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 struct timer_list penup_timer; 133 struct work_struct penup_work; 134 135 unsigned int esd_timeout; 136 struct timer_list esd_timer; 137 struct work_struct esd_work; 138 139 unsigned int x_plate_ohm; 140 141 bool disabled; 142 unsigned int disable_depth; 143 unsigned int pen_down; 144 145 void (*set_reset)(bool enable); 146 }; 147 148 static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd) 149 { 150 u8 tx; 151 struct spi_message msg; 152 struct spi_transfer xfer = { 0 }; 153 154 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; 155 156 xfer.tx_buf = &tx; 157 xfer.rx_buf = NULL; 158 xfer.len = 1; 159 xfer.bits_per_word = 8; 160 161 spi_message_init(&msg); 162 spi_message_add_tail(&xfer, &msg); 163 spi_sync(ts->spi, &msg); 164 } 165 166 static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) 167 { 168 u32 tx; 169 struct spi_message msg; 170 struct spi_transfer xfer = { 0 }; 171 172 tx = (reg | TSC2005_REG_PND0) << 16; 173 tx |= value; 174 175 xfer.tx_buf = &tx; 176 xfer.rx_buf = NULL; 177 xfer.len = 4; 178 xfer.bits_per_word = 24; 179 180 spi_message_init(&msg); 181 spi_message_add_tail(&xfer, &msg); 182 spi_sync(ts->spi, &msg); 183 } 184 185 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) 186 { 187 rd->spi_tx = (reg | TSC2005_REG_READ) << 16; 188 rd->spi_xfer.tx_buf = &rd->spi_tx; 189 rd->spi_xfer.rx_buf = &rd->spi_rx; 190 rd->spi_xfer.len = 4; 191 rd->spi_xfer.bits_per_word = 24; 192 rd->spi_xfer.cs_change = !last; 193 } 194 195 static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) 196 { 197 struct spi_message msg; 198 struct tsc2005_spi_rd spi_rd = { { 0 }, 0, 0 }; 199 200 tsc2005_setup_read(&spi_rd, reg, 1); 201 202 spi_message_init(&msg); 203 spi_message_add_tail(&spi_rd.spi_xfer, &msg); 204 spi_sync(ts->spi, &msg); 205 *value = spi_rd.spi_rx; 206 } 207 208 static void tsc2005_update_pen_state(struct tsc2005 *ts, 209 int x, int y, int pressure) 210 { 211 if (pressure) { 212 input_report_abs(ts->idev, ABS_X, x); 213 input_report_abs(ts->idev, ABS_Y, y); 214 input_report_abs(ts->idev, ABS_PRESSURE, pressure); 215 if (!ts->pen_down) { 216 input_report_key(ts->idev, BTN_TOUCH, !!pressure); 217 ts->pen_down = 1; 218 } 219 } else { 220 input_report_abs(ts->idev, ABS_PRESSURE, 0); 221 if (ts->pen_down) { 222 input_report_key(ts->idev, BTN_TOUCH, 0); 223 ts->pen_down = 0; 224 } 225 } 226 input_sync(ts->idev); 227 dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, 228 pressure); 229 } 230 231 static irqreturn_t tsc2005_irq_handler(int irq, void *dev_id) 232 { 233 struct tsc2005 *ts = dev_id; 234 235 /* update the penup timer only if it's pending */ 236 mod_timer_pending(&ts->penup_timer, 237 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); 238 239 return IRQ_WAKE_THREAD; 240 } 241 242 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) 243 { 244 struct tsc2005 *ts = _ts; 245 unsigned int pressure; 246 u32 x; 247 u32 y; 248 u32 z1; 249 u32 z2; 250 251 mutex_lock(&ts->mutex); 252 253 if (unlikely(ts->disable_depth)) 254 goto out; 255 256 /* read the coordinates */ 257 spi_sync(ts->spi, &ts->spi_read_msg); 258 x = ts->spi_x.spi_rx; 259 y = ts->spi_y.spi_rx; 260 z1 = ts->spi_z1.spi_rx; 261 z2 = ts->spi_z2.spi_rx; 262 263 /* validate position */ 264 if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) 265 goto out; 266 267 /* skip coords if the pressure components are out of range */ 268 if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) 269 goto out; 270 271 /* skip point if this is a pen down with the exact same values as 272 * the value before pen-up - that implies SPI fed us stale data 273 */ 274 if (!ts->pen_down && 275 ts->in_x == x && 276 ts->in_y == y && 277 ts->in_z1 == z1 && 278 ts->in_z2 == z2) 279 goto out; 280 281 /* At this point we are happy we have a valid and useful reading. 