drivers/input/keyboard/omap4-keypad.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OMAP4 Keypad Driver
   4  *
   5  * Copyright (C) 2010 Texas Instruments
   6  *
   7  * Author: Abraham Arce <x0066660@ti.com>
   8  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/errno.h>
  15 #include <linux/io.h>
  16 #include <linux/of.h>
  17 #include <linux/input.h>
  18 #include <linux/input/matrix_keypad.h>
  19 #include <linux/slab.h>
  20 #include <linux/pm_runtime.h>
  21
  22 /* OMAP4 registers */
  23 #define OMAP4_KBD_REVISION              0x00
  24 #define OMAP4_KBD_SYSCONFIG             0x10
  25 #define OMAP4_KBD_SYSSTATUS             0x14
  26 #define OMAP4_KBD_IRQSTATUS             0x18
  27 #define OMAP4_KBD_IRQENABLE             0x1C
  28 #define OMAP4_KBD_WAKEUPENABLE          0x20
  29 #define OMAP4_KBD_PENDING               0x24
  30 #define OMAP4_KBD_CTRL                  0x28
  31 #define OMAP4_KBD_DEBOUNCINGTIME        0x2C
  32 #define OMAP4_KBD_LONGKEYTIME           0x30
  33 #define OMAP4_KBD_TIMEOUT               0x34
  34 #define OMAP4_KBD_STATEMACHINE          0x38
  35 #define OMAP4_KBD_ROWINPUTS             0x3C
  36 #define OMAP4_KBD_COLUMNOUTPUTS         0x40
  37 #define OMAP4_KBD_FULLCODE31_0          0x44
  38 #define OMAP4_KBD_FULLCODE63_32         0x48
  39
  40 /* OMAP4 bit definitions */
  41 #define OMAP4_DEF_IRQENABLE_EVENTEN     BIT(0)
  42 #define OMAP4_DEF_IRQENABLE_LONGKEY     BIT(1)
  43 #define OMAP4_DEF_WUP_EVENT_ENA         BIT(0)
  44 #define OMAP4_DEF_WUP_LONG_KEY_ENA      BIT(1)
  45 #define OMAP4_DEF_CTRL_NOSOFTMODE       BIT(1)
  46 #define OMAP4_DEF_CTRL_PTV_SHIFT        2
  47
  48 /* OMAP4 values */
  49 #define OMAP4_VAL_IRQDISABLE            0x0
  50
  51 /*
  52  * Errata i689: If a key is released for a time shorter than debounce time,
  53  * the keyboard will idle and never detect the key release. The workaround
  54  * is to use at least a 12ms debounce time. See omap5432 TRM chapter
  55  * "26.4.6.2 Keyboard Controller Timer" for more information.
  56  */
  57 #define OMAP4_KEYPAD_PTV_DIV_128        0x6
  58 #define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv)     \
  59         ((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1)
  60 #define OMAP4_VAL_DEBOUNCINGTIME_16MS                                   \
  61         OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128)
  62
  63 enum {
  64         KBD_REVISION_OMAP4 = 0,
  65         KBD_REVISION_OMAP5,
  66 };
  67
  68 struct omap4_keypad {
  69         struct input_dev *input;
  70
  71         void __iomem *base;
  72         bool irq_wake_enabled;
  73         unsigned int irq;
  74
  75         unsigned int rows;
  76         unsigned int cols;
  77         u32 reg_offset;
  78         u32 irqreg_offset;
  79         unsigned int row_shift;
  80         bool no_autorepeat;
  81         unsigned char key_state[8];
  82         unsigned short *keymap;
  83 };
  84
  85 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
  86 {
  87         return __raw_readl(keypad_data->base +
  88                                 keypad_data->reg_offset + offset);
  89 }
  90
  91 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
  92 {
  93         __raw_writel(value,
  94                      keypad_data->base + keypad_data->reg_offset + offset);
  95 }
  96
  97 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
  98 {
  99         return __raw_readl(keypad_data->base +
 100                                 keypad_data->irqreg_offset + offset);
 101 }
 102
 103 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
 104                              u32 offset, u32 value)
 105 {
 106         __raw_writel(value,
 107                      keypad_data->base + keypad_data->irqreg_offset + offset);
 108 }
 109
 110
 111 /* Interrupt handlers */
 112 static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
 113 {
 114         struct omap4_keypad *keypad_data = dev_id;
 115
 116         if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
 117                 return IRQ_WAKE_THREAD;
 118
 119         return IRQ_NONE;
 120 }
 121
 122 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 123 {
 124         struct omap4_keypad *keypad_data = dev_id;
 125         struct input_dev *input_dev = keypad_data->input;
 126         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
 127         unsigned int col, row, code, changed;
 128         u32 *new_state = (u32 *) key_state;
 129
 130         *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 131         *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 132
 133         for (row = 0; row < keypad_data->rows; row++) {
 134                 changed = key_state[row] ^ keypad_data->key_state[row];
 135                 if (!changed)
 136                         continue;
 137
 138                 for (col = 0; col < keypad_data->cols; col++) {
 139                         if (changed & (1 << col)) {
 140                                 code = MATRIX_SCAN_CODE(row, col,
 141                                                 keypad_data->row_shift);
