1/* 2 * AD714X CapTouch Programmable Controller driver supporting AD7142/3/7/8/7A 3 * 4 * Copyright 2009-2011 Analog Devices Inc. 5 * 6 * Licensed under the GPL-2 or later. 7 */ 8 9#include <linux/device.h> 10#include <linux/input.h> 11#include <linux/interrupt.h> 12#include <linux/slab.h> 13#include <linux/input/ad714x.h> 14#include <linux/module.h> 15#include "ad714x.h" 16 17#define AD714X_PWR_CTRL 0x0 18#define AD714X_STG_CAL_EN_REG 0x1 19#define AD714X_AMB_COMP_CTRL0_REG 0x2 20#define AD714X_PARTID_REG 0x17 21#define AD7142_PARTID 0xE620 22#define AD7143_PARTID 0xE630 23#define AD7147_PARTID 0x1470 24#define AD7148_PARTID 0x1480 25#define AD714X_STAGECFG_REG 0x80 26#define AD714X_SYSCFG_REG 0x0 27 28#define STG_LOW_INT_EN_REG 0x5 29#define STG_HIGH_INT_EN_REG 0x6 30#define STG_COM_INT_EN_REG 0x7 31#define STG_LOW_INT_STA_REG 0x8 32#define STG_HIGH_INT_STA_REG 0x9 33#define STG_COM_INT_STA_REG 0xA 34 35#define CDC_RESULT_S0 0xB 36#define CDC_RESULT_S1 0xC 37#define CDC_RESULT_S2 0xD 38#define CDC_RESULT_S3 0xE 39#define CDC_RESULT_S4 0xF 40#define CDC_RESULT_S5 0x10 41#define CDC_RESULT_S6 0x11 42#define CDC_RESULT_S7 0x12 43#define CDC_RESULT_S8 0x13 44#define CDC_RESULT_S9 0x14 45#define CDC_RESULT_S10 0x15 46#define CDC_RESULT_S11 0x16 47 48#define STAGE0_AMBIENT 0xF1 49#define STAGE1_AMBIENT 0x115 50#define STAGE2_AMBIENT 0x139 51#define STAGE3_AMBIENT 0x15D 52#define STAGE4_AMBIENT 0x181 53#define STAGE5_AMBIENT 0x1A5 54#define STAGE6_AMBIENT 0x1C9 55#define STAGE7_AMBIENT 0x1ED 56#define STAGE8_AMBIENT 0x211 57#define STAGE9_AMBIENT 0x234 58#define STAGE10_AMBIENT 0x259 59#define STAGE11_AMBIENT 0x27D 60 61#define PER_STAGE_REG_NUM 36 62#define STAGE_CFGREG_NUM 8 63#define SYS_CFGREG_NUM 8 64 65/* 66 * driver information which will be used to maintain the software flow 67 */ 68enum ad714x_device_state { IDLE, JITTER, ACTIVE, SPACE }; 69 70struct ad714x_slider_drv { 71 int highest_stage; 72 int abs_pos; 73 int flt_pos; 74 enum ad714x_device_state state; 75 struct input_dev *input; 76}; 77 78struct ad714x_wheel_drv { 79 int abs_pos; 80 int flt_pos; 81 int pre_highest_stage; 82 int highest_stage; 83 enum ad714x_device_state state; 84 struct input_dev *input; 85}; 86 87struct ad714x_touchpad_drv { 88 int x_highest_stage; 89 int x_flt_pos; 90 int x_abs_pos; 91 int y_highest_stage; 92 int y_flt_pos; 93 int y_abs_pos; 94 int left_ep; 95 int left_ep_val; 96 int right_ep; 97 int right_ep_val; 98 int top_ep; 99 int top_ep_val; 100 int bottom_ep; 101 int bottom_ep_val; 102 enum ad714x_device_state state; 103 struct input_dev *input; 104}; 105 106struct ad714x_button_drv { 107 enum ad714x_device_state state; 108 /* 109 * Unlike slider/wheel/touchpad, all buttons point to 110 * same input_dev instance 111 */ 112 struct input_dev *input; 113}; 114 115struct ad714x_driver_data { 116 struct ad714x_slider_drv *slider; 117 struct ad714x_wheel_drv *wheel; 118 struct ad714x_touchpad_drv *touchpad; 119 struct ad714x_button_drv *button; 120}; 121 122/* 123 * information to integrate all things which will be private data 124 * of spi/i2c device 125 */ 126 127static void ad714x_use_com_int(struct ad714x_chip *ad714x, 128 int start_stage, int end_stage) 129{ 130 unsigned short data; 131 unsigned short mask; 132 133 mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1); 134 135 ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1); 136 data |= 1 << end_stage; 137 ad714x->write(ad714x, STG_COM_INT_EN_REG, data); 138 139 ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1); 140 data &= ~mask; 141 ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data); 142} 143 144static void ad714x_use_thr_int(struct ad714x_chip *ad714x, 145 int start_stage, int end_stage) 146{ 147 unsigned short data; 148 unsigned short mask; 149 150 mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1); 151 152 ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1); 153 data &= ~(1 << end_stage); 154 ad714x->write(ad714x, STG_COM_INT_EN_REG, data); 155 156 ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1); 157 data |= mask; 158 ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data); 159} 160 161static int ad714x_cal_highest_stage(struct ad714x_chip *ad714x, 162 int start_stage, int end_stage) 163{ 164 int max_res = 0; 165 int max_idx = 0; 166 int i; 167 168 for (i = start_stage; i <= end_stage; i++) { 169 if (ad714x->sensor_val[i] > max_res) { 170 max_res = ad714x->sensor_val[i]; 171 max_idx = i; 172 } 173 } 174 175 return max_idx; 176} 177 178static int ad714x_cal_abs_pos(struct ad714x_chip *ad714x, 179 int start_stage, int end_stage, 180 int highest_stage, int max_coord) 181{ 182 int a_param, b_param; 183 184 if (highest_stage == start_stage) { 185 a_param = ad714x->sensor_val[start_stage + 1]; 186 b_param = ad714x->sensor_val[start_stage] + 187 ad714x->sensor_val[start_stage + 1]; 188 } else if (highest_stage == end_stage) { 