Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1 | /* |
Barry Song | 6c04d7b | 2010-03-21 23:23:29 -0700 | [diff] [blame] | 2 | * AD714X CapTouch Programmable Controller driver supporting AD7142/3/7/8/7A |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright 2009 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2 or later. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/device.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/input.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/input/ad714x.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 |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 21 | #define AD7142_PARTID 0xE620 |
Barry Song | 6c04d7b | 2010-03-21 23:23:29 -0700 | [diff] [blame] | 22 | #define AD7143_PARTID 0xE630 |
| 23 | #define AD7147_PARTID 0x1470 |
| 24 | #define AD7148_PARTID 0x1480 |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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_NUM 12 |
| 63 | #define STAGE_CFGREG_NUM 8 |
| 64 | #define SYS_CFGREG_NUM 8 |
| 65 | |
| 66 | /* |
| 67 | * driver information which will be used to maintain the software flow |
| 68 | */ |
| 69 | enum ad714x_device_state { IDLE, JITTER, ACTIVE, SPACE }; |
| 70 | |
| 71 | struct ad714x_slider_drv { |
| 72 | int highest_stage; |
| 73 | int abs_pos; |
| 74 | int flt_pos; |
| 75 | enum ad714x_device_state state; |
| 76 | struct input_dev *input; |
| 77 | }; |
| 78 | |
| 79 | struct ad714x_wheel_drv { |
| 80 | int abs_pos; |
| 81 | int flt_pos; |
| 82 | int pre_mean_value; |
| 83 | int pre_highest_stage; |
| 84 | int pre_mean_value_no_offset; |
| 85 | int mean_value; |
| 86 | int mean_value_no_offset; |
| 87 | int pos_offset; |
| 88 | int pos_ratio; |
| 89 | int highest_stage; |
| 90 | enum ad714x_device_state state; |
| 91 | struct input_dev *input; |
| 92 | }; |
| 93 | |
| 94 | struct ad714x_touchpad_drv { |
| 95 | int x_highest_stage; |
| 96 | int x_flt_pos; |
| 97 | int x_abs_pos; |
| 98 | int y_highest_stage; |
| 99 | int y_flt_pos; |
| 100 | int y_abs_pos; |
| 101 | int left_ep; |
| 102 | int left_ep_val; |
| 103 | int right_ep; |
| 104 | int right_ep_val; |
| 105 | int top_ep; |
| 106 | int top_ep_val; |
| 107 | int bottom_ep; |
| 108 | int bottom_ep_val; |
| 109 | enum ad714x_device_state state; |
| 110 | struct input_dev *input; |
| 111 | }; |
| 112 | |
| 113 | struct ad714x_button_drv { |
| 114 | enum ad714x_device_state state; |
| 115 | /* |
| 116 | * Unlike slider/wheel/touchpad, all buttons point to |
| 117 | * same input_dev instance |
| 118 | */ |
| 119 | struct input_dev *input; |
| 120 | }; |
| 121 | |
| 122 | struct ad714x_driver_data { |
| 123 | struct ad714x_slider_drv *slider; |
| 124 | struct ad714x_wheel_drv *wheel; |
| 125 | struct ad714x_touchpad_drv *touchpad; |
| 126 | struct ad714x_button_drv *button; |
| 127 | }; |
| 128 | |
| 129 | /* |
| 130 | * information to integrate all things which will be private data |
| 131 | * of spi/i2c device |
| 132 | */ |
| 133 | struct ad714x_chip { |
| 134 | unsigned short h_state; |
| 135 | unsigned short l_state; |
| 136 | unsigned short c_state; |
| 137 | unsigned short adc_reg[STAGE_NUM]; |
| 138 | unsigned short amb_reg[STAGE_NUM]; |
| 139 | unsigned short sensor_val[STAGE_NUM]; |
| 140 | |
| 141 | struct ad714x_platform_data *hw; |
| 142 | struct ad714x_driver_data *sw; |
| 143 | |
| 144 | int irq; |
| 145 | struct device *dev; |
| 146 | ad714x_read_t read; |
| 147 | ad714x_write_t write; |
| 148 | |
| 149 | struct mutex mutex; |
| 150 | |
| 151 | unsigned product; |
| 152 | unsigned version; |
| 153 | }; |
| 154 | |
| 155 | static void ad714x_use_com_int(struct ad714x_chip *ad714x, |
| 156 | int start_stage, int end_stage) |
| 157 | { |
| 158 | unsigned short data; |
| 159 | unsigned short mask; |
| 160 | |
| 161 | mask = ((1 << (end_stage + 1)) - 1) - (1 << start_stage); |
| 162 | |
| 163 | ad714x->read(ad714x->dev, STG_COM_INT_EN_REG, &data); |
| 164 | data |= 1 << start_stage; |
| 165 | ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data); |
| 166 | |
| 167 | ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data); |
| 168 | data &= ~mask; |
| 169 | ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data); |
| 170 | } |
| 171 | |
| 172 | static void ad714x_use_thr_int(struct ad714x_chip *ad714x, |
| 173 | int start_stage, int end_stage) |
| 174 | { |
| 175 | unsigned short data; |
| 176 | unsigned short mask; |
| 177 | |
| 178 | mask = ((1 << (end_stage + 1)) - 1) - (1 << start_stage); |
| 179 | |
| 180 | ad714x->read(ad714x->dev, STG_COM_INT_EN_REG, &data); |
| 181 | data &= ~(1 << start_stage); |
| 182 | ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data); |
| 183 | |
| 184 | ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data); |
| 185 | data |= mask; |
| 186 | ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data); |
| 187 | } |
| 188 | |
| 189 | static int ad714x_cal_highest_stage(struct ad714x_chip *ad714x, |
| 190 | int start_stage, int end_stage) |
| 191 | { |
| 192 | int max_res = 0; |
| 193 | int max_idx = 0; |
| 194 | int i; |
| 195 | |
| 196 | for (i = start_stage; i <= end_stage; i++) { |
| 197 | if (ad714x->sensor_val[i] > max_res) { |
| 198 | max_res = ad714x->sensor_val[i]; |
| 199 | max_idx = i; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | return max_idx; |
| 204 | } |
| 205 | |
| 206 | static int ad714x_cal_abs_pos(struct ad714x_chip *ad714x, |
| 207 | int start_stage, int end_stage, |
| 208 | int highest_stage, int max_coord) |
| 209 | { |
| 210 | int a_param, b_param; |
| 211 | |
| 212 | if (highest_stage == start_stage) { |
| 213 | a_param = ad714x->sensor_val[start_stage + 1]; |
| 214 | b_param = ad714x->sensor_val[start_stage] + |
| 215 | ad714x->sensor_val[start_stage + 1]; |
| 216 | } else if (highest_stage == end_stage) { |
| 217 | a_param = ad714x->sensor_val[end_stage] * |
| 218 | (end_stage - start_stage) + |
| 219 | ad714x->sensor_val[end_stage - 1] * |
| 220 | (end_stage - start_stage - 1); |
| 221 | b_param = ad714x->sensor_val[end_stage] + |
| 222 | ad714x->sensor_val[end_stage - 1]; |
| 223 | } else { |
| 224 | a_param = ad714x->sensor_val[highest_stage] * |
| 225 | (highest_stage - start_stage) + |
