Rev 3555 | Rev 3908 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
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3555 | Serge | 1 | ; Implementation of the USB protocol for device enumeration. |
2 | ; Manage a USB device when it becomes ready for USB commands: |
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3 | ; configure, enumerate, load the corresponding driver(s), |
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4 | ; pass device information to the driver. |
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5 | |||
6 | ; ============================================================================= |
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7 | ; ================================= Constants ================================= |
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8 | ; ============================================================================= |
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9 | ; USB standard request codes |
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10 | USB_GET_STATUS = 0 |
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11 | USB_CLEAR_FEATURE = 1 |
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12 | USB_SET_FEATURE = 3 |
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13 | USB_SET_ADDRESS = 5 |
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14 | USB_GET_DESCRIPTOR = 6 |
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15 | USB_SET_DESCRIPTOR = 7 |
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16 | USB_GET_CONFIGURATION = 8 |
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17 | USB_SET_CONFIGURATION = 9 |
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18 | USB_GET_INTERFACE = 10 |
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19 | USB_SET_INTERFACE = 11 |
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20 | USB_SYNCH_FRAME = 12 |
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21 | |||
22 | ; USB standard descriptor types |
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23 | USB_DEVICE_DESCR = 1 |
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24 | USB_CONFIG_DESCR = 2 |
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25 | USB_STRING_DESCR = 3 |
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26 | USB_INTERFACE_DESCR = 4 |
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27 | USB_ENDPOINT_DESCR = 5 |
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28 | USB_DEVICE_QUALIFIER_DESCR = 6 |
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29 | USB_OTHER_SPEED_CONFIG_DESCR = 7 |
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30 | USB_INTERFACE_POWER_DESCR = 8 |
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31 | |||
32 | ; Possible speeds of USB devices |
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33 | USB_SPEED_FS = 0 ; full-speed |
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34 | USB_SPEED_LS = 1 ; low-speed |
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35 | USB_SPEED_HS = 2 ; high-speed |
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36 | |||
37 | ; Compile-time setting. If set, the code will dump all descriptors as they are |
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38 | ; read to the debug board. |
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39 | USB_DUMP_DESCRIPTORS = 1 |
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40 | |||
41 | ; ============================================================================= |
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42 | ; ================================ Structures ================================= |
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43 | ; ============================================================================= |
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44 | ; USB descriptors. See USB specification for detailed explanations. |
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45 | ; First two bytes of every descriptor have the same meaning. |
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46 | struct usb_descr |
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47 | bLength db ? |
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48 | ; Size of this descriptor in bytes |
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49 | bDescriptorType db ? |
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50 | ; One of USB_*_DESCR constants. |
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51 | ends |
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52 | |||
53 | ; USB device descriptor |
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54 | struct usb_device_descr usb_descr |
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55 | bcdUSB dw ? |
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56 | ; USB Specification Release number in BCD, e.g. 110h = USB 1.1 |
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57 | bDeviceClass db ? |
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58 | ; USB Device Class Code |
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59 | bDeviceSubClass db ? |
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60 | ; USB Device Subclass Code |
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61 | bDeviceProtocol db ? |
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62 | ; USB Device Protocol Code |
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63 | bMaxPacketSize0 db ? |
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64 | ; Maximum packet size for zero endpoint |
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65 | idVendor dw ? |
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66 | ; Vendor ID |
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67 | idProduct dw ? |
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68 | ; Product ID |
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69 | bcdDevice dw ? |
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70 | ; Device release number in BCD |
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71 | iManufacturer db ? |
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72 | ; Index of string descriptor describing manufacturer |
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73 | iProduct db ? |
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74 | ; Index of string descriptor describing product |
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75 | iSerialNumber db ? |
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76 | ; Index of string descriptor describing serial number |
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77 | bNumConfigurations db ? |
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78 | ; Number of possible configurations |
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79 | ends |
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80 | |||
81 | ; USB configuration descriptor |
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82 | struct usb_config_descr usb_descr |
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83 | wTotalLength dw ? |
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84 | ; Total length of data returned for this configuration |
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85 | bNumInterfaces db ? |
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86 | ; Number of interfaces in this configuration |
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87 | bConfigurationValue db ? |
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88 | ; Value for SET_CONFIGURATION control request |
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89 | iConfiguration db ? |
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90 | ; Index of string descriptor describing this configuration |
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91 | bmAttributes db ? |
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92 | ; Bit 6 is SelfPowered, bit 5 is RemoteWakeupSupported, |
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93 | ; bit 7 must be 1, other bits must be 0 |
