drivers/input/mouse/cyapa.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) 2011-2015 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/interrupt.h>
  22 #include <linux/module.h>
  23 #include <linux/mutex.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/slab.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/acpi.h>
  29 #include <linux/of.h>
  30 #include "cyapa.h"
  31
  32
  33 #define CYAPA_ADAPTER_FUNC_NONE   0
  34 #define CYAPA_ADAPTER_FUNC_I2C    1
  35 #define CYAPA_ADAPTER_FUNC_SMBUS  2
  36 #define CYAPA_ADAPTER_FUNC_BOTH   3
  37
  38 #define CYAPA_FW_NAME           "cyapa.bin"
  39
  40 const char product_id[] = "CYTRA";
  41
  42 static int cyapa_reinitialize(struct cyapa *cyapa);
  43
  44 bool cyapa_is_pip_bl_mode(struct cyapa *cyapa)
  45 {
  46         if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_BL)
  47                 return true;
  48
  49         if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL)
  50                 return true;
  51
  52         return false;
  53 }
  54
  55 bool cyapa_is_pip_app_mode(struct cyapa *cyapa)
  56 {
  57         if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_APP)
  58                 return true;
  59
  60         if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP)
  61                 return true;
  62
  63         return false;
  64 }
  65
  66 static bool cyapa_is_bootloader_mode(struct cyapa *cyapa)
  67 {
  68         if (cyapa_is_pip_bl_mode(cyapa))
  69                 return true;
  70
  71         if (cyapa->gen == CYAPA_GEN3 &&
  72                 cyapa->state >= CYAPA_STATE_BL_BUSY &&
  73                 cyapa->state <= CYAPA_STATE_BL_ACTIVE)
  74                 return true;
  75
  76         return false;
  77 }
  78
  79 static inline bool cyapa_is_operational_mode(struct cyapa *cyapa)
  80 {
  81         if (cyapa_is_pip_app_mode(cyapa))
  82                 return true;
  83
  84         if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP)
  85                 return true;
  86
  87         return false;
  88 }
  89
  90 /* Returns 0 on success, else negative errno on failure. */
  91 static ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len,
  92                                         u8 *values)
  93 {
  94         struct i2c_client *client = cyapa->client;
  95         struct i2c_msg msgs[] = {
  96                 {
  97                         .addr = client->addr,
  98                         .flags = 0,
  99                         .len = 1,
 100                         .buf = &reg,
 101                 },
 102                 {
 103                         .addr = client->addr,
 104                         .flags = I2C_M_RD,
 105                         .len = len,
 106                         .buf = values,
 107                 },
 108         };
 109         int ret;
 110
 111         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 112
 113         if (ret != ARRAY_SIZE(msgs))
 114                 return ret < 0 ? ret : -EIO;
 115
 116         return 0;
 117 }
 118
 119 /**
 120  * cyapa_i2c_write - Execute i2c block data write operation
 121  * @cyapa: Handle to this driver
 122  * @ret: Offset of the data to written in the register map
 123  * @len: number of bytes to write
 124  * @values: Data to be written
 125  *
 126  * Return negative errno code on error; return zero when success.
 127  */
 128 static int cyapa_i2c_write(struct cyapa *cyapa, u8 reg,
 129                                          size_t len, const void *values)
 130 {
 131         struct i2c_client *client = cyapa->client;
 132         char buf[32];
 133         int ret;
 134
 135         if (len > sizeof(buf) - 1)
 136                 return -ENOMEM;
 137
 138         buf[0] = reg;
 139         memcpy(&buf[1], values, len);
 140
 141         ret = i2c_master_send(client, buf, len + 1);
 142         if (ret != len + 1)
 143                 return ret < 0 ? ret : -EIO;
 144
 145         return 0;
 146 }
 147
 148 static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
 149 {
 150         u8 ret = CYAPA_ADAPTER_FUNC_NONE;
 151
 152         if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 153                 ret |= CYAPA_ADAPTER_FUNC_I2C;
 154         if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 155                                      I2C_FUNC_SMBUS_BLOCK_DATA |
 156                                      I2C_FUNC_SMBUS_I2C_BLOCK))
 157                 ret |= CYAPA_ADAPTER_FUNC_SMBUS;
 158         return ret;
 159 }
 160
 161 /*
 162  * Query device for its current operating state.
 163  */
 164 static int cyapa_get_state(struct cyapa *cyapa)
 165 {
 166         u8 status[BL_STATUS_SIZE];
 167         u8 cmd[32];
 168         /* The i2c address of gen4 and gen5 trackpad device must be even. */
 169         bool even_addr = ((cyapa->client->addr & 0x0001) == 0);
 170         bool smbus = false;
 171         int retries = 2;
 172         int error;
 173
 174         cyapa->state = CYAPA_STATE_NO_DEVICE;
 175
 176         /*
 177          * Get trackpad status by reading 3 registers starting from 0.
 178          * If the device is in the bootloader, this will be BL_HEAD.
 179          * If the device is in operation mode, this will be the DATA regs.
 180          *
 181          */
 182         error = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
 183                                        status);
 184
 185         /*
 186          * On smbus systems in OP mode, the i2c_reg_read will fail with
 187          * -ETIMEDOUT.  In this case, try again using the smbus equivalent
 188          * command.  This should return a BL_HEAD indicating CYAPA_STATE_OP.
 189          */
 190         if (cyapa->smbus && (error == -ETIMEDOUT || error == -ENXIO)) {
 191                 if (!even_addr)
 192                         error = cyapa_read_block(cyapa,
 193                                         CYAPA_CMD_BL_STATUS, status);
 194                 smbus = true;
 195         }
 196
 197         if (error != BL_STATUS_SIZE)
 198                 goto error;
 199
 200         /*
 201          * Detect trackpad protocol based on characteristic registers and bits.
