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1/*
2 * Copyright (C) 2012-2017 Hideep, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foudation.
7 */
8
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/firmware.h>
12#include <linux/delay.h>
13#include <linux/gpio/consumer.h>
14#include <linux/i2c.h>
15#include <linux/acpi.h>
16#include <linux/interrupt.h>
17#include <linux/regmap.h>
18#include <linux/sysfs.h>
19#include <linux/input.h>
20#include <linux/input/mt.h>
21#include <linux/input/touchscreen.h>
22#include <linux/regulator/consumer.h>
23#include <asm/unaligned.h>
24
25#define HIDEEP_TS_NAME "HiDeep Touchscreen"
26#define HIDEEP_I2C_NAME "hideep_ts"
27
28#define HIDEEP_MT_MAX 10
29#define HIDEEP_KEY_MAX 3
30
31/* count(2) + touch data(100) + key data(6) */
32#define HIDEEP_MAX_EVENT 108UL
33
34#define HIDEEP_TOUCH_EVENT_INDEX 2
35#define HIDEEP_KEY_EVENT_INDEX 102
36
37/* Touch & key event */
38#define HIDEEP_EVENT_ADDR 0x240
39
40/* command list */
41#define HIDEEP_RESET_CMD 0x9800
42
43/* event bit */
44#define HIDEEP_MT_RELEASED BIT(4)
45#define HIDEEP_KEY_PRESSED BIT(7)
46#define HIDEEP_KEY_FIRST_PRESSED BIT(8)
47#define HIDEEP_KEY_PRESSED_MASK (HIDEEP_KEY_PRESSED | \
48 HIDEEP_KEY_FIRST_PRESSED)
49
50#define HIDEEP_KEY_IDX_MASK 0x0f
51
52/* For NVM */
53#define HIDEEP_YRAM_BASE 0x40000000
54#define HIDEEP_PERIPHERAL_BASE 0x50000000
55#define HIDEEP_ESI_BASE (HIDEEP_PERIPHERAL_BASE + 0x00000000)
56#define HIDEEP_FLASH_BASE (HIDEEP_PERIPHERAL_BASE + 0x01000000)
57#define HIDEEP_SYSCON_BASE (HIDEEP_PERIPHERAL_BASE + 0x02000000)
58
59#define HIDEEP_SYSCON_MOD_CON (HIDEEP_SYSCON_BASE + 0x0000)
60#define HIDEEP_SYSCON_SPC_CON (HIDEEP_SYSCON_BASE + 0x0004)
61#define HIDEEP_SYSCON_CLK_CON (HIDEEP_SYSCON_BASE + 0x0008)
62#define HIDEEP_SYSCON_CLK_ENA (HIDEEP_SYSCON_BASE + 0x000C)
63#define HIDEEP_SYSCON_RST_CON (HIDEEP_SYSCON_BASE + 0x0010)
64#define HIDEEP_SYSCON_WDT_CON (HIDEEP_SYSCON_BASE + 0x0014)
65#define HIDEEP_SYSCON_WDT_CNT (HIDEEP_SYSCON_BASE + 0x0018)
66#define HIDEEP_SYSCON_PWR_CON (HIDEEP_SYSCON_BASE + 0x0020)
67#define HIDEEP_SYSCON_PGM_ID (HIDEEP_SYSCON_BASE + 0x00F4)
68
69#define HIDEEP_FLASH_CON (HIDEEP_FLASH_BASE + 0x0000)
70#define HIDEEP_FLASH_STA (HIDEEP_FLASH_BASE + 0x0004)
71#define HIDEEP_FLASH_CFG (HIDEEP_FLASH_BASE + 0x0008)
72#define HIDEEP_FLASH_TIM (HIDEEP_FLASH_BASE + 0x000C)
73#define HIDEEP_FLASH_CACHE_CFG (HIDEEP_FLASH_BASE + 0x0010)
74#define HIDEEP_FLASH_PIO_SIG (HIDEEP_FLASH_BASE + 0x400000)
75
76#define HIDEEP_ESI_TX_INVALID (HIDEEP_ESI_BASE + 0x0008)
77
78#define HIDEEP_PERASE 0x00040000
79#define HIDEEP_WRONLY 0x00100000
80
81#define HIDEEP_NVM_MASK_OFS 0x0000000C
82#define HIDEEP_NVM_DEFAULT_PAGE 0
83#define HIDEEP_NVM_SFR_WPAGE 1
84#define HIDEEP_NVM_SFR_RPAGE 2
85
86#define HIDEEP_PIO_SIG 0x00400000
87#define HIDEEP_PROT_MODE 0x03400000
88
89#define HIDEEP_NVM_PAGE_SIZE 128
90
91#define HIDEEP_DWZ_INFO 0x000002C0
92
93struct hideep_event {
94 __le16 x;
95 __le16 y;
96 __le16 z;
97 u8 w;
98 u8 flag;
99 u8 type;
100 u8 index;
101};
102
103struct dwz_info {
104 __be32 code_start;
105 u8 code_crc[12];
106
107 __be32 c_code_start;
108 __be16 gen_ver;
109 __be16 c_code_len;
110
111 __be32 vr_start;
112 __be16 rsv0;
113 __be16 vr_len;
114
115 __be32 ft_start;
116 __be16 vr_version;
117 __be16 ft_len;
118
119 __be16 core_ver;
120 __be16 boot_ver;
121
122 __be16 release_ver;
123 __be16 custom_ver;
124
125 u8 factory_id;
126 u8 panel_type;
127 u8 model_name[6];
128
129 __be16 extra_option;
130 __be16 product_code;
131
132 __be16 vendor_id;
133 __be16 product_id;
