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6696777c DL |
1 | /* |
2 | * Elan I2C/SMBus Touchpad driver - SMBus interface | |
3 | * | |
4 | * Copyright (c) 2013 ELAN Microelectronics Corp. | |
5 | * | |
6 | * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw> | |
6696777c DL |
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/delay.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/kernel.h> | |
23 | ||
24 | #include "elan_i2c.h" | |
25 | ||
26 | /* Elan SMbus commands */ | |
27 | #define ETP_SMBUS_IAP_CMD 0x00 | |
28 | #define ETP_SMBUS_ENABLE_TP 0x20 | |
29 | #define ETP_SMBUS_SLEEP_CMD 0x21 | |
30 | #define ETP_SMBUS_IAP_PASSWORD_WRITE 0x29 | |
31 | #define ETP_SMBUS_IAP_PASSWORD_READ 0x80 | |
32 | #define ETP_SMBUS_WRITE_FW_BLOCK 0x2A | |
33 | #define ETP_SMBUS_IAP_RESET_CMD 0x2B | |
34 | #define ETP_SMBUS_RANGE_CMD 0xA0 | |
35 | #define ETP_SMBUS_FW_VERSION_CMD 0xA1 | |
36 | #define ETP_SMBUS_XY_TRACENUM_CMD 0xA2 | |
37 | #define ETP_SMBUS_SM_VERSION_CMD 0xA3 | |
38 | #define ETP_SMBUS_UNIQUEID_CMD 0xA3 | |
39 | #define ETP_SMBUS_RESOLUTION_CMD 0xA4 | |
40 | #define ETP_SMBUS_HELLOPACKET_CMD 0xA7 | |
41 | #define ETP_SMBUS_PACKET_QUERY 0xA8 | |
42 | #define ETP_SMBUS_IAP_VERSION_CMD 0xAC | |
43 | #define ETP_SMBUS_IAP_CTRL_CMD 0xAD | |
44 | #define ETP_SMBUS_IAP_CHECKSUM_CMD 0xAE | |
45 | #define ETP_SMBUS_FW_CHECKSUM_CMD 0xAF | |
46 | #define ETP_SMBUS_MAX_BASELINE_CMD 0xC3 | |
47 | #define ETP_SMBUS_MIN_BASELINE_CMD 0xC4 | |
48 | #define ETP_SMBUS_CALIBRATE_QUERY 0xC5 | |
49 | ||
50 | #define ETP_SMBUS_REPORT_LEN 32 | |
51 | #define ETP_SMBUS_REPORT_OFFSET 2 | |
52 | #define ETP_SMBUS_HELLOPACKET_LEN 5 | |
53 | #define ETP_SMBUS_IAP_PASSWORD 0x1234 | |
54 | #define ETP_SMBUS_IAP_MODE_ON (1 << 6) | |
55 | ||
56 | static int elan_smbus_initialize(struct i2c_client *client) | |
57 | { | |
58 | u8 check[ETP_SMBUS_HELLOPACKET_LEN] = { 0x55, 0x55, 0x55, 0x55, 0x55 }; | |
59 | u8 values[ETP_SMBUS_HELLOPACKET_LEN] = { 0, 0, 0, 0, 0 }; | |
60 | int len, error; | |
61 | ||
62 | /* Get hello packet */ | |
63 | len = i2c_smbus_read_block_data(client, | |
64 | ETP_SMBUS_HELLOPACKET_CMD, values); | |
65 | if (len != ETP_SMBUS_HELLOPACKET_LEN) { | |
66 | dev_err(&client->dev, "hello packet length fail: %d\n", len); | |
67 | error = len < 0 ? len : -EIO; | |
68 | return error; | |
69 | } | |
70 | ||
71 | /* compare hello packet */ | |
72 | if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) { | |
98a4a59e | 73 | dev_err(&client->dev, "hello packet fail [%*ph]\n", |
6696777c DL |
74 | ETP_SMBUS_HELLOPACKET_LEN, values); |
75 | return -ENXIO; | |
76 | } | |
77 | ||
78 | /* enable tp */ | |
79 | error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP); | |
80 | if (error) { | |
81 | dev_err(&client->dev, "failed to enable touchpad: %d\n", error); | |
82 | return error; | |
83 | } | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int elan_smbus_set_mode(struct i2c_client *client, u8 mode) | |
89 | { | |
90 | u8 cmd[4] = { 0x00, 0x07, 0x00, mode }; | |
91 | ||
92 | return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD, | |
93 | sizeof(cmd), cmd); | |
94 | } | |
95 | ||
96 | static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep) | |
