summaryrefslogtreecommitdiff
path: root/drivers/input/mouse/elan_i2c_smbus.c
blob: ff36a366b2aa1aadbe3c9a7f0e9de3eb687d83c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
/*
 * Elan I2C/SMBus Touchpad driver - SMBus interface
 *
 * Copyright (c) 2013 ELAN Microelectronics Corp.
 *
 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
 *
 * Based on cyapa driver:
 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
 * copyright (c) 2011-2012 Google, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * Trademarks are the property of their respective owners.
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>

#include "elan_i2c.h"

/* Elan SMbus commands */
#define ETP_SMBUS_IAP_CMD		0x00
#define ETP_SMBUS_ENABLE_TP		0x20
#define ETP_SMBUS_SLEEP_CMD		0x21
#define ETP_SMBUS_IAP_PASSWORD_WRITE	0x29
#define ETP_SMBUS_IAP_PASSWORD_READ	0x80
#define ETP_SMBUS_WRITE_FW_BLOCK	0x2A
#define ETP_SMBUS_IAP_RESET_CMD		0x2B
#define ETP_SMBUS_RANGE_CMD		0xA0
#define ETP_SMBUS_FW_VERSION_CMD	0xA1
#define ETP_SMBUS_XY_TRACENUM_CMD	0xA2
#define ETP_SMBUS_SM_VERSION_CMD	0xA3
#define ETP_SMBUS_UNIQUEID_CMD		0xA3
#define ETP_SMBUS_RESOLUTION_CMD	0xA4
#define ETP_SMBUS_HELLOPACKET_CMD	0xA7
#define ETP_SMBUS_PACKET_QUERY		0xA8
#define ETP_SMBUS_IAP_VERSION_CMD	0xAC
#define ETP_SMBUS_IAP_CTRL_CMD		0xAD
#define ETP_SMBUS_IAP_CHECKSUM_CMD	0xAE
#define ETP_SMBUS_FW_CHECKSUM_CMD	0xAF
#define ETP_SMBUS_MAX_BASELINE_CMD	0xC3
#define ETP_SMBUS_MIN_BASELINE_CMD	0xC4
#define ETP_SMBUS_CALIBRATE_QUERY	0xC5

#define ETP_SMBUS_REPORT_LEN		32
#define ETP_SMBUS_REPORT_OFFSET		2
#define ETP_SMBUS_HELLOPACKET_LEN	5
#define ETP_SMBUS_IAP_PASSWORD		0x1234
#define ETP_SMBUS_IAP_MODE_ON		(1 << 6)

static int elan_smbus_initialize(struct i2c_client *client)
{
	u8 check[ETP_SMBUS_HELLOPACKET_LEN] = { 0x55, 0x55, 0x55, 0x55, 0x55 };
	u8 values[ETP_SMBUS_HELLOPACKET_LEN] = { 0, 0, 0, 0, 0 };
	int len, error;

	/* Get hello packet */
	len = i2c_smbus_read_block_data(client,
					ETP_SMBUS_HELLOPACKET_CMD, values);
	if (len != ETP_SMBUS_HELLOPACKET_LEN) {
		dev_err(&client->dev, "hello packet length fail: %d\n", len);
		error = len < 0 ? len : -EIO;
		return error;
	}

	/* compare hello packet */
	if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
		dev_err(&client->dev, "hello packet fail [%*ph]\n",
			ETP_SMBUS_HELLOPACKET_LEN, values);
		return -ENXIO;
	}

	/* enable tp */
	error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
	if (error) {
		dev_err(&client->dev, "failed to enable touchpad: %d\n", error);
		return error;
	}

	return 0;
}

static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
{
	u8 cmd[4] = { 0x00, 0x07, 0x00, mode };

	return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
					  sizeof(cmd), cmd);
}

static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
{
	if (sleep)
		return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD);
	else
		return 0; /* XXX should we send ETP_SMBUS_ENABLE_TP here? */
}

static int elan_smbus_power_control(struct i2c_client *client, bool enable)
{
	return 0; /* A no-op */
}

static int elan_smbus_calibrate(struct i2c_client *client)
{
	u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 };

	return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
					  sizeof(cmd), cmd);
}

static int elan_smbus_calibrate_result(struct i2c_client *client, u8 *val)
{
	int error;

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_CALIBRATE_QUERY, val);
	if (error < 0)
		return error;

	return 0;
}

static int elan_smbus_get_baseline_data(struct i2c_client *client,
					bool max_baseline, u8 *value)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  max_baseline ?
						ETP_SMBUS_MAX_BASELINE_CMD :
						ETP_SMBUS_MIN_BASELINE_CMD,
					  val);
	if (error < 0)
		return error;

