drivers/input/keyboard/pxa27x_keypad.c

   1 /*
   2  * linux/drivers/input/keyboard/pxa27x_keypad.c
   3  *
   4  * Driver for the pxa27x matrix keyboard controller.
   5  *
   6  * Created:     Feb 22, 2007
   7  * Author:      Rodolfo Giometti <giometti@linux.it>
   8  *
   9  * Based on a previous implementations by Kevin O'Connor
  10  * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
  11  * on some suggestions by Nicolas Pitre <nico@cam.org>.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/input.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/map.h>
  31
  32 #include <mach/hardware.h>
  33 #include <mach/pxa27x_keypad.h>
  34
  35 /*
  36  * Keypad Controller registers
  37  */
  38 #define KPC             0x0000 /* Keypad Control register */
  39 #define KPDK            0x0008 /* Keypad Direct Key register */
  40 #define KPREC           0x0010 /* Keypad Rotary Encoder register */
  41 #define KPMK            0x0018 /* Keypad Matrix Key register */
  42 #define KPAS            0x0020 /* Keypad Automatic Scan register */
  43
  44 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
  45 #define KPASMKP0        0x0028
  46 #define KPASMKP1        0x0030
  47 #define KPASMKP2        0x0038
  48 #define KPASMKP3        0x0040
  49 #define KPKDI           0x0048
  50
  51 /* bit definitions */
  52 #define KPC_MKRN(n)     ((((n) - 1) & 0x7) << 26) /* matrix key row number */
  53 #define KPC_MKCN(n)     ((((n) - 1) & 0x7) << 23) /* matrix key column number */
  54 #define KPC_DKN(n)      ((((n) - 1) & 0x7) << 6)  /* direct key number */
  55
  56 #define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
  57 #define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
  58 #define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
  59 #define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
  60
  61 #define KPC_MS(n)       (0x1 << (13 + (n)))     /* Matrix scan line 'n' */
  62 #define KPC_MS_ALL      (0xff << 13)
  63
  64 #define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
  65 #define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
  66 #define KPC_DK_DEB_SEL  (0x1 <<  9)  /* Direct Keypad Debounce Select */
  67 #define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
  68 #define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
  69 #define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
  70 #define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
  71 #define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
  72 #define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
  73
  74 #define KPDK_DKP        (0x1 << 31)
  75 #define KPDK_DK(n)      ((n) & 0xff)
  76
  77 #define KPREC_OF1       (0x1 << 31)
  78 #define kPREC_UF1       (0x1 << 30)
  79 #define KPREC_OF0       (0x1 << 15)
  80 #define KPREC_UF0       (0x1 << 14)
  81
  82 #define KPREC_RECOUNT0(n)       ((n) & 0xff)
  83 #define KPREC_RECOUNT1(n)       (((n) >> 16) & 0xff)
  84
  85 #define KPMK_MKP        (0x1 << 31)
  86 #define KPAS_SO         (0x1 << 31)
  87 #define KPASMKPx_SO     (0x1 << 31)
  88
  89 #define KPAS_MUKP(n)    (((n) >> 26) & 0x1f)
  90 #define KPAS_RP(n)      (((n) >> 4) & 0xf)
  91 #define KPAS_CP(n)      ((n) & 0xf)
  92
  93 #define KPASMKP_MKC_MASK        (0xff)
  94
  95 #define keypad_readl(off)       __raw_readl(keypad->mmio_base + (off))
  96 #define keypad_writel(off, v)   __raw_writel((v), keypad->mmio_base + (off))
  97
  98 #define MAX_MATRIX_KEY_NUM      (8 * 8)
  99
 100 struct pxa27x_keypad {
 101         struct pxa27x_keypad_platform_data *pdata;
 102
 103         struct clk *clk;
 104         struct input_dev *input_dev;
 105         void __iomem *mmio_base;
 106
 107         int irq;
 108
 109         /* matrix key code map */
 110         unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
 111
 112         /* state row bits of each column scan */
 113         uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
 114         uint32_t direct_key_state;
 115
 116         unsigned int direct_key_mask;
 117
 118         int rotary_rel_code[2];
 119         int rotary_up_key[2];
 120         int rotary_down_key[2];
 121 };
 122
 123 static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
 124 {
 125         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 126         struct input_dev *input_dev = keypad->input_dev;
 127         unsigned int *key;
 128         int i;
 129
 130         key = &pdata->matrix_key_map[0];
 131         for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
 132                 int row = ((*key) >> 28) & 0xf;
 133                 int col = ((*key) >> 24) & 0xf;
 134                 int code = (*key) & 0xffffff;
 135
 136                 keypad->matrix_keycodes[(row << 3) + col] = code;
 137                 set_bit(code, input_dev->keybit);
 138         }
 139
 140         for (i = 0; i < pdata->direct_key_num; i++)
 141                 set_bit(pdata->direct_key_map[i], input_dev->keybit);
 142
 143         keypad->rotary_up_key[0] = pdata->rotary0_up_key;
 144         keypad->rotary_up_key[1] = pdata->rotary1_up_key;
 145         keypad->rotary_down_key[0] = pdata->rotary0_down_key;
 146         keypad->rotary_down_key[1] = pdata->rotary1_down_key;
 147         keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
 148         keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
 149
 150         if (pdata->enable_rotary0) {
