drivers/input/keyboard/tosakbd.c

   1 /*
   2  *  Keyboard driver for Sharp Tosa models (SL-6000x)
   3  *
   4  *  Copyright (c) 2005 Dirk Opfer
   5  *  Copyright (c) 2007 Dmitry Baryshkov
   6  *
   7  *  Based on xtkbd.c/locomkbd.c/corgikbd.c
   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 version 2 as
  11  *  published by the Free Software Foundation.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/input.h>
  19 #include <linux/delay.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/slab.h>
  22
  23 #include <mach/gpio.h>
  24 #include <mach/tosa.h>
  25
  26 #define KB_ROWMASK(r)           (1 << (r))
  27 #define SCANCODE(r, c)          (((r)<<4) + (c) + 1)
  28 #define NR_SCANCODES            SCANCODE(TOSA_KEY_SENSE_NUM - 1, TOSA_KEY_STROBE_NUM - 1) + 1
  29
  30 #define SCAN_INTERVAL           (HZ/10)
  31
  32 #define KB_DISCHARGE_DELAY      10
  33 #define KB_ACTIVATE_DELAY       10
  34
  35 static unsigned short tosakbd_keycode[NR_SCANCODES] = {
  36 0,
  37 0, KEY_W, 0, 0, 0, KEY_K, KEY_BACKSPACE, KEY_P,
  38 0, 0, 0, 0, 0, 0, 0, 0,
  39 KEY_Q, KEY_E, KEY_T, KEY_Y, 0, KEY_O, KEY_I, KEY_COMMA,
  40 0, 0, 0, 0, 0, 0, 0, 0,
  41 KEY_A, KEY_D, KEY_G, KEY_U, 0, KEY_L, KEY_ENTER, KEY_DOT,
  42 0, 0, 0, 0, 0, 0, 0, 0,
  43 KEY_Z, KEY_C, KEY_V, KEY_J, TOSA_KEY_ADDRESSBOOK, TOSA_KEY_CANCEL, TOSA_KEY_CENTER, TOSA_KEY_OK,
  44 KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, 0,
  45 KEY_S, KEY_R, KEY_B, KEY_N, TOSA_KEY_CALENDAR, TOSA_KEY_HOMEPAGE, KEY_LEFTCTRL, TOSA_KEY_LIGHT,
  46 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,
  47 KEY_TAB, KEY_SLASH, KEY_H, KEY_M, TOSA_KEY_MENU, 0, KEY_UP, 0,
  48 0, 0, TOSA_KEY_FN, 0, 0, 0, 0, 0,
  49 KEY_X, KEY_F, KEY_SPACE, KEY_APOSTROPHE, TOSA_KEY_MAIL, KEY_LEFT, KEY_DOWN, KEY_RIGHT,
  50 0, 0, 0,
  51 };
  52
  53 struct tosakbd {
  54         unsigned short keycode[ARRAY_SIZE(tosakbd_keycode)];
  55         struct input_dev *input;
  56         bool suspended;
  57         spinlock_t lock; /* protect kbd scanning */
  58         struct timer_list timer;
  59 };
  60
  61
  62 /* Helper functions for reading the keyboard matrix
  63  * Note: We should really be using the generic gpio functions to alter
  64  *       GPDR but it requires a function call per GPIO bit which is
  65  *       excessive when we need to access 12 bits at once, multiple times.
  66  * These functions must be called within local_irq_save()/local_irq_restore()
  67  * or similar.
