1 /*
2 * Cypress APA trackpad with I2C interface
3 *
4 * Author: Dudley Du <dudl@cypress.com>
5 * Further cleanup and restructuring by:
6 * Daniel Kurtz <djkurtz@chromium.org>
7 * Benson Leung <bleung@chromium.org>
8 *
9 * Copyright (C) 2011-2015 Cypress Semiconductor, Inc.
10 * Copyright (C) 2011-2012 Google, Inc.
11 *
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License. See the file COPYING in the main directory of this archive for
14 * more details.
15 */
16
17 #include <linux/delay.h>
18 #include <linux/i2c.h>
19 #include <linux/input.h>
20 #include <linux/input/mt.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <asm/unaligned.h>
24 #include "cyapa.h"
25
26
27 #define GEN3_MAX_FINGERS 5
28 #define GEN3_FINGER_NUM(x) (((x) >> 4) & 0x07)
29
30 #define BLK_HEAD_BYTES 32
31
32 /* Macro for register map group offset. */
33 #define PRODUCT_ID_SIZE 16
34 #define QUERY_DATA_SIZE 27
35 #define REG_PROTOCOL_GEN_QUERY_OFFSET 20
36
37 #define REG_OFFSET_DATA_BASE 0x0000
38 #define REG_OFFSET_COMMAND_BASE 0x0028
39 #define REG_OFFSET_QUERY_BASE 0x002a
40
41 #define CYAPA_OFFSET_SOFT_RESET REG_OFFSET_COMMAND_BASE
42 #define OP_RECALIBRATION_MASK 0x80
43 #define OP_REPORT_BASELINE_MASK 0x40
44 #define REG_OFFSET_MAX_BASELINE 0x0026
45 #define REG_OFFSET_MIN_BASELINE 0x0027
46
47 #define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
48 #define SET_POWER_MODE_DELAY 10000 /* Unit: us */
49 #define SET_POWER_MODE_TRIES 5
50
51 #define GEN3_BL_CMD_CHECKSUM_SEED 0xff
52 #define GEN3_BL_CMD_INITIATE_BL 0x38
53 #define GEN3_BL_CMD_WRITE_BLOCK 0x39
54 #define GEN3_BL_CMD_VERIFY_BLOCK 0x3a
55 #define GEN3_BL_CMD_TERMINATE_BL 0x3b
56 #define GEN3_BL_CMD_LAUNCH_APP 0xa5
57
58 /*
59 * CYAPA trackpad device states.
60 * Used in register 0x00, bit1-0, DeviceStatus field.
61 * Other values indicate device is in an abnormal state and must be reset.
62 */
63 #define CYAPA_DEV_NORMAL 0x03
64 #define CYAPA_DEV_BUSY 0x01
65
66 #define CYAPA_FW_BLOCK_SIZE 64
67 #define CYAPA_FW_READ_SIZE 16
68 #define CYAPA_FW_HDR_START 0x0780
69 #define CYAPA_FW_HDR_BLOCK_COUNT 2
70 #define CYAPA_FW_HDR_BLOCK_START (CYAPA_FW_HDR_START / CYAPA_FW_BLOCK_SIZE)
71 #define CYAPA_FW_HDR_SIZE (CYAPA_FW_HDR_BLOCK_COUNT * \
72 CYAPA_FW_BLOCK_SIZE)
73 #define CYAPA_FW_DATA_START 0x0800
74 #define CYAPA_FW_DATA_BLOCK_COUNT 480
75 #define CYAPA_FW_DATA_BLOCK_START (CYAPA_FW_DATA_START / CYAPA_FW_BLOCK_SIZE)
76 #define CYAPA_FW_DATA_SIZE (CYAPA_FW_DATA_BLOCK_COUNT * \
77 CYAPA_FW_BLOCK_SIZE)
78 #define CYAPA_FW_SIZE (CYAPA_FW_HDR_SIZE + CYAPA_FW_DATA_SIZE)
79 #define CYAPA_CMD_LEN 16
80
81 #define GEN3_BL_IDLE_FW_MAJ_VER_OFFSET 0x0b
82 #define GEN3_BL_IDLE_FW_MIN_VER_OFFSET (GEN3_BL_IDLE_FW_MAJ_VER_OFFSET + 1)
83
84
85 struct cyapa_touch {
86 /*
87 * high bits or x/y position value
88 * bit 7 - 4: high 4 bits of x position value
89 * bit 3 - 0: high 4 bits of y position value
90 */
91 u8 xy_hi;
92 u8 x_lo; /* low 8 bits of x position value. */
93 u8 y_lo; /* low 8 bits of y position value. */
94 u8 pressure;
95 /* id range is 1 - 15. It is incremented with every new touch. */
96 u8 id;
97 } __packed;
98
99 struct cyapa_reg_data {
100 /*
101 * bit 0 - 1: device status
102 * bit 3 - 2: power mode
103 * bit 6 - 4: reserved
104 * bit 7: interrupt valid bit
105 */
106 u8 device_status;
107 /*
108 * bit 7 - 4: number of fingers currently touching pad
109 * bit 3: valid data check bit
110 * bit 2: middle mechanism button state if exists
111 * bit 1: right mechanism button state if exists
112 * bit 0: left mechanism button state if exists
113 */
114 u8 finger_btn;
115 /* CYAPA reports up to 5 touches per packet. */
116 struct cyapa_touch touches[5];
117 } __packed;
118
119 struct gen3_write_block_cmd {
120 u8 checksum_seed; /* Always be 0xff */
121 u8 cmd_code; /* command code: 0x39 */
122 u8 key[8]; /* 8-byte security key */
123 __be16 block_num;
124 u8 block_data[CYAPA_FW_BLOCK_SIZE];
125 u8 block_checksum; /* Calculated using bytes 12 - 75 */
126 u8 cmd_checksum; /* Calculated using bytes 0-76 */
127 } __packed;
128
129 static const u8 security_key[] = {
130 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
131 static const u8 bl_activate[] = { 0x00, 0xff, 0x38, 0x00, 0x01, 0x02, 0x03,
132 0x04, 0x05, 0x06, 0x07 };
133 static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02, 0x03,
134 0x04, 0x05, 0x06, 0x07 };
135 static const u8 bl_exit[] = { 0x00, 0xff, 0xa5, 0x00, 0x01, 0x02, 0x03, 0x04,
136 0x05, 0x06, 0x07 };
137
138
139 /* for byte read/write command */
140 #define CMD_RESET 0