| 226 | ad714x->sensor_val[highest_stage - 1] * |
| 227 | (highest_stage - start_stage - 1) + |
| 228 | ad714x->sensor_val[highest_stage + 1] * |
| 229 | (highest_stage - start_stage + 1); |
| 230 | b_param = ad714x->sensor_val[highest_stage] + |
| 231 | ad714x->sensor_val[highest_stage - 1] + |
| 232 | ad714x->sensor_val[highest_stage + 1]; |
| 233 | } |
| 234 | |
| 235 | return (max_coord / (end_stage - start_stage)) * a_param / b_param; |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * One button can connect to multi positive and negative of CDCs |
| 240 | * Multi-buttons can connect to same positive/negative of one CDC |
| 241 | */ |
| 242 | static void ad714x_button_state_machine(struct ad714x_chip *ad714x, int idx) |
| 243 | { |
| 244 | struct ad714x_button_plat *hw = &ad714x->hw->button[idx]; |
| 245 | struct ad714x_button_drv *sw = &ad714x->sw->button[idx]; |
| 246 | |
| 247 | switch (sw->state) { |
| 248 | case IDLE: |
| 249 | if (((ad714x->h_state & hw->h_mask) == hw->h_mask) && |
| 250 | ((ad714x->l_state & hw->l_mask) == hw->l_mask)) { |
| 251 | dev_dbg(ad714x->dev, "button %d touched\n", idx); |
| 252 | input_report_key(sw->input, hw->keycode, 1); |
| 253 | input_sync(sw->input); |
| 254 | sw->state = ACTIVE; |
| 255 | } |
| 256 | break; |
| 257 | |
| 258 | case ACTIVE: |
| 259 | if (((ad714x->h_state & hw->h_mask) != hw->h_mask) || |
| 260 | ((ad714x->l_state & hw->l_mask) != hw->l_mask)) { |
| 261 | dev_dbg(ad714x->dev, "button %d released\n", idx); |
| 262 | input_report_key(sw->input, hw->keycode, 0); |
| 263 | input_sync(sw->input); |
| 264 | sw->state = IDLE; |
| 265 | } |
| 266 | break; |
| 267 | |
| 268 | default: |
| 269 | break; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * The response of a sensor is defined by the absolute number of codes |
| 275 | * between the current CDC value and the ambient value. |
| 276 | */ |
| 277 | static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int idx) |
| 278 | { |
| 279 | struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; |
| 280 | int i; |
| 281 | |
| 282 | for (i = hw->start_stage; i <= hw->end_stage; i++) { |
| 283 | ad714x->read(ad714x->dev, CDC_RESULT_S0 + i, |
| 284 | &ad714x->adc_reg[i]); |
| 285 | ad714x->read(ad714x->dev, |
| 286 | STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, |
| 287 | &ad714x->amb_reg[i]); |
| 288 | |
| 289 | ad714x->sensor_val[i] = abs(ad714x->adc_reg[i] - |
| 290 | ad714x->amb_reg[i]); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | static void ad714x_slider_cal_highest_stage(struct ad714x_chip *ad714x, int idx) |
| 295 | { |
| 296 | struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; |
| 297 | struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; |
| 298 | |
| 299 | sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage, |
| 300 | hw->end_stage); |
| 301 | |
| 302 | dev_dbg(ad714x->dev, "slider %d highest_stage:%d\n", idx, |
| 303 | sw->highest_stage); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * The formulae are very straight forward. It uses the sensor with the |
| 308 | * highest response and the 2 adjacent ones. |
| 309 | * When Sensor 0 has the highest response, only sensor 0 and sensor 1 |
| 310 | * are used in the calculations. Similarly when the last sensor has the |
| 311 | * highest response, only the last sensor and the second last sensors |
| 312 | * are used in the calculations. |
| 313 | * |
| 314 | * For i= idx_of_peak_Sensor-1 to i= idx_of_peak_Sensor+1 |
| 315 | * v += Sensor response(i)*i |
| 316 | * w += Sensor response(i) |
| 317 | * POS=(Number_of_Positions_Wanted/(Number_of_Sensors_Used-1)) *(v/w) |
| 318 | */ |
| 319 | static void ad714x_slider_cal_abs_pos(struct ad714x_chip *ad714x, int idx) |
| 320 | { |
| 321 | struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; |
| 322 | struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; |
| 323 | |
| 324 | sw->abs_pos = ad714x_cal_abs_pos(ad714x, hw->start_stage, hw->end_stage, |
| 325 | sw->highest_stage, hw->max_coord); |
| 326 | |
| 327 | dev_dbg(ad714x->dev, "slider %d absolute position:%d\n", idx, |
| 328 | sw->abs_pos); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * To minimise the Impact of the noise on the algorithm, ADI developed a |
| 333 | * routine that filters the CDC results after they have been read by the |
| 334 | * host processor. |
| 335 | * The filter used is an Infinite Input Response(IIR) filter implemented |
| 336 | * in firmware and attenuates the noise on the CDC results after they've |
| 337 | * been read by the host processor. |
| 338 | * Filtered_CDC_result = (Filtered_CDC_result * (10 - Coefficient) + |
| 339 | * Latest_CDC_result * Coefficient)/10 |
| 340 | */ |
| 341 | static void ad714x_slider_cal_flt_pos(struct ad714x_chip *ad714x, int idx) |
| 342 | { |
| 343 | struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; |
| 344 | |
| 345 | sw->flt_pos = (sw->flt_pos * (10 - 4) + |
| 346 | sw->abs_pos * 4)/10; |
| 347 | |
| 348 | dev_dbg(ad714x->dev, "slider %d filter position:%d\n", idx, |
| 349 | sw->flt_pos); |
| 350 | } |
| 351 | |
| 352 | static void ad714x_slider_use_com_int(struct ad714x_chip *ad714x, int idx) |
| 353 | { |
| 354 | struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; |
| 355 | |
| 356 | ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage); |
| 357 | } |
| 358 | |
| 359 | static void ad714x_slider_use_thr_int(struct ad714x_chip *ad714x, int idx) |
| 360 | { |
| 361 | struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; |
| 362 | |
| 363 | ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage); |
| 364 | } |
| 365 | |
| 366 | static void ad714x_slider_state_machine(struct ad714x_chip *ad714x, int idx) |
| 367 | { |
| 368 | struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; |
| 369 | struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; |
| 370 | unsigned short h_state, c_state; |
| 371 | unsigned short mask; |
| 372 | |
| 373 | mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1); |
| 374 | |
| 375 | h_state = ad714x->h_state & mask; |
| 376 | c_state = ad714x->c_state & mask; |
| 377 | |
| 378 | switch (sw->state) { |
| 379 | case IDLE: |
| 380 | if (h_state) { |
