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  * @reg: 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_device_enabled(input)) {
 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_device_enabled(input)) {
 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_device_enabled(input)) {
 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;
 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 = sysfs_emit(buf, "%s\n", BTN_ONLY_MODE_NAME);
 760                 break;
 761
 762         case PWR_MODE_OFF:
 763                 len = sysfs_emit(buf, "%s\n", OFF_MODE_NAME);
 764                 break;
 765
 766         default:
 767                 len = sysfs_emit(buf, "%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(&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_or_reset(dev,
 844                                 cyapa_remove_power_wakeup_group, cyapa);
 845                 if (error) {
 846                         dev_err(dev, "failed to add power cleanup action: %d\n",
 847                                 error);
 848                         return error;
 849                 }
 850         }
 851
 852         return 0;
 853 }
 854 #else
 855 static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
 856 {
 857         return 0;
 858 }
 859 #endif /* CONFIG_PM_SLEEP */
 860
 861 #ifdef CONFIG_PM
 862 static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev,
 863                                               struct device_attribute *attr,
 864                                               char *buf)
 865 {
 866         struct cyapa *cyapa = dev_get_drvdata(dev);
 867         u8 pwr_cmd;
 868         u16 sleep_time;
 869         int error;
 870
 871         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 872         if (error)
 873                 return error;
 874
 875         pwr_cmd = cyapa->runtime_suspend_power_mode;
 876         sleep_time = cyapa->runtime_suspend_sleep_time;
 877
 878         mutex_unlock(&cyapa->state_sync_lock);
 879
 880         return sysfs_emit(buf, "%u\n",
 881                           cyapa->gen == CYAPA_GEN3 ?
 882                                 cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
 883                                 sleep_time);
 884 }
 885
 886 static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev,
 887                                                 struct device_attribute *attr,
 888                                                 const char *buf, size_t count)
 889 {
 890         struct cyapa *cyapa = dev_get_drvdata(dev);
 891         u16 time;
 892         int error;
 893
 894         if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) {
 895                 dev_err(dev, "invalid runtime suspend scanrate ms parameter\n");
 896                 return -EINVAL;
 897         }
 898
 899         /*
 900          * When the suspend scanrate is changed, pm_runtime_get to resume
 901          * a potentially suspended device, update to the new pwr_cmd
 902          * and then pm_runtime_put to suspend into the new power mode.
 903          */
 904         pm_runtime_get_sync(dev);
 905
 906         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 907         if (error)
 908                 return error;
 909
 910         cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000);
 911         cyapa->runtime_suspend_power_mode =
 912                 cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time);
 913
 914         mutex_unlock(&cyapa->state_sync_lock);
 915
 916         pm_runtime_put_sync_autosuspend(dev);
 917
 918         return count;
 919 }
 920
 921 static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR,
 922                    cyapa_show_rt_suspend_scanrate,
 923                    cyapa_update_rt_suspend_scanrate);
 924
 925 static struct attribute *cyapa_power_runtime_entries[] = {
 926         &dev_attr_runtime_suspend_scanrate_ms.attr,
 927         NULL,
 928 };
 929
 930 static const struct attribute_group cyapa_power_runtime_group = {
 931         .name = power_group_name,
 932         .attrs = cyapa_power_runtime_entries,
 933 };
 934
 935 static void cyapa_remove_power_runtime_group(void *data)
 936 {
 937         struct cyapa *cyapa = data;
 938
 939         sysfs_unmerge_group(&cyapa->client->dev.kobj,
 940                                 &cyapa_power_runtime_group);
 941 }
 942
 943 static int cyapa_start_runtime(struct cyapa *cyapa)
 944 {
 945         struct device *dev = &cyapa->client->dev;
 946         int error;
 947
 948         cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE;
 949         cyapa->runtime_suspend_sleep_time =
 950                 cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode);
 951
 952         error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group);
 953         if (error) {
 954                 dev_err(dev,
 955                         "failed to create power runtime group: %d\n", error);
 956                 return error;
 957         }
 958
 959         error = devm_add_action_or_reset(dev, cyapa_remove_power_runtime_group,
 960                                          cyapa);
 961         if (error) {
 962                 dev_err(dev,
