| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * AD7879/AD7889 based touchscreen and GPIO driver |
| 4 | * |
| 5 | * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. |
| 6 | * |
| 7 | * History: |
| 8 | * Copyright (c) 2005 David Brownell |
| 9 | * Copyright (c) 2006 Nokia Corporation |
| 10 | * Various changes: Imre Deak <imre.deak@nokia.com> |
| 11 | * |
| 12 | * Using code from: |
| 13 | * - corgi_ts.c |
| 14 | * Copyright (C) 2004-2005 Richard Purdie |
| 15 | * - omap_ts.[hc], ads7846.h, ts_osk.c |
| 16 | * Copyright (C) 2002 MontaVista Software |
| 17 | * Copyright (C) 2004 Texas Instruments |
| 18 | * Copyright (C) 2005 Dirk Behme |
| 19 | * - ad7877.c |
| 20 | * Copyright (C) 2006-2008 Analog Devices Inc. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/device.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/input.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/irq.h> |
| 28 | #include <linux/property.h> |
| 29 | #include <linux/regmap.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/gpio/driver.h> |
| 32 | |
| 33 | #include <linux/input/touchscreen.h> |
| 34 | #include <linux/module.h> |
| 35 | #include "ad7879.h" |
| 36 | |
| 37 | #define AD7879_REG_ZEROS 0 |
| 38 | #define AD7879_REG_CTRL1 1 |
| 39 | #define AD7879_REG_CTRL2 2 |
| 40 | #define AD7879_REG_CTRL3 3 |
| 41 | #define AD7879_REG_AUX1HIGH 4 |
| 42 | #define AD7879_REG_AUX1LOW 5 |
| 43 | #define AD7879_REG_TEMP1HIGH 6 |
| 44 | #define AD7879_REG_TEMP1LOW 7 |
| 45 | #define AD7879_REG_XPLUS 8 |
| 46 | #define AD7879_REG_YPLUS 9 |
| 47 | #define AD7879_REG_Z1 10 |
| 48 | #define AD7879_REG_Z2 11 |
| 49 | #define AD7879_REG_AUXVBAT 12 |
| 50 | #define AD7879_REG_TEMP 13 |
| 51 | #define AD7879_REG_REVID 14 |
| 52 | |
| 53 | /* Control REG 1 */ |
| 54 | #define AD7879_TMR(x) ((x & 0xFF) << 0) |
| 55 | #define AD7879_ACQ(x) ((x & 0x3) << 8) |
| 56 | #define AD7879_MODE_NOC (0 << 10) /* Do not convert */ |
| 57 | #define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */ |
| 58 | #define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */ |
| 59 | #define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */ |
| 60 | #define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */ |
| 61 | |
| 62 | /* Control REG 2 */ |
| 63 | #define AD7879_FCD(x) ((x & 0x3) << 0) |
| 64 | #define AD7879_RESET (1 << 4) |
| 65 | #define AD7879_MFS(x) ((x & 0x3) << 5) |
| 66 | #define AD7879_AVG(x) ((x & 0x3) << 7) |
| 67 | #define AD7879_SER (1 << 9) /* non-differential */ |
| 68 | #define AD7879_DFR (0 << 9) /* differential */ |
| 69 | #define AD7879_GPIOPOL (1 << 10) |
| 70 | #define AD7879_GPIODIR (1 << 11) |
| 71 | #define AD7879_GPIO_DATA (1 << 12) |
| 72 | #define AD7879_GPIO_EN (1 << 13) |
| 73 | #define AD7879_PM(x) ((x & 0x3) << 14) |
| 74 | #define AD7879_PM_SHUTDOWN (0) |
| 75 | #define AD7879_PM_DYN (1) |
| 76 | #define AD7879_PM_FULLON (2) |
| 77 | |
| 78 | /* Control REG 3 */ |
| 79 | #define AD7879_TEMPMASK_BIT (1<<15) |
| 80 | #define AD7879_AUXVBATMASK_BIT (1<<14) |
| 81 | #define AD7879_INTMODE_BIT (1<<13) |
| 82 | #define AD7879_GPIOALERTMASK_BIT (1<<12) |
| 83 | #define AD7879_AUXLOW_BIT (1<<11) |
| 84 | #define AD7879_AUXHIGH_BIT (1<<10) |
| 85 | #define AD7879_TEMPLOW_BIT (1<<9) |
| 86 | #define AD7879_TEMPHIGH_BIT (1<<8) |
| 87 | #define AD7879_YPLUS_BIT (1<<7) |
| 88 | #define AD7879_XPLUS_BIT (1<<6) |
| 89 | #define AD7879_Z1_BIT (1<<5) |
| 90 | #define AD7879_Z2_BIT (1<<4) |
| 91 | #define AD7879_AUX_BIT (1<<3) |
