target/linux/s3c24xx/files-2.6.31/drivers/input/touchscreen/s3c2410_ts.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  15  *
  16  * Copyright (c) 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
  17  * iPAQ H1940 touchscreen support
  18  *
  19  * ChangeLog
  20  *
  21  * 2004-09-05: Herbert Pötzl <herbert@13thfloor.at>
  22  *      - added clock (de-)allocation code
  23  *
  24  * 2005-03-06: Arnaud Patard <arnaud.patard@rtp-net.org>
  25  *      - h1940_ -> s3c2410 (this driver is now also used on the n30
  26  *        machines :P)
  27  *      - Debug messages are now enabled with the config option
  28  *        TOUCHSCREEN_S3C2410_DEBUG
  29  *      - Changed the way the value are read
  30  *      - Input subsystem should now work
  31  *      - Use ioremap and readl/writel
  32  *
  33  * 2005-03-23: Arnaud Patard <arnaud.patard@rtp-net.org>
  34  *      - Make use of some undocumented features of the touchscreen
  35  *        controller
  36  *
  37  * 2007-05-23: Harald Welte <laforge@openmoko.org>
  38  *      - Add proper support for S32440
  39  *
  40  * 2008-06-23: Andy Green <andy@openmoko.com>
  41  *      - removed averaging system
  42  *      - added generic Touchscreen filter stuff
  43  *
  44  * 2008-11-27: Nelson Castillo <arhuaco@freaks-unidos.net>
  45  *      - improve interrupt handling
  46  */
  47
  48 #include <linux/errno.h>
  49 #include <linux/kernel.h>
  50 #include <linux/module.h>
  51 #include <linux/slab.h>
  52 #include <linux/input.h>
  53 #include <linux/init.h>
  54 #include <linux/serio.h>
  55 #include <linux/timer.h>
  56 #include <linux/kfifo.h>
  57 #include <linux/delay.h>
  58 #include <linux/platform_device.h>
  59 #include <linux/clk.h>
  60 #include <asm/io.h>
  61 #include <asm/irq.h>
  62
  63 #include <mach/regs-gpio.h>
  64 #include <mach/ts.h>
  65 #include <mach/gpio-fns.h>
  66 #include <plat/regs-adc.h>
  67
  68 #include <linux/touchscreen/ts_filter_chain.h>
  69
  70 /* For ts.dev.id.version */
  71 #define S3C2410TSVERSION        0x0101
  72
  73 #define TSC_SLEEP  (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
  74
  75 #define WAIT4INT(x)  (((x)<<8) | \
  76                      S3C2410_ADCTSC_YM_SEN | \
  77                      S3C2410_ADCTSC_YP_SEN | \
  78                      S3C2410_ADCTSC_XP_SEN | \
  79                      S3C2410_ADCTSC_XY_PST(3))
  80
  81 #define AUTOPST      (S3C2410_ADCTSC_YM_SEN | \
  82                       S3C2410_ADCTSC_YP_SEN | \
  83                       S3C2410_ADCTSC_XP_SEN | \
  84                       S3C2410_ADCTSC_AUTO_PST | \
  85                       S3C2410_ADCTSC_XY_PST(0))
  86
  87 #define DEBUG_LVL    KERN_DEBUG
  88
  89 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
  90 MODULE_DESCRIPTION("s3c2410 touchscreen driver");
  91 MODULE_LICENSE("GPL");
  92
  93 /*
  94  * Definitions & global arrays.
  95  */
  96
  97 static char *s3c2410ts_name = "s3c2410 TouchScreen";
  98
  99 #define TS_RELEASE_TIMEOUT (HZ >> 7 ? HZ >> 7 : 1) /* 8ms (5ms if HZ is 200) */
 100 #define TS_EVENT_FIFO_SIZE (2 << 6) /* must be a power of 2 */
 101
 102 #define TS_STATE_STANDBY 0 /* initial state */
 103 #define TS_STATE_PRESSED 1
 104 #define TS_STATE_RELEASE_PENDING 2
 105 #define TS_STATE_RELEASE 3
 106
 107 /*
 108  * Per-touchscreen data.
