1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Raydium touchscreen I2C driver.
4  *
5  * Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
6  *
7  * Raydium reserves the right to make changes without further notice
8  * to the materials described herein. Raydium does not assume any
9  * liability arising out of the application described herein.
10  *
11  * Contact Raydium Semiconductor Corporation at www.rad-ic.com
12  */
13 
14 #include <linux/acpi.h>
15 #include <linux/delay.h>
16 #include <linux/firmware.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/i2c.h>
19 #include <linux/input.h>
20 #include <linux/input/mt.h>
21 #include <linux/interrupt.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/pm_wakeirq.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/slab.h>
27 #include <asm/unaligned.h>
28 
29 /* Slave I2C mode */
30 #define RM_BOOT_BLDR		0x02
31 #define RM_BOOT_MAIN		0x03
32 
33 /* I2C bootoloader commands */
34 #define RM_CMD_BOOT_PAGE_WRT	0x0B		/* send bl page write */
35 #define RM_CMD_BOOT_WRT		0x11		/* send bl write */
36 #define RM_CMD_BOOT_ACK		0x22		/* send ack*/
37 #define RM_CMD_BOOT_CHK		0x33		/* send data check */
38 #define RM_CMD_BOOT_READ	0x44		/* send wait bl data ready*/
39 
40 #define RM_BOOT_RDY		0xFF		/* bl data ready */
41 #define RM_BOOT_CMD_READHWID	0x0E		/* read hwid */
42 
43 /* I2C main commands */
44 #define RM_CMD_QUERY_BANK	0x2B
45 #define RM_CMD_DATA_BANK	0x4D
46 #define RM_CMD_ENTER_SLEEP	0x4E
47 #define RM_CMD_BANK_SWITCH	0xAA
48 
49 #define RM_RESET_MSG_ADDR	0x40000004
50 
51 #define RM_MAX_READ_SIZE	56
52 #define RM_PACKET_CRC_SIZE	2
53 
54 /* Touch relative info */
55 #define RM_MAX_RETRIES		3
56 #define RM_RETRY_DELAY_MS	20
57 #define RM_MAX_TOUCH_NUM	10
58 #define RM_BOOT_DELAY_MS	100
59 
60 /* Offsets in contact data */
61 #define RM_CONTACT_STATE_POS	0
62 #define RM_CONTACT_X_POS	1
63 #define RM_CONTACT_Y_POS	3
64 #define RM_CONTACT_PRESSURE_POS	5
65 #define RM_CONTACT_WIDTH_X_POS	6
66 #define RM_CONTACT_WIDTH_Y_POS	7
67 
68 /* Bootloader relative info */
69 #define RM_BL_WRT_CMD_SIZE	3	/* bl flash wrt cmd size */
70 #define RM_BL_WRT_PKG_SIZE	32	/* bl wrt pkg size */
71 #define RM_BL_WRT_LEN		(RM_BL_WRT_PKG_SIZE + RM_BL_WRT_CMD_SIZE)
72 #define RM_FW_PAGE_SIZE		128
73 #define RM_MAX_FW_RETRIES	30
74 #define RM_MAX_FW_SIZE		0xD000
75 
76 #define RM_POWERON_DELAY_USEC	500
77 #define RM_RESET_DELAY_MSEC	50
78 
79 enum raydium_bl_cmd {
80 	BL_HEADER = 0,
81 	BL_PAGE_STR,
82 	BL_PKG_IDX,
83 	BL_DATA_STR,
84 };
85 
86 enum raydium_bl_ack {
87 	RAYDIUM_ACK_NULL = 0,
88 	RAYDIUM_WAIT_READY,
89 	RAYDIUM_PATH_READY,
90 };
91 
92 enum raydium_boot_mode {
93 	RAYDIUM_TS_MAIN = 0,
94 	RAYDIUM_TS_BLDR,
95 };
96 
97 /* Response to RM_CMD_DATA_BANK request */
98 struct raydium_data_info {
99 	__le32 data_bank_addr;
100 	u8 pkg_size;
101 	u8 tp_info_size;
102 };
103 
104 struct raydium_info {
105 	__le32 hw_ver;		/*device version */
106 	u8 main_ver;
107 	u8 sub_ver;
108 	__le16 ft_ver;		/* test version */
109 	u8 x_num;
110 	u8 y_num;
111 	__le16 x_max;
112 	__le16 y_max;
113 	u8 x_res;		/* units/mm */
114 	u8 y_res;		/* units/mm */
115 };
116 
117 /* struct raydium_data - represents state of Raydium touchscreen device */
118 struct raydium_data {
119 	struct i2c_client *client;
120 	struct input_dev *input;
121 
122 	struct regulator *avdd;
123 	struct regulator *vccio;
124 	struct gpio_desc *reset_gpio;
125 
126 	struct raydium_info info;
127 
128 	struct mutex sysfs_mutex;
129 
130 	u8 *report_data;
131 
132 	u32 data_bank_addr;
133 	u8 report_size;
134 	u8 contact_size;
135 	u8 pkg_size;
136 
137 	enum raydium_boot_mode boot_mode;
138 };
139 
140 /*
141  * Header to be sent for RM_CMD_BANK_SWITCH command. This is used by
142  * raydium_i2c_{read|send} below.
