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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / input / touchscreen / hideep.c
blobddad4a82a5e55c28635f33f8c5f91490e5c81e96
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012-2017 Hideep, Inc.
4 */
5
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/firmware.h>
9 #include <linux/delay.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/i2c.h>
12 #include <linux/acpi.h>
13 #include <linux/interrupt.h>
14 #include <linux/regmap.h>
15 #include <linux/sysfs.h>
16 #include <linux/input.h>
17 #include <linux/input/mt.h>
18 #include <linux/input/touchscreen.h>
19 #include <linux/regulator/consumer.h>
20 #include <asm/unaligned.h>
21
22 #define HIDEEP_TS_NAME "HiDeep Touchscreen"
23 #define HIDEEP_I2C_NAME "hideep_ts"
24
25 #define HIDEEP_MT_MAX 10
26 #define HIDEEP_KEY_MAX 3
27
28 /* count(2) + touch data(100) + key data(6) */
29 #define HIDEEP_MAX_EVENT 108UL
30
31 #define HIDEEP_TOUCH_EVENT_INDEX 2
32 #define HIDEEP_KEY_EVENT_INDEX 102
33
34 /* Touch & key event */
35 #define HIDEEP_EVENT_ADDR 0x240
36
37 /* command list */
38 #define HIDEEP_RESET_CMD 0x9800
39
40 /* event bit */
41 #define HIDEEP_MT_RELEASED BIT(4)
42 #define HIDEEP_KEY_PRESSED BIT(7)
43 #define HIDEEP_KEY_FIRST_PRESSED BIT(8)
44 #define HIDEEP_KEY_PRESSED_MASK (HIDEEP_KEY_PRESSED | \
45 HIDEEP_KEY_FIRST_PRESSED)
46
47 #define HIDEEP_KEY_IDX_MASK 0x0f
48
49 /* For NVM */
50 #define HIDEEP_YRAM_BASE 0x40000000
51 #define HIDEEP_PERIPHERAL_BASE 0x50000000
52 #define HIDEEP_ESI_BASE (HIDEEP_PERIPHERAL_BASE + 0x00000000)
53 #define HIDEEP_FLASH_BASE (HIDEEP_PERIPHERAL_BASE + 0x01000000)
54 #define HIDEEP_SYSCON_BASE (HIDEEP_PERIPHERAL_BASE + 0x02000000)
55
56 #define HIDEEP_SYSCON_MOD_CON (HIDEEP_SYSCON_BASE + 0x0000)
57 #define HIDEEP_SYSCON_SPC_CON (HIDEEP_SYSCON_BASE + 0x0004)
58 #define HIDEEP_SYSCON_CLK_CON (HIDEEP_SYSCON_BASE + 0x0008)
59 #define HIDEEP_SYSCON_CLK_ENA (HIDEEP_SYSCON_BASE + 0x000C)
60 #define HIDEEP_SYSCON_RST_CON (HIDEEP_SYSCON_BASE + 0x0010)
61 #define HIDEEP_SYSCON_WDT_CON (HIDEEP_SYSCON_BASE + 0x0014)
62 #define HIDEEP_SYSCON_WDT_CNT (HIDEEP_SYSCON_BASE + 0x0018)
63 #define HIDEEP_SYSCON_PWR_CON (HIDEEP_SYSCON_BASE + 0x0020)
64 #define HIDEEP_SYSCON_PGM_ID (HIDEEP_SYSCON_BASE + 0x00F4)
65
66 #define HIDEEP_FLASH_CON (HIDEEP_FLASH_BASE + 0x0000)
67 #define HIDEEP_FLASH_STA (HIDEEP_FLASH_BASE + 0x0004)
68 #define HIDEEP_FLASH_CFG (HIDEEP_FLASH_BASE + 0x0008)
69 #define HIDEEP_FLASH_TIM (HIDEEP_FLASH_BASE + 0x000C)
70 #define HIDEEP_FLASH_CACHE_CFG (HIDEEP_FLASH_BASE + 0x0010)
71 #define HIDEEP_FLASH_PIO_SIG (HIDEEP_FLASH_BASE + 0x400000)
72
73 #define HIDEEP_ESI_TX_INVALID (HIDEEP_ESI_BASE + 0x0008)
74
75 #define HIDEEP_PERASE 0x00040000
76 #define HIDEEP_WRONLY 0x00100000
77
78 #define HIDEEP_NVM_MASK_OFS 0x0000000C
79 #define HIDEEP_NVM_DEFAULT_PAGE 0
80 #define HIDEEP_NVM_SFR_WPAGE 1
81 #define HIDEEP_NVM_SFR_RPAGE 2
82
83 #define HIDEEP_PIO_SIG 0x00400000
84 #define HIDEEP_PROT_MODE 0x03400000
85
86 #define HIDEEP_NVM_PAGE_SIZE 128
87
88 #define HIDEEP_DWZ_INFO 0x000002C0
89
90 struct hideep_event {
91 __le16 x;
92 __le16 y;
93 __le16 z;
94 u8 w;
95 u8 flag;
96 u8 type;
97 u8 index;
98 };
99
100 struct dwz_info {
101 __be32 code_start;
102 u8 code_crc[12];
103
104 __be32 c_code_start;
105 __be16 gen_ver;
106 __be16 c_code_len;
107
108 __be32 vr_start;
109 __be16 rsv0;
110 __be16 vr_len;
111
112 __be32 ft_start;
113 __be16 vr_version;
114 __be16 ft_len;
115
116 __be16 core_ver;
117 __be16 boot_ver;
118
119 __be16 release_ver;
120 __be16 custom_ver;
121
122 u8 factory_id;
123 u8 panel_type;
