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1/*
2 * MELFAS MIP4 Touchscreen
3 *
4 * Copyright (C) 2016 MELFAS Inc.
5 *
6 * Author : Sangwon Jee <jeesw@melfas.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/acpi.h>
20#include <linux/delay.h>
21#include <linux/firmware.h>
22#include <linux/gpio/consumer.h>
23#include <linux/i2c.h>
24#include <linux/input.h>
25#include <linux/input/mt.h>
26#include <linux/interrupt.h>
27#include <linux/module.h>
28#include <linux/of.h>
29#include <linux/slab.h>
30#include <asm/unaligned.h>
31
32#define MIP4_DEVICE_NAME "mip4_ts"
33
34/*****************************************************************
35 * Protocol
36 * Version : MIP 4.0 Rev 5.4
37 *****************************************************************/
38
39/* Address */
40#define MIP4_R0_BOOT 0x00
41#define MIP4_R1_BOOT_MODE 0x01
42#define MIP4_R1_BOOT_BUF_ADDR 0x10
43#define MIP4_R1_BOOT_STATUS 0x20
44#define MIP4_R1_BOOT_CMD 0x30
45#define MIP4_R1_BOOT_TARGET_ADDR 0x40
46#define MIP4_R1_BOOT_SIZE 0x44
47
48#define MIP4_R0_INFO 0x01
49#define MIP4_R1_INFO_PRODUCT_NAME 0x00
50#define MIP4_R1_INFO_RESOLUTION_X 0x10
51#define MIP4_R1_INFO_RESOLUTION_Y 0x12
52#define MIP4_R1_INFO_NODE_NUM_X 0x14
53#define MIP4_R1_INFO_NODE_NUM_Y 0x15
54#define MIP4_R1_INFO_KEY_NUM 0x16
55#define MIP4_R1_INFO_PRESSURE_NUM 0x17
56#define MIP4_R1_INFO_LENGTH_X 0x18
57#define MIP4_R1_INFO_LENGTH_Y 0x1A
58#define MIP4_R1_INFO_PPM_X 0x1C
59#define MIP4_R1_INFO_PPM_Y 0x1D
60#define MIP4_R1_INFO_VERSION_BOOT 0x20
61#define MIP4_R1_INFO_VERSION_CORE 0x22
62#define MIP4_R1_INFO_VERSION_APP 0x24
63#define MIP4_R1_INFO_VERSION_PARAM 0x26
64#define MIP4_R1_INFO_SECT_BOOT_START 0x30
65#define MIP4_R1_INFO_SECT_BOOT_END 0x31
66#define MIP4_R1_INFO_SECT_CORE_START 0x32
67#define MIP4_R1_INFO_SECT_CORE_END 0x33
68#define MIP4_R1_INFO_SECT_APP_START 0x34
69#define MIP4_R1_INFO_SECT_APP_END 0x35
70#define MIP4_R1_INFO_SECT_PARAM_START 0x36
71#define MIP4_R1_INFO_SECT_PARAM_END 0x37
72#define MIP4_R1_INFO_BUILD_DATE 0x40
73#define MIP4_R1_INFO_BUILD_TIME 0x44
74#define MIP4_R1_INFO_CHECKSUM_PRECALC 0x48
75#define MIP4_R1_INFO_CHECKSUM_REALTIME 0x4A
76#define MIP4_R1_INFO_PROTOCOL_NAME 0x50
77#define MIP4_R1_INFO_PROTOCOL_VERSION 0x58
78#define MIP4_R1_INFO_IC_ID 0x70
79#define MIP4_R1_INFO_IC_NAME 0x71
80#define MIP4_R1_INFO_IC_VENDOR_ID 0x75
81#define MIP4_R1_INFO_IC_HW_CATEGORY 0x77
82#define MIP4_R1_INFO_CONTACT_THD_SCR 0x78
83#define MIP4_R1_INFO_CONTACT_THD_KEY 0x7A
84#define MIP4_R1_INFO_PID 0x7C
85#define MIP4_R1_INFO_VID 0x7E
86#define MIP4_R1_INFO_SLAVE_ADDR 0x80
87
88#define MIP4_R0_EVENT 0x02
89#define MIP4_R1_EVENT_SUPPORTED_FUNC 0x00
90#define MIP4_R1_EVENT_FORMAT 0x04
91#define MIP4_R1_EVENT_SIZE 0x06
92#define MIP4_R1_EVENT_PACKET_INFO 0x10
93#define MIP4_R1_EVENT_PACKET_DATA 0x11
94
95#define MIP4_R0_CTRL 0x06
96#define MIP4_R1_CTRL_READY_STATUS 0x00
97#define MIP4_R1_CTRL_EVENT_READY 0x01
98#define MIP4_R1_CTRL_MODE 0x10
99#define MIP4_R1_CTRL_EVENT_TRIGGER_TYPE 0x11
100#define MIP4_R1_CTRL_RECALIBRATE 0x12
101#define MIP4_R1_CTRL_POWER_STATE 0x13
102#define MIP4_R1_CTRL_GESTURE_TYPE 0x14
103#define MIP4_R1_CTRL_DISABLE_ESD_ALERT 0x18
104#define MIP4_R1_CTRL_CHARGER_MODE 0x19
105#define MIP4_R1_CTRL_HIGH_SENS_MODE 0x1A
106#define MIP4_R1_CTRL_WINDOW_MODE 0x1B
107#define MIP4_R1_CTRL_PALM_REJECTION 0x1C
108#define MIP4_R1_CTRL_EDGE_CORRECTION 0x1D
109#define MIP4_R1_CTRL_ENTER_GLOVE_MODE 0x1E
110#define MIP4_R1_CTRL_I2C_ON_LPM 0x1F
111#define MIP4_R1_CTRL_GESTURE_DEBUG 0x20
112#define MIP4_R1_CTRL_PALM_EVENT 0x22
113#define MIP4_R1_CTRL_PROXIMITY_SENSING 0x23
114
115/* Value */
116#define MIP4_BOOT_MODE_BOOT 0x01
117#define MIP4_BOOT_MODE_APP 0x02
118
119#define MIP4_BOOT_STATUS_BUSY 0x05
120#define MIP4_BOOT_STATUS_ERROR 0x0E
121#define MIP4_BOOT_STATUS_DONE 0xA0
122
123#define MIP4_BOOT_CMD_MASS_ERASE 0x15
124#define MIP4_BOOT_CMD_PROGRAM 0x54
125#define MIP4_BOOT_CMD_ERASE 0x8F
126#define MIP4_BOOT_CMD_WRITE 0xA5
127#define MIP4_BOOT_CMD_READ 0xC2
128
129#define MIP4_EVENT_INPUT_TYPE_KEY 0
130#define MIP4_EVENT_INPUT_TYPE_SCREEN 1
131#define MIP4_EVENT_INPUT_TYPE_PROXIMITY 2
132
133#define I2C_RETRY_COUNT 3 /* 2~ */
134
135#define MIP4_BUF_SIZE 128
136#define MIP4_MAX_FINGERS 10
137#define MIP4_MAX_KEYS 4
138
139#define MIP4_TOUCH_MAJOR_MIN 0
140#define MIP4_TOUCH_MAJOR_MAX 255
141#define MIP4_TOUCH_MINOR_MIN 0
142#define MIP4_TOUCH_MINOR_MAX 255
143#define MIP4_PRESSURE_MIN 0
144#define MIP4_PRESSURE_MAX 255
145
146#define MIP4_FW_NAME "melfas_mip4.fw"
147#define MIP4_FW_UPDATE_DEBUG 0 /* 0 (default) or 1 */
148
149struct mip4_fw_version {
150 u16 boot;
151 u16 core;
152 u16 app;
153 u16 param;
154};
155
156struct mip4_ts {
157 struct i2c_client *client;
158 struct input_dev *input;
159 struct gpio_desc *gpio_ce;
160
161 char phys[32];
162 char product_name[16];
163 u16 product_id;
164 char ic_name[4];
165 char fw_name[32];
166
167 unsigned int max_x;
168 unsigned int max_y;
169 u8 node_x;
170 u8 node_y;
171 u8 node_key;
172 unsigned int ppm_x;
173 unsigned int ppm_y;
174
175 struct mip4_fw_version fw_version;
