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 22#define DRIVER_NAME "synaptics_i2c" 23/* maximum product id is 15 characters */ 24#define PRODUCT_ID_LENGTH 15 25#define REGISTER_LENGTH 8 26 27/* 28 * after soft reset, we should wait for 1 ms 29 * before the device becomes operational 30 */ 31#define SOFT_RESET_DELAY_MS 3 32/* and after hard reset, we should wait for max 500ms */ 33#define HARD_RESET_DELAY_MS 500 34 35/* Registers by SMBus address */ 36#define PAGE_SEL_REG 0xff 37#define DEVICE_STATUS_REG 0x09 38 39/* Registers by RMI address */ 40#define DEV_CONTROL_REG 0x0000 41#define INTERRUPT_EN_REG 0x0001 42#define ERR_STAT_REG 0x0002 43#define INT_REQ_STAT_REG 0x0003 44#define DEV_COMMAND_REG 0x0004 45 46#define RMI_PROT_VER_REG 0x0200 47#define MANUFACT_ID_REG 0x0201 48#define PHYS_INT_VER_REG 0x0202 49#define PROD_PROPERTY_REG 0x0203 50#define INFO_QUERY_REG0 0x0204 51#define INFO_QUERY_REG1 (INFO_QUERY_REG0 + 1) 52#define INFO_QUERY_REG2 (INFO_QUERY_REG0 + 2) 53#define INFO_QUERY_REG3 (INFO_QUERY_REG0 + 3) 54 55#define PRODUCT_ID_REG0 0x0210 56#define PRODUCT_ID_REG1 (PRODUCT_ID_REG0 + 1) 57#define PRODUCT_ID_REG2 (PRODUCT_ID_REG0 + 2) 58#define PRODUCT_ID_REG3 (PRODUCT_ID_REG0 + 3) 59#define PRODUCT_ID_REG4 (PRODUCT_ID_REG0 + 4) 60#define PRODUCT_ID_REG5 (PRODUCT_ID_REG0 + 5) 61#define PRODUCT_ID_REG6 (PRODUCT_ID_REG0 + 6) 62#define PRODUCT_ID_REG7 (PRODUCT_ID_REG0 + 7) 63#define PRODUCT_ID_REG8 (PRODUCT_ID_REG0 + 8) 64#define PRODUCT_ID_REG9 (PRODUCT_ID_REG0 + 9) 65#define PRODUCT_ID_REG10 (PRODUCT_ID_REG0 + 10) 66#define PRODUCT_ID_REG11 (PRODUCT_ID_REG0 + 11) 67#define PRODUCT_ID_REG12 (PRODUCT_ID_REG0 + 12) 68#define PRODUCT_ID_REG13 (PRODUCT_ID_REG0 + 13) 69#define PRODUCT_ID_REG14 (PRODUCT_ID_REG0 + 14) 70#define PRODUCT_ID_REG15 (PRODUCT_ID_REG0 + 15) 71 72#define DATA_REG0 0x0400 73#define ABS_PRESSURE_REG 0x0401 74#define ABS_MSB_X_REG 0x0402 75#define ABS_LSB_X_REG (ABS_MSB_X_REG + 1) 76#define ABS_MSB_Y_REG 0x0404 77#define ABS_LSB_Y_REG (ABS_MSB_Y_REG + 1) 78#define REL_X_REG 0x0406 79#define REL_Y_REG 0x0407 80 81#define DEV_QUERY_REG0 0x1000 82#define DEV_QUERY_REG1 (DEV_QUERY_REG0 + 1) 83#define DEV_QUERY_REG2 (DEV_QUERY_REG0 + 2) 84#define DEV_QUERY_REG3 (DEV_QUERY_REG0 + 3) 85#define DEV_QUERY_REG4 (DEV_QUERY_REG0 + 4) 86#define DEV_QUERY_REG5 (DEV_QUERY_REG0 + 5) 87#define DEV_QUERY_REG6 (DEV_QUERY_REG0 + 6) 88#define DEV_QUERY_REG7 (DEV_QUERY_REG0 + 7) 89#define DEV_QUERY_REG8 (DEV_QUERY_REG0 + 8) 90 91#define GENERAL_2D_CONTROL_REG 0x1041 92#define SENSOR_SENSITIVITY_REG 0x1044 93#define SENS_MAX_POS_MSB_REG 0x1046 94#define SENS_MAX_POS_LSB_REG (SENS_MAX_POS_UPPER_REG + 1) 95 96/* Register bits */ 97/* Device Control Register Bits */ 98#define REPORT_RATE_1ST_BIT 6 99 100/* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */ 101#define F10_ABS_INT_ENA 0 102#define F10_REL_INT_ENA 1 103#define F20_INT_ENA 2 104 105/* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */ 106#define F10_ABS_INT_REQ 0 107#define F10_REL_INT_REQ 1 108#define F20_INT_REQ 2 109/* Device Status Register Bits (DEVICE_STATUS_REG) */ 110#define STAT_CONFIGURED 6 111#define STAT_ERROR 7 112 113/* Device Command Register Bits (DEV_COMMAND_REG) */ 114#define RESET_COMMAND 0x01 115#define REZERO_COMMAND 0x02 116 117/* Data Register 0 Bits (DATA_REG0) */ 118#define GESTURE 3 119 120/* Device Query Registers Bits */ 121/* DEV_QUERY_REG3 */ 122#define HAS_PALM_DETECT 1 123#define HAS_MULTI_FING 2 124#define HAS_SCROLLER 4 125#define HAS_2D_SCROLL 5 126 127/* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */ 128#define NO_DECELERATION 1 129#define REDUCE_REPORTING 3 130#define NO_FILTER 5 131 132/* Function Masks */ 133/* Device Control Register Masks (DEV_CONTROL_REG) */ 134#define