| 92 | #define AD7879_VBAT_BIT (1<<2) |
| 93 | #define AD7879_TEMP_BIT (1<<1) |
| 94 | |
| 95 | enum { |
| 96 | AD7879_SEQ_YPOS = 0, |
| 97 | AD7879_SEQ_XPOS = 1, |
| 98 | AD7879_SEQ_Z1 = 2, |
| 99 | AD7879_SEQ_Z2 = 3, |
| 100 | AD7879_NR_SENSE = 4, |
| 101 | }; |
| 102 | |
| 103 | #define MAX_12BIT ((1<<12)-1) |
| 104 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50) |
| 105 | |
| 106 | struct ad7879 { |
| 107 | struct regmap *regmap; |
| 108 | struct device *dev; |
| 109 | struct input_dev *input; |
| 110 | struct timer_list timer; |
| 111 | #ifdef CONFIG_GPIOLIB |
| 112 | struct gpio_chip gc; |
| 113 | struct mutex mutex; |
| 114 | #endif |
| 115 | unsigned int irq; |
| 116 | bool disabled; /* P: input->mutex */ |
| 117 | bool suspended; /* P: input->mutex */ |
| 118 | bool swap_xy; |
| 119 | u16 conversion_data[AD7879_NR_SENSE]; |
| 120 | char phys[32]; |
| 121 | u8 first_conversion_delay; |
| 122 | u8 acquisition_time; |
| 123 | u8 averaging; |
| 124 | u8 pen_down_acc_interval; |
| 125 | u8 median; |
| 126 | u16 x_plate_ohms; |
| 127 | u16 cmd_crtl1; |
| 128 | u16 cmd_crtl2; |
| 129 | u16 cmd_crtl3; |
| 130 | int x; |
| 131 | int y; |
| 132 | int Rt; |
| 133 | }; |
| 134 | |
| 135 | static int ad7879_read(struct ad7879 *ts, u8 reg) |
| 136 | { |
| 137 | unsigned int val; |
| 138 | int error; |
| 139 | |
| 140 | error = regmap_read(ts->regmap, reg, &val); |
| 141 | if (error) { |
| 142 | dev_err(ts->dev, "failed to read register %#02x: %d\n", |
| 143 | reg, error); |
| 144 | return error; |
| 145 | } |
| 146 | |
| 147 | return val; |
| 148 | } |
| 149 | |
| 150 | static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val) |
| 151 | { |
| 152 | int error; |
| 153 | |
| 154 | error = regmap_write(ts->regmap, reg, val); |
| 155 | if (error) { |
| 156 | dev_err(ts->dev, |
| 157 | "failed to write %#04x to register %#02x: %d\n", |
| 158 | val, reg, error); |
| 159 | return error; |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static int ad7879_report(struct ad7879 *ts) |
| 166 | { |
| 167 | struct input_dev *input_dev = ts->input; |
| 168 | unsigned Rt; |
| 169 | u16 x, y, z1, z2; |
| 170 | |
| 171 | x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT; |
| 172 | y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT; |
| 173 | z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT; |
| 174 | z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT; |
| 175 | |
| 176 | if (ts->swap_xy) |
| 177 | swap(x, y); |
| 178 | |
| 179 | /* |
| 180 | * The samples processed here are already preprocessed by the AD7879. |
| 181 | * The preprocessing function consists of a median and an averaging |
| 182 | * filter. The combination of these two techniques provides a robust |
| 183 | * solution, discarding the spurious noise in the signal and keeping |
| 184 | * only the data of interest. The size of both filters is |
| 185 | * programmable. (dev.platform_data, see linux/platform_data/ad7879.h) |
| 186 | * Other user-programmable conversion controls include variable |
| 187 | * acquisition time, and first conversion delay. Up to 16 averages can |
| 188 | * be taken per conversion. |
| 189 | */ |
| 190 | |
| 191 | if (likely(x && z1)) { |
| 192 | /* compute touch pressure resistance using equation #1 */ |
| 193 | Rt = (z2 - z1) * x * ts->x_plate_ohms; |
| 194 | Rt /= z1; |
| 195 | Rt = (Rt + 2047) >> 12; |
| 196 | |
| 197 | /* |
| 198 | * Sample found inconsistent, pressure is beyond |
| 199 | * the maximum. Don't report it to user space. |