 142                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 143                                 input_report_key(input_dev,
 144                                                  keypad_data->keymap[code],
 145                                                  key_state[row] & (1 << col));
 146                         }
 147                 }
 148         }
 149
 150         input_sync(input_dev);
 151
 152         memcpy(keypad_data->key_state, key_state,
 153                 sizeof(keypad_data->key_state));
 154
 155         /* clear pending interrupts */
 156         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 157                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 158
 159         return IRQ_HANDLED;
 160 }
 161
 162 static int omap4_keypad_open(struct input_dev *input)
 163 {
 164         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 165
 166         pm_runtime_get_sync(input->dev.parent);
 167
 168         disable_irq(keypad_data->irq);
 169
 170         kbd_writel(keypad_data, OMAP4_KBD_CTRL,
 171                         OMAP4_DEF_CTRL_NOSOFTMODE |
 172                         (OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
 173         kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
 174                         OMAP4_VAL_DEBOUNCINGTIME_16MS);
 175         /* clear pending interrupts */
 176         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 177                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 178         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 179                         OMAP4_DEF_IRQENABLE_EVENTEN |
 180                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 181         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
 182                         OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
 183
 184         enable_irq(keypad_data->irq);
 185
 186         return 0;
 187 }
 188
 189 static void omap4_keypad_close(struct input_dev *input)
 190 {
 191         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 192
 193         disable_irq(keypad_data->irq);
 194
 195         /* Disable interrupts and wake-up events */
 196         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 197                          OMAP4_VAL_IRQDISABLE);
 198         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);
 199
 200         /* clear pending interrupts */
 201         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 202                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 203
 204         enable_irq(keypad_data->irq);
 205
 206         pm_runtime_put_sync(input->dev.parent);
 207 }
 208
 209 static int omap4_keypad_parse_dt(struct device *dev,
 210                                  struct omap4_keypad *keypad_data)
 211 {
 212         struct device_node *np = dev->of_node;
 213         int err;
 214
 215         err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
 216                                              &keypad_data->cols);
 217         if (err)
 218                 return err;
 219
 220         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 221                 keypad_data->no_autorepeat = true;
 222
 223         return 0;
 224 }
 225
 226 static int omap4_keypad_probe(struct platform_device *pdev)
 227 {
 228         struct omap4_keypad *keypad_data;
 229         struct input_dev *input_dev;
 230         struct resource *res;
 231         unsigned int max_keys;
 232         int rev;
 233         int irq;
 234         int error;
 235
 236         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 237         if (!res) {
 238                 dev_err(&pdev->dev, "no base address specified\n");
 239                 return -EINVAL;
 240         }
 241
 242         irq = platform_get_irq(pdev, 0);
 243         if (!irq) {
 244                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
 245                 return -EINVAL;
 246         }
 247
 248         keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
 249         if (!keypad_data) {
 250                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
 251                 return -ENOMEM;
 252         }
 253
 254         keypad_data->irq = irq;
 255
 256         error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
 257         if (error)
 258                 goto err_free_keypad;
 259
 260         res = request_mem_region(res->start, resource_size(res), pdev->name);
 261         if (!res) {
 262                 dev_err(&pdev->dev, "can't request mem region\n");
 263                 error = -EBUSY;
 264                 goto err_free_keypad;
 265         }
 266
 267         keypad_data->base = ioremap(res->start, resource_size(res));
 268         if (!keypad_data->base) {
 269                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
 270                 error = -ENOMEM;
 271                 goto err_release_mem;
 272         }
 273
 274
 275         /*
 276          * Enable clocks for the keypad module so that we can read
 277          * revision register.
