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/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/errno.h>
  29 #include <linux/io.h>
  30 #include <linux/of.h>
  31 #include <linux/input.h>
  32 #include <linux/slab.h>
  33 #include <linux/pm_runtime.h>
  34
  35 #include <linux/platform_data/omap4-keypad.h>
  36
  37 /* OMAP4 registers */
  38 #define OMAP4_KBD_REVISION              0x00
  39 #define OMAP4_KBD_SYSCONFIG             0x10
  40 #define OMAP4_KBD_SYSSTATUS             0x14
  41 #define OMAP4_KBD_IRQSTATUS             0x18
  42 #define OMAP4_KBD_IRQENABLE             0x1C
  43 #define OMAP4_KBD_WAKEUPENABLE          0x20
  44 #define OMAP4_KBD_PENDING               0x24
  45 #define OMAP4_KBD_CTRL                  0x28
  46 #define OMAP4_KBD_DEBOUNCINGTIME        0x2C
  47 #define OMAP4_KBD_LONGKEYTIME           0x30
  48 #define OMAP4_KBD_TIMEOUT               0x34
  49 #define OMAP4_KBD_STATEMACHINE          0x38
  50 #define OMAP4_KBD_ROWINPUTS             0x3C
  51 #define OMAP4_KBD_COLUMNOUTPUTS         0x40
  52 #define OMAP4_KBD_FULLCODE31_0          0x44
  53 #define OMAP4_KBD_FULLCODE63_32         0x48
  54
  55 /* OMAP4 bit definitions */
  56 #define OMAP4_DEF_IRQENABLE_EVENTEN     (1 << 0)
  57 #define OMAP4_DEF_IRQENABLE_LONGKEY     (1 << 1)
  58 #define OMAP4_DEF_IRQENABLE_TIMEOUTEN   (1 << 2)
  59 #define OMAP4_DEF_WUP_EVENT_ENA         (1 << 0)
  60 #define OMAP4_DEF_WUP_LONG_KEY_ENA      (1 << 1)
  61 #define OMAP4_DEF_CTRL_NOSOFTMODE       (1 << 1)
  62 #define OMAP4_DEF_CTRLPTVVALUE          (1 << 2)
  63 #define OMAP4_DEF_CTRLPTV               (1 << 1)
  64
  65 /* OMAP4 values */
  66 #define OMAP4_VAL_IRQDISABLE            0x00
  67 #define OMAP4_VAL_DEBOUNCINGTIME        0x07
  68 #define OMAP4_VAL_FUNCTIONALCFG         0x1E
  69
  70 #define OMAP4_MASK_IRQSTATUSDISABLE     0xFFFF
  71
  72 enum {
  73         KBD_REVISION_OMAP4 = 0,
  74         KBD_REVISION_OMAP5,
  75 };
  76
  77 struct omap4_keypad {
  78         struct input_dev *input;
  79
  80         void __iomem *base;
  81         unsigned int irq;
  82
  83         unsigned int rows;
  84         unsigned int cols;
  85         u32 reg_offset;
  86         u32 irqreg_offset;
  87         unsigned int row_shift;
  88         bool no_autorepeat;
  89         unsigned char key_state[8];
  90         unsigned short *keymap;
  91 };
  92
  93 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
  94 {
  95         return __raw_readl(keypad_data->base +
  96                                 keypad_data->reg_offset + offset);
  97 }
  98
  99 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
 100 {
 101         __raw_writel(value,
 102                      keypad_data->base + keypad_data->reg_offset + offset);
 103 }
 104
 105 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
 106 {
 107         return __raw_readl(keypad_data->base +
 108                                 keypad_data->irqreg_offset + offset);
 109 }
 110
 111 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
 112                              u32 offset, u32 value)
 113 {
 114         __raw_writel(value,
 115                      keypad_data->base + keypad_data->irqreg_offset + offset);
 116 }
 117
 118
 119 /* Interrupt handler */
 120 static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
 121 {
 122         struct omap4_keypad *keypad_data = dev_id;
 123         struct input_dev *input_dev = keypad_data->input;
 124         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
 125         unsigned int col, row, code, changed;
 126         u32 *new_state = (u32 *) key_state;
 127
 128         /* Disable interrupts */
 129         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 130                          OMAP4_VAL_IRQDISABLE);
 131
 132         *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 133         *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 134
 135         for (row = 0; row < keypad_data->rows; row++) {
 136                 changed = key_state[row] ^ keypad_data->key_state[row];
 137                 if (!changed)
 138                         continue;
 139
 140                 for (col = 0; col < keypad_data->cols; col++) {
 141                         if (changed & (1 << col)) {
 142                                 code = MATRIX_SCAN_CODE(row, col,
