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@fluxnic.net>.
  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/interrupt.h>
  22 #include <linux/input.h>
  23 #include <linux/io.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28 #include <linux/input/matrix_keypad.h>
  29 #include <linux/slab.h>
  30 #include <linux/of.h>
  31
  32 #include <linux/platform_data/keypad-pxa27x.h>
  33 /*
  34  * Keypad Controller registers
  35  */
  36 #define KPC             0x0000 /* Keypad Control register */
  37 #define KPDK            0x0008 /* Keypad Direct Key register */
  38 #define KPREC           0x0010 /* Keypad Rotary Encoder register */
  39 #define KPMK            0x0018 /* Keypad Matrix Key register */
  40 #define KPAS            0x0020 /* Keypad Automatic Scan register */
  41
  42 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
  43 #define KPASMKP0        0x0028
  44 #define KPASMKP1        0x0030
  45 #define KPASMKP2        0x0038
  46 #define KPASMKP3        0x0040
  47 #define KPKDI           0x0048
  48
  49 /* bit definitions */
  50 #define KPC_MKRN(n)     ((((n) - 1) & 0x7) << 26) /* matrix key row number */
  51 #define KPC_MKCN(n)     ((((n) - 1) & 0x7) << 23) /* matrix key column number */
  52 #define KPC_DKN(n)      ((((n) - 1) & 0x7) << 6)  /* direct key number */
  53
  54 #define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
  55 #define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
  56 #define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
  57 #define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
  58
  59 #define KPC_MS(n)       (0x1 << (13 + (n)))     /* Matrix scan line 'n' */
  60 #define KPC_MS_ALL      (0xff << 13)
  61
  62 #define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
  63 #define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
  64 #define KPC_DK_DEB_SEL  (0x1 <<  9)  /* Direct Keypad Debounce Select */
  65 #define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
  66 #define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
  67 #define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
  68 #define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
  69 #define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
  70 #define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
  71
  72 #define KPDK_DKP        (0x1 << 31)
  73 #define KPDK_DK(n)      ((n) & 0xff)
  74
  75 #define KPREC_OF1       (0x1 << 31)
  76 #define kPREC_UF1       (0x1 << 30)
  77 #define KPREC_OF0       (0x1 << 15)
  78 #define KPREC_UF0       (0x1 << 14)
  79
  80 #define KPREC_RECOUNT0(n)       ((n) & 0xff)
  81 #define KPREC_RECOUNT1(n)       (((n) >> 16) & 0xff)
  82
  83 #define KPMK_MKP        (0x1 << 31)
  84 #define KPAS_SO         (0x1 << 31)
  85 #define KPASMKPx_SO     (0x1 << 31)
  86
  87 #define KPAS_MUKP(n)    (((n) >> 26) & 0x1f)
  88 #define KPAS_RP(n)      (((n) >> 4) & 0xf)
  89 #define KPAS_CP(n)      ((n) & 0xf)
  90
  91 #define KPASMKP_MKC_MASK        (0xff)
  92
  93 #define keypad_readl(off)       __raw_readl(keypad->mmio_base + (off))
  94 #define keypad_writel(off, v)   __raw_writel((v), keypad->mmio_base + (off))
  95
  96 #define MAX_MATRIX_KEY_NUM      (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
  97 #define MAX_KEYPAD_KEYS         (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
  98
  99 struct pxa27x_keypad {
 100         const struct pxa27x_keypad_platform_data *pdata;
 101
 102         struct clk *clk;
 103         struct input_dev *input_dev;
 104         void __iomem *mmio_base;
 105
 106         int irq;
 107
 108         unsigned short keycodes[MAX_KEYPAD_KEYS];
 109         int rotary_rel_code[2];
 110
 111         unsigned int row_shift;
 112
 113         /* state row bits of each column scan */
 114         uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
 115         uint32_t direct_key_state;
 116
 117         unsigned int direct_key_mask;
 118 };
 119
 120 #ifdef CONFIG_OF
 121 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
 122                                 struct pxa27x_keypad_platform_data *pdata)
 123 {
 124         struct input_dev *input_dev = keypad->input_dev;
 125         struct device *dev = input_dev->dev.parent;
 126         u32 rows, cols;
 127         int error;
 128
 129         error = matrix_keypad_parse_of_params(dev, &rows, &cols);
 130         if (error)
 131                 return error;
 132
 133         if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
 134                 dev_err(dev, "rows or cols exceeds maximum value\n");
 135                 return -EINVAL;
 136         }
 137
 138         pdata->matrix_key_rows = rows;
 139         pdata->matrix_key_cols = cols;
 140
 141         error = matrix_keypad_build_keymap(NULL, NULL,
 142                                            pdata->matrix_key_rows,
 143                                            pdata->matrix_key_cols,
 144                                            keypad->keycodes, input_dev);
 145         if (error)
 146                 return error;
 147
 148         return 0;
 149 }
 150
 151 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
 152                                 struct pxa27x_keypad_platform_data *pdata)
 153 {
 154         struct input_dev *input_dev = keypad->input_dev;
 155         struct device *dev = input_dev->dev.parent;
 156         struct device_node *np = dev->of_node;
 157         const __be16 *prop;
 158         unsigned short code;
 159         unsigned int proplen, size;
 160         int i;
 161         int error;
 162
 163         error = of_property_read_u32(np, "marvell,direct-key-count",
 164                                      &pdata->direct_key_num);
 165         if (error) {
 166                 /*
 167                  * If do not have marvel,direct-key-count defined,
 168                  * it means direct key is not supported.
