mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
37ebb54915
USB hub has started to use a workqueue instead of kthread. Let's update the documentation and comments here and there. This patch mostly just replaces "khubd" with "hub_wq". There are only few exceptions where the whole sentence was updated. These more complicated changes can be found in the following files: Documentation/usb/hotplug.txt drivers/net/usb/usbnet.c drivers/usb/core/hcd.c drivers/usb/host/ohci-hcd.c drivers/usb/host/xhci.c Signed-off-by: Petr Mladek <pmladek@suse.cz> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
482 lines
14 KiB
C
482 lines
14 KiB
C
/*
|
|
* HWA Host Controller Driver
|
|
* Wire Adapter Control/Data Streaming Iface (WUSB1.0[8])
|
|
*
|
|
* Copyright (C) 2005-2006 Intel Corporation
|
|
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*
|
|
*
|
|
* This driver implements a USB Host Controller (struct usb_hcd) for a
|
|
* Wireless USB Host Controller based on the Wireless USB 1.0
|
|
* Host-Wire-Adapter specification (in layman terms, a USB-dongle that
|
|
* implements a Wireless USB host).
|
|
*
|
|
* Check out the Design-overview.txt file in the source documentation
|
|
* for other details on the implementation.
|
|
*
|
|
* Main blocks:
|
|
*
|
|
* driver glue with the driver API, workqueue daemon
|
|
*
|
|
* lc RC instance life cycle management (create, destroy...)
|
|
*
|
|
* hcd glue with the USB API Host Controller Interface API.
|
|
*
|
|
* nep Notification EndPoint management: collect notifications
|
|
* and queue them with the workqueue daemon.
|
|
*
|
|
* Handle notifications as coming from the NEP. Sends them
|
|
* off others to their respective modules (eg: connect,
|
|
* disconnect and reset go to devconnect).
|
|
*
|
|
* rpipe Remote Pipe management; rpipe is what we use to write
|
|
* to an endpoint on a WUSB device that is connected to a
|
|
* HWA RC.
|
|
*
|
|
* xfer Transfer management -- this is all the code that gets a
|
|
* buffer and pushes it to a device (or viceversa). *
|
|
*
|
|
* Some day a lot of this code will be shared between this driver and
|
|
* the drivers for DWA (xfer, rpipe).
|
|
*
|
|
* All starts at driver.c:hwahc_probe(), when one of this guys is
|
|
* connected. hwahc_disconnect() stops it.
|
|
*
|
|
* During operation, the main driver is devices connecting or
|
|
* disconnecting. They cause the HWA RC to send notifications into
|
|
* nep.c:hwahc_nep_cb() that will dispatch them to
|
|
* notif.c:wa_notif_dispatch(). From there they will fan to cause
|
|
* device connects, disconnects, etc.
|
|
*
|
|
* Note much of the activity is difficult to follow. For example a
|
|
* device connect goes to devconnect, which will cause the "fake" root
|
|
* hub port to show a connect and stop there. Then hub_wq will notice
|
|
* and call into the rh.c:hwahc_rc_port_reset() code to authenticate
|
|
* the device (and this might require user intervention) and enable
|
|
* the port.
|
|
*
|
|
* We also have a timer workqueue going from devconnect.c that
|
|
* schedules in hwahc_devconnect_create().
|
|
*
|
|
* The rest of the traffic is in the usual entry points of a USB HCD,
|
|
* which are hooked up in driver.c:hwahc_rc_driver, and defined in
|
|
* hcd.c.
|
|
*/
|
|
|
|
#ifndef __HWAHC_INTERNAL_H__
|
|
#define __HWAHC_INTERNAL_H__
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/uwb.h>
|
|
#include <linux/usb/wusb.h>
|
|
#include <linux/usb/wusb-wa.h>
|
|
|
|
struct wusbhc;
|
|
struct wahc;
|
|
extern void wa_urb_enqueue_run(struct work_struct *ws);
|
|
extern void wa_process_errored_transfers_run(struct work_struct *ws);
|
|
|
|
/**
|
|
* RPipe instance
|
|
*
|
|
* @descr's fields are kept in LE, as we need to send it back and
|
|
* forth.
