1 /* 2 * TSC2005 touchscreen driver 3 * 4 * Copyright (C) 2006-2010 Nokia Corporation 5 * 6 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> 7 * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 * 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/input.h> 28 #include <linux/interrupt.h> 29 #include <linux/delay.h> 30 #include <linux/pm.h> 31 #include <linux/spi/spi.h> 32 #include <linux/spi/tsc2005.h> 33 34 /* 35 * The touchscreen interface operates as follows: 36 * 37 * 1) Pen is pressed against the touchscreen. 38 * 2) TSC2005 performs AD conversion. 39 * 3) After the conversion is done TSC2005 drives DAV line down. 40 * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. 41 * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 42 * values. 43 * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up 44 * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). 45 * 7) When the penup timer expires, there have not been touch or DAV interrupts 46 * during the last 40ms which means the pen has been lifted. 47 * 48 * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond 49 * after a configurable period (in ms) of activity. If esd_timeout is 0, the 50 * watchdog is disabled. 51 */ 52 53 /* control byte 1 */ 54 #define TSC2005_CMD 0x80 55 #define TSC2005_CMD_NORMAL 0x00 56 #define TSC2005_CMD_STOP 0x01 57 #define TSC2005_CMD_12BIT 0x04 58 59 /* control byte 0 */ 60 #define TSC2005_REG_READ 0x0001 61 #define TSC2005_REG_PND0 0x0002 62 #define TSC2005_REG_X 0x0000 63 #define TSC2005_REG_Y 0x0008 64 #define TSC2005_REG_Z1 0x0010 65 #define TSC2005_REG_Z2 0x0018 66 #define TSC2005_REG_TEMP_HIGH 0x0050 67 #define TSC2005_REG_CFR0 0x0060 68 #define TSC2005_REG_CFR1 0x0068 69 #define TSC2005_REG_CFR2 0x0070 70 71 /* configuration register 0 */ 72 #define TSC2005_CFR0_PRECHARGE_276US 0x0040 73 #define TSC2005_CFR0_STABTIME_1MS 0x0300 74 #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 75 #define TSC2005_CFR0_RESOLUTION12 0x2000 76 #define TSC2005_CFR0_PENMODE 0x8000 77 #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ 78 TSC2005_CFR0_CLOCK_1MHZ | \ 79 TSC2005_CFR0_RESOLUTION12 | \ 80 TSC2005_CFR0_PRECHARGE_276US | \ 81 TSC2005_CFR0_PENMODE) 82 83 /* bits common to both read and write of configuration register 0 */ 84 #define TSC2005_CFR0_RW_MASK 0x3fff 85 86 /* configuration register 1 */ 87 #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 88 #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS 89 90 /* configuration register 2 */ 91 #define TSC2005_CFR2_MAVE_Z 0x0004 92 #define TSC2005_CFR2_MAVE_Y 0x0008 93 #define TSC2005_CFR2_MAVE_X 0x0010 94 #define TSC2005_CFR2_AVG_7 0x0800 95 #define TSC2005_CFR2_MEDIUM_15 0x3000 96 #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ 97 TSC2005_CFR2_MAVE_Y | \ 98 TSC2005_CFR2_MAVE_Z | \ 99 TSC2005_CFR2_MEDIUM_15 | \ 100 TSC2005_CFR2_AVG_7) 101 102 #define MAX_12BIT 0xfff 103 #define TSC2005_SPI_MAX_SPEED_HZ 10000000 104 #define TSC2005_PENUP_TIME_MS 40 105 106 struct tsc2005_spi_rd { 107 struct spi_transfer spi_xfer; 108 u32 spi_tx; 109 u32 spi_rx; 110 }; 111 112 struct tsc2005 { 113 struct spi_device *spi; 114 115 struct spi_message spi_read_msg; 116 struct tsc2005_spi_rd spi_x; 117 struct tsc2005_spi_rd spi_y; 118 struct tsc2005_spi_rd spi_z1; 119 struct tsc2005_spi_rd spi_z2; 120 121 struct input_dev *idev; 122 char phys[32]; 123 124 struct mutex mutex; 125 126 /* raw copy of previous x,y,z */ 127 int in_x; 128 int in_y; 129 int in_z1; 130 int in_z2; 131 132 spinlock_t lock; 133 struct timer_list penup_timer; 134 135 unsigned int esd_timeout; 136 struct delayed_work esd_work; 137 unsigned long last_valid_interrupt; 138 139 unsigned int x_plate_ohm; 140 141 bool opened; 142 bool suspended; 143 144 bool pen_down; 145 146 void (*set_reset)(bool enable); 147 }; 148 149 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) 150 { 151 u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; 