1 /*
2  * Elan I2C/SMBus Touchpad driver - I2C interface
3  *
4  * Copyright (c) 2013 ELAN Microelectronics Corp.
5  *
6  * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
7  *
8  * Based on cyapa driver:
9  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
10  * copyright (c) 2011-2012 Google, Inc.
11  *
12  * This program is free software; you can redistribute it and/or modify it
13  * under the terms of the GNU General Public License version 2 as published
14  * by the Free Software Foundation.
15  *
16  * Trademarks are the property of their respective owners.
17  */
18 
19 #include <linux/completion.h>
20 #include <linux/delay.h>
21 #include <linux/i2c.h>
22 #include <linux/interrupt.h>
23 #include <linux/jiffies.h>
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
26 #include <asm/unaligned.h>
27 
28 #include "elan_i2c.h"
29 
30 /* Elan i2c commands */
31 #define ETP_I2C_RESET			0x0100
32 #define ETP_I2C_WAKE_UP			0x0800
33 #define ETP_I2C_SLEEP			0x0801
34 #define ETP_I2C_DESC_CMD		0x0001
35 #define ETP_I2C_REPORT_DESC_CMD		0x0002
36 #define ETP_I2C_STAND_CMD		0x0005
37 #define ETP_I2C_PATTERN_CMD		0x0100
38 #define ETP_I2C_UNIQUEID_CMD		0x0101
39 #define ETP_I2C_FW_VERSION_CMD		0x0102
40 #define ETP_I2C_IC_TYPE_CMD		0x0103
41 #define ETP_I2C_OSM_VERSION_CMD		0x0103
42 #define ETP_I2C_NSM_VERSION_CMD		0x0104
43 #define ETP_I2C_XY_TRACENUM_CMD		0x0105
44 #define ETP_I2C_MAX_X_AXIS_CMD		0x0106
45 #define ETP_I2C_MAX_Y_AXIS_CMD		0x0107
46 #define ETP_I2C_RESOLUTION_CMD		0x0108
47 #define ETP_I2C_PRESSURE_CMD		0x010A
48 #define ETP_I2C_IAP_VERSION_CMD		0x0110
49 #define ETP_I2C_SET_CMD			0x0300
50 #define ETP_I2C_POWER_CMD		0x0307
51 #define ETP_I2C_FW_CHECKSUM_CMD		0x030F
52 #define ETP_I2C_IAP_CTRL_CMD		0x0310
53 #define ETP_I2C_IAP_CMD			0x0311
54 #define ETP_I2C_IAP_RESET_CMD		0x0314
55 #define ETP_I2C_IAP_CHECKSUM_CMD	0x0315
56 #define ETP_I2C_CALIBRATE_CMD		0x0316
57 #define ETP_I2C_MAX_BASELINE_CMD	0x0317
58 #define ETP_I2C_MIN_BASELINE_CMD	0x0318
59 
60 #define ETP_I2C_REPORT_LEN		34
61 #define ETP_I2C_DESC_LENGTH		30
62 #define ETP_I2C_REPORT_DESC_LENGTH	158
63 #define ETP_I2C_INF_LENGTH		2
64 #define ETP_I2C_IAP_PASSWORD		0x1EA5
65 #define ETP_I2C_IAP_RESET		0xF0F0
66 #define ETP_I2C_MAIN_MODE_ON		(1 << 9)
67 #define ETP_I2C_IAP_REG_L		0x01
68 #define ETP_I2C_IAP_REG_H		0x06
69 
70 static int elan_i2c_read_block(struct i2c_client *client,
71 			       u16 reg, u8 *val, u16 len)
72 {
73 	__le16 buf[] = {
74 		cpu_to_le16(reg),
75 	};
76 	struct i2c_msg msgs[] = {
77 		{
78 			.addr = client->addr,
79 			.flags = client->flags & I2C_M_TEN,
80 			.len = sizeof(buf),
81 			.buf = (u8 *)buf,
82 		},
83 		{
84 			.addr = client->addr,
85 			.flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
86 			.len = len,
87 			.buf = val,
88 		}
89 	};
90 	int ret;
91 
92 	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
93 	return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
94 }
95 
96 static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
97 {
98 	int retval;
99 
100 	retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
101 	if (retval < 0) {
102 		dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
103 		return retval;
104 	}
105 
106 	return 0;
107 }
108 
109 static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
110 {
111 	__le16 buf[] = {
112 		cpu_to_le16(reg),
113 		cpu_to_le16(cmd),
114 	};
115 	struct i2c_msg msg = {
116 		.addr = client->addr,
117 		.flags = client->flags & I2C_M_TEN,
118 		.len = sizeof(buf),
119 		.buf = (u8 *)buf,
120 	};
121 	int ret;
122 
123 	ret = i2c_transfer(client->adapter, &msg, 1);
124 	if (ret != 1) {
125 		if (ret >= 0)
126 			ret = -EIO;
127 		dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
128 			reg, ret);
129 		return ret;