REPORT_RATE_MSK 0xc0 135#define SLEEP_MODE_MSK 0x07 136 137/* Device Sleep Modes */ 138#define FULL_AWAKE 0x0 139#define NORMAL_OP 0x1 140#define LOW_PWR_OP 0x2 141#define VERY_LOW_PWR_OP 0x3 142#define SENS_SLEEP 0x4 143#define SLEEP_MOD 0x5 144#define DEEP_SLEEP 0x6 145#define HIBERNATE 0x7 146 147/* Interrupt Register Mask */ 148/* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */ 149#define INT_ENA_REQ_MSK 0x07 150#define INT_ENA_ABS_MSK 0x01 151#define INT_ENA_REL_MSK 0x02 152#define INT_ENA_F20_MSK 0x04 153 154/* Device Status Register Masks (DEVICE_STATUS_REG) */ 155#define CONFIGURED_MSK 0x40 156#define ERROR_MSK 0x80 157 158/* Data Register 0 Masks */ 159#define FINGER_WIDTH_MSK 0xf0 160#define GESTURE_MSK 0x08 161#define SENSOR_STATUS_MSK 0x07 162 163/* 164 * MSB Position Register Masks 165 * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG | 166 * DEV_QUERY_REG3 | DEV_QUERY_REG5 167 */ 168#define MSB_POSITION_MSK 0x1f 169 170/* Device Query Registers Masks */ 171 172/* DEV_QUERY_REG2 */ 173#define NUM_EXTRA_POS_MSK 0x07 174 175/* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */ 176#define THREAD_IRQ_SLEEP_SECS 2 177#define THREAD_IRQ_SLEEP_MSECS (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC) 178 179/* 180 * When in Polling mode and no data received for NO_DATA_THRES msecs 181 * reduce the polling rate to NO_DATA_SLEEP_MSECS 182 */ 183#define NO_DATA_THRES (MSEC_PER_SEC) 184#define NO_DATA_SLEEP_MSECS (MSEC_PER_SEC / 4) 185 186/* Control touchpad's No Deceleration option */ 187static int no_decel = 1; 188module_param(no_decel, bool, 0644); 189MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)"); 190 191/* Control touchpad's Reduced Reporting option */ 192static int reduce_report; 193module_param(reduce_report, bool, 0644); 194MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)"); 195 196/* Control touchpad's No Filter option */ 197static int no_filter; 198module_param(no_filter, bool, 0644); 199MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)"); 200 201/* 202 * touchpad Attention line is Active Low and Open Drain, 203 * therefore should be connected to pulled up line 204 * and the irq configuration should be set to Falling Edge Trigger 205 */ 206/* Control IRQ / Polling option */ 207static bool polling_req; 208module_param(polling_req, bool, 0444); 209MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)"); 210 211/* Control Polling Rate */ 212static int scan_rate = 80; 213module_param(scan_rate, int, 0644); 214MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80"); 215 216/* The main device structure */ 217struct synaptics_i2c { 218 struct i2c_client *client; 219 struct input_dev *input; 220 struct delayed_work dwork; 221 spinlock_t lock; 222 int no_data_count; 223 int no_decel_param; 224 int reduce_report_param; 225 int no_filter_param; 226 int scan_rate_param; 227 int scan_ms; 228}; 229 230static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate) 231{ 232 touch->scan_ms = MSEC_PER_SEC / scan_rate; 233 touch->scan_rate_param = scan_rate; 234} 235 236/* 237 * Driver's initial design makes no race condition possible on i2c bus, 238 * so there is no need in any locking. 239 * Keep it in mind, while playing with the code. 240 */ 241static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg) 242{ 243 int ret; 244 245 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); 246 if (ret == 0) 247 ret = i2c_smbus_read_byte_data(client, reg & 0xff); 248 249 return ret; 250} 251 252static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val) 253{ 254 int ret; 255 256 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); 257 if (ret == 0) 258 ret = i2c_smbus_write_byte_data(client, reg & 0xff, val); 259 260 return ret; 261} 262 