176
177 unsigned int event_size;
178 unsigned int event_format;
179
180 unsigned int key_num;
181 unsigned short key_code[MIP4_MAX_KEYS];
182
183 bool wake_irq_enabled;
184
185 u8 buf[MIP4_BUF_SIZE];
186};
187
188static int mip4_i2c_xfer(struct mip4_ts *ts,
189 char *write_buf, unsigned int write_len,
190 char *read_buf, unsigned int read_len)
191{
192 struct i2c_msg msg[] = {
193 {
194 .addr = ts->client->addr,
195 .flags = 0,
196 .buf = write_buf,
197 .len = write_len,
198 }, {
199 .addr = ts->client->addr,
200 .flags = I2C_M_RD,
201 .buf = read_buf,
202 .len = read_len,
203 },
204 };
205 int retry = I2C_RETRY_COUNT;
206 int res;
207 int error;
208
209 do {
210 res = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
211 if (res == ARRAY_SIZE(msg))
212 return 0;
213
214 error = res < 0 ? res : -EIO;
215 dev_err(&ts->client->dev,
216 "%s - i2c_transfer failed: %d (%d)\n",
217 __func__, error, res);
218 } while (--retry);
219
220 return error;
221}
222
223static void mip4_parse_fw_version(const u8 *buf, struct mip4_fw_version *v)
224{
225 v->boot = get_unaligned_le16(buf + 0);
226 v->core = get_unaligned_le16(buf + 2);
227 v->app = get_unaligned_le16(buf + 4);
228 v->param = get_unaligned_le16(buf + 6);
229}
230
231/*
232 * Read chip firmware version
233 */
234static int mip4_get_fw_version(struct mip4_ts *ts)
235{
236 u8 cmd[] = { MIP4_R0_INFO, MIP4_R1_INFO_VERSION_BOOT };
237 u8 buf[sizeof(ts->fw_version)];
238 int error;
239
240 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, sizeof(buf));
241 if (error) {
242 memset(&ts->fw_version, 0xff, sizeof(ts->fw_version));
243 return error;
244 }
245
246 mip4_parse_fw_version(buf, &ts->fw_version);
247
248 return 0;
249}
250
251/*
252 * Fetch device characteristics
253 */
254static int mip4_query_device(struct mip4_ts *ts)
255{
256 int error;
257 u8 cmd[2];
258 u8 buf[14];
259
260 /* Product name */
261 cmd[0] = MIP4_R0_INFO;
262 cmd[1] = MIP4_R1_INFO_PRODUCT_NAME;
263 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd),
264 ts->product_name, sizeof(ts->product_name));
265 if (error)
266 dev_warn(&ts->client->dev,
267 "Failed to retrieve product name: %d\n", error);
268 else
269 dev_dbg(&ts->client->dev, "product name: %.*s\n",
270 (int)sizeof(ts->product_name), ts->product_name);
271
272 /* Product ID */
273 cmd[0] = MIP4_R0_INFO;
274 cmd[1] = MIP4_R1_INFO_PID;
275 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 2);
276 if (error) {
277 dev_warn(&ts->client->dev,
278 "Failed to retrieve product id: %d\n", error);
279 } else {
280 ts->product_id = get_unaligned_le16(&buf[0]);
281 dev_dbg(&ts->client->dev, "product id: %04X\n", ts->product_id);
282 }
283
284 /* Firmware name */
285 snprintf(ts->fw_name, sizeof(ts->fw_name),
286 "melfas_mip4_%04X.fw", ts->product_id);
287 dev_dbg(&ts->client->dev, "firmware name: %s\n", ts->fw_name);
288
289 /* IC name */
290 cmd[0] = MIP4_R0_INFO;
291 cmd[1] = MIP4_R1_INFO_IC_NAME;
292 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd),
293 ts->ic_name, sizeof(ts->ic_name));
294 if (error)
295 dev_warn(&ts->client->dev,
296 "Failed to retrieve IC name: %d\n", error);
297 else
298 dev_dbg(&ts->client->dev, "IC name: %.*s\n",
299 (int)sizeof(ts->ic_name), ts->ic_name);
300
301 /* Firmware version */
302 error = mip4_get_fw_version(ts);
303 if (error)
304 dev_warn(&ts->client->dev,
305 "Failed to retrieve FW version: %d\n", error);
306 else
307 dev_dbg(&ts->client->dev, "F/W Version: %04X %04X %04X %04X\n",
308 ts->fw_version.boot, ts->fw_version.core,
309 ts->fw_version.app, ts->fw_version.param);
310
311 /* Resolution */
312 cmd[0] = MIP4_R0_INFO;
313 cmd[1] = MIP4_R1_INFO_RESOLUTION_X;
314 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 14);
315 if (error) {
316 dev_warn(&ts->client->dev,
317 "Failed to retrieve touchscreen parameters: %d\n",
318 error);
319 } else {
320 ts->max_x = get_unaligned_le16(&buf[0]);
321 ts->max_y = get_unaligned_le16(&buf[2]);
322 dev_dbg(&ts->client->dev, "max_x: %d, max_y: %d\n",
323 ts->max_x, ts->max_y);
324
325 ts->node_x = buf[4];
326 ts->node_y = buf[5];
327 ts->node_key = buf[6];
328 dev_dbg(&ts->client->dev,
329 "node_x: %d, node_y: %d, node_key: %d\n",
330 ts->node_x, ts->node_y, ts->node_key);
331
332 ts->ppm_x = buf[12];
333 ts->ppm_y = buf[13];
334 dev_dbg(&ts->client->dev, "ppm_x: %d, ppm_y: %d\n",
335 ts->ppm_x, ts->ppm_y);
336
337 /* Key ts */
338 if (ts->node_key > 0)
339 ts->key_num = ts->node_key;
340 }
341
342 /* Protocol */
343 cmd[0] = MIP4_R0_EVENT;
344 cmd[1] = MIP4_R1_EVENT_SUPPORTED_FUNC;
345 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 7);
346 if (error) {
347 dev_warn(&ts->client->dev,
348 "Failed to retrieve device type: %d\n", error);
349 ts->event_format = 0xff;
350 } else {
351 ts->event_format = get_unaligned_le16(&buf[4]);
352 ts->event_size = buf[6];
353 dev_dbg(&ts->client->dev, "event_format: %d, event_size: %d\n",
354 ts->event_format, ts->event_size);
355
356 if (ts->event_format == 2 || ts->event_format > 3)
357 dev_warn(&ts->client->dev,
358 "Unknown event format %d\n", ts->event_format);
359 }
360