 963                         "failed to add power runtime cleanup action: %d\n",
 964                         error);
 965                 return error;
 966         }
 967
 968         /* runtime is enabled until device is operational and opened. */
 969         pm_runtime_set_suspended(dev);
 970         pm_runtime_use_autosuspend(dev);
 971         pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
 972
 973         return 0;
 974 }
 975 #else
 976 static inline int cyapa_start_runtime(struct cyapa *cyapa)
 977 {
 978         return 0;
 979 }
 980 #endif /* CONFIG_PM */
 981
 982 static ssize_t cyapa_show_fm_ver(struct device *dev,
 983                                  struct device_attribute *attr, char *buf)
 984 {
 985         int error;
 986         struct cyapa *cyapa = dev_get_drvdata(dev);
 987
 988         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
 989         if (error)
 990                 return error;
 991         error = sysfs_emit(buf, "%d.%d\n",
 992                            cyapa->fw_maj_ver, cyapa->fw_min_ver);
 993         mutex_unlock(&cyapa->state_sync_lock);
 994         return error;
 995 }
 996
 997 static ssize_t cyapa_show_product_id(struct device *dev,
 998                                      struct device_attribute *attr, char *buf)
 999 {
1000         struct cyapa *cyapa = dev_get_drvdata(dev);
1001         int size;
1002         int error;
1003
1004         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1005         if (error)
1006                 return error;
1007         size = sysfs_emit(buf, "%s\n", cyapa->product_id);
1008         mutex_unlock(&cyapa->state_sync_lock);
1009         return size;
1010 }
1011
1012 static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name)
1013 {
1014         struct device *dev = &cyapa->client->dev;
1015         const struct firmware *fw;
1016         int error;
1017
1018         error = request_firmware(&fw, fw_name, dev);
1019         if (error) {
1020                 dev_err(dev, "Could not load firmware from %s: %d\n",
1021                         fw_name, error);
1022                 return error;
1023         }
1024
1025         error = cyapa->ops->check_fw(cyapa, fw);
1026         if (error) {
1027                 dev_err(dev, "Invalid CYAPA firmware image: %s\n",
1028                                 fw_name);
1029                 goto done;
1030         }
1031
1032         /*
1033          * Resume the potentially suspended device because doing FW
1034          * update on a device not in the FULL mode has a chance to
1035          * fail.
1036          */
1037         pm_runtime_get_sync(dev);
1038
1039         /* Require IRQ support for firmware update commands. */
1040         cyapa_enable_irq_for_cmd(cyapa);
1041
1042         error = cyapa->ops->bl_enter(cyapa);
1043         if (error) {
1044                 dev_err(dev, "bl_enter failed, %d\n", error);
1045                 goto err_detect;
1046         }
1047
1048         error = cyapa->ops->bl_activate(cyapa);
1049         if (error) {
1050                 dev_err(dev, "bl_activate failed, %d\n", error);
1051                 goto err_detect;
1052         }
1053
1054         error = cyapa->ops->bl_initiate(cyapa, fw);
1055         if (error) {
1056                 dev_err(dev, "bl_initiate failed, %d\n", error);
1057                 goto err_detect;
1058         }
1059
1060         error = cyapa->ops->update_fw(cyapa, fw);
1061         if (error) {
1062                 dev_err(dev, "update_fw failed, %d\n", error);
1063                 goto err_detect;
1064         }
1065
1066 err_detect:
1067         cyapa_disable_irq_for_cmd(cyapa);
1068         pm_runtime_put_noidle(dev);
1069
1070 done:
1071         release_firmware(fw);
1072         return error;
1073 }
1074
1075 static ssize_t cyapa_update_fw_store(struct device *dev,
1076                                      struct device_attribute *attr,
1077                                      const char *buf, size_t count)
1078 {
1079         struct cyapa *cyapa = dev_get_drvdata(dev);
1080         char fw_name[NAME_MAX];
1081         int ret, error;
1082
1083         if (count >= NAME_MAX) {
1084                 dev_err(dev, "File name too long\n");
1085                 return -EINVAL;
1086         }
1087
1088         memcpy(fw_name, buf, count);
1089         if (fw_name[count - 1] == '\n')
1090                 fw_name[count - 1] = '\0';
1091         else
1092                 fw_name[count] = '\0';
1093
1094         if (cyapa->input) {
1095                 /*
1096                  * Force the input device to be registered after the firmware
1097                  * image is updated, so if the corresponding parameters updated
1098                  * in the new firmware image can taken effect immediately.
1099                  */
1100                 input_unregister_device(cyapa->input);
1101                 cyapa->input = NULL;
1102         }
1103
1104         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1105         if (error) {
1106                 /*
1107                  * Whatever, do reinitialize to try to recover TP state to
1108                  * previous state just as it entered fw update entrance.
