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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_UNIQUEID_CMD 0x0101
38#define ETP_I2C_FW_VERSION_CMD 0x0102
39#define ETP_I2C_SM_VERSION_CMD 0x0103
40#define ETP_I2C_XY_TRACENUM_CMD 0x0105
41#define ETP_I2C_MAX_X_AXIS_CMD 0x0106
42#define ETP_I2C_MAX_Y_AXIS_CMD 0x0107
43#define ETP_I2C_RESOLUTION_CMD 0x0108
44#define ETP_I2C_PRESSURE_CMD 0x010A
45#define ETP_I2C_IAP_VERSION_CMD 0x0110
46#define ETP_I2C_SET_CMD 0x0300
47#define ETP_I2C_POWER_CMD 0x0307
48#define ETP_I2C_FW_CHECKSUM_CMD 0x030F
49#define ETP_I2C_IAP_CTRL_CMD 0x0310
50#define ETP_I2C_IAP_CMD 0x0311
51#define ETP_I2C_IAP_RESET_CMD 0x0314
52#define ETP_I2C_IAP_CHECKSUM_CMD 0x0315
53#define ETP_I2C_CALIBRATE_CMD 0x0316
54#define ETP_I2C_MAX_BASELINE_CMD 0x0317
55#define ETP_I2C_MIN_BASELINE_CMD 0x0318
56
57#define ETP_I2C_REPORT_LEN 34
58#define ETP_I2C_DESC_LENGTH 30
59#define ETP_I2C_REPORT_DESC_LENGTH 158
60#define ETP_I2C_INF_LENGTH 2
61#define ETP_I2C_IAP_PASSWORD 0x1EA5
62#define ETP_I2C_IAP_RESET 0xF0F0
63#define ETP_I2C_MAIN_MODE_ON (1 << 9)
64#define ETP_I2C_IAP_REG_L 0x01
65#define ETP_I2C_IAP_REG_H 0x06
66
67static int elan_i2c_read_block(struct i2c_client *client,
68 u16 reg, u8 *val, u16 len)
69{
70 __le16 buf[] = {
71 cpu_to_le16(reg),
72 };
73 struct i2c_msg msgs[] = {
74 {
75 .addr = client->addr,
76 .flags = client->flags & I2C_M_TEN,
77 .len = sizeof(buf),
78 .buf = (u8 *)buf,
79 },
80 {
81 .addr = client->addr,
82 .flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
83 .len = len,
84 .buf = val,
85 }
86 };
87 int ret;
88
89 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
90 return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
91}
92
93static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
94{
95 int retval;
96
97 retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
98 if (retval < 0) {
99 dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
100 return retval;
101 }
102
103 return 0;
104}
105
106static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
107{
108 __le16 buf[] = {
109 cpu_to_le16(reg),
110 cpu_to_le16(cmd),
111 };
112 struct i2c_msg msg = {
113 .addr = client->addr,
114 .flags = client->flags & I2C_M_TEN,
115 .len = sizeof(buf),
116 .buf = (u8 *)buf,
117 };
118 int ret;
119
120 ret = i2c_transfer(client->adapter, &msg, 1);
121 if (ret != 1) {
122 if (ret >= 0)
123 ret = -EIO;
124 dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
125 reg, ret);
126 return ret;
127 }
128
129 return 0;
130}
131
132static int elan_i2c_initialize(struct i2c_client *client)
133{
134 struct device *dev = &client->dev;
135 int error;
136 u8 val[256];
137
138 error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
139 if (error) {
140 dev_err(dev, "device reset failed: %d\n", error);
141 return error;
142 }
143
144 /* Wait for the device to reset */
145 msleep(100);
146
147 /* get reset acknowledgement 0000 */
148 error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
149 if (error < 0) {
150 dev_err(dev, "failed to read reset response: %d\n", error);
151 return error;
152 }
153
154 error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
155 val, ETP_I2C_DESC_LENGTH);
156 if (error) {
157 dev_err(dev, "cannot get device descriptor: %d\n", error);
158 return error;
159 }
160
161 error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
162 val, ETP_I2C_REPORT_DESC_LENGTH);
163 if (error) {
164 dev_err(dev, "fetching report descriptor failed.: %d\n", error);
165 return error;
166 }
167
168 return 0;
169}
170
171static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
172{
173 return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
174 sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
175}
176