 169                  */
 170                 return error == -EINVAL ? 0 : error;
 171         }
 172
 173         error = of_property_read_u32(np, "marvell,direct-key-mask",
 174                                      &pdata->direct_key_mask);
 175         if (error) {
 176                 if (error != -EINVAL)
 177                         return error;
 178
 179                 /*
 180                  * If marvell,direct-key-mask is not defined, driver will use
 181                  * default value. Default value is set when configure the keypad.
 182                  */
 183                 pdata->direct_key_mask = 0;
 184         }
 185
 186         pdata->direct_key_low_active = of_property_read_bool(np,
 187                                         "marvell,direct-key-low-active");
 188
 189         prop = of_get_property(np, "marvell,direct-key-map", &proplen);
 190         if (!prop)
 191                 return -EINVAL;
 192
 193         if (proplen % sizeof(u16))
 194                 return -EINVAL;
 195
 196         size = proplen / sizeof(u16);
 197
 198         /* Only MAX_DIRECT_KEY_NUM is accepted.*/
 199         if (size > MAX_DIRECT_KEY_NUM)
 200                 return -EINVAL;
 201
 202         for (i = 0; i < size; i++) {
 203                 code = be16_to_cpup(prop + i);
 204                 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
 205                 __set_bit(code, input_dev->keybit);
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
 212                                 struct pxa27x_keypad_platform_data *pdata)
 213 {
 214         const __be32 *prop;
 215         int i, relkey_ret;
 216         unsigned int code, proplen;
 217         const char *rotaryname[2] = {
 218                         "marvell,rotary0", "marvell,rotary1"};
 219         const char relkeyname[] = {"marvell,rotary-rel-key"};
 220         struct input_dev *input_dev = keypad->input_dev;
 221         struct device *dev = input_dev->dev.parent;
 222         struct device_node *np = dev->of_node;
 223
 224         relkey_ret = of_property_read_u32(np, relkeyname, &code);
 225         /* if can read correct rotary key-code, we do not need this. */
 226         if (relkey_ret == 0) {
 227                 unsigned short relcode;
 228
 229                 /* rotary0 taks lower half, rotary1 taks upper half. */
 230                 relcode = code & 0xffff;
 231                 pdata->rotary0_rel_code = (code & 0xffff);
 232                 __set_bit(relcode, input_dev->relbit);
 233
 234                 relcode = code >> 16;
 235                 pdata->rotary1_rel_code = relcode;
 236                 __set_bit(relcode, input_dev->relbit);
 237         }
 238
 239         for (i = 0; i < 2; i++) {
 240                 prop = of_get_property(np, rotaryname[i], &proplen);
 241                 /*
 242                  * If the prop is not set, it means keypad does not need
 243                  * initialize the rotaryX.
 244                  */
 245                 if (!prop)
 246                         continue;
 247
 248                 code = be32_to_cpup(prop);
 249                 /*
 250                  * Not all up/down key code are valid.
 251                  * Now we depends on direct-rel-code.
