drivers/usb/host/uhci-hub.c

   1 /*
   2  * Universal Host Controller Interface driver for USB.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * (C) Copyright 1999 Linus Torvalds
   7  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
   8  * (C) Copyright 1999 Randy Dunlap
   9  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
  10  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
  11  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
  12  * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
  13  */
  14
  15 static __u8 root_hub_hub_des[] =
  16 {
  17         0x09,                   /*  __u8  bLength; */
  18         0x29,                   /*  __u8  bDescriptorType; Hub-descriptor */
  19         0x02,                   /*  __u8  bNbrPorts; */
  20         0x0a,                   /* __u16  wHubCharacteristics; */
  21         0x00,                   /*   (per-port OC, no power switching) */
  22         0x01,                   /*  __u8  bPwrOn2pwrGood; 2ms */
  23         0x00,                   /*  __u8  bHubContrCurrent; 0 mA */
  24         0x00,                   /*  __u8  DeviceRemovable; *** 7 Ports max *** */
  25         0xff                    /*  __u8  PortPwrCtrlMask; *** 7 ports max *** */
  26 };
  27
  28 #define UHCI_RH_MAXCHILD        7
  29
  30 /* must write as zeroes */
  31 #define WZ_BITS         (USBPORTSC_RES2 | USBPORTSC_RES3 | USBPORTSC_RES4)
  32
  33 /* status change bits:  nonzero writes will clear */
  34 #define RWC_BITS        (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
  35
  36 static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
  37 {
  38         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
  39         unsigned int io_addr = uhci->io_addr;
  40         int i;
  41
  42         *buf = 0;
  43         for (i = 0; i < uhci->rh_numports; i++) {
  44                 if (inw(io_addr + USBPORTSC1 + i * 2) & RWC_BITS)
  45                         *buf |= (1 << (i + 1));
  46         }
  47         return !!*buf;
  48 }
  49
  50 #define OK(x)                   len = (x); break
  51
  52 #define CLR_RH_PORTSTAT(x) \
  53         status = inw(port_addr); \
  54         status &= ~(RWC_BITS|WZ_BITS); \
  55         status &= ~(x); \
  56         status |= RWC_BITS & (x); \
  57         outw(status, port_addr)
  58
  59 #define SET_RH_PORTSTAT(x) \
  60         status = inw(port_addr); \
  61         status |= (x); \
  62         status &= ~(RWC_BITS|WZ_BITS); \
  63         outw(status, port_addr)
  64
  65
  66 /* size of returned buffer is part of USB spec */
  67 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  68                         u16 wIndex, char *buf, u16 wLength)
  69 {
  70         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
  71         int status, retval = 0, len = 0;
  72         unsigned int port_addr = uhci->io_addr + USBPORTSC1 + 2 * (wIndex-1);
  73         __u16 wPortChange, wPortStatus;
  74
  75         switch (typeReq) {
  76                 /* Request Destination:
  77                    without flags: Device,
  78                    RH_INTERFACE: interface,
  79                    RH_ENDPOINT: endpoint,
  80                    RH_CLASS means HUB here,
  81                    RH_OTHER | RH_CLASS  almost ever means HUB_PORT here
  82                 */
  83
  84         case GetHubStatus:
  85                 *(__u32 *)buf = cpu_to_le32(0);
  86                 OK(4);          /* hub power */
  87         case GetPortStatus:
  88                 if (!wIndex || wIndex > uhci->rh_numports)
  89                         goto err;
  90                 status = inw(port_addr);
  91
  92                 /* Intel controllers report the OverCurrent bit active on.
  93                  * VIA controllers report it active off, so we'll adjust the
  94                  * bit value.  (It's not standardized in the UHCI spec.)