282 * Remember it for later comparisons. We may now begin downsampling 283 */ 284 ts->in_x = x; 285 ts->in_y = y; 286 ts->in_z1 = z1; 287 ts->in_z2 = z2; 288 289 /* compute touch pressure resistance using equation #1 */ 290 pressure = x * (z2 - z1) / z1; 291 pressure = pressure * ts->x_plate_ohm / 4096; 292 if (unlikely(pressure > MAX_12BIT)) 293 goto out; 294 295 tsc2005_update_pen_state(ts, x, y, pressure); 296 297 /* set the penup timer */ 298 mod_timer(&ts->penup_timer, 299 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); 300 301 if (!ts->esd_timeout) 302 goto out; 303 304 /* update the watchdog timer */ 305 mod_timer(&ts->esd_timer, 306 round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout))); 307 308 out: 309 mutex_unlock(&ts->mutex); 310 return IRQ_HANDLED; 311 } 312 313 static void tsc2005_penup_timer(unsigned long data) 314 { 315 struct tsc2005 *ts = (struct tsc2005 *)data; 316 317 schedule_work(&ts->penup_work); 318 } 319 320 static void tsc2005_penup_work(struct work_struct *work) 321 { 322 struct tsc2005 *ts = container_of(work, struct tsc2005, penup_work); 323 324 mutex_lock(&ts->mutex); 325 tsc2005_update_pen_state(ts, 0, 0, 0); 326 mutex_unlock(&ts->mutex); 327 } 328 329 static void tsc2005_start_scan(struct tsc2005 *ts) 330 { 331 tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); 332 tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); 333 tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); 334 tsc2005_cmd(ts, TSC2005_CMD_NORMAL); 335 } 336 337 static void tsc2005_stop_scan(struct tsc2005 *ts) 338 { 339 tsc2005_cmd(ts, TSC2005_CMD_STOP); 340 } 341 342 /* must be called with mutex held */ 343 static void tsc2005_disable(struct tsc2005 *ts) 344 { 345 if (ts->disable_depth++ != 0) 346 return; 347 disable_irq(ts->spi->irq); 348 if (ts->esd_timeout) 349 del_timer_sync(&ts->esd_timer); 350 del_timer_sync(&ts->penup_timer); 351 tsc2005_stop_scan(ts); 352 } 353 354 /* must be called with mutex held */ 355 static void tsc2005_enable(struct tsc2005 *ts) 356 { 357 if (--ts->disable_depth != 0) 358 return; 359 tsc2005_start_scan(ts); 360 enable_irq(ts->spi->irq); 361 if (!ts->esd_timeout) 362 return; 363 mod_timer(&ts->esd_timer, 364 round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout))); 365 } 366 367 static ssize_t tsc2005_disable_show(struct device *dev, 368 struct device_attribute *attr, char *buf) 369 { 370 struct spi_device *spi = to_spi_device(dev); 371 struct tsc2005 *ts = spi_get_drvdata(spi); 372 373 return sprintf(buf, "%u\n", ts->disabled); 374 } 375 376 static ssize_t tsc2005_disable_store(struct device *dev, 377 struct device_attribute *attr, 378 const char *buf, size_t count) 379 { 380 struct spi_device *spi = to_spi_device(dev); 381 struct tsc2005 *ts = spi_get_drvdata(spi); 382 unsigned long res; 383 int i; 384 385 if (strict_strtoul(buf, 10, &res) < 0) 386 return -EINVAL; 387 i = res ? 1 : 0; 388 389 mutex_lock(&ts->mutex); 390 if (i == ts->disabled) 391 goto out; 392 ts->disabled = i; 393 if (i) 394 tsc2005_disable(ts); 395 else 396 tsc2005_enable(ts); 397 out: 398 mutex_unlock(&ts->mutex); 399 return count; 400 } 401 static DEVICE_ATTR(disable, 0664, tsc2005_disable_show, tsc2005_disable_store); 402 403 static ssize_t tsc2005_selftest_show(struct device *dev, 404 struct device_attribute *attr, 405 char *buf) 406 { 407 struct spi_device *spi = to_spi_device(dev); 408 struct tsc2005 *ts = spi_get_drvdata(spi); 409 u16 temp_high; 410 u16 temp_high_orig; 411 u16 temp_high_test; 412 unsigned int result; 413 414 if (!ts->set_reset) { 415 dev_warn(&ts->spi->dev, 416 "unable to selftest: no reset function\n"); 417 result = 0; 418 goto out; 419 } 420 421 mutex_lock(&ts->mutex); 422 423 /* 424 * Test TSC2005 communications via temp high register. 