263static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg) 264{ 265 int ret; 266 267 ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); 268 if (ret == 0) 269 ret = i2c_smbus_read_word_data(client, reg & 0xff); 270 271 return ret; 272} 273 274static int synaptics_i2c_config(struct i2c_client *client) 275{ 276 int ret, control; 277 u8 int_en; 278 279 /* set Report Rate to Device Highest (>=80) and Sleep to normal */ 280 ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1); 281 if (ret) 282 return ret; 283 284 /* set Interrupt Disable to Func20 / Enable to Func10) */ 285 int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK; 286 ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en); 287 if (ret) 288 return ret; 289 290 control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG); 291 /* No Deceleration */ 292 control |= no_decel ? 1 << NO_DECELERATION : 0; 293 /* Reduced Reporting */ 294 control |= reduce_report ? 1 << REDUCE_REPORTING : 0; 295 /* No Filter */ 296 control |= no_filter ? 1 << NO_FILTER : 0; 297 ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control); 298 if (ret) 299 return ret; 300 301 return 0; 302} 303 304static int synaptics_i2c_reset_config(struct i2c_client *client) 305{ 306 int ret; 307 308 /* Reset the Touchpad */ 309 ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND); 310 if (ret) { 311 dev_err(&client->dev, "Unable to reset device\n"); 312 } else { 313 msleep(SOFT_RESET_DELAY_MS); 314 ret = synaptics_i2c_config(client); 315 if (ret) 316 dev_err(&client->dev, "Unable to config device\n"); 317 } 318 319 return ret; 320} 321 322static int synaptics_i2c_check_error(struct i2c_client *client) 323{ 324 int status, ret = 0; 325 326 status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) & 327 (CONFIGURED_MSK | ERROR_MSK); 328 329 if (status != CONFIGURED_MSK) 330 ret = synaptics_i2c_reset_config(client); 331 332 return ret; 333} 334 335static bool synaptics_i2c_get_input(struct synaptics_i2c *touch) 336{ 337 struct input_dev *input = touch->input; 338 int xy_delta, gesture; 339 s32 data; 340 s8 x_delta, y_delta; 341 342 /* Deal with spontanious resets and errors */ 343 if (synaptics_i2c_check_error(touch->client)) 344 return 0; 345 346 /* Get Gesture Bit */ 347 data = synaptics_i2c_reg_get(touch->client, DATA_REG0); 348 gesture = (data >> GESTURE) & 0x1; 349 350 /* 351 * Get Relative axes. we have to get them in one shot, 352 * so we get 2 bytes starting from REL_X_REG. 353 */ 354 xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff; 355 356 /* Separate X from Y */ 357 x_delta = xy_delta & 0xff; 358 y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff; 359 360 /* Report the button event */ 361 input_report_key(input, BTN_LEFT, gesture); 362 363 /* Report the deltas */ 364 input_report_rel(input, REL_X, x_delta); 365 input_report_rel(input, REL_Y, -y_delta); 366 input_sync(input); 367 368 return xy_delta || gesture; 369} 370 371static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch, 372 unsigned long delay) 373{ 374 unsigned long flags; 375 376 spin_lock_irqsave(&touch->lock, flags); 377 378 /* 379 * If work is already scheduled then subsequent schedules will not 380 * change the scheduled time that's why we have to cancel it first. 