stinger.c 4.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (c) 2000-2001 Vojtech Pavlik
  4. * Copyright (c) 2000 Mark Fletcher
  5. */
  6. /*
  7. * Gravis Stinger gamepad driver for Linux
  8. */
  9. /*
  10. */
  11. #include <linux/kernel.h>
  12. #include <linux/module.h>
  13. #include <linux/slab.h>
  14. #include <linux/input.h>
  15. #include <linux/serio.h>
  16. #define DRIVER_DESC "Gravis Stinger gamepad driver"
  17. MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  18. MODULE_DESCRIPTION(DRIVER_DESC);
  19. MODULE_LICENSE("GPL");
  20. /*
  21. * Constants.
  22. */
  23. #define STINGER_MAX_LENGTH 8
  24. /*
  25. * Per-Stinger data.
  26. */
  27. struct stinger {
  28. struct input_dev *dev;
  29. int idx;
  30. unsigned char data[STINGER_MAX_LENGTH];
  31. char phys[32];
  32. };
  33. /*
  34. * stinger_process_packet() decodes packets the driver receives from the
  35. * Stinger. It updates the data accordingly.
  36. */
  37. static void stinger_process_packet(struct stinger *stinger)
  38. {
  39. struct input_dev *dev = stinger->dev;
  40. unsigned char *data = stinger->data;
  41. if (!stinger->idx) return;
  42. input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5));
  43. input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4));
  44. input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3));
  45. input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2));
  46. input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5));
  47. input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4));
  48. input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3));
  49. input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2));
  50. input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  51. input_report_key(dev, BTN_START, (data[3] & 0x01));
  52. input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  53. input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  54. input_sync(dev);
  55. return;
  56. }
  57. /*
  58. * stinger_interrupt() is called by the low level driver when characters
  59. * are ready for us. We then buffer them for further processing, or call the
  60. * packet processing routine.
  61. */
  62. static irqreturn_t stinger_interrupt(struct serio *serio,
  63. unsigned char data, unsigned int flags)
  64. {
  65. struct stinger *stinger = serio_get_drvdata(serio);
  66. /* All Stinger packets are 4 bytes */
  67. if (stinger->idx < STINGER_MAX_LENGTH)
  68. stinger->data[stinger->idx++] = data;
  69. if (stinger->idx == 4) {
  70. stinger_process_packet(stinger);
  71. stinger->idx = 0;
  72. }
  73. return IRQ_HANDLED;
  74. }
  75. /*
  76. * stinger_disconnect() is the opposite of stinger_connect()
  77. */
  78. static void stinger_disconnect(struct serio *serio)
  79. {
  80. struct stinger *stinger = serio_get_drvdata(serio);
  81. serio_close(serio);
  82. serio_set_drvdata(serio, NULL);
  83. input_unregister_device(stinger->dev);
  84. kfree(stinger);
  85. }
  86. /*
  87. * stinger_connect() is the routine that is called when someone adds a
  88. * new serio device that supports Stinger protocol and registers it as
  89. * an input device.
  90. */
  91. static int stinger_connect(struct serio *serio, struct serio_driver *drv)
  92. {
  93. struct stinger *stinger;
  94. struct input_dev *input_dev;
  95. int err = -ENOMEM;
  96. stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
  97. input_dev = input_allocate_device();
  98. if (!stinger || !input_dev)
  99. goto fail1;
  100. stinger->dev = input_dev;
  101. snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
  102. input_dev->name = "Gravis Stinger";
  103. input_dev->phys = stinger->phys;
  104. input_dev->id.bustype = BUS_RS232;
  105. input_dev->id.vendor = SERIO_STINGER;
  106. input_dev->id.product = 0x0001;
  107. input_dev->id.version = 0x0100;
  108. input_dev->dev.parent = &serio->dev;
  109. input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
  110. input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
  111. BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
  112. BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
  113. BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
  114. input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
  115. input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
  116. serio_set_drvdata(serio, stinger);
  117. err = serio_open(serio, drv);
  118. if (err)
  119. goto fail2;
  120. err = input_register_device(stinger->dev);
  121. if (err)
  122. goto fail3;
  123. return 0;
  124. fail3: serio_close(serio);
  125. fail2: serio_set_drvdata(serio, NULL);
  126. fail1: input_free_device(input_dev);
  127. kfree(stinger);
  128. return err;
  129. }
  130. /*
  131. * The serio driver structure.
  132. */
  133. static const struct serio_device_id stinger_serio_ids[] = {
  134. {
  135. .type = SERIO_RS232,
  136. .proto = SERIO_STINGER,
  137. .id = SERIO_ANY,
  138. .extra = SERIO_ANY,
  139. },
  140. { 0 }
  141. };
  142. MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
  143. static struct serio_driver stinger_drv = {
  144. .driver = {
  145. .name = "stinger",
  146. },
  147. .description = DRIVER_DESC,
  148. .id_table = stinger_serio_ids,
  149. .interrupt = stinger_interrupt,
  150. .connect = stinger_connect,
  151. .disconnect = stinger_disconnect,
  152. };
  153. module_serio_driver(stinger_drv);