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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> | |
4c83c071 | 30 | #include <linux/irq.h> |
66aee900 SL |
31 | #include <linux/platform_device.h> |
32 | #include <linux/async.h> | |
33 | #include <linux/i2c.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/uaccess.h> | |
36 | #include <linux/buffer_head.h> | |
66aee900 SL |
37 | #include <linux/slab.h> |
38 | #include <linux/firmware.h> | |
66aee900 SL |
39 | #include <linux/input/mt.h> |
40 | #include <linux/acpi.h> | |
41 | #include <linux/of.h> | |
afe10358 DT |
42 | #include <linux/gpio/consumer.h> |
43 | #include <linux/regulator/consumer.h> | |
66aee900 SL |
44 | #include <asm/unaligned.h> |
45 | ||
46 | /* Device, Driver information */ | |
47 | #define DEVICE_NAME "elants_i2c" | |
48 | #define DRV_VERSION "1.0.9" | |
49 | ||
50 | /* Convert from rows or columns into resolution */ | |
51 | #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) | |
52 | ||
53 | /* FW header data */ | |
54 | #define HEADER_SIZE 4 | |
55 | #define FW_HDR_TYPE 0 | |
56 | #define FW_HDR_COUNT 1 | |
57 | #define FW_HDR_LENGTH 2 | |
58 | ||
59 | /* Buffer mode Queue Header information */ | |
60 | #define QUEUE_HEADER_SINGLE 0x62 | |
61 | #define QUEUE_HEADER_NORMAL 0X63 | |
62 | #define QUEUE_HEADER_WAIT 0x64 | |
63 | ||
64 | /* Command header definition */ | |
65 | #define CMD_HEADER_WRITE 0x54 | |
66 | #define CMD_HEADER_READ 0x53 | |
67 | #define CMD_HEADER_6B_READ 0x5B | |
68 | #define CMD_HEADER_RESP 0x52 | |
69 | #define CMD_HEADER_6B_RESP 0x9B | |
70 | #define CMD_HEADER_HELLO 0x55 | |
71 | #define CMD_HEADER_REK 0x66 | |
72 | ||
73 | /* FW position data */ | |
74 | #define PACKET_SIZE 55 | |
75 | #define MAX_CONTACT_NUM 10 | |
76 | #define FW_POS_HEADER 0 | |
77 | #define FW_POS_STATE 1 | |
78 | #define FW_POS_TOTAL 2 | |
79 | #define FW_POS_XY 3 | |
80 | #define FW_POS_CHECKSUM 34 | |
81 | #define FW_POS_WIDTH 35 | |
82 | #define FW_POS_PRESSURE 45 | |
83 | ||
84 | #define HEADER_REPORT_10_FINGER 0x62 | |
85 | ||
86 | /* Header (4 bytes) plus 3 fill 10-finger packets */ | |
87 | #define MAX_PACKET_SIZE 169 | |
88 | ||
89 | #define BOOT_TIME_DELAY_MS 50 | |
90 | ||
91 | /* FW read command, 0x53 0x?? 0x0, 0x01 */ | |
92 | #define E_ELAN_INFO_FW_VER 0x00 | |
93 | #define E_ELAN_INFO_BC_VER 0x10 | |
94 | #define E_ELAN_INFO_TEST_VER 0xE0 | |
95 | #define E_ELAN_INFO_FW_ID 0xF0 | |
96 | #define E_INFO_OSR 0xD6 | |
97 | #define E_INFO_PHY_SCAN 0xD7 | |
98 | #define E_INFO_PHY_DRIVER 0xD8 | |
99 | ||
100 | #define MAX_RETRIES 3 | |
101 | #define MAX_FW_UPDATE_RETRIES 30 | |
102 | ||
103 | #define ELAN_FW_PAGESIZE 132 | |
66aee900 SL |
104 | |
105 | /* calibration timeout definition */ | |
22c15e5e | 106 | #define ELAN_CALI_TIMEOUT_MSEC 12000 |
66aee900 | 107 | |
afe10358 DT |
108 | #define ELAN_POWERON_DELAY_USEC 500 |
109 | #define ELAN_RESET_DELAY_MSEC 20 | |
110 | ||
66aee900 SL |
111 | enum elants_state { |
112 | ELAN_STATE_NORMAL, | |
113 | ELAN_WAIT_QUEUE_HEADER, | |
114 | ELAN_WAIT_RECALIBRATION, | |
115 | }; | |
116 | ||
117 | enum elants_iap_mode { | |
118 | ELAN_IAP_OPERATIONAL, | |
119 | ELAN_IAP_RECOVERY, | |
120 | }; | |
121 | ||
122 | /* struct elants_data - represents state of Elan touchscreen device */ | |
123 | struct elants_data { | |
124 | struct i2c_client *client; | |
125 | struct input_dev *input; | |
126 | ||
afe10358 DT |
127 | struct regulator *vcc33; |
128 | struct regulator *vccio; | |
129 | struct gpio_desc *reset_gpio; | |
130 | ||
66aee900 SL |
131 | u16 fw_version; |
132 | u8 test_version; | |
133 | u8 solution_version; | |
134 | u8 bc_version; | |
135 | u8 iap_version; | |
136 | u16 hw_version; | |
137 | unsigned int x_res; /* resolution in units/mm */ | |
138 | unsigned int y_res; | |
139 | unsigned int x_max; | |
140 | unsigned int y_max; | |
141 | ||
142 | enum elants_state state; | |
143 | enum elants_iap_mode iap_mode; | |
144 | ||
145 | /* Guards against concurrent access to the device via sysfs */ | |
146 | struct mutex sysfs_mutex; | |
147 | ||
148 | u8 cmd_resp[HEADER_SIZE]; | |
149 | struct completion cmd_done; | |
150 | ||
151 | u8 buf[MAX_PACKET_SIZE]; | |
152 | ||
153 | bool wake_irq_enabled; | |
afe10358 | 154 | bool keep_power_in_suspend; |
66aee900 SL |
155 | }; |
156 | ||
157 | static int elants_i2c_send(struct i2c_client *client, | |
158 | const void *data, size_t size) | |
159 | { | |
160 | int ret; | |
161 | ||
162 | ret = i2c_master_send(client, data, size); | |
163 | if (ret == size) | |
164 | return 0; | |
165 | ||
166 | if (ret >= 0) | |
167 | ret = -EIO; | |
168 | ||
169 | dev_err(&client->dev, "%s failed (%*ph): %d\n", | |
170 | __func__, (int)size, data, ret); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) | |
176 | { | |
177 | int ret; | |
178 | ||
179 | ret = i2c_master_recv(client, data, size); | |
180 | if (ret == size) | |
181 | return 0; | |
182 | ||
183 | if (ret >= 0) | |
184 | ret = -EIO; | |
185 | ||
186 | dev_err(&client->dev, "%s failed: %d\n", __func__, ret); | |
187 | ||
188 | return ret; | |
189 | } | |
190 | ||
191 | static int elants_i2c_execute_command(struct i2c_client *client, | |
192 | const u8 *cmd, size_t cmd_size, | |
193 | u8 *resp, size_t resp_size) | |
194 | { | |
195 | struct i2c_msg msgs[2]; | |
196 | int ret; | |
197 | u8 expected_response; | |
198 | ||
199 | switch (cmd[0]) { | |
200 | case CMD_HEADER_READ: | |
201 | expected_response = CMD_HEADER_RESP; | |
202 | break; | |
203 | ||
204 | case CMD_HEADER_6B_READ: | |
205 | expected_response = CMD_HEADER_6B_RESP; | |
206 | break; | |
207 | ||
208 | default: | |
209 | dev_err(&client->dev, "%s: invalid command %*ph\n", | |
210 | __func__, (int)cmd_size, cmd); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | msgs[0].addr = client->addr; | |