 202          */
 203         do {
 204                 cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS];
 205                 cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS];
 206                 cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR];
 207
 208                 if (cyapa->gen == CYAPA_GEN_UNKNOWN ||
 209                                 cyapa->gen == CYAPA_GEN3) {
 210                         error = cyapa_gen3_ops.state_parse(cyapa,
 211                                         status, BL_STATUS_SIZE);
 212                         if (!error)
 213                                 goto out_detected;
 214                 }
 215                 if (cyapa->gen == CYAPA_GEN_UNKNOWN ||
 216                                 cyapa->gen == CYAPA_GEN6 ||
 217                                 cyapa->gen == CYAPA_GEN5) {
 218                         error = cyapa_pip_state_parse(cyapa,
 219                                         status, BL_STATUS_SIZE);
 220                         if (!error)
 221                                 goto out_detected;
 222                 }
 223                 /* For old Gen5 trackpads detecting. */
 224                 if ((cyapa->gen == CYAPA_GEN_UNKNOWN ||
 225                                 cyapa->gen == CYAPA_GEN5) &&
 226                         !smbus && even_addr) {
 227                         error = cyapa_gen5_ops.state_parse(cyapa,
 228                                         status, BL_STATUS_SIZE);
 229                         if (!error)
 230                                 goto out_detected;
 231                 }
 232
 233                 /*
 234                  * Write 0x00 0x00 to trackpad device to force update its
 235                  * status, then redo the detection again.
 236                  */
 237                 if (!smbus) {
 238                         cmd[0] = 0x00;
 239                         cmd[1] = 0x00;
 240                         error = cyapa_i2c_write(cyapa, 0, 2, cmd);
 241                         if (error)
 242                                 goto error;
 243
 244                         msleep(50);
 245
 246                         error = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET,
 247                                         BL_STATUS_SIZE, status);
 248                         if (error)
 249                                 goto error;
 250                 }
 251         } while (--retries > 0 && !smbus);
 252
 253         goto error;
 254
 255 out_detected:
 256         if (cyapa->state <= CYAPA_STATE_BL_BUSY)
 257                 return -EAGAIN;
 258         return 0;
 259
 260 error:
 261         return (error < 0) ? error : -EAGAIN;
 262 }
 263
 264 /*
 265  * Poll device for its status in a loop, waiting up to timeout for a response.
 266  *
 267  * When the device switches state, it usually takes ~300 ms.
 268  * However, when running a new firmware image, the device must calibrate its
 269  * sensors, which can take as long as 2 seconds.
 270  *
 271  * Note: The timeout has granularity of the polling rate, which is 100 ms.
 272  *
 273  * Returns:
 274  *   0 when the device eventually responds with a valid non-busy state.
 275  *   -ETIMEDOUT if device never responds (too many -EAGAIN)
 276  *   -EAGAIN    if bootload is busy, or unknown state.
 277  *   < 0        other errors
 278  */
 279 int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
 280 {
 281         int error;
 282         int tries = timeout / 100;
 283
 284         do {
 285                 error = cyapa_get_state(cyapa);
 286                 if (!error && cyapa->state > CYAPA_STATE_BL_BUSY)
 287                         return 0;
 288
 289                 msleep(100);
 290         } while (tries--);
 291
 292         return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error;
 293 }
 294
 295 /*
 296  * Check if device is operational.
 297  *
 298  * An operational device is responding, has exited bootloader, and has
 299  * firmware supported by this driver.
 300  *
 301  * Returns:
 302  *   -ENODEV no device
 303  *   -EBUSY  no device or in bootloader
 304  *   -EIO    failure while reading from device
 305  *   -ETIMEDOUT timeout failure for bus idle or bus no response
 306  *   -EAGAIN device is still in bootloader
 307  *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
 308  *   -EINVAL device is in operational mode, but not supported by this driver
 309  *   0       device is supported
 310  */
 311 static int cyapa_check_is_operational(struct cyapa *cyapa)
 312 {
 313         int error;
 314
 315         error = cyapa_poll_state(cyapa, 4000);
 316         if (error)
 317                 return error;
 318
 319         switch (cyapa->gen) {
 320         case CYAPA_GEN6:
 321                 cyapa->ops = &cyapa_gen6_ops;
 322                 break;
 323         case CYAPA_GEN5:
 324                 cyapa->ops = &cyapa_gen5_ops;
 325                 break;
 326         case CYAPA_GEN3:
 327                 cyapa->ops = &cyapa_gen3_ops;
 328                 break;
 329         default:
 330                 return -ENODEV;
 331         }
 332
 333         error = cyapa->ops->operational_check(cyapa);
 334         if (!error && cyapa_is_operational_mode(cyapa))
 335                 cyapa->operational = true;
 336         else
 337                 cyapa->operational = false;
 338
 339         return error;
 340 }
 341
 342
 343 /*
 344  * Returns 0 on device detected, negative errno on no device detected.
 345  * And when the device is detected and operational, it will be reset to
 346  * full power active mode automatically.
 347  */
 348 static int cyapa_detect(struct cyapa *cyapa)
 349 {
 350         struct device *dev = &cyapa->client->dev;
 351         int error;
 352
 353         error = cyapa_check_is_operational(cyapa);
 354         if (error) {
 355                 if (error != -ETIMEDOUT && error != -ENODEV &&
 356                         cyapa_is_bootloader_mode(cyapa)) {
 357                         dev_warn(dev, "device detected but not operational\n");
 358                         return 0;
 359                 }
 360
 361                 dev_err(dev, "no device detected: %d\n", error);
 362                 return error;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int cyapa_open(struct input_dev *input)
 369 {
 370         struct cyapa *cyapa = input_get_drvdata(input);
 371         struct i2c_client *client = cyapa->client;
 372         struct device *dev = &client->dev;
 373         int error;
 374
 375         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 376         if (error)
 377                 return error;
 378
 379         if (cyapa->operational) {
 380                 /*
 381                  * though failed to set active power mode,
 382                  * but still may be able to work in lower scan rate
 383                  * when in operational mode.
