drivers/input/keyboard/pmic8xxx-keypad.c

   1 /* Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   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
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/kernel.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/slab.h>
  18 #include <linux/input.h>
  19 #include <linux/bitops.h>
  20 #include <linux/delay.h>
  21 #include <linux/mutex.h>
  22
  23 #include <linux/mfd/pm8xxx/core.h>
  24 #include <linux/mfd/pm8xxx/gpio.h>
  25 #include <linux/input/pmic8xxx-keypad.h>
  26
  27 #define PM8XXX_MAX_ROWS         18
  28 #define PM8XXX_MAX_COLS         8
  29 #define PM8XXX_ROW_SHIFT        3
  30 #define PM8XXX_MATRIX_MAX_SIZE  (PM8XXX_MAX_ROWS * PM8XXX_MAX_COLS)
  31
  32 #define PM8XXX_MIN_ROWS         5
  33 #define PM8XXX_MIN_COLS         5
  34
  35 #define MAX_SCAN_DELAY          128
  36 #define MIN_SCAN_DELAY          1
  37
  38 /* in nanoseconds */
  39 #define MAX_ROW_HOLD_DELAY      122000
  40 #define MIN_ROW_HOLD_DELAY      30500
  41
  42 #define MAX_DEBOUNCE_TIME       20
  43 #define MIN_DEBOUNCE_TIME       5
  44
  45 #define KEYP_CTRL                       0x148
  46
  47 #define KEYP_CTRL_EVNTS                 BIT(0)
  48 #define KEYP_CTRL_EVNTS_MASK            0x3
  49
  50 #define KEYP_CTRL_SCAN_COLS_SHIFT       5
  51 #define KEYP_CTRL_SCAN_COLS_MIN         5
  52 #define KEYP_CTRL_SCAN_COLS_BITS        0x3
  53
  54 #define KEYP_CTRL_SCAN_ROWS_SHIFT       2
  55 #define KEYP_CTRL_SCAN_ROWS_MIN         5
  56 #define KEYP_CTRL_SCAN_ROWS_BITS        0x7
  57
  58 #define KEYP_CTRL_KEYP_EN               BIT(7)
  59
  60 #define KEYP_SCAN                       0x149
  61
  62 #define KEYP_SCAN_READ_STATE            BIT(0)
  63 #define KEYP_SCAN_DBOUNCE_SHIFT         1
  64 #define KEYP_SCAN_PAUSE_SHIFT           3
  65 #define KEYP_SCAN_ROW_HOLD_SHIFT        6
  66
  67 #define KEYP_TEST                       0x14A
  68
  69 #define KEYP_TEST_CLEAR_RECENT_SCAN     BIT(6)
  70 #define KEYP_TEST_CLEAR_OLD_SCAN        BIT(5)
  71 #define KEYP_TEST_READ_RESET            BIT(4)
  72 #define KEYP_TEST_DTEST_EN              BIT(3)
  73 #define KEYP_TEST_ABORT_READ            BIT(0)
  74
  75 #define KEYP_TEST_DBG_SELECT_SHIFT      1
  76
  77 /* bits of these registers represent
  78  * '0' for key press
  79  * '1' for key release
  80  */
  81 #define KEYP_RECENT_DATA                0x14B
  82 #define KEYP_OLD_DATA                   0x14C
  83
  84 #define KEYP_CLOCK_FREQ                 32768
  85
  86 /**
  87  * struct pmic8xxx_kp - internal keypad data structure
  88  * @pdata - keypad platform data pointer
  89  * @input - input device pointer for keypad
  90  * @key_sense_irq - key press/release irq number
  91  * @key_stuck_irq - key stuck notification irq number
  92  * @keycodes - array to hold the key codes
  93  * @dev - parent device pointer
  94  * @keystate - present key press/release state
  95  * @stuckstate - present state when key stuck irq
  96  * @ctrl_reg - control register value
  97  */
  98 struct pmic8xxx_kp {
  99         const struct pm8xxx_keypad_platform_data *pdata;
 100         struct input_dev *input;
 101         int key_sense_irq;
 102         int key_stuck_irq;
 103
 104         unsigned short keycodes[PM8XXX_MATRIX_MAX_SIZE];
 105
 106         struct device *dev;
 107         u16 keystate[PM8XXX_MAX_ROWS];
 108         u16 stuckstate[PM8XXX_MAX_ROWS];
 109
 110         u8 ctrl_reg;
 111 };
 112
 113 static int pmic8xxx_kp_write_u8(struct pmic8xxx_kp *kp,
 114                                  u8 data, u16 reg)
 115 {
 116         int rc;
 117