361 return 0;
362}
363
364static int mip4_power_on(struct mip4_ts *ts)
365{
366 if (ts->gpio_ce) {
367 gpiod_set_value_cansleep(ts->gpio_ce, 1);
368
369 /* Booting delay : 200~300ms */
370 usleep_range(200 * 1000, 300 * 1000);
371 }
372
373 return 0;
374}
375
376static void mip4_power_off(struct mip4_ts *ts)
377{
378 if (ts->gpio_ce)
379 gpiod_set_value_cansleep(ts->gpio_ce, 0);
380}
381
382/*
383 * Clear touch input event status
384 */
385static void mip4_clear_input(struct mip4_ts *ts)
386{
387 int i;
388
389 /* Screen */
390 for (i = 0; i < MIP4_MAX_FINGERS; i++) {
391 input_mt_slot(ts->input, i);
392 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0);
393 }
394
395 /* Keys */
396 for (i = 0; i < ts->key_num; i++)
397 input_report_key(ts->input, ts->key_code[i], 0);
398
399 input_sync(ts->input);
400}
401
402static int mip4_enable(struct mip4_ts *ts)
403{
404 int error;
405
406 error = mip4_power_on(ts);
407 if (error)
408 return error;
409
410 enable_irq(ts->client->irq);
411
412 return 0;
413}
414
415static void mip4_disable(struct mip4_ts *ts)
416{
417 disable_irq(ts->client->irq);
418
419 mip4_power_off(ts);
420
421 mip4_clear_input(ts);
422}
423
424/*****************************************************************
425 * Input handling
426 *****************************************************************/
427
428static void mip4_report_keys(struct mip4_ts *ts, u8 *packet)
429{
430 u8 key;
431 bool down;
432
433 switch (ts->event_format) {
434 case 0:
435 case 1:
436 key = packet[0] & 0x0F;
437 down = packet[0] & 0x80;
438 break;
439
440 case 3:
441 default:
442 key = packet[0] & 0x0F;
443 down = packet[1] & 0x01;
444 break;
445 }
446
447 /* Report key event */
448 if (key >= 1 && key <= ts->key_num) {
449 unsigned short keycode = ts->key_code[key - 1];
450
451 dev_dbg(&ts->client->dev,
452 "Key - ID: %d, keycode: %d, state: %d\n",
453 key, keycode, down);
454
455 input_event(ts->input, EV_MSC, MSC_SCAN, keycode);
456 input_report_key(ts->input, keycode, down);
457
458 } else {
459 dev_err(&ts->client->dev, "Unknown key: %d\n", key);
460 }
461}
462
463static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
464{
465 int id;
466 bool hover;
467 bool palm;
468 bool state;
469 u16 x, y;
470 u8 pressure_stage = 0;
471 u8 pressure;
472 u8 size;
473 u8 touch_major;
474 u8 touch_minor;
475
476 switch (ts->event_format) {
477 case 0:
478 case 1:
479 /* Touch only */
480 state = packet[0] & BIT(7);
481 hover = packet[0] & BIT(5);
482 palm = packet[0] & BIT(4);
483 id = (packet[0] & 0x0F) - 1;
484 x = ((packet[1] & 0x0F) << 8) | packet[2];
485 y = (((packet[1] >> 4) & 0x0F) << 8) |
486 packet[3];
487 pressure = packet[4];
488 size = packet[5];
489 if (ts->event_format == 0) {
490 touch_major = packet[5];
491 touch_minor = packet[5];
492 } else {
493 touch_major = packet[6];
494 touch_minor = packet[7];
495 }
496 break;
497
498 case 3:
499 default:
500 /* Touch + Force(Pressure) */
501 id = (packet[0] & 0x0F) - 1;
502 hover = packet[1] & BIT(2);
503 palm = packet[1] & BIT(1);
504 state = packet[1] & BIT(0);
505 x = ((packet[2] & 0x0F) << 8) | packet[3];
506 y = (((packet[2] >> 4) & 0x0F) << 8) |
507 packet[4];
508 size = packet[6];
509 pressure_stage = (packet[7] & 0xF0) >> 4;
510 pressure = ((packet[7] & 0x0F) << 8) |
511 packet[8];
512 touch_major = packet[9];
513 touch_minor = packet[10];
514 break;
515 }
516
517 dev_dbg(&ts->client->dev,
518 "Screen - Slot: %d State: %d X: %04d Y: %04d Z: %d\n",
519 id, state, x, y, pressure);
520
521 if (unlikely(id < 0 || id >= MIP4_MAX_FINGERS)) {
522 dev_err(&ts->client->dev, "Screen - invalid slot ID: %d\n", id);
523 } else if (state) {
524 /* Press or Move event */
525 input_mt_slot(ts->input, id);
526 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
527 input_report_abs(ts->input, ABS_MT_POSITION_X, x);
528 input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
529 input_report_abs(ts->input, ABS_MT_PRESSURE, pressure);
530 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, touch_major);
531 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, touch_minor);
532 } else {
533 /* Release event */
534 input_mt_slot(ts->input, id);
535 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0);
536 }
537
538 input_mt_sync_frame(ts->input);
539}
540
541static int mip4_handle_packet(struct mip4_ts *ts, u8 *packet)
542{
543 u8 type;
544
545 switch (ts->event_format) {
546 case 0:
547 case 1:
548 type = (packet[0] & 0x40) >> 6;
549 break;
550
551 case 3:
552 type = (packet[0] & 0xF0) >> 4;
553 break;
554
555 default:
556 /* Should not happen unless we have corrupted firmware */
557 return -EINVAL;
558 }
559
560 dev_dbg(&ts->client->dev, "Type: %d\n", type);
561
562 /* Report input event */
563 switch (type) {
564 case MIP4_EVENT_INPUT_TYPE_KEY:
565 mip4_report_keys(ts, packet);
566 break;
567
568 case MIP4_EVENT_INPUT_TYPE_SCREEN:
569 mip4_report_touch(ts, packet);
570 break;
571
572 default:
573 dev_err(&ts->client->dev, "Unknown event type: %d\n", type);
574 break;
575 }
576
577 return 0;
578}
579
580static irqreturn_t mip4_interrupt(int irq, void *dev_id)