97 | { | |
98 | if (sleep) | |
99 | return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD); | |
100 | else | |
101 | return 0; /* XXX should we send ETP_SMBUS_ENABLE_TP here? */ | |
102 | } | |
103 | ||
104 | static int elan_smbus_power_control(struct i2c_client *client, bool enable) | |
105 | { | |
106 | return 0; /* A no-op */ | |
107 | } | |
108 | ||
109 | static int elan_smbus_calibrate(struct i2c_client *client) | |
110 | { | |
111 | u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 }; | |
112 | ||
113 | return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD, | |
114 | sizeof(cmd), cmd); | |
115 | } | |
116 | ||
117 | static int elan_smbus_calibrate_result(struct i2c_client *client, u8 *val) | |
118 | { | |
119 | int error; | |
120 | ||
121 | error = i2c_smbus_read_block_data(client, | |
122 | ETP_SMBUS_CALIBRATE_QUERY, val); | |
123 | if (error < 0) | |
124 | return error; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static int elan_smbus_get_baseline_data(struct i2c_client *client, | |
130 | bool max_baseline, u8 *value) | |
131 | { | |
132 | int error; | |
133 | u8 val[3]; | |
134 | ||
135 | error = i2c_smbus_read_block_data(client, | |
136 | max_baseline ? | |
137 | ETP_SMBUS_MAX_BASELINE_CMD : | |
138 | ETP_SMBUS_MIN_BASELINE_CMD, | |
139 | val); | |
140 | if (error < 0) | |
141 | return error; | |
142 | ||
143 | *value = be16_to_cpup((__be16 *)val); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int elan_smbus_get_version(struct i2c_client *client, | |
149 | bool iap, u8 *version) | |
150 | { | |
151 | int error; | |
152 | u8 val[3]; | |
153 | ||
154 | error = i2c_smbus_read_block_data(client, | |
155 | iap ? ETP_SMBUS_IAP_VERSION_CMD : | |
156 | ETP_SMBUS_FW_VERSION_CMD, | |
157 | val); | |
158 | if (error < 0) { | |
159 | dev_err(&client->dev, "failed to get %s version: %d\n", | |
160 | iap ? "IAP" : "FW", error); | |
161 | return error; | |
162 | } | |
163 | ||
164 | *version = val[2]; | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static int elan_smbus_get_sm_version(struct i2c_client *client, u8 *version) | |
169 | { | |
170 | int error; | |
171 | u8 val[3]; | |
172 | ||
173 | error = i2c_smbus_read_block_data(client, | |
174 | ETP_SMBUS_SM_VERSION_CMD, val); | |
175 | if (error < 0) { | |
176 | dev_err(&client->dev, "failed to get SM version: %d\n", error); | |
177 | return error; | |
178 | } | |
179 | ||
180 | *version = val[0]; /* XXX Why 0 and not 2 as in IAP/FW versions? */ | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int elan_smbus_get_product_id(struct i2c_client *client, u8 *id) | |
185 | { | |
186 | int error; | |
187 | u8 val[3]; | |
188 | ||
189 | error = i2c_smbus_read_block_data(client, | |
190 | ETP_SMBUS_UNIQUEID_CMD, val); | |
191 | if (error < 0) { | |
192 | dev_err(&client->dev, "failed to get product ID: %d\n", error); | |
193 | return error; | |
194 | } | |
195 | ||
196 | *id = val[1]; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static int elan_smbus_get_checksum(struct i2c_client *client, | |
201 | bool iap, u16 *csum) | |
202 | { | |
203 | int error; | |
204 | u8 val[3]; | |
205 | ||
206 | error = i2c_smbus_read_block_data(client, | |