  68  */
  69 #define GET_ROWS_STATUS(c)      ((GPLR2 & TOSA_GPIO_ALL_SENSE_BIT) >> TOSA_GPIO_ALL_SENSE_RSHIFT)
  70
  71 static inline void tosakbd_discharge_all(void)
  72 {
  73         /* STROBE All HiZ */
  74         GPCR1  = TOSA_GPIO_HIGH_STROBE_BIT;
  75         GPDR1 &= ~TOSA_GPIO_HIGH_STROBE_BIT;
  76         GPCR2  = TOSA_GPIO_LOW_STROBE_BIT;
  77         GPDR2 &= ~TOSA_GPIO_LOW_STROBE_BIT;
  78 }
  79
  80 static inline void tosakbd_activate_all(void)
  81 {
  82         /* STROBE ALL -> High */
  83         GPSR1  = TOSA_GPIO_HIGH_STROBE_BIT;
  84         GPDR1 |= TOSA_GPIO_HIGH_STROBE_BIT;
  85         GPSR2  = TOSA_GPIO_LOW_STROBE_BIT;
  86         GPDR2 |= TOSA_GPIO_LOW_STROBE_BIT;
  87
  88         udelay(KB_DISCHARGE_DELAY);
  89
  90         /* STATE CLEAR */
  91         GEDR2 |= TOSA_GPIO_ALL_SENSE_BIT;
  92 }
  93
  94 static inline void tosakbd_activate_col(int col)
  95 {
  96         if (col <= 5) {
  97                 /* STROBE col -> High, not col -> HiZ */
  98                 GPSR1 = TOSA_GPIO_STROBE_BIT(col);
  99                 GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 100         } else {
 101                 /* STROBE col -> High, not col -> HiZ */
 102                 GPSR2 = TOSA_GPIO_STROBE_BIT(col);
 103                 GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 104         }
 105 }
 106
 107 static inline void tosakbd_reset_col(int col)
 108 {
 109         if (col <= 5) {
 110                 /* STROBE col -> Low */
 111                 GPCR1 = TOSA_GPIO_STROBE_BIT(col);
 112                 /* STROBE col -> out, not col -> HiZ */
 113                 GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 114         } else {
 115                 /* STROBE col -> Low */
 116                 GPCR2 = TOSA_GPIO_STROBE_BIT(col);
 117                 /* STROBE col -> out, not col -> HiZ */
 118                 GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
 119         }
 120 }
 121 /*
 122  * The tosa keyboard only generates interrupts when a key is pressed.
 123  * So when a key is pressed, we enable a timer.  This timer scans the
 124  * keyboard, and this is how we detect when the key is released.
 125  */
 126
 127 /* Scan the hardware keyboard and push any changes up through the input layer */
 128 static void tosakbd_scankeyboard(struct platform_device *dev)
 129 {
 130         struct tosakbd *tosakbd = platform_get_drvdata(dev);
 131         unsigned int row, col, rowd;
 132         unsigned long flags;
 133         unsigned int num_pressed = 0;
 134
 135         spin_lock_irqsave(&tosakbd->lock, flags);
 136
 137         if (tosakbd->suspended)
 138                 goto out;
 139
 140         for (col = 0; col < TOSA_KEY_STROBE_NUM; col++) {
 141                 /*
 142                  * Discharge the output driver capacitatance
 143                  * in the keyboard matrix. (Yes it is significant..)
 144                  */
 145                 tosakbd_discharge_all();
 146                 udelay(KB_DISCHARGE_DELAY);
 147
 148                 tosakbd_activate_col(col);
 149                 udelay(KB_ACTIVATE_DELAY);
 150
 151                 rowd = GET_ROWS_STATUS(col);
 152
 153                 for (row = 0; row < TOSA_KEY_SENSE_NUM; row++) {
 154                         unsigned int scancode, pressed;
 155                         scancode = SCANCODE(row, col);
 156                         pressed = rowd & KB_ROWMASK(row);
 157
 158                         if (pressed && !tosakbd->keycode[scancode])
 159                                 dev_warn(&dev->dev,
 160                                                 "unhandled scancode: 0x%02x\n",
 161                                                 scancode);
 162
 163                         input_report_key(tosakbd->input,
 164                                         tosakbd->keycode[scancode],
 165                                         pressed);
 166                         if (pressed)
 167                                 num_pressed++;
 168                 }
 169
 170                 tosakbd_reset_col(col);
 171         }
 172
 173         tosakbd_activate_all();
 174
 175         input_sync(tosakbd->input);
 176
 177         /* if any keys are pressed, enable the timer */
 178         if (num_pressed)
 179                 mod_timer(&tosakbd->timer, jiffies + SCAN_INTERVAL);
 180
 181  out:
 182         spin_unlock_irqrestore(&tosakbd->lock, flags);
 183 }
 184
 185 /*
 186  * tosa keyboard interrupt handler.
