drivers/input/keyboard/tc3589x-keypad.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * Author: Jayeeta Banerjee <jayeeta.banerjee@stericsson.com>
   5  * Author: Sundar Iyer <sundar.iyer@stericsson.com>
   6  *
   7  * License Terms: GNU General Public License, version 2
   8  *
   9  * TC35893 MFD Keypad Controller driver
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/input.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/input/matrix_keypad.h>
  17 #include <linux/i2c.h>
  18 #include <linux/slab.h>
  19 #include <linux/mfd/tc3589x.h>
  20
  21 /* Maximum supported keypad matrix row/columns size */
  22 #define TC3589x_MAX_KPROW               8
  23 #define TC3589x_MAX_KPCOL               12
  24
  25 /* keypad related Constants */
  26 #define TC3589x_MAX_DEBOUNCE_SETTLE     0xFF
  27 #define DEDICATED_KEY_VAL               0xFF
  28
  29 /* Pull up/down masks */
  30 #define TC3589x_NO_PULL_MASK            0x0
  31 #define TC3589x_PULL_DOWN_MASK          0x1
  32 #define TC3589x_PULL_UP_MASK            0x2
  33 #define TC3589x_PULLUP_ALL_MASK         0xAA
  34 #define TC3589x_IO_PULL_VAL(index, mask)        ((mask)<<((index)%4)*2))
  35
  36 /* Bit masks for IOCFG register */
  37 #define IOCFG_BALLCFG           0x01
  38 #define IOCFG_IG                0x08
  39
  40 #define KP_EVCODE_COL_MASK      0x0F
  41 #define KP_EVCODE_ROW_MASK      0x70
  42 #define KP_RELEASE_EVT_MASK     0x80
  43
  44 #define KP_ROW_SHIFT            4
  45
  46 #define KP_NO_VALID_KEY_MASK    0x7F
  47
  48 /* bit masks for RESTCTRL register */
  49 #define TC3589x_KBDRST          0x2
  50 #define TC3589x_IRQRST          0x10
  51 #define TC3589x_RESET_ALL       0x1B
  52
  53 /* KBDMFS register bit mask */
  54 #define TC3589x_KBDMFS_EN       0x1
  55
  56 /* CLKEN register bitmask */
  57 #define KPD_CLK_EN              0x1
  58
  59 /* RSTINTCLR register bit mask */
  60 #define IRQ_CLEAR               0x1
  61
  62 /* bit masks for keyboard interrupts*/
  63 #define TC3589x_EVT_LOSS_INT    0x8
  64 #define TC3589x_EVT_INT         0x4
  65 #define TC3589x_KBD_LOSS_INT    0x2
  66 #define TC3589x_KBD_INT         0x1
  67
  68 /* bit masks for keyboard interrupt clear*/
  69 #define TC3589x_EVT_INT_CLR     0x2
  70 #define TC3589x_KBD_INT_CLR     0x1
  71
  72 /**
  73  * struct tc_keypad - data structure used by keypad driver
  74  * @tc3589x:    pointer to tc35893
  75  * @input:      pointer to input device object
  76  * @board:      keypad platform device
  77  * @krow:       number of rows
  78  * @kcol:       number of columns
  79  * @keymap:     matrix scan code table for keycodes
  80  * @keypad_stopped: holds keypad status
  81  */
  82 struct tc_keypad {
  83         struct tc3589x *tc3589x;
  84         struct input_dev *input;
  85         const struct tc3589x_keypad_platform_data *board;
  86         unsigned int krow;
  87         unsigned int kcol;
  88         unsigned short *keymap;
  89         bool keypad_stopped;
  90 };
  91
  92 static int tc3589x_keypad_init_key_hardware(struct tc_keypad *keypad)
  93 {
  94         int ret;
  95         struct tc3589x *tc3589x = keypad->tc3589x;
  96         const struct tc3589x_keypad_platform_data *board = keypad->board;
  97
  98         /* validate platform configuration */
  99         if (board->kcol > TC3589x_MAX_KPCOL || board->krow > TC3589x_MAX_KPROW)
 100                 return -EINVAL;
 101
 102         /* configure KBDSIZE 4 LSbits for cols and 4 MSbits for rows */
 103         ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSIZE,
 104                         (board->krow << KP_ROW_SHIFT) | board->kcol);
 105         if (ret < 0)
 106                 return ret;
 107
 108         /* configure dedicated key config, no dedicated key selected */
 109         ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_LSB, DEDICATED_KEY_VAL);
 110         if (ret < 0)
 111                 return ret;
 112
 113         ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_MSB, DEDICATED_KEY_VAL);
 114         if (ret < 0)
 115                 return ret;
 116
 117         /* Configure settle time */