 109  */
 110
 111 struct s3c2410ts {
 112         struct input_dev *dev;
 113         struct ts_filter_chain *chain;
 114         int is_down;
 115         int state;
 116         struct kfifo *event_fifo;
 117 };
 118
 119 static struct s3c2410ts ts;
 120
 121 static void __iomem *base_addr;
 122
 123 /*
 124  * A few low level functions.
 125  */
 126
 127 static inline void s3c2410_ts_connect(void)
 128 {
 129         s3c2410_gpio_cfgpin(S3C2410_GPG(12), S3C2410_GPG12_XMON);
 130         s3c2410_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPG13_nXPON);
 131         s3c2410_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPG14_YMON);
 132         s3c2410_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPG15_nYPON);
 133 }
 134
 135 static void s3c2410_ts_start_adc_conversion(void)
 136 {
 137         writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
 138                base_addr + S3C2410_ADCTSC);
 139         writel(readl(base_addr + S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START,
 140                base_addr + S3C2410_ADCCON);
 141 }
 142
 143 /*
 144  * Just send the input events.
 145  */
 146
 147 enum ts_input_event {IE_DOWN = 0, IE_UP};
 148
 149 static void ts_input_report(int event, int coords[])
 150 {
 151 #ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
 152         static char *s[] = {"down", "up"};
 153         struct timeval tv;
 154
 155         do_gettimeofday(&tv);
 156 #endif
 157
 158         if (event == IE_DOWN) {
 159                 input_report_abs(ts.dev, ABS_X, coords[0]);
 160                 input_report_abs(ts.dev, ABS_Y, coords[1]);
 161                 input_report_key(ts.dev, BTN_TOUCH, 1);
 162                 input_report_abs(ts.dev, ABS_PRESSURE, 1);
 163
 164 #ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
 165                 printk(DEBUG_LVL "T:%06d %6s (X:%03d, Y:%03d)\n",
 166                        (int)tv.tv_usec, s[event], coords[0], coords[1]);
 167 #endif
 168         } else {
 169                 input_report_key(ts.dev, BTN_TOUCH, 0);
 170                 input_report_abs(ts.dev, ABS_PRESSURE, 0);
 171
 172 #ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
 173                 printk(DEBUG_LVL "T:%06d %6s\n",
 174                        (int)tv.tv_usec, s[event]);
 175 #endif
 176         }
 177
 178         input_sync(ts.dev);
 179 }
 180
 181 /*
 182  * Manage the state of the touchscreen.
 183  */
 184
 185 static void event_send_timer_f(unsigned long data);
 186
 187 static struct timer_list event_send_timer =
 188                 TIMER_INITIALIZER(event_send_timer_f, 0, 0);
 189
 190 static void event_send_timer_f(unsigned long data)
 191 {
 192         static int noop_counter;
 193         int event_type;
 194
 195         while (__kfifo_get(ts.event_fifo, (unsigned char *)&event_type,
 196                            sizeof(int))) {
 197                 int buf[2];
 198
 199                 switch (event_type) {
 200                 case 'D':
 201                         if (ts.state == TS_STATE_RELEASE_PENDING)
 202                                 /* Ignore short UP event */
 203                                 ts.state = TS_STATE_PRESSED;
 204                         break;
 205
 206                 case 'U':
 207                         ts.state = TS_STATE_RELEASE_PENDING;
 208                         break;
 209
 210                 case 'P':
 211                         if (ts.is_down) /* stylus_action needs a conversion */
 212                                 s3c2410_ts_start_adc_conversion();
 213
 214                         if (unlikely(__kfifo_get(ts.event_fifo,
 215                                                  (unsigned char *)buf,
 216                                                  sizeof(int) * 2)
 217                                      != sizeof(int) * 2))
 218                                 goto ts_exit_error;
 219
 220                         ts_input_report(IE_DOWN, buf);
 221                         ts.state = TS_STATE_PRESSED;
 222                         break;
 223
 224                 default:
 225                         goto ts_exit_error;
 226                 }
 227
 228                 noop_counter = 0;
 229         }
 230
 231         if (noop_counter++ >= 1) {
 232                 noop_counter = 0;
 233                 if (ts.state == TS_STATE_RELEASE_PENDING) {
 234                         /*
 235                          * We delay the UP event for a while to avoid jitter.
 236                          * If we get a DOWN event we do not send it.
