418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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* HWA Host Controller Driver
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* Wire Adapter Control/Data Streaming Iface (WUSB1.0[8])
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* This driver implements a USB Host Controller (struct usb_hcd) for a
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* Wireless USB Host Controller based on the Wireless USB 1.0
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* Host-Wire-Adapter specification (in layman terms, a USB-dongle that
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* implements a Wireless USB host).
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*
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* Check out the Design-overview.txt file in the source documentation
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* for other details on the implementation.
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*
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* Main blocks:
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*
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* driver glue with the driver API, workqueue daemon
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*
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* lc RC instance life cycle management (create, destroy...)
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*
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* hcd glue with the USB API Host Controller Interface API.
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*
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* nep Notification EndPoint managent: collect notifications
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* and queue them with the workqueue daemon.
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*
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* Handle notifications as coming from the NEP. Sends them
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* off others to their respective modules (eg: connect,
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* disconnect and reset go to devconnect).
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*
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* rpipe Remote Pipe management; rpipe is what we use to write
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* to an endpoint on a WUSB device that is connected to a
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* HWA RC.
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*
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* xfer Transfer management -- this is all the code that gets a
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* buffer and pushes it to a device (or viceversa). *
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*
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* Some day a lot of this code will be shared between this driver and
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* the drivers for DWA (xfer, rpipe).
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*
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* All starts at driver.c:hwahc_probe(), when one of this guys is
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* connected. hwahc_disconnect() stops it.
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*
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* During operation, the main driver is devices connecting or
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* disconnecting. They cause the HWA RC to send notifications into
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* nep.c:hwahc_nep_cb() that will dispatch them to
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* notif.c:wa_notif_dispatch(). From there they will fan to cause
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* device connects, disconnects, etc.
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*
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* Note much of the activity is difficult to follow. For example a
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* device connect goes to devconnect, which will cause the "fake" root
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* hub port to show a connect and stop there. Then khubd will notice
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* and call into the rh.c:hwahc_rc_port_reset() code to authenticate
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* the device (and this might require user intervention) and enable
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* the port.
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*
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* We also have a timer workqueue going from devconnect.c that
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* schedules in hwahc_devconnect_create().
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*
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* The rest of the traffic is in the usual entry points of a USB HCD,
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* which are hooked up in driver.c:hwahc_rc_driver, and defined in
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* hcd.c.
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*/
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#ifndef __HWAHC_INTERNAL_H__
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#define __HWAHC_INTERNAL_H__
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#include <linux/completion.h>
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#include <linux/usb.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/uwb.h>
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#include <linux/usb/wusb.h>
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#include <linux/usb/wusb-wa.h>
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struct wusbhc;
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struct wahc;
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extern void wa_urb_enqueue_run(struct work_struct *ws);
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/**
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* RPipe instance
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*
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* @descr's fields are kept in LE, as we need to send it back and
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* forth.
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*
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* @wa is referenced when set
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*
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* @segs_available is the number of requests segments that still can
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* be submitted to the controller without overloading
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* it. It is initialized to descr->wRequests when
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* aiming.
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*
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* A rpipe supports a max of descr->wRequests at the same time; before
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* submitting seg_lock has to be taken. If segs_avail > 0, then we can
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* submit; if not, we have to queue them.
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*/
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struct wa_rpipe {
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struct kref refcnt;
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struct usb_rpipe_descriptor descr;
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struct usb_host_endpoint *ep;
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struct wahc *wa;
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spinlock_t seg_lock;
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struct list_head seg_list;
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atomic_t segs_available;
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u8 buffer[1]; /* For reads/writes on USB */
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};
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/**
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* Instance of a HWA Host Controller
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*
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* Except where a more specific lock/mutex applies or atomic, all
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* fields protected by @mutex.
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*
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* @wa_descr Can be accessed without locking because it is in
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* the same area where the device descriptors were
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* read, so it is guaranteed to exist umodified while
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* the device exists.
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*
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* Endianess has been converted to CPU's.
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*
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* @nep_* can be accessed without locking as its processing is
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* serialized; we submit a NEP URB and it comes to
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* hwahc_nep_cb(), which won't issue another URB until it is
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* done processing it.
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*
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* @xfer_list:
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*
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* List of active transfers to verify existence from a xfer id
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* gotten from the xfer result message. Can't use urb->list because
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* it goes by endpoint, and we don't know the endpoint at the time
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* when we get the xfer result message. We can't really rely on the
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* pointer (will have to change for 64 bits) as the xfer id is 32 bits.