 118         ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSETTLE_REG,
 119                                 board->settle_time);
 120         if (ret < 0)
 121                 return ret;
 122
 123         /* Configure debounce time */
 124         ret = tc3589x_reg_write(tc3589x, TC3589x_KBDBOUNCE,
 125                                 board->debounce_period);
 126         if (ret < 0)
 127                 return ret;
 128
 129         /* Start of initialise keypad GPIOs */
 130         ret = tc3589x_set_bits(tc3589x, TC3589x_IOCFG, 0x0, IOCFG_IG);
 131         if (ret < 0)
 132                 return ret;
 133
 134         /* Configure pull-up resistors for all row GPIOs */
 135         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_LSB,
 136                                         TC3589x_PULLUP_ALL_MASK);
 137         if (ret < 0)
 138                 return ret;
 139
 140         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_MSB,
 141                                         TC3589x_PULLUP_ALL_MASK);
 142         if (ret < 0)
 143                 return ret;
 144
 145         /* Configure pull-up resistors for all column GPIOs */
 146         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_LSB,
 147                         TC3589x_PULLUP_ALL_MASK);
 148         if (ret < 0)
 149                 return ret;
 150
 151         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_MSB,
 152                         TC3589x_PULLUP_ALL_MASK);
 153         if (ret < 0)
 154                 return ret;
 155
 156         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG2_LSB,
 157                         TC3589x_PULLUP_ALL_MASK);
 158
 159         return ret;
 160 }
 161
 162 #define TC35893_DATA_REGS               4
 163 #define TC35893_KEYCODE_FIFO_EMPTY      0x7f
 164 #define TC35893_KEYCODE_FIFO_CLEAR      0xff
 165 #define TC35893_KEYPAD_ROW_SHIFT        0x3
 166
 167 static irqreturn_t tc3589x_keypad_irq(int irq, void *dev)
 168 {
 169         struct tc_keypad *keypad = dev;
 170         struct tc3589x *tc3589x = keypad->tc3589x;
 171         u8 i, row_index, col_index, kbd_code, up;
 172         u8 code;
 173
 174         for (i = 0; i < TC35893_DATA_REGS * 2; i++) {
 175                 kbd_code = tc3589x_reg_read(tc3589x, TC3589x_EVTCODE_FIFO);
 176
 177                 /* loop till fifo is empty and no more keys are pressed */
 178                 if (kbd_code == TC35893_KEYCODE_FIFO_EMPTY ||
 179                                 kbd_code == TC35893_KEYCODE_FIFO_CLEAR)
 180                         continue;
 181
 182                 /* valid key is found */
 183                 col_index = kbd_code & KP_EVCODE_COL_MASK;
 184                 row_index = (kbd_code & KP_EVCODE_ROW_MASK) >> KP_ROW_SHIFT;
 185                 code = MATRIX_SCAN_CODE(row_index, col_index,
 186                                                 TC35893_KEYPAD_ROW_SHIFT);
 187                 up = kbd_code & KP_RELEASE_EVT_MASK;
 188
 189                 input_event(keypad->input, EV_MSC, MSC_SCAN, code);
 190                 input_report_key(keypad->input, keypad->keymap[code], !up);
 191                 input_sync(keypad->input);
 192         }
 193
 194         /* clear IRQ */
 195         tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
 196                         0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
 197         /* enable IRQ */
 198         tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
 199                         0x0, TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 static int tc3589x_keypad_enable(struct tc_keypad *keypad)
 205 {
 206         struct tc3589x *tc3589x = keypad->tc3589x;
 207         int ret;
 208
 209         /* pull the keypad module out of reset */
 210         ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x0);
 211         if (ret < 0)
 212                 return ret;
 213
 214         /* configure KBDMFS */
 215         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMFS, 0x0, TC3589x_KBDMFS_EN);
 216         if (ret < 0)
 217                 return ret;
 218
