drivers/input/mouse/cyapa

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This source file includes following definitions.
cyapa_smbus_read_block
cyapa_read_byte
cyapa_write_byte
cyapa_i2c_reg_read_block
cyapa_i2c_reg_write_block
cyapa_read_block
cyapa_gen3_state_parse
cyapa_gen3_bl_enter
cyapa_gen3_bl_activate
cyapa_gen3_bl_deactivate
cyapa_gen3_bl_exit
cyapa_gen3_csum
cyapa_gen3_check_fw
cyapa_gen3_write_buffer
cyapa_gen3_write_fw_block
cyapa_gen3_write_blocks
cyapa_gen3_do_fw_update
cyapa_gen3_do_calibrate
cyapa_gen3_show_baseline
cyapa_get_wait_time_for_pwr_cmd
cyapa_gen3_set_power_mode
cyapa_gen3_set_proximity
cyapa_gen3_get_query_data
cyapa_gen3_bl_query_data
cyapa_gen3_do_operational_check
cyapa_gen3_irq_cmd_handler
cyapa_gen3_event_process
cyapa_gen3_irq_handler
cyapa_gen3_try_poll_handler
cyapa_gen3_initialize
cyapa_gen3_bl_initiate
cyapa_gen3_empty_output_data
   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  */
 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 
 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 
 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 
 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 
 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 
 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  */
 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  */
 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 
 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 
 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  */
 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 
 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  */
 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  */
 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  */
 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 
 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 
 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 
 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 
 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 
 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  */
 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 && input && input->users &&
 956             (pm_stage == CYAPA_PM_RUNTIME_SUSPEND ||
 957              pm_stage == CYAPA_PM_RUNTIME_RESUME)) {
 958                 /* Try to polling in 120Hz, read may fail, just ignore it. */
 959                 interval = 1000 / 120;
 960                 while (sleep_time > 0) {
 961                         if (sleep_time > interval)
 962                                 msleep(interval);
 963                         else
 964                                 msleep(sleep_time);
 965                         sleep_time -= interval;
 966                         cyapa_gen3_try_poll_handler(cyapa);
 967                 }
 968         } else {
 969                 msleep(sleep_time);
 970         }
 971 
 972         return ret;
 973 }
 974 
 975 static int cyapa_gen3_set_proximity(struct cyapa *cyapa, bool enable)
 976 {
 977         return -EOPNOTSUPP;
 978 }
 979 
 980 static int cyapa_gen3_get_query_data(struct cyapa *cyapa)
 981 {
 982         u8 query_data[QUERY_DATA_SIZE];
 983         int ret;
 984 
 985         if (cyapa->state != CYAPA_STATE_OP)
 986                 return -EBUSY;
 987 
 988         ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
 989         if (ret != QUERY_DATA_SIZE)
 990                 return (ret < 0) ? ret : -EIO;
 991 
 992         memcpy(&cyapa->product_id[0], &query_data[0], 5);
 993         cyapa->product_id[5] = '-';
 994         memcpy(&cyapa->product_id[6], &query_data[5], 6);
 995         cyapa->product_id[12] = '-';
 996         memcpy(&cyapa->product_id[13], &query_data[11], 2);
 997         cyapa->product_id[15] = '\0';
 998 
 999         cyapa->fw_maj_ver = query_data[15];
1000         cyapa->fw_min_ver = query_data[16];
1001 
1002         cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
1003 
1004         cyapa->gen = query_data[20] & 0x0f;
1005 
1006         cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
1007         cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
1008 
1009         cyapa->physical_size_x =
1010                 ((query_data[24] & 0xf0) << 4) | query_data[25];
1011         cyapa->physical_size_y =
1012                 ((query_data[24] & 0x0f) << 8) | query_data[26];
1013 
1014         cyapa->max_z = 255;
1015 
1016         return 0;
1017 }
1018 
1019 static int cyapa_gen3_bl_query_data(struct cyapa *cyapa)
1020 {
1021         u8 bl_data[CYAPA_CMD_LEN];
1022         int ret;
1023 
1024         ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data);
1025         if (ret != CYAPA_CMD_LEN)
1026                 return (ret < 0) ? ret : -EIO;
1027 
1028         /*
1029          * This value will be updated again when entered application mode.