134};
135
136struct pgm_packet {
137 struct {
138 u8 unused[3];
139 u8 len;
140 __be32 addr;
141 } header;
142 __be32 payload[HIDEEP_NVM_PAGE_SIZE / sizeof(__be32)];
143};
144
145#define HIDEEP_XFER_BUF_SIZE sizeof(struct pgm_packet)
146
147struct hideep_ts {
148 struct i2c_client *client;
149 struct input_dev *input_dev;
150 struct regmap *reg;
151
152 struct touchscreen_properties prop;
153
154 struct gpio_desc *reset_gpio;
155
156 struct regulator *vcc_vdd;
157 struct regulator *vcc_vid;
158
159 struct mutex dev_mutex;
160
161 u32 tch_count;
162 u32 lpm_count;
163
164 /*
165 * Data buffer to read packet from the device (contacts and key
166 * states). We align it on double-word boundary to keep word-sized
167 * fields in contact data and double-word-sized fields in program
168 * packet aligned.
169 */
170 u8 xfer_buf[HIDEEP_XFER_BUF_SIZE] __aligned(4);
171
172 int key_num;
173 u32 key_codes[HIDEEP_KEY_MAX];
174
175 struct dwz_info dwz_info;
176
177 unsigned int fw_size;
178 u32 nvm_mask;
179};
180
181static int hideep_pgm_w_mem(struct hideep_ts *ts, u32 addr,
182 const __be32 *data, size_t count)
183{
184 struct pgm_packet *packet = (void *)ts->xfer_buf;
185 size_t len = count * sizeof(*data);
186 struct i2c_msg msg = {
187 .addr = ts->client->addr,
188 .len = len + sizeof(packet->header.len) +
189 sizeof(packet->header.addr),
190 .buf = &packet->header.len,
191 };
192 int ret;
193
194 if (len > HIDEEP_NVM_PAGE_SIZE)
195 return -EINVAL;
196
197 packet->header.len = 0x80 | (count - 1);
198 packet->header.addr = cpu_to_be32(addr);
199 memcpy(packet->payload, data, len);
200
201 ret = i2c_transfer(ts->client->adapter, &msg, 1);
202 if (ret != 1)
203 return ret < 0 ? ret : -EIO;
204
205 return 0;
206}
207
208static int hideep_pgm_r_mem(struct hideep_ts *ts, u32 addr,
209 __be32 *data, size_t count)
210{
211 struct pgm_packet *packet = (void *)ts->xfer_buf;
212 size_t len = count * sizeof(*data);
213 struct i2c_msg msg[] = {
214 {
215 .addr = ts->client->addr,
216 .len = sizeof(packet->header.len) +
217 sizeof(packet->header.addr),
218 .buf = &packet->header.len,
219 },
220 {
221 .addr = ts->client->addr,
222 .flags = I2C_M_RD,
223 .len = len,
224 .buf = (u8 *)data,
225 },
226 };
227 int ret;
228
229 if (len > HIDEEP_NVM_PAGE_SIZE)
230 return -EINVAL;
231
232 packet->header.len = count - 1;
233 packet->header.addr = cpu_to_be32(addr);
234
235 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
236 if (ret != ARRAY_SIZE(msg))
237 return ret < 0 ? ret : -EIO;
238
239 return 0;
240}
241
242static int hideep_pgm_r_reg(struct hideep_ts *ts, u32 addr, u32 *val)
243{
244 __be32 data;
245 int error;
246
247 error = hideep_pgm_r_mem(ts, addr, &data, 1);
248 if (error) {
249 dev_err(&ts->client->dev,
250 "read of register %#08x failed: %d\n",
251 addr, error);
252 return error;
253 }
254
255 *val = be32_to_cpu(data);
256 return 0;
257}
258
259static int hideep_pgm_w_reg(struct hideep_ts *ts, u32 addr, u32 val)
260{
261 __be32 data = cpu_to_be32(val);
262 int error;
263
264 error = hideep_pgm_w_mem(ts, addr, &data, 1);
265 if (error) {
266 dev_err(&ts->client->dev,
267 "write to register %#08x (%#08x) failed: %d\n",
268 addr, val, error);
269 return error;
270 }
271
272 return 0;
273}
274
275#define SW_RESET_IN_PGM(clk) \
276{ \
277 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CNT, (clk)); \
278 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x03); \
279 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x01); \
280}
281
282#define SET_FLASH_PIO(ce) \
283 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CON, \