425 */ 426 tsc2005_disable(ts); 427 result = 1; 428 tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); 429 temp_high_test = (temp_high_orig - 1) & MAX_12BIT; 430 tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); 431 tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 432 if (temp_high != temp_high_test) { 433 dev_warn(dev, "selftest failed: %d != %d\n", 434 temp_high, temp_high_test); 435 result = 0; 436 } 437 438 /* hardware reset */ 439 ts->set_reset(0); 440 usleep_range(100, 500); /* only 10us required */ 441 ts->set_reset(1); 442 tsc2005_enable(ts); 443 444 /* test that the reset really happened */ 445 tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); 446 if (temp_high != temp_high_orig) { 447 dev_warn(dev, "selftest failed after reset: %d != %d\n", 448 temp_high, temp_high_orig); 449 result = 0; 450 } 451 452 mutex_unlock(&ts->mutex); 453 454 out: 455 return sprintf(buf, "%u\n", result); 456 } 457 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); 458 459 static void tsc2005_esd_timer(unsigned long data) 460 { 461 struct tsc2005 *ts = (struct tsc2005 *)data; 462 463 schedule_work(&ts->esd_work); 464 } 465 466 static void tsc2005_esd_work(struct work_struct *work) 467 { 468 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work); 469 u16 r; 470 471 mutex_lock(&ts->mutex); 472 473 if (ts->disable_depth) 474 goto out; 475 476 /* 477 * If we cannot read our known value from configuration register 0 then 478 * reset the controller as if from power-up and start scanning again. 479 */ 480 tsc2005_read(ts, TSC2005_REG_CFR0, &r); 481 if ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) { 482 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); 483 ts->set_reset(0); 484 tsc2005_update_pen_state(ts, 0, 0, 0); 485 usleep_range(100, 500); /* only 10us required */ 486 ts->set_reset(1); 487 tsc2005_start_scan(ts); 488 } 489 490 /* re-arm the watchdog */ 491 mod_timer(&ts->esd_timer, 492 round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout))); 493 494 out: 495 mutex_unlock(&ts->mutex); 496 } 497 498 static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts) 499 { 500 tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, 0); 501 tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, 0); 502 tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, 0); 503 tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, 1); 504 505 spi_message_init(&ts->spi_read_msg); 506 spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); 507 spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); 508 spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); 509 spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); 510 } 511 512 static struct attribute *tsc2005_attrs[] = { 513 &dev_attr_disable.attr, 514 &dev_attr_selftest.attr, 515 NULL 516 }; 517 518 static struct attribute_group tsc2005_attr_group = { 519 .attrs = tsc2005_attrs, 520 }; 521 522 static int __devinit tsc2005_setup(struct tsc2005 *ts, 523 struct tsc2005_platform_data *pdata) 524 { 525 int r; 526 int fudge_x; 527 int fudge_y; 528 int fudge_p; 529 int p_max; 530 int x_max; 531 int y_max; 532 533 mutex_init(&ts->mutex); 534 535 tsc2005_setup_spi_xfer(ts); 536 537 init_timer(&ts->penup_timer); 538 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); 539 INIT_WORK(&ts->penup_work, tsc2005_penup_work); 540 541 fudge_x = pdata->ts_x_fudge ? : 4; 542 fudge_y = pdata->ts_y_fudge ? : 8; 543 fudge_p = pdata->ts_pressure_fudge ? : 2; 544 x_max = pdata->ts_x_max ? : MAX_12BIT; 545 y_max = pdata->ts_y_max ? : MAX_12BIT; 546 p_max = pdata->ts_pressure_max ? : MAX_12BIT; 547 ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280; 548 ts->esd_timeout = pdata->esd_timeout_ms; 549 ts->set_reset = pdata->set_reset; 550 551 ts->idev = input_allocate_device(); 552 if (ts->idev == NULL) 553 return -ENOMEM; 554 ts->idev->name = "TSC2005 touchscreen"; 555 snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts", 556 dev_name(&ts->spi->dev)); 557 ts->idev->phys = ts->phys; 558 ts->idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); 559 ts->idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE); 560 