124 u8 model_name[6];
125
126 __be16 extra_option;
127 __be16 product_code;
128
129 __be16 vendor_id;
130 __be16 product_id;
131 };
132
133 struct pgm_packet {
134 struct {
135 u8 unused[3];
136 u8 len;
137 __be32 addr;
138 } header;
139 __be32 payload[HIDEEP_NVM_PAGE_SIZE / sizeof(__be32)];
140 };
141
142 #define HIDEEP_XFER_BUF_SIZE sizeof(struct pgm_packet)
143
144 struct hideep_ts {
145 struct i2c_client *client;
146 struct input_dev *input_dev;
147 struct regmap *reg;
148
149 struct touchscreen_properties prop;
150
151 struct gpio_desc *reset_gpio;
152
153 struct regulator *vcc_vdd;
154 struct regulator *vcc_vid;
155
156 struct mutex dev_mutex;
157
158 u32 tch_count;
159 u32 lpm_count;
160
161 /*
162 * Data buffer to read packet from the device (contacts and key
163 * states). We align it on double-word boundary to keep word-sized
164 * fields in contact data and double-word-sized fields in program
165 * packet aligned.
166 */
167 u8 xfer_buf[HIDEEP_XFER_BUF_SIZE] __aligned(4);
168
169 int key_num;
170 u32 key_codes[HIDEEP_KEY_MAX];
171
172 struct dwz_info dwz_info;
173
174 unsigned int fw_size;
175 u32 nvm_mask;
176 };
177
178 static int hideep_pgm_w_mem(struct hideep_ts *ts, u32 addr,
179 const __be32 *data, size_t count)
180 {
181 struct pgm_packet *packet = (void *)ts->xfer_buf;
182 size_t len = count * sizeof(*data);
183 struct i2c_msg msg = {
184 .addr = ts->client->addr,
185 .len = len + sizeof(packet->header.len) +
186 sizeof(packet->header.addr),
187 .buf = &packet->header.len,
188 };
189 int ret;
190
191 if (len > HIDEEP_NVM_PAGE_SIZE)
192 return -EINVAL;
193
194 packet->header.len = 0x80 | (count - 1);
195 packet->header.addr = cpu_to_be32(addr);
196 memcpy(packet->payload, data, len);
197
198 ret = i2c_transfer(ts->client->adapter, &msg, 1);
199 if (ret != 1)
200 return ret < 0 ? ret : -EIO;
201
202 return 0;
203 }
204
205 static int hideep_pgm_r_mem(struct hideep_ts *ts, u32 addr,
206 __be32 *data, size_t count)
207 {
208 struct pgm_packet *packet = (void *)ts->xfer_buf;
209 size_t len = count * sizeof(*data);
210 struct i2c_msg msg[] = {
211 {
212 .addr = ts->client->addr,
213 .len = sizeof(packet->header.len) +
214 sizeof(packet->header.addr),
215 .buf = &packet->header.len,
216 },
217 {
218 .addr = ts->client->addr,
219 .flags = I2C_M_RD,
220 .len = len,
221 .buf = (u8 *)data,
222 },
223 };
224 int ret;
225
226 if (len > HIDEEP_NVM_PAGE_SIZE)
227 return -EINVAL;
228
229 packet->header.len = count - 1;
230 packet->header.addr = cpu_to_be32(addr);
231
232 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
233 if (ret != ARRAY_SIZE(msg))
234 return ret < 0 ? ret : -EIO;
235
236 return 0;
237 }
238
239 static int hideep_pgm_r_reg(struct hideep_ts *ts, u32 addr, u32 *val)
240 {
241 __be32 data;
242 int error;
243
244 error = hideep_pgm_r_mem(ts, addr, &data, 1);
245 if (error) {
246 dev_err(&ts->client->dev,
247 "read of register %#08x failed: %d\n",
248 addr, error);
249 return error;
250 }
251
252 *val = be32_to_cpu(data);
253 return 0;
254 }
255
256 static int hideep_pgm_w_reg(struct hideep_ts *ts, u32 addr, u32 val)
257 {
258 __be32 data = cpu_to_be32(val);
259 int error;
260
261 error = hideep_pgm_w_mem(ts, addr, &data, 1);
262 if (error) {
263 dev_err(&ts->client->dev,
264 "write to register %#08x (%#08x) failed: %d\n",
265 addr, val, error);
266 return error;
267 }
268
269 return 0;
270 }
271
272 #define SW_RESET_IN_PGM(clk) \
273 { \
274 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CNT, (clk)); \
275 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x03); \
276 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x01); \
