Modules/USB/Core/hub.c

   1 /*
   2  * Acess2 USB Stack
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * hub.c
   6  * - Basic hub driver
   7  */
   8 #include <usb_hub.h>
   9
  10 #define MAX_PORTS       32      // Not actually a max, but used for DeviceRemovable
  11
  12 #define GET_STATUS      0
  13 #define SET_FEATURE     3
  14
  15 #define PORT_CONNECTION 0
  16 #define PORT_ENABLE     1
  17 #define PORT_RESET      4
  18 #define PORT_POWER      8
  19
  20 struct sHubDescriptor
  21 {
  22         Uint8   DescLength;
  23         Uint8   DescType;       // = 0x29
  24         Uint8   NbrPorts;
  25         Uint16  HubCharacteristics;
  26         Uint8   PwrOn2PwrGood;  // 2 ms intervals
  27         Uint8   HubContrCurrent;        // Max internal current (mA)
  28         Uint8   DeviceRemovable[MAX_PORTS];
  29 };
  30
  31 struct sHubInfo
  32 {
  33         tUSBHub *HubPtr;
  34          int    PowerOnDelay;   // in ms
  35          int    nPorts;
  36         Uint8   DeviceRemovable[];
  37 };
  38
  39 // === PROTOTYPES ===
  40 void    Hub_Connected(tUSBInterface *Dev);
  41 void    Hub_Disconnected(tUSBInterface *Dev);
  42 void    Hub_PortStatusChange(tUSBInterface *Dev, int Length, void *Data);
  43 void    Hub_int_HandleChange(tUSBInterface *Dev, int Port);
  44
  45 // === GLOBALS ===
  46 tUSBDriver      gUSBHub_Driver = {
  47         .Name = "Hub",
  48         .Match = {.Class = {0x090000, 0xFF0000}},
  49         .Connected = Hub_Connected,
  50         .Disconnected = Hub_Disconnected,
  51         .MaxEndpoints = 1,
  52         .Endpoints = {
  53                 {0x83, Hub_PortStatusChange}
  54         }
  55 };
  56
  57 // === CODE ===
  58 #if 0
  59 int Hub_DriverInitialise(char **Arguments)
  60 {
  61         USB_RegisterDriver( &gUSBHub_Driver );
  62         return 0;
  63 }
  64 #endif
  65
  66 void Hub_Connected(tUSBInterface *Dev)
  67 {
  68         struct sHubDescriptor   hub_desc;
  69         struct sHubInfo *info;
  70
  71         // Read hub descriptor
  72         USB_ReadDescriptor(Dev, 0x29, 0, sizeof(hub_desc), &hub_desc);
  73
  74         LOG("%i Ports", hub_desc.NbrPorts);
  75         LOG("Takes %i ms for power to stabilise", hub_desc.PwrOn2PwrGood*2);
  76
  77         // Allocate infomation structure
  78         info = malloc(sizeof(*info) + (hub_desc.NbrPorts+7)/8);
  79         if(!info) {
  80                 Log_Error("USBHub", "malloc() failed");
  81                 return ;
  82         }
  83         USB_SetDeviceDataPtr(Dev, info);
  84
  85         // Fill data
  86         info->nPorts = hub_desc.NbrPorts;
  87         info->PowerOnDelay = hub_desc.PwrOn2PwrGood * 2;
  88         memcpy(info->DeviceRemovable, hub_desc.DeviceRemovable, (hub_desc.NbrPorts+7)/8);
  89         // Register
  90         info->HubPtr = USB_RegisterHub(Dev, info->nPorts);
  91
  92         // Register poll on endpoint
  93         USB_StartPollingEndpoint(Dev, 1);
  94 }
  95
  96 void Hub_Disconnected(tUSBInterface *Dev)
  97 {
  98         struct sHubInfo *info = USB_GetDeviceDataPtr(Dev);
  99         USB_RemoveHub(info->HubPtr);
 100         free(info);
 101 }
 102
 103 void Hub_PortStatusChange(tUSBInterface *Dev, int Length, void *Data)
 104 {
 105         Uint8   *status = Data;
 106         struct sHubInfo *info = USB_GetDeviceDataPtr(Dev);
 107          int    i;
 108         for( i = 0; i < info->nPorts; i += 8, status ++ )
 109         {
 110                 if( i/8 >= Length )     break;
 111                 if( *status == 0 )      continue;
 112
 113                 for( int j = 0; j < 8; j ++ )
 114                         if( *status & (1 << j) )
 115                                 Hub_int_HandleChange(Dev, i+j);
 116         }
 117 }
 118
 119 void Hub_int_HandleChange(tUSBInterface *Dev, int Port)
 120 {
 121         struct sHubInfo *info = USB_GetDeviceDataPtr(Dev);
 122         Uint16  status[2];      // Status, Change
 123
 124         // Get port status
 125         USB_Request(Dev, 0, 0xA3, GET_STATUS, 0, Port, 4, status);
 126
 127         // Handle connections / disconnections
 128         if( status[1] & 0x0001 )
 129         {
 130                 if( status[0] & 0x0001 ) {
 131                         // Connected
 132                         // - Power on port
 133                         USB_Request(Dev, 0, 0x23, SET_FEATURE, PORT_POWER, Port, 0, NULL);
 134                         Time_Delay(info->PowerOnDelay);
 135                         // - Reset
 136                         USB_Request(Dev, 0, 0x23, SET_FEATURE, PORT_RESET, Port, 0, NULL);
 137                         Time_Delay(20); // Spec says 10ms after reset, but how long is reset?
 138                         // - Enable
 139                         USB_Request(Dev, 0, 0x23, SET_FEATURE, PORT_ENABLE, Port, 0, NULL);
 140                         // - Poke USB Stack
 141                         USB_DeviceConnected(info->HubPtr, Port);
 142                 }
 143                 else {
 144                         // Disconnected
 145                         USB_DeviceDisconnected(info->HubPtr, Port);
 146                 }
 147         }
 148 }
 149