189 a_param = ad714x->sensor_val[end_stage] * 190 (end_stage - start_stage) + 191 ad714x->sensor_val[end_stage - 1] * 192 (end_stage - start_stage - 1); 193 b_param = ad714x->sensor_val[end_stage] + 194 ad714x->sensor_val[end_stage - 1]; 195 } else { 196 a_param = ad714x->sensor_val[highest_stage] * 197 (highest_stage - start_stage) + 198 ad714x->sensor_val[highest_stage - 1] * 199 (highest_stage - start_stage - 1) + 200 ad714x->sensor_val[highest_stage + 1] * 201 (highest_stage - start_stage + 1); 202 b_param = ad714x->sensor_val[highest_stage] + 203 ad714x->sensor_val[highest_stage - 1] + 204 ad714x->sensor_val[highest_stage + 1]; 205 } 206 207 return (max_coord / (end_stage - start_stage)) * a_param / b_param; 208} 209 210/* 211 * One button can connect to multi positive and negative of CDCs 212 * Multi-buttons can connect to same positive/negative of one CDC 213 */ 214static void ad714x_button_state_machine(struct ad714x_chip *ad714x, int idx) 215{ 216 struct ad714x_button_plat *hw = &ad714x->hw->button[idx]; 217 struct ad714x_button_drv *sw = &ad714x->sw->button[idx]; 218 219 switch (sw->state) { 220 case IDLE: 221 if (((ad714x->h_state & hw->h_mask) == hw->h_mask) && 222 ((ad714x->l_state & hw->l_mask) == hw->l_mask)) { 223 dev_dbg(ad714x->dev, "button %d touched\n", idx); 224 input_report_key(sw->input, hw->keycode, 1); 225 input_sync(sw->input); 226 sw->state = ACTIVE; 227 } 228 break; 229 230 case ACTIVE: 231 if (((ad714x->h_state & hw->h_mask) != hw->h_mask) || 232 ((ad714x->l_state & hw->l_mask) != hw->l_mask)) { 233 dev_dbg(ad714x->dev, "button %d released\n", idx); 234 input_report_key(sw->input, hw->keycode, 0); 235 input_sync(sw->input); 236 sw->state = IDLE; 237 } 238 break; 239 240 default: 241 break; 242 } 243} 244 245/* 246 * The response of a sensor is defined by the absolute number of codes 247 * between the current CDC value and the ambient value. 248 */ 249static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int idx) 250{ 251 struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; 252 int i; 253 254 ad714x->read(ad714x, CDC_RESULT_S0 + hw->start_stage, 255 &ad714x->adc_reg[hw->start_stage], 256 hw->end_stage - hw->start_stage + 1); 257 258 for (i = hw->start_stage; i <= hw->end_stage; i++) { 259 ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, 260 &ad714x->amb_reg[i], 1); 261 262 ad714x->sensor_val[i] = 263 abs(ad714x->adc_reg[i] - ad714x->amb_reg[i]); 264 } 265} 266 267static void ad714x_slider_cal_highest_stage(struct ad714x_chip *ad714x, int idx) 268{ 269 struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; 270 struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; 271 272 sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage, 273 hw->end_stage); 274 275 dev_dbg(ad714x->dev, "slider %d highest_stage:%d\n", idx, 276 sw->highest_stage); 277} 278 279/* 280 * The formulae are very straight forward. It uses the sensor with the 281 * highest response and the 2 adjacent ones. 282 * When Sensor 0 has the highest response, only sensor 0 and sensor 1 283 * are used in the calculations. Similarly when the last sensor has the 284 * highest response, only the last sensor and the second last sensors 285 * are used in the calculations. 286 * 287 * For i= idx_of_peak_Sensor-1 to i= idx_of_peak_Sensor+1 288 * v += Sensor response(i)*i 289 * w += Sensor response(i) 290 * POS=(Number_of_Positions_Wanted/(Number_of_Sensors_Used-1)) *(v/w) 291 */ 292static void ad714x_slider_cal_abs_pos(struct ad714x_chip *ad714x, int idx) 293{ 294 struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; 295 struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; 296 297 sw->abs_pos = ad714x_cal_abs_pos(ad714x, hw->start_stage, hw->end_stage, 298 sw->highest_stage, hw->max_coord); 299 300 dev_dbg(ad714x->dev, "slider %d absolute position:%d\n", idx, 301 sw->abs_pos); 302} 303 304/* 305 * To minimise the Impact of the noise on the algorithm, ADI developed a 306 * routine that filters the CDC results after they have been read by the 307 * host processor. 308 * The filter used is an Infinite Input Response(IIR) filter implemented 309 * in firmware and attenuates the noise on the CDC results after they've 310 * been read by the host processor. 