2 * Cypress APA trackpad with I2C interface
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>
9 * Copyright (C) 2011-2015 Cypress Semiconductor, Inc.
10 * Copyright (C) 2011-2012 Google, Inc.
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
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>
27 #define GEN3_MAX_FINGERS 5
28 #define GEN3_FINGER_NUM(x) (((x) >> 4) & 0x07)
30 #define BLK_HEAD_BYTES 32
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
37 #define REG_OFFSET_DATA_BASE 0x0000
38 #define REG_OFFSET_COMMAND_BASE 0x0028
39 #define REG_OFFSET_QUERY_BASE 0x002a
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
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
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
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.
63 #define CYAPA_DEV_NORMAL 0x03
64 #define CYAPA_DEV_BUSY 0x01
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 * \
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 * \
78 #define CYAPA_FW_SIZE (CYAPA_FW_HDR_SIZE + CYAPA_FW_DATA_SIZE)
79 #define CYAPA_CMD_LEN 16
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)
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
92 u8 x_lo; /* low 8 bits of x position value. */
93 u8 y_lo; /* low 8 bits of y position value. */
95 /* id range is 1 - 15. It is incremented with every new touch. */
99 struct cyapa_reg_data {
101 * bit 0 - 1: device status
102 * bit 3 - 2: power mode
103 * bit 6 - 4: reserved
104 * bit 7: interrupt valid bit
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
115 /* CYAPA reports up to 5 touches per packet. */
116 struct cyapa_touch touches[5];
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 */
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 */
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,
139 /* for byte read/write command */
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)
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)
161 /* for register block read/write command */
162 #define CMD_BL_STATUS 0
163 #define CMD_BL_HEAD 1
165 #define CMD_BL_DATA 3
167 #define CMD_BLK_PRODUCT_ID 5
168 #define CMD_BLK_HEAD 6
169 #define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
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)
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)
182 /* for byte read/write command */
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)
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)
204 /* for register block read/write command */
205 #define CMD_BL_STATUS 0
206 #define CMD_BL_HEAD 1
208 #define CMD_BL_DATA 3
210 #define CMD_BLK_PRODUCT_ID 5
211 #define CMD_BLK_HEAD 6
212 #define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
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)
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)
225 struct cyapa_cmd_len {
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 */
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 */
272 static int cyapa_gen3_try_poll_handler(struct cyapa *cyapa);
275 * cyapa_smbus_read_block - perform smbus block read command
276 * @cyapa - private data structure of the driver
277 * @cmd - the properly encoded smbus command
278 * @len - expected length of smbus command result
279 * @values - buffer to store smbus command result
281 * Returns negative errno, else the number of bytes written.
284 * In trackpad device, the memory block allocated for I2C register map
285 * is 256 bytes, so the max read block for I2C bus is 256 bytes.
287 ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
294 struct i2c_client *client = cyapa->client;
296 if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
299 if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
300 /* read specific block registers command. */
301 smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
302 ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
307 for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
308 smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
309 smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
310 buf = values + I2C_SMBUS_BLOCK_MAX * index;
311 ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
317 return ret > 0 ? len : ret;
320 static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
325 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
326 cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
328 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
330 return i2c_smbus_read_byte_data(cyapa->client, cmd);
333 static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
338 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
339 cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
341 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
343 return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
346 ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
349 return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
352 static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
353 size_t len, const u8 *values)
355 return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
358 ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
364 cmd = cyapa_smbus_cmds[cmd_idx].cmd;
365 len = cyapa_smbus_cmds[cmd_idx].len;
366 return cyapa_smbus_read_block(cyapa, cmd, len, values);
368 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
369 len = cyapa_i2c_cmds[cmd_idx].len;
370 return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
374 * Determine the Gen3 trackpad device's current operating state.
377 static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
379 cyapa->state = CYAPA_STATE_NO_DEVICE;
381 /* Parse based on Gen3 characteristic registers and bits */
382 if (reg_data[REG_BL_FILE] == BL_FILE &&
383 reg_data[REG_BL_ERROR] == BL_ERROR_NO_ERR_IDLE &&
384 (reg_data[REG_BL_STATUS] ==
385 (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID) ||
386 reg_data[REG_BL_STATUS] == BL_STATUS_RUNNING)) {
388 * Normal state after power on or reset,
389 * REG_BL_STATUS == 0x11, firmware image checksum is valid.