| 200 | */ |
| 201 | if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE)) |
| 202 | return -EINVAL; |
| 203 | |
| 204 | /* |
| 205 | * Note that we delay reporting events by one sample. |
| 206 | * This is done to avoid reporting last sample of the |
| 207 | * touch sequence, which may be incomplete if finger |
| 208 | * leaves the surface before last reading is taken. |
| 209 | */ |
| 210 | if (timer_pending(&ts->timer)) { |
| 211 | /* Touch continues */ |
| 212 | input_report_key(input_dev, BTN_TOUCH, 1); |
| 213 | input_report_abs(input_dev, ABS_X, ts->x); |
| 214 | input_report_abs(input_dev, ABS_Y, ts->y); |
| 215 | input_report_abs(input_dev, ABS_PRESSURE, ts->Rt); |
| 216 | input_sync(input_dev); |
| 217 | } |
| 218 | |
| 219 | ts->x = x; |
| 220 | ts->y = y; |
| 221 | ts->Rt = Rt; |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | return -EINVAL; |
| 227 | } |
| 228 | |
| 229 | static void ad7879_ts_event_release(struct ad7879 *ts) |
| 230 | { |
| 231 | struct input_dev *input_dev = ts->input; |
| 232 | |
| 233 | input_report_abs(input_dev, ABS_PRESSURE, 0); |
| 234 | input_report_key(input_dev, BTN_TOUCH, 0); |
| 235 | input_sync(input_dev); |
| 236 | } |
| 237 | |
| 238 | static void ad7879_timer(struct timer_list *t) |
| 239 | { |
| 240 | struct ad7879 *ts = from_timer(ts, t, timer); |
| 241 | |
| 242 | ad7879_ts_event_release(ts); |
| 243 | } |
| 244 | |
| 245 | static irqreturn_t ad7879_irq(int irq, void *handle) |
| 246 | { |
| 247 | struct ad7879 *ts = handle; |
| 248 | int error; |
| 249 | |
| 250 | error = regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS, |
| 251 | ts->conversion_data, AD7879_NR_SENSE); |
| 252 | if (error) |
| 253 | dev_err_ratelimited(ts->dev, "failed to read %#02x: %d\n", |
| 254 | AD7879_REG_XPLUS, error); |
| 255 | else if (!ad7879_report(ts)) |
| 256 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); |
| 257 | |
| 258 | return IRQ_HANDLED; |
| 259 | } |
| 260 | |
| 261 | static void __ad7879_enable(struct ad7879 *ts) |
| 262 | { |
| 263 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
| 264 | ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3); |
| 265 | ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1); |
| 266 | |
| 267 | enable_irq(ts->irq); |
| 268 | } |
| 269 | |
| 270 | static void __ad7879_disable(struct ad7879 *ts) |
| 271 | { |
| 272 | u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) | |
| 273 | AD7879_PM(AD7879_PM_SHUTDOWN); |
| 274 | disable_irq(ts->irq); |
| 275 | |
| 276 | if (del_timer_sync(&ts->timer)) |
| 277 | ad7879_ts_event_release(ts); |
| 278 | |
| 279 | ad7879_write(ts, AD7879_REG_CTRL2, reg); |
| 280 | } |
| 281 | |
| 282 | |
| 283 | static int ad7879_open(struct input_dev *input) |
| 284 | { |
| 285 | struct ad7879 *ts = input_get_drvdata(input); |
| 286 | |
| 287 | /* protected by input->mutex */ |
| 288 | if (!ts->disabled && !ts->suspended) |
| 289 | __ad7879_enable(ts); |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | static void ad7879_close(struct input_dev *input) |
| 295 | { |
| 296 | struct ad7879 *ts = input_get_drvdata(input); |
| 297 | |
| 298 | /* protected by input->mutex */ |
| 299 | if (!ts->disabled && !ts->suspended) |
| 300 | __ad7879_disable(ts); |
| 301 | } |
| 302 | |
| 303 | static int __maybe_unused ad7879_suspend(struct device *dev) |
| 304 | { |
| 305 | struct ad7879 *ts = dev_get_drvdata(dev); |
| 306 | |
| 307 | mutex_lock(&ts->input->mutex); |
| 308 | |