207 | iap ? ETP_SMBUS_FW_CHECKSUM_CMD : | |
208 | ETP_SMBUS_IAP_CHECKSUM_CMD, | |
209 | val); | |
210 | if (error < 0) { | |
211 | dev_err(&client->dev, "failed to get %s checksum: %d\n", | |
212 | iap ? "IAP" : "FW", error); | |
213 | return error; | |
214 | } | |
215 | ||
216 | *csum = be16_to_cpup((__be16 *)val); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int elan_smbus_get_max(struct i2c_client *client, | |
221 | unsigned int *max_x, unsigned int *max_y) | |
222 | { | |
223 | int error; | |
224 | u8 val[3]; | |
225 | ||
226 | error = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val); | |
227 | if (error) { | |
228 | dev_err(&client->dev, "failed to get dimensions: %d\n", error); | |
229 | return error; | |
230 | } | |
231 | ||
232 | *max_x = (0x0f & val[0]) << 8 | val[1]; | |
233 | *max_y = (0xf0 & val[0]) << 4 | val[2]; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int elan_smbus_get_resolution(struct i2c_client *client, | |
239 | u8 *hw_res_x, u8 *hw_res_y) | |
240 | { | |
241 | int error; | |
242 | u8 val[3]; | |
243 | ||
244 | error = i2c_smbus_read_block_data(client, | |
245 | ETP_SMBUS_RESOLUTION_CMD, val); | |
246 | if (error) { | |
247 | dev_err(&client->dev, "failed to get resolution: %d\n", error); | |
248 | return error; | |
249 | } | |
250 | ||
251 | *hw_res_x = val[1] & 0x0F; | |
252 | *hw_res_y = (val[1] & 0xF0) >> 4; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static int elan_smbus_get_num_traces(struct i2c_client *client, | |
258 | unsigned int *x_traces, | |
259 | unsigned int *y_traces) | |
260 | { | |
261 | int error; | |
262 | u8 val[3]; | |
263 | ||
264 | error = i2c_smbus_read_block_data(client, | |
265 | ETP_SMBUS_XY_TRACENUM_CMD, val); | |
266 | if (error) { | |
267 | dev_err(&client->dev, "failed to get trace info: %d\n", error); | |
268 | return error; | |
269 | } | |
270 | ||
271 | *x_traces = val[1] - 1; | |
272 | *y_traces = val[2] - 1; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
b9bced0e | 277 | static int elan_smbus_get_pressure_adjustment(struct i2c_client *client, |
278 | int *adjustment) | |
279 | { | |
280 | *adjustment = ETP_PRESSURE_OFFSET; | |
281 | return 0; | |
282 | } | |
283 | ||
6696777c DL |
284 | static int elan_smbus_iap_get_mode(struct i2c_client *client, |
285 | enum tp_mode *mode) | |
286 | { | |
287 | int error; | |
288 | u16 constant; | |
289 | u8 val[3]; | |
290 | ||
291 | error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val); | |
292 | if (error < 0) { | |
293 | dev_err(&client->dev, "failed to read iap ctrol register: %d\n", | |
294 | error); | |
295 | return error; | |
296 | } | |
297 | ||
298 | constant = be16_to_cpup((__be16 *)val); | |
299 | dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant); | |
300 | ||
301 | *mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int elan_smbus_iap_reset(struct i2c_client *client) | |
307 | { | |
308 | int error; | |
309 | ||
310 | error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD); | |
311 | if (error) { | |
312 | dev_err(&client->dev, "cannot reset IC: %d\n", error); | |
313 | return error; | |
314 | } | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int elan_smbus_set_flash_key(struct i2c_client *client) | |