1109                  */
1110                 cyapa_reinitialize(cyapa);
1111                 return error;
1112         }
1113
1114         error = cyapa_firmware(cyapa, fw_name);
1115         if (error)
1116                 dev_err(dev, "firmware update failed: %d\n", error);
1117         else
1118                 dev_dbg(dev, "firmware update successfully done.\n");
1119
1120         /*
1121          * Re-detect trackpad device states because firmware update process
1122          * will reset trackpad device into bootloader mode.
1123          */
1124         ret = cyapa_reinitialize(cyapa);
1125         if (ret) {
1126                 dev_err(dev, "failed to re-detect after updated: %d\n", ret);
1127                 error = error ? error : ret;
1128         }
1129
1130         mutex_unlock(&cyapa->state_sync_lock);
1131
1132         return error ? error : count;
1133 }
1134
1135 static ssize_t cyapa_calibrate_store(struct device *dev,
1136                                      struct device_attribute *attr,
1137                                      const char *buf, size_t count)
1138 {
1139         struct cyapa *cyapa = dev_get_drvdata(dev);
1140         int error;
1141
1142         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1143         if (error)
1144                 return error;
1145
1146         if (cyapa->operational) {
1147                 cyapa_enable_irq_for_cmd(cyapa);
1148                 error = cyapa->ops->calibrate_store(dev, attr, buf, count);
1149                 cyapa_disable_irq_for_cmd(cyapa);
1150         } else {
1151                 error = -EBUSY;  /* Still running in bootloader mode. */
1152         }
1153
1154         mutex_unlock(&cyapa->state_sync_lock);
1155         return error < 0 ? error : count;
1156 }
1157
1158 static ssize_t cyapa_show_baseline(struct device *dev,
1159                                    struct device_attribute *attr, char *buf)
1160 {
1161         struct cyapa *cyapa = dev_get_drvdata(dev);
1162         ssize_t error;
1163
1164         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1165         if (error)
1166                 return error;
1167
1168         if (cyapa->operational) {
1169                 cyapa_enable_irq_for_cmd(cyapa);
1170                 error = cyapa->ops->show_baseline(dev, attr, buf);
1171                 cyapa_disable_irq_for_cmd(cyapa);
1172         } else {
1173                 error = -EBUSY;  /* Still running in bootloader mode. */
1174         }
1175
1176         mutex_unlock(&cyapa->state_sync_lock);
1177         return error;
1178 }
1179
1180 static char *cyapa_state_to_string(struct cyapa *cyapa)
1181 {
1182         switch (cyapa->state) {
1183         case CYAPA_STATE_BL_BUSY:
1184                 return "bootloader busy";
1185         case CYAPA_STATE_BL_IDLE:
1186                 return "bootloader idle";
1187         case CYAPA_STATE_BL_ACTIVE:
1188                 return "bootloader active";
1189         case CYAPA_STATE_GEN5_BL:
1190         case CYAPA_STATE_GEN6_BL:
1191                 return "bootloader";
1192         case CYAPA_STATE_OP:
1193         case CYAPA_STATE_GEN5_APP:
1194         case CYAPA_STATE_GEN6_APP:
1195                 return "operational";  /* Normal valid state. */
1196         default:
1197                 return "invalid mode";
1198         }
1199 }
1200
1201 static ssize_t cyapa_show_mode(struct device *dev,
1202                                    struct device_attribute *attr, char *buf)
1203 {
1204         struct cyapa *cyapa = dev_get_drvdata(dev);
1205         int size;
1206         int error;
1207
1208         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1209         if (error)
1210                 return error;
1211
1212         size = sysfs_emit(buf, "gen%d %s\n",
1213                           cyapa->gen, cyapa_state_to_string(cyapa));
1214
1215         mutex_unlock(&cyapa->state_sync_lock);
1216         return size;
1217 }
1218
1219 static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL);
1220 static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL);
1221 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store);
1222 static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL);
1223 static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store);
1224 static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL);
1225
1226 static struct attribute *cyapa_attrs[] = {
1227         &dev_attr_firmware_version.attr,
1228         &dev_attr_product_id.attr,
1229         &dev_attr_update_fw.attr,
1230         &dev_attr_baseline.attr,
1231         &dev_attr_calibrate.attr,
1232         &dev_attr_mode.attr,
1233         NULL,
1234 };
1235 ATTRIBUTE_GROUPS(cyapa);
1236
1237 static void cyapa_disable_regulator(void *data)
1238 {
1239         struct cyapa *cyapa = data;
1240