390 * REG_BL_STATUS == 0x10, firmware image checksum is invalid.
392 cyapa->gen = CYAPA_GEN3;
393 cyapa->state = CYAPA_STATE_BL_IDLE;
394 } else if (reg_data[REG_BL_FILE] == BL_FILE &&
395 (reg_data[REG_BL_STATUS] & BL_STATUS_RUNNING) ==
397 cyapa->gen = CYAPA_GEN3;
398 if (reg_data[REG_BL_STATUS] & BL_STATUS_BUSY) {
399 cyapa->state = CYAPA_STATE_BL_BUSY;
401 if ((reg_data[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) ==
402 BL_ERROR_BOOTLOADING)
403 cyapa->state = CYAPA_STATE_BL_ACTIVE;
405 cyapa->state = CYAPA_STATE_BL_IDLE;
407 } else if ((reg_data[REG_OP_STATUS] & OP_STATUS_SRC) &&
408 (reg_data[REG_OP_DATA1] & OP_DATA_VALID)) {
410 * Normal state when running in operational mode,
411 * may also not in full power state or
412 * busying in command process.
414 if (GEN3_FINGER_NUM(reg_data[REG_OP_DATA1]) <=
416 /* Finger number data is valid. */
417 cyapa->gen = CYAPA_GEN3;
418 cyapa->state = CYAPA_STATE_OP;
420 } else if (reg_data[REG_OP_STATUS] == 0x0C &&
421 reg_data[REG_OP_DATA1] == 0x08) {
422 /* Op state when first two registers overwritten with 0x00 */
423 cyapa->gen = CYAPA_GEN3;
424 cyapa->state = CYAPA_STATE_OP;
425 } else if (reg_data[REG_BL_STATUS] &
426 (BL_STATUS_RUNNING | BL_STATUS_BUSY)) {
427 cyapa->gen = CYAPA_GEN3;
428 cyapa->state = CYAPA_STATE_BL_BUSY;
431 if (cyapa->gen == CYAPA_GEN3 && (cyapa->state == CYAPA_STATE_OP ||
432 cyapa->state == CYAPA_STATE_BL_IDLE ||
433 cyapa->state == CYAPA_STATE_BL_ACTIVE ||
434 cyapa->state == CYAPA_STATE_BL_BUSY))
441 * Enter bootloader by soft resetting the device.
443 * If device is already in the bootloader, the function just returns.
444 * Otherwise, reset the device; after reset, device enters bootloader idle
449 * -EAGAIN device was reset, but is not now in bootloader idle state
450 * < 0 if the device never responds within the timeout
452 static int cyapa_gen3_bl_enter(struct cyapa *cyapa)
457 error = cyapa_poll_state(cyapa, 500);
460 if (cyapa->state == CYAPA_STATE_BL_IDLE) {
461 /* Already in BL_IDLE. Skipping reset. */
465 if (cyapa->state != CYAPA_STATE_OP)
468 cyapa->operational = false;
469 cyapa->state = CYAPA_STATE_NO_DEVICE;
470 error = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, 0x01);
474 usleep_range(25000, 50000);
475 waiting_time = 2000; /* For some shipset, max waiting time is 1~2s. */
477 error = cyapa_poll_state(cyapa, 500);
479 if (error == -ETIMEDOUT) {
486 if ((cyapa->state == CYAPA_STATE_BL_IDLE) &&
487 !(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
492 } while (waiting_time > 0);
494 if ((cyapa->state != CYAPA_STATE_BL_IDLE) ||
495 (cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
501 static int cyapa_gen3_bl_activate(struct cyapa *cyapa)
505 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_activate),
510 /* Wait for bootloader to activate; takes between 2 and 12 seconds */
512 error = cyapa_poll_state(cyapa, 11000);
515 if (cyapa->state != CYAPA_STATE_BL_ACTIVE)
521 static int cyapa_gen3_bl_deactivate(struct cyapa *cyapa)
525 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
530 /* Wait for bootloader to switch to idle state; should take < 100ms */
532 error = cyapa_poll_state(cyapa, 500);
535 if (cyapa->state != CYAPA_STATE_BL_IDLE)
543 * Send bl_exit command, then wait 50 - 100 ms to let device transition to
544 * operational mode. If this is the first time the device's firmware is
545 * running, it can take up to 2 seconds to calibrate its sensors. So, poll
546 * the device's new state for up to 2 seconds.