177static int elan_i2c_power_control(struct i2c_client *client, bool enable)
178{
179 u8 val[2];
180 u16 reg;
181 int error;
182
183 error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
184 if (error) {
185 dev_err(&client->dev,
186 "failed to read current power state: %d\n",
187 error);
188 return error;
189 }
190
191 reg = le16_to_cpup((__le16 *)val);
192 if (enable)
193 reg &= ~ETP_DISABLE_POWER;
194 else
195 reg |= ETP_DISABLE_POWER;
196
197 error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg);
198 if (error) {
199 dev_err(&client->dev,
200 "failed to write current power state: %d\n",
201 error);
202 return error;
203 }
204
205 return 0;
206}
207
208static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
209{
210 return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
211}
212
213
214static int elan_i2c_calibrate(struct i2c_client *client)
215{
216 return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
217}
218
219static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
220{
221 return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
222}
223
224static int elan_i2c_get_baseline_data(struct i2c_client *client,
225 bool max_baseline, u8 *value)
226{
227 int error;
228 u8 val[3];
229
230 error = elan_i2c_read_cmd(client,
231 max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
232 ETP_I2C_MIN_BASELINE_CMD,
233 val);
234 if (error)
235 return error;
236
237 *value = le16_to_cpup((__le16 *)val);
238
239 return 0;
240}
241
242static int elan_i2c_get_version(struct i2c_client *client,
243 bool iap, u8 *version)
244{
245 int error;
246 u8 val[3];
247
248 error = elan_i2c_read_cmd(client,
249 iap ? ETP_I2C_IAP_VERSION_CMD :
250 ETP_I2C_FW_VERSION_CMD,
251 val);
252 if (error) {
253 dev_err(&client->dev, "failed to get %s version: %d\n",
254 iap ? "IAP" : "FW", error);
255 return error;
256 }
257
258 *version = val[0];
259 return 0;
260}
261
262static int elan_i2c_get_sm_version(struct i2c_client *client,
263 u8 *ic_type, u8 *version)
264{
265 int error;
266 u8 val[3];
267
268 error = elan_i2c_read_cmd(client, ETP_I2C_SM_VERSION_CMD, val);
269 if (error) {
270 dev_err(&client->dev, "failed to get SM version: %d\n", error);
271 return error;
272 }
273
274 *version = val[0];
275 *ic_type = val[1];
276 return 0;
277}
278
279static int elan_i2c_get_product_id(struct i2c_client *client, u16 *id)
280{
281 int error;
282 u8 val[3];
283
284 error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
285 if (error) {
286 dev_err(&client->dev, "failed to get product ID: %d\n", error);
287 return error;
288 }
289
290 *id = le16_to_cpup((__le16 *)val);
291 return 0;
292}
293
294static int elan_i2c_get_checksum(struct i2c_client *client,
295 bool iap, u16 *csum)
296{
297 int error;
298 u8 val[3];
299
300 error = elan_i2c_read_cmd(client,
301 iap ? ETP_I2C_IAP_CHECKSUM_CMD :
302 ETP_I2C_FW_CHECKSUM_CMD,
303 val);
304 if (error) {
305 dev_err(&client->dev, "failed to get %s checksum: %d\n",
306 iap ? "IAP" : "FW", error);
307 return error;
308 }
309
310 *csum = le16_to_cpup((__le16 *)val);
311 return 0;
312}
313
314static int elan_i2c_get_max(struct i2c_client *client,
315 unsigned int *max_x, unsigned int *max_y)
316{
317 int error;
318 u8 val[3];
319
320 error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
321 if (error) {
322 dev_err(&client->dev, "failed to get X dimension: %d\n", error);
323 return error;
324 }
325
326 *max_x = le16_to_cpup((__le16 *)val) & 0x0fff;
327
328 error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
329 if (error) {
330 dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
331 return error;
332 }
333
334 *max_y = le16_to_cpup((__le16 *)val) & 0x0fff;
335
336 return 0;
337}
338
339static int elan_i2c_get_resolution(struct i2c_client *client,
340 u8 *hw_res_x, u8 *hw_res_y)
