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                 /* Disable interrupts */
 131                 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 132                                  OMAP4_VAL_IRQDISABLE);
 133                 return IRQ_WAKE_THREAD;
 134         }
 135
 136         return IRQ_NONE;
 137 }
 138
 139 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 140 {
 141         struct omap4_keypad *keypad_data = dev_id;
 142         struct input_dev *input_dev = keypad_data->input;
 143         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
 144         unsigned int col, row, code, changed;
 145         u32 *new_state = (u32 *) key_state;
 146
 147         *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 148         *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 149
 150         for (row = 0; row < keypad_data->rows; row++) {
 151                 changed = key_state[row] ^ keypad_data->key_state[row];
 152                 if (!changed)
 153                         continue;
 154
 155                 for (col = 0; col < keypad_data->cols; col++) {
 156                         if (changed & (1 << col)) {
 157                                 code = MATRIX_SCAN_CODE(row, col,
 158                                                 keypad_data->row_shift);
 159                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 160                                 input_report_key(input_dev,
 161                                                  keypad_data->keymap[code],
 162                                                  key_state[row] & (1 << col));
 163                         }
 164                 }
 165         }
 166
 167         input_sync(input_dev);
 168
 169         memcpy(keypad_data->key_state, key_state,
 170                 sizeof(keypad_data->key_state));
 171
 172         /* clear pending interrupts */
 173         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 174                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 175
 176         /* enable interrupts */
 177         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 178                 OMAP4_DEF_IRQENABLE_EVENTEN |
 179                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 180
 181         return IRQ_HANDLED;
 182 }
 183
 184 static int omap4_keypad_open(struct input_dev *input)
 185 {
 186         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 187
 188         pm_runtime_get_sync(input->dev.parent);
 189
 190         disable_irq(keypad_data->irq);
 191
 192         kbd_writel(keypad_data, OMAP4_KBD_CTRL,
 193                         OMAP4_DEF_CTRL_NOSOFTMODE |
 194                         (OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
 195         kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
 196                         OMAP4_VAL_DEBOUNCINGTIME_16MS);
 197         /* clear pending interrupts */
 198         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 199                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 200         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 201                         OMAP4_DEF_IRQENABLE_EVENTEN |
 202                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 203         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
 204                         OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
 205
 206         enable_irq(keypad_data->irq);
 207
 208         return 0;
 209 }
 210
 211 static void omap4_keypad_close(struct input_dev *input)
 212 {
 213         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 214
 215         disable_irq(keypad_data->irq);
 216
 217         /* Disable interrupts */
 218         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 219                          OMAP4_VAL_IRQDISABLE);
 220
 221         /* clear pending interrupts */
 222         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 223                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 224
 225         enable_irq(keypad_data->irq);
 226
 227         pm_runtime_put_sync(input->dev.parent);
 228 }
 229
 230 static int omap4_keypad_parse_dt(struct device *dev,
 231                                  struct omap4_keypad *keypad_data)
 232 {
 233         struct device_node *np = dev->of_node;
 234         int err;
 235
 236         err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
 237                                              &keypad_data->cols);
 238         if (err)
 239                 return err;
 240
 241         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 242                 keypad_data->no_autorepeat = true;
 243
 244         return 0;
 245 }
 246
 247 static int omap4_keypad_probe(struct platform_device *pdev)
 248 {
 249         struct omap4_keypad *keypad_data;
 250         struct input_dev *input_dev;
 251         struct resource *res;
 252         unsigned int max_keys;
 253         int rev;
 254         int irq;
 255         int error;
 256
 257         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 258         if (!res) {
 259                 dev_err(&pdev->dev, "no base address specified\n");
 260                 return -EINVAL;
 261         }
 262
 263         irq = platform_get_irq(pdev, 0);
 264         if (!irq) {
 265                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
 266                 return -EINVAL;
 267         }
 268
 269         keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
 270         if (!keypad_data) {
 271                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
 272                 return -ENOMEM;
 273         }
 274
 275         keypad_data->irq = irq;
 276
 277         error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
 278         if (error)
 279                 goto err_free_keypad;
 280
 281         res = request_mem_region(res->start, resource_size(res), pdev->name);
 282         if (!res) {
 283                 dev_err(&pdev->dev, "can't request mem region\n");
 284                 error = -EBUSY;
 285                 goto err_free_keypad;
 286         }
 287
 288         keypad_data->base = ioremap(res->start, resource_size(res));
 289         if (!keypad_data->base) {
 290                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
 291                 error = -ENOMEM;
 292                 goto err_release_mem;
 293         }
 294
 295
 296         /*
 297          * Enable clocks for the keypad module so that we can read
 298          * revision register.