143  */
144 struct __packed raydium_bank_switch_header {
145 	u8 cmd;
146 	__be32 be_addr;
147 };
148 
149 static int raydium_i2c_xfer(struct i2c_client *client, u32 addr,
150 			    struct i2c_msg *xfer, size_t xfer_count)
151 {
152 	int ret;
153 	/*
154 	 * If address is greater than 255, then RM_CMD_BANK_SWITCH needs to be
155 	 * sent first. Else, skip the header i.e. xfer[0].
156 	 */
157 	int xfer_start_idx = (addr > 0xff) ? 0 : 1;
158 	xfer_count -= xfer_start_idx;
159 
160 	ret = i2c_transfer(client->adapter, &xfer[xfer_start_idx], xfer_count);
161 	if (likely(ret == xfer_count))
162 		return 0;
163 
164 	return ret < 0 ? ret : -EIO;
165 }
166 
167 static int raydium_i2c_send(struct i2c_client *client,
168 			    u32 addr, const void *data, size_t len)
169 {
170 	int tries = 0;
171 	int error;
172 	u8 *tx_buf;
173 	u8 reg_addr = addr & 0xff;
174 
175 	tx_buf = kmalloc(len + 1, GFP_KERNEL);
176 	if (!tx_buf)
177 		return -ENOMEM;
178 
179 	tx_buf[0] = reg_addr;
180 	memcpy(tx_buf + 1, data, len);
181 
182 	do {
183 		struct raydium_bank_switch_header header = {
184 			.cmd = RM_CMD_BANK_SWITCH,
185 			.be_addr = cpu_to_be32(addr),
186 		};
187 
188 		/*
189 		 * Perform as a single i2c_transfer transaction to ensure that
190 		 * no other I2C transactions are initiated on the bus to any
191 		 * other device in between. Initiating transacations to other
192 		 * devices after RM_CMD_BANK_SWITCH is sent is known to cause
193 		 * issues. This is also why regmap infrastructure cannot be used
194 		 * for this driver. Regmap handles page(bank) switch and reads
195 		 * as separate i2c_transfer() operations. This can result in
196 		 * problems if the Raydium device is on a shared I2C bus.
197 		 */
198 		struct i2c_msg xfer[] = {
199 			{
200 				.addr = client->addr,
201 				.len = sizeof(header),
202 				.buf = (u8 *)&header,
203 			},
204 			{
205 				.addr = client->addr,
206 				.len = len + 1,
207 				.buf = tx_buf,
208 			},
209 		};
210 
211 		error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
212 		if (likely(!error))
213 			goto out;
214 
215 		msleep(RM_RETRY_DELAY_MS);
216 	} while (++tries < RM_MAX_RETRIES);
217 
218 	dev_err(&client->dev, "%s failed: %d\n", __func__, error);
219 out:
220 	kfree(tx_buf);
221 	return error;
222 }
223 
224 static int raydium_i2c_read(struct i2c_client *client,
225 			    u32 addr, void *data, size_t len)
226 {
227 	int error;
228 
229 	while (len) {
230 		u8 reg_addr = addr & 0xff;
231 		struct raydium_bank_switch_header header = {
232 			.cmd = RM_CMD_BANK_SWITCH,
233 			.be_addr = cpu_to_be32(addr),
234 		};
235 		size_t xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
236 
237 		/*
238 		 * Perform as a single i2c_transfer transaction to ensure that
239 		 * no other I2C transactions are initiated on the bus to any
240 		 * other device in between. Initiating transacations to other
241 		 * devices after RM_CMD_BANK_SWITCH is sent is known to cause
242 		 * issues. This is also why regmap infrastructure cannot be used
243 		 * for this driver. Regmap handles page(bank) switch and writes
244 		 * as separate i2c_transfer() operations. This can result in
245 		 * problems if the Raydium device is on a shared I2C bus.
246 		 */
247 		struct i2c_msg xfer[] = {
248 			{
249 				.addr = client->addr,
250 				.len = sizeof(header),
251 				.buf = (u8 *)&header,
252 			},
253 			{
254 				.addr = client->addr,
255 				.len = 1,
256 				.buf = &reg_addr,
257 			},
258 			{
259 				.addr = client->addr,
260 				.len = xfer_len,
261 				.buf = data,
262 				.flags = I2C_M_RD,
263 			}
264 		};
265 
266 		error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
267 		if (unlikely(error))
268 			return error;
269 
270 		len -= xfer_len;
271 		data += xfer_len;
272 		addr += xfer_len;
273 	}
274 
275 	return 0;
276 }
277 
278 static int raydium_i2c_sw_reset(struct i2c_client *client)
279 {
280 	const u8 soft_rst_cmd = 0x01;
281 	int error;
282 
283 	error = raydium_i2c_send(client, RM_RESET_MSG_ADDR, &soft_rst_cmd,
284 				 sizeof(soft_rst_cmd));
285 	if (error) {
286 		dev_err(&client->dev, "software reset failed: %d\n", error);
287 		return error;
288 	}
289 
290 	msleep(RM_RESET_DELAY_MSEC);
291 
292 	return 0;
293 }
294 
295 static int raydium_i2c_query_ts_bootloader_info(struct raydium_data *ts)
296 {
297 	struct i2c_client *client = ts->client;
298 	static const u8 get_hwid[] = { RM_BOOT_CMD_READHWID,
299 				       0x10, 0xc0, 0x01, 0x00, 0x04, 0x00 };
300 	u8 rbuf[5] = { 0 };
301 	u32 hw_ver;
302 	int error;
303 
304 	error = raydium_i2c_send(client, RM_CMD_BOOT_WRT,
305 				 get_hwid, sizeof(get_hwid));
306 	if (error) {
307 		dev_err(&client->dev, "WRT HWID command failed: %d\n", error);
308 		return error;
309 	}
310 
311 	error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, rbuf, 1);
312 	if (error) {
313 		dev_err(&client->dev, "Ack HWID command failed: %d\n", error);
314 		return error;
315 	}
316 
317 	error = raydium_i2c_read(client, RM_CMD_BOOT_CHK, rbuf, sizeof(rbuf));
318 	if (error) {
319 		dev_err(&client->dev, "Read HWID command failed: %d (%4ph)\n",
320 			error, rbuf + 1);
321 		hw_ver = 0xffffffffUL;
322 	} else {
323 		hw_ver = get_unaligned_be32(rbuf + 1);
324 	}
325 
326 	ts->info.hw_ver = cpu_to_le32(hw_ver);
327 	ts->info.main_ver = 0xff;
328 	ts->info.sub_ver = 0xff;
329 
330 	return error;
331 }
332 
333 static int raydium_i2c_query_ts_info(struct raydium_data *ts)
334 {
335 	struct i2c_client *client = ts->client;
336 	struct raydium_data_info data_info;
337 	__le32 query_bank_addr;
338 
339 	int error, retry_cnt;
340 
341 	for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
342 		error = raydium_i2c_read(client, RM_CMD_DATA_BANK,
343 					 &data_info, sizeof(data_info));
344 		if (error)
345 			continue;
346 
347 		/*
348 		 * Warn user if we already allocated memory for reports and
349 		 * then the size changed (due to firmware update?) and keep
350 		 * old size instead.
