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annotate packages/services/gfx/mw/current/src/drivers/mou_null.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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1 /*
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2 * Copyright (c) 1999 Greg Haerr <greg@censoft.com>
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3 *
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4 * NULL Mouse Driver
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5 */
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6 #include <stdio.h>
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7 #include "device.h"
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8
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9 #define SCALE 3 /* default scaling factor for acceleration */
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10 #define THRESH 5 /* default threshhold for acceleration */
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11
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12 static int NUL_Open(MOUSEDEVICE *pmd);
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13 static void NUL_Close(void);
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14 static int NUL_GetButtonInfo(void);
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15 static void NUL_GetDefaultAccel(int *pscale,int *pthresh);
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16 static int NUL_Read(MWCOORD *dx, MWCOORD *dy, MWCOORD *dz, int *bp);
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17 static int NUL_Poll(void);
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18
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19 MOUSEDEVICE mousedev = {
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20 NUL_Open,
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21 NUL_Close,
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22 NUL_GetButtonInfo,
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23 NUL_GetDefaultAccel,
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24 NUL_Read,
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25 NUL_Poll
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26 };
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27
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28 /*
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29 * Poll for events
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30 */
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31
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32 static int
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33 NUL_Poll(void)
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34 {
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35 return 0;
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36 }
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37
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38 /*
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39 * Open up the mouse device.
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40 */
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41 static int
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42 NUL_Open(MOUSEDEVICE *pmd)
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43 {
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44 return -2; /* no mouse*/
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45 }
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46
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47 /*
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48 * Close the mouse device.
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49 */
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50 static void
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51 NUL_Close(void)
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52 {
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53 }
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54
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55 /*
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56 * Get mouse buttons supported
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57 */
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58 static int
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59 NUL_GetButtonInfo(void)
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60 {
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61 return 0;
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62 }
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63
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64 /*
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65 * Get default mouse acceleration settings
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66 */
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67 static void
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68 NUL_GetDefaultAccel(int *pscale,int *pthresh)
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69 {
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70 *pscale = SCALE;
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71 *pthresh = THRESH;
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72 }
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73
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74 /*
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75 * Attempt to read bytes from the mouse and interpret them.
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76 * Returns -1 on error, 0 if either no bytes were read or not enough
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77 * was read for a complete state, or 1 if the new state was read.
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78 * When a new state is read, the current buttons and x and y deltas
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79 * are returned. This routine does not block.
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80 */
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81 static int
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82 NUL_Read(MWCOORD *dx, MWCOORD *dy, MWCOORD *dz, int *bp)
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83 {
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84 return 0;
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85 }