215 | msgs[0].flags = client->flags & I2C_M_TEN; | |
216 | msgs[0].len = cmd_size; | |
217 | msgs[0].buf = (u8 *)cmd; | |
218 | ||
219 | msgs[1].addr = client->addr; | |
220 | msgs[1].flags = client->flags & I2C_M_TEN; | |
221 | msgs[1].flags |= I2C_M_RD; | |
222 | msgs[1].len = resp_size; | |
223 | msgs[1].buf = resp; | |
224 | ||
225 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
226 | if (ret < 0) | |
227 | return ret; | |
228 | ||
229 | if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response) | |
230 | return -EIO; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int elants_i2c_calibrate(struct elants_data *ts) | |
236 | { | |
237 | struct i2c_client *client = ts->client; | |
238 | int ret, error; | |
239 | static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A }; | |
240 | static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 }; | |
241 | static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; | |
242 | ||
243 | disable_irq(client->irq); | |
244 | ||
245 | ts->state = ELAN_WAIT_RECALIBRATION; | |
246 | reinit_completion(&ts->cmd_done); | |
247 | ||
248 | elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); | |
249 | elants_i2c_send(client, rek, sizeof(rek)); | |
250 | ||
251 | enable_irq(client->irq); | |
252 | ||
253 | ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, | |
254 | msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); | |
255 | ||
256 | ts->state = ELAN_STATE_NORMAL; | |
257 | ||
258 | if (ret <= 0) { | |
259 | error = ret < 0 ? ret : -ETIMEDOUT; | |
260 | dev_err(&client->dev, | |
261 | "error while waiting for calibration to complete: %d\n", | |
262 | error); | |
263 | return error; | |
264 | } | |
265 | ||
266 | if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { | |
267 | dev_err(&client->dev, | |
268 | "unexpected calibration response: %*ph\n", | |
269 | (int)sizeof(ts->cmd_resp), ts->cmd_resp); | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int elants_i2c_sw_reset(struct i2c_client *client) | |
277 | { | |
278 | const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; | |
279 | int error; | |
280 | ||
281 | error = elants_i2c_send(client, soft_rst_cmd, | |
282 | sizeof(soft_rst_cmd)); | |
283 | if (error) { | |
284 | dev_err(&client->dev, "software reset failed: %d\n", error); | |
285 | return error; | |
286 | } | |
287 | ||
288 | /* | |
289 | * We should wait at least 10 msec (but no more than 40) before | |
290 | * sending fastboot or IAP command to the device. | |
291 | */ | |
292 | msleep(30); | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static u16 elants_i2c_parse_version(u8 *buf) | |
298 | { | |
299 | return get_unaligned_be32(buf) >> 4; | |
300 | } | |
301 | ||
bc1d57fe | 302 | static int elants_i2c_query_hw_version(struct elants_data *ts) |
66aee900 SL |
303 | { |
304 | struct i2c_client *client = ts->client; | |
305 | int error, retry_cnt; | |
306 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; | |
307 | u8 resp[HEADER_SIZE]; | |
308 | ||
309 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
310 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
311 | resp, sizeof(resp)); | |
312 | if (!error) { | |
313 | ts->hw_version = elants_i2c_parse_version(resp); | |
314 | if (ts->hw_version != 0xffff) | |
315 | return 0; | |
316 | } | |
317 | ||
318 | dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n", | |
319 | error, (int)sizeof(resp), resp); | |
320 | } | |
321 | ||
bc1d57fe JC |
322 | if (error) { |
323 | dev_err(&client->dev, | |
324 | "Failed to read fw id: %d\n", error); | |
325 | return error; | |
326 | } | |
327 | ||
328 | dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); | |
66aee900 SL |
329 | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | static int elants_i2c_query_fw_version(struct elants_data *ts) | |
334 | { | |
335 | struct i2c_client *client = ts->client; | |
336 | int error, retry_cnt; | |
337 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; | |
338 | u8 resp[HEADER_SIZE]; | |
339 | ||
340 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
341 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
342 | resp, sizeof(resp)); | |
343 | if (!error) { | |
344 | ts->fw_version = elants_i2c_parse_version(resp); | |
345 | if (ts->fw_version != 0x0000 && | |
346 | ts->fw_version != 0xffff) | |
347 | return 0; | |
348 | } | |
349 | ||
350 | dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n", | |
351 | error, (int)sizeof(resp), resp); | |
352 | } | |
353 | ||
354 | dev_err(&client->dev, | |
355 | "Failed to read fw version or fw version is invalid\n"); | |
356 | ||
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | static int elants_i2c_query_test_version(struct elants_data *ts) | |
361 | { | |
362 | struct i2c_client *client = ts->client; | |
363 | int error, retry_cnt; | |
364 | u16 version; | |
365 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; | |
366 | u8 resp[HEADER_SIZE]; | |
367 | ||
368 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
369 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
370 | resp, sizeof(resp)); | |
371 | if (!error) { | |
372 | version = elants_i2c_parse_version(resp); | |
373 | ts->test_version = version >> 8; | |
374 | ts->solution_version = version & 0xff; | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | dev_dbg(&client->dev, | |
380 | "read test version error rc=%d, buf=%*phC\n", | |
381 | error, (int)sizeof(resp), resp); | |
382 | } | |
383 | ||
384 | dev_err(&client->dev, "Failed to read test version\n"); | |
385 | ||
386 | return -EINVAL; | |
387 | } | |
388 | ||
389 | static int elants_i2c_query_bc_version(struct elants_data *ts) | |
390 | { | |
391 | struct i2c_client *client = ts->client; | |
392 | const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; | |