341{
342 int error;
343 u8 val[3];
344
345 error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
346 if (error) {
347 dev_err(&client->dev, "failed to get resolution: %d\n", error);
348 return error;
349 }
350
351 *hw_res_x = val[0];
352 *hw_res_y = val[1];
353
354 return 0;
355}
356
357static int elan_i2c_get_num_traces(struct i2c_client *client,
358 unsigned int *x_traces,
359 unsigned int *y_traces)
360{
361 int error;
362 u8 val[3];
363
364 error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
365 if (error) {
366 dev_err(&client->dev, "failed to get trace info: %d\n", error);
367 return error;
368 }
369
370 *x_traces = val[0];
371 *y_traces = val[1];
372
373 return 0;
374}
375
376static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
377 int *adjustment)
378{
379 int error;
380 u8 val[3];
381
382 error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
383 if (error) {
384 dev_err(&client->dev, "failed to get pressure format: %d\n",
385 error);
386 return error;
387 }
388
389 if ((val[0] >> 4) & 0x1)
390 *adjustment = 0;
391 else
392 *adjustment = ETP_PRESSURE_OFFSET;
393
394 return 0;
395}
396
397static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
398{
399 int error;
400 u16 constant;
401 u8 val[3];
402
403 error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
404 if (error) {
405 dev_err(&client->dev,
406 "failed to read iap control register: %d\n",
407 error);
408 return error;
409 }
410
411 constant = le16_to_cpup((__le16 *)val);
412 dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
413
414 *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
415
416 return 0;
417}
418
419static int elan_i2c_iap_reset(struct i2c_client *client)
420{
421 int error;
422
423 error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
424 ETP_I2C_IAP_RESET);
425 if (error) {
426 dev_err(&client->dev, "cannot reset IC: %d\n", error);
427 return error;
428 }
429
430 return 0;
431}
432
433static int elan_i2c_set_flash_key(struct i2c_client *client)
434{
435 int error;
436
437 error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
438 ETP_I2C_IAP_PASSWORD);
439 if (error) {
440 dev_err(&client->dev, "cannot set flash key: %d\n", error);
441 return error;
442 }
443
444 return 0;
445}
446
447static int elan_i2c_prepare_fw_update(struct i2c_client *client)
448{
449 struct device *dev = &client->dev;
450 int error;
451 enum tp_mode mode;
452 u8 val[3];
453 u16 password;
454
455 /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
456 error = elan_i2c_iap_get_mode(client, &mode);
457 if (error)
458 return error;
459
460 if (mode == IAP_MODE) {
461 /* Reset IC */
462 error = elan_i2c_iap_reset(client);
463 if (error)
464 return error;
465
466 msleep(30);
467 }
468
469 /* Set flash key*/
470 error = elan_i2c_set_flash_key(client);
471 if (error)
472 return error;
473
474 /* Wait for F/W IAP initialization */
475 msleep(mode == MAIN_MODE ? 100 : 30);
476
477 /* Check if we are in IAP mode or not */
478 error = elan_i2c_iap_get_mode(client, &mode);
479 if (error)
480 return error;
481
482 if (mode == MAIN_MODE) {
483 dev_err(dev, "wrong mode: %d\n", mode);
484 return -EIO;
485 }
486
487 /* Set flash key again */
488 error = elan_i2c_set_flash_key(client);
489 if (error)
490 return error;
491
492 /* Wait for F/W IAP initialization */
493 msleep(30);
494
495 /* read back to check we actually enabled successfully. */
496 error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
497 if (error) {
498 dev_err(dev, "cannot read iap password: %d\n",
499 error);
500 return error;
501 }
502
503 password = le16_to_cpup((__le16 *)val);
504 if (password != ETP_I2C_IAP_PASSWORD) {
505 dev_err(dev, "wrong iap password: 0x%X\n", password);
506 return -EIO;
507 }
508
509 return 0;
510}
511