311 * Filtered_CDC_result = (Filtered_CDC_result * (10 - Coefficient) + 312 * Latest_CDC_result * Coefficient)/10 313 */ 314static void ad714x_slider_cal_flt_pos(struct ad714x_chip *ad714x, int idx) 315{ 316 struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; 317 318 sw->flt_pos = (sw->flt_pos * (10 - 4) + 319 sw->abs_pos * 4)/10; 320 321 dev_dbg(ad714x->dev, "slider %d filter position:%d\n", idx, 322 sw->flt_pos); 323} 324 325static void ad714x_slider_use_com_int(struct ad714x_chip *ad714x, int idx) 326{ 327 struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; 328 329 ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage); 330} 331 332static void ad714x_slider_use_thr_int(struct ad714x_chip *ad714x, int idx) 333{ 334 struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; 335 336 ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage); 337} 338 339static void ad714x_slider_state_machine(struct ad714x_chip *ad714x, int idx) 340{ 341 struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; 342 struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; 343 unsigned short h_state, c_state; 344 unsigned short mask; 345 346 mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1); 347 348 h_state = ad714x->h_state & mask; 349 c_state = ad714x->c_state & mask; 350 351 switch (sw->state) { 352 case IDLE: 353 if (h_state) { 354 sw->state = JITTER; 355 /* In End of Conversion interrupt mode, the AD714X 356 * continuously generates hardware interrupts. 357 */ 358 ad714x_slider_use_com_int(ad714x, idx); 359 dev_dbg(ad714x->dev, "slider %d touched\n", idx); 360 } 361 break; 362 363 case JITTER: 364 if (c_state == mask) { 365 ad714x_slider_cal_sensor_val(ad714x, idx); 366 ad714x_slider_cal_highest_stage(ad714x, idx); 367 ad714x_slider_cal_abs_pos(ad714x, idx); 368 sw->flt_pos = sw->abs_pos; 369 sw->state = ACTIVE; 370 } 371 break; 372 373 case ACTIVE: 374 if (c_state == mask) { 375 if (h_state) { 376 ad714x_slider_cal_sensor_val(ad714x, idx); 377 ad714x_slider_cal_highest_stage(ad714x, idx); 378 ad714x_slider_cal_abs_pos(ad714x, idx); 379 ad714x_slider_cal_flt_pos(ad714x, idx); 380 input_report_abs(sw->input, ABS_X, sw->flt_pos); 381 input_report_key(sw->input, BTN_TOUCH, 1); 382 } else { 383 /* When the user lifts off the sensor, configure 384 * the AD714X back to threshold interrupt mode. 385 */ 386 ad714x_slider_use_thr_int(ad714x, idx); 387 sw->state = IDLE; 388 input_report_key(sw->input, BTN_TOUCH, 0); 389 dev_dbg(ad714x->dev, "slider %d released\n", 390 idx); 391 } 392 input_sync(sw->input); 393 } 394 break; 395 396 default: 397 break; 398 } 399} 400 401/* 402 * When the scroll wheel is activated, we compute the absolute position based 403 * on the sensor values. To calculate the position, we first determine the 404 * sensor that has the greatest response among the 8 sensors that constitutes 405 * the scrollwheel. Then we determined the 2 sensors on either sides of the 406 * sensor with the highest response and we apply weights to these sensors. 407 */ 408static void ad714x_wheel_cal_highest_stage(struct ad714x_chip *ad714x, int idx) 409{ 410 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 411 struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; 412 413 sw->pre_highest_stage = sw->highest_stage; 414 sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage, 415 hw->end_stage); 416 417 dev_dbg(ad714x->dev, "wheel %d highest_stage:%d\n", idx, 418 sw->highest_stage); 419} 420 421static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int idx) 422{ 423 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 424 int i; 425 426 ad714x->read(ad714x, CDC_RESULT_S0 + hw->start_stage, 427 &ad714x->adc_reg[hw->start_stage], 428 hw->end_stage - hw->start_stage + 1); 429 430 for (i = hw->start_stage; i <= hw->end_stage; i++) { 431 ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, 432 &ad714x->amb_reg[i], 1); 433 if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) 434 ad714x->sensor_val[i] = 435 ad714x->adc_reg[i] - ad714x->amb_reg[i]; 436 else 437 ad714x->sensor_val[i] = 0; 438 } 439} 440 441/* 442 * When the scroll wheel is activated, we compute the absolute position based 443 * on the sensor values. To calculate the position, we first determine the 444 * sensor that has the greatest response among the sensors that constitutes 445 * the scrollwheel. Then we determined the sensors on either sides of the 446 * sensor with the highest response and we apply weights to these sensors. The 447 * result of this computation gives us the mean value. 448 */ 449 450static void ad714x_wheel_cal_abs_pos(struct ad714x_chip *ad714x, int idx) 451{ 452 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 453 struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; 454 int stage_num = hw->end_stage - hw->start_stage + 1; 455 int first_before, highest, first_after; 456 int a_param, b_param; 457 458 first_before = (sw->highest_stage + stage_num - 1) % stage_num; 459 highest = sw->highest_stage; 460 first_after = (sw->highest_stage + stage_num + 1) % stage_num; 461 462 a_param = ad714x->sensor_val[highest] * 463 (highest - hw->start_stage) + 464 ad714x->sensor_val[first_before] * 465 (highest - hw->start_stage - 1) + 466 ad714x->sensor_val[first_after] * 467 (highest - hw->start_stage + 1); 468 b_param = ad714x->sensor_val[highest] + 469 ad714x->sensor_val[first_before] + 470 ad714x->sensor_val[first_after]; 471 472 sw->abs_pos = ((hw->max_coord / (hw->end_stage - hw->start_stage)) * 473 a_param) / b_param; 474 475 if (sw->abs_pos > hw->max_coord) 476 sw->abs_pos = hw->max_coord; 477 else if (sw->abs_pos < 0) 478 sw->abs_pos = 0; 479} 480 481static void ad714x_wheel_cal_flt_pos(struct ad714x_chip *ad714x, int idx) 482{ 483 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 484 struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; 485 if (((sw->pre_highest_stage == hw->end_stage) && 486 (sw->highest_stage == hw->start_stage)) || 487 ((sw->pre_highest_stage == hw->start_stage) && 488 (sw->highest_stage == hw->end_stage))) 489 sw->flt_pos = sw->abs_pos; 490 else 491 sw->flt_pos = ((sw->flt_pos * 30) + (sw->abs_pos * 71)) / 100; 492 493 if (sw->flt_pos > hw->max_coord) 494 sw->flt_pos = hw->max_coord; 495} 496 497static void ad714x_wheel_use_com_int(struct ad714x_chip *ad714x, int idx) 498{ 499 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 500 501 ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage); 502} 503 504static void ad714x_wheel_use_thr_int(struct ad714x_chip *ad714x, int idx) 505{ 506 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 507 508 ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage); 509} 510 511static void ad714x_wheel_state_machine(struct ad714x_chip *ad714x, int idx) 512{ 513 struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; 514 struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; 515 unsigned short h_state, c_state; 516 unsigned short mask; 517 518 mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1); 519 520 h_state = ad714x->h_state & mask; 521 c_state = ad714x->c_state & mask; 522 523 switch (sw->state) { 524 case IDLE: 525 if (h_state) { 526 sw->state = JITTER; 527 /* In End of Conversion interrupt mode, the AD714X 528 * continuously generates hardware interrupts. 529 */ 530 ad714x_wheel_use_com_int(ad714x, idx); 531 dev_dbg(ad714x->dev, "wheel %d touched\n", idx); 532 } 533 break; 534 535 case JITTER: 536 if (c_state == mask) { 537 ad714x_wheel_cal_sensor_val(ad714x, idx); 538 ad714x_wheel_cal_highest_stage(ad714x, idx); 539 ad714x_wheel_cal_abs_pos(ad714x, idx); 540 sw->flt_pos = sw->abs_pos; 541 sw->state = ACTIVE; 542 } 543 break; 544 545 case ACTIVE: 546 if (c_state == mask) { 547 if (h_state) { 548 ad714x_wheel_cal_sensor_val(ad714x, idx); 549 ad714x_wheel_cal_highest_stage(ad714x, idx); 550 ad714x_wheel_cal_abs_pos(ad714x, idx); 551 ad714x_wheel_cal_flt_pos(ad714x, idx); 552 input_report_abs(sw->input, ABS_WHEEL, 553 sw->flt_pos); 554 input_report_key(sw->input, BTN_TOUCH, 1); 555 } else { 556 /* When the user lifts off the sensor, configure 557 * the AD714X back to threshold interrupt mode. 558 */ 559 ad714x_wheel_use_thr_int(ad714x, idx); 560 sw->state = IDLE; 561 input_report_key(sw->input, BTN_TOUCH, 0); 562 563 dev_dbg(ad714x->dev, "wheel %d released\n", 564 idx); 565 } 566 input_sync(sw->input); 567 } 568 break; 569 570 default: 571 break; 572 } 573} 574 575static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx) 576{ 577 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 578 int i; 579 580 ad714x->read(ad714x, CDC_RESULT_S0 + hw->x_start_stage, 581 &ad714x->adc_reg[hw->x_start_stage], 582 hw->x_end_stage - hw->x_start_stage + 1); 583 584 for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) { 585 ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, 586 &ad714x->amb_reg[i], 1); 587 if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) 588 ad714x->sensor_val[i] = 589 ad714x->adc_reg[i] - ad714x->amb_reg[i]; 590 else 591 ad714x->sensor_val[i] = 0; 592 } 593} 594 595static void touchpad_cal_highest_stage(struct ad714x_chip *ad714x, int idx) 596{ 597 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 598 struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; 599 600 sw->x_highest_stage = ad714x_cal_highest_stage(ad714x, 601 hw->x_start_stage, hw->x_end_stage); 602 sw->y_highest_stage = ad714x_cal_highest_stage(ad714x, 603 hw->y_start_stage, hw->y_end_stage); 604 605 dev_dbg(ad714x->dev, 606 "touchpad %d x_highest_stage:%d, y_highest_stage:%d\n", 607 idx, sw->x_highest_stage, sw->y_highest_stage); 608} 609 610/* 611 * If 2 fingers are touching the sensor then 2 peaks can be observed in the 612 * distribution. 613 * The arithmetic doesn't support to get absolute coordinates for multi-touch 614 * yet. 615 */ 616static int touchpad_check_second_peak(struct ad714x_chip *ad714x, int idx) 617{ 618 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 619 struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; 620 int i; 621 622 for (i = hw->x_start_stage; i < sw->x_highest_stage; i++) { 623 if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1]) 624 > (ad714x->sensor_val[i + 1] / 10)) 625 return 1; 626 } 627 628 for (i = sw->x_highest_stage; i < hw->x_end_stage; i++) { 629 if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i]) 630 > (ad714x->sensor_val[i] / 10)) 631 return 1; 632 } 633 634 for (i = hw->y_start_stage; i < sw->y_highest_stage; i++) { 635 if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1]) 636 > (ad714x->sensor_val[i + 1] / 10)) 637 return 1; 638 } 639 640 for (i = sw->y_highest_stage; i < hw->y_end_stage; i++) { 641 if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i]) 642 > (ad714x->sensor_val[i] / 10)) 643 return 1; 644 } 645 646 return 0; 647} 648 649/* 650 * If only one finger is used to activate the touch pad then only 1 peak will be 651 * registered in the distribution. This peak and the 2 adjacent sensors will be 652 * used in the calculation of the absolute position. This will prevent hand 653 * shadows to affect the absolute position calculation. 