/* * usb_enable_endpoint - Enable an endpoint for USB communications * @dev: the device whose interface is being enabled * @ep: the endpoint * * Resets the endpoint toggle, and sets dev->ep_{in,out} pointers. * For control endpoints, both the input and output sides are handled. */ static void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep) { unsigned int epaddr = ep->desc.bEndpointAddress; unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; int is_control; is_control = ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_CONTROL); if (usb_endpoint_out(epaddr) || is_control) { usb_settoggle(dev, epnum, 1, 0); dev->ep_out[epnum] = ep; } if (!usb_endpoint_out(epaddr) || is_control) { usb_settoggle(dev, epnum, 0, 0); dev->ep_in[epnum] = ep; } }
/* * usb_enable_endpoint - Enable an endpoint for USB communications * @dev: the device whose interface is being enabled * @epd: pointer to the endpoint descriptor * * Marks the endpoint as running, resets its toggle, and stores * its maxpacket value. For control endpoints, both the input * and output sides are handled. */ void usb_enable_endpoint(struct usb_device *dev, struct usb_endpoint_descriptor *epd) { int maxsize = epd->wMaxPacketSize; unsigned int epaddr = epd->bEndpointAddress; unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; int is_control = ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_CONTROL); if (usb_endpoint_out(epaddr) || is_control) { usb_endpoint_running(dev, epnum, 1); usb_settoggle(dev, epnum, 1, 0); dev->epmaxpacketout[epnum] = maxsize; } if (!usb_endpoint_out(epaddr) || is_control) { usb_endpoint_running(dev, epnum, 0); usb_settoggle(dev, epnum, 0, 0); dev->epmaxpacketin[epnum] = maxsize; } }
static void xhci_dbg_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int last_ep) { int i, j; int last_ep_ctx = 31; /* Fields are 32 bits wide, DMA addresses are in bytes */ int field_size = 32 / 8; int csz = HCC_64BYTE_CONTEXT(xhci->hcc_params); if (last_ep < 31) last_ep_ctx = last_ep + 1; for (i = 0; i < last_ep_ctx; ++i) { unsigned int epaddr = xhci_get_endpoint_address(i); struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, ctx, i); dma_addr_t dma = ctx->dma + ((unsigned long)ep_ctx - (unsigned long)ctx->bytes); xhci_dbg(xhci, "%s Endpoint %02d Context (ep_index %02d):\n", usb_endpoint_out(epaddr) ? "OUT" : "IN", epaddr & USB_ENDPOINT_NUMBER_MASK, i); xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - ep_info\n", &ep_ctx->ep_info, (unsigned long long)dma, ep_ctx->ep_info); dma += field_size; xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - ep_info2\n", &ep_ctx->ep_info2, (unsigned long long)dma, ep_ctx->ep_info2); dma += field_size; xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08llx - deq\n", &ep_ctx->deq, (unsigned long long)dma, ep_ctx->deq); dma += 2*field_size; xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - tx_info\n", &ep_ctx->tx_info, (unsigned long long)dma, ep_ctx->tx_info); dma += field_size; for (j = 0; j < 3; ++j) { xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - rsvd[%d]\n", &ep_ctx->reserved[j], (unsigned long long)dma, ep_ctx->reserved[j], j); dma += field_size; } if (csz) dbg_rsvd64(xhci, (u64 *)ep_ctx, dma); } }
/** * usb_disable_endpoint -- Disable an endpoint by address * @dev: the device whose endpoint is being disabled * @epaddr: the endpoint's address. Endpoint number for output, * endpoint number + USB_DIR_IN for input * * Deallocates hcd/hardware state for this endpoint ... and nukes all * pending urbs. * * If the HCD hasn't registered a disable() function, this marks the * endpoint as halted and sets its maxpacket size to 0 to prevent * further submissions. */ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr) { if (dev && dev->bus && dev->bus->op && dev->bus->op->disable) dev->bus->op->disable(dev, epaddr); else { unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; if (usb_endpoint_out(epaddr)) { usb_endpoint_halt(dev, epnum, 1); dev->epmaxpacketout[epnum] = 0; } else { usb_endpoint_halt(dev, epnum, 0); dev->epmaxpacketin[epnum] = 0; } } }
/** * usb_disable_endpoint -- Disable an endpoint by address * @dev: the device whose endpoint is being disabled * @epaddr: the endpoint's address. Endpoint number for output, * endpoint number + USB_DIR_IN for input * * Deallocates hcd/hardware state for this endpoint ... and nukes all * pending urbs. * * If the HCD hasn't registered a disable() function, this sets the * endpoint's maxpacket size to 0 to prevent further submissions. */ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr) { unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; struct usb_host_endpoint *ep; if (!dev) return; if (usb_endpoint_out(epaddr)) { ep = dev->ep_out[epnum]; dev->ep_out[epnum] = NULL; } else { ep = dev->ep_in[epnum]; dev->ep_in[epnum] = NULL; } if (ep && dev->bus) usb_hcd_endpoint_disable(dev, ep); }
