drivers/input/keyboard/locomokbd.c

   1 /*
   2  *  Copyright (c) 2005 John Lenz
   3  *
   4  * Based on from xtkbd.c
   5  */
   6
   7 /*
   8  * LoCoMo keyboard driver for Linux/ARM
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  */
  27
  28 #include <linux/config.h>
  29 #include <linux/slab.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/input.h>
  33 #include <linux/delay.h>
  34 #include <linux/device.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/ioport.h>
  37
  38 #include <asm/hardware/locomo.h>
  39 #include <asm/irq.h>
  40
  41 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
  42 MODULE_DESCRIPTION("LoCoMo keyboard driver");
  43 MODULE_LICENSE("GPL");
  44
  45 #define LOCOMOKBD_NUMKEYS       128
  46
  47 #define KEY_ACTIVITY            KEY_F16
  48 #define KEY_CONTACT             KEY_F18
  49 #define KEY_CENTER              KEY_F15
  50
  51 static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {
  52         0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0,                          /* 0 - 9 */
  53         0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT,                   /* 10 - 19 */
  54         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,                                           /* 20 - 29 */
  55         0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0,                           /* 30 - 39 */
  56         0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT,                                   /* 40 - 49 */
  57         KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T,           /* 50 - 59 */
  58         KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0,                    /* 60 - 69 */
  59         KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0,       /* 70 - 79 */
  60         0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J,              /* 80 - 89 */
  61         KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0,                           /* 90 - 99 */
  62         0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A,         /* 100 - 109 */
  63         KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0,              /* 110 - 119 */
  64         KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0             /* 120 - 128 */
  65 };
  66
  67 #define KB_ROWS                 16
  68 #define KB_COLS                 8
  69 #define KB_ROWMASK(r)           (1 << (r))
  70 #define SCANCODE(c,r)           ( ((c)<<4) + (r) + 1 )
  71 #define NR_SCANCODES            128
  72
  73 #define KB_DELAY                8
  74 #define SCAN_INTERVAL           (HZ/10)
  75 #define LOCOMOKBD_PRESSED       1
  76
  77 struct locomokbd {
  78         unsigned char keycode[LOCOMOKBD_NUMKEYS];
  79         struct input_dev input;
  80         char phys[32];
  81
  82         struct locomo_dev *ldev;
  83         unsigned long base;
  84         spinlock_t lock;
  85
  86         struct timer_list timer;
  87 };
  88
  89 /* helper functions for reading the keyboard matrix */
  90 static inline void locomokbd_charge_all(unsigned long membase)
  91 {
  92         locomo_writel(0x00FF, membase + LOCOMO_KSC);
  93 }
  94
  95 static inline void locomokbd_activate_all(unsigned long membase)
  96 {
  97         unsigned long r;
  98
  99         locomo_writel(0, membase + LOCOMO_KSC);
 100         r = locomo_readl(membase + LOCOMO_KIC);
 101         r &= 0xFEFF;
 102         locomo_writel(r, membase + LOCOMO_KIC);
 103 }
 104
 105 static inline void locomokbd_activate_col(unsigned long membase, int col)
 106 {
 107         unsigned short nset;
 108         unsigned short nbset;
 109
 110         nset = 0xFF & ~(1 << col);
 111         nbset = (nset << 8) + nset;
 112         locomo_writel(nbset, membase + LOCOMO_KSC);
 113 }
 114
 115 static inline void locomokbd_reset_col(unsigned long membase, int col)
 116 {
 117         unsigned short nbset;
 118
 119         nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
 120         locomo_writel(nbset, membase + LOCOMO_KSC);
 121 }
 122
 123 /*
 124  * The LoCoMo keyboard only generates interrupts when a key is pressed.
 125  * So when a key is pressed, we enable a timer.  This timer scans the
 126  * keyboard, and this is how we detect when the key is released.
 127  */
 128
 129 /* Scan the hardware keyboard and push any changes up through the input layer */
 130 static void locomokbd_scankeyboard(struct locomokbd *locomokbd, struct pt_regs *regs)
 131 {
 132         unsigned int row, col, rowd, scancode;
 133         unsigned long flags;
 134         unsigned int num_pressed;
 135         unsigned long membase = locomokbd->base;
 136
 137         spin_lock_irqsave(&locomokbd->lock, flags);
 138
 139         if (regs)
 140                 input_regs(&locomokbd->input, regs);
 141
 142         locomokbd_charge_all(membase);
 143
 144         num_pressed = 0;
 145         for (col = 0; col < KB_COLS; col++) {
 146
 147                 locomokbd_activate_col(membase, col);
 148                 udelay(KB_DELAY);
 149
 150                 rowd = ~locomo_readl(membase + LOCOMO_KIB);
 151                 for (row = 0; row < KB_ROWS; row++ ) {
 152                         scancode = SCANCODE(col, row);
 153                         if (rowd & KB_ROWMASK(row)) {
 154                                 num_pressed += 1;
 155                                 input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 1);
 156                         } else {
 157                                 input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 0);
 158                         }
 159                 }
 160                 locomokbd_reset_col(membase, col);
 161         }
 162         locomokbd_activate_all(membase);
 163
 164         input_sync(&locomokbd->input);
 165
 166         /* if any keys are pressed, enable the timer */
 167         if (num_pressed)
 168                 mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);
 169
 170         spin_unlock_irqrestore(&locomokbd->lock, flags);
 171 }
 172
 173 /*
 174  * LoCoMo keyboard interrupt handler.