130 	}
131 
132 	return 0;
133 }
134 
135 static int elan_i2c_initialize(struct i2c_client *client)
136 {
137 	struct device *dev = &client->dev;
138 	int error;
139 	u8 val[256];
140 
141 	error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
142 	if (error) {
143 		dev_err(dev, "device reset failed: %d\n", error);
144 		return error;
145 	}
146 
147 	/* Wait for the device to reset */
148 	msleep(100);
149 
150 	/* get reset acknowledgement 0000 */
151 	error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
152 	if (error < 0) {
153 		dev_err(dev, "failed to read reset response: %d\n", error);
154 		return error;
155 	}
156 
157 	error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
158 				    val, ETP_I2C_DESC_LENGTH);
159 	if (error) {
160 		dev_err(dev, "cannot get device descriptor: %d\n", error);
161 		return error;
162 	}
163 
164 	error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
165 				    val, ETP_I2C_REPORT_DESC_LENGTH);
166 	if (error) {
167 		dev_err(dev, "fetching report descriptor failed.: %d\n", error);
168 		return error;
169 	}
170 
171 	return 0;
172 }
173 
174 static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
175 {
176 	return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
177 				  sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
178 }
179 
180 static int elan_i2c_power_control(struct i2c_client *client, bool enable)
181 {
182 	u8 val[2];
183 	u16 reg;
184 	int error;
185 
186 	error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
187 	if (error) {
188 		dev_err(&client->dev,
189 			"failed to read current power state: %d\n",
190 			error);
191 		return error;
192 	}
193 
194 	reg = le16_to_cpup((__le16 *)val);
195 	if (enable)
196 		reg &= ~ETP_DISABLE_POWER;
197 	else
198 		reg |= ETP_DISABLE_POWER;
199 
200 	error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg);
201 	if (error) {
202 		dev_err(&client->dev,
203 			"failed to write current power state: %d\n",
204 			error);
205 		return error;
206 	}
207 
208 	return 0;
209 }
210 
211 static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
212 {
213 	return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
214 }
215 
216 
217 static int elan_i2c_calibrate(struct i2c_client *client)
218 {
219 	return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
220 }
221 
222 static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
223 {
224 	return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
225 }
226 
227 static int elan_i2c_get_baseline_data(struct i2c_client *client,
228 				      bool max_baseline, u8 *value)
229 {
230 	int error;
231 	u8 val[3];
232 
233 	error = elan_i2c_read_cmd(client,
234 				  max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
235 						 ETP_I2C_MIN_BASELINE_CMD,
236 				  val);
237 	if (error)
238 		return error;
239 
240 	*value = le16_to_cpup((__le16 *)val);
241 
242 	return 0;
243 }
244 
245 static int elan_i2c_get_pattern(struct i2c_client *client, u8 *pattern)
246 {
247 	int error;
248 	u8 val[3];
249 
250 	error = elan_i2c_read_cmd(client, ETP_I2C_PATTERN_CMD, val);
251 	if (error) {
252 		dev_err(&client->dev, "failed to get pattern: %d\n", error);
253 		return error;
254 	}
255 	*pattern = val[1];
256 
257 	return 0;
258 }
259 
260 static int elan_i2c_get_version(struct i2c_client *client,
261 				bool iap, u8 *version)
262 {
263 	int error;
264 	u8 pattern_ver;
265 	u8 val[3];
266 
267 	error = elan_i2c_get_pattern(client, &pattern_ver);
268 	if (error) {
269 		dev_err(&client->dev, "failed to get pattern version\n");
270 		return error;
271 	}
272 
273 	error = elan_i2c_read_cmd(client,
274 				  iap ? ETP_I2C_IAP_VERSION_CMD :
275 					ETP_I2C_FW_VERSION_CMD,
276 				  val);
277 	if (error) {
278 		dev_err(&client->dev, "failed to get %s version: %d\n",
