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16#include <linux/delay.h>
17#include <linux/i2c.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20
21#include "elan_i2c.h"
22
23
24#define ETP_SMBUS_IAP_CMD 0x00
25#define ETP_SMBUS_ENABLE_TP 0x20
26#define ETP_SMBUS_SLEEP_CMD 0x21
27#define ETP_SMBUS_IAP_PASSWORD_WRITE 0x29
28#define ETP_SMBUS_IAP_PASSWORD_READ 0x80
29#define ETP_SMBUS_WRITE_FW_BLOCK 0x2A
30#define ETP_SMBUS_IAP_RESET_CMD 0x2B
31#define ETP_SMBUS_RANGE_CMD 0xA0
32#define ETP_SMBUS_FW_VERSION_CMD 0xA1
33#define ETP_SMBUS_XY_TRACENUM_CMD 0xA2
34#define ETP_SMBUS_SM_VERSION_CMD 0xA3
35#define ETP_SMBUS_UNIQUEID_CMD 0xA3
36#define ETP_SMBUS_RESOLUTION_CMD 0xA4
37#define ETP_SMBUS_HELLOPACKET_CMD 0xA7
38#define ETP_SMBUS_PACKET_QUERY 0xA8
39#define ETP_SMBUS_IAP_VERSION_CMD 0xAC
40#define ETP_SMBUS_IAP_CTRL_CMD 0xAD
41#define ETP_SMBUS_IAP_CHECKSUM_CMD 0xAE
42#define ETP_SMBUS_FW_CHECKSUM_CMD 0xAF
43#define ETP_SMBUS_MAX_BASELINE_CMD 0xC3
44#define ETP_SMBUS_MIN_BASELINE_CMD 0xC4
45#define ETP_SMBUS_CALIBRATE_QUERY 0xC5
46
47#define ETP_SMBUS_REPORT_LEN 32
48#define ETP_SMBUS_REPORT_OFFSET 2
49#define ETP_SMBUS_HELLOPACKET_LEN 5
50#define ETP_SMBUS_IAP_PASSWORD 0x1234
51#define ETP_SMBUS_IAP_MODE_ON (1 << 6)
52
53static int elan_smbus_initialize(struct i2c_client *client)
54{
55 u8 check[ETP_SMBUS_HELLOPACKET_LEN] = { 0x55, 0x55, 0x55, 0x55, 0x55 };
56 u8 values[I2C_SMBUS_BLOCK_MAX] = {0};
57 int len, error;
58
59
60 len = i2c_smbus_read_block_data(client,
61 ETP_SMBUS_HELLOPACKET_CMD, values);
62 if (len != ETP_SMBUS_HELLOPACKET_LEN) {
63 dev_err(&client->dev, "hello packet length fail: %d\n", len);
64 error = len < 0 ? len : -EIO;
65 return error;
66 }
67
68
69 if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
70 dev_err(&client->dev, "hello packet fail [%*ph]\n",
71 ETP_SMBUS_HELLOPACKET_LEN, values);
72 return -ENXIO;
73 }
74
75
76 error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
77 if (error) {
78 dev_err(&client->dev, "failed to enable touchpad: %d\n", error);
79 return error;
80 }
81
82 return 0;
83}
84
85static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
86{
87 u8 cmd[4] = { 0x00, 0x07, 0x00, mode };
88
89 return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
90 sizeof(cmd), cmd);
91}
92
93static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
94{
95 if (sleep)
96 return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD);
97 else
98 return 0;
99}
100
101static int elan_smbus_power_control(struct i2c_client *client, bool enable)
102{
103 return 0;
104}
105
106static int elan_smbus_calibrate(struct i2c_client *client)
107{
108 u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 };
109
110 return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
111 sizeof(cmd), cmd);
112}
113
114static int elan_smbus_calibrate_result(struct i2c_client *client, u8 *val)
115{
116 int error;
117 u8 buf[I2C_SMBUS_BLOCK_MAX] = {0};
118
119 BUILD_BUG_ON(ETP_CALIBRATE_MAX_LEN > sizeof(buf));
120
121 error = i2c_smbus_read_block_data(client,
122 ETP_SMBUS_CALIBRATE_QUERY, buf);
123 if (error < 0)
124 return error;
125
126 memcpy(val, buf, ETP_CALIBRATE_MAX_LEN);
127 return 0;
128}
129
130static int elan_smbus_get_baseline_data(struct i2c_client *client,
131 bool max_baseline, u8 *value)
132{
133 int error;
134 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
135
136 error = i2c_smbus_read_block_data(client,
137 max_baseline ?