284 0x01 | ((ce) << 1))
285
286#define SET_PIO_SIG(x, y) \
287 hideep_pgm_w_reg(ts, HIDEEP_FLASH_PIO_SIG + (x), (y))
288
289#define SET_FLASH_HWCONTROL() \
290 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CON, 0x00)
291
292#define NVM_W_SFR(x, y) \
293{ \
294 SET_FLASH_PIO(1); \
295 SET_PIO_SIG(x, y); \
296 SET_FLASH_PIO(0); \
297}
298
299static void hideep_pgm_set(struct hideep_ts *ts)
300{
301 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x00);
302 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_SPC_CON, 0x00);
303 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_CLK_ENA, 0xFF);
304 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_CLK_CON, 0x01);
305 hideep_pgm_w_reg(ts, HIDEEP_SYSCON_PWR_CON, 0x01);
306 hideep_pgm_w_reg(ts, HIDEEP_FLASH_TIM, 0x03);
307 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CACHE_CFG, 0x00);
308}
309
310static int hideep_pgm_get_pattern(struct hideep_ts *ts, u32 *pattern)
311{
312 u16 p1 = 0xAF39;
313 u16 p2 = 0xDF9D;
314 int error;
315
316 error = regmap_bulk_write(ts->reg, p1, &p2, 1);
317 if (error) {
318 dev_err(&ts->client->dev,
319 "%s: regmap_bulk_write() failed with %d\n",
320 __func__, error);
321 return error;
322 }
323
324 usleep_range(1000, 1100);
325
326 /* flush invalid Tx load register */
327 error = hideep_pgm_w_reg(ts, HIDEEP_ESI_TX_INVALID, 0x01);
328 if (error)
329 return error;
330
331 error = hideep_pgm_r_reg(ts, HIDEEP_SYSCON_PGM_ID, pattern);
332 if (error)
333 return error;
334
335 return 0;
336}
337
338static int hideep_enter_pgm(struct hideep_ts *ts)
339{
340 int retry_count = 10;
341 u32 pattern;
342 int error;
343
344 while (retry_count--) {
345 error = hideep_pgm_get_pattern(ts, &pattern);
346 if (error) {
347 dev_err(&ts->client->dev,
348 "hideep_pgm_get_pattern failed: %d\n", error);
349 } else if (pattern != 0x39AF9DDF) {
350 dev_err(&ts->client->dev, "%s: bad pattern: %#08x\n",
351 __func__, pattern);
352 } else {
353 dev_dbg(&ts->client->dev, "found magic code");
354
355 hideep_pgm_set(ts);
356 usleep_range(1000, 1100);
357
358 return 0;
359 }
360 }
361
362 dev_err(&ts->client->dev, "failed to enter pgm mode\n");
363 SW_RESET_IN_PGM(1000);
364 return -EIO;
365}
366
367static void hideep_nvm_unlock(struct hideep_ts *ts)
368{
369 u32 unmask_code;
370
371 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE);
372 hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
373 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
374
375 /* make it unprotected code */
376 unmask_code &= ~HIDEEP_PROT_MODE;
377
378 /* compare unmask code */
379 if (unmask_code != ts->nvm_mask)
380 dev_warn(&ts->client->dev,
381 "read mask code different %#08x vs %#08x",
382 unmask_code, ts->nvm_mask);
383
384 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_WPAGE);
385 SET_FLASH_PIO(0);
386
387 NVM_W_SFR(HIDEEP_NVM_MASK_OFS, ts->nvm_mask);
388 SET_FLASH_HWCONTROL();
389 hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
390}
391
392static int hideep_check_status(struct hideep_ts *ts)
393{
394 int time_out = 100;
395 int status;
396 int error;
397
398 while (time_out--) {
399 error = hideep_pgm_r_reg(ts, HIDEEP_FLASH_STA, &status);
400 if (!error && status)
401 return 0;
402
403 usleep_range(1000, 1100);
404 }
405
406 return -ETIMEDOUT;
407}
408
409static int hideep_program_page(struct hideep_ts *ts, u32 addr,
410 const __be32 *ucode, size_t xfer_count)
411{
412 u32 val;
413 int error;
414
415 error = hideep_check_status(ts);
416 if (error)
417 return -EBUSY;
418
419 addr &= ~(HIDEEP_NVM_PAGE_SIZE - 1);
420
421 SET_FLASH_PIO(0);