1241         regulator_disable(cyapa->vcc);
1242 }
1243
1244 static int cyapa_probe(struct i2c_client *client)
1245 {
1246         struct device *dev = &client->dev;
1247         struct cyapa *cyapa;
1248         u8 adapter_func;
1249         union i2c_smbus_data dummy;
1250         int error;
1251
1252         adapter_func = cyapa_check_adapter_functionality(client);
1253         if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
1254                 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1255                 return -EIO;
1256         }
1257
1258         /* Make sure there is something at this address */
1259         if (i2c_smbus_xfer(client->adapter, client->addr, 0,
1260                         I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
1261                 return -ENODEV;
1262
1263         cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL);
1264         if (!cyapa)
1265                 return -ENOMEM;
1266
1267         /* i2c isn't supported, use smbus */
1268         if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
1269                 cyapa->smbus = true;
1270
1271         cyapa->client = client;
1272         i2c_set_clientdata(client, cyapa);
1273         sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
1274                 client->addr);
1275
1276         cyapa->vcc = devm_regulator_get(dev, "vcc");
1277         if (IS_ERR(cyapa->vcc)) {
1278                 error = PTR_ERR(cyapa->vcc);
1279                 dev_err(dev, "failed to get vcc regulator: %d\n", error);
1280                 return error;
1281         }
1282
1283         error = regulator_enable(cyapa->vcc);
1284         if (error) {
1285                 dev_err(dev, "failed to enable regulator: %d\n", error);
1286                 return error;
1287         }
1288
1289         error = devm_add_action_or_reset(dev, cyapa_disable_regulator, cyapa);
1290         if (error) {
1291                 dev_err(dev, "failed to add disable regulator action: %d\n",
1292                         error);
1293                 return error;
1294         }
1295
1296         error = cyapa_initialize(cyapa);
1297         if (error) {
1298                 dev_err(dev, "failed to detect and initialize tp device.\n");
1299                 return error;
1300         }
1301
1302         error = cyapa_prepare_wakeup_controls(cyapa);
1303         if (error) {
1304                 dev_err(dev, "failed to prepare wakeup controls: %d\n", error);
1305                 return error;
1306         }
1307
1308         error = cyapa_start_runtime(cyapa);
1309         if (error) {
1310                 dev_err(dev, "failed to start pm_runtime: %d\n", error);
1311                 return error;
1312         }
1313
1314         error = devm_request_threaded_irq(dev, client->irq,
1315                                           NULL, cyapa_irq,
1316                                           IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1317                                           "cyapa", cyapa);
1318         if (error) {
1319                 dev_err(dev, "failed to request threaded irq: %d\n", error);
1320                 return error;
1321         }
1322
1323         /* Disable IRQ until the device is opened */
1324         disable_irq(client->irq);
1325
1326         /*
1327          * Register the device in the input subsystem when it's operational.
1328          * Otherwise, keep in this driver, so it can be be recovered or updated
1329          * through the sysfs mode and update_fw interfaces by user or apps.
1330          */
1331         if (cyapa->operational) {
1332                 error = cyapa_create_input_dev(cyapa);
1333                 if (error) {
1334                         dev_err(dev, "create input_dev instance failed: %d\n",
1335                                         error);
1336                         return error;
1337                 }
1338         }
1339
1340         return 0;
1341 }
1342
1343 static int cyapa_suspend(struct device *dev)
1344 {
1345         struct i2c_client *client = to_i2c_client(dev);
1346         struct cyapa *cyapa = i2c_get_clientdata(client);
1347         u8 power_mode;
1348         int error;
1349
1350         error = mutex_lock_interruptible(&cyapa->state_sync_lock);
1351         if (error)
1352                 return error;
1353
1354         /*
1355          * Runtime PM is enable only when device is in operational mode and
1356          * users in use, so need check it before disable it to
1357          * avoid unbalance warning.
1358          */
1359         if (pm_runtime_enabled(dev))
1360                 pm_runtime_disable(dev);
1361         disable_irq(client->irq);
1362
1363         /*
1364          * Set trackpad device to idle mode if wakeup is allowed,
1365          * otherwise turn off.