279 			iap ? "IAP" : "FW", error);
280 		return error;
281 	}
282 
283 	if (pattern_ver == 0x01)
284 		*version = iap ? val[1] : val[0];
285 	else
286 		*version = val[0];
287 	return 0;
288 }
289 
290 static int elan_i2c_get_sm_version(struct i2c_client *client,
291 				   u16 *ic_type, u8 *version,
292 				   u8 *clickpad)
293 {
294 	int error;
295 	u8 pattern_ver;
296 	u8 val[3];
297 
298 	error = elan_i2c_get_pattern(client, &pattern_ver);
299 	if (error) {
300 		dev_err(&client->dev, "failed to get pattern version\n");
301 		return error;
302 	}
303 
304 	if (pattern_ver == 0x01) {
305 		error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_CMD, val);
306 		if (error) {
307 			dev_err(&client->dev, "failed to get ic type: %d\n",
308 				error);
309 			return error;
310 		}
311 		*ic_type = be16_to_cpup((__be16 *)val);
312 
313 		error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
314 					  val);
315 		if (error) {
316 			dev_err(&client->dev, "failed to get SM version: %d\n",
317 				error);
318 			return error;
319 		}
320 		*version = val[1];
321 		*clickpad = val[0] & 0x10;
322 	} else {
323 		error = elan_i2c_read_cmd(client, ETP_I2C_OSM_VERSION_CMD, val);
324 		if (error) {
325 			dev_err(&client->dev, "failed to get SM version: %d\n",
326 				error);
327 			return error;
328 		}
329 		*version = val[0];
330 		*ic_type = val[1];
331 
332 		error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
333 					  val);
334 		if (error) {
335 			dev_err(&client->dev, "failed to get SM version: %d\n",
336 				error);
337 			return error;
338 		}
339 		*clickpad = val[0] & 0x10;
340 	}
341 
342 	return 0;
343 }
344 
345 static int elan_i2c_get_product_id(struct i2c_client *client, u16 *id)
346 {
347 	int error;
348 	u8 val[3];
349 
350 	error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
351 	if (error) {
352 		dev_err(&client->dev, "failed to get product ID: %d\n", error);
353 		return error;
354 	}
355 
356 	*id = le16_to_cpup((__le16 *)val);
357 	return 0;
358 }
359 
360 static int elan_i2c_get_checksum(struct i2c_client *client,
361 				 bool iap, u16 *csum)
362 {
363 	int error;
364 	u8 val[3];
365 
366 	error = elan_i2c_read_cmd(client,
367 				  iap ? ETP_I2C_IAP_CHECKSUM_CMD :
368 					ETP_I2C_FW_CHECKSUM_CMD,
369 				  val);
370 	if (error) {
371 		dev_err(&client->dev, "failed to get %s checksum: %d\n",
372 			iap ? "IAP" : "FW", error);
373 		return error;
374 	}
375 
376 	*csum = le16_to_cpup((__le16 *)val);
377 	return 0;
378 }
379 
380 static int elan_i2c_get_max(struct i2c_client *client,
381 			    unsigned int *max_x, unsigned int *max_y)
382 {
383 	int error;
384 	u8 val[3];
385 
386 	error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
387 	if (error) {
388 		dev_err(&client->dev, "failed to get X dimension: %d\n", error);
389 		return error;
390 	}
391 
392 	*max_x = le16_to_cpup((__le16 *)val) & 0x0fff;
393 
394 	error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
395 	if (error) {
396 		dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
397 		return error;
398 	}
399 
400 	*max_y = le16_to_cpup((__le16 *)val) & 0x0fff;
401 
402 	return 0;
403 }
404 
405 static int elan_i2c_get_resolution(struct i2c_client *client,
406 				   u8 *hw_res_x, u8 *hw_res_y)
407 {
408 	int error;
409 	u8 val[3];
410 
411 	error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
412 	if (error) {
413 		dev_err(&client->dev, "failed to get resolution: %d\n", error);
414 		return error;
415 	}
416 
417 	*hw_res_x = val[0];
418 	*hw_res_y = val[1];
419 
420 	return 0;
421 }
422 
423 static int elan_i2c_get_num_traces(struct i2c_client *client,
424 				   unsigned int *x_traces,
425 				   unsigned int *y_traces)
426 {
427 	int error;
428 	u8 val[3];
429 