351 		 */
352 		if (ts->report_data && ts->pkg_size != data_info.pkg_size) {
353 			dev_warn(&client->dev,
354 				 "report size changes, was: %d, new: %d\n",
355 				 ts->pkg_size, data_info.pkg_size);
356 		} else {
357 			ts->pkg_size = data_info.pkg_size;
358 			ts->report_size = ts->pkg_size - RM_PACKET_CRC_SIZE;
359 		}
360 
361 		ts->contact_size = data_info.tp_info_size;
362 		ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
363 
364 		dev_dbg(&client->dev,
365 			"data_bank_addr: %#08x, report_size: %d, contact_size: %d\n",
366 			ts->data_bank_addr, ts->report_size, ts->contact_size);
367 
368 		error = raydium_i2c_read(client, RM_CMD_QUERY_BANK,
369 					 &query_bank_addr,
370 					 sizeof(query_bank_addr));
371 		if (error)
372 			continue;
373 
374 		error = raydium_i2c_read(client, le32_to_cpu(query_bank_addr),
375 					 &ts->info, sizeof(ts->info));
376 		if (error)
377 			continue;
378 
379 		return 0;
380 	}
381 
382 	dev_err(&client->dev, "failed to query device parameters: %d\n", error);
383 	return error;
384 }
385 
386 static int raydium_i2c_check_fw_status(struct raydium_data *ts)
387 {
388 	struct i2c_client *client = ts->client;
389 	static const u8 bl_ack = 0x62;
390 	static const u8 main_ack = 0x66;
391 	u8 buf[4];
392 	int error;
393 
394 	error = raydium_i2c_read(client, RM_CMD_BOOT_READ, buf, sizeof(buf));
395 	if (!error) {
396 		if (buf[0] == bl_ack)
397 			ts->boot_mode = RAYDIUM_TS_BLDR;
398 		else if (buf[0] == main_ack)
399 			ts->boot_mode = RAYDIUM_TS_MAIN;
400 		return 0;
401 	}
402 
403 	return error;
404 }
405 
406 static int raydium_i2c_initialize(struct raydium_data *ts)
407 {
408 	struct i2c_client *client = ts->client;
409 	int error, retry_cnt;
410 
411 	for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
412 		/* Wait for Hello packet */
413 		msleep(RM_BOOT_DELAY_MS);
414 
415 		error = raydium_i2c_check_fw_status(ts);
416 		if (error) {
417 			dev_err(&client->dev,
418 				"failed to read 'hello' packet: %d\n", error);
419 			continue;
420 		}
421 
422 		if (ts->boot_mode == RAYDIUM_TS_BLDR ||
423 		    ts->boot_mode == RAYDIUM_TS_MAIN) {
424 			break;
425 		}
426 	}
427 
428 	if (error)
429 		ts->boot_mode = RAYDIUM_TS_BLDR;
430 
431 	if (ts->boot_mode == RAYDIUM_TS_BLDR)
432 		raydium_i2c_query_ts_bootloader_info(ts);
433 	else
434 		raydium_i2c_query_ts_info(ts);
435 
436 	return error;
437 }
438 
439 static int raydium_i2c_bl_chk_state(struct i2c_client *client,
440 				    enum raydium_bl_ack state)
441 {
442 	static const u8 ack_ok[] = { 0xFF, 0x39, 0x30, 0x30, 0x54 };
443 	u8 rbuf[sizeof(ack_ok)];
444 	u8 retry;
445 	int error;
446 
447 	for (retry = 0; retry < RM_MAX_FW_RETRIES; retry++) {
448 		switch (state) {
449 		case RAYDIUM_ACK_NULL:
450 			return 0;
451 
452 		case RAYDIUM_WAIT_READY:
453 			error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
454 						 &rbuf[0], 1);
455 			if (!error && rbuf[0] == RM_BOOT_RDY)
456 				return 0;
457 
458 			break;
459 
460 		case RAYDIUM_PATH_READY:
461 			error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
462 						 rbuf, sizeof(rbuf));
463 			if (!error && !memcmp(rbuf, ack_ok, sizeof(ack_ok)))
464 				return 0;
465 
466 			break;
467 
468 		default:
469 			dev_err(&client->dev, "%s: invalid target state %d\n",
470 				__func__, state);
471 			return -EINVAL;
472 		}
473 
474 		msleep(20);
475 	}
476 
477 	return -ETIMEDOUT;
478 }
479 
480 static int raydium_i2c_write_object(struct i2c_client *client,
481 				    const void *data, size_t len,
482 				    enum raydium_bl_ack state)
483 {
484 	int error;
485 	static const u8 cmd[] = { 0xFF, 0x39 };
486 
487 	error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
488 	if (error) {
489 		dev_err(&client->dev, "WRT obj command failed: %d\n",
490 			error);
491 		return error;
492 	}
493 
494 	error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, cmd, sizeof(cmd));
495 	if (error) {
496 		dev_err(&client->dev, "Ack obj command failed: %d\n", error);
497 		return error;
498 	}
499 
500 	error = raydium_i2c_bl_chk_state(client, state);
501 	if (error) {