 118         rc = pm8xxx_writeb(kp->dev->parent, reg, data);
 119         return rc;
 120 }
 121
 122 static int pmic8xxx_kp_read(struct pmic8xxx_kp *kp,
 123                                  u8 *data, u16 reg, unsigned num_bytes)
 124 {
 125         int rc;
 126
 127         rc = pm8xxx_read_buf(kp->dev->parent, reg, data, num_bytes);
 128         return rc;
 129 }
 130
 131 static int pmic8xxx_kp_read_u8(struct pmic8xxx_kp *kp,
 132                                  u8 *data, u16 reg)
 133 {
 134         int rc;
 135
 136         rc = pmic8xxx_kp_read(kp, data, reg, 1);
 137         return rc;
 138 }
 139
 140 static u8 pmic8xxx_col_state(struct pmic8xxx_kp *kp, u8 col)
 141 {
 142         /* all keys pressed on that particular row? */
 143         if (col == 0x00)
 144                 return 1 << kp->pdata->num_cols;
 145         else
 146                 return col & ((1 << kp->pdata->num_cols) - 1);
 147 }
 148
 149 /*
 150  * Synchronous read protocol for RevB0 onwards:
 151  *
 152  * 1. Write '1' to ReadState bit in KEYP_SCAN register
 153  * 2. Wait 2*32KHz clocks, so that HW can successfully enter read mode
 154  *    synchronously
 155  * 3. Read rows in old array first if events are more than one
 156  * 4. Read rows in recent array
 157  * 5. Wait 4*32KHz clocks
 158  * 6. Write '0' to ReadState bit of KEYP_SCAN register so that hw can
 159  *    synchronously exit read mode.
 160  */
 161 static int pmic8xxx_chk_sync_read(struct pmic8xxx_kp *kp)
 162 {
 163         int rc;
 164         u8 scan_val;
 165
 166         rc = pmic8xxx_kp_read_u8(kp, &scan_val, KEYP_SCAN);
 167         if (rc < 0) {
 168                 dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
 169                 return rc;
 170         }
 171
 172         scan_val |= 0x1;
 173
 174         rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
 175         if (rc < 0) {
 176                 dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
 177                 return rc;
 178         }
 179
 180         /* 2 * 32KHz clocks */
 181         udelay((2 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);
 182
 183         return rc;
 184 }
 185
 186 static int pmic8xxx_kp_read_data(struct pmic8xxx_kp *kp, u16 *state,
 187                                         u16 data_reg, int read_rows)
 188 {
 189         int rc, row;
 190         u8 new_data[PM8XXX_MAX_ROWS];
 191
 192         rc = pmic8xxx_kp_read(kp, new_data, data_reg, read_rows);
 193         if (rc)
 194                 return rc;
 195
 196         for (row = 0; row < kp->pdata->num_rows; row++) {
 197                 dev_dbg(kp->dev, "new_data[%d] = %d\n", row,
 198                                         new_data[row]);
 199                 state[row] = pmic8xxx_col_state(kp, new_data[row]);
 200         }
 201
 202         return rc;
 203 }
 204
 205 static int pmic8xxx_kp_read_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
 206                                          u16 *old_state)
 207 {
 208         int rc, read_rows;
 209         u8 scan_val;
 210
 211         if (kp->pdata->num_rows < PM8XXX_MIN_ROWS)
 212                 read_rows = PM8XXX_MIN_ROWS;
 213         else
 214                 read_rows = kp->pdata->num_rows;
 215
 216         pmic8xxx_chk_sync_read(kp);
 217
 218         if (old_state) {
 219                 rc = pmic8xxx_kp_read_data(kp, old_state, KEYP_OLD_DATA,
 220                                                 read_rows);
 221                 if (rc < 0) {
 222                         dev_err(kp->dev,
 223                                 "Error reading KEYP_OLD_DATA, rc=%d\n", rc);