430 	error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
431 	if (error) {
432 		dev_err(&client->dev, "failed to get trace info: %d\n", error);
433 		return error;
434 	}
435 
436 	*x_traces = val[0];
437 	*y_traces = val[1];
438 
439 	return 0;
440 }
441 
442 static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
443 					    int *adjustment)
444 {
445 	int error;
446 	u8 val[3];
447 
448 	error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
449 	if (error) {
450 		dev_err(&client->dev, "failed to get pressure format: %d\n",
451 			error);
452 		return error;
453 	}
454 
455 	if ((val[0] >> 4) & 0x1)
456 		*adjustment = 0;
457 	else
458 		*adjustment = ETP_PRESSURE_OFFSET;
459 
460 	return 0;
461 }
462 
463 static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
464 {
465 	int error;
466 	u16 constant;
467 	u8 val[3];
468 
469 	error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
470 	if (error) {
471 		dev_err(&client->dev,
472 			"failed to read iap control register: %d\n",
473 			error);
474 		return error;
475 	}
476 
477 	constant = le16_to_cpup((__le16 *)val);
478 	dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
479 
480 	*mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
481 
482 	return 0;
483 }
484 
485 static int elan_i2c_iap_reset(struct i2c_client *client)
486 {
487 	int error;
488 
489 	error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
490 				   ETP_I2C_IAP_RESET);
491 	if (error) {
492 		dev_err(&client->dev, "cannot reset IC: %d\n", error);
493 		return error;
494 	}
495 
496 	return 0;
497 }
498 
499 static int elan_i2c_set_flash_key(struct i2c_client *client)
500 {
501 	int error;
502 
503 	error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
504 				   ETP_I2C_IAP_PASSWORD);
505 	if (error) {
506 		dev_err(&client->dev, "cannot set flash key: %d\n", error);
507 		return error;
508 	}
509 
510 	return 0;
511 }
512 
513 static int elan_i2c_prepare_fw_update(struct i2c_client *client)
514 {
515 	struct device *dev = &client->dev;
516 	int error;
517 	enum tp_mode mode;
518 	u8 val[3];
519 	u16 password;
520 
521 	/* Get FW in which mode	(IAP_MODE/MAIN_MODE)  */
522 	error = elan_i2c_iap_get_mode(client, &mode);
523 	if (error)
524 		return error;
525 
526 	if (mode == IAP_MODE) {
527 		/* Reset IC */
528 		error = elan_i2c_iap_reset(client);
529 		if (error)
530 			return error;
531 
532 		msleep(30);
533 	}
534 
535 	/* Set flash key*/
536 	error = elan_i2c_set_flash_key(client);
537 	if (error)
538 		return error;
539 
540 	/* Wait for F/W IAP initialization */
541 	msleep(mode == MAIN_MODE ? 100 : 30);
542 
543 	/* Check if we are in IAP mode or not */
544 	error = elan_i2c_iap_get_mode(client, &mode);
545 	if (error)
546 		return error;
547 
548 	if (mode == MAIN_MODE) {
549 		dev_err(dev, "wrong mode: %d\n", mode);
550 		return -EIO;
551 	}
552 
553 	/* Set flash key again */
554 	error = elan_i2c_set_flash_key(client);
555 	if (error)
556 		return error;
557 
558 	/* Wait for F/W IAP initialization */
559 	msleep(30);
560 
561 	/* read back to check we actually enabled successfully. */
562 	error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
563 	if (error) {
564 		dev_err(dev, "cannot read iap password: %d\n",
565 			error);
566 		return error;
567 	}
568 
569 	password = le16_to_cpup((__le16 *)val);
570 	if (password != ETP_I2C_IAP_PASSWORD) {
571 		dev_err(dev, "wrong iap password: 0x%X\n", password);
572 		return -EIO;
573 	}
574 
575 	return 0;
576 }
577 
578 static int elan_i2c_write_fw_block(struct i2c_client *client,
579 				   const u8 *page, u16 checksum, int idx)
580 {
581 	struct device *dev = &client->dev;
582 	u8 page_store[ETP_FW_PAGE_SIZE + 4];
583 	u8 val[3];
584 	u16 result;
585 	int ret, error;
586 
587 	page_store[0] = ETP_I2C_IAP_REG_L;