502 		dev_err(&client->dev, "BL check state failed: %d\n", error);
503 		return error;
504 	}
505 	return 0;
506 }
507 
508 static int raydium_i2c_boot_trigger(struct i2c_client *client)
509 {
510 	static const u8 cmd[7][6] = {
511 		{ 0x08, 0x0C, 0x09, 0x00, 0x50, 0xD7 },
512 		{ 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
513 		{ 0x08, 0x04, 0x09, 0x00, 0x50, 0x00 },
514 		{ 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
515 		{ 0x08, 0x0C, 0x09, 0x00, 0x50, 0x00 },
516 		{ 0x06, 0x01, 0x00, 0x00, 0x00, 0x00 },
517 		{ 0x02, 0xA2, 0x00, 0x00, 0x00, 0x00 },
518 	};
519 	int i;
520 	int error;
521 
522 	for (i = 0; i < 7; i++) {
523 		error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
524 						 RAYDIUM_WAIT_READY);
525 		if (error) {
526 			dev_err(&client->dev,
527 				"boot trigger failed at step %d: %d\n",
528 				i, error);
529 			return error;
530 		}
531 	}
532 
533 	return 0;
534 }
535 
536 static int raydium_i2c_fw_trigger(struct i2c_client *client)
537 {
538 	static const u8 cmd[5][11] = {
539 		{ 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0xD7, 0, 0, 0 },
540 		{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
541 		{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
542 		{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
543 		{ 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
544 	};
545 	int i;
546 	int error;
547 
548 	for (i = 0; i < 5; i++) {
549 		error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
550 						 RAYDIUM_ACK_NULL);
551 		if (error) {
552 			dev_err(&client->dev,
553 				"fw trigger failed at step %d: %d\n",
554 				i, error);
555 			return error;
556 		}
557 	}
558 
559 	return 0;
560 }
561 
562 static int raydium_i2c_check_path(struct i2c_client *client)
563 {
564 	static const u8 cmd[] = { 0x09, 0x00, 0x09, 0x00, 0x50, 0x10, 0x00 };
565 	int error;
566 
567 	error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
568 					 RAYDIUM_PATH_READY);
569 	if (error) {
570 		dev_err(&client->dev, "check path command failed: %d\n", error);
571 		return error;
572 	}
573 
574 	return 0;
575 }
576 
577 static int raydium_i2c_enter_bl(struct i2c_client *client)
578 {
579 	static const u8 cal_cmd[] = { 0x00, 0x01, 0x52 };
580 	int error;
581 
582 	error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
583 					 RAYDIUM_ACK_NULL);
584 	if (error) {
585 		dev_err(&client->dev, "enter bl command failed: %d\n", error);
586 		return error;
587 	}
588 
589 	msleep(RM_BOOT_DELAY_MS);
590 	return 0;
591 }
592 
593 static int raydium_i2c_leave_bl(struct i2c_client *client)
594 {
595 	static const u8 leave_cmd[] = { 0x05, 0x00 };
596 	int error;
597 
598 	error = raydium_i2c_write_object(client, leave_cmd, sizeof(leave_cmd),
599 					 RAYDIUM_ACK_NULL);
600 	if (error) {
601 		dev_err(&client->dev, "leave bl command failed: %d\n", error);
602 		return error;
603 	}
604 
605 	msleep(RM_BOOT_DELAY_MS);
606 	return 0;
607 }
608 
609 static int raydium_i2c_write_checksum(struct i2c_client *client,
610 				      size_t length, u16 checksum)
611 {
612 	u8 checksum_cmd[] = { 0x00, 0x05, 0x6D, 0x00, 0x00, 0x00, 0x00 };
613 	int error;
614 
615 	put_unaligned_le16(length, &checksum_cmd[3]);
616 	put_unaligned_le16(checksum, &checksum_cmd[5]);
617 
618 	error = raydium_i2c_write_object(client,
619 					 checksum_cmd, sizeof(checksum_cmd),
620 					 RAYDIUM_ACK_NULL);
621 	if (error) {
622 		dev_err(&client->dev, "failed to write checksum: %d\n",
623 			error);
624 		return error;
625 	}
626 
627 	return 0;
628 }
629 
630 static int raydium_i2c_disable_watch_dog(struct i2c_client *client)
631 {
632 	static const u8 cmd[] = { 0x0A, 0xAA };
633 	int error;
634 
635 	error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
636 					 RAYDIUM_WAIT_READY);
637 	if (error) {
638 		dev_err(&client->dev, "disable watchdog command failed: %d\n",
639 			error);
640 		return error;
641 	}
642 
643 	return 0;
644 }
645 
646 static int raydium_i2c_fw_write_page(struct i2c_client *client,
647 				     u16 page_idx, const void *data, size_t len)
648 {
649 	u8 buf[RM_BL_WRT_LEN];