 143                                                 keypad_data->row_shift);
 144                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 145                                 input_report_key(input_dev,
 146                                                  keypad_data->keymap[code],
 147                                                  key_state[row] & (1 << col));
 148                         }
 149                 }
 150         }
 151
 152         input_sync(input_dev);
 153
 154         memcpy(keypad_data->key_state, key_state,
 155                 sizeof(keypad_data->key_state));
 156
 157         /* clear pending interrupts */
 158         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 159                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 160
 161         /* enable interrupts */
 162         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 163                 OMAP4_DEF_IRQENABLE_EVENTEN |
 164                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 165
 166         return IRQ_HANDLED;
 167 }
 168
 169 static int omap4_keypad_open(struct input_dev *input)
 170 {
 171         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 172
 173         pm_runtime_get_sync(input->dev.parent);
 174
 175         disable_irq(keypad_data->irq);
 176
 177         kbd_writel(keypad_data, OMAP4_KBD_CTRL,
 178                         OMAP4_VAL_FUNCTIONALCFG);
 179         kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
 180                         OMAP4_VAL_DEBOUNCINGTIME);
 181         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 182                         OMAP4_VAL_IRQDISABLE);
 183         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 184                         OMAP4_DEF_IRQENABLE_EVENTEN |
 185                                 OMAP4_DEF_IRQENABLE_LONGKEY);
 186         kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
 187                         OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
 188
 189         enable_irq(keypad_data->irq);
 190
 191         return 0;
 192 }
 193
 194 static void omap4_keypad_close(struct input_dev *input)
 195 {
 196         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 197
 198         disable_irq(keypad_data->irq);
 199
 200         /* Disable interrupts */
 201         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 202                          OMAP4_VAL_IRQDISABLE);
 203
 204         /* clear pending interrupts */
 205         kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 206                          kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 207
 208         enable_irq(keypad_data->irq);
 209
 210         pm_runtime_put_sync(input->dev.parent);
 211 }
 212
 213 #ifdef CONFIG_OF
 214 static int omap4_keypad_parse_dt(struct device *dev,
 215                                  struct omap4_keypad *keypad_data)
 216 {
 217         struct device_node *np = dev->of_node;
 218         int err;
 219
 220         err = matrix_keypad_parse_of_params(dev, &keypad_data->rows,
 221                                             &keypad_data->cols);
 222         if (err)
 223                 return err;
 224
 225         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 226                 keypad_data->no_autorepeat = true;
 227
 228         return 0;
 229 }
 230 #else
 231 static inline int omap4_keypad_parse_dt(struct device *dev,
 232                                         struct omap4_keypad *keypad_data)
 233 {
 234         return -ENOSYS;
 235 }
 236 #endif
 237
 238 static int omap4_keypad_probe(struct platform_device *pdev)
 239 {
 240         const struct omap4_keypad_platform_data *pdata =
 241                                 dev_get_platdata(&pdev->dev);
 242         const struct matrix_keymap_data *keymap_data =
 243                                 pdata ? pdata->keymap_data : NULL;
 244         struct omap4_keypad *keypad_data;
 245         struct input_dev *input_dev;
 246         struct resource *res;
 247         unsigned int max_keys;
 248         int rev;
 249         int irq;
 250         int error;
 251
 252         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 253         if (!res) {
 254                 dev_err(&pdev->dev, "no base address specified\n");
 255                 return -EINVAL;
 256         }