152 struct spi_transfer xfer = { 153 .tx_buf = &tx, 154 .len = 1, 155 .bits_per_word = 8, 156 }; 157 struct spi_message msg; 158 int error; 159 160 spi_message_init(&msg); 161 spi_message_add_tail(&xfer, &msg); 162 163 error = spi_sync(ts->spi, &msg); 164 if (error) { 165 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", 166 __func__, cmd, error); 167 return error; 168 } 169 170 return 0; 171 } 172 173 static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) 174 { 175 u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value; 176 struct spi_transfer xfer = { 177 .tx_buf = &tx, 178 .len = 4, 179 .bits_per_word = 24, 180 }; 181 struct spi_message msg; 182 int error; 183 184 spi_message_init(&msg); 185 spi_message_add_tail(&xfer, &msg); 186 187 error = spi_sync(ts->spi, &msg); 188 if (error) { 189 dev_err(&ts->spi->dev, 190 "%s: failed, register: %x, value: %x, error: %d\n", 191 __func__, reg, value, error); 192 return error; 193 } 194 195 return 0; 196 } 197 198 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) 199 { 200 memset(rd, 0, sizeof(*rd)); 201 202 rd->spi_tx = (reg | TSC2005_REG_READ) << 16; 203 rd->spi_xfer.tx_buf = &rd->spi_tx; 204 rd->spi_xfer.rx_buf = &rd->spi_rx; 205 rd->spi_xfer.len = 4; 206 rd->spi_xfer.bits_per_word = 24; 207 rd->spi_xfer.cs_change = !last; 208 } 209 210 static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) 211 { 212 struct tsc2005_spi_rd spi_rd; 213 struct spi_message msg; 214 int error; 215 216 tsc2005_setup_read(&spi_rd, reg, true); 217 218 spi_message_init(&msg); 219 spi_message_add_tail(&spi_rd.spi_xfer, &msg); 220 221 error = spi_sync(ts->spi, &msg); 222 if (error) 223 return error; 224 225 *value = spi_rd.spi_rx; 226 return 0; 227 } 228 229 static void tsc2005_update_pen_state(struct tsc2005 *ts, 230 int x, int y, int pressure) 231 { 232 if (pressure) { 233 input_report_abs(ts->idev, ABS_X, x); 234 input_report_abs(ts->idev, ABS_Y, y); 235 input_report_abs(ts->idev, ABS_PRESSURE, pressure); 236 if (!ts->pen_down) { 237 input_report_key(ts->idev, BTN_TOUCH, !!pressure); 238 ts->pen_down = true; 239 } 240 } else { 241 input_report_abs(ts->idev, ABS_PRESSURE, 0); 242 if (ts->pen_down) { 243 input_report_key(ts->idev, BTN_TOUCH, 0); 244 ts->pen_down = false; 245 } 246 } 247 input_sync(ts->idev); 248 dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, 249 pressure); 250 } 251 252 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) 253 { 254 struct tsc2005 *ts = _ts; 255 unsigned long flags; 256 unsigned int pressure; 257 u32 x, y; 258 u32 z1, z2; 259 int error; 260 261 /* read the coordinates */ 262 error = spi_sync(ts->spi, &ts->spi_read_msg); 263 if (unlikely(error)) 264 goto out; 265 266 x = ts->spi_x.spi_rx; 267 y = ts->spi_y.spi_rx; 268 z1 = ts->spi_z1.spi_rx; 269 z2 = ts->spi_z2.spi_rx; 270 271 /* validate position */ 272 if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) 273 goto out; 274 275 /* Skip reading if the pressure components are out of range */ 276 if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) 277 goto out; 278 279 /* 280 * Skip point if this is a pen down with the exact same values as 281 * the value before pen-up - that implies SPI fed us stale data 282 */ 283 if (!ts->pen_down && 284 ts->in_x == x && ts->in_y == y && 285 ts->in_z1 == z1 && ts->in_z2 == z2) { 286 goto out; 287 } 288 289 /* 290 * At this point we are happy we have a valid and useful reading. 291 * Remember it for later comparisons. We may now begin downsampling. 