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