Commit | Line | Data |
---|---|---|
66aee900 SL |
1 | /* |
2 | * Elan Microelectronics touch panels with I2C interface | |
3 | * | |
4 | * Copyright (C) 2014 Elan Microelectronics Corporation. | |
5 | * Scott Liu <scott.liu@emc.com.tw> | |
6 | * | |
7 | * This code is partly based on hid-multitouch.c: | |
8 | * | |
9 | * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr> | |
10 | * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> | |
11 | * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France | |
12 | * | |
13 | * | |
14 | * This code is partly based on i2c-hid.c: | |
15 | * | |
16 | * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> | |
17 | * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France | |
18 | * Copyright (c) 2012 Red Hat, Inc | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This software is licensed under the terms of the GNU General Public | |
23 | * License version 2, as published by the Free Software Foundation, and | |
24 | * may be copied, distributed, and modified under those terms. | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/input.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/async.h> | |
32 | #include <linux/i2c.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/uaccess.h> | |
35 | #include <linux/buffer_head.h> | |
66aee900 SL |
36 | #include <linux/slab.h> |
37 | #include <linux/firmware.h> | |
66aee900 SL |
38 | #include <linux/input/mt.h> |
39 | #include <linux/acpi.h> | |
40 | #include <linux/of.h> | |
afe10358 DT |
41 | #include <linux/gpio/consumer.h> |
42 | #include <linux/regulator/consumer.h> | |
66aee900 SL |
43 | #include <asm/unaligned.h> |
44 | ||
45 | /* Device, Driver information */ | |
46 | #define DEVICE_NAME "elants_i2c" | |
47 | #define DRV_VERSION "1.0.9" | |
48 | ||
49 | /* Convert from rows or columns into resolution */ | |
50 | #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) | |
51 | ||
52 | /* FW header data */ | |
53 | #define HEADER_SIZE 4 | |
54 | #define FW_HDR_TYPE 0 | |
55 | #define FW_HDR_COUNT 1 | |
56 | #define FW_HDR_LENGTH 2 | |
57 | ||
58 | /* Buffer mode Queue Header information */ | |
59 | #define QUEUE_HEADER_SINGLE 0x62 | |
60 | #define QUEUE_HEADER_NORMAL 0X63 | |
61 | #define QUEUE_HEADER_WAIT 0x64 | |
62 | ||
63 | /* Command header definition */ | |
64 | #define CMD_HEADER_WRITE 0x54 | |
65 | #define CMD_HEADER_READ 0x53 | |
66 | #define CMD_HEADER_6B_READ 0x5B | |
67 | #define CMD_HEADER_RESP 0x52 | |
68 | #define CMD_HEADER_6B_RESP 0x9B | |
69 | #define CMD_HEADER_HELLO 0x55 | |
70 | #define CMD_HEADER_REK 0x66 | |
71 | ||
72 | /* FW position data */ | |
73 | #define PACKET_SIZE 55 | |
74 | #define MAX_CONTACT_NUM 10 | |
75 | #define FW_POS_HEADER 0 | |
76 | #define FW_POS_STATE 1 | |
77 | #define FW_POS_TOTAL 2 | |
78 | #define FW_POS_XY 3 | |
79 | #define FW_POS_CHECKSUM 34 | |
80 | #define FW_POS_WIDTH 35 | |
81 | #define FW_POS_PRESSURE 45 | |
82 | ||
83 | #define HEADER_REPORT_10_FINGER 0x62 | |
84 | ||
85 | /* Header (4 bytes) plus 3 fill 10-finger packets */ | |
86 | #define MAX_PACKET_SIZE 169 | |
87 | ||
88 | #define BOOT_TIME_DELAY_MS 50 | |
89 | ||
90 | /* FW read command, 0x53 0x?? 0x0, 0x01 */ | |
91 | #define E_ELAN_INFO_FW_VER 0x00 | |
92 | #define E_ELAN_INFO_BC_VER 0x10 | |
93 | #define E_ELAN_INFO_TEST_VER 0xE0 | |
94 | #define E_ELAN_INFO_FW_ID 0xF0 | |
95 | #define E_INFO_OSR 0xD6 | |
96 | #define E_INFO_PHY_SCAN 0xD7 | |
97 | #define E_INFO_PHY_DRIVER 0xD8 | |
98 | ||
99 | #define MAX_RETRIES 3 | |
100 | #define MAX_FW_UPDATE_RETRIES 30 | |
101 | ||
102 | #define ELAN_FW_PAGESIZE 132 | |
66aee900 SL |
103 | |
104 | /* calibration timeout definition */ | |
22c15e5e | 105 | #define ELAN_CALI_TIMEOUT_MSEC 12000 |
66aee900 | 106 | |
afe10358 DT |
107 | #define ELAN_POWERON_DELAY_USEC 500 |
108 | #define ELAN_RESET_DELAY_MSEC 20 | |
109 | ||
66aee900 SL |
110 | enum elants_state { |
111 | ELAN_STATE_NORMAL, | |
112 | ELAN_WAIT_QUEUE_HEADER, | |
113 | ELAN_WAIT_RECALIBRATION, | |
114 | }; | |
115 | ||
116 | enum elants_iap_mode { | |
117 | ELAN_IAP_OPERATIONAL, | |
118 | ELAN_IAP_RECOVERY, | |
119 | }; | |
120 | ||
121 | /* struct elants_data - represents state of Elan touchscreen device */ | |
122 | struct elants_data { | |
123 | struct i2c_client *client; | |
124 | struct input_dev *input; | |
125 | ||
afe10358 DT |
126 | struct regulator *vcc33; |
127 | struct regulator *vccio; | |
128 | struct gpio_desc *reset_gpio; | |
129 | ||
66aee900 SL |
130 | u16 fw_version; |
131 | u8 test_version; | |
132 | u8 solution_version; | |
133 | u8 bc_version; | |
134 | u8 iap_version; | |
135 | u16 hw_version; | |
136 | unsigned int x_res; /* resolution in units/mm */ | |
137 | unsigned int y_res; | |
138 | unsigned int x_max; | |
139 | unsigned int y_max; | |
140 | ||
141 | enum elants_state state; | |
142 | enum elants_iap_mode iap_mode; | |
143 | ||
144 | /* Guards against concurrent access to the device via sysfs */ | |
145 | struct mutex sysfs_mutex; | |
146 | ||
147 | u8 cmd_resp[HEADER_SIZE]; | |
148 | struct completion cmd_done; | |
149 | ||
150 | u8 buf[MAX_PACKET_SIZE]; | |
151 | ||
152 | bool wake_irq_enabled; | |
afe10358 | 153 | bool keep_power_in_suspend; |
66aee900 SL |
154 | }; |
155 | ||
156 | static int elants_i2c_send(struct i2c_client *client, | |
157 | const void *data, size_t size) | |
158 | { | |
159 | int ret; | |
160 | ||
161 | ret = i2c_master_send(client, data, size); | |
162 | if (ret == size) | |
163 | return 0; | |
164 | ||
165 | if (ret >= 0) | |
166 | ret = -EIO; | |
167 | ||
168 | dev_err(&client->dev, "%s failed (%*ph): %d\n", | |
169 | __func__, (int)size, data, ret); | |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
174 | static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) | |
175 | { | |
176 | int ret; | |
177 | ||
178 | ret = i2c_master_recv(client, data, size); | |
179 | if (ret == size) | |
180 | return 0; | |
181 | ||
182 | if (ret >= 0) | |