 252                  */
 253                 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
 254                         return relkey_ret;
 255                 } else {
 256                         unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
 257                         unsigned short keycode;
 258
 259                         keycode = code & 0xffff;
 260                         keypad->keycodes[n] = keycode;
 261                         __set_bit(keycode, input_dev->keybit);
 262
 263                         keycode = code >> 16;
 264                         keypad->keycodes[n + 1] = keycode;
 265                         __set_bit(keycode, input_dev->keybit);
 266
 267                         if (i == 0)
 268                                 pdata->rotary0_rel_code = -1;
 269                         else
 270                                 pdata->rotary1_rel_code = -1;
 271                 }
 272                 if (i == 0)
 273                         pdata->enable_rotary0 = 1;
 274                 else
 275                         pdata->enable_rotary1 = 1;
 276         }
 277
 278         keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
 279         keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
 280
 281         return 0;
 282 }
 283
 284 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
 285 {
 286         struct input_dev *input_dev = keypad->input_dev;
 287         struct device *dev = input_dev->dev.parent;
 288         struct device_node *np = dev->of_node;
 289         struct pxa27x_keypad_platform_data *pdata;
 290         int error;
 291
 292         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 293         if (!pdata) {
 294                 dev_err(dev, "failed to allocate memory for pdata\n");
 295                 return -ENOMEM;
 296         }
 297
 298         error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
 299         if (error) {
 300                 dev_err(dev, "failed to parse matrix key\n");
 301                 return error;
 302         }
 303
 304         error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
 305         if (error) {
 306                 dev_err(dev, "failed to parse direct key\n");
 307                 return error;
 308         }
 309
 310         error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
 311         if (error) {
 312                 dev_err(dev, "failed to parse rotary key\n");
 313                 return error;
 314         }
 315
 316         error = of_property_read_u32(np, "marvell,debounce-interval",
 317                                      &pdata->debounce_interval);
 318         if (error) {
 319                 dev_err(dev, "failed to parse debpunce-interval\n");
 320                 return error;
 321         }
 322
 323         /*
 324          * The keycodes may not only includes matrix key but also the direct
 325          * key or rotary key.
 326          */
 327         input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
 328
 329         keypad->pdata = pdata;
 330         return 0;
 331 }
 332
 333 #else
 334
 335 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
 336 {
 337         dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
 338
 339         return -EINVAL;
 340 }
 341
 342 #endif
 343
 344 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
 345 {
 346         const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 347         struct input_dev *input_dev = keypad->input_dev;
 348         unsigned short keycode;
 349         int i;
 350         int error;
 351
 352         error = matrix_keypad_build_keymap(pdata->matrix_keymap_data, NULL,
 353                                            pdata->matrix_key_rows,
 354                                            pdata->matrix_key_cols,
 355                                            keypad->keycodes, input_dev);
 356         if (error)
 357                 return error;
 358
 359         /*
 360          * The keycodes may not only include matrix keys but also the direct
 361          * or rotary keys.
 362          */
 363         input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
 364
 365         /* For direct keys. */
 366         for (i = 0; i < pdata->direct_key_num; i++) {
 367                 keycode = pdata->direct_key_map[i];
 368                 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
 369                 __set_bit(keycode, input_dev->keybit);
 370         }
 371
 372         if (pdata->enable_rotary0) {
 373                 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
 374                         keycode = pdata->rotary0_up_key;
 375                         keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
 376                         __set_bit(keycode, input_dev->keybit);
 377
 378                         keycode = pdata->rotary0_down_key;
 379                         keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
 380                         __set_bit(keycode, input_dev->keybit);
 381
 382                         keypad->rotary_rel_code[0] = -1;
 383                 } else {
 384                         keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
 385                         __set_bit(pdata->rotary0_rel_code, input_dev->relbit);
 386                 }
 387         }
 388
 389         if (pdata->enable_rotary1) {
 390                 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
 391                         keycode = pdata->rotary1_up_key;
 392                         keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
 393                         __set_bit(keycode, input_dev->keybit);
 394
 395                         keycode = pdata->rotary1_down_key;
 396                         keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
 397                         __set_bit(keycode, input_dev->keybit);