393 | u8 resp[HEADER_SIZE]; | |
394 | u16 version; | |
395 | int error; | |
396 | ||
397 | error = elants_i2c_execute_command(client, cmd, sizeof(cmd), | |
398 | resp, sizeof(resp)); | |
399 | if (error) { | |
400 | dev_err(&client->dev, | |
401 | "read BC version error=%d, buf=%*phC\n", | |
402 | error, (int)sizeof(resp), resp); | |
403 | return error; | |
404 | } | |
405 | ||
406 | version = elants_i2c_parse_version(resp); | |
407 | ts->bc_version = version >> 8; | |
408 | ts->iap_version = version & 0xff; | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static int elants_i2c_query_ts_info(struct elants_data *ts) | |
414 | { | |
415 | struct i2c_client *client = ts->client; | |
416 | int error; | |
417 | u8 resp[17]; | |
418 | u16 phy_x, phy_y, rows, cols, osr; | |
419 | const u8 get_resolution_cmd[] = { | |
420 | CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 | |
421 | }; | |
422 | const u8 get_osr_cmd[] = { | |
423 | CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 | |
424 | }; | |
425 | const u8 get_physical_scan_cmd[] = { | |
426 | CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 | |
427 | }; | |
428 | const u8 get_physical_drive_cmd[] = { | |
429 | CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 | |
430 | }; | |
431 | ||
432 | /* Get trace number */ | |
433 | error = elants_i2c_execute_command(client, | |
434 | get_resolution_cmd, | |
435 | sizeof(get_resolution_cmd), | |
436 | resp, sizeof(resp)); | |
437 | if (error) { | |
438 | dev_err(&client->dev, "get resolution command failed: %d\n", | |
439 | error); | |
440 | return error; | |
441 | } | |
442 | ||
443 | rows = resp[2] + resp[6] + resp[10]; | |
444 | cols = resp[3] + resp[7] + resp[11]; | |
445 | ||
446 | /* Process mm_to_pixel information */ | |
447 | error = elants_i2c_execute_command(client, | |
448 | get_osr_cmd, sizeof(get_osr_cmd), | |
449 | resp, sizeof(resp)); | |
450 | if (error) { | |
451 | dev_err(&client->dev, "get osr command failed: %d\n", | |
452 | error); | |
453 | return error; | |
454 | } | |
455 | ||
456 | osr = resp[3]; | |
457 | ||
458 | error = elants_i2c_execute_command(client, | |
459 | get_physical_scan_cmd, | |
460 | sizeof(get_physical_scan_cmd), | |
461 | resp, sizeof(resp)); | |
462 | if (error) { | |
463 | dev_err(&client->dev, "get physical scan command failed: %d\n", | |
464 | error); | |
465 | return error; | |
466 | } | |
467 | ||
468 | phy_x = get_unaligned_be16(&resp[2]); | |
469 | ||
470 | error = elants_i2c_execute_command(client, | |
471 | get_physical_drive_cmd, | |
472 | sizeof(get_physical_drive_cmd), | |
473 | resp, sizeof(resp)); | |
474 | if (error) { | |
475 | dev_err(&client->dev, "get physical drive command failed: %d\n", | |
476 | error); | |
477 | return error; | |
478 | } | |
479 | ||
480 | phy_y = get_unaligned_be16(&resp[2]); | |
481 | ||
482 | dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); | |
483 | ||
484 | if (rows == 0 || cols == 0 || osr == 0) { | |
485 | dev_warn(&client->dev, | |
486 | "invalid trace number data: %d, %d, %d\n", | |
487 | rows, cols, osr); | |
488 | } else { | |
489 | /* translate trace number to TS resolution */ | |
490 | ts->x_max = ELAN_TS_RESOLUTION(rows, osr); | |
491 | ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); | |
492 | ts->y_max = ELAN_TS_RESOLUTION(cols, osr); | |
493 | ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static int elants_i2c_fastboot(struct i2c_client *client) | |
500 | { | |
501 | const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; | |
502 | int error; | |
503 | ||
504 | error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); | |
505 | if (error) { | |
506 | dev_err(&client->dev, "boot failed: %d\n", error); | |
507 | return error; | |
508 | } | |
509 | ||
510 | dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); | |
511 | return 0; | |
512 | } | |
513 | ||
514 | static int elants_i2c_initialize(struct elants_data *ts) | |
515 | { | |
516 | struct i2c_client *client = ts->client; | |
bc1d57fe | 517 | int error, error2, retry_cnt; |
66aee900 SL |
518 | const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; |
519 | const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; | |
520 | u8 buf[HEADER_SIZE]; | |
521 | ||
522 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { | |
523 | error = elants_i2c_sw_reset(client); | |
524 | if (error) { | |
525 | /* Continue initializing if it's the last try */ | |
526 | if (retry_cnt < MAX_RETRIES - 1) | |
527 | continue; | |
528 | } | |
529 | ||
530 | error = elants_i2c_fastboot(client); | |
531 | if (error) { | |
532 | /* Continue initializing if it's the last try */ | |
533 | if (retry_cnt < MAX_RETRIES - 1) | |
534 | continue; | |
535 | } | |
536 | ||
537 | /* Wait for Hello packet */ | |
538 | msleep(BOOT_TIME_DELAY_MS); | |
539 | ||
540 | error = elants_i2c_read(client, buf, sizeof(buf)); | |
541 | if (error) { | |
542 | dev_err(&client->dev, | |
543 | "failed to read 'hello' packet: %d\n", error); | |
544 | } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { | |
545 | ts->iap_mode = ELAN_IAP_OPERATIONAL; | |
546 | break; | |
547 | } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { | |
548 | /* | |
549 | * Setting error code will mark device | |
550 | * in recovery mode below. | |
551 | */ | |
552 | error = -EIO; | |
553 | break; | |
554 | } else { | |
555 | error = -EINVAL; | |
556 | dev_err(&client->dev, | |
557 | "invalid 'hello' packet: %*ph\n", | |
558 | (int)sizeof(buf), buf); | |
559 | } | |
560 | } | |
561 | ||
bc1d57fe JC |
562 | /* hw version is available even if device in recovery state */ |
563 | error2 = elants_i2c_query_hw_version(ts); | |
66aee900 | 564 | if (!error) |
bc1d57fe JC |
565 | error = error2; |
566 | ||