141 #define CMD_POWER_MODE 1
142 #define CMD_DEV_STATUS 2
143 #define CMD_REPORT_MAX_BASELINE 3
144 #define CMD_REPORT_MIN_BASELINE 4
145 #define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
146 #define CYAPA_SMBUS_RESET SMBUS_BYTE_CMD(CMD_RESET)
147 #define CYAPA_SMBUS_POWER_MODE SMBUS_BYTE_CMD(CMD_POWER_MODE)
148 #define CYAPA_SMBUS_DEV_STATUS SMBUS_BYTE_CMD(CMD_DEV_STATUS)
149 #define CYAPA_SMBUS_MAX_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE)
150 #define CYAPA_SMBUS_MIN_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE)
151
152 /* for group registers read/write command */
153 #define REG_GROUP_DATA 0
154 #define REG_GROUP_CMD 2
155 #define REG_GROUP_QUERY 3
156 #define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
157 #define CYAPA_SMBUS_GROUP_DATA SMBUS_GROUP_CMD(REG_GROUP_DATA)
158 #define CYAPA_SMBUS_GROUP_CMD SMBUS_GROUP_CMD(REG_GROUP_CMD)
159 #define CYAPA_SMBUS_GROUP_QUERY SMBUS_GROUP_CMD(REG_GROUP_QUERY)
160
161 /* for register block read/write command */
162 #define CMD_BL_STATUS 0
163 #define CMD_BL_HEAD 1
164 #define CMD_BL_CMD 2
165 #define CMD_BL_DATA 3
166 #define CMD_BL_ALL 4
167 #define CMD_BLK_PRODUCT_ID 5
168 #define CMD_BLK_HEAD 6
169 #define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
170
171 /* register block read/write command in bootloader mode */
172 #define CYAPA_SMBUS_BL_STATUS SMBUS_BLOCK_CMD(CMD_BL_STATUS)
173 #define CYAPA_SMBUS_BL_HEAD SMBUS_BLOCK_CMD(CMD_BL_HEAD)
174 #define CYAPA_SMBUS_BL_CMD SMBUS_BLOCK_CMD(CMD_BL_CMD)
175 #define CYAPA_SMBUS_BL_DATA SMBUS_BLOCK_CMD(CMD_BL_DATA)
176 #define CYAPA_SMBUS_BL_ALL SMBUS_BLOCK_CMD(CMD_BL_ALL)
177
178 /* register block read/write command in operational mode */
179 #define CYAPA_SMBUS_BLK_PRODUCT_ID SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
180 #define CYAPA_SMBUS_BLK_HEAD SMBUS_BLOCK_CMD(CMD_BLK_HEAD)
181
182 struct cyapa_cmd_len {
183 u8 cmd;
184 u8 len;
185 };
186
187 /* maps generic CYAPA_CMD_* code to the I2C equivalent */
188 static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
189 { CYAPA_OFFSET_SOFT_RESET, 1 }, /* CYAPA_CMD_SOFT_RESET */
190 { REG_OFFSET_COMMAND_BASE + 1, 1 }, /* CYAPA_CMD_POWER_MODE */
191 { REG_OFFSET_DATA_BASE, 1 }, /* CYAPA_CMD_DEV_STATUS */
192 { REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
193 /* CYAPA_CMD_GROUP_DATA */
194 { REG_OFFSET_COMMAND_BASE, 0 }, /* CYAPA_CMD_GROUP_CMD */
195 { REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE }, /* CYAPA_CMD_GROUP_QUERY */
196 { BL_HEAD_OFFSET, 3 }, /* CYAPA_CMD_BL_STATUS */
197 { BL_HEAD_OFFSET, 16 }, /* CYAPA_CMD_BL_HEAD */
198 { BL_HEAD_OFFSET, 16 }, /* CYAPA_CMD_BL_CMD */
199 { BL_DATA_OFFSET, 16 }, /* CYAPA_CMD_BL_DATA */
200 { BL_HEAD_OFFSET, 32 }, /* CYAPA_CMD_BL_ALL */
201 { REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
202 /* CYAPA_CMD_BLK_PRODUCT_ID */
203 { REG_OFFSET_DATA_BASE, 32 }, /* CYAPA_CMD_BLK_HEAD */
204 { REG_OFFSET_MAX_BASELINE, 1 }, /* CYAPA_CMD_MAX_BASELINE */
205 { REG_OFFSET_MIN_BASELINE, 1 }, /* CYAPA_CMD_MIN_BASELINE */
206 };
207
208 static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
209 { CYAPA_SMBUS_RESET, 1 }, /* CYAPA_CMD_SOFT_RESET */
210 { CYAPA_SMBUS_POWER_MODE, 1 }, /* CYAPA_CMD_POWER_MODE */
211 { CYAPA_SMBUS_DEV_STATUS, 1 }, /* CYAPA_CMD_DEV_STATUS */
212 { CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
213 /* CYAPA_CMD_GROUP_DATA */
214 { CYAPA_SMBUS_GROUP_CMD, 2 }, /* CYAPA_CMD_GROUP_CMD */
215 { CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
216 /* CYAPA_CMD_GROUP_QUERY */
217 { CYAPA_SMBUS_BL_STATUS, 3 }, /* CYAPA_CMD_BL_STATUS */
218 { CYAPA_SMBUS_BL_HEAD, 16 }, /* CYAPA_CMD_BL_HEAD */
219 { CYAPA_SMBUS_BL_CMD, 16 }, /* CYAPA_CMD_BL_CMD */
220 { CYAPA_SMBUS_BL_DATA, 16 }, /* CYAPA_CMD_BL_DATA */
221 { CYAPA_SMBUS_BL_ALL, 32 }, /* CYAPA_CMD_BL_ALL */
222 { CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
223 /* CYAPA_CMD_BLK_PRODUCT_ID */
224 { CYAPA_SMBUS_BLK_HEAD, 16 }, /* CYAPA_CMD_BLK_HEAD */
225 { CYAPA_SMBUS_MAX_BASELINE, 1 }, /* CYAPA_CMD_MAX_BASELINE */
226 { CYAPA_SMBUS_MIN_BASELINE, 1 }, /* CYAPA_CMD_MIN_BASELINE */
227 };
228
229 static int cyapa_gen3_try_poll_handler(struct cyapa *cyapa);
230
231 /*
232 * cyapa_smbus_read_block - perform smbus block read command
233 * @cyapa - private data structure of the driver
234 * @cmd - the properly encoded smbus command
235 * @len - expected length of smbus command result
236 * @values - buffer to store smbus command result
237 *
238 * Returns negative errno, else the number of bytes written.
