drivers/input/keyboard/locomokbd.c

   1 /*
   2  * LoCoMo keyboard driver for Linux-based ARM PDAs:
   3  *      - SHARP Zaurus Collie (SL-5500)
   4  *      - SHARP Zaurus Poodle (SL-5600)
   5  *
   6  * Copyright (c) 2005 John Lenz
   7  * Based on from xtkbd.c
   8  *
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  */
  25
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/input.h>
  30 #include <linux/delay.h>
  31 #include <linux/device.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/ioport.h>
  34
  35 #include <asm/hardware/locomo.h>
  36 #include <asm/irq.h>
  37
  38 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
  39 MODULE_DESCRIPTION("LoCoMo keyboard driver");
  40 MODULE_LICENSE("GPL");
  41
  42 #define LOCOMOKBD_NUMKEYS       128
  43
  44 #define KEY_ACTIVITY            KEY_F16
  45 #define KEY_CONTACT             KEY_F18
  46 #define KEY_CENTER              KEY_F15
  47
  48 static const unsigned char
  49 locomokbd_keycode[LOCOMOKBD_NUMKEYS] __devinitconst = {
  50         0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0,                          /* 0 - 9 */
  51         0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT,                   /* 10 - 19 */
  52         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,                                           /* 20 - 29 */
  53         0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0,                           /* 30 - 39 */
  54         0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT,                                   /* 40 - 49 */
  55         KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T,           /* 50 - 59 */
  56         KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0,                    /* 60 - 69 */
  57         KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0,       /* 70 - 79 */
  58         0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J,              /* 80 - 89 */
  59         KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0,                           /* 90 - 99 */
  60         0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A,         /* 100 - 109 */
  61         KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0,              /* 110 - 119 */
  62         KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0             /* 120 - 128 */
  63 };
  64
  65 #define KB_ROWS                 16
  66 #define KB_COLS                 8
  67 #define KB_ROWMASK(r)           (1 << (r))
  68 #define SCANCODE(c,r)           ( ((c)<<4) + (r) + 1 )
  69
  70 #define KB_DELAY                8
  71 #define SCAN_INTERVAL           (HZ/10)
  72
  73 struct locomokbd {
  74         unsigned char keycode[LOCOMOKBD_NUMKEYS];
  75         struct input_dev *input;
  76         char phys[32];
  77
  78         unsigned long base;
  79         spinlock_t lock;
  80
  81         struct timer_list timer;
  82         unsigned long suspend_jiffies;
  83         unsigned int count_cancel;
  84 };
  85
  86 /* helper functions for reading the keyboard matrix */
  87 static inline void locomokbd_charge_all(unsigned long membase)
  88 {
  89         locomo_writel(0x00FF, membase + LOCOMO_KSC);
  90 }
  91
  92 static inline void locomokbd_activate_all(unsigned long membase)
  93 {
  94         unsigned long r;
  95
  96         locomo_writel(0, membase + LOCOMO_KSC);
  97         r = locomo_readl(membase + LOCOMO_KIC);
  98         r &= 0xFEFF;
  99         locomo_writel(r, membase + LOCOMO_KIC);
 100 }
 101
 102 static inline void locomokbd_activate_col(unsigned long membase, int col)
 103 {
 104         unsigned short nset;
 105         unsigned short nbset;
 106
 107         nset = 0xFF & ~(1 << col);
 108         nbset = (nset << 8) + nset;
 109         locomo_writel(nbset, membase + LOCOMO_KSC);
 110 }
 111
 112 static inline void locomokbd_reset_col(unsigned long membase, int col)
 113 {
 114         unsigned short nbset;
 115
 116         nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
 117         locomo_writel(nbset, membase + LOCOMO_KSC);
 118 }
 119
 120 /*
 121  * The LoCoMo 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 locomokbd_scankeyboard(struct locomokbd *locomokbd)
 128 {
 129         unsigned int row, col, rowd;
 130         unsigned long flags;
 131         unsigned int num_pressed;
 132         unsigned long membase = locomokbd->base;
 133
 134         spin_lock_irqsave(&locomokbd->lock, flags);
 135
 136         locomokbd_charge_all(membase);
 137
 138         num_pressed = 0;
 139         for (col = 0; col < KB_COLS; col++) {
 140
 141                 locomokbd_activate_col(membase, col);
 142                 udelay(KB_DELAY);
 143
 144                 rowd = ~locomo_readl(membase + LOCOMO_KIB);
 145                 for (row = 0; row < KB_ROWS; row++) {
 146                         unsigned int scancode, pressed, key;
 147
 148                         scancode = SCANCODE(col, row);
 149                         pressed = rowd & KB_ROWMASK(row);
 150                         key = locomokbd->keycode[scancode];
 151
 152                         input_report_key(locomokbd->input, key, pressed);
 153                         if (likely(!pressed))
 154                                 continue;
 155
 156                         num_pressed++;
 157
 158                         /* The "Cancel/ESC" key is labeled "On/Off" on
 159                          * Collie and Poodle and should suspend the device
 160                          * if it was pressed for more than a second. */
 161                         if (unlikely(key == KEY_ESC)) {
 162                                 if (!time_after(jiffies,
 163                                         locomokbd->suspend_jiffies + HZ))
 164                                         continue;
 165                                 if (locomokbd->count_cancel++
 166                                         != (HZ/SCAN_INTERVAL + 1))
 167                                         continue;
 168                                 input_event(locomokbd->input, EV_PWR,
 169                                         KEY_SUSPEND, 1);
 170                                 locomokbd->suspend_jiffies = jiffies;
 171                         } else
 172                                 locomokbd->count_cancel = 0;
 173                 }
 174                 locomokbd_reset_col(membase, col);
 175         }
 176         locomokbd_activate_all(membase);
 177
 178         input_sync(locomokbd->input);
 179
 180         /* if any keys are pressed, enable the timer */
 181         if (num_pressed)
 182                 mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);
 183         else
 184                 locomokbd->count_cancel = 0;
 185
 186         spin_unlock_irqrestore(&locomokbd->lock, flags);
 187 }
 188
 189 /*
 190  * LoCoMo keyboard interrupt handler.
