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[deliverable/linux.git] / drivers / input / mouse / cyapa_gen3.c
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) 2011-2014 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 /* for byte read/write command */
183 #define CMD_RESET 0
184 #define CMD_POWER_MODE 1
185 #define CMD_DEV_STATUS 2
186 #define CMD_REPORT_MAX_BASELINE 3
187 #define CMD_REPORT_MIN_BASELINE 4
188 #define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
189 #define CYAPA_SMBUS_RESET SMBUS_BYTE_CMD(CMD_RESET)
190 #define CYAPA_SMBUS_POWER_MODE SMBUS_BYTE_CMD(CMD_POWER_MODE)
191 #define CYAPA_SMBUS_DEV_STATUS SMBUS_BYTE_CMD(CMD_DEV_STATUS)
192 #define CYAPA_SMBUS_MAX_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE)
193 #define CYAPA_SMBUS_MIN_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE)
194
195 /* for group registers read/write command */
196 #define REG_GROUP_DATA 0
197 #define REG_GROUP_CMD 2
198 #define REG_GROUP_QUERY 3
199 #define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
200 #define CYAPA_SMBUS_GROUP_DATA SMBUS_GROUP_CMD(REG_GROUP_DATA)
201 #define CYAPA_SMBUS_GROUP_CMD SMBUS_GROUP_CMD(REG_GROUP_CMD)
202 #define CYAPA_SMBUS_GROUP_QUERY SMBUS_GROUP_CMD(REG_GROUP_QUERY)
203
204 /* for register block read/write command */
205 #define CMD_BL_STATUS 0
206 #define CMD_BL_HEAD 1
207 #define CMD_BL_CMD 2
208 #define CMD_BL_DATA 3
209 #define CMD_BL_ALL 4
210 #define CMD_BLK_PRODUCT_ID 5
211 #define CMD_BLK_HEAD 6
212 #define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
213
214 /* register block read/write command in bootloader mode */
215 #define CYAPA_SMBUS_BL_STATUS SMBUS_BLOCK_CMD(CMD_BL_STATUS)
216 #define CYAPA_SMBUS_BL_HEAD SMBUS_BLOCK_CMD(CMD_BL_HEAD)
217 #define CYAPA_SMBUS_BL_CMD SMBUS_BLOCK_CMD(CMD_BL_CMD)
218 #define CYAPA_SMBUS_BL_DATA SMBUS_BLOCK_CMD(CMD_BL_DATA)
219 #define CYAPA_SMBUS_BL_ALL SMBUS_BLOCK_CMD(CMD_BL_ALL)
220
221 /* register block read/write command in operational mode */
222 #define CYAPA_SMBUS_BLK_PRODUCT_ID SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
223 #define CYAPA_SMBUS_BLK_HEAD SMBUS_BLOCK_CMD(CMD_BLK_HEAD)
224
225 struct cyapa_cmd_len {
226 u8 cmd;
227 u8 len;
228 };
229
230 /* maps generic CYAPA_CMD_* code to the I2C equivalent */
231 static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
232 { CYAPA_OFFSET_SOFT_RESET, 1 }, /* CYAPA_CMD_SOFT_RESET */
233 { REG_OFFSET_COMMAND_BASE + 1, 1 }, /* CYAPA_CMD_POWER_MODE */
234 { REG_OFFSET_DATA_BASE, 1 }, /* CYAPA_CMD_DEV_STATUS */
235 { REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
236 /* CYAPA_CMD_GROUP_DATA */
237 { REG_OFFSET_COMMAND_BASE, 0 }, /* CYAPA_CMD_GROUP_CMD */
238 { REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE }, /* CYAPA_CMD_GROUP_QUERY */
239 { BL_HEAD_OFFSET, 3 }, /* CYAPA_CMD_BL_STATUS */
240 { BL_HEAD_OFFSET, 16 }, /* CYAPA_CMD_BL_HEAD */
241 { BL_HEAD_OFFSET, 16 }, /* CYAPA_CMD_BL_CMD */
242 { BL_DATA_OFFSET, 16 }, /* CYAPA_CMD_BL_DATA */
243 { BL_HEAD_OFFSET, 32 }, /* CYAPA_CMD_BL_ALL */
244 { REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
245 /* CYAPA_CMD_BLK_PRODUCT_ID */
246 { REG_OFFSET_DATA_BASE, 32 }, /* CYAPA_CMD_BLK_HEAD */
247 { REG_OFFSET_MAX_BASELINE, 1 }, /* CYAPA_CMD_MAX_BASELINE */
248 { REG_OFFSET_MIN_BASELINE, 1 }, /* CYAPA_CMD_MIN_BASELINE */
249 };
250
251 static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
252 { CYAPA_SMBUS_RESET, 1 }, /* CYAPA_CMD_SOFT_RESET */
253 { CYAPA_SMBUS_POWER_MODE, 1 }, /* CYAPA_CMD_POWER_MODE */
254 { CYAPA_SMBUS_DEV_STATUS, 1 }, /* CYAPA_CMD_DEV_STATUS */
255 { CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
256 /* CYAPA_CMD_GROUP_DATA */
257 { CYAPA_SMBUS_GROUP_CMD, 2 }, /* CYAPA_CMD_GROUP_CMD */
258 { CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
259 /* CYAPA_CMD_GROUP_QUERY */
260 { CYAPA_SMBUS_BL_STATUS, 3 }, /* CYAPA_CMD_BL_STATUS */
261 { CYAPA_SMBUS_BL_HEAD, 16 }, /* CYAPA_CMD_BL_HEAD */
262 { CYAPA_SMBUS_BL_CMD, 16 }, /* CYAPA_CMD_BL_CMD */
263 { CYAPA_SMBUS_BL_DATA, 16 }, /* CYAPA_CMD_BL_DATA */
264 { CYAPA_SMBUS_BL_ALL, 32 }, /* CYAPA_CMD_BL_ALL */
265 { CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
266 /* CYAPA_CMD_BLK_PRODUCT_ID */
267 { CYAPA_SMBUS_BLK_HEAD, 16 }, /* CYAPA_CMD_BLK_HEAD */
268 { CYAPA_SMBUS_MAX_BASELINE, 1 }, /* CYAPA_CMD_MAX_BASELINE */
269 { CYAPA_SMBUS_MIN_BASELINE, 1 }, /* CYAPA_CMD_MIN_BASELINE */
270 };
271
272
273 /*