 237                          */
 238                         ts_input_report(IE_UP, NULL);
 239                         ts.state = TS_STATE_STANDBY;
 240
 241                         ts_filter_chain_clear(ts.chain);
 242                 }
 243         } else {
 244                 mod_timer(&event_send_timer, jiffies + TS_RELEASE_TIMEOUT);
 245         }
 246
 247         return;
 248
 249 ts_exit_error: /* should not happen unless we have a bug */
 250         printk(KERN_ERR __FILE__ ": event_send_timer_f failed\n");
 251 }
 252
 253 /*
 254  * Manage interrupts.
 255  */
 256
 257 static irqreturn_t stylus_updown(int irq, void *dev_id)
 258 {
 259         unsigned long data0;
 260         unsigned long data1;
 261         int event_type;
 262
 263         data0 = readl(base_addr+S3C2410_ADCDAT0);
 264         data1 = readl(base_addr+S3C2410_ADCDAT1);
 265
 266         ts.is_down = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) &&
 267                                             (!(data1 & S3C2410_ADCDAT0_UPDOWN));
 268
 269         event_type = ts.is_down ? 'D' : 'U';
 270
 271         if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)&event_type,
 272                      sizeof(int)) != sizeof(int))) /* should not happen */
 273                 printk(KERN_ERR __FILE__": stylus_updown lost event!\n");
 274
 275         if (ts.is_down)
 276                 s3c2410_ts_start_adc_conversion();
 277         else
 278                 writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
 279
 280         mod_timer(&event_send_timer, jiffies + 1);
 281
 282         return IRQ_HANDLED;
 283 }
 284
 285 static irqreturn_t stylus_action(int irq, void *dev_id)
 286 {
 287         int buf[3];
 288
 289         /* Grab the ADC results. */
 290         buf[1] = readl(base_addr + S3C2410_ADCDAT0) &
 291                        S3C2410_ADCDAT0_XPDATA_MASK;
 292         buf[2] = readl(base_addr + S3C2410_ADCDAT1) &
 293                        S3C2410_ADCDAT1_YPDATA_MASK;
 294
 295         switch (ts_filter_chain_feed(ts.chain, &buf[1])) {
 296         case 0:
 297                 /* The filter wants more points. */
 298                 s3c2410_ts_start_adc_conversion();
 299                 return IRQ_HANDLED;
 300         case 1:
 301                 /* We have a point from the filters or no filtering enabled. */
 302                 buf[0] = 'P';
 303                 break;
 304         default:
 305                 printk(KERN_ERR __FILE__
 306                        ":%d Invalid ts_filter_chain_feed return value.\n",
 307                        __LINE__);
 308         case -1:
 309                 /* Error. Ignore the event. */
 310                 ts_filter_chain_clear(ts.chain);
 311                 writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
 312                 return IRQ_HANDLED;
 313         };
 314
 315         if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)buf,
 316                      sizeof(int) * 3) != sizeof(int) * 3))
 317                 printk(KERN_ERR __FILE__":stylus_action bug.\n");
 318
 319         writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
 320         mod_timer(&event_send_timer, jiffies + 1);
 321
 322         return IRQ_HANDLED;
 323 }
 324
 325 static struct clk       *adc_clock;
 326
 327 /*
 328  * The functions for inserting/removing us as a module.