588 	page_store[1] = ETP_I2C_IAP_REG_H;
589 	memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
590 	/* recode checksum at last two bytes */
591 	put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]);
592 
593 	ret = i2c_master_send(client, page_store, sizeof(page_store));
594 	if (ret != sizeof(page_store)) {
595 		error = ret < 0 ? ret : -EIO;
596 		dev_err(dev, "Failed to write page %d: %d\n", idx, error);
597 		return error;
598 	}
599 
600 	/* Wait for F/W to update one page ROM data. */
601 	msleep(35);
602 
603 	error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
604 	if (error) {
605 		dev_err(dev, "Failed to read IAP write result: %d\n", error);
606 		return error;
607 	}
608 
609 	result = le16_to_cpup((__le16 *)val);
610 	if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
611 		dev_err(dev, "IAP reports failed write: %04hx\n",
612 			result);
613 		return -EIO;
614 	}
615 
616 	return 0;
617 }
618 
619 static int elan_i2c_finish_fw_update(struct i2c_client *client,
620 				     struct completion *completion)
621 {
622 	struct device *dev = &client->dev;
623 	int error;
624 	int len;
625 	u8 buffer[ETP_I2C_REPORT_LEN];
626 
627 	len = i2c_master_recv(client, buffer, ETP_I2C_REPORT_LEN);
628 	if (len != ETP_I2C_REPORT_LEN) {
629 		error = len < 0 ? len : -EIO;
630 		dev_warn(dev, "failed to read I2C data after FW WDT reset: %d (%d)\n",
631 			error, len);
632 	}
633 
634 	reinit_completion(completion);
635 	enable_irq(client->irq);
636 
637 	error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
638 	if (error) {
639 		dev_err(dev, "device reset failed: %d\n", error);
640 	} else if (!wait_for_completion_timeout(completion,
641 						msecs_to_jiffies(300))) {
642 		dev_err(dev, "timeout waiting for device reset\n");
643 		error = -ETIMEDOUT;
644 	}
645 
646 	disable_irq(client->irq);
647 
648 	if (error)
649 		return error;
650 
651 	len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
652 	if (len != ETP_I2C_INF_LENGTH) {
653 		error = len < 0 ? len : -EIO;
654 		dev_err(dev, "failed to read INT signal: %d (%d)\n",
655 			error, len);
656 		return error;
657 	}
658 
659 	return 0;
660 }
661 
662 static int elan_i2c_get_report(struct i2c_client *client, u8 *report)
663 {
664 	int len;
665 
666 	len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN);
667 	if (len < 0) {
668 		dev_err(&client->dev, "failed to read report data: %d\n", len);
669 		return len;
670 	}
671 
672 	if (len != ETP_I2C_REPORT_LEN) {
673 		dev_err(&client->dev,
674 			"wrong report length (%d vs %d expected)\n",
675 			len, ETP_I2C_REPORT_LEN);
676 		return -EIO;
677 	}
678 
679 	return 0;
680 }
681 
682 const struct elan_transport_ops elan_i2c_ops = {
683 	.initialize		= elan_i2c_initialize,
684 	.sleep_control		= elan_i2c_sleep_control,
685 	.power_control		= elan_i2c_power_control,
686 	.set_mode		= elan_i2c_set_mode,
687 
688 	.calibrate		= elan_i2c_calibrate,
689 	.calibrate_result	= elan_i2c_calibrate_result,
690 
691 	.get_baseline_data	= elan_i2c_get_baseline_data,
692 
693 	.get_version		= elan_i2c_get_version,
694 	.get_sm_version		= elan_i2c_get_sm_version,
695 	.get_product_id		= elan_i2c_get_product_id,
696 	.get_checksum		= elan_i2c_get_checksum,
697 	.get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
698 
699 	.get_max		= elan_i2c_get_max,
700 	.get_resolution		= elan_i2c_get_resolution,
701 	.get_num_traces		= elan_i2c_get_num_traces,
702 
703 	.iap_get_mode		= elan_i2c_iap_get_mode,
704 	.iap_reset		= elan_i2c_iap_reset,
705 
706 	.prepare_fw_update	= elan_i2c_prepare_fw_update,
707 	.write_fw_block		= elan_i2c_write_fw_block,
708 	.finish_fw_update	= elan_i2c_finish_fw_update,
709 
710 	.get_pattern		= elan_i2c_get_pattern,
711 
712 	.get_report		= elan_i2c_get_report,
713 };
714