138 ETP_SMBUS_MAX_BASELINE_CMD :
139 ETP_SMBUS_MIN_BASELINE_CMD,
140 val);
141 if (error < 0)
142 return error;
143
144 *value = be16_to_cpup((__be16 *)val);
145
146 return 0;
147}
148
149static int elan_smbus_get_version(struct i2c_client *client,
150 bool iap, u8 *version)
151{
152 int error;
153 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
154
155 error = i2c_smbus_read_block_data(client,
156 iap ? ETP_SMBUS_IAP_VERSION_CMD :
157 ETP_SMBUS_FW_VERSION_CMD,
158 val);
159 if (error < 0) {
160 dev_err(&client->dev, "failed to get %s version: %d\n",
161 iap ? "IAP" : "FW", error);
162 return error;
163 }
164
165 *version = val[2];
166 return 0;
167}
168
169static int elan_smbus_get_sm_version(struct i2c_client *client,
170 u16 *ic_type, u8 *version,
171 u8 *clickpad)
172{
173 int error;
174 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
175
176 error = i2c_smbus_read_block_data(client,
177 ETP_SMBUS_SM_VERSION_CMD, val);
178 if (error < 0) {
179 dev_err(&client->dev, "failed to get SM version: %d\n", error);
180 return error;
181 }
182
183 *version = val[0];
184 *ic_type = val[1];
185 *clickpad = val[0] & 0x10;
186 return 0;
187}
188
189static int elan_smbus_get_product_id(struct i2c_client *client, u16 *id)
190{
191 int error;
192 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
193
194 error = i2c_smbus_read_block_data(client,
195 ETP_SMBUS_UNIQUEID_CMD, val);
196 if (error < 0) {
197 dev_err(&client->dev, "failed to get product ID: %d\n", error);
198 return error;
199 }
200
201 *id = be16_to_cpup((__be16 *)val);
202 return 0;
203}
204
205static int elan_smbus_get_checksum(struct i2c_client *client,
206 bool iap, u16 *csum)
207{
208 int error;
209 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
210
211 error = i2c_smbus_read_block_data(client,
212 iap ? ETP_SMBUS_FW_CHECKSUM_CMD :
213 ETP_SMBUS_IAP_CHECKSUM_CMD,
214 val);
215 if (error < 0) {
216 dev_err(&client->dev, "failed to get %s checksum: %d\n",
217 iap ? "IAP" : "FW", error);
218 return error;
219 }
220
221 *csum = be16_to_cpup((__be16 *)val);
222 return 0;
223}
224
225static int elan_smbus_get_max(struct i2c_client *client,
226 unsigned int *max_x, unsigned int *max_y)
227{
228 int ret;
229 int error;
230 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
231
232 ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
233 if (ret != 3) {
234 error = ret < 0 ? ret : -EIO;
235 dev_err(&client->dev, "failed to get dimensions: %d\n", error);
236 return error;
237 }
238
239 *max_x = (0x0f & val[0]) << 8 | val[1];
240 *max_y = (0xf0 & val[0]) << 4 | val[2];
241
242 return 0;
243}
244
245static int elan_smbus_get_resolution(struct i2c_client *client,
246 u8 *hw_res_x, u8 *hw_res_y)
247{
248 int ret;
249 int error;
250 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
251
252 ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RESOLUTION_CMD, val);
253 if (ret != 3) {
254 error = ret < 0 ? ret : -EIO;
255 dev_err(&client->dev, "failed to get resolution: %d\n", error);
256 return error;
257 }
258
259 *hw_res_x = val[1] & 0x0F;
260 *hw_res_y = (val[1] & 0xF0) >> 4;
261
262 return 0;
263}
264
265static int elan_smbus_get_num_traces(struct i2c_client *client,
266 unsigned int *x_traces,
267 unsigned int *y_traces)
268{
269 int ret;