320 | { | |
321 | int error; | |
322 | u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A }; | |
323 | ||
324 | error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD, | |
325 | sizeof(cmd), cmd); | |
326 | if (error) { | |
327 | dev_err(&client->dev, "cannot set flash key: %d\n", error); | |
328 | return error; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int elan_smbus_prepare_fw_update(struct i2c_client *client) | |
335 | { | |
336 | struct device *dev = &client->dev; | |
337 | int len; | |
338 | int error; | |
339 | enum tp_mode mode; | |
340 | u8 val[3]; | |
341 | u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06}; | |
342 | u16 password; | |
343 | ||
344 | /* Get FW in which mode (IAP_MODE/MAIN_MODE) */ | |
345 | error = elan_smbus_iap_get_mode(client, &mode); | |
346 | if (error) | |
347 | return error; | |
348 | ||
349 | if (mode == MAIN_MODE) { | |
350 | ||
351 | /* set flash key */ | |
352 | error = elan_smbus_set_flash_key(client); | |
353 | if (error) | |
354 | return error; | |
355 | ||
356 | /* write iap password */ | |
357 | if (i2c_smbus_write_byte(client, | |
358 | ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) { | |
359 | dev_err(dev, "cannot write iap password\n"); | |
360 | return -EIO; | |
361 | } | |
362 | ||
363 | error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD, | |
364 | sizeof(cmd), cmd); | |
365 | if (error) { | |
366 | dev_err(dev, "failed to write iap password: %d\n", | |
367 | error); | |
368 | return error; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Read back password to make sure we enabled flash | |
373 | * successfully. | |
374 | */ | |
375 | len = i2c_smbus_read_block_data(client, | |
376 | ETP_SMBUS_IAP_PASSWORD_READ, | |
377 | val); | |
378 | if (len < sizeof(u16)) { | |
379 | error = len < 0 ? len : -EIO; | |
380 | dev_err(dev, "failed to read iap password: %d\n", | |
381 | error); | |
382 | return error; | |
383 | } | |
384 | ||
385 | password = be16_to_cpup((__be16 *)val); | |
386 | if (password != ETP_SMBUS_IAP_PASSWORD) { | |
387 | dev_err(dev, "wrong iap password = 0x%X\n", password); | |
388 | return -EIO; | |
389 | } | |
390 | ||
391 | /* Wait 30ms for MAIN_MODE change to IAP_MODE */ | |
392 | msleep(30); | |
393 | } | |
394 | ||
395 | error = elan_smbus_set_flash_key(client); | |
396 | if (error) | |
397 | return error; | |
398 | ||
399 | /* Reset IC */ | |
400 | error = elan_smbus_iap_reset(client); | |
401 | if (error) | |
402 | return error; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | ||
408 | static int elan_smbus_write_fw_block(struct i2c_client *client, | |
409 | const u8 *page, u16 checksum, int idx) | |
410 | { | |
411 | struct device *dev = &client->dev; | |
412 | int error; | |
413 | u16 result; | |
414 | u8 val[3]; | |
415 | ||
416 | /* | |
417 | * Due to the limitation of smbus protocol limiting | |
418 | * transfer to 32 bytes at a time, we must split block | |
419 | * in 2 transfers. | |
420 | */ | |
421 | error = i2c_smbus_write_block_data(client, | |
422 | ETP_SMBUS_WRITE_FW_BLOCK, | |
423 | ETP_FW_PAGE_SIZE / 2, | |
424 | page); | |
425 | if (error) { | |
