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/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/input.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/input/matrix_keypad.h>
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20 #include <linux/mfd/tc3589x.h>
  21
  22 /* Maximum supported keypad matrix row/columns size */
  23 #define TC3589x_MAX_KPROW               8
  24 #define TC3589x_MAX_KPCOL               12
  25
  26 /* keypad related Constants */
  27 #define TC3589x_MAX_DEBOUNCE_SETTLE     0xFF
  28 #define DEDICATED_KEY_VAL               0xFF
  29
  30 /* Pull up/down masks */
  31 #define TC3589x_NO_PULL_MASK            0x0
  32 #define TC3589x_PULL_DOWN_MASK          0x1
  33 #define TC3589x_PULL_UP_MASK            0x2
  34 #define TC3589x_PULLUP_ALL_MASK         0xAA
  35 #define TC3589x_IO_PULL_VAL(index, mask)        ((mask)<<((index)%4)*2))
  36
  37 /* Bit masks for IOCFG register */
  38 #define IOCFG_BALLCFG           0x01
  39 #define IOCFG_IG                0x08
  40
  41 #define KP_EVCODE_COL_MASK      0x0F
  42 #define KP_EVCODE_ROW_MASK      0x70
  43 #define KP_RELEASE_EVT_MASK     0x80
  44
  45 #define KP_ROW_SHIFT            4
  46
  47 #define KP_NO_VALID_KEY_MASK    0x7F
  48
  49 /* bit masks for RESTCTRL register */
  50 #define TC3589x_KBDRST          0x2
  51 #define TC3589x_IRQRST          0x10
  52 #define TC3589x_RESET_ALL       0x1B
  53
  54 /* KBDMFS register bit mask */
  55 #define TC3589x_KBDMFS_EN       0x1
  56
  57 /* CLKEN register bitmask */
  58 #define KPD_CLK_EN              0x1
  59
  60 /* RSTINTCLR register bit mask */
  61 #define IRQ_CLEAR               0x1
  62
  63 /* bit masks for keyboard interrupts*/
  64 #define TC3589x_EVT_LOSS_INT    0x8
  65 #define TC3589x_EVT_INT         0x4
  66 #define TC3589x_KBD_LOSS_INT    0x2
  67 #define TC3589x_KBD_INT         0x1
  68
  69 /* bit masks for keyboard interrupt clear*/
  70 #define TC3589x_EVT_INT_CLR     0x2
  71 #define TC3589x_KBD_INT_CLR     0x1
  72
  73 #define TC3589x_KBD_KEYMAP_SIZE     64
  74
  75 /**
  76  * struct tc_keypad - data structure used by keypad driver
  77  * @input:      pointer to input device object
  78  * @board:      keypad platform device
  79  * @krow:       number of rows
  80  * @kcol:       number of coloumns
  81  * @keymap:     matrix scan code table for keycodes
  82  */
  83 struct tc_keypad {
  84         struct tc3589x *tc3589x;
  85         struct input_dev *input;
  86         const struct tc3589x_keypad_platform_data *board;
  87         unsigned int krow;
  88         unsigned int kcol;
  89         unsigned short keymap[TC3589x_KBD_KEYMAP_SIZE];
  90         bool keypad_stopped;
  91 };
  92
  93 static int tc3589x_keypad_init_key_hardware(struct tc_keypad *keypad)
  94 {
  95         int ret;
  96         struct tc3589x *tc3589x = keypad->tc3589x;
  97         u8 settle_time = keypad->board->settle_time;
  98         u8 dbounce_period = keypad->board->debounce_period;
  99         u8 rows = keypad->board->krow & 0xf;    /* mask out the nibble */
 100         u8 column = keypad->board->kcol & 0xf;  /* mask out the nibble */
 101
 102         /* validate platform configurations */
 103         if (keypad->board->kcol > TC3589x_MAX_KPCOL ||
 104             keypad->board->krow > TC3589x_MAX_KPROW ||
 105             keypad->board->debounce_period > TC3589x_MAX_DEBOUNCE_SETTLE ||
 106             keypad->board->settle_time > TC3589x_MAX_DEBOUNCE_SETTLE)
 107                 return -EINVAL;
 108
 109         /* configure KBDSIZE 4 LSbits for cols and 4 MSbits for rows */
 110         ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSIZE,
 111                         (rows << KP_ROW_SHIFT) | column);
 112         if (ret < 0)
 113                 return ret;
 114
 115         /* configure dedicated key config, no dedicated key selected */
 116         ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_LSB, DEDICATED_KEY_VAL);
 117         if (ret < 0)
 118                 return ret;
 119
 120         ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_MSB, DEDICATED_KEY_VAL);
 121         if (ret < 0)
 122                 return ret;
 123
 124         /* Configure settle time */