422 SET_FLASH_PIO(1);
423
424 /* erase page */
425 SET_PIO_SIG(HIDEEP_PERASE | addr, 0xFFFFFFFF);
426
427 SET_FLASH_PIO(0);
428
429 error = hideep_check_status(ts);
430 if (error)
431 return -EBUSY;
432
433 /* write page */
434 SET_FLASH_PIO(1);
435
436 val = be32_to_cpu(ucode[0]);
437 SET_PIO_SIG(HIDEEP_WRONLY | addr, val);
438
439 hideep_pgm_w_mem(ts, HIDEEP_FLASH_PIO_SIG | HIDEEP_WRONLY,
440 ucode, xfer_count);
441
442 val = be32_to_cpu(ucode[xfer_count - 1]);
443 SET_PIO_SIG(124, val);
444
445 SET_FLASH_PIO(0);
446
447 usleep_range(1000, 1100);
448
449 error = hideep_check_status(ts);
450 if (error)
451 return -EBUSY;
452
453 SET_FLASH_HWCONTROL();
454
455 return 0;
456}
457
458static int hideep_program_nvm(struct hideep_ts *ts,
459 const __be32 *ucode, size_t ucode_len)
460{
461 struct pgm_packet *packet_r = (void *)ts->xfer_buf;
462 __be32 *current_ucode = packet_r->payload;
463 size_t xfer_len;
464 size_t xfer_count;
465 u32 addr = 0;
466 int error;
467
468 hideep_nvm_unlock(ts);
469
470 while (ucode_len > 0) {
471 xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
472 xfer_count = xfer_len / sizeof(*ucode);
473
474 error = hideep_pgm_r_mem(ts, 0x00000000 + addr,
475 current_ucode, xfer_count);
476 if (error) {
477 dev_err(&ts->client->dev,
478 "%s: failed to read page at offset %#08x: %d\n",
479 __func__, addr, error);
480 return error;
481 }
482
483 /* See if the page needs updating */
484 if (memcmp(ucode, current_ucode, xfer_len)) {
485 error = hideep_program_page(ts, addr,
486 ucode, xfer_count);
487 if (error) {
488 dev_err(&ts->client->dev,
489 "%s: iwrite failure @%#08x: %d\n",
490 __func__, addr, error);
491 return error;
492 }
493
494 usleep_range(1000, 1100);
495 }
496
497 ucode += xfer_count;
498 addr += xfer_len;
499 ucode_len -= xfer_len;
500 }
501
502 return 0;
503}
504
505static int hideep_verify_nvm(struct hideep_ts *ts,
506 const __be32 *ucode, size_t ucode_len)
507{
508 struct pgm_packet *packet_r = (void *)ts->xfer_buf;
509 __be32 *current_ucode = packet_r->payload;
510 size_t xfer_len;
511 size_t xfer_count;
512 u32 addr = 0;
513 int i;
514 int error;
515
516 while (ucode_len > 0) {
517 xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
518 xfer_count = xfer_len / sizeof(*ucode);
519
520 error = hideep_pgm_r_mem(ts, 0x00000000 + addr,
521 current_ucode, xfer_count);
522 if (error) {
523 dev_err(&ts->client->dev,
524 "%s: failed to read page at offset %#08x: %d\n",
525 __func__, addr, error);
526 return error;
527 }
528
529 if (memcmp(ucode, current_ucode, xfer_len)) {
530 const u8 *ucode_bytes = (const u8 *)ucode;
531 const u8 *current_bytes = (const u8 *)current_ucode;
532
533 for (i = 0; i < xfer_len; i++)
534 if (ucode_bytes[i] != current_bytes[i])
535 dev_err(&ts->client->dev,
536 "%s: mismatch @%#08x: (%#02x vs %#02x)\n",
537 __func__, addr + i,
538 ucode_bytes[i],
539 current_bytes[i]);
540
541 return -EIO;
542 }
543
544 ucode += xfer_count;
545 addr += xfer_len;
546 ucode_len -= xfer_len;
547 }
548
549 return 0;
550}
551
552static int hideep_load_dwz(struct hideep_ts *ts)
553{
554 u16 product_code;
555 int error;
556
557 error = hideep_enter_pgm(ts);
558 if (error)
559 return error;
560
561 msleep(50);
562
563 error = hideep_pgm_r_mem(ts, HIDEEP_DWZ_INFO,
564 (void *)&ts->dwz_info,
565 sizeof(ts->dwz_info) / sizeof(__be32));
566
567 SW_RESET_IN_PGM(10);
568 msleep(50);
569
570 if (error) {
571 dev_err(&ts->client->dev,
572 "failed to fetch DWZ data: %d\n", error);
573 return error;
574 }
575
576 product_code = be16_to_cpu(ts->dwz_info.product_code);
577
578 switch (product_code & 0xF0) {