/** * usb_set_interface - Makes a particular alternate setting be current * @dev: the device whose interface is being updated * @interface: the interface being updated * @alternate: the setting being chosen. * Context: !in_interrupt () * * This is used to enable data transfers on interfaces that may not * be enabled by default. Not all devices support such configurability. * Only the driver bound to an interface may change its setting. * * Within any given configuration, each interface may have several * alternative settings. These are often used to control levels of * bandwidth consumption. For example, the default setting for a high * speed interrupt endpoint may not send more than 64 bytes per microframe, * while interrupt transfers of up to 3KBytes per microframe are legal. * Also, isochronous endpoints may never be part of an * interface's default setting. To access such bandwidth, alternate * interface settings must be made current. * * Note that in the Linux USB subsystem, bandwidth associated with * an endpoint in a given alternate setting is not reserved until an URB * is submitted that needs that bandwidth. Some other operating systems * allocate bandwidth early, when a configuration is chosen. * * This call is synchronous, and may not be used in an interrupt context. * Also, drivers must not change altsettings while urbs are scheduled for * endpoints in that interface; all such urbs must first be completed * (perhaps forced by unlinking). * * Returns zero on success, or else the status code returned by the * underlying usb_control_msg() call. */ int usb_set_interface(struct usb_device *dev, int interface, int alternate) { struct usb_interface *iface; struct usb_host_interface *alt; int ret; int manual = 0; iface = usb_ifnum_to_if(dev, interface); if (!iface) { dev_dbg(&dev->dev, "selecting invalid interface %d\n", interface); return -EINVAL; } alt = usb_altnum_to_altsetting(iface, alternate); if (!alt) { warn("selecting invalid altsetting %d", alternate); return -EINVAL; } ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, alternate, interface, NULL, 0, HZ * 5); /* 9.4.10 says devices don't need this and are free to STALL the * request if the interface only has one alternate setting. */ if (ret == -EPIPE && iface->num_altsetting == 1) { dev_dbg(&dev->dev, "manual set_interface for iface %d, alt %d\n", interface, alternate); manual = 1; } else if (ret < 0) return ret; /* FIXME drivers shouldn't need to replicate/bugfix the logic here * when they implement async or easily-killable versions of this or * other "should-be-internal" functions (like clear_halt). * should hcd+usbcore postprocess control requests? */ /* prevent submissions using previous endpoint settings */ usb_disable_interface(dev, iface); iface->cur_altsetting = alt; /* If the interface only has one altsetting and the device didn't * accept the request, we attempt to carry out the equivalent action * by manually clearing the HALT feature for each endpoint in the * new altsetting. */ if (manual) { int i; for (i = 0; i < alt->desc.bNumEndpoints; i++) { unsigned int epaddr = alt->endpoint[i].desc.bEndpointAddress; unsigned int pipe = __create_pipe(dev, USB_ENDPOINT_NUMBER_MASK & epaddr) | (usb_endpoint_out(epaddr) ? USB_DIR_OUT : USB_DIR_IN); usb_clear_halt(dev, pipe); } } /* 9.1.1.5: reset toggles for all endpoints in the new altsetting * * Note: * Despite EP0 is always present in all interfaces/AS, the list of * endpoints from the descriptor does not contain EP0. Due to its * omnipresence one might expect EP0 being considered "affected" by * any SetInterface request and hence assume toggles need to be reset. * However, EP0 toggles are re-synced for every individual transfer * during the SETUP stage - hence EP0 toggles are "don't care" here. * (Likewise, EP0 never "halts" on well designed devices.) */ usb_enable_interface(dev, iface); return 0; }