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94 | bMaxPower db ? |
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95 | ; Maximum power consumption from the bus in 2mA units |
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96 | ends |
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97 | |||
98 | ; USB interface descriptor |
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99 | struct usb_interface_descr usb_descr |
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100 | ; The following two fields work in pair. Sometimes one interface can work |
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101 | ; in different modes; e.g. videostream from web-cameras requires different |
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102 | ; bandwidth depending on resolution/quality/compression settings. |
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103 | ; Each mode of each interface has its own descriptor with its own endpoints |
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104 | ; following; all descriptors for one interface have the same bInterfaceNumber, |
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105 | ; and different bAlternateSetting. |
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106 | ; By default, any interface operates in mode with bAlternateSetting = 0. |
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107 | ; Often this is the only mode. If there are another modes, the active mode |
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108 | ; is selected by SET_INTERFACE(bAlternateSetting) control request. |
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109 | bInterfaceNumber db ? |
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110 | bAlternateSetting db ? |
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111 | bNumEndpoints db ? |
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112 | ; Number of endpoints used by this interface, excluding zero endpoint |
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113 | bInterfaceClass db ? |
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114 | ; USB Interface Class Code |
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115 | bInterfaceSubClass db ? |
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116 | ; USB Interface Subclass Code |
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117 | bInterfaceProtocol db ? |
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118 | ; USB Interface Protocol Code |
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119 | iInterface db ? |
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120 | ; Index of string descriptor describing this interface |
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121 | ends |
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122 | |||
123 | ; USB endpoint descriptor |
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124 | struct usb_endpoint_descr usb_descr |
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125 | bEndpointAddress db ? |
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126 | ; Lower 4 bits form endpoint number, |
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127 | ; upper bit is 0 for OUT endpoints and 1 for IN endpoints, |
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128 | ; other bits must be zero |
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129 | bmAttributes db ? |
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130 | ; Lower 2 bits form transfer type, one of *_PIPE, |
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131 | ; other bits must be zero for non-isochronous endpoints; |
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132 | ; refer to the USB specification for meaning in isochronous case |
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133 | wMaxPacketSize dw ? |
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134 | ; Lower 11 bits form maximum packet size, |
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135 | ; next two bits specify the number of additional transactions per microframe |
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136 | ; for high-speed periodic endpoints, other bits must be zero. |
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137 | bInterval db ? |
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138 | ; Interval for polling endpoint for data transfers. |
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139 | ; Isochronous and high-speed interrupt endpoints: poll every 2^(bInterval-1) |
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140 | ; (micro)frames |
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141 | ; Full/low-speed interrupt endpoints: poll every bInterval frames |
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142 | ; High-speed bulk/control OUT endpoints: maximum NAK rate |
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143 | ends |
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144 | |||
145 | ; ============================================================================= |
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146 | ; =================================== Code ==================================== |
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147 | ; ============================================================================= |
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148 | |||
149 | ; When a new device is ready to be configured, a controller-specific code |
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150 | ; calls usb_new_device. |
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151 | ; The sequence of further actions: |
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152 | ; * open pipe for the zero endpoint (usb_new_device); |
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153 | ; maximum packet size is not known yet, but it must be at least 8 bytes, |
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154 | ; so it is safe to send packets with <= 8 bytes |
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155 | ; * issue SET_ADDRESS control request (usb_new_device) |
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156 | ; * set the new device address in the pipe (usb_set_address_callback) |
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157 | ; * notify a controller-specific code that initialization of other ports |
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158 | ; can be started (usb_set_address_callback) |
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159 | ; * issue GET_DESCRIPTOR control request for first 8 bytes of device descriptor |
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160 | ; (usb_after_set_address) |
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161 | ; * first 8 bytes of device descriptor contain the true packet size for zero |
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162 | ; endpoint, so set the true packet size (usb_get_descr8_callback) |
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163 | ; * first 8 bytes of a descriptor contain the full size of this descriptor, |
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164 | ; issue GET_DESCRIPTOR control request for the full device descriptor |
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165 | ; (usb_after_set_endpoint_size) |
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166 | ; * issue GET_DESCRIPTOR control request for first 8 bytes of configuration |
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167 | ; descriptor (usb_get_descr_callback) |
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168 | ; * issue GET_DESCRIPTOR control request for full configuration descriptor |
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169 | ; (usb_know_length_callback) |
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170 | ; * issue SET_CONFIGURATION control request (usb_set_config_callback) |
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171 | ; * parse configuration descriptor, load the corresponding driver(s), |
