1/* 2 * Synaptics touchpad with I2C interface 3 * 4 * Copyright (C) 2009 Compulab, Ltd. 5 * Mike Rapoport <mike@compulab.co.il> 6 * Igor Grinberg <grinberg@compulab.co.il> 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file COPYING in the main directory of this archive for 10 * more details. 11 */ 12 13#include <linux/module.h> 14#include <linux/i2c.h> 15#include <linux/irq.h> 16#include <linux/interrupt.h> 17#include <linux/input.h> 18#include <linux/delay.h> 19#include <linux/workqueue.h> 20#include <linux/slab.h> 21#include <linux/pm.h> 22 23#define DRIVER_NAME "synaptics_i2c" 24/* maximum product id is 15 characters */ 25#define PRODUCT_ID_LENGTH 15 26#define REGISTER_LENGTH 8 27 28/* 29 * after soft reset, we should wait for 1 ms 30 * before the device becomes operational 31 */ 32#define SOFT_RESET_DELAY_MS 3 33/* and after hard reset, we should wait for max 500ms */ 34#define HARD_RESET_DELAY_MS 500 35 36/* Registers by SMBus address */ 37#define PAGE_SEL_REG 0xff 38#define DEVICE_STATUS_REG 0x09 39 40/* Registers by RMI address */ 41#define DEV_CONTROL_REG 0x0000 42#define INTERRUPT_EN_REG 0x0001 43#define ERR_STAT_REG 0x0002 44#define INT_REQ_STAT_REG 0x0003 45#define DEV_COMMAND_REG 0x0004 46 47#define RMI_PROT_VER_REG 0x0200 48#define MANUFACT_ID_REG 0x0201 49#define PHYS_INT_VER_REG 0x0202 50#define PROD_PROPERTY_REG 0x0203 51#define INFO_QUERY_REG0 0x0204 52#define INFO_QUERY_REG1 (INFO_QUERY_REG0 + 1) 53#define INFO_QUERY_REG2 (INFO_QUERY_REG0 + 2) 54#define INFO_QUERY_REG3 (INFO_QUERY_REG0 + 3) 55 56#define PRODUCT_ID_REG0 0x0210 57#define PRODUCT_ID_REG1 (PRODUCT_ID_REG0 + 1) 58#define PRODUCT_ID_REG2 (PRODUCT_ID_REG0 + 2) 59#define PRODUCT_ID_REG3 (PRODUCT_ID_REG0 + 3) 60#define PRODUCT_ID_REG4 (PRODUCT_ID_REG0 + 4) 61#define PRODUCT_ID_REG5 (PRODUCT_ID_REG0 + 5) 62#define PRODUCT_ID_REG6 (PRODUCT_ID_REG0 + 6) 63#define PRODUCT_ID_REG7 (PRODUCT_ID_REG0 + 7) 64#define PRODUCT_ID_REG8 (PRODUCT_ID_REG0 + 8) 65#define PRODUCT_ID_REG9 (PRODUCT_ID_REG0 + 9) 66#define PRODUCT_ID_REG10 (PRODUCT_ID_REG0 + 10) 67#define PRODUCT_ID_REG11 (PRODUCT_ID_REG0 + 11) 68#define PRODUCT_ID_REG12 (PRODUCT_ID_REG0 + 12) 69#define PRODUCT_ID_REG13 (PRODUCT_ID_REG0 + 13) 70#define PRODUCT_ID_REG14 (PRODUCT_ID_REG0 + 14) 71#define PRODUCT_ID_REG15 (PRODUCT_ID_REG0 + 15) 72 73#define DATA_REG0 0x0400 74#define ABS_PRESSURE_REG 0x0401 75#define ABS_MSB_X_REG 0x0402 76#define ABS_LSB_X_REG (ABS_MSB_X_REG + 1) 77#define ABS_MSB_Y_REG 0x0404 78#define ABS_LSB_Y_REG (ABS_MSB_Y_REG + 1) 79#define REL_X_REG 0x0406 80#define REL_Y_REG 0x0407 81 82#define DEV_QUERY_REG0 0x1000 83#define DEV_QUERY_REG1 (DEV_QUERY_REG0 + 1) 84#define DEV_QUERY_REG2 (DEV_QUERY_REG0 + 2) 85#define DEV_QUERY_REG3 (DEV_QUERY_REG0 + 3) 86#define DEV_QUERY_REG4 (DEV_QUERY_REG0 + 4) 87#define DEV_QUERY_REG5 (DEV_QUERY_REG0 + 5) 88#define DEV_QUERY_REG6 (DEV_QUERY_REG0 + 6) 89#define DEV_QUERY_REG7 (DEV_QUERY_REG0 + 7) 90#define DEV_QUERY_REG8 (DEV_QUERY_REG0 + 8) 91 92#define GENERAL_2D_CONTROL_REG 0x1041 93#define SENSOR_SENSITIVITY_REG 0x1044 94#define SENS_MAX_POS_MSB_REG 0x1046 95#define SENS_MAX_POS_LSB_REG (SENS_MAX_POS_UPPER_REG + 1) 96 97/* Register bits */ 98/* Device Control Register Bits */ 99#define REPORT_RATE_1ST_BIT 6 100 101/* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */ 102#define F10_ABS_INT_ENA 0 103#define F10_REL_INT_ENA 1 104#define F20_INT_ENA 2 105 106/* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */ 107#define F10_ABS_INT_REQ 0 108#define F10_REL_INT_REQ 1 109#define F20_INT_REQ 2 110/* Device Status Register Bits (DEVICE_STATUS_REG) */ 111#define STAT_CONFIGURED 6 112#define STAT_ERROR 7 113 114/* Device Command Register Bits (DEV_COMMAND_REG) */ 115#define RESET_COMMAND 0x01 116#define REZERO_COMMAND 0x02 