devkbin.c 1.8 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120
  1. /*
  2. * keyboard scan code input from outside the kernel.
  3. * to avoid duplication of keyboard map processing for usb.
  4. */
  5. #include "u.h"
  6. #include "../port/lib.h"
  7. #include "mem.h"
  8. #include "dat.h"
  9. #include "fns.h"
  10. #include "../port/error.h"
  11. extern void kbdputsc(int, int);
  12. enum {
  13. Qdir,
  14. Qkbd,
  15. };
  16. Dirtab kbintab[] = {
  17. ".", {Qdir, 0, QTDIR}, 0, 0555,
  18. "kbin", {Qkbd, 0}, 0, 0200,
  19. };
  20. Lock kbinlck;
  21. int kbinbusy;
  22. static Chan *
  23. kbinattach(char *spec)
  24. {
  25. return devattach(L'Ι', spec);
  26. }
  27. static Walkqid*
  28. kbinwalk(Chan *c, Chan *nc, char **name, int nname)
  29. {
  30. return devwalk(c, nc, name, nname, kbintab, nelem(kbintab), devgen);
  31. }
  32. static int
  33. kbinstat(Chan *c, uchar *dp, int n)
  34. {
  35. return devstat(c, dp, n, kbintab, nelem(kbintab), devgen);
  36. }
  37. static Chan*
  38. kbinopen(Chan *c, int omode)
  39. {
  40. if(!iseve())
  41. error(Eperm);
  42. if(c->qid.path == Qkbd){
  43. lock(&kbinlck);
  44. if(kbinbusy){
  45. unlock(&kbinlck);
  46. error(Einuse);
  47. }
  48. kbinbusy++;
  49. unlock(&kbinlck);
  50. }
  51. return devopen(c, omode, kbintab, nelem(kbintab), devgen);
  52. }
  53. static void
  54. kbinclose(Chan *c)
  55. {
  56. if(c->aux){
  57. free(c->aux);
  58. c->aux = nil;
  59. }
  60. if(c->qid.path == Qkbd)
  61. kbinbusy = 0;
  62. }
  63. static long
  64. kbinread(Chan *c, void *a, long n, vlong )
  65. {
  66. if(c->qid.type == QTDIR)
  67. return devdirread(c, a, n, kbintab, nelem(kbintab), devgen);
  68. return 0;
  69. }
  70. static long
  71. kbinwrite(Chan *c, void *a, long n, vlong)
  72. {
  73. int i;
  74. uchar *p = a;
  75. if(c->qid.type == QTDIR)
  76. error(Eisdir);
  77. switch((int)c->qid.path){
  78. case Qkbd:
  79. for(i = 0; i < n; i++)
  80. kbdputsc(*p++, 1); /* external source */
  81. break;
  82. default:
  83. error(Egreg);
  84. }
  85. return n;
  86. }
  87. Dev kbindevtab = {
  88. L'Ι',
  89. "kbin",
  90. devreset,
  91. devinit,
  92. devshutdown,
  93. kbinattach,
  94. kbinwalk,
  95. kbinstat,
  96. kbinopen,
  97. devcreate,
  98. kbinclose,
  99. kbinread,
  100. devbread,
  101. kbinwrite,
  102. devbwrite,
  103. devremove,
  104. devwstat,
  105. };