579 case 0x40:
580 dev_dbg(&ts->client->dev, "used crimson IC");
581 ts->fw_size = 1024 * 48;
582 ts->nvm_mask = 0x00310000;
583 break;
584 case 0x60:
585 dev_dbg(&ts->client->dev, "used lime IC");
586 ts->fw_size = 1024 * 64;
587 ts->nvm_mask = 0x0030027B;
588 break;
589 default:
590 dev_err(&ts->client->dev, "product code is wrong: %#04x",
591 product_code);
592 return -EINVAL;
593 }
594
595 dev_dbg(&ts->client->dev, "firmware release version: %#04x",
596 be16_to_cpu(ts->dwz_info.release_ver));
597
598 return 0;
599}
600
601static int hideep_flash_firmware(struct hideep_ts *ts,
602 const __be32 *ucode, size_t ucode_len)
603{
604 int retry_cnt = 3;
605 int error;
606
607 while (retry_cnt--) {
608 error = hideep_program_nvm(ts, ucode, ucode_len);
609 if (!error) {
610 error = hideep_verify_nvm(ts, ucode, ucode_len);
611 if (!error)
612 return 0;
613 }
614 }
615
616 return error;
617}
618
619static int hideep_update_firmware(struct hideep_ts *ts,
620 const __be32 *ucode, size_t ucode_len)
621{
622 int error, error2;
623
624 dev_dbg(&ts->client->dev, "starting firmware update");
625
626 /* enter program mode */
627 error = hideep_enter_pgm(ts);
628 if (error)
629 return error;
630
631 error = hideep_flash_firmware(ts, ucode, ucode_len);
632 if (error)
633 dev_err(&ts->client->dev,
634 "firmware update failed: %d\n", error);
635 else
636 dev_dbg(&ts->client->dev, "firmware updated successfully\n");
637
638 SW_RESET_IN_PGM(1000);
639
640 error2 = hideep_load_dwz(ts);
641 if (error2)
642 dev_err(&ts->client->dev,
643 "failed to load dwz after firmware update: %d\n",
644 error2);
645
646 return error ?: error2;
647}
648
649static int hideep_power_on(struct hideep_ts *ts)
650{
651 int error = 0;
652
653 error = regulator_enable(ts->vcc_vdd);
654 if (error)
655 dev_err(&ts->client->dev,
656 "failed to enable 'vdd' regulator: %d", error);
657
658 usleep_range(999, 1000);
659
660 error = regulator_enable(ts->vcc_vid);
661 if (error)
662 dev_err(&ts->client->dev,
663 "failed to enable 'vcc_vid' regulator: %d",
664 error);
665
666 msleep(30);
667
668 if (ts->reset_gpio) {
669 gpiod_set_value_cansleep(ts->reset_gpio, 0);
670 } else {
671 error = regmap_write(ts->reg, HIDEEP_RESET_CMD, 0x01);
672 if (error)
673 dev_err(&ts->client->dev,
674 "failed to send 'reset' command: %d\n", error);
675 }
676
677 msleep(50);
678
679 return error;
680}
681
682static void hideep_power_off(void *data)
683{
684 struct hideep_ts *ts = data;
685
686 if (ts->reset_gpio)
687 gpiod_set_value(ts->reset_gpio, 1);
688
689 regulator_disable(ts->vcc_vid);
690 regulator_disable(ts->vcc_vdd);
691}
692
693#define __GET_MT_TOOL_TYPE(type) ((type) == 0x01 ? MT_TOOL_FINGER : MT_TOOL_PEN)
694
695static void hideep_report_slot(struct input_dev *input,
696 const struct hideep_event *event)
697{
698 input_mt_slot(input, event->index & 0x0f);
699 input_mt_report_slot_state(input,
700 __GET_MT_TOOL_TYPE(event->type),
701 !(event->flag & HIDEEP_MT_RELEASED));
702 if (!(event->flag & HIDEEP_MT_RELEASED)) {
703 input_report_abs(input, ABS_MT_POSITION_X,
704 le16_to_cpup(&event->x));
705 input_report_abs(input, ABS_MT_POSITION_Y,
706 le16_to_cpup(&event->y));
707 input_report_abs(input, ABS_MT_PRESSURE,
708 le16_to_cpup(&event->z));
709 input_report_abs(input, ABS_MT_TOUCH_MAJOR, event->w);
710 }
711}
712
713static void hideep_parse_and_report(struct hideep_ts *ts)
714{
715 const struct hideep_event *events =
716 (void *)&ts->xfer_buf[HIDEEP_TOUCH_EVENT_INDEX];
717 const u8 *keys = &ts->xfer_buf[HIDEEP_KEY_EVENT_INDEX];
718 int touch_count = ts->xfer_buf[0];