239 *
240 * Note:
241 * In trackpad device, the memory block allocated for I2C register map
242 * is 256 bytes, so the max read block for I2C bus is 256 bytes.
243 */
cyapa_smbus_read_block(struct cyapa * cyapa,u8 cmd,size_t len,u8 * values)244 ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
245 u8 *values)
246 {
247 ssize_t ret;
248 u8 index;
249 u8 smbus_cmd;
250 u8 *buf;
251 struct i2c_client *client = cyapa->client;
252
253 if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
254 return -EINVAL;
255
256 if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
257 /* read specific block registers command. */
258 smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
259 ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
260 goto out;
261 }
262
263 ret = 0;
264 for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
265 smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
266 smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
267 buf = values + I2C_SMBUS_BLOCK_MAX * index;
268 ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
269 if (ret < 0)
270 goto out;
271 }
272
273 out:
274 return ret > 0 ? len : ret;
275 }
276
cyapa_read_byte(struct cyapa * cyapa,u8 cmd_idx)277 static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
278 {
279 u8 cmd;
280
281 if (cyapa->smbus) {
282 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
283 cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
284 } else {
285 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
286 }
287 return i2c_smbus_read_byte_data(cyapa->client, cmd);
288 }
289
cyapa_write_byte(struct cyapa * cyapa,u8 cmd_idx,u8 value)290 static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
291 {
292 u8 cmd;
293
294 if (cyapa->smbus) {
295 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
296 cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
297 } else {
298 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
299 }
300 return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
301 }
302
cyapa_i2c_reg_read_block(struct cyapa * cyapa,u8 reg,size_t len,u8 * values)303 ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
304 u8 *values)
305 {
306 return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
307 }
308
cyapa_i2c_reg_write_block(struct cyapa * cyapa,u8 reg,size_t len,const u8 * values)309 static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
310 size_t len, const u8 *values)
311 {
312 return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
313 }
314
cyapa_read_block(struct cyapa * cyapa,u8 cmd_idx,u8 * values)315 ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
316 {
317 u8 cmd;
318 size_t len;
319
320 if (cyapa->smbus) {
321 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
322 len = cyapa_smbus_cmds[cmd_idx].len;
323 return cyapa_smbus_read_block(cyapa, cmd, len, values);
324 }
325 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
326 len = cyapa_i2c_cmds[cmd_idx].len;
327 return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
328 }
329
330 /*
331 * Determine the Gen3 trackpad device's current operating state.
332 *
333 */
cyapa_gen3_state_parse(struct cyapa * cyapa,u8 * reg_data,int len)334 static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
335 {
336 cyapa->state = CYAPA_STATE_NO_DEVICE;
337
338 /* Parse based on Gen3 characteristic registers and bits */
339 if (reg_data[REG_BL_FILE] == BL_FILE &&
340 reg_data[REG_BL_ERROR] == BL_ERROR_NO_ERR_IDLE &&
341 (reg_data[REG_BL_STATUS] ==
342 (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID) ||
343 reg_data[REG_BL_STATUS] == BL_STATUS_RUNNING)) {
344 /*
345 * Normal state after power on or reset,
346 * REG_BL_STATUS == 0x11, firmware image checksum is valid.
347 * REG_BL_STATUS == 0x10, firmware image checksum is invalid.
348 */
349 cyapa->gen = CYAPA_GEN3;
350 cyapa->state = CYAPA_STATE_BL_IDLE;
351 } else if (reg_data[REG_BL_FILE] == BL_FILE &&
352 (reg_data[REG_BL_STATUS] & BL_STATUS_RUNNING) ==
353 BL_STATUS_RUNNING) {
354 cyapa->gen = CYAPA_GEN3;
355 if (reg_data[REG_BL_STATUS] & BL_STATUS_BUSY) {
356 cyapa->state = CYAPA_STATE_BL_BUSY;
357 } else {
358 if ((reg_data[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) ==
359 BL_ERROR_BOOTLOADING)
360 cyapa->state = CYAPA_STATE_BL_ACTIVE;
361 else
362 cyapa->state = CYAPA_STATE_BL_IDLE;
363 }
364 } else if ((reg_data[REG_OP_STATUS] & OP_STATUS_SRC) &&
365 (reg_data[REG_OP_DATA1] & OP_DATA_VALID)) {
366 /*
367 * Normal state when running in operational mode,
368 * may also not in full power state or
369 * busying in command process.
370 */
371 if (GEN3_FINGER_NUM(reg_data[REG_OP_DATA1]) <=
372 GEN3_MAX_FINGERS) {
373 /* Finger number data is valid. */
374 cyapa->gen = CYAPA_GEN3;
375 cyapa->state = CYAPA_STATE_OP;
376 }
377 } else if (reg_data[REG_OP_STATUS] == 0x0C &&
378 reg_data[REG_OP_DATA1] == 0x08) {
379 /* Op state when first two registers overwritten with 0x00 */
380 cyapa->gen = CYAPA_GEN3;
381 cyapa->state = CYAPA_STATE_OP;
382 } else if (reg_data[REG_BL_STATUS] &
383 (BL_STATUS_RUNNING | BL_STATUS_BUSY)) {
384 cyapa->gen = CYAPA_GEN3;
385 cyapa->state = CYAPA_STATE_BL_BUSY;
386 }
387
388 if (cyapa->gen == CYAPA_GEN3 && (cyapa->state == CYAPA_STATE_OP ||
389 cyapa->state == CYAPA_STATE_BL_IDLE ||
390 cyapa->state == CYAPA_STATE_BL_ACTIVE ||
391 cyapa->state == CYAPA_STATE_BL_BUSY))
392 return 0;
393
394 return -EAGAIN;
395 }
396
397 /*
398 * Enter bootloader by soft resetting the device.