 257
 258         irq = platform_get_irq(pdev, 0);
 259         if (!irq) {
 260                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
 261                 return -EINVAL;
 262         }
 263
 264         keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
 265         if (!keypad_data) {
 266                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
 267                 return -ENOMEM;
 268         }
 269
 270         keypad_data->irq = irq;
 271
 272         if (pdata) {
 273                 keypad_data->rows = pdata->rows;
 274                 keypad_data->cols = pdata->cols;
 275         } else {
 276                 error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
 277                 if (error)
 278                         return error;
 279         }
 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 = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
 351                                       GFP_KERNEL);
 352         if (!keypad_data->keymap) {
 353                 dev_err(&pdev->dev, "Not enough memory for keymap\n");
 354                 error = -ENOMEM;
 355                 goto err_free_input;
 356         }
 357
 358         error = matrix_keypad_build_keymap(keymap_data, NULL,
 359                                            keypad_data->rows, keypad_data->cols,
 360                                            keypad_data->keymap, input_dev);
 361         if (error) {
 362                 dev_err(&pdev->dev, "failed to build keymap\n");
 363                 goto err_free_keymap;
 364         }
 365
 366         error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
 367                              IRQF_TRIGGER_RISING,
 368                              "omap4-keypad", keypad_data);
 369         if (error) {
 370                 dev_err(&pdev->dev, "failed to register interrupt\n");
 371                 goto err_free_input;
 372         }
 373
 374         pm_runtime_put_sync(&pdev->dev);
 375
 376         error = input_register_device(keypad_data->input);
 377         if (error < 0) {
 378                 dev_err(&pdev->dev, "failed to register input device\n");
 379                 goto err_pm_disable;
 380         }
 381
 382         platform_set_drvdata(pdev, keypad_data);
 383         return 0;
 384
 385 err_pm_disable:
 386         pm_runtime_disable(&pdev->dev);
 387         free_irq(keypad_data->irq, keypad_data);
 388 err_free_keymap:
 389         kfree(keypad_data->keymap);
 390 err_free_input:
 391         input_free_device(input_dev);
 392 err_pm_put_sync:
 393         pm_runtime_put_sync(&pdev->dev);
 394 err_unmap:
 395         iounmap(keypad_data->base);
 396 err_release_mem:
 397         release_mem_region(res->start, resource_size(res));
 398 err_free_keypad:
 399         kfree(keypad_data);
 400         return error;
 401 }
 402
 403 static int omap4_keypad_remove(struct platform_device *pdev)
 404 {
 405         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 406         struct resource *res;
 407
 408         free_irq(keypad_data->irq, keypad_data);
 409
 410         pm_runtime_disable(&pdev->dev);
 411
 412         input_unregister_device(keypad_data->input);
 413
 414         iounmap(keypad_data->base);
 415
 416         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 417         release_mem_region(res->start, resource_size(res));
 418
 419         kfree(keypad_data->keymap);
 420         kfree(keypad_data);
 421
 422         return 0;
 423 }
 424
 425 #ifdef CONFIG_OF
 426 static const struct of_device_id omap_keypad_dt_match[] = {
 427         { .compatible = "ti,omap4-keypad" },
 428         {},
 429 };
 430 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
 431 #endif
 432
 433 static struct platform_driver omap4_keypad_driver = {
 434         .probe          = omap4_keypad_probe,
 435         .remove         = omap4_keypad_remove,
 436         .driver         = {
 437                 .name   = "omap4-keypad",
 438                 .owner  = THIS_MODULE,
 439                 .of_match_table = of_match_ptr(omap_keypad_dt_match),
 440         },
 441 };
 442 module_platform_driver(omap4_keypad_driver);
 443
 444 MODULE_AUTHOR("Texas Instruments");
 445 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 446 MODULE_LICENSE("GPL");
 447 MODULE_ALIAS("platform:omap4-keypad");