 191  */
 192 static irqreturn_t locomokbd_interrupt(int irq, void *dev_id)
 193 {
 194         struct locomokbd *locomokbd = dev_id;
 195         /** wait chattering delay **/
 196         udelay(100);
 197
 198         locomokbd_scankeyboard(locomokbd);
 199
 200         return IRQ_HANDLED;
 201 }
 202
 203 /*
 204  * LoCoMo timer checking for released keys
 205  */
 206 static void locomokbd_timer_callback(unsigned long data)
 207 {
 208         struct locomokbd *locomokbd = (struct locomokbd *) data;
 209
 210         locomokbd_scankeyboard(locomokbd);
 211 }
 212
 213 static int __devinit locomokbd_probe(struct locomo_dev *dev)
 214 {
 215         struct locomokbd *locomokbd;
 216         struct input_dev *input_dev;
 217         int i, err;
 218
 219         locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL);
 220         input_dev = input_allocate_device();
 221         if (!locomokbd || !input_dev) {
 222                 err = -ENOMEM;
 223                 goto err_free_mem;
 224         }
 225
 226         /* try and claim memory region */
 227         if (!request_mem_region((unsigned long) dev->mapbase,
 228                                 dev->length,
 229                                 LOCOMO_DRIVER_NAME(dev))) {
 230                 err = -EBUSY;
 231                 printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
 232                 goto err_free_mem;
 233         }
 234
 235         locomo_set_drvdata(dev, locomokbd);
 236
 237         locomokbd->base = (unsigned long) dev->mapbase;
 238
 239         spin_lock_init(&locomokbd->lock);
 240
 241         init_timer(&locomokbd->timer);
 242         locomokbd->timer.function = locomokbd_timer_callback;
 243         locomokbd->timer.data = (unsigned long) locomokbd;
 244
 245         locomokbd->suspend_jiffies = jiffies;
 246
 247         locomokbd->input = input_dev;
 248         strcpy(locomokbd->phys, "locomokbd/input0");
 249
 250         input_dev->name = "LoCoMo keyboard";
 251         input_dev->phys = locomokbd->phys;
 252         input_dev->id.bustype = BUS_HOST;
 253         input_dev->id.vendor = 0x0001;
 254         input_dev->id.product = 0x0001;
 255         input_dev->id.version = 0x0100;
 256         input_dev->dev.parent = &dev->dev;
 257
 258         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
 259                                 BIT_MASK(EV_PWR);
 260         input_dev->keycode = locomokbd->keycode;
 261         input_dev->keycodesize = sizeof(locomokbd_keycode[0]);
 262         input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode);
 263
 264         memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
 265         for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
 266                 set_bit(locomokbd->keycode[i], input_dev->keybit);
 267         clear_bit(0, input_dev->keybit);
 268
 269         /* attempt to get the interrupt */
 270         err = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
 271         if (err) {
 272                 printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
 273                 goto err_release_region;
 274         }
 275
 276         err = input_register_device(locomokbd->input);
 277         if (err)
 278                 goto err_free_irq;
 279
 280         return 0;
 281
 282  err_free_irq:
 283         free_irq(dev->irq[0], locomokbd);
 284  err_release_region:
 285         release_mem_region((unsigned long) dev->mapbase, dev->length);
 286         locomo_set_drvdata(dev, NULL);
 287  err_free_mem:
 288         input_free_device(input_dev);
 289         kfree(locomokbd);
 290
 291         return err;
 292 }
 293
 294 static int __devexit locomokbd_remove(struct locomo_dev *dev)
 295 {
 296         struct locomokbd *locomokbd = locomo_get_drvdata(dev);
 297
 298         free_irq(dev->irq[0], locomokbd);
 299
 300         del_timer_sync(&locomokbd->timer);
 301
 302         input_unregister_device(locomokbd->input);
 303         locomo_set_drvdata(dev, NULL);
 304
 305         release_mem_region((unsigned long) dev->mapbase, dev->length);
 306
 307         kfree(locomokbd);
 308
 309         return 0;
 310 }
 311
 312 static struct locomo_driver keyboard_driver = {
 313         .drv = {
 314                 .name = "locomokbd"
 315         },
 316         .devid  = LOCOMO_DEVID_KEYBOARD,
 317         .probe  = locomokbd_probe,
 318         .remove = __devexit_p(locomokbd_remove),
 319 };
 320
 321 static int __init locomokbd_init(void)
 322 {
 323         return locomo_driver_register(&keyboard_driver);
 324 }
 325
 326 static void __exit locomokbd_exit(void)
 327 {
 328         locomo_driver_unregister(&keyboard_driver);
 329 }
 330
 331 module_init(locomokbd_init);
 332 module_exit(locomokbd_exit);