270 int error;
271 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
272
273 ret = i2c_smbus_read_block_data(client, ETP_SMBUS_XY_TRACENUM_CMD, val);
274 if (ret != 3) {
275 error = ret < 0 ? ret : -EIO;
276 dev_err(&client->dev, "failed to get trace info: %d\n", error);
277 return error;
278 }
279
280 *x_traces = val[1];
281 *y_traces = val[2];
282
283 return 0;
284}
285
286static int elan_smbus_get_pressure_adjustment(struct i2c_client *client,
287 int *adjustment)
288{
289 *adjustment = ETP_PRESSURE_OFFSET;
290 return 0;
291}
292
293static int elan_smbus_iap_get_mode(struct i2c_client *client,
294 enum tp_mode *mode)
295{
296 int error;
297 u16 constant;
298 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
299
300 error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val);
301 if (error < 0) {
302 dev_err(&client->dev, "failed to read iap ctrol register: %d\n",
303 error);
304 return error;
305 }
306
307 constant = be16_to_cpup((__be16 *)val);
308 dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
309
310 *mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE;
311
312 return 0;
313}
314
315static int elan_smbus_iap_reset(struct i2c_client *client)
316{
317 int error;
318
319 error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD);
320 if (error) {
321 dev_err(&client->dev, "cannot reset IC: %d\n", error);
322 return error;
323 }
324
325 return 0;
326}
327
328static int elan_smbus_set_flash_key(struct i2c_client *client)
329{
330 int error;
331 u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A };
332
333 error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
334 sizeof(cmd), cmd);
335 if (error) {
336 dev_err(&client->dev, "cannot set flash key: %d\n", error);
337 return error;
338 }
339
340 return 0;
341}
342
343static int elan_smbus_prepare_fw_update(struct i2c_client *client)
344{
345 struct device *dev = &client->dev;
346 int len;
347 int error;
348 enum tp_mode mode;
349 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
350 u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
351 u16 password;
352
353
354 error = elan_smbus_iap_get_mode(client, &mode);
355 if (error)
356 return error;
357
358 if (mode == MAIN_MODE) {
359
360
361 error = elan_smbus_set_flash_key(client);
362 if (error)
363 return error;
364
365
366 if (i2c_smbus_write_byte(client,
367 ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
368 dev_err(dev, "cannot write iap password\n");
369 return -EIO;
370 }
371
372 error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
373 sizeof(cmd), cmd);
374 if (error) {
375 dev_err(dev, "failed to write iap password: %d\n",
376 error);
377 return error;
378 }
379
380
381
382
383
384 len = i2c_smbus_read_block_data(client,
385 ETP_SMBUS_IAP_PASSWORD_READ,
386 val);
387 if (len < (int)sizeof(u16)) {
388 error = len < 0 ? len : -EIO;
389 dev_err(dev, "failed to read iap password: %d\n",
390 error);
391 return error;
392 }
393
394 password = be16_to_cpup((__be16 *)val);
395 if (password != ETP_SMBUS_IAP_PASSWORD) {
396 dev_err(dev, "wrong iap password = 0x%X\n", password);
397 return -EIO;
398 }
399
400
401 msleep(30);
402 }
403
404 error = elan_smbus_set_flash_key(client);
405 if (error)
406 return error;
407
408
409 error = elan_smbus_iap_reset(client);