 224                         return rc;
 225                 }
 226         }
 227
 228         rc = pmic8xxx_kp_read_data(kp, new_state, KEYP_RECENT_DATA,
 229                                          read_rows);
 230         if (rc < 0) {
 231                 dev_err(kp->dev,
 232                         "Error reading KEYP_RECENT_DATA, rc=%d\n", rc);
 233                 return rc;
 234         }
 235
 236         /* 4 * 32KHz clocks */
 237         udelay((4 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);
 238
 239         rc = pmic8xxx_kp_read_u8(kp, &scan_val, KEYP_SCAN);
 240         if (rc < 0) {
 241                 dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
 242                 return rc;
 243         }
 244
 245         scan_val &= 0xFE;
 246         rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
 247         if (rc < 0)
 248                 dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
 249
 250         return rc;
 251 }
 252
 253 static void __pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
 254                                          u16 *old_state)
 255 {
 256         int row, col, code;
 257
 258         for (row = 0; row < kp->pdata->num_rows; row++) {
 259                 int bits_changed = new_state[row] ^ old_state[row];
 260
 261                 if (!bits_changed)
 262                         continue;
 263
 264                 for (col = 0; col < kp->pdata->num_cols; col++) {
 265                         if (!(bits_changed & (1 << col)))
 266                                 continue;
 267
 268                         dev_dbg(kp->dev, "key [%d:%d] %s\n", row, col,
 269                                         !(new_state[row] & (1 << col)) ?
 270                                         "pressed" : "released");
 271
 272                         code = MATRIX_SCAN_CODE(row, col, PM8XXX_ROW_SHIFT);
 273
 274                         input_event(kp->input, EV_MSC, MSC_SCAN, code);
 275                         input_report_key(kp->input,
 276                                         kp->keycodes[code],
 277                                         !(new_state[row] & (1 << col)));
 278
 279                         input_sync(kp->input);
 280                 }
 281         }
 282 }
 283
 284 static bool pmic8xxx_detect_ghost_keys(struct pmic8xxx_kp *kp, u16 *new_state)
 285 {
 286         int row, found_first = -1;
 287         u16 check, row_state;
 288
 289         check = 0;
 290         for (row = 0; row < kp->pdata->num_rows; row++) {
 291                 row_state = (~new_state[row]) &
 292                                  ((1 << kp->pdata->num_cols) - 1);
 293
 294                 if (hweight16(row_state) > 1) {
 295                         if (found_first == -1)
 296                                 found_first = row;
 297                         if (check & row_state) {
 298                                 dev_dbg(kp->dev, "detected ghost key on row[%d]"
 299                                          " and row[%d]\n", found_first, row);
 300                                 return true;
 301                         }
 302                 }
 303                 check |= row_state;
 304         }
 305         return false;
 306 }
 307
 308 static int pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, unsigned int events)
 309 {
 310         u16 new_state[PM8XXX_MAX_ROWS];
 311         u16 old_state[PM8XXX_MAX_ROWS];
 312         int rc;
 313
 314         switch (events) {
 315         case 0x1:
 316                 rc = pmic8xxx_kp_read_matrix(kp, new_state, NULL);
 317                 if (rc < 0)