650 	size_t xfer_len;
651 	int error;
652 	int i;
653 
654 	BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
655 
656 	for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
657 		buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
658 		buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
659 		buf[BL_PKG_IDX] = i + 1;
660 
661 		xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
662 		memcpy(&buf[BL_DATA_STR], data, xfer_len);
663 		if (len < RM_BL_WRT_PKG_SIZE)
664 			memset(&buf[BL_DATA_STR + xfer_len], 0xff,
665 				RM_BL_WRT_PKG_SIZE - xfer_len);
666 
667 		error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
668 						 RAYDIUM_WAIT_READY);
669 		if (error) {
670 			dev_err(&client->dev,
671 				"page write command failed for page %d, chunk %d: %d\n",
672 				page_idx, i, error);
673 			return error;
674 		}
675 
676 		data += xfer_len;
677 		len -= xfer_len;
678 	}
679 
680 	return error;
681 }
682 
683 static u16 raydium_calc_chksum(const u8 *buf, u16 len)
684 {
685 	u16 checksum = 0;
686 	u16 i;
687 
688 	for (i = 0; i < len; i++)
689 		checksum += buf[i];
690 
691 	return checksum;
692 }
693 
694 static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
695 					 const struct firmware *fw)
696 {
697 	struct i2c_client *client = ts->client;
698 	const void *data;
699 	size_t data_len;
700 	size_t len;
701 	int page_nr;
702 	int i;
703 	int error;
704 	u16 fw_checksum;
705 
706 	if (fw->size == 0 || fw->size > RM_MAX_FW_SIZE) {
707 		dev_err(&client->dev, "Invalid firmware length\n");
708 		return -EINVAL;
709 	}
710 
711 	error = raydium_i2c_check_fw_status(ts);
712 	if (error) {
713 		dev_err(&client->dev, "Unable to access IC %d\n", error);
714 		return error;
715 	}
716 
717 	if (ts->boot_mode == RAYDIUM_TS_MAIN) {
718 		for (i = 0; i < RM_MAX_RETRIES; i++) {
719 			error = raydium_i2c_enter_bl(client);
720 			if (!error) {
721 				error = raydium_i2c_check_fw_status(ts);
722 				if (error) {
723 					dev_err(&client->dev,
724 						"unable to access IC: %d\n",
725 						error);
726 					return error;
727 				}
728 
729 				if (ts->boot_mode == RAYDIUM_TS_BLDR)
730 					break;
731 			}
732 		}
733 
734 		if (ts->boot_mode == RAYDIUM_TS_MAIN) {
735 			dev_err(&client->dev,
736 				"failed to jump to boot loader: %d\n",
737 				error);
738 			return -EIO;
739 		}
740 	}
741 
742 	error = raydium_i2c_disable_watch_dog(client);
743 	if (error)
744 		return error;
745 
746 	error = raydium_i2c_check_path(client);
747 	if (error)
748 		return error;
749 
750 	error = raydium_i2c_boot_trigger(client);
751 	if (error) {
752 		dev_err(&client->dev, "send boot trigger fail: %d\n", error);
753 		return error;
754 	}
755 
756 	msleep(RM_BOOT_DELAY_MS);
757 
758 	data = fw->data;
759 	data_len = fw->size;
760 	page_nr = 0;
761 
762 	while (data_len) {
763 		len = min_t(size_t, data_len, RM_FW_PAGE_SIZE);
764 
765 		error = raydium_i2c_fw_write_page(client, page_nr++, data, len);
766 		if (error)
767 			return error;
768 
769 		msleep(20);
770 
771 		data += len;
772 		data_len -= len;
773 	}
774 
775 	error = raydium_i2c_leave_bl(client);
776 	if (error) {
777 		dev_err(&client->dev,
778 			"failed to leave boot loader: %d\n", error);
779 		return error;
780 	}
781 
782 	dev_dbg(&client->dev, "left boot loader mode\n");
783 	msleep(RM_BOOT_DELAY_MS);
784 
785 	error = raydium_i2c_check_fw_status(ts);
786 	if (error) {
787 		dev_err(&client->dev,
788 			"failed to check fw status after write: %d\n",
789 			error);
790 		return error;
791 	}
792 
793 	if (ts->boot_mode != RAYDIUM_TS_MAIN) {
794 		dev_err(&client->dev,
795 			"failed to switch to main fw after writing firmware: %d\n",
796 			error);
797 		return -EINVAL;
798 	}
799 
800 	error = raydium_i2c_fw_trigger(client);
801 	if (error) {
802 		dev_err(&client->dev, "failed to trigger fw: %d\n", error);
803 		return error;
804 	}
805 
806 	fw_checksum = raydium_calc_chksum(fw->data, fw->size);
807 
808 	error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
809 	if (error)
810 		return error;
811 
812 	return 0;
813 }
814 