292 */ 293 ts->in_x = x; 294 ts->in_y = y; 295 ts->in_z1 = z1; 296 ts->in_z2 = z2; 297 298 /* Compute touch pressure resistance using equation #1 */ 299 pressure = x * (z2 - z1) / z1; 300 pressure = pressure * ts->x_plate_ohm / 4096; 301 if (unlikely(pressure > MAX_12BIT)) 302 goto out; 303 304 spin_lock_irqsave(&ts->lock, flags); 305 306 tsc2005_update_pen_state(ts, x, y, pressure); 307 mod_timer(&ts->penup_timer, 308 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); 309 310 spin_unlock_irqrestore(&ts->lock, flags); 311 312 ts->last_valid_interrupt = jiffies; 313 out: 314 return IRQ_HANDLED; 315 } 316 317 static void tsc2005_penup_timer(unsigned long data) 318 { 319 struct tsc2005 *ts = (struct tsc2005 *)data; 320 unsigned long flags; 321 322 spin_lock_irqsave(&ts->lock, flags); 323 tsc2005_update_pen_state(ts, 0, 0, 0); 324 spin_unlock_irqrestore(&ts->lock, flags); 325 } 326 327 static void tsc2005_start_scan(struct tsc2005 *ts) 328 { 329 tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); 330 tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); 331 tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); 332 tsc2005_cmd(ts, TSC2005_CMD_NORMAL); 333 } 334 335 static void tsc2005_stop_scan(struct tsc2005 *ts) 336 { 337 tsc2005_cmd(ts, TSC2005_CMD_STOP); 338 } 339 340 /* must be called with ts->mutex held */ 341 static void __tsc2005_disable(struct tsc2005 *ts) 342 { 343 tsc2005_stop_scan(ts); 344 345 disable_irq(ts->spi->irq); 346 del_timer_sync(&ts->penup_timer); 347 348 cancel_delayed_work_sync(&ts->esd_work); 349 350 enable_irq(ts->spi->irq); 351 } 352 353 /* must be called with ts->mutex held */ 354 static void __tsc2005_enable(struct tsc2005 *ts) 355 { 356 tsc2005_start_scan(ts); 357 358 if (ts->esd_timeout && ts->set_reset) { 359 ts->last_valid_interrupt = jiffies; 360 schedule_delayed_work(&ts->esd_work, 361 round_jiffies(jiffies + 362 msecs_to_jiffies(ts->esd_timeout))); 363 } 364 365 } 366 367 static ssize_t tsc2005_selftest_show(struct device *dev, 368 struct device_attribute *attr, 369 char *buf) 370 { 371 struct spi_device *spi = to_spi_device(dev); 372 struct tsc2005 *ts = spi_get_drvdata(spi); 373 u16 temp_high; 374 u16 temp_high_orig; 375 u16 temp_high_test; 376 bool success = true; 377 int error; 378 379 mutex_lock(&ts->mutex); 380 381 /* 382 * Test TSC2005 communications via temp high register. 383 */ 384 __tsc2005_disable(ts); 385 386 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); 387 if (error) { 388 dev_warn(dev, "selftest failed: read error %d\n", error); 389 success = false; 390 goto out; 391 } 392 393 temp_high_test = (temp_high_orig - 1) & MAX_12BIT; 394 395 error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); 396 if (error) { 397 dev_warn(dev, "selftest failed: write error %d\n", error); 398 success = false; 399 goto out; 400 } 401 402 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 403 if (error) { 404 dev_warn(dev, "selftest failed: read error %d after write\n", 405 error); 406 success = false; 407 goto out; 408 } 409 410 if (temp_high != temp_high_test) { 411 dev_warn(dev, "selftest failed: %d != %d\n", 412 temp_high, temp_high_test); 413 success = false; 414 } 415 416 /* hardware reset */ 417 ts->set_reset(false); 418 usleep_range(100, 500); /* only 10us required */ 419 ts->set_reset(true); 420 421 if (!success) 422 goto out; 423 424 /* test that the reset really happened */ 425 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 426 if (error) { 427 dev_warn(dev, "selftest failed: read error %d after reset\n", 428 error); 429 success = false; 430 goto out; 431 } 432 433 if (temp_high != temp_high_orig) { 434 dev_warn(dev, "selftest failed after reset: %d != %d\n", 435 temp_high, temp_high_orig); 436 success = false; 437 } 438 439 out: 440 __tsc2005_enable(ts); 441 mutex_unlock(&ts->mutex); 442 443 return sprintf(buf, "%d\n", success); 444 } 445 446 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); 447 448 static struct attribute *tsc2005_attrs[] = { 449 &dev_attr_selftest.attr, 450 NULL 451 }; 452 453 static mode_t tsc2005_attr_is_visible(struct kobject *kobj, 454 struct attribute *attr, int n) 455 { 456 struct device *dev = container_of(kobj, struct device, kobj); 457 struct spi_device *spi = to_spi_device(dev); 458 struct tsc2005 *ts = spi_get_drvdata(spi); 459 mode_t mode = attr->mode; 460 461 if (attr == &dev_attr_selftest.attr) { 462 if (!ts->set_reset) 463 mode = 0; 464 } 465 466 return mode; 467 } 468 469 static const struct attribute_group tsc2005_attr_group = { 470 .is_visible = tsc2005_attr_is_visible, 471 .attrs = tsc2005_attrs, 472 }; 473 474 static void tsc2005_esd_work(struct work_struct *work) 475 { 476 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); 477 int error; 478 u16 r; 479 480 mutex_lock(&ts->mutex); 481 482 if (time_is_after_jiffies(ts->last_valid_interrupt + 483 msecs_to_jiffies(ts->esd_timeout))) 484 goto out; 485 486 /* We should be able to read register without disabling interrupts. */ 487 error = tsc2005_read(ts, TSC2005_REG_CFR0, &r); 488 if (!error && 489 !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { 490 goto out; 491 } 492 493 /* 494 * If we could not read our known value from configuration register 0 495 * then we should reset the controller as if from power-up and start 496 * scanning again. 497 */ 498 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); 499 500 disable_irq(ts->spi->irq); 501 del_timer_sync(&ts->penup_timer); 502 503 tsc2005_update_pen_state(ts, 0, 0, 0); 504 505 ts->set_reset(false); 506 usleep_range(100, 500); /* only 10us required */ 507 ts->set_reset(true); 508 509 enable_irq(ts->spi->irq); 510 tsc2005_start_scan(ts); 511 512 out: 513 /* re-arm the watchdog */ 514 schedule_delayed_work(&ts->esd_work, 515 round_jiffies(jiffies + 516 msecs_to_jiffies(ts->esd_timeout))); 517 mutex_unlock(&ts->mutex); 518 } 519 520 static int tsc2005_open(struct input_dev *input) 521 { 522 struct tsc2005 *ts = input_get_drvdata(input); 523 524 mutex_lock(&ts->mutex); 525 526 if (!ts->suspended) 527 __tsc2005_enable(ts); 528 529 ts->opened = true; 530 531 mutex_unlock(&ts->mutex); 532 533 return 0; 534 } 535 536 static void tsc2005_close(struct input_dev *input) 537 { 538 struct tsc2005 *ts = input_get_drvdata(input); 539 540 mutex_lock(&ts->mutex); 541 542 if (!ts->suspended) 543 __tsc2005_disable(ts); 544 545 ts->opened = false; 546 547 mutex_unlock(&ts->mutex); 548 } 549 550 static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts) 551 { 552 tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false); 553 tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false); 554 tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false); 555 tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true); 556 557 spi_message_init(&ts->spi_read_msg); 558 spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); 559 spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); 560 spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); 561 spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); 562 } 563 564 static int __devinit tsc2005_probe(struct spi_device *spi) 565 { 566 const struct tsc2005_platform_data *pdata = spi->dev.platform_data; 567 struct tsc2005 *ts; 568 struct input_dev *input_dev; 569 unsigned int max_x, max_y, max_p; 570 unsigned int fudge_x, fudge_y, fudge_p; 571 int error; 572 573 if (!pdata) { 574 dev_dbg(&spi->dev, "no platform data\n"); 575 return -ENODEV; 576 } 577 578 fudge_x = pdata->ts_x_fudge ? : 4; 579 fudge_y = pdata->ts_y_fudge ? : 8; 580 fudge_p = pdata->ts_pressure_fudge ? : 2; 581 max_x = pdata->ts_x_max ? : MAX_12BIT; 582 max_y = pdata->ts_y_max ? : MAX_12BIT; 583 max_p = pdata->ts_pressure_max ? : MAX_12BIT; 584 585 if (spi->irq <= 0) { 586 dev_dbg(&spi->dev, "no irq\n"); 587 return -ENODEV; 588 } 589 590 spi->mode = SPI_MODE_0; 591 spi->bits_per_word = 8; 592 if (!spi->max_speed_hz) 593 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; 594 595 error = spi_setup(spi); 596 if (error) 597 return error; 598 599 ts = kzalloc(sizeof(*ts), GFP_KERNEL); 600 input_dev = input_allocate_device(); 601 if (!ts || !input_dev) { 602 error = -ENOMEM; 603 goto err_free_mem; 604 } 605 