turbografx.c 7.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (c) 1998-2001 Vojtech Pavlik
  4. *
  5. * Based on the work of:
  6. * Steffen Schwenke
  7. */
  8. /*
  9. * TurboGraFX parallel port interface driver for Linux.
  10. */
  11. /*
  12. */
  13. #include <linux/kernel.h>
  14. #include <linux/parport.h>
  15. #include <linux/input.h>
  16. #include <linux/module.h>
  17. #include <linux/init.h>
  18. #include <linux/mutex.h>
  19. #include <linux/slab.h>
  20. MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  21. MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
  22. MODULE_LICENSE("GPL");
  23. #define TGFX_MAX_PORTS 3
  24. #define TGFX_MAX_DEVICES 7
  25. struct tgfx_config {
  26. int args[TGFX_MAX_DEVICES + 1];
  27. unsigned int nargs;
  28. };
  29. static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS];
  30. module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
  31. MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
  32. module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
  33. MODULE_PARM_DESC(map2, "Describes second set of devices");
  34. module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
  35. MODULE_PARM_DESC(map3, "Describes third set of devices");
  36. #define TGFX_REFRESH_TIME HZ/100 /* 10 ms */
  37. #define TGFX_TRIGGER 0x08
  38. #define TGFX_UP 0x10
  39. #define TGFX_DOWN 0x20
  40. #define TGFX_LEFT 0x40
  41. #define TGFX_RIGHT 0x80
  42. #define TGFX_THUMB 0x02
  43. #define TGFX_THUMB2 0x04
  44. #define TGFX_TOP 0x01
  45. #define TGFX_TOP2 0x08
  46. static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };
  47. static struct tgfx {
  48. struct pardevice *pd;
  49. struct timer_list timer;
  50. struct input_dev *dev[TGFX_MAX_DEVICES];
  51. char name[TGFX_MAX_DEVICES][64];
  52. char phys[TGFX_MAX_DEVICES][32];
  53. int sticks;
  54. int used;
  55. int parportno;
  56. struct mutex sem;
  57. } *tgfx_base[TGFX_MAX_PORTS];
  58. /*
  59. * tgfx_timer() reads and analyzes TurboGraFX joystick data.
  60. */
  61. static void tgfx_timer(struct timer_list *t)
  62. {
  63. struct tgfx *tgfx = from_timer(tgfx, t, timer);
  64. struct input_dev *dev;
  65. int data1, data2, i;
  66. for (i = 0; i < 7; i++)
  67. if (tgfx->sticks & (1 << i)) {
  68. dev = tgfx->dev[i];
  69. parport_write_data(tgfx->pd->port, ~(1 << i));
  70. data1 = parport_read_status(tgfx->pd->port) ^ 0x7f;
  71. data2 = parport_read_control(tgfx->pd->port) ^ 0x04; /* CAVEAT parport */
  72. input_report_abs(dev, ABS_X, !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
  73. input_report_abs(dev, ABS_Y, !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP ));
  74. input_report_key(dev, BTN_TRIGGER, (data1 & TGFX_TRIGGER));
  75. input_report_key(dev, BTN_THUMB, (data2 & TGFX_THUMB ));
  76. input_report_key(dev, BTN_THUMB2, (data2 & TGFX_THUMB2 ));
  77. input_report_key(dev, BTN_TOP, (data2 & TGFX_TOP ));
  78. input_report_key(dev, BTN_TOP2, (data2 & TGFX_TOP2 ));
  79. input_sync(dev);
  80. }
  81. mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
  82. }
  83. static int tgfx_open(struct input_dev *dev)
  84. {
  85. struct tgfx *tgfx = input_get_drvdata(dev);
  86. int err;
  87. err = mutex_lock_interruptible(&tgfx->sem);
  88. if (err)
  89. return err;
  90. if (!tgfx->used++) {
  91. parport_claim(tgfx->pd);
  92. parport_write_control(tgfx->pd->port, 0x04);
  93. mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
  94. }
  95. mutex_unlock(&tgfx->sem);
  96. return 0;
  97. }
  98. static void tgfx_close(struct input_dev *dev)
  99. {
  100. struct tgfx *tgfx = input_get_drvdata(dev);
  101. mutex_lock(&tgfx->sem);
  102. if (!--tgfx->used) {
  103. del_timer_sync(&tgfx->timer);
  104. parport_write_control(tgfx->pd->port, 0x00);
  105. parport_release(tgfx->pd);
  106. }
  107. mutex_unlock(&tgfx->sem);
  108. }
  109. /*
  110. * tgfx_probe() probes for tg gamepads.