| 381 | sw->state = JITTER; |
| 382 | /* In End of Conversion interrupt mode, the AD714X |
| 383 | * continuously generates hardware interrupts. |
| 384 | */ |
| 385 | ad714x_slider_use_com_int(ad714x, idx); |
| 386 | dev_dbg(ad714x->dev, "slider %d touched\n", idx); |
| 387 | } |
| 388 | break; |
| 389 | |
| 390 | case JITTER: |
| 391 | if (c_state == mask) { |
| 392 | ad714x_slider_cal_sensor_val(ad714x, idx); |
| 393 | ad714x_slider_cal_highest_stage(ad714x, idx); |
| 394 | ad714x_slider_cal_abs_pos(ad714x, idx); |
| 395 | sw->flt_pos = sw->abs_pos; |
| 396 | sw->state = ACTIVE; |
| 397 | } |
| 398 | break; |
| 399 | |
| 400 | case ACTIVE: |
| 401 | if (c_state == mask) { |
| 402 | if (h_state) { |
| 403 | ad714x_slider_cal_sensor_val(ad714x, idx); |
| 404 | ad714x_slider_cal_highest_stage(ad714x, idx); |
| 405 | ad714x_slider_cal_abs_pos(ad714x, idx); |
| 406 | ad714x_slider_cal_flt_pos(ad714x, idx); |
| 407 | |
| 408 | input_report_abs(sw->input, ABS_X, sw->flt_pos); |
| 409 | input_report_key(sw->input, BTN_TOUCH, 1); |
| 410 | } else { |
| 411 | /* When the user lifts off the sensor, configure |
| 412 | * the AD714X back to threshold interrupt mode. |
| 413 | */ |
| 414 | ad714x_slider_use_thr_int(ad714x, idx); |
| 415 | sw->state = IDLE; |
| 416 | input_report_key(sw->input, BTN_TOUCH, 0); |
| 417 | dev_dbg(ad714x->dev, "slider %d released\n", |
| 418 | idx); |
| 419 | } |
| 420 | input_sync(sw->input); |
| 421 | } |
| 422 | break; |
| 423 | |
| 424 | default: |
| 425 | break; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * When the scroll wheel is activated, we compute the absolute position based |
| 431 | * on the sensor values. To calculate the position, we first determine the |
| 432 | * sensor that has the greatest response among the 8 sensors that constitutes |
| 433 | * the scrollwheel. Then we determined the 2 sensors on either sides of the |
| 434 | * sensor with the highest response and we apply weights to these sensors. |
| 435 | */ |
| 436 | static void ad714x_wheel_cal_highest_stage(struct ad714x_chip *ad714x, int idx) |
| 437 | { |
| 438 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 439 | struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; |
| 440 | |
| 441 | sw->pre_highest_stage = sw->highest_stage; |
| 442 | sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage, |
| 443 | hw->end_stage); |
| 444 | |
| 445 | dev_dbg(ad714x->dev, "wheel %d highest_stage:%d\n", idx, |
| 446 | sw->highest_stage); |
| 447 | } |
| 448 | |
| 449 | static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int idx) |
| 450 | { |
| 451 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 452 | int i; |
| 453 | |
| 454 | for (i = hw->start_stage; i <= hw->end_stage; i++) { |
| 455 | ad714x->read(ad714x->dev, CDC_RESULT_S0 + i, |
| 456 | &ad714x->adc_reg[i]); |
| 457 | ad714x->read(ad714x->dev, |
| 458 | STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, |
| 459 | &ad714x->amb_reg[i]); |
| 460 | if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) |
| 461 | ad714x->sensor_val[i] = ad714x->adc_reg[i] - |
| 462 | ad714x->amb_reg[i]; |
| 463 | else |
| 464 | ad714x->sensor_val[i] = 0; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | * When the scroll wheel is activated, we compute the absolute position based |
| 470 | * on the sensor values. To calculate the position, we first determine the |
| 471 | * sensor that has the greatest response among the 8 sensors that constitutes |
| 472 | * the scrollwheel. Then we determined the 2 sensors on either sides of the |
| 473 | * sensor with the highest response and we apply weights to these sensors. The |
| 474 | * result of this computation gives us the mean value which defined by the |
| 475 | * following formula: |
| 476 | * For i= second_before_highest_stage to i= second_after_highest_stage |
| 477 | * v += Sensor response(i)*WEIGHT*(i+3) |
| 478 | * w += Sensor response(i) |
| 479 | * Mean_Value=v/w |
| 480 | * pos_on_scrollwheel = (Mean_Value - position_offset) / position_ratio |
| 481 | */ |
| 482 | |
| 483 | #define WEIGHT_FACTOR 30 |
| 484 | /* This constant prevents the "PositionOffset" from reaching a big value */ |
| 485 | #define OFFSET_POSITION_CLAMP 120 |
| 486 | static void ad714x_wheel_cal_abs_pos(struct ad714x_chip *ad714x, int idx) |
| 487 | { |
| 488 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 489 | struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; |
| 490 | int stage_num = hw->end_stage - hw->start_stage + 1; |
| 491 | int second_before, first_before, highest, first_after, second_after; |
| 492 | int a_param, b_param; |
| 493 | |
| 494 | /* Calculate Mean value */ |
| 495 | |
| 496 | second_before = (sw->highest_stage + stage_num - 2) % stage_num; |
| 497 | first_before = (sw->highest_stage + stage_num - 1) % stage_num; |
| 498 | highest = sw->highest_stage; |
| 499 | first_after = (sw->highest_stage + stage_num + 1) % stage_num; |
| 500 | second_after = (sw->highest_stage + stage_num + 2) % stage_num; |
| 501 | |
| 502 | if (((sw->highest_stage - hw->start_stage) > 1) && |
| 503 | ((hw->end_stage - sw->highest_stage) > 1)) { |
| 504 | a_param = ad714x->sensor_val[second_before] * |
| 505 | (second_before - hw->start_stage + 3) + |
| 506 | ad714x->sensor_val[first_before] * |
| 507 | (second_before - hw->start_stage + 3) + |
| 508 | ad714x->sensor_val[highest] * |
| 509 | (second_before - hw->start_stage + 3) + |
| 510 | ad714x->sensor_val[first_after] * |
| 511 | (first_after - hw->start_stage + 3) + |
| 512 | ad714x->sensor_val[second_after] * |
| 513 | (second_after - hw->start_stage + 3); |
| 514 | } else { |
| 515 | a_param = ad714x->sensor_val[second_before] * |
| 516 | (second_before - hw->start_stage + 1) + |
| 517 | ad714x->sensor_val[first_before] * |
| 518 | (second_before - hw->start_stage + 2) + |
| 519 | ad714x->sensor_val[highest] * |
| 520 | (second_before - hw->start_stage + 3) + |
| 521 | ad714x->sensor_val[first_after] * |
| 522 | (first_after - hw->start_stage + 4) + |
| 523 | ad714x->sensor_val[second_after] * |
| 524 | (second_after - hw->start_stage + 5); |
| 525 | } |
| 526 | a_param *= WEIGHT_FACTOR; |
| 527 | |
| 528 | b_param = ad714x->sensor_val[second_before] + |
