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