277 }
278
279 #define SET_FLASH_PIO(ce) \
280 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CON, \
281 0x01 | ((ce) << 1))
282
283 #define SET_PIO_SIG(x, y) \
284 hideep_pgm_w_reg(ts, HIDEEP_FLASH_PIO_SIG + (x), (y))
285
286 #define SET_FLASH_HWCONTROL() \
287 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CON, 0x00)
288
289 #define NVM_W_SFR(x, y) \
290 { \
291 SET_FLASH_PIO(1); \
292 SET_PIO_SIG(x, y); \
293 SET_FLASH_PIO(0); \
294 }
295
296 static void hideep_pgm_set(struct hideep_ts *ts)
297 {
298 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x00);
299 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_SPC_CON, 0x00);
300 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_CLK_ENA, 0xFF);
301 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_CLK_CON, 0x01);
302 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_PWR_CON, 0x01);
303 hideep_pgm_w_reg(ts, HIDEEP_FLASH_TIM, 0x03);
304 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CACHE_CFG, 0x00);
305 }
306
307 static int hideep_pgm_get_pattern(struct hideep_ts *ts, u32 *pattern)
308 {
309 u16 p1 = 0xAF39;
310 u16 p2 = 0xDF9D;
311 int error;
312
313 error = regmap_bulk_write(ts->reg, p1, &p2, 1);
314 if (error) {
315 dev_err(&ts->client->dev,
316 "%s: regmap_bulk_write() failed with %d\n",
317 __func__, error);
318 return error;
319 }
320
321 usleep_range(1000, 1100);
322
323 /* flush invalid Tx load register */
324 error = hideep_pgm_w_reg(ts, HIDEEP_ESI_TX_INVALID, 0x01);
325 if (error)
326 return error;
327
328 error = hideep_pgm_r_reg(ts, HIDEEP_SYSCON_PGM_ID, pattern);
329 if (error)
330 return error;
331
332 return 0;
333 }
334
335 static int hideep_enter_pgm(struct hideep_ts *ts)
336 {
337 int retry_count = 10;
338 u32 pattern;
339 int error;
340
341 while (retry_count--) {
342 error = hideep_pgm_get_pattern(ts, &pattern);
343 if (error) {
344 dev_err(&ts->client->dev,
345 "hideep_pgm_get_pattern failed: %d\n", error);
346 } else if (pattern != 0x39AF9DDF) {
347 dev_err(&ts->client->dev, "%s: bad pattern: %#08x\n",
348 __func__, pattern);
349 } else {
350 dev_dbg(&ts->client->dev, "found magic code");
351
352 hideep_pgm_set(ts);
353 usleep_range(1000, 1100);
354
355 return 0;
356 }
357 }
358
359 dev_err(&ts->client->dev, "failed to enter pgm mode\n");
360 SW_RESET_IN_PGM(1000);
361 return -EIO;
362 }
363
364 static void hideep_nvm_unlock(struct hideep_ts *ts)
365 {
366 u32 unmask_code;
367
368 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE);
369 hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
370 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
371
372 /* make it unprotected code */
373 unmask_code &= ~HIDEEP_PROT_MODE;
374
375 /* compare unmask code */
376 if (unmask_code != ts->nvm_mask)
377 dev_warn(&ts->client->dev,
378 "read mask code different %#08x vs %#08x",
379 unmask_code, ts->nvm_mask);
380
381 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_WPAGE);
382 SET_FLASH_PIO(0);
383
384 NVM_W_SFR(HIDEEP_NVM_MASK_OFS, ts->nvm_mask);
385 SET_FLASH_HWCONTROL();
386 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
387 }
388
389 static int hideep_check_status(struct hideep_ts *ts)
390 {
391 int time_out = 100;
392 int status;
393 int error;
394
395 while (time_out--) {
396 error = hideep_pgm_r_reg(ts, HIDEEP_FLASH_STA, &status);
397 if (!error && status)
398 return 0;
399
400 usleep_range(1000, 1100);
401 }
402
403 return -ETIMEDOUT;
404 }
405
406 static int hideep_program_page(struct hideep_ts *ts, u32 addr,
407 const __be32 *ucode, size_t xfer_count)
408 {
409 u32 val;
410 int error;
411
412 error = hideep_check_status(ts);
