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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 "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.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 // |
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17 |
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18 #ifndef __HAL_H__ |
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19 #define __HAL_H__ |
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20 |
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21 #include <e32def.h> |
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22 #include <hal_data.h> |
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23 #include <e32property.h> |
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24 |
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25 |
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26 |
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27 |
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28 /** |
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29 @publishedPartner |
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30 @released |
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31 |
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32 A set of static functions to get and set hardware attributes. |
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33 |
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34 @see HALData |
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35 */ |
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36 class HAL : public HALData |
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37 { |
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38 public: |
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39 |
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40 /** |
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41 Synonyms for the attribute properties |
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42 HALData::TAttributeProperty, and used in SEntry. |
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43 */ |
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44 enum TEntryProperty |
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45 { |
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46 /** |
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47 When set, means that an attribute is meaningful on this device. |
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48 */ |
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49 EEntryValid=0x1, |
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50 |
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51 |
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52 /** |
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53 When set, means that an attribute is modifiable. |
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54 */ |
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55 EEntryDynamic=0x2, |
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56 }; |
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57 |
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58 |
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59 /** |
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60 Defines an entry in the array that is returned in a call to HAL::GetAll(). |
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61 */ |
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62 struct SEntry |
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63 { |
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64 /** |
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65 The properties of the attribute. |
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66 |
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67 @see HAL::TEntryProperty |
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68 */ |
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69 TInt iProperties; |
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70 |
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71 /** |
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72 The attribute value. |
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73 |
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74 @see HALData::TAttribute |
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75 */ |
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76 TInt iValue; |
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77 }; |
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78 public: |
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79 /** |
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80 Gets the value of the specified HAL attribute. |
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81 |
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82 @param aAttribute The HAL attribute. |
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83 @param aValue On successful return, contains the attribute value. |
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84 Some attributes may accept aValue as an input as well, to select |
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85 one of several alternate values. See the documentation for the |
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86 individual HAL attributes for details of this. |
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87 |
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88 @return KErrNone, if successful; |
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89 KErrNotSupported, if the attribute is not defined in the list |
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90 of attributes, or is not meaningful for this device. |
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91 KErrArgument, if aValue was invalid (for attributes |
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92 which take an argument). |
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93 |
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94 @see HALData::TAttribute |
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95 @see HALData::TAttributeProperty |
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96 */ |
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97 IMPORT_C static TInt Get(TAttribute aAttribute, TInt& aValue); |
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98 |
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99 |
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100 /** |
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101 Sets the specified HAL attribute. |
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102 |
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103 @param aAttribute The HAL attribute. |
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104 @param aValue The attribute value. |
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105 |
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106 @return KErrNone, if successful; |
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107 KErrNotSupported, if the attribute is not defined in the list |
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108 of attributes, or is not meaningful for this device, or is |
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109 not settable. |
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110 |
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111 @see HALData::TAttribute |
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112 @see HALData::TAttributeProperty |
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113 |
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114 @capability WriteDeviceData or other capability specified |
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115 for individual attributes in TAttribute |
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116 */ |
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117 IMPORT_C static TInt Set(TAttribute aAttribute, TInt aValue); |
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118 |
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119 |
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120 /** |
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121 Gets all HAL attributes, and their properties. |
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122 |
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123 For attributes that are not meaningful on this device (ie. those which have |
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124 not been defined in the config.hcf file), |
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125 the attribute value and its associated property value are set to zero in |
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126 the returned array. |
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127 |
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128 Attributes for which multiple values can be retrieved |
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129 ie. EDisplayIsPalettized, EDisplayBitsPerPixel, EDisplayOffsetToFirstPixel, |
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130 EDisplayOffsetBetweenLines, and EDisplayPaletteEntry will also be zero in |
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131 the returned array. |
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132 |
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133 @param aNumEntries On successful return, contains the total number |
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134 of HAL attributes. |
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135 If the function returns KErrNoMemory, this value is set |
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136 to zero. |
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137 @param aData On successful return, contains a pointer to an array |
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138 of SEntry objects, each of which contains an attribute value |
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139 and its property value. Note that the property value is |
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140 defined by the HAL::TEntry synonym. |
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141 If the function returns KErrNoMemory, this pointer is set |
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142 to NULL. |
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143 |
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144 @return KErrNone, if succesful; |
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145 KErrNoMemory, if there is insufficient memory. |
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146 */ |
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147 IMPORT_C static TInt GetAll(TInt& aNumEntries, SEntry*& aData); |
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148 |
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149 |
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150 /** |
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151 Gets the value of the specified HAL attribute. |
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152 |
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153 @param aDeviceNumber The device number. (eg: screen number) |
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154 @param aAttribute The HAL attribute. |
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155 @param aValue On successful return, contains the attribute value. |
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156 Some attributes may accept aValue as an input as well, to select |
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157 one of several alternate values. See the documentation for the |
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158 individual HAL attributes for details of this. |
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159 |
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160 |
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161 @return KErrNone, if successful; |
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162 KErrNotSupported, if the attribute is not defined in the list |
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163 of attributes, or is not meaningful for this device. |
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164 KErrArgument, if aValue was invalid (for attributes |
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165 which take an argument). |
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166 |
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167 @see HALData::TAttribute |
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168 @see HALData::TAttributeProperty |
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169 */ |
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170 IMPORT_C static TInt Get(TInt aDeviceNumber, TAttribute aAttribute, TInt& aValue); |
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171 |
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172 |
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173 /** |
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174 Sets the specified HAL attribute. |
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175 |
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176 @param aDeviceNumber The device number. (eg: screen number) |
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177 @param aAttribute The HAL attribute. |
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178 @param aValue The attribute value. |
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179 |
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180 @return KErrNone, if successful; |
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181 KErrNotSupported, if the attribute is not defined in the list |
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182 of attributes, or is not meaningful for this device, or is |
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183 not settable. |
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184 |
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185 @see HALData::TAttribute |
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186 @see HALData::TAttributeProperty |
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187 |
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188 @capability WriteDeviceData or other capability specified |
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189 for individual attributes in TAttribute |
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190 */ |
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191 IMPORT_C static TInt Set(TInt aDeviceNumber, TAttribute aAttribute, TInt aValue); |
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192 }; |
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193 |
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194 |
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195 /** |
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196 @internalComponent |
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197 */ |
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198 static const TInt32 KUidHalPropertyKeyBase = 0x1020E306; |
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199 |
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200 __ASSERT_COMPILE(HAL::ENumHalAttributes<256); // only 256 UIDs allocated for HAL property keys |
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201 |
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202 |
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203 |
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204 #endif |