399 *
400 * If device is already in the bootloader, the function just returns.
401 * Otherwise, reset the device; after reset, device enters bootloader idle
402 * state immediately.
403 *
404 * Returns:
405 * 0 on success
406 * -EAGAIN device was reset, but is not now in bootloader idle state
407 * < 0 if the device never responds within the timeout
408 */
cyapa_gen3_bl_enter(struct cyapa * cyapa)409 static int cyapa_gen3_bl_enter(struct cyapa *cyapa)
410 {
411 int error;
412 int waiting_time;
413
414 error = cyapa_poll_state(cyapa, 500);
415 if (error)
416 return error;
417 if (cyapa->state == CYAPA_STATE_BL_IDLE) {
418 /* Already in BL_IDLE. Skipping reset. */
419 return 0;
420 }
421
422 if (cyapa->state != CYAPA_STATE_OP)
423 return -EAGAIN;
424
425 cyapa->operational = false;
426 cyapa->state = CYAPA_STATE_NO_DEVICE;
427 error = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, 0x01);
428 if (error)
429 return -EIO;
430
431 usleep_range(25000, 50000);
432 waiting_time = 2000; /* For some shipset, max waiting time is 1~2s. */
433 do {
434 error = cyapa_poll_state(cyapa, 500);
435 if (error) {
436 if (error == -ETIMEDOUT) {
437 waiting_time -= 500;
438 continue;
439 }
440 return error;
441 }
442
443 if ((cyapa->state == CYAPA_STATE_BL_IDLE) &&
444 !(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
445 break;
446
447 msleep(100);
448 waiting_time -= 100;
449 } while (waiting_time > 0);
450
451 if ((cyapa->state != CYAPA_STATE_BL_IDLE) ||
452 (cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
453 return -EAGAIN;
454
455 return 0;
456 }
457
cyapa_gen3_bl_activate(struct cyapa * cyapa)458 static int cyapa_gen3_bl_activate(struct cyapa *cyapa)
459 {
460 int error;
461
462 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_activate),
463 bl_activate);
464 if (error)
465 return error;
466
467 /* Wait for bootloader to activate; takes between 2 and 12 seconds */
468 msleep(2000);
469 error = cyapa_poll_state(cyapa, 11000);
470 if (error)
471 return error;
472 if (cyapa->state != CYAPA_STATE_BL_ACTIVE)
473 return -EAGAIN;
474
475 return 0;
476 }
477
cyapa_gen3_bl_deactivate(struct cyapa * cyapa)478 static int cyapa_gen3_bl_deactivate(struct cyapa *cyapa)
479 {
480 int error;
481
482 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
483 bl_deactivate);
484 if (error)
485 return error;
486
487 /* Wait for bootloader to switch to idle state; should take < 100ms */
488 msleep(100);
489 error = cyapa_poll_state(cyapa, 500);
490 if (error)
491 return error;
492 if (cyapa->state != CYAPA_STATE_BL_IDLE)
493 return -EAGAIN;
494 return 0;
495 }
496
497 /*
498 * Exit bootloader
499 *
500 * Send bl_exit command, then wait 50 - 100 ms to let device transition to
501 * operational mode. If this is the first time the device's firmware is
502 * running, it can take up to 2 seconds to calibrate its sensors. So, poll
503 * the device's new state for up to 2 seconds.
504 *
505 * Returns:
506 * -EIO failure while reading from device
507 * -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
508 * 0 device is supported and in operational mode
509 */
cyapa_gen3_bl_exit(struct cyapa * cyapa)510 static int cyapa_gen3_bl_exit(struct cyapa *cyapa)
511 {
512 int error;
513
514 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
515 if (error)
516 return error;
517
518 /*
519 * Wait for bootloader to exit, and operation mode to start.
520 * Normally, this takes at least 50 ms.
521 */
522 msleep(50);
523 /*
524 * In addition, when a device boots for the first time after being
525 * updated to new firmware, it must first calibrate its sensors, which
526 * can take up to an additional 2 seconds. If the device power is
527 * running low, this may take even longer.
528 */
529 error = cyapa_poll_state(cyapa, 4000);
530 if (error < 0)
531 return error;
532 if (cyapa->state != CYAPA_STATE_OP)
533 return -EAGAIN;
534
535 return 0;
536 }
537
cyapa_gen3_csum(const u8 * buf,size_t count)538 static u16 cyapa_gen3_csum(const u8 *buf, size_t count)
539 {
540 int i;
541 u16 csum = 0;
542
543 for (i = 0; i < count; i++)
544 csum += buf[i];
545
546 return csum;
547 }
548
549 /*
550 * Verify the integrity of a CYAPA firmware image file.
551 *
552 * The firmware image file is 30848 bytes, composed of 482 64-byte blocks.
553 *
554 * The first 2 blocks are the firmware header.
555 * The next 480 blocks are the firmware image.
556 *
557 * The first two bytes of the header hold the header checksum, computed by
558 * summing the other 126 bytes of the header.
559 * The last two bytes of the header hold the firmware image checksum, computed
560 * by summing the 30720 bytes of the image modulo 0xffff.
561 *
562 * Both checksums are stored little-endian.
563 */
cyapa_gen3_check_fw(struct cyapa * cyapa,const struct firmware * fw)564 static int cyapa_gen3_check_fw(struct cyapa *cyapa, const struct firmware *fw)
565 {
566 struct device *dev = &cyapa->client->dev;
567 u16 csum;
568 u16 csum_expected;
569
570 /* Firmware must match exact 30848 bytes = 482 64-byte blocks. */
571 if (fw->size != CYAPA_FW_SIZE) {
572 dev_err(dev, "invalid firmware size = %zu, expected %u.\n",
573 fw->size, CYAPA_FW_SIZE);
574 return -EINVAL;
575 }
576
577 /* Verify header block */
578 csum_expected = (fw->data[0] << 8) | fw->data[1];
579 csum = cyapa_gen3_csum(&fw->data[2], CYAPA_FW_HDR_SIZE - 2);
580 if (csum != csum_expected) {
581 dev_err(dev, "%s %04x, expected: %04x\n",
582 "invalid firmware header checksum = ",
583 csum, csum_expected);
584 return -EINVAL;
585 }
586
587 /* Verify firmware image */
588 csum_expected = (fw->data[CYAPA_FW_HDR_SIZE - 2] << 8) |
589 fw->data[CYAPA_FW_HDR_SIZE - 1];
590 csum = cyapa_gen3_csum(&fw->data[CYAPA_FW_HDR_SIZE],
591 CYAPA_FW_DATA_SIZE);
592 if (csum != csum_expected) {
593 dev_err(dev, "%s %04x, expected: %04x\n",
594 "invalid firmware header checksum = ",
595 csum, csum_expected);
596 return -EINVAL;
597 }
598 return 0;
599 }
600
601 /*
602 * Write a |len| byte long buffer |buf| to the device, by chopping it up into a
603 * sequence of smaller |CYAPA_CMD_LEN|-length write commands.