 384                  */
 385                 error = cyapa->ops->set_power_mode(cyapa,
 386                                 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE);
 387                 if (error) {
 388                         dev_warn(dev, "set active power failed: %d\n", error);
 389                         goto out;
 390                 }
 391         } else {
 392                 error = cyapa_reinitialize(cyapa);
 393                 if (error || !cyapa->operational) {
 394                         error = error ? error : -EAGAIN;
 395                         goto out;
 396                 }
 397         }
 398
 399         enable_irq(client->irq);
 400         if (!pm_runtime_enabled(dev)) {
 401                 pm_runtime_set_active(dev);
 402                 pm_runtime_enable(dev);
 403         }
 404
 405         pm_runtime_get_sync(dev);
 406         pm_runtime_mark_last_busy(dev);
 407         pm_runtime_put_sync_autosuspend(dev);
 408 out:
 409         mutex_unlock(&cyapa->state_sync_lock);
 410         return error;
 411 }
 412
 413 static void cyapa_close(struct input_dev *input)
 414 {
 415         struct cyapa *cyapa = input_get_drvdata(input);
 416         struct i2c_client *client = cyapa->client;
 417         struct device *dev = &cyapa->client->dev;
 418
 419         mutex_lock(&cyapa->state_sync_lock);
 420
 421         disable_irq(client->irq);
 422         if (pm_runtime_enabled(dev))
 423                 pm_runtime_disable(dev);
 424         pm_runtime_set_suspended(dev);
 425
 426         if (cyapa->operational)
 427                 cyapa->ops->set_power_mode(cyapa,
 428                                 PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE);
 429
 430         mutex_unlock(&cyapa->state_sync_lock);
 431 }
 432
 433 static int cyapa_create_input_dev(struct cyapa *cyapa)
 434 {
 435         struct device *dev = &cyapa->client->dev;
 436         struct input_dev *input;
 437         int error;
 438
 439         if (!cyapa->physical_size_x || !cyapa->physical_size_y)
 440                 return -EINVAL;
 441
 442         input = devm_input_allocate_device(dev);
 443         if (!input) {
 444                 dev_err(dev, "failed to allocate memory for input device.\n");
 445                 return -ENOMEM;
 446         }
 447
 448         input->name = CYAPA_NAME;
 449         input->phys = cyapa->phys;
 450         input->id.bustype = BUS_I2C;
 451         input->id.version = 1;
 452         input->id.product = 0;  /* Means any product in eventcomm. */
 453         input->dev.parent = &cyapa->client->dev;
 454
 455         input->open = cyapa_open;
 456         input->close = cyapa_close;
 457
 458         input_set_drvdata(input, cyapa);
 459
 460         __set_bit(EV_ABS, input->evbit);
 461
 462         /* Finger position */
 463         input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
 464                              0);
 465         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
 466                              0);
 467         input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0);
 468         if (cyapa->gen > CYAPA_GEN3) {
 469                 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 470                 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
 471                 /*
 472                  * Orientation is the angle between the vertical axis and
 473                  * the major axis of the contact ellipse.
 474                  * The range is -127 to 127.
 475                  * the positive direction is clockwise form the vertical axis.
 476                  * If the ellipse of contact degenerates into a circle,
 477                  * orientation is reported as 0.
 478                  *
 479                  * Also, for Gen5 trackpad the accurate of this orientation
 480                  * value is value + (-30 ~ 30).
 481                  */
 482                 input_set_abs_params(input, ABS_MT_ORIENTATION,
 483                                 -127, 127, 0, 0);
 484         }
 485         if (cyapa->gen >= CYAPA_GEN5) {
 486                 input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
 487                 input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0);
 488                 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
 489         }
 490
 491         input_abs_set_res(input, ABS_MT_POSITION_X,
 492                           cyapa->max_abs_x / cyapa->physical_size_x);
 493         input_abs_set_res(input, ABS_MT_POSITION_Y,
 494                           cyapa->max_abs_y / cyapa->physical_size_y);
 495
 496         if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
 497                 __set_bit(BTN_LEFT, input->keybit);
 498         if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
 499                 __set_bit(BTN_MIDDLE, input->keybit);
 500         if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
 501                 __set_bit(BTN_RIGHT, input->keybit);
 502
 503         if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
 504                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 505
 506         /* Handle pointer emulation and unused slots in core */
 507         error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
 508                                     INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
 509         if (error) {
 510                 dev_err(dev, "failed to initialize MT slots: %d\n", error);
 511                 return error;
 512         }
 513
 514         /* Register the device in input subsystem */
 515         error = input_register_device(input);
 516         if (error) {
 517                 dev_err(dev, "failed to register input device: %d\n", error);
 518                 return error;
 519         }
 520
 521         cyapa->input = input;
 522         return 0;
 523 }
 524
 525 static void cyapa_enable_irq_for_cmd(struct cyapa *cyapa)
 526 {
 527         struct input_dev *input = cyapa->input;
 528
 529         if (!input || !input->users) {
 530                 /*
 531                  * When input is NULL, TP must be in deep sleep mode.
 532                  * In this mode, later non-power I2C command will always failed
 533                  * if not bring it out of deep sleep mode firstly,
 534                  * so must command TP to active mode here.
 535                  */
 536                 if (!input || cyapa->operational)
 537                         cyapa->ops->set_power_mode(cyapa,
 538                                 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE);
 539                 /* Gen3 always using polling mode for command. */
 540                 if (cyapa->gen >= CYAPA_GEN5)
 541                         enable_irq(cyapa->client->irq);
 542         }
 543 }
 544
 545 static void cyapa_disable_irq_for_cmd(struct cyapa *cyapa)
 546 {
 547         struct input_dev *input = cyapa->input;
 548
 549         if (!input || !input->users) {
 550                 if (cyapa->gen >= CYAPA_GEN5)
 551                         disable_irq(cyapa->client->irq);
 552                 if (!input || cyapa->operational)
 553                         cyapa->ops->set_power_mode(cyapa,
 554                                         PWR_MODE_OFF, 0, CYAPA_PM_ACTIVE);
 555         }
 556 }
 557
 558 /*
 559  * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
 560  *
 561  * These are helper functions that convert to and from integer idle
 562  * times and register settings to write to the PowerMode register.
 563  * The trackpad supports between 20ms to 1000ms scan intervals.
 564  * The time will be increased in increments of 10ms from 20ms to 100ms.
 565  * From 100ms to 1000ms, time will be increased in increments of 20ms.
 566  *
 567  * When Idle_Time < 100, the format to convert Idle_Time to Idle_Command is:
 568  *   Idle_Command = Idle Time / 10;
 569  * When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command is:
 570  *   Idle_Command = Idle Time / 20 + 5;
 571  */
 572 u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time)
 573 {
 574         u16 encoded_time;
 575
 576         sleep_time = clamp_val(sleep_time, 20, 1000);
 577         encoded_time = sleep_time < 100 ? sleep_time / 10 : sleep_time / 20 + 5;
 578         return (encoded_time << 2) & PWR_MODE_MASK;
 579 }
 580
 581 u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
 582 {
 583         u8 encoded_time = pwr_mode >> 2;
 584
 585         return (encoded_time < 10) ? encoded_time * 10
 586                                    : (encoded_time - 5) * 20;
 587 }
 588
 589 /* 0 on driver initialize and detected successfully, negative on failure. */
 590 static int cyapa_initialize(struct cyapa *cyapa)
 591 {
 592         int error = 0;
 593
 594         cyapa->state = CYAPA_STATE_NO_DEVICE;
 595         cyapa->gen = CYAPA_GEN_UNKNOWN;
 596         mutex_init(&cyapa->state_sync_lock);
 597
 598         /*
 599          * Set to hard code default, they will be updated with trackpad set
 600          * default values after probe and initialized.