183 | ret = -EIO; | |
184 | ||
185 | dev_err(&client->dev, "%s failed: %d\n", __func__, ret); | |
186 | ||
187 | return ret; | |
188 | } | |
189 | ||
190 | static int elants_i2c_execute_command(struct i2c_client *client, | |
191 | const u8 *cmd, size_t cmd_size, | |
192 | u8 *resp, size_t resp_size) | |
193 | { | |
194 | struct i2c_msg msgs[2]; | |
195 | int ret; | |
196 | u8 expected_response; | |
197 | ||
198 | switch (cmd[0]) { | |
199 | case CMD_HEADER_READ: | |
200 | expected_response = CMD_HEADER_RESP; | |
201 | break; | |
202 | ||
203 | case CMD_HEADER_6B_READ: | |
204 | expected_response = CMD_HEADER_6B_RESP; | |
205 | break; | |
206 | ||
207 | default: | |
208 | dev_err(&client->dev, "%s: invalid command %*ph\n", | |
209 | __func__, (int)cmd_size, cmd); | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | msgs[0].addr = client->addr; | |
214 | msgs[0].flags = client->flags & I2C_M_TEN; | |
215 | msgs[0].len = cmd_size; | |
216 | msgs[0].buf = (u8 *)cmd; | |
217 | ||
218 | msgs[1].addr = client->addr; | |
219 | msgs[1].flags = client->flags & I2C_M_TEN; | |
220 | msgs[1].flags |= I2C_M_RD; | |
221 | msgs[1].len = resp_size; | |
222 | msgs[1].buf = resp; | |
223 | ||
224 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
225 | if (ret < 0) | |
226 | return ret; | |
227 | ||
228 | if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response) | |
229 | return -EIO; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static int elants_i2c_calibrate(struct elants_data *ts) | |
235 | { | |
236 | struct i2c_client *client = ts->client; | |
237 | int ret, error; | |
238 | static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A }; | |
239 | static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 }; | |
240 | static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; | |
241 | ||
242 | disable_irq(client->irq); | |
243 | ||
244 | ts->state = ELAN_WAIT_RECALIBRATION; | |
245 | reinit_completion(&ts->cmd_done); | |
246 | ||
247 | elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); | |
248 | elants_i2c_send(client, rek, sizeof(rek)); | |
249 | ||
250 | enable_irq(client->irq); | |
251 | ||
252 | ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, | |
253 | msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); | |
254 | ||
255 | ts->state = ELAN_STATE_NORMAL; | |
256 | ||
257 | if (ret <= 0) { | |
258 | error = ret < 0 ? ret : -ETIMEDOUT; | |
259 | dev_err(&client->dev, | |
260 | "error while waiting for calibration to complete: %d\n", | |
261 | error); | |
262 | return error; | |
263 | } | |
264 | ||
265 | if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { | |
266 | dev_err(&client->dev, | |
267 | "unexpected calibration response: %*ph\n", | |
268 | (int)sizeof(ts->cmd_resp), ts->cmd_resp); | |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static int elants_i2c_sw_reset(struct i2c_client *client) | |
276 | { | |
277 | const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; | |
278 | int error; | |
279 | ||
280 | error = elants_i2c_send(client, soft_rst_cmd, | |
281 | sizeof(soft_rst_cmd)); | |
282 | if (error) { | |
283 | dev_err(&client->dev, "software reset failed: %d\n", error); | |
284 | return error; | |
285 | } | |
286 | ||
287 | /* | |
288 | * We should wait at least 10 msec (but no more than 40) before | |
289 | * sending fastboot or IAP command to the device. | |
290 | */ | |
291 | msleep(30); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static u16 elants_i2c_parse_version(u8 *buf) | |
297 | { | |
298 | return get_unaligned_be32(buf) >> 4; | |
299 | } | |
300 | ||
bc1d57fe | 301 | static int elants_i2c_query_hw_version(struct elants_data *ts) |
66aee900 SL |
302 | { |
303 | struct i2c_client *client = ts->client; | |
304 | int error, retry_cnt; | |
305 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; | |
306 | u8 resp[HEADER_SIZE]; | |
307 | ||
308 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
309 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
310 | resp, sizeof(resp)); | |
311 | if (!error) { | |
312 | ts->hw_version = elants_i2c_parse_version(resp); | |
313 | if (ts->hw_version != 0xffff) | |
314 | return 0; | |
315 | } | |
316 | ||
317 | dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n", | |
318 | error, (int)sizeof(resp), resp); | |
319 | } | |
320 | ||
bc1d57fe JC |
321 | if (error) { |
322 | dev_err(&client->dev, | |
323 | "Failed to read fw id: %d\n", error); | |
324 | return error; | |
325 | } | |
326 | ||
327 | dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); | |
66aee900 SL |
328 | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | static int elants_i2c_query_fw_version(struct elants_data *ts) | |
333 | { | |
334 | struct i2c_client *client = ts->client; | |
335 | int error, retry_cnt; | |
336 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; | |
337 | u8 resp[HEADER_SIZE]; | |
338 | ||
339 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
340 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
341 | resp, sizeof(resp)); | |
342 | if (!error) { | |
343 | ts->fw_version = elants_i2c_parse_version(resp); | |
344 | if (ts->fw_version != 0x0000 && | |
345 | ts->fw_version != 0xffff) | |
346 | return 0; | |
347 | } | |
348 | ||
349 | dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n", | |
350 | error, (int)sizeof(resp), resp); | |
351 | } | |
352 | ||
353 | dev_err(&client->dev, | |
354 | "Failed to read fw version or fw version is invalid\n"); | |
355 | ||
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | static int elants_i2c_query_test_version(struct elants_data *ts) | |
360 | { | |
361 | struct i2c_client *client = ts->client; | |
362 | int error, retry_cnt; | |
363 | u16 version; | |
364 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; | |
365 | u8 resp[HEADER_SIZE]; | |
366 | ||
367 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
368 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