274 * cyapa_smbus_read_block - perform smbus block read command
275 * @cyapa - private data structure of the driver
276 * @cmd - the properly encoded smbus command
277 * @len - expected length of smbus command result
278 * @values - buffer to store smbus command result
279 *
280 * Returns negative errno, else the number of bytes written.
281 *
282 * Note:
283 * In trackpad device, the memory block allocated for I2C register map
284 * is 256 bytes, so the max read block for I2C bus is 256 bytes.
285 */
286 ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
287 u8 *values)
288 {
289 ssize_t ret;
290 u8 index;
291 u8 smbus_cmd;
292 u8 *buf;
293 struct i2c_client *client = cyapa->client;
294
295 if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
296 return -EINVAL;
297
298 if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
299 /* read specific block registers command. */
300 smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
301 ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
302 goto out;
303 }
304
305 ret = 0;
306 for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
307 smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
308 smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
309 buf = values + I2C_SMBUS_BLOCK_MAX * index;
310 ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
311 if (ret < 0)
312 goto out;
313 }
314
315 out:
316 return ret > 0 ? len : ret;
317 }
318
319 static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
320 {
321 u8 cmd;
322
323 if (cyapa->smbus) {
324 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
325 cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
326 } else {
327 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
328 }
329 return i2c_smbus_read_byte_data(cyapa->client, cmd);
330 }
331
332 static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
333 {
334 u8 cmd;
335
336 if (cyapa->smbus) {
337 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
338 cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
339 } else {
340 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
341 }
342 return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
343 }
344
345 ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
346 u8 *values)
347 {
348 return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
349 }
350
351 static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
352 size_t len, const u8 *values)
353 {
354 return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
355 }
356
357 ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
358 {
359 u8 cmd;
360 size_t len;
361
362 if (cyapa->smbus) {
363 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
364 len = cyapa_smbus_cmds[cmd_idx].len;
365 return cyapa_smbus_read_block(cyapa, cmd, len, values);
366 }
367 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
368 len = cyapa_i2c_cmds[cmd_idx].len;
369 return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
370 }
371
372 /*
373 * Determine the Gen3 trackpad device's current operating state.
374 *
375 */
376 static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
377 {
378 cyapa->state = CYAPA_STATE_NO_DEVICE;
379
380 /* Parse based on Gen3 characteristic registers and bits */
381 if (reg_data[REG_BL_FILE] == BL_FILE &&
382 reg_data[REG_BL_ERROR] == BL_ERROR_NO_ERR_IDLE &&
383 (reg_data[REG_BL_STATUS] ==
384 (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID) ||
385 reg_data[REG_BL_STATUS] == BL_STATUS_RUNNING)) {
386 /*
387 * Normal state after power on or reset,
388 * REG_BL_STATUS == 0x11, firmware image checksum is valid.
389 * REG_BL_STATUS == 0x10, firmware image checksum is invalid.
390 */
391 cyapa->gen = CYAPA_GEN3;
392 cyapa->state = CYAPA_STATE_BL_IDLE;
393 } else if (reg_data[REG_BL_FILE] == BL_FILE &&
394 (reg_data[REG_BL_STATUS] & BL_STATUS_RUNNING) ==
395 BL_STATUS_RUNNING) {
396 cyapa->gen = CYAPA_GEN3;
397 if (reg_data[REG_BL_STATUS] & BL_STATUS_BUSY) {
398 cyapa->state = CYAPA_STATE_BL_BUSY;
399 } else {
400 if ((reg_data[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) ==
401 BL_ERROR_BOOTLOADING)
402 cyapa->state = CYAPA_STATE_BL_ACTIVE;
403 else
404 cyapa->state = CYAPA_STATE_BL_IDLE;
405 }
406 } else if ((reg_data[REG_OP_STATUS] & OP_STATUS_SRC) &&
407 (reg_data[REG_OP_DATA1] & OP_DATA_VALID)) {
408 /*
409 * Normal state when running in operational mode,
410 * may also not in full power state or
411 * busying in command process.
