts->input, true, &ts->prop);
1508
1509 if (ts->chip_id == EKTF3624 && ts->phy_x && ts->phy_y) {
1510 /* calculate resolution from size */
1511 ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, ts->phy_x);
1512 ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, ts->phy_y);
1513 }
1514
1515 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
1516 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
1517 input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, ts->major_res);
1518
1519 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
1520 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1521 if (error) {
1522 dev_err(&client->dev,
1523 "failed to initialize MT slots: %d\n", error);
1524 return error;
1525 }
1526
1527 error = input_register_device(ts->input);
1528 if (error) {
1529 dev_err(&client->dev,
1530 "unable to register input device: %d\n", error);
1531 return error;
1532 }
1533
1534 /*
1535 * Platform code (ACPI, DTS) should normally set up interrupt
1536 * for us, but in case it did not let's fall back to using falling
1537 * edge to be compatible with older Chromebooks.
1538 */
1539 irqflags = irq_get_trigger_type(client->irq);
1540 if (!irqflags)
1541 irqflags = IRQF_TRIGGER_FALLING;
1542
1543 error = devm_request_threaded_irq(&client->dev, client->irq,
1544 NULL, elants_i2c_irq,
1545 irqflags | IRQF_ONESHOT,
1546 client->name, ts);
1547 if (error) {
1548 dev_err(&client->dev, "Failed to register interrupt\n");
1549 return error;
1550 }
1551
1552 return 0;
1553 }
1554
elants_i2c_suspend(struct device * dev)1555 static int elants_i2c_suspend(struct device *dev)
1556 {
1557 struct i2c_client *client = to_i2c_client(dev);
1558 struct elants_data *ts = i2c_get_clientdata(client);
1559 const u8 set_sleep_cmd[] = {
1560 CMD_HEADER_WRITE, E_POWER_STATE_SLEEP, 0x00, 0x01
1561 };
1562 int retry_cnt;
1563 int error;
1564
1565 /* Command not support in IAP recovery mode */
1566 if (ts->iap_mode != ELAN_IAP_OPERATIONAL)
1567 return -EBUSY;
1568
1569 disable_irq(client->irq);
1570
1571 if (device_may_wakeup(dev)) {
1572 /*
1573 * The device will automatically enter idle mode
1574 * that has reduced power consumption.
1575 */
1576 return 0;
1577 } else if (ts->keep_power_in_suspend) {
1578 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1579 error = elants_i2c_send(client, set_sleep_cmd,
1580 sizeof(set_sleep_cmd));
1581 if (!error)
1582 break;
1583
1584 dev_err(&client->dev,
1585 "suspend command failed: %d\n", error);
1586 }
1587 } else {
1588 elants_i2c_power_off(ts);
1589 }
1590
1591 return 0;
1592 }
1593
elants_i2c_resume(struct device * dev)1594 static int elants_i2c_resume(struct device *dev)
1595 {
1596 struct i2c_client *client = to_i2c_client(dev);
1597 struct elants_data *ts = i2c_get_clientdata(client);
1598 const u8 set_active_cmd[] = {
1599 CMD_HEADER_WRITE, E_POWER_STATE_RESUME, 0x00, 0x01
1600 };
1601 int retry_cnt;
1602 int error;
1603
1604 if (device_may_wakeup(dev)) {
1605 elants_i2c_sw_reset(client);
1606 } else if (ts->keep_power_in_suspend) {
1607 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
1608 error = elants_i2c_send(client, set_active_cmd,
1609 sizeof(set_active_cmd));
1610 if (!error)
1611 break;
1612
1613 dev_err(&client->dev,
1614 "resume command failed: %d\n", error);
1615 }
1616 } else {
1617 elants_i2c_power_on(ts);
1618 elants_i2c_initialize(ts);
1619 }
1620
1621 ts->state = ELAN_STATE_NORMAL;
1622 enable_irq(client->irq);
1623
1624 return 0;
1625 }
1626
1627 static DEFINE_SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
1628 elants_i2c_suspend, elants_i2c_resume);
1629
1630 static const struct i2c_device_id elants_i2c_id[] = {
1631 { DEVICE_NAME, EKTH3500 },
1632 { "ekth3500", EKTH3500 },
1633 { "ektf3624", EKTF3624 },
1634 { }
1635 };
1636 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
1637
1638 #ifdef CONFIG_ACPI
1639 static const struct acpi_device_id elants_acpi_id[] = {
1640 { "ELAN0001", EKTH3500 },
1641 { }
1642 };
1643 MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
1644 #endif
1645
1646 #ifdef CONFIG_OF
1647 static const struct of_device_id elants_of_match[] = {
1648 { .compatible = "elan,ekth3500", .data = (void *)EKTH3500 },
1649 { .compatible = "elan,ektf3624", .data = (void *)EKTF3624 },
1650 { /* sentinel */ }
1651 };
1652 MODULE_DEVICE_TABLE(of, elants_of_match);
1653 #endif
1654
1655 static struct i2c_driver elants_i2c_driver = {
1656 .probe = elants_i2c_probe,
1657 .id_table = elants_i2c_id,
1658 .driver = {
1659 .name = DEVICE_NAME,
1660 .dev_groups = elants_i2c_groups,
1661 .pm = pm_sleep_ptr(&elants_i2c_pm_ops),
1662 .acpi_match_table = ACPI_PTR(elants_acpi_id),
1663 .of_match_table = of_match_ptr(elants_of_match),
1664 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1665 },
1666 };
1667 module_i2c_driver(elants_i2c_driver);
1668
1669 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>");
1670 MODULE_DESCRIPTION("Elan I2c Touchscreen driver");
1671 MODULE_LICENSE("GPL");
1672