549 * -EIO failure while reading from device
550 * -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
551 * 0 device is supported and in operational mode
553 static int cyapa_gen3_bl_exit(struct cyapa *cyapa)
557 error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
562 * Wait for bootloader to exit, and operation mode to start.
563 * Normally, this takes at least 50 ms.
565 usleep_range(50000, 100000);
567 * In addition, when a device boots for the first time after being
568 * updated to new firmware, it must first calibrate its sensors, which
569 * can take up to an additional 2 seconds. If the device power is
570 * running low, this may take even longer.
572 error = cyapa_poll_state(cyapa, 4000);
575 if (cyapa->state != CYAPA_STATE_OP)
581 static u16 cyapa_gen3_csum(const u8 *buf, size_t count)
586 for (i = 0; i < count; i++)
593 * Verify the integrity of a CYAPA firmware image file.
595 * The firmware image file is 30848 bytes, composed of 482 64-byte blocks.
597 * The first 2 blocks are the firmware header.
598 * The next 480 blocks are the firmware image.
600 * The first two bytes of the header hold the header checksum, computed by
601 * summing the other 126 bytes of the header.
602 * The last two bytes of the header hold the firmware image checksum, computed
603 * by summing the 30720 bytes of the image modulo 0xffff.
605 * Both checksums are stored little-endian.
607 static int cyapa_gen3_check_fw(struct cyapa *cyapa, const struct firmware *fw)
609 struct device *dev = &cyapa->client->dev;
613 /* Firmware must match exact 30848 bytes = 482 64-byte blocks. */
614 if (fw->size != CYAPA_FW_SIZE) {
615 dev_err(dev, "invalid firmware size = %zu, expected %u.\n",
616 fw->size, CYAPA_FW_SIZE);
620 /* Verify header block */
621 csum_expected = (fw->data[0] << 8) | fw->data[1];
622 csum = cyapa_gen3_csum(&fw->data[2], CYAPA_FW_HDR_SIZE - 2);
623 if (csum != csum_expected) {
624 dev_err(dev, "%s %04x, expected: %04x\n",
625 "invalid firmware header checksum = ",
626 csum, csum_expected);
630 /* Verify firmware image */
631 csum_expected = (fw->data[CYAPA_FW_HDR_SIZE - 2] << 8) |
632 fw->data[CYAPA_FW_HDR_SIZE - 1];
633 csum = cyapa_gen3_csum(&fw->data[CYAPA_FW_HDR_SIZE],
635 if (csum != csum_expected) {
636 dev_err(dev, "%s %04x, expected: %04x\n",
637 "invalid firmware header checksum = ",
638 csum, csum_expected);
645 * Write a |len| byte long buffer |buf| to the device, by chopping it up into a
646 * sequence of smaller |CYAPA_CMD_LEN|-length write commands.
648 * The data bytes for a write command are prepended with the 1-byte offset
649 * of the data relative to the start of |buf|.
651 static int cyapa_gen3_write_buffer(struct cyapa *cyapa,
652 const u8 *buf, size_t len)
656 unsigned char cmd[CYAPA_CMD_LEN + 1];
659 for (i = 0; i < len; i += CYAPA_CMD_LEN) {
660 const u8 *payload = &buf[i];
662 cmd_len = (len - i >= CYAPA_CMD_LEN) ? CYAPA_CMD_LEN : len - i;
664 memcpy(&cmd[1], payload, cmd_len);
666 error = cyapa_i2c_reg_write_block(cyapa, 0, cmd_len + 1, cmd);
674 * A firmware block write command writes 64 bytes of data to a single flash
675 * page in the device. The 78-byte block write command has the format:
676 * <0xff> <CMD> <Key> <Start> <Data> <Data-Checksum> <CMD Checksum>
678 * <0xff> - every command starts with 0xff
679 * <CMD> - the write command value is 0x39
680 * <Key> - write commands include an 8-byte key: { 00 01 02 03 04 05 06 07 }
681 * <Block> - Memory Block number (address / 64) (16-bit, big-endian)
682 * <Data> - 64 bytes of firmware image data
683 * <Data Checksum> - sum of 64 <Data> bytes, modulo 0xff
684 * <CMD Checksum> - sum of 77 bytes, from 0xff to <Data Checksum>
686 * Each write command is split into 5 i2c write transactions of up to 16 bytes.