412 */
413 if (GEN3_FINGER_NUM(reg_data[REG_OP_DATA1]) <=
414 GEN3_MAX_FINGERS) {
415 /* Finger number data is valid. */
416 cyapa->gen = CYAPA_GEN3;
417 cyapa->state = CYAPA_STATE_OP;
418 }
419 } else if (reg_data[REG_OP_STATUS] == 0x0C &&
420 reg_data[REG_OP_DATA1] == 0x08) {
421 /* Op state when first two registers overwritten with 0x00 */
422 cyapa->gen = CYAPA_GEN3;
423 cyapa->state = CYAPA_STATE_OP;
424 } else if (reg_data[REG_BL_STATUS] &
425 (BL_STATUS_RUNNING | BL_STATUS_BUSY)) {
426 cyapa->gen = CYAPA_GEN3;
427 cyapa->state = CYAPA_STATE_BL_BUSY;
428 }
429
430 if (cyapa->gen == CYAPA_GEN3 && (cyapa->state == CYAPA_STATE_OP ||
431 cyapa->state == CYAPA_STATE_BL_IDLE ||
432 cyapa->state == CYAPA_STATE_BL_ACTIVE ||
433 cyapa->state == CYAPA_STATE_BL_BUSY))
434 return 0;
435
436 return -EAGAIN;
437 }
438
439 /*
440 * Enter bootloader by soft resetting the device.
441 *
442 * If device is already in the bootloader, the function just returns.
443 * Otherwise, reset the device; after reset, device enters bootloader idle
444 * state immediately.
445 *
446 * Returns:
447 * 0 on success
448 * -EAGAIN device was reset, but is not now in bootloader idle state
449 * < 0 if the device never responds within the timeout
450 */
451 static int cyapa_gen3_bl_enter(struct cyapa *cyapa)
452 {
453 int error;
454 int waiting_time;
455
456 error = cyapa_poll_state(cyapa, 500);
457 if (error)
458 return error;
459 if (cyapa->state == CYAPA_STATE_BL_IDLE) {
460 /* Already in BL_IDLE. Skipping reset. */
461 return 0;
462 }
463
464 if (cyapa->state != CYAPA_STATE_OP)
465 return -EAGAIN;
466
467 cyapa->operational = false;
468 cyapa->state = CYAPA_STATE_NO_DEVICE;
469 error = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, 0x01);
470 if (error)
471 return -EIO;
472
473 usleep_range(25000, 50000);
474 waiting_time = 2000; /* For some shipset, max waiting time is 1~2s. */
475 do {
476 error = cyapa_poll_state(cyapa, 500);
477 if (error) {
478 if (error == -ETIMEDOUT) {
479 waiting_time -= 500;
480 continue;
481 }
482 return error;
483 }
484
485 if ((cyapa->state == CYAPA_STATE_BL_IDLE) &&
486 !(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
487 break;
488
489 msleep(100);
490 waiting_time -= 100;
491 } while (waiting_time > 0);
492
493 if ((cyapa->state != CYAPA_STATE_BL_IDLE) ||
494 (cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
495 return -EAGAIN;
496
497 return 0;
498 }
499
500 static int cyapa_gen3_bl_activate(struct cyapa *cyapa)
501 {
502 int error;
503
504 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_activate),
505 bl_activate);
506 if (error)
507 return error;
508
509 /* Wait for bootloader to activate; takes between 2 and 12 seconds */
510 msleep(2000);
511 error = cyapa_poll_state(cyapa, 11000);
512 if (error)
513 return error;
514 if (cyapa->state != CYAPA_STATE_BL_ACTIVE)
515 return -EAGAIN;
516
517 return 0;
518 }
519
520 static int cyapa_gen3_bl_deactivate(struct cyapa *cyapa)
521 {
522 int error;
523
524 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
525 bl_deactivate);
526 if (error)
527 return error;
528
529 /* Wait for bootloader to switch to idle state; should take < 100ms */
530 msleep(100);
531 error = cyapa_poll_state(cyapa, 500);
532 if (error)
533 return error;
534 if (cyapa->state != CYAPA_STATE_BL_IDLE)
535 return -EAGAIN;
536 return 0;
537 }
538
539 /*
540 * Exit bootloader
541 *
542 * Send bl_exit command, then wait 50 - 100 ms to let device transition to
543 * operational mode. If this is the first time the device's firmware is
544 * running, it can take up to 2 seconds to calibrate its sensors. So, poll
545 * the device's new state for up to 2 seconds.