 125         ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSETTLE_REG, settle_time);
 126         if (ret < 0)
 127                 return ret;
 128
 129         /* Configure debounce time */
 130         ret = tc3589x_reg_write(tc3589x, TC3589x_KBDBOUNCE, dbounce_period);
 131         if (ret < 0)
 132                 return ret;
 133
 134         /* Start of initialise keypad GPIOs */
 135         ret = tc3589x_set_bits(tc3589x, TC3589x_IOCFG, 0x0, IOCFG_IG);
 136         if (ret < 0)
 137                 return ret;
 138
 139         /* Configure pull-up resistors for all row GPIOs */
 140         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_LSB,
 141                                         TC3589x_PULLUP_ALL_MASK);
 142         if (ret < 0)
 143                 return ret;
 144
 145         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_MSB,
 146                                         TC3589x_PULLUP_ALL_MASK);
 147         if (ret < 0)
 148                 return ret;
 149
 150         /* Configure pull-up resistors for all column GPIOs */
 151         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_LSB,
 152                         TC3589x_PULLUP_ALL_MASK);
 153         if (ret < 0)
 154                 return ret;
 155
 156         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_MSB,
 157                         TC3589x_PULLUP_ALL_MASK);
 158         if (ret < 0)
 159                 return ret;
 160
 161         ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG2_LSB,
 162                         TC3589x_PULLUP_ALL_MASK);
 163
 164         return ret;
 165 }
 166
 167 #define TC35893_DATA_REGS               4
 168 #define TC35893_KEYCODE_FIFO_EMPTY      0x7f
 169 #define TC35893_KEYCODE_FIFO_CLEAR      0xff
 170 #define TC35893_KEYPAD_ROW_SHIFT        0x3
 171
 172 static irqreturn_t tc3589x_keypad_irq(int irq, void *dev)
 173 {
 174         struct tc_keypad *keypad = dev;
 175         struct tc3589x *tc3589x = keypad->tc3589x;
 176         u8 i, row_index, col_index, kbd_code, up;
 177         u8 code;
 178
 179         for (i = 0; i < TC35893_DATA_REGS * 2; i++) {
 180                 kbd_code = tc3589x_reg_read(tc3589x, TC3589x_EVTCODE_FIFO);
 181
 182                 /* loop till fifo is empty and no more keys are pressed */
 183                 if (kbd_code == TC35893_KEYCODE_FIFO_EMPTY ||
 184                                 kbd_code == TC35893_KEYCODE_FIFO_CLEAR)
 185                         continue;
 186
 187                 /* valid key is found */
 188                 col_index = kbd_code & KP_EVCODE_COL_MASK;
 189                 row_index = (kbd_code & KP_EVCODE_ROW_MASK) >> KP_ROW_SHIFT;
 190                 code = MATRIX_SCAN_CODE(row_index, col_index,
 191                                                 TC35893_KEYPAD_ROW_SHIFT);
 192                 up = kbd_code & KP_RELEASE_EVT_MASK;
 193
 194                 input_event(keypad->input, EV_MSC, MSC_SCAN, code);
 195                 input_report_key(keypad->input, keypad->keymap[code], !up);
 196                 input_sync(keypad->input);
 197         }
 198
 199         /* clear IRQ */
 200         tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
 201                         0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
 202         /* enable IRQ */
 203         tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
 204                         0x0, TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
 205
 206         return IRQ_HANDLED;
 207 }
 208
 209 static int tc3589x_keypad_enable(struct tc_keypad *keypad)
 210 {
 211         struct tc3589x *tc3589x = keypad->tc3589x;
 212         int ret;
 213
 214         /* pull the keypad module out of reset */
 215         ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x0);
 216         if (ret < 0)
 217                 return ret;
 218
 219         /* configure KBDMFS */
 220         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMFS, 0x0, TC3589x_KBDMFS_EN);
 221         if (ret < 0)
 222                 return ret;
 223
 224         /* enable the keypad clock */
 225         ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x0, KPD_CLK_EN);