815 static int raydium_i2c_fw_update(struct raydium_data *ts)
816 {
817 	struct i2c_client *client = ts->client;
818 	const struct firmware *fw = NULL;
819 	char *fw_file;
820 	int error;
821 
822 	fw_file = kasprintf(GFP_KERNEL, "raydium_%#04x.fw",
823 			    le32_to_cpu(ts->info.hw_ver));
824 	if (!fw_file)
825 		return -ENOMEM;
826 
827 	dev_dbg(&client->dev, "firmware name: %s\n", fw_file);
828 
829 	error = request_firmware(&fw, fw_file, &client->dev);
830 	if (error) {
831 		dev_err(&client->dev, "Unable to open firmware %s\n", fw_file);
832 		goto out_free_fw_file;
833 	}
834 
835 	disable_irq(client->irq);
836 
837 	error = raydium_i2c_do_update_firmware(ts, fw);
838 	if (error) {
839 		dev_err(&client->dev, "firmware update failed: %d\n", error);
840 		ts->boot_mode = RAYDIUM_TS_BLDR;
841 		goto out_enable_irq;
842 	}
843 
844 	error = raydium_i2c_initialize(ts);
845 	if (error) {
846 		dev_err(&client->dev,
847 			"failed to initialize device after firmware update: %d\n",
848 			error);
849 		ts->boot_mode = RAYDIUM_TS_BLDR;
850 		goto out_enable_irq;
851 	}
852 
853 	ts->boot_mode = RAYDIUM_TS_MAIN;
854 
855 out_enable_irq:
856 	enable_irq(client->irq);
857 	msleep(100);
858 
859 	release_firmware(fw);
860 
861 out_free_fw_file:
862 	kfree(fw_file);
863 
864 	return error;
865 }
866 
867 static void raydium_mt_event(struct raydium_data *ts)
868 {
869 	int i;
870 
871 	for (i = 0; i < ts->report_size / ts->contact_size; i++) {
872 		u8 *contact = &ts->report_data[ts->contact_size * i];
873 		bool state = contact[RM_CONTACT_STATE_POS];
874 		u8 wx, wy;
875 
876 		input_mt_slot(ts->input, i);
877 		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);
878 
879 		if (!state)
880 			continue;
881 
882 		input_report_abs(ts->input, ABS_MT_POSITION_X,
883 				get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
884 		input_report_abs(ts->input, ABS_MT_POSITION_Y,
885 				get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
886 		input_report_abs(ts->input, ABS_MT_PRESSURE,
887 				contact[RM_CONTACT_PRESSURE_POS]);
888 
889 		wx = contact[RM_CONTACT_WIDTH_X_POS];
890 		wy = contact[RM_CONTACT_WIDTH_Y_POS];
891 
892 		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
893 		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
894 	}
895 
896 	input_mt_sync_frame(ts->input);
897 	input_sync(ts->input);
898 }
899 
900 static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
901 {
902 	struct raydium_data *ts = _dev;
903 	int error;
904 	u16 fw_crc;
905 	u16 calc_crc;
906 
907 	if (ts->boot_mode != RAYDIUM_TS_MAIN)
908 		goto out;
909 
910 	error = raydium_i2c_read(ts->client, ts->data_bank_addr,
911 				 ts->report_data, ts->pkg_size);
912 	if (error)
913 		goto out;
914 
915 	fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
916 	calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
917 	if (unlikely(fw_crc != calc_crc)) {
918 		dev_warn(&ts->client->dev,
919 			 "%s: invalid packet crc %#04x vs %#04x\n",
920 			 __func__, calc_crc, fw_crc);
921 		goto out;
922 	}
923 
924 	raydium_mt_event(ts);
925 
926 out:
927 	return IRQ_HANDLED;
928 }
929 
930 static ssize_t raydium_i2c_fw_ver_show(struct device *dev,
931 				       struct device_attribute *attr, char *buf)
932 {
933 	struct i2c_client *client = to_i2c_client(dev);
934 	struct raydium_data *ts = i2c_get_clientdata(client);
935 
936 	return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
937 }
938 
939 static ssize_t raydium_i2c_hw_ver_show(struct device *dev,
940 				       struct device_attribute *attr, char *buf)
941 {
942 	struct i2c_client *client = to_i2c_client(dev);
943 	struct raydium_data *ts = i2c_get_clientdata(client);
944 
945 	return sprintf(buf, "%#04x\n", le32_to_cpu(ts->info.hw_ver));
946 }
947 
948 static ssize_t raydium_i2c_boot_mode_show(struct device *dev,
949 					  struct device_attribute *attr,
950 					  char *buf)
951 {
952 	struct i2c_client *client = to_i2c_client(dev);
953 	struct raydium_data *ts = i2c_get_clientdata(client);
954 
955 	return sprintf(buf, "%s\n",
956 		       ts->boot_mode == RAYDIUM_TS_MAIN ?