581{
582 struct mip4_ts *ts = dev_id;
583 struct i2c_client *client = ts->client;
584 unsigned int i;
585 int error;
586 u8 cmd[2];
587 u8 size;
588 bool alert;
589
590 /* Read packet info */
591 cmd[0] = MIP4_R0_EVENT;
592 cmd[1] = MIP4_R1_EVENT_PACKET_INFO;
593 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, 1);
594 if (error) {
595 dev_err(&client->dev,
596 "Failed to read packet info: %d\n", error);
597 goto out;
598 }
599
600 size = ts->buf[0] & 0x7F;
601 alert = ts->buf[0] & BIT(7);
602 dev_dbg(&client->dev, "packet size: %d, alert: %d\n", size, alert);
603
604 /* Check size */
605 if (!size) {
606 dev_err(&client->dev, "Empty packet\n");
607 goto out;
608 }
609
610 /* Read packet data */
611 cmd[0] = MIP4_R0_EVENT;
612 cmd[1] = MIP4_R1_EVENT_PACKET_DATA;
613 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, size);
614 if (error) {
615 dev_err(&client->dev,
616 "Failed to read packet data: %d\n", error);
617 goto out;
618 }
619
620 if (alert) {
621 dev_dbg(&client->dev, "Alert: %d\n", ts->buf[0]);
622 } else {
623 for (i = 0; i < size; i += ts->event_size) {
624 error = mip4_handle_packet(ts, &ts->buf[i]);
625 if (error)
626 break;
627 }
628
629 input_sync(ts->input);
630 }
631
632out:
633 return IRQ_HANDLED;
634}
635
636static int mip4_input_open(struct input_dev *dev)
637{
638 struct mip4_ts *ts = input_get_drvdata(dev);
639
640 return mip4_enable(ts);
641}
642
643static void mip4_input_close(struct input_dev *dev)
644{
645 struct mip4_ts *ts = input_get_drvdata(dev);
646
647 mip4_disable(ts);
648}
649
650/*****************************************************************
651 * Firmware update
652 *****************************************************************/
653
654/* Firmware Info */
655#define MIP4_BL_PAGE_SIZE 512 /* 512 */
656#define MIP4_BL_PACKET_SIZE 512 /* 512, 256, 128, 64, ... */
657
658/*
659 * Firmware binary tail info
660 */
661
662struct mip4_bin_tail {
663 u8 tail_mark[4];
664 u8 chip_name[4];
665
666 __le32 bin_start_addr;
667 __le32 bin_length;
668
669 __le16 ver_boot;
670 __le16 ver_core;
671 __le16 ver_app;
672 __le16 ver_param;
673
674 u8 boot_start;
675 u8 boot_end;
676 u8 core_start;
677 u8 core_end;
678 u8 app_start;
679 u8 app_end;
680 u8 param_start;
681 u8 param_end;
682
683 u8 checksum_type;
684 u8 hw_category;
685
686 __le16 param_id;
687 __le32 param_length;
688 __le32 build_date;
689 __le32 build_time;
690
691 __le32 reserved1;
692 __le32 reserved2;
693 __le16 reserved3;
694 __le16 tail_size;
695 __le32 crc;
696} __packed;
697
698#define MIP4_BIN_TAIL_MARK "MBT\001"
699#define MIP4_BIN_TAIL_SIZE (sizeof(struct mip4_bin_tail))
700
701/*
702* Bootloader - Read status
703*/
704static int mip4_bl_read_status(struct mip4_ts *ts)
705{
706 u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_STATUS };
707 u8 result;
708 struct i2c_msg msg[] = {
709 {
710 .addr = ts->client->addr,
711 .flags = 0,
712 .buf = cmd,
713 .len = sizeof(cmd),
714 }, {
715 .addr = ts->client->addr,
716 .flags = I2C_M_RD,
717 .buf = &result,
718 .len = sizeof(result),
719 },
720 };
721 int ret;
722 int error;
723 int retry = 1000;
724
725 do {
726 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
727 if (ret != ARRAY_SIZE(msg)) {
728 error = ret < 0 ? ret : -EIO;
729 dev_err(&ts->client->dev,
730 "Failed to read bootloader status: %d\n",
731 error);
732 return error;
733 }
734
735 switch (result) {
736 case MIP4_BOOT_STATUS_DONE:
737 dev_dbg(&ts->client->dev, "%s - done\n", __func__);
738 return 0;
739
740 case MIP4_BOOT_STATUS_ERROR:
741 dev_err(&ts->client->dev, "Bootloader failure\n");
742 return -EIO;
743
744 case MIP4_BOOT_STATUS_BUSY:
745 dev_dbg(&ts->client->dev, "%s - Busy\n", __func__);
746 error = -EBUSY;
747 break;
748
749 default:
750 dev_err(&ts->client->dev,
751 "Unexpected bootloader status: %#02x\n",
752 result);
753 error = -EINVAL;
754 break;
755 }
756
757 usleep_range(1000, 2000);
758 } while (--retry);
759
760 return error;
761}
762
763/*
764* Bootloader - Change mode
765*/
766static int mip4_bl_change_mode(struct mip4_ts *ts, u8 mode)
767{
768 u8 mode_chg_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE, mode };
769 u8 mode_read_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE };
770 u8 result;
771 struct i2c_msg msg[] = {
772 {
773 .addr = ts->client->addr,
774 .flags = 0,
775 .buf = mode_read_cmd,
776 .len = sizeof(mode_read_cmd),
777 }, {
778 .addr = ts->client->addr,
779 .flags = I2C_M_RD,
780 .buf = &result,
781 .len = sizeof(result),
782 },
783 };
784 int retry = 10;
785 int ret;
786 int error;
787
788 do {
789 /* Send mode change command */
790 ret = i2c_master_send(ts->client,
791 mode_chg_cmd, sizeof(mode_chg_cmd));
792 if (ret != sizeof(mode_chg_cmd)) {
793 error = ret < 0 ? ret : -EIO;
794 dev_err(&ts->client->dev,
795 "Failed to send %d mode change: %d (%d)\n",
796 mode, error, ret);
797 return error;
798 }
799
800 dev_dbg(&ts->client->dev,
801 "Sent mode change request (mode: %d)\n", mode);
802
803 /* Wait */
804 msleep(1000);
805
806 /* Verify target mode */
807 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