381 */ 382 __cancel_delayed_work(&touch->dwork); 383 schedule_delayed_work(&touch->dwork, delay); 384 385 spin_unlock_irqrestore(&touch->lock, flags); 386} 387 388static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id) 389{ 390 struct synaptics_i2c *touch = dev_id; 391 392 synaptics_i2c_reschedule_work(touch, 0); 393 394 return IRQ_HANDLED; 395} 396 397static void synaptics_i2c_check_params(struct synaptics_i2c *touch) 398{ 399 bool reset = false; 400 401 if (scan_rate != touch->scan_rate_param) 402 set_scan_rate(touch, scan_rate); 403 404 if (no_decel != touch->no_decel_param) { 405 touch->no_decel_param = no_decel; 406 reset = true; 407 } 408 409 if (no_filter != touch->no_filter_param) { 410 touch->no_filter_param = no_filter; 411 reset = true; 412 } 413 414 if (reduce_report != touch->reduce_report_param) { 415 touch->reduce_report_param = reduce_report; 416 reset = true; 417 } 418 419 if (reset) 420 synaptics_i2c_reset_config(touch->client); 421} 422 423/* Control the Device polling rate / Work Handler sleep time */ 424static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch, 425 bool have_data) 426{ 427 unsigned long delay, nodata_count_thres; 428 429 if (polling_req) { 430 delay = touch->scan_ms; 431 if (have_data) { 432 touch->no_data_count = 0; 433 } else { 434 nodata_count_thres = NO_DATA_THRES / touch->scan_ms; 435 if (touch->no_data_count < nodata_count_thres) 436 touch->no_data_count++; 437 else 438 delay = NO_DATA_SLEEP_MSECS; 439 } 440 return msecs_to_jiffies(delay); 441 } else { 442 delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS); 443 return round_jiffies_relative(delay); 444 } 445} 446 447/* Work Handler */ 448static void synaptics_i2c_work_handler(struct work_struct *work) 449{ 450 bool have_data; 451 struct synaptics_i2c *touch = 452 container_of(work, struct synaptics_i2c, dwork.work); 453 unsigned long delay; 454 455 synaptics_i2c_check_params(touch); 456 457 have_data = synaptics_i2c_get_input(touch); 458 delay = synaptics_i2c_adjust_delay(touch, have_data); 459 460 /* 461 * While interrupt driven, there is no real need to poll the device. 462 * But touchpads are very sensitive, so there could be errors 463 * related to physical environment and the attention line isn't 464 * neccesarily asserted. In such case we can lose the touchpad. 465 * We poll the device once in THREAD_IRQ_SLEEP_SECS and 466 * if error is detected, we try to reset and reconfigure the touchpad. 467 */ 468 synaptics_i2c_reschedule_work(touch, delay); 469} 470 471static int synaptics_i2c_open(struct input_dev *input) 472{ 473 struct synaptics_i2c *touch = input_get_drvdata(input); 474 int ret; 475 476 ret = synaptics_i2c_reset_config(touch->client); 477 if (ret) 478 return ret; 479 480 if (polling_req) 481 synaptics_i2c_reschedule_work(touch, 482 msecs_to_jiffies(NO_DATA_SLEEP_MSECS)); 483 484 return 0; 485} 486 487static void synaptics_i2c_close(struct input_dev *input) 488{ 489 struct synaptics_i2c *touch = input_get_drvdata(input); 490 491 if (!polling_req) 492 synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0); 493 494 cancel_delayed_work_sync(&touch->dwork); 495 496 /* Save some power */ 497 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP); 498} 499 500static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch) 501{ 502 struct input_dev *input = touch->input; 503 504 input->name = touch->client->name; 505 input->phys = touch->client->adapter->name; 506 input->id.bustype = BUS_I2C; 507 input->id.version = synaptics_i2c_word_get(touch->client, 508 INFO_QUERY_REG0); 509 input->dev.parent = &touch->client->dev; 510 input->open = synaptics_i2c_open; 511 input->close = synaptics_i2c_close; 512 input_set_drvdata(input, touch); 513 514 /* Register the device as mouse */ 515 __set_bit(EV_REL, input->evbit); 516 __set_bit(REL_X, input->relbit); 517 __set_bit(REL_Y, input->relbit); 518 519 /* Register device's buttons and keys */ 520 __set_bit(EV_KEY, input->evbit); 521 __set_bit(BTN_LEFT, input->keybit); 522} 523 524static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client) 525{ 526 struct synaptics_i2c *touch; 527 528 touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL); 529 if (!touch) 530 return NULL; 531 532 touch->client = client; 533 touch->no_decel_param = no_decel; 