369 | resp, sizeof(resp)); | |
370 | if (!error) { | |
371 | version = elants_i2c_parse_version(resp); | |
372 | ts->test_version = version >> 8; | |
373 | ts->solution_version = version & 0xff; | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | dev_dbg(&client->dev, | |
379 | "read test version error rc=%d, buf=%*phC\n", | |
380 | error, (int)sizeof(resp), resp); | |
381 | } | |
382 | ||
383 | dev_err(&client->dev, "Failed to read test version\n"); | |
384 | ||
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | static int elants_i2c_query_bc_version(struct elants_data *ts) | |
389 | { | |
390 | struct i2c_client *client = ts->client; | |
391 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; | |
392 | u8 resp[HEADER_SIZE]; | |
393 | u16 version; | |
394 | int error; | |
395 | ||
396 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
397 | resp, sizeof(resp)); | |
398 | if (error) { | |
399 | dev_err(&client->dev, | |
400 | "read BC version error=%d, buf=%*phC\n", | |
401 | error, (int)sizeof(resp), resp); | |
402 | return error; | |
403 | } | |
404 | ||
405 | version = elants_i2c_parse_version(resp); | |
406 | ts->bc_version = version >> 8; | |
407 | ts->iap_version = version & 0xff; | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int elants_i2c_query_ts_info(struct elants_data *ts) | |
413 | { | |
414 | struct i2c_client *client = ts->client; | |
415 | int error; | |
416 | u8 resp[17]; | |
417 | u16 phy_x, phy_y, rows, cols, osr; | |
418 | const u8 get_resolution_cmd[] = { | |
419 | CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 | |
420 | }; | |
421 | const u8 get_osr_cmd[] = { | |
422 | CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 | |
423 | }; | |
424 | const u8 get_physical_scan_cmd[] = { | |
425 | CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 | |
426 | }; | |
427 | const u8 get_physical_drive_cmd[] = { | |
428 | CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 | |
429 | }; | |
430 | ||
431 | /* Get trace number */ | |
432 | error = elants_i2c_execute_command(client, | |
433 | get_resolution_cmd, | |
434 | sizeof(get_resolution_cmd), | |
435 | resp, sizeof(resp)); | |
436 | if (error) { | |
437 | dev_err(&client->dev, "get resolution command failed: %d\n", | |
438 | error); | |
439 | return error; | |
440 | } | |
441 | ||
442 | rows = resp[2] + resp[6] + resp[10]; | |
443 | cols = resp[3] + resp[7] + resp[11]; | |
444 | ||
445 | /* Process mm_to_pixel information */ | |
446 | error = elants_i2c_execute_command(client, | |
447 | get_osr_cmd, sizeof(get_osr_cmd), | |
448 | resp, sizeof(resp)); | |
449 | if (error) { | |
450 | dev_err(&client->dev, "get osr command failed: %d\n", | |
451 | error); | |
452 | return error; | |
453 | } | |
454 | ||
455 | osr = resp[3]; | |
456 | ||
457 | error = elants_i2c_execute_command(client, | |
458 | get_physical_scan_cmd, | |
459 | sizeof(get_physical_scan_cmd), | |
460 | resp, sizeof(resp)); | |
461 | if (error) { | |
462 | dev_err(&client->dev, "get physical scan command failed: %d\n", | |
463 | error); | |
464 | return error; | |
465 | } | |
466 | ||
467 | phy_x = get_unaligned_be16(&resp[2]); | |
468 | ||
469 | error = elants_i2c_execute_command(client, | |
470 | get_physical_drive_cmd, | |
471 | sizeof(get_physical_drive_cmd), | |
472 | resp, sizeof(resp)); | |
473 | if (error) { | |
474 | dev_err(&client->dev, "get physical drive command failed: %d\n", | |
475 | error); | |
476 | return error; | |
477 | } | |
478 | ||
479 | phy_y = get_unaligned_be16(&resp[2]); | |
480 | ||
481 | dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); | |
482 | ||
483 | if (rows == 0 || cols == 0 || osr == 0) { | |
484 | dev_warn(&client->dev, | |
485 | "invalid trace number data: %d, %d, %d\n", | |
486 | rows, cols, osr); | |
487 | } else { | |
488 | /* translate trace number to TS resolution */ | |
489 | ts->x_max = ELAN_TS_RESOLUTION(rows, osr); | |
490 | ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); | |
491 | ts->y_max = ELAN_TS_RESOLUTION(cols, osr); | |
492 | ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); | |
493 | } | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int elants_i2c_fastboot(struct i2c_client *client) | |
499 | { | |
500 | const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; | |
501 | int error; | |
502 | ||
503 | error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); | |
504 | if (error) { | |
505 | dev_err(&client->dev, "boot failed: %d\n", error); | |
506 | return error; | |
507 | } | |
508 | ||
509 | dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static int elants_i2c_initialize(struct elants_data *ts) | |
514 | { | |
515 | struct i2c_client *client = ts->client; | |
bc1d57fe | 516 | int error, error2, retry_cnt; |
66aee900 SL |
517 | const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; |
518 | const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; | |
519 | u8 buf[HEADER_SIZE]; | |
520 | ||
521 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
522 | error = elants_i2c_sw_reset(client); | |
523 | if (error) { | |
524 | /* Continue initializing if it's the last try */ | |
525 | if (retry_cnt < MAX_RETRIES - 1) | |
526 | continue; | |
527 | } | |
528 | ||
529 | error = elants_i2c_fastboot(client); | |
530 | if (error) { | |
531 | /* Continue initializing if it's the last try */ | |
532 | if (retry_cnt < MAX_RETRIES - 1) | |
533 | continue; | |
534 | } | |
535 | ||
536 | /* Wait for Hello packet */ | |
537 | msleep(BOOT_TIME_DELAY_MS); | |
538 | ||
539 | error = elants_i2c_read(client, buf, sizeof(buf)); | |
540 | if (error) { | |
541 | dev_err(&client->dev, | |
542 | "failed to read 'hello' packet: %d\n", error); | |
543 | } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { | |
544 | ts->iap_mode = ELAN_IAP_OPERATIONAL; | |
545 | break; | |
546 | } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { | |
547 | /* | |
548 | * Setting error code will mark device | |