 398
 399                         keypad->rotary_rel_code[1] = -1;
 400                 } else {
 401                         keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
 402                         __set_bit(pdata->rotary1_rel_code, input_dev->relbit);
 403                 }
 404         }
 405
 406         __clear_bit(KEY_RESERVED, input_dev->keybit);
 407
 408         return 0;
 409 }
 410
 411 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
 412 {
 413         const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 414         struct input_dev *input_dev = keypad->input_dev;
 415         int row, col, num_keys_pressed = 0;
 416         uint32_t new_state[MAX_MATRIX_KEY_COLS];
 417         uint32_t kpas = keypad_readl(KPAS);
 418
 419         num_keys_pressed = KPAS_MUKP(kpas);
 420
 421         memset(new_state, 0, sizeof(new_state));
 422
 423         if (num_keys_pressed == 0)
 424                 goto scan;
 425
 426         if (num_keys_pressed == 1) {
 427                 col = KPAS_CP(kpas);
 428                 row = KPAS_RP(kpas);
 429
 430                 /* if invalid row/col, treat as no key pressed */
 431                 if (col >= pdata->matrix_key_cols ||
 432                     row >= pdata->matrix_key_rows)
 433                         goto scan;
 434
 435                 new_state[col] = (1 << row);
 436                 goto scan;
 437         }
 438
 439         if (num_keys_pressed > 1) {
 440                 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
 441                 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
 442                 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
 443                 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
 444
 445                 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
 446                 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
 447                 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
 448                 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
 449                 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
 450                 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
 451                 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
 452                 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
 453         }
 454 scan:
 455         for (col = 0; col < pdata->matrix_key_cols; col++) {
 456                 uint32_t bits_changed;
 457                 int code;
 458
 459                 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
 460                 if (bits_changed == 0)
 461                         continue;
 462
 463                 for (row = 0; row < pdata->matrix_key_rows; row++) {
 464                         if ((bits_changed & (1 << row)) == 0)
 465                                 continue;
 466
 467                         code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
 468
 469                         input_event(input_dev, EV_MSC, MSC_SCAN, code);
 470                         input_report_key(input_dev, keypad->keycodes[code],
 471                                          new_state[col] & (1 << row));
 472                 }
 473         }
 474         input_sync(input_dev);
 475         memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
 476 }
 477
 478 #define DEFAULT_KPREC   (0x007f007f)
 479
 480 static inline int rotary_delta(uint32_t kprec)
 481 {
 482         if (kprec & KPREC_OF0)
 483                 return (kprec & 0xff) + 0x7f;
 484         else if (kprec & KPREC_UF0)
 485                 return (kprec & 0xff) - 0x7f - 0xff;
 486         else
 487                 return (kprec & 0xff) - 0x7f;
 488 }
 489
 490 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
 491 {
 492         struct input_dev *dev = keypad->input_dev;
 493
 494         if (delta == 0)
 495                 return;
 496
 497         if (keypad->rotary_rel_code[r] == -1) {
 498                 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
 499                 unsigned char keycode = keypad->keycodes[code];
 500
 501                 /* simulate a press-n-release */
 502                 input_event(dev, EV_MSC, MSC_SCAN, code);
 503                 input_report_key(dev, keycode, 1);
 504                 input_sync(dev);
 505                 input_event(dev, EV_MSC, MSC_SCAN, code);
 506                 input_report_key(dev, keycode, 0);
 507                 input_sync(dev);
 508         } else {
 509                 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
 510                 input_sync(dev);
 511         }
 512 }
 513
 514 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
 515 {
 516         const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 517         uint32_t kprec;
 518
 519         /* read and reset to default count value */
 520         kprec = keypad_readl(KPREC);
 521         keypad_writel(KPREC, DEFAULT_KPREC);
 522
 523         if (pdata->enable_rotary0)
 524                 report_rotary_event(keypad, 0, rotary_delta(kprec));
 525
 526         if (pdata->enable_rotary1)
 527                 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
 528 }
 529
 530 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
 531 {
 532         const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 533         struct input_dev *input_dev = keypad->input_dev;
 534         unsigned int new_state;
 535         uint32_t kpdk, bits_changed;
 536         int i;
 537
 538         kpdk = keypad_readl(KPDK);
 539
 540         if (pdata->enable_rotary0 || pdata->enable_rotary1)
 541                 pxa27x_keypad_scan_rotary(keypad);
 542
 543         /*
 544          * The KPDR_DK only output the key pin level, so it relates to board,
 545          * and low level may be active.