1030          * If TP failed to enter application mode, this fw version values
1031          * can be used as a reference.
1032          * This firmware version valid when fw image checksum is valid.
1033          */
1034         if (bl_data[REG_BL_STATUS] ==
1035                         (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) {
1036                 cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET];
1037                 cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET];
1038         }
1039 
1040         return 0;
1041 }
1042 
1043 /*
1044  * Check if device is operational.
1045  *
1046  * An operational device is responding, has exited bootloader, and has
1047  * firmware supported by this driver.
1048  *
1049  * Returns:
1050  *   -EBUSY  no device or in bootloader
1051  *   -EIO    failure while reading from device
1052  *   -EAGAIN device is still in bootloader
1053  *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
1054  *   -EINVAL device is in operational mode, but not supported by this driver
1055  *   0       device is supported
1056  */
1057 static int cyapa_gen3_do_operational_check(struct cyapa *cyapa)
1058 {
1059         struct device *dev = &cyapa->client->dev;
1060         int error;
1061 
1062         switch (cyapa->state) {
1063         case CYAPA_STATE_BL_ACTIVE:
1064                 error = cyapa_gen3_bl_deactivate(cyapa);
1065                 if (error) {
1066                         dev_err(dev, "failed to bl_deactivate: %d\n", error);
1067                         return error;
1068                 }
1069 
1070         /* Fall through */
1071         case CYAPA_STATE_BL_IDLE:
1072                 /* Try to get firmware version in bootloader mode. */
1073                 cyapa_gen3_bl_query_data(cyapa);
1074 
1075                 error = cyapa_gen3_bl_exit(cyapa);
1076                 if (error) {
1077                         dev_err(dev, "failed to bl_exit: %d\n", error);
1078                         return error;
1079                 }
1080 
1081         /* Fall through */
1082         case CYAPA_STATE_OP:
1083                 /*
1084                  * Reading query data before going back to the full mode
1085                  * may cause problems, so we set the power mode first here.
1086                  */
1087                 error = cyapa_gen3_set_power_mode(cyapa,
1088                                 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE);
1089                 if (error)
1090                         dev_err(dev, "%s: set full power mode failed: %d\n",
1091                                 __func__, error);
1092                 error = cyapa_gen3_get_query_data(cyapa);
1093                 if (error < 0)
1094                         return error;
1095 
1096                 /* Only support firmware protocol gen3 */
1097                 if (cyapa->gen != CYAPA_GEN3) {
1098                         dev_err(dev, "unsupported protocol version (%d)",
1099                                 cyapa->gen);
1100                         return -EINVAL;
1101                 }
1102 
1103                 /* Only support product ID starting with CYTRA */
1104                 if (memcmp(cyapa->product_id, product_id,
1105                                 strlen(product_id)) != 0) {
1106                         dev_err(dev, "unsupported product ID (%s)\n",
1107                                 cyapa->product_id);
1108                         return -EINVAL;
1109                 }
1110 
1111                 return 0;
1112 
1113         default:
1114                 return -EIO;
1115         }
1116         return 0;
1117 }
1118 
1119 /*
1120  * Return false, do not continue process
1121  * Return true, continue process.
1122  */
1123 static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa)
1124 {
1125         /* Not gen3 irq command response, skip for continue. */
1126         if (cyapa->gen != CYAPA_GEN3)
1127                 return true;
1128 
1129         if (cyapa->operational)
1130                 return true;
1131 
1132         /*
1133          * Driver in detecting or other interface function processing,
1134          * so, stop cyapa_gen3_irq_handler to continue process to
1135          * avoid unwanted to error detecting and processing.
1136          *
1137          * And also, avoid the periodically asserted interrupts to be processed
1138          * as touch inputs when gen3 failed to launch into application mode,
1139          * which will cause gen3 stays in bootloader mode.