549 | * in recovery mode below. | |
550 | */ | |
551 | error = -EIO; | |
552 | break; | |
553 | } else { | |
554 | error = -EINVAL; | |
555 | dev_err(&client->dev, | |
556 | "invalid 'hello' packet: %*ph\n", | |
557 | (int)sizeof(buf), buf); | |
558 | } | |
559 | } | |
560 | ||
bc1d57fe JC |
561 | /* hw version is available even if device in recovery state */ |
562 | error2 = elants_i2c_query_hw_version(ts); | |
66aee900 | 563 | if (!error) |
bc1d57fe JC |
564 | error = error2; |
565 | ||
66aee900 SL |
566 | if (!error) |
567 | error = elants_i2c_query_fw_version(ts); | |
bc1d57fe JC |
568 | if (!error) |
569 | error = elants_i2c_query_test_version(ts); | |
570 | if (!error) | |
571 | error = elants_i2c_query_bc_version(ts); | |
572 | if (!error) | |
573 | error = elants_i2c_query_ts_info(ts); | |
66aee900 | 574 | |
bc1d57fe | 575 | if (error) |
66aee900 | 576 | ts->iap_mode = ELAN_IAP_RECOVERY; |
66aee900 SL |
577 | |
578 | return 0; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Firmware update interface. | |
583 | */ | |
584 | ||
585 | static int elants_i2c_fw_write_page(struct i2c_client *client, | |
586 | const void *page) | |
587 | { | |
588 | const u8 ack_ok[] = { 0xaa, 0xaa }; | |
589 | u8 buf[2]; | |
590 | int retry; | |
591 | int error; | |
592 | ||
593 | for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { | |
594 | error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); | |
595 | if (error) { | |
596 | dev_err(&client->dev, | |
597 | "IAP Write Page failed: %d\n", error); | |
598 | continue; | |
599 | } | |
600 | ||
601 | error = elants_i2c_read(client, buf, 2); | |
602 | if (error) { | |
603 | dev_err(&client->dev, | |
604 | "IAP Ack read failed: %d\n", error); | |
605 | return error; | |
606 | } | |
607 | ||
608 | if (!memcmp(buf, ack_ok, sizeof(ack_ok))) | |
609 | return 0; | |
610 | ||
611 | error = -EIO; | |
612 | dev_err(&client->dev, | |
613 | "IAP Get Ack Error [%02x:%02x]\n", | |
614 | buf[0], buf[1]); | |
615 | } | |
616 | ||
617 | return error; | |
618 | } | |
619 | ||
620 | static int elants_i2c_do_update_firmware(struct i2c_client *client, | |
621 | const struct firmware *fw, | |
622 | bool force) | |
623 | { | |
624 | const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; | |
625 | const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; | |
626 | const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; | |
6fd38502 | 627 | const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01}; |
66aee900 SL |
628 | u8 buf[HEADER_SIZE]; |
629 | u16 send_id; | |
630 | int page, n_fw_pages; | |
631 | int error; | |
632 | ||
633 | /* Recovery mode detection! */ | |
634 | if (force) { | |
635 | dev_dbg(&client->dev, "Recovery mode procedure\n"); | |
636 | error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); | |
637 | } else { | |
638 | /* Start IAP Procedure */ | |
639 | dev_dbg(&client->dev, "Normal IAP procedure\n"); | |
6fd38502 JC |
640 | /* Close idle mode */ |
641 | error = elants_i2c_send(client, close_idle, sizeof(close_idle)); | |
642 | if (error) | |
643 | dev_err(&client->dev, "Failed close idle: %d\n", error); | |
644 | msleep(60); | |
66aee900 | 645 | elants_i2c_sw_reset(client); |
6fd38502 | 646 | msleep(20); |
66aee900 SL |
647 | error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); |
648 | } | |
649 | ||
650 | if (error) { | |
651 | dev_err(&client->dev, "failed to enter IAP mode: %d\n", error); | |
652 | return error; | |
653 | } | |
654 | ||
655 | msleep(20); | |
656 | ||
657 | /* check IAP state */ | |
658 | error = elants_i2c_read(client, buf, 4); | |
659 | if (error) { | |
660 | dev_err(&client->dev, | |
661 | "failed to read IAP acknowledgement: %d\n", | |
662 | error); | |
663 | return error; | |
664 | } | |
665 | ||
666 | if (memcmp(buf, iap_ack, sizeof(iap_ack))) { | |
667 | dev_err(&client->dev, | |
668 | "failed to enter IAP: %*ph (expected %*ph)\n", | |
669 | (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); | |
670 | return -EIO; | |
671 | } | |
672 | ||
673 | dev_info(&client->dev, "successfully entered IAP mode"); | |
674 | ||
675 | send_id = client->addr; | |
676 | error = elants_i2c_send(client, &send_id, 1); | |
677 | if (error) { | |
678 | dev_err(&client->dev, "sending dummy byte failed: %d\n", | |
679 | error); | |
680 | return error; | |
681 | } | |
682 | ||
683 | /* Clear the last page of Master */ | |
684 | error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); | |
685 | if (error) { | |
686 | dev_err(&client->dev, "clearing of the last page failed: %d\n", | |
687 | error); | |
688 | return error; | |
689 | } | |
690 | ||
691 | error = elants_i2c_read(client, buf, 2); | |
692 | if (error) { | |
693 | dev_err(&client->dev, | |
694 | "failed to read ACK for clearing the last page: %d\n", | |
695 | error); | |
696 | return error; | |
697 | } | |
698 | ||
699 | n_fw_pages = fw->size / ELAN_FW_PAGESIZE; | |
700 | dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); | |
701 | ||
702 | for (page = 0; page < n_fw_pages; page++) { | |
703 | error = elants_i2c_fw_write_page(client, | |
704 | fw->data + page * ELAN_FW_PAGESIZE); | |
705 | if (error) { | |
706 | dev_err(&client->dev, | |
707 | "failed to write FW page %d: %d\n", | |
708 | page, error); | |
709 | return error; | |
710 | } | |
711 | } | |
712 | ||
713 | /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ | |
714 | msleep(300); | |
715 | ||
716 | dev_info(&client->dev, "firmware update completed\n"); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static int elants_i2c_fw_update(struct elants_data *ts) | |
721 | { | |
722 | struct i2c_client *client = ts->client; | |
723 | const struct firmware *fw; | |
37dee1ac | 724 | char *fw_name; |
66aee900 SL |
725 | int error; |
726 | ||
8c0776a8 | 727 | fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); |
37dee1ac CM |
728 | if (!fw_name) |
729 | return -ENOMEM; | |
730 | ||
731 | dev_info(&client->dev, "requesting fw name = %s\n", fw_name); | |