|
|
*
|
|
* @wa is referenced when set
|
|
*
|
|
* @segs_available is the number of requests segments that still can
|
|
* be submitted to the controller without overloading
|
|
* it. It is initialized to descr->wRequests when
|
|
* aiming.
|
|
*
|
|
* A rpipe supports a max of descr->wRequests at the same time; before
|
|
* submitting seg_lock has to be taken. If segs_avail > 0, then we can
|
|
* submit; if not, we have to queue them.
|
|
*/
|
|
struct wa_rpipe {
|
|
struct kref refcnt;
|
|
struct usb_rpipe_descriptor descr;
|
|
struct usb_host_endpoint *ep;
|
|
struct wahc *wa;
|
|
spinlock_t seg_lock;
|
|
struct list_head seg_list;
|
|
struct list_head list_node;
|
|
atomic_t segs_available;
|
|
u8 buffer[1]; /* For reads/writes on USB */
|
|
};
|
|
|
|
|
|
enum wa_dti_state {
|
|
WA_DTI_TRANSFER_RESULT_PENDING,
|
|
WA_DTI_ISOC_PACKET_STATUS_PENDING,
|
|
WA_DTI_BUF_IN_DATA_PENDING
|
|
};
|
|
|
|
enum wa_quirks {
|
|
/*
|
|
* The Alereon HWA expects the data frames in isochronous transfer
|
|
* requests to be concatenated and not sent as separate packets.
|
|
*/
|
|
WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC = 0x01,
|
|
/*
|
|
* The Alereon HWA can be instructed to not send transfer notifications
|
|
* as an optimization.
|
|
*/
|
|
WUSB_QUIRK_ALEREON_HWA_DISABLE_XFER_NOTIFICATIONS = 0x02,
|
|
};
|
|
|
|
enum wa_vendor_specific_requests {
|
|
WA_REQ_ALEREON_DISABLE_XFER_NOTIFICATIONS = 0x4C,
|
|
WA_REQ_ALEREON_FEATURE_SET = 0x01,
|
|
WA_REQ_ALEREON_FEATURE_CLEAR = 0x00,
|
|
};
|
|
|
|
#define WA_MAX_BUF_IN_URBS 4
|
|
/**
|
|
* Instance of a HWA Host Controller
|
|
*
|
|
* Except where a more specific lock/mutex applies or atomic, all
|
|
* fields protected by @mutex.
|
|
*
|
|
* @wa_descr Can be accessed without locking because it is in
|
|
* the same area where the device descriptors were
|
|
* read, so it is guaranteed to exist unmodified while
|
|
* the device exists.
|
|
*
|
|
* Endianess has been converted to CPU's.
|
|
*
|
|
* @nep_* can be accessed without locking as its processing is
|
|
* serialized; we submit a NEP URB and it comes to
|
|
* hwahc_nep_cb(), which won't issue another URB until it is
|
|
* done processing it.
|
|
*
|
|
* @xfer_list:
|
|
*
|
|
* List of active transfers to verify existence from a xfer id
|
|
* gotten from the xfer result message. Can't use urb->list because
|
|
* it goes by endpoint, and we don't know the endpoint at the time
|
|
* when we get the xfer result message. We can't really rely on the
|
|
* pointer (will have to change for 64 bits) as the xfer id is 32 bits.
|
|
*
|
|
* @xfer_delayed_list: List of transfers that need to be started
|
|
* (with a workqueue, because they were
|
|
* submitted from an atomic context).
|
|
*
|
|
* FIXME: this needs to be layered up: a wusbhc layer (for sharing
|
|
* commonalities with WHCI), a wa layer (for sharing
|
|
* commonalities with DWA-RC).