808 if (ret != ARRAY_SIZE(msg)) {
809 error = ret < 0 ? ret : -EIO;
810 dev_err(&ts->client->dev,
811 "Failed to read device mode: %d\n", error);
812 return error;
813 }
814
815 dev_dbg(&ts->client->dev,
816 "Current device mode: %d, want: %d\n", result, mode);
817
818 if (result == mode)
819 return 0;
820
821 } while (--retry);
822
823 return -EIO;
824}
825
826/*
827 * Bootloader - Start bootloader mode
828 */
829static int mip4_bl_enter(struct mip4_ts *ts)
830{
831 return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_BOOT);
832}
833
834/*
835 * Bootloader - Exit bootloader mode
836 */
837static int mip4_bl_exit(struct mip4_ts *ts)
838{
839 return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_APP);
840}
841
842static int mip4_bl_get_address(struct mip4_ts *ts, u16 *buf_addr)
843{
844 u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_BUF_ADDR };
845 u8 result[sizeof(u16)];
846 struct i2c_msg msg[] = {
847 {
848 .addr = ts->client->addr,
849 .flags = 0,
850 .buf = cmd,
851 .len = sizeof(cmd),
852 }, {
853 .addr = ts->client->addr,
854 .flags = I2C_M_RD,
855 .buf = result,
856 .len = sizeof(result),
857 },
858 };
859 int ret;
860 int error;
861
862 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
863 if (ret != ARRAY_SIZE(msg)) {
864 error = ret < 0 ? ret : -EIO;
865 dev_err(&ts->client->dev,
866 "Failed to retrieve bootloader buffer address: %d\n",
867 error);
868 return error;
869 }
870
871 *buf_addr = get_unaligned_le16(result);
872 dev_dbg(&ts->client->dev,
873 "Bootloader buffer address %#04x\n", *buf_addr);
874
875 return 0;
876}
877
878static int mip4_bl_program_page(struct mip4_ts *ts, int offset,
879 const u8 *data, int length, u16 buf_addr)
880{
881 u8 cmd[6];
882 u8 *data_buf;
883 u16 buf_offset;
884 int ret;
885 int error;
886
887 dev_dbg(&ts->client->dev, "Writing page @%#06x (%d)\n",
888 offset, length);
889
890 if (length > MIP4_BL_PAGE_SIZE || length % MIP4_BL_PACKET_SIZE) {
891 dev_err(&ts->client->dev,
892 "Invalid page length: %d\n", length);
893 return -EINVAL;
894 }
895
896 data_buf = kmalloc(2 + MIP4_BL_PACKET_SIZE, GFP_KERNEL);
897 if (!data_buf)
898 return -ENOMEM;
899
900 /* Addr */
901 cmd[0] = MIP4_R0_BOOT;
902 cmd[1] = MIP4_R1_BOOT_TARGET_ADDR;
903 put_unaligned_le32(offset, &cmd[2]);
904 ret = i2c_master_send(ts->client, cmd, 6);
905 if (ret != 6) {
906 error = ret < 0 ? ret : -EIO;
907 dev_err(&ts->client->dev,
908 "Failed to send write page address: %d\n", error);
909 goto out;
910 }
911
912 /* Size */
913 cmd[0] = MIP4_R0_BOOT;
914 cmd[1] = MIP4_R1_BOOT_SIZE;
915 put_unaligned_le32(length, &cmd[2]);
916 ret = i2c_master_send(ts->client, cmd, 6);
917 if (ret != 6) {
918 error = ret < 0 ? ret : -EIO;
919 dev_err(&ts->client->dev,
920 "Failed to send write page size: %d\n", error);
921 goto out;
922 }
923
924 /* Data */
925 for (buf_offset = 0;
926 buf_offset < length;
927 buf_offset += MIP4_BL_PACKET_SIZE) {
928 dev_dbg(&ts->client->dev,
929 "writing chunk at %#04x (size %d)\n",
930 buf_offset, MIP4_BL_PACKET_SIZE);
931 put_unaligned_be16(buf_addr + buf_offset, data_buf);
932 memcpy(&data_buf[2], &data[buf_offset], MIP4_BL_PACKET_SIZE);
933 ret = i2c_master_send(ts->client,
934 data_buf, 2 + MIP4_BL_PACKET_SIZE);
935 if (ret != 2 + MIP4_BL_PACKET_SIZE) {
936 error = ret < 0 ? ret : -EIO;
937 dev_err(&ts->client->dev,
938 "Failed to read chunk at %#04x (size %d): %d\n",
939 buf_offset, MIP4_BL_PACKET_SIZE, error);
940 goto out;
941 }
942 }
943
944 /* Command */
945 cmd[0] = MIP4_R0_BOOT;
946 cmd[1] = MIP4_R1_BOOT_CMD;
947 cmd[2] = MIP4_BOOT_CMD_PROGRAM;
948 ret = i2c_master_send(ts->client, cmd, 3);
949 if (ret != 3) {
950 error = ret < 0 ? ret : -EIO;
951 dev_err(&ts->client->dev,
952 "Failed to send 'write' command: %d\n", error);
953 goto out;
954 }
955
956 /* Status */
957 error = mip4_bl_read_status(ts);
958
959out:
960 kfree(data_buf);
961 return error ? error : 0;
962}
963
964static int mip4_bl_verify_page(struct mip4_ts *ts, int offset,
965 const u8 *data, int length, int buf_addr)
966{
967 u8 cmd[8];
968 u8 *read_buf;
969 int buf_offset;
970 struct i2c_msg msg[] = {
971 {
972 .addr = ts->client->addr,
973 .flags = 0,
974 .buf = cmd,
975 .len = 2,
976 }, {
977 .addr = ts->client->addr,
978 .flags = I2C_M_RD,
979 .len = MIP4_BL_PACKET_SIZE,
980 },
981 };
982 int ret;
983 int error;
984
985 dev_dbg(&ts->client->dev, "Validating page @%#06x (%d)\n",
986 offset, length);
987
988 /* Addr */
989 cmd[0] = MIP4_R0_BOOT;
990 cmd[1] = MIP4_R1_BOOT_TARGET_ADDR;
991 put_unaligned_le32(offset, &cmd[2]);
992 ret = i2c_master_send(ts->client, cmd, 6);
993 if (ret != 6) {
994 error = ret < 0 ? ret : -EIO;
995 dev_err(&ts->client->dev,
996 "Failed to send read page address: %d\n", error);
997 return error;
998 }
999
1000 /* Size */
1001 cmd[0] = MIP4_R0_BOOT;
1002 cmd[1] = MIP4_R1_BOOT_SIZE;
1003 put_unaligned_le32(length, &cmd[2]);
1004 ret = i2c_master_send(ts->client, cmd, 6);
1005 if (ret != 6) {
1006 error = ret < 0 ? ret : -EIO;
1007 dev_err(&ts->client->dev,
1008 "Failed to send read page size: %d\n", error);
1009 return error;