732 | error = request_firmware(&fw, fw_name, &client->dev); | |
733 | kfree(fw_name); | |
66aee900 | 734 | if (error) { |
37dee1ac CM |
735 | dev_err(&client->dev, "failed to request firmware: %d\n", |
736 | error); | |
66aee900 SL |
737 | return error; |
738 | } | |
739 | ||
740 | if (fw->size % ELAN_FW_PAGESIZE) { | |
741 | dev_err(&client->dev, "invalid firmware length: %zu\n", | |
742 | fw->size); | |
743 | error = -EINVAL; | |
744 | goto out; | |
745 | } | |
746 | ||
747 | disable_irq(client->irq); | |
748 | ||
749 | error = elants_i2c_do_update_firmware(client, fw, | |
750 | ts->iap_mode == ELAN_IAP_RECOVERY); | |
751 | if (error) { | |
752 | dev_err(&client->dev, "firmware update failed: %d\n", error); | |
753 | ts->iap_mode = ELAN_IAP_RECOVERY; | |
754 | goto out_enable_irq; | |
755 | } | |
756 | ||
757 | error = elants_i2c_initialize(ts); | |
758 | if (error) { | |
759 | dev_err(&client->dev, | |
760 | "failed to initialize device after firmware update: %d\n", | |
761 | error); | |
762 | ts->iap_mode = ELAN_IAP_RECOVERY; | |
763 | goto out_enable_irq; | |
764 | } | |
765 | ||
766 | ts->iap_mode = ELAN_IAP_OPERATIONAL; | |
767 | ||
768 | out_enable_irq: | |
769 | ts->state = ELAN_STATE_NORMAL; | |
770 | enable_irq(client->irq); | |
771 | msleep(100); | |
772 | ||
773 | if (!error) | |
774 | elants_i2c_calibrate(ts); | |
775 | out: | |
776 | release_firmware(fw); | |
777 | return error; | |
778 | } | |
779 | ||
780 | /* | |
781 | * Event reporting. | |
782 | */ | |
783 | ||
784 | static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) | |
785 | { | |
786 | struct input_dev *input = ts->input; | |
787 | unsigned int n_fingers; | |
788 | u16 finger_state; | |
789 | int i; | |
790 | ||
791 | n_fingers = buf[FW_POS_STATE + 1] & 0x0f; | |
792 | finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | | |
793 | buf[FW_POS_STATE]; | |
794 | ||
795 | dev_dbg(&ts->client->dev, | |
796 | "n_fingers: %u, state: %04x\n", n_fingers, finger_state); | |
797 | ||
798 | for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { | |
799 | if (finger_state & 1) { | |
800 | unsigned int x, y, p, w; | |
801 | u8 *pos; | |
802 | ||
803 | pos = &buf[FW_POS_XY + i * 3]; | |
804 | x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; | |
805 | y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; | |
806 | p = buf[FW_POS_PRESSURE + i]; | |
807 | w = buf[FW_POS_WIDTH + i]; | |
808 | ||
809 | dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", | |
810 | i, x, y, p, w); | |
811 | ||
812 | input_mt_slot(input, i); | |
813 | input_mt_report_slot_state(input, MT_TOOL_FINGER, true); | |
814 | input_event(input, EV_ABS, ABS_MT_POSITION_X, x); | |
815 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, y); | |
816 | input_event(input, EV_ABS, ABS_MT_PRESSURE, p); | |
817 | input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); | |
818 | ||
819 | n_fingers--; | |
820 | } | |
821 | ||
822 | finger_state >>= 1; | |
823 | } | |
824 | ||
825 | input_mt_sync_frame(input); | |
826 | input_sync(input); | |
827 | } | |
828 | ||
829 | static u8 elants_i2c_calculate_checksum(u8 *buf) | |
830 | { | |
831 | u8 checksum = 0; | |
832 | u8 i; | |
833 | ||
834 | for (i = 0; i < FW_POS_CHECKSUM; i++) | |
835 | checksum += buf[i]; | |
836 | ||
837 | return checksum; | |
838 | } | |
839 | ||
840 | static void elants_i2c_event(struct elants_data *ts, u8 *buf) | |
841 | { | |
842 | u8 checksum = elants_i2c_calculate_checksum(buf); | |
843 | ||
844 | if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) | |
845 | dev_warn(&ts->client->dev, | |
846 | "%s: invalid checksum for packet %02x: %02x vs. %02x\n", | |
847 | __func__, buf[FW_POS_HEADER], | |
848 | checksum, buf[FW_POS_CHECKSUM]); | |
849 | else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) | |
850 | dev_warn(&ts->client->dev, | |
851 | "%s: unknown packet type: %02x\n", | |
852 | __func__, buf[FW_POS_HEADER]); | |
853 | else | |
854 | elants_i2c_mt_event(ts, buf); | |
855 | } | |
856 | ||
857 | static irqreturn_t elants_i2c_irq(int irq, void *_dev) | |
858 | { | |
859 | const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; | |
860 | struct elants_data *ts = _dev; | |
861 | struct i2c_client *client = ts->client; | |
862 | int report_count, report_len; | |
863 | int i; | |
864 | int len; | |
865 | ||
866 | len = i2c_master_recv(client, ts->buf, sizeof(ts->buf)); | |
867 | if (len < 0) { | |
868 | dev_err(&client->dev, "%s: failed to read data: %d\n", | |
869 | __func__, len); | |
870 | goto out; | |
871 | } | |
872 | ||
873 | dev_dbg(&client->dev, "%s: packet %*ph\n", | |
874 | __func__, HEADER_SIZE, ts->buf); | |
875 | ||
876 | switch (ts->state) { | |
877 | case ELAN_WAIT_RECALIBRATION: | |
878 | if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { | |
879 | memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); | |
880 | complete(&ts->cmd_done); | |
881 | ts->state = ELAN_STATE_NORMAL; | |
882 | } | |
883 | break; | |
884 | ||
885 | case ELAN_WAIT_QUEUE_HEADER: | |
886 | if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) | |
887 | break; | |
888 | ||
889 | ts->state = ELAN_STATE_NORMAL; | |
890 | /* fall through */ | |
891 | ||
892 | case ELAN_STATE_NORMAL: | |
893 | ||
894 | switch (ts->buf[FW_HDR_TYPE]) { | |
895 | case CMD_HEADER_HELLO: | |
896 | case CMD_HEADER_RESP: | |
897 | case CMD_HEADER_REK: | |
898 | break; | |
899 | ||
900 | case QUEUE_HEADER_WAIT: | |
901 | if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { | |
902 | dev_err(&client->dev, | |
903 | "invalid wait packet %*ph\n", | |
904 | HEADER_SIZE, ts->buf); | |
905 | } else { | |
906 | ts->state = ELAN_WAIT_QUEUE_HEADER; | |
907 | udelay(30); | |
908 | } | |
909 | break; | |
910 | ||
911 | case QUEUE_HEADER_SINGLE: | |
912 | elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); | |
913 | break; | |
914 | ||
915 | case QUEUE_HEADER_NORMAL: | |
916 | report_count = ts->buf[FW_HDR_COUNT]; | |