604 *
605 * The data bytes for a write command are prepended with the 1-byte offset
606 * of the data relative to the start of |buf|.
607 */
cyapa_gen3_write_buffer(struct cyapa * cyapa,const u8 * buf,size_t len)608 static int cyapa_gen3_write_buffer(struct cyapa *cyapa,
609 const u8 *buf, size_t len)
610 {
611 int error;
612 size_t i;
613 unsigned char cmd[CYAPA_CMD_LEN + 1];
614 size_t cmd_len;
615
616 for (i = 0; i < len; i += CYAPA_CMD_LEN) {
617 const u8 *payload = &buf[i];
618
619 cmd_len = (len - i >= CYAPA_CMD_LEN) ? CYAPA_CMD_LEN : len - i;
620 cmd[0] = i;
621 memcpy(&cmd[1], payload, cmd_len);
622
623 error = cyapa_i2c_reg_write_block(cyapa, 0, cmd_len + 1, cmd);
624 if (error)
625 return error;
626 }
627 return 0;
628 }
629
630 /*
631 * A firmware block write command writes 64 bytes of data to a single flash
632 * page in the device. The 78-byte block write command has the format:
633 * <0xff> <CMD> <Key> <Start> <Data> <Data-Checksum> <CMD Checksum>
634 *
635 * <0xff> - every command starts with 0xff
636 * <CMD> - the write command value is 0x39
637 * <Key> - write commands include an 8-byte key: { 00 01 02 03 04 05 06 07 }
638 * <Block> - Memory Block number (address / 64) (16-bit, big-endian)
639 * <Data> - 64 bytes of firmware image data
640 * <Data Checksum> - sum of 64 <Data> bytes, modulo 0xff
641 * <CMD Checksum> - sum of 77 bytes, from 0xff to <Data Checksum>
642 *
643 * Each write command is split into 5 i2c write transactions of up to 16 bytes.
644 * Each transaction starts with an i2c register offset: (00, 10, 20, 30, 40).
645 */
cyapa_gen3_write_fw_block(struct cyapa * cyapa,u16 block,const u8 * data)646 static int cyapa_gen3_write_fw_block(struct cyapa *cyapa,
647 u16 block, const u8 *data)
648 {
649 int ret;
650 struct gen3_write_block_cmd write_block_cmd;
651 u8 status[BL_STATUS_SIZE];
652 int tries;
653 u8 bl_status, bl_error;
654
655 /* Set write command and security key bytes. */
656 write_block_cmd.checksum_seed = GEN3_BL_CMD_CHECKSUM_SEED;
657 write_block_cmd.cmd_code = GEN3_BL_CMD_WRITE_BLOCK;
658 memcpy(write_block_cmd.key, security_key, sizeof(security_key));
659 put_unaligned_be16(block, &write_block_cmd.block_num);
660 memcpy(write_block_cmd.block_data, data, CYAPA_FW_BLOCK_SIZE);
661 write_block_cmd.block_checksum = cyapa_gen3_csum(
662 write_block_cmd.block_data, CYAPA_FW_BLOCK_SIZE);
663 write_block_cmd.cmd_checksum = cyapa_gen3_csum((u8 *)&write_block_cmd,
664 sizeof(write_block_cmd) - 1);
665
666 ret = cyapa_gen3_write_buffer(cyapa, (u8 *)&write_block_cmd,
667 sizeof(write_block_cmd));
668 if (ret)
669 return ret;
670
671 /* Wait for write to finish */
672 tries = 11; /* Programming for one block can take about 100ms. */
673 do {
674 usleep_range(10000, 20000);
675
676 /* Check block write command result status. */
677 ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET,
678 BL_STATUS_SIZE, status);
679 if (ret != BL_STATUS_SIZE)
680 return (ret < 0) ? ret : -EIO;
681 } while ((status[REG_BL_STATUS] & BL_STATUS_BUSY) && --tries);
682
683 /* Ignore WATCHDOG bit and reserved bits. */
684 bl_status = status[REG_BL_STATUS] & ~BL_STATUS_REV_MASK;
685 bl_error = status[REG_BL_ERROR] & ~BL_ERROR_RESERVED;
686
687 if (bl_status & BL_STATUS_BUSY)
688 ret = -ETIMEDOUT;
689 else if (bl_status != BL_STATUS_RUNNING ||
690 bl_error != BL_ERROR_BOOTLOADING)
691 ret = -EIO;
692 else
693 ret = 0;
694
695 return ret;
696 }
697
cyapa_gen3_write_blocks(struct cyapa * cyapa,size_t start_block,size_t block_count,const u8 * image_data)698 static int cyapa_gen3_write_blocks(struct cyapa *cyapa,
699 size_t start_block, size_t block_count,
700 const u8 *image_data)
701 {
702 int error;
703 int i;
704
705 for (i = 0; i < block_count; i++) {
706 size_t block = start_block + i;
707 size_t addr = i * CYAPA_FW_BLOCK_SIZE;
708 const u8 *data = &image_data[addr];
709
710 error = cyapa_gen3_write_fw_block(cyapa, block, data);
711 if (error)
712 return error;
713 }
714 return 0;
715 }
716
cyapa_gen3_do_fw_update(struct cyapa * cyapa,const struct firmware * fw)717 static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
718 const struct firmware *fw)
719 {
720 struct device *dev = &cyapa->client->dev;
721 int error;
722
723 /* First write data, starting at byte 128 of fw->data */
724 error = cyapa_gen3_write_blocks(cyapa,
725 CYAPA_FW_DATA_BLOCK_START, CYAPA_FW_DATA_BLOCK_COUNT,
726 &fw->data[CYAPA_FW_HDR_BLOCK_COUNT * CYAPA_FW_BLOCK_SIZE]);
727 if (error) {
728 dev_err(dev, "FW update aborted, write image: %d\n", error);
729 return error;
730 }
731
732 /* Then write checksum */
733 error = cyapa_gen3_write_blocks(cyapa,
734 CYAPA_FW_HDR_BLOCK_START, CYAPA_FW_HDR_BLOCK_COUNT,
735 &fw->data[0]);
736 if (error) {
737 dev_err(dev, "FW update aborted, write checksum: %d\n", error);
738 return error;
739 }
740
741 return 0;
742 }
743
cyapa_gen3_do_calibrate(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)744 static ssize_t cyapa_gen3_do_calibrate(struct device *dev,
745 struct device_attribute *attr,
746 const char *buf, size_t count)
747 {
748 struct cyapa *cyapa = dev_get_drvdata(dev);
749 unsigned long timeout;
750 int ret;
751
752 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
753 if (ret < 0) {
754 dev_err(dev, "Error reading dev status: %d\n", ret);
755 goto out;
756 }
757 if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
758 dev_warn(dev, "Trackpad device is busy, device state: 0x%02x\n",
759 ret);
760 ret = -EAGAIN;
761 goto out;
762 }
763
764 ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
765 OP_RECALIBRATION_MASK);
766 if (ret < 0) {
767 dev_err(dev, "Failed to send calibrate command: %d\n",
768 ret);
769 goto out;
770 }
771
772 /* max recalibration timeout 2s. */
773 timeout = jiffies + 2 * HZ;
774 do {
775 /*
776 * For this recalibration, the max time will not exceed 2s.