/** * usb_set_interface - Makes a particular alternate setting be current * @dev: the device whose interface is being updated * @interface: the interface being updated * @alternate: the setting being chosen. * Context: !in_interrupt () * * This is used to enable data transfers on interfaces that may not * be enabled by default. Not all devices support such configurability. * Only the driver bound to an interface may change its setting. * * Within any given configuration, each interface may have several * alternative settings. These are often used to control levels of * bandwidth consumption. For example, the default setting for a high * speed interrupt endpoint may not send more than 64 bytes per microframe, * while interrupt transfers of up to 3KBytes per microframe are legal. * Also, isochronous endpoints may never be part of an * interface's default setting. To access such bandwidth, alternate * interface settings must be made current. * * Note that in the Linux USB subsystem, bandwidth associated with * an endpoint in a given alternate setting is not reserved until an URB * is submitted that needs that bandwidth. Some other operating systems * allocate bandwidth early, when a configuration is chosen. * * This call is synchronous, and may not be used in an interrupt context. * Also, drivers must not change altsettings while urbs are scheduled for * endpoints in that interface; all such urbs must first be completed * (perhaps forced by unlinking). * * Returns zero on success, or else the status code returned by the * underlying usb_control_msg() call. */ int usb_set_interface(struct usb_device *dev, int interface, int alternate) { struct usb_interface *iface; struct usb_host_interface *alt; int ret; int manual = 0; if (dev->state == USB_STATE_SUSPENDED) return -EHOSTUNREACH; iface = usb_ifnum_to_if(dev, interface); if (!iface) { dev_dbg(&dev->dev, "selecting invalid interface %d\n", interface); return -EINVAL; } alt = usb_altnum_to_altsetting(iface, alternate); if (!alt) { warn("selecting invalid altsetting %d", alternate); return -EINVAL; } ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, alternate, interface, NULL, 0, 5000); /* 9.4.10 says devices don't need this and are free to STALL the * request if the interface only has one alternate setting. */ if (ret == -EPIPE && iface->num_altsetting == 1) { dev_dbg(&dev->dev, "manual set_interface for iface %d, alt %d\n", interface, alternate); manual = 1; } else if (ret < 0) return ret; /* FIXME drivers shouldn't need to replicate/bugfix the logic here * when they implement async or easily-killable versions of this or * other "should-be-internal" functions (like clear_halt). * should hcd+usbcore postprocess control requests? */ /* prevent submissions using previous endpoint settings */ usb_disable_interface(dev, iface); /* 9.1.1.5 says: * * Configuring a device or changing an alternate setting * causes all of the status and configuration values * associated with endpoints in the affected interfaces to * be set to their default values. This includes setting * the data toggle of any endpoint using data toggles to * the value DATA0. * * Some devices take this too literally and don't reset the data * toggles if the new altsetting is the same as the old one (the * command isn't "changing" an alternate setting). We will manually * reset the toggles when the new and old altsettings are the same. * Most devices won't need this, but fortunately it doesn't happen * often. */ if (iface->cur_altsetting == alt) manual = 1; iface->cur_altsetting = alt; /* If the interface only has one altsetting and the device didn't * accept the request (or whenever the old altsetting is the same * as the new one), we attempt to carry out the equivalent action * by manually clearing the HALT feature for each endpoint in the * new altsetting. */ if (manual) { int i; for (i = 0; i < alt->desc.bNumEndpoints; i++) { unsigned int epaddr = alt->endpoint[i].desc.bEndpointAddress; unsigned int pipe = __create_pipe(dev, USB_ENDPOINT_NUMBER_MASK & epaddr) | (usb_endpoint_out(epaddr) ? USB_DIR_OUT : USB_DIR_IN); usb_clear_halt(dev, pipe); } } /* 9.1.1.5: reset toggles for all endpoints in the new altsetting * * Note: * Despite EP0 is always present in all interfaces/AS, the list of * endpoints from the descriptor does not contain EP0. Due to its * omnipresence one might expect EP0 being considered "affected" by * any SetInterface request and hence assume toggles need to be reset. * However, EP0 toggles are re-synced for every individual transfer * during the SETUP stage - hence EP0 toggles are "don't care" here. * (Likewise, EP0 never "halts" on well designed devices.) */ usb_enable_interface(dev, iface); return 0; }