 601          */
 602         cyapa->suspend_power_mode = PWR_MODE_SLEEP;
 603         cyapa->suspend_sleep_time =
 604                 cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
 605
 606         /* ops.initialize() is aimed to prepare for module communications. */
 607         error = cyapa_gen3_ops.initialize(cyapa);
 608         if (!error)
 609                 error = cyapa_gen5_ops.initialize(cyapa);
 610         if (!error)
 611                 error = cyapa_gen6_ops.initialize(cyapa);
 612         if (error)
 613                 return error;
 614
 615         error = cyapa_detect(cyapa);
 616         if (error)
 617                 return error;
 618
 619         /* Power down the device until we need it. */
 620         if (cyapa->operational)
 621                 cyapa->ops->set_power_mode(cyapa,
 622                                 PWR_MODE_OFF, 0, CYAPA_PM_ACTIVE);
 623
 624         return 0;
 625 }
 626
 627 static int cyapa_reinitialize(struct cyapa *cyapa)
 628 {
 629         struct device *dev = &cyapa->client->dev;
 630         struct input_dev *input = cyapa->input;
 631         int error;
 632
 633         if (pm_runtime_enabled(dev))
 634                 pm_runtime_disable(dev);
 635
 636         /* Avoid command failures when TP was in OFF state. */
 637         if (cyapa->operational)
 638                 cyapa->ops->set_power_mode(cyapa,
 639                                 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE);
 640
 641         error = cyapa_detect(cyapa);
 642         if (error)
 643                 goto out;
 644
 645         if (!input && cyapa->operational) {
 646                 error = cyapa_create_input_dev(cyapa);
 647                 if (error) {
 648                         dev_err(dev, "create input_dev instance failed: %d\n",
 649                                         error);
 650                         goto out;
 651                 }
 652         }
 653
 654 out:
 655         if (!input || !input->users) {
 656                 /* Reset to power OFF state to save power when no user open. */
 657                 if (cyapa->operational)
 658                         cyapa->ops->set_power_mode(cyapa,
 659                                         PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE);
 660         } else if (!error && cyapa->operational) {
 661                 /*
 662                  * Make sure only enable runtime PM when device is
 663                  * in operational mode and input->users > 0.
 664                  */
 665                 pm_runtime_set_active(dev);
 666                 pm_runtime_enable(dev);
 667
 668                 pm_runtime_get_sync(dev);
 669                 pm_runtime_mark_last_busy(dev);
 670                 pm_runtime_put_sync_autosuspend(dev);
 671         }
 672
 673         return error;
 674 }
 675
 676 static irqreturn_t cyapa_irq(int irq, void *dev_id)
 677 {
 678         struct cyapa *cyapa = dev_id;
 679         struct device *dev = &cyapa->client->dev;
 680         int error;
 681
 682         if (device_may_wakeup(dev))
 683                 pm_wakeup_event(dev, 0);
 684
 685         /* Interrupt event can be caused by host command to trackpad device. */
 686         if (cyapa->ops->irq_cmd_handler(cyapa)) {
 687                 /*
 688                  * Interrupt event maybe from trackpad device input reporting.
 689                  */
 690                 if (!cyapa->input) {
 691                         /*
 692                          * Still in probing or in firmware image
 693                          * updating or reading.
 694                          */
 695                         cyapa->ops->sort_empty_output_data(cyapa,
 696                                         NULL, NULL, NULL);
 697                         goto out;
 698                 }
 699
 700                 if (cyapa->operational) {
 701                         error = cyapa->ops->irq_handler(cyapa);
 702
 703                         /*
 704                          * Apply runtime power management to touch report event
 705                          * except the events caused by the command responses.
 706                          * Note:
 707                          * It will introduce about 20~40 ms additional delay
 708                          * time in receiving for first valid touch report data.
 709                          * The time is used to execute device runtime resume
 710                          * process.
 711                          */
 712                         pm_runtime_get_sync(dev);
 713                         pm_runtime_mark_last_busy(dev);
 714                         pm_runtime_put_sync_autosuspend(dev);
 715                 }
 716
 717                 if (!cyapa->operational || error) {
 718                         if (!mutex_trylock(&cyapa->state_sync_lock)) {
 719                                 cyapa->ops->sort_empty_output_data(cyapa,
 720                                         NULL, NULL, NULL);
 721                                 goto out;
 722                         }
 723                         cyapa_reinitialize(cyapa);
 724                         mutex_unlock(&cyapa->state_sync_lock);
 725                 }
 726         }
 727
 728 out:
 729         return IRQ_HANDLED;
 730 }
 731
 732 /*
 733  **************************************************************
 734  * sysfs interface
 735  **************************************************************
 736 */
 737 #ifdef CONFIG_PM_SLEEP
 738 static ssize_t cyapa_show_suspend_scanrate(struct device *dev,
 739                                            struct device_attribute *attr,
 740                                            char *buf)
 741 {
 742         struct cyapa *cyapa = dev_get_drvdata(dev);
 743         u8 pwr_cmd = cyapa->suspend_power_mode;
 744         u16 sleep_time;
 745         int len;
 746         int error;
 747
 748         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 749         if (error)
 750                 return error;
 751
 752         pwr_cmd = cyapa->suspend_power_mode;
 753         sleep_time = cyapa->suspend_sleep_time;
 754
 755         mutex_unlock(&cyapa->state_sync_lock);
 756
 757         switch (pwr_cmd) {
 758         case PWR_MODE_BTN_ONLY:
 759                 len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME);
 760                 break;
 761
 762         case PWR_MODE_OFF:
 763                 len = scnprintf(buf, PAGE_SIZE, "%s\n", OFF_MODE_NAME);
 764                 break;
 765
 766         default:
 767                 len = scnprintf(buf, PAGE_SIZE, "%u\n",
 768                                 cyapa->gen == CYAPA_GEN3 ?
