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USB: add reset endpoint operations

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Wireless USB endpoint state has a sequence number and a current
window and not just a single toggle bit.  So allow HCDs to provide a
endpoint_reset method and call this or clear the software toggles as
required (after a clear halt, set configuration etc.).

usb_settoggle() and friends are then HCD internal and are moved into
core/hcd.h and all device drivers call usb_reset_endpoint() instead.

If the device endpoint state has been reset (with a clear halt) but
the host endpoint state has not then subsequent data transfers will
not complete. The device will only work again after it is reset or
disconnected.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Vrabel 2009-04-08 17:36:28 +00:00 committed by Greg Kroah-Hartman
parent d45e230bf0
commit 3444b26afa
10 changed files with 91 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/block/ub.c
View File

@ -1025,6 +1025,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
struct urb *urb = &sc->work_urb;
struct bulk_cs_wrap *bcs;
int endp;
int len;
int rc;
@ -1033,6 +1034,10 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
return;
}
endp = usb_pipeendpoint(sc->last_pipe);
if (usb_pipein(sc->last_pipe))
endp |= USB_DIR_IN;
if (cmd->state == UB_CMDST_CLEAR) {
if (urb->status == -EPIPE) {
/*
@ -1048,9 +1053,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
* We ignore the result for the halt clear.
*/
/* reset the endpoint toggle */
usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
usb_pipeout(sc->last_pipe), 0);
usb_reset_endpoint(sc->dev, endp);
ub_state_sense(sc, cmd);
@ -1065,9 +1068,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
* We ignore the result for the halt clear.
*/
/* reset the endpoint toggle */
usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
usb_pipeout(sc->last_pipe), 0);
usb_reset_endpoint(sc->dev, endp);
ub_state_stat(sc, cmd);
@ -1082,9 +1083,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
* We ignore the result for the halt clear.
*/
/* reset the endpoint toggle */
usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
usb_pipeout(sc->last_pipe), 0);
usb_reset_endpoint(sc->dev, endp);
ub_state_stat_counted(sc, cmd);
@ -2119,8 +2118,7 @@ static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe)
del_timer_sync(&timer);
usb_kill_urb(&sc->work_urb);
/* reset the endpoint toggle */
usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0);
usb_reset_endpoint(sc->dev, endp);
return 0;
}

9
drivers/isdn/hisax/st5481_usb.c
View File

@ -149,14 +149,7 @@ static void usb_ctrl_complete(struct urb *urb)
if (ctrl_msg->dr.bRequest == USB_REQ_CLEAR_FEATURE) {
/* Special case handling for pipe reset */
le16_to_cpus(&ctrl_msg->dr.wIndex);
/* toggle is reset on clear */
usb_settoggle(adapter->usb_dev,
ctrl_msg->dr.wIndex & ~USB_DIR_IN,
(ctrl_msg->dr.wIndex & USB_DIR_IN) == 0,
0);
usb_reset_endpoint(adapter->usb_dev, ctrl_msg->dr.wIndex);
}
if (ctrl_msg->complete)

1
drivers/media/video/pvrusb2/pvrusb2-hdw.c
View File

@ -1461,7 +1461,6 @@ static int pvr2_upload_firmware1(struct pvr2_hdw *hdw)
return ret;
}
usb_settoggle(hdw->usb_dev, 0 & 0xf, !(0 & USB_DIR_IN), 0);
usb_clear_halt(hdw->usb_dev, usb_sndbulkpipe(hdw->usb_dev, 0 & 0x7f));
pipe = usb_sndctrlpipe(hdw->usb_dev, 0);

2
drivers/usb/core/devio.c
View File

@ -841,7 +841,7 @@ static int proc_resetep(struct dev_state *ps, void __user *arg)
ret = checkintf(ps, ret);
if (ret)
return ret;
usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
usb_reset_endpoint(ps->dev, ep);
return 0;
}