1010 }
1011
1012 /* Command */
1013 cmd[0] = MIP4_R0_BOOT;
1014 cmd[1] = MIP4_R1_BOOT_CMD;
1015 cmd[2] = MIP4_BOOT_CMD_READ;
1016 ret = i2c_master_send(ts->client, cmd, 3);
1017 if (ret != 3) {
1018 error = ret < 0 ? ret : -EIO;
1019 dev_err(&ts->client->dev,
1020 "Failed to send 'read' command: %d\n", error);
1021 return error;
1022 }
1023
1024 /* Status */
1025 error = mip4_bl_read_status(ts);
1026 if (error)
1027 return error;
1028
1029 /* Read */
1030 msg[1].buf = read_buf = kmalloc(MIP4_BL_PACKET_SIZE, GFP_KERNEL);
1031 if (!read_buf)
1032 return -ENOMEM;
1033
1034 for (buf_offset = 0;
1035 buf_offset < length;
1036 buf_offset += MIP4_BL_PACKET_SIZE) {
1037 dev_dbg(&ts->client->dev,
1038 "reading chunk at %#04x (size %d)\n",
1039 buf_offset, MIP4_BL_PACKET_SIZE);
1040 put_unaligned_be16(buf_addr + buf_offset, cmd);
1041 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
1042 if (ret != ARRAY_SIZE(msg)) {
1043 error = ret < 0 ? ret : -EIO;
1044 dev_err(&ts->client->dev,
1045 "Failed to read chunk at %#04x (size %d): %d\n",
1046 buf_offset, MIP4_BL_PACKET_SIZE, error);
1047 break;
1048 }
1049
1050 if (memcmp(&data[buf_offset], read_buf, MIP4_BL_PACKET_SIZE)) {
1051 dev_err(&ts->client->dev,
1052 "Failed to validate chunk at %#04x (size %d)\n",
1053 buf_offset, MIP4_BL_PACKET_SIZE);
1054#if MIP4_FW_UPDATE_DEBUG
1055 print_hex_dump(KERN_DEBUG,
1056 MIP4_DEVICE_NAME " F/W File: ",
1057 DUMP_PREFIX_OFFSET, 16, 1,
1058 data + offset, MIP4_BL_PACKET_SIZE,
1059 false);
1060 print_hex_dump(KERN_DEBUG,
1061 MIP4_DEVICE_NAME " F/W Chip: ",
1062 DUMP_PREFIX_OFFSET, 16, 1,
1063 read_buf, MIP4_BL_PAGE_SIZE, false);
1064#endif
1065 error = -EINVAL;
1066 break;
1067 }
1068 }
1069
1070 kfree(read_buf);
1071 return error ? error : 0;
1072}
1073
1074/*
1075 * Flash chip firmware
1076 */
1077static int mip4_flash_fw(struct mip4_ts *ts,
1078 const u8 *fw_data, u32 fw_size, u32 fw_offset)
1079{
1080 struct i2c_client *client = ts->client;
1081 int offset;
1082 u16 buf_addr;
1083 int error, error2;
1084
1085 /* Enter bootloader mode */
1086 dev_dbg(&client->dev, "Entering bootloader mode\n");
1087
1088 error = mip4_bl_enter(ts);
1089 if (error) {
1090 dev_err(&client->dev,
1091 "Failed to enter bootloader mode: %d\n",
1092 error);
1093 return error;
1094 }
1095
1096 /* Read info */
1097 error = mip4_bl_get_address(ts, &buf_addr);
1098 if (error)
1099 goto exit_bl;
1100
1101 /* Program & Verify */
1102 dev_dbg(&client->dev,
1103 "Program & Verify, page size: %d, packet size: %d\n",
1104 MIP4_BL_PAGE_SIZE, MIP4_BL_PACKET_SIZE);
1105
1106 for (offset = fw_offset;
1107 offset < fw_offset + fw_size;
1108 offset += MIP4_BL_PAGE_SIZE) {
1109 /* Program */
1110 error = mip4_bl_program_page(ts, offset, fw_data + offset,
1111 MIP4_BL_PAGE_SIZE, buf_addr);
1112 if (error)
1113 break;
1114
1115 /* Verify */
1116 error = mip4_bl_verify_page(ts, offset, fw_data + offset,
1117 MIP4_BL_PAGE_SIZE, buf_addr);
1118 if (error)
1119 break;
1120 }
1121
1122exit_bl:
1123 /* Exit bootloader mode */
1124 dev_dbg(&client->dev, "Exiting bootloader mode\n");
1125
1126 error2 = mip4_bl_exit(ts);
1127 if (error2) {
1128 dev_err(&client->dev,
1129 "Failed to exit bootloader mode: %d\n", error2);
1130 if (!error)
1131 error = error2;
1132 }
1133
1134 /* Reset chip */
1135 mip4_power_off(ts);
1136 mip4_power_on(ts);
1137
1138 mip4_query_device(ts);
1139
1140 /* Refresh device parameters */
1141 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
1142 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
1143 input_set_abs_params(ts->input, ABS_X, 0, ts->max_x, 0, 0);
1144 input_set_abs_params(ts->input, ABS_Y, 0, ts->max_y, 0, 0);
1145 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
1146 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
1147 input_abs_set_res(ts->input, ABS_X, ts->ppm_x);
1148 input_abs_set_res(ts->input, ABS_Y, ts->ppm_y);
1149
1150 return error ? error : 0;
1151}
1152
1153static int mip4_parse_firmware(struct mip4_ts *ts, const struct firmware *fw,
1154 u32 *fw_offset_start, u32 *fw_size,
1155 const struct mip4_bin_tail **pfw_info)
1156{
1157 const struct mip4_bin_tail *fw_info;
1158 struct mip4_fw_version fw_version;
1159 u16 tail_size;
1160
1161 if (fw->size < MIP4_BIN_TAIL_SIZE) {
1162 dev_err(&ts->client->dev,
1163 "Invalid firmware, size mismatch (tail %zd vs %zd)\n",
1164 MIP4_BIN_TAIL_SIZE, fw->size);
1165 return -EINVAL;
1166 }
1167
1168 fw_info = (const void *)&fw->data[fw->size - MIP4_BIN_TAIL_SIZE];
1169
1170#if MIP4_FW_UPDATE_DEBUG
1171 print_hex_dump(KERN_ERR, MIP4_DEVICE_NAME " Bin Info: ",
1172 DUMP_PREFIX_OFFSET, 16, 1, *fw_info, tail_size, false);
1173#endif
1174
1175 tail_size = get_unaligned_le16(&fw_info->tail_size);
1176 if (tail_size != MIP4_BIN_TAIL_SIZE) {
1177 dev_err(&ts->client->dev,
1178 "wrong tail size: %d (expected %zd)\n",
1179 tail_size, MIP4_BIN_TAIL_SIZE);
1180 return -EINVAL;
1181 }
1182
1183 /* Check bin format */
1184 if (memcmp(fw_info->tail_mark, MIP4_BIN_TAIL_MARK,
1185 sizeof(fw_info->tail_mark))) {
1186 dev_err(&ts->client->dev,
1187 "unable to locate tail marker (%*ph vs %*ph)\n",