719 int key_count = ts->xfer_buf[1] & 0x0f;
720 int lpm_count = ts->xfer_buf[1] & 0xf0;
721 int i;
722
723 /* get touch event count */
724 dev_dbg(&ts->client->dev, "mt = %d, key = %d, lpm = %02x",
725 touch_count, key_count, lpm_count);
726
727 touch_count = min(touch_count, HIDEEP_MT_MAX);
728 for (i = 0; i < touch_count; i++)
729 hideep_report_slot(ts->input_dev, events + i);
730
731 key_count = min(key_count, HIDEEP_KEY_MAX);
732 for (i = 0; i < key_count; i++) {
733 u8 key_data = keys[i * 2];
734
735 input_report_key(ts->input_dev,
736 ts->key_codes[key_data & HIDEEP_KEY_IDX_MASK],
737 key_data & HIDEEP_KEY_PRESSED_MASK);
738 }
739
740 input_mt_sync_frame(ts->input_dev);
741 input_sync(ts->input_dev);
742}
743
744static irqreturn_t hideep_irq(int irq, void *handle)
745{
746 struct hideep_ts *ts = handle;
747 int error;
748
749 BUILD_BUG_ON(HIDEEP_MAX_EVENT > HIDEEP_XFER_BUF_SIZE);
750
751 error = regmap_bulk_read(ts->reg, HIDEEP_EVENT_ADDR,
752 ts->xfer_buf, HIDEEP_MAX_EVENT / 2);
753 if (error) {
754 dev_err(&ts->client->dev, "failed to read events: %d\n", error);
755 goto out;
756 }
757
758 hideep_parse_and_report(ts);
759
760out:
761 return IRQ_HANDLED;
762}
763
764static int hideep_get_axis_info(struct hideep_ts *ts)
765{
766 __le16 val[2];
767 int error;
768
769 error = regmap_bulk_read(ts->reg, 0x28, val, ARRAY_SIZE(val));
770 if (error)
771 return error;
772
773 ts->prop.max_x = le16_to_cpup(val);
774 ts->prop.max_y = le16_to_cpup(val + 1);
775
776 dev_dbg(&ts->client->dev, "X: %d, Y: %d",
777 ts->prop.max_x, ts->prop.max_y);
778
779 return 0;
780}
781
782static int hideep_init_input(struct hideep_ts *ts)
783{
784 struct device *dev = &ts->client->dev;
785 int i;
786 int error;
787
788 ts->input_dev = devm_input_allocate_device(dev);
789 if (!ts->input_dev) {
790 dev_err(dev, "failed to allocate input device\n");
791 return -ENOMEM;
792 }
793
794 ts->input_dev->name = HIDEEP_TS_NAME;
795 ts->input_dev->id.bustype = BUS_I2C;
796 input_set_drvdata(ts->input_dev, ts);
797
798 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
799 input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
800 input_set_abs_params(ts->input_dev, ABS_MT_PRESSURE, 0, 65535, 0, 0);
801 input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
802 input_set_abs_params(ts->input_dev, ABS_MT_TOOL_TYPE,
803 0, MT_TOOL_MAX, 0, 0);
804 touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
805
806 if (ts->prop.max_x == 0 || ts->prop.max_y == 0) {
807 error = hideep_get_axis_info(ts);
808 if (error)
809 return error;
810 }
811
812 error = input_mt_init_slots(ts->input_dev, HIDEEP_MT_MAX,
813 INPUT_MT_DIRECT);
814 if (error)
815 return error;
816
817 ts->key_num = device_property_read_u32_array(dev, "linux,keycodes",
818 NULL, 0);
819 if (ts->key_num > HIDEEP_KEY_MAX) {
820 dev_err(dev, "too many keys defined: %d\n",
821 ts->key_num);
822 return -EINVAL;
823 }
824
825 if (ts->key_num <= 0) {
826 dev_dbg(dev,
827 "missing or malformed 'linux,keycodes' property\n");
828 } else {
829 error = device_property_read_u32_array(dev, "linux,keycodes",
830 ts->key_codes,
831 ts->key_num);
832 if (error) {
833 dev_dbg(dev, "failed to read keymap: %d", error);
834 return error;
835 }
836
837 if (ts->key_num) {
838 ts->input_dev->keycode = ts->key_codes;
839 ts->input_dev->keycodesize = sizeof(ts->key_codes[0]);
840 ts->input_dev->keycodemax = ts->key_num;
841
842 for (i = 0; i < ts->key_num; i++)
843 input_set_capability(ts->input_dev, EV_KEY,
844 ts->key_codes[i]);
845 }
846 }
847
848 error = input_register_device(ts->input_dev);