410 if (error)
411 return error;
412
413 return 0;
414}
415
416
417static int elan_smbus_write_fw_block(struct i2c_client *client,
418 const u8 *page, u16 checksum, int idx)
419{
420 struct device *dev = &client->dev;
421 int error;
422 u16 result;
423 u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
424
425
426
427
428
429
430 error = i2c_smbus_write_block_data(client,
431 ETP_SMBUS_WRITE_FW_BLOCK,
432 ETP_FW_PAGE_SIZE / 2,
433 page);
434 if (error) {
435 dev_err(dev, "Failed to write page %d (part %d): %d\n",
436 idx, 1, error);
437 return error;
438 }
439
440 error = i2c_smbus_write_block_data(client,
441 ETP_SMBUS_WRITE_FW_BLOCK,
442 ETP_FW_PAGE_SIZE / 2,
443 page + ETP_FW_PAGE_SIZE / 2);
444 if (error) {
445 dev_err(dev, "Failed to write page %d (part %d): %d\n",
446 idx, 2, error);
447 return error;
448 }
449
450
451
452 usleep_range(8000, 10000);
453
454 error = i2c_smbus_read_block_data(client,
455 ETP_SMBUS_IAP_CTRL_CMD, val);
456 if (error < 0) {
457 dev_err(dev, "Failed to read IAP write result: %d\n",
458 error);
459 return error;
460 }
461
462 result = be16_to_cpup((__be16 *)val);
463 if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
464 dev_err(dev, "IAP reports failed write: %04hx\n",
465 result);
466 return -EIO;
467 }
468
469 return 0;
470}
471
472static int elan_smbus_get_report(struct i2c_client *client, u8 *report)
473{
474 int len;
475
476 BUILD_BUG_ON(I2C_SMBUS_BLOCK_MAX > ETP_SMBUS_REPORT_LEN);
477
478 len = i2c_smbus_read_block_data(client,
479 ETP_SMBUS_PACKET_QUERY,
480 &report[ETP_SMBUS_REPORT_OFFSET]);
481 if (len < 0) {
482 dev_err(&client->dev, "failed to read report data: %d\n", len);
483 return len;
484 }
485
486 if (len != ETP_SMBUS_REPORT_LEN) {
487 dev_err(&client->dev,
488 "wrong report length (%d vs %d expected)\n",
489 len, ETP_SMBUS_REPORT_LEN);
490 return -EIO;
491 }
492
493 return 0;
494}
495
496static int elan_smbus_finish_fw_update(struct i2c_client *client,
497 struct completion *fw_completion)
498{
499
500 return 0;
501}
502
503static int elan_smbus_get_pattern(struct i2c_client *client, u8 *pattern)
504{
505 *pattern = 0;
506 return 0;
507}
508
509const struct elan_transport_ops elan_smbus_ops = {
510 .initialize = elan_smbus_initialize,
511 .sleep_control = elan_smbus_sleep_control,
512 .power_control = elan_smbus_power_control,
513 .set_mode = elan_smbus_set_mode,
514
515 .calibrate = elan_smbus_calibrate,
516 .calibrate_result = elan_smbus_calibrate_result,
517
518 .get_baseline_data = elan_smbus_get_baseline_data,
519
520 .get_version = elan_smbus_get_version,
521 .get_sm_version = elan_smbus_get_sm_version,
522 .get_product_id = elan_smbus_get_product_id,
523 .get_checksum = elan_smbus_get_checksum,
524 .get_pressure_adjustment = elan_smbus_get_pressure_adjustment,
525
526 .get_max = elan_smbus_get_max,
527 .get_resolution = elan_smbus_get_resolution,
528 .get_num_traces = elan_smbus_get_num_traces,
529
530 .iap_get_mode = elan_smbus_iap_get_mode,
531 .iap_reset = elan_smbus_iap_reset,
532
533 .prepare_fw_update = elan_smbus_prepare_fw_update,
534 .write_fw_block = elan_smbus_write_fw_block,
535 .finish_fw_update = elan_smbus_finish_fw_update,
536
537 .get_report = elan_smbus_get_report,
538 .get_pattern = elan_smbus_get_pattern,
539};
540