1c3415a0 | 917 | if (report_count == 0 || report_count > 3) { |
66aee900 | 918 | dev_err(&client->dev, |
1c3415a0 | 919 | "bad report count: %*ph\n", |
66aee900 SL |
920 | HEADER_SIZE, ts->buf); |
921 | break; | |
922 | } | |
923 | ||
924 | report_len = ts->buf[FW_HDR_LENGTH] / report_count; | |
925 | if (report_len != PACKET_SIZE) { | |
926 | dev_err(&client->dev, | |
927 | "mismatching report length: %*ph\n", | |
928 | HEADER_SIZE, ts->buf); | |
929 | break; | |
930 | } | |
931 | ||
932 | for (i = 0; i < report_count; i++) { | |
933 | u8 *buf = ts->buf + HEADER_SIZE + | |
934 | i * PACKET_SIZE; | |
935 | elants_i2c_event(ts, buf); | |
936 | } | |
937 | break; | |
938 | ||
939 | default: | |
940 | dev_err(&client->dev, "unknown packet %*ph\n", | |
941 | HEADER_SIZE, ts->buf); | |
942 | break; | |
943 | } | |
944 | break; | |
945 | } | |
946 | ||
947 | out: | |
948 | return IRQ_HANDLED; | |
949 | } | |
950 | ||
951 | /* | |
952 | * sysfs interface | |
953 | */ | |
954 | static ssize_t calibrate_store(struct device *dev, | |
955 | struct device_attribute *attr, | |
956 | const char *buf, size_t count) | |
957 | { | |
958 | struct i2c_client *client = to_i2c_client(dev); | |
959 | struct elants_data *ts = i2c_get_clientdata(client); | |
960 | int error; | |
961 | ||
962 | error = mutex_lock_interruptible(&ts->sysfs_mutex); | |
963 | if (error) | |
964 | return error; | |
965 | ||
966 | error = elants_i2c_calibrate(ts); | |
967 | ||
968 | mutex_unlock(&ts->sysfs_mutex); | |
969 | return error ?: count; | |
970 | } | |
971 | ||
972 | static ssize_t write_update_fw(struct device *dev, | |
973 | struct device_attribute *attr, | |
974 | const char *buf, size_t count) | |
975 | { | |
976 | struct i2c_client *client = to_i2c_client(dev); | |
977 | struct elants_data *ts = i2c_get_clientdata(client); | |
978 | int error; | |
979 | ||
980 | error = mutex_lock_interruptible(&ts->sysfs_mutex); | |
981 | if (error) | |
982 | return error; | |
983 | ||
984 | error = elants_i2c_fw_update(ts); | |
985 | dev_dbg(dev, "firmware update result: %d\n", error); | |
986 | ||
987 | mutex_unlock(&ts->sysfs_mutex); | |
988 | return error ?: count; | |
989 | } | |
990 | ||
991 | static ssize_t show_iap_mode(struct device *dev, | |
992 | struct device_attribute *attr, char *buf) | |
993 | { | |
994 | struct i2c_client *client = to_i2c_client(dev); | |
995 | struct elants_data *ts = i2c_get_clientdata(client); | |
996 | ||
997 | return sprintf(buf, "%s\n", | |
998 | ts->iap_mode == ELAN_IAP_OPERATIONAL ? | |
999 | "Normal" : "Recovery"); | |
1000 | } | |
1001 | ||
1002 | static DEVICE_ATTR(calibrate, S_IWUSR, NULL, calibrate_store); | |
1003 | static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); | |
1004 | static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); | |
1005 | ||
1006 | struct elants_version_attribute { | |
1007 | struct device_attribute dattr; | |
1008 | size_t field_offset; | |
1009 | size_t field_size; | |
1010 | }; | |
1011 | ||
1012 | #define __ELANTS_FIELD_SIZE(_field) \ | |
1013 | sizeof(((struct elants_data *)NULL)->_field) | |
1014 | #define __ELANTS_VERIFY_SIZE(_field) \ | |
1015 | (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ | |
1016 | __ELANTS_FIELD_SIZE(_field)) | |
1017 | #define ELANTS_VERSION_ATTR(_field) \ | |
1018 | struct elants_version_attribute elants_ver_attr_##_field = { \ | |
1019 | .dattr = __ATTR(_field, S_IRUGO, \ | |
1020 | elants_version_attribute_show, NULL), \ | |
1021 | .field_offset = offsetof(struct elants_data, _field), \ | |
1022 | .field_size = __ELANTS_VERIFY_SIZE(_field), \ | |
1023 | } | |
1024 | ||
1025 | static ssize_t elants_version_attribute_show(struct device *dev, | |
1026 | struct device_attribute *dattr, | |
1027 | char *buf) | |
1028 | { | |
1029 | struct i2c_client *client = to_i2c_client(dev); | |
1030 | struct elants_data *ts = i2c_get_clientdata(client); | |
1031 | struct elants_version_attribute *attr = | |
1032 | container_of(dattr, struct elants_version_attribute, dattr); | |
1033 | u8 *field = (u8 *)((char *)ts + attr->field_offset); | |
1034 | unsigned int fmt_size; | |
1035 | unsigned int val; | |
1036 | ||
1037 | if (attr->field_size == 1) { | |
1038 | val = *field; | |
1039 | fmt_size = 2; /* 2 HEX digits */ | |
1040 | } else { | |
1041 | val = *(u16 *)field; | |
1042 | fmt_size = 4; /* 4 HEX digits */ | |
1043 | } | |
1044 | ||
1045 | return sprintf(buf, "%0*x\n", fmt_size, val); | |
1046 | } | |
1047 | ||
1048 | static ELANTS_VERSION_ATTR(fw_version); | |
1049 | static ELANTS_VERSION_ATTR(hw_version); | |
1050 | static ELANTS_VERSION_ATTR(test_version); | |
1051 | static ELANTS_VERSION_ATTR(solution_version); | |
1052 | static ELANTS_VERSION_ATTR(bc_version); | |
1053 | static ELANTS_VERSION_ATTR(iap_version); | |
1054 | ||
1055 | static struct attribute *elants_attributes[] = { | |
1056 | &dev_attr_calibrate.attr, | |
1057 | &dev_attr_update_fw.attr, | |
1058 | &dev_attr_iap_mode.attr, | |
1059 | ||
1060 | &elants_ver_attr_fw_version.dattr.attr, | |
1061 | &elants_ver_attr_hw_version.dattr.attr, | |
1062 | &elants_ver_attr_test_version.dattr.attr, | |
1063 | &elants_ver_attr_solution_version.dattr.attr, | |
1064 | &elants_ver_attr_bc_version.dattr.attr, | |
1065 | &elants_ver_attr_iap_version.dattr.attr, | |
1066 | NULL | |
1067 | }; | |
1068 | ||
48f960dd | 1069 | static const struct attribute_group elants_attribute_group = { |
66aee900 SL |
1070 | .attrs = elants_attributes, |
1071 | }; | |
1072 | ||
1073 | static void elants_i2c_remove_sysfs_group(void *_data) | |
1074 | { | |
1075 | struct elants_data *ts = _data; | |
1076 | ||
1077 | sysfs_remove_group(&ts->client->dev.kobj, &elants_attribute_group); | |
1078 | } | |
1079 | ||
afe10358 DT |
1080 | static int elants_i2c_power_on(struct elants_data *ts) |
1081 | { | |
1082 | int error; | |
1083 | ||
1084 | /* | |
1085 | * If we do not have reset gpio assume platform firmware | |