413 if (error)
414 return -EBUSY;
415
416 addr &= ~(HIDEEP_NVM_PAGE_SIZE - 1);
417
418 SET_FLASH_PIO(0);
419 SET_FLASH_PIO(1);
420
421 /* erase page */
422 SET_PIO_SIG(HIDEEP_PERASE | addr, 0xFFFFFFFF);
423
424 SET_FLASH_PIO(0);
425
426 error = hideep_check_status(ts);
427 if (error)
428 return -EBUSY;
429
430 /* write page */
431 SET_FLASH_PIO(1);
432
433 val = be32_to_cpu(ucode[0]);
434 SET_PIO_SIG(HIDEEP_WRONLY | addr, val);
435
436 hideep_pgm_w_mem(ts, HIDEEP_FLASH_PIO_SIG | HIDEEP_WRONLY,
437 ucode, xfer_count);
438
439 val = be32_to_cpu(ucode[xfer_count - 1]);
440 SET_PIO_SIG(124, val);
441
442 SET_FLASH_PIO(0);
443
444 usleep_range(1000, 1100);
445
446 error = hideep_check_status(ts);
447 if (error)
448 return -EBUSY;
449
450 SET_FLASH_HWCONTROL();
451
452 return 0;
453 }
454
455 static int hideep_program_nvm(struct hideep_ts *ts,
456 const __be32 *ucode, size_t ucode_len)
457 {
458 struct pgm_packet *packet_r = (void *)ts->xfer_buf;
459 __be32 *current_ucode = packet_r->payload;
460 size_t xfer_len;
461 size_t xfer_count;
462 u32 addr = 0;
463 int error;
464
465 hideep_nvm_unlock(ts);
466
467 while (ucode_len > 0) {
468 xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
469 xfer_count = xfer_len / sizeof(*ucode);
470
471 error = hideep_pgm_r_mem(ts, 0x00000000 + addr,
472 current_ucode, xfer_count);
473 if (error) {
474 dev_err(&ts->client->dev,
475 "%s: failed to read page at offset %#08x: %d\n",
476 __func__, addr, error);
477 return error;
478 }
479
480 /* See if the page needs updating */
481 if (memcmp(ucode, current_ucode, xfer_len)) {
482 error = hideep_program_page(ts, addr,
483 ucode, xfer_count);
484 if (error) {
485 dev_err(&ts->client->dev,
486 "%s: iwrite failure @%#08x: %d\n",
487 __func__, addr, error);
488 return error;
489 }
490
491 usleep_range(1000, 1100);
492 }
493
494 ucode += xfer_count;
495 addr += xfer_len;
496 ucode_len -= xfer_len;
497 }
498
499 return 0;
500 }
501
502 static int hideep_verify_nvm(struct hideep_ts *ts,
503 const __be32 *ucode, size_t ucode_len)
504 {
505 struct pgm_packet *packet_r = (void *)ts->xfer_buf;
506 __be32 *current_ucode = packet_r->payload;
507 size_t xfer_len;
508 size_t xfer_count;
509 u32 addr = 0;
510 int i;
511 int error;
512
513 while (ucode_len > 0) {
514 xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
515 xfer_count = xfer_len / sizeof(*ucode);
516
517 error = hideep_pgm_r_mem(ts, 0x00000000 + addr,
518 current_ucode, xfer_count);
519 if (error) {
520 dev_err(&ts->client->dev,
521 "%s: failed to read page at offset %#08x: %d\n",
522 __func__, addr, error);
523 return error;
524 }
525
526 if (memcmp(ucode, current_ucode, xfer_len)) {
527 const u8 *ucode_bytes = (const u8 *)ucode;
528 const u8 *current_bytes = (const u8 *)current_ucode;
529
530 for (i = 0; i < xfer_len; i++)
531 if (ucode_bytes[i] != current_bytes[i])
532 dev_err(&ts->client->dev,
533 "%s: mismatch @%#08x: (%#02x vs %#02x)\n",
534 __func__, addr + i,
535 ucode_bytes[i],
536 current_bytes[i]);
537
538 return -EIO;
539 }
540
541 ucode += xfer_count;
542 addr += xfer_len;
543 ucode_len -= xfer_len;
544 }
545
546 return 0;
547 }
548
549 static int hideep_load_dwz(struct hideep_ts *ts)
550 {
551 u16 product_code;
552 int error;
553
554 error = hideep_enter_pgm(ts);
555 if (error)
556 return error;
557
558 msleep(50);
559
560 error = hideep_pgm_r_mem(ts, HIDEEP_DWZ_INFO,
561 (void *)&ts->dwz_info,
562 sizeof(ts->dwz_info) / sizeof(__be32));
563
564 SW_RESET_IN_PGM(10);
565 msleep(50);
566
567 if (error) {
568 dev_err(&ts->client->dev,
569 "failed to fetch DWZ data: %d\n", error);
570 return error;
571 }
572