606 ts->spi = spi; 607 ts->idev = input_dev; 608 609 ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280; 610 ts->esd_timeout = pdata->esd_timeout_ms; 611 ts->set_reset = pdata->set_reset; 612 613 mutex_init(&ts->mutex); 614 615 spin_lock_init(&ts->lock); 616 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); 617 618 INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); 619 620 tsc2005_setup_spi_xfer(ts); 621 622 snprintf(ts->phys, sizeof(ts->phys), 623 "%s/input-ts", dev_name(&spi->dev)); 624 625 input_dev->name = "TSC2005 touchscreen"; 626 input_dev->phys = ts->phys; 627 input_dev->id.bustype = BUS_SPI; 628 input_dev->dev.parent = &spi->dev; 629 input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); 630 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 631 632 input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); 633 input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); 634 input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); 635 636 input_dev->open = tsc2005_open; 637 input_dev->close = tsc2005_close; 638 639 input_set_drvdata(input_dev, ts); 640 641 /* Ensure the touchscreen is off */ 642 tsc2005_stop_scan(ts); 643 644 error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread, 645 IRQF_TRIGGER_RISING, "tsc2005", ts); 646 if (error) { 647 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); 648 goto err_free_mem; 649 } 650 651 spi_set_drvdata(spi, ts); 652 error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); 653 if (error) { 654 dev_err(&spi->dev, 655 "Failed to create sysfs attributes, err: %d\n", error); 656 goto err_clear_drvdata; 657 } 658 659 error = input_register_device(ts->idev); 660 if (error) { 661 dev_err(&spi->dev, 662 "Failed to register input device, err: %d\n", error); 663 goto err_remove_sysfs; 664 } 665 666 set_irq_wake(spi->irq, 1); 667 return 0; 668 669 err_remove_sysfs: 670 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); 671 err_clear_drvdata: 672 spi_set_drvdata(spi, NULL); 673 free_irq(spi->irq, ts); 674 err_free_mem: 675 input_free_device(input_dev); 676 kfree(ts); 677 return error; 678 } 679 680 static int __devexit tsc2005_remove(struct spi_device *spi) 681 { 682 struct tsc2005 *ts = spi_get_drvdata(spi); 683 684 sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group); 685 686 free_irq(ts->spi->irq, ts); 687 input_unregister_device(ts->idev); 688 kfree(ts); 689 690 spi_set_drvdata(spi, NULL); 691 return 0; 692 } 693 694 #ifdef CONFIG_PM_SLEEP 695 static int tsc2005_suspend(struct device *dev) 696 { 697 struct spi_device *spi = to_spi_device(dev); 698 struct tsc2005 *ts = spi_get_drvdata(spi); 699 700 mutex_lock(&ts->mutex); 701 702 if (!ts->suspended && ts->opened) 703 __tsc2005_disable(ts); 704 705 ts->suspended = true; 706 707 mutex_unlock(&ts->mutex); 708 709 return 0; 710 } 711 712 static int tsc2005_resume(struct device *dev) 713 { 714 struct spi_device *spi = to_spi_device(dev); 715 struct tsc2005 *ts = spi_get_drvdata(spi); 716 717 mutex_lock(&ts->mutex); 718 719 if (ts->suspended && ts->opened) 720 __tsc2005_enable(ts); 721 722 ts->suspended = false; 723 724 mutex_unlock(&ts->mutex); 725 726 return 0; 727 } 728 #endif 729 730 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); 731 732 static struct spi_driver tsc2005_driver = { 733 .driver = { 734 .name = "tsc2005", 735 .owner = THIS_MODULE, 736 .pm = &tsc2005_pm_ops, 737 }, 738 .probe = tsc2005_probe, 739 .remove = __devexit_p(tsc2005_remove), 740 }; 741 742 static int __init tsc2005_init(void) 743 { 744 return spi_register_driver(&tsc2005_driver); 745 } 746 module_init(tsc2005_init); 747 748 static void __exit tsc2005_exit(void) 749 { 750 spi_unregister_driver(&tsc2005_driver); 751 } 752 module_exit(tsc2005_exit); 753 754 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); 755 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); 756 MODULE_LICENSE("GPL"); 757