66aee900 SL |
567 | if (!error) |
568 | error = elants_i2c_query_fw_version(ts); | |
bc1d57fe JC |
569 | if (!error) |
570 | error = elants_i2c_query_test_version(ts); | |
571 | if (!error) | |
572 | error = elants_i2c_query_bc_version(ts); | |
573 | if (!error) | |
574 | error = elants_i2c_query_ts_info(ts); | |
66aee900 | 575 | |
bc1d57fe | 576 | if (error) |
66aee900 | 577 | ts->iap_mode = ELAN_IAP_RECOVERY; |
66aee900 SL |
578 | |
579 | return 0; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Firmware update interface. | |
584 | */ | |
585 | ||
586 | static int elants_i2c_fw_write_page(struct i2c_client *client, | |
587 | const void *page) | |
588 | { | |
589 | const u8 ack_ok[] = { 0xaa, 0xaa }; | |
590 | u8 buf[2]; | |
591 | int retry; | |
592 | int error; | |
593 | ||
594 | for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { | |
595 | error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); | |
596 | if (error) { | |
597 | dev_err(&client->dev, | |
598 | "IAP Write Page failed: %d\n", error); | |
599 | continue; | |
600 | } | |
601 | ||
602 | error = elants_i2c_read(client, buf, 2); | |
603 | if (error) { | |
604 | dev_err(&client->dev, | |
605 | "IAP Ack read failed: %d\n", error); | |
606 | return error; | |
607 | } | |
608 | ||
609 | if (!memcmp(buf, ack_ok, sizeof(ack_ok))) | |
610 | return 0; | |
611 | ||
612 | error = -EIO; | |
613 | dev_err(&client->dev, | |
614 | "IAP Get Ack Error [%02x:%02x]\n", | |
615 | buf[0], buf[1]); | |
616 | } | |
617 | ||
618 | return error; | |
619 | } | |
620 | ||
621 | static int elants_i2c_do_update_firmware(struct i2c_client *client, | |
622 | const struct firmware *fw, | |
623 | bool force) | |
624 | { | |
625 | const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; | |
626 | const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; | |
627 | const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; | |
6fd38502 | 628 | const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01}; |
66aee900 SL |
629 | u8 buf[HEADER_SIZE]; |
630 | u16 send_id; | |
631 | int page, n_fw_pages; | |
632 | int error; | |
633 | ||
634 | /* Recovery mode detection! */ | |
635 | if (force) { | |
636 | dev_dbg(&client->dev, "Recovery mode procedure\n"); | |
637 | error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); | |
638 | } else { | |
639 | /* Start IAP Procedure */ | |
640 | dev_dbg(&client->dev, "Normal IAP procedure\n"); | |
6fd38502 JC |
641 | /* Close idle mode */ |
642 | error = elants_i2c_send(client, close_idle, sizeof(close_idle)); | |
643 | if (error) | |
644 | dev_err(&client->dev, "Failed close idle: %d\n", error); | |
645 | msleep(60); | |
66aee900 | 646 | elants_i2c_sw_reset(client); |
6fd38502 | 647 | msleep(20); |
66aee900 SL |
648 | error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); |
649 | } | |
650 | ||
651 | if (error) { | |
652 | dev_err(&client->dev, "failed to enter IAP mode: %d\n", error); | |
653 | return error; | |
654 | } | |
655 | ||
656 | msleep(20); | |
657 | ||
658 | /* check IAP state */ | |
659 | error = elants_i2c_read(client, buf, 4); | |
660 | if (error) { | |
661 | dev_err(&client->dev, | |
662 | "failed to read IAP acknowledgement: %d\n", | |
663 | error); | |
664 | return error; | |
665 | } | |
666 | ||
667 | if (memcmp(buf, iap_ack, sizeof(iap_ack))) { | |
668 | dev_err(&client->dev, | |
669 | "failed to enter IAP: %*ph (expected %*ph)\n", | |
670 | (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); | |
671 | return -EIO; | |
672 | } | |
673 | ||
674 | dev_info(&client->dev, "successfully entered IAP mode"); | |
675 | ||
676 | send_id = client->addr; | |
677 | error = elants_i2c_send(client, &send_id, 1); | |
678 | if (error) { | |
679 | dev_err(&client->dev, "sending dummy byte failed: %d\n", | |
680 | error); | |
681 | return error; | |
682 | } | |
683 | ||
684 | /* Clear the last page of Master */ | |
685 | error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); | |
686 | if (error) { | |
687 | dev_err(&client->dev, "clearing of the last page failed: %d\n", | |
688 | error); | |
689 | return error; | |
690 | } | |
691 | ||
692 | error = elants_i2c_read(client, buf, 2); | |
693 | if (error) { | |
694 | dev_err(&client->dev, | |
695 | "failed to read ACK for clearing the last page: %d\n", | |
696 | error); | |
697 | return error; | |
698 | } | |
699 | ||
700 | n_fw_pages = fw->size / ELAN_FW_PAGESIZE; | |
701 | dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); | |
702 | ||
703 | for (page = 0; page < n_fw_pages; page++) { | |
704 | error = elants_i2c_fw_write_page(client, | |
705 | fw->data + page * ELAN_FW_PAGESIZE); | |
706 | if (error) { | |
707 | dev_err(&client->dev, | |
708 | "failed to write FW page %d: %d\n", | |
709 | page, error); | |
710 | return error; | |
711 | } | |
712 | } | |
713 | ||
714 | /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ | |
715 | msleep(300); | |
716 | ||
717 | dev_info(&client->dev, "firmware update completed\n"); | |
718 | return 0; | |
719 | } | |
720 | ||
721 | static int elants_i2c_fw_update(struct elants_data *ts) | |
722 | { | |
723 | struct i2c_client *client = ts->client; | |
724 | const struct firmware *fw; | |
37dee1ac | 725 | char *fw_name; |
66aee900 SL |
726 | int error; |
727 | ||
8c0776a8 | 728 | fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); |
37dee1ac CM |
729 | if (!fw_name) |
730 | return -ENOMEM; | |
731 | ||
732 | dev_info(&client->dev, "requesting fw name = %s\n", fw_name); | |
733 | error = request_firmware(&fw, fw_name, &client->dev); | |
734 | kfree(fw_name); | |
66aee900 | 735 | if (error) { |
37dee1ac CM |
736 | dev_err(&client->dev, "failed to request firmware: %d\n", |
737 | error); | |
66aee900 SL |
738 | return error; |
739 | } | |
740 | ||
741 | if (fw->size % ELAN_FW_PAGESIZE) { | |