777 * The average time is approximately 500 - 700 ms, and we
778 * will check the status every 100 - 200ms.
779 */
780 msleep(100);
781 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
782 if (ret < 0) {
783 dev_err(dev, "Error reading dev status: %d\n", ret);
784 goto out;
785 }
786 if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL) {
787 dev_dbg(dev, "Calibration successful.\n");
788 goto out;
789 }
790 } while (time_is_after_jiffies(timeout));
791
792 dev_err(dev, "Failed to calibrate. Timeout.\n");
793 ret = -ETIMEDOUT;
794
795 out:
796 return ret < 0 ? ret : count;
797 }
798
cyapa_gen3_show_baseline(struct device * dev,struct device_attribute * attr,char * buf)799 static ssize_t cyapa_gen3_show_baseline(struct device *dev,
800 struct device_attribute *attr, char *buf)
801 {
802 struct cyapa *cyapa = dev_get_drvdata(dev);
803 int max_baseline, min_baseline;
804 int tries;
805 int ret;
806
807 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
808 if (ret < 0) {
809 dev_err(dev, "Error reading dev status. err = %d\n", ret);
810 goto out;
811 }
812 if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
813 dev_warn(dev, "Trackpad device is busy. device state = 0x%x\n",
814 ret);
815 ret = -EAGAIN;
816 goto out;
817 }
818
819 ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
820 OP_REPORT_BASELINE_MASK);
821 if (ret < 0) {
822 dev_err(dev, "Failed to send report baseline command. %d\n",
823 ret);
824 goto out;
825 }
826
827 tries = 3; /* Try for 30 to 60 ms */
828 do {
829 usleep_range(10000, 20000);
830
831 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
832 if (ret < 0) {
833 dev_err(dev, "Error reading dev status. err = %d\n",
834 ret);
835 goto out;
836 }
837 if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
838 break;
839 } while (--tries);
840
841 if (tries == 0) {
842 dev_err(dev, "Device timed out going to Normal state.\n");
843 ret = -ETIMEDOUT;
844 goto out;
845 }
846
847 ret = cyapa_read_byte(cyapa, CYAPA_CMD_MAX_BASELINE);
848 if (ret < 0) {
849 dev_err(dev, "Failed to read max baseline. err = %d\n", ret);
850 goto out;
851 }
852 max_baseline = ret;
853
854 ret = cyapa_read_byte(cyapa, CYAPA_CMD_MIN_BASELINE);
855 if (ret < 0) {
856 dev_err(dev, "Failed to read min baseline. err = %d\n", ret);
857 goto out;
858 }
859 min_baseline = ret;
860
861 dev_dbg(dev, "Baseline report successful. Max: %d Min: %d\n",
862 max_baseline, min_baseline);
863 ret = scnprintf(buf, PAGE_SIZE, "%d %d\n", max_baseline, min_baseline);
864
865 out:
866 return ret;
867 }
868
869 /*
870 * cyapa_get_wait_time_for_pwr_cmd
871 *
872 * Compute the amount of time we need to wait after updating the touchpad
873 * power mode. The touchpad needs to consume the incoming power mode set
874 * command at the current clock rate.
875 */
876
cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode)877 static u16 cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode)
878 {
879 switch (pwr_mode) {
880 case PWR_MODE_FULL_ACTIVE: return 20;
881 case PWR_MODE_BTN_ONLY: return 20;
882 case PWR_MODE_OFF: return 20;
883 default: return cyapa_pwr_cmd_to_sleep_time(pwr_mode) + 50;
884 }
885 }
886
887 /*
888 * Set device power mode
889 *
890 * Write to the field to configure power state. Power states include :
891 * Full : Max scans and report rate.
892 * Idle : Report rate set by user specified time.
893 * ButtonOnly : No scans for fingers. When the button is triggered,
894 * a slave interrupt is asserted to notify host to wake up.
895 * Off : Only awake for i2c commands from host. No function for button
896 * or touch sensors.
897 *
898 * The power_mode command should conform to the following :
899 * Full : 0x3f
900 * Idle : Configurable from 20 to 1000ms. See note below for
901 * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
902 * ButtonOnly : 0x01
903 * Off : 0x00
904 *
905 * Device power mode can only be set when device is in operational mode.