 175  */
 176 static irqreturn_t locomokbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 177 {
 178         struct locomokbd *locomokbd = dev_id;
 179         /** wait chattering delay **/
 180         udelay(100);
 181
 182         locomokbd_scankeyboard(locomokbd, regs);
 183
 184         return IRQ_HANDLED;
 185 }
 186
 187 /*
 188  * LoCoMo timer checking for released keys
 189  */
 190 static void locomokbd_timer_callback(unsigned long data)
 191 {
 192         struct locomokbd *locomokbd = (struct locomokbd *) data;
 193         locomokbd_scankeyboard(locomokbd, NULL);
 194 }
 195
 196 static int locomokbd_probe(struct locomo_dev *dev)
 197 {
 198         struct locomokbd *locomokbd;
 199         int i, ret;
 200
 201         locomokbd = kmalloc(sizeof(struct locomokbd), GFP_KERNEL);
 202         if (!locomokbd)
 203                 return -ENOMEM;
 204
 205         memset(locomokbd, 0, sizeof(struct locomokbd));
 206
 207         /* try and claim memory region */
 208         if (!request_mem_region((unsigned long) dev->mapbase,
 209                                 dev->length,
 210                                 LOCOMO_DRIVER_NAME(dev))) {
 211                 ret = -EBUSY;
 212                 printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
 213                 goto free;
 214         }
 215
 216         locomokbd->ldev = dev;
 217         locomo_set_drvdata(dev, locomokbd);
 218
 219         locomokbd->base = (unsigned long) dev->mapbase;
 220
 221         spin_lock_init(&locomokbd->lock);
 222
 223         init_timer(&locomokbd->timer);
 224         locomokbd->timer.function = locomokbd_timer_callback;
 225         locomokbd->timer.data = (unsigned long) locomokbd;
 226
 227         locomokbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
 228
 229         init_input_dev(&locomokbd->input);
 230         locomokbd->input.keycode = locomokbd->keycode;
 231         locomokbd->input.keycodesize = sizeof(unsigned char);
 232         locomokbd->input.keycodemax = ARRAY_SIZE(locomokbd_keycode);
 233         locomokbd->input.private = locomokbd;
 234
 235         memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
 236         for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
 237                 set_bit(locomokbd->keycode[i], locomokbd->input.keybit);
 238         clear_bit(0, locomokbd->input.keybit);
 239
 240         strcpy(locomokbd->phys, "locomokbd/input0");
 241
 242         locomokbd->input.name = "LoCoMo keyboard";
 243         locomokbd->input.phys = locomokbd->phys;
 244         locomokbd->input.id.bustype = BUS_XTKBD;
 245         locomokbd->input.id.vendor = 0x0001;
 246         locomokbd->input.id.product = 0x0001;
 247         locomokbd->input.id.version = 0x0100;
 248
 249         /* attempt to get the interrupt */
 250         ret = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
 251         if (ret) {
 252                 printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
 253                 goto out;
 254         }
 255
 256         input_register_device(&locomokbd->input);
 257
 258         printk(KERN_INFO "input: LoCoMo keyboard on locomokbd\n");
 259
 260         return 0;
 261
 262 out:
 263         release_mem_region((unsigned long) dev->mapbase, dev->length);
 264         locomo_set_drvdata(dev, NULL);
 265 free:
 266         kfree(locomokbd);
 267
 268         return ret;
 269 }
 270
 271 static int locomokbd_remove(struct locomo_dev *dev)
 272 {
 273         struct locomokbd *locomokbd = locomo_get_drvdata(dev);
 274
 275         free_irq(dev->irq[0], locomokbd);
 276
 277         del_timer_sync(&locomokbd->timer);
 278
 279         input_unregister_device(&locomokbd->input);
 280         locomo_set_drvdata(dev, NULL);
 281
 282         release_mem_region((unsigned long) dev->mapbase, dev->length);
 283
 284         kfree(locomokbd);
 285
 286         return 0;
 287 }
 288
 289 static struct locomo_driver keyboard_driver = {
 290         .drv = {
 291                 .name = "locomokbd"
 292         },
 293         .devid  = LOCOMO_DEVID_KEYBOARD,
 294         .probe  = locomokbd_probe,
 295         .remove = locomokbd_remove,
 296 };
 297
 298 static int __init locomokbd_init(void)
 299 {
 300         return locomo_driver_register(&keyboard_driver);
 301 }
 302
 303 static void __exit locomokbd_exit(void)
 304 {
 305         locomo_driver_unregister(&keyboard_driver);
 306 }
 307
 308 module_init(locomokbd_init);
 309 module_exit(locomokbd_exit);