xtkbd.c 3.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (c) 1999-2001 Vojtech Pavlik
  4. */
  5. /*
  6. * XT keyboard driver for Linux
  7. */
  8. /*
  9. */
  10. #include <linux/slab.h>
  11. #include <linux/module.h>
  12. #include <linux/input.h>
  13. #include <linux/serio.h>
  14. #define DRIVER_DESC "XT keyboard driver"
  15. MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  16. MODULE_DESCRIPTION(DRIVER_DESC);
  17. MODULE_LICENSE("GPL");
  18. #define XTKBD_EMUL0 0xe0
  19. #define XTKBD_EMUL1 0xe1
  20. #define XTKBD_KEY 0x7f
  21. #define XTKBD_RELEASE 0x80
  22. static unsigned char xtkbd_keycode[256] = {
  23. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  24. 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  25. 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  26. 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
  27. 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
  28. 80, 81, 82, 83, 0, 0, 0, 87, 88, 0, 0, 0, 0, 0, 0, 0,
  29. 0, 0, 0, 0, 0, 87, 88, 0, 0, 0, 0,110,111,103,108,105,
  30. 106
  31. };
  32. struct xtkbd {
  33. unsigned char keycode[256];
  34. struct input_dev *dev;
  35. struct serio *serio;
  36. char phys[32];
  37. };
  38. static irqreturn_t xtkbd_interrupt(struct serio *serio,
  39. unsigned char data, unsigned int flags)
  40. {
  41. struct xtkbd *xtkbd = serio_get_drvdata(serio);
  42. switch (data) {
  43. case XTKBD_EMUL0:
  44. case XTKBD_EMUL1:
  45. break;
  46. default:
  47. if (xtkbd->keycode[data & XTKBD_KEY]) {
  48. input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE));
  49. input_sync(xtkbd->dev);
  50. } else {
  51. printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n",
  52. data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed");
  53. }
  54. }
  55. return IRQ_HANDLED;
  56. }
  57. static int xtkbd_connect(struct serio *serio, struct serio_driver *drv)
  58. {
  59. struct xtkbd *xtkbd;
  60. struct input_dev *input_dev;
  61. int err = -ENOMEM;
  62. int i;
  63. xtkbd = kmalloc(sizeof(struct xtkbd), GFP_KERNEL);
  64. input_dev = input_allocate_device();
  65. if (!xtkbd || !input_dev)
  66. goto fail1;
  67. xtkbd->serio = serio;
  68. xtkbd->dev = input_dev;
  69. snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys);
  70. memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode));
  71. input_dev->name = "XT Keyboard";
  72. input_dev->phys = xtkbd->phys;
  73. input_dev->id.bustype = BUS_XTKBD;
  74. input_dev->id.vendor = 0x0001;
  75. input_dev->id.product = 0x0001;
  76. input_dev->id.version = 0x0100;
  77. input_dev->dev.parent = &serio->dev;
  78. input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
  79. input_dev->keycode = xtkbd->keycode;
  80. input_dev->keycodesize = sizeof(unsigned char);
  81. input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode);
  82. for (i = 0; i < 255; i++)
  83. set_bit(xtkbd->keycode[i], input_dev->keybit);
  84. clear_bit(0, input_dev->keybit);
  85. serio_set_drvdata(serio, xtkbd);
  86. err = serio_open(serio, drv);
  87. if (err)
  88. goto fail2;
  89. err = input_register_device(xtkbd->dev);
  90. if (err)
  91. goto fail3;
  92. return 0;
  93. fail3: serio_close(serio);
  94. fail2: serio_set_drvdata(serio, NULL);
  95. fail1: input_free_device(input_dev);
  96. kfree(xtkbd);
  97. return err;
  98. }
  99. static void xtkbd_disconnect(struct serio *serio)
  100. {
  101. struct xtkbd *xtkbd = serio_get_drvdata(serio);
  102. serio_close(serio);
  103. serio_set_drvdata(serio, NULL);
  104. input_unregister_device(xtkbd->dev);
  105. kfree(xtkbd);
  106. }
  107. static const struct serio_device_id xtkbd_serio_ids[] = {
  108. {
  109. .type = SERIO_XT,
  110. .proto = SERIO_ANY,
  111. .id = SERIO_ANY,
  112. .extra = SERIO_ANY,
  113. },
  114. { 0 }
  115. };
  116. MODULE_DEVICE_TABLE(serio, xtkbd_serio_ids);
  117. static struct serio_driver xtkbd_drv = {
  118. .driver = {
  119. .name = "xtkbd",
  120. },
  121. .description = DRIVER_DESC,
  122. .id_table = xtkbd_serio_ids,
  123. .interrupt = xtkbd_interrupt,
  124. .connect = xtkbd_connect,
  125. .disconnect = xtkbd_disconnect,
  126. };
  127. module_serio_driver(xtkbd_drv);