| 309 | if (!ts->suspended && !ts->disabled && input_device_enabled(ts->input)) |
| 310 | __ad7879_disable(ts); |
| 311 | |
| 312 | ts->suspended = true; |
| 313 | |
| 314 | mutex_unlock(&ts->input->mutex); |
| 315 | |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | static int __maybe_unused ad7879_resume(struct device *dev) |
| 320 | { |
| 321 | struct ad7879 *ts = dev_get_drvdata(dev); |
| 322 | |
| 323 | mutex_lock(&ts->input->mutex); |
| 324 | |
| 325 | if (ts->suspended && !ts->disabled && input_device_enabled(ts->input)) |
| 326 | __ad7879_enable(ts); |
| 327 | |
| 328 | ts->suspended = false; |
| 329 | |
| 330 | mutex_unlock(&ts->input->mutex); |
| 331 | |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume); |
| 336 | EXPORT_SYMBOL(ad7879_pm_ops); |
| 337 | |
| 338 | static void ad7879_toggle(struct ad7879 *ts, bool disable) |
| 339 | { |
| 340 | mutex_lock(&ts->input->mutex); |
| 341 | |
| 342 | if (!ts->suspended && input_device_enabled(ts->input)) { |
| 343 | |
| 344 | if (disable) { |
| 345 | if (ts->disabled) |
| 346 | __ad7879_enable(ts); |
| 347 | } else { |
| 348 | if (!ts->disabled) |
| 349 | __ad7879_disable(ts); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | ts->disabled = disable; |
| 354 | |
| 355 | mutex_unlock(&ts->input->mutex); |
| 356 | } |
| 357 | |
| 358 | static ssize_t ad7879_disable_show(struct device *dev, |
| 359 | struct device_attribute *attr, char *buf) |
| 360 | { |
| 361 | struct ad7879 *ts = dev_get_drvdata(dev); |
| 362 | |
| 363 | return sprintf(buf, "%u\n", ts->disabled); |
| 364 | } |
| 365 | |
| 366 | static ssize_t ad7879_disable_store(struct device *dev, |
| 367 | struct device_attribute *attr, |
| 368 | const char *buf, size_t count) |
| 369 | { |
| 370 | struct ad7879 *ts = dev_get_drvdata(dev); |
| 371 | unsigned int val; |
| 372 | int error; |
| 373 | |
| 374 | error = kstrtouint(buf, 10, &val); |
| 375 | if (error) |
| 376 | return error; |
| 377 | |
| 378 | ad7879_toggle(ts, val); |
| 379 | |
| 380 | return count; |
| 381 | } |
| 382 | |
| 383 | static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store); |
| 384 | |
| 385 | static struct attribute *ad7879_attributes[] = { |
| 386 | &dev_attr_disable.attr, |
| 387 | NULL |
| 388 | }; |
| 389 | |
| 390 | static const struct attribute_group ad7879_attr_group = { |
| 391 | .attrs = ad7879_attributes, |
| 392 | }; |
| 393 | |
| 394 | const struct attribute_group *ad7879_groups[] = { |
| 395 | &ad7879_attr_group, |
| 396 | NULL |
| 397 | }; |
| 398 | EXPORT_SYMBOL_GPL(ad7879_groups); |
| 399 | |
| 400 | #ifdef CONFIG_GPIOLIB |
| 401 | static int ad7879_gpio_direction_input(struct gpio_chip *chip, |
| 402 | unsigned gpio) |
| 403 | { |
| 404 | struct ad7879 *ts = gpiochip_get_data(chip); |
| 405 | int err; |
| 406 | |
| 407 | mutex_lock(&ts->mutex); |
| 408 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL; |
| 409 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
| 410 | mutex_unlock(&ts->mutex); |
| 411 | |
| 412 | return err; |
| 413 | } |
| 414 | |
| 415 | static int ad7879_gpio_direction_output(struct gpio_chip *chip, |
| 416 | unsigned gpio, int level) |
| 417 | { |
| 418 | struct ad7879 *ts = gpiochip_get_data(chip); |
| 419 | int err; |
| 420 | |
| 421 | mutex_lock(&ts->mutex); |
| 422 | ts->cmd_crtl2 &= ~AD7879_GPIODIR; |
| 423 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL; |
| 424 | if (level) |
| 425 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; |
| 426 | else |