546 *
547 * Returns:
548 * -EIO failure while reading from device
549 * -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
550 * 0 device is supported and in operational mode
551 */
552 static int cyapa_gen3_bl_exit(struct cyapa *cyapa)
553 {
554 int error;
555
556 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
557 if (error)
558 return error;
559
560 /*
561 * Wait for bootloader to exit, and operation mode to start.
562 * Normally, this takes at least 50 ms.
563 */
564 usleep_range(50000, 100000);
565 /*
566 * In addition, when a device boots for the first time after being
567 * updated to new firmware, it must first calibrate its sensors, which
568 * can take up to an additional 2 seconds. If the device power is
569 * running low, this may take even longer.
570 */
571 error = cyapa_poll_state(cyapa, 4000);
572 if (error < 0)
573 return error;
574 if (cyapa->state != CYAPA_STATE_OP)
575 return -EAGAIN;
576
577 return 0;
578 }
579
580 static u16 cyapa_gen3_csum(const u8 *buf, size_t count)
581 {
582 int i;
583 u16 csum = 0;
584
585 for (i = 0; i < count; i++)
586 csum += buf[i];
587
588 return csum;
589 }
590
591 /*
592 * Verify the integrity of a CYAPA firmware image file.
593 *
594 * The firmware image file is 30848 bytes, composed of 482 64-byte blocks.
595 *
596 * The first 2 blocks are the firmware header.
597 * The next 480 blocks are the firmware image.
598 *
599 * The first two bytes of the header hold the header checksum, computed by
600 * summing the other 126 bytes of the header.
601 * The last two bytes of the header hold the firmware image checksum, computed
602 * by summing the 30720 bytes of the image modulo 0xffff.
603 *
604 * Both checksums are stored little-endian.
605 */
606 static int cyapa_gen3_check_fw(struct cyapa *cyapa, const struct firmware *fw)
607 {
608 struct device *dev = &cyapa->client->dev;
609 u16 csum;
610 u16 csum_expected;
611
612 /* Firmware must match exact 30848 bytes = 482 64-byte blocks. */
613 if (fw->size != CYAPA_FW_SIZE) {
614 dev_err(dev, "invalid firmware size = %zu, expected %u.\n",
615 fw->size, CYAPA_FW_SIZE);
616 return -EINVAL;
617 }
618
619 /* Verify header block */
620 csum_expected = (fw->data[0] << 8) | fw->data[1];
621 csum = cyapa_gen3_csum(&fw->data[2], CYAPA_FW_HDR_SIZE - 2);
622 if (csum != csum_expected) {
623 dev_err(dev, "%s %04x, expected: %04x\n",
624 "invalid firmware header checksum = ",
625 csum, csum_expected);
626 return -EINVAL;
627 }
628
629 /* Verify firmware image */
630 csum_expected = (fw->data[CYAPA_FW_HDR_SIZE - 2] << 8) |
631 fw->data[CYAPA_FW_HDR_SIZE - 1];
632 csum = cyapa_gen3_csum(&fw->data[CYAPA_FW_HDR_SIZE],
633 CYAPA_FW_DATA_SIZE);
634 if (csum != csum_expected) {
635 dev_err(dev, "%s %04x, expected: %04x\n",
636 "invalid firmware header checksum = ",
637 csum, csum_expected);
638 return -EINVAL;
639 }
640 return 0;
641 }
642
643 /*
644 * Write a |len| byte long buffer |buf| to the device, by chopping it up into a
645 * sequence of smaller |CYAPA_CMD_LEN|-length write commands.
646 *
647 * The data bytes for a write command are prepended with the 1-byte offset
648 * of the data relative to the start of |buf|.
649 */
650 static int cyapa_gen3_write_buffer(struct cyapa *cyapa,
651 const u8 *buf, size_t len)
652 {
653 int error;
654 size_t i;
655 unsigned char cmd[CYAPA_CMD_LEN + 1];
656 size_t cmd_len;
657
658 for (i = 0; i < len; i += CYAPA_CMD_LEN) {
659 const u8 *payload = &buf[i];
660
661 cmd_len = (len - i >= CYAPA_CMD_LEN) ? CYAPA_CMD_LEN : len - i;
662 cmd[0] = i;
663 memcpy(&cmd[1], payload, cmd_len);
664
665 error = cyapa_i2c_reg_write_block(cyapa, 0, cmd_len + 1, cmd);
666 if (error)
667 return error;
668 }
669 return 0;
670 }
671
672 /*
673 * A firmware block write command writes 64 bytes of data to a single flash
674 * page in the device. The 78-byte block write command has the format:
675 * <0xff> <CMD> <Key> <Start> <Data> <Data-Checksum> <CMD Checksum>
676 *
677 * <0xff> - every command starts with 0xff
678 * <CMD> - the write command value is 0x39
679 * <Key> - write commands include an 8-byte key: { 00 01 02 03 04 05 06 07 }
680 * <Block> - Memory Block number (address / 64) (16-bit, big-endian)
681 * <Data> - 64 bytes of firmware image data
682 * <Data Checksum> - sum of 64 <Data> bytes, modulo 0xff
683 * <CMD Checksum> - sum of 77 bytes, from 0xff to <Data Checksum>
684 *
685 * Each write command is split into 5 i2c write transactions of up to 16 bytes.