 219         /* enable the keypad clock */
 220         ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x0, KPD_CLK_EN);
 221         if (ret < 0)
 222                 return ret;
 223
 224         /* clear pending IRQs */
 225         ret =  tc3589x_set_bits(tc3589x, TC3589x_RSTINTCLR, 0x0, 0x1);
 226         if (ret < 0)
 227                 return ret;
 228
 229         /* enable the IRQs */
 230         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK, 0x0,
 231                                         TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
 232         if (ret < 0)
 233                 return ret;
 234
 235         keypad->keypad_stopped = false;
 236
 237         return ret;
 238 }
 239
 240 static int tc3589x_keypad_disable(struct tc_keypad *keypad)
 241 {
 242         struct tc3589x *tc3589x = keypad->tc3589x;
 243         int ret;
 244
 245         /* clear IRQ */
 246         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
 247                         0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
 248         if (ret < 0)
 249                 return ret;
 250
 251         /* disable all interrupts */
 252         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
 253                         ~(TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT), 0x0);
 254         if (ret < 0)
 255                 return ret;
 256
 257         /* disable the keypad module */
 258         ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x1, 0x0);
 259         if (ret < 0)
 260                 return ret;
 261
 262         /* put the keypad module into reset */
 263         ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x1);
 264
 265         keypad->keypad_stopped = true;
 266
 267         return ret;
 268 }
 269
 270 static int tc3589x_keypad_open(struct input_dev *input)
 271 {
 272         int error;
 273         struct tc_keypad *keypad = input_get_drvdata(input);
 274
 275         /* enable the keypad module */
 276         error = tc3589x_keypad_enable(keypad);
 277         if (error < 0) {
 278                 dev_err(&input->dev, "failed to enable keypad module\n");
 279                 return error;
 280         }
 281
 282         error = tc3589x_keypad_init_key_hardware(keypad);
 283         if (error < 0) {
 284                 dev_err(&input->dev, "failed to configure keypad module\n");
 285                 return error;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static void tc3589x_keypad_close(struct input_dev *input)
 292 {
 293         struct tc_keypad *keypad = input_get_drvdata(input);
 294
 295         /* disable the keypad module */
 296         tc3589x_keypad_disable(keypad);
 297 }
 298
 299 static int tc3589x_keypad_probe(struct platform_device *pdev)
 300 {
 301         struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
 302         struct tc_keypad *keypad;
 303         struct input_dev *input;
 304         const struct tc3589x_keypad_platform_data *plat;
 305         int error, irq;
 306
 307         plat = tc3589x->pdata->keypad;
 308         if (!plat) {
 309                 dev_err(&pdev->dev, "invalid keypad platform data\n");
 310                 return -EINVAL;
 311         }
 312
 313         irq = platform_get_irq(pdev, 0);
 314         if (irq < 0)
 315                 return irq;
 316
 317         keypad = kzalloc(sizeof(struct tc_keypad), GFP_KERNEL);
 318         input = input_allocate_device();
 319         if (!keypad || !input) {
 320                 dev_err(&pdev->dev, "failed to allocate keypad memory\n");
 321                 error = -ENOMEM;
 322                 goto err_free_mem;
 323         }
 324
 325         keypad->board = plat;
 326         keypad->input = input;
 327         keypad->tc3589x = tc3589x;
 328
 329         input->id.bustype = BUS_I2C;
 330         input->name = pdev->name;
 331         input->dev.parent = &pdev->dev;
 332
 333         input->open = tc3589x_keypad_open;
 334         input->close = tc3589x_keypad_close;
 335
 336         error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
 337                                            TC3589x_MAX_KPROW, TC3589x_MAX_KPCOL,