 187  */
 188 static irqreturn_t tosakbd_interrupt(int irq, void *__dev)
 189 {
 190         struct platform_device *dev = __dev;
 191         struct tosakbd *tosakbd = platform_get_drvdata(dev);
 192
 193         if (!timer_pending(&tosakbd->timer)) {
 194                 /** wait chattering delay **/
 195                 udelay(20);
 196                 tosakbd_scankeyboard(dev);
 197         }
 198
 199         return IRQ_HANDLED;
 200 }
 201
 202 /*
 203  * tosa timer checking for released keys
 204  */
 205 static void tosakbd_timer_callback(unsigned long __dev)
 206 {
 207         struct platform_device *dev = (struct platform_device *)__dev;
 208
 209         tosakbd_scankeyboard(dev);
 210 }
 211
 212 #ifdef CONFIG_PM
 213 static int tosakbd_suspend(struct platform_device *dev, pm_message_t state)
 214 {
 215         struct tosakbd *tosakbd = platform_get_drvdata(dev);
 216         unsigned long flags;
 217
 218         spin_lock_irqsave(&tosakbd->lock, flags);
 219         tosakbd->suspended = true;
 220         spin_unlock_irqrestore(&tosakbd->lock, flags);
 221
 222         del_timer_sync(&tosakbd->timer);
 223
 224         return 0;
 225 }
 226
 227 static int tosakbd_resume(struct platform_device *dev)
 228 {
 229         struct tosakbd *tosakbd = platform_get_drvdata(dev);
 230
 231         tosakbd->suspended = false;
 232         tosakbd_scankeyboard(dev);
 233
 234         return 0;
 235 }
 236 #else
 237 #define tosakbd_suspend         NULL
 238 #define tosakbd_resume          NULL
 239 #endif
 240
 241 static int __devinit tosakbd_probe(struct platform_device *pdev) {
 242
 243         int i;
 244         struct tosakbd *tosakbd;
 245         struct input_dev *input_dev;
 246         int error;
 247
 248         tosakbd = kzalloc(sizeof(struct tosakbd), GFP_KERNEL);
 249         if (!tosakbd)
 250                 return -ENOMEM;
 251
 252         input_dev = input_allocate_device();
 253         if (!input_dev) {
 254                 kfree(tosakbd);
 255                 return -ENOMEM;
 256         }
 257
 258         platform_set_drvdata(pdev, tosakbd);
 259
 260         spin_lock_init(&tosakbd->lock);
 261
 262         /* Init Keyboard rescan timer */
 263         init_timer(&tosakbd->timer);
 264         tosakbd->timer.function = tosakbd_timer_callback;
 265         tosakbd->timer.data = (unsigned long) pdev;
 266
 267         tosakbd->input = input_dev;
 268
 269         input_set_drvdata(input_dev, tosakbd);
 270         input_dev->name = "Tosa Keyboard";
 271         input_dev->phys = "tosakbd/input0";
 272         input_dev->dev.parent = &pdev->dev;
 273
 274         input_dev->id.bustype = BUS_HOST;
 275         input_dev->id.vendor = 0x0001;
 276         input_dev->id.product = 0x0001;
 277         input_dev->id.version = 0x0100;
 278
 279         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
 280         input_dev->keycode = tosakbd->keycode;
 281         input_dev->keycodesize = sizeof(tosakbd->keycode[0]);
 282         input_dev->keycodemax = ARRAY_SIZE(tosakbd_keycode);
 283
 284         memcpy(tosakbd->keycode, tosakbd_keycode, sizeof(tosakbd_keycode));
 285
 286         for (i = 0; i < ARRAY_SIZE(tosakbd_keycode); i++)
 287                 __set_bit(tosakbd->keycode[i], input_dev->keybit);
 288         __clear_bit(KEY_RESERVED, input_dev->keybit);
 289
 290         /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 291         for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
 292                 int gpio = TOSA_GPIO_KEY_SENSE(i);
 293                 int irq;
 294                 error = gpio_request(gpio, "tosakbd");
 295                 if (error < 0) {
 296                         printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
 297                                 " error %d\n", gpio, error);
 298                         goto fail;
 299                 }
 300
 301                 error = gpio_direction_input(TOSA_GPIO_KEY_SENSE(i));
 302                 if (error < 0) {
 303                         printk(KERN_ERR "tosakbd: failed to configure input"
 304                                 " direction for GPIO %d, error %d\n",
 305                                 gpio, error);
 306                         gpio_free(gpio);
 307                         goto fail;
 308                 }
 309