849 if (error) {
850 dev_err(dev, "failed to register input device: %d", error);
851 return error;
852 }
853
854 return 0;
855}
856
857static ssize_t hideep_update_fw(struct device *dev,
858 struct device_attribute *attr,
859 const char *buf, size_t count)
860{
861 struct i2c_client *client = to_i2c_client(dev);
862 struct hideep_ts *ts = i2c_get_clientdata(client);
863 const struct firmware *fw_entry;
864 char *fw_name;
865 int mode;
866 int error;
867
868 error = kstrtoint(buf, 0, &mode);
869 if (error)
870 return error;
871
872 fw_name = kasprintf(GFP_KERNEL, "hideep_ts_%04x.bin",
873 be16_to_cpu(ts->dwz_info.product_id));
874 if (!fw_name)
875 return -ENOMEM;
876
877 error = request_firmware(&fw_entry, fw_name, dev);
878 if (error) {
879 dev_err(dev, "failed to request firmware %s: %d",
880 fw_name, error);
881 goto out_free_fw_name;
882 }
883
884 if (fw_entry->size % sizeof(__be32)) {
885 dev_err(dev, "invalid firmware size %zu\n", fw_entry->size);
886 error = -EINVAL;
887 goto out_release_fw;
888 }
889
890 if (fw_entry->size > ts->fw_size) {
891 dev_err(dev, "fw size (%zu) is too big (memory size %d)\n",
892 fw_entry->size, ts->fw_size);
893 error = -EFBIG;
894 goto out_release_fw;
895 }
896
897 mutex_lock(&ts->dev_mutex);
898 disable_irq(client->irq);
899
900 error = hideep_update_firmware(ts, (const __be32 *)fw_entry->data,
901 fw_entry->size);
902
903 enable_irq(client->irq);
904 mutex_unlock(&ts->dev_mutex);
905
906out_release_fw:
907 release_firmware(fw_entry);
908out_free_fw_name:
909 kfree(fw_name);
910
911 return error ?: count;
912}
913
914static ssize_t hideep_fw_version_show(struct device *dev,
915 struct device_attribute *attr, char *buf)
916{
917 struct i2c_client *client = to_i2c_client(dev);
918 struct hideep_ts *ts = i2c_get_clientdata(client);
919 ssize_t len;
920
921 mutex_lock(&ts->dev_mutex);
922 len = scnprintf(buf, PAGE_SIZE, "%04x\n",
923 be16_to_cpu(ts->dwz_info.release_ver));
924 mutex_unlock(&ts->dev_mutex);
925
926 return len;
927}
928
929static ssize_t hideep_product_id_show(struct device *dev,
930 struct device_attribute *attr, char *buf)
931{
932 struct i2c_client *client = to_i2c_client(dev);
933 struct hideep_ts *ts = i2c_get_clientdata(client);
934 ssize_t len;
935
936 mutex_lock(&ts->dev_mutex);
937 len = scnprintf(buf, PAGE_SIZE, "%04x\n",
938 be16_to_cpu(ts->dwz_info.product_id));
939 mutex_unlock(&ts->dev_mutex);
940
941 return len;
942}
943
944static DEVICE_ATTR(version, 0664, hideep_fw_version_show, NULL);
945static DEVICE_ATTR(product_id, 0664, hideep_product_id_show, NULL);
946static DEVICE_ATTR(update_fw, 0664, NULL, hideep_update_fw);
947
948static struct attribute *hideep_ts_sysfs_entries[] = {
949 &dev_attr_version.attr,
950 &dev_attr_product_id.attr,
951 &dev_attr_update_fw.attr,
952 NULL,
953};
954
955static const struct attribute_group hideep_ts_attr_group = {
956 .attrs = hideep_ts_sysfs_entries,
957};
958
959static int __maybe_unused hideep_suspend(struct device *dev)
960{
961 struct i2c_client *client = to_i2c_client(dev);
962 struct hideep_ts *ts = i2c_get_clientdata(client);
963
964 disable_irq(client->irq);
965 hideep_power_off(ts);
966
967 return 0;
968}
969
970static int __maybe_unused hideep_resume(struct device *dev)
971{
972 struct i2c_client *client = to_i2c_client(dev);
973 struct hideep_ts *ts = i2c_get_clientdata(client);
974 int error;
975
976 error = hideep_power_on(ts);
977 if (error) {
978 dev_err(&client->dev, "power on failed");
979 return error;
980 }
981
982 enable_irq(client->irq);
983
984 return 0;
985}
986