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172 | ; pass the configuration descriptor to the driver and let the driver do |
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173 | ; the further work (usb_got_config_callback) |
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174 | |||
175 | ; This function is called from controller-specific part |
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176 | ; when a new device is ready to be configured. |
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177 | ; in: ecx -> pseudo-pipe, part of usb_pipe |
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178 | ; in: esi -> usb_controller |
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179 | ; in: [esi+usb_controller.ResettingHub] is the pointer to usb_hub for device, |
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180 | ; NULL if the device is connected to the root hub |
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181 | ; in: [esi+usb_controller.ResettingPort] is the port for the device, zero-based |
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182 | ; in: [esi+usb_controller.ResettingSpeed] is the speed of the device, one of |
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183 | ; USB_SPEED_xx. |
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184 | ; out: eax = 0 <=> failed, the caller should disable the port. |
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185 | proc usb_new_device |
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186 | push ebx edi ; save used registers to be stdcall |
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187 | ; 1. Allocate resources. Any device uses the following resources: |
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188 | ; - device address in the bus |
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189 | ; - memory for device data |
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190 | ; - pipe for zero endpoint |
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191 | ; If some allocation fails, we must undo our actions. Closing the pipe |
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192 | ; is a hard task, so we avoid it and open the pipe as the last resource. |
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193 | ; The order for other two allocations is quite arbitrary. |
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194 | ; 1a. Allocate a bus address. |
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195 | push ecx |
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196 | call usb_set_address_request |
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197 | pop ecx |
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198 | ; 1b. If failed, just return zero. |
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199 | test eax, eax |
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200 | jz .nothing |
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201 | ; 1c. Allocate memory for device data. |
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202 | ; For now, we need sizeof.usb_device_data and extra 8 bytes for GET_DESCRIPTOR |
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203 | ; input and output, see usb_after_set_address. Later we will reallocate it |
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204 | ; to actual size needed for descriptors. |
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205 | push sizeof.usb_device_data + 8 |
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206 | pop eax |
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207 | push ecx |
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208 | call malloc |
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209 | pop ecx |
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210 | ; 1d. If failed, free the bus address and return zero. |
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211 | test eax, eax |
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212 | jz .nomemory |
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213 | ; 1e. Open pipe for endpoint zero. |
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214 | ; For now, we do not know the actual maximum packet size; |
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215 | ; for full-speed devices it can be any of 8, 16, 32, 64 bytes, |
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216 | ; low-speed devices must have 8 bytes, high-speed devices must have 64 bytes. |
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217 | ; Thus, we must use some fake "maximum packet size" until the actual size |
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218 | ; will be known. However, the maximum packet size must be at least 8, and |
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219 | ; initial stages of the configuration process involves only packets of <= 8 |
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220 | ; bytes, they will be transferred correctly as long as |
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221 | ; the fake "maximum packet size" is also at least 8. |
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222 | ; Thus, any number >= 8 is suitable for actual hardware. |
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223 | ; However, software emulation of EHCI in VirtualBox assumes that high-speed |
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224 | ; control transfers are those originating from pipes with max packet size = 64, |
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225 | ; even on early stages of the configuration process. This is incorrect, |
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226 | ; but we have no specific preferences, so let VirtualBox be happy and use 64 |
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227 | ; as the fake "maximum packet size". |
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228 | push eax |
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229 | ; We will need many zeroes. |
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230 | ; "push edi" is one byte, "push 0" is two bytes; save space, use edi. |
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231 | xor edi, edi |
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232 | stdcall usb_open_pipe, ecx, edi, 64, edi, edi |
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233 | ; Put pointer to pipe into ebx. "xchg eax,reg" is one byte, mov is two bytes. |
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234 | xchg eax, ebx |
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235 | pop eax |
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236 | ; 1f. If failed, free the memory, the bus address and return zero. |
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237 | test ebx, ebx |
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238 | jz .freememory |
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239 | ; 2. Store pointer to device data in the pipe structure. |
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240 | mov [ebx+usb_pipe.DeviceData], eax |
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241 | ; 3. Init device data, using usb_controller.Resetting* variables. |
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242 | mov [eax+usb_device_data.NumPipes], 1 |
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243 | mov [eax+usb_device_data.ConfigDataSize], edi |
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244 | mov [eax+usb_device_data.Interfaces], edi |
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245 | movzx ecx, [esi+usb_controller.ResettingPort] |
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246 | ; Note: the following write zeroes |
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247 | ; usb_device_data.DeviceDescrSize, usb_device_data.NumInterfaces, |
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248 | ; usb_device_data.Speed. |
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249 | mov dword [eax+usb_device_data.Port], ecx |