1188 (int)sizeof(fw_info->tail_mark), fw_info->tail_mark,
1189 (int)sizeof(fw_info->tail_mark), MIP4_BIN_TAIL_MARK);
1190 return -EINVAL;
1191 }
1192
1193 *fw_offset_start = get_unaligned_le32(&fw_info->bin_start_addr);
1194 *fw_size = get_unaligned_le32(&fw_info->bin_length);
1195
1196 dev_dbg(&ts->client->dev,
1197 "F/W Data offset: %#08x, size: %d\n",
1198 *fw_offset_start, *fw_size);
1199
1200 if (*fw_size % MIP4_BL_PAGE_SIZE) {
1201 dev_err(&ts->client->dev,
1202 "encoded fw length %d is not multiple of pages (%d)\n",
1203 *fw_size, MIP4_BL_PAGE_SIZE);
1204 return -EINVAL;
1205 }
1206
1207 if (fw->size != *fw_offset_start + *fw_size) {
1208 dev_err(&ts->client->dev,
1209 "Wrong firmware size, expected %d bytes, got %zd\n",
1210 *fw_offset_start + *fw_size, fw->size);
1211 return -EINVAL;
1212 }
1213
1214 mip4_parse_fw_version((const u8 *)&fw_info->ver_boot, &fw_version);
1215
1216 dev_dbg(&ts->client->dev,
1217 "F/W file version %04X %04X %04X %04X\n",
1218 fw_version.boot, fw_version.core,
1219 fw_version.app, fw_version.param);
1220
1221 dev_dbg(&ts->client->dev, "F/W chip version: %04X %04X %04X %04X\n",
1222 ts->fw_version.boot, ts->fw_version.core,
1223 ts->fw_version.app, ts->fw_version.param);
1224
1225 /* Check F/W type */
1226 if (fw_version.boot != 0xEEEE && fw_version.boot != 0xFFFF &&
1227 fw_version.core == 0xEEEE &&
1228 fw_version.app == 0xEEEE &&
1229 fw_version.param == 0xEEEE) {
1230 dev_dbg(&ts->client->dev, "F/W type: Bootloader\n");
1231 } else if (fw_version.boot == 0xEEEE &&
1232 fw_version.core != 0xEEEE && fw_version.core != 0xFFFF &&
1233 fw_version.app != 0xEEEE && fw_version.app != 0xFFFF &&
1234 fw_version.param != 0xEEEE && fw_version.param != 0xFFFF) {
1235 dev_dbg(&ts->client->dev, "F/W type: Main\n");
1236 } else {
1237 dev_err(&ts->client->dev, "Wrong firmware type\n");
1238 return -EINVAL;
1239 }
1240
1241 return 0;
1242}
1243
1244static int mip4_execute_fw_update(struct mip4_ts *ts, const struct firmware *fw)
1245{
1246 const struct mip4_bin_tail *fw_info;
1247 u32 fw_start_offset;
1248 u32 fw_size;
1249 int retires = 3;
1250 int error;
1251
1252 error = mip4_parse_firmware(ts, fw,
1253 &fw_start_offset, &fw_size, &fw_info);
1254 if (error)
1255 return error;
1256
1257 if (ts->input->users) {
1258 disable_irq(ts->client->irq);
1259 } else {
1260 error = mip4_power_on(ts);
1261 if (error)
1262 return error;
1263 }
1264
1265 /* Update firmware */
1266 do {
1267 error = mip4_flash_fw(ts, fw->data, fw_size, fw_start_offset);
1268 if (!error)
1269 break;
1270 } while (--retires);
1271
1272 if (error)
1273 dev_err(&ts->client->dev,
1274 "Failed to flash firmware: %d\n", error);
1275
1276 /* Enable IRQ */
1277 if (ts->input->users)
1278 enable_irq(ts->client->irq);
1279 else
1280 mip4_power_off(ts);
1281
1282 return error ? error : 0;
1283}
1284
1285static ssize_t mip4_sysfs_fw_update(struct device *dev,
1286 struct device_attribute *attr,
1287 const char *buf, size_t count)
1288{
1289 struct i2c_client *client = to_i2c_client(dev);
1290 struct mip4_ts *ts = i2c_get_clientdata(client);
1291 const struct firmware *fw;
1292 int error;
1293
1294 error = request_firmware(&fw, ts->fw_name, dev);
1295 if (error) {
1296 dev_err(&ts->client->dev,
1297 "Failed to retrieve firmware %s: %d\n",
1298 ts->fw_name, error);
1299 return error;
1300 }
1301
1302 /*
1303 * Take input mutex to prevent racing with itself and also with
1304 * userspace opening and closing the device and also suspend/resume
1305 * transitions.
1306 */
1307 mutex_lock(&ts->input->mutex);
1308
1309 error = mip4_execute_fw_update(ts, fw);
1310
1311 mutex_unlock(&ts->input->mutex);
1312
1313 release_firmware(fw);
1314
1315 if (error) {
1316 dev_err(&ts->client->dev,
1317 "Firmware update failed: %d\n", error);
1318 return error;
1319 }
1320
1321 return count;
1322}
1323
1324static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mip4_sysfs_fw_update);
1325
1326static ssize_t mip4_sysfs_read_fw_version(struct device *dev,
1327 struct device_attribute *attr,
1328 char *buf)
1329{
1330 struct i2c_client *client = to_i2c_client(dev);
1331 struct mip4_ts *ts = i2c_get_clientdata(client);
1332 size_t count;
1333
1334 /* Take lock to prevent racing with firmware update */
1335 mutex_lock(&ts->input->mutex);
1336
1337 count = snprintf(buf, PAGE_SIZE, "%04X %04X %04X %04X\n",
1338 ts->fw_version.boot, ts->fw_version.core,
1339 ts->fw_version.app, ts->fw_version.param);
1340
1341 mutex_unlock(&ts->input->mutex);
1342
1343 return count;
1344}
1345
1346static DEVICE_ATTR(fw_version, S_IRUGO, mip4_sysfs_read_fw_version, NULL);
1347
1348static ssize_t mip4_sysfs_read_hw_version(struct device *dev,
1349 struct device_attribute *attr,
1350 char *buf)
1351{
1352 struct i2c_client *client = to_i2c_client(dev);
1353 struct mip4_ts *ts = i2c_get_clientdata(client);
1354 size_t count;
1355
1356 /* Take lock to prevent racing with firmware update */
1357 mutex_lock(&ts->input->mutex);
1358
1359 /*
1360 * product_name shows the name or version of the hardware
1361 * paired with current firmware in the chip.