26
drivers/usb/core/hcd.c
View File

@ -1539,6 +1539,32 @@ void usb_hcd_disable_endpoint(struct usb_device *udev,
hcd->driver->endpoint_disable(hcd, ep);
}
/**
* usb_hcd_reset_endpoint - reset host endpoint state
* @udev: USB device.
* @ep: the endpoint to reset.
*
* Resets any host endpoint state such as the toggle bit, sequence
* number and current window.
*/
void usb_hcd_reset_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
if (hcd->driver->endpoint_reset)
hcd->driver->endpoint_reset(hcd, ep);
else {
int epnum = usb_endpoint_num(&ep->desc);
int is_out = usb_endpoint_dir_out(&ep->desc);
int is_control = usb_endpoint_xfer_control(&ep->desc);
usb_settoggle(udev, epnum, is_out, 0);
if (is_control)
usb_settoggle(udev, epnum, !is_out, 0);
}
}
/* Protect against drivers that try to unlink URBs after the device
* is gone, by waiting until all unlinks for @udev are finished.
* Since we don't currently track URBs by device, simply wait until

14
drivers/usb/core/hcd.h
View File

@ -206,6 +206,11 @@ struct hc_driver {
void (*endpoint_disable)(struct usb_hcd *hcd,
struct usb_host_endpoint *ep);
/* (optional) reset any endpoint state such as sequence number
and current window */
void (*endpoint_reset)(struct usb_hcd *hcd,
struct usb_host_endpoint *ep);
/* root hub support */
int (*hub_status_data) (struct usb_hcd *hcd, char *buf);
int (*hub_control) (struct usb_hcd *hcd,
@ -234,6 +239,8 @@ extern void usb_hcd_flush_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep);
extern void usb_hcd_disable_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep);
extern void usb_hcd_reset_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep);
extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
extern int usb_hcd_get_frame_number(struct usb_device *udev);
@ -279,6 +286,13 @@ extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
extern void usb_hc_died(struct usb_hcd *hcd);
extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
#define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
#define usb_settoggle(dev, ep, out, bit) \
((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
((bit) << (ep)))
/* -------------------------------------------------------------------------- */
/* Enumeration is only for the hub driver, or HCD virtual root hubs */