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250 | mov dl, [esi+usb_controller.ResettingSpeed] |
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251 | mov [eax+usb_device_data.Speed], dl |
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252 | mov edx, [esi+usb_controller.ResettingHub] |
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253 | mov [eax+usb_device_data.Hub], edx |
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254 | ; 4. Store pointer to the config pipe in the hub data. |
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255 | ; Config pipe serves as device identifier. |
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256 | ; Root hubs use the array inside usb_controller structure, |
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257 | ; non-root hubs use the array immediately after usb_hub structure. |
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258 | test edx, edx |
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259 | jz .roothub |
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260 | mov edx, [edx+usb_hub.ConnectedDevicesPtr] |
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261 | mov [edx+ecx*4], ebx |
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262 | jmp @f |
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263 | .roothub: |
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264 | mov [esi+usb_controller.DevicesByPort+ecx*4], ebx |
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265 | @@: |
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266 | call usb_reinit_pipe_list |
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267 | ; 5. Issue SET_ADDRESS control request, using buffer filled in step 1a. |
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268 | ; Use the return value from usb_control_async as our return value; |
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269 | ; if it is zero, then something has failed. |
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270 | lea eax, [esi+usb_controller.SetAddressBuffer] |
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271 | stdcall usb_control_async, ebx, eax, edi, edi, usb_set_address_callback, edi, edi |
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272 | .nothing: |
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273 | ; 6. Return. |
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274 | pop edi ebx ; restore used registers to be stdcall |
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275 | ret |
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276 | ; Handlers of failures in steps 1b, 1d, 1f. |
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277 | .freememory: |
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278 | call free |
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279 | jmp .freeaddr |
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280 | .nomemory: |
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281 | dbgstr 'No memory for device data' |
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282 | .freeaddr: |
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283 | mov ecx, dword [esi+usb_controller.SetAddressBuffer+2] |
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284 | bts [esi+usb_controller.ExistingAddresses], ecx |
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285 | xor eax, eax |
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286 | jmp .nothing |
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287 | endp |
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288 | |||
289 | ; Helper procedure for usb_new_device. |
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290 | ; Allocates a new USB address and fills usb_controller.SetAddressBuffer |
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291 | ; with data for SET_ADDRESS(allocated_address) request. |
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292 | ; out: eax = 0 <=> failed |
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293 | ; Destroys edi. |
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294 | proc usb_set_address_request |
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295 | ; There are 128 bits, one for each possible address. |
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296 | ; Note: only the USB thread works with usb_controller.ExistingAddresses, |
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297 | ; so there is no need for synchronization. |
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298 | ; We must find a bit set to 1 and clear it. |
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299 | ; 1. Find the first dword which has a nonzero bit = which is nonzero. |
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300 | mov ecx, 128/32 |
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301 | lea edi, [esi+usb_controller.ExistingAddresses] |
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302 | xor eax, eax |
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303 | repz scasd |
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304 | ; 2. If all dwords are zero, return an error. |
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305 | jz .error |
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306 | ; 3. The dword at [edi-4] is nonzero. Find the lowest nonzero bit. |
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307 | bsf eax, [edi-4] |
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308 | ; Now eax = bit number inside the dword at [edi-4]. |
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309 | ; 4. Clear the bit. |
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310 | btr [edi-4], eax |
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311 | ; 5. Generate the address by edi = memory address and eax = bit inside dword. |
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312 | ; Address = eax + 8 * (edi-4 - (esi+usb_controller.ExistingAddress)). |
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313 | sub edi, esi |
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314 | lea edi, [eax+(edi-4-usb_controller.ExistingAddresses)*8] |
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315 | ; 6. Store the allocated address in SetAddressBuffer and fill remaining fields. |
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316 | ; Note that usb_controller is zeroed at allocation, so only command byte needs |
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317 | ; to be filled. |
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318 | mov byte [esi+usb_controller.SetAddressBuffer+1], USB_SET_ADDRESS |
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319 | mov dword [esi+usb_controller.SetAddressBuffer+2], edi |
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320 | ; 7. Return non-zero value in eax. |
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321 | inc eax |
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322 | .nothing: |
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323 | ret |
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324 | .error: |
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325 | dbgstr 'cannot allocate USB address' |
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326 | xor eax, eax |
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327 | jmp .nothing |
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328 | endp |
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329 | |||
330 | ; This procedure is called by USB stack when SET_ADDRESS request initiated by |
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331 | ; usb_new_device is completed, either successfully or unsuccessfully. |
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332 | ; Note that USB stack uses esi = pointer to usb_controller. |
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333 | proc usb_set_address_callback stdcall, pipe:dword, status:dword, buffer:dword, length:dword, calldata:dword |
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334 | push ebx ; save ebx to be stdcall |