687 * Each transaction starts with an i2c register offset: (00, 10, 20, 30, 40).
689 static int cyapa_gen3_write_fw_block(struct cyapa *cyapa,
690 u16 block, const u8 *data)
693 struct gen3_write_block_cmd write_block_cmd;
694 u8 status[BL_STATUS_SIZE];
696 u8 bl_status, bl_error;
698 /* Set write command and security key bytes. */
699 write_block_cmd.checksum_seed = GEN3_BL_CMD_CHECKSUM_SEED;
700 write_block_cmd.cmd_code = GEN3_BL_CMD_WRITE_BLOCK;
701 memcpy(write_block_cmd.key, security_key, sizeof(security_key));
702 put_unaligned_be16(block, &write_block_cmd.block_num);
703 memcpy(write_block_cmd.block_data, data, CYAPA_FW_BLOCK_SIZE);
704 write_block_cmd.block_checksum = cyapa_gen3_csum(
705 write_block_cmd.block_data, CYAPA_FW_BLOCK_SIZE);
706 write_block_cmd.cmd_checksum = cyapa_gen3_csum((u8 *)&write_block_cmd,
707 sizeof(write_block_cmd) - 1);
709 ret = cyapa_gen3_write_buffer(cyapa, (u8 *)&write_block_cmd,
710 sizeof(write_block_cmd));
714 /* Wait for write to finish */
715 tries = 11; /* Programming for one block can take about 100ms. */
717 usleep_range(10000, 20000);
719 /* Check block write command result status. */
720 ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET,
721 BL_STATUS_SIZE, status);
722 if (ret != BL_STATUS_SIZE)
723 return (ret < 0) ? ret : -EIO;
724 } while ((status[REG_BL_STATUS] & BL_STATUS_BUSY) && --tries);
726 /* Ignore WATCHDOG bit and reserved bits. */
727 bl_status = status[REG_BL_STATUS] & ~BL_STATUS_REV_MASK;
728 bl_error = status[REG_BL_ERROR] & ~BL_ERROR_RESERVED;
730 if (bl_status & BL_STATUS_BUSY)
732 else if (bl_status != BL_STATUS_RUNNING ||
733 bl_error != BL_ERROR_BOOTLOADING)
741 static int cyapa_gen3_write_blocks(struct cyapa *cyapa,
742 size_t start_block, size_t block_count,
743 const u8 *image_data)
748 for (i = 0; i < block_count; i++) {
749 size_t block = start_block + i;
750 size_t addr = i * CYAPA_FW_BLOCK_SIZE;
751 const u8 *data = &image_data[addr];
753 error = cyapa_gen3_write_fw_block(cyapa, block, data);
760 static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
761 const struct firmware *fw)
763 struct device *dev = &cyapa->client->dev;
766 /* First write data, starting at byte 128 of fw->data */
767 error = cyapa_gen3_write_blocks(cyapa,
768 CYAPA_FW_DATA_BLOCK_START, CYAPA_FW_DATA_BLOCK_COUNT,
769 &fw->data[CYAPA_FW_HDR_BLOCK_COUNT * CYAPA_FW_BLOCK_SIZE]);
771 dev_err(dev, "FW update aborted, write image: %d\n", error);
775 /* Then write checksum */
776 error = cyapa_gen3_write_blocks(cyapa,
777 CYAPA_FW_HDR_BLOCK_START, CYAPA_FW_HDR_BLOCK_COUNT,
780 dev_err(dev, "FW update aborted, write checksum: %d\n", error);
787 static ssize_t cyapa_gen3_do_calibrate(struct device *dev,
788 struct device_attribute *attr,
789 const char *buf, size_t count)
791 struct cyapa *cyapa = dev_get_drvdata(dev);
795 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
797 dev_err(dev, "Error reading dev status: %d\n", ret);
800 if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
801 dev_warn(dev, "Trackpad device is busy, device state: 0x%02x\n",
807 ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
808 OP_RECALIBRATION_MASK);
810 dev_err(dev, "Failed to send calibrate command: %d\n",
815 tries = 20; /* max recalibration timeout 2s. */
818 * For this recalibration, the max time will not exceed 2s.