 278          */
 279         pm_runtime_enable(&pdev->dev);
 280         error = pm_runtime_get_sync(&pdev->dev);
 281         if (error) {
 282                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 283                 goto err_unmap;
 284         }
 285         rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
 286         rev &= 0x03 << 30;
 287         rev >>= 30;
 288         switch (rev) {
 289         case KBD_REVISION_OMAP4:
 290                 keypad_data->reg_offset = 0x00;
 291                 keypad_data->irqreg_offset = 0x00;
 292                 break;
 293         case KBD_REVISION_OMAP5:
 294                 keypad_data->reg_offset = 0x10;
 295                 keypad_data->irqreg_offset = 0x0c;
 296                 break;
 297         default:
 298                 dev_err(&pdev->dev,
 299                         "Keypad reports unsupported revision %d", rev);
 300                 error = -EINVAL;
 301                 goto err_pm_put_sync;
 302         }
 303
 304         /* input device allocation */
 305         keypad_data->input = input_dev = input_allocate_device();
 306         if (!input_dev) {
 307                 error = -ENOMEM;
 308                 goto err_pm_put_sync;
 309         }
 310
 311         input_dev->name = pdev->name;
 312         input_dev->dev.parent = &pdev->dev;
 313         input_dev->id.bustype = BUS_HOST;
 314         input_dev->id.vendor = 0x0001;
 315         input_dev->id.product = 0x0001;
 316         input_dev->id.version = 0x0001;
 317
 318         input_dev->open = omap4_keypad_open;
 319         input_dev->close = omap4_keypad_close;
 320
 321         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 322         if (!keypad_data->no_autorepeat)
 323                 __set_bit(EV_REP, input_dev->evbit);
 324
 325         input_set_drvdata(input_dev, keypad_data);
 326
 327         keypad_data->row_shift = get_count_order(keypad_data->cols);
 328         max_keys = keypad_data->rows << keypad_data->row_shift;
 329         keypad_data->keymap = kcalloc(max_keys,
 330                                       sizeof(keypad_data->keymap[0]),
 331                                       GFP_KERNEL);
 332         if (!keypad_data->keymap) {
 333                 dev_err(&pdev->dev, "Not enough memory for keymap\n");
 334                 error = -ENOMEM;
 335                 goto err_free_input;
 336         }
 337
 338         error = matrix_keypad_build_keymap(NULL, NULL,
 339                                            keypad_data->rows, keypad_data->cols,
 340                                            keypad_data->keymap, input_dev);
 341         if (error) {
 342                 dev_err(&pdev->dev, "failed to build keymap\n");
 343                 goto err_free_keymap;
 344         }
 345
 346         error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
 347                                      omap4_keypad_irq_thread_fn, IRQF_ONESHOT,
 348                                      "omap4-keypad", keypad_data);
 349         if (error) {
 350                 dev_err(&pdev->dev, "failed to register interrupt\n");
 351                 goto err_free_keymap;
 352         }
 353
 354         device_init_wakeup(&pdev->dev, true);
 355         pm_runtime_put_sync(&pdev->dev);
 356
 357         error = input_register_device(keypad_data->input);
 358         if (error < 0) {
 359                 dev_err(&pdev->dev, "failed to register input device\n");
 360                 goto err_pm_disable;
 361         }
 362
 363         platform_set_drvdata(pdev, keypad_data);
 364         return 0;
 365
 366 err_pm_disable:
 367         pm_runtime_disable(&pdev->dev);
 368         free_irq(keypad_data->irq, keypad_data);
 369 err_free_keymap:
 370         kfree(keypad_data->keymap);
 371 err_free_input:
 372         input_free_device(input_dev);
 373 err_pm_put_sync:
 374         pm_runtime_put_sync(&pdev->dev);
 375 err_unmap:
 376         iounmap(keypad_data->base);
 377 err_release_mem:
 378         release_mem_region(res->start, resource_size(res));
 379 err_free_keypad:
 380         kfree(keypad_data);
 381         return error;
 382 }
 383
 384 static int omap4_keypad_remove(struct platform_device *pdev)
 385 {
 386         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 387         struct resource *res;
 388
 389         free_irq(keypad_data->irq, keypad_data);
 390
 391         pm_runtime_disable(&pdev->dev);
 392
 393         input_unregister_device(keypad_data->input);
 394
 395         iounmap(keypad_data->base);
 396
 397         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 398         release_mem_region(res->start, resource_size(res));
 399
 400         kfree(keypad_data->keymap);
 401         kfree(keypad_data);
 402
 403         return 0;
 404 }
 405
 406 static const struct of_device_id omap_keypad_dt_match[] = {
 407         { .compatible = "ti,omap4-keypad" },
 408         {},
 409 };
 410 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
 411
 412 #ifdef CONFIG_PM_SLEEP
 413 static int omap4_keypad_suspend(struct device *dev)
 414 {
 415         struct platform_device *pdev = to_platform_device(dev);
 416         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 417         int error;
 418
 419         if (device_may_wakeup(&pdev->dev)) {
 420                 error = enable_irq_wake(keypad_data->irq);
 421                 if (!error)
 422                         keypad_data->irq_wake_enabled = true;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int omap4_keypad_resume(struct device *dev)
 429 {
 430         struct platform_device *pdev = to_platform_device(dev);
 431         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 432
 433         if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
 434                 disable_irq_wake(keypad_data->irq);
 435                 keypad_data->irq_wake_enabled = false;
 436         }
 437
 438         return 0;
 439 }
 440 #endif
 441
 442 static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
 443                          omap4_keypad_suspend, omap4_keypad_resume);
 444
 445 static struct platform_driver omap4_keypad_driver = {
 446         .probe          = omap4_keypad_probe,
 447         .remove         = omap4_keypad_remove,
 448         .driver         = {
 449                 .name   = "omap4-keypad",
 450                 .pm     = &omap4_keypad_pm_ops,
 451                 .of_match_table = omap_keypad_dt_match,
 452         },
 453 };
 454 module_platform_driver(omap4_keypad_driver);
 455
 456 MODULE_AUTHOR("Texas Instruments");
 457 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 458 MODULE_LICENSE("GPL");
 459 MODULE_ALIAS("platform:omap4-keypad");