 769                                         cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
 770                                         sleep_time);
 771                 break;
 772         }
 773
 774         return len;
 775 }
 776
 777 static ssize_t cyapa_update_suspend_scanrate(struct device *dev,
 778                                              struct device_attribute *attr,
 779                                              const char *buf, size_t count)
 780 {
 781         struct cyapa *cyapa = dev_get_drvdata(dev);
 782         u16 sleep_time;
 783         int error;
 784
 785         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 786         if (error)
 787                 return error;
 788
 789         if (sysfs_streq(buf, BTN_ONLY_MODE_NAME)) {
 790                 cyapa->suspend_power_mode = PWR_MODE_BTN_ONLY;
 791         } else if (sysfs_streq(buf, OFF_MODE_NAME)) {
 792                 cyapa->suspend_power_mode = PWR_MODE_OFF;
 793         } else if (!kstrtou16(buf, 10, &sleep_time)) {
 794                 cyapa->suspend_sleep_time = min_t(u16, sleep_time, 1000);
 795                 cyapa->suspend_power_mode =
 796                         cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time);
 797         } else {
 798                 count = -EINVAL;
 799         }
 800
 801         mutex_unlock(&cyapa->state_sync_lock);
 802
 803         return count;
 804 }
 805
 806 static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR,
 807                    cyapa_show_suspend_scanrate,
 808                    cyapa_update_suspend_scanrate);
 809
 810 static struct attribute *cyapa_power_wakeup_entries[] = {
 811         &dev_attr_suspend_scanrate_ms.attr,
 812         NULL,
 813 };
 814
 815 static const struct attribute_group cyapa_power_wakeup_group = {
 816         .name = power_group_name,
 817         .attrs = cyapa_power_wakeup_entries,
 818 };
 819
 820 static void cyapa_remove_power_wakeup_group(void *data)
 821 {
 822         struct cyapa *cyapa = data;
 823
 824         sysfs_unmerge_group(&cyapa->client->dev.kobj,
 825                                 &cyapa_power_wakeup_group);
 826 }
 827
 828 static int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
 829 {
 830         struct i2c_client *client = cyapa->client;
 831         struct device *dev = &client->dev;
 832         int error;
 833
 834         if (device_can_wakeup(dev)) {
 835                 error = sysfs_merge_group(&client->dev.kobj,
 836                                         &cyapa_power_wakeup_group);
 837                 if (error) {
 838                         dev_err(dev, "failed to add power wakeup group: %d\n",
 839                                 error);
 840                         return error;
 841                 }
 842
 843                 error = devm_add_action(dev,
 844                                 cyapa_remove_power_wakeup_group, cyapa);
 845                 if (error) {
 846                         cyapa_remove_power_wakeup_group(cyapa);
 847                         dev_err(dev, "failed to add power cleanup action: %d\n",
 848                                 error);
 849                         return error;
 850                 }
 851         }
 852
 853         return 0;
 854 }
 855 #else
 856 static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
 857 {
 858         return 0;
 859 }
 860 #endif /* CONFIG_PM_SLEEP */
 861
 862 #ifdef CONFIG_PM
 863 static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev,
 864                                               struct device_attribute *attr,
 865                                               char *buf)
 866 {
 867         struct cyapa *cyapa = dev_get_drvdata(dev);
 868         u8 pwr_cmd;
 869         u16 sleep_time;
 870         int error;
 871
 872         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 873         if (error)
 874                 return error;
 875
 876         pwr_cmd = cyapa->runtime_suspend_power_mode;
 877         sleep_time = cyapa->runtime_suspend_sleep_time;
 878
 879         mutex_unlock(&cyapa->state_sync_lock);
 880
 881         return scnprintf(buf, PAGE_SIZE, "%u\n",
 882                          cyapa->gen == CYAPA_GEN3 ?
 883                                 cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
 884                                 sleep_time);
 885 }
 886
 887 static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev,
 888                                                 struct device_attribute *attr,
 889                                                 const char *buf, size_t count)
 890 {
 891         struct cyapa *cyapa = dev_get_drvdata(dev);
 892         u16 time;
 893         int error;
 894
 895         if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) {
 896                 dev_err(dev, "invalid runtime suspend scanrate ms parameter\n");
 897                 return -EINVAL;
 898         }
 899
 900         /*
 901          * When the suspend scanrate is changed, pm_runtime_get to resume
 902          * a potentially suspended device, update to the new pwr_cmd
 903          * and then pm_runtime_put to suspend into the new power mode.