686 * Each transaction starts with an i2c register offset: (00, 10, 20, 30, 40).
687 */
688 static int cyapa_gen3_write_fw_block(struct cyapa *cyapa,
689 u16 block, const u8 *data)
690 {
691 int ret;
692 struct gen3_write_block_cmd write_block_cmd;
693 u8 status[BL_STATUS_SIZE];
694 int tries;
695 u8 bl_status, bl_error;
696
697 /* Set write command and security key bytes. */
698 write_block_cmd.checksum_seed = GEN3_BL_CMD_CHECKSUM_SEED;
699 write_block_cmd.cmd_code = GEN3_BL_CMD_WRITE_BLOCK;
700 memcpy(write_block_cmd.key, security_key, sizeof(security_key));
701 put_unaligned_be16(block, &write_block_cmd.block_num);
702 memcpy(write_block_cmd.block_data, data, CYAPA_FW_BLOCK_SIZE);
703 write_block_cmd.block_checksum = cyapa_gen3_csum(
704 write_block_cmd.block_data, CYAPA_FW_BLOCK_SIZE);
705 write_block_cmd.cmd_checksum = cyapa_gen3_csum((u8 *)&write_block_cmd,
706 sizeof(write_block_cmd) - 1);
707
708 ret = cyapa_gen3_write_buffer(cyapa, (u8 *)&write_block_cmd,
709 sizeof(write_block_cmd));
710 if (ret)
711 return ret;
712
713 /* Wait for write to finish */
714 tries = 11; /* Programming for one block can take about 100ms. */
715 do {
716 usleep_range(10000, 20000);
717
718 /* Check block write command result status. */
719 ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET,
720 BL_STATUS_SIZE, status);
721 if (ret != BL_STATUS_SIZE)
722 return (ret < 0) ? ret : -EIO;
723 } while ((status[REG_BL_STATUS] & BL_STATUS_BUSY) && --tries);
724
725 /* Ignore WATCHDOG bit and reserved bits. */
726 bl_status = status[REG_BL_STATUS] & ~BL_STATUS_REV_MASK;
727 bl_error = status[REG_BL_ERROR] & ~BL_ERROR_RESERVED;
728
729 if (bl_status & BL_STATUS_BUSY)
730 ret = -ETIMEDOUT;
731 else if (bl_status != BL_STATUS_RUNNING ||
732 bl_error != BL_ERROR_BOOTLOADING)
733 ret = -EIO;
734 else
735 ret = 0;
736
737 return ret;
738 }
739
740 static int cyapa_gen3_write_blocks(struct cyapa *cyapa,
741 size_t start_block, size_t block_count,
742 const u8 *image_data)
743 {
744 int error;
745 int i;
746
747 for (i = 0; i < block_count; i++) {
748 size_t block = start_block + i;
749 size_t addr = i * CYAPA_FW_BLOCK_SIZE;
750 const u8 *data = &image_data[addr];
751
752 error = cyapa_gen3_write_fw_block(cyapa, block, data);
753 if (error)
754 return error;
755 }
756 return 0;
757 }
758
759 static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
760 const struct firmware *fw)
761 {
762 struct device *dev = &cyapa->client->dev;
763 int error;
764
765 /* First write data, starting at byte 128 of fw->data */
766 error = cyapa_gen3_write_blocks(cyapa,
767 CYAPA_FW_DATA_BLOCK_START, CYAPA_FW_DATA_BLOCK_COUNT,
768 &fw->data[CYAPA_FW_HDR_BLOCK_COUNT * CYAPA_FW_BLOCK_SIZE]);
769 if (error) {
770 dev_err(dev, "FW update aborted, write image: %d\n", error);
771 return error;
772 }
773
774 /* Then write checksum */
775 error = cyapa_gen3_write_blocks(cyapa,
776 CYAPA_FW_HDR_BLOCK_START, CYAPA_FW_HDR_BLOCK_COUNT,
777 &fw->data[0]);
778 if (error) {
779 dev_err(dev, "FW update aborted, write checksum: %d\n", error);
780 return error;
781 }
782
783 return 0;
784 }
785
786 static ssize_t cyapa_gen3_do_calibrate(struct device *dev,
787 struct device_attribute *attr,
788 const char *buf, size_t count)
789 {
790 struct cyapa *cyapa = dev_get_drvdata(dev);
791 int tries;
792 int ret;
793
794 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
795 if (ret < 0) {
796 dev_err(dev, "Error reading dev status: %d\n", ret);
797 goto out;
798 }
799 if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
800 dev_warn(dev, "Trackpad device is busy, device state: 0x%02x\n",
801 ret);
802 ret = -EAGAIN;
803 goto out;
804 }
805
806 ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
807 OP_RECALIBRATION_MASK);
808 if (ret < 0) {
809 dev_err(dev, "Failed to send calibrate command: %d\n",
810 ret);
811 goto out;
812 }
813
814 tries = 20; /* max recalibration timeout 2s. */
815 do {
816 /*
817 * For this recalibration, the max time will not exceed 2s.