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335 | ; Load data to registers for further references. |
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336 | mov ebx, [pipe] |
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337 | mov ecx, dword [esi+usb_controller.SetAddressBuffer+2] |
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338 | mov eax, [esi+usb_controller.HardwareFunc] |
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339 | ; 1. Check whether the device has accepted new address. If so, proceed to 2. |
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340 | ; Otherwise, go to 3. |
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341 | cmp [status], 0 |
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342 | jnz .error |
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343 | ; 2. Address accepted. |
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344 | ; 2a. The controller-specific structure for the control pipe still uses |
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345 | ; zero address. Call the controller-specific function to change it to |
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346 | ; the actual address. |
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347 | ; Note that the hardware could cache the controller-specific structure, |
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348 | ; so setting the address could take some time until the cache is evicted. |
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349 | ; Thus, the call is asynchronous; meet us in usb_after_set_address when it will |
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350 | ; be safe to continue. |
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351 | dbgstr 'address set in device' |
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352 | call [eax+usb_hardware_func.SetDeviceAddress] |
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353 | ; 2b. If the port is in non-root hub, clear 'reset in progress' flag. |
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354 | ; In any case, proceed to 4. |
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355 | mov eax, [esi+usb_controller.ResettingHub] |
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356 | test eax, eax |
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357 | jz .return |
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358 | and [eax+usb_hub.Actions], not HUB_RESET_IN_PROGRESS |
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359 | .return: |
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360 | ; 4. Address configuration done, we can proceed with other ports. |
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361 | ; Call the worker function for that. |
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362 | call usb_test_pending_port |
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363 | .nothing: |
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364 | pop ebx ; restore ebx to be stdcall |
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365 | ret |
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366 | .error: |
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367 | ; 3. Device error: device not responding, disconnect etc. |
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368 | DEBUGF 1,'K : error %d in SET_ADDRESS, USB device disabled\n',[status] |
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369 | ; 3a. The address has not been accepted. Mark it as free. |
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370 | bts dword [esi+usb_controller.ExistingAddresses], ecx |
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371 | ; 3b. Disable the port with bad device. |
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372 | ; For the root hub, call the controller-specific function and go to 6. |
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373 | ; For non-root hubs, let the hub code do its work and return (the request |
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374 | ; could take some time, the hub code is responsible for proceeding). |
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375 | cmp [esi+usb_controller.ResettingHub], 0 |
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376 | jz .roothub |
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377 | mov eax, [esi+usb_controller.ResettingHub] |
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378 | call usb_hub_disable_resetting_port |
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379 | jmp .nothing |
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380 | .roothub: |
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381 | movzx ecx, [esi+usb_controller.ResettingPort] |
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382 | call [eax+usb_hardware_func.PortDisable] |
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383 | jmp .return |
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384 | endp |
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385 | |||
386 | ; This procedure is called from usb_subscription_done when the hardware cache |
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387 | ; is cleared after request from usb_set_address_callback. |
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388 | ; in: ebx -> usb_pipe |
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389 | proc usb_after_set_address |
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390 | dbgstr 'address set for controller' |
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391 | ; Issue control transfer GET_DESCRIPTOR(DEVICE_DESCR) for first 8 bytes. |
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392 | ; Remember, we still do not know the actual packet size; |
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393 | ; 8-bytes-request is safe. |
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394 | ; usb_new_device has allocated 8 extra bytes besides sizeof.usb_device_data; |
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395 | ; use them for both input and output. |
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396 | mov eax, [ebx+usb_pipe.DeviceData] |
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397 | add eax, usb_device_data.DeviceDescriptor |
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398 | mov dword [eax], \ |
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399 | 80h + \ ; device-to-host, standard, device-wide |
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400 | (USB_GET_DESCRIPTOR shl 8) + \ ; request |
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401 | (0 shl 16) + \ ; descriptor index: there is only one |
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402 | (USB_DEVICE_DESCR shl 24) ; descriptor type |
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403 | mov dword [eax+4], 8 shl 16 ; data length |
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404 | stdcall usb_control_async, ebx, eax, eax, 8, usb_get_descr8_callback, eax, 0 |
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405 | ret |
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406 | endp |
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407 | |||
408 | ; This procedure is called by USB stack when GET_DESCRIPTOR(DEVICE_DESCR) |
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409 | ; request initiated by usb_after_set_address is completed, either successfully |
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410 | ; or unsuccessfully. |
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411 | ; Note that USB stack uses esi = pointer to usb_controller. |
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412 | proc usb_get_descr8_callback stdcall, pipe:dword, status:dword, buffer:dword, length:dword, calldata:dword |
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413 | ; mov eax, [buffer] |
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414 | ; DEBUGF 1,'K : descr8: l=%x; %x %x %x %x %x %x %x %x\n',[length],\ |