654 */ 655static void touchpad_cal_abs_pos(struct ad714x_chip *ad714x, int idx) 656{ 657 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 658 struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; 659 660 sw->x_abs_pos = ad714x_cal_abs_pos(ad714x, hw->x_start_stage, 661 hw->x_end_stage, sw->x_highest_stage, hw->x_max_coord); 662 sw->y_abs_pos = ad714x_cal_abs_pos(ad714x, hw->y_start_stage, 663 hw->y_end_stage, sw->y_highest_stage, hw->y_max_coord); 664 665 dev_dbg(ad714x->dev, "touchpad %d absolute position:(%d, %d)\n", idx, 666 sw->x_abs_pos, sw->y_abs_pos); 667} 668 669static void touchpad_cal_flt_pos(struct ad714x_chip *ad714x, int idx) 670{ 671 struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; 672 673 sw->x_flt_pos = (sw->x_flt_pos * (10 - 4) + 674 sw->x_abs_pos * 4)/10; 675 sw->y_flt_pos = (sw->y_flt_pos * (10 - 4) + 676 sw->y_abs_pos * 4)/10; 677 678 dev_dbg(ad714x->dev, "touchpad %d filter position:(%d, %d)\n", 679 idx, sw->x_flt_pos, sw->y_flt_pos); 680} 681 682/* 683 * To prevent distortion from showing in the absolute position, it is 684 * necessary to detect the end points. When endpoints are detected, the 685 * driver stops updating the status variables with absolute positions. 686 * End points are detected on the 4 edges of the touchpad sensor. The 687 * method to detect them is the same for all 4. 688 * To detect the end points, the firmware computes the difference in 689 * percent between the sensor on the edge and the adjacent one. The 690 * difference is calculated in percent in order to make the end point 691 * detection independent of the pressure. 692 */ 693 694#define LEFT_END_POINT_DETECTION_LEVEL 550 695#define RIGHT_END_POINT_DETECTION_LEVEL 750 696#define LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL 850 697#define TOP_END_POINT_DETECTION_LEVEL 550 698#define BOTTOM_END_POINT_DETECTION_LEVEL 950 699#define TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL 700 700static int touchpad_check_endpoint(struct ad714x_chip *ad714x, int idx) 701{ 702 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 703 struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; 704 int percent_sensor_diff; 705 706 /* left endpoint detect */ 707 percent_sensor_diff = (ad714x->sensor_val[hw->x_start_stage] - 708 ad714x->sensor_val[hw->x_start_stage + 1]) * 100 / 709 ad714x->sensor_val[hw->x_start_stage + 1]; 710 if (!sw->left_ep) { 711 if (percent_sensor_diff >= LEFT_END_POINT_DETECTION_LEVEL) { 712 sw->left_ep = 1; 713 sw->left_ep_val = 714 ad714x->sensor_val[hw->x_start_stage + 1]; 715 } 716 } else { 717 if ((percent_sensor_diff < LEFT_END_POINT_DETECTION_LEVEL) && 718 (ad714x->sensor_val[hw->x_start_stage + 1] > 719 LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->left_ep_val)) 720 sw->left_ep = 0; 721 } 722 723 /* right endpoint detect */ 724 percent_sensor_diff = (ad714x->sensor_val[hw->x_end_stage] - 725 ad714x->sensor_val[hw->x_end_stage - 1]) * 100 / 726 ad714x->sensor_val[hw->x_end_stage - 1]; 727 if (!sw->right_ep) { 728 if (percent_sensor_diff >= RIGHT_END_POINT_DETECTION_LEVEL) { 729 sw->right_ep = 1; 730 sw->right_ep_val = 731 ad714x->sensor_val[hw->x_end_stage - 1]; 732 } 733 } else { 734 if ((percent_sensor_diff < RIGHT_END_POINT_DETECTION_LEVEL) && 735 (ad714x->sensor_val[hw->x_end_stage - 1] > 736 LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->right_ep_val)) 737 sw->right_ep = 0; 738 } 739 740 /* top endpoint detect */ 741 percent_sensor_diff = (ad714x->sensor_val[hw->y_start_stage] - 742 ad714x->sensor_val[hw->y_start_stage + 1]) * 100 / 743 ad714x->sensor_val[hw->y_start_stage + 1]; 744 if (!sw->top_ep) { 745 if (percent_sensor_diff >= TOP_END_POINT_DETECTION_LEVEL) { 746 sw->top_ep = 1; 747 sw->top_ep_val = 748 ad714x->sensor_val[hw->y_start_stage + 1]; 749 } 750 } else { 751 if ((percent_sensor_diff < TOP_END_POINT_DETECTION_LEVEL) && 752 (ad714x->sensor_val[hw->y_start_stage + 1] > 753 TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->top_ep_val)) 754 sw->top_ep = 0; 755 } 756 757 /* bottom endpoint detect */ 758 percent_sensor_diff = (ad714x->sensor_val[hw->y_end_stage] - 759 ad714x->sensor_val[hw->y_end_stage - 1]) * 100 / 760 ad714x->sensor_val[hw->y_end_stage - 1]; 