 318                         return rc;
 319
 320                 /* detecting ghost key is not an error */
 321                 if (pmic8xxx_detect_ghost_keys(kp, new_state))
 322                         return 0;
 323                 __pmic8xxx_kp_scan_matrix(kp, new_state, kp->keystate);
 324                 memcpy(kp->keystate, new_state, sizeof(new_state));
 325         break;
 326         case 0x3: /* two events - eventcounter is gray-coded */
 327                 rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
 328                 if (rc < 0)
 329                         return rc;
 330
 331                 __pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate);
 332                 __pmic8xxx_kp_scan_matrix(kp, new_state, old_state);
 333                 memcpy(kp->keystate, new_state, sizeof(new_state));
 334         break;
 335         case 0x2:
 336                 dev_dbg(kp->dev, "Some key events were lost\n");
 337                 rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
 338                 if (rc < 0)
 339                         return rc;
 340                 __pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate);
 341                 __pmic8xxx_kp_scan_matrix(kp, new_state, old_state);
 342                 memcpy(kp->keystate, new_state, sizeof(new_state));
 343         break;
 344         default:
 345                 rc = -EINVAL;
 346         }
 347         return rc;
 348 }
 349
 350 /*
 351  * NOTE: We are reading recent and old data registers blindly
 352  * whenever key-stuck interrupt happens, because events counter doesn't
 353  * get updated when this interrupt happens due to key stuck doesn't get
 354  * considered as key state change.
 355  *
 356  * We are not using old data register contents after they are being read
 357  * because it might report the key which was pressed before the key being stuck
 358  * as stuck key because it's pressed status is stored in the old data
 359  * register.
 360  */
 361 static irqreturn_t pmic8xxx_kp_stuck_irq(int irq, void *data)
 362 {
 363         u16 new_state[PM8XXX_MAX_ROWS];
 364         u16 old_state[PM8XXX_MAX_ROWS];
 365         int rc;
 366         struct pmic8xxx_kp *kp = data;
 367
 368         rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
 369         if (rc < 0) {
 370                 dev_err(kp->dev, "failed to read keypad matrix\n");
 371                 return IRQ_HANDLED;
 372         }
 373
 374         __pmic8xxx_kp_scan_matrix(kp, new_state, kp->stuckstate);
 375
 376         return IRQ_HANDLED;
 377 }
 378
 379 static irqreturn_t pmic8xxx_kp_irq(int irq, void *data)
 380 {
 381         struct pmic8xxx_kp *kp = data;
 382         u8 ctrl_val, events;
 383         int rc;
 384
 385         rc = pmic8xxx_kp_read(kp, &ctrl_val, KEYP_CTRL, 1);
 386         if (rc < 0) {
 387                 dev_err(kp->dev, "failed to read keyp_ctrl register\n");
 388                 return IRQ_HANDLED;
 389         }
 390
 391         events = ctrl_val & KEYP_CTRL_EVNTS_MASK;
 392
 393         rc = pmic8xxx_kp_scan_matrix(kp, events);
 394         if (rc < 0)
 395                 dev_err(kp->dev, "failed to scan matrix\n");
 396
 397         return IRQ_HANDLED;
 398 }
 399
 400 static int __devinit pmic8xxx_kpd_init(struct pmic8xxx_kp *kp)
 401 {
 402         int bits, rc, cycles;
 403         u8 scan_val = 0, ctrl_val = 0;
 404         static const u8 row_bits[] = {
 405                 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7,
 406         };
 407
 408         /* Find column bits */
 409         if (kp->pdata->num_cols < KEYP_CTRL_SCAN_COLS_MIN)