426 | dev_err(dev, "Failed to write page %d (part %d): %d\n", | |
427 | idx, 1, error); | |
428 | return error; | |
429 | } | |
430 | ||
431 | error = i2c_smbus_write_block_data(client, | |
432 | ETP_SMBUS_WRITE_FW_BLOCK, | |
433 | ETP_FW_PAGE_SIZE / 2, | |
434 | page + ETP_FW_PAGE_SIZE / 2); | |
435 | if (error) { | |
436 | dev_err(dev, "Failed to write page %d (part %d): %d\n", | |
437 | idx, 2, error); | |
438 | return error; | |
439 | } | |
440 | ||
441 | ||
442 | /* Wait for F/W to update one page ROM data. */ | |
443 | usleep_range(8000, 10000); | |
444 | ||
445 | error = i2c_smbus_read_block_data(client, | |
446 | ETP_SMBUS_IAP_CTRL_CMD, val); | |
447 | if (error < 0) { | |
448 | dev_err(dev, "Failed to read IAP write result: %d\n", | |
449 | error); | |
450 | return error; | |
451 | } | |
452 | ||
453 | result = be16_to_cpup((__be16 *)val); | |
454 | if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) { | |
455 | dev_err(dev, "IAP reports failed write: %04hx\n", | |
456 | result); | |
457 | return -EIO; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static int elan_smbus_get_report(struct i2c_client *client, u8 *report) | |
464 | { | |
465 | int len; | |
466 | ||
467 | len = i2c_smbus_read_block_data(client, | |
468 | ETP_SMBUS_PACKET_QUERY, | |
469 | &report[ETP_SMBUS_REPORT_OFFSET]); | |
470 | if (len < 0) { | |
471 | dev_err(&client->dev, "failed to read report data: %d\n", len); | |
472 | return len; | |
473 | } | |
474 | ||
475 | if (len != ETP_SMBUS_REPORT_LEN) { | |
476 | dev_err(&client->dev, | |
477 | "wrong report length (%d vs %d expected)\n", | |
478 | len, ETP_SMBUS_REPORT_LEN); | |
479 | return -EIO; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | static int elan_smbus_finish_fw_update(struct i2c_client *client, | |
486 | struct completion *fw_completion) | |
487 | { | |
488 | /* No special handling unlike I2C transport */ | |
489 | return 0; | |
490 | } | |
491 | ||
492 | const struct elan_transport_ops elan_smbus_ops = { | |
493 | .initialize = elan_smbus_initialize, | |
494 | .sleep_control = elan_smbus_sleep_control, | |
495 | .power_control = elan_smbus_power_control, | |
496 | .set_mode = elan_smbus_set_mode, | |
497 | ||
498 | .calibrate = elan_smbus_calibrate, | |
499 | .calibrate_result = elan_smbus_calibrate_result, | |
500 | ||
501 | .get_baseline_data = elan_smbus_get_baseline_data, | |
502 | ||
503 | .get_version = elan_smbus_get_version, | |
504 | .get_sm_version = elan_smbus_get_sm_version, | |
505 | .get_product_id = elan_smbus_get_product_id, | |
506 | .get_checksum = elan_smbus_get_checksum, | |
b9bced0e | 507 | .get_pressure_adjustment = elan_smbus_get_pressure_adjustment, |
6696777c DL |
508 | |
509 | .get_max = elan_smbus_get_max, | |
510 | .get_resolution = elan_smbus_get_resolution, | |
511 | .get_num_traces = elan_smbus_get_num_traces, | |
512 | ||
513 | .iap_get_mode = elan_smbus_iap_get_mode, | |
514 | .iap_reset = elan_smbus_iap_reset, | |
515 | ||
516 | .prepare_fw_update = elan_smbus_prepare_fw_update, | |
517 | .write_fw_block = elan_smbus_write_fw_block, | |
518 | .finish_fw_update = elan_smbus_finish_fw_update, | |
519 | ||
520 | .get_report = elan_smbus_get_report, | |
521 | }; |