761 if (!sw->bottom_ep) { 762 if (percent_sensor_diff >= BOTTOM_END_POINT_DETECTION_LEVEL) { 763 sw->bottom_ep = 1; 764 sw->bottom_ep_val = 765 ad714x->sensor_val[hw->y_end_stage - 1]; 766 } 767 } else { 768 if ((percent_sensor_diff < BOTTOM_END_POINT_DETECTION_LEVEL) && 769 (ad714x->sensor_val[hw->y_end_stage - 1] > 770 TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->bottom_ep_val)) 771 sw->bottom_ep = 0; 772 } 773 774 return sw->left_ep || sw->right_ep || sw->top_ep || sw->bottom_ep; 775} 776 777static void touchpad_use_com_int(struct ad714x_chip *ad714x, int idx) 778{ 779 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 780 781 ad714x_use_com_int(ad714x, hw->x_start_stage, hw->x_end_stage); 782} 783 784static void touchpad_use_thr_int(struct ad714x_chip *ad714x, int idx) 785{ 786 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 787 788 ad714x_use_thr_int(ad714x, hw->x_start_stage, hw->x_end_stage); 789 ad714x_use_thr_int(ad714x, hw->y_start_stage, hw->y_end_stage); 790} 791 792static void ad714x_touchpad_state_machine(struct ad714x_chip *ad714x, int idx) 793{ 794 struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; 795 struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; 796 unsigned short h_state, c_state; 797 unsigned short mask; 798 799 mask = (((1 << (hw->x_end_stage + 1)) - 1) - 800 ((1 << hw->x_start_stage) - 1)) + 801 (((1 << (hw->y_end_stage + 1)) - 1) - 802 ((1 << hw->y_start_stage) - 1)); 803 804 h_state = ad714x->h_state & mask; 805 c_state = ad714x->c_state & mask; 806 807 switch (sw->state) { 808 case IDLE: 809 if (h_state) { 810 sw->state = JITTER; 811 /* In End of Conversion interrupt mode, the AD714X 812 * continuously generates hardware interrupts. 813 */ 814 touchpad_use_com_int(ad714x, idx); 815 dev_dbg(ad714x->dev, "touchpad %d touched\n", idx); 816 } 817 break; 818 819 case JITTER: 820 if (c_state == mask) { 821 touchpad_cal_sensor_val(ad714x, idx); 822 touchpad_cal_highest_stage(ad714x, idx); 823 if ((!touchpad_check_second_peak(ad714x, idx)) && 824 (!touchpad_check_endpoint(ad714x, idx))) { 825 dev_dbg(ad714x->dev, 826 "touchpad%d, 2 fingers or endpoint\n", 827 idx); 828 touchpad_cal_abs_pos(ad714x, idx); 829 sw->x_flt_pos = sw->x_abs_pos; 830 sw->y_flt_pos = sw->y_abs_pos; 831 sw->state = ACTIVE; 832 } 833 } 834 break; 835 836 case ACTIVE: 837 if (c_state == mask) { 838 if (h_state) { 839 touchpad_cal_sensor_val(ad714x, idx); 840 touchpad_cal_highest_stage(ad714x, idx); 841 if ((!touchpad_check_second_peak(ad714x, idx)) 842 && (!touchpad_check_endpoint(ad714x, idx))) { 843 touchpad_cal_abs_pos(ad714x, idx); 844 touchpad_cal_flt_pos(ad714x, idx); 845 input_report_abs(sw->input, ABS_X, 846 sw->x_flt_pos); 847 input_report_abs(sw->input, ABS_Y, 848 sw->y_flt_pos); 849 input_report_key(sw->input, BTN_TOUCH, 850 1); 851 } 852 } else { 853 /* When the user lifts off the sensor, configure 854 * the AD714X back to threshold interrupt mode. 855 */ 856 touchpad_use_thr_int(ad714x, idx); 857 sw->state = IDLE; 858 input_report_key(sw->input, BTN_TOUCH, 0); 859 dev_dbg(ad714x->dev, "touchpad %d released\n", 860 idx); 861 } 862 input_sync(sw->input); 863 } 864 break; 865 866 default: 867 break; 868 } 869} 870 871static int ad714x_hw_detect(struct ad714x_chip *ad714x) 872{ 873 unsigned short data; 874 875 ad714x->read(ad714x, AD714X_PARTID_REG, &data, 1); 876 switch (data & 0xFFF0) { 877 case AD7142_PARTID: 878 ad714x->product = 0x7142; 879 ad714x->version = data & 0xF; 880 dev_info(ad714x->dev, "found AD7142 captouch, rev:%d\n", 881 ad714x->version); 882 return 0; 883 884 case AD7143_PARTID: 885 ad714x->product = 0x7143; 886 ad714x->version = data & 0xF; 887 dev_info(ad714x->dev, "found AD7143 captouch, rev:%d\n", 888 ad714x->version); 889 return 0; 890 891 case AD7147_PARTID: 892 ad714x->product = 0x7147; 893 ad714x->version = data & 0xF; 894 dev_info(ad714x->dev, "found AD7147(A) captouch, rev:%d\n", 895 ad714x->version); 896 return 0; 897 898 case AD7148_PARTID: 899 ad714x->product = 0x7148; 900 ad714x->version = data & 0xF; 901 dev_info(ad714x->dev, "found AD7148 captouch, rev:%d\n", 902 ad714x->version); 903 return 0; 904 905 default: 906 dev_err(ad714x->dev, 907 "fail to detect AD714X captouch, read ID is %04x\n", 908 data); 909 return -ENODEV; 910 } 911} 912 913static void ad714x_hw_init(struct ad714x_chip *ad714x) 914{ 915 int i, j; 916 unsigned short reg_base; 917 unsigned short data; 918 919 /* configuration CDC and interrupts */ 920 921 for (i = 0; i < STAGE_NUM; i++) { 922 reg_base = AD714X_STAGECFG_REG + i * STAGE_CFGREG_NUM; 923 for (j = 0; j < STAGE_CFGREG_NUM; j++) 924 ad714x->write(ad714x, reg_base + j, 925 ad714x->hw->stage_cfg_reg[i][j]); 926 } 927 928 for (i = 0; i < SYS_CFGREG_NUM; i++) 929 ad714x->write(ad714x, AD714X_SYSCFG_REG + i, 930 ad714x->hw->sys_cfg_reg[i]); 931 for (i = 0; i < SYS_CFGREG_NUM; i++) 932 ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data, 1); 933 934 ad714x->write(ad714x, AD714X_STG_CAL_EN_REG, 0xFFF); 935 936 /* clear all interrupts */ 937 ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3); 938} 939 940static irqreturn_t ad714x_interrupt_thread(int irq, void *data) 941{ 942 struct ad714x_chip *ad714x = data; 943 int i; 944 945 mutex_lock(&ad714x->mutex); 946 947 ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3); 948 949 for (i = 0; i < ad714x->hw->button_num; i++) 950 ad714x_button_state_machine(ad714x, i); 951 for (i = 0; i < ad714x->hw->slider_num; i++) 952 ad714x_slider_state_machine(ad714x, i); 953 for (i = 0; i < ad714x->hw->wheel_num; i++) 954 ad714x_wheel_state_machine(ad714x, i); 955 for (i = 0; i < ad714x->hw->touchpad_num; i++) 956 ad714x_touchpad_state_machine(ad714x, i); 957 958 mutex_unlock(&ad714x->mutex); 959 960 return IRQ_HANDLED; 961} 962 963#define MAX_DEVICE_NUM 8 964struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq, 965 ad714x_read_t read, ad714x_write_t write) 966{ 967 int i, alloc_idx; 968 int error; 969 struct input_dev *input[MAX_DEVICE_NUM]; 970 971 struct ad714x_platform_data *plat_data = dev_get_platdata(dev); 972 struct ad714x_chip *ad714x; 973 void *drv_mem; 974 unsigned long irqflags; 975 976 struct ad714x_button_drv *bt_drv; 977 struct ad714x_slider_drv *sd_drv; 978 struct ad714x_wheel_drv *wl_drv; 979 struct ad714x_touchpad_drv *tp_drv; 980 981 982 if (irq <= 0) { 983 dev_err(dev, "IRQ not configured!\n"); 984 error = -EINVAL; 985 goto err_out; 986 } 987 988 if (dev_get_platdata(dev) == NULL) { 989 dev_err(dev, "platform data for ad714x doesn't exist\n"); 990 error = -EINVAL; 991 goto err_out; 992 } 993 994 ad714x = kzalloc(sizeof(*ad714x) + sizeof(*ad714x->sw) + 995 sizeof(*sd_drv) * plat_data->slider_num + 996 sizeof(*wl_drv) * plat_data->wheel_num + 997 sizeof(*tp_drv) * plat_data->touchpad_num + 998 sizeof(*bt_drv) * plat_data->button_num, GFP_KERNEL); 999 if (!ad714x) { 1000 error = -ENOMEM; 1001 goto err_out; 1002 } 1003 1004 ad714x->hw = plat_data; 1005 1006 drv_mem = ad714x + 1; 1007 ad714x->sw = drv_mem; 1008 drv_mem += sizeof(*ad714x->sw); 1009 ad714x->sw->slider = sd_drv = drv_mem; 1010 drv_mem += sizeof(*sd_drv) * ad714x->hw->slider_num; 1011 ad714x->sw->wheel = wl_drv = drv_mem; 1012 drv_mem += sizeof(*wl_drv) * ad714x->hw->wheel_num; 1013 ad714x->sw->touchpad = tp_drv = drv_mem; 1014 drv_mem += sizeof(*tp_drv) * ad714x->hw->touchpad_num; 1015 ad714x->sw->button = bt_drv = drv_mem; 1016 drv_mem += sizeof(*bt_drv) * ad714x->hw->button_num; 1017 1018 ad714x->read = read; 1019 ad714x->write = write; 1020 ad714x->irq = irq; 1021 ad714x->dev = dev; 1022 1023 error = ad714x_hw_detect(ad714x); 1024 if (error) 1025 goto err_free_mem; 1026 1027 /* initialize and request sw/hw resources */ 1028 1029 ad714x_hw_init(ad714x); 1030 mutex_init(&ad714x->mutex); 1031 1032 /* 1033 * Allocate and register AD714X input device 1034 */ 1035 alloc_idx = 0; 1036 1037 /* a slider uses one input_dev instance */ 1038 if (ad714x->hw->slider_num > 0) { 1039 struct ad714x_slider_plat *sd_plat = ad714x->hw->slider; 1040 1041 for (i = 0; i < ad714x->hw->slider_num; i++) { 1042 sd_drv[i].input = input[alloc_idx] = input_allocate_device(); 1043 if (!input[alloc_idx]) { 1044 error = -ENOMEM; 1045 goto err_free_dev; 1046 } 1047 1048 __set_bit(EV_ABS, input[alloc_idx]->evbit); 1049 __set_bit(EV_KEY, input[alloc_idx]->evbit); 1050 __set_bit(ABS_X, input[alloc_idx]->absbit); 1051 __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); 1052 input_set_abs_params(input[alloc_idx], 1053 ABS_X, 0, sd_plat->max_coord, 0, 0); 1054 1055 input[alloc_idx]->id.bustype = bus_type; 1056 input[alloc_idx]->id.product = ad714x->product; 1057 input[alloc_idx]->id.version = ad714x->version; 1058 input[alloc_idx]->name = "ad714x_captouch_slider"; 1059 input[alloc_idx]->dev.parent = dev; 1060 1061 error = input_register_device(input[alloc_idx]); 1062 if (error) 1063 goto err_free_dev; 1064 1065 alloc_idx++; 1066 } 1067 } 1068 1069 /* a wheel uses one input_dev instance */ 1070 if (ad714x->hw->wheel_num > 0) { 1071 struct ad714x_wheel_plat *wl_plat = ad714x->hw->wheel; 1072 1073 for (i = 0; i < ad714x->hw->wheel_num; i++) { 1074 wl_drv[i].input = input[alloc_idx] = input_allocate_device(); 1075 if (!input[alloc_idx]) { 1076 error = -ENOMEM; 1077 goto err_free_dev; 1078 } 1079 1080 __set_bit(EV_KEY, input[alloc_idx]->evbit); 1081 __set_bit(EV_ABS, input[alloc_idx]->evbit); 1082 __set_bit(ABS_WHEEL, input[alloc_idx]->absbit); 1083 __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); 1084 input_set_abs_params(input[alloc_idx], 1085 ABS_WHEEL, 0, wl_plat->max_coord, 0, 0); 1086 1087 input[alloc_idx]->id.bustype = bus_type; 1088 input[alloc_idx]->id.product = ad714x->product; 1089 input[alloc_idx]->id.version = ad714x->version; 1090 input[alloc_idx]->name = "ad714x_captouch_wheel"; 1091 