 226         if (ret < 0)
 227                 return ret;
 228
 229         /* clear pending IRQs */
 230         ret =  tc3589x_set_bits(tc3589x, TC3589x_RSTINTCLR, 0x0, 0x1);
 231         if (ret < 0)
 232                 return ret;
 233
 234         /* enable the IRQs */
 235         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK, 0x0,
 236                                         TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
 237         if (ret < 0)
 238                 return ret;
 239
 240         keypad->keypad_stopped = false;
 241
 242         return ret;
 243 }
 244
 245 static int tc3589x_keypad_disable(struct tc_keypad *keypad)
 246 {
 247         struct tc3589x *tc3589x = keypad->tc3589x;
 248         int ret;
 249
 250         /* clear IRQ */
 251         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
 252                         0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
 253         if (ret < 0)
 254                 return ret;
 255
 256         /* disable all interrupts */
 257         ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
 258                         ~(TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT), 0x0);
 259         if (ret < 0)
 260                 return ret;
 261
 262         /* disable the keypad module */
 263         ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x1, 0x0);
 264         if (ret < 0)
 265                 return ret;
 266
 267         /* put the keypad module into reset */
 268         ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x1);
 269
 270         keypad->keypad_stopped = true;
 271
 272         return ret;
 273 }
 274
 275 static int tc3589x_keypad_open(struct input_dev *input)
 276 {
 277         int error;
 278         struct tc_keypad *keypad = input_get_drvdata(input);
 279
 280         /* enable the keypad module */
 281         error = tc3589x_keypad_enable(keypad);
 282         if (error < 0) {
 283                 dev_err(&input->dev, "failed to enable keypad module\n");
 284                 return error;
 285         }
 286
 287         error = tc3589x_keypad_init_key_hardware(keypad);
 288         if (error < 0) {
 289                 dev_err(&input->dev, "failed to configure keypad module\n");
 290                 return error;
 291         }
 292
 293         return 0;
 294 }
 295
 296 static void tc3589x_keypad_close(struct input_dev *input)
 297 {
 298         struct tc_keypad *keypad = input_get_drvdata(input);
 299
 300         /* disable the keypad module */
 301         tc3589x_keypad_disable(keypad);
 302 }
 303
 304 static int __devinit tc3589x_keypad_probe(struct platform_device *pdev)
 305 {
 306         struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
 307         struct tc_keypad *keypad;
 308         struct input_dev *input;
 309         const struct tc3589x_keypad_platform_data *plat;
 310         int error, irq;
 311
 312         plat = tc3589x->pdata->keypad;
 313         if (!plat) {
 314                 dev_err(&pdev->dev, "invalid keypad platform data\n");
 315                 return -EINVAL;
 316         }
 317
 318         irq = platform_get_irq(pdev, 0);
 319         if (irq < 0)
 320                 return irq;
 321
 322         keypad = kzalloc(sizeof(struct tc_keypad), GFP_KERNEL);
 323         input = input_allocate_device();
 324         if (!keypad || !input) {
 325                 dev_err(&pdev->dev, "failed to allocate keypad memory\n");
 326                 error = -ENOMEM;
 327                 goto err_free_mem;
 328         }
 329
 330         keypad->board = plat;
 331         keypad->input = input;
 332         keypad->tc3589x = tc3589x;
 333
 334         input->id.bustype = BUS_I2C;
 335         input->name = pdev->name;
 336         input->dev.parent = &pdev->dev;
 337
 338         input->keycode = keypad->keymap;
 339         input->keycodesize = sizeof(keypad->keymap[0]);
 340         input->keycodemax = ARRAY_SIZE(keypad->keymap);
 341
 342         input->open = tc3589x_keypad_open;
 343         input->close = tc3589x_keypad_close;
 344
 345         input_set_drvdata(input, keypad);
 346
 347         input_set_capability(input, EV_MSC, MSC_SCAN);
 348