 410                 bits = 0;
 411         else
 412                 bits = kp->pdata->num_cols - KEYP_CTRL_SCAN_COLS_MIN;
 413         ctrl_val = (bits & KEYP_CTRL_SCAN_COLS_BITS) <<
 414                 KEYP_CTRL_SCAN_COLS_SHIFT;
 415
 416         /* Find row bits */
 417         if (kp->pdata->num_rows < KEYP_CTRL_SCAN_ROWS_MIN)
 418                 bits = 0;
 419         else
 420                 bits = row_bits[kp->pdata->num_rows - KEYP_CTRL_SCAN_ROWS_MIN];
 421
 422         ctrl_val |= (bits << KEYP_CTRL_SCAN_ROWS_SHIFT);
 423
 424         rc = pmic8xxx_kp_write_u8(kp, ctrl_val, KEYP_CTRL);
 425         if (rc < 0) {
 426                 dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
 427                 return rc;
 428         }
 429
 430         bits = (kp->pdata->debounce_ms / 5) - 1;
 431
 432         scan_val |= (bits << KEYP_SCAN_DBOUNCE_SHIFT);
 433
 434         bits = fls(kp->pdata->scan_delay_ms) - 1;
 435         scan_val |= (bits << KEYP_SCAN_PAUSE_SHIFT);
 436
 437         /* Row hold time is a multiple of 32KHz cycles. */
 438         cycles = (kp->pdata->row_hold_ns * KEYP_CLOCK_FREQ) / NSEC_PER_SEC;
 439
 440         scan_val |= (cycles << KEYP_SCAN_ROW_HOLD_SHIFT);
 441
 442         rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
 443         if (rc)
 444                 dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
 445
 446         return rc;
 447
 448 }
 449
 450 static int  __devinit pmic8xxx_kp_config_gpio(int gpio_start, int num_gpios,
 451                         struct pmic8xxx_kp *kp, struct pm_gpio *gpio_config)
 452 {
 453         int     rc, i;
 454
 455         if (gpio_start < 0 || num_gpios < 0)
 456                 return -EINVAL;
 457
 458         for (i = 0; i < num_gpios; i++) {
 459                 rc = pm8xxx_gpio_config(gpio_start + i, gpio_config);
 460                 if (rc) {
 461                         dev_err(kp->dev, "%s: FAIL pm8xxx_gpio_config():"
 462                                         "for PM GPIO [%d] rc=%d.\n",
 463                                         __func__, gpio_start + i, rc);
 464                         return rc;
 465                 }
 466          }
 467
 468         return 0;
 469 }
 470
 471 static int pmic8xxx_kp_enable(struct pmic8xxx_kp *kp)
 472 {
 473         int rc;
 474
 475         kp->ctrl_reg |= KEYP_CTRL_KEYP_EN;
 476
 477         rc = pmic8xxx_kp_write_u8(kp, kp->ctrl_reg, KEYP_CTRL);
 478         if (rc < 0)
 479                 dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
 480
 481         return rc;
 482 }
 483
 484 static int pmic8xxx_kp_disable(struct pmic8xxx_kp *kp)
 485 {
 486         int rc;
 487
 488         kp->ctrl_reg &= ~KEYP_CTRL_KEYP_EN;
 489
 490         rc = pmic8xxx_kp_write_u8(kp, kp->ctrl_reg, KEYP_CTRL);
 491         if (rc < 0)
 492                 return rc;
 493
 494         return rc;
 495 }
 496
 497 static int pmic8xxx_kp_open(struct input_dev *dev)
 498 {
 499         struct pmic8xxx_kp *kp = input_get_drvdata(dev);
 500
 501         return pmic8xxx_kp_enable(kp);
 502 }
 503
 504 static void pmic8xxx_kp_close(struct input_dev *dev)
 505 {
 506         struct pmic8xxx_kp *kp = input_get_drvdata(dev);
 507
 508         pmic8xxx_kp_disable(kp);
 509 }
 510
 511 /*
 512  * keypad controller should be initialized in the following sequence
 513  * only, otherwise it might get into FSM stuck state.
 514  *
 515  * - Initialize keypad control parameters, like no. of rows, columns,
 516  *   timing values etc.,
 517  * - configure rows and column gpios pull up/down.
 518  * - set irq edge type.
 519  * - enable the keypad controller.
