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 #define OMAP4_VAL_DEBOUNCINGTIME        0x7
  64 #define OMAP4_VAL_PVT                   0x7
  65
  66 enum {
  67         KBD_REVISION_OMAP4 = 0,
  68         KBD_REVISION_OMAP5,
  69 };
  70
  71 struct omap4_keypad {
  72         struct input_dev *input;
  73
  74         void __iomem *base;
  75         bool irq_wake_enabled;
  76         unsigned int irq;
  77
  78         unsigned int rows;
  79         unsigned int cols;
  80         u32 reg_offset;
  81         u32 irqreg_offset;
  82         unsigned int row_shift;
  83         bool no_autorepeat;
  84         unsigned char key_state[8];
  85         unsigned short *keymap;
  86 };
  87
  88 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
  89 {
  90         return __raw_readl(keypad_data->base +
  91                                 keypad_data->reg_offset + offset);
  92 }
  93
  94 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
  95 {
  96         __raw_writel(value,
  97                      keypad_data->base + keypad_data->reg_offset + offset);
  98 }
  99
 100 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
 101 {
 102         return __raw_readl(keypad_data->base +
 103                                 keypad_data->irqreg_offset + offset);
 104 }
 105
 106 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
 107                              u32 offset, u32 value)
 108 {
 109         __raw_writel(value,
 110                      keypad_data->base + keypad_data->irqreg_offset + offset);
 111 }
 112
 113
 114 /* Interrupt handlers */
 115 static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
 116 {
 117         struct omap4_keypad *keypad_data = dev_id;
 118
 119         if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)) {
 120                 /* Disable interrupts */
 121                 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 122                                  OMAP4_VAL_IRQDISABLE);
 123                 return IRQ_WAKE_THREAD;
 124         }
 125
 126         return IRQ_NONE;
 127 }
 128
 129 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 130 {
 131         struct omap4_keypad *keypad_data = dev_id;
 132         struct input_dev *input_dev = keypad_data->input;
 133         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
 134         unsigned int col, row, code, changed;
 135         u32 *new_state = (u32 *) key_state;
 136
 137         *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 138         *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 139
 140         for (row = 0; row < keypad_data->rows; row++) {
 141                 changed = key_state[row] ^ keypad_data->key_state[row];
 142                 if (!changed)
 143                         continue;
 144
 145                 for (col = 0; col < keypad_data->cols; col++) {
 146                         if (changed & (1 << col)) {
 147                                 code = MATRIX_SCAN_CODE(row, col,
 148                                                 keypad_data->row_shift);
 149                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 150                                 input_report_key(input_dev,
 151                                                  keypad_data->keymap[code],
 152                                                  key_state[row] & (1 << col));
 153                         }
 154                 }
 155         }
 156
 157         input_sync(input_dev);
 158
 159         memcpy(keypad_data->key_state, key_state,
 160                 sizeof(keypad_data->key_state));
 161
 162         /* clear pending interrupts */
 163         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 164                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 165
 166         /* enable interrupts */
 167         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 168                 OMAP4_DEF_IRQENABLE_EVENTEN |
 169                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 170
 171         return IRQ_HANDLED;
 172 }
 173
 174 static int omap4_keypad_open(struct input_dev *input)
 175 {
 176         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 177
 178         pm_runtime_get_sync(input->dev.parent);
 179
 180         disable_irq(keypad_data->irq);
 181
 182         kbd_writel(keypad_data, OMAP4_KBD_CTRL,
 183                         OMAP4_DEF_CTRL_NOSOFTMODE |
 184                         (OMAP4_VAL_PVT << OMAP4_DEF_CTRL_PTV_SHIFT));
 185         kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
 186                         OMAP4_VAL_DEBOUNCINGTIME);
 187         /* clear pending interrupts */
 188         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 189                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 190         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 191                         OMAP4_DEF_IRQENABLE_EVENTEN |
 192                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 193         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