 151                 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
 152                         set_bit(pdata->rotary0_up_key, input_dev->keybit);
 153                         set_bit(pdata->rotary0_down_key, input_dev->keybit);
 154                 } else
 155                         set_bit(pdata->rotary0_rel_code, input_dev->relbit);
 156         }
 157
 158         if (pdata->enable_rotary1) {
 159                 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
 160                         set_bit(pdata->rotary1_up_key, input_dev->keybit);
 161                         set_bit(pdata->rotary1_down_key, input_dev->keybit);
 162                 } else
 163                         set_bit(pdata->rotary1_rel_code, input_dev->relbit);
 164         }
 165 }
 166
 167 static inline unsigned int lookup_matrix_keycode(
 168                 struct pxa27x_keypad *keypad, int row, int col)
 169 {
 170         return keypad->matrix_keycodes[(row << 3) + col];
 171 }
 172
 173 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
 174 {
 175         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 176         int row, col, num_keys_pressed = 0;
 177         uint32_t new_state[MAX_MATRIX_KEY_COLS];
 178         uint32_t kpas = keypad_readl(KPAS);
 179
 180         num_keys_pressed = KPAS_MUKP(kpas);
 181
 182         memset(new_state, 0, sizeof(new_state));
 183
 184         if (num_keys_pressed == 0)
 185                 goto scan;
 186
 187         if (num_keys_pressed == 1) {
 188                 col = KPAS_CP(kpas);
 189                 row = KPAS_RP(kpas);
 190
 191                 /* if invalid row/col, treat as no key pressed */
 192                 if (col >= pdata->matrix_key_cols ||
 193                     row >= pdata->matrix_key_rows)
 194                         goto scan;
 195
 196                 new_state[col] = (1 << row);
 197                 goto scan;
 198         }
 199
 200         if (num_keys_pressed > 1) {
 201                 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
 202                 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
 203                 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
 204                 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
 205
 206                 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
 207                 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
 208                 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
 209                 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
 210                 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
 211                 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
 212                 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
 213                 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
 214         }
 215 scan:
 216         for (col = 0; col < pdata->matrix_key_cols; col++) {
 217                 uint32_t bits_changed;
 218
 219                 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
 220                 if (bits_changed == 0)
 221                         continue;
 222
 223                 for (row = 0; row < pdata->matrix_key_rows; row++) {
 224                         if ((bits_changed & (1 << row)) == 0)
 225                                 continue;
 226
 227                         input_report_key(keypad->input_dev,
 228                                 lookup_matrix_keycode(keypad, row, col),
 229                                 new_state[col] & (1 << row));
 230                 }
 231         }
 232         input_sync(keypad->input_dev);
 233         memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
 234 }
 235
 236 #define DEFAULT_KPREC   (0x007f007f)
 237
 238 static inline int rotary_delta(uint32_t kprec)
 239 {
 240         if (kprec & KPREC_OF0)
 241                 return (kprec & 0xff) + 0x7f;
 242         else if (kprec & KPREC_UF0)
 243                 return (kprec & 0xff) - 0x7f - 0xff;
 244         else
 245                 return (kprec & 0xff) - 0x7f;
 246 }
 247
 248 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
 249 {
 250         struct input_dev *dev = keypad->input_dev;
 251
 252         if (delta == 0)
 253                 return;
 254
 255         if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
 256                 int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
 257                                             keypad->rotary_down_key[r];
 258
 259                 /* simulate a press-n-release */
 260                 input_report_key(dev, keycode, 1);
 261                 input_sync(dev);
 262                 input_report_key(dev, keycode, 0);
 263                 input_sync(dev);
 264         } else {
 265                 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
 266                 input_sync(dev);
 267         }
 268 }
 269
 270 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
 271 {
 272         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 273         uint32_t kprec;
 274
 275         /* read and reset to default count value */
 276         kprec = keypad_readl(KPREC);
 277         keypad_writel(KPREC, DEFAULT_KPREC);
 278
 279         if (pdata->enable_rotary0)
 280                 report_rotary_event(keypad, 0, rotary_delta(kprec));
 281
 282         if (pdata->enable_rotary1)