|
|
*/
|
|
struct wahc {
|
|
struct usb_device *usb_dev;
|
|
struct usb_interface *usb_iface;
|
|
|
|
/* HC to deliver notifications */
|
|
union {
|
|
struct wusbhc *wusb;
|
|
struct dwahc *dwa;
|
|
};
|
|
|
|
const struct usb_endpoint_descriptor *dto_epd, *dti_epd;
|
|
const struct usb_wa_descriptor *wa_descr;
|
|
|
|
struct urb *nep_urb; /* Notification EndPoint [lockless] */
|
|
struct edc nep_edc;
|
|
void *nep_buffer;
|
|
size_t nep_buffer_size;
|
|
|
|
atomic_t notifs_queued;
|
|
|
|
u16 rpipes;
|
|
unsigned long *rpipe_bm; /* rpipe usage bitmap */
|
|
struct list_head rpipe_delayed_list; /* delayed RPIPES. */
|
|
spinlock_t rpipe_lock; /* protect rpipe_bm and delayed list */
|
|
struct mutex rpipe_mutex; /* assigning resources to endpoints */
|
|
|
|
/*
|
|
* dti_state is used to track the state of the dti_urb. When dti_state
|
|
* is WA_DTI_ISOC_PACKET_STATUS_PENDING, dti_isoc_xfer_in_progress and
|
|
* dti_isoc_xfer_seg identify which xfer the incoming isoc packet
|
|
* status refers to.
|
|
*/
|
|
enum wa_dti_state dti_state;
|
|
u32 dti_isoc_xfer_in_progress;
|
|
u8 dti_isoc_xfer_seg;
|
|
struct urb *dti_urb; /* URB for reading xfer results */
|
|
/* URBs for reading data in */
|
|
struct urb buf_in_urbs[WA_MAX_BUF_IN_URBS];
|
|
int active_buf_in_urbs; /* number of buf_in_urbs active. */
|
|
struct edc dti_edc; /* DTI error density counter */
|
|
void *dti_buf;
|
|
size_t dti_buf_size;
|
|
|
|
unsigned long dto_in_use; /* protect dto endoint serialization */
|
|
|
|
s32 status; /* For reading status */
|
|
|
|
struct list_head xfer_list;
|
|
struct list_head xfer_delayed_list;
|
|
struct list_head xfer_errored_list;
|
|
/*
|
|
* lock for the above xfer lists. Can be taken while a xfer->lock is
|
|
* held but not in the reverse order.
|
|
*/
|
|
spinlock_t xfer_list_lock;
|
|
struct work_struct xfer_enqueue_work;
|
|
struct work_struct xfer_error_work;
|
|
atomic_t xfer_id_count;
|
|
|
|
kernel_ulong_t quirks;
|
|
};
|
|
|
|
|
|
extern int wa_create(struct wahc *wa, struct usb_interface *iface,
|
|
kernel_ulong_t);
|
|
extern void __wa_destroy(struct wahc *wa);
|
|
extern int wa_dti_start(struct wahc *wa);
|
|
void wa_reset_all(struct wahc *wa);
|
|
|
|
|
|
/* Miscellaneous constants */
|
|
enum {
|
|
/** Max number of EPROTO errors we tolerate on the NEP in a
|
|
* period of time */
|
|
HWAHC_EPROTO_MAX = 16,
|
|
/** Period of time for EPROTO errors (in jiffies) */
|
|
HWAHC_EPROTO_PERIOD = 4 * HZ,
|
|
};
|
|
|
|
|
|
/* Notification endpoint handling */
|
|
extern int wa_nep_create(struct wahc *, struct usb_interface *);
|
|
extern void wa_nep_destroy(struct wahc *);
|
|
|
|
static inline int wa_nep_arm(struct wahc *wa, gfp_t gfp_mask)
|
|
{
|
|
struct urb *urb = wa->nep_urb;
|
|
urb->transfer_buffer = wa->nep_buffer;
|
|
urb->transfer_buffer_length = wa->nep_buffer_size;
|
|
return usb_submit_urb(urb, gfp_mask);
|
|
}
|
|