 546          */
 547         if (pdata->direct_key_low_active)
 548                 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
 549         else
 550                 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
 551
 552         bits_changed = keypad->direct_key_state ^ new_state;
 553
 554         if (bits_changed == 0)
 555                 return;
 556
 557         for (i = 0; i < pdata->direct_key_num; i++) {
 558                 if (bits_changed & (1 << i)) {
 559                         int code = MAX_MATRIX_KEY_NUM + i;
 560
 561                         input_event(input_dev, EV_MSC, MSC_SCAN, code);
 562                         input_report_key(input_dev, keypad->keycodes[code],
 563                                          new_state & (1 << i));
 564                 }
 565         }
 566         input_sync(input_dev);
 567         keypad->direct_key_state = new_state;
 568 }
 569
 570 static void clear_wakeup_event(struct pxa27x_keypad *keypad)
 571 {
 572         const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 573
 574         if (pdata->clear_wakeup_event)
 575                 (pdata->clear_wakeup_event)();
 576 }
 577
 578 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 579 {
 580         struct pxa27x_keypad *keypad = dev_id;
 581         unsigned long kpc = keypad_readl(KPC);
 582
 583         clear_wakeup_event(keypad);
 584
 585         if (kpc & KPC_DI)
 586                 pxa27x_keypad_scan_direct(keypad);
 587
 588         if (kpc & KPC_MI)
 589                 pxa27x_keypad_scan_matrix(keypad);
 590
 591         return IRQ_HANDLED;
 592 }
 593
 594 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
 595 {
 596         const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 597         unsigned int mask = 0, direct_key_num = 0;
 598         unsigned long kpc = 0;
 599
 600         /* clear pending interrupt bit */
 601         keypad_readl(KPC);
 602
 603         /* enable matrix keys with automatic scan */
 604         if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
 605                 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
 606                 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
 607                        KPC_MKCN(pdata->matrix_key_cols);
 608         }
 609
 610         /* enable rotary key, debounce interval same as direct keys */
 611         if (pdata->enable_rotary0) {
 612                 mask |= 0x03;
 613                 direct_key_num = 2;
 614                 kpc |= KPC_REE0;
 615         }
 616
 617         if (pdata->enable_rotary1) {
 618                 mask |= 0x0c;
 619                 direct_key_num = 4;
 620                 kpc |= KPC_REE1;
 621         }
 622
 623         if (pdata->direct_key_num > direct_key_num)
 624                 direct_key_num = pdata->direct_key_num;
 625
 626         /*
 627          * Direct keys usage may not start from KP_DKIN0, check the platfrom
 628          * mask data to config the specific.
 629          */
 630         if (pdata->direct_key_mask)
 631                 keypad->direct_key_mask = pdata->direct_key_mask;
 632         else
 633                 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
 634
 635         /* enable direct key */
 636         if (direct_key_num)
 637                 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
 638
 639         keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
 640         keypad_writel(KPREC, DEFAULT_KPREC);
 641         keypad_writel(KPKDI, pdata->debounce_interval);
 642 }
 643
 644 static int pxa27x_keypad_open(struct input_dev *dev)
 645 {
 646         struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 647
 648         /* Enable unit clock */
 649         clk_prepare_enable(keypad->clk);
 650         pxa27x_keypad_config(keypad);
 651
 652         return 0;
 653 }
 654
 655 static void pxa27x_keypad_close(struct input_dev *dev)
 656 {
 657         struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 658
 659         /* Disable clock unit */
 660         clk_disable_unprepare(keypad->clk);
 661 }
 662
 663 #ifdef CONFIG_PM_SLEEP
 664 static int pxa27x_keypad_suspend(struct device *dev)
 665 {
 666         struct platform_device *pdev = to_platform_device(dev);
 667         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 668
 669         /*
 670          * If the keypad is used a wake up source, clock can not be disabled.
 671          * Or it can not detect the key pressing.
 672          */
 673         if (device_may_wakeup(&pdev->dev))
 674                 enable_irq_wake(keypad->irq);
 675         else
 676                 clk_disable_unprepare(keypad->clk);
 677
 678         return 0;
 679 }
 680
 681 static int pxa27x_keypad_resume(struct device *dev)
 682 {
 683         struct platform_device *pdev = to_platform_device(dev);
 684         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 685         struct input_dev *input_dev = keypad->input_dev;
 686
 687         /*
 688          * If the keypad is used as wake up source, the clock is not turned
 689          * off. So do not need configure it again.