 283                 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
 284 }
 285
 286 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
 287 {
 288         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 289         unsigned int new_state;
 290         uint32_t kpdk, bits_changed;
 291         int i;
 292
 293         kpdk = keypad_readl(KPDK);
 294
 295         if (pdata->enable_rotary0 || pdata->enable_rotary1)
 296                 pxa27x_keypad_scan_rotary(keypad);
 297
 298         if (pdata->direct_key_map == NULL)
 299                 return;
 300
 301         new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
 302         bits_changed = keypad->direct_key_state ^ new_state;
 303
 304         if (bits_changed == 0)
 305                 return;
 306
 307         for (i = 0; i < pdata->direct_key_num; i++) {
 308                 if (bits_changed & (1 << i))
 309                         input_report_key(keypad->input_dev,
 310                                         pdata->direct_key_map[i],
 311                                         (new_state & (1 << i)));
 312         }
 313         input_sync(keypad->input_dev);
 314         keypad->direct_key_state = new_state;
 315 }
 316
 317 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 318 {
 319         struct pxa27x_keypad *keypad = dev_id;
 320         unsigned long kpc = keypad_readl(KPC);
 321
 322         if (kpc & KPC_DI)
 323                 pxa27x_keypad_scan_direct(keypad);
 324
 325         if (kpc & KPC_MI)
 326                 pxa27x_keypad_scan_matrix(keypad);
 327
 328         return IRQ_HANDLED;
 329 }
 330
 331 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
 332 {
 333         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 334         unsigned int mask = 0, direct_key_num = 0;
 335         unsigned long kpc = 0;
 336
 337         /* enable matrix keys with automatic scan */
 338         if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
 339                 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
 340                 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
 341                        KPC_MKCN(pdata->matrix_key_cols);
 342         }
 343
 344         /* enable rotary key, debounce interval same as direct keys */
 345         if (pdata->enable_rotary0) {
 346                 mask |= 0x03;
 347                 direct_key_num = 2;
 348                 kpc |= KPC_REE0;
 349         }
 350
 351         if (pdata->enable_rotary1) {
 352                 mask |= 0x0c;
 353                 direct_key_num = 4;
 354                 kpc |= KPC_REE1;
 355         }
 356
 357         if (pdata->direct_key_num > direct_key_num)
 358                 direct_key_num = pdata->direct_key_num;
 359
 360         keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
 361
 362         /* enable direct key */
 363         if (direct_key_num)
 364                 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
 365
 366         keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
 367         keypad_writel(KPREC, DEFAULT_KPREC);
 368         keypad_writel(KPKDI, pdata->debounce_interval);
 369 }
 370
 371 static int pxa27x_keypad_open(struct input_dev *dev)
 372 {
 373         struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 374
 375         /* Enable unit clock */
 376         clk_enable(keypad->clk);
 377         pxa27x_keypad_config(keypad);
 378
 379         return 0;
 380 }
 381
 382 static void pxa27x_keypad_close(struct input_dev *dev)
 383 {
 384         struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 385
 386         /* Disable clock unit */
 387         clk_disable(keypad->clk);
 388 }
 389
 390 #ifdef CONFIG_PM
 391 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
 392 {
 393         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 394
 395         clk_disable(keypad->clk);
 396
 397         if (device_may_wakeup(&pdev->dev))
 398                 enable_irq_wake(keypad->irq);
 399
 400         return 0;
 401 }
 402
 403 static int pxa27x_keypad_resume(struct platform_device *pdev)
 404 {
 405         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 406         struct input_dev *input_dev = keypad->input_dev;
 407
 408         if (device_may_wakeup(&pdev->dev))
 409                 disable_irq_wake(keypad->irq);
 410
 411         mutex_lock(&input_dev->mutex);
 412
 413         if (input_dev->users) {
 414                 /* Enable unit clock */
 415                 clk_enable(keypad->clk);
 416                 pxa27x_keypad_config(keypad);
 417         }
 418
 419         mutex_unlock(&input_dev->mutex);
 420
 421         return 0;
 422 }
 423 #else
 424 #define pxa27x_keypad_suspend   NULL
 425 #define pxa27x_keypad_resume    NULL
 426 #endif
 427
 428 #define res_size(res)   ((res)->end - (res)->start + 1)
 429
 430 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 431 {
 432         struct pxa27x_keypad *keypad;
 433         struct input_dev *input_dev;
 434         struct resource *res;
 435         int irq, error;
 436
 437         keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
 438         if (keypad == NULL) {
 439                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 440                 return -ENOMEM;
 441         }
 442
 443         keypad->pdata = pdev->dev.platform_data;
 444         if (keypad->pdata == NULL) {