573 product_code = be16_to_cpu(ts->dwz_info.product_code);
574
575 switch (product_code & 0xF0) {
576 case 0x40:
577 dev_dbg(&ts->client->dev, "used crimson IC");
578 ts->fw_size = 1024 * 48;
579 ts->nvm_mask = 0x00310000;
580 break;
581 case 0x60:
582 dev_dbg(&ts->client->dev, "used lime IC");
583 ts->fw_size = 1024 * 64;
584 ts->nvm_mask = 0x0030027B;
585 break;
586 default:
587 dev_err(&ts->client->dev, "product code is wrong: %#04x",
588 product_code);
589 return -EINVAL;
590 }
591
592 dev_dbg(&ts->client->dev, "firmware release version: %#04x",
593 be16_to_cpu(ts->dwz_info.release_ver));
594
595 return 0;
596 }
597
598 static int hideep_flash_firmware(struct hideep_ts *ts,
599 const __be32 *ucode, size_t ucode_len)
600 {
601 int retry_cnt = 3;
602 int error;
603
604 while (retry_cnt--) {
605 error = hideep_program_nvm(ts, ucode, ucode_len);
606 if (!error) {
607 error = hideep_verify_nvm(ts, ucode, ucode_len);
608 if (!error)
609 return 0;
610 }
611 }
612
613 return error;
614 }
615
616 static int hideep_update_firmware(struct hideep_ts *ts,
617 const __be32 *ucode, size_t ucode_len)
618 {
619 int error, error2;
620
621 dev_dbg(&ts->client->dev, "starting firmware update");
622
623 /* enter program mode */
624 error = hideep_enter_pgm(ts);
625 if (error)
626 return error;
627
628 error = hideep_flash_firmware(ts, ucode, ucode_len);
629 if (error)
630 dev_err(&ts->client->dev,
631 "firmware update failed: %d\n", error);
632 else
633 dev_dbg(&ts->client->dev, "firmware updated successfully\n");
634
635 SW_RESET_IN_PGM(1000);
636
637 error2 = hideep_load_dwz(ts);
638 if (error2)
639 dev_err(&ts->client->dev,
640 "failed to load dwz after firmware update: %d\n",
641 error2);
642
643 return error ?: error2;
644 }
645
646 static int hideep_power_on(struct hideep_ts *ts)
647 {
648 int error = 0;
649
650 error = regulator_enable(ts->vcc_vdd);
651 if (error)
652 dev_err(&ts->client->dev,
653 "failed to enable 'vdd' regulator: %d", error);
654
655 usleep_range(999, 1000);
656
657 error = regulator_enable(ts->vcc_vid);
658 if (error)
659 dev_err(&ts->client->dev,
660 "failed to enable 'vcc_vid' regulator: %d",
661 error);
662
663 msleep(30);
664
665 if (ts->reset_gpio) {
666 gpiod_set_value_cansleep(ts->reset_gpio, 0);
667 } else {
668 error = regmap_write(ts->reg, HIDEEP_RESET_CMD, 0x01);
669 if (error)
670 dev_err(&ts->client->dev,
671 "failed to send 'reset' command: %d\n", error);
672 }
673
674 msleep(50);
675
676 return error;
677 }
678
679 static void hideep_power_off(void *data)
680 {
681 struct hideep_ts *ts = data;
682
683 if (ts->reset_gpio)
684 gpiod_set_value(ts->reset_gpio, 1);
685
686 regulator_disable(ts->vcc_vid);
687 regulator_disable(ts->vcc_vdd);
688 }
689
690 #define __GET_MT_TOOL_TYPE(type) ((type) == 0x01 ? MT_TOOL_FINGER : MT_TOOL_PEN)
691
692 static void hideep_report_slot(struct input_dev *input,
693 const struct hideep_event *event)
694 {
695 input_mt_slot(input, event->index & 0x0f);
696 input_mt_report_slot_state(input,
697 __GET_MT_TOOL_TYPE(event->type),
698 !(event->flag & HIDEEP_MT_RELEASED));
699 if (!(event->flag & HIDEEP_MT_RELEASED)) {
700 input_report_abs(input, ABS_MT_POSITION_X,
701 le16_to_cpup(&event->x));
702 input_report_abs(input, ABS_MT_POSITION_Y,
703 le16_to_cpup(&event->y));
704 input_report_abs(input, ABS_MT_PRESSURE,
705 le16_to_cpup(&event->z));
706 input_report_abs(input, ABS_MT_TOUCH_MAJOR, event->w);
707 }
708 }
709
710 static void hideep_parse_and_report(struct hideep_ts *ts)
711 {
712 const struct hideep_event *events =
713 (void *)&ts->xfer_buf[HIDEEP_TOUCH_EVENT_INDEX];
714 const u8 *keys = &ts->xfer_buf[HIDEEP_KEY_EVENT_INDEX];