 338                                            NULL, input);
 339         if (error) {
 340                 dev_err(&pdev->dev, "Failed to build keymap\n");
 341                 goto err_free_mem;
 342         }
 343
 344         keypad->keymap = input->keycode;
 345
 346         input_set_capability(input, EV_MSC, MSC_SCAN);
 347         if (!plat->no_autorepeat)
 348                 __set_bit(EV_REP, input->evbit);
 349
 350         input_set_drvdata(input, keypad);
 351
 352         error = request_threaded_irq(irq, NULL,
 353                         tc3589x_keypad_irq, plat->irqtype,
 354                         "tc3589x-keypad", keypad);
 355         if (error < 0) {
 356                 dev_err(&pdev->dev,
 357                                 "Could not allocate irq %d,error %d\n",
 358                                 irq, error);
 359                 goto err_free_mem;
 360         }
 361
 362         error = input_register_device(input);
 363         if (error) {
 364                 dev_err(&pdev->dev, "Could not register input device\n");
 365                 goto err_free_irq;
 366         }
 367
 368         /* let platform decide if keypad is a wakeup source or not */
 369         device_init_wakeup(&pdev->dev, plat->enable_wakeup);
 370         device_set_wakeup_capable(&pdev->dev, plat->enable_wakeup);
 371
 372         platform_set_drvdata(pdev, keypad);
 373
 374         return 0;
 375
 376 err_free_irq:
 377         free_irq(irq, keypad);
 378 err_free_mem:
 379         input_free_device(input);
 380         kfree(keypad);
 381         return error;
 382 }
 383
 384 static int tc3589x_keypad_remove(struct platform_device *pdev)
 385 {
 386         struct tc_keypad *keypad = platform_get_drvdata(pdev);
 387         int irq = platform_get_irq(pdev, 0);
 388
 389         if (!keypad->keypad_stopped)
 390                 tc3589x_keypad_disable(keypad);
 391
 392         free_irq(irq, keypad);
 393
 394         input_unregister_device(keypad->input);
 395
 396         kfree(keypad);
 397
 398         return 0;
 399 }
 400
 401 #ifdef CONFIG_PM_SLEEP
 402 static int tc3589x_keypad_suspend(struct device *dev)
 403 {
 404         struct platform_device *pdev = to_platform_device(dev);
 405         struct tc_keypad *keypad = platform_get_drvdata(pdev);
 406         int irq = platform_get_irq(pdev, 0);
 407
 408         /* keypad is already off; we do nothing */
 409         if (keypad->keypad_stopped)
 410                 return 0;
 411
 412         /* if device is not a wakeup source, disable it for powersave */
 413         if (!device_may_wakeup(&pdev->dev))
 414                 tc3589x_keypad_disable(keypad);
 415         else
 416                 enable_irq_wake(irq);
 417
 418         return 0;
 419 }
 420
 421 static int tc3589x_keypad_resume(struct device *dev)
 422 {
 423         struct platform_device *pdev = to_platform_device(dev);
 424         struct tc_keypad *keypad = platform_get_drvdata(pdev);
 425         int irq = platform_get_irq(pdev, 0);
 426
 427         if (!keypad->keypad_stopped)
 428                 return 0;
 429
 430         /* enable the device to resume normal operations */
 431         if (!device_may_wakeup(&pdev->dev))
 432                 tc3589x_keypad_enable(keypad);
 433         else
 434                 disable_irq_wake(irq);
 435
 436         return 0;
 437 }
 438 #endif
 439
 440 static SIMPLE_DEV_PM_OPS(tc3589x_keypad_dev_pm_ops,
 441                          tc3589x_keypad_suspend, tc3589x_keypad_resume);
 442
 443 static struct platform_driver tc3589x_keypad_driver = {
 444         .driver = {
 445                 .name   = "tc3589x-keypad",
 446                 .owner  = THIS_MODULE,
 447                 .pm     = &tc3589x_keypad_dev_pm_ops,
 448         },
 449         .probe  = tc3589x_keypad_probe,
 450         .remove = tc3589x_keypad_remove,
 451 };
 452 module_platform_driver(tc3589x_keypad_driver);
 453
 454 MODULE_LICENSE("GPL v2");
 455 MODULE_AUTHOR("Jayeeta Banerjee/Sundar Iyer");
 456 MODULE_DESCRIPTION("TC35893 Keypad Driver");
 457 MODULE_ALIAS("platform:tc3589x-keypad");