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415 | ; [eax]:2,[eax+1]:2,[eax+2]:2,[eax+3]:2,[eax+4]:2,[eax+5]:2,[eax+6]:2,[eax+7]:2 |
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416 | push edi ebx ; save used registers to be stdcall |
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417 | mov ebx, [pipe] |
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418 | ; 1. Check whether the operation was successful. |
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419 | ; If not, say something to the debug board and stop the initialization. |
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420 | cmp [status], 0 |
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421 | jnz .error |
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422 | ; 2. Length of descriptor must be at least sizeof.usb_device_descr bytes. |
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423 | ; If not, say something to the debug board and stop the initialization. |
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424 | mov eax, [ebx+usb_pipe.DeviceData] |
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425 | cmp [eax+usb_device_data.DeviceDescriptor+usb_device_descr.bLength], sizeof.usb_device_descr |
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426 | jb .error |
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427 | ; 3. Now first 8 bytes of device descriptor are known; |
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428 | ; set DeviceDescrSize accordingly. |
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429 | mov [eax+usb_device_data.DeviceDescrSize], 8 |
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430 | ; 4. The controller-specific structure for the control pipe still uses |
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431 | ; the fake "maximum packet size". Call the controller-specific function to |
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432 | ; change it to the actual packet size from the device. |
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433 | ; Note that the hardware could cache the controller-specific structure, |
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434 | ; so changing it could take some time until the cache is evicted. |
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435 | ; Thus, the call is asynchronous; meet us in usb_after_set_endpoint_size |
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436 | ; when it will be safe to continue. |
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437 | movzx ecx, [eax+usb_device_data.DeviceDescriptor+usb_device_descr.bMaxPacketSize0] |
||
438 | mov eax, [esi+usb_controller.HardwareFunc] |
||
439 | call [eax+usb_hardware_func.SetEndpointPacketSize] |
||
440 | .nothing: |
||
441 | ; 5. Return. |
||
442 | pop ebx edi ; restore used registers to be stdcall |
||
443 | ret |
||
444 | .error: |
||
445 | dbgstr 'error with USB device descriptor' |
||
446 | jmp .nothing |
||
447 | endp |
||
448 | |||
449 | ; This procedure is called from usb_subscription_done when the hardware cache |
||
450 | ; is cleared after request from usb_get_descr8_callback. |
||
451 | ; in: ebx -> usb_pipe |
||
452 | proc usb_after_set_endpoint_size |
||
453 | ; 1. Reallocate memory for device data: |
||
454 | ; add memory for now-known size of device descriptor and extra 8 bytes |
||
455 | ; for further actions. |
||
456 | ; 1a. Allocate new memory. |
||
457 | mov eax, [ebx+usb_pipe.DeviceData] |
||
458 | movzx eax, [eax+usb_device_data.DeviceDescriptor+usb_device_descr.bLength] |
||
459 | ; save length for step 2 |
||
460 | push eax |
||
461 | add eax, sizeof.usb_device_data + 8 |
||
462 | call malloc |
||
463 | ; 1b. If failed, say something to the debug board and stop the initialization. |
||
464 | test eax, eax |
||
465 | jz .nomemory |
||
466 | ; 1c. Copy data from old memory to new memory and switch the pointer in usb_pipe. |
||
467 | push eax |
||
468 | push esi edi |
||
469 | mov esi, [ebx+usb_pipe.DeviceData] |
||
470 | mov [ebx+usb_pipe.DeviceData], eax |
||
471 | mov edi, eax |
||
472 | mov eax, esi |
||
473 | repeat sizeof.usb_device_data / 4 |
||
474 | movsd |
||
475 | end repeat |
||
476 | pop edi esi |
||
477 | call usb_reinit_pipe_list |
||
478 | ; 1d. Free the old memory. |
||
479 | ; Note that free destroys ebx. |
||
480 | push ebx |
||
481 | call free |
||
482 | pop ebx |
||
483 | pop eax |
||
484 | ; 2. Issue control transfer GET_DESCRIPTOR(DEVICE) for full descriptor. |
||
485 | ; restore length saved in step 1a |
||
486 | pop edx |
||
487 | add eax, sizeof.usb_device_data |
||
488 | mov dword [eax], \ |
||
489 | 80h + \ ; device-to-host, standard, device-wide |
||
490 | (USB_GET_DESCRIPTOR shl 8) + \ ; request |
||
491 | (0 shl 16) + \ ; descriptor index: there is only one |
||
492 | (USB_DEVICE_DESCR shl 24) ; descriptor type |
||
493 | and dword [eax+4], 0 |
||
494 | mov [eax+6], dl ; data length |
||
495 | stdcall usb_control_async, ebx, eax, eax, edx, usb_get_descr_callback, eax, 0 |
||
496 | ; 3. Return. |
||
497 | ret |
||
498 | .nomemory: |
||
499 | dbgstr 'No memory for device data' |
||
500 | ret |
||
501 | endp |
||
502 | |||
503 | ; This procedure is called by USB stack when GET_DESCRIPTOR(DEVICE) |
||
504 | ; request initiated by usb_after_set_endpoint_size is completed, |
||
505 | ; either successfully or unsuccessfully. |
||
506 | proc usb_get_descr_callback stdcall, pipe:dword, status:dword, buffer:dword, length:dword, calldata:dword |
||
507 | ; Note: the prolog is the same as in usb_get_descr8_callback. |
||
508 | push edi ebx ; save used registers to be stdcall |
||
509 | ; 1. Check whether the operation was successful. |
||
510 | ; If not, say something to the debug board and stop the initialization. |
||
511 | cmp [status], 0 |
||
512 | jnz usb_get_descr8_callback.error |
||
513 | ; The full descriptor is known, dump it if specified by compile-time option. |
||
514 | if USB_DUMP_DESCRIPTORS |
||
515 | mov eax, [buffer] |
||
516 | mov ecx, [length] |
||
517 | sub ecx, 8 |
||
518 | jbe .skipdebug |
||
519 | DEBUGF 1,'K : device descriptor:' |
||
520 | @@: |
||
521 | DEBUGF 1,' %x',[eax]:2 |
||
522 | inc eax |
||
523 | dec ecx |
||
524 | jnz @b |
||
525 | DEBUGF 1,'\n' |
||
526 | .skipdebug: |
||
527 | end if |
||
528 | ; 2. Check that bLength is the same as was in the previous request. |
||
529 | ; If not, say something to the debug board and stop the initialization. |
||
530 | ; It is important, because usb_after_set_endpoint_size has allocated memory |
||
531 | ; according to the old bLength. Note that [length] for control transfers |
||
532 | ; includes 8 bytes of setup packet, so data length = [length] - 8. |
||
533 | mov eax, [buffer] |
||
534 | movzx ecx, [eax+usb_device_descr.bLength] |
||
535 | add ecx, 8 |
||
536 | cmp [length], ecx |
||
537 | jnz usb_get_descr8_callback.error |
||
538 | ; Amuse the user if she is watching the debug board. |
||
539 | mov cl, [eax+usb_device_descr.bNumConfigurations] |
||
540 | DEBUGF 1,'K : found USB device with ID %x:%x, %d configuration(s)\n',\ |
||
541 | [eax+usb_device_descr.idVendor]:4,\ |
||
542 | [eax+usb_device_descr.idProduct]:4,\ |
||
543 | cl |
||
544 | ; 3. If there are no configurations, stop the initialization. |
||
545 | cmp [eax+usb_device_descr.bNumConfigurations], 0 |
||
546 | jz .nothing |
||
547 | ; 4. Copy length of device descriptor to device data structure. |
||
548 | movzx edx, [eax+usb_device_descr.bLength] |
||
549 | mov [eax+usb_device_data.DeviceDescrSize-usb_device_data.DeviceDescriptor], dl |
||
550 | ; 5. Issue control transfer GET_DESCRIPTOR(CONFIGURATION). We do not know |
||
551 | ; the full length of that descriptor, so start with first 8 bytes, they contain |
||
552 | ; the full length. |
||
553 | ; usb_after_set_endpoint_size has allocated 8 extra bytes after the |
||
554 | ; device descriptor, use them for both input and output. |
||
555 | add eax, edx |
||
556 | mov dword [eax], \ |
||
557 | 80h + \ ; device-to-host, standard, device-wide |
||
558 | (USB_GET_DESCRIPTOR shl 8) + \ ; request |
||
559 | (0 shl 16) + \ ; descriptor index: there is only one |
||