715 int touch_count = ts->xfer_buf[0];
716 int key_count = ts->xfer_buf[1] & 0x0f;
717 int lpm_count = ts->xfer_buf[1] & 0xf0;
718 int i;
719
720 /* get touch event count */
721 dev_dbg(&ts->client->dev, "mt = %d, key = %d, lpm = %02x",
722 touch_count, key_count, lpm_count);
723
724 touch_count = min(touch_count, HIDEEP_MT_MAX);
725 for (i = 0; i < touch_count; i++)
726 hideep_report_slot(ts->input_dev, events + i);
727
728 key_count = min(key_count, HIDEEP_KEY_MAX);
729 for (i = 0; i < key_count; i++) {
730 u8 key_data = keys[i * 2];
731
732 input_report_key(ts->input_dev,
733 ts->key_codes[key_data & HIDEEP_KEY_IDX_MASK],
734 key_data & HIDEEP_KEY_PRESSED_MASK);
735 }
736
737 input_mt_sync_frame(ts->input_dev);
738 input_sync(ts->input_dev);
739 }
740
741 static irqreturn_t hideep_irq(int irq, void *handle)
742 {
743 struct hideep_ts *ts = handle;
744 int error;
745
746 BUILD_BUG_ON(HIDEEP_MAX_EVENT > HIDEEP_XFER_BUF_SIZE);
747
748 error = regmap_bulk_read(ts->reg, HIDEEP_EVENT_ADDR,
749 ts->xfer_buf, HIDEEP_MAX_EVENT / 2);
750 if (error) {
751 dev_err(&ts->client->dev, "failed to read events: %d\n", error);
752 goto out;
753 }
754
755 hideep_parse_and_report(ts);
756
757 out:
758 return IRQ_HANDLED;
759 }
760
761 static int hideep_get_axis_info(struct hideep_ts *ts)
762 {
763 __le16 val[2];
764 int error;
765
766 error = regmap_bulk_read(ts->reg, 0x28, val, ARRAY_SIZE(val));
767 if (error)
768 return error;
769
770 ts->prop.max_x = le16_to_cpup(val);
771 ts->prop.max_y = le16_to_cpup(val + 1);
772
773 dev_dbg(&ts->client->dev, "X: %d, Y: %d",
774 ts->prop.max_x, ts->prop.max_y);
775
776 return 0;
777 }
778
779 static int hideep_init_input(struct hideep_ts *ts)
780 {
781 struct device *dev = &ts->client->dev;
782 int i;
783 int error;
784
785 ts->input_dev = devm_input_allocate_device(dev);
786 if (!ts->input_dev) {
787 dev_err(dev, "failed to allocate input device\n");
788 return -ENOMEM;
789 }
790
791 ts->input_dev->name = HIDEEP_TS_NAME;
792 ts->input_dev->id.bustype = BUS_I2C;
793 input_set_drvdata(ts->input_dev, ts);
794
795 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
796 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
797 input_set_abs_params(ts->input_dev, ABS_MT_PRESSURE, 0, 65535, 0, 0);
798 input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
799 input_set_abs_params(ts->input_dev, ABS_MT_TOOL_TYPE,
800 0, MT_TOOL_MAX, 0, 0);
801 touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
802
803 if (ts->prop.max_x == 0 || ts->prop.max_y == 0) {
804 error = hideep_get_axis_info(ts);
805 if (error)
806 return error;
807 }
808
809 error = input_mt_init_slots(ts->input_dev, HIDEEP_MT_MAX,
810 INPUT_MT_DIRECT);
811 if (error)
812 return error;
813
814 ts->key_num = device_property_count_u32(dev, "linux,keycodes");
815 if (ts->key_num > HIDEEP_KEY_MAX) {
816 dev_err(dev, "too many keys defined: %d\n",
817 ts->key_num);
818 return -EINVAL;
819 }
820
821 if (ts->key_num <= 0) {
822 dev_dbg(dev,
823 "missing or malformed 'linux,keycodes' property\n");
824 } else {
825 error = device_property_read_u32_array(dev, "linux,keycodes",
826 ts->key_codes,
827 ts->key_num);
828 if (error) {
829 dev_dbg(dev, "failed to read keymap: %d", error);
830 return error;
831 }
832
833 if (ts->key_num) {
834 ts->input_dev->keycode = ts->key_codes;
835 ts->input_dev->keycodesize = sizeof(ts->key_codes[0]);
836 ts->input_dev->keycodemax = ts->key_num;
837
838 for (i = 0; i < ts->key_num; i++)
839 input_set_capability(ts->input_dev, EV_KEY,
840 ts->key_codes[i]);
841 }
842 }
843
844 error = input_register_device(ts->input_dev);
845 if (error) {