 445                 dev_err(&pdev->dev, "no platform data defined\n");
 446                 error = -EINVAL;
 447                 goto failed_free;
 448         }
 449
 450         irq = platform_get_irq(pdev, 0);
 451         if (irq < 0) {
 452                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 453                 error = -ENXIO;
 454                 goto failed_free;
 455         }
 456
 457         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 458         if (res == NULL) {
 459                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 460                 error = -ENXIO;
 461                 goto failed_free;
 462         }
 463
 464         res = request_mem_region(res->start, res_size(res), pdev->name);
 465         if (res == NULL) {
 466                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 467                 error = -EBUSY;
 468                 goto failed_free;
 469         }
 470
 471         keypad->mmio_base = ioremap(res->start, res_size(res));
 472         if (keypad->mmio_base == NULL) {
 473                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 474                 error = -ENXIO;
 475                 goto failed_free_mem;
 476         }
 477
 478         keypad->clk = clk_get(&pdev->dev, NULL);
 479         if (IS_ERR(keypad->clk)) {
 480                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 481                 error = PTR_ERR(keypad->clk);
 482                 goto failed_free_io;
 483         }
 484
 485         /* Create and register the input driver. */
 486         input_dev = input_allocate_device();
 487         if (!input_dev) {
 488                 dev_err(&pdev->dev, "failed to allocate input device\n");
 489                 error = -ENOMEM;
 490                 goto failed_put_clk;
 491         }
 492
 493         input_dev->name = pdev->name;
 494         input_dev->id.bustype = BUS_HOST;
 495         input_dev->open = pxa27x_keypad_open;
 496         input_dev->close = pxa27x_keypad_close;
 497         input_dev->dev.parent = &pdev->dev;
 498
 499         keypad->input_dev = input_dev;
 500         input_set_drvdata(input_dev, keypad);
 501
 502         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 503         if ((keypad->pdata->enable_rotary0 &&
 504                         keypad->pdata->rotary0_rel_code) ||
 505             (keypad->pdata->enable_rotary1 &&
 506                         keypad->pdata->rotary1_rel_code)) {
 507                 input_dev->evbit[0] |= BIT_MASK(EV_REL);
 508         }
 509
 510         pxa27x_keypad_build_keycode(keypad);
 511         platform_set_drvdata(pdev, keypad);
 512
 513         error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
 514                             pdev->name, keypad);
 515         if (error) {
 516                 dev_err(&pdev->dev, "failed to request IRQ\n");
 517                 goto failed_free_dev;
 518         }
 519
 520         keypad->irq = irq;
 521
 522         /* Register the input device */
 523         error = input_register_device(input_dev);
 524         if (error) {
 525                 dev_err(&pdev->dev, "failed to register input device\n");
 526                 goto failed_free_irq;
 527         }
 528
 529         device_init_wakeup(&pdev->dev, 1);
 530
 531         return 0;
 532
 533 failed_free_irq:
 534         free_irq(irq, pdev);
 535         platform_set_drvdata(pdev, NULL);
 536 failed_free_dev:
 537         input_free_device(input_dev);
 538 failed_put_clk:
 539         clk_put(keypad->clk);
 540 failed_free_io:
 541         iounmap(keypad->mmio_base);
 542 failed_free_mem:
 543         release_mem_region(res->start, res_size(res));
 544 failed_free:
 545         kfree(keypad);
 546         return error;
 547 }
 548
 549 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
 550 {
 551         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 552         struct resource *res;
 553
 554         free_irq(keypad->irq, pdev);
 555
 556         clk_disable(keypad->clk);
 557         clk_put(keypad->clk);
 558
 559         input_unregister_device(keypad->input_dev);
 560         input_free_device(keypad->input_dev);
 561
 562         iounmap(keypad->mmio_base);
 563
 564         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 565         release_mem_region(res->start, res_size(res));
 566
 567         platform_set_drvdata(pdev, NULL);
 568         kfree(keypad);
 569         return 0;
 570 }
 571
 572 /* work with hotplug and coldplug */
 573 MODULE_ALIAS("platform:pxa27x-keypad");
 574
 575 static struct platform_driver pxa27x_keypad_driver = {
 576         .probe          = pxa27x_keypad_probe,
 577         .remove         = __devexit_p(pxa27x_keypad_remove),
 578         .suspend        = pxa27x_keypad_suspend,
 579         .resume         = pxa27x_keypad_resume,
 580         .driver         = {
 581                 .name   = "pxa27x-keypad",
 582                 .owner  = THIS_MODULE,
 583         },
 584 };
 585
 586 static int __init pxa27x_keypad_init(void)
 587 {
 588         return platform_driver_register(&pxa27x_keypad_driver);
 589 }
 590
 591 static void __exit pxa27x_keypad_exit(void)
 592 {
 593         platform_driver_unregister(&pxa27x_keypad_driver);
 594 }
 595
 596 module_init(pxa27x_keypad_init);
 597 module_exit(pxa27x_keypad_exit);
 598
 599 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
 600 MODULE_LICENSE("GPL");