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/serio.h>
  36
  37 #define DRIVER_DESC     "Stowaway keyboard driver"
  38
  39 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 #define SKBD_KEY_MASK   0x7f
  44 #define SKBD_RELEASE    0x80
  45
  46 static unsigned char skbd_keycode[128] = {
  47         KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
  48         0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
  49         KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
  50         KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
  51         0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
  52         0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
  53         KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
  54         KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
  55         KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
  56         KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
  57         KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
  58         KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
  59         0, 0, 0, 0, 0, 0, 0, 0,
  60         0, 0, 0, 0, 0, 0, 0, 0,
  61         0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
  62         KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
  63 };
  64
  65 struct skbd {
  66         unsigned char keycode[128];
  67         struct input_dev *dev;
  68         struct serio *serio;
  69         char phys[32];
  70 };
  71
  72 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
  73                                   unsigned int flags)
  74 {
  75         struct skbd *skbd = serio_get_drvdata(serio);
  76         struct input_dev *dev = skbd->dev;
  77
  78         if (skbd->keycode[data & SKBD_KEY_MASK]) {
  79                 input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
  80                                  !(data & SKBD_RELEASE));
  81                 input_sync(dev);
  82         }
  83
  84         return IRQ_HANDLED;
  85 }
  86
  87 static int skbd_connect(struct serio *serio, struct serio_driver *drv)
  88 {
  89         struct skbd *skbd;
  90         struct input_dev *input_dev;
  91         int err = -ENOMEM;
  92         int i;
  93
  94         skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
  95         input_dev = input_allocate_device();
  96         if (!skbd || !input_dev)
  97                 goto fail1;
  98
  99         skbd->serio = serio;
 100         skbd->dev = input_dev;
 101         snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
 102         memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
 103
 104         input_dev->name = "Stowaway Keyboard";
 105         input_dev->phys = skbd->phys;
 106         input_dev->id.bustype = BUS_RS232;
 107         input_dev->id.vendor = SERIO_STOWAWAY;
 108         input_dev->id.product = 0x0001;
 109         input_dev->id.version = 0x0100;
 110         input_dev->dev.parent = &serio->dev;
 111
 112         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 113         input_dev->keycode = skbd->keycode;
 114         input_dev->keycodesize = sizeof(unsigned char);
 115         input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
 116         for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
 117                 set_bit(skbd_keycode[i], input_dev->keybit);
 118         clear_bit(0, input_dev->keybit);
 119
 120         serio_set_drvdata(serio, skbd);
 121
 122         err = serio_open(serio, drv);
 123         if (err)
 124                 goto fail2;
 125
 126         err = input_register_device(skbd->dev);
 127         if (err)
 128                 goto fail3;
 129
 130         return 0;
 131
 132  fail3: serio_close(serio);
 133  fail2: serio_set_drvdata(serio, NULL);
 134  fail1: input_free_device(input_dev);
 135         kfree(skbd);
 136         return err;
 137 }
 138
 139 static void skbd_disconnect(struct serio *serio)
 140 {
 141         struct skbd *skbd = serio_get_drvdata(serio);
 142
 143         serio_close(serio);
 144         serio_set_drvdata(serio, NULL);
 145         input_unregister_device(skbd->dev);
 146         kfree(skbd);
 147 }
 148
 149 static struct serio_device_id skbd_serio_ids[] = {
 150         {
 151                 .type   = SERIO_RS232,
 152                 .proto  = SERIO_STOWAWAY,
 153                 .id     = SERIO_ANY,
 154                 .extra  = SERIO_ANY,
 155         },
 156         { 0 }
 157 };
 158
 159 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
 160
 161 static struct serio_driver skbd_drv = {
 162         .driver         = {
 163                 .name   = "stowaway",
 164         },
 165         .description    = DRIVER_DESC,
 166         .id_table       = skbd_serio_ids,
 167         .interrupt      = skbd_interrupt,
 168         .connect        = skbd_connect,
 169         .disconnect     = skbd_disconnect,
 170 };
 171
 172 module_serio_driver(skbd_drv);