1362 */
1363 count = snprintf(buf, PAGE_SIZE, "%.*s\n",
1364 (int)sizeof(ts->product_name), ts->product_name);
1365
1366 mutex_unlock(&ts->input->mutex);
1367
1368 return count;
1369}
1370
1371static DEVICE_ATTR(hw_version, S_IRUGO, mip4_sysfs_read_hw_version, NULL);
1372
1373static ssize_t mip4_sysfs_read_product_id(struct device *dev,
1374 struct device_attribute *attr,
1375 char *buf)
1376{
1377 struct i2c_client *client = to_i2c_client(dev);
1378 struct mip4_ts *ts = i2c_get_clientdata(client);
1379 size_t count;
1380
1381 mutex_lock(&ts->input->mutex);
1382
1383 count = snprintf(buf, PAGE_SIZE, "%04X\n", ts->product_id);
1384
1385 mutex_unlock(&ts->input->mutex);
1386
1387 return count;
1388}
1389
1390static DEVICE_ATTR(product_id, S_IRUGO, mip4_sysfs_read_product_id, NULL);
1391
1392static ssize_t mip4_sysfs_read_ic_name(struct device *dev,
1393 struct device_attribute *attr,
1394 char *buf)
1395{
1396 struct i2c_client *client = to_i2c_client(dev);
1397 struct mip4_ts *ts = i2c_get_clientdata(client);
1398 size_t count;
1399
1400 mutex_lock(&ts->input->mutex);
1401
1402 count = snprintf(buf, PAGE_SIZE, "%.*s\n",
1403 (int)sizeof(ts->ic_name), ts->ic_name);
1404
1405 mutex_unlock(&ts->input->mutex);
1406
1407 return count;
1408}
1409
1410static DEVICE_ATTR(ic_name, S_IRUGO, mip4_sysfs_read_ic_name, NULL);
1411
1412static struct attribute *mip4_attrs[] = {
1413 &dev_attr_fw_version.attr,
1414 &dev_attr_hw_version.attr,
1415 &dev_attr_product_id.attr,
1416 &dev_attr_ic_name.attr,
1417 &dev_attr_update_fw.attr,
1418 NULL,
1419};
1420
1421static const struct attribute_group mip4_attr_group = {
1422 .attrs = mip4_attrs,
1423};
1424
1425static void mip4_sysfs_remove(void *_data)
1426{
1427 struct mip4_ts *ts = _data;
1428
1429 sysfs_remove_group(&ts->client->dev.kobj, &mip4_attr_group);
1430}
1431
1432static int mip4_probe(struct i2c_client *client, const struct i2c_device_id *id)
1433{
1434 struct mip4_ts *ts;
1435 struct input_dev *input;
1436 int error;
1437
1438 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1439 dev_err(&client->dev, "Not supported I2C adapter\n");
1440 return -ENXIO;
1441 }
1442
1443 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1444 if (!ts)
1445 return -ENOMEM;
1446
1447 input = devm_input_allocate_device(&client->dev);
1448 if (!input)
1449 return -ENOMEM;
1450
1451 ts->client = client;
1452 ts->input = input;
1453
1454 snprintf(ts->phys, sizeof(ts->phys),
1455 "%s/input0", dev_name(&client->dev));
1456
1457 ts->gpio_ce = devm_gpiod_get_optional(&client->dev,
1458 "ce", GPIOD_OUT_LOW);
1459 if (IS_ERR(ts->gpio_ce)) {
1460 error = PTR_ERR(ts->gpio_ce);
1461 if (error != EPROBE_DEFER)
1462 dev_err(&client->dev,
1463 "Failed to get gpio: %d\n", error);
1464 return error;
1465 }
1466
1467 error = mip4_power_on(ts);
1468 if (error)
1469 return error;
1470 error = mip4_query_device(ts);
1471 mip4_power_off(ts);
1472 if (error)
1473 return error;
1474
1475 input->name = "MELFAS MIP4 Touchscreen";
1476 input->phys = ts->phys;
1477
1478 input->id.bustype = BUS_I2C;
1479 input->id.vendor = 0x13c5;
1480 input->id.product = ts->product_id;
1481
1482 input->open = mip4_input_open;
1483 input->close = mip4_input_close;
1484
1485 input_set_drvdata(input, ts);
1486
1487 input->keycode = ts->key_code;
1488 input->keycodesize = sizeof(*ts->key_code);
1489 input->keycodemax = ts->key_num;
1490
1491 input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
1492 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
1493 input_set_abs_params(input, ABS_MT_PRESSURE,
1494 MIP4_PRESSURE_MIN, MIP4_PRESSURE_MAX, 0, 0);
1495 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1496 MIP4_TOUCH_MAJOR_MIN, MIP4_TOUCH_MAJOR_MAX, 0, 0);
1497 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1498 MIP4_TOUCH_MINOR_MIN, MIP4_TOUCH_MINOR_MAX, 0, 0);
1499 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
1500 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
1501
1502 error = input_mt_init_slots(input, MIP4_MAX_FINGERS, INPUT_MT_DIRECT);
1503 if (error)
1504 return error;
1505
1506 i2c_set_clientdata(client, ts);
1507
1508 error = devm_request_threaded_irq(&client->dev, client->irq,
1509 NULL, mip4_interrupt,
1510 IRQF_ONESHOT, MIP4_DEVICE_NAME, ts);
1511 if (error) {
1512 dev_err(&client->dev,
1513 "Failed to request interrupt %d: %d\n",
1514 client->irq, error);
1515 return error;
1516 }
1517
1518 disable_irq(client->irq);
1519
1520 error = input_register_device(input);
1521 if (error) {
1522 dev_err(&client->dev,
1523 "Failed to register input device: %d\n", error);
1524 return error;
1525 }
1526
1527 error = sysfs_create_group(&client->dev.kobj, &mip4_attr_group);
1528 if (error) {
1529 dev_err(&client->dev,
1530 "Failed to create sysfs attribute group: %d\n", error);
1531 return error;
1532 }
1533
1534 error = devm_add_action(&client->dev, mip4_sysfs_remove, ts);
1535 if (error) {
1536 mip4_sysfs_remove(ts);
1537 dev_err(&client->dev,
1538 "Failed to install sysfs remoce action: %d\n", error);
1539 return error;
1540 }
1541
1542 return 0;
1543}
1544
1545static int __maybe_unused mip4_suspend(struct device *dev)
1546{
1547 struct i2c_client *client = to_i2c_client(dev);
1548 struct mip4_ts *ts = i2c_get_clientdata(client);
1549 struct input_dev *input = ts->input;
1550
1551 mutex_lock(&input->mutex);
1552
1553 if (device_may_wakeup(dev))
1554 ts->wake_irq_enabled = enable_irq_wake(client->irq) == 0;
1555 else if (input->users)
1556 mip4_disable(ts);
1557
1558 mutex_unlock(&input->mutex);
1559
1560 return 0;
1561}
1562
1563static int __maybe_unused mip4_resume(struct device *dev)
1564{
1565 struct i2c_client *client = to_i2c_client(dev);
1566 struct mip4_ts *ts = i2c_get_clientdata(client);
1567 struct input_dev *input = ts->input;
1568
1569 mutex_lock(&input->mutex);
1570
1571 if (ts->wake_irq_enabled)
1572 disable_irq_wake(client->irq);
1573 else if (input->users)
1574 mip4_enable(ts);
1575
1576 mutex_unlock(&input->mutex);
1577
1578 return 0;
1579}
1580
1581static SIMPLE_DEV_PM_OPS(mip4_pm_ops, mip4_suspend, mip4_resume);
1582
1583#ifdef CONFIG_OF
1584static const struct of_device_id mip4_of_match[] = {
1585 { .compatible = "melfas,"MIP4_DEVICE_NAME, },
1586 { },
1587};
1588MODULE_DEVICE_TABLE(of, mip4_of_match);
1589#endif
1590
1591#ifdef CONFIG_ACPI
1592static const struct acpi_device_id mip4_acpi_match[] = {
1593 { "MLFS0000", 0},
1594 { },
1595};
1596MODULE_DEVICE_TABLE(acpi, mip4_acpi_match);
1597#endif
1598
1599static const struct i2c_device_id mip4_i2c_ids[] = {
1600 { MIP4_DEVICE_NAME, 0 },
1601 { },
1602};
1603MODULE_DEVICE_TABLE(i2c, mip4_i2c_ids);
1604
1605static struct i2c_driver mip4_driver = {
1606 .id_table = mip4_i2c_ids,
1607 .probe = mip4_probe,
1608 .driver = {
1609 .name = MIP4_DEVICE_NAME,
1610 .of_match_table = of_match_ptr(mip4_of_match),
1611 .acpi_match_table = ACPI_PTR(mip4_acpi_match),
1612 .pm = &mip4_pm_ops,
1613 },
1614};
1615module_i2c_driver(mip4_driver);
1616
1617MODULE_DESCRIPTION("MELFAS MIP4 Touchscreen");
1618MODULE_VERSION("2016.10.31");
1619MODULE_AUTHOR("Sangwon Jee <jeesw@melfas.com>");
1620MODULE_LICENSE("GPL");