117 118/* Data Register 0 Bits (DATA_REG0) */ 119#define GESTURE 3 120 121/* Device Query Registers Bits */ 122/* DEV_QUERY_REG3 */ 123#define HAS_PALM_DETECT 1 124#define HAS_MULTI_FING 2 125#define HAS_SCROLLER 4 126#define HAS_2D_SCROLL 5 127 128/* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */ 129#define NO_DECELERATION 1 130#define REDUCE_REPORTING 3 131#define NO_FILTER 5 132 133/* Function Masks */ 134/* Device Control Register Masks (DEV_CONTROL_REG) */ 135#define REPORT_RATE_MSK 0xc0 136#define SLEEP_MODE_MSK 0x07 137 138/* Device Sleep Modes */ 139#define FULL_AWAKE 0x0 140#define NORMAL_OP 0x1 141#define LOW_PWR_OP 0x2 142#define VERY_LOW_PWR_OP 0x3 143#define SENS_SLEEP 0x4 144#define SLEEP_MOD 0x5 145#define DEEP_SLEEP 0x6 146#define HIBERNATE 0x7 147 148/* Interrupt Register Mask */ 149/* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */ 150#define INT_ENA_REQ_MSK 0x07 151#define INT_ENA_ABS_MSK 0x01 152#define INT_ENA_REL_MSK 0x02 153#define INT_ENA_F20_MSK 0x04 154 155/* Device Status Register Masks (DEVICE_STATUS_REG) */ 156#define CONFIGURED_MSK 0x40 157#define ERROR_MSK 0x80 158 159/* Data Register 0 Masks */ 160#define FINGER_WIDTH_MSK 0xf0 161#define GESTURE_MSK 0x08 162#define SENSOR_STATUS_MSK 0x07 163 164/* 165 * MSB Position Register Masks 166 * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG | 167 * DEV_QUERY_REG3 | DEV_QUERY_REG5 168 */ 169#define MSB_POSITION_MSK 0x1f 170 171/* Device Query Registers Masks */ 172 173/* DEV_QUERY_REG2 */ 174#define NUM_EXTRA_POS_MSK 0x07 175 176/* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */ 177#define THREAD_IRQ_SLEEP_SECS 2 178#define THREAD_IRQ_SLEEP_MSECS (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC) 179 180/* 181 * When in Polling mode and no data received for NO_DATA_THRES msecs 182 * reduce the polling rate to NO_DATA_SLEEP_MSECS 183 */ 184#define NO_DATA_THRES (MSEC_PER_SEC) 185#define NO_DATA_SLEEP_MSECS (MSEC_PER_SEC / 4) 186 187/* Control touchpad's No Deceleration option */ 188static bool no_decel = 1; 189module_param(no_decel, bool, 0644); 190MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)"); 191 192/* Control touchpad's Reduced Reporting option */ 193static bool reduce_report; 194module_param(reduce_report, bool, 0644); 195MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)"); 196 197/* Control touchpad's No Filter option */ 198static bool no_filter; 199module_param(no_filter, bool, 0644); 200MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)"); 201 202/* 203 * touchpad Attention line is Active Low and Open Drain, 204 * therefore should be connected to pulled up line 205 * and the irq configuration should be set to Falling Edge Trigger 206 */ 207/* Control IRQ / Polling option */ 208static bool polling_req; 209module_param(polling_req, bool, 0444); 210MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)"); 211 212/* Control Polling Rate */ 213static int scan_rate = 80; 214module_param(scan_rate, int, 0644); 215MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80"); 216 217/* The main device structure */ 218struct synaptics_i2c { 219 struct i2c_client *client; 220 struct input_dev *input; 221 struct delayed_work dwork; 222 spinlock_t lock; 223 int no_data_count; 224 int no_decel_param; 225 int reduce_report_param; 226 int no_filter_param; 227 int scan_rate_param; 228 int scan_ms; 229}; 230 231static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate) 232{ 233 touch->scan_ms = MSEC_PER_SEC / scan_rate; 234 touch->scan_rate_param = scan_rate; 235} 236 237/* 238 * Driver's initial design makes no race condition possible on i2c bus, 239 * so there is no need in any locking. 