742 | dev_err(&client->dev, "invalid firmware length: %zu\n", | |
743 | fw->size); | |
744 | error = -EINVAL; | |
745 | goto out; | |
746 | } | |
747 | ||
748 | disable_irq(client->irq); | |
749 | ||
750 | error = elants_i2c_do_update_firmware(client, fw, | |
751 | ts->iap_mode == ELAN_IAP_RECOVERY); | |
752 | if (error) { | |
753 | dev_err(&client->dev, "firmware update failed: %d\n", error); | |
754 | ts->iap_mode = ELAN_IAP_RECOVERY; | |
755 | goto out_enable_irq; | |
756 | } | |
757 | ||
758 | error = elants_i2c_initialize(ts); | |
759 | if (error) { | |
760 | dev_err(&client->dev, | |
761 | "failed to initialize device after firmware update: %d\n", | |
762 | error); | |
763 | ts->iap_mode = ELAN_IAP_RECOVERY; | |
764 | goto out_enable_irq; | |
765 | } | |
766 | ||
767 | ts->iap_mode = ELAN_IAP_OPERATIONAL; | |
768 | ||
769 | out_enable_irq: | |
770 | ts->state = ELAN_STATE_NORMAL; | |
771 | enable_irq(client->irq); | |
772 | msleep(100); | |
773 | ||
774 | if (!error) | |
775 | elants_i2c_calibrate(ts); | |
776 | out: | |
777 | release_firmware(fw); | |
778 | return error; | |
779 | } | |
780 | ||
781 | /* | |
782 | * Event reporting. | |
783 | */ | |
784 | ||
785 | static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) | |
786 | { | |
787 | struct input_dev *input = ts->input; | |
788 | unsigned int n_fingers; | |
789 | u16 finger_state; | |
790 | int i; | |
791 | ||
792 | n_fingers = buf[FW_POS_STATE + 1] & 0x0f; | |
793 | finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | | |
794 | buf[FW_POS_STATE]; | |
795 | ||
796 | dev_dbg(&ts->client->dev, | |
797 | "n_fingers: %u, state: %04x\n", n_fingers, finger_state); | |
798 | ||
799 | for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { | |
800 | if (finger_state & 1) { | |
801 | unsigned int x, y, p, w; | |
802 | u8 *pos; | |
803 | ||
804 | pos = &buf[FW_POS_XY + i * 3]; | |
805 | x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; | |
806 | y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; | |
807 | p = buf[FW_POS_PRESSURE + i]; | |
808 | w = buf[FW_POS_WIDTH + i]; | |
809 | ||
810 | dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", | |
811 | i, x, y, p, w); | |
812 | ||
813 | input_mt_slot(input, i); | |
814 | input_mt_report_slot_state(input, MT_TOOL_FINGER, true); | |
815 | input_event(input, EV_ABS, ABS_MT_POSITION_X, x); | |
816 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, y); | |
817 | input_event(input, EV_ABS, ABS_MT_PRESSURE, p); | |
818 | input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); | |
819 | ||
820 | n_fingers--; | |
821 | } | |
822 | ||
823 | finger_state >>= 1; | |
824 | } | |
825 | ||
826 | input_mt_sync_frame(input); | |
827 | input_sync(input); | |
828 | } | |
829 | ||
830 | static u8 elants_i2c_calculate_checksum(u8 *buf) | |
831 | { | |
832 | u8 checksum = 0; | |
833 | u8 i; | |
834 | ||
835 | for (i = 0; i < FW_POS_CHECKSUM; i++) | |
836 | checksum += buf[i]; | |
837 | ||
838 | return checksum; | |
839 | } | |
840 | ||
841 | static void elants_i2c_event(struct elants_data *ts, u8 *buf) | |
842 | { | |
843 | u8 checksum = elants_i2c_calculate_checksum(buf); | |
844 | ||
845 | if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) | |
846 | dev_warn(&ts->client->dev, | |
847 | "%s: invalid checksum for packet %02x: %02x vs. %02x\n", | |
848 | __func__, buf[FW_POS_HEADER], | |
849 | checksum, buf[FW_POS_CHECKSUM]); | |
850 | else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) | |
851 | dev_warn(&ts->client->dev, | |
852 | "%s: unknown packet type: %02x\n", | |
853 | __func__, buf[FW_POS_HEADER]); | |
854 | else | |
855 | elants_i2c_mt_event(ts, buf); | |
856 | } | |
857 | ||
858 | static irqreturn_t elants_i2c_irq(int irq, void *_dev) | |
859 | { | |
860 | const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; | |
861 | struct elants_data *ts = _dev; | |
862 | struct i2c_client *client = ts->client; | |
863 | int report_count, report_len; | |
864 | int i; | |
865 | int len; | |
866 | ||
867 | len = i2c_master_recv(client, ts->buf, sizeof(ts->buf)); | |
868 | if (len < 0) { | |
869 | dev_err(&client->dev, "%s: failed to read data: %d\n", | |
870 | __func__, len); | |
871 | goto out; | |
872 | } | |
873 | ||
874 | dev_dbg(&client->dev, "%s: packet %*ph\n", | |
875 | __func__, HEADER_SIZE, ts->buf); | |
876 | ||
877 | switch (ts->state) { | |
878 | case ELAN_WAIT_RECALIBRATION: | |
879 | if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { | |
880 | memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); | |
881 | complete(&ts->cmd_done); | |
882 | ts->state = ELAN_STATE_NORMAL; | |
883 | } | |
884 | break; | |
885 | ||
886 | case ELAN_WAIT_QUEUE_HEADER: | |
887 | if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) | |
888 | break; | |
889 | ||
890 | ts->state = ELAN_STATE_NORMAL; | |
891 | /* fall through */ | |
892 | ||
893 | case ELAN_STATE_NORMAL: | |
894 | ||
895 | switch (ts->buf[FW_HDR_TYPE]) { | |
896 | case CMD_HEADER_HELLO: | |
897 | case CMD_HEADER_RESP: | |
898 | case CMD_HEADER_REK: | |
899 | break; | |
900 | ||
901 | case QUEUE_HEADER_WAIT: | |
902 | if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { | |
903 | dev_err(&client->dev, | |
904 | "invalid wait packet %*ph\n", | |
905 | HEADER_SIZE, ts->buf); | |
906 | } else { | |
907 | ts->state = ELAN_WAIT_QUEUE_HEADER; | |
908 | udelay(30); | |
909 | } | |
910 | break; | |
911 | ||
912 | case QUEUE_HEADER_SINGLE: | |
913 | elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); | |
914 | break; | |
915 | ||
916 | case QUEUE_HEADER_NORMAL: | |
917 | report_count = ts->buf[FW_HDR_COUNT]; | |
1c3415a0 | 918 | if (report_count == 0 || report_count > 3) { |
66aee900 | 919 | dev_err(&client->dev, |
1c3415a0 | 920 | "bad report count: %*ph\n", |