906 */
cyapa_gen3_set_power_mode(struct cyapa * cyapa,u8 power_mode,u16 always_unused,enum cyapa_pm_stage pm_stage)907 static int cyapa_gen3_set_power_mode(struct cyapa *cyapa, u8 power_mode,
908 u16 always_unused, enum cyapa_pm_stage pm_stage)
909 {
910 struct input_dev *input = cyapa->input;
911 u8 power;
912 int tries;
913 int sleep_time;
914 int interval;
915 int ret;
916
917 if (cyapa->state != CYAPA_STATE_OP)
918 return 0;
919
920 tries = SET_POWER_MODE_TRIES;
921 while (tries--) {
922 ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
923 if (ret >= 0)
924 break;
925 usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
926 }
927 if (ret < 0)
928 return ret;
929
930 /*
931 * Return early if the power mode to set is the same as the current
932 * one.
933 */
934 if ((ret & PWR_MODE_MASK) == power_mode)
935 return 0;
936
937 sleep_time = (int)cyapa_get_wait_time_for_pwr_cmd(ret & PWR_MODE_MASK);
938 power = ret;
939 power &= ~PWR_MODE_MASK;
940 power |= power_mode & PWR_MODE_MASK;
941 tries = SET_POWER_MODE_TRIES;
942 while (tries--) {
943 ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
944 if (!ret)
945 break;
946 usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
947 }
948
949 /*
950 * Wait for the newly set power command to go in at the previous
951 * clock speed (scanrate) used by the touchpad firmware. Not
952 * doing so before issuing the next command may result in errors
953 * depending on the command's content.
954 */
955 if (cyapa->operational &&
956 input && input_device_enabled(input) &&
957 (pm_stage == CYAPA_PM_RUNTIME_SUSPEND ||
958 pm_stage == CYAPA_PM_RUNTIME_RESUME)) {
959 /* Try to polling in 120Hz, read may fail, just ignore it. */
960 interval = 1000 / 120;
961 while (sleep_time > 0) {
962 if (sleep_time > interval)
963 msleep(interval);
964 else
965 msleep(sleep_time);
966 sleep_time -= interval;
967 cyapa_gen3_try_poll_handler(cyapa);
968 }
969 } else {
970 msleep(sleep_time);
971 }
972
973 return ret;
974 }
975
cyapa_gen3_set_proximity(struct cyapa * cyapa,bool enable)976 static int cyapa_gen3_set_proximity(struct cyapa *cyapa, bool enable)
977 {
978 return -EOPNOTSUPP;
979 }
980
cyapa_gen3_get_query_data(struct cyapa * cyapa)981 static int cyapa_gen3_get_query_data(struct cyapa *cyapa)
982 {
983 u8 query_data[QUERY_DATA_SIZE];
984 int ret;
985
986 if (cyapa->state != CYAPA_STATE_OP)
987 return -EBUSY;
988
989 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
990 if (ret != QUERY_DATA_SIZE)
991 return (ret < 0) ? ret : -EIO;
992
993 memcpy(&cyapa->product_id[0], &query_data[0], 5);
994 cyapa->product_id[5] = '-';
995 memcpy(&cyapa->product_id[6], &query_data[5], 6);
996 cyapa->product_id[12] = '-';
997 memcpy(&cyapa->product_id[13], &query_data[11], 2);
998 cyapa->product_id[15] = '\0';
999
1000 cyapa->fw_maj_ver = query_data[15];
1001 cyapa->fw_min_ver = query_data[16];
1002
1003 cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
1004
1005 cyapa->gen = query_data[20] & 0x0f;
1006
1007 cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
1008 cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
1009
1010 cyapa->physical_size_x =
1011 ((query_data[24] & 0xf0) << 4) | query_data[25];
1012 cyapa->physical_size_y =
1013 ((query_data[24] & 0x0f) << 8) | query_data[26];
1014
1015 cyapa->max_z = 255;
1016
1017 return 0;
1018 }
1019
cyapa_gen3_bl_query_data(struct cyapa * cyapa)1020 static int cyapa_gen3_bl_query_data(struct cyapa *cyapa)
1021 {
1022 u8 bl_data[CYAPA_CMD_LEN];
1023 int ret;
1024
1025 ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data);
1026 if (ret != CYAPA_CMD_LEN)
1027 return (ret < 0) ? ret : -EIO;
1028
1029 /*
1030 * This value will be updated again when entered application mode.
1031 * If TP failed to enter application mode, this fw version values
1032 * can be used as a reference.
1033 * This firmware version valid when fw image checksum is valid.
1034 */
1035 if (bl_data[REG_BL_STATUS] ==
1036 (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) {
1037 cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET];
1038 cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET];
1039 }
1040
1041 return 0;
1042 }
1043
1044 /*
1045 * Check if device is operational.
1046 *
1047 * An operational device is responding, has exited bootloader, and has
1048 * firmware supported by this driver.
1049 *
1050 * Returns:
1051 * -EBUSY no device or in bootloader
1052 * -EIO failure while reading from device
1053 * -EAGAIN device is still in bootloader
1054 * if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
1055 * -EINVAL device is in operational mode, but not supported by this driver
1056 * 0 device is supported
1057 */
cyapa_gen3_do_operational_check(struct cyapa * cyapa)1058 static int cyapa_gen3_do_operational_check(struct cyapa *cyapa)
1059 {
1060 struct device *dev = &cyapa->client->dev;
1061 int error;
1062
1063 switch (cyapa->state) {
1064 case CYAPA_STATE_BL_ACTIVE:
1065 error = cyapa_gen3_bl_deactivate(cyapa);
1066 if (error) {
1067 dev_err(dev, "failed to bl_deactivate: %d\n", error);
1068 return error;
1069 }
1070
1071 fallthrough;
1072 case CYAPA_STATE_BL_IDLE:
1073 /* Try to get firmware version in bootloader mode. */
1074 cyapa_gen3_bl_query_data(cyapa);
1075
1076 error = cyapa_gen3_bl_exit(cyapa);
1077 if (error) {
1078 dev_err(dev, "failed to bl_exit: %d\n", error);
1079 return error;
1080 }
1081
1082 fallthrough;
1083 case CYAPA_STATE_OP:
1084 /*
1085 * Reading query data before going back to the full mode
1086 * may cause problems, so we set the power mode first here.