 904          */
 905         pm_runtime_get_sync(dev);
 906
 907         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 908         if (error)
 909                 return error;
 910
 911         cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000);
 912         cyapa->runtime_suspend_power_mode =
 913                 cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time);
 914
 915         mutex_unlock(&cyapa->state_sync_lock);
 916
 917         pm_runtime_put_sync_autosuspend(dev);
 918
 919         return count;
 920 }
 921
 922 static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR,
 923                    cyapa_show_rt_suspend_scanrate,
 924                    cyapa_update_rt_suspend_scanrate);
 925
 926 static struct attribute *cyapa_power_runtime_entries[] = {
 927         &dev_attr_runtime_suspend_scanrate_ms.attr,
 928         NULL,
 929 };
 930
 931 static const struct attribute_group cyapa_power_runtime_group = {
 932         .name = power_group_name,
 933         .attrs = cyapa_power_runtime_entries,
 934 };
 935
 936 static void cyapa_remove_power_runtime_group(void *data)
 937 {
 938         struct cyapa *cyapa = data;
 939
 940         sysfs_unmerge_group(&cyapa->client->dev.kobj,
 941                                 &cyapa_power_runtime_group);
 942 }
 943
 944 static int cyapa_start_runtime(struct cyapa *cyapa)
 945 {
 946         struct device *dev = &cyapa->client->dev;
 947         int error;
 948
 949         cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE;
 950         cyapa->runtime_suspend_sleep_time =
 951                 cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode);
 952
 953         error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group);
 954         if (error) {
 955                 dev_err(dev,
 956                         "failed to create power runtime group: %d\n", error);
 957                 return error;
 958         }
 959
 960         error = devm_add_action(dev, cyapa_remove_power_runtime_group, cyapa);
 961         if (error) {
 962                 cyapa_remove_power_runtime_group(cyapa);
 963                 dev_err(dev,
 964                         "failed to add power runtime cleanup action: %d\n",
 965                         error);
 966                 return error;
 967         }
 968
 969         /* runtime is enabled until device is operational and opened. */
 970         pm_runtime_set_suspended(dev);
 971         pm_runtime_use_autosuspend(dev);
 972         pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
 973
 974         return 0;
 975 }
 976 #else
 977 static inline int cyapa_start_runtime(struct cyapa *cyapa)
 978 {
 979         return 0;
 980 }
 981 #endif /* CONFIG_PM */
 982
 983 static ssize_t cyapa_show_fm_ver(struct device *dev,
 984                                  struct device_attribute *attr, char *buf)
 985 {
 986         int error;
 987         struct cyapa *cyapa = dev_get_drvdata(dev);
 988
 989         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 990         if (error)
 991                 return error;
 992         error = scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->fw_maj_ver,
 993                          cyapa->fw_min_ver);
 994         mutex_unlock(&cyapa->state_sync_lock);
 995         return error;
 996 }
 997
 998 static ssize_t cyapa_show_product_id(struct device *dev,
 999                                      struct device_attribute *attr, char *buf)
1000 {
1001         struct cyapa *cyapa = dev_get_drvdata(dev);
1002         int size;
1003         int error;
1004
1005         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1006         if (error)
1007                 return error;
1008         size = scnprintf(buf, PAGE_SIZE, "%s\n", cyapa->product_id);
1009         mutex_unlock(&cyapa->state_sync_lock);
1010         return size;
1011 }
1012
1013 static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name)
1014 {
1015         struct device *dev = &cyapa->client->dev;
1016         const struct firmware *fw;
1017         int error;
1018
1019         error = request_firmware(&fw, fw_name, dev);
1020         if (error) {
1021                 dev_err(dev, "Could not load firmware from %s: %d\n",
1022                         fw_name, error);
1023                 return error;
1024         }
1025
1026         error = cyapa->ops->check_fw(cyapa, fw);
1027         if (error) {
1028                 dev_err(dev, "Invalid CYAPA firmware image: %s\n",
1029                                 fw_name);
1030                 goto done;
1031         }
1032
1033         /*
1034          * Resume the potentially suspended device because doing FW
1035          * update on a device not in the FULL mode has a chance to
1036          * fail.
1037          */
1038         pm_runtime_get_sync(dev);
1039
1040         /* Require IRQ support for firmware update commands. */
1041         cyapa_enable_irq_for_cmd(cyapa);
1042
1043         error = cyapa->ops->bl_enter(cyapa);
1044         if (error) {
1045                 dev_err(dev, "bl_enter failed, %d\n", error);
1046                 goto err_detect;
1047         }
1048
1049         error = cyapa->ops->bl_activate(cyapa);
1050         if (error) {
1051                 dev_err(dev, "bl_activate failed, %d\n", error);
1052                 goto err_detect;
1053         }
1054
1055         error = cyapa->ops->bl_initiate(cyapa, fw);
1056         if (error) {
1057                 dev_err(dev, "bl_initiate failed, %d\n", error);
1058                 goto err_detect;
1059         }
1060
1061         error = cyapa->ops->update_fw(cyapa, fw);
1062         if (error) {
1063                 dev_err(dev, "update_fw failed, %d\n", error);
1064                 goto err_detect;
1065         }
1066
1067 err_detect:
1068         cyapa_disable_irq_for_cmd(cyapa);
1069         pm_runtime_put_noidle(dev);
1070
1071 done:
1072         release_firmware(fw);
1073         return error;
1074 }
1075
1076 static ssize_t cyapa_update_fw_store(struct device *dev,
1077                                      struct device_attribute *attr,
1078                                      const char *buf, size_t count)
1079 {
1080         struct cyapa *cyapa = dev_get_drvdata(dev);
1081         char fw_name[NAME_MAX];
1082         int ret, error;
1083
1084         if (count >= NAME_MAX) {
1085                 dev_err(dev, "File name too long\n");
1086                 return -EINVAL;
1087         }
1088
1089         memcpy(fw_name, buf, count);
1090         if (fw_name[count - 1] == '\n')
1091                 fw_name[count - 1] = '\0';
1092         else
1093                 fw_name[count] = '\0';
1094
1095         if (cyapa->input) {
1096                 /*
1097                  * Force the input device to be registered after the firmware
1098                  * image is updated, so if the corresponding parameters updated
1099                  * in the new firmware image can taken effect immediately.
1100                  */
1101                 input_unregister_device(cyapa->input);
1102                 cyapa->input = NULL;
1103         }
1104
1105         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1106         if (error) {
1107                 /*
1108                  * Whatever, do reinitialize to try to recover TP state to
1109                  * previous state just as it entered fw update entrance.
1110                  */
1111                 cyapa_reinitialize(cyapa);
1112                 return error;
1113         }
1114
1115         error = cyapa_firmware(cyapa, fw_name);
1116         if (error)
1117                 dev_err(dev, "firmware update failed: %d\n", error);
1118         else
1119                 dev_dbg(dev, "firmware update successfully done.\n");
1120
1121         /*
1122          * Re-detect trackpad device states because firmware update process
1123          * will reset trackpad device into bootloader mode.