66aee900 SL |
921 | HEADER_SIZE, ts->buf); |
922 | break; | |
923 | } | |
924 | ||
925 | report_len = ts->buf[FW_HDR_LENGTH] / report_count; | |
926 | if (report_len != PACKET_SIZE) { | |
927 | dev_err(&client->dev, | |
928 | "mismatching report length: %*ph\n", | |
929 | HEADER_SIZE, ts->buf); | |
930 | break; | |
931 | } | |
932 | ||
933 | for (i = 0; i < report_count; i++) { | |
934 | u8 *buf = ts->buf + HEADER_SIZE + | |
935 | i * PACKET_SIZE; | |
936 | elants_i2c_event(ts, buf); | |
937 | } | |
938 | break; | |
939 | ||
940 | default: | |
941 | dev_err(&client->dev, "unknown packet %*ph\n", | |
942 | HEADER_SIZE, ts->buf); | |
943 | break; | |
944 | } | |
945 | break; | |
946 | } | |
947 | ||
948 | out: | |
949 | return IRQ_HANDLED; | |
950 | } | |
951 | ||
952 | /* | |
953 | * sysfs interface | |
954 | */ | |
955 | static ssize_t calibrate_store(struct device *dev, | |
956 | struct device_attribute *attr, | |
957 | const char *buf, size_t count) | |
958 | { | |
959 | struct i2c_client *client = to_i2c_client(dev); | |
960 | struct elants_data *ts = i2c_get_clientdata(client); | |
961 | int error; | |
962 | ||
963 | error = mutex_lock_interruptible(&ts->sysfs_mutex); | |
964 | if (error) | |
965 | return error; | |
966 | ||
967 | error = elants_i2c_calibrate(ts); | |
968 | ||
969 | mutex_unlock(&ts->sysfs_mutex); | |
970 | return error ?: count; | |
971 | } | |
972 | ||
973 | static ssize_t write_update_fw(struct device *dev, | |
974 | struct device_attribute *attr, | |
975 | const char *buf, size_t count) | |
976 | { | |
977 | struct i2c_client *client = to_i2c_client(dev); | |
978 | struct elants_data *ts = i2c_get_clientdata(client); | |
979 | int error; | |
980 | ||
981 | error = mutex_lock_interruptible(&ts->sysfs_mutex); | |
982 | if (error) | |
983 | return error; | |
984 | ||
985 | error = elants_i2c_fw_update(ts); | |
986 | dev_dbg(dev, "firmware update result: %d\n", error); | |
987 | ||
988 | mutex_unlock(&ts->sysfs_mutex); | |
989 | return error ?: count; | |
990 | } | |
991 | ||
992 | static ssize_t show_iap_mode(struct device *dev, | |
993 | struct device_attribute *attr, char *buf) | |
994 | { | |
995 | struct i2c_client *client = to_i2c_client(dev); | |
996 | struct elants_data *ts = i2c_get_clientdata(client); | |
997 | ||
998 | return sprintf(buf, "%s\n", | |
999 | ts->iap_mode == ELAN_IAP_OPERATIONAL ? | |
1000 | "Normal" : "Recovery"); | |
1001 | } | |
1002 | ||
1003 | static DEVICE_ATTR(calibrate, S_IWUSR, NULL, calibrate_store); | |
1004 | static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); | |
1005 | static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); | |
1006 | ||
1007 | struct elants_version_attribute { | |
1008 | struct device_attribute dattr; | |
1009 | size_t field_offset; | |
1010 | size_t field_size; | |
1011 | }; | |
1012 | ||
1013 | #define __ELANTS_FIELD_SIZE(_field) \ | |
1014 | sizeof(((struct elants_data *)NULL)->_field) | |
1015 | #define __ELANTS_VERIFY_SIZE(_field) \ | |
1016 | (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ | |
1017 | __ELANTS_FIELD_SIZE(_field)) | |
1018 | #define ELANTS_VERSION_ATTR(_field) \ | |
1019 | struct elants_version_attribute elants_ver_attr_##_field = { \ | |
1020 | .dattr = __ATTR(_field, S_IRUGO, \ | |
1021 | elants_version_attribute_show, NULL), \ | |
1022 | .field_offset = offsetof(struct elants_data, _field), \ | |
1023 | .field_size = __ELANTS_VERIFY_SIZE(_field), \ | |
1024 | } | |
1025 | ||
1026 | static ssize_t elants_version_attribute_show(struct device *dev, | |
1027 | struct device_attribute *dattr, | |
1028 | char *buf) | |
1029 | { | |
1030 | struct i2c_client *client = to_i2c_client(dev); | |
1031 | struct elants_data *ts = i2c_get_clientdata(client); | |
1032 | struct elants_version_attribute *attr = | |
1033 | container_of(dattr, struct elants_version_attribute, dattr); | |
1034 | u8 *field = (u8 *)((char *)ts + attr->field_offset); | |
1035 | unsigned int fmt_size; | |
1036 | unsigned int val; | |
1037 | ||
1038 | if (attr->field_size == 1) { | |
1039 | val = *field; | |
1040 | fmt_size = 2; /* 2 HEX digits */ | |
1041 | } else { | |
1042 | val = *(u16 *)field; | |
1043 | fmt_size = 4; /* 4 HEX digits */ | |
1044 | } | |
1045 | ||
1046 | return sprintf(buf, "%0*x\n", fmt_size, val); | |
1047 | } | |
1048 | ||
1049 | static ELANTS_VERSION_ATTR(fw_version); | |
1050 | static ELANTS_VERSION_ATTR(hw_version); | |
1051 | static ELANTS_VERSION_ATTR(test_version); | |
1052 | static ELANTS_VERSION_ATTR(solution_version); | |
1053 | static ELANTS_VERSION_ATTR(bc_version); | |
1054 | static ELANTS_VERSION_ATTR(iap_version); | |
1055 | ||
1056 | static struct attribute *elants_attributes[] = { | |
1057 | &dev_attr_calibrate.attr, | |
1058 | &dev_attr_update_fw.attr, | |
1059 | &dev_attr_iap_mode.attr, | |
1060 | ||
1061 | &elants_ver_attr_fw_version.dattr.attr, | |
1062 | &elants_ver_attr_hw_version.dattr.attr, | |
1063 | &elants_ver_attr_test_version.dattr.attr, | |
1064 | &elants_ver_attr_solution_version.dattr.attr, | |
1065 | &elants_ver_attr_bc_version.dattr.attr, | |
1066 | &elants_ver_attr_iap_version.dattr.attr, | |
1067 | NULL | |
1068 | }; | |
1069 | ||
48f960dd | 1070 | static const struct attribute_group elants_attribute_group = { |
66aee900 SL |
1071 | .attrs = elants_attributes, |
1072 | }; | |
1073 | ||
afe10358 DT |
1074 | static int elants_i2c_power_on(struct elants_data *ts) |
1075 | { | |
1076 | int error; | |
1077 | ||
1078 | /* | |
1079 | * If we do not have reset gpio assume platform firmware | |
1080 | * controls regulators and does power them on for us. | |
1081 | */ | |
1082 | if (IS_ERR_OR_NULL(ts->reset_gpio)) | |
1083 | return 0; | |
1084 | ||
1085 | gpiod_set_value_cansleep(ts->reset_gpio, 1); | |
1086 | ||