512static int elan_i2c_write_fw_block(struct i2c_client *client,
513 const u8 *page, u16 checksum, int idx)
514{
515 struct device *dev = &client->dev;
516 u8 page_store[ETP_FW_PAGE_SIZE + 4];
517 u8 val[3];
518 u16 result;
519 int ret, error;
520
521 page_store[0] = ETP_I2C_IAP_REG_L;
522 page_store[1] = ETP_I2C_IAP_REG_H;
523 memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
524 /* recode checksum at last two bytes */
525 put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]);
526
527 ret = i2c_master_send(client, page_store, sizeof(page_store));
528 if (ret != sizeof(page_store)) {
529 error = ret < 0 ? ret : -EIO;
530 dev_err(dev, "Failed to write page %d: %d\n", idx, error);
531 return error;
532 }
533
534 /* Wait for F/W to update one page ROM data. */
535 msleep(20);
536
537 error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
538 if (error) {
539 dev_err(dev, "Failed to read IAP write result: %d\n", error);
540 return error;
541 }
542
543 result = le16_to_cpup((__le16 *)val);
544 if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
545 dev_err(dev, "IAP reports failed write: %04hx\n",
546 result);
547 return -EIO;
548 }
549
550 return 0;
551}
552
553static int elan_i2c_finish_fw_update(struct i2c_client *client,
554 struct completion *completion)
555{
556 struct device *dev = &client->dev;
557 long ret;
558 int error;
559 int len;
560 u8 buffer[ETP_I2C_INF_LENGTH];
561
562 reinit_completion(completion);
563 enable_irq(client->irq);
564
565 error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
566 if (!error)
567 ret = wait_for_completion_interruptible_timeout(completion,
568 msecs_to_jiffies(300));
569 disable_irq(client->irq);
570
571 if (error) {
572 dev_err(dev, "device reset failed: %d\n", error);
573 return error;
574 } else if (ret == 0) {
575 dev_err(dev, "timeout waiting for device reset\n");
576 return -ETIMEDOUT;
577 } else if (ret < 0) {
578 error = ret;
579 dev_err(dev, "error waiting for device reset: %d\n", error);
580 return error;
581 }
582
583 len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
584 if (len != ETP_I2C_INF_LENGTH) {
585 error = len < 0 ? len : -EIO;
586 dev_err(dev, "failed to read INT signal: %d (%d)\n",
587 error, len);
588 return error;
589 }
590
591 return 0;
592}
593
594static int elan_i2c_get_report(struct i2c_client *client, u8 *report)
595{
596 int len;
597
598 len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN);
599 if (len < 0) {
600 dev_err(&client->dev, "failed to read report data: %d\n", len);
601 return len;
602 }
603
604 if (len != ETP_I2C_REPORT_LEN) {
605 dev_err(&client->dev,
606 "wrong report length (%d vs %d expected)\n",
607 len, ETP_I2C_REPORT_LEN);
608 return -EIO;
609 }
610
611 return 0;
612}
613
614const struct elan_transport_ops elan_i2c_ops = {
615 .initialize = elan_i2c_initialize,
616 .sleep_control = elan_i2c_sleep_control,
617 .power_control = elan_i2c_power_control,
618 .set_mode = elan_i2c_set_mode,
619
620 .calibrate = elan_i2c_calibrate,
621 .calibrate_result = elan_i2c_calibrate_result,
622
623 .get_baseline_data = elan_i2c_get_baseline_data,
624
625 .get_version = elan_i2c_get_version,
626 .get_sm_version = elan_i2c_get_sm_version,
627 .get_product_id = elan_i2c_get_product_id,
628 .get_checksum = elan_i2c_get_checksum,
629 .get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
630
631 .get_max = elan_i2c_get_max,
632 .get_resolution = elan_i2c_get_resolution,
633 .get_num_traces = elan_i2c_get_num_traces,
634
635 .iap_get_mode = elan_i2c_iap_get_mode,
636 .iap_reset = elan_i2c_iap_reset,
637
638 .prepare_fw_update = elan_i2c_prepare_fw_update,
639 .write_fw_block = elan_i2c_write_fw_block,
640 .finish_fw_update = elan_i2c_finish_fw_update,
641
642 .get_report = elan_i2c_get_report,
643};