846 dev_err(dev, "failed to register input device: %d", error);
847 return error;
848 }
849
850 return 0;
851 }
852
853 static ssize_t hideep_update_fw(struct device *dev,
854 struct device_attribute *attr,
855 const char *buf, size_t count)
856 {
857 struct i2c_client *client = to_i2c_client(dev);
858 struct hideep_ts *ts = i2c_get_clientdata(client);
859 const struct firmware *fw_entry;
860 char *fw_name;
861 int mode;
862 int error;
863
864 error = kstrtoint(buf, 0, &mode);
865 if (error)
866 return error;
867
868 fw_name = kasprintf(GFP_KERNEL, "hideep_ts_%04x.bin",
869 be16_to_cpu(ts->dwz_info.product_id));
870 if (!fw_name)
871 return -ENOMEM;
872
873 error = request_firmware(&fw_entry, fw_name, dev);
874 if (error) {
875 dev_err(dev, "failed to request firmware %s: %d",
876 fw_name, error);
877 goto out_free_fw_name;
878 }
879
880 if (fw_entry->size % sizeof(__be32)) {
881 dev_err(dev, "invalid firmware size %zu\n", fw_entry->size);
882 error = -EINVAL;
883 goto out_release_fw;
884 }
885
886 if (fw_entry->size > ts->fw_size) {
887 dev_err(dev, "fw size (%zu) is too big (memory size %d)\n",
888 fw_entry->size, ts->fw_size);
889 error = -EFBIG;
890 goto out_release_fw;
891 }
892
893 mutex_lock(&ts->dev_mutex);
894 disable_irq(client->irq);
895
896 error = hideep_update_firmware(ts, (const __be32 *)fw_entry->data,
897 fw_entry->size);
898
899 enable_irq(client->irq);
900 mutex_unlock(&ts->dev_mutex);
901
902 out_release_fw:
903 release_firmware(fw_entry);
904 out_free_fw_name:
905 kfree(fw_name);
906
907 return error ?: count;
908 }
909
910 static ssize_t hideep_fw_version_show(struct device *dev,
911 struct device_attribute *attr, char *buf)
912 {
913 struct i2c_client *client = to_i2c_client(dev);
914 struct hideep_ts *ts = i2c_get_clientdata(client);
915 ssize_t len;
916
917 mutex_lock(&ts->dev_mutex);
918 len = scnprintf(buf, PAGE_SIZE, "%04x\n",
919 be16_to_cpu(ts->dwz_info.release_ver));
920 mutex_unlock(&ts->dev_mutex);
921
922 return len;
923 }
924
925 static ssize_t hideep_product_id_show(struct device *dev,
926 struct device_attribute *attr, char *buf)
927 {
928 struct i2c_client *client = to_i2c_client(dev);
929 struct hideep_ts *ts = i2c_get_clientdata(client);
930 ssize_t len;
931
932 mutex_lock(&ts->dev_mutex);
933 len = scnprintf(buf, PAGE_SIZE, "%04x\n",
934 be16_to_cpu(ts->dwz_info.product_id));
935 mutex_unlock(&ts->dev_mutex);
936
937 return len;
938 }
939
940 static DEVICE_ATTR(version, 0664, hideep_fw_version_show, NULL);
941 static DEVICE_ATTR(product_id, 0664, hideep_product_id_show, NULL);
942 static DEVICE_ATTR(update_fw, 0664, NULL, hideep_update_fw);
943
944 static struct attribute *hideep_ts_sysfs_entries[] = {
945 &dev_attr_version.attr,
946 &dev_attr_product_id.attr,
947 &dev_attr_update_fw.attr,
948 NULL,
949 };
950
951 static const struct attribute_group hideep_ts_attr_group = {
952 .attrs = hideep_ts_sysfs_entries,
953 };
954
955 static int __maybe_unused hideep_suspend(struct device *dev)
956 {
957 struct i2c_client *client = to_i2c_client(dev);
958 struct hideep_ts *ts = i2c_get_clientdata(client);
959
960 disable_irq(client->irq);
961 hideep_power_off(ts);
962
963 return 0;
964 }
965
966 static int __maybe_unused hideep_resume(struct device *dev)
967 {
968 struct i2c_client *client = to_i2c_client(dev);
969 struct hideep_ts *ts = i2c_get_clientdata(client);
970 int error;
971
972 error = hideep_power_on(ts);
973 if (error) {
974 dev_err(&client->dev, "power on failed");
975 return error;
976 }
977
978 enable_irq(client->irq);
979
980 return 0;
981 }
982
983 static SIMPLE_DEV_PM_OPS(hideep_pm_ops, hideep_suspend, hideep_resume);
