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 | * |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 4 | * Copyright 2009-2011 Analog Devices Inc. |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | */ |
| 68 | enum ad714x_device_state { IDLE, JITTER, ACTIVE, SPACE }; |
| 69 | |
| 70 | struct 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 | |
| 78 | struct ad714x_wheel_drv { |
| 79 | int abs_pos; |
| 80 | int flt_pos; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 81 | int pre_highest_stage; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 82 | int highest_stage; |
| 83 | enum ad714x_device_state state; |
| 84 | struct input_dev *input; |
| 85 | }; |
| 86 | |
| 87 | struct 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 | |
| 106 | struct 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 | |
| 115 | struct 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 | */ |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 126 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 127 | static 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 | |
Michael Hennerich | e223cc7 | 2011-05-16 23:17:23 -0700 | [diff] [blame] | 133 | mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 134 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 135 | ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1); |
Michael Hennerich | e223cc7 | 2011-05-16 23:17:23 -0700 | [diff] [blame] | 136 | data |= 1 << end_stage; |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 137 | ad714x->write(ad714x, STG_COM_INT_EN_REG, data); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 138 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 139 | ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 140 | data &= ~mask; |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 141 | ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | static 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 | |
Michael Hennerich | e223cc7 | 2011-05-16 23:17:23 -0700 | [diff] [blame] | 150 | mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 151 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 152 | ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1); |
Michael Hennerich | e223cc7 | 2011-05-16 23:17:23 -0700 | [diff] [blame] | 153 | data &= ~(1 << end_stage); |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 154 | ad714x->write(ad714x, STG_COM_INT_EN_REG, data); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 155 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 156 | ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 157 | data |= mask; |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 158 | ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static 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 | |
| 178 | static 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 | */ |
| 214 | static 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 | */ |
| 249 | static 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 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 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); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 257 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 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]); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 264 | } |
| 265 | } |
| 266 | |
| 267 | static 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 | */ |
| 292 | static 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 | */ |
| 314 | static 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 | |
| 325 | static 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 | |
| 332 | static 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 | |
| 339 | static 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); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | */ |
| 408 | static 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 | |
| 421 | static 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 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 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 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 430 | for (i = hw->start_stage; i <= hw->end_stage; i++) { |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 431 | ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 432 | &ad714x->amb_reg[i], 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 433 | if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 434 | ad714x->sensor_val[i] = |