240 * Keep it in mind, while playing with the code. 241 */ 242static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg) 243{ 244 int ret; 245 246 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); 247 if (ret == 0) 248 ret = i2c_smbus_read_byte_data(client, reg & 0xff); 249 250 return ret; 251} 252 253static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val) 254{ 255 int ret; 256 257 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); 258 if (ret == 0) 259 ret = i2c_smbus_write_byte_data(client, reg & 0xff, val); 260 261 return ret; 262} 263 264static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg) 265{ 266 int ret; 267 268 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); 269 if (ret == 0) 270 ret = i2c_smbus_read_word_data(client, reg & 0xff); 271 272 return ret; 273} 274 275static int synaptics_i2c_config(struct i2c_client *client) 276{ 277 int ret, control; 278 u8 int_en; 279 280 /* set Report Rate to Device Highest (>=80) and Sleep to normal */ 281 ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1); 282 if (ret) 283 return ret; 284 285 /* set Interrupt Disable to Func20 / Enable to Func10) */ 286 int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK; 287 ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en); 288 if (ret) 289 return ret; 290 291 control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG); 292 /* No Deceleration */ 293 control |= no_decel ? 1 << NO_DECELERATION : 0; 294 /* Reduced Reporting */ 295 control |= reduce_report ? 1 << REDUCE_REPORTING : 0; 296 /* No Filter */ 297 control |= no_filter ? 1 << NO_FILTER : 0; 298 ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control); 299 if (ret) 300 return ret; 301 302 return 0; 303} 304 305static int synaptics_i2c_reset_config(struct i2c_client *client) 306{ 307 int ret; 308 309 /* Reset the Touchpad */ 310 ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND); 311 if (ret) { 312 dev_err(&client->dev, "Unable to reset device\n"); 313 } else { 314 msleep(SOFT_RESET_DELAY_MS); 315 ret = synaptics_i2c_config(client); 316 if (ret) 317 dev_err(&client->dev, "Unable to config device\n"); 318 } 319 320 return ret; 321} 322 323static int synaptics_i2c_check_error(struct i2c_client *client) 324{ 325 int status, ret = 0; 326 327 status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) & 328 (CONFIGURED_MSK | ERROR_MSK); 329 330 if (status != CONFIGURED_MSK) 331 ret = synaptics_i2c_reset_config(client); 332 333 return ret; 334} 335 336static bool synaptics_i2c_get_input(struct synaptics_i2c *touch) 337{ 338 struct input_dev *input = touch->input; 339 int xy_delta, gesture; 340 s32 data; 341 s8 x_delta, y_delta; 342 343 /* Deal with spontanious resets and errors */ 344 if (synaptics_i2c_check_error(touch->client)) 345 return 0; 346 347 /* Get Gesture Bit */ 348 data = synaptics_i2c_reg_get(touch->client, DATA_REG0); 349 gesture = (data >> GESTURE) & 0x1; 350 351 /* 352 * Get Relative axes. we have to get them in one shot, 353 * so we get 2 bytes starting from REL_X_REG. 354 */ 355 xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff; 356 357 /* Separate X from Y */ 358 x_delta = xy_delta & 0xff; 359 y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff; 360 361 /* Report the button event */ 362 input_report_key(input, BTN_LEFT, gesture); 363 364 /* Report the deltas */ 365 input_report_rel(input, REL_X, x_delta); 366 input_report_rel(input, REL_Y, -y_delta); 367 input_sync(input); 368 369 return xy_delta || gesture; 370} 371 372static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch, 373 unsigned long delay) 374{ 375 unsigned long flags; 376 377 spin_lock_irqsave(&touch->lock, flags); 378 379 mod_delayed_work(system_wq, &touch->dwork, delay); 380 381 spin_unlock_irqrestore(&touch->lock, flags); 382} 383 384static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id) 385{ 386 struct synaptics_i2c *touch = dev_id; 387 388 synaptics_i2c_reschedule_work(touch, 0); 389 390 return IRQ_HANDLED; 391} 392 393static void synaptics_i2c_check_params(struct synaptics_i2c *touch) 394{ 395 bool reset = false; 396 397 if (scan_rate != touch->scan_rate_param) 398 set_scan_rate(touch, scan_rate); 399 400 if (no_decel != touch->no_decel_param) { 401 touch->no_decel_param = no_decel; 402 reset = true; 403 } 404 405 if (no_filter != touch->no_filter_param) { 406 touch->no_filter_param = no_filter; 407 reset = true; 408 } 409 410 if (reduce_report != touch->reduce_report_param) { 411 touch->reduce_report_param = reduce_report; 412 reset = true; 413 } 414 415 if (reset) 416 synaptics_i2c_reset_config(touch->client); 417} 418 419/* Control the Device polling rate / Work Handler sleep time */ 420static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch, 421 bool have_data) 422{ 423 unsigned long delay, nodata_count_thres; 424 425 if (polling_req) { 426 delay = touch->scan_ms; 427 if (have_data) { 428 touch->no_data_count = 0; 429 } else { 430 nodata_count_thres = NO_DATA_THRES / touch->scan_ms; 431 if (touch->no_data_count < nodata_count_thres) 432 touch->no_data_count++; 433 else 434 delay = NO_DATA_SLEEP_MSECS; 435 } 436 return msecs_to_jiffies(delay); 437 } else { 438 delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS); 439 return round_jiffies_relative(delay); 440 } 441} 442 443/* Work Handler */ 444static void synaptics_i2c_work_handler(struct work_struct *work) 445{ 446 bool have_data; 447 struct synaptics_i2c *touch = 448 container_of(work, struct synaptics_i2c, dwork.work); 449 unsigned long delay; 450 451 synaptics_i2c_check_params(touch); 452 453 have_data = synaptics_i2c_get_input(touch); 454 delay = synaptics_i2c_adjust_delay(touch, have_data); 455 456 /* 457 * While interrupt driven, there is no real need to poll the device. 458 * But touchpads are very sensitive, so there could be errors 459 * related to physical environment and the attention line isn't 460 * necessarily asserted. In such case we can lose the touchpad. 461 * We poll the device once in THREAD_IRQ_SLEEP_SECS and 462 * if error is detected, we try to reset and reconfigure the touchpad. 463 */ 464 synaptics_i2c_reschedule_work(touch, delay); 465} 466 467static int synaptics_i2c_open(struct input_dev *input) 468{ 469 struct synaptics_i2c *touch = input_get_drvdata(input); 470 int ret; 471 472 ret = synaptics_i2c_reset_config(touch->client); 473 if (ret) 474 return ret; 475 476 if (polling_req) 477 synaptics_i2c_reschedule_work(touch, 478 msecs_to_jiffies(NO_DATA_SLEEP_MSECS)); 479 480 return 0; 481} 482 483static void synaptics_i2c_close(struct input_dev *input) 484{ 485 struct synaptics_i2c *touch = input_get_drvdata(input); 486 487 if (!polling_req) 488 synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0); 489 490 cancel_delayed_work_sync(&touch->dwork); 491 492 /* Save some power */ 493 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP); 494} 495 496static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch) 497{ 498 struct input_dev *input = touch->input; 499 500 input->name = touch->client->name; 501 input->phys = touch->client->adapter->name; 502 input->id.bustype = BUS_I2C; 503 input->id.version = synaptics_i2c_word_get(touch->client, 504 INFO_QUERY_REG0); 505 input->dev.parent = &touch->client->dev; 506 input->open = synaptics_i2c_open; 507 input->close = synaptics_i2c_close; 508 input_set_drvdata(input, touch); 509 510 /* Register the device as mouse */ 511 __set_bit(EV_REL, input->evbit); 512 __set_bit(REL_X, input->relbit); 513 __set_bit(REL_Y, input->relbit); 514 515 /* Register device's buttons and keys */ 516 __set_bit(EV_KEY, input->evbit); 517 __set_bit(BTN_LEFT, input->keybit); 518} 519 