534 touch->scan_rate_param = scan_rate; 535 set_scan_rate(touch, scan_rate); 536 INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler); 537 spin_lock_init(&touch->lock); 538 539 return touch; 540} 541 542static int __devinit synaptics_i2c_probe(struct i2c_client *client, 543 const struct i2c_device_id *dev_id) 544{ 545 int ret; 546 struct synaptics_i2c *touch; 547 548 touch = synaptics_i2c_touch_create(client); 549 if (!touch) 550 return -ENOMEM; 551 552 ret = synaptics_i2c_reset_config(client); 553 if (ret) 554 goto err_mem_free; 555 556 if (client->irq < 1) 557 polling_req = true; 558 559 touch->input = input_allocate_device(); 560 if (!touch->input) { 561 ret = -ENOMEM; 562 goto err_mem_free; 563 } 564 565 synaptics_i2c_set_input_params(touch); 566 567 if (!polling_req) { 568 dev_dbg(&touch->client->dev, 569 "Requesting IRQ: %d\n", touch->client->irq); 570 571 ret = request_irq(touch->client->irq, synaptics_i2c_irq, 572 IRQF_DISABLED|IRQ_TYPE_EDGE_FALLING, 573 DRIVER_NAME, touch); 574 if (ret) { 575 dev_warn(&touch->client->dev, 576 "IRQ request failed: %d, " 577 "falling back to polling\n", ret); 578 polling_req = true; 579 synaptics_i2c_reg_set(touch->client, 580 INTERRUPT_EN_REG, 0); 581 } 582 } 583 584 if (polling_req) 585 dev_dbg(&touch->client->dev, 586 "Using polling at rate: %d times/sec\n", scan_rate); 587 588 /* Register the device in input subsystem */ 589 ret = input_register_device(touch->input); 590 if (ret) { 591 dev_err(&client->dev, 592 "Input device register failed: %d\n", ret); 593 goto err_input_free; 594 } 595 596 i2c_set_clientdata(client, touch); 597 598 return 0; 599 600err_input_free: 601 input_free_device(touch->input); 602err_mem_free: 603 kfree(touch); 604 605 return ret; 606} 607 608static int __devexit synaptics_i2c_remove(struct i2c_client *client) 609{ 610 struct synaptics_i2c *touch = i2c_get_clientdata(client); 611 612 if (!polling_req) 613 free_irq(client->irq, touch); 614 615 input_unregister_device(touch->input); 616 kfree(touch); 617 618 return 0; 619} 620 621#ifdef CONFIG_PM 622static int synaptics_i2c_suspend(struct i2c_client *client, pm_message_t mesg) 623{ 624 struct synaptics_i2c *touch = i2c_get_clientdata(client); 625 626 cancel_delayed_work_sync(&touch->dwork); 627 628 /* Save some power */ 629 synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP); 630 631 return 0; 632} 633 634static int synaptics_i2c_resume(struct i2c_client *client) 635{ 636 int ret; 637 struct synaptics_i2c *touch = i2c_get_clientdata(client); 638 639 ret = synaptics_i2c_reset_config(client); 640 if (ret) 641 return ret; 642 643 synaptics_i2c_reschedule_work(touch, 644 msecs_to_jiffies(NO_DATA_SLEEP_MSECS)); 645 646 return 0; 647} 648#else 649#define synaptics_i2c_suspend NULL 650#define synaptics_i2c_resume NULL 651#endif 652 653static const struct i2c_device_id synaptics_i2c_id_table[] = { 654 { "synaptics_i2c", 0 }, 655 { }, 656}; 657MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table); 658 659static struct i2c_driver synaptics_i2c_driver = { 660 .driver = { 661 .name = DRIVER_NAME, 662 .owner = THIS_MODULE, 663 }, 664 665 .probe = synaptics_i2c_probe, 666 .remove = __devexit_p(synaptics_i2c_remove), 667 668 .suspend = synaptics_i2c_suspend, 669 .resume = synaptics_i2c_resume, 670 .id_table = synaptics_i2c_id_table, 671}; 672 673static int __init synaptics_i2c_init(void) 674{ 675 return i2c_add_driver(&synaptics_i2c_driver); 676} 677 678static void __exit synaptics_i2c_exit(void) 679{ 680 i2c_del_driver(&synaptics_i2c_driver); 681} 682 683module_init(synaptics_i2c_init); 684module_exit(synaptics_i2c_exit); 685 686MODULE_DESCRIPTION("Synaptics I2C touchpad driver"); 687MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab"); 688MODULE_LICENSE("GPL"); 689