560 | (USB_CONFIG_DESCR shl 24) ; descriptor type |
||
561 | mov dword [eax+4], 8 shl 16 ; data length |
||
562 | stdcall usb_control_async, [pipe], eax, eax, 8, usb_know_length_callback, eax, 0 |
||
563 | .nothing: |
||
564 | ; 6. Return. |
||
565 | pop ebx edi ; restore used registers to be stdcall |
||
566 | ret |
||
567 | endp |
||
568 | |||
569 | ; This procedure is called by USB stack when GET_DESCRIPTOR(CONFIGURATION) |
||
570 | ; request initiated by usb_get_descr_callback is completed, |
||
571 | ; either successfully or unsuccessfully. |
||
572 | proc usb_know_length_callback stdcall, pipe:dword, status:dword, buffer:dword, length:dword, calldata:dword |
||
573 | push ebx ; save used registers to be stdcall |
||
574 | ; 1. Check whether the operation was successful. |
||
575 | ; If not, say something to the debug board and stop the initialization. |
||
576 | cmp [status], 0 |
||
577 | jnz .error |
||
578 | ; 2. Get the total length of data associated with config descriptor and store |
||
579 | ; it in device data structure. The total length must be at least |
||
580 | ; sizeof.usb_config_descr bytes; if not, say something to the debug board and |
||
581 | ; stop the initialization. |
||
582 | mov eax, [buffer] |
||
583 | mov edx, [pipe] |
||
584 | movzx ecx, [eax+usb_config_descr.wTotalLength] |
||
585 | mov eax, [edx+usb_pipe.DeviceData] |
||
586 | cmp ecx, sizeof.usb_config_descr |
||
587 | jb .error |
||
588 | mov [eax+usb_device_data.ConfigDataSize], ecx |
||
589 | ; 3. Reallocate memory for device data: |
||
590 | ; include usb_device_data structure, device descriptor, |
||
591 | ; config descriptor with all associated data, and extra bytes |
||
592 | ; sufficient for 8 bytes control packet and for one usb_interface_data struc. |
||
593 | ; Align extra bytes to dword boundary. |
||
594 | if sizeof.usb_interface_data > 8 |
||
595 | .extra_size = sizeof.usb_interface_data |
||
596 | else |
||
597 | .extra_size = 8 |
||
598 | end if |
||
599 | ; 3a. Allocate new memory. |
||
600 | movzx edx, [eax+usb_device_data.DeviceDescrSize] |
||
601 | lea eax, [ecx+edx+sizeof.usb_device_data+.extra_size+3] |
||
602 | and eax, not 3 |
||
603 | push eax |
||
604 | call malloc |
||
605 | pop edx |
||
606 | ; 3b. If failed, say something to the debug board and stop the initialization. |
||
607 | test eax, eax |
||
608 | jz .nomemory |
||
609 | ; 3c. Copy data from old memory to new memory and switch the pointer in usb_pipe. |
||
610 | push eax |
||
611 | mov ebx, [pipe] |
||
612 | push esi edi |
||
613 | mov esi, [ebx+usb_pipe.DeviceData] |
||
614 | mov edi, eax |
||
615 | mov [ebx+usb_pipe.DeviceData], eax |
||
616 | mov eax, esi |
||
617 | movzx ecx, [esi+usb_device_data.DeviceDescrSize] |
||
618 | sub edx, .extra_size |
||
619 | mov [esi+usb_device_data.Interfaces], edx |
||
620 | add ecx, sizeof.usb_device_data + 8 |
||
621 | mov edx, ecx |
||
622 | shr ecx, 2 |
||
623 | and edx, 3 |
||
624 | rep movsd |
||
625 | mov ecx, edx |
||
626 | rep movsb |
||
627 | pop edi esi |
||
628 | call usb_reinit_pipe_list |
||
629 | ; 3d. Free old memory. |
||
630 | call free |
||
631 | pop eax |
||
632 | ; 4. Issue control transfer GET_DESCRIPTOR(DEVICE) for full descriptor. |
||
633 | movzx ecx, [eax+usb_device_data.DeviceDescrSize] |
||
634 | mov edx, [eax+usb_device_data.ConfigDataSize] |
||
635 | lea eax, [eax+ecx+sizeof.usb_device_data] |
||
636 | mov dword [eax], \ |
||
637 | 80h + \ ; device-to-host, standard, device-wide |
||
638 | (USB_GET_DESCRIPTOR shl 8) + \ ; request |
||
639 | (0 shl 16) + \ ; descriptor index: there is only one |
||
640 | (USB_CONFIG_DESCR shl 24) ; descriptor type |
||
641 | and dword [eax+4], 0 |
||
642 | mov word [eax+6], dx ; data length |
||
643 | stdcall usb_control_async, [pipe], eax, eax, edx, usb_set_config_callback, eax, 0 |
||
644 | .nothing: |
||
645 | ; 5. Return. |
||
646 | pop ebx ; restore used registers to be stdcall |
||
647 | ret |
||
648 | .error: |
||
649 | dbgstr 'error with USB configuration descriptor' |
||
650 | jmp .nothing |
||
651 | .nomemory: |
||
652 | dbgstr 'No memory for device data' |
||
653 | jmp .nothing |
||
654 | endp |
||
655 | |||
656 | ; This procedure is called by USB stack when GET_DESCRIPTOR(CONFIGURATION) |
||
657 | ; request initiated by usb_know_length_callback is completed, |
||
658 | ; either successfully or unsuccessfully. |
||
659 | proc usb_set_config_callback stdcall, pipe:dword, status:dword, buffer:dword, length:dword, calldata:dword |
||
660 | ; Note that the prolog is the same as in usb_know_length_callback. |
||
661 | push ebx ; save used registers to be stdcall |
||
662 | ; 1. Check whether the operation was successful. |
||
663 | ; If not, say something to the debug board and stop the initialization. |
||
664 | xor ecx, ecx |
||
665 | mov ebx, [pipe] |
||
666 | cmp [status], ecx |
||
667 | jnz usb_know_length_callback.error |
||
668 | ; The full descriptor is known, dump it if specified by compile-time option. |
||
669 | if USB_DUMP_DESCRIPTORS |
||
670 | mov eax, [buffer] |
||
671 | mov ecx, [length] |
||
672 | sub ecx, 8 |
||
673 | jbe .skip_debug |
||
674 | DEBUGF 1,'K : config descriptor:' |
||
675 | @@: |
||
676 | DEBUGF 1,' %x',[eax]:2 |
||
677 | inc eax |
||
678 | dec ecx |
||
679 | jnz @b |
||
680 | DEBUGF 1,'\n' |
||
681 | .skip_debug: |
||
682 | xor ecx, ecx |
||
683 | end if |
||
684 | ; 2. Issue control transfer SET_CONFIGURATION to activate this configuration. |
||
685 | ; Usually this is the only configuration. |
||
686 | ; Use extra bytes allocated by usb_know_length_callback; |
||
687 | ; offset from device data start is stored in Interfaces. |
||
688 | mov eax, [ebx+usb_pipe.DeviceData] |
||
689 | mov edx, [buffer] |
||
690 | add eax, [eax+usb_device_data.Interfaces] |
||
691 | mov dl, [edx+usb_config_descr.bConfigurationValue] |
||
692 | mov dword [eax], USB_SET_CONFIGURATION shl 8 |
||
693 | mov dword [eax+4], ecx |
||
694 | mov byte [eax+2], dl |
||
695 | stdcall usb_control_async, [pipe], eax, ecx, ecx, usb_got_config_callback, [buffer], ecx |
||
696 | pop ebx ; restore used registers to be stdcall |
||
697 | ret |
||
698 | endp |
||
699 | |||
700 | ; This procedure is called by USB stack when SET_CONFIGURATION |
||
701 | ; request initiated by usb_set_config_callback is completed, |
||
702 | ; either successfully or unsuccessfully. |
||
703 | ; If successfully, the device is configured and ready to work, |
||
704 | ; pass the device to the corresponding driver(s). |
||
705 | proc usb_got_config_callback stdcall, pipe:dword, status:dword, buffer:dword, length:dword, calldata:dword |
||
706 | locals |
||
707 | InterfacesData dd ? |
||
708 | NumInterfaces dd ? |
||
709 | driver dd ? |
||
710 | endl |
||
711 | ; 1. If there was an error, say something to the debug board and stop the |
||
712 | ; initialization. |
||
713 | cmp [status], 0 |
||
714 | jz @f |
||
715 | dbgstr 'USB error in SET_CONFIGURATION' |
||
716 | ret |
||
717 | @@: |
||
718 | push ebx edi ; save used registers to be stdcall |
||
719 | ; 2. Sanity checks: the total length must be the same as before (because we |
||
720 | ; have allocated memory assuming the old value), length of config descriptor |
||
721 | ; must be at least sizeof.usb_config_descr (we use fields from it), |
||
722 | ; there must be at least one interface. |
||
723 | mov ebx, [pipe] |
||
724 | mov ebx, [ebx+usb_pipe.DeviceData] |
||
725 | mov eax, [calldata] |
||
726 | mov edx, [ebx+usb_device_data.ConfigDataSize] |
||
727 | cmp [eax+usb_config_descr.wTotalLength], dx |
||
728 | jnz .invalid |
||
729 | cmp [eax+usb_config_descr.bLength], 9 |
||
730 | jb .invalid |
||
731 | movzx edx, [eax+usb_config_descr.bNumInterfaces] |
||
732 | test edx, edx |
||
733 | jnz @f |
||
734 | .invalid: |
||
735 | dbgstr 'error: invalid configuration descriptor' |
||
736 | jmp .nothing |
||
737 | @@: |
||
738 | ; 3. Store the number of interfaces in device data structure. |
||
739 | mov [ebx+usb_device_data.NumInterfaces], dl |
||
740 | ; 4. If there is only one interface (which happens quite often), |
||
741 | ; the memory allocated in usb_know_length_callback is sufficient. |