  95                  */
  96                 if (to_pci_dev(hcd->self.controller)->vendor ==
  97                                 PCI_VENDOR_ID_VIA)
  98                         status ^= USBPORTSC_OC;
  99
 100                 /* UHCI doesn't support C_SUSPEND and C_RESET (always false) */
 101                 wPortChange = 0;
 102                 if (status & USBPORTSC_CSC)
 103                         wPortChange |= 1 << (USB_PORT_FEAT_C_CONNECTION - 16);
 104                 if (status & USBPORTSC_PEC)
 105                         wPortChange |= 1 << (USB_PORT_FEAT_C_ENABLE - 16);
 106                 if (status & USBPORTSC_OCC)
 107                         wPortChange |= 1 << (USB_PORT_FEAT_C_OVER_CURRENT - 16);
 108
 109                 /* UHCI has no power switching (always on) */
 110                 wPortStatus = 1 << USB_PORT_FEAT_POWER;
 111                 if (status & USBPORTSC_CCS)
 112                         wPortStatus |= 1 << USB_PORT_FEAT_CONNECTION;
 113                 if (status & USBPORTSC_PE) {
 114                         wPortStatus |= 1 << USB_PORT_FEAT_ENABLE;
 115                         if (status & (USBPORTSC_SUSP | USBPORTSC_RD))
 116                                 wPortStatus |= 1 << USB_PORT_FEAT_SUSPEND;
 117                 }
 118                 if (status & USBPORTSC_OC)
 119                         wPortStatus |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 120                 if (status & USBPORTSC_PR)
 121                         wPortStatus |= 1 << USB_PORT_FEAT_RESET;
 122                 if (status & USBPORTSC_LSDA)
 123                         wPortStatus |= 1 << USB_PORT_FEAT_LOWSPEED;
 124
 125                 if (wPortChange)
 126                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x\n",
 127                                         wIndex, status);
 128
 129                 *(__u16 *)buf = cpu_to_le16(wPortStatus);
 130                 *(__u16 *)(buf + 2) = cpu_to_le16(wPortChange);
 131                 OK(4);
 132         case SetHubFeature:             /* We don't implement these */
 133         case ClearHubFeature:
 134                 switch (wValue) {
 135                 case C_HUB_OVER_CURRENT:
 136                 case C_HUB_LOCAL_POWER:
 137                         OK(0);
 138                 default:
 139                         goto err;
 140                 }
 141                 break;
 142         case SetPortFeature:
 143                 if (!wIndex || wIndex > uhci->rh_numports)
 144                         goto err;
 145
 146                 switch (wValue) {
 147                 case USB_PORT_FEAT_SUSPEND:
 148                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
 149                         OK(0);
 150                 case USB_PORT_FEAT_RESET:
 151                         SET_RH_PORTSTAT(USBPORTSC_PR);
 152                         mdelay(50);     /* USB v1.1 7.1.7.3 */
 153                         CLR_RH_PORTSTAT(USBPORTSC_PR);
 154                         udelay(10);
 155                         SET_RH_PORTSTAT(USBPORTSC_PE);
 156                         mdelay(10);
 157                         CLR_RH_PORTSTAT(USBPORTSC_PEC|USBPORTSC_CSC);
 158                         OK(0);
 159                 case USB_PORT_FEAT_POWER:
 160                         /* UHCI has no power switching */
 161                         OK(0);
 162                 default:
 163                         goto err;
 164                 }
 165                 break;
 166         case ClearPortFeature:
 167                 if (!wIndex || wIndex > uhci->rh_numports)
 168                         goto err;
 169
 170                 switch (wValue) {
 171                 case USB_PORT_FEAT_ENABLE:
 172                         CLR_RH_PORTSTAT(USBPORTSC_PE);
 173                         OK(0);
 174                 case USB_PORT_FEAT_C_ENABLE:
 175                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
 176                         OK(0);
 177                 case USB_PORT_FEAT_SUSPEND:
 178                         CLR_RH_PORTSTAT(USBPORTSC_SUSP);
 179                         OK(0);
 180                 case USB_PORT_FEAT_C_SUSPEND:
 181                         /* this driver won't report these */
 182                         OK(0);
 183                 case USB_PORT_FEAT_POWER:
 184                         /* UHCI has no power switching */
 185                         goto err;
 186                 case USB_PORT_FEAT_C_CONNECTION:
 187                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
 188                         OK(0);
 189                 case USB_PORT_FEAT_C_OVER_CURRENT:
 190                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
 191                         OK(0);
 192                 case USB_PORT_FEAT_C_RESET:
 193                         /* this driver won't report these */
 194                         OK(0);
 195                 default:
 196                         goto err;
 197                 }
 198                 break;
 199         case GetHubDescriptor:
 200                 len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
 201                 memcpy(buf, root_hub_hub_des, len);
 202                 if (len > 2)
 203                         buf[2] = uhci->rh_numports;
 204                 OK(len);
 205         default:
 206 err:
 207                 retval = -EPIPE;
 208         }
 209
 210         return retval;
 211 }