 690          */
 691         if (device_may_wakeup(&pdev->dev)) {
 692                 disable_irq_wake(keypad->irq);
 693         } else {
 694                 mutex_lock(&input_dev->mutex);
 695
 696                 if (input_dev->users) {
 697                         /* Enable unit clock */
 698                         clk_prepare_enable(keypad->clk);
 699                         pxa27x_keypad_config(keypad);
 700                 }
 701
 702                 mutex_unlock(&input_dev->mutex);
 703         }
 704
 705         return 0;
 706 }
 707 #endif
 708
 709 static SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops,
 710                          pxa27x_keypad_suspend, pxa27x_keypad_resume);
 711
 712
 713 static int pxa27x_keypad_probe(struct platform_device *pdev)
 714 {
 715         const struct pxa27x_keypad_platform_data *pdata =
 716                                         dev_get_platdata(&pdev->dev);
 717         struct device_node *np = pdev->dev.of_node;
 718         struct pxa27x_keypad *keypad;
 719         struct input_dev *input_dev;
 720         struct resource *res;
 721         int irq, error;
 722
 723         /* Driver need build keycode from device tree or pdata */
 724         if (!np && !pdata)
 725                 return -EINVAL;
 726
 727         irq = platform_get_irq(pdev, 0);
 728         if (irq < 0) {
 729                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 730                 return -ENXIO;
 731         }
 732
 733         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 734         if (res == NULL) {
 735                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 736                 return -ENXIO;
 737         }
 738
 739         keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad),
 740                               GFP_KERNEL);
 741         if (!keypad)
 742                 return -ENOMEM;
 743
 744         input_dev = devm_input_allocate_device(&pdev->dev);
 745         if (!input_dev)
 746                 return -ENOMEM;
 747
 748         keypad->pdata = pdata;
 749         keypad->input_dev = input_dev;
 750         keypad->irq = irq;
 751
 752         keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res);
 753         if (IS_ERR(keypad->mmio_base))
 754                 return PTR_ERR(keypad->mmio_base);
 755
 756         keypad->clk = devm_clk_get(&pdev->dev, NULL);
 757         if (IS_ERR(keypad->clk)) {
 758                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 759                 return PTR_ERR(keypad->clk);
 760         }
 761
 762         input_dev->name = pdev->name;
 763         input_dev->id.bustype = BUS_HOST;
 764         input_dev->open = pxa27x_keypad_open;
 765         input_dev->close = pxa27x_keypad_close;
 766         input_dev->dev.parent = &pdev->dev;
 767
 768         input_dev->keycode = keypad->keycodes;
 769         input_dev->keycodesize = sizeof(keypad->keycodes[0]);
 770         input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
 771
 772         input_set_drvdata(input_dev, keypad);
 773
 774         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 775         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 776
 777         if (pdata) {
 778                 error = pxa27x_keypad_build_keycode(keypad);
 779         } else {
 780                 error = pxa27x_keypad_build_keycode_from_dt(keypad);
 781                 /*
 782                  * Data that we get from DT resides in dynamically
 783                  * allocated memory so we need to update our pdata
 784                  * pointer.
 785                  */
 786                 pdata = keypad->pdata;
 787         }
 788         if (error) {
 789                 dev_err(&pdev->dev, "failed to build keycode\n");
 790                 return error;
 791         }
 792
 793         keypad->row_shift = get_count_order(pdata->matrix_key_cols);
 794
 795         if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
 796             (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
 797                 input_dev->evbit[0] |= BIT_MASK(EV_REL);
 798         }
 799
 800         error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler,
 801                                  0, pdev->name, keypad);
 802         if (error) {
 803                 dev_err(&pdev->dev, "failed to request IRQ\n");
 804                 return error;
 805         }
 806
 807         /* Register the input device */
 808         error = input_register_device(input_dev);
 809         if (error) {
 810                 dev_err(&pdev->dev, "failed to register input device\n");
 811                 return error;
 812         }
 813
 814         platform_set_drvdata(pdev, keypad);
 815         device_init_wakeup(&pdev->dev, 1);
 816
 817         return 0;
 818 }
 819
 820 #ifdef CONFIG_OF
 821 static const struct of_device_id pxa27x_keypad_dt_match[] = {
 822         { .compatible = "marvell,pxa27x-keypad" },
 823         {},
 824 };
 825 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
 826 #endif
 827
 828 static struct platform_driver pxa27x_keypad_driver = {
 829         .probe          = pxa27x_keypad_probe,
 830         .driver         = {
 831                 .name   = "pxa27x-keypad",
 832                 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
 833                 .pm     = &pxa27x_keypad_pm_ops,
 834         },
 835 };
 836 module_platform_driver(pxa27x_keypad_driver);
 837
 838 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
 839 MODULE_LICENSE("GPL");
 840 /* work with hotplug and coldplug */
 841 MODULE_ALIAS("platform:pxa27x-keypad");