957 				"Normal" : "Recovery");
958 }
959 
960 static ssize_t raydium_i2c_update_fw_store(struct device *dev,
961 					   struct device_attribute *attr,
962 					   const char *buf, size_t count)
963 {
964 	struct i2c_client *client = to_i2c_client(dev);
965 	struct raydium_data *ts = i2c_get_clientdata(client);
966 	int error;
967 
968 	error = mutex_lock_interruptible(&ts->sysfs_mutex);
969 	if (error)
970 		return error;
971 
972 	error = raydium_i2c_fw_update(ts);
973 
974 	mutex_unlock(&ts->sysfs_mutex);
975 
976 	return error ?: count;
977 }
978 
979 static ssize_t raydium_i2c_calibrate_store(struct device *dev,
980 					   struct device_attribute *attr,
981 					   const char *buf, size_t count)
982 {
983 	struct i2c_client *client = to_i2c_client(dev);
984 	struct raydium_data *ts = i2c_get_clientdata(client);
985 	static const u8 cal_cmd[] = { 0x00, 0x01, 0x9E };
986 	int error;
987 
988 	error = mutex_lock_interruptible(&ts->sysfs_mutex);
989 	if (error)
990 		return error;
991 
992 	error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
993 					 RAYDIUM_WAIT_READY);
994 	if (error)
995 		dev_err(&client->dev, "calibrate command failed: %d\n", error);
996 
997 	mutex_unlock(&ts->sysfs_mutex);
998 	return error ?: count;
999 }
1000 
1001 static DEVICE_ATTR(fw_version, S_IRUGO, raydium_i2c_fw_ver_show, NULL);
1002 static DEVICE_ATTR(hw_version, S_IRUGO, raydium_i2c_hw_ver_show, NULL);
1003 static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_i2c_boot_mode_show, NULL);
1004 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, raydium_i2c_update_fw_store);
1005 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, raydium_i2c_calibrate_store);
1006 
1007 static struct attribute *raydium_i2c_attributes[] = {
1008 	&dev_attr_update_fw.attr,
1009 	&dev_attr_boot_mode.attr,
1010 	&dev_attr_fw_version.attr,
1011 	&dev_attr_hw_version.attr,
1012 	&dev_attr_calibrate.attr,
1013 	NULL
1014 };
1015 
1016 static const struct attribute_group raydium_i2c_attribute_group = {
1017 	.attrs = raydium_i2c_attributes,
1018 };
1019 
1020 static int raydium_i2c_power_on(struct raydium_data *ts)
1021 {
1022 	int error;
1023 
1024 	if (!ts->reset_gpio)
1025 		return 0;
1026 
1027 	gpiod_set_value_cansleep(ts->reset_gpio, 1);
1028 
1029 	error = regulator_enable(ts->avdd);
1030 	if (error) {
1031 		dev_err(&ts->client->dev,
1032 			"failed to enable avdd regulator: %d\n", error);
1033 		goto release_reset_gpio;
1034 	}
1035 
1036 	error = regulator_enable(ts->vccio);
1037 	if (error) {
1038 		regulator_disable(ts->avdd);
1039 		dev_err(&ts->client->dev,
1040 			"failed to enable vccio regulator: %d\n", error);
1041 		goto release_reset_gpio;
1042 	}
1043 
1044 	udelay(RM_POWERON_DELAY_USEC);
1045 
1046 release_reset_gpio:
1047 	gpiod_set_value_cansleep(ts->reset_gpio, 0);
1048 
1049 	if (error)
1050 		return error;
1051 
1052 	msleep(RM_RESET_DELAY_MSEC);
1053 
1054 	return 0;
1055 }
1056 
1057 static void raydium_i2c_power_off(void *_data)
1058 {
1059 	struct raydium_data *ts = _data;
1060 
1061 	if (ts->reset_gpio) {
1062 		gpiod_set_value_cansleep(ts->reset_gpio, 1);
1063 		regulator_disable(ts->vccio);
1064 		regulator_disable(ts->avdd);
1065 	}
1066 }
1067 
1068 static int raydium_i2c_probe(struct i2c_client *client)
1069 {
1070 	union i2c_smbus_data dummy;
1071 	struct raydium_data *ts;
1072 	int error;
1073 
1074 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1075 		dev_err(&client->dev,
1076 			"i2c check functionality error (need I2C_FUNC_I2C)\n");
1077 		return -ENXIO;
1078 	}
1079 
1080 	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
1081 	if (!ts)
1082 		return -ENOMEM;
1083 
1084 	mutex_init(&ts->sysfs_mutex);
1085 
1086 	ts->client = client;
1087 	i2c_set_clientdata(client, ts);
1088 
1089 	ts->avdd = devm_regulator_get(&client->dev, "avdd");
1090 	if (IS_ERR(ts->avdd))
1091 		return dev_err_probe(&client->dev, PTR_ERR(ts->avdd),
1092 				     "Failed to get 'avdd' regulator\n");
1093 
1094 	ts->vccio = devm_regulator_get(&client->dev, "vccio");
1095 	if (IS_ERR(ts->vccio))
1096 		return dev_err_probe(&client->dev, PTR_ERR(ts->vccio),
1097 				     "Failed to get 'vccio' regulator\n");
1098 
1099 	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1100 						 GPIOD_OUT_LOW);
1101 	if (IS_ERR(ts->reset_gpio))
1102 		return dev_err_probe(&client->dev, PTR_ERR(ts->reset_gpio),
1103 				     "Failed to get reset gpio\n");
1104 
1105 	error = raydium_i2c_power_on(ts);
1106 	if (error)
1107 		return error;
1108 
1109 	error = devm_add_action_or_reset(&client->dev,
1110 					 raydium_i2c_power_off, ts);
1111 	if (error) {
1112 		dev_err(&client->dev,
1113 			"failed to install power off action: %d\n", error);
1114 		return error;
1115 	}
1116 
1117 	/* Make sure there is something at this address */
