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
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/input.h>
  31 #include <linux/serio.h>
  32
  33 #define DRIVER_DESC     "Stowaway keyboard driver"
  34
  35 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
  36 MODULE_DESCRIPTION(DRIVER_DESC);
  37 MODULE_LICENSE("GPL");
  38
  39 #define SKBD_KEY_MASK   0x7f
  40 #define SKBD_RELEASE    0x80
  41
  42 static unsigned char skbd_keycode[128] = {
  43         KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
  44         0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
  45         KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
  46         KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
  47         0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
  48         0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
  49         KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
  50         KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
  51         KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
  52         KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
  53         KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
  54         KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
  55         0, 0, 0, 0, 0, 0, 0, 0,
  56         0, 0, 0, 0, 0, 0, 0, 0,
  57         0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
  58         KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
  59 };
  60
  61 struct skbd {
  62         unsigned char keycode[128];
  63         struct input_dev *dev;
  64         struct serio *serio;
  65         char phys[32];
  66 };
  67
  68 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
  69                                   unsigned int flags)
  70 {
  71         struct skbd *skbd = serio_get_drvdata(serio);
  72         struct input_dev *dev = skbd->dev;
  73
  74         if (skbd->keycode[data & SKBD_KEY_MASK]) {
  75                 input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
  76                                  !(data & SKBD_RELEASE));
  77                 input_sync(dev);
  78         }
  79
  80         return IRQ_HANDLED;
  81 }
  82
  83 static int skbd_connect(struct serio *serio, struct serio_driver *drv)
  84 {
  85         struct skbd *skbd;
  86         struct input_dev *input_dev;
  87         int err = -ENOMEM;
  88         int i;
  89
  90         skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
  91         input_dev = input_allocate_device();
  92         if (!skbd || !input_dev)
  93                 goto fail1;
  94
  95         skbd->serio = serio;
  96         skbd->dev = input_dev;
  97         snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
  98         memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
  99
 100         input_dev->name = "Stowaway Keyboard";
 101         input_dev->phys = skbd->phys;
 102         input_dev->id.bustype = BUS_RS232;
 103         input_dev->id.vendor = SERIO_STOWAWAY;
 104         input_dev->id.product = 0x0001;
 105         input_dev->id.version = 0x0100;
 106         input_dev->dev.parent = &serio->dev;
 107
 108         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 109         input_dev->keycode = skbd->keycode;
 110         input_dev->keycodesize = sizeof(unsigned char);
 111         input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
 112         for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
 113                 set_bit(skbd_keycode[i], input_dev->keybit);
 114         clear_bit(0, input_dev->keybit);
 115
 116         serio_set_drvdata(serio, skbd);
 117
 118         err = serio_open(serio, drv);
 119         if (err)
 120                 goto fail2;
 121
 122         err = input_register_device(skbd->dev);
 123         if (err)
 124                 goto fail3;
 125
 126         return 0;
 127
 128  fail3: serio_close(serio);
 129  fail2: serio_set_drvdata(serio, NULL);
 130  fail1: input_free_device(input_dev);
 131         kfree(skbd);
 132         return err;
 133 }
 134
 135 static void skbd_disconnect(struct serio *serio)
 136 {
 137         struct skbd *skbd = serio_get_drvdata(serio);
 138
 139         serio_close(serio);
 140         serio_set_drvdata(serio, NULL);
 141         input_unregister_device(skbd->dev);
 142         kfree(skbd);
 143 }
 144
 145 static const struct serio_device_id skbd_serio_ids[] = {
 146         {
 147                 .type   = SERIO_RS232,
 148                 .proto  = SERIO_STOWAWAY,
 149                 .id     = SERIO_ANY,
 150                 .extra  = SERIO_ANY,
 151         },
 152         { 0 }
 153 };
 154
 155 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
 156
 157 static struct serio_driver skbd_drv = {
 158         .driver         = {
 159                 .name   = "stowaway",
 160         },
 161         .description    = DRIVER_DESC,
 162         .id_table       = skbd_serio_ids,
 163         .interrupt      = skbd_interrupt,
 164         .connect        = skbd_connect,
 165         .disconnect     = skbd_disconnect,
 166 };
 167
 168 module_serio_driver(skbd_drv);