 520  */
 521 static int __devinit pmic8xxx_kp_probe(struct platform_device *pdev)
 522 {
 523         const struct pm8xxx_keypad_platform_data *pdata =
 524                                         dev_get_platdata(&pdev->dev);
 525         const struct matrix_keymap_data *keymap_data;
 526         struct pmic8xxx_kp *kp;
 527         int rc;
 528         u8 ctrl_val;
 529
 530         struct pm_gpio kypd_drv = {
 531                 .direction      = PM_GPIO_DIR_OUT,
 532                 .output_buffer  = PM_GPIO_OUT_BUF_OPEN_DRAIN,
 533                 .output_value   = 0,
 534                 .pull           = PM_GPIO_PULL_NO,
 535                 .vin_sel        = PM_GPIO_VIN_S3,
 536                 .out_strength   = PM_GPIO_STRENGTH_LOW,
 537                 .function       = PM_GPIO_FUNC_1,
 538                 .inv_int_pol    = 1,
 539         };
 540
 541         struct pm_gpio kypd_sns = {
 542                 .direction      = PM_GPIO_DIR_IN,
 543                 .pull           = PM_GPIO_PULL_UP_31P5,
 544                 .vin_sel        = PM_GPIO_VIN_S3,
 545                 .out_strength   = PM_GPIO_STRENGTH_NO,
 546                 .function       = PM_GPIO_FUNC_NORMAL,
 547                 .inv_int_pol    = 1,
 548         };
 549
 550
 551         if (!pdata || !pdata->num_cols || !pdata->num_rows ||
 552                 pdata->num_cols > PM8XXX_MAX_COLS ||
 553                 pdata->num_rows > PM8XXX_MAX_ROWS ||
 554                 pdata->num_cols < PM8XXX_MIN_COLS) {
 555                 dev_err(&pdev->dev, "invalid platform data\n");
 556                 return -EINVAL;
 557         }
 558
 559         if (!pdata->scan_delay_ms ||
 560                 pdata->scan_delay_ms > MAX_SCAN_DELAY ||
 561                 pdata->scan_delay_ms < MIN_SCAN_DELAY ||
 562                 !is_power_of_2(pdata->scan_delay_ms)) {
 563                 dev_err(&pdev->dev, "invalid keypad scan time supplied\n");
 564                 return -EINVAL;
 565         }
 566
 567         if (!pdata->row_hold_ns ||
 568                 pdata->row_hold_ns > MAX_ROW_HOLD_DELAY ||
 569                 pdata->row_hold_ns < MIN_ROW_HOLD_DELAY ||
 570                 ((pdata->row_hold_ns % MIN_ROW_HOLD_DELAY) != 0)) {
 571                 dev_err(&pdev->dev, "invalid keypad row hold time supplied\n");
 572                 return -EINVAL;
 573         }
 574
 575         if (!pdata->debounce_ms ||
 576                 ((pdata->debounce_ms % 5) != 0) ||
 577                 pdata->debounce_ms > MAX_DEBOUNCE_TIME ||
 578                 pdata->debounce_ms < MIN_DEBOUNCE_TIME) {
 579                 dev_err(&pdev->dev, "invalid debounce time supplied\n");
 580                 return -EINVAL;
 581         }
 582
 583         keymap_data = pdata->keymap_data;
 584         if (!keymap_data) {
 585                 dev_err(&pdev->dev, "no keymap data supplied\n");
 586                 return -EINVAL;
 587         }
 588
 589         kp = kzalloc(sizeof(*kp), GFP_KERNEL);
 590         if (!kp)
 591                 return -ENOMEM;
 592
 593         platform_set_drvdata(pdev, kp);
 594
 595         kp->pdata       = pdata;
 596         kp->dev         = &pdev->dev;
 597
 598         kp->input = input_allocate_device();
 599         if (!kp->input) {
 600                 dev_err(&pdev->dev, "unable to allocate input device\n");
 601                 rc = -ENOMEM;
 602                 goto err_alloc_device;
 603         }
 604
 605         kp->key_sense_irq = platform_get_irq(pdev, 0);
 606         if (kp->key_sense_irq < 0) {