	*value = be16_to_cpup((__be16 *)val);

	return 0;
}

static int elan_smbus_get_version(struct i2c_client *client,
				  bool iap, u8 *version)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  iap ? ETP_SMBUS_IAP_VERSION_CMD :
						ETP_SMBUS_FW_VERSION_CMD,
					  val);
	if (error < 0) {
		dev_err(&client->dev, "failed to get %s version: %d\n",
			iap ? "IAP" : "FW", error);
		return error;
	}

	*version = val[2];
	return 0;
}

static int elan_smbus_get_sm_version(struct i2c_client *client,
				     u8 *ic_type, u8 *version)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_SM_VERSION_CMD, val);
	if (error < 0) {
		dev_err(&client->dev, "failed to get SM version: %d\n", error);
		return error;
	}

	*version = val[0];
	*ic_type = val[1];
	return 0;
}

static int elan_smbus_get_product_id(struct i2c_client *client, u8 *id)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_UNIQUEID_CMD, val);
	if (error < 0) {
		dev_err(&client->dev, "failed to get product ID: %d\n", error);
		return error;
	}

	*id = val[1];
	return 0;
}

static int elan_smbus_get_checksum(struct i2c_client *client,
				   bool iap, u16 *csum)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  iap ? ETP_SMBUS_FW_CHECKSUM_CMD :
						ETP_SMBUS_IAP_CHECKSUM_CMD,
					  val);
	if (error < 0) {
		dev_err(&client->dev, "failed to get %s checksum: %d\n",
			iap ? "IAP" : "FW", error);
		return error;
	}

	*csum = be16_to_cpup((__be16 *)val);
	return 0;
}

static int elan_smbus_get_max(struct i2c_client *client,
			      unsigned int *max_x, unsigned int *max_y)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
	if (error) {
		dev_err(&client->dev, "failed to get dimensions: %d\n", error);
		return error;
	}

	*max_x = (0x0f & val[0]) << 8 | val[1];
	*max_y = (0xf0 & val[0]) << 4 | val[2];

	return 0;
}

static int elan_smbus_get_resolution(struct i2c_client *client,
				     u8 *hw_res_x, u8 *hw_res_y)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_RESOLUTION_CMD, val);
	if (error) {
		dev_err(&client->dev, "failed to get resolution: %d\n", error);
		return error;
	}

	*hw_res_x = val[1] & 0x0F;
	*hw_res_y = (val[1] & 0xF0) >> 4;

	return 0;
}

static int elan_smbus_get_num_traces(struct i2c_client *client,
				     unsigned int *x_traces,
				     unsigned int *y_traces)
{
	int error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_XY_TRACENUM_CMD, val);
	if (error) {
		dev_err(&client->dev, "failed to get trace info: %d\n", error);
		return error;
	}

	*x_traces = val[1];
	*y_traces = val[2];

	return 0;
}

static int elan_smbus_get_pressure_adjustment(struct i2c_client *client,
					      int *adjustment)
{
	*adjustment = ETP_PRESSURE_OFFSET;
	return 0;
}

static int elan_smbus_iap_get_mode(struct i2c_client *client,
				   enum tp_mode *mode)
{
	int error;
	u16 constant;
	u8 val[3];

	error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val);
	if (error < 0) {
		dev_err(&client->dev, "failed to read iap ctrol register: %d\n",
			error);
		return error;
	}

	constant = be16_to_cpup((__be16 *)val);
	dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);

	*mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE;

	return 0;
}

static int elan_smbus_iap_reset(struct i2c_client *client)
{
	int error;

	error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD);
	if (error) {
		dev_err(&client->dev, "cannot reset IC: %d\n", error);
		return error;
	}

	return 0;
}

static int elan_smbus_set_flash_key(struct i2c_client *client)
{
	int error;
	u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A };

	error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
					   sizeof(cmd), cmd);
	if (error) {
		dev_err(&client->dev, "cannot set flash key: %d\n", error);
		return error;
	}

	return 0;
}

static int elan_smbus_prepare_fw_update(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	int len;
	int error;
	enum tp_mode mode;
	u8 val[3];
	u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
	u16 password;

	/* Get FW in which mode	(IAP_MODE/MAIN_MODE)  */
	error = elan_smbus_iap_get_mode(client, &mode);
	if (error)
		return error;

	if (mode == MAIN_MODE) {

		/* set flash key */
		error = elan_smbus_set_flash_key(client);
		if (error)
			return error;

		/* write iap password */
		if (i2c_smbus_write_byte(client,
					 ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
			dev_err(dev, "cannot write iap password\n");
			return -EIO;
		}

		error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
						   sizeof(cmd), cmd);
		if (error) {
			dev_err(dev, "failed to write iap password: %d\n",
				error);
			return error;
		}