||
742 | ; Otherwise (which also happens quite often), reallocate device data. |
||
743 | ; 4a. Check whether there is only one interface. If so, skip this step. |
||
744 | cmp edx, 1 |
||
745 | jz .has_memory |
||
746 | ; 4b. Allocate new memory. |
||
747 | mov eax, [ebx+usb_device_data.Interfaces] |
||
748 | lea eax, [eax+edx*sizeof.usb_interface_data] |
||
749 | call malloc |
||
750 | ; 4c. If failed, say something to the debug board and |
||
751 | ; stop the initialization. |
||
752 | test eax, eax |
||
753 | jnz @f |
||
754 | dbgstr 'No memory for device data' |
||
755 | jmp .nothing |
||
756 | @@: |
||
757 | ; 4d. Copy data from old memory to new memory and switch the pointer in usb_pipe. |
||
758 | push eax |
||
759 | push esi |
||
760 | mov ebx, [pipe] |
||
761 | mov edi, eax |
||
762 | mov esi, [ebx+usb_pipe.DeviceData] |
||
763 | mov [ebx+usb_pipe.DeviceData], eax |
||
764 | mov eax, esi |
||
765 | mov ecx, [esi+usb_device_data.Interfaces] |
||
766 | shr ecx, 2 |
||
767 | rep movsd |
||
768 | pop esi |
||
769 | call usb_reinit_pipe_list |
||
770 | ; 4e. Free old memory. |
||
771 | call free |
||
772 | pop ebx |
||
773 | .has_memory: |
||
774 | ; 5. Initialize interfaces table: zero all contents. |
||
775 | mov edi, [ebx+usb_device_data.Interfaces] |
||
776 | add edi, ebx |
||
777 | mov [InterfacesData], edi |
||
778 | movzx ecx, [ebx+usb_device_data.NumInterfaces] |
||
779 | if sizeof.usb_interface_data <> 8 |
||
780 | You have changed sizeof.usb_interface_data? Modify this place too. |
||
781 | end if |
||
782 | add ecx, ecx |
||
783 | xor eax, eax |
||
784 | rep stosd |
||
785 | ; No interfaces are found yet. |
||
786 | mov [NumInterfaces], eax |
||
787 | ; 6. Get the pointer to config descriptor data. |
||
788 | ; Note: if there was reallocation, [buffer] is not valid anymore, |
||
789 | ; so calculate value based on usb_device_data. |
||
790 | movzx eax, [ebx+usb_device_data.DeviceDescrSize] |
||
791 | lea eax, [eax+ebx+sizeof.usb_device_data] |
||
792 | mov [calldata], eax |
||
793 | mov ecx, [ebx+usb_device_data.ConfigDataSize] |
||
794 | ; 7. Loop over all descriptors, |
||
795 | ; scan for interface descriptors with bAlternateSetting = 0, |
||
796 | ; load the corresponding driver, call its AddDevice function. |
||
797 | .descriptor_loop: |
||
798 | ; While in loop: eax points to the current descriptor, |
||
799 | ; ecx = number of bytes left, the iteration starts only if ecx is nonzero, |
||
800 | ; edx = size of the current descriptor. |
||
801 | ; 7a. The first byte is always accessible; it contains the length of |
||
802 | ; the current descriptor. Validate that the length is at least 2 bytes, |
||
803 | ; and the entire descriptor is readable (the length is at most number of |
||
804 | ; bytes left). |
||
805 | movzx edx, [eax+usb_descr.bLength] |
||
806 | cmp edx, sizeof.usb_descr |
||
807 | jb .invalid |
||
808 | cmp ecx, edx |
||
809 | jb .invalid |
||
810 | ; 7b. Check descriptor type. Ignore all non-INTERFACE descriptor. |
||
811 | cmp byte [eax+usb_descr.bDescriptorType], USB_INTERFACE_DESCR |
||
812 | jz .interface |
||
813 | .next_descriptor: |
||
814 | ; 7c. Advance pointer, decrease length left, if there is still something left, |
||
815 | ; continue the loop. |
||
816 | add eax, edx |
||
817 | sub ecx, edx |
||
818 | jnz .descriptor_loop |
||
819 | .done: |
||
820 | .nothing: |
||
821 | pop edi ebx ; restore used registers to be stdcall |
||
822 | ret |
||
823 | .interface: |
||
824 | ; 7d. Validate the descriptor length. |
||
825 | cmp edx, sizeof.usb_interface_descr |
||
826 | jb .next_descriptor |
||
827 | ; 7e. If bAlternateSetting is nonzero, this descriptor actually describes |
||
828 | ; another mode of already known interface and belongs to the already loaded |
||
829 | ; driver; amuse the user and continue to 7c. |
||
830 | cmp byte [eax+usb_interface_descr.bAlternateSetting], 0 |
||
831 | jz @f |
||
832 | DEBUGF 1,'K : note: alternate setting with %x/%x/%x\n',\ |
||
833 | [eax+usb_interface_descr.bInterfaceClass]:2,\ |
||
834 | [eax+usb_interface_descr.bInterfaceSubClass]:2,\ |
||
835 | [eax+usb_interface_descr.bInterfaceProtocol]:2 |
||
836 | jmp .next_descriptor |
||
837 | @@: |
||
838 | ; 7f. Check that the new interface does not overflow allocated table. |
||
839 | mov edx, [NumInterfaces] |
||
840 | inc dl |
||
841 | jz .invalid |
||
842 | cmp dl, [ebx+usb_device_data.NumInterfaces] |
||
843 | ja .invalid |
||
844 | ; 7g. We have found a new interface. Advance bookkeeping vars. |
||
845 | mov [NumInterfaces], edx |
||
846 | add [InterfacesData], sizeof.usb_interface_data |
||
847 | ; 7h. Save length left and pointer to the current interface descriptor. |
||
848 | push ecx eax |
||
849 | ; Amuse the user if she is watching the debug board. |
||
850 | DEBUGF 1,'K : USB interface class/subclass/protocol = %x/%x/%x\n',\ |
||
851 | [eax+usb_interface_descr.bInterfaceClass]:2,\ |
||
852 | [eax+usb_interface_descr.bInterfaceSubClass]:2,\ |
||
853 | [eax+usb_interface_descr.bInterfaceProtocol]:2 |
||
854 | ; 7i. Select the correct driver based on interface class. |
||
855 | ; For hubs, go to 7j. Otherwise, go to 7k. |
||
856 | ; Note: this should be rewritten as table-based lookup when more drivers will |
||
857 | ; be available. |
||
858 | cmp byte [eax+usb_interface_descr.bInterfaceClass], 9 |
||
859 | jz .found_hub |
||
860 | mov edx, usb_hid_name |
||
861 | cmp byte [eax+usb_interface_descr.bInterfaceClass], 3 |
||
862 | jz .load_driver |
||
863 | mov edx, usb_print_name |
||
864 | cmp byte [eax+usb_interface_descr.bInterfaceClass], 7 |
||
865 | jz .load_driver |
||
866 | mov edx, usb_stor_name |
||
867 | cmp byte [eax+usb_interface_descr.bInterfaceClass], 8 |
||
868 | jz .load_driver |
||
869 | mov edx, usb_other_name |
||
870 | jmp .load_driver |
||
871 | .found_hub: |
||
872 | ; 7j. Hubs are a part of USB stack, thus, integrated into the kernel. |
||
873 | ; Use the pointer to hub callbacks and go to 7m. |
||
874 | mov eax, usb_hub_pseudosrv - USBSRV.usb_func |
||
875 | jmp .driver_loaded |
||
876 | .load_driver: |
||
877 | ; 7k. Load the corresponding driver. |
||
878 | push ebx esi edi |
||
879 | stdcall get_service, edx |
||
880 | pop edi esi ebx |
||
881 | ; 7l. If failed, say something to the debug board and go to 7p. |
||
882 | test eax, eax |
||
883 | jnz .driver_loaded |
||
884 | dbgstr 'failed to load class driver' |
||
885 | jmp .next_descriptor2 |
||
886 | .driver_loaded: |
||
887 | ; 7m. Call AddDevice function of the driver. |
||
888 | ; Note that top of stack contains a pointer to the current interface, |
||
889 | ; saved by step 7h. |
||
890 | mov [driver], eax |
||
891 | mov eax, [eax+USBSRV.usb_func] |
||
892 | pop edx |
||
893 | push edx |
||
894 | ; Note: usb_hub_init assumes that edx points to usb_interface_descr, |
||
895 | ; ecx = length rest; if you change the code, modify usb_hub_init also. |
||
896 | stdcall [eax+USBFUNC.add_device], [pipe], [calldata], edx |
||
897 | ; 7n. If failed, say something to the debug board and go to 7p. |
||
898 | test eax, eax |
||
899 | jnz .store_data |
||
900 | dbgstr 'USB device initialization failed' |
||
901 | jmp .next_descriptor2 |
||
902 | .store_data: |
||
903 | ; 7o. Store the returned value and the driver handle to InterfacesData. |
||
904 | ; Note that step 7g has already advanced InterfacesData. |
||
905 | mov edx, [InterfacesData] |
||
906 | mov [edx+usb_interface_data.DriverData-sizeof.usb_interface_data], eax |
||
907 | mov eax, [driver] |
||
908 | mov [edx+usb_interface_data.DriverFunc-sizeof.usb_interface_data], eax |
||
909 | .next_descriptor2: |
||
910 | ; 7p. Restore registers saved in step 7h, get the descriptor length and |
||
911 | ; continue to 7c. |
||
912 | pop eax ecx |
||
913 | movzx edx, byte [eax+usb_descr.bLength] |
||
914 | jmp .next_descriptor |
||
915 | endp |
||
916 | |||
917 | ; Driver names, see step 7i of usb_got_config_callback. |
||
918 | iglobal |
||
919 | usb_hid_name db 'usbhid',0 |
||
920 | usb_stor_name db 'usbstor',0 |
||
921 | usb_print_name db 'usbprint',0 |
||
922 | usb_other_name db 'usbother',0 |
||
923 | endg>=>=>=>=> |