 607                 dev_err(&pdev->dev, "unable to get keypad sense irq\n");
 608                 rc = -ENXIO;
 609                 goto err_get_irq;
 610         }
 611
 612         kp->key_stuck_irq = platform_get_irq(pdev, 1);
 613         if (kp->key_stuck_irq < 0) {
 614                 dev_err(&pdev->dev, "unable to get keypad stuck irq\n");
 615                 rc = -ENXIO;
 616                 goto err_get_irq;
 617         }
 618
 619         kp->input->name = pdata->input_name ? : "PMIC8XXX keypad";
 620         kp->input->phys = pdata->input_phys_device ? : "pmic8xxx_keypad/input0";
 621
 622         kp->input->dev.parent   = &pdev->dev;
 623
 624         kp->input->id.bustype   = BUS_I2C;
 625         kp->input->id.version   = 0x0001;
 626         kp->input->id.product   = 0x0001;
 627         kp->input->id.vendor    = 0x0001;
 628
 629         kp->input->evbit[0]     = BIT_MASK(EV_KEY);
 630
 631         if (pdata->rep)
 632                 __set_bit(EV_REP, kp->input->evbit);
 633
 634         kp->input->keycode      = kp->keycodes;
 635         kp->input->keycodemax   = PM8XXX_MATRIX_MAX_SIZE;
 636         kp->input->keycodesize  = sizeof(kp->keycodes);
 637         kp->input->open         = pmic8xxx_kp_open;
 638         kp->input->close        = pmic8xxx_kp_close;
 639
 640         matrix_keypad_build_keymap(keymap_data, PM8XXX_ROW_SHIFT,
 641                                         kp->input->keycode, kp->input->keybit);
 642
 643         input_set_capability(kp->input, EV_MSC, MSC_SCAN);
 644         input_set_drvdata(kp->input, kp);
 645
 646         /* initialize keypad state */
 647         memset(kp->keystate, 0xff, sizeof(kp->keystate));
 648         memset(kp->stuckstate, 0xff, sizeof(kp->stuckstate));
 649
 650         rc = pmic8xxx_kpd_init(kp);
 651         if (rc < 0) {
 652                 dev_err(&pdev->dev, "unable to initialize keypad controller\n");
 653                 goto err_get_irq;
 654         }
 655
 656         rc = pmic8xxx_kp_config_gpio(pdata->cols_gpio_start,
 657                                         pdata->num_cols, kp, &kypd_sns);
 658         if (rc < 0) {
 659                 dev_err(&pdev->dev, "unable to configure keypad sense lines\n");
 660                 goto err_gpio_config;
 661         }
 662
 663         rc = pmic8xxx_kp_config_gpio(pdata->rows_gpio_start,
 664                                         pdata->num_rows, kp, &kypd_drv);
 665         if (rc < 0) {
 666                 dev_err(&pdev->dev, "unable to configure keypad drive lines\n");
 667                 goto err_gpio_config;
 668         }
 669
 670         rc = request_any_context_irq(kp->key_sense_irq, pmic8xxx_kp_irq,
 671                                  IRQF_TRIGGER_RISING, "pmic-keypad", kp);
 672         if (rc < 0) {
 673                 dev_err(&pdev->dev, "failed to request keypad sense irq\n");
 674                 goto err_get_irq;
 675         }
 676
 677         rc = request_any_context_irq(kp->key_stuck_irq, pmic8xxx_kp_stuck_irq,
 678                                  IRQF_TRIGGER_RISING, "pmic-keypad-stuck", kp);
 679         if (rc < 0) {
 680                 dev_err(&pdev->dev, "failed to request keypad stuck irq\n");
 681                 goto err_req_stuck_irq;
 682         }
 683
 684         rc = pmic8xxx_kp_read_u8(kp, &ctrl_val, KEYP_CTRL);
 685         if (rc < 0) {
 686                 dev_err(&pdev->dev, "failed to read KEYP_CTRL register\n");
 687                 goto err_pmic_reg_read;
 688         }
 689
 690         kp->ctrl_reg = ctrl_val;