1124          */
1125         ret = cyapa_reinitialize(cyapa);
1126         if (ret) {
1127                 dev_err(dev, "failed to re-detect after updated: %d\n", ret);
1128                 error = error ? error : ret;
1129         }
1130
1131         mutex_unlock(&cyapa->state_sync_lock);
1132
1133         return error ? error : count;
1134 }
1135
1136 static ssize_t cyapa_calibrate_store(struct device *dev,
1137                                      struct device_attribute *attr,
1138                                      const char *buf, size_t count)
1139 {
1140         struct cyapa *cyapa = dev_get_drvdata(dev);
1141         int error;
1142
1143         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1144         if (error)
1145                 return error;
1146
1147         if (cyapa->operational) {
1148                 cyapa_enable_irq_for_cmd(cyapa);
1149                 error = cyapa->ops->calibrate_store(dev, attr, buf, count);
1150                 cyapa_disable_irq_for_cmd(cyapa);
1151         } else {
1152                 error = -EBUSY;  /* Still running in bootloader mode. */
1153         }
1154
1155         mutex_unlock(&cyapa->state_sync_lock);
1156         return error < 0 ? error : count;
1157 }
1158
1159 static ssize_t cyapa_show_baseline(struct device *dev,
1160                                    struct device_attribute *attr, char *buf)
1161 {
1162         struct cyapa *cyapa = dev_get_drvdata(dev);
1163         ssize_t error;
1164
1165         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1166         if (error)
1167                 return error;
1168
1169         if (cyapa->operational) {
1170                 cyapa_enable_irq_for_cmd(cyapa);
1171                 error = cyapa->ops->show_baseline(dev, attr, buf);
1172                 cyapa_disable_irq_for_cmd(cyapa);
1173         } else {
1174                 error = -EBUSY;  /* Still running in bootloader mode. */
1175         }
1176
1177         mutex_unlock(&cyapa->state_sync_lock);
1178         return error;
1179 }
1180
1181 static char *cyapa_state_to_string(struct cyapa *cyapa)
1182 {
1183         switch (cyapa->state) {
1184         case CYAPA_STATE_BL_BUSY:
1185                 return "bootloader busy";
1186         case CYAPA_STATE_BL_IDLE:
1187                 return "bootloader idle";
1188         case CYAPA_STATE_BL_ACTIVE:
1189                 return "bootloader active";
1190         case CYAPA_STATE_GEN5_BL:
1191         case CYAPA_STATE_GEN6_BL:
1192                 return "bootloader";
1193         case CYAPA_STATE_OP:
1194         case CYAPA_STATE_GEN5_APP:
1195         case CYAPA_STATE_GEN6_APP:
1196                 return "operational";  /* Normal valid state. */
1197         default:
1198                 return "invalid mode";
1199         }
1200 }
1201
1202 static ssize_t cyapa_show_mode(struct device *dev,
1203                                    struct device_attribute *attr, char *buf)
1204 {
1205         struct cyapa *cyapa = dev_get_drvdata(dev);
1206         int size;
1207         int error;
1208
1209         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1210         if (error)
1211                 return error;
1212
1213         size = scnprintf(buf, PAGE_SIZE, "gen%d %s\n",
1214                         cyapa->gen, cyapa_state_to_string(cyapa));
1215
1216         mutex_unlock(&cyapa->state_sync_lock);
1217         return size;
1218 }
1219
1220 static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL);
1221 static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL);
1222 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store);
1223 static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL);
1224 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store);
1225 static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL);
1226
1227 static struct attribute *cyapa_sysfs_entries[] = {
1228         &dev_attr_firmware_version.attr,
1229         &dev_attr_product_id.attr,
1230         &dev_attr_update_fw.attr,
1231         &dev_attr_baseline.attr,
1232         &dev_attr_calibrate.attr,
1233         &dev_attr_mode.attr,
1234         NULL,
1235 };
1236
1237 static const struct attribute_group cyapa_sysfs_group = {
1238         .attrs = cyapa_sysfs_entries,
1239 };
1240
1241 static void cyapa_remove_sysfs_group(void *data)
1242 {
1243         struct cyapa *cyapa = data;
1244
1245         sysfs_remove_group(&cyapa->client->dev.kobj, &cyapa_sysfs_group);
1246 }
1247
1248 static void cyapa_disable_regulator(void *data)
1249 {
1250         struct cyapa *cyapa = data;
1251
1252         regulator_disable(cyapa->vcc);
1253 }
1254
1255 static int cyapa_probe(struct i2c_client *client,
1256                        const struct i2c_device_id *dev_id)
1257 {
1258         struct device *dev = &client->dev;
1259         struct cyapa *cyapa;
1260         u8 adapter_func;
1261         union i2c_smbus_data dummy;
1262         int error;
1263
1264         adapter_func = cyapa_check_adapter_functionality(client);
1265         if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
1266                 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1267                 return -EIO;
1268         }
1269
1270         /* Make sure there is something at this address */
1271         if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1272                         I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
1273                 return -ENODEV;
1274
1275         cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL);
1276         if (!cyapa)
1277                 return -ENOMEM;
1278
1279         /* i2c isn't supported, use smbus */
1280         if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
1281                 cyapa->smbus = true;
1282
1283         cyapa->client = client;
1284         i2c_set_clientdata(client, cyapa);
1285         sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
1286                 client->addr);
1287
1288         cyapa->vcc = devm_regulator_get(dev, "vcc");
1289         if (IS_ERR(cyapa->vcc)) {
1290                 error = PTR_ERR(cyapa->vcc);
1291                 dev_err(dev, "failed to get vcc regulator: %d\n", error);
1292                 return error;
1293         }
1294
1295         error = regulator_enable(cyapa->vcc);
1296         if (error) {
1297                 dev_err(dev, "failed to enable regulator: %d\n", error);
1298                 return error;
1299         }
1300
1301         error = devm_add_action(dev, cyapa_disable_regulator, cyapa);
1302         if (error) {
1303                 cyapa_disable_regulator(cyapa);
1304                 dev_err(dev, "failed to add disable regulator action: %d\n",
1305                         error);
1306                 return error;
1307         }
1308
1309         error = cyapa_initialize(cyapa);
1310         if (error) {
1311                 dev_err(dev, "failed to detect and initialize tp device.\n");
1312                 return error;
1313         }
1314
1315         error = sysfs_create_group(&client->dev.kobj, &cyapa_sysfs_group);
1316         if (error) {
1317                 dev_err(dev, "failed to create sysfs entries: %d\n", error);
1318                 return error;
1319         }
1320
1321         error = devm_add_action(dev, cyapa_remove_sysfs_group, cyapa);
1322         if (error) {
1323                 cyapa_remove_sysfs_group(cyapa);
1324                 dev_err(dev, "failed to add sysfs cleanup action: %d\n", error);
1325                 return error;
1326         }
1327
1328         error = cyapa_prepare_wakeup_controls(cyapa);
1329         if (error) {
1330                 dev_err(dev, "failed to prepare wakeup controls: %d\n", error);
1331                 return error;
1332         }
1333
1334         error = cyapa_start_runtime(cyapa);
1335         if (error) {
1336                 dev_err(dev, "failed to start pm_runtime: %d\n", error);
1337                 return error;
1338         }
1339
1340         error = devm_request_threaded_irq(dev, client->irq,
1341                                           NULL, cyapa_irq,
1342                                           IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1343                                           "cyapa", cyapa);
1344         if (error) {
1345                 dev_err(dev, "failed to request threaded irq: %d\n", error);
1346                 return error;
1347         }
1348
1349         /* Disable IRQ until the device is opened */
1350         disable_irq(client->irq);
1351
1352         /*
1353          * Register the device in the input subsystem when it's operational.