  111. */
  112. static void tgfx_attach(struct parport *pp)
  113. {
  114. struct tgfx *tgfx;
  115. struct input_dev *input_dev;
  116. struct pardevice *pd;
  117. int i, j, port_idx;
  118. int *n_buttons, n_devs;
  119. struct pardev_cb tgfx_parport_cb;
  120. for (port_idx = 0; port_idx < TGFX_MAX_PORTS; port_idx++) {
  121. if (tgfx_cfg[port_idx].nargs == 0 ||
  122. tgfx_cfg[port_idx].args[0] < 0)
  123. continue;
  124. if (tgfx_cfg[port_idx].args[0] == pp->number)
  125. break;
  126. }
  127. if (port_idx == TGFX_MAX_PORTS) {
  128. pr_debug("Not using parport%d.\n", pp->number);
  129. return;
  130. }
  131. n_buttons = tgfx_cfg[port_idx].args + 1;
  132. n_devs = tgfx_cfg[port_idx].nargs - 1;
  133. memset(&tgfx_parport_cb, 0, sizeof(tgfx_parport_cb));
  134. tgfx_parport_cb.flags = PARPORT_FLAG_EXCL;
  135. pd = parport_register_dev_model(pp, "turbografx", &tgfx_parport_cb,
  136. port_idx);
  137. if (!pd) {
  138. pr_err("parport busy already - lp.o loaded?\n");
  139. return;
  140. }
  141. tgfx = kzalloc(sizeof(struct tgfx), GFP_KERNEL);
  142. if (!tgfx) {
  143. printk(KERN_ERR "turbografx.c: Not enough memory\n");
  144. goto err_unreg_pardev;
  145. }
  146. mutex_init(&tgfx->sem);
  147. tgfx->pd = pd;
  148. tgfx->parportno = pp->number;
  149. timer_setup(&tgfx->timer, tgfx_timer, 0);
  150. for (i = 0; i < n_devs; i++) {
  151. if (n_buttons[i] < 1)
  152. continue;
  153. if (n_buttons[i] > ARRAY_SIZE(tgfx_buttons)) {
  154. printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
  155. goto err_unreg_devs;
  156. }
  157. tgfx->dev[i] = input_dev = input_allocate_device();
  158. if (!input_dev) {
  159. printk(KERN_ERR "turbografx.c: Not enough memory for input device\n");
  160. goto err_unreg_devs;
  161. }
  162. tgfx->sticks |= (1 << i);
  163. snprintf(tgfx->name[i], sizeof(tgfx->name[i]),
  164. "TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
  165. snprintf(tgfx->phys[i], sizeof(tgfx->phys[i]),
  166. "%s/input%d", tgfx->pd->port->name, i);
  167. input_dev->name = tgfx->name[i];
  168. input_dev->phys = tgfx->phys[i];
  169. input_dev->id.bustype = BUS_PARPORT;
  170. input_dev->id.vendor = 0x0003;
  171. input_dev->id.product = n_buttons[i];
  172. input_dev->id.version = 0x0100;
  173. input_set_drvdata(input_dev, tgfx);
  174. input_dev->open = tgfx_open;
  175. input_dev->close = tgfx_close;
  176. input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
  177. input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
  178. input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
  179. for (j = 0; j < n_buttons[i]; j++)
  180. set_bit(tgfx_buttons[j], input_dev->keybit);
  181. if (input_register_device(tgfx->dev[i]))
  182. goto err_free_dev;
  183. }
  184. if (!tgfx->sticks) {
  185. printk(KERN_ERR "turbografx.c: No valid devices specified\n");
  186. goto err_free_tgfx;
  187. }
  188. tgfx_base[port_idx] = tgfx;
  189. return;
  190. err_free_dev:
  191. input_free_device(tgfx->dev[i]);
  192. err_unreg_devs:
  193. while (--i >= 0)
  194. if (tgfx->dev[i])
  195. input_unregister_device(tgfx->dev[i]);
  196. err_free_tgfx:
  197. kfree(tgfx);
  198. err_unreg_pardev:
  199. parport_unregister_device(pd);
  200. }
  201. static void tgfx_detach(struct parport *port)
  202. {
  203. int i;
  204. struct tgfx *tgfx;
  205. for (i = 0; i < TGFX_MAX_PORTS; i++) {
  206. if (tgfx_base[i] && tgfx_base[i]->parportno == port->number)
  207. break;
  208. }
  209. if (i == TGFX_MAX_PORTS)
  210. return;
  211. tgfx = tgfx_base[i];
  212. tgfx_base[i] = NULL;
  213. for (i = 0; i < TGFX_MAX_DEVICES; i++)
  214. if (tgfx->dev[i])
  215. input_unregister_device(tgfx->dev[i]);
  216. parport_unregister_device(tgfx->pd);
  217. kfree(tgfx);
  218. }
  219. static struct parport_driver tgfx_parport_driver = {
  220. .name = "turbografx",
  221. .match_port = tgfx_attach,
  222. .detach = tgfx_detach,
  223. .devmodel = true,
  224. };
  225. static int __init tgfx_init(void)
  226. {
  227. int i;
  228. int have_dev = 0;
  229. for (i = 0; i < TGFX_MAX_PORTS; i++) {
  230. if (tgfx_cfg[i].nargs == 0 || tgfx_cfg[i].args[0] < 0)
  231. continue;
  232. if (tgfx_cfg[i].nargs < 2) {
  233. printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
  234. return -EINVAL;
  235. }
  236. have_dev = 1;
  237. }
  238. if (!have_dev)
  239. return -ENODEV;
  240. return parport_register_driver(&tgfx_parport_driver);
  241. }
  242. static void __exit tgfx_exit(void)
  243. {
  244. parport_unregister_driver(&tgfx_parport_driver);
  245. }
  246. module_init(tgfx_init);
  247. module_exit(tgfx_exit);