1140          */
1141         return false;
1142 }
1143 
1144 static int cyapa_gen3_event_process(struct cyapa *cyapa,
1145                                     struct cyapa_reg_data *data)
1146 {
1147         struct input_dev *input = cyapa->input;
1148         int num_fingers;
1149         int i;
1150 
1151         num_fingers = (data->finger_btn >> 4) & 0x0f;
1152         for (i = 0; i < num_fingers; i++) {
1153                 const struct cyapa_touch *touch = &data->touches[i];
1154                 /* Note: touch->id range is 1 to 15; slots are 0 to 14. */
1155                 int slot = touch->id - 1;
1156 
1157                 input_mt_slot(input, slot);
1158                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
1159                 input_report_abs(input, ABS_MT_POSITION_X,
1160                                  ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
1161                 input_report_abs(input, ABS_MT_POSITION_Y,
1162                                  ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
1163                 input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
1164         }
1165 
1166         input_mt_sync_frame(input);
1167 
1168         if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
1169                 input_report_key(input, BTN_LEFT,
1170                                  !!(data->finger_btn & OP_DATA_LEFT_BTN));
1171         if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
1172                 input_report_key(input, BTN_MIDDLE,
1173                                  !!(data->finger_btn & OP_DATA_MIDDLE_BTN));
1174         if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
1175                 input_report_key(input, BTN_RIGHT,
1176                                  !!(data->finger_btn & OP_DATA_RIGHT_BTN));
1177         input_sync(input);
1178 
1179         return 0;
1180 }
1181 
1182 static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
1183 {
1184         struct device *dev = &cyapa->client->dev;
1185         struct cyapa_reg_data data;
1186         int ret;
1187 
1188         ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1189         if (ret != sizeof(data)) {
1190                 dev_err(dev, "failed to read report data, (%d)\n", ret);
1191                 return -EINVAL;
1192         }
1193 
1194         if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1195             (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1196             (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
1197                 dev_err(dev, "invalid device state bytes: %02x %02x\n",
1198                         data.device_status, data.finger_btn);
1199                 return -EINVAL;
1200         }
1201 
1202         return cyapa_gen3_event_process(cyapa, &data);
1203 }
1204 
1205 /*
1206  * This function will be called in the cyapa_gen3_set_power_mode function,
1207  * and it's known that it may failed in some situation after the set power
1208  * mode command was sent. So this function is aimed to avoid the knwon
1209  * and unwanted output I2C and data parse error messages.
1210  */
1211 static int cyapa_gen3_try_poll_handler(struct cyapa *cyapa)
1212 {
1213         struct cyapa_reg_data data;
1214         int ret;
1215 
1216         ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
1217         if (ret != sizeof(data))
1218                 return -EINVAL;
1219 
1220         if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
1221             (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
1222             (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID)
1223                 return -EINVAL;
1224 
1225         return cyapa_gen3_event_process(cyapa, &data);
1226 
1227 }
1228 
1229 static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; }
1230 static int cyapa_gen3_bl_initiate(struct cyapa *cyapa,
1231                 const struct firmware *fw) { return 0; }
1232 static int cyapa_gen3_empty_output_data(struct cyapa *cyapa,
1233                 u8 *buf, int *len, cb_sort func) { return 0; }
1234 
1235 const struct cyapa_dev_ops cyapa_gen3_ops = {
1236         .check_fw = cyapa_gen3_check_fw,
1237         .bl_enter = cyapa_gen3_bl_enter,
1238         .bl_activate = cyapa_gen3_bl_activate,
1239         .update_fw = cyapa_gen3_do_fw_update,
1240         .bl_deactivate = cyapa_gen3_bl_deactivate,
1241         .bl_initiate = cyapa_gen3_bl_initiate,
1242 
1243         .show_baseline = cyapa_gen3_show_baseline,
1244         .calibrate_store = cyapa_gen3_do_calibrate,
1245 
1246         .initialize = cyapa_gen3_initialize,
1247 
1248         .state_parse = cyapa_gen3_state_parse,
1249         .operational_check = cyapa_gen3_do_operational_check,
1250 
1251         .irq_handler = cyapa_gen3_irq_handler,
1252         .irq_cmd_handler = cyapa_gen3_irq_cmd_handler,
1253         .sort_empty_output_data = cyapa_gen3_empty_output_data,
1254         .set_power_mode = cyapa_gen3_set_power_mode,
1255 
1256         .set_proximity = cyapa_gen3_set_proximity,
1257 };
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/input/mouse/cyapa_gen3.c

DEFINITIONS
