drivers/input/keyboard/omap4-keypad.c

   1 /*
   2  * OMAP4 Keypad Driver
   3  *
   4  * Copyright (C) 2010 Texas Instruments
   5  *
   6  * Author: Abraham Arce <x0066660@ti.com>
   7  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/errno.h>
  28 #include <linux/io.h>
  29 #include <linux/of.h>
  30 #include <linux/input.h>
  31 #include <linux/input/matrix_keypad.h>
  32 #include <linux/slab.h>
  33 #include <linux/pm_runtime.h>
  34
  35 /* OMAP4 registers */
  36 #define OMAP4_KBD_REVISION              0x00
  37 #define OMAP4_KBD_SYSCONFIG             0x10
  38 #define OMAP4_KBD_SYSSTATUS             0x14
  39 #define OMAP4_KBD_IRQSTATUS             0x18
  40 #define OMAP4_KBD_IRQENABLE             0x1C
  41 #define OMAP4_KBD_WAKEUPENABLE          0x20
  42 #define OMAP4_KBD_PENDING               0x24
  43 #define OMAP4_KBD_CTRL                  0x28
  44 #define OMAP4_KBD_DEBOUNCINGTIME        0x2C
  45 #define OMAP4_KBD_LONGKEYTIME           0x30
  46 #define OMAP4_KBD_TIMEOUT               0x34
  47 #define OMAP4_KBD_STATEMACHINE          0x38
  48 #define OMAP4_KBD_ROWINPUTS             0x3C
  49 #define OMAP4_KBD_COLUMNOUTPUTS         0x40
  50 #define OMAP4_KBD_FULLCODE31_0          0x44
  51 #define OMAP4_KBD_FULLCODE63_32         0x48
  52
  53 /* OMAP4 bit definitions */
  54 #define OMAP4_DEF_IRQENABLE_EVENTEN     BIT(0)
  55 #define OMAP4_DEF_IRQENABLE_LONGKEY     BIT(1)
  56 #define OMAP4_DEF_WUP_EVENT_ENA         BIT(0)
  57 #define OMAP4_DEF_WUP_LONG_KEY_ENA      BIT(1)
  58 #define OMAP4_DEF_CTRL_NOSOFTMODE       BIT(1)
  59 #define OMAP4_DEF_CTRL_PTV_SHIFT        2
  60
  61 /* OMAP4 values */
  62 #define OMAP4_VAL_IRQDISABLE            0x0
  63
  64 /*
  65  * Errata i689: If a key is released for a time shorter than debounce time,
  66  * the keyboard will idle and never detect the key release. The workaround
  67  * is to use at least a 12ms debounce time. See omap5432 TRM chapter
  68  * "26.4.6.2 Keyboard Controller Timer" for more information.
  69  */
  70 #define OMAP4_KEYPAD_PTV_DIV_128        0x6
  71 #define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv)     \
  72         ((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1)
  73 #define OMAP4_VAL_DEBOUNCINGTIME_16MS                                   \
  74         OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128)
  75
  76 enum {
  77         KBD_REVISION_OMAP4 = 0,
  78         KBD_REVISION_OMAP5,
  79 };
  80
  81 struct omap4_keypad {
  82         struct input_dev *input;
  83
  84         void __iomem *base;
  85         bool irq_wake_enabled;
  86         unsigned int irq;
  87
  88         unsigned int rows;
  89         unsigned int cols;
  90         u32 reg_offset;
  91         u32 irqreg_offset;
  92         unsigned int row_shift;
  93         bool no_autorepeat;
  94         unsigned char key_state[8];
  95         unsigned short *keymap;
  96 };
  97
  98 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
  99 {
 100         return __raw_readl(keypad_data->base +
 101                                 keypad_data->reg_offset + offset);
 102 }
 103
 104 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
 105 {
 106         __raw_writel(value,
 107                      keypad_data->base + keypad_data->reg_offset + offset);
 108 }
 109
 110 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
 111 {
 112         return __raw_readl(keypad_data->base +
 113                                 keypad_data->irqreg_offset + offset);
 114 }
 115
 116 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
 117                              u32 offset, u32 value)
 118 {
 119         __raw_writel(value,
 120                      keypad_data->base + keypad_data->irqreg_offset + offset);
 121 }
 122
 123
 124 /* Interrupt handlers */
 125 static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
 126 {
 127         struct omap4_keypad *keypad_data = dev_id;
 128
 129         if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
 130                 return IRQ_WAKE_THREAD;
 131
 132         return IRQ_NONE;
 133 }
 134
 135 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 136 {
 137         struct omap4_keypad *keypad_data = dev_id;
 138         struct input_dev *input_dev = keypad_data->input;
 139         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
 140         unsigned int col, row, code, changed;
 141         u32 *new_state = (u32 *) key_state;
 142
 143         *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 144         *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 145
 146         for (row = 0; row < keypad_data->rows; row++) {
 147                 changed = key_state[row] ^ keypad_data->key_state[row];
 148                 if (!changed)
 149                         continue;
 150
 151                 for (col = 0; col < keypad_data->cols; col++) {
 152                         if (changed & (1 << col)) {
 153                                 code = MATRIX_SCAN_CODE(row, col,
 154                                                 keypad_data->row_shift);