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*
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* @xfer_delayed_list: List of transfers that need to be started
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* (with a workqueue, because they were
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* submitted from an atomic context).
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*
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* FIXME: this needs to be layered up: a wusbhc layer (for sharing
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* comonalities with WHCI), a wa layer (for sharing
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* comonalities with DWA-RC).
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*/
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struct wahc {
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struct usb_device *usb_dev;
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struct usb_interface *usb_iface;
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/* HC to deliver notifications */
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union {
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struct wusbhc *wusb;
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struct dwahc *dwa;
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};
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const struct usb_endpoint_descriptor *dto_epd, *dti_epd;
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const struct usb_wa_descriptor *wa_descr;
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struct urb *nep_urb; /* Notification EndPoint [lockless] */
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struct edc nep_edc;
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void *nep_buffer;
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size_t nep_buffer_size;
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atomic_t notifs_queued;
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u16 rpipes;
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unsigned long *rpipe_bm; /* rpipe usage bitmap */
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spinlock_t rpipe_bm_lock; /* protect rpipe_bm */
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struct mutex rpipe_mutex; /* assigning resources to endpoints */
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struct urb *dti_urb; /* URB for reading xfer results */
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struct urb *buf_in_urb; /* URB for reading data in */
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struct edc dti_edc; /* DTI error density counter */
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struct wa_xfer_result *xfer_result; /* real size = dti_ep maxpktsize */
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size_t xfer_result_size;
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s32 status; /* For reading status */
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struct list_head xfer_list;
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struct list_head xfer_delayed_list;
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spinlock_t xfer_list_lock;
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struct work_struct xfer_work;
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atomic_t xfer_id_count;
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};
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extern int wa_create(struct wahc *wa, struct usb_interface *iface);
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extern void __wa_destroy(struct wahc *wa);
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void wa_reset_all(struct wahc *wa);
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/* Miscellaneous constants */
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enum {
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/** Max number of EPROTO errors we tolerate on the NEP in a
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* period of time */
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HWAHC_EPROTO_MAX = 16,
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/** Period of time for EPROTO errors (in jiffies) */
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HWAHC_EPROTO_PERIOD = 4 * HZ,
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};
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/* Notification endpoint handling */
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extern int wa_nep_create(struct wahc *, struct usb_interface *);
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extern void wa_nep_destroy(struct wahc *);
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static inline int wa_nep_arm(struct wahc *wa, gfp_t gfp_mask)
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{
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struct urb *urb = wa->nep_urb;
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urb->transfer_buffer = wa->nep_buffer;
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urb->transfer_buffer_length = wa->nep_buffer_size;
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return usb_submit_urb(urb, gfp_mask);
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}
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static inline void wa_nep_disarm(struct wahc *wa)
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{
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usb_kill_urb(wa->nep_urb);
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}
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/* RPipes */
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static inline void wa_rpipe_init(struct wahc *wa)
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{
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spin_lock_init(&wa->rpipe_bm_lock);
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mutex_init(&wa->rpipe_mutex);
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}
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static inline void wa_init(struct wahc *wa)
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{
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edc_init(&wa->nep_edc);
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atomic_set(&wa->notifs_queued, 0);
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wa_rpipe_init(wa);
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edc_init(&wa->dti_edc);
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INIT_LIST_HEAD(&wa->xfer_list);
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INIT_LIST_HEAD(&wa->xfer_delayed_list);
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spin_lock_init(&wa->xfer_list_lock);
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INIT_WORK(&wa->xfer_work, wa_urb_enqueue_run);
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atomic_set(&wa->xfer_id_count, 1);
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}
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/**
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* Destroy a pipe (when refcount drops to zero)
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*
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* Assumes it has been moved to the "QUIESCING" state.
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*/
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struct wa_xfer;
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extern void rpipe_destroy(struct kref *_rpipe);
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static inline
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void __rpipe_get(struct wa_rpipe *rpipe)
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{
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kref_get(&rpipe->refcnt);
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}
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extern int rpipe_get_by_ep(struct wahc *, struct usb_host_endpoint *,
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struct urb *, gfp_t);
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static inline void rpipe_put(struct wa_rpipe *rpipe)
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{
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kref_put(&rpipe->refcnt, rpipe_destroy);
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}
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extern void rpipe_ep_disable(struct wahc *, struct usb_host_endpoint *);
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extern int wa_rpipes_create(struct wahc *);
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extern void wa_rpipes_destroy(struct wahc *);
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static inline void rpipe_avail_dec(struct wa_rpipe *rpipe)
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{
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atomic_dec(&rpipe->segs_available);
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}
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/**
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* Returns true if the rpipe is ready to submit more segments.