| 529 | ad714x->sensor_val[first_before] + |
| 530 | ad714x->sensor_val[highest] + |
| 531 | ad714x->sensor_val[first_after] + |
| 532 | ad714x->sensor_val[second_after]; |
| 533 | |
| 534 | sw->pre_mean_value = sw->mean_value; |
| 535 | sw->mean_value = a_param / b_param; |
| 536 | |
| 537 | /* Calculate the offset */ |
| 538 | |
| 539 | if ((sw->pre_highest_stage == hw->end_stage) && |
| 540 | (sw->highest_stage == hw->start_stage)) |
| 541 | sw->pos_offset = sw->mean_value; |
| 542 | else if ((sw->pre_highest_stage == hw->start_stage) && |
| 543 | (sw->highest_stage == hw->end_stage)) |
| 544 | sw->pos_offset = sw->pre_mean_value; |
| 545 | |
| 546 | if (sw->pos_offset > OFFSET_POSITION_CLAMP) |
| 547 | sw->pos_offset = OFFSET_POSITION_CLAMP; |
| 548 | |
| 549 | /* Calculate the mean value without the offset */ |
| 550 | |
| 551 | sw->pre_mean_value_no_offset = sw->mean_value_no_offset; |
| 552 | sw->mean_value_no_offset = sw->mean_value - sw->pos_offset; |
| 553 | if (sw->mean_value_no_offset < 0) |
| 554 | sw->mean_value_no_offset = 0; |
| 555 | |
| 556 | /* Calculate ratio to scale down to NUMBER_OF_WANTED_POSITIONS */ |
| 557 | |
| 558 | if ((sw->pre_highest_stage == hw->end_stage) && |
| 559 | (sw->highest_stage == hw->start_stage)) |
| 560 | sw->pos_ratio = (sw->pre_mean_value_no_offset * 100) / |
| 561 | hw->max_coord; |
| 562 | else if ((sw->pre_highest_stage == hw->start_stage) && |
| 563 | (sw->highest_stage == hw->end_stage)) |
| 564 | sw->pos_ratio = (sw->mean_value_no_offset * 100) / |
| 565 | hw->max_coord; |
| 566 | sw->abs_pos = (sw->mean_value_no_offset * 100) / sw->pos_ratio; |
| 567 | if (sw->abs_pos > hw->max_coord) |
| 568 | sw->abs_pos = hw->max_coord; |
| 569 | } |
| 570 | |
| 571 | static void ad714x_wheel_cal_flt_pos(struct ad714x_chip *ad714x, int idx) |
| 572 | { |
| 573 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 574 | struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; |
| 575 | if (((sw->pre_highest_stage == hw->end_stage) && |
| 576 | (sw->highest_stage == hw->start_stage)) || |
| 577 | ((sw->pre_highest_stage == hw->start_stage) && |
| 578 | (sw->highest_stage == hw->end_stage))) |
| 579 | sw->flt_pos = sw->abs_pos; |
| 580 | else |
| 581 | sw->flt_pos = ((sw->flt_pos * 30) + (sw->abs_pos * 71)) / 100; |
| 582 | |
| 583 | if (sw->flt_pos > hw->max_coord) |
| 584 | sw->flt_pos = hw->max_coord; |
| 585 | } |
| 586 | |
| 587 | static void ad714x_wheel_use_com_int(struct ad714x_chip *ad714x, int idx) |
| 588 | { |
| 589 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 590 | |
| 591 | ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage); |
| 592 | } |
| 593 | |
| 594 | static void ad714x_wheel_use_thr_int(struct ad714x_chip *ad714x, int idx) |
| 595 | { |
| 596 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 597 | |
| 598 | ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage); |
| 599 | } |
| 600 | |
| 601 | static void ad714x_wheel_state_machine(struct ad714x_chip *ad714x, int idx) |
| 602 | { |
| 603 | struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; |
| 604 | struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; |
| 605 | unsigned short h_state, c_state; |
| 606 | unsigned short mask; |
| 607 | |
| 608 | mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1); |
| 609 | |
| 610 | h_state = ad714x->h_state & mask; |
| 611 | c_state = ad714x->c_state & mask; |
| 612 | |
| 613 | switch (sw->state) { |
| 614 | case IDLE: |
| 615 | if (h_state) { |
| 616 | sw->state = JITTER; |
| 617 | /* In End of Conversion interrupt mode, the AD714X |
| 618 | * continuously generates hardware interrupts. |
| 619 | */ |
| 620 | ad714x_wheel_use_com_int(ad714x, idx); |
| 621 | dev_dbg(ad714x->dev, "wheel %d touched\n", idx); |
| 622 | } |
| 623 | break; |
| 624 | |
| 625 | case JITTER: |
| 626 | if (c_state == mask) { |
| 627 | ad714x_wheel_cal_sensor_val(ad714x, idx); |
| 628 | ad714x_wheel_cal_highest_stage(ad714x, idx); |
| 629 | ad714x_wheel_cal_abs_pos(ad714x, idx); |
| 630 | sw->flt_pos = sw->abs_pos; |
| 631 | sw->state = ACTIVE; |
| 632 | } |
| 633 | break; |
| 634 | |
| 635 | case ACTIVE: |
| 636 | if (c_state == mask) { |
| 637 | if (h_state) { |
| 638 | ad714x_wheel_cal_sensor_val(ad714x, idx); |
| 639 | ad714x_wheel_cal_highest_stage(ad714x, idx); |
| 640 | ad714x_wheel_cal_abs_pos(ad714x, idx); |
| 641 | ad714x_wheel_cal_flt_pos(ad714x, idx); |
| 642 | |
| 643 | input_report_abs(sw->input, ABS_WHEEL, |
| 644 | sw->abs_pos); |
| 645 | input_report_key(sw->input, BTN_TOUCH, 1); |
| 646 | } else { |
| 647 | /* When the user lifts off the sensor, configure |
| 648 | * the AD714X back to threshold interrupt mode. |
| 649 | */ |
| 650 | ad714x_wheel_use_thr_int(ad714x, idx); |
| 651 | sw->state = IDLE; |
| 652 | input_report_key(sw->input, BTN_TOUCH, 0); |
| 653 | |
| 654 | dev_dbg(ad714x->dev, "wheel %d released\n", |
| 655 | idx); |
| 656 | } |
| 657 | input_sync(sw->input); |
| 658 | } |
| 659 | break; |
| 660 | |
| 661 | default: |
| 662 | break; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx) |
| 667 | { |
| 668 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 669 | int i; |
| 670 | |
| 671 | for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) { |
| 672 | ad714x->read(ad714x->dev, CDC_RESULT_S0 + i, |
| 673 | &ad714x->adc_reg[i]); |
| 674 | ad714x->read(ad714x->dev, |
| 675 | STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, |
| 676 | &ad714x->amb_reg[i]); |
| 677 | if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) |
| 678 | ad714x->sensor_val[i] = ad714x->adc_reg[i] - |
| 679 | ad714x->amb_reg[i]; |
| 680 | else |
| 681 | ad714x->sensor_val[i] = 0; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | static void touchpad_cal_highest_stage(struct ad714x_chip *ad714x, int idx) |
| 686 | { |
| 687 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 688 | struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; |
| 689 | |
| 690 | sw->x_highest_stage = ad714x_cal_highest_stage(ad714x, |
| 691 | hw->x_start_stage, hw->x_end_stage); |
| 692 | sw->y_highest_stage = ad714x_cal_highest_stage(ad714x, |
| 693 | hw->y_start_stage, hw->y_end_stage); |
| 694 | |
