drivers/input/keyboard/stowaway.c

   1 /*
   2  * Stowaway keyboard driver for Linux
   3  */
   4
   5 /*
   6  *  Copyright (c) 2006 Marek Vasut
   7  *
   8  *  Based on Newton keyboard driver for Linux
   9  *  by Justin Cormack
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <marek.vasut@gmail.com>, or by paper mail:
  29  * Marek Vasut, Liskovecka 559, Frydek-Mistek, 738 01 Czech Republic
  30  */
  31
  32 #include <linux/slab.h>
  33 #include <linux/module.h>
  34 #include <linux/input.h>
  35 #include <linux/init.h>
  36 #include <linux/serio.h>
  37
  38 #define DRIVER_DESC     "Stowaway keyboard driver"
  39
  40 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
  41 MODULE_DESCRIPTION(DRIVER_DESC);
  42 MODULE_LICENSE("GPL");
  43
  44 #define SKBD_KEY_MASK   0x7f
  45 #define SKBD_RELEASE    0x80
  46
  47 static unsigned char skbd_keycode[128] = {
  48         KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
  49         0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
  50         KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
  51         KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
  52         0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
  53         0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
  54         KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
  55         KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
  56         KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
  57         KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
  58         KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
  59         KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
  60         0, 0, 0, 0, 0, 0, 0, 0,
  61         0, 0, 0, 0, 0, 0, 0, 0,
  62         0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
  63         KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
  64 };
  65
  66 struct skbd {
  67         unsigned char keycode[128];
  68         struct input_dev *dev;
  69         struct serio *serio;
  70         char phys[32];
  71 };
  72
  73 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
  74                                   unsigned int flags)
  75 {
  76         struct skbd *skbd = serio_get_drvdata(serio);
  77         struct input_dev *dev = skbd->dev;
  78
  79         if (skbd->keycode[data & SKBD_KEY_MASK]) {
  80                 input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
  81                                  !(data & SKBD_RELEASE));
  82                 input_sync(dev);
  83         }
  84
  85         return IRQ_HANDLED;
  86 }
  87
  88 static int skbd_connect(struct serio *serio, struct serio_driver *drv)
  89 {
  90         struct skbd *skbd;
  91         struct input_dev *input_dev;
  92         int err = -ENOMEM;
  93         int i;
  94
  95         skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
  96         input_dev = input_allocate_device();
  97         if (!skbd || !input_dev)
  98                 goto fail1;
  99
 100         skbd->serio = serio;
 101         skbd->dev = input_dev;
 102         snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
 103         memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
 104
 105         input_dev->name = "Stowaway Keyboard";
 106         input_dev->phys = skbd->phys;
 107         input_dev->id.bustype = BUS_RS232;
 108         input_dev->id.vendor = SERIO_STOWAWAY;
 109         input_dev->id.product = 0x0001;
 110         input_dev->id.version = 0x0100;
 111         input_dev->dev.parent = &serio->dev;
 112
 113         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
 114         input_dev->keycode = skbd->keycode;
 115         input_dev->keycodesize = sizeof(unsigned char);
 116         input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
 117         for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
 118                 set_bit(skbd_keycode[i], input_dev->keybit);
 119         clear_bit(0, input_dev->keybit);
 120
 121         serio_set_drvdata(serio, skbd);
 122
 123         err = serio_open(serio, drv);
 124         if (err)
 125                 goto fail2;
 126
 127         err = input_register_device(skbd->dev);
 128         if (err)
 129                 goto fail3;
 130
 131         return 0;
 132
 133  fail3: serio_close(serio);
 134  fail2: serio_set_drvdata(serio, NULL);
 135  fail1: input_free_device(input_dev);
 136         kfree(skbd);
 137         return err;
 138 }
 139
 140 static void skbd_disconnect(struct serio *serio)
 141 {
 142         struct skbd *skbd = serio_get_drvdata(serio);
 143
 144         serio_close(serio);
 145         serio_set_drvdata(serio, NULL);
 146         input_unregister_device(skbd->dev);
 147         kfree(skbd);
 148 }
 149
 150 static struct serio_device_id skbd_serio_ids[] = {
 151         {
 152                 .type   = SERIO_RS232,
 153                 .proto  = SERIO_STOWAWAY,
 154                 .id     = SERIO_ANY,
 155                 .extra  = SERIO_ANY,
 156         },
 157         { 0 }
 158 };
 159
 160 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
 161
 162 static struct serio_driver skbd_drv = {
 163         .driver         = {
 164                 .name   = "stowaway",
 165         },
 166         .description    = DRIVER_DESC,
 167         .id_table       = skbd_serio_ids,
 168         .interrupt      = skbd_interrupt,
 169         .connect        = skbd_connect,
 170         .disconnect     = skbd_disconnect,
 171 };
 172
 173 static int __init skbd_init(void)
 174 {
 175         return serio_register_driver(&skbd_drv);
 176 }
 177
 178 static void __exit skbd_exit(void)
 179 {
 180         serio_unregister_driver(&skbd_drv);
 181 }
 182
 183 module_init(skbd_init);
 184 module_exit(skbd_exit);