ts->idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 561 562 input_set_abs_params(ts->idev, ABS_X, 0, x_max, fudge_x, 0); 563 input_set_abs_params(ts->idev, ABS_Y, 0, y_max, fudge_y, 0); 564 input_set_abs_params(ts->idev, ABS_PRESSURE, 0, p_max, fudge_p, 0); 565 566 r = request_threaded_irq(ts->spi->irq, tsc2005_irq_handler, 567 tsc2005_irq_thread, IRQF_TRIGGER_RISING, 568 "tsc2005", ts); 569 if (r) { 570 dev_err(&ts->spi->dev, "request_threaded_irq(): %d\n", r); 571 goto err1; 572 } 573 set_irq_wake(ts->spi->irq, 1); 574 575 r = input_register_device(ts->idev); 576 if (r) { 577 dev_err(&ts->spi->dev, "input_register_device(): %d\n", r); 578 goto err2; 579 } 580 581 r = sysfs_create_group(&ts->spi->dev.kobj, &tsc2005_attr_group); 582 if (r) 583 dev_warn(&ts->spi->dev, "sysfs entry creation failed: %d\n", r); 584 585 tsc2005_start_scan(ts); 586 587 if (!ts->esd_timeout || !ts->set_reset) 588 goto done; 589 590 /* start the optional ESD watchdog */ 591 setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts); 592 INIT_WORK(&ts->esd_work, tsc2005_esd_work); 593 mod_timer(&ts->esd_timer, 594 round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout))); 595 596 done: 597 return 0; 598 599 err2: 600 free_irq(ts->spi->irq, ts); 601 602 err1: 603 input_free_device(ts->idev); 604 return r; 605 } 606 607 static int __devinit tsc2005_probe(struct spi_device *spi) 608 { 609 struct tsc2005_platform_data *pdata = spi->dev.platform_data; 610 struct tsc2005 *ts; 611 int r; 612 613 if (spi->irq < 0) { 614 dev_dbg(&spi->dev, "no irq\n"); 615 return -ENODEV; 616 } 617 618 if (!pdata) { 619 dev_dbg(&spi->dev, "no platform data\n"); 620 return -ENODEV; 621 } 622 623 ts = kzalloc(sizeof(*ts), GFP_KERNEL); 624 if (ts == NULL) 625 return -ENOMEM; 626 627 spi_set_drvdata(spi, ts); 628 ts->spi = spi; 629 spi->dev.power.power_state = PMSG_ON; 630 spi->mode = SPI_MODE_0; 631 spi->bits_per_word = 8; 632 if (!spi->max_speed_hz) 633 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; 634 spi_setup(spi); 635 636 r = tsc2005_setup(ts, pdata); 637 if (r) 638 kfree(ts); 639 return r; 640 } 641 642 static int __devexit tsc2005_remove(struct spi_device *spi) 643 { 644 struct tsc2005 *ts = spi_get_drvdata(spi); 645 646 mutex_lock(&ts->mutex); 647 tsc2005_disable(ts); 648 mutex_unlock(&ts->mutex); 649 650 if (ts->esd_timeout) 651 del_timer_sync(&ts->esd_timer); 652 del_timer_sync(&ts->penup_timer); 653 654 flush_work(&ts->esd_work); 655 flush_work(&ts->penup_work); 656 657 sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group); 658 free_irq(ts->spi->irq, ts); 659 input_unregister_device(ts->idev); 660 kfree(ts); 661 662 return 0; 663 } 664 665 #ifdef CONFIG_PM_SLEEP 666 static int tsc2005_suspend(struct device *dev) 667 { 668 struct spi_device *spi = to_spi_device(dev); 669 struct tsc2005 *ts = spi_get_drvdata(spi); 670 671 mutex_lock(&ts->mutex); 672 tsc2005_disable(ts); 673 mutex_unlock(&ts->mutex); 674 675 return 0; 676 } 677 678 static int tsc2005_resume(struct device *dev) 679 { 680 struct spi_device *spi = to_spi_device(dev); 681 struct tsc2005 *ts = spi_get_drvdata(spi); 682 683 mutex_lock(&ts->mutex); 684 tsc2005_enable(ts); 685 mutex_unlock(&ts->mutex); 686 687 return 0; 688 } 689 #endif 690 691 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); 692 693 static struct spi_driver tsc2005_driver = { 694 .driver = { 695 .name = "tsc2005", 696 .owner = THIS_MODULE, 697 .pm = &tsc2005_pm_ops, 698 }, 699 .probe = tsc2005_probe, 700 .remove = __devexit_p(tsc2005_remove), 701 }; 702 703 static int __init tsc2005_init(void) 704 { 705 return spi_register_driver(&tsc2005_driver); 706 } 707 module_init(tsc2005_init); 708 709 static void __exit tsc2005_exit(void) 710 { 711 spi_unregister_driver(&tsc2005_driver); 712 } 713 module_exit(tsc2005_exit); 714 715 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); 716 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); 717 MODULE_LICENSE("GPL"); 718