| 695 | dev_dbg(ad714x->dev, |
| 696 | "touchpad %d x_highest_stage:%d, y_highest_stage:%d\n", |
| 697 | idx, sw->x_highest_stage, sw->y_highest_stage); |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * If 2 fingers are touching the sensor then 2 peaks can be observed in the |
| 702 | * distribution. |
| 703 | * The arithmetic doesn't support to get absolute coordinates for multi-touch |
| 704 | * yet. |
| 705 | */ |
| 706 | static int touchpad_check_second_peak(struct ad714x_chip *ad714x, int idx) |
| 707 | { |
| 708 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 709 | struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; |
| 710 | int i; |
| 711 | |
| 712 | for (i = hw->x_start_stage; i < sw->x_highest_stage; i++) { |
| 713 | if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1]) |
| 714 | > (ad714x->sensor_val[i + 1] / 10)) |
| 715 | return 1; |
| 716 | } |
| 717 | |
| 718 | for (i = sw->x_highest_stage; i < hw->x_end_stage; i++) { |
| 719 | if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i]) |
| 720 | > (ad714x->sensor_val[i] / 10)) |
| 721 | return 1; |
| 722 | } |
| 723 | |
| 724 | for (i = hw->y_start_stage; i < sw->y_highest_stage; i++) { |
| 725 | if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1]) |
| 726 | > (ad714x->sensor_val[i + 1] / 10)) |
| 727 | return 1; |
| 728 | } |
| 729 | |
| 730 | for (i = sw->y_highest_stage; i < hw->y_end_stage; i++) { |
| 731 | if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i]) |
| 732 | > (ad714x->sensor_val[i] / 10)) |
| 733 | return 1; |
| 734 | } |
| 735 | |
| 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | /* |
| 740 | * If only one finger is used to activate the touch pad then only 1 peak will be |
| 741 | * registered in the distribution. This peak and the 2 adjacent sensors will be |
| 742 | * used in the calculation of the absolute position. This will prevent hand |
| 743 | * shadows to affect the absolute position calculation. |
| 744 | */ |
| 745 | static void touchpad_cal_abs_pos(struct ad714x_chip *ad714x, int idx) |
| 746 | { |
| 747 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 748 | struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; |
| 749 | |
| 750 | sw->x_abs_pos = ad714x_cal_abs_pos(ad714x, hw->x_start_stage, |
| 751 | hw->x_end_stage, sw->x_highest_stage, hw->x_max_coord); |
| 752 | sw->y_abs_pos = ad714x_cal_abs_pos(ad714x, hw->y_start_stage, |
| 753 | hw->y_end_stage, sw->y_highest_stage, hw->y_max_coord); |
| 754 | |
| 755 | dev_dbg(ad714x->dev, "touchpad %d absolute position:(%d, %d)\n", idx, |
| 756 | sw->x_abs_pos, sw->y_abs_pos); |
| 757 | } |
| 758 | |
| 759 | static void touchpad_cal_flt_pos(struct ad714x_chip *ad714x, int idx) |
| 760 | { |
| 761 | struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; |
| 762 | |
| 763 | sw->x_flt_pos = (sw->x_flt_pos * (10 - 4) + |
| 764 | sw->x_abs_pos * 4)/10; |
| 765 | sw->y_flt_pos = (sw->y_flt_pos * (10 - 4) + |
| 766 | sw->y_abs_pos * 4)/10; |
| 767 | |
| 768 | dev_dbg(ad714x->dev, "touchpad %d filter position:(%d, %d)\n", |
| 769 | idx, sw->x_flt_pos, sw->y_flt_pos); |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * To prevent distortion from showing in the absolute position, it is |
| 774 | * necessary to detect the end points. When endpoints are detected, the |
| 775 | * driver stops updating the status variables with absolute positions. |
| 776 | * End points are detected on the 4 edges of the touchpad sensor. The |
| 777 | * method to detect them is the same for all 4. |
| 778 | * To detect the end points, the firmware computes the difference in |
| 779 | * percent between the sensor on the edge and the adjacent one. The |
| 780 | * difference is calculated in percent in order to make the end point |
| 781 | * detection independent of the pressure. |
| 782 | */ |
| 783 | |
| 784 | #define LEFT_END_POINT_DETECTION_LEVEL 550 |
| 785 | #define RIGHT_END_POINT_DETECTION_LEVEL 750 |
| 786 | #define LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL 850 |
| 787 | #define TOP_END_POINT_DETECTION_LEVEL 550 |
| 788 | #define BOTTOM_END_POINT_DETECTION_LEVEL 950 |
| 789 | #define TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL 700 |
| 790 | static int touchpad_check_endpoint(struct ad714x_chip *ad714x, int idx) |
| 791 | { |
| 792 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 793 | struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; |
| 794 | int percent_sensor_diff; |
| 795 | |
| 796 | /* left endpoint detect */ |
| 797 | percent_sensor_diff = (ad714x->sensor_val[hw->x_start_stage] - |
| 798 | ad714x->sensor_val[hw->x_start_stage + 1]) * 100 / |
| 799 | ad714x->sensor_val[hw->x_start_stage + 1]; |
| 800 | if (!sw->left_ep) { |
| 801 | if (percent_sensor_diff >= LEFT_END_POINT_DETECTION_LEVEL) { |
| 802 | sw->left_ep = 1; |
| 803 | sw->left_ep_val = |
| 804 | ad714x->sensor_val[hw->x_start_stage + 1]; |
| 805 | } |
| 806 | } else { |
| 807 | if ((percent_sensor_diff < LEFT_END_POINT_DETECTION_LEVEL) && |
| 808 | (ad714x->sensor_val[hw->x_start_stage + 1] > |
| 809 | LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->left_ep_val)) |
| 810 | sw->left_ep = 0; |
| 811 | } |
| 812 | |
| 813 | /* right endpoint detect */ |
| 814 | percent_sensor_diff = (ad714x->sensor_val[hw->x_end_stage] - |
| 815 | ad714x->sensor_val[hw->x_end_stage - 1]) * 100 / |
| 816 | ad714x->sensor_val[hw->x_end_stage - 1]; |
| 817 | if (!sw->right_ep) { |
| 818 | if (percent_sensor_diff >= RIGHT_END_POINT_DETECTION_LEVEL) { |
| 819 | sw->right_ep = 1; |
| 820 | sw->right_ep_val = |
| 821 | ad714x->sensor_val[hw->x_end_stage - 1]; |
| 822 | } |
| 823 | } else { |
| 824 | if ((percent_sensor_diff < RIGHT_END_POINT_DETECTION_LEVEL) && |
| 825 | (ad714x->sensor_val[hw->x_end_stage - 1] > |
| 826 | LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->right_ep_val)) |
| 827 | sw->right_ep = 0; |
| 828 | } |
| 829 | |
| 830 | /* top endpoint detect */ |
| 831 | percent_sensor_diff = (ad714x->sensor_val[hw->y_start_stage] - |
| 832 | ad714x->sensor_val[hw->y_start_stage + 1]) * 100 / |
| 833 | ad714x->sensor_val[hw->y_start_stage + 1]; |
| 834 | if (!sw->top_ep) { |
| 835 | if (percent_sensor_diff >= TOP_END_POINT_DETECTION_LEVEL) { |