 349         __set_bit(EV_KEY, input->evbit);
 350         if (!plat->no_autorepeat)
 351                 __set_bit(EV_REP, input->evbit);
 352
 353         matrix_keypad_build_keymap(plat->keymap_data, 0x3,
 354                         input->keycode, input->keybit);
 355
 356         error = request_threaded_irq(irq, NULL,
 357                         tc3589x_keypad_irq, plat->irqtype,
 358                         "tc3589x-keypad", keypad);
 359         if (error < 0) {
 360                 dev_err(&pdev->dev,
 361                                 "Could not allocate irq %d,error %d\n",
 362                                 irq, error);
 363                 goto err_free_mem;
 364         }
 365
 366         error = input_register_device(input);
 367         if (error) {
 368                 dev_err(&pdev->dev, "Could not register input device\n");
 369                 goto err_free_irq;
 370         }
 371
 372         /* let platform decide if keypad is a wakeup source or not */
 373         device_init_wakeup(&pdev->dev, plat->enable_wakeup);
 374         device_set_wakeup_capable(&pdev->dev, plat->enable_wakeup);
 375
 376         platform_set_drvdata(pdev, keypad);
 377
 378         return 0;
 379
 380 err_free_irq:
 381         free_irq(irq, keypad);
 382 err_free_mem:
 383         input_free_device(input);
 384         kfree(keypad);
 385         return error;
 386 }
 387
 388 static int __devexit tc3589x_keypad_remove(struct platform_device *pdev)
 389 {
 390         struct tc_keypad *keypad = platform_get_drvdata(pdev);
 391         int irq = platform_get_irq(pdev, 0);
 392
 393         if (!keypad->keypad_stopped)
 394                 tc3589x_keypad_disable(keypad);
 395
 396         free_irq(irq, keypad);
 397
 398         input_unregister_device(keypad->input);
 399
 400         kfree(keypad);
 401
 402         return 0;
 403 }
 404
 405 #ifdef CONFIG_PM_SLEEP
 406 static int tc3589x_keypad_suspend(struct device *dev)
 407 {
 408         struct platform_device *pdev = to_platform_device(dev);
 409         struct tc_keypad *keypad = platform_get_drvdata(pdev);
 410         int irq = platform_get_irq(pdev, 0);
 411
 412         /* keypad is already off; we do nothing */
 413         if (keypad->keypad_stopped)
 414                 return 0;
 415
 416         /* if device is not a wakeup source, disable it for powersave */
 417         if (!device_may_wakeup(&pdev->dev))
 418                 tc3589x_keypad_disable(keypad);
 419         else
 420                 enable_irq_wake(irq);
 421
 422         return 0;
 423 }
 424
 425 static int tc3589x_keypad_resume(struct device *dev)
 426 {
 427         struct platform_device *pdev = to_platform_device(dev);
 428         struct tc_keypad *keypad = platform_get_drvdata(pdev);
 429         int irq = platform_get_irq(pdev, 0);
 430
 431         if (!keypad->keypad_stopped)
 432                 return 0;
 433
 434         /* enable the device to resume normal operations */
 435         if (!device_may_wakeup(&pdev->dev))
 436                 tc3589x_keypad_enable(keypad);
 437         else
 438                 disable_irq_wake(irq);
 439
 440         return 0;
 441 }
 442 #endif
 443
 444 static SIMPLE_DEV_PM_OPS(tc3589x_keypad_dev_pm_ops,
 445                          tc3589x_keypad_suspend, tc3589x_keypad_resume);
 446
 447 static struct platform_driver tc3589x_keypad_driver = {
 448         .driver = {
 449                 .name   = "tc3589x-keypad",
 450                 .owner  = THIS_MODULE,
 451                 .pm     = &tc3589x_keypad_dev_pm_ops,
 452         },
 453         .probe  = tc3589x_keypad_probe,
 454         .remove = __devexit_p(tc3589x_keypad_remove),
 455 };
 456
 457 static int __init tc3589x_keypad_init(void)
 458 {
 459         return platform_driver_register(&tc3589x_keypad_driver);
 460 }
 461 module_init(tc3589x_keypad_init);
 462
 463 static void __exit tc3589x_keypad_exit(void)
 464 {
 465         return platform_driver_unregister(&tc3589x_keypad_driver);
 466 }
 467 module_exit(tc3589x_keypad_exit);
 468
 469 MODULE_LICENSE("GPL v2");
 470 MODULE_AUTHOR("Jayeeta Banerjee/Sundar Iyer");
 471 MODULE_DESCRIPTION("TC35893 Keypad Driver");
 472 MODULE_ALIAS("platform:tc3589x-keypad");