drivers/input/keyboard/stowaway.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Stowaway keyboard driver for Linux
   4  */
   5
   6 /*
   7  *  Copyright (c) 2006 Marek Vasut
   8  *
   9  *  Based on Newton keyboard driver for Linux
  10  *  by Justin Cormack
  11  */
  12
  13 /*
  14  */
  15
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/input.h>
  19 #include <linux/serio.h>
  20
  21 #define DRIVER_DESC     "Stowaway keyboard driver"
  22
  23 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
  24 MODULE_DESCRIPTION(DRIVER_DESC);
  25 MODULE_LICENSE("GPL");
  26
  27 #define SKBD_KEY_MASK   0x7f
  28 #define SKBD_RELEASE    0x80
  29
  30 static unsigned char skbd_keycode[128] = {
  31         KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7,
  32         0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE,
  33         KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE,
  34         KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0,
  35         0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0,
  36         0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N,
  37         KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC,
  38         KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P,
  39         KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON,
  40         KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT,
  41         KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT,  0, 0, 0,
  42         KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0,
  43         0, 0, 0, 0, 0, 0, 0, 0,
  44         0, 0, 0, 0, 0, 0, 0, 0,
  45         0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,
  46         KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0
  47 };
  48
  49 struct skbd {
  50         unsigned char keycode[128];
  51         struct input_dev *dev;
  52         struct serio *serio;
  53         char phys[32];
  54 };
  55
  56 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
  57                                   unsigned int flags)
  58 {
  59         struct skbd *skbd = serio_get_drvdata(serio);
  60         struct input_dev *dev = skbd->dev;
  61
  62         if (skbd->keycode[data & SKBD_KEY_MASK]) {
  63                 input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
  64                                  !(data & SKBD_RELEASE));
  65                 input_sync(dev);
  66         }
  67
  68         return IRQ_HANDLED;
  69 }
  70
  71 static int skbd_connect(struct serio *serio, struct serio_driver *drv)
  72 {
  73         struct skbd *skbd;
  74         struct input_dev *input_dev;
  75         int err = -ENOMEM;
  76         int i;
  77
  78         skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL);
  79         input_dev = input_allocate_device();
  80         if (!skbd || !input_dev)
  81                 goto fail1;
  82
  83         skbd->serio = serio;
  84         skbd->dev = input_dev;
  85         snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys);
  86         memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode));
  87
  88         input_dev->name = "Stowaway Keyboard";
  89         input_dev->phys = skbd->phys;
  90         input_dev->id.bustype = BUS_RS232;
  91         input_dev->id.vendor = SERIO_STOWAWAY;
  92         input_dev->id.product = 0x0001;
  93         input_dev->id.version = 0x0100;
  94         input_dev->dev.parent = &serio->dev;
  95
  96         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
  97         input_dev->keycode = skbd->keycode;
  98         input_dev->keycodesize = sizeof(unsigned char);
  99         input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
 100         for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
 101                 set_bit(skbd_keycode[i], input_dev->keybit);
 102         clear_bit(0, input_dev->keybit);
 103
 104         serio_set_drvdata(serio, skbd);
 105
 106         err = serio_open(serio, drv);
 107         if (err)
 108                 goto fail2;
 109
 110         err = input_register_device(skbd->dev);
 111         if (err)
 112                 goto fail3;
 113
 114         return 0;
 115
 116  fail3: serio_close(serio);
 117  fail2: serio_set_drvdata(serio, NULL);
 118  fail1: input_free_device(input_dev);
 119         kfree(skbd);
 120         return err;
 121 }
 122
 123 static void skbd_disconnect(struct serio *serio)
 124 {
 125         struct skbd *skbd = serio_get_drvdata(serio);
 126
 127         serio_close(serio);
 128         serio_set_drvdata(serio, NULL);
 129         input_unregister_device(skbd->dev);
 130         kfree(skbd);
 131 }
 132
 133 static const struct serio_device_id skbd_serio_ids[] = {
 134         {
 135                 .type   = SERIO_RS232,
 136                 .proto  = SERIO_STOWAWAY,
 137                 .id     = SERIO_ANY,
 138                 .extra  = SERIO_ANY,
 139         },
 140         { 0 }
 141 };
 142
 143 MODULE_DEVICE_TABLE(serio, skbd_serio_ids);
 144
 145 static struct serio_driver skbd_drv = {
 146         .driver         = {
 147                 .name   = "stowaway",
 148         },
 149         .description    = DRIVER_DESC,
 150         .id_table       = skbd_serio_ids,
 151         .interrupt      = skbd_interrupt,
 152         .connect        = skbd_connect,
 153         .disconnect     = skbd_disconnect,
 154 };
 155
 156 module_serio_driver(skbd_drv);