 299          */
 300         pm_runtime_enable(&pdev->dev);
 301         error = pm_runtime_get_sync(&pdev->dev);
 302         if (error) {
 303                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 304                 goto err_unmap;
 305         }
 306         rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
 307         rev &= 0x03 << 30;
 308         rev >>= 30;
 309         switch (rev) {
 310         case KBD_REVISION_OMAP4:
 311                 keypad_data->reg_offset = 0x00;
 312                 keypad_data->irqreg_offset = 0x00;
 313                 break;
 314         case KBD_REVISION_OMAP5:
 315                 keypad_data->reg_offset = 0x10;
 316                 keypad_data->irqreg_offset = 0x0c;
 317                 break;
 318         default:
 319                 dev_err(&pdev->dev,
 320                         "Keypad reports unsupported revision %d", rev);
 321                 error = -EINVAL;
 322                 goto err_pm_put_sync;
 323         }
 324
 325         /* input device allocation */
 326         keypad_data->input = input_dev = input_allocate_device();
 327         if (!input_dev) {
 328                 error = -ENOMEM;
 329                 goto err_pm_put_sync;
 330         }
 331
 332         input_dev->name = pdev->name;
 333         input_dev->dev.parent = &pdev->dev;
 334         input_dev->id.bustype = BUS_HOST;
 335         input_dev->id.vendor = 0x0001;
 336         input_dev->id.product = 0x0001;
 337         input_dev->id.version = 0x0001;
 338
 339         input_dev->open = omap4_keypad_open;
 340         input_dev->close = omap4_keypad_close;
 341
 342         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 343         if (!keypad_data->no_autorepeat)
 344                 __set_bit(EV_REP, input_dev->evbit);
 345
 346         input_set_drvdata(input_dev, keypad_data);
 347
 348         keypad_data->row_shift = get_count_order(keypad_data->cols);
 349         max_keys = keypad_data->rows << keypad_data->row_shift;
 350         keypad_data->keymap = kcalloc(max_keys,
 351                                       sizeof(keypad_data->keymap[0]),
 352                                       GFP_KERNEL);
 353         if (!keypad_data->keymap) {
 354                 dev_err(&pdev->dev, "Not enough memory for keymap\n");
 355                 error = -ENOMEM;
 356                 goto err_free_input;
 357         }
 358
 359         error = matrix_keypad_build_keymap(NULL, NULL,
 360                                            keypad_data->rows, keypad_data->cols,
 361                                            keypad_data->keymap, input_dev);
 362         if (error) {
 363                 dev_err(&pdev->dev, "failed to build keymap\n");
 364                 goto err_free_keymap;
 365         }
 366
 367         error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
 368                                      omap4_keypad_irq_thread_fn, 0,
 369                                      "omap4-keypad", keypad_data);
 370         if (error) {
 371                 dev_err(&pdev->dev, "failed to register interrupt\n");
 372                 goto err_free_keymap;
 373         }
 374
 375         device_init_wakeup(&pdev->dev, true);
 376         pm_runtime_put_sync(&pdev->dev);
 377
 378         error = input_register_device(keypad_data->input);
 379         if (error < 0) {
 380                 dev_err(&pdev->dev, "failed to register input device\n");
 381                 goto err_pm_disable;
 382         }
 383
 384         platform_set_drvdata(pdev, keypad_data);
 385         return 0;
 386
 387 err_pm_disable:
 388         pm_runtime_disable(&pdev->dev);
 389         free_irq(keypad_data->irq, keypad_data);
 390 err_free_keymap:
 391         kfree(keypad_data->keymap);
 392 err_free_input:
 393         input_free_device(input_dev);
 394 err_pm_put_sync:
 395         pm_runtime_put_sync(&pdev->dev);
 396 err_unmap:
 397         iounmap(keypad_data->base);
 398 err_release_mem:
 399         release_mem_region(res->start, resource_size(res));
 400 err_free_keypad:
 401         kfree(keypad_data);
 402         return error;
 403 }
 404
 405 static int omap4_keypad_remove(struct platform_device *pdev)
 406 {
 407         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 408         struct resource *res;
 409
 410         free_irq(keypad_data->irq, keypad_data);
 411
 412         pm_runtime_disable(&pdev->dev);
 413
 414         input_unregister_device(keypad_data->input);
 415
 416         iounmap(keypad_data->base);
 417
 418         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 419         release_mem_region(res->start, resource_size(res));
 420
 421         kfree(keypad_data->keymap);
 422         kfree(keypad_data);
 423
 424         return 0;
 425 }
 426
 427 static const struct of_device_id omap_keypad_dt_match[] = {
 428         { .compatible = "ti,omap4-keypad" },
 429         {},
 430 };
 431 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
 432
 433 #ifdef CONFIG_PM_SLEEP
 434 static int omap4_keypad_suspend(struct device *dev)
 435 {
 436         struct platform_device *pdev = to_platform_device(dev);
 437         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 438         int error;
 439
 440         if (device_may_wakeup(&pdev->dev)) {
 441                 error = enable_irq_wake(keypad_data->irq);
 442                 if (!error)
 443                         keypad_data->irq_wake_enabled = true;
 444         }
 445
 446         return 0;
 447 }
 448
 449 static int omap4_keypad_resume(struct device *dev)
 450 {
 451         struct platform_device *pdev = to_platform_device(dev);
 452         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 453
 454         if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
 455                 disable_irq_wake(keypad_data->irq);
 456                 keypad_data->irq_wake_enabled = false;
 457         }
 458
 459         return 0;
 460 }
 461 #endif
 462
 463 static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
 464                          omap4_keypad_suspend, omap4_keypad_resume);
 465
 466 static struct platform_driver omap4_keypad_driver = {
 467         .probe          = omap4_keypad_probe,
 468         .remove         = omap4_keypad_remove,
 469         .driver         = {
 470                 .name   = "omap4-keypad",
 471                 .pm     = &omap4_keypad_pm_ops,
 472                 .of_match_table = omap_keypad_dt_match,
 473         },
 474 };
 475 module_platform_driver(omap4_keypad_driver);
 476
 477 MODULE_AUTHOR("Texas Instruments");
 478 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 479 MODULE_LICENSE("GPL");
 480 MODULE_ALIAS("platform:omap4-keypad");