1086 | * controls regulators and does power them on for us. | |
1087 | */ | |
1088 | if (IS_ERR_OR_NULL(ts->reset_gpio)) | |
1089 | return 0; | |
1090 | ||
1091 | gpiod_set_value_cansleep(ts->reset_gpio, 1); | |
1092 | ||
1093 | error = regulator_enable(ts->vcc33); | |
1094 | if (error) { | |
1095 | dev_err(&ts->client->dev, | |
1096 | "failed to enable vcc33 regulator: %d\n", | |
1097 | error); | |
1098 | goto release_reset_gpio; | |
1099 | } | |
1100 | ||
1101 | error = regulator_enable(ts->vccio); | |
1102 | if (error) { | |
1103 | dev_err(&ts->client->dev, | |
1104 | "failed to enable vccio regulator: %d\n", | |
1105 | error); | |
1106 | regulator_disable(ts->vcc33); | |
1107 | goto release_reset_gpio; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * We need to wait a bit after powering on controller before | |
1112 | * we are allowed to release reset GPIO. | |
1113 | */ | |
1114 | udelay(ELAN_POWERON_DELAY_USEC); | |
1115 | ||
1116 | release_reset_gpio: | |
1117 | gpiod_set_value_cansleep(ts->reset_gpio, 0); | |
1118 | if (error) | |
1119 | return error; | |
1120 | ||
1121 | msleep(ELAN_RESET_DELAY_MSEC); | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static void elants_i2c_power_off(void *_data) | |
1127 | { | |
1128 | struct elants_data *ts = _data; | |
1129 | ||
1130 | if (!IS_ERR_OR_NULL(ts->reset_gpio)) { | |
1131 | /* | |
1132 | * Activate reset gpio to prevent leakage through the | |
1133 | * pin once we shut off power to the controller. | |
1134 | */ | |
1135 | gpiod_set_value_cansleep(ts->reset_gpio, 1); | |
1136 | regulator_disable(ts->vccio); | |
1137 | regulator_disable(ts->vcc33); | |
1138 | } | |
1139 | } | |
1140 | ||
66aee900 SL |
1141 | static int elants_i2c_probe(struct i2c_client *client, |
1142 | const struct i2c_device_id *id) | |
1143 | { | |
1144 | union i2c_smbus_data dummy; | |
1145 | struct elants_data *ts; | |
1146 | unsigned long irqflags; | |
1147 | int error; | |
1148 | ||
1149 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
1150 | dev_err(&client->dev, | |
1151 | "%s: i2c check functionality error\n", DEVICE_NAME); | |
1152 | return -ENXIO; | |
1153 | } | |
1154 | ||
66aee900 SL |
1155 | ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); |
1156 | if (!ts) | |
1157 | return -ENOMEM; | |
1158 | ||
1159 | mutex_init(&ts->sysfs_mutex); | |
1160 | init_completion(&ts->cmd_done); | |
1161 | ||
1162 | ts->client = client; | |
1163 | i2c_set_clientdata(client, ts); | |
1164 | ||
afe10358 DT |
1165 | ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); |
1166 | if (IS_ERR(ts->vcc33)) { | |
1167 | error = PTR_ERR(ts->vcc33); | |
1168 | if (error != -EPROBE_DEFER) | |
1169 | dev_err(&client->dev, | |
1170 | "Failed to get 'vcc33' regulator: %d\n", | |
1171 | error); | |
1172 | return error; | |
1173 | } | |
1174 | ||
1175 | ts->vccio = devm_regulator_get(&client->dev, "vccio"); | |
1176 | if (IS_ERR(ts->vccio)) { | |
1177 | error = PTR_ERR(ts->vccio); | |
1178 | if (error != -EPROBE_DEFER) | |
1179 | dev_err(&client->dev, | |
1180 | "Failed to get 'vccio' regulator: %d\n", | |
1181 | error); | |
1182 | return error; | |
1183 | } | |
1184 | ||
7229b87b | 1185 | ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); |
afe10358 DT |
1186 | if (IS_ERR(ts->reset_gpio)) { |
1187 | error = PTR_ERR(ts->reset_gpio); | |
1188 | ||
1189 | if (error == -EPROBE_DEFER) | |
1190 | return error; | |
1191 | ||
1192 | if (error != -ENOENT && error != -ENOSYS) { | |
1193 | dev_err(&client->dev, | |
1194 | "failed to get reset gpio: %d\n", | |
1195 | error); | |
1196 | return error; | |
1197 | } | |
1198 | ||
1199 | ts->keep_power_in_suspend = true; | |
afe10358 DT |
1200 | } |
1201 | ||
1202 | error = elants_i2c_power_on(ts); | |
1203 | if (error) | |
1204 | return error; | |
1205 | ||
1206 | error = devm_add_action(&client->dev, elants_i2c_power_off, ts); | |
1207 | if (error) { | |
1208 | dev_err(&client->dev, | |
1209 | "failed to install power off action: %d\n", error); | |
1210 | elants_i2c_power_off(ts); | |
1211 | return error; | |
1212 | } | |
1213 | ||
1214 | /* Make sure there is something at this address */ | |
1215 | if (i2c_smbus_xfer(client->adapter, client->addr, 0, | |
1216 | I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { | |
1217 | dev_err(&client->dev, "nothing at this address\n"); | |
1218 | return -ENXIO; | |
1219 | } | |
1220 | ||
66aee900 SL |
1221 | error = elants_i2c_initialize(ts); |
1222 | if (error) { | |
1223 | dev_err(&client->dev, "failed to initialize: %d\n", error); | |
1224 | return error; | |
1225 | } | |
1226 | ||
1227 | ts->input = devm_input_allocate_device(&client->dev); | |
1228 | if (!ts->input) { | |
1229 | dev_err(&client->dev, "Failed to allocate input device\n"); | |
1230 | return -ENOMEM; | |
1231 | } | |
1232 | ||
1233 | ts->input->name = "Elan Touchscreen"; | |
1234 | ts->input->id.bustype = BUS_I2C; | |
1235 | ||
1236 | __set_bit(BTN_TOUCH, ts->input->keybit); | |
1237 | __set_bit(EV_ABS, ts->input->evbit); | |
1238 | __set_bit(EV_KEY, ts->input->evbit); | |
1239 | ||
1240 | /* Single touch input params setup */ | |
1241 | input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0); | |
1242 | input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0); | |
1243 | input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0); | |
1244 | input_abs_set_res(ts->input, ABS_X, ts->x_res); | |
1245 | input_abs_set_res(ts->input, ABS_Y, ts->y_res); | |
1246 | ||
1247 | /* Multitouch input params setup */ | |
1248 | error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, | |
1249 | INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); | |
1250 | if (error) { | |
1251 | dev_err(&client->dev, | |
1252 | "failed to initialize MT slots: %d\n", error); | |
1253 | return error; | |
1254 | } | |
1255 | ||
1256 | input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); | |
1257 | input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); | |