 155                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 156                                 input_report_key(input_dev,
 157                                                  keypad_data->keymap[code],
 158                                                  key_state[row] & (1 << col));
 159                         }
 160                 }
 161         }
 162
 163         input_sync(input_dev);
 164
 165         memcpy(keypad_data->key_state, key_state,
 166                 sizeof(keypad_data->key_state));
 167
 168         /* clear pending interrupts */
 169         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 170                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 171
 172         return IRQ_HANDLED;
 173 }
 174
 175 static int omap4_keypad_open(struct input_dev *input)
 176 {
 177         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 178
 179         pm_runtime_get_sync(input->dev.parent);
 180
 181         disable_irq(keypad_data->irq);
 182
 183         kbd_writel(keypad_data, OMAP4_KBD_CTRL,
 184                         OMAP4_DEF_CTRL_NOSOFTMODE |
 185                         (OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
 186         kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
 187                         OMAP4_VAL_DEBOUNCINGTIME_16MS);
 188         /* clear pending interrupts */
 189         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 190                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 191         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 192                         OMAP4_DEF_IRQENABLE_EVENTEN |
 193                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 194         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
 195                         OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
 196
 197         enable_irq(keypad_data->irq);
 198
 199         return 0;
 200 }
 201
 202 static void omap4_keypad_close(struct input_dev *input)
 203 {
 204         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 205
 206         disable_irq(keypad_data->irq);
 207
 208         /* Disable interrupts and wake-up events */
 209         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 210                          OMAP4_VAL_IRQDISABLE);
 211         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);
 212
 213         /* clear pending interrupts */
 214         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 215                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 216
 217         enable_irq(keypad_data->irq);
 218
 219         pm_runtime_put_sync(input->dev.parent);
 220 }
 221
 222 static int omap4_keypad_parse_dt(struct device *dev,
 223                                  struct omap4_keypad *keypad_data)
 224 {
 225         struct device_node *np = dev->of_node;
 226         int err;
 227
 228         err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
 229                                              &keypad_data->cols);
 230         if (err)
 231                 return err;
 232
 233         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 234                 keypad_data->no_autorepeat = true;
 235
 236         return 0;
 237 }
 238
 239 static int omap4_keypad_probe(struct platform_device *pdev)
 240 {
 241         struct omap4_keypad *keypad_data;
 242         struct input_dev *input_dev;
 243         struct resource *res;
 244         unsigned int max_keys;
 245         int rev;
 246         int irq;
 247         int error;
 248
 249         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 250         if (!res) {
 251                 dev_err(&pdev->dev, "no base address specified\n");
 252                 return -EINVAL;
 253         }
 254
 255         irq = platform_get_irq(pdev, 0);
 256         if (!irq) {
 257                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
 258                 return -EINVAL;
 259         }
 260
 261         keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
 262         if (!keypad_data) {
 263                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
 264                 return -ENOMEM;
 265         }
 266
 267         keypad_data->irq = irq;
 268
 269         error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
 270         if (error)
 271                 goto err_free_keypad;
 272
 273         res = request_mem_region(res->start, resource_size(res), pdev->name);
 274         if (!res) {
 275                 dev_err(&pdev->dev, "can't request mem region\n");
 276                 error = -EBUSY;
 277                 goto err_free_keypad;
 278         }
 279
 280         keypad_data->base = ioremap(res->start, resource_size(res));
 281         if (!keypad_data->base) {
 282                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
 283                 error = -ENOMEM;
 284                 goto err_release_mem;
 285         }
 286
 287
 288         /*
 289          * Enable clocks for the keypad module so that we can read
 290          * revision register.