818 * The average time is approximately 500 - 700 ms, and we
819 * will check the status every 100 - 200ms.
820 */
821 usleep_range(100000, 200000);
822
823 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
824 if (ret < 0) {
825 dev_err(dev, "Error reading dev status: %d\n",
826 ret);
827 goto out;
828 }
829 if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
830 break;
831 } while (--tries);
832
833 if (tries == 0) {
834 dev_err(dev, "Failed to calibrate. Timeout.\n");
835 ret = -ETIMEDOUT;
836 goto out;
837 }
838 dev_dbg(dev, "Calibration successful.\n");
839
840 out:
841 return ret < 0 ? ret : count;
842 }
843
844 static ssize_t cyapa_gen3_show_baseline(struct device *dev,
845 struct device_attribute *attr, char *buf)
846 {
847 struct cyapa *cyapa = dev_get_drvdata(dev);
848 int max_baseline, min_baseline;
849 int tries;
850 int ret;
851
852 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
853 if (ret < 0) {
854 dev_err(dev, "Error reading dev status. err = %d\n", ret);
855 goto out;
856 }
857 if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
858 dev_warn(dev, "Trackpad device is busy. device state = 0x%x\n",
859 ret);
860 ret = -EAGAIN;
861 goto out;
862 }
863
864 ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
865 OP_REPORT_BASELINE_MASK);
866 if (ret < 0) {
867 dev_err(dev, "Failed to send report baseline command. %d\n",
868 ret);
869 goto out;
870 }
871
872 tries = 3; /* Try for 30 to 60 ms */
873 do {
874 usleep_range(10000, 20000);
875
876 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
877 if (ret < 0) {
878 dev_err(dev, "Error reading dev status. err = %d\n",
879 ret);
880 goto out;
881 }
882 if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
883 break;
884 } while (--tries);
885
886 if (tries == 0) {
887 dev_err(dev, "Device timed out going to Normal state.\n");
888 ret = -ETIMEDOUT;
889 goto out;
890 }
891
892 ret = cyapa_read_byte(cyapa, CYAPA_CMD_MAX_BASELINE);
893 if (ret < 0) {
894 dev_err(dev, "Failed to read max baseline. err = %d\n", ret);
895 goto out;
896 }
897 max_baseline = ret;
898
899 ret = cyapa_read_byte(cyapa, CYAPA_CMD_MIN_BASELINE);
900 if (ret < 0) {
901 dev_err(dev, "Failed to read min baseline. err = %d\n", ret);
902 goto out;
903 }
904 min_baseline = ret;
905
906 dev_dbg(dev, "Baseline report successful. Max: %d Min: %d\n",
907 max_baseline, min_baseline);
908 ret = scnprintf(buf, PAGE_SIZE, "%d %d\n", max_baseline, min_baseline);
909
910 out:
911 return ret;
912 }
913
914 /*
915 * cyapa_get_wait_time_for_pwr_cmd
916 *
917 * Compute the amount of time we need to wait after updating the touchpad
918 * power mode. The touchpad needs to consume the incoming power mode set
919 * command at the current clock rate.
920 */
921
922 static u16 cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode)
923 {
924 switch (pwr_mode) {
925 case PWR_MODE_FULL_ACTIVE: return 20;
926 case PWR_MODE_BTN_ONLY: return 20;
927 case PWR_MODE_OFF: return 20;
928 default: return cyapa_pwr_cmd_to_sleep_time(pwr_mode) + 50;
929 }
930 }
931
932 /*
933 * Set device power mode
934 *
935 * Write to the field to configure power state. Power states include :
936 * Full : Max scans and report rate.
937 * Idle : Report rate set by user specified time.
938 * ButtonOnly : No scans for fingers. When the button is triggered,
939 * a slave interrupt is asserted to notify host to wake up.
940 * Off : Only awake for i2c commands from host. No function for button
941 * or touch sensors.
942 *
943 * The power_mode command should conform to the following :
944 * Full : 0x3f
945 * Idle : Configurable from 20 to 1000ms. See note below for
946 * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
947 * ButtonOnly : 0x01
948 * Off : 0x00
949 *
950 * Device power mode can only be set when device is in operational mode.
951 */
952 static int cyapa_gen3_set_power_mode(struct cyapa *cyapa, u8 power_mode,
953 u16 always_unused)
954 {
955 int ret;
956 u8 power;
957 int tries;
958 u16 sleep_time;
959
960 if (cyapa->state != CYAPA_STATE_OP)
961 return 0;
962
963 tries = SET_POWER_MODE_TRIES;
964 while (tries--) {
965 ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
966 if (ret >= 0)
967 break;
968 usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
969 }
970 if (ret < 0)
971 return ret;
972
973 /*
974 * Return early if the power mode to set is the same as the current
975 * one.