987static SIMPLE_DEV_PM_OPS(hideep_pm_ops, hideep_suspend, hideep_resume);
988
989static const struct regmap_config hideep_regmap_config = {
990 .reg_bits = 16,
991 .reg_format_endian = REGMAP_ENDIAN_LITTLE,
992 .val_bits = 16,
993 .val_format_endian = REGMAP_ENDIAN_LITTLE,
994 .max_register = 0xffff,
995};
996
997static int hideep_probe(struct i2c_client *client,
998 const struct i2c_device_id *id)
999{
1000 struct hideep_ts *ts;
1001 int error;
1002
1003 /* check i2c bus */
1004 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1005 dev_err(&client->dev, "check i2c device error");
1006 return -ENODEV;
1007 }
1008
1009 if (client->irq <= 0) {
1010 dev_err(&client->dev, "missing irq: %d\n", client->irq);
1011 return -EINVAL;
1012 }
1013
1014 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1015 if (!ts)
1016 return -ENOMEM;
1017
1018 ts->client = client;
1019 i2c_set_clientdata(client, ts);
1020 mutex_init(&ts->dev_mutex);
1021
1022 ts->reg = devm_regmap_init_i2c(client, &hideep_regmap_config);
1023 if (IS_ERR(ts->reg)) {
1024 error = PTR_ERR(ts->reg);
1025 dev_err(&client->dev,
1026 "failed to initialize regmap: %d\n", error);
1027 return error;
1028 }
1029
1030 ts->vcc_vdd = devm_regulator_get(&client->dev, "vdd");
1031 if (IS_ERR(ts->vcc_vdd))
1032 return PTR_ERR(ts->vcc_vdd);
1033
1034 ts->vcc_vid = devm_regulator_get(&client->dev, "vid");
1035 if (IS_ERR(ts->vcc_vid))
1036 return PTR_ERR(ts->vcc_vid);
1037
1038 ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
1039 "reset", GPIOD_OUT_HIGH);
1040 if (IS_ERR(ts->reset_gpio))
1041 return PTR_ERR(ts->reset_gpio);
1042
1043 error = hideep_power_on(ts);
1044 if (error) {
1045 dev_err(&client->dev, "power on failed: %d\n", error);
1046 return error;
1047 }
1048
1049 error = devm_add_action_or_reset(&client->dev, hideep_power_off, ts);
1050 if (error)
1051 return error;
1052
1053 error = hideep_load_dwz(ts);
1054 if (error) {
1055 dev_err(&client->dev, "failed to load dwz: %d", error);
1056 return error;
1057 }
1058
1059 error = hideep_init_input(ts);
1060 if (error)
1061 return error;
1062
1063 error = devm_request_threaded_irq(&client->dev, client->irq,
1064 NULL, hideep_irq, IRQF_ONESHOT,
1065 client->name, ts);
1066 if (error) {
1067 dev_err(&client->dev, "failed to request irq %d: %d\n",
1068 client->irq, error);
1069 return error;
1070 }
1071
1072 error = devm_device_add_group(&client->dev, &hideep_ts_attr_group);
1073 if (error) {
1074 dev_err(&client->dev,
1075 "failed to add sysfs attributes: %d\n", error);
1076 return error;
1077 }
1078
1079 return 0;
1080}
1081
1082static const struct i2c_device_id hideep_i2c_id[] = {
1083 { HIDEEP_I2C_NAME, 0 },
1084 { }
1085};
1086MODULE_DEVICE_TABLE(i2c, hideep_i2c_id);
1087
1088#ifdef CONFIG_ACPI
1089static const struct acpi_device_id hideep_acpi_id[] = {
1090 { "HIDP0001", 0 },
1091 { }
1092};
1093MODULE_DEVICE_TABLE(acpi, hideep_acpi_id);
1094#endif
1095
1096#ifdef CONFIG_OF
1097static const struct of_device_id hideep_match_table[] = {
1098 { .compatible = "hideep,hideep-ts" },
1099 { }
1100};
1101MODULE_DEVICE_TABLE(of, hideep_match_table);
1102#endif
1103
1104static struct i2c_driver hideep_driver = {
1105 .driver = {
1106 .name = HIDEEP_I2C_NAME,
1107 .of_match_table = of_match_ptr(hideep_match_table),
1108 .acpi_match_table = ACPI_PTR(hideep_acpi_id),
1109 .pm = &hideep_pm_ops,
1110 },
1111 .id_table = hideep_i2c_id,
1112 .probe = hideep_probe,
1113};
1114
1115module_i2c_driver(hideep_driver);
1116
1117MODULE_DESCRIPTION("Driver for HiDeep Touchscreen Controller");
1118MODULE_AUTHOR("anthony.kim@hideep.com");
1119MODULE_LICENSE("GPL v2");