| 836 | sw->top_ep = 1; |
| 837 | sw->top_ep_val = |
| 838 | ad714x->sensor_val[hw->y_start_stage + 1]; |
| 839 | } |
| 840 | } else { |
| 841 | if ((percent_sensor_diff < TOP_END_POINT_DETECTION_LEVEL) && |
| 842 | (ad714x->sensor_val[hw->y_start_stage + 1] > |
| 843 | TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->top_ep_val)) |
| 844 | sw->top_ep = 0; |
| 845 | } |
| 846 | |
| 847 | /* bottom endpoint detect */ |
| 848 | percent_sensor_diff = (ad714x->sensor_val[hw->y_end_stage] - |
| 849 | ad714x->sensor_val[hw->y_end_stage - 1]) * 100 / |
| 850 | ad714x->sensor_val[hw->y_end_stage - 1]; |
| 851 | if (!sw->bottom_ep) { |
| 852 | if (percent_sensor_diff >= BOTTOM_END_POINT_DETECTION_LEVEL) { |
| 853 | sw->bottom_ep = 1; |
| 854 | sw->bottom_ep_val = |
| 855 | ad714x->sensor_val[hw->y_end_stage - 1]; |
| 856 | } |
| 857 | } else { |
| 858 | if ((percent_sensor_diff < BOTTOM_END_POINT_DETECTION_LEVEL) && |
| 859 | (ad714x->sensor_val[hw->y_end_stage - 1] > |
| 860 | TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->bottom_ep_val)) |
| 861 | sw->bottom_ep = 0; |
| 862 | } |
| 863 | |
| 864 | return sw->left_ep || sw->right_ep || sw->top_ep || sw->bottom_ep; |
| 865 | } |
| 866 | |
| 867 | static void touchpad_use_com_int(struct ad714x_chip *ad714x, int idx) |
| 868 | { |
| 869 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 870 | |
| 871 | ad714x_use_com_int(ad714x, hw->x_start_stage, hw->x_end_stage); |
| 872 | } |
| 873 | |
| 874 | static void touchpad_use_thr_int(struct ad714x_chip *ad714x, int idx) |
| 875 | { |
| 876 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 877 | |
| 878 | ad714x_use_thr_int(ad714x, hw->x_start_stage, hw->x_end_stage); |
| 879 | ad714x_use_thr_int(ad714x, hw->y_start_stage, hw->y_end_stage); |
| 880 | } |
| 881 | |
| 882 | static void ad714x_touchpad_state_machine(struct ad714x_chip *ad714x, int idx) |
| 883 | { |
| 884 | struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; |
| 885 | struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; |
| 886 | unsigned short h_state, c_state; |
| 887 | unsigned short mask; |
| 888 | |
| 889 | mask = (((1 << (hw->x_end_stage + 1)) - 1) - |
| 890 | ((1 << hw->x_start_stage) - 1)) + |
| 891 | (((1 << (hw->y_end_stage + 1)) - 1) - |
| 892 | ((1 << hw->y_start_stage) - 1)); |
| 893 | |
| 894 | h_state = ad714x->h_state & mask; |
| 895 | c_state = ad714x->c_state & mask; |
| 896 | |
| 897 | switch (sw->state) { |
| 898 | case IDLE: |
| 899 | if (h_state) { |
| 900 | sw->state = JITTER; |
| 901 | /* In End of Conversion interrupt mode, the AD714X |
| 902 | * continuously generates hardware interrupts. |
| 903 | */ |
| 904 | touchpad_use_com_int(ad714x, idx); |
| 905 | dev_dbg(ad714x->dev, "touchpad %d touched\n", idx); |
| 906 | } |
| 907 | break; |
| 908 | |
| 909 | case JITTER: |
| 910 | if (c_state == mask) { |
| 911 | touchpad_cal_sensor_val(ad714x, idx); |
| 912 | touchpad_cal_highest_stage(ad714x, idx); |
| 913 | if ((!touchpad_check_second_peak(ad714x, idx)) && |
| 914 | (!touchpad_check_endpoint(ad714x, idx))) { |
| 915 | dev_dbg(ad714x->dev, |
| 916 | "touchpad%d, 2 fingers or endpoint\n", |
| 917 | idx); |
| 918 | touchpad_cal_abs_pos(ad714x, idx); |
| 919 | sw->x_flt_pos = sw->x_abs_pos; |
| 920 | sw->y_flt_pos = sw->y_abs_pos; |
| 921 | sw->state = ACTIVE; |
| 922 | } |
| 923 | } |
| 924 | break; |
| 925 | |
| 926 | case ACTIVE: |
| 927 | if (c_state == mask) { |
| 928 | if (h_state) { |
| 929 | touchpad_cal_sensor_val(ad714x, idx); |
| 930 | touchpad_cal_highest_stage(ad714x, idx); |
| 931 | if ((!touchpad_check_second_peak(ad714x, idx)) |
| 932 | && (!touchpad_check_endpoint(ad714x, idx))) { |
| 933 | touchpad_cal_abs_pos(ad714x, idx); |
| 934 | touchpad_cal_flt_pos(ad714x, idx); |
| 935 | input_report_abs(sw->input, ABS_X, |
| 936 | sw->x_flt_pos); |
| 937 | input_report_abs(sw->input, ABS_Y, |
| 938 | sw->y_flt_pos); |
| 939 | input_report_key(sw->input, BTN_TOUCH, |
| 940 | 1); |
| 941 | } |
| 942 | } else { |
| 943 | /* When the user lifts off the sensor, configure |
| 944 | * the AD714X back to threshold interrupt mode. |
| 945 | */ |
| 946 | touchpad_use_thr_int(ad714x, idx); |
| 947 | sw->state = IDLE; |
| 948 | input_report_key(sw->input, BTN_TOUCH, 0); |
| 949 | dev_dbg(ad714x->dev, "touchpad %d released\n", |
| 950 | idx); |
| 951 | } |
| 952 | input_sync(sw->input); |
| 953 | } |
| 954 | break; |
| 955 | |
| 956 | default: |
| 957 | break; |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | static int ad714x_hw_detect(struct ad714x_chip *ad714x) |
| 962 | { |
| 963 | unsigned short data; |
| 964 | |
| 965 | ad714x->read(ad714x->dev, AD714X_PARTID_REG, &data); |
| 966 | switch (data & 0xFFF0) { |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 967 | case AD7142_PARTID: |
| 968 | ad714x->product = 0x7142; |
| 969 | ad714x->version = data & 0xF; |
| 970 | dev_info(ad714x->dev, "found AD7142 captouch, rev:%d\n", |
| 971 | ad714x->version); |
| 972 | return 0; |
| 973 | |
Barry Song | 6c04d7b | 2010-03-21 23:23:29 -0700 | [diff] [blame] | 974 | case AD7143_PARTID: |
| 975 | ad714x->product = 0x7143; |
| 976 | ad714x->version = data & 0xF; |
| 977 | dev_info(ad714x->dev, "found AD7143 captouch, rev:%d\n", |
| 978 | ad714x->version); |
| 979 | return 0; |
| 980 | |
| 981 | case AD7147_PARTID: |
| 982 | ad714x->product = 0x7147; |
| 983 | ad714x->version = data & 0xF; |
| 984 | dev_info(ad714x->dev, "found AD7147(A) captouch, rev:%d\n", |
| 985 | ad714x->version); |
| 986 | return 0; |
| 987 | |
| 988 | case AD7148_PARTID: |
| 989 | ad714x->product = 0x7148; |
| 990 | ad714x->version = data & 0xF; |
| 991 | dev_info(ad714x->dev, "found AD7148 captouch, rev:%d\n", |
| 992 | ad714x->version); |
| 993 | return 0; |
| 994 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 995 | default: |
| 996 | dev_err(ad714x->dev, |
| 997 | "fail to detect AD714X captouch, read ID is %04x\n", |
| 998 | data); |
| 999 | return -ENODEV; |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | static void ad714x_hw_init(struct ad714x_chip *ad714x) |
| 1004 | { |
| 1005 | int i, j; |
| 1006 | unsigned short reg_base; |
| 1007 | unsigned short data; |