1366          */
1367         if (cyapa->operational) {
1368                 power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode
1369                                                     : PWR_MODE_OFF;
1370                 error = cyapa->ops->set_power_mode(cyapa, power_mode,
1371                                 cyapa->suspend_sleep_time, CYAPA_PM_SUSPEND);
1372                 if (error)
1373                         dev_err(dev, "suspend set power mode failed: %d\n",
1374                                         error);
1375         }
1376
1377         /*
1378          * Disable proximity interrupt when system idle, want true touch to
1379          * wake the system.
1380          */
1381         if (cyapa->dev_pwr_mode != PWR_MODE_OFF)
1382                 cyapa->ops->set_proximity(cyapa, false);
1383
1384         if (device_may_wakeup(dev))
1385                 cyapa->irq_wake = (enable_irq_wake(client->irq) == 0);
1386
1387         mutex_unlock(&cyapa->state_sync_lock);
1388         return 0;
1389 }
1390
1391 static int cyapa_resume(struct device *dev)
1392 {
1393         struct i2c_client *client = to_i2c_client(dev);
1394         struct cyapa *cyapa = i2c_get_clientdata(client);
1395         int error;
1396
1397         mutex_lock(&cyapa->state_sync_lock);
1398
1399         if (device_may_wakeup(dev) && cyapa->irq_wake) {
1400                 disable_irq_wake(client->irq);
1401                 cyapa->irq_wake = false;
1402         }
1403
1404         /*
1405          * Update device states and runtime PM states.
1406          * Re-Enable proximity interrupt after enter operational mode.
1407          */
1408         error = cyapa_reinitialize(cyapa);
1409         if (error)
1410                 dev_warn(dev, "failed to reinitialize TP device: %d\n", error);
1411
1412         enable_irq(client->irq);
1413
1414         mutex_unlock(&cyapa->state_sync_lock);
1415         return 0;
1416 }
1417
1418 static int cyapa_runtime_suspend(struct device *dev)
1419 {
1420         struct cyapa *cyapa = dev_get_drvdata(dev);
1421         int error;
1422
1423         error = cyapa->ops->set_power_mode(cyapa,
1424                         cyapa->runtime_suspend_power_mode,
1425                         cyapa->runtime_suspend_sleep_time,
1426                         CYAPA_PM_RUNTIME_SUSPEND);
1427         if (error)
1428                 dev_warn(dev, "runtime suspend failed: %d\n", error);
1429
1430         return 0;
1431 }
1432
1433 static int cyapa_runtime_resume(struct device *dev)
1434 {
1435         struct cyapa *cyapa = dev_get_drvdata(dev);
1436         int error;
1437
1438         error = cyapa->ops->set_power_mode(cyapa,
1439                         PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_RUNTIME_RESUME);
1440         if (error)
1441                 dev_warn(dev, "runtime resume failed: %d\n", error);
1442
1443         return 0;
1444 }
1445
1446 static const struct dev_pm_ops cyapa_pm_ops = {
1447         SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume)
1448         RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL)
1449 };
1450
1451 static const struct i2c_device_id cyapa_id_table[] = {
1452         { "cyapa", 0 },
1453         { },
1454 };
1455 MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
1456
1457 #ifdef CONFIG_ACPI
1458 static const struct acpi_device_id cyapa_acpi_id[] = {
1459         { "CYAP0000", 0 },  /* Gen3 trackpad with 0x67 I2C address. */
1460         { "CYAP0001", 0 },  /* Gen5 trackpad with 0x24 I2C address. */
1461         { "CYAP0002", 0 },  /* Gen6 trackpad with 0x24 I2C address. */
1462         { }
1463 };
1464 MODULE_DEVICE_TABLE(acpi, cyapa_acpi_id);
1465 #endif
1466
1467 #ifdef CONFIG_OF
1468 static const struct of_device_id cyapa_of_match[] = {
1469         { .compatible = "cypress,cyapa" },
1470         { /* sentinel */ }
1471 };
1472 MODULE_DEVICE_TABLE(of, cyapa_of_match);
1473 #endif
1474
1475 static struct i2c_driver cyapa_driver = {
1476         .driver = {
1477                 .name = "cyapa",
1478                 .dev_groups = cyapa_groups,
1479                 .pm = pm_ptr(&cyapa_pm_ops),
1480                 .acpi_match_table = ACPI_PTR(cyapa_acpi_id),
1481                 .of_match_table = of_match_ptr(cyapa_of_match),
1482         },
1483
1484         .probe = cyapa_probe,
1485         .id_table = cyapa_id_table,
1486 };
1487
1488 module_i2c_driver(cyapa_driver);
1489
1490 MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
1491 MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
1492 MODULE_LICENSE("GPL");