 194                         OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
 195
 196         enable_irq(keypad_data->irq);
 197
 198         return 0;
 199 }
 200
 201 static void omap4_keypad_close(struct input_dev *input)
 202 {
 203         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 204
 205         disable_irq(keypad_data->irq);
 206
 207         /* Disable interrupts */
 208         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 209                          OMAP4_VAL_IRQDISABLE);
 210
 211         /* clear pending interrupts */
 212         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 213                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 214
 215         enable_irq(keypad_data->irq);
 216
 217         pm_runtime_put_sync(input->dev.parent);
 218 }
 219
 220 static int omap4_keypad_parse_dt(struct device *dev,
 221                                  struct omap4_keypad *keypad_data)
 222 {
 223         struct device_node *np = dev->of_node;
 224         int err;
 225
 226         err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
 227                                              &keypad_data->cols);
 228         if (err)
 229                 return err;
 230
 231         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 232                 keypad_data->no_autorepeat = true;
 233
 234         return 0;
 235 }
 236
 237 static int omap4_keypad_probe(struct platform_device *pdev)
 238 {
 239         struct omap4_keypad *keypad_data;
 240         struct input_dev *input_dev;
 241         struct resource *res;
 242         unsigned int max_keys;
 243         int rev;
 244         int irq;
 245         int error;
 246
 247         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 248         if (!res) {
 249                 dev_err(&pdev->dev, "no base address specified\n");
 250                 return -EINVAL;
 251         }
 252
 253         irq = platform_get_irq(pdev, 0);
 254         if (!irq) {
 255                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
 256                 return -EINVAL;
 257         }
 258
 259         keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
 260         if (!keypad_data) {
 261                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
 262                 return -ENOMEM;
 263         }
 264
 265         keypad_data->irq = irq;
 266
 267         error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
 268         if (error)
 269                 goto err_free_keypad;
 270
 271         res = request_mem_region(res->start, resource_size(res), pdev->name);
 272         if (!res) {
 273                 dev_err(&pdev->dev, "can't request mem region\n");
 274                 error = -EBUSY;
 275                 goto err_free_keypad;
 276         }
 277
 278         keypad_data->base = ioremap(res->start, resource_size(res));
 279         if (!keypad_data->base) {
 280                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
 281                 error = -ENOMEM;
 282                 goto err_release_mem;
 283         }
 284
 285
 286         /*
 287          * Enable clocks for the keypad module so that we can read
 288          * revision register.
 289          */
 290         pm_runtime_enable(&pdev->dev);
 291         error = pm_runtime_get_sync(&pdev->dev);
 292         if (error) {
 293                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 294                 goto err_unmap;
 295         }
 296         rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
 297         rev &= 0x03 << 30;
 298         rev >>= 30;
 299         switch (rev) {
 300         case KBD_REVISION_OMAP4:
 301                 keypad_data->reg_offset = 0x00;
 302                 keypad_data->irqreg_offset = 0x00;
 303                 break;
 304         case KBD_REVISION_OMAP5:
 305                 keypad_data->reg_offset = 0x10;
 306                 keypad_data->irqreg_offset = 0x0c;
 307                 break;
 308         default:
 309                 dev_err(&pdev->dev,
 310                         "Keypad reports unsupported revision %d", rev);
 311                 error = -EINVAL;
 312                 goto err_pm_put_sync;
 313         }
 314
 315         /* input device allocation */
 316         keypad_data->input = input_dev = input_allocate_device();
 317         if (!input_dev) {
 318                 error = -ENOMEM;
 319                 goto err_pm_put_sync;
 320         }
 321
 322         input_dev->name = pdev->name;
 323         input_dev->dev.parent = &pdev->dev;
 324         input_dev->id.bustype = BUS_HOST;
 325         input_dev->id.vendor = 0x0001;
 326         input_dev->id.product = 0x0001;
 327         input_dev->id.version = 0x0001;
 328
 329         input_dev->open = omap4_keypad_open;
 330         input_dev->close = omap4_keypad_close;
 331
 332         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 333         if (!keypad_data->no_autorepeat)