| 1008 | |
| 1009 | /* configuration CDC and interrupts */ |
| 1010 | |
| 1011 | for (i = 0; i < STAGE_NUM; i++) { |
| 1012 | reg_base = AD714X_STAGECFG_REG + i * STAGE_CFGREG_NUM; |
| 1013 | for (j = 0; j < STAGE_CFGREG_NUM; j++) |
| 1014 | ad714x->write(ad714x->dev, reg_base + j, |
| 1015 | ad714x->hw->stage_cfg_reg[i][j]); |
| 1016 | } |
| 1017 | |
| 1018 | for (i = 0; i < SYS_CFGREG_NUM; i++) |
| 1019 | ad714x->write(ad714x->dev, AD714X_SYSCFG_REG + i, |
| 1020 | ad714x->hw->sys_cfg_reg[i]); |
| 1021 | for (i = 0; i < SYS_CFGREG_NUM; i++) |
| 1022 | ad714x->read(ad714x->dev, AD714X_SYSCFG_REG + i, |
| 1023 | &data); |
| 1024 | |
| 1025 | ad714x->write(ad714x->dev, AD714X_STG_CAL_EN_REG, 0xFFF); |
| 1026 | |
| 1027 | /* clear all interrupts */ |
| 1028 | ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &data); |
| 1029 | ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data); |
| 1030 | ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data); |
| 1031 | } |
| 1032 | |
| 1033 | static irqreturn_t ad714x_interrupt_thread(int irq, void *data) |
| 1034 | { |
| 1035 | struct ad714x_chip *ad714x = data; |
| 1036 | int i; |
| 1037 | |
| 1038 | mutex_lock(&ad714x->mutex); |
| 1039 | |
| 1040 | ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &ad714x->l_state); |
| 1041 | ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &ad714x->h_state); |
| 1042 | ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &ad714x->c_state); |
| 1043 | |
| 1044 | for (i = 0; i < ad714x->hw->button_num; i++) |
| 1045 | ad714x_button_state_machine(ad714x, i); |
| 1046 | for (i = 0; i < ad714x->hw->slider_num; i++) |
| 1047 | ad714x_slider_state_machine(ad714x, i); |
| 1048 | for (i = 0; i < ad714x->hw->wheel_num; i++) |
| 1049 | ad714x_wheel_state_machine(ad714x, i); |
| 1050 | for (i = 0; i < ad714x->hw->touchpad_num; i++) |
| 1051 | ad714x_touchpad_state_machine(ad714x, i); |
| 1052 | |
| 1053 | mutex_unlock(&ad714x->mutex); |
| 1054 | |
| 1055 | return IRQ_HANDLED; |
| 1056 | } |
| 1057 | |
| 1058 | #define MAX_DEVICE_NUM 8 |
| 1059 | struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq, |
| 1060 | ad714x_read_t read, ad714x_write_t write) |
| 1061 | { |
| 1062 | int i, alloc_idx; |
| 1063 | int error; |
| 1064 | struct input_dev *input[MAX_DEVICE_NUM]; |
| 1065 | |
| 1066 | struct ad714x_platform_data *plat_data = dev->platform_data; |
| 1067 | struct ad714x_chip *ad714x; |
| 1068 | void *drv_mem; |
| 1069 | |
| 1070 | struct ad714x_button_drv *bt_drv; |
| 1071 | struct ad714x_slider_drv *sd_drv; |
| 1072 | struct ad714x_wheel_drv *wl_drv; |
| 1073 | struct ad714x_touchpad_drv *tp_drv; |
| 1074 | |
| 1075 | |
| 1076 | if (irq <= 0) { |
| 1077 | dev_err(dev, "IRQ not configured!\n"); |
| 1078 | error = -EINVAL; |
| 1079 | goto err_out; |
| 1080 | } |
| 1081 | |
| 1082 | if (dev->platform_data == NULL) { |
| 1083 | dev_err(dev, "platform data for ad714x doesn't exist\n"); |
| 1084 | error = -EINVAL; |
| 1085 | goto err_out; |
| 1086 | } |
| 1087 | |
| 1088 | ad714x = kzalloc(sizeof(*ad714x) + sizeof(*ad714x->sw) + |
| 1089 | sizeof(*sd_drv) * plat_data->slider_num + |
| 1090 | sizeof(*wl_drv) * plat_data->wheel_num + |
| 1091 | sizeof(*tp_drv) * plat_data->touchpad_num + |
| 1092 | sizeof(*bt_drv) * plat_data->button_num, GFP_KERNEL); |
| 1093 | if (!ad714x) { |
| 1094 | error = -ENOMEM; |
| 1095 | goto err_out; |
| 1096 | } |
| 1097 | |
| 1098 | ad714x->hw = plat_data; |
| 1099 | |
| 1100 | drv_mem = ad714x + 1; |
| 1101 | ad714x->sw = drv_mem; |
| 1102 | drv_mem += sizeof(*ad714x->sw); |
| 1103 | ad714x->sw->slider = sd_drv = drv_mem; |
| 1104 | drv_mem += sizeof(*sd_drv) * ad714x->hw->slider_num; |
| 1105 | ad714x->sw->wheel = wl_drv = drv_mem; |
| 1106 | drv_mem += sizeof(*wl_drv) * ad714x->hw->wheel_num; |
| 1107 | ad714x->sw->touchpad = tp_drv = drv_mem; |
| 1108 | drv_mem += sizeof(*tp_drv) * ad714x->hw->touchpad_num; |
| 1109 | ad714x->sw->button = bt_drv = drv_mem; |
| 1110 | drv_mem += sizeof(*bt_drv) * ad714x->hw->button_num; |
| 1111 | |
| 1112 | ad714x->read = read; |
| 1113 | ad714x->write = write; |
| 1114 | ad714x->irq = irq; |
| 1115 | ad714x->dev = dev; |
| 1116 | |
| 1117 | error = ad714x_hw_detect(ad714x); |
| 1118 | if (error) |
| 1119 | goto err_free_mem; |
| 1120 | |
| 1121 | /* initilize and request sw/hw resources */ |
| 1122 | |
| 1123 | ad714x_hw_init(ad714x); |
| 1124 | mutex_init(&ad714x->mutex); |
| 1125 | |
| 1126 | /* |
| 1127 | * Allocate and register AD714X input device |
| 1128 | */ |
| 1129 | alloc_idx = 0; |
| 1130 | |
| 1131 | /* a slider uses one input_dev instance */ |
| 1132 | if (ad714x->hw->slider_num > 0) { |
| 1133 | struct ad714x_slider_plat *sd_plat = ad714x->hw->slider; |
| 1134 | |
| 1135 | for (i = 0; i < ad714x->hw->slider_num; i++) { |
| 1136 | sd_drv[i].input = input[alloc_idx] = input_allocate_device(); |
| 1137 | if (!input[alloc_idx]) { |
| 1138 | error = -ENOMEM; |
| 1139 | goto err_free_dev; |
| 1140 | } |
| 1141 | |
| 1142 | __set_bit(EV_ABS, input[alloc_idx]->evbit); |
| 1143 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1144 | __set_bit(ABS_X, input[alloc_idx]->absbit); |
| 1145 | __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); |
| 1146 | input_set_abs_params(input[alloc_idx], |
| 1147 | ABS_X, 0, sd_plat->max_coord, 0, 0); |
| 1148 | |
| 1149 | input[alloc_idx]->id.bustype = bus_type; |
| 1150 | input[alloc_idx]->id.product = ad714x->product; |
| 1151 | input[alloc_idx]->id.version = ad714x->version; |
| 1152 | |
| 1153 | error = input_register_device(input[alloc_idx]); |
| 1154 | if (error) |
| 1155 | goto err_free_dev; |
| 1156 | |
| 1157 | alloc_idx++; |
| 1158 | } |
| 1159 | } |
| 1160 | |
| 1161 | /* a wheel uses one input_dev instance */ |
| 1162 | if (ad714x->hw->wheel_num > 0) { |
| 1163 | struct ad714x_wheel_plat *wl_plat = ad714x->hw->wheel; |
| 1164 | |
| 1165 | for (i = 0; i < ad714x->hw->wheel_num; i++) { |
| 1166 | wl_drv[i].input = input[alloc_idx] = input_allocate_device(); |
| 1167 | if (!input[alloc_idx]) { |
| 1168 | error = -ENOMEM; |
| 1169 | goto err_free_dev; |
| 1170 | } |
| 1171 | |
| 1172 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1173 | __set_bit(EV_ABS, input[alloc_idx]->evbit); |