976 */
977 if ((ret & PWR_MODE_MASK) == power_mode)
978 return 0;
979
980 sleep_time = cyapa_get_wait_time_for_pwr_cmd(ret & PWR_MODE_MASK);
981 power = ret;
982 power &= ~PWR_MODE_MASK;
983 power |= power_mode & PWR_MODE_MASK;
984 tries = SET_POWER_MODE_TRIES;
985 while (tries--) {
986 ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
987 if (!ret)
988 break;
989 usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
990 }
991
992 /*
993 * Wait for the newly set power command to go in at the previous
994 * clock speed (scanrate) used by the touchpad firmware. Not
995 * doing so before issuing the next command may result in errors
996 * depending on the command's content.
997 */
998 msleep(sleep_time);
999 return ret;
1000 }
1001
1002 static int cyapa_gen3_get_query_data(struct cyapa *cyapa)
1003 {
1004 u8 query_data[QUERY_DATA_SIZE];
1005 int ret;
1006
1007 if (cyapa->state != CYAPA_STATE_OP)
1008 return -EBUSY;
1009
1010 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
1011 if (ret != QUERY_DATA_SIZE)
1012 return (ret < 0) ? ret : -EIO;
1013
1014 memcpy(&cyapa->product_id[0], &query_data[0], 5);
1015 cyapa->product_id[5] = '-';
1016 memcpy(&cyapa->product_id[6], &query_data[5], 6);
1017 cyapa->product_id[12] = '-';
1018 memcpy(&cyapa->product_id[13], &query_data[11], 2);
1019 cyapa->product_id[15] = '\0';
1020
1021 cyapa->fw_maj_ver = query_data[15];
1022 cyapa->fw_min_ver = query_data[16];
1023
1024 cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
1025
1026 cyapa->gen = query_data[20] & 0x0f;
1027
1028 cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
1029 cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
1030
1031 cyapa->physical_size_x =
1032 ((query_data[24] & 0xf0) << 4) | query_data[25];
1033 cyapa->physical_size_y =
1034 ((query_data[24] & 0x0f) << 8) | query_data[26];
1035
1036 cyapa->max_z = 255;
1037
1038 return 0;
1039 }
1040
1041 static int cyapa_gen3_bl_query_data(struct cyapa *cyapa)
1042 {
1043 u8 bl_data[CYAPA_CMD_LEN];
1044 int ret;
1045
1046 ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data);
1047 if (ret != CYAPA_CMD_LEN)
1048 return (ret < 0) ? ret : -EIO;
1049
1050 /*
1051 * This value will be updated again when entered application mode.
1052 * If TP failed to enter application mode, this fw version values
1053 * can be used as a reference.
1054 * This firmware version valid when fw image checksum is valid.
1055 */
1056 if (bl_data[REG_BL_STATUS] ==
1057 (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) {
1058 cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET];
1059 cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET];
1060 }
1061
1062 return 0;
1063 }
1064
1065 /*
1066 * Check if device is operational.
1067 *
1068 * An operational device is responding, has exited bootloader, and has
1069 * firmware supported by this driver.
1070 *
1071 * Returns:
1072 * -EBUSY no device or in bootloader
1073 * -EIO failure while reading from device
1074 * -EAGAIN device is still in bootloader
1075 * if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
1076 * -EINVAL device is in operational mode, but not supported by this driver
1077 * 0 device is supported
1078 */
1079 static int cyapa_gen3_do_operational_check(struct cyapa *cyapa)
1080 {
1081 struct device *dev = &cyapa->client->dev;
1082 int error;
1083
1084 switch (cyapa->state) {
1085 case CYAPA_STATE_BL_ACTIVE:
1086 error = cyapa_gen3_bl_deactivate(cyapa);
1087 if (error) {
1088 dev_err(dev, "failed to bl_deactivate: %d\n", error);
1089 return error;
1090 }
1091
1092 /* Fallthrough state */
1093 case CYAPA_STATE_BL_IDLE:
1094 /* Try to get firmware version in bootloader mode. */
1095 cyapa_gen3_bl_query_data(cyapa);
1096
1097 error = cyapa_gen3_bl_exit(cyapa);
1098 if (error) {
1099 dev_err(dev, "failed to bl_exit: %d\n", error);
1100 return error;
1101 }
1102
1103 /* Fallthrough state */
1104 case CYAPA_STATE_OP:
1105 /*
1106 * Reading query data before going back to the full mode
1107 * may cause problems, so we set the power mode first here.