 329  */
 330
 331 static int __init s3c2410ts_probe(struct platform_device *pdev)
 332 {
 333         int rc;
 334         struct s3c2410_ts_mach_info *info;
 335         struct input_dev *input_dev;
 336         int ret = 0;
 337
 338         dev_info(&pdev->dev, "Starting\n");
 339
 340         info = (struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
 341
 342         if (!info)
 343         {
 344                 dev_err(&pdev->dev, "Hm... too bad: no platform data for ts\n");
 345                 return -EINVAL;
 346         }
 347
 348 #ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
 349         printk(DEBUG_LVL "Entering s3c2410ts_init\n");
 350 #endif
 351
 352         adc_clock = clk_get(NULL, "adc");
 353         if (!adc_clock) {
 354                 dev_err(&pdev->dev, "failed to get adc clock source\n");
 355                 return -ENOENT;
 356         }
 357         clk_enable(adc_clock);
 358
 359 #ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
 360         printk(DEBUG_LVL "got and enabled clock\n");
 361 #endif
 362
 363         base_addr = ioremap(S3C2410_PA_ADC,0x20);
 364         if (base_addr == NULL) {
 365                 dev_err(&pdev->dev, "Failed to remap register block\n");
 366                 ret = -ENOMEM;
 367                 goto bail0;
 368         }
 369
 370
 371         /* If we acutally are a S3C2410: Configure GPIOs */
 372         if (!strcmp(pdev->name, "s3c2410-ts"))
 373                 s3c2410_ts_connect();
 374
 375         if ((info->presc & 0xff) > 0)
 376                 writel(S3C2410_ADCCON_PRSCEN |
 377                        S3C2410_ADCCON_PRSCVL(info->presc&0xFF),
 378                                                     base_addr + S3C2410_ADCCON);
 379         else
 380                 writel(0, base_addr+S3C2410_ADCCON);
 381
 382         /* Initialise registers */
 383         if ((info->delay & 0xffff) > 0)
 384                 writel(info->delay & 0xffff,  base_addr + S3C2410_ADCDLY);
 385
 386         writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC);
 387
 388         /* Initialise input stuff */
 389         memset(&ts, 0, sizeof(struct s3c2410ts));
 390         input_dev = input_allocate_device();
 391
 392         if (!input_dev) {
 393                 dev_err(&pdev->dev, "Unable to allocate the input device\n");
 394                 ret = -ENOMEM;
 395                 goto bail1;
 396         }
 397
 398         ts.dev = input_dev;
 399         ts.dev->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) |
 400                            BIT_MASK(EV_ABS);
 401         ts.dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 402         input_set_abs_params(ts.dev, ABS_X, 0, 0x3FF, 0, 0);
 403         input_set_abs_params(ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
 404         input_set_abs_params(ts.dev, ABS_PRESSURE, 0, 1, 0, 0);
 405
 406         ts.dev->name = s3c2410ts_name;
 407         ts.dev->id.bustype = BUS_RS232;
 408         ts.dev->id.vendor = 0xDEAD;
 409         ts.dev->id.product = 0xBEEF;
 410         ts.dev->id.version = S3C2410TSVERSION;
 411         ts.state = TS_STATE_STANDBY;
 412         ts.event_fifo = kfifo_alloc(TS_EVENT_FIFO_SIZE, GFP_KERNEL, NULL);
 413         if (IS_ERR(ts.event_fifo)) {
 414                 ret = -EIO;
 415                 goto bail2;
 416         }
 417
 418         /* create the filter chain set up for the 2 coordinates we produce */
 419         ts.chain = ts_filter_chain_create(pdev, info->filter_config, 2);
 420
 421         if (IS_ERR(ts.chain))
 422                 goto bail2;
 423
 424         ts_filter_chain_clear(ts.chain);
 425
 426         /* Get irqs */
 427         if (request_irq(IRQ_ADC, stylus_action, IRQF_SAMPLE_RANDOM,
 428                                                     "s3c2410_action", ts.dev)) {
 429                 dev_err(&pdev->dev, "Could not allocate ts IRQ_ADC !\n");
 430                 iounmap(base_addr);
 431                 ret = -EIO;
 432                 goto bail3;
 433         }
 434         if (request_irq(IRQ_TC, stylus_updown, IRQF_SAMPLE_RANDOM,
 435                         "s3c2410_action", ts.dev)) {
 436                 dev_err(&pdev->dev, "Could not allocate ts IRQ_TC !\n");
 437                 free_irq(IRQ_ADC, ts.dev);
 438                 iounmap(base_addr);
 439                 ret = -EIO;
 440                 goto bail4;
 441         }
 442