| 435 | ad714x->adc_reg[i] - ad714x->amb_reg[i]; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 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 |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 446 | * sensor with the highest response and we apply weights to these sensors. The |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 447 | * result of this computation gives us the mean value. |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 448 | */ |
| 449 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 450 | static 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; |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 455 | int first_before, highest, first_after; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 456 | int a_param, b_param; |
| 457 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 461 | |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 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] + |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 469 | ad714x->sensor_val[first_before] + |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 470 | ad714x->sensor_val[first_after]; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 471 | |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 472 | sw->abs_pos = ((hw->max_coord / (hw->end_stage - hw->start_stage)) * |
| 473 | a_param) / b_param; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 474 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 475 | if (sw->abs_pos > hw->max_coord) |
| 476 | sw->abs_pos = hw->max_coord; |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 477 | else if (sw->abs_pos < 0) |
| 478 | sw->abs_pos = 0; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | static 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 | |
| 497 | static 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 | |
| 504 | static 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 | |
| 511 | static 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); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 552 | input_report_abs(sw->input, ABS_WHEEL, |
Michael Hennerich | f1e430e | 2011-05-16 23:17:40 -0700 | [diff] [blame] | 553 | sw->flt_pos); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | |
| 575 | static 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 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 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 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 584 | for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) { |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 585 | ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 586 | &ad714x->amb_reg[i], 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 587 | if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 588 | ad714x->sensor_val[i] = |
| 589 | ad714x->adc_reg[i] - ad714x->amb_reg[i]; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 590 | else |
| 591 | ad714x->sensor_val[i] = 0; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | static 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 | */ |
| 616 | static 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 | */ |
| 655 | static 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 | |
| 669 | static 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 |
| 700 | static 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 | |
| 777 | static 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 | |
| 784 | static 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 | |
| 792 | static 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 | |
| 871 | static int ad714x_hw_detect(struct ad714x_chip *ad714x) |
| 872 | { |
| 873 | unsigned short data; |
| 874 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 875 | ad714x->read(ad714x, AD714X_PARTID_REG, &data, 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 876 | switch (data & 0xFFF0) { |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | |
Barry Song | 6c04d7b | 2010-03-21 23:23:29 -0700 | [diff] [blame] | 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 | |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | |
| 913 | static 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++) |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 924 | ad714x->write(ad714x, reg_base + j, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 925 | ad714x->hw->stage_cfg_reg[i][j]); |
| 926 | } |
| 927 | |
| 928 | for (i = 0; i < SYS_CFGREG_NUM; i++) |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 929 | ad714x->write(ad714x, AD714X_SYSCFG_REG + i, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 930 | ad714x->hw->sys_cfg_reg[i]); |
| 931 | for (i = 0; i < SYS_CFGREG_NUM; i++) |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 932 | ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data, 1); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 933 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 934 | ad714x->write(ad714x, AD714X_STG_CAL_EN_REG, 0xFFF); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 935 | |
| 936 | /* clear all interrupts */ |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 937 | ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | static 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 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 947 | ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 |
| 964 | struct 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->platform_data; |
| 972 | struct ad714x_chip *ad714x; |
| 973 | void *drv_mem; |
| 974 | |
| 975 | struct ad714x_button_drv *bt_drv; |
| 976 | struct ad714x_slider_drv *sd_drv; |
| 977 | struct ad714x_wheel_drv *wl_drv; |
| 978 | struct ad714x_touchpad_drv *tp_drv; |
| 979 | |
| 980 | |
| 981 | if (irq <= 0) { |
| 982 | dev_err(dev, "IRQ not configured!\n"); |
| 983 | error = -EINVAL; |
| 984 | goto err_out; |
| 985 | } |
| 986 | |
| 987 | if (dev->platform_data == NULL) { |
| 988 | dev_err(dev, "platform data for ad714x doesn't exist\n"); |
| 989 | error = -EINVAL; |
| 990 | goto err_out; |
| 991 | } |
| 992 | |
| 993 | ad714x = kzalloc(sizeof(*ad714x) + sizeof(*ad714x->sw) + |
| 994 | sizeof(*sd_drv) * plat_data->slider_num + |
| 995 | sizeof(*wl_drv) * plat_data->wheel_num + |
| 996 | sizeof(*tp_drv) * plat_data->touchpad_num + |
| 997 | sizeof(*bt_drv) * plat_data->button_num, GFP_KERNEL); |
| 998 | if (!ad714x) { |
| 999 | error = -ENOMEM; |
| 1000 | goto err_out; |
| 1001 | } |
| 1002 | |
| 1003 | ad714x->hw = plat_data; |
| 1004 | |
| 1005 | drv_mem = ad714x + 1; |
| 1006 | ad714x->sw = drv_mem; |
| 1007 | drv_mem += sizeof(*ad714x->sw); |
| 1008 | ad714x->sw->slider = sd_drv = drv_mem; |
| 1009 | drv_mem += sizeof(*sd_drv) * ad714x->hw->slider_num; |
| 1010 | ad714x->sw->wheel = wl_drv = drv_mem; |
| 1011 | drv_mem += sizeof(*wl_drv) * ad714x->hw->wheel_num; |
| 1012 | ad714x->sw->touchpad = tp_drv = drv_mem; |
| 1013 | drv_mem += sizeof(*tp_drv) * ad714x->hw->touchpad_num; |
| 1014 | ad714x->sw->button = bt_drv = drv_mem; |
| 1015 | drv_mem += sizeof(*bt_drv) * ad714x->hw->button_num; |
| 1016 | |
| 1017 | ad714x->read = read; |
| 1018 | ad714x->write = write; |
| 1019 | ad714x->irq = irq; |
| 1020 | ad714x->dev = dev; |
| 1021 | |
| 1022 | error = ad714x_hw_detect(ad714x); |
| 1023 | if (error) |
| 1024 | goto err_free_mem; |
| 1025 | |
Uwe Kleine-König | 421f91d | 2010-06-11 12:17:00 +0200 | [diff] [blame] | 1026 | /* initialize and request sw/hw resources */ |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1027 | |
| 1028 | ad714x_hw_init(ad714x); |
| 1029 | mutex_init(&ad714x->mutex); |
| 1030 | |
| 1031 | /* |
| 1032 | * Allocate and register AD714X input device |
| 1033 | */ |
| 1034 | alloc_idx = 0; |
| 1035 | |
| 1036 | /* a slider uses one input_dev instance */ |
| 1037 | if (ad714x->hw->slider_num > 0) { |
| 1038 | struct ad714x_slider_plat *sd_plat = ad714x->hw->slider; |
| 1039 | |
| 1040 | for (i = 0; i < ad714x->hw->slider_num; i++) { |
| 1041 | sd_drv[i].input = input[alloc_idx] = input_allocate_device(); |
| 1042 | if (!input[alloc_idx]) { |
| 1043 | error = -ENOMEM; |
| 1044 | goto err_free_dev; |
| 1045 | } |
| 1046 | |
| 1047 | __set_bit(EV_ABS, input[alloc_idx]->evbit); |