1108 */
1109 error = cyapa_gen3_set_power_mode(cyapa,
1110 PWR_MODE_FULL_ACTIVE, 0);
1111 if (error)
1112 dev_err(dev, "%s: set full power mode failed: %d\n",
1113 __func__, error);
1114 error = cyapa_gen3_get_query_data(cyapa);
1115 if (error < 0)
1116 return error;
1117
1118 /* Only support firmware protocol gen3 */
1119 if (cyapa->gen != CYAPA_GEN3) {
1120 dev_err(dev, "unsupported protocol version (%d)",
1121 cyapa->gen);
1122 return -EINVAL;
1123 }
1124
1125 /* Only support product ID starting with CYTRA */
1126 if (memcmp(cyapa->product_id, product_id,
1127 strlen(product_id)) != 0) {
1128 dev_err(dev, "unsupported product ID (%s)\n",
1129 cyapa->product_id);
1130 return -EINVAL;
1131 }
1132
1133 return 0;
1134
1135 default:
1136 return -EIO;
1137 }
1138 return 0;
1139 }
1140
1141 /*
1142 * Return false, do not continue process
1143 * Return true, continue process.
1144 */
1145 static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa)
1146 {
1147 /* Not gen3 irq command response, skip for continue. */
1148 if (cyapa->gen != CYAPA_GEN3)
1149 return true;
1150
1151 if (cyapa->operational)
1152 return true;
1153
1154 /*
1155 * Driver in detecting or other interface function processing,
1156 * so, stop cyapa_gen3_irq_handler to continue process to
1157 * avoid unwanted to error detecting and processing.
1158 *
1159 * And also, avoid the periodicly accerted interrupts to be processed
1160 * as touch inputs when gen3 failed to launch into application mode,
1161 * which will cause gen3 stays in bootloader mode.
1162 */
1163 return false;
1164 }
1165
1166 static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
1167 {
1168 struct input_dev *input = cyapa->input;
1169 struct device *dev = &cyapa->client->dev;
1170 struct cyapa_reg_data data;
1171 int num_fingers;
1172 int ret;
1173 int i;
1174
1175 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1176 if (ret != sizeof(data)) {
1177 dev_err(dev, "failed to read report data, (%d)\n", ret);
1178 return -EINVAL;
1179 }
1180
1181 if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1182 (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1183 (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
1184 dev_err(dev, "invalid device state bytes, %02x %02x\n",
1185 data.device_status, data.finger_btn);
1186 return -EINVAL;
1187 }
1188
1189 num_fingers = (data.finger_btn >> 4) & 0x0f;
1190 for (i = 0; i < num_fingers; i++) {
1191 const struct cyapa_touch *touch = &data.touches[i];
1192 /* Note: touch->id range is 1 to 15; slots are 0 to 14. */
1193 int slot = touch->id - 1;
1194
1195 input_mt_slot(input, slot);
1196 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
1197 input_report_abs(input, ABS_MT_POSITION_X,
1198 ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
1199 input_report_abs(input, ABS_MT_POSITION_Y,
1200 ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
1201 input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
1202 }
1203
1204 input_mt_sync_frame(input);
1205
1206 if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
1207 input_report_key(input, BTN_LEFT,
1208 !!(data.finger_btn & OP_DATA_LEFT_BTN));
1209 if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
1210 input_report_key(input, BTN_MIDDLE,
1211 !!(data.finger_btn & OP_DATA_MIDDLE_BTN));
1212 if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
1213 input_report_key(input, BTN_RIGHT,
1214 !!(data.finger_btn & OP_DATA_RIGHT_BTN));
1215 input_sync(input);
1216
1217 return 0;
1218 }
1219
1220 static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; }
1221 static int cyapa_gen3_bl_initiate(struct cyapa *cyapa,
1222 const struct firmware *fw) { return 0; }
1223 static int cyapa_gen3_empty_output_data(struct cyapa *cyapa,
1224 u8 *buf, int *len, cb_sort func) { return 0; }
1225
1226 const struct cyapa_dev_ops cyapa_gen3_ops = {
1227 .check_fw = cyapa_gen3_check_fw,
1228 .bl_enter = cyapa_gen3_bl_enter,
1229 .bl_activate = cyapa_gen3_bl_activate,
1230 .update_fw = cyapa_gen3_do_fw_update,
1231 .bl_deactivate = cyapa_gen3_bl_deactivate,
1232 .bl_initiate = cyapa_gen3_bl_initiate,
1233
1234 .show_baseline = cyapa_gen3_show_baseline,
1235 .calibrate_store = cyapa_gen3_do_calibrate,
1236
1237 .initialize = cyapa_gen3_initialize,
1238
1239 .state_parse = cyapa_gen3_state_parse,
1240 .operational_check = cyapa_gen3_do_operational_check,
1241
1242 .irq_handler = cyapa_gen3_irq_handler,
1243 .irq_cmd_handler = cyapa_gen3_irq_cmd_handler,
1244 .sort_empty_output_data = cyapa_gen3_empty_output_data,
1245 .set_power_mode = cyapa_gen3_set_power_mode,
1246 };
Linux kernel - Deliverables
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