819 * The average time is approximately 500 - 700 ms, and we
820 * will check the status every 100 - 200ms.
822 usleep_range(100000, 200000);
824 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
826 dev_err(dev, "Error reading dev status: %d\n",
830 if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
835 dev_err(dev, "Failed to calibrate. Timeout.\n");
839 dev_dbg(dev, "Calibration successful.\n");
842 return ret < 0 ? ret : count;
845 static ssize_t cyapa_gen3_show_baseline(struct device *dev,
846 struct device_attribute *attr, char *buf)
848 struct cyapa *cyapa = dev_get_drvdata(dev);
849 int max_baseline, min_baseline;
853 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
855 dev_err(dev, "Error reading dev status. err = %d\n", ret);
858 if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
859 dev_warn(dev, "Trackpad device is busy. device state = 0x%x\n",
865 ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
866 OP_REPORT_BASELINE_MASK);
868 dev_err(dev, "Failed to send report baseline command. %d\n",
873 tries = 3; /* Try for 30 to 60 ms */
875 usleep_range(10000, 20000);
877 ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
879 dev_err(dev, "Error reading dev status. err = %d\n",
883 if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
888 dev_err(dev, "Device timed out going to Normal state.\n");
893 ret = cyapa_read_byte(cyapa, CYAPA_CMD_MAX_BASELINE);
895 dev_err(dev, "Failed to read max baseline. err = %d\n", ret);
900 ret = cyapa_read_byte(cyapa, CYAPA_CMD_MIN_BASELINE);
902 dev_err(dev, "Failed to read min baseline. err = %d\n", ret);
907 dev_dbg(dev, "Baseline report successful. Max: %d Min: %d\n",
908 max_baseline, min_baseline);
909 ret = scnprintf(buf, PAGE_SIZE, "%d %d\n", max_baseline, min_baseline);
916 * cyapa_get_wait_time_for_pwr_cmd
918 * Compute the amount of time we need to wait after updating the touchpad
919 * power mode. The touchpad needs to consume the incoming power mode set
920 * command at the current clock rate.
923 static u16 cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode)
926 case PWR_MODE_FULL_ACTIVE: return 20;
927 case PWR_MODE_BTN_ONLY: return 20;
928 case PWR_MODE_OFF: return 20;
929 default: return cyapa_pwr_cmd_to_sleep_time(pwr_mode) + 50;
934 * Set device power mode
936 * Write to the field to configure power state. Power states include :
937 * Full : Max scans and report rate.
938 * Idle : Report rate set by user specified time.
939 * ButtonOnly : No scans for fingers. When the button is triggered,
940 * a slave interrupt is asserted to notify host to wake up.
941 * Off : Only awake for i2c commands from host. No function for button
944 * The power_mode command should conform to the following :
946 * Idle : Configurable from 20 to 1000ms. See note below for
947 * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
951 * Device power mode can only be set when device is in operational mode.
953 static int cyapa_gen3_set_power_mode(struct cyapa *cyapa, u8 power_mode,
954 u16 always_unused, enum cyapa_pm_stage pm_stage)
956 struct input_dev *input = cyapa->input;
963 if (cyapa->state != CYAPA_STATE_OP)
966 tries = SET_POWER_MODE_TRIES;
968 ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
971 usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
977 * Return early if the power mode to set is the same as the current
980 if ((ret & PWR_MODE_MASK) == power_mode)
983 sleep_time = (int)cyapa_get_wait_time_for_pwr_cmd(ret & PWR_MODE_MASK);
985 power &= ~PWR_MODE_MASK;
986 power |= power_mode & PWR_MODE_MASK;
987 tries = SET_POWER_MODE_TRIES;
989 ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
992 usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
996 * Wait for the newly set power command to go in at the previous
997 * clock speed (scanrate) used by the touchpad firmware. Not
998 * doing so before issuing the next command may result in errors
999 * depending on the command's content.
