drivers/input/keyboard/newtonkbd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 2000 Justin Cormack
   4  */
   5
   6 /*
   7  * Newton keyboard driver for Linux
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/module.h>
  12 #include <linux/input.h>
  13 #include <linux/serio.h>
  14
  15 #define DRIVER_DESC     "Newton keyboard driver"
  16
  17 MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
  18 MODULE_DESCRIPTION(DRIVER_DESC);
  19 MODULE_LICENSE("GPL");
  20
  21 #define NKBD_KEY        0x7f
  22 #define NKBD_PRESS      0x80
  23
  24 static unsigned char nkbd_keycode[128] = {
  25         KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
  26         KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
  27         KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
  28         KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
  29         KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
  30         KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
  31         KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
  32         KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
  33         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  34         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  35         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  36         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  37         KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
  38 };
  39
  40 struct nkbd {
  41         unsigned char keycode[128];
  42         struct input_dev *dev;
  43         struct serio *serio;
  44         char phys[32];
  45 };
  46
  47 static irqreturn_t nkbd_interrupt(struct serio *serio,
  48                 unsigned char data, unsigned int flags)
  49 {
  50         struct nkbd *nkbd = serio_get_drvdata(serio);
  51
  52         /* invalid scan codes are probably the init sequence, so we ignore them */
  53         if (nkbd->keycode[data & NKBD_KEY]) {
  54                 input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
  55                 input_sync(nkbd->dev);
  56         }
  57
  58         else if (data == 0xe7) /* end of init sequence */
  59                 printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
  60         return IRQ_HANDLED;
  61
  62 }
  63
  64 static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
  65 {
  66         struct nkbd *nkbd;
  67         struct input_dev *input_dev;
  68         int err = -ENOMEM;
  69         int i;
  70
  71         nkbd = kzalloc(sizeof(*nkbd), GFP_KERNEL);
  72         input_dev = input_allocate_device();
  73         if (!nkbd || !input_dev)
  74                 goto fail1;
  75
  76         nkbd->serio = serio;
  77         nkbd->dev = input_dev;
  78         snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
  79         memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));
  80
  81         input_dev->name = "Newton Keyboard";
  82         input_dev->phys = nkbd->phys;
  83         input_dev->id.bustype = BUS_RS232;
  84         input_dev->id.vendor = SERIO_NEWTON;
  85         input_dev->id.product = 0x0001;
  86         input_dev->id.version = 0x0100;
  87         input_dev->dev.parent = &serio->dev;
  88
  89         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
  90         input_dev->keycode = nkbd->keycode;
  91         input_dev->keycodesize = sizeof(unsigned char);
  92         input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
  93         for (i = 0; i < 128; i++)
  94                 set_bit(nkbd->keycode[i], input_dev->keybit);
  95         clear_bit(0, input_dev->keybit);
  96
  97         serio_set_drvdata(serio, nkbd);
  98
  99         err = serio_open(serio, drv);
 100         if (err)
 101                 goto fail2;
 102
 103         err = input_register_device(nkbd->dev);
 104         if (err)
 105                 goto fail3;
 106
 107         return 0;
 108
 109  fail3: serio_close(serio);
 110  fail2: serio_set_drvdata(serio, NULL);
 111  fail1: input_free_device(input_dev);
 112         kfree(nkbd);
 113         return err;
 114 }
 115
 116 static void nkbd_disconnect(struct serio *serio)
 117 {
 118         struct nkbd *nkbd = serio_get_drvdata(serio);
 119
 120         serio_close(serio);
 121         serio_set_drvdata(serio, NULL);
 122         input_unregister_device(nkbd->dev);
 123         kfree(nkbd);
 124 }
 125
 126 static const struct serio_device_id nkbd_serio_ids[] = {
 127         {
 128                 .type   = SERIO_RS232,
 129                 .proto  = SERIO_NEWTON,
 130                 .id     = SERIO_ANY,
 131                 .extra  = SERIO_ANY,
 132         },
 133         { 0 }
 134 };
 135
 136 MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
 137
 138 static struct serio_driver nkbd_drv = {
 139         .driver         = {
 140                 .name   = "newtonkbd",
 141         },
 142         .description    = DRIVER_DESC,
 143         .id_table       = nkbd_serio_ids,
 144         .interrupt      = nkbd_interrupt,
 145         .connect        = nkbd_connect,
 146         .disconnect     = nkbd_disconnect,
 147 };
 148
 149 module_serio_driver(nkbd_drv);