1118 	if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1119 			   I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
1120 		dev_err(&client->dev, "nothing at this address\n");
1121 		return -ENXIO;
1122 	}
1123 
1124 	error = raydium_i2c_initialize(ts);
1125 	if (error) {
1126 		dev_err(&client->dev, "failed to initialize: %d\n", error);
1127 		return error;
1128 	}
1129 
1130 	ts->report_data = devm_kmalloc(&client->dev,
1131 				       ts->pkg_size, GFP_KERNEL);
1132 	if (!ts->report_data)
1133 		return -ENOMEM;
1134 
1135 	ts->input = devm_input_allocate_device(&client->dev);
1136 	if (!ts->input) {
1137 		dev_err(&client->dev, "Failed to allocate input device\n");
1138 		return -ENOMEM;
1139 	}
1140 
1141 	ts->input->name = "Raydium Touchscreen";
1142 	ts->input->id.bustype = BUS_I2C;
1143 
1144 	input_set_abs_params(ts->input, ABS_MT_POSITION_X,
1145 			     0, le16_to_cpu(ts->info.x_max), 0, 0);
1146 	input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
1147 			     0, le16_to_cpu(ts->info.y_max), 0, 0);
1148 	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
1149 	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
1150 
1151 	input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
1152 	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
1153 
1154 	error = input_mt_init_slots(ts->input, RM_MAX_TOUCH_NUM,
1155 				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
1156 	if (error) {
1157 		dev_err(&client->dev,
1158 			"failed to initialize MT slots: %d\n", error);
1159 		return error;
1160 	}
1161 
1162 	error = input_register_device(ts->input);
1163 	if (error) {
1164 		dev_err(&client->dev,
1165 			"unable to register input device: %d\n", error);
1166 		return error;
1167 	}
1168 
1169 	error = devm_request_threaded_irq(&client->dev, client->irq,
1170 					  NULL, raydium_i2c_irq,
1171 					  IRQF_ONESHOT, client->name, ts);
1172 	if (error) {
1173 		dev_err(&client->dev, "Failed to register interrupt\n");
1174 		return error;
1175 	}
1176 
1177 	error = devm_device_add_group(&client->dev,
1178 				   &raydium_i2c_attribute_group);
1179 	if (error) {
1180 		dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1181 			error);
1182 		return error;
1183 	}
1184 
1185 	return 0;
1186 }
1187 
1188 static void raydium_enter_sleep(struct i2c_client *client)
1189 {
1190 	static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
1191 	int error;
1192 
1193 	error = raydium_i2c_send(client, RM_CMD_ENTER_SLEEP,
1194 				 sleep_cmd, sizeof(sleep_cmd));
1195 	if (error)
1196 		dev_err(&client->dev,
1197 			"sleep command failed: %d\n", error);
1198 }
1199 
1200 static int raydium_i2c_suspend(struct device *dev)
1201 {
1202 	struct i2c_client *client = to_i2c_client(dev);
1203 	struct raydium_data *ts = i2c_get_clientdata(client);
1204 
1205 	/* Sleep is not available in BLDR recovery mode */
1206 	if (ts->boot_mode != RAYDIUM_TS_MAIN)
1207 		return -EBUSY;
1208 
1209 	disable_irq(client->irq);
1210 
1211 	if (device_may_wakeup(dev)) {
1212 		raydium_enter_sleep(client);
1213 	} else {
1214 		raydium_i2c_power_off(ts);
1215 	}
1216 
1217 	return 0;
1218 }
1219 
1220 static int raydium_i2c_resume(struct device *dev)
1221 {
1222 	struct i2c_client *client = to_i2c_client(dev);
1223 	struct raydium_data *ts = i2c_get_clientdata(client);
1224 
1225 	if (device_may_wakeup(dev)) {
1226 		raydium_i2c_sw_reset(client);
1227 	} else {
1228 		raydium_i2c_power_on(ts);
1229 		raydium_i2c_initialize(ts);
1230 	}
1231 
1232 	enable_irq(client->irq);
1233 
1234 	return 0;
1235 }
1236 
1237 static DEFINE_SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
1238 				raydium_i2c_suspend, raydium_i2c_resume);
1239 
1240 static const struct i2c_device_id raydium_i2c_id[] = {
1241 	{ "raydium_i2c", 0 },
1242 	{ "rm32380", 0 },
1243 	{ /* sentinel */ }
1244 };
1245 MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
1246 
1247 #ifdef CONFIG_ACPI
1248 static const struct acpi_device_id raydium_acpi_id[] = {
1249 	{ "RAYD0001", 0 },
1250 	{ /* sentinel */ }
1251 };
1252 MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
1253 #endif
1254 
1255 #ifdef CONFIG_OF
1256 static const struct of_device_id raydium_of_match[] = {
1257 	{ .compatible = "raydium,rm32380", },
1258 	{ /* sentinel */ }
1259 };
1260 MODULE_DEVICE_TABLE(of, raydium_of_match);
1261 #endif
1262 
1263 static struct i2c_driver raydium_i2c_driver = {
1264 	.probe = raydium_i2c_probe,
1265 	.id_table = raydium_i2c_id,
1266 	.driver = {
1267 		.name = "raydium_ts",
1268 		.pm = pm_sleep_ptr(&raydium_i2c_pm_ops),
1269 		.acpi_match_table = ACPI_PTR(raydium_acpi_id),
1270 		.of_match_table = of_match_ptr(raydium_of_match),
1271 	},
1272 };
1273 module_i2c_driver(raydium_i2c_driver);
1274 
1275 MODULE_AUTHOR("Raydium");
1276 MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
1277 MODULE_LICENSE("GPL v2");
1278