| 427 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; |
| 428 | |
| 429 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
| 430 | mutex_unlock(&ts->mutex); |
| 431 | |
| 432 | return err; |
| 433 | } |
| 434 | |
| 435 | static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio) |
| 436 | { |
| 437 | struct ad7879 *ts = gpiochip_get_data(chip); |
| 438 | u16 val; |
| 439 | |
| 440 | mutex_lock(&ts->mutex); |
| 441 | val = ad7879_read(ts, AD7879_REG_CTRL2); |
| 442 | mutex_unlock(&ts->mutex); |
| 443 | |
| 444 | return !!(val & AD7879_GPIO_DATA); |
| 445 | } |
| 446 | |
| 447 | static void ad7879_gpio_set_value(struct gpio_chip *chip, |
| 448 | unsigned gpio, int value) |
| 449 | { |
| 450 | struct ad7879 *ts = gpiochip_get_data(chip); |
| 451 | |
| 452 | mutex_lock(&ts->mutex); |
| 453 | if (value) |
| 454 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; |
| 455 | else |
| 456 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; |
| 457 | |
| 458 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
| 459 | mutex_unlock(&ts->mutex); |
| 460 | } |
| 461 | |
| 462 | static int ad7879_gpio_add(struct ad7879 *ts) |
| 463 | { |
| 464 | int ret = 0; |
| 465 | |
| 466 | mutex_init(&ts->mutex); |
| 467 | |
| 468 | /* Do not create a chip unless flagged for it */ |
| 469 | if (!device_property_read_bool(ts->dev, "gpio-controller")) |
| 470 | return 0; |
| 471 | |
| 472 | ts->gc.direction_input = ad7879_gpio_direction_input; |
| 473 | ts->gc.direction_output = ad7879_gpio_direction_output; |
| 474 | ts->gc.get = ad7879_gpio_get_value; |
| 475 | ts->gc.set = ad7879_gpio_set_value; |
| 476 | ts->gc.can_sleep = 1; |
| 477 | ts->gc.base = -1; |
| 478 | ts->gc.ngpio = 1; |
| 479 | ts->gc.label = "AD7879-GPIO"; |
| 480 | ts->gc.owner = THIS_MODULE; |
| 481 | ts->gc.parent = ts->dev; |
| 482 | |
| 483 | ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts); |
| 484 | if (ret) |
| 485 | dev_err(ts->dev, "failed to register gpio %d\n", |
| 486 | ts->gc.base); |
| 487 | |
| 488 | return ret; |
| 489 | } |
| 490 | #else |
| 491 | static int ad7879_gpio_add(struct ad7879 *ts) |
| 492 | { |
| 493 | return 0; |
| 494 | } |
| 495 | #endif |
| 496 | |
| 497 | static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts) |
| 498 | { |
| 499 | int err; |
| 500 | u32 tmp; |
| 501 | |
| 502 | err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp); |
| 503 | if (err) { |
| 504 | dev_err(dev, "failed to get resistance-plate-x property\n"); |
| 505 | return err; |
| 506 | } |
| 507 | ts->x_plate_ohms = (u16)tmp; |
| 508 | |
| 509 | device_property_read_u8(dev, "adi,first-conversion-delay", |
| 510 | &ts->first_conversion_delay); |
| 511 | device_property_read_u8(dev, "adi,acquisition-time", |
| 512 | &ts->acquisition_time); |
| 513 | device_property_read_u8(dev, "adi,median-filter-size", &ts->median); |
| 514 | device_property_read_u8(dev, "adi,averaging", &ts->averaging); |
| 515 | device_property_read_u8(dev, "adi,conversion-interval", |
| 516 | &ts->pen_down_acc_interval); |
| 517 | |
| 518 | ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y"); |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | int ad7879_probe(struct device *dev, struct regmap *regmap, |
| 524 | int irq, u16 bustype, u8 devid) |
| 525 | { |
| 526 | struct ad7879 *ts; |
| 527 | struct input_dev *input_dev; |
| 528 | int err; |
| 529 | u16 revid; |
| 530 | |
| 531 | if (irq <= 0) { |
| 532 | dev_err(dev, "No IRQ specified\n"); |
| 533 | return -EINVAL; |
