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1 // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // hal\inc\hal.h |
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15 // |
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16 // WARNING: This file contains some APIs which are internal and are subject |
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17 // to change without notice. Such APIs should therefore not be used |
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18 // outside the Kernel and Hardware Services package. |
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19 // |
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20 |
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21 #ifndef __HAL_H__ |
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22 #define __HAL_H__ |
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23 |
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24 #include <e32def.h> |
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25 #include <hal_data.h> |
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26 #include <e32property.h> |
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27 |
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28 |
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29 |
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30 |
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31 /** |
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32 @publishedPartner |
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33 @released |
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34 |
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35 A set of static functions to get and set hardware attributes. |
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36 |
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37 @see HALData |
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38 */ |
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39 class HAL : public HALData |
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40 { |
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41 public: |
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42 |
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43 /** |
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44 Synonyms for the attribute properties |
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45 HALData::TAttributeProperty, and used in SEntry. |
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46 */ |
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47 enum TEntryProperty |
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48 { |
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49 /** |
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50 When set, means that an attribute is meaningful on this device. |
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51 */ |
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52 EEntryValid=0x1, |
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53 |
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54 |
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55 /** |
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56 When set, means that an attribute is modifiable. |
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57 */ |
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58 EEntryDynamic=0x2, |
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59 }; |
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60 |
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61 |
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62 /** |
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63 Defines an entry in the array that is returned in a call to HAL::GetAll(). |
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64 */ |
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65 struct SEntry |
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66 { |
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67 /** |
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68 The properties of the attribute. |
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69 |
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70 @see HAL::TEntryProperty |
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71 */ |
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72 TInt iProperties; |
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73 |
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74 /** |
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75 The attribute value. |
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76 |
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77 @see HALData::TAttribute |
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78 */ |
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79 TInt iValue; |
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80 }; |
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81 public: |
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82 /** |
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83 Gets the value of the specified HAL attribute. |
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84 |
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85 @param aAttribute The HAL attribute. |
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86 @param aValue On successful return, contains the attribute value. |
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87 Some attributes may accept aValue as an input as well, to select |
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88 one of several alternate values. See the documentation for the |
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89 individual HAL attributes for details of this. |
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90 |
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91 @return KErrNone, if successful; |
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92 KErrNotSupported, if the attribute is not defined in the list |
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93 of attributes, or is not meaningful for this device. |
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94 KErrArgument, if aValue was invalid (for attributes |
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95 which take an argument). |
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96 |
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97 @see HALData::TAttribute |
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98 @see HALData::TAttributeProperty |
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99 */ |
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100 IMPORT_C static TInt Get(TAttribute aAttribute, TInt& aValue); |
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101 |
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102 |
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103 /** |
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104 Sets the specified HAL attribute. |
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105 |
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106 @param aAttribute The HAL attribute. |
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107 @param aValue The attribute value. |
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108 |
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109 @return KErrNone, if successful; |
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110 KErrNotSupported, if the attribute is not defined in the list |
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111 of attributes, or is not meaningful for this device, or is |
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112 not settable. |
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113 |
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114 @see HALData::TAttribute |
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115 @see HALData::TAttributeProperty |
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116 |
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117 @capability WriteDeviceData or other capability specified |
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118 for individual attributes in TAttribute |
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119 */ |
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120 IMPORT_C static TInt Set(TAttribute aAttribute, TInt aValue); |
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121 |
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122 |
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123 /** |
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124 Gets all HAL attributes, and their properties. |
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125 |
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126 For attributes that are not meaningful on this device (ie. those which have |
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127 not been defined in the config.hcf file), |
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128 the attribute value and its associated property value are set to zero in |
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129 the returned array. |
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130 |
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131 Attributes for which multiple values can be retrieved |
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132 ie. EDisplayIsPalettized, EDisplayBitsPerPixel, EDisplayOffsetToFirstPixel, |
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133 EDisplayOffsetBetweenLines, and EDisplayPaletteEntry will also be zero in |
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134 the returned array. |
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135 |
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136 @param aNumEntries On successful return, contains the total number |
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137 of HAL attributes. |
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138 If the function returns KErrNoMemory, this value is set |
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139 to zero. |
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140 @param aData On successful return, contains a pointer to an array |
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141 of SEntry objects, each of which contains an attribute value |
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142 and its property value. Note that the property value is |
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143 defined by the HAL::TEntry synonym. |
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144 If the function returns KErrNoMemory, this pointer is set |
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145 to NULL. |
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146 |
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147 @return KErrNone, if succesful; |
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148 KErrNoMemory, if there is insufficient memory. |
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149 */ |
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150 IMPORT_C static TInt GetAll(TInt& aNumEntries, SEntry*& aData); |
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151 |
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152 |
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153 /** |
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154 Gets the value of the specified HAL attribute. |
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155 |
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156 @param aDeviceNumber The device number. (eg: screen number) |
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157 @param aAttribute The HAL attribute. |
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158 @param aValue On successful return, contains the attribute value. |
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159 Some attributes may accept aValue as an input as well, to select |
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160 one of several alternate values. See the documentation for the |
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161 individual HAL attributes for details of this. |
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162 |
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163 |
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164 @return KErrNone, if successful; |
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165 KErrNotSupported, if the attribute is not defined in the list |
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166 of attributes, or is not meaningful for this device. |
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167 KErrArgument, if aValue was invalid (for attributes |
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168 which take an argument). |
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169 |
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170 @see HALData::TAttribute |
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171 @see HALData::TAttributeProperty |
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172 */ |
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173 IMPORT_C static TInt Get(TInt aDeviceNumber, TAttribute aAttribute, TInt& aValue); |
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174 |
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175 |
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176 /** |
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177 Sets the specified HAL attribute. |
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178 |
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179 @param aDeviceNumber The device number. (eg: screen number) |
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180 @param aAttribute The HAL attribute. |
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181 @param aValue The attribute value. |
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182 |
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183 @return KErrNone, if successful; |
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184 KErrNotSupported, if the attribute is not defined in the list |
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185 of attributes, or is not meaningful for this device, or is |
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186 not settable. |
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187 |
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188 @see HALData::TAttribute |
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189 @see HALData::TAttributeProperty |
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190 |
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191 @capability WriteDeviceData or other capability specified |
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192 for individual attributes in TAttribute |
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193 */ |
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194 IMPORT_C static TInt Set(TInt aDeviceNumber, TAttribute aAttribute, TInt aValue); |
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195 }; |
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196 |
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197 |
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198 /** |
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199 @internalComponent |
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200 */ |
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201 static const TInt32 KUidHalPropertyKeyBase = 0x1020E306; |
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202 |
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203 __ASSERT_COMPILE(HAL::ENumHalAttributes<256); // only 256 UIDs allocated for HAL property keys |
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204 |
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205 |
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206 |
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207 #endif |