| 1174 | __set_bit(ABS_WHEEL, input[alloc_idx]->absbit); |
| 1175 | __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); |
| 1176 | input_set_abs_params(input[alloc_idx], |
| 1177 | ABS_WHEEL, 0, wl_plat->max_coord, 0, 0); |
| 1178 | |
| 1179 | input[alloc_idx]->id.bustype = bus_type; |
| 1180 | input[alloc_idx]->id.product = ad714x->product; |
| 1181 | input[alloc_idx]->id.version = ad714x->version; |
| 1182 | |
| 1183 | error = input_register_device(input[alloc_idx]); |
| 1184 | if (error) |
| 1185 | goto err_free_dev; |
| 1186 | |
| 1187 | alloc_idx++; |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | /* a touchpad uses one input_dev instance */ |
| 1192 | if (ad714x->hw->touchpad_num > 0) { |
| 1193 | struct ad714x_touchpad_plat *tp_plat = ad714x->hw->touchpad; |
| 1194 | |
| 1195 | for (i = 0; i < ad714x->hw->touchpad_num; i++) { |
| 1196 | tp_drv[i].input = input[alloc_idx] = input_allocate_device(); |
| 1197 | if (!input[alloc_idx]) { |
| 1198 | error = -ENOMEM; |
| 1199 | goto err_free_dev; |
| 1200 | } |
| 1201 | |
| 1202 | __set_bit(EV_ABS, input[alloc_idx]->evbit); |
| 1203 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1204 | __set_bit(ABS_X, input[alloc_idx]->absbit); |
| 1205 | __set_bit(ABS_Y, input[alloc_idx]->absbit); |
| 1206 | __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); |
| 1207 | input_set_abs_params(input[alloc_idx], |
| 1208 | ABS_X, 0, tp_plat->x_max_coord, 0, 0); |
| 1209 | input_set_abs_params(input[alloc_idx], |
| 1210 | ABS_Y, 0, tp_plat->y_max_coord, 0, 0); |
| 1211 | |
| 1212 | input[alloc_idx]->id.bustype = bus_type; |
| 1213 | input[alloc_idx]->id.product = ad714x->product; |
| 1214 | input[alloc_idx]->id.version = ad714x->version; |
| 1215 | |
| 1216 | error = input_register_device(input[alloc_idx]); |
| 1217 | if (error) |
| 1218 | goto err_free_dev; |
| 1219 | |
| 1220 | alloc_idx++; |
| 1221 | } |
| 1222 | } |
| 1223 | |
| 1224 | /* all buttons use one input node */ |
| 1225 | if (ad714x->hw->button_num > 0) { |
| 1226 | struct ad714x_button_plat *bt_plat = ad714x->hw->button; |
| 1227 | |
| 1228 | input[alloc_idx] = input_allocate_device(); |
| 1229 | if (!input[alloc_idx]) { |
| 1230 | error = -ENOMEM; |
| 1231 | goto err_free_dev; |
| 1232 | } |
| 1233 | |
| 1234 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1235 | for (i = 0; i < ad714x->hw->button_num; i++) { |
| 1236 | bt_drv[i].input = input[alloc_idx]; |
| 1237 | __set_bit(bt_plat[i].keycode, input[alloc_idx]->keybit); |
| 1238 | } |
| 1239 | |
| 1240 | input[alloc_idx]->id.bustype = bus_type; |
| 1241 | input[alloc_idx]->id.product = ad714x->product; |
| 1242 | input[alloc_idx]->id.version = ad714x->version; |
| 1243 | |
| 1244 | error = input_register_device(input[alloc_idx]); |
| 1245 | if (error) |
| 1246 | goto err_free_dev; |
| 1247 | |
| 1248 | alloc_idx++; |
| 1249 | } |
| 1250 | |
| 1251 | error = request_threaded_irq(ad714x->irq, NULL, ad714x_interrupt_thread, |
| 1252 | IRQF_TRIGGER_FALLING, "ad714x_captouch", ad714x); |
| 1253 | if (error) { |
| 1254 | dev_err(dev, "can't allocate irq %d\n", ad714x->irq); |
| 1255 | goto err_unreg_dev; |
| 1256 | } |
| 1257 | |
| 1258 | return ad714x; |
| 1259 | |
| 1260 | err_free_dev: |
| 1261 | dev_err(dev, "failed to setup AD714x input device %i\n", alloc_idx); |
| 1262 | input_free_device(input[alloc_idx]); |
| 1263 | err_unreg_dev: |
| 1264 | while (--alloc_idx >= 0) |
| 1265 | input_unregister_device(input[alloc_idx]); |
| 1266 | err_free_mem: |
| 1267 | kfree(ad714x); |
| 1268 | err_out: |
| 1269 | return ERR_PTR(error); |
| 1270 | } |
| 1271 | EXPORT_SYMBOL(ad714x_probe); |
| 1272 | |
| 1273 | void ad714x_remove(struct ad714x_chip *ad714x) |
| 1274 | { |
| 1275 | struct ad714x_platform_data *hw = ad714x->hw; |
| 1276 | struct ad714x_driver_data *sw = ad714x->sw; |
| 1277 | int i; |
| 1278 | |
| 1279 | free_irq(ad714x->irq, ad714x); |
| 1280 | |
| 1281 | /* unregister and free all input devices */ |
| 1282 | |
| 1283 | for (i = 0; i < hw->slider_num; i++) |
| 1284 | input_unregister_device(sw->slider[i].input); |
| 1285 | |
| 1286 | for (i = 0; i < hw->wheel_num; i++) |
| 1287 | input_unregister_device(sw->wheel[i].input); |
| 1288 | |
| 1289 | for (i = 0; i < hw->touchpad_num; i++) |
| 1290 | input_unregister_device(sw->touchpad[i].input); |
| 1291 | |
| 1292 | if (hw->button_num) |
| 1293 | input_unregister_device(sw->button[0].input); |
| 1294 | |
| 1295 | kfree(ad714x); |
| 1296 | } |
| 1297 | EXPORT_SYMBOL(ad714x_remove); |
| 1298 | |
| 1299 | #ifdef CONFIG_PM |
| 1300 | int ad714x_disable(struct ad714x_chip *ad714x) |
| 1301 | { |
| 1302 | unsigned short data; |
| 1303 | |
| 1304 | dev_dbg(ad714x->dev, "%s enter\n", __func__); |
| 1305 | |
| 1306 | mutex_lock(&ad714x->mutex); |
| 1307 | |
| 1308 | data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3; |
| 1309 | ad714x->write(ad714x->dev, AD714X_PWR_CTRL, data); |
| 1310 | |
| 1311 | mutex_unlock(&ad714x->mutex); |
| 1312 | |
| 1313 | return 0; |
| 1314 | } |
| 1315 | EXPORT_SYMBOL(ad714x_disable); |
| 1316 | |
| 1317 | int ad714x_enable(struct ad714x_chip *ad714x) |
| 1318 | { |
| 1319 | unsigned short data; |
| 1320 | |
| 1321 | dev_dbg(ad714x->dev, "%s enter\n", __func__); |
| 1322 | |
| 1323 | mutex_lock(&ad714x->mutex); |
| 1324 | |
| 1325 | /* resume to non-shutdown mode */ |
| 1326 | |
| 1327 | ad714x->write(ad714x->dev, AD714X_PWR_CTRL, |
| 1328 | ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]); |
| 1329 | |
| 1330 | /* make sure the interrupt output line is not low level after resume, |
| 1331 | * otherwise we will get no chance to enter falling-edge irq again |
| 1332 | */ |
| 1333 | |
| 1334 | ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &data); |
| 1335 | ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data); |
| 1336 | ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data); |
| 1337 | |
| 1338 | mutex_unlock(&ad714x->mutex); |
| 1339 | |
| 1340 | return 0; |
| 1341 | } |
| 1342 | EXPORT_SYMBOL(ad714x_enable); |
| 1343 | #endif |
| 1344 | |
| 1345 | MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver"); |
| 1346 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| 1347 | MODULE_LICENSE("GPL"); |