 691
 692         rc = input_register_device(kp->input);
 693         if (rc < 0) {
 694                 dev_err(&pdev->dev, "unable to register keypad input device\n");
 695                 goto err_pmic_reg_read;
 696         }
 697
 698         device_init_wakeup(&pdev->dev, pdata->wakeup);
 699
 700         return 0;
 701
 702 err_pmic_reg_read:
 703         free_irq(kp->key_stuck_irq, NULL);
 704 err_req_stuck_irq:
 705         free_irq(kp->key_sense_irq, NULL);
 706 err_gpio_config:
 707 err_get_irq:
 708         input_free_device(kp->input);
 709 err_alloc_device:
 710         platform_set_drvdata(pdev, NULL);
 711         kfree(kp);
 712         return rc;
 713 }
 714
 715 static int __devexit pmic8xxx_kp_remove(struct platform_device *pdev)
 716 {
 717         struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
 718
 719         device_init_wakeup(&pdev->dev, 0);
 720         free_irq(kp->key_stuck_irq, NULL);
 721         free_irq(kp->key_sense_irq, NULL);
 722         input_unregister_device(kp->input);
 723         kfree(kp);
 724
 725         platform_set_drvdata(pdev, NULL);
 726         return 0;
 727 }
 728
 729 #ifdef CONFIG_PM_SLEEP
 730 static int pmic8xxx_kp_suspend(struct device *dev)
 731 {
 732         struct platform_device *pdev = to_platform_device(dev);
 733         struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
 734         struct input_dev *input_dev = kp->input;
 735
 736         if (device_may_wakeup(dev)) {
 737                 enable_irq_wake(kp->key_sense_irq);
 738         } else {
 739                 mutex_lock(&input_dev->mutex);
 740
 741                 if (input_dev->users)
 742                         pmic8xxx_kp_disable(kp);
 743
 744                 mutex_unlock(&input_dev->mutex);
 745         }
 746
 747         return 0;
 748 }
 749
 750 static int pmic8xxx_kp_resume(struct device *dev)
 751 {
 752         struct platform_device *pdev = to_platform_device(dev);
 753         struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
 754         struct input_dev *input_dev = kp->input;
 755
 756         if (device_may_wakeup(dev)) {
 757                 disable_irq_wake(kp->key_sense_irq);
 758         } else {
 759                 mutex_lock(&input_dev->mutex);
 760
 761                 if (input_dev->users)
 762                         pmic8xxx_kp_enable(kp);
 763
 764                 mutex_unlock(&input_dev->mutex);
 765         }
 766
 767         return 0;
 768 }
 769 #endif
 770
 771 static SIMPLE_DEV_PM_OPS(pm8xxx_kp_pm_ops,
 772                          pmic8xxx_kp_suspend, pmic8xxx_kp_resume);
 773
 774 static struct platform_driver pmic8xxx_kp_driver = {
 775         .probe          = pmic8xxx_kp_probe,
 776         .remove         = __devexit_p(pmic8xxx_kp_remove),
 777         .driver         = {
 778                 .name = PM8XXX_KEYPAD_DEV_NAME,
 779                 .owner = THIS_MODULE,
 780                 .pm = &pm8xxx_kp_pm_ops,
 781         },
 782 };
 783
 784 static int __init pmic8xxx_kp_init(void)
 785 {
 786         return platform_driver_register(&pmic8xxx_kp_driver);
 787 }
 788 module_init(pmic8xxx_kp_init);
 789
 790 static void __exit pmic8xxx_kp_exit(void)
 791 {
 792         platform_driver_unregister(&pmic8xxx_kp_driver);
 793 }
 794 module_exit(pmic8xxx_kp_exit);
 795
 796 MODULE_LICENSE("GPL v2");
 797 MODULE_DESCRIPTION("PMIC8XXX keypad driver");
 798 MODULE_VERSION("1.0");
 799 MODULE_ALIAS("platform:pmic8xxx_keypad");
 800 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");