58
drivers/usb/core/message.c
View File

@ -1002,8 +1002,7 @@ int usb_clear_halt(struct usb_device *dev, int pipe)
* the copy in usb-storage, for as long as we need two copies.
*/
/* toggle was reset by the clear */
usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
usb_reset_endpoint(dev, endp);
return 0;
}
@ -1075,6 +1074,30 @@ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
}
}
/**
* usb_reset_endpoint - Reset an endpoint's state.
* @dev: the device whose endpoint is to be reset
* @epaddr: the endpoint's address. Endpoint number for output,
* endpoint number + USB_DIR_IN for input
*
* Resets any host-side endpoint state such as the toggle bit,
* sequence number or current window.
*/
void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr)
{
unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK;
struct usb_host_endpoint *ep;
if (usb_endpoint_out(epaddr))
ep = dev->ep_out[epnum];
else
ep = dev->ep_in[epnum];
if (ep)
usb_hcd_reset_endpoint(dev, ep);
}
EXPORT_SYMBOL_GPL(usb_reset_endpoint);
/**
* usb_disable_interface -- Disable all endpoints for an interface
* @dev: the device whose interface is being disabled
@ -1117,7 +1140,6 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
usb_disable_endpoint(dev, i, true);
usb_disable_endpoint(dev, i + USB_DIR_IN, true);
}
dev->toggle[0] = dev->toggle[1] = 0;
/* getting rid of interfaces will disconnect
* any drivers bound to them (a key side effect)
@ -1154,28 +1176,24 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
* usb_enable_endpoint - Enable an endpoint for USB communications
* @dev: the device whose interface is being enabled
* @ep: the endpoint
* @reset_toggle: flag to set the endpoint's toggle back to 0
* @reset_ep: flag to reset the endpoint state
*
* Resets the endpoint toggle if asked, and sets dev->ep_{in,out} pointers.
* Resets the endpoint state if asked, and sets dev->ep_{in,out} pointers.
* For control endpoints, both the input and output sides are handled.
*/
void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep,
bool reset_toggle)
bool reset_ep)
{
int epnum = usb_endpoint_num(&ep->desc);
int is_out = usb_endpoint_dir_out(&ep->desc);
int is_control = usb_endpoint_xfer_control(&ep->desc);
if (is_out || is_control) {
if (reset_toggle)
usb_settoggle(dev, epnum, 1, 0);
if (reset_ep)
usb_hcd_reset_endpoint(dev, ep);
if (is_out || is_control)
dev->ep_out[epnum] = ep;
}
if (!is_out || is_control) {
if (reset_toggle)
usb_settoggle(dev, epnum, 0, 0);
if (!is_out || is_control)
dev->ep_in[epnum] = ep;
}
ep->enabled = 1;
}
@ -1183,18 +1201,18 @@ void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep,
* usb_enable_interface - Enable all the endpoints for an interface
* @dev: the device whose interface is being enabled
* @intf: pointer to the interface descriptor
* @reset_toggles: flag to set the endpoints' toggles back to 0
* @reset_eps: flag to reset the endpoints' state
*
* Enables all the endpoints for the interface's current altsetting.
*/
void usb_enable_interface(struct usb_device *dev,
struct usb_interface *intf, bool reset_toggles)
struct usb_interface *intf, bool reset_eps)
{
struct usb_host_interface *alt = intf->cur_altsetting;
int i;
for (i = 0; i < alt->desc.bNumEndpoints; ++i)
usb_enable_endpoint(dev, &alt->endpoint[i], reset_toggles);
usb_enable_endpoint(dev, &alt->endpoint[i], reset_eps);
}
/**
@ -1335,7 +1353,7 @@ EXPORT_SYMBOL_GPL(usb_set_interface);
* This issues a standard SET_CONFIGURATION request to the device using
* the current configuration. The effect is to reset most USB-related
* state in the device, including interface altsettings (reset to zero),
* endpoint halts (cleared), and data toggle (only for bulk and interrupt
* endpoint halts (cleared), and endpoint state (only for bulk and interrupt
* endpoints). Other usbcore state is unchanged, including bindings of
* usb device drivers to interfaces.
*
@ -1343,7 +1361,7 @@ EXPORT_SYMBOL_GPL(usb_set_interface);
* (multi-interface) devices. Instead, the driver for each interface may
* use usb_set_interface() on the interfaces it claims. Be careful though;
* some devices don't support the SET_INTERFACE request, and others won't
* reset all the interface state (notably data toggles). Resetting the whole
* reset all the interface state (notably endpoint state). Resetting the whole
* configuration would affect other drivers' interfaces.
*
* The caller must own the device lock.
@ -1376,8 +1394,6 @@ int usb_reset_configuration(struct usb_device *dev)
if (retval < 0)
return retval;
dev->toggle[0] = dev->toggle[1] = 0;
/* re-init hc/hcd interface/endpoint state */
for (i = 0; i < config->desc.bNumInterfaces; i++) {
struct usb_interface *intf = config->interface[i];

2
drivers/usb/core/usb.c
View File

@ -362,7 +362,7 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
/* ep0 maxpacket comes later, from device descriptor */
usb_enable_endpoint(dev, &dev->ep0, true);
usb_enable_endpoint(dev, &dev->ep0, false);
dev->can_submit = 1;
/* Save readable and stable topology id, distinguishing devices

4
drivers/usb/storage/transport.c
View File

@ -247,10 +247,8 @@ int usb_stor_clear_halt(struct us_data *us, unsigned int pipe)
USB_ENDPOINT_HALT, endp,
NULL, 0, 3*HZ);
/* reset the endpoint toggle */
if (result >= 0)
usb_settoggle(us->pusb_dev, usb_pipeendpoint(pipe),
usb_pipeout(pipe), 0);
usb_reset_endpoint(us->pusb_dev, endp);
US_DEBUGP("%s: result = %d\n", __func__, result);
return result;

9
include/linux/usb.h
View File

@ -1387,6 +1387,7 @@ extern int usb_string(struct usb_device *dev, int index,
extern int usb_clear_halt(struct usb_device *dev, int pipe);
extern int usb_reset_configuration(struct usb_device *dev);
extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr);
/* this request isn't really synchronous, but it belongs with the others */
extern int usb_driver_set_configuration(struct usb_device *udev, int config);
@ -1491,14 +1492,6 @@ void usb_sg_wait(struct usb_sg_request *io);
#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
#define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
#define usb_settoggle(dev, ep, out, bit) \
((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
((bit) << (ep)))
static inline unsigned int __create_pipe(struct usb_device *dev,
unsigned int endpoint)
{