1087 */
1088 error = cyapa_gen3_set_power_mode(cyapa,
1089 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE);
1090 if (error)
1091 dev_err(dev, "%s: set full power mode failed: %d\n",
1092 __func__, error);
1093 error = cyapa_gen3_get_query_data(cyapa);
1094 if (error < 0)
1095 return error;
1096
1097 /* Only support firmware protocol gen3 */
1098 if (cyapa->gen != CYAPA_GEN3) {
1099 dev_err(dev, "unsupported protocol version (%d)",
1100 cyapa->gen);
1101 return -EINVAL;
1102 }
1103
1104 /* Only support product ID starting with CYTRA */
1105 if (memcmp(cyapa->product_id, product_id,
1106 strlen(product_id)) != 0) {
1107 dev_err(dev, "unsupported product ID (%s)\n",
1108 cyapa->product_id);
1109 return -EINVAL;
1110 }
1111
1112 return 0;
1113
1114 default:
1115 return -EIO;
1116 }
1117 return 0;
1118 }
1119
1120 /*
1121 * Return false, do not continue process
1122 * Return true, continue process.
1123 */
cyapa_gen3_irq_cmd_handler(struct cyapa * cyapa)1124 static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa)
1125 {
1126 /* Not gen3 irq command response, skip for continue. */
1127 if (cyapa->gen != CYAPA_GEN3)
1128 return true;
1129
1130 if (cyapa->operational)
1131 return true;
1132
1133 /*
1134 * Driver in detecting or other interface function processing,
1135 * so, stop cyapa_gen3_irq_handler to continue process to
1136 * avoid unwanted to error detecting and processing.
1137 *
1138 * And also, avoid the periodically asserted interrupts to be processed
1139 * as touch inputs when gen3 failed to launch into application mode,
1140 * which will cause gen3 stays in bootloader mode.
1141 */
1142 return false;
1143 }
1144
cyapa_gen3_event_process(struct cyapa * cyapa,struct cyapa_reg_data * data)1145 static int cyapa_gen3_event_process(struct cyapa *cyapa,
1146 struct cyapa_reg_data *data)
1147 {
1148 struct input_dev *input = cyapa->input;
1149 int num_fingers;
1150 int i;
1151
1152 num_fingers = (data->finger_btn >> 4) & 0x0f;
1153 for (i = 0; i < num_fingers; i++) {
1154 const struct cyapa_touch *touch = &data->touches[i];
1155 /* Note: touch->id range is 1 to 15; slots are 0 to 14. */
1156 int slot = touch->id - 1;
1157
1158 input_mt_slot(input, slot);
1159 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
1160 input_report_abs(input, ABS_MT_POSITION_X,
1161 ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
1162 input_report_abs(input, ABS_MT_POSITION_Y,
1163 ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
1164 input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
1165 }
1166
1167 input_mt_sync_frame(input);
1168
1169 if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
1170 input_report_key(input, BTN_LEFT,
1171 !!(data->finger_btn & OP_DATA_LEFT_BTN));
1172 if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
1173 input_report_key(input, BTN_MIDDLE,
1174 !!(data->finger_btn & OP_DATA_MIDDLE_BTN));
1175 if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
1176 input_report_key(input, BTN_RIGHT,
1177 !!(data->finger_btn & OP_DATA_RIGHT_BTN));
1178 input_sync(input);
1179
1180 return 0;
1181 }
1182
cyapa_gen3_irq_handler(struct cyapa * cyapa)1183 static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
1184 {
1185 struct device *dev = &cyapa->client->dev;
1186 struct cyapa_reg_data data;
1187 int ret;
1188
1189 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1190 if (ret != sizeof(data)) {
1191 dev_err(dev, "failed to read report data, (%d)\n", ret);
1192 return -EINVAL;
1193 }
1194
1195 if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1196 (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1197 (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
1198 dev_err(dev, "invalid device state bytes: %02x %02x\n",
1199 data.device_status, data.finger_btn);
1200 return -EINVAL;
1201 }
1202
1203 return cyapa_gen3_event_process(cyapa, &data);
1204 }
1205
1206 /*
1207 * This function will be called in the cyapa_gen3_set_power_mode function,
1208 * and it's known that it may failed in some situation after the set power
1209 * mode command was sent. So this function is aimed to avoid the knwon
1210 * and unwanted output I2C and data parse error messages.
1211 */
cyapa_gen3_try_poll_handler(struct cyapa * cyapa)1212 static int cyapa_gen3_try_poll_handler(struct cyapa *cyapa)
1213 {
1214 struct cyapa_reg_data data;
1215 int ret;
1216
1217 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1218 if (ret != sizeof(data))
1219 return -EINVAL;
1220
1221 if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1222 (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1223 (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID)
1224 return -EINVAL;
1225
1226 return cyapa_gen3_event_process(cyapa, &data);
1227
1228 }
1229
cyapa_gen3_initialize(struct cyapa * cyapa)1230 static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; }
cyapa_gen3_bl_initiate(struct cyapa * cyapa,const struct firmware * fw)1231 static int cyapa_gen3_bl_initiate(struct cyapa *cyapa,
1232 const struct firmware *fw) { return 0; }
cyapa_gen3_empty_output_data(struct cyapa * cyapa,u8 * buf,int * len,cb_sort func)1233 static int cyapa_gen3_empty_output_data(struct cyapa *cyapa,
1234 u8 *buf, int *len, cb_sort func) { return 0; }
1235
1236 const struct cyapa_dev_ops cyapa_gen3_ops = {
1237 .check_fw = cyapa_gen3_check_fw,
1238 .bl_enter = cyapa_gen3_bl_enter,
1239 .bl_activate = cyapa_gen3_bl_activate,
1240 .update_fw = cyapa_gen3_do_fw_update,
1241 .bl_deactivate = cyapa_gen3_bl_deactivate,
1242 .bl_initiate = cyapa_gen3_bl_initiate,
1243
1244 .show_baseline = cyapa_gen3_show_baseline,
1245 .calibrate_store = cyapa_gen3_do_calibrate,
1246
1247 .initialize = cyapa_gen3_initialize,
1248
1249 .state_parse = cyapa_gen3_state_parse,
1250 .operational_check = cyapa_gen3_do_operational_check,
1251
1252 .irq_handler = cyapa_gen3_irq_handler,
1253 .irq_cmd_handler = cyapa_gen3_irq_cmd_handler,
1254 .sort_empty_output_data = cyapa_gen3_empty_output_data,
1255 .set_power_mode = cyapa_gen3_set_power_mode,
1256
1257 .set_proximity = cyapa_gen3_set_proximity,
1258 };
1259