		/*
		 * Read back password to make sure we enabled flash
		 * successfully.
		 */
		len = i2c_smbus_read_block_data(client,
						ETP_SMBUS_IAP_PASSWORD_READ,
						val);
		if (len < sizeof(u16)) {
			error = len < 0 ? len : -EIO;
			dev_err(dev, "failed to read iap password: %d\n",
				error);
			return error;
		}

		password = be16_to_cpup((__be16 *)val);
		if (password != ETP_SMBUS_IAP_PASSWORD) {
			dev_err(dev, "wrong iap password = 0x%X\n", password);
			return -EIO;
		}

		/* Wait 30ms for MAIN_MODE change to IAP_MODE */
		msleep(30);
	}

	error = elan_smbus_set_flash_key(client);
	if (error)
		return error;

	/* Reset IC */
	error = elan_smbus_iap_reset(client);
	if (error)
		return error;

	return 0;
}


static int elan_smbus_write_fw_block(struct i2c_client *client,
				     const u8 *page, u16 checksum, int idx)
{
	struct device *dev = &client->dev;
	int error;
	u16 result;
	u8 val[3];

	/*
	 * Due to the limitation of smbus protocol limiting
	 * transfer to 32 bytes at a time, we must split block
	 * in 2 transfers.
	 */
	error = i2c_smbus_write_block_data(client,
					   ETP_SMBUS_WRITE_FW_BLOCK,
					   ETP_FW_PAGE_SIZE / 2,
					   page);
	if (error) {
		dev_err(dev, "Failed to write page %d (part %d): %d\n",
			idx, 1, error);
		return error;
	}

	error = i2c_smbus_write_block_data(client,
					   ETP_SMBUS_WRITE_FW_BLOCK,
					   ETP_FW_PAGE_SIZE / 2,
					   page + ETP_FW_PAGE_SIZE / 2);
	if (error) {
		dev_err(dev, "Failed to write page %d (part %d): %d\n",
			idx, 2, error);
		return error;
	}


	/* Wait for F/W to update one page ROM data. */
	usleep_range(8000, 10000);

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_IAP_CTRL_CMD, val);
	if (error < 0) {
		dev_err(dev, "Failed to read IAP write result: %d\n",
			error);
		return error;
	}

	result = be16_to_cpup((__be16 *)val);
	if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
		dev_err(dev, "IAP reports failed write: %04hx\n",
			result);
		return -EIO;
	}

	return 0;
}

static int elan_smbus_get_report(struct i2c_client *client, u8 *report)
{
	int len;

	len = i2c_smbus_read_block_data(client,
					ETP_SMBUS_PACKET_QUERY,
					&report[ETP_SMBUS_REPORT_OFFSET]);
	if (len < 0) {
		dev_err(&client->dev, "failed to read report data: %d\n", len);
		return len;
	}

	if (len != ETP_SMBUS_REPORT_LEN) {
		dev_err(&client->dev,
			"wrong report length (%d vs %d expected)\n",
			len, ETP_SMBUS_REPORT_LEN);
		return -EIO;
	}

	return 0;
}

static int elan_smbus_finish_fw_update(struct i2c_client *client,
				       struct completion *fw_completion)
{
	/* No special handling unlike I2C transport */
	return 0;
}

const struct elan_transport_ops elan_smbus_ops = {
	.initialize		= elan_smbus_initialize,
	.sleep_control		= elan_smbus_sleep_control,
	.power_control		= elan_smbus_power_control,
	.set_mode		= elan_smbus_set_mode,

	.calibrate		= elan_smbus_calibrate,
	.calibrate_result	= elan_smbus_calibrate_result,

	.get_baseline_data	= elan_smbus_get_baseline_data,

	.get_version		= elan_smbus_get_version,
	.get_sm_version		= elan_smbus_get_sm_version,
	.get_product_id		= elan_smbus_get_product_id,
	.get_checksum		= elan_smbus_get_checksum,
	.get_pressure_adjustment = elan_smbus_get_pressure_adjustment,

	.get_max		= elan_smbus_get_max,
	.get_resolution		= elan_smbus_get_resolution,
	.get_num_traces		= elan_smbus_get_num_traces,

	.iap_get_mode		= elan_smbus_iap_get_mode,
	.iap_reset		= elan_smbus_iap_reset,

	.prepare_fw_update	= elan_smbus_prepare_fw_update,
	.write_fw_block		= elan_smbus_write_fw_block,
	.finish_fw_update	= elan_smbus_finish_fw_update,

	.get_report		= elan_smbus_get_report,
};