 310                 irq = gpio_to_irq(gpio);
 311                 if (irq < 0) {
 312                         error = irq;
 313                         printk(KERN_ERR "gpio-keys: Unable to get irq number"
 314                                 " for GPIO %d, error %d\n",
 315                                 gpio, error);
 316                         gpio_free(gpio);
 317                         goto fail;
 318                 }
 319
 320                 error = request_irq(irq, tosakbd_interrupt,
 321                                         IRQF_DISABLED | IRQF_TRIGGER_RISING,
 322                                         "tosakbd", pdev);
 323
 324                 if (error) {
 325                         printk("tosakbd: Can't get IRQ: %d: error %d!\n",
 326                                         irq, error);
 327                         gpio_free(gpio);
 328                         goto fail;
 329                 }
 330         }
 331
 332         /* Set Strobe lines as outputs - set high */
 333         for (i = 0; i < TOSA_KEY_STROBE_NUM; i++) {
 334                 int gpio = TOSA_GPIO_KEY_STROBE(i);
 335                 error = gpio_request(gpio, "tosakbd");
 336                 if (error < 0) {
 337                         printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
 338                                 " error %d\n", gpio, error);
 339                         goto fail2;
 340                 }
 341
 342                 error = gpio_direction_output(gpio, 1);
 343                 if (error < 0) {
 344                         printk(KERN_ERR "tosakbd: failed to configure input"
 345                                 " direction for GPIO %d, error %d\n",
 346                                 gpio, error);
 347                         gpio_free(gpio);
 348                         goto fail2;
 349                 }
 350
 351         }
 352
 353         error = input_register_device(input_dev);
 354         if (error) {
 355                 printk(KERN_ERR "tosakbd: Unable to register input device, "
 356                         "error: %d\n", error);
 357                 goto fail2;
 358         }
 359
 360         printk(KERN_INFO "input: Tosa Keyboard Registered\n");
 361
 362         return 0;
 363
 364 fail2:
 365         while (--i >= 0)
 366                 gpio_free(TOSA_GPIO_KEY_STROBE(i));
 367
 368         i = TOSA_KEY_SENSE_NUM;
 369 fail:
 370         while (--i >= 0) {
 371                 free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), pdev);
 372                 gpio_free(TOSA_GPIO_KEY_SENSE(i));
 373         }
 374
 375         platform_set_drvdata(pdev, NULL);
 376         input_free_device(input_dev);
 377         kfree(tosakbd);
 378
 379         return error;
 380 }
 381
 382 static int __devexit tosakbd_remove(struct platform_device *dev)
 383 {
 384         int i;
 385         struct tosakbd *tosakbd = platform_get_drvdata(dev);
 386
 387         for (i = 0; i < TOSA_KEY_STROBE_NUM; i++)
 388                 gpio_free(TOSA_GPIO_KEY_STROBE(i));
 389
 390         for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
 391                 free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), dev);
 392                 gpio_free(TOSA_GPIO_KEY_SENSE(i));
 393         }
 394
 395         del_timer_sync(&tosakbd->timer);
 396
 397         input_unregister_device(tosakbd->input);
 398
 399         kfree(tosakbd);
 400
 401         return 0;
 402 }
 403
 404 static struct platform_driver tosakbd_driver = {
 405         .probe          = tosakbd_probe,
 406         .remove         = __devexit_p(tosakbd_remove),
 407         .suspend        = tosakbd_suspend,
 408         .resume         = tosakbd_resume,
 409         .driver         = {
 410                 .name   = "tosa-keyboard",
 411                 .owner  = THIS_MODULE,
 412         },
 413 };
 414
 415 static int __devinit tosakbd_init(void)
 416 {
 417         return platform_driver_register(&tosakbd_driver);
 418 }
 419
 420 static void __exit tosakbd_exit(void)
 421 {
 422         platform_driver_unregister(&tosakbd_driver);
 423 }
 424
 425 module_init(tosakbd_init);
 426 module_exit(tosakbd_exit);
 427
 428 MODULE_AUTHOR("Dirk Opfer <Dirk@Opfer-Online.de>");
 429 MODULE_DESCRIPTION("Tosa Keyboard Driver");
 430 MODULE_LICENSE("GPL v2");
 431 MODULE_ALIAS("platform:tosa-keyboard");