input[alloc_idx]->dev.parent = dev; 1092 1093 error = input_register_device(input[alloc_idx]); 1094 if (error) 1095 goto err_free_dev; 1096 1097 alloc_idx++; 1098 } 1099 } 1100 1101 /* a touchpad uses one input_dev instance */ 1102 if (ad714x->hw->touchpad_num > 0) { 1103 struct ad714x_touchpad_plat *tp_plat = ad714x->hw->touchpad; 1104 1105 for (i = 0; i < ad714x->hw->touchpad_num; i++) { 1106 tp_drv[i].input = input[alloc_idx] = input_allocate_device(); 1107 if (!input[alloc_idx]) { 1108 error = -ENOMEM; 1109 goto err_free_dev; 1110 } 1111 1112 __set_bit(EV_ABS, input[alloc_idx]->evbit); 1113 __set_bit(EV_KEY, input[alloc_idx]->evbit); 1114 __set_bit(ABS_X, input[alloc_idx]->absbit); 1115 __set_bit(ABS_Y, input[alloc_idx]->absbit); 1116 __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); 1117 input_set_abs_params(input[alloc_idx], 1118 ABS_X, 0, tp_plat->x_max_coord, 0, 0); 1119 input_set_abs_params(input[alloc_idx], 1120 ABS_Y, 0, tp_plat->y_max_coord, 0, 0); 1121 1122 input[alloc_idx]->id.bustype = bus_type; 1123 input[alloc_idx]->id.product = ad714x->product; 1124 input[alloc_idx]->id.version = ad714x->version; 1125 input[alloc_idx]->name = "ad714x_captouch_pad"; 1126 input[alloc_idx]->dev.parent = dev; 1127 1128 error = input_register_device(input[alloc_idx]); 1129 if (error) 1130 goto err_free_dev; 1131 1132 alloc_idx++; 1133 } 1134 } 1135 1136 /* all buttons use one input node */ 1137 if (ad714x->hw->button_num > 0) { 1138 struct ad714x_button_plat *bt_plat = ad714x->hw->button; 1139 1140 input[alloc_idx] = input_allocate_device(); 1141 if (!input[alloc_idx]) { 1142 error = -ENOMEM; 1143 goto err_free_dev; 1144 } 1145 1146 __set_bit(EV_KEY, input[alloc_idx]->evbit); 1147 for (i = 0; i < ad714x->hw->button_num; i++) { 1148 bt_drv[i].input = input[alloc_idx]; 1149 __set_bit(bt_plat[i].keycode, input[alloc_idx]->keybit); 1150 } 1151 1152 input[alloc_idx]->id.bustype = bus_type; 1153 input[alloc_idx]->id.product = ad714x->product; 1154 input[alloc_idx]->id.version = ad714x->version; 1155 input[alloc_idx]->name = "ad714x_captouch_button"; 1156 input[alloc_idx]->dev.parent = dev; 1157 1158 error = input_register_device(input[alloc_idx]); 1159 if (error) 1160 goto err_free_dev; 1161 1162 alloc_idx++; 1163 } 1164 1165 irqflags = plat_data->irqflags ?: IRQF_TRIGGER_FALLING; 1166 irqflags |= IRQF_ONESHOT; 1167 1168 error = request_threaded_irq(ad714x->irq, NULL, ad714x_interrupt_thread, 1169 irqflags, "ad714x_captouch", ad714x); 1170 if (error) { 1171 dev_err(dev, "can't allocate irq %d\n", ad714x->irq); 1172 goto err_unreg_dev; 1173 } 1174 1175 return ad714x; 1176 1177 err_free_dev: 1178 dev_err(dev, "failed to setup AD714x input device %i\n", alloc_idx); 1179 input_free_device(input[alloc_idx]); 1180 err_unreg_dev: 1181 while (--alloc_idx >= 0) 1182 input_unregister_device(input[alloc_idx]); 1183 err_free_mem: 1184 kfree(ad714x); 1185 err_out: 1186 return ERR_PTR(error); 1187} 1188EXPORT_SYMBOL(ad714x_probe); 1189 1190void ad714x_remove(struct ad714x_chip *ad714x) 1191{ 1192 struct ad714x_platform_data *hw = ad714x->hw; 1193 struct ad714x_driver_data *sw = ad714x->sw; 1194 int i; 1195 1196 free_irq(ad714x->irq, ad714x); 1197 1198 /* unregister and free all input devices */ 1199 1200 for (i = 0; i < hw->slider_num; i++) 1201 input_unregister_device(sw->slider[i].input); 1202 1203 for (i = 0; i < hw->wheel_num; i++) 1204 input_unregister_device(sw->wheel[i].input); 1205 1206 for (i = 0; i < hw->touchpad_num; i++) 1207 input_unregister_device(sw->touchpad[i].input); 1208 1209 if (hw->button_num) 1210 input_unregister_device(sw->button[0].input); 1211 1212 kfree(ad714x); 1213} 1214EXPORT_SYMBOL(ad714x_remove); 1215 1216#ifdef CONFIG_PM 1217int ad714x_disable(struct ad714x_chip *ad714x) 1218{ 1219 unsigned short data; 1220 1221 dev_dbg(ad714x->dev, "%s enter\n", __func__); 1222 1223 mutex_lock(&ad714x->mutex); 1224 1225 data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3; 1226 ad714x->write(ad714x, AD714X_PWR_CTRL, data); 1227 1228 mutex_unlock(&ad714x->mutex); 1229 1230 return 0; 1231} 1232EXPORT_SYMBOL(ad714x_disable); 1233 1234int ad714x_enable(struct ad714x_chip *ad714x) 1235{ 1236 dev_dbg(ad714x->dev, "%s enter\n", __func__); 1237 1238 mutex_lock(&ad714x->mutex); 1239 1240 /* resume to non-shutdown mode */ 1241 1242 ad714x->write(ad714x, AD714X_PWR_CTRL, 1243 ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]); 1244 1245 /* make sure the interrupt output line is not low level after resume, 1246 * otherwise we will get no chance to enter falling-edge irq again 1247 */ 1248 1249 ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3); 1250 1251 mutex_unlock(&ad714x->mutex); 1252 1253 return 0; 1254} 1255EXPORT_SYMBOL(ad714x_enable); 1256#endif 1257 1258MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver"); 1259MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 1260MODULE_LICENSE("GPL"); 1261