| 1048 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1049 | __set_bit(ABS_X, input[alloc_idx]->absbit); |
| 1050 | __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); |
| 1051 | input_set_abs_params(input[alloc_idx], |
| 1052 | ABS_X, 0, sd_plat->max_coord, 0, 0); |
| 1053 | |
| 1054 | input[alloc_idx]->id.bustype = bus_type; |
| 1055 | input[alloc_idx]->id.product = ad714x->product; |
| 1056 | input[alloc_idx]->id.version = ad714x->version; |
Michael Hennerich | dc5f4f5 | 2011-05-16 23:17:11 -0700 | [diff] [blame] | 1057 | input[alloc_idx]->name = "ad714x_captouch_slider"; |
| 1058 | input[alloc_idx]->dev.parent = dev; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1059 | |
| 1060 | error = input_register_device(input[alloc_idx]); |
| 1061 | if (error) |
| 1062 | goto err_free_dev; |
| 1063 | |
| 1064 | alloc_idx++; |
| 1065 | } |
| 1066 | } |
| 1067 | |
| 1068 | /* a wheel uses one input_dev instance */ |
| 1069 | if (ad714x->hw->wheel_num > 0) { |
| 1070 | struct ad714x_wheel_plat *wl_plat = ad714x->hw->wheel; |
| 1071 | |
| 1072 | for (i = 0; i < ad714x->hw->wheel_num; i++) { |
| 1073 | wl_drv[i].input = input[alloc_idx] = input_allocate_device(); |
| 1074 | if (!input[alloc_idx]) { |
| 1075 | error = -ENOMEM; |
| 1076 | goto err_free_dev; |
| 1077 | } |
| 1078 | |
| 1079 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1080 | __set_bit(EV_ABS, input[alloc_idx]->evbit); |
| 1081 | __set_bit(ABS_WHEEL, input[alloc_idx]->absbit); |
| 1082 | __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); |
| 1083 | input_set_abs_params(input[alloc_idx], |
| 1084 | ABS_WHEEL, 0, wl_plat->max_coord, 0, 0); |
| 1085 | |
| 1086 | input[alloc_idx]->id.bustype = bus_type; |
| 1087 | input[alloc_idx]->id.product = ad714x->product; |
| 1088 | input[alloc_idx]->id.version = ad714x->version; |
Michael Hennerich | dc5f4f5 | 2011-05-16 23:17:11 -0700 | [diff] [blame] | 1089 | input[alloc_idx]->name = "ad714x_captouch_wheel"; |
| 1090 | input[alloc_idx]->dev.parent = dev; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1091 | |
| 1092 | error = input_register_device(input[alloc_idx]); |
| 1093 | if (error) |
| 1094 | goto err_free_dev; |
| 1095 | |
| 1096 | alloc_idx++; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | /* a touchpad uses one input_dev instance */ |
| 1101 | if (ad714x->hw->touchpad_num > 0) { |
| 1102 | struct ad714x_touchpad_plat *tp_plat = ad714x->hw->touchpad; |
| 1103 | |
| 1104 | for (i = 0; i < ad714x->hw->touchpad_num; i++) { |
| 1105 | tp_drv[i].input = input[alloc_idx] = input_allocate_device(); |
| 1106 | if (!input[alloc_idx]) { |
| 1107 | error = -ENOMEM; |
| 1108 | goto err_free_dev; |
| 1109 | } |
| 1110 | |
| 1111 | __set_bit(EV_ABS, input[alloc_idx]->evbit); |
| 1112 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1113 | __set_bit(ABS_X, input[alloc_idx]->absbit); |
| 1114 | __set_bit(ABS_Y, input[alloc_idx]->absbit); |
| 1115 | __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); |
| 1116 | input_set_abs_params(input[alloc_idx], |
| 1117 | ABS_X, 0, tp_plat->x_max_coord, 0, 0); |
| 1118 | input_set_abs_params(input[alloc_idx], |
| 1119 | ABS_Y, 0, tp_plat->y_max_coord, 0, 0); |
| 1120 | |
| 1121 | input[alloc_idx]->id.bustype = bus_type; |
| 1122 | input[alloc_idx]->id.product = ad714x->product; |
| 1123 | input[alloc_idx]->id.version = ad714x->version; |
Michael Hennerich | dc5f4f5 | 2011-05-16 23:17:11 -0700 | [diff] [blame] | 1124 | input[alloc_idx]->name = "ad714x_captouch_pad"; |
| 1125 | input[alloc_idx]->dev.parent = dev; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1126 | |
| 1127 | error = input_register_device(input[alloc_idx]); |
| 1128 | if (error) |
| 1129 | goto err_free_dev; |
| 1130 | |
| 1131 | alloc_idx++; |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | /* all buttons use one input node */ |
| 1136 | if (ad714x->hw->button_num > 0) { |
| 1137 | struct ad714x_button_plat *bt_plat = ad714x->hw->button; |
| 1138 | |
| 1139 | input[alloc_idx] = input_allocate_device(); |
| 1140 | if (!input[alloc_idx]) { |
| 1141 | error = -ENOMEM; |
| 1142 | goto err_free_dev; |
| 1143 | } |
| 1144 | |
| 1145 | __set_bit(EV_KEY, input[alloc_idx]->evbit); |
| 1146 | for (i = 0; i < ad714x->hw->button_num; i++) { |
| 1147 | bt_drv[i].input = input[alloc_idx]; |