|
|
static inline void wa_nep_disarm(struct wahc *wa)
|
|
{
|
|
usb_kill_urb(wa->nep_urb);
|
|
}
|
|
|
|
|
|
/* RPipes */
|
|
static inline void wa_rpipe_init(struct wahc *wa)
|
|
{
|
|
INIT_LIST_HEAD(&wa->rpipe_delayed_list);
|
|
spin_lock_init(&wa->rpipe_lock);
|
|
mutex_init(&wa->rpipe_mutex);
|
|
}
|
|
|
|
static inline void wa_init(struct wahc *wa)
|
|
{
|
|
int index;
|
|
|
|
edc_init(&wa->nep_edc);
|
|
atomic_set(&wa->notifs_queued, 0);
|
|
wa->dti_state = WA_DTI_TRANSFER_RESULT_PENDING;
|
|
wa_rpipe_init(wa);
|
|
edc_init(&wa->dti_edc);
|
|
INIT_LIST_HEAD(&wa->xfer_list);
|
|
INIT_LIST_HEAD(&wa->xfer_delayed_list);
|
|
INIT_LIST_HEAD(&wa->xfer_errored_list);
|
|
spin_lock_init(&wa->xfer_list_lock);
|
|
INIT_WORK(&wa->xfer_enqueue_work, wa_urb_enqueue_run);
|
|
INIT_WORK(&wa->xfer_error_work, wa_process_errored_transfers_run);
|
|
wa->dto_in_use = 0;
|
|
atomic_set(&wa->xfer_id_count, 1);
|
|
/* init the buf in URBs */
|
|
for (index = 0; index < WA_MAX_BUF_IN_URBS; ++index)
|
|
usb_init_urb(&(wa->buf_in_urbs[index]));
|
|
wa->active_buf_in_urbs = 0;
|
|
}
|
|
|
|
/**
|
|
* Destroy a pipe (when refcount drops to zero)
|
|
*
|
|
* Assumes it has been moved to the "QUIESCING" state.
|
|
*/
|
|
struct wa_xfer;
|
|
extern void rpipe_destroy(struct kref *_rpipe);
|
|
static inline
|
|
void __rpipe_get(struct wa_rpipe *rpipe)
|
|
{
|
|
kref_get(&rpipe->refcnt);
|
|
}
|
|
extern int rpipe_get_by_ep(struct wahc *, struct usb_host_endpoint *,
|
|
struct urb *, gfp_t);
|
|
static inline void rpipe_put(struct wa_rpipe *rpipe)
|
|
{
|
|
kref_put(&rpipe->refcnt, rpipe_destroy);
|
|
|
|
}
|
|
extern void rpipe_ep_disable(struct wahc *, struct usb_host_endpoint *);
|
|
extern void rpipe_clear_feature_stalled(struct wahc *,
|
|
struct usb_host_endpoint *);
|
|
extern int wa_rpipes_create(struct wahc *);
|
|
extern void wa_rpipes_destroy(struct wahc *);
|
|
static inline void rpipe_avail_dec(struct wa_rpipe *rpipe)
|
|
{
|
|
atomic_dec(&rpipe->segs_available);
|
|
}
|
|
|
|
/**
|
|
* Returns true if the rpipe is ready to submit more segments.
|
|
*/
|
|
static inline int rpipe_avail_inc(struct wa_rpipe *rpipe)
|
|
{
|
|
return atomic_inc_return(&rpipe->segs_available) > 0
|
|
&& !list_empty(&rpipe->seg_list);
|
|
}
|
|
|
|
|
|
/* Transferring data */
|
|
extern int wa_urb_enqueue(struct wahc *, struct usb_host_endpoint *,
|
|
struct urb *, gfp_t);
|
|
extern int wa_urb_dequeue(struct wahc *, struct urb *, int);
|
|
extern void wa_handle_notif_xfer(struct wahc *, struct wa_notif_hdr *);
|
|
|
|
|
|
/* Misc
|
|
*
|
|
* FIXME: Refcounting for the actual @hwahc object is not correct; I
|
|
* mean, this should be refcounting on the HCD underneath, but
|
|
* it is not. In any case, the semantics for HCD refcounting
|
|
* are *weird*...on refcount reaching zero it just frees
|
|
* it...no RC specific function is called...unless I miss
|
|
* something.