 443         dev_info(&pdev->dev, "Successfully loaded\n");
 444
 445         /* All went ok, so register to the input system */
 446         rc = input_register_device(ts.dev);
 447         if (rc) {
 448                 ret = -EIO;
 449                 goto bail5;
 450         }
 451
 452         return 0;
 453
 454 bail5:
 455         free_irq(IRQ_TC, ts.dev);
 456         free_irq(IRQ_ADC, ts.dev);
 457         clk_disable(adc_clock);
 458         iounmap(base_addr);
 459         disable_irq(IRQ_TC);
 460 bail4:
 461         disable_irq(IRQ_ADC);
 462 bail3:
 463         ts_filter_chain_destroy(ts.chain);
 464         kfifo_free(ts.event_fifo);
 465 bail2:
 466         input_unregister_device(ts.dev);
 467 bail1:
 468         iounmap(base_addr);
 469 bail0:
 470
 471         return ret;
 472 }
 473
 474 static int s3c2410ts_remove(struct platform_device *pdev)
 475 {
 476         disable_irq(IRQ_ADC);
 477         disable_irq(IRQ_TC);
 478         free_irq(IRQ_TC,ts.dev);
 479         free_irq(IRQ_ADC,ts.dev);
 480
 481         if (adc_clock) {
 482                 clk_disable(adc_clock);
 483                 clk_put(adc_clock);
 484                 adc_clock = NULL;
 485         }
 486
 487         input_unregister_device(ts.dev);
 488         iounmap(base_addr);
 489
 490         ts_filter_chain_destroy(ts.chain);
 491
 492         kfifo_free(ts.event_fifo);
 493
 494         return 0;
 495 }
 496
 497 #ifdef CONFIG_PM
 498 static int s3c2410ts_suspend(struct platform_device *pdev, pm_message_t state)
 499 {
 500         writel(TSC_SLEEP, base_addr+S3C2410_ADCTSC);
 501         writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_STDBM,
 502                base_addr+S3C2410_ADCCON);
 503
 504         disable_irq(IRQ_ADC);
 505         disable_irq(IRQ_TC);
 506
 507         clk_disable(adc_clock);
 508
 509         return 0;
 510 }
 511
 512 static int s3c2410ts_resume(struct platform_device *pdev)
 513 {
 514         struct s3c2410_ts_mach_info *info =
 515                 ( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
 516
 517         clk_enable(adc_clock);
 518         mdelay(1);
 519
 520         ts_filter_chain_clear(ts.chain);
 521
 522         enable_irq(IRQ_ADC);
 523         enable_irq(IRQ_TC);
 524
 525         if ((info->presc&0xff) > 0)
 526                 writel(S3C2410_ADCCON_PRSCEN |
 527                        S3C2410_ADCCON_PRSCVL(info->presc&0xFF),
 528                                                       base_addr+S3C2410_ADCCON);
 529         else
 530                 writel(0,base_addr+S3C2410_ADCCON);
 531
 532         /* Initialise registers */
 533         if ((info->delay & 0xffff) > 0)
 534                 writel(info->delay & 0xffff,  base_addr+S3C2410_ADCDLY);
 535
 536         writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
 537
 538         return 0;
 539 }
 540
 541 #else
 542 #define s3c2410ts_suspend NULL
 543 #define s3c2410ts_resume  NULL
 544 #endif
 545
 546 static struct platform_driver s3c2410ts_driver = {
 547        .driver         = {
 548                .name   = "s3c2410-ts",
 549                .owner  = THIS_MODULE,
 550        },
 551        .probe          = s3c2410ts_probe,
 552        .remove         = s3c2410ts_remove,
 553        .suspend        = s3c2410ts_suspend,
 554        .resume         = s3c2410ts_resume,
 555
 556 };
 557
 558 static struct platform_driver s3c2440ts_driver = {
 559        .driver         = {
 560                .name   = "s3c2440-ts",
 561                .owner  = THIS_MODULE,
 562        },
 563        .probe          = s3c2410ts_probe,
 564        .remove         = s3c2410ts_remove,
 565        .suspend        = s3c2410ts_suspend,
 566        .resume         = s3c2410ts_resume,
 567
 568 };
 569
 570 static int __init s3c2410ts_init(void)
 571 {
 572         int rc;
 573
 574         rc = platform_driver_register(&s3c2410ts_driver);
 575         if (rc < 0)
 576                 return rc;
 577
 578         rc = platform_driver_register(&s3c2440ts_driver);
 579         if (rc < 0)
 580                 platform_driver_unregister(&s3c2410ts_driver);
 581
 582         return rc;
 583 }
 584
 585 static void __exit s3c2410ts_exit(void)
 586 {
 587         platform_driver_unregister(&s3c2440ts_driver);
 588         platform_driver_unregister(&s3c2410ts_driver);
 589 }
 590
 591 module_init(s3c2410ts_init);
 592 module_exit(s3c2410ts_exit);
 593