984
985 static const struct regmap_config hideep_regmap_config = {
986 .reg_bits = 16,
987 .reg_format_endian = REGMAP_ENDIAN_LITTLE,
988 .val_bits = 16,
989 .val_format_endian = REGMAP_ENDIAN_LITTLE,
990 .max_register = 0xffff,
991 };
992
993 static int hideep_probe(struct i2c_client *client,
994 const struct i2c_device_id *id)
995 {
996 struct hideep_ts *ts;
997 int error;
998
999 /* check i2c bus */
1000 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1001 dev_err(&client->dev, "check i2c device error");
1002 return -ENODEV;
1003 }
1004
1005 if (client->irq <= 0) {
1006 dev_err(&client->dev, "missing irq: %d\n", client->irq);
1007 return -EINVAL;
1008 }
1009
1010 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1011 if (!ts)
1012 return -ENOMEM;
1013
1014 ts->client = client;
1015 i2c_set_clientdata(client, ts);
1016 mutex_init(&ts->dev_mutex);
1017
1018 ts->reg = devm_regmap_init_i2c(client, &hideep_regmap_config);
1019 if (IS_ERR(ts->reg)) {
1020 error = PTR_ERR(ts->reg);
1021 dev_err(&client->dev,
1022 "failed to initialize regmap: %d\n", error);
1023 return error;
1024 }
1025
1026 ts->vcc_vdd = devm_regulator_get(&client->dev, "vdd");
1027 if (IS_ERR(ts->vcc_vdd))
1028 return PTR_ERR(ts->vcc_vdd);
1029
1030 ts->vcc_vid = devm_regulator_get(&client->dev, "vid");
1031 if (IS_ERR(ts->vcc_vid))
1032 return PTR_ERR(ts->vcc_vid);
1033
1034 ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
1035 "reset", GPIOD_OUT_HIGH);
1036 if (IS_ERR(ts->reset_gpio))
1037 return PTR_ERR(ts->reset_gpio);
1038
1039 error = hideep_power_on(ts);
1040 if (error) {
1041 dev_err(&client->dev, "power on failed: %d\n", error);
1042 return error;
1043 }
1044
1045 error = devm_add_action_or_reset(&client->dev, hideep_power_off, ts);
1046 if (error)
1047 return error;
1048
1049 error = hideep_load_dwz(ts);
1050 if (error) {
1051 dev_err(&client->dev, "failed to load dwz: %d", error);
1052 return error;
1053 }
1054
1055 error = hideep_init_input(ts);
1056 if (error)
1057 return error;
1058
1059 error = devm_request_threaded_irq(&client->dev, client->irq,
1060 NULL, hideep_irq, IRQF_ONESHOT,
1061 client->name, ts);
1062 if (error) {
1063 dev_err(&client->dev, "failed to request irq %d: %d\n",
1064 client->irq, error);
1065 return error;
1066 }
1067
1068 error = devm_device_add_group(&client->dev, &hideep_ts_attr_group);
1069 if (error) {
1070 dev_err(&client->dev,
1071 "failed to add sysfs attributes: %d\n", error);
1072 return error;
1073 }
1074
1075 return 0;
1076 }
1077
1078 static const struct i2c_device_id hideep_i2c_id[] = {
1079 { HIDEEP_I2C_NAME, 0 },
1080 { }
1081 };
1082 MODULE_DEVICE_TABLE(i2c, hideep_i2c_id);
1083
1084 #ifdef CONFIG_ACPI
1085 static const struct acpi_device_id hideep_acpi_id[] = {
1086 { "HIDP0001", 0 },
1087 { }
1088 };
1089 MODULE_DEVICE_TABLE(acpi, hideep_acpi_id);
1090 #endif
1091
1092 #ifdef CONFIG_OF
1093 static const struct of_device_id hideep_match_table[] = {
1094 { .compatible = "hideep,hideep-ts" },
1095 { }
1096 };
1097 MODULE_DEVICE_TABLE(of, hideep_match_table);
1098 #endif
1099
1100 static struct i2c_driver hideep_driver = {
1101 .driver = {
1102 .name = HIDEEP_I2C_NAME,
1103 .of_match_table = of_match_ptr(hideep_match_table),
1104 .acpi_match_table = ACPI_PTR(hideep_acpi_id),
1105 .pm = &hideep_pm_ops,
1106 },
1107 .id_table = hideep_i2c_id,
1108 .probe = hideep_probe,
1109 };
1110
1111 module_i2c_driver(hideep_driver);
1112
1113 MODULE_DESCRIPTION("Driver for HiDeep Touchscreen Controller");
1114 MODULE_AUTHOR("anthony.kim@hideep.com");
1115 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support