 334                 __set_bit(EV_REP, input_dev->evbit);
 335
 336         input_set_drvdata(input_dev, keypad_data);
 337
 338         keypad_data->row_shift = get_count_order(keypad_data->cols);
 339         max_keys = keypad_data->rows << keypad_data->row_shift;
 340         keypad_data->keymap = kcalloc(max_keys,
 341                                       sizeof(keypad_data->keymap[0]),
 342                                       GFP_KERNEL);
 343         if (!keypad_data->keymap) {
 344                 dev_err(&pdev->dev, "Not enough memory for keymap\n");
 345                 error = -ENOMEM;
 346                 goto err_free_input;
 347         }
 348
 349         error = matrix_keypad_build_keymap(NULL, NULL,
 350                                            keypad_data->rows, keypad_data->cols,
 351                                            keypad_data->keymap, input_dev);
 352         if (error) {
 353                 dev_err(&pdev->dev, "failed to build keymap\n");
 354                 goto err_free_keymap;
 355         }
 356
 357         error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
 358                                      omap4_keypad_irq_thread_fn, 0,
 359                                      "omap4-keypad", keypad_data);
 360         if (error) {
 361                 dev_err(&pdev->dev, "failed to register interrupt\n");
 362                 goto err_free_keymap;
 363         }
 364
 365         device_init_wakeup(&pdev->dev, true);
 366         pm_runtime_put_sync(&pdev->dev);
 367
 368         error = input_register_device(keypad_data->input);
 369         if (error < 0) {
 370                 dev_err(&pdev->dev, "failed to register input device\n");
 371                 goto err_pm_disable;
 372         }
 373
 374         platform_set_drvdata(pdev, keypad_data);
 375         return 0;
 376
 377 err_pm_disable:
 378         pm_runtime_disable(&pdev->dev);
 379         free_irq(keypad_data->irq, keypad_data);
 380 err_free_keymap:
 381         kfree(keypad_data->keymap);
 382 err_free_input:
 383         input_free_device(input_dev);
 384 err_pm_put_sync:
 385         pm_runtime_put_sync(&pdev->dev);
 386 err_unmap:
 387         iounmap(keypad_data->base);
 388 err_release_mem:
 389         release_mem_region(res->start, resource_size(res));
 390 err_free_keypad:
 391         kfree(keypad_data);
 392         return error;
 393 }
 394
 395 static int omap4_keypad_remove(struct platform_device *pdev)
 396 {
 397         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 398         struct resource *res;
 399
 400         free_irq(keypad_data->irq, keypad_data);
 401
 402         pm_runtime_disable(&pdev->dev);
 403
 404         input_unregister_device(keypad_data->input);
 405
 406         iounmap(keypad_data->base);
 407
 408         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 409         release_mem_region(res->start, resource_size(res));
 410
 411         kfree(keypad_data->keymap);
 412         kfree(keypad_data);
 413
 414         return 0;
 415 }
 416
 417 static const struct of_device_id omap_keypad_dt_match[] = {
 418         { .compatible = "ti,omap4-keypad" },
 419         {},
 420 };
 421 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
 422
 423 #ifdef CONFIG_PM_SLEEP
 424 static int omap4_keypad_suspend(struct device *dev)
 425 {
 426         struct platform_device *pdev = to_platform_device(dev);
 427         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 428         int error;
 429
 430         if (device_may_wakeup(&pdev->dev)) {
 431                 error = enable_irq_wake(keypad_data->irq);
 432                 if (!error)
 433                         keypad_data->irq_wake_enabled = true;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static int omap4_keypad_resume(struct device *dev)
 440 {
 441         struct platform_device *pdev = to_platform_device(dev);
 442         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 443
 444         if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
 445                 disable_irq_wake(keypad_data->irq);
 446                 keypad_data->irq_wake_enabled = false;
 447         }
 448
 449         return 0;
 450 }
 451 #endif
 452
 453 static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
 454                          omap4_keypad_suspend, omap4_keypad_resume);
 455
 456 static struct platform_driver omap4_keypad_driver = {
 457         .probe          = omap4_keypad_probe,
 458         .remove         = omap4_keypad_remove,
 459         .driver         = {
 460                 .name   = "omap4-keypad",
 461                 .pm     = &omap4_keypad_pm_ops,
 462                 .of_match_table = omap_keypad_dt_match,
 463         },
 464 };
 465 module_platform_driver(omap4_keypad_driver);
 466
 467 MODULE_AUTHOR("Texas Instruments");
 468 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 469 MODULE_LICENSE("GPL");
 470 MODULE_ALIAS("platform:omap4-keypad");