520static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client) 521{ 522 struct synaptics_i2c *touch; 523 524 touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL); 525 if (!touch) 526 return NULL; 527 528 touch->client = client; 529 touch->no_decel_param = no_decel; 530 touch->scan_rate_param = scan_rate; 531 set_scan_rate(touch, scan_rate); 532 INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler); 533 spin_lock_init(&touch->lock); 534 535 return touch; 536} 537 538static int synaptics_i2c_probe(struct i2c_client *client, 539 const struct i2c_device_id *dev_id) 540{ 541 int ret; 542 struct synaptics_i2c *touch; 543 544 touch = synaptics_i2c_touch_create(client); 545 if (!touch) 546 return -ENOMEM; 547 548 ret = synaptics_i2c_reset_config(client); 549 if (ret) 550 goto err_mem_free; 551 552 if (client->irq < 1) 553 polling_req = true; 554 555 touch->input = input_allocate_device(); 556 if (!touch->input) { 557 ret = -ENOMEM; 558 goto err_mem_free; 559 } 560 561 synaptics_i2c_set_input_params(touch); 562 563 if (!polling_req) { 564 dev_dbg(&touch->client->dev, 565 "Requesting IRQ: %d\n", touch->client->irq); 566 567 ret = request_irq(touch->client->irq, synaptics_i2c_irq, 568 IRQ_TYPE_EDGE_FALLING, 569 DRIVER_NAME, touch); 570 if (ret) { 571 dev_warn(&touch->client->dev, 572 "IRQ request failed: %d, " 573 "falling back to polling\n", ret); 574 polling_req = true; 575 synaptics_i2c_reg_set(touch->client, 576 INTERRUPT_EN_REG, 0); 577 } 578 } 579 580 if (polling_req) 581 dev_dbg(&touch->client->dev, 582 "Using polling at rate: %d times/sec\n", scan_rate); 583 584 /* Register the device in input subsystem */ 585 ret = input_register_device(touch->input); 586 if (ret) { 587 dev_err(&client->dev, 588 "Input device register failed: %d\n", ret); 589 goto err_input_free; 590 } 591 592 i2c_set_clientdata(client, touch); 593 594 return 0; 595 596err_input_free: 597 input_free_device(touch->input); 598err_mem_free: 599 kfree(touch); 600 601 return ret; 602} 603 604static int synaptics_i2c_remove(struct i2c_client *client) 605{ 606 struct synaptics_i2c *touch = i2c_get_clientdata(client); 607 608 if (!polling_req) 609 free_irq(client->irq, touch); 610 611 input_unregister_device(touch->input); 612 kfree(touch); 613 614 return 0; 615} 616 617#ifdef CONFIG_PM_SLEEP 618static int synaptics_i2c_suspend(struct device *dev) 619{ 620 struct i2c_client *client = to_i2c_client(dev); 621 struct synaptics_i2c *touch = i2c_get_clientdata(client); 622 623 cancel_delayed_work_sync(&touch->dwork); 624 625 /* Save some power */ 626 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP); 627 628 return 0; 629} 630 631static int synaptics_i2c_resume(struct device *dev) 632{ 633 int ret; 634 struct i2c_client *client = to_i2c_client(dev); 635 struct synaptics_i2c *touch = i2c_get_clientdata(client); 636 637 ret = synaptics_i2c_reset_config(client); 638 if (ret) 639 return ret; 640 641 synaptics_i2c_reschedule_work(touch, 642 msecs_to_jiffies(NO_DATA_SLEEP_MSECS)); 643 644 return 0; 645} 646#endif 647 648static SIMPLE_DEV_PM_OPS(synaptics_i2c_pm, synaptics_i2c_suspend, 649 synaptics_i2c_resume); 650 651static const struct i2c_device_id synaptics_i2c_id_table[] = { 652 { "synaptics_i2c", 0 }, 653 { }, 654}; 655MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table); 656 657static struct i2c_driver synaptics_i2c_driver = { 658 .driver = { 659 .name = DRIVER_NAME, 660 .owner = THIS_MODULE, 661 .pm = &synaptics_i2c_pm, 662 }, 663 664 .probe = synaptics_i2c_probe, 665 .remove = synaptics_i2c_remove, 666 667 .id_table = synaptics_i2c_id_table, 668}; 669 670module_i2c_driver(synaptics_i2c_driver); 671 672MODULE_DESCRIPTION("Synaptics I2C touchpad driver"); 673MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab"); 674MODULE_LICENSE("GPL"); 675 676