1087 | error = regulator_enable(ts->vcc33); | |
1088 | if (error) { | |
1089 | dev_err(&ts->client->dev, | |
1090 | "failed to enable vcc33 regulator: %d\n", | |
1091 | error); | |
1092 | goto release_reset_gpio; | |
1093 | } | |
1094 | ||
1095 | error = regulator_enable(ts->vccio); | |
1096 | if (error) { | |
1097 | dev_err(&ts->client->dev, | |
1098 | "failed to enable vccio regulator: %d\n", | |
1099 | error); | |
1100 | regulator_disable(ts->vcc33); | |
1101 | goto release_reset_gpio; | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * We need to wait a bit after powering on controller before | |
1106 | * we are allowed to release reset GPIO. | |
1107 | */ | |
1108 | udelay(ELAN_POWERON_DELAY_USEC); | |
1109 | ||
1110 | release_reset_gpio: | |
1111 | gpiod_set_value_cansleep(ts->reset_gpio, 0); | |
1112 | if (error) | |
1113 | return error; | |
1114 | ||
1115 | msleep(ELAN_RESET_DELAY_MSEC); | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static void elants_i2c_power_off(void *_data) | |
1121 | { | |
1122 | struct elants_data *ts = _data; | |
1123 | ||
1124 | if (!IS_ERR_OR_NULL(ts->reset_gpio)) { | |
1125 | /* | |
1126 | * Activate reset gpio to prevent leakage through the | |
1127 | * pin once we shut off power to the controller. | |
1128 | */ | |
1129 | gpiod_set_value_cansleep(ts->reset_gpio, 1); | |
1130 | regulator_disable(ts->vccio); | |
1131 | regulator_disable(ts->vcc33); | |
1132 | } | |
1133 | } | |
1134 | ||
66aee900 SL |
1135 | static int elants_i2c_probe(struct i2c_client *client, |
1136 | const struct i2c_device_id *id) | |
1137 | { | |
1138 | union i2c_smbus_data dummy; | |
1139 | struct elants_data *ts; | |
1140 | unsigned long irqflags; | |
1141 | int error; | |
1142 | ||
1143 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
1144 | dev_err(&client->dev, | |
1145 | "%s: i2c check functionality error\n", DEVICE_NAME); | |
1146 | return -ENXIO; | |
1147 | } | |
1148 | ||
66aee900 SL |
1149 | ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); |
1150 | if (!ts) | |
1151 | return -ENOMEM; | |
1152 | ||
1153 | mutex_init(&ts->sysfs_mutex); | |
1154 | init_completion(&ts->cmd_done); | |
1155 | ||
1156 | ts->client = client; | |
1157 | i2c_set_clientdata(client, ts); | |
1158 | ||
afe10358 DT |
1159 | ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); |
1160 | if (IS_ERR(ts->vcc33)) { | |
1161 | error = PTR_ERR(ts->vcc33); | |
1162 | if (error != -EPROBE_DEFER) | |
1163 | dev_err(&client->dev, | |
1164 | "Failed to get 'vcc33' regulator: %d\n", | |
1165 | error); | |
1166 | return error; | |
1167 | } | |
1168 | ||
1169 | ts->vccio = devm_regulator_get(&client->dev, "vccio"); | |
1170 | if (IS_ERR(ts->vccio)) { | |
1171 | error = PTR_ERR(ts->vccio); | |
1172 | if (error != -EPROBE_DEFER) | |
1173 | dev_err(&client->dev, | |
1174 | "Failed to get 'vccio' regulator: %d\n", | |
1175 | error); | |
1176 | return error; | |
1177 | } | |
1178 | ||
7229b87b | 1179 | ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); |
afe10358 DT |
1180 | if (IS_ERR(ts->reset_gpio)) { |
1181 | error = PTR_ERR(ts->reset_gpio); | |
1182 | ||
1183 | if (error == -EPROBE_DEFER) | |
1184 | return error; | |
1185 | ||
1186 | if (error != -ENOENT && error != -ENOSYS) { | |
1187 | dev_err(&client->dev, | |
1188 | "failed to get reset gpio: %d\n", | |
1189 | error); | |
1190 | return error; | |
1191 | } | |
1192 | ||
1193 | ts->keep_power_in_suspend = true; | |
afe10358 DT |
1194 | } |
1195 | ||
1196 | error = elants_i2c_power_on(ts); | |
1197 | if (error) | |
1198 | return error; | |
1199 | ||
1200 | error = devm_add_action(&client->dev, elants_i2c_power_off, ts); | |
1201 | if (error) { | |
1202 | dev_err(&client->dev, | |
1203 | "failed to install power off action: %d\n", error); | |
1204 | elants_i2c_power_off(ts); | |
1205 | return error; | |
1206 | } | |
1207 | ||
1208 | /* Make sure there is something at this address */ | |
1209 | if (i2c_smbus_xfer(client->adapter, client->addr, 0, | |
1210 | I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { | |
1211 | dev_err(&client->dev, "nothing at this address\n"); | |
1212 | return -ENXIO; | |
1213 | } | |
1214 | ||
66aee900 SL |
1215 | error = elants_i2c_initialize(ts); |
1216 | if (error) { | |
1217 | dev_err(&client->dev, "failed to initialize: %d\n", error); | |
1218 | return error; | |
1219 | } | |
1220 | ||
1221 | ts->input = devm_input_allocate_device(&client->dev); | |
1222 | if (!ts->input) { | |
1223 | dev_err(&client->dev, "Failed to allocate input device\n"); | |
1224 | return -ENOMEM; | |
1225 | } | |
1226 | ||
1227 | ts->input->name = "Elan Touchscreen"; | |
1228 | ts->input->id.bustype = BUS_I2C; | |
1229 | ||
1230 | __set_bit(BTN_TOUCH, ts->input->keybit); | |
1231 | __set_bit(EV_ABS, ts->input->evbit); | |
1232 | __set_bit(EV_KEY, ts->input->evbit); | |
1233 | ||
1234 | /* Single touch input params setup */ | |
1235 | input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0); | |
1236 | input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0); | |
1237 | input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0); | |
1238 | input_abs_set_res(ts->input, ABS_X, ts->x_res); | |
1239 | input_abs_set_res(ts->input, ABS_Y, ts->y_res); | |
1240 | ||
1241 | /* Multitouch input params setup */ | |
1242 | error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, | |
1243 | INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); | |
1244 | if (error) { | |
1245 | dev_err(&client->dev, | |
1246 | "failed to initialize MT slots: %d\n", error); | |
1247 | return error; | |
1248 | } | |
1249 | ||
1250 | input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); | |
1251 | input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); | |
1252 | input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); | |