1354          * Otherwise, keep in this driver, so it can be be recovered or updated
1355          * through the sysfs mode and update_fw interfaces by user or apps.
1356          */
1357         if (cyapa->operational) {
1358                 error = cyapa_create_input_dev(cyapa);
1359                 if (error) {
1360                         dev_err(dev, "create input_dev instance failed: %d\n",
1361                                         error);
1362                         return error;
1363                 }
1364         }
1365
1366         return 0;
1367 }
1368
1369 static int __maybe_unused cyapa_suspend(struct device *dev)
1370 {
1371         struct i2c_client *client = to_i2c_client(dev);
1372         struct cyapa *cyapa = i2c_get_clientdata(client);
1373         u8 power_mode;
1374         int error;
1375
1376         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1377         if (error)
1378                 return error;
1379
1380         /*
1381          * Runtime PM is enable only when device is in operational mode and
1382          * users in use, so need check it before disable it to
1383          * avoid unbalance warning.
1384          */
1385         if (pm_runtime_enabled(dev))
1386                 pm_runtime_disable(dev);
1387         disable_irq(client->irq);
1388
1389         /*
1390          * Set trackpad device to idle mode if wakeup is allowed,
1391          * otherwise turn off.
1392          */
1393         if (cyapa->operational) {
1394                 power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode
1395                                                     : PWR_MODE_OFF;
1396                 error = cyapa->ops->set_power_mode(cyapa, power_mode,
1397                                 cyapa->suspend_sleep_time, CYAPA_PM_SUSPEND);
1398                 if (error)
1399                         dev_err(dev, "suspend set power mode failed: %d\n",
1400                                         error);
1401         }
1402
1403         /*
1404          * Disable proximity interrupt when system idle, want true touch to
1405          * wake the system.
1406          */
1407         if (cyapa->dev_pwr_mode != PWR_MODE_OFF)
1408                 cyapa->ops->set_proximity(cyapa, false);
1409
1410         if (device_may_wakeup(dev))
1411                 cyapa->irq_wake = (enable_irq_wake(client->irq) == 0);
1412
1413         mutex_unlock(&cyapa->state_sync_lock);
1414         return 0;
1415 }
1416
1417 static int __maybe_unused cyapa_resume(struct device *dev)
1418 {
1419         struct i2c_client *client = to_i2c_client(dev);
1420         struct cyapa *cyapa = i2c_get_clientdata(client);
1421         int error;
1422
1423         mutex_lock(&cyapa->state_sync_lock);
1424
1425         if (device_may_wakeup(dev) && cyapa->irq_wake) {
1426                 disable_irq_wake(client->irq);
1427                 cyapa->irq_wake = false;
1428         }
1429
1430         /*
1431          * Update device states and runtime PM states.
1432          * Re-Enable proximity interrupt after enter operational mode.
1433          */
1434         error = cyapa_reinitialize(cyapa);
1435         if (error)
1436                 dev_warn(dev, "failed to reinitialize TP device: %d\n", error);
1437
1438         enable_irq(client->irq);
1439
1440         mutex_unlock(&cyapa->state_sync_lock);
1441         return 0;
1442 }
1443
1444 static int __maybe_unused cyapa_runtime_suspend(struct device *dev)
1445 {
1446         struct cyapa *cyapa = dev_get_drvdata(dev);
1447         int error;
1448
1449         error = cyapa->ops->set_power_mode(cyapa,
1450                         cyapa->runtime_suspend_power_mode,
1451                         cyapa->runtime_suspend_sleep_time,
1452                         CYAPA_PM_RUNTIME_SUSPEND);
1453         if (error)
1454                 dev_warn(dev, "runtime suspend failed: %d\n", error);
1455
1456         return 0;
1457 }
1458
1459 static int __maybe_unused cyapa_runtime_resume(struct device *dev)
1460 {
1461         struct cyapa *cyapa = dev_get_drvdata(dev);
1462         int error;
1463
1464         error = cyapa->ops->set_power_mode(cyapa,
1465                         PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_RUNTIME_RESUME);
1466         if (error)
1467                 dev_warn(dev, "runtime resume failed: %d\n", error);
1468
1469         return 0;
1470 }
1471
1472 static const struct dev_pm_ops cyapa_pm_ops = {
1473         SET_SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume)
1474         SET_RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL)
1475 };
1476
1477 static const struct i2c_device_id cyapa_id_table[] = {
1478         { "cyapa", 0 },
1479         { },
1480 };
1481 MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
1482
1483 #ifdef CONFIG_ACPI
1484 static const struct acpi_device_id cyapa_acpi_id[] = {
1485         { "CYAP0000", 0 },  /* Gen3 trackpad with 0x67 I2C address. */
1486         { "CYAP0001", 0 },  /* Gen5 trackpad with 0x24 I2C address. */
1487         { "CYAP0002", 0 },  /* Gen6 trackpad with 0x24 I2C address. */
1488         { }
1489 };
1490 MODULE_DEVICE_TABLE(acpi, cyapa_acpi_id);
1491 #endif
1492
1493 #ifdef CONFIG_OF
1494 static const struct of_device_id cyapa_of_match[] = {
1495         { .compatible = "cypress,cyapa" },
1496         { /* sentinel */ }
1497 };
1498 MODULE_DEVICE_TABLE(of, cyapa_of_match);
1499 #endif
1500
1501 static struct i2c_driver cyapa_driver = {
1502         .driver = {
1503                 .name = "cyapa",
1504                 .pm = &cyapa_pm_ops,
1505                 .acpi_match_table = ACPI_PTR(cyapa_acpi_id),
1506                 .of_match_table = of_match_ptr(cyapa_of_match),
1507         },
1508
1509         .probe = cyapa_probe,
1510         .id_table = cyapa_id_table,
1511 };
1512
1513 module_i2c_driver(cyapa_driver);
1514
1515 MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
1516 MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
1517 MODULE_LICENSE("GPL");