| 1148 | __set_bit(bt_plat[i].keycode, input[alloc_idx]->keybit); |
| 1149 | } |
| 1150 | |
| 1151 | input[alloc_idx]->id.bustype = bus_type; |
| 1152 | input[alloc_idx]->id.product = ad714x->product; |
| 1153 | input[alloc_idx]->id.version = ad714x->version; |
Michael Hennerich | dc5f4f5 | 2011-05-16 23:17:11 -0700 | [diff] [blame] | 1154 | input[alloc_idx]->name = "ad714x_captouch_button"; |
| 1155 | input[alloc_idx]->dev.parent = dev; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1156 | |
| 1157 | error = input_register_device(input[alloc_idx]); |
| 1158 | if (error) |
| 1159 | goto err_free_dev; |
| 1160 | |
| 1161 | alloc_idx++; |
| 1162 | } |
| 1163 | |
| 1164 | error = request_threaded_irq(ad714x->irq, NULL, ad714x_interrupt_thread, |
Michael Hennerich | 3532cb0 | 2011-05-16 23:17:34 -0700 | [diff] [blame] | 1165 | plat_data->irqflags ? |
| 1166 | plat_data->irqflags : IRQF_TRIGGER_FALLING, |
| 1167 | "ad714x_captouch", ad714x); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1168 | if (error) { |
| 1169 | dev_err(dev, "can't allocate irq %d\n", ad714x->irq); |
| 1170 | goto err_unreg_dev; |
| 1171 | } |
| 1172 | |
| 1173 | return ad714x; |
| 1174 | |
| 1175 | err_free_dev: |
| 1176 | dev_err(dev, "failed to setup AD714x input device %i\n", alloc_idx); |
| 1177 | input_free_device(input[alloc_idx]); |
| 1178 | err_unreg_dev: |
| 1179 | while (--alloc_idx >= 0) |
| 1180 | input_unregister_device(input[alloc_idx]); |
| 1181 | err_free_mem: |
| 1182 | kfree(ad714x); |
| 1183 | err_out: |
| 1184 | return ERR_PTR(error); |
| 1185 | } |
| 1186 | EXPORT_SYMBOL(ad714x_probe); |
| 1187 | |
| 1188 | void ad714x_remove(struct ad714x_chip *ad714x) |
| 1189 | { |
| 1190 | struct ad714x_platform_data *hw = ad714x->hw; |
| 1191 | struct ad714x_driver_data *sw = ad714x->sw; |
| 1192 | int i; |
| 1193 | |
| 1194 | free_irq(ad714x->irq, ad714x); |
| 1195 | |
| 1196 | /* unregister and free all input devices */ |
| 1197 | |
| 1198 | for (i = 0; i < hw->slider_num; i++) |
| 1199 | input_unregister_device(sw->slider[i].input); |
| 1200 | |
| 1201 | for (i = 0; i < hw->wheel_num; i++) |
| 1202 | input_unregister_device(sw->wheel[i].input); |
| 1203 | |
| 1204 | for (i = 0; i < hw->touchpad_num; i++) |
| 1205 | input_unregister_device(sw->touchpad[i].input); |
| 1206 | |
| 1207 | if (hw->button_num) |
| 1208 | input_unregister_device(sw->button[0].input); |
| 1209 | |
| 1210 | kfree(ad714x); |
| 1211 | } |
| 1212 | EXPORT_SYMBOL(ad714x_remove); |
| 1213 | |
| 1214 | #ifdef CONFIG_PM |
| 1215 | int ad714x_disable(struct ad714x_chip *ad714x) |
| 1216 | { |
| 1217 | unsigned short data; |
| 1218 | |
| 1219 | dev_dbg(ad714x->dev, "%s enter\n", __func__); |
| 1220 | |
| 1221 | mutex_lock(&ad714x->mutex); |
| 1222 | |
| 1223 | data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3; |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 1224 | ad714x->write(ad714x, AD714X_PWR_CTRL, data); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1225 | |
| 1226 | mutex_unlock(&ad714x->mutex); |
| 1227 | |
| 1228 | return 0; |
| 1229 | } |
| 1230 | EXPORT_SYMBOL(ad714x_disable); |
| 1231 | |
| 1232 | int ad714x_enable(struct ad714x_chip *ad714x) |
| 1233 | { |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1234 | dev_dbg(ad714x->dev, "%s enter\n", __func__); |
| 1235 | |
| 1236 | mutex_lock(&ad714x->mutex); |
| 1237 | |
| 1238 | /* resume to non-shutdown mode */ |
| 1239 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 1240 | ad714x->write(ad714x, AD714X_PWR_CTRL, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1241 | ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]); |
| 1242 | |
| 1243 | /* make sure the interrupt output line is not low level after resume, |
| 1244 | * otherwise we will get no chance to enter falling-edge irq again |
| 1245 | */ |
| 1246 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 1247 | ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1248 | |
| 1249 | mutex_unlock(&ad714x->mutex); |
| 1250 | |
| 1251 | return 0; |
| 1252 | } |
| 1253 | EXPORT_SYMBOL(ad714x_enable); |
| 1254 | #endif |
| 1255 | |
| 1256 | MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver"); |
| 1257 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| 1258 | MODULE_LICENSE("GPL"); |