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