|
|
*
|
|
* FIXME: has to go away in favour of a 'struct' hcd based solution
|
|
*/
|
|
static inline struct wahc *wa_get(struct wahc *wa)
|
|
{
|
|
usb_get_intf(wa->usb_iface);
|
|
return wa;
|
|
}
|
|
|
|
static inline void wa_put(struct wahc *wa)
|
|
{
|
|
usb_put_intf(wa->usb_iface);
|
|
}
|
|
|
|
|
|
static inline int __wa_feature(struct wahc *wa, unsigned op, u16 feature)
|
|
{
|
|
return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
|
|
op ? USB_REQ_SET_FEATURE : USB_REQ_CLEAR_FEATURE,
|
|
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
feature,
|
|
wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
|
|
NULL, 0, USB_CTRL_SET_TIMEOUT);
|
|
}
|
|
|
|
|
|
static inline int __wa_set_feature(struct wahc *wa, u16 feature)
|
|
{
|
|
return __wa_feature(wa, 1, feature);
|
|
}
|
|
|
|
|
|
static inline int __wa_clear_feature(struct wahc *wa, u16 feature)
|
|
{
|
|
return __wa_feature(wa, 0, feature);
|
|
}
|
|
|
|
|
|
/**
|
|
* Return the status of a Wire Adapter
|
|
*
|
|
* @wa: Wire Adapter instance
|
|
* @returns < 0 errno code on error, or status bitmap as described
|
|
* in WUSB1.0[8.3.1.6].
|
|
*
|
|
* NOTE: need malloc, some arches don't take USB from the stack
|
|
*/
|
|
static inline
|
|
s32 __wa_get_status(struct wahc *wa)
|
|
{
|
|
s32 result;
|
|
result = usb_control_msg(
|
|
wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
|
|
USB_REQ_GET_STATUS,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
|
|
&wa->status, sizeof(wa->status), USB_CTRL_GET_TIMEOUT);
|
|
if (result >= 0)
|
|
result = wa->status;
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* Waits until the Wire Adapter's status matches @mask/@value
|
|
*
|
|
* @wa: Wire Adapter instance.
|
|
* @returns < 0 errno code on error, otherwise status.
|
|
*
|
|
* Loop until the WAs status matches the mask and value (status & mask
|
|
* == value). Timeout if it doesn't happen.
|
|
*
|
|
* FIXME: is there an official specification on how long status
|
|
* changes can take?
|
|
*/
|
|
static inline s32 __wa_wait_status(struct wahc *wa, u32 mask, u32 value)
|
|
{
|
|
s32 result;
|
|
unsigned loops = 10;
|
|
do {
|
|
msleep(50);
|
|
result = __wa_get_status(wa);
|
|
if ((result & mask) == value)
|
|
break;
|
|
if (loops-- == 0) {
|
|
result = -ETIMEDOUT;
|
|
break;
|
|
}
|
|
} while (result >= 0);
|
|
return result;
|
|
}
|
|
|
|
|
|
/** Command @hwahc to stop, @returns 0 if ok, < 0 errno code on error */
|
|
static inline int __wa_stop(struct wahc *wa)
|
|
{
|
|
int result;
|
|
struct device *dev = &wa->usb_iface->dev;
|
|
|
|
result = __wa_clear_feature(wa, WA_ENABLE);
|
|
if (result < 0 && result != -ENODEV) {
|
|
dev_err(dev, "error commanding HC to stop: %d\n", result);
|
|
goto out;
|
|
}
|
|
result = __wa_wait_status(wa, WA_ENABLE, 0);
|
|
if (result < 0 && result != -ENODEV)
|
|
dev_err(dev, "error waiting for HC to stop: %d\n", result);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
|
|
#endif /* #ifndef __HWAHC_INTERNAL_H__ */
|