1001 if (cyapa->operational && input && input->users &&
1002 (pm_stage == CYAPA_PM_RUNTIME_SUSPEND ||
1003 pm_stage == CYAPA_PM_RUNTIME_RESUME)) {
1004 /* Try to polling in 120Hz, read may fail, just ignore it. */
1005 interval = 1000 / 120;
1006 while (sleep_time > 0) {
1007 if (sleep_time > interval)
1011 sleep_time -= interval;
1012 cyapa_gen3_try_poll_handler(cyapa);
1021 static int cyapa_gen3_set_proximity(struct cyapa *cyapa, bool enable)
1026 static int cyapa_gen3_get_query_data(struct cyapa *cyapa)
1028 u8 query_data[QUERY_DATA_SIZE];
1031 if (cyapa->state != CYAPA_STATE_OP)
1034 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
1035 if (ret != QUERY_DATA_SIZE)
1036 return (ret < 0) ? ret : -EIO;
1038 memcpy(&cyapa->product_id[0], &query_data[0], 5);
1039 cyapa->product_id[5] = '-';
1040 memcpy(&cyapa->product_id[6], &query_data[5], 6);
1041 cyapa->product_id[12] = '-';
1042 memcpy(&cyapa->product_id[13], &query_data[11], 2);
1043 cyapa->product_id[15] = '\0';
1045 cyapa->fw_maj_ver = query_data[15];
1046 cyapa->fw_min_ver = query_data[16];
1048 cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
1050 cyapa->gen = query_data[20] & 0x0f;
1052 cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
1053 cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
1055 cyapa->physical_size_x =
1056 ((query_data[24] & 0xf0) << 4) | query_data[25];
1057 cyapa->physical_size_y =
1058 ((query_data[24] & 0x0f) << 8) | query_data[26];
1065 static int cyapa_gen3_bl_query_data(struct cyapa *cyapa)
1067 u8 bl_data[CYAPA_CMD_LEN];
1070 ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data);
1071 if (ret != CYAPA_CMD_LEN)
1072 return (ret < 0) ? ret : -EIO;
1075 * This value will be updated again when entered application mode.
1076 * If TP failed to enter application mode, this fw version values
1077 * can be used as a reference.
1078 * This firmware version valid when fw image checksum is valid.
1080 if (bl_data[REG_BL_STATUS] ==
1081 (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) {
1082 cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET];
1083 cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET];
1090 * Check if device is operational.
1092 * An operational device is responding, has exited bootloader, and has
1093 * firmware supported by this driver.
1096 * -EBUSY no device or in bootloader
1097 * -EIO failure while reading from device
1098 * -EAGAIN device is still in bootloader
1099 * if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
1100 * -EINVAL device is in operational mode, but not supported by this driver
1101 * 0 device is supported
1103 static int cyapa_gen3_do_operational_check(struct cyapa *cyapa)
1105 struct device *dev = &cyapa->client->dev;
1108 switch (cyapa->state) {
1109 case CYAPA_STATE_BL_ACTIVE:
1110 error = cyapa_gen3_bl_deactivate(cyapa);
1112 dev_err(dev, "failed to bl_deactivate: %d\n", error);
1116 /* Fallthrough state */
1117 case CYAPA_STATE_BL_IDLE:
1118 /* Try to get firmware version in bootloader mode. */
1119 cyapa_gen3_bl_query_data(cyapa);
1121 error = cyapa_gen3_bl_exit(cyapa);
1123 dev_err(dev, "failed to bl_exit: %d\n", error);
1127 /* Fallthrough state */
1128 case CYAPA_STATE_OP:
1130 * Reading query data before going back to the full mode
1131 * may cause problems, so we set the power mode first here.
1133 error = cyapa_gen3_set_power_mode(cyapa,
1134 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE);
1136 dev_err(dev, "%s: set full power mode failed: %d\n",
1138 error = cyapa_gen3_get_query_data(cyapa);
1142 /* Only support firmware protocol gen3 */
1143 if (cyapa->gen != CYAPA_GEN3) {
1144 dev_err(dev, "unsupported protocol version (%d)",
1149 /* Only support product ID starting with CYTRA */
1150 if (memcmp(cyapa->product_id, product_id,
1151 strlen(product_id)) != 0) {
1152 dev_err(dev, "unsupported product ID (%s)\n",
1166 * Return false, do not continue process
1167 * Return true, continue process.