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*/
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static inline int rpipe_avail_inc(struct wa_rpipe *rpipe)
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{
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return atomic_inc_return(&rpipe->segs_available) > 0
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&& !list_empty(&rpipe->seg_list);
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}
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/* Transferring data */
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extern int wa_urb_enqueue(struct wahc *, struct usb_host_endpoint *,
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struct urb *, gfp_t);
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extern int wa_urb_dequeue(struct wahc *, struct urb *);
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extern void wa_handle_notif_xfer(struct wahc *, struct wa_notif_hdr *);
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/* Misc
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*
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* FIXME: Refcounting for the actual @hwahc object is not correct; I
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* mean, this should be refcounting on the HCD underneath, but
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* it is not. In any case, the semantics for HCD refcounting
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* are *weird*...on refcount reaching zero it just frees
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* it...no RC specific function is called...unless I miss
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* something.
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*
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* FIXME: has to go away in favour of an 'struct' hcd based sollution
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*/
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static inline struct wahc *wa_get(struct wahc *wa)
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{
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usb_get_intf(wa->usb_iface);
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return wa;
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}
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static inline void wa_put(struct wahc *wa)
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{
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usb_put_intf(wa->usb_iface);
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}
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static inline int __wa_feature(struct wahc *wa, unsigned op, u16 feature)
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{
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return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
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op ? USB_REQ_SET_FEATURE : USB_REQ_CLEAR_FEATURE,
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USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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feature,
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wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
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NULL, 0, 1000 /* FIXME: arbitrary */);
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}
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static inline int __wa_set_feature(struct wahc *wa, u16 feature)
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{
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return __wa_feature(wa, 1, feature);
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}
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static inline int __wa_clear_feature(struct wahc *wa, u16 feature)
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{
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return __wa_feature(wa, 0, feature);
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}
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/**
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* Return the status of a Wire Adapter
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*
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* @wa: Wire Adapter instance
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* @returns < 0 errno code on error, or status bitmap as described
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* in WUSB1.0[8.3.1.6].
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*
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* NOTE: need malloc, some arches don't take USB from the stack
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*/
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static inline
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s32 __wa_get_status(struct wahc *wa)
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{
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s32 result;
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result = usb_control_msg(
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wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
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USB_REQ_GET_STATUS,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0, wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
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&wa->status, sizeof(wa->status),
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1000 /* FIXME: arbitrary */);
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if (result >= 0)
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result = wa->status;
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return result;
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}
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/**
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* Waits until the Wire Adapter's status matches @mask/@value
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*
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* @wa: Wire Adapter instance.
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* @returns < 0 errno code on error, otherwise status.
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*
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* Loop until the WAs status matches the mask and value (status & mask
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* == value). Timeout if it doesn't happen.
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*
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* FIXME: is there an official specification on how long status
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* changes can take?
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*/
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static inline s32 __wa_wait_status(struct wahc *wa, u32 mask, u32 value)
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{
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s32 result;
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unsigned loops = 10;
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do {
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msleep(50);
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result = __wa_get_status(wa);
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if ((result & mask) == value)
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break;
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if (loops-- == 0) {
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result = -ETIMEDOUT;
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break;
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}
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} while (result >= 0);
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return result;
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}
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/** Command @hwahc to stop, @returns 0 if ok, < 0 errno code on error */
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static inline int __wa_stop(struct wahc *wa)
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{
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int result;
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struct device *dev = &wa->usb_iface->dev;
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result = __wa_clear_feature(wa, WA_ENABLE);
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if (result < 0 && result != -ENODEV) {
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dev_err(dev, "error commanding HC to stop: %d\n", result);
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goto out;
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}
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result = __wa_wait_status(wa, WA_ENABLE, 0);
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if (result < 0 && result != -ENODEV)
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dev_err(dev, "error waiting for HC to stop: %d\n", result);
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out:
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return 0;
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}
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#endif /* #ifndef __HWAHC_INTERNAL_H__ */
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