1258 | input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); | |
1259 | input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); | |
1260 | input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); | |
1261 | input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); | |
1262 | ||
66aee900 SL |
1263 | error = input_register_device(ts->input); |
1264 | if (error) { | |
1265 | dev_err(&client->dev, | |
1266 | "unable to register input device: %d\n", error); | |
1267 | return error; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Systems using device tree should set up interrupt via DTS, | |
1272 | * the rest will use the default falling edge interrupts. | |
1273 | */ | |
1274 | irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING; | |
1275 | ||
1276 | error = devm_request_threaded_irq(&client->dev, client->irq, | |
1277 | NULL, elants_i2c_irq, | |
1278 | irqflags | IRQF_ONESHOT, | |
1279 | client->name, ts); | |
1280 | if (error) { | |
1281 | dev_err(&client->dev, "Failed to register interrupt\n"); | |
1282 | return error; | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * Systems using device tree should set up wakeup via DTS, | |
1287 | * the rest will configure device as wakeup source by default. | |
1288 | */ | |
1289 | if (!client->dev.of_node) | |
1290 | device_init_wakeup(&client->dev, true); | |
1291 | ||
1292 | error = sysfs_create_group(&client->dev.kobj, &elants_attribute_group); | |
1293 | if (error) { | |
1294 | dev_err(&client->dev, "failed to create sysfs attributes: %d\n", | |
1295 | error); | |
1296 | return error; | |
1297 | } | |
1298 | ||
1299 | error = devm_add_action(&client->dev, | |
1300 | elants_i2c_remove_sysfs_group, ts); | |
1301 | if (error) { | |
1302 | elants_i2c_remove_sysfs_group(ts); | |
1303 | dev_err(&client->dev, | |
1304 | "Failed to add sysfs cleanup action: %d\n", | |
1305 | error); | |
1306 | return error; | |
1307 | } | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | static int __maybe_unused elants_i2c_suspend(struct device *dev) | |
1313 | { | |
1314 | struct i2c_client *client = to_i2c_client(dev); | |
1315 | struct elants_data *ts = i2c_get_clientdata(client); | |
1316 | const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 }; | |
1317 | int retry_cnt; | |
1318 | int error; | |
1319 | ||
1320 | /* Command not support in IAP recovery mode */ | |
1321 | if (ts->iap_mode != ELAN_IAP_OPERATIONAL) | |
1322 | return -EBUSY; | |
1323 | ||
1324 | disable_irq(client->irq); | |
1325 | ||
478e5ed1 JC |
1326 | if (device_may_wakeup(dev)) { |
1327 | /* | |
1328 | * The device will automatically enter idle mode | |
1329 | * that has reduced power consumption. | |
1330 | */ | |
1331 | ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); | |
1332 | } else if (ts->keep_power_in_suspend) { | |
afe10358 DT |
1333 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
1334 | error = elants_i2c_send(client, set_sleep_cmd, | |
1335 | sizeof(set_sleep_cmd)); | |
1336 | if (!error) | |
1337 | break; | |
66aee900 | 1338 | |
afe10358 DT |
1339 | dev_err(&client->dev, |
1340 | "suspend command failed: %d\n", error); | |
1341 | } | |
afe10358 DT |
1342 | } else { |
1343 | elants_i2c_power_off(ts); | |
1344 | } | |
66aee900 SL |
1345 | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | static int __maybe_unused elants_i2c_resume(struct device *dev) | |
1350 | { | |
1351 | struct i2c_client *client = to_i2c_client(dev); | |
1352 | struct elants_data *ts = i2c_get_clientdata(client); | |
1353 | const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 }; | |
1354 | int retry_cnt; | |
1355 | int error; | |
1356 | ||
478e5ed1 JC |
1357 | if (device_may_wakeup(dev)) { |
1358 | if (ts->wake_irq_enabled) | |
1359 | disable_irq_wake(client->irq); | |
1360 | elants_i2c_sw_reset(client); | |
1361 | } else if (ts->keep_power_in_suspend) { | |
afe10358 DT |
1362 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
1363 | error = elants_i2c_send(client, set_active_cmd, | |
1364 | sizeof(set_active_cmd)); | |
1365 | if (!error) | |
1366 | break; | |
66aee900 | 1367 | |
afe10358 DT |
1368 | dev_err(&client->dev, |
1369 | "resume command failed: %d\n", error); | |
1370 | } | |
1371 | } else { | |
1372 | elants_i2c_power_on(ts); | |
1373 | elants_i2c_initialize(ts); | |
66aee900 SL |
1374 | } |
1375 | ||
1376 | ts->state = ELAN_STATE_NORMAL; | |
1377 | enable_irq(client->irq); | |
1378 | ||
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, | |
1383 | elants_i2c_suspend, elants_i2c_resume); | |
1384 | ||
1385 | static const struct i2c_device_id elants_i2c_id[] = { | |
1386 | { DEVICE_NAME, 0 }, | |
1387 | { } | |
1388 | }; | |
1389 | MODULE_DEVICE_TABLE(i2c, elants_i2c_id); | |
1390 | ||
1391 | #ifdef CONFIG_ACPI | |
1392 | static const struct acpi_device_id elants_acpi_id[] = { | |
1393 | { "ELAN0001", 0 }, | |
1394 | { } | |
1395 | }; | |
1396 | MODULE_DEVICE_TABLE(acpi, elants_acpi_id); | |
1397 | #endif | |
1398 | ||
1399 | #ifdef CONFIG_OF | |
1400 | static const struct of_device_id elants_of_match[] = { | |
1401 | { .compatible = "elan,ekth3500" }, | |
1402 | { /* sentinel */ } | |
1403 | }; | |
1404 | MODULE_DEVICE_TABLE(of, elants_of_match); | |
1405 | #endif | |
1406 | ||
1407 | static struct i2c_driver elants_i2c_driver = { | |
1408 | .probe = elants_i2c_probe, | |
1409 | .id_table = elants_i2c_id, | |
1410 | .driver = { | |
1411 | .name = DEVICE_NAME, | |
66aee900 SL |
1412 | .pm = &elants_i2c_pm_ops, |
1413 | .acpi_match_table = ACPI_PTR(elants_acpi_id), | |
1414 | .of_match_table = of_match_ptr(elants_of_match), | |
9f6a07b6 | 1415 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
66aee900 SL |
1416 | }, |
1417 | }; | |
1418 | module_i2c_driver(elants_i2c_driver); | |
1419 | ||
1420 | MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); | |
1421 | MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); | |
1422 | MODULE_VERSION(DRV_VERSION); | |
1423 | MODULE_LICENSE("GPL"); |