1169 static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa)
1171 /* Not gen3 irq command response, skip for continue. */
1172 if (cyapa->gen != CYAPA_GEN3)
1175 if (cyapa->operational)
1179 * Driver in detecting or other interface function processing,
1180 * so, stop cyapa_gen3_irq_handler to continue process to
1181 * avoid unwanted to error detecting and processing.
1183 * And also, avoid the periodically asserted interrupts to be processed
1184 * as touch inputs when gen3 failed to launch into application mode,
1185 * which will cause gen3 stays in bootloader mode.
1190 static int cyapa_gen3_event_process(struct cyapa *cyapa,
1191 struct cyapa_reg_data *data)
1193 struct input_dev *input = cyapa->input;
1197 num_fingers = (data->finger_btn >> 4) & 0x0f;
1198 for (i = 0; i < num_fingers; i++) {
1199 const struct cyapa_touch *touch = &data->touches[i];
1200 /* Note: touch->id range is 1 to 15; slots are 0 to 14. */
1201 int slot = touch->id - 1;
1203 input_mt_slot(input, slot);
1204 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
1205 input_report_abs(input, ABS_MT_POSITION_X,
1206 ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
1207 input_report_abs(input, ABS_MT_POSITION_Y,
1208 ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
1209 input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
1212 input_mt_sync_frame(input);
1214 if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
1215 input_report_key(input, BTN_LEFT,
1216 !!(data->finger_btn & OP_DATA_LEFT_BTN));
1217 if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
1218 input_report_key(input, BTN_MIDDLE,
1219 !!(data->finger_btn & OP_DATA_MIDDLE_BTN));
1220 if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
1221 input_report_key(input, BTN_RIGHT,
1222 !!(data->finger_btn & OP_DATA_RIGHT_BTN));
1228 static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
1230 struct device *dev = &cyapa->client->dev;
1231 struct cyapa_reg_data data;
1234 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1235 if (ret != sizeof(data)) {
1236 dev_err(dev, "failed to read report data, (%d)\n", ret);
1240 if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1241 (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1242 (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
1243 dev_err(dev, "invalid device state bytes: %02x %02x\n",
1244 data.device_status, data.finger_btn);
1248 return cyapa_gen3_event_process(cyapa, &data);
1252 * This function will be called in the cyapa_gen3_set_power_mode function,
1253 * and it's known that it may failed in some situation after the set power
1254 * mode command was sent. So this function is aimed to avoid the knwon
1255 * and unwanted output I2C and data parse error messages.
1257 static int cyapa_gen3_try_poll_handler(struct cyapa *cyapa)
1259 struct cyapa_reg_data data;
1262 ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1263 if (ret != sizeof(data))
1266 if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1267 (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1268 (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID)
1271 return cyapa_gen3_event_process(cyapa, &data);
1275 static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; }
1276 static int cyapa_gen3_bl_initiate(struct cyapa *cyapa,
1277 const struct firmware *fw) { return 0; }
1278 static int cyapa_gen3_empty_output_data(struct cyapa *cyapa,
1279 u8 *buf, int *len, cb_sort func) { return 0; }
1281 const struct cyapa_dev_ops cyapa_gen3_ops = {
1282 .check_fw = cyapa_gen3_check_fw,
1283 .bl_enter = cyapa_gen3_bl_enter,
1284 .bl_activate = cyapa_gen3_bl_activate,
1285 .update_fw = cyapa_gen3_do_fw_update,
1286 .bl_deactivate = cyapa_gen3_bl_deactivate,
1287 .bl_initiate = cyapa_gen3_bl_initiate,
1289 .show_baseline = cyapa_gen3_show_baseline,
1290 .calibrate_store = cyapa_gen3_do_calibrate,
1292 .initialize = cyapa_gen3_initialize,
1294 .state_parse = cyapa_gen3_state_parse,
1295 .operational_check = cyapa_gen3_do_operational_check,
1297 .irq_handler = cyapa_gen3_irq_handler,
1298 .irq_cmd_handler = cyapa_gen3_irq_cmd_handler,
1299 .sort_empty_output_data = cyapa_gen3_empty_output_data,
1300 .set_power_mode = cyapa_gen3_set_power_mode,
1302 .set_proximity = cyapa_gen3_set_proximity,