| 534 | } |
| 535 | |
| 536 | ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); |
| 537 | if (!ts) |
| 538 | return -ENOMEM; |
| 539 | |
| 540 | err = ad7879_parse_dt(dev, ts); |
| 541 | if (err) |
| 542 | return err; |
| 543 | |
| 544 | input_dev = devm_input_allocate_device(dev); |
| 545 | if (!input_dev) { |
| 546 | dev_err(dev, "Failed to allocate input device\n"); |
| 547 | return -ENOMEM; |
| 548 | } |
| 549 | |
| 550 | ts->dev = dev; |
| 551 | ts->input = input_dev; |
| 552 | ts->irq = irq; |
| 553 | ts->regmap = regmap; |
| 554 | |
| 555 | timer_setup(&ts->timer, ad7879_timer, 0); |
| 556 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev)); |
| 557 | |
| 558 | input_dev->name = "AD7879 Touchscreen"; |
| 559 | input_dev->phys = ts->phys; |
| 560 | input_dev->dev.parent = dev; |
| 561 | input_dev->id.bustype = bustype; |
| 562 | |
| 563 | input_dev->open = ad7879_open; |
| 564 | input_dev->close = ad7879_close; |
| 565 | |
| 566 | input_set_drvdata(input_dev, ts); |
| 567 | |
| 568 | input_set_capability(input_dev, EV_KEY, BTN_TOUCH); |
| 569 | |
| 570 | input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); |
| 571 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); |
| 572 | input_set_capability(input_dev, EV_ABS, ABS_PRESSURE); |
| 573 | touchscreen_parse_properties(input_dev, false, NULL); |
| 574 | if (!input_abs_get_max(input_dev, ABS_PRESSURE)) { |
| 575 | dev_err(dev, "Touchscreen pressure is not specified\n"); |
| 576 | return -EINVAL; |
| 577 | } |
| 578 | |
| 579 | err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET); |
| 580 | if (err < 0) { |
| 581 | dev_err(dev, "Failed to write %s\n", input_dev->name); |
| 582 | return err; |
| 583 | } |
| 584 | |
| 585 | revid = ad7879_read(ts, AD7879_REG_REVID); |
| 586 | input_dev->id.product = (revid & 0xff); |
| 587 | input_dev->id.version = revid >> 8; |
| 588 | if (input_dev->id.product != devid) { |
| 589 | dev_err(dev, "Failed to probe %s (%x vs %x)\n", |
| 590 | input_dev->name, devid, revid); |
| 591 | return -ENODEV; |
| 592 | } |
| 593 | |
| 594 | ts->cmd_crtl3 = AD7879_YPLUS_BIT | |
| 595 | AD7879_XPLUS_BIT | |
| 596 | AD7879_Z2_BIT | |
| 597 | AD7879_Z1_BIT | |
| 598 | AD7879_TEMPMASK_BIT | |
| 599 | AD7879_AUXVBATMASK_BIT | |
| 600 | AD7879_GPIOALERTMASK_BIT; |
| 601 | |
| 602 | ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR | |
| 603 | AD7879_AVG(ts->averaging) | |
| 604 | AD7879_MFS(ts->median) | |
| 605 | AD7879_FCD(ts->first_conversion_delay); |
| 606 | |
| 607 | ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 | |
| 608 | AD7879_ACQ(ts->acquisition_time) | |
| 609 | AD7879_TMR(ts->pen_down_acc_interval); |
| 610 | |
| 611 | err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq, |
| 612 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 613 | dev_name(dev), ts); |
| 614 | if (err) { |
| 615 | dev_err(dev, "Failed to request IRQ: %d\n", err); |
| 616 | return err; |
| 617 | } |
| 618 | |
| 619 | __ad7879_disable(ts); |
| 620 | |
| 621 | err = ad7879_gpio_add(ts); |
| 622 | if (err) |
| 623 | return err; |
| 624 | |
| 625 | err = input_register_device(input_dev); |
| 626 | if (err) |
| 627 | return err; |
| 628 | |
| 629 | dev_set_drvdata(dev, ts); |
| 630 | |
| 631 | return 0; |
| 632 | } |
| 633 | EXPORT_SYMBOL(ad7879_probe); |
| 634 | |
| 635 | MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); |
| 636 | MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver"); |
| 637 | MODULE_LICENSE("GPL"); |