 291          */
 292         pm_runtime_enable(&pdev->dev);
 293         error = pm_runtime_get_sync(&pdev->dev);
 294         if (error) {
 295                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 296                 goto err_unmap;
 297         }
 298         rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
 299         rev &= 0x03 << 30;
 300         rev >>= 30;
 301         switch (rev) {
 302         case KBD_REVISION_OMAP4:
 303                 keypad_data->reg_offset = 0x00;
 304                 keypad_data->irqreg_offset = 0x00;
 305                 break;
 306         case KBD_REVISION_OMAP5:
 307                 keypad_data->reg_offset = 0x10;
 308                 keypad_data->irqreg_offset = 0x0c;
 309                 break;
 310         default:
 311                 dev_err(&pdev->dev,
 312                         "Keypad reports unsupported revision %d", rev);
 313                 error = -EINVAL;
 314                 goto err_pm_put_sync;
 315         }
 316
 317         /* input device allocation */
 318         keypad_data->input = input_dev = input_allocate_device();
 319         if (!input_dev) {
 320                 error = -ENOMEM;
 321                 goto err_pm_put_sync;
 322         }
 323
 324         input_dev->name = pdev->name;
 325         input_dev->dev.parent = &pdev->dev;
 326         input_dev->id.bustype = BUS_HOST;
 327         input_dev->id.vendor = 0x0001;
 328         input_dev->id.product = 0x0001;
 329         input_dev->id.version = 0x0001;
 330
 331         input_dev->open = omap4_keypad_open;
 332         input_dev->close = omap4_keypad_close;
 333
 334         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 335         if (!keypad_data->no_autorepeat)
 336                 __set_bit(EV_REP, input_dev->evbit);
 337
 338         input_set_drvdata(input_dev, keypad_data);
 339
 340         keypad_data->row_shift = get_count_order(keypad_data->cols);
 341         max_keys = keypad_data->rows << keypad_data->row_shift;
 342         keypad_data->keymap = kcalloc(max_keys,
 343                                       sizeof(keypad_data->keymap[0]),
 344                                       GFP_KERNEL);
 345         if (!keypad_data->keymap) {
 346                 dev_err(&pdev->dev, "Not enough memory for keymap\n");
 347                 error = -ENOMEM;
 348                 goto err_free_input;
 349         }
 350
 351         error = matrix_keypad_build_keymap(NULL, NULL,
 352                                            keypad_data->rows, keypad_data->cols,
 353                                            keypad_data->keymap, input_dev);
 354         if (error) {
 355                 dev_err(&pdev->dev, "failed to build keymap\n");
 356                 goto err_free_keymap;
 357         }
 358
 359         error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
 360                                      omap4_keypad_irq_thread_fn, IRQF_ONESHOT,
 361                                      "omap4-keypad", keypad_data);
 362         if (error) {
 363                 dev_err(&pdev->dev, "failed to register interrupt\n");
 364                 goto err_free_keymap;
 365         }
 366
 367         device_init_wakeup(&pdev->dev, true);
 368         pm_runtime_put_sync(&pdev->dev);
 369
 370         error = input_register_device(keypad_data->input);
 371         if (error < 0) {
 372                 dev_err(&pdev->dev, "failed to register input device\n");
 373                 goto err_pm_disable;
 374         }
 375
 376         platform_set_drvdata(pdev, keypad_data);
 377         return 0;
 378
 379 err_pm_disable:
 380         pm_runtime_disable(&pdev->dev);
 381         free_irq(keypad_data->irq, keypad_data);
 382 err_free_keymap:
 383         kfree(keypad_data->keymap);
 384 err_free_input:
 385         input_free_device(input_dev);
 386 err_pm_put_sync:
 387         pm_runtime_put_sync(&pdev->dev);
 388 err_unmap:
 389         iounmap(keypad_data->base);
 390 err_release_mem:
 391         release_mem_region(res->start, resource_size(res));
 392 err_free_keypad:
 393         kfree(keypad_data);
 394         return error;
 395 }
 396
 397 static int omap4_keypad_remove(struct platform_device *pdev)
 398 {
 399         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 400         struct resource *res;
 401
 402         free_irq(keypad_data->irq, keypad_data);
 403
 404         pm_runtime_disable(&pdev->dev);
 405
 406         input_unregister_device(keypad_data->input);
 407
 408         iounmap(keypad_data->base);
 409
 410         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 411         release_mem_region(res->start, resource_size(res));
 412
 413         kfree(keypad_data->keymap);
 414         kfree(keypad_data);
 415
 416         return 0;
 417 }
 418
 419 static const struct of_device_id omap_keypad_dt_match[] = {
 420         { .compatible = "ti,omap4-keypad" },
 421         {},
 422 };
 423 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
 424
 425 #ifdef CONFIG_PM_SLEEP
 426 static int omap4_keypad_suspend(struct device *dev)
 427 {
 428         struct platform_device *pdev = to_platform_device(dev);
 429         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 430         int error;
 431
 432         if (device_may_wakeup(&pdev->dev)) {
 433                 error = enable_irq_wake(keypad_data->irq);
 434                 if (!error)
 435                         keypad_data->irq_wake_enabled = true;
 436         }
 437
 438         return 0;
 439 }
 440
 441 static int omap4_keypad_resume(struct device *dev)
 442 {
 443         struct platform_device *pdev = to_platform_device(dev);
 444         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 445
 446         if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
 447                 disable_irq_wake(keypad_data->irq);
 448                 keypad_data->irq_wake_enabled = false;
 449         }
 450
 451         return 0;
 452 }
 453 #endif
 454
 455 static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
 456                          omap4_keypad_suspend, omap4_keypad_resume);
 457
 458 static struct platform_driver omap4_keypad_driver = {
 459         .probe          = omap4_keypad_probe,
 460         .remove         = omap4_keypad_remove,
 461         .driver         = {
 462                 .name   = "omap4-keypad",
 463                 .pm     = &omap4_keypad_pm_ops,
 464                 .of_match_table = omap_keypad_dt_match,
 465         },
 466 };
 467 module_platform_driver(omap4_keypad_driver);
 468
 469 MODULE_AUTHOR("Texas Instruments");
 470 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 471 MODULE_LICENSE("GPL");
 472 MODULE_ALIAS("platform:omap4-keypad");