1253 | input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); | |
1254 | input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); | |
1255 | input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); | |
1256 | ||
66aee900 SL |
1257 | error = input_register_device(ts->input); |
1258 | if (error) { | |
1259 | dev_err(&client->dev, | |
1260 | "unable to register input device: %d\n", error); | |
1261 | return error; | |
1262 | } | |
1263 | ||
1264 | /* | |
4c83c071 DT |
1265 | * Platform code (ACPI, DTS) should normally set up interrupt |
1266 | * for us, but in case it did not let's fall back to using falling | |
1267 | * edge to be compatible with older Chromebooks. | |
66aee900 | 1268 | */ |
4c83c071 DT |
1269 | irqflags = irq_get_trigger_type(client->irq); |
1270 | if (!irqflags) | |
1271 | irqflags = IRQF_TRIGGER_FALLING; | |
66aee900 SL |
1272 | |
1273 | error = devm_request_threaded_irq(&client->dev, client->irq, | |
1274 | NULL, elants_i2c_irq, | |
1275 | irqflags | IRQF_ONESHOT, | |
1276 | client->name, ts); | |
1277 | if (error) { | |
1278 | dev_err(&client->dev, "Failed to register interrupt\n"); | |
1279 | return error; | |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Systems using device tree should set up wakeup via DTS, | |
1284 | * the rest will configure device as wakeup source by default. | |
1285 | */ | |
1286 | if (!client->dev.of_node) | |
1287 | device_init_wakeup(&client->dev, true); | |
1288 | ||
8db69a9a | 1289 | error = devm_device_add_group(&client->dev, &elants_attribute_group); |
66aee900 SL |
1290 | if (error) { |
1291 | dev_err(&client->dev, "failed to create sysfs attributes: %d\n", | |
1292 | error); | |
1293 | return error; | |
1294 | } | |
1295 | ||
66aee900 SL |
1296 | return 0; |
1297 | } | |
1298 | ||
1299 | static int __maybe_unused elants_i2c_suspend(struct device *dev) | |
1300 | { | |
1301 | struct i2c_client *client = to_i2c_client(dev); | |
1302 | struct elants_data *ts = i2c_get_clientdata(client); | |
1303 | const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 }; | |
1304 | int retry_cnt; | |
1305 | int error; | |
1306 | ||
1307 | /* Command not support in IAP recovery mode */ | |
1308 | if (ts->iap_mode != ELAN_IAP_OPERATIONAL) | |
1309 | return -EBUSY; | |
1310 | ||
1311 | disable_irq(client->irq); | |
1312 | ||
478e5ed1 JC |
1313 | if (device_may_wakeup(dev)) { |
1314 | /* | |
1315 | * The device will automatically enter idle mode | |
1316 | * that has reduced power consumption. | |
1317 | */ | |
1318 | ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); | |
1319 | } else if (ts->keep_power_in_suspend) { | |
afe10358 DT |
1320 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
1321 | error = elants_i2c_send(client, set_sleep_cmd, | |
1322 | sizeof(set_sleep_cmd)); | |
1323 | if (!error) | |
1324 | break; | |
66aee900 | 1325 | |
afe10358 DT |
1326 | dev_err(&client->dev, |
1327 | "suspend command failed: %d\n", error); | |
1328 | } | |
afe10358 DT |
1329 | } else { |
1330 | elants_i2c_power_off(ts); | |
1331 | } | |
66aee900 SL |
1332 | |
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | static int __maybe_unused elants_i2c_resume(struct device *dev) | |
1337 | { | |
1338 | struct i2c_client *client = to_i2c_client(dev); | |
1339 | struct elants_data *ts = i2c_get_clientdata(client); | |
1340 | const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 }; | |
1341 | int retry_cnt; | |
1342 | int error; | |
1343 | ||
478e5ed1 JC |
1344 | if (device_may_wakeup(dev)) { |
1345 | if (ts->wake_irq_enabled) | |
1346 | disable_irq_wake(client->irq); | |
1347 | elants_i2c_sw_reset(client); | |
1348 | } else if (ts->keep_power_in_suspend) { | |
afe10358 DT |
1349 | for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
1350 | error = elants_i2c_send(client, set_active_cmd, | |
1351 | sizeof(set_active_cmd)); | |
1352 | if (!error) | |
1353 | break; | |
66aee900 | 1354 | |
afe10358 DT |
1355 | dev_err(&client->dev, |
1356 | "resume command failed: %d\n", error); | |
1357 | } | |
1358 | } else { | |
1359 | elants_i2c_power_on(ts); | |
1360 | elants_i2c_initialize(ts); | |
66aee900 SL |
1361 | } |
1362 | ||
1363 | ts->state = ELAN_STATE_NORMAL; | |
1364 | enable_irq(client->irq); | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, | |
1370 | elants_i2c_suspend, elants_i2c_resume); | |
1371 | ||
1372 | static const struct i2c_device_id elants_i2c_id[] = { | |
1373 | { DEVICE_NAME, 0 }, | |
1374 | { } | |
1375 | }; | |
1376 | MODULE_DEVICE_TABLE(i2c, elants_i2c_id); | |
1377 | ||
1378 | #ifdef CONFIG_ACPI | |
1379 | static const struct acpi_device_id elants_acpi_id[] = { | |
1380 | { "ELAN0001", 0 }, | |
1381 | { } | |
1382 | }; | |
1383 | MODULE_DEVICE_TABLE(acpi, elants_acpi_id); | |
1384 | #endif | |
1385 | ||
1386 | #ifdef CONFIG_OF | |
1387 | static const struct of_device_id elants_of_match[] = { | |
1388 | { .compatible = "elan,ekth3500" }, | |
1389 | { /* sentinel */ } | |
1390 | }; | |
1391 | MODULE_DEVICE_TABLE(of, elants_of_match); | |
1392 | #endif | |
1393 | ||
1394 | static struct i2c_driver elants_i2c_driver = { | |
1395 | .probe = elants_i2c_probe, | |
1396 | .id_table = elants_i2c_id, | |
1397 | .driver = { | |
1398 | .name = DEVICE_NAME, | |
66aee900 SL |
1399 | .pm = &elants_i2c_pm_ops, |
1400 | .acpi_match_table = ACPI_PTR(elants_acpi_id), | |
1401 | .of_match_table = of_match_ptr(elants_of_match), | |
9f6a07b6 | 1402 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
66aee900 SL |
1403 | }, |
1404 | }; | |
1405 | module_i2c_driver(elants_i2c_driver); | |
1406 | ||
1407 | MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); | |
1408 | MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); | |
1409 | MODULE_VERSION(DRV_VERSION); | |
1410 | MODULE_LICENSE("GPL"); |